Light guide plate with subwavelength grating and backlight module using the same
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United States of America Patent
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Jul 3, 2007
Grant Date -
Aug 25, 2005
app pub date -
Dec 23, 2004
filing date -
Feb 19, 2004
priority date (Note) -
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Abstract
A light guide plate (30) has a light incident surface (305) for receiving light, a light emitting surface (301) for emitting light, a bottom surface (303) opposite to the light emitting surface, and side surfaces (307, 309, 311). A subwavelength grating (302) is formed on the light incident surface for diffracting the light. The subwavelength grating is a zeroth-order grating which covers a wide wavelength band and diffracts the light into zeroth-order waves. So that the light guide plate has a high light utilization efficiency and yields high uniformity of outgoing light.
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