JPH06113296A - Display image pickup device - Google Patents

Abstract

PURPOSE:To realize coincidence of visual lines with inexpensive configuration and to improve the luminance of a display screen while suppressing fluctuation of luminance at an observing position in the display image pickup device for a large screen used for a video telephone set system or a video conference system. CONSTITUTION:A screen 3 comprising inexpensively plural infinitesimal screens 6 which are divided infinitesimally is used. Thus, a transparent region is formed through a gap of the infinitesimal screens 6 and an opaque region shielded by the very small screens 6 is formed depending on a viewing angle. A projection type display device 1 is used to project an image on the screen 3 from the opaque direction for the display. On the other hand, the image of the user M observing the display picture on the screen from the transparent direction through the screen 3 is picked up to realize the coincidence of visual lines. Furthermore, since the directivity of scattering of the infinitesimal screens 6 is small, the luminance fluctuation depending on the observing position by the user is suppressed and the luminance of the display screen is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display / image pickup device in which a display device and an image pickup device used in a TV telephone or a TV conference system are combined.

[0002]

2. Description of the Related Art In recent years, two-way video communication such as a TV telephone and a TV conference system in which remote locations are connected by a video / audio communication network has rapidly spread due to the development of communication technology such as image coding technology. . In the future, it is expected that a more realistic video service can be provided by enhancing the ISDN network and increasing the bandwidth of the transmission network.

FIG. 7 shows a display / imaging device currently used for two-way video communication. The image pickup device 2 is on the upper surface or the side surface of the display device 4 such as a CRT display, and images the user M looking at the display device 4. However, a user M who uses such a device usually sees the display device 4
Therefore, even if an image is taken by the imaging device 2, the line of sight is not directed toward the imaging device 4. Therefore, there is a drawback in that even if it is possible to transmit a highly realistic image, it becomes an unnatural conversation in which the line of sight of the interlocutors do not match.

Therefore, a method using a screen for switching the light transmission / scattering state has been proposed as a method capable of matching the line of sight of the interlocutors and supporting a large screen display used in a TV conference system or the like. (Japanese Patent Laid-Open No. 2-2
28893). In this system, as shown in FIG. 8, the display / imaging device switches the display screen 8, the projection display device 1 including the projection device, the imaging device 2, and the light transmission / scattering state of the screen 8. Control device 1
When the screen 8 is in the scattering state, the projection display device 1 projects the image on the back surface of the screen 8 to display the screen, and in the transmissive state, the user who is the subject through the screen 8. The line-of-sight match is realized by imaging M using the imaging device 2 in the frame 10.

A method using a transparent substrate having a visual field selection function (for example, Angle 21 manufactured by Nippon Sheet Glass Co., Ltd. or Sumitomo Chemical Co., Ltd. Lumisty Co., Ltd. is currently available) has been devised. (Japanese Patent Application No. 4-184831). In a screen having such a function, since transmitted light is scattered only in a certain visual field direction and appears opaque, as shown in FIG.
A display screen is projected by the projection display device 1 from the view direction of the screen 9 that appears opaque in the interior, and the user M is imaged through the screen 9 by the imaging device 2 from the transparent direction of the screen 9 in the frame 10 as well. Take In this example, compared with the method using the screen 8 of FIG. 8 for switching the light transmission / scattering state, the device configuration is simple and the line-of-sight matching can be easily realized.

[0006]

However, in the display / imaging system using the screen 8 for switching the light transmission / scattering state shown in FIG. 8, the display screen and the imaging screen do not flicker, so that the screen state can be changed at high speed. Therefore, the expensive control circuit 12 for controlling the screen 8, the projection type display device 1 and the imaging device 2 at high speed and the screen 8 capable of switching at high speed are indispensable. As a result, the structure of the device itself becomes complicated, and the device itself becomes expensive.

On the other hand, in the display / imaging method using the screen having the field-of-view selection function shown in FIG. 9, although the device configuration is simple and the line-of-sight matching can be easily realized, the brightness of the display screen is reduced due to the directivity of scattering. Since the maximum in the projection direction, the brightness in the front direction in which the user M looks at the display screen is extremely low, and the display screen becomes dark.

The present invention has been made to solve the above problems, and achieves line-of-sight matching with a low-cost configuration in a large-screen display / imaging device used in a TV telephone, a TV conference system, or the like. In addition, it is an object of the present invention to improve the brightness of the display screen by suppressing the brightness variation depending on the viewing position.

[0009]

To achieve the above object, in the present invention, in a display / image pickup device comprising a projection type display device, an image pickup device and a screen, the screen is composed of a plurality of minute screens. However, the image pickup device is configured to take an image through the gap between the minute screens.

