JPS60241020A - Production of liquid crystal display element - Google Patents

Abstract

PURPOSE:To speed up filling of a liquid crystal and to permit sure and easy mating of substrates by positioning the end faces of the substrates by means of specific positioning pins, subjecting the substrates to pattern exposing and dripping of the liquid crystal then mating the patterns by means of the positioning means in the same positional relation again and superposing the substrates in a vacuum. CONSTITUTION:The end faces of the glass substrates 1 provided with transparent electrodes on which photoresists 1b, 4b are coated are positioned by means of >=3 positioning means 15a-15c. Segments and common electrode patterns are exposed thereon. A required amt. of the liquid crystal is dripped to one of the substrates 1, 4, then the end faces of the segment and common substrates 1, 4 are positioned by the pins 15a-15c having the same positional relation as the positional relation of the pins used in the stage of exposing to mate the patterns. The substrates 1, 4 are thereaftaer superposed on each other in a vacuum. The shorter time is necessitated for filling the liquid crystal by the above-mentioned processes and since the pins 15a-15c having the same positional relation as the positional relation of the pins used in the stage of exposing the electrode patterns are used to superpose the substrates 1, 4, the easier superposition in the shorter time is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of manufacturing a liquid crystal display element by filling a space between two glass substrates with liquid crystal.

[Prior art]

A conventional method for manufacturing a liquid crystal display element will be explained based on FIG. 4 (1). First, in the (al process), a sealing agent 2 such as an epoxy resin is printed on one side of a glass substrate 1 on which a pattern of transparent electrodes (for example, In2O3 or 5N02, etc.) is formed using a screen printer so as to provide a liquid crystal injection port 3.

Then, in the fbl process, the operator visually inspects the other glass substrate 4 to which the 8-9μ spherical subeigma is attached, and the operator visually inspects the pattern alignment mark 5.6 formed by the transparent electrode film.
Magnify the images using a magnifying glass, match the patterns, and overlap them. Next (in step C1), a weight 7 of 40 to 60 kg is applied and placed in a hot air circulation furnace 8 at 150° C. for 3 hours, and the sealant 2 is applied to form a liquid crystal cell 9.

Furthermore, in the fdl process, this liquid crystal cell 9 is transferred to the cylinder 11.
It is fixed to the chuck lla provided at the tip of the . Then, the liquid crystal tray 12a containing the liquid crystal 12 is evacuated using the vacuum pump 13 inside the chatuba 10. When the chamber IO is evacuated, the gap within the liquid crystal cell 9 is also evacuated. In the te+ step, the evacuated liquid crystal cell 9 is immersed in the liquid crystal 12, the atmosphere release valve 14 is opened, and the inside of the chamber 10 (2) is returned to atmospheric pressure. The liquid crystal 12 is filled into the liquid crystal cell 9 through the liquid crystal injection port 3 due to the pressure difference between the inside of the liquid crystal cell 9 and the inside of the chamber 10 .

However, in this manufacturing method, it takes about 5 minutes to match the patterns of the two glass substrates 1 and 4, and requires a skilled worker, which is a very difficult process to create a continuous line. It is. Another problem was that it took about 5 hours from printing the sealant to filling the liquid crystal.

[Purpose of the invention]

The present invention has been made in view of the above problems, and its purpose is to be able to fill liquid crystal at high speed, and to
It is an object of the present invention to provide a method for manufacturing a liquid crystal display element that allows easy pattern alignment of two glass substrates.

[Structure of the invention]

In order to achieve the above object, the present invention includes the following steps: (3) positioning the end face of a glass substrate with transparent electrodes coated with photoresist with three or more positioning pins and exposing segment and common electrode patterns; A step of dropping the required amount of liquid crystal onto one glass substrate, and a step of aligning the patterns by positioning the end surfaces of the segment 1- and common glass substrates using positioning pins having the same positional relationship as used during exposure, The glass base 1v
The method is characterized in that it has a step of overlapping the two in vacuum.

〔Effect of the invention〕

As stated in -1-, the present invention requires 1. one glass substrate.

The method used is to manufacture a liquid crystal display element by dropping the required amount of liquid crystal and overlapping it with another glass substrate in a vacuum.The liquid crystal is not filled between the glass substrates using a pressure difference. Therefore, the time required to fill the space between the glass substrates with liquid crystal can be significantly reduced compared to conventional methods.
Furthermore, since the glass substrates are stacked using positioning pins that have the same positional relationship as those used in the process of exposing the electrode pattern, set the glass substrates so that they match the positioning pins. Since positioning can be performed by just using the above method, there is an excellent effect (4) in that the glass substrates can be stacked easily and in a short time.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

