Patent ID: 8212751
Filing Date: 2012-07-03
Classification: G09G

Abstract:
1. A liquid crystal display device comprising: a first modulator that primarily modulates digital video data, which are to be displayed in a liquid crystal display panel, with pre-stored first compensation values to adjust a contrast ratio of the liquid crystal display panel, wherein the first modulator analyzes a brightness of the digital video data, primarily modulates the digital video data with the first compensation values according to the brightness analysis result to increase the brightness value of the digital video data which are to be displayed at a bright image part, but to decrease the brightness value of the digital video data which are to be displayed at a relatively dark image part, and adjusts a brightness of a backlight unit according to the brightness analysis result; a second modulator that inputs the modulated digital video data from the first modulator and secondarily modulates the modulated digital video data with pre-stored second compensation values in order to increase a response speed of liquid crystal of the liquid crystal display panel, wherein the second modulator compares the modulated digital video data of a previous frame with that of a current frame, selects the second compensation value according to the comparison result, and modulates the modulated digital video data with the selected second compensation value, wherein if the modulated digital video data of the current frame is larger than that of the previous frame, the modulated digital video data of the current frame is modulated with a value which is larger than that of the current frame, wherein if the modulated digital video data of the current frame is smaller than that of the previous frame, the modulated digital video data of the current frame is modulated with a value which is smaller than that of the current frame, and if the modulated digital video data of the current frame is the same as that of the previous frame, the modulated digital video data of the current frame is modulated with a value which is the same as that of the current frame; and a third modulator that inputs the secondarily-modulated digital video data from the second modulator and further modulates the secondarily-modulated digital video data, wherein the secondarily-modulated digital video data includes at least one of first and second video data, the first video data to be displayed at a defect display area of which the brightness appears different from that of a normal display surface when displaying the same gray level in the liquid crystal display panel, and the second digital video data to be displayed at a link sub-pixel to which a defect sub-pixel and an adjacent normal sub-pixel, having the same color as the defect sub-pixel, are electrically connected in the flat panel display panel, and wherein the third modulator modulates the first video data with pre-stored third compensation values and the third modulator modulates the second video data with a pre-stored fourth compensation value, wherein the third compensation values include an integer and a decimal fraction, which is determined according to a frame rate control method using dither patterns.