CROSS REFERENCE TO RELATED APPLICATIONS

This application is the National Stage of PCT/CN2020/080658 filed on Mar. 23, 2020, which claims priority under 35 U.S.C. § 119 of Chinese Application No. 201910238674.8 filed on Mar. 27, 2019, the disclosure of which is incorporated by reference.

TECHNICAL FIELD

Embodiments of the present disclosure relates to a display technical field, particularly to a driving method for a touch display panel, and a touch display device.

BACKGROUND

Touch display panel (Touch Screen Panel) has gradually spread to people's lives. At present, in the process of touch display, touch signals and display signals are output in a time-dividing manner. However, with regard to the display panel with higher resolution, the amount of sub pixels in one row is more. In this way, upon the touch signals and the display signals being output in a time-dividing manner, the time for one row of sub pixels to receive the display signals is shorter, which causes some sub pixels to be under-charged.

SUMMARY

An aspect of the present disclosure provides a driving method for a touch display panel, wherein the touch display panel includes a liquid crystal layer, a common electrode, and a plurality of pixel electrodes, the common electrode includes a plurality of electrode blocks arranged at intervals and insulated from each other, the driving method includes: in a display period, providing a sinusoidal signal y to each of the plurality of electrode blocks in the common electrode; wherein the display period includes N display stages, each of the display stages includes M image frames, and a refresh rate of the display period is greater than or equal to a refresh rate threshold A, N≥2, M≤1, N is a positive integer, M is a positive number, and the refresh rate threshold is a maximum refresh rate recognizable by human eyes; providing data signals to the plurality of the pixel electrodes; and an electric field formed by the plurality of pixel electrodes and the common electrode driving liquid crystal molecules in the liquid crystal layer to rotate, and the touch display panel displaying.

In some of the embodiments of the present disclosure, in the display period, providing the sinusoidal signal y to each of the plurality of electrode blocks in the common electrode includes: continuously providing the sinusoidal signal y to each of the plurality of electrode blocks in the common electrode during the entire display period.

In some of the embodiments of the present disclosure, the sinusoidal signal y is a single-frequency sinusoidal signal.

In some of the embodiments of the present disclosure, each of the plurality of electrode blocks serves as a touch electrode to form a self-capacitance with a ground terminal.

In some of the embodiments of the present disclosure, in the display period, an average luminance value of any sub pixel in the touch display panel is approximately the same as a target luminance value of the sub pixel.

In some of the embodiments of the present disclosure, in the display period, before providing the single-frequency sinusoidal signal y to each of the plurality of electrode blocks in the common electrode, the driving method includes: acquiring a central voltage Vh, and upon the central voltage Vh being taken as a voltage of the electrode block in one sub pixel, a luminance value of the sub pixel is taken as the target luminance value of the sub pixel; wherein the center voltage Vh is a voltage of a symmetrical center of the single-frequency sinusoidal signal.

In some of the embodiments of the present disclosure, in the display period, before providing the single-frequency sinusoidal signal y to each of the plurality of electrode blocks in the common electrode, the driving method further includes: acquiring a refresh rate B of one image frame of the touch display panel; and determining the amount N of the display stages in the display period and the amount M of the image frames in each of the display stages according to the refresh rate B and the refresh rate of the display period.

In some of the embodiments of the present disclosure, in the display period, before providing the single-frequency sinusoidal signal y to each of the plurality of electrode blocks in the common electrode, the driving method further includes: acquiring a refresh time t of one image frame according to the refresh rate B of the image frame; acquiring a voltage difference ΔV1 between a pixel voltage Vp and a common voltage Vcom in each of the display stages according to the refresh time t of the image frame, the sinusoidal function y=A sin (ωt+φ), and the central voltage Vh; wherein, in one display stage, upon the pixel voltage Vp being positive, the voltage difference is: ΔV1=|Vp−Vh|−A sin(ω(t0+t×j)+φ); in a display stage, upon the pixel voltage Vp being negative, the voltage difference is: ΔV1=|Vp−Vh|+A sin(ω(t0+t×j)+φ); t0 is a starting time of the single-frequency sinusoidal signal, and t0≥0; t×j is a time of one display stage in the display period, and 0≤j≤C; acquiring an average luminance value L1 of any sub pixel in the touch display panel in the display period according to the voltage difference ΔV1 in each of the display stages in the display period; acquiring a voltage difference ΔV2 between the pixel voltage Vp and the center voltage Vh in the display period, and acquiring a target value luminance L2 of any sub pixel in the touch display panel in the display period according to the voltage difference ΔV2; calculating a frequency set of the single-frequency sinusoidal signal according to L1=L2; and selecting at least one value from the frequency set as a frequency of the single-frequency sinusoidal signal.

