Philips 170C4FS/00, Service Manual, Page: 13 / 66

170C4/N4
13
Go to cover page
Definition of Pixel Defects
LCD Monitor Quality and Pixel Policy
The TFT monitor uses high-precision technology, manufactured according to HP
standards, to guarantee trouble-free performance. Nevertheless, the display
may have cosmetic imperfections that appear as small bright or dark spots. This
is common to all LCD displays used in products supplied by all vendors and is not
specific to the HP LCD. These imperfections are caused by one or more
defective pixels or sub-pixels.
1. A pixel consists of one red, one green, and one blue sub-pixel.
2. A defective whole pixel is always turned on (a bright spot on a dark
background), or it is always off (a dark spot on a bright background). The first
is the more visible of the two.3. A defective sub-pixel (dot defect) is less
3. visible than a defective whole pixel
and is small and only visible on a specific background.
The HP display does not have more than:
4. 3 bright dots.
5. 5 dark dots.
6. 5 total bright and dark dots.
7. No more than two adjacent (less than 2.5 mm edge-to-edge)
defective pixels.
To locate defective pixels, the monitor should be viewed under normal operating
conditions, in normal operating mode at a supported resolution and refresh rate,
from a distance of approximately 50 cm (16 in.).
HP expects that, over time, the industry will continue to improve its ability to
produce LCDs with fewer cosmetic imperfections And HP will adjust guidelines
as improvements are made.
http://www.wjel.net