Encapsulation of modified pigment yellow 110 (PY110) for electrophoretic display
- PDF / 469,580 Bytes
- 7 Pages / 584.957 x 782.986 pts Page_size
- 83 Downloads / 151 Views
mprove the lower contrast ratio of yellow-white dual color electrophoretic display cell, dispersion polymerization, and miniemulsion polymerization method were used to obtain good performance of Pigment Yellow 110 (PY110) composite particles. Crude PY110 particles and Span80 were suspended into the ethanol by dispersion method to obtain PY110-S, which were subsequently coated with styrene (St) through a mini-emulsion polymerization procedure to acquire PS/PY110-S as an electronic ink material. The modified pigments were characterized by Fourier transform infrared spectroscopy (FTIR), Scanning electron microscope (SEM), UV–vis spectroscopy. Furthermore, the Pigment Red 146 which coated with styrene (St) through a miniemulsion polymerization procedure was doped into the PS/PY110-S. Then, the obtained mixed particles were successfully incorporated in an electrophoretic display cell. And the contrast ratio of yellow-white electrophoretic display cell was significantly improved. The contrast ratio reached 1.58.
I. INTRODUCTION
Recently, electronic papers have attracted a great deal of interest for use in information displays due to their distinctive advantages over the conventional paper, such as low power consumption, memorization, portability, and reliability to replace conventional papers.1–3 Electronic paper technology research mainly divided into electrophoretic display (EPD), cholesterol liquid crystal technology (CLCD), electricity wet technology, color powders display, and microelectromechanical (MEMS), etc. Among the various approaches in the electronic display technology, in-plane electrophoretic particle displays and microencapsulated electrophoretic particle displays (EPDs) offered the advantage of lower manufacturing cost, since they could be fabricated by a roll-to-roll method. EPD showed images by the movement of charged dispersed particles in the dielectric medium when a suitable voltage was applied.4–7 In both case, the chargeability of the particles was a key factor in determining the speed or efficiency of the EPDs. Thus, the properties of electrophoretic particles would be the important factor determining the image quality. Enhancement of image quality required very small particle sizes which had a narrow size
Contributing Editor: Winston V. Schoenfeld a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2016.244
distribution and higher surface charge of particles for precise image control and faster response to the driving applied voltage.8 Furthermore, the composite particles based on organic pigments were believed to be more suitable for the fabrication of EPD for their superior merits, such as high light stability, excellent chemical durability, the intense optical absorption, and wide varieties.9,10 In recent years, a lot of efforts have been made to study organic pigments. For example, Fu 11 encapsulated a nano-scaled azo Pigment Yellow 13 (PY13) with poly(styrene-maleic acid) (PSMA) by free-radical precipitation polymerization, getting satisfactory particles
Data Loading...
