BRIGHTNESS AND COLOUR CONTROL OF A PROJECTION APPLIANCE

摘要

In order to control the brightness and/or the color of a projection apparatus ( 1 ), more particularly of a rear projection apparatus of a projection wall, wherein the image generation is based on time-sequential mixing of primary colors, it is proposed that a semi-transparent mirror ( 14 ) is used to couple out a portion of the light supplied to the imaging device ( 11 ), that a sensor ( 15 ) is used to measure said light portion and that the image generation is controlled with the signal thus obtained.