JPH04315390A - Display/image pickup device - Google Patents

Abstract

PURPOSE:To prevent deterioration in picture quality due to a multiple reflection image and to improve the picture quality of a pickup picture by forming the title device with a display device, an image pickup device and a semitransparent mirror comprising lots of minute half mirrors and forming a reflection preventing layer onto a rear side of the semitransparent mirror. CONSTITUTION:The device is formed by a display device 1, an image pickup device 2 and a semitransparent mirror 30 comprising lots of minute semitransparent mirrors 5 and the half mirror 30 is placed in front of the display device 1. Then an object M in front of the display device 1 is picked up by the image pickup device 2 placed around the display device 1 as a reflecting image from the semitransparent mirror 30. A reflecting prevention layer 6 is formed to a rear side of the semitransparent mirror 30 and the reflectivity is adjusted to be reduced over the entire visual area by making the reflection prevention layer 6 to be a multi-layer. Thus, the reflection light intensity by the rear side is reduced and the brightness of the reflection image from the rear side of the semitransparent mirror appearing on the image pickup screen is reduced. Furthermore, when a liquid crystal display device is employed for the display device 1, a light diffusion layer is provided to the rear side of the semitransparent mirror 30 to widen the visual field angle.

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 that is a combination of a display device and an imaging device used in video telephones, video conference systems, and the like.

0002

[Background Art] In recent years, with the development of communication technologies such as image coding technology, two-way video communications such as video telephones and video conference systems that connect remote locations using video and audio communication networks have rapidly become popular. . In the future, it is expected that with the enhancement of ISDN networks and higher bandwidth transmission networks, it will be possible to provide video services with even greater realism.

FIG. 5 shows a display/imaging device currently used for two-way video communication. The imaging device 2 is located on the top or side of the display device 1 such as a CRT display, and the user M
image. However, since those who use such a device are looking at the normal display device 1, the user M does not turn his/her line of sight toward the imaging device 2 even if the imaging device 2 captures an image. As a result, even if it becomes possible to transmit highly realistic images, there is a drawback that the conversation becomes unnatural because the interlocutors do not see each other in the same line of sight. Therefore, in order to construct a compact and inexpensive display/imaging device that achieves line-of-sight alignment, a method was devised to construct a semi-transparent mirror by combining multiple microscopic semi-transparent mirrors (see Japanese Patent Application No. 2-273400).
.

FIG. 6 shows a cross-sectional view of a semi-transparent mirror made up of a combination of micro semi-transparent mirrors, and FIG. 7 shows a configuration diagram of a display/imaging device in which a semi-transparent mirror is constructed by combining a plurality of micro semi-transparent mirrors. 4 in the diagram
5 is a transparent substrate, and 5 is a microscopic semi-transparent mirror, both of which constitute a semi-transparent mirror 3. Further, θ indicates the inclination of the micro semi-transparent mirror 5, and w indicates the width. With such a configuration, part of the incident light will be reflected in the direction of a certain angle ψ, as shown in the figure. In this case, since the width w of the micro semi-transparent mirror 5 can be made small, the display/imaging device can be made more compact than the conventional method in which the semi-transparent mirror is installed at an angle.

[0005]

[Problems to be Solved by the Invention] However, when imaging is performed using a semi-transparent mirror 3 as shown in FIG. There was a drawback that the value decreased significantly. Images that cause such a reduction in image quality are multiple reflection images reflected on the back surface of the semi-transparent mirror 3 and images caused by the screen displayed on the display device 1 located behind the semi-transparent mirror 3. As shown in FIG. 8, the former is a reflected image totally reflected on the back surface of the semi-transparent mirror 3, and although the incident angle is different from the direct reflected image on the surface of the semi-transparent mirror 3, it is reflected in the direction of the imaging device 2. The image will be taken. The latter is because the display screen is directly reflected on the imaging screen. Even if there is no direct reflection, light from the display screen mixes into the image capture screen, causing the image capture screen to become washed out and lack sufficient contrast. Therefore, in order to improve the image quality of captured images,
There was an urgent need to remove these statues.

The present invention provides a display/imaging device that achieves line-of-sight alignment using a semi-transparent mirror constructed by combining a plurality of micro semi-transparent mirrors used in video telephones, TV conference systems, etc. The purpose is to prevent deterioration in image quality and improve the quality of captured images.

[0007]

[Means for Solving the Problems] A display/imaging device according to the present invention has an antireflection layer or a light scattering layer formed on the back surface of a semi-transparent mirror made up of a plurality of minute semi-transparent mirrors.

[0008]

[Operation] In the present invention, reflection of the image on the back surface of the semi-transparent mirror is prevented, and multiple reflected images that appear during imaging are removed.

