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Method and apparatus for automatically inspecting and repairing an active matrix LCD panel

  • US 5,235,272 A
  • Filed: 06/17/1991
  • Issued: 08/10/1993
  • Est. Priority Date: 06/17/1991
  • Status: Expired due to Term
First Claim
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1. A method for identifying pixel defects on an active plate having a pixel array, a plurality of pixel drive elements and a matrix of data lines and gate lines, each one pixel in the array being coupled to one gate line and one data line in the matrix by a pixel drive element, a plurality of data lines of the matrix terminating at a first shorting means, a plurality of gate lines terminating at a second shorting means, the method comprising the steps of:

  • applying a first timing pattern to the first shorting means and second shorting means;

    capturing a voltage image of a first area of the active plate to obtain first pixel voltage data for pixels within said first area;

    applying a second timing pattern to the first shorting means and second shorting means;

    capturing a second voltage image of a second area of the active plate to obtain second pixel voltage data for pixels within said second area; and

    comparing the first pixel voltage data and the second pixel voltage data to identify each pixel common to said first area and to said second area which has a short circuit to a data line.

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