JP2005018056A - Three-dimensional image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To change the position of a polarized light switching part of a light source part for liquid crystal type stereoscopic image display when an observation position moves or when there are many observation positions. <P>SOLUTION: A three-dimensional image display device is equipped with a filter provided with a 1st area which transmits specified polarized light and a 2nd area which transmits polarized light orthogonal to the specified polarized light longitudinally and repeatedly, and characterized in that a light source 201 is constituted including a light emission source 210, a polarizing means 212 of outputting its light as the specified polarized light and the polarized light orthogonal to the specified polarized light, and an optical means 203 of irradiating a liquid crystal display panel 205 by refracting those different polarized light beams to such directions that they reach the right and left eyes, respectively. The light emission source is a linear light emission source which is horizontally arranged for the liquid crystal display panel and emits linear light, and TN liquid crystal is used as a means of generating the specified polarized light and the polarized light orthogonal to the specified polarized light. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a liquid crystal type three-dimensional image display device.

  Conventional three-dimensional image display devices have a right-eye polarization filter section and a left-eye polarization filter section whose polarization directions are orthogonal to the front left and right of the light source, and each light passing through each filter section is parallelized by a Fresnel lens. The liquid crystal display element is irradiated as light, and the polarizing filters on both sides of the liquid crystal display element are alternately arranged with linear polarizing filter line portions orthogonal to each other for each horizontal line, and the light source side and the observation side are opposed to each other. The linear polarization filter line section to be orthogonalized has the orthogonal polarization direction, and the liquid crystal panel of the liquid crystal display element alternates video information for the right eye and left eye for each horizontal line according to the light transmission lines of the two polarization filters. It was the composition which is displayed in. In addition, linear polarization filter line portions orthogonal to each other are arranged alternately for each horizontal line in the light source side polarization filter, and the observation side polarization filter is linearly polarized light having one linear polarization filter line portion of the light source side polarization filter. As a filter, the liquid crystal panel of the liquid crystal display element is configured to alternately display video information for the right eye and the left eye for each horizontal line in accordance with the light transmission line of the polarizing filter on the light source side (for example, Patent Document 1).

JP-A-10-63199

  However, the above-described conventional image display device has a large number of polarizing filters and the like, and is a so-called point light source in which the light source is disposed only at the rear center of the liquid crystal panel, so that there is a difficulty in image brightness. Moreover, although the light from the light source is converted into parallel light for the left eye and parallel light for the right eye through the Fresnel lens, there is a crosstalk in which these lights overlap, making it difficult to recognize a stereoscopic image. . In addition, there is a problem that the optimum observation position of the three-dimensional image is limited to one in the front.

  It is an object of the present invention to provide a three-dimensional image display device that solves such problems.

  The gist of the present invention will be described.

According to a first aspect of the present invention, there is provided a liquid crystal display panel capable of transmitting light irradiated from the rear, a light source that irradiates the liquid crystal display panel with light having a specific polarization, and light having a polarization orthogonal to the specific polarization. A first region that is disposed between the liquid crystal display panel and the light source and transmits light of the specific polarization, and a second region that transmits light of polarization orthogonal to the light of the specific polarization, A light source that emits light whose polarization is not specified, and light that is not specified for polarization is orthogonal to the light of the specific polarization and the specific polarization. In an image display device comprising: polarization means for outputting light with polarized light; and optical means for irradiating the liquid crystal display panel with light having different polarizations refracted in directions reaching the left and right eyes The light source is the liquid crystal display panel. Against Le, a linear light-emitting source which emits light horizontally disposed linearly,
The TN liquid crystal is used as means for producing the specific polarized light and the polarized light orthogonal to the specific polarized light, and the polarization switching unit is moved in accordance with the position information on the observer side. When there are a large number of observers, a large number of polarization switching sections are provided.

  In a second aspect based on the first aspect, the linear light source is provided with a prism for increasing the luminance by narrowing the irradiation range of the light source.

  In a third aspect based on the second aspect, the linear light source comprises a plurality of point light sources arranged in a line, and the prism receives light from the point light source. A light incident surface to be emitted and a light emission surface to emit light having a light path corrected by entering from the light incident surface are provided one-on-one with respect to the point light source.

  According to a fourth invention, in the first to third inventions, the light exit surface of the prism or the light emitting source and the polarizing means are formed to be curved toward the center of the liquid crystal display panel.

  Since the present invention is configured as described above, in the first invention, TN liquid crystal is used as means for producing the light having the specific polarization and the light having the polarization orthogonal to the specific polarization. A three-dimensional image can be seen at a place other than the front of the display device. When there are a large number of observers, a large number of people can see a three-dimensional image by providing a number of polarization switching sections in accordance with the position information of each observer.

  In the second invention, in the first invention, the light source is provided with a prism for reducing the irradiation range and increasing the brightness, so that a brighter three-dimensional image can be seen from an arbitrary position.

  In the third invention, the linear light source is composed of a plurality of point light sources arranged in a line, and the prism includes a light incident surface for receiving light from the point light source, and the light incident. Since the light emitting surfaces that emit light from the surface and emit light whose light path has been corrected are provided one-on-one with respect to the point light sources, the light from the point light sources is preferably incident to the liquid crystal display. Light can be suitably emitted to the panel surface.

  In the fourth invention, the light exit surface of the prism is formed so as to bend toward the center of the liquid crystal display panel, so that the light condensing characteristic is improved and a bright three-dimensional image can be viewed from an arbitrary position.

  An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

  When the observer is in front of the image display device (FIG. 3), the polarization switching unit 212c of the TN liquid crystal 212 with the polarization filter is in the center, and the light that has passed through the right region 212a is observed by the action of the Fresnel lens 203. Focus on the left eye of the person (solid line).

  Further, the light that has passed through the left region 212b is condensed by the action of the Fresnel lens 203 on the right eye of the observer (dotted line).

  When the observer is outside the front of the image display device (FIG. 4), the polarization switching unit 212c of the TN liquid crystal 212 is shifted from the center corresponding to the position of the observer and the light that has passed through the right region 212a. Is condensed on the left eye of the observer by the action of the Fresnel lens 203 (solid line).

  Further, the light that has passed through the left region 212b is condensed by the action of the Fresnel lens 203 on the right eye of the observer (dotted line).

  When there are a large number of observers (for example, in the case of three persons in FIG. 5), the polarization switching unit 212c of the TN liquid crystal 212 with a polarizing filter becomes a large number, and light that has passed through the right region 212a of each of the three observers. Is condensed on the left eyes of three observers by the action of the Fresnel lens 203 (solid line). The light that has passed through the three left-side regions 212b is condensed on the right eyes of three observers by the action of the Fresnel lens 203 (dotted line).

  Therefore, the present invention uses a TN liquid crystal as means for producing the light having the specific polarization and the light orthogonal to the specific polarization, and provides a polarization switching unit in accordance with the position information on the viewer side. Since it can be moved, it becomes a 3D image display apparatus which can see a 3D image even in places other than the front of the image display apparatus.

  Specific embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a functional explanatory diagram of an image display apparatus according to an embodiment of the present invention.

  FIG. 2 is a schematic cross-sectional view of a TN liquid crystal with a polarizing filter.

  The light source 201 includes a light emitting source 210, a TN liquid crystal 212 with a polarizing filter (polarizing means), and a Fresnel lens 203 (optical means). As the light source 210, a white light emitting diode or the like (or a cold cathode tube or the like) arranged in the left-right direction is used. The TN liquid crystal 212 with a polarizing filter has the configuration shown in FIG. 2, and light emitted from the light source 210 passes through the polarizing filter and becomes light of a specific polarization. In the TN liquid crystal, in a portion where no voltage is applied to the liquid crystal, incident light of a specific polarization is emitted with a polarization axis shifted by 90 °. In the portion where the voltage is applied, the twist of the liquid crystal can be unwound, so that the incident light of a specific polarization is emitted in the state of the polarization axis as it is. Accordingly, the right axis 212a and the left axis 212b are set to have different polarization axes of light transmitted through the boundary portion (polarization switching unit 212c) between the portion where the voltage is not applied and the portion where the voltage is applied. The Fresnel lens 203 has a lens surface having concentric irregularities on one side.

  The light emitted from the light emitting source 210 is transmitted only by the TN liquid crystal 212 with a polarizing filter. That is, out of the light emitted from the light emitting source 210, the light passing through the right region 212a of the TN liquid crystal 212 with the polarizing filter and the light passing through the left region 212b are irradiated to the Fresnel lens 203 as differently polarized light. The As will be described later, light that has passed through the right region 212a of the TN liquid crystal 212 with polarization filter reaches the left eye of the observer, and light that has passed through the left region 212b reaches the right eye of the viewer.

