Acer LCD MB243WABNS Service Manual Download Page 8

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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)

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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D a r k / S p o t s / L i n e s

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
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 .

B r i g h t S p o t s / L i n e s

S p o t s

o r

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

p a t t e r n s .

D e f e c t s

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

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 .

P o l a r i z e r S c r a t c h

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 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

P o l a r i z e r D e n t

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 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 .

R u b b i n g L i n e

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 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 .

M o t t l i n g

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
( 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 .

D i m L i n 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
( 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 .

C r o s s L i n e s 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
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 ) .

Average Diameter smaller of

(L+W)/2 or L/20+2W

Acceptable Number

Minimum Separation

< 0.1mm

Non countable

N / A

0.1 mm ~ 0.3 mm