JPH09168141A - Display device with image pickup device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain coincidence with a sight of line of a viewer by using a transparent hologram screen so as to generate a display image thereby picking up an image of the viewer seen through a rear side of the screen. SOLUTION: A display device 11 uses a back light source 12 to emit light to a display image on an LCD panel 13 and an image of a signal light 31 recording display information is formed onto a hologram screen 15 via an image forming optical system 20. The hologram screen 15 is provided with a diffusion plate consisting of a transparent hologram and a viewer 81 visualizes display information by a hologram diffused light 33 generated therein. The refracting characteristic of the hologram is matched so that a center angle of the diffused light 32 is in a direction of the viewer 81 at an incident angle of the signal light 31. The hologram screen 15 acts as a transparent plate in other angles and an image pickup camera 25 picks up an image of the viewer 81 in front of the screen seen through the rear side of the hologram screen 15. The incident light axis of the image pickup camera 25 is arranged close to a sight of line of the viewer 81 viewing the center of the hologram image.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device with an image pickup function used for a video conference, a videophone and the like.

[0002]

2. Description of the Related Art There is an interactive device in which a plurality of people at remote places such as a videophone and a video conference exchange information while visually observing the display image of the other party in real time. A terminal device that constitutes such a device photographs a person sitting in front of the terminal device, transmits the image to the other party, and at the same time visually recognizes the image of the other party received from the other party's terminal device on the screen, giving a sense of realism to both parties. It enables remote communication with a certain amount.

A display device 90 having such an image pickup function
As shown in FIG. 4, a camera 92 for photographing is attached above the display screen 91 to photograph the viewer 81, and at the same time, the image of the other party is displayed on the screen 91. However, in the display device 90, since there is a difference in the direction of the line of sight 811 of the viewer 81 and the direction of the light ray 921 captured by the camera 92, the line of sight of the opponent displayed on the screen and the line of sight 811 of the viewer 81 match. However, there is a problem that it is inevitable to feel a slight discomfort.

Therefore, in order to match the line of sight with the interlocutor, as shown in FIG. 5, a hologram element 93 having a good light-transmitting property is arranged immediately in front of the screen 91, which is the same as the line of sight 811 of the viewer 81. The light 82 directed to the hologram element 93
There is proposed a new display device 9 in which the reflected (diffracted) light is reflected (diffracted) and the reflected (diffracted) light 821 is photographed (see Japanese Patent Laid-Open No. 5-328336).

That is, a reflection type hologram element 93 is provided on the front of the display screen 91, and the vicinity of the eyes of the viewer 81 and the screen 91 are controlled.
Light 82 traveling along a line connecting the vicinity of the center of the camera 9
By making the light incident on 2, the deviation between the line of sight of the viewer 81 and the line of sight of the display image (interlocutor) is eliminated. In the figure,
Reference numeral 83 is a display light emitted from the screen 91, and reference numeral 83
Reference numerals 1 and 832 are a component of the display light 83 that passes through the hologram element 93 and reaches the viewer 81, and a component of the display light 83 that is diffracted (reflected) by the hologram element 93.

[0006]

However, the improved display device 9 shown in FIG. 5 has the following problems. The first problem is that since the hologram element 93 has a wavelength selection region, faithful color imaging cannot be performed and faithful color display cannot be performed. That is, the diffracted light 821 photographed by the camera 92 is colored in a specific selected wavelength region, and the light 831 visually recognized by the viewer 81 is light obtained by removing the diffracted light 832 from the display light 83, and conversely. It is colored.

The second problem is that since the camera 92 for photographing is arranged in the upper front part of the screen 91, the design is lacking in simplicity, and the viewer 81 is given a feeling of pressure from above. is there. The present invention has been made in view of the above conventional problems, and it is possible to take a color image of a viewer from the direction of the line of sight of a viewer who is looking at the screen, and the image pickup means is arranged at the rear of the screen to provide an overall view. The present invention intends to provide a display device with an image pickup function that can be made compact.

[0008]

A display device according to a first aspect of the present invention is a display device capable of photographing a state of a viewer looking at a display screen, the display device emitting a signal light recording display information, and a diffuser. A transparent hologram screen with a plate recorded on it,
It has an image forming optical system for forming an image of the signal light of the display on the hologram screen, and an image pickup means for seeing through a viewer in front of the hologram screen from behind the image.

