	US 12,461,367 B2
	Near-eye display waveguide device and near-eye display apparatus
Zhentao Fan, Jiaxing (CN); Lei Sui, Jiaxing (CN); and Kehan Tian, Jiaxing (CN)
Assigned to JIAXING UPHOTON OPTOELECTRONICS TECHNOLOGY CO., LTD., Jiaxing (CN)
Filed by JIAXING UPHOTON OPTOELECTRONICS TECHNOLOGY CO., LTD., Jiaxing (CN)
Filed on Feb. 4, 2025, as Appl. No. 19/045,050.
Claims priority of application No. 202410166431.9 (CN), filed on Feb. 5, 2024.
Prior Publication US 2025/0251594 A1, Aug. 7, 2025
Int. Cl. G02B 27/01 (2006.01); G02B 5/18 (2006.01); G03H 1/00 (2006.01); G06F 3/01 (2006.01)

CPC G02B 27/0101 (2013.01) [G02B 5/1866 (2013.01)]

12 Claims

1. A near-eye display waveguide device, comprising m waveguide substrates stacked on each other, m being an integer and m>3, the near-eye display waveguide device receiving image-carrying light with an image field of view angle range, and the image-carrying light comprising light of less than m dominant wavelengths, wherein:

corresponding to each dominant wavelength, the m waveguide substrates are formed with at least two coupling-in gratings, the at least two coupling-in gratings are formed on different waveguide substrates and have different grating periods, for being used to couple light in different coupling-in field of view angle ranges into the corresponding waveguide substrates, wherein the coupling-in field of view angle ranges are each smaller than the image field of view angle range, and the coupling-in field of view angle ranges as a whole cover the image field of view angle range;

the m waveguide substrates are waveguide substrates W_i, i is an integer and 1≤i'm, wherein,

for i=1, a coupling-in grating G_(1,1)for a dominant wavelength λ₁is formed on a waveguide substrate W₁, and the coupling-in grating G_(1,1)has a grating period d₁;

for i=m, a coupling-in grating G_(m-1,2)for a dominant wavelength A_m-1is formed on a waveguide substrate W_m, and the coupling-in grating G_(m-1,2)has a grating period d_m; and

for 2≤i≤m−1, a coupling-in grating G_(i,1)for a dominant wavelength A_iand a coupling-in grating G_(i−1,2)for the dominant wavelength λ_i−1are formed on the waveguide substrate W_i, and satisfy: λ_i-1>λ_i>λ_i+1, wherein, for 2≤i≤m−1, the coupling-in grating G_(i,1)and the coupling-in grating G_(i-1,2)have different grating structure features, and the grating structure features comprise one or more of depth, height, duty cycle, blaze angle and optical coating of the gratings;

wherein, for 2≤i≤m−1, the coupling-in grating G_(i,1)and the coupling-in grating G_(i−1,2)have the same grating vector direction and grating period d_i, and d_i−1>d_i>d_i+1, and wherein, for 1≤i≤m−1: λ_i/d_iis approximately a constant C₁, and/or A_i/d_i+1 is approximately a constant C₂, wherein a deviation is within ±5%.