Laser & Optoelectronics Progress, Volume. 60, Issue 5, 0522006(2023)
Design of Optical System for Dual-Channel Helmet-Mounted Display Based on Dual-Prism Structure
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Fig. 3. Two optical pupil sampling principles. (a) Gaussian product pupil sampling 6 rings 8 arms; (b) rectangular array pupil sampling 12×12
Fig. 4. Iterative optimization sequence. (a) Planar structure; (b) spherical structure; (c) free-form structure; (d) transmission channel structure; (e) dual-channel structure
Fig. 5. MTF curves of dual-channel system. (a) MTF curves of projection channel (exit pupil diameter 8.5 mm); (b) MTF curves of projection channel (exit pupil diameter 3 mm); (c) MTF curves of transmission channel (exit pupil diameter 8.5 mm); (d) MTF curves of transmission channel (exit pupil diameter 3 mm)
Fig. 6. Grid distortion of dual-channel system. (a) Projection channel; (b) transmission channel
Fig. 7. Image simulation of dual-channel system. (a) Projection channel; (b) transmission channel
Fig. 9. 2D field of view diagrams of RMS for dual-channel system. (a) 2D field of view of RMS spot radius of projection channel; (b) 2D field of view of RMS wavefront difference of transmission channel
Fig. 10. Evaluation of dynamic image quality of eye movement in dual-channel system. (a) Average RMS spot radius of projection channel; (b) average RMS wavefront difference of transmission channel
Table 1. Design indicators of dual-channel helmet-mounted display optical system
View tableTable 1. Design indicators of dual-channel helmet-mounted display optical system
Design parameter Value Exit pupil /mm 8.5 Eye distance /mm 21 Projection channel field of view angle /［（°）×（°）］ 39×22.5（diagonal 45°） Transmission channel field of view angle /［（°）×（°）］ 45×25.5（diagonal 52°） Projection distortion /% <8 Transmission distortion /% <3 Resolution /（pixel×pixel） 1920×1080@8.2 μm Working wavelength /nm 400-700 Volume（H×W×D）/（mm×mm×mm） <（43×32×15）
Table 2. Tolerance allocation for dual-channel helmet-mounted display system
View tableTable 2. Tolerance allocation for dual-channel helmet-mounted display system
Prism Surface type Machining tolerance Assembly tolerance Material tolerance Surface /μm Thickness /μm Interval /μm Decenter /μm Tilt /（´） Index Abbe /% L1 S1-free-form ±0.15 ±3.00 ±5.00 ±5.00 ±0.2 0.0008 0.08 S2-even asphere ±0.5 S3-free-form ±0.15 L2 S4-free-form ±0.15 ±5.00 — — — 0.0008 0.08 S5-even asphere ±0.50 S6-even asphere ±1.00 L3 S6-even asphere ±1.00 ±5.00 ±5.00 ±10.00 ±0.2 0.0008 0.08 S7-free-form ±0.25
Table 3. Comparison of design results of helmet-mounted display systems with different structural forms
View tableTable 3. Comparison of design results of helmet-mounted display systems with different structural forms
Item Design 1 Design 2 Design 3 Proposed design Result Exit pupil /mm 8 10 8 8.5 Eye distance /mm 21 20 20 21 Field of view angle /［（°）×（°）］ 67，60（H）×30（V） 28，23（H）×16（V） 25，20（H）×15（V） 45，39（H）×22.5（V） MTF >0.25@52 lp/mm >0.15@30 lp/mm >0.25@30 lp/mm >0.2@61 lp/mm Resolution /（pixel×pixel） 1920×1200@9.6 μm 800×600@15 μm 640×480@15 μm 1920×1080@8.2 μm Volume /（mm×mm×mm） >170×100×34 >20.7×23×20 >25×17×13 41.5×31.5×14.1 Special surface Free-form Free-form Free-form diffraction Free-form
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Shiwei Li, Jun Liu, Ming Gao, Lü Hong. Design of Optical System for Dual-Channel Helmet-Mounted Display Based on Dual-Prism Structure[J]. Laser & Optoelectronics Progress, 2023, 60(5): 0522006
Paper Information
Category: Optical Design and Fabrication
Received: Jun. 20, 2022
Accepted: Aug. 5, 2022
Published Online: Mar. 6, 2023
The Author Email: Jun Liu (junliu1990@163.com)
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