A system for the correction of brightness and uniformity variations in OLED displays is described, comprising: a) an OLED display including a plurality of light-emitting elements; b) a non-volatile memory having uniformity correction information for the OLED display stored therein and permanently associated with and physically attached to the OLED display; and c) a controller connected to the OLED display and to the non-volatile memory for reading the information from the non-volatile memory, receiving an input signal, correcting the input signal using the information to form a corrected input signal, and transmitting the corrected input signal to the OLED display. Also described are OLED display device units comprising an OLED display and a permanently associated non-volatile memory, and a method for the correction of brightness and uniformity variations in OLED displays.