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4.3.2 Backlight lamp
Parameter
Lamp current
Lamp voltage
Lamp starting voltage
Lamp oscillation frequency
Note1: This product consists of 6 backlight lamps, and these specifications are for each lamp.
Note2: The lamp voltage cycle between lamps should be kept on a same phase. "VS" and "VBLH"
are the voltage value between low voltage side (Cold) and high voltage side (Hot).
Note3: The asymmetric ratio of working waveform for lamps (Lamp voltage peak ratio, Lamp
current peak ratio and waveform space ratio) should be less than 5 % (See the following
figure.). If the waveform is asymmetric, DC (Direct current) element apply into the lamp. In
this case, a lamp lifetime may be shortened, because a distribution of a lamp enclosure
substance inclines toward one side between low voltage terminal (Cold terminal) and high
voltage terminal (Hot terminal). When designing the inverter, evaluate asymmetric of lamp
working waveform sufficiently.
Pa: Supply voltage/current peak for positive, Pb: Supply voltage/current peak for negative
Sa: Waveform space for positive part, Sb: Waveform space for negative part.
Note4: A beat noise by interference of "FO" and "1/th" may appear on the screen. (th: Horizontal
cycle (See "4.8.1 Timing characteristics".)) Set up the "FO" so that the beat noise does not
appear.
Note5: Method of lamp cable installation may invite fluctuation of lamp current and voltage or
asymmetric of lamp working waveform. When designing method of lamp cable installation,
evaluate the fluctuation of lamp current, voltage and working waveform sufficiently.
Symbol
IBL
VBLH
VS
FO
Pa
Sa
0
Pb
DATA SHEET DOD-PD-1318 (4th edition)
min.
typ.
max.
3.0
6.0
7.0
-
750
-
1,220
-
-
1,460
-
-
50
58
60
Sb
NL204153BM21-01/01A
(Ta=25 C, Note1)
Unit
Remarks
at IBL= 6.0mArms:
mArms
800 cd/m
Note3
Vrms
Note2, Note3
Ta = 25 C
Vrms
Note2, Note3
Ta = 0 C
Vrms
Note2, Note3
kHz
Note4
Pa - Pb
100 5 %
Pb
Sa - Sb
100 5 %
Sb
2
9
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