Akai LCT32AD Service Manual page 101

Note (1) Definition of Viewing Angle (θx, θy):
Viewing angles are measured by EZ-Contrast 160R (Eldim)
θ
= 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.
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 the figure in Note (8).
Note (3) Definition of Gray to Gray Switching Time :
100%
90%
Optical
Response
10%
0%
Normal
θx = θy = 0º
θy-
x-
θx−
Gray to gray
switching time
99／129
θ
y+
12 o'clock direction
y+
θ
= 90º
y+
θx+
Gray to gray
switching time
θ
x+
= 90º
X+
Time