It appears to be a consumer application of the Tektronix Liquid Crystal Color Shutter (LCCS), introduced in the early 90s:
http://www.electronicproducts.com/Te...bandwagon.aspx
1986 patent: http://www.google.com/patents/US4582396
jr
Last edited by jr_tech; 10-26-2014 at 10:24 PM.
Reason: add patent link
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