CROSS REFERENCE TO RELATED APPLICATION

This is a National Phase Application filed under 35 U.S.C. 371 as a national stage of PCT/CN2019/081727, filed on Apr. 8, 2019, an application claiming the benefit of Chinese patent application No. 201810468133.X, filed on May 16, 2018, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to the field of display and touch technology, and in particular, to a touch display substrate, a touch display method, and a touch display device.

BACKGROUND

In a touch display substrate of a conventional liquid crystal display device, a common electrode layer of a liquid crystal display panel is generally divided into a plurality of common electrode blocks, each common electrode block is electrically connected with a touch control chip through a wire, and the common electrode blocks are reused as touch electrodes. In the display state, the common electrode block is used for receiving a common voltage signal; and in the touch state, the common electrode block is used for receiving a touch driving signal and outputting a touch sensing signal.

SUMMARY

In an aspect, the present disclosure provides a touch display substrate, including: a base substrate; a plurality of data lines on the base substrate and extending in a first direction; a plurality of shielding lines on a side of the plurality of data lines away from the base substrate and extending in the first direction, an orthographic projection of a respective one of the plurality of data lines on the base substrate at least partially overlapping an orthographic projection of a respective one of the plurality of shielding lines on the base substrate; a plurality of pixel electrodes arranged in an array having a plurality of rows and a plurality of columns; and a common electrode on a side of the plurality of pixel electrodes away from the base substrate. The touch display substrate further includes a plurality of first touch electrodes, the common electrode configured for at least one row of pixel electrodes of the plurality of pixel electrodes constitutes a respective one of the plurality of first touch electrodes, and the plurality of first touch electrodes are insulated from each other. The touch display substrate further includes a plurality of second touch electrodes, at least one of the plurality of shielding lines constitutes a respective one of the plurality of second touch electrodes, and the plurality of second touch electrodes are insulated from each other. The plurality of first touch electrodes and the plurality of second touch electrodes are insulated from each other.

In some embodiments, the common electrode configured for directly adjacent rows of pixel electrodes of the plurality of pixel electrodes constitutes the respective one of the plurality of first touch electrodes; and directly adjacent ones of the plurality of shielding lines are electrically connected and constitute the respective one of the plurality of second touch electrodes.

In some embodiments, the touch display substrate further includes a plurality of common electrode lines extending in a second direction different from the first direction and insulated from the plurality of data lines. The plurality of common electrode lines overlap the common electrode, and at least one insulating layer is between the plurality of common electrode lines and the common electrode. The common electrode includes a plurality of common electrode blocks arranged in an array having a plurality of rows and a plurality of columns; a respective one of the plurality of common electrode blocks is configured for a respective one of the plurality of pixel electrodes or configured for adjacent pixel electrodes in a same column of the plurality of pixel electrodes; and common electrode blocks in a same row of the plurality of common electrode blocks and a respective one of the plurality of common electrode lines are electrically connected through a via hole penetrating through the at least one insulating layer.

In some embodiments, the plurality of common electrode blocks and the plurality of shielding lines are in a same layer.

In some embodiments, an orthographic projection of the respective one of the plurality of common electrode blocks on the base substrate does not overlap the orthographic projection of the respective one of the plurality of shielding lines on the base substrate, and the respective one of the plurality of shielding lines and the respective one of the plurality of common electrode lines are in different layers, and the orthographic projection of the respective one of the plurality of shielding lines on the base substrate partially overlaps an orthographic projection of the respective one of the plurality of common electrode lines on the base substrate.

In some embodiments, the touch display substrate further includes a plurality of auxiliary conductive lines, a respective one of the plurality of auxiliary conductive lines being on and electrically connected to a surface of the respective one of the plurality of shielding lines.

In some embodiments, the touch display substrate further includes a plurality of gate lines insulated from and crossing the plurality of shielding lines. The respective one of the plurality of shielding lines includes a plurality of shielding line segments, and adjacent ones of the plurality of shielding line segments have a spacing therebetween at an overlap of an orthographic projection of a respective one of the plurality of gate lines on the base substrate and an orthographic projection of a respective one of the plurality of data lines on the base substrate.

In some embodiments, the common electrode includes a plurality of common electrode strips, each of the plurality of common electrode strips extending in a second direction and having an integral structure, and a respective one of the plurality of common electrode strips being configured for the at least one row of pixel electrodes; and the plurality of shielding lines and the common electrode are in different layers.

In some embodiments, an orthographic projection of the respective one of the plurality of common electrode strips on the base substrate at least partially overlaps an orthographic projection of the at least one row of pixel electrodes on the base substrate.

In another aspect, the present disclosure provides a touch display method, which may be applied to any one of the touch display substrates described herein. The method includes: in a display stage, outputting a common voltage level to the common electrode and the plurality of shielding lines; and in a touch stage, sequentially providing a touch driving signal to one of the plurality of first touch electrodes and the plurality of second touch electrodes, and receiving a touch sensing signal from the other of the plurality of first touch electrodes and the plurality of second touch electrodes.

In another aspect, the present disclosure provides a touch display device, including any one of the touch display substrates described herein.

In some embodiments, the touch display device further includes: a liquid crystal driving circuit configured to output a common voltage level to the common electrode and the plurality of shielding lines in a display stage; and a touch detection circuit configured to sequentially provide a touch driving signal to one of the plurality of first touch electrodes and the plurality of second touch electrodes and receive a touch sensing signal from the other of the plurality of first touch electrodes and the plurality of second touch electrodes in a touch stage.

