Patent ID: 7864172
Filing Date: 2011-01-04
Classification: G09G

Abstract:
1. A cathode potential controller for controlling a common cathode potential applied to a self light emission type display panel in which an emission state of each of pixels is driven and controlled in accordance with an active matrix drive system, said cathode potential controller comprising: a self light emitting element for voltage measurement disposed outside an effective display region; a constant current source for supplying a constant current to said self light emitting element for voltage measurement; an electrode-to-electrode voltage measuring portion measuring a potential developed at an anode electrode of said self light emitting element for voltage measurement, and measuring an electrode to electrode voltage of said self light emitting element for voltage measurement; a cathode potential determining portion determining a cathode potential value by using a difference value between a measured value of the electrode to electrode voltage of said self light emitting element for voltage measurement, and a reference voltage value as a correction value; and a cathode potential applying portion applying a cathode potential corresponding to the determined cathode potential value to a common cathode electrode of said self light emission type display panel.