JPH05241144A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To prevent harmful influence due to the difference in color tone between the non-display and display regions of a negative display type liq. crystal display device. CONSTITUTION:The leading wires 5 of a segmented electrode 2 formed on an electrode substrate 1 for segments are made extremely fine and a light shielding film 6 is formed only on the leading wires 5. A pectinate common electrode is formed on a substrate 3 for a common electrode over the almost entire surface and a color filter layer is formed on the common electrode.

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, and more particularly to a liquid crystal display device capable of multicolor display.

[0002]

2. Description of the Related Art Conventionally, a dot matrix type liquid crystal display element or a general segment type liquid crystal display element has been used as a liquid crystal display element for displaying a numeral by a segment method capable of switching two or more display colors (hereinafter referred to as multi-color). It is known that the common electrode of the above is based on an interdigital system of a plurality of lines.

The dot matrix type has problems that the connection between the drive circuit parts and the plurality of lead wires is complicated, and the display performance is deteriorated as compared with the segment type liquid crystal display element having a narrow operation margin. On the other hand, the interdigital type does not have the above-mentioned problems,
Good multi-color display can be obtained. An interdigital multi-color liquid crystal display device is disclosed, for example, in Japanese Laid-Open Patent Publication No. 59-136718 (G02F 1 /).
133), and detailed description is omitted.

[0004]

As described above, the interdigital system is optimal for obtaining a good multicolor display. However, the above-mentioned JP-A-59-1
The multi-color interdigital system described in Japanese Patent No. 36718 has the following problems. That is, in the above-mentioned conventional structure, only the display area has an interdigital shape, and since the color filter layer is formed only on the common electrode thereof, the non-display area and the display area are divided into the non-display area and the display area during lighting or non-lighting. Color balance is poor.

Specifically, the color tone of the non-display area where the color filter layer is not formed is coloring due to the optical rotatory dispersion of the liquid crystal, whereas the color tone of the display area is due to the color rotatory dispersion of the liquid crystal and the color filter layer. Since the color is a composite color with the absorption of light, the two have different color tones, and the color balance appears to be poor to the eyes of the observer. Further, in the conventional structure, since only the display area has an interdigital shape as described above, a common electrode substrate is required for each different pattern, which is not suitable for high-mix low-volume production. .

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to prevent the adverse effect due to the difference in color tone between the non-display area and the display area and to share the common electrode side substrate. Another object of the present invention is to provide a multi-color liquid crystal display device that can be used for.

[0007]

[Means for Solving the Problems]
In order to achieve the object, in the liquid crystal display device of the present invention, a pair of glass substrates are arranged to face each other, a plurality of segment electrodes are formed on the inner surface of one of the glass substrates, and a common electrode is formed on the inner surface of the other glass substrate. A liquid crystal display device for displaying a desired shape, wherein the common electrode is formed in a comb shape over substantially the entire area of the other glass substrate, and a color filter layer is formed on the common electrode formed in the comb shape. And a light-shielding film is formed only on the segment electrode routing lines extending from the segment electrodes.

The liquid crystal display device according to the present invention is
A pair of glass substrates are arranged to face each other, a plurality of segment electrodes are formed on the inner surface of one of the glass substrates, a common electrode is formed on the inner surface of the other glass substrate, which is a liquid crystal display device for displaying a desired shape, The common electrode is formed in a comb shape over substantially the entire area of the other glass substrate, color filter layers of different colors are formed on the comb-shaped common electrode, and the common electrodes are extended from the segment electrodes. The metal light-shielding film is formed by electroless plating only on the segment electrode wiring lines.

[0009]

In the liquid crystal display device configured as described above, there is no difference in color tone between the non-display area and the display area. Further, since there is no difference in color tone and brightness between the non-lighted portion of the display area and the non-display area, the display quality of the multi-color liquid crystal can be significantly improved. And
With this configuration, the glass substrate on which the common electrode is formed can be commonly used, which is particularly effective in the case of high-mix low-volume production.

[0010]

EXAMPLES The liquid crystal display device of the present invention will be described below based on the examples shown in FIGS. FIG. 1 shows a segment electrode substrate (1) on which a segment electrode (2) is formed.
FIG. 2 is a plan view of a common electrode substrate (3) having a common electrode (4) arranged opposite to the segment electrode substrate (1).

Further, (5) is a lead wire of the segment electrode, (6) is a light shielding film, and (7) is a color filter layer. A glass substrate is used as each of the substrates (1) and (3), and a transparent electrode having a desired shape such as a segment for desired display is formed on the glass substrate by a transparent electrode material such as indium oxide.

