CN114327142A

CN114327142A - Driving method and driving device of touch display device and touch display device

Info

Publication number: CN114327142A
Application number: CN202111644036.XA
Authority: CN
Inventors: 陈锦兴; 马郁平; 黄建才
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-04-12
Anticipated expiration: 2041-12-29
Also published as: CN114327142B

Abstract

The embodiment of the invention discloses a driving method of a touch display device, a driving device of the touch display device and the touch display device, wherein the driving method of the touch display device comprises a plurality of image frames; the same image frame comprises a touch control stage and a display stage; in the touch control stage, providing touch control scanning signals to the touch control units, and receiving touch control detection signals of the touch control units in a one-to-one correspondence manner; in the display stage, display driving is carried out on the display unit; the touch control stage of the same image frame comprises M touch control frames; the touch frame comprises at least one touch sub-stage; in the same image frame, the value range of the proportion K of the total duration of the touch stage to the total duration of the display stage is as follows: k is more than or equal to 0.5M/(16.67-0.5M) and less than or equal to 5.56-M), and M is more than or equal to 1. According to the embodiment of the invention, the time length of the touch control stage in the image frame is shortened, and the time length of the display stage in the image frame is relatively increased, so that the touch control and display requirements of the touch control display device are met.

Description

Driving method and driving device of touch display device and touch display device

Technical Field

The embodiment of the invention relates to the technical field of display, in particular to a driving method of a touch display device, a driving device of the touch display device and the touch display device.

Background

With the progress and development of touch sensing technology, touch displays have been widely applied to various electronic devices to replace conventional input devices such as keyboards and mice by touch sensing technology, thereby realizing a more direct human-computer interface.

In the prior art, a touch display device with dual functions of touch control and display is driven by performing touch sensing at a Vertical Blanking (Vertical Blanking) interval of a display driver. However, in order to provide sufficient touch sensing time, the vertical blanking interval needs to be widened, and in the case that the Frame Rate (Frame Rate) is fixed, the transmission Rate of the display data needs to be greatly increased, which will have higher requirements on the transmission lines, the bus bars, the display driving chips, and the like in the touch display device, thereby increasing the cost of the touch display device invisibly.

Disclosure of Invention

The embodiment of the invention provides a driving method of a touch display device, a driving device of the touch display device and the touch display device, which are used for reducing the time length of a touch stage in an image frame, so that the time length of a display stage in the image frame is favorably increased, the display quality is favorably improved, and the cost is reduced.

In a first aspect, an embodiment of the present invention provides a driving method for a touch display device, configured to drive the touch display device, where the touch display device includes a touch display panel, and the touch display panel includes a plurality of display units and a plurality of touch units; the driving method of the touch display panel comprises a plurality of image frames; the same image frame comprises a touch control stage and a display stage;

in the touch control stage, providing touch control scanning signals to the touch control units, and receiving touch control detection signals of the touch control units in a one-to-one correspondence manner;

in the display stage, performing display driving on the display unit;

wherein the touch stage of the same image frame comprises M touch frames; the touch frame comprises at least one touch sub-stage; in the same image frame, the value range of the ratio K of the total duration of the touch stage to the total duration of the display stage is as follows: k is more than or equal to 0.5M/(16.67-0.5M) and less than or equal to 5.56-M), and M is more than or equal to 1.

In a second aspect, an embodiment of the present invention further provides a driving device for a touch display device, configured to drive the touch display device, where the touch display device includes a touch display panel, and the touch display panel includes a plurality of display units and a plurality of touch units; the driving device of the touch display panel comprises a display driving module and a touch driving module;

the touch driving module is used for providing touch scanning signals to the touch units in the touch stage of the image frame and receiving touch detection signals of the touch units in a one-to-one correspondence manner;

the display driving module is used for driving the display unit to display in the display stage of the image frame;

In a third aspect, an embodiment of the present invention further provides a touch display device, including: the display device comprises a touch display panel and a driving circuit;

the touch display panel comprises a plurality of display units and a plurality of touch units;

the driving circuit is used for driving the touch display panel and executing the driving method of the touch display device.

The driving method of the touch display device, the driving device thereof and the touch display device provided by the embodiment of the invention set the ratio K of the total duration of the touch stage to the total duration of the display stage in the same image frame to be not less than 0.5M/(16.67-0.5M) and not more than K and not more than M/(5.56-M), wherein M is not less than 1, so that the time occupied by the touch stage in the same image frame is less, and the time occupied by the display stage in the image frame is relatively more, thereby shortening the time length of the touch stage in the image frame, relatively increasing the time length of the display stage in the image frame, reducing the setting requirements on signal lines and devices used for display driving in the touch display panel on the premise of ensuring the charging duration and electric quantity requirements of each display unit, and further being beneficial to improving the display quality of the touch display device, the cost of the touch display device is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a touch display device according to an embodiment of the present invention;

fig. 2 is a driving timing diagram of a touch display device according to an embodiment of the invention;

fig. 3 is a flowchart of a driving method of a touch display device according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a touch scan signal according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of another touch display device according to an embodiment of the present invention;

FIG. 6 is a driving timing sequence of a prior art touch display device;

fig. 7 is a driving timing diagram of a touch display device according to an embodiment of the invention;

fig. 8 is a schematic structural diagram of another touch display device according to an embodiment of the present invention;

fig. 9 is a timing diagram illustrating a driving sequence of another touch display device according to an embodiment of the invention;

fig. 10 is a flowchart of a driving method of a touch sub-stage of a touch display panel according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a driving device of a touch display panel 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 is to be further noted that, for the convenience of description, only a part of the structure relating to the present invention is shown in the drawings, not the whole structure.

Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the steps as a sequential process, many of the steps can be performed in parallel, concurrently or simultaneously. In addition, the order of the steps may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like.

