Passive light-based data communication
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United States of America Patent
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Jun 21, 2016
Grant Date -
Feb 18, 2016
app pub date -
Aug 14, 2014
filing date -
Aug 14, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
Techniques are disclosed for light-based communication using a passive light-reflective device having specially coded reflective or printed optics. The optics can be mounted to an object and configured to reflect light such that a receiver is able to receive the reflected light. The optics are further configured to alternatively display a number of different patterns that change as the receiver moves with respect to the optics, thus causing the receiver to receive an apparent stream of modulated light, which represents coded information that can be decoded into meaningful information. The optics can be mounted to a traffic control or other roadside device. As a vehicle approaches and passes the traffic control device, light reflects off of the optics in a series of patterns. This reflected light can be received by the vehicle and processed to relay the information to the operator or on-board vehicle system.
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