JPS61138231A - Orientation treating method of liquid-crystal display element - Google Patents

Abstract

PURPOSE:To orient uniformly a liquid-crystal display element regardless of the size of an electrode substrate without contaminating the electrode substrate by injecting fluid to a high polymer resin film with which the electrode substrate is coated at a specific angle under high pressure, and forming a fine grooved uneven surface on the high polymer resin film. CONSTITUTION:An injection nozzle 2 in a thin and long tube shape is arranged above a belt conveyor A in the breadthwise direction of the belt conveyor A. Many injection ports 2a... are formed at one side part of the injection nozzle 2 in its lengthwise direction and the liquid is injected to the electrode substrate 1 which is conveyed as shown by an arrow under high pressure slantingly above. In this case, the angle of the injection is about 30 deg. to the surface of the electrode substrate 1 and the liquid injected from the injection nozzle 2 uses a solvent having a low boiling point such as freon. Consequently, the fine grooved uneven surface is formed on the high polymer resin film 3 on the electrode substrate 1.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to an alignment treatment method for a liquid crystal display element.

[Prior art]

Conventionally, a rubbing method and an oblique evaporation method are known as processing methods for aligning liquid crystal molecules in a predetermined direction with respect to the surface of an electrode substrate. In this case, the rubbing method is a method in which the surface of the electrode substrate is rubbed in one direction with cotton to form fine grooves, and the oblique evaporation method is a method in which silicon oxide ( In this method, SiO) or the like is vapor-deposited to form an array of diagonally aligned silicon molecules on the surface of the substrate.

[Problems with conventional technology]

However, according to the above-mentioned rubbing method, there is a risk that cotton fibers may adhere to the electrode substrate and cause alignment defects. Also,
According to the oblique evaporation method, in addition to being expensive, it is not possible to uniformly evaporate the entire surface of a large substrate because the evaporation is performed from a fixed position, and the alignment direction may shift due to deviations in the evaporation direction. There were drawbacks.

[Purpose of the invention]

This invention was made against the background of the above-mentioned circumstances, and its purpose is to avoid contaminating the electrode substrate during the alignment process and to enable uniform alignment regardless of the size of the electrode substrate. An object of the present invention is to provide a method for aligning a liquid crystal display element.

[Key points of the invention]

In order to achieve the above-mentioned object, this invention sprays a fluid at high pressure at a predetermined angle onto a polymer resin film coated on an electrode substrate to form a fine groove-like uneven surface on the polymer resin film. The main points are the main points.

〔Example〕

Hereinafter, the present invention will be specifically described based on an embodiment shown in the drawings. Figure 1 is an external perspective view of the alignment processing section. In the process of manufacturing a liquid crystal cell, after the process of coating the surface of the electrode substrate with a polymer resin (limide, silane, etc.), the process shown in Figure 1. As shown, an electrode substrate 1 supported and fixed on a belt conveyor A is conveyed to an alignment processing section.

This orientation processing section consists of an elongated, tubular injection nozzle 2 arranged above the belt conveyor person along the width direction of the belt conveyor person. In order to spray from diagonally above the surface of the electrode substrate 1 (the surface of the polymer resin film 3), one side of the spray nozzle 2 has a large number of spray ports 2a along its longitudinal direction. formed. In this case,
The spray nozzle 2 sprays liquid onto the electrode substrate 1, which is conveyed by a belt comparer in the direction of the arrow (to the left in the figure), from diagonally above, facing the direction of conveyance of the electrode substrate 1. In this case, in this embodiment, the injection angle of the liquid crystal is set to be approximately 30 degrees with respect to the surface of the electrode substrate 1, as shown in FIG. 11112. Further, the liquid discharged from the injection nozzle 2 uses a low boiling point solvent such as 7 Leon.

After coating the surface of the electrode substrate 1 with the polymer resin film 3 in this manner, an alignment process is performed, and this alignment process is performed by jetting a liquid at high pressure. As a result,
It is possible to easily form a fine groove-like uneven surface on the polymer resin M3 on the electrode substrate 1, and since the dirt can be washed away with the liquid, there is no alignment defect caused by the dirt etc., and the electrode Regardless of the size of the substrate 1, uniform alignment processing can be performed on the entire electrode substrate.

Next, the alignment processing system according to this embodiment will be explained with reference to FIG. fIIIi3. In the orientation treatment tank B,
The liquid ejected from the injection nozzle 2 is transferred to the alignment treatment tank B.
It flows into the paper drying tank 0 which is continuous with the orientation treatment tank B through the bottom slope of the paper drying tank 0, and is stored at the bottom of the paper drying tank 0. Further, when the liquid adhering to the belt conveyor and the electrode substrate 1 is sent from the orientation processing tank B to the paper drying tank 0, it is heated by a heater D arranged below the belt conveyor A.

In this case, the liquid is a low boiling point liquid such as Freon, so when it is heated, it vaporizes in the area and fills the paper drying tank C. It is condensed in the cooling pipe B and stored at the bottom of the paper drying tank C. The liquid accumulated at the bottom of the paper drying tank C in this way is led out from the drain r, subjected to a process of separating moisture and then a process of filtration with a filter, and then compressed by a compressor and sent to the injection nozzle 2. It may also be released. Note that the electrode substrate 1 that has passed through the paper drying tank 0 is sent to the next process on a belt conveyor.

As the electrode substrate 1 passes through the paper drying tank 0 on the conveyor belt in this manner, the liquid on the electrode substrate 1 is vaporized, so that clean, clean, aligned electrode substrates are continuously obtained. It will be done. Further, in the above system, the liquid is circulated and reused, so it is economical.

In the above embodiment, only the liquid was injected to perform the alignment process, but gas may also be injected, or fine particles such as alumina may be mixed with the liquid and injected. , even more effective alignment treatment becomes possible. In addition, within the scope of this invention,
Various modifications and applications are possible.

〔Effect of the invention〕

As explained in detail above, this invention sprays fluid at high pressure at a predetermined angle onto the polymer resin film coated on the electrode substrate, so that the polymer resin film has fine groove-like uneven surfaces. In addition, since dirt and grime can be washed away with fluid, there is no orientation defect due to dust, etc., and regardless of the size of the electrode substrate,
Uniform alignment treatment can be performed over the entire electrode substrate. Furthermore,
It is also advantageous in terms of cost, as it is suitable for mass production through continuous processing.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is an external perspective view of an alignment processing section, FIG. 2 is a side view thereof, and FIG. 3 is a diagram for explaining an alignment processing system. 1... Electrode substrate, 2... Injection nozzle,
3...Polymer resin film. Patent applicant Casio Computer Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] After coating the surface of the electrode substrate with a polymer resin film,
In order to orient the liquid crystal molecules in a predetermined direction, a fluid was jetted at a high pressure at a predetermined angle from an injection nozzle to the polymer resin film on the electrode substrate to form a fine groove-like uneven surface on the polymer resin film. A method for aligning a liquid crystal display element, characterized in that: