Photonics Research, Volume. 10, Issue 1, 21(2022)
Freeform OST-HMD system with large exit pupil diameter and vision correction capability
Fig. 1. Layout of the final OST-HMD system.
Fig. 2. Optical paths of the rays of different object fields.
Fig. 3. Schematic diagram of JMRCC basic principle, wherein
Fig. 4. Diopter adjustment diagram of freeform prism OST-HMD. (a) Traditional diopter adjustment scheme, where additional lens was added between human eye and prism. (b) Correct hyperopia through auxiliary prism with convex
Fig. 5. Schematic diagram of distortion control. (a) For rotational symmetry system, radial distance of
Fig. 6. Distortion grids of the previous system and present system. (a) Distortion grid of the previous virtual image light path, maximum ratio is 12% [26]. (b) Distortion grid of the previous see-through path, maximum ratio is 1.4%. [26]. (c) Distortion grid of the present virtual image light path, maximum ratio is 0.6% without anamorphosis. (d) Distortion grid of the present see-through path, the maximum ratio is 0.4% without anamorphosis.
Fig. 7. See-through MTF plot of the previous and present systems. (a) MTF plot of previous design in Ref. [26], the value is higher than 0.4 for most fields at 50 lp/mm. (b) MTF plot of present design, the value is higher than 0.9 for all fields at 50 lp/mm.
Fig. 8. (a) Error function variation curve. (b) Final optical layout of the OST-HMD.
Fig. 9. MTF plot of the optical system. (a) The MTF plot before automatic balancing, MTF value is higher than 0.18 at 50 lp/mm for all fields. (b) The MTF plot after automatic balancing, MTF value is higher than 0.4 at 50 lp/mm for all fields.
Fig. 10. MTF plots for different eye positions. (a) MTF plot when eye locates in center of eyebox. (b) MTF plot when human eye moves 2.5 mm to the right. (c) MTF plot when human eye moves up 2.5 mm.
Fig. 11. Probable change of MTF value with four different cumulative probabilities for overall tolerance analysis using tolerances values listed in Table
Fig. 12. Components and prototype of the optical system. (a) Exploded view showing all elements of the system. (b) Overall appearance of the prototype.
Fig. 13. Testing results of the optical prototype. (a) The input image displayed in microdisplay when testing the performance of the system. (b) Output image captured by camera at exit pupil of the system. (c) The result of fusion of virtual cup and real cup.
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Dewen Cheng, Jiaxi Duan, Hailong Chen, He Wang, Danyang Li, Qiwei Wang, Qichao Hou, Tong Yang, Weihong Hou, Donghua Wang, Xiaoyu Chi, Bin Jiang, Yongtian Wang, "Freeform OST-HMD system with large exit pupil diameter and vision correction capability," Photonics Res. 10, 21 (2022)
Category: Imaging Systems, Microscopy, and Displays
Received: Aug. 9, 2021
Accepted: Nov. 1, 2021
Published Online: Dec. 9, 2021
The Author Email: Yongtian Wang (wyt@bit.edu.cn)