Chinese Journal of Liquid Crystals and Displays, Volume. 40, Issue 4, 536(2025)
Simulation and experimental study of electrowetting high-speed zoom lens driven by alternating electric fields
To enhance the zoom speed of electrowetting lenses, a method utilizing vibration to achieve high-speed zoom is proposed. This method drives the liquid medium to undergo periodic oscillations using an alternating electric field. Based on the interface variation patterns and the focal length change curve, the imaging moments corresponding to different focal lengths are determined to complete the zooming process. Molecular dynamics simulations indicate that, with a constant frequency, the shape of the liquid-air interface, i.?e., the lens focal length, is time-dependent within one cycle. Different frequencies generate distinct liquid-air interface shapes. Experimental results show that controlling the frequency to induce resonance in the droplet or increasing the voltage can enhance the zoom speed. For a 5 μL deionized water droplet, under 110 Hz and 190 V AC driving, optimal zoom performance and image quality are achieved. The focal length can be adjusted from 0.821 mm to infinity within 2.250 ms, with the minimum instantaneous zoom speed being 0.512 mm/ms, representing a threefold increase in speed compared to existing lenses.
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Peng HUANG, Feiqiang ZHOU, Yue SONG, Yihang ZHOU, Guoqiang HE, Zhongyi XIE, Xinlong ZHANG. Simulation and experimental study of electrowetting high-speed zoom lens driven by alternating electric fields[J]. Chinese Journal of Liquid Crystals and Displays, 2025, 40(4): 536
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Received: Jan. 7, 2025
Accepted: --
Published Online: May. 21, 2025
The Author Email: Peng HUANG (huangpeng@glut.edu.cn)