3.1: <i>Invited Paper:</i> Electrowetting display: Towards full‐color video reflective display

Guo, Yuanyuan; Yuan, Dong; Bai, Peng; Li, Hao; Yi, Zichuan; Deng, Yong; Zhou, Rui; Zhong, Benpeng; Jang, Hongwei; Henzen, Alex; Zhou, Guofu

doi:10.1002/sdtp.15020

Cited by 4 publications

(3 citation statements)

References 37 publications

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“…Electrowetting display (EWD) is a new reflection display technology, boasting high contrast, ultra-low power consumption, and fast response [ 1 , 2 ]. However, the commercialization of EWD still needs to be improved, due to oil backflow problems [ 3 ], as well as gray scale consistency and other issues [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Design of Multi-DC Overdriving Waveform of Electrowetting Displays for Gray Scale Consistency

Wang

Zhang

et al. 2023

Micromachines

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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.

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Section: Introductionmentioning

confidence: 99%

Design of Multi-DC Overdriving Waveform of Electrowetting Displays for Gray Scale Consistency

Wang

Zhang

et al. 2023

Micromachines

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“…Technologies such as liquid crystal display (LCD), organic light-emitting diode (OLED), and electrophoretic paper display (EPD) provide more convenience for information interaction [ 4 , 5 ]. Compared with LCD, EWD has a higher contrast ratio in strong ambient light, and it does not need to increase power consumption to adjust brightness as LCD does [ 6 , 7 , 8 ]. The reflective display technology can further replace paper reading and contribute to low-carbon environmental protection.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Adaptive Display System for Electrowetting Displays Based on Alternating Current and Direct Current

Zhan

et al. 2022

Micromachines

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As a representative of the new reflective display technology, electrowetting display (EWD) technology can be used as a video playback display device due to its fast response characteristics. Direct current (DC) driving brings excellent reflectivity, but static images cannot be displayed continually due to charge trapping, and it can cause afterimages when playing a dynamic video due to contact angle hysteresis. Alternating current (AC) driving brings a good dynamic video refresh ability to EWDs, but that can cause flickers. In this paper, a dynamic adaptive display model based on thin film transistor-electrowetting display (TFT-EWD) was proposed. According to the displayed image content, the TFT-EWD display driver was dynamically adjusted by AC and DC driving models. A DC hybrid driving model was suitable for static image display, which could effectively suppress oil backflow and achieve static image display while ensuring high reflectivity. A source data non-polarized model (SNPM) is an AC driving model which was suitable for dynamic video display and was proposed at the same time. Compared with DC driving, it could obtain smooth display performance with a loss of about 10 absorbance units (A.U.) of reflective luminance, which could solve the flicker problem. With the DC hybrid driving model, the ability to continuously display static images could be obtained with a loss of 2 (A.U.) of luminance. Under the AC driving in SNPM, the reflected luminance was as high as 67 A.U., which was 8 A.U. higher than the source data polarized model (SPM), and it was closer to the reflected luminance under DC driving.

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“…Video information acquisition has become one of the important sources for people's daily life. The emergence of technologies such as liquid crystal displays (LCD), Organic Light-Emitting Diode (OLED), and electrophoretic paper displays (EPD) provides more convenience for information interaction [1][2][3]. In addition to the size and resolution of display devices, people have higher requirements, and reading comfort is gradually concerned.…”

Section: Introductionmentioning

confidence: 99%

A high integration electrowetting displays system based on AC driving model

Xu¹,

Zhan²,

Liu³

et al. 2022

Front. Phys.

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As a representative of new reflective display technology, the electrowetting display (EWD) has been widely accepted for its good advantages in power consumption control and display contrast. Because of charge trapping and contact angle hysteresis, static images cannot be maintained and afterimage phenomenon occurs, respectively. These problems seriously affect the EWDs display effect. In order to improve the video display effect of EWDs, an alternating current (AC) driving model was proposed in this paper. Firstly, a high integration EWDs system was built with Xilinx field programmable gate array (FPGA). Secondly, an asymmetric intermediate frequency (IF) AC driving model was proposed to eliminate the afterimage of the video. Finally, the optimized driving method was applied to the EWDs system to achieve a high-smooth display output. The experimental results showed that the problem of afterimage and the problem of static image preserving display were effectively solved. Compared with the traditional AC driving waveform, the maximum reflected luminance of the proposed method was increased by 14%, and the refresh rate of EWDs could reach 60 Hz.

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3.1: Invited Paper: Electrowetting display: Towards full‐color video reflective display

Cited by 4 publications

References 37 publications

Design of Multi-DC Overdriving Waveform of Electrowetting Displays for Gray Scale Consistency

Design of Multi-DC Overdriving Waveform of Electrowetting Displays for Gray Scale Consistency

Dynamic Adaptive Display System for Electrowetting Displays Based on Alternating Current and Direct Current

A high integration electrowetting displays system based on AC driving model

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