EP0423824A2
Expired / Lapsed
EP
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Active matrix liquid crystal display element
Assignee: Philips Components Kobe KK
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Filing: 1990-10-19
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Granted: —
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Expires: 2010-10-19
Abstract
Abstract In an active matrix liquid crystal display element an internal short circuiting bus (32) is formed across source and gate buses (18,19) outside of a display region where thin film transistors (16) and pixel electrodes (15) are respectively arranged in a matrix form and inside of arrays of source and gate bus terminals. At intersections of the internal short circuiting bus (32) with the source bus (18) and the gate bus (19) coupling elements of a high resistance material are provided for connecting the internal short circuiting bus to the source bus and the gate bus, respectively.
Inventors
- 👤 Yasuhiro Ukai
- 👤 Tomihisa Sunata
- 👤 Teizo Yukawa
- 👤 Toshiya Inada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 19:11
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/136204
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
198 words
In an active matrix liquid crystal display element which has, on a transparent base plate, a plurality of equally-spaced-apart source and gate buses formed at right angles to each other, thin film transistors each connected to said source and gate buses at their intersecting point and formed at a corner in a pixel region defined by said intersecting source and gate buses, pixel electrodes each connected to one of said thin film transistors and formed over a wide area in said pixel region, and source and gate bus terminals connected to said source and gate buses at one end thereof, respectively, and formed along marginal edges of said transparent base plate, the improvement comprising: an internal short circuiting bus formed on said transparent base plate across said source and gate buses outside of a display region containing said thin film transistors and said pixel electrodes both arranged in a matrix form but inside of arrays of said source bus terminals and said gate bus terminals; and coupling elements each formed of a high resistance material on said transparent base plate in the vicinity of each said intersecting point of said source and gate buses, for electrically interconnecting them.
Claim 2
Dependent Claim
198 words
In an active matrix liquid crystal display element which has, on a transparent base plate, a plurality of equally-spaced-apart source and gate buses formed at right angles to each other, thin film transistors each connected to said source and gate buses at their intersecting point and formed at a corner in a pixel region defined by said intersecting source and gate buses, pixel electrodes each connected to one of said thin film transistors and formed over a wide area in said pixel region, and source and gate bus terminals connected to said source and gate buses at one end thereof, respectively, and formed along marginal edges of said transparent base plate, the improvement comprising: an internal short circuiting bus formed on said transparent base plate across said source and gate buses outside of a display region containing said thin film transistors and said pixel electrodes both arranged in a matrix form but inside of arrays of said source bus terminals and said gate bus terminals; and coupling elements each formed of a high resistance material on said transparent base plate in the vicinity of each said intersecting point of said source and gate buses, for electrically interconnecting them.
Claim 3
Dependent Claim
46 words
The display element of claim 1, further comprising an external short circuiting bus formed on said transparent base plate outside of and along said arrays of said source and gate bus terminals, said source and gate bus terminals being connected to said external short circuiting bus.
Claim 4
Dependent Claim
31 words
The display element of claim 1 or 2, wherein said coupling elements each include a semiconductor layer region formed simultaneously with a semiconductor layer of each of said thin film transistors.
Claim 5
Dependent Claim
82 words
The display element of claim 3, wherein each said coupling element includes said semiconductor layer region formed across each of said source and gate buses widthwise thereof, a gate insulating film formed on said semiconductor layer region common to all of said thin film transistors, and a hole formed in said gate insulating film overlying said semiconductor layer region, and said internal short circuiting bus is connected to said semiconductor layer region through said hole and extends on said gate insulating film.
Claim 6
Dependent Claim
99 words
The display element of claim 3, wherein each said coupling element includes a conductive land formed in adjacent but spaced relation to corresponding one of said source and gate buses, said semiconductor layer region extending from said conductor land to said corresponding source or gate bus, said gate insulating film extending from said thin film transistors to and overlying said semiconductor layer region, and a hole formed in said gate insulating film overlying said conductor land, and wherein said internal short circuiting bus is connected to said conductor land through said hole and extends on said gate insulating film.
Claim 7
Dependent Claim
23 words
The display element of claim 5, wherein said semiconductor layer region is formed adjacent a marginal edge of said internal short circuiting bus.
Claim 8
Dependent Claim
104 words
The display element of claim 3, wherein said gate buses are formed on said gate insulating film deposited all over said transparent base plate, each of said gate bus has at least at one end thereof a gate bus extension formed under said gate insulating film to extend therefrom and connected at one end thereof to the one end of said gate bus through a hole made in said gate insulating film, said gate bus terminals are each connected to the other end of said gate bus extension, and each said coupling element is formed on the intermediate portion of said gate bus extension.
Claim 9
Dependent Claim
65 words
The display element of claim 7, wherein said coupling element connected to said gate bus corresponding thereto has said semiconductor layer region formed under said gate insulating film and extending over said gate bus extension widthwise thereof, and said semiconductor layer region overlying said gate bus extension is connected to said internal short circuiting bus on said gate insulating film through a hole made therein.
Claim 10
Dependent Claim
74 words
The display element of claim 7, wherein said coupling element connected to said gate bus corresponding thereto includes a conductor land formed adjacent a corresponding one of said gate bus extensions under said gate insulating film and said semiconductor layer region extending from said conductor land to said corresponding gate bus extension, and said conductor land is connected to said internal short circuiting bus on said gate insulating film through a hole made therein.
Claim 11
Dependent Claim
59 words
The display element of claim 1 or 2, wherein said coupling elements are connected to said internal short circuiting bus connected to both ends of said gate and source buses, and said internal short circuiting bus is formed around said display region containing said thin film transistors and said pixel electrodes connected to said coupling elements corresponding thereto, respectively.
References Cited (Backward Citations)
No citation records indexed.
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