JPH03192321A - Manufacturing method of liquid crystal display panel - Google Patents

Abstract

PURPOSE:To allow the uniform working over the entire surface of the large- sized display panel with high accuracy by executing the working of electrodes, the applying and orientation rubbing of oriented films and the injecting of a liquid crystal in the state of forming flexible plastic film layers on solid substrates. CONSTITUTION:The plastic film layers 12, 16 are respectively formed on two sheets of the solid substrates 11, 15 consisting of glass, stainless steel, aluminum, iron, brass, etc. The light transparent metal oxide electrodes 13, 17 are formed on the films. The applying of the oriented films 14, 18 by a spinner method or roll coater method and the orientation rubbing treatment of the coated films are executed in order to orient the liquid crystal molecules in a fixed direction over the entire surface of the display panel. The 1st substrate and 2nd substrate produced in such a manner are held at a specified spacing and the periphery of the substrates is sealed by an adhesive. The liquid crystal is injected from an injection port and after the injection port is sealed by the adhesive, the substrates 11, 15 are peeled. The liquid crystal display panel is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to the manufacture of liquid crystal display panels using large-area flexible substrates among liquid crystal display panels used as thin, lightweight, and low power consumption displays. It is about the method.

BACKGROUND OF THE INVENTION Conventionally, liquid crystal display panels often use glass, plastic films, etc. as substrates. FIG. 6 is a sectional view of a conventional liquid crystal display panel using a plastic film. As for the manufacturing process, the transparent metal oxide electrodes 63 and 6 are directly placed on the film substrates 61 and 62.
4. Form an alignment film 65°66, scatter spacers,
Lamination of these two plastic film substrates 61 and 62, sealing of the periphery with adhesive 67, injection of liquid crystal and sealing of the injection port, lamination of polarizing plates 69 and 70 and color filters, and electrodes on the IC chip and substrate. This was done during processes such as connection. These technical contents are published in "Electronic Materials February 1988 Issue P, 37-P, 44r Liquid Crystal Display Constituent Materials" and Nikkei Micro Devices 1987.
October issue P, 78-P, 98r "Black-and-white STN panel that completely changes the image of difficult-to-read LCDs." All of the manufacturing methods use the plastic film substrates 61 and 62 directly as substrates for display panels.

Problems to be solved by the invention Recent advances in the technology of liquid crystal display panels have been remarkable, with larger areas and
High definition has been achieved and progress has been made from black and white to color. When manufacturing a high-definition, large-area display panel that takes advantage of the light weight and thinness that are the characteristics of liquid crystal display panels on a flexible plastic film substrate 61.62, it is necessary to fabricate it on a plastic film substrate 61. When directly carried out in the above-mentioned process, the plastic film substrates 61 and 62 tend to bend, so 3.
It is difficult to maintain a constant shape in a dimensional sense, which makes it impossible to perform highly accurate processing such as processing on glass substrates, and it is also difficult to ensure alignment accuracy and automate the process. However, there has been a problem in that it is difficult to industrially achieve high-definition processing in microns uniformly over the entire surface of the panel.

In view of the above problems, the present invention aims to provide a method for manufacturing a liquid crystal display panel that allows high-definition processing.

Means for Solving the Problems In order to achieve the above object, the present invention comprises forming a flat transparent plastic film layer on a substrate, and forming a transparent metal oxide electrode on the plastic film layer. After that, a first laminated substrate was manufactured by applying an alignment film on the transparent metal oxide electrode and subjected to an alignment rubbing treatment, and a first laminated substrate was manufactured on another substrate by the same process as the first laminated substrate. and a second laminated substrate while maintaining a certain gap, and sealing the periphery of the two laminated substrates with adhesive except for the liquid crystal injection port, and injecting liquid crystal from the injection port,
This method is characterized in that after the injection port is sealed with an adhesive, the laminated substrate is peeled off from the base.

Each process can be actually carried out with a flexible plastic film layer formed on a solid substrate, so it can be used for electrode processing, alignment film coating and alignment rubbing, liquid crystal injection, alignment, IC chip and film substrate. Similar to the process for conventional glass substrates, such as connection of upper electrode terminals, uniform and high-definition processing can be performed on such a substrate over the entire surface of a large display panel.

EXAMPLE Hereinafter, one example of the present invention will be specifically shown and described in detail.

(Example 1) FIGS. 1 to 3 are perspective views illustrating the present invention. In the same figure, 11.15 is a solid base made of glass stainless steel, aluminum, iron, brass, etc., 12.16 is a plastic film layer, 13.17 is a transparent metal oxide electrode, and 14.18 is an alignment film. . 19 is a sealant for sealing the peripheral portion of the laminated substrate; 20 is a glass bead for maintaining a constant gap between the two substrates; and 21 is a liquid crystal injection port.

As the material for the plastic film layer 12.16, resins commonly known as polyimide, polyester, PET, PBS, etc. can be used. The plastic film layer 12.16 can be formed by a spinner method, a roll coater method, etc., and a film thickness of about 20 microns is convenient for work. Transparent metal oxide electrodes 13 and 17 are formed and processed on this film. The electrode film is formed using sputtering and electron beam methods.

