Inspection Conditions - NEC LCD1511M Service Manual

2. Defect, Scratch and Dust

Inspection conditions:

(a) Viewing distance is approximately 15~50cm
(b) Ambient illuminant is from 300 to 500lux.
(c) Viewing angle is normal to the LCD panel.
(d) Ambient temperature is approximately 25deg C.
(e) Input signal clock frequency: 40MHz
VISUAL
DEFECT
ELECTRICAL
DEFECT
1) D: diameter, W: horizontal width, L: vertical high, N: number
DEFECT TYPE
Dark/ Bright Spot
Circular Foreign Material
Bright or Dark Line
Foreign Material
Polarizer/ Linear Scratch
Polarizer- Bubble/ Peeling
Maximum Allowable Defect
Count All Types
Bright Dot Random
Bright Dot – Green
Bright Dot – 2 Adjacent
Dark Dots – Random
Dark Dots – 2 Adjacent
Dark Dots – 3 or More
adjacent
Total Bright and Dark Dots
Minimum Distance Between
Bright Dots
Minimum Distance Between
Bright and Dark Dots
Minimum Distance Between
Dark Dots
LIMIT
0.2mm ≤ D ≤ 0.5mm
N ≤ 7
0.05mm ≤ W ≤ 0.2mm
0.3mm ≤ L ≤ 3mm, N ≤ 5
0.01mm ≤ W ≤ 0.5mm
1.0mm ≤ L ≤ 10mm, N ≤ 5
Average D ≤ 0.5mm, N ≤ 6
N ≤ 7
N ≤ 4
N ≤ 3
N ≤ 2
N ≤ 6
N ≤ 3
N = 0
N ≤ 6
15 mm
10 mm
5 mm