JP3308773B2 - Liquid crystal display panel substrate alignment method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for aligning liquid crystal molecules performed on a liquid crystal panel substrate used in a liquid crystal display device.

[0002]

2. Description of the Related Art Conventionally, as an orientation treatment of a liquid crystal display panel substrate, a rubbing method of rubbing a substrate or a substrate coated with various resin films with a cloth such as a cotton cloth, or an oblique method of obliquely depositing silicon oxide or the like on a substrate. Evaporation methods have been commonly used.

As another alignment treatment method, an organic / inorganic surface treating agent is coated on a liquid crystal panel substrate, and then gas is blown in one direction to form groove-like irregularities on the surface of the surface treating agent. (Japanese Patent Publication No. Sho 58-10) and a method of patterning a groove-like unevenness by a photo process of a photosensitive resin coating film (Japanese Patent Laid-Open No. 21142/1990).
No. 5) has been proposed as an alignment potential control method.

[0004] As another orientation treatment method, a rubbing method using a magnetic brush (Japanese Patent Publication No. 1-32963), a method using an oblique jet treatment of a jet water stream or the like (Japanese Patent Application Laid-Open No. 2-114232) and the like have been proposed. I have.

[0005]

However, in the case of rubbing with a cloth, a brush, a magnetic brush, or the like, the dust generated by the rubbing adheres firmly to the panel substrate, or a TFT driven panel having a TFT on the substrate has a static electricity. This causes a disadvantage that the device is destroyed due to the above-mentioned phenomenon, and the quality of the liquid crystal display is deteriorated.

Further, in the example of the oblique deposition method, there is a problem in that the deposition direction of the deposition substance is slightly different on the substrate, so that the liquid crystal molecules are not uniformly aligned.

In the method of forming a concavo-convex pattern on the surface of an alignment material, the problem of dust generation can be solved, but the pattern formation process is troublesome and causes an increase in cost.

Although the oblique treatment of the jet water flow is also advantageous for dust generation, non-uniformity occurs in the liquid crystal alignment direction and the pretilt angle due to the scattered water flow and fluctuations in the flow velocity, so that a satisfactory display quality can also be obtained. There was a disadvantage that there was no.

In view of the above circumstances, the present invention enhances the effect of eliminating static electricity from the substrate while reducing the generation of static electricity, while improving the effect of preventing and removing particles from re-adhering.
It is an object of the present invention to provide an alignment treatment method for a liquid crystal display panel substrate that enables uniform alignment.

[0010]

The structure of the present invention achieved to achieve the above object is as follows.

That is, the present invention provides a liquid crystal display panel substrate on which an alignment film is formed, wherein the substrate is immersed in a fluid and high-frequency vibration is applied to the fluid in a direction substantially parallel to the substrate surface. And an alignment treatment method for a liquid crystal display panel substrate, wherein the alignment treatment is performed on the alignment film .

According to the present invention , a liquid crystal molecule alignment effect is exhibited by generating a highly directional medium flow in a direction substantially parallel to the liquid crystal panel substrate surface.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As a fluid according to the present invention, for example, water, an organic liquid, a polymer fluid, or the like can be used. In particular, by using a high viscosity fluid, the orientation effect can be enhanced.

Further, it is preferable to disperse solid particles such as an electrolyte, a surfactant, metal fine particles and dielectric fine particles in the fluid. This promotes the removal of static electricity from the substrate and enhances the flow frictional force. Further, if a polar solvent is used for the fluid, there is a further advantage in terms of measures against static electricity.

[0015]

The present invention will be described in detail below with reference to examples.

[Embodiment ] The alignment treatment method of this embodiment will be described with reference to the schematic diagram of FIG.

A liquid crystal display panel substrate 10 with a TFT coated with an alignment film 9 is held perpendicular to the water surface in an immersion tank 8 filled with a fluid (water) 7 as shown in the figure. In this state, ultrasonic waves of 1.6 MHz are generated from the ultrasonic vibration device 11 attached to the bottom of the immersion tank 8, and the fluid 7 is vibrated in a direction substantially parallel to the main surface of the panel substrate 10. br />

After the panel substrate 10 was washed with water using a 40 KHz ultrasonic cleaner and dried, the surface of the substrate was observed. As a result, it was found that the particle residue was extremely small and the appearance was good.

Using the substrate 10 and a color filter substrate treated in exactly the same manner as the substrate 10, a liquid crystal display device was manufactured by a known general method.

As a result of evaluating the characteristics of the liquid crystal display device of the present embodiment, extremely good display characteristics were exhibited, and no TFT was destroyed by static electricity, and the yield was greatly improved.

The frequency applied to the fluid shown in this embodiment is an example, and in a practical situation, it can be appropriately set according to the type and viscosity of the fluid, the type of the alignment agent, and the like. .

[0022]

As described above, according to the present invention, it is possible to prevent particles from re-adhering to the liquid crystal display panel substrate,
In addition, a uniform molecular alignment treatment can be performed while enhancing the removal effect. Thus, a high-quality liquid crystal display device can be obtained with a high yield.

In addition, since a material such as a cloth or a brush, which is deteriorated or changed during the production process, is not used, labor for replacing these materials can be saved and equipment management can be easily performed. Becomes possible.

[Brief description of the drawings]

It is a schematic cross-sectional view of a liquid crystal display panel substrate processing apparatus according to the actual施例of the present invention; FIG.

[Description of Signs] 7 Fluid 8 Substrate Processing Container (Tank) 9 Alignment Agent Film (Alignment Film) 10 Liquid Crystal Display Panel Substrate 11 High Frequency Ultrasonic Vibration Apparatus

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02F 1/1337 G02F 1/13 101

Claims (1)

(57) [Claims] 1. A liquid crystal display panel substrate on which an alignment film is formed is immersed in a fluid, and high-frequency vibration is applied to the fluid in a direction substantially parallel to the surface of the substrate, whereby the alignment film is provided. A method for aligning a liquid crystal display panel substrate, comprising the step of: