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Electronics 2019, 8(1), 14; https://doi.org/10.3390/electronics8010014

A High-Efficiency Low-Power Chip-Based CMOS Liquid Crystal Driver for Tunable Electro-Optic Eyewear

1,* and 2,3,4,*
1
Department of Electrical and Computer Engineering, Florida International University, Miami, FL 33174, USA
2
Visual and Biomedical Optics Lab, the Ohio State University, Columbus, OH 43212, USA
3
Versatile Research LLC, Columbus, OH 43220, USA
4
Biomolecular Sciences Institute, Florida International University, Miami, FL 33199, USA
*
Authors to whom correspondence should be addressed.
Received: 9 November 2018 / Revised: 15 December 2018 / Accepted: 17 December 2018 / Published: 22 December 2018
(This article belongs to the Section Microelectronics and Optoelectronics)
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Abstract

A high-efficiency low-power chip-based liquid crystal (LC) driver has been successfully designed and implemented for adaptive electro-optic eyewear including tunable vision correction devices (eyeglass, contact lens, intraocular lens, occluder, and prism), phoropter, iris, head-mounted display, and 3D imaging. The driver can generate a 1 kHz bipolar square wave with magnitude tunable from 0 V to 15 V to change the lens focus adaptively. The LC driver output magnitude is controlled by a reference DC voltage that is manually tunable between 0 and 3 V. A multi-mode 1×/2×/3×/4×/5× charge pump is developed for DC-DC conversion to expand the output range with a fast-sink function implemented to regulate the charge pump output. In addition, a new four-phase H-bridge driving scheme is employed to improve the DC/AC inverter efficiency. The LC driver has been successfully implemented and tested as an IC chip (8.6 mm × 8.6 mm) using AMS 0.18 μm High-Voltage CMOS technology. View Full-Text
Keywords: liquid crystal driver; digital charge pumps; H-bridge inverters; high voltage CMOS circuits; electro-optic eyewear; adaptive optics; adaptive eyewear; smart eyewear liquid crystal driver; digital charge pumps; H-bridge inverters; high voltage CMOS circuits; electro-optic eyewear; adaptive optics; adaptive eyewear; smart eyewear
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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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Deng, H.; Li, G. A High-Efficiency Low-Power Chip-Based CMOS Liquid Crystal Driver for Tunable Electro-Optic Eyewear. Electronics 2019, 8, 14.

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