JPS63104022A - Production of liquid crystal display device - Google Patents

Abstract

PURPOSE:To obtain a liquid crystal display device which is uniform in display appearance and does not generate low-temp. bubbles even after resting at a low temp. by fixing and installing hard inorg. material spacers in an oriented film, then installing soft org. material spacers on the oriented film. CONSTITUTION:A transparent electrode 2 is formed to a prescribed shape on a glass substrate 1 and an orientation treating liquid added with glass fibers as the inorg. material spacers 4 is printed on the transparent electrode 2. The oriented film 3 is then subjected to a heat treatment to fix and install the glass fibers in the oriented film 3. The film is subjected to an orientation treatment by rubbing. Polystyrene resin balls dispersed in a volatile solvent are sprayed as the org. material spacers 5 onto the substrate 1 and are installed thereon. The glass fibers as the inorg. material spacers 5 are fixed and installed into the oriented film and the polystyrene resin balls as the org. material spacers 5 are installed on the oriented film 3 by such operation. Then, the hard inorg. material spacers 4 act to uniformize the thickness of the liquid crystal cell and the soft org. material spacers 5 act to prevent the low-temp. bubbling.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a liquid crystal display device, and particularly to uniformity of liquid crystal cell thickness.

[Conventional technology]

Conventionally, the method for achieving uniformity of liquid crystal cell thickness was developed in 1983.
9-28445, uniform glass fibers or polystyrene resin balls having a predetermined diameter are dispersed in a volatile solvent as a spacer, and then the glass fibers or polystyrene resin balls are sprayed onto the entire surface of the liquid crystal cell substrate. / system resin balls were evenly placed on the substrate.

[Problem that the invention seeks to solve]

However, in the above-mentioned conventional technology, when a glass fiber cage having a predetermined diameter is used as a spacer, the thickness of the liquid crystal cell can be made uniform, so that the display appearance of the liquid crystal display device can be made completely uniform. When left in a low temperature of 20°C or lower, the liquid crystal filled in the liquid crystal cell, the substrate that makes up the entire liquid crystal cell, and the glass fiber heat #3 tensile coefficient are significantly different, resulting in a vacuum called low-temperature bubbles. This had the disadvantage of producing poor display due to the generation of bubbles.

Also, use the specified diameter IF as a spacer! When polystyrene-based resin balls are used, it is difficult to achieve uniformity of liquid crystal cell thickness due to the elastic properties of the resin balls, and especially when manufacturing large-sized liquid crystal display devices, the display appearance becomes non-uniform and the display There was a defect that made it defective.

Therefore, the present invention is intended to solve these problems, and its purpose is to provide a liquid crystal display device with excellent display quality.
It's there to provide.

[Means for solving problems]

The liquid crystal display device of the present invention is a liquid crystal display device in which a pair of substrates having a transparent electrode on the inner surface and an alignment film entirely on the electrode are placed facing each other with a spacer interposed therebetween, and a liquid crystal light is filled between the substrates. Either at least an inorganic material spacer and a stone iso material spacer are used as spacers, and the spacer is fixedly installed in the alignment film, or after the inorganic material spacer is fixedly installed in the alignment film, the inorganic material spacer is It is characterized in that it is installed on the alignment film by spraying.

[For production]

According to the above structure of the present invention, by balancing the installation density of the inorganic material spacer and the shoulder material spacer, the hard inorganic material spacer has the effect of making the thickness of the liquid crystal cell uniform;
The soft organic material spacer has a function of preventing low-temperature bubbles. In this case, it is necessary that at least the inorganic material spacer moves in the liquid crystal cell and is immobilized in the alignment film so that the installation density does not increase locally. Otherwise, the portions where the installation density is extremely high will not be able to follow the contraction of the liquid crystal at low temperatures, and low-temperature bubbles will occur in these portions.

This will be explained in detail below using examples.

