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US 12,595,893 B2Granted
Planar illumination device
AssigneeMINEBEA MITUSMI Inc.
InventorsGinga Ito, Masaya Fujiwara
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AssigneeMINEBEA MITUSMI Inc.
InventorsGinga Ito, Masaya Fujiwara
Estimating the term…
A planar illumination device according to an embodiment includes a substrate, a first optical element, a second optical element, a third optical element, a pair of fourth and fifth optical elements, and a sixth optical element. A plurality of light sources are two-dimensionally arranged on the substrate. The first optical element is arranged at an emission side of the plurality of light sources to condense light emitted from the plurality of light sources. The second optical element is arranged at an emission side of the first optical element to tilt light distribution of the light condensed by the first optical element in a first axial direction within an emission surface. The third optical element is arranged at an emission side of the second optical element to spread the light tilted by the second optical element in the first axial direction. The pair of fourth and fifth optical elements are arranged at the emission side of the plurality of light sources to spread light in a second axial direction orthogonal to the first axial direction within an emission surface. The sixth optical element is formed by combining the second optical element and the third optical element to substitute for the second optical element and the third optical element.
A planar illumination device comprising:
A planar illumination device comprising:
A planar illumination device comprising:
Dependencies are inferred from the claim text.