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With touch products gaining popularity,
almost all operating systems present
themselves in graphic interface. Within such
graphic interface, some graphics, however,
are usually smaller. Taking Windows for
example, the icons in the notification area
and the minimize/maximize/close buttons at
the upper right corner of an open window are
all smaller than most of the others in the
same operating system. These smaller images
are quite easily clickable when you are
using a mouse while it would usually take
you great effort to precisely tap on it on a
touchscreen. Hence, when you are using a
touchscreen for input device, the precision
of touchscreen plays an important role for
your efficient work. Precision makes you
operate fast and correctly.
Since the resistive touchscreens of 4-, 8-,
and 5-wired are slightly different from each
other as circuiting is concerned, and also
due to the difficulty in making ITO evenness
equal on each touchscreen to make them have
the same linearity, we suggest that you
execute 4- or 9-point calibration for each
new item that you are starting to use for
the first time, so as to make the linearity
and the precision of the action area of the
whole touchscreen accurate. PenMount makes
the calibration points move inward due to
the following considerations:
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For 4- and 8-wired resistive
touchscreens, due to the theory,
material and design, it is very likely
for un-linearity to come up if users
operate along the area between the
viewing area and the silver trace area
at the frame. Such un-linearity is the
so-called “edge effect”. For prevention,
we move the calibration points inward to
reduce the occurrence.
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For 5-wired resistive touchscreen, the
edge linearity differs from brand to
brand due to different circuit designs.
On certain 5- wired products, their edge
linearity appears curving inward which
leads to the inaccuracy when calibration
value is accessed. Since this would
rather deteriorate the precision of the
whole touchscreen, we move the
calibration points inward to make each
calibration point we reach more equal.
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If all calibration points locate around
the edge of the viewing area, the bezel
on and around touchscreen will obstruct
users from accurately tapping on the
points. Moving the calibration points
inward can avoid such annoyance.
For resistive touchscreens, the situation of
touchscreen drift caused by the aging of
touchscreen due to environment temperature
changes and long time work can be improved
through your execution of 16- or 25-point
calibration. The more points you pick for
calibration reference, the more accuracy the
touchscreen will achieve. Starting from
version V2.1.0.187, PenMount Windows
Universal Driver moves the calibration
points inward while the accuracy for outer
edge is maintained by the edge compensation
through the calculation of mathematical
algorithm. Our newest driver V2.2.0.283 can
fit all resistive touchscreen brands from
various manufacturers and helps your
touchscreen reach the best linearity. Your
downloading is welcome.
PenMount's hardware and software are
designed to meet the needs and demands of
the market; and if you have any specific
requirements of your own, we would be most
glad and ready to offer our full support and
assistance in your product development. For
more information on the PenMount hardware
and software products, you can download its
data sheet and drivers via
www.salt.com.tw or
www.penmount.com. If you have any
suggestions or comments, please email us at
salt@salt.com.tw or
penmount@seed.net.tw. |
