A method of providing drive transistor control signals to drive transistors in a plurality of electroluminescent subpixels in a display, comprising: (a) providing the display comprising a plurality of EL subpixels, each subpixel including a drive transistor having a first electrode, a second electrode and a gate electrode, an EL emitter having a first electrode and a second electrode, and a readout transistor having 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 and connecting the first electrode of each drive transistor to a first voltage source (PV DD) and the second electrode of each EL emitter to a second voltage source; (c) receiving for each subpixel an input code value which commands a corresponding output from the respective subpixel, (d) in each display frame, selecting a target subpixel; (e) providing to the gate electrode of the drive transistor of each subpixel, except the target subpixel, the respective input code value, and providing to the gate electrode of the drive transistor of 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, providing a selected test voltage to the gate electrode of the drive transistor of the target subpixel and simultaneously measuring a readout voltage on the second electrode of the readout transistor of the target subpixel to provide a status signal representing the characteristics of the drive transistor and EL emitter in the target 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 steps (d) through (h) in successive display frames, 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, characterized in that the selected delay time is a selected percentage of a time in which the display frame is displayed, wherein the selected first amount is a percentage of the output commanded by the corresponding input code value, and wherein the selected first amount is the reciprocal of the selected percentage, so as to prevent measurements in the target subpixel from being visible by equalizing the light output of the target subpixel and the other subpixels. (a) providing the display comprising a plurality of EL subpixels, each subpixel including a drive transistor having a first electrode, a second electrode and a gate electrode, an EL emitter having a first electrode and a second electrode, and a readout transistor having 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 and connecting the first electrode of each drive transistor to a first voltage source (PV DD) and the second electrode of each EL emitter to a second voltage source; (c) receiving for each subpixel an input code value which commands a corresponding output from the respective subpixel, (d) in each display frame, selecting a target subpixel; (e) providing to the gate electrode of the drive transistor of each subpixel, except the target subpixel, the respective input code value, and providing to the gate electrode of the drive transistor of 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, providing a selected test voltage to the gate electrode of the drive transistor of the target subpixel and simultaneously measuring a readout voltage on the second electrode of the readout transistor of the target subpixel to provide a status signal representing the characteristics of the drive transistor and EL emitter in the target 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 steps (d) through (h) in successive display frames, 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,