电润湿电子纸迟滞特性的灰度失真校正方法  

Grayscale Distortion Correction Method for Hysteresis Characteristics of Electrowetting Display

作　　者：谢子昱 梅婷 林珊玲 蔡苾芃 陈明真 林志贤[1,2,3] XIE Ziyu;MEI Ting;LIN Shanling;CAI Bipeng;CHEN Mingzhen;LIN Zhixian(College of Physics and Information Engineering,Fuzhou University,Fuzhou 350116,China;Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350116,China;Scholol of Advanced Manufacturing,Fuzhou University,Quanzhou 362200,China)

机构地区：[1]福州大学物理与信息工程学院,福州350116 [2]中国福建光电信息科学与技术创新实验室,福州350116 [3]福州大学先进制造学院,泉州362200

出　　处：《光子学报》2024年第7期194-203,共10页Acta Photonica Sinica

基　　金：国家重点研发计划(No.2021YFB3600603);福建省自然科学基金(No.2020J01468)。

摘　　要：针对电润湿电子纸受迟滞特性影响,在电压上升阶段与电压下降阶段,同一驱动电压所显示亮度不同的现象,提出一种电润湿电子纸迟滞特性的灰度失真校正方法。该方法首先测量不同电压区间下,迟滞特性对光电曲线的影响,并拟合测量数据,建立电润湿电子纸迟滞特性曲线模型,构建不同场景下同一灰阶的驱动电压映射关系,最后达到减小亮度差异的效果,以减小灰度失真。实验结果表明,该方案有效减小失真程度,灰阶相对亮度差值最高从20.07%减少至0.01%,减少比例为99.93%;相对亮度差值平均减少10.84%,减少比例为80.98%;油墨开口率失真程度最高从5.67%降低至0.13%,降低比例为97.7%。Electrowetting Display(EWD)not only has the advantages of ultra-low power consumption,can reading under strong light,paper-like reading experience,but also has the advantages of high response speed and video playback that Electronic Paper Displays(EPD)does not have.However,problems such as oil splitting,oil backflow,charge trapping,hysteresis effect,hinder the development of EWD.Hysteresis is an important reason for the gray distortion of EWD.Aiming at the phenomenon that the luminance displayed by the same driving voltage is different in the voltage rise stage and the voltage drop stage due to the hysteresis characteristics of EWD,this paper proposes a gray distortion correction method for the hysteresis characteristics of electrowetting display.Firstly,we designed and built a test platform.The test platform is used to measure the change of EWD aperture ratio under different voltages.The test platform consists of a microscope(with a high-speed CCD camera),a function generator,a power amplifier,and a PC.At the same time,we developed a program to measure the aperture ratio with Labview,which was run on PC.Part of the function of the program is to output test voltage.This function uses PC as the master computer and function generator as the slave computer,and uses SPCI to communicate between them.The output voltage of the function generator is amplified by the power amplifier and then applied to the EWD.The second part of the program is to detect the degree of ink shrinkage.This function uses PC as the master computer and microscope with camera as the slave computer.When the voltage is applied to the EWD,the ink begins to shrink,and the camera collects the ink status in the form of image data and sends it back to the master computer.The last part of the program is to calculate the aperture ratio with Matlab.After the image data is collected and transmitted to Matlab,the image is processed by using the program we wrote in advance in Matlab.The corresponding aperture ratio at that applied voltage will be calculated a

关 键 词：迟滞现象 电润湿电子纸 灰度等级 驱动方式 电压调制 

分 类 号：TP27[自动化与计算机技术—检测技术与自动化装置]