Standards For Display Conditions (Standard For Errors/Defects) - NEC LCD1550X Service Manual

2.9.3 Standards for display conditions (standard for errors/defects)

In case the state of the picture displayed is not fully stable (when the power switch is turned ON/OFF, the back
light is operating to turn on and so on), the following standards should not be applied.
No.
Joined
defects
Dot
defect
Defective
Appearance
proximity
inspection
during
1
back light
ON
Total
numbers
of defect
*9:1) The defective part over 30% (compare to area) of 1 dot is regarded as a dot defect.
2) When the picture pattern is set to black, the luminance more than 30% of 1 dot is regarded as a bright mode dot
defect.
3) When the picture pattern is set to w hite, the luminance below 70% of 1 dot is regarded as a black mode dot defect.
4) An independent defective dot (not adjoined to other defective dot) is regarded as a point dot defect.
5) The one composed of "n" pieces of linked defective dots is regarded as an "n" points linked dot defect.
*10: DO NOT use "ND" filter in counting bright dot(s).
:Bright dot
Note 1: R + G, 2 dots continued horizontally, G+B, 2 dots continued horizontally
To be counted as NG
R G
G B
Item
Continuous 2 bright dots
Continuous 2 black dots
Continuous 3 or more bright dots
Continuous 3 or more black dots
Dot defects other than
Adjacent same colored bright dot
defects
Approach of adjacent defects of
Defect cluster
Total numbers of bright dots (R/G/B) and black dots (R/G/B)
Total numbers of bright dots in G
:Black dot
Not to be counted as NG:
Combination of bright
and black dot
R G R G
G B
Standard
R + G, 2 continued horizontally
G + B, 2 continued horizontally
Both same and different colored
dots should be counted.
and R/G/B (black and bright dots)
Distance betw een defects
Distance between defects
Distance of approach
A set of 2 or more dot defects in an
area of 5x5 pixels
( in consideration)
Approach of adjacent defects of
in an aria of 5x5 pixels
Approach of adjacent defects of
in an aria of 5x5 pixels
Combination other than
2-horizontal combination
R G R
G
2-17
Allow ance
2
2
0
0
4
Each color
5.5mm
6.5mm
2
15mm
0
Cluster
2
0
4
4
G
R
and so on.
Unit Remarks
Note 1
Note 2
Pairs
Note 3
Piece Note 4
Note 5
Pairs
Note 6
Note 7
Pairs Note 8
-
Piece
-