公开(公告)号：US20240162204A1

公开(公告)日：2024-05-16

申请号：US18550301

申请日：2022-04-04

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Yuhsin Lu ,  Bharat R. Acharya ,  Adam D. Haag

IPC: H01L25/075 ,  G02B5/30 ,  H01L27/15 ,  H01L33/50

CPC classification number: H01L25/0753 ,  G02B5/305 ,  H01L27/156 ,  H01L33/505

Abstract: A backlight includes a plurality of light sources, a reflective polarizer disposed on the plurality of light sources, and an optical film disposed between the reflective polarizer and the plurality of discrete spaced apart light sources. For a substantially collimated incident light, for a visible wavelength range, and for a first incident angle of less than about 5 degrees, the reflective polarizer has an average optical reflectance of at least 60% when the incident light is p-polarized and an average optical transmittance of at least 60% when the incident light is s-polarized. For the average of p-polarized and s-polarized incident lights and the visible wavelength range, the optical film has an average optical transmittance T1 for the first incident angle, and an average transmittance T2 for a second incident angle of greater than about 35 degrees, such that T1/T2≥1.5.