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Ion Transport in IPS Cells
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Ghent University
Ion migration in a liquid crystal
(LC) cell can have a significant influence on the electric field
and this in turn on the liquid crystal director orientation, even
when the ion concentration is low. On application of a voltage,
charges migrate towards the electrodes and accumulate at the alignment
layers, effectively reducing the applied potential across the cell
and therefore reducing the director tilt reached. The relaxation
time of the cell can be significantly increased due to the long
diffusion time of the ions. In some cases an image from one displayed
frame persists to the next; an effect known as image sticking. Although
the ion content of LC cells is generally low,
it tends to increase with the device age. A square wave voltage
excitation is normally applied to overcome these problems, but as
DC offsets remain; the study of this effect is important.
This page last modified
2 June, 2006
by r.james
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