Date: 16th May 2011
Resistive touch panel controller from
Fujitsu supports dual touch
Fujitsu Components America Inc. said it will demonstrate
its new, dual-touch (2 point), 4-wire analog resistive touch
panel controller at Display Week 2011 in Los Angeles.
Fujitsu said it latest development consists of a dual-touch
(2-point) controller IC that supports USB and I2C interfaces,
and offers Windows7 and Android drivers. This new development
makes it possible for 4-wire resistive touch panels to accurately
detect two simultaneous touch points, enabling the pinch,
expand, rotate, and swipe/flick gestures that have been
popularized by more costly, projected capacitive touch panels,
adds Fujitsu. Last year, Fujitsu released Windows 7-certified
Multi-Input (10 point) touch panels and controller ICs as
series FID1530.
Resistive touch panels accept a wider variety of input
sources, including a pen, finger, stylus, glove or credit
card edge. Adding the 2-point gesturing capability will
bring new functionality and flexibility to touch-based medical
devices, industrial equipment and controls, and mobile consumer
devices, such as eReaders.
Typically, resistive touch panels detect positioning by
measuring the voltage on the resistive films where the panel
surface is pressed. If two or more points are pressed simultaneously,
the detection circuit registers the mean value between those
points and identifies it as a single position, making it
impossible to accurately detect two or more separate points.
Fujitsu's new, proprietary technology is a hardware and
firmware-based method, centered on the dual-touch controller
IC and includes supporting electronics that detects two
simultaneous touches.
The dual-touch controllers are currently sampling now.
Volume production of the controllers and controller boards
will begin in Summer 2011.
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