JP2001188228A - Transmission type color liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To guarantee uniform gap width also in a picture frame part, and to put the light leakage from the picture frame part inconspicuous in a transmission type liquid crystal display device. SOLUTION: In the transmission type color liquid crystal display, a liquid crystal display panel and the light source disposed at the rear side of the liquid crystal display panel are included, the inside of the surface of the liquid crystal display panel is divided by the display part D and the picture frame part E disposed around the display part D, a color filter 14 is provided in the display part D, in the picture frame part E, the leader electrode 32 which is connected to the transparent electrode 31 of the display part D is wired with the prescribed angle to the transparent electrode 31 to the oblique direction. A dummy color filter 14A is formed in the picture frame part E, and the leader electrode 32 is wired with the line width which covers 80% or more of each the pixel on dummy color filter 14A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmissive color liquid crystal display device, and more particularly, to a technique for making the degree of light shielding of a display portion and a frame portion substantially equal to each other.

[0002]

2. Description of the Related Art Normally, in addition to a display section for displaying various information, an extraction electrode connected to a transparent electrode of the display section is wired on the surface of a liquid crystal display panel regardless of whether it is a monochrome display or a color display. There is a portion that does not contribute to the display, which is called a picture frame.

A transmissive color liquid crystal display device is a liquid crystal display device having, for example, R, G, and B color filters on its display portion and a backlight disposed on the back side of the liquid crystal display panel. An example will be described with reference to the cross-sectional view of FIG.

That is, a transmission type color liquid crystal display device is
It includes a liquid crystal display panel 10 and a backlight (light source) 20 disposed on the back side thereof. Liquid crystal display panel 1
0 is the first transparent electrode substrate 1 on the front side called an F plate
1 and a second transparent electrode substrate 1 on the back side called an R plate
2 and a peripheral sealing material 13 made of, for example, an epoxy resin.
And a liquid crystal material such as STN liquid crystal is sealed in the cell gap. An in-plane spacer 16 is provided between the transparent electrode substrates 11 and 12 with the intention of keeping the cell gap uniform.

In the liquid crystal display panel 10, most of the area is allocated to the display portion D, but a frame portion E which does not contribute to display is provided around the display portion D. Since the liquid crystal display panel 10 performs color display, a color filter 14 is formed on the display section D on the side of the second transparent electrode substrate 12 which is an R plate, for example.

The color filter 14 includes, for example, R, G, and B pixels that are regularly arranged in a matrix, and between the pixels is shielded from light by a black mask 15. Further, a black mask 15 is also formed on the frame portion E in order to prevent light leakage from the frame portion E.

Although not shown, the color filter 14
A surface smoothing layer is formed thereon, and, for example, ITO
A transparent electrode made of (Indium Tin Oxide) is formed, and an extraction electrode connected to the transparent electrode is formed in the frame portion E.

In this case, the transparent electrode is formed as a stripe pattern along the X direction on one transparent electrode substrate side and along the Y direction on the other transparent electrode substrate side. The wiring is oblique to the terminal and is wired so as to reach a terminal portion provided on a predetermined side of the liquid crystal display panel 10.

[0009]

According to this conventional example,
Since the black mask 15 shields the pixels between the pixels of the color filter 14 and the frame portion E from light, the light from the backlight 20 does not leak from portions other than the pixels. However, there were the following problems.

That is, the black mask 15 is usually
The thickness is formed thinner than the color filter 14.
Therefore, in the region of the frame portion E, the in-plane spacer 16 is lowered accordingly. This causes unevenness in the gap, which adversely affects the display.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to ensure a uniform gap width even in a frame portion and to prevent light leakage from the frame portion. It is an object of the present invention to provide a transmission type liquid crystal display element which can make the display less noticeable.

In order to achieve the above object, the present invention includes a liquid crystal display panel formed by pressing a pair of transparent electrode substrates through a peripheral sealing material, and a light source disposed on the back side of the liquid crystal display panel. The inside of the liquid crystal display panel is divided into a display portion and a frame portion which is arranged around the display portion and does not contribute to display, and the display portion has a color in which light is shielded between pixels by a black mask. A transmissive color liquid crystal display element in which a filter is provided, and an extraction electrode connected to the transparent electrode of the display unit is wired in the frame at a predetermined angle with respect to the transparent electrode in an oblique direction. A dummy color filter in which the pixels are shielded from light by a black mask is also formed on the frame portion, and the extraction electrode is provided on the dummy color filter on each of the pixels. It is characterized by having a line width which covers 80% or more are wired.

According to the present invention, since the dummy color filter is provided also in the frame portion like the display portion, the gap width can be made uniform over the entire panel.
Note that the dummy color filter does not contribute to display, but has the same configuration as the color filter of the display unit.

Further, in the frame portion, since the extraction electrode is wired obliquely on the dummy color filter, each pixel has a covering portion covered by the extraction electrode and an exposed portion not covered by the extraction electrode (between the lines of the extraction electrode). Portion), and light leakage occurs from the exposed portion. However, in the present invention, since the covering portion of each pixel is 80% or more, light leakage from the frame portion does not stand out. In order to cover 80% or more of each pixel, the line width of the extraction electrode may be increased, and the line width of the extraction electrode may be relatively reduced.

