Driving Scheme Optimization for Electrowetting Displays Based on Contact Angle Hysteresis to Achieve Precise Gray-Scales

Frontiers in Physics

Zhenyu Yi¹  Jiaxuan Li¹  Hu Zhang²  Pengchang Ma³  Qiming Wan³  Jitao Zhang³  Li Wang³  Wei Li⁴ 

[1] College of Electron and Information, Zhongshan Institute, University of Electronic Science and Technology of China, Zhongshan, China;School of Electronic Science and Engineering (National Exemplary School of Microelectronics), University of Electronic Science and Technology of China, Chengdu, China;School of Information Engineering, Zhongshan Polytechnic, Zhongshan, China;South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, China;

关键词: electrowetting display;    contact angle hysteresis;    alternating current voltage;    driving scheme;    aperture ratio;   

DOI  :  10.3389/fphy.2021.655547

来源: Frontiers

【 摘 要 】

As a new display technology, electrowetting display (EWD) has many excellent display characteristics, such as paper-like, low power consumption, quick response and full color. These characteristics make EWD devices very suitable for portable devices. However, the gray-scale distortion caused by the contact angle hysteresis of EWDs seriously affects the accuracy of gray-scale display. To improve this phenomenon, the hysteresis curve of an EWD panel was studied according to the motion characteristics of advancing contact angle and receding contact angle of oil in a pixel. Then, a driving scheme for EWDs using alternating current (AC) voltage instead of direct current (DC) voltage was proposed in this paper. And the advantages and disadvantages of the driving scheme at different AC frequencies from 90 to 2,700 Hz were analyzed through experiments. According to the stability of aperture ratio in EWDs, a 470 Hz AC driving scheme was determined. Experimental results showed that the aperture ratio distortion of EWDs could be reduced from 35.82 to 5.97%, which significantly improved the display performance of pixel units.

【 授权许可】

CC BY