Edge light-type backlight device and light diffusion member
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United States of America Patent
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Jun 14, 2016
Grant Date -
Jan 29, 2015
app pub date -
Mar 26, 2013
filing date -
Mar 30, 2012
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Abstract
This edge light-type backlight device comprises a light guide plate, a light source disposed at one end part of the light guide plate, a light diffusion sheet and a prism sheet on a light emission face of the light guide plate. The refractive index of the prism sheet exceeds 1.60, a peak of emitted light distribution of the light emission face in a plane parallel to the one end part of the light guide plate and orthogonal to the light emission face is within an angle ranges of 30°˜45° and −30°˜−45° with respect to a normal direction of the light emission face. The emitted light of the light emission face diminishes toward an emission angle −90° or 90° with respect to the normal line from the angle ranges of the peak of the emitted light distribution. High frontal brightness and diffusion are realized.
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