Display panel driving method, display module and display device

Abstract

The present disclosure provides a display panel driving method, a display module and a display device, which belongs to the field of display technology. The display panel driving method disclosed in the present disclosure includes: in the touch control stage, a touch signal is input to the touch control electrode through a touch signal line; the touch control stage includes: a first touch control stage and a second touch control stage; the touch signal includes: an uplink signal and a touch control drive signal; in the first touch control stage, an uplink signal is input to the touch control electrode through the touch signal line; in the second touch control stage, a touch control drive signal is input to the touch control electrode through the touch signal line; wherein the effective level of the uplink signal is greater than the effective level of the touch control drive signal.

Description

Technical Field

[0001] The present disclosure belongs to the field of display technology, and particularly relates to a display panel driving method, a display module and a display device. Background Art

[0002] At present, the display panel has a display function and an integrated touch function, wherein the touch electrodes can be reused as common electrodes. In the display stage, common signals can be input to the common electrodes, and in the touch stage, touch signals can be input to the touch electrodes. When a stylus pen is needed to operate on the display panel, an uplink signal needs to be input to the touch electrode in the touch stage, so that when the stylus pen is close to or in contact with the display panel, the stylus pen can detect the uplink signal in the display panel, thereby enabling the stylus pen to send a signal to the display panel according to the protocol requirements.

[0003] In order to avoid the influence of stray capacitance between the touch electrodes and the gate lines and data lines in the display panel, the effective level of the uplink signal input to the touch electrodes is often increased during the touch stage to improve the signal-to-noise ratio of the uplink signal, so that the effective level of the touch drive signal is also increased, which easily increases the energy consumption of the display panel. In addition, the use of too high an effective level of the touch drive signal will also have a negative impact on the increase in the refresh frequency, thereby failing to increase the refresh frequency of the display panel. Summary of the invention

[0004] The present disclosure aims to solve at least one of the technical problems existing in the prior art, and provides a display panel driving method, a display module and a display device.

[0005] In a first aspect, an embodiment of the present disclosure provides a method for driving a display panel, the display panel comprising: a plurality of touch electrodes and a plurality of touch signal lines connected to the touch electrodes; the method for driving the display panel comprising: in a touch control stage, inputting a touch signal to the touch electrodes through the touch signal lines; the touch control stage comprising: a first touch control stage and a second touch control stage; the touch signal comprising: an uplink signal and a touch drive signal;

[0006] In the first touch stage, an uplink signal is input to the touch electrode through the touch signal line; in the second touch stage, the touch drive signal is input to the touch electrode through the touch signal line; wherein the effective level of the uplink signal is greater than the effective level of the touch drive signal.

[0007] Optionally, in the first touch control stage, an uplink signal is input to the touch control electrode through the touch control signal line, which includes:

[0008] According to the protocol requirements, the number of pulses of the touch synchronization signal within one frame display time is set to N; N is an integer greater than 1;

[0009] When the touch synchronization signal and the vertical synchronization signal are both at valid levels, starting to count the number of pulses of the touch synchronization signal;

[0010] When the number of pulses of the touch synchronization signal is N+1, this moment is determined as the starting moment of the first touch control stage;

[0011] When the number of pulses of the touch synchronization signal is N+M, the moment is determined as the end moment of the first touch control stage and the start moment of the second touch control stage; M is an integer greater than or equal to 1 and less than N;

[0012] When the number of pulses of the touch synchronization signal is 2N, this moment is determined as the termination moment of the second touch control stage.

[0013] Optionally, in the first touch control stage, an uplink signal is input to the touch control electrode through the touch control signal line, and the method further includes:

[0014] According to the protocol requirements, a modulation signal having a first level and a second level is generated; the first level is maintained for the same time as the first touch control stage; the second level is maintained for the same time as the second touch control stage;

[0015] generating the uplink signal according to the modulation signal of the first level and using a first power supply voltage signal;

[0016] The touch driving signal is generated according to the modulation signal of the second level and using a second power supply voltage signal.

[0017] Optionally, in the display stage, the touch electrodes are multiplexed as common electrodes; the touch signal lines are multiplexed as common signal lines; the display panel also includes: a plurality of pixel electrodes, and a plurality of data signal lines connected to the pixel electrodes; the driving method of the display panel also includes: in the display stage, a common signal is input to the common electrode through the common signal line, and a data signal is input to the pixel electrode through the data signal line.

