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

Abstract

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.

Editorial for the Special Issue on Advances in Optoelectronic Devices

“…In addition, a three-color EPD could be prepared by adding red particles to an EPD [ 10 ]. In order to solve the problem of red ghost images, Wang et al analyzed the spatial location distribution of red particles in grayscale transformation [ 11 ]. The key factors of red ghost images generation were investigated, and a driving waveform was proposed based on the optimization of erase and activation stages.…”