US 12,222,507 B2
Optical waveguide structure, AR device, and method for obtaining emergent light efficiency of optical waveguide structure
Na Han, Beijing (CN); Chenru Wang, Beijing (CN); Ruijun Dong, Beijing (CN); Yulong Wu, Beijing (CN); Ke Li, Beijing (CN); Jiarong Bai, Beijing (CN); Zhanshan Ma, Beijing (CN); and Haitao Huang, Beijing (CN)
Assigned to Beijing BOE Display Technology Co., Ltd., Beijing (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
Appl. No. 17/790,000
Filed by Beijing BOE Display Technology Co., Ltd., Beijing (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed Sep. 1, 2021, PCT No. PCT/CN2021/116057
§ 371(c)(1), (2) Date Jun. 29, 2022,
PCT Pub. No. WO2023/028925, PCT Pub. Date Mar. 9, 2023.
Prior Publication US 2024/0184111 A1, Jun. 6, 2024
Int. Cl. G02B 6/34 (2006.01); G02B 5/18 (2006.01); G02B 27/01 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 5/1819 (2013.01); G02B 6/34 (2013.01)] 1 Claim
OG exemplary drawing
 
1. A method for obtaining an emergent light efficiency of an optical waveguide structure, comprising:
obtaining a diffraction efficiency and a reflection efficiency of each of coupling-out gratings in the optical waveguide structure; and
obtaining an emergent light efficiency of the optical waveguide structure according to the diffraction efficiency and the reflection efficiency;
obtaining the emergent light efficiency of the optical waveguide structure according to the diffraction efficiency and the reflection efficiency comprises:
obtaining the emergent light efficiency of the optical waveguide structure according to the following formula:

OG Complex Work Unit Math
wherein η represents the emergent light efficiency, n represents number of coupling-out gratings, N represents total number of coupling-out grating partitions, Rn-1 represents the reflection efficiency of the (n−1)th coupling-out grating, and Tn represents the diffraction efficiency of the nth coupling-out grating;
obtaining the diffraction efficiency of each of the coupling-out gratings in the optical waveguide structure according to the following formula:
Tn=(N−n+1)−1
wherein Tn represents the diffraction efficiency of the nth coupling-out grating, n represents the number of coupling-out gratings, and N represents the total number of coupling-out grating partitions.