Is a
Patent attributes
Patent Applicant
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Michael G Robinson0
Graham J Woodgate0
Jonathan Harrold0
Date of Patent
April 11, 2023
0Patent Application Number
173870560
Date Filed
July 28, 2021
0Patent Citations
...
Patent Primary Examiner
A switchable backlight for a switchable privacy display apparatus comprises a collimated waveguide and an optical turning film comprising first and second arrays of elongate prismatic elements. High image luminance and image visibility is provided for off-axis viewers in a public mode of operation while in a privacy mode of operation visual security level above a perceived privacy threshold may be achieved for off-axis snoopers.
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