1.Product Specification (continued)
1.4.5.4 Allowable Defects
No cosmetic defects are allowed except those specified
below. The conditions of visual inspections are as
follows :
For 23 series
Viewing distance is to be approximately 35-50cm
Ambient illumination is to be 300 to 700 lux. Viewing
angle shall be at 90 degree. Defects not apparent within
one minute shall be ignored.
1.4.5.5 Defect Terminology
Table 3 gives the descriptive terms used in classifying
defects.
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 non-uniformity 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
will be reviewed as they become apparent. These
panels will be referred to the 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 .
Table 4
AverageDiameter smaller of
(L+W)/2 or L/20+2W AcceptableNumber MinimumSeparat ion
<0.1mm Noncountable N/ A
0.1mm~0.3mm 10 15mm
0.31mm ~ 0.5 mm 10 15 mm
0.51mm ~ 1.25 mm 5 15m m
1.26mm ~ 2.5 mm 3 25.4mm
2.51mm ~ 3.75 mm 3 25.4 mm
Greaterthan 3.75 mm NONE Notapplicabl e
Note: Allo wable distance between spots of two sizes isthe minimum separ ation
numberforthesmallerspot. Therefore,ifthereare two spots,1.30mmand 0.4mm
in diamete r, they mu st be at l east 15mm apart.
1.5 Optical Characteristics
Depends on the LCD supplier's spec. Details refer to QA
Inspection Spec.
Dark/Spots/Lines
Spotsor linesthat appeardark in the displaypatterns and are
usuallytheresultof contamination.D efectsdo not vary in
sizeorintensity(contrast)when contrastvoltageisvaried.
Contrastvariationcanbe achieved through theuse of varying
grayshade patterns.
BrightSpots/ Lines
Spots or lines that appearlight in the display patterns.
Defects do not vary in size or intensity(contrast) when
contrastvoltageis varied.C ontrastvariationcan be achieved
throughtheuse of varying grayshade patterns.
PolarizerScratch
When the unitlights, lin es appea r light (wh ite) with d isplay
patternsdarkand do not varyin size. Physicaldamage to the
polarizerthatdoesnot dam age the glass
PolarizerDent
When the unitlights, spots appear light(white) with display
patternsdarkand do not vary in size.Physical damage tothe
polarizerthatdoesnot dam age the glass.
RubbingLine
Horizontalordiagonal linesthat appear grayw iththe display
patternsdarkand may have resultedfrom an “out of control”
rubbingprocesson the polyimideor “w aves”on the BEFs or
prismsheets.
NewtonRing The“rainbow” effectcaused by non-uniform cell thickness.
Mottling
Whenthe unit lights,variation/ non – uniformity
(splotchiness) a ppears ligh t (white) w ith the disp lay and
mightvaryinsize.
DimLine Wh en the un it lights, line(s) in th e mon itor (vertical) o r major
(horizontal)axisappeardim, but not completelyon oroff.
CrossLinesOff Whentheunit lights,linesin both the minor and majoraxis
donot appear.
Bright/D arkD ot Asub – pixel (R,G,B dot)stuck off /on (electrical).
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