[0018] In a second aspect, an embodiment of the present disclosure provides a display module, comprising: a display panel and a driving circuit; the display panel comprises: a plurality of touch electrodes and a plurality of touch signal lines connected to the touch electrodes; the driving circuit is configured to input a touch signal to the touch electrodes through the touch signal lines during a touch stage; the touch stage comprises: a first touch stage and a second touch stage; the touch signal comprises: an uplink signal and a touch driving signal;

[0019] In the first touch stage, an uplink signal is input to the touch electrode through the touch signal line; in the second touch stage, the touch drive signal is input to the touch electrode through the touch signal line; wherein the effective level of the uplink signal is greater than the effective level of the touch drive signal.

[0020] Optionally, the driving circuit includes: a modulation subcircuit, a first selection subcircuit and a second selection subcircuit;

[0021] The modulation subcircuit is configured to generate a modulation signal having a first level and a second level according to protocol requirements; the first level is maintained for the same time as the first touch control stage; the second level is maintained for the same time as the second touch control stage;

[0022] The first selection subcircuit is configured to generate the uplink signal using a first power supply voltage signal according to the modulation signal of the first level;

[0023] The second selection sub-circuit is configured to generate the touch driving signal according to the modulation signal of the second level and using a second power supply voltage signal.

[0024] Optionally, the modulation subcircuit includes: a gate circuit and a counter;

[0025] The first input terminal of the gate circuit is connected to the touch synchronization signal terminal, the second input terminal is connected to the vertical synchronization signal terminal, and the output terminal is connected to the first input terminal of the counter;

[0026] The first input terminal of the counter is connected to the output terminal of the gate circuit, the second input terminal is connected to the touch synchronization signal terminal, the third input terminal is connected to the counting signal terminal, and the output terminal is connected to the first selection subcircuit and the second selection subcircuit.

[0027] Optionally, the first selection subcircuit includes: a first diode, a first transistor, a second transistor, a third transistor, a fourth transistor and a fifth transistor;

[0028] A first electrode of the first diode is connected to the modulation subcircuit and the control electrode of the fourth transistor, and a second electrode is connected to the control electrode of the third transistor;

[0029] The control electrode of the first transistor is connected to a first node, the first electrode is connected to a first power supply voltage terminal, and the second electrode is connected to a second node; the first node is a connection point of the control electrode of the first transistor, the second electrode of the second transistor, the first electrode of the fourth transistor, and the control electrode of the fifth transistor; the second node is a connection point of the control electrode of the second transistor, the second electrode of the first transistor, and the first electrode of the third transistor;

[0030] The control electrode of the second transistor is connected to the second node, the first electrode is connected to the first power supply voltage terminal, and the second electrode is connected to the first node;

[0031] The control electrode of the third transistor is connected to the second electrode of the first diode, the first electrode is connected to the second node, and the second electrode is connected to the third power supply voltage terminal;

[0032] The control electrode of the fourth transistor is connected to the first electrode of the first diode, the first electrode is connected to the first node, and the second electrode is connected to the third power supply voltage terminal;

[0033] The control electrode of the fifth transistor is connected to the first node, the first electrode is connected to the first power supply voltage terminal, and the second electrode is connected to the touch signal line.

[0034] Optionally, the second selection subcircuit includes: a second diode, a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor and a tenth transistor;

[0035] A first electrode of the second diode is connected to the modulation subcircuit and the control electrode of the eighth transistor, and a second electrode is connected to the control electrode of the ninth transistor;

[0036] The control electrode of the sixth transistor is connected to the third node, the first electrode is connected to the second power supply voltage terminal, and the second electrode is connected to the fourth node; the third node is the connection point of the control electrode of the sixth transistor, the second electrode of the seventh transistor, the first electrode of the ninth transistor and the control electrode of the tenth transistor; the fourth node is the connection point of the control electrode of the seventh transistor, the second electrode of the sixth transistor and the first electrode of the eighth transistor;

[0037] The control electrode of the seventh transistor is connected to the fourth node, the first electrode is connected to the second power supply voltage terminal, and the second electrode is connected to the third node;

[0038] The control electrode of the eighth transistor is connected to the first electrode of the second diode and the modulation subcircuit, the first electrode is connected to the fourth node, and the second electrode is connected to the third power supply voltage terminal;

[0039] The control electrode of the ninth transistor is connected to the second electrode of the second diode, the first electrode is connected to the third node, and the second electrode is connected to the third power supply voltage terminal;

[0040] The control electrode of the tenth transistor is connected to the third node, the first electrode is connected to the second power supply voltage terminal, and the second electrode is connected to the touch signal line.

