CN114546172A - Touch display panel, driving method thereof and touch display device - Google Patents
Touch display panel, driving method thereof and touch display device Download PDFInfo
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- CN114546172A CN114546172A CN202210186730.XA CN202210186730A CN114546172A CN 114546172 A CN114546172 A CN 114546172A CN 202210186730 A CN202210186730 A CN 202210186730A CN 114546172 A CN114546172 A CN 114546172A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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Abstract
The invention discloses a touch display panel, a driving method thereof and a touch display device, wherein the touch display panel comprises a driving circuit, and the driving circuit comprises a time sequence control circuit, a display driving circuit and a touch driving circuit; the time sequence control circuit is used for providing a frame synchronization signal in each image frame, and the frame synchronization signal comprises a plurality of display stages, a plurality of touch stages and a display pre-charging stage; the display driving circuit is used for outputting a display signal in a display stage and outputting a virtual display signal in a display pre-charging stage; the touch driving circuit is used for outputting a touch signal in a touch stage and a display pre-charging stage. By adopting the technical scheme, the touch control driving circuit not only outputs the touch control signal in the touch control stage, but also outputs the touch control signal in the display pre-charging stage, namely, the time of the touch control stage and the display stage is adjusted, the time ratio of the touch control stage to one frame of image frame is reduced, the time ratio of the display stage to one frame of image frame is improved, and the display effect of the touch control display panel is ensured.
Description
Technical Field
The invention relates to the technical field of display, in particular to a touch display panel, a driving method thereof and a touch display device.
Background
Nowadays, touch display panels are widely used by people, for example, smart phones, tablet computers and the like all use touch display panels. The conventional touch display panel generally adopts a display and touch time-sharing driving mode to output a display driving signal and a touch driving signal within each frame of image frame.
With the development of touch display technology, the demand of products at present is to develop to a higher refresh rate and a higher touch report rate. For a specific refresh frequency, the refresh time of one frame of image frame is fixed, the time allocated to the display drive is also fixed, and the higher the refresh frequency, the smaller the time allocated to the display drive in each frame of image frame, the less the display signal writing effect is affected, and the display effect is affected.
Disclosure of Invention
The embodiment of the invention provides a touch display panel, a driving method thereof and a touch display device, which can improve the display driving time, improve the display signal writing effect and ensure the display effect of the touch display panel.
In a first aspect, an embodiment of the present invention provides a touch display panel, where the touch display panel includes a driving circuit, where the driving circuit includes a timing control circuit, a display driving circuit, and a touch driving circuit;
the time sequence control circuit is used for providing a frame synchronization signal for each image frame, and the frame synchronization signal comprises a plurality of display stages, a plurality of touch stages and a display pre-charging stage;
the display driving circuit is used for outputting a display signal in the display stage and outputting a virtual display signal in the display pre-charging stage;
the touch driving circuit is used for outputting a touch signal in the touch stage and the display pre-charging stage.
In a second aspect, an embodiment of the present invention provides a driving method of a touch display panel, for driving the touch display panel described in any one of the first aspects, where the touch display panel includes a plurality of image frames, each of the image frames includes a plurality of display phases, a plurality of touch phases, and a display precharge phase;
the driving method includes:
in the display stage, performing display driving operation on the touch display panel;
in the touch control stage, performing first touch control driving operation on the touch control display panel;
in the display pre-charging stage, pre-charging operation is carried out on the touch display panel, and meanwhile, second touch driving operation is carried out on the touch display panel
In a third aspect, an embodiment of the present invention provides a touch display device, including the touch display panel of any one of the first aspects.
In the embodiment of the invention, the touch display panel comprises a driving circuit, the driving circuit comprises a time sequence control circuit, a display driving circuit and a touch driving circuit, the display driving circuit is used for outputting a display signal in a display stage and outputting a virtual display signal in a display pre-charging stage, the touch driving circuit is used for outputting the touch signal in the touch stage and the display pre-charging stage, namely, the display pre-charging stage and the touch stage are overlapped on a time sequence, the time occupied by the touch stage in the whole image frame is reduced, the time occupation ratio of the display stage in the whole image frame is correspondingly improved, the display driving time is improved, the writing effect of the display signal is improved, and the display effect of the touch display panel is ensured.
Drawings
FIG. 1 is a schematic diagram of a frame synchronization signal of a touch display panel in the prior art;
fig. 2 is a schematic structural diagram of a touch display panel according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a frame synchronization signal of the touch display panel shown in FIG. 2;
FIG. 4 is a schematic diagram of another frame synchronization signal of the touch display panel shown in FIG. 2;
FIG. 5 is a schematic diagram of another frame synchronization signal of the touch display panel shown in FIG. 2;
FIG. 6 is a schematic diagram of another frame synchronization signal of the touch display panel shown in FIG. 2;
FIG. 7 is a schematic diagram of another frame synchronization signal of the touch display panel shown in FIG. 2;
FIG. 8 is a schematic diagram of another frame synchronization signal of the touch display panel shown in FIG. 2;
FIG. 9 is a schematic diagram of another frame synchronization signal of the touch display panel shown in FIG. 2;
FIG. 10 is a schematic diagram of another frame synchronization signal of the touch display panel shown in FIG. 2;
FIG. 11 is a schematic diagram of another frame synchronization signal of the touch display panel shown in FIG. 2;
FIG. 12 is a schematic diagram of another frame synchronization signal of the touch display panel shown in FIG. 2;
FIG. 13 is a schematic diagram of another frame synchronization signal of the touch display panel shown in FIG. 2;
fig. 14 is a flowchart illustrating a driving method of a touch display panel according to an embodiment of the invention;
fig. 15 is a schematic structural diagram of a touch display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic diagram of a frame synchronization signal of a touch display panel in the prior art, and as shown in fig. 1, the touch display panel in the prior art includes a driving circuit, which outputs a display signal, a dummy display signal and a touch signal for the touch display panel. As shown in fig. 1, the display pre-charge stage V is located at the beginning and end of each frame sync signal in time sequence, the driving circuit outputs a dummy display signal in the display pre-charge stage V, the driving circuit outputs a display signal in the display stage D ', and the driving circuit outputs a touch signal in the touch stage T'. Specifically, in each frame of the synchronization signal, the scanning of all pixels and touch electrodes of the touch display panel is completed by outputting the display signal, the virtual display signal and the touch signal, so that the touch function and the display function of the touch display panel are ensured.
In order to achieve a higher refresh rate and a higher touch hit rate of the touch display panel, the time of the display signal and the touch signal output by the driving circuit in each frame of the fixed synchronization signal needs to be allocated as required. With the increasing of the refresh frequency, the time allocated to the display drive in each frame of image frame is less and less, which affects the writing effect of the display signal and the display effect.
In view of the foregoing problems, an embodiment of the present invention provides a touch display panel, where the touch display panel includes a driving circuit, and the driving circuit includes a timing control circuit, a display driving circuit, and a touch driving circuit; the display driving circuit is used for outputting a display signal in a display stage and outputting a virtual display signal in a display pre-charging stage; the touch driving circuit is used for outputting the touch signals in the touch stage and the display pre-charging stage, namely, the display pre-charging stage and the touch stage are overlapped in time sequence, so that the occupied time of the touch stage in the whole image frame is reduced, the saved time can be provided for the display stage to be used for outputting the display signals, namely, the occupied time of the display stage in the whole image frame is correspondingly improved, the writing effect of the display signals is improved, and the display effect of the touch display panel is ensured.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
Fig. 2 is a schematic structural diagram of a touch display panel according to an embodiment of the present invention, fig. 3 is a schematic diagram of a frame synchronization signal of the touch display panel provided in fig. 2, and with reference to fig. 2 and fig. 3, the touch display panel 10 includes a driving circuit 200, the driving circuit 200 includes a timing control circuit 210, a display driving circuit 220 and a touch driving circuit 230; the timing control circuit 210 is configured to provide a frame synchronization signal in each image frame Tt, where the frame synchronization signal includes a plurality of display phases D, a plurality of touch phases T, and a display precharge phase V; the display driving circuit 220 is used for outputting a display signal in the display stage D and outputting a dummy display signal in the display precharge stage V; the touch driving circuit 230 is configured to output a touch signal in a touch stage T and a display precharge stage V.
Illustratively, the driving circuit 200 includes a timing control circuit 210, a display driving circuit 220 and a touch driving circuit 230, wherein the display driving circuit 220 is used for providing a display signal required by the touch display panel 10 to complete the display function of the touch display panel 10; the touch driving circuit 230 is used for providing a touch signal required by the touch display panel 10 to complete the touch function of the touch display panel 10. The timing control circuit 210 is used for providing a working timing of the driving circuit 200, that is, controlling the driving circuit 200 to provide timing control of the display signal and providing timing control of the control signal, so as to ensure that the display function and the touch function are distributed according to the timing.
Further, the timing control circuit 210 is configured to provide a frame synchronization signal in each image frame Tt, each image frame Tt includes a display frame and a touch frame, and the output of the display signal and the output of the touch signal of the entire touch display panel 10 in one image frame are completed in each image frame Tt. The frame sync signal includes a plurality of display phases D (D1, D2, D3, and D4), a plurality of touch phases T (T1, T2, T3, and T4), and a display precharge phase V (VBP and VFP). For example, as shown in fig. 3, the display phase D may include four display phases D1, D2, D3, and D4, the touch phase T may include four touch phases T1, T2, T3, and T4, the display precharge phase V may include a display Back dead time (Vertical Back Porch VBP) and a display Front dead time (Vertical Front Porch VFP), the display Back dead time VBP represents a time for performing the inactive scan at the beginning of the image frame Tt after the Vertical synchronization period, and the display Front dead time VFP represents a time for performing the inactive scan at the end of the image frame Tt after the Vertical synchronization period. The specific number of the display stage and the touch stage is not limited in the embodiment of the present invention, and fig. 3 only illustrates that the display stage includes four display stages, and the touch stage includes four touch stages.
Specifically, as shown in fig. 2, the touch display panel 10 includes a display area 100 and a non-display area 110, the display driving circuit 220 is used for providing a display signal to the display sub-pixels arranged in the display area 100 in the display stage D, and the display driving circuit 220 is used for providing a dummy display signal to the dummy sub-pixels arranged in the non-display area 110 in the display pre-charge stage V. The touch driving circuit 230 outputs the touch signal to the touch electrode in the touch stage T, and the touch driving circuit 230 may also output the touch signal in the display precharge stage V, that is, there is an overlap between the display precharge stage V and the touch stage T in time sequence, so that at least one touch stage T time may be left in each image frame Tt, and the four vacant time frames may be used to compensate for the display stage D, so as to meet the requirement of the touch display panel 10 for a higher display charging rate, and ensure the display effect of the touch display panel 10.
Illustratively, as shown in fig. 3, in one image frame Tt, a plurality of display phases D1, D2, D3 and D4, a plurality of touch phases T1, T2, T3 and T4, and display precharge phases VBP and VFP are included. The timing control circuit 210 according to the embodiment of the present invention places the touch stage T4 in the display front-end idle time VFP, and the timing control circuit 210 controls the display driving circuit 220 to output the virtual display signal and the touch driving circuit 230 to output the touch signal in the display front-end idle time, that is, the display front-end idle time VFP and the touch stage T4 are overlapped in timing. Thus, the time of the original touch stage T4 can be used to compensate for any display stage D1, D2, D3 and D4, as shown in fig. 3, the spare time is used to compensate for the display stage D4, so as to increase the time for outputting the display signal in the display stage D4, that is, the time sequence position of the touch stage T in each image frame Tt is adjusted, so as to meet the requirement of the touch display panel 10 for a higher display charging rate, thereby ensuring the display effect of the touch display panel 10.
Further, since the display driving circuit 220 is configured to output only the virtual display signal instead of the real effective display signal in the display pre-charge stage, that is, the virtual display signal output by the display driving circuit 220 in the display pre-charge stage does not generate a real display image in the touch display panel 10, the display pre-charge stage and the touch stage are configured to overlap in time sequence, so that the touch signal output in the display pre-charge stage does not interfere with the display signal, that is, the normal display of the touch display panel is not affected, it is ensured that the touch function and the display function are independent and not affected, and the display effect and the touch effect of the touch display panel are ensured.
To sum up, in each image frame, the display precharge stage is used for outputting the virtual display signal and the touch signal, i.e., the display precharge stage and the touch stage overlap in time sequence, so that the time occupied by the touch stage in the whole image frame is reduced, the saved time can be provided for the display stage for outputting the display signal, and the time occupied by the display stage in the whole image frame is increased. The time of the display stage in the whole image frame is correspondingly increased by adjusting the time of the touch control stage and the display stage, the time of display driving is increased, the writing effect of the display signal is increased, the display effect of the touch control display panel is ensured, meanwhile, the touch control signal is ensured not to interfere the display signal, and the normal display effect of the touch control display panel is not influenced.
The following describes in detail various cases of the timing adjustment of the touch stage in each image frame.
Fig. 4 is a schematic diagram of another frame synchronization signal of the touch display panel provided in fig. 2, fig. 5 is a schematic diagram of another frame synchronization signal of the touch display panel provided in fig. 2, and in combination with fig. 2 to 5, the touch display panel 10 further includes a plurality of touch electrodes 300; the touch driving circuit 230 is configured to output a touch signal to perform touch scanning on the first portion of the touch electrodes 300 in the touch stage T, and output a touch signal to perform touch scanning on the second portion of the touch electrodes 300 in the display precharge stage V.
