Research on Electrophoretic Display Ink and Its Microencapsulation
Herein, the benzidine yellow PY14 (background color) and the red metal complex dye (developing particles) are dispersed in a mixed solvent of tetrachloroethylene and xylene without adding a charge control agent to prepare an electrophoresis liquid. The electrophoresis liquid is coated into microcapsules by a complex coacervation method, and the capsule wall material is gelatin and gum arabic. Observe the morphology of the microcapsules, test the reflection density, particle size distribution and test the performance index. Finally, an electrophoretic display principle device was fabricated using indium tin oxide (ITO) conductive glass. The results showed that when the particle size of benzidine yellow was dispersed to 1400 nm and the dispersion time was 120 min, the reflection density was the highest, which was the most favorable for display. The coated microcapsules were made into electronic devices and then electrophoresed structure of the cross-linked sample was better.
KeywordsBenzidine yellow Reflection density Particle size distribution Microcapsule Complex coacervation
This work was supported by the Youth Projects of National Natural Science of China (Grant No. 21706016), the Key Project of Beijing Institute of Graphic Communication (Ea201603), the Talent Project of Beijing Institute of Graphic Communication, the Beijing Municipal Education Commission (No. SQKM201710015005).
- 1.Comisky, B., & Albert, J. D., Yoshizawa, H., et al. (1998). An electrophoretic ink for all-printed reflective electronic displays. Nature, 394(6690), 253–255.Google Scholar
- 2.Bridgestone Corp. (2003). Electrostatic liquid crystal display device for e.g. Mobile telephone, has powder fluid formed between ball-shaped spacer having adhesive agent, arranged at periphery portions of substrate. JP2003322883-A.Google Scholar
- 3.Lee, N. S., & Choi, W. S. (2004). Development of 3+2 dynamic drive scheme for cholesteric liquid crystal displays. Display, 25(5), 201–205.Google Scholar
- 4.Jianxin, G., & Haicheng, G. (2000). High performance transmissive bistable twisted nematic liquid crystal display. Modern Display, 3, 23–24.Google Scholar
- 5.Song J., Chen, L., Li, X. (2001). Microencapsulation technology and application (1), 25–29.Google Scholar
- 6.Whitesides, T. H., Zhou, Q. Y., & Wilcox, R. J. (2007). Electrophoretic media and processes for the production thereof. US 230750.Google Scholar
- 7.Li, L. (2003). Investigation on composition and properties of microencapsulated electrophoretic display ink, 63.Google Scholar