Product Specification

LP156WF4

Liquid Crystal Display

Ver. 1.1

Apr. 17, 2014

7 / 39

3-2. LED Backlight Electrical Characteristics

Table 3. LED B/L ELECTRICAL CHARACTERISTICS

Parameter

Symbol

Values

Unit

Notes

Min

Typ

Max

LED Power Input Voltage

6.0

12.0

21.0

V

1

LED Power Input Current

-

285

295

mA

2

LED Power Consumption

-

3.4

3.5

W

LED Power Inrush Current

-

-

1.5

A

3

PWM Duty Ratio

1

-

100

%

4

PWM Jitter

0

-

0.2

%

5

PWM Frequency

200

-

1000

Hz

6

PWM

High Level Voltage

V

PWM_H

2.2

-

5.3

V

Low Level Voltage

V

PWM_L

0

-

0.6

V

LED_EN

High Voltage

2.2

-

5.3

V

Low Voltage

0

-

0.6

V

Life Time

12,000

-

-

Hrs

7

Note)

1. The measuring position is the connector of LCM and the test conditions are under 25℃.

2. The current and power consumption with LED Driver are under the V

and White pattern with the normal frame frequency operated(60Hz).

3. The V

4. The operation of LED Driver below minimum dimming ratio may cause flickering or reliability issue.

5. If Jitter of PWM is bigger than maximum, it may induce flickering.

6. This Spec. is not effective at 100% dimming ratio as an exception because it has DC level equivalent to 0Hz.

In spite of acceptable range as defined, the PWM Frequency should be fixed and stable for more consistent

brightness control at any specific level desired.

7. The life time is determined as the time at which brightness of LCD is 50% compare to that of minimum

value specified in table 7. under general user condition.

10%

90%

0.5ms

12.0V

0V

Rising time