1. A method of compensating for structural non-uniformities in an array of solid state devices in a display panel, said method comprising displaying images in the panel, extracting the outputs of a pattern based on structural non-uniformities of the panel, across the panel, for each area of the structural non-uniformities, quantifying the non-uniformities based on the values of the extracted outputs, and modifying input signals to the display panel to compensate for the non-uniformities.