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User Manual BDL3215E / BDL4225E
41
Pixel defect 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 the PDP / TFT panels used in Plasma- & LCD- displays are sometimes
unavoidable. No manufacturer can guarantee that all panels will be free from pixel defects, but Philips guarantees that any Plasma- & LCD-
displays with an unacceptable number of defects will be repaired during the warranty period in line with your local guarantee conditions.
This notice explains the different types of pixel defects and defines the acceptable defect level for the BDL3215E/BDL4225E LCD screen. In
order to qualify for repair under warranty, the number of pixel defects must exceed a certain level which is given in the reference table. If
the LCD screen is within specification a warranty exchange / claim back will be refused. Additionally, because some types or combinations of
pixel defects are more noticeable than others, Philips sets even higher quality standards for those.
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.
RR G B
RR G B
Types of Pixel Defects + Dot definition
Pixel and sub-pixel defects appear on the screen in different ways. There are three categories of pixel defects and several types of sub-pixel
defects within each category.
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One or more defective, adjacent sub-pixel are defined as one “dot”. The no. of defective sub-pixels are not relevant to define a defective
dot. This means that a defective dot can consist of one, two or three defective sub-pixels which can be dark or lit.
RR G B
Bright Dot Defects
Bright dot defects appear as pixels or sub-pixels that are always lit or “on”. These are the examples of bright dot defects:
RR
G
B
R
R
Y
C
W
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 dot)
subpixel subpixel subpixel
pixel
One dot = One Pixel; consists of three sub-pixels of Red; Green and Blue