Input detection system and detection device that detect external resonant input support devices and touch

An input detection system comprising:

• a display device with a detection function including a plurality of pixels, a plurality of drive electrodes, and a plurality of detection electrodes arrayed in a display region;
• an input device including an inductor-capacitor (LC) circuit, a first electrode coupled to one end side of the LC circuit, and a second electrode coupled to the other end side of the LC circuit;
• and
• a drive electrode scan circuit configured to supply a drive signal to the drive electrodes, wherein
• the display device with the detection function executes a plurality of first display periods, a plurality of first detection periods, a plurality of second display periods, and a plurality of second detection periods in a time division manner,
• first drive periods correspond to the first detection periods and in which the drive electrode scan circuit supplies the drive signal to the drive electrodes,
• second drive periods correspond to the second detection periods and in which the drive electrode scan circuit supplies the drive signal to the drive electrodes,
• the first drive periods are longer than the second drive periods,
• first non-drive periods are periods between the first display periods and the first drive periods and in which the drive electrode scan circuit does not supply the drive signal to the drive electrodes,
• second non-drive periods are periods between the second display periods and the second drive periods and in which the drive electrode scan circuit does not supply the drive signal to the drive electrodes,
• the first non-drive periods are shorter than the second non-drive periods, and
• a total period of the first drive periods and the first non-drive periods is equal to a total period of the second drive periods and the second non-drive periods.