Patent Publication Number: US-2021181513-A1

Title: Wearable display device

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a Continuation of PCT International Application No. PCT/JP2019/034114 filed on Aug. 30, 2019, which claims priority under 35 U.S.C. § 119(a) to Japanese Patent Application No. 2018-163451 filed on Aug. 31, 2018. The above application is hereby expressly incorporated by reference, in its entirety, into the present application. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a wearable display device. 
     2. Description of the Related Art 
     In recent years, a wearable display device such as a head-mounted display has been widely used. Such a wearable display device is a device which magnifies a small display or a small displayed image with an enlarging optical system and displays the image at a close distance to the user&#39;s eyes. 
     Such a wearable display device has presence because the wearable display device covers the entire field of view of the viewer with a display (JP2014-068184A), but the surrounding situation cannot be checked because the background cannot be seen, and as a result, there is a possibility of bumping into an object. 
     In addition, there is a wearable display device in which the background can be viewed and an image is projected on the background, but the visible range of the image is limited because the visual angle (field of view: FOV) is narrow. In addition, this wearable display device has a more complicated optical system than the above-described device (US2016/0231568A), which is not easy to use at present. 
     SUMMARY OF THE INVENTION 
     The present invention has been made in consideration of the above-described circumstances, and an object of the present invention is to provide a wearable display device having good background visibility, a wide visual angle capable of viewing projected images, and a simple structure. 
     As a result of intensive studies on the above-described objects, the present inventors found that the desired effects can be obtained by using a predetermined optical element. 
     That is, it was found that the above-described objects can be achieved by the following configurations. 
     [1] A wearable display device comprising at least: 
     a transparent screen; and 
     a projection device which projects an image on the transparent screen, 
     in which a magnifying lens for viewing the image reflected from the transparent screen is disposed on a viewing side to cover at least a part of the transparent screen. 
     [2] The wearable display device according to [1], 
     in which a bisector of an angle between an incoming ray from at least one direction onto the transparent screen and a specularly reflected ray of the incoming ray is inclined by 5° or more with respect to a normal direction to a specular reflection surface of the transparent screen. 
     [3] The wearable display device according to [1] or [2], 
     in which the transparent screen has a cholesteric liquid crystal layer exhibiting selective reflectivity. 
     [4] The wearable display device according to any one of [1] to [3], 
     in which the cholesteric liquid crystal layer further exhibits diffuse reflectivity. 
     [5] The wearable display device according to any one of [1] to [4], further comprising: 
     a light guide plate which guides the image projected by the projection device to the transparent screen. 
     [6] The wearable display device according to [5], 
     in which the transparent screen is disposed on one surface of the light guide plate, and 
     the lens is disposed on the other surface. 
     According to the present invention, it is possible to provide a wearable display device having good background visibility, a wide visual angle capable of viewing projected images, and a simple structure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view schematically showing an example of a wearable display device according to an embodiment of the present invention. 
         FIG. 2  is a cross-sectional view showing a part of the wearable display device shown in  FIG. 1  in an enlarged manner. 
         FIG. 3  is a schematic view illustrating a transparent screen used in the present invention. 
         FIG. 4  is a front view showing a part of the wearable display device shown in  FIG. 1 . 
         FIG. 5  is a cross-sectional view schematically showing another example of the wearable display device according to the embodiment of the present invention. 
         FIG. 6  is a top view schematically showing still another example of the wearable display device according to the embodiment of the present invention. 
         FIG. 7  is a schematic view showing an example of the transparent screen used in the present invention. 
         FIG. 8  is a schematic view of an X-Z plane of a cholesteric liquid crystal layer  20 . 
         FIG. 9  is a schematic view of the X-Z plane of the cholesteric liquid crystal layer  20  in a case of being observed with a scanning electron microscope (SEM). 
         FIG. 10  is a schematic view of an X-Y plane of an inclined cholesteric liquid crystal layer  10 . 
         FIG. 11  is a schematic view of an X-Z plane of the inclined cholesteric liquid crystal layer  10 . 
         FIG. 12  is a schematic view of the X-Z plane of the inclined cholesteric liquid crystal layer  10  in a case of being observed with a scanning electron microscope (SEM). 
         FIG. 13  is a schematic view of an X-Y plane of an inclined cholesteric liquid crystal layer  30 . 
         FIG. 14  is a schematic view of an X-Z plane of the inclined cholesteric liquid crystal layer  30  in a case of being observed with SEM. 
         FIG. 15  is a schematic view of an X-Y plane of an inclined cholesteric liquid crystal layer  40 . 
         FIG. 16  is a schematic view of an X-Z plane of the inclined cholesteric liquid crystal layer  40 . 
         FIG. 17  is a schematic cross-sectional view for explaining an example of an embodiment of a composition layer satisfying Requirement 1 in a step 2-1. 
         FIG. 18  is a schematic cross-sectional view of a laminate  50 . 
         FIG. 19  is a schematic diagram of a graph plotting a relationship between helical twisting power (HTP) (μm −1 )×concentration (mass %) and light irradiation amount (mJ/cm 2 ) in each of a chiral agent A and a chiral agent B. 
         FIG. 20  is a schematic diagram of a graph plotting a relationship between weighted-average helical twisting power (μm −1 ) and light irradiation amount (mJ/cm 2 ) in a system in which the chiral agent A and the chiral agent B are used in combination. 
         FIG. 21  is a schematic diagram of a graph plotting a relationship between HTP (μm −1 )×concentration (mass %) and temperature (° C.) in each of the chiral agent A and the chiral agent B. 
         FIG. 22  is a schematic diagram of a graph plotting a relationship between weighted-average helical twisting power (μm −1 ) and temperature (° C.) in a system in which the chiral agent A and the chiral agent B are used in combination. 
         FIG. 23  is a schematic configuration diagram of an exposure apparatus which irradiates an alignment film with interference light. 
         FIG. 24  is a schematic view of an X-Z plane of a cholesteric liquid crystal layer  28  in a case of being observed with SEM. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     &lt;Wearable Display Device&gt; 
     A wearable display device according to an embodiment of the present invention is a device including at least a transparent screen, and a projection device which projects an image on the transparent screen, in which a lens for viewing the image reflected from the transparent screen is disposed on a viewing side to cover at least a part of the transparent screen, and is a device worn by a viewer on the body and having at least a display function. The wearable display device particularly includes a head-mounted display (HMD) worn on the head of the viewer. 
     Hereinafter, the wearable display device according to the embodiment of the present invention will be described with reference to  FIGS. 1 and 2 . 
       FIG. 1  is a perspective view schematically showing an example of the wearable display device according to the embodiment of the present invention.  FIG. 2  is a cross-sectional view showing a part of the wearable display device shown in  FIG. 1  in an enlarged manner. 
     A wearable display device  80  shown in  FIGS. 1 and 2  includes a frame  82 , a transparent support  84   a , a transparent support  84   b , a light absorbing layer  85 , a transparent screen  86   a , a transparent screen  86   b , a light guide member  88   a , a light guide member  88   b , a projection device  90   a , a projection device  90   b , and a lens  92 . 
     In the following description, in a case where it is not necessary to distinguish between the transparent support  84   a  and the transparent support  84   b , the transparent support  84   a  and the transparent support  84   b  will be described as a transparent support  84 . Similarly, in a case where it is not necessary to distinguish between the transparent screen  86   a  and the transparent screen  86   b , the transparent screen  86   a  and the transparent screen  86   b  will be described as a transparent screen  86 . In a case where it is not necessary to distinguish between the light guide member  88   a  and the light guide member  88   b , the light guide member  88   a  and the light guide member  88   b  will be described as a light guide member  88 . In a case where it is not necessary to distinguish between the projection device  90   a  and the projection device  90   b , the projection device  90   a  and the projection device  90   b  will be described as a projection device  90 . 
     The frame  82  is a portion which supports the transparent support  84   a  and the transparent support  84   b , and is worn on the head of the viewer. In a case of wearing on the head of the viewer, the frame  82  supports the transparent support  84   a  at a position where the transparent support  84   a  covers the visual field of the viewer&#39;s right eye, and supports the transparent support  84   b  at a position where the transparent support  84   b  covers the visual field of the viewer&#39;s left eye. 
     The shape and material of the frame  82  are not particularly limited, and the same shape and material as a frame used in a known wearable display device in the related art can be used. 
     The transparent support  84  has transparency so that the viewer can view the background, and covers at least a part of the visual field of the viewer in a case where the viewer wears the wearable display device  80  on the head. In a case where the viewer wears the wearable display device  80  on the head, the transparent support  84  supports the transparent screen  86  and the lens  92  within the visual field of the viewer. 
     In addition, the transparent support  84  also has a function as a light guide plate which guides the image (light) projected by the projection device  90  to the transparent screen  86 . 
     The transparent screen  86  has transparency so that the viewer can view the background, and reflects at least a part of the light. The transparent screen  86  is disposed on one main surface of the transparent support  84 . In the example shown in  FIG. 1 , the transparent screen  86  is disposed on a main surface of the transparent support  84 , which is an opposite side to the viewer in a case where the viewer wears the wearable display device  80  on the head. In addition, in the example shown in  FIG. 1 , the transparent screen  86  is smaller than the main surface of the transparent support  84 , and covers a part of the main surface. 
     In the following description, a viewer side in a case where the viewer wears the wearable display device  80  on the head is also referred to simply as the viewer side, a side opposite to the viewer is also referred to simply as the opposite side to the viewer. 
     Here, in the transparent screen  86 , it is preferable that a bisector of an angle between an incoming ray from at least one direction onto the transparent screen and a specularly reflected ray of the incoming ray is inclined by 5° or more with respect to a normal direction to a surface of the transparent screen. 
     This point will be described with reference to  FIG. 3 . 
     In a case where light incident from a certain direction onto the transparent screen  86  is defined as I 1  and a reflected light that the incidence light I 1  is reflected by the transparent screen is defined as I 2 , the angle θ x  between a bisector a 2  of an angle between I 1  and I 2 , and a normal direction a 1  to the surface (main surface) of the transparent screen  86  is 5° or more. 
     By using such a transparent screen, an image projected obliquely to the transparent screen can be reflected toward the viewer in a direction perpendicular to the transparent screen. 
     The light guide member  88  guides the image projected by the projection device  90  to the transparent support  84 . In the example shown in  FIG. 1 , the light guide member  88  is a plate-shaped member, a longitudinal direction thereof coincides with a direction substantially perpendicular to the main surface of the transparent support  84 , and an end portion thereof is connected to a side surface of the transparent support  84 . In addition, the projection device  90  is disposed on an end face of the light guide member  88  opposite to the transparent support  84 . 
     As shown in  FIG. 2 , a reflective layer  89  is provided at the end portion of the light guide member  88  on the side connected to the transparent support  84 . The reflective layer  89  reflects light projected by the projection device  90  and guided in the light guide member  88  in the direction of the transparent support  84 , and causes light to enter the transparent support  84 . 
     As a material of the light guide member  88 , the same material as the transparent support  84  can be used. In addition, it is sufficient that the shape, size, and the like of the light guide member  88  are appropriately set according to the size, disposition, and the like of the transparent support  84  and the projection device  90 . 
     As the reflective layer  89 , a known reflective layer in the related art used as a reflective layer, such as a metal vapor deposition film on which a metal such as aluminum is vapor-deposited, can be appropriately used. 
     The projection device  90  is disposed on the end face of the light guide member  88  opposite to the transparent support  84 , and projects an image toward the inside of the light guide member  88 . 
     The lens  92  is disposed on the main surface of the transparent support  84  opposite to the surface on which the transparent screen  86  is disposed. That is, the lens  92  is disposed on the viewing side compared to the transparent screen  86 . The lens  92  is disposed at a position overlapping with the transparent screen  86  in the surface direction of the main surface of the transparent support  84 . That is, in a case of being viewed from the viewer, the lens  92  is disposed so as to cover at least a part of the transparent screen  86 . 
     The lens  92  is an eyepiece lens, and is a magnifying lens which magnifies the image (light) reflected by the transparent screen  86  and forms an image on the eyes of the viewer. 
     The light absorbing layer  85  is provided on an end face of the transparent support  84  opposite to the end face on which the light guide member  88  is disposed (end face on which the image is incident). The light absorbing layer  85  absorbs light, among the light guided in the transparent support  84 , which has reached the end face without being reflected in a front direction by the transparent screen  86 . As a result, it is possible to prevent light from being emitted from the end face of the transparent support  84  to be a hot spot. 
     The operation of the wearable display device  80  having such a configuration will be described with reference to  FIGS. 2 and 4 .  FIG. 2  shows only the members disposed on the right eye side of the viewer, but the same operation is exerted on the members disposed on the left eye side. In addition, in  FIG. 2 , the upper side is the viewer side. 
     In a case where an image is projected by the projection device  90   a , the image is guided in the light guide member  88   a  and reflected by the reflective layer  89  in the light guide member  88   a . The image reflected by the reflective layer  89  is guided in the transparent support  84   a  while being totally reflected at an interface (main surface) of the transparent support  84   a . At least a part of the image guided in the transparent support  84   a  is incident on the transparent screen  86   a  and reflected in the direction of the viewer (upward in the figure). The image reflected by the transparent screen  86   a  passes through the transparent support  84   a  and is incident on the lens  92 . The image incident on the lens  92  is imaged in the eye of the viewer. As a result, the viewer views the image projected on the transparent screen  86   a . In addition, among the images guided in the transparent support  84 , images not reflected in the front direction by the transparent screen  86  reach the light absorbing layer  85  on the end face and are absorbed. 
     In a case where the image is projected on the transparent screen  86  in this way, as shown in  FIG. 4 , the projected image is viewed in an area where the transparent screen  86  is disposed, and the background is viewed in an area of the transparent support  84 , where the transparent screen  86  is not disposed. As a result, the wearable display device  80  can display the image overlapped with the background. Here, in the wearable display device  80  according to the embodiment of the present invention, the viewer views the image through the lens  92 . In a case of displaying an image using a transparent screen or the like in an AR glasses in the related art, since the image light reflected by the transparent screen is almost parallel light, the visual angle is narrowed. On the other hand, in the present invention, since the diffused image light is magnified by the lens  92 , it is possible to widen the visual angle at which the image can be viewed. In addition, since the transparent screen  86  is used in the wearable display device  80 , the background can be viewed in the area where the image is not projected. In addition, as described above, in the wearable display device  80 , the above-described effects can be achieved with a simple structure. 
     Here, in the example shown in  FIG. 1 , the transparent screen  86  is smaller than the main surface of the transparent support  84 , but the present invention is not limited thereto. The transparent screen  86  may have the same size as the main surface of the transparent support  84  to cover the entire main surface of the transparent support  84 . 
     In addition, in the example shown in  FIG. 2 , the image is reflected on the entire surface of the transparent screen  86 , but the present invention is not limited thereto. A part of the transparent screen  86  may reflect the image. In this case, it is sufficient that the lens  92  is disposed so as to correspond to an area where the transparent screen  86  reflects the image. That is, it is sufficient that, in the surface direction of the main surface of the transparent support  84 , the lens  92  is disposed at a position overlapping the area where the transparent screen  86  reflects the image. 
     In addition, in the example shown in  FIG. 1 , the wearable display device has a configuration having the light guide member  88  which guides the image projected by the projection device  90  to the transparent support  84  (light guide plate), but the present invention is not limited thereto. The projection device  90  may project the image directly into the transparent support  84 . 
     In addition, in the example shown in  FIG. 1 , the wearable display device has a configuration having the transparent support  84 , transparent screen  86 , projection device  90 , lens  92 , and the like for each of the right eye and the left eye of the viewer, but the present invention may have a configuration having these for only right eye or left eye. 
     In addition, in the example shown in  FIG. 1 , the wearable display device has a configuration respectively having the transparent supports  84  for the right eye and the left eye of the viewer, but the transparent supports for the right eye and the left eye may be integrally formed. That is, one transparent support may have a size which covers the visual field of the right eye and the visual field of the left eye of the viewer. In a case of such a configuration having one transparent support, a transparent screen and lens for the right eye and a transparent screen and lens for the left eye may be provided on the one transparent support, respectively. 
     In addition, in the example shown in  FIG. 2 , the wearable display device has a configuration in which the transparent screen  86  and the lens  92  are provided on one transparent support  84 , but the present invention is not limited thereto. 
     For example, as shown in  FIG. 5 , the wearable display device may have a configuration in which the wearable display device has a transparent support  84  and a transparent support  94 , the transparent support  84  and transparent support  94  having main surfaces substantially parallel to each other are supported by a frame  82 , and the transparent screen  86  is provided on the main surface of the transparent support  84  and the lens  92  is provided on the main surface of the transparent support  94 . 
     In addition, in the example shown in  FIG. 1 , the wearable display device has a configuration in which the transparent screen  86  and the lens  92  are provided on the transparent support  84 , but the present invention is not limited thereto. The transparent screen  86  and/or the lens  92  may be directly supported by the frame. 
     In addition, in the example shown in  FIG. 2 , the image projected by the projection device  90  is guided by the transparent support  84  and guided to the transparent screen  86 , but the present invention is not limited thereto. 
     For example, as shown in  FIG. 6 , the image from the projection device  90  may be directly projected on the transparent screen  86 . In the example shown in  FIG. 6 , the wearable display device has a configuration in which the transparent screen  86  is provided on the main surface of the transparent support  84 , and the lens  92  is provided on the main surface of the transparent support  94 , and the projection device  90  projects an image from an oblique direction to the transparent screen  86 . In a case of such a configuration, the image projected by the projection device  90  to the transparent screen  86  is reflected by the transparent screen  86 . The transparent screen  86  reflects the projected image in the direction of the lens  92 . The reflected image is imaged by the lens  92  in the eyes of the viewer. 
     In a case of the configuration in which the image is directly projected by the projection device to the transparent screen, images not reflected by the transparent screen may pass through the transparent screen. From this point, it is preferable that the wearable display device has a light guide plate (transparent support) and the light guide plate guides the image projected by the projection device to the transparent screen. 
     Hereinafter, the configuration of each component will be described in detail. 
     &lt;Transparent Screen&gt; 
     In the present invention, it is preferable that the transparent screen has transparency so that the viewer can view the background, has a transparent member such as an acrylic plate as a base material, and further has a transparent light-reflecting member for reflecting an image projected on the transparent member. 
     In the present invention, it is preferable that the transparent light-reflecting member preferably included in the transparent screen has a flat surface having no uneven shape on the surface, particularly has a cholesteric liquid crystal layer exhibiting selective reflectivity, selectively reflects any one of right-handed or left-handed circular polarization, and particularly has a selective reflection wavelength of each of blue (B), green (G), and red (R). 
     In addition, in the above-described transparent screen, in order to reflect the image obliquely projected to the front toward the viewer, a bisector of an angle between an incoming ray from at least one direction onto the above-described transparent screen and a specularly reflected ray of the incoming ray is preferably inclined by 5° or more, more preferably inclined by 15° to 75°, and most preferably inclined by 30° to 60° with respect to a normal direction to the main surface of the transparent screen. As a method for realizing the inclination, the helical axis of the cholesteric liquid crystal layer is inclined evenly in at least one direction. 
     Hereinafter, in the transparent screen, the angle between a normal line of a surface (reflecting surface) where incoming ray is specularly reflected and a normal line of the surface of the transparent screen is also referred to as an “inclination angle of the reflecting surface”. 
     The inclination angle may be the same for the above-described light-reflecting members for the right eye and the left eye, but it is preferable that the inclination angles are different depending on the angle of the projected light from the projection device. In a case where projection devices for the right eye and the left eye are provided independently, the wearable display device can be used for, for example, stereoscopic display. 
     In addition, in order to widen the visual angle, it is preferable that the transparent light-reflecting member of the transparent screen described above exhibits a diffuse reflectivity. As a method for realizing this, the helical axis of the cholesteric liquid crystal layer fluctuates within a certain range. 
     Therefore, as a cholesteric liquid crystal layer preferably used in the transparent light-reflecting member of the transparent screen described above, it is most preferable that the helical axis thereof is inclined evenly at least one direction and fluctuates within a certain range. 
     As the transparent screen, it is preferable to use a transparent screen (hereinafter, referred to as an inclined cholesteric-type transparent screen) having, as the light-reflecting member, a cholesteric liquid crystal layer in which the helical axis is inclined evenly in at least one direction, a sheet-shaped transparent screen (hereinafter, referred to as a linear Fresnel lens-type transparent screen) which has an uneven surface in a shape of a linear Fresnel lens and has a reflector on an inclined surface of the linear Fresnel lens, and in which a surface of the reflector opposite to the inclined surface is covered with a resin and is flattened, or the like. 
     Hereinafter, specific configurations of the transparent screen will be described. 
     (Linear Fresnel Lens-Type Transparent Screen) 
       FIG. 7  is a view schematically showing an example of the transparent screen used in the display according to the embodiment of the present invention. 
     A transparent screen  200  shown in  FIG. 7  includes a transparent base material  202 , a reflector  204 , and a resin layer  206 . 
     The transparent base material  202  is a transparent member having an uneven surface in a shape of a linear Fresnel lens. The material of the transparent base material  202  is not particularly limited as long as it has transparency, and examples thereof include resins such as acrylic resin, and glass. 
     The surface (surface opposite to the reflector  204 ) of the transparent base material  202  is flat. 
     The reflector  204  is a member having transparency and light reflectivity to at least a part of light. The reflector  204  is disposed on the inclined surface of the uneven surface of the transparent base material  202 . 
