US 12,265,242 B2
Reflective polarizer and optical system
Fuguo Xu, Shanghai (CN); Adam D. Haag, Woodbury, MN (US); Martin E. Denker, Vadnais Heights, MN (US); and Timothy J. Nevitt, Red Wing, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 17/636,394
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Sep. 27, 2019, PCT No. PCT/CN2019/108348
§ 371(c)(1), (2) Date Feb. 18, 2022,
PCT Pub. No. WO2021/056372, PCT Pub. Date Apr. 1, 2021.
Prior Publication US 2022/0299692 A1, Sep. 22, 2022
Int. Cl. G02B 5/30 (2006.01); G02B 5/26 (2006.01); H10K 50/86 (2023.01); H10K 59/35 (2023.01); H10K 59/12 (2023.01)
CPC G02B 5/3041 (2013.01) [G02B 5/26 (2013.01); H10K 50/86 (2023.02); H10K 59/35 (2023.02); H10K 59/12 (2023.02)] 4 Claims
OG exemplary drawing
 
1. An optical system comprising:
an emissive display configured to emit an image and comprising a blue pixel configured to emit a blue light, the emitted blue light having a blue peak at a blue wavelength Ab;
a linear absorbing polarizer layer disposed on the display; and
a reflective polarizer disposed between the linear absorbing polarizer layer and the display and configured to receive the image emitted by the display, for substantially normally incident light: for the blue wavelength Ab, the reflective polarizer reflects at least 30% of the incident light having a first polarization state and transmits at least 75% of the incident light having an orthogonal second polarization state; and
for at least one wavelength Ai greater than Ab, Ai-Ab<50 nm, the reflective polarizer transmits at least 75% of the incident light for each of the first and second polarization states; and for the blue wavelength Ab, the reflective polarizer has a maximum optical transmittance Tmax for light incident at a first incident angle, and an optical transmittance Tmax/2 for light incident at a second incident angle greater than the first incident angle by less than about 50 degrees.