In some of the embodiments of the present disclosure, acquiring the luminance average L1 in the display period of any sub pixel in the touch display panel according to the voltage difference ΔV1 in each of the display stages includes: in each of the display stages, acquiring a luminance value of any sub pixel in the touch display panel in the display stage according to the voltage difference ΔV1; and carrying out weighted average on multiple luminance values of the display stages in the display period to acquire the average luminance L1 in the display period.

In some of the embodiments of the present disclosure, in each of the display stages, acquiring the luminance value of any sub pixel in the touch display panel in the display stage according to the voltage difference ΔV1 includes: in each of the display stages, acquire a function L=H(V) of the voltage difference ΔV1 and the luminance value of the sub pixel by using an electro-optical characteristic curve of the touch display panel; and calculating the luminance value of any sub pixel in the touch display panel in the display stage according to the function L=H(V).

In some of the embodiments of the present disclosure, selecting at least one value from the frequency set as the frequency of the single-frequency sinusoidal signal includes: acquiring a scanning period Ta of each row of sub pixels according to a resolution of the touch display panel; the frequency of the single-frequency sinusoidal signal is f=kTa/2, k>0, k is an integer.

In some of the embodiments of the present disclosure, the scanning period Ta satisfies a formula: Ta=1/(B×S), in which S is an amount of gate lines for receiving gate scanning signals in an active area of the touch display panel.

In some of the embodiments of the present disclosure, before acquiring the voltage difference ΔV1 between the pixel voltage Vp and the common voltage Vcom in each of the display stages, the driving method further includes: setting an initial phase φ in the sinusoidal function y=A sin(ωt+φ) to zero.

In some of the embodiments of the present disclosure, before acquiring the voltage difference ΔV1 between the pixel voltage Vp and the common voltage Vcom in each of the display stages, the driving method further includes: setting a voltage on the charged pixel electrode at a timing that a transistor connected with the pixel electrode is turned off as the pixel voltage Vp.

Another aspect of the present disclosure provides a touch display device, including a touch display panel, a memory and a processor, wherein the memory stores a computer program capable of being executed by the processor, and the processor implements any driving method described above upon executing the computer program.

In some of the embodiments of the present disclosure, the touch display panel includes a liquid crystal layer, a common electrode, and a plurality of pixel electrodes; the common electrode includes a plurality of electrode blocks which are arranged at intervals and insulated from each other; the touch display device further includes a driving circuit connected with the processor; the driving circuit includes a sinusoidal signal driving sub-circuit and a source driving sub-circuit; the sinusoidal signal driving sub-circuit is electrically connected with the plurality of electrode blocks in the common electrode, and is configured for providing the sinusoidal signal y to each of the plurality of electrode blocks in the common electrode; the source driving sub-circuit is electrically connected with the pixel electrodes in respective sub pixels in the touch display panel, and is configured for providing data signals to the plurality of pixel electrodes.

In some of the embodiments of the present disclosure, the driving circuit further includes a gate driving sub-circuit; the gate driving sub-circuit is connected with a plurality of gate lines of the touch display panel, and is configured for providing gate scanning signals to the plurality of gate lines.

Another aspect of the present disclosure provides a computer readable medium, storing a computer program, wherein the computer program implements any method described above upon being executed by a processor.