[0041] In a third aspect, an embodiment of the present disclosure provides a display device, comprising the display module provided as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a schematic structural diagram of an exemplary display panel;

[0043] Figure 2 is a schematic diagram of the structure of an exemplary touch panel;

[0044] Figure 3 is an exemplary driving timing diagram of a display panel;

[0045] Figure 4 is a schematic diagram of an exemplary in-cell display module circuit structure;

[0046] Figure 5 is a schematic diagram of an exemplary improved in-cell display module circuit structure;

[0047] Figure 6 A driving timing diagram of a display panel provided in an embodiment of the present disclosure;

[0048] Figure 7 A schematic diagram of the structure of a driving circuit provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the technical solution of the present disclosure, the present disclosure is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0050] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0051] Figure 1 is a schematic diagram of an exemplary structure of a display panel, such as Figure 1 As shown, the display panel includes: a plurality of gate lines 101 and a plurality of data lines 102, and a plurality of sub-pixels 103 defined by the plurality of gate lines 101 and the plurality of data lines 102. In the display stage, a scanning signal can be input to each sub-pixel 103 through the gate line 101, so that the sub-pixel 103 is turned on row by row, and a data signal is input to each sub-pixel 103 through the data line 102, so as to realize the display function of the display panel. The display panel can be a display panel of various types, such as a liquid crystal display panel, an organic light emitting display panel or a plasma light emitting display panel, and the arrangement of the gate lines 101, the data lines 102 and the sub-pixels 103 can be set according to different types of display panels. Figure 2 is a schematic diagram of an exemplary structure of a touch panel, such as Figure 2 As shown, the touch panel includes: a plurality of touch electrodes 201, and a plurality of touch signal lines 202 connected to the touch electrodes 201. In the touch stage, a touch signal can be input to each touch electrode 201 through the touch signal line 202 to realize the touch function of the touch panel. In practical applications, the touch panel in the display module can be set outside the display panel and adopt an on-cell type, or the touch panel can be embedded in the display panel and adopt an in-cell type.

[0052] In the on-cell display module, since the touch function and the display function are performed synchronously on the time axis, the timing is relatively simple, and the frame start signal STV can be used to synchronize a frame of data signals. In addition, since the touch panel is outside the display panel, the touch electrode 201 in the touch panel itself is not easy to form stray capacitance with the gate line 101 and the data line 102 in the display panel. In the in-cell display module, the timing diagram is as follows: Figure 3 As shown, according to the protocol requirements, the touch synchronization signal Tsync needs to be used to control and synchronize the display function and the touch function. For example, when the touch synchronization signal Tsync is at a high level, the display is performed, and when the touch synchronization signal Tsync is at a low level, the touch is performed. At the beginning of each frame of the display screen, it is necessary to transmit the uplink signal at the first low-level pulse of the touch synchronization signal Tsync and the 7th / 8th position, that is, to set the driving frequency of the stylus, the state of the stylus, the protocol of the stylus, etc., so that the subsequent synchronization can be performed according to the set actions. If there is a problem with the uplink signal transmission, it is easy to cause the stylus to malfunction, and the touch function cannot be realized through the stylus.

[0053] In the in-cell display module, the touch electrode 201 can be time-shared with the common electrode. Since the touch electrode 201 is arranged inside the display panel, the gate line 101 and the data line 102 in the display panel are prone to form stray capacitance with the touch electrode 201, affecting the signal-to-noise ratio of the touch signal. Figure 4 is a schematic diagram of an exemplary in-cell display module circuit structure, such as Figure 4 As shown, when the stylus is in contact with the display panel, the stray capacitance between the touch electrode and the gate line and the data line is affected as follows: ΔQx = ΔU*Cx, where ΔQx is the charge between the touch electrode and the gate line and the data line, ΔU is the charging voltage of the touch electrode, and Cx is the capacitance between the touch electrode and the gate line and the data line. The capacitance between the touch electrode and the stylus is affected as follows: ΔQt = ΔU*Ct, where ΔQt is the charge between the touch electrode and the stylus, ΔU is the charging voltage of the touch electrode, and Ct is the capacitance between the stylus and the touch electrode. According to the requirements of the touch function, the larger the ratio of Ct to Cx, the better the touch performance. For the current process conditions, Cx cannot be further reduced. Ct is affected by human conditions and cannot be artificially increased. The sensitivity of the stylus is: a = ΔQt / ΔQx = ΔU*Ct / ΔU*Cx = Ct / Cx, and its touch sensitivity is limited.

