JP4504008B2 - Video display device - Google Patents

Description

  The present invention relates to a video display device, and more particularly to a video display device capable of observing a video corresponding to a viewing direction on a single display screen.

  2. Description of the Related Art Conventionally, there has been known an image display device that can observe an image corresponding to a viewing direction on one display screen. In particular, there is a stereoscopic display device using matrix illumination and lenticular as disclosed in Japanese Patent No. 3072866 as a technique for switching the directivity of illumination in a time division manner. In this case, a lenticular is arranged in a matrix-like backlight, and directivity is switched in a time division manner to realize a stereoscopic display.

  Japanese Patent Laid-Open No. 8-194273 discloses a technique for providing an optimal observation condition to an observer by shifting the lenticular pitch and the light source pitch to shift the positional relationship between the lenticular pitch and the light source toward the periphery. There is.

  12A and 12B show a conventional configuration when time-division illumination is performed by combining a split light source such as a stripe light source or a matrix light source with a lenticular. FIG. 12A shows that the light source only on the R side is turned on, and FIG. 12B shows that the light source only on the L side is turned on.

  A plurality of light sources L1, R1, L2, R2, L3, and R3 constituting the light source group 99 are linearly arranged at predetermined intervals. A plurality of lenses 101 to 103 constituting the lenticular 100 are arranged with a certain distance from the light source group 99. Here, one lens 101, 102 or 103 as an optical element unit constituting the lenticular 100 and two light sources closest to the one lens 101, 102 or 103 (the light source L1, R1 if the lens 101, the lens 102). For example, the units composed of the light sources L2 and R2 and the light source L3 and R3 in the case of the lens 103 are referred to as illumination units 1, 2, and 3, respectively.

  In the conventional configuration, as shown in FIGS. 12A and 12B, a light beam from a light source included in an illumination unit to which the lens 101, 102, or 103 of the lenticular 100 belongs is incident. ing. For example, in the lens 102 and the light sources L2 and R2 constituting the illumination unit 2, the light beams from the light sources L2 and R2 enter the lens 102 belonging to the illumination unit 2 that is the same illumination unit.

In other words, the light beam incident on the lens 102 as the optical element unit included in the illumination unit 2 becomes a light beam from the light sources R2 and L2 included in the illumination unit 2 which is the same illumination unit. Thus, the distance between the two light sources R2 and L2 is smaller than the lens width or lens pitch of the lens 102.
Japanese Patent No. 3072866 JP-A-8-194273

  In a time-division illumination type stereoscopic display device such as Japanese Patent No. 3072866 using a conventional matrix or stripe light source and a lenticular optical system, when one lens of a lenticular is focused, The interval between the light sources was arranged narrower than the lens pitch. Although such an arrangement is sufficient for a stereoscopic display device, there is an application in which a video corresponding to the viewing direction is presented to two or more viewers on a single display screen. In the case where large separation is required, it is necessary to shorten the distance between the lens and the light source. For this reason, it is necessary to shorten the focal length of each lens and to reduce the radius of curvature. However, this increases the influence of optical aberrations and the like, which causes observation of uneven illumination. It was.

  The present invention has been made paying attention to such a problem, and an object of the present invention is to provide an image display device that can reduce the influence of optical aberrations and suppress the occurrence of uneven illumination. Is to provide.

In order to achieve the above object, a first invention is a video display device having a single display screen capable of displaying a plurality of videos in respective directions corresponding to the videos. The illuminating means for emitting the first light flux and the second light flux in at least two different directions, the first image using the first light flux emitted from the illuminating means as a light source, and the second light flux. A transmissive display element capable of displaying a second image as a light source in a time-sharing manner, and the illuminating means comprises:
A plurality of light sources capable of selective light emission in a time-sharing manner, and an optical device arranged so as to face the plurality of light sources, and that emits light beams emitted from light sources at different positions and emits them in directions corresponding to the respective positions. A plurality of illumination units including element units are arranged and selected toward the optical element unit of the one illumination unit for emitting the first light flux and the second light flux. Each light source to be emitted is a light source included in another illumination unit different from the one illumination unit.

