Patent ID: 7317462

Claim:
A method for luminance compensation of liquid crystal display including the following steps: (1) measuring an original gamma curve of a panel; (2) setting a target gamma curve; (3) inputting an initial gray level to obtain a luminance corresponding to the target gamma curve and finding an adjusted gray level for expressing a luminance from the original gamma curve; (4) repeating (2) and (3) steps to produce plural groups of initial gray levels and plural groups of adjusted gray levels and set the plural groups of adjusted gray levels into a proportion array; (5) repeating (2), (3), and (4) steps to produce plural groups of proportion arrays from different target curves and make a lookup table; (6) calculating a quantity distribution of input gray levels of images; (7) respectively calculating a dark level proportion and a bright level proportion; (8) selecting a corresponding proportion array according to the value of dark level proportion from a lookup table of dark levels and substituting the adjusted gray level in the proportion array for the input gray level; (9) selecting a corresponding proportion array according to the value of bright level proportion from a lookup table of bright levels and substituting the adjusted gray level in the proportion array for the input gray level; and (10) outputting the adjusted gray levels for adjusting a signal intensity to improve the image quality; whereby the method being able to adjust the input signal intensity and obtain better image quality and wherein the dark level proportion is the ratio of the gray level quantity in a dark level interval to a total gray level quantity, and the range of a dark level interval is from below a specific value in a total gray level range; the bright level proportion is the ratio of the gray level quantity in bright level interval to the total gray quantity, and the range of the bright level interval is from above a specific value in the total gray level range.