ILLUMINATION DEVICE WITH A FILTERING DEVICE

摘要

An illumination device having a filtering device is configured such that the filtering device comprises an optically addressable spatial light modulator with a filtering aperture which is generated by addressing. The position of the filtering aperture within the Fourier plane and/or the size of the filtering aperture is controlled by the control unit. The light modulator is addressed such that the position of the filtering aperture in the Fourier plane corresponds with the position of the intermediate image of the activated light source. At the same time the position of the imaged intermediate image corresponds with the detected position in the observer plane, and the size of the filtering aperture is determined by maximal one diffraction order of the light which is diffracted by the electrically addressable spatial light modulator. The field of application of this invention includes holographic projection displays.