JP2006234916A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device with which a stereoscopic image with high resolution is displayed, and which is easily manufactured. <P>SOLUTION: In the liquid crystal display device, on the side opposite to the observer's side of a liquid crystal display panel 1 in which image data for the left eye and that for the right eye are selectively written, a surface light source 15 is disposed comprising a light guide plate 16 having an oblong and rectangular outline corresponding to a screen shape of the liquid crystal display panel 1 and emitting light to the liquid crystal display panel 1 side, and a light source portion 28 which selectively emits toward an incident surface 17 of the light guide plate 16: first light with directivity having a peak of light intensity in a direction inclined to either of the right-hand side and the left-hand side with respect to the vertical direction existing therein; and second light with directivity having a peak of light intensity in a direction inclined to the other side existing therein, and emitting the first light from the light source portion 28 as illumination light for the left eye, and the second light as that for the right eye. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

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

Conventionally, as a liquid crystal display device for displaying a stereoscopic image, an image for the left eye is displayed by every other column of pixels of the liquid crystal display panel, and an image for the right eye is displayed by every other column of pixels. And right-eye images are divided into the left-eye direction and the right-eye direction of the display observer for the light emitted from the pixels in one row and the light from the pixels in the other row of the liquid crystal display panel. Alternatively, the left and right eyes of the observer can be observed through a parallax barrier formed in stripes by alternately arranging a plurality of transmission parts and light-shielding parts parallel to the pixel rows of the liquid crystal display panel. (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, since a conventional liquid crystal display device that displays a stereoscopic image displays an image for the left eye by every other row of pixels of the liquid crystal display panel and an image for the right eye by every other row of pixels, The image resolution is low.

  In addition, the conventional liquid crystal display device includes a lenticular lens having a lens pitch corresponding to the pixel pitch of the liquid crystal display panel, or a parallax barrier having a transmissive part pitch corresponding to the pixel pitch, and each lens part or transmissive part is provided with Manufacture is difficult because the pixels in each row of the liquid crystal display panel must be arranged with high precision in a predetermined positional relationship.

  An object of the present invention is to provide a liquid crystal display device that can display a high-resolution stereoscopic image and can be easily manufactured.

The liquid crystal display device of the present invention is
It has a horizontally long rectangular screen area in which a plurality of pixels are arranged in a matrix, and left-eye image data and right-eye image data for observing with the left and right eyes are selectively selected in the plurality of pixels. A liquid crystal display panel that selectively displays a left-eye image and a right-eye image according to the left-eye and right-eye image data,
The liquid crystal display panel is disposed so as to face the surface opposite to the observation side, has a horizontally long rectangular outer shape corresponding to the screen shape of the liquid crystal display panel, and upper and lower edges of the screen of the liquid crystal display panel. An incident part for making light incident on at least one of the two substantially parallel long sides is formed, the direction of incident light incident from the incident part is changed, and the light is parallel to the normal line of the liquid crystal display panel. And the direction change means which radiate | emits to the said liquid crystal display panel side with the output angle according to the inclination angle to the left-right direction with respect to the said up-down direction with respect to the said up-down direction with respect to the surface along the up-down direction of the screen of the said liquid crystal display panel, The light intensity peak is arranged in a direction inclined to either the right or left when viewed from the liquid crystal display panel side with respect to the vertical direction toward the incident portion. No. with the existing directivity And a light source unit that selectively emits second light having directivity in which a light intensity peak exists in a direction inclined to the other side with respect to the vertical direction, and from the light source unit Direction in which one of the first and second lights is guided by the deflecting means and a peak of the emitted light intensity exists in a direction inclined in the direction of the left eye of the display observer with respect to the normal line of the liquid crystal display panel. The left-eye illumination light having a characteristic is emitted, the other of the first and second lights from the light source unit is guided by the turning means, and the display observation is performed with respect to the normal line of the liquid crystal display panel. A surface light source that emits illumination light for right eye having directivity in which a peak of emitted light intensity exists in a direction inclined to the right eye direction of the person,
The left-eye image data and right-eye image data are selectively written to a plurality of pixels of the liquid crystal display panel, and the left-eye illumination light is transmitted from the surface light source in synchronization with the writing of the left-eye image data. And control means for emitting the right-eye illumination light from the surface light source in synchronization with the writing of the left-eye image data.

  In the liquid crystal display device according to the present invention, the surface light source changing means includes two long side portions substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel, of the peripheral surface of the rectangular plate-shaped transparent member. At least one is provided with an incident surface for allowing light to enter into the transparent member, and an emission surface for emitting light is formed on a plate surface facing the liquid crystal display panel, out of the two plate surfaces of the transparent member, A light guide plate in which a reflection surface that reflects light incident from the incident surface toward the emission surface is formed on the opposite plate surface is desirable.

  Further, the surface light source changing means has a plurality of elongate surfaces along the left-right direction of the screen of the liquid crystal display panel on the surface opposite to the light emission surface formed on the surface facing the liquid crystal display panel. A rectangular prism sheet in which prisms are formed in parallel to each other, and a rectangular reflecting plate facing the prism forming surface of the prism sheet via a space, and a space between the prism sheet and the reflecting plate An incident portion that allows light to enter the space may be formed on at least one of two long sides substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel.

  In the liquid crystal display device according to the present invention, the light source section of the surface light source includes, for example, a plurality of solid state light emitting elements that emit light having directivity in which a light intensity peak exists in one direction, and the direction changing unit. The plurality of solid-state light-emitting elements are disposed outside the incident portion of the liquid crystal display panel, and the light emission direction of half of the first solid-state light-emitting elements is viewed from the liquid crystal display panel side with respect to the vertical direction of the screen of the liquid crystal display panel. It is desirable that the light emission direction of the other half of the second solid state light emitting elements be arranged in a direction inclined to the other side with respect to the vertical direction.

  In that case, an incident portion for allowing light to enter each of two long side portions substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel of the diverting means is formed, and on the outside of the one incident portion, Arranging the first solid state light emitting elements arranged in the length direction and arranging the second solid state light emitting elements arranged in the length direction outside the other incident part of the direction changing means, or The first solid-state light-emitting element and the second solid-state light-emitting element may be alternately arranged in the length direction outside the incident portion of the turning means.

  In the liquid crystal display device according to the present invention, the light source unit of the surface light source includes a plurality of condensing lens units arranged outside the incident unit of the diverting unit and arranged in the length direction of the incident unit. Of the light incident on the condensing lens part from the side opposite to the direction opposite to the deflecting means, the light incident on one of the left and right regions from the center of the condensing lens part is condensed and the liquid crystal The first light having directivity in which a peak of light intensity exists in a direction inclined to either the left or right when viewed from the liquid crystal display panel side with respect to the vertical direction of the screen of the display panel is incident on the direction changing means. A light beam having a directivity in which the light emitted toward the other portion and incident on the other region of the condenser lens portion is condensed and has a light intensity peak in a direction inclined to the other with respect to the vertical direction. Condensing lens array that emits the light 2 toward the incident part of the deflecting means The condensing lens array is disposed on the opposite side of the condensing lens array from the side facing the deflecting means so as to oppose the one region and the other region of the plurality of condensing lens portions. It is preferable that the lens unit includes a plurality of first and second solid state light emitting elements that emit light toward the one region and the other region of the lens unit.

  In this case, it is desirable that the plurality of condensing lens portions of the condensing lens array are formed of circular lenses in which the exit surface facing the deflecting means and the opposite entrance surface are formed on a cylindrical surface.

  In the plurality of condensing lens portions of the condensing lens array, an exit surface facing the direction changing unit is formed as an elliptical cylindrical surface, and an incident surface on the opposite side is substantially parallel to the incident unit of the direction changing unit. More preferably, it is composed of an elliptical lens formed on a straight surface.

  The liquid crystal display device according to the present invention selectively writes left-eye image data and right-eye image data to a plurality of pixels of the liquid-crystal display panel, and synchronizes with the writing of the left-eye image data. The right eye emits illuminating light for left eye having directivity in which a peak of emitted light intensity exists in a direction inclined to the left eye direction of the display observer with respect to the normal line of the liquid crystal display panel from the light source. In synchronism with the writing of the image data for use, the surface light source has a directivity in which a peak of emitted light intensity exists in a direction inclined to the right eye direction of the display observer with respect to the normal line of the liquid crystal display panel. By emitting the right eye illumination light, the liquid crystal display panel sequentially displays the left eye image corresponding to the left eye image data and the right eye image corresponding to the right eye image data, Make display observers observe stereoscopic images Those were.

  The liquid crystal display device includes a left-eye image display by writing left-eye image data to a plurality of pixels of the liquid crystal display panel and emitting left-eye illumination light from the surface light source, and the liquid crystal display panel. Since the right-eye image data is written in the plurality of pixels and the right-eye image is displayed by emitting the right-eye illumination light from the surface light source sequentially, the left-eye image and the right-eye image are displayed. An ophthalmic image can be displayed using all the pixels of the liquid crystal display panel, and thus a high-resolution stereoscopic image can be displayed.

  In addition, the liquid crystal display device has the surface light source on the side opposite to the observation side of the liquid crystal display panel, and the left eye illumination light and the right eye illumination light from the surface light source are displayed on the screen area of the liquid crystal display panel. Therefore, it can be easily manufactured.

  Further, the liquid crystal display device is arranged so that the surface light source faces the surface opposite to the observation side of the liquid crystal display panel having a horizontally long rectangular screen region, and corresponds to the screen shape of the liquid crystal display panel. An incident portion is formed to allow light to be incident on at least one of two long sides substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel. The incident portion is incident from the incident portion. The direction of the incident light is changed, and the light is parallel to the normal line of the liquid crystal display panel and the surface of the liquid crystal display panel extends along the vertical direction of the screen. A diverting unit that emits light toward the liquid crystal display panel at an emission angle corresponding to an inclination angle, and is disposed to face the incident portion of the diverting unit, and is directed toward the incident portion with respect to the vertical direction. Left when viewed from the LCD panel side The first light having a directivity in which a light intensity peak exists in a direction inclined to either one and the directivity in which a light intensity peak exists in a direction inclined to the other with respect to the vertical direction. A light source part that selectively emits the second light, and guides one of the first and second lights from the light source part by the turning means with respect to a normal line of the liquid crystal display panel. The 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 of the display observer is emitted, and the other of the first and second lights from the light source unit is emitted. Illuminating light for the right eye having directivity in which a peak of the emitted light intensity exists in a direction inclined to the right eye direction of the display observer with respect to the normal line of the liquid crystal display panel. Since the surface light source emits light from the surface light source, Light intensity over the entire downward is emitted uniformly left eye illuminating light and the right-eye illumination light, it is possible to display a high-quality three-dimensional image with no luminance unevenness on the liquid crystal display panel.

  In the liquid crystal display device according to the present invention, the surface light source changing means includes two long side portions substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel, of the peripheral surface of the rectangular plate-shaped transparent member. At least one is provided with an incident surface for allowing light to enter into the transparent member, and an emission surface for emitting light is formed on a plate surface facing the liquid crystal display panel, out of the two plate surfaces of the transparent member, A light guide plate in which a reflection surface that reflects light incident from the incident surface toward the exit surface is formed on the opposite plate surface is desirable, and in this way, the first and the light sources from the light source unit The second light is guided by the light guide plate, and the left-eye illumination light and the right-eye illumination light having uniform light intensity are emitted from the emission surface over the entire vertical direction of the screen of the liquid crystal display panel. High-quality 3D image without uneven brightness on the panel It can be displayed.

  Further, the surface light source changing means has a plurality of elongate surfaces along the left-right direction of the screen of the liquid crystal display panel on the surface opposite to the light emission surface formed on the surface facing the liquid crystal display panel. A rectangular prism sheet in which prisms are formed in parallel to each other, and a rectangular reflecting plate facing the prism forming surface of the prism sheet via a space, and a space between the prism sheet and the reflecting plate An incident portion for allowing light to enter the space may be formed on at least one of the two long side portions substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel. Thus, the first and second lights from the light source unit are guided by the reflecting plate and the prism sheet, and from the exit surface of the prism sheet to the entire area in the vertical direction of the screen of the liquid crystal display panel. Intensity is emitted uniformly left eye illuminating light and the right-eye illumination light, it is possible to display a high-quality three-dimensional image with no luminance unevenness on the liquid crystal display panel.

  In the liquid crystal display device according to the present invention, the light source section of the surface light source includes, for example, a plurality of solid state light emitting elements that emit light having directivity in which a light intensity peak exists in one direction, and the direction changing unit. The plurality of solid-state light-emitting elements are disposed outside the incident portion of the liquid crystal display panel, and the light emission direction of half of the first solid-state light-emitting elements is viewed from the liquid crystal display panel side with respect to the vertical direction of the screen of the liquid crystal display panel. It is desirable to arrange the light emission direction of the other half of the second solid state light emitting elements in the direction inclined to the other side with respect to the vertical direction. By doing so, the light from one of the first and second solid state light emitting elements is emitted as left eye illumination light by the diverting means, and the light from the other solid state light emitting element is emitted by the diverting means. Output as illumination light for right eye In both cases, the left-eye illumination light and the right-eye illumination light have the same intensity, and the liquid crystal display panel displays a high-quality stereoscopic image with a good luminance balance between the left-eye image and the right-eye image. it can.

  In that case, an incident portion for allowing light to enter each of two long side portions substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel of the diverting means is formed, and on the outside of the one incident portion, Arranging the first solid state light emitting elements arranged in the length direction and arranging the second solid state light emitting elements arranged in the length direction outside the other incident part of the direction changing means, or The first solid-state light-emitting element and the second solid-state light-emitting element may be alternately arranged in the length direction outside the incident portion of the diverting means, and in either case, the diverting means Left-eye illumination light and right-eye illumination light having the same light intensity can be emitted.

  In the liquid crystal display device according to the present invention, the light source unit of the surface light source includes a plurality of condensing lens units arranged outside the incident unit of the diverting unit and arranged in the length direction of the incident unit. Of the light incident on the condensing lens part from the side opposite to the direction opposite to the deflecting means, the light incident on one of the left and right regions from the center of the condensing lens part is condensed and the liquid crystal The first light having directivity in which a peak of light intensity exists in a direction inclined to either the left or right when viewed from the liquid crystal display panel side with respect to the vertical direction of the screen of the display panel is incident on the direction changing means. A light beam having a directivity in which the light emitted toward the other portion and incident on the other region of the condenser lens portion is condensed and has a light intensity peak in a direction inclined to the other with respect to the vertical direction. Condensing lens array that emits the light 2 toward the incident part of the deflecting means The condensing lens array is disposed on the opposite side of the condensing lens array from the side facing the deflecting means so as to oppose the one region and the other region of the plurality of condensing lens portions. Preferably, the lens unit includes a plurality of first and second solid state light emitting elements that emit light toward the one region and the other region of the lens unit. The light from the first and second solid-state light emitting elements is emitted in the vertical direction of the screen of the liquid crystal display panel by the condenser lens portion of the condenser lens array. The first light having directivity in which a light intensity peak exists in a direction inclined to either the left or right when viewed from the liquid crystal display panel side, is incident on the redirecting means, and is emitted from the other solid state light emitting device. The light from the condenser lens array Light is incident on the turning means as second light having directivity in which a light intensity peak exists in a direction inclined to the other side with respect to the vertical direction by the optical lens unit, and the left-eye illumination from the turning means Light and right-eye illumination light can be emitted.

  In that case, it is desirable that the plurality of condensing lens portions of the condensing lens array include a circular lens in which an exit surface facing the deflecting unit and an incident surface on the opposite side are formed on a cylindrical surface. In this way, the light from the first and second solid state light emitting elements is incident on the direction changing means as the first and second light having the directivity and the same intensity, and the direction changing The left-eye illumination light and the right-eye illumination light having sufficient directivity and equal intensity are emitted from the means, and the liquid crystal display panel has a good luminance balance between the left-eye image and the right-eye image. A high-quality stereoscopic image can be displayed.

  In the plurality of condensing lens portions of the condensing lens array, an exit surface facing the direction changing unit is formed as an elliptical cylindrical surface, and an incident surface on the opposite side is substantially parallel to the incident unit of the direction changing unit. It is more preferable that the lens is formed of an elliptic lens formed on a straight surface. By doing so, the light from the first and second solid state light emitting devices is equal in intensity with high directivity. The first light and the second light are incident on the deflecting means, and left eye illumination light and right eye illumination light having high directivity and equal intensity are emitted from the redirecting means, and the liquid crystal is emitted. A higher-quality stereoscopic image can be displayed on the display panel.

(First embodiment)
1 to 7 show a first embodiment of the present invention. FIG. 1 is an exploded perspective view of a liquid crystal display device, and FIG. 2 is a view as seen from the upper side of the liquid crystal display device.

  As shown in FIGS. 1 and 2, the liquid crystal display device has a horizontally long rectangular screen region 1a in which a plurality of pixels (not shown) are arranged in a matrix. Left-eye and right-eye image data for observation with the eye is selectively written, and a left-eye image and a right-eye image are selected according to the left-eye and right-eye image data. A liquid crystal display panel 1 for display, a surface light source 15 disposed on the opposite side of the observation side (lower side in FIG. 2) of the liquid crystal display panel 1, and a control means 35 for controlling the display of the liquid crystal display device; It has.

  FIG. 3 is a cross-sectional view of a part of the liquid crystal display panel 1. The liquid crystal display panel 1 has a pair of transparent substrates 2 and 3 joined together 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 (horizontal direction of the screen) and a column direction (on the inner surface of the substrate 2 on the side opposite to the observation side), for example, on one side of the pair of substrates 2 and 3. An active matrix in which a plurality of pixel electrodes 5 arranged in a matrix are provided in the vertical direction of the screen, and a single film-like counter electrode 6 facing the plurality of pixel electrodes 5 is provided on the inner surface of the other observation side substrate 3. Although not shown in FIG. 3, the liquid crystal display panel has a plurality of TFTs (thin film transistors) connected to the plurality of pixel electrodes 5 on the inner surface of the opposite substrate 2 and gate signals to the TFTs in each row. A plurality of gate wirings to be supplied and a plurality of data wirings to supply 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 have an alignment direction defined by the horizontal alignment films 7 and 8 and a molecular major axis in one direction. They 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, between the observation-side substrate 3 and the polarizing plate 11 on that side.

  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.

  Next, the surface light source 15 disposed on the opposite side of the liquid crystal display panel 1 from the observation side will be described. 4 and 5 are views seen from the emission surface side and the upper side of the surface light source 15, and FIG. 6 is an enlarged sectional view in which hatching along the line VI-VI in FIG. 4 is omitted.

  The surface light source 15 is disposed to face the surface opposite to the observation side of the liquid crystal display panel 1 and has a horizontally long rectangular shape corresponding to the screen shape of the liquid crystal display panel 1. An incident part for making light incident on at least one of two long side parts substantially parallel to the upper and lower edges of the screen of the display panel 1 is formed, the direction of incident light incident from the incident part is changed, and the light is The liquid crystal at an exit angle corresponding to a tilt angle of the incident light in the horizontal direction with respect to the vertical direction with respect to a plane parallel to the normal line of the liquid crystal display panel 1 and along the vertical direction of the screen of the liquid crystal display panel 1. Direction changing means 16 that emits light to the display panel side, and disposed opposite to the incident portion of the direction changing means 16, and toward the incident portion, left and right as viewed from the liquid crystal display panel 1 side with respect to the vertical direction. Light intensity in either direction First light having directivity in which a peak exists and second light having directivity in which a light intensity peak exists in a direction inclined to the other side with respect to the vertical direction are selectively emitted. The light source unit 28 is included.

  The direction changing means 16 of the surface light source 15 in this embodiment includes two substantially parallel surfaces with the upper and lower edges of the screen of the liquid crystal display panel 1 among the peripheral surfaces of a transparent member made of rectangular plate-like acrylic resin or the like. An incident surface 17 for allowing light to enter the transparent member is formed on at least one of the long sides, and light is emitted to the plate surface facing the liquid crystal display panel 1 out of the two plate surfaces of the transparent member. An exit surface 18 is formed, and a light guide plate having a reflection surface 19 for reflecting light incident from the entrance surface 17 toward the exit surface 18 is formed on the opposite plate surface. Hereinafter, this turning means 16 is referred to as a light guide plate.

