Patent Publication Number: US-2017351134-A1

Title: Projection member and method for manufacturing projection member

Description:
TECHNICAL FIELD 
     The present invention relates to a projection member and a method for manufacturing a projection member. 
     BACKGROUND ART 
     In the related art, known is a reflective liquid crystal display device that performs displaying by reflecting extraneous light such as sunlight or indoor illumination light, and one example thereof is disclosed in PTL 1. In PTL 1, disclosed is a stacked color cholesteric liquid crystal display element in which a first blue liquid crystal layer, a second green liquid crystal layer, and a third red liquid crystal layer are stacked in order from an element observation side. The stacked color cholesteric liquid crystal display element includes a green cut filter layer that is arranged between the green liquid crystal layer and the red liquid crystal layer and selectively absorbs light of a wavelength of less than or equal to 600 nm, thereby being capable of removing noise light of unnecessary color. 
     CITATION LIST 
     Patent Literature 
     PTL 1: International Publication No. 2007/004286 
     Technical Problem 
     A color cholesteric liquid crystal display element such as that disclosed in above PTL 1 may be used in a combiner for reflecting and projecting light from a picture source in a head-up display. The picture projected by the combiner may be required to be displayed in an enlarged manner in the head-up display. However, if enlarged display function is added to the combiner in the configuration in which the above color cholesteric liquid crystal display element is used in the combiner, degradation of display quality may be caused. 
     SUMMARY OF INVENTION 
     The present invention is conceived on the basis of above matters, and an object thereof is to reduce degradation of display quality. 
     Solution to Problem 
     A projection member of the present invention includes an optical functional layer that imparts an optical effect to light; and an optical functional layer carrier of a plate shape that has a plate surface with the optical functional layer disposed thereon, is subjected to biaxial stretching or uniaxial stretching in such a manner that one of two intersecting directions along the plate surface is a low stretching direction in which a stretch ratio is relatively low or a non-stretching direction in which stretching is not performed and that the other is a high stretching direction in which the stretch ratio is relatively high or a stretching direction in which stretching is performed, and is subjected to biaxial deformation or uniaxial deformation to have the plate surface deformed into a curved shape in such a manner that a large elongation amount direction in which the amount of elongation by deformation is relatively large or a deformation direction in which deformation is generated matches the low stretching direction or the non-stretching direction and that a small elongation amount direction in which the amount of elongation by deformation is relatively small or a non-deformation direction in which deformation is not generated matches the high stretching direction or the stretching direction. 
     Accordingly, since the optical functional layer carrier of a plate shape in which the optical functional layer imparting an optical effect to light is disposed on the plate surface is subjected to biaxial stretching or uniaxial stretching, the optical functional layer carrier can acquire sufficient strength or the like. In addition, since the optical functional layer carrier is subjected to biaxial deformation or uniaxial deformation to have the plate surface of a curved shape, a projected picture by light to which an optical effect is imparted by the optical functional layer disposed on the plate surface can be visually recognized by a user in an enlarged form. 
     In the case of biaxial deformation of the optical functional layer carrier, the large elongation amount direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the small elongation amount direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation in the large elongation amount direction by deformation is smoothly performed, and elongation in the small elongation amount direction by deformation is sufficiently performed. Accordingly, stress that may be exerted by deformation on the optical functional layer carrier is suitably relieved, and creases and the like are unlikely to be generated in the optical functional layer. In the case of uniaxial deformation of the optical functional layer carrier, the deformation direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the non-deformation direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation in the deformation direction by deformation is smoothly performed. Accordingly, stress that may be exerted by deformation on the optical functional layer carrier is suitably relieved, and creases and the like are unlikely to be generated in the optical functional layer. Accordingly, display quality related to the projected picture by light to which an optical effect is imparted by the optical functional layer is unlikely to be degraded. 
     The following configurations are preferable as embodiments of the projection member of the present invention. 
     (1) The optical functional layer is a light reflection layer that reflects light. Accordingly, the light reflection layer reflecting light enables a projected picture by reflective light to be visually recognized by the user. Since creases and the like are unlikely to be generated in the light reflection layer, display quality related to the projected picture based on reflective light is unlikely to be degraded. 
     (2) The light reflection layer is configured of a cholesteric liquid crystal layer that selectively reflects any one of left handed circularly-polarized light and right handed circularly-polarized light in a specific wavelength range. Accordingly, the cholesteric liquid crystal layer selectively reflecting any one of left handed circularly-polarized light and right handed circularly-polarized light in a specific wavelength range enables the projected picture by reflective light to be visually recognized by the user. Since creases and the like are unlikely to be generated in the cholesteric liquid crystal layer, display quality related to the projected picture based on reflective light is unlikely to be degraded. 
     (3) The cholesteric liquid crystal layer has a stack structure of a first cholesteric liquid crystal layer and a second cholesteric liquid crystal layer selectively reflecting the same circularly-polarized light as the first cholesteric liquid crystal layer and includes a ½ wavelength retardation plate that is arranged in a form of being interposed between the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer and converts any one of left handed circularly-polarized light and right handed circularly-polarized light into another circularly-polarized light, and the ½ wavelength retardation plate is subjected to biaxial stretching or uniaxial stretching in such a manner that one of two intersecting directions along a plate surface thereof is the low stretching direction or the non-stretching direction and that the other is the high stretching direction or the stretching direction, and furthermore, is subjected to biaxial deformation or uniaxial deformation in such a manner that the large elongation amount direction or the deformation direction matches the low stretching direction or the non-stretching direction and that the small elongation amount direction or the non-deformation direction matches the high stretching direction or the stretching direction. Accordingly, since the ½ wavelength retardation plate arranged in the form of being interposed between the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer can convert any one of left handed circularly-polarized light and right handed circularly-polarized light into another circularly-polarized light, the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer that selectively reflect the same circularly-polarized light can efficiently reflect light to be used in projection, and the efficiency of use of light is excellent. In addition, in the case of biaxial deformation of the ½ wavelength retardation plate, the large elongation amount direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the small elongation amount direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation generated by deformation is unlikely to cause phase modulation. In the case of uniaxial deformation of the ½ wavelength retardation plate, the deformation direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the non-deformation direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation generated by deformation is unlikely to cause phase modulation. Accordingly, since the ½ wavelength retardation plate can properly exhibit optical performance, display quality related to a projected picture by light to which an optical effect is imparted by the ½ wavelength retardation plate is unlikely to be degraded. 
     (4) The projection member includes a second optical functional layer that imparts an optical effect to light; and a second optical functional layer carrier that has a plate surface with the second optical functional layer disposed thereon, is directly or indirectly bonded to the optical functional layer carrier, is subjected to biaxial stretching or uniaxial stretching in such a manner that one of two intersecting directions along the plate surface is the low stretching direction or the non-stretching direction and that the other is the high stretching direction or the stretching direction, and furthermore, is subjected to biaxial deformation or uniaxial deformation in such a manner that the large elongation amount direction or the deformation direction matches the low stretching direction or the non-stretching direction and that the small elongation amount direction or the non-deformation direction matches the high stretching direction or the stretching direction. Accordingly, since the second optical functional layer carrier of a plate shape in which the second optical functional layer imparting an optical effect to light is disposed on the plate surface is subjected to biaxial stretching or uniaxial stretching, the second optical functional layer carrier can acquire sufficient strength or the like. In addition, the second optical functional layer carrier is directly or indirectly bonded to the optical functional layer carrier and is subjected to biaxial deformation or uniaxial deformation as follows. That is, in the case of biaxial deformation of the second optical functional layer carrier, the large elongation amount direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the small elongation amount direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation in the large elongation amount direction by deformation is smoothly performed, and elongation in the small elongation amount direction by deformation is sufficiently performed. Accordingly, stress that may be exerted by deformation on the second optical functional layer carrier is suitably relieved, and creases and the like are unlikely to be generated in the second optical functional layer. In the case of uniaxial deformation of the second optical functional layer carrier, the deformation direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the non-deformation direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation in the deformation direction by deformation is smoothly performed. Accordingly, stress that may be exerted by deformation on the second optical functional layer carrier is suitably relieved, and creases and the like are unlikely to be generated in the second optical functional layer. Accordingly, the optical performance of the second optical functional layer can be favorably secured. 
     (5) The second optical functional layer is configured of any of an antireflection layer that prevents reflection of light, an ultraviolet ray absorption layer that selectively absorbs ultraviolet rays, and an infrared ray absorption layer that selectively absorbs infrared rays. Accordingly, the optical performance of the second optical functional layer configured of any of the antireflection layer, the ultraviolet ray absorption layer, and the infrared ray absorption layer can be favorably secured. 
     (6) The projection member includes a substrate of a plate shape that has a larger plate thickness than the optical functional layer carrier, is directly or indirectly bonded to the optical functional layer carrier or the optical functional layer, and is subjected to biaxial deformation or uniaxial deformation in such a manner that one of two intersecting directions along a plate surface thereof is the large elongation amount direction or the deformation direction and that the other is the small elongation amount direction or the non-deformation direction. Accordingly, the substrate that has a plate shape of a larger plate thickness than the optical functional layer carrier independently functions to maintain the shape of the projection member in a state after biaxial deformation or uniaxial deformation. 
     (7) A recess portion of which a plan view shape is a circular shape, an elliptic shape, or a grid shape in a case of the biaxial deformation of the substrate and of which the plan view shape is a straight linear shape extending in a form of following the deformation direction or a grid shape in a case of the uniaxial deformation of the substrate is disposed in the substrate. The substrate, since having a plate shape of a larger plate thickness than the optical functional layer carrier, is unlikely to be subjected to biaxial deformation or uniaxial deformation and is subjected to relatively great stress by deformation compared with the optical functional layer carrier. Thus, the stress may adversely affect the optical functional layer carrier and the optical functional layer. Regarding this point, the recess portion is disposed in the substrate, and the plan view shape of the recess portion is a circular shape, an elliptic shape, or a grid shape in the case of biaxial deformation of the substrate. Thus, biaxial deformation of the substrate can be facilitated. In the case of uniaxial deformation of the substrate, the recess portion is disposed in such a manner that the plan view shape of the recess portion is a straight linear shape extending in the form of following the deformation direction or a grid shape. Thus, uniaxial deformation of the substrate can be facilitated. Accordingly, stress that may be exerted by deformation on the substrate is relieved, and the stress is unlikely to affect the optical functional layer carrier and the optical functional layer. Thus, creases and the like are unlikely to be generated in the optical functional layer. 
     (8) A recess portion of which a plan view shape is a circular shape, an elliptic shape, or a grid shape in a case of the biaxial deformation of the optical functional layer carrier and of which the plan view shape is a straight linear shape extending in a form of following the deformation direction or a grid shape in a case of the uniaxial deformation of the optical functional layer carrier is disposed in the optical functional layer carrier. Accordingly, since the plan view shape of the recess portion is a circular shape, an elliptic shape, or a grid shape in the case of biaxial deformation of the optical functional layer carrier, biaxial deformation of the optical functional layer carrier can be facilitated. In the case of uniaxial deformation of the optical functional layer carrier, the recess portion is disposed in such a manner that the plan view shape of the recess portion is a straight linear shape extending in the form of following the deformation direction or a grid shape. Thus, uniaxial deformation of the optical functional layer carrier can be facilitated. Accordingly, stress that may be exerted by deformation on the optical functional layer carrier is relieved, and creases and the like are unlikely to be generated in the optical functional layer disposed on the plate surface of the optical functional layer carrier. 
     (9) The recess portion is filled with a transparent resin material that has the same refractive index as the substrate or the optical functional layer carrier. Accordingly, filling the recess portion with the transparent resin material having the same refractive index as the substrate or the optical functional layer carrier makes diffuse reflection unlikely to be generated in the interface of the recess portion. Accordingly, display quality is more unlikely to be degraded. 
     (10) The substrate or the optical functional layer carrier, in which the recess portion is disposed, is arranged on the opposite side of the optical functional layer from a side where the light is supplied. Accordingly, an optical effect is imparted to light before the recess portion by the optical functional layer. Accordingly, the optical performance of the optical functional layer being degraded by the recess portion is avoided. 
     A method for manufacturing a projection member of the present invention includes a stretching step of performing biaxial stretching or uniaxial stretching of an optical functional layer carrier of a plate shape in such a manner that one of two intersecting directions along a plate surface of the optical functional layer carrier is a low stretching direction in which a stretch ratio is relatively low or a non-stretching direction in which stretching is not performed and that the other is a high stretching direction in which the stretch ratio is relatively high or a stretching direction in which stretching is performed; an optical functional layer forming step of forming an optical functional layer on the plate surface of the optical functional layer carrier in a flat state; and a deforming step of deforming the optical functional layer carrier along with the optical functional layer to make the plate surface have a curved shape by biaxial deformation or uniaxial deformation in such a manner that a large elongation amount direction in which the amount of elongation by deformation is relatively large or a deformation direction in which deformation is generated matches the low stretching direction or the non-stretching direction and that a small elongation amount direction in which the amount of elongation by deformation is relatively small or a non-deformation direction in which deformation is not generated matches the high stretching direction or the stretching direction. 
     Accordingly, since the optical functional layer carrier of a plate shape in which the optical functional layer imparting an optical effect to light is disposed on the plate surface is subjected to biaxial stretching or uniaxial stretching in the stretching step, the optical functional layer carrier can acquire sufficient strength or the like. In addition, since the optical functional layer carrier is subjected to biaxial deformation or uniaxial deformation to have the plate surface of a curved shape in the deforming step, a projected picture by light to which an optical effect is imparted by the optical functional layer disposed on the plate surface can be visually recognized by a user in an enlarged form. 
     In the deforming step, in the case of biaxial deformation of the optical functional layer carrier, the large elongation amount direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the small elongation amount direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation in the large elongation amount direction by deformation is smoothly performed, and elongation in the small elongation amount direction by deformation is sufficiently performed. Accordingly, stress that may be exerted by deformation on the optical functional layer carrier is suitably relieved, and creases and the like are unlikely to be generated in the optical functional layer. In the deforming step, in the case of uniaxial deformation of the optical functional layer carrier, the deformation direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the non-deformation direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation in the deformation direction by deformation is smoothly performed. Accordingly, stress that may be exerted by deformation on the optical functional layer carrier is suitably relieved, and creases and the like are unlikely to be generated in the optical functional layer. Accordingly, display quality related to the projected picture by light to which an optical effect is imparted by the optical functional layer is unlikely to be degraded. 
     The following configurations are preferable as embodiments of the method for manufacturing a projection member of the present invention. 
     (1) The method for manufacturing a projection member includes a substrate bonding step of directly or indirectly bonding the optical functional layer to a substrate of a plate shape having a larger plate thickness than the optical functional layer carrier, the substrate bonding step being performed between the optical functional layer forming step and the deforming step; and a carrier detaching step of detaching the optical functional layer carrier from the optical functional layer, the carrier detaching step being performed after at least the deforming step has been performed. Accordingly, since, in the substrate bonding step, the substrate having a plate shape of a larger plate thickness than the optical functional layer carrier, is directly or indirectly bonded to the optical functional layer, the optical functional layer is held by the substrate even if the carrier detaching step is performed after the deforming step to detach the optical functional layer carrier from the optical functional layer. Accordingly, the projection member can be thin and lightweight. In the deforming step, the optical functional layer carrier makes creases and the like unlikely to be generated in the optical functional layer. 
     (2) The method for manufacturing a projection member includes a substrate bonding step of directly or indirectly bonding the optical functional layer carrier or the optical functional layer to a substrate of a plate shape having a larger plate thickness than the optical functional layer carrier, the substrate bonding step being performed between the optical functional layer forming step and the deforming step; a recess portion forming step of forming a recess portion in at least any one of a plate surface of the optical functional layer carrier on the opposite side from the optical functional layer side and a plate surface of the substrate on the opposite side from the optical functional layer carrier or optical functional layer side, the recess portion forming step being performed prior to at least the deforming step, the plan view shape of the recess portion being a circular shape, an elliptic shape, or a grid shape in a case of the biaxial deformation in the deforming step, and the plan view shape of the recess portion being a straight linear shape extending in a form of following the deformation direction or a grid shape in a case of the uniaxial deformation in the deforming step; and a recess portion removing step of removing the recess portion, the recess portion removing step being performed after at least the deforming step has been performed. Accordingly, the recess portion that is formed in at least any one of the plate surface of the optical functional layer carrier on the opposite side from the optical functional layer side and the plate surface of the substrate on the opposite side from the optical functional layer carrier or optical functional layer side in the recess portion forming step can facilitate biaxial deformation of at least any one of the optical functional layer carrier and the substrate in the deforming step since the plan view shape of the recess portion is a circular shape, an elliptic shape, or a grid shape in the case of biaxial deformation of the optical functional layer carrier in the deforming step. In the case of uniaxial deformation of the optical functional layer carrier in the deforming step, the recess portion of which the plan view shape is a straight linear shape extending in the form in the deformation direction or a grid shape is disposed. Thus, the recess portion can facilitate uniaxial deformation of at least any one of the optical functional layer carrier and the substrate in the deforming step. Accordingly, stress that may be exerted by deformation on the optical functional layer carrier is relieved, and creases and the like are unlikely to be generated in the optical functional layer disposed on the plate surface of the optical functional layer carrier. In the recess portion removing step that is performed after at least the deforming step, the recess portion is removed. Thus, diffuse reflection of light being caused by the recess portion can be avoided, and degradation of display quality is further reduced. 
     (3) In the stretching step, the optical functional layer carrier is heated to a predetermined heat setting temperature, and in the deforming step, the optical functional layer carrier and the optical functional layer are subjected to thermal pressing in a temperature environment of higher than or equal to a glass transition temperature of the optical functional layer carrier and less than or equal to the heat setting temperature in the stretching step. If the temperature environment in thermal pressing performed in the deforming step is lower than the glass transition temperature of the optical functional layer carrier, the deformed shape of the optical functional layer carrier is unlikely to be maintained. Conversely, if the temperature environment is higher than the heat setting temperature in the stretching step, contraction may be generated in the optical functional layer carrier. Regarding this point, in the deforming step, as described above, the optical functional layer carrier and the optical functional layer are subjected to thermal pressing in a temperature environment of higher than or equal to the glass transition temperature of the optical functional layer carrier and less than or equal to the heat setting temperature in the stretching step. Thus, the deformed shape of the optical functional layer carrier can be maintained, and contraction being generated in the optical functional layer carrier can be avoided. 
     Advantageous Effects of Invention 
     According to the present invention, degradation of display quality can be reduced. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a side view illustrating a schematic configuration of a head-up display according to Embodiment 1 of the present invention in a state of being mounted in an automobile. 
         FIG. 2  is a side view illustrating a positional relationship between a combiner and a projection device constituting the head-up display. 
         FIG. 3  is a plan view of the combiner. 
         FIG. 4  is a long edge side view of the combiner. 
         FIG. 5  is a perspective view of a light reflection unit constituting the combiner. 
         FIG. 6  is a short edge side sectional view of the light reflection unit. 
         FIG. 7  is a long edge side sectional view of the light reflection unit. 
         FIG. 8  is a table illustrating numerical values such as an exterior shape and physical properties related to the combiner. 
         FIG. 9  is a plan view illustrating a step of performing biaxial stretching of a cholesteric liquid crystal layer carrier (stretching step). 
         FIG. 10  is a short edge side sectional view illustrating a step of forming a cholesteric liquid crystal layer on a plate surface of the cholesteric liquid crystal layer carrier (cholesteric liquid crystal layer forming step). 
         FIG. 11  is a short edge side sectional view illustrating a state before bonding of the cholesteric liquid crystal layer carrier and a substrate (substrate bonding step). 
         FIG. 12  is a short edge side sectional view illustrating a state after bonding of the cholesteric liquid crystal layer carrier and the substrate (substrate bonding step). 
         FIG. 13  is a short edge side sectional view illustrating a step of performing biaxial deformation of the light reflection unit (deforming step). 
         FIG. 14  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 2 of the present invention. 
         FIG. 15  is a long edge side sectional view of the light reflection unit. 
         FIG. 16  is a bottom view of the light reflection unit. 
         FIG. 17  is a sectional view illustrating a step of forming a recess portion in the plate surface of a substrate (recess portion forming step). 
         FIG. 18  is a sectional view illustrating a state of a cholesteric liquid crystal layer carrier being bonded to the substrate in which the recess portion is formed (substrate bonding step). 
         FIG. 19  is a sectional view illustrating a step of performing biaxial deformation of the light reflection unit (deforming step). 
         FIG. 20  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 3 of the present invention. 
         FIG. 21  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 4 of the present invention and is a sectional view illustrating a state before removal of a recess portion. 
         FIG. 22  is a sectional view illustrating a state of the recess portion being removed. 
         FIG. 23  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 5 of the present invention. 
         FIG. 24  is a sectional view illustrating a state before biaxial deformation of a light reflection unit. 
         FIG. 25  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 6 of the present invention. 
         FIG. 26  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 7 of the present invention. 
         FIG. 27  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 8 of the present invention. 
         FIG. 28  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 9 of the present invention. 
         FIG. 29  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 10 of the present invention. 
         FIG. 30  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 11 of the present invention. 
         FIG. 31  is a short edge side sectional view illustrating a state before biaxial deformation of a light reflection unit constituting a combiner according to Embodiment 12 of the present invention. 
         FIG. 32  is a short edge side sectional view illustrating a step of performing biaxial deformation of the light reflection unit. 
         FIG. 33  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 13 of the present invention. 
         FIG. 34  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 14 of the present invention. 
         FIG. 35  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 15 of the present invention. 
         FIG. 36  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 16 of the present invention. 
         FIG. 37  is a short edge side sectional view illustrating a state before biaxial deformation of a light reflection unit constituting a combiner according to Embodiment 17 of the present invention. 
         FIG. 38  is a short edge side sectional view illustrating a step of performing biaxial deformation of the light reflection unit. 
         FIG. 39  is a short edge side sectional view illustrating a step of removing a cholesteric liquid crystal layer carrier and an antireflection coat carrier from the light reflection unit. 
         FIG. 40  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 18 of the present invention. 
         FIG. 41  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 19 of the present invention. 
         FIG. 42  is a short edge side sectional view of a light reflection unit constituting a combiner according to Embodiment 20 of the present invention. 
         FIG. 43  is a bottom view of a light reflection unit constituting a combiner according to Embodiment 21 of the present invention. 
         FIG. 44  is a short edge side sectional view of the light reflection unit. 
         FIG. 45  is a long edge side sectional view of the light reflection unit. 
         FIG. 46  is a bottom view of a light reflection unit constituting a combiner according to Embodiment 22 of the present invention. 
         FIG. 47  is a short edge side sectional view of the light reflection unit. 
         FIG. 48  is a long edge side sectional view of the light reflection unit. 
         FIG. 49  is a perspective view of a light reflection unit constituting a combiner according to Embodiment 23 of the present invention. 
         FIG. 50  is a bottom view of the light reflection unit. 
         FIG. 51  is a perspective view of a light reflection unit constituting a combiner according to Embodiment 24 of the present invention. 
         FIG. 52  is a bottom view of the light reflection unit. 
         FIG. 53  is a bottom view of a light reflection unit constituting a combiner according to Embodiment 25 of the present invention. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Embodiment 1 
     Embodiment 1 of the present invention will be described with  FIG. 1  to  FIG. 13 . The present embodiment will illustrate a head-up display (projection display device)  10  that is mounted in an automobile. The head-up display  10  displays various types of information such as a driving speed, various alerts, and map information over a windshield  1  as if a virtual image VI exists in the front field of view of a driver at the time of driving, thereby being capable of reducing movements of the line of sight of the driver during driving. 
     As illustrated in  FIG. 1 , the head-up display  10  is configured of a projection device  11  that is accommodated in a dashboard  2  and projects a picture, and a combiner (projection member)  12  that is arranged in the form of facing the windshield  1  and projects the picture projected from the projection device  11  to be observed as the virtual image VI by an observer such as the driver. The combiner  12  is arranged in the form (backwards inclined attitude) of being parallel to the windshield  1  that is arranged to be inclined backwards from the vertical direction, and the projection device  11  is arranged in the dashboard  2  in the form of forming an angle of elevation with respect to the combiner  12 . 
     As illustrated in  FIG. 2 , the projection device  11  is configured of a laser diode (illuminant)  13 , a MEMS mirror element (display element)  14  that displays a picture by using light from the laser diode  13 , and a screen  15  to which the picture displayed on the MEMS mirror element  14  is projected in an enlarged form. The “MEMS” referred hereto is “micro electro mechanical systems”.  FIG. 2  illustrates the head-up display  10  in an attitude where the height direction of the drawing matches the height direction (a direction that is orthogonal with respect to the horizontal direction) of the combiner  12 . 
     As illustrated in  FIG. 1 , the combiner  12  is arranged in a position slightly separated inwards from the windshield  1  and is supported in the position by being attached to, for example, a support component disposed on the dashboard  2  or a sun visor (none is illustrated). As illustrated in  FIG. 3 , the combiner  12  has a widthwise long rectangular shape (quadrangular shape) that resembles the area of view (eye-box) of the observer such as the driver. Regarding specific dimensions, the combiner  12  has a long edge dimension of, for example, approximately 200 mm and a short edge dimension of, for example, 100 mm (refer to  FIG. 8 ). The “widthwise long rectangular shape” referred hereto is a rectangular shape that has a long edge direction (width direction) matching the horizontal direction and a short edge direction (height direction) matching the direction orthogonal with respect to the horizontal direction. The reason why the area of view of the observer has a widthwise long rectangular shape is that two pupils (eyes) of the observer are linearly arranged in the horizontal direction. A detailed configuration of the combiner  12  will be described later. The long edge direction of the combiner  12  (light reflection unit  16 ) is set as an X axis direction, and the short edge direction thereof is set as a Y axis direction. Furthermore, the thickness direction (a direction that is orthogonal with respect to the long edge direction and the short edge direction) of the combiner  12  (light reflection unit  16 ) is set as a Z axis direction. Each axis direction is illustrated in each drawing (except for  FIG. 1  and  FIG. 8 ). 
     As illustrated in  FIG. 2 , the laser diode  13  includes a red laser diode element that emits red light of a wavelength included in a red wavelength range (approximately 600 nm to approximately 780 nm), a green laser diode element that emits green light of a wavelength included a green wavelength range (approximately 500 nm to approximately 570 nm), and a blue laser diode element that emits blue light of a wavelength included in a blue wavelength range (approximately 420 nm to approximately 500 nm). Each laser diode element of each color constituting the laser diode  13  incorporates a resonator that resonates light by multiple reflections, and the emitted light thereof is coherent light as a beam having a wavelength and a phase aligned and is also linearly polarized light. The laser diode  13  emits red light, green light, and blue light in a predetermined order at predetermined timings. The light emission intensities of each color of the laser diode  13  are adjusted in such a manner that a picture displayed by the red light, the green light, and the blue light has a specific white balance. The laser diode elements of each color which are light emission sources are not illustrated. 
     As illustrated in  FIG. 2 , the MEMS mirror element  14  is configured by producing a single mirror and a driving unit for driving the mirror on a substrate by MEMS technology. The mirror has a circular shape having a diameter of, for example, approximately a few tenths of a millimeter to a few millimeters and can reflect light from the laser diode  13  with a reflective surface as a specular surface. The driving unit axially supports the mirror with two orthogonal axis units and can freely tilt the mirror by electromagnetic force or electrostatic force. The MEMS mirror element  14 , by controlling tilting of the mirror with the driving unit, emits light toward the screen  15  in the form of two-dimensionally scanning the screen  15  and thus can project a two-dimensional picture to the screen  15 . It is preferable to arrange a polarized light conversion unit (not illustrated) for conversion of the linearly polarized light emitted from the laser diode  13  into any one of left handed circularly-polarized light and right handed circularly-polarized light in the form of being interposed between the MEMS mirror element  14  and the laser diode  13 . The polarized light conversion unit is configured of, for example, a retardation plate that generates a retardation of ¼ wavelengths (¼ wavelength retardation plate). 
     As illustrated in  FIG. 2 , the screen  15  projects the light emitted from the MEMS mirror element  14  and projects the projected picture to the combiner  12 . The screen  15  functions as a secondary illuminant and imparts optical effects to the light from the MEMS mirror element  14  in such a manner that the area of irradiation on the projection surface of the combiner  12  has a widthwise long rectangular shape. 
     Next, the combiner  12  will be described in detail. As illustrated in  FIG. 2  and  FIG. 4 , the combiner  12  has a configuration in which three light reflection units (unit projection units)  16  that respectively selectively reflect light of different wavelength ranges are stacked in the thickness direction. Specifically, the combiner  12  includes, in a stacked form, a red light reflection unit  16 R that mainly selectively reflects light of a wavelength range belonging to red (red light), a green light reflection unit  16 G that mainly selectively reflects light of a wavelength range belonging to green (green light), and a blue light reflection unit  16 B that mainly selectively reflects light of a wavelength range belonging to blue (blue light). The light reflection units  16 R,  16 G, and  16 B of each color are bonded by a bonding layer (not illustrated) that is configured of an adhesive or the like. Any of the light reflection units  16  of each color constituting the combiner  12  has a cholesteric liquid crystal layer  17 . The cholesteric liquid crystal layer  17  has a periodic structure in which liquid crystal molecules are aligned in layers and each of the layers is rotated at a specific angle to form a helical pattern formed by stacked molecules, and thus can selectively reflect light of a specific wavelength based on the pitch of the helix of the liquid crystal molecules. The cholesteric liquid crystal layer  17  is acquired by adding a chiral material to a nematic liquid crystal material to align the stacked molecules in a twisting shape (helical shape). Adjusting the amount or the like of the added chiral material can appropriately change the pitch of the helix, that is, the wavelength of selectively reflected light (the peak wavelength of a peak included in a reflection spectrum). At this point, in order to adjust the half width of the peak included in the reflection spectra of the light reflection units  16 R,  16 G, and  16 B of each color, for example, the numerical value of the pitch of the helix of the liquid crystal molecules included in the cholesteric liquid crystal layer  17  or the ratio of contained liquid crystal molecules having a different numerical value of the pitch of the helix may be adjusted. The cholesteric liquid crystal layer  17  has polarized light selectivity that selectively reflects circularly-polarized light matching the circling direction of the liquid crystal molecules in a helical shape, that is, only one of left handed circularly-polarized light and right handed circularly-polarized light. In addition, the cholesteric liquid crystal layer  17  has incidence angle selectivity that selectively reflects only light having an angle of incidence within a specific range. 
     Accordingly, the combiner  12  is a reflection member having wavelength selectivity, transmits extraneous light that does not match the respective reflection spectra of the light reflection units  16 R,  16 G, and  16 B, and projects light reflected by each of the light reflection units  16 R,  16 G, and  16 B to the pupils of the observer as illustrated in  FIG. 1 . Thus, the virtual image VI that is projected by the reflective light can be observed by the observer with high luminance, and an image of the front outside of the windshield  1  based on the extraneous light transmitted by the combiner  12  can be favorably observed with high transmittance. At least 70% or higher transmittance of extraneous light (external visible light) is secured for the combiner  12  to meet the safety regulations of Road Transport Vehicle Act in Japan. Each of the light reflection units  16 R,  16 G, and  16 B constituting the combiner  12  absorbs a predetermined proportion of light in transmission of light that does not match the reflection spectrum. The light absorbances of each of the light reflection units  16 R,  16 G, and  16 B vary according to the wavelength of light and tend to increase on a shorter wavelength side and conversely decrease on a longer wavelength side. Specifically, the light absorbances of each of the light reflection units  16 R,  16 G, and  16 B are respectively, for example, approximately 20% for red light, approximately 25% for green light, and approximately 30% for blue light. 
     The light emission intensity of extraneous light does not have wavelength dependency in a reflection liquid crystal display device that generally uses extraneous light to perform displaying. Thus, if a blue liquid crystal layer of the highest absorbance that reflects blue light is arranged on the most element observation side in a color cholesteric liquid crystal display element used in the reflection liquid crystal display device, blue light being absorbed by a green liquid crystal layer and a red liquid crystal layer is avoided, and the intensity of extraneous light used in display is increased. However, as in the present embodiment, in the head-up display  10  that uses the laser diode  13  having a specific light emission spectrum as an illuminant, using a color cholesteric liquid crystal display element, as a combiner, that has the same arrangement and configuration as the above reflection liquid crystal display device may conversely decrease the intensity of light used in display. Specifically, the light emission intensity of the laser diode  13  that supplies light to the MEMS mirror element  14  has wavelength dependency and tends to include green light in largest proportion to maintain the white balance of the displayed picture. Meanwhile, absorbing of light by each of the light reflection units  16 R,  16 G, and  16 B constituting the combiner  12  also has wavelength dependency, and light reflected by one of the light reflection units  16 R,  16 G, and  16 B that is arranged far from the MEMS mirror element  14  is absorbed by another that is arranged near the MEMS mirror element  14 , and the intensity thereof tends to decrease. From these matters, if the color cholesteric liquid crystal display element included in the above reflection liquid crystal display device is used as a combiner, particularly the intensity of green light is decreased, and brightness related to the displayed picture may be decreased. 
     Therefore, regarding the stacking order of the light reflection units  16 R,  16 G, and  16 B, the combiner  12  according to the present embodiment is configured in such a manner that the green light reflection unit  16 G is arranged nearest the MEMS mirror element  14  (laser diode  13 ) and the observer. According to such a configuration, green light that is included in largest proportion in the light emitted from the laser diode  13  to maintain the white balance of the displayed picture can be efficiently reflected by the green light reflection unit  16 G that is nearest the MEMS mirror element  14  and the observer. In other words, green light that has the highest intensity being absorbed by the light reflection units  16 R and  16 B is avoided by arranging the red light reflection unit  16 R and the blue light reflection unit  16 B farther from the MEMS mirror element  14  and the observer than the green light reflection unit  16 G. Accordingly, the intensity of light used in display can be increased with the white balance favorably maintained. In addition, since green light has high relative visibility compared with red light and blue light, increasing the intensity of light as above improves luminance. Regarding the stacking order of the light reflection units  16 R,  16 G, and  16 B, the blue light reflection unit  16 B in the combiner  12  is arranged farthest from the MEMS mirror element  14  and the observer. That is, the light reflection units  16 R,  16 G, and  16 B constituting the combiner  12  are arranged to be linearly stacked on each other in the nearest order of the green light reflection unit  16 G, the red light reflection unit  16 R, and the blue light reflection unit  16 B from the MEMS mirror element  14  and the observer. The red light reflection unit  16 R is arranged to be sandwiched between the green light reflection unit  16 G, which is nearest the MEMS mirror element  14  and the observer, and the blue light reflection unit  16 B which is farthest from the MEMS mirror element  14  and the observer. 
     Next, a further detailed configuration of the light reflection unit  16  constituting the combiner  12  will be described. The following configuration of the light reflection unit  16  is common to the light reflection units  16 R,  16 G, and  16 B of each color. As illustrated in  FIG. 6  and  FIG. 7 , the light reflection unit  16  is configured in such a manner that the above cholesteric liquid crystal layer (a light reflection layer or a wavelength-selective reflection layer)  17 , a cholesteric liquid crystal layer carrier (light reflection layer carrier)  18  that has a plate surface with the cholesteric liquid crystal layer  17  disposed thereon, a substrate  19  that is indirectly bonded to the cholesteric liquid crystal layer carrier  18 , and transparent adhesive layer  20  for maintaining the state of the substrate  19  being bonded to the cholesteric liquid crystal layer carrier  18  are stacked in the thickness direction. 
     The cholesteric liquid crystal layer carrier  18  is configured of a synthetic resin material such as polyethylene terephthalate (PET), has excellent light transmissivity, and is almost transparent. The glass transition temperature of the synthetic resin material (PET) constituting the cholesteric liquid crystal layer carrier  18  is, for example, approximately 75° C. (refer to  FIG. 8 ). As illustrated in  FIG. 3 , the plan view shape of the cholesteric liquid crystal layer carrier  18  is a widthwise long rectangular shape in the same manner as the combiner  12 , and the cholesteric liquid crystal layer carrier  18  has a plate shape having a predetermined plate thickness. The cholesteric liquid crystal layer carrier  18  acquires high mechanical strength or the like by being subjected to stretching, so-called biaxial stretching, in two orthogonal directions along the plate surface thereof, that is, the short edge direction (Y axis direction) and the long edge direction (X axis direction) (refer to  FIG. 9 ). The cholesteric liquid crystal layer carrier  18  has a stretch ratio (extensibility) varying according to two stretching directions, that is, stretch anisotropy, and has the stretch ratio in the short edge direction (Y axis direction) larger than the stretch ratio in the long edge direction (X axis direction). That is, the cholesteric liquid crystal layer carrier  18  has the short edge direction (Y axis direction) matching a high stretching direction and has the long edge direction (X axis direction) matching a low stretching direction. The “stretch ratio” referred hereto is the ratio of dimensions after stretching with the dimensions of the cholesteric liquid crystal layer carrier  18  before stretching as a reference (100%). Specifically, the cholesteric liquid crystal layer carrier  18  has a stretch ratio of, for example, approximately 150% in the short edge direction and has a stretch ratio of, for example, approximately 120% in the long edge direction (refer to  FIG. 8 ). Furthermore, when the cholesteric liquid crystal layer carrier  18  is subjected to biaxial stretching, the cholesteric liquid crystal layer carrier  18  is heated to a temperature (hereinafter, referred to as a heat setting temperature) higher than the glass transition temperature thereof, and the heat setting temperature is, for example, approximately 150° C. (refer to  FIG. 8 ). As illustrated in  FIG. 6 , the above cholesteric liquid crystal layer  17  is disposed in almost even thickness across almost the entire area of the plate surface, of both of the outer and inner plate surfaces of the cholesteric liquid crystal layer carrier  18 , that faces a side (a substrate  19  side; a lower right side illustrated in  FIG. 6 ) where light is supplied by the projection device  11 . The plate thickness of the cholesteric liquid crystal layer carrier  18  is, for example, approximately 100 μm, and the thickness of the cholesteric liquid crystal layer  17  is, for example, approximately 3 μm. 
