Touch display panel, driving method thereof and display device

Abstract

The invention relates to the technical field of display, and particularly discloses a touch display panel, a driving method thereof and a display device.At least one touch signal line and at least one set of pixel units are formed on a substrate, each pixel unit comprises a light-emitting device and a pixel driving circuit connected with the light-emitting device, and each pixel driving circuit comprises a switch unit; the switch unit is connected between the cathode of the light-emitting device and the touch signal line and is also connected between the cathode of the light-emitting device and a first voltage source, and the switch unit is configured to connect or disconnect the cathode of the light-emitting device and the touch signal line according to a first switch signal; and connecting or disconnecting the cathode of the light-emitting device and the first voltage source according to the second switching signal. According to the touch display panel, the connection relation of the cathodes of the light-emitting devices can be switched through the switch units, the touch signal lines and the pixel cathodes can share signals, and then the technical effect of integration of display and touch functions is achieved.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly to a touch display panel, a driving method thereof, and a display device. Background Art

[0002] Organic Light-Emitting Diode (OLED) display technology has been favored by users due to its many advantages such as wide viewing angles, low power consumption, high contrast ratio, and fast response time. At the same time, the touch function has also become an increasingly indispensable function in display devices. Currently, in Active-matrix organic light-emitting diode (AMOLED) displays, the in-cell technology has gradually attracted market attention because it can make the display module thinner and lighter. In the in-cell technology, how to implement the display integrated touch function is a key technical issue. Summary of the Invention

[0003] Based on this, it is necessary to provide a touch display panel, a driving method thereof, and a display device for the problem of how to implement the display integrated touch function.

[0004] A touch display panel includes a substrate, on which at least one touch signal line and at least one group of pixel units are formed. The pixel unit includes a light-emitting device and a pixel driving circuit connected to the light-emitting device. The pixel driving circuit includes a switching unit, which is connected between the cathode of the light-emitting device and the touch signal line, and is also connected between the cathode of the light-emitting device and a first voltage source. The switching unit is configured to conduct or disconnect the connection between the cathode of the light-emitting device and the touch signal line according to a first switching signal, and conduct or disconnect the connection between the cathode of the light-emitting device and the first voltage source according to a second switching signal.

[0005] In one embodiment, the first switching unit includes a first transistor and a second transistor. The first pole of the first transistor is connected to the cathode of the light-emitting device, the gate of the first transistor is connected to a first switching signal line, and the second pole of the first transistor is connected to the touch signal line; the first pole of the second transistor is connected to the cathode of the light-emitting device, the gate of the second transistor is connected to a second switching signal line, and the second pole of the second transistor is connected to the first voltage source.

[0006] In one embodiment, the pixel driving circuit further includes a driving unit configured to output a light-emitting driving signal; the light-emitting driving signal is used to drive the light-emitting unit; a light-emitting control unit is connected between the driving unit and the anode of the light-emitting device, and the light-emitting control unit is configured to connect or disconnect the connection between the driving unit and the anode of the light-emitting device according to a light-emitting control signal.

[0007] In one embodiment, the light-emitting control unit includes a third transistor. A first pole of the third transistor is connected to the driving unit, a gate of the third transistor is connected to a light-emitting control signal line, and a second pole of the third transistor is connected to the anode of the light-emitting device.

[0008] In one embodiment, the driving unit includes a fourth transistor. A first pole of the fourth transistor is connected to the second voltage source, a gate of the fourth transistor receives a data signal, and a second pole of the fourth transistor is connected to the light-emitting control unit.

[0009] In one embodiment, the touch display panel includes a pixel unit film layer formed on the substrate; a plurality of pixel units are formed in the pixel unit film layer; the pixel unit film layer includes a pixel definition layer and a light-emitting device film layer; the pixel definition layer includes a pixel definition portion and a pixel opening defined by the pixel definition portion, and at least a part of the light-emitting device film layer is located within the pixel opening; at least one light-emitting device is formed in the light-emitting device film layer.

[0010] In one embodiment, the pixel unit film layer further includes an isolation column layer formed on a surface of the pixel definition layer away from the substrate, and a plurality of mutually spaced isolation columns are formed in the isolation column layer; the isolation columns separate at least a part of the light-emitting device film layer.

[0011] In one embodiment, the pixel unit film layer further includes a cathode layer formed on surfaces of the light-emitting device film layer and the isolation column layer away from the substrate, and the isolation columns separate the cathode layer between two adjacent light-emitting devices.

[0012] In one embodiment, a positive projection of the isolation column on the substrate is located between positive projections of two adjacent pixel units on the substrate.

[0013] In one embodiment, a positive projection of a surface of the isolation column away from the substrate on the substrate is a first projection, and a positive projection of a surface of the isolation column close to the substrate on the substrate is a second projection, and the second projection is within the first projection range.

[0014] In one embodiment, the isolation posts are arranged in a grid pattern, and the cathode of the light-emitting device is located in the opening formed by the grid structure.

[0015] In one embodiment, a plurality of the light-emitting devices are disposed in the opening, and the cathodes of the plurality of light-emitting devices are integrated.

[0016] In one embodiment, a touch control metal layer is further included between the substrate and the pixel definition layer, and at least one touch control signal line is formed in the touch control metal layer.

[0017] In one embodiment, the pixel definition layer is provided with signal vias, a positive projection of the signal vias on the substrate at least partially coincides with a positive projection of the touch control signal line on the substrate, and the touch control signal line is in electrical contact with the cathode layer through the signal vias.

[0018] In one embodiment, the cathode layer is multiplexed as the touch control electrode during the touch control stage.

[0019] A driving method for a touch display panel is used to drive the touch display panel according to any one of the above embodiments. The pixel unit includes a first stage and a second stage in a frame display. The method is characterized in that in the first stage, the pixel driving circuit receives a reset signal and a driving signal, and at the same time, during at least part of the time in the first stage, the cathode of the light-emitting device receives a touch control signal; in the second stage, the pixel driving circuit receives a light-emitting signal, and at the same time, the cathode of the light-emitting device receives a first voltage source signal.

[0020] In one embodiment, when the pixel driving circuit receives the reset signal, the cathode of the light-emitting device receives the touch control signal, or when the pixel driving circuit receives the driving signal, the cathode of the light-emitting device receives the touch control signal.

[0021] In one embodiment, the driving signal includes a data writing signal and a compensation signal.

[0022] In one embodiment, a plurality of the light-emitting devices are arranged in an array along the row direction and the column direction of the touch display panel. During at least part of the time in the first stage, the level of the first switch signal is a conducting level, the level of the second switch signal is a cut-off level, and the touch control signal scans the cathodes of the light-emitting devices row by row or column by column; in the second stage, the level of the first switch signal is a cut-off level, the level of the second switch signal is a conducting level, and the first voltage source inputs a first voltage source signal to the cathodes of all the light-emitting devices simultaneously.

[0023] A display device includes the touch display panel described in any of the above embodiments.

[0024] In the above touch display panel, at least one touch signal line and at least one group of pixel units are formed on a substrate. The pixel units include light-emitting devices and pixel driving units. Among them, the pixel driving unit includes a switching unit. The switching unit is connected between the cathode of the light-emitting device and the touch signal line, and is also connected between the cathode of the light-emitting device and a first voltage source. The switching unit can control the conduction or disconnection of the connection between the cathode of the light-emitting device and the touch signal line, and can also control the conduction or disconnection of the connection between the cathode of the light-emitting device and the first voltage source. The above touch display panel can use the switching unit to switch the connection relationship of the cathode of the light-emitting device. When the connection between the cathode of the light-emitting device and the touch signal line is conductive, the touch signal line can share the signal with the pixel cathode, and the touch function can be realized by using the cathode. When the connection between the cathode of the light-emitting device and the first voltage source is conductive, the light-emitting device can emit light normally. It can be seen that the above touch display panel achieves the technical effect of integrating display and touch functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present specification. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic structural diagram for implementing an integrated display and touch function in the prior art;

[0027] Figure 2 It is a schematic structural diagram of the connection between pixel units and touch signal lines in the touch display panel in one embodiment of the present application;

[0028] Figure 3 It is a schematic circuit structural diagram of the connection between pixel units and touch signal lines in the touch display panel in one embodiment of the present application;

[0029] Figure 4 It is a schematic flow diagram of the driving method of the touch display panel in one embodiment of the present application;

[0030] Figure 5 It is a schematic timing diagram of each signal in the touch display panel in one embodiment of the present application;

[0031] Figure 6 It is a schematic timing diagram of each signal in the touch display panel in another embodiment of the present application;

[0032] Figure 7 Schematic cross-sectional view of a partial touch display panel in one embodiment of the present application;

[0033] Figure 8 Schematic diagram of the patterning of the cathode and the connection relationship with the touch signal line in one embodiment of the present application;

[0034] Figure 9 For Figure 8 Partial cross-sectional schematic view of the touch display panel shown taken along the cross-section line A-A';

[0035] Figure 10 Schematic diagram of the patterning of the cathode in one embodiment of the present application. Detailed implementation manners

[0036] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0038] In the case of using "including", "having", and "comprising" described herein, unless an explicit limiting term is used, such as "only", "consisting of", etc., another component can also be added. Unless otherwise mentioned, terms in the singular form can include the plural form and should not be construed as having a quantity of one.

[0039] It should be understood that although terms such as "first" and "second" can be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present application, the first element can be referred to as the second element, and similarly, the second element can be referred to as the first element.

[0040] In this application, unless otherwise clearly specified and defined, terms such as "connected" and "linked" shall be understood in a broad sense. For example, it can be directly connected or indirectly connected through an intermediate medium, and can be the internal connection of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] Incell TP (Incell Touch Panel) refers to a technology that embeds the touch panel function into liquid crystal pixels. Figure 1 It is a schematic structural diagram for implementing the display integrated touch function in the prior art. Figure 1 In the figure, the square pattern is the patterned pixel cathode, and the vertical traces between the pixel cathodes are touch electrodes. In the existing Incell TP technology, as Figure 1 shown, by patterning the pixel cathode, using the cathode position outside the pixel opening area as the patterning boundary, an additional metal is used to prepare the touch electrode TP at the gap position between the divided pixel cathodes to ensure that the touch signal is not covered by the cathode and the signal of the display screen can be detected. However, the TP electrodes are distributed in the gaps between the cathodes, resulting in too small an area of the TP electrodes passing through the cathode, so the intensity of the TP signal cannot be guaranteed.

[0042] This application provides a touch display panel that realizes the display integrated touch function by sharing signals between the TP electrode and the pixel cathode. Sharing signals between the TP electrode and the pixel cathode can expand the area of the TP electrode, thus ensuring the intensity of the TP signal. Figure 2 It is a schematic structural diagram of the connection between the pixel unit and the touch signal line in the touch display panel in one embodiment of this application. In one embodiment, the touch display panel may include a substrate, and at least one touch signal line and at least one group of pixel units 100 may be formed on the substrate.

[0043] The touch signal line can be used to transmit touch signals Tx / Rx and can be used to detect the touch input of the user. An electric field is formed by each touch signal line in the touch display panel. When the user touches the screen, the touch action will interfere with the electric field formed by each touch signal line, thereby generating a measurable signal change. The pixel unit 100 may include sub-pixels of different colors or pixel points that can emit light independently. These sub-pixels or pixel points can be combined to display various colors. The pixel unit 100 controls the brightness and color by receiving signals from the data line and the gate line, thereby forming an image on the screen.

[0044] The pixel unit 100 may include a light-emitting device 200 and a pixel driving circuit 300. The pixel driving circuit 300 is connected to the light-emitting device 200. The pixel driving circuit 300 can be used to output a light-emitting driving signal, and the light-emitting device 200 emits light according to the light-emitting driving signal. By adjusting the light-emitting driving signal output to the light-emitting device 200, the pixel driving circuit 300 can change the light-emitting intensity of the light-emitting device 200 to achieve color and brightness control. In this application, the light-emitting device 200 can be a light-emitting diode, and the pixel driving circuit 300 can be any circuit capable of outputting a light-emitting driving signal, such as 2T1C, 7T1C, 7T2C and other pixel driving circuits.

[0045] The pixel driving circuit 300 may include a switching unit 310. The switching unit 310 can be connected between the cathode of the light-emitting device 200 and the touch signal line, and the switching unit 310 can also be connected between the cathode of the light-emitting device 200 and the first voltage source. The switching unit 310 can be configured to conduct or disconnect the connection between the cathode of the light-emitting device 200 and the touch signal line according to the first switching signal SW1, and the switching unit 310 can also be configured to conduct or disconnect the connection between the cathode of the light-emitting device 200 and the first voltage source according to the second switching signal SW2. In this embodiment, the first voltage source can continuously provide a first voltage source signal VSS, and the first voltage source signal VSS can be a low-level signal.

[0046] The switching unit 310 may include a switching transistor. The conduction or cutoff of the switching transistor is controlled according to the first switching signal SW1 or the second switching signal SW2. Thus, the switching unit 310 can conduct or disconnect the connection between the cathode of the light-emitting device 200 and the touch signal line according to the first switching signal SW1, and the switching unit 310 can conduct or disconnect the connection between the cathode of the light-emitting device 200 and the first voltage source according to the second switching signal SW2.

[0047] In the above touch display panel, the pixel driving circuit 300 can use the switching unit 310 to control the connection relationship between the cathode of the light-emitting device 200 and other circuit elements. When the switching unit 310 conducts the connection between the cathode of the light-emitting device 200 and the touch signal line according to the first switching signal SW1, the cathode of the light-emitting device 200 can be used as a touch electrode TP, and the cathode of the light-emitting device 200 can access the touch signal Tx / Rx to achieve the transmission and detection of the touch signal Tx / Rx. When the cathode of the light-emitting device 200 is used as the touch electrode TP, when a human body or other conductive object approaches or touches the screen, a coupling capacitor will be formed between the cathode of the light-emitting device 200 and the human body or other conductive object, and the coupling capacitor will change the original capacitance value. The touch signal Tx / Rx can scan and collect capacitance signals through the cathode of the light-emitting device 200, and at this time, the touch display panel can achieve the touch function.

[0048] When the switch unit 310 conducts the connection between the cathode of the light-emitting device 200 and the first voltage source according to the second switch signal SW2, the first voltage source can provide the first voltage source signal VSS required for light emission to the light-emitting device 200, so that the light-emitting device 200 can emit light according to the control of the pixel driving circuit 300. At this time, the touch display panel realizes the display function.

