LIGHT VALVE PROJECTOR FOR REPRODUCING COLOUR TELEVISION SIGNALS

摘要

For the large-screen projection of colour television pictures, picture reproducing arrangements comprising three separate picture tubes are in most cases used which are followed by projection optics. The colour television picture is created on a projection screen by superimposing the three monochrome television pictures. Instead of picture tubes, light valves can also be used, particularly liquid- crystal light valves with illumination optics. To increase the luminance resolution of a light valve projector, a geometric offset arrangement, preferably by half a picture element width in the horizontal and vertical picture direction of the light valves is provided. New picture scanning values are calculated by a signal processing circuit arranged in the light valve projector, in such a manner that the position of the picture scanning values and the position of the picture elements of the picture scanning values and the position of the picture elements of the light valves correspond to one another. The light valve projector is particularly suitable for reproducing high-resolution colour television pictures.