JP3045341B2 - 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 with a video / audio communication network has been rapidly spreading. . In the future, the enhancement of the ISDN network and the increase in the bandwidth of the transmission network are expected to provide a more realistic video service.

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, since a user using such a device is looking at the normal display device 1, the user M does not look at the imaging device 2 even if an image is captured 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 apparatus that achieves eye-gaze coincidence, 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. 2-73400). ). FIG. 3 is a cross-sectional view of the semi-transmissive mirror 3 combined with the micro semi-transparent mirror 5, and FIG. In the drawing, θ indicates the inclination of the micro semi-transparent mirror 5. With such a configuration, as shown in the figure, 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 5 can be reduced, the size of the display / imaging device can be reduced compared to the conventional method in which one large semi-transparent mirror is installed at an angle. Note that FIG.
(A) W indicates the distance between the micro-semi-transparent mirrors 5,
In this example, W = 0.

[0005]

However, FIG.
In the case where the semi-transparent mirror 3 having the structure shown in FIG. 1 is used, a plurality of images are taken in addition to the image directly reflected from the reflecting surface, and the image quality of the taken image is remarkably deteriorated. Such image quality image deteriorating the, remarkable when integrally forming the minute half mirror 5 shown particularly in FIG. 3 (b), as shown in FIG. 5, the side wall after being reflected by the micro half mirror 5 4 and totally reflected by the back surface, and again through the micro-semi-transparent mirror 5, the light directly reflected from the micro-semi- transparent mirror 5 (normal reflection in the figure)
Taken with a normal reflection image in a slightly different direction
This occurs because the image is captured by the imaging device 2. In addition, the image from the original direction of incidence different since direction, passes through the side wall 4
Because the image totally reflected on the back surface passes through the micro semi-transparent mirror 5 again
This is because the image is captured by the image capturing apparatus 2 . That is, as shown in FIG. 3, a portion that becomes a shadow with respect to the imaging device 2 due to the adjacent micro semi-transparent mirror 5 is generated.
It can be said that the change occurs in the optical path of the reflected light. Therefore, in order to improve the image quality of the captured image, it is urgently necessary to eliminate the influence of the adjacent micro semi-transparent mirror 5.

An object of the present invention is to provide a display / imaging apparatus which realizes eye-gaze coincidence by using a semi-transparent mirror formed by combining a plurality of micro semi-transparent mirrors used in a TV telephone, a TV conference system, etc. An object of the present invention is to prevent image quality from deteriorating due to an image and improve image quality of a captured image.

[0007]

A display / imaging device according to the present invention is a semi-transparent mirror comprising a plurality of micro semi-transparent mirrors.
An interval is provided between the small semi-transparent mirrors.

[0008]

In the present invention, the reflected light is less affected by the adjacent micro-semi-transparent mirror, so that the quality of the captured image is improved.

[0009]

FIG. 1A is a sectional view of a semi-transparent mirror used in a display / image pickup apparatus according to the present invention. Compared with the conventional example shown in FIG. 3A, a space W is provided between the micro semi-transparent mirrors 5. If the interval W is set appropriately, there is no portion that becomes a shadow with respect to the imaging device 2 due to the adjacent micro semi-transparent mirror 5, and the optical path of the reflected light does not change.

