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Types of LCD defect

  
                

Types of LCD defect

Repairable defects and their manifestations on LCD units




 
Repairable defects          
Defect identification Description
Defects caused by customer
Scratch Front Scratched front display panel
Dust BLU Dust or other contamination on BLU
Manufacturing defects
Scratch Back Scratched rear part of the display facing BLU
Bubble Bubbles caught under polarised film
Dust Polfilm Dust under polarised film
Polfilm Defect Defective polarised film (glossy, dirty or clotted)
BLU Defect Irregular function of BLU (no light or with apparent waves, spots and other imperfections)
Black Screen BLU operative, black screen
White Screen BLU operative, white screen with coloured vertical lines
Flicker Flickering screen image
Signal Error Signal errors manifested through colour irregularities, interference, shadows, slow screen reaction and others
H-Block Horizontal block permanently lighted or dark (incl. colours)
H-Line Horizontal line permanently lighted or dark (incl. colours)
V-Block Vertical block permanently lighted or dark (incl. colours)
V-Line Vertical line permanently lighted or dark (incl. colours)
   

Non-repairable defects and their manifestations on LCD units




 
Non-repairable defects          
Defect identification Description
Defects caused by customer
Crack (Broken) Broken glass panel
Mura Black Large or small (1cm) black mura
Manufacturing defects
Cell defect Light halo around a defective pixel
Light leakage Light leaking beyond the image format
Mura Color Colour mura (yellow, strips, etc.). Irregular colour distribution.
Mura White Large or small (1cm) white mura
Pixel defect Permanently lighted or dark point(s), incl. colours
Zaratsuki Clusters of colour points and/or lines
H-Line Cell Out Defect Broken or incomplete horizontal line, incl. colours
V-Line Cell Out Defect Broken 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
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