摘要
微型化、轻型化的穿透式平板显示是近年来穿透式头盔显示的主要发展方向。本文针对传统的45°倾角半透膜阵列式平板显示的鬼像产生问题进行分析,提出了一种改进型的平板显示结构。通过减小膜层倾角,不仅使得各视场光线在波导中的倾角增加从而保证出瞳扩展,而且改变了产生鬼像光线的传播路径。同时,采用有膜层和无膜层的双层波导结构以及特定的尺寸限制,有效地约束鬼像产生的条件。根据分析计算,设计了一种膜层倾角为24°的系统结构,实现了水平和垂直方向的二维扩展,以及20°水平视场和13.4°垂直视场的显示输出。
In recent years, head-mounted display systems tend to develop into planar see-through display which is much smaller and lighter. Considering ghost images in planar display based on transparent film array with 45°inclination, a novel improved structure is proposed. By reducing inclination of films, the inclinations of different Field of View （FOV） in the waveguide increase, which means exit-pupil can be extended. In such case, beams that may cause ghost images also change their propagating paths. At the same time, dual-layer waveguide which has a filmed layer and a non-filmed layer can constrain conditions of ghost images when its size is limited. According to analysis and calculation, a design with 24°film inclination is presented, -which can realize horizontal and vertical expansion. The system can also achieve 20~ horizontal FOV and 13.4° vertical FOV.
出处
《光电工程》
CAS
CSCD
北大核心
2012年第5期145-150,共6页
Opto-Electronic Engineering
基金
国家重点基础研究发展计划资助项目(2009CB320803)
关键词
平板显示
头盔显示
半透膜阵列
鬼像
双层波导
planar display
head-mounted display
transparent film
ghost images
dual-layer waveguide
