A method for the correction of average luminance or luminance uniformity variations in an active-matrix OLED display, comprising: a) providing an active-matrix OLED display; b) determining at a first time a first offset voltage and a first gain relationship between the voltage and the current passing through one or more light-emitting elements; c) receiving a signal for driving the light-emitting elements after step b), correcting the signal by employing the first offset voltage and gain relationship values to compute a linear correction for the light-emitting elements to form a corrected signal, and driving the display with the corrected signal; d) determining at a time after the first time an updated offset voltage and an updated gain relationship between the voltage and the current passing through the light-emitting elements; and e) receiving a signal for driving the one or more light-emitting elements after step d), correcting the signal by employing the updated offset voltage and gain relationship values to compute a linear correction for the light-emitting elements to form an updated corrected signal, and driving the display with the updated corrected signal.