Akai LCT2765TD, Service Manual

Page: 91 / 105

Preliminary
Note (1) Definition of Viewing Angle ( θ x, θ y):
Viewing angles are measured by EZ-Contrast 160R (Eldim)
θ
X-
= 90º
θ
X+
= 90º
Normal
θ x = θ y = 0º
x+
y-
y+
x-
θ
y +
θ y-
θ x +
θ x −
6 o’clock
θ
y-
= 90º
12 o’clock direction
θ
y+
= 90º
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 :
Gray to gray
switching time
Time
Gray to gray
switching time
Optical
Response
100%
90%
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 .
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