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Numerical simulation of the transport of particles in electrophoretic displays

100%

Bert T. , De Smet H. , Beunis F. , Strubbe F.

Opto-Electronics Review

2005

tom Vol. 13, No. 4

281-286

Electrophoretic image displays (EPIDs) are a major contestant in the search for electronic paper. Working prototypes have been demonstrated, however, full understanding of the internal physical properties is not achieved yet. In this article, we will present, for the first time, a complete set of formulae that make it possible to simulate the electrical and optical properties of EPIDs. Starting from a theoretical model, that was presented in a previous article, this article gives numerical and graphical results. The set of formulae that was used and their output helps us understand how particles are transported inside a pixel and how this leads to the electrical and optical properties of the display.

Quasistationary current contributions in electronic devices

100%

Neyts K. , Beeckman J. , Beunis F.

Opto-Electronics Review

2007

tom Vol. 15, No. 1

41-46

In an electronic device, the current supplied to the electrodes is related to different types of processes inside the device: current density, change in spontaneous polarization, and change in dielectric properties. Two expressions for the electrode current are derived: one is based on the time derivative of the Shockley-Ramo theorem, the other on the time derivative of the dielectric tensor. This result is illustrated for a switching liquid crystal device and a two-dimensional flux tube.

Monte Carlo algorithm for drift and diffusion of ions in anisotropic, non-homogeneous media

88%

Stojmenovik G. , Vermael S. , Beunis F. , Neyts K. , Verschueren A. R. M.

Opto-Electronics Review

2007

tom Vol. 15, No. 1

13-19

A new Monte Carlo algorithm for ion transport in two-dimensional anisotropic media is reported. It is based on physical considerations of drift and diffusion in anisotropic media with or without an impermeable boundary. Inhomogeneities in the medium and electric field can be taken into account by averaging along the ion trajectory. The algorithm has been appplied to the calculation of ion transport in liquid crystal displays and has been successfully compared with a finite difference program on a one-dimensional liquid crystal structure.