TFT Inspection Criterion

Inspection Criterion
1. Sampling Method
Unless otherwise agreed upon in writing, the sampling inspection shall be applied to
the Customer’s incoming inspection.
1)
2)
3)
4)
5)
Lot size: Quantity per shipment lot
Sampling type: Normal inspection , single sampling
Inspection level: Ⅱ
Sampling table: MIL-STD-105D
Acceptable Quality Level(AQL): Major=0.65 Minor=1.5
2. Inspection Method
1) Ambient Condition:
a. Temperature: Room temperature 25±5℃
b. Illumination: Single fluorescent lamp non-directive(300 to 700 Lux)
2) Viewing distance
The distance between the LCD and the inspector’s eyes shall be at least
30-50cm.
3) Viewing Angle
The inspection shall be conducted within normal viewing angle range.
3. Inspection Criteria
3.1. Major defect
No.
Item
1
All
functional
defects
2
Missing
3
Inspection Standard
1)
2)
3)
4)
5)
6)
No display
Display abnormally
Open or missing segment
Short circuit
Excess power consumption
Backlight no lighting, flickering and abnormal
lighting
Missing component
Outline
Overall outline dimension beyond the drawing is
dimension not allowed
Classification
of defects
Major
Major
Major
3.2. Cosmetic Defect
No.
Item
Classification
Inspection Standard
of defects
For dark/white spot,
size Ф is defined
as Ф=(x+y)/2
1
2
(spot defect)
Black and
White spot
pinhole
(line defect)
Black and
White line
Polarizer
scratch
Size Ф (mm)
Acceptable Quantity
Ф≤0.1
Ignore
0.10≤Ф≤0.15
0.15≤Ф≤0.2
2
1
0.2<Ф
0
Width(mm)
Length(mm);Acceptable Qty
Ф≤0.03
Ignore
0.03<W≤0.05
L≤3.0; N≤2
0.05<W≤0.1
L≤2.0; N≤2
0.1<W
Define as spot defect
Minor
Minor
Dent or bubble(between the polarizer and glass)
3
Polarizer
defect
Size Ф(mm)
Acceptable Qty
Ф≤0.10
Ignor
0.10<Ф≤0.20
2
0.20<Ф≤0.30
1
0.30<Ф
0
Minor
3.3. Cosmetic Defect
No.
Item
Inspection Standard
Classification
of defects
1) Chip on the corner
Minor
X
Y
Z
≤3.0
≤S
≤T
Remark: S=contact pad length;
T=the thickness of glass
Chips on the corner of terminal shall not be
allowed to extend into the ITO pad or expose
perimeter seal. Acceptable Quantity N≤2.
2) Chip on the edge of glass
1
Glass defect
Minor
X
Y
Z
Ignore
≤0.5
≤T
Acceptable Quantity: N≤2
3) Creak
Creaks tend to break are not allowed.
Minor