Patent Document ID: 9147362
Application ID: 13501113
Patent Status: 1

Claim One:
1. A method of dynamic gamut control for a display having a mum-spectrum backlight comprising a plurality of backlight sources with different spectra common for a plurality of pixels, pixels of the plurality of pixels being formed by a group of sub-pixels, each sub-pixel corresponding to a transmission component illuminated by the multi-spectrum backlight, the transmission components for each pixel having particular transmission spectrums to provide a set of color primaries, wherein at least a first transmission component of the transmission components has a transmission spectrum such that an intensity of at least one of the color primaries depends on an intensity of at least two of the plurality of light sources, the method comprising determining, for an image to be displayed, a set of backlight intensities for the plurality of light sources by performing a sequence of iterations, the image to be displayed comprising a plurality of colors corresponding to a set of color points in a color space, each iteration comprising the acts of: for each of the set of color points, determining a color point backlight intensity set by, for each backlight source of the plurality of backlight sources, determining a minimum backlight intensity allowing a color that corresponds to the color point to meet a representation criterion designating that the color point can be represented by the display when backlight intensities of backlight sources of the plurality of backlight sources other than the backlight source for which the minimum backlight intensity is determined are those of a set of backlight intensities determined in a previous iteration for the color point; and calculating the set of backlight intensities for the current iteration by selecting backlight intensities for each of the plurality of backlight sources from the color point backlight intensity sets such that a number of color points for which the color point backlight intensity set comprise a backlight intensity above a corresponding selected backlight intensity is below a threshold, wherein the determining act determines the color point backlight intensity for all the plurality of backlight sources in parallel during the current iteration using backlight intensities determined in the previous iteration, and wherein the calculating act calculates backlight intensity values for one backlight source of the plurality of backlight sources independent of calculations of backlight intensity values for other backlight sources of the plurality of backlight sources.