JPS60159826A - Electrooptic display element - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Both plates having a liquid crystal layer between them form a cell surrounded by an edging, and a conductive spacer present in said edging is connected between two opposing electrodes. It relates to electro-optic display elements in which electrical connections are present.

Appropriate electrodes are required on the two plates to control the electro-optic display. Generally, a control electrode is located on one plate and a conventional counter electrode is located on the other plate. The plates are separated by an edging that surrounds the liquid crystal material with them.

The thickness of this etching and thus the thickness of the liquid crystal layer is adjusted by the intervention of a spacer. These are particles with geometrical dimensions defined as precisely as possible. Cut glass fiber (West German Published Patent Application No. 3,215,492)
Spherical particles of silica gel or spherical particles of aluminum oxide have been found suitable for this purpose. The two plates are then separated.

In manufacturing electro-optic display elements, there is currently a problem of making electrical connections between a plate with control electrodes and external electrical connections and a counter electrode on the other plate.

Suitable electrodes are located opposite each other on the plate, and the connection of these electrodes is effected by means of electrically conductive metal wires. A disadvantage of this display is that the possible etching shapes or plates with counter electrodes are limited. In addition, the manufacture of such displays is complicated due to the application of high-strength, and when a large number of counter electrodes are present on one plate, as is required for multiple operation of the display. Especially so.

A surface having a rectangular profile and whose surface may also be electrically conductive is disclosed in West German Published Patent Application No. 2.931,11.
As known from No. 3, sheets with a rectangular profile are not only extremely difficult to produce in a defined manner but also tend to overlap during the pressing operation.

The object of the invention is to provide a method for manufacturing electro-optical displays that avoids this known drawback.

This objective was achieved by using a suzusa having a circular cross section and being electrically conductive.

Surprisingly, a strip R with circular cross section and electrical conductivity
-Sa has already found that it is possible to create a quite sufficient electrical connection between two plates by contacting them along their surfaces. In addition, they do not overlap during pressing operations, are easy to manufacture in defined dimensions, and have sufficient mechanical stability. f, ie no contrast loss occurs in the display element.

Thus, the present invention provides a method for electro-optic display elements having circular cross-sections and conductive strips and a cover plate in an electro-optic display element, either alone or together with non-conductive strips. Regarding use between the base plate and the base plate.

The invention further comprises a liquid crystal layer between the cover plate and the base plate forming a closed cell with the edging, the edging containing electrically conductive spacers having a circular cross-section creating an electrical connection between the opposing electrodes. It also relates to an electro-optic display element, and the manufacture of said electro-optic display element by applying an edging as a conductive silicon-containing adhesive to at least one of said plates and then pressing the plates together. It also relates to methods.

Basically, it has a circular cross-section and approximately uniform geometric dimensions, either due to its geometry (e.g. beads) or its material properties (
Any material can be used as a spacer, provided that the breakage of glass fibers that are present on top of each other, for example, eliminates the uneven spacing of the particles during the pressing operation. It is preferable to use an elliptical, spherical or cylindrical shape.

Cut fibers are particularly preferred. The geometric dimensions of
It is selected such that it has an etching layer thickness of 2 to 20 μm, preferably 7 to 15 μm. When using cut fibers, 2 to 20 ttm, preferably 5 to 15μ
m and a diameter in the range of 6 to 12 μm is selected for the bamboo. The length of the cut I & fiber is preferably 100μm or less, and 5~
A range of 50 μIη is particularly preferred.

Possible phase materials for the sweep are both electrical conductors, such as metals or carbon, and non-conductors, such as glass, quartz, silica gel or aluminum oxide, covered with a conductive layer.

Essentially, all 43 materials that produce conductive coatings are
A spacer which is not conductive by itself is suitable as a spacer. For example, it can be used as an analogy or as an example. Such coatings can be applied from solution by methods described in the literature, or by methods such as &':j, vacuum evaporation, cathodic atomization or CVD (chemical vapor deposition). This is also particularly suitable since it already has good electrical conductivity as a gold 1 < bs N coating, so that the coating only changes the dimensions of the spacer by a negligible amount. Particularly preferred metals are, for example, silver, copper or (
It has extremely good conductivity, such as nickel. Also preferred are metals that can be deposited by simple chemical methods, such as by applying an electric current. The thickness of such metallization bears between 10 and 500 nm, preferably 50 nm.
~150 n■1 can be made into a force of 1.

