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Saia-Burgess Controls AG
6.4
Backlight Control
This function helps you saving energy. When the Backlight is deactivated, you save
about 3/4 Watts. That is not negligible. Not only, the Backlight lifetime is saved resp.
increased.
CCFL and LED backlight.
According to the types of MB-Panels, the backlight technology is CCFL or LED
Types
PCD7.D457BTCF
PCD7.D457STCF
PCD7.D457SMCF
PCD7.D457VTCF(H)
PCD7.D457VMCF
PCD7.D410VTCF
With CCFL Backlight (Cold Cathode Fluorescent Light), which is similar to a standard
«Neon» tube light, a gas powers the light under AC voltage which is provided by an
inverter circuit. When it is cold the gas doesn't start as easily as in normal tempera-
ture conditions. It is why with cold temperature the number of Backlight switching
must be reduced in order the save the lifetime.
LED backlighting light-emitting diodes)is most commonly used in small LCD panels.
The light is usually colored, although white LED backlighting is becoming more com-
mon. Dimming is easier than with CCFL backlight.
Backlight Lifetime?
The typical (@25°C) backlight lifetime is defined around 50 Khrs.
That means more than 5 years permanently switch on. BUT, we can quickly reduce
(divided by 2 or more) this value if the operating temperature is about 10 °C or less,
especially with CCFL Backlight type. The user or programmer must be aware of the
Backlight timeout if he wants to increase the lifetime.
Manual PCD7.D4xx │ D ocument 26-851 ENG12 │ 2 016-02-05
Backlighting
LED
CCFL
CCFL
LED
LED
CCFL / New is LED
Update & special settings
Backlight Control
6
6-5
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