US 12,326,561 B2
Waveguide device and optical engine
Qing-Long Deng, Taoyuan (TW)
Assigned to HTC Corporation, Taoyuan (TW)
Filed by HTC Corporation, Taoyuan (TW)
Filed on Nov. 8, 2021, as Appl. No. 17/453,859.
Claims priority of provisional application 63/111,084, filed on Nov. 9, 2020.
Prior Publication US 2022/0146831 A1, May 12, 2022
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 6/0016 (2013.01); G02B 6/0035 (2013.01); G02B 6/0065 (2013.01); G02B 2027/0174 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A waveguide device, comprising:
a first diffractive element having a first grating configured to diffract light of a wavelength to propagate with a first diffraction angle;
a second diffractive element having a second grating configured to diffract the light of the wavelength to propagate with a second diffraction angle;
a third diffractive element having a third grating and a fourth grating, the third grating being configured to diffract the light of the wavelength to propagate with the first diffraction angle, and the fourth grating being configured to diffract the light of the wavelength to propagate with the second diffraction angle, wherein the third grating and the fourth grating intersect; and
a waveguide element configured to guide light propagated from the first diffractive element and the second diffractive element to the third diffractive element,
wherein the first diffractive element and the second diffractive element are at opposite sides of the waveguide element respectively.