The embodiment of the invention provides a driving method of a touch display device, which is used for driving the touch display device. Fig. 1 is a schematic structural diagram of a touch display device according to an embodiment of the present invention, fig. 2 is a timing diagram of driving the touch display device according to the embodiment of the present invention, and fig. 3 is a flowchart of a driving method of the touch display device according to the embodiment of the present invention. As shown in fig. 1, the touch display device 200 includes a touch display panel 100, and the touch display panel 100 includes a plurality of display units 20 and a plurality of touch units 10. As shown in fig. 2, the driving method of the touch display device according to the embodiment of the invention includes a plurality of image frames MP; the same image frame MP includes a touch phase T0 and a display phase T1; as shown in fig. 3, a driving method of a touch display device according to an embodiment of the present invention includes:

s110, in the touch control stage, touch control scanning signals are provided for the touch control units, and touch control detection signals of the touch control units are received in a one-to-one correspondence mode.

Specifically, as shown in fig. 1, the touch unit 10 may be a mutual capacitive touch unit or a self capacitive touch unit. When the touch unit 10 is a self-capacitance touch unit, the touch unit 10 may include a touch electrode corresponding to a determined coordinate position and forming a capacitance with the ground, and when the touch object touches the touch surface of the touch display panel, the capacitance of the touch object will be superimposed on the touch electrode covered by the touch area, so that the capacitance to ground of the touch electrode covered by the touch object changes, that is, the touch detection signal fed back by each touch electrode changes, therefore, after the touch scanning signal is provided to the touch electrode of the touch unit, the touch detection signal fed back by the touch electrode of the touch unit is obtained, so as to determine whether the capacitance to ground of the touch electrode changes, and then the specific touch position of the touch object can be determined according to the coordinate value corresponding to the touch electrode with the capacitance to ground changing. When the touch unit 10 is a mutual capacitance touch unit, the touch unit 10 may include a touch driving electrode and a touch sensing electrode, wherein projections between the touch driving electrode and the touch sensing electrode overlap, and a capacitance is formed at a crossing position of the two groups of electrodes, when a touch object touches the touch display panel, a coupling capacitance between the two electrodes near a touch point is affected, i.e. a capacitance between the two electrodes is changed, by providing a touch scanning signal to the touch driving electrode of the same touch unit 10 and receiving a touch detection signal fed back from the touch sensing electrode of the touch unit 10, a capacitance value of an intersection point of the touch driving electrode and the touch sensing electrode of the touch unit 10 is obtained, and according to a capacitance variation of the touch unit 10, it can be determined whether a coordinate value corresponding to the touch unit 10 is a coordinate value of the touch point, and then determining the touch position of the touch object. It should be noted that, the specific structure of the touch unit 10 in this embodiment may be set according to actual situations, and this is not specifically limited in this embodiment of the present invention.

Referring to fig. 1 and fig. 2, when the touch stage T0 includes at least one touch sub-stage TPC, touch scan signals are simultaneously provided to the same set of touch units in the touch display panel 100 in one touch sub-stage TPC, and touch detection signals fed back by the touch units 10 are received in a one-to-one correspondence manner. The same group of touch units may include a plurality of touch units located in the same row, or may include a plurality of touch units located in different rows, which is not specifically limited in the embodiment of the present invention.

And S120, in the display stage, performing display driving on the display unit.

Specifically, with reference to fig. 1, the touch display panel 100 may further include a plurality of scan signal lines and a plurality of data signal lines (not shown), the display units 20 in the same row may share the scan signal lines, and the display units 20 in the same column may share the data signal lines. By sequentially supplying scanning signals to the scanning signal lines, the data signals transmitted by the data signal lines are written into the display units 20 in a one-to-one correspondence manner, so that the display units 20 are controlled to emit light for displaying a frame image corresponding to the image frame.

With reference to fig. 1 and fig. 2, the touch stage of the same image frame MP includes M touch frames TP; in the same image frame MP, the value range of the ratio K between the total duration of the touch stage T0 and the total duration of the display stage T1 is: k is more than or equal to 0.5M/(16.67-0.5M) and less than or equal to 5.56-M), and M is more than or equal to 1.

Specifically, the touch display panel 100 may be a liquid crystal touch display panel or an organic light emitting touch display panel, which is not limited in the embodiment of the present invention. Generally, to reduce the cost and simplify the process, the touch units are integrated into the touch display panel 100, and the display period T1 and the touch period T0 are performed in time-sharing manner to prevent the touch units 10 integrated into the touch display panel 100 from affecting the display light emission of the display units 20. When the image refresh frequency of the touch display panel 100 is the determined refresh frequency, the time required for displaying one frame of image is a fixed value, which is the sum of the total duration of the touch phase T0 and the total duration of the display phase T1 in the same image frame MP. When the time of the touch phase T0 of the same image frame is longer, the time of the display phase T1 is relatively shorter, which makes the time for writing data allocated to each display unit 20 shorter, which may cause the data signal written in the display unit 20 to be insufficient to support the display requirement of the whole image frame, and seriously may make the charging time of each display unit 20 insufficient to affect the display luminance of the display unit 20, thereby affecting the accuracy of the displayed image of the touch display panel; if the display unit 20 is charged with enough power in a short time, a high-demand signal line, a driving circuit, etc. is required to quickly transmit the display signal to the display unit 20, which increases the cost of the touch display device 100.

According to the embodiment of the invention, the proportion K of the total duration of the touch control stage to the total duration of the display stage in the same image frame is set to be more than or equal to 0.5M/(16.67-0.5M) and less than or equal to K/(5.56-M), and M is more than or equal to 1, so that the time occupied by the touch control stage in the same image frame is less, and the time occupied by the display stage in the image frame is relatively more, thereby shortening the time length of the touch control stage in the image frame, relatively increasing the time length of the display stage in the image frame, reducing the setting requirements on signal lines and devices used for display driving in a touch control display panel on the premise of ensuring the charging duration and the electric quantity requirements of each display unit, further being beneficial to improving the display quality of the touch control display device and reducing the cost of the touch control display device.

