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In-Plane Switching (IPS) Mode
In the planar cell, when a voltage is
applied the molecules lie perpendicular to the alignment layers. As
a result of viewing the molecules end on, the transmittance is very
sensitive to viewing angle. The IPS mode is becoming more common in
display applications, where interdigitated electrodes promote lateral
switching of the director. Since the molecules are viewed side on,
the transmittance is much less sensitive to viewing angle.
 
Fig.1: Director stack plot
and equi-potential surfaces in an IPS cell
Polarisers are normally crossed and are aligned parallel and perpendicular
to the optic axis. Maximum transmittance is achieved when the in-plane
electric field reorients the director to lie at 45 degrees to the
electrode edge. The cell thickness should be that of a half-wave
plate.
Fig.1 shows the director field and the equi-potential surface at
the end of a IPS electrode. Note the formation of a defect beneath
the edge of the shorter electrode.
This page last modified
2 June, 2006
by r.james
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