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How many dead LCD pixels are OK on a screen?
Posted by: Jim_ on: 07/22/2004 01:43 PM [ Print | 5 comment(s) ]
This is always an interesting debate. How many dead pixels are "satisfactory" on an LCD? Most of us would say none, but what do the manufacturers think?
TOSHIBA EUROPE has a warning on a page advertising its Satellite M30-901 notebook, which says that "small bright spots" which may appear on notebook screens are things you have to live with. These are defective pixels, and Toshiba is right to point out that it's inevitable some elements in high tech screens fail. But, as Pete Gamby, senior display analyst at Meko UK says, when you've a dead pixel or two and they're in the middle of the screen when you switch on, they ain't half annoying.They go through the different classifications of pixel faults over at The Inquirer.
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Occupant Registered User Posts: 2421 Joined: 2002-03-04 |
#30780 Posted on: 07/22/2004 09:24 PM
I had to deal with sony about this. (a while ago) They said thier standard was 3 within a 2 inch square, was unacceptable... But this was a flexable policy, if the customer was dissatisifed, they'd grant an RMA to make the customer happy. |
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duraid SMP Qualified Posts: 387 Joined: 2002-03-31 |
#30781 Posted on: 07/23/2004 02:36 AM
I think it's OK to have a dead pixel or two only if you can't actually see them. Unfortunately, means that for most LCDs on the market, there shouldn't be ANY dead pixels. But on high-resolution panels like the IBM T221, a single dead pixel (dark) isn't really a problem because you just can't see it unless you start getting a bit too close to the panel. Hopefully, one day we'll all be buying 600dpi LCD screens, and I don't think anyone would complain if there were 5 or 10 dead pixels scattered here and there... |
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glitch Registered User Posts: 1173 Joined: 2000-11-18 |
#30782 Posted on: 07/23/2004 01:39 PM
Definitely not the case where 2 is better than 1. I'd say zero is an okay number for dead pixels. Otherwise, they should list the resolution as being 1600x1200 - 7 or whatever is appropriate. Or perhaps 1600x1200-n, where n is a random variable with some well described distribution. |
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JohNEE <font color="#E22000"><b>News Monkey</b></font> Posts: 361 Joined: 2000-05-10 |
#30783 Posted on: 07/23/2004 01:54 PM
This is something I deal with regularly with a dozen plus notebook manufacturers and similar numbers of LCD makers. Overall the number of screens with dead pixels is very small - you are quite unlucky if in this situation. They all have a different 'rule of thumb' to decide whether a screen is faulty but none will guarantee zero dead pixels. This is due to the fact that the actual panel makers only currently make to ISO Class 2 standard and not Class 1 (no dead pixels). However most screen/notebook manufacturers will swap a unit if it has dead pixels out of the box - probably because in most countries, consumer law allows a limited period (28days in UK) for return and full refund no questions asked after product purchase. J. The Toaster Dual PIII 800E, T100, Win2k, 512MB Crucial, 2940U2W + 2x 18.4 Gb 10k II's, GF2 Ultra, TBSC, Pioneer DVD-ROM, Plextor 24/10/40A, 3com NIC - in a modded Aopen HX08. |
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UKWolf SMP Wannabie Posts: 430 Joined: 2001-06-28 |
#30784 Posted on: 07/23/2004 04:14 PM
Neat idea 
Aceptable numbers and distribution is where the debate will be - agree with zero, but as resolutions increse them this will be less relavent as duraid states :cool: "It's unwise ... |