Siemens SIMATIC HMI IPC677C Operating Instructions Manual page 15

Defective pixels in the display
At present, the manufacturing process of modern displays does not guarantee that all pixels
of the display will be perfect. A small number of defective pixels in the display is therefore
unavoidable. This does not present a functional problem as long as the defective pixels are
not bunched in one location.
Further information is available in the section "General technical data" of the "Technical
data" chapter.
Backlighting
The brightness of the backlighting decreases incrementally during its operational life. In
order to not shorten the operational lifetime of the backlighting unnecessarily, activate the
backlighting reduction.
Burn-in effect on TFT displays
An image may occasionally leave a burn-in effect in the background if it appears too long on
the screen. This burn-in effect will automatically disappear after a certain amount of time if,
for example, the screen saver is activated. The longer the same image is displayed on the
screen, the longer it will take for the burn-in effect to disappear.
Screen saver
Generally, you should always activate the screen saver. If a screen saver is activated,
please observe the following:
● The liquid crystals in screen savers which actuate active black when the backlighting is
● Screen savers that reduce the backlighting extend the life span of the backlighting.
● Screen savers that switch off the backlighting shorten the life span of the backlighting.
Consider the following carefully:
● Screen saver
● Switch off the backlighting regularly
● Permanent display of the customer application
SIMATIC HMI IPC677C
Operating Instructions, 04/2013, A5E02722710-04
on renew themselves. Pay attention to the length of time the backlighting is activated.
Safety
1.2 General Information
15