Display system, control device, and control method

A control device provided in a display system, the display system comprising:

• a display device comprising a plurality of gate lines, a plurality of source lines, a plurality of pixel electrodes provided respectively in regions defined by the plurality of gate lines and the plurality of source lines, and a plurality of common electrodes provided to face the plurality of pixel electrodes and used for both image display and touch detection;
• a drive circuit that supplies a reference voltage for image display during a display period, for which the display device displays an image, and supplies a touch drive signal during a touch detection period, to each of the plurality of common electrodes;
• and a touch detection circuit that performs detection of a touch by an object on the display device, based on a touch detection signal received from each of the plurality of common electrodes during the touch detection period, the control device comprising
• a CPU that selects, as an operation mode of the display system, a first mode or a second mode, wherein
• the first mode is an operation mode in which the display period and the touch detection period are alternately arranged within each of a plurality of successive frame periods of the display device, and
• the second mode is an operation mode in which, during at least one frame period, the display device displays an image while the touch detection circuit stops touch detection.

A control method used in a display system, the display system comprising:

• a display device comprising a plurality of gate lines, a plurality of source lines, a plurality of pixel electrodes provided respectively in regions defined by the plurality of gate lines and the plurality of source lines, and a plurality of common electrodes provided to face the plurality of pixel electrodes and used for both image display and touch detection;
• a drive circuit that supplies a reference voltage for image display during a display period, for which the display device displays an image, and supplies a touch drive signal during a touch detection period, to each of the plurality of common electrodes;
• and a touch detection circuit that performs detection of a touch by an object on the display device, based on a touch detection signal received from each of the plurality of common electrodes during the touch detection period, the control method comprising
• selecting, as an operation mode of the display system, a first mode or a second mode, wherein
• the first mode is an operation mode in which the display period and the touch detection period are alternately arranged within each of a plurality of successive frame periods of the display device, and
• the second mode is an operation mode in which, during at least one frame period, the display device displays an image while the touch detection circuit stops touch detection.