US4904989A
Expired / Lapsed
US
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Display device
Assignee: Hitachi Ltd
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Filing: 1987-10-30
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Granted: 1990-02-27
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Expires: 2007-10-30
Abstract
Abstract In a display device having, at least, picture elements which are arrayed on a transparent insulating substrate, and transistor portions which are formed of a semiconductor layer formed on the transparent insulating substrate; a display device characterized in that, at least, interconnection parts of the transistor portions extend above the semiconductor layer formed on the transparent insulating substrate. The disconnection of the interconnection parts can be avoided.
Inventors
- 👤 Makoto Matsui
- 👤 Jun-ichi Ohwada
- 👤 Yasuhiro Shiraki
- 👤 Eiichi Maruyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:51
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/1368; H; H10; H10W; H10W72/00; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133512; G02F2202/00; G02F2202/10; G02F2202/104
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
An active matrix display device comprising: picture elements which are arrayed on a transparent insulating substrate; a semiconductor layer formed on said transparent insulating substrate; a transistor matrix which is formed using said semiconductor layer; and bus conductors coupled to said transistor matrix, wherein said semiconductor layer is formed in the shape of a mesh, and said bus conductors extend only inside an area where said mesh-shaped semiconductor layer exists so as not to extend over edges of said mesh-shaped semiconductor layer.
Claim 2
Dependent Claim
82 words
An active matrix display device comprising: picture elements which are arrayed on a transparent insulating substrate; a semiconductor layer formed on said transparent insulating substrate; a transistor matrix which is formed using said semiconductor layer; and bus conductors coupled to said transistor matrix, wherein said semiconductor layer is formed in the shape of a mesh, and said bus conductors extend only inside an area where said mesh-shaped semiconductor layer exists so as not to extend over edges of said mesh-shaped semiconductor layer.
Claim 3
Dependent Claim
21 words
An active matrix display device defined in claim 1, wherein said bus conductors are column electrode buses and row electrode buses.
Claim 4
Dependent Claim
19 words
An active matrix display device defined in claim 1, wherein said picture elements are picture elements utilizing liquid crystal.
Claim 5
Dependent Claim
18 words
An active matrix display device defined in claim 1, wherein said picture elements are picture elements utilizing electroluminescence.
Claim 6
Dependent Claim
27 words
An active matrix display device defined in claim 1, wherein said transistor matrix is comprised of transistors having a pn junction in source and drain contact regions.
Claim 7
Dependent Claim
18 words
An active matrix display device defined in claim 1, wherein said semiconductor layer is formed of polycrystalline silicon.
Claim 8
Dependent Claim
18 words
An active matrix display device defined in claim 1, wherein said transparent insulating substrate is formed of quartz.
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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) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |