Philips BDL8470QT - Pixel Defect Policy; Pixels And Sub-Pixels; Types Of Pixel Defects + Dot Definition; Bright Dot Defects

BDL8470QT
29
8. 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.
8.1. 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.
8.2. 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.
8.3. 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)