Illustratively, when the refresh frequency of the touch display panel 100 is any one of 60Hz, 90Hz, 120Hz, and 180Hz, the maximum value of the time required to display one frame of image is 16.67ms and the minimum value is 5.56 ms. If the time Ttp required for one touch frame is greater than or equal to 0.5ms and less than or equal to 1 ms, when the touch phase T0 of the same image frame MP includes M touch frames, the total duration Tp of the touch phase T0 of the same image frame MP is greater than or equal to 0.5M ms and less than or equal to Tp and less than or equal to M ms, and the total duration Td of the display phase T1 of the same image frame MP is greater than or equal to 5.56ms-M ms and less than or equal to Td and less than or equal to 16.67 ms-0.5M ms. Thus, it can be determined that, in the same image frame MP, the value range of the ratio K of the total duration Tp of the touch phase T0 to the total duration Td of the display phase T1 is: k is more than or equal to 0.5M/(16.67-0.5M) and less than or equal to 5.56-M). The value range of M may be any value greater than or equal to 1, for example, M may be equal to 1, 1.5, 2, 3, 4, and …, which is not specifically limited in this embodiment of the present invention.

It is understood that one image frame is the time required for displaying one image frame, touch scanning may be performed on the touch units during the period of displaying one image frame, a touch phase of the same image frame may include M touch frames, and one touch frame is the time required for scanning all the touch units in the touch display panel at one time, so that the touch phase of the same image frame may include a plurality of touch frames to have a higher touch pointing rate. Each touch frame may include one or more touch sub-phases, in each of which a same set of touch units is scanned.

Optionally, with continuing to refer to fig. 1 and fig. 2, the same touch frame TP should include a Noise detection stage Noise in addition to at least one touch sub-stage TPC; in the Noise detection stage Noise, Noise detection is performed on the touch display panel 100 to obtain a Noise detection signal. Accordingly, when the touch position of the touch object is determined according to the touch detection signal fed back by each touch unit 10, the touch position of the touch object may be determined by combining the touch detection signal fed back by each touch unit and the noise detection signal.

Therefore, Noise detection is carried out at the Noise detection stage, and then the touch position is determined according to the obtained touch detection Noise signal and the touch detection signal, so that the influence of background Noise on the touch detection signal is avoided, and the accuracy of touch position detection is improved.

It should be noted that, during the period of displaying one frame of image, touch scanning may be performed on the touch units and display driving may be performed on the display units in a time-sharing manner, during the period of displaying one frame of image, display driving may be performed on all the display units, and the stage of driving each display unit may be inserted between the touch sub-stages of performing touch scanning on the touch units.

Optionally, referring to fig. 1 and fig. 2 in combination, the touch display panel 100 includes a plurality of sub-display regions, and the same sub-display region includes a plurality of display units 20; the display phase T1 comprises at least one display sub-phase DP; in the same image frame MP, a touch sub-stage TPC and a display sub-stage DP are alternately performed; in the display sub-phase DP, the display unit 20 in the same sub-display region is driven for display; in the same image frame MP, the display units 20 in different sub-display areas are driven by different display sub-stages DP.

For example, the touch display panel may include a plurality of sub-display regions, for example, adjacent rows of display units 20 may belong to the same sub-display region; at this time, the display driving stage includes a plurality of display sub-stages DP, and the display sub-stages DP and the touch driving stage TPC are arranged at intervals. In a display sub-stage DP, performing time-division display driving on the display units 20 in each row of a sub-display region; after a display sub-stage is finished, entering a touch sub-stage TPC, and performing touch scanning on a set of touch units 10 in the touch display panel in the touch driving stage TPC, namely providing touch scanning signals for the touch units 10 in the touch display panel; after one touch sub-stage TPC is finished, entering another display sub-stage DP, and so on, alternately performing the display sub-stage DP and the touch sub-stage TPC; thus, the display driving time of the display units 20 of different sub-display regions belong to different display sub-stages DP, and the display sub-stages DP and the touch sub-stages TPC are performed alternately, so as to improve the display uniformity of the display panel. The time duration of each touch sub-phase is the same, and the time duration of each display sub-phase is the same, that is, the time duration of each touch driving phase C may also be the same, so as to further improve the display uniformity of the touch display panel 100.

Optionally, in the same touch frame, the touch scan signal provided to the touch unit includes Q pulses; wherein Q is more than or equal to 6 and less than or equal to 15.

Specifically, fig. 4 is a schematic diagram of a touch scan signal according to an embodiment of the present invention, and as shown in fig. 4, the touch scan signal Vtx provided to the touch unit is usually a pulse signal with high and low level changes, so as to repeatedly charge and discharge the touch unit to implement a touch detection function. In one touch frame TP, touch scanning signals Vtx need to be provided to all the touch units, and touch detection signals fed back by the touch units are received in a one-to-one correspondence manner, so as to determine the touch position of the touch object according to the touch detection signals fed back by the touch units. At this time, the more the number of pulses in the touch scan signal Vtx is provided to the touch unit, the longer the time required for providing the touch scan signal Vtx to the touch unit, the longer the time required for completing one touch frame TP, and taking the example that the time length of one touch scan for one touch unit is the duration of one touch sub-stage TPC, i.e., the signal period of the touch scan signal Vtx provided to the touch unit is equal to the duration of one touch sub-stage TPC, in the prior art, the number of pulses in the touch scan signal provided to the touch unit in one signal period is usually greater than or equal to 20, and when one pulse period is t0, the time for performing one touch scan for one touch unit is greater than or equal to 20 t0, which is a longer time, and when one touch frame TP includes S touch sub-stages TPs, at least 20S t0 is completed, correspondingly, when the touch stage of the same image frame includes M touch frames, the total duration of the touch stages in the image frame is at least 20 × M × S × t 0. Wherein both M and S are greater than or equal to 1.

In the embodiment of the invention, the value range of the pulse number Q of the touch scanning signal Vtx provided for the touch unit is set to be more than or equal to 6 and less than or equal to 15, so that the value range of the time Tq required by one touch scanning for one touch unit is more than or equal to 6t0 and less than or equal to 15t 0; therefore, the time for providing the touch scanning signal to the touch unit can be reduced by reducing the pulse number of the touch scanning signal Vtx provided to the touch unit, so as to reduce the time required by the touch stage in the same image frame, which is beneficial to increasing the time of the display stage in the same image frame, reduce the setting requirements on signal lines and devices used for display driving in the touch display panel, meet the time requirement for providing the display signal to each display unit in the display stage, and further be beneficial to improving the display quality of the touch display device and reducing the cost of the touch display device.

