Patent ID: 7619593
Filing Date: 2009-11-17
Classification: G09G

Abstract:
1. An active matrix display device comprising an array of display pixels, each pixel comprising: a current driven light emitting display element and a first drive transistor for driving a current through the display element, the display element and the first drive transistor being in series between power supply lines; a first storage capacitor for storing a gate-source voltage of the first drive transistor; a second drive transistor, operable only during pixel programming, for providing a drive current based on an input I voltage provided to a gate of the second drive transistor; and a second storage capacitor for storing the input voltage for driving the second drive transistor, wherein the second storage capacitor is connected between the gate and a drain of the second drive transistor; wherein the drive current provided by the second drive transistor passes through the first drive transistor, a voltage thereby being generated on the first storage capacitor corresponding to the drive current.