[0049] The touch display panel provided by the present application can use the switch unit 310 to control whether the cathode of the light-emitting device 200 is connected to the first voltage source or the touch signal line, so that the cathode of the light-emitting device 200 is connected to the first voltage source signal VSS or the touch signal Tx / Rx, that is, the touch display panel realizes the integration of touch and display functions. At the same time, compared with the prior art in which the touch electrode is designed between the gaps of the pixel cathode and the touch signal needs to pass through the pixel cathode to be transmitted to the touch signal line, in the touch stage of the touch display panel provided by the present application, the cathode of the light-emitting device 200 is connected to the touch signal line, and the cathode of the light-emitting device 200 is used as the touch electrode to realize touch scanning. Therefore, in the present application, the area of the touch electrode is large, which can ensure the intensity of the touch signal.

[0050] Figure 3 It is a schematic circuit structure diagram of the connection between the pixel unit and the touch signal line in the touch display panel in one embodiment of the present application. In one embodiment, the first switch unit 310 may include a first transistor T1 and a second transistor T2.

[0051] In the embodiments of the present disclosure, a transistor refers to an element including at least a gate, a drain, and a source. In the present disclosure, the first pole of the transistor may be the drain, the second pole may be the source, or the first pole may be the source and the second pole may be the drain. In the case of using transistors with opposite polarities or when the current direction changes in the circuit operation, the functions of the "source" and "drain" are sometimes interchanged. In the embodiments of the present disclosure, the gates of all or part of the transistors may serve as the control poles of the transistors, and the first pole and the second pole can be interchanged as needed.

[0052] The first pole of the first transistor T1 may be connected to the cathode of the light-emitting device 200, the gate of the first transistor T1 may be connected to the first switch signal line, and the second pole of the first transistor T1 may be connected to the touch signal line. Specifically, the first transistor T1 receives the first switch signal SW1 transmitted by the first switch signal line through the gate of the first transistor T1. The first switch signal SW1 can be used to control the conduction or cut-off of the first transistor T1, so that the first transistor T1 can conduct or disconnect the connection between the cathode of the light-emitting device 200 and the touch signal line according to the first switch signal SW1.

[0053] When the first transistor T1 conducts the connection between the cathode of the light-emitting device 200 and the touch signal line according to the first switch signal SW1, the touch signal Tx / Rx transmitted on the touch signal line will be transmitted to the cathode of the light-emitting device 200. At this time, the touch display panel uses the cathode of the light-emitting device 200 as the touch electrode TP. As Figure 3 shown, when a human body or other conductive object approaches or touches the screen, a coupling capacitor will be formed between the cathode of the light-emitting device 200 and the human body or other conductive object, and this coupling capacitor will change the original capacitance value. The touch signal Tx / Rx can scan and collect the capacitance signal through the cathode of the light-emitting device 200. At this time, the touch display panel can achieve the touch function.

[0054] The first pole of the second transistor T2 can be connected to the cathode of the light-emitting device 200, the gate of the second transistor T2 can be connected to the second switch signal line, and the second pole of the second transistor T2 can be connected to the first voltage source. Specifically, the second transistor T2 receives the second switch signal SW2 transmitted on the second switch signal line through the gate of the second transistor T2. The second switch signal SW2 can be used to control the conduction or cutoff of the second transistor T2, so that the second transistor T2 can conduct or disconnect the connection between the cathode of the light-emitting device 200 and the first voltage source according to the second switch signal SW2.

[0055] When the second transistor T2 conducts the connection between the cathode of the light-emitting device 200 and the first voltage source according to the second switch signal SW2, the first voltage source can provide the first voltage source signal VSS to the light-emitting device 200. The light-emitting device 200 can emit light normally according to the received light-emitting drive signal. At this time, the touch display panel can achieve the display function.

[0056] In one embodiment, please refer to Figure 3 , the pixel driving circuit 300 may further include a driving unit 320 and a light-emitting control unit 330. The driving unit 320 can be used to output a light-emitting drive signal to the light-emitting device 200. In this embodiment, the light-emitting drive signal can be a drive current.

[0057] The light-emitting control unit 330 can be connected between the driving unit 320 and the anode of the light-emitting device 200. The light-emitting control unit 330 can be configured to conduct or disconnect the connection between the driving unit 320 and the anode of the light-emitting device 200 according to the light-emitting control signal EM. The light-emitting control unit 330 can include a switching transistor, and controls the conduction or cutoff of the switching transistor according to the light-emitting control signal EM, so that the light-emitting control unit 330 can conduct or disconnect the connection between the driving unit 320 and the anode of the light-emitting device 200 according to the light-emitting control signal EM. The light-emitting control unit 330 can conduct or disconnect the connection between the driving unit 320 and the anode of the light-emitting device 200 according to the light-emitting control signal EM.

[0058] In one embodiment, please refer to Figure 3 , the light emission control unit 330 may include a third transistor T3. The first pole of the third transistor T3 may be connected to the driving unit 320, the gate of the third transistor T3 may be connected to the light emission control signal line, and the second pole of the third transistor T3 may be connected to the anode of the light emitting device 200. Specifically, the third transistor T3 receives the light emission control signal EM transmitted by the light emission control signal line through the gate of the third transistor T3, and the light emission control signal EM may be used to control the conduction or cutoff of the third transistor T3. Thus, the third transistor T3 may conduct or disconnect the connection between the driving unit 320 and the anode of the light emitting device 200 according to the light emission control signal EM.

[0059] In one embodiment, please refer to Figure 3 , the driving unit 320 may include a fourth transistor T4. The first pole of the fourth transistor T4 may be connected to the second voltage source, the gate of the fourth transistor T4 may receive the data writing signal, and the second pole of the fourth transistor T4 may be connected to the light emission control unit 330. In this embodiment, the second voltage source may continuously provide the second voltage source signal VDD, and the second voltage source signal VDD may be a high-level signal. Specifically, the fourth transistor T4 may generate a corresponding light emission driving signal according to the data writing signal received at the gate of the fourth transistor T4 to drive the light emitting device 200 to emit light.

[0060] The embodiment of the present invention also provides a driving method for driving the touch display panel described in any one of the above embodiments. Each pixel unit in the touch display panel may include a first stage t1 and a second stage t2 in a frame display. Figure 4 This is a schematic flowchart of the driving method of the touch display panel in one embodiment of the present application. In one embodiment, the driving method may include the following steps S100 to step S200.

[0061] Step S100: In the first stage, the pixel driving circuit receives a reset signal and a driving signal, and at the same time, the cathode of the light emitting device receives a touch signal during at least part of the first stage.

[0062] In the first stage t1, a reset signal and a driving signal are input to the pixel driving circuit 300 of each pixel unit 100 in the touch display panel. The pixel driving circuit 300 may implement functions such as reset, compensation, and data writing according to the reset signal and the driving signal. At the same time, during at least part of the first stage t1, a touch signal Tx / Rx is input to the cathode of the light emitting device 200, and the cathode of the light emitting device 200 is used as a touch electrode TP for touch scanning.