For example, fig. 5 is a schematic structural diagram of another touch display device according to an embodiment of the present invention, and as shown in fig. 5, the touch display device 200 includes a touch display panel 100 and a driving circuit 300 disposed in a non-display area 102 of the touch display panel 100, where the driving circuit 300 is configured to provide a touch scanning signal to each touch unit 10 in a display area 101 of the touch display panel 100. In general, the driving circuit 300 is disposed in the non-display area 102 on one side of the display area 101, so that the distance between the driving circuit 20 and the touch units 10 at different positions in the touch display panel 100 is different, which may cause the attenuation of the touch scanning signal provided by the driving circuit 20 to each touch unit 10 and the received touch detection signal fed back by each touch unit 10 to be different, and when the difference of the touch scanning signal received by each touch unit 10 is larger, the detected touch detection signal fed back by the touch unit 10 is larger, which may affect the touch sensitivity, and the serious variation caused by the attenuation of the touch scanning signal may be regarded as the variation caused by the touch of the touch object, thereby causing the misjudgment of the touch position. In the embodiment of the present invention, when the number Q of pulses in the touch scan signal provided to the touch unit 100 is set to be equal to or greater than 6 and equal to or less than 15, the time required for the touch stage in the same touch frame is reduced on the premise of ensuring the touch accuracy. For example, when the number of pulses of the touch scan signal is equal to 8, the touch performance of the touch display panel is shown in table i. The first table is a touch performance verification table of the touch display panel provided by the embodiment of the invention.

Watch 1

As shown in table one, the numbers in the table represent 6 touch display panels in different batches or the same batch, that is, when the number of pulses of the touch scan signal is 8, the touch performance of the 6 touch display panels is verified. The signal-to-noise ratio of each touch display panel is greater than 40dB, touch scanning signals are respectively provided for each touch unit of each touch display panel, touch detection signals fed back by each touch unit are received, the accuracy of the touch detection signals fed back by the touch units at different positions in the same touch display panel is finally determined, and the purpose of verifying the touch performance of the touch display panel is achieved. Taking the #1 touch display panel as an example, the data corresponding to 1, 2, and 3 at the near end represents the touch detection signal fed back by the touch unit 10 closer to the driving circuit 300 in the #1 touch display panel 100, which may correspond to the touch unit 1, the touch unit 2, and the touch unit 3 in fig. 5, respectively; the data corresponding to the lower 4, 5, and 6 in the middle represents the touch detection signal fed back by the touch unit 10 located in the middle of the touch display panel in the #1 touch display panel 100, which may respectively correspond to the touch unit 4, the touch unit 5, and the touch unit 6 in fig. 5; the data under the remote end 7, 8, and 9 represent the touch detection signals fed back by the touch unit 10 located farther from the driving circuit 300 in the #1 touch display panel 100, which may correspond to the touch unit 7, the touch unit 8, and the touch unit 9 in fig. 5, respectively. As can be seen from table one, in the same touch display panel, the touch detection signals fed back by the remote, middle and near touch units 10 all have the strength that is kept strong, and when the ratio between the average value of the touch detection signals fed back by the remote touch unit 10 and the average value of the touch detection signals fed back by the near touch unit 10 and the ratio between the average values of the touch detection signals fed back by the near touch unit 10 is taken as the change rate of the touch scan signal, the change rate of the touch scan signal in the 6 touch display panels is less than 20%, so that when the number of pulses of the touch scan signal is 8, the touch detection accuracy of each touch display panel can be ensured.

On the contrary, if the number of pulses of the touch scan signal is further reduced to below 6, the touch performance requirement of the touch display panel may not be satisfied, and it is verified that, for example, when the number of pulses of the touch scan signal is 2, the touch scan signal received by the remote touch unit has a higher attenuation degree. Table two is a detection result when the touch scanning signal with the pulse number of 2 is provided to the touch units at different positions of the touch display panel, and table three is a detection result when the touch scanning signal with the pulse number of 8 is provided to the touch units at different positions of the touch display panel.

Watch two

	X7	X8	X9	X10
					Y1	3	10	12	7
Y2	18	101	115	39
					Y3	51	176	173	104
Y4	24	116	130	64

Watch III

	X7	X8	X9	X10
					Y1	36	96	113	57
Y2	207	533	558	307
					Y3	225	673	666	421
Y4	37	205	286	149

As can be seen from tables two and three, when the touch position of the touch object is the position of the touch unit at the far end, for example, the touch units located in the eighth column and the ninth column in the second row and the third row in the touch display panel, when the number of pulses for providing the touch scanning to the touch unit is 2, the attenuation rate of the touch scanning signal is large, so that the detected capacitance variation is small, and the signal is easily filtered as a noise signal, so that the touch position of the touch object cannot be determined. When the number of the pulses for providing touch scanning to the touch unit is 8, the attenuation rate of the touch scanning signal is small, so that the detected capacitance variation is large, the touch position of the touch object can be accurately determined according to the large variation, and the touch sensitivity and accuracy can be ensured.

Optionally, with continued reference to fig. 5, the touch display panel 100 includes a plurality of touch areas 110; the same touch area 110 includes a plurality of touch units 10(11, 12, 13, 14) arranged in sequence, and at this time, in the same touch sub-stage, touch scanning signals are simultaneously provided to at least two touch units 10 in the same touch area 110, and touch detection signals of the touch units 10 are received in a one-to-one correspondence manner; the time for applying the touch scanning signals by the touch units 10 with the same arrangement number in different touch areas 110 is overlapped.

