A method for displaying images at a viewing area, the method comprising the steps of: providing an array comprising a plurality of groups (16R, 16B, 16G) of individually-controllable light sources, the light sources of each group (16R, 16B, 16G) emitting light of a corresponding one of a plurality of colors; providing a modulator having an active area comprising a plurality of pixels; and providing a control circuit configured for generating light source control signals for driving the light sources to project light onto the active area of the modulator, and modulator control signals for controlling the pixels of the modulator to vary a proportion of light incident on the active area that is passed to the viewing area, wherein the array is operable to project a luminance pattern which has a variation in intensity over the active area for each of the plurality of colors; and in that the control circuit is further configured for: - ranking the plurality of colors in order of importance wherein a first color is determined to be more important than other ones of the plurality of colors; - establishing a first effective luminance pattern for a first one of the groups (16R, 16B, 16G) of light sources in the array corresponding to the first color, the first effective luminance pattern indicating variations in intensity of the light of the first color over the active area and being such that a luminance specified for each pixel, for the first color, by image data can be achieved within the range of modulation of the pixel; characterized in that the method further comprises the steps of: - determining first modulator values by dividing a desired luminance for each pixel as specified in the image data for the first color by the luminance for that pixel provided by the first effective luminance pattern; - establishing a second effective luminance pattern for a second one of the groups (16R, 16B, 16G) of light sources in the array corresponding to a second color, the second effective luminance pattern indicating variations in intensity of the light of the second color over the active area and being obtained by dividing the values specified in the image data for the second color by the first modulator values; - and applying said control signals (17, 18) for driving the first group (16R, 16B, 16G) of light sources with a first light-source-driving signal such that the first group (16R, 16B, 16G) of light sources projects the first effective luminance pattern onto the active area of the modulator, for driving the second group (16R, 16B, 16G) of light sources with a second light-source-driving signal such that the second group (16R, 16B, 16G) of light sources projects the second effective luminance pattern onto the active area of the modulator, and for controlling the pixels of the modulator to selectively allow light of the first color and the second color from the active area to pass to the viewing area based on the first modulator values. providing an array comprising a plurality of groups (16R, 16B, 16G) of individually-controllable light sources, the light sources of each group (16R, 16B, 16G) emitting light of a corresponding one of a plurality of colors; providing a modulator having an active area comprising a plurality of pixels; and providing a control circuit configured for generating light source control signals for driving the light sources to project light onto the active area of the modulator, and modulator control signals for controlling the pixels of the modulator to vary a proportion of light incident on the active area that is passed to the viewing area, - ranking the plurality of colors in order of importance wherein a first color is determined to be more important than other ones of the plurality of colors; - establishing a first effective luminance pattern for a first one of the groups (16R, 16B, 16G) of light sources in the array corresponding to the first color, the first effective luminance pattern indicating variations in intensity of the light of the first color over the active area and being such that a luminance specified for each pixel, for the first color, by image data can be achieved within the range of modulation of the pixel; - determining first modulator values by dividing a desired luminance for each pixel as specified in the image data for the first color by the luminance for that pixel provided by the first effective luminance pattern; - establishing a second effective luminance pattern for a second one of the groups (16R, 16B, 16G) of light sources in the array corresponding to a second color, the second effective luminance pattern indicating variations in intensity of the light of the second color over the active area and being obtained by dividing the values specified in the image data for the second color by the first modulator values; - and applying said control signals (17, 18) for driving the first group (16R, 16B, 16G) of light sources with a first light-source-driving signal such that the first group (16R, 16B, 16G) of light sources projects the first effective luminance pattern onto the active area of the modulator, for driving the second group (16R, 16B, 16G) of light sources with a second light-source-driving signal such that the second group (16R, 16B, 16G) of light sources projects the second effective luminance pattern onto the active area of the modulator, and for controlling the pixels of the modulator to selectively allow light of the first color and the second color from the active area to pass to the viewing area based on the first modulator values.