JPH0323419A - Production of liquid crystal panel - Google Patents

Abstract

PURPOSE:To prevent the degradation in a liquid crystal display grade by applying a sealant by using a dispenser on the outer peripheral part of the panel of one electrode substrate and curing the sealant in the state of superposing the other electrode substrate on this electrode substrate to form a liquid crystal cell and then packing the liquid crystal into the cell. CONSTITUTION:Two sheets of the electrode substrates 15 subjected to necessary film forming treatments of electrode films, oriented films, etc., on the substrates are prepared. One thereof is imposed on a stage 16 of a dispenser and an adhesive 13 to serve as a spacer/sealant is applied only on this electrode substrate 15. The other electrode substrate 15 is superposed on one electrode substrate 15 coated with the adhesive 13 to serve as the spacer/sealant. The sealant is cured at a high temp. or ordinary temp. in this state to form the liquid crystal cell. The liquid crystal is packed into the cell to form the liquid crystal panel. The oriented films of the liquid crystal panel, therefore, do not come into contact with any in the applying stage for the adhesive. The high-grade liquid crystal display characteristics are obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for manufacturing a liquid crystal panel that performs liquid crystal display.

(b) Conventional technology FIG. 4 shows a cross section near the end of a typical liquid crystal panel.

In manufacturing the liquid crystal panel shown in the same figure, liquid crystal. It is necessary to seal the periphery of the two electrode substrates 4l, 4l for enclosing +4, and to apply a sealant 43 which serves as a sealant between the substrates, and the coating method is so-called screen printing. The method is common (Tokuko Sho 5 3
-10. 1 6 2).

As shown in Figure 2, the printing screen plates used in this screen printing method are made of chemical fibers such as polyester,
Alternatively, a screen 2l made of ffi wire mesh or the like is fixed to the frame 24, and the ceremonial agent 22 is applied onto the screen 21, leaving only the desired shape portion (print pattern) 23, so that the screen 2l can be printed. This printing screen plate 23 is used to print an adhesive that serves as a spacer and a sealant.

Figure 3 illustrates the screen printing process.
1 is a printing screen plate, 32 is a 1i polar substrate, 33 is a squeegee, 34 is an adhesive, and 35 is a stage. As is clear from the figure, when the adhesive 34 is applied with a squeegee 35 on the printing screen plate 31 overlapping the electrode substrate 32, the printing pattern of the adhesive 3.1 on the electrode substrate 32 is changed.

(c) Problems to be Solved by the Invention In the conventional screen printing method as described above, the printing screen plate 31 comes into direct pressure contact with the electrode substrate 32. IB contact tL to the upper layer alignment film (alignment film 12 in Figure 4)
Printing screen plate 31, and Aluminum agent 2
Impurity ions in the material itself and printing screen plate 3
Impurities resulting from the cleaning residue in the cleaning process performed in step (2) to remove adhesive No. 3 remaining on the substrate 1 and impurities of the cleaning solution itself adhere to the alignment film of the electrode substrate 32. For this reason, the attached impurity ions lower the resistivity of the liquid crystal 44 and deteriorate the display characteristics of the liquid display device.

In addition, since the printing screen plate 3l uses chemical fibers such as polyester, metal wire mesh, etc., the alignment film (alignment film 42 in FIG. 4) is coated with the weave pattern or mesh pattern of chemical fibers such as polyester, metal wire mesh, etc. during printing. The display quality of the liquid product display device deteriorates due to unevenness and scratches caused by the mesh. In addition, in the screen printing method, two electrode substrates (41 and 41 in FIG. 4) are printed depending on the conditions of the screen plate such as the thickness of the gift 22, the type of mesh, the line width of the printed pattern, and the type of adhesive 34. The width of the adhesive (43 in Fig. 4) after being cured and fixed by a heavy saw becomes constant. Therefore, in order to determine the adhesive width conditions, it is necessary to conduct tests using a wide variety of printing screen plates. In addition, in the screen printing method, as shown in Fig. 3, l? In order to print the ff agent 34 with the squeegee 33, the adhesive 34 that is actually printed is
(2) Means for Solving the Problem The method for manufacturing a liquid crystal panel of the present invention is based on the method for manufacturing a liquid crystal panel of the present invention. Apply a sealant to the outer periphery of the panel using a dispenser, and with the sealant applied to one electrode leather plate and the other electrode board, apply the sealant and seal the liquid crystal cell. The cell is then filled with liquid crystal.

(E) Effect According to the present invention, by applying an adhesive that serves as a smoother and a sealant using a dispenser, the alignment film of the liquid crystal panel does not come into contact with anything during the adhesive application process. Since impurity ions and the like do not adhere to the substrate, and there is no unevenness such as scratches or dents on the alignment film, it is possible to obtain high-quality liquid crystal display characteristics.

