JPH0154718B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liquid crystal display device, and particularly to a multicolor liquid crystal display device that displays a color image with a plurality of tones.

[Conventional technology]

Regarding the multicolor liquid crystal display element as mentioned above,
Patent Application No. 56-201987 (Showa
It is disclosed in the specification of a patent application filed on December 14, 1956, with the title of the invention "Method for manufacturing a multicolor image display device."

That is, as shown in FIGS. 1 and 2, a pair of substrates 21 and 21 are arranged parallel to each other, and an electrode 22 and a large number of fine color display electrodes 22 are formed on the opposing surfaces, respectively. In the color display electrode 22,
A color filter layer 23 consisting of the three primary colors of light, red (R), green (G), and blue (B) is sequentially formed, and a liquid crystal 24 is injected into the gap between the pair of parallel substrates 21, 21. At the same time, its peripheral edge is sealed with a sealing material 25 that also functions as a spacer.

Thus, the multicolor image display unit consists of a large number of minute regions 31 corresponding to the pixels of the original image, and each minute region 31 has three colors of red (R), green (G), and blue (B). It has a color filter layer 23.

In the multicolor liquid crystal display element configured in this way, when a predetermined voltage is applied between each color display electrode 22 on which the color filter layer 23 is formed and the electrode 22 facing it with the liquid crystal 24 interposed therebetween, The amount of transmitted light or reflected light of the liquid crystal 24 is controlled, and a multicolor image is displayed on the substrate 21.

[Problem that the invention seeks to solve]

In the multicolor display means, as shown in the first diagram, the unit pixel area is divided according to the number of display colors, so the display position of the image moves depending on the display color.
This will result in "color misalignment".

In FIG. 3, the unit pixel area 1 is divided into three parts, color display electrodes 2, 3, and 4 are arranged in each part, and each display electrode 2, 3, and 4 has a red filter layer (R),
FIG. 2 is a schematic diagram of a three-color liquid crystal display element in which a green filter layer (G) and a blue filter (B) are formed.

Assuming that the width of each color display electrode 2, 3, 4 is "a", and the mutual interval between color display electrodes 2, 3, 4 is "b", when displaying in red and when displaying in green,
Further, a shift in the position of "a+b" occurs in both the case of displaying in green and the case of displaying in blue.
Further, a positional shift of "2(a+b)" occurs between displaying in red and displaying in blue.

Assuming that the size of one unit pixel is, for example, 1 mm square, if the image is divided into three parts, the same part of the image will be about 0.3 mm or about 0.7 mm, depending on the color.
The image will be displayed shifted by mm, and the image quality will deteriorate significantly.

In order to eliminate this drawback, it is necessary to keep the color shift to a small amount that does not cause any visual discomfort.
The size of the unit pixel may be reduced. However, this increases the number of pixels, which increases the number of connection terminals to the drive circuit, making manufacturing difficult and costly, and the increased number of connection parts may reduce reliability. .

The specification of Japanese Patent Application No. 58-072279 (filed on April 26, 1988, title of the invention is "Multicolor Liquid Crystal Display Element") by the present applicant states that the display electrodes for each color are comb-shaped;
A configuration is disclosed in which these are arranged alternately within a unit pixel.

According to this, the above-mentioned color misregistration can be considerably eliminated. However, when trying to display three colors, the terminals of the color display electrodes partially overlap, so
An insulating layer must be interposed in the same area to avoid short circuits between the terminals.

SUMMARY OF THE INVENTION An object of the present invention is to improve such problems and provide a multicolor liquid crystal display element capable of displaying higher quality images while maintaining the size of a unit pixel at the same level as conventional ones. It is.

