Unidirectional grating-based backlighting employing a reflective island
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United States of America Patent
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Mar 16, 2021
Grant Date -
Oct 26, 2017
app pub date -
Jul 11, 2017
filing date -
Jan 19, 2015
priority date (Note) -
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Abstract
Unidirectional grating-based backlighting includes a light guide and a diffraction grating at a surface of the light guide. The light guide is to guide a light beam and the diffraction grating is configured to couple out a portion of the guided light beam using diffractive coupling and to direct the coupled-out portion away from the light guide surface as a primary light beam at a principal angular direction. The unidirectional grating-based backlighting further includes a reflective island in the light guide between the light guide surface and an opposite surface of the light guide to reflectively redirect a diffractively produced, secondary light beam out of the light guide in a direction of the primary light beam.
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