Philips 221T1SB/05 User Manual

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Note
A red or blue bright dot must be more than 50 
percent brighter than neighboring dots while 
a green bright dot is 30 percent brighter than 
neighboring dots.
Black Dot Defects Black dot defects appear as 
pixels or sub pixels that are always dark or 'off'. 
That is, a dark dot is a sub-pixel that stands 
out on the screen when the monitor displays a 
light pattern. These are the types of black dot 
defects:
Proximity of Pixel Defects 
Because pixel and sub pixels defects of the 
same type that are near to one another may be 
more noticeable, Philips also specifies tolerances 
for the proximity of pixel defects.
Pixel Defect Tolerances
In order to qualify for repair or replacement 
due to pixel defects during the warranty period, 
a TFT LCD panel in a Philips flat panel monitor 
must have pixel or sub pixel defects exceeding 
the tolerances listed in the following tables.
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. There are the 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)