US 11,953,712 B2
Display device
Ken Onoda, Tokyo (JP); Shinichi Komura, Tokyo (JP); Koichi Okuda, Tokyo (JP); and Hiroaki Kijima, Tokyo (JP)
Assigned to JAPAN DISPLAY INC., Tokyo (JP)
Filed by Japan Display Inc., Tokyo (JP)
Filed on May 9, 2023, as Appl. No. 18/314,149.
Application 18/314,149 is a continuation of application No. 17/970,578, filed on Oct. 21, 2022, granted, now 11,693,171.
Claims priority of application No. 2021-173221 (JP), filed on Oct. 22, 2021.
Prior Publication US 2023/0280520 A1, Sep. 7, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. F21V 8/00 (2006.01)
CPC G02B 6/0038 (2013.01) [G02B 6/0068 (2013.01); G02B 6/0076 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An illumination device comprising:
a first light guide having a first main surface, a second main surface on a side opposite to the first main surface, a first side surface, and a second side surface on a side opposite to the first side surface;
a second light guide having a third main surface opposed to the second main surface, a fourth main surface on a side opposite to the third main surface, a third side surface close to the first side surface, and a fourth side surface located on a side opposite to the third side surface and close to the second side surface;
a plurality of first light sources opposed to the first side surface; and
a plurality of second light sources opposed to the fourth side surface, wherein
the first main surface includes a first plane and a plurality of first grooves located between the first plane and the first side surface,
the second main surface includes a plurality of second grooves opposed to the first plane and orthogonal to the first grooves, and a second plane located between the second grooves and the first side surface,
the third main surface includes a third plane and a plurality of third grooves located between the third plane and the fourth side surface and parallel to the first grooves, and
the fourth main surface includes a plurality of fourth grooves opposed to the third plane and orthogonal to the third grooves, and a fourth plane located between the fourth grooves and the fourth side surface.