TW201430391A - Display device and electronic device - Google Patents

Abstract

A display device includes a display unit having a pixel surface, and a light source device for emitting image display light toward the display unit. The light source device has one or more first light sources for emitting first illumination light, and mutually facing first and second end surfaces. A first light guide plate is provided with a scattering surface formed from a plurality of scattering areas between the first end surface and the second end surface, said first light guide plate scattering the first illumination light by means of the plurality of scattering areas so as to emit the first illumination light to the outside. The first light guide plate is formed into a shape such that the thickness changes between the first end surface and the second end surface, and the first light guide plate satisfies a prescribed condition with respect to the distance in air between the pixel surface and the scattering surface.

Description

Display device and electronic device

The present disclosure relates to a display device and an electronic device that can realize a three-dimensional display or a multiview using a parallax barrier.

As one of the three-dimensional display methods, it is possible to perform a stereoscopic observer under naked eyes without wearing special glasses. As one of display methods for stereoscopic observation under naked eyes, a display device of a parallax barrier method is known. This display device is formed by arranging a parallax barrier on the front surface (display surface side) of the two-dimensional display panel. The general structure of the parallax barrier is alternately provided with a shielding portion that shields the display image light from the two-dimensional display panel and a stripe-shaped opening portion (slit portion) that allows the display image light to pass through in the horizontal direction.

In the parallax barrier method, a parallax image for stereoscopic observation (a right-eye viewpoint image and a left-eye viewpoint image in the case of two viewpoints) is spatially divided and displayed on a two-dimensional display panel, and a parallax barrier is used. The parallax image is separated in the horizontal direction, thereby performing stereoscopic observation. By appropriately setting the slit width or the like in the parallax barrier, when the observer views the stereoscopic display device from a specific position or direction, the light of the different parallax images can be incident on the observer through the slit portion. eye.

Further, when a transmissive liquid crystal display panel is used as the two-dimensional display panel, for example, a configuration in which a parallax barrier is disposed on the back side of the two-dimensional display panel may be employed. In this case, the parallax barrier is disposed between the transmissive liquid crystal display panel and the backlight. Patent Document 1 discloses a light source device which is provided with a scattering pattern on an internal reflection surface of a light guide plate serving as a backlight, and which makes the light guide plate itself equivalent to a parallax barrier. The function.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2012-226294

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2006-196409

As described in Patent Document 1, when the light guide plate itself has a function equivalent to the parallax barrier, it is preferable that the brightness of the light emitted from the light guide plate is uniformly distributed in the plane. In Patent Document 1, the in-plane distribution of the luminance is made uniform by changing the shape of the scattering pattern depending on the position. On the other hand, for example, a wedge-shaped light guide plate is used as a backlight of a liquid crystal display device (see Patent Document 2). However, if the wedge-shaped light guide plate has a function equivalent to a parallax barrier, it may cause three-dimensional display. The quality is degraded.

Therefore, it is preferable to provide a display device and an electronic device which can realize a function equivalent to a parallax barrier using a light guide plate and can improve display quality.

A display device according to an embodiment of the present invention includes a display portion having a pixel surface and a light source device that emits light for displaying an image toward the display portion, and the light source device includes: one or more first light sources that illuminate the first illumination light And a first light guide plate having a first end surface and a second end surface facing each other, wherein a scattering surface formed by a plurality of scattering regions is provided between the first end surface and the second end surface, and the first illumination light is provided It is scattered in a plurality of scattering regions to be emitted to the outside. The first light guide plate has a shape in which the thickness changes between the first end surface and the second end surface, and the distance between the pixel surface and the scattering surface is the maximum position at which the thickness of the first light guide plate is maximized. When the converted distance is D3 and the air conversion distance at the position where the thickness of the first light guide plate is the smallest is D4, the following conditions are satisfied.

| D1-D2 |>| D3-D4 |......(1)

Wherein, it is assumed that D1: the pixel surface and the scattering surface are parallel to each other, and the thickness of the display portion is fixed, and the display portion The air conversion distance between the pixel surface and the scattering surface at the position where the thickness of the first light guide plate is the largest when air is between the first light guide plate and the first light guide plate

D2: the pixel surface and the scattering surface are parallel to each other, and the thickness of the display portion is fixed. When the display portion and the first light guide plate are air, the thickness of the first light guide plate is the smallest and the pixel surface and the scattering surface are Air conversion distance

Furthermore, an electronic device according to an embodiment of the present disclosure includes the display device according to one embodiment of the present disclosure.

In the display device or the electronic device according to the embodiment of the present disclosure, the first illumination light from the first light source is scattered by the scattering region and is emitted to the outside of the light guide plate. Thereby, the light guide plate itself can function as a parallax barrier for the first illumination light. In other words, the scattering region can be equivalently functioned as a parallax barrier of the opening (slit portion). In this way, it can cope with three-dimensional display or multi-view display.

Further, the first light guide plate has a shape in which the thickness is changed, and the air conversion distance between the pixel surface and the scattering surface satisfies a specific condition, whereby the adjustment of the in-plane luminance distribution and the case of performing three-dimensional display or multi-view display are performed. Adjustment of the observation distance becomes easy.

According to the display device or the electronic device of the embodiment of the present disclosure, since the plurality of scattering regions for scattering the first illumination light are provided on the light guide plate, the first illumination light can equivalently have the light guide plate itself as a parallax barrier. The function.

Further, since the first light guide plate has a shape in which the thickness is changed, and the air conversion distance between the pixel surface and the scattering surface satisfies a specific condition, the display quality can be improved.

1‧‧‧Display Department

2‧‧‧1st light source

3‧‧‧1st light guide

3A‧‧‧1st internal reflection surface

3B‧‧‧2nd internal reflection surface

4‧‧‧ inclined section

5‧‧‧ reflector

6‧‧‧Diffusing optical components

7‧‧‧2nd light source

8‧‧‧ spacers

10L‧‧‧ left eye

10R‧‧‧ right eye

11‧‧‧ pixel surface

11R‧‧ ‧ pixels

11G‧‧ ‧ pixels

11B‧‧ ‧ pixels

31‧‧‧scattering area

32‧‧‧ Total reflection area

50‧‧‧scattering surface

51‧‧‧1st end face

52‧‧‧2nd end face

53‧‧‧3rd end face

54‧‧‧4th end

70‧‧‧2nd light guide

71‧‧‧1st end face

72‧‧‧2nd end face

81‧‧‧reflector

82‧‧‧ND filter

83‧‧‧Brightness enhancement film

84‧‧‧ND filter

85‧‧‧Binder

86‧‧‧Binder

87‧‧‧floor

88-1‧‧‧through hole

88-2‧‧‧through hole

89‧‧‧ screws

200‧‧‧Image display screen section

210‧‧‧ front panel

220‧‧‧Filter glass

300‧‧‧Light guide plate

401‧‧‧Liquid layer

402‧‧‧Color Filters

411‧‧‧1st transparent substrate

412‧‧‧2nd transparent substrate

421‧‧‧1st polarizer

422‧‧‧2nd polarizer

D1‧‧‧ air conversion distance

D2‧‧‧ air conversion distance

D3‧‧‧Air conversion distance

D4‧‧‧ air conversion distance

D1‧‧‧air interval

D1'‧‧‧ thickness

D2‧‧‧ air gap

D2'‧‧‧ thickness

D3‧‧‧ air gap

D3'‧‧‧ thickness

D4‧‧‧ air gap

D4'‧‧‧ thickness

L‧‧‧ air conversion distance

L'‧‧‧ air conversion distance

L1‧‧‧1st illumination

L10‧‧‧2nd illumination light

L20‧‧‧Out of the light

n‧‧‧Refractive index

P1‧‧‧ position

P2‧‧‧ position

P3‧‧‧ position

T‧‧‧thickness (physical distance)

X‧‧‧ direction

Y‧‧‧ direction

Θ‧‧‧ angle

1 is a cross-sectional view in the Y direction showing a configuration example of a display device according to a first embodiment of the present disclosure.

Fig. 2 is a cross-sectional view showing the configuration of an example of a display device in the X direction.

Fig. 3 is a plan view and a cross-sectional view showing a configuration example of a light guide plate.

4 is a plan view showing an example of a pixel structure of a display unit.

Fig. 5 is a cross-sectional view showing an example of an emission state of light rays when only the first light source is turned on (lighted).

Fig. 6 is a plan view showing an example of an in-plane light-emitting pattern when the first light source is turned on (lighted).

Fig. 7 is a cross-sectional view showing an example of an emission state of light rays when only the second light source is turned on (lighted).

8 is a plan view showing an example of an in-plane light-emitting pattern when the second light source is turned on (lighted).

Fig. 9 is a cross-sectional view showing the relationship between a pixel surface and a scattering surface.

Fig. 10 is a cross-sectional view showing the Y direction of a configuration example of a display device of a comparative example.

Fig. 11 is an explanatory view showing the relationship between the thickness of the light guide plate and the shortest observation distance.

Fig. 12 is an explanatory view showing the relationship between the thickness of the light guide plate and the shortest observation distance.

Fig. 13 is a cross-sectional view showing a first modification of the display device.

Fig. 14 is a cross-sectional view showing a second modification of the display device.

Fig. 15 is a cross-sectional view showing a third modification of the display device.

Fig. 16 is a cross-sectional view showing a fourth modification of the display device.

Fig. 17 is a cross-sectional view showing a configuration example of a liquid crystal display device.

Fig. 18 is a plan view and a cross-sectional view showing a fifth modification of the display device.

Fig. 19 is a plan view and a cross-sectional view showing a sixth modification of the display device.

Figure 20 is a cross-sectional view showing a seventh modification of the display device.

Figure 21 is a cross-sectional view showing an eighth modification of the display device.

Figure 22 is a cross-sectional view showing a ninth modification of the display device.

Fig. 23 is a cross-sectional view showing a configuration example of a display device according to a second embodiment.

Fig. 24 is a cross-sectional view showing a configuration example of a display device according to a third embodiment.

Fig. 25 is a cross-sectional view showing a configuration example of a display device according to a fourth embodiment.

Fig. 26 is a cross-sectional view showing a first fixing method of the ND filter.

Fig. 27 is a cross-sectional view showing a second fixing method of the ND filter.

Figure 28 is a cross-sectional view showing a third fixing method of the ND filter.

Fig. 29 is an explanatory view showing the relationship between the transmittance of the ND filter and the brightness of the second light source.

Fig. 30 is an explanatory view showing the relationship between the light extraction pattern density of the second light source and the brightness of the second light source.

Fig. 31 is a cross-sectional view showing a first specific example of the configuration of the ND filter.

32 is a cross-sectional view showing a second specific example of the configuration of the ND filter.

Fig. 33 is a perspective view showing an example of an electronic apparatus.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Furthermore, the description is made in the following order.

1. First embodiment

[The overall composition of the display device]

[Basic Action of Display Device]

[Detailed Description of Configuration of 1st Light Guide Plate]

[effect]

[variation]

2. Second embodiment

3. Third embodiment

4. Fourth embodiment

5. Other embodiments

<1. First embodiment>

[The overall composition of the display device]

Fig. 1 and Fig. 2 show an example of the configuration of a display device according to the first embodiment of the present disclosure. The display device includes: a display unit 1 that performs image display; and a light source device that is disposed on The back side of the display unit 1 emits light for image display toward the display unit 1. The light source device includes a first light source 2, a first light guide plate 3, and a second light source 7. The first light guide plate 3 has a first internal reflection surface 3A that is disposed on the display unit 1 side and a second internal reflection surface 3B that is disposed on the second light source 7 side. Further, the first light guide plate 3 has a first end surface 51 and a second end surface 52 which face each other in the Y direction (FIG. 1). Further, the third end face 53 and the fourth end face 54 which face each other in the X direction (FIG. 2) are provided. In addition, the display device includes a control circuit and the like for the display unit 1 required for display. However, since the configuration is the same as that of a general control circuit for display, the description thereof is omitted. Moreover, although not shown, the light source device includes turning on (lighting) the first light source 2 and the second light source 7. Disconnect (non-lighting) the control circuit.

Further, in the present embodiment, the first direction (vertical direction) parallel to the plane of the display surface (pixel surface 11) of the display unit 1 is set to the Y direction (FIG. 1), and is orthogonal to the first direction. The second direction (horizontal direction) is set to the X direction (Fig. 2).

The display device can arbitrarily select to switch the two-dimensional (2D) display mode in the entire screen and the three-dimensional (3D) display mode in the entire screen. The switching between the two-dimensional display mode and the three-dimensional display mode is realized by switching control of image data displayed on the display unit 1 and switching control of turning on and off the first light source 2 and the second light source 7. Fig. 5 schematically shows an emission state of light rays from the light source device when only the first light source 2 is turned on (lighted), which corresponds to the three-dimensional display mode. An example of the in-plane light-emitting pattern of the light emitted from the first light guide plate 3 when the first light source 2 is turned on (lighted) is shown in FIG. Fig. 7 schematically shows an emission state of light rays from the light source device when only the second light source 7 is turned on (lighted), which corresponds to the two-dimensional display mode. An example of the in-plane light-emitting pattern of the light emitted from the first light guide plate 3 when the second light source 7 is turned on (lighted) is shown in FIG.

The display unit 1 is configured by using a transmissive two-dimensional display panel, for example, a transmissive liquid crystal display panel. For example, as shown in FIG. 4, the display unit 1 includes a plurality of pixels 11R and G (green) pixels 11G. And B (blue) pixels of pixel 11B, the plurality of pixels They are arranged in a matrix to form a planar pixel surface 11. The display unit 1 performs two-dimensional image display by modulating the light from the light source device with respect to the pixels according to the image data for each color. The display unit 1 arbitrarily selects and switches between displaying a plurality of viewpoint images based on the three-dimensional image data and an image based on the two-dimensional image data. Furthermore, the three-dimensional image data system includes, for example, data corresponding to a plurality of viewpoint images in a plurality of viewing angle directions in three-dimensional display. When performing, for example, a two-eye type three-dimensional display, the right eye is displayed with the information of the viewpoint image for the left eye display. In the case of displaying in the three-dimensional display mode, for example, a composite image including a plurality of stripe-shaped viewpoint images is generated and displayed in one screen.

The first light source 2 is configured by using a fluorescent lamp such as a CCFL (Cold Cathode Fluorescent Lamp) or an LED (Light Emitting Diode). The first light source 2 is irradiated with the first illumination light L1 ( FIG. 1 ) from the side surface direction toward the inside of the first light guide plate 3 . It is sufficient that at least one of the first light sources 2 is disposed on the side surface of the first light guide plate 3. In the present embodiment, a case where the first light source 2 is opposed to the first end surface 51 of the first light guide plate 3 will be described as an example. The first light source 2 is controlled to be turned on (lighted) or turned off (not lit) according to the switching between the two-dimensional display mode and the three-dimensional display mode. Specifically, the first light source 2 is controlled to be in a lighting state when the image based on the three-dimensional image data is displayed on the display unit 1 (in the case of the three-dimensional display mode), and is displayed on the display unit 1 based on the two-dimensional image. In the case of an image like a material (in the case of a two-dimensional display mode), it is controlled to a non-lighting state or a lighting state.

The second light source 7 is disposed opposite to the first light guide plate 3 on the side where the second internal reflection surface 3B is formed. The second light source 7 emits the second illumination light L10 toward the first light guide plate 3 in a direction different from that of the first light source 2 . More specifically, the second light source 7 is irradiated with the second illumination light L10 from the outside (the back side of the first light guide plate 3) toward the second internal reflection surface 3B (see FIG. 7). The second light source 7 may be a planar light source. It is conceivable to use a structure such as a light diffusing plate in which a light-emitting body such as a CCFL or an LED is incorporated, and the light emitted from the light-emitting body is diffused. Further, the second light source 7 may be a light guide type light source. The second light source 7 is based on a two-dimensional display mode and a three-dimensional display mode Switched, and controlled to be on (lighted), off (not lit). Specifically, the second light source 7 is controlled to be in a non-lighting state when the image based on the three-dimensional image data is displayed on the display unit 1 (in the case of the three-dimensional display mode), and is displayed on the display unit 1 based on the two-dimensional state. The case of the image data (in the case of the two-dimensional display mode) is controlled to the lighting state.

The first light guide plate 3 is made of, for example, a transparent plastic plate made of an acrylic resin or the like. The surface other than the second internal reflection surface 3B of the first light guide plate 3 is transparent over the entire surface. In other words, the first internal reflection surface 3A and the four end surfaces are transparent throughout the entire surface.

The first internal reflection surface 3A is mirror-finished over the entire surface, and the inside of the first light guide plate 3 is totally reflected inside the light incident at an incident angle satisfying the total reflection condition, and the light that deviates from the total reflection condition is emitted to the outside.

The second internal reflection surface 3B includes a scattering region 31 and a total reflection region 32. The scattering region 31 is formed by, for example, printing a scatterer on the surface of the first light guide plate 3, or adding light scattering characteristics by performing laser processing, sand blasting, or the like. In the second internal reflection surface 3B, when the scattering region 31 is in the three-dimensional display mode, the first illumination light L1 from the first light source 2 functions as an opening (slit portion) of the parallax barrier, and the total reflection region 32 functions as a shielding unit. In the second internal reflection surface 3B, the scattering region 31 and the total reflection region 32 are provided in a pattern that is equivalent to a structure of a parallax barrier. That is, the total reflection region 32 is provided in a pattern corresponding to the shielding portion in the parallax barrier, and the scattering region 31 is provided in a pattern corresponding to the opening portion in the parallax barrier. Further, as the barrier pattern of the parallax barrier, for example, a slit-like opening such as a vertically long slit can be used, and various types of stripes such as a pattern in which the shielding portion is arranged side by side in the horizontal direction can be used, and Limited to a specific person. FIG. 6 shows the outgoing light from the first light guide plate 3 (the outgoing light L20 from the first light source 2) when a plurality of scattering regions 31 extending in the longitudinal direction as shown in FIG. 3 are arranged side by side in a stripe shape. An example of the in-plane light-emitting pattern of Fig. 5)). As shown in FIG. 3, the scattering region 31 is provided in a specific region between the first end surface 51 and the second end surface 52 of the first light guiding plate 3, and is provided in plural, for example, in a fixed density and a fixed shape. Thereby, a plurality of scattering regions 31 A scattering surface 50 is formed.

The total internal reflection area 3A of the first internal reflection surface 3A and the second internal reflection surface 3B makes total internal reflection of the light incident at an incident angle satisfying the total reflection condition (to make the inside of the light incident at an incident angle larger than a specific critical angle reflection). Thereby, the first illumination light L1 from the first light source 2 incident at the incident angle of the total reflection condition is used between the first internal reflection surface 3A and the total internal reflection surface 3B of the second internal reflection surface 3B. The reflection guides light to the side. Further, as shown in FIG. 7, the total reflection area 32 penetrates the second illumination light L10 from the second light source 7, and emits light as a deviation from the total reflection condition toward the first internal reflection surface 3A.

As shown in FIGS. 1 and 5, the scattering region 31 scatters and reflects the first illumination light L1 from the first light source 2, and emits light that deviates from the total reflection condition for at least a part of the light of the first illumination light L1. The light ray L20 is emitted toward the first internal reflection surface 3A.

As shown in FIG. 1 to FIG. 3, the first light guide plate 3 has a wedge-shaped shape in which the thickness changes between the first end surface 51 and the second end surface 52 in the light guiding direction. The thickness in the cross section between the third end face 53 and the fourth end face 54 is constant. Further, the first light guide plate 3 is disposed to be inclined such that the air-converted distance between the pixel surface 11 and the scattering surface 50 satisfies a specific condition. Details of the arrangement or specific conditions of the first light guide plate 3 will be described below.

[Basic Action of Display Device]

In the display device, when displaying in the three-dimensional display mode, image display based on three-dimensional image data is performed on the display unit 1, and the first light source 2 and the second light source 7 are turned on (lighted). . The off (non-lighting) control is for three-dimensional display. Specifically, as shown in FIG. 5, the first light source 2 is turned on (lighted), and the second light source 7 is controlled to be turned off (non-lighted). In this state, the first illumination light L1 from the first light source 2 is internally totally reflected between the first internal reflection surface 3A and the total reflection area 32 of the second internal reflection surface 3B in the first light guide plate 3, Thereby, the side surface from the side on which the first light source 2 is disposed is guided to the other side surface of the opposite direction. On the other hand, a part of the first illumination light L1 from the first light source 2 is scattered and reflected by the scattering region 31 of the first light guide plate 3, and penetrates the first inner portion of the first light guide plate 3. The reflection surface 3A is emitted to the outside of the first light guide plate 3. In this case, the in-plane light emission pattern of the emitted light from the first light guide plate 3 (the outgoing light L20 (FIG. 5) from the first light source 2) is as shown in FIG. 6, for example. Thereby, the light guide plate itself can function as a parallax barrier. In other words, the first illumination light L1 from the first light source 2 can be equivalently functioned as a parallax barrier in which the scattering region 31 is an opening (slit portion) and the total reflection region 32 is a shielding portion. Thereby, the three-dimensional display of the parallax barrier method in which the parallax barrier is disposed on the back side of the display unit 1 can be equivalently performed.

On the other hand, when displaying in the two-dimensional display mode, image display based on two-dimensional image data is performed on the display unit 1, and the first light source 2 and the second light source 7 are turned on (lighted). . The off (non-lighting) control is for two-dimensional display. Specifically, for example, as shown in FIG. 7 , the first light source 2 is turned off (not lit), and the second light source 7 is controlled to be turned on (lighted). In this case, the second illumination light L10 from the second light source 7 passes through the total reflection region 32 in the second internal reflection surface 3B, and becomes a deviation from the total reflection condition from substantially the entire surface of the first internal reflection surface 3A. The light is emitted to the outside of the first light guide plate 3. In this case, the in-plane light emission pattern from the light emitted from the first light guide plate 3 (the light emitted from the second light source 7) is, for example, as shown in FIG. That is, the first light guide plate 3 functions as a planar light source similar to a normal backlight. Thereby, a two-dimensional display in which a backlight of a normal backlight is disposed on the back side of the display unit 1 is equivalently performed.

In addition, even if only the second light source 7 is turned on, the second illumination light L10 is emitted from substantially the entire surface of the first light guide plate 3. However, the first light source 2 may be turned on as needed. Thereby, for example, when only the second light source 7 is turned on and the luminance distribution corresponding to the portion of the scattering region 31 and the total reflection region 32 is poor, the adjustment is made by appropriate adjustment (on-off control, or point). The adjustment of the amount of light) The lighting state of the first light source 2 optimizes the brightness distribution over the entire surface. However, when the two-dimensional display is performed, for example, when the brightness is corrected sufficiently on the display unit 1 side, only the second light source 7 can be turned on.

[Detailed Description of Arrangement of First Light Guide Plate 3]

When the first light guide plate 3 is formed in a wedge shape, the thickness of the first light guide plate 3 changes in the plane. Therefore, the air conversion distance from the scattering surface 50 of the first light guide plate 3 to the pixel surface 11 of the display unit 1 changes. Thereby, the shortest observation distance in the case of performing three-dimensional display changes in the plane, and adversely affects the image quality of the three-dimensional display. Before describing the arrangement of the first light guide plate 3, first, the relationship between the air conversion distance and the shortest observation distance will be described.

For example, as shown in FIG. 11, the shortest viewing distance in the case of the light guide plate 300 having a constant thickness is proportional to the air conversion distance L from the self-scattering surface 50 to the pixel surface 11. The air conversion distance L' in the case of the configuration of Fig. 11 is a value (t/n) obtained by dividing the thickness (physical distance) t of the light guide plate 300 by the refractive index n of the light guide plate 300. In addition, FIG. 11 shows an example in which a viewpoint image of six viewpoints is displayed on the pixel surface 11, and the third viewpoint image reaches the left eye 10L, and the fourth viewpoint image reaches the right eye 10R to perform stereoscopic Observed. In this way, the shortest distance L which is a state in which the left eye 10L and the right eye 10R are incident on the different different viewpoint images in the entire area of the screen is set as the "shortest observation distance". As shown in FIG. 11, if the thickness of the light guide plate 300 is fixed in the plane regardless of the position, the shortest observation distance is fixed in the plane regardless of the position.

On the other hand, the constitution of the comparative example of FIG. 10 was examined. In the configuration of this comparative example, the first light guide plate 3 has a wedge shape. The pixel surface 11 of the display unit 1 and the scattering surface 50 of the first light guide plate 3 are parallel to each other, and the thickness of the display unit 1 is fixed. Further, air is present between the display unit 1 and the first light guide plate 3. In this case, the air conversion distance D1 between the pixel surface 11 and the scattering surface 50 at the position where the thickness of the first light guide plate 3 is the largest is D1≒d1+d1'/n. D1 is an air gap between the display unit 1 and the first light guide plate 3 at the position where the thickness of the first light guide plate 3 is the largest, d1' is the thickness of the first light guide plate 3, and n is the refractive index of the first light guide plate 3. rate. In addition, the thickness from the pixel surface 11 to the surface of the display part 1 is set to be sufficiently small and is omitted.

Moreover, the pixel surface 11 and the scattering surface 50 at the position where the thickness of the first light guiding plate 3 is the smallest The air conversion distance D2 between the two becomes D2≒d2+d2'/n.

D2 is an air gap between the display portion 1 and the first light guide plate 3 at a position where the thickness of the first light guide plate 3 is the smallest, d2' is the thickness of the first light guide plate 3, and n is the refractive index of the first light guide plate 3. rate. In addition, the thickness from the pixel surface 11 to the surface of the display part 1 is set to be sufficiently small and is omitted.

In the case of the configuration of the comparative example of FIG. 10, since the pixel surface 11 of the display unit 1 and the scattering surface 50 of the first light guide plate 3 are parallel to each other, the physical distance is fixed in the plane, but the air conversion distance differs depending on the position. Therefore, as shown in FIG. 12, the shortest observation distance changes depending on the position in the screen. Specifically, the shortest viewing distance at the position where the thickness of the first light guiding plate 3 is relatively small is farther than the shortest viewing distance at the position where the thickness is relatively large. In such a situation, there is a problem that the crosstalk is deteriorated in one part of the screen, and cannot be seen in three dimensions without normal stereoscopic observation.

In the present embodiment, as shown in FIG. 9, the air-converting distance at the position where the thickness of the first light guide plate 3 is the largest is D3, and the first light guide plate 3 is used. When the air conversion distance at the position where the thickness is the smallest is set to D4, the following conditions are satisfied.

| D1-D2 |>| D3-D4 |......(1)

Specifically, in order to satisfy the conditional expression (1), the first light guide plate 3 is inclined by an angle θ (the scattering surface 50 is inclined by an angle θ with respect to the pixel surface 11 as compared with the configuration of the comparative example of FIG. 10, and thus the pixel The face 11 and the scattering face 50 are not parallel to each other). Further, it is preferable that the air-converted distance D3 is inclined so as to be the same as the air-converted distance D4. Thereby, the air conversion distance between the pixel surface 11 and the scattering surface 50 between the first end surface 51 and the second end surface 52 is fixed regardless of the position, and the shortest observation distance L is also fixed in the plane regardless of the position.

Furthermore, in the case of the configuration of Fig. 9, the air conversion distance D3 is expressed as follows Show.

D3≒d3+d3'/n

D3 is an air gap between the display portion 1 and the first light guide plate 3 at the position where the thickness of the first light guide plate 3 is the largest, d3' is the thickness of the first light guide plate 3, and n is the refractive index of the first light guide plate 3. rate. In addition, the thickness from the pixel surface 11 to the surface of the display part 1 is set to be sufficiently small and is omitted.

Further, the air conversion distance D4 is expressed as follows.

D4≒d4+d4'/n

D4 is an air gap between the display unit 1 and the first light guide plate 3 at a position where the thickness of the first light guide plate 3 is the smallest, d4' is the thickness of the first light guide plate 3, and n is the refractive index of the first light guide plate 3. rate. In addition, the thickness from the pixel surface 11 to the surface of the display part 1 is set to be sufficiently small and is omitted.

[effect]

As described above, according to the present embodiment, since the air conversion distance between the pixel surface 11 and the scattering surface 50 satisfies a specific condition, even if the structure of the first light guide plate 3 is a wedge-shaped shape having a thickness change, the minimum reduction can be minimized. Observe the change in distance and seek to improve the display quality. Moreover, by setting the first light guide plate 3 in a wedge shape, it is easy to achieve uniformization of the luminance distribution in the surface of the light emitted from the first light guide plate 3.

(Specific improvement example)

The results of measurement of the shortest observation distance in the configuration of the present embodiment (Fig. 9) and the configuration of the comparative example (Fig. 10) are shown. As a configuration of the present embodiment, the air conversion distance between the pixel surface 11 and the scattering surface 50 is fixed regardless of the position. The shortest viewing distance at the position P1 at the upper portion of the screen, the position P2 at the center, and the position P3 at the lower portion (see Fig. 3) was measured as follows.

. The composition of the comparative example

P1:1400mm

P2: 1250mm

P3: 1070mm

. The situation of the constitution of this embodiment

P1:1090mm

P2: 1080mm

P3: 1060mm

According to the above measurement results, in the case of the configuration of the present embodiment, the change in the shortest observation distance is reduced.

[variation]

Fig. 13 shows a first variation. In the first modification, an optical member (spacer 8) is disposed between the pixel surface 11 and the first light guide plate 3, and the optical member (the spacer 8) has a thickness distribution with the first light guide plate 3. The thickness is varied in a manner that varies in thickness. In the configuration example of FIG. 9, the first light guide plate 3 is disposed at an inclination angle θ (the pixel surface 11 and the scattering surface 50 are not parallel to each other), but in the configuration example of FIG. 13, the first light guide plate 3 is not inclined. (The pixel surface 11 and the scattering surface 50 are parallel to each other). However, the above conditional expression (1) is satisfied by the arrangement of the spacers 8. The spacer 8 is disposed between the surface of the display unit 1 facing the first light guide plate 3 and the surface of the first light guide plate 3 facing the display unit 1 . The spacer 8 may be bonded to the surface of the display unit 1 facing the side of the first light guide plate 3. The thickness distribution of the spacer 8 is preferably changed in such a manner that the thickness becomes the smallest at the position where the thickness of the first light guide plate 3 is the largest, and the thickness becomes the largest at the position where the thickness of the first light guide plate 3 is the smallest.

