Patent ID: 9280941
Filing Date: 2016-03-08
CPC Classification: G09G

Claim Text:
1. A liquid crystal display device with a direct type backlight, comprising: a liquid crystal panel configured to display an image; a direct type backlight comprises a plurality of light emitting elements, which are divided into central light emitting elements and outer light emitting elements surrounding the central light emitting elements; a timing controller configured to generate a backlight control signal for controlling the plurality of light emitting elements based on a received external signal, the backlight control signal having a duty ratio; and a backlight driving circuit configured to generate a first light emission signal for driving the outer light emitting elements and a second light emission signal for driving the central light emitting elements according to the backlight control signal, wherein at least one of the duty ratio and a current level of the first light emission signal is configured to be greater than the corresponding duty ratio or current level of the second light emission signal, wherein the backlight driving circuit comprises: a first light emission control circuit for generating the first light emission signal based on a first high driving voltage and a low driving voltage, the first light emission signal having the same duty ratio as the duty ratio of the backlight control signal; and a second light emission control circuit for generating the second light emission signal based on a second high driving voltage and the low driving voltage, the second light emission signal having a duty ratio lower than the duty ratio of the backlight control signal, wherein the first light emission control circuit and the second light emission control circuit simultaneously apply the first light emission signal and the second light emission signal to the outer light emitting elements and the central light emitting elements, respectively.