Patent ID: 7554512
Filing Date: 2009-06-30
Classification: G09G

Abstract:
1. An active matrix electroluminescent display device comprising an array of display pixels, each pixel comprising: an electroluminescent (EL) display element; a drive transistor for driving a current through the display element; a current sampling resistor, wherein the EL display element, the drive transistor and the current sampling resistor are in series between first and second power lines; circuitry comprising at least one sampling transistor for providing one or more feedback signals representing the voltage drop across the current sampling resistor to at least one feedback line, wherein the circuitry comprises a first sampling transistor connected between one terminal of the current sampling resistor and a first said feedback line; and an address transistor, connected between a data input line and the gate of the drive transistor, the gates of the address transistor and the or each sampling transistor being controlled by a shared address line, wherein the display device further comprises processing means for processing pixel drive signals in dependence on the feedback signal or signals.