Polarizer Defects - NEC MultiSync 20WGX2 Service Manual

7.2 Polarizer Defects

7.2 Polarizer Defects
Scratches Scratches
Dent Dent
Where, W :Width Where, W :Width
L : Length L : Length
D : A D : Average diameter =(a verage diameter =(a+b)/2
Note) Note)
a. Average Diameter a. Average Diameter
b. b. Linear Linear : : a a >2b >2b , ,
c. Extraneous substances w c. Extraneous substances which can be wiped out, li
defect. defect.
d. Defects which is on d. Defects which is on the Black Matrix(outside of Act
Items Items
Linear Linear
Circular Circular
+b)/2
b b
Circular : : a a Circular 2b 2b
≦ ≦
hich can be wiped out, like Finger Print, Particles are
the Black Matrix(outside of Active Area) are not considered as a
Criteria Criteria
0.1 0.1 W W 0.2 , 0.3 0.2 , 0.3 W W
≦ ≦ ≦ ≦ ≦ ≦
D D ≦ ≦ 0.5 , N 0.5 , N ≦ ≦ 3 3
a+b a+b
D= D=
2 2
a a
ke Finger Print, Particles are not considered as a
ive Area) are not considered as a defect.
5-18 5-18
2.0 , N 2.0 , N 3 3
≦ ≦ ≦ ≦
not considered as a
defect.