2-7
• To prevent touchscreen breakage, there should be a compliant gasket
between the back of the touchscreen and the front of the display to all o w for
variation in the surfaces when assembling. A gap is also r equire d betwe en the
touchscreen and the face of an LCD display to prevent damage to the display.
• Unlike CRT's, plasma, EL, and backlit LCD displays may be a significant
source of heat. The situation may be more significant if the unit is sealed.
Any installation must avoid heat rise that exceeds the touchscreen
specification.
Bezel Design
The following graphic displays some bezel ideas in order to help you mount the
bezel to the touchscreen.
Figure 2.1
Bezel design
Even on a beveled touchscreen,
the transducer sticks up 1mm
above the glass. Add a spacer
to ensure clearance. Seal
thickness will not suffice.
With thick
bezel, mill
out hole for
transducer
wedge.
Transducer
Wedge
Bezel
Hard
Lip
With thin bezel,
add a 2-3mm
hard lip to
protect
transducer
wedge.
Before
Compression After
Compression
Another idea:
Add a hard lip
behind the seal
to control
compression.