Specifically, fig. 6 is a driving timing sequence of a touch display device of the prior art, and referring to fig. 5 and 6 in combination, taking the case that each touch area 110 includes four adjacent touch units 10 in the same row, that is, the same touch area 110 includes a touch unit 11, a touch unit 12, a touch unit 13 and a touch unit 14 arranged in sequence, in the same touch sub-stage TPC' of the prior art, a touch scan signal is provided to one touch unit 10 in the same touch area 110, and receives the touch detection signal fed back by the touch unit 10, and the time for providing the touch scanning signal to the touch units 10 of different touch areas 110 may be the same time, for example, in the touch sub-stage MUX1', a touch scan signal is simultaneously provided to the touch units 11 of each touch area 110, and correspondingly receives the touch detection signals fed back by the touch units 11 of the touch areas 110. Thus, when each touch area 110 includes four touch units 10(11, 12, 13, 14), at least four touch sub-phases TPC 'are required for a touch frame TP' (MUX1', MUX2', MUX3', and MUX4'), and if a Noise detection phase Noise 'is added to each touch frame TP', the touch frame TP 'is equivalent to include 5 touch sub-phases TPC'; and when the touch stage of the same image frame MP 'includes M touch frames TP', the image frame MP 'at least includes 4M + M touch sub-stages TPC', and for example, the touch stage of one image frame MP 'includes 2 touch frames TP', the same image frame MP 'at least includes 10 touch sub-stages TPC'. When the time required for each touch sub-phase TPC 'is t1, the time required for the touch phase in the same image frame MP' is 10 × t1, which makes the touch phase require a longer time, thereby relatively shortening the time of the display phase.

Fig. 7 is a driving timing chart of a touch display device according to an embodiment of the invention, and referring to fig. 5 and fig. 7 in combination, the TPC provides the touch scan signals to two touch units 10 in the touch area 110 at the same time in the same touch sub-phase, and receives the touch detection signals fed back by the touch units 10 in a one-to-one correspondence, and the time for providing the touch scanning signals to the touch units 10 with the same arrangement serial number in different touch areas 110 is the same, for example, in a touch sub-stage MUX1, touch scan signals are simultaneously provided to touch units 11 and 12 of each touch area 110, and receives the touch detection signals fed back by the touch units 11 and 12 of each touch area 110 in a one-to-one correspondence manner, in another touch sub-stage, MUX2, touch scan signals are simultaneously provided to touch cells 13 and 14 of each touch area 110, and receives the touch detection signals fed back by the touch units 13 and 14 of each touch area 110 in a one-to-one correspondence. Thus, when each touch area 110 includes four touch units 10(11, 12, 13, 14), one touch frame TP may include two touch sub-stages TPC (MUX1 and MUX2) for performing touch detection and one touch sub-stage TPC (noise) for performing noise detection, i.e., the touch frame TP includes 3 touch sub-stages TPC. When the touch phase T0 of the same image frame MP includes M touch frames TP, the same image frame NP only needs to include 2M + M touch sub-phases TPC, and for example, the touch phase T0 of one image frame MP includes 2 touch frames TP, the same image frame MP includes 6 touch sub-phases TPC. When the time required for each touch sub-phase TPC is T1, the time required for the touch phase T0 in the same image frame MP is 6 × T1, which greatly shortens the time required for the touch phase T0, and thus the time required for the display phase T1 can be relatively increased.

Optionally, when the touch stage of the same image frame includes N touch sub-stages, N may be a positive integer less than 9; and applying the touch scanning signal to the touch units with different arrangement serial numbers in the same touch area at different touch sub-stages of the same touch frame.

For example, with continuing reference to fig. 5 and 7, each touch area 110 includes four touch units 10 located in the same row, and the same touch sub-stage TPC provides the touch scan signal to two touch electrodes 10, in this case, the same touch frame TP may include two touch sub-stages TPC (MUX1 and MUX2) providing the touch scan signal. In the touch sub-stage MUX1, touch scan signals are simultaneously provided to the touch units 11 and 12 in each touch area 110, and touch detection signals fed back by the touch units 11 and 12 in each touch area 110 are received in a one-to-one correspondence manner; in the touch sub-stage MUX2, the touch scan signals are simultaneously provided to the touch units 13 and 14 in each touch area 110, and the touch detection signals fed back by the touch units 13 and 14 in each touch area 110 are received in a one-to-one correspondence manner.

It should be noted that, the above is only an exemplary technical solution of the embodiment of the present invention, and in the embodiment of the present invention, on the premise that the touch unit that provides the touch scan signal at different times in the prior art can be changed into the touch unit that provides the touch scan signal at the same time, the embodiment of the present invention does not specifically limit the number of the touch sub-stages included in the touch stage in the same image frame. Preferentially, one touch frame comprises a touch sub-stage, touch scanning signals are provided for all the touch units at the same time in the touch sub-stage, and touch detection signals fed back by all the touch units are received in a one-to-one correspondence manner; the total duration of the touch phases in the same image frame can now be compressed to the maximum.

It can be understood that, on the basis of the above embodiments, a person skilled in the art may divide the touch area in the touch display panel as needed, and the dividing manner of the touch area in the touch display panel is not specifically limited in the embodiments of the present invention.

For example, taking the example that the touch frame of the touch display panel includes three touch sub-stages, the table four is another touch performance verification table of the touch display panel provided in the embodiment of the present invention.

Watch four

Taking the touch display panel shown in fig. 5 as an example, it can be seen from table four that, when the same touch frame includes three touch sub-stages, in the same touch display panel 100, the touch detection signals fed back by the remote, middle and near touch units 10 all have the intensity that is kept strong, and the difference between the mean value of the touch detection signals fed back by the remote touch unit 10 and the mean value of the touch detection signals fed back by the near touch unit 10 is small, and the ratio of the difference to the mean value of the touch detection signals fed back by the near touch unit 10 is taken as the change rate of the touch scan signal, the change rate of the touch scan signals of all touch display panels is smaller than 20%, so that when the touch sub-stages of the same touch frame are shortened to three, the accuracy of touch detection of the touch display panel can be ensured.

Optionally, fig. 8 is a schematic structural diagram of another touch display device according to an embodiment of the present invention, and as shown in fig. 8, the touch display device further includes a driving circuit 300, where the driving circuit 300 includes a plurality of switch units 310 corresponding to the plurality of touch units 10 in the same touch area 110 one to one; the input terminal of the switch unit 310 receives the touch scan signal Vtx, and the output terminal of the switch unit 310 is electrically connected to the touch unit 10.

