US 12,235,487 B1
Backlight module
Chi Fang, Miao-Li County (TW); and Wei-Tsung Hsu, Miao-Li County (TW)
Assigned to INNOLUX CORPORATION, Chu-Nan (TW)
Filed by InnoLux Corporation, Miao-Li County (TW)
Filed on Jul. 16, 2024, as Appl. No. 18/774,081.
Claims priority of application No. 202311029743.7 (CN), filed on Aug. 16, 2023.
Int. Cl. F21V 8/00 (2006.01)
CPC G02B 6/0051 (2013.01) [G02B 6/0053 (2013.01); G02B 6/0088 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A backlight module, comprising:
a back plate;
a light source disposed on the back plate; and
a first optical film disposed on the back plate, wherein the first optical film includes a first upper surface and a first lower surface, and the first upper surface is farther away from the back plate than the first lower surface, and has a first prism structure,
wherein, at a first angle, a second angle and a third angle, the backlight module respectively has a first brightness value, a second brightness value and a third brightness value, which satisfy:
|[(A/C)−(B/C)]×100%|≥10%,
where A represents the first brightness value, B represents the second brightness value, C represents the third brightness value, the third brightness value is a maximum brightness value of the backlight module, and the first angle, the second angle and the third angle are different from each other.