Patent ID: 8228348

Claim:
A method for correcting non-conformance in greyscale or colour values of a plurality of zones of pixel elements in a matrix display, the correcting being with respect to an enforced greyscale or colour display standard, each zone of pixel elements being corrected by a different calibration function, the method comprising, for each zone of pixel elements independently, storing characterisation data characterising the non-conformance in greyscale or colour values of the zone of pixel elements as a function of its drive signals, the drive signals corresponding to a number of greyscale or colour levels, pre-correcting, in accordance with the characterisation data, the drive signals of said zone of pixel elements so as to obtain a greyscale or colour level conforming to said enforced greyscale or colour display standard, said pre-correcting being performed based on an input value of the greyscale or colour value to be displayed and the viewing angle under which the zone of pixel elements is or is to be viewed at, reducing the number of greyscale or colour levels by adjusting the drive signals, if the viewing angle under which the zone of pixel elements is or is to be viewed at, is outside a pre-determined range.