Electro-Optic Response Characteristics of a Dual Particle Electrophoretic Display System

Abstract

Electrophoretic nanoparticles of polystyrene (PS)-encapsulated red pigments were prepared by an emulsifier-free in-situ emulsion polymerization method and the zeta potential of the red nanoparticles was þ190 mV. We demonstrated a dual particle electrophoretic display (DPEPD) system with red and white contrast using the positively charged PS-encapsulated red pigment particles and the negatively charged white particles of rutile titanium dioxide. The scattering light intensity ratio of the white and red images was $1.7 but we could clearly observe the reversible color change between red and white when the polarity of the applied electric field was switched. 4 The turn-on and turn-off response times of the device were measured to be $750 and $650 ms, respectively, when þ1.4 and À1.4 V=lm DC field were alternately applied to the front electrode.

Synthesis and Characterization of Surface Modified Red Pigment 48:2 for Electrophoretic Display

“…To improve the contrast ratio of electrophoretic display, the dual-particles electrophoretic system was introduced for the development of colorful EPDs [4,5]. Thus, many of studies focus on the improvement of the property of the color electrophoretic particles.…”

Electrokinetic transport and manipulation of particles in confined microfluidic domains

“…However, with the particles movement, the DEP force drops sharply along the "AO" dashline and the effect is 111 much weakened near the regions of "O" because both the intensity and gradient of the local electric field are low. The response time of the proposed electronic paper display, which is defined as the time required for a 90% change in the transmittance after the electric field is applied (Ahn et al 2008), is then estimated. It is suggested that the electronic paper display with design I electrodes configuration has a response time about 850 ms. Figure 5.11 shows the effect of electrodes configurations on transmittance of the electronic paper display.…”