视网膜投影显示系统设计

针对传统透射型头盔显示器在眼睛调节焦距时,二维虚拟信息在视网膜上无法清晰成像问题,提出一种新型的透射型头盔显示器。采用麦克斯韦观察法原理,用微型LCD结合激光直接将图像成像到视网膜上,成像面独立于眼睛的调节,其目的是眼睛在调节过程中,图像总是清晰的。讨论了透射型头盔显示器显示原理,根据系统参数选择合适的初始结构,设计了光学系统,根据系统整体结构对混合现实的需要,加入半透半反结构,通过ZEMAX软件对系统进行优化。最后对系统功能做了验证,结果表明系统轴上视场MTF达到了衍射极限。

基于人眼特性的分区时分复用3D视网膜投影显示

为克服传统视网膜投影显示技术存在的出瞳小、无法获得单眼调焦深度信息的局限,提出了一种基于麦克斯韦视图的分区时分复用3D视网膜投影显示技术。根据人眼视觉特性将虚拟场景分为边缘背景区域和中心注视区域:对中心注视区域采用时分复用的3D视网膜投影显示技术,实现了具有单眼调焦深度信息的真3D显示,同时增大了出瞳面积。对边缘背景区域采用短焦目镜和液晶显示器件实现了大视角显示。利用半透半反镜实现了边缘和中心区域的图像融合。构建了一套基于LED阵列、数字微镜器件、液晶显示器等光电器件的实验显示系统,实现了大出瞳、宽视角的真3D视网膜投影显示,验证了技术方案的可行性。

Retinal projection head-mounted display

Retinal projection displays （RPDs） are an important development direction for head-mounted dis- plays （HMDs）. This paper reviews the literature on optical engineering aspects based on the data on advanced technology in RPD design and development. The review includes the principles and applications of four theories, e. g., the Maxwellian view and its modified modality and the monocular and binocular depth cues of stereoscopic objects in the physiology of the human visual system. To support the Maxwellian view and achieve retinal projec- tion systems with depth cues, results of previous design works were summarized using different methods and their advantages and disadvantages are analyzed. With an extremely long focal depth, a prototype of a full-color stereoscopic see-through RPD system was discussed. Finally, a brief outlook of the future development trends and applications of the RPDs was presented