JPH04307519A - Liquid crystal 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]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for maintaining a gap between substrates of a liquid crystal display element using flexible substrates.

0002

[Prior Art] Conventionally, the gap between the substrates of a liquid crystal display element using a flexible substrate such as a plastic film has been maintained as shown in FIG.
A spacer 9 made of a hard resin material of Nm-2 or more is attached to the alignment film 3.
They were distributed and arranged upwards.

0003

However, in the prior art described above, the elastic modulus of the substrate film is 0.07 to 0.3 Nm-2.
Because it uses a soft resin material such as polyester or polycarbonate, when used as a display element that is subject to external stress such as a roller or bending, such as a display element for an IC card, the spacer may be damaged by the stress on the flexible substrate. If the spacer gets stuck or the spacer collapses, the gap between the substrates changes in that area, resulting in poor appearance due to color unevenness.

[0004]The present invention is intended to solve these problems, and its purpose is to provide a highly reliable liquid crystal display element that does not cause appearance defects or display defects even when external stress such as bending or local pressure is applied. It is in a place where we provide.

[0005]

[Means for Solving the Problems] In the liquid crystal display element of the present invention, a pair of flexible substrates on which an alignment film for aligning liquid crystal molecules is formed are opposed to each other by a sealing material at a constant interval via a spacer. In a liquid crystal display element formed by bonding and sealing the space, the spacer has an elastic modulus (Young's modulus).
It is characterized by using a resin having a resistance of 0.05 Nm-2 or less.

[0006]

[Example 1] FIG. 1 shows a sectional view of a liquid crystal display element of this example. Here, reference numeral 1 denotes an upper substrate and a lower substrate, both of which were made of PES (polyether sulfone) film with a thickness of 100 μm. 2 is a transparent electrode made of an ITO (indium tin oxide) film, 3 is an alignment film, 4 is a spacer (hereinafter referred to as an elastic resin ball) made of a resin with an elastic modulus (Young's modulus) of 0.05 Nm-2 or less, and 5 is a transparent electrode made of an ITO (indium tin oxide) film. sealing material,
6 is a liquid crystal. At this time, the elastic modulus of PES is 0.07
Since it is in the range of ~0.3Nm-2, the elastic resin ball is
The elastic modulus must be less than that. Therefore, 0
．． A resin having an elastic modulus of 0.05 Nm-2 or less was used.

[0007] In the manufacturing method of this liquid crystal display element, a transparent electrode 2 is formed on a PES film by a low-temperature sputtering method, and a predetermined pattern is formed by a photolithography method. The alignment film 3 is formed thereon by applying offset printing and firing. Next, the alignment film 3 is rubbed in a predetermined direction with a cloth to perform an alignment treatment, and then an epoxy adhesive containing a predetermined gap material as a sealing material is screen printed on one of the substrates, and an elastic resin is applied onto the substrate. The balls were spread by a wet spray method and the two substrates were bonded facing each other. The scattering density of the elastic resin balls was 150 balls/mm2. Next, liquid crystal 6 was filled by vacuum injection, and the injection part was sealed with an epoxy adhesive. A liquid crystal display element was completed by attaching polarizing plates to the top and bottom of this liquid crystal cell.

Even when the liquid crystal display element thus produced was bent or pressure was repeatedly applied locally, color unevenness occurred temporarily, but it quickly disappeared, and no appearance defects occurred.

[Example 2] In the manufacturing process of the liquid crystal display element of Example 1, immediately after the alignment film was offset printed, and before the solvent in the printed alignment film evaporated, the elastic resin balls were fixed and fired. The same effect as in Example 1 was also obtained when an alignment film was formed to form a liquid crystal display element as shown in FIG.

0010

Effects of the Invention As described above, according to the present invention, by using elastic resin balls as spacers that maintain the gap between substrates, reliability is achieved that does not cause appearance defects even when bending or local pressure is applied. This has the effect that it is possible to provide a liquid crystal display element with high quality.

[Brief explanation of drawings]

FIG. 1 is a diagram showing Embodiment 1 of the present invention.

FIG. 2 is a diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram showing a conventional liquid crystal display element.

[Explanation of symbols]

1. Upper board 2. Transparent electrode 3. Alignment film 4.　Elastic resin ball 5. Seal material 6.　LCD 7. Polarizer 8. a reflector 9. spacer

Claims (1)

[Claims] [Claim 1] A pair of flexible substrates on which alignment films for aligning liquid crystal molecules are formed are bonded facing each other with a sealing material at a constant interval via a spacer, and the liquid crystal is sealed in the interval. A liquid crystal display element, characterized in that the spacer is made of a resin having an elastic modulus (Young's modulus) of 0.05 Nm-2 or less.