JPH01306819A - Color liquid crystal display device - Google Patents

Abstract

PURPOSE:To enhance the color mixability of color videos and to provide inconspicuousness to dot defects by nesting picture elements disposed dividedly to face 1st color filters and picture elements divided to face the 2nd color filters adjacent thereto to both sides of scanning signal lines or video signal lines. CONSTITUTION:The respective picture elements disposed in the extending row direction of the scanning signal line GT are divided to two. The transparent picture element electrodes ITO 1 of the respective divided picture elements are constituted into a comb shape in plane shape. Namely, the electrodes ITO 1 of the divided picture elements connected to the video signal lines SD 1 are so constituted as to be partially nested into the electrodes ITO 1 of the divided picture elements connected to the other video signal lines SD 1 adjacent to the row direction. The ratio of the color mixing per unit area (the ratio at which the different color filters intrude) is increased in this way, by which the color mixability of the color videos is enhanced, in addition, the other divided picture elements are lighted even if a lighting defect arises, by which the inconspicuousness is provided to the dot defects of the color videos.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a technique that is effective when applied to a color liquid crystal display device.

[Conventional technology]

The display of each pixel in the liquid crystal display section is performed using thin film transistors (TPT).
) Active matrix color liquid crystal display devices are known. This liquid crystal display device has liquid crystal sealed in a space between a lower transparent glass substrate and an upper transparent glass substrate. Inside of the lower transparent glass substrate (liquid crystal side)
A pixel consisting of a transparent pixel electrode and a thin film transistor that controls the voltage applied to the pixel electrode is provided on the surface of the pixel. A common transparent pixel electrode facing the color filter and the transparent pixel electrode is provided on the inner surface (liquid crystal side) of the upper transparent glass substrate.

Each pixel is arranged within a region surrounded by two scanning signal lines extending in the column direction and two video signal lines extending in the row direction. The planar shape of each pixel is approximately rectangular. The gate electrode of the thin film transistor of each pixel is connected to one of the two scanning signal lines. The drain electrode (or source electrode) of the thin film transistor of each pixel is connected to one of the two video signal lines. A source electrode (or drain electrode) of the thin film transistor is connected to the transparent pixel electrode.

The color filter is composed of three color filters: a red filter (R), a green filter (G), and a blue filter (B). Each color filter is arranged on the surface of the upper transparent glass substrate at a position facing each pixel, that is, within a region surrounded by the scanning signal line and the video signal line. The red filter, green filter, and blue filter are sequentially and repeatedly arranged in the direction in which the scanning signal line or the video signal line extends.

Regarding color liquid crystal display devices, for example, the patent application
No. 2-144913.

[Problem to be solved by the invention]

The aforementioned color liquid crystal display devices tend to have larger pixel sizes, and the present inventor is currently developing a 5-inch color liquid crystal display device having a large rectangular pixel size of approximately 0.3 x 0.3 [mm]. It is. The inventor of the present invention has discovered that a color liquid crystal display device having such large pixel size and rectangular pixels has a problem in that colors do not mix when a color image is viewed up close.

Furthermore, the inventors have discovered a problem in that as the pixel size increases, point defects in which one pixel is defective become very conspicuous.

SUMMARY OF THE INVENTION An object of the present invention is to provide a technique that can improve color mixing properties of color images of a color liquid crystal display device.

Another object of the present invention is to provide a technique that achieves the above object and makes point defects less noticeable.

The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[Means to solve the problem]

A brief overview of typical inventions disclosed in this application is as follows.

In a color liquid crystal display device, pixels facing a first color filter are divided and arranged on both sides of a scanning signal line or a video signal line, and the divided pixels are opposed to another second color filter adjacent thereto. The divided pixels are arranged so as to intersect with each other.

(Function) According to the above-mentioned means, since the ratio of color mixing per unit area is increased, the color mixing property of a color image can be improved.

Further, even if a point defect occurs in one of the divided pixels and a lighting failure occurs, the other divided pixel can be turned on, so that the point defect in a color image can be made less noticeable.

Hereinafter, the configuration of the present invention will be described together with an embodiment in which the present invention is applied to an active matrix color liquid crystal display device.

In addition, in all the times for explaining the examples, ′
Components having the same function are given the same reference numerals, and repeated explanations thereof will be omitted.

(Example) One pixel of the liquid crystal display section of an active matrix color liquid crystal display device which is an example of the present invention is shown in
A plan view) and FIG. 2 (a sectional view taken along the line ■-■ in FIG. 1).

