Patent 7893924 was granted and assigned to VKB on February, 2011 by the United States Patent and Trademark Office.
A data input device and method including an illuminator operative to illuminate at least one engagement plane by directing light along the at least one engagement plane, a two-dimensional imaging sensor viewing the at least one engagement plane from a location outside the at least one engagement plane for sensing light from the illuminator scattered by engagement of a data entry object with the at least one engagement plane and data entry processor receiving an output from the two-dimensional imaging sensor and providing a data entry input to utilization circuitry.