[0054] Figure 5 is a schematic diagram of an exemplary improved in-cell display module circuit structure, such as Figure 5As shown, in the touch stage, a signal with the same waveform as the touch signal is applied to the gate line 101 and the data line 102, so that the voltage difference between the touch electrode 201 and the gate line 101 and the data line 102 can be reduced, thereby offsetting the influence of stray capacitance on the touch performance. Specifically, the stray capacitance between the touch electrode and the gate line and the data line is affected as follows: ΔQx = (ΔU-VCOMP) * Cx. The capacitance between the touch electrode and the stylus is affected as follows: ΔQt = ΔU * Ct. The sensitivity of the stylus: b = ΔQt / ΔQx = ΔU * Ct / (ΔU-VCOMP) * Cx = (Ct / Cx) * (ΔU / (ΔU-VCOMP)). Since Ct / Cx is limited by human factors and the process, under the premise of the optimal ΔU, for the same display panel, when Ct and Cx are the same, the effective charge involved in the touch response increases, and the trend is as follows: α=b / a=(Ct / Cx)*(ΔU / (ΔU-VCOMP)) / Ct / Cx=ΔU / (ΔU-VCOMP). The sensitivity of the stylus is positively correlated with the value of α, so the effective charge can be increased by adjusting VCOMP, thereby improving the sensitivity of the stylus.

[0055] It can be seen that the influence of stray capacitance on the sensitivity of the stylus can be reduced by applying a signal with the same waveform as the touch signal on the gate line 101 and the data line 102, thereby improving the sensitivity of the stylus to a certain extent, thereby ensuring the stylus's ability to receive the uplink signal, so as to ensure the normal subsequent touch. However, due to the structural limitations of the stylus, the pen tip cannot be infinitely enlarged. When the signal volume of the uplink signal still cannot guarantee the stable signal transmission of the stylus, the usual practice is to increase the signal volume by increasing the effective level of the uplink signal, that is, the peak-to-peak value Vp-p of the uplink signal, so as to ensure that the stylus can receive a relatively higher signal, so as to ensure the accuracy of information transmission. However, due to the increase in the peak-to-peak value Vp-p of the uplink signal in this process, although it will bring about the accuracy of signal transmission, when the finger is touching, the touch electrode will also work synchronously using the peak-to-peak value Vp-p of the uplink signal. In this way, during the finger operation, an excessively high effective level will greatly increase power consumption, and due to the excessively high voltage and the use of an excessively high effective level by the touch drive signal, it will also have a negative impact on the increase in refresh frequency, thereby failing to increase the refresh frequency of the display panel.

[0056] In order to solve at least one of the above technical problems, the present disclosure provides a display panel driving method, a display module and a display device. The display panel driving method, the display module and the display device provided in the embodiments of the present disclosure are further described in detail below in combination with the accompanying drawings and specific implementation methods.

[0057] An embodiment of the present disclosure provides a method for driving a display panel, which comprises: in a touch stage, inputting a touch signal to a touch electrode through a touch signal line; the touch stage comprises: a first touch stage and a second touch stage; the touch signal comprises: an uplink signal and a touch drive signal; in the first touch stage, inputting an uplink signal to the touch electrode through the touch signal line; in the second touch stage, inputting a touch drive signal to the touch electrode through the touch signal line; wherein an effective level of the uplink signal is greater than an effective level of the touch drive signal.

[0058] It should be noted that Figure 6 A driving timing diagram of a display panel provided in an embodiment of the present disclosure will be described below in conjunction with Figure 6 The driving method of the display panel provided by the embodiment of the present disclosure is described in detail. Figure 6 As shown, the frame start signal STV is used as a trigger signal for displaying each frame of the screen, and the touch synchronization signal Tsync is used as a distinguishing signal between the display stage and the touch stage, wherein the high level stage of the touch synchronization signal Tsync is the display stage, the low level stage is the touch stage, and the vertical synchronization signal Vsync is used as a reference touch synchronization signal Tsync signal generation signal. According to the protocol requirements, there are a fixed number of touch synchronization signals Tsync between every two frame start signals STV. For example, in the MPP2.5 protocol, there are 16 touch synchronization signals Tsync between every two frame start signals STV, and the touch signal transmits an uplink signal once every 16 pulses. In the embodiment of the present disclosure, the frame start signal STV and the touch synchronization signal Tsync are used as time references, and according to the protocol requirements, the uplink signal and the touch drive signal are input to each touch electrode through the touch signal line. When the touch synchronization signal Tsync is at a low level, in the first touch stage, an uplink signal is input to the touch electrode through the touch signal line Tx (202), wherein the number of pulses of the uplink signal may be 4. In the second touch stage, a touch drive signal is input to the touch electrode through the touch signal line Tx (202), wherein the number of pulses of the touch drive signal may be 12, thereby completing one touch cycle.

