JP2011076118A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display a three-dimensional image even when the long axis of a screen is faced in a horizontal direction or even when the minor axis of the screen is faced in the horizontal direction, and to display the three-dimensional image with high resolution. <P>SOLUTION: A display device includes a display unit comprising: a liquid crystal display panel 1; and a surface light source 15 for selectively emitting first, second, third and fourth illumination light. When the display unit is rotated so that the long axis (x) of the screen is faced to the horizontal direction, first left-eye image data and right-eye image data of images, deviated from each other in the direction of the long axis (x) of the screen, are selectively written into the liquid crystal display panel 1, and in synchronism with the writing operation, the first illumination light and the second illumination light are selectively emitted from the surface light source 15. When the display unit is rotated so that the minor axis (y) of the screen is faced in the horizontal direction, second left-eye image data and right-eye image data, for displaying a left-eye image and a right-eye image deviated from each other in a direction of the minor axis (y) of the screen are selectively written into the liquid crystal display panel 1, and in synchronism with the writing operation, the third illumination light and the fourth illumination light are selectively emitted from the surface light source 15. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a liquid crystal display device that displays a stereoscopic image.

  Conventionally, as a liquid crystal display device that displays a stereoscopic image, a left-eye image is shifted in the left-right direction with respect to the left-eye image by the other pixels in the other row, and the left-eye image is shifted by the other pixels in the other row. The right-eye image is displayed, and the left-eye image and the right-eye image are displayed with light emitted from every other pixel of the liquid crystal display panel and light emitted from every other pixel of the liquid crystal display panel. There is a lens that allows the left and right eyes of the observer to observe through a lenticular lens or a parallax barrier that distributes the left and right eyes of the observer (see Patent Documents 1, 2, and 3). .

Japanese Laid-Open Patent Publication No. 3-19889 Japanese Patent Laid-Open No. 7-005455 Japanese Patent Laid-Open No. 10-268230

  However, the conventional liquid crystal display device that displays a stereoscopic image displays the image for the left eye by every other row of pixels of the liquid crystal display panel, and displays the image for the right eye by every other row of pixels. The resolution of both the left-eye image and the right-eye image is low, and a high-quality stereoscopic image cannot be displayed.

  In addition, the conventional liquid crystal display device uses the lenticular lens or the parallax barrier to radiate the light emitted from every other row of pixels of the liquid crystal display panel and the light emitted from every other row of pixels. Therefore, the stereoscopic image can be displayed only in the state where the major axis direction of the screen (direction orthogonal to the pixel column) is directed in the left-right direction.

  The present invention can display a high-quality stereoscopic image with a high resolution of both the left-eye image and the right-eye image, and even when the long axis of the screen is directed in the left-right direction, An object of the present invention is to provide a liquid crystal display device capable of displaying a stereoscopic image even when the axis is directed in the left-right direction.

The liquid crystal display device of the present invention is
A liquid crystal display panel having a rectangular screen area in which a plurality of pixels for controlling light transmission are arranged in a matrix, image data is written in the plurality of pixels, and an image corresponding to the image data is displayed; Arranged on the opposite side of the liquid crystal display panel from the viewing side and projecting toward the screen region of the liquid crystal display panel in a direction inclined to one end side in the major axis direction of the screen with respect to the normal line of the screen. A first illumination light having directivity in which a peak of emission intensity exists and a second illumination light having directivity in which a peak of emission light intensity exists in a direction inclined toward the other end side in the major axis direction; A third illumination light having a directivity in which a peak of emitted light intensity exists in a direction inclined toward one end side in the minor axis direction of the screen and an emitted light intensity in a direction inclined toward the other end side in the minor axis direction. Selectively emit fourth illumination light with directivity with peaks. A surface light source that maintains a relative position between the liquid crystal display panel and the surface light source, with the long axis of the screen directed in the left-right direction and the short axis of the screen directed in the left-right direction. A rotating display unit;
When the display unit is rotated in a state in which the long axis of the screen is directed in the left-right direction, a left-eye image and a right image that are shifted from each other in the long-axis direction of the screen The first left-eye image data and the right-eye image data for displaying the ophthalmic image are selectively written, and the surface light source is synchronized with the writing of the first left-eye image data. , Out of the first and second illumination light, emitting illumination light having directivity in which a peak of emitted light intensity exists in a direction inclined leftward when viewed from the observation side of the liquid crystal display panel, In synchronization with the writing of the first right-eye image data, the output light intensity peak from the surface light source in the direction inclined to the right as viewed from the observation side, among the first and second illumination lights. The display unit emits illumination light having directivity in the presence of When the short axis of the screen is rotated in the left-right direction, the left-eye image and the right-eye image shifted from each other in the short-axis direction of the screen are displayed on the plurality of pixels of the liquid crystal display panel. The second left-eye image data and the right-eye image data to be displayed are selectively written, synchronized with the writing of the second left-eye image data, from the surface light source, the third and Of the fourth illumination light, the illumination light having the directivity in which the peak of the emitted light intensity exists in the direction inclined to the left as viewed from the observation side is emitted, and the second right-eye image data Synchronized with writing, illumination having directivity in which the peak of the emitted light intensity exists in the direction inclined to the right as viewed from the observation side from the surface light source from the surface light source. And a control means for emitting light.

  In the liquid crystal display device according to the present invention, the surface light source has a shape corresponding to a screen area of the liquid crystal display panel, and light incident portions are formed on four sides corresponding to the sides of the screen, respectively. Among the incident portions, the first illumination light is emitted while changing the direction of light incident from one incident portion of two short sides along the short axis direction of the screen, and incident from the incident portion on the other short side. The second illumination light is emitted by changing the direction of the emitted light, and the third illumination light is changed by changing the direction of the light incident from one incident portion of two long sides along the major axis direction of the screen. A diverting unit that emits the fourth illumination light by changing the direction of light emitted from the incident unit on the other long side, and is arranged to face the incident units on the four sides of the diverting unit. It is desirable that the first to fourth light source units are selectively turned on.