  The light transmitted through 212 of the TN liquid crystal with a polarizing filter is applied to the Fresnel lens 203. The Fresnel lens 203 is a convex lens. In the Fresnel lens 203, the optical path of the light emitted so as to be diffused from the light emission source 210 is changed to a substantially convergent light, is transmitted through the fine retardation plate 204, and is irradiated onto the liquid crystal display panel 205. To do.

  At this time, light emitted from the fine retardation plate 204 is emitted so as not to spread in the vertical direction, and is applied to the liquid crystal display panel 205. That is, light transmitted through a specific region of the fine retardation plate 204 is transmitted through a specific display unit portion of the liquid crystal display panel 205.

  Of the light irradiated to the liquid crystal display panel 205, the light that has passed through the right region 212a of the TN liquid crystal 212 with polarization filter and the light that has passed through the left region 212b are incident on the Fresnel lens 203 at different angles. The light is refracted by the lens 203 and emitted from the liquid crystal display panel 205 through different paths on the left and right.

  A fine phase difference plate 204 and a polarizing plate 205a (second polarizing plate) are arranged on the light source 201 side of the liquid crystal display panel 205 (the fine phase difference plate 204 and the polarizing plate 205a (second polarizing plate) are filtered. The polarizing plate 205b (first polarizing plate) is disposed on the viewer side.

  In the fine phase difference plate 204, regions for changing the phase of transmitted light are repeatedly arranged at fine intervals. Specifically, the light-transmitting base material 230 is provided with a region 204a where the half-wave plate 231 having a fine width is provided, and the same interval as the width of the half-wave plate 231 is 1 / The region 204b where the two-wave plate 231 is not provided is repeatedly provided at a fine interval. That is, the region 204a that changes the phase of light transmitted by the provided half-wave plate 231 and the region 204b that does not change the phase of light transmitted because the half-wave plate 231 is not provided are fine. It is provided repeatedly at intervals. The portion 204b may be a region that does not change the phase of light, and even a half-wave plate can be used by adjusting the optical axis direction.

  The half-wave plate 231 is disposed so that its optical axis is inclined by 45 degrees with respect to the polarization axis of the light transmitted through the right region 212a of the TN liquid crystal 212 with polarization filter, and the polarization axis of the light transmitted through the right region 212a is 90 °. Rotate the beam and emit. That is, the polarization of the light transmitted through the right region 212a is rotated by 90 degrees so as to be equal to the polarization of the light transmitted through the left region 212b. That is, the region 204b in which the half-wave plate 231 is not provided transmits light having the same polarization as the polarizing plate 205a that is transmitted through the left region 212b, and the region 204a in which the half-wave plate 231 is provided. Light that has passed through the right region 212a and whose polarization axis is orthogonal to the polarizing plate 205a is rotated so as to be equal to the polarizing axis of the polarizing plate 205a and is emitted.

  The repetition of the optical characteristics of the fine retardation plate 204 is such that the polarization of light transmitted for each display unit (that is, for each horizontal line in the horizontal direction of the display unit) is set at substantially the same pitch as the display unit of the liquid crystal display panel 205. To be different. Therefore, the polarization characteristics of the fine phase difference plate corresponding to each horizontal line (scanning line) of the display unit of the liquid crystal display panel 205 are different, and the direction of the emitted light is different for each horizontal line.

  Thus, since it is necessary to irradiate the display element (horizontal line) of the liquid crystal display panel 205 with different light every time the optical characteristics of the fine retardation plate are repeated, the liquid crystal display panel 205 is transmitted through the fine retardation plate 204. It is necessary that the light radiated on the surface is one that suppresses diffusion in the vertical direction.

  In other words, the region 204a of the fine phase difference plate 204 that changes the phase of the light transmits the light transmitted through the right region 212a of the TN liquid crystal 212 with a polarizing filter in the same manner as the polarization of the light transmitted through the left region 212b. Further, the region 204b of the fine retardation plate 204 where the phase of the light is not changed transmits the light transmitted through the left region 212b of the polarizing filter 212 as it is. The light emitted from the fine retardation plate 204 has the same polarization as the light transmitted through the left region 212b and is transmitted from the polarizing plate 205a provided on the light source side of the liquid crystal display panel 205.

  The polarizing plate 205a functions as a second polarizing plate and has a polarization characteristic that transmits light of a specific polarization of light transmitted through the fine retardation plate 204. That is, the light that has passed through the left region 212b of the TN liquid crystal 212 with a polarizing filter passes through the second polarizing plate 205a only through the region 204b that does not change the phase of the light of the fine retardation plate 204, and the TN liquid crystal with a polarizing filter. The light transmitted through the right region 212a of 212 is transmitted through the second polarizing plate 205a with the polarization axis rotated by 90 degrees only for the light that has passed through the region 204a for changing the phase of the light of the fine phase difference plate 204. In addition, the polarizing plate 205b functions as a first polarizing plate and has a polarization characteristic that transmits light having a polarization different from that of the polarizing plate 205a by 90 degrees.

  Such a fine retardation plate 204, a polarizing plate 205a and a polarizing plate 205b are bonded to a liquid crystal display substrate 205c, and the fine retardation plate 204, a polarizing plate 205a, a liquid crystal display substrate 205c and a polarizing plate 205b are combined to form an image display device. Configure. At this time, in a state where a voltage is applied to the liquid crystal, the light transmitted through the polarizing plate 205a is transmitted through the polarizing plate 205b. On the other hand, in a state where no voltage is applied to the liquid crystal, the light transmitted through the polarizing plate 205a is not transmitted through the polarizing plate 205b because the polarized light is twisted 90 degrees and emitted from the liquid crystal display panel 205.

  Here, the left-eye image and the right-eye image are respectively displayed on the corresponding display elements of the liquid crystal display panel 205 in the region 204 a where the light phase is changed and the region 204 b where the light phase is not changed. By projecting, the observer can easily recognize a stereoscopic image by three-dimensional perception based on binocular parallax.

  The diffuser 206 is attached to the front side (observer side) of the first polarizing plate 205b and functions as a diffusing unit that diffuses light transmitted through the liquid crystal display panel in the vertical direction. Specifically, light transmitted through the liquid crystal display panel is diffused up and down using a lenticular lens in which kamaboko-shaped irregularities are repeatedly provided in the vertical direction.

  Note that a diffusing means may be provided with a mat-like diffusing surface having minute irregularities formed on the surface. The surface is provided with a large number of ellipse or ellipse-shaped minute projections arranged so that the major axis is oriented substantially in the horizontal direction to form an uneven surface, and the mat-like processing is made into an ellipse that is crushed in the lateral direction. This diffuses light strongly in the vertical direction. Further, diffusing means may be provided on both sides of the diffuser so that the light is more strongly diffused in the vertical direction. In that case, a lenticular lens and a mat-like diffusion surface may be combined as the diffusing means.

  3, 4, and 5 are explanatory diagrams of the effect of the first invention.

  When the observer is in front of the image display device (FIG. 3), the polarization switching unit 212c of the TN liquid crystal 212 with the polarization filter is in the center, and the light that has passed through the right region 212a is observed by the action of the Fresnel lens 203. Focus on the left eye of the person (solid line).

  Further, the light that has passed through the left region 212b is condensed by the action of the Fresnel lens 203 on the right eye of the observer (dotted line).

  When the observer is outside the front of the image display device (FIG. 4), the polarization switching unit 212c of the TN liquid crystal 212 is shifted from the center corresponding to the position of the observer and the light that has passed through the right region 212a. Is condensed on the left eye of the observer by the action of the Fresnel lens 203 (solid line).

  Further, the light that has passed through the left region 212b is condensed by the action of the Fresnel lens 203 on the right eye of the observer (dotted line).

  When there are a large number of observers (for example, in the case of three persons in FIG. 5), the polarization switching unit 212c of the TN liquid crystal 212 with a polarizing filter becomes a large number, and light that has passed through the right region 212a of each of the three observers. Is condensed on the left eyes of three observers by the action of the Fresnel lens 203 (solid line). The light that has passed through the three left-side regions 212b is condensed on the right eyes of three observers by the action of the Fresnel lens 203 (dotted line).

  6 and 7 are a perspective view and an exploded perspective view of the image display apparatus of the present embodiment.

  The image display apparatus 200 includes a light source body unit 250 in which a light source (linear light source) 210 is disposed in a holder 208 having a predetermined shape, a reflector (mirror) 202, a Fresnel lens 203, a fine retardation plate 204, a liquid crystal display panel. 205, a diffuser 206, and the like are assembled to the case 207.

