Patent ID: 7492360

Claim:
An image display device comprising a plurality of gate buses, a plurality of source buses, transistors each of which for supplying a pixel electrode with a voltage from said source bus, a common electrode, and a corrected voltage supplying means for supplying said common electrode with a common electrode voltage which has been corrected by an amount of correction, wherein said corrected voltage supplying means comprising: a changing voltage generating means for generating a first changing voltage having changing voltage levels for setting said transistor to an on-state and a second changing voltage having changing voltage levels for setting said transistor to an off-state, said changing voltage generating means operating so as to establish at least three supply modes including a first supply mode, a second supply mode and a third supply mode, said first supply mode in which said first changing voltage is supplied to a first number of ones of said plurality of gate buses and said second changing voltage is supplied to a second number of ones of said plurality of gate buses, said second supply mode in which said first changing voltage is supplied to a third number of ones of said plurality of gate buses and said second changing voltage is supplied to a fourth number of ones of said plurality of gate buses or said first changing voltage is supplied to at least said third number of ones of said plurality of gate buses and said second changing voltage is not supplied to said plurality of gate buses, and said third supply mode in which said first changing voltage is supplied to a fifth number of ones of said plurality of gate buses and said second changing voltage is supplied to a sixth number of ones of said plurality of gate buses or said first changing voltage is not supplied to said plurality of gate buses and said second changing voltage is supplied to at least said sixth number of ones of said plurality of gate buses; and a corrected voltage generating means for detecting, each time each of said at least three modes is established, a voltage on said common electrode to determine said amount of correction on the basis of amounts of change in said detected voltages on said common electrode; wherein said at least three supply modes consists of only said first, second and third supply modes, wherein said second supply mode is a mode in which said first changing voltage is supplied to all of said plurality of gate buses, and wherein said third supply mode is a mode in which said second changing voltage is supplied to all of said plurality of gate buses.