双自由曲面大视场头盔显示光学系统设计

视场大小是评价头盔显示器在虚拟现实等领域的关键性能指标, 为了克服视场增加带来各类像差急剧增大的困难, 提出了一种基于双自由曲面的大视场头盔显示光学系统。首先, 分析了双椭球结构实现大视场与低畸变的基本原理, 指出了其难以校正除畸变以外其他像差的原因。接着, 提出根据系统对称性和光路走向采用竖直方向对称、水平方向不对称的自由曲面反射镜校正离轴像差, 完成了基于双自由曲面反射镜的大视场头盔显示光学系统设计。系统视场范围为106.3°(H)×80°(V), 最大相对畸变为6.97%, 出瞳直径8 mm, 点眼距19 mm。单目系统向外倾斜8°时, 双目视场范围为122.3°(H)×80°(V), 双目重叠视场为90.3°(H)×80°(V), 瞳距在55~71 mm范围内可调节。对系统性能分析结果表明: 相比双椭球结构, 系统成像质量得到较大提高; 视场范围和相对畸变满足虚拟现实领域的应用要求。

Abstract

Field-of-view(FOV) is the key performance indicator to evaluate a head-mounted display (HMD) in areas such as virtual reality. In order to overcome the difficulties of a sharp increase of optical system aberrations with the increased FOV, a wide FOV HMD optical system with double freeform surfaces was proposed. First, the principles of the double ellipsoid HMD which could achieve large FOV and low distortion were analyzed, and the reason of the aberration correction limitations of the double ellipsoid HMD was pointed out. Then wide FOV HMD optical system with double freeform mirrors was proposed. Two free-form mirrors were used by the new optical system which were symmetrical in vertical direction and asymmetrical in horizontal direction to correct off-axis aberrations brought by increasing FOV. The FOV of the new optical system was 106.3°(H)×80°(V). The maximum relative distortion is 6.97%. The exit pupil diameter was 8 mm and the eye clearance distance was 19 mm. Through tilt outside 8° the binocular FOV was 122.3°(H)×80°(V) and the binocular overlapped FOV was 90.3°(H)×80°(V). The IPD is adjustable within 55-71 mm. The analysis of optical performance indicates that image quality is greatly improved, and the relative distortion and FOV can meet the application requirements of the virtual reality.

参考文献

[1] Keler K, State A, Fuchs H. Head mounted displays for medical use [J]. Journal of Display Technology, 2008, 4(4): 468-472.

[2] Meizer J E. Design evolution of a wide field of view head-mounted display for aircraft training and simulation[C]//SPIE, 2001, 4361: 24-29.

[3] 呼新荣, 刘英, 王健, 等. 基于视网膜扫描的头戴显示器研究现状[J]. 红外与激光工程, 2014, 43(3): 871-878.

Hu Xinrong, Liu Ying, Wang Jian, et al. Current progress in head-mounted display based on retinal scanning[J]. Infrared and Laser Engineering, 2014, 43(3): 871-878. (in Chinese)

[4] 白瑜, 邢廷文, 蒋亚东, 等. 基于衍射光学的头盔显示光学系统[J]. 红外与激光工程, 2012, 41(10): 2753-2757.

Bai Yu, Xing Tingwen, Jiang Yadong, et al. Design of head-mounted display optical system with DOE [J]. Infrared and Laser Engineering, 2012, 41(10): 2753-2757. (in Chinese)

[5] Cakmakci O, Rolland J. Head-worn displays: a review [J]. Journal of Display Technology, 2006, 2(3): 199-216.

[6] Hoppe M J, Melzer J E. Optical tiling for wide field-of-view head-mounted displays [C]//SPIE, 1999, 3779: 146-153.

[7] Cheng D W, Wang Y T, Hua H, et al. Design of a wide-angle, lightweight head-mounted display using free-form optics tiling [J]. Optics Letters, 2011, 36(11): 2098-2100.

[8] Roger B Huxford. Wide FOV head mounted display using hybrid optics [C]//SPIE, 2004, 5249: 230-237.

[9] Ashok Sisodia, Riser A, Rogers J R, et al. Design of an advanced helmet mounted display (AHMD)[C]//SPIE, 2005, 5801: 304-315.

[10] Yang J M, Liu W Q, Lv W Z, et al. Method of achieving a wide field-of-view head-mounted display with small distortion[J]. Optics Letters, 2013, 38(12): 2035-2037.

[11] 刘伟奇, 杨建明, 姜国华, 等. 采用旋转对称透镜的双椭球结构大视场头盔显示光学系统: 中国专利, 201510143657.8[P]． 2015-04-02.

Liu Weiqi, Yang Jianming, Jiang Guohua, et al. A wide field-of-view head-mounted display optical system of double elliposid structure with rotating symmetric Lenses: Chinese Patent, 201510143657.8[P]. 2015-04-02. (in Chinese)

[12] ZEMAX Development Corporation. Optical Design Program User's Guide [EB/OL]. [2009-06-09]. http: //www.zemax.com.

[13] Zheng Z R, Liu X, Li H, et al. Design and fabrication of an off-axis see-through head-mounted display with an x-y polynomial surface [J]. Applied Optics, 2010, 49(19): 3661-3668.

孟祥翔, 刘伟奇, 张大亮, 姜国华, 朱秀庆, 杨建明. 双自由曲面大视场头盔显示光学系统设计[J]. 红外与激光工程, 2016, 45(4): 0418004. Meng Xiangxiang, Liu Weiqi, Zhang Daliang, Jiang Guohua, Zhu Xiuqing, Yang Jianming. Design of wide field-of-view head-mounted display optical system with double freeform surfaces[J]. Infrared and Laser Engineering, 2016, 45(4): 0418004.

双自由曲面大视场头盔显示光学系统设计

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