[0059] In the driving method of the display panel provided in the embodiment of the present disclosure, in the first touch stage, when the stylus is close to or in contact with the display panel, the stylus can detect the uplink signal input on the touch electrode of the display panel, so that it can be synchronized according to the set action later, ensuring that the touch function can be realized by the stylus. In the second touch stage, when the finger is in contact with the display panel, the finger touch function can be realized by identifying the change of the touch drive signal on the touch electrode caused by the finger touch. Since in the embodiment of the present disclosure, the uplink signal and the touch drive signal are independently controlled, and the effective level of the uplink signal is greater than the effective level of the touch drive signal, when the stylus is close to or in contact with the display panel, the signal-to-noise ratio can be improved by increasing the effective level of the uplink signal, thereby ensuring that the stylus can receive a relatively higher signal, so as to ensure the accuracy of information transmission. Furthermore, when the finger contacts the display panel, the touch drive signal on the touch electrode has a smaller effective level than the uplink signal. Thus, when the finger touches the display, it can save energy while achieving a good touch effect, thereby improving product competitiveness. It can also avoid the negative impact of excessive effective levels on the refresh frequency, thereby increasing the refresh frequency of the display panel and improving the display effect.

[0060] In some embodiments, in the first touch stage, an uplink signal is input to the touch electrode through the touch signal line, which includes: according to the protocol requirements, the number of pulses of the touch synchronization signal in one frame display time is set to N; N is an integer greater than 1; when the touch synchronization signal and the vertical synchronization signal are both at valid levels, the number of pulses of the touch synchronization signal begins to be counted; when the number of pulses of the touch synchronization signal is N+1, this moment is determined as the starting moment of the first touch stage; when the number of pulses of the touch synchronization signal is N+M, this moment is determined as the end moment of the first touch stage and the start moment of the second touch stage; M is an integer greater than or equal to 1 and less than N; when the number of pulses of the touch synchronization signal is 2N, this moment is determined as the end moment of the second touch stage.

[0061] It should be noted that the number of pulses of the touch synchronization signal within one frame display time can be set to different values ​​according to different protocols. For example, in the MPP2.5 protocol, the number of pulses of the touch synchronization signal Tsync within one frame display time can be set to 16. Because the touch synchronization signal Tsync will be powered on in advance, but the effective touch synchronization signal Tsync starts from the effective frame start signal STV, it is necessary to define the start time of the effective count of the touch synchronization signal Tsync through the relationship between the vertical synchronization signal Vsync and the touch synchronization signal Tsync during the power-on phase. After the effective count starts, according to the requirements of the protocol, if the number of pulses per frame is 16, the counter counts the falling edges of the touch synchronization signal Tsync 16+1 times. When the number of pulses of the touch synchronization signal Tsync is 16+1, it is set as the start time of the first touch control stage. When the number of pulses of the touch synchronization signal Tsync is 16+M, it is set as the end time of the first touch control stage and the start time of the second touch control stage, where the number of M is generally 1 or 2 pulses. When the number of pulses of the touch synchronization signal Tsync is 32, it is set as the end time of the second touch control stage. In this way, the duration of the first touch control stage and the second touch control stage can be set, and the uplink signal and the touch drive signal can be independently controlled by modulating the signal, and the switching of the uplink signal and the touch drive signal can be realized, so that the signal can be improved by increasing the effective level of the uplink signal to ensure the accuracy of information transmission, and the power consumption can be reduced by reducing the effective level of the touch drive signal, thereby improving the competitiveness of the product.

[0062] In some embodiments, in the first touch stage, an uplink signal is input to the touch electrode through the touch signal line, and the process also includes: generating a modulation signal having a first level and a second level according to protocol requirements; maintaining the first level for the same time as the first touch stage; maintaining the second level for the same time as the second touch stage; generating an uplink signal based on the modulation signal of the first level using a first power supply voltage signal; and generating a touch drive signal based on the modulation signal of the second level using a second power supply voltage signal.

[0063] It should be noted that, according to the start time and end time of the first touch stage and the second touch stage determined above, and according to the protocol requirements, a modulation signal having a first level and a second level can be generated, wherein the first level can be a high level, and the second level can be a low level, wherein the maintenance time of the high level is the same as the time of the first touch stage, and the maintenance time of the low level is the same as the time of the second touch stage. Under the control of the modulation signal, the first power supply voltage signal can be output to generate an uplink signal, or the second power supply voltage signal can be output to generate a touch drive signal. In this way, the uplink signal and the touch drive signal can be independently controlled and switched through the modulation signal, so that the signal can be improved by increasing the effective level of the uplink signal to ensure the accuracy of information transmission, and the power consumption can be reduced by reducing the effective level of the touch drive signal, thereby improving the competitiveness of the product.

[0064] In some embodiments, during the display stage, the touch electrodes are multiplexed as common electrodes; the touch signal lines are multiplexed as common signal lines; the display panel also includes: a plurality of pixel electrodes, and a plurality of data signal lines connected to the pixel electrodes; the driving method of the display panel also includes: during the display stage, a common signal is input to the common electrode through the common signal line, and a data signal is input to the pixel electrode through the data signal line.

