Design of Driving Waveform Based on Overdriving Voltage for Shortening Response Time in Electrowetting Displays

Zeng, Wenjun; Yi, Zichuan; Zeng, Weibo; Ma, Simin; Zhou, Xiangyu; Feng, Haoqiang; Liu, Liming; Shui, Lingling; Zhang, Chongfu; Yang, Jianjun; Zhou, Guofu

doi:10.3389/fphy.2021.642682

Cited by 25 publications

(24 citation statements)

References 30 publications

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“…This scheme could effectively reduce the response time. Lastly, due to the response speed of the oil was increased when the driving voltage was increased, the work showed that overdriving voltage can reduce the response time [61]. The influence of different overdriving voltages on response time was tested in this work.…”

Section: Driving Waveforms For Reducing Response Timementioning

confidence: 99%

Review of Driving Waveform for Electrowetting Displays

Zhang

Zeng

et al. 2021

Front. Phys.

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Electrowetting display (EWD) is the most potential technology among new electronic paper technologies. It not only has the advantages of electrophoretic display (EPD) technology but also can realize color video playback. Therefore, this technology has been widely studied in recent years. Driving waveform is a voltage sequence which can drive pixels to display gray scales in EWDs. As one of the key technologies, it directly affects the display effect of pixels. In this paper, we give a review of the display principle of EWDs and the research status of driving waveforms. At the same time, the contact angle hysteresis, charge trapping, and oil splitting are also reviewed, which can provide a reference value for designing driving waveforms.

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Section: Driving Waveforms For Reducing Response Timementioning

confidence: 99%

Review of Driving Waveform for Electrowetting Displays

Zhang

Zeng

et al. 2021

Front. Phys.

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“…The driving waveform has influence on the movement of oil [32][33][34]. To comprehend the acceleration ability of oil with the action of driving waveforms in one cycle, these driving waveforms with a different rising slope were designed, as shown in Figure 8.…”

Section: Influence Of Driving Waveformsmentioning

confidence: 99%

Driving Waveform Optimization by Simulation and Numerical Analysis for Suppressing Oil-Splitting in Electrowetting Displays

2021

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Electrowetting display (EWD) is a new reflective display device with low power consumption and fast response speed. However, the maximum aperture ratio of EWDs is confined by oil-splitting. In order to suppress oil-splitting, a two-dimensional EWD model with a switch-on and a switch-off process was established in this paper. The process of oil-splitting was obtained by applying different voltage values in this model. Then, the relationship between the oil-splitting process and the waveforms with different slopes was analyzed. Based on this relationship, a driving waveform with a narrow falling ramp, low-voltage maintenance, and a rising ramp was proposed on the basis of square waveform. The proposed narrow falling ramp drove the oil to rupture on one side. The low-voltage maintenance stage drove the oil to shrink with a whole block. The proposed rising ramp was pushed the oil into a corner quickly. The experimental results showed that the oil splitting can be suppressed effectively by applying the proposed driving waveform. The aperture ratio of the proposed driving waveform was 2.9% higher than that of the square waveform with the same voltage.

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“…But the response time of EWDs was limited. Lately, Zeng [18] introduced a 4 ms overdriving stage at 32 V to improve the response speed of EWDs, but the situation of much higher overdriving voltages had not been studied. In addition, it did not give a general method to design a waveform, and the proposed waveform was only limited to the EWD used in its verification.…”

Section: Figure 3 |mentioning

confidence: 99%

Design Method of Equivalent Driving Waveform Based on Electrowetting Response Characteristics

Tian

2021

Front. Phys.

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As a new reflective display technology, electrowetting displays (EWDs) have many important characteristics, such as high reflectivity, low power consumption, and paper-like display. However, the contact angle hysteresis, which is the inconsistency between the advancing contact angle and the receding contact angle of oil droplet movement, seriously affects the response speed of EWDs in the driving process. According to the hysteresis phenomenon of contact angle in an oil switch motion with the action of interface tension, the brightness curve of EWDs in the process of pixel switching by different driving voltages was tested in this paper, and driving voltage was changed from 30 to 100 V at the same time. Then, in order to reduce the influence of the hysteresis effect, an equivalent driving waveform design method with overdriving voltage was proposed, and the overvoltage was set to 100 V according to the hysteresis effect and driving characteristic of EWDs. Experimental results showed that the response rising time of EWDs was reduced to 21 ms by using the proposed driving waveform, and the response performance of EWDs can be effectively improved.

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Design of Driving Waveform Based on Overdriving Voltage for Shortening Response Time in Electrowetting Displays

Cited by 25 publications

References 30 publications

Review of Driving Waveform for Electrowetting Displays

Review of Driving Waveform for Electrowetting Displays

Driving Waveform Optimization by Simulation and Numerical Analysis for Suppressing Oil-Splitting in Electrowetting Displays

Design Method of Equivalent Driving Waveform Based on Electrowetting Response Characteristics

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