JPS6173129A - Manufacture of liquid crystal display element - Google Patents

Abstract

PURPOSE:To prevent troubles, such as peeling of a surrounding sealing material or disconnection of transparent electrodes, by applying a polarizing plate or a reflecting plate after forming a liquid crystal display cell, and then, injecting the liquid crystals and sealing the cell. CONSTITUTION:Orientation films are formed on two electrode base plates pre pared by vapor depositing ITO on polyether sulfone films by sputtering and subjecting it to orientation treatment. The orientation films subjected to the rubbing treatments are laid almost in parallel and opposite to each other in the rubbing directions crossing each other at right angles, and the surrounding sealing material and 'Micropearl(R)' spacers are interposed between both bases to form the liquid crystal cell. The polarizing plates available in the market coated with adhesives are applied to both bases with a laminator, the cell and the liquid crystals are placed in a vacuum apparatus, its inside is evacuated, then, gaseous N2 is introduced into it, the liquid crystals are injected, and the injection opening is sealed with a urethane adhesive to obtain the liquid crystal display element. The pressure in the inside of the cell is not raised even by applying a pressure from the laminator to the cell, and the cell can be prevented from deformation to a large extent.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a liquid crystal display element, and particularly to a method for manufacturing a liquid crystal display element using a plastic film as a transparent electrode substrate.

[Conventional +i! 1'] In conventional liquid crystal display elements, a rigid glass plate or a transparent electrode plate is used, so a polarizing plate or one-sided # After pasting roots (scattering plates), etc., and injecting liquid crystal into the 1M element to seal it and integrate it into the 1M element, cell deformation is small even when pressure is applied to the cell, such as with a laminator. These polarized light treatment 1 reflecting plates could be easily attached without any defects.

On the other hand, liquid crystal display elements using plastic films as transparent electrode substrates have recently come into use, and the same method of attachment as for glass elements has been adopted.

[Problems to be solved by the invention] The conventional 5iI manufacturing method for liquid crystal display elements requires injection of liquid crystal once a month.
Previously, force removal was used to attach a polarizing plate or a reflective plate after the laminator, so when manufacturing display elements using a non-rigid transparent FL polar substrate such as a plastic film, the cell Since a is large and "L is already hermetically sealed", a large force is locally applied to the first peripheral sealing part, which may cause failure of the roll or local elongation of the film, causing damage to transparent electrodes such as ITO. It had the disadvantage that disconnection defects were likely to occur.

[Efforts to Solve the Problems] The present invention has been made to solve the above-mentioned problems when manufacturing a liquid crystal display using a plastic film as a substrate. 1 Peripheral seal 1111 due to the manufacturing method of injecting and sealing liquid crystal into this cell after pasting a polarizing plate or a reflecting plate after formation.
It is possible to obtain good results without occurrence of defects such as 1'A' or disconnection of transparent electrodes.

The first sentence is a front view schematically showing a state in which a polarizing plate with an adhesive according to the present invention is attached to a 1M product cell using a laminator. (1) is the rotating roller of the laminator, (2) is the table where the liquid crystal cell is set,
(3) is a liquid crystal cell, and (4) is a polarizing plate. Figure 2 is a front view schematically showing the deformation of a liquid crystal 1 display cell, which is a conventional example in which pasting a polarizing plate is sometimes carried out. Reduce the large bulge on the left side to l/.

No. 31'4 shows the top view of the product cell at #, (+1)+
A transparent electrode substrate made of plastic film (12
) indicates a peripheral sealant, (+3) indicates a conductive transfer for conductive connection between the electrodes of the upper and lower substrates, and (I4) indicates a liquid crystal injection port.

As shown in FIG. 1, in the method according to the present invention, the liquid crystal inlet of the liquid crystal display cell is filled with air'! F. Because it is not sealed, even if pressure from the laminator is applied, the pressure inside the cell does not increase, and the deformation of the cell is kept small.

On the other hand: As shown in the fS2 diagram, in the conventional method, the cell pressure becomes Due to the effect of a kind of "strain" caused by the pressure curve inside the cell, the pressure curve inside the cell becomes curved (D). Air bubbles tend to remain in between.

The drawback is that the range of conditions is narrow.

[Example] Example 100gmfi polyether sulfone film was coated with ITO) i! After that, an alignment film was formed on the two patterned electrode substrates by etching. After rubbing the alignment film, the two substrates were arranged almost in a straight line with a peripheral sealant and a "Micropearl" spacer in between so that the directions were perpendicular to each other to form a liquid crystal cell. Next, attach a commercially available polarizing plate with adhesive on both sides using the laminator shown in Figure i41. Next, put the cell and liquid crystal into the j'r empty device, and! (After reducing the pressure to empty, N and gas are introduced into the device, liquid crystal is injected by the capillary effect, and tE
The population was urethane bonded) 1 bank 1 was j'+ + l-, and it was made into a net. In this connection, the disconnection failure of 711 lines and ITO was 2 to 3%. Comparative Example A defect cell was formed in the same manner as the method described in Example. After that, without pasting the polarizing plate, inject the liquid crystal M
Next, when a polarizing plate was pasted using a polarizer and used as a display element, there were about 10% punctures in the surrounding sealant and about 10% disconnections in the ITO inside the cell. The generation of air bubbles is about! 5% occurred.

[Effects of the Invention] As described above, 1. Manufacturing of a liquid crystal display element according to the present invention 4'J 7
In J-;, because a polarizing plate or a reflecting plate was attached to the area where the liquid crystal was injected and sealed, there was less destruction of the liquid crystal, and the yield was increased by 1 degree.

In the example of AQ Ming, the process of pasting the polarizing plate one cell at a time was shown, but even if a large number of cells were formed on the same -XMj soil at 7g, the process would be the same.

[Brief explanation of the drawing]

Figure J1 is a top view showing a state in which a polarizing plate is attached by the method according to the present invention. FIG. 2 is a top view of the conventional method. FIG. 3 shows a positive side view of the liquid crystal cell. l Bi-rotating roller 2 N table 3, liquid crystal cell 4/polarizing plate No. 1 Fig. 2

Claims (1)

[Claims] (1) Two substrates on which transparent electrodes are formed are arranged almost parallel to each other on a plastic film with a spacer and peripheral sealant in between, and a polarizing plate or a reflecting plate is placed on the outer surface of both substrates. A method for manufacturing a liquid crystal display element to be pasted, characterized in that a polarizing plate is pasted in advance before liquid crystal is injected and sealed.