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User Manual BDL5571V
51
6. 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
BDL5571V 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.
6.1. 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.
6.2. 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.
Dot definition = What is a defective "Dot"? :
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.
One dot = One Pixel; consists of three sub-pixels of Red; Green and Blue
subpixel
subpixel
subpixel
pixel
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