JPS60211421A - Formation of oriented liquid crystal film - Google Patents

Abstract

PURPOSE:To change partially visual angle and to widen the visual angle over the entire part by using a photoresist film to execute a partial orientation treatment at >=2 points on the same plane thereby forming >=2 kinds of light-distributing liquid crystal films which are different in the orienting direction. CONSTITUTION:A patterned transparent conductive film (ITO)5, a polyimide film 6 and a photoresist layer 7 are laminated on a glass substrate 4. A patterned window 8 is provided to the layer 7 and only the part of the window 8 is oriented in the direction of an arrow CC'. The layer 7 is then stripped. A photoresist layer is formed on the layer 6 and a window is provided in the place not shown in the window, separate from the part of the window 8. The part of said window is subjected to the orientation treatment in the direction different from the arrow CC' and 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 increased.

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. Among them, displays using liquid crystals The advances in devices are 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.However, conventionally, the direction of liquid crystal alignment within the same panel has been However, due to the panel structure, one direction is sufficient; for example, aligning any part of the same liquid crystal display panel so that it has viewing angles in two or more different directions is a problem with the conventional liquid crystal display panel structure. It was not suggested at all, nor was it needed.

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 a liquid crystal alignment film layer consisting of. In order for this polyimide film 3 to have a liquid crystal alignment function, it is sufficient to rub the film a certain number of times with a cloth such as nylon in a certain direction, for example, in the direction BB/ in FIG.

However, orientation 3 ζ that has been conventionally subjected to this orientation treatment
.

Covering the film with something or rubbing it in a different direction is thought to cause the alignment film of the liquid crystal to deteriorate, so it is necessary to align only an arbitrary part in a different direction. It was a great idea to think about it.

Purpose of the Invention The present invention develops and implements a method that has not been thought of in the past, and involves forming liquid crystal alignment films having different viewing angles in at least two portions within the same liquid crystal display panel. This is the purpose.

Structure of the Invention In order to achieve this object, the method for forming a liquid crystal alignment film of the present invention involves performing alignment treatment partially on at least two locations on the same plane using a mask made of a photoresist layer. A liquid crystal alignment film having more than one different liquid crystal alignment direction is formed.

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

First, a photoresist layer was formed on the same plane of a liquid crystal display panel by spinner coating, and patterned by exposure and development. FIG. 3 is a perspective view of a liquid crystal alignment film including a photoresist layer formed by the method described above, showing a 4-layer glass substrate, a 6-layer glass substrate, and a 6-layer glass substrate.
The patterned ITO 16 is a polyimide film, 7 is a photoresist layer, and 8 is a window formed by patterning the photoresist layer 7. At this time, the photoresist used was, for example, a positive resist manufactured by Tokyo Ohka, OFP.
R&, 2 (45 cp) and a film thickness of about 2.5 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.

Next, a photoresist layer was formed by spinner coating on the polyimide film 6 that had been subjected to the orientation treatment again, a window was opened in a different part from the previous one, and the orientation treatment was performed in a direction different from the cc' direction. FIG. 4 is a top view showing the liquid crystal alignment direction of the liquid crystal alignment film formed in this way, where the arrow DD' is the partial liquid crystal alignment direction caused by the initial alignment treatment, and the arrow EE' is the 2 degree 6 in .

This is a partial liquid crystal alignment direction caused by the eye alignment process.

By performing the alignment treatment using the above method, it became possible to form liquid crystal alignment films having viewing angles in different directions in at least two portions on the same half surface.

In addition, a liquid crystal display panel having a liquid crystal alignment film formed by this method can be used in an environment of 66°C and 96% R and H.
Experiments have confirmed that the panel is extremely reliable, with no alignment film deterioration even after being left for 1,000 hours, and a contrast of 20 or more.

In addition, in the present invention, partial alignment treatment is performed at three or more locations,
It is also conceivable that the liquid crystal be formed to have at least two different liquid crystal alignment directions.

Effects of the Invention As is clear from the above explanation, according to the present invention, it is possible to partially form liquid crystal alignment films having two or more different liquid crystal alignment directions in at least two portions within the same plane. Therefore, it is possible to partially change the viewing angle within one liquid crystal display panel to widen the overall viewing angle of 6 pages, and to further improve the contrast, which is of great industrial value.

[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 sectional view taken along the line A' in FIG. 1, and FIG. A perspective view of the liquid crystal alignment film at the time when the resist layer is formed and patterned,
FIG. 4 is a diagram showing the orientation direction of a liquid crystal alignment film formed 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.

Claims (1)

[Claims] 1. A method for forming a liquid crystal alignment film, comprising partially forming the same liquid crystal alignment film using a mask made of a photoresist layer.