JPS6378128A - Liquid crystal display panel - Google Patents

Abstract

PURPOSE:To obtain the titled panel capable of forming simply a uniform film, even in case of forming the oversized titled panel by sticking a sheet-like org. high polymer coating film mixed a spacer therein, to a substrate as an orientation film. CONSTITUTION:The substrates 23 and 24 stuck upper and lower electrodes respectively are obtd. by forming electrode groups which are divided into each long narrow strips on the surfaces of a pair of transparent substrates which contacts with the liquid crystal, respectively. And, the solution which is composed of polyimide capable of cross-linking at a low temp., and is mixed with cross-linked polystyrene spacer powders, is coated on a polyethylene terephthalate, followed by forming a film in a semi-cured state. The obtd. sheet is stuck to for example, the substrate 23 stuck the upper electrode thereon by means of a laminator. Similarly, the orientation film 25 is formed on the substrate 24 stuck the lower electrode thereon. Subsequently, the substrates are stuck so as to be faced the electrodes with each other, followed by filling a liquid crystal composition 27 in a space formed between the orientation films 25 by the spacer. The linearly polarizing plates 21 and 22 are stuck on the outsides of both substrates respectively. The sheet-like org. high polymer coating film mixed the spacer is stuck to the titled panel followed by forming to the orientation film and spacer. Thus, the uniform titled panel having high quality, is obtd. without contaminating the surface of the orientation film.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a large liquid crystal display panel with high performance and high yield.

BACKGROUND OF THE INVENTION In recent years, liquid crystal display devices have been actively approached for large-capacity displays, particularly image displays, and are attracting attention as displays that can be used to realize low-cost devices. An example of the conventional liquid crystal display device mentioned above will be described below with reference to the drawings.

FIGS. 2 and 3 are diagrams showing the structure of a matrix type liquid crystal display device, which is an example of a conventional liquid crystal display device.

After forming an electrode group 3.4 divided into strips and an alignment film 5 on the surfaces of a pair of transparent substrates 1.2 that are in contact with the liquid crystal, glass fibers or fine resin particles are scattered, spacers 6 are provided, and electrodes 3.4 are formed. The liquid crystal composition 7 is filled in the gap formed by the spacer, and a linear polarizing plate 8.9 is bonded to the outside of both substrates. In the liquid crystal display device configured as described above, each intersection of each divided electrode group 3.4 forms a picture element 10, and by selectively applying a voltage to these electrode groups, an arbitrary Information can be displayed.

Problems to be Solved by the Invention As liquid crystal display panels become larger, it has become extremely difficult to form a uniform alignment film or to control the gap between the panels. In the case of dispersing spacers to control a predetermined gap as in the conventional method, a step of dispersing the spacers is included after the surface of the alignment film is rubbed, so that the rubbed surface of the alignment film is likely to be contaminated or damaged. In addition, not only does the number of steps for manufacturing LCD panels increase, but equipment and jigs are required to uniformly disperse the spacers, which increases yield and costs in order to obtain high-quality LCD panels that look good. Not only was this a problem, but it was also causing a significant deterioration in work efficiency.

Therefore, the present invention makes it possible to easily form a uniform film even when the size of the liquid crystal display panel increases or even when the panel size differs.Moreover, the gap between the panels can be controlled to a predetermined thickness, and a uniform and even high-quality film can be formed. This makes it possible to easily obtain a liquid crystal display panel.

Means for Solving the Problems In order to solve the above problems, the liquid crystal display panel of the present invention has the following features:
A sheet-like organic polymer film mixed with a spacer is adhesively formed to serve as an alignment film and a spacer.

Effects The present invention has the above-described structure, so even if the liquid crystal display panel becomes larger, it is possible to easily form a uniform film, without contaminating or damaging the surface of the alignment film, and with less damage than before. The process produces high-quality liquid crystal display panels with a uniform panel gap and no unevenness, and even for liquid crystal display panels of different sizes, alignment films of any size can be formed by simply cutting the sheet, improving yields. , it is possible to not only reduce costs but also significantly improve work efficiency.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

In Figure 1, 21.22 are upper and lower polarizing plates, 23.24
25 is a substrate with upper and lower electrodes, 25 is an alignment film, 26 is a spacer, 27 is a liquid crystal composition, and 28 is a reflective plate, and electrode groups divided into strips are formed on the surfaces of the pair of transparent substrates that are in contact with the liquid crystal. The substrates 23 and 24 are provided with upper and lower electrodes.

Next, a low-temperature cross-linked polyimide solution containing granular cross-linked polystyrene spacers is applied onto polyethylene terephthalate (PBT) using a blade method, semi-cured to obtain a sheet, and then applied to the substrate 23 with the upper electrode using a laminator, for example. paste. Similarly, the same alignment film sheet without a spacer is attached to the lower electrode-attached substrate 24, and the PET is peeled off and heat treated to form an alignment film 25. Thereafter, the electrode surfaces of the substrates are bonded to face each other, the gap formed by the spacer is filled with liquid crystal composition 27, and linear polarizing plates 21 and 27 are placed on the outside of both substrates.
Paste together. Further, when the liquid crystal display panel has a reflective structure, a reflective plate 28 is provided outside the lower polarizing plate 22. The substrates 23 and 24 with upper and lower electrodes have electrodes formed on opposing surfaces, and the surface of the alignment film is subjected to a predetermined alignment treatment.

Effects of the Invention As described above, the present invention enables uniform film formation even when the size of the liquid crystal display panel becomes large, and can be applied even when the size of the liquid crystal display panel is different, by adhering a sheet-like polymer film containing a spacer as an alignment film. Even for liquid crystal display panels, alignment films of any size can now be formed by simply cutting the sheet. In addition, the process of dispersing the spacer that was performed after forming the alignment film can be omitted, and the alignment film surface is not contaminated or damaged, and it can be done with fewer steps than before.
It is possible to obtain a high-quality liquid crystal display panel that is uniform and free from unevenness, and since it does not require any equipment or jigs to evenly distribute the spacers, even liquid crystal display panels of different sizes can be produced without display unevenness using the same equipment. Not only was a high-quality liquid crystal display panel free from defects such as defects obtained at a high yield and low cost, but it also greatly contributed to improving work efficiency, and the practical effects were extremely large.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a liquid crystal display panel according to an embodiment of the present invention.
FIGS. 2 and 3 are configuration diagrams of conventional liquid crystal display panels. 21... Upper deflection plate, 22... Lower deflection plate, 23... Upper electrode-attached substrate, 24...
... Substrate with lower electrode, 25 ... Polymer alignment film, 26 ... Spacer, 27 ... Liquid crystal composition, 28 ... Reflection plate. Name of agent: Patent attorney Toshio Nakao One idiot? I-Upper polarization range? ? -Lower polarized forest? 3 - Two main parts with electrodes 24 - One lower electrode with an aim 25 - High part orientation? 6-Spacer? 7--- Liquid product Qi and Banjo Hikigu? 8- Reflection Filial Girl Figure 1

Claims (1)

[Claims] A pair of substrates with electrodes, at least one of which is transparent, are arranged so that their electrode surfaces face each other, a spacer of a predetermined diameter is used to maintain a gap between the substrates, the periphery is sealed with an adhesive, and then This is a liquid crystal display panel formed by filling this gap with a liquid crystal composition, and is characterized in that a sheet-like organic polymer film containing a spacer is adhesively formed on the alignment film that regulates the arrangement of liquid crystal molecules. panel.