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3M™MicroTouch™ System DST2270DX Integration Guide
3M Touch Systems, Inc. Proprietary Information – TSD-25739
Parallax, the effect of a target object appearing in different positions when looked at
from different angles, is a common problem in many computer applications. The
combination of the sensor in front of the display and differing heights of users can cause
parallax. When designing your touch system software application, use the following
guidelines to help reduce the effects of parallax.
•
Design large buttons to facilitate touch. Remember that a fingertip is much larger
than a cursor.
•
Design larger active border areas for buttons. For example, if the button graphic is 1
inch x
1 inch, the active touch area behind it could be 2 inches x 2 inches. Be careful
to allow sufficient space between buttons also.
•
Keep buttons away from the edges and corners of the sensor. If this is impossible,
make sure the active touch areas extend to the outer edges of the viewing area.
•
Place buttons horizontally whenever possible. One size does not fit all! Consider the
varying heights of users and thus viewing angles when designing the application.
•
Make sure there is adequate space between buttons so touches do not overlap.
•
Turn off the cursor. Users may inadvertently try to drag the cursor to the correct
location on the sensor, emulating moving a mouse, instead of touching the button
directly.
•
Design your applications to work with a single touch to activate rather than a double-
touch.
Button Graphic
Active Touch Area