As shown in FIGS. 1 and 2, the liquid crystal display device has a
It has a pixel composed of a thin film transistor TPT and a transparent pixel electrode ITOI.

The lower transparent glass substrate SUB 1 has a thickness of approximately 1.1 mm.

The thin film transistor TPT mainly includes a gate electrode GT, a gate insulating film GI, an i-type semiconductor layer AS, and a drain electrode (
(or source electrode) SDI, and a source electrode (or drain electrode) SD2.

For example, in order to prevent disconnection of the gate electrode GT,
It is formed from a composite film in which an MO layer is laminated on a Cr layer. The gate electrode GT is integrated with and connected to a scanning signal line (horizontal signal line). The scanning signal lines (GT) extend in the column direction in FIG. 1, and a plurality of scanning signal lines (GT) are arranged at predetermined intervals in the row direction.

The i-type semiconductor layer AS is used as a channel formation region of the thin film transistor TPT. The i-type semiconductor layer As is formed of an amorphous silicon film or a polycrystalline silicon film.

Each of the drain electrode SDI and the source electrode SD2 is provided on the i-type semiconductor layer As at a distance from each other. Each of the drain electrode SDI and the source electrode SD2 is configured such that when the bias polarity of the circuit changes, the source and drain are interchanged in operation. Each of the drain electrode SDI and the source electrode SD2 is formed by laminating, for example, a Cr layer and an AQ layer sequentially from the lower layer side in contact with the i-type semiconductor layer AS. It is formed as a barrier layer to prevent reaction with the AQ layer. AQ
The layer is a low resistance material that increases the speed of signal transmission and is used as the main wiring material.

A transparent pixel electrode IT01 provided for each pixel is connected to one source electrode SD2 of the thin film transistor TPT. The transparent pixel electrode IT○1 constitutes one of the pixel electrodes of the liquid crystal display section. The other drain electrode SDI is integrated with and connected to a video signal line (vertical signal line). The video signal lines (SDI) extend in the row direction in FIG. 1, and a plurality of video signal lines (SDI) are arranged at predetermined intervals in the column direction.

As shown in FIGS. 1 and 2, one pixel.

It is divided into two and arranged on both sides of the video signal line SDI. That is, one divided pixel obtained by dividing one pixel is arranged on one side (right side) of the video signal line SD1, and includes a thin film transistor TFTI and a transparent pixel electrode ITOI connected thereto. The other divided pixel is arranged on the other side (left side) of the video signal line SDI, and includes a thin film transistor TPT2 and a transparent pixel electrode IT connected thereto.
It is composed of OI. As shown in FIG. 3 (a plan view showing the pixel arrangement and color filter arrangement), each pixel arranged in the column direction in which the scanning signal line GT extends is divided into two in the column direction. The transparent pixel electrode ITOI of each divided pixel has a comb-shaped planar shape. That is, the transparent pixel electrode ITOI of the divided pixel connected to the video signal line SDI is configured to partially enter the transparent pixel electrode ITO1 of the divided pixel connected to another video signal line SDI adjacent in the column direction. ing.

In the area surrounded by the two scanning signal lines GT and the two video signal lines SD1, there are divided pixels approximately half the size of the pixels connected to one of the video signal lines SDI, and a divided pixel connected to the other video signal line SDI. Divided pixels approximately half the size of the pixels connected to the line SDI are arranged.

A protective film PSVI is provided over the thin film transistor TPT and the transparent pixel It pole IT○1. Protective film PSVI
is formed mainly to protect the thin film transistor (rFT) from moisture, etc., and is formed of a silicon oxide film or silicon nitride film that is highly transparent and has good moisture resistance.

A shielding film LS is provided above the protective film PSVI on the thin film transistor TFT to prevent external light from entering the i-type semiconductor layer AS used as a channel formation region. The shielding film LS is formed of, for example, an AQ layer or a Cr layer.

The liquid crystal LC includes a lower alignment film 0RI1. which sets the orientation of liquid crystal molecules in a space formed between the lower transparent glass substrate SUB1 and the upper transparent glass substrate 5UB2. It is defined and sealed in each of the upper alignment films 0RI2.

The lower alignment film 0RII is formed on the protective film PSVI on the lower transparent glass substrate 1 side. The lower alignment film 0RII is formed of, for example, a photosensitive polyimide resin material.

On the inner surface (liquid crystal side) of the upper transparent glass substrate 5UB2, a color filter FIL, a protective film Psv2, a common transparent pixel electrode ITO2, and the upper alignment film RI2 are sequentially laminated.

