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)
1.4.5.2 Display Degradation
Over the life of the product , variation of the parameters
specified in Panel specification shall be maintained
within reasonable limits.The panel must not exhibit any
significant defects while in operation ( excluding the
CCFL operation ).This does not in any way change the
warranty given by the panel manufacturer .
1.4.5.3 Light Leakage
Except for the active display area , there shall be no
light emission visible from any angle from any other part
of the display . For this test , the ambient illumination
must follow panel's specification.
1.4.5.4 Allowable Defects
No cosmetic defects are allowed except those specified
below.The conditions of visual inspections are as follows
For 24W 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.
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Dark/Spots/Lines
Spotsor lines thatap pear dark in the display patternsand are
usually theresult ofconta m ination.D e fe cts don o t varyin
size o r intensity(c o n tra st) when contrastvo lta g e isvaried .
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) whe n
contrastvoltage is varied.C ontrastvariation can be achieved
throughthe use of varying gray shade patterns.
PolarizerScratch
When theu n it lights,lines appear lig h t (white) w ithdisplay
patterns darka n d don o t varyin size.P h y sic a l damage tothe
polarizerthatdoes not dam age the glass
PolarizerDent
When the unitlights , spots a p p e ar light (w hite)w ith display
patterns darka n d do n o t vary in size.P h y sic a l damage tothe
polarizerthatdoes not dam age the glass.
Rubbin g Line
Horizontalordiagonallinesthatappeargray with the display
patternsdarkandm ayhave resultedfrom an “outof control”
rubbing process onthe polyimide or“wav e s” onthe BEFs or
prismsheets.
NewtonR ing The“rainbow” effectcaused bynon-uniformcellthickness.
Mottling
When theu n it lights,varia tio n /non –unifo r m ity
(splotchin es s) appears light(white ) withth e display an d
mightvary insize.
DimLine When theu n it lights,line(s ) inthe monitor ( v ertic a l) orma jo r
(horizon tal) axisap p e ar dim,b u t notco m pletelyon oroff.
CrossLinesOff When theu n it lights,lines inboth them inorand major a x is
donot appear.
Bright/DarkDot Asub–pixel(R,G,Bdot)stuckoff/on(electrical).
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 25.4mm
2.51mm ~ 3.75 mm 3 25.4 mm
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, they must be at least 15mm apart.
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ACERG24