[0063] Step S200: In the second stage, the pixel driving circuit receives a light-emitting signal, and at the same time, the cathode of the light-emitting device receives a first voltage source signal.

[0064] In the second stage t2, a light-emitting signal is input to the pixel driving circuit 300 of each pixel unit 100 in the touch display panel. At the same time, the first voltage source sends a first voltage source signal VSS to the cathode of the light-emitting device 200. The pixel driving circuit 300 can output a light-emitting driving signal to the light-emitting device 200 according to the light-emitting signal, and the light-emitting device 200 can emit light according to the light-emitting driving signal.

[0065] In one embodiment, when a reset signal is sent to the pixel driving circuit 300, a touch signal Tx / Rx is sent to the cathode of the light-emitting device 200 at the same time, or when a driving signal is sent to the pixel driving circuit 300, a touch signal Tx / Rx is sent to the cathode of the light-emitting device 200 at the same time.

[0066] In one embodiment, the driving signal may include a data writing signal and a compensation signal.

[0067] In one embodiment, multiple light-emitting devices 200 may be arranged in an array along the row direction and the column direction of the touch display panel. During at least part of the first stage t1, the level of the first switch signal SW1 may be a conducting level, and the level of the second switch signal SW2 may be a cut-off level. The touch signal Tx / Rx scans the cathodes of the light-emitting devices 200 in the touch display panel row by row or column by column.

[0068] In the second stage t2, the level of the first switch signal SW1 may be a cut-off level, and the level of the second switch signal SW2 may be a conducting level. The first voltage source can simultaneously input a first voltage source signal VSS to the cathodes of all the light-emitting devices 200 in the touch display panel.

[0069] In a preferred embodiment, the touch display panel may include n pixel units 100, where n is a positive integer, and each group of pixel units 100 correspondingly includes a group of pixel driving circuits 300. The first stage t1 may include n non-overlapping first sub-stages. During the entire first stage t1, the level of the first switching signal in the n pixel units 100 may be controlled to be the conductive level, the level of the second switching signal in the n pixel units 100 may be controlled to be the cut-off level, and the level of the light-emitting signal in the n pixel units 100 may be controlled to be the cut-off level; wherein, during the i-th first sub-stage, the levels of the reset signal and the compensation signal in the i-th pixel unit 100 are controlled to be the conductive level, and a data writing signal is input to the i-th pixel unit 100. At the same time, the levels of the reset signal and the compensation signal in the other pixel units 100 of the touch display panel are controlled to be the cut-off level, and the touch signal in the i-th pixel unit is controlled to perform signal scanning, i = 1, 2, 3,.., n.

[0070] In practical applications, appropriate levels can be selected as the conductive level and the cut-off level of each transistor according to the types of the transistors in the pixel driving circuit 300. In this embodiment, taking Figure 3 the pixel driving circuit 300 shown as an example and combining Figure 5 with the timing schematic diagram shown, the driving method will be described. Figure 3 In the figure, each transistor is a P-type transistor. Therefore, in this embodiment, the conductive level may be a low level, and the cut-off level may be a high level.

[0071] Figure 5 This is the timing schematic diagram of each signal in the touch display panel in one embodiment of the present application. It can be implemented according to the Figure 5 signal timing shown to drive the Figure 3 touch display panel shown. Figure 5 In the figure, S1, S2 to Sn-1, Sn may respectively represent the reset signals input to the n groups of pixel driving circuits 300, Tx1 / Rx1 to Txn / Rxn may respectively represent the touch signals input to the n groups of pixel driving circuits 300, SW1 may represent the first switching signal, SW2 may represent the second switching signal, EM may represent the light-emitting signal, t1 may represent the first stage, and t2 may represent the second stage.

[0072] In addition, the signal waveforms of the n compensation signals input to the n groups of pixel driving circuits 300 may be the same as the signal waveforms of the n reset signals input to the n groups of pixel driving circuits 300 in Figure 5 . The n data writing signals input to the n groups of pixel driving circuits 300 are not shown in Figure 5 . In practical applications, the waveform design can be carried out according to specific display requirements.

[0073] In this embodiment, when the touch display panel operates in the first stage t1, not only can the touch function be realized, but also operations such as resetting, compensating, and data writing of the pixel driving circuit 300 can be realized. In the first stage t1, the electrical levels of the first switch signals SW1 in the n pixel units 100 can be controlled to be conductive levels, and the electrical levels of the second switch signals SW2 in the n pixel units 100 can be controlled to be cut-off levels, so as to control the first transistors T1 in the n pixel units 100 to be all conductive and the second transistors T2 in the n pixel units 100 to be all cut off. At this time, the connections between the cathodes of the light-emitting devices 200 in the n pixel units 100 and the touch signal lines are all conductive, and the connections between the cathodes of the light-emitting devices 200 in the n pixel units 100 and the first voltage source are all disconnected. When the cathode of the light-emitting device 200 is connected to the touch signal line, the cathode of the light-emitting device 200 can be used as the touch electrode TP, and the cathode of the light-emitting device 200 is connected to the touch signal Tx / Rx.

[0074] In the first stage t1, the electrical level of the light-emitting signal EM in the n pixel units 100 can also be controlled to be a cut-off level. When the electrical level of the light-emitting signal EM in the n pixel units 100 is a cut-off level, the third transistors T3 in the pixel driving circuits 300 in the n pixel units 100 are all cut off.

[0075] Meanwhile, the first stage t1 can include n non-overlapping first sub-stages, and n reset signals, n compensation signals, and n data writing signals are sequentially input into the first group of pixel driving circuits 300, the second group of pixel driving circuits 300, the (n - 1)th group of pixel driving circuits 300 to the nth group of pixel driving circuits 300 row by row or column by column in the n first sub-stages. That is, in the i-th first sub-stage, the electrical levels of the i-th (i = 1, 2, 3,.., n) reset signal Si and the compensation signal are controlled to be conductive levels, and the electrical levels of the other reset signals and compensation signals except the i-th reset signal Si and the compensation signal are controlled to be cut-off levels, so that the reset compensation signal Si can realize the reset and compensation of the i-th group of pixel driving circuits 300. Meanwhile, in the i-th first sub-stage, a data writing signal is input into the i-th pixel driving circuit 300, and it is controlled that no data writing signal is input into the other pixel driving circuits except the i-th pixel driving circuit 300. Thus, in the n first sub-stages of the first stage t1, from the first row or the first column of pixel driving circuits 300 to the last row or the last column of pixel driving circuits 300, the resetting, compensation, and data writing of the n groups of pixel driving circuits 300 are sequentially realized.

[0076] Meanwhile, in the n first sub-stages, the touch signals Tx1 / Rx1 to Txn / Rxn are also sequentially input row by row to the cathodes of the light-emitting devices 200 connected to the first group of pixel driving circuits 300 to the cathodes of the light-emitting devices 200 connected to the nth group of pixel driving circuits 300. In the ith first sub-stage, the touch signal Txi / Rxi in the ith pixel unit 100 is controlled to perform signal scanning, and the touch signals in the pixel units 100 other than the ith pixel unit 100 are controlled not to perform signal scanning. That is, in the n first sub-stages of the first stage t1, the n touch signals Tx1 / Rx1 to Txn / Rxn sequentially perform signal scanning on the n pixel units 100 one by one. By using the cathodes of the light-emitting devices 200 in the n pixel units 100 as touch electrodes, capacitance signals are scanned and collected by using the cathodes of the light-emitting devices 200 in the n pixel units 100. At this time, the touch display panel can implement the touch function.

[0077] In a preferred embodiment, when the touch display panel operates in the second stage t2, the function of light-emitting display can be achieved. In the second stage t2, it can be controlled that the electrical levels of the first switch signals SW1 in the n pixel units 100 are all cut-off levels, and the electrical levels of the second switch signals SW2 in the n pixel units 100 are all conduction levels, so as to control the first transistors T1 in the n pixel units 100 to be cut off and the second transistors T2 in the n pixel units 100 to be turned on. At this time, the connections between the cathodes of the light-emitting devices 200 in each pixel unit 100 and the touch signal lines are all disconnected, and the connections between the cathodes of the light-emitting devices 200 in each pixel unit 100 and the first voltage source are all turned on. When the cathode of the light-emitting device 200 is connected to the first voltage source, the first voltage source can provide the first voltage source signal VSS required for light emission to the light-emitting device 200. Meanwhile, it can also be controlled that the electrical levels of the reset signals and compensation signals in the n pixel units 100 are cut-off levels, control the data write signals to stop being input to the n pixel driving circuits 300, and control the scanning signals in the n pixel units 100 to stop scanning the pixel units 100.

[0078] In the second stage t2, it is also possible to control the average level of the light-emitting signal EM in the n pixel units 100 to be the conduction level. When the level of the light-emitting signal EM in each pixel unit 100 is at the conduction level, the third transistors T3 in each pixel driving circuit 300 are all turned on, so that the connection between the fourth transistor T4 and the anode of the light-emitting device 200 is turned on. Since the reset and compensation of all the pixel driving circuits 300 and the writing of the data signal have been completed in the first stage t1, in the second stage t2, the fourth transistors M4 in all the pixel driving circuits 300 can output a light-emitting driving signal according to the signal at the gate of the fourth transistor M4, and transmit the light-emitting driving signal to the light-emitting device 200. At the same time, the first voltage source provides the first voltage source signal VSS required for light emission to the light-emitting device 200. Therefore, the light-emitting devices 200 can all emit light with corresponding brightness according to the light-emitting driving signal. In the second stage t2, the n pixel units 100 can all achieve light-emitting display.

[0079] In one embodiment, in the first stage t1, the reset of the pixel driving circuit 300 and the compensation of the pixel driving circuit 300 can be separated and carried out in different time periods. In the case where the reset and compensation of the pixel driving circuit 300 are separated, the first stage t1 can include a third stage t3 and a fourth stage t4.

[0080] In this embodiment, taking Figure 3 the pixel driving circuit 300 shown as an example and combining Figure 6 the timing diagram shown, the driving method will be described. Figure 6 This is a timing diagram of each signal in the touch display panel in another embodiment of the present application, and the driving of the Figure 6 touch display panel shown can be realized according to the Figure 3 signal timing shown. Figure 6 In Figure 6 , Reset can represent a reset signal, S1, S2 to Sn-1, Sn can respectively represent compensation signals input to n groups of pixel driving circuits 300, Tx1 / Rx1 to Txn / Rxn can respectively represent touch signals input to n groups of pixel driving circuits 300, SW1 can represent a first switch signal, SW2 can represent a second switch signal, EM can represent a light-emitting signal, t3 can represent a third stage, t4 can represent a fourth stage, and t2 can represent a light-emitting stage. Among them, the fourth stage t4 can include n non-overlapping second sub-stages.

[0081] In the third stage t3, control the level of the first switch signal SW1 in the n pixel units 100 to the cut-off level, control the level of the second switch signal SW2 in the n pixel units 100 to the conducting level, control the level of the reset signal Reset in the n pixel units 100 to the conducting level, control the level of the emission signal EM in the n pixel units 100 to the cut-off level, and control the level of the compensation signal in the n pixel units 100 to the cut-off level.

[0082] In this embodiment, when the touch display panel operates in the third stage t3, the reset of the devices in the pixel driving circuit 300 can be achieved. In the third stage t3, by controlling the levels of the first switch signal SW1 in the n pixel units 100 to be all at the cut-off level and the levels of the second switch signal SW2 in the n pixel units 100 to be all at the conducting level, it is possible to control all the first transistors T1 in the n pixel units 100 to be cut off and all the second transistors T2 in the n pixel units 100 to be conducting. At this time, the connections between the cathodes of the light-emitting devices 200 in the n pixel units 100 and the touch signal lines are all disconnected, and the connections between the cathodes of the light-emitting devices 200 in the n pixel units 100 and the first voltage source are all conducting. When the cathode of the light-emitting device 200 is connected to the first voltage source, the first voltage source can provide the first voltage source signal VSS required for light emission to the light-emitting device 200.

[0083] In the third stage t3, it is also possible to control the levels of the emission signals EM in the n pixel units 100 to be all at the cut-off level. When the levels of the emission signals EM in the n pixel units 100 are all at the cut-off level, the third transistors T3 in the n pixel driving circuits 300 are cut off. In the third stage t3, control the levels of the reset signals Reset connected to the n pixel units 100 to be all at the conducting level. Different from the reset of the pixel driving circuit 300 row by row or column by column in the n first sub-stages of the first stage t1 in the previous embodiment, in the third stage t3 of this embodiment, all the pixel driving circuits 300 in the touch display panel can be reset simultaneously according to the conducting level of the reset signal Reset.

[0084] In the fourth stage t4, control the level of the first switch signal SW1 in the n pixel units 100 to the conducting level, control the level of the second switch signal SW2 in the n pixel units 100 to the cut-off level, control the level of the emission signal EM in the n pixel units 100 to the cut-off level, and control the level of the reset signal Reset in the n pixel units 100 to the cut-off level; wherein, in the i-th second sub-stage, control the level of the compensation signal Si in the i-th pixel unit 100 to the conducting level, control the levels of the compensation signals in the other pixel units 100 to the cut-off level, and control the touch signal Txi / Rxi in the i-th pixel unit 100 to perform signal scanning, i = 1, 2, 3,.., n.

[0085] In the fourth stage t4, by controlling the electrical levels of the first switch signal SW1 in the n pixel units 100 to be conductive levels and the electrical levels of the second switch signal SW2 in the n pixel units 100 to be cut-off levels, it is possible to control the first transistors T1 in the n pixel units 100 to be all turned on and the second transistors T2 in the n pixel units to be all turned off. At this time, the connections between the cathodes of the light-emitting devices 200 in the n pixel units 100 and the touch signal lines are all conductive, and the connections between the cathodes of the light-emitting devices 200 in the n pixel units 100 and the first voltage source are all disconnected. When the cathode of the light-emitting device 200 is connected to the touch signal line, the cathode of the light-emitting device 200 can be used as the touch electrode TP, and the cathode of the light-emitting device 200 accesses the touch signal Tx / Rx.

[0086] In the fourth stage t4, it is also possible to control the electrical level of the light-emitting signal EM in the n pixel units 100 to be a cut-off level. When the electrical levels of the light-emitting signals EM in the n pixel units 100 are all cut-off levels, the third transistors T3 in the n pixel driving circuits 300 are cut off. In the n second sub-stages of the fourth stage t4, the compensation signals S1, S2, Sn-1 to Sn can sequentially perform row-by-row compensation or column-by-column compensation on the n groups of pixel driving circuits 300, from the first row or the first column of pixel driving circuits 300 to the last row or the last column of pixel driving circuits 300. In the i-th second sub-stage, control the electrical level of the compensation signal Si in the i-th pixel unit 100 to be a conductive level, and control the electrical level of the compensation signal Si in the other pixel units 100 except the i-th pixel unit 100 to be a cut-off level, that is, in the i-th second sub-stage, compensation for the pixel driving circuit 300 in the i-th pixel unit 100 is achieved.

[0087] At the same time, in the i-th second sub-stage, control the touch signal Txi / Rxi in the i-th pixel unit 100 to perform signal scanning, and control the touch signal stop signal scanning in the other pixel units 100 except the i-th pixel unit 100. That is, in the n second sub-stages of the fourth stage t4, the touch signals Tx1 / Rx1 to Txn / Rxn are also sequentially input row-by-row or column-by-column to the cathodes of the light-emitting devices 200 connected to the first group of pixel driving circuits 300 to the cathodes of the light-emitting devices 200 connected to the nth group of pixel driving circuits 300. The touch signals Tx1 / Rx1 to Txn / Rxn perform one-by-one signal scanning, and the capacitance signals are scanned and collected through the cathodes of the light-emitting devices 200. At this time, the touch display panel can achieve the touch function.

[0088] In this embodiment, the control method of the second stage t2 is the same as the control method of the second stage t2 in the above embodiment, and will not be elaborated here.

[0089] Figure 7Schematic cross-sectional view of a partial touch display panel in one embodiment of the present application. In one embodiment, the touch display panel may include a substrate 10 and a pixel unit film layer formed on the substrate 10. The pixel unit film layer may include a pixel definition layer 50 and a light-emitting device film layer 20. At least one light-emitting device 200 may be formed in the light-emitting device film layer 20. The pixel definition layer PDL (Pixel Define Layer) may be used to define and isolate the regions of each sub-pixel (such as red, green, and blue), ensuring accurate and pure color display on the screen. The pixel definition layer 50 may include a pixel definition portion and a pixel opening defined by the pixel definition portion. At least a portion of the light-emitting device film layer is located within the pixel opening.

[0090] The present application may further provide a method for manufacturing a touch display panel. The manufacturing method may be used to manufacture the touch display panel described in any of the above embodiments. In one embodiment, the manufacturing method may include the following steps.

[0091] Provide a substrate.

[0092] Form a pixel unit film layer on the substrate. A plurality of pixel units are formed in the pixel unit film layer. The pixel unit film layer includes a pixel definition layer and a light-emitting device film layer. The pixel definition layer includes a pixel definition portion and a pixel opening defined by the pixel definition portion. At least a portion of the light-emitting device film layer is located within the pixel opening. At least one light-emitting device is formed in the light-emitting device film layer.

[0093] Furthermore, the pixel unit film layer may further include a pixel driving film layer (not shown in the figure). At least one pixel driving circuit 300 may be formed in the pixel driving film layer. At least one light-emitting device 200 may be formed in the light-emitting device film layer 20. Among them, the pixel driving circuit 300 may include a switching unit 310. The switching unit 310 may be connected between the cathode of the light-emitting device 200 and the touch signal line 40. The switching unit 310 may also be connected between the cathode of the light-emitting device 200 and the first voltage source. The switching unit 310 may be configured to conduct or disconnect the connection between the cathode of the light-emitting device 200 and the touch signal line 40 according to the first switching signal SW1. The switching unit 310 may also conduct or disconnect the connection between the cathode of the light-emitting device 200 and the first voltage source according to the second switching signal SW2.

[0094] Please refer to Figure 7, in one embodiment, the pixel unit film layer may further include an isolation pillar layer, and the isolation pillar layer may be formed on the surface of the pixel definition layer 50 away from the substrate 10. A plurality of isolation pillars SPC (Spacer Column) spaced from each other may be formed in the isolation pillar layer, and the isolation pillars 30 may penetrate the light-emitting device film layer 20, and at least a part of the isolation pillars 30 extends in a direction away from the substrate 10. That is, the isolation pillars 30 can isolate at least a part of the film layer of the light-emitting device film layer 20. The distances between the respective isolation pillars 30 on the touch display panel may be the same or different. The isolation pillars 30 can be used to play a supporting role to ensure the precise spacing between the pixel units 100.

[0095] As Figure 7 shown, the isolation pillars 30 penetrate the light-emitting device film layer 20 and are higher than the surface of the light-emitting device film layer 20. That is, the height of the isolation pillars 30 in the thickness direction of the touch display panel is greater than the height of the light-emitting device film layer 20 in the thickness direction of the touch display panel. Preferably, the height difference between the isolation pillars 30 and the light-emitting device film layer 20 in the thickness direction of the touch display panel can ensure that the cathode layer 21 covering the surface of the isolation pillars 30 and the cathode layer 21 covering the surface of the light-emitting device film layer 20 are not in electrical contact.

[0096] In a preferred embodiment, the projection of the surface of the isolation pillar 30 on the side away from the substrate 10 on the substrate 10 is the first projection, and the projection of the surface of the isolation pillar 30 on the side close to the substrate 10 on the substrate 10 is the second projection, and the second projection is within the range of the first projection. That is, the cross-sectional area of the isolation pillar 30 on the side away from the substrate 10 is greater than or equal to the cross-sectional area of the isolation pillar 30 on the side close to the substrate 10.

[0097] Figure 7 shows an isolation pillar 30 with an under cut structure. The under cut structure means that there is a section of depression or cutting inward at the bottom edge of the isolation pillar 30. The isolation pillar 30 with the under cut structure can help to better fix the sealant, prevent the sealant from flowing laterally during the curing process, thereby enhancing the sealing effect of the panel edge, preventing the leakage of liquid crystal materials and the entry of external pollutants. In addition, by precisely controlling the depth and width of the under cut in the preparation process flow, it is possible to avoid unnecessary deformation of the liquid crystal layer (Cell Gap) caused by the isolation pillar 30 during the application of pressure or heat treatment, and ensure the height consistency of the liquid crystal layer of each pixel.

[0098] In one embodiment, the pixel unit film layer may further include a cathode layer 21, and the cathode layer 21 may be formed on the surface of the light-emitting device film layer 20 away from the substrate 10. As Figure 7As shown, since the isolation posts 30 penetrate through the light-emitting device film layer 20 and the isolation posts 30 are higher than the light-emitting device film layer 20, the part of the cathode layer 21 covering the surface of the isolation posts 30 is isolated from the other part covering the surface of the light-emitting device film layer 20. The isolation posts 30 isolate the electrical contact between the cathode layers 21 in two adjacent pixel units 100, so that the cathode layers 21 between two adjacent pixel units 100 can be independent of each other through the isolation posts 30, and the isolation posts 30 disconnect the cathode layers 21 between two adjacent pixel units 100.

[0099] In a preferred embodiment, the orthographic projection of the isolation posts 30 on the substrate 10 may be located between the orthographic projections of two adjacent pixel units 100 on the substrate 10 to ensure that the cathode layers 21 between two adjacent light-emitting devices 200 can be independent of each other through the isolation posts 30.

