Barco KVD5521 - Cosmetic Specification; Inspection Conditions; Definition of Dot Defect; Dot Classification Method

10.11 Cosmetic specification
10.11.1 Inspection conditions
Ambient illumination 300-700 Lux
Ambient temperature 20 - 25°C
Ambient humidity 65 ± 5 %
Viewing distance minimum 4x height of panel
One display pixel contains three subpixels or dots (red, green, and blue).
10.11.2 Definition of dot defect
If the luminance of a dot is brighter or darker than the surrounding dots, this is called a dot defect.
Bright dot Dots (subpixels) which appear brightly in the screen when displaying a dark pattern
Dark dot Dots (subpixelx) which appear darkly in the screen when displaying a bright pattern
 Dots smaller than half a subpixel are not counted as defect dots.
 The dot defect is inspected on red, green, blue, white or black pattern.
 Defects which are outside the active area are not considered as defect.
Dot Defect Type
Max
Bright dot Random 3
Adjacent 2 dots 1
Dark dot Random 7
Off dot Random 10
Adjacent 2 dots 2
Adjacent 3 dots 1
Total amount of dots 15
Minimum distance between defects Bright dot - bright dot 5 mm
Dark dot - dark dot Ignore
10.11.3 Dot classification method
The criteria of dot is defined by its brightness as below:
Comparison of brightly visible dot with background
• Step 1
Detect bright dots at 0% gray level (black background). If any dots are visible, go to 25% gray level.
• Step 2
At 25% gray level:
- If the dot is no longer visible, it does not count;
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Barco - KVD5521, IVD5521, HVD5521 - R591341 - User Manual - Revision 05 - November 2016