Conductive composition for forming a ground electrode of a liquid crystal display, and a method of forming a ground electrode using the same

Patent metadata

Field	Value
Publication number	US-9460826-B2
Application number	US-201214361512-A
Country	US
Kind code	B2
Filing date	Dec 3, 2012
Priority date	Dec 29, 2011
Publication date	Oct 4, 2016
Grant date	Oct 4, 2016

Abstract

The present invention relates to a conductive composition for forming a back electrode of a liquid crystal device, and a formation method of a back electrode using the same. The conductive composition enables the supply of a back electrode having excellent coating uniformity, low surface resistance, high transmittance and surface hardness, and particularly excellent reliability of 500 hours.

First claim

The invention claimed is:

1. A conductive composition for forming a ground electrode of a liquid crystal display (LCD), comprising:
a conductive polymer at 0.1 to 10 weight %;
a dopant at 0.1 to 10 weight %;
a solvent at 60 to 95 weight %, said solvent having a carbonyl group in the molecule; and
a silane coupling agent at 0.1 to 20 weight %.

2. The conductive composition according to claim 1 , wherein the solvent is one or more solvents selected from the group consisting of dimethylformamide, acetylacetone, and a mixture thereof.

3. The conductive composition according to claim 1 , wherein the solvent is a mixture of dimethylformamide and acetylacetone.

4. The conductive composition according to claim 1 , further comprising one or more co-solvents selected from the group consisting of methyl alcohol, ethyl alcohol, isopropanol, ethylene glycol, butanediol, neopentyl glycol, 1,3-pentanediol, 1,4-cyclohexane dimethanol, diethylene glycol, polyethylene glycol, polybutylene glycol, dimethylol propane, trimethylol propane, propylene glycol monomethyl ether, chloroform, dichloromethane, tetrachloroethylene, trichloroethylene, dibromoethane, dibromopropane, n-methyl pyrrolidone, dimethyl sulfoxide, triethylamine, tributylamine, trioctylamine, cresol, and water.

5. The conductive composition according to claim 4 , wherein the co-solvent is included with a weight ratio of 1:10 to 1:20 on the basis of the weight of the solvent having a carbonyl group in the molecule.

6. The conductive composition according to claim 1 , wherein said solvent is selected from the group consisting of: 5 to 30 parts by weight of dimethylformamide, acetylacetone, and a mixture thereof; and said composition further comprising a co-solvent selected from the group consisting of: 100 parts by weight of isopropyl alcohol; 80 to 150 parts by weight of propylene glycol monomethyl ether; and 50 to 120 parts by weight of water; wherein said solvent and co-solvent are mixed.

7. The conductive composition according to claim 1 , wherein the conductive polymer is one or more polymers selected from the group consisting of polyaniline-based polymer, polypyrrole-based polymer, and polythiophene-based polymer.

8. The conductive composition according to claim 1 , wherein the conductive polymer is poly(3,4-ethylene dioxythiophene).

9. The conductive composition according to claim 1 , wherein the dopant is one or more compounds selected from the group consisting of dodecylbenzenesulfonic acid, toluenesulfonic acid, camphorsulfonic acid, benzenesulfonic acid, hydrochloric acid, styrenesulfonic acid, 2-acrylamido-2-methylpropanesulfonic acid, 2-sulfosuccinate, 5-sodiumsulfoisophthalic acid, dimethyl-5-sodiumsulfoisophthalate, and 5-sodiumsulfo-bis(β-hydroxyethylisophthalate).

10. The conductive composition according to claim 1 , wherein the, dopant is poly(4-styrenesulfonate).

11. The conductive composition according to claim 1 , wherein the silane coupling agent is one or more compounds selected from the group consisting of an alkyloxysilane-based compound, an aminosilane-based compound, a vinylsilane-based compound, an epoxysilane-based compound, a methacryloxysilane-based compound, an isocyanatesilane-based compound, and a fluorinesilane-based compound.

12. The conductive composition according to claim 1 , further comprising one or more additives selected from the group consisting of a binder resin, a surfactant, and a diluent solution of hydrochloric acid or acetic acid.

13. The conductive composition according to claim 12 , wherein the content of the additive is 0.1 to 5 weight % per the total weight of the composition.

14. A method of forming a ground electrode for liquid crystal display, including a step of coating the conductive composition according to claim 1 on a substrate.

Assignees

• Dongjin Semichem Co Ltd

Inventors

• Byeon Ja Hun
• Kim Dong Min
• Lee Won-Young
• Jeagal Eun
• Kim Seung-Ki
• Hong Woo Sung
• Lee Jung Yul
• Kim You-Young

Classifications

• G02F1/13439

  characterised by their electrical, optical, physical properties; materials therefor; method of making · CPC title

• C08K5/5415

  containing at least one Si—O bond · CPC title

• H01B1/127 Primary

  comprising five-membered aromatic rings in the main chain, e.g. polypyrroles, polythiophenes · CPC title

• B05D5/12

  to obtain a coating with specific electrical properties · CPC title

• H01B1/22

  the conductive material comprising metals or alloys · CPC title