|
In the touch screen field, resistive touch
screen is most commonly used in the market
today. According to market research,
resistive touch screen market share stands
at 86% and can be applied to various types
of applications, such as MID, UMPC, PDA,
Smart Phone, GPS, etc, which commonly use
the 4 wire resistive touch screen. However,
more and more companies are considering the
5-wire touch screen for these types of
applications.
The design of 4-wire and 5-wire touch screen
is different, and the bezel mechanical
design to go with these touch screens could
be different as well. Because of its innate
constitution, there are some hard to
overcome limitations in the resistive touch
screens. For 4-wire touch screen, there is a
forbidden area which is from the active area
to the sliver trace area, user is not
allowed to draw along this area with a
stylus as this could cause damage to the
touch screen. But for a 5-wire touch screen
there is no such forbidden area; however, an
avoidable fact is that the perimeter of the
active area which is about 7% of the border
region of the active area, the linearity of
this perimeter area has a ratio of about +/-
3% inaccuracy.
In the above-mentioned limitations of the
resistive touch screen, PenMount has a
solution. The PenMount team came out with a
new improved calibration software utility by
moving the calibration points inward. . In
the current version of the Advanced
Calibration utility, the calibration points
are along the border of display area, which
is also the border region of the touch
screen. Therefore, in the new Advanced
Calibration utility, we moved each of the
calibration points 2% inward; and for the
outer region, we incorporated specially
developed mathematical algorithm designs to
enhance the linearity accuracy of the whole
active area of the touch screen. For
example, a 7” LCD panel with resolution
1024x600, after advanced calibration the
distance between cursor and touch point is
less than 1mm. Besides, PenMount new
Advanced Calibration program is still
capable of correcting non-linearity problem.
For example, a 15” touch screen, after using
PenMount Advanced 25-point Calibration
process, a 5cm drift can be corrected to
less than 5mm.
PenMount new Advanced Calibration utility
program is ready and for Windows
2000/XP/Vista and available for download
from our website. The version for Linux
Kernel 2.6 and WinCE will be ready in the
very near future.
For more PenMount controllers and
drivers information, please visit our
websites:
http://www.salt.com.tw and
http://www.penmount.com.
Please feel free to contact us at our email
address salt@salt.com.tw
or service@penmount.com .
 |