On one of the substrates (1), as shown in FIG.
Segment electrodes (2) that make up a square segment
Is formed, and the routing line (5) is formed to extend from each segment electrode (2). The line width of the routing line (5) is formed as thin as possible so as not to be noticeable to the eyes of the observer. For example, it is formed in the range of 200 μm to 50 μm. There is a concern that the line resistance may increase and the display quality may be deteriorated by forming the line width narrow. However, in the present invention, since a light-shielding film described later is attached on the routing line (5), the problem due to the line resistance is Does not occur.

As described above, the light-shielding film (6) is formed on the wiring line (5) which is extremely fine. The light-shielding film (6) reduces the line resistance of the routing line (5) as described above, and also shields the lighting by the routing line (5) during display of the display device. The light shielding film (6) is formed by electroless plating of a metal such as nickel. According to this electroless plating, a metal such as nickel is uniformly deposited on the segment electrode (2) and its routing wire (5), and then the segment electrode (2).
By removing only the upper metal by etching, the light-shielding film (6) can be easily formed only on the extra-fine routing line (5).

By the way, on the other substrate (3), as shown in FIG.
As shown in, the common electrode (4) is formed on the substantially entire surface of the substrate (3). That is, the common electrode (4) is formed in a comb shape over substantially the entire surface of the substrate (3) as shown in FIG. On the common electrode (4), R. The color filter layer (7) such as G is formed by means of an electrodeposition method or the like. Although the common electrode (4) shown in FIG. 2 has a comb-teeth shape divided into two, the common electrode (4) can be divided into two or more. Then, the color filter layer (7) can be formed by the number of colors corresponding to the divided electrodes.

The substrates (1) and (3) shown in FIGS. 1 and 2.
Is subjected to a predetermined alignment treatment, and although not shown, the electrodes (2) and (4) are arranged and fixed so that the electrodes (2) and (4) face each other.
Then, liquid crystal is injected into the space between the substrates, two polarizing plates are arranged outside the substrates (1) and (3) so that the polarization axes are substantially parallel, and a predetermined liquid crystal is displayed. According to such a display device, since the light-shielding film is not formed on substantially the entire non-display area, the difference in color tone between the non-display area and the display area does not occur, and the non-lighted portion of the non-display area is not There is no difference in color tone and brightness from the display area.

[0016]

As described above in detail, according to the present invention, the light-shielding film is provided only on the wiring lines of the segment electrodes, and the common electrode is formed in a comb shape over the entire surface of the substrate. There is no difference in color tone between the display area and the non-display area, and there is no difference in color tone and brightness between the non-lighted portion of the display area and the non-display area. As a result, it is possible to provide a multi-color display device having extremely excellent display quality and visibility.

Further, in the present invention, since the common electrode is formed in a comb shape in a stripe shape over substantially the entire surface of the substrate, the common electrode substrate can be commonly used.
This is especially effective for high-mix low-volume production.

[Brief description of drawings]

FIG. 1 is a plan view showing a segment electrode substrate of the present invention.

FIG. 2 is a plan view showing a common electrode substrate of the present invention.

[Explanation of symbols]

 (1) Segment electrode substrate (2) Segment electrode (3) Common electrode substrate (4) Common electrode (5) Lead wire (6) Light shielding film (7) Color filter layer

Claims (2)

[Claims] 1. A pair of glass substrates are arranged to face each other, a plurality of segment electrodes are formed on the inner surface of one of the glass substrates, and a common electrode is formed on the inner surface of the other glass substrate.
A liquid crystal display device for displaying a desired shape, wherein the common electrode is formed in a comb shape over substantially the entire area of the other glass substrate, and a color filter layer is formed on the common electrode formed in the comb shape. A liquid crystal display device, characterized in that a light-shielding film is formed only on the segment electrode lead-out line extending from the segment electrode. 2. A pair of glass substrates are arranged to face each other, a plurality of segment electrodes are formed on the inner surface of the one glass substrate, and a common electrode is formed on the inner surface of the other glass substrate,
A liquid crystal display device for displaying a desired shape, wherein the common electrode is formed in a comb shape over substantially the entire area of the other glass substrate, and different color colors are formed on the common electrode formed in the comb shape. A liquid crystal display device, wherein a filter layer is formed, and a metal light-shielding film formed by electroless plating is formed only on the segment electrode routing lines extending from the segment electrodes.