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Liquid Crystal Based Head-Up Display with Electrically Controlled Contrast Ratio

Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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Crystals 2019, 9(6), 311; https://doi.org/10.3390/cryst9060311
Received: 9 May 2019 / Revised: 7 June 2019 / Accepted: 14 June 2019 / Published: 18 June 2019
(This article belongs to the Special Issue Advances in Cholesteric Liquid Crystals)
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Abstract

With the growing demand for driving safety and convenience, Head-Up Displays (HUDs) have gained more and more interest in recent years. In this paper, we propose a HUD system with the ability to adjust the relative brightness of ambient light and virtual information light. The key components of the system include a cholesteric liquid crystal (CLC) film, a geometric phase (GP) liquid crystal lens, and a circular polarizer. By controlling the voltage applied to the GP lens, the contrast ratio of the virtual information light to ambient light could be continuously tuned, so that good visibility could always be obtained under different driving conditions. View Full-Text
Keywords: geometry phase; cholesteric liquid crystal; head-up display geometry phase; cholesteric liquid crystal; head-up display
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Liu, Y.; Li, Y.; Chen, Q.; Li, S.; Su, Y. Liquid Crystal Based Head-Up Display with Electrically Controlled Contrast Ratio. Crystals 2019, 9, 311.

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