JPH0814666B2 - Color display liquid crystal display device - Google Patents

Description

The present invention relates to a color display liquid crystal display device having a color filter in a liquid crystal display element.

[Conventional technology]

FIG. 3 is a diagram showing an example of this type of color display liquid crystal display device. FIG. 3 (a) is a plan view of relevant parts, and FIG. 3 (b) is a cross section taken along line BB 'in FIG. 3 (a). FIG. 11C is a sectional view taken along the line CC ′ of FIG. In the figure, a plurality of upper electrodes 3 and lower electrodes 4 made of a transparent conductive film are respectively applied in a strip shape on the opposing surfaces of the upper substrate 1 and the lower substrate 2 made of a transparent glass plate so as to be orthogonal to each other. A liquid crystal alignment film 5 is formed on the surface on which the upper electrode 3 and the lower electrode 4 are formed, and the surface of the liquid crystal alignment film 5 is rubbed. Further, on the lower electrode 4, for example, red, green, and blue 3 films are formed. Color filters 6
R, 6G, 6B are sequentially and repeatedly formed and arranged, and
The upper substrate 1 and the lower substrate 2 are separated from each other by a predetermined distance and their peripheral portions are sealed with a sealing material 7 containing a spacer to form an external device (cell). TN (Tw
isted Nematic) Liquid crystal 8 is enclosed to form a liquid crystal display element 9. Further, on the outer surface of the liquid crystal display element 9, that is, on the outer surfaces of the upper substrate 1 and the lower substrate 2, the polarizing plates or the lower polarizing plates 11 and 11 are arranged with their polarization axes or absorption axes parallel to each other.
Are bonded to each other to form a color display liquid crystal display device.

In the color display liquid crystal display device configured as described above, for example, in the case of red display, by applying a predetermined voltage between the signal electrode on which the red filter 6R is formed and the scanning electrode, the optical display of the TN liquid crystal 8 is performed. It is possible to recognize as a red display pattern from the upper substrate 1 side by changing the target property, that is, by transmitting the light incident on the liquid crystal portion corresponding to the red filter 6R. Further, the green display pattern and the blue display pattern can be displayed in the same manner. Further, white display is possible by simultaneously applying a predetermined voltage between the signal electrode and the scanning electrode corresponding to the red color filter 6R, the green color filter 6G and the blue color filter 6B. As described above, many colors can be displayed by combining the respective colors.

[Problems to be solved by the invention]

However, in the color display liquid crystal display device configured as described above, when the display screen is enlarged, the dispersion of the cell thickness control spacers interposed between the upper substrate 1 and the lower substrate 2 is biased to one side. Or, when the particles are not dispersed in a certain amount, there are problems that the central portion and the peripheral portion of the image display surface are likely to have irregularities, the so-called cell thickness becomes non-uniform, and the display image quality is degraded.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to obtain a uniform cell thickness over the entire display surface and to obtain a liquid crystal display element of this type with high productivity. An object is to provide a color display liquid crystal display device. Another object is to provide a color display liquid crystal display device capable of improving the contrast ratio of a display image.

[Means for solving problems]

The color display liquid crystal display device according to the present invention separates the color filters of each color from each other and the liquid crystal and the lower electrode corresponding to the color filters of each color, and the color filter array of each color is arranged such that one end is in contact with or in proximity to the lower substrate. A black stripe filter including spacers is extended between them.

[Work]

In the present invention, the color filters of each color and the liquid crystal and the lower electrode corresponding to the color filters of the respective colors are separated from each other, and a spacer is included between the color filter arrays of the respective colors so that one end is brought into contact with or close to the lower substrate. By extending the black stripe filter, unnecessary light entering the image display surface from the outside is blocked. Further, the spacers are uniformly dispersed between the upper substrate and the lower substrate, which are arranged to face each other, in a constant amount, and the two substrates are uniformly held with the spacer diameter.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing an embodiment of a color display liquid crystal display device according to the present invention. FIG. 1 (a) is a plan view of a main part, and FIG. 1 (b) is a sectional view taken along line BB 'in FIG. 1 (a). The drawing and the drawing (c) are cross-sectional views taken along the line CC 'of the drawing (a), and the same or corresponding portions as those in the above-mentioned drawings are denoted by the same reference numerals. In the figure, a plurality of lower electrodes 4 are formed at predetermined intervals in the other direction (vertical direction) on the lower substrate 2 facing the plurality of upper electrodes 3 formed in one direction (horizontal direction) on the upper substrate 1. On the lower electrode 4 of each color.
6R, 6G, and 6B are formed with a constant repetition period. Further, on the lower substrate 4 on which the lower electrode 4 and the color filters 6R, 6G, 6B of the respective colors and the alignment film 5 are formed,
Black stripe filters 12 including spacers are formed and arranged at mutual intervals in the arrangement direction of the color filters 6R, 6G, 6B of the respective colors. As shown in FIG. 2, the black stripe filter 12 is formed by forming color filters 6R, 6G, 6B of respective colors on a lower electrode 4 (not shown), and then, for example, on the lower substrate 2 having an alignment film 5 formed thereon. A black adhesive 13 made by mixing a translucent spacer having a diameter of about 7 μm and a black dye is provided, and liquid crystal injection ports 2A are provided between the color filters 6R, 6G, 6B of each color and the peripheral portion by screen printing or the like. It is formed by printing and applying it, then facing the upper electrode 1 and the corresponding upper substrate 1 on which the alignment film 5 is formed, and adhering them. In this case, the seal for sealing the upper substrate 1 and the lower substrate 2 is simultaneously formed by the black adhesive 13 containing the spacer. Of course, it is needless to say that the black stripe filter 12 and the black adhesive 13 as a seal are properly spaced.

