JPS6292916A - Production for liquid crystal display element - Google Patents

Abstract

PURPOSE:To make it possible to use a long-sized substrate by using a plastic substrate where a soft film is laminated on a hard film and notching only the hard film in prescribed positions before sticking both substrates. CONSTITUTION:Soft films 1 and 1' are laminated on hard films 2 and 2' to obtain a pair of plastic substrates 3 and 3'. Before substrates 3 and 3' are stuck to each other, only the layer 2' of the substrate 37 for segment electrode is notched in positions 5', 6'... where the substrate is separated with an interval (b) for liquid cell part including an interval (a) for electrode leading-out part as one unit, and bending stress is applied to generate cuts 5', 6''. Only the layer 2 of the substrate 3 for common electrode is notched in positions where unnecessary parts of the substrate are cut off, and cuts 5, 6, and 7 are generated only in the layer 2. A pair of substrates 3 and 3' are so arranged that layers 2 and 2' face each other, they are sealed with a seal material. Layers 1 and 1' are separated along cuts 5, 5', 6, 6', and 7 to obtain plural liquid crystal cells for segment display.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a method for manufacturing a liquid crystal display element.

More specifically, the present invention relates to a method for manufacturing a liquid crystal display element suitable for efficiently manufacturing a plurality of single liquid crystal cells.

(B) Conventional technology In general, in the manufacturing method of liquid crystal display elements, a single liquid crystal cell is formed in a pair of elongated sheets in which a plurality of liquid crystal cell parts are formed with a gap for an electrode lead-out part in order to increase productivity. A manufacturing method is used in which a shaped substrate is cut into predetermined lengths in its longitudinal direction.

For example, as shown in Fig. 3, which shows an example of manufacturing a segment-type liquid crystal display element, conventionally, segment electrode substrates (S
EG board) Oo) and common electrode board (00M board)
After bonding using a very hard material like glass as Gυ, the 5EGI board has a cutout for dividing the liquid crystal cell, and a
The 0M substrate has a notch for dividing the liquid crystal cell and a notch for dividing the COM board, and by applying stress, only one side of the facing substrate can be easily divided ('131). A method of producing a plurality of single cells provided with drawer portions (14) has been used.

On the other hand, plastic liquid crystal display elements using plastic substrates have been actively developed in recent years. The advantage of this is that even if an ultra-thin film (for example, about 0.1 mm) is used, it will not break and a liquid crystal display element with a wide viewing angle range can be produced.

(c) Problems to be Solved by the Invention However, plastic is flexible, and even if a notch is made, it cannot be easily divided by applying stress like glass. In particular, it is extremely difficult to separate only one side of the bonded substrates in order to secure the electrode lead-out portion. This also applies to the use of epoxy resin film, which is relatively hard among plastics. Therefore, as a manufacturing method for liquid crystal cells using plastic film as a substrate, it is difficult to directly use long substrates to manufacture a large number of cells. In order to secure the part 041, it was necessary to separate the parts into smaller sizes, which made it difficult to increase mass productivity after the bonding process.

In view of the above circumstances, the inventor of this invention conducted intensive research and found that a plastic substrate made of a hard film laminated with a soft film was used, and that only the hard film of the substrate was predetermined before bonding the two plates together. The present inventors have discovered that a plurality of plastic liquid crystal display elements can be easily manufactured using a long plastic substrate by making cuts at these locations, and have completed this invention.

(d) Means for solving the problem According to the present invention, a pair of elongated substrates each having a predetermined transparent conductive film pattern at a predetermined interval are arranged facing each other,
A liquid crystal cell that has a substrate extension part on one side for securing an electrode pulling part by installing a number of partition walls between them, setting up a plurality of liquid crystal cell parts, and then dividing the pair of substrates and separating each cell part. As the pair of substrates, a plastic film in which a soft film is laminated to a hard film is used so that the hard film surfaces face each other, and only the hard film layer of the substrate is coated at the substrate separation position. By providing in advance a corresponding cut and a cut for removing the opposing portion of the substrate extension part, and cutting off the soft film layer of the substrate made of the plastic film along the cut in the hard film layer after setting the liquid crystal cell part, Provided is a method for manufacturing a liquid crystal display element, which comprises separating a liquid crystal cell portion and removing an unnecessary portion of the substrate to obtain a plurality of liquid crystal cells each having a substrate extension portion for securing an electrode extension portion on one side of the substrate. .

The hard film used for the substrate of this invention may be a thermosetting resin as long as it has good light transmittance (80% or more), relatively heat resistance (100°C or more), moisture absorption resistance, chemical resistance, etc. It may also be a thermoplastic resin. Examples of the above resin include epoxy resin, polycarbonate,
Examples include polysulfone, and epoxy resins are preferred from the viewpoint of splitting properties and solvent resistance.

On the other hand, suitable soft films have good light transmittance, moisture absorption resistance, and solvent resistance, such as polyethylene terephthalate (PET), polyvinylidene chloride (PVDC), and polyether sulfone (PES).
, polyvinyl alcohol (PVA), and the like.

The substrate used in this invention is one in which the above-mentioned soft film is laminated to the above-mentioned hard film, and the thickness of the film is preferably equal to or smaller than that of the plastic substrate used in ordinary liquid crystal cells. Therefore, it is preferable to use a material that is as thin as possible within the range of mechanical strength and physical and chemical properties.

In the laminate layer, the thickness of the hard film is preferably larger than that of the soft film. For example, it is suitable for the plastic film substrate of the present invention to have a film thickness of usually 0.08 to 0.2 mm, of which the hard film layer has a thickness of 0.07 to Q, 18 m.
It is preferable to have a film thickness of l. The thickness of the soft film layer is preferably thick enough to have sufficient strength to hold the divided hard fins together, and thin enough not to prevent them from being pulled apart. It is suitable to use a soft film made of the above material with a thickness of 0.01 to 0.05 mm.