When the touch scanning signals are simultaneously provided to the at least two touch units in the same touch area at the same touch sub-stage, the at least two switch units 310 corresponding to the at least two touch units 10 in the same touch area 110 may be controlled to be simultaneously turned on at the same touch sub-stage, so that the touch scanning signals Vtx are simultaneously provided to the at least two touch units 10 in the same touch area 110 through the turned-on switch units 10.

For example, when the same touch area 110 includes four touch units 10, the driving circuit 300 may include four switch units 310, i.e., switch units 311, 312, 313 and 314. The input terminals of the switch units 311, 312, 313, and 314 receive the touch scan signal Vtx, the output terminal of the switch unit 311 is electrically connected to the touch electrode 11 of each touch region 110, the output terminal of the switch unit 312 is electrically connected to the touch electrode 12 of each touch region 110, the output terminal of the switch unit 313 is electrically connected to the touch electrode 13 of each touch region 110, and the output terminal of the switch unit 314 is electrically connected to the touch electrode 14 of each touch region 110, and at this time, whether the switch units 311, 312, 313, and 314 transmit the touch scan signal Vtx to the touch units 10 can be controlled by controlling the switch units 311, 312, 313, and 314 to be turned on or off. At this time, in one touch sub-phase, the switch units 311 and 312 can be controlled to be turned on simultaneously, so that the touch scan signal Vtx is transmitted to the touch units 11 of each touch area through the turned-on switch unit 311, and is transmitted to the touch units 12 of each touch area 110 through the turned-on switch unit 312, so as to implement touch scan on the two touch units 11 and 12 of the same touch area 110; in the other touch sub-stage, the switch units 313 and 314 are simultaneously controlled to be turned on, so that the touch scan signal Vtx is transmitted to the touch units 13 of each touch area through the turned-on switch unit 313, and is transmitted to the touch units 14 of each touch area 110 through the turned-on switch unit 314, thereby implementing touch scanning of the two touch units 13 and 14 of the same touch area 110.

Therefore, the switch units corresponding to the at least two touch units in the same touch area are simultaneously controlled to simultaneously provide the touch scanning signals to the at least two touch units in the same touch area through the conducted switch units, so that the touch scanning time can be shortened in multiples, namely, the touch frame time can be shortened in multiples, and further the touch stage time in the same image frame is shortened, and the display stage time is relatively increased.

In another optional embodiment of the present invention, when the touch scanning signals are simultaneously provided to the at least two touch units in the same touch area at the same touch sub-stage, the at least two switch units corresponding to the at least two touch units in the same touch area may be controlled to be sequentially turned on at the same touch sub-stage, and the touch scanning signals are simultaneously provided to the at least two switch units, so that the touch scanning signals are simultaneously provided to the at least two touch units in the same touch area through the turned-on switch units.

For example, taking the touch display device shown in fig. 8 as an example, in a touch sub-stage, the switch units 311 and 312 are sequentially controlled to be turned on, and then a touch scan signal Vtx is simultaneously provided to the input terminals of the switch units 311 and 312, so that the touch scan signal is simultaneously transmitted to the touch units 11 and 12 of each touch area through the turned-on switch units 311 and 312, so as to implement touch scanning on the two touch units 11 and 12 of the same touch area 110; in another touch sub-stage, the switch units 313 and 314 are sequentially controlled to be turned on, and then the touch scan signal Vtx is simultaneously provided to the input terminals of the switch units 313 and 314, so that the touch scan signal is simultaneously transmitted to the touch units 13 and 14 of each touch area through the turned-on switch units 313 and 314, thereby implementing touch scanning on the two touch units 13 and 14 of the same touch area 110. Therefore, the time length of the touch control stage in the same image frame can be shortened, and the time length of the display stage can be increased.

Optionally, fig. 9 is a driving timing diagram of another touch display device according to an embodiment of the present invention, and with reference to fig. 5 and fig. 9, when the touch display panel 100 includes a plurality of touch areas 110 and the same touch area 100 includes a plurality of touch units 10 arranged in sequence, the touch sub-stage TPC includes a touch scan precharge stage RplayS, a touch scan stage Slot, and a touch scan discharge stage ReplayF. Fig. 10 is a flowchart of a driving method of a touch sub-stage of a touch display panel according to an embodiment of the present invention, where as shown in fig. 10, the touch sub-stage includes:

s111, in the touch scanning pre-charging stage, the touch unit is pre-charged to a first preset voltage signal.

Exemplarily, referring to fig. 5 and fig. 9 in combination, in order to reduce cost and simplify the process, an existing structure in the touch display panel 100 is generally reused as the touch electrode of the touch unit 10, for example, a common electrode of a display unit in the touch display panel 100 is reused as the touch electrode of the touch unit 10. At this time, the touch stage and the display stage need to be performed in a time-sharing manner. In the display phase, the common electrode usually receives the common voltage signal Vcom, and in the touch phase, the touch electrode needs to perform high-low level change on the reference voltage TVCL (i.e. the first preset voltage signal) of the touch scan signal Vtx to meet the requirements of charging and discharging. Therefore, the display stage includes a plurality of display sub-stages DP, the touch stage includes a plurality of touch sub-stages TPC, and when the display sub-stages DP and the touch sub-stages TPC are overlapped, when entering one touch sub-stage TPC from one display sub-stage DP, the common voltage signal Vcom provided to the common electrode in the display sub-stage DP needs to be changed into the reference voltage TVCL of the touch scan signal Vtx, so as to ensure that the reference voltages TVCL on the touch electrodes of the touch units 10 are kept consistent before the touch scan is performed on the touch units 10, so that the touch scan signals are provided to the touch units 10 in order, and the touch detection signals fed back by the touch units 10 are received in one-to-one correspondence, so as to ensure the accuracy of touch detection when detecting the touch position of the touch object.

For example, the process of precharging the touch units to the first preset voltage signal may include charging the common voltage signals Vcom of all the common electrodes to the ground voltage Vgnd, and then changing the ground voltage Vgnd of all the common electrodes to the reference voltage TVCL of the touch scan signal Vtx, where the signal on the touch electrode of each touch unit 10 reaches the first preset voltage signal.

