Akai LCT2785TA, Service Manual

Page: 52 / 64

7. OPTICAL CHARACTERISTICS
7.1 TEST CONDITIONS
Item Symbol Value Unit
Ambient Temperature Ta
25
±
2
o
C
Ambient Humidity Ha
50
±
10
%RH
Supply Voltage V
CC
5.0 V
Input Signal According to typical value in "3. ELECTRICAL CHARACTERISTICS"
Lamp Current I
L
4.7
±
0.5
mA
Oscillating Frequency (Inverter) F
W
56
±
3 KHz
7.2 OPTICAL SPECIFICATIONS
The relative measurement methods of optical characteristics are shown in 7.2. The following items should
be measured under the test conditions described in 7.1 and stable environment shown in Note (6).
Item Symbol Condition Min. Typ. Max. Unit Note
Contrast Ratio CR (1000) - (2)
Response Time
Gray to gray
average
(8) ms (3)
Center Luminance of White L
C
(550) cd/m
2
(4)
White Variation
δ
W
(1.3) - (7)
Cross Talk CT (4) % (5)
Rx (0.652) -
Red
Ry (0.331) -
Gx (0.275) -
Green
Gy (0.597) -
Bx (0.143) -
Blue
By (0.063) -
Wx (0.285)
White
Wy (0.293)
Target
(6) Color
Chromaticity
Color Gamut CG
θ
x
=0
°
,
θ
Y
=0
°
Viewing Normal
Angle
(75) % NTSC
θ
x
+
(88)
Horizontal
θ
x
-
(88)
θ
Y
+
(88)
Viewing
Angle
Vertical
θ
Y
-
CR
≥
20
(88)
Deg. (1)
Version 1.0
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