<P>PROBLEM TO BE SOLVED: To realize the expansion of a pixel gradation by controlling the charging time of a pixel capacitor, to massively increase the quantity of colors which can be displayed and to eliminate defects which can form lattice like stripe pattern in a vision when making use of human eye residual and vision inertia property. <P>SOLUTION: An expansion method for pixel gradation is provided which controls the first grade gradation voltage charging time by each gray scale, factionalizes its level and pluralizes the second grade gray scale whose charging times differ respectively but the gradation voltages are the same, therein the gradation voltage of the second grade by each gray scale is the same as the gradation voltage of the first grade gray scale corresponding to it, and the charging time corresponds to the second grade gray scale. By making use of this method, the first grade gray scale of the pixel which is displayed in the liquid crystal panel can be expanded and the display defects by the frame rate control method used in the conventional technology has been eliminated. <P>COPYRIGHT: (C)2009,JPO&INPIT 
PIXEL GRADATION EXPANSION METHOD, FOR PIXEL CAPACITOR CHARGING TIME DRIVING METHOD AND DEVICE