In the present invention, it should be particularly noted that
The hologram screen that recorded the diffuser is transparent,
The image pickup means is to see through and photograph a viewer in front of the hologram screen from behind. Since the holographic screen is transparent, that is, it transmits diffused light as a screen for light incident from a specific direction and transmits light as it is, it is possible to see through the rear side of the screen and photograph the front. It will be possible. Therefore, the image pickup means can be arranged on the back side of the screen, and the image pickup means does not project to the front of the device, so that the entire device can be compactly assembled.

Further, since the screen is transparent, that is, for the light incident from a specific direction, the light is transmitted as it is except that it emits diffused light as a screen, so that the image pickup means displays a color in front of the viewer in front of the screen. It can be taken as a video. Since the screen is transparent but has a hologram recorded with a diffuser plate, the hologram part is irradiated with reproduction light from a predetermined angle to form a real image, and the hologram is directed toward the front of the screen. The image formation display image can be transmitted at a diffusion angle corresponding to the characteristics of the diffusion plate and can be visually recognized by the viewer.
Since the image pickup means is arranged behind the hologram screen, the light diffused and radiated by the hologram screen and traveling forward does not enter the image pickup means.

The hologram constituting the hologram screen may be a transmissive hologram as described in claim 2 if the optical path is constructed so that diffracted light is directed forward, or claim 3 As described above, a reflection hologram may be used. Further, as described in claim 4, the line connecting the central part of the light entrance part of the image pickup means and the vicinity of the viewer's eyes is between the center part of the image formation on the hologram screen and the vicinity of the viewer's eyes. It is preferable to match the line connecting the lines as much as possible. This is because, as the two lines are parallel and closer to each other, the line of sight of the other party visually recognized by the viewer and the line of sight of the viewer become closer to each other.

As described above, according to the present invention, it is possible to take a color image of the viewer from the direction of the line of sight of the viewer who is looking at the screen, and the image pickup means is arranged at the rear of the screen to make the whole compact. It is possible to provide a display device with an imaging function capable of performing the above.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 This example is a display device 1 capable of photographing a state of a viewer looking at a display screen, and as shown in FIG. 1, a display device 11 emitting a signal light 31 recording display information. , A transparent holographic screen 15 with a diffuser recorded, and a display 1
It has an image forming optical system 20 for forming an image of the signal light 31 of 1 on the hologram screen 15, and an image pickup means (camera) 25 for seeing through a viewer 81 in front of the hologram screen 15 from behind the screen.

The hologram forming the hologram screen 15 is a transmissive hologram. Further, a line 35 connecting the central part of the light entering part of the image pickup means 25 and the vicinity of the eye 81 1 of the viewer 81 connects the center part of the image formation on the hologram screen 15 and the vicinity of the eye 811 of the viewer 81. Approximately matches the line.

The following is a supplementary explanation for each.
The display device 11 that emits the signal light 31 includes a backlight light source 12 and an LCD (liquid crystal) panel 13, and a reference numeral 12
Reference numerals 1 and 122 denote a light source of the backlight light source 12 and a reflector. Then, the light is emitted from the back of the LCD panel 13,
The signal light 31 recording the display image on the panel 13 is emitted.

The signal light 31 is reflected by the mirror 21 which constitutes the image forming optical system 20, and then an image is formed on the hologram screen 15 by the image forming lens 22. The hologram of the hologram screen 15 has a diffusing plate recorded thereon, and the diffused light 32 spreads within the range of the diffusing angle of the diffusing plate, whereby the display image is within the range of the diffusing angle of the diffusing plate. Person 81 will be able to see it. And
The incident angle of the signal light 31 and the diffraction characteristic of the hologram are matched so that the central angle of the diffused light 32 (the direction in which the intensity of the diffused light 32 is strongest) is in the direction of the viewer 81.

Further, the hologram screen 15 acts as a mere transparent plate for the light other than the incident direction of the signal light 31. The light incident portion of the camera 25 disposed behind the hologram screen 15 is directed to the viewer 81, and the viewer 81 looks through the hologram screen 15 and looks at the screen. can do. Also, the viewer 81 can visually recognize the background of the hologram screen 15, but since the luminance of the display image is much higher than the luminance of the background, it is necessary to recognize only the display image when not particularly gazing. Become.

Then, unlike the conventional device, the camera 25
Since it is possible to easily match the shooting direction 35 of the image with the line-of-sight direction of the viewer 81, the line-of-sight of the viewer 81 and the line-of-sight of the other person displayed on the screen match, and a natural conversation without discomfort is possible. Become. Further, since it is not necessary to dispose the camera 25 in front of the screen, the space occupied by the apparatus is reduced, and the presence of the camera 25 does not give a feeling of oppression to the viewer 81.

Further, the hologram screen 15 and the camera 25 can be tilted and folded in the direction of the arrow in FIG. 1, and when they are not used, they can be tilted to be compactly folded. In addition, although a slight deviation occurs between the direction of the line of sight of the viewer 81 and the imaging direction, the camera 25
May be arranged beside the mirror 21 and housed inside the case. Alternatively, the hologram screen 15 and the camera 25 may be arranged behind the mirror 21 and the whole may be housed in a case.

The hologram of the hologram screen 15 can be manufactured by the exposure method shown in FIG. That is, the optical path of the coherent light 35 emitted from the laser light source 41 is bent by the mirror 42 and then split by the half mirror 43 into an optical path for the object light 36 and an optical path for the reference light 37. And the light 3 that exited on one side (left side of the paper)
Reference numeral 51 denotes a mirror 441, an objective lens 442, an off-axis parabolic mirror 443, which converts the light into parallel light, transmits the diffusion plate 45 to form the object light 36, and enters the photosensitive material 80 via the half mirror 47. .

On the other hand, the other light 3 emitted from the half mirror 43
52 is an objective lens 463 through mirrors 461 and 462.
After that, the light is converted into divergent light, and then enters the photosensitive material 80 as the reference light 37 via the half mirror 47. As a result, a transmission hologram in which the diffusion plate 45 is recorded is formed on the photosensitive material 80. As a result, if the hologram screen 15 is irradiated with reproduction light from the direction of the reference light 37 in FIG.
The diffracted light transmitted through the hologram screen 15 is the same as the light diffused by the diffuser 45.

Embodiment 2 As shown in FIG. 3, this embodiment is another embodiment in which the hologram of the hologram screen 16 is a reflection type in Embodiment 1 as shown in FIG. That is, the signal light 31 enters from the front side of the hologram screen 16, and the viewer 81 visually recognizes the reflected diffracted light (diffused light 32).

Therefore, the display 11 and the imaging optical system 20
Are arranged in the opposite direction to FIG. Further, in the exposure process of the hologram screen 16, the optical path is configured such that the object light 36 and the reference light 37 in FIG. Regarding the other points, the first embodiment
Is the same as

[0024]

As described above, according to the present invention, it is possible to take a color image of the viewer from the direction of the line of sight of the viewer who is looking at the screen, and the image pickup means is arranged at the rear of the screen to make the whole compact. It is possible to obtain a display device with an imaging function that can achieve

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a display device with an imaging function according to a first embodiment.

FIG. 2 is a system configuration diagram showing an exposure process of the hologram screen of the first embodiment.

FIG. 3 is a system configuration diagram of a display device with an imaging function according to a second embodiment.

FIG. 4 is a perspective view showing an example of a basic configuration of a conventional display device with an imaging function.

FIG. 5 is a side view showing the basic configuration of another conventional display device with an imaging function.

[Explanation of symbols]

 11. . . Indicator, 15. . . Holographic screen, 20. . . Imaging optical system, 25. . . 31. imaging means (camera); . . Signal light, 81. . . Viewer,

Claims (4)

[Claims] 1. A display device capable of capturing an image of a viewer looking at a display screen, the display device emitting signal light recording display information, a transparent hologram screen recording a diffuser plate, and An image pickup function comprising an image forming optical system for forming an image of signal light of a display on the hologram screen, and an image pickup means for seeing through and photographing a viewer in front of the hologram screen from behind the hologram screen. Display device. 2. The display device with an image pickup function according to claim 1, wherein the hologram forming the hologram screen is a transmission hologram. 3. The display device with an image pickup function according to claim 1, wherein the hologram forming the hologram screen is a reflection hologram. 4. The line connecting the central part of the light entering part of the image pickup means and the vicinity of the viewer's eyes according to any one of claims 1 to 3, A display device with an image pickup function, which is approximately coincident with a line connecting the part and the vicinity of the viewer's eyes.