The common transparent pixel electrode IT○2 is a transparent pixel electrode ITO provided for each pixel on the lower transparent glass substrate SUB l side.
It is configured integrally with another common transparent pixel electrode ITO2 that is opposite to and adjacent to I.

The color filter FIL is composed of three color filters: a red filter (R), a green filter (G), and a blue filter (B). Each color filter is arranged at a position facing each pixel, and a color filter of the same color is arranged to face each divided pixel within one pixel. The color filter FIL is
As shown in Figure 3, there are red filters and green filters in the column direction.

The blue filters are arranged repeatedly in sequence, and the arrangement is shifted by one pixel for each column. The color filter FIL can be formed by, for example, dyeing a film mainly made of acrylic resin for each pixel or each divided pixel with a dye.

The protective film PSV2 is provided to prevent the dyes used to dye the color filters FIL into different colors from leaking into the liquid crystal LC. The protective film PSV2 is made of, for example, a transparent resin material such as acrylic resin or epoxy resin.

In the liquid crystal display device configured in this way, the layers on the lower transparent glass substrate SUB1 side and the upper transparent glass substrate 5UB2 side are formed separately, and then the upper and lower transparent glass substrates 5
It is assembled by overlapping UBI and 5UB2 and sealing liquid crystal LC between them.

Lower transparent glass substrate SUB 1, upper transparent glass substrate 5
A polarizing plate POL is formed on the outer surface of each UB2.

In this way, in a color liquid crystal display device, pixels facing the first color filter are divided and arranged on both sides of the video signal line SDI, and the divided pixels and the other second color filter adjacent thereto are arranged separately. By arranging opposing divided pixels so that they intersect with each other, different color filters can be inserted into each other in a pattern that is finer than the size of a single pixel, and the ratio of color mixing per unit area (different color filters can be Since it is possible to increase the mixing rate of color images, it is possible to improve the color mixing properties of color images.

In addition, by dividing the pixels, even if a point defect occurs in one of the divided pixels and a lighting failure occurs, the other divided pixel can be turned on, so that the point of color images can be turned on. Defects can be made less noticeable 8 Also, in the embodiment described above, one pixel is divided and arranged on both sides of the video signal line SDI, but in the present invention, one pixel is divided and arranged on both sides of the scanning signal line GT. It can also be placed.

The invention made by the present inventor has been specifically explained based on the above embodiments, but the present invention is as follows.

It goes without saying that the invention is not limited to the embodiments described above, and that various changes can be made without departing from the spirit thereof.

For example, in the present invention, one pixel may be divided into four or six and arranged on both sides of the scanning signal line or the video signal line.

〔Effect of the invention〕

A brief explanation of the effects obtained by typical inventions disclosed in this application is as follows.

The color mixing properties of color images of a color liquid crystal display device can be improved, and one-point defects can be made less noticeable.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing one pixel of a liquid crystal display section of an active matrix color liquid crystal display device which is an embodiment of the present invention. FIG. FIG. 3 is a plan view showing the pixel arrangement and color filter arrangement of the liquid crystal display section. In the figure, SUB 1... Upper transparent glass substrate, 5UB2
... lower transparent glass substrate, FIL ... color filter, R, G, B ... color filter, LC ... liquid crystal, T
PT...Thin film transistor, ITOI, ITO2...
・Transparent pixel electrode, GT...gate electrode or scanning signal line, SDI...drain electrode or video signal line, SD2・
...It is a source electrode. TPT...Thin film transistor ITO...Transparent pixel electrode GT...Gate electrode or scanning signal line SDI...Drain electrode or video signal line S Port 2...Source electrode

Claims (1)

[Claims] 1. In a color liquid crystal display device in which a pixel is arranged at the intersection of a scanning signal line and a video signal line, and a color filter is arranged at a position opposite to this pixel, a color filter is arranged opposite to the first color filter. The pixels are divided and arranged on both sides of the scanning signal line or video signal line, and the pixels are divided and arranged on both sides of the divided pixel and another scanning signal line or video signal line adjacent thereto. A color liquid crystal display device, characterized in that a two-color filter and opposing pixels are arranged so as to intersect with each other. 2. A patent characterized in that each of the divided pixels is constituted by a series circuit of a thin film transistor and a transparent pixel electrode, and the transparent pixel electrode of this pixel and the color filter facing it are constituted in a comb shape. A color liquid crystal display device according to claim 1. 3. The color filter is configured by sequentially and repeatedly arranging a red filter, a green filter, and a blue filter in the direction in which the video signal line or the scanning signal line extends. The color liquid crystal display device according to item 1 or 2.