  According to a second aspect, in the video display device according to the first aspect, the other illumination unit is an illumination unit arranged adjacent to the one illumination unit.

  Further, a third invention is the video display device according to the second invention, wherein the light source included in the other illumination unit is included in the other illumination unit so as to face the optical element of the one illumination unit. The light source is tilted.

  According to a fourth aspect of the present invention, in the video display device according to the first, second, or third aspect, an assembly of the optical element units having a periodic structure configured by arranging a plurality of the optical element units in the arrangement direction. Is a lenticular lens, in order to emit the first light flux and the second light flux, the distance between the light sources emitted toward one lens in the lenticular lens is determined from the lens pitch in the lenticular lens. Also make it bigger.

  According to a fifth aspect of the present invention, in the video display device according to the fourth aspect of the invention, the lenticular lens has a lenticular lens structure on both sides, and the lens pitch of the light source side surface is set to the transmissive display element side. A half pitch is shifted from the lens pitch of the surface.

  According to a sixth aspect of the present invention, in the video display device according to any one of the first to fifth aspects of the present invention, when the video display device is installed in an in-car central portion and used as an in-vehicle video display device, By setting the separation angle between the optical axis of the first luminous flux and the optical axis of the second luminous flux to approximately 25 degrees to approximately 35 degrees on the left and right in the substantially horizontal direction around the normal line of the display screen, A viewer on the seat side can observe the first image, and an observer on the passenger seat side can observe the second image.

  The seventh invention is a video display device having a single display screen capable of displaying a plurality of videos in the respective directions corresponding to the videos, in at least two different directions by time division. Illumination means for emitting a first light flux and a second light flux, a first image using the first light flux emitted from the illumination means as a light source, and a second image using the second light flux as a light source And a transmissive display element capable of displaying time-division, wherein the illuminating means is arranged in a time-division manner so as to selectively emit light, and is arranged opposite to the plurality of light sources, and light sources at different positions. A plurality of illumination units each including an optical element unit that emits the light beams emitted from each of the light beams and emits the light beams in directions corresponding to the respective positions, and includes the first light beam and the first light beam. One illumination to emit two luminous fluxes Position of the distance between the light source is selected emission toward the optical element unit, larger than the arrangement interval of the lighting unit.

  ADVANTAGE OF THE INVENTION According to this invention, the image display apparatus which can reduce the influence of an optical aberration and can suppress generation | occurrence | production of illumination nonuniformity is provided.

  First, an outline of the present embodiment will be described. In this embodiment, when each lens of the lenticular lens and the two light sources closest thereto are defined as the illumination unit, the illumination is conventionally performed using the light source in the illumination unit. By using a light source for illumination, the distance between the lens and the light source can be increased. As a result, since the focal length of the lens becomes long, the radius of curvature of the lens can be increased. As a result, the influence of optical aberration can be reduced, and the occurrence of illumination unevenness can be suppressed. Further, since the lenticular is used on both sides and the lens pitch is shifted by approximately half a pitch between the lenticular on the display element side and the lenticular on the light source side, the optical aberration is further reduced, so that illumination without unevenness can be obtained. Further, the normal direction of the light emitting surface of the light source is made to substantially coincide with the center of the lens in the adjacent illumination unit.

  Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing an embodiment of a video display device of the present invention. A first observer 12-1 who observes the display screen 10 from the left side is located in front of the right side of one display screen 10, and a second observer 12 who observes the display screen 10 from the right side in front of the display screen 10. -2 is located. The first observer 12-1 is located in the first image observation range 11-1, so that the first image is displayed. The second observer 12-2 is located in the second image observation range 11-2. Therefore, both can observe the second video at the same time.

  Here, in practice, the first video is displayed in the first field of the display screen 10 and the second video is alternately displayed in a time-division manner in the second field by raster scanning, but the display is switched at high speed. Because of the afterimage effect of the human eye, the viewer recognizes each as a continuous image.

  FIG. 2 is a diagram showing a basic configuration of the video display device of the present invention, in which a light emitting area dividing light source 20, a light directivity separating optical element 21, a light diffusing element 22, and a transmissive display element 23 such as an LCD are shown. Are arranged in order. Here, the light emitting area dividing light source 20, the light directivity separating optical element 21, and / or the light diffusing element 22 constitute an illuminating means.

  The light emitting area divided light source 20 has its light emitting area divided into a plurality of areas, and each area can be turned on and off. Any area can be used as long as the light emitting area is divided and the light emitting area can be switched in a time division manner. For example, a stripe light source using a light guide or a matrix light source in which LEDs are arranged can be considered.

  The light directivity separating optical element 21 is an element having directivity for outputting light emitted from each region of the light emitting region dividing light source 20 in a specific different direction. Specific examples include a lenticular, a lens array, a diffraction element, a hologram element, and a prism sheet.

  The light diffusing element 22 is an element for reducing illumination unevenness. Any light diffusing element may be used, and a diffusing plate, a diffractive element, a prism sheet, and the like are conceivable. As shown in the figure, the light diffusing element 22 is provided between the light directivity separating optical element 21 and the transmissive display element 23, or provided between the light emitting area dividing light source 20 and the light directivity separating optical element 21. It is done. At this time, since the images are separated so as to have two directivities in the horizontal direction, if the diffusion in the horizontal direction is too strong, the two images may be mixed and appear as a double image. . In this case, it is preferable to use a light diffusing element having a lower horizontal diffusion characteristic than a vertical diffusion characteristic.

  FIGS. 3A and 3B are diagrams showing a combination of a striped light source or matrix light source as the light emitting region dividing light source 20 and a lenticular as the light directivity separating optical element 21. FIG. 3A shows that the light source only on the R side is turned on, and FIG. 3B shows that the light source only on the L side is turned on.

  A plurality of light sources L1, R1, L2, R2, L3, and R3 constituting the light source group 99 are linearly arranged at predetermined intervals. Note that these light sources L1, R1, L2, R2, L3, and R3 may be self-luminous light sources or secondary light sources guided by a light guide plate or the like.

  A plurality of lenses 101 to 103 constituting a lenticular with a certain distance from the light source group 99 are arranged. Here, one lens 101, 102 or 103 as an optical element unit constituting the lenticular and two light sources closest to the one lens 101, 102 or 103 (the light source L1, R1 if the lens 101, the lens 102) In the case of the light sources L2 and R2 and the lens 103, the units composed of the light sources L3 and R3) will be referred to as illumination units 1, 2, and 3, respectively. Furthermore, the illumination units may be integrated with each other, or may be configured separately.

  In the configuration of the present embodiment, as shown in FIGS. 3A and 3B, each lens 101, 102 or 103 of the lenticular is supplied from a light source included in another illumination unit different from the illumination unit to which the lens belongs. A light beam is incident. For example, in the lens 101 and the light sources L1 and R1 constituting the illumination unit 1, the light beam from the light source L1 is incident on the lens 102 included in the illumination unit 2 that is another illumination unit. Further, in the lens 102 and the light sources L2 and R2 constituting the illumination unit 2, the light flux from the light source R2 is incident on the lens 101 included in the illumination unit 1 which is another illumination unit, and the light flux from the light source L2 is other. It is incident on the lens 103 included in the illumination unit 3 that is the illumination unit. Further, in the lens 103 and the light sources L3 and R3 constituting the illumination unit 3, the light beam from the light source R3 is incident on the lens 102 included in the illumination unit 2 which is another illumination unit.

  In other words, for example, a light beam incident on the lens 102 as an optical element unit included in the illumination unit 2 is included in the light source R3 included in the illumination unit 3 that is another illumination unit and the illumination unit 1 that is another illumination unit. It becomes a light beam from the light source L1. Thus, the distance between the two light sources R3 and L1 is larger than the arrangement interval of the illumination units, that is, the lens width or lens pitch of the lens 102. At this time, light sources R2 and L2 corresponding to the lens 102 are disposed between the light sources R3 and L1.

  A light beam incident on the lens 101 as an optical element unit included in the illumination unit 1 becomes a light beam from the light source R2 included in the illumination unit 2 that is another illumination unit and the light source L0 included in the other illumination unit. . Thus, the distance between the two light sources R2 and L0 is larger than the arrangement interval of the illumination units, that is, the lens width or lens pitch of the lens 101. At this time, the light sources R1 and L1 corresponding to the lens 101 are disposed between the light sources R2 and L0. A light beam incident on the lens 103 as an optical element unit included in the illumination unit 3 becomes a light beam from the light source L2 included in the illumination unit 2 which is another illumination unit and the light source R4 included in the other illumination unit. . Accordingly, the distance between the two light sources R4 and L2 is larger than the arrangement interval of the illumination units, that is, the lens width or lens pitch of the lens 103. At this time, light sources R3 and L3 corresponding to the lens 103 are arranged between the light sources R4 and L2.

  According to the configuration described above, since the focal length can be increased and the radius of curvature of each lens can be increased, optical aberrations are suppressed to a small extent and illumination unevenness is reduced. Further, by arranging a light source corresponding to an adjacent lens between two light sources corresponding to each lens, it can be realized without disturbing the periodic structure of the lenticular and the light source.

  4 (A) and 4 (B) are diagrams showing a modification of the configuration shown in FIGS. 3 (A) and 3 (B). In this modification, in the configuration shown in FIGS. 4A and 4B described above, the light sources R1 to R3 and L1 to L3 emit light substantially matching the curvature of field of the lenses 101 to 103 constituting the lenticular 100. Each surface is inclined.

  According to the above configuration, optical aberration can be reduced, and illumination unevenness can be reduced. Moreover, since the light source surface and the optimal emission direction are substantially perpendicular, the light use efficiency is also increased.

  5 (A) and 5 (B) are diagrams showing a modification of the configuration shown in FIGS. 4 (A) and 4 (B). In this modification, by adding a lenticular 200 including lenses 201 to 204 to the configuration shown in FIGS. 4A and 4B, the lenticular 100 is disposed on the display screen side, and the lenticular 200 is disposed on the light source side. In addition, the display screen side lenses 101 to 103 and the light source side lenses 201 to 204 are shifted by approximately a half pitch. Thus, two light beams respectively emitted from the two light sources arranged side by side and passing through one lens of the lenticular 200 on the light source side pass through different lenses of the lenticular 100 on the display screen side.

  According to the configuration described above, the radius of curvature of each lens can be further increased, and the optical aberration can be reduced, so that uneven illumination can be reduced. In addition, by shifting the lens pitch on the display screen side and the lens pitch on the light source side by approximately half a pitch, the display screen side can be used for a plurality of principal rays having different angles connecting each light source and the corresponding observer. Can pass through substantially the center of the lens on the light source side and the lens on the light source side, and optical aberration can be reduced.

  FIG. 6 shows an example in which the video display device of the present invention is mounted as an in-vehicle monitor. The in-vehicle monitor 300 can observe an image according to the viewing direction on one display screen. The first image is observed in the observation range 303 of the first image, the second image is observed in the observation range 305 of the second image, and the third image is observed. In the observation range 304, the third image can be observed. Accordingly, the seat of the first observer 301 who is the assistant is arranged in the observation range 303 of the first image, and the seat of the second observer 302 who is the driver is arranged in the observation range 305 of the second image. And the driver can observe the corresponding images. For example, while providing a car navigation image and a driving assistance image to the driver, at the same time, various images such as a TV image, a DVD image, a game, and various information retrieval can be provided to the passenger in the passenger seat. As a result, even if images such as TV and movies that are restricted for viewing while driving are provided only to the passenger seat, passengers in the passenger seat can watch TV and movies even when the car is moving. You can watch the video. Preferably, as the separation angle 306 of the two images, the angle between the optical axes of the first light beam and the second light beam and the normal line of the display screen is approximately 25 degrees to approximately 35 degrees. Is preferred.

  FIG. 7 is a diagram showing another embodiment of the present invention. Here, an element other than the lenticular is used as the light directivity separation element. For example, by using a HOE (Holographic Optical Element) 400, it is possible to cause a lens action with a flat structure, and the light is emitted from light sources L0 to L3 and R1 to R4 as shown in FIG. The emitted light beam can be emitted with a specific directivity.

  Even when the HOE 400 is used, a light beam from a light source included in another illumination unit different from the illumination unit to which each lens 401, 402, or 403 of the HOE 400 belongs is incident. For example, in the lens 401 and the light sources L1 and R1 constituting the illumination unit 1, the light flux from the light source L1 is incident on the lens 402 included in the illumination unit 2 that is another illumination unit. As a result, the load of the light beam controlled by the HOE 400 is reduced, so that the occurrence of aberration can be reduced and the occurrence of illumination unevenness can be suppressed.

  According to the above configuration, even when using the HOE, illumination with a light source outside the illumination unit reduces the load of the light beam controlled by the HOE, so that the occurrence of aberration can be reduced. Generation of uneven illumination can be suppressed.

  FIG. 8 is a diagram showing still another embodiment of the present invention. Since the angles at which the right end, the center, and the left end of the display element are viewed from the observation position are different, in order to obtain a good image quality on the entire screen, it is configured by lenses 101 to 105 as light directivity separating optical elements having a periodic structure. This can be realized by slightly shifting the period of the lenticular 100 and the period of the light source group 99 composed of the light sources R1 to R6 and L1 to L5 and having a periodic structure. For example, as shown in FIG. 8, when the cycle of the light source group 99 is made larger than the cycle of the lenticular 100, the positional relationship between the lenticular 100 and the light source group 99 is shifted toward the periphery of the screen. By utilizing the deviation of the emission angles of the light beams from the light sources R1 to R6 and L1 to L5 due to this deviation, the light beams are emitted at an appropriate angle for the observer, and as a result, the image quality is improved over the entire screen. Become. In this case, the shape of each illumination unit is deformed as it goes to the periphery of the screen as shown in FIG.

  According to the configuration described above, the positional relationship between the lenticular 100 and the light source group 99 at the center of the screen and the peripheral portion of the screen is changed by slightly shifting the pitch between the lenticular 100 and the light source group 99. By configuring so that the positional relationship is optimal for both the R-side and L-side observers, illumination with less unevenness can be obtained over the entire screen.

  FIG. 9 is a diagram showing still another embodiment of the present invention. Here, as the light directivity separation element, the lenticular 100 composed of lenses 101 to 103 is disposed on the display screen side, and the light shielding portions 502, 504, 506 and the opening portions 501, 503, 505, 507 are disposed on the light source group 99 side. Are arranged periodically, and the openings 501, 503, 505, and 507 of the light shielding member 500 are arranged between the lenses of the lenticular 100 on the viewer side and lens boundaries (other lenses and lenses 101 not shown). , A boundary between the lens 101 and the lens 102, a boundary between the lens 102 and the lens 103, a boundary between the lens 103 and another lens (not shown), and the like.

  Preferably, the openings 501, 503, 505, and 507 on the light source group 99 side are also formed in a lens shape, so that the light use efficiency is increased. Preferably, the light source position and the end face position of the lenticular 100 on the display screen side have a conjugate relationship by the action of the light source side lenses 101 to 103.

  According to the configuration described above, the light source position and the vicinity of the end surface of the lenticular on the display screen side are in a conjugate relationship by the action of the light source side lens, so that the secondary side of the light source group 99 is placed at the end surface position of the lenticular on the viewer side. As a result, a transmissive display element is illuminated, so that it can be seen as if there is a planar light source immediately behind the transmissive display element, and illumination with less unevenness can be realized. Moreover, since the secondary light source produced by each light source has directivity, the image corresponding to the viewing position can be observed by illuminating with a different light source depending on the position of the observer and displaying the corresponding image.

  FIG. 10 is a diagram for explaining a prospective angle due to a difference in the positional relationship between the observation position of the observer and the left end, center, and right end of the screen. For example, the expected angle when the left end of the display screen 600 is viewed from the R-side observer position 601 is A, and the expected angle when the left end of the display screen 600 is viewed from the L-side observer position 602 is D. > D holds true. Similarly, the expected angle when the observer sees the right edge of the display screen 600 from the R-side observer position 601 is C, for example, and the expectation angle when the observer sees the right edge of the display screen 600 from the L-side observer position 602. The angle is F, and the relationship of F> C is established. For example, the prospective angle when viewing the center of the display screen 600 from the R-side observer position 601 is B, and the prospective angle when viewing the center of the display screen 600 from the L-side observer position 602 is E. In this case, the relationship B = E is established.

  As described above, the difference in the expected angle between the R side and the L side as described above is corrected by changing the size of the pitch between the observer side lenticular and the light source and changing the positional relationship between the vicinity of the center of the screen and the vicinity of the periphery. be able to.

  FIG. 11 shows a comparison between a conventional video display method and the video display method of the present invention. Here, the cross-sectional structure of illumination used for the display device when two people observe different images from different positions, particularly when assuming an in-vehicle display, is shown. FIG. 11 shows an example of light emitted from one light source that illuminates the first viewer 750 side. The first observer side 750 side is assumed to be 30 degrees from the normal 701 of the display screen.

  The configuration of the conventional example is indicated by a dotted line, and the lens 702 and two light sources R1 ′ and L1 ′ corresponding to the lens 702 are arranged in the illumination unit. For example, the light source R1 ′ emits a 30-degree light beam in two directions. In this case, the lens 702 and the light source R1 ′ must be arranged close to each other. Since the focal length of the lens 702 is reduced, the radius of curvature of the lens 702 must also be reduced. As a result, the optical aberration increases, and in particular, the light beam passing around the lens 702 is emitted at a position greatly deviated from the 30 degree direction. As a result, this is observed as illumination unevenness by the observer.

  On the other hand, the configuration shown by the solid line is the configuration according to the present invention, and the light beam from the light source L0 included in another illumination unit different from the illumination unit to which the lens 702 belongs is incident on the lens 702. . Therefore, even when a 30-degree light beam in two directions is emitted, the distance between the lens 702 and the light source L0 can be made larger than in the conventional example. Therefore, the focal length of the lens 702 can be increased, and the radius of curvature of the lens 702 can be increased as compared with the conventional example. Therefore, the optical aberration can be made smaller than that in the conventional example, and the light beam passing through the periphery of the lens can be closer to 30 degrees than in the conventional example. As a result, this is observed as a display with less illumination unevenness of the observer as compared with the conventional example.

  In FIG. 11, when the lens pitch is P and the length from the lens end surface 700 of the conventional example to the light source R1 ′ is L, the length from the lens end surface 700 to the light source L0 in the present invention is 3L, which is compared with the conventional case. Thus, it is possible to ensure a length three times as long. Further, the radius of curvature in the case of realizing in the conventional example is about P / 2, but if realized in the present invention, it is about P, and a radius of curvature of about twice is sufficient.

