JPH0371692B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This 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) Prior art In general, in the manufacturing method of liquid crystal display elements, in order to increase mass production, a single liquid crystal cell is manufactured by forming a pair of elongated liquid crystal cell parts with a plurality of liquid crystal cell parts spaced apart from each other with a gap for an electrode extension part. A manufacturing method is used in which a substrate is cut into predetermined lengths in its longitudinal direction.
For example, as shown in Fig. 3, which shows an example of manufacturing a liquid crystal display element with a segment type display, in the past, very hard materials such as glass were used as the segment electrode substrate (SEG substrate) 10 and the common electrode substrate (COM substrate) 11. After bonding using a material, the SEG board has a notch for dividing the liquid crystal cell, and the COM board has a notch for dividing the liquid crystal cell and a notch for dividing the COM board, and by applying stress, the facing substrates can be separated. A method has been used to produce a plurality of single cells in which only one side is easily divided 13 and both sides are easily divided 12 to provide electrode lead-out portions 14.

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 it is an ultra-thin film (e.g. 0.1mm
It is possible to obtain a liquid crystal display element that does not break even when used in a wide range of viewing angles and has a wide viewing angle range.

(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 is true even when epoxy resin film, which is relatively hard among plastics, is used. Therefore, in the method of manufacturing liquid crystal cells using plastic film as a substrate, it is difficult to directly use long substrates to manufacture a large number of cells, and before bonding a pair of film substrates together, electrodes are formed as shown in FIG. In order to secure the pull-out portion 14, it is necessary to divide it into small pieces, which makes it difficult to increase mass productivity after the bonding process.

In view of the above circumstances, the inventor of this invention conducted extensive research and found that a plastic substrate made of a hard film laminated with a soft film was used, and before bonding both substrates together, the hard film of the substrate was placed in a predetermined position. The inventors discovered that a plurality of plastic liquid crystal display elements can be easily manufactured using a long plastic substrate by making cuts in the substrate, and have completed the present invention.

(d) Means for solving the problem According to the present invention, a pair of elongated substrates having a predetermined transparent conductive film pattern at a predetermined interval are arranged facing each other, and a number of partition walls are installed between them. The method consists of setting a plurality of liquid crystal cell sections, and then dividing the pair of substrates and separating each cell section to produce a liquid crystal cell having a substrate extension section on one side for securing an electrode lead-out section. A plastic film in which a soft film is laminated onto a hard film is used as a substrate for the substrate, with the hard film surfaces facing each other, and only the hard film layer of the substrate is provided with cuts corresponding to the substrate cutting position and the extension of the substrate. A cut is made in advance for removing the facing portion, and after the liquid crystal cell portion is set, the soft film layer of the substrate made of the plastic film is cut off along the cut in the hard film layer, thereby separating the liquid crystal cell portion and unnecessary portions of the substrate. Provided is a method for manufacturing a liquid crystal display element, characterized in that a plurality of liquid crystal cells each having a substrate extension portion for securing an electrode extension portion on one side of the substrate is obtained by removing 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-mentioned resin include epoxy resin, polycarbonate, polysulfone, etc., and epoxy resin is preferable from the viewpoint of breakability 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), polyether sulfone (PES), polyvinyl alcohol ( PVA), etc.

The substrate used in this invention is one in which the above-mentioned hard film is laminated with the above-mentioned soft film, and it is suitable that the film thickness is equal to or smaller than that of the plastic substrate used in ordinary liquid crystal cells. 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, the plastic film substrate of the present invention is usually suitable to have a thickness of 0.08 to 0.2 mm, and preferably has a hard film layer of 0.07 to 0.18 mm.
The thickness of the soft film layer is preferably thick enough to have sufficient strength to hold the divided hard films together, and thin enough not to prevent separation. 0.01~ for soft films made of the above materials
It is suitable to use one with a film thickness of 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 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 the present invention, before a pair of laminated plastic film substrates are bonded together and a number of partition walls are installed therebetween by a conventional method to form a liquid crystal cell section, predetermined positions on each substrate are placed in the width direction of the laminated plastic film substrates. , incisions are made only in the hard film layer.

