Backlight Unit; Parameter Guideline For Led Backlight - Advantech IDK-1110WR-series User Manual

2.2

Backlight Unit

2.2.1

Parameter guideline for LED backlight

Following characteristics are measured under a stable condition using an inverter at
25°C (Room Temperature):
Parameter
LED Driver voltage
Power Supply Current
For LED Driver
ADJ Input Voltage
LED_EN Voltage
LED voltage
LED current
LED Life Time
Note1 The constant current source is needed for white LED back-light driving.
When LCM is operated over 60 deg.C ambient temperature, the IL of the
LED back-light should be adjusted to 460mA max.
There are 6 Groups LED shown as below, VLEDA-LEDK=9.6V ,Ta=25
Note1 Condition: Ta=25
Life time is estimated data. Definitions of failure:
1.LCM brightness becomes half of the minimum value.
2.LED doesn't light normally.
When LCM is operated over 40
Value
Symbol
Min. Typ.
VLED 4.5 5
ILED - 1.4
V - 3.3
ADJ
V - 3.3
EN
V - 9.6
AKL
I - 540
L
- 460
- - 50K
continuous lighting
°C,
ambient temperature, the ILED should be followed:
°C
11
Unit Note
Max.
5.5 V
- A VLED=5V
VADJ=3.3V
(duty 100%)
VLED V duty=100%
- V
10.8 V I = 540mA,
L
Ta = 25°C
- mA Note1
- mA Note1
- Hour Note2
°C
IDK-1110W User Manual