NL204153BM21-01/01A
DATA SHEET DOD-PD-1318 (4th edition)
9
4.3.2 Backlight lamp
(Ta=25
q
C, Note1)
Parameter
Symbol
min.
typ.
max.
Unit
Remarks
Lamp current
IBL
3.0
6.0
7.0
mArms
at IBL= 6.0mArms:
800 cd/m
2
Note3
Lamp voltage
VBLH
-
750
-
Vrms
Note2, Note3
1,220
-
-
Vrms
Ta = 25
q
C
Note2, Note3
Lamp starting voltage
VS
1,460
-
-
Vrms
Ta = 0
q
C
Note2, Note3
Lamp oscillation frequency
FO
50
58
60
kHz
Note4
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.
Pa
Pb
Sa
Sb
0
_
Pa - Pb
_
Pb
u
100
d
5 %
u
100
d
5 %
_
Sa - Sb
_
Sb
