Acer AL2216W Service Manual page 10

Definition of Viewing Angle (θx, θy):
(1)
θ
= 90º
X-
6 o'clock
θ
= 90º
y-
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Normal
θx = θy = 0º
θy-
x-
θx-
y-
θ
y+
12 o'clock direction
θ
y+
y+
θx+
10
= 90º
θ
x+
= 90º
X+