US4717244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Active matrix addressed liquid crystal display wherein the number of overlap regions of the address line is reduced
Assignee: The General Electric Company PLC
•
Filing: 1986-03-18
•
Granted: 1988-01-05
•
Expires: 2006-03-18
Abstract
Abstract An active matrix addressed liquid crystal display is described, each liquid crystal cell within the display having two electrodes each carried on a surface of a different one of two insulating plates. Each cell is connected via a respective transistor to a pair of address lines each address line within a pair being connected to different cells within the array, and each line within a pair being carried on a different plate. Synchronized electrical pulses are applied to the address lines to switch on selected cells within the array, the sense of the pulses on one of the lines being periodically changed.
Inventors
- 👤 Cyril Hilsum
- 👤 Rene J. Van de Poel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:47
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; G02F2201/00; G02F2201/12; G02F2201/122
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
127 words
A liquid crystal display comprising: a two-dimensional array of pixels, each constituted by at least one liquid crystal cell, each cell having two electrodes, each carried on a surface of a respective one of two plates, each cell being connected to a pair of electrical address lines by a respective transistor means, each address line within a pair being connected to a different plurality of pixels within the array and being carried on a different one of the plates, each cell being switchable by means of electrical signals applied to selected ones of said pairs of address lines within the pixel connected to said selected pair, the pulses applied to the selected lines being such that the polarity of the voltage applied across each cell periodically alters.
Claim 2
Dependent Claim
127 words
A liquid crystal display comprising: a two-dimensional array of pixels, each constituted by at least one liquid crystal cell, each cell having two electrodes, each carried on a surface of a respective one of two plates, each cell being connected to a pair of electrical address lines by a respective transistor means, each address line within a pair being connected to a different plurality of pixels within the array and being carried on a different one of the plates, each cell being switchable by means of electrical signals applied to selected ones of said pairs of address lines within the pixel connected to said selected pair, the pulses applied to the selected lines being such that the polarity of the voltage applied across each cell periodically alters.
Claim 3
Dependent Claim
27 words
A display in accordance with claim 1 in which the transistor means is in the form of a thin film transistor carried on one of the plates.
Claim 4
Dependent Claim
36 words
A display in accordance with claim 2 in which each address line carried on the other plate to that carrying the transistor is a stripe of substantially the same width as a pixel of the display.
Claim 5
Dependent Claim
35 words
A display in accordance with claim 3 in which the width of each stripe carried on said other plate is narrowed in the region where it crosses the address lines carried on said one plate.
Claim 6
Dependent Claim
38 words
A display in accordance with claim 1 in which each transistor means is connected to one of the address lines via an individual conductive track which may be severed in the event of failure of the transistor means.
Claim 7
Dependent Claim
22 words
A display in accordance with claim 1 in which each pixel of the display includes a plurality of individual liquid crystal cells.
Claim 8
Dependent Claim
44 words
A display in accordance with claim 1 including means for applying said electrical signals to said selected address lines, said electrical signals being in the form of synchronized pulses, the sense of the pulses applied to one of the selected lines being periodically changed.
References Cited (Backward Citations)
US4094582A
Cited
DE2904596A1
Cited
GB2016780A
Cited
US4386352A
Cited
US4223308A
Cited
EP0070598A1
Cited
GB2103003A
Cited
GB2131217A
Cited
GB2129183A
Cited
GB2130781A
Cited
GB2133602A
Cited
GB2139795A
Cited
EP0136509A2
Cited
EP0145520A2
Cited
GB2173935A
Cited
JPH106193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |