JPS60237427A - Production of liquid crystal display element - Google Patents

Abstract

PURPOSE:To manufacture an element having no air voids in a liquid crystal cell by reserving preliminarily a liquid crystal in the surplus part of a glass substrate. CONSTITUTION:A U-shaped enclosure 16 is provided by printing to the surplus part 15 of the glass substrate 1 having a part 14 formed with a transparent electrode pattern and the part 15. The liquid crystal of the amt. in excess by 5-10% of the required amt. is injected into the part 14. The one substrate 14 is clamped onto an upper plate 19 of the jig and after the inside of a chamber 9 is evacuated to a vacuum, the glass substrate 1, 4 are superposed. The atm. pressure is restored in the chamber through a leak valve 13 and while load is kept exerted to the manufactured liquid crystal cell, the cell is heated to cure a sealant 2. A surplus part 7b is thereafter cut by a cutter and the liquid crystal display element 7a having no voids is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing a liquid crystal display element.

[Prior art]

A conventional method for manufacturing a liquid crystal display element will be explained based on FIG. First, in the (al process), a transparent electrode (for example, In2
A sealing agent 2 (epoxy resin, etc.) is printed by screen printing on the transparent electrode side of the glass substrate 1 on which a pattern (O3 or 5n02, etc.) is formed so as to provide a liquid crystal injection port 3. Then, (in the bl process, the other glass substrate 4 on which spherical spacers of 8 to 9 μm are placed, and the glass substrate 1 on which the sealant 2 is printed are superimposed. Next, the fcl
In the process, a weight 5 of 40 to 60 kg is placed in a hot air circulation furnace 6, and the sealant 2 is cured at 150° C. for about 2 hours. In this way, a liquid crystal self is formed. Furthermore, in the +dl process, this liquid crystal self is fixed to a chuck 8a provided at the tip of the cylinder 8, and when the inside of the chamber 9 is evacuated by the vacuum pump 10, the 8 to 9μ gap between the glass substrates of the liquid crystal self is also evacuated. .

At this time, the liquid crystal self is lowered by the cylinder 8 to the liquid crystal 12 contained in the liquid crystal saucer 11 and immersed therein. After that, the leak valve 13 is opened to return the inside of the chamber 9 to atmospheric pressure. Then, due to the pressure difference between the inside of the liquid crystal cell and the inside of the chamber 9, the liquid crystal 12 is filled into the liquid crystal cell through the liquid crystal injection port 3.

In such a manufacturing process, for example, 150mm x 300m
In the case of an i-sized liquid crystal cell, it takes about 40 minutes to evacuate the gap between the glass substrates of 8 to 9 microns, and about 50 minutes because the filling speed is slow. Therefore, it takes about 5 hours from printing the sealant to filling the liquid crystal. There is also the problem that pressure equilibrium is reached incompletely after filling the liquid crystal, leaving air voids within the liquid crystal cell.

[Purpose of the invention]

In order to solve the above problems, the present invention aims to provide a manufacturing method that can fill liquid crystal at high speed and obtain a liquid crystal display element without air voids in the liquid crystal cell. .

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIG. 1. First, in the (al process), a transparent electrode (for example, In2
Q3 or S n 02, etc.) Pattern formed part 1
A sealant 2 (epoxy resin, etc.) is printed using a screen printer or the like on the transparent electrode side of the glass substrate 1 having the surplus portion 15 and the injection port 3 so as to form a U-shaped enclosure 16 around the injection port 3 and the surplus portion 15. . (In the BL step, the liquid crystal 12 of the required amount +5 to 10% is dropped by a dispenser 17 or the like onto the transparent electrode pattern formed portion 14 of the glass substrate 1 coated with the sealant 2. Next, (e) In the process, the liquid crystal 12 is placed on the lower plate 18 of the vacuum stacking jig.
Set the glass substrate 1 on which 8 to 9μ spherical spacers are attached, and clamp the other substrate 4, which has a portion where a transparent electrode pattern is formed and an excess portion, to the upper plate 1-19 of the same jig. Set with 20a and 20b.

