Device Description MV4-150-TA1, MV4-450-TA1, MV4-170-TA1, MV4-470-TA1 1-23
Moeller 07/01 AWB-C2700-1347GB
14 Display
The different versions of the Touch Operator Panel are available with different display technologies. Passive
LCD, monochrome or color screens are available.
The individual pixels of an LCD display are not actively illuminated. The image is produced by illuminating
the screen by a backlight which is varied in colour and intensity by means of the individual LCD cells (pixels).
The light of this backlight is provided by a cold cathod tube. The lifespan of these tubes (see Section 17) is
limited and depends on the operating conditions at hand. The brightness setting of the backlight and the
number of switch-on cycles will determine the lifespan of the screen. Reducing the brightness can
significantly increase the lifespan of the LCD display. Frequent switching, especially at low temperatures will
reduce the lifespan.
Therefore avoid frequent switching on and off of the backlight or the entire system. Reducing the brightness
to a minimum setting is better than frequently switching the display on and off.
Particularly with LCD displays the image contrast depends on the viewing angle. The operating temperature
also has a direct influence on the contrast and consequently also on the viewing angle. Any detrimental
influences caused by temperature are reduced by an additional circuit in the device (partial compensation).
The contrast (contrast voltage) may need to be adjusted due to the viewing angle requirements of different
people or changes in the ambient temperature. This can be carried out on the Touch Panel by the operator.
Further information on adjusting the brightness of the backlight and the contrast is provided in the
documentation of the MV4-configurator.
15 Maintenance and repair
The Touch Operator Panels are maintenance-free.
The inside of the device front panel should be cleaned regularly to ensure trouble-free IR touch screen
operation (see Section 13.3).
Repairs to the units must only be carried out by the manufacturer.
Modifications made to the device that are not described in this document are not permitted and no liability will
be accepted for them.
16 Disposal
Touch Operator Panels that are no longer used must be disposed of properly or returned to the manufacturer
for disposal.
Special note:
– The clock module contains a sealed lithium battery.
(Real Time Clock, Dallas DS12887 or STMicroelectronics M48T86PC1)
– The backlights for units with LCD displays are provided by fluorescent tubes that contain mercury.
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