US 11,054,562 B2
Polarized illumination systems
William L. Tonar, Holland, MI (US); David J. Cammenga, Zeeland, MI (US); and Kurtis L. Geerlings, Zeeland, MI (US)
Assigned to GENTEX CORPORATION, Zeeland, MI (US)
Filed by Gentex Corporation, Zeeland, MI (US)
Filed on Aug. 24, 2018, as Appl. No. 16/111,353.
Claims priority of provisional application 62/551,926, filed on Aug. 30, 2017.
Prior Publication US 2019/0064414 A1, Feb. 28, 2019
Int. Cl. G02B 5/30 (2006.01); G02B 5/22 (2006.01); G02B 5/26 (2006.01); F21V 8/00 (2006.01)
CPC G02B 5/3025 (2013.01) [G02B 5/22 (2013.01); G02B 5/26 (2013.01); G02B 6/0006 (2013.01); G02B 6/0008 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An illumination system, comprising:
a light source configured to emit a first handedness polarization of light onto a body, the first handedness polarization of light having at least one of a circular and an elliptical polarization, wherein the body reflects a second handedness polarization of light that is opposite of the first handedness polarization of light; and
an optical filter configured to at least one of absorb and reflect the second handedness polarization of light and transmit the first handedness polarization of light, the optical filter including a dual brightness enhancement film and at least one of the following:
a quarter wave plate;
an optical retarder; and
a liquid crystal material.