S112, in the touch scanning stage, sequentially providing touch scanning signals to at least two touch units in the same touch area, and receiving touch detection signals of the touch units in a one-to-one correspondence manner; the time for applying the touch scanning signals by the touch units with different arrangement serial numbers in the same touch area is not overlapped, and the time for applying the touch scanning signals by the touch units with the same arrangement serial numbers in different touch areas is overlapped.

For example, with continuing reference to fig. 5 and fig. 9, taking the example that each touch area 110 includes 4 touch units 10 and the same touch scan stage provides touch scan signals to two touch units 10 in the same touch area 110, the touch scan stage Slot of the same touch sub-stage TPC may include two touch scan sub-stages Slot1 and Slot 2. At this time, the Slot1 in the touch sub-phase MUX1 provides the touch scan signal Vtx to the touch units 11 in each touch area 110 and receives the touch detection signals fed back by the touch units 11 in each touch area 110 in a one-to-one correspondence manner, and the Slot2 in the touch sub-phase MUX1 provides the touch scan signal Vtx to the touch units 12 in each touch area 110 and receives the touch detection signals fed back by the touch units 12 in each touch area 110 in a one-to-one correspondence manner; the Slot1 provides the touch scan signal Vtx to the touch units 13 of the touch areas 110 in the touch sub-phase MUX2, and receives the touch detection signals fed back by the touch units 13 of the touch areas 110 in a one-to-one correspondence manner, and the Slot2 provides the touch scan signal Vtx to the touch units 14 of the touch areas 110 in the touch sub-phase MUX2, and receives the touch detection signals fed back by the touch units 14 of the touch areas 110 in a one-to-one correspondence manner.

S113, in the touch scan pre-discharge stage, the touch unit is discharged to a second preset voltage signal.

Specifically, with continuing reference to fig. 5 and fig. 9, during the touch phase, the touch electrode needs to perform a high-low level change on the reference voltage TVCL (i.e., the first preset voltage signal) of the touch scan signal Vtx, and during the display phase, the common electrode usually receives the common voltage signal Vcom (i.e., the second preset voltage signal). Therefore, when entering a display sub-phase DP from a touch sub-phase TPC, the reference voltage TVCL of the touch scan signal Vtx provided to the touch electrodes of the touch units 10 in the touch sub-phase TPC needs to be changed to the common voltage signal Vcom first, so as to ensure that the common voltage Vcom on the common electrodes of the display units is kept consistent, thereby improving the display uniformity of the touch display panel.

The process of discharging the touch units to the second preset voltage signal may include discharging the touch scan signal Vtx of all the common electrodes to the ground voltage Vgnd, and then changing the ground voltage Vgnd of all the common electrodes into the common voltage signal Vcom, where the signal on the touch electrode of each touch unit 10 reaches the second preset voltage signal.

For example, taking the touch scanning stage in each touch sub-stage to sequentially perform touch scanning on two touch units in the same touch area as an example, the fifth table is a touch performance verification table of another touch display panel provided in the embodiment of the present invention.

Watch five

Taking the touch display panel shown in fig. 5 as an example, it can be seen from table five that, when the touch scanning stage in each touch sub-stage sequentially performs touch scanning on two touch units in the same touch area, in the same touch display panel 100, the touch detection signals of the remote, middle and near touch units 10 all have the intensity that is kept strong, and the difference between the average value of the touch detection signals fed back by the remote touch unit 10 and the average value of the touch detection signals fed back by the near touch unit 10 is small, and the ratio of the difference to the average value of the touch detection signals fed back by the near touch unit 10 is taken as the change rate of the touch scanning signals, the change rate of the touch scanning signals of all touch display panels is less than 20%, so that when the touch scanning stage in each touch sub-stage sequentially performs touch scanning on two touch units in the same touch area, the accuracy of touch detection of the touch display panel can be ensured.

As for the prior art shown in fig. 6, a touch scanning signal is provided to one touch unit 10 in the same touch area 110 at the touch scanning stage of each touch sub-stage TPC, so that when performing touch scanning on each touch unit in the same touch area 110, a touch scanning pre-charging stage, a touch scanning pre-discharging stage and a touch scanning pre-discharging stage are required to be included, that is, when the touch area 110 includes four touch units 10, at least four touch scanning pre-charging stages, four touch scanning stages and four touch scanning pre-discharging stages are required in a touch frame, so that more touch scanning pre-charging stages and touch scanning pre-discharging stages are included. In the embodiment of the present invention, when the touch scan stage Slot of one touch sub-stage TPC sequentially provides the touch scan signals to at least two touch units 10 in the same touch area 110, for example, when the touch area 110 includes four touch units 10, and the touch scan stage Slot of one touch sub-stage TPC sequentially provides the touch scan signals to two touch units 10 in the same touch area 110, one touch frame TP may include 2 touch scan pre-charge stages, 2 touch scan stages, and 2 touch scan pre-discharge stages without considering other conditions, that is, the embodiment of the present invention reduces the number of touch scan pre-charge stages and touch scan pre-discharge stages included in each touch frame TP, thereby reducing the time required for each touch frame TP, and further shortening the time for the touch stages in the same image frame, the time of the display phase is relatively increased.

Based on the same inventive concept, an embodiment of the present invention further provides a driving device of a touch display device, where the driving device is used to drive the touch display device, and the touch display device includes a touch display panel, and the touch display panel includes a plurality of display units and a plurality of touch units. The touch display device may further include a driving circuit, and the driving device of the touch display device may be integrated in the driving circuit. Fig. 11 is a schematic structural diagram of a driving apparatus of a touch display panel according to an embodiment of the present invention, and as shown in fig. 11, the driving apparatus of the touch display panel may include a display driving module 301 and a touch driving module 302; the touch driving module 302 is configured to provide a touch scanning signal to the touch units in a touch stage of the image frame, and receive touch detection signals of the touch units in a one-to-one correspondence; the display driving module 301 is configured to perform display driving on the display unit in a display stage of the image frame; the touch control stage of the same image frame comprises M touch control frames; the touch frame comprises at least one touch sub-stage; in the same image frame, the value range of the proportion K of the total duration of the touch stage to the total duration of the display stage is as follows: k is more than or equal to 0.5M/(16.67-0.5M) and less than or equal to 5.56-M), and M is more than or equal to 1.