In FIG. 1, first in the fa step, as shown in step (1), a transparent electrode film (I n 203 or S n 0
2, etc.) Apply a FNA 1-resist lb (for example, UV type) to the soda glass substrate 1 on which la is vapor-deposited using a roll coater or the like. Similarly, as shown in (2), a photoresist 4b is applied to the soda glass substrate 4 on which the transparent electrode film 4a has been deposited using a roll coater or the like. (In the bl process, the workpiece positioning jig 15 is
The transparent electrode pattern is exposed to light using a UV lamp 16. In this workpiece positioning jig 15, positioning pins 15a, 15b, 15c, and 15d are installed symmetrically with respect to the center line of the jig 15. Then, the end surfaces of the soda glass substrate 1 with the transparent electrode film coated with the photoresist 1b in the ta+ step are applied to the positioning pins 15a, 15b, and 15c, and the segment (or common) electrode pattern 17 is exposed using the end surfaces as a reference. . In the fcl process, (5
) is the soda glass substrate 4 with a transparent electrode film coated with the claw I/resist 1b, as shown in (11, +21).
Next, place the end faces of the positioning pins 15a, 1.5b and +
5d as a reference, the common (or segment) electrode pattern 18 is exposed. After this, the photoresist is developed,
Through etching of the transparent electrode film and peeling off of the photoresist, transparent electrode patterns (for example, those shown in FIGS. 2(at) and 2(bl)) are formed on each glass substrate 1.4.

After going through this process, 1. Positioning pins 1.5a, 15b, 15c (or 15a,
15b, 15d) are superimposed with the transparent electrode patterns on the inside, the segment and common transparent electrode patterns match.

The substrates on which these transparent electrode patterns are formed are subjected to alignment treatment (in the d+l step, one glass substrate 1 is used), and a liquid crystal injection port 3 is provided with a sealant 2 such as epoxy resin using a clean printing machine. Print as follows.

Thereafter, a spherical spacer of 8 to 10 μm is attached to the other glass substrate 4. In the tel process, the end surface of the glass substrate 4 to which the base (6) has been attached is placed on the upper plate 20 equipped with positioning bins 19a, 19b, and 19C at the same positions as the positioning bins 15a, 15b, and 15C in the previous fbl process. The substrate is positioned and held by bushings 21a and 21b. On the other hand, hold the glass substrate 1 coated with the sealant 2 in the fdl process seven times (to the right of the brake 1-22), and close the lid of the chamber 23 (on the front side of the figure, but not shown). The inside of the chamber 23 is evacuated by the closed vacuum pump 24. The liquid crystal 26 in the liquid crystal degassing tank 25 is constantly degassed by the vacuum pump 24. Then, this liquid crystal is passed through the metering device 27 to the shutoff valve 28. From the required amount to the center of glass substrate 1, for example 0.3 cc plus 10
~20% extra supply. Thereafter, the glass substrate 1 is moved to the left using a claw 29a provided at the tip of the cylinder 29, and the positioning bin 19c side is positioned. Furthermore, a cylinder (not shown) provided on the lid of the chamber 23 positions the glass substrate 1 in the bins +92 and 19b.
Position and fix on the side. And by cylinder 30"
-(7) Lower the measuring plate 20, and overlap the glass substrates 1 and 4 and bond them together at a temperature of about 100 ml. When the leak valve 31 is opened to expose the inside of the chamber 23 to the atmosphere, the front surface of the liquid crystal element formed by bonding the glass substrates 1 and 4 is filled with liquid crystal. Next, in a (fl step), a weight 34 of 40 to 60 kg is applied to the liquid crystal element 32 in which the glass substrates 1 and 4 are stacked, and the sealant 2 is cured in a hot air circulation furnace 33.

According to the embodiment described above, conventionally it took about 5 hours from printing the sealant to curing the seal and filling the liquid crystal.
This made it possible to speed up the process to about 2 hours. Furthermore, the overlapping process can be automated using a simple jig that positions the segment and common patterns by applying a bottle to the edge of the board, reducing the process from 5 minutes to 10 minutes.
It can now be completed in seconds.

In the above embodiment, the exposure on the glass substrate 1.4 is performed using the four positioning bins 15a, 15b, 15c, and 15d in the steps tb) and fc>, but in FIG. 21, (as shown in 31, (
8) Using the three positioning bins 15a, 15b, and 15c as references, place photoresist 1 on one glass substrate 1.
The segment (or common) electrode pattern may be exposed with b facing upward, and the common (or segment) electrode pattern may be exposed on the other glass substrate 4 with photoresist 4b facing downward.

Further, the number of bins for positioning the glass substrate is not limited to three, and may be greater than three.

Further, in the above embodiment, the positioning bin 19a.

19b and 19c are positioning bins 15a and 15b.

1 and 5C, but they may be placed in the same position as the positioning bins 15a, 15b, and 15d.

Furthermore, the vertical relationship of the glass substrate 1.4 is determined by the positioning bin 1.
Any of the reference positions can be set according to the reference positions 9a, 19b, and 19c.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing one embodiment of the present invention, FIG. 2 is an explanatory diagram showing the state of electrode pattern formation, FIG. 3 is a process diagram showing another exposure process, and FIG. ) It is a process diagram of a product. 1.4=Glass substrate, 15a, 15b, 15c. 15d...Positioning bin, 16...UV lamp, 2
6...Liquid crystal. Representative Patent Attorney Takashi Okabe (10) U) l-- Ward: 2 Middle

Claims (1)

[Claims] A process of positioning the end face of a glass substrate with transparent electrodes coated with photoresist with three or more positioning bottles and exposing the segment and common electrode patterns, and a process of dropping the required amount of liquid crystal onto one glass substrate. A liquid crystal display element comprising: a step of aligning the patterns by positioning end faces of segment and common glass substrates using positioning pins having the same positional relationship as used during exposure; and a step of overlapping the glass substrates in a vacuum. manufacturing method.