The substrate used in this invention is long enough to divide a plurality of liquid crystal cells in its longitudinal direction, and its length is selected depending on the number of liquid crystal cells intended to be manufactured.

A transparent conductive film pattern corresponding to the display pattern of the liquid crystal cell is printed on each hard film layer of the above-mentioned pair of substrates, and a plurality of these patterns are set in the longitudinal direction with intervals for securing the electrode extraction part. ing.

According to this invention, before bonding the pair of laminated plastic film substrates together and installing a large number of partition walls between them using a conventional method to form a liquid crystal cell section, each substrate is in advance placed at a predetermined location in its width direction. Incisions are made only in the hard film layer.

The position at which the above cut is made is the position where a pair of substrates are separated, that is, the position where adjacent liquid crystal cell parts are individually cut off, and the position where the substrate is extended to secure an electrode lead-out part in one of the separated liquid crystal cell parts. A suitable position is where the extending portion (unnecessary portion) of the other substrate facing the extending portion can be removed.

(e) Effect: As described above, a pair of long soft film hard film laminate substrates in which cuts have been made in the width direction at predetermined positions only in the hard film layer are applied bending stress to each of the cut positions. Cuts are made only in the hard film, and then the hard films are placed so as to face each other, and a number of cell partition walls (sealing materials) are installed at predetermined positions between them and bonded together. After that, by tearing or separating the soft film along the above-mentioned cuts, unnecessary parts are removed from one substrate side, and a plurality of single liquid crystal cells having a substrate extension part for securing an electrode lead-out part can be obtained. Become.

The present invention will be described in detail below based on the embodiments shown in FIGS. 1 and 2, but the present invention is not limited thereby.

Embodiment FIGS. 1 and 2 show an embodiment of a method for manufacturing a segment type liquid crystal display element according to the method of the present invention.

As shown in Figure 1, the pair of plastic film substrates (3) (3') used are a hard film made of epoxy resin (film thickness 0.1 mm) (2) and a soft film made of PVA resin (2). Film thickness 0.03 mm) [I
H1') is laminated.

Before bonding both substrates (31 (3') together, predetermined transparent conductive film patterns are printed at predetermined intervals, and then segment electrodes (which require substrate extensions (8) for securing electrode lead-out portions) are first printed. In the board mark for SEG), a hard film layer is placed at the position f5'l (6'l... A cut is made in the chisel and bending stress is applied to the chisel to create a cut (50
cause ω. On the other hand, in the opposing common electrode (COM) substrate (3), the above-mentioned cut (51
'll f Make a cut only in the film layer (a) at a position where unnecessary parts of the board can be removed, and then apply bending stress to make a cut f51 only in the film layer (2).
(6) causes (7) to occur.

A pair of SEG substrates and COM substrates with only the hard film layers separated at desired positions are arranged so that the hard film layers o'+ +2) face each other as shown in Figure 1. A sealing material (4) is placed on and sealed. Each cut +5] (5') f61 [ω
(By separating the soft film layer (1) (11') along the blade, an electrode lead-out part is secured as shown in Figure 2, and both substrates (3) (segment type display with group clearance of approximately 10μ) A plurality of liquid crystal cells (9) were obtained.

(G) Effects of the Invention According to the method of the invention, the bonding step can be carried out without separating the plastic film substrate into small units or individually.
The liquid crystal injection and sealing steps can be performed using a large (long) substrate, and mass productivity can be improved.

[Brief explanation of drawings]

FIG. 1 is a structural explanatory diagram showing one embodiment of the present invention, FIG. 2 is a structural explanatory diagram of a liquid crystal display element according to the present invention, and FIGS. 3 and 4 are diagrams corresponding to FIG. 1 of a conventional example. +1) (1'l...PVA resin soft film layer, (2 forces...epoxy resin hard film layer, (3)...Plastic film substrate for COM , (q... SEG plastic film substrate 4)... Seal material, (5) (mark [6) (6') [7)... Hard film layer Parting line, (8)...Substrate extension for securing electrode lead-out section, (9)...Liquid crystal display element, ω)...SEG substrate, 01)・・・・・・
00M substrate, az...Liquid crystal cell separation line,
O3)...COM board separation line, M)...
... Electrode extraction part, (J... Spacing for securing Ti commutator electrode extraction, +b+... Spacing for liquid crystal hill part. Fig. 1 Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Claims] 1. A pair of long substrates having a predetermined transparent conductive film pattern at a predetermined interval are arranged facing each other, a number of partition walls are installed between them, and a plurality of liquid crystal cell portions are set; By dividing this pair of substrates and separating each cell part, a liquid crystal cell having a substrate extension part for securing an electrode lead-out part on one side is produced. A laminated plastic film is used so that these hard film surfaces face each other, and a cut corresponding to the board cutting position and a cut for removing the opposite part of the board extension part are made in advance only on the hard film layer of the board. After setting the liquid crystal cell part, the soft film layer of the plastic film substrate is cut off along the cuts in the hard film layer, thereby separating the liquid crystal cell part and removing unnecessary parts of the substrate, and forming an electrode on one side of the board. A method for manufacturing a liquid crystal display element, comprising obtaining a plurality of liquid crystal cells each having a substrate extending portion for securing a drawer portion. 2. The method according to claim 1, wherein the hard film is made of epoxy resin. 3. The method according to claim 1, wherein the flexible film is made of polyethylene terephthalate, polyvinylidene chloride, polyether sulfone, or polyvinyl alcohol.