JP2013045073A - Display device, electronic equipment and illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of efficiently using irradiation light.SOLUTION: The display device includes an illumination device and a display section which has a plurality of pixels and displays an image using light from the illumination device. The illumination device has: first and second light sources which can be individually lighted; a light guide plate for emitting the light of the first and second light sources which has been emitted from each of the first and second light sources from their own emission surfaces at different angles from each other; and an optical member which includes a first reflection surface that reflects the first light source light from the light guide plate to an opposite side to the light guide plate, and a second reflection surface that reflects the second light source light from the light guide plate to an opposite side to the light guide plate and has a shape different from that of the first reflection surface.

Description

  The present disclosure relates to a display device capable of displaying a stereoscopic image, an electronic device including the display device, and a lighting device mounted on the display device.

  In recent years, stereoscopic display devices that can realize stereoscopic video display (three-dimensional video display) have attracted attention. The stereoscopic display device displays a left-eye image and a right-eye image with parallax (different viewpoints), and according to this, a stereoscopic image with depth can be obtained by an observer looking at each with the left and right eyes. Can be recognized as. In addition, a stereoscopic display device that can provide more natural stereoscopic video to an observer by displaying three or more video images having parallax with each other has been developed.

  Such stereoscopic display devices are roughly classified into those requiring special glasses and those that do not require them. However, the observer feels troublesome for the observer, and those that do not require special glasses are desired. It is rare. Examples of display devices that do not require dedicated glasses include a lenticular lens method and a parallax barrier method. In these methods, a plurality of images with different parallax (viewpoint images) are displayed on the image display panel at the same time, and the images that can be seen differ depending on the relative positional relationship (angle) between the display device and the viewpoint of the observer. ing. As a parallax barrier type display device, for example, there is one described in Patent Document 1. Patent Document 2 proposes a display device that uses an electro-optic prism instead of a lenticular lens or a parallax barrier as a display device that does not require glasses.

Japanese Patent Laid-Open No. 3-119889 JP 2010-243941 A

  By the way, in the stereoscopic display device, when performing stereoscopic video display, a plurality of viewpoint videos are displayed on the screen at the same time. Therefore, the luminance of each viewpoint video is relatively higher than that in the case of performing planar video display (two-dimensional video display). It will decline. Therefore, it is conceivable to increase the power of the backlight when performing stereoscopic video display, but this is not preferable from the viewpoint of power saving. For this reason, improvement of the utilization efficiency of a backlight is desired.

  The present disclosure has been made in view of such problems, and an object of the present disclosure is to provide an irradiation apparatus that switches and emits irradiation light having different directivities according to applications, and an efficient use of irradiation light by including the irradiation apparatus. An object is to provide a display device and an electronic device that can be used.

  The illumination device according to the present disclosure is for a display device, and can be individually turned on, first and second light sources, and first and second light sources emitted from the first and second light sources, respectively. A light guide plate that emits light at different angles from its emission surface, a first reflection surface that reflects first light source light from the light guide plate to the opposite side of the light guide plate, and a second light from the light guide plate And an optical member that includes a second reflecting surface that reflects the light source light to the side opposite to the light guide plate and has a shape different from that of the first reflecting surface.

  A display device according to the present disclosure includes the above-described illumination device and a display unit that has a plurality of pixels and performs video display using light from the illumination device. Moreover, an electronic apparatus according to the present disclosure includes the display device described above.

  In the illumination device, the display device, and the electronic apparatus according to the present disclosure, in the optical member, the first reflection surface and the second reflection surface have different shapes. Therefore, the first and second light source lights reflected to the opposite side of the light guide plate by the optical member express directivities with different intensities.

  According to the illumination device of the present disclosure, irradiation light having a light distribution according to the shape of the first reflection surface and irradiation light having a light distribution according to the shape of the second reflection surface are individually generated. Can be made. That is, for example, by switching between the first light source and the second light source and lighting them, two irradiation lights having different directivities can be appropriately switched and generated. Therefore, according to the display device and the electronic apparatus of the present disclosure including the illumination device, it is possible to display image light having high luminance in a necessary direction depending on the application. For example, when performing planar image display, irradiation light having no emission angle dependency is generated. On the other hand, when performing stereoscopic image display, for example, irradiation light having strong directivity in the front direction of the screen (high front luminance) is generated. Thereby, the relative brightness | luminance fall at the time of performing a three-dimensional video display can be relieved. Alternatively, the first light source and the second light source may be switched and turned on according to the number of observers. For example, when observing with a large number of people, irradiation light that generates a certain level of light intensity over a wider angle range is generated, whereas when observing with a small number of people such as one person, directivity is high (high front luminance). ) Use methods such as generating irradiation light to save power can be considered.

It is a block diagram showing the example of 1 structure of the display apparatus which concerns on one embodiment of this indication. It is a perspective view showing the example of whole structure of the display apparatus shown in FIG. It is explanatory drawing showing the example of 1 structure of the backlight shown in FIG. It is explanatory drawing which expands and represents the principal part of the backlight shown in FIG. FIG. 4 is a schematic diagram for explaining the direction of light emitted from the light guide plate shown in FIG. 3 and a characteristic diagram showing a light distribution of the light. It is a characteristic view showing the light distribution of the irradiation light from the backlight shown in FIG. FIG. 2 is an explanatory diagram illustrating a configuration example of a display unit and a display driving unit illustrated in FIG. 1. FIG. 8 is an explanatory diagram illustrating a configuration example of a pixel circuit illustrated in FIG. 7 and a cross-sectional configuration example of a pixel. FIG. 2 is an explanatory diagram illustrating a configuration example of a liquid crystal barrier unit illustrated in FIG. 1. FIG. 2 is an explanatory diagram illustrating a group configuration example of a liquid crystal barrier unit illustrated in FIG. 1. It is a schematic diagram showing an example of operation | movement of the display part and liquid crystal barrier part which were shown in FIG. FIG. 10 is another schematic diagram illustrating an example of operations of the display unit and the liquid crystal barrier unit illustrated in FIG. 1. It is a perspective view showing the structure of the television apparatus as an electronic device using a display apparatus.

