多焦近眼显示:光学扩散元件的定时和基于dlp的投影微处理器的同步

IF 0.5 Q4 PHYSICS, APPLIED Latvian Journal of Physics and Technical Sciences Pub Date : 2022-06-01 DOI:10.2478/lpts-2022-0013
R. Ruskuls, K. Slics, R. Ozoliņš, R. Fenuks, E. Linina, K. Osmanis, I. Osmanis
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引用次数: 0

摘要

摘要介绍了多焦点近眼显示技术的关键技术细节。除了对基本架构的概述外,本研究还提供了一种利用基于数字光处理(DLP®)的空间光调制器作为图像源的特定实现。所研究的方法涉及利用基于液晶技术的快速开关光学扩散元件堆叠形成的小型体积屏幕。体积屏幕由后方图像投影仪照亮。为了使整个系统功能强大且体积小,挑战在于投影模块的集成控制板的开发以及DLP®投影机图像输出与光学扩散器元件切换周期的同步。开发过程的主要困难是考虑内部开发的扩散器元件和现成的DLP®的特性,这是本文的主要焦点。没有对DLP®的全部操作参数的直接控制,提出了一种调整帧死区时间的间接方法,表明死区时间增加接近0.3 ms(在特定设置中从0.3 ms增加到0.6 ms)可以在不显着牺牲图像颜色深度或质量的情况下实现。可调死区时间减轻了液晶扩散元件的非瞬时切换设置的限制,因为较长的死区时间允许在帧之间去除图像出血。
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Multifocal Near-Eye Display: Timing of Optical Diffuser Elements and Synchronization to DLP-Based Projection Microunit
Abstract The paper present the key technical details of a multifocal near-eye display concept. Along with an overview of the basic architecture, a particular implementation that utilises a digital light processing (DLP®) based spatial light modulator as the image source is provided in the study. The investigated approach involves the utilisation of a small-scale volumetric screen formed by a stack of fast-switching optical diffuser elements based on liquid crystal technology. The volumetric screen is illuminated by a rear image projector. To make the whole system functional and small, the challenge lies within the development of integrated control board for the projection modules as well as the synchronization of the DLP® projector image output to the optical diffuser element switching-cycle. The main difficulty of the development process is accounting for the peculiarities of in-house developed diffuser elements and the off-the-shelf DLP®, which is the main focus of this paper. There is no direct control over the full set of DLP® operational parameters, an indirect method for adjusting frame dead time is proposed, showing that an increase in dead time close to 0.3 ms (from 0.3 ms to 0.6 ms in the particular setup) can be achieved without significantly sacrificing image colour depth or quality. Tuneable dead time mitigates the limitations set by the non-instantaneous switching of liquid crystal diffuser elements as longer dead times allow for the removal of image bleeding between frames.
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来源期刊
CiteScore
1.50
自引率
16.70%
发文量
41
审稿时长
5 weeks
期刊介绍: Latvian Journal of Physics and Technical Sciences (Latvijas Fizikas un Tehnisko Zinātņu Žurnāls) publishes experimental and theoretical papers containing results not published previously and review articles. Its scope includes Energy and Power, Energy Engineering, Energy Policy and Economics, Physical Sciences, Physics and Applied Physics in Engineering, Astronomy and Spectroscopy.
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