Patent Publication Number: US-2020278582-A1

Title: Light Emitting Apparatus And Display Apparatus

Description:
TECHNICAL FIELD 
     The present technology relates to a light emitting apparatus and a display apparatus having, for example, a light emitting section for allowing light to enter a liquid crystal layer. 
     BACKGROUND ART 
     A liquid crystal display apparatus has a liquid crystal panel and a backlight, in which light emitted from the backlight enters the liquid crystal panel. The backlight outputs light with high directivity (see, for example, PTL 1). 
     CITATION LIST 
     Patent Literature 
     PTL 1: Japanese Unexamined Patent Application Publication No. 2009-300508 
     SUMMARY OF THE INVENTION 
     It is desired for a light emitting apparatus applied to such a liquid crystal display apparatus to improve view angle characteristics. 
     It is therefore desirable to provide a light emitting apparatus and a display apparatus that make it possible to improve view angle characteristics. 
     A light emitting apparatus according to an embodiment of the present technology includes: a liquid crystal section having a liquid crystal layer between a first surface and a second surface that face each other; a light emitting section that has a light output surface and outputs light from the light output surface with respect to the first surface in an oblique direction, in which the light output surface faces the first surface of the liquid crystal section; and an optical component facing the second surface of the liquid crystal section and having an interface, in which the interface is inclined with respect to the second surface and has different refractive indices. 
     A display apparatus according to an embodiment of the present technology includes: a liquid crystal panel having a liquid crystal layer between a first surface and a second surface that face each other; a light emitting section that has a light output surface and outputs light from the light output surface with respect to the first surface in an oblique direction, in which the light output surface faces the first surface of the liquid crystal panel; and an optical component facing the second surface of the liquid crystal panel and having an interface, in which the interface is inclined with respect to the second surface and has different refractive indices. 
     In the light emitting apparatus or the display apparatus according to an embodiment of the present technology, the light entered from the light output surface of the light emitting section in the oblique direction with respect to the first surface of the liquid crystal section passes through the liquid crystal layer. The light having passed through the liquid crystal layer is refracted (passes through) and reflected at the interface of the optical component to be extracted. 
     In the light emitting apparatus and the display apparatus according to an embodiment of the present technology, the light emitting section emits the light with respect to the first surface of the liquid crystal section in the oblique direction. This reduces a difference between optical characteristics of the light extracted in a perpendicular direction (a front direction) with respect to the second surface and optical characteristics of the light extracted in the direction inclined from the second surface, compared to a case where the light emitting section outputs light in a perpendicular direction with respect to the first surface of the liquid crystal section. It is thus possible to improve view angle characteristics. It is to be noted that the effects described here are not necessarily limiting, and there may be any of effects set forth in the present disclosure. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWING 
         FIG. 1  is a schematic cross-sectional view of an overall configuration of a display apparatus according to one embodiment of the present technology. 
         FIG. 2  is a perspective view of a schematic configuration of a first prism sheet illustrated in  FIG. 1 . 
         FIG. 3  is a diagram illustrating a surface that configures a projection on the first prism sheet illustrated in  FIG. 2 . 
         FIG. 4A  is a diagram illustrating a light flux where an angle θ illustrated in  FIG. 2  is 45 degrees. 
         FIG. 4B  is a diagram illustrating a light flux where the angle θ illustrated in  FIG. 2  is 20 degrees. 
         FIG. 5A  is a diagram illustrating a light flux where the prism surface illustrated in  FIG. 2  is disposed on side of a light source. 
         FIG. 5B  is a diagram illustrating a light flux where the prism surface illustrated in  FIG. 2  is disposed on an opposite side from the light source. 
         FIG. 6A  is a schematic cross-sectional view of another example (1) of a shape of the projection illustrated in  FIG. 2 . 
         FIG. 6B  is a schematic cross-sectional view of another example (2) of the shape of the projection illustrated in  FIG. 2 . 
         FIG. 6C  is a schematic cross-sectional view of another example (3) of the shape of the projection illustrated in  FIG. 2 . 
         FIG. 7A  is a diagram illustrating sizes of a plurality of surfaces that configure the projection illustrated in  FIG. 6A . 
         FIG. 7B  is a diagram illustrating sizes of a plurality of surfaces that configure the projection illustrated in  FIG. 6B . 
         FIG. 7C  is a diagram illustrating sizes of a plurality of surfaces that configure the projection illustrated in  FIG. 6C . 
         FIG. 8  is a perspective view of a schematic configuration of a second prism sheet illustrated in  FIG. 1 . 
         FIG. 9  is a schematic plan view illustrating an extending direction of the projection on the second prism sheet illustrated in  FIG. 8 . 
         FIG. 10  is a diagram illustrating an operation of the display apparatus illustrated in  FIG. 1 . 
         FIG. 11  is a schematic cross-sectional view of a configuration of a main part of a display apparatus according to a comparison example. 
         FIG. 12A  is a diagram illustrating a change in optical characteristics depending on an angle of viewing the display apparatus illustrated in  FIG. 11 . 
         FIG. 12B  is a diagram illustrating a change in optical characteristics depending on an angle of viewing the display apparatus illustrated in  FIG. 1 . 
         FIG. 13A  is a diagram illustrating a change in color depending on an angle of viewing the display apparatus illustrated in  FIG. 11 . 
         FIG. 13B  is a diagram illustrating a change in color depending on an angle of viewing the display apparatus illustrated in  FIG. 1 . 
         FIG. 14  is a schematic cross-sectional view of a configuration of a first prism sheet according to a modification example. 
         FIG. 15A  is a perspective view of an appearance of an electronic device to which the display apparatus illustrated in  FIG. 1  is applied. 
         FIG. 15B  is a perspective view of another example of the electronic device illustrated in  FIG. 15A . 
     
    
    
     MODES FOR CARRYING OUT THE INVENTION 
     In the following, embodiments of the present technology are described in detail with reference to the drawings. It is to be noted that the description is made in the following order. 
     1. Embodiment (A display apparatus having a light emitting section that outputs light in an oblique direction with respect to a liquid crystal panel)
 
2. Modification Example (An example in which a first prism sheet is bonded to an optical sheet)
 
     1. Embodiment 
     (Configuration of Display Apparatus  1 ) 
       FIG. 1  is a cross-sectional diagram that schematically illustrates a configuration of a main part of a liquid crystal display apparatus (a display apparatus  1 ) according to an embodiment of the present technology. The display apparatus  1  has a light emitting section (a light emitting section  10 ) that functions as a backlight, a liquid crystal panel  20  illuminated by light outputted from a light output surface (a light output surface  10 E) of the light emitting section  10 , and an optical member  30  provided on a surface (a second surface  20 B) on a light extraction side of the liquid crystal panel  20 . The liquid crystal panel  20  has a first surface  20 A that the light outputted from the light emitting section  10  enters and the second surface  20 B that faces the first surface  20 A. The light emitting section  10  is provided on a back surface side (side of the first surface  20 A) of the liquid crystal panel  20 . Here, the liquid crystal panel  20  is a specific example of a “liquid crystal section” according to the present technology. 
     The light emitting section  10  is, for example, a direct backlight, and has a light source  11 , a diffusion plate  12 , a collimation section  13 , a first prism sheet  14 , and a reflective polarizing film  15  in order from the back surface side (side farther from the light output surface  10 E). The light output surface  10 E of the light emitting section  10  is disposed to face the first surface  20 A of the liquid crystal panel  20 . 
     The light emitting section  10  is provided with a plurality of light sources  11  that faces the diffusion plate  12 . The light source  11  includes, for example, LED (Light Emitting Diode). The light source  11  has, for example, a laminated structure including an n-type cladding layer, an active layer, and a p-type cladding layer. The light source  11  also has an n-side electrode electrically coupled to the n-type cladding layer and a p-side electrode electrically coupled to the p-type cladding layer. All of the light sources  11  may output light of the same color. Alternatively, the light emitting section  10  may be provided with the light sources  11  that output light of different colors. 
     The light sources  11  are provided on, for example, a light source substrate (not illustrated). The light source substrate is provided with a wiring line pattern to allow for a light emission control for each drive unit region. The wiring line pattern supplies a drive current to the light sources  11 . This enables local light emission control (local dimming) of the plurality of light sources  11 . 
     The diffusion plate  12  is disposed between the light sources  11  and the collimation section  13 . The diffusion plate  12  is configured to receive light outputted from the light sources  11 . The light entered the diffusion plate  12  is diffused inside the diffusion plate  12 , thereby uniformizing luminance, etc., within the plane. The uniformized light enters the first surface  20 A of the liquid crystal panel  20  via the collimation section  13 . The diffusion plate  12  includes, for example, a resin material such as an acrylic resin or a polycarbonate resin. 
     The collimation section  13  provided between the diffusion plate  12  and the first prism sheet  14  collimates the light uniformized by the diffusion plate  12 . That is, the collimation section  13  outputs light with high directivity in a perpendicular direction with respect to the first surface  20 A of the liquid crystal panel  20 . The collimation section  13  includes, for example, two prism sheets (not illustrated) having projections extending in directions orthogonal to each other (an X direction and a Y direction in  FIG. 1 ). 
     The first prism sheet  14  (a first optical sheet) is provided between the collimation section  13  and the reflective polarizing film  15 , and splits parallel light entering from the collimation section  13  into light fluxes in two directions, for example. The first prism sheet  14  is disposed with respect to each of the collimation section  13  and the reflective polarizing film  15  through an air layer. In the present embodiment, the first prism sheet  14  is provided between the collimation section  13  and the light output surface  10 E, allowing light to be outputted from the light output surface  10 E of the light emitting section  10  with respect to the first surface  20 A of the liquid crystal panel  20  in an oblique direction. Although details will be described later, this makes it possible to improve view angle characteristics. 
       FIG. 2  is a perspective view of a schematic configuration of the first prism sheet  14 . The first prism sheet  14  has a prism surface  14 PS provided with a plurality of belt-like projections  14 P. The plurality of projections  14 P extends in the same direction (the Y direction in  FIG. 2 ), and, on the prism surface  14 PS, the plurality of projections  14 P is arranged in a direction (the X direction in  FIG. 2 ) intersecting a predetermined direction. A cross-sectional shape of the projection  14 P is, for example, triangular. 
     The projection  14 P has a surface (a surface  14 P 1 ) inclined at an angle θ with respect to a perpendicular line PL to the first surface  20 A of the liquid crystal panel  20 , as illustrated in  FIG. 3 , and the angle θ desirably satisfies the following Expression (1). 
       θ≥90-sin −1 ( n 0/ n 1×sin(90−θ))  (1)
 
     n0 . . . Refractive index of substance in contact with prism surface  14 PS 
     n1 . . . Refractive index of projection  14 P 
     For example, the substance in contact with the prism surface  14 PS is air, which satisfies n0=1. Moreover, the projection  14 P includes a transparent (light transmissive) resin material, which satisfies n1=1.4 to 1.8. Applying the n0=1 and the n1=1.4 to 1.8 to Expression (1), it satisfies the angle θ≥25 degrees. That is, the projection  14 P desirably has the surface  14 P 1  that makes the angle θ equal to or larger than 25 degrees with respect to the perpendicular line PL. 
       FIGS. 4A and 4B  illustrate a light flux (a light flux L) that passes through the projection  14 P.  FIG. 4A  illustrates the projection  14 P having the angle θ of 45 degrees, and  FIG. 4B  illustrates the projection  14 P having the angle θ of 20 degrees. In this manner, when the angle θ is less than 25 degrees (when Expression (1) is not satisfied), the light flux that passes through the projection  14 P tends to be split into three or more directions ( FIG. 4B ). The light flux L split into three or more directions makes it difficult to improve the view angle characteristics. Accordingly, it is desirable that the angle θ satisfy the above-described Expression (1). 
     The first prism sheet  14  is preferably disposed with its prism surface  14 PS facing toward the light sources  11 . That is, the prism surface  14 PS is disposed to face the light sources  11  (the collimation section  13 ) and a flat surface opposite to the prism surface  14 PS is disposed to face the liquid crystal panel  20  (the reflective polarizing film  15 ). 
       FIGS. 5A and 5B  illustrate the light fluxes (light fluxes L 1  and L 2 ) passing through the first prism sheet  14 . In  FIG. 5A , the prism surface  14 PS is disposed to face the light sources  11 , and in  FIG. 5B , the prism surface  14 PS is disposed to face the liquid crystal panel  20 . Providing the prism surface  14 PS to face the light sources  11  makes it possible to further increase an angle α formed by the light fluxes L 1  and L 2  split in two directions. Moreover, it is difficult for the light fluxes L 1  and L 2  to diffuse. This makes it possible to further improve the view angle characteristics. 
       FIGS. 6A to 6C  illustrate examples of cross-sectional shape of the projection  14 P. The cross-sectional shape of the projection  14 P may be trapezoidal ( FIG. 6A ). The trapezoidal cross-sectional shape is, for example, a shape of a triangle with one of its corners cut away. By making the cross-sectional shape of the projection  14 P trapezoidal, there is provided, in addition to the surface  14 P 1  forming the angle θ with respect to the perpendicular line PL, a surface (a surface  14 P 2 ) closer to perpendicular with respect to the perpendicular line PL (parallel to the first surface  20 A). The surface  14 P 2  is disposed perpendicular to the perpendicular line PL, for example. In this manner, by providing the projection  14 P with the surface  14 P 2  inclined at an angle different from that of the surface  14 P 1 , it is possible to improve design freedom. For example, by providing the surface  14 P 2  closer to perpendicular with respect to the perpendicular line PL than the surface  14 P 1 , it is possible to suppress reduction in front luminance by the surface  14 P 2  while improving the view angle characteristics by the surface  14 P 1 . 
     As illustrated in  FIG. 6B , the cross-sectional shape of the projection  14 P may be pentagonal to have the surfaces  14 P 1  and  14 P 2 , or the surface  14 P 2  may have a curved surface as illustrated in  FIG. 6C . 
     By providing the projection  14 P with the surfaces  14 P 1  and  14 P 2 , as illustrated in  FIGS. 7A to 7C , it is possible to adjust a distance D 1  (a distance between adjacent surfaces  14 P 1  in the X direction) of the surface  14 P 1  between the adjacent projections  14 P and a distance D 2  (a size of the surface  14 P 2  in the X direction) of the surface  14 P 2 . This makes it possible to further improve the design freedom. D 1 :D 2  is, for example, 42:58. 
     Provided between the first prism sheet  14  and the first surface  20 A of the liquid crystal panel  20  is, for example, the reflective polarizing film  15 . The reflective polarizing film  15  is a luminance increasing member that increases and outputs only a specific polarization component, which member transmits one polarization component among incident light and reflects the other polarization component. By converting the other reflected polarization component into the one polarization component, it is possible to improve utilization efficiency of light. As the reflective polarizing film  15 , for example, a DBEF (Dual Brightness Enhancement Film) may be used. 
     The liquid crystal panel  20  is a transmissive liquid crystal panel that displays a moving image or a still image. The liquid crystal panel  20  has the first surface  20 A disposed to face the reflective polarizing film  15  and to be close to the reflective polarizing film  15 , and the second surface  20 B that is farther from the reflective polarizing film  15  than the first surface  20 A. The shapes of the first surface  20 A and the second surface  20 B is, for example, rectangular (see  FIG. 9  to be described later). The liquid crystal panel  20  has, for example, a pair of substrates and a liquid crystal layer provided between the pair of substrates. The liquid crystal panel  20  may be further provided with a polarizing plate or the like. For example, light outputted from the light emitting section  10  enters one substrate from the first surface  20 A, and it is extracted from the second surface  20 B via the liquid crystal layer and the other substrate. The liquid crystal panel  20  is driven in a VA (Vertical Alignment) method, for example. The liquid crystal panel  20  may be driven in an IPS (In-Plane-Switching) method or in a TN (Twisted Nematic) method. 
     The optical member  30  disposed to face the second surface  20 B of the liquid crystal panel  20  has, for example, an adhesive layer  31  (a first adhesive layer) and a second prism sheet  32  (a second optical sheet). The second prism sheet  32  is bonded to the second surface  20 B of the liquid crystal panel  20  by the adhesive layer  31 . The optical member  30  allows the direction of the light flux having passed through the liquid crystal panel  20  to be changed in the perpendicular direction (a front direction) with respect to the second surface  20 B. 
     The adhesive layer  31  is provided between a prism surface (a prism surface  32 PS in  FIG. 8  to be described later) of the second prism sheet  32  and the second surface  20 B of the liquid crystal panel  20  to fill a gap therebetween. The adhesive layer  31  has a refractive index different from the refractive index of the second prism sheet  32  (more specifically, a projection  32 P in  FIG. 8  to be described later). Therefore, the optical member  30  has interfaces (interfaces  32   sa  and  32   sb ) with different refractive indices on a contact surface between the adhesive layer  31  and the second prism sheet  32 . The adhesive layer  31  includes, for example, a resin material such as acrylic or epoxy, and the refractive index of the adhesive layer  31  is, for example, 1.4 to 1.8. 
       FIG. 8  is a perspective view that schematically illustrates a configuration of the second prism sheet  32 . The second prism sheet  32  has the prism surface  32 PS provided with a plurality of belt-like projections  32 P. The projections  32 P extend, for example, in a predetermined direction (the Y direction in  FIG. 8 ), and the plurality of projections  32 P are arranged on the prism surface  32 PS in a direction (the X direction in  FIG. 8 ) intersecting the predetermined direction. The cross-sectional shape of the projection  32 P is, for example, trapezoidal. 
       FIG. 9  illustrates the extending direction of the projections  32 P together with the extending direction of the projections  14 P on the first prism sheet  14 . The projections  32 P preferably extend in parallel with or substantially in parallel with the projections  14 P on the first prism sheet  14 . The extending direction of the projections  32 P is, for example, no less than 0 degree and no more than 45 degrees with respect to the extending direction of the projections  14 P. 
     The extending direction of the projections  14 P and  32 P is preferably parallel to short sides of the rectangular first surface  20 A and second surface  20 B. That is, the projections  14 P and  32 P extend along the direction (the Y direction in  FIG. 9 ) of the short sides of the rectangular first surface  20 A and second surface  20 B, and the plurality of projections  14 P and  32 P are arranged along the direction (the X direction in  FIG. 9 ) of long sides thereof. By providing the projections  14 P and  32 P in this manner, image quality is retained in a case where an angle of viewing offsets in the direction of the long side from the front of the second surface  20 B. The cross-sectional shape of the projection  32 P may be triangular or pentagonal (see  FIG. 6B ), or a portion of the projection  21 P may have a curved surface (see  FIG. 6C ). The projection  32 P includes, for example, a transparent resin material, and the refractive index of the projection  32 P is 1.4 to 1.8. 
     The second prism sheet  32  is preferably disposed with its prism surface  32 PS provided with such projections  32 P facing toward the liquid crystal panel  20  (the second surface  20 B). That is, the prism surface  32 PS is disposed to face the liquid crystal panel  20  and the adhesive layer  31  is disposed between the prism surface  32 PS and the second surface  20 B of the liquid crystal panel  20 . The prism surface  32 PS of the second prism sheet  32  may be disposed facing away from the liquid crystal panel  20  toward the opposite side. 
     The prism surface  32 PS of the second prism sheet  32  is provided with the interfaces  32   sa  and  32   sb  with different refractive indices between itself and the adhesive layer  31  ( FIG. 1 ). The interfaces  32   sa  and  32   sb  are disposed between the projection  32 P and the adhesive layer  31 . Disposed between the projection  32 P having a trapezoidal cross-sectional shape and the adhesive layer  31  are the interface  32   sa  inclined with respect to the second surface  20 B of the liquid crystal panel  20  and the interface  32   sb  parallel to the second surface  20 B. The interface  32   sa  is preferably inclined by 65 degrees to 88 degrees with respect to the second surface  20 B of the liquid crystal panel  20 . It is sufficient for the interface  32   sb  to have a smaller inclination angle with respect to the second surface  20 B than that of the interface  32   sa . By providing the optical member  30  with the interfaces  32   sa  and  32   sb  having different inclination angles with respect to the second surface  20 B of the liquid crystal panel  20  in this manner, it is possible to improve design freedom. It is sufficient for the optical member  30  to be provided with at least the interface  32   sa.    
     The display apparatus  1  may be provided with a reflective sheet, a phase difference film, a polarizing film, a wavelength conversion sheet, or the like. 
     (Operation of Display Apparatus  1 ) 
     An operation of the display apparatus  1  is described with reference to  FIG. 10 . In the display apparatus  1 , light generated in the light source  11  is, for example, reflected by the reflective sheet (not illustrated) and enters the diffusion plate  12 . In the diffusion plate  12 , the entered light is diffused uniformly. The light diffused in the diffusion plate  12  enters the collimation section  13  to be made into parallel light in the perpendicular direction with respect to the first surface  20 A of the liquid crystal panel  20 . The parallel light enters the prism surface  14 PS of the first prism sheet  14  to be split mainly into the light fluxes L 1  and L 2  in two directions. The light fluxes L 1  and L 2  enters the first surface  20 A of the liquid crystal panel  20  in the oblique direction via the reflective polarizing film  15  and passes through the liquid crystal panel  20 . The light fluxes L 1  and L 2  extracted from the second surface  20 B of the liquid crystal panel  20  are refracted (passes through) and reflected at the interfaces  32   sa  and  32   sb  of the optical member  30  to be extracted mainly in the perpendicular direction (the front direction) with respect to the first surface  20 A of the liquid crystal panel  20 . 
