Head-up display and method for operating it

The invention relates to a head-up display (1) comprising: - at least three light sources (2.1, 2.2, 2.3), each one arranged to emit light (L) with a basic colour different from the basic colour of the other light sources (2.1, 2.2, 2.3), - a digital micro mirror device (3) comprising an array of micro mirrors, wherein the light (L) of the light sources (2.1, 2.2, 2.3) is directed onto the digital micro mirror device (3), - at least one combiner (4) for displaying an image (I), and - at least one control unit (5) for multiplexing the light sources (2.1, 2.2, 2.3) so as to sequentially emit light (L) thus creating a field-sequential colour system and for controlling the digital micro mirror device (3) so as to selectively rotate the micro mirrors between an on state, where the light (L) from the light sources (2.1, 2.2, 2.3) is reflected into an optical path (OP) towards the combiner (4), and an off state, where the light (L) is reflected away from that optical path (OP). The invention also relates to a method for operating the head-up display (1).