Philips 191TV4L, User Manual

16

EN

Types of Pixel Defects

Pixel and sub pixel defects appear on the screen 
in different ways. There are two categories of 
pixel defects and several types of sub pixel 
defects within each category. 

Bright Dot Defects

: bright dot defects appear 

as pixels or sub pixels that are always lit or 'on'. 
That is, a bright dot is a sub-pixel that stands out 
on the screen when the monitor displays a dark 
pattern. 
These are some types of bright dot defects:

One lit red, green or blue sub pixel

Two adjacent lit sub pixels:
-  Red + Blue = Purple
-   Red + Green = Yellow
-   Green + Blue = Cyan (Light Blue)

Three adjacent lit sub pixels (one white pixel)

9  Pixel policy

Philips strives to deliver the highest quality 
products. We use some of the industry's most 
advanced manufacturing processes and practice 
stringent quality control. However, pixel or 
sub pixel defects on a flat monitor panel are 
sometimes unavoidable. No manufacturer can 
guarantee that all panels will be free from pixel 
defects, but Philips guarantees that any monitor 
with an unacceptable number of defects will be 
repaired or replaced under warranty. This notice 
explains the different types of pixel defects and 
defines acceptable defect levels for each type. 
In order to qualify for repair or replacement 
under warranty, the number of pixel defects on 
a monitor panel must exceed these acceptable 
levels. For example, no more than 0.0004% of 
the sub pixels on a monitor may be defective. 
Furthermore, Philips sets even higher quality 
standards for certain types or combinations 
of pixel defects that are more noticeable than 
others. This policy is valid worldwide.

Pixels and Sub pixels 

A pixel, or picture element, is composed of 
three sub pixels in the primary colors of red, 
green and blue. Many pixels together form an 
image. When all sub pixels of a pixel are lit, the 
three colored sub pixels together appear as a 
single white pixel. When all are dark, the three 
colored sub pixels together appear as a single 
black pixel. Other combinations of lit and dark 
sub pixels appear as single pixels of other colors.