JP3569522B2 - Display device - Google Patents

Description

  The present invention relates to a stereoscopic image display device that does not require glasses.

  In order to display a stereoscopic image without using glasses, some sort of optical action is used to converge display light rays corresponding to each directional image among the multidirectional images constituting the stereoscopic image at the position of the observer's eye, and to converge each light beam. By setting the point to be the distance between the left and right eyes of the observer (pupil distance) in the horizontal direction, when the eyes are placed at the observation position, the left and right images are autonomously separated and projected to the left and right eyes. It needs to be able to be observed as a video. In order to obtain such an optical effect, for example, a parallax barrier or a lenticular plate has been arranged between the image display device and the observer.

  However, since each directional image obtained using the parallax barrier or the lenticular plate is displayed on the (1 / direction number) portion of the display surface of the video display device, the resolution is reduced. At the same time, in the case of the parallax barrier, the brightness is reduced, and in the case of the lenticular plate, there is a limit of separation due to blur caused by lens aberration.

  In order to solve such a problem, FIG. 32 is a principle view of a conventional stereoscopic video display device disclosed in, for example, JP-A-6-205446, as viewed from above. A transmissive image display panel such as a back-illuminated liquid crystal display panel (LCD) is used, and a plurality of linear light sources are arranged on the opposite side of the LCD from the viewer. In the figure, reference numeral 1 denotes a transmissive image display panel, and 45 denotes a plurality of linear light sources. LL1 and LL2. FIG. 33 shows a temporal change of the video display area, where (a) shows video R, L for left-eye and right-eye video and video input in which video R, L is switched in field units, (b), (C) shows the time change of the video display area on the screen due to the video input of (a), (b) shows the case where the video display device is a CRT, and (c) shows the case where the video display device is an LCD. .

  In such a conventional three-dimensional image display device, when the right-eye image R-1 is displayed on the transmissive image display panel 1, only the light source LL2 for the right eye EYE2 indicated by ● in the linear light sources 45 is displayed. The light source LL1 for the left eye EYE1 which is turned on and indicated by a circle is turned off. At the next time point, the image L-1 for the left eye is displayed on the transmissive image display panel 1, the light source LL1 for the left eye EYE1 indicated by a circle among the linear light sources 45 is turned on, and the right eye EYE2 indicated by a circle is indicated. Light source LL2 is turned off.

  As described above, the image for the left eye and the image for the right eye displayed on the transmissive image display panel 1 and the light source for the left eye and the light source for the right eye of the linear light source 45 are time-divided. By switching, the directional images are separately projected on both the left and right eyes, and can be observed as a stereoscopic image. FIG. 32 illustrates a conventional example in which the number of directions irradiated by the linear light source is two. However, when the number of directions is three or more, the linear light source 44 corresponds to each pixel of the transmissive image display panel 1. Are arranged as LL1, LL2, LL3,..., So that when a directional image at a certain point in time is displayed on the transmissive video display panel 1, only the corresponding one type of linear light source is turned on. In this way, even three or more directional images are separately projected, so that when the observation position is moved, the wraparound of the stereoscopic image can be expressed.

JP-A-6-205446

  The conventional stereoscopic video display device described with reference to FIG. 32 has a problem that the linear light source for irradiating the transmission type video display panel needs to have a finer structure than the pixels of the LCD used for the transmission type video display panel. there were.

  In addition, in the irradiation by the linear light source, the number of directional images to be projected can be increased only to the left and right, so that there is a problem that a change in a three-dimensional image when an observer moves up and down or back and forth cannot be expressed.

  In addition, when the number of directional images to be projected is two, there is only one observation position, and there is a problem that a stereoscopic image cannot be displayed when the observer moves the position.

  In addition, when the number of directional images forming a stereoscopic video is increased, there is a problem that it is necessary to increase the time-division switching frequency until flicker cannot be recognized.

  In addition, since the directional image is projected on only one eye of the observer while moving to the observation position where the stereoscopic image can be observed, there is a problem that the images of the left and right eyes are completely different and unpleasant.

  Further, the projection of three or more directional images has a problem in that even if a plurality of observers can observe a stereoscopic image, the stereoscopic image differs for each observer.

  In addition, even when a normal two-dimensional image display is performed by repeating the same image and simultaneously irradiating a linear light source without making the image displayed on the transmission type image display panel a different direction image for each field, the observation position is the same as the stereoscopic display. There was a problem that there was only one place.

  Further, since the shape of the linear light source is determined by the transmission type image display panel and the observation position, there is a problem in that there is no design freedom.

  Further, when an image obtained by image input time-divided for each field as shown in FIG. 33 (a) is displayed on a CRT as shown in FIG. 33 (b), it only shines at a scanning point at the moment when the display surface is scanned. Therefore, at any moment, the image R-1 and the image L-1 are temporally separated. However, when the image is displayed on the LCD as a transmissive image display panel as shown in FIG. Next, since the display is continued until this pixel is scanned, there is a problem in that the display of the image R-1 and the image L-1 is continued in all the shaded areas, so that they are not temporally separated.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a light source having a simple configuration, and a transmission type image display panel to display a time-divisionally displayed directional image on both the left and right sides of an observer. An object of the present invention is to obtain a stereoscopic video display device that displays a stereoscopic video by projecting the stereoscopic video onto an eye.

  Further, a three-dimensional image display device is provided which projects three or more directional images in a left-right direction, which is displayed by a transmission-type image display panel in a time-division manner, with a light source having a simple configuration.

