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4.5.6. Smudges, Streaks and Smears
When viewing the panel oriented so as to maximize reflected light, there shall be no visible smudging,
streaking, smearing or other non-uniformity from contaminants, fingerprints, or defects in any of the visible
surfaces. This is independent of whether the unit is operating or off.
4.5.7. LCD
Inspection
Put LCD panel on inspection table and illuminate the panel with a daylight fluorescent lamp located above the
panel surface such that the luminance at the LCD panel is between 1000 lux. and 1500 lux. Defect limits are
given as following.
Average Diameter
Smaller of (L+W)/2 or L/20 + 2W
Acceptable Number
Minimum Separation
< 0.1mm
Non countable
N / A
0.1mm - 0.3mm
10
15mm
0.31mm - 0.5mm
10
15mm
0.51mm - 1.25mm
5
15mm
1.26mm - 2.5mm
3
25.4mm
2.51mm - 0.3mm
3
25.4mm
Greater than 3.75mm
None
Not applicable
Allowable distance between spots of two sizes is the minimum separation number for the smaller spot.
Therefore, if there are two spots, 1.30mm and 0.4mm in diameter, they must be at least 15mm apart.
Note: Per panel specification, over the life of the product, variation of parameters specified in
Panel specification shall be maintained within reasonable limits. Check supplier quality
inspection criteria for the detail information.
5. Optical
Characteristics:
5.1. Brightness uniformity
The uniformity is determined by using a photometer (CA-210) to measure the 9 points luminance in front of monitor
after at least 30 minutes warm up. It shall be test at 1680x1050/60Hz mode and full white square pattern with contrast
and brightness in default value. The values specified are at an approximate distance 20 cm from the LCD surface and
at 0 viewing angle.
5.1.1. The 9 test points are defined as the right
photo.
5.1.2. The brightness uniformity is calculated as below :
Brightness uniformity 75
≧
%