1.4.5.5Defect Terminology
Table3 gives the descriptive terms used in classifying
defects.
1.5Optical Characteristics
Depends on the LCD supplier's spec. Details refer to QA
Inspection Spec.
1.4.5.6 Smudges, Streaks and Smears
When viewing the panel oriented so as to maximize
reflected light , there shall be no visible smudging ,
streaking, smearing or other nonuniformity from
contaminants ,fingerprints,or defects in any of the visible
surfaces. This is independent of whether the unit is
operating or off .
1.4.5.7 Other Defects
Undefined defects that are considered to be rejectable
by Lite–On will be reviewed by Lite-On as they become
apparent. These panels will be referred to the Lite - On
Corporate / Manufacturer Purchasing Agreement for
disposition.
1.4.5.8 LCD Inspection
Put LCD panel on inspection table and illuminate the
panel with a daylight fluorescent lamp located above the
panel surface such that the luminance at the LCD panel
is between 1000 lux and 1500 lux .Defect limits are given
in Table 4 .
1.Product Specification (continued)
AverageDiameter smaller of
(L+W)/2or L/20+2W AcceptableNumber MinimumSeparation
<0.1mm Noncountable N/ A
0.1mm ~ 0.3 mm 10 15 mm
0.31mm ~ 0.5 mm 10 15mm
0.51mm ~ 1.25 mm 5 15 mm
1.26mm ~ 2.5 mm 3 25.4 mm
2.51mm ~ 3.75 mm 3 25.4mm
Greaterthan 3.75 mm NONE Notapplicable
Note: Allowable distance between spots of two sizes is the minimum separation
numberfor the smaller spot. Therefore, if there are two spots, 1.30mm and 0.4mm
indiameter,theymustbeatleast15mmapart.
Dark/Spots/Lines
Spotsor lines thatap pear dark in the displayp atternsand are
usuallytheresultofcontamination.Defects do not vary in
size o r intensity (contrast) when contrast voltage isvarie d .
Contrastvariationcanbe achievedthrough theuse of varying
grayshade patterns.
BrightSpots/ Lines
Spots or lines that appear light in the display patterns.
Defects do not vary in size or intensity (contrast) when
contrastvoltage is varied.C ontrastvariation can be achieved
throughtheuse of varyinggray shadepatterns.
PolarizerScratch
When the unitligh ts , lines ap p e ar light ( w hite)w ith display
patternsdark and do not vary in size.Physical damage to the
polarizerthatdoes not dam age the glass
PolarizerDent
When theunitlights,spots appearlight(white) w ith display
patternsdarkand do not vary insize. Physicaldamage to the
polarizerthatdoes not dam age the glass.
Rubbin g Line
Horizontalordiagonallinesthat appear graywiththe display
patternsdark and may have resulted from an “out of control”
rubbingprocesson the polyimideor “waves” on the BEFs or
prismsheets.
NewtonR ing The “rainbow”effectcausedby non-uniform cellthickness.
Mottling
When the unitligh ts , variation /no n –u n if or m ity
(splotchin es s) appears light ( w hite)w ith the display a n d
mightvaryinsize.
DimLine W h en the unitligh ts , line(s) in the monitor (vertical) orm ajo r
(horizontal)axisappeardim,but not completelyon oroff.
CrossLinesOff Wh e n the unitligh ts, lines in both them inor an d majo r axis
donot appear.
Bright/Dark Dot Asub– pixel(R,G,B dot) stuckoff / on (electrical).
7
Go to cover page
ACERX193HQ