[0100] In one embodiment, the multiple isolation posts 30 of the isolation post layer are arranged in a grid pattern in the touch display panel, and the cathodes of the light-emitting devices 200 are located in the openings formed by the grid pattern.

[0101] In one embodiment, multiple light-emitting devices 200 are arranged in the opening, and the cathodes of the multiple light-emitting devices 200 are an integral body. Specifically, in the preparation process stage of the touch display panel, the cathode layer 21 can be patterned through the isolation posts 30 to form individual cathode patterns. Figure 8 This is a schematic diagram of the patterning of the cathode and its connection relationship with the touch signal line in one embodiment of the present application. Figure 8 shows a partial cathode array in the touch display panel. Nine regular square patterns of the same size respectively correspond to the patterns of the cathode layers 21 of nine pixel units 100. Among them, the gaps between the individual cathode patterns correspond to the isolation posts 30. That is, the isolation posts 30 are arranged to form a grid pattern as shown in Figure 8 Each opening formed by the grid pattern corresponds to a cathode pattern of a light-emitting device 200. The cathode layers 21 between two adjacent pixel units 100 are independent of each other through the isolation posts 30, realizing the patterning of the cathode.

[0102] In one embodiment, a touch metal layer may further be included between the substrate 10 and the pixel defining layer 50. The touch metal layer is formed between the substrate 10 and the pixel defining layer 50. At least one touch signal line 40 may be formed in the touch metal layer, and the touch signal line 40 may be a vertical metal trace as shown in Figure 8

[0103] ​In one embodiment, the pixel defining layer 50 may be provided with signal vias 51. The orthographic projection of the signal vias 51 on the substrate 10 may have at least a partially overlapping area with the orthographic projection of the touch signal lines 40 on the substrate 10. In this embodiment, by providing the signal vias 51 in the pixel defining layer 50 between the touch signal lines 40 and the cathode layer 21 of the light-emitting device 200, the touch signal lines 40 and the cathode layer 21 of the light-emitting device 200 can achieve electrical contact through the signal vias 51. As Figure 8 In a specific embodiment shown, the touch signal lines 40 are exposed through the signal vias 51, and at least a part of the cathode layer 21 is formed at the positions of the signal vias 51, that is, the film layer of at least a part of the cathode layer 21 is formed above at least a part of the positions of the touch signal lines 40, so that the touch signal lines 40 and at least a part of the cathode layer 21 achieve direct electrical contact.

[0104] In one embodiment, the method for manufacturing a touch display panel may further include the following steps.

[0105] Provide a substrate.

[0106] Form a touch metal layer on the substrate, and at least one touch signal line is formed in the touch metal layer.

[0107] Form a pixel defining layer on the surface of the touch metal layer away from the substrate.

[0108] Form a light-emitting device film layer on the surface of the pixel defining layer away from the substrate, and at least one light-emitting device is formed in the light-emitting device film layer.

[0109] Form an isolation column layer on the surface of the pixel defining layer away from the substrate. A plurality of isolation columns spaced from each other are formed in the isolation column layer. The isolation columns separate at least a part of the film layer of the light-emitting device film layer. The orthographic projection of the isolation columns on the substrate is located between the orthographic projections of adjacent two pixel units on the substrate.

[0110] Open signal vias in the pixel defining layer and the light-emitting device film layer. The orthographic projection of the signal vias on the substrate has at least a partially overlapping area with the orthographic projection of the touch signal lines on the substrate.

[0111] Form a cathode layer on the surface of the light-emitting device film layer away from the substrate. The isolation columns separate the cathode layer between adjacent two pixel units.

[0112] Figure 9 For Figure 8 FIG. is a partial cross-sectional schematic view of the touch display panel taken along the section line A-A'. In this embodiment, the manufacturing process of the touch display panel is described with reference to the cross-sectional schematic view shown in Figure 9 However, it should not be construed as a limitation to the scope of the invention patent.

[0113] Specifically, in the array preparation process stage, a touch metal layer can be formed on the surface of the substrate 10. At least one touch signal line 40 can be formed in the touch metal layer. The touch signal line 40 can be a vertical metal trace as shown in Figure 8 . After forming at least one touch signal line 40 in the touch metal layer, a pixel definition layer 50 can be formed on the surface of the touch metal layer away from the substrate 10. The pixel definition part of the pixel definition layer 50 is used to define the pixel opening, so as to define and isolate the regions of each sub-pixel in the touch display panel.

[0114] After forming the pixel definition layer 50, a light-emitting device film layer 20 can be formed by evaporation on the surface of the pixel definition layer 50 away from the substrate 10. At least part of the light-emitting device film layer 20 can be formed at the pixel opening position of the pixel definition layer 50. After forming the light-emitting device film layer 20 by evaporation, an isolation column layer can be formed on the surface of the pixel definition layer 50 away from the substrate 10. A plurality of isolation columns 30 spaced from each other can be formed in the isolation column layer. The isolation columns 30 can penetrate the light-emitting device film layer, and at least part of the isolation columns 30 extend in the direction away from the substrate, so that at least part of the film layer of the light-emitting device film layer 21 can be separated by the isolation columns 30. As shown in Figure 9 , the isolation columns 30 penetrate the light-emitting device film layer 20 and are higher than the surface of the light-emitting device film layer 20. That is, the height of the isolation columns 30 in the thickness direction of the touch display panel is greater than the height of the light-emitting device film layer 20 in the thickness direction of the touch display panel. Among them, the arrangement mode of the isolation columns 30 in the isolation column layer will affect the result of the cathode patterning. Therefore, the arrangement mode of the isolation columns 30 in the isolation column layer can be determined according to the design structure of the cathode patterning. Preferably, the orthographic projection of the isolation columns 30 on the substrate 10 can be located between the orthographic projections of two adjacent pixel units 100 on the substrate 10.

[0115] Preferably, before evaporating the cathode layer 21, a signal via 51 can be opened at the position of the pixel definition layer 50 corresponding to the touch signal line 40. The signal via 51 can be used to expose at least part of the touch signal line 40. Specifically, the signal via 51 can be opened on the pixel definition layer 50 by laser drilling. Laser drilling uses a highly focused laser beam to quickly and precisely drill tiny holes on the pixel definition layer 50 to form the signal via 51. Preferably, at least part of the orthographic projection of the signal via 51 on the substrate 10 coincides with the orthographic projection of the touch signal line 40 on the substrate 10 to achieve the technical effect of exposing at least part of the touch signal line 40.

[0116] After opening the signal vias 51, the cathode layer 21 is continuously vapor-deposited to form the cathode layer 21 on the surface of the light-emitting device film layer 20 away from the substrate 10. The cathode layers 21 between adjacent two pixel units 100 are independent of each other through the isolation posts 30. The touch signal lines 40 and the cathode layer 21 are in electrical contact through the signal vias 51. The cathode layer 21 is segmented and patterned by the isolation posts 30 to form individual cathode patterns. That is, the cathode layers 21 between different pixel units 100 in the touch display panel are patterned through the under cut structure of the isolation posts 30 to form independent cathode patterns in different pixel units 100. Specifically, it can be combined with Figure 8 and Figure 9 , and the isolation posts 30 are used to achieve the graphic segmentation of the cathode.

