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EP0452030A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Liquid crystal display and shading member therefore

Assignee: International Business Machines Corp
•
Filing: 1991-04-03
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Granted: —
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Expires: 2011-04-03
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Abstract

Abstract The present invention relates to a liquid crystal display having a shading member, and in particular to a method of manufacturing such a shading member. The method comprises the steps of: forming an ITO film on a transparent substrate; and selectively reducing a specified region of said ITO film in order to decrease the transparency of the region of said ITO film. In this way the shading member is formed in the ITO film that forms the common electrode, and hence provides a compact arrangement. The shading member formed by this method, when incorporated in a liquid crystal display, absorbs both background light and light incident on it from a back light and so reduces the amount of light entering the transistors of the display.

Inventors

  • 👤 Yoshimasa Kaida

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 11:07
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/133509; G02F1/133512; G02F1/1343; G02F1/13439; G02F1/136; G02F1/1362; G02F1/1368

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 24 words
A liquid crystal display characterized in that a material obtained by reducing indium-tin-oxide (hereinafter referred to as ITO) is used as a shading material.
Claim 2
Dependent Claim 63 words
A liquid crystal display as claimed in Claim 1, comprising an array of transistors to drive associated display electrodes, said shading material being formed in regions of a layer of ITO, said regions being aligned with said transistors to reduce the amount of light incident on said transistors, and said layer of ITO serving as a common electrode for the liquid crystal display.
Claim 3
Dependent Claim 33 words
A liquid crystal display as claimed in Claim 2 in which said transistors are connected by drive conductors, and said regions extend across said layer of ITO in substantial alignment with said conductors.
Claim 4
Dependent Claim 36 words
A liquid crystal display as claimed in Claim 2 or Claim 3, wherein said display electrodes are formed from a second layer of ITO supported on a substrate, and said transistors are disposed on said substrate.
Claim 5
Independent Claim 47 words
A method of manufacturing a shading member for a liquid crystal display comprising the steps of: forming an ITO film on a transparent substrate; and selectively reducing a specified region of said ITO Film in order to decrease the transparency of the region of said ITO Film.
Claim 6
Dependent Claim 62 words
A method of manufacturing a shading member as claimed in Claim 5, further comprising the steps of: providing a protective mask on the region other than said specified region of the ITO film; immersing said ITO film provided with said protective mask in an electrically conductive solution containing hydrogen; and applying a voltage to said ITO film in said electrically conductive solution.
Claim 7
Dependent Claim 21 words
A method of manufacturing a shading member as claimed in Claim 6 wherein a photoresist is used as said protective mask.

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