US 11,852,303 B2
Lighting device
Makoto Hasegawa, Tokyo (JP); Takeo Koito, Tokyo (JP); Nobuyuki Suzuki, Tokyo (JP); and Masafumi Okada, Tokyo (JP)
Assigned to JAPAN DISPLAY INC., Tokyo (JP)
Filed by Japan Display Inc., Tokyo (JP)
Filed on Apr. 20, 2023, as Appl. No. 18/136,881.
Application 18/136,881 is a continuation of application No. 17/569,525, filed on Jan. 6, 2022, granted, now 11,655,944.
Claims priority of application No. 2021-024054 (JP), filed on Feb. 18, 2021.
Prior Publication US 2023/0258304 A1, Aug. 17, 2023
Int. Cl. F21K 9/233 (2016.01); F21K 9/61 (2016.01); F21Y 115/10 (2016.01); F21V 8/00 (2006.01); F21V 11/06 (2006.01); F21V 14/00 (2018.01); F21V 5/00 (2018.01)
CPC F21K 9/233 (2016.08) [F21K 9/61 (2016.08); F21V 5/005 (2013.01); F21V 11/06 (2013.01); F21V 14/003 (2013.01); G02B 6/003 (2013.01); G02B 6/0053 (2013.01); F21Y 2115/10 (2016.08)] 8 Claims
OG exemplary drawing
 
1. A lighting device comprising:
a light guide,
LEDs set at a side surface of the light guide,
a prism sheet set on a major surface of the light guide,
wherein
a first louver which has first louver plates extending in a first direction are arranged on the prism sheet,
a second louver which has second louver plates extending in a second direction are arranged on the first louver, the second direction being different than the first direction,
the prism sheet has a prism array, which extends in a third direction, the third direction being different than the first and second directions, and
a liquid crystal lens is disposed above the prism sheet.