Patent ID: 10235946

Abstract:
An apparatus for controlling liquid crystal display brightness includes: a subarea image grayscale determining section configured to determine image grayscale values of subarea image data blocks corresponding to backlight subareas according to a received image signal; a subarea backlight value pre-obtaining section configured to pre-obtain subarea backlight values corresponding to the subarea image data blocks according to the image grayscale values of the subarea image data blocks; a subarea backlight value gain section configured to multiply the pre-obtained subarea backlight values with a preset backlight value gain coefficient to obtain gained backlight values of the backlight subareas, wherein the preset backlight value gain coefficient is more than 1; a subarea backlight value adjusting section configured to obtain a subarea backlight value adjustment coefficient, and to further multiply the gained subarea backlight values with the corresponding backlight value adjustment coefficient to obtain adjusted subarea backlight values, wherein if the pre-obtained subarea backlight value or the gained subarea backlight value is below a first threshold, then the corresponding backlight value adjustment coefficient is less than 1; and a subarea backlight value outputting section configured to output the respective adjusted subarea backlight values to driver circuits of backlight sources in the corresponding backlight subareas to control the brightness of the backlight sources in the corresponding backlight subareas as a result of driving.