JPH10254078A - Three-dimensional display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a three-dimensional display device by a video surface moving system by an easy means by vibrating one end of a screen in a back-and- forth direction so that progressive wave may be generated, and projecting a picture in accordance with the amplitude displacement of the screen to the screen so that a stereoscopic picture having depth may be reflected. SOLUTION: The vibration of the screen 2 applied by the movement of the arm part 11 of a vibration generator 1 becomes the progressive wave propagated to sine wave. In a state where the amplitude direction of the vibration of the screen 2 is set as depth, the picture read out from a picture memory 5 synchronizing with the amplitude displacement of the screen 2 under the control of a display controller 6 is projected to the screen 2 so that the stereoscopic picture may be reflected. In such a case, by reading out the data in accordance with the temporally changed amplitude displacement of the screen 2 under the control of the controller 6, the picture in accordance with the different amplitude displacement of the screen 2 is successively reflected on the screen 2, consequently, the stereoscopic picture is reflected.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional display device for displaying an image by a moving image plane.

[0002]

2. Description of the Related Art Conventionally, as this type of stereoscopic display device,
There is a flat screen moving method in which a two-dimensional image is projected in synchronization with the moving speed while reciprocating the flat screen in the image projection direction (1).
Publication "OPTRONICS No. 1" published in 996
1 "p. 184). However, it is difficult to stably move the flat screen back and forth, and the projected image flickers.

Further, there is a conventional spiral screen rotating system in which a double leaf spiral (Archimedes spiral) screen is coaxially rotated and an image is projected on a rotating shaft portion of the spiral screen (issued in 1996). Publication "OPTRONICS No.11" P185
reference). However, the rotation of the screen does not cause a flickering of the projected image, but the image can be projected only on a part of the screen, and the structure is complicated and large.

[0004]

The problem to be solved is that, when performing a three-dimensional display of an image by the image plane moving method, the image flickers unless the movement of the screen serving as the image plane is smooth. Taking measures such as rotating the biplane screen coaxially in order to obtain a smooth displacement means that the structure becomes complicated and large.

[0005]

A three-dimensional display device according to the present invention is based on an image plane moving system, and is provided with a vibrating means so that a smooth screen displacement can be stably obtained by a simple structure. A flexible screen having one end connected to the vibrating means and being vibrated and the other end being a free end; an amplitude displacement detecting means for detecting an amplitude displacement of the vibration of the screen; Image projection means for projecting an image, image storage means for storing a plurality of image information of the image projected on the screen,
Display control means for selectively reading out the image projected by the image projection means from the image storage means in synchronization with the amplitude displacement of the screen detected by the amplitude displacement detection means; The image read out from the image storage means is projected on the screen in synchronization with the amplitude displacement, with the amplitude direction of the vibration as the depth.

[0006]

FIG. 1 shows a stereoscopic display apparatus according to the present invention.
As shown in FIG. 5, a vibration generator 1 that generates a fixed-period vibration by reciprocating the arm 11 back and forth with a predetermined stroke, and one end is connected to the arm 11 of the vibration generator 1 to apply vibration. A flexible screen 2 whose other end is a free end; an amplitude displacement detector 3 for detecting an amplitude displacement of vibration of the screen 2; a projector 4 for projecting an image on the screen 2; And an image memory 5 for storing a plurality of pieces of image information of images projected on the screen 2 in synchronism with the amplitude displacement of the screen 2 detected by the vibration displacement detector 3.
And a display controller 6 which selectively reads out the data from the display controller 6.

The vibration of the screen 2 applied by the movement of the arm 11 of the vibration generator 1 becomes a traveling wave propagating in a sine wave as shown in FIGS. Then, with the amplitude direction of the vibration of the screen 2 as the depth, an image read from the image memory 5 is projected on the screen 2 in synchronization with the amplitude displacement of the screen 2 under the control of the display controller 6, and a stereoscopic image is displayed. It has become.

The other end of the screen 2 may be in a completely free state. However, if the other end is attached to guide means for freely moving the other end in the front-rear direction, the screen 2
Can be stabilized more effectively.

Further, if the portion of the screen 2 is installed in a transparent case in a reduced-pressure atmosphere or vacuum, the vibration can be further stabilized.

Here, as the vibration displacement detector 3, in order to see the amplitude displacement of the vibration of the screen 2, the vibration generator 1 is used.
Is detected.

Alternatively, as shown in FIG. 4, an amplitude displacement at an arbitrary position on the screen 2 may be directly detected by using an optical displacement detector 3 '.

Further, it is possible to indirectly detect a change in the amplitude of the vibration of the screen 2 by a drive signal for moving the arm 11 of the vibration generating means 1 without providing any vibration displacement detector.

The image memory 5 stores data of a plurality of images necessary for stereoscopic display with depth.

FIG. 5 shows the storage state of a plurality of images for stereoscopic display with depth for the sake of convenience. Here, the data of each of the images A, B, and C (X-Y two-dimensional image) is stored in the image memory 5 as an address with the positional relationship shifted back and forth in the depth (Z direction). Data of the images A, B, and C are sequentially read from the image memory 5 in synchronization with the displacement. Then, the images A, B, and C are projected on the screen 2 that vibrates back and forth with a predetermined amplitude, so that a stereoscopic image as shown in FIG. 6 can be obtained.

FIG. 7 shows another storage state of each data of the images A, B and C. In this case, the images are stored in such a manner that a part of each image overlaps, and as shown in FIG. 8, a three-dimensional image in which the overlapping part of each image can be seen through is displayed on the screen 2.

FIG. 9 spatially shows the timing when each data of the images A, B and C shown in FIG. 5 is read out from the image memory 5 in synchronization with the amplitude displacement of the screen 2 at a certain vibration. .

In the relationship shown in FIG. 9, based on the detection signal from the amplitude displacement detector 3, the display controller 6 samples each sampling position Sx (x = 1, x = 1, 2) in the horizontal direction of the screen 2 (the propagation direction of the traveling wave). , 2), and the image data stored at the address corresponding to the amplitude at each sampling position is read. Here, data corresponding to each part of Dl, Dm, and Dn is read according to the vibration displacement of the screen 2 at a certain time.

As described above, data is read out according to the time-dependent vibration displacement of the screen 2 under the control of the display controller 6, so that the screen 2 sequentially displays images corresponding to the different amplitude displacements. Is projected,
As a result, a stereoscopic image is projected.

At this time, the frequency of the screen 2
The frequency is set to such a degree that the projected three-dimensional image does not flicker, for example, 30 Hz.

In the configuration shown in FIG. 1, an image is projected from the front of the screen 2 and a three-dimensional image is projected on the back of the screen 2 by transmitted light. In the figure, reference numeral 7 denotes a contact glass.

FIG. 10 shows another configuration example of the present invention. Here, a half mirror 8 is provided in front of the screen 2, and the half mirror 8 reflects the half mirror 8 to project a projection image from the projector 4 onto the screen 2. I am trying to project a stereoscopic image.

[0022]

As described above, in the three-dimensional display device according to the present invention, a traveling wave is generated by applying longitudinal vibration to one end of the sturine, and an image corresponding to the amplitude displacement of the screen is projected on the screen. By doing so, a stereoscopic image having a depth can be displayed, and a stereoscopic display device using a video plane moving method can be realized by simple means.

According to the present invention, a smooth displacement of the screen can be obtained stably, and a flicker-free three-dimensional image can be displayed. In addition, the entire screen can be effectively used as a projection surface without needless space, and downsizing can be effectively achieved.

[Brief description of the drawings]

FIG. 1 is a simplified configuration diagram showing an embodiment of a stereoscopic display device according to the present invention.

FIG. 2 is a perspective view of a portion including a vibrating arm, a screen, and a projector in the embodiment.

FIG. 3 is a characteristic diagram illustrating vibration of a screen.

FIG. 4 is a diagram showing an example of a unit for directly detecting an amplitude displacement at an arbitrary position on a screen.

FIG. 5 is a conceptual diagram spatially showing an example of a storage state of a plurality of images for stereoscopic display with depth.

FIG. 6 is a diagram showing a projection state of a plurality of images of FIG. 5 on a screen.

FIG. 7 is a conceptual diagram spatially showing another example of a storage state of a plurality of images for stereoscopic display with depth.

8 is a diagram showing a state of projection of a plurality of images of FIG. 7 onto a screen.

9 is a diagram spatially showing a timing when data of a plurality of images in FIG. 5 are read out from an image memory in synchronization with an amplitude displacement of a screen at a certain vibration point.

FIG. 10 is a simplified configuration diagram of a screen and a projector in another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration generator 2 Screen 3 Vibration displacement detector 4 Projector 5 Image memory 6 Display controller 8 Half mirror 11 Vibration arm

Claims (4)

[Claims] 1. A vibrating means, a flexible screen having one end connected to the vibrating means to be vibrated and the other end being a free end, and an amplitude displacement detecting an amplitude displacement of the vibration of the screen. Detecting means, image projecting means for projecting an image on the screen, image storing means for storing a plurality of pieces of image information of the image projected on the screen, and the amplitude displacement detecting means for detecting the image projected by the image projecting means Display control means for selectively reading out from the image storage means in synchronization with the amplitude displacement of the screen detected by the apparatus. A three-dimensional display device wherein an image read from an image storage means is projected on a screen. 2. An image is projected from the front of the screen,
3. The three-dimensional display device according to claim 1, wherein a three-dimensional image is projected on the back of the screen. 3. A half mirror is provided in front of the screen, an image is reflected on the half mirror and an image is projected on the screen, and a three-dimensional image is projected on the front of the screen through the half mirror. The stereoscopic display device according to claim 1, wherein: 4. The three-dimensional display device according to claim 1, wherein the screen is set in a reduced-pressure atmosphere or a vacuum.