JPH02269314A - Color dot matrix liquid crystal display device - Google Patents

Abstract

PURPOSE:To execute the observation as a desired color mixture display, and also, to recognize it visually from the oblique direction, as well by providing a light shielding wall on a diffusion plate arranged in front of a liquid crystal cell so as to reach the front from the rear face of the diffusion plate or to extend to this side of the front so that each picture element is divided and formed. CONSTITUTION:In front of a liquid crystal cell 12, a diffusion plate 14 is arranged, and on this diffusion plate 14, a light shielding wall 15 is provided like a lattice so that each picture element 11 of the liquid crystal cell 12 is divided and formed. The light shielding wall 15 is constituted by inserting a lattice-like light shielding member 16 into a groove 14a notched and recessed like a lattice in advance on the rear face of the diffusion plate 14, and fixing it, for instance, with an adhesive agent, etc. In this state, in the diffusion plate 14, light beams of three colors from each display dot 11r, 11g and 11b are diffused only in the part corresponding to the picture element 11 by the light shielding wall 15, mixed to a desired color being a display dot of the picture element 11, and a color display of the desired color can be executed. In such a way, the liquid crystal display device which is very easily even in the case of executing an observation from the oblique direction and has high visibility is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color dot matrix liquid crystal display device.

[Prior Art and Problems] Conventionally, a color dot matrix liquid crystal display device used for color televisions, color graphic displays, etc. is configured as shown in FIG. 5, for example. That is, in FIG. 5, a color dot matrix liquid crystal display device (hereinafter simply referred to as a liquid crystal display device) l has a large number of approximately square pixels 2 arranged in the vertical and horizontal directions.
The liquid crystal cell 3 includes a liquid crystal cell 3, a milky-white diffuser plate 4 disposed behind the liquid crystal cell 3, and a light source 5 that illuminates the diffuser plate 4 from behind. Each pixel 2 is R(
It is formed by horizontally arranging a set of three vertically long red dots 2r, green dots 2g, and blue dots 2b with color filters of red), G (green), and B (blue). , the set of dots 2r, 2g, 2
By controlling b appropriately and turning it on and off, each pixel 2
By illuminating the display dots as one display dot with light from the light source 5 through the diffuser plate 4, the display dots are made to emit light in arbitrary colors, thereby providing a multicolor display.

The liquid crystal display device l configured in this way has an arbitrary pixel 2.
In contrast, the dots 2r, 2g, 2b forming this pixel
By appropriately controlling and driving the pixel 2, this pixel 2 displays a desired color, and in the same way, for example, by time-division driving using an AC voltage, all pixels sequentially display a color tod. The display device l will display the desired color image as a whole.

However, the liquid crystal display device configured as described above
l is each pixel 2 of which each pixel 2 constitutes when viewed closely in its color display)2r.

2g and 2b can be separated and observed, so the pixel 2 as a whole does not display a mixed color display.Furthermore, due to the characteristics of the liquid crystal display device 1, the angle at which the display can be viewed is small, and it is difficult to see the display from an oblique direction. When observing the color display, the display becomes difficult to see and each dot 2r,
2g and 2b will interfere with each other.

[Object of the Invention] In view of the above points, the present invention provides a method in which, even when observing a color display from a close distance, each pixel is not separated into dots of each color constituting it, but is observed as a desired mixed color display. It is an object of the present invention to provide a color dot matrix liquid crystal display device that can be viewed even from an oblique direction.

[Means and actions for solving the problem] The above purpose is to
According to the present invention, the liquid crystal cell includes a plurality of pixels arranged in the vertical and horizontal directions, and each pixel is formed by a set of three display dots attached with three color filters. In a color dot matrix liquid crystal display device, a diffusion plate is disposed in front of the liquid crystal cell, and there is a diffuser plate that extends from the rear surface of the diffusion plate to the front surface or to the front surface of the diffusion plate so as to define each pixel. This is achieved by arranging a light shielding wall so as to extend.

In the color dot matrix liquid crystal display device according to the present invention, preferably, the light shielding wall provided on the diffuser plate is a light shielding member inserted and fixed into a groove provided in a lattice shape in the diffuser plate, or is integrally formed in the diffuser plate. It is provided by two-color molding and is composed of a lattice-shaped light shielding member.

According to this invention, three-color light from a set of three display dots forming each pixel illuminated from the rear is diffused and mixed within a diffuser plate corresponding to each pixel defined by a light-shielding wall. As a result, each pixel displays one mixed color, so even if you get close to a pixel displaying that color, you will not be able to see it separated into individual display dots. , a desired mixed color display can be performed as one color display dot for each pixel.

Furthermore, even when this color display is observed from an oblique direction, the light from each pixel is diffused by the diffuser plate placed in front of the liquid crystal cell.
An easy-to-read color display can be obtained without causing interference between adjacent display dots.

【Example〕

The present invention will be described below based on embodiments shown in the drawings.

In FIG. 1, an example of a color dot matrix liquid crystal display device according to the present invention is shown. This color dot matrix liquid crystal display device (hereinafter simply referred to as a liquid crystal display device) 10 includes a liquid crystal cell 12 including a large number of substantially square pixels 11 arranged in the vertical and horizontal directions, and a light source 13 that illuminates from behind the liquid crystal cell 12. It is composed of.

Each pixel 11 is R (red) and G (green).

It is formed by arranging three vertically long red dots (11g), green dots (11g), and blue dots (11b) in the horizontal direction as a set with a B (blue) color filter attached. A diffusion plate 14 is disposed on the front side of the liquid crystal cell 12, and as shown in FIG. A light shielding wall 15 is provided.

As shown in FIG. 3, this light-shielding wall 15 is constructed by inserting a grid-shaped light-shielding member 16 into a recess 14a that has been previously cut in a grid-like manner on the rear surface of the diffuser plate 14, and using adhesive or the like, for example. Alternatively, as shown in FIG. 4, it may be constructed by a grid-shaped light shielding member 17 integrally provided within the diffuser plate by two-color molding.

In addition, in FIG. 2, the light shielding wall 15 reaches the front surface of the diffuser plate 14, but in the case of FIGS. 3 and 4, the light shielding wall 15
does not reach the front surface of the diffuser plate 14, so that the light shielding wall 15 is not exposed on the surface of the liquid crystal display device 11.
The light shielding wall 15 becomes less noticeable.

Color dot matrix liquid crystal display device 1 according to the present invention
0 is configured as described above, and if we explain about an arbitrary pixel 11, the pixel 11 illuminated by the light source 13 has a set of display dots llr, l1g, l.
These three display dots llr and l1g are controlled on and off as appropriate so that lb exhibits a desired color display.
After passing through the liquid crystal cell 12, the light transmitted through the display dots llr, l1g, and llb enters the diffuser plate 14. Then, within the diffuser plate 14, the three-color light from each display dot llr, l1g, and llb is transmitted to the diffuser plate 14. Due to the light-shielding wall 15 provided within the pixel 14, the light is diffused only within the portion corresponding to the pixel 11, thereby mixing the desired color as the display dot of the pixel 11, and the pixel 11 as a whole becomes uniform. This results in color display of two desired colors.

Therefore, even when observing a color display from close to the liquid crystal display device 10, each pixel 11 is not observed separated into its constituent display dots llr, l1g, and llb (or from an oblique direction). Even when observing the color display, the display dots llr, l of each pixel 11 are emitted from the light source 13.
Since the light that has passed through 1g, llb and further passed through the diffusion plate 14 is diffused by the diffusion plate 14, it is also emitted in an oblique direction from the surface of the liquid crystal display device 10, so that the color display is High visibility (can be easily observed).

(Effects of the Invention) As described above, according to the present invention, each pixel is composed of a plurality of pixels arranged in the vertical and horizontal directions, and each pixel is attached with a three-color filter to form a set of three pixels. In a color dot matrix liquid crystal display device having a liquid crystal cell formed of display dots, a diffusion plate is disposed on the front side of the liquid crystal cell, and a plurality of pixels are arranged on the diffusion plate so as to define each pixel. A light-shielding member, which is provided with a light-shielding wall that extends from the rear surface of the diffuser plate to the front surface or extends to the front surface, and preferably inserts and fixes the light-shielding wall into a groove provided in a grid pattern in the diffuser plate; Since it is composed of a grid-like light-shielding member integrally provided within the diffuser plate by two-color molding, the three-color light from a set of three display dots forming each pixel illuminated from the rear is blocked. By being diffused and mixed in the diffuser plate corresponding to each pixel defined by the wall, each pixel displays a single mixed color, so even when observing from close to the pixel displaying that color, The desired mixed color display is performed as one color display dot for each pixel, rather than being able to be observed separately for each display dot.

Furthermore, even when the color display is observed from an oblique direction, the light from each pixel is diffused by the diffuser plate placed in front of the liquid crystal cell.
An easy-to-read color display can be obtained without causing interference between adjacent display dots.

Thus, according to the present invention, an excellent color dot matrix liquid crystal display device with extremely high display quality, which is very easy to see and has high visibility even when observed from close to the display and when observed from an oblique direction. can be provided.

[Brief explanation of drawings]

FIG. 1 is a partially enlarged front view showing one embodiment of a color dot matrix liquid crystal display device according to the present invention, and FIG.
3 is an exploded perspective view showing an example of forming a light shielding wall, and FIG. 4 is an exploded perspective view showing another example of forming a light shielding wall. FIG. 5 shows an example of a conventional color dot matrix liquid crystal display device, in which (A) is a partially enlarged front view and (B) is a cross-sectional view. 10... Color dot matrix liquid crystal display device; 1
1...Pixel, llr, l1g, llb...display dot; 12...liquid crystal cell; 13...light source; 1
4...Diffusion plate; 15...Shading wall, 16.17...
Light shielding member.

Claims (5)

[Claims] (1) A color dot matrix including a liquid crystal cell consisting of a plurality of pixels aligned in the vertical and horizontal directions, each pixel being formed by a set of three display dots with three color filters attached. A color dot matrix liquid crystal display device, characterized in that a diffusion plate is disposed in front of the liquid crystal cell, and a light shielding wall is provided on the diffusion plate so as to define each pixel. Device. (2) The color dot matrix liquid crystal display device according to claim 1, wherein the light shielding wall extends from the rear surface to the front surface of the diffuser plate. (3) Claim 1, wherein the light shielding wall extends from the rear surface of the diffuser plate to the front surface thereof.
The color dot matrix liquid crystal display device described in . (4) The light-shielding wall is constituted by a light-shielding member inserted and fixed in a groove provided in a lattice shape in the diffusion plate, The color dot matrix liquid crystal display device according to any one of the above. (5) Claims 1 to 3, characterized in that the light shielding wall is constituted by a lattice-shaped light shielding member integrally provided within the diffuser plate by two-color molding. The color dot matrix liquid crystal display device according to any one of the above.