Philips BDL4250EL Flat Panel Television User Manual


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BDL4250EL / BDL4650EL
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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 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denestheacceptabledefectlevelforthe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specication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
subpixel
pixel
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 denition = What is a defective “Dot”? :
Oneormoredefective,adjacentsub-pixelaredenedasone“dot”.Theno.ofdefectivesub-pixelsarenotrelevanttodene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
One dot = One Pixel; consists of three sub-pixels of Red, Green, and Blue.
6.3. 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:
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)
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