Further, the present invention provides a stereoscopic video display device which projects a plurality of directional images in a horizontal direction and a vertical direction, which are displayed by a transmission type video display plate in a time-division manner, with a light source having a simple configuration.
It is another object of the present invention to provide a three-dimensional image display device which can always display a three-dimensional image following an observation position even if the position of the observer moves in the left-right direction.

It is another object of the present invention to provide a stereoscopic video display device which can always display a stereoscopic video following an observation position even if the position of the observer moves in the left and right and up and down directions.
It is another object of the present invention to provide a three-dimensional image display device that can always display a three-dimensional image following an observation position even if the position of the observer moves in the left-right and front-back directions.

  It is another object of the present invention to provide a three-dimensional image display device which can always display a three-dimensional image following an observation position even if the position of the observer moves in the left-right, up-down, and front-rear directions.

  Also, in a stereoscopic video display device that projects three or more directional images in the left-right direction, only two directional images for the left and right eyes required for stereoscopic vision at the observation position are projected to the observer among the three or more directional images. To obtain a three-dimensional image display device.

  Further, in a stereoscopic video display device that projects a plurality of directional images in the left-right and up-down directions, a three-dimensional video display that projects only two directional images of the left and right eyes required for stereoscopic viewing at an observation position among the plurality of directional images. Get the device.

  Further, in a stereoscopic image display device that projects a plurality of directional images in the left, right, up, down, and front and rear directions, a stereoscopic image that projects only two directional images of the left and right eyes required for stereoscopic vision at an observation position among the plurality of directional images. An image display device is obtained.

  Another object of the present invention is to provide a three-dimensional image display device that does not enter a state in which a directional image is projected to only one eye while the observer is moving to an observation position at which a three-dimensional image can be observed.

  Another object of the present invention is to provide a stereoscopic video display device that projects a plurality of directional images and that can display the same stereoscopic video to a plurality of observers.

  Another object of the present invention is to provide a three-dimensional image display device that can observe a wide range when switching to normal two-dimensional image display.

  Further, a light source used for a stereoscopic image display device is obtained.

  It is another object of the present invention to provide a three-dimensional image display device capable of arbitrarily setting the shape of a light source.

  Another object of the present invention is to provide a stereoscopic video display device capable of reducing flicker.

  Further, even if an LCD is used for a transmission type video display panel that displays a time-divided directional image, a stereoscopic video display device capable of displaying a time-divided directional image in a temporally separated manner is provided.

  The display device of the present invention includes an LCD, and performs a full-screen black display on the LCD each time a video signal for one field or one frame is input to the LCD when sequentially displaying different images on the LCD. Input a full-screen black signal.

  ADVANTAGE OF THE INVENTION According to the display apparatus of this invention, the front and back images are not simultaneously displayed at any arbitrary time even in a part, and the front and rear images can be displayed temporally separated.

Embodiment 1 FIG.
FIG. 1 is a principle view of a stereoscopic image display device according to a first embodiment of the present invention as viewed from above. In the figure, reference numeral 1 denotes a transmissive image display panel, 2 denotes a convex lens plate larger than the display surface of the transmissive image display plate 1 disposed on the back of the transmissive image display plate 1, o denotes the center of the convex lens plate, and FL denotes the focal point. . Reference numeral 3 denotes a boundary between the transmissive image display panel 1 and the two direction images displayed in a time-division manner on the transmissive image display panel 1 for selectively irradiating the left and right eyes of the observer to display a stereoscopic image. A divided light source that emits light at an arbitrary partial area on a light emitting surface arranged on a space opposite to a space where an observer is located, 4 is a left and right image that outputs signals of two directional images displayed on a transmission type image display panel 1 Signal sources 4R and 4L are right-eye video and left-eye video signal sources for outputting video R and L, respectively. Reference numeral 5 denotes a time-division circuit for alternately switching the direction images for the left and right eyes displayed on the transmission type video display panel 1 alternately with time. Is a division control circuit that controls the divided light source 3 to alternately emit light in the left and right divided regions 3R and 3L. FIG. 2 is an optical path diagram for explaining the operation of the first embodiment, and shows an optical path of a backlight that illuminates each position on the transmissive image display panel 1 at the observation position.

  Next, the operation will be described with reference to FIGS. As shown in FIG. 1, when the area 3L of the divided light source 3 emits light, light emitted from the point 3a on the area 3L in the direction between the convex lens plate 2a and 2b forms an image at the point a by the convex lens plate 2. Is done. Similarly, light emitted from each point from point 3a to point 3b in the direction between 2a and 2b of convex lens plate 2 forms an image at a position on line L from point a to b. Light emitted from points 3a to 2b and 3b to 2a is imaged by convex lens plate 2 at point c, and light emitted from points 3a to 2a and 3b to 2b is imaged by convex lens plate 2 to point d. Conversely, when the convex lens plate 2 is viewed from the point a, the point 3a is enlarged over the entire surface of the convex lens plate 2, and the entire surface of the convex lens plate 2 appears to emit light. Similarly, when the convex lens plate 2 is viewed from the position on the line L from the point a to the point b, the entire surface of the convex lens plate 2 appears to emit light with light emitted from each point from the point 3a to the point 3b. When the convex lens plate 2 is viewed from the points c and d, the area 3L is enlarged to the entire surface of the convex lens plate 2, and the entire surface of the convex lens plate 2 appears to emit light. That is, when the region 3L of the divided light source 3 emits light, the observation position where the entire surface of the convex lens plate 2 is seen to emit light is within a hatched area including a line L surrounded by solid lines of points a, b, c, and d. Outside this range, the light emitted from the area 3L of the divided light source 3 cannot be seen, and the convex lens plate 2 is dark. Similarly, when the region 3 </ b> R of the divided light source 3 emits light, the observation position where the entire surface of the convex lens plate 2 appears to be illuminated is within an oblique line range including a line R surrounded by a dotted line. Since the transmissive image display panel 1 does not emit light by itself and controls transmitted light to display an image, an image cannot be seen without a backlight. For this reason, the state in which the entire surface of the convex lens plate 2 emits light corresponds to the state with the backlight. Therefore, when the area 3L emits light, only when viewed from the shaded area including the line L, and when the area 3R emits light. In this case, the image on the transmissive image display panel 1 can be observed only when viewed from inside the hatched area including the line R. Therefore, the images R and L are switched at high speed by the time-division circuit 5 and displayed on the transmissive image display panel 1, and the division control circuit 6 switches the right and left light-emitting regions 3R and 3L of the divided light source 3 at high speed. By viewing the transmissive image display panel 1 with the left eye from any position in the hatched area including the line L and the right eye from any position in the hatched area including the line R, the images R and L can be displayed. The left and right eyes can be viewed separately as images having different parallax angles.

  FIG. 2 shows the luminance depending on the position in the hatched area where the image on the transmission type image display panel 1 can be observed. 2A shows an optical path of a backlight illuminating each position on the transmissive image display panel 1 as viewed from a point a and FIG. 2B as viewed from a point c. In (b), since the light in the entire area 3L passes through the transmissive video display panel 1, only the light at the point 3a seems to be brighter than in the case of (a) passing through the transmissive video display panel 1. However, of the light emitted from the point 3a in (b), only the light passing through the point 2b can be seen at the point c, and the other light is irrelevant. That is, in (a) and (b), the luminance of light passing through the point 2b is the same. Similarly, the light emitted from the points 3b, 3c, 3d, and 3e is only a light passing through the points 2a, 2c, 2d, and o among the light emitted from each point in all directions. The display panel 1 has the same brightness both when viewed from the point a and when viewed from the point b. As a result, irrespective of the position in the shaded area where the image of the transmission type image display panel 1 can be observed, the image can be observed as a directional image having the same luminance, so that stereoscopic display can be observed in a wide range.

Embodiment 2. FIG.
In the above-described first embodiment, the divided light source 3 is divided into left and right to emit light. However, in the second embodiment, the divided light source 3 is divided into three or more in the left and right direction to emit light. FIG. 9 is a principle diagram of the stereoscopic image display device according to the second embodiment viewed from above. In the figure, reference numeral 7 denotes a plurality of video signal sources for outputting signals of three or more directional images to be displayed on the transmission type video display panel 1, and 7A, 7B, 7C and 7D in FIG. , D are output. Reference numeral 8 denotes a plurality of time-division circuits for sequentially switching three or more directional images displayed on the transmission type video display panel 1, and 9 corresponds to sequential switching of three or more directional images for displaying the divided light source 3 on the transmission type video display panel 1. Is a multi-segment control circuit that controls so as to sequentially emit light in three or more divided regions 3A, 3B, 3C and 3D.

  Next, the operation will be described. As shown in FIG. 3, when the region 3A of the four divided light sources 3 of the divided light source 3 emits light by the multiple division control circuit 9, the observation positions at which the entire surface of the convex lens plate 2 emits light are points a, e, and f. , G within a diagonal range including a line A surrounded by solid lines, and outside this range, light emitted from the region 3A of the divided light source 3 is not visible, and the convex lens plate 2 is dark. Similarly, when the regions 3B, 3C, and 3D of the divided light source 3 emit light, the observation positions where the entire surface of the convex lens plate 2 is seen to emit light are indicated by oblique lines including lines B, C, and D surrounded by dotted lines, respectively. Within range. Since the transmissive image display panel 1 does not emit light by itself and controls transmitted light to display an image, the images A, B, and C correspond to high-speed switching of the light emitting areas 3A, 3B, 3C, and 3D of the divided light source 3. , And D are switched by the plurality of time-sharing circuits 8 and displayed on the transmission type video display panel 1, so that images in the respective directions in the directions of the lines A, B, C, and D can be projected. As a result, the left and right eyes can see different stereoscopic images at three observation positions at positions A and B, or B and C, or C and D. For example, when the stereoscopic display object is moved in the left and right direction and viewed. The wraparound of the case can also be displayed.

Embodiment 3 FIG.
In the second embodiment, the divided light source 3 is divided into three or more in the left-right direction to emit light. In the third embodiment, the divided light source 3 is further divided into the left and right and up and down to emit light. FIG. 4 is a principle view of the stereoscopic video display device according to the third embodiment of the present invention as viewed obliquely. In the figure, a plurality of video signal sources 7 are left and right and up and down directional image signal sources to be displayed on the transmission type video display panel 1, and in FIG. Output DD. The multiple video signal sources 7 are switched by the multiple time division circuit 8 and displayed on the transmission type video display panel 1. Reference numeral 10 denotes a plane division control circuit for controlling the divided light sources 3 to sequentially emit light in left and right and up and down divided regions 3AA to 3DD in accordance with the sequential switching of left and right and up and down direction images displayed on the transmission type video display panel 1. It is.

  Next, the operation will be described. As shown in FIG. 4, when the area 3DB of the 16 divided light sources 3 by the plane division control circuit 10 emits light, the observation position at which the entire surface of the convex lens plate 2 appears to emit light is an octahedron including the surface DB. Within this range, light emitted from the region 3DB of the divided light source 3 cannot be seen outside this range. The images AA to DD are switched by the plurality of time division circuits 8 and displayed on the transmissive image display panel 1 in synchronization with the high-speed switching of the light emitting areas 3AA to 3DD of the divided light source 3, so that the images are displayed in the left, right, up and down 16 directions. Can be projected. As a result, the left and right eyes can see different stereoscopic images at the viewpoint positions in the left and right direction and the up and down direction. For example, it is possible to display a wraparound when the three-dimensional display object is moved in the left and right and up and down directions.

Embodiment 4. FIG.
FIG. 5 is a principle view of a stereoscopic image display device according to a fourth embodiment of the present invention as viewed from above. In the figure, reference numeral 11 denotes a left / right position detector for detecting the left / right position of an observer, and 12 denotes a division position moving circuit for controlling the division position of the division light source 3 so as to emit light in the left and right divided regions.

  Next, the operation will be described. As shown in FIG. 5, when the divided position moving circuit 12 emits light alternately in the regions 3E and 3F divided into right and left at a point 3f on the divided light source 3, when the region 3E emits light, the entire surface of the convex lens plate 2 emits light. The observing position seen within the range is within the oblique range including the line E surrounded by the solid lines of the points a, h, i, and j. Similarly, when the region 3F emits light, the entire surface of the convex lens plate 2 emits light. Observation positions that can be seen are within a hatched area including a line F surrounded by a dotted line. That is, when the point 3f on the divided light source 3 is moved right and left, the viewpoint position by projection of the directional images of the images R and L moves left and right according to the movement of the point h at the point o symmetric position. Therefore, when the observer moves right and left, the left and right position detector 11 for detecting the position of the observer controls the division position moving circuit 12 so that the viewpoint position by projecting the directional images of the images R and L follows the observer. By doing so, a stereoscopic image can always be observed even when the observer moves.

Embodiment 5 FIG.
FIG. 6 is a principle view of the stereoscopic image display device according to the fifteenth embodiment of the present invention as viewed from above. In other words, the divided position moving circuit 12 according to the fourth embodiment is required to be the minimum necessary in the horizontal direction according to the position of the observer. The light emitting position left and right moving circuit 13 for emitting the divided light sources in the area of FIG. As shown in FIG. 6, the light-emitting position left-right moving circuit 13 is controlled by a left-right position detector 11 for detecting the position of the observer, and if the observer's EYE1 and EYE2 are located at points a and k, the divided light source If the light is emitted only on the points 3a and 3e on the light source 3 and the EYE1 and EYE2 move to the positions of the points e and l, the light emitting points on the divided light source 3 move to the positions of the points 3c and 3g. That is, as in the case of the fourth embodiment, a stereoscopic image can be always observed even when the observer moves left and right, and power consumption can be reduced by minimizing the light emitting area on the divided light source 3. .

Embodiment 6 FIG.
In the fourth and fifth embodiments, the light-emitting area of the divided light source 3 is moved in the left-right direction. In the sixth embodiment, the light-emitting area of the divided light source 3 is further moved in the left-right and up-down directions. It is a principle view which looked at a three-dimensional image display device in Example 6 of the invention from a slant. In the figure, 14 is a plane position detector for detecting the position of the observer in the left and right and up and down directions, and 15 is a light emitting position plane moving circuit for causing the divided light source 3 to emit light in minimum necessary regions in the left and right and up and down directions.

  Next, the operation will be described. As shown in FIG. 7, the light emission position plane moving circuit 15 is controlled by the plane position detector 14 for detecting the plane position of the observer, and if the observer's EYE1 and EYE2 are located at the points aa and ba, the division is performed. By emitting light only on the points 3aa and 3ba on the light source 3, a three-dimensional image can be observed, and the light emitting area on the divided light source 3 is also emitted in only a minimum range in the vertical direction to further reduce power consumption. be able to.

Embodiment 7 FIG.
FIG. 8 is a principle view of a stereoscopic image display device according to a seventh embodiment of the present invention as viewed from above. In the figure, 16 is a distance detector for detecting the distance to the observer, and 17 is a light emitting area left / right variable circuit that changes the light emitting area range in the left and right direction of the divided light source 3 according to the distance to the observer.

  Next, the operation will be described. As shown in FIG. 8, when the left and right eyes of the observer are at the positions of points n and p, the left / right position detector 11 causes the left / right movement circuit 13 to determine the left / right direction light emission position and the distance detector 16 emits light. The area left / right variable circuit 17 controls the light emitting area range to cause the areas 3G and 3H of the divided light source 3 to emit light alternately. Since the areas 3G and 3H emit light with overlapping ranges, the two oblique line ranges of the observation position where the entire surface of the convex lens plate 2 can be seen to emit light also overlap. However, the range in which the points n and p can be followed is described with reference to FIGS. It can be extended forward and backward from the range of Examples 4 and 5.

Embodiment 8 FIG.
In the seventh embodiment, the viewpoint position follows the observer in the left-right and front-rear directions. In the eighth embodiment, the observer also follows the up-down direction. FIG. 9 shows a stereoscopic image display in the eighth embodiment of the present invention. It is the principle figure seen from the slant of the device. In the figure, reference numeral 18 denotes a light emitting area plane variable circuit that changes the light emitting area range in the left, right, up and down directions of the divided light source 3 according to the distance to the observer.

  Next, the operation will be described. As shown in FIG. 9, when the left and right eyes of the observer are at the positions of points ga and gb, the plane position detector 14 causes the light emitting position plane moving circuit 15 to determine the light emitting position in the left, right, up and down directions by the distance detector 16. The light-emitting area plane variable circuit 18 controls the light-emitting area ranges in the left-right and up-down directions, thereby causing the areas 3GA and 3HA on the divided light source 3 to emit light alternately. Since the areas 3GA and 3HA emit light with overlapping ranges, the range of observation positions where the entire surface of the convex lens plate 2 can be seen to emit light also overlaps. 8, light emission can be performed only in a necessary range in the up-down direction in accordance with the seventh embodiment described with reference to FIG. 8, and the front-back position can be followed. Therefore, power consumption can be reduced.

Embodiment 9 FIG.
FIG. 10 is a principle diagram of a stereoscopic image display device according to Embodiment 9 of the present invention as viewed from above. In the figure, reference numeral 19 denotes a signal left / right switching circuit for selecting the outputs of a plurality of time division means 5 provided in such a manner as to alternately switch between three or more directional images in time, in accordance with the left / right position of the observer. Is a division position switching circuit that moves the division position of the division light source 3 to any one of a plurality of fixed positions and causes the division light source 3 to emit light alternately in two division regions.

  Next, the operation will be described. A plurality of fixed division positions are set for the division light source 3 by the division position switching circuit 20. In the example of FIG. 10, the division light source 3 is divided into four parts at points 3c, 3b, and 3g. Control is performed so that light is emitted alternately in the region 3D and in the other region at the point 3g except for the region 3R and the region 3D. In addition, the signals of the plurality of video signal sources 7 correspond to the alternating light emission by the division position switching circuit 20 by the three time division circuits 5 by the combination of the video signals A and B, the video signals B and C, and the video signals C and D. It has been switched. Here, when the left and right eyes of the observer are at the positions of A and B, the left and right position detector 11 detects and controls the division position switching circuit 20, and the divided light source 3 is divided into the region 3A and the other region with the point 3c as a boundary. And the output of the time division circuit 5 for switching between the video signals A and B is selected by the signal left / right switching circuit so as to be displayed on the transmission type video display panel 1. Similarly, the left and right eyes of the observer select the positions B and C and the positions C and D by the signal left / right switching circuit. As a result, even when three or more directional images are displayed in the left-right direction, instead of sequentially switching and displaying the three or more directional images as in the second embodiment, display is performed by alternately switching the time for each adjacent directional image. Can be selected and displayed according to the position of the observer, so that it is not necessary to increase the switching frequency in order to reduce flicker.

Embodiment 10 FIG.
FIG. 11 is a principle view of the stereoscopic image display apparatus according to the tenth embodiment of the present invention as viewed from above. In other words, the division position switching circuit 20 of the ninth embodiment is provided with a light-emitting area divided into a plurality of divided light sources 3. A light emitting area switching circuit 21 that alternately emits light from two adjacent areas according to the left and right positions of the observer is shown. The divided light source 3 has a plurality of light-emitting regions set by the light-emitting region switching circuit 21, and is divided into four regions 3A, 3B, 3C, and 3D in the example of FIG. At some time, the left / right position detector 11 detects the light and controls the light emitting area switching circuit 21 to alternately emit the divided light sources 3 in the areas 3A and 3B, and at the same time, the output of the time sharing circuit 5 for switching the video signals A and B. Selection is made by the signal left / right switching circuit so as to be displayed on the transmission type video display panel 1. Similarly, the left and right eyes of the observer select the positions B and C and the positions C and D by the signal left / right switching circuit. As a result, the same display as in the ninth embodiment can be performed even when the light emitting area of the divided light source 3 is reduced, so that power consumption can be reduced.

Embodiment 11 FIG.
FIG. 12 is a principle view of the stereoscopic image display device according to the eleventh embodiment of the present invention as viewed obliquely. In other words, two directional images are alternately displayed on the left and right according to the position of the observer from among a plurality of directional images. In the ninth embodiment, two directional images are alternately displayed according to the position of the observer from among a plurality of directional images in the horizontal and vertical directions. In the figure, reference numeral 22 denotes a signal up / down switching circuit for selecting the outputs of a plurality of signal left / right switching circuits 19 for each vertical position by the plane position detector 14. In the example of FIG. 12, the plurality of video signal sources 7 output video signals AA to DD in a total of 16 directions, that is, four directions in the left, right, up, and down directions. When the left and right eyes of the observer are at the positions of CB and DB, The detector 14 detects and controls the division position moving circuit 20 to alternately emit the divided light sources 3 in regions other than the regions 3D and 3D, and at the same time, signals the left and right positions of the output of the time division circuit 5 for switching between the video signals CB and DB. The signal is selected by the left and right switching circuit 19, and the upper and lower positions are selected by the signal upper and lower switching circuit 22 and displayed on the transmission type video display panel 1. As a result, instead of displaying the images in the left, right, up, and down directions sequentially and displaying them as in the third embodiment, it is possible to select and display the images alternately switched for each adjacent direction image in accordance with the position of the observer. Therefore, it is not necessary to increase the switching frequency.

Embodiment 12 FIG.
FIG. 13 is a principle view of a stereoscopic image display apparatus according to Embodiment 12 of the present invention as viewed from above. In other words, two directional images are alternately displayed on the left and right according to the position of the observer among a plurality of directional images. In the ninth embodiment, two directional images are alternately displayed according to the position of the observer from among a plurality of directional images in the left, right, front and rear directions. In the figure, reference numeral 23 denotes a signal distance switching circuit for selecting the outputs of a plurality of signal left / right switching circuits 19 for each of the front and rear positions by the distance detector 16. In the example of FIG. 13, the plurality of video signal sources 7 output video signals AA to DD at four positions in the left, right, front and rear, respectively, for a total of 16 positions. When the left and right eyes of the observer are at the positions of BD and AD, the left and right positions The detector 11 and the distance detector 16 detect and control the light emitting position left / right moving circuit 13 and the light emitting area left / right variable circuit 17 so that the divided light sources 3 alternately emit light in the areas 3G and 3H, and simultaneously generate the video signals BD and AD. The left / right position of the output of the time division circuit 5 to be switched is selected by the signal left / right switching circuit 19, and the front / rear position is selected by the signal distance switching circuit 23 and displayed on the transmission type video display panel 1. As a result, the left, right, front and rear direction images can be selected and displayed according to the position of the observer.

