JPS60211422A - Formation of oriented liquid crystal film - Google Patents

Abstract

PURPOSE:To widen visual angle by masking the surface of a light-distributing liquid crystal film subjected to an orientation treatment in one direction with photoresist and subjecting partially the film in the orientation treatment in another direction thereby forming two kinds of the oriented films which are different in direction on the same plane. CONSTITUTION:A polyimide film 6 which is oriented in a specified direction is laminated on a transparent conductive film 5 patterned on a glass substrate 4. A photoresist layer 7 is formed thereon and a window 8 is provided. Only the part of the window 8 is oriented in the direction different from the specified direction, for example, in the direction of an arrow CC', then the photoresist layer is stripped. The visual angle is thus partially changed, by which the visual angle over the entire part is widened and the contrast is improved.

Description

Detailed Description of the Invention Field of the Invention The present invention relates to a method for forming a liquid crystal alignment film that can be used to form an alignment film that has partially different viewing angles within one liquid crystal display panel. It is.

Conventional configurations and their problems In recent years, the development of display devices used in video equipment, etc. has been very active, and remarkable progress has been made in various fields, but in particular, the progress of display devices using liquid crystals has been remarkable. There is something worth noting.

2 (〉' In other words, it has many advantages such as being thin and having very low power consumption, and liquid crystal display panels that take advantage of these advantages are being developed one after another. Due to the panel structure, one direction is sufficient; for example, alignment treatment is performed so that any part of the same liquid crystal display panel has viewing angles in two or more different directions.
This has not been proposed or required in any conventional liquid crystal display panel structure.

Hereinafter, a conventional method for forming a liquid crystal alignment film as described above will be described with reference to the drawings.

Figure 1 is a perspective view of a conventional liquid crystal alignment film, and Figure 2 is a cross-sectional view thereof, where 1 is a glass substrate, 2 is a patterned transparent conductive film (hereinafter referred to as ITO), and 3 is a polyimide film. This is an alignment film layer consisting of.

In order to make the polyimide film 3 have a liquid crystal alignment function, the film may be rubbed a certain number of times with a cloth such as nylon in a certain direction, for example, in the direction BB' in FIG.

However, conventionally, covering the alignment film with something or rubbing it in another direction is thought to cause the alignment film of the liquid crystal to deteriorate, and therefore any arbitrary It has not been considered to orient only parts in different directions.

OBJECTS OF THE INVENTION The present invention develops and implements a method that has not been considered in the past. The target is

Structure of the Invention In order to achieve this object, the method for forming a liquid crystal alignment film of the present invention is to partially re-align a liquid crystal alignment film on the same plane that has been subjected to alignment treatment in one direction using a mask made of a photoresist layer. An alignment treatment is performed to form a liquid crystal alignment film having 2s or more different liquid crystal alignment directions within the same plane.

Description of examples Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

First, an alignment film that was unidirectionally aligned was formed, and a photoresist layer was formed thereon by spin coating according to the method for forming a liquid crystal alignment film according to the present invention, and patterned by exposure and development. FIG. 3 is a perspective view of a liquid crystal alignment film including a photoresist layer formed by two methods, 4 is a glass substrate, 5 is a patterned ITO 16 is a polyimide film,
7 is a first resist layer; 8 is a window formed by patterning the photoresist layer 7; The photoresist used at this time was, for example, a positive resist manufactured by Tokyo Ohka Corporation, 0FPR Notification 2 (45CI)), and the film thickness was approximately 2.6 μm.
was formed. Then, only the portion of the window 8 formed in the photoresist layer 7 was subjected to alignment treatment in the CC' direction in FIG. 3, and then the photoresist layer 7 was peeled off. FIG. 4 is a top view showing the liquid crystal alignment direction of the liquid crystal alignment film thus formed, where arrow DD' is the liquid crystal alignment direction caused by the first alignment treatment, and arrow EE' is the liquid crystal alignment direction caused by the second alignment treatment. This is the resulting partial liquid crystal alignment direction.

As a result, it can be seen that when a polyimide film on one plane is subjected to alignment treatment by layering it many times, the alignment direction of the liquid crystal follows the final alignment direction of each part. It has now become possible to form a liquid crystal alignment film having viewing angles in at least two different directions.

In addition, a liquid crystal panel having a liquid crystal alignment film formed by this method can be used in an environment of (35'C, 95% R, l).
It was confirmed through experiments that the panel was extremely reliable, with no signs of alignment film deterioration even after being left for 1,000 hours, and a contrast of more than 20%.

Effects of the Invention As is clear from the above explanation, according to the present invention, it is possible to form liquid crystals in two or more different directions within the same plane, so that it is possible to form liquid crystals in two or more different directions within one liquid crystal display panel. It is of great industrial value because it is possible to increase the overall visual angle by changing the viewing angle, or to further improve the contrast.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an alignment film formed by a conventional forming method, Fig. 2 is a cross-sectional view taken along line A-A' in Fig. 1, and Fig. 3 is an implementation of the method for forming a liquid crystal alignment film of the present invention. A perspective view of a liquid crystal alignment film at the time when a photoresist layer is formed and patterned in an example,
FIG. 4 is a diagram showing the orientation direction of a multi-layered liquid crystal alignment film according to an embodiment of the present invention. 4...Glass substrate, 6...Transparent conductive film (ITO), 6...Polyimide film, 7...
- Photoresist layer, 8... Window formed in the photoresist layer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 4
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Claims (1)

[Claims] On the liquid crystal alignment film on the same plane that has been aligned in one direction,
A method for forming a liquid crystal alignment film, which comprises performing a partial alignment treatment using a photoresist layer mask to form a liquid crystal alignment film having two or more different liquid crystal alignment directions in the same plane.