Experiments and modelling of conduction and charge accumulation in liquid crystal cells

Author

Verschueren, A.R.M. ; Niessen, R.A.H. ; Notten, P.H.L. ; Oepts, W. ; Alexander-Moonen, E.M.L.

Author_Institution

Philips Res. Lab., Eindhoven, Netherlands

fYear

2002

fDate

2002

Firstpage

377

Lastpage

381

Abstract

The combination of different electrical measurements on liquid crystal (display) cells yields a consistent model for charge transport and accumulation. At small timescales (ms) the charge transport is dominated by mobile ions, but on long timescales (hrs) it is demonstrated that the (bulk) generation of extremely. low mobility ions determines the transport. These slow ions accumulate at an ionic double layer at the interface, giving rise to an electric field over the polyimide alignment layer.

Keywords

capacitance; electric impedance; electric potential; ion mobility; ion recombination; liquid crystal displays; DC current-voltage measurement; DC stress; charge accumulation; charge transport; complex capacitance; complex impedance; conduction; electric field; impedance spectroscopy; ionic double layer; liquid crystal cells; liquid crystal displays; low mobility ions; mobile ions; modelling; polyimide alignment layer; voltage drop; Active matrix liquid crystal displays; Current measurement; Dielectric constant; Electric variables measurement; Impedance measurement; Liquid crystal displays; Liquid crystals; Polyimides; Stress measurement; Voltage measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Dielectric Liquids, 2002. ICDL 2002. Proceedings of 2002 IEEE 14th International Conference on

Print_ISBN

0-7803-7350-2

Type

conf

DOI

10.1109/ICDL.2002.1022773

Filename

1022773