Hereinafter, embodiments will be described in detail with reference to the drawings. The description will be given in the following order.
1. Embodiment (FIGS. 1 to 12): Example using a backlight (display device)
2. Application Example (FIG. 13): Application Example of Display Device (Electronic Device)

<First Embodiment>
[Configuration example]
(Overall configuration example)
FIG. 1 is a block diagram illustrating a configuration example of the display device 100 according to the first embodiment of the present disclosure. The display device 100 can realize both stereoscopic video display (three-dimensional display) and planar video display (two-dimensional display). The display unit 100 includes a liquid crystal barrier unit 10, a display unit 20, a backlight 30, a barrier drive unit 40, a display drive unit 50, a backlight drive unit 60, and a control unit 70. In the present embodiment, the horizontal direction of the screen of display unit 20 is the X-axis direction, the vertical direction of the screen is the Y-axis direction, and the direction orthogonal to the screen is the Z-axis direction.

  The control unit 70 supplies control signals to the barrier driving unit 40, the display driving unit 50, and the backlight driving unit 60 based on the video signal Sdisp supplied from the outside, and these operate in synchronization with each other. It is the circuit which controls to do. Specifically, the control unit 70 supplies a barrier control signal CBR to the barrier drive unit 40, supplies a video signal S based on the video signal Sdisp to the display drive unit 50, and supplies the backlight drive unit 60 with the video signal S. On the other hand, a backlight control signal CBL is supplied. Here, when the display device 100 performs stereoscopic video display, the video signal S is composed of video signals SA and SB each including a plurality of (six in this example) viewpoint videos, as will be described later. It is.

  The display driving unit 50 drives the display unit 20 based on the video signal S supplied from the control unit 70. In this example, the display unit 20 is a liquid crystal display unit, and performs display by driving a liquid crystal display element and modulating light emitted from the backlight 30. The display unit 20 is, for example, a transmissive liquid crystal display panel (LCD) in which each pixel is driven according to the video signal S1.

  The backlight drive unit 60 drives the backlight 30 based on the backlight control signal CBL supplied from the control unit 40. The backlight 30 is an illumination device that irradiates the display unit 20 with illumination light from behind. A detailed configuration of the backlight 30 will be described later.

  The barrier driving unit 40 drives the liquid crystal barrier unit 10 based on the barrier control signal CBR supplied from the control unit 70. The liquid crystal barrier unit 10 transmits (opens operation) or blocks (closes operation) light emitted from the backlight 30 and transmitted through the display unit 20, and includes a plurality of opening / closing units 11, 12 configured using liquid crystal. (Described later).

  FIG. 2 is an exploded perspective view illustrating a configuration example of a main part of the display device 100. As shown in FIG. 2, in the display device 100, the backlight 30, the display unit 20, and the liquid crystal barrier unit 10 are arranged in this order. That is, the light emitted from the backlight 30 reaches the observer through the display unit 20 and the liquid crystal barrier unit 10.

(Backlight)
Here, the configuration of the backlight 30 will be described with reference to FIG. 3 in addition to FIG. 2. FIG. 3 is a conceptual diagram illustrating the configuration of the backlight 30. As shown in FIG. 2, in the display device 100, the backlight 30 is disposed behind the display unit 20. The backlight 30 is opposed to, for example, the light guide plate 1, a pair of light sources 2 (2 </ b> A and 2 </ b> B) disposed so as to face both end faces of the light guide plate 1, and the surface (light emission surface) 1 </ b> S of the light guide plate 1. The prism sheet 3 is arranged so as to be.

<Light source>
The light source 2 is a linear light source. For example, a hot cathode fluorescent lamp (HCFL), a cold cathode fluorescent lamp (CCFL), or a plurality of LEDs (Light Emitting Diodes) are arranged in a line. It consists of things. When the light source 2 consists of a plurality of LEDs, it is preferable that all the LEDs are white LEDs from the viewpoints of efficiency, thickness reduction, and uniformity.

<Light guide plate>
The light guide plate 1 guides light from the light source 2 to the prism sheet 3. The light guide plate 1 has a shape corresponding to the display unit 20 arranged so as to overlap therewith, for example, a rectangular parallelepiped shape surrounded by a front surface 1S, a back surface, and an end surface connecting them. Hereinafter, of the end faces of the light guide plate 1, end faces on which light from the light source 2 is incident are referred to as light incident faces 1A and 1B. For example, as shown in FIGS. 4 (A) and 4 (B), the light guide plate 1 is configured such that light emitted from the light sources 2A and 2B and transmitted through the light incident surfaces 1A and 1B is constant with respect to the XY plane. The light beams L11 and L21 having an angle are emitted from the surface 1S. For example, the light guide plate 1 mainly includes a transparent thermoplastic resin such as polycarbonate resin (PC) or acrylic resin (polymethyl methacrylate (PMMA)).

