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參數(shù)資料
| 型號： | LTM170E4 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | COLOR ACTIVE MATRIX TFT LIQUID CRYSTAL DISPLAY |
| 中文描述： | 色有源矩陣TFT液晶顯示器 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大小： | 746K |
| 代理商： | LTM170E4 |
Doc . No
PI004_LTM170EU-L11
Page
11
/24
3.2
BACK-LIGHT UNIT
The back-light system is an edge - lighting type with 2 dual CCFTs ( Cold Cathode
Fluorescent Tube ) The characteristics of two dual lamps are shown in the following tables.
Ta=25 ± 2°C
Item
Symbol
I
L
V
L
f
L
Min.
3.0
-
50
Typ.
6.5
650
-
Max.
7.0
-
60
Unit
mArms
Vrms
kHz
Note
(1)
Lamp Current
Lamp Voltage
Lamp Frequency
(2)
Startup Voltage
Vs
-
-
0
℃
: 1,800
25
℃
: 1,500
Vrms
(3)
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.
it, the module should be operated in the same condition as it is installed in your instrument.
When you confirm
Note (1) Lamp current is measured with current meter for high frequency as shown below.
Refer to the block diagram of the back-light unit in the next page for more information.
Specified values are for a single lamp.
LCD Module
Inverter
(SK1700)
A
Hot(Red)
Cold(White)
Hot(Blue)
Cold(Black)
Hot(Red)
Cold(White)
Hot(Blue)
Cold(Black)
(2) Lamp frequency may produce interference with horizontal synchronous frequency which 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) If an inverter has shutdown function it should keep its output for more than 1 second even if
the lamp connector open.
Otherwise the lamps may not to be turned on.
(4) Because the inverter uses high voltage, please disconnect it from the power before
assembling or disassembling.
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