US 11,655,944 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 Jan. 6, 2022, as Appl. No. 17/569,525.
Claims priority of application No. JP2021-024054 (JP), filed on Feb. 18, 2021.
Prior Publication US 2022/0260217 A1, Aug. 18, 2022
Int. Cl. F21V 11/06 (2006.01); F21Y 115/10 (2016.01); F21K 9/233 (2016.01); F21K 9/61 (2016.01); F21V 8/00 (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)] 15 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 extends in a first direction and
a second louver which extends in an orthogonal direction to the first direction are superposed on the prism sheet,
wherein a liquid crystal lens is disposed above the prism sheet,
wherein the liquid crystal lens has a first electrode extending in a direction rotating by a first degree in a plan view from the first direction, and the first angle is 3 degrees or more.