A high integration electrowetting displays system based on AC driving model

Xu, Yijian; Zhan, Zhiyu; Liu, Linwei; Bai, Peng

doi:10.3389/fphy.2022.1033076

Cited by 2 publications

(2 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…EWD has numerous achievements and applications in the fields of driving waveform [ 14 , 15 ]. However, the charge trapping, contact angle hysteresis, and oil splitting affected the performance of electrowetting displays; therefore, oil backflow, screen flicker, and afterimage may occur [ 16 , 17 , 18 ]. The aperture ratio of pixels was positively correlated to applied voltages due to the Lippmann–Young equation.…”

Section: Introductionmentioning

confidence: 99%

“…The gray scale could be precisely controlled by an alternating current (AC) driving waveform based on contact angle hysteresis [ 17 ]. The AC driving waveform could effectively suppress the oil backflow and flicker, but the introduction of negative voltage increased the complexity of the circuit design [ 18 ]. Overdriving waveforms were widely applied to reduce the hysteresis effect of oil and suppress oil splitting, and achieved a good display effect [ 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Wang

Zhang

et al. 2023

Micromachines

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Wang

Zhang

et al. 2023

Micromachines

Self Cite

View full text Add to dashboard Cite

show abstract

Optimizing Bipolar Reset Waveform to Improve Grayscale Stability in Active Matrix Electrowetting Displays

Zhang,

Wang,

Liu

et al. 2024

Micromachines

View full text Add to dashboard Cite

The electrowetting display (EWD) device is a new type of electrowetting-on-dielectric (EWOD) equipment that can achieve a paper-like display effect under the control of an electric field. In this microfluidic system, the stability of grayscale can be affected by various factors, such as the physicochemical properties of the materials, the device structure, and electric field distribution. To improve the grayscale stability of active matrix electrowetting displays (AM-EWDs), the impact of different polarities of driving voltage on oil backflow was investigated in this study. Based on the driving principles of AM-EWD, an optimized inter-frame bipolar reset driving waveform was designed to overcome oil backflow. The proposed driving waveform maintained the stability of the oil state by periodically and rapidly releasing trapped charges in the dielectric layer through a reverse driving voltage. Additionally, the effect of feed-through voltage on pixel driving voltage was eliminated by compensating for the driving voltage on a common electrode. Finally, the performance of the designed driving waveform was evaluated with a 6-inch AM-EWD driving platform. Compared to the conventional unipolar reset driving waveform, the backflow speed decreased by 2.70 a.u./s. The standard deviation of the display luminance was also reduced by 11.24 a.u. Experimental results indicated that both the oil backflow speed and the fluctuation range of luminance were effectively suppressed by the proposed driving waveform.

show abstract

A high integration electrowetting displays system based on AC driving model

Cited by 2 publications

References 33 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

Optimizing Bipolar Reset Waveform to Improve Grayscale Stability in Active Matrix Electrowetting Displays

Contact Info

Product

Resources

About