Is a
Patent attributes
Patent Applicant
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Michael G. Robinson0
Graham J. Woodgate0
Jonathan Harrold0
Robert A. Ramsey0
Date of Patent
May 25, 2021
0Patent Application Number
162260390
Date Filed
December 19, 2018
0Patent Citations
Patent Citations Received
Patent Primary Examiner
Patent abstract
A privacy display comprises a spatial light modulator and a compensated switchable liquid crystal retarder arranged between first and second polarisers arranged in series with the spatial light modulator. In a privacy mode of operation, on-axis light from the spatial light modulator is directed without loss, whereas off-axis light has reduced luminance. The visibility of the display to off-axis snoopers is reduced by means of luminance reduction over a wide polar field. In a wide angle mode of operation, the switchable liquid crystal retardance is adjusted so that off-axis luminance is substantially unmodified.
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