Design of Driving Waveform for Shortening Red Particles Response Time in Three-Color Electrophoretic Displays.

Wenjun Zeng,Liming Liu,Guofu Zhou,Xichen Zhou,Jianjun Yang,Haoqiang Feng,Chongfu Zhang,Yiming Zhao,Zichuan Yi,Feng Chi

doi:10.3390/mi12050578

Abstract

Three-color electrophoretic displays (EPDs) have the advantages of multi-color display and low power consumption. However, their red particles have the disadvantage of long response time. In this paper, a driving waveform, which is based on electrophoresis theory and reference gray scale optimization, was proposed to shorten the response time of red particles in three-color EPDs. The driving waveform was composed of erasing stage, reference gray scale forming stage, red driving stage, and white or black driving stage. Firstly, the characteristics of particle motion were analyzed by electrophoresis theory and Stokes law. Secondly, the reference gray scale of the driving waveform was optimized to shorten the distance between red particles and a common electrode plate. Finally, an experimental platform was developed to test the performance of the driving waveform. Experimental results showed that the proposed driving waveform can shorten the response time of red particles by 65.57% and reduce the number of flickers by 66.67% compared with the traditional driving waveform.

Highlights

Three-color electrophoretic displays (EPDs) are a new type of electronic paper [1,2,3,4].They effectively make up for the limitation of traditional EPDs in the performance of multicolor display [5,6,7]
Traditional driving waveforms of three-color EPDs have the problem of a long period, which prolongs the response time of red particles [12]
The state of red particles can be expressed by the red saturation, the state of black particles and white particles can be expressed by the luminance

Summary

Introduction

Three-color electrophoretic displays (EPDs) are a new type of electronic paper [1,2,3,4]. They effectively make up for the limitation of traditional EPDs in the performance of multicolor display [5,6,7]. Certain improvements are required for commercialization of three-color EPDs, such as shortening the response time of red particles. Traditional driving waveforms of three-color EPDs have the problem of a long period, which prolongs the response time of red particles [12]. It is of great significance to shorten the response time of red particles in three-color EPDs by optimizing the driving waveform

Methods

Findings

Discussion

Conclusion