Multi-primary display with spectrally adapted back-illumination

A system for displaying a color image comprising:

• an illumination source comprising a plurality of color light sources, each able to produce respective light of each of m different wavelength spectra, wherein m is equal to or greater than three, wherein each of said plurality of color light sources comprises one or more light emitting diodes;
• a converter to convert three-primary-color input data representing said color image into converted image data representing said color image in terms of n colors;
• an array of attenuating elements, each able to selectively attenuate the light produced by said plurality of color light sources of said illumination source according to an attenuation pattern corresponding to a gray-level representation of said converted image data;
• and
• an array of color sub-pixel filter elements able to receive selectively attenuated light from said array of attenuating elements, each sub-pixel filter element able to transmit light of one of n different non-white colors, wherein n is equal to or greater than four.