JPH01259397A - Color liquid crystal display - Google Patents

Abstract

PURPOSE:To improve the reproducibility of a mixed color, and also, to make its color the same when an image has been viewed from each direction by forming a shape of each hole of a shadow mask so that an interval to a hole of a shadow mask being adjacent to each other becomes equal, respectively. CONSTITUTION:In a shadow mask 20, many holes being a regular hexagon, respectively are arranged, and when the horizontal direction is one train, 1/2 each of picture element is shifted at every one train. Also, a hole of each regular hexagon is formed so as to come into contact with each other by length (e), therefore, when one picture element is divided into two equal parts by segments b-b', c-c' and d-d' in each direction, one picture element is divided into two equal parts so as to be symmetrical to each other. On the other hand, a picture element electrode 21 is formed in a regular hexagon, and placed in a position opposed to the hole of each regular hexagon of the mask 20. Accordingly, each hole of the regular hexagon formed in the mask 20 comes into contact equally with all adjacent holes by length (e), respectively, and also, becomes symmetrical against the segments b-b', c-c' and d-d'. As a result, the reproducibility of a mixed color of red, green and blue is satisfactory, and as for the image which has been reproduced, the same image can be viewed in the same color, when it has been viewed from each direction.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to improvements in color liquid crystal displays.

(Prior Art) FIG. 7 is a configuration diagram of a color liquid crystal display, and this display includes a polarizing plate 1, a counter substrate 2, a color filter layer 3 consisting of red, green, and blue colors, and a counter electrode 4.
and T P T (thin f
ilm transistor) A substrate side consisting of an array substrate 5 and a polarizing plate 6 is placed opposite to each other, a liquid crystal 7 is filled between these electrode sides and the substrate side, and a diffusion plate 8 is further placed behind the polarizing plate 6. At the same time, a backlight 9 is arranged.

Further, the TFT array substrate 5 has a large number of pixel electrodes 10 arranged vertically and horizontally, and each of these pixel electrodes 10 has a TFTl.
1, and a signal line 1 is provided for each of these TFTs 1.
2 and scanning lines 13 are wired. However, with such a configuration, the signal line 12 and the scanning line 1
3 is selected and a voltage is applied, and the T
When FTll turns on, the pixel electrode 1 at that point
A voltage is applied between the electrode 0 and the counter electrode 4, and the amount of light transmitted changes due to the action of the liquid crystal during this time. As a result, if the pixel electrode 10 corresponds to a red color, for example, the light passes through the red color filter 3, so that red light is emitted.

By the way, the counter electrode 4 on the electrode side forms a so-called shadow mask, in which a large number of regular quadrilateral holes are formed, as shown in FIG. When the array of these regular quadrilateral holes is viewed as one row in the horizontal direction, the formation positions of the holes are shifted every other row. Note that FIG. 9 shows the arrangement relationship between the counter electrode 4 and the pixel electrode 10, and the counter electrode 4 and the pixel electrode 10 are arranged in a corresponding state.

However, there is a problem in that the use of such a shadow mask 4 deteriorates the quality of the mixed color of red, green, and blue. That is, when the minimum unit of luminescent color formed from each red, green, and blue pixel is called a picture element, FIG. 10 shows one picture element. Therefore, the entire color liquid crystal display is formed by arranging a large number of these one picture elements. Therefore, if we form a picture element like this,
The length of contact between adjacent pixels, for example green and blue pixels, is al, but the length of contact between red and green and red and blue pixels is a2, respectively. Also, line segment b-b
When divided into two equal parts by =, this line segment becomes symmetrical with respect to the center line S-b', but line segments c-c'' and d-d from different directions
If it is divided into two equal parts by -, it will no longer be symmetrical about the line segments C-C' and dd- as the center lines. Therefore, especially when emitting a mixed color of each color, that is, an intermediate color, the colors are not mixed uniformly and the color reproducibility deteriorates.Furthermore, when viewing the image on a color LCD display from each direction, the colors are different from each other. The reproducibility is poor, and the colors of the image appear different when viewed from each direction.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a color liquid crystal display that improves the reproducibility of mixed colors and allows images to be viewed in the same color from all directions.

