Acer AL1716W Servicehandleiding - Pagina 12

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Note (2) Input Rush Current measurement condition

2.8 Back-Light Unit

The back- light system is an edge-lighting type with 2

CCFL. The characteristic of the lamp is shown in the

following tables.

Item

Symbol

Lamp current

Lamp voltage

Frequency

Operating lamp life time

Startup voltage

Note (1) Lamp current is measured with current meter

for high frequency as shown below. Specified

valued are for single lamp.

Note (2) Lamp frequency may produce interference

with horizontal synchronous frequency and

this may cause ripple noise on the display.

Therefore lamp frequency shall be kept away

from the horizontal synchronous frequency

and its harmonics as far as possible in order

to avoid interference. *Suggest the inverter

frequency avoid fL=51~59KHz

Note (3) Lamp life time (Hr) can be defined as the time

in which it continues to operate under the

condition: Ta=25 3 oC, typical IL value

indicated in the above table and fL=52kHz

until the brightness becomes less than 50%.

Note (4) CCFL inverter should be able to provide a

voltage over specified value (Vs) in the above

table. Lamp units need at least Vs value

shown above to ignition.

2. Flat Panel Specification (continued)

Min.

Typ. Max.

Unit

Note

3.0

8.0

9.0

mA(rms)

(1)(6)

610

V(rms)

(6) IL=8.0mA

KHz

(2)

30,000

Hour

(3) IL=8.0mA

40,000

Hour

(3) IL=7.5mA

1200

(4)(5) at 25oC

V(rms)

1400

(4)(5) at 0oC

Note (5) The voltage over specified value (Vs) should

be applied to the lamp more than 1 second

after startup. Otherwise, the lamp may not be

turned on. The used lamp current is the lamp

typical current.

Note (6) The output voltage waveform and current

waveform of the inverter must be symmetrical

(Unsymmetrical ratio is less than 10%).

Please do not use the inverter which has

unsymmetrical voltage and current waveform,

and spike waveform. The inverter design

which can provide the best optical

performance, power efficiency, and lamp life

should under the following conditions.

a. The asymmetry rate of the inverter

waveform should be less than 10%.

b. The distortion tae of the waveform should

be within

c. The inverter output waveform should be

better similar to the ideal sine wave.

2.9 Switching Characteristics for LVDS Receiver

ACER AL1716W

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