LCD profiling and polarisation
LCD profiling and polarisation
- Subject: LCD profiling and polarisation
- From: Graeme Gill <email@hidden>
- Date: Wed, 20 Oct 2004 12:00:55 +1000
- Organization: Color Technology Solutions
In checking out a couple of LCD monitors recently, we've
noticed something rather interesting with the Gretag I1 and
Spectrolino. Both instruments seem to be slightly sensitive
to the polarization of the light they receive.
A Sony LCD we've been looking at has a vertical polarization
(which means you can still see the screen if you happen to
be wearing polarized sunglasses), and it appears that both
the I1 and Spectrolino filter out a portion of the vertically
polarized light, when placed in the usual orientation on
a screen. The I1 looses about 2 delta E of brightness, while
the Spectrolino looses about 4 delta E. The instruments seem
to agree best when oriented in the usual way.
Anyone know if most LCD displays are vertically polarized ?
(The LCD instrument displays in my car are at 45 degrees).
Presumably the slight sensitivity to the polarization light
in the instruments is due to the nature of the diffraction gratings
they use. It's unclear to me whether the interaction of the
a vertically polarized LCD and the I1 and Spectrolino have been
taken into account by Gretag in using them to profile LCD displays,
or whether more accurate results would be achieved by rotating the
instruments, or whether it really makes any difference at all,
except when trying to measure absolute light levels from the screens.
Graeme Gill.
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