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EP0179922A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Color liquid crystal display element

Assignee: Philips Components Kobe KK
•
Filing: 1985-04-19
•
Granted: —
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Expires: 2005-04-19
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Abstract

Abstract A color liquid crystal display element in which a liquid crystal (14) is contained between a first clear substrate (11) and a second clear substrate (12), a plurality of display electrodes (15) and thin-film transistors (16) connected thereto are formed on the first clear substrate (11), color filters (1R), (1G) and (1B) are formed on the second clear substrate (12) in a manner to be opposite to the display electrodes (15), and a common electrode (17) is also formed on the whole surface thereof. When light is transmitted ' through the gaps in the color filters (1R), (1G), (1B), contrast ' decreases. Further, voltage drop on the common electrode (17) leads to uneven contrast. With this invention, therefore, gaps among the color filters are covered with a metallic light-shielding layer (37) to interrupt the passage of light. The light-shielding layer is further superposed on the common electrode (17) and is electrically connected thereto.

Inventors

  • 👤 Shigeo Aoki
  • 👤 Katsumi Miyake
  • 👤 Yasuhiro Ugai

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-30 19:05
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133512; G02F1/133514; G02F1/136; G02F1/1362; G02F1/1368

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 124 words
A color liquid crystal display device comprising first and second transparent substrates spaced apart a small distance and facing each other, a liquid crystal sealed between said two transparent substrates, a plurality of transparent display electrodes provided on the inner side surface of said first transparent substrate, thin film transistors formed on said first transparent substrate and each connected to each of said display electrodes, a transparent common electrode formed substantially on the entire inner side surface of said second transparent substrate, and color filters each facing each of said display electrodes, wherein: the gap between adjacent ones of said color filters is closed by a metal layer capable of blocking light, said light-blocking layers being overlaid over and interconnected by said common electrode.
Claim 2
Dependent Claim 124 words
A color liquid crystal display device comprising first and second transparent substrates spaced apart a small distance and facing each other, a liquid crystal sealed between said two transparent substrates, a plurality of transparent display electrodes provided on the inner side surface of said first transparent substrate, thin film transistors formed on said first transparent substrate and each connected to each of said display electrodes, a transparent common electrode formed substantially on the entire inner side surface of said second transparent substrate, and color filters each facing each of said display electrodes, wherein: the gap between adjacent ones of said color filters is closed by a metal layer capable of blocking light, said light-blocking layers being overlaid over and interconnected by said common electrode.
Claim 3
Dependent Claim 31 words
The color liquid crystal display device according to claim 1, wherein said common electrode is formed on the side of said color filters and light-blocking layers opposite said second transparent substrate.
Claim 4
Dependent Claim 28 words
The color liquid crystal display device according to claim 2, wherein said light-blocking layers partly overlie over said color filters on the side opposite said second transparent substrate.
Claim 5
Dependent Claim 108 words
The color liquid crystal display device according to one of claims 1 to 3, wherein said display electrodes are picture element electrodes and are arranged in a matrix array, the source electrodes of the thin film transistors connected to the picture element electrodes in each column of said matrix array are connected to a common source bus, the gate electrodes of the thin film transistors connected to the picture element electrodes in each row of said matrix array are connected to a common gate bus, and said color filters consist of those of a plurality of different colors, the color filters of like color being distributed substantially uniformly.

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