Fig. 14 shows a second modification. In the configuration example of FIG. 9, the first light source 2 and the first light guide plate 3 are also inclined by an angle θ. On the other hand, as in the second modification of FIG. 14, the first light source 2 may not be inclined.

Fig. 15 shows a third modification. In the configuration example of FIG. 9, the pixel surface 11 and the scattering surface 50 are not parallel to each other by the arrangement of the inclination angle θ of the first light guide plate 3. However, in the configuration example of FIG. 15, the display is inclined. The portion 1 is different from the arrangement of the first light guide plate 3.

Fig. 16 shows a fourth modification. In the fourth modification, an optical member is disposed between the pixel surface 11 and a surface of the display unit 1 facing the first light guide plate 3, and the optical member has the same function as the first light guide plate 3. The thickness distribution of the thickness distribution varies in thickness. In the configuration example of FIG. 9, the first light guide plate 3 is disposed at an inclination angle θ (the pixel surface 11 and the scattering surface 50 are not parallel to each other), but in the configuration example of FIG. 16, the first light guide plate 3 is not inclined. (The pixel surface 11 and the scattering surface 50 are parallel to each other). However, the conditional expression (1) is satisfied by setting the display unit 1 to a structure in which the thickness is changed.

For example, the display unit 1 can be constituted by a liquid crystal display device as shown in FIG. The liquid crystal display device has a liquid crystal layer 401 and a color filter 402 at the center. Further, the liquid crystal layer 401 and the color filter 402 are sandwiched between the first transparent substrate 411 and the second transparent substrate 412. Further, the first polarizing plate 421 and the second polarizing plate 422 are disposed on the outermost side.

In the case of the liquid crystal display device shown in FIG. 17, at least one of the first transparent substrate 411 and the first polarizing plate 421 can be used as an optical member whose thickness is changed. Further, members other than the first transparent substrate 411 and the first polarizing plate 421 may be bonded together as an optical member whose thickness is changed.

Fig. 18 shows a fifth modification. Although one first light source 2 is provided in the configuration examples of FIGS. 1 to 3, two first light sources 2 may be provided as shown in FIG. In other words, one of the two first light sources 2 may be disposed to face the first end surface 51 and the other one of the first light sources 2 may be disposed on the second end surface 52.

Fig. 19 shows a sixth modification. In the configuration example described above, the configuration example in which the first light source 2 is disposed in the vertical direction (Y direction) of the first light guide plate 3 has been described. However, the first light source 2 may be disposed in the left-right direction (X direction). Light source 2. Fig. 19 shows an example of the configuration of such a display device. In the configuration example of FIG. 19, the first light source 2 is disposed to face the third end surface 53 in the opposing direction. In the configuration of FIG. 19, the first light guide plate 3 has a wedge-shaped shape in which the thickness between the third end surface 53 and the fourth end surface 54 changes. In the case of such a configuration, the air-converted distance between the pixel surface 11 and the scattering surface 50 may be such that the conditional expression (1) is satisfied between the third end surface 53 and the fourth end surface 54. For example, the first light guide plate 3 may be disposed obliquely in the cross section in the X direction.

Fig. 20 shows a seventh modification. In the configuration example of FIG. 20, between the end surface (the first end surface 51) on the side where the first light source 2 is disposed, and the scattering surface 50 in the first light guide plate 3 are provided to be used from the first light source 2 The first illumination light L1 travels to the inclined portion 4 of the scattering surface 50. Further, the end surface (second end surface 52) on the side where the first light source 2 is not disposed is provided with a reflector 5 for causing the first illumination light L1 reaching the second end surface 52 to travel to the scattering surface 50.

The inclined portion 4 and the reflector 5 are provided to change the angular distribution of the first illumination light L1 propagating inside the first light guide plate 3, thereby improving the unevenness of the amount of light incident on the scattering region 31. For example, a plurality of scattering regions 31 are provided between the first end surface 51 and the second end surface 52 of the first light guiding plate 3 so as to be fixed to each other in a density and a fixed shape. In this case, the brightness of the portion closer to the first light source 2 in the first light guide plate 3 becomes higher, and the brightness at the end portion closer to the opposite side to the first light source 2 becomes lower. This is improved by providing the inclined portion 4 and the reflector 5.

The reflector 5 is attached to or disposed close to the second end surface 52, for example. The second end surface 52 and the reflector 5 are preferably inclined. By inclining the second end surface 52 and the reflector 5, the angular distribution direction of the light reaching the second end surface 52 can be changed by the inclined reflection surface of the reflector 5. By changing the angle distribution direction of the light reaching the second end surface 52 in this way, the probability of light entering the scattering region 31 can be improved. Thereby, there is an effect of increasing the brightness in the vicinity of the end portion on the opposite side to the first light source 2.

Fig. 21 shows an eighth modification. In the configuration example described above, the surface (the first internal reflection surface 3A) on the side opposite to the side on which the scattering surface 50 is provided in the first light guide plate 3 is a flat surface (the cross-sectional shape is linear). Although it has been described, it may be a curved surface as shown in Fig. 21 (the cross-sectional shape is a curved shape).

Fig. 22 shows a ninth modification. In the configuration example of FIG. 1 to FIG. 3, the first light source 2 is disposed opposite to the side of the first light guide plate 3 having a larger thickness (the first end surface 51), but the first light source 2 may be the first as shown in FIG. The light source 2 is disposed opposite to the side (the second end surface 52) having a small thickness.

<2. Second embodiment>

Next, a display device according to the second embodiment will be described. The components that are substantially the same as those of the display device of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

Fig. 23 shows an example of the configuration of a display device according to the second embodiment. The display device further includes a diffusing optical member 6 with respect to the display device of FIG. The diffusing optical member 6 is disposed between the first light guide plate 3 and the second light source 7 .

The first light guide plate 3 for three-dimensional display emits light to the display unit 1 side by using, for example, a scattering reflection pattern, and thus expands in a state close to Lambert scattering. On the other hand, the second light source 7 which is a backlight for two-dimensional display is equal to the light emitted from the first light guide plate 3, for example, since the second light source 7 is equal to the light emitted from the first light guide plate 3, for example, the light source emitted from the first light guide plate 3 is used. 7 The light distribution of the light is narrower. When the light distribution of the first light guide plate 3 for three-dimensional display is different from the light distribution of the second light source 7 for two-dimensional display as described above, the first light guide plate 3 (first light source 2) is caused during two-dimensional display. When both of the second light sources 7 emit light or when two-dimensional display and three-dimensional display are switched, there is a case where the difference in light distribution is recognized, and the user feels abnormal.

Therefore, the above problem can be solved by making the light distribution of the second light source 7 the same as or close to the same as the first light guide plate 3 for three-dimensional display. The light distribution of the second light source 7 which is a backlight for two-dimensional display is enlarged, and is close to the light distribution of the first light guide plate 3 for three-dimensional display. Therefore, specifically, an optical member such as a diffusion plate, a diffusion sheet, and a cymbal having an effect of expanding the light distribution is disposed as the diffusion optical member 6 between the first light guide plate 3 and the second light source 7 as shown in FIG. 23 . In order to solve the above problems. Alternatively, the above problem can be solved by using a scattering reflection pattern similar to the scattering reflection pattern used in the first light guiding plate 3 for a backlight for two-dimensional display.

