Accessory for a laptop computer with LCD display which is connected to the laptop serial communications port and optically transmits data to a portable information device, such as a wristwatch designed to receive data as sequential pulses of light. The accessory includes a microcomputer with an...http://www.google.com/patents/US5835388?utm_source=gb-gplus-sharePatent US5835388 - Apparatus and method for optical transmission of serial data using a serial communications port 
