NEC MultiSync 20WGX2 Series, Service Manual

Page: 65 / 143

5-17
7. External Inspection on the LCD Module
7.1 Inspection Condition
7.1.1 Conditions
Ambient conditions :
a. Temperature : 20~25
o
C
b. Humidity : 65 +/- 5 % RH
c. Illumination : Single 20W fluorescent lamp non-directive
(Appearance - 300 to 700 Lux , Display
–
180 to 200 Lux)
Viewing distance :
The distance between the LCM and the inspector
’
s eyes shall be at least 35cm.
Viewing Angle :
The inspection shall be conducted within normal viewing angle range.
( Refer to the CAS for viewing angle)
7.1.2 Dot Defect
7.1.2.1 Bright Dot
Dots (sub-pixels) which appeared brightly in the screen when the LCM displayed with dark
pattern.
-R,G or B 1 dot ----------------------------------------- 2 Max (BDF 95%)
-Adjacent 2 dots --------------------------------------- 0 Max
-Adjacent 3 dots --------------------------------------- 0 Max
-Total amount of Bright dots ----------------------- 2 Max
-Bright dot density ------------------------------------- Within
Φ
10 mm
* Small bright dot which can be seen on 64 gray pattern is to be counted asone small bright
dot defect. (Max N
≦
3 within 10mm*10mm, Total Max N
≦
8) Size of small bright dot (1/20
<R,G,B
≦
1/2)
7.1.2.2 Dark Dot
Dots(sub-pixels) which appeared darkly in the screen when the LCM displayed with bright
pattern.
-R,G or B 1 dot ------------------------------------------ 5 Max
-Adjacent 2 dots ---------------------------------------- 2 Max
-Adjacent 3 dots ---------------------------------------- 0 Max
-Total amount of Dark dot ---------------------------- 6 Max
-Dark dot density --------------------------------------- Within
Φ
10 mm
7.1.2.3 Total amount of Dot Defects ---------------------------- 8 Max (Combination)
Note) a. Every dot herein means Sub-Pixel. (Each Red,Green, or Blue Color)
b. Damaged less than half size of sub-pixel is not counted as defect.
c. Dots darker than half brightness of sub-pixel are not defined as bright dot defectand dots brighter
than half brightness of sub-pixel is not defined as dark dot defect.