Patent ID: 7474283

Claim:
An active matrix electroluminescent display device comprising an array of display pixels ( 10 ), each pixel comprising: an electroluminescent display element ( 20 ); a drive transistor ( 22 ) for driving a current through the display element; a storage capacitor ( 24 ) for storing a voltage to be used for addressing the drive transistor; gated photosensitive means ( 36 ) coupled to the storage capacitor ( 24 ) for discharging the storage capacitor in dependence on the light output of the display element; and an inverter ( 50 ) whose output ( 51 ) is coupled to the gate of the gated photosensitive means ( 36 ) and whose input ( 52 ) is coupled to one side of the storage capacitor ( 24 ), the inverter being operable to turn on the gated photosensitive means rapidly to discharge the storage capacitor upon the voltage at the one side of the storage capacitor reaching a predetermined level.