  In that case, the direction changing means is formed with an emission surface for emitting light on a surface facing the liquid crystal display panel, and two bottom sides along the major axis direction of the screen of the liquid crystal display panel on the opposite surface. And a prism sheet in which a plurality of quadrangular pyramid prisms having two bases along the minor axis direction of the screen are arranged in the major axis direction and the minor axis direction of the screen, and prism formation of the prism sheet It is preferable that the reflecting plate is disposed so as to face the surface, and an incident portion is formed between each of the two short sides and the two long sides of the prism sheet and the reflecting plate.

  Further, in the liquid crystal display device of the present invention, the first to fourth light source portions of the surface light source are each a plurality arranged at predetermined intervals along the length direction of each incident portion of the turning means. It is desirable that the solid-state light-emitting element and a diffusing member for diffusing the emitted light from the plurality of solid-state light-emitting elements in the length direction of the incident portion to be incident on the turning means.

  The liquid crystal display device of the present invention is disposed on the opposite side of the liquid crystal display panel from the observation side of the liquid crystal display panel having a rectangular screen region in which a plurality of pixels for controlling the transmission of light are arranged in a matrix, A first illumination having directivity in which a peak of emitted light intensity exists in a direction inclined toward one end side in the major axis direction of the screen with respect to a normal line of the screen toward the screen region of the liquid crystal display panel. Light and a second illumination light having directivity in which a peak of emitted light intensity exists in a direction inclined to the other end side in the major axis direction and an emitted light in a direction inclined to one end side in the minor axis direction of the screen A third illuminating light having directivity in which an intensity peak exists and a fourth illuminating light having directivity in which a peak of emitted light intensity exists in a direction inclined to the other end side in the minor axis direction. A display unit comprising a surface light source that selectively emits the liquid crystal display. By keeping the relative position of the panel and the surface light source and turning the screen in the state where the long axis of the screen is directed in the left-right direction and the state where the short axis of the screen is directed in the left-right direction, the screen is horizontally long. However, it can be used even if it is vertically long.

  Then, when the display unit is rotated to a state where the screen is horizontally long (a state where the long axis of the screen is directed in the left-right direction), the liquid crystal display device includes a plurality of pixels on the liquid crystal display panel. The first left-eye image data and the right-eye image data for displaying the left-eye image and the right-eye image shifted from each other in the major axis direction of the screen are selectively written, and the first left-eye image data is selectively written. Synchronously with the writing of the image data for the eye, the left and right illumination light from the surface light source as viewed from the viewing side of the liquid crystal display panel, that is, the left eye direction of the display observer Illumination light having directivity in which a peak of emitted light intensity exists in an inclined direction is emitted, and the first and second light sources are synchronized with writing of the first right-eye image data from the surface light source. Of the illumination light in the right direction when viewed from the observation side, that is, the display observer's Corresponding to the first left-eye image data and the right-eye image data on the liquid crystal display panel by emitting illumination light having directivity in which the peak of the emitted light intensity exists in a direction inclined to the eye direction The left-eye image and the right-eye image are sequentially displayed, and the display observer is made to observe the stereoscopic image.

  In addition, when the display unit is rotated to a state in which the screen is vertically long (a state in which the short axis of the screen is directed in the left-right direction), the liquid crystal display device includes a plurality of pixels on the liquid crystal display panel. Second left-eye image data and right-eye image data for displaying a left-eye image and a right-eye image shifted from each other in the minor axis direction of the screen are selectively written, and the second left-eye image data is selectively written. In synchronization with the writing of the image data for the eye, from the surface light source, the third and fourth illumination lights in the left direction as viewed from the viewing side of the liquid crystal display panel, that is, in the left eye direction of the display observer Illumination light having directivity in which a peak of emitted light intensity exists in an inclined direction is emitted, and the third and fourth light sources are synchronized with the writing of the second right-eye image data from the surface light source. Of the illumination light in the right direction when viewed from the observation side, that is, to the right of the display observer By emitting illumination light having directivity in which a peak of emitted light intensity exists in a direction inclined to the direction, the liquid crystal display panel corresponds to the first left-eye image data and right-eye image data. The left-eye image and the right-eye image are sequentially displayed, and the display observer is made to observe the stereoscopic image.

  In this liquid crystal display device, the writing of left-eye image data to a plurality of pixels of the liquid crystal display panel and the direction in which the peak of the emitted light intensity exists in the direction tilted toward the left eye of the display observer from the surface light source. Display of an image for the left eye by emission of illumination light having a characteristic, writing of image data for the right eye to a plurality of pixels of the liquid crystal display panel, and tilting toward the right eye of the display observer from the surface light source Display the image for the right eye by emitting the directional illumination light having a peak of the emitted light intensity in the direction in which the left eye image and the right eye image are respectively displayed. All the pixels of the liquid crystal display panel can be used for display, and therefore a high-quality stereoscopic image with high resolution of both the left-eye image and the right-eye image can be displayed.

  In addition, when the display unit is rotated in a state in which the screen is horizontally long, the liquid crystal display device has left-eye images that are shifted from each other in the major axis direction of the screen by the plurality of pixels of the liquid crystal display panel. The first left-eye image data and the right-eye image data for displaying the image and the right-eye image are selectively written, and in synchronization therewith, tilted from the surface light source toward the left eye of the display observer The first and second illumination lights having directivity in which the peak of the emitted light intensity is present in the direction inclined to the right eye direction and the direction inclined to the right eye direction are selectively emitted, and the display unit has a vertically elongated screen. A second left-eye image for displaying, on the plurality of pixels of the liquid crystal display panel, a left-eye image and a right-eye image that are shifted from each other in the minor axis direction of the screen. Data and right-eye image data are selectively written and synchronized with the data From the light source, the third and fourth illumination lights having directivity in which the peak of the emitted light intensity exists in the direction inclined to the left eye direction and the direction inclined to the right eye direction of the display observer are selectively emitted. Therefore, even when the long axis of the screen is directed in the left-right direction, the stereoscopic image can be displayed even when the short axis of the screen is directed in the left-right direction.

  In the liquid crystal display device according to the present invention, the surface light source has a shape corresponding to a screen area of the liquid crystal display panel, and light incident portions are formed on four sides corresponding to the sides of the screen, respectively. Among the incident portions, the first illumination light is emitted while changing the direction of light incident from one incident portion of two short sides along the short axis direction of the screen, and incident from the incident portion on the other short side. The second illumination light is emitted by changing the direction of the emitted light, and the third illumination light is changed by changing the direction of the light incident from one incident portion of two long sides along the major axis direction of the screen. A diverting unit that emits the fourth illumination light by changing the direction of light emitted from the incident unit on the other long side, and is arranged to face the incident units on the four sides of the diverting unit. It is desirable that the first to fourth light source units that are selectively lit are configured. By like, toward a screen area of the liquid crystal display panel, the first through fourth illumination light can be selectively emitted.

  In that case, the direction changing means is formed with an emission surface for emitting light on a surface facing the liquid crystal display panel, and two bottom sides along the major axis direction of the screen of the liquid crystal display panel on the opposite surface. And a prism sheet in which a plurality of quadrangular pyramid prisms having two bases along the minor axis direction of the screen are arranged in the major axis direction and the minor axis direction of the screen, and prism formation of the prism sheet It is preferable to form the incident portion between the two short sides and the two long sides of the prism sheet and the reflecting plate. By doing so, the light from the first to fourth light source sections is efficiently redirected to emit the first to fourth illumination lights with sufficient light intensity in the peak direction. Luminance left eye image and It is possible to display the eye image.

  Further, in the liquid crystal display device of the present invention, the first to fourth light source portions of the surface light source are each a plurality arranged at predetermined intervals along the length direction of each incident portion of the turning means. And a diffusion member that diffuses light emitted from the plurality of solid-state light-emitting elements in the length direction of the incident portion and enters the direction-changing means. Accordingly, the first to fourth illumination lights with uniform light intensity in the peak direction are emitted from the entire area of the redirecting means, and the liquid crystal display panel has good image quality for the left eye and the right eye without uneven brightness. An image can be displayed.

1 is a perspective view of a liquid crystal display device showing an embodiment of the present invention. FIG. 3 is a cross-sectional view of a part of a liquid crystal display panel of the liquid crystal display device. The disassembled perspective view of the surface light source of the said liquid crystal display device. Sectional drawing which abbreviate | omitted hatching along the longitudinal direction of a surface light source. The light intensity distribution figure of the 1st and 2nd illumination light radiate | emitted from the said surface light source. The perspective view of the use condition which made the screen which shows an example of the display apparatus provided with the said liquid crystal display device horizontally long. Sectional drawing which abbreviate | omitted hatching along the VII-VII line of FIG. The perspective view of the use condition which made the screen of the said display apparatus vertically long. Sectional drawing which abbreviate | omitted hatching along the IX-IX line of FIG.

  1 to 9 show an embodiment of the present invention, and FIG. 1 is a perspective view of a liquid crystal display device.

  As shown in FIG. 1, the liquid crystal display device has a rectangular screen region 1a in which a plurality of pixels (not shown) for controlling the transmission of light are arranged in a matrix, and image data is stored in the plurality of pixels. A liquid crystal display panel 1 that is written and displays an image according to the image data, and is disposed on the opposite side of the liquid crystal display panel 1 from the observation side (upper side in FIG. 1), and the screen area of the liquid crystal display panel 1 The display unit includes a surface light source 15 that emits illumination light toward 1a, and a control unit 23 that controls the display unit.

  FIG. 2 is a cross-sectional view of a part of the liquid crystal display panel 1. The liquid crystal display panel 1 is a pair of transparent substrates 2 and 3 joined via a frame-shaped sealing material 4 (see FIGS. 1 and 2). And transparent electrodes 5 and 6 that are provided on opposing inner surfaces of the substrates 2 and 3 to form a plurality of pixels arranged in a matrix by regions facing each other, and the pair of substrates 2 and 3 It consists of a nematic liquid crystal layer 9 provided in a region surrounded by the sealing material 4.

  The liquid crystal display panel 1 used in this embodiment has a row direction (in this embodiment, the length of a rectangular screen) on one of the pair of substrates 2 and 3, for example, the inner surface of the substrate 2 on the side opposite to the observation side. A plurality of pixel electrodes 5 arranged in a matrix in the column direction (direction along the short axis y of the rectangular screen) and the column direction (direction along the axis x) are provided, and the inner surface of the other substrate (observation side substrate) 3 is provided. An active matrix liquid crystal display panel provided with a single film-like counter electrode 6 facing the plurality of pixel electrodes 5, which is omitted in FIG. 2, but on the inner surface of the opposite substrate 2, the plurality of pixels A plurality of TFTs (thin film transistors) respectively connected to the electrodes 5, a plurality of gate wirings for supplying gate signals to the TFTs in each row, and a plurality of data wirings for supplying image data signals to the TFTs in each column are provided. .

  The liquid crystal display panel 1 is a bent alignment type liquid crystal display panel having high-speed response, or a homogeneous alignment type liquid crystal display panel in which the liquid crystal molecular alignment is achieved by reducing the liquid crystal layer thickness (substrate gap) to achieve high-speed response. In the case of a bent alignment type liquid crystal display panel, the liquid crystal molecules 9a of the liquid crystal layer 9 are pretilted by the horizontal alignment films 7 and 8 provided on the inner surfaces of the pair of substrates 2 and 3 so as to cover the electrodes 5 and 6. In the case of a homogeneous alignment type liquid crystal display panel, the liquid crystal molecules 9a of the liquid crystal layer 9 define the alignment direction by the horizontal alignment films 7 and 8, and the molecular major axis is in one direction. Are aligned homogeneously.

  A pair of polarizing plates 10 and 11 are arranged on the outer surfaces of the pair of substrates 2 and 3 of the liquid crystal display panel 1 with their transmission axes directed in a predetermined direction. A retardation film 12 for increasing display contrast is disposed between one of the substrates 2 and 3, for example, the substrate 3 on the observation side and the polarizing plate 11.

  In addition, the substrate 2 on the opposite side of the liquid crystal display panel 1 from the observation side is provided with one end edge in the row direction and one end edge in the column direction of the observation side substrate 3 as shown in FIGS. Driver mounting portions 2a and 2b projecting outward are formed, the plurality of gate wirings are connected to a gate-side driver 13 mounted on the driver mounting portion 2a in the row direction, and the plurality of data wirings are The counter electrode 6 is connected to the data side driver 14 mounted on the driver mounting portion 2b in the column direction, and the counter electrode 6 is one of the cross connection portion provided at the substrate bonding portion by the sealing material 4 and the driver mounting portions 2a and 2b. Alternatively, it is connected to the reference potential of one or both of the gate side driver 13 and the data side driver 14 through the counter electrode connection wiring formed on both sides.

  3 and 4 are an exploded perspective view of the surface light source 15 disposed on the side opposite to the observation side of the liquid crystal display panel 1 and a cross-sectional view in which hatching along the longitudinal direction thereof is omitted. The liquid crystal display panel 1 has a rectangular shape corresponding to the screen area 1a, and light incident portions 19 are formed on four sides corresponding to the respective sides of the screen. The direction of light incident from one incident portion 19 of two short sides along the short axis y direction of the screen is changed, and tilted toward one end side in the long axis x direction of the screen with respect to the normal H of the screen The first illumination light having directivity in which the peak of the emitted light intensity exists in the direction is emitted, the direction of the light incident from the incident portion 19 on the other short side is changed, and the normal line H of the screen is changed. The peak of the emitted light intensity is in the direction inclined to the other end side in the major axis x direction of the screen. The second illumination light having the existing directivity is emitted, the direction of the light incident from one incident portion 19 of two long sides along the major axis x direction of the screen is changed, and the normal line of the screen A third illuminating light having a directivity in which a peak of the emitted light intensity exists in a direction inclined toward one end side in the short axis y direction of the screen with respect to H is emitted from the incident portion 19 on the other long side. By changing the direction of the incident light, a fourth directivity having a peak of the emitted light intensity exists in a direction inclined to the other end side in the minor axis y direction of the screen with respect to the normal H of the screen. The first to fourth light source parts 20a, 20b, which are arranged to face each of the four-side incident parts 19 of the turning means 16 and are selectively turned on. 20c, 20d.

  The diverting means 16 of the surface light source 15 has an emission surface 17a for emitting light on a surface facing the liquid crystal display panel 1, and a major axis x of the screen of the liquid crystal display panel 1 on the opposite surface. A plurality of quadrangular pyramid prisms 17b having two bases along the direction and two bases along the short axis y direction of the screen are arranged in the long axis x direction and the short axis y direction of the screen. The prism sheet 17 and the reflector plate 18 arranged to face the prism forming surface of the prism sheet 17, the two short sides and two long sides of the prism sheet 17, and the reflector plate 18. In between, the incident part 19 is formed, respectively.

  In addition, each prism 17b of the prism sheet 17 is formed in a regular quadrangular pyramid shape in which the inclination angles of the four inclined surfaces are equal, and the inclination angle of each inclined surface with respect to the normal line H of the screen is 30 ° to 50 °. It is set in the range of °.

  Further, the first to fourth light source parts 20a, 20b, 20c, and 20d of the surface light source 15 are respectively arranged at predetermined intervals along the length direction of each incident part 19 of the turning means 16. And a diffusion member 22 for diffusing light emitted from the plurality of solid state light emitting elements 21 in the length direction of the incident portion 19 and entering the direction changing means 16.

  Although the structure of the solid-state light emitting element 21 is not illustrated, an LED (light emitting diode) is molded with a transparent resin, and the emission surface thereof is disposed to face the diffusion member 22.

  The diffusing member 22 has a length over the entire length of each incident portion 19 of the deflecting means 16, and the surface of the diffusing member 22 that faces the plurality of solid light emitting elements 21 emits light emitted from these solid light emitting elements 21. An angle at which an incident surface is formed and an exit surface for diffusing and emitting light incident from the incident surface in the length direction of the incident portion 19 is formed on the opposite surface (the surface facing the deflecting means 16). The exit surface of the diffusing member 22 is a diffusing surface that has been roughened, or a diffusing surface in which a diffusing lens portion is formed in a portion corresponding to each of the plurality of solid-state light emitting elements 21. Yes.

  The surface light source 15 selects the first to fourth illumination lights toward the screen area 1a of the liquid crystal display panel 1 by selectively lighting the first to fourth light source units 20a, 20b, 20c, and 20d. The light is emitted.

  That is, the surface light source 15 emits from the first light source unit 20a disposed to face one incident unit 19 of two short sides along the minor axis y direction of the screen of the liquid crystal display panel 1, The light incident on the deflecting means 16 composed of the prism sheet 17 and the reflecting plate 18 is refracted in the direction indicated by the arrow in FIG. The peak of the emitted light intensity from the exit surface 17a toward the one end side in the major axis x direction of the screen relative to the normal line H of the screen, that is, the direction opposite to the side where the first light source unit 20a is disposed. The first illuminating light having directivity is emitted, and is emitted from the second light source unit 20b disposed so as to be opposed to the incident unit 19 on the other short side and is incident on the deflecting unit 16. The light is transmitted through each of the four prism sheets 17. Refracted in the direction indicated by the broken line in FIG. 4 by the conical prism 17b, and from the exit surface 17a of the prism sheet 17 to the other end side in the major axis x direction of the screen with respect to the normal H of the screen, That is, the second illumination light having the directivity in which the peak of the emitted light intensity exists in the direction inclined to the side opposite to the arrangement side of the second light source unit 20b is emitted.

