US5075674A
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Active matrix substrate for liquid crystal display
Assignee: Sharp Corp
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Filing: 1988-11-18
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Granted: 1991-12-24
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Expires: 2008-11-18
Abstract
Abstract An active matrix substrate for the liquid crystal display has a switching circuit for switching on each of picture elements which includes a corresponding gate bus line, source bus line and a switching transistor. Further, the switching circuit includes at least one redundant structure to avoid inoperativeness of the switching circuit.
Inventors
- 👤 Mikio Katayama
- 👤 Hirohisa Tanaka
- 👤 Yasunori Shimada
- 👤 Hiroshi Morimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:11
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/1368; G02F1/13624; G02F1/136259; G02F1/136263; G02F1/136268
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
142 words
A liquid crystal display device comprising: a transparent insulating substrate; a plurality of gate bus lines formed in parallel on a surface of said substrate; a plurality of source bus lines formed in parallel so as to cross said plurality of gate bus lines, wherein each source bus line is insulated from each gate bus line at the respective crossings; a plurality of transparent picture element electrodes, each of which is formed at a crossing of the gate bus lines and source bus lines; and a plurality of switching means, each for connecting a picture element electrode to a corresponding source and gate bus line, each of the plurality of source bus lines including a source bypass bus line, formed only at each crossing with the gate bus lines, thereby forming a pair of source bus lines crossing each gate bus line.
Claim 2
Dependent Claim
142 words
A liquid crystal display device comprising: a transparent insulating substrate; a plurality of gate bus lines formed in parallel on a surface of said substrate; a plurality of source bus lines formed in parallel so as to cross said plurality of gate bus lines, wherein each source bus line is insulated from each gate bus line at the respective crossings; a plurality of transparent picture element electrodes, each of which is formed at a crossing of the gate bus lines and source bus lines; and a plurality of switching means, each for connecting a picture element electrode to a corresponding source and gate bus line, each of the plurality of source bus lines including a source bypass bus line, formed only at each crossing with the gate bus lines, thereby forming a pair of source bus lines crossing each gate bus line.
Claim 3
Dependent Claim
50 words
The liquid crystal display device of claim 1, wherein each said gate bus line includes a bypass bus line as a redundant structure, said bypass bus line being terminated prior to said gate and source bus line crossing, thereby forming a pair of gate buslines between adjacent source bus lines.
Claim 4
Dependent Claim
34 words
The liquid crystal display device of claim 2, wherein each said gate bus line is formed of a double layered, thickness structure, at least in the area in which said bypass line is formed.
Claim 5
Dependent Claim
33 words
The liquid crystal display device of claim 1, wherein each said source bus line is formed of a double layered thickness structure, except in the crossing zone thereof with said gate bus line.
Claim 6
Dependent Claim
68 words
The liquid crystal display device of claim 1, wherein each of said plurality of switching means includes a plurality of thin film transistors connected in parallel between a common source bus line and a picture element electrode so as to form a plurality of redundant structures and further connected to a common gate line, extended from said gate bus line and formed parallel to said source bus line.
Claim 7
Dependent Claim
17 words
The liquid crystal display device of claim 5, wherein said plurality of thin film transistors equals two.
Claim 8
Dependent Claim
200 words
A liquid crystal display device comprising: a transparent insulating substrate; a plurality of gate bus lines formed in parallel on a surface of said substrate; a plurality of source bus lines formed in parallel so as to cross said plurality of gate bus lines, wherein each source bus line is insulated from each gate line at the respective crossing and includes a source bypass bus line, formed only at each crossing with the gate bus lines, thereby forming a pair of source bus lines crossing each gate bus line; a plurality of transparent picture element electrodes, each of which is formed of a crossing of the gate bus lines and source bus lines, each being connected to only one gate bus line and only one source bus line; and a plurality of switching means including a plurality of thin film transistors, in parallel, each connecting each said picture element to its corresponding only one source bus line; each of said gate bus line including a bypass bus line as a redundant structure, said bypass bus line being terminated prior to said gate and source bus line crossing, thereby forming a pair of gate bus lines between adjacent source bus lines.
