Control method and device for touch display panel, and display device

A control device for an in-cell capacitive touch display panel for display and touch, comprising:

• a display control unit configured for, during a display period, applying gate scanning signals to the touch driving electrodes in a case where some of gate lines of the touch display panel serve as the touch driving electrodes;
• a touch control unit, for applying touch driving signals to the touch driving electrodes in sequence during a touch control period, wherein the touch sensing electrodes couple voltage signals of the touch driving signals and output the same;
• a clock unit, for dividing a time period for displaying each image frame into at least two control periods, each control period comprising the display period and the touch control period so that the time period for displaying each image frame includes at least two display periods and at least two touch control periods;
• the clock unit further for sending a trigger signal for display to the display control unit upon entering into the display period, and for sending a trigger signal for touch control to the touch control unit upon entering into the touch control period.