JPS58107786A - Picture display image pickup device - Google Patents

Abstract

PURPOSE:To attain full color display at a display level having a high lightness, through transmission type display, by providing a white light source at the back of a display panel. CONSTITUTION:In bidirectional picture communication like a television telephone set, a video signal transmitted from a remote terminal is pictured on a display panel 6 consisting of an optical transmission element such as liquid crystal, PLZT and EC. To attain the display of transmission type effectively, white light sources 9 and concaved mirrors 10 are provided. Since the scanning element is converted from ON to OFF or OFF to ON at each scanning of the element, the display element is in transmission state periodically, a light from external parts passes through the display panel and is incident to an image pickup element 8 for an objective 5, to be picked up.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image display/imaging device that uses a transmissive display to increase the brightness and display effect to the extent that color display is possible.

Conventionally, videophone calls use CRT to display information.

It was of the type that took images using an image pickup tube.

In this case, if the user looks at the other person's eyes on the CRT, he or she cannot see the image pickup tube, which is located at a different location than the art dealer, so the users look at each other.

The device was inadequate for dialogue as it could not be adjusted properly.

FIGS. 1 and 2 are explanatory diagrams of the above-mentioned drawbacks. User (5
) directs the line of sight (4) or (3) to either the image pickup tube (2) or the display (2), which are located at different locations.If the user tries to look at the person shown on the display (1), For example, the line of sight is (3), and the image of the user reflected on the image pickup tube (2) is projected on the other party's display as shown in Figure 25.
As a result, users are unable to see each other.To overcome this drawback, a display panel is constructed using materials that transmit light such as liquid crystal, PLZT, EC, etc., and an image pickup tube, etc. is installed behind the display panel. A method was proposed in which an image pickup unit was provided. FIG. 3 is a sectional view illustrating the outline of this method. Display panel through which light is transmitted when ON or OF2 (
6), the image of the user (5) is focused on the imaging unit (8) by the lens system (7). The opponent's image is displayed on the display panel (
6).

Therefore, if the user looks directly at the panel showing the other person, the image will be taken by the imaging unit behind the user. With this method, users can see each other's gaze.

However, until now, only the reflective type of this method has been proposed, and its display performance has been low and has not reached a practical level.

The present invention provides an image display and imaging device that is capable of displaying images in full color at a high brightness display level using a transmissive structure.

The key point of the present invention is that a white light source is provided behind one display panel to display a transmissive display in order to reduce display brightness. Moreover, the light source and the imaging section are arranged in a position where the light from the white light source does not directly enter the imaging section. In addition, a solid-state image sensor is used to make the entire device compact.

The present invention will be explained in detail below with reference to the drawings.

FIG. 4 is a sectional view of one example of the image display device of the present invention.

(6) is a display panel using a light-transmitting display element. (8) is an imaging unit using a solid-state imaging device such as a CCD, BBD, or MOS. (7) is the outside world and the user (5)
This is a lens system that focuses the image of the image on the imaging unit. (9) has a transparent display. This is a white light source for use in

It is a concave mirror for 0υ is the frame of the device.

Oa is a non-reflection coating film that prevents the light from the light source from being reflected once and entering the imaging section. The white light source (9) is arranged in front of the imaging section so that its light does not directly enter the imaging section (8) and does not prevent the light from being irradiated onto the display panel. FIGS. 5 and 6 are explanatory diagrams showing the shape of the white light source and the positional relationship of the imaging section. In FIG. 5, the center is removed and the imaging section (8) is placed inside. FIG. 6 shows the position of the imaging section (8) when two cylindrical light sources are used.

The display sequentially scans the video signals sent from the other party and forms a υ image by turning on and off the display element. Also, the imaging is switched from ON to OFF or OFF every time one display element is scanned.
Converted from F to ON.

This is possible because light from the outside world passes through the display panel section and is incident on the image sensor when it enters the transmitting state.

The present invention enables brighter displays than ever before.
'Ta.

FIG. 7 is a sectional view of a display panel section that uses liquid crystal, particularly GH liquid crystal, to display full color. C13
, (1cJ, QQ is a transparent substrate such as glass!

(Between Li and Qlli is an area where GH liquid crystals containing pigments corresponding to the three subtractive primary colors correspond to each other.)
.

(1ηb, (enclosed in b5c).Between 01 and (1).

A GH liquid crystal (14) for controlling color brightness is sealed in the transparent substrates Ocj and 01, as shown in FIG. It is formed into units.3
The number of transistors in contact with the liquid crystal layer (1'i) responsible for the primary colors is three times the number of transistors in contact with the liquid crystal layer (1'i) responsible for the brightness of the two colors. In other words, the brightness of the colors made up of the three pixels that carry the three primary colors is achieved by one electrode with an area three times as large.3.A in Figure 8 is the switching for controlling the liquid crystal layer 01. The electrode configuration of the section is shown. OFj is Tr, and the α field is a transparent electrode due to Nesa. FIG. 8b shows the electrode structure of the switching section for controlling the liquid crystal layer αη. 0→ is a Tr and the wire is a transparent electrode. The pixel electrode of b in Fig. 8 is for each primary color 0.
ηa+0ηb, (controls 1ηC. Also.

Each transparent electrode is provided with a capacitor to maintain voltage application for a certain period of time.

A response of about 100 m8 is sufficient for display on videophones, etc., and it is also sufficient to use a liquid crystal.

A display panel with a faster response such as PLZT is even better. Furthermore, in the case of GH, a very clear contrast can be obtained by providing a polarizing plate on the white light source in order to improve the 2 display contrast.

FIG. 9 is an example of a videophone using the present invention. Q is the screen, (A) is the speaker, (C) is the microphone, and Q◆ is the operation unit.

As described above, by using the present invention, it is possible to obtain an interactive image device with a higher display performance than ever before, and its social significance is extremely significant.

[Brief explanation of the drawing]

FIGS. 1 and 2 are cross-sectional views and displayed images of an image display and imaging device using C1jT. FIG. 5 is a cross-sectional view of a conventional example. FIG. 4 is a cross-sectional view of the present invention. Fig. 7 is a cross-sectional view of a panel using the GH of the invention; Fig. 8 is a front view of the Tr section of the panel; Fig. 9 is an external view for use in television broadcasting (1):
CRT (2): Image pickup tube (5): User (6): Display panel (7): Lens system (8) Two solid-state image sensors (9): White light source (11: Concave mirror (13, (1!9. (IQ: transparent substrate (14, (1
71: GH Liquid Crystal Patent Applicant Tanigaki Suzu Daisai Figure 1 Sai L Mouth Figure 3 Off F Figure 3 - Country Q & Off Q 13
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Claims (1)

[Claims] In an interactive image device such as a videophone having both display and imaging functions, one display section uses a light-transmissive display element such as a liquid crystal, PLZT, or EC, and a white light source is provided behind the display element. A CCD is provided and configured as a light transmissive type, and is located behind the two display elements and at a position where the light from the white light source is avoided.
An image display and imaging device 6゜ characterized by having an imaging section configured by arranging solid-state imaging devices such as , BBD, MOS, etc.