JPS6258224A - Transparent conductive base material - Google Patents

Abstract

PURPOSE:To permit stable production of a display plate having uniform and high quality by providing a conductive layer to a synthetic resin substrate having a polarizing function. CONSTITUTION:The conductive layer 2 is provided on at least one face of the substrate 1. The layer 2 is formed of a metal or metallic oxide by a sputtering or vacuum deposition method. The metallic component is preferably composed essentially of the oxide of indium or tin in particular. The substrate 1 is constituted of the transparent synthetic resin and is essentially required to have a polarizing function. The method for providing the polarizing function to the substrate 1 is exemplified by a method for compounding a polarizing dye component such as dichromatic dye or iodine in the stage of producing the substrate 1 or a method for sticking the dichromatic dye onto the substrate surface after production by a sputtering or vapor deposition method.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a transparent conductive base material, and more particularly to a transparent conductive base material suitable as a display plate for a liquid crystal display.

(Prior Art and Its Disadvantages) Transparent conductive substrates are usually used as touch panels and transparent switches, and are also used, for example, as display plates for liquid crystal displays. This display board usually has a conductive layer on one side of a glass substrate and a polarizing film layer on the other side, but the conductive layer is formed by sputtering or vacuum deposition of a metal or metal oxide. Further, the polarizing film layer is formed by laminating polarizing films made of synthetic resin such as polyvinyl alcohol containing a-V or polyester containing or adsorbing a dichroic dye.

However, since the substrate of a display panel having such a structure is made of glass, it is weak in bending strength and impact strength, and it is difficult to manufacture a display panel with a curved surface. Recently, a method has been proposed to replace the glass substrate with a synthetic resin substrate such as polyester.In this case, the display board itself is flexible, so the above drawbacks are improved.
Furthermore, it is preferable because the weight of the display board can be reduced.

However, in this case, the polarizing film is laminated on the synthetic resin substrate, but it is extremely difficult to evenly and uniformly laminate the polarizing film, and a great deal of care is required. In addition, in normal display boards, a cellulose-based or organic silicon-based retention layer is placed on the outside of the polarizing film layer.
In addition, an alignment film such as polyimide resin is provided on the outside of the conductive layer, but these layers are formed by applying a liquid material, so the film itself is laminated with a polarizing film. Only.

(Objectives and Solutions of the Invention) In view of the above-mentioned circumstances, the present invention provides a method that can stably produce uniform, high-quality display boards without the need for lamination processing of polarizing films. This objective can be achieved by using a transparent conductive base material having a conductive layer formed by sputtering or vacuum deposition of a metal or metal oxide on at least one side of a synthetic resin substrate having a polarizing function. Ru.

(Structure of the Invention) Hereinafter, the present invention will be explained in detail with reference to the drawings. FIG. 1 is a sectional view showing an example of an uninvented transparent conductive base material, and FIG. 11 is a cross-sectional view of the plate, 11) is a substrate, (2) is a conductive layer, (3) is an alignment layer,
(4) indicates a protective layer, and (5) indicates a polarizing film.

In the present invention, the substrate (1) is made of a transparent synthetic resin and must have a polarizing function. Examples of the synthetic resin include polyethylene terephthalate, polyethylene, 6-naphthalene dicarboxylate, etc. , polycarbonate, polystyrene, cellulose triacetate, cellulose diacetate, polyvinyl chloride, polypropylene, polyamide, etc., and polyethylene terephthalate is usually preferred. If the substrate (1) is thicker than necessary, not only will the weight of the product increase, but also the viewing angle will be narrowed when used as a display board, but it is desirable that the substrate (1) be too thin. As a method for imparting a polarizing function to a substrate (1) made of synthetic resin, for example, the substrate (1)
Examples include a method in which a polarizing dye component such as a dichroic dye or iodine is blended during production, or a method in which a dichroic dye is attached to the surface of the substrate after production by sputtering or vacuum evaporation. Further, the dye used here is not particularly limited as long as it is used in manufacturing ordinary polarizing films, but for example, the following dyes are suitable.

-Number - ■Anthraquinone ■Azo system ■Stilbene system ■Methine system ■Cyanine system L; fig
In the present invention, the above-mentioned substrate (1)
A conductive layer (2) is provided on at least one side of the conductive layer (2), and this conductive layer (2) is formed of metal or metal oxide by sputtering or vacuum evaporation. The metal component usually includes those mainly composed of metals such as indium, tin, palladium, platinum, and gold, or oxides such as indium, tin, and zinc, and in particular, those mainly composed of indium or tin oxides. Preferably.