The above cut is made at a position where a pair of substrates are separated, that is, a position where adjacent liquid crystal cell sections can be separated individually, and a substrate extension for securing an electrode lead-out section at one of the separated liquid crystal cell sections. A suitable position is where the extension (unnecessary part) of the other board facing the part 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 bent by applying bending stress to each of the cut positions. Cuts are made only in the film, and then the hard films are placed so as to face each other, and a number of cell partition walls (sealing materials) are placed between them at predetermined positions 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.

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

As shown in Fig. 1, the pair of plastic film substrates 3, 3' used are hard films 2, 2' made of epoxy resin (film thickness 0.1 mm) and PVA.
Soft film made of resin (film thickness 0.03mm) 1,1'
It is laminated with.

Before bonding both substrates 3 and 3' together, after printing a predetermined transparent conductive film pattern at a predetermined interval, first, a segment electrode SEG substrate 3' which requires a substrate extension part 8 for securing an electrode lead-out part is printed. In , the positions 5', 6', .
A cut is made only in the hard film layer 2', and a bending stress is applied to the cut to form cuts 5' and 6' only in the film layer 2'. On the other hand, on the opposing common electrode COM substrate 3, a hard film layer 2 is placed at a position opposite to the cuts 5' and 6' and at a position where unnecessary parts of the substrate can be removed, which is opposite to the board extension part 8 for securing the electrode lead-out part. A cut is made in the chisel, and bending stress is applied to the film layer 2.
Cuts 5, 6, and 7 are created in the chisel.

A pair of SEG substrates 3' and COM substrates 3 with only such hard film layers separated at desired positions.
are arranged so that their hard film layers 2'2 face each other as shown in FIG. 1, and a sealing material 4 is placed between them for sealing. Thereafter, by cutting the soft film layers 1, 1' along each of the cuts 5, 5', 6, 6', and 7, an electrode lead-out part is secured as shown in FIG. 2, and a clearance between both substrates 3, 3' is obtained. A plurality of segment type display liquid crystal cells 9 with a diameter of about 10 μm were obtained.

(g) Effects of the invention According to the method of the invention, it is possible to perform the bonding process, liquid crystal injection, and sealing process using a large (long) substrate without cutting the plastic film substrate into small units or individually. It is possible to increase mass productivity.

[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'...PVA resin soft film layer,
2, 2'...Epoxy resin hard film layer, 3
...Plastic film board for COM, 3'...
Plastic film substrate for SEG, 4...Sealing material, 5, 5', 6, 6', 7...Hard film layer separation line, 8...Substrate extension for securing electrode extraction section, 9...Liquid crystal display Element, 10... SEG substrate,
DESCRIPTION OF SYMBOLS 11... COM board, 12... Liquid crystal cell dividing line, 13... COM board dividing line, 14... Electrode lead part, a... Spacing for securing electrode lead part, b...
Spacing for liquid crystal cell part.

Claims (1)

[Claims] 1. A pair of elongated substrates having a predetermined transparent conductive film pattern at a predetermined interval are placed facing each other, a number of partition walls are installed between them, and a plurality of liquid crystal cell sections are set. By cutting a 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, and a soft film is laminated on a hard film as the pair of substrates. Use the plastic films prepared in such a way that these hard film surfaces face each other, and provide in advance cuts corresponding to the substrate cutting position and cuts for removing the opposite portion of the substrate extension portion only in the hard film layer of the substrate. 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 cutting off the liquid crystal cell part and removing unnecessary parts of the substrate, and drawing out electrodes on one side of the substrate. 1. A method for manufacturing a liquid crystal display element, which comprises obtaining a plurality of liquid crystal cells each having a substrate extension for securing a 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 soft film is made of polyethylene terephthalate, polyvinylidene chloride, polyether sulfone, or polyvinyl alcohol.