An imaging module in one embodiment includes at least one multiple color emitting light source comprising a plurality of different colored LED dies each independently driveable so that the overall color emitted by the light source can be controlled and varied. The multiple color emitting light source...http://www.google.com.hk/patents/US6832725?utm_source=gb-gplus-share專利 US6832725 - Optical reader comprising multiple color illumination