[0065] It should be noted that when the touch synchronization signal Tsync is at a high level, the display panel can display, the start time of the display stage is the end time of the second touch stage of two adjacent touch stages, and the end time of the display stage is the start time of the first touch stage of two adjacent touch stages. Taking the liquid crystal display panel as an example, in the display stage, a data signal can be input to the pixel electrode, and a common signal can be input to the common electrode at the same time, so that an electric field is formed between the pixel electrode and the common electrode, driving the liquid crystal molecules between the two to deflect, thereby realizing the display function.

[0066] The disclosed embodiment also provides a display module, comprising: a display panel and a driving circuit; the display panel comprises: a plurality of touch electrodes, and a plurality of touch signal lines connected to the touch electrodes; the driving circuit is configured to input touch signals to the touch electrodes through the touch signal lines in a touch stage; the touch stages comprise: a first touch stage and a second touch stage; the touch signals comprise: an uplink signal and a touch drive signal; in the first touch stage, the uplink signal is input to the touch electrodes through the touch signal lines; in the second touch stage, the touch drive signal is input to the touch electrodes through the touch signal lines; wherein the effective level of the uplink signal is greater than the effective level of the touch drive signal.

[0067] It should be noted that the driving circuit can provide the display panel with an uplink signal and a touch drive signal. In the first touch stage, when the stylus is close to or in contact with the display panel, the stylus can detect the uplink signal input on the touch electrode of the display panel, so that it can be synchronized according to the set action later, ensuring that the touch function can be realized by the stylus. In the second touch stage, when the finger is in contact with the display panel, the finger touch function can be realized by identifying the change of the touch drive signal on the touch electrode caused by the finger touch. Since in the embodiment of the present disclosure, the uplink signal and the touch drive signal are independently controlled, and the effective level of the uplink signal is greater than the effective level of the touch drive signal, when the stylus is close to or in contact with the display panel, the effective level of the uplink signal can be increased to improve its signal-to-noise ratio, thereby ensuring that the stylus can receive a relatively higher signal, so as to ensure the accuracy of information transmission. Furthermore, when the finger contacts the display panel, the touch drive signal on the touch electrode has a smaller effective level than the uplink signal. Thus, when the finger touches the display, it can save energy while achieving a good touch effect, thereby improving product competitiveness. It can also avoid the negative impact of excessive effective levels on the refresh frequency, thereby increasing the refresh frequency of the display panel and improving the display effect.

[0068] In some embodiments, Figure 7 A schematic diagram of a driving circuit provided in an embodiment of the present disclosure is shown in FIG. Figure 7 As shown, the driving circuit includes: a modulation subcircuit 701, a first selection subcircuit 702 and a second selection subcircuit 703; the modulation subcircuit 701 is configured to generate a modulation signal with a first level and a second level according to the protocol requirements; the maintenance time of the first level is the same as the time of the first touch stage; the maintenance time of the second level is the same as the time of the second touch stage; the first selection subcircuit 702 is configured to generate an uplink signal according to the modulation signal of the first level using the first power supply voltage signal; the second selection subcircuit 703 is configured to generate a touch drive signal according to the modulation signal of the second level using the second power supply voltage signal.