For example, as shown in fig. 2, the touch display panel 10 further includes a plurality of touch electrodes 300, and different touch electrodes 300 may receive the touch signal provided by the touch driving circuit 230 in a time-sharing manner to perform touch scanning, so that the scanning of all touch electrodes 300 is completed in each image frame Tt. The touch driving circuit 230 outputs the touch signal at the touch stage T to complete the touch scanning of a portion of the touch electrodes 300, the touch driving circuit 230 also outputs the touch signal at the display precharge stage V to complete the touch scanning of another portion of the touch electrodes 300, i.e., the display precharge stage and the touch stage overlap in time sequence, thereby reducing the time occupied by the frame synchronization signal in the whole image frame at the touch stage, saving the time for providing the display stage for outputting the display signal, and increasing the time occupied by the frame synchronization signal in the whole image frame at the display stage.
Specifically, the touch stage T adjacent to the display precharge stage V in time sequence may be set in the display precharge stage V, so as to leave extra time for outputting the display signal, thereby ensuring the display effect of the touch display panel 10.
For example, as shown in fig. 3, in the image frame Tt, the touch driving circuit 230 is configured to perform touch scanning on the first portion of touch electrodes 300 during the touch phases T1, T2, and T3. The touch driving circuit 230 is originally configured to perform touch scanning on the second portion of the touch electrodes 300 during the touch stage T4, the original timing position of the touch stage T4 is adjacent to the display front end idle time VFP timing, and the touch stage T4 is located in the display front end idle time VFP, so that the touch driving circuit 230 is configured to perform touch scanning on the second portion of the touch electrodes 300 (i.e., the touch electrodes whose touch scanning is completed during the touch stage T4) during the display front end idle time VFP. The remaining free time at the original touch stage T4 is used to compensate for the display stage D4, and may also be used to compensate for other display stages D (not shown in the figure), which is not specifically limited in the embodiment of the present invention. That is, it is ensured that the touch signals output by the touch driving circuit 230 complete the touch scanning on all the touch electrodes 300, and it is also ensured that the time of the display stage D is increased, the requirement of the touch display panel 10 for higher display charging rate is ensured, and the display effect of the touch display panel 10 is ensured; meanwhile, the touch signal is ensured not to interfere the display signal, and the normal display effect of the touch display panel is not influenced.
For example, as shown in fig. 4, in the image frame Tt, the original timing position of the touch phase T1 is adjacent to and close to the display back end idle time VBP, and the touch phase T1 is located in the display back end idle time VBP, so that the touch driving circuit 230 is configured to perform touch scanning on the second portion of the touch electrodes 300 (i.e., the touch electrodes completing the touch scanning in the touch phase T1) during the display back end idle time VBP. The free time left in the original touch stage T1 is used for compensating the display stage D1, and can also be used for compensating other display stages D (not shown in the figure). That is, it is ensured that the touch signals output by the touch driving circuit 230 complete the touch scanning on all the touch electrodes 300, and it is also ensured that the time of the display stage D is increased, the requirement of the touch display panel 10 for higher display charging rate is ensured, and the display effect of the touch display panel 10 is ensured; meanwhile, the touch signal is ensured not to interfere the display signal, and the normal display effect of the touch display panel is not influenced.
Further, as shown in fig. 5, the original timing position of the touch stage T1 is closer to the display back end idle time VBP timing, the original timing position of the touch stage T4 is closer to the display front end idle time VFP timing, the touch stage T1 is set in the display back end idle time VBP, and the touch stage T5 is set in the display front end idle time VFP, so that the touch driving circuit 230 is configured to perform touch scanning on the second portion of the touch electrodes 300 (i.e., the touch electrodes of the touch stage T1 and the touch stage T4 that complete touch scanning) during the display precharge stage VBP and the VFP. A free time is left at the original touch stage T1, a free time is left at the original touch stage T4, and the free times are respectively used for compensating the display stages D1 and D4, and can also be used for compensating other display stages D (not shown in the figure). That is, it is ensured that the touch signals output by the touch driving circuit 230 complete the touch scanning on all the touch electrodes 300, and it is also ensured that the time of the display stage D is increased, the requirement of the touch display panel 10 for higher display charging rate is ensured, and the display effect of the touch display panel 10 is ensured; meanwhile, the touch signal is ensured not to interfere the display signal, and the normal display effect of the touch display panel is not influenced.
Fig. 6 is a schematic diagram of another frame synchronization signal of the touch display panel provided in fig. 2, and fig. 7 is a schematic diagram of another frame synchronization signal of the touch display panel provided in fig. 2, and in conjunction with fig. 2, 6 and 7, the touch display panel 10 includes a plurality of touch electrodes 300; the touch driving circuit 230 is configured to output a touch signal to perform touch scanning on the touch electrode 300 in the touch stage T, and output a touch signal to perform noise detection on the touch display panel 10 in the display precharge stage V.
Specifically, there may be a touch noise detection stage Tn in each image frame Tt, completing scanning of all touch electrodes 300 within each image frame Tt, and performing noise detection on the touch display panel 10. That is, the touch driving circuit 230 outputs the touch signal in the touch stage T to complete the touch scanning of the touch electrode 300, and the touch driving circuit 230 may also output the touch signal in the display precharge stage V to complete the noise detection of the touch display panel 10. Namely, the original time sequence position of the touch noise detection stage Tn is set in the display pre-charging stage V, so that extra time is left for outputting a display signal, and the display effect of the touch display panel 10 is ensured; meanwhile, the touch signal is ensured not to interfere the display signal, and the normal display effect of the touch display panel is not influenced.
Illustratively, the touch driving circuit 230 outputs the touch signal for noise detection in the touch noise detection stage Tn, as shown in fig. 6, in the image frame Tt, the original timing position of the touch noise detection stage Tn is close to the display front end idle time VFP timing, and the touch noise detection stage Tn is placed in the display front end idle time VFP, so that the touch driving circuit 230 is used for noise detection of the touch display panel 10 in the display front end idle time VFP. A free time left in the original touch noise detection stage Tn is used for compensating the display stage D4, and can also be used for compensating other display stages D (not shown in the figure). The noise detection of the touch signal output by the touch driving circuit 230 is ensured, the time of the display stage D is also ensured to be increased, the requirement of the touch display panel 10 on a high display charging rate is ensured, and the display effect of the touch display panel 10 is ensured.
For example, as shown in fig. 7, in the image frame Tt, the original timing position of the touch noise detection stage Tn is adjacent to the timing position of the display back end blank time VBP, and the touch noise detection stage Tn is located in the display back end blank time VBP, so that the touch driving circuit 230 is configured to perform noise detection on the touch display panel 10 at the display back end blank time VBP. A free time left in the original touch noise detection stage Tn is used for compensating the display stage D1, and can also be used for compensating other display stages D (not shown in the figure). The noise detection of the touch signal output by the touch driving circuit 230 is ensured, the time of the display stage D is also ensured to be increased, the requirement of a high display charging rate of the touch display panel 10 is improved, and the display effect of the touch display panel 10 is ensured.
