Light guide plate for surface light source device and backlight unit using the same
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United States of America Patent
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Dec 31, 2013
Grant Date -
May 31, 2012
app pub date -
Sep 15, 2011
filing date -
Nov 29, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A light guide plate for a surface light source device is provided, which includes an incident surface configured to have light from lamps disposed along a predetermined axis, be incident thereon, an emitting surface configured to have the incident light emitted therefrom, a back surface configured to face the emitting surface, and a plurality of unit cells configured to have microprism patterns engraved thereon and distributed and arranged on the back surface. A crossing angle of a microprism arrangement axis, formed by a ridge direction of the microprism patterns, and of an arrangement axis of the lamps is disposed in an alternate angle. The light guide plate has a high front brightness and an excellent uniformity in brightness and does not have a moire phenomenon. In a backlight unit, the use of optical sheets stacked on the light guide plate can be reduced.
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