  In addition, as shown in FIG. 14, by providing both the signal up / down switching circuit 22 and the signal distance switching circuit 23, left-right, up-down, and front-back direction images can be selected and displayed according to the position of the observer. .

Embodiment 13 FIG.
FIG. 15 is a principle diagram of a stereoscopic image display apparatus according to Embodiment 13 of the present invention as viewed from above. In the figure, reference numeral 24 denotes a display stop circuit for stopping light emission of the divided light sources 3 in accordance with the left and right positions of the observer detected by the left and right position detector 11.

  Next, the operation will be described. When the left and right eyes EYE1 and EYE2 are at the positions q and r, the divided light source 3 cannot display the directional image at the position q. At this time, the left and right position detector 11 detects that the left and right eyes EYE1 and EYE2 are at the positions q and r, and controls the display stop circuit 24 to emit light of the point 3d on the divided light source 3 projected to the right eye EYE2. By stopping, both eyes EYE1 and EYE2 cannot see. When the left and right position detector 11 detects that the observer comes to a position where the split light source 3 can display both the left and right eyes EYE1 and EYE2, the display stop circuit 24 is controlled to emit light from the split light source 3. Thus, it is possible to make it visible with both the left and right eyes EYE1 and EYE2. As a result, the image is displayed on only one side before reaching the position where stereoscopic viewing is possible, and the left and right eyes do not become completely different.

Embodiment 14 FIG.
FIG. 16 is a principle view of a stereoscopic image display apparatus according to Embodiment 14 of the present invention as viewed from above. In the figure, reference numeral 25 denotes a stereoscopic display mode change that enables switching between a display in which three or more directional images are alternately switched in an adjacent direction and a display in which two left and right binocular directional images follow an observer. Circuit. In the example of FIG. 16, the plurality of video signal sources 7 output video signals A to D of four directional images on the left and right, and the output of the signal left and right switching circuit 19 for selecting a display for alternately switching the adjacent directional images with time. The output of the time division circuit 5 that causes the images B and C to follow each observer can be selected by the stereoscopic display mode change circuit 25. As a result, it is possible to select a stereoscopic display that wraps around according to the viewpoint position and a simultaneous stereoscopic display that is performed by a plurality of observers.

Embodiment 15 FIG.
FIG. 17 is a principle diagram of a stereoscopic image display device according to Embodiment 15 of the present invention as viewed from above. In the figure, reference numeral 26 denotes a full-surface light emitting circuit for causing the divided light source 3 to emit light over the entire surface, and 27, a flat display changing circuit for switching between three-dimensional (three-dimensional) display and two-dimensional display. In the example of FIG. 17, three-dimensional (three-dimensional) display of the images R and L by alternately switching the time and division control of the divided light source 3 is performed, and display of a single-eye image and two-dimensional display by the entire light emitting circuit 26 of the divided light source 3 are performed. Can be selected by the plane display change circuit 27. As a result, a normal non-stereoscopic image can be observed in a wide range.

Embodiment 16 FIG.
FIG. 18 is a perspective view showing the configuration of the split light source 3 according to Embodiment 16 of the present invention. In the figure, reference numerals 28, 29, 30, and 31 denote independent partial surface light sources that emit surface light. Although the example of FIG. 18 shows a configuration in which the image is divided into four parts in the left and right directions, it is needless to say that the number of divisions and the division in the vertical direction can be realized by increasing the number of partial surface light sources.

Embodiment 17 FIG.
FIG. 19 is a perspective view showing the configuration of the split light source 3 in Embodiment 17 of the present invention. In the figure, reference numeral 32 denotes a surface light source that always emits surface light, and reference numerals 33, 34, 35, and 36 denote independent light shutters for controlling light blocking and passing. Although the example of FIG. 19 shows a configuration in which the image is divided into four parts in the left and right directions, it is needless to say that the number of divisions and the division in the vertical direction can be realized by increasing the number of optical shutters.

Embodiment 18 FIG.
FIG. 20 is a perspective view showing the configuration of the split light source 3 according to Embodiment 18 of the present invention. In the figure, reference numeral 37 denotes a CRT light source. In the CRT light source 37, since the light emitting area of the light source can be set arbitrarily, light emission in which the light emitting areas overlap can be performed.

Embodiment 19 FIG.
FIG. 21 is a perspective view showing the configuration of the split light source 3 in Embodiment 19 of the present invention. In the figure, reference numeral 38 denotes a shutter-type transmissive image display panel. Since the light-emitting area of the light source can be set arbitrarily in the same manner as in the eighteenth embodiment, light can be emitted so that the light-emitting areas overlap.

Embodiment 20 FIG.
FIG. 22 is a perspective view showing the configuration of the convex lens plate 2 according to Embodiment 20 of the present invention. In the figure, reference numeral 39 denotes a toric lens plate having a different curvature in a cross section orthogonal to the cross section. By using the toric lens plate 39, the size of the divided light source 3 and the observation position can be arbitrarily set with respect to the transmission type image display panel 1.

Embodiment 21 FIG.
FIG. 23 is a principle diagram of the stereoscopic video display device according to Embodiment 21 of the present invention as viewed from above. In the figure, reference numeral 40 denotes a high-speed scanning control circuit for speeding up the display of the transmissive image display panel 1 and the emission control of the divided light sources 3. In the example shown in FIG. 23, four-direction images are sequentially projected, so that the high-speed scanning control circuit 40 can speed up the projection, thereby reducing flicker. Further, it goes without saying that the present invention can be applied to the case where the display of the transmission type video display panel 1 is alternately switched for the left and right eyes, or in the case of four or more images.

Embodiment 22 FIG.
FIG. 24 is a principle diagram of the stereoscopic video display device according to Embodiment 22 of the present invention as viewed from above. In other words, an input signal when the transmission type video display panel 1 is formed of an LCD is provided for each field of the video signal. The figure shows an example in which the entire screen is displayed in black. In the figure, 41 is a full screen black display switching circuit, and 42 is a full screen black display signal source. FIG. 25 is a diagram showing the time change of the display area for explaining the operation of this embodiment 22 of the present invention. FIG. 25 (a) shows the video R, L and the video R, L displayed on a full screen in black for every single field. The video input switched in frame units, and (b) shows the time change of the area displayed on the screen by the video input of (a).

  Next, the operation will be described with reference to FIGS. As shown in FIG. 24, the images R and L are switched from one field to the full screen black display signal source 42 by the full screen black display switching circuit 41, and are input to the frame switching transmission type video display panel 1 by the time division circuit 5. You. Here, as shown in FIG. 25 (a), the video R and L have the fields 1 and 2 reversed in advance, and the video input is to display only the field 1 in both the video R and L. At this time, as shown in (b), when the image R-1 is input in the first field, the area displayed on the screen is displayed from the first line to the 262.5th line, and then in the second field. The video R-1 is erased from the first line to the 262.5th line after the full screen black signal is input. Field 1 of the video L-1 is input in the next third field and displayed from the first line to the 262.5th line, and a full screen black signal is input in the next fourth field and the first screen is set to 262. The image L-1 is deleted up to the fifth line, and this is repeated thereafter. As a result, even if an LCD that continues to display until the next signal comes to the same pixel of the transmission type video display panel 1, both screens are not simultaneously displayed at any time in any part, and the video R, R The entire screen of L can be separated in time.

Embodiment 23 FIG.
FIG. 26 is a diagram showing the time change of the display area for explaining the operation of the embodiment 23 of the present invention. More specifically, the pixel for displaying the field 2 of the LCD of the transmissive video display panel 1 is the same as the field 1. The time change of the display area when displaying an image simultaneously is shown. In Example 22, even if the entire screen of the left and right images R and L can be time-separated, horizontal stripes are formed because only half of the pixels of the LCD are used. Display without horizontal stripes.

Embodiment 24 FIG.
FIG. 27 is a diagram showing a time change of the display area for explaining the operation of the twenty-fourth embodiment of the present invention. In the case where the transmission type video display panel 1 is constituted by an LCD, the input signal is completely changed every frame display of the video signal. The screen is displayed in black. In the figure, (a) shows video R, L, and video input in which video R and L are displayed in black for every frame and then switched every two frames, and (b) shows video input of (a). It shows the time change of the area displayed on the screen. At this time, as shown in FIG. 27 (b), the area displayed on the screen displays the first to 262.5th lines in the video R-1, and the 262.5th to 525th lines in the video R-2. Display up to the line. Next, one frame of the full-screen black signal is input, and the image R-1 is deleted from the first line to the 525th line. Next, the image L-1 is displayed from the first line to the 262.5th line, and the image L-2 is displayed from the 262.5th line to the 525th line. Next, one frame of the full-screen black signal is input, and the image R-1 is erased from the first line to the 525th line. As a result, even if an LCD that continues to display the same pixel on the transmissive video display panel 1 until the next signal is used, both screens are not simultaneously displayed at any arbitrary time, and the video R, The entire screen of L can be time-separated, and the vertical resolution does not decrease as in the above-described embodiments 22 and 23.

Embodiment 25 FIG.
FIG. 28 is a diagram showing the time change of the display area for explaining the operation of the twenty-fifth embodiment of the present invention. In the twenty-fourth embodiment, the frequency at the time of scanning the screen at the time of inputting the full-screen black display signal is increased. I have. In the figure, (a) shows an image input in which the video R and L and the image R and L are switched every two frames after displaying the entire screen black for each frame, and the frequency at the time of black display scanning is increased. (b) shows the time change of the area displayed on the screen by the video input of (a). At this time, in the area displayed on the screen, as shown in FIG. 28B, the entire screen of the video images R and L can be time-separated, and the display frequency can be further increased.

Embodiment 26 FIG.
FIG. 29 is a principle diagram of the stereoscopic image display device according to Embodiment 26 of the present invention as viewed from above. Specifically, the image R, L, and the frequency at the time of screen scanning when displaying a full screen black signal are increased. Further, there is shown a case where there is no input signal between the images R and L and the full screen black signal. In the figure, reference numeral 43 denotes a scanning stop circuit. FIG. 30 is a diagram showing a temporal change of the display area for explaining the operation of the twenty-sixth embodiment of the present invention. FIG. 30 (a) repeats video R, L, video R, L display, scanning stop, and full-screen black display. (B) shows a time change of the area displayed on the screen by the video input of (a). At this time, in the area displayed on the screen, as shown in FIG. 28B, the entire screen of the images R and L can be time-separated, and the image display period is made longer than the non-display period by black display. Thus, the average light transmittance of the screen can be increased, and the luminance can be improved.

Embodiment 27 FIG.
FIG. 31 is a view showing the principle of the stereoscopic image display apparatus according to the twenty-seventh embodiment of the present invention as viewed from above. FIG. 2 shows a configuration in which the split light source 3 emits light in synchronization with the image display on the display panel 1. In the figure, reference numeral 44 denotes a light emission stop circuit. As a result, even when the transmission type image display panel for shutter 38 is used as the divided light source 3, the light emission of the divided area can be time-separated.

FIG. 2 is a principle diagram of the stereoscopic video display device according to the first embodiment of the present invention as viewed from above. FIG. 4 is an optical path diagram for explaining the operation of the first embodiment. FIG. 9 is a principle diagram of a stereoscopic image display device according to a second embodiment of the present invention as viewed from above. FIG. 11 is a principle view of a three-dimensional image display device according to a third embodiment of the present invention when viewed obliquely. FIG. 13 is a principle diagram of a stereoscopic image display device according to a fourth embodiment of the present invention as viewed from above. FIG. 14 is a principle diagram of a stereoscopic image display device according to a fifth embodiment of the present invention as viewed from above. FIG. 13 is a principle view of a stereoscopic image display device according to a sixth embodiment of the present invention when viewed obliquely. FIG. 14 is a principle diagram of a stereoscopic image display device according to a seventh embodiment of the present invention as viewed from above. It is a principle view which looked at a three-dimensional image display device in Example 8 of the present invention from a slant. FIG. 19 is a principle diagram of a stereoscopic image display device according to a ninth embodiment of the present invention as viewed from above. It is a principle view which looked at a three-dimensional image display device in Example 10 of the present invention from the upper part. It is a principle view which looked at the three-dimensional image display apparatus in Example 11 of this invention from diagonal. It is a principle view which looked at a three-dimensional image display device in Example 12 of the present invention from the upper part. It is a principle view which looked at a three-dimensional image display device in Example 12 of the present invention from a slant. It is a principle view which looked at a three-dimensional image display device in Example 13 of the present invention from the upper part. FIG. 15 is a principle diagram of a stereoscopic image display device according to Embodiment 14 of the present invention as viewed from above. FIG. 16 is a principle diagram of a stereoscopic image display device according to Embodiment 15 of the present invention as viewed from above. It is a perspective view showing the composition of the division light source in Example 16 of the present invention. FIG. 21 is a perspective view illustrating a configuration of a split light source according to a seventeenth embodiment of the present invention. It is a perspective view showing the composition of the division light source in Example 18 of the present invention. It is a perspective view showing the composition of the division light source in Example 19 of the present invention. It is a perspective view which shows the structure of the convex lens plate in Example 20 of this invention. FIG. 21 is a principle diagram of a stereoscopic image display device according to Embodiment 21 of the present invention as viewed from above. FIG. 23 is a principle diagram of a stereoscopic image display device according to Embodiment 22 of the present invention as viewed from above. FIG. 21 is a diagram illustrating a temporal change of a display area for explaining an operation of Example 22 of the present invention. FIG. 24 is a diagram illustrating a temporal change of a display area for explaining an operation of Example 23 of the present invention. FIG. 25 is a diagram illustrating a temporal change of a display area for explaining an operation of Example 24 of the present invention. FIG. 25 is a diagram illustrating a time change of a display area for explaining an operation of the example 25 of the present invention. FIG. 34 is a principle diagram of a stereoscopic image display device according to Embodiment 26 of the present invention as viewed from above. FIG. 32 is a diagram illustrating a temporal change of a display area for explaining an operation of the example 26 of the present invention. FIG. 28 is a principle diagram of a stereoscopic image display device according to Embodiment 27 of the present invention as viewed from above. It is the principle figure which looked at the conventional three-dimensional image display apparatus from the upper part. FIG. 9 is a diagram showing a temporal change of an image display area of a conventional stereoscopic image display device.

Explanation of reference numerals

REFERENCE SIGNS LIST 1 transmissive image display plate, 2 convex lens plate, 3 divided light sources, 4 left and right video signal sources, 5 time division circuit, 6 division control circuit, 7 multiple video signal sources, 8 multiple time division circuits, 9 multiple division control circuits, 10 Plane division control circuit, 11 left / right position detector, 12 division position movement circuit, 13 light emission position left / right movement circuit, 14 plane position detector, 15 light emission position plane movement circuit, 16 distance detector, 17 light emission area left / right variable circuit, 18 Light emitting area plane variable circuit, 19 signal left / right switching circuit, 20 division position switching circuit, 21 light emitting area switching circuit, 22 signal up / down switching circuit, 23 signal distance switching circuit, 24 display stop circuit, 25 stereoscopic display mode change circuit, 26 whole surface Light emitting circuit, 27 plane display changing circuit, 28, 29, 30, 31 partial surface light source, 32 surface light source, 33, 34, 35, 36 optical shutter, 37 CRT light source, 38 Transmission image display board for shutter, 39 Toric lens, 40 High-speed scanning control circuit, 41 Full screen black display switching circuit, 42 Full screen black signal source, 43 Scan stop circuit, 44 Light emission stop circuit, 45 Linear light source.

Claims (3)

Equipped with LCD,
When sequentially displaying different images on the LCD,
A display device characterized in that every time a video signal for one field or one frame is input to the LCD, a full-screen black signal for causing the LCD to perform full-screen black display is input.   2. The display device according to claim 1, wherein a frequency at the time of screen scanning when the full screen black signal is input to the LCD is set higher than that of the video signal. 2. The display device according to claim 1, wherein a period in which no input signal is provided is provided between the input of the video signal and the input of the full-screen black signal in the LCD.

Images