Brightness compensation method and local dimming circuit and liquid crystal display thereof

摘要

The present invention discloses a brightness compensation method. The brightness compensation method includes controlling a plurality of backlights of a plurality of display areas to turn on with a plurality of backlight intensity; calculating a plurality of total backlight intensity; calculating a plurality of actual backlight intensity according to the plurality of total backlight intensity and a backlight scanning ratio; dividing a plurality of maximum backlight intensity when the plurality of backlights are fully turned on by the plurality of actual backlight intensity, to generate a plurality of compensation gains; and displaying a compensated image data with a plurality of compensated image intensity after compensating a plurality of image intensity corresponding to the plurality of display area of an image data with the plurality of compensation gains.

主权项

1. A brightness compensation method for a liquid crystal display (LCD), comprising:
performing local dimming to a plurality of display areas of the liquid crystal display according to an image data, to control a plurality of backlights of the plurality of display areas to turn on with a plurality of backlight intensity; calculating a plurality of total backlight intensity of the plurality of display areas according to a plurality of leakage coefficients; calculating a plurality of actual backlight intensity of the plurality of display areas according to the plurality of total backlight intensity and a backlight scanning ratio; dividing a plurality of maximum backlight intensity when the plurality of backlights are fully turned on by the plurality of actual backlight intensity, to generate a plurality of compensation gains; and displaying a compensated image data with a plurality of compensated image intensity after compensating a plurality of image intensity corresponding to the plurality of display areas of the image data with the plurality of compensation gains; wherein the step of performing local dimming to the plurality of display areas of the liquid crystal display according to the image data, to control the plurality of backlights of the plurality of display areas to turn on with the plurality of backlight intensity comprises:
determining degrees of the plurality of backlight intensity with a recursive way according to the image data and a plurality of actual backlight intensity of a previous image data andnormalizing the plurality of actual backlight intensity of the previous image data before calculating a difference between the plurality of image intensity of the plurality of display areas corresponding to the image data and the plurality of actual backlight intensity of the previous image data.