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International Standards (iso-9241) - HP 455031-L22 - Intel Quad-Core Xeon 2.13 GHz Processor Upgrade Introduction Manual

Understanding pixel defects in tft flat panel monitors.
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Table 2. This policy applies for HP monitors manufactured in May 2009 or later:
Bright sub-pixel defects:
Dark sub-pixel defects:
Total sub-pixel defects:
Full pixel defects:
Note: the date of manufacture is on the label on the back of the HP monitor.
As a result of these tight specifications, the majority of all HP monitors are shipping
with no pixel defects at all (per HP's internal audits), and a small percentage with
only a single sub-pixel defect. Most remaining units are shipping with only a few
pixel defects that fall within the above listed range of acceptable pixel defects.

International standards (ISO-9241)

The International Standards Organization (ISO) has published its own set of
specifications for pixel defects, contained within the ISO 9241 set of standards..
These identify three classes for measuring pixel defects in flat panel monitors:
Class 0 panels are completely defect-free, including no full pixel or sub-pixel
defects.
Class 1 panels permit any or all of the following:
 1 full bright ("stuck on") pixel
 1 full dark ("stuck off") pixel
 2 single or double bright or dark sub-pixels
 3 to 5 "stuck on" or "stuck off" sub-pixels (depending on the number of
each)
Class 2 panels permit any or all of the following:
 2 full bright pixels
 2 full dark pixels
 5-10 single or double bright or dark sub-pixels (again, depending on the
number of each; no more than 5 bright ("stuck on") subpixels are
permitted).
Class 3 panels permit any or all of the following:
 5 full bright pixels
 15 full dark pixels
 50 single or double sub-pixels stuck on or off
The HP specification ensures that all of our products exceed the ISO Class 2
requirements, as no full pixel defects are ever permitted; in most cases, HP displays
will meet the more stringent Class 1 specification. As mentioned earlier, the HP
specifications dictate no full pixel defects; further, we require no double sub-pixel
2 maximum
5 maximum
5 maximum
0 allowed
6

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  • srinivas n Dec 15, 2015 12:12:
    hp lcd monitor hpl1506 NOT POWERING ON