Touch device

A non-transitory computer-readable medium storing logic, the logic configured to, when executed by a processor, cause the processor to perform operations comprising:

• causing a display of a display stack to generate an image;
• providing voltages to a first plurality of nodes, respectively, of a first column of a plurality of columns of a ground layer of the display stack such that a sum of the respective voltages of the first plurality of nodes of the first column is substantially zero;
• and
• measuring, to determine whether a touch event occurred, respective values at a second plurality of nodes of a second column of the plurality of columns, the respective values at the second plurality of nodes indicating an amount of charge transferred from the first plurality of nodes to the second plurality of nodes.

A device comprising:

• one or more processors;
• and
• one or more memory units coupled to the one or more processors, the one or more memory units collectively storing logic configured to, when executed by the one or more processors, cause the one or more processors to perform operations comprising:
• generating an image for a display of a display stack;
• providing voltages to a first plurality of nodes, respectively, of a first column of a plurality of columns of a ground layer of the display stack such that a sum of the respective voltages of the first plurality of nodes of the first column is substantially zero;
• and
• measuring, to determine whether a touch event occurred, respective values at a second plurality of nodes of a second column of the plurality of columns of the ground layer, the respective values at the second plurality of nodes indicating an amount of charge transferred from the first plurality of nodes to the second plurality of nodes.