     As the reflector  204 , a dielectric multilayer film, a metal thin film, or a cholesteric liquid crystal layer which reflects right-handed or left-handed circular polarization of light having a predetermined wavelength and transmits light having other wavelength range and the other circular polarization, that is, which has wavelength-selective reflectivity and circular polarization-selective reflectivity is suitably used. 
     As is well known, the cholesteric liquid crystal layer is a layer obtained by immobilizing a cholesteric liquid crystalline phase formed by cholesteric alignment of a liquid crystal compound. In the cholesteric liquid crystal layer of the present invention, it is sufficient that the optical properties of the cholesteric liquid crystalline phase are retained in the layer, and the liquid crystal compound in the layer may not exhibit liquid crystallinity. The same applies to the inclined cholesteric liquid crystal layer described later. 
     In a cholesteric liquid crystal layer  20  shown in  FIG. 8 , a helical axis C 2  derived from the cholesteric liquid crystalline phase is perpendicular to a main plane of the cholesteric liquid crystal layer  20 , and a reflecting plane T 2  is a plane parallel to the main plane. 
     As shown in  FIG. 9 , in a case where an X-Z plane of the cholesteric liquid crystal layer  20  is observed with a scanning electron microscope (SEM), an array direction P 2  in which a bright portion  25  and a dark portion  26  are arrayed alternately is perpendicular to the main plane. 
     Since the cholesteric liquid crystalline phase shown in  FIG. 9  has specular reflectivity, for example, in a case where light is incident on the cholesteric liquid crystal layer  20  from an oblique direction, the light is reflected diagonally at the same reflection angle as the incidence angle (see arrows in  FIG. 8 ). 
     The resin layer  206  is a transparent layer which covers the surface of the reflector  204  opposite to the transparent base material  202  and covers the surface of the transparent base material  202 . The material of the resin layer  206  is not particularly limited as long as it has transparency, and examples thereof include resins such as acrylic resin. 
     The surface (surface opposite to the reflector  204 ) of the resin layer  206  is flat. 
     In the transparent screen  200  having such a configuration, since the reflector  204  is inclined with respect to the main surface of the transparent screen  200 , the inclination angle of the reflecting plane can be set to 5° or more. That is, by appropriately setting the angle of the inclined surface of the transparent base material  202 , on which the reflector  204  is disposed, it is possible to appropriately set the inclination angle of the reflecting plane of the transparent screen  200 . 
     (Inclined Cholesteric-Type Transparent Screen) 
     The inclined cholesteric liquid crystal layer included in the inclined cholesteric-type transparent screen will be described with reference to  FIGS. 10 to 12 . 
     &lt;&lt;Liquid Crystal Alignment Pattern&gt;&gt; 
       FIGS. 10 and 11  show a schematic view conceptually showing the alignment state of the liquid crystal compound in the inclined cholesteric liquid crystal layer. 
       FIG. 10  is a schematic view showing, in an inclined cholesteric liquid crystal layer  10  having a main plane  13  of a pair of a main plane  11  and a main plane  12 , an in-plane alignment state of the liquid crystal compound in the main plane  11  and the main plane  12 . In addition,  FIG. 11  is a schematic cross-sectional view showing a state of the cholesteric liquid crystalline phase in the cross section perpendicular to the main plane  11  and the main plane  12 . In the following, the main plane  11  and main plane  12  of the inclined cholesteric liquid crystal layer  10  will be described as an X-Y plane, and a cross section perpendicular to the X-Y plane will be described as an X-Z plane. That is,  FIG. 10  corresponds to a schematic view of the X-Y plane of the inclined cholesteric liquid crystal layer  10 , and  FIG. 11  corresponds to a schematic view of the X-Z plane of the inclined cholesteric liquid crystal layer  10 . 
     Hereinafter, an aspect in which a rod-like liquid crystal compound is used as the liquid crystal compound will be described as an example. 
     As shown in  FIG. 10 , in the X-Y plane of the inclined cholesteric liquid crystal layer  10 , a liquid crystal compound  14  is arrayed along a plurality of array axes D 1  parallel to each X-Y plane, and in each of the array axes D 1 , an orientation of a molecular axis L 1  of the liquid crystal compound  14  has a liquid crystal alignment pattern which changes consecutively while rotating over one direction in the plane along the array axis D 1 . Here, for convenience of description, it is assumed that the array axis D 1  is aligned in the X direction. In addition, in the Y direction, the liquid crystal compounds  14  having the same orientation of the molecular axis L 1  are aligned at regular intervals. 
     The “orientation of a molecular axis L 1  of the liquid crystal compound  14  has a liquid crystal alignment pattern which changes consecutively while rotating over one direction in the plane along the array axis D 1 ″ means that the angle between the molecular axis L 1  of the liquid crystal compound  14  and the array axis D 1  is different depending on the position in the array axis D 1  direction, and the angle between the molecular axis L 1  and the array axis D 1  gradually changes from θ 1  to θ 1 +180° or θ 1 −180° along the array axis D 1 . That is, as shown in  FIG. 10 , in the plurality of liquid crystal compounds  14  arrayed along the array axis D 1 , the molecular axis L 1  changes while rotating along the array axis D 1  by a constant angle. 
     In addition, in the present specification, in a case where the liquid crystal compound  14  is a rod-like liquid crystal compound, the molecular axis L 1  of the liquid crystal compound  14  means a molecular major axis of the rod-like liquid crystal compound. On the other hand, in a case where the liquid crystal compound  14  is a disk-like liquid crystal compound, the molecular axis L 1  of the liquid crystal compound  14  means an axis parallel to the normal direction to the disk-like liquid crystal compound with respect to the disk plane. 
       FIG. 11  shows a schematic view of the X-Z plane of the inclined cholesteric liquid crystal layer  10 . 
     In the X-Z plane of the inclined cholesteric liquid crystal layer  10  shown in  FIG. 11 , the molecular axis L 1  of the liquid crystal compound  14  is inclined and aligned with respect to the main plane  11  and main plane  12  (X-Y plane). 
     An average angle (average tilt angle) θ 3  between the molecular axis L 1  of the liquid crystal compound  14  and the main plane  11  and main plane  12  (X-Y plane) is preferably 5° to 45° and more preferably 12° to 22°. The angle θ 3  can be measured by observing the X-Z plane of the inclined cholesteric liquid crystal layer  10  with a polarizing microscope. Among these, in the X-Z plane of the inclined cholesteric liquid crystal layer  10 , it is preferable that the molecular axis L 1  of the liquid crystal compound  14  is inclined and aligned in the same direction with respect to the main plane  11  and main plane  12  (X-Y plane). 
     The above-described average angle is a value obtained by measuring, in the polarizing microscope observation of the cross section of the cholesteric liquid crystal layer, the angle between the molecular axis L 1  of the liquid crystal compound  14  and the main plane  11  and main plane  12  at any five or more points, and arithmetically averaging these values. 
     Since the molecular axis L 1  is aligned as described above, as shown in  FIG. 11 , in the inclined cholesteric liquid crystal layer  10 , a helical axis C 1  derived from the cholesteric liquid crystalline phase is inclined at a predetermined angle with respect to the main plane  11  and main plane  12  (X-Y plane). That is, a reflecting plane T 1  (plane on which a liquid crystal compound that is orthogonal to the helical axis C 1  and has the same azimuthal angle exists) of the inclined cholesteric liquid crystal layer  10  is inclined in a substantially constant direction with respect to the main plane  11  and main plane  12  (X-Y plane). 
     The “liquid crystal molecules having the same azimuthal angle” refer to liquid crystal molecules having the same alignment direction of the molecular axes in a case of being projected onto the main plane  11  and main plane  12  (X-Y plane). 
     In a case where the X-Z plane of the inclined cholesteric liquid crystal layer  10  shown in  FIG. 11  is observed with SEM, it is observed that a streak pattern that an array direction P 1  in which a bright portion  15  and a dark portion  16  are arrayed alternately as shown in  FIG. 12  is inclined at a predetermined angle θ 2  with respect to the main plane  11  and main plane  12  (X-Y plane). In  FIG. 12 , two bright portions  15  and two dark portions  16  correspond to one pitch of the helix (one winding number of the helix). 
     In the inclined cholesteric liquid crystal layer  10 , the molecular axis L 1  of the liquid crystal compound  14  is substantially orthogonal to the array direction P 1  in which a bright portion  15  and a dark portion  16  are arrayed alternately. 
     The angle between the molecular axis L 1  and the array direction P 1  is preferably 80° to 90° and more preferably 85° to 90°. 
     Hereinafter, the reason why the reflection anisotropy of the inclined cholesteric liquid crystal layer  10  can be obtained will be described. 
     &lt;&lt;Reflection Anisotropy&gt;&gt; 
     Since the reflecting plane T 1  is inclined in a predetermined direction with respect to the main plane  11  and the main plane  12  (X-Y plane), the inclined cholesteric liquid crystal layer  10  shown in  FIGS. 10 and 11  has reflected light anisotropy. For example, in a case where light is incident on the inclined cholesteric liquid crystal layer  10  from an oblique direction, the light is reflected by the reflecting plane T 1  in the normal direction to the main plane  11  and main plane  12  (X-Y plane) (see arrows in  FIG. 11 ). 
     &lt;&lt;Cholesteric Liquid Crystalline Phase&gt;&gt; 
     It is known that the cholesteric liquid crystalline phase exhibits selective reflectivity at a specific wavelength. The center wavelength λ of selective reflection (selective reflection center wavelength) depends on a pitch P (=helical period) of a helical structure in the cholesteric liquid crystalline phase and satisfies a relationship of X=n×P with an average refractive index n of the cholesteric liquid crystalline phase. Therefore, the selective reflection center wavelength can be adjusted by adjusting the pitch of the helical structure. The pitch of the cholesteric liquid crystalline phase depends on the type of chiral agent used together with the liquid crystal compound, or the concentration thereof added in a case of forming an optically anisotropic layer, a desired pitch can be obtained by adjusting these. 
     Regarding the adjustment of the pitch, detailed description can be found in FUJIFILM Research Report No. 50 (2005), pp. 60 to 63. Regarding a method for measuring a sense and the pitch of the helix, it is possible to use the method described on page 46 of “Liquid Crystal Chemical Experiment Introduction” edited by Japan Liquid Crystal Society, published by Sigma Corporation in 2007, and page 196 of “Liquid Crystal Handbook” Liquid Crystal Handbook Editing Committee, Maruzen Publishing Co., Ltd. 
     The cholesteric liquid crystalline phase exhibits selective reflectivity with respect to left-handed or right-handed circular polarization at a specific wavelength. Whether or not the reflected light is right-handed circular polarization or left-handed circular polarization is determined depending on a helically twisted direction (sense) of the cholesteric liquid crystalline phase. Regarding the selective reflection of the circular polarization by the cholesteric liquid crystalline phase, in a case where the helically twisted direction of the cholesteric liquid crystalline phase is right, right-handed circular polarization is reflected, and in a case where the helically twisted direction of the cholesteric liquid crystalline phase is left, left-handed circular polarization is reflected. 
     The direction of revolution of the cholesteric liquid crystalline phase can be adjusted by the type of liquid crystal compound forming the optically anisotropic layer and/or the type of chiral agent added. 
     In addition, a half-width Δλ (nm) of a selective reflection range (circular polarization reflection range) where selective reflection is exhibited depends on Δn of the cholesteric liquid crystalline phase and the helical pitch P and complies with a relationship of Δλ=Δn×P. Therefore, the width of the selective reflection range can be controlled by adjusting Δn. Δn can be adjusted by the type of liquid crystal compound forming an (inclined) cholesteric liquid crystal layer and mixing ratio thereof, and the temperature during immobilizing the alignment. 
     The half-width of the reflection wavelength range is adjusted according to the use of the (inclined) cholesteric liquid crystal layer, and for example, may be 10 to 500 nm, preferably 20 to 300 nm, and more preferably 30 to 100 nm. 
     Here, in the example shown in  FIG. 12 , the inclined cholesteric liquid crystal layer  10  has a configuration in which the bright portion  15  and the dark portion  16  are linear, but the present invention is not limited thereto. As an inclined cholesteric liquid crystal layer  30  shown in  FIG. 14 , the shape of the bright-dark line consisting of a bright portion  35  and a dark portion  36  derived from the cholesteric liquid crystalline phase, which is observed in the X-Z plane with SEM, may be wavy (flapping structure). 
     As described above, in the cholesteric liquid crystal layer, a surface parallel to the bright portion and the dark portion is the reflecting plane. Therefore, in a case where the shape of the bright portion and the dark portion derived from the cholesteric liquid crystalline phase is wavy, the reflecting plane of the inclined cholesteric liquid crystal layer is wavy. Accordingly, the reflection angle of the reflected light on the inclined cholesteric liquid crystal layer  30  varies depending on the position, and as a result, light diffusivity is obtained. 
     In the inclined cholesteric liquid crystal layer  30 , the “shape of the bright-dark line consisting of a bright portion  35  and a dark portion  36  derived from the cholesteric liquid crystalline phase is wavy (flapping structure)” means a layer having a structure in which the angle between the helical axis and the surface of the inclined cholesteric liquid crystal layer changes periodically. In other words, the inclined cholesteric liquid crystal layer  30  is a layer in which the angle between a normal line of the line formed by the dark portion in the cross-sectional view observed by SEM and the surface of the cholesteric liquid crystal layer changes periodically. 
     The flapping structure preferably has the following configuration. 
     A point where one end portion of the dark portion intersects the main plane or side plane of the cholesteric liquid crystal layer is defined as a1, a point where the other end portion of the dark portion intersects the main plane or side plane of the cholesteric liquid crystal layer is defined as a2, and a line segment consisting of the points a1 and a2 is defined as a reference line. In the flapping structure, in a case where the angle between the tangential line at a certain point in the dark portion and this reference line is defined as the inclination angle of the dark portion, the amount of fluctuation of the inclination angle in the line formed by the dark portion is 5° or more. 
     As an example, as shown in  FIG. 13 , the inclined cholesteric liquid crystal layer  30  in which the bright portion  35  and the dark portion  36  are wavy in this way is easily formed by aligning the array of a molecular axis L 3  of a liquid crystal compound  34  in one main plane  31  to face a certain direction in the plane. 
     The array of the molecular axis L 3  of the liquid crystal compound  34  in the other main plane  32  has the same alignment as the X-Y plane of the inclined cholesteric liquid crystal layer  10  shown in  FIG. 10 . In addition, an X-Z plane of the inclined cholesteric liquid crystal layer  30  has the same alignment as the X-Z plane of the inclined cholesteric liquid crystal layer  10 . That is, in the inclined cholesteric liquid crystal layer  30 , the molecular axis L 3  of the liquid crystal compound  34  is inclined and aligned in a predetermined direction with respect to the main plane  31  and main plane  32  (X-Y plane), and the helical axis derived from the cholesteric liquid crystalline phase is inclined at a predetermined angle with respect to the main plane  31  and main plane  32  (X-Y plane). 
     Alternatively, the inclined cholesteric liquid crystal layer  30  in which the bright portion  35  and the dark portion  36  are wavy in this way can be formed by varying one period A that is a length in the liquid crystal alignment pattern described later, in which the orientation of the molecular axis of the liquid crystal compound rotates 180°, along the array axis. 
     Alternatively, as another method, a method of adding a surfactant to a liquid crystal composition for forming a cholesteric liquid crystal layer is also used. 
     Meanwhile, as described above, in the X-Z plane of the inclined cholesteric liquid crystal layer  10 , the molecular axis L 1  of the liquid crystal compound  14  is inclined and aligned with respect to the main plane  11  and main plane  12  (X-Y plane), and in the main plane  11  and main plane  12  (X-Y plane), the orientation of the molecular axis L 1  of the liquid crystal compound  14  changes consecutively while rotating over one direction in the plane along the array axis D 1 . According to this configuration of the inclined cholesteric liquid crystal layer  10 , it is assumed that the bright-dark line consisting of the bright portion and the dark portion derived from the cholesteric liquid crystalline phase, which is observed in the X-Z plane with SEM, exhibits high linearity. As a result, the inclined cholesteric liquid crystal layer  10  has low haze and high transparency. 
     Here, the example of the inclined cholesteric liquid crystal layer  10  shown in  FIG. 11  has a configuration in which the molecular axis of the liquid crystal compound  14  is inclined with respect to the main plane  13  of the inclined cholesteric liquid crystal layer  10 , but the present invention is not limited thereto. The molecular axis of the liquid crystal compound may be parallel to the main plane of the inclined cholesteric liquid crystal layer. 
       FIGS. 15 and 16  show schematic views of another example of the inclined cholesteric liquid crystal layer used in the present invention. Specifically,  FIG. 15  is a schematic view conceptually showing, in an inclined cholesteric liquid crystal layer  40  having a main plane  43  of a pair of a main plane  41  and a main plane  42 , an alignment state of the liquid crystal compound in the main plane  41  and the main plane  42 . In addition,  FIG. 16  shows a state of the inclined cholesteric liquid crystal layer in a cross section perpendicular to the main plane  43  of the inclined cholesteric liquid crystal layer  40 . In the following, the main plane  41  and main plane  42  of the inclined cholesteric liquid crystal layer  40  will be described as an X-Y plane, and a cross section perpendicular to the X-Y plane will be described as an X-Z plane. That is,  FIG. 15  is a schematic view of the X-Y plane of the inclined cholesteric liquid crystal layer  40 , and  FIG. 16  is a schematic view of the X-Z plane of the inclined cholesteric liquid crystal layer  40 . 
     As shown in  FIG. 15 , in the X-Y plane of the inclined cholesteric liquid crystal layer  40 , a liquid crystal compound  44  is arrayed along a plurality of array axes D 2  parallel to each X-Y plane, and in each of the array axes D 2 , an orientation of a molecular axis L 4  of the liquid crystal compound  44  changes consecutively while rotating over one direction in the plane along the array axis D 2 . That is, the alignment state of the liquid crystal compound  44  in the X-Y plane of the inclined cholesteric liquid crystal layer  40  is the same as the alignment state of the liquid crystal compound  14  in the X-Y plane of the inclined cholesteric liquid crystal layer  10  shown in  FIG. 10 . 
     As shown in  FIG. 16 , in the X-Z plane of the inclined cholesteric liquid crystal layer  40 , the molecular axis L 4  of the liquid crystal compound  44  is not inclined with respect to the main plane  41  and main plane  42  (X-Y plane). In other words, the molecular axis L 4  is parallel to the main plane  41  and main plane  42  (X-Y plane). 
     Since the inclined cholesteric liquid crystal layer  40  has the above-described X-Y plane shown in  FIG. 15  and X-Z plane shown in  FIG. 16 , a helical axis C 3  derived from the cholesteric liquid crystalline phase is perpendicular to the main plane  41  and main plane  42  (X-Y plane), and a reflecting plane T 3  thereof is inclined in a predetermined direction with respect to the main plane  41  and main plane  42  (X-Y plane). In a case where the X-Z plane of the above-described inclined cholesteric liquid crystal layer  40  is observed with SEM, it is observed that a streak pattern that an array direction in which a bright portion and a dark portion are arrayed alternately is inclined at a predetermined angle with respect to the main plane  41  and main plane  42  (X-Y plane) (same as that of  FIG. 12 ). 
     As described above, in the inclined cholesteric liquid crystal layer, the molecular axis of the liquid crystal compound may be parallel to the main plane of the inclined cholesteric liquid crystal layer. 
     In the inclined cholesteric liquid crystal layer  10  shown in  FIGS. 10 and 11 , the molecular axis L 1  is substantially orthogonal to the array direction P 1  in which the bright portion  15  and the dark portion  16 , which are observed in the X-Z plane with SEM, are arrayed alternately. That is, the direction of the helical axis C 1  is substantially parallel to the array direction P 1  in which the bright portion  15  and the dark portion  16  are arrayed alternately. As a result, light incident from an oblique direction tends to be more parallel to the helical axis C 1 , and the reflected light on the reflecting plane has a high degree of circular polarization. On the other hand, in a case of the inclined cholesteric liquid crystal layer  40 , since the helical axis C 3  is perpendicular to the main plane  41  and main plane  42  (X-Y plane), an angle between an incident direction of light incident from an oblique direction and the direction of the helical axis C 3  is larger. That is, the incident direction of the light incident from an oblique direction is more nonparallel to the direction of the helical axis C 3 . Therefore, in a case of comparing the inclined cholesteric liquid crystal layer  10  with the inclined cholesteric liquid crystal layer  40 , the reflected light on the reflecting plane has a higher degree of circular polarization. 
     Here, in both main planes  11  and  12  of the inclined cholesteric liquid crystal layer  10  shown in  FIGS. 10 and 11 , the orientation of the molecular axis L 1  of the liquid crystal compound  14  changes consecutively while rotating over one direction in the plane along the array axis D 1 , but on only one main plane, the orientation of the molecular axis of the liquid crystal compound may change consecutively while rotating over one direction in the plane along the array axis. 
     In addition, in the inclined cholesteric liquid crystal layer, it is preferable that an array axis existing on one main plane and an array axis existing on the other main plane are parallel to each other. 
     In addition, in the inclined cholesteric liquid crystal layer, areas where intervals of lines (bright lines) formed by bright portions derived from the cholesteric liquid crystalline phase, which are observed in the X-Z plane with SEM, are different from each other may exist more than once. As described above, two bright portions and two dark portions correspond to one pitch of the helix. That is, in each area where intervals of bright lines formed by bright portions derived from the cholesteric liquid crystalline phase are different from each other, since the helical pitch is different for each area, the center wavelength A. of selective reflection is also different. By forming the inclined cholesteric liquid crystal layer of the above-described aspect, the reflection wavelength range can be further widened. 
     Specific examples of this aspect include an aspect in which the cholesteric liquid crystal layer has an area A R  having a center wavelength of selective reflection in the red light wavelength range, an area A G  having a center wavelength of selective reflection in the green light wavelength range, and an area A B  having a center wavelength of selective reflection in the blue light wavelength range. The area A R , area A G , and area A B  can be formed by mask exposure (patterned exposure) which is performed by irradiating light from an oblique direction with respect to the main plane (preferably, performed by irradiating light from a direction substantially parallel to the array direction). In particular, the inclined cholesteric liquid crystal layer preferably has an area where the helical pitch consecutively changes in any direction in the plane of the main plane. Specifically, it is preferable that the area A R , the area A G , and the area A B  are disposed consecutively in any direction in the plane of the main plane. In this case, the inclined cholesteric liquid crystal layer has areas where intervals of lines formed by bright portions derived from the cholesteric liquid crystalline phase, which are observed in the X-Z plane with SEM, consecutively change. 
     In the above, an aspect in which the inclined cholesteric liquid crystal layer  10  has the area A R , the area A G , and the area A B  has been described, but the present invention is not limited thereto. The inclined cholesteric liquid crystal layer may have two or more areas having different selective reflection wavelengths. In addition, the center wavelength of selective reflection may be infrared or ultraviolet. 
     The above-described one period A corresponds to the interval of the bright-dark line in the reflection polarizing microscope observation. Therefore, it is sufficient that the coefficient (standard deviation/mean value) of variation of the one period A is calculated by measuring the interval of the bright-dark line in the reflection polarizing microscope observation at 10 points on both main planes of the inclined cholesteric liquid crystal layer. 
     &lt;&lt;Method for Manufacturing Inclined Cholesteric Liquid Crystal Layer&gt;&gt; 
     Examples of a manufacturing method for manufacturing the inclined cholesteric liquid crystal layer used in the present invention include a method of using a predetermined liquid crystal layer as an alignment substrate of the inclined cholesteric liquid crystal layer, and using a liquid crystal composition including a chiral agent X in which helical twisting power (HTP) changes due to irradiation with light or including a chiral agent Y in which the helical twisting power changes due to change in temperature. 
     Hereinafter, the method for manufacturing the inclined cholesteric liquid crystal layer will be described in detail. 
     One embodiment of the method for manufacturing the inclined cholesteric liquid crystal layer has the following step 1 and the following step 2: 
