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Mounting the Touchscreen
When preparing the touchscreen for mounting to the LCD, major considerations
are:
• Reasonable mechanical alignment with the display.
• Mounting materials and methods.
• A complete dust seal between the touchscreen and the LCD.
• A mounting technique that evenly supports the touchscreen on at least two
opposite edges. Elo recommends double-sided tape on all sides of the LCD.
• Creating enough space between the touchscreen and the bezel to
accommodate the touchscreen and the transducers. Adequate spacing can
normally be accomplished by:
1 trimming or milling the inside of the bezel.
2 using spacers to move the LCD back in the chassis.
3 using spacers to move the bezel away from the touchscreen. A
combination of moving the LCD back with spacers and trimming the bezel
is the usual solution.
• The seal between the touchscreen and the display bezel.
The last three considerations listed above should determine the nominal
thickness of the spacers to be used.
Many monitors will have sufficient space in the bezel to allow the touchscreen
face to rest against the lip of the bezel, with the lip touching the active region of
the touchscreen. However, the transducers should not be in contact with the
bezel. Assuming double-sided tape is used to attach the touchscreen to the LCD
the final spacing will be determined by the type of seal to be used. See
“Sealing” on page 2-41, for an explanation of sealing methods.
Before mounting the touchscreen, clean the face of the display and the back of
the touchscreen with household glass cleaner. Be sure to remove all
fingerprints. The space between the touchscreen and the display face must be
clean and free of any foreign objects.
Mount the touchscreen as follows:
• Layer the double-sided adhesive tape to achieve a total thickness of 1/16-inch
(2 mm); across the entire top, bottom, and sides on the rear of the
touchscreen. In general, the adhesive tape should be set back slightly from
the edge of the active area of the touchscreen. When the display is
reassembled, the mounting tape should not be visible. Make sure that the
double-sided adhesive tape butts in the corners to form a dust seal. Do not
remove the liner from the exposed side of the adhesive tape yet.