[Example 1] FIG. 1 is an embodiment showing a complete process outline of the present invention. After forming a transparent electrode 2't in a predetermined shape on a glass substrate 1 (FIG. 1(a)), the transparent electrode is printed by full-flekin printing with an alignment treatment solution to which all glass fibers have been added as an inorganic material spacer 4 in advance. 2 and then heat-treated to fix the glass fibers in the alignment film 3 (FIG. 1(b)). Next, the substrate 1 is rubbed in one direction with a roller 10 wrapped entirely in cloth to perform an orientation treatment (FIG. 1(C)), and an organic material spacer 5 is placed on the substrate and dispersed in a volatile solvent. Made of polystyrene resin balls? It was installed by spraying from the nozzle 11 (FIG. 1(d)). Through the above operations, the glass fibers serving as the inorganic material spacers 4 were fixedly placed in the alignment film, and the polystyrene resin balls serving as the organic material spacers 5 were placed on the alignment film 3. Here, important points for achieving the object of the present invention are the installation density of the above-mentioned spacers of both materials and the control of the film thickness of the alignment film 3. The installation density of the glass fibers is set at 20 to 80/3 from the viewpoint of uniform cell thickness and balance of low-temperature bubbles.
It must be controlled to Wφ. In addition, the installation density of the polystyrene resin balls is 10% from the viewpoint of uniform cell thickness.
0~100011! You must control l/3 yoφ by 1 plus 1j. Furthermore, if the thickness of the alignment film 3 is thin, the spacer will not be fixed sufficiently and will come off during the rubbing process (FIG. 1(C)), and if it is thick, the display appearance will deteriorate.
Approximately 00X to 3000X is preferable.

The above board? When a liquid crystal display device as shown in FIG. 2(a) was manufactured using this as one of the substrates, the display appearance was uniform and no low-temperature bubbles were generated even when the liquid crystal display was left at temperatures below -20°C.

[Example 2] On one of the substrates, glass fibers were fixedly placed in the alignment film 6 in the same manner as in Example 1, and then polystyrene balls were placed on the alignment film. Example 1 was applied to the other substrate.
Similarly, glass fibers were fixedly installed in the alignment film 3. When the entire liquid crystal display device shown in FIG. 2 (1) was manufactured using both of the above-mentioned substrates, the same results as in Example 1 were obtained.

[Example 3] In the same manner as in Example 1, glass fibers as inorganic spacers 4 and polystyrene resin balls as organic spacers 5 were fixed and installed in alignment film 3 on both substrates at the same time. When a liquid crystal display device shown in FIG. 2(C) was fabricated using both of the above substrates, the same results as in Example 1 were obtained.

The above embodiments are only some embodiments of the present invention and are not intended to be limiting. For example, a liquid crystal display device may be manufactured by fixing glass fibers and polystyrene resin balls in the alignment film 6 on only one substrate. Furthermore, inorganic material spacers may include crow seeds, alumina particles, etc., and organic material spacers may include nylon balls, polyacetal resin balls, etc.

〔Effect of the invention〕

As described above, according to the present invention, as spacers for making the entire cell thickness uniform to a predetermined thickness, both a hard inorganic material spacer and a soft organic material spacer are fixedly installed in the entire alignment film, or A liquid crystal display device with a uniform display appearance and no low-temperature bubbles even when left at low temperatures by fixing a hard inorganic material spacer on the entire alignment film and then installing a soft organic material spacer on the entire alignment film. can be provided. It is particularly effective for preparing super TN type liquid crystal display devices in which the total twist angle of liquid crystal molecules is 180° or more.

[Brief explanation of the drawing]

FIGS. 1(a) to dJ are schematic diagrams showing the process of the present invention. FIGS. 2(a) to (C) are cross-sectional views of a liquid crystal display device according to the present invention. 1...Glass substrate 2... Transparent electrode 6...Alignment film 4...Inorganic material spacer 5...Organic material spacer 6...Seal material 7...Liquid crystal 10...Roller 11...Nozzle and above Applicant: Seiko Epson Corporation Company and 1 other person (aJ Figure 1

Claims (1)

[Claims] In a liquid crystal display device in which a pair of substrates having transparent electrodes on the inner surfaces and alignment films on the electrodes are disposed facing each other with spacers interposed therebetween, and liquid crystal is filled between the substrates, the spacers include at least an inorganic material spacer and an organic material spacer. Using,
A liquid crystal display characterized in that the spacer is fixedly installed in the alignment film, or after the inorganic material spacer is fixedly installed in the alignment film, the organic material spacer is installed on the alignment film by spraying. Method of manufacturing the device.