An Analysis of Reflectivity and Response Time by Charge-to-Mass of Charged Particles in an Electrophoretic Display

Kim, Young-Cho

doi:10.4313/teem.2016.17.4.212

Cited by 7 publications

(4 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The driving waveform refers to a voltage sequence applied to pixels, which seriously affects the display quality of EPDs. A traditional driving waveform is composed of an erasing stage, a particle activation stage, and a target state display stage [24,25]. Changes in each stage can affect the display quality of EPDs.…”

Section: Principle Of Electrophoretic Displays (Epds)mentioning

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

View full text Add to dashboard Cite

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.

show abstract

Section: Principle Of Electrophoretic Displays (Epds)mentioning

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

View full text Add to dashboard Cite

show abstract

“…The reason for ghost images is that an original image remains in a new image display. The process of image display is completed by controlling the movement of particles, which depends on an electric field generated by driving waveforms [16]. A physical model of the electric field has been proposed, which provides theoretical guidance for driving waveform design [17].…”

Section: Introductionmentioning

confidence: 99%

Red Ghost Image Elimination Method Based on Driving Waveform Design in Three-Color Electrophoretic Displays

et al. 2022

View full text Add to dashboard Cite

Three-color electrophoretic displays (EPDs) are a new type of optoelectronic display device. However, they have the defect of red ghost images during gray scale transformation, which affects the accuracy of the gray scale display. In this paper, we proposed a new driving method for eliminating the red ghost images. A driving waveform was composed of an erasing stage, an activation stage, and a driving stage. First, the erasing stage was subdivided into a red erasing stage and an original erasing stage, the red erasing stage was used to eliminate residual red particles in the top of the microcapsules. Then, a high-frequency square wave was used as the activation stage for increasing the activity of the black and white particles. Meanwhile, the intensity of flickers could be decreased by the high-frequency square wave. Finally, the performance of the driving waveform was tested by a colorimeter. The experimental results showed that the driving waveform could effectively eliminate red ghost images by 80.43% and reduce the flicker intensity by 79.63%, compared with an existing driving waveform.

show abstract

“…In order to realize multi-color displays, three-color EPDs based on new added electrophoretic particles have been proposed [ 6 , 7 ], which enriched the color display of images and meet the demand of the commercial market for multi-color electronic papers [ 8 ]. However, red particles are hard to drive due to their large volume, which decreases the red saturation of red images [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Red Display for Three-Color Electrophoretic Displays with High Saturation via a Separation Stage between Black and Red Particles

et al. 2022

View full text Add to dashboard Cite

A three-color electrophoretic display (EPD) can solve the defect of an insufficient color display of black/white EPDs, but it is difficult to achieve a high red saturation due to the same driving polarity between black and red electrophoretic particles. In this work, a separation stage was proposed in the driving process to increase the red saturation in three-color EPDs. Firstly, red particles’ motion was analyzed by the electrophoretic theory and Stokes’ theorem to optimize driving parameters. Secondly, the activity of black particles was analyzed by testing different driving process parameters, and an optimal activation parameter for red particles was obtained. Next, the separation stage parameters were analyzed to reduce the mixing degree of black and red electrophoretic particles. Experimental results showed that the red and black electrophoretic particles could be effectively separated. Compared with an existing driving method, the red saturation was increased by 23.4%.

show abstract

An Analysis of Reflectivity and Response Time by Charge-to-Mass of Charged Particles in an Electrophoretic Display

Cited by 7 publications

References 8 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

Red Ghost Image Elimination Method Based on Driving Waveform Design in Three-Color Electrophoretic Displays

Red Display for Three-Color Electrophoretic Displays with High Saturation via a Separation Stage between Black and Red Particles

Contact Info

Product

Resources

About