US 11,668,943 B2
Display device having diffraction gratings with reduced polarization sensitivity
Kang Luo, Austin, TX (US); Vikramjit Singh, Pflugerville, TX (US); Nai-Wen Pi, Plano, TX (US); Shuqiang Yang, Austin, TX (US); and Frank Y. Xu, Austin, TX (US)
Assigned to Magic leap, inc., Plantation, FL (US)
Filed by Magic Leap, Inc., Plantation, FL (US)
Filed on Apr. 8, 2022, as Appl. No. 17/716,921.
Application 17/716,921 is a continuation of application No. 16/930,897, filed on Jul. 16, 2020, granted, now 11,327,315.
Claims priority of provisional application 62/902,328, filed on Sep. 18, 2019.
Claims priority of provisional application 62/876,205, filed on Jul. 19, 2019.
Prior Publication US 2022/0229304 A1, Jul. 21, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G02B 27/01 (2006.01); G02B 6/34 (2006.01); G02B 5/18 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 6/34 (2013.01); G02B 27/0176 (2013.01); G02B 2027/0178 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An optical waveguide comprising:
a substrate configured to guide light coupled into the waveguide within the waveguide via total internal reflection; and
a blazed diffraction grating formed in the substrate or in a layer disposed over the substrate,
wherein the blazed diffraction grating has a first diffraction efficiency across a visible light spectrum for a first polarization over a range of angles for light incident thereon and has a second diffraction efficiency across the visible light spectrum for a second polarization over the range of angles for light incident thereon, the first diffraction efficiency being between 1 and 2 times the second diffraction efficiency.