FIG. 1B shows a cross-sectional view of the semi-transparent mirror 3 when the micro semi-transparent mirror 5 is integrally formed. The inclination φ of the side wall 4 in the figure is almost vertical in the conventional example shown in FIG. 3B, and there is almost no space W between the small semi-transparent mirrors 5, but in the present embodiment,
By providing the side wall 4 with a certain inclination φ, an interval W between the small semi-transparent mirrors 5 is provided. For example, if the inclination φ of the side wall 4 is set so as to satisfy the relationship of θ = 2θ with the inclination θ of the small semi-transparent mirror 5, the image reflected by the small semi-transparent mirror 5 is captured without being reflected or passed by the side wall 4. The image is captured by the device 2. As a result, no change occurs in the optical path of the reflected light, so that it is possible to prevent the image quality of the captured image from deteriorating. further,
In the extraordinary reflection as shown in FIG.
Therefore, by lowering the transmittance of the micro semi-transparent mirror 5,
Ghost generation can be completely prevented. At that time,
However, the reflectivity of the micro semi-transparent mirror 5 must be increased.
Therefore, the brightness of the reflected image can be improved. Anti
Surface, the transmittance of the micro semi-transparent mirror 5 is reduced,
The brightness of the display screen is reduced because the light transmittance is also greatly reduced.
Problem arises. However, in FIG.
As described above, when the configuration in which the space W is provided between the micro semi-transparent mirrors 5 is taken,
Talker M looks at the display screen between the small semi-transparent mirrors 5
By reducing the transmittance of the micro semi-transparent mirror 5
This has the effect of mitigating the reduction in the brightness of the display screen that occurs. Ma
In the configuration in which the side wall 4 is provided as shown in FIG.
4 has an extremely high transmittance, so that the caller M has the display screen
It will be seen through the wall 4 so that the brightness of the display screen is moderated.
I can sum up. In order to enhance this effect, it is necessary to
And the area of the side wall 4 is widened. Sand
In other words, it is sufficient to increase the inclination φ of the side wall 4, and the ghost is removed.
At the same time, the brightness of the display screen can be improved. example
For example, the inclination θ of the small semi-transparent mirror 5 is 25 °, and the inclination φ of the side wall 4 is
2θ = 50 °, and the transmittance is 30% and 70%, respectively.
In this case, compared to the case where the inclination φ of the side wall 4 is 0 °, the display screen
The brightness is improved by about 50%. Semi-transparent mirror 3 shown in FIG.
In the configuration described above, each of the micro semi-transparent mirrors 5
Act as a system. That is, incident on the semi-transparent mirror 3
As a result, the optical path of light is bent. as a result,
When viewing the display device 1 through the semi-transparent mirror 3,
It is equivalent to always looking in a certain direction. table
When a liquid crystal display is used for the display device 1,
Since the play depends on the viewing angle, the contrast ratio is high.
If you do not look at the display from
Will fall. Therefore, the optical path is bent by the semi-transparent mirror 3.
The viewing direction of the LCD display
There is a need. For example, the image is turned upward as shown in FIG.
In the configuration for projecting, the display screen is viewed through the micro semi-transparent mirror 5.
Use an LCD with an upward viewing angle.
Need to be. However, an interval W is provided between the micro semi-transparent mirrors 5.
When the semi-transparent mirror 3 is used, as described above,
Since the high area is the side wall 4 area, the display screen is substantially
4, and in the configuration shown in FIG.
It is necessary to use a liquid crystal display with a downward viewing angle
It is necessary.

Incidentally, the interval W in FIG.
It is determined in relation to the length, inclination θ, etc., and it is difficult to express numerically. Further, since the interval W can be calculated from the length of the side wall 4 and the inclination φ in FIG. 1B, the case of FIG. 1B is the same as the case where the interval W is provided. In short, the interval W for preventing the change of the optical path of the light reflected by the adjacent micro semi-transparent mirror 5
Should be fine.

[0012]

As described above, according to the present invention, by forming a semi-transparent mirror with a space between the micro-translucent mirrors , the reflection surfaces of the adjacent micro-translucent mirrors are mutually shadowed with respect to the imaging device.
Since there is no such portion, it is possible to prevent a change in the optical path of the reflected light due to the minute semi- transparent mirror, and to improve the image quality of the captured image.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a semi-transparent mirror used in a display / imaging apparatus according to an embodiment of the present invention.

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

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

FIG. 4 is a configuration diagram of a display / imaging device when a semi-transparent mirror is formed by combining a plurality of micro semi-transparent mirrors.

FIG. 5 is a diagram for explaining that a change occurs in an optical path of reflected light due to adjacent micro semi-transparent mirrors.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 display device 2 imaging device 3 semi-transparent mirror 4 side wall 5 minute semi-transparent mirror W interval between minute semi-transparent mirrors θ inclination between minute semi-transparent mirrors φ inclination of side wall

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-5-30504 (JP, A) JP-A-5-30503 (JP, A) JP-A-4-315390 (JP, A) JP-A-4-315 280582 (JP, A) JP-A-4-150684 (JP, A) (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. The display device, the imaging device, and the reflection direction are the same.
A semi-transmissive mirror comprising a large number of micro semi-transparent mirrors, the semi-transparent mirror is installed in front of the display device, and a subject in front of the display device is installed around the display device as a reflection image from the semi-transparent mirror. in the display image-capturing device for imaging by the imaging device that is, the between micro half Torukyo cross constituting the semi Torukyo, shooting reflective surface of adjacent small semitransparent mirror each other
A display / imaging device, wherein an interval is set so that a shadow portion does not occur with respect to the imaging device.