Patent ID: 8358256

Claim:
A method of providing drive transistor control signals to drive transistors in a plurality of electroluminescent (EL) subpixels, the method comprising: (a) providing a plurality of EL subpixels, each subpixel comprising: a drive transistor comprising a first electrode, a second electrode, and a gate electrode; an EL emitter comprising a first electrode and a second electrode; and readout transistor comprising a first electrode, a second electrode, and a gate electrode; (b) connecting the first electrode of each readout transistor to the second electrode of the corresponding drive transistor and to the first electrode of the corresponding EL emitter; (c) receiving for each subpixel an input code value which commands a corresponding output from the respective subpixel; (d) selecting a target subpixel; (e) providing to each subpixel, except the target subpixel, the respective input code value, and providing to the target subpixel a boosted code value which commands a selected first amount higher output than the corresponding input code value; (f) after a selected delay time, measuring a readout voltage on the second electrode of the readout transistor of the target subpixel to provide a status signal representing characteristics of the drive transistor and EL emitter in that subpixel; (g) using the status signal to provide a compensated code value for the target subpixel; (h) providing a drive transistor control signal corresponding to the compensated code value to the drive transistor of the target EL subpixel; and (i) repeating operations (d) through (h), selecting each of the plurality of subpixels in turn as the target subpixel, to provide a respective drive transistor control signal to the drive transistor in each of the plurality of EL subpixels, wherein the selected delay time comprises a selected percentage of a selected frame time, wherein the selected first amount comprises a percentage of the output commanded by the corresponding input code value, and wherein the selected first amount comprises the reciprocal of the selected percentage.