Design of discretely depth-varying holographic grating for image guide based see-through and near-to-eye displays

被引:18
|
作者
Nakamura, Toshiteru [1 ]
Takashima, Yuzuru [2 ]
机构
[1] Hitachi Ltd, Ctr Technol Innovat Elect, Totsuka Ku, 292 Yabe Cho, Yokohama, Kanagawa 2440817, Japan
[2] Univ Arizona, Coll Opt Sci, 1630 E Univ Blvd, Tucson, AZ 85721 USA
来源
OPTICS EXPRESS | 2018年 / 26卷 / 20期
关键词
DISPLACEMENT TALBOT LITHOGRAPHY; COUPLED-WAVE ANALYSIS; REFRACTIVE-INDEX;
D O I
10.1364/OE.26.026520
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
For the sec-through and near-to-eye displays, light throughput and uniformity of luminance over the field of view are improved by employing an optical image guide with discretely depth-varying surface relief holographic gratings. In the design process, a newly developed mathematical model, in conjunction with rigorous coupled wave analysis of diffraction efficiency, eliminates massive and time consuming iteration of non-sequential ray tracing but rapidly identifies the depth-varying structure and optimum optical perfonnance. The depth-varying grating based approach achieved a 1.37x improvement in light throughput compared to the conventional depth un-varying design, 315 cd/m(2)/lm, along with improved uniformity over the field of view of 35 (H) x 20 (V) degrees with an eye box size of 17 (H) x 14 (V) mm. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
引用
收藏
页码:26520 / 26533
页数:14
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