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Xu W, Yi Z, Jiang M, Wang J, Long Z, Liu L, Chi F, Wang L, Wan Q. High-Performance Multi-Level Grayscale Conversion by Driving Waveform Optimization in Electrowetting Displays. MICROMACHINES 2024; 15:137. [PMID: 38258256 PMCID: PMC10819487 DOI: 10.3390/mi15010137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 12/20/2023] [Accepted: 01/09/2024] [Indexed: 01/24/2024]
Abstract
As a new type of reflective display, electrowetting display (EWD) has excellent dynamic display performance, which is based on polymer coatings. However, there are still some issues which can limit its performance, such as oil backflow and the hysteresis effect which reduces the stability and response speed of EWDs. Therefore, an effective driving waveform was proposed to overcome these drawbacks, which consisted of grayscale conversions between low gray levels and high gray levels. In the driving waveform, to stabilize the EWD at any initial grayscale (low gray levels/high gray levels), an exponential function waveform and an AC signal were used. Then, the grayscale conversion was performed by using an AC signal with a switching voltage to quickly achieve the target grayscale. Finally, another AC signal was used to stabilize the EWD at the target grayscale. A set of driving waveforms in grayscale ranging across four levels was designed using this method. According to the experimental results, oil backflow and the hysteresis effect could be effectively attenuated by the proposed driving waveforms. During conversion, the response speed of EWDs was boosted by at least 9.37% compared to traditional driving waveforms.
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Affiliation(s)
- Wanzhen Xu
- School of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China; (W.X.); (M.J.); (J.W.); (Z.L.); (L.L.); (F.C.)
- South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Zichuan Yi
- School of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China; (W.X.); (M.J.); (J.W.); (Z.L.); (L.L.); (F.C.)
| | - Mouhua Jiang
- School of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China; (W.X.); (M.J.); (J.W.); (Z.L.); (L.L.); (F.C.)
- South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Jiashuai Wang
- School of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China; (W.X.); (M.J.); (J.W.); (Z.L.); (L.L.); (F.C.)
| | - Zhengxing Long
- School of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China; (W.X.); (M.J.); (J.W.); (Z.L.); (L.L.); (F.C.)
- School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China
| | - Liming Liu
- School of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China; (W.X.); (M.J.); (J.W.); (Z.L.); (L.L.); (F.C.)
| | - Feng Chi
- School of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, China; (W.X.); (M.J.); (J.W.); (Z.L.); (L.L.); (F.C.)
| | - Li Wang
- School of Information Engineering, Zhongshan Polytechnic, Zhongshan 528400, China; (L.W.); (Q.W.)
| | - Qiming Wan
- School of Information Engineering, Zhongshan Polytechnic, Zhongshan 528400, China; (L.W.); (Q.W.)
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