JP2653447B2 - Manufacturing method of liquid crystal display element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a method for manufacturing a liquid crystal display element using a flexible substrate.

(Prior Art) In recent years, an ultra-thin liquid crystal display element has been desired depending on the application, and an electrode substrate using a plastic film instead of a conventional glass substrate has been made. This plastic film has the advantage of being flexible, being not destroyed by external forces in the bending direction, and being considerably lighter than those using conventional glass plates. Here, plastic films used as this type of substrate include polyethylene terephthalate (hereinafter, referred to as PET), polyether sulfone (hereinafter, referred to as PES), and the like.

On the other hand, in general, when manufacturing a large number of liquid crystal display elements,
In order to improve mass productivity, for example, a technique of “multiple-cavity” as described in Japanese Patent No. 1282413 is used. This method can obviously be applied to the case where the substrate is a plastic film.
No. 25, it is described.

(Problems to be Solved by the Invention) When a liquid crystal display device is manufactured by using "multi-cavity", there are the following differences depending on whether the substrate is a glass plate or a plastic film. First, when the substrate is a glass plate, when forming a multi-row, multi-plane liquid crystal cell on a single substrate, when removing unnecessary parts or disassembling into individual liquid crystal cells, an ultra-hard blade For example, a scratch of about 0.1 mm is made with a diamond blade, and the wound is cut into a required shape by, for example, striking the back from the back.

However, when the substrate is a plastic film, the substrate cannot be split, so that the thickness of the substrate is 1 /
It requires a very difficult operation to insert a blade to a depth of about 2 to 2/3 and peel off unnecessary parts. That is, compared with the case where the substrate is a glass plate, the ratio by mechanical impact (such as hitting) is impossible, and when removing an unnecessary portion, a sharp blade or a sharp point is provided between the two substrates. It is necessary to repeat the operation of inserting the tweezers or the like that have been interrupted and then peeling it off, which makes it difficult to mechanize.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a method of manufacturing a liquid crystal display element that can be easily divided into individual panels even when a flexible film is used as a substrate. And

[Structure of the Invention] (Means for Solving the Problems) According to the present invention, a pair of a first film substrate and a second film substrate on which a predetermined electrode pattern is formed are opposed to each other,
A step of forming a plurality of element portions on an inner surface separated by a predetermined distance from an end of the second film substrate by forming a barrier therebetween, and a peripheral portion showing the entire contour of the element portion. In the portion where only the second film substrate is cut, a half-cutting process is performed to a thickness of not less than 1/2 to not more than 2/3 of the second film substrate, and a peripheral portion showing an entire contour of the element portion. A step of cutting through the second film substrate at a portion where both the first film substrate and the second film substrate are cut, and performing a half cut to a thickness of not less than 1/2 to not more than 2/3 of the first film substrate; A step of removing only the necessary portion of the second film substrate by stripping the second film substrate from an end; and a step of cutting the first film substrate to separate the liquid crystal display elements. A method for manufacturing a liquid crystal display element, characterized in that:

(Function) In the present invention, when a flexible liquid crystal display element is manufactured by “multiple-piece production”, when the liquid crystal display element is divided into individual liquid crystal display elements, the electrodes are preliminarily provided on the film substrate on the side to be drawn out toward the other substrate. Since a half-cut is performed to remove unnecessary portions of the film substrate at a time, a cutting process for forming individual liquid crystal display elements becomes easier than before.

(Example) Hereinafter, the details of the present invention will be described with reference to the drawings.

FIG. 1 is a view for explaining one embodiment of the present invention, and this embodiment will be described in accordance with the manufacturing process with reference to FIG. First, in FIG. 1 (a), a predetermined surface made of, for example, ITO (Indium Tin Oxide) is formed on one main surface of a pair of first and second film substrates (1) and (2) made of, for example, PET. Electrode patterns (3) and (4) are formed,
Further, alignment films (5) and (6) made of, for example, polyimide are formed so as to cover the upper surface thereof. Here, the substrate extension part (8) for securing the electrode extraction part (7) exists only on the first film substrate (1). The first and second film substrates (1) and (2) are arranged so as to face each other so that the electrode patterns (3) and (4) face each other, and a sealing agent as a partition (9) is interposed therebetween. By forming, the first and second film substrates (1) and (2) are adhered, and a plurality of element portions (10) each of which becomes a liquid crystal display element are set. Here, the element part (1
The portion serving as the liquid crystal injection port in (0) is left open with the partition (9).

FIG. 1 (b) is a schematic view of the first and second film substrates (1) and (2) at a stage where a plurality of, for example, six (to) element portions (10) are set. FIG. 1A is a cross-sectional view of the cross section taken along the line AA ′ of FIG. 1B viewed from the direction of the arrow. As can be seen from FIG. 1 (b), the element portion (10) is formed on the inner surface separated by a predetermined distance from the end portion (11) of the second film substrate (2). The two film substrates (1) and (2) have portions projecting from each other. And then,
The peripheral portion (12) showing the entire contour of the element portion (10) of the second film substrate (2) is subjected to half-cut from the second film substrate (2) side with a cutter blade or the like. Here, this half-cut is performed by cutting a portion (12) indicated by a dashed line in which only the second film substrate (2) is cut to leave the substrate extension portion (8).
In a), for example, from 1/2 or more of the second film substrate (2)
Each element is made up to a thickness of less than 2/3 (10)
First and second film substrates (1), (2)
Are cut through the second film substrate (2), for example, at a portion (12b) indicated by a solid line and cut to a thickness in the range of not less than 1/2 to not more than 2/3 of the first film substrate (1). Subsequently, in this state, the first film substrate (1) is fixed or has the protruding portion (1a), and the protruding portion (2a) as an end of the second film substrate (2) is held.
By peeling the second film substrate (2) in the direction opposite to the direction in which the first film substrate (1) exists,
Unnecessary portions of the film substrate (2) can be peeled off at once.

