JPH02156221A - Manufacture of liquid crystal display element - Google Patents

Abstract

PURPOSE:To contrive the improvement of the sealing performance of an enclosing port for enclosing a liquid crystal by cutting an extended part and an enclosing path part between immediately before a sealing agent is hardened completely and immediately after the sealing agent for filling the enclosing path part and the enclosing port is filled. CONSTITUTION:An extended part 16 is formed on each of plural film substrates 11, 12 so as to be extended to the outside of a cell 14 from the peripheral part, and at the time of placing opposingly plural film substrates 11, 12, the extended part 16 and an enclosing path part protruded to the outside from the cell 14 by a sealing agent 13 are formed. Subsequently, a liquid crystal is enclosed into the cell through the enclosing path part 17, and next, the enclosing path part 17 is filled with an unhardened sealing agent 15 until it reaches an enclosing port 14a of the cell, and between immediately before the sealing agent 15 is hardened completely and immediately after the sealing agent 15 is filled, the extended part 16 and the enclosing path part 17 are cut from the cell 14. In such a manner, it can be prevented that the film substrate and the sealing agent the brought to interface peeling at the time of cutting, and the liquid crystal display element being compact and excellent in the sealing performance and having high reliability can be obtained.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for manufacturing a liquid crystal display element, and in particular, to a method for manufacturing a liquid crystal display element with improved sealing performance of a filling port for injecting liquid crystal into a cell thereof. Regarding the method.

(Prior art) In recent years, the demand for liquid crystal display elements has increased because they are thin, lightweight, and have low power consumption.As a result, there is a demand for low-cost devices that can withstand use in harsh environments. has been done. For this reason, various manufacturing methods have been implemented to improve the sealing performance of liquid crystal, which greatly affects the reliability and manufacturing cost of a liquid crystal display element.

Examples of conventional methods for manufacturing liquid crystal display elements of this type include those shown in FIGS. 3 to 6.

In the device shown in FIG. 3, two plastic substrates 1 with transparent electrodes are placed facing each other, and the peripheries of these substrates 1 are surrounded by a sealant 2 to form a cell 3. A liquid crystal (not shown) is sealed between the plastic substrates 1 through the formed filling port 1a, and then a small amount of sealant 4 is filled into the filling port 1a using a dispenser (not shown) to seal the filling port 1a. It has stopped.

The one shown in FIG. 4 is an example in which glass substrates 5A and 5B are used, but in this case, when forming the cell 6 in the same way as described above, the enclosing area with the sealant is partially removed to form the sealing opening 6a. After the liquid crystal is injected through the sealing port 6a, the sealing port 6a is sealed with a sealant 4.

What is shown in FIG. 5 is a plastic film substrate 7A,
7B, in order to ensure a predetermined adhesive area (adhesive strength), the sealant 4 is applied to the plastic film substrate 7A.

It is glued from the outer cut surface of 7B to the surface side.

However, in the method of manufacturing the liquid crystal display element shown in FIG.
Since it is necessary to form a
This limitation becomes noticeable when the size of the device is small. Further, the method for manufacturing the liquid crystal display element shown in FIG. 4 is not suitable for using a plastic film substrate, and therefore it is difficult to reduce the thickness of the liquid crystal display element. That is,
Since plastic film substrates are generally thin, it is difficult to secure enough adhesive area for the encapsulant, and since burrs may appear on the cut surface of the substrate when cutting, it is necessary to apply a relatively high viscosity encapsulant from the side to the inside. Because it was difficult to inject, a reliable seal could not be achieved. Furthermore, the fifth
In the method for manufacturing the liquid crystal display element shown in the figure, since the sealant is bonded to the surface side of the plastic film substrates 7A and 7B, the overall thickness of the protective element increases, and the plastic film can be made thinner. I had to sacrifice the benefits of the board.

Therefore, the present applicant filed Japanese Patent Application No. 152946/1983 in order to provide a liquid crystal display element that is compact and can improve sealing reliability.

As shown in FIG. 6, this product has an extension 8a formed on a pair of plastic film substrates 8A, 8B, and a sealant 2 on the pair of plastic film substrates 8A, 8B.
An enclosure path 9a having an externally protruding enclosure path 9a is formed by this, and then, after a liquid crystal (not shown) is sealed through the enclosure path 9a, the enclosure path 9a is sealed by filling with a sealant 4.

When the sealant 4 is cured or semi-cured, the extension part 8a and the sealing path 9a are left behind at the position of line A-A in the figure.
The series of manufacturing steps is completed by cutting the part.

(Problems to be Solved by the Invention) However, even with the manufacturing method of the liquid crystal display element shown in FIG. There is room for improvement. That is, in this conventional method, the sealant 4 is filled into the sealing path 9a, and after the sealant 4 is cured or semi-cured, the extension portion of the cell 9 including the extension portion 8a and the sealing path 9a is filled. If this cutting step is performed after the sealant 4 has completely hardened, the impact during cutting will cause peeling at the interface between the sealant 4 and the plastic film substrates 8A and 8B, impairing the sealing performance. Something happened.

(Objective of the Invention) Therefore, the present invention solves the interface peeling between the encapsulant and the substrate by alleviating the impact when cutting the extension part and the enclosing path part, and improves the sealing performance of the encapsulant opening for enclosing liquid crystal. The purpose is to increase the

(Structure of the Invention) In order to achieve the above object, the present invention has a plurality of film substrates each having a plurality of electrodes arranged facing each other with a predetermined gap therebetween so that the electrode surfaces thereof face each other, and surroundings of the plurality of film substrates. A method for manufacturing a liquid crystal display element, in which a cell is formed by interposing a sealing member between parts, and a liquid crystal is sealed inside the cell, wherein the cell is sealed from the peripheral part to each of the plurality of film substrates. An extension part is formed to extend outward from the cell, and when the plurality of film substrates are arranged facing each other, the extension part and the sealing member form an enclosure path part that projects outward from the cell. The liquid crystal is sealed in the cell through the sealing path, and then an uncured sealant is filled into the sealing path until it reaches the cell's sealing opening, and immediately after filling the sealant, the sealant is completely filled. This is characterized in that the extension portion and the encapsulation path portion are cut from the cell immediately before curing.

Hereinafter, the present invention will be explained based on examples.

FIG. 1.2 is a diagram showing an example of a liquid crystal display element in which the method for manufacturing a liquid crystal display element according to the present invention is implemented.

In FIG. 1, 11.12 is a plastic film substrate with a plurality of electrodes, and the film substrate 11.12
are electrode surfaces 11a which have been subjected to display electrode pattern processing, alignment film formation, rubbing treatment, etc., by known methods, respectively.
, 12a. The film substrates 11 and 12 are arranged facing each other with a predetermined gap between them by a gap material (not shown) so that the electrode surfaces 11a and 12a face each other, and are bonded by a sealing agent 13 (sealing member) interposed between the peripheral portions of the film substrates 11 and 12 to form the cells 14. is formed. In this cell 14, a liquid crystal (not shown) is sealed in a space surrounded by a sealant 13, and a sealing opening 14a of the cell 14 provided for sealing the liquid crystal is sealed with a sealant 15.

As shown in FIG. 2(a), the film substrate 11.12 is previously formed integrally with an extension part 16 extending to the outside of the cell 14 and an extension part (hereinafter referred to as extension part 16, etc.) not shown in the drawings. After the electrode surface forming process, the sealing material 13 is screen printed on one of the film substrates 11 so as to extend toward the extension part 16. Next, the film substrate 12 is formed with a gap material dispersed therein in a separate process, and the above process is performed. A film substrate 11 is placed facing each other with electrode surfaces 11a and 12a facing each other, and is pasted together with a sealant 13.

At this time, the extension part 16 and the like and the sealant 13 form the filling opening 14a and the filling path part 17 that communicates with the filling opening 14a.Next, after the liquid crystal is sealed in the cell 14 through the filling path part 17, the second As shown in Figure (b), the uncured sealant 15 is filled into the sealing path section 17 and the sealing port 14a by a dispenser or the like (not shown), and the sealing port 14a is sealed.Then, the sealing material 15 is completely sealed. As shown in FIG. 2(C), the film substrate 11
．． The extension portion 16 and the like and the enclosing path portion 17 are cut from the cell 12, and the outer shape of the cell 14 described above is formed.

