This paper discloses a new type of privacy display with selective privacy area. The display replaces
the conventional edge type LED backlight with direct type LED backlight. Each LED can be angle
adjustable individually. When operate in sharing mode, all LED are normal direction. When operate
in privacy mode, the system determines where is the selective privacy area and calculate the center
of the area. All LED under this area would rotate toward the center of the area.
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INC, HP, "SELECTIVE BLACK TYPE PRIVACY DISPLAY WITH ANGLE ADJUSTABLE MINI-LED", Technical Disclosure Commons, (March 19, 2019)