JPH04235527A - Substrate for liquid crystal cell - Google Patents

Abstract

PURPOSE:To obtain a substrate for a liquid crystal cell which possesses a lightweight and thin plate property, impact resistance, rigidity, and superior surface evenness, and with which a large-sized liquid crystal display device can be formed. CONSTITUTION:A substrate for liquid crystal cell has a thin plate 2 made of glass at least on one side of a transparent resin substrate 1 and a transparent electric conductive layer 3 on the thin plate 2 if necessary. Accordingly, a liquid crystal cell which shields the transmission of oxygen and prevents the deterioration of a liquid crystal and possesses a long service life can be formed. The conventional technique can be utilized in its orientation processing, sealing processing, etc.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal cell substrate suitable for forming a large liquid crystal cell.

0002

2. Description of the Related Art Focusing on the advantage of lightweight liquid crystal cells, the development of even larger display devices is being considered. However, there are drawbacks to the cell substrate, which is an obstacle to increasing the screen size. Conventionally, glass plates,
Resin plates were known. However, glass plates have a problem in that they have poor impact resistance and are easily broken, making it difficult to achieve a thickness of 500 μm or less, making it impossible to achieve thinness and weight reduction. On the other hand, resin plates have a problem of rough surfaces and poor rigidity. Surface roughness causes non-uniformity of the alignment film, leading to uneven display, and insufficient rigidity causes deflection and insufficient strength, making it difficult to achieve a large screen in either case.

0003

SUMMARY OF THE INVENTION An object of the present invention is to develop a substrate for a liquid crystal cell that enables a larger screen.

0004

[Means for Solving the Problems] The present invention provides a substrate for a liquid crystal cell, characterized in that a thin plate made of glass is provided on at least one side of a transparent resin substrate, or a transparent conductive layer is provided on the thin glass plate. The present invention provides a substrate for a liquid crystal cell characterized by having the following features.

[0005]

[Function] With the above structure, in addition to achieving a smooth surface based on the glass plate and imparting impact resistance based on the resin substrate, it is possible to achieve excellent rigidity.

[0006]

EXAMPLE FIG. 1 shows an example of a substrate for a liquid crystal cell according to the present invention. 1 is a transparent resin substrate, 2 is a thin glass plate, and 3 is a transparent conductive layer.

[0007] As the resin substrate, one made of thermoplastic resin or thermosetting resin is used. There are no particular limitations on the type of resin, and those with excellent transparency such as epoxy resins are preferred. Moreover, those having a glass transition point of 150° C. or higher are preferable. The thickness of the transparent substrate may be determined as appropriate depending on the dimensions of the substrate. Generally, from the viewpoint of thinning, the thickness is set to 100 μm to 10 mm.

[0008] A silane coupling agent is preferably added to the resin substrate from the viewpoint of adhesion to the thin glass plate to be adhered thereto. Adhesion to the thin glass plate can also be improved by treating the surface of the resin substrate with a silane coupling agent.

[0009] As a thin glass plate, from the point of view of thinning,
Thicknesses of 500 μm or less, particularly 10 to 300 μm, are preferably used. The bending modulus of the liquid crystal cell substrate is 2.
It is preferable to use a combination in which the weight ratio is 104 kg/cm2 or more. Glass thin plates may be provided on both sides of the resin substrate, if necessary.

[0010] The resin substrate and the thin glass plate may be bonded by any appropriate method, such as using an adhesive or applying liquid resin onto the thin glass plate and solidifying it to form the substrate.

[0011] The transparent conductive layer provided on the thin glass plate as required may be formed by any suitable method such as by applying a transparent conductive paint. A preferred formation method is to deposit a transparent conductive layer forming material such as tin oxide, indium oxide, gold, platinum, or palladium by sputtering or the like.

[0012] The liquid crystal cell can be formed, for example, by a method in which liquid crystal is sealed between liquid crystal cell substrates arranged with their transparent conductive layers facing each other. At that time, an alignment film for aligning the liquid crystal is provided on the transparent conductive layer as necessary.

By the way, the silane coupling agent is 1.5
Thickness 20% by weight of thermosetting epoxy resin mixed
A thin plate of silicate glass with a thickness of 50 μm is adhered to one side of a 0 μm transparent resin substrate using an epoxy resin of the same composition as an adhesive, and indium oxide and tin oxide are applied onto the thin glass plate by sputtering. A transparent conductive layer made of a composite oxide (10% by weight of tin oxide) was formed to obtain a substrate for a liquid crystal cell having a thickness of 300 μm.

The above substrate for a liquid crystal cell had a specific gravity of 1.4 and a surface roughness (on the thin glass plate side) of Ra: 10 nm. Further, the bending elastic modulus was 40,000 kg/cm2, and the oxygen permeability was 0 cc/m2; atm.day.

[0015] In the case of the conventional example (Japanese Unexamined Patent Publication No. 63-1
92014), the specific gravity is 2.4 in a glass substrate with a thickness of 1100 μm. Further, a resin substrate with a thickness of 100 μm has a surface roughness Ra of 200 nm. Also,
The bending elastic modulus is also 20,000 kg/cm2, and the oxygen permeability is 0.5 cc/m2; atm·day.

The liquid crystal cell substrate of the present invention can be applied to various liquid crystal display devices such as office automation equipment such as word processors and personal computers, and liquid crystal panels.

[0017]

According to the present invention, it is possible to prevent the permeation of oxygen that degrades liquid crystals, and it is possible to form a liquid crystal cell with an excellent lifespan. Moreover, it has excellent lightness, thinness, impact resistance, rigidity, and surface smoothness, and can be used to form a large liquid crystal display device. Furthermore, conventional techniques can be used for alignment processing and sealing processing, and the processing can be performed easily.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment.

[Explanation of symbols]

1: Transparent resin substrate 2: Glass thin plate 3: Transparent conductive layer

Claims (2)

[Claims] 1. A substrate for a liquid crystal cell, characterized in that a thin plate made of glass is provided on at least one side of a transparent resin substrate. 2. A liquid crystal cell substrate according to claim 1, further comprising a transparent conductive layer on the thin glass plate.