Uniform diffractive backlight
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United States of America Patent
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Mar 6, 2012
Grant Date -
Mar 3, 2011
app pub date -
Aug 25, 2009
filing date -
Aug 25, 2009
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A backlight is provided for illuminating an at least partially transmissive display. The backlight includes a light source. A light guide receives the light from an edge surface and guides the light by total internal reflection. The light is extracted from the lightguide using sub-wavelength extraction features designed on the basis of one grating structure with a second interlinks structure cut into the first structure. The first structure determines the extraction properties. The second structure determines the extraction efficiency and uniformity of the system. Higher efficiency and more uniform sub-wavelength extraction are possible with a device in accordance with the invention.
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