[0069] Specifically, the modulation subcircuit 701 includes: a gate circuit 7011 and a counter 7012; the first input terminal of the gate circuit 7011 is connected to the touch synchronization signal terminal Tsync, the second input terminal is connected to the vertical synchronization signal terminal Vsync, and the output terminal is connected to the first input terminal of the counter 7012; the first input terminal of the counter 7012 is connected to the output terminal of the gate circuit 7011, the second input terminal is connected to the touch synchronization signal terminal Tsync, the third input terminal is connected to the counting signal terminal 1, and the output terminal is connected to the first selection subcircuit 702 and the second selection subcircuit 703. The first selection subcircuit 702 includes: a first diode D1, a first transistor M1, a second transistor M2, a third transistor M3, a fourth transistor M4 and a fifth transistor M5; the first electrode of the first diode D1 is connected to the modulation subcircuit 701 and the control electrode of the fourth transistor M4, and the second electrode is connected to the control electrode of the third transistor M3; the control electrode of the first transistor M1 is connected to the first node N1, the first electrode is connected to the first power supply voltage terminal V1, and the second electrode is connected to the second node N2; the first node N1 is a connection point of the control electrode of the first transistor M1, the second electrode of the second transistor M2, the first electrode of the fourth transistor M4 and the control electrode of the fifth transistor M5; the second node N2 is a connection point of the control electrode of the second transistor M 2, the second electrode of the first transistor M1 and the first electrode of the third transistor M3; the control electrode of the second transistor M2 is connected to the second node N2, the first electrode is connected to the first power supply voltage terminal V1, and the second electrode is connected to the first node N2; the control electrode of the third transistor M3 is connected to the second electrode of the first diode D2, the first electrode is connected to the second node N2, and the second electrode is connected to the third power supply voltage terminal V3; the control electrode of the fourth transistor M4 is connected to the first electrode of the first diode D1, the first electrode is connected to the first node N1, and the second electrode is connected to the third power supply voltage terminal V3; the control electrode of the fifth transistor M5 is connected to the first node N1, the first electrode is connected to the first power supply voltage terminal V1, and the second electrode is connected to the touch signal line.The second selection subcircuit 703 includes: a second diode D2, a sixth transistor M6, a seventh transistor M7, an eighth transistor M8, a ninth transistor M9 and a tenth transistor M10; the first electrode of the second diode D2 is connected to the modulation subcircuit 701 and the control electrode of the eighth transistor M8, and the second electrode is connected to the control electrode of the ninth transistor M9; the control electrode of the sixth transistor M6 is connected to the third node N3, the first electrode is connected to the second power supply voltage terminal V2, and the second electrode is connected to the fourth node N4; the third node N3 is the connection point of the control electrode of the sixth transistor M6, the second electrode of the seventh transistor M7, the first electrode of the ninth transistor M9 and the control electrode of the tenth transistor M10; the fourth node N4 is the control electrode of the seventh transistor M7. The control electrode of the seventh transistor M7 is connected to the fourth node N4, the first electrode is connected to the second power supply voltage terminal V2, and the second electrode is connected to the third node N3; the control electrode of the eighth transistor M8 is connected to the first electrode of the second diode D2 and the modulation sub-circuit 701, the first electrode is connected to the fourth node N4, and the second electrode is connected to the third power supply voltage terminal V3; the control electrode of the ninth transistor M9 is connected to the second electrode of the second diode D2, the first electrode is connected to the third node N3, and the second electrode is connected to the third power supply voltage terminal V3; the control electrode of the tenth transistor M10 is connected to the third node N3, the first electrode is connected to the second power supply voltage terminal V2, and the second electrode is connected to the touch signal line.

[0070] It should be noted that, in the embodiment of the present disclosure, the first transistor M1, the second transistor M2, the fifth transistor M5, the sixth transistor M6, the seventh transistor M7 and the tenth transistor M10 can all be P-type transistors, and the third transistor M3, the fourth transistor M4, the eighth transistor M8 and the ninth transistor M9 can all be N-type transistors. The voltage of the first power supply voltage terminal V1 is higher than the voltage of the second power supply voltage terminal V2, and the voltage of the second power supply voltage terminal V2 is higher than the voltage of the third power supply voltage terminal V3. When the modulation signal is at the first level, that is, at a high level, the eighth transistor M8 is turned on and the ninth transistor M9 is turned off, so that the potential of the fourth node N4 is pulled to 0V, thereby turning on the seventh transistor M7 and turning off the sixth transistor M6, so that the potential of the third node N3 is the potential of the second power supply voltage terminal V2, causing the tenth transistor M10 to be turned off. At the same time, the fourth transistor M4 is turned on and the third transistor M3 is turned off, so that the potential of the first node N1 is pulled to 0V, thereby turning on the first transistor M1 and turning off the second transistor M2, so that the potential of the second node N2 is pulled to 0V, causing the sixth transistor M6 to turn on, thereby outputting the first power supply voltage signal to generate an uplink signal. Similarly, when the modulation signal is at the second level, that is, at a low level, its implementation principle is similar to the above, and will not be repeated here. The second power supply voltage signal can be output by controlling the state of each transistor to generate a touch drive signal.

[0071] The embodiment of the present disclosure also provides a display device, which includes a display module as provided in any of the above embodiments. The display device can be a terminal device such as a mobile phone, a laptop computer, a tablet computer, a smart TV, etc., and its implementation principle is similar to that of the above display module, which will not be repeated here.

[0072] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A display module, comprising: Display panel and driving circuit; The display panel comprises: a plurality of touch electrodes and a plurality of touch signal lines connected to the touch electrodes; the driving circuit is configured to input a touch signal to the touch electrodes through the touch signal lines during a touch stage; the touch stage comprises: a first touch stage and a second touch stage; the touch signal comprises: an uplink signal and a touch driving signal; In the first touch control stage, an uplink signal is input to the touch control electrode through the touch signal line; in the second touch control stage, the touch control drive signal is input to the touch control electrode through the touch signal line; wherein the effective level of the uplink signal is greater than the effective level of the touch control drive signal; The driving circuit comprises: a modulation subcircuit, a first selection subcircuit and a second selection subcircuit; The modulation subcircuit is configured to generate a modulation signal having a first level and a second level according to protocol requirements; the first level is maintained for the same time as the first touch control stage; the second level is maintained for the same time as the second touch control stage; The first selection subcircuit is configured to generate the uplink signal using a first power supply voltage signal according to the modulation signal of the first level; The second selection sub-circuit is configured to generate the touch driving signal according to the modulation signal of the second level and using a second power supply voltage signal; The modulation subcircuit includes: a gate circuit and a counter; The first input terminal of the gate circuit is connected to the touch synchronization signal terminal, the second input terminal is connected to the vertical synchronization signal terminal, and the output terminal is connected to the first input terminal of the counter; The first input terminal of the counter is connected to the output terminal of the gate circuit, the second input terminal is connected to the touch synchronization signal terminal, the third input terminal is connected to the counting signal terminal, and the output terminal is connected to the first selection sub-circuit and the second selection sub-circuit; The first selection subcircuit includes: a first diode, a first transistor, a second transistor, a third transistor, a fourth transistor and a fifth transistor; A first electrode of the first diode is connected to the modulation subcircuit and the control electrode of the fourth transistor, and a second electrode is connected to the control electrode of the third transistor; The control electrode of the first transistor is connected to a first node, the first electrode is connected to a first power supply voltage terminal, and the second electrode is connected to a second node; the first node is a connection point of the control electrode of the first transistor, the second electrode of the second transistor, the first electrode of the fourth transistor, and the control electrode of the fifth transistor; the second node is a connection point of the control electrode of the second transistor, the second electrode of the first transistor, and the first electrode of the third transistor; The control electrode of the second transistor is connected to the second node, the first electrode is connected to the first power supply voltage terminal, and the second electrode is connected to the first node; The control electrode of the third transistor is connected to the second electrode of the first diode, the first electrode is connected to the second node, and the second electrode is connected to the third power supply voltage terminal; The control electrode of the fourth transistor is connected to the first electrode of the first diode, the first electrode is connected to the first node, and the second electrode is connected to the third power supply voltage terminal; The control electrode of the fifth transistor is connected to the first node, the first electrode is connected to the first power supply voltage terminal, and the second electrode is connected to the touch signal line; The second selection subcircuit includes: a second diode, a sixth transistor, a seventh transistor, an eighth transistor, a ninth transistor and a tenth transistor; A first electrode of the second diode is connected to the modulation subcircuit and the control electrode of the eighth transistor, and a second electrode is connected to the control electrode of the ninth transistor; The control electrode of the sixth transistor is connected to the third node, the first electrode is connected to the second power supply voltage terminal, and the second electrode is connected to the fourth node; the third node is the connection point of the control electrode of the sixth transistor, the second electrode of the seventh transistor, the first electrode of the ninth transistor and the control electrode of the tenth transistor; the fourth node is the connection point of the control electrode of the seventh transistor, the second electrode of the sixth transistor and the first electrode of the eighth transistor; The control electrode of the seventh transistor is connected to the fourth node, the first electrode is connected to the second power supply voltage terminal, and the second electrode is connected to the third node; The control electrode of the eighth transistor is connected to the first electrode of the second diode and the modulation subcircuit, the first electrode is connected to the fourth node, and the second electrode is connected to the third power supply voltage terminal; The control electrode of the ninth transistor is connected to the second electrode of the second diode, the first electrode is connected to the third node, and the second electrode is connected to the third power supply voltage terminal; The control electrode of the tenth transistor is connected to the third node, the first electrode is connected to the second power supply voltage terminal, and the second electrode is connected to the touch signal line.

2. The display module according to claim 1, characterized in that: The driving circuit is further configured to: According to the protocol requirements, the number of pulses of the touch synchronization signal within one frame display time is set to N; N is an integer greater than 1; When the touch synchronization signal and the vertical synchronization signal are both at valid levels, starting to count the number of pulses of the touch synchronization signal; When the number of pulses of the touch synchronization signal is N+1, this moment is determined as the starting moment of the first touch control stage; When the number of pulses of the touch synchronization signal is N+M, the moment is determined as the end moment of the first touch control stage and the start moment of the second touch control stage; M is an integer greater than or equal to 1 and less than N; When the number of pulses of the touch synchronization signal is 2N, this moment is determined as the termination moment of the second touch control stage.

3. The display module according to claim 1, characterized in that: In the display stage, the touch electrodes are multiplexed as common electrodes; the touch signal lines are multiplexed as common signal lines; the display panel also includes: a plurality of pixel electrodes, and a plurality of data signal lines connected to the pixel electrodes; the drive circuit is also configured to, in the display stage, input a common signal to the common electrode through the common signal line, and input a data signal to the pixel electrode through the data signal line.

4. A display device, characterized in that: Comprising a display module as described in any one of claims 1-3.

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