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Color LCD including transistors having layer thicknesses selected for small photocurrents

  • US 5,132,821 A
  • Filed: 07/26/1990
  • Issued: 07/21/1992
  • Est. Priority Date: 08/16/1989
  • Status: Expired due to Fees
First Claim
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1. An active matrix liquid crystal display device comprising a multiplicity of liquid crystal display elements, each controlled by a thin film transistor, (TFT) having a gate layer, a semiconductor layer providing a channel region insulated from the gate layer by a gate insulation layer, and means for illuminating the display elements, the display elements comprising groups providing outputs of respective different colors, characterised in that the thickness of at least one of said layers of the TFTs differ from one group to another group and is selected in accordance with the color of light within which each group operates such that interference effects results in a small amount of absorption of said colored light in the semiconductor layer.

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