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Search Results (3)

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Keywords = overdriving waveform

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17 pages, 6513 KiB  
Article
Design of Multi-DC Overdriving Waveform of Electrowetting Displays for Gray Scale Consistency
by Yijian Xu, Shixiao Li, Ziyang Wang, Heng Zhang, Zikai Li, Bo Xiao, Wei Guo, Linwei Liu and Pengfei Bai
Micromachines 2023, 14(3), 684; https://doi.org/10.3390/mi14030684 - 19 Mar 2023
Cited by 5 | Viewed by 2233
Abstract
Gray scale consistency in pixels was extremely important for electrowetting displays (EWDs). However, traditional electrowetting display driving waveforms could not obtain a pixel aperture ratio consistency, which led to the occurrence of gray inconsistency even if it was the same driving waveform. In [...] Read more.
Gray scale consistency in pixels was extremely important for electrowetting displays (EWDs). However, traditional electrowetting display driving waveforms could not obtain a pixel aperture ratio consistency, which led to the occurrence of gray inconsistency even if it was the same driving waveform. In addition, the oil backflow caused by charge trapping could not be sustained. Therefore, a multi-direct current (DC) overdriving waveform for gray scale consistency was proposed in this paper, which could effectively improve the performance of EWDs. The driving waveform was divided into a start-up driving phase and a stable driving phase. The stable driving phase was composed of a square wave with a duty cycle of 79% and a frequency of 43 Hz. Subsequently, an overdriving pulse was also introduced in the stable driving phase. The multi-DC driving waveform for gray scale consistency was applied to a thin film transistor-electrowetting display (TFT-EWD). The average difference between increasing driving voltage and decreasing driving voltage was only 2.79%. The proposed driving waveform has an aperture ratio of 3.7 times at low voltages compared to DC driving. Full article
(This article belongs to the Section E：Engineering and Technology)
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14 pages, 14070 KiB  
Article
Toward Suppressing Charge Trapping Based on a Combined Driving Waveform with an AC Reset Signal for Electro-Fluidic Displays
by Zhengxing Long, Zichuan Yi, Hu Zhang, Liming Liu and Lingling Shui
Membranes 2022, 12(11), 1072; https://doi.org/10.3390/membranes12111072 - 29 Oct 2022
Cited by 7 | Viewed by 1837
Abstract
Digital microfluidic technology based on the principle of electrowetting is developing rapidly. As an extension of this technology, electro-fluidic displays (EFDs) have gradually become a novel type of display devices, whose grayscales can be displayed by controlling oil film in pixels with a [...] Read more.
Digital microfluidic technology based on the principle of electrowetting is developing rapidly. As an extension of this technology, electro-fluidic displays (EFDs) have gradually become a novel type of display devices, whose grayscales can be displayed by controlling oil film in pixels with a microelectromechanical system (MEMS). Nevertheless, charge trapping can occur during EFDs’ driving process, which will produce the leakage current and seriously affect the performance of EFDs. Thus, an efficient driving waveform was proposed to resolve these defects in EFDs. It consisted of a driving stage and a stabilizing stage. Firstly, the response time of oil film was shortened by applying an overdriving voltage in the driving stage according to the principle of the electrowetting. Then, a direct current (DC) voltage was designed to display a target luminance by analyzing leakage current-voltage curves and a dielectric loss factor. Finally, an alternating current (AC) reset signal was applied in the stabilizing stage to suppress the charge trapping effect. The experiment results indicated that compared with a driving waveform with a reset signal and a combined driving waveform, the average luminance was improved by 3.4% and 9.7%, and the response time was reduced by 29.63% and 51.54%, respectively. Full article
(This article belongs to the Special Issue Microfluidics and MEMS Technology for Membranes II)
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12 pages, 2943 KiB  
Article
A Separated Reset Waveform Design for Suppressing Oil Backflow in Active Matrix Electrowetting Displays
by Linwei Liu, Pengfei Bai, Zichuan Yi and Guofu Zhou
Micromachines 2021, 12(5), 491; https://doi.org/10.3390/mi12050491 - 27 Apr 2021
Cited by 22 | Viewed by 2917
Abstract
The electrowetting display (EWD) is a kind of reflective paper-like display. Flicker and grayscale distortion are caused by oil backflow, which is one of the important factors restricting the wide application of EWDs. The charge embedding caused by the electric field force in [...] Read more.
The electrowetting display (EWD) is a kind of reflective paper-like display. Flicker and grayscale distortion are caused by oil backflow, which is one of the important factors restricting the wide application of EWDs. The charge embedding caused by the electric field force in the dielectric layer is the cause of oil backflow. To suppress oil backflow, a separated reset waveform based on the study of oil movement is proposed in this paper. The driving waveform is divided into two parts: a reset waveform and a grayscale waveform. The reset waveform generated by a reset circuit can be used to output various voltages. The grayscale waveform is set as a traditional PWM waveform. The reset waveform is composed of a charge-releasing stage and oil-moving back stage. Two phases are contained in the charge releasing stage. The overdriving voltage is used during the first phase to reverse the voltage of all pixels. The trapped charges can then be released from the dielectric layer during the second phase. A higher voltage is used during the oil-moving back stage to drive the oil faster in the pixel. By comparing the experimental data, the oil backflow time is extended 761 times by the reset waveform. The four grayscales can be maintained by the reset waveform after driving for 300 s. Full article
(This article belongs to the Special Issue Electrowetting and Smart/Programmable Liquid Interfaces in Microfluidics)
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