Displaytech Ltd

LCD MODULE

INT028ATFT / INT028ATFT-TS

Version: 1.0

9

10.Backlight specification

(Vcc=3.3V, Vss=0V, Ta=25°C)

Item

Symbol

Condition

Min

Typ

Max

Unit

Note

Supply voltage

Vf

If=80mA

2.9

3.2

3.5

V

1

Forward current

If

---

---

80

mA

2

Uniformity

ΔBp

If=80mA

80

---

---

%

Color coordination

X

0.270

---

0.315

---

Y

0.270

---

0.315

---

LED circuit diagram:

Constant current If=4x20mA=80mA; Vf=3.2V(typ)

Note:

1) As there has built-in PWM control for the backlight, so the backlight driving specification is only applicable

for direct driving.

2) The LED’s driver mode needs to be constant current mode.

3) Permanent damage to the device may occur if maximum values are exceeded. Functional operation should be

restricted to the conditions described under normal operating conditions.

11.Optical Characteristics

(Vcc=3.3V, Vss=0V, Ta=25°C)

Item

Symbol

Condition

Min

Typ

Max

Unit

Note

Brightness

Bp

θ=0º

Ф=0º

180

220

---

cd/m²

1

Uniformity

ΔBp

80

---

---

%

1, 2

Viewing Angle

θ1

(Ф=90°

or 270°)

Cr≥10

-70 ~ 50

deg

3

θ2

(Ф=0°

or

180°)

-70 ~ 70

Contrast ratio

Cr

θ=0º

Ф=0º

400

500

---

---

4

Response Time

Tr

---

25

30

ms

5

Tf

White

x

θ=0º

Ф=0º

0.230

0.280

0.330

---

1, 6

y

0.248

0.298

0.348

Red

x

0.580

0.630

0.680

y

0.279

0.329

0.379

Green

x

0.288

0.338

0.388

y

0.557

0.607

0.657

Blue

x

0.093

0.143

0.193

y

0.025

0.075

0.125

NTSC Ratio

S

---

65

---

---