Assuring uniformity in the output of an OLED
First Claim
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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Abstract
A display area of a display panel is divided into a plurality of areas, and a current detector detects a driving current (i.e. CV current) that flows when light is emitted from an area or a block including a plurality of areas. Such current detection is repeated while sequentially changing the target area or block and a CPU detects an area that has a current value different from that of other areas (i.e. an area that requires correction) based on results of the results of current detection. A similar process is performed on smaller areas obtained by subdividing the area to find a smaller area that requires correction. Thus, a correction value is obtained for each pixel and the correction values are efficiently calculated.
191 Citations
11 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification