US 11,994,767 B2
Lighting device using wavelength conversion sheet, and display device using the same
Hirotoshi Yasunaga, Sakai (JP); Takeshi Masuda, Sakai (JP); Hisashi Watanabe, Sakai (JP); and Youzou Kyoukane, Sakai (JP)
Assigned to SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed on Mar. 28, 2023, as Appl. No. 18/127,520.
Claims priority of application No. 2022-055288 (JP), filed on Mar. 30, 2022.
Prior Publication US 2023/0314872 A1, Oct. 5, 2023
Int. Cl. G02F 1/13357 (2006.01); G02F 1/1335 (2006.01); H01L 33/50 (2010.01)
CPC G02F 1/133603 (2013.01) [G02F 1/133607 (2021.01); H01L 33/504 (2013.01); H01L 33/505 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A lighting device comprising:
a plurality of light sources arranged side by side in a plane; and
a wavelength conversion sheet arranged to face a light emitting surface of each of the plurality of light sources and converting a wavelength of light from the plurality of light sources,
wherein the wavelength conversion sheet includes:
a base material having transparency, and
a wavelength conversion layer, in which a plurality of protrusions containing a wavelength conversion material and having a spherical surface, is arranged side by side without gaps on a principal surface of the base material opposite the plurality of light sources,
the wavelength conversion layer is provided on each of a pair of principal surfaces of the base material, and
centers of the plurality of protrusions in a plan view are arranged at different positions in the wavelength conversion layer provided on one of the pair of principal surfaces and the wavelength conversion layer provided on another one of the pair of principal surfaces.