Process for producing liquid crystal display element

• US 4,238,276 A
• Filed: 03/16/1979
• Issued: 12/09/1980
• Est. Priority Date: 05/19/1978
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Ishibashi, Tadashi, Kinugawa, Kiyoshige, Ishitani, Shizuo, Ogihara, Satoru, Hanada, Yosio
• Primary Examiner(s): Powell, William A.
• Application Number:
  US06/021,185
• Time in Patent Office: 634 Days
• Field of Search: 156/99, 156/107, 156/145, 156/629, 156/633, 156/634, 156/654, 156/655, 156/656, 156/667, 156/659, 428/1, 427/108, 427/110, 427/93, 427/58, 427/126, 427/95, 427/264, 427/269, 427/270, 427/272, 427/287, 427/309, 427/383, 350/160 LC, 350/330-333, 430/20, 430/313, 430/315, 430/316, 430/318, 430/319
• US Class Current: 216/23
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: H01L 31/1884 Manufacture of transparent electrodes, e.g. TCO, ITO
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy
• CPC Class Codes: Y10T 29/49126 Assembling bases

Abstract

A liquid crystal display element is produced by forming an electrical insulating metal oxide film on a transparent glass substrate, forming a transparent conductive film thereon by coating a coating solution prepared by diluting a solute comprising indium, tin, a β-diketone and nitric acid with an organic solvent, followed by calcination, etching the transparent conductive film to give electrodes having desired patterns, placing the two resulting glass substrates in parallel so that individual electrodes at the inner side stand opposite to each other, and enclosing a liquid crystal material in the space formed between the two glass substrates. The liquid crystal display element thus produced has transparent electrodes which have low sheet resistance, enhanced mechanical strength and strong adhesive strength to the glass substrate.

Claims

1. A process for producing a liquid crystal display element which comprises

forming an electrical insulating metal oxide film on a transparent glass substrate,

forming a transparent conductive film thereon by coating a coating solution prepared by diluting a solute comprising indium, tin, a β

-diketone and nitric acid with an organic solvent, followed by calcination,

etching the transparent conductive film to give a first composite having electrodes having desired patterns,

performing said forming an electrical insulating metal oxide film step, said forming a transparent conductive film step, and said etching step on a second transparent glass substrate to give a second composite having electrodes having desired patterns,

placing the two resulting composites spaced from each other and in parallel so that the electrodes of each composite are positioned at the inner side of the display element and stand opposite to each other, and

enclosing a liquid crystal material in the space formed between the two composites.

2. A process according to claim 1, wherein the metal oxide film is a silicon oxide film.

3. A process according to claim 1, wherein the metal oxide film is formed by coating an organic solvent containing silicon hydroxide on the glass substrate and calcining.

4. A process according to claim 1, wherein the solute comprises 1 part by weight of indium, 0.01 to 0.30 part by weight of tin, 1.3 to 9.0 parts by weight of acetylacetone and 1.0 to 6.0 parts by weight of nitric acid.

5. A process according to claim 1, wherein the organic solvent used for diluting the solute is methanol, ethanol, or acetone, or a mixture of two or more of them.

6. A process according to claim 1, wherein the transparent conductive film is formed by coating the coating solution on the glass substrate covered with the metal oxide film and subjecting it to a provisional drying step in which the coated substrate is dried at a temperature of 35°

to 100°

C., to a temperature rise step in which the coated substrate is heated at a temperature rise rate of 20°

C./min or more up to 400°

C. or higher, and to a calcination step in which the coated substrate is calcined at a temperature of 400°

C. or higher.

7. A process according to claim 1, wherein the transparent glass substrate is made of soda-lime glass.

8. A process according to claim 1, wherein the metal oxide film is made of material selected from the group consisting of silicon oxide, titanium oxide, aluminium oxide, zirconium oxide, magnesium oxide, nickel oxide, and mixtures thereof.

9. A process according to claim 1, wherein the weight ratio of said solute to said organic solvent is 1/1 to 1/20.

10. A process according to claim 1, wherein the two resulting composites are spaced from each other a distance of between 5-15 μ

m.

11. A process according to claim 6, wherein said provisional drying step is at a temperature of 45°

to 70°

C.

12. A process according to claim 6, wherein said temperature rise step is at least 100°

C./min.

13. A process according to claim 6, wherein the calcination step is at a temperature of at most 530°

C.