Driving Waveform Design with Rising Gradient and Sawtooth Wave of Electrowetting Displays for Ultra-Low Power Consumption

Li, Wei; Wang, Li; Zhang, Taiyuan; Lai, Shufa; Liu, Linwei; He, Wenyao; Zhou, Guofu; Yi, Zichuan

doi:10.3390/mi11020145

Cited by 32 publications

(32 citation statements)

References 20 publications

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“…A more functional driving waveform is based on the modified PWM square waves, as shown in Figure 11 [ 24 ]. The faster rising rate results in a shorter ink rearrangement time after oil film rupture [ 25 ]. When a sharp driving waveform is applied, the oil film breaks into oil drops which move to different corners; a process called oil splitting [ 15 ].…”

Section: Electrical Driving: Optimization Of Opening Behavior and mentioning

confidence: 99%

Progress in Advanced Properties of Electrowetting Displays

Yang

Guo

et al. 2021

Micromachines

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Electrowetting display (EWD) has promising prospects in the electronic paper industry due to it having superior characteristics, such as the ability to provide a comfortable reading experience and quick response. However, in real applications, there are also problems related to dielectric deterioration, excess power consumption, optical instability and narrow color gamut etc. This paper reviewed the existing challenges and recent progress made in terms of improving the optical performance and reliability of EWD. First, the principle of electrowetting applied in small and confined configurations is introduced and the cause of the failure of the dielectric layer is analyzed. Then, the function of the pixel structures is described to avoid display defects. Next, electric signal modulations are compared in terms of achieving good image quality and optical stability. Lastly, the methods are presented for color panel realization. It was concluded that multi-layer dielectrics, three-dimensional pixel structures, proper electric frequency-and-amplitude modulation and an RGB color panel are expected to resolve the current limitations and contribute to designing advanced reflective displays.

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Section: Electrical Driving: Optimization Of Opening Behavior and mentioning

confidence: 99%

Progress in Advanced Properties of Electrowetting Displays

Yang

Guo

et al. 2021

Micromachines

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“…In order to study the effect of contact angle hysteresis on aperture ratio of EWDs, some experiments were designed in this paper. The traditional square wave was selected to drive an EWD panel, and 60 Hz was determined as the default driving frequency [3]. As shown in Figure 5, they are square waves in DC driving scheme and AC driving scheme, respectively.…”

Section: Contact Angle Hysteresis In DC Driving Scheme and Ac Drivingmentioning

confidence: 99%

“…Electrowetting display (EWD) is a new type of electronic paper display technology with excellent display characteristics: (a) reflective display, paper-like reading experience [1]; (b) response speed of several milliseconds which can meet the needs of video playback [2]; (c) paper-like reflective display mode, with low power consumption [3]; (d) high reflectivity and true color display can be implemented [4]; (e) pixel structure can be attached to flexible backplanes [5]; (f) high degree of overlap with the existing liquid crystal display (LCD) manufacturing process, which means a low manufacturing cost [6]. These advantages make EWD technology to be known as the most promising next-generation paper-like display technology.…”

Section: Introductionmentioning

confidence: 99%

Driving Scheme Optimization for Electrowetting Displays Based on Contact Angle Hysteresis to Achieve Precise Gray-Scales

Wang

Zhang

et al. 2021

Front. Phys.

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As a new display technology, electrowetting display (EWD) has many excellent display characteristics, such as paper-like, low power consumption, quick response and full color. These characteristics make EWD devices very suitable for portable devices. However, the gray-scale distortion caused by the contact angle hysteresis of EWDs seriously affects the accuracy of gray-scale display. To improve this phenomenon, the hysteresis curve of an EWD panel was studied according to the motion characteristics of advancing contact angle and receding contact angle of oil in a pixel. Then, a driving scheme for EWDs using alternating current (AC) voltage instead of direct current (DC) voltage was proposed in this paper. And the advantages and disadvantages of the driving scheme at different AC frequencies from 90 to 2,700 Hz were analyzed through experiments. According to the stability of aperture ratio in EWDs, a 470 Hz AC driving scheme was determined. Experimental results showed that the aperture ratio distortion of EWDs could be reduced from 35.82 to 5.97%, which significantly improved the display performance of pixel units.

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“…An EWD is mainly composed of glass substrate, indium tin oxides (ITO) guide electrode, hydrophobic insulation layer (HIL), pixel wall, colored oil, polar liquid, and top plate [16,17], as shown in Figure 1A. Gray scale is realized in EWDs by applying an external voltage to control the movement of the colored oil [18].…”

Section: Principles Of Electrowetting Displays Driving Principle Of Ementioning

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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Driving Waveform Design with Rising Gradient and Sawtooth Wave of Electrowetting Displays for Ultra-Low Power Consumption

Cited by 32 publications

References 20 publications

Progress in Advanced Properties of Electrowetting Displays

Progress in Advanced Properties of Electrowetting Displays

Driving Scheme Optimization for Electrowetting Displays Based on Contact Angle Hysteresis to Achieve Precise Gray-Scales

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

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