     a step 1 of forming, using a composition including a disk-like liquid crystal compound, a liquid crystal layer in which, in at least one surface, a molecular axis of the disk-like liquid crystal compound is inclined with respect to the surface; and 
     a step 2 of forming an inclined cholesteric liquid crystal layer on the liquid crystal layer using a composition including a liquid crystal compound. 
     Hereinafter, the steps  1  and  2  will be described in detail by exemplifying the above-described inclined cholesteric liquid crystal layer  10  as an example. 
     [Step 1] 
     The step 1 is a step of forming a liquid crystal layer using a composition including a disk-like liquid crystal compound. 
     In at least one surface of the liquid crystal layer, the molecular axis of the disk-like liquid crystal compound is inclined with respect to the surface. In other words, in at least one surface of the liquid crystal layer, the disk-like liquid crystal compound is aligned such that the molecular axis thereof is inclined with respect to the surface. In the present manufacturing method, the inclined cholesteric liquid crystal layer is formed on a surface (hereinafter, also referred to as an “inclined alignment surface”) of the liquid crystal layer, in which the disk-like liquid crystal compound is inclined and aligned. 
     The specific method of the step 1 is not particularly limited, and it is preferable to include the following step 1-1 and the following step 1-2. In the following, as a method of inclining and aligning the disk-like liquid crystal compound, a method (step 1-1) of forming a composition layer using a substrate in which a rubbing alignment film having a pretilt angle is disposed on a surface will be shown, but the method of inclining and aligning the disk-like liquid crystal compound is not limited thereto. For example, the method of inclining and aligning the disk-like liquid crystal compound may be a method (for example, the following step 1-1′) of adding a surfactant to a composition for forming a liquid crystal layer. In this case, in the step 1, the following step 1-1′ may be performed instead of the step 1-1. 
     Step 1-1′: step of forming a composition layer on a substrate (a rubbing alignment film may not be disposed on the surface) using a composition including a disk-like liquid crystal compound and a surfactant 
     In addition, in a case where the disk-like liquid crystal compound has a polymerizable group, in the step 1, it is preferable that a curing treatment is performed on the composition layer as described later. 
     Step 1-1: step of forming, using a composition (composition for forming a liquid crystal layer) including a disk-like liquid crystal compound, a composition layer on a substrate in which a rubbing alignment film having a pretilt angle is disposed on a surface 
     Step 1-2: Step of Aligning the Disk-Like Crystal Compound in the Composition Layer 
     The step 1 will be described below. 
     &lt;&lt;Substrate&gt;&gt; 
     The substrate is a plate supporting the composition layer described later. Among these, a transparent substrate is preferable. The transparent substrate is intended to be a substrate in which the transmittance of visible light is 60% or more, and the transmittance is preferably 80% or more and more preferably 90% or more. 
     The material constituting the substrate is not particularly limited, and examples thereof include a cellulose-based polymer, a polycarbonate-based polymer, a polyester-based polymer, a (meth)acrylic polymer, a styrene-based polymer, a polyolefin-based polymer, a vinyl chloride-based polymer, an amide-based polymer, an imide-based polymer, a sulfone-based polymer, a polyethersulfone-based polymer, and a polyetheretherketone-based polymer. 
     The substrate may include various additives such as an ultraviolet (UV) absorber, matting fine particles, a plasticizer, a deterioration inhibitor, and a release agent. 
     The substrate preferably has low birefringence in the visible light region. For example, the phase difference of the substrate at a wavelength of 550 nm is preferably 50 nm or less and more preferably 20 nm or less. 
     The thickness of the substrate is not particularly limited, but from the viewpoint of thinning and handleability, is preferably 10 to 200 μm and more preferably 20 to 100 μm. 
     The thickness means an average thickness, and is obtained by measuring thicknesses at any 5 points on the substrate and arithmetically averaging these values. The method of measuring this thickness is also applied to the thickness of the liquid crystal layer and thickness of the inclined cholesteric liquid crystal layer described later. 
     The type of the rubbing alignment film having a pretilt angle is not particularly limited, and for example, a polyvinyl alcohol alignment film, a polyimide alignment film, or the like can be used. 
     &lt;&lt;Composition for Forming a Liquid Crystal Layer&gt;&gt; 
     Hereinafter, the composition for forming a liquid crystal layer will be described. 
     (Disk-Like Liquid Crystal Compound) 
     The composition for forming a liquid crystal layer includes a disk-like liquid crystal compound. 
     The disk-like liquid crystal compound is not particularly limited, and a known compound can be used. Among these, a compound having a triphenylene skeleton is preferable. 
     The disk-like liquid crystal compound may have a polymerizable group. The type of the polymerizable group is not particularly limited, and the polymerizable group is preferably a functional group capable of an addition polymerization reaction and more preferably a polymerizable ethylenically unsaturated group or a ring polymerizable group. More specifically, as the polymerizable group, a (meth)acryloyl group, a vinyl group, a styryl group, an allyl group, an epoxy group, or an oxetane group is preferable, and a (meth)acryloyl group is more preferable. 
     (Polymerization Initiator) 
     The composition for forming a liquid crystal layer may include a polymerization initiator. In particular, in a case where the disk-like liquid crystal compound has a polymerizable group, it is preferable that the composition for forming a liquid crystal layer includes a polymerization initiator. 
     As the polymerization initiator, a photopolymerization initiator capable of initiating a polymerization reaction with ultraviolet irradiation is preferable. Examples of the photopolymerization initiator include α-carbonyl compounds (described in U.S. Pat. Nos. 2,367,661A and 2,367,670A), acyloin ethers (described in U.S. Pat. No. 2,448,828A), α-hydrocarbon-substituted aromatic acyloin compounds (described in U.S. Pat. No. 2,722,512A), polynuclear quinone compounds (described in U.S. Pat. Nos. 3,046,127A and 2,951,758A), combinations of triarylimidazole dimer and p-aminophenyl ketone (described in U.S. Pat. No. 3,549,367A), acridine and phenazine compounds (described in JP1985-105667A (JP-S60-105667A) and U.S. Pat. No. 4,239,850A), and oxadiazole compounds (described in U.S. Pat. No. 4,212,970A). 
     The content (in a case where a plurality of kinds of polymerization initiators are included, the total content thereof) of the polymerization initiator in the composition for forming a liquid crystal layer is not particularly limited, but is preferably 0.1 to 20 mass % and more preferably 1.0 to 8.0 mass % with respect to the total mass of the disk-like liquid crystal compound. 
     (Surfactant) 
     The composition for forming a liquid crystal layer may include a surfactant which can be unevenly distributed on the substrate side surface of the composition layer and/or the surface opposite to the substrate of the composition layer. In a case where the composition for forming a liquid crystal layer includes a surfactant, the disk-like crystal compound is easily aligned at a desired inclination angle. 
     Examples of the surfactant include onium salt compounds (described in JP2012-208397A), boronic acid compounds (described in JP2013-054201A), perfluoroalkyl compounds (described in JP4592225B; FTERGENT manufactured by NEOS COMPANY LIMITED), and polymers including a functional group thereof. 
     The surfactant may be used alone or in combination of two or more kinds thereof. 
     The content (in a case where a plurality of kinds of surfactants are included, the total content thereof) of the surfactant in the composition for forming a liquid crystal layer is not particularly limited, but is preferably 0.01 to 10 mass %, more preferably 0.01 to 5.0 mass %, and still more preferably 0.01 to 2.0 mass % with respect to the total mass of the disk-like crystal compound. 
     (Solvent) 
     The composition for forming a liquid crystal layer may include a solvent. 
     Examples of the solvent include water and organic solvents. Examples of the organic solvent include amides such as N,N-dimethylformamide; sulfoxides such as dimethyl sulfoxide; heterocyclic compounds such as pyridine; hydrocarbons such as benzene and hexane; alkyl halides such as chloroform and dichloromethane; esters such as methyl acetate, butyl acetate, and propylene glycol monoethyl ether acetate; ketones such as acetone, methyl ethyl ketone, cyclohexanone, and cyclopentanone; ethers such as tetrahydrofuran and 1,2-dimethoxyethane; and 1,4-butanediol diacetate. These may be used alone or in combination of two or more kinds thereof 
     (Other Additives) 
     The composition for forming a liquid crystal layer may include other additives such as one or two or more kinds of antioxidants, ultraviolet absorbers, sensitizers, stabilizers, plasticizers, chain transfer agents, polymerization inhibitors, anti-foaming agents, leveling agents, thickeners, flame retardants, surface active substances, dispersants, and colorants such as a dye and a pigment. 
     &lt;&lt;Procedure of Step 1-1&gt;&gt; 
     In the step 1-1, as the step of forming a composition layer on the substrate, a step of forming a coating film of the above-described composition for forming a liquid crystal layer on the above-described substrate is preferable. 
     The coating method is not particularly limited, and examples thereof include a wire bar coating method, an extrusion coating method, a direct gravure coating method, a reverse gravure coating method, and a die-coating method. 
     After the application of the composition for forming a liquid crystal layer, a treatment of drying the coating film applied to the substrate may be performed as necessary. By performing the drying treatment, the solvent can be removed from the coating film. 
     The thickness of the coating film is not particularly limited, but is preferably 0.1 to 20 μm, more preferably 0.2 to 15 μm, and still more preferably 0.5 to 10 
     &lt;&lt;Procedure of Step 1-2&gt;&gt; 
     The step 1-2 is preferably a step of aligning the disk-like crystal compound in the composition layer by heating the above-described coating film. 
     As a preferred heating condition, it is preferable to heat the composition layer at 40° C. to 150° C. (preferably 60° C. to 100° C.) for 0.5 to 5 minutes (preferably 0.5 to 2 minutes). In a case of heating the composition layer, it is preferable that the composition layer is not heated to a temperature at which the liquid crystal compound exhibits an isotropic phase (Iso). In a case where the composition layer is heated to equal to or higher than a temperature at which the disk-like liquid crystal compound exhibits an isotropic phase, defects in the inclined and aligned liquid crystal phase increase, which is not preferable. 
     [Curing Treatment] 
     In a case where the disk-like liquid crystal compound has a polymerizable group, it is preferable that a curing treatment is performed on the composition layer. 
     The method of the curing treatment is not particularly limited, and examples thereof include photo-curing treatment and thermosetting treatment. Among these, a light irradiation treatment is preferable and an ultraviolet irradiation treatment is more preferable. In a case where the disk-like liquid crystal compound has a polymerizable group, the curing treatment is preferably a polymerization reaction by light irradiation (particularly ultraviolet irradiation), and more preferably a radical polymerization reaction by light irradiation (particularly ultraviolet irradiation). 
     A light source such as an ultraviolet lamp is used for the ultraviolet irradiation. 
     The irradiation energy amount of the ultraviolet rays is not particularly limited, but generally, is preferably approximately 100 to 800 mJ/cm 2 . The time for irradiation with ultraviolet rays is not particularly limited, but may be appropriately determined from the viewpoint of both the sufficient strength and productivity of the layer to be obtained. 
     [Average Inclination Angle of Disk-Like Liquid Crystal Compound and Azimuthal Angle Controlling Ability of Inclined Alignment Surface of Liquid Crystal Layer] 
     In the above-described inclined alignment surface of the above-described liquid crystal layer, an average inclination angle (average tilt angle) of the disk-like liquid crystal compound with respect to the surface of the liquid crystal layer is, for example, preferably 20° to 90°, more preferably 20° to 80°, still more preferably 30° to 80°, and still more preferably 30° to 65°. 
     The above-described average inclination angle is a value obtained by measuring, in the polarizing microscope observation of the cross section of the liquid crystal layer, the angle between the molecular axis of the disk-like liquid crystal compound and the surface of the liquid crystal layer at any five or more points, and arithmetically averaging these values. 
     In the above-described inclined alignment surface of the above-described liquid crystal layer, the average inclination angle of the disk-like liquid crystal compound with respect to the surface of the liquid crystal layer can be measured by observing the cross section of the liquid crystal layer with a polarizing microscope. 
     In addition, in the above-described inclined alignment surface of the above-described liquid crystal layer, an azimuthal angle controlling ability is, for example, 0.00030 J/m 2  or less, preferably less than 0.00020 J/m 2 , more preferably 0.00010 J/m 2  or less, and still more preferably 0.00005 J/m 2  or less. The lower limit is not particularly limited, but is, for example, 0.00000 J/m 2  or more. 
     The azimuthal angle controlling ability in the above-described inclined alignment surface of the above-described liquid crystal layer can be measured by a method described in J. Appl. Phys. 1992, 33, L1242. 
     By adjusting the inclination angle of the disk-like liquid crystal compound in the above-described inclined alignment surface of the above-described liquid crystal layer, there is an advantage that the inclination angle with respect to the main plane of the molecular axis of the liquid crystal compound in the inclined cholesteric liquid crystal layer can be easily adjusted to a predetermined angle. That is, as an example of the above-described inclined cholesteric liquid crystal layer  10  (see  FIGS. 10 and 11 ), there is an advantage that an average angle  93  with respect to the main plane  11  of the molecular axis L 1  of the liquid crystal compound  14  in the inclined cholesteric liquid crystal layer  10  can be easily adjusted. 
     By adjusting the azimuthal angle controlling ability in the above-described inclined alignment surface of the above-described liquid crystal layer, in the main plane of the inclined cholesteric liquid crystal layer, the orientation of the molecular axis of the liquid crystal compound easily changes consecutively while rotating over one direction in the plane. That is, as an example of the above-described inclined cholesteric liquid crystal layer  10  (see  FIGS. 10 and 11 ), by adjusting the azimuthal angle controlling ability in the above-described inclined alignment surface of the above-described liquid crystal layer, the liquid crystal compound  14  is arrayed along a plurality of array axes D 1  parallel to each X-Y plane, and in each of the array axes D 1 , the orientation of the molecular axis L 1  of the liquid crystal compound  14  easily changes consecutively while rotating over one direction in the plane along the array axis D 1 . 
     [Step 2] 
     Step 2 is a step of forming an inclined cholesteric liquid crystal layer on the liquid crystal layer using a composition including a liquid crystal compound. The step 2 will be described below. 
     The step 2 preferably has the following step 2-1 and the following step 2-2. 
     Step 2-1: 
     step of forming a composition layer satisfying Requirement 1 or Requirement 2 on the liquid crystal layer formed in the step 1 
     Requirement 1: at least a part of the above-described liquid crystal compound in the above-described composition layer is inclined and aligned with respect to the surface of the above-described composition layer. 
     Requirement 2: above-described liquid crystal compound is aligned such that a tilt angle of the above-described liquid crystal compound in the above-described composition layer changes consecutively along the thickness direction. 
     Step 2-2: 
     step of forming an inclined cholesteric liquid crystal layer by performing a treatment for cholesteric alignment of the above-described liquid crystal compound in the above-described composition layer 
     The step 2-1 and the step 2-2 will be described below. 
     &lt;&lt;Working Mechanism of Step 2-1&gt;&gt; 
     First,  FIG. 17  shows a schematic cross-sectional view of a composition layer satisfying Requirement 1 obtained in the step 2-1. A liquid crystal compound  14  shown in  FIG. 17  is a rod-like liquid crystal compound. 
     As shown in  FIG. 17 , a composition layer  100  is formed on a liquid crystal layer  102  formed by using the disk-like liquid crystal compound. In the surface on the side in contact with the composition layer  100 , the liquid crystal layer  102  has an inclined alignment surface  102   a  in which the molecular axis of the disk-like liquid crystal compound is inclined with respect to the surface of the liquid crystal layer  102  (see  FIG. 18 ). 
     As shown in  FIG. 17 , in the composition layer  100  disposed on the inclined alignment surface  102   a  of the liquid crystal layer  102 , since the liquid crystal compound  14  is loosely aligned and restricted by the inclined alignment surface  102   a , the liquid crystal compound  14  is aligned so as to be inclined with respect to the inclined alignment surface  102   a . In other words, in the composition layer  100 , the liquid crystal compound  14  is aligned in a certain direction (uniaxial direction) so that an angle between the molecular axis L 1  of the liquid crystal compound  14  and the surface of the composition layer  100  is a predetermined angle θ 10 . 
     In  FIG. 17 , an embodiment in which the liquid crystal compound  14  is aligned such that the angle between the molecular axis L 1  and the inclined alignment surface  102   a  is a predetermined angle θ 10  over the entire area of the composition layer  100  in a thickness direction R 1  has been shown, but as the composition layer satisfying Requirement 1 obtained in the step 2-1, it is sufficient that a part of the liquid crystal compound  14  is inclined and aligned. It is preferable that, in at least one of a surface (corresponding to an area A in  FIG. 17 ) on a side of inclined alignment surface  102   a  of the composition layer  100  or a surface (corresponding to an area B in  FIG. 17 ) opposite to the side of inclined alignment surface  102   a  of the composition layer  100 , the liquid crystal compound  14  is aligned such that the angle between the molecular axis L 1  and the surface of the composition layer  100  is the predetermined angle θ 10 , and it is more preferable that, in the surface on the side of inclined alignment surface  102   a , the liquid crystal compound  14  is inclined and aligned such that the angle between the molecular axis L 1  and the surface of the composition layer  100  is the predetermined angle θ 10 . In a case where, in at least one of the area A or the area B, the liquid crystal compound  14  is aligned such that the angle between the molecular axis L 1  and the surface of the composition layer  100  is a predetermined angle θ 10 , the cholesteric alignment of the liquid crystal compound  14  in the other area can be induced due to the orientation restriction power based on the aligned liquid crystal compound  14  in the area A and/or the area B, in a case where the liquid crystal compound  14  is in a state of cholesteric liquid crystalline phase in the subsequent step 2-2. 
     In addition, although not shown, a composition layer satisfying Requirement 2 described above corresponds to a composition layer in which, in the composition layer  100  shown in  FIG. 17 , the liquid crystal compound  14  is hybrid-aligned with respect to the surface of the composition layer  100 . That is, in the above description of  FIG. 17 , the angle θ 10  changes consecutively in the thickness direction. Specifically, the liquid crystal compound  14  is aligned such that a tilt angle θ 20  (angle between the molecular axis L 1  and the surface of the composition layer  100 ) thereof changes consecutively along a thickness direction R 1  of the composition layer  100 . 
     As the composition layer satisfying Requirement 2 obtained in the step 2-1, it is sufficient that a part of the liquid crystal compound  14  is hybrid-aligned. It is preferable that, in at least one of a surface (corresponding to an area A in  FIG. 17 ) on a side of inclined alignment surface  102   a  of the composition layer  100  or a surface (corresponding to an area B in  FIG. 17 ) opposite to the side of inclined alignment surface  102   a  of the composition layer  100 , the liquid crystal compound  14  is hybrid-aligned with respect to the inclined alignment surface  102   a , and it is more preferable that, in the surface on the side of inclined alignment surface  102   a , the liquid crystal compound  14  is hybrid-aligned with respect to the surface of the composition layer  100 . 
     The angles θ 10  and θ 20  are not particularly limited as long as the angles are not 0° over the entire composition layer (in a case where the angle θ 10  is 0° over the entire composition layer, the molecular axis L 1  of the liquid crystal compound  14  is parallel to the inclined alignment surface  102   a  in a case where the liquid crystal compound  14  is a rod-like liquid crystal compound). In other words, in some areas of the composition layer, the angles θ 10  and θ 20  may be 0°. 
     The angles θ 10  and θ 20  are, for example, 0° to 90°. Among these, the angles θ 10  and θ 20  are preferably 0° to 50°, and more preferably 0° to 10°. 
     From the viewpoint that reflection anisotropy of the inclined cholesteric liquid crystal layer is more excellent, the composition layer obtained in the step 2-1 is preferably a composition layer satisfying Requirement 1 or Requirement 2, and more preferably a composition layer satisfying Requirement 2. 
     &lt;&lt;Working Mechanism of Step 2-2&gt;&gt; 
     After obtaining, in the above-described step 2-1, the composition layer satisfying Requirement 1 or Requirement 2, in the step 2-2, the liquid crystal compound in the above-described composition layer is cholesterically aligned (in other words, the above-described liquid crystal compound is used as a cholesteric liquid crystalline phase) to form an inclined cholesteric liquid crystal layer. 
     As a result, an inclined cholesteric liquid crystal layer as shown in  FIG. 18  (inclined cholesteric liquid crystal layer  10  shown in  FIGS. 10 and 11 ) is obtained. 
     A laminate  50  shown in  FIG. 18  includes a liquid crystal layer  102  formed by using a disk-like liquid crystal compound  18 , and an inclined cholesteric liquid crystal layer  10  disposed so as to be in contact with the liquid crystal layer  102 . 
     In the surface on the side in contact with the inclined cholesteric liquid crystal layer  10 , the liquid crystal layer  102  has an inclined alignment surface  102   a  in which a molecular axis L 5  of the disk-like liquid crystal compound  18  is inclined with respect to the surface of the liquid crystal layer  102  (also corresponding to a main plane  11  and main plane  12  (X-Y plane) of the inclined cholesteric liquid crystal layer  10 ). That is, in the inclined alignment surface  102   a , the disk-like liquid crystal compound  18  is aligned such that the molecular axis L 5  thereof is inclined with respect to the surface of the liquid crystal layer  102 . 
     In the above-described inclined alignment surface  102   a  of the above-described liquid crystal layer  102 , an average inclination angle θ 4  (average value of angles θ 5  between the surface of the above-described liquid crystal layer  102  and the disk-like liquid crystal compound  18 ) of the disk-like liquid crystal compound  18  with respect to the surface of the above-described liquid crystal layer  102  is, for example, preferably 20° to 90°, more preferably 20° to 80°, still more preferably 30° to 80°, and particularly preferably 30° to 65°. 
     In the above-described inclined alignment surface  102   a  of the above-described liquid crystal layer  102 , the average inclination angle θ 4  of the disk-like liquid crystal compound  18  with respect to the surface of the liquid crystal layer  102  can be measured by observing the cross section of the liquid crystal layer with a polarizing microscope. The above-described average inclination angle is a value obtained by measuring, in the polarizing microscope observation of the cross section of the liquid crystal layer, the angle between the molecular axis L 5  of the disk-like liquid crystal compound  18  and the surface of the liquid crystal layer  102  at any five or more points, and arithmetically averaging these values. 
     In addition, in the above-described inclined alignment surface  102   a  of the above-described liquid crystal layer  102 , an azimuthal angle controlling ability is, for example, 0.00030 J/m 2  or less, preferably less than 0.00020 J/m 2 , more preferably 0.00010 J/m 2  or less, and more preferably 0.00005 J/m 2  or less. The lower limit is not particularly limited, but is, for example, 0.00000 J/m 2  or more. 
     The azimuthal angle controlling ability in the above-described inclined alignment surface  102   a  of the above-described liquid crystal layer  102  can be measured by a method described in J. Appl. Phys. 1992, 33, L1242. 
     In  FIG. 18 , it is described that the helical axis of the inclined cholesteric liquid crystal layer and the molecular axis of the disk-like liquid crystal compound are inclined in opposite directions, but the inclined directions may be the same. 
     In addition, in the laminate  50 , it is sufficient that the alignment state of the disk-like liquid crystal compound  18  is maintained in the layer, and the composition in the layer no longer needs to exhibit liquid crystallinity at last. 
     The inclined cholesteric liquid crystal layer  10  is as described above. 
     &lt;&lt;Working Mechanism of Liquid Crystal Composition&gt;&gt; 
     As described above, as one method for achieving the above-described method for manufacturing the inclined cholesteric liquid crystal layer, the present inventors have found a method of using a liquid crystal composition including a chiral agent X in which helical twisting power (HTP) changes due to irradiation with light or including a chiral agent Y in which the helical twisting power changes due to change in temperature. In the following, the working mechanism of a liquid crystal composition including a chiral agent X and the working mechanism of a liquid crystal composition including a chiral agent Y will be described in detail. 
     The helical twisting power (HTP) of the chiral agent is a factor indicating a helical alignment ability represented by Expression (1A). 
       HTP [μm −1 ]=1/(length (unit: μm) of helical pitch×concentration (mass %) of chiral agent in liquid crystal composition)  Expression (1A)
 
     The length of the helical pitch refers to a length of a pitch P (=helical period) of the helical structure of the cholesteric liquid crystalline phase, and can be measured by a method described in page 196 of Liquid Crystal Handbook (published by Maruzen Publishing Co., Ltd.). The concentration of the chiral agent in the liquid crystal composition refers to a concentration (mass %) of the chiral agent with respect to the total solid content in the composition. 
     The above-described HTP value is affected not only by the type of the chiral agent, but also by the type of the liquid crystal compound included in the composition. Therefore, for example, in a case where a composition including a predetermined chiral agent X and a liquid crystal compound A and a composition including a predetermined chiral agent X and a liquid crystal compound B different from the liquid crystal compound A are prepared, and HTP of both compositions are measured at the same temperature, the values thereof may differ. 
     The helical twisting power (HTP) of the chiral agent is also expressed by Expression (1B). 
       HTP [μm −1 ]=(average refractive index of liquid crystal compound)/{(concentration (mass %) of chiral agent in liquid crystal composition)×(center reflection wavelength (nm))}  Expression (1B)
 
     In a case where the liquid crystal composition includes two or more kinds of chiral agents, the “concentration of chiral agent in liquid crystal composition” in Expressions (1A) and (1B) corresponds to the total concentration of all chiral agents. 
     (Working Mechanism of Liquid Crystal Composition Including Chiral Agent X) 
     In the following, a method for forming an inclined cholesteric liquid crystal layer using a liquid crystal composition including a chiral agent X will be described. 
     In a case of forming an inclined cholesteric liquid crystal layer using a liquid crystal composition including a chiral agent X, after forming, in the step 2-1, the composition layer satisfying Requirement 1 or Requirement 2, in the step 2-2, the liquid crystal compound in the above-described composition layer is cholesterically aligned by performing a light irradiation treatment on the above-described composition layer. That is, in the above-described step 2-2, by changing the helical twisting power of the chiral agent X in the composition layer by a light irradiation treatment, the liquid crystal compound in the composition layer is cholesterically aligned. 
     Here, in a case where the liquid crystal compound in the composition layer is aligned to be a cholesteric liquid crystalline phase, it is considered that the helical twisting power inducing the helix of the liquid crystal compound generally corresponds to the weighted-average helical twisting power of chiral agents included in the composition layer. For example, in a case where two types of chiral agents (chiral agent A and chiral agent B) are used in combination, the “weighted-average helical twisting power” is expressed by Expression (1C). 
       Weighted-average helical twisting power (μm −1 )=(helical twisting power (μm −1 ) of chiral agent  A ×concentration (mass %) of chiral agent  A  in liquid crystal composition+helical twisting power (μm −1 ) of chiral agent  B ×concentration (mass %) of chiral agent  B  in liquid crystal composition)/(concentration (mass %) of chiral agent  A  in liquid crystal composition+concentration (mass %) of chiral agent  B  in liquid crystal composition)  Expression (1C)
 
     In Expression (1C), in a case where the helical direction of the chiral agent is right-handed, the helical twisting power thereof is a positive value. In addition, in a case where the helical direction of the chiral agent is left-handed, the helical twisting power thereof is a negative value. That is, for example, in a case of a chiral agent having a helical twisting power of 10 μm −1 , the helical twisting power is expressed as 10 μm −1  in a case where the helical direction of the helix induced by the chiral agent is right-handed. On the other hand, the helical twisting power is expressed as −10 μm −1  in a case where the helical direction of the helix induced by the chiral agent is left-handed. 
     The weighted-average helical twisting power (μm −1 ) obtained by Expression (1C) can also be calculated from Expression (1A) and Expression (1B) described above. 
     Hereinafter, a weighted-average helical twisting power, for example, in a case where the composition layer includes a chiral agent A and chiral agent B having the following characteristics will be described. 
     As shown in  FIG. 19 , the above-described chiral agent A is the chiral agent X, and is a chiral agent which has a left-handed (−) helical twisting power and reduces helical twisting power due to irradiation with light. 
     In addition, as shown in  FIG. 19 , the above-described chiral agent B is a chiral agent which has a right-handed (+) helical twisting power, which is opposite direction to the chiral agent A, and in which the helical twisting power does not change due to irradiation with light. Here, the “helical twisting power (μm −1 ) of chiral agent A×concentration (mass %) of chiral agent A” and “helical twisting power (μm −1 ) of chiral agent B×concentration (mass %) of chiral agent B” in a case of non-light irradiation is assumed to be equal. In the “helical twisting power (μm −1 ) of chiral agent×concentration (mass %) of chiral agent” of the vertical axis in  FIG. 19 , as the value thereof is farther from 0, the helical twisting power is greater. 
     In a case where the composition layer includes the above-described chiral agent A and chiral agent B, the helical twisting power inducing the helix of the liquid crystal compound corresponds to the weighted-average helical twisting power of the chiral agent A and the chiral agent B. As a result, in a system in which the above-described chiral agent A and the above-described chiral agent B are used in combination, as shown in  FIG. 20 , it is considered that, in the helical twisting power inducing the helix of the liquid crystal compound, as the amount of light irradiated is larger, the helical twisting power increases in the direction (+) of the helix induced by the chiral agent B (corresponding to the chiral agent Y). 
     In the method for manufacturing the inclined cholesteric liquid crystal layer according to the present embodiment, the absolute value of the weighted-average helical twisting power of chiral agents in the composition layer formed by the step 2-1 is not particularly limited, but from the viewpoint that the composition layer is easily formed, for example, preferably 0.0 to 1.9 μm −1 , more preferably 0.0 to 1.5 μm −1 , still more preferably 0.0 to 0.5 μm −1 , and most preferably 0 (see  FIG. 19 ). On the other hand, in a case of the light irradiation treatment in the step 2-2, the absolute value of the weighted-average helical twisting power of chiral agents in the composition layer is not particularly limited as long as the liquid crystal compound can be cholesterically aligned, but for example, the absolute value thereof is preferably 10.0 μm −1  or more, more preferably 10.0 to 200.0 μm −1 , and still more preferably 20.0 to 200.0 μm −1 . 
     That is, in a case where the helical twisting power of the chiral agent X in the composition layer in the step 2-1 is offset to approximately 0, the liquid crystal compound in the composition layer can be aligned to be inclined alignment or hybrid alignment. Next, by changing the helical twisting power of chiral agents X due to the light irradiation treatment in the step 2-2 so as to increase the weighted-average helical twisting power of chiral agents in the composition layer in either the right direction (+) or left direction (−), an inclined cholesteric liquid crystal layer (for example, the inclined cholesteric liquid crystal layer  10 ) is obtained. 
     (Working Mechanism of Liquid Crystal Composition Including Chiral Agent Y) 
     Next, a method for forming an inclined cholesteric liquid crystal layer using a liquid crystal composition including a chiral agent Y will be described. 
     In a case of forming an inclined cholesteric liquid crystal layer using a liquid crystal composition including a chiral agent Y, after forming, in the step 2-1, the composition layer satisfying Requirement 1 or Requirement 2, in the step 2-2, the liquid crystal compound in the above-described composition layer is cholesterically aligned by performing a cooling treatment or a heating treatment on the above-described composition layer. That is, in the above-described step 2-2, by changing the helical twisting power of the chiral agent Y in the composition layer by a cooling treatment or a heating treatment, the liquid crystal compound in the composition layer is cholesterically aligned. 
     As described above, in a case where the liquid crystal compound in the composition layer is aligned to be a cholesteric liquid crystalline phase, it is considered that the helical twisting power inducing the helix of the liquid crystal compound generally corresponds to the weighted-average helical twisting power of chiral agents included in the composition layer. The “weighted-average helical twisting power” is as described above. 
     Hereinafter, the working mechanism of the chiral agent Y will be described, taking as an example an embodiment in which, in the step 2-2, the liquid crystal compound of the above-described composition layer is cholesterically aligned by performing a cooling treatment. 
     First, in the following, a weighted-average helical twisting power, for example, in a case where the composition layer includes a chiral agent A and chiral agent B having the following characteristics will be described. 
     As shown in  FIG. 21 , the above-described chiral agent A corresponds to the chiral agent Y, and is a chiral agent that has a left-handed (−) helical twisting power in a temperature T 11  at which the alignment treatment of the liquid crystal compound is performed for forming the composition layer satisfying Requirement 1 or Requirement 2 in the step 1, and a temperature T 12  at which the cooling treatment of the step 2-2 is performed, and increases helical twisting power to the left direction (−) in the lower temperature region. In addition, as shown in  FIG. 21 , the above-described chiral agent B is a chiral agent which has a right-handed (+) helical twisting power, which is opposite direction to the chiral agent A, and in which the helical twisting power does not change due to change in temperature. Here, the “helical twisting power (μm −1 ) of chiral agent A×concentration (mass %) of chiral agent A” and “helical twisting power (μm −1 ) of chiral agent B×concentration (mass %) of chiral agent B” in a case of the temperature T 11  is assumed to be equal. 
     In a case where the composition layer includes the above-described chiral agent A and chiral agent B, the helical twisting power inducing the helix of the liquid crystal compound corresponds to the weighted-average helical twisting power of the chiral agent A and the chiral agent B. As a result, in a system in which the above-described chiral agent A and the above-described chiral agent B are used in combination, as shown in  FIG. 22 , it is considered that, in the helical twisting power inducing the helix of the liquid crystal compound, the helical twisting power increases, in the lower temperature region, in the direction (−) of the helix induced by the chiral agent A (corresponding to the chiral agent Y). 
     In the method for manufacturing the inclined cholesteric liquid crystal layer according to the present embodiment, the absolute value of the weighted-average helical twisting power of chiral agents in the composition layer is not particularly limited, but from the viewpoint that the composition layer is easily formed in a case of forming the composition layer satisfying Requirement 1 or Requirement 2 in the step 2-1 (that is, in the present embodiment, at the temperature T 11  at which the alignment treatment of the liquid crystal compound is performed for forming the composition layer satisfying Requirement 1 or Requirement 2), for example, preferably 0.0 to 1.9 μm −1 , more preferably 0.0 to 1.5 μm −1 , still more preferably 0.0 to 0.5 μm −1 , and most preferably 0. 
     On the other hand, in a case of the temperature T 12  at which the cooling treatment of the step 2-2 is performed, the absolute value of the weighted-average helical twisting power of chiral agents in the composition layer is not particularly limited as long as the liquid crystal compound can be cholesterically aligned, but the absolute value thereof is preferably 10.0 μm −1  or more, more preferably 10.0 to 200.0 μm −1 , and still more preferably 20.0 to 200.0 μm −1  (see  FIG. 22 ). 
     That is, since the helical twisting power of the chiral agent Y at the temperature T 11  is offset to approximately 0, the liquid crystal compound can be aligned to be inclined alignment or hybrid alignment. Next, by increasing the helical twisting power of the chiral agent Y due to the cooling treatment or heating treatment (change in temperature to the temperature T 12 ) in the step 2-2 so as to increase the weighted-average helical twisting power of chiral agents in the composition layer in either the right direction (+) or left direction (−), an inclined cholesteric liquid crystal layer (for example, the inclined cholesteric liquid crystal layer  10 ) is obtained. 
     &lt;&lt;Procedure of Step 2&gt;&gt; 
     Hereinafter, the procedure of the step 2 will be described in detail. In the following, an aspect of using a liquid crystal composition including the chiral agent X and an aspect of using a liquid crystal composition including the chiral agent Y will be respectively described in detail. 
     (Aspect of Using Liquid Crystal Composition Including Chiral Agent X) 
     Hereinafter, the procedure of the step 2 (hereinafter, also referred to as a “step 2X”) of using a liquid crystal composition including the chiral agent X will be described. 
     The step 2X has at least the following steps 2X-1 and 2X-2. 
     Step 2X-1: step of forming a composition layer satisfying Requirement 1 or Requirement 2 on the liquid crystal layer using a liquid crystal composition including the chiral agent X and a liquid crystal compound 
     Step 2X-2: step of forming an inclined cholesteric liquid crystal layer by performing a light irradiation treatment to the above-described composition layer so as to cholesterically align the above-described liquid crystal compound in the above-described composition layer 
     Requirement 1: at least a part of the above-described liquid crystal compound in the above-described composition layer is inclined and aligned with respect to the surface of the above-described composition layer. 
     Requirement 2: above-described liquid crystal compound is aligned such that a tilt angle of the above-described liquid crystal compound in the above-described composition layer changes consecutively along the thickness direction. 
     In addition, in a case where the liquid crystal compound has a polymerizable group, in the step 2X, it is preferable that a curing treatment is performed on the composition layer as described later. 
     Hereinafter, the materials used in each step, and the procedure of each step will be described in detail. 
     &lt;&lt;Step 2X-1&gt;&gt; 
     Step 2X-1 is a step of forming a composition layer satisfying Requirement 1 or Requirement 2 on the liquid crystal layer using a liquid crystal composition (hereinafter, also referred to as a “composition X”) including the chiral agent X and a liquid crystal compound. 
     In the following, the composition X will be described in detail, and then the procedure of the step will be described in detail. 
     &lt;&lt;&lt;&lt;Composition X&gt;&gt;&gt;&gt; 
     The composition X includes a liquid crystal compound and a chiral agent X in which the helical twisting power changes due to irradiation with light. Hereinafter, each component will be described. 
     As described above, from the viewpoint that the composition layer is easily formed, the absolute value of the weighted-average helical twisting power of chiral agents in the composition layer obtained by the step 2X-1 is preferably 0.0 to 1.9 μm −1 , more preferably 0.0 to 1.5 μm −1 , still more preferably 0.0 to 0.5 μm −1 , and most preferably 0. Therefore, in a case where the chiral agent X has a helical twisting power exceeding the above-described predetermined range in a state of non-light irradiation treatment, it is preferable that the composition X includes a chiral agent (hereinafter, also referred to as a “chiral agent XA”) which induces a helix in the opposite direction to the chiral agent X, so that the helical twisting power of the chiral agent X is offset to approximately 0 in the step 2X-1 (that is, the weighted-average helical twisting power of chiral agents in the composition layer obtained in the step 2X-1 is within the above-described predetermined range). The chiral agent XA is preferably a compound which does not change the helical twisting power due to the light irradiation treatment. 
     In addition, in a case where the liquid crystal composition includes, as the chiral agent, a plurality of kinds of chiral agents X, and where the weighted-average helical twisting power of the plurality of kinds of chiral agents X in the state of non-light irradiation treatment has a helical twisting power outside the above-described predetermined range, the “other chiral agents XA which induce a helix in the opposite direction to the chiral agent X” are intended to be a chiral agent which induces a helix in the opposite direction to the weighted-average helical twisting power of the above-described plurality of kinds of chiral agents X. 
     In a case where the chiral agent X alone does not have the helical twisting power in the state of non-light irradiation treatment and has a property of increasing the helical twisting power due to irradiation with light, the chiral agent XA may not be used in combination. 
     Liquid Crystal Compound 
     The type of the liquid crystal compound is not particularly limited. 
     In general, the types of the liquid crystal compound are classified into a rod-shaped type (rod-like liquid crystal compound) and a disk-shaped type (discotic liquid crystal compound, disk-like liquid crystal compound) from the shapes thereof. Furthermore, the rod-shaped type and the disk-shaped type include a low molecular type and a high molecular type. A high molecule generally refers to a molecule having a polymerization degree of 100 or more (Masao Doi; Polymer Physics-Phase Transition Dynamics, 1992, IWANAMI SHOTEN, PUBLISHERS, page 2). In the present invention, any liquid crystal compound can be used. In addition, two or more kinds of liquid crystal compounds may be used in combination. 
     The liquid crystal compound may have a polymerizable group. The type of the polymerizable group is not particularly limited, and the polymerizable group is preferably a functional group capable of an addition polymerization reaction and more preferably a polymerizable ethylenically unsaturated group or a ring polymerizable group. More specifically, as the polymerizable group, a (meth)acryloyl group, a vinyl group, a styryl group, an allyl group, an epoxy group, or an oxetane group is preferable, and a (meth)acryloyl group is more preferable. 
     As the liquid crystal compound, a liquid crystal compound represented by Formula (I) is suitably used. 
     
