JPH02117015A - Manufacture of transparent electrode - Google Patents

Abstract

PURPOSE:To make it possible to mass-produce patterned transparent electrodes in a short time by coating the base with paste consisting of a resin in which conductive filler with a mean particle diameter less than 0.4mum is dispersed by printing, and drying the coating membrane. CONSTITUTION:A paste made by dispersing 100 wt.pt. or more of conductive filler with the mean diameter less than 0.4mum, to 100 wt.pt. of resin in a resin is spread on a base in the printing method, and dried to form a transparent electrode. That is, by making the particle diameter of the conductive filler less than the wavelength of the visible light, transparency is given to the membrane. And by making the weight ratio of conductive filler to resin unity or more, particles of conductive filler after drying are completely or almost brought into contact with each other, and a membrane with a very high conductivity is formed. Consequently, patterned transparent electrodes can be mass-produced in a short time.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to liquid crystal display devices, solar cells, transparent tablets,
The present invention relates to a method for producing transparent electrodes used in liquid crystal light control glass, anti-fog glass, etc.

<Conventional technology> Conventionally, methods for manufacturing transparent electrodes include spraying and coating methods that utilize hydrolysis of thin films such as tin oxide, and chemical vapor deposition (hereinafter abbreviated as FCVD method) that utilizes thermal decomposition reactions. ), or physical vapor deposition method (
Hereinafter, it will be abbreviated as rPVD method J. ) was formed.

<Problems to be Solved by the Invention> Spraying methods and coating methods generally require high processing temperatures, and the substrate temperature often ranges from 400'C to 600'C. For this reason, when a transparent electrode is provided on a glass substrate having a color filter using dyes and organic pigments as coloring materials, there is a drawback that the dyes and organic pigments discolor.

Many attempts have been made to use tin oxide in the CvO method, but it has the disadvantage that only liquids and solids that are easily vaporized can be used as raw materials, which limits the range of raw materials that can be selected.

PVD methods include vacuum evaporation method, ion blating method, sputter evaporation method, molecular beam crystal growth method, etc., but all of them require batch processing because they are film forming processes in a vacuum state. This was one of the causes of longer production times. Furthermore, since the film-forming process temperature is very high, the substrate temperature often rises to 2.0° C. or more, which has the disadvantage that it cannot be used for substrates with weak heat resistance. moreover,
When selectively forming transparent electrodes on a substrate, PVD
After forming a film on the entire surface using a method, processing such as pattern etching was required.

Means for solving the problem〉 Resin by weight ratio], average particle size is 0°4 μm per 00 parts
The following conductive fillers 1. A paste in which 0 parts or more is dispersed in the resin is applied to a substrate by a printing method and dried to form a transparent electrode.

<Action of the Invention> The present invention provides transparency to the film by making the particle size of the conductive filler smaller than the wavelength of visible light. In addition, by setting the content of the conductive filler to 100 parts or more of the conductive filler to 100 parts of the resin by weight,
Do the conductive fillers touch each other in the film after drying?
Alternatively, they may exist in close proximity, forming a coating with extremely high conductivity. At this time, conductivity when the conductive fillers are located close to each other without contacting each other is considered to be due to thermionic emission or tunnel effect.

<Example> In terms of weight ratio, acrylic resin (trade name Almatex D1
51 Solvent content 30% Manufactured by Mitsui Toatsu Chemical Co., Ltd.) 100
part, ITO fine powder (particle size 0.02~0.08μ
m) 200 parts were mixed to prepare a paste-like conductive ink.

Using this ink, a striped pattern was printed on a glass substrate by an offset printing method. Thereafter, it was dried for 30 minutes in an oven at 150°C. The striped pattern transparent electrode made in this way has a surface resistance value of 40.
00Ω/mouth, and the light transmittance was 85%.

<Effects of the Invention> According to the present invention, patterned transparent electrodes can be mass-produced in a short time with simple steps because all printing methods such as screen printing and flexographic printing can be used. Furthermore, since the processing temperature is low, transparent electrodes can be formed even on substrates with weak heat resistance. Furthermore, since there is a wide selection range of conductive fillers as raw materials, raw materials can be used depending on the purpose.

Patent applicant: Miura Printing Co., Ltd.

Claims (2)

[Claims] (1) A transparent electrode characterized by comprising the steps of applying a paste in which a conductive filler with an average particle size of 0.4 μm or less is dispersed in a resin to a substrate by a printing method, and drying the applied film. manufacturing method. (2) The method for manufacturing a transparent electrode according to claim 1, characterized in that the content of the conductive filler in the paste is at least 100 parts by weight per 100 parts of the resin. A method for manufacturing a transparent electrode.