Patent ID: 7522142
Filing Date: 2009-04-21
Classification: G09G

Abstract:
1. A liquid crystal display device comprising: a liquid crystal panel having crossing gate lines and data lines, the gate lines and the data lines defining pixels and including liquid crystal layer; a gate driver for providing scan signals to the gate lines of the liquid crystal panel; and a data driver for providing video data to the data lines of the liquid crystal panel, wherein the gate driver outputs a high-potential gate voltage to one gate line and outputs a low-potential gate voltage to the remaining gate lines, wherein the gate driver regulates that an output current of the low-potential gate voltage output to the remaining gate lines is different from that of the high-potential gate voltage output to the one gate; and wherein the gate driver includes: a gate shift register configured with a plurality of flip-flops for sequentially outputting predetermined control signals, each control signal being supplied to the corresponding AND gate and the corresponding output buffer; an AND operation unit configured with a plurality of AND gates corresponding to the plurality of flip-flops, for controlling the output of the control signals sequentially outputted from the flip-flops in response to a gate output enable signal; a level shifter configured with a plurality of sub-level shifters corresponding to the plurality of AND gates, for leveling a predetermined voltage according to the output signals of the AND gates; and a buffer unit configured with a plurality of output buffers corresponding to the plurality of sub-level shifters, for outputting the leveled voltages having different output current including high power current and low power current in response to the control signals sequentially outputted from the flip-flops, the different output current being set to each output buffer and one output current of the different output current being selected by each gate start pulse.