JP2744478B2 - 3D display device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field requiring three-dimensional video, a three-dimensional display device such as a three-dimensional television, a three-dimensional videophone, and a three-dimensional VTR device.

[Conventional technology]

Conventionally, there is a stereoscopic display method using glasses such as a polarized glasses method and a liquid crystal shutter method as a means for displaying a stereoscopic image, and a method using a lenticular lens has been devised as a stereoscopic display method without using glasses.
The principle will be described with reference to FIG.

FIG. 7 shows an example in which a lenticular lens sheet 22 is directly attached to the display surface of a display unit 21 (for example, a liquid crystal display, a CRT, a plasma display, etc.). Video signals input from four cameras) are arranged in order as 1,2,3,4,1,2,3,4,.... The principle of the stereoscopic vision is that the video signal 3 is projected to the right eye 31 and the video signal 2 is projected to the left eye 32 of the observer 30 through the semi-cylindrical lens 23 of the lenticular lens sheet 22, and the video signals 3 and 2 are projected. Due to the binocular parallax, a three-dimensional effect is generated. Here, p indicates a lens pitch.

On the other hand, there is a method of projecting an image as a method of performing a large-screen display. FIG. 8 is a diagram showing the principle of a transmission type stereoscopic projection apparatus. Plurality (four in this case) arranged at the distance between both eyes
Is composed of two lenticular lens sheets 22 bonded together such that a certain surface of the lenticular lens faces outside with a transmission type diffusion layer 25 interposed therebetween. When the image from each of the projection devices 24A to 24D passes through the two lenticular lenses, it is distributed in a direction corresponding to the direction of the projection devices 24A to 24D to give the observer 30 a stereoscopic view.

[Problems to be solved by the invention]

In the conventional example shown in FIG. 7, it is technically difficult to make the crystal display and the like of the display unit 21 large and high definition.
It is difficult to display on a large screen.

Also, in the conventional example shown in FIG. 8, since a plurality of camera-input images are projected using the plurality of projection devices 24A to 24D, the projection system becomes large, and the brightness decreases as the magnification increases. Problems such as a decrease in resolution occur. Further, since two lenticular lens sheets 22 are bonded, the precision required for bonding (aligning the positions of the two lenses) is very high. Therefore, there is a problem that the current technology is very difficult to manufacture.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a three-dimensional display device capable of increasing the screen size without lowering the luminance.

[Means for solving the problem]

The present invention sequentially collects the vertical display columns at the same position of each display image input using three or more cameras in the order of the predetermined numbers of the cameras, and vertically divides each pixel by the number of cameras. A signal synthesizing circuit that increases and expands to form one display column group, a display group that divides and displays a video signal synthesized by the signal synthesizing circuit, and a projection device group that projects an image of the display group The lenticular lens sheet is formed such that the side of the lenticular lens sheet where the lens is not formed is a focal plane of the lenticular lens sheet and a transmission type screen surface formed by coating of a diffusing material, and the display row group is formed of the lenticular lens. A lenticular screen projected onto the transmission screen surface so as to have a width of approximately one pitch. .

[Operation] In the invention described in claim (1) of the present invention, the projection device group projects the enlarged screen on the display group on the lenticular screen.

〔Example〕

FIG. 1 shows the configuration of a stereoscopic display device on which the present invention is based. In this figure, 1A to 1D represent a plurality of video input parts (4 in the figure).
) Cameras, 2A to 2D are video signals input from the cameras 1A to 1D, 3 is a signal synthesizing circuit, 4 is a display, 5 is a projection device, and includes a light source 6, lenses 7, and 8. . 1
Reference numeral 0 denotes a lenticular screen, the back surface of which is constituted by a transmissive diffusion layer 12, and which is constituted by a lenticular lens sheet 11 having a focal plane on the diffusion layer 12. M indicates a subject. The details and configuration of each unit will be described below.

FIG. 2 (a) shows a case where a signal synthesized by the signal synthesizing circuit 3 based on the video signals 2A to 2D captured by the four cameras 1A to 1D shown in FIG. 5 shows an arrangement of video signals 2A to 2D.

FIG. 2 (b) is an enlarged view of a portion W in FIG. 2 (a). In the signal synthesis circuit 3, each video signal 2A to 2D is
Each pixel is decomposed into one vertical display column, and the vertical display columns corresponding to the same pixel position are collected to form a display column group. Each display column group has an order in which the display columns of the original image are arranged on the display surface. At this time, if the display pixels are square, the image on the display surface becomes a horizontally long image by the number of video signals. In order to solve this, a method of thinning out the display columns and adjusting the aspect ratio, a method of enlarging the screen in the vertical direction, and the like can be considered. The former method is shown in FIG.

In FIG. 3, every four vertical display columns of each of the video signals 2A to 2D are extracted to form a display column group, which is sequentially displayed on the display 4. Therefore, although the signals used in each of the video signals 2A to 2D are 1, the size of the image on the display 4 is equal to the size of the image of one camera. The latter method will be described together with enlargement of the screen in an embodiment of the present invention described later.

FIG. 4 is a plan view of the projection device 5 as viewed from above. The synthesized signal on the display 4 is projected on the diffusion layer 12 on the back surface of the lenticular lens sheet 11. Each of the video signals 2A to 2D from each of the cameras 1A to 1D scattered by the diffusion layer 12 is refracted through the lenticular lens sheet 11 in a direction corresponding to a photographing direction, thereby enabling stereoscopic viewing. The conventionally used projection method requires a large number of projection devices 5 and its adjustment is difficult. According to the three-dimensional display device described above, in principle, only one projection device 5 is required, and the components can be simplified.

In the binocular stereoscopic display performed by inputting two cameras, only a stereoscopic image of the subject M viewed from one direction can be viewed. However, as described above, the multiview stereoscopic display performed by inputting three or more cameras is performed. In the stereoscopic display, as the viewpoint of the observer 30 moves, a stereoscopic image viewed from the direction of the line of sight can be seen.

FIG. 5 is a diagram for explaining the principle of the method according to the embodiment of the present invention for displaying a large screen by using a plurality of the above-described stereoscopic projection devices. 4-1 to 4-16 indicate displays, respectively.
A display group is constituted as a whole. Each video signal 2A
4D in the horizontal direction to display ~ 2D without resolution degradation
This requires twice the amount of information, resulting in a screen that is four times longer in the horizontal direction. To avoid this, the screen must be enlarged vertically. For this reason, each pixel in the vertical direction is quadrupled, that is, four identical pixels are arranged to extend quadrupled in the vertical direction. Thereby, the display 4
-1 to 4-16, that is, 16 regions are formed. For one of the displays 4-1 to 4-16, one screen is divided and projected using one projector 5, that is, 16 projectors 5 shown in FIG. In this embodiment, one screen is divided into 16 and projected, but the number of divisions is not limited to this number.

FIG. 6 is a plan view of the embodiment of the present invention as viewed from above the projection apparatus. In this figure, reference numerals 5-1 to 5-2 denote projection devices, respectively, and a total of 16 projection devices 5-1 to 5-16 constitute a projection device group. In the second embodiment, the size of the lenticular screen 10 is four times larger in the vertical and horizontal directions than in the stereoscopic display device shown in FIG. 1 shown in FIG. 4-1 to 4-4 are used as displays, and 5-1 to 4-4 are used as projection devices.
Only 1-5-4 are shown.

〔The invention's effect〕

The three-dimensional display device according to the present invention sequentially collects display images input from a plurality of cameras, creates a display image enlarged in a horizontal direction and a vertical direction, and projects the display image on a lenticular lens by a plurality of projection devices. Therefore, it is possible to display the video signal without losing the information amount of the video signal. In particular, when the number of input cameras is large, the effect of improving the resolution is great. At the same time, it is possible to prevent a decrease in luminance due to a large screen.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a stereoscopic display device on which the present invention is based, and FIGS. 2 (a) and 2 (b) are diagrams showing an arrangement of video signals projected by the camera shown in FIG.
FIG. 3 is an enlarged view of a portion, FIG. 3 is a diagram for explaining a method of creating a composite signal, FIG. 4 is a plan view of the stereoscopic display device shown in FIG. 1 as viewed from above the projection device, and FIG. FIG. 6 is a plan view of the embodiment viewed from the top of a projection apparatus, FIG. 7 is an explanatory view of a stereoscopic display method using a conventional lenticular lens, and FIG. It is explanatory drawing of another conventional example. In the figure, 1A to 1D are cameras, 2A to 2D are video signals, 3 is a signal synthesis circuit, 4,4-1 to 4-16 are displays, and 5,5-1 to 5-5.
-16 is a projection device, 6 is a light source, 7 and 8 are lenses, 10 is a lenticular screen, 11 is a lenticular lens sheet, and 12 is a diffusion layer.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kenji Akiyama 1-6-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-2-87792 (JP, A)

Claims (1)

(57) [Claims] 1. A three-dimensional display device using a lenticular lens sheet having a large number of lens-like lenses arranged side by side, a vertical display column at the same position of each display image input using three or more cameras. Are sequentially collected in the order of the predetermined numbers of the cameras, and the number of pixels is increased by the number of cameras in the vertical direction and expanded to form one display column group. A video synthesized by the signal synthesis circuit A display group for dividing and displaying a signal, a projection device group for projecting an image of the display group, and a side of the lenticular lens sheet where the lens is not formed is a focal plane of the lenticular lens sheet,
And a lenticular screen projected on the transmissive screen surface so that the display row group has a width of approximately one pitch of the lenticular lens. A stereoscopic display device characterized by the following.