Abstract: A scrolling color projection system, comprising a pulsed lamp (4) and a color scanner (6, 8a, 8b, 8c, 9) for generating a light beam (5b) with a plurality of scrolling color fields, arranged to illuminate a display device (1, 3) to produce a projection of an image generated by the display device, wherein the frequency of the lamp is controlled so as to be related to the frame rate of the display device. By controlling the lamp frequency in relation to the frame rate, a generated interference pattern can be controlled to be distributed over several frame periods and over the entire height of the display. In particular, the pattern can be controlled in such a way that it is not perceptible to the human eye.

Abstract: The invention relates to a device for generating an image for projection, the device comprising a light source, a light source drive unit, electro-optical light modulation means including color scanning means for simultaneously generating scrolling image parts of different colors, image projection means for projecting the image by using said scrolling image parts and a projection drive unit for controlling said image projection means by a control signal including the image data to be projected. In such devices, a UHP lamp is often used as a light source. Therein, a pulse on the lamp current is used to shape the electrodes in such a way that the lamp arc remains in a stable position.