NL10276BC30-10 NEC, NL10276BC30-10 Datasheet - Page 9

• Manufacturer Part Number: NL10276BC30-10
• Description: TFT COLOR LCD MODULE
• Manufacturer: NEC

4.3.2 Driving for backlight lamp
Note1: This product consists of 2 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"
Note3: The asymmetric ratio of working waveform for lamps (Lamp voltage peak ratio, Lamp
Note4: In case "FO" is not the recommended value, beat noise may display on the screen, because
Note5: Method of lamp cable installation may invite fluctuation of lamp current and voltage or
Lamp current
Lamp voltage
Lamp starting voltage
Oscillation frequency
are the voltage value between low voltage side (Cold) and high voltage side (Hot).
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).
sufficiently.
of interference between "FO" and "1/th". Recommended value of "FO" is as following.
When design the backlight inverter, evaluate asymmetric of lamp working waveform
asymmetric of lamp working waveform. When design the backlight inverter, evaluate the
fluctuation of lamp current and voltage or asymmetric of lamp working waveform
sufficiently.
Pb
Pa
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
FO =
Parameter
0
th: Horizontal cycle period (See "4.9.2 Timing characteristics".)
n: Natural number (1, 2, 3
Sa
1
4
PRELIMINARY DATA SHEET DOD-M-1297 (4th edition)
th
1
Symbol
VBLH
(2n-1)
IBL
Sb
VS
FO
1500
1300
Min.
3.5
45
)
-
Typ.
560
7.5
54
-
-
Sa - Sb
Pa - Pb
Sb
Pb
Max.
8.0
65
-
-
-
100 5 %
100 5 %
mArms
Vrms
Vrms
Vrms
Unit
kHz
NL10276BC30-10
at IBL=7.5mArms:
L=250cd/m
(Ta=
Note2, Note3
Note2, Note3
Note2,Note3
Ta = 25 C
Ta = 0 C
Remarks
Note3
Note4
25 C
2
(Typ.)
Note1)
9