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METHODS OF GRAYSCALE CALIBRATION OF SUBPIXELS OF LIQUID CRYSTAL PANELS DURING IMAGING

  • US 20160343289A1
  • Filed: 05/21/2015
  • Published: 11/24/2016
  • Est. Priority Date: 05/21/2015
  • Status: Active Grant
First Claim
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1. A method of grayscale calibration of subpixels of liquid crystal panels during imaging, each of the pixels of the liquid crystal panel comprises a plurality of subpixels of n number of colors, wherein n is an integer larger than 0, each of the subpixels comprises a main subpixel area and a secondary subpixel area, the method comprising:

  • (a) measuring a Gamma curve of i-th color among n numbers of colors under a direct view condition to obtain a first brightness value when the subpixel of the i-th color has a maximum grayscale (m), wherein iε

    [1, n];

    (b) calculating a second brightness value L(j) corresponding to each of grayscale of the subpixel of the i-th color in accordance with the first brightness value and a predetermined Gamma value, wherein jε

    [t, m], t representing a minimum grayscale;

    (c) obtaining a third brightness value Lm(r) corresponding to each of the grayscale (r) of the main subpixel area of the subpixel of the i-th color is calculated under the direct view condition, wherein rε

    [t, m];

    (d) obtaining a fourth brightness value Ls(s) corresponding to each of the grayscale of the secondary pixel area of the subpixel of the i-th color under the direct view condition, wherein sε

    [t, m];

    (e) determining value combinations for the grayscale of the main subpixel area and the grayscale of the secondary subpixel area of the subpixel of the i-th color basing on the second brightness value L(j), and the third brightness value Lm(r) and the fourth brightness value Ls(s) corresponding to the j-th grayscale satisfying a predetermined criteria;

    (f) calculating total color differences of the grayscale images respectively for the direct view condition and a squint view condition for the subpixel of the i-th color having the grayscale (j) when the value combination being applied; and

    (g) determining the value combination corresponding to the minimum total color difference as the value combination applied for the subpixel of the i-th color having the grayscale (j).

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