JPS62262824A - Manufacture of liquid crystal cell - Google Patents

Abstract

PURPOSE:To obtain the same effect as the case obtained by a multi-chamfered substrate, without executing a manufacture of a liquid crystal cell by the multi-chamfered substrate, by straightening the warp and waviness of substrate, which deteriorate the uniformity of a substrate interval, by pressure, and equalizing the substrate interval. CONSTITUTION:On the first electrode substrate 11, a transparent electrode is formed as an opposed electrode, and thereafter, an orientation processing is executed, and thereafter, a spacer 15 is scattered on the whole surface of a liquid crystal cell, and subsequently, a sealing agent 17 is provided by screen printing on an area being near the center side from the peripheral part of the opposed electrode substrate 11. On the other hand, on the second electrode substrate 13, a TFT being a driving element is formed in every picture element, and thereafter, an orientation processing is performed. Subsequently, the first electrode substrate 11 and the second electrode substrate 13 are stuck by the sealing agent 17, and the sealing agent 17 is heated and hardened under pressure. In such a case, a distortion caused by pressure is concentrated to the peripheral part of the substrate 11 and 13 of the outside peripheral part of the sealing agent 17. Therefore, the peripheral part of the outside from the sealing agent of the substrate 11 is eliminated by removing an area (a) to which the distortion of the peripheral part is concentrated, for instance, by a scriber 21.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a liquid crystal cell, and more particularly to a method for manufacturing a liquid crystal cell with more uniform substrate spacing (cell spacing).

(Prior Art) Conventionally, when manufacturing a liquid crystal cell having a structure in which first and second electrode substrates each having a transparent electrode are arranged facing each other using a sealant, a multi-sided substrate of the liquid crystal cell is used. Attempts are being made to manufacture a plurality of liquid crystal cells at the same time, thereby mass producing liquid crystal cells (for example, Japanese Patent Laid-Open No. 57-1155
(method disclosed in Publication No. 21).

In the conventional manufacturing method of liquid crystal cells using multi-panel substrates, two substrates each having a transparent electrode provided in association with each liquid crystal cell are placed facing each other with a spacer interposed therebetween, and an intervening method is employed between these substrates. Attach them using a pre-mixed sealant. As a result, each of the plurality of regions defined by the sealant and the substrate becomes a liquid crystal filled region of the liquid crystal cell. Thereafter, pressure is applied to the substrate to correct the warpage and waviness of the substrate, and the sealant is cured, and then liquid crystal is injected into the liquid crystal filling area to seal it. Thereafter, by dividing the substrate, individually divided liquid crystal cells are obtained.

When forming liquid crystal cells individually for each panel, warping or waviness of the substrate used impairs the uniformity of the spacing between the substrates, which greatly affects the display characteristics of the liquid crystal cell. The cell manufacturing method improves production efficiency,
It has been empirically known that this method is suitable not only for improving efficiency but also for suppressing the effects of warpage and waviness of the substrates and achieving uniform substrate spacing.

(Problems to be Solved by the Invention) However, for example, when manufacturing an active matrix type liquid crystal cell as a panel with a display area of about 640 x 400 dots, it is currently not possible to make multiple sides of the liquid crystal cell due to manufacturing process constraints. It is not possible to use a substrate of this size as a substrate for forming a liquid crystal cell, and therefore liquid crystal cells are formed on individual substrates for each panel. For this reason, T P T (
ThinFilm Transistor) or M I
M (j! etal-1nsulator- sacrifice eta
When a drive element array consisting of other drive elements is formed on an individual substrate, the substrate warps and undulates due to the formation, and these warps and undulations impair the uniformity of cell spacing. was there.

The purpose of the present invention is to solve the above-mentioned conventional problems, and to use a substrate that is warped or undulated due to the formation of a driving element array, for example, in cases where it is not possible to apply the manufacturing method using multi-sided substrates for liquid crystal cells. It is an object of the present invention to provide an excellent method for manufacturing a liquid crystal cell that can obtain uniformity of substrate spacing equivalent to that of the conventional method.

(Means for Solving the Problems) In order to achieve this object, according to the method for manufacturing a liquid crystal cell of the present invention, the central area of both or one of the first and second electrode substrates is A process of bonding the first and second electrode substrates using a sealant in the side area, a process of curing this sealant, and a process of releasing the pressure after the sealant hardens, and removing at least a portion of a peripheral region of both or either one of the first electrode substrate and the first electrode substrate.

In this case, for example, it is preferable that the substrate has a peripheral area that extends outward by about 10 mm or more from the position where the sealant is provided.

(Function) According to this method of manufacturing liquid crystal cells, even when liquid crystal cells are fabricated on individual substrates for each panel, warping and waviness of the substrates that impair the uniformity of the substrate spacing can be corrected by applying pressure. However, the spacing between the substrates can be made uniform.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. It should be noted that this figure is merely a schematic representation to the extent that the present invention can be understood, and therefore, the dimensions, shapes, and arrangement relationships of each component are not limited to the illustrated example.

FIGS. 1(A) to 1(C) are manufacturing process diagrams for explaining embodiments, and the present invention will be described below in the case where it is applied to a method for manufacturing an active matrix type liquid crystal cell.

In FIG. 1(A), 11 indicates a first electrode substrate and 13 indicates a second electrode substrate, and in this embodiment, these electrode substrates 11 and 13 have the same size.

After forming a transparent electrode as a counter electrode on the first electrode substrate 11, an alignment treatment is performed, and then spacers are scattered over the entire surface of the liquid crystal cell. Next, a sealant 17 is provided by screen printing on a region of the counter electrode substrate 11 that is closer to the center than the periphery, for example, a region that is about 10 mm or more closer to the center, although this varies depending on the dimensions of the substrate and other conditions.

