US 11,054,700 B2
Backlight
Takuma Horiuchi, Yamanashi-ken (JP); Takumi Miyashita, Yamanashi-ken (JP); and Kiyokazu Watanabe, Yamanashi-ken (JP)
Assigned to CITIZEN ELECTRONICS CO., LTD., Yamanashi-Ken (JP); and CITIZEN WATCH CO., LTD., Tokyo (JP)
Appl. No. 16/603,610
Filed by CITIZEN ELECTRONICS CO., LTD., Yamanashi-ken (JP); and CITIZEN WATCH CO., LTD., Tokyo (JP)
PCT Filed Apr. 23, 2018, PCT No. PCT/JP2018/016428
§ 371(c)(1), (2) Date Oct. 8, 2019,
PCT Pub. No. WO2018/199011, PCT Pub. Date Nov. 1, 2018.
Claims priority of application No. JP2017-086726 (JP), filed on Apr. 26, 2017.
Prior Publication US 2021/0109405 A1, Apr. 15, 2021
Int. Cl. G02F 1/13357 (2006.01)
CPC G02F 1/133606 (2013.01) [G02F 1/133603 (2013.01); G02F 1/133605 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A backlight comprising:
a mount substrate;
a plurality of LEDs mounted on the mount substrate;
a reflecting sheet mounted on the mount substrate such that the plurality of LEDs protrude beyond the reflecting sheet; and
a diffusion plate covering the plurality of LEDs with a gap provided between the diffusion plate and the plurality of LEDs,
wherein the diffusion plate has a flat portion and a plurality of protrusions on a lower surface of the diffusion plate, and
wherein the plurality of protrusions are disposed over respective intermediate portions disposed between the plurality of LEDs such that the plurality of protrusions are out of contact with the reflecting sheet.