Fig. 8 is a schematic diagram of another frame synchronization signal of the touch display panel provided in fig. 2, and fig. 9 is a schematic diagram of another frame synchronization signal of the touch display panel provided in fig. 2, and in conjunction with fig. 2, fig. 8 and fig. 9, the touch display panel 10 includes a plurality of touch electrodes 300; the touch driving circuit 230 is configured to output a touch signal to perform touch scanning on the first portion of the touch electrodes 300 in the touch stage T, and output a touch signal to perform touch scanning on the second portion of the touch electrodes 300 and perform touch noise detection on the touch display panel 10 in the display pre-charge stage V.
Specifically, each image frame Tt includes two display precharge stages V, i.e., a display back-end idle time VBP and a display front-end idle time VFP. The touch noise detection stage Tn and a part of the touch stage T are set in the display pre-charging stage V, and extra time is left for outputting the display signal, so that the display effect of the touch display panel 10 is ensured.
For example, as shown in fig. 8, in the image frame Tt, the original timing position of the touch noise detection phase Tn is adjacent to the display rear end vacant time VBP timing, and the original timing position of the touch phase T4 is adjacent to the display front end vacant time VFP timing. The touch noise detection stage Tn is set in the display back end idle time VBP, and the touch stage T4 is set in the display front end idle time VFP, so that the touch driving circuit 230 is used for performing noise detection on the touch display panel 10 at the display back end idle time VBP, and the touch driving circuit 230 outputs the touch signal at the display front end idle time VFP to perform touch scanning on a part of the touch electrodes. A free time is left in the original touch noise detection stage Tn, and a free time is left in the original touch stage T4, and the free times are respectively used for compensating the display stage D1 and the display stage D4, and can also be used for compensating the other display stages D (not shown in the figure). The noise detection and the touch scanning of the touch electrode 300 are performed by the touch signal output by the touch driving circuit 230, the time of the display stage D is increased, the requirement of a high display charging rate of the touch display panel 10 is met, and the display effect of the touch display panel 10 is ensured.
For example, as shown in fig. 9, in the image frame Tt, the original timing position of the touch noise detection stage Tn is adjacent to the display front end vacant time VFP timing and the original timing position of the touch stage T1 is adjacent to the display rear end vacant time VBP timing, the touch noise detection stage Tn is placed in the display front end vacant time VFP, and the touch stage T1 is placed in the display rear end vacant time VBP, so that the touch driving circuit 230 is configured to perform noise detection on the touch display panel 10 at the display front end vacant time VFP, and the touch driving circuit 230 outputs a touch signal at the display rear end vacant time VBP to perform touch scanning on a part of the touch electrodes. A free time is left at the original touch noise detection stage Tn, and a free time is left at the original touch stage T1, and the free times are respectively used for compensating the display stage D1 and the display stage D4. The noise detection and the touch scanning of the touch electrode 300 are performed by the touch signal output by the touch driving circuit 230, the time of the display stage D is increased, the requirement of a high display charging rate of the touch display panel 10 is met, and the display effect of the touch display panel 10 is ensured.
In summary, by setting a part of the touch control phase and the display pre-charge phase to overlap in time sequence, a part of the touch control scanning phase and/or the touch control noise detection phase and the display pre-charge phase can be specifically set to overlap in time sequence, so as to reduce the time ratio of the touch control phase in the whole image frame, improve the time ratio of the display phase in the whole image frame, ensure the requirement of the touch control display panel on high display charge rate, improve the write-in time and the write-in effect of the display signal, and improve the display effect of the touch control display panel; meanwhile, the touch signal is ensured not to interfere the display signal, and the normal display effect of the touch display panel is not influenced.
On the basis of the above embodiment, with reference to fig. 2 to 9, in the same image frame Tt, the display precharge phase V includes the first sub-display precharge phase VBP and the second sub-display precharge phase VFP; in terms of timing, the first sub-display pre-charge stage VBP is located before any display stage D, and the second sub-display pre-charge stage VFP is located after any display stage D; the display driving circuit 220 is used for outputting a dummy display signal in the first sub-display precharge phase VBP and the second sub-display precharge phase VFP; the touch driving circuit 230 is configured to output a touch signal during the first sub-display pre-charge phase VBP and/or the second sub-display pre-charge phase VFP.
Specifically, the display precharge phase V includes a first sub-display precharge phase VBP and a second sub-display precharge phase VFP, i.e., the first sub-display precharge phase VBP is equivalent to the display back-end idle time VBP, and the second sub-display precharge phase VFP is equivalent to the display front-end idle time VFP. Referring to fig. 3 to 9, the first sub-display precharge phase VBP is located at the beginning of each image frame Tt, and the second sub-display precharge phase VFP is located at the ending of each image frame Tt, that is, the first sub-display precharge phase VBP is located before the second sub-display precharge phase VFP at the same time of the image frame Tt, and further, the second sub-display precharge phase VFP is located before the first sub-display precharge phase VBP at the next image frame Tt at the same time. The display driving circuit 220 and the touch driving circuit 230 respectively output a display signal and a touch signal in the first sub-display pre-charge stage VBP and the second sub-display pre-charge stage VFP, the display driving circuit 220 outputs a virtual display signal in the first sub-display pre-charge stage VBP and the second sub-display pre-charge stage VFP, and the touch driving circuit 230 outputs a touch signal in the first sub-display pre-charge stage VBP and/or the second sub-display pre-charge stage VFP, so as to reduce the time ratio of the touch stage in the whole image frame, increase the time ratio of the display stage in the whole image frame, ensure the requirement of the touch display panel 10 for a higher display charge rate, and ensure the display effect of the touch display panel 10.
Illustratively, the touch driving circuit 230 is configured to output the touch signal during the first sub-display pre-charge phase VBP or the second sub-display pre-charge phase VFP. As shown in fig. 3, the original timing position of the touch stage T4 is adjacent to the second sub-display pre-charge stage VFP, the touch stage T4 is placed in the second sub-display pre-charge stage VFP, a free time is reserved in the image frame Tt, and the free time is added to the display stage D4 for outputting a display signal, so as to improve the display effect of the touch display panel 10. As shown in fig. 4, the original timing position of the touch stage T1 is adjacent to the first sub-display pre-charge stage VBP, the touch stage T1 is placed in the first sub-display pre-charge stage VBP, a free time is reserved in the image frame Tt, and the free time is added to the display stage D1 for outputting a display signal, so as to improve the display effect of the touch display panel 10.
Further, the touch driving circuit 230 is configured to output a touch signal during the first sub-display pre-charge phase VBP and the second sub-display pre-charge phase VFP. As shown in fig. 5, the original timing position of the touch stage T5 is adjacent to the second sub-display pre-charge stage VFP, the original timing position of the touch stage T1 is adjacent to the first sub-display pre-charge stage VBP, meanwhile, the touch stage T5 is disposed in the second sub-display pre-charge stage VFP, the touch stage T1 is disposed in the first sub-display pre-charge stage VBP, a free time is reserved in the image frame Tt, and the two free times are respectively added to the display stage D1 and the display stage D4, which are both used for outputting a display signal to improve the display effect of the touch display panel 10.
Based on the above embodiment, with reference to fig. 2, 6 and 9, the multiple touch phases T include a touch noise detection phase Tn and multiple touch scanning phases T; the plurality of touch scanning stages T in the same image frame Tt include a first touch scanning stage T1, where in terms of timing, the first touch scanning stage T1 is located before any other touch scanning stage T, and the touch noise detection stage Tn is located after any touch scanning stage T; the first touch scan phase T1 overlaps the first sub-display precharge phase VBP in timing, and/or the touch noise detection phase Tn overlaps the second sub-display precharge phase VFP in timing.
Specifically, the touch driving circuit 230 performs touch noise detection on the touch display panel 10 at a touch noise detection stage Tn, and the touch driving circuit 230 performs touch scanning on all the touch electrodes 300 at different times at a plurality of touch scanning stages T. The touch scanning stage T includes a first touch scanning stage T1, and the first touch scanning stage T1 is located before other touch scanning stages T (touch stages T2, T3, T4, etc.) in the timing of each image frame Tt. For example, as shown in fig. 6, the touch noise detection stage Tn and the second sub-display pre-charge stage VFP are overlapped in timing sequence, so as to further provide more spare time for outputting the display signal, thereby ensuring the display effect of the touch display panel 10. As shown in fig. 9, the first touch scan stage T1 and the first sub-display pre-charge stage VBP are overlapped in time sequence, and the touch noise detection stage Tn and the second sub-display pre-charge stage VFP are overlapped in time sequence, so as to further provide more spare time for outputting the display signal, thereby ensuring the display effect of the touch display panel 10.
Based on the above embodiment, with reference to fig. 2, 7 and 8, the multiple touch phases T include a touch noise detection phase Tn and multiple touch scanning phases T; the plurality of touch scan stages T in the same image frame Tt include a second touch scan stage T4, where in terms of timing, the second touch scan stage T4 is located after any other touch scan stage T, and the touch noise detection stage Tn is located before any touch scan stage T; the touch noise detection phase Tn overlaps the first sub-display precharge phase VBP in timing, and/or the second touch scan phase T4 overlaps the second sub-display precharge phase VFP in timing.
Specifically, the touch scanning phase T includes a second touch scanning phase T4, and the second touch scanning phase T4 is located after the other touch scanning phases T at the timing of each image frame Tt, i.e., the original timing position of the second touch scanning phase T4 is adjacent to the timing position of the second sub-display precharge phase VFP. For example, as shown in fig. 7, the touch noise detection phase Tn and the first sub-display precharge phase VBP are overlapped in timing sequence, and a free time is reserved in the image frame Tt, and the free time is used to increase the time of the display phase D1, so as to ensure that the display driving circuit 220 outputs the display signal and ensure the display effect of the touch display panel 10. As shown in fig. 8, the second touch scanning phase T4 and the second sub-display pre-charge phase VFP are overlapped in time sequence, and the touch noise detection phase Tn and the first sub-display pre-charge phase VBP are overlapped in time sequence, so as to further provide more spare time for outputting the display signal, thereby ensuring the display effect of the touch display panel 10.
Fig. 10 is a schematic diagram of another frame synchronization signal of the touch display panel provided in fig. 2, and in conjunction with fig. 2 and 10, the plurality of touch phases T includes a first touch phase Tc, and the first touch phase Tc overlaps with the display precharge phase V in time sequence; the pulse number of the touch signal output by the touch driving circuit 230 in the first touch phase Tc is less than or equal to the pulse number of the touch signal output in any other touch phase T.
Specifically, as shown in fig. 10, the first touch stage Tc and the display pre-charging stage V are overlapped in time sequence, and a free time is left in the time sequence of the first touch stage Tc in the image frame Tt, and the free time is used for increasing the time of the display stage D, so as to ensure the output time of the display signal and ensure the display effect of the touch display panel 10. For example, the original timing position of the first touch stage Tc may be adjacent to the timing position of the second sub-display pre-charge stage VFP (not shown in the drawings), and the embodiment of the invention does not limit the timing overlapping between the first touch stage Tc and the first sub-display pre-charge stage VBP or between the first touch stage Tc and the second sub-display pre-charge stage VFP.
The touch driving circuit 230 outputs the touch signal in the form of a pulse signal in the touch phase T, and it can be understood that the more the number of pulses included in the pulse signal, the more time required for outputting the touch signal, the less the number of pulses included in the pulse signal, and the less time required for outputting the touch signal. In order to satisfy the overlapping of the first touch phase T1 and the display precharge phase V in terms of time sequence, i.e. to satisfy the time required for outputting the touch signal in the display precharge phase V (VBP or VFP), the number of pulses of the touch signal output by the touch driving circuit 230 in the first touch phase T1 may be set to be less than or equal to the number of pulses of the touch signal output in any other touch phase T (T2, T3 or T4), so as to ensure that the time required for outputting the touch signal in the display precharge phase V (VBP or VFP) is satisfied, i.e. the overlapping of the first touch phase T1 and the display precharge phase V in terms of time sequence is satisfied. It should be noted that fig. 10 only illustrates that the number of pulses of the touch signal output in the first touch stage T1 is smaller than the number of pulses of the touch signal output in any other touch stage T (T2, T3, or T4).
For example, if the time required for the first touch phase T1 is 106 μ s, the time required for displaying the precharge phase V (VBP or VFP) is 100 μ s, and the time required for displaying the precharge phase V is less than the time required for the first touch phase T1, the number of pulses of the touch signal output by the touch driving circuit 230 in the first touch phase T1 is set to be less than or equal to the number of pulses of the touch signal output in any other touch phase T (T2, T3, or T4), as shown in fig. 10, so as to ensure that the time required for outputting the touch signal in the display precharge phase V (VBP or VFP) can be satisfied, that is, the first touch phase T1 and the display precharge phase V are overlapped in time sequence.
On the basis of the above embodiment, as shown in fig. 2 and 7, the plurality of display phases D includes a first display phase Dc and a second display phase Dd; the number of display sub-pixel rows receiving the display signals in the first display phase Dc is equal to or less than the number of display sub-pixel rows receiving the display signals in the second display phase Dd; the display driving circuit 220 drives the first display period Dc for a longer period than the second display period Dd.
