Touch display

A touch display, comprising a flat panel display (FPD), a display driving circuit, a touch system circuit, and a display/touch signal gating-switch and output circuit or a display/touch signal loading and merge circuit enabling electrodes of the display screen to be used for display driving as well as touch detection;

• wherein the touch system circuit has a touch excitation source and a touch signal detection unit;
• the display/touch signal gating-switch and output circuit enables the electrodes of the display screen to be communicated with the display driving circuit so as to transmit display driving signals or to be communicated with the touch system circuit so as to transmit touch signals, and the display driving and the touch detection time-division multiplex the electrodes of the display screen;
• the display/touch signal loading and merge circuit enables the electrodes of the display screen to transmit display driving signals and touch signals at the same time, and the display driving and the touch detection simultaneously share the electrodes of the display screen;
• row electrode groups and column electrode groups are disposed on a substrate of the display screen, and the touch system circuit applies a touch signal to a certain electrode line in the row electrode group or the column electrode group and detects change of the touch signal on the electrode line, so as to detect whether the electrode is touched, wherein:
• the touch system circuit samples the touch signal on a certain electrode line in a period of one display frame or a multiple of one display frame, and performs data sampling on the touch signal according to a fixed synchronous relation with the touch signal applied to the electrode line, and the fixed synchronous relation refers to that every moment of obtaining the sampling data locates at the same specific phase point of the signal wave of the touch excitation source.