       
         
         
             
             
         
       
     
     In the formula, 
     A represents a phenylene group which may have a substituent or a trans-1,4-cyclohexylene group which may have a substituent, in which at least one of A represents a trans-1,4-cyclohexylene group which may have a substituent, 
     L represents a single bond or a linking group selected from the group consisting of —CH 2 O—, —OCH 2 —, —(CH 2 ) 2 OC(═O)—, —C(═O)O(CH 2 ) 2 —, —C(═O)O—, —OC(═O)—, —OC(═O)O—, —CH═N—N═CH—, —CH═CH—, —C═C—, —NHC(═O)—, —C(═O)NH—, —CH═N—, —N═CH—, —CH═CH—C(═O)O—, and —OC(═O)—CH═CH—, 
     m represents an integer of 3 to 12, 
     Sp 1  and Sp 2  each independently represent a single bond or a linking group selected from the group consisting of a linear or branched alkylene group having 1 to 20 carbon atoms and a group of a linear or branched alkylene group having 1 to 20 carbon atoms, in which one or two or more of —CH 2 — are replaced with —O—, —S—, —NH—, —N(CH 3 )—, —C(═O)—, —OC(═O)—, or —C(═O)O—, and 
     Q 1  and Q 2  each independently represent a hydrogen atom or a polymerizable group selected from the group consisting of groups represented by Formulae (Q-1) to (Q-5), in which any one of Q 1  or Q 2  represents a polymerizable group. 
     
       
         
         
             
             
         
       
     
     A is a phenylene group which may have a substituent or a trans-1,4-cyclohexylene group which may have a substituent. In the present specification, the phenylene group is preferably a 1,4-phenylene group. 
     At least one of A is a trans-1,4-cyclohexylene group which may have a substituent. 
     m A&#39;s may be the same or different from each other. 
     m represents an integer of 3 to 12, and is preferably an integer of 3 to 9, more preferably an integer of 3 to 7, and still more preferably an integer of 3 to 5. 
     In Formula (I), the substituent which may be included in the phenylene group or the trans-1,4-cyclohexylene group is not particularly limited, and examples thereof include an alkyl group, a cycloalkyl group, an alkoxy group, an alkylether group, an amide group, an amino group, a halogen atom, and a substituent selected from the group consisting of groups composed of a combination of two or more of these substituents. In addition, examples of the above-described substituent include a substituent represented by —C(═O)—X 3 -Sp 3 -Q 3  described later. The phenylene group and trans-1,4-cyclohexylene group may have 1 to 4 substituents. In a case of having two or more substituents, the two or more substituents may be the same or different from each other. 
     In the present specification, the alkyl group may be linear or branched. The number of carbon atoms in the alkyl group is preferably 1 to 30, more preferably 1 to 10, and still more preferably 1 to 6. Examples of the alkyl group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, an n-pentyl group, an isopentyl group, a neopentyl group, a 1,1-dimethylpropyl group, an n-hexyl group, an isohexyl group, a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, and a dodecyl group. The description of an alkyl group in the alkoxy group is the same as the above description of the alkyl group. In addition, in the present specification, specific examples of the alkylene group in a case of being referred to as an alkylene group include a divalent group obtained by removing one arbitrary hydrogen atom from each of the alkyl group exemplified. Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. 
     In the present specification, the number of carbon atoms in the cycloalkyl group is preferably 3 or more and more preferably 5 or more, and is preferably 20 or less, more preferably 10 or less, still more preferably 8 or less, and particularly preferably 6 or less. Examples of the cycloalkyl group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group. 
     As the substituent which may be included in the phenylene group or the trans-1,4-cyclohexylene group, an alkyl group, an alkoxy group, or a substituent selected from the group consisting of —C(═O)—X 3 -Sp 3 -Q 3  is preferable. Here, X 3  represents a single bond, —O—, —S—, —N(Sp 4 -Q 4 )-, or a nitrogen atom forming a ring structure with Q 3  and Sp 3 . Sp 3  and Sp 4  each independently represent a single bond or a linking group selected from the group consisting of a linear or branched alkylene group having 1 to 20 carbon atoms and a group of a linear or branched alkylene group having 1 to 20 carbon atoms, in which one or two or more of —CH 2 — are replaced with —O—, —S—, —NH—, —N(CH 3 )—, —C(═O)—, —OC(═O)—, or —C(═O)O—. 
     Q 3  and Q 4  each independently represent a hydrogen atom, a cycloalkyl group, a cycloalkyl group in which one or two or more of —CH 2 — are replaced with —O—, —S—, —NH—, —N(CH 3 )—, —C(═O)—, —OC(═O)—, or —C(═O)O—, or any polymerizable group selected from the group consisting of the groups represented by Formulae (Q-1) to (Q-5). 
     Specific examples of the cycloalkyl group in which one or two or more of —CH 2 — are replaced with —O—, —S—, —NH—, —N(CH 3 )—, —C(═O)—, —OC(═O)—, or —C(═O)O— include a tetrahydrofuranyl group, a pyrrolidinyl group, an imidazolidinyl group, a pyrazolidinyl group, a piperidyl group, a piperazinyl group, and a morphinyl group. Among these, a tetrahydrofuranyl group is preferable, and a 2-tetrahydrofuranyl group is more preferable. 
     In Formula (I), L represents a single bond or a linking group selected from the group consisting of —CH 2 O—, —OCH 2 —, —(CH 2 ) 2 OC(═O)—, —C(═O)O(CH 2 ) 2 —, —C(═O)O—, —OC(═O)—, —OC(═O)O—, —CH═CH—C(═O)O—, and —OC(═O)—CH═CH—. L is preferably —C(═O)O— or —OC(═O)—. m L&#39;s may be the same or different from each other. 
     Sp 1  and Sp 2  each independently represent a single bond or a linking group selected from the group consisting of a linear or branched alkylene group having 1 to 20 carbon atoms and a group of a linear or branched alkylene group having 1 to 20 carbon atoms, in which one or two or more of —CH 2 — are replaced with —O—, —S—, —NH—, —N(CH 3 )—, —C(═O)—, —OC(═O)—, or —C(═O)O—. It is preferable that Sp 1  and Sp 2  are each independently a linear alkylene group having 1 to 10 carbon atoms, in which linking groups selected from the group consisting of —O—, —OC(═O)—, and —C(═O)O— are respectively bonded to both terminals, —OC(═O)—, —C(═O)O—, —O—, and a linking group composed of one or a combination of two or more groups selected from the group consisting of linear alkylene groups having 1 to 10 carbon atoms, and it is more preferable that Sp 1  and Sp 2  are each independently a linear alkylene group having 1 to 10 carbon atoms, in which —O—&#39;s are respectively bonded to both terminals. 
     Q 1  and Q 2  each independently represent a hydrogen atom or a polymerizable group selected from the group consisting of groups represented by Formulae (Q-1) to (Q-5). However, any one of Q 1  or Q 2  represents a polymerizable group. 
     
       
         
         
             
             
         
       
     
     As the polymerizable group, an acryloyl group (Formula (Q-1)) or a methacryloyl group (Formula (Q-2)) is preferable. 
     Specific examples of the above-described liquid crystal compound include a liquid crystal compound represented by Formula (I-11), a liquid crystal compound represented by Formula (I-21), and a liquid crystal compound represented by Formula (I-31). In addition to the above, examples thereof include known compounds such as a compound represented by Formula (I) described in JP2013-112631A, a compound represented by Formula (I) described in JP2010-070543A, a compound represented by Formula (I) described in JP2008-291218A, a compound represented by Formula (I) described in JP4725516B, a compound represented by General Formula (II) described in JP2013-087109A, a compound described in paragraph 0043 of JP2007-176927A, a compound represented by Formula (1-1) described in JP2009-286885A, a compound represented by General Formula (I) described in WO2014/010325A, a compound represented by Formula (1) described in JP2016-081035A, and compounds represented by Formula (2-1) and Formula (2-2) described in JP2016-121339A. 
     Liquid Crystal Compound Represented by Formula (I-11) 
     
       
         
         
             
             
         
       
     
     In the formula, R 11  represents a hydrogen atom, a linear or branched alkyl group having 1 to 12 carbon atoms, or —Z 12 -Sp 12 -Q 12 ,
         L 11  represents a single bond, —C(═O)O—, or —OC(═O)—,   L 12  represents —C(═O)O—, —OC(═O)—, or —CONR 2 —,   R 2  represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms,   Z 11  and Z 12  each independently represent a single bond, —O—, —NH—, —N(CH 3 )—, —S—, —C(═O)O—, —OC(═O)—, —OC(═O)O—, or —C(═O)NR 12 —,   R 12  represents a hydrogen atom or Sp 12 -Q 12 ,   Sp 11  and Sp 12  each independently represent a single bond, a linear or branched alkylene group which has 1 to 12 carbon atoms and may be substituted with Q 11 , or a linking group of a linear or branched alkylene group which has 1 to 12 carbon atoms and may be substituted with Q 11 , in which any one or more of —CH 2 — is replaced with —O—, —S—, —NH—, —N(Q 11 )-, or —C(═O)—,   Q 11  represents a hydrogen atom, a cycloalkyl group, a cycloalkyl group in which one or two or more of —CH 2 — are replaced with —O—, —S—, —NH—, —N(CH 3 )—, —C(═O)—, —OC(═O)—, or —C(═O)O—, or a polymerizable group selected from the group consisting of the groups represented by Formulae (Q-1) to (Q-5),   Q 12  represents a hydrogen atom or a polymerizable group selected from the group consisting of the groups represented by Formulae (Q-1) to (Q-5),   l 11  represents an integer of 0 to 2,   m 11  represents an integer of 1 or 2,   n 11  represents an integer of 1 to 3, and   a plurality of R 11 &#39;s, a plurality of L 11 &#39;s, a plurality of L 12 &#39;s, a plurality of l 11 &#39;s, a plurality of Z 11 &#39;s, a plurality of Sp 11 &#39;s, and a plurality of Q 11 &#39;s may be respectively the same or different from each other.       

     In addition, the liquid crystal compound represented by Formula (I-11) includes, as R 11 , at least one —Z 12 -Sp 12 -Q 12  in which Q 12  is a polymerizable group selected from the group consisting of the groups represented by Formulae (Q-1) to (Q-5). 
     In addition, the liquid crystal compound represented by Formula (I-11) preferably has —Z 11 -Sp 11 -Q 11  in which Z 11  is —C(═O)O— or C(═O)NR 12 — and Q 11  is a polymerizable group selected from the group consisting of the groups represented by Formulae (Q-1) to (Q-5). In addition, the liquid crystal compound represented by Formula (I-11) preferably includes, as R 11 , —Z 12 -Sp 12 -Q 12  in which Z 12  is —C(═O)O— or C(═O)NR 12 —, and Q 12  is a polymerizable group selected from the group consisting of the groups represented by Formulae (Q-1) to (Q-5). 
     The 1,4-cyclohexylene groups included in the liquid crystal compound represented by Formula (I-11) are all trans-1,4-cyclohexylene groups. 
     Examples of a suitable aspect of the liquid crystal compound represented by Formula (I-11) include a compound in which L 11  is a single bond, l 11  is 1 (dicyclohexyl group), and Q 11  is a polymerizable group selected from the group consisting of the groups represented by Formulae (Q-1) to (Q-5). 
     Examples of another suitable aspect of the liquid crystal compound represented by Formula (I-11) include a compound in which m 11  is 2, l 11  is 0, both R 11 &#39;s represent Z 12 -Sp 12 -Q 12 , and Q 12  is a polymerizable group selected from the group consisting of the groups represented by Formulae (Q-1) to (Q-5). 
     Liquid Crystal Compound Represented by Formula (I-21) 
     
       
         
         
             
             
         
       
     
     In the formula, Z 21  and Z 22  each independently represent a trans-1,4-cyclohexylene group which may have a substituent or a phenylene group which may have a substituent,
         all of the above-described substituents are each independently 1 to 4 substituents selected from the group consisting of —CO—X 21 -Sp 23 -Q 23 , an alkyl group, and an alkoxy group,   m21 represents an integer of 1 or 2 and n21 represents an integer of 0 or 1,   in a case where m21 represents 2, n21 represents 0,   in a case where m21 represents 2, two Z 21 &#39;s may be the same or different from each other,   at least one of Z 21  or Z 22  is a phenylene group which may have a substituent,   L 21 , L 22 , L 23 , and L 24  each independently represent a single bond or a linking group selected from the group consisting of —CH 2 O—, —OCH 2 —, —(CH 2 ) 2 OC(═O)—, —C(═O)O(CH 2 ) 2 —, —C(═O)O—, —OC(═O)—, —OC(═O)O—, —CH═CH—C(═O)O—, and —OC(═O)—CH═CH—,   X 21  represents —O—, —S—, —N(Sp 25 -Q 25 )-, or a nitrogen atom forming a ring structure with Q 23  and Sp 23 ,   r21 represents an integer of 1 to 4,   Sp 21 , Sp 22 , Sp 23 , and Sp 25  each independently represent a single bond or a linking group selected from the group consisting of a linear or branched alkylene group having 1 to 20 carbon atoms and a group of a linear or branched alkylene group having 1 to 20 carbon atoms, in which one or two or more of —CH 2 — are replaced with —O—, —S—, —NH—, —N(CH 3 )—, —C(═O)—, —OC(═O)—, or —C(═O)O—,   Q 21  and Q 22  each independently represent any polymerizable group selected from the group consisting of groups represented by Formulae (Q-1) to (Q-5),   Q 23  represents a hydrogen atom, a cycloalkyl group, a cycloalkyl group in which one or two or more of —CH 2 — are replaced with —O—, —S—, —NH—, —N(CH 3 )—, —C(═O)—, —OC(═O)—, or —C(═O)O—, any polymerizable group selected from the group consisting of the groups represented by Formulae (Q-1) to (Q-5), or a single bond in a case where X 21  is a nitrogen atom forming a ring structure with Q 23  and Sp 23 , and   Q 25  represents a hydrogen atom, a cycloalkyl group, a cycloalkyl group in which one or two or more of —CH 2 — are replaced with —O—, —S—, —NH—, —N(CH 3 )—, —C(═O)—, —OC(═O)—, or —C(═O)O—, or any polymerizable group selected from the group consisting of the groups represented by Formulae (Q-1) to (Q-5), in which, in a case where Sp 25  is a single bond, Q 25  is not a hydrogen atom.       

     The liquid crystal compound represented by Formula (I-21) is also preferably a structure in which 1,4-phenylene groups and trans-1,4-cyclohexylene groups are present alternately, and preferred examples thereof include a structure in which m21 is 2, n21 is 0, and Z 21 &#39;s are respectively, from the Q 21  side, a trans-1,4-cyclohexylene group which may have a substituent and an arylene group which may have a substituent, and a structure in which m21 is 1, n21 is 1, Z 21  is an arylene group which may have a substituent, and Z 22  is an arylene group which may have a substituent. 
     Liquid Crystal Compound Represented by Formula (I-31); 
     
       
         
         
             
             
         
       
     
     In the formula, R 31  and R 32  each independently represent an alkyl group, an alkoxy group, or a group selected from the group consisting of —C(═O)—X 31 -Sp 33 -Q 33 ,
         n31 and n32 each independently represent an integer of 0 to 4,   X 31  represents a single bond, —O—, —S—, —N(Sp 34 -Q 34 )-, or a nitrogen atom forming a ring structure with Q 33  and Sp 33 ,   Z 31  represents a phenylene group which may have a substituent,   Z 32  represents a trans-1,4-cyclohexylene group which may have a substituent or a phenylene group which may have a substituent,       

     all of the above-described substituents are each independently 1 to 4 substituents selected from the group consisting of an alkyl group, an alkoxy group, and —C(═O)—X 31 -Sp 33 -Q 33 ,
         m31 represents an integer of 1 or 2 and m32 represents an integer of 0 to 2,   in a case where m31 and m32 represent 2, two Z 31 &#39;s and two Z 32 &#39;s may be respectively the same or different from each other,   L 31  and L 32  each independently represent a single bond or a linking group selected from the group consisting of —CH 2 O—, —OCH 2 —, —(CH 2 ) 2 OC(═O)—, —C(═O)O(CH 2 ) 2 —, —C(═O)O—, —OC(═O)—, —OC(═O)O—, —CH═CH—C(═O)O—, and OC(═O)—CH═CH—,   Sp 31 , Sp 32 , Sp 33 , and Sp 34  each independently represent a single bond or a linking group selected from the group consisting of a linear or branched alkylene group having 1 to 20 carbon atoms and a group of a linear or branched alkylene group having 1 to 20 carbon atoms, in which one or two or more of —CH 2 — are replaced with —O—, —S—, —NH—, —N(CH 3 )—, —C(═O)—, —OC(═O)—, or —C(═O)O—,   Q 31  and Q 32  each independently represent any polymerizable group selected from the group consisting of groups represented by Formulae (Q-1) to (Q-5), and   Q 33  and Q 34  each independently represent a hydrogen atom, a cycloalkyl group, a cycloalkyl group in which one or two or more of —CH 2 — are replaced with —O—, —S—, —NH—, —N(CH 3 )—, —C(═O)—, —OC(═O)—, or —C(═O)O—, or any polymerizable group selected from the group consisting of the groups represented by Formulae (Q-1) to (Q-5), in which, in a case where Q 33  forms a ring structure with X 31  and Sp 33 , Q 33  may represent a single bond, and in a case where Sp 34  is a single bond, Q 34  is not a hydrogen atom.       

     Examples of a particularly preferred compound as the liquid crystal compound represented by Formula (I-31) include a compound in which Z 32  is a phenylene group, and a compound in which m32 is 0. 
     The compound represented by Formula (I) also preferably has a partial structure represented by Formula (II). 
     
       
         
         
             
             
         
       
     
     In Formula (II), a black circle represents a bonding position to other parts of Formula (I). It is sufficient that the partial structure represented by Formula (II) is included as a part of a partial structure represented by Formula (III) in Formula (I). 
     
       
         
         
             
             
         
       
     
     In the formula, R 1  and R 2  each independently represent a hydrogen atom, an alkyl group, an alkoxy group, or a group selected from the group consisting of groups represented by —C(═O)—X 3 -Sp 3 -Q 3 . Here, X 3  represents a single bond, —O—, —S—, —N(Sp 4 -Q 4 )-, or a nitrogen atom forming a ring structure with Q 3  and Sp 3 . X 3  is preferably a single bond or O—. R 1  and R 2  are preferably —C(═O)—X 3 -Sp 3 -Q 3 . In addition, it is preferable that R 1  and R 2  are the same as each other. The bonding position of R 1  and R 2  to each phenylene group is not particularly limited. 
     Sp 3  and Sp 4  each independently represent a single bond or a linking group selected from the group consisting of a linear or branched alkylene group having 1 to 20 carbon atoms and a group of a linear or branched alkylene group having 1 to 20 carbon atoms, in which one or two or more of —CH 2 — are replaced with —O—, —S—, —NH—, —N(CH 3 )—, —C(═O)—, —OC(═O)—, or —C(═O)O—. Sp 3  and Sp 4  are each independently preferably a linear or branched alkylene group having 1 to 10 carbon atoms, more preferably a linear alkylene group having 1 to 5 carbon atoms, and still more preferably a linear alkylene group having 1 to 3 carbon atoms.
         Q 3  and Q 4  each independently represent a hydrogen atom, a cycloalkyl group, a cycloalkyl group in which one or two or more of —CH 2 — are replaced with —O—, —S—, —NH—, —N(CH 3 )—, —C(═O)—, —OC(═O)—, or —C(═O)O—, or any polymerizable group selected from the group consisting of the groups represented by Formulae (Q-1) to (Q-5).       

     The compound represented by Formula (I) also preferably has, for example, a structure represented by Formula (II-2). 
     
       
         
         
             
             
         
       
     
     In the formula, A 1  and A 2  each independently represent a phenylene group which may have a substituent or a trans-1,4-cyclohexylene group which may have a substituent, in which all of the substituents are each independently 1 to 4 substituents selected from the group consisting of an alkyl group, an alkoxy group, and —C(═O)—X 3 -Sp 3 -Q 3 ,
         L 1 , L 2 , and L 3  represent a single bond or a linking group selected from the group consisting of —CH 2 O—, —OCH 2 —, —(CH 2 ) 2 OC(═O)—, —C(═O)O(CH 2 ) 2 —, —C(═O)O—, —OC(═O)—, —OC(═O)O—, —CH═CH—C(═O)O—, and —OC(═O)—CH═CH—, and   n1 and n2 each independently represent an integer of 0 to 9, and n1+n2 is 9 or less.       

