Method for transforming three colors input signals to four or more output signals for a color display

Abstract

A method for transforming three color input signals (R, G, B) corresponding to three gamut defining color primaries to four color output signals (R', G′, B′, W) corresponding to the gamut defining color primaries and one additional color primary W for driving a display having emitters that emit light corresponding to the to the four color output signals including calculating a common signal value S as a function Fof the three color input signals (R,G,B) for a current and neighboring pixels; determining a final common signal value S′ based upon the common signals for the current and neighboring pixels; calculating the three color signals (R′,G′,B′) by calculating a value of a function Fof the final common signal value S′ and adding it to each of the three color input signals (R,G,B); and calculating the output signal W as a function Fof the final common signal value S′.