Dual light guide grating-based backlight and electronic display using same
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United States of America Patent
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Sep 29, 2020
Grant Date -
Jan 25, 2018
app pub date -
Oct 3, 2017
filing date -
Apr 23, 2015
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Abstract
Dual light guide, grating-based backlighting redirects light guided in a first light guide in a first direction into a second light guide in a second direction of a grating-based backlight. A dual light guide, grating-based backlight includes the first light guide, the second light guide and a redirection coupler configured to redirect the guided light beam from the first light guide into the second light guide in the second direction. The dual light guide, grating-based backlight further includes a diffraction grating configured to diffractively couple out a portion of the redirected light beam from the second light guide as a coupled-out light beam directed away from a surface of the second light guide at a predetermined principal angular direction.
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