| CPC G02B 6/0016 (2013.01) [G02B 6/0068 (2013.01); G02F 1/133615 (2013.01); G02F 1/133609 (2013.01)] | 9 Claims |
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1. A planar illumination device, comprising:
a light guide plate configured to emit light incident from a light incident side surface from one principal surface of two principal surfaces; and
a plurality of light sources arranged in a longitudinal direction of the light incident side surface and configured to emit light incident on the light incident side surface,
wherein the light sources include a light emitting element configured to emit first light, and a wavelength conversion material configured to emit second light having a wavelength longer than a wavelength of the first light by the light emitted by the light emitting element, and the light incident side surface is formed with a plurality of rows of first optical elements extending in a width direction of the light guide plate and configured to diffuse incident light in a thickness direction of the light guide plate in a partial range in the thickness direction of the light guide plate, the range opposing the light emitting element, wherein
the number of rows of the first optical elements decreases from a center in the longitudinal direction of the light incident side surface toward an end part.
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