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1. (WO2018182917) DIRECTIONAL BACKLIGHT, BACKLIT DISPLAY AND METHOD

Pub. No.:    WO/2018/182917    International Application No.:    PCT/US2018/020544
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Fri Mar 02 00:59:59 CET 2018
IPC: F21V 8/00
G02B 27/42
Applicants: LEIA INC.
Inventors: FATTAL, David A.
Title: DIRECTIONAL BACKLIGHT, BACKLIT DISPLAY AND METHOD
Abstract:
A directional backlight, backlit display and method of directional backlight operation employ diffraction grating to provide emitted light collectively scattered out by diffraction gratings having a uniform intensity and angular spread. The directional backlight includes a light guide configured to guide plurality of guided light beams and a light source configured to provide the guided light beam plurality having the different radial directions. The directional backlight further includes an array of diffraction gratings configured to configured to scatter out a portion of a guided light beam of the guided light beam plurality as emitted light having an intensity and an angular spread that is uniform across the light guide surface. The backlit display further includes an array of light valves configured to modulate the emitted light to provide a displayed image.