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EP0464897A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Active matrix liquid crystal display devices

Assignee: Philips Electronics UK Ltd
•
Filing: 1991-06-19
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Granted: —
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Expires: 2011-06-19
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Abstract

Abstract An active matrix liquid crystal display device comprises on a first substrate (30) a row and column array of picture element electrodes (20), associated switching devices (11), e.g. a-Si or polysilicon TFTs, and sets of row and column address conductors (14,16) to which selection and data signals are applied respectively, the picture elements being driven a row at a time in sequence by scanning the row conductors with a selection signal. Each switching device (11) is provided with a metal light shield (45) extending over the active region of the device (11) which is connected (46) electrically to the row address conductor (14) adjacent the one to which the switching device is connected. Because the adjacent row conductor is at a reference potential for most of the time parasitic capacitance effects due to the metal light shield are negligible.

Inventors

  • 👤 John Martin Shannon

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-05 09:55
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/136; G02F1/1362; G02F1/136209; G02F2202/00; G02F2202/10; G02F2202/103; G02F2202/104

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 151 words
An active matrix liquid crystal display device comprising first and second spaced supporting plates, a row and column array of picture elements each defined by a respective one of a set of electrodes carried on the first plate and an opposing electrode carried on the second plate with liquid crystal material there between, and a set of row address conductors on the first plate to which selection signals are applied by a driver circuit, each row of the picture element electrodes on the first plate being connected to an associated one of the set of row address conductors through a respective switching device on the first plate, and each switching device having an associated light shield carried on the first plate, characterised in that each light shield comprises a layer of metal which is connected electrically to a row address conductor adjacent the one to which the switching device is connected.
Claim 2
Dependent Claim 36 words
An active matrix liquid crystal display device according to Claim 1, characterised in that each light shield comprises a layer of metal extending from the switching device to, and contacting with, the adjacent row address conductor.
Claim 3
Dependent Claim 29 words
An active matrix liquid crystal display device according to Claim 1 or Claim 2, characterised in that each light shield is connected to the preceding adjacent row address conductor.
Claim 4
Dependent Claim 43 words
An active matrix liquid crystal display device according to any one of the proceeding claims, characterised in that the light shield extends over the switching device with the switching device being situated between the light shield and the surface of the first plate.
Claim 5
Dependent Claim 38 words
An active matrix liquid crystal display device according to any one of Claims 1 to 3, characterised in that light shield extends over the switching device and between the switching device and the surface of the first plate.
Claim 6
Dependent Claim 25 words
An active matrix liquid crystal display device according to any one of the preceding claims, characterised in that the switching devices comprise amorphous silicon TFTs.
Claim 7
Dependent Claim 26 words
An active matrix liquid crystal display device according to any one of Claims 1 to 5, characterised in that the switching devices comprise polycrystalline silicon TFTs.

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