This invention uses a shadow mask and a large number of pixels! In a color liquid crystal display constructed by arranging ffl facing each other and filling liquid crystal between these shadow masks and pixel electrodes, at least the shape of the hole in the shadow mask is determined by the distance between each hole in the adjacent shadow mask. This is a color liquid crystal display that attempts to achieve the above object by forming the display so that the color is uniform.

(Function) By providing such a means, the distances between adjacent shadow mask holes or pixel electrodes are equalized, and as a result, the mixed color of each color becomes uniform, and the image can be viewed from each direction. Even if they are the same color.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of a counter electrode, that is, a shadow mask 20 applied to a color liquid crystal display.

This shadow mask 20 has a large number of regular hexagonal holes arranged, and when the horizontal direction is one row, each row is shifted by half of each pixel. There is. To explain specifically the structure of one pixel of the shadow mask 20, as shown in FIG. 2, adjacent regular hexagonal holes are formed so as to be in contact with each other with a length e. Therefore, when one picture element is divided into two equal parts by line segments bb-1C-C- and dd- in each direction, one picture element is symmetrically divided into two equal parts. On the other hand, the pixel electrode 21 is formed in a regular hexagonal shape as shown in FIG. 3, and is disposed at a position facing each regular hexagonal hole of the shadow mask 20. Note that the pixel electrode 2
1 is provided with TFTl 1, so this TFT
A portion 20a of the shadow mask 20 corresponding to the portion where l1 is provided is formed into a plate shape. Thus, a color liquid crystal display is assembled using the shadow mask 20 configured as described above and the TFT array substrate having a large number of pixel electrodes 21 formed in regular hexagons.

Therefore, in a color liquid crystal display having such a configuration, the regular hexagonal matching holes formed in the shadow mask 20 are in equal contact with all adjacent matching holes with a length e, and each line min b-b-1c-c- and d
It is symmetrical with respect to -d-. Therefore, the reproducibility of the mixed color of red, green, and blue is improved. Furthermore, even if the reproduced image is viewed from various directions, the same image can be viewed in the same color without the colors appearing different in each direction.

Note that the present invention is not limited to the above-mentioned embodiment, and may be modified without departing from the spirit thereof. For example, in the above embodiment, the matching holes formed in the shadow mask 20 are regular hexagonal, but instead of being regular hexagonal, each corner portion 22 is curved as shown in FIG. 4, as shown in FIG. 5(a). Alternatively, each corner of a regular hexagon may be chipped, as shown in FIG. 3(b). Further, although both the matching holes of the shadow mask 20 and the pixel electrodes 21 are formed in a regular hexagonal shape, only the pixels may be formed in a regular hexagonal shape, or only the matching holes in the shadow mask 20 may be formed in a regular hexagonal shape. . Furthermore, the alignment hole of the shadow mask 20 or the pixel electrode 2
The shape of No. 1 is not a regular hexagon, but at least the shape of the matching hole of the shadow mask may be formed into a circle or an ellipse as shown in FIG.

[Advantageous Effects of the Invention 1] As described in detail above, according to the present invention, it is possible to provide a color liquid crystal display that improves the reproducibility of mixed colors and allows images to be viewed in the same color from all directions.

[Brief explanation of the drawing]

1 to 3 are diagrams for explaining one embodiment of a color liquid crystal display according to the present invention, in which FIG. 1 is an external view of a shadow mask, and FIG. 2 is a concrete configuration of the shadow mask. 3 is a diagram showing the arrangement relationship between a shadow mask and a pixel electrode, FIGS. 4 to 6 are diagrams showing modifications of the display of the present invention, FIG. 7 is a configuration diagram of a color liquid crystal display, and FIG. Figures 1 through 10 are diagrams for explaining the prior art. 20... Shadow mask, 21... Pixel electrode. 1゜Figure 2Figure 4Figure 5

Claims (1)

[Claims] In a color liquid crystal display configured by arranging a shadow mask and a large number of pixel electrodes facing each other and filling liquid crystal between the shadow mask and the pixel electrodes, at least the shapes of the holes of the shadow mask are arranged adjacent to each other. A color liquid crystal display characterized in that a shadow mask is formed so that the distance between the holes and the holes is equal.