[Means for solving problems]

According to the present invention, a color filter of one of the three colors red (R), green (G), and blue (B) is placed on the surface of the liquid crystal side of the two legs protruding in parallel with a constant width. A pair of color display electrode groups is formed by arranging a large number of bifurcated fork-shaped color display electrodes having layers so that adjacent colors are different, and each leg of this pair of color display electrode groups is are arranged facing each other at equal intervals, and in order to arrange the three filter colors in a regulated manner, between the legs of one of the color display electrodes in one color display electrode group, the other color is placed between the legs of one of the color display electrodes. This is achieved by inserting two adjacent legs of the color display electrodes in the display electrode group.

〔Example〕

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

FIG. 4 is a schematic diagram showing an embodiment in which the present invention is applied to a three-color display liquid crystal element.

Two leg pieces of a certain width are made to protrude in parallel at an interval of at least twice the width of the leg pieces, and "R", "G", and "B" are marked on the surface of these leg pieces on the liquid crystal side, respectively. ”
A large number of three types of bifurcated fork-shaped color display electrodes 5, 6, 7 on which three color filter layers are formed,
They are arranged in parallel in that order to form one color display electrode group. Furthermore, a large number of similar color display electrodes 5, 6, and 7 are arranged opposite to each other in the same plane with their lateral positions shifted by one and a half to form another color display electrode group.

Between the two legs of each color display electrode 5, 6, 7 in the color display electrode group in one row, one of the two different color display electrodes 6, 7, 5 in the color display electrode group in the opposite row A leg piece is stuck in.

FIG. 5 is a schematic diagram showing an enlarged unit pixel 1 in a case where the unit pixel 1 is defined by three color display electrodes 5, 6, and 7.

In this case, although the effect of suppressing color misregistration as described above cannot be expected to be so great, since the filter layer of each color is subdivided, natural color mixing is performed.

FIG. 6 shows that in the configuration shown in FIG.
FIG. 3 is a schematic diagram showing an enlarged unit pixel 1 in a case where the unit pixel 1 is defined by three color display electrodes.

In this case, the effect of suppressing color misregistration can be obtained considerably. Applying the dimensions in Figure 3 to this example, the width of each filter layer (R), (G), and (B) is "a/4", and the width of the gap between the filter layers is "b/4". , the color shift that occurs when different colors are displayed is "a+b/2" or "a+b". Therefore, it can be seen that the color shift is reduced by half compared to the conventional example shown in FIG.

If the embodiment shown in FIGS. 5 and 6 is developed, "3n" (n=2, 3,
4,...) color display electrodes 5, 6, 7 are included, each filter layer is subdivided into arbitrary fineness,
It is possible to exhibit the desired color mixing effect and the effect of preventing color shift.

In the embodiments shown in FIGS. 5 and 6, each unit pixel is polymerized by one filter layer at the left and right ends, but this can be ignored depending on the application, and moreover, By subdividing the filter layer, the overall width of the overlapping portion can be made as small as desired.

Although the above embodiment relates to a liquid crystal display element that displays three colors, it is also possible to construct a liquid crystal display element that displays four or more colors in the same manner.
In that case, as a matter of course, the number of sets of color display electrodes equal to the number of desired colors will be regularly arranged as in the above embodiment.

FIG. 7 is a schematic diagram showing another example of the arrangement pattern of color display electrodes according to the present invention.

The three sets of color display electrodes 8, 9, 10 each have 2
The leg pieces of these bifurcated parts are also formed with
Color filter layers of three colors "R", "G", and "B" are formed for each color display electrode 8, 9, and 10, respectively.

The distance between the legs of the color display electrodes 8 and 9 is about 1/2 of the distance between the legs of the color display electrode 10.

A large number of color display electrodes 8, 9, 10 are arranged in such a manner that they face each other in the same plane and are slightly shifted in position, and both leg pieces of adjacent color display electrodes 8, 9 in one row are arranged. One leg of the color display device 10 in the opposing row is inserted between the legs, and the color display electrodes 8 and 9 in the opposing row are inserted between the legs of the color display electrode 10 in one row. One of the adjacent leg pieces (total of 2 pieces) of the two pieces are inserted.

