
Doc.No.
Rev.No
Page
  LTN104S2-L01
/
25
 12
  04-002-G-001021
(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
L 
X V
L
 to calculate.
(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
L
 = 7 mA
rms 
until one of  the following  event  occurs.
      1. When the brightness becomes 50% or lower than it’s original.
      2. When the Effective ignition length becomes 80% or lower than it’s  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 voltage above this value should be applied  to the  lamp for more than 1 second to startup
     Otherwise the lamp may not  be turned on.
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 back-light, 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 back-light 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.
3.2  BACKLIGHT UNIT
The back-light system is an edge - lighting type with a single CCFT ( Cold Cathode Fluorescent Tube ).
The characteristics of a single lamp are shown in the following tables.
Ta=25 
±
  2
°
C
Note (1)
Lamp current is measured with a high frequency current meter as shown below.
No 2 Pin is V
LOW
.
  LCD
MODULE
 1
2
A
  INVERTER
HOT :  (PINK)
COLD : (WHITE)
ITEM                  SYMB             MIN                TYP                  MAX             UNIT           NOTE
Lamp Current
I
L
(1)
Startup Voltage
V
S
   -
-
V
rms
(5)
mA
rms
Operating Life Time
H
r
12,000
Hour
20,000
-
(4)
825 (25
°
C)
Lamp Voltage                V
L
Frequency                       f
L
KHz
-
W
Power Consumption 
P
L
-
(3), I
L
=6mA
 (2)
990  (0
°
C)
V
rms
I
L
=6mA
2.0
6.0
7.0
490
-
-
65
80
45
2.94