  As shown in FIGS. 4A and 4B, the surface 1S of the light guide plate 1 is not flat but has undulations. More specifically, the surface 1S is formed by alternately arranging two types of inclined surfaces 1SA and 1SB inclined with respect to an XY plane parallel to the screen of the display unit 20. The inclined surfaces 1SA and 1SB are different in inclination direction with respect to the XY plane. That is, the inclined surface 1SA is a downwardly inclined surface that is inclined so as to be further away from the prism sheet 3 as it is further away from the light source 2A (incident surface 1A), for example. On the other hand, the inclined surface 1SB is a downwardly inclined surface that is inclined so as to be further away from the prism sheet 3 as it is further away from the light source 2B (incident surface 1B). FIG. 4 is a schematic diagram of an XZ cross section of the light guide plate 1. The inclined surfaces 1SA and 1SB each have an angle of α (a value on the narrow angle side), for example, with respect to the XY plane. The magnitude of the angle may be different between the slope 1SA and the slope 1SB. In FIGS. 4A and 4B, a plane parallel to the XY plane exists between the slope 1SA and the slope 1SB. However, such a parallel face need not be provided.

  Among the plurality of inclined surfaces 1SA, the one located closest to the incident surface 1A on which the light source 2A is disposed has the smallest width (length in the X-axis direction), and the one located farther from the incident surface 1A. It has a wide width (see FIG. 4A). On the other hand, among the plurality of inclined surfaces 1SB, the one located closest to the incident surface 1B on which the light source 2B is disposed has the smallest width (length in the X-axis direction) and is located away from the incident surface 1B. It has a wider width (see FIG. 4B). For this reason, the surface 1S of the light guide plate 1 is convex as a whole. In addition, what is necessary is just to set suitably according to the design and specification of the backlight 30 about how the width | variety of 1 SSA and 1SB is changed.

The propagation of light from the light source 2A will be described. As shown in FIG. 4A, it is assumed that light from the light source 2A enters the light guide plate 1 from the incident surface 1A and is totally reflected at the reflection angle φ1p on the back surface 1SS. For convenience of explanation, it is assumed that light propagates along the XZ plane in FIG. It is assumed that the light totally reflected on the back surface 1SS is incident on the surface 1S at an angle φ1a exceeding the critical angle and totally reflected toward the back surface 1SS. In the example shown in FIG. 4A, light is incident on the inclined surface 1SA and totally reflected. The angle φ2p at which the light is incident on the back surface 1SS is φ2p = φ1a−2 × α because the slope 1SA rises to the left. That is, each time light is reflected by the inclined surface 1SA, the relationship that the incident angle of light to the back surface 1SS decreases by 2 × α is established. Here, the angle .phi.2 _p is greater than the critical angle, the light totally reflected at the back 1SS shall be incident at an angle .phi.2 _a the surface 1S. In the example shown in FIG. 4A, light is incident on the slope 1SA, and φ2 _a = φ2 _p −α. When light is incident on the inclined surface 1SB, φ2 _a = φ2 _p + α. When the angle φ2 _a is equal to or smaller than the critical angle, light is emitted from the surface 1S to the outside. When the angle φ2 _a exceeds the critical angle, the light is totally reflected at the surface 1S and travels toward the back surface 1SS again. As described above, since the angle φ2 _a becomes smaller on the slope 1SA, the light from the light source 2A is mainly emitted as light L11 from the slope 1SA.

  On the other hand, the propagation of light from the light source 2B is as shown in FIG. That is, the light from the light source 2B is mainly emitted as the light L21 from the inclined surface 1SB.

  FIG. 5A is a schematic diagram for explaining the direction of the light L11 emitted from the light guide plate 1 when the light source 2A emits light. FIG. 5B is a graph for explaining an example of the relationship between the intensity of the light L11 emitted from the light guide plate 1 when the light source 2A emits light and the direction in which the light L11 is emitted. In FIG. 5A, the angle (emergence angle) φC formed by the Z-axis direction and the light traveling direction takes a value when the light rises to the right on the paper surface of FIGS. 4A and 4B. The value was negative when positive and leftward. The intensity of light is normalized and shown with a maximum value of 1. In this example, the light L11 shows a light intensity distribution centered at about 60 to 70 ° with respect to the Z-axis.

  On the other hand, the direction of the light L21 emitted from the light guide plate 1 when the light source 2B emits light is the left-right inverted version of FIG. The relationship between the intensity of the light L21 emitted from the light guide plate 1 when the light source 2B emits light and the direction in which the light L21 is emitted is obtained by inverting the sign of the angle φC in FIG. Therefore, the description is omitted.

  Thus, when the light source 2A is turned on, the light L11 that rises to the right is emitted from the light guide plate 1, and when the light source 2B is turned on, the light L21 that is raised to the left from the light guide plate 1 is emitted.

<Prism sheet>
As shown in FIGS. 2 and 3, the prism sheet 3 has a plurality of substantially triangular prisms 33 each having an apex P <b> 1 and extending in the Y-axis direction arranged in the X-axis direction. Each prism 33 has a substantially triangular shape in the XZ section, and has a pair of surfaces 31 and 32 that form a vertex P <b> 1 facing the light guide plate 1. However, at least one of the pair of surfaces 31 and 32 is a curved surface (spherical surface or aspherical surface), for example, swells outward (to the light guide plate 1 side). FIG. 3 illustrates a case where both the pair of surfaces 31 and 32 are curved surfaces. Further, the shapes of the surfaces 31 and 32 are different from each other. Therefore, in the prism sheet 3, two types of surfaces 31 and 32 are alternately arranged along the X-axis direction. The shape of the XZ cross section of the prism 33 does not change along the Y axis and is constant. It is desirable that the arrangement pitch of the prisms 33 in the prism sheet 3 and the arrangement pitch of the opening / closing sections 11 and 12 in the liquid crystal barrier section 10 or the arrangement pitch of the pixels Pix in the display section are not values that are integral multiples of each other. This is to avoid the occurrence of moire. Here, the light L21 from the light guide plate 1 passes through the surface 32 and enters the prism 33, is totally reflected by the surface 31, and travels toward the display unit 20 as reflected light L12. On the other hand, after passing through the surface 31, the light L22 is totally reflected by the surface 32 and travels toward the display unit 20 as reflected light L22. The traveling directions of the lights L11 and L21 from the light guide plate 1 are as follows. The vertex P1 of an arbitrary prism 33 _n and the connection point P2 between the adjacent prism 33 _{n + 1} and the two adjacent prisms 33 _{n + 2.} It is preferable to have a smaller angle with respect to the XY plane than the straight line 34 that passes through. This is to ensure that the light L11 transmitted through the surface 32 and the light L21 transmitted through the surface 31 are totally reflected at the surface 31 or the surface 32. That is, the light L11 is incident on the surface 31 and then totally reflected to become the light L12. The light L21 is incident on the surface 32 and then totally reflected to become the light L22.

  The prism sheet 3 has a function of converting the light L11 and L21 from the light guide plate 1 into light L12 and L22 having desired directivity. That is, the lights L12 and L22 reflected on the surface 31 and the surface 32 have a light distribution according to the shapes of the surface 31 and the surface 32. When the light source 2A is turned on, for example, as shown in FIG. 6A, light L12 of intensity distribution (light distribution) 3A showing directivity in the front direction is generated. On the other hand, when the light source 2B is turned on, for example, as shown in FIG. 6B, light L22 having a broader and more uniform intensity distribution (light distribution) 3B around the front direction is generated. In FIGS. 6A and 6B, the horizontal axis represents an angle with the front direction (Z-axis direction) being 0 °. 6 (A) and 6 (B) show the light surfaces L11 and L21 having the light distribution shown in FIG. 5 (B) as surfaces 31 having a spherical surface with curvature radii of 0.15 mm and 0.90 mm, respectively. , 32 represents the light distribution when reflected. At that time, the apex angle of each prism 33 was 64 °, and the arrangement pitch of the prisms 33 in the X-axis direction was 0.10 mm. Although the light distribution 3A shown in FIG. 6A has an asymmetric shape, it is possible to improve the symmetry by making the surface 31 an aspherical surface. It is considered that an observer can visually recognize a more natural image by guiding irradiation light having a light distribution with excellent left-right symmetry to the display unit 20.

(Display drive unit and display unit)
FIG. 7 illustrates an example of a block diagram of the display driving unit 50 and the display unit 20. The display driving unit 50 includes a timing control unit 51, a gate driver 52, and a data driver 53. The timing control unit 51 controls the drive timing of the gate driver 52 and the data driver 53, and supplies the video signal S supplied from the control unit 40 to the data driver 53 as the video signal S1. The gate driver 52 sequentially selects the pixels Pix in the display unit 20 for each row in accordance with timing control by the timing control unit 51, and performs line sequential scanning. The data driver 53 supplies a pixel signal based on the video signal S <b> 1 to each pixel Pix of the display unit 20. Specifically, the data driver 53 generates a pixel signal that is an analog signal by performing D / A (digital / analog) conversion based on the video signal S1, and supplies the pixel signal to each pixel Pix. Yes.

  FIG. 8 illustrates a configuration example of the display unit 20, (A) illustrates an example of a circuit diagram of the pixel Pix, and (B) illustrates a cross-sectional configuration of the display unit 20.

  As shown in FIG. 8A, the pixel Pix includes a TFT (Thin Film Transistor) element Tr, a liquid crystal element LC, and a storage capacitor element C. The TFT element Tr is configured by, for example, a MOS-FET (Metal Oxide Semiconductor-Field Effect Transistor), the gate is connected to the gate line G, the source is connected to the data line D, and the drain is the liquid crystal element LC. One end and one end of the storage capacitor element C are connected. The liquid crystal element LC has one end connected to the drain of the TFT element Tr and the other end grounded. The storage capacitor element C has one end connected to the drain of the TFT element Tr and the other end connected to the storage capacitor line Cs. The gate line G is connected to the gate driver 52, and the data line D is connected to the data driver 53.

  FIG. 8B illustrates a cross-sectional configuration of the display unit 20 including the pixel Pix. As described above, the display unit 20 is obtained by sealing the liquid crystal layer 203 between the driving substrate 201 and the counter substrate 205 in a cross section. Examples of the liquid crystal material constituting the liquid crystal layer 203 include VA mode, IPS mode, and TN mode liquid crystals using nematic liquid crystals. The drive substrate 201 is formed with a pixel drive circuit including the TFT element Tr. On the drive substrate 201, a pixel electrode 202 is disposed for each pixel Pix. A color filter and a black matrix (not shown) are formed on the counter substrate 205, and a counter electrode 204 is disposed on the surface on the liquid crystal layer 203 side as a common electrode for each pixel Pix. The polarizing plates 206A and 206B are bonded to the light incident side (here, the backlight 30 side) and the light emission side (here, the observer side) of the display unit 20 so as to be in crossed Nicols or parallel Nicols. It has been.