That is, in the method for manufacturing a liquid crystal display element in this embodiment, the extension portions 16 and the like extending from the peripheral portions of the plurality of film substrates 11 and 12 to the outside of the cell 14 are formed in each of the plurality of film substrates 11 and 12. When the substrates 11 and 12 are placed facing each other, the cell 14 is
forming an encapsulation path portion 17 projecting outward from the
enclosing a liquid crystal into the cell 14 through the enclosing path section 17;
Next, the uncured sealant 15 is filled into the sealing path portion 17 until it reaches the sealing port 14a of the cell 14, and the sealing agent 15 is extended from immediately after filling the sealant 15 until just before the sealant 15 is completely cured. section 16 etc. and the enclosure path section 17, that is, the cell 14
The extension portion of the cell 14 is cut from the cell 14.

In this embodiment, the sealant 15 is a room temperature curing epoxy resin, and the extension of the cell 14 is cut from the cell 14 so that the uncured sealant 15 does not flow. This is done before the sealant 15 is in a stopped state and hardened, preferably immediately after sealing with the sealant 15 having an appropriately selected viscosity.

If such a manufacturing method is implemented, the proper viscosity of the sealant 15 will be used to absorb and alleviate the mechanical impact when cutting the extension, and the interfacial peeling between the film substrate 11, 12 and the sealant 15 will be prevented. The sealing performance of the sealing port 14a of the cell 14 can be improved. Therefore, the reliability of the manufactured liquid crystal display element is increased, and the yield in the manufacturing process is also significantly improved. Furthermore, in the cell 14 after the cutting process, the area occupied by the sealing portion of the sealing port 14a is extremely small relative to the display area on the display surface, and the sealant 15 does not protrude outward from the cell 14. A compact liquid crystal display element with high sealing performance can be obtained. Furthermore, the liquid crystal display element manufactured based on this example was tested under an environmental condition of 60''C5.
When a performance test was performed by leaving the cell under 90% RH for 1000 hours, no air bubbles were found in the cell 14, nor were any electrical or optical abnormalities observed, confirming that it had sufficient sealing performance.

In this embodiment, a single liquid crystal display element has been described, but the present invention is not limited to this, and it goes without saying that the cutting step may be performed with a plurality of cells 14 arranged in series.

(Effect) According to the present invention, the extension portion and the encapsulation path portion are cut from the cell immediately after the sealant is filled into the encapsulation path portion and the encapsulation port until immediately before the sealant is completely cured. This makes it possible to use the viscosity of the encapsulant to reduce the mechanical impact during cutting and reliably prevent interfacial peeling between the film substrate and the encapsulant during cutting. A highly reliable liquid crystal display element with excellent sealing performance can be obtained.

[Brief explanation of the drawing]

FIG. 1.2 is a diagram showing an example of a liquid crystal display element in which the method for manufacturing a liquid crystal display element according to the present invention is carried out, FIG. 1 is an overall configuration diagram thereof, FIG. 2 is an explanatory diagram of the manufacturing process, 3rd ~
6 is a diagram showing a liquid crystal display element manufactured by a conventional manufacturing method, and FIG. 3 is a plan view of one conventional example, and FIG.
．． 5 is a sectional view of another conventional example, and FIG. 6 is a plan view of still another conventional example. Substitutes 11, 12...Film substrate, 11a, 12a
... Electrode surface, 13 ... Sealing agent, 14 ... Cell, 14a ... Sealing port, 15 ... Sealing agent, 16 ...Extension part, 17...Inclusion route part. Attorney Patent Attorney Figure 1 (a) (b) /6 / Mouth b

Claims (1)

[Claims] A plurality of film substrates with electrodes are arranged facing each other with a predetermined gap so that the electrode surfaces face each other, and a sealing member is interposed between the peripheral portions of the plurality of film substrates to form a cell, and the inside of the cell is A method for manufacturing a liquid crystal display element in which a liquid crystal is sealed in a liquid crystal display element, wherein an extension part is formed in each of the plurality of film substrates so as to extend from the peripheral part to the outside of the cell, When the substrates are placed facing each other, an encapsulation path portion is formed that protrudes outward from the cell by the extension portion and the seal member, and then the liquid crystal is encapsulated in the cell through the encapsulation path portion, and then the liquid crystal is sealed into the encapsulation path portion. The uncured sealant is filled until it reaches the sealing opening of the cell, and the extension part and the sealing path part are cut from the cell immediately after filling the sealant and just before the sealant is completely cured. A method for manufacturing a liquid crystal display element, characterized by: