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1.4.5.5 Defect Terminology
Table 3 gives the descriptive terms used in classifying
defects.
1.5 Optical 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)
Average Diameter smaller of
(L+W)/2 orL/20+2W
Acceptable Number Minimum Separation
< 0.1mm Non countable N / A
0.1 mm ~ 0.3 mm 10 15 mm
0.31 mm ~ 0.5 mm 10 15 mm
0.51 mm ~ 1.25 mm 5 15 mm
1.26 mm ~ 2.5 mm 3 25.4 mm
2.51 mm ~ 3.75 mm 3 25.4 mm
Greater than 3.75 mm NONE Not applicable
Note : Allowable distance between spots of two sizes is the minimum separation
number for the smaller spot. Therefore, if there are two spots, 1.30mm and 0.4mm
indiameter,theymustbeatleast15mmapart.
Dark/Spots/Lines
Spots orlinesthatappeardarkinthedisplay patternsand are
usuallythe resultofcontamination.Defectsdo notvaryin
size or intensity (contrast) when contrast voltage is varied.
Contrastvariation can beachieved throughthe use ofvarying
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.Contrastvariation can be achieved
through theuseofvarying gray shadepatterns.
PolarizerScratch
W hen the unit lights, lines appear light (white) with display
patternsdark and do notvaryin size.Physicaldamageto the
polarizerthatdoes notdamage the glass
PolarizerDent
When the unit lights, spots appear light (white) with display
patterns dark and do notvary in size.Physicaldamage to the
polarizerthatdoes notdamage the glass.
Rubbing Line
Horizontalordiagonallinesthatappeargraywith thedisplay
patternsdark and mayhave resulted from an “outofcontrol”
rubbing processon thepolyimideor“waves”on theBEFsor
prism sheets.
Newton Ring The“rainbow”effectcausedbynon-uniform cellthickness.
Mottling
W hen the unit lights, variation / non – uniformity
(splotchiness) appears light (white) with the display and
mightvaryinsize.
Dim Line
W hen the unit lights, line(s) in the monitor (vertical) or major
(horizontal)axisappeardim,butnotcompletelyon oroff.
CrossLinesOff
W hen the unit lights, lines in both the minor and major axis
do notappear.
Bright/Dark Dot A sub– pixel(R,G,B dot)stuckoff/on (electrical).
7
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ACER X193HQ