Abstract: A display for generating changing or still images is shown and described. The display includes a plurality of display light emitting diodes (LEDs), each display LED generating light at an intensity related to current applied thereto. The display further includes a circuit which controls the current applied to each display LED to generate at least a portion of an image on the display, wherein the current is changed to change the portion of the image. The display yet further includes at least one reference LED coupled to the circuit, wherein the circuit applies a current to the reference LED dependent upon the current applied to at least one display LED, the circuit periodically applying a reference current to the reference LED.