[0009]

【Example】

(Embodiment 1) FIG. 1 shows a sectional view of a semi-transparent mirror 30 used in the display/imaging device of the present invention. Conventional semi-transparent mirror 3 shown in Figure 6
The main difference is that an antireflection layer 6 is formed on the back surface. By forming the antireflection layer 6 into multiple layers, the reflectance is adjusted to decrease over the entire visible range. This makes it possible to significantly reduce the intensity of reflected light from the back surface. As a result, the brightness of the reflected image from the back surface of the semi-transparent mirror 3 that appears on the imaging screen can be reduced.
The image quality of the imaging screen can be improved. (Embodiment 2) FIG. 2 shows a sectional view of another embodiment of the semi-transparent mirror 30 used in the display/imaging device of the present invention. A major difference from FIG. 1 is that a light scattering layer 6A is formed on the back surface. As the light scattering layer 6A, for example, minute irregularities are formed on the front surface of the back surface of the transparent substrate 4, and the irregularities scatter light to prevent reflection in a certain specific direction. As a result, the reflected image from the back surface of the semi-transparent mirror 30 appearing on the imaging screen can be completely removed. Furthermore, although the user of the display/imaging device of the present invention views the display screen through the light scattering layer, there is no significant deterioration in the image quality of the display screen.

Furthermore, in order to reduce the size of the display/imaging device, a liquid crystal display, which is a flat display, is sometimes used as the display device 1, but the liquid crystal display has the disadvantage of a narrow viewing angle. However, if the light scattering layer 6A is provided on the back surface of the semi-transparent mirror 30, the screen displayed on the liquid crystal display will be scattered in any direction.
It also has the effect of widening the viewing angle of the LCD display. (Embodiment 3) FIG. 3 shows a configuration diagram of a display/imaging device according to the present invention. Unlike conventional display/imaging devices, this embodiment uses a semi-transparent mirror 30 having an anti-reflection film layer 6 or a light scattering layer 6A on the back surface of a transparent substrate 4, and also uses a semi-transparent mirror 30 for time-sharing display and imaging. A control device 7 is newly added. That is, a period A for imaging and a period B for displaying are provided at the timing shown in FIG. The imaging device 2 performs imaging. Period B
In this case, no imaging is performed, and normal display is performed on the display device 1. By implementing such a configuration, it is possible to prevent the display screen from being reflected on the imaging screen. In particular, in the case of Example 2, the light scattered by the light scattering layer 6A provided on the back surface of the semi-transparent mirror 30 directly enters the imaging device 2, but in this example, this scattered light can be removed. Therefore, the image quality of the imaging screen can be significantly improved.

[0011]

As explained above, the present invention prevents reflection of images by providing an antireflection layer or a light scattering layer on the back surface of a semitransparent mirror made up of a plurality of microscopic semitransparent mirrors. This makes it possible to improve the image quality of the captured image.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a semi-transparent mirror used in a display/imaging device of the present invention.

FIG. 2 is a sectional view showing another embodiment of a semi-transparent mirror used in the display/imaging device of the present invention.

FIG. 3 is a configuration diagram of a display/imaging device according to the present invention.

FIG. 4 is a timing chart of display and image capture of the display/image capture device of the present invention.

FIG. 5 is a configuration diagram showing an example of a conventional display/imaging device.

FIG. 6 is a cross-sectional view of a semi-transparent mirror that is a combination of a plurality of micro semi-transparent mirrors proposed previously.

FIG. 7 is a configuration diagram of a display/imaging device in which a semi-transparent mirror is constructed by combining a plurality of previously proposed micro semi-transparent mirrors.

8 is a diagram for explaining reflection from the back surface of the semi-transparent mirror in FIG. 7. FIG.

[Explanation of symbols]

1 Display device 2 Imaging device 3 Semi-transparent mirror 4 Transparent substrate 5. Microscopic semi-transparent mirror 6. Anti-reflection layer 6A Light scattering layer 7 Control device 30 Semi-transparent mirror

Claims (2)

[Claims] 1. A display device, an imaging device, and a semi-transparent mirror including a large number of minute semi-transparent mirrors, wherein the semi-transparent mirror is installed in front of the display device, and a subject in front of the display device is reflected from the semi-transparent mirror. A display/imaging device that captures an image as an image using the imaging device installed around the display device, characterized in that an antireflection layer is formed on the back surface of the semi-transparent mirror. 2. A display device, an imaging device, and a semi-transparent mirror including a large number of minute semi-transparent mirrors, wherein the semi-transparent mirror is installed in front of the display device, and a subject in front of the display device is reflected from the semi-transparent mirror. A display/imaging device that captures an image as an image using the imaging device installed around the display device, characterized in that a light scattering layer is formed on the back surface of the semi-transparent mirror.