US4997262A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display element
Assignee: Sharp Corp
•
Filing: 1990-04-30
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Granted: 1991-03-05
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Expires: 2010-04-30
Abstract
Abstract A liquid crystal display element for matrix display, employing, as address elements, thin film transistors each having a layered arrangement of a gate electrode, an insulating film, a semiconductor film, a source electrode, a drain electrode and a display picture element electrode formed in that order on an insulating substrate. The liquid crystal display element is characterized by a thin metallic film for smoothing path lines for the source electrodes, formed of the same material as that forming the gate electrodes in a plane including the gate electrodes.
Inventors
- 👤 Ikuo Sakono
- 👤 Motokazu Inui
- 👤 Hiroaki Kato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:13
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/1368; G02F1/136259; G02F1/136263
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
180 words
A liquid crystal display device comprising: an insulating substrate; an insulating film formed on the insulating substrate; a plurality of row and column electrodes formed on the insulating film, said column electrodes having a first predetermined width; a plurality of thin film transistors formed on the insulating film at the intersections of the row and column electrodes, each of said thin film transistors having a gate electrode connected to each of the row electrodes, a source electrode and a drain electrode, either of the source and drain electrodes being connected to the column electrode; a plurality of picture element electrodes formed on the insulating film, each of the picture element electrodes being connected to the other of the source and drain electrodes; and thin film layers formed along and under the column electrodes between the row electrodes and formed in the same plane as that of the row electrodes, each of said thin film layers having a second predetermined width greater than or equal to said predetermined width of the column electrodes to prevent the insulating substrate from being etched.
Claim 2
Dependent Claim
180 words
A liquid crystal display device comprising: an insulating substrate; an insulating film formed on the insulating substrate; a plurality of row and column electrodes formed on the insulating film, said column electrodes having a first predetermined width; a plurality of thin film transistors formed on the insulating film at the intersections of the row and column electrodes, each of said thin film transistors having a gate electrode connected to each of the row electrodes, a source electrode and a drain electrode, either of the source and drain electrodes being connected to the column electrode; a plurality of picture element electrodes formed on the insulating film, each of the picture element electrodes being connected to the other of the source and drain electrodes; and thin film layers formed along and under the column electrodes between the row electrodes and formed in the same plane as that of the row electrodes, each of said thin film layers having a second predetermined width greater than or equal to said predetermined width of the column electrodes to prevent the insulating substrate from being etched.
Claim 3
Dependent Claim
23 words
A liquid crystal display device as claimed in claim 1, wherein the row electrodes and the thin film layers comprise the same material.
Claim 4
Dependent Claim
21 words
A liquid crystal display device as claimed in claim 2, wherein the row electrodes and the thin film layers comprise tantalum.
Claim 5
Dependent Claim
20 words
A liquid crystal display device as claimed in claim 1, wherein the thin film transistors are of reverse stagger type.
Claim 6
Dependent Claim
19 words
A liquid crystal display device as claimed in claim 1, wherein the insulating film comprises a tantalum pentaoxide film.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-04 | 1994-09-03 | 1995-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-04 | 1998-09-03 | 1999-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-04 | 2002-09-03 | 2003-03-05 | $7700.00 | Window Closed / Lapsed |