Design Method of Equivalent Driving Waveform Based on Electrowetting Response Characteristics

Tian, Lixia; Li, Hao

doi:10.3389/fphy.2021.730078

Cited by 3 publications

(2 citation statements)

References 30 publications

(29 reference statements)

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“…The main reason for these multiple problems was the interaction between the structure of the EWD and its driving mechanism. Therefore, combining the EWD structure and driving mechanism to design the driving waveform is an effective way to improve the performance of EWDs [ 17 , 18 , 19 , 20 , 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

High-Performance Multi-Level Grayscale Conversion by Driving Waveform Optimization in Electrowetting Displays

Xu,

Yi,

Jiang

et al. 2024

Micromachines

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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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Section: Introductionmentioning

confidence: 99%

High-Performance Multi-Level Grayscale Conversion by Driving Waveform Optimization in Electrowetting Displays

Xu,

Yi,

Jiang

et al. 2024

Micromachines

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show abstract

“…A DC and AC driving waveform was proposed to suppress ink backflow and breakage [25]. In order to improve the response of electrowetting, an equivalent driving waveform was designed with an overdriving voltage [26]. For the sake of improving the aperture ratio of electrowetting, a driving waveform with a narrow descent slope, low voltage maintenance, and ascent slope was proposed to suppress ink backflow [27].…”

Section: Introductionmentioning

confidence: 99%

Research on Hydrodynamic Characteristics of Electronic Paper Pixels Based on Electrowetting

Chen,

Lin,

Mei

et al. 2023

Micromachines

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In this paper, we propose a driving waveform with a complex ramp pulse for an electrowetting display system. The relationship between the contact angle and viscosity of inks was calculated based on the fluid-motion characteristics of different viscosities. We obtained the suitable range of viscosity and voltage in the liquid–oil–solid three-phase contact display system. We carried out model simulation and driving waveform design. The result shows that the driving waveform improves the response speed and aperture ratio of electrowetting. The aperture ratio of electrowetting pixels is increased to 68.69%. This research is of great significance to optimizing the structure of fluid material and the design of driving waveforms in electrowetting displays.

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Driving waveform optimization of electrowetting displays based on pixel’s 2-D model for reducing oil reflux

Wang,

Yi,

Jiang

et al. 2024

Opt. Express

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Electrowetting displays (EWD) are believed to represent a new generation of electronic paper technology with fast responses, high reflectivity, and low power consumption. Despite their bright market prospects, the luminance stability of displays is still hindered by oil film reflux. So, we presented a combination of simulation and experimentation to enhance the performance of EWD. Firstly, an EWD simulation model was established using the phase field method (PFM). To ensure the accuracy of the model, it was proposed that the use of velocity field parameters could suppress mass non-conservation. During a 10-second simulation process, the total mass decreased by only 7.94x10-6%. Furthermore, the charge accumulation field was introduced to simulate oil film reflux. For the 5-second simulation, the maximum charge accumulation in the DC driving waveform was 2.61x10-5C/m2. Meanwhile, it was demonstrated that the AC driving waveform reduced charge accumulation in the three-phase contact line (TPCL) by 7.62% compared to the DC driving waveform. Based on this simulation model, a driving waveform was proposed, which included a driving waveform with a gradient changing waveform to achieve fast opening, and an alternating current (AC) driving waveform stage to inhibit the charge accumulation. The experimental results indicated that the maximum luminance fluctuation was 8.82, and the luminance data variance was 3.34 by using the proposed driving waveform. Compared to the traditional waveform, the response time was improved by 75.9%, the luminance was improved by 4.70%, and the luminance fluctuation stability improved by 79.34%.

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Design Method of Equivalent Driving Waveform Based on Electrowetting Response Characteristics

Cited by 3 publications

References 30 publications

High-Performance Multi-Level Grayscale Conversion by Driving Waveform Optimization in Electrowetting Displays

High-Performance Multi-Level Grayscale Conversion by Driving Waveform Optimization in Electrowetting Displays

Research on Hydrodynamic Characteristics of Electronic Paper Pixels Based on Electrowetting

Driving waveform optimization of electrowetting displays based on pixel’s 2-D model for reducing oil reflux

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