Design of diffractive waveguide collimating lens with high optical efficiency in edge field

HUANG Zhanhua; GAO Yibing; WU Yuanjun; PAN Cheng; LU Changtai; ZHANG Yinxin

doi:10.5768/JAO202445.0101008

Journal of Applied Optics > 2024 > 45(1): 54-62, 78. > DOI: 10.5768/JAO202445.0101008

HUANG Zhanhua, GAO Yibing, WU Yuanjun, PAN Cheng, LU Changtai, ZHANG Yinxin. Design of diffractive waveguide collimating lens with high optical efficiency in edge field[J]. Journal of Applied Optics, 2024, 45(1): 54-62, 78. DOI: 10.5768/JAO202445.0101008

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Design of diffractive waveguide collimating lens with high optical efficiency in edge field

HUANG Zhanhua^{1, 2, ,},
GAO Yibing^1,,
WU Yuanjun¹,
PAN Cheng^{1, 2},
LU Changtai^{1, 2},
ZHANG Yinxin¹

1.
Key Laboratory of Opto-Electronics Information Technology (Ministry of Education), School of Precision Instrument and Opto-Electronic Engineering, Tianjin University, Tianjin 300072, China
2.
Sichuan Innovation Research Institute, Tianjin University, Chengdu 610200, China

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Received Date: March 29, 2023
Revised Date: May 19, 2023
Available Online: December 22, 2023

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Abstract

Abstract

Augmented reality (AR) display systems are developing towards ultra-miniaturization with the use of micro-light emitting diodes (Micro-LED) as miniature image sources in AR display technology. However, the Micro-LED with a large luminous angle, the collimating lens with a small size and high image quality, and the low optical efficiency at the edge of the field of view (FOV) and nonuniform illumination by vignetting of the collimating lens pose challenges for the design of AR optical systems. To solve these problems, a collimating lens was designed with high uniformity of illumination and high optical efficiency of the edge field of view for the diffraction grating waveguide by adding the calculated aspherical field lens. Then, by analyzing the theory in detail, its surface shape parameters were solved, and the lens with relatively uniform illumination was designed. The new collimating lens had a diagonal FOV of 41.2°, an F/# (F^#) of 1.87, and a modulation transfer function greater than 0.5 at 125 lp/mm. The simulation results show that the illumination uniformity is relatively improved by 14%, and the optical efficiency of the edge FOV is relatively increased by 15%. The lens has good imaging performance, and can be applied in the ultra-small AR diffraction grating waveguide head-mounted display system.
- collimating lens,
- optical efficiency,
- diffraction grating waveguide,
- optical design

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References (28)

References

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Design of diffractive waveguide collimating lens with high optical efficiency in edge field