Patent ID: 7737925

Claim:
A pixel cell in an active matrix display comprising: a current driven emissive element, a data input for receiving an analog data signal (V in ), at least two drive elements, each being connected to a power supply and arranged to drive the emissive element in accordance with said analog data signal (V in ), selecting means for selecting one or more of the at least two drive elements in response to one or more select signals, and for providing said data signal (V in ) to the selected one or more drive elements, wherein each drive element is adapted to drive the emissive element in a different drive current range in response to a given voltage of the analog data signal (V in ), wherein when the analog data signal having a first voltage is provided to a first one of the drive elements for a duration of time and said first drive element is selected to drive the emissive element, a brightness of the emissive element is greater than when the analog data signal having the first voltage is provided to a second one of the drive elements for the duration of time and said second drive element is selected to drive the emissive element, and wherein the analog data signal has a desired voltage range to provide a desired brightness range, and wherein a separation between a lower value of the desired voltage range and threshold voltages of the at least two drive elements is increased by mapping the desired voltage range onto a smaller voltage range for providing the desired brightness range.