JPS59200221A - Multicolor liquid crystal display element - Google Patents

Abstract

PURPOSE:To prevent the generation of moire stripes of color by arranging color filter layers in each display picture element with a proper irregularity. CONSTITUTION:Three-color, R, G, and B color filter layers in a display element are arranged irregularly to prevent the generation of moire stripes. That is, a dot arrangement consisting of three longitudinal dots and two lateral dots which is indicated by a long and short dash alternating line in Fig. is used as a repeat unit (picture element), and the same arrangement pattern is repeated. In this case, since three or more dots of the same color are not arranged in oblique directions though two dots of the same color are arranged in oblique directions, the unnatural impression of a display picture is relaxed, and further, the generation of moire stripes is suppressed effectively. Repeat units of arrangement patterns are arranged as shown by Fig.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multicolor liquid crystal display element, and particularly to a multicolor liquid crystal display element in which color filter layers are arranged with some irregularity.

A multicolor liquid crystal display element is a device in which electrodes are formed on the opposing surfaces of a pair of facing substrates, at least one of the pair of substrates and electrodes is composed of a transparent substrate and a transparent electrode, and the required portions of the electrodes are formed. For example, R (red), G (green),
A color filter layer of multiple colors consisting of B (blue) is provided in a desired shape, and a liquid crystal is filled between the two substrates. M+-
No. 201987, Japanese Patent Application No. 58-59667, Japanese Patent Application No. 1987
Specific examples of the configuration are disclosed in specifications such as No. 8-42416.

Such multicolor liquid crystal display elements have applications in various display devices such as computer terminals, color televisions, color video monitors, and the like, and research and development thereof has been actively conducted in recent years.

Conventionally, display devices used for such purposes were mainly color CRTs, but since color CIITs are configured to scan a fluorescent surface with an electron beam, R constituting each pixel in
It was necessary to give a certain regularity to the dot arrangement of the three colors of G B .

However, the present inventors have discovered that when using a simple time schedule and driving method in a multicolor liquid crystal display element, by controlling the driving order of electrodes arranged in a matrix shape, the arbitrary transmission photometer at any pixel, by applying a voltage to the intersection of the scanning electrode and the signal electrode, the so-called pixel, which can drive the color filter layer of the
It is quite possible to control the reflected field, and when using thin film transistors as drive electrodes, the required electrodes can be connected in almost any order using various coding and decoding techniques. We focused on the fact that it is possible to drive.

The present invention was made based on such knowledge, and
The main object of the present invention is to provide a multicolor liquid crystal display element in which color filter layers forming pixels have some irregularity in their arrangement.

Further, like the multicolor liquid crystal display element according to the present invention, R, G
By imparting some irregularity to the color filter layer consisting of , B, etc., it is possible to substantially prevent color moiré fringes from occurring when displaying an image with a certain regularity such as a striped pattern. can do.

Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.

FIG. 1 shows the arrangement and ξ turns of the color filter layer disclosed in the aforementioned patent application by the applicant of the present application.

In this case, since color filter layers of the same color are arranged in a vertical line, for example, the same image may be colored red (R).
, ), green (al), and blue (B), there is a problem in that the display position of each color is shifted, giving an unnatural feeling to the viewer.

FIG. 2 shows an example of a putter 7 in which color filter layers of each RGB color are arranged in a staggered manner.Although the color filter layers of the same color are arranged diagonally, they are less noticeable than in the vertical direction. The unnaturalness is improved compared to that shown in FIG. Further, the color filter layers for each of these I'LOB colors may be formed on electrodes formed in a stripe shape, and may be formed at least at the intersections of these opposing electrodes. Therefore, generally, the electrodes face each other orthogonally, and the shape at the intersection is a square, but by changing the width of the vertical and horizontal electrodes, you can create any shape from a horizontally long rectangle to a vertically long rectangle. It is possible to set the shape.

In addition, in a multicolor liquid crystal display element using a thin transistor as a drive electrode, the shape of the color filter layer is as follows.
It does not necessarily have to be square, but can be rectangular, circular, hexagonal, or other polygonal, or more irregularly shaped, without interfering with the wiring between each element of the thin transistor. These color filter layers can be arranged in any order as long as the pixel density is not affected, and it is possible to form a color filter layer having a desired pixel density.

By the way, in a multicolor liquid crystal display element using a relatively regular arrangement of color filter layers as described above, when an image including a regular pattern such as a striped pattern is displayed,
Moiré fringes may occur, which may impair the quality of the displayed image.

These moiré fringes can also occur on TV/video monitors using a non-color crt'r, but as is well known, they are caused by two types of regularly arranged butter/ This is due to an interference phenomenon between (for example, the striped pattern image to be displayed and the arrangement pattern of the ROB three-color dots on the fluorescent surface).

Therefore, by irregularly arranging the RGB three color filter layers in the multicolor liquid crystal display element according to the present invention, it is possible to prevent the occurrence of moire fringes as described above. can.

An example thereof is shown in FIG. 6a.

In this case, as shown by the chain lines in the figure, the array of vertical and horizontal dots becomes a repeating unit (corresponding to a pixel), and the same array pattern is repeated. At this time, two dots of the same color may be lined up diagonally, but more dots of the same color are never lined up, so the unnaturalness of the displayed image as described above is alleviated. , the occurrence of moire fringes can be effectively suppressed.