The frame synchronization signal of each image frame Tt includes a plurality of display phases D, the display driving circuit 220 outputs the display signals in the plurality of display phases D, a part of the display sub-pixels in each display phase D receives the display signals, and the display driving circuit 220 outputs the display signals in all the display phases D in each image frame Tt, so that all the display sub-pixels in the touch display panel 10 receive the display signals. Specifically, as shown in fig. 7, the first touch stage T1 and the display precharge stage V overlap in timing, and the time left at the timing position of the first touch stage T1 is originally used for outputting the display signal. The display phase D includes a first display phase Dc and a second display phase Dd, the first display phase Dc includes an original display phase and an increased idle time, the first display phase Dc is used for outputting display signals, and the increase of the output time of the display signals can meet the requirement of the touch display panel 10 on a high display charging rate, thereby ensuring the display effect of the touch display panel 10.
Further, as shown in fig. 2, the number of the display sub-pixel rows receiving the display signal in the first display phase Dc is equal to the number of the display sub-pixel rows receiving the display signal in the second display phase Dd, and the spare time reserved by the overlapping of the first touch phase T1 and the display precharge phase V in time sequence is increased to the first display phase Dc, so that the driving duration of the display driving circuit 220 for the first display phase Dc is longer than the driving duration for the second display phase Dd. Or, the number of the display sub-pixel rows receiving the display signal in the first display stage Dc is less than the number of the display sub-pixel rows receiving the display signal in the second display stage Dd, and the spare time reserved by the time sequence overlapping of the first touch stage T1 and the display precharge stage V is increased to the first display stage Dc, so that the driving time of the display driving circuit 220 to the first display stage Dc is longer than the driving time to the second display stage Dd.
Further, in the first display phase Dc, the time for receiving the display signal by any two display sub-pixel rows is the same; alternatively, in the first display phase Dc, the time during which part of the display sub-pixel rows receive the display signal is longer than the time during which the remaining display sub-pixel rows receive the display signal.
Specifically, in the whole display stage D, the display signals are output to all the display sub-pixel rows of the touch display panel 10, and the first display stage Dc and the second display stage Dd realize that all the display sub-pixels receive the display signals one by one. The first display phase Dc increases the idle time on the basis of the original display phase, and the idle time is used for increasing the time for receiving the display signal at the corresponding display sub-pixel.
For example, the free time may be uniformly allocated to the time for each display sub-pixel row in the first display phase Dc to receive the display signal, that is, the time for any two display sub-pixel rows to receive the display signal is the same, so as to ensure that each display sub-pixel row in the first display phase Dc has sufficient time to receive the display signal, and ensure that the display effect at the position corresponding to the first display phase Dc is good. Alternatively, the idle time may be allocated unevenly to the time for each row of display sub-pixels to receive the display signal in the first display phase Dc, that is, the time for a part of the display sub-pixel rows to receive the display signal is longer than the time for the rest of the display sub-pixel rows to receive the display signal, for example, the idle time may be allocated to the display sub-pixels with higher requirement on the display charging rate, so as to ensure that the display sub-pixels with higher requirement on the display charging rate have sufficient time to receive the display signal, thereby ensuring the display effect of the part of the sub-pixel rows.
Fig. 11 is a schematic diagram of another frame synchronization signal of the touch display panel provided in fig. 2, and referring to fig. 2 and fig. 11, in two image frames Tt out of the plurality of image frames Tt, the touch signals output by the touch driving circuit 230 in the touch phase T are the same, and the touch signals output in the display precharge phase V are the same.
Specifically, the timing control circuit 210 provides frame synchronization signals for different image frames Tt, and each image frame Tt includes a display stage D, a touch stage T, and a display precharge stage V. In order to increase the output time of the display signal, a display pre-charge phase V and a touch phase T are set in each image frame Tt to overlap in terms of time sequence, and the spare time reserved in each image frame Tt can be used for outputting the display signal. In order to ensure uniformity of the display effect and the touch effect, the touch display panel 10 may keep the adjustment on the timing of the touch stage T in each image frame Tt consistent, that is, in different image frames Tt, the touch stage T and the display pre-charge stage have the same overlapping timing, that is, in different image frames Tt, the touch signals output by the touch driving circuit 230 in the touch stage T are the same, and the touch signals output in the display pre-charge stage V are the same, for example, the touch scanning signals are output in the touch stage T, and the touch noise detection signals are output in the display pre-charge stage V. For example, as shown in fig. 11, two image frames Tt are taken as an example for description, in each image frame Tt, a touch phase T4 overlaps with a second sub-display pre-charge phase VFP in terms of time sequence, and a free time is left for increasing the time of the display phase D4 and increasing the time for outputting a display signal. It should be noted that, the embodiment of the present invention does not specifically limit the specific timing overlapping adjustment manner of the touch control phase T and the display precharge phase V in each image frame Tt.
As shown in fig. 3 to 11, in terms of timing, at least one touch stage T is disposed between two adjacent display stages D.
Specifically, in the time sequence, at least one touch stage T is arranged between two adjacent display stages D, and at least one display stage D is arranged between two adjacent touch stages T, so that the display stages D are prevented from being concentrated in the time sequence, and the touch stages T are prevented from being concentrated in the time sequence, so that longer time intervals among the display stages in different image frames are prevented, and longer time intervals among the touch stages in different image frames are prevented, and the display effect and the touch effect of the touch display panel 10 are ensured. For example, as shown in fig. 3 to 14, one touch stage T is set between every two display stages D, and one display stage D is set between every two touch stages T. The specific setting modes of the display stage D and the touch stage T are not limited, and it is only required to ensure that at least one touch stage T is arranged between two adjacent display stages D, and at least one display stage D is arranged between two adjacent touch stages T.
Further, the specific setting mode of the display stage and the touch stage may be set according to the refresh frequency of the display and the refresh frequency of the touch. Specifically, fig. 12 is a schematic diagram of another frame synchronization signal of the touch display panel provided in fig. 2, and fig. 13 is a schematic diagram of another frame synchronization signal of the touch display panel provided in fig. 2, and referring to fig. 2, 12 and 13, an image frame Tt includes a display frame and a touch frame, the display frame includes a plurality of display phases D, and the touch frame includes a plurality of touch phases T; the refreshing frequency of the display frame is N hz/s, the refreshing frequency of the touch frame is M hz/s, wherein N and M are positive integers; N/M is a positive integer, and in time sequence, a touch stage T is arranged between every N/M display stages D; or M/N is a positive integer, and in time sequence, one display stage D is arranged between every M/N touch control stages T.
Specifically, the touch driving circuit 230 performs a touch scan on all touch electrodes in the touch display panel 10 in each touch frame, and all display sub-pixels in the touch display panel 10 in each display frame receive a display signal in one pass. The refresh frequency of the display frame refers to the refresh frequency of each display frame in each second, and the refresh frequency of the touch frame refers to the refresh frequency of the touch frame T in each second.
Furthermore, the refreshing frequency of the display frame is N hz/s, and the refreshing frequency of the touch frame is M hz/s, wherein N and M are positive integers. For example, the refresh frequency of the display frame may be 120hz/s, and the refresh frequency of the touch frame may be 240 hz/s; or, the refresh frequency of the display frame may be 240hz/s, and the refresh frequency of the touch frame is 120hz/s, and the specific values of the refresh frequency of the display frame and the refresh frequency of the touch frame are not limited in the embodiment of the present invention.
Further, as shown in fig. 12, when N/M is a positive integer, a touch stage T is arranged between every N/M display stages D in time sequence. Illustratively, N is 240hz/s, M is 120hz/s, N/M is 2, the number of display stages D is greater than the number of touch stages T, and one touch stage T is arranged between every two display stages D. Alternatively, as shown in fig. 13, when M/N is a positive integer, a display stage D is arranged between every M/N touch stages T in time sequence. Illustratively, N is 120hz/s, M is 240hz/s, M/N is 2, the number of touch phases T is greater than the number of display phases D, and one display phase D is arranged between every two touch phases T. The time sequence arrangement of the display stage D and the touch stage T in each image frame Tt is adaptively adjusted based on the refresh frequency of the display frame and the refresh frequency of the touch frame, so as to ensure that the touch display panel 10 has a better display effect and touch effect.
On the basis of the above embodiments, with continued reference to fig. 2 and fig. 3, the touch display panel 10 includes a display area 100 and a non-display area 110, and the non-display area includes a first non-display area 111 and a second non-display area 112; the display area 100 includes a plurality of rows a of display sub-pixels arranged in an array, the first non-display area 111 includes at least one row B of first dummy sub-pixels, and the second non-display area 112 includes at least one row C of second dummy sub-pixels; the display driving circuit 220 is used for sequentially outputting display signals to the plurality of display sub-pixel rows a in the display phase D, outputting dummy display signals to the first dummy sub-pixel row B in the first sub-display pre-charge phase VBP, and outputting dummy display signals to the second dummy sub-pixel row C in the second sub-display pre-charge phase VFP.
Specifically, the touch display panel 10 includes a display area 100 and a non-display area 110, the display area 100 includes a plurality of rows of display sub-pixel rows a, the display sub-pixels receive display signals for implementing a display function of the touch display panel 10, the non-display area 110 includes at least one row of virtual sub-pixel rows, and the virtual sub-pixels are configured to receive virtual display signals. Specifically, the non-display area 110 includes a first non-display area 111 and a second non-display area 112, the first non-display area 111 and the second non-display area 112 are respectively located at two ends of the display area 100, the first non-display area 111 includes at least one row of a first virtual sub-pixel row B, and the second non-display area 112 includes at least one row of a second virtual sub-pixel row C. Illustratively, as shown in fig. 2, the first non-display area 111 includes two rows of first virtual sub-pixel rows B, and the second non-display area 112 includes two rows of second virtual sub-pixel rows C.
Further, the display driving circuit 220 sequentially outputs the display signals to the plurality of display sub-pixel rows a in the display area 100 in the display stage D, that is, the display driving circuit 220 outputs the display signals to all the display sub-pixel rows a one by one in different display stages D. The display driving circuit 220 outputs dummy display signals to the dummy sub-pixel rows during the display pre-charge period V, i.e., outputs dummy display signals to the first dummy sub-pixel row B during the first sub-display pre-charge period VBP, and outputs dummy display signals to the second dummy sub-pixel row C during the second sub-display pre-charge period VFP. The display driving circuit 220 completes outputting the display signals to all the display sub-pixel rows a in the touch display panel 10 and completes outputting the virtual display signals to all the virtual display sub-pixel rows in the touch display panel 10 in each image frame Tt. Furthermore, the virtual display sub-pixel row can be used as a test sub-pixel row in the touch display panel for testing the performance of the touch display panel; alternatively, the virtual display signals required for virtually displaying the sub-pixel rows may be multiplexed as the display signals in the display sub-pixel rows, and taking the sub-pixels included in the display sub-pixel rows as the organic light emitting diode sub-pixels and the pixel circuits thereof as 7T1C pixel circuits as an example, the scan signals required for virtually displaying the sub-pixel rows may be multiplexed as the scan signals in the display sub-pixel rows.
Based on the same inventive concept, an embodiment of the present invention further provides a driving method of a touch display panel, where the touch display panel includes a plurality of image frames, each image frame includes a plurality of display stages, a plurality of touch stages and a display pre-charging stage, fig. 14 is a flowchart of the driving method of the touch display panel according to the embodiment of the present invention, as shown in fig. 14,
the driving method includes:
and S110, in the display stage, performing display driving operation on the touch display panel.
Illustratively, the display driving circuit includes a display driving circuit that outputs a display signal in a display stage to complete a display driving operation of the touch display panel.
S120, in the touch stage, a first touch driving operation is performed on the touch display panel.
For example, the driving circuit includes a touch driving circuit that outputs a touch signal in a touch stage to complete a touch driving operation of the touch display panel.
S130, in the display pre-charging stage, pre-charging operation is carried out on the touch display panel, and meanwhile, second touch driving operation is carried out on the touch display panel.
For example, the display driving circuit outputs the dummy display signal in the display precharge stage, and the touch driving circuit outputs the touch signal in the display precharge stage, so that the touch stage is shifted to the display precharge stage in time sequence to provide more time for outputting the display signal in the display stage. Further, the first touch driving may be to perform touch scanning on part of the touch electrodes of the touch display panel, and the second touch driving may be to perform touch scanning on the rest of the touch electrodes of the touch display panel, or the first touch driving may be to perform touch scanning on all the touch electrodes of the touch display panel, and the second touch driving may be to perform touch noise detection on the touch display panel, or the first touch driving may be to perform touch scanning on part of the touch electrodes of the touch display panel, and the second touch driving may be to perform touch scanning and noise detection on the rest of the touch electrodes of the touch display panel.
It should be noted that, the sequence of the step S110, the step S120, and the step S130 may be adjusted, and the display driving operation, the first touch driving operation, the pre-charging operation, and the second touch driving operation may be performed in sequence, the first touch driving operation, the pre-charging operation, the second touch driving operation, and the display driving operation may be performed in sequence, and the display driving operation, the pre-charging operation, the second touch driving operation, and the first touch driving operation may be performed in sequence, which is not limited in the embodiment of the present invention.
In summary, the driving method of the touch display panel according to the embodiment of the invention performs the precharge operation on the touch display panel and performs the second touch driving operation on the touch display panel at the same time in the display precharge stage, that is, the display precharge stage is used for outputting the virtual display signal and the touch signal, that is, the display precharge stage and the touch stage overlap in time sequence, so as to save the time occupied by the frame synchronization signal in the whole image frame in the touch stage, provide the saved time for the display stage to output the display signal, and increase the time occupied by the frame synchronization signal in the whole image frame in the display stage. The time of the display stage in the whole image frame is correspondingly increased by adjusting the time of the touch control stage and the display stage, the time of display driving is increased, the writing effect of the display signal is increased, the display effect of the touch control display panel is ensured, meanwhile, the touch control signal is ensured not to interfere the display signal, and the normal display effect of the touch control display panel is not influenced.
