Display device and circuit board

A display device comprising:

• a substrate;
• a plurality of first electrodes;
• a plurality of lines;
• a plurality of pixel electrodes;
• a display functional layer;
• a common electrode opposed to the pixel electrodes;
• a plurality of second electrodes;
• a plurality of third electrodes provided between the substrate and the pixel electrodes;
• an analog front-end circuit;
• a switching circuit provided between the analog front-end circuit and the second and third electrodes, and configured to switch a coupling state between the second electrodes and the analog front-end circuit and a coupling state between the third electrodes and the analog front-end circuit;
• and
• a controller,
• wherein the substrate, the pixel electrodes, the display functional layer, and the common electrode are stacked in the order as listed,
• wherein the first electrodes are opposed to the second electrodes with a space therebetween, and an insulating layer is provided between the common electrode and the first and second electrodes,
• wherein the controller is configured to
• perform processing during a plurality of display periods to display an image and during a sensing period in a time-division manner, and
• control the pixel electrodes, the common electrode, the lines, the first electrodes, the second electrodes, and the third electrodes according to the display and sensing periods,
• wherein, during the display periods, in response to a control signal from the controller, the pixel electrodes are supplied with a pixel signal through the lines, and the common electrode is supplied with a common signal,
• wherein, during the sensing period, in response to the control signal from the controller, the lines are supplied with a first drive signal to generate a magnetic field, and an electromotive force caused by the magnetic field is generated in the third electrodes,
• wherein, the first electrodes are supplied with a second drive signal to generate electrostatic capacitance between themselves and the second electrodes in response to the control signal from the controller, synchronously or asynchronously with the display periods, and
• wherein the switching circuit is configured to
• couple the third electrodes to the analog front-end circuit during the sensing period, and
• couple the second electrodes to the analog front-end circuit during a period different from the sensing period.