JP2522774B2 - Liquid crystal color display device - Google Patents

Description

The present invention relates to an image display device, and more particularly to a liquid crystal color display device.

[Conventional technology]

In a conventional liquid crystal color display device, R, G, and B color filters are provided on the liquid crystal cell array to display an image by a transmission method, so the resolution drops to 1/3 of the number of liquid crystal pixels. Since the liquid crystal cell array is passive, there is a drawback that an external light source for illuminating the liquid crystal cell array is required.

In addition, since the liquid crystal cell array itself needs to provide halftone, there is a problem that the drive circuit provided for each liquid crystal cell is complicated in order to change the light transmittance of these liquid crystal cells according to the halftone. It was

[Problems to be solved by the invention]

Therefore, an object of the present invention is to solve the above problems and provide a liquid crystal color display device capable of obtaining a high resolution with a simple circuit configuration.

[Means for solving problems]

To achieve such an object, the present invention guides an optical signal for a plurality of colors modulated by an image signal to one optical fiber and spatially mixes the color in the optical fiber,
Two-dimensionally diffuse the spatially mixed light signal,
The diffused optical signal is made incident on a liquid crystal shutter, and the optical signal is output via a light transmitting portion obtained by two-dimensionally scanning the liquid crystal shutter.

[Work]

In the present invention, since the optical signals of a plurality of colors modulated by the video signal are spatially mixed, the light transmitting portion formed by the liquid crystal shutter that performs self-scanning is synchronized with the spatially mixed optical signal. Since an image is displayed by outputting such an optical signal from the light transmitting portion while moving, the number of connections between the liquid crystal element and the external circuit is reduced, and the manufacturing cost can be significantly reduced. Moreover, it is possible to easily enlarge the screen, and since the pixels of each color are not arranged on the display surface, there is no obstruction that the filter arrangement can be seen even when the display surface is viewed close to it.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail and specifically with reference to the drawings.

 FIG. 1 shows the configuration of an embodiment of the present invention.

In Fig. 1, R, G, B video signals (TV signals) are respectively
It is electro-optically converted by R, G and B light emitting diodes. The optical two-dimensional signals obtained by the electro-optical conversion are spatially mixed in the optical fiber 1 and sent to the optical waveguide 2, and the optical signals are two-dimensionally transmitted by the Fresnel mirror 2-1 as shown in FIGS. 2 and 3. And is incident on the diffusion plate 2-2. The incident optical signal is further diffused by the diffusion plate 2-2, and the liquid crystal self-scanning scanner 3 constituting the display panel is illuminated from the back surface.

On the other hand, in the liquid crystal self-scanning display panel 3, the minute transparent window (light transmitting portion) 4 scans in the x and y directions in synchronization with the clock. In order to adapt this scanning timing to the TV signal, the x direction is the main scanning and the y direction is the sub scanning in FIG. FIG. 4 shows an example of the circuit configuration of the display panel 3 according to the embodiment of the present invention.

The display panel 3 is composed of a liquid crystal shutter 3-1 made up of N horizontal liquid crystals and M vertical liquid crystals. In case of NTSC, M =
488 (N and M are predetermined integers). Terminals 71 to 7M are pixel information
Data input terminals, CLK-1 and CLK-2 are clock input terminals. Referring to FIG. 4, a signal “H” is applied to the terminal 71.
When (pulse generation) is input and the clock signal line CLK-1 is set to "H", pixel information is input and the liquid crystal 41 (1) is turned on (transparent). Next, when the clock signal line CLK-2 is set to "H", the liquid crystal 41 (1) is turned off (opaque) and the liquid crystal 42
(1) is turned on, and the transparent window 4 shifts one by one to the right each time the clock is input. FIG. 5 shows the drive timing in the case of interlace.

In FIG. 5, the window scans 1,3 ... Rows in the first field and 2,4 ... Rows in the second field. Pulse 22H
Since the video signal starts from, the terminal 71 is set to "H" at this timing and the first row of the scanner 3 is scanned by the clock signal lines CLK1 and CLK2. In the second field, the second row of the scanner 3 is similarly scanned from the pulse 285H. In this way, the video signal can be set at a predetermined position in the two-dimensional space, and the video can be displayed.

〔The invention's effect〕

As described above, according to the present invention, by displaying a two-dimensional image in color using a self-scanning liquid crystal element, the number of liquid crystal pixels and the number of video pixels become equal, and the resolution is several times higher than that of the conventional one. Has come to be obtained. Further, it is not necessary to give the liquid crystal gradation, and the liquid crystal may be binary, and the driving circuit thereof can be greatly simplified, which facilitates the manufacture. Further, the interference by the conventional color filter array is eliminated, and the active operation is performed, so that the effect of improving the image quality can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of the constitution of the embodiment of the present invention, FIGS. 2 and 3 are explanatory views of the embodiment of the present invention, and FIG. 4 is an example of the constitution of a liquid crystal self-scanning scanner in the embodiment of the present invention. FIG. 5 is a timing chart showing an example of drive timing of the liquid crystal shutter 4 in the embodiment of the present invention.

Claims (1)

(57) [Claims] 1. An optical signal for a plurality of colors modulated by an image signal is guided to one optical fiber, spatially mixed in the optical fiber, and the spatially mixed optical signal is divided into two.
The optical signal is diffused two-dimensionally, the diffused optical signal is made incident on the liquid crystal shutter, and the optical signal is output through a light transmitting portion obtained by two-dimensionally scanning the liquid crystal shutter. Characteristic liquid crystal color display device.