  The light guide plate 16 is formed with an emission surface 18 facing the liquid crystal display panel 1 on a flat surface parallel to the panel surface of the liquid crystal display panel 1, and an opposite reflection surface 19 is formed on the liquid crystal display panel 1. A plurality of elongated grooves 20 along the horizontal direction of the screen are formed on the uneven surface provided at a constant pitch in the direction along the vertical direction of the screen of the liquid crystal display panel 1. Then, the light is totally reflected at the interface between the side surfaces of the plurality of elongated grooves 20 on the reflection surface 19 and the outside air (air), and is emitted from the emission surface 18.

  In the drawing, the plurality of elongated grooves 20 on the reflection surface 19 of the light guide plate 16 are greatly exaggerated, but the elongated grooves 20 are pixels in the vertical direction (column direction) of the screen of the liquid crystal display panel 1. The pitch is equal to or smaller than the pitch.

  In addition, a part of the light incident on the light guide plate 16 from the incident surface 17 is internally reflected by the left and right end surfaces at the left and right end surfaces of the light guide plate 16 to become stray light. A light absorbing film 21 for preventing the light from being emitted from the light exit surface 18 is provided. On the rear side of the light guide plate 16, the light out of the light incident from the light entrance surface 17 into the light guide plate 16 is reflected. A reflecting plate 22 for reflecting the light leaking to the rear side of the light guide plate 16 through the interfaces between the side surfaces of the plurality of elongated grooves 20 on the surface 19 and the outside air and emitting the light from the exit surface 18 of the light guide plate 16. Has been placed.

  The light source unit 28 of the surface light source 15 includes a plurality of solid state light emitting elements 29a and 29b that emit light having directivity in which a light intensity peak exists in one direction, and the plurality of solid state light emitting elements. Half of the first solid-state light emitting elements 29 a and 29 b of the other solid-state light-emitting elements 29 b are selectively turned on and driven toward the incident surface 17 of the light guide plate 16. First light having directivity in which a light intensity peak exists in a direction inclined to either the left or right when viewed from the liquid crystal display panel 1 side with respect to the vertical direction of the screen of the liquid crystal display panel 1, and the vertical direction The second light having the directivity in which the light intensity peak exists in the direction inclined to the other is selectively emitted.

  Although the structure of the solid light emitting elements 29a and 29b is not shown, an LED (light emitting diode) is molded with a transparent resin, and the emitted light from the light emitting point of the LED is directed in one direction on the emission side. It has a condensing lens for emitting as directional light.

  The plurality of solid state light emitting elements 29 a and 29 b are arranged on the outside of the incident surface 17 of the light guide plate 16 so that the light emission direction of half of the first solid state light emitting elements 29 a is the vertical direction of the screen of the liquid crystal display panel 1. With respect to the liquid crystal display panel 1 side, the light emission direction of the other half of the second solid state light emitting elements 29b is inclined to the other direction with respect to the vertical direction. It is arranged in the direction.

  In this embodiment, the incident surfaces that allow light to enter the two long sides of the light guide plate 16, that is, the upper side corresponding to the upper edge of the screen of the liquid crystal display panel 1 and the lower side corresponding to the lower edge of the screen, respectively. 17, and the plurality of elongated grooves 20 on the reflection surface 19 of the light guide plate 16 are the same in the upper side direction and the lower side direction of the light guide plate 16 with respect to the normal line of the emission surface 18 of the light guide plate 16. It is formed in an isosceles triangular cross-sectional shape having two inclined surfaces inclined at an angle, for example, 45 ° ± 5 °, and is formed outside one incident surface of the light guide plate 16, for example, the upper side incident surface 17. The half of the first solid-state light emitting elements 29a are arranged in the length direction of the incident surface 17, and the light emission direction of these solid-state light emitting elements 29a is set in the liquid crystal display panel 1 with respect to the vertical direction of the screen. When viewing from the display panel 1 side, The other half of the second solid-state light emitting elements 29b are arranged on the other incident surface of the light guide plate 16, that is, outside the incident surface 17 on the lower side, and the incident light is incident on the inclined direction at a predetermined angle. Arranged in the length direction of the surface 17, the light emission direction of these solid state light emitting elements 29 b is on the right side when viewed from the liquid crystal display panel 1 side with respect to the vertical direction. It is arranged in the direction tilted at the same angle as the tilt angle.

  In the figure, for the sake of simplicity, three solid light emitting elements 29a and 29b are shown on the outside of the incident surface 17 on the upper side and the lower side of the light guide plate 16, respectively. Each of the solid light-emitting elements 29a and 29b is disposed in a necessary number at intervals at which light having a uniform intensity distribution can be incident on the entire light guide plate 16 in the left-right direction.

  The surface light source 15 guides one of the first light from the first solid state light emitting element 29a and the second light from the second solid state light emitting element 29b of the light source unit 28 by the light guide plate 16, and The left-eye illumination light having a directivity in which the peak of the emitted light intensity exists in a direction inclined in the direction of the left eye of the display observer with respect to the normal line of the liquid crystal display panel 1 is emitted from the light source unit 28. The other of the first light and the second light is guided by the light guide plate 16 and a peak of the emitted light intensity exists in a direction inclined to the right eye direction of the display observer with respect to the normal line of the liquid crystal display panel 1. The right-eye illumination light having directivity is emitted.

  That is, the surface light source 15 forms incident surfaces 17 on the two long side portions of the light guide plate 16, that is, the upper side portion and the lower side portion, respectively, and the light intensity in one direction is outside the incident surface 17 on the upper side portion. The first solid-state light emitting element 29a that emits light having directivity with a peak is left when the light emission direction is viewed from the liquid crystal display panel 1 side with respect to the vertical direction of the screen of the liquid crystal display panel 1. The second solid-state light emitting element 29b that emits light having directivity in which a light intensity peak exists in one direction is disposed outside the incident surface 17 on the lower side. The first light emitted from the first solid-state light emitting element 29a is arranged in a direction inclined to the right when viewed from the liquid crystal display panel 1 side with respect to the vertical direction. From the incident surface 17 on the upper side to the light guide plate 16, The second light that is incident in the direction inclined to the left as viewed from the liquid crystal display panel 1 side with respect to the lower direction and is emitted from the second solid-state light emitting element 29b is indicated by a broken line in FIG. As described above, the light is incident on the light guide plate 16 from the incident surface 17 on the lower side of the light guide plate 16 in a direction inclined leftward when viewed from the liquid crystal display panel 1 side with respect to the vertical direction.

  Then, the first light incident on the light guide plate 16 from the entrance surface 17 on the upper side thereof is reflected and reflected at the interface between the light exit surface 18 of the light guide plate 16 and the outside air, as indicated by the arrow in FIG. The light guide plate 16 is guided along the vertical direction while being totally reflected at the interface between the flat surface portion between the plurality of elongated grooves on the surface 19 and the outside air, and 2 of the elongated grooves 20 on the reflecting surface 19 of the light guide plate 16. Among the two inclined surfaces, the light is totally reflected at the interface between the inclined surface inclined to the upper side direction of the light guide plate 16 and the outside air with respect to the normal line of the light exit surface 18 of the light guide plate 16, and changes its direction. As shown by an arrow line, the right direction when viewed from the liquid crystal display panel 1 side with respect to the normal line of the emission surface 18, that is, the left direction of the display observer with respect to the normal line of the liquid crystal display panel 1 The light guide becomes the left-eye illumination light having directivity in which the peak of the emitted light intensity exists in the inclined direction. 16 of the exit from the exit surface 18.

  In addition, the second light incident on the light guide plate 16 from the lower incident surface 17 toward the right side when viewed from the liquid crystal display panel 1 side with respect to the vertical direction is broken in FIG. As indicated by the lines, of the two inclined surfaces of the elongated groove 20 of the reflection surface 19 of the light guide plate 16, the light guide plate 16 is inclined toward the lower side of the light guide plate 16 with respect to the normal line of the emission surface 18. The direction is changed by total reflection at the interface between the inclined surface and the outside air, as shown by the broken line in FIGS. The light guide plate becomes the right-eye illumination light having directivity in which the peak of the emitted light intensity exists in the direction, that is, the direction inclined to the right eye direction of the display observer with respect to the normal line of the liquid crystal display panel 1 16 exits from the exit surface 18.

FIG. 7 is a ray diagram schematically showing a path along which the first light and the second light reflected by the reflecting surface 19 of the light guide plate 16 travel, and the incident surface 17 on the upper side of the light guide plate 16. The first incident light incident on the liquid crystal display panel 1 in the direction tilted to the left when viewed from the liquid crystal display panel 1 side with respect to the vertical direction Y of the screen of the liquid crystal display panel 1 is as indicated by an arrow in the figure. The light is reflected by an inclined surface inclined in the upper side direction of the light guide plate of the elongated groove 20 of the reflection surface 19 (upper side direction with respect to the normal line of the emission surface 18 of the light guide plate 16), and from the emission surface 18 of the light guide plate 16; According to the inclination angle θ _1a of the first incident light with respect to the vertical direction Y with respect to a plane parallel to the normal line H of the liquid crystal display panel 1 and along the vertical direction Y of the screen of the liquid crystal display panel 1 an output angle _{θ 1b (θ 1a = θ 1b} ) viewed from the left side (the liquid crystal display panel 1 side In different directions in a direction inclined to the left) emitted from the emission surface 18 of the light guide plate 16 to the liquid crystal display panel 1 side.

In addition, the second light incident from the incident surface 17 on the lower side of the light guide plate 16 toward a direction inclined rightward when viewed from the liquid crystal display panel 1 side with respect to the vertical direction Y of the screen of the liquid crystal display panel 1. As shown by the broken line in FIG. 7, the incident light is tilted in the direction of the lower side of the light guide plate of the elongated groove 20 of the reflection surface 19 (the direction of the lower side relative to the normal line of the output surface 18 of the light guide plate 16). The second surface of the light guide plate 16 is reflected from a surface of the light guide plate 16 parallel to the normal line H of the liquid crystal display panel 1 and along the vertical direction Y of the screen of the liquid crystal display panel 1. Is emitted to the liquid crystal display panel 1 side at an emission angle θ _2b (θ _2a = θ _2b ) corresponding to the inclination angle θ _2a in the left-right direction with respect to the vertical direction.

  Thus, the surface light source 15 guides the first light from the first solid state light emitting element 29a disposed outside the incident surface 17 on the upper side of the light guide plate 16 by the light guide plate 16. The light guide plate 16 emits left-eye illumination light having a directivity in which a peak of emitted light intensity exists in a direction inclined to the left eye direction of the display observer with respect to the normal H of the liquid crystal display panel 1. The second light from the second solid-state light emitting element 29b disposed outside the incident surface 17 on the lower side of the light is guided by the light guide plate 16 and is displayed with respect to the normal line of the liquid crystal display panel 1 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 is emitted.

  In this embodiment, the first solid-state light emitting element 29a and the second solid-state light emitting element 29b are arranged such that the light emission directions are on the left side and the right side with respect to the vertical direction of the screen of the liquid crystal display panel 1. The plurality of elongated grooves 20 of the reflection surface 19 of the light guide plate 16 are arranged in the direction inclined at the same angle, and the upper side direction and the lower side of the light guide plate 16 with respect to the normal line H of the liquid crystal display panel 1. The left-eye illumination light and the right-eye illumination light are the same as those of the liquid crystal display panel 1 because they are formed in an isosceles triangular cross-section having two inclined surfaces inclined at the same angle with respect to the direction. This light has directivity in which the peak of the emitted light intensity exists in the direction inclined at the same angle on the left side and the right side with respect to the line H.

  Furthermore, in this embodiment, the inclination angles of the two inclined surfaces of the plurality of elongated grooves 20 formed in the isosceles triangular cross-sectional shape of the reflecting surface 19 of the light guide plate 16 (the method of the exit surface 18 of the light guide plate 16). Since the left-eye illumination light and the right-eye illumination light are set to a vertical plane (liquid crystal display) along the horizontal direction of the screen of the liquid crystal display panel 1. The light is emitted in the direction near the surface parallel to the normal H of the panel 1.

  Further, although the specific configuration of the control unit 35 shown in FIG. 1 is not shown, the 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 driving circuit for the first and second solid state light emitting elements 29a and 29b comprises a plurality of pixels of the liquid crystal display panel 1, and image data for the left eye and right eye for observation with separate left and right eyes. The image data is selectively written, and the first solid state light emitting element 29a of the surface light source 15 is driven to be driven in synchronization with the writing of the left eye image data, and is synchronized with the writing of the right eye image data. The second solid state light emitting element 29b of the surface light source 15 is driven to turn on.

  The liquid crystal display device of this embodiment displays a stereoscopic color image by field sequential display, and the first and second solid state light emitting devices 29a and 29b are respectively a red LED emitting red light and a green color. It includes a green LED that emits light and a blue LED that emits blue light, and selectively emits light of three colors of red, green, and blue.

  Then, the control means 35 performs image data for left eye and right eye of unit colors of red, green and blue for each of six fields obtained by dividing one frame for displaying one stereoscopic color image into six. One of the image data for image is selected in an arbitrary order and 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 Then, the LED of the color of the writing image data among the red, green and blue LEDs of the first solid state light emitting element 29a is driven to turn on, and the left-eye illumination light of that color is sent from the surface light source 15. The written image data of the red, green, and blue LEDs of the second solid-state light emitting element 29b in synchronization with the writing of the image data for the right eye of each unit color of red, green, and blue. LED lighting of the color is turned on and lighting for the right eye of that color The thereby emitted from the surface light source 15.

  That is, in the liquid crystal display device, left and right image data of red, green, and blue unit colors and red, green, and blue units are applied to the plurality of pixels of the liquid crystal display panel 1 by the control unit 35. The image data for the right eye of the color is selectively written and synchronized with the writing of the image data for the left eye of each unit color from the surface light source 15 to the normal H of the liquid crystal display panel 1. The illumination light for the left eye of each unit color of red, green, and blue having directivity in which the peak of the emitted light intensity exists in the direction inclined to the left eye direction of the display observer is emitted to the right of each unit color. In synchronism with the writing of ophthalmic image data, there is a peak of emitted light intensity in a direction inclined from the surface light source 15 toward the right eye of the display observer with respect to the normal H of the liquid crystal display panel 1. The right eye illumination light of each unit color of red, green and blue with directivity is emitted. As a result, the liquid crystal display panel 1 has left-eye images of red, green, and blue unit colors corresponding to the left-eye image data, and red, green, and blue colors corresponding to the right-eye image data. The right eye image of each unit color is sequentially displayed to allow the display observer to observe the stereoscopic image.

  The liquid crystal display device displays left-eye images by writing left-eye image data to a plurality of pixels of the liquid crystal display panel 1 and emitting left-eye illumination light from the surface light source 15, and the liquid crystal Since the writing of the right-eye image data to the plurality of pixels of the display panel 1 and the display of the left-eye image by emitting the right-eye illumination light from the surface light source 15 are sequentially performed, the left eye The image for the right eye and the image for the right eye can be displayed using all the pixels of the liquid crystal display panel 1, respectively, and therefore a high-resolution stereoscopic image can be displayed.

  In addition, this liquid crystal display device has the surface light source 15 on the side opposite to the viewing side of the liquid crystal display panel 1, and the left-eye illumination light and right-eye illumination light from the surface light source 15 are transmitted to the liquid crystal display panel. Since it should just arrange | position so that it may inject into the whole region of 1 screen area | region 1a, it can manufacture easily.

  Further, the liquid crystal display device is arranged such that the surface light source 15 is opposed to the surface opposite to the observation side of the liquid crystal display panel 1 having a horizontally long rectangular screen region 1a. A light incident surface 17 is formed for allowing light to enter two long sides substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel 1, respectively. The direction of incident light incident from the incident surface 17 is changed, and the incident light is directed to a surface parallel to the normal line H of the liquid crystal display panel 1 and along the vertical direction of the screen of the liquid crystal display panel 1. A light guide plate 16 that emits light toward the liquid crystal display panel 1 at an exit angle corresponding to a tilt angle of the light guide plate in the left-right direction with respect to the up-down direction, and the incident surface 17 of the light guide plate 16. 17 toward the up and down direction On the other hand, when viewed from the liquid crystal display panel 1 side, the first light having the directivity in which the peak of the light intensity exists in the direction inclined to the left or right, and the direction inclined to the other with respect to the vertical direction. A light source part 28 that selectively emits second light having directivity in which a peak of light intensity exists, and one of the first and second lights from the light source part 28 The left-eye illumination light having a directivity in which a peak of the emitted light intensity exists in a direction inclined to the left eye direction of the display observer with respect to the normal H of the liquid crystal display panel 1 by being guided by the light plate 16 is emitted. The other of the first and second lights from the light source unit 28 is guided by the light guide plate 16 and tilted in the right eye direction of the display observer with respect to the normal H of the liquid crystal display panel 1. A structure that emits right-eye illumination light with directivity in which the peak of the emitted light intensity exists. Because then those were, thereby emitting the surface light source 15 the vertical light intensity over the entire uniform left eye illuminating light and the right-eye illumination of a screen of the liquid crystal display panel 1 from.

  That is, the attenuation of the light intensity in the light guide plate 16 of the light incident on the light guide plate 16 from the incident surface 17 increases according to the light guide distance in the light guide plate 16. An incident surface 17 is formed on a long side portion substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel 1 of the light guide plate 16 having a horizontally long rectangular outer shape corresponding to the screen shape of the liquid crystal display panel 1, Since the light incident from the incident surface 17 is guided in the direction along the short side of the light guide plate 16 and is emitted from the output surface 18 of the light guide plate 16, the light guide distance in the light guide plate 16 is short. Therefore, the light incident from the incident surface 17 can be emitted from the emission surface 18 with almost no attenuation of light intensity.

  Therefore, according to this liquid crystal display device, the left-eye illumination light and the right-eye illumination light having uniform light intensity are emitted from the surface light source 15 over the entire vertical direction of the screen of the liquid crystal display panel 1, and the liquid crystal It is possible to display a high-quality stereoscopic image with no luminance unevenness on the display panel 1.

  In the liquid crystal display device of the above embodiment, the light guide plate 16 of the surface light source 15 has two lengths substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel 1 on the peripheral surface of the rectangular plate-shaped transparent member. An incident surface 17 for allowing light to enter the transparent member is formed on each side, and an output surface 18 for emitting light to the plate surface facing the liquid crystal display panel 1 out of the two plate surfaces of the transparent member. Since the reflection surface 19 that reflects the light incident from the incident surface 17 toward the emission surface 18 is formed on the opposite plate surface, the first light from the light source unit 28 is formed. The second light is guided by the light guide plate 16 and the left-eye illumination light and the right-eye illumination light having uniform light intensity are emitted from the emission surface 18 over the entire vertical direction of the screen of the liquid crystal display panel 1. , High quality LCD panel without uneven brightness Stereoscopic image can be displayed.

  In the liquid crystal display device of the above embodiment, the light source unit 28 of the surface light source 15 is constituted by a plurality of solid state light emitting elements 29a and 29b that emit light having directivity in which a light intensity peak exists in one direction. Half of the first solid state light emitting elements 29a are arranged outside the one incident surface 17 of the light guide plate 16, and the light emitting direction of these solid state light emitting elements 29a is set in the vertical direction of the screen of the liquid crystal display panel 1. The other half of the second solid state light emitting elements 29b are arranged on the other incident surface 17 of the light guide plate 16 with respect to the liquid crystal display panel 1 side. Since the light emitting direction of these solid state light emitting elements 29b is arranged on the outer side in a direction inclined to the other side with respect to the vertical direction, one of the first and second solid state light emitting elements 29a is disposed. Light from the light guide plate 16 The light from the other solid-state light emitting element 29b is emitted as right-eye illumination light by the light guide plate 16, and the intensity of the left-eye illumination light and right-eye illumination light is increased. It is possible to display a high-quality stereoscopic image with a good luminance balance between the left-eye image and the right-eye image on the liquid crystal display panel 1.

(Second Embodiment)
In the first embodiment, the surface light source 15 is made incident on the light incident plate 17 so that light is incident on two long sides substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel 1 of the light guide plate 16. The first solid-state light emitting elements 29a are arranged outside the one incident surface 17 in the length direction thereof, and the length direction is arranged outside the other incident surface 17 of the light guide plate 16. The surface light source 15 includes the first solid light emitting element 29a and the second solid light emitting element 29b arranged on the incident surface 17 of the light guide plate 16. It is good also as a structure arrange | positioned alternately in the length direction on the outer side.

  8 to 10 show a second embodiment of the present invention. FIG. 8 is a view as seen from the exit surface side of the surface light source, and FIG. 9 is an enlarged view omitting hatching along the line IX-IX in FIG. It is sectional drawing.

  The surface light source 15a of this embodiment changes the direction of incident light, and changes the direction of the light emitted to the liquid crystal display panel 1 shown in FIGS. 1 and 2, out of the peripheral surface of the rectangular plate-like transparent member. One of two long side portions substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel 1, for example, a lower side portion corresponding to the lower edge of the screen of the liquid crystal display panel 1, light is transmitted into the transparent member. An incident surface 17a to be incident is formed, and among the two plate surfaces of the transparent member, an emission surface 18a that emits light is formed on the plate surface facing the liquid crystal display panel 1, and on the opposite plate surface, The light guide plate 16a is formed with a reflection surface 19a for reflecting the light incident from the incident surface 17a toward the exit surface 18a, and the light intensity in one direction described above is formed outside the incident surface 17a of the light guide plate 16a. Emits light with directivity in the presence of peaks The light source unit 28 composed of a plurality of solid state light emitting elements 29a and 29b is arranged on the liquid crystal display panel 1 side with respect to the vertical direction of the screen of the liquid crystal display panel 1 with respect to the light emitting direction of half of the first solid state light emitting elements 29a. The light emission direction of the other half of the second solid state light emitting elements 29b is directed to the other, that is, the direction inclined to the right side with respect to the vertical direction. The light incident surfaces 17a are alternately arranged in the length direction.

  In the surface light source 15a of this embodiment, the light guide plate 16a has a light emitting surface 18a facing the liquid crystal display panel 1 formed on a flat surface parallel to the panel surface of the liquid crystal display panel 1, and a reflective surface on the opposite side. 19a is formed on an uneven surface provided with a plurality of elongated grooves 20a along the horizontal direction of the screen of the liquid crystal display panel 1 at a constant pitch in the direction along the vertical direction of the screen of the liquid crystal display panel 1. The light incident from the incident surface 17a is totally reflected at the interface between the side surfaces of the plurality of elongated grooves 20a of the reflecting surface 19a and the outside air and is emitted from the emitting surface 18a.

  In the figure, the plurality of elongated grooves 20a on the reflecting surface 19a of the light guide plate 16a are greatly exaggerated, but the elongated grooves 20a are substantially the same as the pixel pitch in the vertical direction of the screen of the liquid crystal display panel 1. Or it is formed with a smaller pitch.

  The plurality of elongated grooves 20a on the reflection surface 19a of the light guide plate 16a has a triangular shape having two inclined surfaces respectively in the upper side direction and the lower side direction of the light guide plate 16a with respect to the normal line of the emission surface 18a of the light guide plate 16a. Of the two inclined surfaces, the inclination angle of the inclined surface on the incident surface side inclined in the direction of the incident surface 17a (lower side direction) (angle with respect to the normal line of the exit surface 18a) is 45 °. The opposite inclined surface set to ± 5 ° and inclined in the opposite direction has an inclination angle corresponding to the pitch of the elongated grooves 20a.

  Similarly to the first embodiment described above, a light absorbing film 21 is provided on each of the left and right end faces of the light guide plate 16a, and a reflector 22 is disposed on the rear side of the light guide plate 16a. ing.

FIG. 10 schematically shows a path along which the first light from the first solid state light emitting element 29a and the second light from the second solid state light emitting element 29b reflected by the reflecting surface 19a of the light guide plate 16a travel. The first light incident from the incident surface 17a of the light guide plate 16a toward the direction inclined to the left when viewed from the liquid crystal display panel 1 side with respect to the vertical direction Y of the screen of the liquid crystal display panel 1. The incident light 1 is reflected by the inclined surface on the incident surface side of the elongated groove 20a of the reflecting surface 19a, as indicated by the arrow in the figure, and from the exit surface 18a of the light guide plate 16a, the liquid crystal display panel 1 method. An emission angle θ _1b (corresponding to an inclination angle θ _1a of the first incident light with respect to the vertical direction Y with respect to a plane parallel to the line H and along the vertical direction Y of the screen of the liquid crystal display panel 1. left at θ _1a = θ _1b) (liquid crystal display panel 1 In different directions in a direction inclined to the left) emitted from the emission surface 18 of the light guide plate 16 to the liquid crystal display panel 1 side when viewed from.

Further, the second incident light incident from the incident surface 17a of the light guide plate 16a toward the direction inclined to the right when viewed from the liquid crystal display panel 1 side with respect to the vertical direction Y of the screen of the liquid crystal display panel 1 is As shown by the broken line in FIG. 10, the light is reflected by the inclined surface on the incident surface side of the elongated groove 20a of the reflective surface 19a, and the normal line H of the liquid crystal display panel 1 from the light exit surface 18a of the light guide plate 16a. And an exit angle θ _2b corresponding to a tilt angle θ _2a in the left-right direction with respect to the up-down direction of the second incident light with respect to a plane along the up-down direction Y of the screen of the liquid crystal display panel 1. The light is emitted to the liquid crystal display panel 1 side at (θ _2a = θ _2b ).

  As described above, the surface light source 15a includes the first and second solid light emitting elements 29a and 29b arranged alternately and arranged outside the incident surface 17a of the light guide plate 16a. The first light is guided by the light guide plate 16a and has a directivity in which a peak of the emitted light intensity exists in a direction inclined in the left eye direction of the display observer with respect to the normal H of the liquid crystal display panel 1. The left-eye illumination light is emitted, the second light from the second solid-state light emitting element 29b is guided by the light guide plate 16, and the right of the display observer with respect to the normal line of the liquid crystal display panel 1 The right-eye illumination light having directivity in which the peak of the emitted light intensity exists in the direction inclined to the eye direction is emitted.

  In this embodiment, the first solid-state light emitting element 29a and the second solid-state light emitting element 29b are arranged such that the light emission directions are on the left side and the right side with respect to the vertical direction of the screen of the liquid crystal display panel 1. The left-eye illumination light and the right-eye illumination light are arranged at the same angle on the left side and the right side with respect to the normal H of the liquid crystal display panel 1. It is light having directivity in which a peak of emitted light intensity exists in an inclined direction.

  Further, in this embodiment, of the two inclined surfaces of the plurality of elongated grooves 20 of the reflection surface 19a of the light guide plate 16a, the incident surface side inclination that reflects the light incident from the incident surface 17a toward the output surface 18a. Since the inclination angle of the surface (angle with respect to the normal line of the exit surface 18a of the light guide plate 16a) is set to 45 ° ± 5 °, the left-eye illumination light and the right-eye illumination light are used in the liquid crystal display panel 1. Are emitted toward a direction near a vertical plane (a plane parallel to the normal line H of the liquid crystal display panel 1) along the horizontal direction of the screen.

  In the surface light source 15a, the light guide plate 16a has an incident surface 17a on a long side portion substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel 1 on the peripheral surface of the rectangular plate-shaped transparent member. Of the two plate surfaces of the transparent member, an emission surface 18a for emitting light is formed on the plate surface facing the liquid crystal display panel 1, and incident on the opposite plate surface from the incident surface 17a. Since the reflection surface 19a for reflecting the reflected light toward the emission surface 18a is formed, the light intensity of the first and second light from the light source unit 28 is almost attenuated by the light guide plate 16a. The left-eye illumination light and the right-eye illumination light having uniform light intensity are emitted over the entire vertical direction of the screen of the liquid crystal display panel 1 so that the liquid crystal display panel has high quality without luminance unevenness. 3D images are displayed Door can be.

  Therefore, according to the liquid crystal display device in which the surface light source 15a is arranged to face the surface opposite to the observation side of the liquid crystal display panel 1, the surface light source 15a extends in the vertical direction of the screen of the liquid crystal display panel 1. The left-eye illumination light and the right-eye illumination light having a uniform light intensity over the entire area can be emitted, and a high-quality stereoscopic image without luminance unevenness can be displayed on the liquid crystal display panel 1.

  In this embodiment, the incident surface 17a is formed on one of the two long sides of the light guide plate 16a. However, the incident surface 17a is formed on both of the two long sides of the light guide plate 16a. The first and second solid state light emitting devices 29a and 29b may be alternately arranged on the outside of the incident surface 17a.

(Third embodiment)
FIGS. 11 to 13 show a third embodiment of the present invention, FIG. 11 is a view seen from the exit surface side of the surface light source, and FIG. 12 is an enlarged view omitting hatching along the line XII-XII in FIG. It is sectional drawing.

  The surface light source 15b of this embodiment changes the direction of incident light and emits the direction changing means 16b that emits light toward the liquid crystal display panel 1 shown in FIGS. 1 and 2 on the surface facing the liquid crystal display panel 1. An output surface 24 having a flat surface parallel to the panel surface of the panel 1 is formed, and a plurality of elongated prisms 25 extending in the left-right direction of the screen of the liquid crystal display panel 1 are formed in parallel to each other on the opposite surface. The prism sheet 23 and a rectangular reflector 26 facing the prism forming surface of the prism sheet 23 with a space in between, and the liquid crystal in the periphery of the space between the prism sheet 23 and the reflector 26 An incident portion that causes light to enter the space into one of two long side portions substantially parallel to the upper and lower edges of the screen of the display panel 1, for example, the lower side portion corresponding to the lower edge of the screen of the liquid crystal display panel 1 Shape 27 A light source unit composed of a plurality of solid state light emitting elements 29a and 29b for emitting light having directivity in which the light intensity peak exists in one direction as described above outside the incident part 27 of the redirecting means 16b. 28, the light emitting direction of half of the first solid state light emitting elements 29a is tilted to either the left or right, for example, the left side when viewed from the liquid crystal display panel 1 side with respect to the vertical direction of the screen of the liquid crystal display panel 1. The light emitting directions of the other half of the second solid state light emitting elements 29b are alternately directed in the length direction of the incident portion 27 so that the light emitting direction of the second solid light emitting elements 29b is directed to the other direction, that is, the direction inclined to the right side. They are arranged side by side.

  The plurality of elongated prisms 25 of the prism sheet 23 of the diverting means 16b have the same angle in the upper side direction and the lower side direction of the prism sheet 23 with respect to the normal line of the emission surface 24 of the prism sheet 23, for example, 45. This is an isosceles triangular prism having two inclined surfaces inclined at an angle of ± 5 °. In the figure, the elongated prism 25 is greatly exaggerated, but the elongated prism 25 is formed on the liquid crystal display panel 1. Are formed at a pitch equal to or smaller than the pixel pitch in the vertical direction of the screen.

  Although not shown in the drawing, light is applied to the long side portion opposite to the incident portion 27 and the left and right short side portions in the periphery of the space between the prism sheet 23 and the reflecting plate 26, respectively. An absorber is arranged.

  The surface light source 15b is a first light source from the first solid-state light-emitting element 29a among the first and second solid-state light-emitting elements 29a and 29b arranged alternately on the outside of the incident portion 27 of the deflecting means 16b. Is directed by the deflecting means 16b, and has a directivity in which a peak of the emitted light intensity exists in a direction inclined to the left eye direction of the display observer with respect to the normal H of the liquid crystal display panel 1. The left-eye illumination light is emitted, the second light from the second solid-state light emitting element 29b is guided by the turning means 16b, and the right eye of the display observer with respect to the normal line of the liquid crystal display panel 1 A right-eye illumination light having a directivity in which a peak of the emitted light intensity exists in a direction inclined to the direction is emitted from the solid-state light emitting elements 29a and 29b, and an incident portion of the redirecting means 16b. 27 to the prism sheet 23 and the reflector 26 As shown by the arrow in FIG. 12, the light incident on the space is directly incident on the plurality of elongated prisms 25 of the prism sheet 23, or is reflected by the reflector 26 and is reflected on the plurality of prism sheets 23. Are incident on the elongated prism 25, are refracted by the elongated prism 25, and exit from the exit surface 24 of the prism sheet 23.

FIG. 13 schematically shows a path along which the first light from the first solid state light emitting element 29a and the second light from the second solid state light emitting element 29b refracted by the prism sheet 23 of the deflecting means 16b travel. FIG. 3 is a ray diagram schematically showing that light is incident from a light incident portion 27 of the deflecting means 16b toward a direction inclined to the left when viewed from the liquid crystal display panel 1 side with respect to the vertical direction Y of the screen of the liquid crystal display panel 1. The first incident light is incident on the elongated prism 25 from the inclined surface on the incident portion 27 side of the elongated prism 25 of the prism sheet 23 and is opposite to the elongated prism 25 as indicated by an arrow in the figure. Refracted at the interface between the inclined surface on the side and the outside air, parallel to the normal line H of the liquid crystal display panel 1 and along the vertical direction Y of the screen of the liquid crystal display panel 1 from the emission surface 24 of the prism sheet 23 Front to face First the vertical direction Y direction in a direction inclined to the left at the exit angle theta _1b in accordance with the tilt angle _{θ 1a (θ 1a = θ 1b} ) ( left direction as viewed from the liquid crystal display panel 1 side) with respect to the incident light The light is emitted from the light exit surface 18 of the light guide plate 16 to the liquid crystal display panel 1 side.

In addition, the second incident light incident from the incident portion 27 of the deflecting means 16b toward the right side when viewed from the liquid crystal display panel 1 side with respect to the vertical direction Y of the screen of the liquid crystal display panel 1. As shown by the broken line in FIG. 13, the slanted prism 25 is incident on the slender prism 25 from the slanted surface on the incident portion 27 side of the slender prism 25 and the slanted surface on the opposite side of the slender prism 25. Refracting at the interface between the liquid crystal display panel 1 and the surface parallel to the normal H of the liquid crystal display panel 1 and along the vertical direction Y of the screen of the liquid crystal display panel 1 The second incident light is emitted toward the liquid crystal display panel 1 at an emission angle θ _2b (θ _2a = θ _2b ) corresponding to a tilt angle θ _2a in the horizontal direction with respect to the vertical direction.

  As described above, the surface light source 15b is the first solid light emitting element 29a among the first and second solid light emitting elements 29a and 29b arranged alternately on the outside of the incident portion 27 of the direction changing means 16b. The first light from the direction is guided by the direction changing means 16b, and the direction in which the peak of the emitted light intensity exists in the direction tilted in the direction of the left eye of the display observer with respect to the normal H of the liquid crystal display panel 1. The left-eye illumination light having the characteristic is emitted, the second light from the second solid-state light emitting element 29b is guided by the turning means 16b, and the display is observed with respect to the normal line of the liquid crystal display panel 1. 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 person is emitted.

  In this embodiment, the first solid-state light emitting element 29a and the second solid-state light emitting element 29b are arranged such that the light emission directions are on the left side and the right side with respect to the vertical direction of the screen of the liquid crystal display panel 1. The left-eye illumination light and the right-eye illumination light are arranged at the same angle on the left side and the right side with respect to the normal H of the liquid crystal display panel 1. It is light having directivity in which a peak of emitted light intensity exists in an inclined direction.

  Further, in this embodiment, the plurality of elongated prisms 25 of the prism sheet 23 of the deflecting means 16b are arranged 45 in the upper side direction and the lower side direction of the prism sheet 23 with respect to the normal line of the emission surface 24 of the prism sheet 23. Since the left-eye illumination light and the right-eye illumination light are formed in an isosceles triangle shape having two inclined surfaces inclined at an angle of ± 5 °, the left-right direction of the screen of the liquid crystal display panel 1 Is emitted toward a direction near a vertical plane (a plane parallel to the normal line H of the liquid crystal display panel 1).

  In the surface light source 15b, an exit surface 24 for emitting light is formed on the surface facing the liquid crystal display panel 1 from the direction changing means 16b, and the screen of the liquid crystal display panel 1 is formed on the opposite surface. The prism sheet comprises a rectangular prism sheet 23 in which a plurality of elongated prisms 25 extending in the left-right direction are formed in parallel to each other, and a rectangular reflector 26 facing the prism forming surface of the prism sheet 23 with a space in between. An incident portion 27 for allowing light to enter the space is formed in a long side portion substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel 1 in the space between the space 23 and the reflection plate 26. Therefore, the first and second lights from the light source unit 28 are guided by the diverting means 16b with almost no attenuation of light intensity, so that the top and bottom of the screen of the liquid crystal display panel 1 are Light intensity across the entire direction is to emit a uniform left-eye illuminating light and the right-eye illumination light, it is possible to display a high-quality three-dimensional image with no luminance unevenness on the liquid crystal display panel.

  Therefore, according to the liquid crystal display device in which the surface light source 15b is disposed so as to face the surface opposite to the observation side of the liquid crystal display panel 1, the surface light source 15b extends in the vertical direction of the screen of the liquid crystal display panel 1. The left-eye illumination light and the right-eye illumination light having a uniform light intensity over the entire area can be emitted, and a high-quality stereoscopic image without luminance unevenness can be displayed on the liquid crystal display panel 1.

  In this embodiment, the incident portion 27 is formed on one of the two long side portions of the turning means 16b. However, the incident portion 27 is formed on both of the two long side portions of the turning means 16b. The first and second solid state light emitting elements 29 a and 29 b are alternately arranged outside the incident part 27, or the first solid state light emitting element 29 a is disposed outside the one incident part 27. And the second solid state light emitting device 29b may be disposed outside the other incident portion 27.

(Fourth embodiment)
FIGS. 14 to 17 show a fourth embodiment of the present invention. FIG. 14 is a view as seen from the exit surface side of the surface light source, and FIG. 15 is an enlarged view omitting hatching along the XV-XV line of FIG. It is sectional drawing.

  The surface light source 15c of this embodiment changes the direction of incident light and emits it toward the liquid crystal display panel 1 shown in FIGS. 1 and 2 as the second embodiment shown in FIGS. The light guide plate 16a is provided on the outside of the incident surface 17a formed on one of the two long sides of the light guide plate 16a, for example, the lower side corresponding to the lower edge of the screen of the liquid crystal display panel 1. The condenser lens array 31 having a plurality of condenser lens portions 32 arranged in the length direction of the incident surface 17a, and the plurality of condensers on the opposite side of the condenser lens array 31 from the side facing the light guide plate 16a. A light source unit 30 including a plurality of first and second solid state light emitting elements 33a and 33b disposed to face the optical lens unit 32 is disposed.

  The condensing lens array 31 includes a plurality of condensing lens portions 32 arranged in the length direction of the incident surface 17a of the light guide plate 16a, out of the light incident from the side opposite to the side facing the light guide plate 16a. Light incident on one of the left and right regions from the center of the condensing lens portion 32 is condensed and left or right when viewed from the liquid crystal display panel 1 side with respect to the vertical direction of the screen of the liquid crystal display panel 1. First light having directivity in which a light intensity peak exists in an inclined direction is emitted toward the incident surface 17 of the light guide plate 16a, and light incident on the other region of the condenser lens portion 32 is emitted. Condensing and emitting second light having directivity in which a light intensity peak exists in a direction inclined to the other side with respect to the vertical direction toward the incident surface 17 of the light guide plate 16a, A plurality of condenser lens portions of the condenser lens array 31 2 consists of the exit surface facing the light guide plate 16a and the circular lens portion formed on a cylindrical surface the incident surface of the opposite side around the center portion of the condenser lens unit 32.

  A part of the light incident from the incident surfaces of the plurality of condensing lens portions 32 is internally reflected by the end surfaces on both end surfaces of the condensing lens array 31 and becomes either stray light. A light absorption film 33 is provided to prevent the light from exiting from the exit surface of the lens portion 32.

