Patent ID: 11947135
Assignee: 3M INNOVATIVE PROPERTIES COMPANY
Field: Optics (Instruments)
Classification: CPC G  B  E | IPC G

Claim 0:
1. A light control film, comprising:
a light input surface and a light output surface opposite the light input surface;
alternating transmissive regions and absorptive regions disposed between the light input surface and the light output surface, wherein the absorptive regions have an aspect ratio of at least 30 and the alternating transmissive regions and absorptive regions have a transmission as measured with a spectrophotometer at a viewing angle of 0 degrees of
i) at least 35% for a wavelength of the range 320-400 nm (UV), or
ii) at least 65% for a wavelength of the range 700-1400 nm (NIR), or a combination thereof,
wherein the maximum surface area that is blocked is less than 20% of the total alternating transmissive regions and absorptive regions, and wherein the absorptive regions comprise polyelectrolytes, wherein the absorptive regions comprise light-absorbing material ionically bonded to the polyelectrolytes.