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

Electronics

卷:8

Hai Deng¹  Guoqiang Li² 

[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;

关键词: liquid crystal driver;    digital charge pumps;    H-bridge inverters;    high voltage CMOS circuits;    electro-optic eyewear;    adaptive optics;    adaptive eyewear;    smart eyewear;   

DOI  :  10.3390/electronics8010014

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown