LC470EUF
Product Specification
Table 3. ELECTRICAL CHARACTERISTICS (Continue)
Values
Parameter
Symbol
Unit
Note
Min
Typ
Max
Backlight Assembly :
Anode #1,#2
Cathode
IF (anode)
IF (cathode)
VF
mAdc
mAdc
Vdc
Vdc
W
400
100
±5%
Forward Current
(one array)
2, 3
95
105
56
Forward Voltage
4
5
6
46.4
51.2
Forward Voltage Variation
Power Consumption
Burst Dimming Duty
Burst Dimming Frequency
LED Array : (APPENDIX-VI)
Life Time
△VF
1.7
89.6
100
182
PBL
74.2
1
81.9
-
On duty
1/T
%
Hz
8
7
95
30,000
50,000
Hrs
The design of the LED driver must have specifications for the LED array in LCD Assembly.
Notes :
The electrical characteristics of LED driver are based on Constant Current driving type.
The performance of the LED in LCM, for example life time or brightness, is extremely influenced by the
characteristics of the LED Driver. So, all the parameters of an LED driver should be carefully designed.
When you design or order the LED driver, please make sure unwanted lighting caused by the mismatch of the
LED and the driver (no lighting, flicker, etc) has never been occurred. When you confirm it, the LCD–
Assembly should be operated in the same condition as installed in your instrument.
1. Electrical characteristics are based on LED Array specification.
2. Specified values are defined for a Backlight Assembly. (2 LED array/LCM)
3. Each LED array has 2 anode terminals and 8 cathode terminals.
The forward current(IF) of the anode terminal is 400mA and it supplies 100mA into 4 strings, respectively
1string(8 LED PKG)
400mA
Cathode #1
° ° °
° ° °
100mA
Anode#1
Cathode #4
100mA
1 LED Array (8 Strings)
400mA
Cathode #5
° ° °
° ° °
100mA
Anode#2
Cathode #8
100mA
4. The forward voltage(VF) of LED array depends on ambient temperature (Appendix-VI)
5. ΔVF means Max VF-Min VF in one Backlight. So VF variation in a Backlight isn’t over Max. 1.7V
6. Maximum level of power consumption is measured at initial turn on.
Typical level of power consumption is measured after 1hrs aging at 25 ± 2°C.
7. The life time(MTTF) is determined as the time at which brightness of the LED is 50% compared to that of
initial value at the typical LED current on condition of continuous operating at 25 ± 2°C, based on duty 100%.
8. The reference method of burst dimming duty ratio.
It is recommended to use synchronous V-sync frequency to prevent waterfall
(Vsync x 1 =Burst Frequency)
Though PWM frequency is over 182Hz (max252Hz), function of backlight is not affected.
7 /40
Ver. 1.5
LG [ LG SEMICON CO.,LTD. ]
