TFT Monitor - failure rate

[ando57]

Hello,

Could anybody please advise what the average failure rate of TFT monitors is?

We are DOAing a number of the HP f1703 TFT's due to faulty pixels.

All the monitors being replaced fall outside of HPs white paper on defect standards.

Any information on average % failure rate of TFT monitors would be fantastic.

Best regards,

Jeff

 

[Lemon13]

afik there is no standard, every company does its own thing, depending on what failure (black/withe) and where it is(sides/middle...).

from

http://www.arnnet.com.au/index.php?id=1726065920

"Pixel failure The most visually disturbing occurrence in TFTs, and the least talked about, according to Hess, is pixel failure. This comes in two varieties: bright dots and black dots. The first is when the red, green, blue (RGB) sub-pixel stays constantly on; the second is when the sub-pixel simply dies altogether. Bright dots are very noticeable, Lewis says, and customers will often return a display even though they may have purchased it for half price in the knowledge that it was faulty. Black dots are less noticeable and manufacturers will tolerate a various number of these, depending on their own quality control and the price of the screen. Colloquially, TFT LCDs are separated into A-grade and B-grade batches, although within these generic grades there are up to eight different variants of quality, all relating to the number of pixel failures on the panel. Detailing what each variant actually means is difficult because there is no established standard. Hess says Mitsubishi/NEC has created a quasi-standard that most industry participants have adopted. Meanwhile, Samsung says it complies with the Australian Standards criteria, ISO 13406. No manufacturer can guarantee zero pixel failure on both black and bright dots, although Philips does offer a zero bright dot guarantee. Serra anticipates that by 2003 just about every monitor manufacturer will be trumpeting quality assurance ratios in an effort to create a unique selling point (USP). At the same time, Matt Dalton, marketing development manager of transactional desktops and monitors for HP Australia/NZ, says it's not beyond vendors to disseminate misinformation, for example by outlining specs that relate to CRT monitors but have no bearing on the performance of TFT LCD displays, like dot pitch."

 

[ando57]

Thanks for your comments.

Regards,


Jeff