US 12,189,231 B2
Liquid crystal displays with polarized infrared illumination
Matthias T. Pfeiffer, Boulder, CO (US)
Assigned to New Vision Display, Inc., Roseville, CA (US)
Filed by New Vision Display, Inc., Roseville, CA (US)
Filed on Aug. 22, 2023, as Appl. No. 18/236,733.
Application 18/236,733 is a continuation of application No. 17/396,473, filed on Aug. 6, 2021, granted, now 11,768,398.
Prior Publication US 2023/0393430 A1, Dec. 7, 2023
Int. Cl. G02F 1/1335 (2006.01); B60Q 1/50 (2006.01); B60R 13/10 (2006.01); F21V 8/00 (2006.01); G02F 1/133 (2006.01)
CPC G02F 1/133536 (2013.01) [B60Q 1/503 (2013.01); B60R 13/105 (2013.01); G02B 6/0055 (2013.01); G02B 6/0056 (2013.01); G02F 1/13306 (2013.01); G02F 1/133512 (2013.01); G02F 1/133616 (2021.01); G02F 2203/02 (2013.01); G02F 2203/11 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An infrared transmissive and visible light reflective liquid crystal display system comprising:
a liquid crystal display comprising:
a liquid crystal display cell comprising:
a liquid crystal layer to control a polarization state of visible light and a polarization state of infrared light;
a front substrate;
a rear substrate; and
wherein the liquid crystal layer is located between the front substrate and the rear substrate;
a transmissive visible light front polarizer, wherein the visible light front polarizer is transparent to infrared light; and
a transmissive visible light rear polarizer, wherein the visible light rear polarizer is transparent to infrared light;
a polarized infrared light backlight illumination unit comprising a plurality of light sources, wherein at least one of the plurality of light sources emits infrared light;
a polarization conserving light guide;
a plurality of infrared polarizers between the plurality of light sources and the polarization conserving light guide;
and
a reflective layer behind the polarization conserving light guide to reflect visible and infrared light, wherein a display content is configured to be observed simultaneously by a viewer using reflected visible light and a polarized infrared camera system using light generated by the polarized infrared light backlight illumination unit.