     (Workings and Effects of Display Apparatus  1 ) 
     In the display apparatus  1 , because the light emitting section  10  is provided with the first prism sheet  14 , the light fluxes L 1  and L 2  enter from the light emitting section  10  with respect to the first surface  20 A of the liquid crystal panel  20  in the oblique direction. The light fluxes L 1  and L 2  pass through the liquid crystal layer of the liquid crystal panel  20  while maintaining its traveling direction. This makes it possible to reduce a difference between optical characteristics of the light extracted in the perpendicular direction (front direction) with respect to the second surface  20 B and the optical characteristics of the light extracted in the direction inclined from the second surface  20 B, thereby improving the view angle characteristics. This is described in the following. 
       FIG. 11  illustrates a schematic cross-sectional configuration of a main part of a display apparatus (display apparatus  100 ) according to a comparison example. A light emitting section (light emitting section  110 ) of the display apparatus  100  is not provided with the first prism sheet (the first prism sheet  14  in  FIG. 1 ). In the display apparatus  100 , light outputted from the light source  11  is made into parallel light through the collimation section  13 , and enters from a light output surface (a light output surface  100 E) of the light emitting section  110  in the perpendicular direction with respect to the first surface  20 A of the liquid crystal panel  20 . The light passes through the liquid crystal layer of the liquid crystal panel  20  while maintaining its traveling direction and enters the optical member  30  through the second surface  20 B. 
     In such a display apparatus  100 , the light in the perpendicular direction with respect to the second surface  20 B of the liquid crystal panel  20  enters the optical member  30 . The light is refracted at the interface  32   sa  of the optical member  30 , and a refractive angle thereof depends on a difference between its refractive index and that of the interface  32   sa . Both the adhesive layer  31  and the projection  32 P include a resin material, which makes it difficult to increase the difference in refractive index. Therefore, the traveling direction of the light outputted from the optical member  30  is mainly the perpendicular direction with respect to the second surface  20 B; although a portion of the light is outputted in directions offset from the perpendicular direction, an angular difference between these directions is small. That is, because an angular range for synthesizing (mixing) light extracted as display light is narrow, the difference between the optical characteristics of the light extracted in the front direction and the optical characteristics of the light extracted in the direction offset from the front direction increases. 
     Moreover, in the display apparatus  100 , the light in the perpendicular direction with respect to the first surface  20 A and the second surface  20 B passes through the liquid crystal layer. Therefore, although a visual image is balanced when viewed in the front direction, there is a possibility that the visual image may be severely unbalanced when viewed in the direction offset from the front direction. Especially with the liquid crystal panel  20  driven in the VA method, the image quality is degraded due to an angle of viewing. 
     In this manner, with the display apparatus  100 , in a case of viewing the visual image in the direction offset from the front, the image quality may possibly be severely degraded compared to a case of viewing the visual image in the front direction. For example, with a color visual image, colors of the image vary severely depending on the viewing direction. 
     To the contrary, in the case of the display apparatus  1 , the light fluxes L 1  and L 2  enter from the light emitting section  10  in the oblique direction with respect to the first surface  20 A of the liquid crystal panel  20  and reach the interfaces  32   sa  and  32   sb  of the optical member  30  while maintaining the direction. Accordingly, the traveling direction of the light refracted (passed through) and reflected at the interfaces  32   sa  and  32   sb  encompasses a wider angular range. That is, the angular range of synthesis of light extracted as the display light is wider than that in the case of the display apparatus  100 , allowing for sufficient synthesis of light. 
     Moreover, in the display apparatus  1 , the light in the oblique direction with respect to the first surface  20 A and the second surface  20 B passes through the liquid crystal layer. Accordingly, the difference between the optical characteristics of the light extracted in the front direction and the optical characteristics of the light extracted in the direction offset from the front is reduced compared to the case of the display apparatus  100 . This reduces color variation due to the viewing direction even in the case of the color display image. 
       FIGS. 12A and 12B  respectively illustrate changes in the optical characteristics of the display apparatus  100  and the display apparatus  1  depending on an angle of viewing. Horizontal axes in  FIGS. 12A and 12B  indicate grayscale and vertical axes indicate luminance (a.u.). In the display apparatus  100 , the optical characteristics of the light extracted in the direction (40° and 60°) offset from the front are dramatically different from the optical characteristics of the light extracted in the front direction)(0° ( FIG. 12A ). Especially at the lower grayscale, the difference in the optical characteristics is larger. To the contrary, in the case of the display apparatus  1 , even at the lower grayscale, the optical characteristics of the light extracted in the direction (40° and 60°) offset from the front are approximate to the optical characteristics of the light extracted in the front direction)(0° ( FIG. 12B ). 