In the definition of a pixel, three consecutive R, G, and B dots of a color filter may be collectively referred to as a pixel, but in this specification, the R and G of a color filter and a dummy color filter are referred to as a pixel. , B as a pixel.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. In this embodiment, the same reference numerals as those of the conventional example of FIG. 4 described above denote the same or corresponding components.

FIG. 1 is a sectional view of a main part of a transmission type color liquid crystal display device according to this embodiment, and FIG. 2 is a transmission plan view thereof. This transmissive color liquid crystal display element includes, as its basic configuration, a liquid crystal display panel 10A and a backlight 20 disposed on the back side thereof.

Although the backlight 20 is not different from the above-described conventional example, the liquid crystal display panel 10A is improved in the following points. That is, the liquid crystal display panel 1
The panel surface of 0A is partitioned into a display portion D and a frame portion E, and the display portion D is provided with a color filter 14. According to the present invention, the frame portion E is also provided with a dummy color filter 14A. Is provided.

Each of the color filter 14 and the dummy color filter 14A includes, for example, each of R, G, and B pixels regularly arranged in a matrix, and a black mask 15 (a hatched portion in FIG. 2) is provided between these pixels. ). That is, the color filter 14 and the dummy color filter 14A are formed in the same process, and both have the same configuration except that the dummy color filter 14A is not used for color display.

In this embodiment, the color filter 14
And the dummy color filter 14A is a second R plate.
Although the color filters 14 and 14A are formed on the inner surface side of the transparent electrode substrate 12, the color filters 14 and 14A may be formed on the first transparent electrode substrate 11 side which is an F plate. In any case, since the dummy color filters 14A are provided in the frame portion E, the in-plane spacers 16 do not drop and the gap width can be made substantially uniform over the entire panel.

A surface smoothing layer (not shown) is formed on each of the color filters 14 and 14A, and a transparent electrode 31 and an extraction electrode 32 made of, for example, ITO are formed thereon as shown in FIG. However, on the second transparent electrode substrate 12 side, the transparent electrodes 31 are formed in stripes along the X direction of the matrix arrangement of the color filters 14, and each pixel is covered by the transparent electrodes 31.

The extraction electrode 32 is extracted from one end of the transparent electrode 31 and is wired obliquely at a predetermined angle with respect to the transparent electrode 31 in the frame portion E. Accordingly, the extraction electrode 32 crosses the pixels R, G, and B of the dummy color filter 14A, and each pixel R, G, and B has a covering portion A covered by the extraction electrode 32 and indicated by a grid in FIG. And an exposed portion B (a portion between lines of the extraction electrodes 32, 32) which is not covered with the extraction electrode 32.

Since the black mask 15 is formed between the pixels of the dummy color filter 14A, no light leaks from between the pixels.
The cell gap is larger than the covering portion A because of the absence. Therefore, light of the backlight 20 leaks from the exposed portion B.

Therefore, in the present invention, by increasing the line width of the extraction electrodes 32 and relatively narrowing the line width of the extraction electrodes 32, 32, the ratio of the covering portion A to each pixel R, G, B is increased. Is 80% or more. By doing so, when the display portion D and the frame portion E are observed, light leakage at the frame portion E can be made inconspicuous. In addition,
The value of 80% or more is an empirical value.

Incidentally, in this embodiment, the width W of each pixel is 110 μm and the length H is 330 μm. On the other hand, the inclination angle of the extraction electrode 32 with respect to the transparent electrode 31 is 60 degrees, the line width thereof is 50 μm, and the line width of the extraction electrode 32 is 15 μm. The share was 85%. When the display portion D and the frame portion E were observed, there was no discomfort due to the light leakage of the frame portion E.

[0026]

According to the present invention, the following effects can be obtained. First, since a dummy color filter having the same configuration as that of the display portion is provided also in the frame portion, the cell gap can be made substantially uniform over the entire panel.

Next, by setting the area covered by the extraction electrode of each pixel of the dummy color filter in the frame portion to 80% or more, light leakage from the frame portion can be suppressed very slightly. And the border of the frame can be made inconspicuous.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a transmission type liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a schematic transmission plan view showing a main part of the embodiment.

FIG. 3 is a schematic plan view showing one pixel from FIG. 2;

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

 10, 10A Liquid crystal display panel 11, 12 Transparent electrode substrate 13 Peripheral sealing material 14 Color filter 14A Dummy color filter 15 Black mask 16 In-plane spacer 20 Backlight 31 Transparent electrode 32 Leader electrode A Covering part B Exposed part D Display part E Frame Department

Claims (1)

[Claims] A liquid crystal display panel formed by pressing a pair of transparent electrode substrates through a peripheral sealing material; and a light source disposed on a back side of the liquid crystal display panel. The display section is partitioned into a frame portion that does not contribute to display and is arranged around the display section, and the display section is provided with a color filter in which light is shielded between pixels by a black mask. In a transmission type color liquid crystal display element in which a lead-out electrode connected to the transparent electrode of the display unit is wired obliquely at a predetermined angle with respect to the transparent electrode in the frame portion, the frame portion also has A dummy color filter that is shielded from light by a black mask is formed, and the extraction electrode is arranged on the dummy color filter with a line width covering 80% or more of each pixel. Transmissive color liquid crystal display element characterized by being.