Liquid crystal display device and driving method thereof
AssigneeLG Display Co., Ltd.
InventorsTae Wook Lee, Ji Kyoung Kim
Life of this patent
Estimating the term…
Abstract
An LCD device adapted to apply an optimized luminance in correspondence with a brightness of each divisional region of image is disclosed. The LCD device uses dimming curves, which are provided differently from each other, for divisional regions which are divided from one frame and have different pixel numbers. Therefore, the LCD device can a luminance optimized to a brightness of each divisional region of image, thereby preventing a luminance mismatching phenomenon and a luminance nullity phenomenon.
Claims16
A liquid crystal display device comprising:
- a liquid crystal panel with a plurality of pixels arranged in a matrix;
- a backlight controller that generates at least two PWM signals for lights different from each other in luminance, the lights applied to at least two divisional regions divided from an image of one frame which is displayed on the liquid crystal panel;
- a backlight unit including at least two blocks defined opposite the divisional regions;
- and
- a backlight driver that supplies the blocks of the backlight unit with at least two drive signals corresponding to the PWM signals.
A method of driving a liquid crystal display device which includes a liquid crystal panel with a plurality of pixels arranged in a matrix and a backlight unit with at least two blocks, comprising:
- dividing an image of one frame, which will be displayed on the liquid crystal panel, into at least two regions opposite to the blocks;
- generating a dimming address in accordance with a mean brightness value of each of the divided regions;
- generating a dimming signal, opposite to the generated dimming address, for each of the divided regions on the basis of dimming curves which are provided for each of the divided regions;
- and
- generating PWM signals each corresponding to the dimming signals for the divided regions and applying the PWM signals to the blocks of the backlight unit.
Dependencies are inferred from the claim text.