JPS61177436A - Manufacture of liquid crystal display element - Google Patents

Abstract

PURPOSE:To make liquid crystals contaminated at the time of injection less by injecting said liquid crystals by dropping them into the exposed section of a sealed section pattern which is formed between the 1st and 2nd base boards. CONSTITUTION:A sealed section pattern 2 which is annular and equipped with an angular projected section is formed on the main surface of the 1st base board 1 having the 1st electrode pattern. The 2nd base board 3 equipped with the 2nd electrode pattern is put on the main surface of the 1st base board 1, where the pattern 2 is formed, and sealed. Then the space formed by the pattern 2 is set to a negative-pressure condition by keeping the whole bodies of the base boards 1 and 3 in a vacuum atmosphere and a liquid crystal 4 is put in the depressed section formed by the exposed projected section and end face of the base board 3 by dropping. When the whole bodies of the base boards 1 and 3 are again put in a normal-pressure condition under an atmospheric ambience thereafter, the put liquid crystal 4 enters the space. Since the liquid crystal 4 hardly contacts end faces of the base boards 1 and 3 when the liquid crystal 4 is injected, the liquid crystal 4 can be injected under a less-contaminated condition and its reliability is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a liquid crystal display device, particularly (a method for injecting liquid crystal).

[Technical background of the invention]

Examples of conventional methods for manufacturing liquid crystal display devices include the following. That is, a glass substrate on which electrode grooves and a seal pattern are formed is combined and sealed with a glass substrate on which an electrode pattern corresponding to the above-mentioned electrode pattern is formed to form a composite plate. Then, liquid crystal is injected through an injection port provided in a part of the seal pattern and then sealed.

Injection port 4: Injecting liquid crystal C: takes the following means. In other words, with the composite plate under reduced pressure, the liquid crystal C with the inlet part placed in a container is immersed and left under atmospheric pressure. Liquid crystal is injected. [Problems in the background art] However, this manufacturing method has many disadvantages. For example, when the glass substrate has a predetermined shape (obtained by ni-cutting), the glass substrate There are filamentous gases and micro-crack-like glass particles that are generated when cutting the liquid crystal on the end face of the liquid crystal.Therefore, when the injection part is placed on the liquid crystal in the container C, these substances are mixed in with the liquid crystal. Contaminates the liquid crystal.

Also, at this time (:, Because unnecessary liquid crystal creeps up outside the seal pattern due to capillary phenomenon C2', an extra layer of liquid crystal C: becomes ζ;, this liquid crystal is removed. A process is required (-).

[Purpose of the invention]

The present invention has been made to solve these conventional drawbacks, and an object of the present invention is to provide a method for manufacturing a liquid crystal display element that allows liquid crystal to be injected in a state with little contamination and without waste.

[Summary of the invention]

That is, the present invention includes the steps of forming an annular seal pattern on a first substrate having a first IIE polar pattern;
A step of stacking and sealing a substrate and a second substrate having a second electrode pattern so that a part of the sealing part pattern is exposed, and a space formed by the first and second crystal temporary, the sealing part pattern and C2. After removing the pressure (: after pulling the liquid crystal, liquid crystal is collected in the recess formed by the exposed seal pattern and the end face of the second substrate, and the liquid crystal is injected into the space by returning the pressure removed to normal pressure. A method for manufacturing a liquid crystal display element, characterized by:

[Embodiments of the invention]

The details of the present invention will be explained below with reference to all the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention. First, as shown in FIG. 1 (C3), a first substrate (1) having a first *polar pattern (not shown), for example, a sealing part pattern having an annular and angular protrusion on one surface of a glass substrate. (2) is formed by printing C:.

This protruding portion of the seal pattern (2) is formed to be thicker than the other portions. Next C2 Figure 1 (blC
As shown in FIG.
) is overlapped and sealed on the side on which the seal pattern (2) is formed.Here, the first and second substrates (11
, +31 is approximately 1g, #I(- formed, and the second
The substrate (3) is smaller than the first substrate (1), and the first substrate (1) protrudes to expose a part of the seal pattern (2), that is, a angular protrusion. Then, the entire sealed first and second substrates (1) and +31 are held in a vacuum atmosphere, and inside the space formed by the first and second substrates (13, [3) and the seal pattern 12). Pull to relieve pressure.

Next, as shown in FIG. 1C, liquid crystal (4) is dropped and accumulated in the recess formed by the exposed protruding portion of the seal pattern (2) and the end surface of the second substrate (3). The position of the liquid crystal (4) to which three drops are placed is the volume of the space (=
This wrinkled liquid crystal (4) is determined by considering the viscosity of the liquid crystal (4).
4) It is necessary to consider the thickness of the exposed protrusion so that the water can be collected. Next, by CXing the sealed 'fPIl and the second substrate tl) and +31 in the atmosphere and returning the pressure to normal pressure C: as shown in the above-mentioned space C2, the first Il (dlt2) is The liquid crystal (4) prepared above is injected. A sealing material is dropped onto the top (4), and a cleaning treatment is further performed. In this way, a desired liquid crystal display element is obtained.

In this example, when the liquid crystal (4) is injected (:, the liquid crystal (4) does not come into much contact with the end surfaces of the first and second substrates (1), 131, so the liquid crystal (4) is kept in a state with little contamination. Since the liquid crystal (4) is injected within the annular seal pattern (2), it is possible to prevent the liquid crystal (4) from entering outside the seal pattern (2). As a result, the quality is the same, and a difficult cleaning process to remove the liquid crystal (4) that has entered the outside of the seal pattern (2) is not necessary.

The present invention can also be applied to a case where a plurality of liquid crystal display elements are formed on one glass substrate and then the individual liquid crystal display elements are cut and separated.

That is, at this time, as shown in FIG. Second board (
3) should be overlapped and sealed so that the angular protrusion is exposed. Then, by carrying out the same steps as shown in FIG. 1, a large number of liquid crystal display elements can be obtained at one time.

If it is acceptable to leave the exposed protruding portion in FIG.

This eliminates lateral flow of the sealing material, further improving reliability. Also'! When the $1 and second substrates (13, +31 are overlapped and sealed), the pattern of the exposed seal part is not limited to a angular protrusion, but may be any shape that can store the liquid crystal (4). It doesn't matter.Furthermore, the seal part pattern (2) is attached to the first and second substrates f1).
, +31, and then the first and second substrates (11, +31 may be overlapped and sealed. In this way, the liquid crystal (11, +31) of the seal pattern (2) 4) There is no need to form the part that collects the liquid in advance to be thicker than other parts.

〔Effect of the invention〕

As explained above, the method for manufacturing a liquid crystal display element of the present invention involves injecting 7 drops of liquid crystal into the exposed part of the annular seal pattern when the first and second substrates are overlapped and sealed. (: Therefore, contamination of the liquid crystal during injection can be reduced and the liquid crystal can be prevented from entering outside the seal pattern.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the invention, and FIG. 2 is a diagram showing another embodiment of the invention. (1)... 1st M plate + 21... Seal part pattern (
3)...Second board (4)...LCD agent Patent attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 2

Claims (1)

[Claims] forming an annular seal pattern on a first substrate having a first electrode pattern; and forming a ring-shaped seal pattern on a first substrate and a second substrate having a second electrode pattern such that a part of the seal pattern is exposed. After the step of stacking and sealing, and applying a negative pressure to the space formed by the first and second substrates and the sealing pattern, the exposed sealing pattern and the end face of the second substrate are connected to each other. A method for manufacturing a liquid crystal display element, comprising the steps of: storing liquid crystal in a recess formed in the recess, and injecting the liquid crystal into the space by returning the negative pressure to normal pressure.