A cordless mouse with a transmission port for transmitting light signals downwardly into a mouse pad. The mouse pad includes a lower section and an upper section. The upper section is made of a LCD backlighting material which is arranged to direct the signals toward a light pipe on a side of the upper...http://www.google.com/patents/US6593911?utm_source=gb-gplus-sharePatent US6593911 - Infrared cordless mouse with mouse pad/receiver
