摘要 |
The illumination system has a plurality of light sources (R, G, B), a light-transmissive light-sensing plate ( 5 ) and surface-modification structures ( 21, 22 ) provided at a limited number of pre-determined locations on a surface of the light-sensing plate ( 5 ). The surface-modification structures divert a portion of the light traveling through the light-sensing plate. The diverted light is guided towards an edge surface ( 15, 16 ) of the light-sensing plate, where at least one light sensor ( 11, 12 ) senses the diverted light. A first light sensor ( 11 ) preferably receives diverted light substantially exclusively from the first surface-modification structures ( 21 ), whereas the second light sensor ( 12 ) receives diverted light substantially exclusively from the second surface-modification structures ( 22 ). Alternatively, the illumination system further comprises a light-mixing chamber having a light-emission window for illuminating a display device, the light-sensing plate being arranged in the light-mixing chamber between the light source and the light-emission window.
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