External Inspection On The Lcd Module - NEC AccuSync LCD71VM Service Manual

2.5 External Inspection on the LCD Module

2.5.1 Inspection Condition
Ambient conditions
1) Temperature:
2) Humidity:
3) Illumination:
4) To be a distance about 35±5 cm in front of LCD unit, viewing line should be perpendicular to the
surface of the module judge the visual appearance with human's eyes.
5) Take off the protector of polarizer while judging the display area.
6) If there is any question while judging, check the panel again while operating.
2.5.2 Standards for Display Conditions
Standard for errors (defects)
(1) Bright dots
(2) Dark dots
Adjacent Dots
(3) Bright dots
(4) Dark dots
Dot Defect (5)
(6)
(7) Distance between (6)'s
Min. Distance
between bright
dots
(8) Fault cluster
Total amount of Bright Dot (R,G,B) and Dark Dot (R,G,B)
Total amount
of Dot Defects
Total amount of Bright Dot (G)
Note 9. Every dot herein means sub-pixel (each Red, Green or Blue color)
Note 10. Bright & Dark Dots are larger than one third of sub-pixel. (Dots smaller than one third of sub-pixel
are not counted as a defect dots.)
Note 11. Do not use the [ND] filter in counting a bright dot.
20~25°C.
65 ±.5% RH
Fluorescent light (Day-Light Type) display surface illumination to be 300 ~ 700
Lux. (standard 500Lux.)
Item
Dot defects except (1)
and (2)
Distance between bright
dots
Criteria
Horizontally adjacent 2 dots
(R+G, G+B)
Horizontally, vertically
combined adjacent 3 dots
(separately bright dots and
dark dots)
R or G or B (Bright Dot +
Dark Dot)
Distance between bright dots
(R - R): less than 6.5mm
Distance between (6)s : less
than 10mm
Two or more pixels
sub-pixels with more than
one fault of (5).
Two or more pixels
sub-pixels with more than
one fault of (1).
Two or more pixels
sub-pixels with more than
one fault of (2).
5-7
Remark
Max. 1 Note 1
Note 2
Max. 2
or
Not Allowed
Note 3
Not Allowed
Bright
Dark 6
Note 4
Max. 7
(Dark+Bright)
Max. 2 for
Note 5
each color
Not Allowed Note 6
or
Max. 3 Note 7
or
Not Allowed Note 8
or
Max. 10
Max. 2
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