The driving device of the touch display device provided by the embodiment of the invention can execute the driving method of the touch display device provided by the embodiment of the invention, so that the driving device of the touch display device provided by the embodiment of the invention comprises corresponding functional modules for executing the driving method of the touch display device provided by the embodiment of the invention, and the beneficial effects of the driving method of the touch display device provided by the embodiment of the invention can be achieved. For details of the driving method of the touch display device provided by the embodiments of the present invention, reference may be made to the above description of the driving method of the touch display device.

Based on the same inventive concept, the embodiment of the invention also provides a touch display device, which comprises a touch display panel and a driving circuit; the touch display panel comprises a plurality of display units and a plurality of touch units; the driving circuit is used for driving the touch display panel and executing the driving method of the touch display panel provided by the embodiment of the invention.

The touch display device provided by the embodiment of the invention can include, but is not limited to, a mobile phone, a notebook computer, a wearable device (such as a watch, a bracelet, and the like), a display of other non-portable devices, and the like.

The driving circuit in the touch display device provided by the embodiment of the present invention can execute the driving method of the touch display device provided by the embodiment of the present invention, and therefore, the driving circuit in the touch display device provided by the embodiment of the present invention includes corresponding functional modules for executing the driving method of the touch display device provided by the embodiment of the present invention, and can achieve the beneficial effects of the driving method of the touch display device provided by the embodiment of the present invention. For technical details that are not described in detail in the above embodiments, reference may be made to the above description of the driving method of the touch display device provided in the embodiments of the present invention.

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 without departing from the scope of the invention. Therefore, although the present invention has been described in more 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

1. A driving method of a touch display device is used for driving the touch display device, and is characterized in that the touch display device comprises a touch display panel, and the touch display panel comprises a plurality of display units and a plurality of touch units; the driving method of the touch display panel comprises a plurality of image frames; the same image frame comprises a touch control stage and a display stage;

in the display stage, performing display driving on the display unit;

2. The driving method of the touch display device according to claim 1, wherein in the same image frame, a total duration Tp of the touch phase has a value range of: tp is more than or equal to 0.5M and less than or equal to M.

3. The driving method of the touch display device according to claim 1, wherein in the same touch frame, the touch scan signal provided to the touch unit includes Q pulses; wherein Q is more than or equal to 6 and less than or equal to 15.

4. The driving method of the touch display device according to claim 1, wherein the touch display panel includes a plurality of touch areas; the same touch area comprises a plurality of touch units which are arranged in sequence;

in the same touch sub-stage, the touch scanning signals are simultaneously provided for at least two touch units in the same touch area, and touch detection signals of the touch units are received in a one-to-one correspondence manner; and the time for applying the touch scanning signals by the touch units with the same arrangement sequence number in different touch areas is overlapped.

5. The driving method of the touch display device according to claim 4, wherein the touch phase comprises N touch sub-phases; n is a positive integer less than 9;

and applying the touch scanning signals to the touch units with different arrangement serial numbers in the same touch area at different touch sub-stages of the same touch frame.

6. The driving method of the touch display device according to claim 4, wherein the touch display device further comprises a driving circuit; the driving circuit comprises a plurality of switch units which are in one-to-one correspondence with the touch units in the same touch area; the input end of the switch unit receives a touch scanning signal, and the output end of the switch unit is electrically connected with the touch unit;

at the same touch sub-stage, controlling at least two switch units corresponding to at least two touch units in the same touch area to be simultaneously conducted, so that the touch scanning signal is simultaneously provided to the at least two touch units in the same touch area through the conducted switch units;

or, in the same touch sub-stage, controlling at least two switch units corresponding to at least two touch units in the same touch area to be sequentially switched on, and simultaneously providing the touch scanning signals to the at least two switch units, so that the touch scanning signals are simultaneously provided to the at least two touch units in the same touch area through the switched-on switch units.

7. The driving method of the touch display device according to claim 1, wherein the touch display panel includes a plurality of touch areas; the same touch area comprises a plurality of touch units which are arranged in sequence; the touch sub-stage comprises a touch scanning pre-charging stage, a touch scanning stage and a touch scanning discharging stage;

in the touch scanning pre-charging stage, pre-charging the touch unit to a first preset voltage signal;

in the touch scanning stage, sequentially providing the touch scanning signals to at least two touch units in the same touch area, and receiving touch detection signals of the touch units in a one-to-one correspondence manner; the time for applying the touch scanning signals by the touch units with different arrangement serial numbers in the same touch area is not overlapped, and the time for applying the touch scanning signals by the touch units with the same arrangement serial numbers in different touch areas is overlapped;

and discharging the touch unit to a second preset voltage signal in the touch scanning pre-discharge stage.

8. The driving method of the touch display device according to any one of claims 1 to 7, wherein the touch display panel includes a plurality of sub-display regions, and the same sub-display region includes a plurality of the display units; the display phase comprises at least one display sub-phase; in the same image frame, the touch sub-stage and the display sub-stage are alternately performed;

in the display sub-stage, performing display driving on the display units in the same sub-display area;

and in the same image frame, different display sub-stages carry out display driving on the display units of different sub-display areas.

9. The driving method of the touch display device according to any one of claims 1 to 7, wherein the touch frame further includes a noise detection stage;

and in the noise detection stage, performing noise detection on the touch display panel to obtain a noise detection signal.

10. A driving device of a touch display device is used for driving the touch display device, and is characterized in that the touch display device comprises a touch display panel, and the touch display panel comprises a plurality of display units and a plurality of touch units; the driving device of the touch display panel comprises a display driving module and a touch driving module;

the display driving module is used for performing display driving on the display unit in the display stage of the image frame;

11. A touch display device, comprising: the display device comprises a touch display panel and a driving circuit;

the driving circuit is configured to drive the touch display panel and perform the driving method of the touch display device according to any one of claims 1 to 9.