Analysis on diffraction efficiency distribution of output extended grating in holographic waveguide display system

ZHANG Pan; YANG De-xing; XU Jian; GUO Yu-ning

doi:10.3788/YJYXS20142905.0703

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Analysis on diffraction efficiency distribution of output extended grating in holographic waveguide display system

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- Analysis on diffraction efficiency distribution of output extended grating in holographic waveguide display system
- Chinese Journal of Liquid Crystals and Displays Vol. 29, Issue 5, Pages: 703-708(2014)
- 作者机构：
  
  西北工业大学理学院陕西省光信息技术重点实验室,陕西西安,710072
- 作者简介：
- 基金信息：
- DOI：10.3788/YJYXS20142905.0703
  CLC： O439
- Received：24 March 2014，
  
  Revised：17 April 2014，
  
  Published Online：18 May 2014，
  
  Published：05 October 2014
- 稿件说明：
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张攀, 杨德兴, 徐健, 郭钰宁. 全息波导显示中输出扩展光栅的衍射效率分布分析[J]. 液晶与显示, 2014,29(5): 703-708

ZHANG Pan, YANG De-xing, XU Jian, GUO Yu-ning. Analysis on diffraction efficiency distribution of output extended grating in holographic waveguide display system[J]. , 2014,29(5): 703-708
张攀, 杨德兴, 徐健, 郭钰宁. 全息波导显示中输出扩展光栅的衍射效率分布分析[J]. 液晶与显示, 2014,29(5): 703-708 DOI： 10.3788/YJYXS20142905.0703.

ZHANG Pan, YANG De-xing, XU Jian, GUO Yu-ning. Analysis on diffraction efficiency distribution of output extended grating in holographic waveguide display system[J]. , 2014,29(5): 703-708 DOI： 10.3788/YJYXS20142905.0703.

摘要

对于全息波导显示系统，为获得连续的输出光瞳而引入的半透半反膜，会在波导中形成阶跃形光强分布，与阶跃形强度分布相匹配的输出光栅衍射效率须为阶跃形分布，这样才能获得均匀的衍射输出强度。为保证衍射角带宽内所有光线均有较佳的输出强度均匀性，提出了一种连续递增的衍射效率分布光栅模型。建立了基于对阶跃形衍射效率分布的分段加权平均和二次曲线拟合的优化计算模型，计算得到了衍射效率分布曲线，并由衍射效率分布曲线计算得到衍射角带宽内不同视场光束的输出光强分布。结果表明，输出光强位置均匀性最小为52.4%，出瞳内角度均匀性达到84.9%。随着分束膜层数的增加，波导阶跃形光强差将会减小，可获得更好的输出强度均匀性。

Abstract

For holographic waveguide display system

the beam splitting membrane

adopted for obtaining continuous output pupil

can form step-shaped light intensity distribution

and only when the diffraction efficiency of output grating is step-shaped distribution

can the uniform diffraction output intensity be obtained. To guarantee the output intensity uniformity of light within the diffraction angle bandwidth

a grating model which owns continuous increasing diffraction efficiency is established. Based on segmentation weighted average and quadratic curve fitting of the step-shaped distribution

the calculation model is optimized and curve of diffraction efficiency distribution is obtained. In addition

the output intensity distributions of various fields are calculated from the diffraction efficiency distribution curve. The results show that the minimum position uniformity of output area is 52.4% and angle uniformity within the whole exit pupil could reach to 84.9%. And analysis demonstrates that with the increase number of the beam splitting membrane

the intensity difference between the non-overlap and overlap region would be reduced and better image uniformity obtained.

关键词

Keywords

references

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