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User Manual BDL4771V
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6. PIXEL DEFECT POLICY
We strive to deliver the highest quality products and use some of the industry's most advanced manufacturing processes
whilst practicing 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 LCD display 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 BDL4771V LCD
screen. In order to qualify for repair under warranty, the number of pixel defects must exceed a certain level as shown 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 is defined as one "dot". The number of defective sub-pixels is 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.
subpixel subpixel
subpixel
pixel
One dot = One Pixel; consists of three sub-pixels of Red; Green and Blue
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