Service manual

Note :

1. The specified current and power consumption are under the VLCD=5.0V, 25  2°C,fV=60Hz condition

whereas mosaic pattern(8 x 6) is displayed and fV is the frame frequency.

2. The current is specified at the maximum current pattern.

3. Permissive power ripple should be measured under VCC=5.0V, 25°C, fV (frame frequency)=75Hz condition and

At that time, we recommend the bandwidth configuration of oscilloscope is to be under 20MHz.

4. The duration of rush current is about 5ms and rising time of power Input is 500us 20%.

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. Specified values are for a single LED bar.

2. The specified current is input LED chip 100% duty current.

3. The specified voltage is input LED string voltage at typical 110mA 100% duty current.

4. The specified power consumption is input LED bar power consumption at typical 110mA 100% duty current.

5. The life time is determined as the time at which luminance of the LED is 50% compared to that of initial

value at the typical LED current on condition of continuous operating at 25 2°C.

6. The LED bar power consumption shown above does not include loss of external driver.

The used LED string current is the LED typical current.

Typ Power Consumption is calculated with PBar = Vs(Typ.) x Is(Typ.) x Nstring

Max Power Consumption is calculated with PBar = Vs(Max.) x Is(Typ) x Nstring