  Similarly, the surface light source 15 emits from a third light source unit 20c arranged to face one incident unit 19 on two short sides along the major axis x direction of the screen of the liquid crystal display panel 1. The light incident on the deflecting means 16 is refracted by the respective pyramidal prisms 17b of the prism sheet 17, and from the exit surface 17a of the prism sheet 17, the short axis of the screen with respect to the normal H of the screen. The third illumination light having a directivity in which the peak of the emitted light intensity exists in one direction in the y direction, that is, the direction inclined to the side opposite to the arrangement side of the third light source unit 20c, is emitted. The light emitted from the fourth light source unit 20d disposed so as to face the long-side incident unit 19 and incident on the deflecting unit 16 is refracted by each square pyramid prism 17b of the prism sheet 17, and Outgoing surface of prism sheet 17 From 7a, the peak of the emitted light intensity is in the direction inclined to the other end side in the short axis y direction of the screen with respect to the normal line H of the screen, that is, the side opposite to the arrangement side of the fourth light source unit 20d. The fourth illumination light having the existing directivity is emitted.

  The peak directions of the light intensities of the first to fourth illumination lights are directions inclined at an angle θ corresponding to the inclination angle of each inclined surface of the quadrangular pyramid prism 17b with respect to the normal H of the screen. is there.

  FIG. 5 shows light intensity distributions of the first and second illumination lights. In FIG. 5, the positive angle is an inclination angle in the direction opposite to the arrangement side of the first light source unit 20 a with respect to the normal line H of the screen, and the negative angle is the second light source unit with respect to the normal line H of the screen. The inclination angle is in the direction opposite to the arrangement side of 20b, and in this embodiment, there is a directivity in which the peak of the emitted light intensity exists in a direction inclined by 4 ° to 6 ° with respect to the normal line H of the screen. The inclination angle of the inclined surface of the quadrangular pyramid prism 17b is set so that the first and second illumination lights are emitted.

  Although the light intensity distributions of the third and fourth illumination lights are not shown in the figure, each prism 17b of the prism sheet 17 is formed in a regular quadrangular pyramid shape having the same inclination angles of the four inclined surfaces. The light intensity distributions of the third and fourth illumination lights are practically the same as the light intensity distributions of the first and second illumination lights.

  A display unit comprising the liquid crystal display panel 1 and the surface light source 15 disposed on the opposite side of the viewing side maintains the relative position between the liquid crystal display panel 1 and the surface light source 15, and the liquid crystal display panel 1. The screen is rotated between a state in which the long axis x of the screen is directed in the left-right direction and a state in which the short axis y of the screen is directed in the left-right direction.

  The control unit 23 for controlling the display unit is not specifically shown in its configuration, but includes a writing control circuit for controlling the gate side driver 13 and the data side driver 14 of the liquid crystal display panel 1 and the surface light source 15. The first to fourth light source units 20a, 20b, 20c, and 20d include a light source unit driving circuit that lights the solid state light emitting elements 21.

  When the display unit is rotated in a state where the long axis x of the screen is directed in the left-right direction, that is, in a state where the screen is horizontally long, a plurality of pixels of the liquid crystal display panel 1 are The first left-eye image data and the right-eye image data for displaying the left-eye image and the right-eye image that are shifted from each other in the major axis x direction of the screen are selectively written, and the first In synchronization with the writing of the left eye image data, the surface light source 15 emits the first and second illumination lights in a direction inclined to the left as viewed from the observation side of the liquid crystal display panel 1. Illumination light having directivity in which a peak of emission intensity exists is emitted, and the first and second illumination lights are emitted from the surface light source 15 in synchronization with the writing of the first right-eye image data. Outgoing light intensity peak in a direction inclined to the right as seen from the observation side The liquid crystal display panel is configured to emit existing illumination light having directivity and when the display unit is rotated in a state where the short axis y of the screen is directed in the left-right direction, that is, in a state where the screen is vertically long. Second left-eye image data and right-eye image data for displaying a left-eye image and a right-eye image shifted in the short axis y direction of the screen on a plurality of pixels In a direction inclined in the left direction when viewed from the observation side, out of the third and fourth illumination lights, from the surface light source 15 in synchronization with the writing of the second left-eye image data. Illuminating light having directivity in which the peak of the emitted light intensity exists is emitted, and the third and fourth illuminations are emitted from the surface light source 15 in synchronization with the writing of the second right-eye image data. Of the light, the peak of the emitted light intensity is inclined in the right direction when viewed from the observation side. It is configured to emit illumination light having a directivity click is present.

  FIGS. 6 to 9 show an example of a display device provided with the liquid crystal display device. FIGS. 6 and 8 are perspective views of the display device in a state where the screen is used horizontally and a state where the screen is used vertically. 7 is a sectional view in which hatching along the line VII-VII in FIG. 6 is omitted, and FIG. 9 is a sectional view in which hatching along the line IX-IX in FIG. 8 is omitted.

  In this display device, a rectangular display unit 26 having the liquid crystal display device is provided on a stand 24 for placing on a floor or a table via a support shaft 25, as shown in FIG. In a horizontally long screen state facing the left and right direction and a vertically long screen state where the short axis y of the screen is directed in the left and right direction as shown in FIG. 8, and the liquid crystal display device In the case 27 of the display unit 26, the surface on the observation side of the liquid crystal display panel 1 is disposed so as to face the display window 27 a provided on the front surface of the case 27.

  In this display device, when the display unit 26 is used with the screen in a landscape orientation, the arrangement side of the first light source unit 20a of the surface light source 15 is from the observation side of the liquid crystal display panel 1 as shown in FIG. When the second light source unit 20b is placed on the right side when viewed from the observation side and turned leftward when viewed from the observation side, the first light source 15 of the surface light source 15 is used as shown in FIG. The light source unit 20a is rotated to a horizontally long screen state in which the arrangement side of the liquid crystal display panel 1 is positioned on the right side when viewed from the observation side and the arrangement side of the second light source unit 20b is positioned on the left side when viewed from the observation side.

