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Assuring uniformity in the output of an OLED

  • US 7,859,492 B2
  • Filed: 06/07/2006
  • Issued: 12/28/2010
  • Est. Priority Date: 06/15/2005
  • Status: Active Grant
First Claim
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1. A method for generating correction data for pixels in an organic LED display device including a plurality of the pixels in a matrix pattern, each pixel including an organic LED dement, comprising:

  • a) dividing a display area into a plurality of predetermined detection areas to selectively cause organic LED elements of a plurality of pixels in the detection areas to emit light to detect a driving current for each detection area;

    b) detecting, based on driving current values detected for respective detection areas, a detection area that includes a plurality of pixels, has a luminance value different from that of other detection areas and requires correction;

    c) calculating correction data required for correcting image data for each pixel in the detection area that requires correction, the calculation including;

    i) selecting a pixel area that is positioned around the detection area;

    ii) simultaneously activating a plurality of selected periphery pixels of the pixel area at a first input voltage level, and at a second voltage level, and measuring corresponding currents for each voltage level, to provide an average V-I characteristic of the pixel area, wherein the selected periphery pixels are outside the detection area;

    iii) while no other pixels are active, sequentially activating each pixel in the detection area at a third input voltage level and at a fourth input voltage level and measuring corresponding currents for each voltage level to provide a respective V-I characteristic of each pixel in the detection area; and

    iv) calculating, for each pixel in the detection area, correction data including a gain correction value and an offset of the V-I characteristic of the pixel with reference to the average V-I characteristic; and

    d) storing, in a memory, the correction data calculated for each pixel in the detection area.

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