US 11,749,163 B1
Color calibration device, color calibration method, and calibration table generation method
Wan-Nung Tsung, Taipei (TW); Jun-Yu Yang, Hsinchu (TW); Shang-Yu Su, Hsinchu County (TW); and Feng-Ting Pai, Hsinchu (TW)
Assigned to Novatek Microelectronics Corp., Hsinchu (TW)
Filed by Novatek Microelectronics Corp., Hsinchu (TW)
Filed on Mar. 28, 2022, as Appl. No. 17/705,419.
Int. Cl. G09G 3/20 (2006.01)
CPC G09G 3/2003 (2013.01) [G09G 2320/0242 (2013.01); G09G 2320/0693 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A color calibration device, comprising:
a calibration table circuit configured to provide a selected calibration table, wherein the selected calibration table comprises a plurality of zone calibration parameters, and each of the zone calibration parameters corresponds to a corresponding zone among a plurality of zones of a display panel;
a ratio circuit coupled to the calibration table circuit to receive the selected calibration table and configured to calculate a subpixel calibration parameter corresponding to a current subpixel according to at least one of the zone calibration parameters in the selected calibration table; and
an image processing circuit, coupled to the ratio circuit to receive the subpixel calibration parameter, and configured to calibrate original subpixel data of the current subpixel according to the subpixel calibration parameter to generate calibrated subpixel data of the current subpixel,
wherein the calibration table is generated by measuring a color space value of each of the zones, wherein each of the zones has a transformation function to convert original pixel data into the color space value; calculating Mt=TFi(Di*Pi) to obtain a zone calibration parameter Pi of a current zone, wherein Mt is a known color space value of a target zone among the zones, TFi( ) is the transformation function corresponding to the current zone among the zones, and Di is the original pixel data of the current zone; and filling the zone calibration parameter corresponding to each of the zones in the calibration table.