Acta Optica Sinica, Volume. 38, Issue 7, 0722003(2018)
Design of Off-Axis Head-Mounted Display Optical System Based on Two Reflective Optical Free-Form Surfaces
Figures & Tables(8)
Fig. 2. Distributions of (a) system focal length and (b) full field of view at different exit pupils and F numbers
Fig. 3. Design of off-axis head-mounted display optical system based on two reflective free-form surfaces
Fig. 4. MTF curves of off-axis head-mounted display optical system based on two reflective free-form surfaces in different fields
Fig. 5. Distortion curves of off-axis head-mounted display optical system based on two reflective freeform surfaces
Fig. 6. Local sag maps of optical freeform surfaces of the off-axis reflective head-mounted display optical system. (a) Anamorphic free-form surface (the first freeform mirror); (b) XY polynomial freeform surface (the second free-form mirror)
Table 1. Comparison of design parameters of several different free-form head-mounted display optical systems
View tableTable 1. Comparison of design parameters of several different free-form head-mounted display optical systems
Year 2007[ 5 ]2010[ 17 ]2009[ 7 ]2010[ 8 ]2014[ 13 ]2014[ 12 ]Design result Exit pupil /mm 8 3 8 15 ≈5 8 EFL /mm ≈30 14.25 15 28.74 ≈23 30 F #≈3.75 4.75 1.875 ≈1.9 ≈4.6 3.75 FOV 20° 16(H)×12(V) ≈24° 19(H)×14.5(V) 53.5° 45(H)×32(V) 50° 40(H)×30(V) ≈25° 21(H)×12.4(V) 30° 24(H)×17(V) Eye relief /mm 15 >15 >17(18.25) >60(70) >15(≈17) 15 MTF value >20% @35 lp·mm-1 within central 3 mm pupil >10% @35 lp·mm-1 for all fields within all pupil >10% @30 lp·mm-1 within central 3 mm pupil >30% @30 lp·mm-1 for all fields within all pupil >10% @50 lp·mm-1 within central 3 mm pupil >40% @30 lp·mm-1 within central 4 mm pupil Display size 0.44 inch 4.8 mm×3.6 mm 0.61 inch 0.61 inch 8.5 mm×5 mm 0.61 inch Structure XY polynomialreflector and diffractive element Radial basis function based freeform reflector XY -typepolynomial surface with freeform prism Including XY polynomial freeform surface Zernike polynomial freeform reflector XY polynomialfreeform reflector Weight /g ≈250 much light 8 heavy much light much light Note: EFL is effective focal length; FOV is field of view; MTF is modulation transfer function; 1 inch=2.54 cm.
Table 2. Comparison of different design results of off-axis reflective head-mounted display optical systems
View tableTable 2. Comparison of different design results of off-axis reflective head-mounted display optical systems
Parameter Design 1[ 13 ]Design 2[ 12 ]Our design Exit pupil /mm ≈5 8 10 EFL /mm ≈23 30 30 F #≈4.6 3.75 3.0 FOV /(°) ≈25 30 28 Eye relief /mm ≈17 15 >15 MTF >0.1 @50 lp·mm-1 within central 3 mm pupil >0.4 @30 lp·mm-1 within central 4 mm pupil >0.15 @30 lp·mm-1 within central 6 mm pupil Distortion /% <6.2 <3.5 <4.5 Display size 8.5 mm×5 mm 850×500 10 μm·pixel-1 12.75 mm×9 mm 800×600 15 μm·pixel-1 12.6 mm×9 mm 800×600 15 μm·pixel-1 Surface type Zernike polynomial freeform surface XY polynomialfreeform surface Anamorphic+ XY polynomial freeform surface
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Jingfei Ye, Kaidi Xu, Mingzhu Yang, Zhenzhen Song, Shixin Pei, Lingbing Bu, Lu Chen, Zhishan Gao, Jun Yu, Zhengxiang Shen. Design of Off-Axis Head-Mounted Display Optical System Based on Two Reflective Optical Free-Form Surfaces[J]. Acta Optica Sinica, 2018, 38(7): 0722003
Paper Information
Category: Optical Design and Fabrication
Received: Dec. 26, 2017
Accepted: --
Published Online: Sep. 5, 2018
The Author Email: Ye Jingfei (yjfei1988@gmail.com)
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