Also, the amount of adhesive used as a spacer and sealant. It is possible to reduce the amount of sealing resin to the same level as the amount actually used for liquid crystal panels. Therefore, the adhesive width conditions can be set more easily and in a shorter time than with the screen printing method by changing the application conditions, and the adhesive width can be easily and continuously changed as needed. It is also possible to do so.

(f) Example FIG. 1 shows the structure of a defsvenser (painted in blue) used for applying a spacer/sealant in the method of manufacturing a liquid crystal panel of the present invention. In the same figure, 11 is filled with adhesive l3 that serves as a sealant! It is a syringe-shaped container with adhesive 1 at the tip of the syringe volume 14z.
A needle-shaped portion 12 is provided for the qt output of 3. 1
4 is a pressurizing part that adjusts the pressure of nitrogen gas in the syringe. Incidentally, the syringe container 511 equipped with the second FF section l1 is fixed to an arm 2 which can be moved in the x-y-z directions (vertically, horizontally, up and down). 15 is one T-pole substrate for the 1-α product panel, and 1G is a stage on which the 1-polar electrode 15 is made soft.

Next, a method for manufacturing a liquid crystal panel according to the present invention using the above-described dispenser shown in FIG. 1 will be explained.

First, two t-pole substrates 15 and 15, which are made of glass and have undergone necessary film processing such as a t-pole film and an alignment film, are prepared, and one of the t-pole substrates 15 and 15 is placed on the stage IGI-1 of the disvenser. ni a
Then, only one of the tL electrode substrates 15 is coated with adhesive I3, which serves as a smoother and a sealant.

That is, the syringe container 6z is positioned around the panel with respect to the t-pole substrate 15 on the stage l6! Move around the center and move this ζ
When tracking the Nell curve orientation. The adhesive I3 is injected from the needle-like part 12 at the tip of the syringe by applying the above pressure to the F part 14. Therefore, the adhesive l
3 is applied.

In this adhesive 13 application process, the width of the adhesive to be removed (i.e., the application width of the smoother and sealant) depends on the force for injecting the adhesive 13, the moving speed, the diameter of the needle portion 12, etc. Can be set to a stable value.

In this way, one electrode substrate 15 coated with adhesive 13 serving as a spacer and a sealant is applied to the other electrode plate 15.
Overlap. Then, in this state, the sealant is cured at high temperature or room temperature to form a liquid crystal cell, and by filling the cell with liquid crystal, a liquid crystal panel as shown in FIG. 4 is obtained.

(G) Effects of the Invention In the method of manufacturing a crystal panel according to the present invention, a dispenser is used to dispense adhesive agent that serves as a spacer and sealant. Ir
Therefore, various problems that occurred in the screen printing process of promotion rice, namely, the adhesion of impurity ions to the alignment film due to contact between the electrode plate and the seal printing plate, and This causes problems such as a decrease in crystal display characteristics due to a decrease in the specific resistance of the liquid product, and a decrease in liquid crystal display quality due to unevenness such as scratches and creases on the alignment film caused by the mensch of the printed seal plate. is resolved. Therefore, it is expected that the initial display characteristics of the liquid crystal display device will be improved, and the reliability will be increased during aging, and the overall yield of the liquid crystal display device will be improved.

Furthermore, according to the present invention, the amount of so-called adhesive used as a spacer ridge sealant can be significantly reduced compared to conventional methods, so there is no need for the process of cleaning printing sticker plates, which conventionally had to be carried out frequently. Become. That is, the manufacturing cost in the manufacturing process of the liquid crystal display device is reduced because there is no need to replace the printing sticker plate, which conventionally required frequent replacement with a new one. Furthermore, the rice promotion method requires testing using a wide variety of printing screen plates in order to determine the shape and width of the sealing adhesive, which requires a large amount of money and 1 hour (77 yen).
Even though I was in danger of spending 3k. According to the present invention, the desired shape of the sealing resin can be easily formed at low cost and in a short time by controlling the x-y-z directions. By controlling this movement in two directions (X-Y) by a computer and storing the data in a storage device, the shape patterns of a wide variety of seal resins can be recorded by reading the shapes of seal adhesives using a tt device. Changes can be made easily.

[Brief explanation of drawings]

Figure 1 shows an adhesive dispenser used as a spacer and a sealant used in the method of manufacturing a liquid crystal panel of the present invention.
Figure I & Figure 2 is a schematic diagram of the printing screen printing plate used in the rice promotion method, Figure 3 is a schematic diagram showing the screen printing method for one pair of rice, and Figure 4 is a cross-sectional view of the main part of the residue crystal panel. 1l...syringe container, l2...nail-shaped part, l3...
Adhesive, ]4... Pressure part, 15... TL electrode plate, 1
6... Stage.

Claims (1)

[Claims] (1) Use a dispenser to apply a sealant to the outer periphery of the panel of one electrode substrate, and with the sealant overlaid on the other electrode substrate, cure the sealant to display the liquid crystal display. A method for manufacturing a liquid crystal panel, comprising forming cells and filling the cells with liquid crystal.