Patent ID: 7719492

Claim:
An active matrix electroluminescent display device comprising an array of display pixels, each pixel comprising: an electroluminescent (EL) display element ( 2 ); a drive transistor ( 22 ) for driving a current through the display element ( 2 ); an address transistor ( 16 ) for providing a pixel drive signal from a data line to the gate of the drive transistor ( 22 ); and a shorting transistor ( 30 ) connected between the gate and drain of the drive transistor, wherein the display device further comprises means ( 42 ) for measuring a voltage on the data line ( 6 ) after the shorting transistor ( 30 ) is turned on and discharges the voltage on the drive transistor ( 22 ) until the drive transistor( 22 ) switches off; and a single storage capacitor ( 24 ) is directly connected between a power supply line ( 26 ) and the gate of the drive transistor ( 22 ); and wherein the data input line ( 6 ) is switchable between a voltage driving mode in which it provides voltages to the pixels connected to the line and a floating mode in which the data line is placed in a high impedance state thereby allowing the data line to float to the voltage of the gate of the drive transistor of an addressed pixel.