On the other hand, on the second electrode substrate 13, a pixel electrode and a TPT as a driving element connected to the pixel electrode are formed for each pixel, and then an alignment process is performed. At this time, the TPTs formed on the substrate 137 constitute a driving element array. In addition, for example, a silver thread adhesive 1 for conduction between the boards is used to take out the electrodes.
8 is provided at a predetermined position on the substrate 13 by screen printing.

Next, as shown in FIG. 1(B), the first electrode substrate 11 and the second electrode substrate 13 are arranged facing each other with the electrode forming surfaces facing each other with a spacer interposed therebetween, and the electrode substrates 13 are interposed between these substrates. They are bonded together using a sealant 17. As a result, the spatial region defined by the sealant 17 and the substrates 11 and 13 becomes a liquid crystal filled region. Thereafter, the sealant 17 is cured by pressing with a pressure knife of 100 g/cm7, for example.

At this time, the distance between the first electrode substrate 11 and the second electrode substrate 13 is maintained at a constant distance by the spacer 15, but due to the pressure applied to obtain uniformity of the distance between the substrates as a liquid crystal cell. The strain is concentrated around the outer periphery of the sealant 17 and around the substrates 11 and 13.

Therefore, after the pressure is released after the sealant 17 has hardened, the area around the substrate 11 on the outer periphery of the sealant 17 where strain is concentrated (hereinafter, this area is referred to as the ablation area and is designated by reference numeral a in the figure). ) is cut out using, for example, a scriber 21 to remove the peripheral portion of the substrate 11 outside the sealant.

As a result, as shown in FIG. 1(C), the first electrode substrate 11
A liquid crystal cell is obtained in which the peripheral portion of the cell is removed.

The removal of the cut region a of the substrate 11 does not cause any new strain on the substrate that would disturb the substrate spacing, and the final substrate spacing is within the preset substrate spacing (setting value) ±0.2 gm. We were able to obtain the substrate spacing within the range. Practically, in TN mode and GH mode liquid crystal cells, it is required that the final substrate spacing is kept within the range of 0.2 to 0.3 gm. The substrate spacing finally obtained in the example was a substrate spacing that could provide good display characteristics for practical use.

1- In the embodiment described above, the strain on the substrate 11 concentrated at the periphery of the first electrode substrate 11 was removed by pressurizing the electrode substrates 11 and 13 for straightening. If the area around the second electrode substrate 13 where strain is concentrated (this area is indicated with a reference numeral in the figure as the ablation area) is also removed, the spacing between the substrates can be made more uniform. suitable. In carrying out this invention, only the peripheral part of the first electrode substrate on the outer periphery of the sealant may be removed, or only the peripheral part of the second electrode substrate on the outer periphery of the sealant may be removed. Alternatively, the peripheral portions of both the first and second electrode substrates may be removed.

Further, in the embodiment described above, the -L electrode substrate and the second electrode substrate are of the same size, but the sizes of these substrates may be different from each other. Furthermore, the peripheral area of the substrate that extends outside the sealant as the cut area of the substrate is applied only to the first electrode substrate, or only to the second electrode substrate.
Alternatively, it may be provided on both the first and second electrode substrates.

In addition, when removing the peripheral portion of both or one of the first and second electrode substrates on the outer periphery of the sealant, the peripheral portion may be removed in its entirety or in part. It's okay.

The ablation area a or b varies depending on the size, thickness, and other conditions of the substrate, but for example, the size of the substrate is a rectangular substrate with a side length of 100 mm x 100 mm, and a glass substrate with a thickness of 1.1 mm. When the substrate is used as the first and second electrode substrates, it is preferable to ensure at least about 10 mm or more from the edge of the substrate to the sealant.

(Effects of the Invention) As is clear from the explanation given above, according to the method for manufacturing a liquid crystal cell of the present invention, even when manufacturing liquid crystal cells on individual substrates for each panel, it is possible to maintain uniformity of the substrate spacing. By applying pressure, it is possible to correct the warpage and waviness of the substrate that impairs its properties, and to make the spacing between the substrates uniform. As a result, even if a liquid crystal cell is not manufactured using a multi-panel substrate, the same effects as those obtained using a multi-panel substrate can be obtained.

The present invention is particularly suitable for application to the manufacture of active matrix liquid crystal cells.

[Brief explanation of drawings]

FIGS. 1(A) to 1(C) are manufacturing process diagrams for explaining one embodiment of this invention [J]. 11... 1st electrode substrate, 13... 2nd electrode substrate 1
5...Spacer, 17...Sealant 19.
...Silver thread adhesive, 21...Scriver-0 Patent Applicant Oki Electric Co., Ltd. Il: No. 1-Denjima Mine Process 13: No. 2 C Ne) Basics and I5. Zuku-sa poor sand application 1st explanation 1st 17: Sea lL, Tl 1q: Vice-ministerial deputy 2f Niskraino〈-・. Illusionary Plan Thy General Flood Map

Claims (1)

[Claims] (1) When manufacturing a liquid crystal cell having a structure in which a first electrode substrate and a second electrode substrate are arranged facing each other using a sealant, the peripheral portion of both or one of the first and second electrode substrates. a step of bonding the first and second electrode substrates using a sealant in a region closer to the center than the region; a step of curing the sealant under pressure; and a step of releasing the pressure after the sealant has hardened. A method for manufacturing a liquid crystal cell, the method comprising: cutting off at least a portion of the peripheral region of both or one of the first and second electrode substrates on the outer peripheral portion of the sealant.