<3. Third embodiment>

Next, a display device according to a third embodiment of the present disclosure will be described. The components that are substantially the same as those of the display device according to the first or second embodiment are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

Fig. 24 is a view showing an example of the configuration of a display device according to a third embodiment. In the display device of the present embodiment, a light guide type light source is disposed on the opposite side of the display unit 1 from the first light guide plate 3 with respect to the configuration example shown in FIG. 1 to FIG. In other words, the second light source 7 and the second light guide plate 70 that emits the second illumination light from the second light source 7 toward the display unit 1 side are included. Further, between the first light guide plate 3 and the second light guide plate 70, an ND (Neutral Density) filter 82 and a brightness enhancement sheet 83 are disposed. The ND filter 82 is for absorbing unnecessary light leakage from the first light guide plate 3. The brightness enhancement sheet 83 is for increasing the brightness of the light emitted from the second light guide plate 70. A reflection sheet 81 for illuminating the light leakage from the second light guide plate 70 toward the second light guide plate 70 is disposed opposite to the surface (bottom surface) of the second light guide plate 70 opposite to the first light guide plate 3 .

The second light guide plate 70 has a first end surface 71 and a second end surface 72 that face each other. The second light source 7 is disposed opposite to the second end surface 72. The second light guide plate 70 has a wedge shape and is disposed to have a thickness distribution different from the thickness distribution of the first light guide plate 3 between the first end surface 71 and the second end surface 72. Specifically, the second light guide plate 70 has a thickness distribution in which the thickness of the first light guide plate 3 is the smallest, and the thickness becomes the smallest at the position where the thickness of the first light guide plate 3 is the smallest. maximum. Further, the wedge-shaped second light guide plate 70 is disposed to face the first light guide plate 3 with the slanting surface facing each other.

Since the entire first light guide plate 3 is disposed obliquely as described in the first embodiment, the second light guide plate 70 is disposed as described above, whereby the entire display device can be made thinner. Moreover, by using the wedge-shaped second light guide plate 70, the light use efficiency at the time of two-dimensional display can be improved. Thereby, the power consumption in the two-dimensional display can be reduced.

<4. Fourth embodiment>

Next, a display device according to a fourth embodiment of the present disclosure will be described. The components that are substantially the same as those of the display devices of the above-described first to third embodiments are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.

Fig. 25 is a view showing an example of the configuration of a display device according to a fourth embodiment. Relative to Figure 1 above In the display device of the present embodiment, in the display device of the present embodiment, ND is disposed on the opposite side of the display unit 1 from the first light guide plate 3 (between the first light guide plate 3 and the second light source 7). (Neutral Density) filter 84. The ND filter 84 is for absorbing the unnecessary light leakage from the first light guide plate 3. The ND filter 84 can be used for shape processing, for example, on a commercially available colored transparent acrylic sheet. The colored transparent acrylic sheet desirably has a uniform absorption wavelength. The ND filter 84 has a wedge shape and is disposed to have a thickness distribution different from the thickness distribution of the first light guide plate 3. Specifically, the ND filter 84 has a thickness distribution in which the thickness becomes the smallest at the position where the thickness of the first light guide plate 3 is the largest, and the thickness becomes the position where the thickness of the first light guide plate 3 is the smallest. maximum. Further, the wedge-shaped ND filter 84 is placed facing the first light guide plate 3 with the slanting surface facing it. Since the entire first light guide plate 3 is disposed obliquely as described in the first embodiment, the ND filter 84 is placed facing the first light guide plate 3 so as to face the inclination thereof.

FIG. 26 shows a first example of a method of fixing the ND filter 84. In the first example, the inclined surface side of the ND filter 84 and the first light guide plate 3 are locally joined by using, for example, an adhesive 85 for an acrylic plate. Since the joint portion is also optically joined, light leaks from the first light guide plate 3, but since the leaked light is absorbed by the ND filter 84, it does not greatly affect the light. As the adhesive 85, a commercially available UV (Ultraviolet) curing type adhesive for optical parts can be used. Further, as the bonding method, a commercially available optical transparent adhesive sheet or ultrasonic bonding may be used without using an adhesive, and the joining method is not limited. The joint portion may be the outer side of the scattering surface 50 in the first light guide plate 3 (corresponding to the portion on the outer side of the pixel surface 11 of the display unit 1). Further, the surface of the ND filter 84 opposite to the inclined surface and the second light source 7 may be locally joined by the same method. For example, bonding may be performed using an adhesive 86 for an acrylic sheet, an adhesive sheet, or the like.

FIG. 27 shows a second example of the method of fixing the ND filter 84. In the second example, the display device includes a bottom plate 87. An ND filter 84 is fixed to the bottom plate 87. The bottom plate 87 is formed to have a shape covering the bottom surface side of the second light source 7 to the bottom end portion of the ND filter 84. By For example, the adhesive sheet 86 is bonded by an adhesive 86 or an adhesive sheet, and the ND filter 84 is fixed to the bottom plate 87. Further, the inclined surface side of the ND filter 84 and the first light guide plate 3 are locally joined by, for example, the adhesive 85 in the same manner as the first example of FIG. In the same manner as in the above-described first example, a commercially available optical transparent adhesive sheet or ultrasonic bonding may be used without using an adhesive, and the joining method is not limited.

FIG. 28 shows a third example of the method of fixing the ND filter 84. In the third example, the display device includes the bottom plate 87 in the same manner as the second example described above. An ND filter 84 is mechanically fixed to the bottom plate 87. Specifically, a through hole 88-1 is provided at an end portion of the ND filter 84, and a through hole 88-2 is provided at an end portion of the bottom plate 87, and a screw is used through the through holes 88-1 and 88-2. 89 mechanically fixes the bottom plate 87 and the ND filter 84. Further, the inclined surface side of the ND filter 84 and the first light guide plate 3 are locally joined by, for example, the adhesive 85 in the same manner as the first example of FIG.

FIG. 29 shows the relationship between the transmittance of the ND filter 84 and the brightness of the second light source 7. When the ND filter 84 is wedge-shaped, as shown in FIG. 29, the transmittance changes depending on the position. Since the second light source 7 for two-dimensional display is generally designed to have a uniform brightness distribution over the entire surface, the difference in position of the transmittance of the ND filter 84 is caused by the difference in position during the two-dimensional display. The brightness distribution is poor. Therefore, it is preferable to adjust the luminance distribution of the second light source 7 so as to cancel the change in the transmittance of the ND filter 84. That is, as shown in FIG. 29, the brightness is relatively increased at a position where the transmittance of the ND filter 84 is relatively low, and the brightness is relatively lowered at a position where the transmittance is relatively high, thereby improving the filtering by ND. The unevenness of the brightness distribution in the plane behind the sheet 84.

As a method of adjusting the brightness of the second light source 7, for example, a light source substrate (not shown) is disposed on a portion corresponding to a side where the thickness of the ND filter 84 is smaller and a portion corresponding to a side having a larger thickness, and A method of adjusting the driving current of the light source substrates, and the like. Alternatively, when the second light source 7 is used as a light guide type light source, as shown in FIG. 30, it is also possible to cope with a change in the light extraction pattern density of the light guide type light source. In the usual light guide type Among the light sources, the brightness of the pattern density is higher. Therefore, the pattern density is relatively increased at a position where the transmittance of the ND filter 84 is relatively low, and the pattern density is relatively lowered at a position where the transmittance is relatively high, whereby the pass of the ND filter 84 can be improved. The unevenness of the brightness distribution in the plane.

FIG. 31 shows a first specific example of the configuration of the ND filter 84. The commercially available colored acrylic used as the ND filter 84 can determine the specification of the absorbance per unit length and is appropriately selected. As in the first specific example of Fig. 31, in the case where, for example, a color acryl having an absorbance of 10%/mm per unit length is 5 mm in a portion having a small thickness and a portion having a large thickness of 6 mm is used as an ND filter. In the case of the sheet 84, the portion having a smaller thickness has a transmittance of 50%, and the portion having a larger thickness has a transmittance of 40%. The luminance distribution of the light from the second light source 7 is deteriorated due to the difference in the transmittance. However, if 10% of the luminance distribution is tolerated, there is no problem in use.

When the brightness distribution of 10% cannot be tolerated, for example, as in the second specific example of Fig. 32, the absorption rate is 5%/mm, the portion having a small thickness is 10 mm, and the portion having a large thickness is 11 mm. . In this case, the transmittance of the portion having the smaller thickness is 50%, and the transmittance of the portion having the larger thickness is 45%, so that the difference in the luminance distribution of the light from the second light source 7 can be reduced. When the maximum transmittance of the ND filter 84 is set to 50% or less, the influence on the luminance distribution of the light from the second light source 7 can be reduced by changing the thickness of the material and the wedge shape. . In actual use, the difference between the transmittance of the material used by the ND filter 84 and the shape of the wedge shape is, for example, 20% or less, and is not limited to a specific configuration.

<5. Other Embodiments>

The technology disclosed in the present invention is not limited to the description of the above embodiments, and various modifications can be made.

For example, any of the display devices of the above embodiments can be applied to various electronic devices having a display function. Figure 33 shows the appearance of a television device as such an electronic device. An example of a machine. The television device includes a video display screen unit 200 including a front panel 210 and a filter glass 220.

Further, in each of the above-described embodiments, the configuration in which the scattering region 31 and the total reflection region 32 are provided on the second internal reflection surface 3B side in the first light guide plate 3 has been described. 1 The structure of the internal reflection surface 3A side.

Further, in each of the above-described embodiments, the case where the first illumination light L1 from the first light source 2 is used for three-dimensional display is taken as an example, but instead of three-dimensional display, an image different in accordance with the observation direction may be displayed. The so-called multi-view display.

Further, for example, the present technology can adopt the following configuration.

(1)

A display device including: a display unit having a pixel surface; and a light source device that emits light for image display toward the display unit; and the light source device includes: one or more first light sources, and the first light source is irradiated Illuminating light; and a first light guiding plate having a first end surface and a second end surface facing each other, wherein a scattering surface formed by a plurality of scattering regions is provided between the first end surface and the second end surface, The first illumination light is scattered and emitted to the outside in the plurality of scattering regions, and the first light guide plate has a shape in which a thickness changes between the first end surface and the second end surface; The distance from the scattering surface is set to D3 at a position at which the thickness of the first light guide plate is maximized, and the air conversion distance at a position where the thickness of the first light guide plate is the smallest is set to When D4, the following conditions are satisfied.

| D1-D2 |>| D3-D4 |......(1)

Wherein, it is assumed that D1: the pixel surface and the scattering surface are parallel to each other, and the thickness of the display portion is The air conversion distance between the pixel surface and the scattering surface at the position where the thickness of the first light guide plate is the largest when the display portion and the first light guide plate are air

D2: the pixel surface and the scattering surface are parallel to each other, and the thickness of the display portion is fixed, and when the display portion and the first light guide plate are air, the thickness of the first light guide plate is the smallest. The air conversion distance between the pixel surface and the scattering surface.

(2)

The display device according to (1) above, wherein the air conversion distance between the pixel surface and the scattering surface is fixed regardless of the position.

(3)

The display device according to the above (1) or (2), wherein the scattering surface and the pixel surface are not parallel to each other between the first end surface and the second end surface.

(4)

The display device according to the above aspect (1) or (2), wherein an optical member is disposed between the pixel surface and the first light guide plate, and the optical member has a thickness distribution different from a thickness distribution of the first light guide plate The way to make the thickness change.

(5)

The display device according to the above (4), wherein the thickness distribution of the optical member is changed such that the thickness of the first light guide plate is the smallest at the position where the thickness of the first light guide plate is the largest, and the thickness of the first light guide plate is The thickness becomes maximum at the smallest position.

(6)

The display device according to the above aspect (4) or (5), wherein a surface of the display portion facing the first light guide plate and a side of the first light guide plate facing the display portion are opposite to each other The above optical member is disposed between.

(7)

The display device according to the above (4) or (5), wherein the optical member is disposed between the pixel surface and a surface of the display portion facing the side of the first light guide plate.

(8)

The display device according to any one of the above aspects, further comprising: a second light source and a second light guide plate disposed opposite to the display unit with respect to the first light guide plate; and the second guide The light plate has a thickness distribution in which the thickness is minimized at a position where the thickness of the first light guide plate is the largest, and the thickness is maximized at a position where the thickness of the first light guide plate is the smallest.

(9)

The display device according to any one of the above (1) to (7), wherein the ND filter is disposed on the opposite side of the display portion with respect to the first light guide plate.

(10)

In the display device according to the above (9), the ND filter has a structure in which the thickness is changed so as to have a thickness distribution different from the thickness distribution of the first light guide plate.

(11)

The display device according to the above (10), wherein the thickness distribution of the ND filter is changed in such a manner that the thickness of the first light guide plate is the smallest at the position where the thickness of the first light guide plate is the largest, and the first light guide plate is Thickness The thickness becomes maximum at the smallest position.

(12)

The display device according to any one of the above (9), wherein the ND filter is partially joined to the first light guide plate.

(13)

The display device according to the above (12), wherein the first light guide plate further includes a second light source that illuminates the second illumination light on the side opposite to the display portion; and the first light guide plate and the second light source The ND filter is disposed between the second light source and the ND filter.

(14)

The display device according to (12) above, further comprising a bottom plate; and the ND filter is fixed to the bottom plate.

(15)

The display device according to any one of the above (1) to (14), wherein the first light source is disposed opposite to at least one of the first end surface and the second end surface.

(16)

The display device according to the above aspect (15), wherein an inclined portion is provided between an end surface of the first end surface and the second end surface facing the first light source and the plurality of scattering regions, and the inclined portion is provided The first illumination light is caused to travel to the plurality of scattering regions.

(17)

The display device according to any one of the above (1), further comprising a second light source that is disposed on the first light guide plate The display unit is on the opposite side and illuminates the second illumination light.

(18)

The display device according to (17) above, wherein the display unit selectively switches between displaying a plurality of viewpoint images based on the three-dimensional image data and an image based on the two-dimensional image data; wherein the second light source is displayed on the display When the plurality of viewpoint images are displayed, the portion is controlled to be in a non-lighting state, and is controlled to be in a lighting state when the image based on the two-dimensional image data is displayed on the display portion.

(19)

The display device according to (18), wherein the first light source is controlled to be in a lighting state when the plurality of viewpoint images are displayed on the display unit, and the two-dimensional image data is displayed on the display unit. In the case of an image, it is controlled to a non-lighting state or a lighting state.

(20)

An electronic device comprising: a display device comprising: a display portion having a pixel surface; and a light source device that emits light for image display toward the display portion; and the light source device includes: one or more a light source that illuminates the first illumination light; and a first light guide plate having a first end surface and a second end surface that face each other, and a plurality of scattering regions are formed between the first end surface and the second end surface The scattering surface is emitted to the outside by scattering the first illumination light in the plurality of scattering regions, and the first light guide plate is changed in thickness between the first end surface and the second end surface. a shape; the first light guide plate is disposed on a distance between the pixel surface and the scattering surface When the air conversion distance at the position where the thickness is the largest is D3, and the air conversion distance at the position where the thickness of the first light guide plate is the smallest is D4, the following conditions are satisfied.

| D1-D2 |>| D3-D4 |......(1)

Among them, set to D1: the pixel surface and the scattering surface are parallel to each other, and the thickness of the display portion is fixed, and when the display portion and the first light guide plate are air, the thickness of the first light guide plate is at a maximum position. Air conversion distance between the pixel surface and the scattering surface

D2: the pixel surface and the scattering surface are parallel to each other, and the thickness of the display portion is fixed, and when the display portion and the first light guide plate are air, the thickness of the first light guide plate is the smallest. The air conversion distance between the pixel surface and the scattering surface.

The present application claims priority on the basis of Japanese Patent Application No. 2013-8194, filed on Jan. 27, 2013, the entire entire entire entire entire entire entire content

If it is a person skilled in the art, various modifications, combinations, sub-combinations, and alterations may be made according to the design requirements or other reasons, but it should be understood that they are included in the scope of the accompanying patent application or its equivalent. Within the scope.

1‧‧‧Display Department

2‧‧‧1st light source

3‧‧‧1st light guide

3A‧‧‧1st internal reflection surface

3B‧‧‧2nd internal reflection surface

7‧‧‧2nd light source

11‧‧‧ pixel surface

31‧‧‧scattering area

50‧‧‧scattering surface

51‧‧‧1st end face

52‧‧‧2nd end face

L1‧‧‧1st illumination

Y‧‧‧ direction

Claims (20)

A display device including: a display unit having a pixel surface; and a light source device that emits light for image display toward the display unit; and the light source device includes: one or more first light sources, and the first light source is irradiated Illuminating light; and a first light guiding plate having a first end surface and a second end surface facing each other, wherein a scattering surface formed by a plurality of scattering regions is provided between the first end surface and the second end surface, The first illumination light is scattered and emitted to the outside in the plurality of scattering regions, and the first light guide plate has a shape in which a thickness changes between the first end surface and the second end surface; The distance from the scattering surface is set to D3 at a position at which the thickness of the first light guide plate is maximized, and the air conversion distance at a position where the thickness of the first light guide plate is the smallest is set to In the case of D4, the following conditions are satisfied: | D1-D2 |>| D3-D4 | (1) where D1 is set: the pixel surface is parallel to the scattering surface, and the thickness of the display portion is fixed. The display unit and the first light guide The air-converted distance D2 between the pixel surface and the scattering surface at the position where the thickness of the first light guide plate is the maximum between the plates is air: the pixel surface and the scattering surface are parallel to each other, and the display is The thickness of the portion is fixed, and the pixel surface and the scattering surface at a position where the thickness of the first light guide plate is the smallest when the display portion and the first light guide plate are air The distance between the air conversion. The display device of claim 1, wherein the air conversion distance between the pixel surface and the scattering surface is fixed regardless of the position. The display device according to claim 1, wherein the scattering surface and the pixel surface are not parallel to each other between the first end surface and the second end surface. The display device according to claim 1, wherein an optical member is disposed between the pixel surface and the first light guide plate, and the optical member has a thickness variation so as to have a thickness distribution different from a thickness distribution of the first light guide plate. . The display device according to claim 4, wherein the thickness distribution of the optical member is changed such that the thickness of the first light guide plate is the smallest at the position where the thickness of the first light guide plate is the largest, and the thickness of the first light guide plate is The thickness becomes the largest at the smallest position. The display device according to claim 4, wherein the surface of the display portion facing the side of the first light guide plate and the surface of the first light guide plate facing the display portion are disposed Optical components. The display device according to claim 4, wherein the optical member is disposed between the pixel surface and a surface of the display portion opposite to the side of the first light guide plate. The display device of claim 1, further comprising: a second light source and a second light guide plate disposed on the opposite side of the display portion with respect to the first light guide plate; wherein the second light guide plate has a thickness distribution as follows The first light guide plate The thickness is minimized at the position where the thickness is the largest, and the thickness becomes maximum at the position where the thickness of the first light guide plate is the smallest. The display device according to claim 1, wherein an ND filter is disposed on a side opposite to the display portion with respect to the first light guide plate. The display device according to claim 9, wherein the ND filter has a structure in which a thickness is changed so as to have a thickness distribution different from a thickness distribution of the first light guide plate. The display device of claim 10, wherein the thickness distribution of the ND filter is changed in such a manner that the thickness of the first light guide plate is the smallest at the position where the thickness of the first light guide plate is the largest, and the first light guide plate is The thickness becomes the largest at the position where the thickness is the smallest. The display device of claim 9, wherein the ND filter is locally joined to the first light guide plate. The display device of claim 12, wherein the first light guide plate further includes a second light source that illuminates the second illumination light on a side opposite to the display portion; and between the first light guide plate and the second light source The ND filter is disposed, and the second light source is locally joined to the ND filter. The display device of claim 12, which further comprises a bottom plate; and the ND filter is fixed to the bottom plate. The display device according to claim 1, wherein the first light source is disposed to face at least one of the first end surface and the second end surface. The display device of claim 15, wherein An inclined portion is provided between an end surface of the first end surface and the second end surface facing the first light source and the plurality of scattering regions, wherein the inclined portion is configured to advance the first illumination light to The plurality of scattering regions described above. The display device according to claim 1, further comprising a second light source that is disposed on a side opposite to the display portion with respect to the first light guide plate and that illuminates the second illumination light. The display device of claim 17, wherein the display unit selectively switches between displaying a plurality of viewpoint images based on the three-dimensional image data and an image based on the two-dimensional image data; wherein the second light source is on the display portion When the plurality of viewpoint images are displayed, the image is controlled to be in a non-lighting state, and is controlled to be in a lighting state when the image based on the two-dimensional image data is displayed on the display unit. The display device according to claim 18, wherein the first light source is controlled to be in a lighting state when the plurality of viewpoint images are displayed on the display unit, and the display is displayed on the display unit based on the two-dimensional image data. In the case of an image, it is controlled to a non-lighting state or a lighting state. An electronic device comprising: a display device comprising: a display portion having a pixel surface; and a light source device that emits light for image display toward the display portion; and the light source device includes: one or more a light source that illuminates the first illumination light; and a first light guide plate having a first end surface and a second end surface that face each other, and a plurality of scattering regions are formed between the first end surface and the second end surface The scattering surface is emitted to the outside by scattering the first illumination light in the plurality of scattering regions; The first light guide plate has a shape in which a thickness changes between the first end surface and the second end surface; and a distance between the pixel surface and the scattering surface is maximized by a thickness of the first light guide plate When the air conversion distance at the position is D3 and the air conversion distance at the position where the thickness of the first light guide plate is the smallest is D4, the following conditions are satisfied: | D1-D2 |>| D3-D4 |.. In the case of D1, the pixel surface and the scattering surface are parallel to each other, and the thickness of the display portion is fixed, and the first portion of the display portion and the first light guide plate are air. 1 is an air-converted distance D2 between the pixel surface and the scattering surface at a position where the thickness of the light guide plate is the largest: the pixel surface and the scattering surface are parallel to each other, and the thickness of the display portion is fixed, and the display portion and the first portion are (1) The air-converted distance between the pixel surface and the scattering surface at a position where the thickness of the first light guide plate is the smallest when the light guide plate is air.