ACM1602KC-NLW-BBW-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=15mA

2.9

3.1

3.3

V

Reverse

Voltage

Vr

-

--

--

5

V

Luminance

(2)

Lv

If=15mA

240

300

--

cd/㎡

Uniformity

(3)

Δ

(Lvmin/Lvmax)%

70%

--

--

-

Peak wave length

λp

-

--

--

--

nm

Chroma coordinate

x

If=15mA

0.26

--

0.30

um

y

If=15mA

0.27

--

0.31

um

Lifetime

(4)

-

If=15mA

-

20000

-

Hours

NOTE:

(1) Forward voltage means voltage applied directly to the LED

(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.

3.2.2 Backlight Control Circuit FOR LCM（1x1=1 pcs LED）

150Ω

K

A

16

15

BL

Vf

3.2.3 LED Characteristics Curves（for single led）

1.Forward current VS.Ambient Temperature

25

20

15

10

-30

5

0

100

Ambient Temperature

25

050

80

45

30

3

2

15

20

0

5

10

Forward Voltage

25