Patent US5392145A successfully refreshed from Google Patents.
US5392145A
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Liquid crystal display with light shielding matrix connected to conductive band for crosstalk shielding
Assignee: TPO Hong Kong Holding Ltd
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Filing: 1993-05-09
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Granted: 1995-02-21
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Expires: 2013-05-09
Abstract
Abstract A matrix liquid crystal display device of the kind having a light shielding matrix (18) in the form of a grid of electrically conductive material carried on the same plate (11) as one set of address conductors (20) and separated therefrom by an insulating layer (21), further includes a conductive band (30) which extends around and contacts the periphery of the grid (18) and exhibits less resistance per unit length than the portions (19) of conductive material constituting the grid, and which is connected at a plurality of points to a predetermined potential, e.g. ground, whereby cross-talk effects due to capacitive couplings between the matrix and the address conductors are reduced.
Inventors
- 👤 Martin J. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:21
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/1365; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133512
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
136 words
A liquid crystal display device comprising a row and column array of liquid crystal display elements defined between two plates which respectively carry sets of row and column address conductors, and a light shielding matrix of electrically conductive material in the form of a grid having portions extending between the display elements which is carried on one of the plates and electrically insulated from the set of address conductors on that plate, characterised in that the light shielding matrix is electrically connected around its periphery to a band of electrically conductive material having a resistance per unit length which is lower than that of the portions of the matrix, and in that the band is electrically connected at a plurality of spaced locations around the band to means for providing a predetermined potential to the matrix.
Claim 2
Dependent Claim
136 words
A liquid crystal display device comprising a row and column array of liquid crystal display elements defined between two plates which respectively carry sets of row and column address conductors, and a light shielding matrix of electrically conductive material in the form of a grid having portions extending between the display elements which is carried on one of the plates and electrically insulated from the set of address conductors on that plate, characterised in that the light shielding matrix is electrically connected around its periphery to a band of electrically conductive material having a resistance per unit length which is lower than that of the portions of the matrix, and in that the band is electrically connected at a plurality of spaced locations around the band to means for providing a predetermined potential to the matrix.
Claim 3
Dependent Claim
47 words
A liquid crystal display device according to claim 1, characterised in that the band is of the same material as, and integral with, the matrix and has for at least most of its length a width which is greater than that of the portions of the matrix.
Claim 4
Dependent Claim
33 words
A liquid crystal display device according to claim 2, characterized in that the band is connected to the means for providing a predetermined potential at least at two opposing corners of the band.
Claim 5
Dependent Claim
19 words
A liquid crystal display device according to claim 2, characterized in that the band extends continuously around the matrix.
Claim 6
Dependent Claim
32 words
A liquid crystal display device according to claim 1, characterised in that the band comprises a layer of material different to that of the matrix which contacts the matrix around its periphery.
Claim 7
Dependent Claim
33 words
A liquid crystal display device according to claim 5, characterized in that the band is connected to the means for providing a predetermined potential at least at two opposing corners of the band.
Claim 8
Dependent Claim
19 words
A liquid crystal display device according to claim 5, characterized in that the band extends continuously around the matrix.
Claim 9
Dependent Claim
33 words
A liquid crystal display device according to claim 1, characterised in that the band is connected to the means for providing a predetermined potential at least at two opposing corners of the band.
Claim 10
Dependent Claim
28 words
A liquid crystal display device according to claim 8, characterised in that the band is connected to the means for providing a predetermined potential at its four corners.
Claim 11
Dependent Claim
19 words
A liquid crystal display device according to claim 9, characterized in that the band extends continuously around the matrix.
Claim 12
Dependent Claim
19 words
A liquid crystal display device according to claim 1, characterised in that the band extends continuously around the matrix.
Claim 13
Dependent Claim
19 words
A liquid crystal display device according to claim 8, characterized in that the band extends continuously around the matrix.
References Cited (Backward Citations)
GB2091468A
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JPH01142533A
Cited
EP0333392A2
Cited
EP0338412A2
Cited
US5265273A
Cited
JPH0478822A
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US5285301A
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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) | 1998-02-20 | 1998-08-22 | 1999-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-02-20 | 2002-08-22 | 2003-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-02-20 | 2006-08-22 | 2007-02-21 | $7700.00 | Window Closed / Lapsed |