Design of an Open Electrowetting on Dielectric Device Based on Printed Circuit Board by Using a Parafilm M

Yi, Zichuan; Feng, Haoqiang; Zhou, Xiaofeng; Shui, Lingling

doi:10.3389/fphy.2020.00193

Cited by 39 publications

(33 citation statements)

References 24 publications

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“…With the introduction of a dielectric layer between the conductive liquid and the metal electrode, the problem of electrolysis of the electrode has been solved [22]. And the electrowetting model with a dielectric layer introduced is called electrowetting-ondielectric (EWOD) [23]. The structure diagram of an EWOD model was shown in Figure 1.…”

Section: Principle Of Electrowetting-on-dielectricmentioning

confidence: 99%

Driving Waveform Design of Electrowetting Displays Based on a Reset Signal for Suppressing Charge Trapping Effect

Zhang

Deng

2021

Front. Phys.

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Electrowetting display (EWD) device is a new type of reflective optoelectronic equipment with paper-like display performance. Due to the oil backflow phenomenon, it is difficult for pixels to be maintained a stable aperture ratio, so the grayscale of EWDs cannot be stabilized. To reduce the oil backflow in EWDs, a driving waveform composed of a driving signal and a periodic reset signal was proposed in this paper. A direct current (DC) signal was designed as the driving signal for driving pixels. The aperture ratio of pixels was determined by the amplitude of the DC signal. The periodic reset signal was divided into a charge release phase and a driving recovery phase. During the charge release phase, the driving voltage was abruptly dropped to 0 V for a period to release trapped charges. In the driving recovery phase, the driving voltage was rapidly increased from 0 V to a maximum value. To reach the same grayscale of EWDs, the driving waveform was returned to the driving signal at the end of the driving recovery phase. Experimental results showed that the aperture ratio of EWDs was unchanged when the driving waveform was applied. However, the aperture ratio of pixels was gradually decreased with the conventional driving waveform. It was indicated that the charge trapping effect and the oil backflow phenomenon can be effectively inhibited by the proposed driving waveform. Compared with the conventional driving waveform, the speed of oil backflow was reduced by 90.4%. The results demonstrated that the proposed driving waveform is beneficial for the achievement of stable grayscale in EWDs.

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Section: Principle Of Electrowetting-on-dielectricmentioning

confidence: 99%

Driving Waveform Design of Electrowetting Displays Based on a Reset Signal for Suppressing Charge Trapping Effect

Zhang

Deng

2021

Front. Phys.

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“…Besides, the works reported in [ 56 ] moved droplets of about 10

L with a speed of 3 mm/s by applying a high DC voltage, 400 V. This very low cost device is composed of a planar array of six electrodes with silicone rubber as the dielectric layer and a commercially available water repellent as the hydrophobic layer. A similar open platform was reported in [ 57 ]; a planar array of 64 electrodes was developed. In this work, silicone oil and Parafilm M were used as a dielectric hydrophobic layer.…”

Section: Electrowetting On Dielectricmentioning

confidence: 99%

Lab-on-PCB and Flow Driving: A Critical Review

Perdigones

2021

Micromachines

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Lab-on-PCB devices have been developed for many biomedical and biochemical applications. However, much work has to be done towards commercial applications. Even so, the research on devices of this kind is rapidly increasing. The reason for this lies in the great potential of lab-on-PCB devices to provide marketable devices. This review describes the active flow driving methods for lab-on-PCB devices, while commenting on their main characteristics. Among others, the methods described are the typical external impulsion devices, that is, syringe or peristaltic pumps; pressurized microchambers for precise displacement of liquid samples; electrowetting on dielectrics; and electroosmotic and phase-change-based flow driving, to name a few. In general, there is not a perfect method because all of them have drawbacks. The main problems with regard to marketable devices are the complex fabrication processes, the integration of many materials, the sealing process, and the use of many facilities for the PCB-chips. The larger the numbers of integrated sensors and actuators in the PCB-chip, the more complex the fabrication. In addition, the flow driving-integrated devices increase that difficulty. Moreover, the biological applications are demanding. They require transparency, biocompatibility, and specific ambient conditions. All the problems have to be solved when trying to reach repetitiveness and reliability, for both the fabrication process and the working of the lab-on-PCB, including the flow driving system.

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“…It is also the inconsistency between the advancing contact angle and the receding contact angle (oil contracting and spreading) of a droplet. As shown in Figure 3, θ A is the advancing contact angle, θ R is the receding contact angle [20].…”

Section: Principle Of Hysteresismentioning

confidence: 99%

A Multi Waveform Adaptive Driving Scheme for Reducing Hysteresis Effect of Electrowetting Displays

Wang

Henzen

2020

Front. Phys.

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Electrowetting display (EWD) is a new reflective display technology, which has the advantages of ultra-low power consumption, high contrast, fast response and full-color. However, due to a hysteresis effect, accurate gray scale display of EWDs cannot be achieved, which seriously restricted the display effect and performance of EWDs. In order to reduce the influence of hysteresis effect, a multi waveform adaptive driving scheme was proposed in this paper. Firstly, a multi waveform driving system was designed and implemented by a STM32 master chip and an AD5304 driver chip. The driving system could automatically select different driving waveforms according to the preset switching conditions. Then, different driving waveforms were designed and implemented according to different driving stages of EWDs. Finally, driving waveforms were mapped with each stage of the driving process one by one to realize the adaptive driving of multiple waveforms. The experimental results showed that, compared with the conventional square wave, the maximum hysteresis difference of hysteresis curve could be reduced by 39.19% with the multi waveform driving scheme.

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Design of an Open Electrowetting on Dielectric Device Based on Printed Circuit Board by Using a Parafilm M

Cited by 39 publications

References 24 publications

Driving Waveform Design of Electrowetting Displays Based on a Reset Signal for Suppressing Charge Trapping Effect

Driving Waveform Design of Electrowetting Displays Based on a Reset Signal for Suppressing Charge Trapping Effect

Lab-on-PCB and Flow Driving: A Critical Review

A Multi Waveform Adaptive Driving Scheme for Reducing Hysteresis Effect of Electrowetting Displays

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