MICRO PANEL
Device description GF0
Display
Technical subject to change
M000235-01.DOC
© by Micro Innovation
27
14 D
ISPLAY
The different versions of the Micro Panel GF0 are available with different display technologies.
Passive LCD, monochrome or color screens are available as well as monochrome electroluminescent
(EL) displays.
EL displays generate the image by means of active electroluminescent yellow pixels, thus making a
backlight unnecessary.
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 (
→
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 GALILEO design software.
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