A transceiver for transmitting and receiving coded light through a motor vehicle windshield from an in-vehicle computer. The coded light is binary encoded data that is first transmitted through the windshield by light emitting diodes in the red, green, or yellow light range or a similar light range that...http://www.google.se/patents/US5552780?utm_source=gb-gplus-sharePatent US5552780 - Method and apparatus for transmitting coded light through low transmissible materials
