Display panel, driving method thereof, and display device

Abstract

The application discloses a display panel, a driving method thereof and a display device. The display panel comprises a plurality of sub-pixel groups, each of which comprises at least one sub-pixel. The cathodes of the sub-pixels are multiplexed as touch electrodes, and the cathodes of different sub-pixel groups are insulated from each other. In a frame, the working process of the display panel comprises a display stage and a touch stage. In the display stage, the cathodes are connected to a common voltage, and the sub-pixels can emit light. The touch stage comprises a plurality of touch sub-stages. In the plurality of touch sub-stages, the cathodes of the plurality of sub-pixel groups are connected to touch signals row by row or column by column, and the sub-pixel groups connected to the touch signals are in a black state. In the touch sub-stage, the signal connected to the sub-pixel group connected to the touch signal satisfies at least one of the following two conditions: the light-emitting control signal is a cutoff level; and the voltage difference between the anode and the voltage of the touch signal connected to the cathode is less than the turn-on voltage of the light-emitting element. The embodiments of the application can reduce the cost.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a display panel and its driving method, and a display device. Background Technology

[0002] With the development of display technology, touch display panels with touch functionality have been widely used.

[0003] In related technologies, the touch structure is positioned above the encapsulation layer, employing mutual capacitance touch recognition. However, this design requires a post-encapsulation process to fabricate the touch structure, necessitating additional functional modules in the manufacturing plant layout and increasing costs. Summary of the Invention

[0004] This application provides a display panel and its driving method, as well as a display device, which can reduce costs.

[0005] In a first aspect, embodiments of this application provide a display panel including multiple sub-pixel groups arranged in rows or columns. Each sub-pixel group includes at least one sub-pixel, and each sub-pixel includes a light-emitting element and a pixel circuit. The pixel circuit is connected to a light-emitting control signal. The light-emitting element includes an anode and a cathode. The anode is electrically connected to the pixel circuit, and the cathode is reused as a touch electrode. The cathodes of different sub-pixel groups are insulated from each other. Within one frame, the operation of the display panel includes a display stage and a touch stage. In the display stage, the cathode is connected to a common voltage, and the sub-pixel can emit light. The touch stage includes multiple touch sub-stages. In the multiple touch sub-stages, the cathodes of the multiple sub-pixel groups are connected to touch signals row by row or column by column, and the sub-pixel groups connected to touch signals are in a black state. In the touch sub-stage, the signals connected to the sub-pixel groups connected to touch signals satisfy at least one of the following two conditions: The light emission control signal is at the cutoff level; The voltage difference between the anode and the touch signal connected to the cathode is less than the activation voltage of the light-emitting element.

[0006] Secondly, embodiments of this application also provide a driving method for a display panel, which is used to drive the display panel. The display panel includes multiple sub-pixel groups, which are arranged in rows and columns. Each sub-pixel group includes at least one sub-pixel. Each sub-pixel includes a light-emitting element and a pixel circuit. A light-emitting control signal connected to the pixel circuit is used to control whether the light-emitting element emits light. The light-emitting element includes an anode and a cathode. The anode is electrically connected to the pixel circuit, and the cathode is reused as a touch electrode. The cathodes of different sub-pixel groups are insulated from each other. Within a single frame, the operation of the display panel includes a display phase and a touch phase, with the touch phase comprising multiple touch sub-phases. The driving methods include: During the display phase, a common voltage is supplied to the cathode to drive the sub-pixels to emit light; In multiple touch sub-stages, touch signals are provided to the cathodes of multiple sub-pixel groups row by row or column by column, and the sub-pixel groups that receive the touch signals are controlled to be in a black state. During the touch sub-stage, the signals received by the sub-pixel group that receive the touch signal satisfy at least one of the following two conditions: The light emission control signal is at the cutoff level; The voltage difference between the anode and the touch signal connected to the cathode is less than the activation voltage of the light-emitting element.

[0007] Thirdly, embodiments of this application also provide a display device, including a display panel as described in the first aspect embodiment.

[0008] According to the embodiments of this application, the cathode of the light-emitting element is time-division multiplexed as a functional component for driving the light-emitting element to emit light and a functional component for touch recognition. Compared with additionally fabricating touch electrodes above the encapsulation layer, the process of fabricating touch electrodes can be reduced, thereby reducing costs. In addition, by dividing a frame into a display stage and a touch stage, the cathode is connected to a common voltage during the display stage, enabling sub-pixels to emit light. The cathode is connected to touch signals in each touch sub-stage of the touch stage, enabling touch recognition. Furthermore, in the touch sub-stage, the condition that the signal connected to the sub-pixel group that receives the touch signal makes the sub-pixel group appear black can reduce the interference of the touch signal on the display effect and reduce the impact of the common voltage on the accuracy of touch recognition. Attached Figure Description

[0009] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings, in which the same or similar reference numerals denote the same or similar features, and the drawings are not drawn to scale.

[0010] Figure 1 This illustration shows a top view of a display panel provided in an embodiment of this application. Figure 2 This illustration shows a schematic diagram of a pixel circuit provided in an embodiment of this application; Figure 3 This illustration shows a cross-sectional structural diagram of a display panel provided in an embodiment of this application; Figure 4 This invention provides a timing diagram of a cathode in a display panel according to an embodiment of the present application. Figure 5 This illustration shows a timing diagram of the cathode of a multi-row sub-pixel group in a display panel provided in an embodiment of this application; Figure 6 for Figure 2 A timing diagram; Figure 7A top view of a row of sub-pixel groups in a display panel provided in an embodiment of this application; Figure 8 for Figure 7 A timing diagram; Figure 9 This illustration shows a timing diagram of the cathode of a multi-column sub-pixel group in a display panel provided in an embodiment of this application; Figure 10 This invention illustrates another timing diagram on the cathode of a multi-row sub-pixel group in a display panel provided in an embodiment of this application; Figure 11 This illustrates yet another timing diagram on the cathode of a multi-row sub-pixel group in a display panel provided in an embodiment of this application; Figure 12 This invention provides a timing diagram showing the cathodes of two display areas in a display panel according to an embodiment of the present application. Figure 13 This illustration shows a partition diagram of a display panel provided in an embodiment of this application; Figure 14 This illustration shows a flowchart of a display panel driving method provided in an embodiment of this application; Figure 15 This is a schematic diagram of a display device provided in an embodiment of this application. Detailed Implementation

[0011] The features and exemplary embodiments of various aspects of this application will now be described in detail. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this application and are not configured to limit this application. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples of this application.

[0012] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0013] It should be understood that when describing the structure of a component, when referring to a layer or region as being "above" or "on top of" another layer or region, it can mean that it is directly above the other layer or region, or that it contains other layers or regions between it and the other layer or region. Furthermore, if the component is flipped over, that layer or region will be located "below" or "under" the other layer or region.

[0014] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0015] In the embodiments of this application, the term "electrical connection" can refer to a direct electrical connection between two components, or it can refer to an electrical connection between two components via one or more other components.

[0016] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the implementation methods provided in the embodiments of this application can be combined with each other without contradiction.

[0017] As described in the background section, the high cost of placing the touch structure above the encapsulation layer in related technologies is a problem. In addition, as the size of the display panel increases, the capacitance between the touch electrode and ground increases in the mutual capacitance touch recognition method, which affects the accuracy of mutual capacitance recognition.

[0018] To address the aforementioned technical problems, this application provides a display panel and its driving method, as well as a display device. The following will describe various embodiments of the display panel and its driving method, as well as the display device, in conjunction with the accompanying drawings.

[0019] Please refer to the reference. Figures 1 to 3 The display panel 100 includes a plurality of sub-pixel groups 1, which are arranged in rows or columns. For example, a first direction X and a second direction Y intersect, the first direction X is a row direction and the second direction Y is a column direction, and the plurality of sub-pixel groups 1 are arranged in an array on the first direction X and the second direction Y.

[0020] Subpixel group 1 includes at least one subpixel 10. Subpixel 10 includes pixel circuitry 11 and light-emitting element 12. Light-emitting element 12 includes an anode 121 and a cathode 123. Light-emitting element 12 also includes a light-emitting layer 122. In the thickness direction Z of the display panel, the light-emitting layer 122 is located between the anode 121 and the cathode 123. Anode 121 is electrically connected to pixel circuitry 11.

[0021] During the display phase, the pixel circuit 11 drives the light-emitting element 12 to emit light. The pixel circuit receives a light-emitting control signal, which controls whether the light-emitting element emits light.

[0022] As an example, the pixel circuit 11 includes a driving transistor T3, a first light-emitting control transistor T1, and a second light-emitting control transistor T6. The first terminal of the first light-emitting control transistor T1 is electrically connected to the first power line PVDD, and the second terminal of the first light-emitting control transistor T1 is electrically connected to the first terminal of the driving transistor T3. The gate of the first light-emitting control transistor T1 is connected to the light-emitting control signal EM. The first terminal of the second light-emitting control transistor T6 is electrically connected to the second terminal of the driving transistor T3, and the second terminal of the second light-emitting control transistor T6 is electrically connected to the anode of the light-emitting element 12. The gate of the second light-emitting control transistor T6 is connected to the light-emitting control signal EM, which is transmitted via the light-emitting control signal line. The driving transistor T3 generates a driving current based on the written data signal. When the light-emitting control signal EM on the light-emitting control signal line is at the on level, the first light-emitting control transistor T1 and the second light-emitting control transistor T6 are turned on. The driving current generated by the driving transistor T3 flows into the anode of the light-emitting element 12, thereby charging the anode of the light-emitting element 12. When the voltage difference between the anode and the cathode of the light-emitting element 12 is greater than or equal to the turn-on voltage of the light-emitting element 12, the light-emitting element 12 emits light. When the light emission control signal EM on the light emission control signal line is at the cutoff level, the first light emission control transistor T1 and the second light emission control transistor T6 are cut off, and the light emission element 12 is in a black state, that is, the sub-pixel 10 is in a black state.

[0023] The on level of the light emission control signal EM is the level that controls the first light emission control transistor T1 and the second light emission control transistor T6 to be turned on, and the off level of the light emission control signal EM is the level that controls the first light emission control transistor T1 and the second light emission control transistor T6 to be turned off.

[0024] The activation voltage of the light-emitting element 12 is the minimum voltage required to light up the light-emitting element, which is the minimum voltage difference between the anode and the cathode.

[0025] It should be noted that, Figure 2 The specific structure of the pixel circuit shown is merely an example and is not intended to limit this application.

[0026] The cathode 123 of the light-emitting element 12 is reused as the touch electrode 2, and the cathodes 123 of different sub-pixel groups 1 are insulated from each other. That is to say, the number of sub-pixel groups 1 is the same as the number of touch electrodes 2, and the cathode 123 of one sub-pixel group 1 is reused as one touch electrode 2.

[0027] When the same sub-pixel group 1 includes multiple sub-pixels 10, the cathodes of the multiple sub-pixels 10 in the same sub-pixel group 1 are interconnected. For example, the cathodes of the multiple sub-pixels 10 in the same sub-pixel group 1 are a single structure.

[0028] For example, the display panel 100 includes M*N sub-pixel groups 1, and correspondingly, the display panel 100 includes M*N touch electrodes 2, which is equivalent to dividing the entire cathode of the display panel into M*N cathode blocks. The size of each cathode block (i.e., each touch electrode 2) can be determined according to the requirements of touch performance. For example, the orthographic projection of the touch electrode 2 on the substrate is a square with a side length of 4 millimeters (mm). Of course, this value is only an example and is not intended to limit this application.

[0029] For example, the display panel also includes a substrate 4, a pixel definition layer (PDL), and an encapsulation layer 5. The pixel circuit 11 is located on one side of the substrate 4, and the light-emitting element 12 is located on the side of the pixel circuit 11 away from the substrate 4. The pixel definition layer (PDL) includes an opening for defining the position of the light-emitting layer 122 of the light-emitting element 12. The encapsulation layer 5 is located on the side of the light-emitting element 12 away from the substrate 4 and is used to isolate moisture from damaging the light-emitting element 12.

[0030] For example, touch electrode 2 is connected to lead 3, and lead 3 is electrically connected to a driver chip (not shown in the figure). This application can employ a self-capacitance touch recognition method. During the touch phase, the driver chip provides touch signals to touch electrode 2 through lead 3 and receives the sensing signals from touch electrode 2 to identify the touch position. Compared to the problem of inaccurate recognition caused by the touch structure being located above the packaging layer and using mutual capacitance touch recognition in large-size products, this application of mutual capacitance recognition in large-size products can improve recognition accuracy.

[0031] Figure 4 This illustration shows a timing diagram of a cathode in a display panel provided in an embodiment of this application. That is, Figure 4 This refers to the timing sequence on a single lead 3. For example... Figure 4 As shown, within one frame F, the operation of the display panel can include a display phase D and a touch phase P.

[0032] Please refer to the reference. Figure 1 and Figure 4 In the display stage D, the cathode 123 is connected to a common voltage PVEE, and the sub-pixel connected to the common voltage PVEE can emit light.

[0033] The touch phase P includes multiple touch sub-phases Pa. In these sub-phases Pa, the cathodes 123 of multiple sub-pixel groups 1 are connected to the touch signal TP row by row or column by column, and the sub-pixel groups 1 connected to the touch signal TP are in a black state. It should be noted that... Figure 4 Different wiring configurations are used to represent the common voltage PVEE and the touch signal TP, respectively. Figure 4 The timing lines of the touch signal TP are not used to define the voltage relationship between the voltage of the touch signal TP and the common voltage PVEE.

[0034] For example, the display panel 100 includes M*N sub-pixel groups 1, and correspondingly, the display panel 100 includes M*N touch electrodes 2. In the display phase D, the cathodes 123 of the M*N sub-pixel groups 1 are all connected to a common voltage PVEE, thus enabling all M*N sub-pixel groups 1 to emit light in the display phase D. In the touch phase P, the driving chip scans the touch electrodes 2 row by row or column by column. Within one touch sub-phase Pa, one row or column of touch electrodes 2 is scanned. The touch electrodes 2 that are scanned are connected to the touch signal TP for touch recognition, while the touch electrodes 2 that are not scanned are not connected to the touch signal TP. When scanning the touch electrodes 2 row by row, multiple touch electrodes 2 in the same row are connected to the touch signal TP. When scanning the touch electrodes 2 column by column, multiple touch electrodes 2 in the same column are connected to the touch signal TP.

[0035] During the display stage D, the cathode 123 is connected to the common voltage PVEE, and the cathode 123 serves as a functional component to drive the light-emitting element 12 to emit light; during the touch sub-stage Pa, the cathode 123 is connected to the touch signal TP, and the cathode 123 serves as a functional component for touch recognition; that is, the cathode 123 is time-division multiplexed into different functional components in different stages.

[0036] In addition, during the touch sub-stage Pa, the signal received by sub-pixel group 1 that receives the touch signal TP satisfies at least one of the following two conditions: Condition 1: The light emission control signal EM connected to sub-pixel group 1 is at the cutoff level; Condition 2: The voltage difference between the anode voltage of the sub-pixel in sub-pixel group 1 and the voltage of the touch signal TP connected to the cathode is less than the activation voltage of the light-emitting element 12.

[0037] As an example, in the touch sub-stage Pa, the signals connected to the sub-pixel group 1 that are connected to the touch signal TP satisfy the following: the light emission control signal EM connected to the sub-pixel group 1 is at the cutoff level, and the voltage difference between the anode voltage of the sub-pixel in the sub-pixel group 1 and the cathode connected to the touch signal TP is less than the turn-on voltage of the light-emitting element 12.

[0038] As another example, in the touch sub-stage Pa, the signals connected to the sub-pixel group 1 that are connected to the touch signal TP satisfy the following: the light emission control signal EM connected to the sub-pixel group 1 is at the on level, and the voltage difference between the anode voltage of the sub-pixel in the sub-pixel group 1 and the cathode connected to the touch signal TP is less than the turn-on voltage of the light-emitting element 12.

[0039] As another example, in the touch sub-stage Pa, the signal connected to the sub-pixel group 1 that receives the touch signal TP satisfies the following: the light emission control signal EM connected to the sub-pixel group 1 is at the cutoff level, and the voltage difference between the anode voltage of the sub-pixel in the sub-pixel group 1 and the cathode voltage of the touch signal TP is greater than or equal to the turn-on voltage of the light-emitting element 12.

[0040] During the touch sub-stage Pa, when the light emission control signal EM is at the cutoff level, sub-pixel group 1 does not emit light, that is, sub-pixel group 1 is in a black state.

[0041] In the touch sub-stage Pa, when the voltage difference between the anode voltage of the light-emitting element 12 and the touch signal TP connected to the cathode is less than its activation voltage, the light-emitting element 12 does not emit light, that is, the sub-pixel group 1 is in a black state.

[0042] Either of the above two conditions can make the sub-pixel group 1 that receives the touch signal TP in the touch sub-stage Pa appear black, thereby separating the cathode 123 as a functional component for driving the light-emitting element 12 to emit light and the cathode 123 as a functional component for touch recognition. That is, when the sub-pixel group 1 emits light, its cathode does not serve as a functional component for touch recognition; when the cathode of the sub-pixel group 1 serves as a functional component for touch recognition, the cathode of the sub-pixel group 1 does not serve as a functional component for driving the light-emitting element 12 to emit light. In this way, the interference of the touch signal on the display effect can be reduced, and the impact of the common voltage on the accuracy of touch recognition can be reduced.

[0043] According to the embodiments of this application, the cathode 123 of the light-emitting element 12 is time-division multiplexed as a functional component for driving the light-emitting element 12 to emit light and a functional component for touch recognition. Compared with additionally fabricating touch electrodes above the encapsulation layer, the process of fabricating touch electrodes can be reduced, thereby reducing costs. In addition, by dividing a frame into a display stage and a touch stage, the cathode 123 is connected to a common voltage PVEE during the display stage, enabling sub-pixels to emit light. The cathode 123 is connected to touch signals TP in each touch sub-stage of the touch stage, enabling touch recognition. Furthermore, in the touch sub-stage, the signal connected to the sub-pixel group 1 that is connected to the touch signal TP makes the sub-pixel group appear black, which can reduce the interference of the touch signal on the display effect and reduce the impact of the common voltage on the accuracy of touch recognition.

[0044] In some embodiments, please refer to the reference Figure 1 and Figure 5 For example, the display panel includes M rows of subpixel groups 1. Figure 5 The cathode of the first row of sub-pixel group 1 is marked as 123 (1), the cathode of the second row of sub-pixel group 1 is marked as 123 (2), the cathode of the third row of sub-pixel group 1 is marked as 123 (3), and so on. The cathode of the Mth row of sub-pixel group 1 is marked as 123 (M). The touch stage P includes M touch sub-stages, and the M touch sub-stages are Pa (1), Pa (2), Pa (3) to Pa (M). In multiple touch sub-stages, the cathodes 123 of multiple sub-pixel groups 1 are connected to the touch signal TP row by row. In the touch sub-stage, the light-emitting control signal EM connected to the sub-pixel group 1 connected to the touch signal TP is at the cut-off level, and the voltage difference between the anode voltage of the light-emitting element 12 and the voltage of the touch signal connected to the cathode is greater than or equal to the turn-on voltage of the light-emitting element 12.

[0045] For example, in the first touch sub-stage Pa(1), the cathode 123(1) of the first row sub-pixel group 1 is connected to the touch signal TP, and the cathode 123(1) of the first row sub-pixel group 1 is used as the touch electrode 2 for touch recognition. At this time, the cathodes 123 of other row sub-pixel groups 1 are not connected to the touch signal. In addition, the light emission control signal connected to the first row sub-pixel group 1 is at the cutoff level, and the voltage difference between the anode voltage of the light emission element 12 in the first row sub-pixel group 1 and the voltage of the touch signal TP connected to the cathode 123(1) is greater than or equal to the turn-on voltage of the light emission element 12. In the second touch sub-stage Pa(2), the cathode 123(2) of the second row sub-pixel group 1 is connected to the touch signal TP, and the cathode 123(2) of the second row sub-pixel group 1 is used as the touch electrode 2 for touch recognition. At this time, the cathodes 123 of other row sub-pixel groups 1 are not connected to the touch signal. In addition, the light emission control signal connected to the second row sub-pixel group 1 is at the cutoff level, and the voltage difference between the anode voltage of the light emission element 12 in the second row sub-pixel group 1 and the voltage difference between the cathode 123(2) connected to the touch signal TP is greater than or equal to the turn-on voltage of the light emission element 12. In the third touch sub-stage Pa(3), the cathode 123(3) of the third row sub-pixel group 1 is connected to the touch signal TP, and the cathode 123(3) of the third row sub-pixel group 1 is used as the touch electrode 2 for touch recognition. At this time, the cathodes 123 of other row sub-pixel groups 1 are not connected to the touch signal. In addition, the light emission control signal connected to the third row sub-pixel group 1 is at the cutoff level, and the voltage difference between the anode voltage of the light emission element 12 in the third row sub-pixel group 1 and the voltage difference between the cathode 123(3) connected to the touch signal TP is greater than or equal to the turn-on voltage of the light emission element 12. Similarly, in the Mth touch sub-stage Pa(M), the cathode 123(M) of the Mth row sub-pixel group 1 is connected to the touch signal TP, and the cathode 123(M) of the Mth row sub-pixel group 1 is used as the touch electrode 2 for touch recognition. At this time, the cathodes 123 of other rows sub-pixel groups 1 are not connected to the touch signal. In addition, the light emission control signal connected to the Mth row sub-pixel group 1 is at the cutoff level, and the voltage difference between the anode voltage of the light emission element 12 in the Mth row sub-pixel group 1 and the voltage of the touch signal TP connected to the cathode 123(M) is greater than or equal to the turn-on voltage of the light emission element 12. In this way, during the entire touch phase P, the cathodes 123 (1) of each row of sub-pixel group 1 are used as touch electrodes for row-by-row touch scanning. For the current row of sub-pixel group 1 that has been touched, since the light emission control signal connected to the current row of sub-pixel group 1 is at the cutoff level, the pixel circuit will not provide current to the light emission element 12 in the first row of sub-pixel group 1. Even if the voltage difference between the anode voltage of the light emission element 12 in the current row of sub-pixel group 1 and the voltage of the touch signal TP connected to the cathode 123 is greater than or equal to the turn-on voltage of the light emission element 12, the light emission element 12 will not emit light. In other words, when the light emission control signal connected to the current row of sub-pixel group 1 is at the cutoff level, the touch signal connected to the cathode of the current row of sub-pixel group 1 does not need to meet the condition of turning off the light emission element. At this time, the touch signal only needs to meet the requirements of touch recognition. From another perspective, the higher the voltage of the touch signal connected to the cathode of the light-emitting element, the smaller the voltage difference between the anode voltage and the cathode voltage of the light-emitting element. Therefore, the voltage of the touch signal needs to be relatively large to meet the condition of turning off the light-emitting element. In this embodiment, the light-emitting element is not illuminated by using a cutoff voltage for the light-emitting control signal. At this time, the voltage of the touch signal TP can be relatively small. The touch signal TP only needs to meet the requirements of touch recognition, which can reduce power consumption.

[0046] In some embodiments, such as Figure 6 As shown, in the touch sub-stage Pa, the light emission control signal EM of the sub-pixel group that receives the touch signal TP is at the cutoff level (e.g., high level), and the sub-pixel group receives the touch signal TP before receiving the data signal.

[0047] For example, such as Figure 2 and Figure 6 As shown, the pixel circuit 11 also includes a data writing transistor T2 and a threshold compensation transistor T4. The first terminal of the data writing transistor T2 is electrically connected to the data line data, and the second terminal of the data writing transistor T2 is electrically connected to the first terminal of the driving transistor T3. The gate of the data writing transistor T2 is connected to the scan signal S2. The first terminal of the threshold compensation transistor T4 is electrically connected to the second terminal of the driving transistor T3, and the second terminal of the threshold compensation transistor T4 is electrically connected to the gate of the driving transistor T3. The gate of the threshold compensation transistor T4 is connected to the scan signal S2.

[0048] In this application, the transistor in the pixel circuit is a P-type transistor as an example. For a P-type transistor, its cutoff level is high and its conduction level is low.

[0049] The operation of the pixel circuit 11 includes a data writing stage b. In the data writing stage b, the data writing transistor T2 and the threshold compensation transistor T4 are turned on, and the data signal on the data line data is written to the gate of the driving transistor T3. The touch sub-stage Pa is before the data writing stage b, and the touch sub-stage Pa overlaps with the light emission control signal EM at the cutoff level.

[0050] Because parasitic capacitance may exist between the cathode 123 and the gate of the driving transistor T3, if the touch signal TP is connected to the cathode 123 after the data signal is written to the gate of the driving transistor T3, and the touch signal TP is a transition signal, the transition of the touch signal TP will inevitably affect the stability of the data signal written by the driving transistor T3. In this embodiment, the touch signal TP is connected to the cathode 123 before the data signal is written to the gate of the driving transistor T3, so as to reduce the impact of the touch signal TP on the stability of the data signal written by the driving transistor T3.

[0051] For example, such as Figure 7 and Figure 8 As shown, taking the first direction X as the row direction as an example, a row of subpixel group 1 can include multiple rows of subpixels 10. For example, a row of subpixel group 1 includes k rows of subpixels 10, namely the first row of subpixels 10 (1), the second row of subpixels 10 (2) to the kth row of subpixels 10 (k). Each row of subpixels 10 is written with a data signal row by row. For example, in the first data writing stage b (1), the data signal is written to the first row of subpixels 10 (1); in the second data writing stage b (2), the data signal is written to the second row of subpixels 10 (2); and so on, in the kth data writing stage b (k), the data signal is written to the kth row of subpixels 10 (k). The data writing stages of the k rows of subpixels 10 in a row of subpixel group 1 are progressively delayed. For example, the time when the cathode of a row of subpixel group 1 is connected to the touch signal TP is before the time when any row of subpixels in the row of subpixel group 1 is connected to the data signal.

[0052] In some embodiments, such as Figure 6 As shown, the time when the cathode 123 of the sub-pixel group receives the touch signal TP at least partially overlaps with the time of the reset phase c.

[0053] For example, such as Figure 2 and Figure 6 As shown, the pixel circuit 11 includes a gate reset transistor T5. The first terminal of the gate reset transistor T5 is electrically connected to the reset signal line Vref, and the second terminal of the gate reset transistor T5 is electrically connected to the gate of the driving transistor T3. The gate of the gate reset transistor T5 is connected to the scan signal S1. During the reset phase c, the gate reset transistor T5 is turned on, and the reset signal on the reset signal line Vref is written to the gate of the driving transistor T3, thereby resetting the gate of the driving transistor T3.

[0054] In the touch sub-stage Pa, the cathode 123 of the sub-pixel group receives the touch signal TP. The touch sub-stage Pa and the reset stage c overlap at least partially in time. Both the touch sub-stage Pa and the reset stage c are before the data writing stage b. If the touch sub-stage Pa and the reset stage c overlap at least partially, the duration of the touch sub-stage Pa can be extended as much as possible, thereby extending the touch recognition time and improving the accuracy of touch recognition.

[0055] As described above, the conditions for making sub-pixel group 1 appear black include condition 1 and condition 2. Below are some examples of using condition 2 to make sub-pixel group 1 appear black.

[0056] In some embodiments, such as Figure 2 As shown, the pixel circuit 10 is connected between the first power line PVDD and the anode of the light-emitting element 12. The first power line PVDD provides the first power supply voltage. When the first light-emitting control transistor T1 and the second light-emitting control transistor T6 are turned on, the driving current generated by the driving transistor T3 flows into the anode of the light-emitting element 12, thereby charging the anode of the light-emitting element 12. The maximum voltage that the anode of the light-emitting element 12 can be connected to is the first power supply voltage. In the touch sub-stage, for the sub-pixel group 1 that is connected to the touch signal TP, the voltage difference between the first power supply voltage and the voltage of the touch signal TP connected to the cathode 123 is less than the turn-on voltage of the light-emitting element 12.

[0057] During the touch control stage, when the voltage of the touch signal TP connected to the cathode 123 is constant, the greater the voltage connected to the anode of the light-emitting element 12, the greater the voltage difference between the anode and cathode of the light-emitting element 12, and the easier it is to light up the light-emitting element 12. However, during the touch control stage, the light-emitting element needs to be in a black state. In this embodiment, when the anode of the light-emitting element 12 is connected to the maximum first power supply voltage, the touch signal TP still satisfies the following: the voltage difference between the first power supply voltage and the voltage of the touch signal TP connected to the cathode 123 is less than the turn-on voltage of the light-emitting element 12, thereby ensuring that the light-emitting element is in a black state during the touch control stage.

[0058] In this article, the voltage difference between the anode and cathode of the light-emitting element refers to the value obtained by subtracting the cathode voltage from the anode voltage of the light-emitting element.

[0059] In some embodiments, the voltage of the touch signal TP is greater than the common voltage PVEE.

[0060] For example, the common voltage PVEE is a negative voltage, and the voltage of the touch signal TP is a positive voltage.

[0061] For example, the first power supply voltage provided by the first power line PVDD is 4.6V, the turn-on voltage of the light-emitting element is 2V, and the voltage of the touch signal TP is greater than or equal to 2.6V. Thus, the voltage difference between the first power supply voltage and the touch signal TP is less than 2V, making the sub-pixel group 1 black in the touch sub-stage.

[0062] In this embodiment, the voltage of the touch signal TP is greater than the common voltage PVEE, which can reduce the voltage difference between the anode and cathode of the light-emitting element, thereby better ensuring that the sub-pixel group 1 is in a black state during the touch sub-stage.

[0063] In some embodiments, such as Figure 1 and Figure 2 As shown, during the touch phase P, all sub-pixel groups 1 are in a black state. That is to say, during the entire touch phase P, the display panel is completely black, so that the touch scanning in each touch sub-phase will not be affected by the display, which can improve the accuracy of touch position recognition.

[0064] In some embodiments, please refer to Figure 5 The display panel includes M rows of sub-pixel groups 1. Correspondingly, the touch phase P includes M touch sub-phases. In multiple touch sub-phases, the cathodes 123 of multiple sub-pixel groups 1 are connected to the touch signal TP row by row. In the touch sub-phase, the cathodes of sub-pixel groups 1 that are not connected to the touch signal TP are connected to the reference voltage Vf. The voltage difference between the anode voltage of the sub-pixel groups 1 that are not connected to the touch signal TP and the reference voltage Vf is less than the activation voltage of the light-emitting element 12.

[0065] For example, in the first touch sub-stage Pa(1), the cathode 123(1) of the first row sub-pixel group 1 is connected to the touch signal TP. At this time, the cathode 123 of other row sub-pixel groups 1 is not connected to the touch signal, and the cathode 123 of other row sub-pixel groups 1 is connected to the reference voltage Vf. In the second touch sub-stage Pa(2), the cathode 123(2) of the second row sub-pixel group 1 is connected to the touch signal TP. At this time, the cathode 123 of the other row sub-pixel group 1 is not connected to the touch signal, and the cathode 123 of the other row sub-pixel group 1 is connected to the reference voltage Vf. In the third touch sub-stage Pa(3), the cathode 123(3) of the third row sub-pixel group 1 is connected to the touch signal TP. At this time, the cathode 123 of the other row sub-pixel groups 1 is not connected to the touch signal, and the cathode 123 of the other row sub-pixel groups 1 is connected to the reference voltage Vf. Similarly, in the Mth touch sub-stage Pa(M), the cathode 123(M) of the Mth row sub-pixel group 1 is connected to the touch signal TP. At this time, the cathodes 123 of other row sub-pixel groups 1 are not connected to the touch signal, and the cathodes 123 of other row sub-pixel groups 1 are connected to the reference voltage Vf.

[0066] For example, the maximum anode voltage of the light-emitting element 12 is 4.6V, the start-up voltage of the light-emitting element is 2V, and the reference voltage Vf can be 4V.

[0067] Since the voltage difference between the anode voltage and the reference voltage Vf of the sub-pixel group 1 that is not connected to the touch signal TP is less than the turn-on voltage of the light-emitting element 12, and the voltage difference between the anode voltage and the touch signal TP of the sub-pixel group 1 that is connected to the touch signal TP is less than the turn-on voltage of the light-emitting element 12, the display panel is completely black throughout the entire touch phase P.

[0068] In some embodiments, such as Figure 5 As shown, the voltage of the touch signal TP is greater than the reference voltage Vf.

[0069] There are a large number of parasitic capacitances between the cathode and other structures of the display panel (such as the anode, transistors, metal traces, etc.). Noise from other structures will be superimposed on the cathode. If the voltage of the touch signal TP is relatively low, the low-voltage touch signal is easily "eaten up" by noise, resulting in a significant drop in the signal-to-noise ratio (SNR).

[0070] During the touch control stage, the voltage on the cathode jumps from the reference voltage Vf to the voltage of the touch signal TP. In this embodiment, the voltage of the touch signal TP is relatively high. The higher touch voltage can "overpower" the low noise and ensure the accuracy of touch recognition.

[0071] For example, the voltage of the touch signal TP is greater than the reference voltage Vf, and the reference voltage Vf is greater than the common voltage PVEE.

[0072] In some embodiments, when each sub-pixel group 1 is in a black state during the touch phase P, if the number of columns of sub-pixel group 1 is less than the number of rows of sub-pixel group 1, the cathode columns 123 of multiple sub-pixel groups 1 are connected to the touch signal TP during multiple touch sub-phases.

[0073] The display panel includes M rows and N columns of sub-pixel groups 1, where M > N. In this case, during the touch phase, the cathodes of each column of sub-pixel groups can be touched sequentially.

[0074] For example, in the first touch sub-stage Pa(1), the cathode 123(1) of the first column of sub-pixel group 1 is connected to the touch signal TP, and the cathode 123(1) of the first column of sub-pixel group 1 is used as the touch electrode 2 for touch recognition. At this time, the cathodes 123 of other columns of sub-pixel group 1 are not connected to the touch signal. In addition, the voltage difference between the anode voltage of the light-emitting element 12 in the first column of sub-pixel group 1 and the voltage difference between the cathode 123(1) connected to the touch signal TP is less than the activation voltage of the light-emitting element 12. In the second touch sub-stage Pa(2), the cathode 123(2) of the second column sub-pixel group 1 is connected to the touch signal TP, and the cathode 123(2) of the second column sub-pixel group 1 is used as the touch electrode 2 for touch recognition. At this time, the cathodes 123 of other column sub-pixel groups 1 are not connected to the touch signal. In addition, the voltage difference between the anode voltage of the light-emitting element 12 in the second column sub-pixel group 1 and the voltage difference between the cathode 123(2) connected to the touch signal TP is less than the activation voltage of the light-emitting element 12. In the third touch sub-stage Pa(3), the cathode 123(3) of the third column sub-pixel group 1 is connected to the touch signal TP, and the cathode 123(3) of the third column sub-pixel group 1 is used as the touch electrode 2 for touch recognition. At this time, the cathodes 123 of other columns sub-pixel groups 1 are not connected to the touch signal. In addition, the voltage difference between the anode voltage of the light-emitting element 12 in the third column sub-pixel group 1 and the voltage difference between the cathode 123(3) connected to the touch signal TP is less than the activation voltage of the light-emitting element 12. Similarly, in the Nth touch sub-stage Pa(N), the cathode 123(N) of the Nth column sub-pixel group 1 is connected to the touch signal TP, and the cathode 123(N) of the Nth column sub-pixel group 1 is used as the touch electrode 2 for touch recognition. At this time, the cathodes 123 of other columns of sub-pixel groups 1 are not connected to the touch signal. In addition, the voltage difference between the anode voltage of the light-emitting element 12 in the Nth column sub-pixel group 1 and the voltage of the touch signal TP connected to the cathode 123(N) is less than the activation voltage of the light-emitting element 12.

[0075] Since the light emission control signal usually scans each row of sub-pixels one by one, if the touch scan is performed column by column, the light emission control signal usually cannot control the sub-pixel group in the same column to be in a black state during the touch sub-stage; therefore, when the touch scan is performed column by column, the voltage difference between the anode voltage of the current column sub-pixel group and the touch signal TP connected to the cathode 123 (N) can be controlled to be less than the turn-on voltage of the light emission element 12.

[0076] In this embodiment, the number of columns in the sub-pixel group is relatively small. By performing column-by-column touch scanning, the touch reporting rate can be improved, thereby improving the accuracy of touch recognition.

[0077] Of course, when the number of rows in a sub-pixel group is small, touch scanning can be performed row by row.

[0078] The above Figure 5 and Figure 9 The example illustrates that during the touch phase P, all sub-pixel groups 1 in each row are in a black state.

[0079] In other embodiments, during multiple touch sub-stages, the cathodes 123 of multiple sub-pixel groups 1 are sequentially connected to the touch signal TP. During a touch sub-stage, at least one row of sub-pixel groups 1 that is not connected to the touch signal TP can emit light. That is, the current row of sub-pixel groups detected by touch scanning is in a black state, while at least one row of sub-pixel groups not detected by touch scanning can emit light. This can extend the light-emitting time of at least some rows of sub-pixels and improve the display effect.

[0080] In some embodiments, during the touch sub-stage, each row of sub-pixel group 1 that has not been connected to the touch signal TP can emit light.

[0081] Understandably, the conditions under which a sub-pixel group not detected by touch can emit light include: the voltage difference between the anode and cathode of the sub-pixel group not detected by touch is greater than or equal to the turn-on voltage of the light-emitting element.

[0082] For example, such as Figure 10 As shown, in the first touch sub-stage Pa(1), the cathode 123(1) of the first row sub-pixel group 1 is connected to the touch signal TP, and the cathode 123(1) of the first row sub-pixel group 1 is used as the touch electrode 2 for touch recognition. At this time, the cathodes 123 of other rows sub-pixel groups 1 are not connected to the touch signal. In addition, the light emission control signal connected to the first row sub-pixel group 1 is at the cut-off level, and the voltage difference between the anode voltage of the light emission element 12 in the first row sub-pixel group 1 and the voltage of the touch signal TP connected to the cathode 123(1) is greater than or equal to the turn-on voltage of the light emission element 12. In addition, the light emission control signals connected to the second row sub-pixel group 1 to the Mth row sub-pixel group 1 include the on level, and the voltage difference between the anode and cathode of the second row sub-pixel group 1 to the Mth row sub-pixel group 1 is greater than or equal to the turn-on voltage of the light emission element 12. In the second touch sub-stage Pa(2), the cathode 123(2) of the second row sub-pixel group 1 is connected to the touch signal TP, and the cathode 123(2) of the second row sub-pixel group 1 is used as the touch electrode 2 for touch recognition. At this time, the cathodes 123 of other rows sub-pixel groups 1 are not connected to the touch signal. In addition, the light emission control signal connected to the second row sub-pixel group 1 is at the cut-off level, and the voltage difference between the anode voltage of the light emission element 12 in the second row sub-pixel group 1 and the voltage difference between the cathode 123(2) connected to the touch signal TP is greater than or equal to the turn-on voltage of the light emission element 12. In addition, the light emission control signals connected to the first row sub-pixel group 1 and the third row sub-pixel group 1 to the Mth row sub-pixel group 1 include the on level, and the voltage difference between the anode and cathode of the first row sub-pixel group 1 and the second row sub-pixel group 1 to the Mth row sub-pixel group 1 is greater than or equal to the turn-on voltage of the light emission element 12. In the third touch sub-stage Pa(3), the cathode 123(3) of the third row sub-pixel group 1 is connected to the touch signal TP, and the cathode 123(3) of the third row sub-pixel group 1 is used as the touch electrode 2 for touch recognition. At this time, the cathodes 123 of other row sub-pixel groups 1 are not connected to the touch signal. In addition, the light emission control signal connected to the third row sub-pixel group 1 is at the cut-off level, and the voltage difference between the anode voltage of the light emission element 12 in the third row sub-pixel group 1 and the voltage difference between the cathode 123(3) connected to the touch signal TP is greater than or equal to the turn-on voltage of the light emission element 12. In addition, the light emission control signals connected to the first row sub-pixel group 1, the second row sub-pixel group 1 and the fourth row sub-pixel group 1 to the Mth row sub-pixel group 1 include the on level, and the voltage difference between the anode and cathode of the first row sub-pixel group 1, the second row sub-pixel group 1 and the fourth row sub-pixel group 1 to the Mth row sub-pixel group 1 is greater than or equal to the turn-on voltage of the light emission element 12. Similarly, in the Mth touch sub-stage Pa(M), the cathode 123(M) of the Mth row sub-pixel group 1 is connected to the touch signal TP, and the cathode 123(M) of the Mth row sub-pixel group 1 serves as the touch electrode 2 for touch recognition. At this time, the cathodes 123 of other rows of sub-pixel groups 1 are not connected to the touch signal. In addition, the light-emitting control signal connected to the Mth row sub-pixel group 1 is at the cut-off level, and the voltage difference between the anode voltage of the light-emitting element 12 in the Mth row sub-pixel group 1 and the voltage of the touch signal TP connected to the cathode 123(M) is greater than or equal to the turn-on voltage of the light-emitting element 12. In addition, the light-emitting control signals connected to the first row sub-pixel group 1 to the (M-1)th row sub-pixel group 1 include the on level, and the voltage difference between the anode and cathode of the first row sub-pixel group 1 to the (M-1)th row sub-pixel group 1 is greater than or equal to the turn-on voltage of the light-emitting element 12. In this way, during the entire touch phase P, the cathodes 123 (1) of each row of sub-pixel group 1 are used as touch electrodes for row-by-row touch scanning; and each row of sub-pixel group 1 that is not touched can emit light.

[0083] In some embodiments, such as Figure 10 As shown, in the touch sub-stage, the cathodes 123 of each row of sub-pixel group 1 that are not connected to the touch signal TP are connected to the common voltage PVEE.

