Patent ID: 7839367

Claim:
An active matrix display device comprising an array of display pixels, each pixel comprising: a current-driven light emitting display element ( 2 ); a drive transistor ( 22 ) for driving a current through the display element; a storage capacitor ( 24 ) for storing a voltage to be used for controlling the addressing of the drive transistor ( 22 ; 40 ); a light-dependent device ( 27 ) for controlling discharge of the storage capacitor ( 24 ), thereby to alter the control of the drive transistor in dependence on the light output of the display element; and a circuit ( 60 ) associated with the drive transistor for increasing the rate of discharge of the storage capacitor ( 24 ) when the storage capacitor is discharged in response to the light dependent device ( 27 ) output, wherein the circuit associated with the drive transistor comprises a clocked inverter circuit ( 36 , 140 ), the output of the inverter circuit controlling the drive transistor.