US 12,169,299 B2
Planar light source
Seitaro Akagawa, Komatsushima (JP); Takuya Nakabayashi, Tokushima (JP); Masato Okuda, Itano-gun (JP); and Yasunori Shinomiya, Tokushima (JP)
Assigned to NICHIA CORPORATION, Anan-shi (JP)
Filed by NICHIA CORPORATION, Anan (JP)
Filed on Nov. 10, 2023, as Appl. No. 18/507,017.
Claims priority of application No. 2022-181415 (JP), filed on Nov. 11, 2022.
Prior Publication US 2024/0159952 A1, May 16, 2024
Int. Cl. F21V 8/00 (2006.01)
CPC G02B 6/0023 (2013.01) 7 Claims
OG exemplary drawing
 
1. A planar light source comprising:
a support member;
a light guide member comprising a first surface located proximate to an upper surface of the support member, a second surface opposite to the first surface, and a through hole extending from the first surface to the second surface;
a light source unit comprising a light-emitting element and a wavelength conversion member that covers an upper surface and a lateral surface of the light-emitting element, the light source unit disposed on the support member in the through hole;
a light-transmissive member disposed between the light source unit and the light guide member in the through hole; and
a light adjustment member disposed on the light source unit and the light-transmissive member,
wherein the second surface of the light guide member is located higher than the first surface of the light guide member, and
wherein an upper surface of the wavelength conversion member of the light source unit is located higher than the second surface of the light guide member.