Touch screen technology goes behind the display
The QTC Ultra Sensor is so sensitive that it can be placed behind the OLED display and still detect finger touches on the front of the display to create a touch screen interface. By positioning the touch screen sensor behind the display, there is no loss of light from the display enabling the battery life to be longer. Currently, sensors go over the display and absorb light which has to be compensated for with a brighter setting for the display and that uses up more battery life.
The QTC Ultra Sensor works best with OLED and e-paper type displays, which are becoming increasingly popular, although it can be used with other display technologies providing they can be pressed. The sensors rely on Peratech’s Quantum Tunnelling Composite (QTC) anisotropic material which changes its resistance at the point where pressure is applied. A deflection of a micron or so is needed for QTC Ultra to sense the touch through the layers of glass and display. The solution provides not only multi-touch x and y co-ordinates but also z according to the amount of pressure applied enabling new gesture inputs to be created. The layer of QTC material is printed as a QTC ink on the back of the display as required by the product designer.
Visit Peratech at www.peratech.com