Driving Waveform Design of Electrowetting Displays Based on an Exponential Function for a Stable Grayscale and a Short Driving Time

Yi, Zichuan; Huang, Zhenyu; Lai, Shufa; He, Wenyao; Wang, Li; Chi, Feng; Zhang, Chongfu; Shui, Lingling; Zhou, Guofu

doi:10.3390/mi11030313

Cited by 32 publications

(33 citation statements)

References 31 publications

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“…A damping oscillation refers to the process in which the amplitude of vibration can be gradually decreased over time. As shown in Equations (6) and 7, the characteristic of a damped oscillation is that the amplitude gradually is decreased. Therefore, the intensity of the electric field applied to the pixel gets lower and lower in the driving waveform.…”

Section: Principle Of Electrophoretic Displays (Epds)mentioning

confidence: 99%

“…In recent years, electronic paper displays, which are a new type of display, have occupied a certain share in the display market due to its advantages such as large viewing angle, light in mass, low power consumption, repetitive erasing, and readability under sunlight [ 1 , 2 , 3 , 4 , 5 ]. As a kind of electronic paper display, electrophoretic displays (EPDs) have an excellent performance in the field of device manufacturing, which is expected to become one of the mainstream technologies for next-generation displays [ 6 , 7 , 8 ]. The charged particles in traditional EPDs are black electrophoretic particles with a positive charge and white electrophoretic particles with a negative charge [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

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Design of Driving Waveform Based on a Damping Oscillation for Optimizing Red Saturation in Three-Color Electrophoretic Displays

Zeng

et al. 2021

Micromachines

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At present, three-color electrophoretic displays (EPDs) have problems of dim brightness and insufficient color saturation. In this paper, a driving waveform based on a damping oscillation was proposed to optimize the red saturation in three-color EPDs. The optimized driving waveform was composed of an erasing stage, a particles activation stage, a red electrophoretic particles purification stage, and a red display stage. The driving duration was set to 360 ms, 880 ms, 400 ms, and 2400 ms, respectively. The erasing stage was used to erase the current pixel state and refresh to a black state. The particles’ activation stage was set as two cycles, and then refreshed to the black state. The red electrophoretic particles’ purification stage was a damping oscillation driving waveform. The red and black electrophoretic particles were separated by changing the magnitude and polarity of applied electric filed, so that the red electrophoretic particles were purified. The red display stage was a low positive voltage, and red electrophoretic particles were driven to the common electrode to display a red state. The experimental results showed that the maximum red saturation could reach 0.583, which was increased by 27.57% compared with the traditional driving waveform.

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Section: Principle Of Electrophoretic Displays (Epds)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of Driving Waveform Based on a Damping Oscillation for Optimizing Red Saturation in Three-Color Electrophoretic Displays

Zeng

et al. 2021

Micromachines

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“…For application of the electric signal, a proper driving waveform can not only achieve a good optical performance, but also improves the stability of the gray level [ 13 ]. The display performance refers to the image quality (e.g., reflectivity, brightness, resolution).…”

Section: Introductionmentioning

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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“…As a new optical reflective display device, electrowetting displays (EWDs) have been greatly developed. EWDs have the advantages of ultra-low power consumption, high contrast, fast response and full-color [1]. The concept of EWDs was first proposed by G. Beni [2,3].…”

Section: Introductionmentioning

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 of Electrowetting Displays Based on an Exponential Function for a Stable Grayscale and a Short Driving Time

Cited by 32 publications

References 31 publications

Design of Driving Waveform Based on a Damping Oscillation for Optimizing Red Saturation in Three-Color Electrophoretic Displays

Design of Driving Waveform Based on a Damping Oscillation for Optimizing Red Saturation in Three-Color Electrophoretic Displays

Progress in Advanced Properties of Electrowetting Displays

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

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