FIG. 8 is a schematic diagram showing an enlarged unit pixel 1 when the unit pixel 1 is defined by each of two color display electrodes 8, 9, and 10 based on the electrode arrangement pattern of FIG. 7. .

In this case, unlike the embodiments described above, adjacent pixels do not overlap with each other, and the effect of suppressing color mixture and color shift can be obtained.

Similarly to the above, the width of each filter layer (R), (G), and (B) is "a/2", and the width of the gap between each filter layer is "b/2".
2", the color shift that occurs when displaying different colors is "3/4 (a + b)" or "3/2 (a + b
)'', and the color shift is reduced by about 25% compared to the conventional example shown in FIG.

FIG. 9 is a schematic diagram showing an enlarged unit pixel 1 when the unit pixel 1 is defined by a total of 12 color display electrodes 8, 9, and 10 in the electrode arrangement pattern shown in FIG. It is.

In this case, the effect of suppressing color shift is further improved. As before, set the width of each filter layer to “a/
4", and if the width of the gap between each filter layer is "b/4", the color shift that occurs when displaying different colors is
"3/8(a+b)" or "3/4(a+b)", and the color shift is reduced to about three-eighths compared to the conventional example shown in FIG.

If the embodiment shown in FIGS. 8 and 9 is developed, "3n" (n=2, 3,
By including the color display electrodes 8, 9, 10 (4, . . . ) and subdividing each filter layer into arbitrary fineness, the desired color mixing effect and color misregistration prevention effect can be achieved.

[Brief explanation of drawings]

FIG. 1 is a plan view schematically showing the configuration of a conventional multicolor liquid crystal display element, FIG. 2 is a vertical side view, and FIG. 3 is a schematic diagram showing electrodes of a conventional three-color display element. FIG. 4 is a schematic diagram showing an example of the arrangement pattern of color display electrodes in a multicolor liquid crystal display element according to the present invention, and FIG. 5 is a schematic diagram showing a first embodiment based on the arrangement pattern of FIG. 4. , FIG. 6 is a schematic diagram showing a second embodiment based on the arrangement pattern of FIG. 4, and FIG. 7 is another example of the arrangement pattern of color display electrodes in a multicolor liquid crystal display element according to the present invention. FIG. 8 is a schematic diagram showing the first embodiment based on the arrangement pattern of FIG. 7, and FIG.
The figure is a schematic diagram showing a second embodiment based on the arrangement pattern of FIG. 7. DESCRIPTION OF SYMBOLS 1... Unit pixel, 2-10... Color display electrode, 21...
Substrate, 22... Electrode, 23... Color filter layer, 2
4...Liquid crystal, 25...Sealing material.

Claims (1)

[Claims] 1. A color filter layer of one of three colors: red (R), green (G), and blue (B) is provided on the surface of the liquid crystal side of the two leg pieces that protrude in parallel with a constant width. A large number of the formed bifurcated fork-shaped color display electrodes are arranged in parallel so that adjacent colors are different to form a pair of color display electrode groups, and each leg of this pair of color display electrode groups is Between the legs of one of the color display electrodes in one color display electrode group, in order to arrange the three filter colors regularly so that they are arranged facing each other at equal intervals,
A multicolor liquid crystal display element characterized in that two adjacent leg pieces of color display electrodes in the other color display electrode group are inserted into each other. 2. In the color display electrode group, two adjacent leg pieces of the color display electrodes in the opposing color display electrode group are inserted between the leg pieces of all the color display electrodes in one pair of color display electrode groups. A multicolor liquid crystal display element according to claim 1. 3. The color display electrode group has two adjacent leg pieces of the color display electrode in the opposing color display electrode group inserted between the leg pieces of the color display electrode, and the two leg pieces of the color display electrode in the same color display electrode group. Claim 1, wherein leg pieces of one color display electrode of a desired color in the opposing color display electrode groups are inserted between the color display electrode groups and arranged alternately in a desired order. multicolor liquid crystal display element.