     The definitions of Q 1 , Q 2 , Sp 1 , and Sp 2  are the same as the definitions of each group in Formula (I) described above. The definitions of X 3 , Sp 3 , Q 3 , R 1 , and R 2  have the same meanings as the definitions of each group in Formula (II) described above. 
     As the liquid crystal compound used in the present invention, a compound represented by Formula (IV) and described in JP2014-198814A, particularly a polymerizable liquid crystal compound represented by Formula (IV) in which one (meth)acrylate group is included, is also suitably used. 
     
       
         
         
             
             
         
       
     
     In Formula (IV), A 1  represents an alkylene group having 2 to 18 carbon atoms, where, in the alkylene group, one CH 2  or two or more CH 2 &#39;s which are not adjacent to each other may be replaced with —O—,
         Z 1  represents —C(═O)—, —O—C(═O)—, or a single bond,   Z 2  represents —C(═O)— or C(═O)—CH═CH—,   R 1  represents a hydrogen atom or a methyl group,   R 2  represents a hydrogen atom, a halogen atom, a linear alkyl group having 1 to 4 carbon atoms, a methoxy group, an ethoxy group, a phenyl group which may have a substituent, a vinyl group, a formyl group, a nitro group, a cyano group, an acetyl group, an acetoxy group, an N-acetylamide group, an acryloylamino group, an N,N-dimethylamino group, a maleimide group, a methacryloylamino group, an allyloxy group, an allyloxycarbamoyl group, an N-alkyloxycarbamoyl group in which the alkyl group has 1 to 4 carbon atoms, an N-(2-methacryloyloxyethyl) carbamoyloxy group, an N-(2-acryloyloxyethyl) carbamoyloxy group, or a structure represented by Formula (IV-2), and   L 1 , L 2 , L 3 , and L 4  each independently represent an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an alkoxycarbonyl group having 2 to 5 carbon atoms, an acyl group having 2 to 4 carbon atoms, a halogen atom, or a hydrogen atom, in which at least one of L 1 , L 2 , L 3 , or L 4  represents a group other than the hydrogen atom.       

       —Z 5 -T-Sp-P  Formula (IV-2)
 
     In Formula (IV-2), P represents an acryloyl group, a methacryloyl group, or a hydrogen atom, Z 5  represents a single bond, —C(═O)O—, —OC(═O)—, —C(═O)NR 1 — (R 1  represents a hydrogen atom or a methyl group), —NR 1 C(═O)—, —C(═O)S—, or —SC(═O)—, T represents a 1,4-phenylene group, and Sp represents a divalent aliphatic group having 1 to 12 carbon atoms, which may have a substituent, where, in the aliphatic group, one CH 2  or two or more CH 2 &#39;s which are not adjacent to each other may be replaced with —O—, —S—, —OC(═O)—, —C(═O)O—, or OC(═O)O—. 
     The compound represented by Formula (IV) is preferably a compound represented by Formula (V). 
     
       
         
         
             
             
         
       
     
     In Formula (V), n1 represents an integer of 3 to 6, 
     R 11  represents a hydrogen atom or a methyl group, 
     Z 12  represents —C(═O)— or C(═O)—CH═CH—, and 
     R 12  represents a hydrogen atom, a linear alkyl group having 1 to 4 carbon atoms, a methoxy group, an ethoxy group, a phenyl group, an acryloylamino group, a methacryloylamino group, an allyloxy group, or a structure represented by Formula (IV-3). 
       —Z 51 -T-Sp-P Formula (IV-3)
 
     In Formula (IV-3), P represents an acryloyl group or a methacryloyl group, 
     Z 51  represents —C(═O)O— or —OC(═O)—, 
     T represents a 1,4-phenylene group, and 
     Sp represents a divalent aliphatic group having 2 to 6 carbon atoms, which may have a substituent. In the aliphatic group, one CH 2  or two or more CH 2 &#39;s which are not adjacent to each other may be replaced with —O—, —OC(═O)—, —C(═O)O—, or OC(═O)O—. 
     n1 represents an integer of 3 to 6, and is preferably 3 or 4.
         Z 12  represents —C(═O)— or C(═O)—CH═CH—, and preferably represents —C(═O)—.   R 12  represents a hydrogen atom, a linear alkyl group having 1 to 4 carbon atoms, a methoxy group, an ethoxy group, a phenyl group, an acryloylamino group, a methacryloylamino group, an allyloxy group, or the structure represented by Formula (IV-3), and preferably represents a methyl group, an ethyl group, a propyl group, a methoxy group, an ethoxy group, a phenyl group, and acryloylamino group, a methacryloylamino group, or the structure represented by Formula (IV-3), more preferably represents a methyl group, an ethyl group, a methoxy group, an ethoxy group, a phenyl group, an acryloylamino group, a methacryloylamino group, or the structure represented by Formula (IV-3).       

     As the liquid crystal compound used in the present invention, a compound represented by Formula (VI) and described in JP2014-198814A, particularly a liquid crystal compound represented by Formula (VI), which does not have a (meth)acrylate group, is also suitably used. 
     
       
         
         
             
             
         
       
     
     In Formula (VI), Z 3  represents —C(═O)— or CH═CH—C(═O)—, 
     Z 4  represents —C(═O)— or C(═O)—CH═CH—, 
     R 3  and R 4  each independently represent a hydrogen atom, a halogen atom, a linear alkyl group having 1 to 4 carbon atoms, a methoxy group, an ethoxy group, an aromatic ring which may have a substituent, a cyclohexyl group, a vinyl group, a formyl group, a nitro group, a cyano group, an acetyl group, an acetoxy group, an acryloylamino group, an N,N-dimethylamino group, a maleimide group, a methacryloylamino group, an allyloxy group, an allyloxycarbamoyl group, an N-alkyloxycarbamoyl group in which the alkyl group has 1 to carbon atoms, an N-(2-methacryloyloxyethyl) carbamoyloxy group, an N-(2-acryloyloxyethyl) carbamoyloxy group, or a structure represented by Formula (VI-2), and 
     L 5 , L 6 , L 7 , and L 8  each independently represent an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an alkoxycarbonyl group having 2 to 5 carbon atoms, an acyl group having 2 to 4 carbon atoms, a halogen atom, or a hydrogen atom, in which at least one of L 5 , L 6 , L 7 , or L 8  represents a group other than the hydrogen atom. 
       —Z 5 -T-Sp-P  Formula (VI-2)
 
     In Formula (VI-2), P represents an acryloyl group, a methacryloyl group, or a hydrogen atom, Z 5  represents —C(═O)O—, —OC(═O)—, —C(═O)NR 1 — (R 1  represents a hydrogen atom or a methyl group), —NR 1 C(═O)—, —C(═O)S—, or SC(═O)—, T represents a 1,4-phenylene group, and Sp represents a divalent aliphatic group having 1 to 12 carbon atoms, which may have a substituent. However, in the aliphatic group, one CH 2  or two or more CH 2 &#39;s which are not adjacent to each other may be replaced with —O—, —S—, —OC(═O)—, —C(═O)O—, or OC(═O)O—. 
     The compound represented by Formula (VI) is preferably a compound represented by Formula (VII). 
     
       
         
         
             
             
         
       
     
     In Formula (VII), Z 13  represents —C(═O)— or C(═O)—CH═CH—,
         Z 14  represents —C(═O)— or CH═CH—C(═O)—,   R 13  and V each independently represent a hydrogen atom, a linear alkyl group having 1 to 4 carbon atoms, a methoxy group, an ethoxy group, a phenyl group, an acryloylamino group, a methacryloylamino group, an allyloxy group, or the structure represented by Formula (IV-3) described above.       

     Z 13  represents —C(═O)— or C(═O)—CH═CH—, and is preferably —C(═O)—.
         R 13  and R 14  each independently represent a hydrogen atom, a linear alkyl group having 1 to 4 carbon atoms, a methoxy group, an ethoxy group, a phenyl group, an acryloylamino group, a methacryloylamino group, an allyloxy group, or the structure represented by Formula (IV-3) described above, and preferably represents a methyl group, an ethyl group, a propyl group, a methoxy group, an ethoxy group, a phenyl group, and acryloylamino group, a methacryloylamino group, or the structure represented by Formula (IV-3) described above, more preferably represents a methyl group, an ethyl group, a methoxy group, an ethoxy group, a phenyl group, an acryloylamino group, a methacryloylamino group, or the structure represented by Formula (IV-3) described above.       

     As the liquid crystal compound used in the present invention, a compound represented by Formula (VIII) and described in JP2014-198814A, particularly a polymerizable liquid crystal compound represented by Formula (VIII) in which two (meth)acrylate groups are included, is also suitably used. 
     
       
         
         
             
             
         
       
     
     In Formula (VIII), A 2  and A 3  each independently represent an alkylene group having 2 to 18 carbon atoms, where, in the alkylene group, one CH 2  or two or more CH 2 &#39;s which are not adjacent to each other may be replaced with —O—,
         Z 5  represents —C(═O)—, —OC(═O)—, or a single bond,   Z 6  represents —C(═O)—, —C(═O)O—, or a single bond,   R 5  and R 6  each independently represent a hydrogen atom or a methyl group, and   L 9 , L 10 , L 11 , and L 12  each independently represent an alkyl group having 1 to 4 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, an alkoxycarbonyl group having 2 to 5 carbon atoms, an acyl group having 2 to 4 carbon atoms, a halogen atom, or a hydrogen atom, in which at least one of L 9 , L 10 , L 11 , or L 12  represents a group other than the hydrogen atom.       

     The compound represented by Formula (VIII) is preferably a compound represented by Formula (IX). 
     
       
         
         
             
             
         
       
     
     In Formula (IX), n2 and n3 each independently represent an integer of 3 to 6, and
         R 15  and R 16  each independently represent a hydrogen atom or a methyl group.       

     In Formula (IX), n2 and n3 each independently represent an integer of 3 to 6, and are preferably 4. 
     In Formula (IX), R 15  and R 16  each independently represent a hydrogen atom or a methyl group, preferably represent a hydrogen atom. 
     These liquid crystal compounds can be produced by a known method. 
     In order to obtain the composition layer satisfying Requirement 1 or Requirement 2 described above, it is preferable to use a liquid crystal compound having a large pretilt angle at the interface.
         Chiral agent X in which helical twisting power changes due to irradiation with light       

