Patent ID: 8847859

Claim:
A display device comprising an active matrix array of pixel elements comprising current-addressed light emitting display elements arranged in rows and columns and associated driver circuitry, said device comprising; compensation circuitry for modifying target pixel drive currents to take account of a voltage at each of said pixel elements and a dependency of a brightness characteristic associated with a corresponding pixel, the compensation circuitry comprising: means for applying an algorithm to the target pixel drive currents; and means for scaling the target drive currents by applying a value on the voltage on a conductor associated with a row containing the corresponding pixel element, said value being determined based on the dependency of the brightness characteristic of the corresponding pixel element, on characteristics of the driver circuitry associated with the pixel element and a ratio between a current drawn in a programming phase and a current drawn in a driving phase of the corresponding pixel element, wherein said ratio is dependent upon a display type.