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3.2 BACK-LIGHT UNIT
The backlight system is an edge-lighting type with a single CCFL ( Cold Cathode Fluorescent Lamp ).
The characteristics of a single lamp are shown in the following table.
- INVERTER : SIC130T(Typical 60kHz)
Item
Lamp Current
Lamp Voltage
Frequency
Power Consumption
Operating Life Time
Startup Voltage
Note) The waveform of the inverter output voltage must be area symmetric and the design of the
inverter must have specifications for the modularized lamp.
The performance of the backlight, for example life time or brightness, is much influenced by the
characteristics of the DC-AC inverter for the lamp. So all the parameters of an inverter should be carefully
designed so as not to produce too much leakage current from high-voltage output of the inverter.
When you design or order the inverter, please make sure that a poor lighting caused by the mismatch of
the backlight and the inverter(miss lighting, flicker, etc.) never occur. When you confirm it, the module
should be operated in the same condition as it is installed in your instrument.
Note (1) Lamp current is measured with a high frequency current meter as shown below.
(2) Lamp frequency may produce interference with horizontal synchronous frequency and this
may cause line flow on the display. Therefore lamp frequency should be detached from the
horizontal synchronous frequency and its harmonics as far as possible in order to avoid interference.
(3) Refer to I
(4) Life time (Hr) of a lamp can be defined as the time in which it continues to operate under the
condition Ta= 25 ± 2 °C and I
1. When the brightness becomes 50% or lower than the original.
2. When the Effective ignition length becomes 80% or lower than the original value.
(Effective ignition length is defined as an area that has less than 70% brightness compared to
the brightness in the center point.)
(5) The inverter open voltage - this voltage should be measured after ballast capacitor- have to be larger
than the lamp startup voltage, otherwise backlight may has blinking for a moment after turns on
or not be turned on.
If an inverter has shutdown function it should keep its open voltage for longer than 1 second
even if lamp connector open.
6DPVXQJ 6HFUHW
Doc.No.
LTN133AT08-101
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Symbol
Min.
I
3.0
L
V
-
L
f
50
L
P
-
L
Hr
10,000
V
-
S
LCD
MODULE
×V
to calculate.
L
L
= 6.0 mA
L
Rev.No
Typ.
Max.
6.0
6.5
640
-
60
65
3.84
-
-
-
1080
-
1295
HOT :Dark Gray
1
COLD : Black
2
A
until one of the following event occurs.
rms
04-A00-G-080929
Approval
Ta= 25 ± 2 °C
Unit
Note
mArms
(1)
Vrms
I
= 6.0mA
L
KHz
(2)
(3)
W
I
= 6.0mA
L
Hour
(4)
Vrms
25°C, (5)
Vrms
0°C, (5)
INVERTER
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