Appearance Inspection Standard - Waveshare 4.2inch e-Paper V2 User Manual

14.5.2 APPEARANCE INSPECTION STANDARD

NO. Item
B/W
1 spots/Bubble/Foreign
bodies/Dents
2 Glass crack
3 Dirty
Chips/Scratch/Edge
4
crown
Substrate color
5
difference
FPC
6 broken/Goldfingers
oxidation/scratch
PCB damaged/Poor
7
welding/Curl
8 Edge Adhesives
Standard
D≤0.25mm, Allowed
0.25mm<D≤0.4mm, N≤3
D>0.4mm, Not allow
Not Allowed
Allowed if can be removed
X≤3mm,Y≤0.5mm
2mm≤X or 2mm≤Y Allow
W≤0.1mm, L≤5mm, n≤2
Edge crown: X≤0.3mm, Y≤3mm
Allowed
Not allow
PCB (Circuit area) damaged Not
Allow, PCB Poor welding Not Allow
PCB Curl≤1%
Edge Adhesives H≤Display surface
37
4.2inch e-Paper V2
User Manual
Defect
Method
level
Visual
MI
Inspection
MA
Visual/
Microscope
MI
Visual/
MI
Microscope
Visual/
MA
Microscope
MI
Visual/Ruler
Scope
Zone A
Zone A
Zone B
Zone A
Zone B
Zone A
Zone B
Zone B
Zone B