Claim 9
Dependent Claim
200 words
A liquid crystal display device comprising: a transparent insulating substrate; a plurality of gate bus lines formed in parallel on a surface of said substrate; a plurality of source bus lines formed in parallel so as to cross said plurality of gate bus lines, wherein each source bus line is insulated from each gate line at the respective crossing and includes a source bypass bus line, formed only at each crossing with the gate bus lines, thereby forming a pair of source bus lines crossing each gate bus line; a plurality of transparent picture element electrodes, each of which is formed of a crossing of the gate bus lines and source bus lines, each being connected to only one gate bus line and only one source bus line; and a plurality of switching means including a plurality of thin film transistors, in parallel, each connecting each said picture element to its corresponding only one source bus line; each of said gate bus line including a bypass bus line as a redundant structure, said bypass bus line being terminated prior to said gate and source bus line crossing, thereby forming a pair of gate bus lines between adjacent source bus lines.
Claim 10
Dependent Claim
44 words
The liquid crystal display device of claim 7, wherein each of said plurality of thin film transistors of each said switching means, are further connected to a common gate electrode, extended from a gate bus line and formed parallel to a source bus line.
Claim 11
Dependent Claim
51 words
The liquid crystal display device of claim 8, wherein each said gate bus line includes a bypass bus line as a redundant structure, said bypass bus line being terminated prior to said gate and source bus line crossing, thereby forming a pair of gate bus lines between adjacent source bus lines.
Claim 12
Dependent Claim
34 words
The liquid crystal display device of claim 9, wherein each said gate bus line is formed of a double layered thickness structure, at least in the area in which said bypass line is formed.
Claim 13
Dependent Claim
32 words
The liquid crystal display of claim 7, wherein each said source bus line is formed of a double layered thickness structure except in the crossing zone thereof with said gate bus line.
Claim 14
Dependent Claim
17 words
The liquid crystal display device of claim 8, wherein the plurality of thin film transistors equals two.
Claim 15
Dependent Claim
223 words
The liquid crystal display device comprising: a transparent insulating substrate; a plurality of gate bus lines formed in parallel on a surface of said substrate; a plurality of source bus lines formed in parallel so as to cross said plurality of gate bus lines, wherein each source bus line is insulated from each gate bus line at the respective crossing; a plurality of transparent picture element electrodes, each of which is formed of a crossing of the gate bus lines and source bus lines, each being connected to only one gate bus line and only one source bus line; and a plurality of switching means, each for connecting a picture element electrode to a corresponding source and gate bus line, each of said plurality of switching means including a plurality of thin film transistors, in parallel, each connecting each said picture element to its corresponding only one source bus line and each of the plurality of thin film transistors further connected to a common gate electrode extended from a gate bus line and formed parallel to the source bus line; each of said gate bus lines including a bypass bus line as a redundant structure, said bypass bus line being terminated prior to said gate and source bus line crossing, thereby forming a pair of gate bus lines between adjacent source bus lines.
Claim 16
Dependent Claim
223 words
The liquid crystal display device comprising: a transparent insulating substrate; a plurality of gate bus lines formed in parallel on a surface of said substrate; a plurality of source bus lines formed in parallel so as to cross said plurality of gate bus lines, wherein each source bus line is insulated from each gate bus line at the respective crossing; a plurality of transparent picture element electrodes, each of which is formed of a crossing of the gate bus lines and source bus lines, each being connected to only one gate bus line and only one source bus line; and a plurality of switching means, each for connecting a picture element electrode to a corresponding source and gate bus line, each of said plurality of switching means including a plurality of thin film transistors, in parallel, each connecting each said picture element to its corresponding only one source bus line and each of the plurality of thin film transistors further connected to a common gate electrode extended from a gate bus line and formed parallel to the source bus line; each of said gate bus lines including a bypass bus line as a redundant structure, said bypass bus line being terminated prior to said gate and source bus line crossing, thereby forming a pair of gate bus lines between adjacent source bus lines.
Claim 17
Dependent Claim
34 words
The liquid crystal display device of claim 13 wherein each said gate bus line is formed of a double layered thickness structure, at least in the area in which said bypass line is formed.
Claim 18
Dependent Claim
45 words
The liquid crystal display of claim 13, where each of the plurality of source bus lines include a source bypass bus line, formed only at each crossing with the gate bus lines, thereby forming a pair of source bus lines crossing each gate bus line.
Claim 19
Dependent Claim
32 words
The liquid crystal display of claim 13, wherein each said source bus line is formed of a double layered thickness structure except in the crossing zone thereof with said gate bus line.
Claim 20
Dependent Claim
17 words
The liquid crystal display device of claim 13, wherein the plurality of thin film transistors equals two.
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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) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |