US 11,693,248 B1
TIR prisms and use of backlight for LCoS microdisplay illumination
Ishan Chatterjee, Seattle, WA (US); Dmitry Reshidko, Redmond, WA (US); and Bernard Charles Kress, Redmond, WA (US)
Assigned to Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed by Microsoft Technology Licensing, LLC, Redmond, WA (US)
Filed on Jan. 20, 2022, as Appl. No. 17/580,421.
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01); G02F 1/1362 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 6/005 (2013.01); G02B 6/0073 (2013.01); G02F 1/136277 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A display engine adapted for use with a head-mounted display (HIVID) device, comprising:
an LCoS (liquid crystal on silicon) spatial light modulator (SLM);
a backlight illumination module configured to provide illumination to the LCoS SLM for projecting virtual images for display by the HMD device; and
a pair of TIR (total internal reflection) prisms configured to provide a folded light path for the LCoS SLM illumination, the folded light path comprising a refraction path and a TIR path.