When using -sa for cylindrical S (well, 4'A' characteristics (
For example brittle), these suberaphite fibers during pressing operations, carbon fibers (yo' electrical conductivity I11. subjected to 4y o tongue: the glass with +&#dli is obtained from +&#dli, the cut edges &l
It is preferable to use l as a -sa, if glass fiber, this coating should be applied to the desired length. I can do it.

Mino, 4 sexual smoothies are also &1 non'1U only by them
,, Electro-optic display elements along with varnish
Inserts between the Kutzl plate and the base plate,
Ru.

Preferably, Suζ-zu-QmaJ concubine Qi 1 according to the present invention
and the adhesive f is applied to at least one of the two plates of the electro-optic display element. The plates are then crimped together to form a conductive connection between the opposing electrodes.

The relationship between the conductive substrate and the electrode surface must be selected so as to ensure a conductive connection between the electrodes. This relationship is preferable (01 to 100 x
10-6t/cm2, especially 05~50X10-67Δ
〃z2.

The total amount of conductive and non-conductive metal must ensure a constant distance between the two plates. That's 10
-100X, preferably in the range of 10-6 to 10n2.

The method of the present invention makes it possible to save one work step when manufacturing a display device.

The present invention will be explained in more detail using an embodiment shown in the drawings.

It is assumed that the plate 1 is transparent and has display means 7 and its control electrode is connected to an external electrical connection B. In the area of the display means 7, the other plate 2 has a counter electrode 8 connected to the electrode 5. Plate 1 has electrode 4 opposite electrode 5 .

The frame 6 is applied to the plate 1 or 2 in the form of an adhesive containing electrically conductive glass fibers. Cut glass fibers (length = 1-50 μm, diameter:
10 μm・) is used. The cut glass fiber is 0.5
Used in an amount of X 10-697 cm2. By pressing the plates 1 and 2 together, cells 9 are formed between the plates, the boundaries of which are formed by the edging 6, ie the adhesive layer.

The parallel position of the plates 1 and 2 relative to each other is ensured by adhesive or by glass fibers in the enring 6, and the spacing between the plates corresponds to the diameter of the glass fibers. This is because glass fibers are brittle and will break if they overlap each other during a pressing operation. By suitable design of the electrodes 4 and 5 and a suitable mixing ratio of adhesive and glass fibers, a perfect electrical connection between the two electrodes is achieved after pressing. Place the uncoated glass fiber inside the cell 9.
In that case, both the coated glass fibers #f and the uncoated glass fibers act as a strainer. Such display elements exhibit no loss of contrast even after relatively long periods of operation.

In another embodiment of the same design, glass fibers provided with a conductive coating are used in a mixture with 50 M weight of uncut, cut glass fibers.

The electro-optic display element thus obtained has a complete electrical connection between the two opposing electrodes.

[Brief explanation of the drawing]

The figure shows an embodiment of the invention. 1.2...Plate, 6...Edging, 4,5...
・Electric camellia, 7. Display means, 9. Cell.

Claims (1)

[Scope of Claims] 1) A slider for an electro-optical display element, characterized in that it has a circular cross section and is electrically conductive. 2) A spacer for an electro-optic display element having a circular cross-section and having electrical conductivity is used by itself or together with a non-conductive spacer between a cover plate and a base plate in an electro-optic display element. Features an electro-optical display element. 3) An electro-optical display element having a liquid crystal layer between a cover plate and a base plate forming a sealed cell together with an edging, and having an electrical connection between opposing electrodes, wherein the edging is defined in claim 1. An electro-optical display element characterized in that it contains a surface resistor. 4) An electro-optical display element according to claim 6, comprising applying the edging as a sulfur-containing adhesive to at least one of the two plates and then crimping the two plates together. A method for manufacturing an electro-optical display element, characterized in that a spacer having a circular cross section and electrical conductivity is added to the adhesive.