This is possible with vacuum evaporation methods such as resistance heating method and ion beam method. For example, the main components of the material are 21nO3 and 5nO.
Z, Cd2SnO+, ZnO, etc. can be used. The film thickness and specific resistance vary depending on the size of the display panel and the required number of electrodes, but in this example, there were approximately 2,000 people and 2X10-4Ω/a.
It is m. Next, this electrode is processed with high precision using a YAG laser method or a photolithography method to form a striped electrode.

The size, line width, and line length of the implemented panel are approximately 200 mm.
m1IX800+am, 10 microns, 300m. Currently, the number of wires is about 10 wires/rtrn for high-definition panels, and it can be processed with the same high precision as glass substrates. Next, in order to orient the liquid crystal molecules in a fixed direction over the entire surface of the display panel, an alignment film 14 and 18 is applied using a spinner method or a roll coater method (film thickness is about 500 coats), and the coating film is subjected to an alignment rubbing treatment. . In the rubbing method, a nylon cloth wrapped around a roller is used to rotate and rub the surface of the alignment film. Glass beads having a size of approximately 5 to 6 microns were used to laminate the first and second substrates manufactured in this manner with a constant gap between them. Then, the periphery of the two laminated substrates except for the liquid crystal injection port is sealed with adhesive, liquid crystal is injected from the injection port, and after sealing the injection port with adhesive, the base 11.15 is peeled off. and use it as a liquid crystal display panel.

According to this embodiment, by performing processing on a flexible plastic film substrate using a holding substrate, highly accurate processing can be performed in the same manner as on a glass substrate.

(Embodiment 2) FIG. 4 is a perspective view illustrating a second embodiment. In this figure, the same parts as in FIGS. 1 to 3 are given the same numbers. After forming the polarizing plate 24 and color filter 22 on one substrate 15 and the polarizing plate 23 on the other substrate 11 in advance, they are manufactured in the same steps as in the first embodiment. Since the polarizing plates 23, 24 and the color filters 22 are laminated on the base 11, 15, they can be formed with high precision.

(Example 3) In order for a liquid crystal display panel to function as a display for displaying images and characters, it is necessary to input display signals from the outside. It is necessary to connect the electrode terminals of the chip.

FIG. 5 is a sectional view illustrating the third embodiment. In this figure, the same parts as in FIGS. 1 to 3 are given the same numbers. Here, 25 is an electrode terminal of the panel, 26 is an IC chip, and 27 is an electrode terminal of the IC chip. A state in which the electrode terminals 27 of the IC chip are directly connected to the electrode terminals 25 on the plastic film layer 12 (so-called chip-on-filter (COF) connection method) is shown.

The pitch of the electrode terminals 27 of the IC chip and the pitch of the electrode terminals 25 of the display panel are matched and overlapped, and the interfacial flux 28 is applied.
epoxy resin is applied, the temperature is raised, both terminals are thermally crimped, and then both terminals are hardened with epoxy resin. Alternatively, electrically conductive anisotropic particles may be interposed between both terminals, the terminals may be crimped together, and electrical connection may be made via the electrically conductive anisotropic particles.

Since the plastic film layer 12 is on the base 11, the pitch of the electrode terminals 27 of the IC chip and the pitch of the electrode terminals 25 of the display panel can be precisely aligned.

Effects of the Invention As described above, according to the present invention, even a large-area flexible plastic film substrate can be processed with the same high precision as a glass substrate by using a holding base. A thin, lightweight, and highly flexible liquid crystal display panel can be easily manufactured.

Also, like when the substrate is made of glass, there is no shape change during the process, so it is easy to save labor through mechanization and automation.
Therefore, in an industrial sense, it is also possible to reduce costs through mass production.

[Brief explanation of drawings]

1 to 3 are perspective views illustrating a part of the manufacturing process of the first embodiment of the present invention, and FIGS. 4 and 5 are sectional views illustrating the display panel. 11.15...Base, 12.16...
Plastic film layer, 13.17... Transparent gold oxide different electrode, 14゜8... Alignment film, 2... Color filter 23゜4... ·Polarizer.

Claims (3)

[Claims] (1) forming a flat transparent plastic film layer on a substrate, forming a transparent metal oxide electrode on the plastic film layer, and then applying an alignment film on the transparent metal oxide electrode; A first laminated substrate manufactured by alignment rubbing treatment and a second laminated substrate manufactured in the same process as the first laminated substrate on another substrate are laminated with a constant gap maintained, and a liquid crystal display is produced. 2 above except for the inlet part
A liquid crystal display panel characterized in that the periphery of a laminated substrate is sealed with adhesive, liquid crystal is injected from an injection port, and after the injection port is sealed with adhesive, the laminated substrate is peeled off from the base. Production method. (2) A polarizing plate is formed between the base and the first laminated substrate, and two layers of a color filter and a polarizing plate are further laminated between another base and the second laminated substrate. The method for manufacturing the liquid crystal display panel described above. (3) The method for manufacturing a liquid crystal display panel according to claim 1, wherein the driving display IC chip is connected to the electrode terminals of the first and second laminated substrates by a chip-on-filter method before the step of peeling off the display panel on the base. .