  Then, the control means 23 of the liquid crystal display device synchronizes with the writing of the first left-eye image data to the liquid crystal display panel 1 when the display unit 26 is rotated to the horizontally long screen state. When the solid state light emitting element 21 of the first light source 20a on the right side as viewed from the observation side of the surface light source 15 is turned on, the surface light source 15 is viewed from the observation side as indicated by an arrow in FIG. The surface light source 15 is emitted in synchronism with the writing of the first right-eye image data by emitting first illumination light having directivity in which a peak of the emitted light intensity exists in a direction inclined to the left. When the solid state light emitting device 21 of the second light source 20b on the right side as viewed from the observation side is turned on, the surface light source 15 tilts in the right direction as viewed from the observation side as indicated by a broken line in FIG. The peak of the emitted light intensity exists in the direction inclined in the direction inclined The second left-eye image data is written to the liquid crystal display panel 1 when the second illumination light having a directivity is emitted and the display unit 26 is rotated to the vertically long screen state. As shown in FIG. 9 by the solid light emitting element 21 of the third light source unit 20c on the right side as viewed from the observation side of the surface light source 15, the observation from the surface light source 15 as indicated by an arrow line in FIG. A third illumination light having a directivity in which a peak of the emitted light intensity exists in a direction inclined leftward when viewed from the side, and is synchronized with the writing of the second right-eye image data, When the solid state light emitting element 21 of the fourth light source 20d on the right side as viewed from the observation side of the surface light source 15 is turned on, the right side as viewed from the observation side as shown by the broken line in FIG. A fourth directivity having a peak of emitted light intensity in a direction inclined to the direction. It emits a bright light.

  That is, the liquid crystal display device includes a liquid crystal display panel 1 having a rectangular screen region 1a in which a plurality of pixels for controlling the transmission of light are arranged in a matrix, and a side opposite to the observation side of the liquid crystal display panel 1 The directivity in which the peak of the emitted light intensity exists in a direction inclined toward one end side in the major axis x direction of the screen with respect to the normal line H of the screen toward the screen region 1a of the liquid crystal display panel 1 And the second illumination light having directivity in which the peak of the emitted light intensity exists in the direction inclined to the other end side in the major axis x direction and the minor axis y direction of the screen. Third illumination light having directivity in which a peak of outgoing light intensity exists in a direction inclined toward one end side and directivity in which a peak of outgoing light intensity exists in a direction inclined toward the other end side in the short axis y direction The surface light source 15 that selectively emits the fourth illumination light having The display unit in which the liquid crystal display panel 1 and the surface light source 15 are maintained at a relative position with the long axis x of the screen directed in the left-right direction, and the short axis y of the screen directed in the left-right direction. The screen can be used regardless of whether the screen is horizontally long or vertically long.

  When the display unit is rotated to a state in which the screen is horizontally long (a state in which the long axis x of the screen is directed in the left-right direction), the liquid crystal display device has a plurality of pixels on the liquid crystal display panel 1. , Selectively writing first left-eye image data and right-eye image data for displaying a left-eye image and a right-eye image that are shifted from each other in the major axis x direction of the screen; In synchronization with the writing of the left-eye image data, the left light of the first and second illumination lights from the surface light source 15 as viewed from the observation side of the liquid crystal display panel 1, that is, the display observer The left-eye illumination light having a directivity in which the peak of the emitted light intensity exists in a direction inclined to the left-eye direction, and the surface light source is synchronized with the writing of the first right-eye image data 15 to the right of the first and second illumination lights as viewed from the observation side That is, by emitting right-eye illumination light having directivity in which a peak of emitted light intensity exists in a direction inclined to the right eye direction of the display observer, the liquid crystal display panel 1 is caused to emit the first left eye. The left-eye image and the right-eye image corresponding to the image data for the right eye and the image data for the right eye are sequentially displayed to allow the display observer to observe the stereoscopic image.

  In addition, when the display unit is rotated to a state in which the screen is vertically long (a state in which the short axis y of the screen is directed in the left-right direction), a plurality of pixels of the liquid crystal display panel 1 are provided. , Selectively writing second left-eye image data and right-eye image data for displaying a left-eye image and a right-eye image that are shifted from each other in the minor axis y direction of the screen, 2 in synchronism with the writing of the left-eye image data, out of the third and fourth illumination lights from the surface light source 15 as viewed from the viewing side of the liquid crystal display panel 1, that is, a display observer The surface light source emits left-eye illumination light having directivity in which the peak of the emitted light intensity exists in a direction inclined to the left-eye direction, and is synchronized with the writing of the second right-eye image data. 15 from among the third and fourth illumination lights as viewed from the observation side That is, by emitting the right-eye illumination light having directivity in which the peak of the emitted light intensity exists in the direction inclined to the right eye direction of the display observer, the liquid crystal display panel 1 is caused to emit the first left-eye light. The image data and the image for the left eye corresponding to the image data for the right eye and the image for the right eye are sequentially displayed to allow the display observer to observe the stereoscopic image.

  The liquid crystal display device of this embodiment displays a stereoscopic color image by field sequential display, and the solid-state light emitting elements 21 of the first to fourth light source units 20a, 20b, 20c, and 20d of the surface light source 15 are used. Each has a red LED that emits red light, a green LED that emits green light, and a blue LED that emits blue light, and these three colors of LEDs are selectively driven to turn on red, green, and blue The three colors of light are selectively emitted.

  The control means 23 displays one stereoscopic color image both when the display unit is rotated in a state where the screen is horizontally long and when the display unit is rotated in a state where the screen is vertically long. For each of six fields obtained by dividing one frame for display into six fields, one of the left eye image data and the right eye image data of unit colors of red, green, and blue is arranged in an arbitrary order. Are sequentially written to each pixel of the liquid crystal display panel 1 and synchronized with the writing of the image data for the left eye of each unit color of red, green and blue, and the illumination for the left eye of the color of the written image data Light is emitted from the surface light source 15 and synchronized with the writing of the right-eye image data of each unit color of red, green, and blue, and the illumination light for the right eye of the color of the written image data is supplied to the surface light source 15. Configured to emit from

  In the liquid crystal display device, writing of left-eye image data to a plurality of pixels of the liquid crystal display panel 1 and a peak of emitted light intensity in a direction inclined from the surface light source 15 toward the left eye of the display observer exists. Display of left-eye images by emitting left-eye illumination light having directivity, writing of right-eye image data to a plurality of pixels of the liquid crystal display panel 1, and display observation from the surface light source 15 Since the right eye image is sequentially displayed by emitting right eye illumination light having directivity in which the peak of the emitted light intensity exists in a direction inclined to the right eye direction of the person, the left eye Images for the right eye and images for the right eye can be displayed using all the pixels of the liquid crystal display panel, respectively, and thus a high-quality stereoscopic image with high resolution of both the left eye image and the right eye image Can be displayed.

  In addition, when the display unit is rotated in a state where the screen is horizontally long, the liquid crystal display device has a plurality of pixels of the liquid crystal display panel 1 that are shifted from each other in the long axis x direction of the screen. The first left-eye image data and the right-eye image data for displaying the image for use and the image for the right eye are selectively written and synchronized with the left-eye of the display observer from the surface light source 15. First and second illumination lights (left-eye illumination light and right-eye illumination light) having directivity in which peaks of emitted light intensity exist in directions inclined in the direction and in a direction inclined in the right-eye direction. When the display unit is selectively emitted and rotated to a state in which the screen is vertically long, the left-eye image is shifted from the plurality of pixels of the liquid crystal display panel 1 in the short axis y direction of the screen. Second left-eye image data and right-eye image data for displaying the right-eye image and the right-eye image And the directivity in which the peak of the emitted light intensity exists from the surface light source 15 in the direction inclined to the left eye direction of the display observer and the direction inclined to the right eye direction. Since the third and fourth illumination lights (left-eye illumination light and right-eye illumination light) are selectively emitted, even when the long axis of the screen is directed in the left-right direction, A stereoscopic image can be displayed even when the short axis of the screen is directed in the left-right direction.

  In the liquid crystal display device, the surface light source 15 has a shape corresponding to the screen region 1a of the liquid crystal display panel 1, and light incident portions 19 are formed on four sides corresponding to the sides of the screen. Of these incident portions 19, the first illumination light is emitted while changing the direction of light incident from one incident portion 19 of two short sides along the short axis y direction of the screen, and the other The direction of the light incident from the short side incident part 19 is changed to emit the second illumination light, and the direction of the light incident from one of the two long side incident parts 19 along the major axis x direction of the screen Changing the direction of the light incident from the incident part 19 on the other long side and emitting the fourth illumination light by changing the direction of the incident light, and the direction changing means 16 The first side which is arranged to face each of the four side incident parts 19 and is selectively lit. Since the fourth light source unit 20a, 20b, 20c, 20d is configured, the first to fourth illumination lights can be selectively emitted toward the screen region 1a of the liquid crystal display panel 1. it can.

  And in the said Example, the output surface 17a which radiate | emits the said direction change means 16 in the surface facing the said liquid crystal display panel 1 is formed, and the screen of the said liquid crystal display panel 1 is formed in the opposite surface. A plurality of quadrangular pyramid prisms 17b having two bases along the major axis x direction and two bases along the minor axis y direction of the screen are arranged in the major axis x direction and the minor axis y direction of the screen. The prism sheet 17 is formed, and the reflector 18 disposed to face the prism forming surface of the prism sheet 17, and the two short sides and two long sides of the prism sheet 17 and the reflector Since the incident portions 19 are respectively formed between the light source 18 and the light source portions 18, the light from the first to fourth light source portions 20a, 20b, 20c, and 20d is efficiently redirected, and the light intensity in the peak direction is sufficient. First The optimum fourth illumination light emitted, high brightness left-eye image and the right eye image of the liquid crystal display panel 1 can be displayed.

  Further, in the liquid crystal display device of the above embodiment, the first to fourth light source parts 20a, 20b, 20c, and 20d of the surface light source 15 are arranged along the length direction of each incident part 19 of the turning means 16, respectively. In addition, a plurality of solid state light emitting elements 21 arranged at predetermined intervals and the emitted light from the plurality of solid state light emitting elements 21 are diffused in the length direction of the incident portion 19 and are incident on the direction changing means 16. Since the diffusing member 22 is used, the first to fourth illumination lights with uniform light intensity in the peak direction are emitted from the entire area of the redirecting means 16 and the liquid crystal display panel 1 has no uneven brightness. It is possible to display a left-eye image and a right-eye image with high image quality.

  In the liquid crystal display device of the above embodiment, the direction changing means 16 of the surface light source 15 is opposed to the prism sheet 17 on which a plurality of prismatic prisms 17b are formed and the prism forming surface of the prism sheet 17. The direction changing means 16 is composed of, for example, a rectangular transparent plate corresponding to the screen region 1a of the liquid crystal display panel 1, and corresponds to each side of the screen. An incident portion is formed on each of the end surfaces of the four sides, an exit surface is formed on the surface facing the liquid crystal display panel 1, and light incident on the opposite side of the light from the end surfaces of the four sides is entered into the transparent plate. A light guide plate or the like formed by arranging a plurality of prismatic prisms that are refracted and emitted from the exit surface in the major axis x direction and the minor axis y direction of the screen may be used.

  In the liquid crystal display device of the above embodiment, the first to fourth light source parts 20a, 20b, 20c, and 20d of the surface light source 15 are arranged along the length direction of each incident part 19 of the turning means 16. And a plurality of solid state light emitting elements 21 arranged at predetermined intervals, and a diffusion for diffusing emitted light from the plurality of solid state light emitting elements 21 in the length direction of the incident portion 19 and entering the direction changing means 16 A plurality of solid state light emitting elements 21 are arranged at close intervals along the length direction of each incident portion 19 of the diverting means 16. The diffusion member 22 may be omitted.

  Furthermore, the liquid crystal display device can display not only a stereoscopic color image but also a planar color image in a field sequential manner. In this case, red, green, and blue units for either the left or right eye are used. Color image data or red, green, and blue unit color image data captured by one imaging lens is sequentially written to each pixel of the liquid crystal display panel 1 and written in synchronization with the writing of the unit color image data. The illumination light for the left eye and the right eye corresponding to the unit color image data may be emitted from the surface light source 15 at the same time.

  The liquid crystal display device of the above embodiment displays a stereoscopic color image by field sequential display using the liquid crystal display panel 1 that does not include a color filter. However, the present invention provides a plurality of pixels corresponding to a plurality of pixels, respectively. Can be applied to a liquid crystal display device that displays a three-dimensional color image using a liquid crystal display panel having color filters of three colors such as red, green, and blue. In that case, red, green, blue The left-eye image data and the right-eye image data having the color information of the three colors are sequentially written in the respective pixels of the liquid crystal display panel 1, and are synchronized with the writing of the left-eye image data from the surface light source 15. The white left-eye illumination light may be emitted, and the white right-eye illumination light may be emitted in synchronization with the writing of the right-eye image data.

  The liquid crystal display panel 1 is not limited to a bent alignment type liquid crystal display panel or a homogeneous alignment type liquid crystal display panel, and may be a ferroelectric liquid crystal display panel, a TN (twisted nematic) type liquid crystal display panel, or the like.

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display panel, 1a ... Screen area | region, 15 ... Surface light source, 16 ... Diverting means, 17 ... Prism sheet, 17a ... Outgoing surface, 17b ... Square pyramid prism, 18 ... Reflector plate, 19 ... Incident part, 20a , 29b, 20c, 20d ... light source part, 21 ... solid state light emitting element, 22 ... diffusion member, 23 ... control means.

Claims (4)

A liquid crystal display panel having a rectangular screen area in which a plurality of pixels for controlling light transmission are arranged in a matrix, image data is written in the plurality of pixels, and an image corresponding to the image data is displayed; Arranged on the opposite side of the liquid crystal display panel from the viewing side and projecting toward the screen region of the liquid crystal display panel in a direction inclined to one end side in the major axis direction of the screen with respect to the normal line of the screen. A first illumination light having directivity in which a peak of emission intensity exists and a second illumination light having directivity in which a peak of emission light intensity exists in a direction inclined toward the other end side in the major axis direction; A third illumination light having a directivity in which a peak of emitted light intensity exists in a direction inclined toward one end side in the minor axis direction of the screen and an emitted light intensity in a direction inclined toward the other end side in the minor axis direction. Selectively emit fourth illumination light with directivity with peaks. A surface light source that maintains a relative position between the liquid crystal display panel and the surface light source, with the long axis of the screen directed in the left-right direction and the short axis of the screen directed in the left-right direction. A rotating display unit;
When the display unit is rotated in a state in which the long axis of the screen is directed in the left-right direction, a left-eye image and a right image that are shifted from each other in the long-axis direction of the screen The first left-eye image data and the right-eye image data for displaying the ophthalmic image are selectively written, and the surface light source is synchronized with the writing of the first left-eye image data. , Out of the first and second illumination light, emitting illumination light having directivity in which a peak of emitted light intensity exists in a direction inclined leftward when viewed from the observation side of the liquid crystal display panel, In synchronization with the writing of the first right-eye image data, the output light intensity peak from the surface light source in the direction inclined to the right as viewed from the observation side, among the first and second illumination lights. The display unit emits illumination light having directivity in the presence of When the short axis of the screen is rotated in the left-right direction, the left-eye image and the right-eye image shifted from each other in the short-axis direction of the screen are displayed on the plurality of pixels of the liquid crystal display panel. The second left-eye image data and the right-eye image data to be displayed are selectively written, synchronized with the writing of the second left-eye image data, from the surface light source, the third and Of the fourth illumination light, the illumination light having the directivity in which the peak of the emitted light intensity exists in the direction inclined to the left as viewed from the observation side is emitted, and the second right-eye image data Synchronized with writing, illumination having directivity in which the peak of the emitted light intensity exists in the direction inclined to the right as viewed from the observation side from the surface light source from the surface light source. A liquid crystal display device comprising control means for emitting light.   The surface light source has a shape corresponding to the screen area of the liquid crystal display panel, and light incident portions are respectively formed on four sides corresponding to the respective sides of the screen. Among these incident portions, the short axis of the screen is formed. The first illumination light is emitted by changing the direction of light incident from one incident part of two short sides along the direction, and the second illumination is changed by changing the direction of light incident from the incident part of the other short side. The light is emitted, the third illumination light is emitted while changing the direction of the light incident from one incident part of the two long sides along the long axis direction of the screen, and the light is incident from the other long side incident part. Direction changing means for changing the direction of the light to emit the fourth illumination light, and first to fourth light sources that are arranged to face each of the four side incident portions of the direction changing means and are selectively lit. The liquid crystal display device according to claim 1, comprising a light source unit.   The redirecting means is formed with an exit surface for emitting light on the surface facing the liquid crystal display panel, and on the opposite surface thereof, two bottom sides along the major axis direction of the screen of the liquid crystal display panel and the short side of the screen. A prism sheet formed by arranging a plurality of square pyramid prisms having two bases along the axial direction in the major axis direction and the minor axis direction of the screen, and opposed to the prism forming surface of the prism sheet. 3. The reflecting plate according to claim 2, further comprising an incident portion formed between the two short sides and the two long sides of the prism sheet and the reflecting plate. The liquid crystal display device described.   Each of the first to fourth light source parts of the surface light source includes a plurality of solid state light emitting elements arranged at predetermined intervals along the length direction of each incident part of the turning means, and the plurality of solid state light emitting elements. The liquid crystal display device according to claim 1, further comprising a diffusing member that diffuses light emitted from the light incident in a length direction of the incident portion and makes the light incident on the direction changing unit.

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