Patent ID: 8681185
Filing Date: 2014-03-25
Classification: G09G

Abstract:
1. A method of displaying an image having M by N pixels, comprising; selecting each of a plurality of macro-pixel groupings collectively forming the M by N pixel display; generating patterns corresponding to on-off switch states of Walsh transform type orthogonal basis functions for each macro-pixel; determining image coefficients for respective patterns; for image coefficients which are negative, reversing the pattern from blocking to passing state (‘0’ to ‘1’) and vice versa by inverting the pattern for the respective orthogonal basis functions and using the absolute value for the respective image coefficient in the following correction of the zero image coefficient; cancelling the averaging artifact which arises from using patterns corresponding to non-orthogonal basis functions which multiply by 0 or +1 instead of −1 or +1 by correcting the zero image coefficient applicable to the entire macro-pixel by subtracting one half of the sum of the image coefficients applicable to all patterns before controlling pixel illumination; controlling the pixel illumination within a macro-pixel using patterns responsive to an image coefficient for the respective pattern using the corrected zero image coefficient.