电润湿电子纸多级灰阶研究与设计

电润湿电子纸具有功耗低、广视角、响应速度快等优点。针对其存在的灰阶显示反射率低和显示不稳定的问题，提出一种基于脉冲宽度-振幅调制驱动波形设计方法和字符分解刷新方式的电润湿灰阶改进方案。首先，基于脉冲宽度-振幅调制设计驱动波形，并利用字符分解刷新方式扫描显示屏；然后，测试每一个电压值下显示屏的开口率，并得到电润湿的迟滞特性曲线，再根据韦伯定律结合迟滞特性曲线来划分灰阶。实验结果表明，该驱动方案得到了一个最大反射率70%、显示清晰的8级灰阶电润湿显示系统。

Research and design of multi level gray scale of electrowetting electronic paper

Electrowetting electronic paper (EWD) has the characteristics of low power consumption, wide angle of view, fast response speed and so on. However, the gray scale display reflectivity is low and display instability, so an improved scheme is proposed to display gray-scale in EWDs based on a waveform design method which includes pulse width and amplitude modulation. Firstly, the design of the driving waveform based on pulse width and amplitude modulation, and char breakup refresh mode is used to scan the EWD. Secondly, the screen opening rate is test at each voltage value point, and the electrowetting hysteresis curve is obtained at the same time, then, the gray scale is divided according to weber law combined with hysteresis curve. Experimental results show that a clear 8 level gray scale EWD system with a maximum reflectivity of 70% can be achieved by the proposed driving scheme.