Planar light-emitting unit
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United States of America Patent
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Jan 16, 2018
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app pub date -
Mar 17, 2015
filing date -
Apr 21, 2014
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Abstract
A planar light-emitting unit includes a light emission region and a non-light emission region located in an outer periphery of the light emission region. A non-space region is provided between a light guide member and a diffusion member in a region corresponding to the non-light emission region such that a space is formed in a region corresponding to the light emission region between the light guide member and the diffusion member. The non-space region includes a protruding region extending to the light emission region from the non-light emission region, and a conditional expression 0<Δ≦2d×tan θ is fulfilled, where Δ is a protruding amount (mm) from the non-light emission region of the non-space region, d is a thickness (mm) of the light guide member, and θ is a total reflection critical angle between the light guide member and air.
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