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LCD error detection system

  • US 4,870,357 A
  • Filed: 06/03/1988
  • Issued: 09/26/1989
  • Est. Priority Date: 06/03/1988
  • Status: Expired due to Term
First Claim
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1. A process for detecting faulty liquid crystal display (LCD) cells in an (LCD) device comprising the steps:

  • (1) displaying a first image (image A) on said LCD device;

    (2) scanning and electronically storing said first image;

    (3) displaying a second image (image B) on said LCD device where said second image is the inverse of said first image;

    (4) scanning and electronically storing said second image;

    (5) generating a third image (image A+B) from the matrix addition of said first and second images;

    (6) selecting a threshold value to minimize processing time;

    (7) analyzing a thresholded image generated from said third image;

    (8) generating a bit map from said threshold image;

    (9) locating the position of faulty LCD cells in said LCD device after conducting a connectivity analysis on said bit map;

    (10) outputting the results of said locating step, such that the locations of said faulty LCD cells are provided.

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