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用有机颜料汉沙黄(P.Y.3)、苏丹黑和合适的稳定剂为原料配制了一种性能稳定的电泳显示液。分析了此电泳显示液中颜料微粒的带电机理及其影响因素,研究了在改变电压方向时反射光谱与吸收光谱的变化及其原因,光谱分析结果表明体系中存在的各种吸附使显示效果受到局限,反射谱与吸收谱的变化在表征器件的显示特性时呈现出一致性,器件的反射光强和反射率在不同波长上有区域选择性,同时对比度也有区域选择性,这决定了在监测器件的响应时应选择的波长范围以及可利用的光源。兼顾灵敏性和测试信号强度的需求,选用峰值波长为470nm的蓝光二极管为光源,电泳槽的厚度为0.2mm,用荧光光谱仪监测相同周期不同幅值脉冲电压作用下颜料微粒在493nm波长处的反射光强的变化,并由示波器记录并输出反射光强随驱动电压的变化,还结合相关理论讨论了驱动电压对器件的反射光强和对比度的影响。
A stable electrophoretic display liquid was prepared from the organic pigment Hansahuang (P.Y.), Sudan black and the appropriate stabilizer. The charge mechanism and influencing factors of pigment particles in this electrophoretic display liquid were analyzed. The changes of the reflection and absorption spectra and the reasons for the changes in the voltage direction were investigated. The results of spectral analysis showed that the various adsorptions in the system affected the display effect Constraints, changes in the reflection spectrum and the absorption spectrum are consistent in characterization of the display characteristics of the device. The device’s reflected light intensity and reflectance are regioselective at different wavelengths, and the contrast is also regionally selective, The device should respond to the wavelength range that should be selected and the available light source. Considering the need of sensitivity and test signal intensity, a blue light diode with a peak wavelength of 470nm was used as the light source. The thickness of the electrophoresis tank was 0.2mm. Fluorescence spectroscopy was used to monitor the reflection of the pigment particles at a wavelength of 493nm under different amplitude pulse voltages in the same cycle The change of light intensity is recorded by the oscilloscope and the reflected light intensity changes with the driving voltage. The influence of the driving voltage on the reflected light intensity and the contrast of the device is also discussed.