  The light source body unit 250 is attached to the lower wall of the light source body storage portion 211 of the case 207 so that the linear light emission source 210 is disposed in the left-right direction with respect to the liquid crystal display panel 205.

  The reflecting plate 202 is attached to the upper half wall of the light source main body storage section 211 so as to be inclined so as to irradiate the Fresnel lens 203 with light from the linear light source 210.

  The linear light-emitting source 210 is arranged through the light source body unit 250 so that the linear light-emitting portion is curved toward the center of the Fresnel lens 203 and at a distance away from its focal length. (The light from the linear light source 210 and the distance from the center of the Fresnel lens 203 are routed through the reflector 202).

  On the front surface of the light source body unit 250, as will be described later, in the linear light source 210, the light from the right light emitting part 210 a is used as the polarized light for the left eye, and the light from the left light emitting part 210 b is used for the right eye. A TN liquid crystal 212 with a polarizing filter for attaching the polarized light is attached.

  The Fresnel lens 203, the fine retardation plate 204, the liquid crystal display panel 205, and the diffuser 206 are fitted in the panel frame 213 and the cover frame 214 of the case 207, and the panel frame 213 and the cover frame 214 are fixed to the light source body storage unit 211. Assembled. A light source body cover 215 is assembled to the light source body housing 211 at the lower part of the panel frame 213.

  8 and 9 are an exploded perspective view and a cross-sectional view of the light source body unit 250. FIG. The linear light source 210 is composed of a plurality of point light sources (LEDs (light emitting elements): white light emitting diodes, etc.) or elongated cold cathode tubes arranged linearly. The thing using the light emission source is demonstrated.

  The holder 208 includes storage cases 301a and 301b having a divided structure that forms the storage portion 300 so as to bend toward the center of the liquid crystal display panel, and a cover 302.

  The linear light emitting source 210 has a predetermined number of LEDs (light emitting elements: white light emitting diodes) 305 arranged in a linear manner, and a prism 306 for giving directivity to the light of the LED 305 is provided on the front surface of each LED 305. Each LED 305 is provided on a one-to-one basis. A light incident surface (described later) for entering light from the LED 305 and a light exit surface (described later) for emitting light that has entered the light incident surface and whose optical path has been corrected are paired with respect to the LED 305. Be prepared for one.

  Since the prisms 306 are provided on a one-to-one basis for each of the LEDs 305, it is possible to emit light with reduced loss of light incident on the prisms. Moreover, since the light incident surface and the light exit surface of the prism are provided one-on-one with respect to the LED 305, the light from the LED 305 can be preferably incident and the liquid crystal display panel can be preferably emitted.

  The substrate 308 in which the LEDs 305 are arranged is stored in the storage cases 301 a and 301 b of the holder 208, and the TN liquid crystal 212 with a polarizing filter is attached to the front surface of each prism body 306 via the cover 302, thereby forming the light source body unit 250. The

  The linear light source 210 is formed on the substrate 308 with the LED 305 and the prism body 306 so that the light exit surface of the prism is curved toward the center of the liquid crystal display panel 205.

  As shown in FIG. 5, the TN liquid crystal 212 with a polarizing filter can be provided with a polarization switching unit at an arbitrary position of the linear light source 210. The characteristics of the right light emitting part 210a and the left light emitting part 210b are different. The transmitted light can be transmitted.

  Although the linear light source 210 is configured as a single substrate, the substrate is divided into a linear central portion 308a substrate and a linear peripheral portion 308b substrate, and the LED 305 is linearly arranged on each substrate. The linear light emitting source 210 may be configured by arranging the plurality of linear light emitting source units in a polygonal line.

  In FIG. 8, an air inlet 320 and an air outlet 321 for air cooling are formed in the storage cases 301 a and 301 b of the holder 208. The substrate 308 is made of an aluminum substrate in order to improve heat dissipation, and a substrate having a large area is used. When the air cooling fan 222 (see FIG. 7) is driven, the air sucked from the air inlet 320 flows along the both sides of the substrate 308 from the peripheral part toward the center part and is discharged from the air outlet 321.

  10 and 11 are a perspective view and a plan view of the prism (lens body) 306 alone.

  The prism 306 is formed in a wedge shape so as to prevent the light of the LED 305 entering from the light incident surface 400 from diffusing and to emit light from the light output surface 401 with a directivity and spreading at a predetermined angle. The light incident surface 400 is a wedge-shaped front end, and the light exit surface 401 is a wedge-shaped rear end.

  As shown in FIG. 11, the prism 306 emits light that enters the LED 305 almost straight from the light exit surface 401 as it is, but light that enters at a certain angle or more (indicated by arrows) Most of the light is emitted from the light exit surface 401 in a predetermined angle range while being reflected.

  The size of each light incident surface 400 is substantially the same as or slightly larger than the size of the light emitting surface of the LED 305.

  The prism 306 has the role of increasing the luminance by narrowing the irradiation range of the LED 305 and reducing the light output area within a range not losing the light speed throughput.

  The prism has a wedge shape in which the shape of each side of the body, that is, the side surface 402 in the vertical direction (relative to the liquid crystal display panel) and the shape of the side surface 403 in the horizontal direction (relative to the liquid crystal display panel) are formed linearly (planar). However, as shown in FIG. 12, a curved surface in which the curvature of the shape of the side surface 402 is changed from the light incident surface 400 side toward the light emitting surface 401 side, for example, a curved surface of a so-called Bezier curve. May be formed.

  If the vertical side surface 402 of the prism 306 is formed on such a curved surface, as shown in FIG. 12, light incident at a relatively large incident angle (indicated by an arrow) as compared with that of the previous FIG. By the total reflection at the side surface 402 of the prism 306, the emission range is narrowed down to the range of the liquid crystal display panel, and at the same time, the light is emitted from the light exit surface 401 in the direction of a predetermined angle range in order to improve the uniformity of illumination. Accordingly, it is possible to suitably suppress the emitted light from diffusing in the vertical direction (relative to the liquid crystal display panel). It is effective to use such a curved surface on a side surface corresponding to a particularly narrow side of the liquid crystal display panel. Further, if the left and right side surfaces 403 of the prism are formed in a straight line, the emitted light can widen the viewing angle in the left and right direction (relative to the liquid crystal display panel), and at the same time, processing such as polishing is facilitated. Is possible. In general, when the light emission area is increased, the irradiation range tends to be narrowed and may be smaller than the liquid crystal panel. In order to avoid this, by controlling the ratio of the light incident / exiting area and the side surface shape, the light emitting area is increased and, at the same time, an appropriate irradiation range is maintained.

  Further, if the light exit surface is too large in the filter arrangement direction, the angular range of the light beam incident on the filter becomes large, and the light beam passes through adjacent pixels of the liquid crystal display panel, so that crosstalk increases.

  13 and 14 are a perspective view and an exploded perspective view of a light source body unit 250 of another example. The linear light emission source 210 is constituted by a plurality of point light emission sources (LEDs (light emitting elements): white light emitting diodes, etc.) arranged in a line, or an elongated cold cathode tube. However, in another example, the point light emission is performed. Explain what uses the source.

  The holder 350 includes divided storage cases 352a and 352b and a cover 353. The storage cases 352a and 352b and the cover 353 have a predetermined curvature (in this example, the focal length of the Fresnel lens 203 is a radius). An arcuate (curved) storage portion 351 is formed.

  The linear light-emitting source 210 has a predetermined number of LEDs (light-emitting elements: white light-emitting diodes) on a substrate (not shown) bent in an arc shape (curved shape) with a predetermined curvature (the focal length of the Fresnel lens 203 is a radius). Etc.) 305 are arranged in a line and attached.

  Each LED 305 is provided at equal intervals, and a prism 306 for imparting directivity to the light of the LED 305 is provided on each LED 305 on a one-to-one basis on the front surface of each LED 305.

  As shown in FIG. 10, FIG. 11, or FIG. 12, the prism 306 is formed in a wedge shape that prevents diffusion of light from the LED 305, emits light with a directivity, and spreads at a predetermined angle.

  A light source body unit 250 is formed by attaching a TN liquid crystal 212 (not shown) with a polarizing filter to the front surface of each prism via a cover 353.

  The linear light source 210 is formed in a symmetrical curve shape so that the light exit surface of each prism 306 is located at an approximately equal distance from the center of the liquid crystal display panel 205.

  According to this, the linear light emitting source 210 and the observer are arranged so that the linear light emitting portion of the linear light emitting source 210 is located at an equal distance from the center of the Fresnel lens 203 as compared with the above-described embodiment. Can be arranged so as to be a substantially conjugate position.

  Therefore, uneven brightness in the left eye zone and the right eye zone can be reliably eliminated, and a stereoscopic image can be more easily recognized.

  In this embodiment, as the linear light source 210, a plurality of point light sources (LEDs (light emitting elements): white light emitting diodes, etc.) are linearly arranged. However, a cold cathode tube or the like is used. In this case, an elongated cold cathode tube or the like may be formed in a polygonal line or a predetermined arc (curved).

  The main purpose of the Fresnel lens 203 is to focus the light flux from the central LED 305 on the position of the observer's eye, and to effectively separate the left and right regions that can be stereoscopically secured at the observation position by securing the visual field. It is. When the linear emission source 210 is linear, the condensing characteristic of the light beam incident from the peripheral portion of the linear light emission source 210 is deteriorated, which causes a reduction in light use efficiency. Since one of the causes of the deterioration of the condensing characteristic is the curvature of the image plane of the Fresnel lens 203, it can be corrected by using the curved arrangement as described above. It should be noted that the degree of curvature does not need to exactly match the curvature of field and can be set as appropriate in consideration of arrangement and manufacturing convenience.

  Therefore, uneven brightness in the left eye zone and the right eye zone can be sufficiently reduced, light can be used effectively, and a three-dimensional image can be recognized more easily.

  In addition, it should be thought that the Example disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is function explanatory drawing of the image display apparatus of the Example of this invention. 2 is a schematic cross-sectional view of a TN liquid crystal with a polarizing filter. It is effect explanatory drawing of 1st invention. It is effect explanatory drawing of 1st invention. It is effect explanatory drawing of 1st invention. It is a perspective view of the Example of this invention. It is a disassembled perspective view of the Example of this invention. It is a disassembled perspective view of a light source main body unit. It is sectional drawing of a light source main body unit. It is a perspective view of a prism simple substance. It is a top view of a prism simple substance. It is a top view (phase type) of a prism simple substance. It is a perspective view of a light source body unit (another example). It is a disassembled perspective view of a light source body unit (another example).

Explanation of symbols

201 Light source 202 Reflector (mirror)
203 Fresnel lens 204 Fine retardation plate 205 Liquid crystal display panel 206 Diffuser 207 Case 208 Holder 210 Linear light source 210a Right side light emitting part 210b Left side light emitting part 212 TN liquid crystal with polarizing filter 212a TN liquid crystal with polarizing filter (right side area)
212b TN liquid crystal with polarizing filter (left side region)
212c Polarization switching unit 212d Polarizing filter 212e TN liquid crystal panel glass substrate 212f TN liquid crystal 212g TN liquid crystal driving transparent electrode 216 Display unit 250 Light source body unit 300 Storage unit 301a, 301b Storage case 302 Cover 305 LED
306 Prism 308 Substrate 320 Intake port 321 Exhaust port 350 Holder 351 Storage unit 352a, 352b Storage case 353 Cover 400 Prism incident surface 401 Prism output surface

Claims (4)

A liquid crystal display panel capable of transmitting light irradiated from behind, a light having a specific polarization, and a light source for irradiating the liquid crystal display panel with a light having a polarization orthogonal to the specific polarization;
A first region that is disposed between the liquid crystal display panel and the light source and transmits light of the specific polarization, and a second region that transmits light of polarization orthogonal to the light of the specific polarization are vertically A filter provided repeatedly in the direction,
The light source is a light source that emits light whose polarization is not specified, and a polarization unit that outputs the light whose polarization is not specified as the light of the specific polarization and the light orthogonal to the specific polarization, and different polarizations An optical means for refracting the light in the direction of reaching the left and right eyes and irradiating the liquid crystal display panel,
The light-emitting source is a linear light-emitting source that emits light in a linear manner with respect to the liquid crystal display panel.
A three-dimensional image display device using a TN liquid crystal as means for producing the light of the specific polarization and the light of a polarization orthogonal to the specific polarization.   The three-dimensional image display device according to claim 1, wherein the linear light emitting source is provided with a prism that narrows an irradiation range of the light emitting source to increase luminance. The linear light source is composed of a plurality of point light sources arranged in a line,
The prism has a light incident surface that receives light from the point light source and a light output surface that emits light that has entered the light incident surface and the light path is corrected, respectively. The three-dimensional image display apparatus according to claim 2, wherein the three-dimensional image display apparatus is provided on a one-to-one basis. 4. The light emitting surface of the prism, or the light emitting source and the polarizing means are formed so as to bend toward the central light emitting source of the liquid crystal display panel. The three-dimensional image display device described.

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