ACM4004H-FL-YBW-R (AZ DISPLAYS) CHARACTER MODULE VER1.0

AZ DISPLAYS

4

3.2 The Characteristics Of LED Backlight

3.2.1 Electrical-Optical Characteristics Of LED Backlight (Ta=25ºC)

Item

Symbol

Condition

Min

Typ

Max

Unit

Forward Voltage

(1)

Vf

If=500mA

(5)

3.9

4.2

4.5

V

Reverse Voltage

Vr

-

--

--

8

V

Luminance

(2)

Lv

If=500mA

250

300

350

cd/㎡

Uniformity

(3)

Δ

(Lvmin/Lvmax)%

70%

--

--

-

Peak wave length

λp

If=500mA

570

--

575

nm

Lifetime

(4)

-

If=500mA

-

20000

-

Hours

NOTE:

(1) Forward voltage means voltage applied directly to the LED, please refer to the backlight diagram.

(2)The luminance is the average value of 5 points, The measurement instrument is BM-7 luminance

colorimeter. The diameter of aperture is Φ5mm

(3) Luminance means the backlight brightness without LCD.

(4) Backlight lifetime means luminance value larger than half of the original after 20000 hours’ continuous

working.

(5) Please apply the backlight current as the table recommend. If LCM surface luminance is acceptable,

please apply the driving current as lower as possible. Any time, do not apply the driving current higher than 550mA.

3.2.2 Backlight Control Circuit for LCM（2x50=100 pcs LED）

17(

18(

Vf

NOTE :RL1 RL2 PACKAGE SIZE IS 1206

3.2.3 LED Typical Electro-Optical Characteristics Curve（for single led）

1. Forward current vs. Ambient temperature

2. Forward current vs. Forward voltage