The sputtering method involves filling a vacuum tank with an inert gas such as nitrogen, argon, etc., ionizing the inert gas and irradiating it onto the target, scattering the target in an atomic or molecular state, and removing the evaporated target material. This is a method of depositing on the substrate surface, and methods include glow discharge sputtering, magnetron sputtering, and ion beam sputtering.

The vacuum evaporation method is a method in which the evaporation material is heated and evaporated in a high vacuum, and the evaporated particles are deposited on the substrate. Depending on the heating method, resistance heating method, arc evaporation method, laser heating method, high frequency heating method , electron beam heating method, etc.

Sputtering or vacuum deposition of these metal components is carried out according to conventional methods, for example, using a DC magnetron sputtering device or an ion beam evaporation device, as necessary.
In an inert gas containing a small amount of oxygen, go-i
soc, preferably 0 ~ tOocI') at temperature / 0
-'-10-"torr, preferably 10'"" to
It can be carried out under reduced pressure on the order of rr. Conductive layer (2
) is usually formed when the resistance value of the substrate is 10'-10''Ω, and the visible light transmittance (jjOmm) is 30cm or more.
Preferably, it is adjusted to be more than 4IO. Note that it is preferable to form the conductive layer (2) by a sputtering method because a higher quality conductive base material can be obtained.

Although the conductive layer (2) may be provided on both sides of the substrate +11, it is usually provided on only one side when used for a display board for a liquid crystal display. Note that when dichroic dye is applied to the substrate (1) by sputtering or vacuum evaporation, it is usually desirable to provide the conductive layer (2) on the opposite surface.

In the present invention, since the conductive layer (2) is provided directly on the synthetic resin substrate (1) having a polarizing function, the base material can be made lighter and more flexible, and the manufacturing process can also be simplified. can do. In contrast, in the case of a conventional product as shown in Figure 1, a polarizing film (5) is laminated on one side of a glass substrate (1), while a conductive layer (2) is provided on the other side. Therefore, the expected effects of the present invention cannot be obtained.

The transparent conductive substrate of the present invention can be applied to various uses, and is processed as appropriate depending on the use. Normally, when used as a display board for a liquid crystal display, an alignment layer (2) made of, for example, a polyimide resin, an organic silane compound, or polyvinyl alcohol is provided on the outside of the conductive layer (2), and an A protective layer (4) made of, for example, organic silicon or cellulose is provided on the substrate (1). The components, thickness, forming means, etc. of the alignment layer (2) and film-retaining layer (4) are not particularly limited, and can be appropriately selected from known methods.

(Effects of the Invention) According to the present invention, since the substrate is made of synthetic resin, it is lightweight;
Furthermore, since it is flexible, it not only has excellent bending strength and impact strength, but also allows easy production of display boards with curved surfaces. Further, unlike conventional products, there is no need to laminate polarizing films, so there is no need for any laminate operation in the manufacturing process, which is desirable from a manufacturing standpoint.

(Examples) Next, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to the following Examples unless the gist thereof is exceeded.

Example 1 A molded product having a thickness of l? S
On one side of the substrate (1) made of I+111 polyethylene terephthalate, a conductive layer ( 2) was formed.

Sputtering conditions> Atmosphere gas: Argon containing acid $/vo1%, gas temperature
Degree: riOC Pressure Crab J
The transparency of m) was also good at 4 Iots. In addition, this base material was lightweight and flexible, and had a thin overall thickness and a large viewing angle as a display board.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of the transparent conductive base material of the present invention, and FIG. A conductive layer, (3) an alignment layer, (4) an elasticity layer, and (5) a polarizing film. Applicant: Mitsubishi Chemical Industries, Ltd. Agent Patent attorney Necessity - (1 other person)

Claims (3)

[Claims] (1) A transparent conductive base material comprising a conductive layer formed of a metal or metal oxide by sputtering or vacuum deposition on at least one side of a synthetic resin substrate having a polarizing function. (2) The transparent conductive substrate according to claim (1), wherein the synthetic resin substrate has a thickness of 50 to 250 μm. (3) The transparent conductive substrate according to claim (1), wherein the synthetic resin substrate is made of polyethylene terephthalate.