Driving method for in-cell touch display and mobile device using the same

A mobile device, comprising:

• an in-cell touch panel, comprising scan lines and touch sensors;
• and
• an display-driving and touch integrated circuit, comprising a plurality of pins which respectively coupled to the scan lines and the touch sensors,
• wherein a frame period is divided into N display/touch detection sub-periods, wherein each of display/touch detection sub-periods comprises a display sub-period and a touch detection sub-period, wherein the scan lines are divided into M scan-line sets, wherein a position of each of the scan-line sets corresponds to at least one of the touch sensors,
• wherein the display-driving and touch integrated circuit sequentially drives the scan lines in the display sub-period of the display/touch detection sub-periods of the frame period, when the scan lines being scanned by the display-driving and touch integrated circuit in the display sub-period of the Kth display/touch detection sub-period comprises the scan line of the Ith scan-line set, a display common voltage is supplied to the touch sensor corresponding to the Ith scan-line set and the other touch sensors are kept at floating voltage such that settling time of the display common voltage is reduced,
• wherein N, M, K and I are natural numbers, K is smaller than or equal to N, and I is smaller than or equal to M.