Apparatus for piezoelectric force detection

A device, comprising:

• a cover layer, of a plurality of layers, to receive a touch force applied to the device;
• a capacitive touch set of layers to determine a location of the touch force;
• and
• a force determination set of layers, of the plurality of layers, configured to determine a magnitude of the touch force applied to the device,
• the force determination set of layers being disposed between the cover layer and a display of the device,
• the force determination set of layers including:
• a piezoelectric layer with a set of force determination pixels,
• the set of force determination pixels being arranged in a matrix, with a set of rows and a set of columns, to address the set of force determination pixels,
• a force determination pixel, of the set of force determination pixels, to generate a charge for determining the location, relative to the set of rows and the set of columns, of the touch force applied to the device and a magnitude of the touch force applied to the device,
• where the capacitive touch set of layers and the force determination set of layers further comprise:
• a set of first amplifiers capacitively coupled to corresponding rows, of the set of rows, to excite each row with a touch transmit waveform,
• a set of second amplifiers capacitively coupled to corresponding columns, of the set of columns, to read out the touch transmit waveforms,
• a set of switches corresponding to the set of columns to connect a set of third amplifiers to a corresponding column, of the set of columns, during force readout when the touch transmit waveform is not being provided.

An apparatus, comprising:

• a cover layer, of a plurality of layers, to receive a touch force applied to the apparatus;
• a capacitive touch set of layers to determine a location of the touch force;
• and
• a force determination set of layers, of the plurality of layers, configured to determine a magnitude of the touch force applied to the apparatus,
• a display of the apparatus being disposed between the force determination set of layers and the cover layer,
• the force determination set of layers including:
• a piezoelectric layer with a set of force determination pixels,
• the set of force determination pixels being arranged in a matrix, with a set of rows and a set of columns, to address the set of force determination pixels,
• a force determination pixel, of the set of force determination pixels, to generate a charge for determining a location, relative to the set of rows and the set of columns, of the touch force applied to the apparatus and a magnitude of the touch force applied to the apparatus,
• where the capacitive touch set of layers and the force determination set of layers further comprise:
• a set of first amplifiers capacitively coupled to corresponding rows, of the set of rows, to excite each row with a touch transmit waveform,
• a set of second amplifiers capacitively coupled to corresponding columns, of the set of columns, to read out the touch transmit waveforms,
• a set of switches corresponding to the set of columns to connect a set of third amplifiers to a corresponding column, of the set of columns, during force readout when the touch transmit waveform is not being provided.