Acer RA19WAANU Service Manual page 8

1.4.5.5 Defect Terminology
Table 3 gives the descriptive terms used in classifying
defects.
S p o t s o r l i n e s t h a t a p p e a r d a r k i n t h e d i s p l a y p a t t e r n s a n d a r e
u s u a l l y t h e r e s u l t o f c o n t a m i n a t i o n . D e f e c t s d o n o t v a r y i n
D a r k / S p o t s / L i n e s s i z e o r i n t e n s i t y ( c o n t r a s t ) w h e n c o n t r a s t v o l t a g e i s v a r i e d .
C o n t r a s t v a r i a t i o n c a n b e a c h i e v e d t h r o u g h t h e u s e o f v a r y i n g
g r a y s h a d e p a t t e r n s .
S p o t s o r
D e f e c t s
B r i g h t S p o t s / L i n e s
c o n t r a s t v o l t a g e i s v a r i e d . C o n t r a s t v a r i a t i o n c a n b e a c h i e v e d
t h r o u g h t h e u s e o f v a r y i n g g r a y s h a d e p a t t e r n s .
W h e n t h e u n i t l i g h t s , l i n e s a p p e a r l i g h t ( w h i t e ) w i t h d i s p l a y
P o l a r i z e r S c r a t c h p a t t e r n s d a r k a n d d o n o t v a r y i n s i z e . P h y s i c a l d a m a g e t o t h e
p o l a r i z e r t h a t d o e s n o t d a m a g e t h e g l a s s
W h e n t h e u n i t l i g h t s , s p o t s a p p e a r l i g h t ( w h i t e ) w i t h d i s p l a y
P o l a r i z e r D e n t p a t t e r n s d a r k a n d d o n o t v a r y i n s i z e . P h y s i c a l d a m a g e t o t h e
p o l a r i z e r t h a t d o e s n o t d a m a g e t h e g l a s s .
H o r i z o n t a l o r d i a g o n a l l i n e s t h a t a p p e a r g r a y w i t h t h e d i s p l a y
p a t t e r n s d a r k a n d m a y h a v e r e s u l t e d f r o m a n " o u t o f c o n t r o l "
R u b b i n g L i n e
r u b b i n g p r o c e s s o n t h e p o l y i m i d e o r " w a v e s " o n t h e B E F s o r
p r i s m s h e e t s .
N e w t o n R i n g T h e " r a i n b o w " e f f e c t c a u s e d b y n o n - u n i f o r m c e l l t h i c k n e s s .
W h e n t h e u n i t l i g h t s , v a r i a t i o n / n o n – u n i f o r m i t y
M o t t l i n g ( s p l o t c h i n e s s ) a p p e a r s l i g h t ( w h i t e ) w i t h t h e d i s p l a y a n d
m i g h t v a r y i n s i z e .
W h e n t h e u n i t l i g h t s , l i n e ( s ) i n t h e m o n i t o r ( v e r t i c a l ) o r m a j o r
D i m L i n e
( h o r i z o n t a l ) a x i s a p p e a r d i m , b u t n o t c o m p l e t e l y o n o r o f f .
W h e n t h e u n i t l i g h t s , l i n e s i n b o t h t h e m i n o r a n d m a j o r a x i s
C r o s s L i n e s O f f
d o n o t a p p e a r .
B r i g h t / D a r k D o t A s u b – p i x e l ( R , G , B d o t ) s t u c k o f f / o n ( e l e c t r i c a l ) .
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 .
Average Diameter smaller of
(L+W)/2 or L/20+2W
< 0.1mm
0.1 mm ~ 0.3 mm
0.31 mm ~ 0.5 mm
0.51 mm ~ 1.25 mm
1.26 mm ~ 2.5 mm
2.51 mm ~ 3.75 mm
Greater than 3.75 mm
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
in diameter, they must be at least 15mm apart.
1. Product Specification (continued)
l i n e s t h a t a p p e a r l i g h t i n t h e d i s p l a y
d o n o t v a r y i n s i z e o r i n t e n s i t y ( c o n t r a s t ) w h e n
Acceptable Number Minimum Separation
Non countable N / A
10 15 mm
10 15 mm
5 15 mm
3 25.4 mm
3 25.4 mm
NONE Not applicable
1.5 Optical Characteristics
Depends on the LCD supplier's spec. Details refer to QA
Inspection Spec.
p a t t e r n s .
7
ACER X193HQ
Go to cover page