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Method and apparatus for optical inspection of a display

  • US 20040213449A1
  • Filed: 02/02/2004
  • Published: 10/28/2004
  • Est. Priority Date: 02/03/2003
  • Status: Active Grant
First Claim
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1. A method for a computer system comprises:

  • capturing a first and a second image of a pixel on a display at coordinates (m, n) with an array of R×

    S sensors in an image sensor;

    determining a first and a second set of coordinates on the image sensor that map to coordinates (m,n) on the display for a first and a second group of sub-pixels, respectively, in response to the first and second image, respectively;

    determining a first and a second misalignment angle between the pixel on the display and the array of R×

    S sensors for the first group and the second group of sub-pixels, respectively;

    determining a first and a second x magnification ratio of pixels in the display relative to sensors in the image sensor for the first group and the second group of sub-pixels;

    determining a first and a second plurality of weighting factors Wij, where i=1 to R, and j=1 to S, respectively associated with sensors from the array of R×

    S sensors in response to the first and second misalignment angle, and the first and the second x magnification ratio, respectively;

    determining a first and second plurality of luminance values Lij, where i=1 to R, and j=1 to S, respectively associated with the sensors from the array of R×

    S sensors;

    determining a first and second luminance value Imn, according to the following relationship;

    Imn=Σ

    (Wij*Lij) for i=I to R, and j=1 to S, in response to the first and second plurality of weighting factors and the first and second plurality of luminance values, respectively;

    forming a first and a second reduced scaled image including a plurality of pixels, wherein a luminance value for a pixel at coordinate (m,n) in the first and the second reduced scaled image is determined in response to the first and the second luminance value Imn, respectively; and

    inspecting the first and the second reduced scaled image to identify potential defects of the pixel on the display.

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