JP3209790B2 - 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. 2 shows a display / imaging device currently used for two-way video communication. The imaging device 2 is provided on the upper surface or side surface of the display device 1 such as a CRT display, and captures an image of the user M. However, those who use such devices,
Since the user views the normal display device 1, the user M does not look at the imaging device 2 even when the imaging is performed by the imaging device 2. For this reason, there has been a drawback in that even if it is possible to transmit a video full of a high sense of reality, the conversation between the interlocutors is unnatural because their eyes do not match.

[0004] In order to construct a small and inexpensive display / imaging device that achieves eye-gaze matching, a method of constructing a semi-transparent mirror by combining a plurality of minute semi-transparent mirrors has been devised (see Japanese Patent Application No. 2-273400). ). FIG. 3 is a cross-sectional view of the semi-transparent mirror 3 combined with the micro semi-transparent mirror 6, and FIG. 4 is a configuration diagram of a display / imaging device using the semi-transparent mirror 3 configured by combining the micro semi-transparent mirrors. FIG. 3A shows an example in which the small semi-transparent mirrors 6 are arranged at an inclination θ, and an interval W is set between adjacent small semi-transparent mirrors 6 (see Japanese Patent Application No. 3-236825).
(B) shows an example in which the micro semi-transparent mirror 6 is provided integrally on a transparent substrate such as glass, and an interval W between the micro semi-transparent mirrors 6 is provided by giving an inclination φ to the side wall 4. .

In such a configuration, as shown in FIG. 4, a part of the incident light is reflected in the angle 2θ direction. At this time, since the width d of the small semi-transparent mirror 6 can be reduced, the size of the display / imaging device can be reduced compared to a conventional method in which one large semi-transparent mirror is installed at an angle.

Further, by providing an appropriate interval W between the adjacent small semi-transparent mirrors 6, it is possible to remove a ghost caused by being imaged by the imaging device 2 after being totally reflected on the back surface of the semi-transparent mirror 3, and Since the amount of light transmission is increased by the interval W, a decrease in the brightness of the display screen caused by installing the semi-transparent mirror 3 in front of the display device 1 can also be improved.

[0007]

However, FIG.
When the semi-transparent mirror 3 having the configuration shown in FIG. 1A is used, the display screen of the display device 1 is imaged through the small semi-transparent mirror 6, and the display screen is reflected on the imaged screen. In particular, in order to improve the brightness of the display screen when viewed from the user M, the brightness of the display screen of the display device 1 is increased, for example, when a transmissive liquid crystal display (LCD) is used for the display device 1. In such a case, it is a simple method to increase the brightness of the backlight. However, as the display screen of the display device 1 becomes brighter, the amount of light that passes through the micro semi-transparent mirror 6 and enters the imaging device 2 increases. The reflection of the display screen on the image was remarkable.

Further, in the case of the semi-transparent mirror 3 integrally formed with the micro semi-transparent mirror 6 as shown in FIG.
It will act as a kind of prism. That is,
Since the direction of inclination between the reflecting surface of the micro semi-transparent mirror 6 and the side wall 4 is different, the transmitted light is refracted in exactly the opposite direction. For example, in the configuration shown in FIG. 4, light transmitted through the reflecting surface is refracted downward, and refracted upward on the side wall surface. Therefore, the image displayed on the display device 1 is transmitted through the semi-transparent mirror 3 to be separated into an image refracted upward and an image refracted downward.
You will see multiple images. In particular, when the LCD 1A is used for the display device 1 as shown in FIG. 5, the LCD 1A has a viewing angle dependency, and the display surface is moved from a certain viewing angle range, for example, from a downward viewing direction or an upward viewing direction. If you do not see it, the image quality will be extremely reduced.

In the above case, the double images seen by the user M have different viewing directions, and if one of them is adjusted to a good viewing angle direction, the other will always have a low contrast ratio and a poor image quality. Would. Therefore, even if the backlight of the LCD 1A is brightened in order to increase the brightness, the contrast deteriorates as a whole because the image has a low contrast other than the optimal viewing direction as shown in FIG.

As described above, the semi-transparent mirror 3 shown in FIG.
Has the disadvantage that the image quality of the display screen viewed from the user M is significantly deteriorated.

According to the present invention, by using a minute total reflection mirror instead of a minute semi-reflection mirror, it is possible to completely prevent the image quality from being deteriorated due to the reflection from the display screen or the like. It is an object of the present invention to provide a display / imaging device which prevents a decrease in image quality of a display screen caused by a difference in refraction of transmitted light.

[0012]

According to the present invention, there is provided a display / image pickup apparatus in which a semi- transparent mirror is formed integrally with one side of a flat transparent substrate.
Having a large number of micro total reflection mirrors formed,
At a certain angle that is not parallel to the substrate surface of the transparent substrate
The space between the adjacent minute total reflection mirrors is provided so as to have an interval for transmitting light when viewed from the subject, and the display screen is not reflected on the imaging device.

[0013]

According to the present invention, the use of the minute total reflection mirror prevents deterioration in image quality due to reflection from the display screen.

[0014]

FIG. 1A is a reference diagram for explaining a cross section of a semi-transparent mirror used in a display / image pickup apparatus according to the present invention. FIG.
The micro total reflection mirror 5 is used instead of the micro semi-transparent mirror 6 as compared with the conventional example shown in FIG. Since the space W is set between the adjacent minute total reflection mirrors 5, light is transmitted from the space W, and the function as the semi-transparent mirror 3 is achieved.
Is determined by this interval W.
Since the micro total reflection mirror 5 does not transmit any light, the display device 1
Even when the brightness of the display screen is increased, the display screen is not reflected on the imaging device 2, and the image quality of the display screen can be improved.

FIG. 1B is a sectional view of the semi-transparent mirror 3 when the minute total reflection mirror 5 is integrally formed. The user M looks at the screen displayed on the display device 1 through the region of the side wall 4 in the figure, and the transmittance of the semi-transparent mirror 3 is determined by the area of the region of the side wall 4,
That is, it is determined by the inclination φ of the side wall 4.
Also in this case, since no light is transmitted from the surface of the minute total reflection mirror 5, the display screen of the display device 1 is not reflected on the imaging device 2.

Further, as described above, in the case of the micro semi-transparent mirror 6, a double image is formed by an image transmitted through the reflecting surface and an image transmitted through the surface of the side wall 4, but in the case of the micro total reflecting mirror 5, the reflected image is transmitted through the reflecting surface. Since there is no image to be reproduced, it is possible to improve the deterioration of the display image due to the double image.

By appropriately selecting θ, W or φ and the thickness t of the semi-transmissive mirror 3, the user M can see all the displayed pixels, and the image obtained by using the minute total reflection mirror 5 can be seen. There is no loss.

[0018]

As described above, the present invention provides a semi-transparent mirror.
But many finely integrally formed on one surface of a flat transparent substrate
A small total reflection mirror, wherein the minute total reflection mirror is provided on the transparent substrate.
At a certain angle that is not parallel to the substrate surface and arranged between the adjacent micro total reflection mirrors so as to have an interval for transmitting light as viewed from the subject, the display screen is not reflected on the imaging device, It is possible to completely prevent image quality deterioration due to reflection from the display screen and the like, and to improve image quality deterioration of the display screen which occurs when a semi-transparent mirror integrally formed with the previously proposed micro semi-transparent mirror is used. Furthermore, since the semi-transparent mirror coating is not a half-mirror coating but a mirror coating, there is an advantage that a semi-transparent mirror having simple characteristics and uniform characteristics can be manufactured . In the present invention, the depth of the device, which is determined by the outer dimensions of the semi-transparent mirror in the direction perpendicular to the display screen, is determined only by the vertical thickness caused by the inclination of the single small total reflection mirror with respect to the display screen. Therefore, the depth of the device can be reduced.

[Brief description of the drawings]

FIG. 1 is a reference of a semi-transparent mirror used in the display / imaging device of the present invention.
It is a figure (a) and sectional drawing (b) of a semi-transmissive mirror .

FIG. 2 is a configuration diagram of a conventional display / imaging device.

FIG. 3 is a cross-sectional view of a semi-transparent mirror in which a plurality of previously proposed micro semi-transparent mirrors are combined.

FIG. 4 is a configuration diagram of a display / imaging apparatus in the case where a semi-transparent mirror is formed by combining a plurality of micro semi-transparent mirrors.

FIG. 5 is a diagram for explaining that a double image is generated when the display screen transmits through the reflection surface and the side wall surface.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 display device 2 imaging device 3 semi-transparent mirror 4 side wall 5 micro total reflection mirror 6 micro semi-reflection mirror

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hitoshi Arai Nippon Telegraph and Telephone Corporation, 1-6-1, Uchisaiwai-cho, Chiyoda-ku, Tokyo (56) References JP-A-2-37890 (JP, A) JP-A-Hei 5-145912 (JP, A) JP-A-5-56423 (JP, A) JP-A-4-315390 (JP, A) JP-A-4-223688 (JP, A) JP-A-4-154289 (JP, A A) JP-A-4-150684 (JP, A) JP-A-63-85529 (JP, A) JP-A-61-73133 (JP, A) JP-A-57-190234 (JP, A) JP-A-57 -158803 (JP, A) JP-A-52-79944 (JP, A) JP-A-63-37059 (JP, U) (58) Fields investigated (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 device, comprising an image pickup device and a semi-transparent mirror, wherein the semi-transparent mirror is provided on a front surface of the display device.
A display / imaging device that is installed substantially parallel to a display screen of the device and that captures an image of a subject in front of the display device as a reflection image from the semi-transparent mirror by the imaging device installed around the display device; The transparent mirror is integrally formed on one side of a flat transparent substrate.
A plurality of micro total reflection mirrors, wherein the micro total reflection mirror is
It is arranged at a fixed angle that is not parallel to the substrate surface of the transparent substrate and between the adjacent minute total reflection mirrors so as to have an interval for transmitting light when viewed from the subject, and the display screen is reflected on the imaging device. A display / imaging device characterized in that there is no such device.