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3.2 Back Light Unit
The back light unit is a direct type with 4 CCFTs ( Cold Cathode Fluorescent Tube )
The characteristics of two dual lamps are shown in the following tables.
Item
Lamp Current
Lamp Voltage
Lamp Frequency
Operating Life Time
Asymmetry rate
Inverter
waveform
Distortion rate
Startup Voltage
Note (1) Specified values are for a single lamp.
Lamp current is measured with current meter for high frequency as shown below.
Refer to the following block diagram of the back light unit for more information.
Panel Specification
Symbol
I
L
V
L
f
L
Hr
50,000
Wasy
Wdis
1.2726
Vs
Fig. Measurement point of Lamp Current
Min.
Typ.
3.0
6.5
-
650
40
-
-
-
-
1.414
0
-
-
25 : 1,370
Ta=25
Max.
Unit
7.0
mArms
-
Vrms
60
kHz
-
Hour
10
%
1.5554
: 1,550
Vrms
2 C
Note
(1)
(3)
(4)
(5)
(6)
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