Patent ID: 8624803

Claim:
An active matrix electroluminescent display device comprising an array of display pixels, each pixel comprising: an electroluminescent display element; an amorphous silicon or microcrystalline silicon first drive NMOS transistor having a source directly connected to the anode of the display element and having a drain connected to a power supply line; a storage capacitor between the anode of the display element and a gate of the first drive transistor; and an amorphous silicon or microcrystalline silicon second drive NMOS transistor having a source directly connected to the anode of the display element and having a drain directly connected to a holding voltage for supplying the holding voltage, minus a drain to source voltage drop across the second drive transistor, to the anode of the display element, wherein when the holding voltage is supplied to the anode of the display element, a gate-source voltage, for the first drive transistor, is stored on the storage capacitor.