[0084] For example, in the first touch sub-stage Pa(1), the cathode 123(1) of the first row of sub-pixel group 1 is touched and scanned, and the cathodes 123 of the second row of sub-pixel group 1 to the Mth row of sub-pixel group 1 are connected to the common voltage PVEE. In the second touch sub-stage Pa(2), touch scanning is performed on the cathode 123(2) of the second row sub-pixel group 1, and the cathodes 123 of the first row sub-pixel group 1 and the second row sub-pixel group 1 to the Mth row sub-pixel group 1 are connected to the common voltage PVEE. In the third touch sub-stage Pa(3), touch scanning is performed on the cathode 123(3) of the third row sub-pixel group 1, and the cathodes 123 of the first row sub-pixel group 1, the second row sub-pixel group 1 and the fourth row sub-pixel group 1 to the Mth row sub-pixel group 1 are connected to the common voltage PVEE. Similarly, in the Mth touch sub-stage Pa(M), touch scanning is performed on the cathode 123(M) of the Mth row sub-pixel group 1, and the cathodes 123 of the first row sub-pixel group 1 to the M-1th row sub-pixel group 1 are connected to the common voltage PVEE.

[0085] In this embodiment, the voltage connected to the cathode 123 of the sub-pixel group 1 that can emit light in the touch sub-stage and the voltage connected to the cathode of the sub-pixel group 1 in the display stage D are both common voltage PVEE, which can simplify the number of required signals and simplify the driving timing.

[0086] In some embodiments, during a touch sub-stage, if at least one row of subpixel group 1 that has not been connected to the touch signal TP can emit light, in the i-th touch sub-stage, the cathode of the i-th row of subpixel group 1 is connected to the touch signal TP; and in the i-th touch sub-stage, the j-th row of subpixel group 1 is in a black state, the j-th row of subpixel group 1 is adjacent to the i-th row of subpixel group 1, and other rows of subpixel groups 1 other than the i-th row of subpixel group 1 and the j-th row of subpixel group 1 can emit light, where i and j are both integers greater than or equal to 1.

[0087] For example, such as Figure 11 As shown, in the first touch sub-stage Pa(1), the cathode 123(1) of the first row of sub-pixel group 1 is connected to the touch signal TP, the second row of sub-pixel group 1 is in a black state, and the third row of sub-pixel group 1 to the last row of sub-pixel group can emit light. In the second touch sub-stage Pa(2), the cathode 123(2) of the second row sub-pixel group 1 is connected to the touch signal TP. The first row sub-pixel group 1 and the third row sub-pixel group 1 are adjacent to the second row sub-pixel group 1. The first row sub-pixel group 1 and the third row sub-pixel group 1 are in a black state. The fourth row sub-pixel group 1 to the last row sub-pixel group can emit light. In the third touch sub-stage Pa(3), the cathode 123(3) of the third row sub-pixel group 1 is connected to the touch signal TP. The second row sub-pixel group 1 and the fourth row sub-pixel group 1 are adjacent to the third row sub-pixel group 1. The second row sub-pixel group 1 and the fourth row sub-pixel group 1 are in a black state. The first row sub-pixel group 1 can emit light, and the fifth row sub-pixel group 1 to the last row sub-pixel group can emit light; and so on.

[0088] In this embodiment, when the touch scan detects the i-th row of sub-pixel groups, the j-th sub-pixel group adjacent to the i-th sub-pixel group is in a black state, while the other row sub-pixel groups besides the i-th and j-th row sub-pixel groups can emit light. This can reduce the accuracy of touch recognition based on the cathode of the i-th row sub-pixel group and extend the light emission time of other row sub-pixel groups, thereby improving the display effect.

[0089] In some embodiments, when the cathode of the i-th row sub-pixel group 1 is connected to the touch signal TP in the i-th touch sub-stage, the cathode of the j-th row sub-pixel group 1 can be connected to a reference voltage, and the voltage difference between the reference voltage connected to the anode and cathode of the j-th row sub-pixel group 1 is less than the turn-on voltage of the light-emitting element.

[0090] For example, such as Figure 11 As shown, in the first touch sub-stage Pa(1), the cathode 123(1) of the first row sub-pixel group 1 is connected to the touch signal TP, and the cathode 123(2) of the second row sub-pixel group 1 is connected to the reference voltage Vf, so that the second row sub-pixel group 1 is in a black state. In the second touch sub-stage Pa(2), the cathode 123(2) of the second row sub-pixel group 1 is connected to the touch signal TP. The first row sub-pixel group 1 and the third row sub-pixel group 1 are adjacent to the second row sub-pixel group 1. The cathode 123(1) of the first row sub-pixel group 1 and the cathode 123(3) of the third row sub-pixel group 1 are connected to the reference voltage Vf, so that the first row sub-pixel group 1 and the third row sub-pixel group 1 are in a black state. In the third touch sub-stage Pa(3), the cathode 123(3) of the third row sub-pixel group 1 is connected to the touch signal TP. The second row sub-pixel group 1 and the fourth row sub-pixel group 1 are adjacent to the third row sub-pixel group 1. The cathode 123(2) of the second row sub-pixel group 1 and the cathode 123(4) of the fourth row sub-pixel group 1 make the second row sub-pixel group 1 and the fourth row sub-pixel group 1 appear black; and so on.

[0091] In some embodiments, when the cathode of the i-th row sub-pixel group 1 is connected to the touch signal TP in the i-th touch sub-stage, the cathodes of the i-th row sub-pixel group 1 and other row sub-pixel groups other than the adjacent j-th row sub-pixel group 1 are connected to a common voltage.

[0092] For example, such as Figure 11 As shown, in the first touch sub-stage Pa(1), the cathode 123(1) of the first row of sub-pixel group 1 is connected to the touch signal TP, and the cathodes 123(3) of the third row of sub-pixel group 1 to the cathodes of the last row of sub-pixel group are connected to the common voltage PVEE, so that the third row of sub-pixel group 1 to the last row of sub-pixel group can emit light. In the second touch sub-stage Pa(2), the cathode 123(2) of the second row sub-pixel group 1 is connected to the touch signal TP, and the cathode 123(4) of the fourth row sub-pixel group 1 to the cathode of the last row sub-pixel group are connected to the common voltage PVEE, so that the fourth row sub-pixel group 1 to the last row sub-pixel group can emit light. In the third touch sub-stage Pa(3), the cathode 123(3) of the third row sub-pixel group 1 is connected to the touch signal TP, and the cathode 123(1) of the first row sub-pixel group 1 and the cathodes of the fifth row sub-pixel group 1 to the last row sub-pixel group are connected to the common voltage PVEE, so that the first row sub-pixel group 1 can emit light, and the fifth row sub-pixel group 1 to the last row sub-pixel group can emit light; and so on.

[0093] Optional, such as Figure 11 As shown, in the first touch sub-stage Pa(1), the cathode 123(1) of the first row of sub-pixel group 1 is connected to the touch signal TP; the cathode 123(2) of the second row of sub-pixel group 1 is connected to the reference voltage Vf, so that the second row of sub-pixel group 1 is in a black state; the cathode 123(3) of the third row of sub-pixel group 1 to the cathode of the last row of sub-pixel group are connected to the common voltage PVEE, so that the third row of sub-pixel group 1 to the last row of sub-pixel group can emit light; In the second touch sub-stage Pa(2), the cathode 123(2) of the second row sub-pixel group 1 is connected to the touch signal TP; the cathode 123(1) of the first row sub-pixel group 1 and the cathode 123(3) of the third row sub-pixel group 1 are connected to the reference voltage Vf, so that the first row sub-pixel group 1 and the third row sub-pixel group 1 are in a black state; the cathode 123(4) of the fourth row sub-pixel group 1 to the cathode of the last row sub-pixel group are connected to the common voltage PVEE, so that the fourth row sub-pixel group 1 to the last row sub-pixel group can emit light; In the third touch sub-stage Pa(3), the cathode 123(3) of the third row sub-pixel group 1 is connected to the touch signal TP; the cathode 123(2) of the second row sub-pixel group 1 and the cathode 123(4) of the fourth row sub-pixel group 1 make the second row sub-pixel group 1 and the fourth row sub-pixel group 1 black; the cathode 123(1) of the first row sub-pixel group 1 and the cathodes of the fifth row sub-pixel group 1 to the last row sub-pixel group are connected to the common voltage PVEE, so that the first row sub-pixel group 1 can emit light, and the fifth row sub-pixel group 1 to the last row sub-pixel group can emit light; and so on.