     The chiral agent X is a compound which induces the helix of the liquid crystal compound, and is not particularly limited as long as it is a chiral agent in which the helical twisting power (HTP) changes due to irradiation with light. 
     In addition, the chiral agent X may be liquid crystalline or non-liquid crystalline. In general, the chiral agent X includes an asymmetric carbon atom. However, an axially asymmetric compound or a surface asymmetric compound not having the asymmetric carbon atom can also be used as the chiral agent X. The chiral agent X may include a polymerizable group. 
     Examples of the chiral agent X include so-called photoreactive chiral agents. The photoreactive chiral agent is a compound which has a chiral site and has a photoreactive site in which structure changes due to irradiation with light, and for example, which greatly changes the twisting power of the liquid crystal compound according to the amount of light irradiated. 
     Examples of the photoreactive site in which structure changes due to irradiation with light include photochromic compounds (Kingo Uchida and Masahiro Irie, Chemical Industry, vol. 64, p. 640, 1999, and Kingo Uchida and Masahiro Irie, Fine Chemical, vol. 28(9), p. 15, 1999). In addition, the above-described structural change means decomposition, addition reaction, isomerization, dimerization reaction, and the like, which are caused by irradiation of the photoreactive site with light, and the structural change may be irreversible. In addition, the chiral site corresponds to, for example, the asymmetric carbon described in Hiroyuki Nohira, Chemical Review, No. 22, Chemistry of Liquid Crystals, p. 73, 1994. 
     Examples of the above-described photoreactive chiral agent include photoreactive chiral agents described in paragraphs 0044 to 0047 of JP2001-159709A, optically active compounds described in paragraphs 0019 to 0043 of JP2002-179669A, optically active compounds described in paragraphs 0020 to 0044 of JP2002-179633A, optically active compounds described in paragraphs 0016 to 0040 of JP2002-179670A, optically active compounds described in paragraphs 0017 to 0050 of JP2002-179668A, optically active compounds described in paragraphs 0018 to 0044 of JP2002-180051A, optically active compounds described in paragraphs 0016 to 0055 of JP2002-338575A, and optically active compounds described in paragraphs 0020 to 0049 of JP2002-179682A. 
     Among these, the chiral agent X is preferably a compound having at least one photoisomerization site. As the above-described photoisomerization site, from the viewpoint that absorption of visible light is small, photoisomerization is likely to occur, and difference in helical twisting power before and after irradiation with light is large, a cinnamoyl site, a chalcone site, an azobenzene site, a stilbene site, or a coumarin site is preferable, and a cinnamoyl site or a chalcone site is more preferable. The photoisomerization site corresponds to the above-described photoreactive site in which structure changes due to irradiation with light. 
     In addition, from the viewpoint that the difference in helical twisting power before and after irradiation with light is large, the chiral agent X is preferably an isosorbide-based optically active compound, an isomannide-based optical compound, or a binaphthol-based optically active compound. That is, the chiral agent X preferably has, as the above-described chiral site, an isosorbide skeleton, an isomannide skeleton, or a binaphthol skeleton. Among these, from the viewpoint that the difference in helical twisting power before and after irradiation with light is larger, as the chiral agent X, an isosorbide-based optically active compound or a binaphthol-based optically active compound is more preferable, and an isosorbide-based optically active compound is still more preferable. 
     The helical pitch of the cholesteric liquid crystalline phase largely depends on the type of the chiral agent X and the concentration thereof added, a desired pitch can be obtained by adjusting these. 
     The chiral agent X may be used alone or in combination of a plurality of kinds thereof. 
     The total content of chiral agents in the composition X (total content of all chiral agents in the composition X) is preferably 2.0 mass % or more and more preferably 3.0 mass % or more with respect to the total mass of the liquid crystal compound. In addition, from the viewpoint of suppressing haze of the inclined cholesteric liquid crystal layer, the upper limit of the total content of chiral agents in the composition X is preferably 15.0 mass % or less and more preferably 12.0 mass % or less with respect to the total mass of the liquid crystal compound. 
     Arbitrary Component 
     The composition X may include other components in addition to the liquid crystal compound and the chiral agent X. 
     Chiral Agent XA 
     The chiral agent XA is a compound which induces the helix of the liquid crystal compound, and is preferably a chiral agent in which the helical twisting power (HTP) does not change due to irradiation with light. 
     In addition, the chiral agent XA may be liquid crystalline or non-liquid crystalline. In general, the chiral agent XA includes an asymmetric carbon atom. However, an axially asymmetric compound or a surface asymmetric compound not having the asymmetric carbon atom can also be used as the chiral agent XA. The chiral agent XA may include a polymerizable group. 
     As the chiral agent XA, a known chiral agent can be used. 
     In a case where the liquid crystal composition includes the chiral agent X alone, and a case where the chiral agent X has a helical twisting power exceeding a predetermined range (for example, 0.0 to 1.9 μm −1 ) in the state of non-light irradiation treatment, the chiral agent XA is preferably a chiral agent which induces a helix in the opposite orientation to the above-described chiral agent X. That is, for example, in a case where the helix induced by the chiral agent X is right-handed, the helix induced by the chiral agent XA is left-handed. 
     In addition, in a case where the liquid crystal composition includes a plurality of kinds of chiral agents X as the chiral agent, and a case where the weighted-average helical twisting power thereof in the state of non-light irradiation treatment exceeds the above-described predetermined range, the chiral agent XA is preferably a chiral agent which induces a helix in the direction opposite to the weighted-average helical twisting power. 
     Polymerization Initiator 
     The composition X may include a polymerization initiator. In particular, in a case where the liquid crystal compound has a polymerizable group, it is preferable that the composition X includes a polymerization initiator. 
     Examples of the polymerization initiator include the same polymerization initiators which can be included in the liquid crystal layer. The polymerization initiator which can be included in the liquid crystal layer is as described above. 
     The content (in a case where a plurality of kinds of polymerization initiators are included, the total content thereof) of the polymerization initiator in the composition X is not particularly limited, but is preferably 0.1 to 20 mass % and more preferably 1.0 to 8.0 mass % with respect to the total mass of the liquid crystal compound. 
     Surfactant 
     The composition X may include a surfactant which can be unevenly distributed on the surface of the composition layer on the inclined alignment surface  102   a  side and/or the surface of the composition layer opposite to the inclined alignment surface  102   a.    
     In a case where the composition X includes a surfactant, it is easy to obtain a composition layer satisfying Requirement 1 or Requirement 2 described above, and it is possible to stably or rapidly form a cholesteric liquid crystalline phase. 
     Examples of the surfactant include the same surfactants which can be included in the liquid crystal layer. The surfactant which can be included in the liquid crystal layer is as described above. 
     Among these, the composition X preferably includes a surfactant (for example, onium salt compounds (described in JP2012-208397A)) capable of controlling, in the composition layer formed in the step 2X-1, the inclination angle (see  FIG. 16 ) of the molecular axis L 1  of the liquid crystal compound  14  with respect to the inclined alignment surface  102   a  in the surface on the inclined alignment surface  102   a  side, or a surfactant (for example, a polymer having a perfluoroalkyl group in the side chain) capable of controlling the inclination angle (see  FIG. 16 ) of the molecular axis L 1  of the liquid crystal compound  14  with respect to the inclined alignment surface  102   a  in the surface opposite to the inclined alignment surface  102   a  side. In addition, in a case where the composition X includes the above-described surfactant, the obtained inclined cholesteric liquid crystal layer also has the advantage of low haze. 
     The surfactant may be used alone or in combination of two or more kinds thereof. 
     The content (in a case where a plurality of kinds of surfactants are included, the total content thereof) of the surfactant in the composition X is not particularly limited, but is preferably 0.01 to 10 mass %, more preferably 0.01 to 5.0 mass %, and still more preferably 0.01 to 2.0 mass % with respect to the total mass of the liquid crystal compound. 
     Solvent 
     The composition X may include a solvent. 
     Examples of the solvent include the same solvents which can be included in the liquid crystal layer. The solvent which can be included in the liquid crystal layer is as described above. 
     Other Additives 
     The composition X may include other additives such as one or two or more kinds of antioxidants, ultraviolet absorbers, sensitizers, stabilizers, plasticizers, chain transfer agents, polymerization inhibitors, anti-foaming agents, leveling agents, thickeners, flame retardants, surface active substances, dispersants, and colorants such as a dye and a pigment. 
     It is preferable that one or more of the compounds constituting the composition X are compounds (polyfunctional compounds) having a plurality of polymerizable groups. Furthermore, in the composition X, it is preferable that the total content of compounds having a plurality of polymerizable groups is 80 mass % or more with respect to the total solid content of the composition X. The above-described solid content includes component forming the inclined cholesteric liquid crystal layer, and does not include the solvent. 
     In a case where 80 mass % or more of the total solid content of the composition X is a compound having a plurality of polymerizable groups, durability can be imparted by firmly immobilizing the structure of the cholesteric liquid crystalline phase, which is preferable. 
     The compound having a plurality of polymerizable groups is a compound having two or more immobilizable groups in one molecule. In the present invention, the polyfunctional compound included in the composition X may have liquid crystallinity or may not have liquid crystallinity. 
     &lt;&lt;&lt;&lt;Procedure of Step 2X-1&gt;&gt;&gt;&gt; 
     The step 2X-1 preferably has the following step 2X-1-1 and the following step 2X-1-2. 
     Step 2X-1-1: step of forming a coating film on the above-described liquid crystal layer by bringing the composition X into contact with the above-described liquid crystal layer 
     Step 2X-1-2: step of forming a composition layer satisfying Requirement 1 or Requirement 2 described above by heating the above-described coating film 
     Step 2X-1-1: Coating Film Forming Step 
     In the step 2X-1-1, first, the above-described composition X is applied to the liquid crystal layer. The coating method is not particularly limited, and examples thereof include a wire bar coating method, an extrusion coating method, a direct gravure coating method, a reverse gravure coating method, and a die-coating method. Prior to the application of the composition X, the above-described liquid crystal layer may be subjected to a known rubbing treatment. 
     After the application of the composition X, a treatment of drying the coating film applied to the above-described liquid crystal layer may be performed as necessary. By performing the drying treatment, the solvent can be removed from the coating film. 
     The thickness of the coating film is not particularly limited, but from the viewpoint that reflection anisotropy and haze of the inclined cholesteric liquid crystal layer is better, is preferably 0.1 to 20 μm, more preferably 0.2 to 15 μm, and still more preferably 0.5 to 10 μm. 
     Step 2X-1-2: Composition Layer Forming Step 
     From the viewpoint of manufacturing suitability, the liquid crystal phase transition temperature of the composition X is preferably in a range of 10° C. to 250° C. and more preferably in a range of 10° to 150° C. 
     As a preferred heating condition, it is preferable to heat the composition layer at 40° C. to 100° C. (preferably 60° C. to 100° C.) for 0.5 to 5 minutes (preferably 0.5 to 2 minutes). 
     In a case of heating the composition layer, it is preferable that the composition layer is not heated to a temperature at which the liquid crystal compound exhibits an isotropic phase (Iso). In a case where the composition layer is heated to equal to or higher than a temperature at which the liquid crystal compound exhibits an isotropic phase, defects in the inclined and aligned liquid crystal phase or the hybrid-aligned liquid crystal phase increase, which is not preferable. 
     By the above-described step 2X-1-2, a composition layer satisfying Requirement 1 or Requirement 2 described above is obtained. 
     In order to incline and align, or hybrid-align the liquid crystal compound, it is effective to give a pretilt angle to the interface, and specific examples thereof include the following methods. 
     (1) alignment control agent is added in the composition X to control the alignment of the liquid crystal compound by being unevenly distributed at the air interface and/or the liquid crystal layer interface. 
     (2) as a liquid crystal compound, a liquid crystalline compound having a large pretilt angle at the interface is added in the composition X. 
     &lt;&lt;Step 2X-2&gt;&gt; 
     Step 2X-2 is a step of forming an inclined cholesteric liquid crystal layer by performing a light irradiation treatment to the composition layer obtained in the step 2X-1 so as to change the helical twisting power of the chiral agent X and to cholesterically align the liquid crystal compound in the composition layer. 
     By dividing the light irradiation area into a plurality of domains and adjusting the amount of light irradiated for each domain, areas having different helical pitches (areas having different selective reflection wavelengths) can be further formed. 
     The irradiation intensity of light irradiation in the step 2X-2 is not particularly limited, and can be appropriately determined based on the helical twisting power of the chiral agent X. In general, the irradiation intensity of light irradiation in the step 2X-2 is preferably approximately 0.1 to 200 mW/cm 2 . In addition, the time for irradiation with light is not particularly limited, but may be appropriately determined from the viewpoint of both the sufficient strength and productivity of the layer to be obtained. 
     In addition, the temperature of the composition layer in a case of light irradiation is, for example, 0° to 100° C., preferably 10° C. to 60° C. 
     The light used for light irradiation is not particularly limited as long as it is an actinic ray or radiation, which changes the helical twisting power of the chiral agent X, and means, for example, a bright line spectrum of a mercury lamp, far ultraviolet rays typified by an excimer laser, extreme ultraviolet rays (EUV light), X-rays, ultraviolet rays, electron beam (EB), and the like. Among these, ultraviolet rays are preferable. 
     Here, in the method for manufacturing the inclined cholesteric liquid crystal layer described above, in a case where the composition layer is exposed to the wind, the surface of the inclined cholesteric liquid crystal layer to be formed may be uneven. In consideration of this point, in all steps of the step 2X in the method for manufacturing the inclined cholesteric liquid crystal layer described above, it is preferable that the wind speed of the environment to which the composition layer is exposed is low. Specifically, in all steps of the step 2X in the method for manufacturing the inclined cholesteric liquid crystal layer described above, the wind speed of the environment to which the composition layer is preferably exposed is 1 m/s or less. 
     &lt;&lt;Curing Treatment&gt;&gt; 
     In a case where the liquid crystal compound has a polymerizable group, it is preferable that a curing treatment is performed on the composition layer. Examples of the procedure for subjecting the composition layer to the curing treatment include (1) and (2) shown below. 
     (1) in a case of the step 2X-2, a curing treatment is performed to immobilize the cholesteric alignment state, so as to form an inclined cholesteric liquid crystal layer in which the cholesteric alignment state is immobilized (that is, the curing treatment is performed at the step 2X-2), or 
     (2) after the step 2X-2, a step 3X is further included by performing a curing treatment to immobilize the cholesteric alignment state, so as to form an inclined cholesteric liquid crystal layer in which the cholesteric alignment state is immobilized. 
     That is, the inclined cholesteric liquid crystal layer obtained by performing the curing treatment corresponds to a layer obtained by immobilizing the cholesteric liquid crystalline phase. 
     Here, in the state of the “immobilized” cholesteric liquid crystalline phase, a state in which the alignment of the liquid crystal compound as the cholesteric liquid crystalline phase is maintained is the most typical and preferred aspect. The state is not limited thereto, and specifically, it means that, in a temperature range of usually 0° C. to 50° C. and under more severe conditions in a temperature range of −30° C. to 70° C., a state in which the layer has no fluidity and the immobilized alignment form can be maintained stably without causing a change in alignment form due to an external field or an external force. In the present invention, as described later, it is preferable to immobilize the alignment state of the cholesteric liquid crystalline phase by a curing reaction which proceeds by irradiation with ultraviolet rays. 
     In the layer obtained by immobilizing the cholesteric liquid crystalline phase, it is sufficient that the optical properties of the cholesteric liquid crystalline phase are retained in the layer, and the composition in the layer no longer needs to exhibit liquid crystallinity at last. 
     The method of the curing treatment is not particularly limited, and examples thereof include photo-curing treatment and thermosetting treatment. Among these, a light irradiation treatment is preferable and an ultraviolet irradiation treatment is more preferable. In addition, as described above, it is preferable that the liquid crystal compound is a liquid crystal compound having a polymerizable group. In a case where the liquid crystal compound has a polymerizable group, the curing treatment is preferably a polymerization reaction by light irradiation (particularly ultraviolet irradiation), and more preferably a radical polymerization reaction by light irradiation (particularly ultraviolet irradiation). 
     A light source such as an ultraviolet lamp is used for the ultraviolet irradiation. 
     The irradiation energy amount of the ultraviolet rays is not particularly limited, but generally, is preferably approximately 100 to 800 mJ/cm 2 . The time for irradiation with ultraviolet rays is not particularly limited, but may be appropriately determined from the viewpoint of both the sufficient strength and productivity of the layer to be obtained. 
     (Aspect of Using Liquid Crystal Composition Including Chiral Agent Y) 
     Hereinafter, the method (hereinafter, also referred to as a “step 2Y”) for manufacturing the inclined cholesteric liquid crystal layer using a liquid crystal composition including the chiral agent Y will be described. 
     The manufacturing method 2Y has at least the following steps 2Y-1 and 2Y-2. 
     Step 2Y-1: step of forming a composition layer satisfying Requirement 1 or Requirement 2 on the above-described liquid crystal layer using a liquid crystal composition including the chiral agent Y and a liquid crystal compound 
     Step 2Y-2: step of forming an inclined cholesteric liquid crystal layer by performing a cooling treatment or a heating treatment to the above-described composition layer so as to cholesterically align the above-described liquid crystal compound in the above-described composition layer 
     Requirement 1: at least a part of the above-described liquid crystal compound in the above-described composition layer is inclined and aligned with respect to the surface of the above-described composition layer. 
     Requirement 2: above-described liquid crystal compound is aligned such that a tilt angle of the above-described liquid crystal compound in the above-described composition layer changes consecutively along the thickness direction. 
     In addition, in a case where the liquid crystal compound has a polymerizable group, in the step 2Y, it is preferable that a curing treatment is performed on the composition layer as described later. 
     Hereinafter, the materials used in each step, and the procedure of each step will be described in detail. 
     &lt;&lt;Step 2Y-1&gt;&gt; 
     Step 2Y-1 is a step of forming a composition layer satisfying Requirement 1 or Requirement 2 described above on the liquid crystal layer using a liquid crystal composition (hereinafter, also referred to as a “composition Y”) including the chiral agent Y and a liquid crystal compound. 
     In the step 2Y-1, the procedure of all steps is the same as that in the step 2X-1 described above, except that the composition Y is used instead of the composition X, and the description thereof will be omitted. 
     &lt;&lt;&lt;&lt;Composition Y&gt;&gt;&gt;&gt; 
     The composition Y includes a liquid crystal compound and a chiral agent Y in which the helical twisting power changes due to change in temperature. Hereinafter, each component will be described. 
     As described above, from the viewpoint that the composition layer is easily formed at the temperature T 11  at which the alignment treatment of the liquid crystal compound is performed in the step 2Y-1 for forming the composition layer satisfying Requirement 1 or Requirement 2 described above, the absolute value of the weighted-average helical twisting power of chiral agents in the composition layer is, for example, 0.0 to 1.9 μm −1 , preferably 0.0 to 1.5 μm −1 , more preferably 0.0 to 0.5 μm −1 , and particularly preferably 0. Therefore, in a case where the chiral agent Y has a helical twisting power exceeding the above-described predetermined range at the temperature T 11 , it is preferable that the composition Y includes a chiral agent (hereinafter, also referred to as a “chiral agent YA”) which induces a helix in the opposite direction to the chiral agent Y at the temperature T 11 , so that the helical twisting power of the chiral agent Y is offset to approximately 0 in the step 2Y-1 (that is, the weighted-average helical twisting power of chiral agents in the composition layer is within the above-described predetermined range). It is preferable that the chiral agent YA does not change the helical twisting power due to change in temperature. 
     In addition, in a case where the liquid crystal composition includes, as the chiral agent, a plurality of kinds of chiral agents Y, and where the weighted-average helical twisting power of the plurality of kinds of chiral agents Y at the temperature T 11  has a helical twisting power outside the above-described predetermined range, the “other chiral agents YA which induce a helix in the opposite direction to the chiral agent Y” are intended to be a chiral agent which induces a helix in the opposite direction to the weighted-average helical twisting power of the above-described plurality of kinds of chiral agents Y. 
     In a case where the chiral agent Y alone does not have the helical twisting power at the temperature T 11  and has a property of increasing the helical twisting power due to change in temperature, the chiral agent YA may not be used in combination. 
     Hereinafter, various materials included in the composition Y will be described. Among the materials included in the composition Y, components other than the chiral agent are the same as the materials included in the composition X, and thus the description thereof will be omitted. 
     Chiral Agent Y in which Helical Twisting Power Changes Due to Cooling or Heating 
     The chiral agent Y is a compound which induces the helix of the liquid crystal compound, and is not particularly limited as long as it is a chiral agent in which the helical twisting power increases due to cooling or heating. The term “cooling or heating” means the cooling treatment or heating treatment performed in the step 2Y-1. In addition, the upper limit of the cooling or heating temperature is usually approximately ±150° C. (in other words, a chiral agent in which the helical twisting power increases by cooling or heating within ±150° C. is preferable). Among these, a chiral agent in which the helical twisting power increases by cooling is preferable. 
     The chiral agent Y may be liquid crystalline or non-liquid crystalline. The chiral agent can be selected from various known chiral agents (for example, a chiral agent for twisted nematic (TN) and super twisted nematic (STN), described in Liquid Crystal Device Handbook, Chapter 3, Section 4-3, p. 199, Japan Society for the Promotion of Science edited by the 142nd committee, 1989). In general, the chiral agent Y includes an asymmetric carbon atom. However, an axially asymmetric compound or a surface asymmetric compound not having the asymmetric carbon atom can also be used as the chiral agent Y. Examples of the axially asymmetric compound or the surface asymmetric compound include binaphthyl, helicene, paracyclophane, and derivatives thereof. The chiral agent Y may include a polymerizable group. 
     Among these, from the viewpoint that the difference in helical twisting power after change in temperature is large, as the chiral agent Y, an isosorbide-based optically active compound, an isomannide-based optically active compound, or a binaphthol-based optically active compound is preferable, and a binaphthol-based optically active compound is more preferable. 
     The total content of chiral agents in the composition Y (total content of all chiral agents in the composition Y) is preferably 2.0 mass % or more and more preferably 3.0 mass % or more with respect to the total mass of the liquid crystal compound. In addition, from the viewpoint of suppressing haze of the inclined cholesteric liquid crystal layer, the upper limit of the total content of chiral agents in the composition Y is preferably 15.0 mass % or less and more preferably 12.0 mass % or less with respect to the total mass of the liquid crystal compound. 
     As the amount of the chiral agent Y to be used is smaller, the chiral agent Y tends not to affect liquid crystallinity, which is preferable. Therefore, the above-described chiral agent Y is preferably a compound having a strong twisting power, so that a desired twisted alignment of a helical pitch can be achieved even in a small amount. 
     Chiral Agent YA 
     The chiral agent YA is a compound which induces the helix of the liquid crystal compound, and is preferably a chiral agent in which the helical twisting power (HTP) does not change due to change in temperature. 
     In addition, the chiral agent YA may be liquid crystalline or non-liquid crystalline. In general, the chiral agent YA includes an asymmetric carbon atom. However, an axially asymmetric compound or a surface asymmetric compound not having the asymmetric carbon atom can also be used as the chiral agent YA. The chiral agent YA may include a polymerizable group. 
     As the chiral agent YA, a known chiral agent can be used. 
     In a case where the liquid crystal composition includes the chiral agent Y alone, and a case where the chiral agent Y has a helical twisting power exceeding a predetermined range (for example, 0.0 to 1.9 μm −1 ) at the temperature T 11 , the chiral agent YA is preferably a chiral agent which induces a helix in the opposite orientation to the above-described chiral agent Y. That is, for example, in a case where the helix induced by the chiral agent Y is right-handed, the helix induced by the chiral agent YA is left-handed. 
     In addition, in a case where the liquid crystal composition includes a plurality of kinds of chiral agents Y as the chiral agent, and a case where the weighted-average helical twisting power thereof at the temperature T 11  exceeds the above-described predetermined range, the chiral agent YA is preferably a chiral agent which induces a helix in the direction opposite to the weighted-average helical twisting power. 
     &lt;&lt;Step 2Y-2&gt;&gt; 
     Step 2Y-2 is a step of forming an inclined cholesteric liquid crystal layer by performing a cooling treatment or a heating treatment to the composition layer obtained in the step 2Y-1 so as to change the helical twisting power of the chiral agent Y and to cholesterically align the liquid crystal compound in the composition layer. Among these, in this step, it is preferable to cool the composition layer. 
     From the viewpoint that reflection anisotropy of the inclined cholesteric liquid crystal layer is more excellent, in a case of cooling the composition layer, it is preferable to cool the composition layer so that the temperature of the composition layer is lowered by 30° C. or higher. Among these, from the viewpoint that the above-described effect is more excellent, it is preferable to cool the composition layer so that the temperature of the composition layer is lowered by 40° C. or higher, and it is more preferable to cool the composition layer so that the temperature of the composition layer is lowered by 50° C. or higher. The upper limit value of the reduced temperature range of the above-described cooling treatment is not particularly limited, but is usually approximately 150° C. 
     In other words, the above-described cooling treatment is intended that, in a case where the temperature of the composition layer satisfying Requirement 1 or Requirement 2 described above, which is obtained in the step 1 before cooling, is defined as T° C., the composition layer is cooled to T−30° C. or lower (that is, in a case of the aspect shown in  FIG. 21 , T 12 ≤T 11 −30° C.). 
     The cooling method is not particularly limited, and examples thereof include a method of allowing the liquid crystal layer on which the composition layer is disposed to stand in an atmosphere of a predetermined temperature. 
     The cooling rate in the cooling treatment is not limited, but from the viewpoint that reflection anisotropy of the inclined cholesteric liquid crystal layer is more excellent, it is preferable that the cooling rate is set to a certain rate. 
     Specifically, the maximum value of the cooling rate in the cooling treatment is preferably 1° C. or higher per second, more preferably 2° C. or higher per second, and still more preferably 3° C. or higher per second. The upper limit of the cooling rate is not particularly limited, but is usually 10° C. or lower per second. 
     Here, in the method for manufacturing the inclined cholesteric liquid crystal layer described above, in a case where the composition layer is exposed to the wind, the surface of the inclined cholesteric liquid crystal layer to be formed may be uneven. In consideration of this point, in all steps of the step 2Y in the method for manufacturing the inclined cholesteric liquid crystal layer described above, it is preferable that the wind speed of the environment to which the composition layer is exposed is low. Specifically, in all steps of the step 2Y in the method for manufacturing the inclined cholesteric liquid crystal layer described above, the wind speed of the environment to which the composition layer is exposed is preferably 1 m/s or less. 
     In a case of heating the composition layer, the upper limit value of the increased temperature range of the heating treatment is not particularly limited, but is usually approximately 150° C. 
     &lt;&lt;Curing Treatment&gt;&gt; 
     In a case where the liquid crystal compound has a polymerizable group, it is preferable that a curing treatment is performed on the composition layer. The procedure for performing the curing treatment on the composition layer is the same as the method described in the manufacturing method 2X, and the suitable aspect is also the same. 
     &lt;&lt;Other Aspects of Method for Manufacturing Inclined Cholesteric Liquid Crystal Layer&gt;&gt; 
     Examples of another manufacturing method for manufacturing the inclined cholesteric liquid crystal layer used in the present invention include a method of using an alignment film in which a pattern is formed so as to arrange the liquid crystal compound in the inclined cholesteric liquid crystal layer, as a base layer in a case of forming the inclined cholesteric liquid crystal layer, to the above-described liquid crystal alignment pattern. 
     By forming the alignment film on the support, applying the composition to the alignment film, and curing the composition, it is possible to obtain an inclined cholesteric liquid crystal layer which is formed of a cured layer of the liquid crystal composition and in which a predetermined liquid crystal alignment pattern is immobilized. 
     As the support, a transparent support is preferable, and the same transparent substrate as described above can be used. 
     &lt;&lt;Alignment Film&gt;&gt; 
     As the alignment film, a so-called photo-alignment film obtained by irradiating a photo-alignable material with polarized light or non-polarized light can also be used. That is, the photo-alignment film may be produced by applying the photo-alignable material to the support. The irradiation of polarized light can be performed in a direction perpendicular or oblique to the photo-alignment film, and the irradiation of non-polarized light can be performed in a direction oblique to the photo-alignment film. In particular, in a case of irradiation from an oblique direction, a pretilt angle can be imparted to the liquid crystal. 
     Preferable examples of the photo-alignable material used in the photo-alignment film which can be used in the present invention include azo compounds described in JP2006-285197A, JP2007-076839A, JP2007-138138A, JP2007-094071A, JP2007-121721A, JP2007-140465A, JP2007-156439A, JP2007-133184A, JP2009-109831A, JP3883848B, and JP4151746B, aromatic ester compounds described in JP2002-229039A, maleimide- and/or alkenyl-substituted nadiimide compounds having a photo-alignable unit described in JP2002-265541A and JP2002-317013A, photo-crosslinking silane derivatives described in JP4205195B and JP4205198B, photo-crosslinking polyimide, polyamide, or ester described in JP2003-520878A, JP2004-529220A, and JP4162850B, and photo-dimerizable compounds, in particular, cinnamate compounds, chalcone compounds, or coumarin compounds described in JP1997-118717A (JP-H09-118717A), JP1998-506420A (JP-H10-506420A), JP2003-505561A, WO2010/150748A, JP2013-177561A, and JP2014-012823A. Among these, an azo compound, a photo-crosslinking polyimide, polyamide, or ester, a cinnamate compound, or a chalcone compound is particularly preferable. 
     After the alignment film is applied to the support and dried, the alignment film is exposed to laser to form the alignment pattern.  FIG. 23  is a schematic diagram illustrating an exposure apparatus for the alignment film. An exposure apparatus  61  includes a light source  64  including a laser  62  and a λ/2 plate  65 , a polarization beam splitter  68  splitting laser light M emitted from the laser  62  (light source  64 ) into two beams, mirrors  70 A and  70 B respectively disposed on optical paths of split two beams MA and MB, and λ/4 plates  72 A and  72 B. The λ/4 plates  72 A and  72 B have optical axes perpendicular to each other, the λ/4 plate  72 A converts linearly polarized light P 0  into right-handed circular polarization P R , and the λ/4 plate  72 B converts the linearly polarized light P 0  into left-handed circular polarization P L . 
     The light source  64  has the λ/2 plate  65 , and the linearly polarized light P 0  is emitted by changing the polarization direction of the laser light M emitted by the laser  62 . The λ/4 plate  72 A converts the linearly polarized light P 0  (beam MA) into right-handed circular polarization P R , and the λ/4 plate  72 B converts the linearly polarized light P 0  (beam MB) into left-handed circular polarization P L . 
     A support  52  including an alignment film  54  before the alignment pattern is formed is disposed on an exposed portion, the two beams MA and MB intersect and interfere with each other on the alignment film  54 , and the alignment film  54  is irradiated with the interference light to be exposed. Due to the interference at this time, the polarization state of light with which the alignment film  54  is irradiated periodically changes according to interference fringes. As a result, an alignment film  54  (hereinafter, also referred to as a pattern alignment film) having an alignment pattern in which the alignment state changes periodically is obtained. In the exposure apparatus  61 , by changing an intersecting angle α between the two beams MA and MB, the pitch of the alignment pattern can be changed. By forming the optically anisotropic layer described later on the pattern alignment film having an alignment pattern in which the alignment state changes periodically, an inclined cholesteric liquid crystal layer including a liquid crystal alignment pattern corresponding to this period can be formed. 
     In addition, by rotating the optical axes of the λ/4 plates  72 A and  72 B by 90° respectively, the direction of rotation of the optical axis of the liquid crystal compound in the liquid crystal alignment pattern can be reversed. 
     As described above, the pattern alignment film has an alignment pattern which aligns the liquid crystal compound, such that the orientation of the optical axis of the liquid crystal compound in the inclined cholesteric liquid crystal layer formed on the pattern alignment film changes consecutively while rotating over at least one direction in the plane to form a liquid crystal alignment pattern. Assuming that the axis along the orientation in which the liquid crystal compound is aligned is an alignment axis, it can be said that the pattern alignment film has an alignment pattern in which the orientation of the alignment axis changes consecutively while rotating over at least one direction in the plane. The alignment axis of the pattern alignment film can be detected by measuring absorption anisotropy. For example, in a case where the pattern alignment film is irradiated with linearly polarized light while rotating the pattern alignment film and the amount of light transmitted through the pattern alignment film is measured, the orientation in which the amount of light is maximum or minimum is observed by gradually changing over one direction in the plane. 
     &lt;&lt;Formation of Inclined Cholesteric Liquid Crystal Layer&gt;&gt; 
     The inclined cholesteric liquid crystal layer can be formed by applying multiple layers of the liquid crystal composition to the pattern alignment film. The application of the multiple layers refers to repetition of the following processes: producing a first liquid crystal immobilized layer by applying the liquid crystal composition to the alignment film, heating the liquid crystal composition, cooling the liquid crystal composition, and irradiating the liquid crystal composition with ultraviolet rays for curing; and producing a second or subsequent liquid crystal immobilized layer by applying the liquid crystal composition to the liquid crystal immobilized layer, heating the liquid crystal composition, cooling the liquid crystal composition, and irradiating the liquid crystal composition with ultraviolet rays for curing as described above. Even in a case where the inclined cholesteric liquid crystal layer is formed by the application of the multiple layers such that the total thickness of the inclined cholesteric liquid crystal layer is increased, the alignment direction of the alignment film can be reflected from a lower surface of the inclined cholesteric liquid crystal layer to an upper surface thereof. 
     As the liquid crystal compound included in the liquid crystal composition in the present manufacturing method, the above-described rod-like liquid crystal compound and disk-like liquid crystal compound can be used. 
     The chiral agent included in the liquid crystal composition in the present manufacturing method is not particularly limited, and depending on the purpose, a known compound (for example, a chiral agent for twisted nematic (TN) and super twisted nematic (STN), described in Liquid Crystal Device Handbook, Chapter 3, Section 4-3, p. 199, Japan Society for the Promotion of Science edited by the 142nd committee, 1989), an isosorbide derivative, an isomannide derivative, and the like can be used. 
     In addition, the liquid crystal composition in the present manufacturing method may include a polymerization initiator, a cross-linking agent, an alignment control agent, and the like, and as necessary, may further include a polymerization inhibitor, an antioxidant, an ultraviolet absorber, a light stabilizer, a colorant, metal oxide fine particles, and the like can be added thereto within a range which does not deteriorate the optical performance and the like. 
     In addition, in a case of using the cholesteric liquid crystal layer as a transparent screen, the substrate and the laminate in which the alignment film is laminated may be used as the transparent screen, or the substrate or the substrate and cholesteric liquid crystal layer in which the alignment film is peeled off may be used as the transparent screen. In addition, in a case where the wearable display device has a configuration including a transparent support (light guide plate), the transparent support may be used as the substrate of the cholesteric liquid crystal layer. 
     [Transparent Screen Having Diffuse Reflectivity] 
     A transparent screen having diffuse reflectivity reflects images projected obliquely in various directions. As a result, the light of projected image guided in the light guide plate is reflected in the front direction of the light guide plate (display) to display the projected image. 
     As the transparent screen having diffuse reflectivity, known diffuse reflective type transparent screens such as Kaleido Screen (high brightness front type) manufactured by JXTG Energy Corporation and Saivis manufactured by MITSUBISHI PAPER MILLS LIMITED can be used. 
     Alternatively, as the transparent screen having diffuse reflectivity, a cholesteric liquid crystal layer in which, as a cholesteric liquid crystal layer  28  shown in  FIG. 24 , the shape of the bright-dark line consisting of a bright portion  25  and a dark portion  26  derived from the cholesteric liquid crystalline phase, which is observed in the X-Z plane with SEM, is wavy (flapping structure) can also be used. 
     The cholesteric liquid crystal layer  28  shown in  FIG. 24  has the same configuration as the cholesteric liquid crystal layer  20  shown in  FIG. 9 , except that the shape of the bright-dark line consisting of the bright portion  25  and the dark portion  26  is wavy. 
     That is, the cholesteric liquid crystal layer  28  has a cholesteric liquid crystal structure, and is a layer having a structure in which the angle between the helical axis and the surface of the reflective layer changes periodically. In other words, the cholesteric liquid crystal layer has a cholesteric liquid crystal structure which gives a streak pattern of bright portions and dark portions in the cross-sectional view observed by SEM, and is a layer in which the angle between the normal line formed by the dark portion and the surface of the reflective layer changes periodically. 
     The flapping structure is preferably a structure that, in a continuous line of bright portions or dark portions which forms a streak pattern, at least one area M in which the absolute value of the inclination angle with respect to the plane of the cholesteric liquid crystal layer is 5° or more exists, and a crest or trough having an inclination angle of 0°, which is at the closest position sandwiching the area M in the plane direction, is specified. 
     The crest or trough having an inclination angle of 0° includes a convex shape and a concave shape, but also includes points having a stair shape or a shelf shape in a case where the inclination angle thereof is 0°. In the flapping structure, it is preferable that, in the continuous line of bright portions or dark portions which forms a streak pattern, the area M in which the absolute value of the inclination angle is 5° or more and the crest or trough sandwiching the area M are repeated multiply. 
     The cholesteric liquid crystal layer having a flapping structure can be formed by forming a cholesteric liquid crystal layer on a forming surface which is not subjected to an alignment treatment such as rubbing. 
     &lt;Projection Device Projecting Image&gt; 
     The wearable display device according to the embodiment of the present invention includes a projection device for projecting an image on the transparent screen. The projection device can be obtained by using a known technique. The projection device is preferably small for inclusion in the wearable display device. In addition, the projection device may be any device which emits visible light. In addition, in a case where the transparent screen selectively reflects circular polarization (either right or left), the projection device preferably emits circular polarization suitable for the reflection. 
     In addition, by including two projection devices projecting different images for the right eye and the left eye, it is also possible to display a stereoscopic image. 
     &lt;Lens&gt; 
     In the wearable display device according to the embodiment of the present invention, a lens for viewing the above-described image reflected from the above-described transparent screen is disposed on a viewing side to cover at least a part of the above-described transparent screen, preferably disposed on the viewing side to cover only a part of the transparent screen. The lens is a magnifying lens, and may be an eyepiece lens. It is preferable that these lenses have separate lenses for the right eye and the left eye. 
     By adjusting the focal length of the above-described lens, the viewer can view the projected image reflected by the transparent screen. The lens can be obtained by using a known technique. 
     &lt;Light Guide Plate (Transparent Support)&gt; 
     The wearable display device according to the embodiment of the present invention preferably includes a light guide plate which guides the image projected by the above-described projection device to the above-described transparent screen, and it is preferable that at least a part of the transparent screen is the light guide plate. 
     As the light guide plate, a known plate can be used, and examples thereof include an acrylic plate formed of a transparent acrylic resin and a glass plate. 
     In addition, the thickness of the light guide plate is not particularly limited, but is preferably 10 mm or less in consideration of practicality. 
     EXAMPLES 
     Example 1 
     &lt;Support with Alignment Layer&gt; 
     An alignment layer coating solution Y1 having the following composition was applied to a triacetylcellulose support (manufactured by FUJIFILM Corporation, TG40) using a #3.6 wire bar coater. Thereafter, the alignment layer coating solution Y1 was dried at 45° C. for 60 seconds, and irradiated with ultraviolet rays of an irradiation amount of 500 mJ/cm 2  using an ultraviolet irradiation device at 25° C. to produce a support with an alignment layer Y1. 
     (Composition of Alignment Layer Coating Solution Y1) 
     
       
         
           
               
               
               
             
               
                   
               
             
            
               
                 KAYARAD PET30  
                 100 
                 parts by mass 
               
               
                 (manufactured by Nippon Kayaku Co., Ltd.) 
                   
                   
               
               
                 IRGACURE 907 (manufactured by BASF) 
                 3.0 
                 parts by mass 
               
               
                 KAYACURE DETX  
                 1.0  
                 part by mass 
               
               
                 (manufactured by Nippon Kayaku Co., Ltd.) 
                   
                   
               
               
                 Fluorine-based horizontal alignment agent F1 
                 0.01 
                 parts by mass 
               
               
                 Methyl isobutyl ketone 
                 243 
                 parts by mass 
               
               
                   
               
            
           
         
       
     
     Fluorine-Based Horizontal Alignment Agent F1 
     
       
         
         
             
             
         
       
     
     &lt;Composition of Cholesteric Liquid Crystal Layers B1, G1, and R1&gt; 
     (Coating solutions B1, G1, and R1 for cholesteric liquid crystal layer) A coating solution for forming a cholesteric liquid crystal layer, which has the following composition, was prepared by mixing the following components. 
     
       
         
           
               
               
               
             
               
                   
                   
               
             
            
               
                   
                 Mixture 1 of liquid crystal compounds 
                  100 parts by mass 
               
               
                   
                 Fluorine-based horizontal alignment  
                 0.08 parts by mass 
               
               
                   
                 agent F1 
                   
               
               
                   
                 Fluorine-based horizontal alignment  
                 0.20 parts by mass 
               
               
                   
                 agent F2 
                   
               
               
                   
                 Clockwise chiral agent LC-756  
                 amount shown in Table 1 
               
               
                   
                 (manufactured by BASF) 
                   
               
               
                   
                 Fluorine-based surfactant B1 
                 0.08 parts by mass 
               
               
                   
                 IRGACURE OXE01  
                  1.5 parts by mass 
               
               
                   
                 (manufactured by BASF) 
                   
               
               
                   
                 Methyl ethyl ketone 
                 amount shown in Table 1 
               
               
                   
                   
               
            
           
         
       
     
     
       
         
           
               
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                 Coating solution 
                 LC-756 
                 Methyl ethyl ketone 
               
               
                   
               
             
            
               
                 Coating solution B1 
                 6.95 parts by mass 
                 888.8 parts by mass 
               
               
                 Coating solution G1 
                 5.53 parts by mass 
                 440.2 parts by mass 
               
               
                 Coating solution R1 
                 4.63 parts by mass 
                 381.7 parts by mass 
               
               
                   
               
            
           
         
       
     
     Mixture 1 of Liquid Crystal Compounds 
     A numerical value is mass %. 
     
       
         
         
             
             
         
       
     
     Fluorine-based horizontal alignment agent F2 
     
       
         
         
             
             
         
       
     
     Fluorine-based surfactant B1 
     A numerical value is mass %. 
     
       
         
         
             
             
         
       
     
     Cholesteric liquid crystal coating solutions B1, G1, and R1 were prepared by adjusting the prescribed amount of the chiral agent LC-756 and amount of methyl ethyl ketone in the coating solution having the above composition. Using each coating solution, in a case where each single-layer cholesteric liquid crystal layer was produced on a peelable support in the same manner as in the production of the functional layer below, and reflection characteristics were confirmed, all of the produced cholesteric liquid crystal layers were right-handed circular polarization reflecting layer, and center reflection wavelengths of selective reflection were 435 nm, 545 nm, and 650 nm, respectively in the order of coating solutions B1, G1, R1. 
     Here, the center reflection wavelength is a value calculated, using a spectrophotometer (manufactured by JASCO Corporation, V-550) equipped with a large integrating sphere device (manufactured by JASCO Corporation, ILV-471), based on the integrated reflectivity measured without using an optical trap so that light is incident from the cholesteric liquid crystal layer side. Specifically, the center reflection wavelength is a value obtained by obtaining the average reflectivity (arithmetic mean) of the maximum and minimum integrated reflectivity in the integral reflection spectrum which is mountain-shaped (convex upward) wavelength as the horizontal axis, defining, of two wavelengths at two intersections of the waveform and the average reflectivity, wavelength value on the short wave side as λA (nm) and wavelength value on the long wave side as λB (nm), and calculating the center reflection wavelength by the following expression. 
       Center reflection wavelength=(λ A+λB )/2
 
     &lt;Production of Display Member 01&gt; 
     The coating solution B1 prepared above was applied to a surface of the alignment layer Y1 in the support with an alignment layer Y1 using a #2.6 wire bar coater, dried at 95° C. for 60 seconds, and irradiated with ultraviolet rays of an irradiation amount of 500 mJ/cm 2  at 25° C. to produce a cholesteric liquid crystal B1 layer which reflects light having a center wavelength of 435 nm. Next, the coating solution G1 was applied to a surface of the B1 layer using a #2.0 wire bar coater, dried at 95° C. for 60 seconds, and irradiated with ultraviolet rays of an irradiation amount of 500 mJ/cm 2  at 25° C. to laminate a cholesteric liquid crystal layer G1 thereon. Next, the coating solution R1 was applied to a surface of the G1 layer using a #2.0 wire bar coater, dried at 95° C. for 60 seconds, and irradiated with ultraviolet rays of an irradiation amount of 500 mJ/cm 2  at 25° C. to laminate a cholesteric liquid crystal layer R1 thereon. Furthermore, in the support of the produced laminate, a transparent acrylic plate was adhered to a surface opposite to the side having the cholesteric liquid crystal layer using a pressure sensitive adhesive, thereby producing a display member 01. 
     Example 2 
     &lt;Inclined Liquid Crystal Layer&gt; 
     (Chiral agent compound CD-1) 
     A compound CD-1 was synthesized by a general method according to the following synthesis procedure. 
     The compound CD-1 is a chiral agent in which the helical direction is left and the helical twisting power does not change due to change in temperature or irradiation with light. 
     
       
         
         
             
             
         
       
     
     (Synthesis of Chiral Agent Compound CD-2) 
     The following compound CD-2 was synthesized according to JP2002-338575A and used. 
     The compound CD-2 is a chiral agent in which the helical direction is right and the helical twisting power changes due to irradiation with light (corresponding to the chiral agent X). 
     
       
         
         
             
             
         
       
     
     (Disk-Like Liquid Crystal Compound D-1) 
     As a disk-like liquid crystal compound, the following disk-like liquid crystal compound D-1 described in JP2007-131765A was used. 
     
       
         
         
             
             
         
       
     
     (Surfactant S-1) 
     A surfactant S-1 is a compound described in JP5774518B, and has the following structure. 
     
       
         
         
             
             
         
       
     
     &lt;Step 1: Production of Inclined Liquid Crystal Layer 1&gt; 
     (Composition for Inclined Liquid Crystal Layer) 
     A sample solution having the following composition was prepared. 
     
       
         
           
               
               
             
               
                   
               
             
            
               
                 Compound D-1 
                  100 parts by mass 
               
               
                 Compound S-1 
                  0.1 parts by mass 
               
               
                 Initiator Irg-907 (manufactured by BASF) 
                  3.0 parts by mass 
               
            
           
           
               
            
               
                 Solvent (methyl ethyl ketone (MEK)/cyclohexanone = 90/10 (mass ratio)) 
               
               
                 amount at which the concentration of solute is 30 mass % 
               
               
                   
               
            
           
         
       
     
     (Method for Producing Inclined Liquid Crystal Layer 1) 
     Next, a rectangular glass substrate coated with polyimide SE-130 (manufactured by Nissan Chemical Corporation) was subjected to a rubbing treatment in the longitudinal direction to produce a substrate with an alignment film. The rubbing-treated surface of the alignment film was spin-coated with 30 μL of the above-described composition for an inclined liquid crystal layer at a rotation speed of 1000 rpm for 10 seconds, and aged at 120° C. for 1 minute. Subsequently, the above-described coating film was cured by being irradiated with ultraviolet rays (UV) of an irradiation amount of 500 mJ/cm 2  at 30° C. under a nitrogen atmosphere, thereby obtaining an inclined liquid crystal layer 1. 
     It was confirmed that the alignment of liquid crystal in the inclined liquid crystal layer 1 was inclined by an average of 16° with respect to the longitudinal direction of the substrate. 
     &lt;Step 2: Production of Cholesteric Liquid Crystal Layer&gt; 
     (Composition of Cholesteric Liquid Crystal Layer G1) 
     A sample solution having the following composition was prepared. 
     
       
         
           
               
             
               
                   
               
               
                 Liquid crystalline compound LC-1 represented by following structure 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                   
                 100 
                 parts by mass 
               
               
                 Compound S-1 
                 0.1 
                 parts by mass 
               
               
                 Compound CD-1 
                 5.5 
                 parts by mass 
               
               
                 Compound CD-2 
                 5.5 
                 parts by mass 
               
               
                 Fluorine-based surfactant B1 
                 0.03 
                 parts by mass 
               
               
                 Initiator Irg-907 (manufactured by BASF) 
                 2.0 
                 parts by mass 
               
            
           
           
               
               
            
               
                 Solvent (methyl ethyl ketone (MEK)/cyclohexanone = 
                 90/10 (mass ratio)) 
               
            
           
           
               
               
               
            
               
                 amount at which the concentration of solute is 30 mass % 
                   
                   
               
               
                   
               
               
                 
                   
                     
                     
                         
                         
                     
                   
                 
               
            
           
         
       
     
     (Production of Cholesteric Liquid Crystal Layer G1) 
     Next, the inclined liquid crystal layer 1 was spin-coated with 40 μL of the above-described composition of a cholesteric liquid crystal layer G1 at a rotation speed of 1500 rpm for 10 seconds to form a composition layer, and aged at 90° C. for 1 minute. Subsequently, the composition layer after aging was ultraviolet-irradiated at 30° C. with 365 nm light from a light source (manufactured by UVP, LLC, 2UV TRANSILLUMINATOR) at an irradiation intensity of 2 mW/cm 2  for 60 seconds. Subsequently, the above-described composition layer was irradiated with ultraviolet rays (UV) of an irradiation amount of 500 mJ/cm 2  at 30° C. under a nitrogen atmosphere to perform a polymerization reaction of the liquid crystal compound, thereby obtaining a cholesteric liquid crystal layer G1 in which the cholesteric alignment state is immobilized. The reflection center wavelength was 550 nm. 
     By the above-described steps, a laminate G having the inclined liquid crystal layer 1 and the cholesteric liquid crystal layer G1 disposed on the inclined liquid crystal layer 1 was produced. 
     The cholesteric liquid crystal layer 1 in the obtained temporary laminate 1 was evaluated as follows. 
     (SEM Observation of Cross Section) 
     By SEM observation of the cross section (SEM image of the cross section) of the cholesteric liquid crystal layer G1 in the laminate G, it was confirmed that the array direction of the bright portion and dark portion derived from the cholesteric liquid crystalline phase were inclined in one direction with respect to both main planes (surface on the interface side with the inclined liquid crystal layer 1 and surface on the air interface side) of the cholesteric liquid crystal layer G1, and the angle thereof was approximately 15 degrees. 
     &lt;Confirmation of Reflection Anisotropy&gt; 
     Using a gonio-spectrophotometric color measurement system (manufactured by MURAKAMI COLOR RESEARCH LABORATORY CO., LTD., GCMS-3B), the light receiving angle was fixed in the normal direction to the film, and polar angle dependence of the measured light incidence angle was measured. In this case, the polar angle was changed in the plane including the longitudinal direction in which the substrate with an alignment film was rubbed, and the wavelength of the incidence light was set to 550 nm. As a result, since the light receiving angle in the normal direction to the temporary laminate 1 is the strongest in a case where the measured light incidence angle was approximately 45 to 50 degrees, it was confirmed that, in a case where the normal direction to the laminate G was regarded as the direction of the specularly reflected ray, the bisector of the angle between the incoming ray from at least one direction onto the laminate G and a specularly reflected ray of the incoming ray was inclined by 5° or more with respect to the normal direction to the specular reflection surface of the above-described laminate G, and the laminate G had reflection anisotropy. 
     &lt;Production of Display Member 02&gt; 
     Next, cholesteric liquid crystal layers B1 and R1 were respectively produced on the inclined liquid crystal layer 1 in the same manner as the preparation of the cholesteric liquid crystal layer G1, except that the amounts of compound CD-1 and compound CD-2 added were adjusted such that the reflection center wavelength was 435 nm or 650 nm, thereby obtaining a laminate B and a laminate R. These laminates were adhered to each other using a pressure sensitive adhesive (SK pressure sensitive adhesive, manufactured by Soken Chemical &amp; Engineering Co., Ltd.) in the order in which the cholesteric liquid crystal layers B1, G1, and R1 were laminated. Furthermore, in the support of the produced laminate, a transparent acrylic plate was adhered to a surface opposite to the side having the cholesteric liquid crystal layer using a pressure sensitive adhesive, thereby producing a display member 02. 
     Next, the display member 01 or the display member 02 was disposed in the display disposition portion of virtual reality (VR) glasses (paper VR glasses, manufactured by ELECOM Co., Ltd.) with a lens. In a case of disposing the display member 02, the cholesteric liquid crystal layer was on the viewing side, and the longitudinal direction of the substrate with an alignment film, which was rubbed, was horizontal to the ground. 
     In a case where a projector (SHOWWX+, manufactured by MicroVision) was projected from an oblique direction on these display members so that the reflected light of the cholesteric liquid crystal layer was in the normal direction, it was confirmed that the projected image can be seen in a wide field of view. In addition, it was confirmed that, in the part without the lens, the background can be viewed without blurring. 
     The display member 02 looked brighter than the display member 01, and the visibility was good. 
     From these, it was confirmed that the wearable display device according to the embodiment of the present invention can be manufactured.