Abstract
The shortage of color in traditional electrophoretic displays (EPDs) can be compensated by three-color EPDs. However, the response time of black particles and white particles is increased. A new driving waveform based on the principle of three-color EPDs and electrophoresis theory was proposed to shorten the response time of black particles and white particles. The proposed driving waveform consisted of an erasing stage, an activation stage, a red driving stage, and a white or a black driving stage. The activation stage was mainly optimized in this paper. Firstly, the motion characteristics of the particles were analyzed using Stokes law and electrophoresis theory. Secondly, an optimal high frequency oscillation voltage was tested in order to improve the activity of the particles. Then, the influence of oscillation period and oscillation times on the activation stage were analyzed for optimizing the reference grayscale. According to the luminance of pixels, an oscillation period of 30 ms and an oscillation time of 30 were determined. The experimental results showed that the response time of black particles was shortened by 45%, and the response time of white particles was shortened by 40% compared with a traditional driving waveform.
Highlights
As a kind of reflective display, electrophoretic displays (EPDs) has the advantages of paper-like display characteristics, a light weight, and an extremely low power consumption [1,2,3,4,5]
The performance of three-color EPDs can be obtained by testing luminance and response time
The testing system consisted of a computer and a colorimeter (Arges-45, Admesy, Ittervoort, The Netherlands), which were used to collect and record experimental data, and a three-color EPD was used as an experimental object
Summary
As a kind of reflective display, EPD has the advantages of paper-like display characteristics, a light weight, and an extremely low power consumption [1,2,3,4,5]. The duration of the activation stage was effectively reduced by this method, but it did not nanoparticles and silica coated with ionic liquid polymer nanoparticles were proposed to follow the rule of DC balance, which can cause damage to EPDs [26,27]. The response toreduced reduce the black particles and white response time in threetime canIn be order effectively by optimizing the grayscale conversion path [11].particles. PocolortheEPDs, motion characteristics particles analyzed by using Stokes law and rous silica nanoparticles and silica coated with ionic liquid polymer nanoparticles were electrophoresis theory [32], the distance between particles and white particles and proposed to shorten the response time,and which improved the display effectblack and provided aanew idea for optimizing. Three-color EPDs can display different colors by applying different voltage sequences
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