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參數(shù)資料
| 型號： | LQ181E1LW31 |
| 英文描述： | TFT Displays|Product Specifications |
| 中文描述： | 液晶顯示技術|產(chǎn)品規(guī)格 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 557K |
| 代理商： | LQ181E1LW31 |
LD-13Z04-10
6-2. Back light driving
The back light system is an edge-lighting type with six CCFTs (Cold Cathode Fluorescent Tube). The
characteristics of the lamp are shown in the following table. The value mentioned below is at the case of one
CCFT.
CCFT Model Name : MBT26B19RX376NRBU(HARISON TOSHIBA LIGHTING Corp.)
Parameter
Symbol
Min.
Typ.
Lamp current range
I
L
2.5
6.0
Lamp voltage
V
L
-
715
Lamp power consumption
P
L
-
4.3
Lamp frequency
F
L
35
60
-
-
Kick-off voltage
Vs
-
-
Lamp life time
T
L
50000
-
Max.
7.0
-
-
70
1300
1500
-
Unit
mArms
【
Note1
】
Vrms
Ta=25
℃
W
【
Note2
】
KHz
【
Note3
】
Vrms
Ta=25
℃【
Note4
】
Vrms
Ta=0
℃【
Note4
】
hour
【
Note5
】
Remark
【
Note1
】
A lamp can be light in the range of lamp current shown above.35
～
70
Maximum rating for current is measured by high frequency current measurement equipment connected to
V
LOW
at circuit showed below. (Note : To keep enough kick-off voltage and necessary steady voltage for
CCFT.)
Lamp frequency: 35
～
70KHz Ambient temperature: 0
～
50
℃
【
Note2
】
Referential data per one CCFT by calculation ( I
L
× V
L ) .
The data don’t include loss at inverter.
【
Note3
】
Lamp frequency may produce interference with horizontal synchronous frequency, and this may cause
beat on the display. Therefore lamp frequency shall be detached as much as possible from the horizontal
synchronous frequency and from the harmonics of horizontal synchronous to avoid interference.
【
Note4
】
Kick-off voltage value is described as the index in the state of lamp only.
The kick-off voltage is estimated to be risen up as approx. +200V in the state of module only, and the
further rise up can be seen according to the assembling status of user cabinet.
Please set the kick-off voltage of inverter to avoid the lighting failures in the state of operation. Please
design the inverter so that its open output voltage can be connected for more than 1 second to startup.
Otherwise, the lamp may not be turned on. But, please set as 100ms when the ambient luminance around
the lamp is more than 1lux.
【
Note5
】
Lamp life time is defined as the time when either 1 or 2 occurs in the continuous operation under the
condition of Ta=25
℃
and I
L
=6.0 mArms.
1.
Brightness becomes 50% of the original value under standard condition.
2.
Kick-off voltage at Ta=0
℃
exceeds maximum value, 1500 Vrms.
《
Note
》
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. 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 occurs.
When you confirm it, the module should be operated in the same condition as it is installed in your instrument.
Module
Inverter
Ａ
～
2
1
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