Peratech puts touch sensor behind display to save battery life
1 min read
In a move intended to extend battery life in portable devices with OLED screens, Peratech has used its QTC Ultra Sensor technology to allow a touch screen interface to be placed behind the display, rather than in front. Because the sensor is behind the screen, there is no loss of light and longer battery life.
David Lussey, Peratech's cto, said: "By putting the sensor behind the display, there is no light loss at all. 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."
QTC Ultra Touch Screen uses Peratech's Quantum Tunnelling Composite (QTC) technology. QTC is anisotropic and changes its resistance when pressure is applied and only at the point where pressure is applied. QTC material has nano-sized particles of conductive material evenly distributed in a non-conductive polymer. When a force is applied, the particles move close enough for electrons to flow between the particles. A deflection of 1µm or so is needed to sense a touch through the layers of glass and display.
The layer of Quantum Tunnelling Composite (QTC) is printed as a QTC ink on the back of the display as required by the product designer.
