JPH0561035A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To obtain a liquid crystal display device where two or more kinds of patterns are selectively displayed on the same plane. CONSTITUTION:Three kinds of independent segment electrodes 24-26 are formed by ITO, etc., on a segment electrode substrate 20, and color filters 28-30 having different colors respectively are formed on the segment electrodes 24-26 so that they may constitute characters such as A, B and C as a whole. Therefore, by respectively individually driving the segment electrodes 24-26, the characters such as A, B and C are displayed in different colors on the same plane.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device in which segment electrodes have an interdigital shape.

[0002]

2. Description of the Related Art Liquid crystal display devices are roughly classified into segment type liquid crystal display devices and dot matrix type liquid crystal display devices. Since the segment type liquid crystal display device has a simple structure and its segment electrodes can be formed in any shape, it has the characteristic that curved lines and diagonal lines are displayed faithfully, while it has two or more patterns on the same plane. Have a problem that can not be displayed. Therefore, the segment type liquid crystal display device is mainly used for displaying numbers and displaying special characters. On the other hand, although the dot matrix type liquid crystal display device is capable of various displays, it has a problem that curved lines, oblique lines, etc. cannot be displayed smoothly with a device having a small number of dots. Therefore, there is a demand for a liquid crystal display device having a simple structure capable of displaying a plurality of patterns on the same plane and faithfully displaying curved lines and diagonal lines.

A segment type liquid crystal display device will be described below with reference to FIGS. Glass is used for the transparent substrates (42) and (52) of the common electrode substrate (40) and the segment electrode substrate (50), and a few percent of indium oxide or tin oxide is mixed on the transparent substrate (42) (52). A transparent conductive film of indium oxide (ITO) is formed, and the common electrode (44) of the common electrode substrate (40) is formed. Subsequently, as shown in FIG. 6, a light-shielding film (46) having an 8-shaped window formed on the common electrode (44) is formed of a metal such as nickel or chromium. Further, as shown in FIG. 7, the transparent conductive film formed on the segment electrode substrate (50) is etched into an interdigital shape to form two kinds of segment electrodes (54) and (56). These segment electrodes (5
4) (56) is at the position corresponding to the 8-shaped pattern of the light shielding film (46),
It has a uniform pattern and the same size.

Referring to FIG. 8, a liquid crystal display device compatible with color display has a first segment electrode (5
A red color filter (58) is formed on 4), and a green color filter (60) is formed on the second segment electrode (56). Then, on the segment electrode substrate (50) and the common electrode substrate (40), an alignment film (4
8) After forming (62), both substrates are arranged at an interval of about 10 μm so that the segment electrode and the common electrode face each other, and the liquid crystal (66) is filled in the substrate gap.

This liquid crystal display device displays a yellow color when both the first segment electrode (54) and the second segment electrode (56) are simultaneously driven, and the first segment electrode (54)
When only the second segment electrodes (56) are independently driven, green display is performed, and when only the second segment electrode (56) is independently driven, green display is performed.

[0006]

Although the above-mentioned segment type liquid crystal display device has reached a satisfactory level in terms of color display and smooth pattern display, it is possible to display two or more types of patterns on the same plane. Have a problem that can not be. On the other hand, the liquid crystal display device of the dot matrix display system can display various patterns as described above, but has a problem that a curved line, a slanted line and the like cannot be smoothly displayed with a small number of dots. Therefore, an object of the present invention is to provide a liquid crystal display device having a simple structure, which can smoothly display two or more types of patterns on the same plane.

[0007]

SUMMARY OF THE INVENTION The main feature of the present invention is that color filter layers of two or more colors having independent patterns are alternately formed on a fine interdigital electrode.

[0008]

Since the color filter layers of two or more types of independent patterns are alternately formed on the fine interdigital electrodes, it is possible to display a plurality of patterns on the same plane and to faithfully follow the electrode shape. Since different patterns are displayed, curved lines and diagonal lines are displayed faithfully.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. 1 is a plan view of the segment electrode substrate, FIG. 2 is a cross-sectional view of the segment electrode substrate and the common electrode substrate which are arranged to face each other, and FIGS. 3 to 5 show display examples according to the embodiment. Referring to FIGS. 1 and 2, glass is used for the transparent substrates (12) and (22) of the common electrode substrate (10) and the segment electrode substrate (20), and indium oxide or tin oxide is deposited on the transparent substrates. A transparent conductive film of indium oxide (ITO) mixed with several percent is formed. Then, as shown in FIG.
The transparent conductive film formed on the segment electrode substrate (20) is interdigitally etched to form three kinds of segment electrodes (24), (25) and (26). On the other hand, the common electrode substrate (1
The transparent conductive film of (0) is left on substantially the entire surface to form the common electrode (14). Since the planar structure of the common electrode substrate (10) is simple, its illustration is omitted.

The red color filter (28), the green color filter (29) and the blue color filter (30) are formed on the respective segment electrodes (24) (25) (26) by means such as electrodeposition. , The liquid crystal display device as a whole is selectively formed so as to form characters such as A, B, and C. Furthermore, the color filters (28) (29) (30) on the segment electrodes (24) (25) (26)
A light-shielding film (30) is formed of nickel or the like on the portion where the light is not formed.

On the segment electrode substrate (20) and the common electrode substrate (10), an alignment film (1
After forming 8) and 32, both substrates are arranged at an interval of about 10 μm so that the segment electrodes 24, 25, and 26 and the common electrode 14 face each other, and the liquid crystal 36) is filled.

Therefore, when the segment electrode (24) of the segment electrode substrate (20) is independently driven, that is, the segment electrode
When voltage is applied between (24) and common electrode (14), for example, as shown in FIG.
The letter A shown in is displayed in red and the segment electrode (2
When 5) is independently driven, the letter B is displayed in green on the substantially same plane although it is shifted by one segment electrode width, and when the segment electrode (26) is independently driven, it is shifted by one segment electrode width and is almost the same. The letter C is displayed in blue on the plane. Since the liquid crystal display device of the present invention faithfully displays the patterns of the color filters (28) (29) (30), not only the curves and diagonal lines are smoothly displayed, but also two or more different patterns are displayed on the same plane. can do. The embodiment of multi-color display has been described above,
The present invention can also be realized in monocolor display.

[0013]

As described above, since the liquid crystal display device of the present invention displays different patterns by the interdigital electrodes, the structure is simple,
It is possible to smoothly display a plurality of patterns on the same plane.

[0014]

[Brief description of drawings]

FIG. 1 is a plan view of a segment electrode substrate according to an embodiment of the present invention.

FIG. 2 is a sectional view of an embodiment of the present invention.

FIG. 3 is a diagram illustrating a display example of an embodiment.

FIG. 4 is a diagram illustrating a display example of an embodiment.

FIG. 5 is a diagram illustrating a display example of an embodiment.

FIG. 6 is a plan view of a common electrode substrate of a conventional example.

FIG. 7 is a plan view of a conventional segment electrode substrate.

FIG. 8 is a sectional view of a conventional example.

[Explanation of symbols]

 10 common electrode substrate 12 transparent substrate 14 common electrode 16 light shielding film 18 alignment film 20 segment electrode substrate 22 transparent substrate 24 first segment electrode 25 second segment electrode 26 third segment electrode 28 color filter 29 color filter 30 color filter 32 alignment film 36 liquid crystal

Claims (3)

[Claims] 1. A common electrode substrate in which a common electrode is formed in a predetermined shape by a transparent conductive material on a glass substrate, and a fine interdigital electrode is formed on the glass substrate, and two or more kinds of colors are formed on the interdigital electrode. 2. A liquid crystal display device in which the segment electrode substrate having the color filter layers alternately formed is arranged to face each other, wherein the color filter layer is formed in a predetermined display pattern. 2. The liquid crystal display device according to claim 1, wherein the respective color filter layers are formed in different display patterns. 3. The liquid crystal display device according to claim 1, wherein a light-shielding film is formed in a region where the color filter layer is not formed on the interdigital electrodes.