Practical Chromatic Aberration Correction in Virtual Reality Displays Enabled by Cost‐Effective Ultra‐Broadband Liquid Crystal Polymer Lenses,Advanced Optical Materials

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Practical Chromatic Aberration Correction in Virtual Reality Displays Enabled by Cost‐Effective Ultra‐Broadband Liquid Crystal Polymer Lenses
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2019-10-25 , DOI: 10.1002/adom.201901360
Tao Zhan ₁ , Junyu Zou ₁ , Jianghao Xiong ₁ , Xiaomin Liu _{1,

2} , Hao Chen ₁ , Jilin Yang ₃ , Sheng Liu ₃ , Yajie Dong _{1,

4} , Shin‐Tson Wu ₁

Affiliation

Chromatic aberration (CA) is a critical issue in immersive virtual reality displays. The current digital compensation method can reduce the CA by pre‐processing the image contents but at the cost of extra memory space, processing time, and power consumption. Moreover, it is not possible to digitally compensate the CA within each color channel. Here, a practical optical approach is presented to correct the CAs, including the sub‐channel ones, in the virtual reality system, whose functionality is verified by both ray‐tracing analysis and experimental results. In this device, a compact ultra‐broadband Pancharatnam‐Berry phase lens (PBL) with complex axial molecular structure is fabricated and then hybridized with a refractive Fresnel lens. Due to their opposite chromatic dispersion, the system's CA is significantly reduced. To eliminate ghost image from the zero‐order leakage of PBL, a broadband circular polarizer is implemented to block the stray light. As a result, clear image within the entire 100° field‐of‐view is achieved. The proposed large‐size cost‐efficient broadband wide‐view flat optics can practically benefit not only virtual reality displays but also general imaging systems for practical applications and scientific research.

中文翻译：

具有成本效益的超宽带液晶聚合物镜片可实现虚拟现实显示器中的实用色差校正

色差（CA）是沉浸式虚拟现实显示器中的关键问题。当前的数字补偿方法可以通过预处理图像内容来减少CA，但要付出额外的存储空间，处理时间和功耗的代价。此外，不可能对每个颜色通道内的CA进行数字补偿。在此，提出了一种实用的光学方法来校正虚拟现实系统中的CA（包括子通道CA），其功能已通过光线跟踪分析和实验结果进行了验证。在该装置中，制造了具有复杂轴向分子结构的紧凑型超宽带Pancharatnam-Berry相透镜（PBL），然后与折射菲涅耳透镜混合。由于它们相反的色散，因此大大降低了系统的CA。为了消除PBL零级泄漏的重影，采用了宽带圆偏振器来阻挡杂散光。结果，可以在整个100°视野内获得清晰的图像。拟议中的具有成本效益的大型宽带宽视平面光学器件不仅可以使虚拟现实显示器受益，而且可以为实际应用和科学研究提供通用的成像系统。

更新日期：2020-01-17

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