US5095304A
Expired / Lapsed
US
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Matrix display device
Assignee: US Philips Corp
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Filing: 1989-09-22
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Granted: 1992-03-10
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Expires: 2009-09-22
Abstract
Abstract In an active matrix addressed electro-optical, e.g. LC, display device of the kind comprising a row and column array of picture elements (12) each associated with a switching transistor (11) to which switching and data signals are supplied via switching and data signal conductors (14, 15) the transistors associated with alternate rows of picture elements are of opposite conductivity type (n,p) and the transistors of separate adjacent pairs of rows share a common switching signal conductor (14) to which switching signals for both conductivity types of transistors are applied, thereby reducing the number of such conductors. The transistors can be polysilicon or a-Si TFTs, or MOSFETs. CMOS technology may be used to produce also an integrated driver circuit (20).
Inventors
- 👤 Nigel D. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:34
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3648; G02F1/1333; G02F1/1345; G02F1/13454; G02F1/13624; G02F1/136245; G02F2202/00; G02F2202/10; G02F2202/103; G02F2202/104
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
110 words
A matrix display device comprising a row and column array of electro-optical picture elements defined by opposing electrodes with an electro-optical display medium disposed therebetween, and a switching transistor for each picture element to which switching and data signals are applied from driver means via a switching signal conductor and a data signal conductor, characterised in that for at least one pair of adjacent rows of picture elements the switching transistors associated with each row respectively are of opposite conductivity type and in that the switching transistors of both rows are connected to a common switching signal conductor to which switching signals for both types of switching transistors are supplied.
Claim 2
Dependent Claim
110 words
A matrix display device comprising a row and column array of electro-optical picture elements defined by opposing electrodes with an electro-optical display medium disposed therebetween, and a switching transistor for each picture element to which switching and data signals are applied from driver means via a switching signal conductor and a data signal conductor, characterised in that for at least one pair of adjacent rows of picture elements the switching transistors associated with each row respectively are of opposite conductivity type and in that the switching transistors of both rows are connected to a common switching signal conductor to which switching signals for both types of switching transistors are supplied.
Claim 3
Dependent Claim
25 words
A matrix display device according to claim 1, wherein the opposite conductivity switching transistors comprise n and p channel TFTs fabricated on a common substrate.
Claim 4
Dependent Claim
14 words
A matrix display device according to claim 2, wherein the TFTs comprise polysilicon TFTs.
Claim 5
Dependent Claim
14 words
A matrix display according to claim 2, wherein the TFTs comprise amorphous silicon TFTs.
Claim 6
Dependent Claim
15 words
A matrix display device according to claim 2, wherein the TFTs comprise recrystallised semiconductor TFTs.
Claim 7
Dependent Claim
25 words
A matrix display device according to claim 1, wherein the opposite conductivity switching transistors comprise n and p channel MOSFETs fabricated on a semiconductor substrate.
Claim 8
Dependent Claim
28 words
A matrix display device according to claim 2 wherein the switching signals are provided by a switching signal driver circuit fabricated on the substrate carrying the switching transistors.
Claim 9
Dependent Claim
22 words
A matrix display device according to claim 7, wherein the switching transistors and the driver circuit are fabricated by a CMOS process.
Claim 10
Dependent Claim
18 words
A matrix display device according to claim 1 wherein the electro-optical picture elements comprise liquid crystal picture elements.
Claim 11
Dependent Claim
28 words
A matrix display device according to claim 3, wherein the switching signals are provided by a switching signal driver circuit fabricated on the substrate carrying the switching transistors.
Claim 12
Dependent Claim
28 words
A matrix display device according to claim 4, wherein the switching signals are provided by a switching signal driver circuit fabricated on the substrate carrying the switching transistors.
Claim 13
Dependent Claim
28 words
A matrix display device according to claim 5, wherein the switching signals are provided by a switching signal driver circuit fabricated on the substrate carrying the switching transistors.
Claim 14
Dependent Claim
28 words
A matrix display device according to claim 6, wherein the switching signals are provided by a switching signal driver circuit fabricated on the substrate carrying the switching transistors.
Claim 15
Dependent Claim
22 words
A matrix display device according to claim 10, wherein the switching transistors and the driver circuit are fabricated by a CMOS process.
Claim 16
Dependent Claim
22 words
A matrix display device according to claim 11, wherein the switching transistors and the driver circuit are fabricated by a CMOS process.
Claim 17
Dependent Claim
22 words
A matrix display device according to claim 12, wherein the switching transistors and the driver circuit are fabricated by a CMOS process.
Claim 18
Dependent Claim
22 words
A matrix display device according to claim 13, wherein the switching transistors and the driver circuit are fabricated by a CMOS process.
Claim 19
Dependent Claim
18 words
A matrix display device according to claim 2, wherein the electro-optical picture elements comprise liquid crystal picture elements.
Claim 20
Dependent Claim
18 words
A matrix display device according to claim 14, wherein the electro-optical picture elements comprise liquid crystal picture elements.
Claim 21
Dependent Claim
18 words
A matrix display device according to claim 17, wherein the electro-optical picture elements comprise liquid crystal picture elements.
References Cited (Backward Citations)
US4822142A
Cited
US4917467A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-10 | 1995-09-09 | 1996-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-10 | 1999-09-09 | 2000-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-10 | 2003-09-09 | 2004-03-10 | $7700.00 | Window Closed / Lapsed |