Based on the same inventive concept, an embodiment of the present invention further provides a touch display device, and fig. 15 is a schematic structural diagram of the touch display device provided in the embodiment of the present invention, and as shown in fig. 15, the touch display device 1 includes the touch display panel 10 described in any of the embodiments above, so that the touch display device 1 provided in the embodiment of the present invention has the corresponding beneficial effects in the embodiments above, and details are not repeated here. For example, the touch display device 1 may be an electronic device such as a mobile phone, a computer, a smart wearable device (e.g., a smart watch), and a vehicle-mounted display device, which is not limited in the embodiment of the present invention. Optionally, the touch display panel 100 includes a liquid crystal display panel or an organic light emitting display panel.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (16)
1. The touch display panel is characterized by comprising a driving circuit, wherein the driving circuit comprises a time sequence control circuit, a display driving circuit and a touch driving circuit;
the time sequence control circuit is used for providing a frame synchronization signal for each image frame, and the frame synchronization signal comprises a plurality of display stages, a plurality of touch stages and a display pre-charging stage;
the display driving circuit is used for outputting a display signal in the display stage and outputting a virtual display signal in the display pre-charging stage;
the touch driving circuit is used for outputting a touch signal in the touch stage and the display pre-charging stage.
2. The touch display panel according to claim 1, further comprising a plurality of touch electrodes;
the touch control driving circuit is used for outputting a touch control signal to perform touch control scanning on a first part of the touch control electrodes in the touch control stage, and outputting the touch control signal to perform touch control scanning on a second part of the touch control electrodes in the display pre-charging stage.
3. The touch display panel according to claim 1, wherein the touch display panel comprises a plurality of touch electrodes;
the touch control driving circuit is used for outputting a touch control signal to carry out touch control scanning on the touch control electrode in the touch control stage and outputting the touch control signal to carry out noise detection on the touch control display panel in the display pre-charging stage.
4. The touch display panel according to claim 1, wherein the touch display panel comprises a plurality of touch electrodes;
the touch driving circuit is used for outputting a touch signal to perform touch scanning on a first part of the touch electrodes in the touch stage, outputting a touch signal to perform touch scanning on a second part of the touch electrodes in the display pre-charging stage and performing touch noise detection on the touch display panel.
5. The touch display panel of claim 1, wherein the display pre-charge phase comprises a first sub-display pre-charge phase and a second sub-display pre-charge phase in the same image frame; in terms of time sequence, the first sub-display pre-charging stage is positioned before any display stage, and the second sub-display pre-charging stage is positioned after any display stage;
the display driving circuit is used for outputting virtual display signals in the first sub-display pre-charging stage and the second sub-display pre-charging stage;
the touch driving circuit is used for outputting a touch signal in the first sub-display pre-charging stage and/or the second sub-display pre-charging stage.
6. The touch display panel according to claim 5, wherein the touch phases include a touch noise detection phase and a touch scan phase;
the multiple touch control scanning stages in the same image frame comprise a first touch control scanning stage, in time sequence, the first touch control scanning stage is positioned before any other touch control scanning stage, and the touch control noise detection stage is positioned after any touch control scanning stage;
the first touch scanning stage and the first sub-display pre-charging stage are overlapped in time sequence, and/or the touch noise detection stage and the second sub-display pre-charging stage are overlapped in time sequence.
7. The touch display panel of claim 5, wherein the touch phases include a touch noise detection phase and a touch scanning phase;
the touch scanning stages in the same image frame comprise a second touch scanning stage, and in time sequence, the second touch scanning stage is positioned after any other touch scanning stage, and the touch noise detection stage is positioned before any touch scanning stage;
the touch noise detection stage and the first sub-display pre-charge stage are overlapped in time sequence, and/or the second touch scanning stage and the second sub-display pre-charge stage are overlapped in time sequence.
8. The touch display panel of claim 1, wherein the touch phases include a first touch phase, and the first touch phase overlaps with the display precharge phase in time sequence;
the pulse number of the touch signals output by the touch driving circuit in the first touch stage is less than or equal to the pulse number of the touch signals output in any other touch stage.
9. The touch display panel of claim 1, wherein the plurality of display phases includes a first display phase and a second display phase;
the number of display sub-pixel rows receiving display signals in the first display phase is equal to or less than the number of display sub-pixel rows receiving display signals in the second display phase;
the driving time of the display driving circuit for the first display stage is longer than the driving time for the second display stage.
10. The touch display panel according to claim 9, wherein in the first display phase, the time for receiving the display signal by any two of the display sub-pixel rows is the same;
or, in the first display stage, the time for receiving the display signal by a part of the display sub-pixel rows is longer than the time for receiving the display signal by the other part of the display sub-pixel rows.
11. The touch display panel according to claim 1, wherein in two image frames among the plurality of image frames, the touch driving circuit outputs the same touch signal in the touch phase and outputs the same touch signal in the display precharge phase.
12. The touch display panel according to claim 1, wherein at least one touch stage is arranged between two adjacent display stages in time sequence.
13. The touch display panel of claim 12, wherein the image frame comprises a display frame and a touch frame, the display frame comprising a plurality of the display phases, the touch frame comprising a plurality of the touch phases; the refreshing frequency of the display frame is N hz/s, the refreshing frequency of the touch frame is M hz/s, and both N and M are positive integers;
N/M is a positive integer, and one touch stage is arranged between every N/M display stages in time sequence; or M/N is a positive integer, and one display stage is arranged between every M/N touch stages in time sequence.
14. The touch display panel according to claim 5, wherein the touch display panel includes a display area and a non-display area, and the non-display area includes a first non-display area and a second non-display area;
the display area comprises a plurality of rows of display sub-pixels arranged in an array, the first non-display area comprises at least one row of first virtual sub-pixel rows, and the second non-display area comprises at least one row of second virtual sub-pixel rows;
the display driving circuit is used for sequentially outputting display signals to a plurality of rows of the display sub-pixel rows in the display stage, outputting virtual display signals to the first virtual sub-pixel row in the first sub-display pre-charging stage, and outputting virtual display signals to the second virtual sub-pixel row in the second sub-display pre-charging stage.
15. A driving method of a touch display panel for driving the touch display panel according to any one of claims 1 to 14, wherein the touch display panel comprises a plurality of image frames, each of the image frames comprising a plurality of display phases, a plurality of touch phases and a display precharge phase;
the driving method includes:
in the display stage, performing display driving operation on the touch display panel;
in the touch control stage, performing first touch control driving operation on the touch control display panel;
and in the display pre-charging stage, pre-charging operation is carried out on the touch display panel, and meanwhile, second touch driving operation is carried out on the touch display panel.
16. A touch display device comprising the touch display panel according to any one of claims 1 to 14.
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