US5105291A
Expired / Lapsed
US
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Liquid crystal display cell with electrodes of substantially amorphous metal oxide having low resistivity
Assignee: Ricoh Co Ltd
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Filing: 1990-10-31
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Granted: 1992-04-14
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Expires: 2010-10-31
Abstract
Abstract A liquid crystal display cell comprising a pair of flexible polymer film substrates having a transparent electrode disposed on the surface thereof and a liquid crystal material sandwiched therebetween. The transparent electrode is a metal oxide film which has a surface resistivity of not greater than 100 ohm per square, a bending property of not greater than 2.0, a curling degree, H, of 0<H<5 mm and a transmittance to light of 550 nm of not less than 75%. Further, this metal oxide is substantially amorphous, and is formed by a DC sputtering method.
Inventors
- 👤 Fuyuhiko Matsumoto
- 👤 Masato Tani
- 👤 Takamichi Enomoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:38
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1343; G02F1/13439
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
A liquid crystal display cell comprising a pair of flexible polymer film substrates having a transparent electrode disposed on the surface thereof and a liquid crystal layer sandwiched therebetween, said transparent electrode being a metal oxide film which has an amorphous portion of not less than 50% in the entire metal oxide film, a surface resistivity of 10 to 80 ohm per square, a transmittance to light of 550 nm of not less than 75%, and a bending property of not greater than 2.0.
Claim 2
Dependent Claim
84 words
A liquid crystal display cell comprising a pair of flexible polymer film substrates having a transparent electrode disposed on the surface thereof and a liquid crystal layer sandwiched therebetween, said transparent electrode being a metal oxide film which has an amorphous portion of not less than 50% in the entire metal oxide film, a surface resistivity of 10 to 80 ohm per square, a transmittance to light of 550 nm of not less than 75%, and a bending property of not greater than 2.0.
Claim 3
Dependent Claim
31 words
A liquid crystal display cell according to claim 1, wherein the transparent electrode has a curling degree, H, of 0<H<5 mm and an etching time of not greater than 90 sec.
Claim 4
Dependent Claim
20 words
A liquid crystal display cell according to claim 1, wherein the transparent electrode is formed by a DC sputtering method.
Claim 5
Dependent Claim
68 words
A liquid crystal display cell according to claim 3, wherein the DC sputtering method is carried out under film-forming conditions of a mixing ratio (partial pressure ratio) between a reaction gas and a carrier gas of 5/1000-10/1000, a vacuum degree of 10 -3 -10 -4 Torr, a film-forming rate of 5-13 Å/sec, a sputtering voltage of 200-500 V and a substrate temperature of not higher than 120° C.
Claim 6
Dependent Claim
22 words
A liquid crystal display cell according to claim 1, wherein the thickness of the transparent electrode is from 500 to 2000 Å.
Claim 7
Dependent Claim
31 words
A liquid crystal display cell according to claim 1, wherein said metal oxide film is selected from the group consisting of ITO, indium oxide, tin oxide, zinc oxide or antimony oxide.
Claim 8
Dependent Claim
100 words
A liquid crystal display cell comprising a pair of flexible polymer film substrates having a transparent electrode disposed on the surface thereof and a liquid crystal layer sandwiched therebetween, said transparent electrode being a metal oxide film which has an amorphous portion of not less than 70% in the entire metal oxide film, a surface resistivity of 10 to 80 ohm per square, a transmittance to light of 550 nm of not less than 80%, a bending property of not greater than 1.5, a curling degree, H, of 0<H<5 mm and an etching time of not greater than 90 sec.
Claim 9
Dependent Claim
100 words
A liquid crystal display cell comprising a pair of flexible polymer film substrates having a transparent electrode disposed on the surface thereof and a liquid crystal layer sandwiched therebetween, said transparent electrode being a metal oxide film which has an amorphous portion of not less than 70% in the entire metal oxide film, a surface resistivity of 10 to 80 ohm per square, a transmittance to light of 550 nm of not less than 80%, a bending property of not greater than 1.5, a curling degree, H, of 0<H<5 mm and an etching time of not greater than 90 sec.
Claim 10
Dependent Claim
20 words
A liquid crystal display cell according to claim 7, wherein the transparent electrode is formed by a DC sputtering method.
Claim 11
Dependent Claim
68 words
A liquid crystal display cell according to claim 8, wherein the DC sputtering method is carried out under film-forming conditions of a mixing ratio (partial pressure ratio) between a reaction gas and a carrier gas of 5/1000-10/1000, a vacuum degree of 10 -3 -10 -4 Torr, a film-forming rate of 5-13 Å/sec, a sputtering voltage of 200-500 V and a substrate temperature of not higher than 120° C.
Claim 12
Dependent Claim
22 words
A liquid crystal display cell according to claim 7, wherein the thickness of the transparent electrode is from 500 to 2000 Å.
Claim 13
Dependent Claim
31 words
A liquid crystal display cell according to claim 7, wherein said metal oxide film is selected from the group consisting of ITO, indium oxide, tin oxide, zinc oxide or antimony oxide.
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) | 1995-04-14 | 1995-10-14 | 1996-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-14 | 1999-10-14 | 2000-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-14 | 2003-10-14 | 2004-04-14 | $7700.00 | Window Closed / Lapsed |