JP2648168B2 - TV camera coaxial screen display - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a screen display mainly used for a small-screen videophone.

(Prior Art) Currently, in commercial videophones, when talking to the other party, the user is facing the small screen display, and does not look at the direction of the remote TV camera. General. For this reason, there is a sense of incongruity that the user and the partner are performed in a state where their eyes do not match.

In order to eliminate such discomfort, there is, for example, a television camera coaxial screen display having the configuration shown in FIG. this is,
The half mirror 2 is set on the optical center axis 4 of the small screen display 3 via the protective glass 1, while the reflected light axis 11 and the image input center axis of the television camera 6 are perpendicular to the optical center axis. In some cases, the television camera 6 is set via the lens 5 so that the line of sight coincides with the line of sight, and the line of sight of the television camera 6 is matched via the half mirror.

However, according to this configuration, the image light rays emitted from the small screen display 3 cause irregular reflection by the half mirror 2, the protective glass 1, etc., and are captured by the television camera 6, so that the image signal itself is not very sharp. Further, there is a disadvantage that the television camera appears thin to the user via the half mirror 5.

(Object of the Invention) The present invention clarifies a video signal from a television camera,
It is an object of the present invention to make the user unaware of the television camera and to match the angle between the user and the line of sight of the other party.

(Constitution of the Invention) (Differences between the features of the invention and the prior art) In order to achieve the above object, the present invention provides a liquid crystal shutter provided on each of a screen display side and a television camera side by using a vertical synchronization signal of a television camera signal. The most important feature is to open and close alternately in synchronization with.

The prior art differs from the one in which a television camera is arranged in a right angle direction via a half mirror simply arranged on the optical center axis of the screen display.

(Embodiment) FIG. 1 shows a configuration diagram of an embodiment of the present invention. As shown in FIG. 1, a half mirror 2 is provided on the user (person) side, and a first liquid crystal shutter is provided on the small screen display 3 side. 7 is provided, and a second liquid crystal shutter 8 is provided in front of the lens 5 between the television camera 6 and the half mirror 2.

And, these two liquid crystal shutters 7 and 8
As shown in the opening / closing operation timing chart, the first and second liquid crystal shutters 7 and 8 are kept constant as shown in FIGS. 2 (2) and (3) in synchronization with the vertical synchronization signal (1) of the television signal. Open and close alternately at the timing of.

In order to operate this, the vertical scanning period {FIG. 2 (1)}
(A) The first liquid crystal shutter 7 is opened to allow the light from the small screen display 3 to go in the direction 9 so that the user can see the image from the small screen display 3. Further, at that time, the second liquid crystal shutter 8 is closed, so that the light irregularly reflected by the protective glass 1 and the half mirror 2 does not go to the lens 5 and the television camera 6 to sharpen the image.

Next, the vertical blanking period {(B) in FIG.
The liquid crystal shutter 7 is closed, the second liquid crystal shutter 8 is opened, the light in the direction 10 is efficiently reflected by the half mirror 2, and the video signal is taken out toward the lens 5 and the television camera 6. Since the image is displayed during the vertical retrace period, the television camera is hard to see from the outside. That is,
Prevented users from being aware of TV cameras.

(Effects of the Invention) As described above, the present invention controls the light by opening and closing the two liquid crystal shutters alternately in synchronization with the vertical synchronization signal of the television signal, thereby controlling the light emitted from the screen display. Since the irregular reflection of light is prevented, the video signal becomes clear. In addition, since the video camera cannot be viewed from the outside, the user can use the videophone without being conscious of the video camera. Furthermore, since the configuration is coaxial, there is an advantage that the user can see the other party's line of sight and can make a videophone without any discomfort.

[Brief description of the drawings]

FIG. 1 is a configuration diagram according to one embodiment of the present invention, FIG. 2 is a timing chart of opening and closing operations of a liquid crystal shutter, and FIG. 3 is a configuration example diagram of a conventional television camera coaxial screen display. 1 ... protective glass, 2 ... half mirror, 3 ... small screen display, 4 ... optical center axis, 5 ... lens, 6 ...
... TV camera, 7 ... First liquid crystal shutter, 8 ...
Second liquid crystal shutter, 9,10 ... light direction, 11 ... reflection optical axis.

Claims (1)

(57) [Claims] 1. A television having a half mirror on a person side and a first liquid crystal shutter on a screen display surface side on an optical center axis connecting a position of a person's eyes and a screen display surface when the display is viewed from the front. A coaxial screen display for a television camera, wherein a second liquid crystal shutter is provided between a camera and the half mirror, and the two liquid crystal shutters are alternately opened and closed in synchronization with a vertical synchronization signal of a television signal. .