External Inspection On The Lcd Module - NEC AccuSync LCD51VM Series Service Manual

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2.5 External Inspection on the LCD Module

2.5.1 Inspection Conditions
25 ±5°C
Temperature:
Viewing distance: 20cm (The distance between the inspector's eye and screen.)
Direction and illumination:
Inspection for display specification: 0° ≤ θR ≤ 30°, 0° ≤ θL ≤ 30°
Inspection for appearance specification:
2.5.2 Display specification (Compliant with ISO 13406-2 Pixel faults class II)
(1) Adjacent 2 bright dots
(2) Adjacent 2 dark dots
Adjacent
defects
(3) Adjacent 3 or more bright dots
dots
(4) Adjacent 3 or more dark dots
Defect dot other than (1) and
Dot defect
(5)
(2)
Close 2 same color bright
(6)
dots
(7)
Close each set of (6)
Close
defect
dots
(8)
Cluster
Bright dots (R.G.B) + Dark dots (R.G.B)
Total
G (bright dots)
Definition of defect dot: Defect area is out of 1/3 dot size. Defect size is confirmed by using 10 times of
0° ≤ θU ≤ 20°
50 to 75 lx at a display surface
Item
loupe. Also dot defects include intermittent bright and dark dots which can be
recognized with the naked eye.
0° ≤ θR ≤ 45°, 0° ≤ θL ≤ 45°
0° ≤ θU ≤ 45°, 0° ≤ θD ≤ 45°
700 lx at an inspection desk surface
Specification
R+G horizontal adjacent
G+B horizontal adjacent
Same color and different
color
R.G.B (Bright dot + Dark
dot)
Distance
between
same color bright dots
≤ 6.5mm
Distance between each
set of (6) ≤ 10mm
2 or more defect dots (5)
in 5×5 pixels
2 or more sets of (1) in
5×5 pixels
2 or more sets of (2) in
5×5 pixels
5-7
Remarks
≤ 2 sets
Note 1
≤ 2 sets
Note 2
≤ 0 set
Note 3
≤ 0 set
≤ 4 dots
Note 4
2
R,G,B ≤ 2
Note 5
sets each
≤ 0 set
Note 6
≤ 2
Note 7
clusters
≤ 0 set
Note 8
≤ 4 dots
-
≤ 4 dots
-

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