[0010]

In the display / imaging device of the present invention, by using a screen inexpensively composed of a plurality of finely divided fine screens, transparent and opaque regions are created depending on the viewing angle, and a projected image is projected from the opaque direction. Then, the subject is imaged from the transparent direction to realize the line-of-sight match.
Moreover, since the directivity of the scattering of the minute screen is small, the luminance variation due to the difference in the position where the projected image is viewed is suppressed, and the luminance of the display screen is improved.

[0011]

Embodiments of the present invention will now be described in detail with reference to the drawings.

[Embodiment 1] FIGS. 1A and 1B are explanatory views seen from the side showing a screen configuration used in the first embodiment of the present invention. The screen 3 used in the present embodiment has a structure in which the screen 11 tilted by an angle θ is minutely divided into a plurality of minute screens 6 and the minute screens 6 are rearranged in a straight line. The front of the screen 3 can be seen through the gap. That is, when the screen 3 is viewed from an inclined direction that is ψ upward or downward from the normal direction of the screen 3, the screen 3 looks transparent through the gap of the minute screen 6, and from the direction further inclined, the minute screen 6 appears. It will be occluded and appear opaque.

Specifically, as shown in FIG. 1B, a transparent substrate (for example, Sumitomo 3M) having a minute louver, which corresponds to the case where the minute screen 6 is integrally formed, is incorporated.
A light control film manufactured by Shin-Etsu Polymer Co., Ltd. or VC FILM manufactured by Shin-Etsu Polymer Co., Ltd. is commercially available) can be used for the screen 3. In the screen 3 having such a structure, in the front direction, that is, in the direction normal to the screen 3, as described above, the fine screen 6 is used.
The opposite side of the screen 3 can be seen from the gap of the louver corresponding to, and the screen 3 becomes transparent. On the other hand, as it deviates from the normal direction, the minute screen 6
As a result, the field of view is blocked, and when the screen 3 is viewed from the direction tilted upward by ψ or downward by ψ ′ or more as shown in the figure, the screen 3 looks opaque as described above. Further, ψ and ψ ′ can be easily controlled by adjusting the interval d and the inclination θ of the minute screen 6.

FIG. 2 is a block diagram of the display / imaging device according to the first embodiment of the present invention. In the present embodiment, the screen 3 having the above-described configuration is arranged on one surface of the frame 10, the projection display device 1 is installed in the frame 10 in a direction opaque to the screen 3, and the minute screen 6 in the screen 3 is installed. The display image is projected on top. Since the fine screen 6 has a small scattering directivity, the brightness of the image projected on the fine screen 6, that is, the display screen does not vary depending on the viewing position of the user M, and is bright even from the front of the screen 3. You can see the screen. The imaging device 2 is installed on the frame 10 on the opposite side of the screen M to the user M, and is installed in the direction of the normal line which is transparent to the screen 3. You can As a result, since the user M is looking at the screen 3, that is, the imaging device 2, it is possible to realize the line-of-sight match between the interlocutors. However, since the inside of the frame 10 of the display / imaging device is actually visible to the user M, the inside of the frame 10 of the display / imaging device is projected by making the parts other than the projection display device 1 black and dark. It is preferable that no other objects than the displayed image can be seen.

[Embodiment 2] FIG. 3 is a sectional view of a screen using the display / imaging device of the second embodiment of the present invention, and FIG. 4 is a block diagram of the display / imaging device according to the second embodiment of the present invention. Show. In the screen shown in FIG. 3, a Fresnel lens 7 is arranged on the projection type display device 1 side of the screen 3 shown in FIG. However, in the Fresnel lens 7, the region where the Fresnel lens structure 7a is formed is only the peripheral portion, and the central portion is an ordinary flat transparent substrate or opening. The projection display device 1 is installed in the frame 10 in the opaque direction of the screen 3 as in FIG. 1, and the imaging device 2 is installed in the transparent direction of the screen 3 toward the center of the Fresnel lens 7. It Normally, in a projection display,
The Fresnel lens 7 is inserted between the screen and the projection type display device to mitigate the decrease in brightness in the peripheral portion of the display image.
Therefore, in the configuration shown in FIG. 2, since the Fresnel lens 7 is not inserted, there is a concern that the central portion of the display image projected on the screen 3 will be bright and the peripheral portion will be dark. However, if the Fresnel lens 7 is simply installed, the image is taken through the Fresnel lens 7, and since the Fresnel lens 7 itself acts as a telephoto lens for image pickup, it is possible to take an image in a desired range. Disappear. On the other hand, in the present embodiment shown in FIG. 4, since the image is taken through the central region where the Fresnel lens structure 7a is not present, the effect of the above-mentioned telephoto lens can be obtained and an image of a desired range can be taken, and at the same time, the display image It is possible to prevent a decrease in brightness around the area. In this embodiment, although a slight decrease in brightness is observed in the central part, it is sufficiently brighter than in the peripheral part, and the brightness distribution can be made uniform.

