Samsung LNT4669F Training Manual page 160

We have defined the Side Viewing Image Quality Distortion Index of LCD
∆
B
i j front , (
=
VQDI
∆
B = 116(Y/Y
− ∆
B
) i j side , ( )
B
i j front , ( )
i j ,
) - 16
1/3
n
- ΔB : Brightness difference
i,j
between i gray and j gray
- < > : average in all cases of
arbitrary i, j grays
=
0 255 ~
100
90
80
70
60
50
40
30
20
10
0
D point
0
SEC 32 inch
4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64
Gray
0°
15°
30
45
60
75