Capacitive touch display apparatus and touch sensing method

A touch sensing method, applied in a capacitive touch display apparatus;

• the capacitive touch display apparatus comprises a touch panel, a display panel, a touch sensing control circuit, and a time controller;
• the touch panel comprises a touch electrode layer;
• the touch electrode layer is patterned into a plurality of first electrodes disposed along a first direction and a plurality of second electrodes disposed along a second direction, the touch sensing control circuit is electrically connected with the plurality of first electrodes and the plurality of second electrodes;
• wherein in a touch sensing period, the plurality of first electrodes and the plurality of second electrodes are configured to being driving electrodes and sensing electrodes alternately;
• the touch sensing control circuit is configured to output driving signals to the driving electrodes in the touch sensing period;
• the touch sensing method comprises:
• obtaining synchronous control signals from the time controller;
• the synchronous control signals comprise a display synchronous signal and a row synchronous signal;
• in a cycle of the display synchronous signal, image scan of all rows of image in the display panel are completed;
• executing a synchronous process of the driving signals and the synchronous control signals, for causing a display image of the display panel stops refreshing in the touch sensing period;
• outputting the driving signals to the driving electrodes, calculating capacitances of each of sensing capacitors formed by the sensing electrodes, and converting the capacitances into digital signals;
• wherein the driving signals are periodically in-phase signals, the in-phase signals are pulse signals with a same frequency, a same phase, and a same amplitude;
• and
• analyzing the digital signals to obtain a touch position of a touch object on the capacitance touch display apparatus.