Acer AL1512sg Service Manual - Page 10

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Note (1) Definition of Viewing Angle (θx, θy):
θ
x-
= 90º
X-
6 o'clock
y-
θ
= 90º
y-
Note (2) Definition of Contrast Ratio (CR):
The contrast ratio can be calculated by the following expression and figure
below.
Contrast Ratio (CR) = L255 / L0
L255: Luminance of gray level 255
L 0: Luminance of gray level 0
CR = CR (5)
CR (X) is corresponding to the Contrast Ratio of the point X at Figure in Note
(5).
Definition of luminance measured points and Brightness Uniformity:
Normal
θx = θy = 0º
θy-
θ
y+
θx-
θx+
Horizontal Line Number
0
256
0
192
1
384
576
3
767
Horizontal Line Number [pixel]
10
12 o'clock direction
θ
y+
= 90º
y+
x+
512
768
2
5
4
Active area
θ
= 90º
X+
1023
: test point
X
X=1 to 5