  The first and second solid state light emitting elements 34a and 34b of the light source unit 30 are not shown in structure, but are formed by molding LEDs (light emitting diodes) with a transparent resin. 34b also emits light with a certain degree of divergence without directivity from its exit surface.

  The surface light source 15c of this embodiment displays a stereoscopic color image on the liquid crystal display panel 1 by field sequential display, and the first and second solid state light emitting devices 34a and 34b respectively emit red light. A red LED that emits light, a green LED that emits green light, and a blue LED that emits blue light, and selectively emits light of three colors of red, green, and blue.

  The first and second solid state light emitting devices 34a and 34b are arranged on the opposite side of the condenser lens array 31 from the side facing the light guide plate 16a, and the one of the plurality of condenser lens portions 32 is disposed on the opposite side. An emission surface of the first solid-state light emitting element 34a is opposed to a region, for example, a region on the right side when viewed from the liquid crystal display panel 1 side with respect to the center of the condenser lens unit 32, and the plurality of condenser lens units 32 are arranged. The light emitting surface of the second solid state light emitting element 34b is arranged to face the other region, that is, a region on the left side when viewed from the liquid crystal display panel 1 side with respect to the center of the condenser lens portion 32.

  FIG. 16 is a light ray diagram schematically showing a light emission path from the light source unit 30 of the surface light source 15c, and is opposed to a region on the right side of the incident surface of the plurality of condensing lens units 32 of the condensing lens array 31. The first light from the first solid-state light emitting element 34a arranged in such a manner is condensed by the condenser lens portion 32 and emitted from the condenser lens portion 32, as indicated by an arrow in the figure. From the left side of the surface (left side when viewed from the liquid crystal display panel 1 side), the light intensity peak is in a direction inclined to the left side when viewed from the liquid crystal display panel 1 side with respect to the vertical direction of the screen of the liquid crystal display panel 1. The light having the directivity is emitted toward the incident surface 17a of the light guide plate 16a, and is opposed to the region on the left side of the incident surfaces of the plurality of condensing lens portions 32 of the condensing lens array 31. From the arranged second solid state light emitting device 34b As shown by the broken line in the figure, the light 2 is collected by the condenser lens unit 32, and is on the right side (right side as viewed from the liquid crystal display panel 1 side) of the exit surface of the condenser lens unit 32. From the region, the light guide plate 16a becomes light having directivity in which a peak of light intensity exists in a direction inclined to the right when viewed from the liquid crystal display panel 1 side with respect to the vertical direction of the screen of the liquid crystal display panel 1. The light exits toward the incident surface 17a.

  FIG. 17 shows the light intensity distribution of the light emitted from the light source unit 30 toward the incident surface 17a of the light guide plate 16a, and the solid line indicates the light of the first light from the first solid state light emitting device 34a. The broken line shows the light intensity distribution of the second light from the second solid state light emitting device 34b. In FIG. 17, the negative angle is the leftward angle when viewed from the liquid crystal display panel 1 side with respect to the vertical direction of the screen of the liquid crystal display panel 1, and the positive viewing angle is viewed from the liquid crystal display panel 1 side. The angle in the right direction.

  The light guide plate 16a changes the direction of the first light emitted from the light source unit 30 and incident on the light guide plate 16a from the incident surface 17 in the same manner as in the second embodiment described above. The left-eye illumination light having directivity in which the peak of the emitted light intensity exists in the direction inclined to the left eye direction of the display observer with respect to the normal line of the liquid crystal display panel 1 is emitted from the light source unit 30. Then, the direction of the second light incident on the light guide plate 16a from the incident surface 17 is changed, and the emitted light is inclined in the direction of the right eye of the display observer with respect to the normal line of the liquid crystal display panel 1. Right-eye illumination light having directivity in which an intensity peak exists is emitted.

  The surface light source 15c of this embodiment has a plurality of condensing lens portions 32 arranged in the length direction of the incident surface 17a outside the incident surface 17a of the light guide plate 16a. Of the light incident from the side opposite to the side facing the light guide plate 16a, the light incident on one of the left and right regions with respect to the center of the condensing lens portion 32 is condensed to the liquid crystal display panel 1. Incident surface 17a of light guide plate 16a emits first light having directivity in which a light intensity peak exists in a direction inclined to either the left or right when viewed from the liquid crystal display panel 1 side with respect to the vertical direction of the screen. The light having a directivity in which the light that is emitted toward the other side of the condenser lens portion 32 is condensed and the light intensity peak exists in a direction inclined to the other with respect to the vertical direction. 2 light is directed toward the incident surface 17a of the light guide plate 16a. The condensing lens array 31 to be emitted and the one side and the other side of the plurality of condensing lens portions 32 on the opposite side of the condensing lens array 31 from the side facing the light guide plate 16a, respectively. The plurality of first and second solid state light emitting devices 34a and 34b are arranged so as to face each other and emit light toward the one region and the other region of the condenser lens portion 32. Therefore, the inexpensive solid light emitting elements 34a and 34b that emit light having no directivity are used, and the light from the first and second solid light emitting elements 34a is converted into the condensing lens portion of the condensing lens array 31. As a first light having directivity in which a light intensity peak exists in a direction inclined to either the left or right when viewed from the liquid crystal display panel 1 side with respect to the vertical direction of the screen of the liquid crystal display panel 1. The light guide plate 16 And directing light from the other solid-state light emitting element 34b to a light intensity peak in a direction inclined to the other with respect to the vertical direction by the condenser lens portion 32 of the condenser lens array 31. The second light is incident on the light guide plate 16a, and the left-eye illumination light and the right-eye illumination light can be emitted from the light guide plate 16a.

  In this embodiment, the plurality of condensing lens portions 32 of the condensing lens array 31 are circular lenses in which the exit surface facing the light guide plate 16a and the incident surface on the opposite side are formed in a cylindrical surface. Therefore, the light from the first and second solid state light emitting elements 34a and 34b is incident on the light guide plate 16a as the first and second light beams having the directivity and the same intensity, and from the light guide plate 16a. The left-eye illumination light and the right-eye illumination light having sufficient directivity and the same intensity are emitted, and the liquid crystal display panel 1 has a high luminance balance between the left-eye image and the right-eye image. A quality stereoscopic image can be displayed.

  In this embodiment, the light incident surface 17a is formed on one of the two long side portions of the light guide plate 16a and the light source unit 30 is disposed on the outside thereof. However, the two long sides of the light guide plate 16a are provided. The incident surface 17a may be formed on both of the portions, and the light source unit 30 may be disposed outside each of the incident surfaces 17a. Further, the incident light 17 may be changed in direction and emitted to the liquid crystal display panel 1 side. The directing means is not limited to the light guide plate 16a, and may be constituted by the prism sheet 23 and the reflection plate 26 shown in FIGS.

(Fifth embodiment)
18 to 21 show a fifth embodiment of the present invention. FIG. 18 is a view as seen from the exit surface side of the surface light source. FIG. 19 is an enlarged view of FIG. 18 where hatching along the line IXX-IXX is omitted. It is sectional drawing.

  The surface light source 15d of this embodiment is a light source section provided with a condensing lens array 31a having a plurality of condensing lens sections 32a made of elliptic lenses, instead of the light source section 30 of the surface light source 15c of the fourth embodiment described above. 30a is replaced, and the other structure is the same as the surface light source 15c of the fourth embodiment.

  That is, the surface light source 15d of this embodiment is one of two long sides of the light guide plate 16a of the second embodiment shown in FIGS. 8 to 10, for example, the lower edge of the screen of the liquid crystal display panel 1. The exit surface facing the light guide plate 16a is formed as an elliptical cylindrical surface outside the entrance surface 17a formed on the lower side corresponding to the surface, and the opposite entrance surface is substantially the same as the entrance surface 17a of the light guide plate 16a. A condensing lens array 31a having a plurality of condensing lens portions 32a made of elliptical lenses formed on linear parallel planes, and a side opposite to the side facing the light guide plate 16a of the condensing lens array 31a In addition, a plurality of first and first light beams are disposed opposite to the plurality of condensing lens portions 32 and emit light having no directivity toward the incident surface (straight surface) of the plurality of condensing lens portions 32. Two solid state light emitting devices 33a and 33b; The first solid-state light emitting device 34a has an emission surface thereof from one region of the plurality of condensing lens portions 32a, for example, from the center of the condensing lens portion 32a. Is disposed opposite to the region on the right side when viewed from the liquid crystal display panel 1 side, and the second solid state light emitting element 34b has its exit surface on the other region of the plurality of condensing lens portions 32a, that is, It is arranged so as to face a region on the left side when viewed from the liquid crystal display panel 1 side with respect to the center of the condenser lens portion 32a. A light absorbing film 33 is provided on each end face of the condenser lens array 31a.

  FIG. 20 is a ray diagram schematically showing a light emission path from the light source unit 30a of the surface light source 15d, and shows incident surfaces of a plurality of condensing lens units 32a composed of elliptic lenses of the condensing lens array 31a. The first light from the first solid state light emitting element 34a arranged to face the right region is condensed by the condenser lens portion 32a as shown by the arrow in the figure, and this light is condensed. From a region on the left side (left side when viewed from the liquid crystal display panel 1 side) of the exit surface of the lens portion 32a, in a direction inclined to the left side when viewed from the liquid crystal display panel 1 side with respect to the vertical direction of the screen of the liquid crystal display panel 1. Light having directivity in which a peak of light intensity exists is emitted toward the incident surface 17a of the light guide plate 16a, and is on the left side of the incident surfaces of the plurality of condensing lens portions 32a of the condensing lens array 31a. Placed opposite the area The second light from the second solid state light emitting element 34b is condensed by the condenser lens portion 32a as shown by the broken line in the figure, and is on the right side of the exit surface of the condenser lens portion 32a ( Directivity in which a light intensity peak exists in a direction tilted to the right when viewed from the liquid crystal display panel 1 side with respect to the vertical direction of the screen of the liquid crystal display panel 1 from the region on the right side when viewed from the liquid crystal display panel 1 side. Is emitted toward the incident surface 17a of the light guide plate 16a.

