Sensor controller, electronic device, and control method of sensor controller that supplies intermediate potential between first potential and second potential to output signal lines

A sensor controller connected to a touch sensor including a plurality of detection electrodes arranged in a plane, the sensor controller comprising:

• a plurality of transmission drivers that, in operation, generates signal waveforms that transition between a first potential and a second potential higher than the first potential, and outputs the signal waveforms as transmission signals;
• a plurality of output signal lines that, in operation, outputs the transmission signals output from corresponding ones of the transmission drivers to corresponding ones of the detection electrodes;
• and
• an intermediate potential supply unit including a potential generation circuit that includes a voltage source or a capacitive element separate from the transmission drivers, the intermediate potential supply unit, in operation, outputting a voltage from the potential generation circuit at a first timing at which potentials of the signal waveforms start to transition from the first potential to the second potential or from the second potential to the first potential, and supplying an intermediate potential between the first potential and the second potential to the output signal lines, wherein an output side of the potential generation circuit is connected to two or more of the plurality of output signal lines;
• and
• a control circuit that, in operation, transmits a control signal,
• wherein:
• each of the transmission drivers has an output mode in which one of the transmission signals is output, and a stop mode in which a state of output is shifted to a high impedance state,
• the control circuit, in operation, controls each transmission driver of the transmission drivers to enter the stop mode at the first timing and controls the transmission driver to enter the output mode at a second timing at which a predetermined time has passed from the first timing,
• the intermediate potential supply unit includes a plurality of short-circuit control elements,
• a first end and a second end of each of the short-circuit control elements, in operation, are short-circuited together or opened according to the control signal,
• the first end of each of the short-circuit control elements is connected to a corresponding one of the output signal lines and a corresponding one of the transmission drivers, and the second end of each of the short-circuit control elements is connected to the output side of the potential generation circuit,
• the control circuit, in operation, controls the short-circuit control elements to short-circuit at the first timing and controls the short-circuit control elements to open at the second timing,
• the potential generation circuit includes the capacitive element, and
• the intermediate potential supply unit includes:
• a first short-circuit signal line connected to a first end of the capacitive element;
• a second short-circuit signal line connected to a second end of the capacitive element;
• a plurality of first short-circuit control elements, wherein a first end and a second end of each of the first short-circuit control elements, in operation, are short-circuited together or opened according to the control signal, the first end of each of the first short-circuit control elements is connected to a corresponding one of the output signal lines and the corresponding one of the transmission drivers, and the second end of each of the first short-circuit control elements is connected to the first short-circuit signal line;
• and
• a plurality of second short-circuit control elements, wherein a first end and a second end of each of the second short-circuit control elements, in operation, are short-circuited together or opened according to the control signal, the first end of each of the second short-circuit control elements is connected to a corresponding one of the output signal lines and the corresponding one of the transmission drivers, and the second end of each of the second short-circuit control elements is connected to the second short-circuit signal line.