Touch display panel and method for driving touch display panel

A touch display panel comprising:

• a substrate;
• a plurality of scan lines on the substrate and extending in a first direction;
• a plurality of data lines on the substrate and extending in a second direction, the second direction intersecting with the first direction;
• a plurality of sub-pixels, each of the plurality of sub-pixels being defined by an area surrounded by any adjacent two of the scan lines and any adjacent two of the data lines insulatively intersecting with the adjacent two scan lines, and each of the plurality of sub-pixels comprising a pixel electrode and a first thin film transistor (TFT), a gate electrode of the first TFT is electrically connected to one of the plurality of scan lines, and a source electrode of the first TFT is electrically connected to one of the plurality of data lines, a drain electrode of the first TFT is electrically connected to the pixel electrode, and the first TFT is configured to load a display signal to the pixel electrode through one of the plurality of data lines under a control of one of the plurality of scan lines;
• a plurality of touch scan lines on the substrate and extending in the first direction;
• a plurality of touch lines on the substrate and extending in the second direction;
• a plurality of sensing units, each of the plurality of sensing units being defined by an area surrounded by any adjacent two of the touch scan lines and any adjacent two of the touch lines insulatively intersecting with the adjacent two touch scan lines, each of the plurality of sensing units comprising a common electrode and a second TFT electrically connected to the common electrode;
• and
• a driving circuit electrically connected to the plurality of scan lines, the plurality of data lines, the plurality of touch scan lines, and the plurality of touch lines;
• wherein:
• during a display period, the driving circuit applies a common voltage signal to the common electrode of each of the plurality of sensing units, and applies a display signal to the pixel electrode of each of the plurality of sub-pixels to display images;
• during a touch period, the driving circuit applies a touch driving signal to the common electrode of each of the plurality of sensing units to sense touches;
• during a fingerprint sensing period, the driving circuit applies a fingerprint sensing signal to the common electrode of each of the plurality of sensing units to sense fingerprint.

A method for driving a touch display panel, wherein the touch display panel defines a plurality of sub-pixels, each of the sub-pixels comprises one pixel electrode, and at least three adjacent sub-pixels of the plurality of sub-pixels define one pixel;

• the touch display panel further comprises a plurality of common electrodes, each of the plurality of common electrodes covers all of the pixel electrodes in the at least one pixel;
• the touch display panel comprises alternating odd and even frames, each of the odd frames comprises alternating a display period and a touch period, each of the even frames comprises a fingerprint sensing period;
• wherein:
• the driving method of the touch display panel comprises:
• applying a common voltage signal to the plurality of common electrodes during the display period, and applying a display signal to the pixel electrode of the plurality of sub-pixels to display images;
• applying a touch driving signal to the plurality of common electrodes during the touch period to sense touches;
• and
• applying a fingerprint sensing signal to the plurality of the common electrodes during the fingerprint sensing period to sense fingerprint.