High-Performance Multi-Level Grayscale Conversion by Driving Waveform Optimization in Electrowetting Displays
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 respon...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-01-01
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| Series: | Micromachines |
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| Online Access: | https://www.mdpi.com/2072-666X/15/1/137 |
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| author | Wanzhen Xu Zichuan Yi Mouhua Jiang Jiashuai Wang Zhengxing Long Liming Liu Feng Chi Li Wang Qiming Wan |
| author_facet | Wanzhen Xu Zichuan Yi Mouhua Jiang Jiashuai Wang Zhengxing Long Liming Liu Feng Chi Li Wang Qiming Wan |
| author_sort | Wanzhen Xu |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-03-08T10:40:43Z |
| format | Article |
| id | doaj.art-c7e72708d8264f80b6d142f0f1e0cbe5 |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-08T10:40:43Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-c7e72708d8264f80b6d142f0f1e0cbe52024-01-26T17:45:27ZengMDPI AGMicromachines2072-666X2024-01-0115113710.3390/mi15010137High-Performance Multi-Level Grayscale Conversion by Driving Waveform Optimization in Electrowetting DisplaysWanzhen Xu0Zichuan Yi1Mouhua Jiang2Jiashuai Wang3Zhengxing Long4Liming Liu5Feng Chi6Li Wang7Qiming Wan8School of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, ChinaSchool of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, ChinaSchool of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, ChinaSchool of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, ChinaSchool of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, ChinaSchool of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, ChinaSchool of Electronic Information, University of Electronic Science and Technology of China, Zhongshan Institute, Zhongshan 528402, ChinaSchool of Information Engineering, Zhongshan Polytechnic, Zhongshan 528400, ChinaSchool of Information Engineering, Zhongshan Polytechnic, Zhongshan 528400, ChinaAs 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.https://www.mdpi.com/2072-666X/15/1/137electrowetting displaymulti-level grayscalegrayscale conversion |
| spellingShingle | Wanzhen Xu Zichuan Yi Mouhua Jiang Jiashuai Wang Zhengxing Long Liming Liu Feng Chi Li Wang Qiming Wan High-Performance Multi-Level Grayscale Conversion by Driving Waveform Optimization in Electrowetting Displays Micromachines electrowetting display multi-level grayscale grayscale conversion |
| title | High-Performance Multi-Level Grayscale Conversion by Driving Waveform Optimization in Electrowetting Displays |
| title_full | High-Performance Multi-Level Grayscale Conversion by Driving Waveform Optimization in Electrowetting Displays |
| title_fullStr | High-Performance Multi-Level Grayscale Conversion by Driving Waveform Optimization in Electrowetting Displays |
| title_full_unstemmed | High-Performance Multi-Level Grayscale Conversion by Driving Waveform Optimization in Electrowetting Displays |
| title_short | High-Performance Multi-Level Grayscale Conversion by Driving Waveform Optimization in Electrowetting Displays |
| title_sort | high performance multi level grayscale conversion by driving waveform optimization in electrowetting displays |
| topic | electrowetting display multi-level grayscale grayscale conversion |
| url | https://www.mdpi.com/2072-666X/15/1/137 |
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