US4297004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display cell
Assignee: Citizen Holdings Co Ltd
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Filing: 1979-09-17
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Granted: 1981-10-27
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Expires: 1999-09-17
Abstract
Abstract In the lead electrodes which connect to the display electrodes of a liquid crystal display device having lead electrodes which are of extremely narrow width and are spaced very closely together, the resistance of each lead electrode is reduced by means of a multi-layer structure of relatively low resistance, and leakage current is prevented from flowing between adjacent lead electrodes by providing a transparent insulating layer over and between the lead electrodes, thereby eliminating the deleterious effects upon display appearance of a high lead electrode resistance and leakage currents between lead electrodes.
Inventors
- 👤 Katsuo Nishimura
- 👤 Takanori Nanya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:00
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1345; G02F1/133345
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
167 words
In a liquid crystal display cell composed of two transparent supporting substrates arranged parallel to one another, sealed together peripherally to form an enclosed chamber containing a liquid crystal material, and having a transparent display electrode formed on an inner face of at least one of said transparent supporting substrates composed of a thin film of an electrically conductive substance and a lead electrode provided on said inner substrate face for providing electrical connection between said transparent display electrode and external drive means, the improvement comprising a multi-layer construction for said lead electrode for thereby reducing the electrical resistance thereof, said multi-layer lead electrode construction comprising a metallic electrode layer of a metallic substance formed on said inner substrate face and a lead electrode layer formed over said metallic electrode layer, said lead electrode layer being formed integrally with said display electrode and having a width which is substantially equal to the width of said metallic electrode layer, measured in a direction parallel to the substrate plane.
Claim 2
Dependent Claim
167 words
In a liquid crystal display cell composed of two transparent supporting substrates arranged parallel to one another, sealed together peripherally to form an enclosed chamber containing a liquid crystal material, and having a transparent display electrode formed on an inner face of at least one of said transparent supporting substrates composed of a thin film of an electrically conductive substance and a lead electrode provided on said inner substrate face for providing electrical connection between said transparent display electrode and external drive means, the improvement comprising a multi-layer construction for said lead electrode for thereby reducing the electrical resistance thereof, said multi-layer lead electrode construction comprising a metallic electrode layer of a metallic substance formed on said inner substrate face and a lead electrode layer formed over said metallic electrode layer, said lead electrode layer being formed integrally with said display electrode and having a width which is substantially equal to the width of said metallic electrode layer, measured in a direction parallel to the substrate plane.
Claim 3
Dependent Claim
39 words
The improvement according to claim 1, in which said metallic electrode layer is composed of a first layer of chromium deposited directly on said inner substrate face and a second layer of gold formed over said layer of chromium.
Claim 4
Dependent Claim
23 words
The improvement according to claim 2, in which said layer of chromium is formed substantially over the entirety of said inner substrate face.
Claim 5
Dependent Claim
19 words
The improvement according to claim 1, in which said lead electrode has a width of less than 30 microns.
Claim 6
Dependent Claim
44 words
The improvement according to claim 1, in which a plurality of said lead electrodes are provided on said inner substrate face and situated closely adjacent to one another, and further comprising a transparent insulating layer formed over and between said plurality of lead electrodes.
Claim 7
Dependent Claim
36 words
The improvement according to claim 5, in which said transparent insulating layer is formed from a substance selected from a group including Al 2 O 3 , SiO 2 , and Si 3 N 4 .
Claim 8
Dependent Claim
25 words
The improvement according to claim 5, and further comprising a transparent coating layer formed between said transparent insulating layer and said plurality of lead electrodes.
Claim 9
Dependent Claim
18 words
The improvement according the claim 7, in which said transparent coating layer is composed of SiO 2 .
Claim 10
Dependent Claim
25 words
The improvement according to claim 6, in which said transparent insulating layer has a thickness which is in the range of 0.1 to 3 microns.
Claim 11
Dependent Claim
25 words
The improvement according to claim 8, in which said transparent coating layer has a thickness which is in the range of 200 to 800 Angstroms.
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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |