Hi,
How do dead pixels occur in LCD projectors?
And how can you reduce the risks of them happening?
And if they do happen, what can I do and how much will it cost to fix the dead pixels?
Thanks!!
Dead pixels are a manufacturing defect. Given there are about 2.7 million pixels in the subject projector’s 3 LCD panels a few defects are not uncommon. The Panasonic spec sheet (1st link) states several are normal. That said, if they are at the edge of the image they will be a lot less bothersome than in the centre … and you may not have any.
There are reports of ways to free "stuck" pixels on LCD screens, but I don’t expect these would work for a projector (and probably invalidate the warranty) since the LCD size is so small and hidden inside the projector housing).
Most manufacturers define what they consider to be a maximum tollerance for dead pixels. The first link provides a test for computer monitors that MAY be applicable if you connect a computer to the projector.
There is also an ISO standard (see last link). But this is only applicable if the manufacturer claims to meet it.
The best approach is to verify before buying what the manufacturuers policy is re dead pixels. Also you MAY be able to get further assurance from the store that sells the projector … or even purchase "dead pixel" insurance.
September 4th, 2009 at 3:08 am
you mast use lcd better
References :
September 4th, 2009 at 3:30 am
Dead pixels are the result of flaws in the glass sheets that go into displays. Inevitable glitches in the manufacturing process mean that some pixels don’t illuminate properly — or at all.
References :
cnet.com
September 4th, 2009 at 3:38 am
I hate to say it but its best when you get an lcd to get a warranty.
References :
September 4th, 2009 at 4:25 am
Dead pixels are a manufacturing defect. Given there are about 2.7 million pixels in the subject projector’s 3 LCD panels a few defects are not uncommon. The Panasonic spec sheet (1st link) states several are normal. That said, if they are at the edge of the image they will be a lot less bothersome than in the centre … and you may not have any.
There are reports of ways to free "stuck" pixels on LCD screens, but I don’t expect these would work for a projector (and probably invalidate the warranty) since the LCD size is so small and hidden inside the projector housing).
Most manufacturers define what they consider to be a maximum tollerance for dead pixels. The first link provides a test for computer monitors that MAY be applicable if you connect a computer to the projector.
There is also an ISO standard (see last link). But this is only applicable if the manufacturer claims to meet it.
The best approach is to verify before buying what the manufacturuers policy is re dead pixels. Also you MAY be able to get further assurance from the store that sells the projector … or even purchase "dead pixel" insurance.
References :
http://www.lebanon-guide.com/cgi-bin/cgt/nph-proxy.cgi/000110A/http/www.projectorcentral.com/pdf/projector_spec_3432.pdf
http://www.gdargaud.net/Hack/DeadPixels.html
http://www.tomshardware.com/2003/03/19/penalty/index.html