LC470EUF datasheet(7/40 Pages) LG

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Product Specification

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LC470EUF

Ver. 1.5

Table 3. ELECTRICAL CHARACTERISTICS (Continue)

The design of the LED driver must have specifications for the LED array in LCD Assembly.

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(I

F) of the anode terminal is 400mA and it supplies 100mA into 4 strings, respectively

4. The forward voltage(V

F) of LED array depends on ambient temperature (Appendix-VI)

5. ΔV

F 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.

Parameter

Symbol

Values

Unit

Note

Min

Typ

Max

Backlight Assembly :

Forward Current

(one array)

Anode #1,#2

F (anode)

400

mAdc

±5%

2, 3

Cathode

F (cathode)

100

105

mAdc

Forward Voltage

46.4

51.2

Vdc

Forward Voltage Variation

△V

1.7

Vdc

Power Consumption

74.2

81.9

89.6

Burst Dimming Duty

On duty

100

Burst Dimming Frequency

1/T

182

LED Array : (APPENDIX-VI)

Life Time

30,000

50,000

Hrs

Notes :

° ° °

Anode#1

1string(8 LED PKG)

Cathode #1

1 LED Array (8 Strings)

Cathode #4

Cathode #8

Anode#2

° ° °

Cathode #5

400mA

100mA

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