JPH01102519A - Manufacture of different type liquid crystal cell - Google Patents

Abstract

PURPOSE:To obtain the titled cell whose thickness is uniform and whose edge is sharp by printing simultaneously an auxiliary printing pattern having supple mentary length against length in the direction orthogonal to the printing direc tion of a printing pattern of an oriented film so that the printing pattern in said direction always has a prescribed length. CONSTITUTION:Auxiliary printing patterns 14, 15 are separated from a printing pattern of an oriented film 13 and formed in other part than the part for constituting a liquid crystal cell, in the direction orthogonal to the printing direction A, by which a contact area to a glass substrate 12, namely, the length of all of the printing patterns 13, 14 and 15 is always kept constant. In such a way, the glass substrate 12 on which the oriented film 13 is formed is cut along the periphery of the oriented film 13 as shown by a chain line B, and the shape of a glass substrate as shown in the figure is obtained. A printing output is always constant, and accordingly, thickness of the oriented film 13 which is printed is uniform in any part, and the edge is printed sharply.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a modified liquid crystal cell.

[Conventional technology and problems]

Conventionally, liquid crystal cells are made by forming transparent electrodes made of ITO (indium oxide) or the like on the opposing inner surfaces of each glass substrate, and then forming an alignment film made of polyimide or the like on top of the transparent electrodes. The glass substrates are stacked at a predetermined interval and pasted with a sealing adhesive along the periphery of the space defined by the glass substrate, and the liquid crystal injection hole formed by the cut in the sealing adhesive is inserted into the glass substrate. It is formed by filling the space between them with liquid crystal by, for example, a vacuum injection method, and finally sealing the liquid crystal injection hole with a sealing adhesive.

Here, the alignment film is formed on the glass substrate by forming a printing plate 3 mounted on the cylindrical surface of a cylindrical plate cylinder 2 on the surface of the glass substrate 1 by flexography, as shown in FIG.
This is done by printing the alignment film 4 using. The printing plate 3 is a relief plate with a desired pattern of the alignment film 4, and is pressed against the glass substrate 1 with a constant force during printing.

However, when the liquid crystal cell is an atypical liquid crystal cell, for example, when a triangular liquid crystal cell 5 as shown in FIG. Since the shape of the film 6 is similarly triangular, the shape of the convex portions of the printing plate 3 when printing the alignment film 6 by the flexography method is also triangular.

By the way, the force with which the printing plate 3 is pressed against the glass substrate during printing is constant, and the contact area of the printing plate 3 having a triangular convex shape with the glass substrate, that is, for example, the pressure of the printing plate 3 against the glass substrate is constant. The lateral length of the convex portion changes during printing, and the contact area is relatively small at the top of the liquid crystal cell 5 in FIG. 4 (and the contact area is relatively large at the bottom of the liquid crystal cell 5, so
The printing pressure of the printing plate 3 against the glass substrate during printing becomes relatively large in the upper part of the liquid crystal cell 5 and the thickness of the alignment film 6 due to printing becomes thin, and it becomes comparatively small in the lower part of the liquid crystal cell 5. The thickness of the alignment film 6 due to printing increases,
The thickness of the alignment film 6 on the upper and lower sides of the liquid crystal cell 5 becomes uneven, and the edges of the alignment 1II6 cannot be printed sharply, so that the display quality of the liquid crystal display element constituted by the liquid crystal cell 5 deteriorates.

[Purpose of the invention]

In view of the above points, the present invention provides a method for manufacturing a liquid crystal cell that has a uniform thickness and sharp edges by keeping the printing pressure of the printing plate on the glass substrate constant even in the case of an irregularly shaped liquid crystal cell. is intended to provide.

Means and actions for solving problem C] The above purpose is to
According to the present invention, when printing an alignment film on a glass substrate constituting an irregular liquid crystal cell by a flexography method,
Simultaneously print an auxiliary printing pattern having a length complementary to the length of the printing pattern of the alignment film in the above direction so that the printing pattern in the direction perpendicular to the printing direction always has a constant length. This is achieved by a method of manufacturing an irregularly shaped liquid crystal cell in which the printing pressure on the glass substrate is always kept constant.

According to this invention, in addition to the printing pattern of the alignment film, an auxiliary pattern complementary to the printing pattern of the alignment film is simultaneously printed. Since the length of the printed pattern in the direction perpendicular to the printing direction is always constant, the printing pressure of the printed pattern on the glass substrate that makes up the irregular-shaped liquid crystal cell is also always kept constant, thus achieving a uniform thickness. An alignment film is formed on the glass substrate, and the edges of the alignment film are also formed sharply.

〔Example〕

The present invention will be described below based on embodiments shown in the drawings.

1 and 2, one embodiment of a liquid crystal cell to which the present invention is applied is shown. This liquid crystal cell 11 basically has IT on the mutually opposing inner surfaces of each glass substrate.
Two glass substrates on which a transparent electrode made of O (indium oxide) or the like is formed, and an alignment film made of polyimide or the like formed thereon are placed one on top of the other, and while maintaining a constant distance between these glass substrates, The liquid crystal cell 11 is configured by adhering along the peripheral edge of the glass substrate with a sealing adhesive, and the liquid crystal cell 11 is an irregular liquid crystal cell (in the illustrated case, a triangular liquid crystal cell).

The glass substrate 12 constituting the liquid crystal cell 11 has a large rectangular shape as shown in FIG. 2 when printing an alignment film, and flexography is performed on the glass substrate 12 in the same manner as in the past. The alignment film 13 is printed using a printing plate mounted on the surface of a cylindrical plate cylinder by a method, and at the same time, auxiliary printing patterns 14 and 15 on both sides are also printed on the glass substrate 12. These auxiliary printing patterns 1
4°15 is the contact area of the printed pattern of the alignment film 13 with the glass substrate 12 in the direction perpendicular to the printing direction A;
That is, it is formed in a portion other than the portion that is to constitute the liquid crystal cell away from the printed pattern of the alignment film 13 so as to have a complementary length to the printed pattern 13.14°15. The entire contact area to the glass substrate 12, ie, the length, is always kept constant.

Glass substrate 12 with alignment film 13 formed in this way
is cut along the periphery of the alignment film 13 as shown by the chain line B in FIG. 2, thereby obtaining a glass substrate having the shape shown in FIG. 1. Using the glass substrate 12 on which the alignment film has been formed in this manner, the liquid crystal cell 11 is constructed as described above by a method similar to the conventional method.

The liquid crystal cell according to the present invention is configured as described above,
When printing the alignment film 13 on the glass substrate 12 by flexography, the printing pressure of the entire printing pattern 13, 14, 15 on the glass substrate 12 is
Since the contact area, that is, the length of the printed alignment film 13 is always constant, it is always maintained uniformly. Therefore, the thickness of the printed alignment film 13 is uniform in all parts, and its edges are sharp. is printed on.

〔Effect of the invention〕

As described above, according to the present invention, when an alignment film is printed by flexography on a glass substrate constituting an irregular liquid crystal cell, the printed pattern always has a constant length in the direction orthogonal to the printing direction. By simultaneously printing an auxiliary printing pattern having a complementary length to the length of the printing pattern of the alignment film in the above direction so that the printing pressure on the glass substrate is always kept constant. Therefore, in addition to the printing pattern of the alignment film, in order to simultaneously print an auxiliary pattern that is complementary to the printing pattern of the alignment film, the printing direction of the printing pattern, that is, the printing pattern of the alignment film and the auxiliary printing pattern. The length in the orthogonal direction is always constant. Therefore, the printing pressure of the printing pattern on the glass substrate constituting the irregular liquid crystal cell is also kept constant.

Thus, according to the present invention, even in the case of irregularly shaped liquid crystal cells having various shapes, by keeping the printing pressure of the printing plate on the glass substrate constant, the cells can have a uniform thickness, and
An extremely excellent liquid crystal cell with sharp edges is provided, and by using this, a liquid crystal display element with extremely high display quality can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing an embodiment of a triangular liquid crystal cell to which the present invention is applied, and FIG. 2 is a plan view of a glass substrate on which an alignment film of the embodiment of FIG. 1 is printed. FIG. 3 is a diagram showing a conventional alignment film printing method, and FIG. 4 is a plan view showing an example of a triangular liquid crystal cell obtained by the printing method shown in FIG. 11...Liquid crystal cell; 12...Glass substrate; 13
...Alignment film; 14.15...Auxiliary printing pattern;
A...Printing direction. Patent applicant: Stanley Electric Co., Ltd. Representative: Patent attorney Kodo Hirayama: Patent attorney Yasuzo Kaizu Figure 2 Figure 3 Figure w4

Claims (1)

[Claims] When printing an alignment film by flexography on a glass substrate constituting a unique liquid crystal cell, the printed pattern of the alignment film is adjusted so that the printed pattern always has a constant length in the direction perpendicular to the printing direction. An irregularly shaped liquid crystal cell characterized in that the printing pressure on the glass substrate is always kept constant by simultaneously printing an auxiliary printing pattern having a length complementary to the length in the above direction. Production method.