Patent ID: 7893905
Filing Date: 2011-02-22
Classification: G09G,H04N

Abstract:
1. An apparatus for driving a liquid crystal display device including an image display unit including liquid crystal cells, a plurality of gate lines and a plurality of data lines, the apparatus comprising: a converter for detecting a motion vector from externally input source data, converting one frame of an input original image of the input source data into at least two conversion frames, filtering images of the at least two conversion frames according to the motion vector, and generating modulated data; a gate driver for supplying a scan signal to the gate lines; and a data driver for converting the modulated data into an analog video signal and supplying the analog video signal to the data lines, wherein the converter comprises: a first gamma correcting unit for gamma-correcting the input source data in the one frame and generating first data; a brightness/color separating unit for dividing the first data into a brightness component and a color component; an image modulating unit for detecting the motion vector from the brightness component, converting the brightness component of the one frame into the at least two conversion frames, and filtering the images of the at least two conversion frames according to the motion vector, and generating modulated brightness component; a delay unit for delaying the color component while the image modulating unit generates the modulated brightness component; a mixing unit for mixing the modulated brightness component with the delayed color component and generating second data; and a second gamma correcting unit for gamma-correcting the second data supplied from the mixing unit and generating the modulated data, wherein the image modulating unit comprises: a memory unit for storing the brightness component in the one frame supplied from the brightness/color separating unit; a double frame converting unit for converting the brightness component of the input original image in the one frame supplied from the memory unit into first and second conversion frames corresponding to the input original image and sequentially outputting the first and second conversion frames; a motion detecting unit for setting a Gaussian filter coefficient and a sharpness filter coefficient according to a frame control signal using a brightness component of a previous frame and a brightness component of a current frame of the input original image supplied from the memory unit and detecting a motion size signal of a moving image, wherein the Gaussian filter coefficient is set such that the gradient of the boundary of a moving image in the conversion frames becomes smooth and wherein the sharpness filter coefficient is set such that an undershoot is generated in the boundary; a motion filter unit for filtering the brightness components of the conversion frames according to the Gaussian filter coefficient and the sharpness filter coefficient; and a multiplying unit for multiplying the brightness components of the conversion frames filtered by the motion filter unit with the motion size signal and supplying the multiplied signal to the mixing unit.