  FIG. 21 shows the light intensity distribution of the light emitted from the light source unit 30a toward the incident surface 17a of the light guide plate 16a, and the solid line indicates the light of the first light from the first solid state light emitting device 34a. The broken line shows the light intensity distribution of the second light from the second solid state light emitting device 34b. In FIG. 21, the negative angle is the leftward angle when viewed from the liquid crystal display panel 1 side with respect to the vertical direction of the screen of the liquid crystal display panel 1, and the positive viewing angle is viewed from the liquid crystal display panel 1 side. The angle in the right direction.

  In the surface light source 15d of this embodiment, a plurality of condensing lens portions 32a of the condensing lens array 31a of the light source portion 30a are formed such that the exit surface facing the light guide plate 16a is an elliptical cylindrical surface, and the opposite side. Since the incident surface is an elliptical lens formed on a linear surface substantially parallel to the incident surface 17a of the light guide plate 16a, the light from the first and second solid state light emitting devices 34a and 34b is received. 21 can be made incident on the light guide plate 16a as first and second lights having high directivities and equal intensities as shown in FIG. 21, and therefore has high directivity from the light guide plate 16a and high intensity. The same left-eye illumination light and right-eye illumination light are emitted, and a higher-quality stereoscopic image can be displayed on the liquid crystal display panel 1.

(Other embodiments)
In addition, the liquid crystal display device of the present invention can display not only a stereoscopic color image but also a planar color image in a field sequential manner. In this case, red, green, blue for one of the left and right eyes is used. Unit 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 the unit color image data is 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 inserted may be emitted from the surface light sources 15, 15a, 15b, 15c, and 15d 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 the left eye is transmitted from the surface light sources 15, 15a, 15b, 15c, and 15d. The white left-eye illumination light may be emitted in synchronization with the writing of the image data for white, and the white illumination light for white eye may be emitted in synchronization with the writing of the image data for the right eye.

  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.

1 is an exploded perspective view of a liquid crystal display device showing a first embodiment of the present invention. The figure seen from the upper side of the liquid crystal display. FIG. 3 is a cross-sectional view of a part of a liquid crystal display panel. The figure seen from the output surface side of the surface light source of the said liquid crystal display device. The figure seen from the upper side of the surface light source. The expanded sectional view which abbreviate | omitted hatching along the VI-VI line of FIG. FIG. 3 is a light ray diagram schematically illustrating a path along which first light and second light reflected by a reflection surface of a light guide plate of the surface light source travel. The figure seen from the output surface side of the surface light source which shows 2nd Example of this invention. The expanded sectional view which abbreviate | omitted hatching along the IX-IX line of FIG. The figure which shows typically the reflective state of the 1st light and the 2nd light in the reflective surface of the light-guide plate of the surface light source of a 2nd Example. The figure seen from the output surface side of the surface light source which shows the 3rd Example of this invention. The expanded sectional view which abbreviate | omitted the hatching along the XII-XII line | wire of FIG. The light ray figure which shows typically the path | route which the 1st light and 2nd light which were refracted | refracted by the prism sheet of the redirecting means of the surface light source of a 3rd Example follow. The figure seen from the output surface side of the surface light source which shows 4th Example of this invention. The expanded sectional view which abbreviate | omitted hatching along the XV-XV line | wire of FIG. The light ray figure which shows typically the radiation | emission path | route of the light from the light source part of the surface light source of a 4th Example. The light intensity distribution figure of the light radiate | emitted from the light source part of the surface light source of a 4th Example. The figure seen from the output surface side of the surface light source which shows 5th Example of this invention. The expanded sectional view which abbreviate | omitted the hatching which followed the IXX-IXX line | wire of FIG. The light ray figure which shows typically the radiation | emission path | route of the light from the light source part of the surface light source of a 5th Example. The light intensity distribution figure of the light radiate | emitted from the light source part of the surface light source of a 5th Example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display panel, 1a ... Screen area | region, 15, 15a, 15b, 15c, 15d ... Surface light source, 16, 16a ... Light guide plate (direction changing means), 17, 17a ... Incident surface, 18, 18a ... Output surface, DESCRIPTION OF SYMBOLS 19, 19a ... Reflecting surface, 20, 20a ... Elongated groove, 16c ... Diverting means, 23 ... Prism sheet, 24 ... Outgoing surface, 25 ... Elongate prism, 26 ... Reflecting plate, 27 ... Incident part, 28 ... Light source part, 29a, 29b ... solid light emitting element, 30, 30a ... light source part, 31, 31a ... condensing lens array, 32, 32a ... condensing lens part, 34a, 34b ... solid light emitting element, 35 ... control means.

Claims (9)

It has a horizontally long rectangular screen area in which a plurality of pixels are arranged in a matrix, and left-eye image data and right-eye image data for observing with the left and right eyes are selectively selected in the plurality of pixels. A liquid crystal display panel that selectively displays a left-eye image and a right-eye image according to the left-eye and right-eye image data,
The liquid crystal display panel is disposed so as to face the surface opposite to the observation side, has a horizontally long rectangular outer shape corresponding to the screen shape of the liquid crystal display panel, and upper and lower edges of the screen of the liquid crystal display panel. An incident part for making light incident on at least one of the two substantially parallel long sides is formed, the direction of incident light incident from the incident part is changed, and the light is parallel to the normal line of the liquid crystal display panel. And the direction change means which radiate | emits to the said liquid crystal display panel side with the output angle according to the inclination angle to the left-right direction with respect to the said up-down direction with respect to the said up-down direction with respect to the surface along the up-down direction of the screen of the said liquid crystal display panel, The light intensity peak is arranged in a direction inclined to either the right or left when viewed from the liquid crystal display panel side with respect to the vertical direction toward the incident portion. No. with the existing directivity And a light source unit that selectively emits second light having directivity in which a light intensity peak exists in a direction inclined to the other side with respect to the vertical direction, and from the light source unit Direction in which one of the first and second lights is guided by the deflecting means and a peak of the emitted light intensity exists in a direction inclined in the direction of the left eye of the display observer with respect to the normal line of the liquid crystal display panel. The left-eye illumination light having a characteristic is emitted, the other of the first and second lights from the light source unit is guided by the turning means, and the display observation is performed with respect to the normal line of the liquid crystal display panel. A surface light source for 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 person,
The left-eye image data and right-eye image data are selectively written to a plurality of pixels of the liquid crystal display panel, and the left-eye illumination light is transmitted from the surface light source in synchronization with the writing of the left-eye image data. And a control means for emitting the right-eye illumination light from the surface light source in synchronization with the writing of the left-eye image data.   The surface light source redirecting means transmits light into the transparent member on at least one of two long sides substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel, of the peripheral surface of the rectangular plate-shaped transparent member. Is formed, an emission surface for emitting light is formed on the plate surface facing the liquid crystal display panel, and the incident surface is formed on the opposite plate surface. 2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device comprises a light guide plate having a reflection surface for reflecting light incident from a surface toward the emission surface.   The surface light source changing means has an emission surface for emitting light on a surface facing the liquid crystal display panel, and a plurality of elongated prisms along the horizontal direction of the screen of the liquid crystal display panel are parallel to each other on the opposite surface. A rectangular prism sheet formed on the prism sheet, and a rectangular reflecting plate facing the prism forming surface of the prism sheet with a space therebetween, out of the periphery of the space between the prism sheet and the reflecting plate 2. An incident portion for allowing light to enter the space is formed on at least one of two long side portions substantially parallel to the upper and lower edges of the screen of the liquid crystal display panel. The liquid crystal display device described.   The light source unit of the surface light source is composed of a plurality of solid state light emitting elements that emit light having directivity in which a light intensity peak exists in one direction, and the plurality of solid state elements are disposed outside the incident part of the direction changing unit. The light emitting elements are directed so that the light emission direction of half of the first solid state light emitting elements is inclined to either the left or right when viewed from the liquid crystal display panel side with respect to the vertical direction of the screen of the liquid crystal display panel. The liquid crystal according to any one of claims 1 to 3, wherein the light emission direction of half of the second solid-state light emitting elements is arranged in a direction inclined to the other with respect to the vertical direction. Display device.   An incident portion for allowing light to enter each of the two long side portions of the deflecting means is formed, and a first solid-state light emitting element is arranged outside the one incident portion in the length direction thereof, 5. The liquid crystal display device according to claim 4, wherein the second solid-state light emitting elements are arranged outside the other incident portion in the longitudinal direction.   5. The liquid crystal display device according to claim 4, wherein the first solid-state light-emitting element and the second solid-state light-emitting element are alternately arranged in the length direction outside the incident portion of the deflecting unit.   The light source unit of the surface light source has a plurality of condensing lens units arranged outside the incident unit of the diverting unit and arranged in the length direction of the incident unit, and the condensing lens unit is provided with the diverting unit. Of the light incident from the opposite side to the opposite side, the light incident on one of the left and right regions from the center of the condensing lens portion is condensed to the vertical direction of the screen of the liquid crystal display panel. The condensing lens emits first light having directivity having a light intensity peak in a direction inclined to either the left or right when viewed from the liquid crystal display panel side, toward the incident portion of the redirecting means. The light incident on the other region of the light is condensed and the second light having directivity in which the light intensity peak exists in a direction inclined to the other with respect to the vertical direction is incident on the incident portion of the redirecting means. A condensing lens array that emits light toward the surface, and facing the direction changing means of the condensing lens array On the opposite side to the one side and the other region of the plurality of condensing lens portions, respectively, and to the one region and the other region of these condensing lens portions. The liquid crystal display device according to claim 1, comprising a plurality of first and second solid state light emitting elements that emit light toward the surface.   8. The plurality of condensing lens portions of the condensing lens array comprises a circular lens in which an exit surface facing the deflecting means and an entrance surface opposite to the exit surface are formed on a cylindrical surface. The liquid crystal display device described.   In the plurality of condensing lens portions of the condensing lens array, the exit surface facing the deflecting means is formed as an elliptic cylindrical surface, and the incident surface on the opposite side is a straight line substantially parallel to the incident portion of the deflecting means. The liquid crystal display device according to claim 7, comprising an elliptical lens formed on a surface.

Images