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hi I'm Morgan from Moto Development
Group a little while ago labs. moto.com
published a story showing how you could
use a downloaded drawing application and
your finger to do a do-it-yourself
touchscreen performance test on existing
smartphones we got a lot of coverage and
a lot of requests to test other phones
that weren't in our original lineup
we've gathered a few of these today and
we're going to show how we do this in
production instead of using a finger we
have a robot here that draws the test
pattern much more slowly and much more
carefully and much more consistently
than a human finger can so we can really
see the True Performance of all of these
different
phones when we're working on production
devices we use the most strenuous tests
we possibly can to illuminate any
possible tweaks that the touch sensor
designer and manufacturer can
incorporate to improve the performance
of the overall
device our robotic test finger is
somewhat harder to sense than a human
finger and thus shows the
holes in the performance of a touch
sensor much more
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easily the Google Nexus One shows a
pretty good performance but take note
that the Gap in the top right corner of
the screen is intentional that's just
not a line that the robot actually draws
during the test
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pattern the HTC Droid ear performs very
similarly to the Google Nexus One
there's some waviness but overall it
tracks pretty
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well just like in our previous DIY test
the Motorola Droid sensor lost the test
finger in several locations with the
signal dropping out completely the lines
are also wavy and unpredictable
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the iPhone shows very straight tracking
in the center of the screen and in this
case we don't see the touches exiting
the screen so we don't see the
nonlinearities which were present in our
handdrawn
test the Palm Prix shows good linearity
with a little bit of waviness but near
the edges of the screen it does show
some inaccuracies
the Blackberry Storm 2 shows moderate
waviness and a couple of tracking errors
at the
edges as you can see there's a
significant range of performance
differences between the variety of
phones that we tested it may not seem
like much but a few millimeters one way
or another can really have a big impact
when using a touchscreen keyboard or
trying to hit a small Target in a
browser when we compare to the
do-it-yourself drawings done with a
finger you'll actually see a great deal
of similarity my finger didn't track as
straight as it could have but ultimately
the performance differences that we
highlighted in that test are borne out
by the
robot touchscreen linearity is just one
of the aspects of the performance of the
overall solution ultimately you have to
tune the software stack the drivers and
the design of the onscreen user
experience to really make things come
together for more information visit our
website at labs. moto.com