US4238276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing liquid crystal display element
Assignee: Hitachi Ltd
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Filing: 1979-03-16
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Granted: 1980-12-09
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Expires: 1999-03-16
Abstract
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.
Inventors
- 👤 Kiyoshige Kinugawa
- 👤 Satoru Ogihara
- 👤 Yosio Hanada
- 👤 Shizuo Ishitani
- 👤 Tadashi Ishibashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:25
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1343; G02F1/13439; H; H10; H10F; H10F71/00; H10F71/138; Y; Y02; Y02E; Y02E10/00; Y02E10/50; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49126
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
155 words
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.
Claim 2
Dependent Claim
155 words
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.
Claim 3
Dependent Claim
16 words
A process according to claim 1, wherein the metal oxide film is a silicon oxide film.
Claim 4
Dependent Claim
27 words
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.
Claim 5
Dependent Claim
42 words
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.
Claim 6
Dependent Claim
29 words
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.
Claim 7
Dependent Claim
99 words
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.
Claim 8
Dependent Claim
16 words
A process according to claim 1, wherein the transparent glass substrate is made of soda-lime glass.
Claim 9
Dependent Claim
36 words
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.
Claim 10
Dependent Claim
21 words
A process according to claim 1, wherein the weight ratio of said solute to said organic solvent is 1/1 to 1/20.
Claim 11
Dependent Claim
22 words
A process according to claim 1, wherein the two resulting composites are spaced from each other a distance of between 5-15 μm.
Claim 12
Dependent Claim
20 words
A process according to claim 6, wherein said provisional drying step is at a temperature of 45° to 70° C.
Claim 13
Dependent Claim
16 words
A process according to claim 6, wherein said temperature rise step is at least 100° C./min.
Claim 14
Dependent Claim
19 words
A process according to claim 6, wherein the calcination step is at a temperature of at most 530° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-09 | 1984-06-09 | 1984-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-09 | 1988-06-09 | 1988-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-09 | 1992-06-09 | 1992-12-09 | $7700.00 | Window Closed / Lapsed |