Patent US2415927A successfully refreshed from Google Patents.
EP0318224A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
An active matrix substrate for liquid crystal display
Assignee: Sharp Corp
•
Filing: 1988-11-21
•
Granted: —
•
Expires: 2008-11-21
Abstract
Abstract An active matrix substrate for the liquid crystal display has a switching circuit for switching on each of picture elements which is comprised of the corresponding gate bus line (21), source bus line (25) and a switching transistor (31) and the switching circuit includes at least one redundant structure for avoiding the inoperativeness of the switching circuit.
Inventors
- 👤 Mikio Katayama
- 👤 Hirohisa Tanaka
- 👤 Yasunori Shimada
- 👤 Hiroshi Morimoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 18:01
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: 11
Claim 1
Independent Claim
172 words
An active matrix substrate for the liquid crystal display comprising: a transparent insulated substrate; a plurality of gate bus lines being formed parallel to each other on a surface of said substrate; a plurality of source bus lines being formed so as to cross said plurality of gate bus lines in such a manner that each source bus line is insulated from gate bus lines at respective crossing areas with the latter bus lines; a plurality of transparent picture element electrodes each of which is formed in each area defined by adjacent gate bus lines and source bus lines; and a switching means for connecting a picture element electrode to a source bus line corresponding thereto when it is designated by the corresponding gate and source bus lines being characterized in that: a switching circuit for switching on each of picture elements which is comprised of the corresponding gate bus line, source bus line and the switching means includes at least one redundant structure for avoiding the inoperativeness of said switching circuit.
Claim 2
Dependent Claim
172 words
An active matrix substrate for the liquid crystal display comprising: a transparent insulated substrate; a plurality of gate bus lines being formed parallel to each other on a surface of said substrate; a plurality of source bus lines being formed so as to cross said plurality of gate bus lines in such a manner that each source bus line is insulated from gate bus lines at respective crossing areas with the latter bus lines; a plurality of transparent picture element electrodes each of which is formed in each area defined by adjacent gate bus lines and source bus lines; and a switching means for connecting a picture element electrode to a source bus line corresponding thereto when it is designated by the corresponding gate and source bus lines being characterized in that: a switching circuit for switching on each of picture elements which is comprised of the corresponding gate bus line, source bus line and the switching means includes at least one redundant structure for avoiding the inoperativeness of said switching circuit.
Claim 3
Dependent Claim
39 words
An active matrix substrate as claimed in claim 1, in which said gate bus line has a bypass bus line as said redundant structure, which bypasses a portion of said gate bus line inbetween the adjacent source bus line.
Claim 4
Dependent Claim
39 words
An active matrix substrate as claimed in claim 2, in which said gate bus line is formed double, when seen in the direction of the thickness thereof, at least in a range along which said bypass line is formed.
Claim 5
Dependent Claim
42 words
An active matrix substrate as claimed in claim 1, in which said source bus line has a bypass bus line as said redundant structure, which bypasses a portion of said source bus line at each crossing area with said gate bus line.
Claim 6
Dependent Claim
38 words
An active matrix substrate as claimed in claim 4, in which said source bus line is formed double, when seen in the direction of the thickness thereof, except for the crossing zone thereof with said gate bus line.
Claim 7
Dependent Claim
40 words
An active matrix substrate as claimed in claim 1, in which said switching means is comprised of two thin film transistors connected parallel between the source bus line and the picture element electrode so as to form said redundant structure.
Claim 8
Dependent Claim
160 words
An active matrix substrate for a matrix display of the kind in which an array of display elements is controlled by a corresponding array of switching means, each arranged to control the display state of a respective said display element, said substrate including an array of display element electrodes, a plurality of parallel source lines and, a plurality of parallel gate lines extending in a direction across said source lines, said switching means being also part of the substrate and each arranged to supply an energizing voltage to the associated display element electrode when a given source line/gate line pair connected to that switching means is selected, wherein for at least some of said display element electrodes, a switching circuit which comprises the respective switching means and associated portions of the gate and source lines in the region of said display element electrode also includes a redundancy element which normally duplicates the function of a part of said switching circuit.
Claim 9
Dependent Claim
160 words
An active matrix substrate for a matrix display of the kind in which an array of display elements is controlled by a corresponding array of switching means, each arranged to control the display state of a respective said display element, said substrate including an array of display element electrodes, a plurality of parallel source lines and, a plurality of parallel gate lines extending in a direction across said source lines, said switching means being also part of the substrate and each arranged to supply an energizing voltage to the associated display element electrode when a given source line/gate line pair connected to that switching means is selected, wherein for at least some of said display element electrodes, a switching circuit which comprises the respective switching means and associated portions of the gate and source lines in the region of said display element electrode also includes a redundancy element which normally duplicates the function of a part of said switching circuit.
Claim 10
Dependent Claim
47 words
A matrix display device in which an array of display elements are controlled by a corresponding array of switching circuits formed on a substrate which also carries electrodes of the display elements, a said switching circuit including a redundancy structure for inhibiting inoperativeness of said switching circuit.
Claim 11
Dependent Claim
47 words
A matrix display device in which an array of display elements are controlled by a corresponding array of switching circuits formed on a substrate which also carries electrodes of the display elements, a said switching circuit including a redundancy structure for inhibiting inoperativeness of said switching circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.