US 11,789,311 B2
Illumination device including a first and a second light reduction portion and a display device including the same
Takeshi Masuda, Kameyama (JP); Hisashi Watanabe, Kameyama (JP); and Hirotoshi Yasunaga, Kameyama (JP)
Assigned to Sharp Display Technology Corporation, Kameyama (JP)
Filed by Sharp Display Technology Corporation, Kameyama (JP)
Filed on Mar. 9, 2022, as Appl. No. 17/690,553.
Claims priority of application No. 2021-055846 (JP), filed on Mar. 29, 2021.
Prior Publication US 2022/0308399 A1, Sep. 29, 2022
Int. Cl. G02F 1/13357 (2006.01); F21V 8/00 (2006.01); G02F 1/1335 (2006.01)
CPC G02F 1/133606 (2013.01) [G02B 6/0055 (2013.01); G02B 6/0088 (2013.01); G02F 1/133601 (2021.01); G02F 1/133603 (2013.01); G02F 1/133614 (2021.01); G02F 1/133615 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An illumination device comprising:
a plurality of light sources;
a wavelength conversion sheet configured to perform wavelength conversion on light from the plurality of light sources; and
a first light reduction portion disposed in a frame shape as a whole overlapping an outer peripheral portion of the wavelength conversion sheet and not overlapping the plurality of light sources in a plan view between the plurality of light sources and the wavelength conversion sheet, the first light reduction portion being a light reflective portion configured to reduce a light amount by reflecting incident light,
wherein the first light reduction portion has a planar shape in which a pattern forming the frame shape is provided in a plurality of rows in a concentric annular shape, and
an area of the pattern increases from an inner side to an outer side in the concentric annular shape.