Devices and methods for enhancing brightness of displays using angle conversion layers
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United States of America Patent
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Oct 18, 2011
Grant Date -
Aug 13, 2009
app pub date -
Feb 11, 2009
filing date -
Feb 12, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Various embodiments of the present invention relate to enhancing the brightness of displays that employ illumination systems. In some embodiments, the illumination systems include light guides, diffractive microstructure, and light-turning features. The diffractive microstructure may be configured to receive ambient light at a first angle and produce diffracted light at a second angle greater than the first angle and greater than the critical angle for of light guide. The light is thereby guided within the light guide. The light-turning features may be configured to turn the light guided within the light guide out of a light guide and onto, for example, a spatial light modulator at near normal incidence.
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