JPH05100226A - Liquid crystal display panel - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a liquid crystal display panel, and an object of the present invention is to realize a liquid crystal display panel in which deterioration of display characteristics due to domains or the like is suppressed by preventing generation of a portion which is not rubbed. [Structure] Of two glass substrates 20 and 21 constituting an active matrix type liquid crystal display panel, an alignment film provided on a glass substrate 20 in which a non-linear element is arranged in each pixel is formed on the glass substrate 20. The rubbing process is performed in a direction parallel to one of the signal lines and the scanning lines 22 and 23 arranged in a matrix.

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 panel. Specifically, the present invention relates to rubbing treatment of an alignment film provided on a substrate that constitutes a liquid crystal display panel.

[0002]

2. Description of the Related Art Liquid crystal display panels of matrix display type include those of a simple matrix display type and those of an active matrix type using a non-linear element such as a TFT (insulated gate thin film transistor). 2A and 2B are views showing an active matrix type liquid crystal display panel using TFTs. FIG. 2A is a partial plan view and FIG. 2B is an enlarged sectional view taken along line bb of FIG.

In the figure, reference numerals 1 and 2 denote glass substrates, and one glass substrate 1 has an entire surface common electrode 3 and an alignment film 4.
And are provided. Signal lines and scanning lines are arranged in a matrix on the other glass substrate 2, and T is formed at the intersections thereof.
The FT element and the pixel electrode 7 are connected. Gate electrode 6, drain electrode 5, source electrode 1 which constitutes a TFT element
0 is connected to the scanning line, the signal line, and the pixel electrode 7, respectively. An alignment film 8 is provided on these.
Each pixel electrode 7 constitutes a pixel together with the counter electrode 3. The distance between the electrodes is several μm to 10 μm, and the liquid crystal 9 is enclosed between them.

To drive this liquid crystal display panel, a signal line and a scanning line are selected and a voltage is applied, and the pixel electrode 7 is formed through a TFT element arranged at the intersection of the selected signal line and scanning line. When a signal voltage is applied to, the arrangement of the liquid crystal between the pixel electrode 7 and the counter electrode 3 changes, and the transmittance of that portion changes. In this way, the liquid crystal display panel can be driven.

[0005]

In the conventional liquid crystal display panel described above, the rubbing process of the alignment film 8 of the glass substrate 2 is performed with respect to the sides of the substrate as shown in FIG. Rubbing was performed with a certain angle θ. However, the surface of the alignment film 8 has large irregularities due to signal lines, scanning lines, etc. When the rubbing process is performed at a certain angle with respect to the sides of the substrate, the signal lines and scanning lines are provided in parallel with the sides of the substrate. As shown in FIG. 3 (b), a portion that is not sufficiently rubbed occurs, and when the panel is formed, an alignment defect such as a domain occurs, which causes unevenness in display and lowers contrast. It was

The present invention intends to realize a liquid crystal display panel in which a portion which is not subjected to rubbing treatment is prevented from occurring and a deterioration in display characteristics due to a domain or the like is suppressed.

[0007]

In the liquid crystal display panel of the present invention, a glass in which a non-linear element is arranged in each pixel of the two glass substrates 20 and 21 constituting the active matrix type liquid crystal display panel. The alignment film provided on the substrate 20 is characterized by being rubbed in a direction parallel to one of the signal lines and the scanning lines 22 and 23 arranged in a matrix on the glass substrate 20. And In addition to that, the liquid crystal display panel is used for a projection type liquid crystal display. By adopting this configuration, a liquid crystal display panel having no portion not subjected to rubbing treatment can be obtained.

[0008]

According to the present invention, since the rubbing process is performed in the direction parallel to the signal line or the scanning line which causes the unevenness, the conventional rubbing process is affected by both the signal line and the scanning line. Since it can be reduced to one or the other, the portion that the rubbing process does not reach is reduced. As a result, it is possible to suppress deterioration of display characteristics due to defective orientation of domains and the like.

[0009]

FIG. 1 is an exploded perspective view for explaining a liquid crystal display panel of the present invention. In the figure, 20 and 21 are transparent glass substrates. And one glass substrate 20
Include signal lines and scanning lines 22 arranged in a matrix.
23 and a pixel including a TFT (not shown) (for example, 3.2.
For projection type LCD of inch, 640 x 400 dots) is provided and an alignment film made of polyimide resin or the like is provided on it. The signal line 22 is formed on the alignment film.
The rubbing process is applied in the direction parallel to the.

On the other glass substrate 21, a common electrode (opposite electrode) is provided on the entire surface, an alignment film made of polyimide or the like is provided thereon, and the alignment film is also subjected to rubbing treatment. These two glass substrates 20, 21
Is a spacer (diameter of 5 μm) with the alignment films facing each other.
The liquid crystal display panel is configured by stacking the two with the liquid crystal sandwiched therebetween, sealing the periphery with an epoxy adhesive, and injecting liquid crystal into the interior.

Since the rubbing process is performed in the direction parallel to the signal line or the scanning line which is the cause of the unevenness of the alignment film in this embodiment having the above-mentioned structure, there are portions where the rubbing process cannot reach. It is possible to suppress the deterioration of display characteristics due to the domain.

[0012]

According to the present invention, the substrate on which the non-linear element of each pixel is arranged is subjected to rubbing treatment in the direction parallel to the signal line or the scanning line, thereby reducing the portion that the rubbing treatment does not reach. , The deterioration of the display characteristics due to domains and the like can be suppressed, and in particular, the effect is great by using the projection type liquid crystal display in which the viewing angle characteristics need not be considered so much.

[Brief description of drawings]

FIG. 1 is an exploded perspective view for explaining an embodiment of a liquid crystal display panel of the present invention.

2A and 2B are views showing a conventional active matrix type liquid crystal display panel, in which FIG. 2A is a partial plan view and FIG. 2B is b in FIG.
It is a sectional view taken along the line -b.

FIG. 3 is a diagram for explaining a problem to be solved by the invention.

[Explanation of symbols]

 20, 21 ... Glass substrate 22, 23 ... Signal line, scanning line

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Seiji Tanuma 1015 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited (72) Inventor Morishige, 1015, Kamedotachu, Nakahara-ku, Kawasaki City, Kanagawa Prefecture, Fujitsu Limited

Claims (2)

[Claims] 1. A glass substrate (20) in which a non-linear element is arranged in each pixel among two glass substrates (20, 21) constituting an active matrix type liquid crystal display panel.
The alignment film provided on the glass substrate (20) has signal lines and scanning lines (22, 23) arranged in a matrix.
A liquid crystal display panel, wherein a rubbing process is performed in a direction parallel to either one (22 or 23) of the above. 2. A liquid crystal display panel according to claim 1, which is used for a projection type liquid crystal display.