Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Graham J. Woodgate0
Michael G. Robinson0
Jonathan Harrold0
Date of Patent
June 18, 2024
0Patent Application Number
182167880
Date Filed
June 30, 2023
0Patent Citations
...
Patent Primary Examiner
Patent abstract
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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