scholarly journals Design Method of Equivalent Driving Waveform Based on Electrowetting Response Characteristics

2021 ◽  
Vol 9 ◽  
Author(s):  
Lixia Tian ◽  
Hao Li
Keyword(s):  
Contact Angle ◽  
Design Method ◽  
Contact Angle Hysteresis ◽  
Response Speed ◽  
Hysteresis Effect ◽  
Hysteresis Phenomenon ◽  
Driving Voltage ◽  
Interface Tension ◽  
Response Characteristics ◽  
Driving Waveform

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.

scholarly journals Aperture Ratio Improvement by Optimizing the Voltage Slope and Reverse Pulse in the Driving Waveform for Electrowetting Displays

Micromachines ◽  
2019 ◽  
Vol 10 (12) ◽  
pp. 862 ◽  
Author(s):  
Zichuan Yi ◽  
Wenyong Feng ◽  
Li Wang ◽  
Liming Liu ◽  
Yue Lin ◽  
...  
Keyword(s):  
Inflection Point ◽  
Charge Trapping ◽  
Response Speed ◽  
Driving Voltage ◽  
Hysteresis Characteristic ◽  
Aperture Ratio ◽  
Dynamic Display ◽  
Capacitance Voltage ◽  
Reverse Pulse ◽  
Driving Waveform

Electrowetting display (EWD) performance is severely affected by ink distribution and charge trapping in pixel cells. Therefore, a multi structural driving waveform is proposed for improving the aperture ratio of EWDs. In this paper, the hysteresis characteristic (capacitance–voltage, C-V) curve of the EWD pixel is tested and analyzed for obtaining the driving voltage value at the inflection point of the driving waveform. In the composition of driving waveform, a voltage slope is designed for preventing ink dispersion and a reverse pulse is designed for releasing the trapped charge which is caused by hysteresis characteristic. Finally, the frequency and the duty cycle of the driving waveform are optimized for the max aperture ratio by a series of testing. The experimental results show that the proposed driving waveform can improve the ink dispersion behavior, and the aperture ratio of the EWD is about 8% higher than the conventional driving waveform. At the same time, the response speed of the driving waveform can satisfy the dynamic display in EWDs, which provides a new idea for the design of the EWD driving scheme.

Effect of Contact Angle Hysteresis on Liquid Bridge while Sphere Particles are in Relative Movement

2013 ◽  
Vol 634-638 ◽  
pp. 2945-2948
Author(s):  
Song Yang ◽  
Jun Hua Wu ◽  
Xin Wang
Keyword(s):  
Contact Angle ◽  
Liquid Bridge ◽  
Capillary Force ◽  
Contact Angle Hysteresis ◽  
Capillary Forces ◽  
Hysteresis Effect ◽  
Liquid Volume ◽  
Liquid Bridges ◽  
Relative Movement ◽  
Important Impact

Hysteresis effect of contact angle has an important impact on liquid bridges between sphere particles. This effect is not limited to increasing liquid volume of fixed particles. The hysteresis effect of contact angle is expressed by fixed liquid volume while the two sphere particles are in relative movement. The hysteresis effect of contact angle on the liquid bridge is also significant. In this paper, the hysteresis effect of contact angle on capillary forces of liquid bridges is analyzed when the two sphere particles are in relative movement. Results indicate that contact angle hysteresis effects on capillary force are significant.

scholarly journals Review of Driving Waveform for Electrowetting Displays

2021 ◽  
Vol 9 ◽  
Author(s):  
Zichuan Yi ◽  
Hu Zhang ◽  
Wenjun Zeng ◽  
Haoqiang Feng ◽  
Zhengxing Long ◽  
...  
Keyword(s):  
Contact Angle ◽  
Contact Angle Hysteresis ◽  
Reference Value ◽  
Charge Trapping ◽  
Video Playback ◽  
Research Status ◽  
Key Technologies ◽  
Electrophoretic Display ◽  
Color Video ◽  
Driving Waveform

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.

The experimental analysis on the driving characteristics of photo response torsion actuator

2020 ◽  
Vol 31 (12) ◽  
pp. 1455-1464
Author(s):  
Yafeng Liu ◽  
Xinjie Wang ◽  
Jiong Wang ◽  
Hejuan Chen ◽  
Jiahan Huang
Keyword(s):  
Lead Zirconate Titanate ◽  
Response Speed ◽  
Lead Zirconate ◽  
Rapid Response ◽  
Hysteresis Phenomenon ◽  
Driving Voltage ◽  
Zirconate Titanate ◽  
Photo Response ◽  
Lead Zirconate Titanate Ceramic ◽  
Titanate Ceramic

The lanthanum-doped lead zirconate titanate ceramic is a well-known photostrictive material and has been studied extensively as wireless photo-controlled microactuators for its characteristic of photostrictive effect. However, the hysteresis phenomenon between photovoltage and photo-induced deformation has seriously hindered the application of the high-frequency dynamic field. The primary purpose of this article is to propose a photo response torsion actuator driven by opto-electrostatic hybrid driving method based on lanthanum-doped lead zirconate titanate ceramic to achieve the goal of rapid response regardless of the hysteresis phenomenon. To this end, this study observed the driving voltage, the relationship between the photovoltaic voltage of lanthanum-doped lead zirconate titanate ceramic and the deflection of the actuator, and the influence of different loads on driving characteristics through a series of experiments. From these experiments, the results indicate that when lanthanum-doped lead zirconate titanate ceramic is irradiated by ultraviolet light, the photovoltaic voltage with load is lower than that without load. The trend of deformation curves is in agreement with the trend of the driving voltage curves under different loads conditions. And the deformation of torsion actuator increases with the increase in light intensity. Therefore, the photo response torsion actuator driven by the opto-electrostatic hybrid driving method can control the deformation with rapid response speed effectively; meanwhile, the hysteresis phenomenon can be ignored.

Hydrodynamics and mechanism of hydrophobic foam column tray: Contact angle hysteresis effect

AIChE Journal ◽  
2019 ◽  
Vol 66 (1) ◽  
Author(s):  
Peng Yan ◽  
Xingang Li ◽  
Hong Li ◽  
Yuanyuan Shao ◽  
Hui Zhang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Contact Angle Hysteresis ◽  
Hysteresis Effect

A NEW APPROACH TO INVESTIGATE CONTACT ANGLE HYSTERESIS

2018 ◽  
Author(s):  
Qiao Liu ◽  
Abbasali Abouei Mehrizi ◽  
Hao Wang
Keyword(s):  
Contact Angle ◽  
Contact Angle Hysteresis ◽  
New Approach

Drop impact on solids: contact-angle hysteresis filters impact energy into modal vibrations

2021 ◽  
Vol 923 ◽  
Author(s):  
Vanessa R. Kern ◽  
Joshua B. Bostwick ◽  
Paul H. Steen
Keyword(s):  
Contact Angle ◽  
Impact Energy ◽  
Contact Angle Hysteresis ◽  
Drop Impact

Abstract

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