Product Specification

LM200WD3

Liquid Crystal Display

Ver. 0.1

Apr., 20, 2012

7 / 32

Table 3. LED array ELECTRICAL CHARACTERISTICS

LED driver design guide

: The design of the LED driver must have specifications for the LED in LCD Assembly.

The performance of the LED in LCM, for example life time or brightness, is extremely

influenced by the characteristics of the LED driver.

So all the parameters of an LED driver should be carefully designed and output current

should be Constant current control.

Please control feedback current of each string individually to compensate the current

variation among the strings of LEDs.

When you design or order the LED driver, please make sure unwanted lighting caused by

the mismatch of the LED and the LED driver (no lighting, flicker, etc) never occurs.

When you confirm it, the LCD module should be operated in the same condition as

installed in your instrument.

Notes :

1. The specified values are for a single LED bar.

2. The specified current is defined as the input current for a single LED string with 100% duty cycle.

3. The LED life time is defined as the time when brightness of LED packages become 50% or less

than the initial value under the conditions at Ta = 25  2°C and LED string current is typical value.

4. The power consumption shown above does not include loss of external driver.

5. LED operating conditions must not exceed Max. ratings.

Parameter

Symbol

Condition

Values

Unit

Note

s

Min.

Typ.

Max.

LED String Current

Is

-

120

125

mA

1,2,5

LED String Voltage

Vs

38.4

41.0

43.6

V

1,5

Power

Consumption

-

9.8

10.5

Watt

1,2,4

LED Life Time

LED_LT

30,000

-

-

Hrs

3

Notes) The LED Bar consists of 26 LED packages, 2 strings (parallel) x 13 packages (serial)