Next Article in Journal
Effect of Local Recrystallized Grains on the Low Cycle Fatigue Behavior of a Nickel-Based Single Crystal Superalloy
Previous Article in Journal
Effect of Nitrogen Flow in Hydrogen/Nitrogen Plasma Annealing on Aluminum-Doped Zinc Oxide/Tin-Doped Indium Oxide Bilayer Films Applied in Low Emissivity Glass
Previous Article in Special Issue
Electro-Optical Properties of a Polymer Dispersed and Stabilized Cholesteric Liquid Crystals System Constructed by a Stepwise UV-Initiated Radical/Cationic Polymerization
Article Menu
Issue 6 (June) cover image

Export Article

Open AccessArticle

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

Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Author to whom correspondence should be addressed.
Crystals 2019, 9(6), 311;
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)
PDF [3049 KB, uploaded 18 June 2019]


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

Figure 1

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).

Share & Cite This Article

MDPI and ACS Style

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.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Crystals EISSN 2073-4352 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top