Patent ID: 6104363
Filing Date: 2000-08-15
Classification: G09G

Abstract:
A method for driving a display element comprising organic light-emitting elements for emitting light by currents applied to the light-emitting elements, wherein a voltage VC is applied to cathodes of the organic light-emitting elements and a voltage VA is applied to anodes of the organic light-emitting elements through anode and cathode lines crossing each other, and wherein a display of a pixel at an intersection of the anode and cathode lines is controlled by electric signals through the two lines,said method comprising, applying voltages through said anode and cathode lines to the pixels to have following conditions: ##EQU3## V(t): Voltage applied to the pixel, t (Aon, Con): Period of time during which the pixel emits light,t (Aoff, Con): Period of time during which a light-emitting pixel is included on the cathode line of the pixel,t (Aon, Coff): Period of time during which the light-emitting pixel is included on the anode line of the pixel,t (Aoff, Coff): Period of time during which the light-emitting pixel is not included on the anode or cathode line of the pixel,V1: Voltage for obtaining required brightness of the pixel of the display element (V1>0),V2: Minimum value of recovery voltage of the pixel of the display element (V2>0),V3: Light-emitting threshold voltage of the pixel of the display element (V3>0),V4: Maximum value of the recovery voltage of the pixel of the display element (V4>0),wherein the recovery voltage is applied to the pixel during a non-lighting period of time between lighting periods of time of the pixel of the display element, which meets at least following condition (5), ##EQU4## t.sub.0 : Certain point of time after the pixel has been extinguished, L: Thickness of the organic layer of the organic light-emitting element,.mu..sub.max : Maximum value of carrier mobility of the organic layer,T: Certain point of time before the pixel is lit again,V(t): Voltage waveform applied to the element.