According to this structure, the color filters 6R, 6
By forming and arranging the black stripe filter 12 including the spacers at intervals between the G and 6B arrangement directions, unnecessary light entering from the outside to the image display surface is blocked, the contrast ratio is improved, and the opposing arrangement is performed. The space between the upper substrate 1 and the lower substrate 2 is set to a black stripe filter.
Spacers contained in 12 and the peripheral sealant in a constant amount are evenly distributed over each part in a constant amount and are regulated by the spacer diameter, so irregularities occur in the center and peripheral parts of the image display surface. It becomes difficult to achieve this, and a uniform cell thickness is realized. Further, by forming the black stripe filter 12 including the spacers at the intervals between the color filters 6R, 6G, 6B of the respective colors in the arrangement direction, the black stripe filter forming step and the spacer Since the spraying process and the sealing material applying process can be performed all at once by only the printing applying process of the black adhesive 13 which is a mixture of the spacer and the black dye as described in FIG. 2, the number of processes is significantly increased. Will be reduced. It should be noted that it may be difficult to inject the liquid crystal 8 between the cells by providing the plurality of black stripe filters 12 between the upper substrate 1 and the lower substrate 2, but the viscosity of the liquid crystal 8 should be reduced. It is possible to inject easily.

〔The invention's effect〕

As described above, according to the present invention, each color filter is separated from each color filter and the liquid crystal and the lower electrode corresponding to each color filter, and each color filter array is arranged so that one end is in contact with or in proximity to the lower substrate. Since the black stripe filters including the spacers are provided so as to extend between each other, unnecessary light that enters the image display surface from the outside is blocked, so that the contrast ratio of the displayed image can be significantly improved. Since the spacers are evenly distributed over each part between the upper and lower substrates and are evenly held by the spacer diameter, the cell thickness becomes uniform, the display screen can be made large, and the conventional color filter can be used. Spacers are no longer placed on the top,
By increasing the translucency, the quality of the display image is significantly improved, and the number of steps is shortened, resulting in excellent productivity.

[Brief description of drawings]

1 (a), (b), and (c) are plan views of a principal part showing an embodiment of a color display liquid crystal display device according to the present invention, a sectional view taken along the line BB 'of FIG. FIG. 2A is a cross-sectional view taken along the line CC ′ of FIG. 1A, and FIG. 2 is a plan view of relevant parts viewed from the upper substrate side of a lower substrate for explaining a method of manufacturing a color display liquid crystal display device according to the present invention. (a), (b), (c) is a main part plan view showing an example of a conventional color display liquid crystal display device, (a) of the same figure.
2B is a cross-sectional view taken along the line BB ′ in FIG. 1 ... upper substrate, 2 ... lower substrate, 2A ... liquid crystal inlet, 3 ...
… Upper electrode, 4 …… Lower electrode, 5 …… Liquid crystal alignment film, 6R …… Red color filter, 6G …… Green color filter, 6B ……
Blue color filter, 8 …… TN liquid crystal, 9 …… liquid crystal display element, 10 …… upper polarizing plate, 11 …… lower polarizing plate, 12 …… black stripe filter, 13 …… black adhesive.

Claims (1)

[Claims] 1. An upper substrate having a plurality of strip-shaped upper electrodes, and a lower substrate having a plurality of strip-shaped lower electrodes which are arranged to face the upper substrate and are orthogonal to the upper electrodes. A color display liquid crystal display device comprising at least a color filter of each color formed and arranged above or below the lower electrode in a repeating manner at a constant cycle, and a liquid crystal enclosed between the upper and lower substrates, A black stripe filter including a spacer between each color filter array is provided so that each color filter is separated from the liquid crystal and the lower electrode corresponding to each color filter, and one end is brought into contact with or close to the lower substrate. A color display liquid crystal display device characterized by being extended.