The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 01, 2022
Filed:
Jan. 06, 2020
3m Innovative Properties Company, St. Paul, MN (US);
Quinn D. Sanford, Mosinee, WI (US);
Matthew B. Johnson, Woodbury, MN (US);
Ryan T. Fabick, Shoreview, MN (US);
Nathaniel K. Naismith, Woodbury, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A backlight () for an image forming device () includes spaced-apart front and back optical reflectors () defining an optical cavity () therebetween, and at least one light source () for emitting light into the optical cavity. The front optical reflector () is disposed between the image forming device and the back optical reflector (). For substantially normally incident light and for non-overlapping first (e.g. visible light) and second (e.g. infrared) wavelength ranges, the front optical reflector () may transmit () at least 70% of light () for each wavelength in the first wavelength range, and may reflect () at least 70% of light () for each wavelength in the second wavelength range. The back optical reflector () may reflect () at least 70% of light for each wavelength in the first wavelength range, and may transmit () at least 70% of light () for each wavelength in the second wavelength range. The light (90) emitted by the at least one light source () has at least one wavelength in the first wavelength range and at least one wavelength in the second wavelength range.