FIG. 1 (c) is a schematic view of the first and second film substrates (1) and (2) at the stage where only necessary parts of the second film substrate (2) are left in this way. Then, in FIG. 1 (c), the first film substrate (1) is cut along a cutting line (13) indicated by a chain line, which is three lines substantially parallel to the x direction and four lines substantially parallel to the y direction. By doing so, the plurality of element portions (10) are individually separated. Here, a cutting line (1) existing at the bottom of FIG.
3) is for cutting a substrate extension portion for securing an electrode extraction portion formed on the first film substrate (1) of the element portion (10) corresponding to,.

FIG. 1D is a cross-sectional view showing the liquid crystal display element at a completed stage, and the subsequent steps will be described with reference to FIG. After filling the gap between the first and second film substrates (1) and (2) with the liquid crystal (14) from the liquid crystal injection port described before the individually separated element portion (10), Is sealed.
The other principal surfaces of the first and second film substrates (1) and (2), on which the electrode patterns (3) and (4) are not formed, are respectively a polarizing plate (15) and a reflecting plate (16). And a polarizing plate (17). Thus, a desired liquid crystal display element is obtained.

In this embodiment, the element portion (10) is formed on the inner surface of the second film substrate (2) at a predetermined distance from the end (11), and the first and second film substrates (1) and (2) are formed. Before dividing, cut the periphery (12) in half,
After peeling off the second film substrate (2) from the end to leave only the necessary portion of the second film substrate (2), the first film substrate (1) is cut and separated into individual liquid crystal display elements. ing. As a result, since the peeling of the second film substrate (2) can be partially completed, the step of dividing the individual liquid crystal display elements is simplified as compared with the conventional case. In addition, the first and second
When arranging the film substrates (1) and (2) so as to face each other, one of the first and second film substrates (1) and (2) is projected from the other film substrate. Therefore, the unnecessary portion of the second film substrate (2) can be easily peeled off.

The half cut of the portion (12b) that cuts both the first and second film substrates (1) and (2) is, for example, in the range of not less than 1/2 to not more than 2/3 of the second film substrate (2). Although it may be up to the thickness, it is easier to cut the first film substrate (1) along the cutting line (13) later by cutting through the second film substrate (2) as in the above-described embodiment. . In addition, half cut is performed at present in a thickness of not less than 1/2 and not more than 2/3 of the first or second film substrate (1), (2). However, the present invention is not limited to this. Needless to say. Further, the second film substrate (2) is cut through in advance in FIG. 1 (b) through the portion of the cutting line (13) existing at the lowermost part substantially in parallel with the x direction in FIG. 1 (c). You may give a half cut.

[Effects of the Invention] The present invention can easily divide a plurality of integrated liquid crystal display elements into individual liquid crystal display elements by devising a cutting step in a manufacturing process of a liquid crystal display element using a film, Automation of this work can be achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view and a schematic view for explaining an embodiment of the present invention. (1) First film substrate (2) Second film substrate (3), (4) Electrode pattern (7) Electrode extraction part (8) Substrate extension part (9) ... Partition wall (10) ... Element part (11) ... End part (12) ... Peripheral part

Claims (2)

(57) [Claims] A pair of first and second film substrates on which a predetermined electrode pattern is formed are opposed to each other, and a barrier is formed between the pair of first and second film substrates. Forming a plurality of element portions on an inner surface separated by an interval; and a peripheral portion showing an entire contour of the element portion,
A step of performing a half-cut to a thickness of not less than 1/2 to not more than 2/3 of the second film substrate in a portion where only the film substrate is cut;
A step of cutting through the second film substrate in a portion where the film substrate and the second film substrate are cut together, and performing a half cut to a thickness of 1/2 or more to / 3 or less of the first film substrate; (2) a step of leaving only a necessary portion of the second film substrate by peeling off the film substrate from an end; and a step of cutting the first film substrate and separating the liquid crystal display elements into individual liquid crystal display elements. Manufacturing method of a liquid crystal display element. 2. A method according to claim 1, wherein a pair of said first film substrate and said second film substrate on each of which a predetermined electrode pattern is formed are opposed to each other, and a barrier is formed between the first film substrate and the second film substrate. The step of forming a plurality of element portions on inner surfaces separated by a predetermined distance includes a pair of the first film substrates on which a predetermined electrode pattern is formed such that one film substrate projects from the other film substrate. Forming a plurality of element parts on an inner surface separated by a predetermined distance from an end of the second film substrate by disposing the and the second film substrate to face each other and forming a barrier therebetween. The method for manufacturing a liquid crystal display device according to claim 1, wherein: