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Method of manufacturing a liquid crystal display panel including photoconductive electrostatic protection

  • US 5,233,448 A
  • Filed: 05/04/1992
  • Issued: 08/03/1993
  • Est. Priority Date: 05/04/1992
  • Status: Expired due to Term
First Claim
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1. A substrate for a liquid crystal display panel including a thin film transistor array comprising:

  • a flat transparent substrate;

    a plurality of spaced, parallel scan lines, and a plurality of spaced orthogonally arranged parallel data lines on said substrate;

    a plurality of contact pads adjacent to the periphery of said substrate that are electrically connected to said scan lines and said data lines;

    an array of thin film transistor display elements on said substrate that is operationally associated with said scan lines and said data lines;

    a first annular electrostatic discharge line on said substrate that is located adjacent the periphery of said substrate outwardly of said contact pads;

    a second annular electrostatic discharge line on said substrate located inwardly of said first discharge line and electrically connected to each of said contact pads; and

    a plurality of light controlled electrostatic discharge devices adjacent said pads, each of said electrostatic discharge devices having two terminals with one terminal joined to said first electrostatic discharge line, and with the other terminal joined to one of said pads.

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