JPH0277785A - Color liquid crystal display - Google Patents

Abstract

PURPOSE:To obtain natural excellent display quality without making the outermost side conspicuous in half-tone display mode when horizontal picture element which are integral times as many as the primary colors are arrayed by covering picture elements of red or green arrayed at the leftmost end part or rightmost end part of the screen of a color liquid crystal display picture element array structure with a black or metallic film. CONSTITUTION:Red, blue, and green as the primary colors of the color liquid crystal display are arrayed and the screen consists of 1st - (M-1)th picture element rows 1a - 1b and a (m)th picture element row 1c in the delta shape. Picture elements which constitute those picture element rows are arrayed in a matrix and color filters (coloring means) corresponding to the respective picture elements are arranged. Those color filters are provided on the external or internal surface of a color filter substrate 2 above or below signal electrodes, scanning electrodes, picture element electrodes or a common electrode. Then the leftmost end part of the picture elements constituting the respective picture element rows is red and the rightmost end part is green; and the leftmost or right most end part 3 or 4 of the (m)th picture element row 1c is covered with the black or metallic film.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention relates to a pixel arrangement structure in a color liquid crystal display, and more specifically to a color filter used in a liquid crystal color television set for driving a thin film transistor (TPT) active matrix. It is related to the pixel array structure.

<Prior Art> FIG. 3 shows a delta array structure of a typical conventional color filter used in a color liquid crystal display. This delta method arrangement is because the three primary colors red, green, and blue are arranged in a delta shape, and by color mixing and gradation display of each picture element, full color can be displayed, and the three primary colors are arranged in a delta shape. A natural screen can be formed.

Generally, in a TPT active matrix drive color liquid crystal display, one pixel is driven by a driver IC.
Turning on or off the picture elements is selected by driving the TPT installed in each one, but the number of picture elements in the horizontal direction of the screen is basically an integral multiple of the three primary colors of red, green, and blue. configured. In other words, as shown in Figure 3, if the left edge starts with blue, then green and then red are arranged horizontally, the rightmost pixel color will end with red, and the leftmost edge of the entire screen will be blue. , the rightmost end is red. There is a brightness standard called Y visibility as a measure of the brightness of transmitted light such as the picture elements of a color filter.

Figure 2 shows the Y visibility of the three primary colors red, green, and blue; the higher the Y visibility, the brighter it feels to the human eye, and the lower the Y visibility, the darker it feels. That is, among the three primary colors, green is the brightest and most noticeable, while blue is the darkest and least noticeable.

<Problems to be solved by the invention> However, as mentioned above, the horizontal pixel arrangement is blue, green,
In a color liquid crystal display using a color filter in which the number of picture elements is an integral multiple of this number in the order of red,
When the screen display is an intermediate display such as gray, the red pixel at the far right of the screen has no pixels to mix colors and has high Y visibility, so it stands out as a row of red pixels on the right side, and the screen display becomes It becomes unnatural.

Also, in the case of a color filter in which the horizontal pixel arrangement is in the order of blue, red, and green, and the number of pixels is an integral multiple of this order, the Y visibility of the rightmost green is high, so it is treated as a green pixel array. It may be noticeable. Furthermore, when the horizontal pixel arrangement is in the order of red, blue, and green, red at the leftmost end and green at the rightmost end are similarly conspicuous.

The present invention provides a TPT active matrix drive color liquid crystal display module that provides a natural display in which the color of the picture elements at the outermost edge of the screen is not noticeable even when the screen display is a gray display or other halftone display where display unevenness is easily recognized. One of the objects of the present invention is to provide a pixel arrangement structure of a color filter. The corresponding coloring means are arranged in such a way that the above-mentioned three primary colors are arranged horizontally in a straight line at a constant period so that the picture element rows are vertically parallel and the three primary colors are adjacent to each other in a delta shape, and by color mixing and gradation display of each picture element. In a color liquid crystal display that displays full color, the leftmost red pixel and the rightmost green pixel among the pixels in each row of picture elements are partially covered with black or a metal film. It is a color liquid crystal display.

That is, in the present invention, when the color of the leftmost or rightmost pixel in each pixel row is red or green, the pixel area is made smaller than that of blue by covering it with a black or metal film, making it more visible to the human eye. The Y visibility, which is a standard for perceived brightness, is configured to be small.

<Function> When the leftmost and rightmost pixels of each pixel row, which consists of pixels corresponding to the three primary colors of red, blue, and edge, and the corresponding coloring means, are red but still green, some parts are black. Even in half-tone displays such as gray displays, where display unevenness is most easily recognized because the pixels are covered with a metal film, coloring can be prevented if only the outermost pixel rows stand out on the screen as a whole.

<Examples> The present invention will be described in detail below based on examples shown in the drawings. Note that this invention is not limited by this.

FIG. 1 shows a pixel arrangement of a color filter in a TPT active matrix driven color liquid crystal display showing one embodiment of the present invention.

In FIG. 1, the three primary colors red, blue, and green are arranged on the screen, and the three primary colors are arranged in a delta shape. That is, the screen is divided into the first picture element row 1a to the (m-1)th picture element row 1.
It consists of a b-th and m-th pixel row 1c, and the pixels constituting each pixel row are arranged in a matrix, and a color filter (coloring means) is arranged corresponding to each pixel. This color filter is made of gelatin material, and is provided on the outer or inner surface of the color filter substrate 2, or provided above or below the signal electrode, scanning electrode, picture element electrode, or common electrode.

In the delta array color filter, among the picture elements constituting each picture element row, the leftmost picture element is arranged in red, and the rightmost picture element is arranged in green. The leftmost end 3 and rightmost end 4 of this m-th pixel row 1c are designated 3a and 4a, and 3b and 4a are covered with a black or metal film.

<Effects of the Invention> According to the present invention, in the pixel arrangement structure of a color liquid crystal display, a red or green pixel arranged at the leftmost or rightmost end of the screen is covered with a black strip or a metal film. As a result, when the number of pixels in the horizontal direction is an integer multiple of the three primary colors, the coloring phenomenon at the outermost edge, which has been a problem, is reduced to the outermost edge even in halftone display such as gray display, where display unevenness is most easily recognized. It is possible to obtain a natural and good display quality without making the display stand out.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the configuration of an embodiment of the present invention, FIG. 2 is a Y visibility characteristic diagram of three primary colors, and FIG. 3 is a diagram illustrating the configuration of a pixel array structure showing a conventional example. 1as Ib, ]c... picture element row, 2 - color filter substrate, 3... picture element at the leftmost end, 3a picture element constituting the present invention, 4... picture element at the rightmost end, 4a... book Invention composition picture element.

Claims (1)

[Claims] 1. The picture elements corresponding to the three primary colors of red, green, and blue and the coloring means corresponding thereto are arranged so that the three primary colors are arranged horizontally in a straight line with a constant period, and the rows of picture elements are arranged in parallel and the three primary colors are adjacent in a delta shape. In a color liquid crystal display that displays full color on the screen by color mixing and gradation display of each picture element, when the leftmost picture element or the rightmost picture element of each picture element row is red or green. A color liquid crystal display characterized in that red or green pixels are partially covered with a black or metal film.