how many dead pixels on an LCD is too much

[Jetfire]

Hi everyone,

I picked up a new Compaq 17" TFT last night, initial use and observations showed no dead pixels, but after about 6 hours of fun and games, it developed two dead pixels.. one around 1/4 way down in the middle of the screen, another about 2" above and to the left of it..

When whatever is being looked at is a light color, white, grey, etc, they don't show, but when the background changes to a darker color, the dead pixels show up as red dots..

I know on my Nikon 995 camera that dead pixels on the CCD are classified as non-issue, but with dead pixels showing up on the final picture, anywhere less than 4 is considered "normal" by the manufacturer..

On LCD's, with what severity and number will the manufacturer replace the unit?

Thanks,

 

[OverDose]

Call Compaq, every manufacturer has a different policy

 

[kendogg]

that sux, getting dead pixels after 6 hours of use on a new LCD...

You should go back to the place of purchase and ask for a replacement.. if thats not possible call the manufacturer.

 

[Agamar]

I think the "acceptable" for the entire screen is ~12...unless they are bunched in one location, where I think it is 4.

 

[Dark4ng3l]

IMO 1

 

[The_Lurker]

To me, one dead pixel is too much. I've heard a lotta dead pixel problems (a few friends bought LCd's, each one has at least 1 dead pixeL) so i'm not going to LCd anytime soon.

 

[azkiwi]

From mwave pixel guidelines:

Each LCD Manufacturer is committed to customer satisfaction by providing the highest quality products in the industry. The result is that our LCD displays generally have very few non-performing pixels. For example, an 18" SXGA (1280 x 1024) display has nearly 4 million sub-pixels. A product exhibiting 10 non-performing pixels would equate to an extremely small 0.00025 percent of the total sub-pixels.

(1280 Horizontal Pixels) * (1024 Vertical Pixels) * (3 sub-pixels per pixel) = 3,932,160 sub-pixels

[(10 non-performing pixels) / (3,932,160 sub-pixels)] * 100% = 0.00025%

To ensure the highest performing displays, the manufacturer sets limits as to the allowable number of pixel anomalies. The manufacturer has adopted the following pixel criteria to supplement our existing limited warranty. This policy applies to all the manufacturer LCD displays during the warranty period.

The manufacturer sets limits on 14" - 15" LCD?s at 5 bright sub-pixels, 5 dark sub-pixels, or a combination of 8.
The manufacturer sets limits on 17" - 18" LCD?s at 8 bright sub-pixels, 8 dark sub-pixels, or a combination of 10.
the manufacturer sets limits on 20" & greater LCD?s at 10 bright sub-pixels, 10 dark sub-pixels, or a combination of 15.

*It is possible that any replacement display may also have some non-performing sub-pixels. This should be considered when requesting a warranty exchange.


Most people don't seem to be too bothered by them - they "go away" after a while, like the first scratch on a new car..

 

[Logar]

I wouldn't want any at all.

Just got a 16" Sony M-61 LCD. Haven't had a single bad pixel yet!

 

[Raspewtin]

1 is too many IMO. even 1 I find is very distracting.

 

[Zim Hosein]

Jetfire, in an ideal world, the answer would be 1, in reality, it would depend on Compaq and thier policy, OR more importantly, the return policy of the place you brought your TFT from, hope this helps.

 

[Demonicon]

I find it strange that manufacturers wouldnlt replace even with 1 bad.

 

[MrCoyote]

One pixel is too many for me too. Anyway, anyone doing any serious graphics work(CAD,animation,etc...) will probably be using a CRT. At least they should, if they knew any better. LCD's are still "new" technology, and I wouldn't buy one anytime soon. Also, for animation/video/games, they have too slow of update to be feasible for these applications. Newer LCDs are getting better, but they won't match CRTs for quite awhile.