Akai LCT2715 Service Manual page 69

Note (1) Definition of Viewing Angle (θx, θy):
Viewing angles are measured by EZ-Contrast 160R (Eldim)
θ = 90º
X-
6 o'clock
= 90º
θ
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 (7).
Note (3) Definition of Gray to Gray Switching Time :
100%
90%
Optical
Response
10%
0%
The driving signal means the signal of gray level 0, 63, 127, 191, 255.
Gray to gray average time means the average switching time of gray level 0 ,63,127,191,255 to each
other .
θx = θy = 0º
θy-
x-
y-
Gray to gray
switching time
Normal
θ
y+
y+
θx−
θx+
Gray to gray
switching time
23
12 o'clock direction
θ = 90º
y+
x+ θ = 90º
X+
Time