Backflow Effect Enabling Fast Response and Low Driving Voltage of Electrophoretic E-ink Dispersion by Liquid Crystal Additives

Abstract

Electrophoretic display encountered several challenges towards high frame rate applications, such as long response time and high driving voltage. In this study, liquid crystal additive doping can simultaneously increase the response speed by 2.8 times and reduce the driving voltage to half of the initial value of electrophoretic dispersion. The backflow effect of liquid crystal, which induces an inversely electrorheological effect and facilitates the reverse micelles’ dielectrophoretic separation, was suggested to be the main reason for the performance improvement. The proposed method is facile and effective which shows promising potential for fast response and low power consumption e-paper applications.

Dynamic Modeling of Liquid Crystal-Based Metasurfaces and Its Application to Reducing Reconfigurability Times

“…2c) and the backflow effect [42], [55]- [57], which appears as a consequence of working in the high-voltage regime in thick cells and that our model did not completely capture. This is a well known phenomenon that, if one has access to the LC Leslie coefficients, either through manufacturer data or through experimental estimation [41], [58], could be included in the problem to make the model more accurate but more computationally costly. Even though this effect deteriorates the experimental measurements as the phase oscillates slightly (<65º in Fig.…”

Understanding the mechanisms of electronic ink operation

“…Our recent progress further suggested utilizing the liquid crystal molecules' flow effect to induce the charging activation and also optimized the IER effect with better switching speed. The mobility enhancement of electronic ink would be increased by a factor of 2.8 compared with the pristine ink 40 …”

Newly Discovered Dimensional Effects of Electrodes on Liquid Crystal THz Phase Shifters Enable Novel Switching Between In-plane and Out-of-Plane

“…For various values of y, the transitional response profiles for the cases of large and small y change to smoothly follow the step function of the potential, whereas those for intermediate y overshoot the target phase while exhibiting a weakly overdamped response. This behaviour is probably not due to the backflow effect [44,45] , because switching is controlled under a strong electric field, and further, the observed overdamped response is limited to only the intermediate y cases. Although this overshooting-like response should be analysed in detail, it is presumably a result of the competition between |𝐸 𝑥 | and |𝐸 𝑦 |, which are inhomogeneously distributed in the space of the unit cell.…”