       FIGS. 13A and 13B  respectively illustrate color variations (CIE1976) of the display apparatus  100  and the display apparatus  1  depending on an angle of viewing. Horizontal axes in  FIGS. 13A and 13B  indicate grayscale and vertical axes indicate u′. In the display apparatus  100 , the color of the light extracted in the direction (40° and) 60° offset from the front is dramatically different from the color of the light extracted in the front direction)(0° ( FIG. 13A ). Especially at the lower grayscale, the difference in the color is larger. To the contrary, in the case of the display apparatus  1 , even at the lower grayscale, the color of the light extracted in the direction (40° and 60°) offset from the front becomes closer to the color of the light extracted in the front direction) (0°) ( FIG. 13B ). 
     In this manner, with the display apparatus  1 , because the light fluxes L 1  and L 2  in the oblique direction with respect to the first surface  20 A of the liquid crystal panel  20  enters the liquid crystal panel  20  owing to the light emitting section  10 , the difference between the optical characteristics of the light extracted in the front direction (the perpendicular direction with respect to the second surface  20 B of the liquid crystal panel  20 ) and the optical characteristics of the light extracted in the direction offset from the front direction is reduced compared to the case of the display apparatus  100 . It is thus possible to improve the view angle characteristics. 
     Especially with the liquid crystal panel  20  driven in the VA method, it is possible to effectively improve the view angle characteristics. 
     Moreover, the light emitting section  10  is preferably configured to allow for local light emission control. By performing local dimming in conjunction with the visual image displayed on the liquid crystal panel  20 , it is possible to suppress reduction in contrast. 
     As described above, in the display apparatus  1 , the light emitting section  10  outputs the light fluxes L 1  and L 2  in the oblique direction with respect to the first surface  20 A of the liquid crystal panel  20 . This makes it possible to improve the view angle characteristics compared to the case where the light emitting section  10  outputs light in the perpendicular direction with respect to the first surface  20 A of the liquid crystal panel  20  (the display apparatus  100 ). Because such a display apparatus  1  makes it possible to obtain higher view angle characteristics without losing utilization efficiency of light, the display apparatus  1  makes it possible to save energy. 
     While a modification example of the above-described embodiment is described below, components same as those of the above-described embodiment in the following description are denoted with the same reference numerals, and descriptions thereof are omitted where appropriate. 
     Modification Example 
       FIG. 14  schematically illustrates a cross-sectional configuration of the first prism sheet  14  according to a modification example of the above-described embodiment. Although the above-described embodiment is described with reference to the case where the projections  14 P of the first prism sheet  14  are in contact with the air layer, the prism surface  14 PS (the projections  14 P) of the first prism sheet  14  may be bonded to another optical sheet (an optical sheet  16  or a third optical sheet) via an adhesive layer  17  (a second adhesive layer). 
     In this manner, by burying a portion of each projection  14 P in the adhesive layer  17 , there is provided an interface (a surface  14 P 3 ) between the projection  14 P and the adhesive layer  17  in addition to the interface (the surface  14 P 1 ) between the projection  14 P and the air layer. This makes it possible to improve the design freedom. The surface  14 P 3  functions in the same manner as the above-described surface  14 P 2 . 
     Moreover, it is possible to adjust the distance D 1  of the surface  14 P 1  between the adjacent projections  14 P and a distance D 3  (a size of the surface  14 P 3  in the X direction) of the surface  14 P 3 . This makes it possible to further improve the design freedom. D 1 :D 3  is, for example, 45:55. 
     Furthermore, it is also possible to increase strength by bonding a plurality of sheets (the first prism sheet  14  and the optical sheet  16 ) together. The optical sheet  16  may configure the collimation section  13  ( FIG. 1 ). 
     Application Example: Electronic Device 
     In the following, an application example of the display apparatus  1  as described above to an electronic device is described. The electronic device includes, for example, a television apparatus, a medical monitor, a digital signage, a master monitor, a digital camera, a laptop personal computer, a portable terminal device such as a mobile phone, or a video camera. In other words, the above-described display apparatus  1  is applicable to an electronic device in various fields that displays a visual image signal inputted from the outside or the visual image signal generated inside as an image or a visual image. 
       FIGS. 15A and 15B  each illustrate an appearance of a tablet terminal device to which the display apparatus  1  according to the above-described embodiment is applied. The tablet terminal device has, for example, a display section  710  and a non-display section  720 , and the display section  710  includes the display apparatus  1  according to the above-described embodiment. 
     Although the present technology has been described above with reference to the embodiment and modification example, the present technology is not limited to the above-described embodiment and the like and may be modified in a variety of ways. For example, the disposed position and the shape of each section described in the above-described embodiment and the like are merely an example and not limiting. 
     Moreover, the dimension, the dimensional ratio, the shape, and the like of each component illustrated in each drawing are merely an example and the present technology is not limited thereto. 
     Furthermore, although the above-described embodiment and the like have been described taking an example in which the light emitting section  10  is of a direct type, the light emitting section  10  may be an edge-light-type light emitting section  10 . 
     Moreover, although the above-described embodiment and the like have been described taking an example in which the light source  11  is an LED, the light source  11  may include a semiconductor laser or the like. 
     In addition, although the description has been made specifically with reference to a specific example configuration of the light emitting section  10 , the display apparatus  1 , and the like, not all the components may necessarily be included, and other components may be further included. 
     Moreover, materials and the like of each component described in the above-described embodiment are not limiting but other materials and the like may be used. 
     It is to be noted that the effects described herein are merely examples and not limiting, and there may be other effects. 
     The present technology may have the following configurations. 
     (1) 
     A light emitting apparatus including: 
     a liquid crystal section having a liquid crystal layer between a first surface and a second surface that face each other; 
     a light emitting section that has a light output surface and outputs light from the light output surface with respect to the first surface in an oblique direction, the light output surface facing the first surface of the liquid crystal section; and 
     an optical component facing the second surface of the liquid crystal section and having an interface, the interface being inclined with respect to the second surface and having different refractive indices. 
     (2) 
     The light emitting apparatus according to (1), in which the light emitting section includes: 
     a light source; and 
     a first optical sheet provided between the light source and the liquid crystal section and having a first prism surface. 
     (3) 
     The light emitting apparatus according to (2), in which the first prism surface of the first optical sheet is disposed to face the light source. 
     (4) 
     The light emitting apparatus according to (2) or (3), in which the light source includes LED (Light Emitting Diode). 
     (5) 
     The light emitting apparatus according to any one of (2) to (4), in which 
     the first surface and the second surface each have a rectangular shape, and 
     a projection provided on the first prism surface extends in a direction parallel to a short side of the rectangular shape. 
     (6) 
     The light emitting apparatus according to any one of (2) to (5), in which the light emitting section further includes a collimation section that is provided between the light source and the first optical sheet and collimates light outputted from the light source. 
     (7) 
     The light emitting apparatus according to any one of (2) to (6), in which each projection on the first prism surface has a plurality of surfaces having inclination angles that are different from each other with respect to the first surface. 
     (8) 
     The light emitting apparatus according to any one of (2) to (7), in which each projection on the first prism surface has a surface having an angle that is equal to or larger than 25 degrees with respect to a perpendicular line to the first surface. 
     (9) 
     The light emitting apparatus according to any one of (2) to (8), in which the optical component includes: 
     a second optical sheet having a second prism surface that faces the second surface of the liquid crystal section; and 
     a first adhesive layer provided on the second prism surface of the second optical sheet, and configures the interface between the first adhesive layer and the second prism surface. 
     (10) 
     The light emitting apparatus according to (9), in which an extending direction of a projection on the second prism surface is equal to or less than 45 degrees with respect to an extending direction of a projection on the first prism surface. 
     (11) 
     The light emitting apparatus according to any one of (2) to (10), in which the light emitting section further includes: 
     a third optical sheet disposed between the light source and the first optical sheet; and 
     a second adhesive layer that fixes the third optical sheet to the first prism surface. 
     (12) 
     A display apparatus including: 
     a liquid crystal panel having a liquid crystal layer between a first surface and a second surface that face each other; 
     a light emitting section that has a light output surface and outputs light from the light output surface with respect to the first surface in an oblique direction, the light output surface facing the first surface of the liquid crystal panel; and 
     an optical component facing the second surface of the liquid crystal panel and having an interface, the interface being inclined with respect to the second surface and having different refractive indices. 
     (13) 
     The display apparatus according to (12), in which the light emitting section is configured to control light emission locally. 
     (14) 
     The display apparatus according to (12) or (13), in which the liquid crystal panel is configured to be driven in a VA (Vertical Alignment) method. 
     The present application claims priority based on Japanese Patent Application No. 2017-170521 filed with the Japan Patent Office on Sep. 5, 2017, the entire contents of which are incorporated herein by reference. 
     It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and alterations may occur depending on design requirements and other factors insofar as they are within the scope of the appended claims or the equivalents thereof.