FIG. 5b shows the repeating unit of the arrangement pattern in this case.

In this case, RG in the repeating unit of the array pattern
B It is desirable that the number of dots of each color is the same, and if the size of each dot is not uniform, the surface area of the dots of each color of RGB in the repeating unit of each array pattern is substantially equal. This is desirable.

FIG. 4a shows another embodiment of a multicolor liquid crystal display element according to the invention.

In this case, as shown by chain lines in the figure, the repeating unit (corresponding to a pixel) of the array pattern is a 6×6 matrix of dots of each color of RGB.

In general, the repeating degree unit of the sequence pattern is m
Although it can be constructed from n (m, n: integer) matrices, it is preferable that m x n be a multiple of 3, greater than or equal to 6.

FIG. 4b shows an example of the arrangement of repeating unit units of each turn in this case, and the arrangement pattern is different for each unit as shown in FIG. 4a. Of course, all the units may have the same arrangement pattern.

Normally, if the dot arrangement is regular, one driving method when displaying an image is simplified, so it is preferable to adjust the irregularity of the dot arrangement depending on the intended use. .

However, especially in the case of a configuration in which thin film transistors are used as electrodes, it is quite possible to make the dots of each RGB color random over the entire display screen.

Even in such a case, it is necessary to take care to prevent dots of the same color from becoming partially concentrated or regularly lined up by chance.

Next, a method for manufacturing a multicolor liquid crystal display element according to the present invention will be briefly explained, for example, in the case of the multicolor liquid crystal display element shown in FIG.

Among the manufacturing methods of this multicolor liquid crystal display element, the manufacturing process from forming electrodes on a substrate to forming a layer to be dyed on the electrodes is described in, for example, Japanese Patent Application No. 56-20198 filed by the applicant of the present application.
It can be formed in the same manner as disclosed in No. 7 specification.

Next, the layers to be dyed are dyed with predetermined dyes corresponding to R, Q, and H, but in order to prevent layers other than the required dyed layers from being dyed, only the required dyed layers are dyed. It is necessary to expose the layer to light and cover the other layers to be dyed with an anti-dyeing mask made of, for example, an oil-based positive resist.

Therefore, a mask plate (1) with diagonal lines in the non-transparent part (2) as shown in FIG. 1), for example,
After positioning the desired layer to be dyed through an oil-based positive resist so that it corresponds to the transparent part (3) of the mask plate (1), it is exposed and developed to expose only the desired layer to be dyed. The other layers to be dyed are covered with an anti-dyeing mask (made of the above-mentioned resist cured).

Thereafter, the exposed layer to be dyed is dyed with an appropriate dye so that it becomes a red color filter layer exhibiting the desired color density, and after dyeing is completed, the dye resisting mask is peeled off using a peeling solution.

Hereinafter, in the formation of color filter layers of the second color (green) and the sixth color (blue), a mask plate (1
) of the mask plate (1) by a predetermined acid shift in the direction intersecting the direction in which the first color color filter layer is lined up, and the light-transmitting part (3
) is positioned to correspond to the layer to be dyed in the next color.

Through this mask plate (1), the process of creating an anti-dye mask that exposes and develops the resist on the layer to be dyed, the process of dyeing the exposed layer to be dyed with a predetermined dye, and the process of peeling off the dye-resistant mask, By repeating the process for the second and sixth colors, green and blue color filter layers can be sequentially formed, and finally, a multicolor liquid crystal with a color filter layer arrangement and ξ-turn as shown in FIG. A display element can be created.

Even when forming a color filter layer with the arrangement and three turns as shown in Fig. 62 and Fig. 4a, as described above, a mask plate for forming a dye-resistant mask is prepared for each color, for example. It can be created using an automatic exposure drafting machine, etc., and is extremely easy to form.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing a conventional arrangement of color filter layer dots. FIG. 2 is a conceptual diagram showing the simplest change to the arrangement of color filter layer dots based on the present invention. FIG. 3a is a conceptual diagram showing a specific example in which irregularity is given to the arrangement of dots within one pixel. FIG. 3b is a conceptual diagram showing the repeating unit in FIG. 3a. FIG. 4a is a conceptual diagram showing another specific example in which irregularity is given to the arrangement of dots within one pixel. 4b is a conceptual diagram showing an example of the arrangement of the repeating units in FIG. 4a. 4 and 5 are examples of mask plates used when manufacturing the multicolor liquid crystal display element according to the present invention. FIG. R...Red color filter layer G Green color filter layer B...Blue color filter layer II II II II II,
- J

Claims (2)

[Claims] (1) Electrodes are formed on the opposing surfaces of a pair of substrates arranged opposite each other, and at least one of the pair of substrates and electrodes is
In a multicolor liquid crystal display element constituted by a transparent substrate and a transparent electrode, color filter layers of a plurality of colors are provided in a desired shape in a desired part of the electrode, and a liquid crystal is filled between the two substrates. , each display pixel is configured with the color filter layer of the plurality of colors, and the color filter layer in each display pixel is
A multicolor liquid crystal display element characterized by being arranged with moderate irregularity. (2) According to claim (1), in which all display pixels are constituted by repeating unit units each containing the same number of color filter layers of a plurality of colors in the same or different arrangement. The multicolor liquid crystal display element described above.