Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen Mbh

Andre Philipp

Alois Biebl

Ludwig Plötz

A description is given of an illumination device which emits mixed-color light containing light of at least two different color channels (R, RG, GB, B). The illumination device contains at least one primary light source () of a first color, the light of which forms a first color channel (R, RG, GB, B), and at least one primary light source () of a second color, the light of which forms a second color channel (R, RG, GB, B), at least one sensor device (), which is positioned such that it can receive mixed-color light and is suitable for detecting brightness of light of a wavelength range comprising the color channels (R, RG, GB, B) and which determines the brightnesses of the different color channels (R, RG, GB, B) separately and repeatedly during operation. Furthermore, the illumination device contains an evaluation and control device (), which evaluates the brightness values of the color channels (R, RG, GB, B) and determines pulse-width-modulated electrical signals with a basic period () modified in such a way for the driving of the individual color channels (R, RG, GB, B) in such a way that the color location of the mixed-color light lies within a predetermined region of the CIE standard chromaticity diagram. A method is also described for controlling such an illumination device.

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Marbach, Germany

Andre Philipp