Patent ID: 7898513
Filing Date: 2011-03-01
Classification: G09G

Abstract:
1. An apparatus for driving an LCD device, comprising: an image display unit that displays an image; a data driver that supplies video signals to the image display unit; a gate driver that supplies scan signals to the image display unit; a frame varying unit that detects a motion vector from externally input source data and that generates modulated data and a frame variable signal that varies the number of frames of the image displayed in the image display unit in response to the motion vector; and a timing controller that aligns the modulated data to supply the aligned data to the data driver, generates data control signals that drive the data driver, and generates gate control signals that drive the gate driver, wherein the frame varying unit includes: a data modulator that generates the frame variable signal by detecting the motion vector from a luminance component of the source data, generates the modulated data to obtain the number of frames corresponding to the frame variable signal, and supplies the generated frame variable signal and the generated modulated data to the timing controller; and a frequency converter that generates a frame synchronizing signal that corresponds to the number of frames by varying an externally input reference frame synchronizing signal in response to the frame variable signal, and supplies the generated frame synchronizing signal to the timing controller, wherein the data modulator includes: an inverse gamma converter that performs inverse gamma correction for the source data for each unit of frame to generate first data including first red, green and blue (hereafter, R/G/B) signals; a luminance/chrominance separator that separates the first data into a luminance component and chrominance components; an image modulator that generates the frame variable signal by detecting the motion vector using a luminance component of a previous frame and a luminance component of a current frame supplied from the luminance/chrominance separator, and generates a modulated luminance component as the modulated data in response to the frame variable signal; a delay unit that delays the chrominance components of at least one frame unit while the image modulator generates the modulated luminance component and then that output the delayed chrominance components to synchronize with the modulated luminance component; a mixing unit that mixes the modulated luminance component that is supplied from the image modulator with the delayed chrominance components supplied from the delay unit to generate second data including second R/G/B signals; and a gamma converter that performs gamma correction for the second data from the mixing unit to generate the modulated data, wherein the image modulator includes: a motion detector that detects the motion vector and then that detects the frame variable signal using the motion vector; a frame generator that generates the modulated luminance component in response to the frame variable signal; and a data filter that determines a still image and a moving image between adjacent frames using the modulated luminance component supplied from the frame generator and filters the modulated luminance component to generate undershoot only in a boundary between the still image and the moving image, wherein the motion detector includes: a frame memory that stores the luminance component supplied from the luminance/chrominance separator for each unit of frame; a motion vector generator that generates the motion vector using the luminance component of the current frame supplied from the luminance/chrominance separator and the luminance component of the previous frame supplied from the frame memory; and a comparator that generates the frame variable signal by comparing the motion vector with first and second reference values set differently from each other, wherein frame generator generates the modulated luminance component that includes a insertion frame using the luminance components of the previous and current frames, excluding the chrominance components from the luminance/chrominance separator.