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.
Highlights
Academic Editor: Luigi SirletoElectronic paper is an ultra-low energy consumption optoelectronic display technology [1,2,3,4]; it mainly includes electrowetting displays (EWDs) [5,6,7] and electrophoretic displays (EPDs) [8,9]
Red particles cannot be sufficiently eliminated when they are driven to the top of microcapsules, which leads to the appearance of red ghost images in a gray scale transformation
We proposed a new driving method based on optimizing the erasing and activation stages for three-color EPDs
Summary
Electronic paper is an ultra-low energy consumption optoelectronic display technology [1,2,3,4]; it mainly includes electrowetting displays (EWDs) [5,6,7] and electrophoretic displays (EPDs) [8,9]. Some new problems have arisen in three-color EPDs. For example, red particles cannot be sufficiently eliminated when they are driven to the top of microcapsules, which leads to the appearance of red ghost images in a gray scale transformation. The design of traditional driving waveforms cannot effectively eliminate red ghost images, which reduce the accuracy of the gray scale display [14]. The existing driving methods for three-color EPDs do not consider the influence of the red particles on the gray scale display, and the problem of red ghost images has not been effectively solved. A new driving waveform was proposed for eliminating red ghost images in three-color EPDs. First, the display principle of the three-color EPDs was analyzed by using electrophoresis theory. The red ghost images were eliminated by applying a red erasing stage and a high frequency square wave in the driving waveform
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