Optical waveguide sheet, backlight unit, and portable terminal
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United States of America Patent
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Mar 7, 2017
Grant Date -
Aug 20, 2015
app pub date -
Feb 19, 2015
filing date -
Feb 19, 2014
priority date (Note) -
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Abstract
An optical waveguide sheet for use in an edge-lit backlight unit is provided, that allows rays of light to enter the end face and emits the rays of light from the front face substantially uniformly. The optical waveguide sheet includes on the back side thereof: a sticking preventive means; and a plurality of recessed portions falling toward the front face side. The sticking preventive means: a plurality of annular raised portions each provided around each of the plurality of recessed portions and projecting toward the back face side; and a plurality of protruding portions provided scatteredly in a region which does not include the annular raised portions. The optical waveguide sheet is preferably for use as a light guide film having an average thickness of no less than 100 μm and no greater than 600 μm.
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