Method of and unit for displaying an image in sub-fields

An image processing unit (300) for processing an image to be displayed on a display device (406) in a plurality of periods called sub-fields, wherein the display device is capable of generating in each of the sub-fields a respective illumination level, the image display unit (300) comprising:

• storage means (304) for storing a set of combinations of sub-fields, each element of the set corresponding to a respective available illumination level,
• selection means (310) for selecting from the set a particular combination of sub-fields in conformity with the intensity value of a particular pixel of the image, and
• sending means (312) for sending a representation of the selected combination of sub-fields to the display device (406) in order to display the particular pixel,
• characterized in that in the set a difference regarding sub-fields between a first one of the combinations representing a first available illumination level and a second one of the combinations representing the next higher illumination level in the set has been limited, the limiting including control such that only a limited number of the sub-fields that are switched on in the first one of the combinations is not switched on in the second one of the combinations.