LM240WU8
Liquid Crystal Display
Product Specification
Table 2-2 . LED Bar ELECTRICAL CHARACTERISTICS
Values
Typ.
Parameter
Symbol
Condition
Unit
Notes
Min.
Max.
LED :
1,7
2,7
LED String Current
LED String Voltage
Power Consumption
LED Life Time
Is
Vs
-
46.4
-
110
51.2
22.5
-
120
56.0
24.6
-
mA
V
3,7
PBar
Watt
Hrs
4,6,7
5,7
LED_LT
30,000
LED driver design guide
1) The design of the LED driver must have specifications for the LED in LCD Assembly.
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 and output current should be
Constant current control.
Please control feedback current of each string individually to compensate the current variation
among the strings of LEDs.
When you design or order the LED driver, please make sure unwanted lighting caused by
the mismatch of the LED and the LED driver (no lighting, flicker, etc) never occurs.
When you confirm it, the LCD module should be operated in the same condition as installed in
your instrument.
2) LGD recommend that Dimming Control Signal ( PWM Signal) is synchronized with Frame Frequency
for Wavy Noise Free.
1. Specified values are for a single LED bar.
2. The specified current is input LED chip 100% duty current.
3. The specified voltage is input LED string and Bar voltage at typical 110 mA 100% duty current.
4. The specified power consumption is input LED bar power consumption at typical 110 mA 100% duty current.
5. The life is determined as the time at which luminance 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.
6. The LED bar power consumption shown above does not include loss of external driver.
The used LED bar current is the LED typical current.
Min Power Consumption is calculated with PBar = Vs(Min.) x Is(Typ.) x Nstring
Max Power Consumption is calculated with PBar = Vbar(Max.) x Is(Typ) x Nstring
7. LED operating DC Forward Current must not exceed LED Max Ratings at 25
2
C
Ver. 0.0
Apr, 07, 2011
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LG [ LG SEMICON CO.,LTD. ]
