JPS5832688B2 - Denkiyokukiban - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrode substrate constituting an electro-optical display.

Electro-optical displays, such as liquid crystal displays, have liquid crystal sealed between a pair of electrode substrates, and a voltage is applied between the electrodes of the electrode substrates to display optically displayed characters, numbers, etc. on the outside. This is something that can be visually recognized from.

Therefore, it is necessary to improve the light transmittance of the display as a whole.
In other words, it is necessary to make the substrate and electrodes constituting the electrode substrate as difficult to see as possible.

For this reason, the substrate and electrodes of the electrode substrate are each made of a transparent material. For example, the substrate is made of glass, the electrode is made of a transparent conductive material such as tin oxide or indium oxide, and this electrode is formed by sputtering. It is attached as a thin film on a substrate using a vapor deposition method or the like, and the desired shape is obtained by etching or the like.

However, with this type of electrode substrate, defects such as short circuits, disconnections, and pinholes that occur in the electrode are inspected during the electrode formation process by sputtering, vapor deposition, and etching. Because it is transparent, the presence of defects is obscured and difficult to detect visually.
Inspections are performed using precision optical equipment such as microscopes.

Furthermore, when assembling a liquid crystal display by combining two electrode substrates, it is necessary to align the electrodes of each electrode substrate with each other, but since each electrode is transparent, the presence of each cannot be confirmed. Visual positioning is difficult, and a precise optical machine is used in the same way as when inspecting electrode defects.

The present invention has been made in view of the above points, and provides an electrode substrate that allows inspection of the electrodes of the electrode substrate and alignment of the electrodes without using a precision optical machine such as a microscope. be.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, 1 indicates one electrode substrate provided on the top of the liquid crystal display, 2 indicates the other electrode substrate provided on the bottom, and one electrode substrate 1 has an electrode 4 on the bottom surface of a rectangular substrate 3. On the other electrode substrate 2, an electrode 6 is similarly attached to the upper surface of a rectangular substrate 5.

The substrates 3 and 5 of these electrode substrates 1 and 2 are made of a transparent and insulating material, such as glass.

The electrodes 4 and 6 are made of a colored conductive material that becomes transparent when heated, such as indium sulfide InS.
(When colored, it is dark brown).

Then, a thin film of indium sulfide (InS) is deposited on the substrates 3, 5 by means such as sputtering or vapor deposition, and colored electrodes 4, 6 are formed by shaping into the desired shape by etching or the like. There is.

Colored electrodes 4 of electrode substrates 1 and 2 manufactured in this way
When inspecting defects such as short circuits, disconnections, and pinholes that occur in electrodes 4 and 6, since the electrodes 4 and 6 are colored, the presence of these defects can be detected by changes in the light beam (conditions such as color shading).
It can be distinguished more clearly than K.

Therefore, this defective location can be easily inspected by visual inspection, a simple projector, or other means.

Then, as shown in FIG. 2, the electrode substrates 1, 2 are arranged so that the electrodes 4.6 face each other and
, 50, a spacer 7 is interposed between the peripheral edges to maintain a spacing of about 10 μm.

In this step, the electrodes 4 and 6 of the electrode substrates 1 and 2 are aligned so that they have a predetermined positional relationship with each other.

In this case, since the electrodes 4.6 are colored, it is possible to clearly distinguish between misalignment and coincidence of the electrodes 4.6.

For this reason, electrode 4. ．． 6 can be easily aligned visually or by using a simple projector.

Next, 50 ml was applied to the two electrode substrates 1 and 2 and the spacer 7.
The electrode substrate 1.2 and the spacer 7 are bonded together by heating to about 0° C. and pressing the substrates 3 and 5 against the spacer 7.

When the electrodes 4 and 6 are heated, the colored idium sulfide InS, which is the material of the electrodes 4 and 6, decolorizes and changes into transparent indium oxide In2O.

In other words, the electrodes 4 and 6 are decolored from colored to transparent and transparent electrodes are obtained.

Note that when heating is performed, since the indium sulfide InS of the electrodes 4 and 6 generates a gaseous compound SO2, it is desirable to perform evacuation.

Finally, as shown in FIG. 3, liquid crystal 8 is sealed inside the space surrounded by the two electrode substrates 1.2 and spacer 7, and a liquid crystal display is assembled.

At this point, electrodes 4 and 6 are already transparent electrodes,
It has a function for liquid crystal display.

The electrode substrates 1 and 2 thus formed have transparent substrates 3 and 5 and transparent electrodes 4 and 6, and maintain sufficient transmittance as a liquid crystal display.

Note that an electrode substrate having a colored electrode may be used for only one side during alignment, and this electrode substrate can be widely applied not only to liquid crystal displays but also to the manufacture of other electro-optic displays.

Furthermore, in addition to indium sulfide, various colored conductive materials such as indium hydroxide In(OH)3, which have a property of decolorizing and becoming transparent when heated, can be used.

As described above, the present invention is not limited to the embodiments described above, and can be implemented with various modifications without changing the gist thereof.

As explained above, the present invention involves forming an electrode made of a colored conductive material on a transparent substrate, which has the property of decolorizing and becoming transparent when heated, so that defects in the electrode that occur during the manufacturing process of the electrode can be inspected. , and the positioning of each electrode of the two electrode substrates can be easily performed, which is highly effective in improving workability and quality in the manufacturing process.

[Brief explanation of the drawing]

FIGS. 1 to 3 are explanatory diagrams each showing an embodiment of the method for manufacturing an electrode substrate of the present invention, and showing the order of manufacturing steps for a liquid crystal display. 1.2...electrode substrate, 3,5...substrate, 4,6...
·electrode.

Claims (1)

[Claims] 1. An electrode substrate characterized in that a transparent substrate is formed of an insulating material, and an electrode containing a colored conductive substance that has the property of decolorizing and turning transparent by heating is attached to the substrate.