Touch panel system and electronic device

A touch panel system comprising:

• a touch panel that has electrostatic capacitances formed at each intersection of a plurality of first signal lines and a plurality of second signal lines;
• a touch pen;
• and
• a touch panel controller,
• wherein the touch panel controller, when repeatedly performing switched driving such that the plurality of first signal lines is driven through a plurality of drive signal lines from a drive unit to output charge signals based on each electrostatic capacitance from each of the second signal lines during a first signal line drive period and such that the plurality of second signal lines is driven through the plurality of drive signal lines from the drive unit to output charge signals based on each electrostatic capacitance from each of the first signal lines during a second signal line drive period, detects the position of a touch by inputting charge signals from the plurality of second signal lines or from the plurality of first signal lines into a detecting unit through a plurality of detection signal lines on the basis of a change in charges accumulated in the electrostatic capacitances due to the touch pen when the touch pen touches the touch panel,
• the touch pen is configured of an electronic pen that outputs at least two types of the states of a first pen function signal and a second pen function signal for different functions, and
• the electronic pen is provided with a control unit that produces output with a drive pattern which indicates the state of the first pen function signal each time of or once in a plurality of one of the first signal line drive period and the second signal line drive period and that produces output with a drive pattern which indicates the state of the second pen function signal each time of or once in a plurality of the other of the first signal line drive period and the second signal line drive period when outputting the state of the first pen function signal and the state of the second pen function signal.