[Embodiment 3] FIG. 5 shows a block diagram of a third embodiment of the display / imaging device according to the present invention. In the configuration shown in FIG. 3 or 4, there is a concern that the display image of the projection display device 1 reflected or scattered by the screen 3 may be reflected in the imaging device 2. On the other hand, in the present embodiment shown in FIG. 5, crossed Nicols polarizing plates 5a and 5b are installed in front of the projection display apparatus 1 and the image pickup apparatus 2, respectively. Thereby, the polarizing plate 5 installed in front of the projection display device 1
Since the polarization direction of the projection image by a and the polarization direction of the deflection plate 5b installed in front of the image pickup device 2 are different by 90 °, the display image reflected or scattered by the screen 3 is not reflected on the image pickup device 2. . Further, when a liquid crystal projector is used for the projection display apparatus 1 with this configuration, the projection light itself is linearly polarized, so that it is not necessary to install the polarizing plate 5a in front of the projection display apparatus 1.

In the above embodiment, the projection type display device 1 is used.
Although the case where the imaging device 2 is installed above is shown, by changing the configuration of the minute screen 6 of the screen 3,
It goes without saying that it can be installed below or to the side. Although the case of the rear projection type has been described, it is obvious that the front projection type as shown in FIG. 6 has exactly the same effect. At that time, instead of the projection type display device 1 in FIG.
It is also possible to use the display device 4 and the micro mirrors having the same shape instead of the micro screen 6 constituting the screen 3. In that case, there is an advantage that the display screen does not appear on the imaging device 2. As described above, the present invention can be variously applied and various embodiments can be taken in line with the gist thereof.

[0018]

As described above, the display / display of the present invention
The image pickup device has an advantage that a display / image pickup device capable of line-of-sight matching can be realized easily and inexpensively only by installing a screen for a projection display device, which is composed of a plurality of minute screens, in front of the image pickup device. Further, since the projection image is projected on the minute screen, the directivity of the scattering of the screen is reduced, and the brightness variation of the display screen depending on the viewing position of the screen can be reduced.

According to the second aspect of the present invention, it is possible to realize the above-mentioned line-of-sight matching, in particular, while improving the brightness of the peripheral portion of the display screen.

Further, according to the invention of claim 3, in particular,
The above-mentioned line-of-sight matching can be realized while preventing the display screen from being reflected.

[Brief description of drawings]

1A and 1B are views showing a display of a first embodiment of the present invention.
Explanatory view seen from the side showing the configuration of the screen used in the imaging device

FIG. 2 is a configuration diagram of a display / imaging device according to the first embodiment.

FIG. 3 is a sectional view of a screen used in a second embodiment of the present invention.

FIG. 4 is a block diagram of a display / imaging device according to the second embodiment.

FIG. 5 is a configuration diagram of a display / imaging device according to a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a display / imaging device showing a modified example of the present invention.

FIG. 7 is a configuration diagram showing a first example of a conventional large-screen display / imaging device that achieves line-of-sight matching.

FIG. 8 is a configuration diagram showing a second example of a conventional large-screen display / imaging device that realizes line-of-sight matching.

FIG. 9 is a configuration diagram showing a third example of a conventional large-screen display / imaging device that realizes line-of-sight matching.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Projection type display device 2 ... Imaging device 3 ... Screen 5a, 5b ... Polarizing plate 6 ... Micro screen 7 ... Fresnel lens 7a ... Fresnel lens structure

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigenobu Sakai 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (3)

[Claims] 1. A display / imaging device comprising a projection display device, an imaging device, and a screen, wherein the screen is composed of a plurality of minute screens, and an image is taken by the imaging device from a gap between the minute screens. A display / imaging device characterized by the above. 2. The display according to claim 1, wherein a part of the screen on the side of the projection type display device has a region having a Fresnel lens structure, and an image is taken by the image pickup device through a screen other than the region. -Imaging device. 3. A cross-nicol polarizing plate is arranged on the front surface of each of the projection type display device and the image pickup device, or a polarization direction and a crossed nicol polarizing plate of the projection type display device are arranged on the front face of the image pickup device. The display / imaging device according to claim 1 or 2.