TFT-tech-based matrix sensor overcomes false touch issues
The active matrix sensor uses the same principles as TFT display backplanes to overcome the issues of “ghost” or false touches that Peratech says are 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. 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.
With Quantum Tunnelling Composite (QTC) technology, QTC materials change from being an almost perfect insulator to becoming increasingly conductive in proportion to the amount of force applied to them. The materials are very robust and resilient, so that changes in resistance due to even the slightest pressure are both predictable and repeatable over more than a million cycles. The company asserts that its technology makes touch buttons, panels and displays far easier to use.
Peratech; www.peratech.com
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