US 12,474,518 B2
Wedge-shaped light guide plate for collimating backlight module, and collimating backlight module
Yulei Chen, Jiangsu (CN); Peng Wu, Jiangsu (CN); and Shujin Zhou, Jiangsu (CN)
Assigned to SUZHOU CRYSTALENT CO., LTD., Jiangsu (CN)
Appl. No. 18/285,387
Filed by SUZHOU CRYSTALENT CO., LTD., Jiangsu (CN)
PCT Filed Apr. 2, 2022, PCT No. PCT/CN2022/084947
§ 371(c)(1), (2) Date Oct. 3, 2023,
PCT Pub. No. WO2022/233208, PCT Pub. Date Nov. 10, 2022.
Claims priority of application No. 202110488532.4 (CN), filed on May 6, 2021.
Prior Publication US 2024/0184034 A1, Jun. 6, 2024
Int. Cl. G02B 6/00 (2006.01); F21V 8/00 (2006.01)
CPC G02B 6/0046 (2013.01) [G02B 6/0053 (2013.01); G02B 6/0055 (2013.01); G02B 6/0076 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A collimating backlight module comprising:
a wedge-shaped light guide plate comprising an incident surface at a thick end, a first light-emitting surface, a second light-emitting surface and two side surfaces, a wedge angle being formed between the first light-emitting surface and the second light-emitting surface, wherein an incident micro-prism structure is disposed on the incident surface, and a light-emitting micro-prism structure is disposed on at least one of the first light-emitting surface and the second light-emitting surface,
wherein the collimating backlight module is composed of at least one said wedge-shaped light guide plate, a strip-shaped light source disposed on a side of the incident surface of the wedge-shaped light guide plate, a reverse prism film disposed on a side of the first light-emitting surface, and a reflecting film disposed on a side of the second light-emitting surface, the strip-shaped light source extends from one of the side surface to the other side surface of the wedge-shaped light guide plate, and a side, provided with micro-prism structures, of the reverse prism film, faces the first light-emitting surface,
wherein the collimating backlight module comprises multiple said wedge-shaped light guide plates which are stacked together with one above the other, a first light-emitting micro-prism structure is disposed on the first light-emitting surface of the wedge-shaped light guide plate adjacent to the reverse prism film, and a second light-emitting micro-prism structure is disposed on the second light-emitting surface of the wedge-shaped light guide plate adjacent to the reflecting film.