Thereafter, the inside of the chamber 9 is evacuated using the vacuum pump 10, the upper plate 19 is lowered using the cylinder 8, and the glass substrates 1 and 4 are stacked on top of each other. At this time, glass substrates 1 and 4
transparent electrode patterns are matched. And chamber 9
If the inside is opened to the atmosphere using the leak valve 13, the liquid crystal 12 is filled in the liquid crystal self. Furthermore, in the DL process, a weight 5 of 40 to 60 kg is applied to the liquid crystal cell filled with liquid crystal, and the liquid crystal is placed in a hot air circulation furnace 6 at a temperature of 150°C.
Let sealant 2 harden for about 2 hours. At this time, the liquid crystal 12 in the liquid crystal self excessively flows out from the injection port 3 due to thermal expansion, but the excess portion 15 of the glass substrate 1.4 and the enclosure 1
6, it accumulates near the injection port 3. Therefore, even if the liquid crystal self is cooled and the liquid crystal 12 contracts after the sealant 2 has completely hardened, the excess liquid crystal 12 that has accumulated near the injection port 3 will flow out from the injection port 3 into the liquid crystal self. There is no air intrusion into the liquid crystal display. (In step 81, the excess portion 7b of the liquid crystal cell filled with the liquid crystal 12 and cured with the sealant 2 as described above is cut with a diamond cutter or the like to form the liquid crystal display element 7a.

In the above embodiment, liquid crystal corresponding to the expansion of the liquid crystal during heating is stored in the surplus portion 15 of the glass substrate, and is caused to flow back during cooling.
Although the liquid crystal is injected into the liquid crystal cell, liquid crystal may be injected into the liquid crystal cell near the liquid crystal injection port 3 using a dispenser or the like to make up for the shortage during cooling of the liquid crystal cell without providing a surplus portion on the glass substrate.

Further, in the above embodiment, the U-shaped enclosure 16 was provided in the surplus portion 15 of the glass substrate, but the enclosure 16 may have any shape or may be omitted.

〔Effect of the invention〕

As described above, in the manufacturing method of the present invention, the process from seal printing to liquid crystal filling conventionally required about 5 hours, but it has become possible to complete the process in a considerably shorter time. In addition, there is no air void when filling the liquid crystal, and by storing or supplying the liquid crystal in the excess portion of the glass substrate, air can enter to replace the liquid crystal that has leaked out excessively during cooling after the sealant has hardened. do not have.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing the manufacturing method of the present invention, and FIG. 2 is a process diagram showing a conventional manufacturing method. 1.4...Glass substrate, 2...Sealant, 3...
Liquid crystal inlet, 7...liquid crystal cell. Representative Patent Attorney Takashi Okabe (e) Figure 2 (C)

Claims (3)

[Claims] (1) A first step of dropping a predetermined amount or more of liquid crystal onto the transparent electrode pattern portion of the glass substrate printed with a sealant on the outer periphery of the portion where the transparent electrode pattern is formed, leaving a liquid crystal injection port; A second step of stacking the glass substrate onto which the liquid crystal has been dropped and another glass substrate in a vacuum to form a liquid crystal cell, a third step of curing the sealant by heating, and a step of curing the sealing agent through the liquid crystal injection port during heating and curing. A method for manufacturing a liquid crystal display element, comprising a fourth step of replenishing the liquid crystal cell with liquid crystal that is insufficient when the liquid crystal cell is cooled by flowing out liquid crystal. (2) In the fourth step, when the liquid crystal cell is cooled, replenishing liquid crystal prepared in advance is supplied into the liquid crystal cell from the liquid crystal injection port to replenish the insufficient liquid crystal.
2. Method for manufacturing a liquid crystal display element as described in Section 1. (3) In the first step, a sealant is printed on the outer periphery of the portion where the transparent electrode pattern is formed, leaving a liquid crystal injection port, and an excess portion is provided outside the liquid crystal injection port. A predetermined amount or more of liquid crystal is dropped onto the electrode pattern portion, and the fourth step is to cool the liquid crystal cell to cool the liquid crystal that flows out from the liquid crystal injection port into the surplus portion due to the heating and curing. 2. The method for manufacturing a liquid crystal display element according to claim 1, wherein the liquid crystal display element is returned into the liquid crystal cell from an inlet.