Peratech Holdco Limited

Michael Robert Garrett

Joel Erik Christoffer Metelius

Michael D Levin

Themistoklis Afentakis

The detection of multiple manual interactions upon a touch-pad is shown. Drive lines intersect a scan lines and each intersection between a drive line and a scan line includes an element of variable resistance. A scanning processor energises the drive lines and monitors the scan lines. The scanning processor is configured to identify positions of manual interaction, validate identified positions to identify potentially erroneous positions and remove positions identified as erroneous. However, removed positions are re-introduced when they are not in the vicinity of other identified positions.

Detecting multiple manual interactions

Illumination functionality is combined with a touch-sensing functionality. A first electrical conductor and a second electrical conductor are located on a substrate. A pressure-sensitive element () is connected across the conductors and a light-emitting device () is also connected between the conductors. A control circuit alternates between energizing the pressure-sensitive element with current flowing in a first direction and driving the light-emitting device with current flowing in an opposite direction.

Touch-sensitive illumination

A detection element () is energised. The detection element is substantially non-conductive without an application of pressure and becomes increasingly conductive in response to pressure application. A processor () is interrupted from a low-power dissipation state in response to a first detectable application of pressure by the detection-element. The processor is then configured to monitor further pressure applied to the same detection element.

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Stockholm, Sweden

Michael Robert Garrett