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LCD Defect Specification

Repairable defects and their manifestations on LCD units

 Defect identificationDescription
CID - Customer Inducted DefectsScratch FrontScratched front display panel
Dust BLUDust or other contamination on BLU
Manufacturing defectsScratch BackScratched rear part of the display facing BLU
BubbleBubbles caught under polarised film
Dust PolfilmDust under polarised film
Polfilm DefectDefective polarised film (glossy, dirty or clotted)
BLU DefectIrregular function of BLU (no light or with apparent waves, spots and other imperfections)
Black ScreenBLU operative, black screen
White ScreenBLU operative, white screen
FlickerFlickering screen image
Signal ErrorSignal errors manifested through colour irregularities, interference, shadows, slow screen reaction and others
H-Block Horizontal block permanently lighted or dark (incl. colours)
H-LineHorizontal line permanently lighted or dark (incl. colours)
V-BlockVertical block permanently lighted or dark (incl. colours)
V-LineVertical line permanently lighted or dark (incl. colours)


Non-repairable defects and their manifestations on LCD units

 Defect identificationDescription
CID - Customer Inducted DefectsCrack (Broken)Broken glass panel
Mura BlackLarge or small (1cm) black mura
Manufacturing defectsCell defectLight halo around a defective pixel
Light leakageLight leaking beyond the image format
Mura ColorColour mura (yellow, strips, etc.). Irregular colour distribution.
Mura WhiteLarge or small (1cm) white mura
Pixel defectPermanently lighted or dark point(s), incl. colours
ZaratsukiClusters of colour points and/or lines
H-Line Cell Out DefectBroken or incomplete horizontal line, incl. colours
V-Line Cell Out DefectBroken or incomplete vertical line, incl. colours


Explanations:
BLU (BackLightUnit) - the display background illumination unit including CCFLs
Mura - a spot on the screen often seen only against grey background or from the side
Zaratsuki - an apparently random cluster of colour points and/or lines