EDGE LIGHT-TYPE BACKLIGHT DEVICE AND LIGHT DIFFUSION MEMBER
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United States of America Patent
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Feb 26, 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 a light emission face of the light diffusion sheet in a plane orthogonal to a direction along the one end part of the light guide plate is within an angle range of 48°-58° with respect to a normal direction of the light emission face, and the emitted light of the light emission face of the light diffusion sheet diminishes toward −90° or 90° with respect to the normal line from the angle range of the peak of the emitted light distribution. High frontal brightness and diffusion are realized.
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