Is a
Patent attributes
Patent Applicant
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Graham J Woodgate0
Jonathan Harrold0
Michael G Robinson0
Date of Patent
May 24, 2022
Patent Application Number
17387071
Date Filed
July 28, 2021
Patent Citations
...
Patent Citations Received
Patent Primary Examiner
A switchable backlight for a switchable privacy display apparatus comprises a collimated waveguide, first and second light sources and an optical turning film comprising elongate prismatic elements with facet orientations that pupillate the output of the waveguide in two orthogonal directions for each of first and second light sources. High luminance uniformity is achieved for a head-on user in privacy and public viewing modes and high uniformity of security factor is achieved for off-axis snoopers, with increased speed of privacy switch-on in privacy mode.
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