JP3122528B2 - Display / imaging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In recent years, with the development of communication technology such as image coding technology, two-way video communication such as a TV telephone and a TV conference system connecting remote locations by a video / voice communication network has been rapidly spreading. . In the future, it is expected that a more realistic video service can be provided by the enhancement of the ISDN network and the increase in the bandwidth of the transmission network.

FIG. 3 shows a display / imaging device currently used for two-way video communication. An imaging device 2 is provided on an upper surface or a side surface of the display device 1 such as a CRT display, and captures an image of a user. However, since a user of such a device views the normal display device 1, even if an image is captured by the imaging device 2, the user does not look at the imaging device 2. For this reason, there has been a disadvantage that even if a video with a high sense of presence can be transmitted, the conversation becomes unnatural because the eyes of the interlocutors do not match.

[0004] In view of this, as a method for matching the eyes of the interlocutors and supporting a large-screen display used in a TV conference system or the like, a screen 3 for switching the light transmission / scattering state as shown in FIG. A method to be used has been proposed (JP-A-2-22893). In this method, the display device includes a display device including the display screen 3, the control device 4, and the projection display device 1, and an imaging device 2 disposed close to the projection display device 1. When the screen 3 is in the scattering state, the screen projected by the projection display device 1 is displayed, and in the transmission state, the user M as a subject is imaged by the imaging device 2 through the screen 3, thereby achieving eye-gaze matching. ing. Note that the control device 4 performs timing control of switching between the light transmission / scattering state of the screen 3 and switching between display and imaging.

[0005]

However, in the display / imaging system shown in FIG. 4, the Fresnel lens is not inserted between the screen 3 and the projection type display device 1.
There is a disadvantage that the brightness distribution of the display image projected on the screen is not uniform, and the periphery becomes dark. However,
If a Fresnel lens is simply inserted, an image of the user M is taken through the Fresnel lens at the time of imaging, and since the Fresnel lens itself acts as a telephoto lens for this imaging, the angle of view of the imaging is extremely large. It becomes narrow and unusable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to match a line of sight with a screen used for a TV telephone, a TV conference system, or the like, for switching a light transmission / scattering state. In a display / imaging device that has been realized, it is an object to improve the luminance of a display image and improve the image quality of a display image.

[0007]

In order to achieve the above object, a display / image pickup apparatus according to the present invention comprises a projection display apparatus, a screen and an image pickup apparatus, and the screen alternates between a light transmitting state and a scattering state. In a display / imaging apparatus that performs imaging when transmitting light and performs display in a scattered state, a part of the screen has an area forming a Fresnel lens structure, and imaging is performed by the imaging apparatus through a screen other than the area. It is characterized by performing.

[0008]

In the display / imaging device of the present invention, display is performed through a Fresnel lens structure provided in a partial area of the screen, and the luminance difference between the peripheral portion and the central portion of the screen is reduced to improve the image quality. On the other hand, imaging is performed from an area of the screen that does not have a Fresnel lens structure, and eye-gaze matching in imaging is realized without being affected by the angle of view limitation by the Fresnel lens.

[0009]

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

FIG. 1 is a sectional view of a screen used in the display / image pickup apparatus of the present invention. This screen is composed of a screen 3 for switching the light transmission / scattering state shown in FIG. However, in the Fresnel lens 6, the Fresnel lens structure is not formed over the entire screen, but the Fresnel lens structure 6a is formed only at the peripheral portion, and the Fresnel lens structure is not formed at the central portion. The feature is that it is a flat portion 6b. The projected light is usually diffused light, but in such a configuration, the light projected to the peripheral portion is not diffused, but becomes condensed light or parallel light and is incident on the screen 3. You. On the other hand, at the center, the diffused light is incident on the screen 3 as it is.

FIG. 2 shows a configuration diagram of a display / image pickup apparatus according to an embodiment of the present invention. This device comprises a screen comprising a screen 3 and a Fresnel lens 6, a projection type display device 1, an imaging device 2 and a control device 4. Except for using the screen shown in FIG. 1, the configuration is exactly the same as that shown in FIG. It is. That is, the image of the user M is taken by the imaging device 2 while the screen 3 is kept in the transparent state, and the image is displayed by the projection display device 1 while the opaque scattering state is kept. The control circuit 4 controls these timings. However, in the present embodiment, the imaging device 2 is installed so that imaging can be performed through the central flat portion 6b of the screen 3 where the Fresnel lens structure is not formed. As a result, imaging is not affected by the effect of the Fresnel lens.

As described above, in the present embodiment, since the Fresnel lens structure 6a is provided in the peripheral portion where the luminance of the display image is remarkably reduced, the projection light of the projection display device 1 is compared with the case where there is no Fresnel lens. Is not diffused, and a decrease in luminance of a display image at a peripheral portion of the screen can be reduced. For example, when there is no Fresnel lens, the difference in luminance between the central part and the peripheral part is 10 times or more. However, in the present embodiment, the luminance difference is reduced to about 、. Can be improved to such an extent that the difference in brightness between the two is not clear.

In this embodiment, a screen having a structure in which the center of the Fresnel lens is flattened is used. However, a similar effect can be obtained by using a screen in which the center of the Fresnel lens is hollowed out in a donut shape. Needless to say. As described above, the present invention can be variously applied according to the gist and can take various embodiments.

[0014]

As described above, the display / imaging device of the present invention uses a screen having a novel structure having a portion having a Fresnel lens structure and a portion having no Fresnel lens structure.
There is an advantage that the luminance distribution of the display image can be made uniform and the angle of view of imaging is not limited. That is, when there is no Fresnel lens, the difference in luminance between the central part and the peripheral part, which was 10 times or more, can be reduced to about １ ／ by the Fresnel lens structure, and the difference in luminance between the central part and the peripheral part is visually observed. Can be improved to a degree that is not clear, and imaging can be performed from a portion having no Fresnel lens structure without receiving the effect of the Fresnel lens.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a Fresnel lens used in a display / imaging device of the present invention.

FIG. 2 is a configuration diagram of a display / imaging apparatus showing one embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional display / imaging device.

FIG. 4 shows a conventional display that realizes eye-gaze matching for large-screen display.
Configuration diagram of imaging device

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Projection display apparatus 2 ... Imaging device 3 ... Screen 4 ... Control device 6 ... Fresnel lens 6a ... Fresnel lens structure part 6b ... Flat part

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shigenobu Sakai 1-1-6 Uchisaiwai-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (56) References JP-A-2-228893 (JP, A) JP-A Heisei JP-A-4-145788 (JP, A) JP-A-4-315139 (JP, A) JP-A-5-37928 (JP, A) JP-A-4-167690 (JP, A) JP-A-5-268597 (JP, A A) (58) Field surveyed (Int. Cl. ⁷ , DB name) H04N 7/10 H04N ^7/ 14-7/173 H04N ^7/ 20-7/22

Claims (1)

(57) [Claims] 1. A display / imaging device comprising a projection display device, a screen, and an imaging device, wherein the screen is alternately switched between a light transmitting state and a scattering state, an image is taken when light is transmitted, and a display is performed in a scattering state. A display / imaging device, wherein a part of the screen has a region forming a Fresnel lens structure, and an image is taken by the imaging device through a screen other than the region.