Active matrix sensor takes force input on touch-screen

May 19, 2017 // By Julien Happich
During SID Display Week 2017, Peratech will profile its active matrix sensor and other force / touch solutions based on its Quantum Tunnelling Composite (QTC) technologies.

The active matrix sensor uses the principles of TFT display backplanes to overcome the issues of “ghost” or false touches associated with many matrix sensors. The compatibility between TFT backplane and QTC allows active matrix connectivity to QTC touch sensors, overcoming resolution, cross-talk and ghosting issues. Furthermore, the ability to print QTC sensels in a layered construction that can be combined with the manufacture of TFT backplanes, offers a solution that is affordable in consumer applications.

Peratech’s touch sensors based on Quantum Tunnelling Composites are supplied in the form of a polymer membrane as thin as 50 µm. The sensors can be applied under displays and along the edges and on the backs of handheld consumer electronic devices. 3D touch is achieved with sensor arrays determining X-Y position through touch and applied force in the Z-axis. The active matrix sensor can be configured for resolutions down to 0.5 mm sensels with 0.8 µm spacing on glass.

Used under a display, Peratech’s sensors can sense the force applied across the screen and compute the touch pressure for individual zones or functions. They can also provide discrete pressure buttons in regions that match the graphical user interface layout.

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