[0094] In some embodiments, such as Figure 5 , Figure 9 , Figure 10 or Figure 11 As shown, during display stage D, the common voltage PVEE connected to each sub-pixel group is the same. In this embodiment, the common voltage provided by the driving chip to each sub-pixel can be the same, which simplifies the driving timing.

[0095] In other embodiments, such as Figure 12 As shown, in display stage D, at least two sub-pixel groups can be connected to different common voltages.

[0096] For example, such as Figure 12 and Figure 13 As shown, the display panel includes a first display area A1 and a second display area A2. During the display stage D, the maximum gray level of the first display area A1 is less than the maximum gray level of the second display area. The cathode 123 (A1) of the sub-pixel group of the first display area A1 is connected to the first common voltage PVEE1, and the cathode 123 (A2) of the sub-pixel group of the second display area A2 is connected to the second common voltage PVEE2. The absolute value of the first common voltage PVEE1 is less than the absolute value of the second common voltage PVEE2.

[0097] The first display area A1 includes at least one sub-pixel group 1. When the sub-pixel group 1 includes at least one sub-pixel, and the sub-pixel group 1 includes multiple sub-pixels, the maximum gray level of the first display area A1 is the maximum gray level of the multiple sub-pixel groups 1 within the first display area A1.

[0098] The second display area A2 includes at least one sub-pixel group 1. When the sub-pixel group 1 includes at least one sub-pixel, and the sub-pixel group 1 includes multiple sub-pixels, the maximum gray level of the second display area A2 is the maximum gray level of the multiple sub-pixel groups 1 within the second display area A2.

[0099] For example, the maximum gray level of the first display area A1 is 120 gray levels, and the first common voltage PVEE1 is -1.5V; the maximum gray level of the second display area A2 is 255 gray levels, and the second common voltage PVEE2 is -3V.

[0100] The higher the grayscale, the greater the brightness. The common voltage is usually a negative voltage. Therefore, the larger the absolute value of the common voltage, the greater the brightness of the sub-pixels. The first common voltage PVEE1 and the second common voltage PVEE2 are both negative voltages. The absolute value of the first common voltage PVEE1 is smaller than the absolute value of the second common voltage PVEE2. This satisfies the brightness requirements of the first display area A1 and the second display area A2 respectively, while also reducing power consumption.

[0101] In some embodiments, the first common voltage PVEE1 connected to the sub-pixel group of the first display area A1 is the saturation voltage with the smallest absolute value. The saturation voltage refers to the maximum common voltage that causes the driving transistor of the pixel circuit to operate in the saturation region.

[0102] When the common voltage is sufficient to keep the driving transistors of the pixel circuit in the saturation region, the brightness of the sub-pixels will not change much when the common voltage is adjusted.

[0103] The first common voltage PVEE1 is the saturation voltage with the smallest absolute value. It can be understood that if the absolute value of the first common voltage PVEE1 increases by a certain amount, the brightness change of the sub-pixel will be relatively large. For example, if the absolute value of the first common voltage PVEE1 increases by 0.1V, the brightness change of the sub-pixel will be greater than 1%. The first common voltage PVEE1 can refer to the critical saturation voltage.

[0104] In this embodiment, although the absolute value of the first common voltage PVEE1 of the first display area A1 is small, the first common voltage PVEE1 is still sufficient to make the driving transistor of the first display area A1 work in the saturation region, which can minimize power consumption and avoid affecting the brightness of the first display area A1 as much as possible.

[0105] Based on the same technical concept, this application also provides a driving method for a display panel. The driving method is used to drive the display panel, which includes multiple sub-pixel groups arranged in rows and columns. Each sub-pixel group includes at least one sub-pixel, and each sub-pixel includes a light-emitting element and a pixel circuit. A light-emitting control signal connected to the pixel circuit is used to control whether the light-emitting element emits light. The light-emitting element includes an anode and a cathode. The anode is electrically connected to the pixel circuit, and the cathode is reused as a touch electrode. The cathodes of different sub-pixel groups are insulated from each other. Within one frame, the operation of the display panel includes a display stage and a touch stage, and the touch stage includes multiple touch sub-stages.

[0106] like Figure 14 As shown, the driving method includes steps 141 and 142: Step 141: In the display stage, a common voltage is provided to the cathode to drive the sub-pixel to emit light; Step 142: In multiple touch sub-stages, touch signals are provided to the cathodes of multiple sub-pixel groups row by row or column by column, and the sub-pixel groups that receive the touch signals are controlled to be in a black state. In the touch sub-stage, the signals accessed by the sub-pixel group that receive the touch signal satisfy at least one of the following two conditions: The light emission control signal is at the cutoff level; The voltage difference between the anode and the touch signal connected to the cathode is less than the activation voltage of the light-emitting element.

[0107] According to the embodiments of this application, the cathode of the light-emitting element is time-division multiplexed as a functional component for driving the light-emitting element to emit light and a functional component for touch recognition. Compared with additionally fabricating touch electrodes above the encapsulation layer, the process of fabricating touch electrodes can be reduced, thereby reducing costs. In addition, by dividing a frame into a display stage and a touch stage, the cathode is connected to a common voltage during the display stage, enabling sub-pixels to emit light. The cathode is connected to touch signals in each touch sub-stage of the touch stage, enabling touch recognition. Furthermore, in the touch sub-stage, the condition that the signal connected to the sub-pixel group that receives the touch signal makes the sub-pixel group appear black can reduce the interference of the touch signal on the display effect and reduce the impact of the common voltage on the accuracy of touch recognition.

[0108] In some embodiments, the method further includes: In multiple touch sub-stages, touch signals are provided row by row to the cathodes of multiple sub-pixel groups; During the touch sub-stage, the light emission control signal provided to the sub-pixel group that receives the touch signal is at the cutoff level, and the voltage difference between the anode and the touch signal received by the cathode is greater than or equal to the turn-on voltage of the light-emitting element.

[0109] In some embodiments, the method further includes: During the touch sub-stage, the light emission control signal provided to the sub-pixel group that receives the touch signal is at the cutoff level, and the touch signal is provided before the data signal is written to the sub-pixel group.

[0110] In some embodiments, the method further includes: The timing of the cathode of the control sub-pixel group receiving the touch signal overlaps at least partially with the timing of the gate of the driving transistor in the sub-pixel group receiving the reset signal.

[0111] In some embodiments, the maximum voltage connected to the anode is a first power supply voltage, and in the touch sub-stage, the method further includes: For the sub-pixel group that receives the touch signal, the voltage difference between the first power supply voltage and the touch signal connected to the cathode is controlled to be less than the turn-on voltage of the light-emitting element.

[0112] In some embodiments, the method further includes: The voltage controlling the touch signal is greater than the common voltage.

[0113] In some embodiments, the method further includes: During the touch phase, each sub-pixel group is controlled to be in a black state.

[0114] In some embodiments, the method further includes: During the touch sub-stage, a reference voltage is provided to the cathode of the sub-pixel group that has not received a touch signal. The voltage difference between the anode voltage and the reference voltage connected to the cathode is less than the light-emitting element's activation voltage.

[0115] In some embodiments, the method further includes: The voltage controlling the touch signal is greater than the reference voltage.

[0116] In some embodiments, the number of columns in a sub-pixel group is less than the number of rows in the sub-pixel group; the method further includes: In multiple touch sub-stages, touch signals are provided column by column to the cathodes of multiple sub-pixel groups.

[0117] In some embodiments, the method further includes: In multiple touch sub-stages, touch signals are provided row by row to the cathodes of multiple sub-pixel groups; During the touch sub-stage, control at least one row of sub-pixels that has not received a touch signal to emit light.

[0118] In some embodiments, the method further includes: During the touch sub-stage, each row of sub-pixels that is not connected to the touch signal can emit light.

[0119] In some embodiments, the method further includes: During the touch sub-stage, a common voltage is provided to the cathodes of each row of sub-pixels that have not received a touch signal.

[0120] In some embodiments, the method further includes: In the i-th touch sub-stage, a touch signal is provided to the cathode of the i-th row of sub-pixels, and the i-th row of sub-pixels is controlled to be in a black state; The i-th row of subpixels is controlled to be in a black state, and the i-th row of subpixels and other rows of subpixels (excluding the i-th row of subpixels and its adjacent j-th row of subpixels) are controlled to be able to emit light. i and j are both integers greater than or equal to 1.

[0121] In some embodiments, the method further includes: In the i-th touch sub-stage, a reference voltage is provided to the cathode of the j-th row of sub-pixels adjacent to the i-th row of sub-pixels. The voltage difference between the anode voltage and the reference voltage connected to the cathode is less than the light-up voltage of the light-emitting element.

[0122] In some embodiments, the method further includes: In the i-th touch sub-stage, a common voltage is provided to the cathodes of the i-th row of sub-pixels and the other row of sub-pixels excluding the j-th row of sub-pixels.

[0123] In some embodiments, the method further includes: During the display phase, the same common voltage is provided to each sub-pixel group.

[0124] In some embodiments, the display panel includes a first display area and a second display area, wherein during the display phase, the maximum grayscale of the first display area is smaller than the maximum grayscale of the second display area, and the method further includes: The absolute value of the common voltage provided to the sub-pixel group of the first display area is less than the absolute value of the common voltage provided to the sub-pixel group of the second display area.

[0125] In some embodiments, the method further includes: The common voltage provided to the sub-pixel group of the first display area is the saturation voltage with the smallest absolute value. The saturation voltage refers to the common voltage that makes the driving transistor of the pixel circuit work in the saturation region.

[0126] This application also provides a display device, including the display panel provided in this application. Please refer to... Figure 15 , Figure 15 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Figure 15 The provided display device 1000 includes the display panel 100 provided in any of the above embodiments of this application. Figure 15 This embodiment uses a mobile phone as an example to illustrate the display device 1000. It is understood that the display device provided in this application embodiment can be other display devices with display functions, such as wearable products, computers, televisions, and in-vehicle display devices; this application does not impose specific limitations on these. The display device provided in this application embodiment has the beneficial effects of the display panel provided in this application embodiment. For details, please refer to the specific descriptions of the display panel in the above embodiments; these will not be repeated here.

[0127] The embodiments described above are not exhaustive, nor do they limit the application to the specific embodiments described herein. Clearly, many modifications and variations can be made based on the above description. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to effectively utilize this application and its modifications. This application is limited only by the claims and their full scope and equivalents.

Claims

1. A display panel, characterized in that, It includes multiple sub-pixel groups, which are arranged in rows or columns. Each sub-pixel group includes at least one sub-pixel. Each sub-pixel includes a light-emitting element and a pixel circuit. The pixel circuit is connected to a light-emitting control signal. The light-emitting element includes an anode and a cathode. The anode is electrically connected to the pixel circuit. The cathode is reused as a touch electrode. The cathodes of different sub-pixel groups are mutually insulated. Within one frame, the operation of the display panel includes a display phase and a touch phase; During the display phase, the cathode is connected to a common voltage, and the sub-pixel is able to emit light; The touch control stage includes multiple touch control sub-stages. In the multiple touch control sub-stages, the cathodes of the multiple sub-pixel groups are connected to touch signals row by row or column by column, and the sub-pixel groups connected to the touch signals are in a black state. In the touch sub-stage, the signals accessed by the sub-pixel group that receive the touch signal satisfy at least one of the following two conditions: The light emission control signal is at the cutoff level; The voltage difference between the anode and the touch signal connected to the cathode is less than the activation voltage of the light-emitting element.

2. The display panel according to claim 1, characterized in that, In the plurality of touch sub-stages, the cathodes of the plurality of sub-pixel groups are sequentially connected to touch signals; In the touch control sub-stage, the light emission control signal connected to the sub-pixel group that receives the touch signal is at the cutoff level, and the voltage difference between the anode and the touch signal connected to the cathode is greater than or equal to the turn-on voltage of the light-emitting element.

3. The display panel according to claim 1, characterized in that, In the touch control sub-stage, the light emission control signal accessed by the sub-pixel group that receives the touch signal is at the cutoff level, and the sub-pixel group receives the touch signal before receiving the data signal.

4. The display panel according to claim 3, characterized in that, The timing of the cathode of the sub-pixel group receiving the touch signal overlaps at least partially with the timing of the gate of the driving transistor in the sub-pixel group receiving the reset signal.

5. The display panel according to claim 1, characterized in that, The maximum voltage connected to the anode is the first power supply voltage. In the touch sub-stage, for the sub-pixel group connected to the touch signal, the voltage difference between the first power supply voltage and the voltage of the touch signal connected to the cathode is less than the turn-on voltage of the light-emitting element.

6. The display panel according to claim 5, characterized in that, The voltage of the touch signal is greater than the common voltage.

7. The display panel according to claim 1, characterized in that, During the touch phase, each of the sub-pixel groups is in a black state.

8. The display panel according to claim 7, characterized in that, In the touch control sub-stage, the cathode of the sub-pixel group that has not received the touch signal is connected to a reference voltage, and the voltage difference between the anode voltage and the reference voltage connected to the cathode is less than the light-emitting element's activation voltage.

9. The display panel according to claim 8, characterized in that, The voltage of the touch signal is greater than the reference voltage.

10. The display panel according to claim 7, characterized in that, The number of columns in the sub-pixel group is less than the number of rows in the sub-pixel group; In the plurality of touch sub-stages, the cathodes of the plurality of sub-pixel groups are sequentially connected to touch signals.

11. The display panel according to claim 1, characterized in that, In the plurality of touch sub-stages, the cathodes of the plurality of sub-pixel groups are sequentially connected to touch signals; During the touch sub-stage, at least one row of the sub-pixel group that has not received the touch signal can emit light.

12. The display panel according to claim 11, characterized in that, During the touch sub-stage, each row of sub-pixel groups that has not received the touch signal can emit light.

13. The display panel according to claim 12, characterized in that, During the touch sub-stage, the cathodes of the sub-pixel groups in each row that are not connected to the touch signal are connected to the common voltage.

14. The display panel according to claim 11, characterized in that, In the i-th touch sub-stage, the cathode of the sub-pixel group in the i-th row is connected to the touch signal, and the sub-pixel group in the i-th row is in a black state; Furthermore, the sub-pixel group in row j adjacent to the sub-pixel group in row i is in a black state, and the sub-pixel groups in rows other than the sub-pixel group in row i and the sub-pixel group in row j adjacent to it can emit light, where i and j are both integers greater than or equal to 1.

15. The display panel according to claim 14, characterized in that, In the i-th touch sub-stage, the cathode of the j-th row of sub-pixels adjacent to the i-th row of sub-pixels is connected to a reference voltage, and the voltage difference between the anode voltage and the reference voltage connected to the cathode is less than the activation voltage of the light-emitting element.

16. The display panel according to claim 14 or 15, characterized in that, In the i-th touch sub-stage, the cathodes of the sub-pixel groups in the i-th row and the other sub-pixel groups in the adjacent j-th row are connected to the common voltage.

17. The display panel according to claim 1, characterized in that, During the display phase, each of the sub-pixel groups is connected to the same common voltage.

18. The display panel according to claim 1, characterized in that, The display panel includes a first display area and a second display area. During the display phase, the maximum grayscale of the first display area is less than the maximum grayscale of the second display area, and the absolute value of the common voltage connected to the sub-pixel group of the first display area is less than the absolute value of the common voltage connected to the sub-pixel group of the second display area.

19. The display panel according to claim 18, characterized in that, The common voltage connected to the sub-pixel group in the first display area is the saturation voltage with the smallest absolute value. The saturation voltage refers to the common voltage that causes the driving transistor of the pixel circuit to operate in the saturation region.

20. A driving method for a display panel, characterized in that, For driving a display panel, the display panel includes multiple sub-pixel groups arranged in rows and columns, each sub-pixel group including at least one sub-pixel, each sub-pixel including a light-emitting element and a pixel circuit, the light-emitting control signal connected to the pixel circuit is used to control whether the light-emitting element emits light, the light-emitting element including an anode and a cathode, the anode being electrically connected to the pixel circuit, the cathode being reused as a touch electrode, and the cathodes of different sub-pixel groups being insulated from each other; Within one frame, the operation of the display panel includes a display stage and a touch stage, and the touch stage includes multiple touch sub-stages; The driving method includes: During the display phase, a common voltage is provided to the cathode to drive the sub-pixel to emit light; In the plurality of touch sub-stages, touch signals are provided to the cathodes of the plurality of sub-pixel groups row by row or column by column, and the sub-pixel groups that receive the touch signals are controlled to be in a black state; In the touch sub-stage, the signals accessed by the sub-pixel group that receive the touch signal satisfy at least one of the following two conditions: The light emission control signal is at the cutoff level; The voltage difference between the anode and the touch signal connected to the cathode is less than the activation voltage of the light-emitting element.

21. A display device, characterized in that, Includes the display panel as described in any one of claims 1-19.

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