JPH039686A - Picture display device possible to be image picked-up - Google Patents

Abstract

PURPOSE:To cancel parallax mutually between speakers, to make a picture display device compact and to utilize auxiliary lighting, which is provided on the back of a panel for picture display, as a light source for lighting-up an object by photographing the object, which is faced to the picture display panel, through this picture display panel. CONSTITUTION:In the picture display part of a liquid crystal display panel 1, a picture received from an opposite party is displayed. At the time of photographing, the object such as the speaker, etc., facing to the liquid crystal display panel 1 is photoelectrically converted by a photodetector 4 through a half mirror 2 and a photographing lens 3 by switching the liquid crystal display panel 1 to a transparent state. Afterwards, the object is formed to be a picture signal and transmitted. Light from auxiliary lighting 5 is transmitted through the panel 1 and lights-up the object in front of the panel 1. Thus, the parallax mutually between the speakers is canceled, and since the photographing lens is provided in the back direction of the said panel, the device can be made compact when it is applied to a video telephone set. Then, even in a place where the quantity of light is not enough, speaking can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image display device used in a video telephone or the like.

[Prior Art] Videophones are conventionally known in which a telephone is equipped with an image display device such as a liquid crystal panel and an image reading device such as a camera so that images can be transmitted and received along with voice.

This videophone is generally equipped with a photographic lens near the image display device, and images objects such as the person or objects facing each other through the photographic lens, converts the image into an image signal, and transmits the image to the telephone line. The image signal transmitted through the telephone line and received through the telephone line is displayed on an image display device after being subjected to image processing.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional videophone, the photographing lens is provided in a different position from the image display device, which creates parallax between callers and makes the conversation unnatural. There was a drawback. Another disadvantage is that a space is required to provide the photographing lens near the image display device, which increases the size accordingly. Furthermore, conventional videophones have a problem in that when there is insufficient lighting in the room, the image of the subject to be transmitted becomes unclear.

The present invention was proposed in order to solve these problems, and it enables a subject facing an image display panel to be photographed through the image display panel, eliminates parallax between callers, and The purpose of this is to miniaturize the device and use auxiliary lighting provided on the back side of the image display panel as a light source for illuminating the subject.

Means for Solving Problem E] For the above-mentioned purpose, the present invention provides an image display panel that can be switched to a transparent state, in which an imaging means is provided behind the image display panel, and the image display panel is A switching means for switching between an image display state and a transparent state is provided, and when the image display panel is switched to the transparent state by the admiring means, the object is imaged by the imaging means through the image display panel. This is the first feature.

A second feature of the present invention is that auxiliary lighting is provided behind the image display panel, and when the image display panel is in a transparent state, the auxiliary lighting illuminates a subject in front of the image display panel. It is.

[Example] Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a schematic diagram of the present invention, and ▪ is a liquid crystal display panel for displaying received images. The entire image display section of this liquid crystal display panel 1 can be switched to a transparent state. Further, a half mirror 2 is disposed behind the liquid crystal display panel 1, and a photographing lens 3 and a light receiving element 4 such as a CCD are disposed behind the half mirror 2. Furthermore, auxiliary lighting 5 is provided above the half mirror 2 to make the liquid crystal panel more visible.

With such a configuration, the image received from the other party is displayed on the screen display section of the liquid crystal display panel 1. In addition, at the time of non-life insurance, by switching the liquid crystal display panel 1 to a transparent state, a subject such as a caller facing the liquid crystal display panel 1 is photoelectrically converted by the light receiving element 4 through the half mirror 2 and the photographing lens 3. It is converted into an image signal and transmitted.

Further, the light from the auxiliary illumination 5 is reflected by the half mirror 2 and illuminates the liquid crystal display panel 1 toward the rear side, and when the panel 1 is in a transparent state, the illumination light is transmitted through the panel 1. This will illuminate the subject in front of the panel. It goes without saying that when displaying the received image on the liquid crystal display panel 1, the auxiliary illumination 5 serves as auxiliary light for making the screen easier to see.

FIG. 2 is a system block diagram of a video telephone incorporating the present invention.

The communication control unit IO connected to the telephone line determines whether it is an image signal or an audio signal, and if an image signal is input,
After width-phase demodulation (in the case of image information based on the TTC standard) is performed in the demodulation circuit 11, the signal is held in the sample and hold circuit 13 by a signal from the timing signal generation circuit 12. Thereafter, it is converted into a digital signal by the A/D conversion circuit 14 and sent to the image control section 15. After image processing is performed by the image control unit 15, the D/A conversion circuit 16
The received image is converted into an analog signal by the LCD driver 17 and displayed on the liquid crystal display panel 1.

When the changeover switch connected to the central control section 27 is turned ON or OFF, this liquid crystal display panel l is connected to the LCD driver via the image control section 15 and the D/A conversion circuit 16 in response to a command from the central control section 27. 17, it is possible to switch between the received image display and the transparent state. Then, when the display panel 1 becomes transparent,
An object in front of the display panel is photographed from the back side using a lens 3, and the image is photoelectrically converted by a light receiving element (CCD) 4, then converted into a digital signal by an A/D conversion circuit, and sent to an image control section 15. The image is processed (22 is a driver that controls the CCD), and then the D/A conversion circuit 2
0 is converted into an analog signal, amplitude and phase modulated by the modulation circuit 21, and then transmitted from the communication control unit 10.

Transmission and reception of audio signals is performed by the receiver 25 via amplifier circuits 23 and 24.

The image control section 15 also performs writing to and reading from the image memory 26 based on commands from the central control section 27. In addition, the central control unit 27 controls the image processing unit 15, the timing signal generation circuit 12, and the LC in response to various switch operations provided in the videophone.
It controls the entire system including the D driver 17 and COD driver 22.

In the embodiment described above, the entire liquid crystal display panel 1 is switched to a transparent state, but in other embodiments, for example, as shown in FIG. (6 indicates image display pixels). The arrangement of the transparent portions may be arranged in any manner, but it is necessary to avoid parallax with the interlocutor displayed on the same panel 1. Configure.

Furthermore, although the above-described embodiments have been described with respect to a video telephone, the present invention can also be applied to an image display device such as an intercom.

In addition, it goes without saying that the configurations shown in FIGS. 1 to 3 can be modified as necessary in accordance with the gist of the present invention.

[Effects of the Invention] According to the present invention described above, the image display panel can be placed in a transparent state, and a subject such as a caller facing the image display panel can be photographed through the image display panel. Therefore, parallax between callers is eliminated. In addition, since the photographing lens is provided on the back side of the display panel, it can be made smaller compared to conventional lenses when applied to videophones. Since the lighting can be used as a light source for illuminating the subject, effects such as being able to talk on the phone even in places where the amount of light is insufficient can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the invention, FIG. 2 is a system block diagram also showing an embodiment of the invention, and FIG. 3 is a front schematic diagram of an image display panel. In the figure, 1 is an image display panel, 2 is a half mirror, 13 is a photographic lens, 4 is a light receiving element, 5 is an auxiliary illumination, 15 is an image control section, 17 is an LCD driver, 22 is a CCD driver, and 27 is a central control section. .

Claims (2)

[Claims] (1) An image display panel that can be switched to a transparent state, wherein an imaging means is provided behind the image display panel, and a switching means is provided for switching the image display panel between an image display state and a transparent state; When the image display panel is switched to a transparent state by the switching means,
An image display device capable of capturing an image, characterized in that the image display device is configured to capture an image of a subject through the image display panel with the image capturing means. (2) Auxiliary lighting is provided behind the image display panel, and when the image display panel is in a transparent state, the auxiliary lighting is configured to illuminate a subject in front of the image display panel. An image display device that can capture images.