(Liquid crystal barrier unit 10)
FIG. 9 shows an example of the configuration of the liquid crystal barrier unit 10, (A) shows the arrangement of the open / close units in the liquid crystal barrier unit 10, and (B) shows the V− of the liquid crystal barrier unit 10 in (A). The cross-sectional structure of a V arrow direction is shown. In this example, the liquid crystal barrier unit 10 performs a normally black operation. In other words, the liquid crystal barrier unit 10 blocks light when not driven.

  The liquid crystal barrier unit 10 is a so-called parallax barrier, and includes a plurality of open / close units (liquid crystal barriers) 11 and 12 that transmit or block light, as shown in FIG. These open / close sections 11 and 12 perform different operations depending on whether the stereoscopic display device 1 performs normal display (two-dimensional display) or stereoscopic display. Specifically, as will be described later, the opening / closing unit 11 is in an open state (transmission state) during normal display, and is in a closed state (blocking state) when performing stereoscopic display. . As will be described later, the opening / closing unit 12 performs an opening / closing operation in a time-division manner in an open state (transmission state) during normal display and in a stereoscopic display.

  The opening / closing part 11 and the opening / closing part 12 are provided so as to extend in one direction on the XY plane (here, for example, a direction forming a predetermined angle θ from the vertical direction Y). Thus, the moire of the three-dimensional display device 1 can be reduced by forming the opening / closing parts 11 and 12 so as to extend in an oblique direction. The width E1 of the opening / closing part 11 and the width E2 of the opening / closing part 12 are different from each other, and here, for example, E1> E2. However, the magnitude relationship between the widths of the open / close sections 11 and 12 is not limited to this, and may be E1 <E2 or E1 = E2. Such open / close sections 11 and 12 are configured to include a liquid crystal layer (a liquid crystal layer 19 to be described later), and the open / close is switched by a driving voltage applied to the liquid crystal layer 19.

  As shown in FIG. 9B, the liquid crystal barrier unit 10 includes a liquid crystal layer 19 between a transparent substrate 13 and a transparent substrate 16 made of, for example, glass. In this example, the transparent substrate 13 is disposed on the light incident side, and the transparent substrate 16 is disposed on the light emitting side. Transparent electrode layers 15 and 17 made of, for example, ITO are formed on the surface of the transparent substrate 13 on the liquid crystal layer 19 side and the surface of the transparent substrate 16 on the liquid crystal layer 19 side, respectively. Polarizing plates 14 and 18 are bonded to the light incident side of the transparent substrate 13 and the light emitting side of the transparent substrate 16. For the liquid crystal layer 19, for example, VA (vertical alignment) mode liquid crystal is used.

  The transparent electrode layer 15 has a plurality of transparent electrodes 110 and 120. The transparent electrode layer 17 is provided as an electrode common to the transparent electrodes 110 and 120. In this example, 0 V is applied to the transparent electrode layer 17. The transparent electrode 110 of the transparent electrode layer 15 and the portion of the transparent electrode layer 17 corresponding to the transparent electrode 110 constitute the opening / closing part 11. Similarly, the transparent electrode 120 of the transparent electrode layer 15 and the portion of the transparent electrode layer 157 corresponding to the transparent electrode 120 constitute the opening / closing part 12. With such a configuration, in the liquid crystal barrier unit 10, the voltage is selectively applied to the transparent electrodes 110 and 120, and the liquid crystal layer 19 has the liquid crystal orientation corresponding to the voltage, thereby opening and closing each of the switching units 11 and 12. The operation can be performed. An alignment film (not shown) is formed on the surface of the transparent electrode layers 15 and 17 on the liquid crystal layer 19 side.

  The polarizing plates 14 and 18 control the polarization directions of incident light and outgoing light to the liquid crystal layer 19. The transmission axis of the polarizing plate 14 is arranged in the horizontal direction X, for example, and the transmission axis of the polarizing plate 18 is arranged in the vertical direction Y, for example. That is, the transmission axes of the polarizing plates 14 and 18 are arranged so as to be orthogonal to each other.

  With this configuration, when a voltage is applied to the transparent electrode layer 15 (transparent electrodes 110 and 120) and the transparent electrode layer 17 to increase the potential difference, the light transmittance in the liquid crystal layer 19 increases, and the open / close portions 11 and 12 It becomes a transmission state (open state). On the other hand, when the potential difference is reduced, the light transmittance in the liquid crystal layer 19 is reduced, and the open / close portions 11 and 12 are cut off (closed).

  In this example, the liquid crystal barrier unit 10 performs a normally black operation. However, the liquid crystal barrier unit 10 is not limited thereto, and may instead perform a normally white operation, for example. In this case, when the potential difference between the transparent electrode layer 15 and the transparent electrode layer 17 becomes large, the open / close portions 11 and 12 are cut off, and when the potential difference becomes small, the open / close portions 11 and 12 become transparent. In addition, selection of normally black operation | movement and normally white operation | movement can be set with a polarizing plate and a liquid crystal orientation, for example.

  In the liquid crystal barrier section 10, the plurality of opening / closing sections 12 constitute a group, and the plurality of opening / closing sections 12 belonging to the same group perform an opening operation and a closing operation at the same timing when performing stereoscopic display. . Below, the group of the opening-and-closing part 12 is demonstrated.

  FIG. 10 illustrates a group configuration example of the opening / closing unit 12. The opening / closing part 12 constitutes two groups in this example. Specifically, every other plurality of opening / closing sections 12 arranged in groups constitute group A and group B, respectively. In the following description, the opening / closing part 12A is appropriately used as a generic name of the opening / closing parts 12 belonging to the group A, and similarly, the opening / closing part 12B is appropriately used as a generic name of the opening / closing parts 12 belonging to the group B.

  When performing stereoscopic display, the barrier driving unit 41 drives the plurality of opening / closing units 12 belonging to the same group to perform opening / closing operations at the same timing. Specifically, as described later, the barrier driving unit 41 alternately opens and closes a plurality of opening / closing units 12A belonging to the group A and a plurality of opening / closing units 12B belonging to the group B in a time-division manner. To drive.

  FIG. 11 schematically illustrates the state of the liquid crystal barrier unit 10 when performing stereoscopic image display and planar image display using a cross-sectional structure, and (A) illustrates a state in which stereoscopic display is performed. (B) shows another state in which stereoscopic display is performed, and (C) shows a state in which normal display is performed. In the liquid crystal barrier section 10, the opening / closing sections 11 and the opening / closing sections 12 (opening / closing sections 12A, 12B) are alternately arranged. In this example, the opening / closing unit 12 </ b> A is provided at a ratio of one to six pixels Pix of the display unit 20. Similarly, the opening / closing part 12B is provided at a ratio of one to the six pixels Pix of the display part 20. In the following description, the pixel Pix is a pixel composed of three subpixels (RGB). However, the present invention is not limited to this. For example, the pixel Pix may be a subpixel. Further, in the liquid crystal barrier unit 10, a portion where light is blocked is indicated by hatching.

  When performing stereoscopic video display, video signals SA and SB are alternately supplied to the display driving unit 50, and the display unit 20 performs display based on them. In the liquid crystal barrier unit 10, the opening / closing unit 12 (opening / closing units 12 </ b> A, 12 </ b> B) performs an opening / closing operation in a time-sharing manner, and the opening / closing unit 11 maintains a closed state (blocking state). Specifically, when the video signal SA is supplied, as shown in FIG. 11A, the opening / closing part 12A is opened and the opening / closing part 12B is closed. In the display unit 20, as will be described later, six adjacent pixels Pix arranged at positions corresponding to the opening / closing unit 12A perform display corresponding to the six viewpoint videos included in the video signal SA. Thereby, as will be described later, the observer feels the displayed video as a three-dimensional video, for example, by viewing different viewpoint videos for the left eye and the right eye. Similarly, when the video signal SB is supplied, as shown in FIG. 11B, the opening / closing part 12B is opened and the opening / closing part 12A is closed. In the display unit 20, as will be described later, six adjacent pixels Pix arranged at positions corresponding to the opening / closing unit 12B perform display corresponding to the six viewpoint videos included in the video signal SB. Thereby, as will be described later, the observer feels the displayed video as a three-dimensional video, for example, by viewing different viewpoint videos for the left eye and the right eye. In the stereoscopic display device 1, the resolution of the display device can be increased as will be described later by alternately opening the opening / closing portions 12 </ b> A and the opening / closing portions 12 </ b> B to display images.

  In the case of performing a flat image display, in the liquid crystal barrier unit 10, as shown in FIG. 11C, the opening / closing unit 11 and the opening / closing unit 12 (opening / closing units 12A and 12B) are both maintained in the open state (transmission state). It is supposed to be. As a result, the observer can view the normal two-dimensional video displayed on the display unit 20 based on the video signal S as it is.

[Operation and Action]
Subsequently, the operation and action of the display device 100 of the present embodiment will be described.

(Overview of overall operation)
First, an overall operation overview of the display device 100 will be described with reference to FIG. The control unit 70 supplies control signals to the display driving unit 50, the backlight driving unit 60, and the barrier driving unit 40 based on the video signal Vdisp supplied from the outside, and these are synchronized with each other. Control to work. The backlight drive unit 60 drives the backlight 30 based on the backlight control signal CBL supplied from the control unit 70. Specifically, the light source 2A is turned on when the display unit 20 performs stereoscopic video display, and the light source 2B is turned on when planar image display is performed. The backlight 30 emits light L12 or light L22 to the display unit 20. The display driving unit 50 drives the display unit 20 based on the video signal S supplied from the control unit 70. The display unit 20 performs display by modulating the light L12 or the light L22 emitted from the backlight 30. The barrier driving unit 40 drives the liquid crystal barrier unit 10 based on the barrier control signal CBR supplied from the control unit 70. The open / close units 11 and 12 (12A and 12B) of the liquid crystal barrier unit 10 perform an open / close operation based on the barrier control signal CBR, and transmit or block light emitted from the backlight 30 and transmitted through the display unit 20.

(3D image display operation)
Next, with reference to FIG. 12 etc., detailed operation | movement in the case of performing a three-dimensional video display is demonstrated.

  FIG. 12 illustrates an operation example of the display unit 20 and the liquid crystal barrier unit 10. Specifically, FIG. 12A shows a case where the video signal SA is supplied, and FIG. 12B shows a case where the video signal SB is supplied.

  When the video signal SA is supplied, as shown in FIG. 12A, each of the pixels Pix of the display unit 20 has pixel information P1 corresponding to each of the six viewpoint videos included in the video signal SA. ~ P6 is displayed. At this time, the pixel information P1 to P6 is respectively displayed on the pixels Pix arranged in the vicinity of the opening / closing part 12A. When the video signal SA is supplied, the liquid crystal barrier unit 10 is controlled so that the opening 12A is in an open state (transmission state) and the opening 12B is in a closed state. The light emitted from each pixel Pix of the display unit 20 is output with its angle limited by the opening / closing unit 12A. The observer can recognize a stereoscopic image by viewing the pixel information P3 with the left eye and the pixel information P4 with the right eye, for example.

  When the video signal SB is supplied, as shown in FIG. 12B, each of the pixels Pix of the display unit 20 has pixel information P1 corresponding to each of the six viewpoint videos included in the video signal SB. ~ P6 is displayed. At this time, the pixel information P1 to P6 is respectively displayed on the pixels Pix arranged in the vicinity of the opening / closing part 12B. When the video signal SB is supplied, the liquid crystal barrier unit 10 is controlled so that the opening part 12B is in an open state (transmission state) and the opening part 12A is in a closed state. The light emitted from each pixel Pix of the display unit 20 is output with its angle limited by the opening / closing unit 12B. The observer can recognize a stereoscopic image by viewing the pixel information P3 with the left eye and the pixel information P4 with the right eye, for example.

  Thus, the observer sees different pixel information among the pixel information P1 to P6 with the left eye and the right eye, and the observer can feel as a stereoscopic image. Also, by opening and closing the opening / closing sections 12A and 12B alternately in a time-division manner and displaying the images, the observer can average the images displayed at positions shifted from each other. Therefore, the display device 1 can realize twice the resolution as compared with the case where only the opening / closing part 12A is provided. In other words, the resolution of the display device 1 is only 1/3 (= 1/6 × 2) as compared with the case of the two-dimensional display.

  As described above, when the display unit 20 displays a stereoscopic image, the light L2 is generated by turning on the light source 2A, and the light L11 is reflected by the surface 31 of each prism 33. By doing so, for example, the irradiation light L12 indicating the light distribution 3A shown in FIG. Accordingly, the observer can recognize a stereoscopic image with higher luminance by being positioned in the vicinity of the front surface of the display unit 20.

(Operation of flat image display)
When performing planar video display, both the open / close unit 11 and the open / close unit 12 in the liquid crystal barrier unit 10 are opened, and the image light of the planar video displayed on the display unit 20 based on the video signal S is transmitted as it is. Note that, as described above, when the display unit 20 performs flat image display, the light L2 is generated by turning on the light source 2B, and the light L21 is reflected by the surface 32 of each prism 33. By doing so, for example, the irradiation light L22 indicating the light distribution 3B shown in FIG. Thereby, the viewing angle over a wider range can be secured.

[effect]
As described above, in the present embodiment, the backlight 30 individually generates the light L12 having a light distribution according to the shape of the surface 31 and the light L22 having a light distribution according to the shape of the surface 32. Can be made. That is, for example, by switching between the light source 2A and the light source 2B and turning on the light, two irradiation lights having different directivities can be appropriately switched and generated. Therefore, according to the display device 100 including the backlight 30, it is possible to display image light having high luminance in a necessary direction depending on the application, though the configuration is simple. For example, as described above, light L22 having a light distribution with little bias is generated when displaying a flat image. On the other hand, when performing stereoscopic image display, light L12 having high directivity in the front direction of the screen (high front luminance) is generated. Thereby, the relative brightness | luminance fall at the time of performing a three-dimensional video display can be relieved.

  Alternatively, as another method of use, when performing planar image display, the light source 2A and the light source 2B may be switched on according to the number of observers (viewers). For example, when observing (viewing) with a large number of people, the light L22 is generated that provides a light intensity of a certain level or more with a wider viewing angle, whereas when observing with a small number of people such as one person, the directivity is strong (frontal). A use method of generating light L21 having a high luminance is conceivable. In this case, when viewing with a small number of people, sufficient luminance can be obtained even if the power of the light source 2A is reduced, so that power saving can be achieved.

[Application example of display device (electronic equipment)]
Next, application examples of the above display device will be described.

  The display device of the present technology can be applied to electronic devices for various uses, and the type of the electronic device is not particularly limited. This display device can be mounted on, for example, the following electronic devices. However, the configuration of the electronic device described below is merely an example, and the configuration can be changed as appropriate.

  FIG. 13 shows an external configuration of the television device. This television apparatus includes, for example, a video display screen unit 200 as a display device. The video display screen unit 200 includes a front panel 210 and a filter glass 220.

  The display device of the present technology is used as a video display portion in, for example, a tablet personal computer (PC), a notebook PC, a mobile phone, a digital still camera, a video camera, or a car navigation system in addition to the television device shown in FIG. be able to.

  Although the present technology has been described with reference to some embodiments, the present technology is not limited to these embodiments and the like, and various modifications are possible. For example, in the above embodiment, two light sources are switched and turned on, and each light source light is reflected on the surfaces 31 and 32 having different shapes, so that the light distributions in the horizontal direction (X-axis direction) are different from each other. A kind of irradiation light was generated. However, in the present technology, the light distribution in the screen vertical direction (Y-axis direction) may be different from each other. In this case, for example, the shapes of the incident surfaces 1A and 1B of the light guide plate 1 may be different curved surfaces (lens surfaces) so that different light converging (diverging) actions can be expressed in the Y-axis direction. In addition, the present technology is not limited to the case where only one of the two light sources is turned on. Two light sources may be turned on at the same time depending on the application and purpose.

Moreover, this technique can take the following structures.
(1)
A lighting device;
A display unit having a plurality of pixels and performing video display using light from the illumination device,
The lighting device includes:
First and second light sources that can be individually lit;
A light guide plate that emits the first and second light source light respectively emitted from the first and second light sources at different angles from its emission surface;
A first reflecting surface for reflecting the first light source light from the light guide plate to the opposite side of the light guide plate; a second reflection surface of the second light source from the light guide plate to the opposite side of the light guide plate; And an optical member including a second reflecting surface having a different shape from the first reflecting surface.
(2)
The display device according to (1), wherein a plurality of the first and second reflecting surfaces are alternately arranged in the first direction.
(3)
The display device according to (2), wherein the first and second reflecting surfaces are stretched to have a certain shape in a second direction orthogonal to the first direction.
(4)
A plurality of prisms whose apexes are the first contact points between the adjacent first reflection surface and the second reflection surface are arranged so as to be in contact with each other at the second contact point in the first direction (3) The display device described in 1.
(5)
A straight line passing through both the first contact point of one prism and the second contact point of the adjacent prism and the second adjacent prism is the first and second directions with respect to the first direction. The display device according to (4), wherein the angle is greater than the second angle.
(6)
The display device according to any one of (1) to (5), wherein each of the first and second reflection surfaces is a curved surface.
(7)
The display according to any one of (1) to (6), wherein the first and second reflecting surfaces respectively totally reflect the first and second light source light from the light guide plate. apparatus.
(8)
All of the first light source light is incident on the first reflecting surface;
The display device according to any one of (1) to (7), wherein all of the second light source light is incident on the second reflecting surface.
(9)
An electronic device including a lighting device and a display device that includes a plurality of pixels and a display unit that performs video display using light from the lighting device,
The lighting device includes:
First and second light sources that can be individually lit;
A light guide plate that emits the first and second light source light respectively emitted from the first and second light sources at different angles from its emission surface;
A first reflecting surface for reflecting the first light source light from the light guide plate to the opposite side of the light guide plate; a second reflection surface of the second light source from the light guide plate to the opposite side of the light guide plate; An electronic device comprising: an optical member including a first reflecting surface and a second reflecting surface having a different shape.
(10)
A lighting device for a display device,
First and second light sources that can be individually lit;
A light guide plate that emits the first and second light source light respectively emitted from the first and second light sources at different angles from its emission surface;
A first reflecting surface for reflecting the first light source light from the light guide plate to the opposite side of the light guide plate; a second reflection surface of the second light source from the light guide plate to the opposite side of the light guide plate; And an optical member including a second reflecting surface having a shape different from that of the first reflecting surface.

  DESCRIPTION OF SYMBOLS 1 ... Light guide plate, 1A, 1B ... Light incident surface, 2 (2A, 2B) ... Light source, 3 ... Prism sheet, 10 ... Liquid crystal barrier part, 20 ... Display part, 30 ... Backlight, 31, 32 ... Surface, 33 DESCRIPTION OF SYMBOLS ... Prism, 40 ... Barrier drive part, 50 ... Display drive part, 60 ... Backlight drive part, 70 ... Control part, 100 ... Display apparatus.

Claims (10)

A lighting device;
A display unit having a plurality of pixels and performing video display using light from the illumination device,
The lighting device includes:
First and second light sources that can be individually lit;
A light guide plate that emits the first and second light source light respectively emitted from the first and second light sources at different angles from its emission surface;
A first reflecting surface for reflecting the first light source light from the light guide plate to the opposite side of the light guide plate; a second reflection surface of the second light source from the light guide plate to the opposite side of the light guide plate; And an optical member including a second reflecting surface having a different shape from the first reflecting surface. The display device according to claim 1, wherein a plurality of the first and second reflecting surfaces are alternately arranged in the first direction. The display device according to claim 2, wherein the first and second reflecting surfaces are extended so as to have a certain shape in a second direction orthogonal to the first direction. The plurality of prisms having apexes of first contact points between the adjacent first reflection surface and the second reflection surface are arranged so as to contact each other at the second contact point in the first direction. Display device. A straight line passing through both the first contact point of one prism and the second contact point of the adjacent prism and the second adjacent prism is the first and second directions with respect to the first direction. The display device according to claim 4, wherein the angle is larger than the second angle. The display device according to claim 1, wherein each of the first and second reflecting surfaces is a curved surface. The display device according to claim 1, wherein the first and second reflecting surfaces totally reflect the first and second light source lights from the light guide plate, respectively. All of the first light source light is incident on the first reflecting surface;
The display device according to claim 1, wherein all of the second light source light is incident on the second reflecting surface. An electronic device including a lighting device and a display device that includes a plurality of pixels and a display unit that performs video display using light from the lighting device,
The lighting device includes:
First and second light sources that can be individually lit;
A light guide plate that emits the first and second light source light respectively emitted from the first and second light sources at different angles from its emission surface;
A first reflecting surface for reflecting the first light source light from the light guide plate to the opposite side of the light guide plate; a second reflection surface of the second light source from the light guide plate to the opposite side of the light guide plate; An electronic device comprising: an optical member including a first reflecting surface and a second reflecting surface having a different shape. A lighting device for a display device,
First and second light sources that can be individually lit;
A light guide plate that emits the first and second light source light respectively emitted from the first and second light sources at different angles from its emission surface;
A first reflecting surface for reflecting the first light source light from the light guide plate to the opposite side of the light guide plate; a second reflection surface of the second light source from the light guide plate to the opposite side of the light guide plate; And an optical member including a second reflecting surface having a shape different from that of the first reflecting surface.

Images