Title :
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
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;
Conference_Titel :
Dielectric Liquids, 2002. ICDL 2002. Proceedings of 2002 IEEE 14th International Conference on
Print_ISBN :
0-7803-7350-2
DOI :
10.1109/ICDL.2002.1022773
