Patent ID: 7116058

Claim:
A method of improving the stability of an organic light emitting display device driven by an amorphous silicon thin film transistor, driving circuitry for driving the organic light-emitting display device including a driving transistor with a drain connected to a first power source, a source connected to an anode of an organic light emitting diode, a scan transistor having a gate connected to a scan line, a source connected to a data line and a drain connected to the gate of the driving transistor and one end of a storage capacitance, another end of the storage capacitance being connected to a resetting signal line, the method comprising the steps of: driving each sub-pixel in active matrix organic light emitting diode display devices; providing said driving circuitry for said driving; connecting a cathode of the organic light emitting diode to a comparatively fixed low potential; providing said scan transistor having a gate connected to scan line; connecting the other end of the storage capacitance to a resetting signal line, to provide a time pulse for resetting signal Vcom of high potential V 1 and low potential V 2 ; toggling the gate of the driving transistor to a negative voltage by the lower output voltage V 2 at the storage capacitance in accordance with the time pulse of the applied resetting signal Vcom, which temporarily prevents the organic light emitting diode from emitting light.