This invention is to produce true blacks by selectively turning off areas of the backlight behind
black areas in scenes by enhancing the aspect of LED LCD performance via local dimming on the
display screen that should be dark and keep bright the parts of the screen to be bright through
active magnet optical shutter, which can obtain high contrast ratio.
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INC, HP, "ACTIVE LOCAL DIMMING ON DISPLAY BY MAGNET OPTICAL SHUTTER", Technical Disclosure Commons, (January 30, 2020)