摘要
设计了大视场头盔显示器的目视光学系统,用于满足头盔显示器对大视场、小畸变、高分辨率以及轻量化的苛刻要求。采用4×3阵列式排列、视场角为33°×24°的12组高质量成像目镜系统拼接成单眼目视光学系统来实现系统的大视场设计。为了使系统轻量化,每个单元目镜只采用一片透镜;透镜一面采用二元光学衍射面,利用其特殊色散特性校正目镜系统色差;另一面采用非球面,用于校正目镜光学系统的初、高级单色像差。其图像源为高亮度、高分辨率的OLED微显示器。设计结果显示:单目目视光学系统水平视场达到120°,垂直视场为60°,角分辨率为43pixel/(°);单个目镜系统传递函数在40lp/mm处,轴上视场高于0.62,全视场高于0.1;系统畸变小于3%;系统的双目视场为160°×60°,双目重叠视场为80°×60°。该设计实现了超大视场,满足头盔显示光学系统的成像要求。
An optical system for eyepieces was designed to meet the demand of a wide-angle head mounted display for the wide Field of View（FOV）,high resolving power and compact,light-weight structure.Twelve groups of high quality eyepieces with a FOV of 33°×24° arraged in a 4×3 array were stitched in a single-eye optical system to realize the design with a wider FOV.The eyepiece was made up of a lens which contained a diffractive surface and an aspheric surface.The dispersion characteristics of binary optical elements were used to correct the chromatic aberration,and the aspheric surface was selected to correct the aberrations（spherical aberration,astigmatism,coma and distortion）.Furthermore,an OLED micro-displayer was used to achieve compact and light-weight structure,and the field-of-viewing stitch was used to implement the wide field of view.Experiments show that obtained optical system can offer the horizontal FOV of 120° and the vertical FOV of 60°.Moreover,the resolving power is 43 pixel/degree,the MTF is higher than 0.1 at a spatial frequency of 30 lp/ mm across the entire visual field,and the maximum distortion is less than 3%.The optical system has perfect performance and can meet the domanial demands of virtual reality display and super-wide FOV.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2012年第5期979-987,共9页
Optics and Precision Engineering
基金
国家863高技术研究发展计划资助项目(No.2009AA032701)
国家自然科学基金青年科学基金资助项目(No.61007009)
关键词
头盔显示器
二元光学
非球面
视场拼接
光学设计
Head Mounted Display（HMD）
binary optics
aspheric surface
field-of-view stitching
optical design
