NEC LCD1550X Service Manual page 130

Lcd display
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Notes 9
1. Dot defect
Defective part exceeds 30% of area at one dot.
2.Dot defective with luminous mode:
Luminous dot which bright more than 30% Cwhen display the screen with all black
pattern.
3. Dot defective with dark mode:
Luminous dot which bright more than 70% C when display the screen with all white
pattern.
4.One dot defect:
The defective isolated dot.(Start that it is not adjacent to other defective dots.)
5.Linkage (Adjacent) dots:
To defined as linked two or more adjacent defect dots.
6.Average Diameter defined as follows.
D:A verage Diameter
D=(a+b)/2
Definition of defect dot: Defect area is out of 1/3 dot size. Defect size is confirmed by using 10 times of loupe.
Also dot defects include intermittent bright and dark dots which can be recognized with
the naked eye.
R
1 dot
Note 10 : No ND Filter for luminance defects
Note 11. : A stain on the single color screen specified as follows.
Number: 1 max C Size:
Note 12. : Spot Mura judged by 128/255gradiation screen : Size : D=15mm Max
Note 13. : Ignore the thing that can be wiped out.
Note 14. : Applicable only in A area, not in B area
b
a
RGB
RGB
1 pixel
5x5 pixels
1.5mm max
- 19 -
Document No. VSPF-A028

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