JPS6148690B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an electro-optical display cell such as liquid crystal or electrochromism.

Among electro-optical display cells, liquid crystal display cells are being widely put into practical use as display devices for electronic watches, calculators, and meters. I will explain.

As the range of applications for liquid crystal display cells expands, there is a growing demand for inexpensive cell manufacturing technology. Conventionally, the manufacturing method for this purpose has been to fabricate multiple opposing electrode patterns on a pair of glass substrates. After arranging them and assembling them with adhesive or fritted glass and spacers, injecting liquid crystal between the substrates and sealing the injection hole with adhesive, soft metal such as indium, or solder, etc. Furthermore, the so-called multi-piece manufacturing method, in which the display cells are divided into individual display cells to produce a completed display cell, has been widely used and has been effective in reducing costs to some extent.

The manufacturing method will be briefly explained below with reference to the drawings. Figures 1a and 1b show plan views of a pair of glass substrates 1 and 2 arranged in a pattern to obtain four completed cells.

FIG. 2 shows a side view after assembly is completed. The display electrode pattern 3 and the common electrode pattern 4 are formed by vapor deposition, sputtering, or sputtering of tin oxide or indium oxide.
It is formed by a CVD method or the like, and the film side of the glass is subjected to alignment treatment so that liquid crystal molecules are aligned in a desired direction.

Adhesive or glass frit 5 is printed on one side of these substrates, the two substrates are overlapped and fired at a temperature higher than the curing temperature of the adhesive or the melting point of the glass frit, and then liquid crystal is injected through the injection hole 6. death,
The injection hole 6 is sealed with soft metal, adhesive, solder, etc., and the assembly is completed.

After that, the positions of the as shown in Fig. 2 are sliced with a diamond blade, or
Individual cells were completed by cutting and separating using one or multiple cemented carbide rollers.

Although these manufacturing methods were highly effective and greatly reduced costs compared to the previous method of starting the process from the beginning with a single piece of glass, they also had the following drawbacks: I was dissatisfied.

FIG. 3 shows an assembled side view of a conventional liquid crystal display cell in which grooves have been previously formed in the cut portion by slicing.

First, in slicing using a diamond blade, when cutting off the unnecessary portion 7 in FIGS. 1, 2, and 3, the cutting depth accuracy is greater than the distance between the bonded pair of substrates, so the display electrode In order to cut off the unnecessary portion 7 without damaging the pattern, it was necessary to cut a groove 8 of an appropriate depth in advance on the inner side of the bonding surface, as shown in FIG.

Another drawback is that the unnecessary portion 7 is scattered during processing, damaging the diamond blade and causing scratches on the product, resulting in a decrease in yield.

Next, in scribing using the cemented carbide roller 9 at one point or multiple points as shown in FIG. There is a need to. For this reason, scribe line 11
, the cemented carbide roller 9 is attached to the glass substrate 10
At the end 12 where the crack enters (hereinafter referred to as the inlet end), the cemented carbide roller runs over it, and this shock disturbs the direction in which the crack travels, making it difficult to improve dimensional accuracy and also causing the glass substrate 10 to chip. This was causing a decrease in yield.

Similarly, at the outlet end 13, the yield was also reduced, such as chipping of the glass substrate 10 and reduction in dimensional accuracy. However, in the middle part of the scribe line other than the inlet end 12 and the outlet end 13, no chips occur and sufficient dimensional accuracy can be achieved.

The present invention aims to provide a spacer that eliminates the drawbacks of conventional methods, improves the yield of cutting operations, saves on consumables such as glass and diamond blades, and achieves significant cost reductions. It is.

The present invention will be described below with reference to drawings showing embodiments. FIG. 5 is a sectional view showing scribe locations in an embodiment of the present invention. FIG. 6 is a plan view a showing an embodiment of the present invention and a side view b showing a broken surface.

First, a plurality of opposing electrode patterns are arranged on a pair of glass substrates 14 and 15 using a method similar to the conventional method, and after assembling them with adhesive or fritted glass and a spacer, the substrate 1
Liquid crystal is injected between holes 4 and 15, and the injection hole is sealed with an adhesive, a soft metal such as indium, or solder.

Thereafter, the positions of S to D shown in FIG. 5 are scribed. At this time, as shown in FIGS. 6a and 6b, the inlet end 17 and outlet end 18 of the scribe line 16 are not touched by the cemented carbide roller, and the glass substrates 14 and 1 to be cut are cut.
Scribing is started in the middle of step 5, and completed before reaching the exit end 18, and the cemented carbide roller is separated from the glass substrate. Thereafter, by applying a slight external force in the bending direction or thermal shock, the inlet end 17 and the outlet end 18 can be easily broken.

In this way, by leaving the inlet and outlet ends and scribing, it is possible to break the glass substrate individually without causing any disturbance of the cracks at the inlet or outlet ends, and without causing any chipping of the glass substrate. It can be divided into display cells.

The present invention can also be applied to a method in which individual liquid crystal cells are obtained by scribing in advance from the electrode pattern side, overlapping both substrates, and then cutting.

As described above, by leaving the inlet and outlet ends intact when scribing, the characteristics of the scribe, such as dry cutting and high speed, can be utilized to the fullest, making electro-optical display cells such as liquid crystal display cells more efficient. It can be manufactured better and cheaper.

[Brief explanation of the drawing]

Figures 1a and b are plan views showing a pair of glass substrates in a conventional method for manufacturing a liquid crystal display cell, Figure 2 is a side view after the assembly of Figure 1 is completed, and Figure 3 shows the cut portion by slicing. FIG. 4a is a plan view showing a scribe line by a conventional scriber, FIG. 4b is a side view showing the scribe surface of FIG. A cross-sectional view showing the scribe location in the example,
FIG. 6a is a plan view of a scribe line showing an embodiment of the present invention, and FIG. 6b is a side view showing the scribe surface of a. 1, 2, 10, 14, 15...Glass substrate, 9...
Cemented carbide roller, 11, 16... scribe line, 12, 17... inlet end, 13, 18... outlet end.

Claims (1)

[Claims] 1 Manufacturing of an electro-optical display cell by assembling a pair of glass substrates having electrode patterns for a plurality of pieces to integrally form a plurality of electro-optical display cells, and then dividing into individual display cells by scribing. A method for manufacturing an electro-optical display cell, characterized in that when dividing the display cell, scribing is performed leaving an entrance end and an exit end of the scribe line.