     The substrate  19  is configured of a synthetic resin material such as an acrylic resin (polymethyl methacrylate (PMMA) or the like), has excellent light transmissivity, and is almost transparent. The glass transition temperature of the synthetic resin material (PMMA) constituting the substrate  19  is, for example, approximately 100° C. (refer to  FIG. 8 ). As illustrated in  FIG. 3 , the plan view shape of the substrate  19  is a widthwise long rectangular shape in the same manner as the combiner  12  (cholesteric liquid crystal layer carrier  18 ), and the substrate  19  has a plate shape of which the plate thickness is larger than the plate thickness of the cholesteric liquid crystal layer carrier  18 . Specifically, the plate thickness of the substrate  19  is, for example, approximately 4 mm. Accordingly, the substrate  19  independently has function of securing the mechanical strength of the combiner  12  and function of maintaining the shape of the combiner  12 . The transparent adhesive layer  20  is configured of a double-sided tape member that has excellent light transmissivity and is almost transparent, such as an optical clear adhesive (OCA) tape. The transparent adhesive layer  20  is disposed on the plate surface, of both of the outer and inner plate surfaces of the substrate  19 , facing the opposite side from a side where light is supplied by the projection device  11 , and is directly bonded to the cholesteric liquid crystal layer  17 , thereby enabling indirect bonding of the cholesteric liquid crystal layer carrier  18  to the substrate  19 . That is, the transparent adhesive layer  20  is arranged in the form of being interposed between the substrate  19  and the cholesteric liquid crystal layer  17 . The thickness of the transparent adhesive layer  20  is, for example, approximately 25 μm. 
     Accordingly, as illustrated in  FIG. 6 , the light reflection unit  16  is configured by stacking the substrate  19 , the transparent adhesive layer  20 , the cholesteric liquid crystal layer  17 , and the cholesteric liquid crystal layer carrier  18  in this order from the side where light is supplied by the projection device  11 . In addition, the thickness dimensions of each constituent member of the light reflection unit  16  are larger in the order of the cholesteric liquid crystal layer  17 , the transparent adhesive layer  20 , the cholesteric liquid crystal layer carrier  18 , and the substrate  19 . 
     The combiner  12  and each light reflection unit  16  constituting the combiner  12  have a plate surface of an approximately spherical shape (curved shape) as illustrated in  FIG. 2 ,  FIG. 4 , and  FIG. 5 . Therefore, the cholesteric liquid crystal layer  17 , the cholesteric liquid crystal layer carrier  18 , the substrate  19 , and the transparent adhesive layer  20  constituting the light reflection unit  16  also have an approximately spherical shape. The light reflection unit  16  (the cholesteric liquid crystal layer carrier  18  and the substrate  19 ) is subjected to deformation, so-called biaxial deformation, along each deformation axis of two orthogonal directions along the plate surface thereof, that is, the short edge direction and the long edge direction, as a first deformation axis and a second deformation axis by thermal pressing or the like performed in manufacturing processes. The light reflection unit  16  has a curvature and a radius of curvature in the short edge direction (Y axis direction) almost the same as a curvature and a radius of curvature in the long edge direction (X axis direction). Specifically, the radii of curvature of the combiner  12  and the light reflection unit  16  are, for example, approximately 400 mm in any of the short edge direction and the long edge direction (refer to  FIG. 8 ). That is, the combiner  12  and the light reflection unit  16  are said to have a plate surface of an approximately spherical shape that has omnidirectionally the same radius of curvature. Thus, the cholesteric liquid crystal layer carrier  18  constituting the light reflection unit  16  has the percentage of elongation and the amount of elongation by biaxial deformation varying in the long edge direction and in the short edge direction, and the percentage of elongation and the amount of elongation in the long edge direction are larger than the percentage of elongation and the amount of elongation in the short edge direction. Specifically, the percentage of elongation that is required at the time of biaxial deformation of the cholesteric liquid crystal layer carrier  18  is, for example, approximately 100.3% in the short edge direction and is, for example, approximately 101.2% in the long edge direction (refer to  FIG. 8 ). 
     That is, the cholesteric liquid crystal layer carrier  18  is said to be subjected to biaxial deformation in such a manner that a large elongation amount direction in which the amount of elongation by deformation is relatively large matches the long edge direction (X axis direction), that is, the low stretching direction at the time of biaxial stretching, and that a small elongation amount direction in which the amount of elongation by deformation is relatively small matches the short edge direction (Y axis direction), that is, the high stretching direction at the time of biaxial stretching. In a stage after biaxial stretching, the cholesteric liquid crystal layer carrier  18  is relatively likely to be elongated to larger than or equal to the stretch ratio in the low stretching direction since having a relatively low stretch ratio in the low stretching direction and is relatively unlikely to be elongated to larger than or equal to the stretch ratio in the high stretching direction since having a relatively high stretch ratio in the high stretching direction. In other words, the cholesteric liquid crystal layer carrier  18  has relatively large room for further elongation (elongation potential) in the low stretching direction and has relatively small room for further elongation in the high stretching direction. While, at the time of performing biaxial deformation, the cholesteric liquid crystal layer carrier  18  is elongated and deformed in each of the two directions, the small elongation amount direction in which the amount of elongation is relatively small matches the high stretching direction in which elongation is relatively unlikely to be generated, and the large elongation amount direction in which the amount of elongation is relatively large matches the low stretching direction in which elongation is relatively likely to be generated. Thus, elongation in the large elongation amount direction is smoothly performed, and elongation in the small elongation amount direction is sufficiently performed. Accordingly, stress that may be exerted by biaxial deformation on the cholesteric liquid crystal layer carrier is suitably relieved, and creases and the like are unlikely to be generated in the cholesteric liquid crystal layer  17  disposed on the plate surface of the cholesteric liquid crystal layer carrier  18 . Accordingly, display quality related to a projected picture displayed on the basis of light to which a reflection effect is imparted by the cholesteric liquid crystal layer  17  is unlikely to be degraded. 
     Next, a method for manufacturing particularly the combiner  12  in the head-up display  10  of the above configuration will be described. The method for manufacturing the combiner  12  includes a stretching step of performing biaxial stretching of the cholesteric liquid crystal layer carrier  18 , a cholesteric liquid crystal layer forming step (optical functional layer forming step) of forming the cholesteric liquid crystal layer  17  in the cholesteric liquid crystal layer carrier  18 , a substrate bonding step of bonding the cholesteric liquid crystal layer carrier  18  and the substrate  19 , a deforming step of performing biaxial deformation of the light reflection unit  16 , and a light reflection unit bonding step of bonding each light reflection unit  16 . Hereinafter, the method for manufacturing the combiner  12  will be described by using  FIG. 9  to  FIG. 13 . While these drawings representatively illustrate a short edge side sectional configuration of the light reflection unit  16 , the long edge side sectional configuration of the light reflection unit  16  is the same as those drawings and will not be illustrated. 
     In the stretching step, as illustrated in  FIG. 9 , the cholesteric liquid crystal layer carrier  18  before stretching that is configured of a synthetic resin material (PET) is stretched in each of the short edge direction (Y axis direction) and the long edge direction (X axis direction). At this point, the cholesteric liquid crystal layer carrier  18  is heated to the heat setting temperature (for example, approximately 150° C.) over the glass transition temperature thereof (for example, approximately 75° C.) and is subjected to biaxial stretching. Accordingly, stretching is smoothly performed (refer to  FIG. 8 ). The cholesteric liquid crystal layer carrier  18  is cooled after stretching, thereby having fixed dimensions in the stretched state. At this point, the stretch ratio of the cholesteric liquid crystal layer carrier  18  is approximately 150% in the short edge direction and is approximately 120% in the long edge direction. Therefore, the short edge direction of the cholesteric liquid crystal layer carrier  18  is the high stretching direction in which the stretch ratio is relatively high, and the long edge direction thereof is the low stretching direction in which the stretch ratio is relatively low. 
     When the cholesteric liquid crystal layer carrier  18  is manufactured, a large base material may be molded and subjected to biaxial stretching, and then, individual cholesteric liquid crystal layer carriers  18  may be separated and acquired from the base material. In this case as well, the short edge direction of the cholesteric liquid crystal layer carrier  18  matches the high stretching direction, and the long edge direction thereof matches the low stretching direction. 
     In the cholesteric liquid crystal layer forming step, as illustrated in  FIG. 10 , a cholesteric liquid crystal material is applied onto almost the entire area of the plate surface of the cholesteric liquid crystal layer carrier  18 , which is subjected to biaxial stretching through the stretching step, and solidified, and the cholesteric liquid crystal layer  17  is formed. The cholesteric liquid crystal layer  17  has a film shape in almost even thickness across the entire area thereof. 
     In the substrate bonding step, as illustrated in  FIG. 11 , the cholesteric liquid crystal layer carrier  18  in which the cholesteric liquid crystal layer  17  is formed through the above cholesteric liquid crystal layer forming step is bonded to the substrate  19  through the transparent adhesive layer  20 . Specifically, the transparent adhesive layer  20  is previously bonded onto almost the entire area of the plate surface of the substrate  19 . In this state, the surface of the cholesteric liquid crystal layer carrier  18  where the cholesteric liquid crystal layer  17  is formed is directed to the surface of the substrate  19  where the transparent adhesive layer  20  is bonded, and both of the facing surfaces are brought into close contact with each other. Thus, as illustrated in  FIG. 12 , the cholesteric liquid crystal layer carrier  18  and the substrate  19  are bonded, and the light reflection unit  16  is acquired. 
     In the deforming step, the light reflection unit  16 , which is acquired through the above substrate bonding step, with the plate surface thereof in a flat state (refer to  FIG. 12 ) is subjected to biaxial deformation by thermal pressing. Specifically, as illustrated in  FIG. 13 , the light reflection unit  16  with the plate surface thereof in a flat state is sandwiched in the plate thickness direction between one pair of press molds  21  having a plate surface of an approximately spherical shape, and is pressed with a predetermined pressure. The surface of the press mold  21  that is in contact with the light reflection unit  16  has an approximately spherical shape omnidirectionally having the same radius of curvature (for example, approximately 400 mm). At this point, the light reflection unit  16  is subjected to thermal pressing in a temperature environment of larger than or equal to each glass transition temperature of the cholesteric liquid crystal layer carrier  18  and the substrate  19  and less than or equal to the heat setting temperature of the cholesteric liquid crystal layer carrier  18  at the time of biaxial stretching. Specifically, it is preferable to perform thermal pressing in a temperature environment of, for example, approximately 130° C. Accordingly, in a state after biaxial deformation, the three-dimensional shapes of the cholesteric liquid crystal layer carrier  18  and the substrate  19 , which constitute the light reflection unit  16 , after biaxial deformation are suitably maintained, and biaxial deformation generating contraction is avoided. 
     When the light reflection unit  16  is subjected to biaxial deformation, the cholesteric liquid crystal layer carrier  18  is relatively greatly elongated in the long edge direction (X axis direction), which is the large elongation amount direction, and is relatively less elongated in the short edge direction (Y axis direction) which is the small elongation amount direction. The cholesteric liquid crystal layer carrier  18  has the low stretching direction at the time of biaxial stretching, that is, the direction in which the elongation potential is great, matching the large elongation amount direction and has the high stretching direction at the time of biaxial stretching, that is, the direction in which the elongation potential is small, matching the small elongation amount direction. Thus, elongation in the large elongation amount direction is smoothly performed, and elongation in the small elongation amount direction is sufficiently performed. Accordingly, biaxial deformation is unlikely to generate creases and the like in the cholesteric liquid crystal layer  17  disposed on the plate surface of the cholesteric liquid crystal layer carrier  18 . Small deformation such as creases being unlikely to be generated in the cholesteric liquid crystal layer  17  makes distortion unlikely to be generated in the traveling direction of reflective light from the cholesteric liquid crystal layer  17 . Thus, display quality related to the picture projected by the combiner  12  is unlikely to be degraded. The light reflection units  16 , which are subjected to biaxial deformation as above, that exhibit different colors are bonded in the above order by a bonding layer, not illustrated, in the light reflection unit bonding step, and the combiner  12  subjected to biaxial deformation is manufactured (refer to  FIG. 2  and  FIG. 4 ). 
     As described heretofore, the combiner (projection member)  12  of the present embodiment includes the cholesteric liquid crystal layer  17  that is an optical functional layer imparting an optical effect to light, and the cholesteric liquid crystal layer carrier  18  that is an optical functional layer carrier of a plate shape having a plate surface with the cholesteric liquid crystal layer  17 , which is the optical functional layer, disposed thereon, being subjected to biaxial stretching or uniaxial stretching in such a manner that one of two intersecting directions along the plate surface is the low stretching direction in which the stretch ratio is relatively low or is a non-stretching direction in which stretching is not performed and that the other is the high stretching direction in which the stretch ratio is relatively high or is a stretching direction in which stretching is performed, and being subjected to biaxial deformation or uniaxial deformation to have the plate surface deformed into a curved shape in such a manner that the large elongation amount direction in which the amount of elongation by deformation is relatively large or a deformation direction in which deformation is generated matches the low stretching direction or the non-stretching direction and that the small elongation amount direction in which the amount of elongation by deformation is relatively small or a non-deformation direction in which deformation is not generated matches the high stretching direction or the stretching direction. 
     Accordingly, since the cholesteric liquid crystal layer carrier  18  which is the optical functional layer carrier of a plate shape in which the cholesteric liquid crystal layer  17 , which is the optical functional layer imparting an optical effect to light, is disposed on the plate surface is subjected to biaxial stretching or uniaxial stretching, the cholesteric liquid crystal layer carrier  18  can acquire sufficient strength or the like. In addition, the cholesteric liquid crystal layer carrier  18  which is the optical functional layer carrier is subjected to biaxial deformation or uniaxial deformation to have the plate surface of a curved shape. Thus, a projected picture by light to which an optical effect is imparted by the cholesteric liquid crystal layer  17 , which is the optical functional layer disposed on the plate surface, can be visually recognized by a user in an enlarged form. 
     In the case of biaxial deformation of the cholesteric liquid crystal layer carrier  18  which is the optical functional layer carrier, the large elongation amount direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the small elongation amount direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation in the large elongation amount direction by deformation is smoothly performed, and elongation in the small elongation amount direction by deformation is sufficiently performed. Accordingly, stress that may be exerted by deformation on the cholesteric liquid crystal layer carrier  18 , which is the optical functional layer carrier, is suitably relieved, and creases and the like are unlikely to be generated in the cholesteric liquid crystal layer  17  which is the optical functional layer. In the case of uniaxial deformation of the cholesteric liquid crystal layer carrier  18  which is the optical functional layer carrier, the deformation direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the non-deformation direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation in the deformation direction by deformation is smoothly performed. Accordingly, stress that may be exerted by deformation on the cholesteric liquid crystal layer carrier  18 , which is the optical functional layer carrier, is suitably relieved, and creases and the like are unlikely to be generated in the cholesteric liquid crystal layer  17  which is the optical functional layer. Accordingly, display quality related to the projected picture by light to which an optical effect is imparted by the cholesteric liquid crystal layer  17 , which is the optical functional layer, is unlikely to be degraded. 
     The cholesteric liquid crystal layer  17  which is the optical functional layer is a light reflection layer that reflects light. Accordingly, the light reflection layer reflecting light enables a projected picture by reflective light to be visually recognized by the user. Since creases and the like are unlikely to be generated in the light reflection layer, display quality related to the projected picture based on reflective light is unlikely to be degraded. 
     The light reflection layer is configured of the cholesteric liquid crystal layer  17  that selectively reflects any one of left handed circularly-polarized light and right handed circularly-polarized light in a specific wavelength range. Accordingly, the cholesteric liquid crystal layer  17  selectively reflecting any one of left handed circularly-polarized light and right handed circularly-polarized light in a specific wavelength range enables the projected picture by reflective light to be visually recognized by the user. Since creases and the like are unlikely to be generated in the cholesteric liquid crystal layer  17 , display quality related to the projected picture based on reflective light is unlikely to be degraded. 
     The combiner  12  includes the substrate  19  that has a plate shape of a larger plate thickness than the cholesteric liquid crystal layer carrier  18  which is the optical functional layer carrier, is directly or indirectly bonded to the cholesteric liquid crystal layer carrier  18  which is the optical functional layer carrier or the cholesteric liquid crystal layer  17  which is the optical functional layer, and is subjected to biaxial deformation or uniaxial deformation in such a manner that one of two intersecting directions along a plate surface of the substrate  19  is the large elongation amount direction or the deformation direction and that the other is the small elongation amount direction or the non-deformation direction. Accordingly, the substrate  19  that has a plate shape of a larger plate thickness than the cholesteric liquid crystal layer carrier  18 , which is the optical functional layer carrier, independently functions to maintain the shape of the combiner  12  in a state after biaxial deformation or uniaxial deformation. 
     Next, the method for manufacturing the combiner  12  of the present embodiment includes the stretching step of performing biaxial stretching or uniaxial stretching of the cholesteric liquid crystal layer carrier  18 , which is the optical functional layer carrier of a plate shape, in such a manner that one of two intersecting directions along the plate surface of the cholesteric liquid crystal layer carrier  18  is the low stretching direction in which the stretch ratio is relatively low or is the non-stretching direction in which stretching is not performed and that the other is the high stretching direction in which the stretch ratio is relatively high or is the stretching direction in which stretching is performed; the cholesteric liquid crystal layer, which is the optical functional layer, forming step (optical functional layer forming step) of forming the cholesteric liquid crystal layer  17 , which is the optical functional layer, on the plate surface of the cholesteric liquid crystal layer carrier  18 , which is the optical functional layer carrier, in a flat state; and the deforming step of deforming the cholesteric liquid crystal layer carrier  18 , which is the optical functional layer carrier, along with the cholesteric liquid crystal layer  17 , which is the optical functional layer, to make the plate surface have a curved shape by biaxial deformation or uniaxial deformation in such a manner that the large elongation amount direction in which the amount of elongation by deformation is relatively large or the deformation direction in which deformation is generated matches the low stretching direction or the non-stretching direction and that the small elongation amount direction in which the amount of elongation by deformation is relatively small or the non-deformation direction in which deformation is not generated matches the high stretching direction or the stretching direction. 
     Accordingly, since the cholesteric liquid crystal layer carrier  18  which is the optical functional layer carrier of a plate shape in which the cholesteric liquid crystal layer  17 , which is the optical functional layer imparting an optical effect to light, is disposed on the plate surface is subjected to biaxial stretching or uniaxial stretching in the stretching step, the cholesteric liquid crystal layer carrier  18  can acquire sufficient strength or the like. In addition, the cholesteric liquid crystal layer carrier  18  which is the optical functional layer carrier is subjected to biaxial deformation or uniaxial deformation to have the plate surface of a curved shape in the deforming step. Thus, a projected picture by light to which an optical effect is imparted by the cholesteric liquid crystal layer  17 , which is the optical functional layer disposed on the plate surface, can be visually recognized by the user in an enlarged form. 
     In the case of biaxial deformation of the cholesteric liquid crystal layer carrier  18 , which is the optical functional layer carrier, in the deforming step, the large elongation amount direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the small elongation amount direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation in the large elongation amount direction by deformation is smoothly performed, and elongation in the small elongation amount direction by deformation is sufficiently performed. Accordingly, stress that may be exerted by deformation on the cholesteric liquid crystal layer carrier  18 , which is the optical functional layer carrier, is suitably relieved, and creases and the like are unlikely to be generated in the cholesteric liquid crystal layer  17  which is the optical functional layer. In the case of uniaxial deformation of the cholesteric liquid crystal layer carrier  18 , which is the optical functional layer carrier, in the deforming step, the deformation direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the non-deformation direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation in the deformation direction by deformation is smoothly performed. Accordingly, stress that may be exerted by deformation on the cholesteric liquid crystal layer carrier  18 , which is the optical functional layer carrier, is suitably relieved, and creases and the like are unlikely to be generated in the cholesteric liquid crystal layer  17  which is the optical functional layer. Accordingly, display quality related to the projected picture by light to which an optical effect is imparted by the cholesteric liquid crystal layer  17 , which is the optical functional layer, is unlikely to be degraded. 
     In the stretching step, the cholesteric liquid crystal layer carrier  18  which is the optical functional layer carrier is heated to a predetermined heat setting temperature. In the deforming step, the cholesteric liquid crystal layer carrier  18 , which is the optical functional layer carrier, and the cholesteric liquid crystal layer  17 , which is the optical functional layer, are subjected to thermal pressing in a temperature environment of higher than or equal to the glass transition temperature of the cholesteric liquid crystal layer carrier  18 , which is the optical functional layer carrier, and less than or equal to the heat setting temperature in the stretching step. If the temperature environment in thermal pressing performed in the deforming step is lower than the glass transition temperature of the cholesteric liquid crystal layer carrier which is the optical functional layer carrier, the deformed shape of the cholesteric liquid crystal layer carrier  18  which is the optical functional layer carrier is unlikely to be maintained. Conversely, if the temperature environment is higher than the heat setting temperature in the stretching step, contraction may be generated in the cholesteric liquid crystal layer carrier  18  which is the optical functional layer carrier. Regarding this point, in the deforming step, as described above, the cholesteric liquid crystal layer carrier  18 , which is the optical functional layer carrier, and the cholesteric liquid crystal layer  17 , which is the optical functional layer, are subjected to thermal pressing in a temperature environment of higher than or equal to the glass transition temperature of the cholesteric liquid crystal layer carrier  18 , which is the optical functional layer carrier, and less than or equal to the heat setting temperature in the stretching step. Thus, the deformed shape of the cholesteric liquid crystal layer carrier  18  which is the optical functional layer carrier can be maintained, and contraction being generated in the cholesteric liquid crystal layer carrier  18  which is the optical functional layer carrier can be avoided. 
     Embodiment 2 
     Embodiment 2 of the present invention will be described with  FIG. 14  to  FIG. 19 . Embodiment 2 illustrates disposing a recess portion  22  in the plate surface of a substrate  119 . Duplicate descriptions of the same structures and effects as above Embodiment 1 will not be provided. 
     As illustrated in  FIG. 14  to  FIG. 16 , the recess portion  22  for facilitating biaxial deformation of the substrate  119  is disposed in the plate surface of the substrate  119  that constitutes a light reflection unit  116  according to the present embodiment. The recess portion  22  is disposed on the plate surface, of both of the outer and inner plate surfaces of the substrate  119 , that is on the opposite side (a side where light is supplied by a projection device  111 ) from a cholesteric liquid crystal layer  117  and cholesteric liquid crystal layer carrier  118  side. The plan view shape of the recess portion  22  is a circularly annular shape (donut shape) that has a constant width along the entire circumference thereof, and the recess portion  22  is arranged to have the center thereof matching the center (a position where two diagonals intersect with each other) of the plate surface of the substrate  119 , that is, concentrically arranged. The recess portion  22  has the same diameter dimension in the short edge direction (Y axis direction) and the long edge direction (X axis direction) of the light reflection unit  116  and has a true circularly annular shape of a constant diameter dimension along the entire circumference. Accordingly, the substrate  119  has isotropic deformability by the recess portion  22 . The reason of employing such a configuration is that the radius of curvature in the short edge direction is the same as the radius of curvature in the long edge direction in the light reflection unit  116  subjected to biaxial deformation. The recess portion  22  is arranged in plural numbers intermittently linearly in the diameter direction. The diameter dimension is smaller near the center of the plate surface of the substrate  119 . The diameter dimension is larger away from the center. The plan view shape of the recess portion  22 , of the plurality of recess portions  22 , that is arranged at the center of the plate surface of the substrate  119  is a circular shape. The adjacent recess portions  22  have almost equal arrangement intervals and are arranged at equal pitches. Specifically, 14 recess portions  22  in the short edge direction and 25 recess portions  22  in the long edge direction in the substrate  119  are linearly arranged, and the arrangement interval is approximately 7 mm. The recess portion  22  has a constant width dimension across the entire area thereof in the depth direction (Z axis direction). Therefore, the sectional shape of a part of the substrate  119  that has a protruding shape in a part where the recess portion is not formed (recess portion non-formation portion) is a quadrangular shape (block shape). The depth dimension of the recess portion  22  is, for example, approximately 1 mm. In other words, the depth dimension of the recess portion  22  is approximately ¼ of the plate thickness dimension of the substrate  119  (for example, approximately 4 mm). Thus, the thickness dimension of a part of the substrate  119  where the recess portion  22  is formed, that is, a recess portion formation portion, is approximately ¾ (for example, approximately 3 mm) of the plate thickness dimension (the thickness dimension of the recess portion non-formation portion in which the recess portion  22  is not formed) of the substrate  119 . 
     The substrate  119 , since having a larger plate thickness than the cholesteric liquid crystal layer carrier  118 , is relatively unlikely to be deformed and tends to be subjected to relatively great stress compared with the cholesteric liquid crystal layer carrier  118  when the light reflection unit  116  is subjected to biaxial deformation by thermal pressing. Meanwhile, if the recess portion  22  that has a concentric shape is formed in the plate surface of the substrate  119 , the part of the substrate  119  where the recess portion  22  is formed (recess portion formation portion) has a small thickness compared with the part where the recess portion  22  is not formed (recess portion non-formation portion). Thus, when the light reflection unit  116  is subjected to biaxial deformation, biaxial deformation is likely to be generated in the substrate  119  along the plan view shape of the recess portion  22 , and stress that may be exerted on the substrate  119  by deformation is relieved. Accordingly, stress on the substrate  119  is unlikely to affect the cholesteric liquid crystal layer  117  and the cholesteric liquid crystal layer carrier  118 , and creases and the like are unlikely to be generated in the cholesteric liquid crystal layer  117 . 
     A method for manufacturing the light reflection unit  116  of such a configuration is acquired by adding the following step to the manufacturing method disclosed in above Embodiment 1. That is, the method for manufacturing the light reflection unit  116  includes a recess portion forming step of forming the recess portion  22  in the plate surface of the substrate  119  prior to the substrate bonding step (deforming step). In the recess portion forming step, as illustrated in  FIG. 17 , the recess portion  22  illustrated by a double-dot chain line in the drawing is formed by cutting the plate surface of a single side of the manufactured substrate  119  with a cutting device not illustrated. After the recess portion forming step is finished, the substrate bonding step is performed to bond, as illustrated in  FIG. 18 , the cholesteric liquid crystal layer  117  and the cholesteric liquid crystal layer carrier  118  to the plate surface of the substrate  119  on the opposite side from the surface thereof where the recess portion  22  is formed. Then, in the deforming step, as illustrated in  FIG. 19 , the light reflection unit  116  is sandwiched between one pair of press molds  121  and subjected to thermal pressing. At this point, since the recess portion  22  of which the plan view shape is a circularly annular shape is formed in the plate surface of the substrate  119 , biaxial deformation of the substrate  119  is facilitated, and generation of stress is reduced. Specifically, while the substrate  119  is subjected to biaxial deformation in such a manner that the surface thereof where the recess portion  22  is formed has a convex shape, the recess portion formation portion has a smaller thickness than the recess portion non-formation portion in the substrate  119 . Thus, biaxial deformation is easily performed along the plan view shape of the recess portion  22 . The parts of the recess portion non-formation portions having a protruding shape are released into the recess portion  22  to decrease the interval therebetween, and stress that is consequently exerted is relieved. Accordingly, small deformation such as creases caused by stress on the substrate  119  is unlikely to be generated in the cholesteric liquid crystal layer  117 . Thus, distortion is unlikely to be generated in the traveling direction of reflective light from the cholesteric liquid crystal layer  117 , and display quality related to the picture projected by a combiner  112  is unlikely to be degraded. 
     As described heretofore, according to the present embodiment, the recess portion  22  of which the plan view shape is a circular shape, an elliptic shape, or a grid shape in the case of biaxial deformation and is a straight linear shape extending in the form of following the deformation direction or a grid shape in the case of uniaxial deformation is disposed in the substrate  119 . The substrate  119 , since having a plate shape of a larger plate thickness than the cholesteric liquid crystal layer carrier  118  which is the optical functional layer carrier, is unlikely to be subjected to biaxial deformation or uniaxial deformation and is subjected to relatively great stress by deformation compared with the cholesteric liquid crystal layer carrier  118 , which is the optical functional layer carrier. Thus, the stress may affect the cholesteric liquid crystal layer carrier  118  which is the optical functional layer carrier and the cholesteric liquid crystal layer  117  which is the optical functional layer. Regarding this point, the recess portion  22  is disposed in the substrate  119 , and the plan view shape of the recess portion  22  is a circular shape, an elliptic shape, or a grid shape in the case of biaxial deformation of the substrate  119 . Thus, biaxial deformation of the substrate  119  can be facilitated. In the case of uniaxial deformation of the substrate  119 , the recess portion  22  is disposed in such a manner that the plan view shape of the recess portion  22  is a straight linear shape extending in the form of following the deformation direction or a grid shape. Thus, uniaxial deformation of the substrate  119  can be facilitated. Accordingly, stress that may be exerted by deformation on the substrate  119  is relieved, and the stress is unlikely to affect the cholesteric liquid crystal layer carrier  118  which is the optical functional layer carrier and the cholesteric liquid crystal layer  117  which is the optical functional layer. Thus, creases and the like are unlikely to be generated in the cholesteric liquid crystal layer  117  which is the optical functional layer. 
     Embodiment 3 
     Embodiment 3 of the present invention will be described with  FIG. 20 . Embodiment 3 illustrates filling a recess portion  222  with a transparent resin material  23  from above Embodiment 2. Duplicate descriptions of the same structures and effects as above Embodiment 2 will not be provided. 
     As illustrated in  FIG. 20 , the transparent resin material  23  is disposed in the form of filling a recess portion  222  in a substrate  219  according to the present embodiment. The transparent resin material  23  fills all recess portions  222  and is disposed in the form of covering almost the entire area of the plate surface of the substrate  219 . The outermost surface of the transparent resin material  23  has a spherical shape that is parallel to the plate surface of the substrate  219 . The transparent resin material  23  is configured of a synthetic resin material that has excellent light transmissivity and is almost transparent, and the refractive index of the transparent resin material  23  is almost the same as that of a synthetic resin material constituting the substrate  219 . Specifically, the transparent resin material  23  is configured of an acrylic resin (PMMA or the like) having a refractive index of, for example, approximately 1.49 and is preferably configured of the same material as the substrate  219 . Accordingly, when light of irradiation from a projection device  211  is transmitted by the transparent resin material  23  and the substrate  219 , diffuse reflection is unlikely to be generated in the interface between the transparent resin material  23  and the substrate  219 . Accordingly, display quality is more unlikely to be degraded. The synthetic resin material constituting the transparent resin material is also an ultraviolet-curable resin material that is cured by ultraviolet rays. 
     In order to dispose the transparent resin material  23  of such a configuration, manufacturing steps of the light reflection unit  216  include a transparent resin material filling step of filling with the transparent resin material  23 . The transparent resin material filling step is performed after the deforming step is finished. The transparent resin material  23  in a state of being uncured and having sufficient fluidity is applied to the surface of the substrate  219  where the recess portion  222  is formed, and the recess portion  222  is filled with the transparent resin material  23 . Then, the applied transparent resin material  23  is irradiated with ultraviolet rays, and the transparent resin material  23  is cured. 
     As described heretofore, according to the present embodiment, the recess portion  222  is filled with the transparent resin material  23  having the same refractive index as the substrate  219  or a cholesteric liquid crystal layer carrier  218  which is the optical functional layer carrier. Accordingly, filling the recess portion  222  with the transparent resin material  23  having the same refractive index as the substrate  219  or the cholesteric liquid crystal layer carrier  218 , which is the optical functional layer carrier, makes diffuse reflection unlikely to be generated in the interface of the recess portion  222 . Accordingly, display quality is more unlikely to be degraded. 
     Embodiment 4 
     Embodiment 4 of the present invention will be described with  FIG. 21  or  FIG. 22 . Embodiment 4 illustrates removing a recess portion  322  after the deforming step from above Embodiment 2. Duplicate descriptions of the same structures and effects as above Embodiment 2 will not be provided. 
     As illustrated in  FIG. 21  and  FIG. 22 , a method for manufacturing a light reflection unit  316  according to the present embodiment includes a recess portion removing step of removing the recess portion  322  after at least the deforming step. When the deforming step is performed, as illustrated in  FIG. 21 , the recess portion  322  is disposed in the plate surface of a substrate  319 , and biaxial deformation of the substrate  319  is facilitated. In the recess portion removing step that is performed after the deforming step, as illustrated in  FIG. 22 , a part of a protruding shape constituting the recess portion  322  is removed by performing polishing of the surface of the substrate  319 , in the light reflection unit  316  in a state after biaxial deformation, where the recess portion  322  is formed. Accordingly, the recess portion  322  is also removed. Accordingly, the light reflection unit  316  can be thin, generation of diffuse reflection of light that may be caused by the recess portion  322  can be reduced, and the surface of the substrate  319  can be leveled. 
     As described heretofore, according to the present embodiment, included are the substrate bonding step of directly or indirectly bonding the substrate  319  having a plate shape of a larger plate thickness than the cholesteric liquid crystal layer carrier  318 , which is the optical functional layer carrier, to the cholesteric liquid crystal layer carrier  318 , which is the optical functional layer carrier, or to the cholesteric liquid crystal layer  317 , which is the optical functional layer, the substrate bonding step being performed between the cholesteric liquid crystal layer, which is the optical functional layer, forming step (optical functional layer forming step) and the deforming step; the recess portion forming step of forming the recess portion  322  in at least any one of the plate surface of the cholesteric liquid crystal layer carrier  318 , which is the optical functional layer carrier, on the opposite side from the cholesteric liquid crystal layer  317 , which is the optical functional layer, side and the plate surface of the substrate  319  on the opposite side from the cholesteric liquid crystal layer carrier  318 , which is the optical functional layer carrier, side or the cholesteric liquid crystal layer  317 , which is the optical functional layer, side, the recess portion forming step being performed prior to at least the deforming step, the plan view shape of the recess portion  322  being a circular shape, an elliptic shape, or a grid shape in the case of biaxial deformation in the deforming step, and the plan view shape of the recess portion  322  being a straight linear shape extending in the form in the deformation direction or a grid shape in the case of uniaxial deformation in the deforming step; and the recess portion removing step of removing the recess portion  322 , the recess portion removing step being performed after at least the deforming step. Accordingly, the recess portion  322  that is formed in at least any one of the plate surface of the cholesteric liquid crystal layer carrier  318 , which is the optical functional layer carrier, on the opposite side from the cholesteric liquid crystal layer  317 , which is the optical functional layer, side and the plate surface of the substrate  319  on the opposite side from the cholesteric liquid crystal layer carrier  318 , which is the optical functional layer carrier, side or the cholesteric liquid crystal layer  317 , which is the optical functional layer, side in the recess portion forming step can facilitate biaxial deformation of at least any one of the cholesteric liquid crystal layer carrier  318 , which is the optical functional layer carrier, and the substrate  319  in the deforming step since the plan view shape of the recess portion  322  is a circular shape, an elliptic shape, or a grid shape in the case of biaxial deformation of the cholesteric liquid crystal layer carrier  318 , which is the optical functional layer carrier, in the deforming step. In the case of uniaxial deformation of the cholesteric liquid crystal layer carrier  318 , which is the optical functional layer carrier, in the deforming step, the recess portion  322  of which the plan view shape is a straight linear shape extending in the form in the deformation direction or a grid shape is disposed. Thus, the recess portion  322  can facilitate uniaxial deformation of at least any one of the cholesteric liquid crystal layer carrier  318 , which is the optical functional layer carrier, and the substrate  319  in the deforming step. Accordingly, since stress that may be exerted by deformation on the cholesteric liquid crystal layer carrier  318  which is the optical functional layer carrier is relieved, creases and the like are unlikely to be generated in the cholesteric liquid crystal layer  317 , which is the optical functional layer, disposed on the plate surface of the cholesteric liquid crystal layer carrier  318  which is the optical functional layer carrier. In the recess portion removing step that is performed after at least the deforming step, the recess portion  322  is removed. Thus, diffuse reflection of light being caused by the recess portion  322  can be avoided, and degradation of display quality is further reduced. 
     Embodiment 5 
     Embodiment 5 of the present invention will be described with  FIG. 23  or  FIG. 24 . Embodiment 5 illustrates opposite arrangement of a cholesteric liquid crystal layer carrier  418  and a substrate  419  from above Embodiment 2. Duplicate descriptions of the same structures and effects as above Embodiment 2 will not be provided. 
     In a light reflection unit  416  according to the present embodiment, as illustrated in  FIG. 23 , the cholesteric liquid crystal layer carrier  418  is arranged on a side where light is supplied by a projection device  411 , and the substrate  419  is arranged on the opposite side from the side where light is supplied by the projection device  411 . The arrangement of the cholesteric liquid crystal layer carrier  418  and the substrate  419  is configured to be opposite to that disclosed in above Embodiment 2. That is, the light reflection unit  416  is configured by stacking the cholesteric liquid crystal layer carrier  418 , a cholesteric liquid crystal layer  417 , a transparent adhesive layer  420 , and the substrate  419  in this order from the side where light is supplied by the projection device  411 . The substrate  419  is arranged to be the farthest in a view from the projection device  411 . A recess portion  422  is disposed in the plate surface of the substrate  419  on the opposite side from the side where light is supplied by the projection device  411 . With such a configuration, light from the projection device  411  is reflected by the cholesteric liquid crystal layer  417  in a stage before reaching the substrate  419 , and a virtual image is projected. Therefore, since light that is used in the projected picture does not hit the recess portion  422  of the substrate  419 , the light is not subjected to diffuse reflection by the recess portion  422 . Accordingly, display quality related to the projected picture is more unlikely to be degraded. 
     In a method for manufacturing the light reflection unit  416 , as illustrated in  FIG. 24 , when the deforming step is performed after the substrate bonding step, the substrate  419  is subjected to biaxial deformation in such a manner that the surface thereof where the recess portion  422  is formed has a convex shape (refer to  FIG. 23 ). At this point, the recess portion formation portion having a smaller thickness than the recess portion non-formation portion in the substrate  419  allows biaxial deformation to be easily performed along the plan view shape of the recess portion  422 . The recess portion formation portion is deformed in such a manner that the interval between the parts of the recess portion non-formation portions having a protruding shape is increased, and stress that is consequently exerted is relieved. 
     As described heretofore, according to the present embodiment, the substrate  419  in which the recess portion  422  is disposed is arranged on the opposite side of the cholesteric liquid crystal layer  417 , which is the optical functional layer, from the side where light is supplied. Accordingly, an optical effect is imparted to light before the recess portion  422  by the cholesteric liquid crystal layer  417  which is the optical functional layer. Accordingly, the optical performance of the cholesteric liquid crystal layer  417 , which is the optical functional layer, being degraded by the recess portion  422  is avoided. 
     Embodiment 6 
     Embodiment 6 of the present invention will be described with  FIG. 25 . Embodiment 6 illustrates opposite arrangement of a cholesteric liquid crystal layer  517  and a cholesteric liquid crystal layer carrier  518  from above Embodiment 2. Duplicate descriptions of the same structures and effects as above Embodiment 2 will not be provided. 
     In a light reflection unit  516  according to the present embodiment, as illustrated in  FIG. 25 , the cholesteric liquid crystal layer carrier  518  is arranged on a side where light is supplied by a projection device  511 , and the cholesteric liquid crystal layer  517  is arranged on the opposite side from the side where light is supplied by the projection device  511 . The arrangement of the cholesteric liquid crystal layer  517  and the cholesteric liquid crystal layer carrier  518  is configured to be opposite to that disclosed in above Embodiment 2. That is, the light reflection unit  516  is configured by stacking a substrate  519 , a transparent adhesive layer  520 , the cholesteric liquid crystal layer carrier  518 , and the cholesteric liquid crystal layer  517  in this order from the side where light is supplied by the projection device  511 . The cholesteric liquid crystal layer  517  is arranged to be the farthest in a view from the projection device  511 . 
     Embodiment 7 
     Embodiment 7 of the present invention will be described with  FIG. 26 . Embodiment 7 illustrates opposite arrangement of a cholesteric liquid crystal layer carrier  618  and a substrate  619  from above Embodiment 6. Duplicate descriptions of the same structures and effects as above Embodiment 6 will not be provided. 
     In a light reflection unit  616  according to the present embodiment, as illustrated in  FIG. 26 , the cholesteric liquid crystal layer carrier  618  is arranged on a side where light is supplied by a projection device  611 , and the substrate  619  is arranged on the opposite side from the side where light is supplied by the projection device  611 . The arrangement of the cholesteric liquid crystal layer carrier  618  and the substrate  619  is configured to be opposite to that disclosed in above Embodiment 6. That is, the light reflection unit  616  is configured by stacking a cholesteric liquid crystal layer  617 , the cholesteric liquid crystal layer carrier  618 , a transparent adhesive layer  620 , and the substrate  619  in this order from the side where light is supplied by the projection device  611 . The cholesteric liquid crystal layer  617  is arranged to be the farthest in a view from the projection device  611 . A recess portion  622  is disposed in the plate surface of the substrate  619  on the opposite side from the side where light is supplied by the projection device  611 . 
     Embodiment 8 
     Embodiment 8 of the present invention will be described with  FIG. 27 . Embodiment 8 illustrates disposing a recess portion  722  in a cholesteric liquid crystal layer carrier  718  and not in a substrate  719  from above Embodiment 2. Duplicate descriptions of the same structures and effects as above Embodiment 2 will not be provided. 
     As illustrated in  FIG. 27 , the recess portion  722  for facilitating biaxial deformation is disposed in the plate surface of the cholesteric liquid crystal layer carrier  718  according to the present embodiment. The recess portion  722  is disposed in the plate surface, of both of the outer and inner plate surfaces of the cholesteric liquid crystal layer carrier  718 , that is on the opposite side from a cholesteric liquid crystal layer  717  side (the opposite side from a side where light is supplied by a projection device  711 ). The depth dimension of the recess portion  722  is, for example, approximately 50 μm. In other words, the depth dimension of the recess portion  722  is approximately ½ of the plate thickness dimension of the cholesteric liquid crystal layer carrier  718  (for example, approximately 100 μm). Thus, the thickness dimension of a part of the cholesteric liquid crystal layer carrier  718  where the recess portion  722  is formed, that is, the recess portion formation portion, is approximately ½ (approximately 50 μm) of the plate thickness dimension of the cholesteric liquid crystal layer carrier  718 . The recess portion  722  has a constant width, and the plan view shape thereof is a circularly annular shape. The recess portion  722  is arranged to have the center thereof matching the center (a position where two diagonals intersect with each other) of the plate surface of the cholesteric liquid crystal layer carrier  718 , that is, concentrically arranged. Other configurations related to the recess portion  722  (the number of installations, the arrangement interval, and the like of recess portions  722  in the short edge direction and the long edge direction of the cholesteric liquid crystal layer carrier  718 ) are the same as disclosed in above Embodiment 2, and duplicate descriptions thereof will not be provided. 
     A method for manufacturing a light reflection unit  716  of such a configuration includes the recess portion forming step of forming the recess portion  722  in the plate surface of the cholesteric liquid crystal layer carrier  718 , the recess portion forming step being performed prior to the cholesteric liquid crystal layer forming step (deforming step). In the recess portion forming step, the recess portion  722  illustrated by a double-dot chain line in the drawing is formed by cutting the plate surface of a single side of the manufactured cholesteric liquid crystal layer carrier  718  with the cutting device not illustrated. After the recess portion forming step is finished, the cholesteric liquid crystal layer forming step is performed to form the cholesteric liquid crystal layer  717  on the plate surface of the cholesteric liquid crystal layer carrier  718  on the opposite side from the surface where the recess portion  722  is formed. Then, the substrate bonding step is performed to bond the substrate  719  through a transparent adhesive layer  720  to the surface of the cholesteric liquid crystal layer carrier  718  where the cholesteric liquid crystal layer  717  is formed (the plate surface of the cholesteric liquid crystal layer carrier  718  on the opposite side from the surface where the recess portion  722  is formed). Then, in the deforming step, the light reflection unit  716  is sandwiched between one pair of press molds (not illustrated) and subjected to thermal pressing. At this point, since the recess portion  722  of which the plan view shape is a circularly annular shape is formed in the plate surface of the cholesteric liquid crystal layer carrier  718 , biaxial deformation of the cholesteric liquid crystal layer carrier  718  is facilitated, and generation of stress is reduced. Specifically, while the cholesteric liquid crystal layer carrier  718  is subjected to biaxial deformation in such a manner that the surface thereof where the recess portion  722  is formed has a convex shape, the recess portion formation portion has a smaller thickness than the recess portion non-formation portion in the cholesteric liquid crystal layer carrier  718 . Thus, biaxial deformation is easily performed along the plan view shape of the recess portion  722 . The recess portion formation portion is deformed in such a manner that the interval between the parts of the recess portion non-formation portions having a protruding shape is increased, and stress that is consequently exerted is relieved. 
     As described heretofore, according to the present embodiment, the recess portion  722  of which the plan view shape is a circular shape, an elliptic shape, or a grid shape in the case of biaxial deformation and is a straight linear shape extending in the form of following the deformation direction or a grid shape in the case of uniaxial deformation is disposed in the cholesteric liquid crystal layer carrier  718  which is the optical functional layer carrier. Accordingly, since the plan view shape of the recess portion  722  is a circular shape, an elliptic shape, or a grid shape in the case of biaxial deformation of the cholesteric liquid crystal layer carrier  718  which is the optical functional layer carrier, biaxial deformation of the cholesteric liquid crystal layer carrier  718  which is the optical functional layer carrier can be facilitated. In the case of uniaxial deformation of the cholesteric liquid crystal layer carrier  718  which is the optical functional layer carrier, the recess portion  722  of which the plan view shape is a straight linear shape extending in the form in the deformation direction or a grid shape is disposed. Thus, the recess portion  722  can facilitate uniaxial deformation of the cholesteric liquid crystal layer carrier  718  which is the optical functional layer carrier. Accordingly, since stress that may be exerted by deformation on the cholesteric liquid crystal layer carrier  718  which is the optical functional layer carrier is relieved, creases and the like are unlikely to be generated in the cholesteric liquid crystal layer  717 , which is the optical functional layer, disposed on the plate surface of the cholesteric liquid crystal layer carrier  718  which is the optical functional layer carrier. 
     Embodiment 9 
     Embodiment 9 of the present invention will be described with  FIG. 28 . Embodiment 9 illustrates opposite arrangement of a cholesteric liquid crystal layer carrier  818  and a substrate  819  from above Embodiment 8. Duplicate descriptions of the same structures and effects as above Embodiment 8 will not be provided. 
     In a light reflection unit  816  according to the present embodiment, as illustrated in  FIG. 28 , the cholesteric liquid crystal layer carrier  818  is arranged on a side where light is supplied by a projection device  811 , and the substrate  819  is arranged on the opposite side from the side where light is supplied by the projection device  811 . The arrangement of the cholesteric liquid crystal layer carrier  818  and the substrate  819  is configured to be opposite to that disclosed in above Embodiment 8. That is, the light reflection unit  816  is configured by stacking the cholesteric liquid crystal layer carrier  818 , a cholesteric liquid crystal layer  817 , a transparent adhesive layer  820 , and the substrate  819  in this order from the side where light is supplied by the projection device  811 . The cholesteric liquid crystal layer carrier  818  is arranged to be the farthest in a view from the projection device  811 . A recess portion  822  is disposed in the plate surface of the cholesteric liquid crystal layer carrier  818  on the side where light is supplied by the projection device  811 . 
     Embodiment 10 
     Embodiment 10 of the present invention will be described with  FIG. 29 . Embodiment 10 illustrates disposing a recess portion  922  in a substrate  919  and also in a cholesteric liquid crystal layer carrier  918  from above Embodiment 2. Duplicate descriptions of the same structures and effects as above Embodiment 2 will not be provided. 
     As illustrated in  FIG. 29 , the recess portion  922  is disposed in the cholesteric liquid crystal layer carrier  918  in addition to the substrate  919  in a light reflection unit  916  according to the present embodiment. Specifically, the recess portion  922  is disposed in the plate surface of the substrate  919  on a side where light is supplied by a projection device  911 . Meanwhile, the recess portion  922  is disposed in the plate surface of the cholesteric liquid crystal layer carrier  918  on the opposite side from the side where light is supplied by the projection device  911  (cholesteric liquid crystal layer  917  side). The configuration of the recess portion  922  disposed in the substrate  919  is the same as disclosed in above Embodiment 2, and the configuration of the recess portion  922  disposed in the cholesteric liquid crystal layer carrier  918  is the same as disclosed in above Embodiment 8. According to such a configuration, the cholesteric liquid crystal layer carrier  918  and the substrate  919  are easily subjected to biaxial deformation by the respective recess portions  922  in the deforming step. Thus, stress by deformation is further unlikely to affect the cholesteric liquid crystal layer  917 , and small deformation such as creases is further unlikely to be generated in the cholesteric liquid crystal layer  917 . 
     Embodiment 11 
     Embodiment 11 of the present invention will be described with  FIG. 30 . Embodiment 11 illustrates opposite arrangement of a cholesteric liquid crystal layer carrier  1018  and a substrate  1019  from above Embodiment 10. Duplicate descriptions of the same structures and effects as above Embodiment 10 will not be provided. 
     In a light reflection unit  1016  according to the present embodiment, as illustrated in  FIG. 30 , the cholesteric liquid crystal layer carrier  1018  is arranged on a side where light is supplied by a projection device  1011 , and the substrate  1019  is arranged on the opposite side from the side where light is supplied by the projection device  1011 . The arrangement of the cholesteric liquid crystal layer carrier  1018  and the substrate  1019  is configured to be opposite to that disclosed in above Embodiment 10. That is, the light reflection unit  1016  is configured by stacking the cholesteric liquid crystal layer carrier  1018 , a cholesteric liquid crystal layer  1017 , a transparent adhesive layer  1020 , and the substrate  1019  in this order from the side where light is supplied by the projection device  1011 . The cholesteric liquid crystal layer carrier  1018  is arranged to be the farthest in a view from the projection device  1011 . A recess portion  1022  is disposed in the plate surface of the substrate  1019  on the opposite side from the side where light is supplied by the projection device  1011 , and the recess portion  1022  is disposed in the plate surface of the cholesteric liquid crystal layer carrier  1018  on the side where light is supplied by the projection device  1011 . 
     Embodiment 12 
     Embodiment 12 of the present invention will be described with  FIG. 31  or  FIG. 32 . Embodiment 12 illustrates changing the sectional shape of a recess portion  1122  from above Embodiment 2. Duplicate descriptions of the same structures and effects as above Embodiment 2 will not be provided. 
     As illustrated in  FIG. 31 , the sectional shape of the recess portion  1122  according to the present embodiment is an approximately triangular shape in which the width dimension of the recess portion  1122  is smaller at a larger depth (farther from the surface where the recess portion  1122  is formed) and is conversely larger at a smaller depth (nearer the surface where the recess portion  1122  is formed) in the depth direction (Z axis direction). That is, the recess portion  1122  is formed to have an opening width that increases in a flare shape toward an opening end side. Therefore, the side surface of the recess portion  1122  has an inclined shape with respect to the depth direction. Given that the long edge dimension or the short edge dimension of a substrate  1119  is L, the radius of curvature of the substrate  1119  is r, and the number of recess portions  1122  lined up in the long edge direction or in the short edge direction is n, the inclination angle of the side surface of the recess portion  1122  with respect to the depth direction almost matches θ (the unit thereof is “rad”) that is represented by the equation “L/r(n+1)=θ”. Accordingly, when the substrate  1119  is subjected to biaxial deformation in the deforming step, the above side surfaces that face each other through the recess portion  1122  abuts each other and can control generation of further deformation (refer to  FIG. 32 ). The plan view shape, the arrangement interval, the number of installations, and the like of recess portions  1122  are the same as in above Embodiment 2. 
     In the recess portion forming step that is included in a method for manufacturing a light reflection unit  1116  of such a configuration, as illustrated in  FIG. 31 , the recess portion  1122  of which the sectional shape is an approximately triangular shape is formed by cutting the plate surface of a single side of the manufactured substrate  1119  with the cutting device not illustrated. After the recess portion forming step is finished, the substrate bonding step is performed, and then, the deforming step is performed. In the deforming step, as illustrated in  FIG. 32 , the light reflection unit  1116  is sandwiched between one pair of press molds  1121  and subjected to thermal pressing. In the deforming step, while the substrate  1119  is subjected to biaxial deformation in such a manner that the surface thereof where the recess portion  1122  is formed has a concave shape, biaxial deformation of the substrate  1119  proceeds until the side surfaces that face each other through the recess portion  1122  approach each other by narrowing the recess portion  1122  and abut each other in parallel. Accordingly, since stress that is exerted on the substrate  1119  is relieved, small deformation such as creases is unlikely to be generated in the cholesteric liquid crystal layer  1117 . 
     Embodiment 13 
     Embodiment 13 of the present invention will be described with  FIG. 33 . Embodiment 13 illustrates opposite arrangement of a cholesteric liquid crystal layer  1217  and a cholesteric liquid crystal layer carrier  1218  from above Embodiment 1. Duplicate descriptions of the same structures and effects as above Embodiment 1 will not be provided. 
     In a light reflection unit  1216  according to the present embodiment, as illustrated in  FIG. 33 , the cholesteric liquid crystal layer carrier  1218  is arranged on a side where light is supplied by a projection device  1211 , and the cholesteric liquid crystal layer  1217  is arranged on the opposite side from the side where light is supplied by the projection device  1211 . The arrangement of the cholesteric liquid crystal layer  1217  and the cholesteric liquid crystal layer carrier  1218  is configured to be opposite to that disclosed in above Embodiment 1. That is, the light reflection unit  1216  is configured by stacking a substrate  1219 , a transparent adhesive layer  1220 , the cholesteric liquid crystal layer carrier  1218 , and the cholesteric liquid crystal layer  1217  in this order from the side where light is supplied by the projection device  1211 . The cholesteric liquid crystal layer  1217  is arranged to be the farthest in a view from the projection device  1211 . 
     Embodiment 14 
     Embodiment 14 of the present invention will be described with  FIG. 34 . Embodiment 14 illustrates covering a cholesteric liquid crystal layer  1317  with a cover layer  24  from above Embodiment 13. Duplicate descriptions of the same structures and effects as above Embodiment 13 will not be provided. 
     As illustrated in  FIG. 34 , a light reflection unit  1316  according to the present embodiment includes the cover layer (protective layer)  24  that is arranged in the form of covering the cholesteric liquid crystal layer  1317 . The cover layer  24  is configured of a transparent synthetic resin material and is arranged in the form of covering the entire area of the cholesteric liquid crystal layer  1317  on the opposite side from a cholesteric liquid crystal layer carrier  1318  side. Thus, the cholesteric liquid crystal layer  1317  can be protected. The cover layer  24  is configured of, for example, a hardcoat layer, an overcoat layer, or an oil-repellent coating layer and is formed to be stacked on the cholesteric liquid crystal layer  1317  by a technique such as vapor deposition. 
     Embodiment 15 
     Embodiment 15 of the present invention will be described with  FIG. 35 . Embodiment 15 illustrates disposing an antireflection layer  25  from above Embodiment 1. Duplicate descriptions of the same structures and effects as above Embodiment 1 will not be provided. 
     As illustrated in  FIG. 35 , a light reflection unit  1416  according to the present embodiment is configured in such a manner that the antireflection layer  25  that prevents reflection of light is disposed on both of the outer and inner surfaces of the light reflection unit  1416 . Since generation of surface reflection in the light reflection unit  1416  is reduced by the antireflection layers  25 , the state of the observer visually recognizing a double image is unlikely to be generated. One antireflection layer  25  is arranged in the form of covering almost the entire area of the plate surface of a cholesteric liquid crystal layer carrier  1418  on the opposite side from a cholesteric liquid crystal layer  1417  side. The other antireflection layer  25  is arranged in the form of covering almost the entire area of the plate surface of a substrate  1419  on the opposite side from a transparent adhesive layer  1420  side. Each antireflection layer  25  is configured of a metal film, a dielectric multilayer film, or the like and is formed by vapor deposition directly on the plate surfaces of each of the cholesteric liquid crystal layer carrier  1418  and the substrate  1419 . In addition, each antireflection layer  25  may be made as a film having a surface on which minute protrusions are formed (for example, a Motheye film (“Motheye” is a registered trademark of Dai Nippon Printing Co., Ltd.)), and the film may be bonded to the plate surfaces of each of the cholesteric liquid crystal layer carriers  1418  and the substrate  1419 . 
     Embodiment 16 
     Embodiment 16 of the present invention will be described with  FIG. 36 . Embodiment 16 illustrates changing the number of installations or the like of antireflection layers  1525  from above Embodiment 15. Duplicate descriptions of the same structures and effects as above Embodiment 15 will not be provided. 
     As illustrated in  FIG. 36 , the antireflection layer (second optical functional layer)  1525  according to the present embodiment is installed only on a substrate  1519  side and is not installed on a cholesteric liquid crystal layer carrier  1518  side. Furthermore, the antireflection layer  1525  is not directly disposed on the plate surface of the substrate  1519  and is disposed in an antireflection layer carrier (second optical functional layer carrier)  26 . The plan view shape of the antireflection layer carrier  26  is a widthwise long rectangular shape in the same manner as the light reflection unit  1516 , and the antireflection layer carrier  26  has a plate shape having a predetermined plate thickness. The antireflection layer  1525  is disposed on the plate surface of the antireflection layer carrier  26  on the substrate  1519  side and is arranged to be sandwiched between the antireflection layer carrier  26  and the substrate  1519 . 
     The antireflection layer carrier  26  is configured of a synthetic resin material such as polyethylene terephthalate (PET), has excellent light transmissivity, and is almost transparent. The antireflection layer carrier  26  is preferably configured of the same material as the cholesteric liquid crystal layer carrier  1518 . The antireflection layer carrier  26  acquires high mechanical strength or the like by being subjected to stretching, so-called biaxial stretching, in two orthogonal directions along the plate surface thereof, that is, the short edge direction (Y axis direction) and the long edge direction (X axis direction). The antireflection layer carrier  26  has a stretch ratio (extensibility) varying according to two stretching directions, that is, stretch anisotropy, and has the stretch ratio in the short edge direction (Y axis direction) larger than the stretch ratio in the long edge direction (X axis direction). That is, the antireflection layer carrier  26 , in the same manner as the cholesteric liquid crystal layer carrier  1518 , has the short edge direction (Y axis direction) matching the high stretching direction and has the long edge direction (X axis direction) matching the low stretching direction. Furthermore, when the antireflection layer carrier  26  is subjected to biaxial stretching, the antireflection layer carrier  26  is heated to a temperature (hereinafter, referred to as a heat setting temperature) higher than the glass transition temperature thereof, and the heat setting temperature is almost the same as the heat setting temperature related to the cholesteric liquid crystal layer carrier  1518 . 
     As described above, the antireflection layer carrier  26  has the high stretching direction and the low stretching direction at the time of biaxial stretching that respectively match the high stretching direction and the low stretching direction at the time of biaxial stretching of the cholesteric liquid crystal layer carrier  1518 . Therefore, the antireflection layer carrier  26 , in the same manner as the cholesteric liquid crystal layer carrier  1518 , is subjected to biaxial deformation in such a manner that the large elongation amount direction in which the amount of elongation by deformation is relatively large matches the low stretching direction at the time of biaxial stretching, and that the small elongation amount direction in which the amount of elongation by deformation is relatively small matches the high stretching direction at the time of biaxial stretching. That is, the antireflection layer carrier  26 , in the same manner as the cholesteric liquid crystal layer carrier  1518 , has the low stretching direction at the time of biaxial stretching, that is, the direction in which the elongation potential is great, matching the large elongation amount direction and has the high stretching direction at the time of biaxial stretching, that is, the direction in which the elongation potential is small, matching the small elongation amount direction. Thus, at the time of biaxial deformation, elongation in the large elongation amount direction is smoothly performed, and elongation in the small elongation amount direction is sufficiently performed. Accordingly, since biaxial deformation is unlikely to generate creases and the like in the antireflection layer  1525  disposed on the plate surface of the antireflection layer carrier  26 , the antireflection layer  1525  can properly exhibit optical performance, and display quality is more unlikely to be degraded. 
     As described heretofore, according to the present embodiment, included are the antireflection layer  1525  that is the second optical functional layer imparting an optical effect to light; and the antireflection layer carrier  26  that is the second optical functional layer carrier having a plate surface with the antireflection layer  1525 , which is the second optical functional layer, disposed thereon, being directly or indirectly bonded to the cholesteric liquid crystal layer carrier  1518  which is the optical functional layer carrier, being subjected to biaxial stretching or uniaxial stretching in such a manner that one of two intersecting directions along the plate surface is the low stretching direction or the non-stretching direction and that the other is the high stretching direction or the stretching direction, and furthermore, being subjected to biaxial deformation or uniaxial deformation in such a manner that the large elongation amount direction or the deformation direction matches the low stretching direction or the non-stretching direction and that the small elongation amount direction or the non-deformation direction matches the high stretching direction or the stretching direction. Accordingly, since the antireflection layer carrier  26  which is the second optical functional layer carrier of a plate shape in which the antireflection layer  1525 , which is the second optical functional layer imparting an optical effect to light, is disposed on the plate surface is subjected to biaxial stretching or uniaxial stretching, the antireflection layer carrier  26  can acquire sufficient strength or the like. In addition, the antireflection layer carrier  26  which is the second optical functional layer carrier is directly or indirectly bonded to the cholesteric liquid crystal layer carrier  1518 , which is the optical functional layer carrier, and is subjected to biaxial deformation or uniaxial deformation as follows. That is, in the case of biaxial deformation of the antireflection layer carrier  26  which is the second optical functional layer carrier, the large elongation amount direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the small elongation amount direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation in the large elongation amount direction by deformation is smoothly performed, and elongation in the small elongation amount direction by deformation is sufficiently performed. Accordingly, stress that may be exerted by deformation on the antireflection layer carrier  26 , which is the second optical functional layer carrier, is suitably relieved, and creases and the like are unlikely to be generated in the antireflection layer  1525  which is the second optical functional layer. In the case of uniaxial deformation of the antireflection layer carrier  26  which is the second optical functional layer carrier, the deformation direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the non-deformation direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation in the deformation direction by deformation is smoothly performed. Accordingly, stress that may be exerted by deformation on the antireflection layer carrier  26 , which is the second optical functional layer carrier, is suitably relieved, and creases and the like are unlikely to be generated in the antireflection layer  1525  which is the second optical functional layer. Accordingly, the optical performance of the antireflection layer  1525  which is the second optical functional layer can be favorably secured. 
     The second optical functional layer is configured of the antireflection layer  1525  that prevents reflection of light. Accordingly, the optical performance of the second optical functional layer configured of the antireflection layer  1525  can be favorably secured. 
     Embodiment 17 
     Embodiment 17 of the present invention will be described with  FIG. 37  to  FIG. 39 . Embodiment 17 illustrates changing a method for manufacturing a light reflection unit  1616  from above Embodiment 16. Duplicate descriptions of the same structures and effects as above Embodiment 16 will not be provided. 
     As illustrated in  FIG. 37  to  FIG. 39 , the method for manufacturing the light reflection unit  1616  according to the present embodiment includes a carrier detaching step of detaching a cholesteric liquid crystal layer carrier  1618  and the antireflection layer carrier  1626  after at least the deforming step. Specifically, in the method for manufacturing the light reflection unit  1616 , the substrate bonding step is performed to bond, as illustrated in  FIG. 37 , a cholesteric liquid crystal layer  1617  along with the cholesteric liquid crystal layer carrier  1618  and an antireflection layer  1625  along with an antireflection layer carrier  1626  to a substrate  1619 . In the deforming step subsequent to the substrate bonding step, as illustrated in  FIG. 38 , the light reflection unit  1616  is sandwiched between one pair of press molds  1621  and subjected to thermal pressing, and the light reflection unit  1616  is subjected to biaxial deformation. The carrier detaching step is performed after the deforming step. In the carrier detaching step, as illustrated in  FIG. 39 , the cholesteric liquid crystal layer carrier  1618  is detached from the cholesteric liquid crystal layer  1617 , and the antireflection layer carrier  1626  is detached from the antireflection layer  1625  (in  FIG. 39 , the cholesteric liquid crystal layer carrier  1618  and the cholesteric liquid crystal layer carrier  1618  detached are illustrated by a double-dot chain line). Performing the carrier detaching step allows the cholesteric liquid crystal layer  1617  and the antireflection layer  1625  to be held by the substrate  1619 . Accordingly, the light reflection unit  1616  can be thin and lightweight. 
     As described heretofore, according to the present embodiment, included are the substrate bonding step of directly or indirectly bonding the substrate  1619  having a plate shape of a larger plate thickness than the cholesteric liquid crystal layer carrier  1618 , which is the optical functional layer carrier, to the cholesteric liquid crystal layer  1617 , which is the optical functional layer, the substrate bonding step being performed between the cholesteric liquid crystal layer, which is the optical functional layer, forming step and the deforming step; and the carrier detaching step of detaching the cholesteric liquid crystal layer carrier  1618 , which is the optical functional layer carrier, from the cholesteric liquid crystal layer  1617 , which is the optical functional layer, the carrier detaching step being performed after at least the deforming step. Accordingly, since, in the substrate bonding step, the substrate  1619  having a plate shape of a larger plate thickness than the cholesteric liquid crystal layer carrier  1618 , which is the optical functional layer carrier, is directly or indirectly bonded to the cholesteric liquid crystal layer  1617  which is the optical functional layer, the cholesteric liquid crystal layer  1617  which is the optical functional layer is held by the substrate  1619  even if the carrier detaching step is performed after the deforming step to detach the cholesteric liquid crystal layer carrier  1618 , which is the optical functional layer carrier, from the cholesteric liquid crystal layer  1617  which is the optical functional layer. Accordingly, the combiner can be thin and lightweight. In the deforming step, the cholesteric liquid crystal layer carrier  1618  which is the optical functional layer carrier makes creases and the like unlikely to be generated in the cholesteric liquid crystal layer  1617  which is the optical functional layer. 
     Embodiment 18 
     Embodiment 18 of the present invention will be described with  FIG. 40 . Embodiment 18 illustrates disposing an ultraviolet ray absorption layer  27  from above Embodiment 1. Duplicate descriptions of the same structures and effects as above Embodiment 1 will not be provided. 
     As illustrated in  FIG. 40 , a light reflection unit  1716  according to the present embodiment is configured in such a manner that the ultraviolet ray absorption layer (second optical functional layer)  27  that absorbs ultraviolet rays is disposed on both of the outer and inner surfaces of the light reflection unit  1716 . The ultraviolet ray absorption layer  27  has the same function as the antireflection layer disclosed in above Embodiment 15 and also has antireflection function of preventing reflection of light. An ultraviolet ray absorption agent is added to the ultraviolet ray absorption layer  27 , and the ultraviolet ray absorption layer  27  can exhibit ultraviolet ray absorbing function. One ultraviolet ray absorption layer  27  is arranged in the form of covering almost the entire area of the plate surface of a cholesteric liquid crystal layer carrier  1718  on the opposite side from a cholesteric liquid crystal layer  1717  side. The other ultraviolet ray absorption layer  27  is arranged in the form of covering almost the entire area of the plate surface of a substrate  1719  on the opposite side from a transparent adhesive layer  1720  side. The ultraviolet ray absorption layers  27  are not directly disposed on the plate surfaces of the cholesteric liquid crystal layer carrier  1718  and the substrate  1719  and are disposed in an ultraviolet ray absorption layer carrier (second optical functional layer carrier)  28 . The plan view shape of the ultraviolet ray absorption layer carrier  28  is a widthwise long rectangular shape in the same manner as the light reflection unit  1716 , and the ultraviolet ray absorption layer carrier  28  has a plate shape having a predetermined plate thickness. One ultraviolet ray absorption layer  27  is disposed on the plate surface of the ultraviolet ray absorption layer carrier  28  on the cholesteric liquid crystal layer carrier  1718  side and is bonded to the cholesteric liquid crystal layer carrier  1718  through a transparent adhesive layer  29 . The other ultraviolet ray absorption layer  27  is disposed on the plate surface of the ultraviolet ray absorption layer carrier  28  on the substrate  1719  side and is bonded to the substrate  1719  through the transparent adhesive layer  29 . 
     The ultraviolet ray absorption layer carrier  28  is configured of a synthetic resin material such as triacetylcellulose (TAC), has excellent light transmissivity, and is almost transparent. The ultraviolet ray absorption layer carrier  28  acquires high mechanical strength or the like by being subjected to stretching, so-called biaxial stretching, in two orthogonal directions along the plate surface thereof, that is, the short edge direction (Y axis direction) and the long edge direction (X axis direction). The ultraviolet ray absorption layer carrier  28  has a stretch ratio (extensibility) varying according to two stretching directions, that is, stretch anisotropy, and has the stretch ratio in the short edge direction (Y axis direction) larger than the stretch ratio in the long edge direction (X axis direction). That is, the ultraviolet ray absorption layer carrier  28 , in the same manner as the cholesteric liquid crystal layer carrier  1718 , has the short edge direction (Y axis direction) matching the high stretching direction and has the long edge direction (X axis direction) matching the low stretching direction. Furthermore, when the ultraviolet ray absorption layer carrier  28  is subjected to biaxial stretching, the ultraviolet ray absorption layer carrier  28  is heated to a temperature (hereinafter, referred to as a heat setting temperature) higher than the glass transition temperature thereof. 
     As described above, the ultraviolet ray absorption layer carrier  28  has the high stretching direction and the low stretching direction at the time of biaxial stretching that respectively match the high stretching direction and the low stretching direction at the time of biaxial stretching of the cholesteric liquid crystal layer carrier  1718 . Therefore, the ultraviolet ray absorption layer carrier  28 , in the same manner as the cholesteric liquid crystal layer carrier  1718 , is subjected to biaxial deformation in such a manner that the large elongation amount direction in which the amount of elongation by deformation is relatively large matches the low stretching direction at the time of biaxial stretching, and that the small elongation amount direction in which the amount of elongation by deformation is relatively small matches the high stretching direction at the time of biaxial stretching. That is, the ultraviolet ray absorption layer carrier  28 , in the same manner as the cholesteric liquid crystal layer carrier  1718 , has the low stretching direction at the time of biaxial stretching, that is, the direction in which the elongation potential is great, matching the large elongation amount direction and has the high stretching direction at the time of biaxial stretching, that is, the direction in which the elongation potential is small, matching the small elongation amount direction. Thus, at the time of biaxial deformation, elongation in the large elongation amount direction is smoothly performed, and elongation in the small elongation amount direction is sufficiently performed. Accordingly, since biaxial deformation is unlikely to generate creases and the like in the ultraviolet ray absorption layer  27  disposed on the plate surface of the ultraviolet ray absorption layer carrier  28 , the ultraviolet ray absorption layer  27  can property exhibit optical performance, and display quality is more unlikely to be degraded. 
     As described heretofore, according to the present embodiment, the second optical functional layer is configured of the ultraviolet ray absorption layer  27  that selectively absorbs ultraviolet rays. Accordingly, the optical performance of the second optical functional layer configured of the ultraviolet ray absorption layer  27  can be favorably secured. 
     Embodiment 19 
     Embodiment 19 of the present invention will be described with  FIG. 41 . Embodiment 19 illustrates changing a configuration of a cholesteric liquid crystal layer  1817  and disposing a ½ wavelength retardation plate  30  from above Embodiment 18. Duplicate descriptions of the same structures and effects as above Embodiment 18 will not be provided. 
     As illustrated in  FIG. 41 , a light reflection unit  1816  according to the present embodiment is configured in such a manner that the cholesteric liquid crystal layer  1817  has a double layer structure and incorporates the ½ wavelength retardation plate  30 . Specifically, the cholesteric liquid crystal layer  1817  has a stack structure of a first cholesteric liquid crystal layer  1817 A and a second cholesteric liquid crystal layer  1817 B that selectively reflects the same circularly-polarized light as the first cholesteric liquid crystal layer  1817 A. The ½ wavelength retardation plate  30  is for converting any one of left handed circularly-polarized light and right handed circularly-polarized light into another and is arranged in the form of being interposed between the first cholesteric liquid crystal layer  1817 A and the second cholesteric liquid crystal layer  1817 B in the present embodiment. Accordingly, if both left handed circularly-polarized light and right handed circularly-polarized light are included in light that is projected from a projection device  1811  to a combiner  1812 , first, only one circularly-polarized light of both of the left handed circularly-polarized light and the right handed circularly-polarized light is selectively reflected by the first cholesteric liquid crystal layer  1817 A and used in display, and the other circularly-polarized light is transmitted by the second cholesteric liquid crystal layer  1817 B. The other circularly-polarized light transmitted by the first cholesteric liquid crystal layer  1817 A is converted into the one circularly-polarized light by the ½ wavelength retardation plate  30 . Since the second cholesteric liquid crystal layer  1817 B selectively reflects the same circularly-polarized light as the first cholesteric liquid crystal layer  1817 A, the one circularly-polarized light converted by the ½ wavelength retardation plate  30  is reflected and used in display. Accordingly, since both of the left handed circularly-polarized light and the right handed circularly-polarized light included in the light projected from the projection device  1811  to the combiner  1812  are used in display, the efficiency of use of light is excellent. 
     The ½ wavelength retardation plate  30  exhibits retardation compensating function by being subjected to stretching, so-called biaxial stretching, in two orthogonal directions along the plate surface thereof, that is, the short edge direction (Y axis direction) and the long edge direction (X axis direction). The ½ wavelength retardation plate  30  is configured of a synthetic resin material such as polycarbonate (PC), has excellent light transmissivity, and is almost transparent. The ½ wavelength retardation plate  30  has a stretch ratio (extensibility) varying according to two stretching directions, that is, stretch anisotropy, and has the stretch ratio in the short edge direction (Y axis direction) larger than the stretch ratio in the long edge direction (X axis direction). That is, the ½ wavelength retardation plate  30 , in the same manner as a cholesteric liquid crystal layer carrier  1818  and an ultraviolet ray absorption layer carrier  1828 , has the short edge direction (Y axis direction) matching the high stretching direction and has the long edge direction (X axis direction) matching the low stretching direction. Furthermore, when the ½ wavelength retardation plate  30  is subjected to biaxial stretching, the ½ wavelength retardation plate  30  is heated to a temperature (hereinafter, referred to as a heat setting temperature) higher than the glass transition temperature thereof. 
     As described above, the ½ wavelength retardation plate  30  has the high stretching direction and the low stretching direction at the time of biaxial stretching that respectively match the high stretching direction and the low stretching direction at the time of biaxial stretching of the cholesteric liquid crystal layer carrier  1818  and the ultraviolet ray absorption layer carrier  1828 . Therefore, the ½ wavelength retardation plate  30 , in the same manner as the cholesteric liquid crystal layer carrier  1818  and the ultraviolet ray absorption layer carrier  1828 , is subjected to biaxial deformation in such a manner that the large elongation amount direction in which the amount of elongation by deformation is relatively large matches the low stretching direction at the time of biaxial stretching, and that the small elongation amount direction in which the amount of elongation by deformation is relatively small matches the high stretching direction at the time of biaxial stretching. That is, the ½ wavelength retardation plate  30 , in the same manner as the cholesteric liquid crystal layer carrier  1818  and the ultraviolet ray absorption layer carrier  1828 , has the low stretching direction at the time of biaxial stretching, that is, the direction in which the elongation potential is great, matching the large elongation amount direction and has the high stretching direction at the time of biaxial stretching, that is, the direction in which the elongation potential is small, matching the small elongation amount direction. Thus, at the time of biaxial deformation, elongation in the large elongation amount direction is smoothly performed, and elongation in the small elongation amount direction is sufficiently performed. Accordingly, elongation generated by biaxial deformation is unlikely to cause phase modulation in the ½ wavelength retardation plate  30 . In addition, biaxial deformation is unlikely to generate creases and the like in the cholesteric liquid crystal layer  1817  that is arranged in the form of being in contact with the plate surface of the ½ wavelength retardation plate  30 . Accordingly, since the ½ wavelength retardation plate  30  and the cholesteric liquid crystal layer  1817  can properly exhibit optical performance, display quality related to a projected picture by light to which an optical effect is imparted by the ½ wavelength retardation plate  30  and the cholesteric liquid crystal layer  1817  is unlikely to be degraded. 
     As described heretofore, according to the present embodiment, the cholesteric liquid crystal layer  1817  has a stack structure of the first cholesteric liquid crystal layer  1817 A and the second cholesteric liquid crystal layer  1817 B selectively reflecting the same circularly-polarized light as the first cholesteric liquid crystal layer  1817 A, and includes the ½ wavelength retardation plate  30  that is arranged in the form of being interposed between the first cholesteric liquid crystal layer  1817 A and the second cholesteric liquid crystal layer  1817 B and converts any one of left handed circularly-polarized light and right handed circularly-polarized light into another. The ½ wavelength retardation plate  30  is subjected to biaxial stretching or uniaxial stretching in such a manner that one of two intersecting directions along the plate surface thereof is the low stretching direction or the non-stretching direction and that the other is the high stretching direction or the stretching direction, and furthermore, is subjected to biaxial deformation or uniaxial deformation in such a manner that the large elongation amount direction or the deformation direction matches the low stretching direction or the non-stretching direction and that the small elongation amount direction or the non-deformation direction matches the high stretching direction or the stretching direction. Accordingly, since the ½ wavelength retardation plate  30  arranged in the form of being interposed between the first cholesteric liquid crystal layer  1817 A and the second cholesteric liquid crystal layer  1817 B can convert any one of left handed circularly-polarized light and right handed circularly-polarized light into another circularly-polarized light, the first cholesteric liquid crystal layer  1817 A and the second cholesteric liquid crystal layer  1817 B that selectively reflect the same circularly-polarized light can efficiently reflect light to be used in projection, and the efficiency of use of light is excellent. In addition, in the case of biaxial deformation of the ½ wavelength retardation plate  30 , the large elongation amount direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the small elongation amount direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation generated by deformation is unlikely to cause phase modulation. In the case of uniaxial deformation of the ½ wavelength retardation plate  30 , the deformation direction matches the low stretching direction at the time of biaxial stretching or the non-stretching direction at the time of uniaxial stretching, and the non-deformation direction matches the high stretching direction at the time of biaxial stretching or the stretching direction at the time of uniaxial stretching. Thus, elongation generated by deformation is unlikely to cause phase modulation. Accordingly, since the ½ wavelength retardation plate  30  can properly exhibit optical performance, display quality related to a projected picture by light to which an optical effect is imparted by the ½ wavelength retardation plate  30  is unlikely to be degraded. 
     Embodiment 20 
     Embodiment 20 of the present invention will be described with  FIG. 42 . Embodiment 20 illustrates disposing an infrared ray absorption layer  31  from above Embodiment 1. Duplicate descriptions of the same structures and effects as above Embodiment 1 will not be provided. 
     As illustrated in  FIG. 42 , a light reflection unit  1916  according to the present embodiment is configured in such a manner that the infrared ray absorption layer (second optical functional layer)  31  that absorbs infrared rays is disposed on both of the outer and inner surfaces of the light reflection unit  1916 . One infrared ray absorption layer  31  is arranged in the form of covering almost the entire area of the plate surface of a cholesteric liquid crystal layer carrier  1918  on the opposite side from a cholesteric liquid crystal layer  1917  side. The other infrared ray absorption layer  31  is arranged in the form of covering almost the entire area of the plate surface of a substrate  1919  on the opposite side from a transparent adhesive layer  1920  side. The infrared ray absorption layers  31  are respectively bonded to the plate surfaces of the cholesteric liquid crystal layer carrier  1918  and the substrate  1919  through a transparent adhesive layer  32 . 
     As described heretofore, according to the present embodiment, the second optical functional layer is configured of the infrared ray absorption layer  31  that selectively absorbs infrared rays. Accordingly, the optical performance of the second optical functional layer configured of the infrared ray absorption layer  31  can be favorably secured. 
     Embodiment 21 
     Embodiment 21 of the present invention will be described with  FIG. 43  to  FIG. 45 . Embodiment 21 illustrates changing the three-dimensional shape of a light reflection unit  2016  and the plan view shape of a recess portion  2022  from above Embodiment 2. Duplicate descriptions of the same structures and effects as above Embodiment 2 will not be provided. 
     As illustrated in  FIG. 43  to  FIG. 45 , the radius of curvature of the light reflection unit  2016  according to the present embodiment varies in the long edge direction (X axis direction) and in the short edge direction (Y axis direction). Specifically, the light reflection unit  2016  is subjected to biaxial deformation in such a manner that the radius of curvature is relatively large in the short edge direction and that the radius of curvature is relatively small in the long edge direction. Therefore, the light reflection unit  2016  has the short edge direction matching a large curvature radius direction in which the radius of curvature is relatively large, and has the long edge direction matching a small curvature radius direction in which the radius of curvature is relatively small. That is, a cholesteric liquid crystal layer carrier  2018  constituting the light reflection unit  2016  is said to be subjected to biaxial deformation in such a manner that the large elongation amount direction in which the amount of elongation by deformation is relatively large matches the long edge direction, that is, the low stretching direction at the time of biaxial stretching, and that the small elongation amount direction in which the amount of elongation by deformation is relatively small matches the short edge direction, that is, the high stretching direction at the time of biaxial stretching. The exterior shape of the light reflection unit  2016  in the long edge direction and the exterior shape of the light reflection unit  2016  in the short edge direction are respectively illustrated in  FIG. 44  and  FIG. 45  by double-dot chain lines. 
     As illustrated in  FIG. 43 , the plan view shape of the recess portion  2022  disposed in the substrate  2019  constituting the light reflection unit  2016  is a circularly annular shape that is heightwise long and flat, that is, an elliptically annular shape. The recess portion  2022  has a long axis direction matching the Y axis direction, that is, the small elongation amount direction and the high stretching direction of the cholesteric liquid crystal layer carrier  2018 , and has a short axis direction matching the X axis direction, that is, the large elongation amount direction and the low stretching direction of the cholesteric liquid crystal layer carrier  2018 . The width dimension of the recess portion  2022  successively changes in the circumferential direction. For example, the width dimension in the short axis direction is approximately half of the width dimension in the long axis direction. Biaxial deformation is likely to be generated in the substrate  2019  along the above plan view shape of the recess portion  2022 , and the substrate  2019  has anisotropic deformability by the recess portion  2022 . The reason of employing such a configuration is that the radius of curvature in the short edge direction is different from the radius of curvature in the long edge direction in the light reflection unit  2016  subjected to biaxial deformation. The recess portion  2022  is arranged to have the center thereof matching the center (a position where two diagonals intersect with each other) of the plate surface of the substrate  2019 , that is, concentrically arranged, and is arranged in plural numbers intermittently linearly in the diameter direction. The arrangement interval of the plurality of recess portions  2022  is relatively large in the long axis direction and is relatively small in the short axis direction. The plan view shape of the recess portion  2022 , of the plurality of recess portions  2022 , that is arranged at the center of the plate surface of the substrate  2019  is a heightwise long elliptic shape. 
     A method for manufacturing the light reflection unit  2016  of such a configuration includes the recess portion forming step in the same manner as the manufacturing method disclosed in above Embodiment 2. In the deforming step, the light reflection unit  2016  is sandwiched between one pair of press molds (not illustrated) and subjected to thermal pressing. At this point, since the recess portion  2022  of which the plan view shape is a heightwise long elliptically annular shape is formed in the plate surface of the substrate  2019 , biaxial deformation of the substrate  2019  is facilitated, and generation of stress is reduced. Specifically, while the substrate  2019  is subjected to biaxial deformation in such a manner that the surface thereof where the recess portion  2022  is formed has a concave shape, the recess portion formation portion has a smaller thickness than the recess portion non-formation portion in the substrate  2019 . Thus, biaxial deformation is easily performed along the plan view shape of the recess portion  2022 . At this point, since the long axis direction of the recess portion  2022  (a small width direction in which the width dimension is relatively small; a small arrangement interval direction in which the arrangement interval is relatively small) matches the small curvature radius direction in which the radius of curvature of the substrate  2019  is relatively small, relatively large deformation is easily generated in the substrate  2019  as illustrated in  FIG. 45 . Meanwhile, since the short axis direction of the recess portion  2022  (a large width direction in which the width dimension is relatively large; a large arrangement interval direction in which the arrangement interval is relatively large) matches the large curvature radius direction in which the radius of curvature of the substrate  2019  is relatively large, relatively small deformation is easily generated in the substrate  2019  as illustrated in  FIG. 44 . Accordingly, since biaxial deformation is unlikely to generate stress on the substrate  2019 , stress on the substrate  2019  is unlikely to cause small deformation such as creases in the cholesteric liquid crystal layer  2017 . 
     Embodiment 22 
     Embodiment 22 of the present invention will be described with  FIG. 46  to  FIG. 48 . Embodiment 22 illustrates changing the three-dimensional shape of a light reflection unit  2116  and the plan view shape of a recess portion  2122  from above Embodiment 21. Duplicate descriptions of the same structures and effects as above Embodiment 21 will not be provided. 
     As illustrated in  FIG. 46  to  FIG. 48 , the light reflection unit  2116  according to the present embodiment is subjected to biaxial deformation in such a manner that the radius of curvature thereof is relatively small in the short edge direction and that the radius of curvature thereof is relatively large in the long edge direction. Therefore, the light reflection unit  2116  has the short edge direction matching the small curvature radius direction in which the radius of curvature is relatively small, and has the long edge direction matching the large curvature radius direction in which the radius of curvature is relatively large. The light reflection unit  2116  does not have a large difference between the radii of curvature in the short edge direction and in the long edge direction. Accordingly, a cholesteric liquid crystal layer carrier  2118  constituting the light reflection unit  2116  is subjected to biaxial deformation in such a manner that the large elongation amount direction in which the amount of elongation by deformation is relatively large matches the long edge direction, that is, the low stretching direction at the time of biaxial stretching, and that the small elongation amount direction in which the amount of elongation by deformation is relatively small matches the short edge direction, that is, the high stretching direction at the time of biaxial stretching. The exterior shape of the light reflection unit  2116  in the long edge direction and the exterior shape of the light reflection unit  2116  in the short edge direction are respectively illustrated in  FIG. 47  and  FIG. 48  by double-dot chain lines. 
     As illustrated in  FIG. 46 , the plan view shape of the recess portion  2122  disposed in a substrate  2119  constituting the light reflection unit  2116  is a circularly annular shape that is widthwise long and flat, that is, an elliptically annular shape. The recess portion  2122  has a long axis direction matching the X axis direction, that is, the large elongation amount direction and the low stretching direction of the cholesteric liquid crystal layer carrier  2118 , and has a short axis direction matching the Y axis direction, that is, the small elongation amount direction and the high stretching direction of the cholesteric liquid crystal layer carrier  2118 . The width dimension of the recess portion  2122  successively changes in the circumferential direction. For example, the width dimension in the long axis direction is approximately half of the width dimension in the short axis direction. The arrangement interval of a plurality of the recess portions  2122  is relatively small in the long axis direction and is relatively large in the short axis direction. The plan view shape of the recess portion  2122 , of the plurality of recess portions  2122 , that is arranged at the center of the plate surface of the substrate  2119  is a widthwise long elliptic shape. 
     A method for manufacturing the light reflection unit  2116  of such a configuration includes the recess portion forming step in the same manner as the manufacturing method disclosed in above Embodiments 2 and 22. In the deforming step, the light reflection unit  2116  is sandwiched between one pair of press molds (not illustrated) and subjected to thermal pressing. At this point, since the recess portion  2122  of which the plan view shape is a widthwise long elliptically annular shape is formed in the plate surface of the substrate  2119 , biaxial deformation of the substrate  2119  is facilitated, and generation of stress is reduced. Specifically, while the substrate  2119  is subjected to biaxial deformation in such a manner that the surface thereof where the recess portion  2122  is formed has a concave shape, the recess portion formation portion has a smaller thickness than the recess portion non-formation portion in the substrate  2119 . Thus, biaxial deformation is easily performed along the plan view shape of the recess portion  2122 . At this point, since the short axis direction of the recess portion  2122  (the small width direction in which the width dimension is relatively small; the small arrangement interval direction in which the arrangement interval is relatively small) matches the small curvature radius direction in which the radius of curvature of the substrate  2119  is relatively small, relatively large deformation is easily generated in the substrate  2119  as illustrated in  FIG. 47 . Meanwhile, since the long axis direction of the recess portion  2122  (the large width direction in which the width dimension is relatively large; the large arrangement interval direction in which the arrangement interval is relatively large) matches the large curvature radius direction in which the radius of curvature of the substrate  2119  is relatively large, relatively small deformation is easily generated in the substrate  2119  as illustrated in  FIG. 48 . Accordingly, since biaxial deformation is unlikely to generate stress on the substrate  2119 , stress on the substrate  2119  is unlikely to cause small deformation such as creases in a cholesteric liquid crystal layer  2117 . 
     Embodiment 23 
     Embodiment 23 of the present invention will be described with  FIG. 49  or  FIG. 50 . Embodiment 23 illustrates changing the three-dimensional shape of a light reflection unit  2216  and the plan view shape of a recess portion  2222  from above Embodiment 2. Duplicate descriptions of the same structures and effects as above Embodiment 2 will not be provided. 
     As illustrated in  FIG. 49 , the light reflection unit  2216  according to the present embodiment is subjected to uniaxial deformation in which the light reflection unit  2216  is not deformed in the short edge direction (Y axis direction) and is selectively deformed in only the long edge direction (X axis direction). That is, the long edge direction of the light reflection unit  2216  is the deformation direction in which deformation is generated at the time of uniaxial deformation, and the short edge direction thereof is the non-deformation direction in which deformation is not generated at the time of uniaxial deformation. Meanwhile, in the same manner as above Embodiments 1 and 2, a cholesteric liquid crystal layer carrier (not illustrated) constituting the light reflection unit  2216  has the long edge direction matching the low stretching direction at the time of biaxial stretching and has the short edge direction matching the high stretching direction at the time of biaxial stretching (refer to  FIG. 9 ). Therefore, the cholesteric liquid crystal layer carrier is subjected to uniaxial deformation in such a manner that the deformation direction in which deformation is generated matches the long edge direction, that is, the low stretching direction at the time of biaxial stretching, and that the non-deformation direction in which deformation is not generated matches the short edge direction, that is, the high stretching direction at the time of biaxial stretching. The plate surface of the light reflection unit  2216  subjected to uniaxial deformation has an arc shape that has a curvature in only the long edge direction. 
     As illustrated in  FIG. 50 , the recess portion  2222  disposed in a substrate  2219  constituting the light reflection unit  2216  extends in the short edge direction of the substrate  2219  and has a straight linear shape of a constant width (a band shape; a stripe shape). The recess portion  2222  has an extending direction matching the Y axis direction, that is, the non-deformation direction of the substrate  2219  and the high stretching direction of the cholesteric liquid crystal layer carrier and has a width direction matching the X axis direction, that is, the deformation direction of the substrate  2219  and the low stretching direction of the cholesteric liquid crystal layer carrier. The recess portion  2222  is arranged in plural numbers intermittently linearly in the width direction at almost constant arrangement intervals. That is, the direction in which the recess portions  2222  are lined up matches the X axis direction. 
     A method for manufacturing the light reflection unit  2216  of such a configuration includes the recess portion forming step in the same manner as the manufacturing method disclosed in above Embodiment 2. In the deforming step, the light reflection unit  2216  is sandwiched between one pair of press molds (not illustrated) and subjected to thermal pressing. Specifically, when thermal pressing is performed, the light reflection unit  2216  with the plate surface thereof in a flat state is sandwiched in the plate thickness direction between one pair of press molds (not illustrated) having a plate surface of an arc shape that has a curvature in only the long edge direction, and is pressed with a predetermined pressure. When the light reflection unit  2216  is subjected to uniaxial deformation, the cholesteric liquid crystal layer carrier is elongated in the long edge direction (X axis direction), which is the deformation direction, and is almost not elongated in the short edge direction (Y axis direction) which is the non-deformation direction. The cholesteric liquid crystal layer carrier has the low stretching direction at the time of biaxial stretching, that is, the direction in which the elongation potential is great, matching the deformation direction and has the high stretching direction at the time of biaxial stretching, that is, the direction in which the elongation potential is small, matching the non-deformation direction. Thus, elongation in the deformation direction is smoothly performed. Accordingly, uniaxial deformation is unlikely to generate creases and the like in a cholesteric liquid crystal layer that is disposed on the plate surface of the cholesteric liquid crystal layer carrier. Small deformation such as creases being unlikely to be generated in the cholesteric liquid crystal layer makes distortion unlikely to be generated in the traveling direction of reflective light from the cholesteric liquid crystal layer. Thus, display quality related to a picture projected by a combiner  2212  is unlikely to be degraded. 
     In the deforming step, since the recess portion  2222  that has a straight linear shape extending in the short edge direction is formed in the plate surface of the substrate  2219 , uniaxial deformation is facilitated, and generation of stress is reduced. Specifically, while the substrate  2219  is subjected to uniaxial deformation in such a manner that the surface thereof where the recess portion  2222  is formed has a concave shape, the recess portion formation portion has a smaller thickness than the recess portion non-formation portion in the substrate  2219 . Thus, uniaxial deformation is easily performed along the plan view shape of the recess portion  2222 . At this point, as illustrated in  FIG. 50 , since the extending direction of the recess portion  2222  matches the non-deformation direction of the substrate  2219  and the width direction of the recess portion  2222  (the direction in which the recess portions  2222  are lined up) matches the deformation direction of the substrate  2219 , deformation is easily generated in the long edge direction in the substrate  2219  as illustrated in  FIG. 49 . Accordingly, since uniaxial deformation is unlikely to generate stress on the substrate  2219 , stress on the substrate  2219  is unlikely to cause small deformation such as creases in the cholesteric liquid crystal layer. 
     Embodiment 24 
     Embodiment 24 of the present invention will be described with  FIG. 51  or  FIG. 52 . Embodiment 24 illustrates changing the three-dimensional shape of a light reflection unit  2316  and the plan view shape of a recess portion  2322  from above Embodiment 23. Duplicate descriptions of the same structures and effects as above Embodiment 23 will not be provided. 
     As illustrated in  FIG. 51 , the light reflection unit  2316  according to the present embodiment is subjected to uniaxial deformation in which the light reflection unit  2316  is not deformed in the long edge direction (X axis direction) and is selectively deformed in only the short edge direction (Y axis direction). That is, the short edge direction of the light reflection unit  2316  is the deformation direction in which deformation is generated at the time of uniaxial deformation, and the long edge direction thereof is the non-deformation direction in which deformation is not generated at the time of uniaxial deformation. Meanwhile, in the opposite manner to above Embodiments 1 and 2, a cholesteric liquid crystal layer carrier (not illustrated) constituting the light reflection unit  2316  has the low stretching direction at the time of biaxial stretching matching the short edge direction and has the high stretching direction at the time of biaxial stretching matching the long edge direction. Therefore, the cholesteric liquid crystal layer carrier is subjected to uniaxial deformation in such a manner that the deformation direction in which deformation is generated matches the short edge direction, that is, the low stretching direction at the time of biaxial stretching, and that the non-deformation direction in which deformation is not generated matches the long edge direction, that is, the high stretching direction at the time of biaxial stretching. The plate surface of the light reflection unit  2316  subjected to uniaxial deformation has an arc shape that has a curvature in only the short edge direction. 
     As illustrated in  FIG. 52 , the recess portion  2322  disposed in a substrate  2319  constituting the light reflection unit  2316  extends in the long edge direction of the substrate  2319  and has a straight linear shape of a constant width (a band shape; a stripe shape). The recess portion  2322  has an extending direction matching the X axis direction, that is, the non-deformation direction of the substrate  2319  and the high stretching direction of the cholesteric liquid crystal layer carrier and has a width direction matching the Y axis direction, that is, the deformation direction of the substrate  2319  and the low stretching direction of the cholesteric liquid crystal layer carrier. The recess portion  2322  is arranged in plural numbers intermittently linearly in the width direction at almost constant arrangement intervals. That is, the direction in which the recess portions  2322  are lined up matches the Y axis direction. 
     A method for manufacturing the light reflection unit  2316  of such a configuration includes the recess portion forming step in the same manner as the manufacturing method disclosed in above Embodiment 2. In the deforming step, the light reflection unit  2316  is sandwiched between one pair of press molds (not illustrated) and subjected to thermal pressing. Specifically, when thermal pressing is performed, the light reflection unit  2316  with the plate surface thereof in a flat state is sandwiched in the plate thickness direction between one pair of press molds (not illustrated) having a plate surface of an arc shape that has a curvature in only the short edge direction, and is pressed with a predetermined pressure. When the light reflection unit  2316  is subjected to uniaxial deformation, the cholesteric liquid crystal layer carrier is elongated in the short edge direction (Y axis direction), which is the deformation direction, and is almost not elongated in the long edge direction (X axis direction) which is the non-deformation direction. The cholesteric liquid crystal layer carrier has the low stretching direction at the time of biaxial stretching, that is, the direction in which the elongation potential is great, matching the deformation direction and has the high stretching direction at the time of biaxial stretching, that is, the direction in which the elongation potential is small, matching the non-deformation direction. Thus, elongation in the deformation direction is smoothly performed. Accordingly, uniaxial deformation is unlikely to generate creases and the like in a cholesteric liquid crystal layer that is disposed on the plate surface of the cholesteric liquid crystal layer carrier. Small deformation such as creases being unlikely to be generated in the cholesteric liquid crystal layer makes distortion unlikely to be generated in the traveling direction of reflective light from the cholesteric liquid crystal layer. Thus, display quality related to a picture projected by a combiner  2312  is unlikely to be degraded. 
     In the deforming step, since the recess portion  2322  that has a straight linear shape extending in the long edge direction is formed in the plate surface of the substrate  2319 , uniaxial deformation is facilitated, and generation of stress is reduced. Specifically, while the substrate  2319  is subjected to uniaxial deformation in such a manner that the surface thereof where the recess portion  2322  is formed has a concave shape, the recess portion formation portion has a smaller thickness than the recess portion non-formation portion in the substrate  2319 . Thus, uniaxial deformation is easily performed along the plan view shape of the recess portion  2322 . At this point, as illustrated in  FIG. 52 , since the extending direction of the recess portion  2322  matches the non-deformation direction of the substrate  2319  and the width direction of the recess portion  2322  (the direction in which the recess portions  2322  are lined up) matches the deformation direction of the substrate  2319 , deformation is easily generated in the short edge direction in the substrate  2319  as illustrated in  FIG. 51 . Accordingly, since uniaxial deformation is unlikely to generate stress on the substrate  2319 , stress on the substrate  2319  is unlikely to cause small deformation such as creases in the cholesteric liquid crystal layer. 
     Embodiment 25 
     Embodiment 25 of the present invention will be described with  FIG. 53 . Embodiment 25 illustrates changing the plan view shape of a recess portion  2422  from above Embodiment 2. Duplicate descriptions of the same structures and effects as above Embodiment 2 will not be provided. 
     The plan view shape of the recess portion  2422  that is disposed in a substrate  2419  constituting a light reflection unit  2416  according to the present embodiment is a grid shape as illustrated in  FIG. 53 . Specifically, the plan view shape of the recess portion  2422  is a grid shape in which intersecting parts of a part extending in the long edge direction (X axis direction) of the substrate  2419  and a part extending in the short edge direction (Y axis direction) of the substrate  2419  are connected to each other. With such a configuration, deformation of the substrate  2419  is facilitated in any of a light reflection unit that is subjected to biaxial deformation in the form of having the same radius of curvature in the long edge direction and in the short edge direction as in above Embodiment 2, a light reflection unit that is subjected to biaxial deformation in the form of having a radius of curvature varying in the long edge direction and in the short edge direction as in above Embodiments 21 and 22, and a light reflection unit that is subjected to uniaxial deformation in only one of the long edge direction and the short edge direction as in above Embodiments 23 and 24. That is, in the case of manufacturing multiple types of light reflection units having various three-dimensional shapes, this case can be dealt with if one type of substrate  2419  including the recess portion  2422  is prepared, and manufacturing cost related to the substrate  2419  and the light reflection unit  2416  can be reduced. 
     OTHER EMBODIMENTS 
     The present invention is not limited to the above embodiments described with the drawings. The following embodiments, for example, are also included in the technical scope of the present invention. 
     (1) While above each embodiment illustrates the case of manufacturing the cholesteric liquid crystal layer carrier by biaxial stretching, the present invention can be applied to manufacturing of the cholesteric liquid crystal layer carrier by uniaxial stretching. In this case, the cholesteric liquid crystal layer carrier is subjected to uniaxial stretching in the form of having the stretching direction in which stretching is performed and the non-stretching direction in which stretching is not performed. In the case of biaxial deformation of the light reflection unit, it is preferable to perform biaxial deformation of the cholesteric liquid crystal layer carrier in the form of a large elongation direction and a small elongation direction respectively matching the non-stretching direction and the stretching direction. Meanwhile, in the case of uniaxial deformation of the light reflection unit, it is preferable to perform uniaxial deformation of the cholesteric liquid crystal layer carrier in the form of the deformation direction and the non-deformation direction respectively matching the non-stretching direction and the stretching direction. 
     (2) In addition to above each embodiment, specific numerical values such as each dimension of the combiner (light reflection unit), each radius of curvature of the combiner (light reflection unit), each percentage of elongation required at the time of biaxial deformation of the cholesteric liquid crystal layer carrier, each glass transition temperature of the substrate and the cholesteric liquid crystal layer carrier, the heat setting temperature of the cholesteric liquid crystal layer carrier, and each stretch ratio at the time of biaxial stretching of the cholesteric liquid crystal layer carrier can be appropriately changed. 
     (3) In addition to above Embodiments 2 to 7, 10 to 12, and 21 to 25, the plan view shape of the recess portion, the arrangement interval of the recess portion, the width dimension of the recess portion, the rate of change of the width dimension of the recess portion in the depth direction, and the like can be appropriately changed according to the three-dimensional shape of the light reflection unit subjected to biaxial deformation or uniaxial deformation. 
     (4) While above Embodiments 2 to 7, 10 to 12, and 21 to 25 illustrate the case of performing the recess portion forming step of forming the recess portion in the substrate by cutting after the substrate is manufactured, for example, the substrate may be manufactured by injection molding, and the recess portion may be formed at the time of injection molding. That is, the recess portion forming step can be merged into manufacturing steps of the substrate. Specifically, the recess portion may be formed along with manufacturing of the substrate by forming a recess portion formation pattern on a molding surface of an injection mold for injection molding of the substrate and by transferring the recess portion formation pattern to the plate surface of the substrate at the time of injection molding. 
     (5) While above Embodiments 8 to 11 illustrate the case of performing the recess portion forming step of forming the recess portion in the cholesteric liquid crystal layer carrier by cutting after the cholesteric liquid crystal layer carrier is manufactured, for example, the cholesteric liquid crystal layer carrier may be manufactured by injection molding, and the recess portion may be formed at the time of injection molding. That is, the recess portion forming step can be merged into manufacturing steps of the cholesteric liquid crystal layer carrier. Specifically, the recess portion may be formed along with manufacturing of the cholesteric liquid crystal layer carrier by forming the recess portion formation pattern on the molding surface of the injection mold for injection molding of the cholesteric liquid crystal layer carrier and by transferring the recess portion formation pattern to the plate surface of the cholesteric liquid crystal layer carrier at the time of injection molding. 
     (6) It is obviously possible to employ a configuration of filling the recess portion formed in the substrate disclosed in Embodiments 5 to 7, 10 to 12, and 21 to 25 with the transparent resin material disclosed in above Embodiment 3. 
     (7) It is obviously possible to employ a configuration of filling the recess portion formed in the cholesteric liquid crystal layer carrier disclosed in Embodiments 8 to 11 with the transparent resin material disclosed in above Embodiment 3. 
     (8) It is obviously possible to apply the method for manufacturing the light reflection unit including the recess portion removing step disclosed in above Embodiment 4 to Embodiments 5 to 12 and 21 to 25. 
     (9) Embodiment 14 may be applied to above Embodiments 6 and 7 to cover the cholesteric liquid crystal layer with the cover layer. 
     (10) While above Embodiment 12 illustrates the case of the inclination angle of the side surface of the recess portion with respect to the depth direction having a value that almost matches θ represented by the equation “L/r(n+1)=θ”, the inclination angle of the side surface of the recess portion with respect to the depth direction can obviously have a value larger than θ. 
     (11) It is obviously possible to apply the form of the recess portion disposed in the substrate disclosed in above Embodiment 12 to the recess portion formed in the cholesteric liquid crystal layer carrier disclosed in Embodiments 8 to 11. Similarly, it is obviously possible to apply the form of the recess portion disposed in the substrate disclosed in above Embodiment 12 to the recess portion formed in the substrate disclosed Embodiments 3, 5 to 8, 10, 11, and 21 to 25. 
     (12) While above Embodiment 15 illustrates arranging one pair of antireflection layers, any one antireflection layer may not be provided. 
     (13) While above Embodiment 16 illustrates the case of arranging the antireflection layer and the antireflection layer carrier in the form of being bonded to the substrate, the antireflection layer and the antireflection layer carrier can be arranged in the form of being bonded to the cholesteric liquid crystal layer. In addition, one pair of antireflection layers and one pair of antireflection layer carriers can be arranged in the same manner as above Embodiment 15. 
     (14) While above Embodiment 17 illustrates the case of performing the carrier detaching step of detaching the cholesteric liquid crystal layer carrier and the antireflection layer carrier after the deforming step in the method for manufacturing the light reflection unit that includes the antireflection layer which is an additional optical functional layer, the carrier detaching step of detaching at least the cholesteric liquid crystal layer carrier after the deforming step may be performed in the same manner as Embodiment 17 in the method for manufacturing the light reflection unit that does not include the antireflection layer (the method for manufacturing the light reflection unit that includes the ultraviolet ray absorption layer or the infrared ray absorption layer as another additional optical functional layer, or the method for manufacturing the light reflection unit that includes an additional optical functional layer). In this case, if the antireflection layer carrier exists, the antireflection layer carrier may be detached along with the cholesteric liquid crystal layer carrier in the carrier detaching step. 
     (15) While above Embodiments 18 and 19 illustrate arranging one pair of ultraviolet ray absorption layers and one pair of ultraviolet ray absorption layer carriers, any one ultraviolet ray absorption layer and one ultraviolet ray absorption layer carrier may not be provided. 
     (16) While above Embodiment 19 illustrates the configuration of the cholesteric liquid crystal layer having a double layer structure with the ½ wavelength retardation plate interposed between the layers in the light reflection unit that includes the ultraviolet ray absorption layer which is an additional optical functional layer, it is possible to employ, in the light reflection unit that does not include the ultraviolet ray absorption layer (the light reflection unit that includes the antireflection layer or the infrared ray absorption layer as another additional optical functional layer, or the light reflection unit that includes an additional optical functional layer), the configuration of the cholesteric liquid crystal layer having a double layer structure with the ½ wavelength retardation plate interposed between the layers as in Embodiment 19. 
     (17) While above Embodiments 15 to 18 illustrate the case of disposing the antireflection layer, the ultraviolet ray absorption layer, and the infrared ray absorption layer in the light reflection unit, another additional optical functional layer such as an anti-glare (AG) layer may be disposed in the light reflection unit. 
     (18) It is obviously possible to apply the form of the recess portion disposed in the substrate disclosed in above Embodiments 21 to 25 to the recess portion formed in the cholesteric liquid crystal layer carrier disclosed in Embodiments 8 to 11. Similarly, it is obviously possible to apply the form of the recess portion disposed in the substrate disclosed in above Embodiments 21 to 25 to the recess portion formed in the substrate disclosed Embodiments 3, 5 to 8, 10, and 11. 
     (19) While above each embodiment illustrates the manufacturing method in which the light reflection unit constituting the combiner is individually subjected to biaxial deformation or uniaxial deformation, it is possible to employ a manufacturing method in which the light reflection unit constituting the combiner is stacked and subjected to biaxial deformation or uniaxial deformation in a batched manner in the stacked state. 
     (20) While above each embodiment illustrates the case of orthogonal stretching axes in the cholesteric liquid crystal layer carrier subjected to biaxial stretching, the stretching axes in the cholesteric liquid crystal layer carrier subjected to biaxial stretching may intersect with each other at an angle other than 90 degrees. 
     (21) While above each embodiment illustrates the case of orthogonal deformation axes in the light reflection unit subjected to biaxial deformation, the deformation axes in the light reflection unit subjected to biaxial deformation may intersect with each other at an angle other than 90 degrees. 
     (22) While above each embodiment illustrates the case of the configuration in which the stretching axes in the cholesteric liquid crystal layer carrier subjected to biaxial stretching and the deformation axes in the light reflection unit subjected to biaxial deformation respectively matching the long edge direction and the short edge direction of the light reflection unit (cholesteric liquid crystal layer carrier), it is possible to use a configuration in which at least any one stretching axis in the cholesteric liquid crystal layer carrier subjected to biaxial stretching and one deformation axis in the light reflection unit subjected to biaxial deformation intersect with the long edge direction and the short edge direction of the light reflection unit (cholesteric liquid crystal layer carrier) without matching. 
     (23) While above each embodiment illustrates the light reflection unit as including the substrate, the substrate may not be provided. 
     (24) While above each embodiment illustrates the case of using the cholesteric liquid crystal layers that respectively selectively reflect red light, green light, and blue light, it is possible to use a cholesteric liquid crystal layer that selectively reflects light of a color other than the above three colors (for example, gold light). 
     (25) While above each embodiment illustrates the combiner that includes three light reflection units, the number of light reflection units included in the combiner can be less than or equal to two or larger than or equal to four. 
     (26) While above each embodiment illustrates the combiner that performs color displaying by including three light reflection units respectively selectively reflecting red light, green light, and blue light, the present invention can be applied to a combiner that performs single color displaying (for example, greyscale displaying) with only one light reflection unit. 
     (27) While above each embodiment illustrates the case of using, as the light reflection layer, the cholesteric liquid crystal layer which is one type of wavelength-selective light reflection layer, a dielectric multilayer film can be used as another wavelength-selective light reflection layer. 
     (28) While above each embodiment illustrates the case of using, as the light reflection layer, the cholesteric liquid crystal layer which is one type of wavelength-selective light reflection layer, a half mirror can be used as the combiner by using, as another light reflection layer, a reflection film that does not have wavelength selectivity (non-wavelength-selective light reflection layer). 
     (29) In above each embodiment, it is possible to employ a configuration in which a field lens is interposed between the screen and the combiner. 
     (30) In addition to above each embodiment, a liquid crystal display apparatus that is configured of a liquid crystal panel and a backlight device can be used as the projection device. 
     (31) While above each embodiment illustrates the case of using a laser diode as the illuminant of the projection device, an LED, an organic EL, or the like can also be used. 
     (32) While above each embodiment illustrates the case of arranging the combiner separately from the windshield by supporting the combiner with a sun visor or the like, the combiner can be arranged to be bonded to the windshield. In addition, for example, in the case of configuring the windshield by stacking two sheets of glass, the combiner can be arranged in the form of being sandwiched between the two sheets of glass constituting the windshield. 
     (33) While above each embodiment illustrates the configuration in which the projection device is accommodated in the dashboard, the projection device may be supported by a sun visor or the like, or the projection device may be suspended from the ceiling in the automobile. 
     (34) While above each embodiment illustrates the case of using a MEMS mirror element as the display element of the projection device, a digital micromirror device (DMD) display element or a liquid crystal on silicon (LCOS) can be used. 
     (35) While above each embodiment illustrates the case of using a cholesteric liquid crystal panel as the combiner, a holographic element or a half mirror can also be used as the combiner. 
     (36) While above each embodiment illustrates the head-up display mounted in the automobile, the present invention can be applied to a head-up display that is mounted in an aircraft, an automatic bicycle, a boarding amusement apparatus, and the like. 
     (37) While above each embodiment illustrates the head-up display, the present invention can be applied to a head-mounted display. 
     (38) While above each embodiment illustrates the case of performing thermal pressing in the deforming step included in the method for manufacturing the combiner, in-mold molding, insert molding, three dimension overlay method (TOM) molding, laminate molding, and the like can be performed in the deforming step instead of thermal pressing. In this case, the substrate bonding step and the deforming step can be performed at the same time. In addition, the transparent adhesive layer that bonds the cholesteric liquid crystal layer carrier (optical functional layer carrier) and the substrate may not be provided. In the case of performing the recess portion forming step of forming the recess portion in the substrate, the recess portion forming step can be performed at the same time as the deforming step. 
     (39) While above each embodiment illustrates the case of disposing the bonding layer between the plurality of light reflection units of each color, the bonding layer may not be provided. In this case, for example, a plurality of cholesteric liquid crystal layers of each color can be stacked in order on one cholesteric liquid crystal layer carrier. 
     (40) In addition to above each embodiment, the stacking order of the plurality of light reflection units respectively reflecting light of each color can be appropriately changed. 
     REFERENCE SIGNS LIST 
     
         
         
           
               12 ,  112 ,  1812 ,  2212 ,  2312  COMBINER (PROJECTION MEMBER) 
               17 ,  117 ,  317 ,  417 ,  517 ,  617 ,  717 ,  817 ,  917 ,  1017 ,  1117 ,  1217 ,  1317 ,  1417 ,  1617 ,  1717 ,  1817 ,  1917 ,  2017 ,  2117  CHOLESTERIC LIQUID CRYSTAL LAYER (OPTICAL FUNCTIONAL LAYER, LIGHT REFLECTION LAYER) 
               18 ,  118 ,  318 ,  418 ,  518 ,  618 ,  718 ,  818 ,  918 ,  1018 ,  1218 ,  1318 ,  1418 ,  1518 ,  1618 ,  1718 ,  1818 ,  1918 ,  2018 ,  2118  CHOLESTERIC LIQUID CRYSTAL LAYER CARRIER (OPTICAL FUNCTIONAL LAYER CARRIER) 
               19 ,  119 ,  219 ,  319 ,  419 ,  519 ,  619 ,  719 ,  819 ,  919 ,  1019 ,  1119 ,  1219 ,  1419 ,  1519 ,  1619 ,  1719 ,  1919 ,  2019 ,  2119 ,  2219 ,  2319 ,  2419  SUBSTRATE 
               22 ,  222 ,  322 ,  422 ,  622 ,  722 ,  822 ,  922 ,  1022 ,  1122 ,  2022 ,  2122 ,  2222 ,  2322 ,  2422  RECESS PORTION 
               23  TRANSPARENT RESIN MATERIAL 
               25 ,  1525 ,  1625  ANTIREFLECTION LAYER (SECOND OPTICAL FUNCTIONAL LAYER) 
               26 ,  1626  ANTIREFLECTION LAYER CARRIER (SECOND OPTICAL FUNCTIONAL LAYER CARRIER) 
               27  ULTRAVIOLET RAY ABSORPTION LAYER (SECOND OPTICAL FUNCTIONAL LAYER) 
               28 ,  1828  ULTRAVIOLET RAY ABSORPTION LAYER CARRIER (SECOND OPTICAL FUNCTIONAL LAYER CARRIER) 
               29  ½ WAVELENGTH RETARDATION PLATE INFRARED RAY ABSORPTION LAYER (SECOND OPTICAL FUNCTIONAL LAYER) 
               1817 A FIRST CHOLESTERIC LIQUID CRYSTAL LAYER 
               1817 B SECOND CHOLESTERIC LIQUID CRYSTAL LAYER