Systems and methods of optical feedback
AssigneeIgnis Innovation Inc.
InventorGholamreza Chaji
Life of this patent
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Abstract
What is disclosed are systems and methods of optical feedback for pixel identification, evaluation, and calibration for active matrix light emitting diode device (AMOLED) and other emissive displays. Optical feedback is utilized to calibrate pixel whose output luminance exceeds a threshold difference from a reference value, and may include the use of sparse pixel activation to ensure pixel identification and luminance measurement, as well as a coarse calibration procedure for programming the starting calibration data for a fine calibration stage.
Claims20
An optical feedback method for calibrating an emissive display system having pixels, each pixel having a light-emitting device, the method comprising:
- iteratively performing a calibration loop until a number of pixels of the display determined to be uncalibrated is less than a threshold number of pixels, the calibration loop comprising:
- measuring the luminance of pixels of the display generating luminance measurements for each pixel;
- comparing luminance measurements for the pixels with reference values generating a difference value for each pixel measured;
- determining for each pixel whether the difference value exceeds a difference threshold, and for pixels having a difference value which does not exceed the difference threshold determining the pixel to be calibrated and storing currently used calibration data for the pixel as final calibration data for the pixel, and for pixels having a difference value which exceeds the difference threshold determining the pixel to be uncalibrated and adjusting the calibration data for the pixel with use of the luminance measurement for the pixel and previous calibration data for the pixel;
- programming each pixel whose calibration data was adjusted with the adjusted calibration data.
An optical feedback system for calibrating an emissive display system having pixels, each pixel having a light-emitting device, the system comprising:
- a display panel comprising said pixels;
- an optical sensor operative to measure luminance of pixels of the display panel;
- optical feedback processing coupled to the optical sensor;
- and
- a controller of the emissive display system coupled to said optical feedback processing and for iteratively controlling a calibration loop until a number of pixels of the display panel determined to be uncalibrated is less than a threshold number of pixels, iteratively controlling the calibration loop comprising:
- controlling the optical sensor and the optical feedback processing to measure the luminance of pixels of the display panel generating luminance measurements for each pixel;
- controlling the optical feedback processing to compare luminance measurements for the pixels with reference values generating a difference value for each pixel measured;
- controlling the optical feedback processing to determine for each pixel whether the difference value exceeds a difference threshold, and for pixels having a difference value which does not exceed the difference threshold to determine the pixel to be calibrated and store currently used calibration data for the pixel as final calibration data for the pixel, and for pixels having a difference value which exceeds the difference threshold to determine the pixel to be uncalibrated and adjust the calibration data for the pixel with use of the luminance measurement for the pixel and previous calibration data for the pixel;
- and
- programming each pixel whose calibration data was adjusted with the adjusted calibration data.
Dependencies are inferred from the claim text.