It is a figure which shows one Embodiment of the video display apparatus of this invention. It is a figure which shows the basic composition of the video display apparatus of this invention. It is a figure which shows the combination of the striped light source or matrix light source as a light emission area | region division | segmentation light source, and the lenticular as a light directivity separation optical element. It is a figure which shows the modification of the structure shown in FIG. It is a figure which shows the modification of the structure shown in FIG. It is a figure which shows the example at the time of mounting the video display apparatus of this invention as a vehicle-mounted monitor. It is a figure which shows other embodiment of this invention. It is a figure which shows other embodiment of this invention. It is a figure which shows other embodiment of this invention. It is a figure for demonstrating the expectation angle by the difference in the positional relationship of an observer's observation position and the left end of the screen, the center, and the right end. It is a figure which compares and shows the conventional video display method and the video display method of this invention. It is a figure which illuminates in the 1st observer direction and shows the light ray radiate | emitted from a certain one light source as an example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Display screen, 11-1 ... 1st image observation range (L side), 11-2 ... 2nd image observation range (R side), 12-1 ... 1st observer, 12-2 ... 2nd observer , 20... Light emitting region division light source, 21... Light directional separation optical element, 22... Light diffusing element, 23 .. Transmission display element, R1 to R4, L0 to L3. ˜103 ... Lens.

Claims (7)

A video display device having a single display screen capable of displaying a plurality of videos in respective directions corresponding to the videos,
Illumination means for emitting the first light flux and the second light flux in at least two different directions in a time-sharing manner;
A transmissive display element capable of displaying in a time-division manner a first image using the first light beam emitted from the illumination means as a light source and a second image using the second light beam as a light source;
Comprising
The illumination means includes
A plurality of light sources capable of selective light emission in a time-sharing manner;
A plurality of illumination units including an optical element unit that is disposed to face the plurality of light sources and that emits light beams emitted from light sources at different positions and emits the light beams in directions corresponding to the respective positions. Arrange and arrange,
In order to emit the first light flux and the second light flux, each of the light sources that selectively emit light toward the optical element unit of the one illumination unit is different from the one illumination unit. An image display device characterized by being a light source included in an illumination unit. The video display device according to claim 1, wherein the other illumination unit is an illumination unit arranged adjacent to the one illumination unit. The light source included in the other illumination unit is arranged so as to be inclined so that the light source included in the other illumination unit faces the optical element of the one illumination unit. Video display device. When an assembly of the optical element units having a periodic structure configured by arranging a plurality of the optical element units in the arrangement direction is a lenticular lens,
In order to emit the first light flux and the second light flux, a distance between light sources emitted toward one lens in the lenticular lens is made larger than a lens pitch in the lenticular lens. The video display device according to claim 1, 2, or 3. The lenticular lens has a lenticular lens structure on both sides, and the lens pitch of the light source side surface is shifted by a half pitch with respect to the lens pitch of the transmissive display element side surface. 5. The video display device according to 4. When the video display device is installed in the center of the vehicle and used as an in-vehicle video display device, the separation angle between the optical axis of the first light flux and the optical axis of the second light flux is determined by the method of the display screen. By setting the horizontal direction to about 25 degrees to about 35 degrees on the left and right in the horizontal direction, the observer on the driver's seat side displays the first image and the observer on the passenger seat side displays the second image. The video display device according to claim 1, wherein each of the video display devices is configured to be observable. A video display device having a single display screen capable of displaying a plurality of videos in respective directions corresponding to the videos,
Illumination means for emitting the first light flux and the second light flux in at least two different directions in a time-sharing manner;
A transmissive display element capable of displaying in a time-division manner a first image using the first light beam emitted from the illumination means as a light source and a second image using the second light beam as a light source;
Comprising
The illumination means includes
A plurality of light sources capable of selective light emission in a time-sharing manner;
An optical unit that is disposed opposite to the plurality of light sources and that emits light beams emitted from light sources at different positions and emits them in directions corresponding to the respective positions, and an illumination unit including:
A plurality of arrangements are configured,
In order to emit the first light flux and the second light flux, the distance between the light sources that selectively emit light toward the optical element unit of one of the illumination units is made larger than the arrangement interval of the illumination units. A video display device characterized by that.

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