US 12,332,472 B2
Optical film, backlight module, and display device
Wei-Hsuan Chen, Kaohsiung (TW); Chung-Yung Tai, Kaohsiung (TW); Wen-Hao Cai, Kaohsiung (TW); and Chun-Yi Wu, Kaohsiung (TW)
Assigned to Radiant Opto-Electronics Corporation, Kaohsiung (TW)
Filed by Radiant Opto-Electronics Corporation, Kaohsiung (TW)
Filed on Sep. 5, 2023, as Appl. No. 18/461,466.
Application 18/461,466 is a continuation of application No. 17/852,668, filed on Jun. 29, 2022, granted, now 11,789,192.
Prior Publication US 2024/0004123 A1, Jan. 4, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F21V 8/00 (2006.01)
CPC G02B 6/0053 (2013.01) [G02B 6/0051 (2013.01)] 10 Claims
OG exemplary drawing
 
1. An optical film, comprising a light incident side and a light emitting side opposite to the light incident side, wherein a plurality of light incident microstructures are formed on the light incident side and dispersed on one plane, and each of the light incident microstructures is a tapered structure, wherein the extension direction of the optical film is defined as a first axis and a second axis perpendicular to the first axis, the cross-sectional shape of each of the light incident microstructure in the first axis is different from the cross-sectional shape in the second axis, and each of the light incident microstructures has a first optical surface and a second optical surface with the different slope and asymmetrical arrangement in the direction of the first axis as well as has a third optical surface and a fourth optical surface with the same slope and symmetrical arrangement in the direction of the second axis, thereby a brightness distribution emitted from the light emitting side of the optical film is non-symmetrical and deflects light to a specific direction with higher brightness as long as suppresses light to another different direction with lower brightness.