[0117] Since the pixel definition layer 50 opens the signal vias 51 at the corresponding positions of the touch signal lines 40 before vapor-depositing the cathode layer 21, at least part of the touch signal lines 40 are exposed. Therefore, the cathode layer 21 segmented and patterned by the isolation posts 30 can also be in electrical contact with the exposed touch signal lines 40 through the signal vias 51. After the cathode layer 21 is in electrical contact with the exposed touch signal lines 40 through the signal vias 51, each individual cathode pattern can be used as a touch electrode TP, and the touch signal Tx / Rx is connected by the cathode pattern during the touch stage of the touch display panel (wherein, the touch stage can be the first stage t1 or the fourth stage t4 in the above embodiments) to achieve the touch function.

[0118] In this embodiment, in the touch display panel with the above structure, the routing transmission of the touch signals Tx / Rx in the touch display panel is realized through the touch signal lines 40. The cathode layer 21 is segmented into individual cathode patterns by the isolation posts 30, and each individual cathode pattern can be correspondingly connected to the touch signal lines 40 through the signal vias 51. During the touch stage, the touch signal lines 40 can transmit the touch signals Tx / Rx to the cathode of the light-emitting device 200, and the cathode pattern can also be used as the touch electrode TP to achieve the touch function. The touch display panel provided by the present application can achieve the technical effect of driving the cathode pattern for touch. Since the cathode pattern is used for touch, the electrode area for realizing the touch function is large, so the signal intensity of the touch signals Tx / Rx is stronger. Using the regular cathode pattern as shown in Figure 8 , it can ensure that the signal intensities of the touch signals Tx / Rx in each pixel unit 100 are equivalent. At the same time, the touch signal lines 40 arranged in the lower layer have a small resistance. Therefore, when the touch signal lines 40 realize the routing transmission of the touch signals Tx / Rx, the delay of the touch signals Tx / Rx is smaller and the signal is more sensitive.

[0119] The present application also provides another structure of a touch display panel, which can also achieve the purpose of integrating touch and display functions. In this embodiment, the structure of the touch display panel is as Figure 7 shown. In one embodiment, the cathode of the light-emitting device 200 can be multiplexed as a touch electrode TP during the touch stage (where the touch stage can be the first stage t1 or the fourth stage t4 in the above embodiment).

[0120] Specifically, when the touch display panel operates in the touch stage, the cathode of the light-emitting device 200 in the pixel unit 100 can access the touch signal Tx / Rx, and the cathode pattern of the pixel unit 100 is used as the touch electrode TP to achieve the touch function. Using the cathode pattern as the touch electrode TP can achieve a large area of the touch electrode TP, thereby achieving the technical effect of stronger signal intensity of the touch signal Tx / Rx. When the touch pixel unit 100 operates in the light-emitting stage t2, the cathode layer 21 can be used as the cathode of the light-emitting device 200 to achieve the light-emitting display function.

[0121] Figure 10 It is a schematic diagram of the patterning of the cathode in one embodiment of the present application. Similarly, in the manufacturing process stage of the touch display panel, the cathode layer 21 can also be patterned through the isolation columns 30 to form individual cathode patterns. The difference is that by preparing the cathode patterns in the touch display panel as Figure 10 shown, the cathode patterns are independent of each other, and the cathode patterns extend in the vertical direction, realizing the wiring extension of the cathode patterns of each pixel unit 100 on the touch display panel. It can be seen that by using the touch display panel combining the structures shown in Figure 7 and Figure 10 , by multiplexing the cathode layer 21 as the touch electrode TP during the touch stage, it is not necessary to separately prepare the touch signal line 40, nor to open the signal vias 51 to connect the cathode layer 21 and the touch signal line 40. On the basis of realizing the integration of touch and display functions, the manufacturing process of the touch display panel with this structure can be greatly saved, and at the same time, the manufacturing cost of the touch display panel with this structure can be reduced.

[0122] In one embodiment, when manufacturing the touch display panel with the structures shown in Figure 7 and Figure 10 , the following steps can be included when manufacturing the array display panel.

[0123] Provide a substrate.

[0124] Form a pixel definition layer on the substrate.

[0125] Form a light-emitting device film layer on the surface of the pixel definition layer away from the substrate, and at least one light-emitting device is formed in the light-emitting device film layer.

[0126] An isolation pillar layer is formed on the surface of the pixel definition layer away from the substrate. A plurality of isolation pillars spaced from each other are formed in the isolation pillar layer. The isolation pillars separate at least part of the light-emitting device film layer, and the orthographic projection of the isolation pillars on the substrate is located between the orthographic projections of two adjacent pixel units on the substrate.

[0127] A cathode layer is formed on the surface of the light-emitting device film layer away from the substrate. The isolation pillars separate the cathode layer between two adjacent pixel units.

[0128] Specifically, in the array preparation process stage, a pixel definition layer 50 can be formed on the substrate 10. The pixel definition part of the pixel definition layer 50 is used to define the pixel opening, so as to define and isolate the regions of each sub-pixel in the touch display panel. A light-emitting device film layer 20 is formed by evaporation on the surface of the pixel definition layer 50 away from the substrate. At least part of the light-emitting device film layer 20 can be formed at the pixel opening position of the pixel definition layer 50. After the light-emitting device film layer 20 is formed, an isolation pillar layer can be formed on the surface of the pixel definition layer 50 away from the substrate. A plurality of isolation pillars 30 spaced from each other can be formed in the isolation pillar layer. The isolation pillars 30 penetrate through the light-emitting device film layer 20, and at least part of the isolation pillars 30 extend in the direction away from the substrate 10. The isolation pillars can separate at least part of the light-emitting device film layer 20. The height of the isolation pillars 30 in the thickness direction of the touch display panel is greater than the height of the light-emitting device film layer 20 in the thickness direction of the touch display panel. Among them, the arrangement mode of the isolation pillars 30 in the isolation pillar layer will affect the result of cathode patterning. Therefore, the arrangement mode of the isolation pillars 30 in the isolation pillar layer can be determined according to the design structure of the cathode patterning. Preferably, the orthographic projection of the isolation pillars 30 on the substrate 10 can be located between the orthographic projections of two adjacent pixel units 100 on the substrate 10. A light-emitting device film layer 20 is formed on the surface of the isolation pillar layer away from the pixel definition layer 50.

[0129] A cathode layer is formed on the surface of the light-emitting device film layer 20 away from the substrate 10. The cathode layers between two adjacent pixel units 100 are independent of each other through the isolation pillars 30. The isolation pillars 30 separate the cathode layer 21 between two adjacent pixel units 100. Since a plurality of isolation pillars 30 have been arranged in the isolation pillar layer according to the design scheme of the cathode patterning, the isolation pillars 30 can realize the patterned segmentation of the cathode layer 21 and can form as Figure 10The graphical cathode array shown. In this embodiment, the cathode layer 21 in each pixel unit 100 can be reused as a touch electrode TP during the touch stage. At the same time, according to the extended arrangement of the cathode patterns in each pixel unit 100 in the array display panel, the touch signals Tx / Rx can be transmitted on the touch display panel. That is, the cathode patterns of each pixel unit 100 in the cathode layer 21 can replace the touch signal lines to transmit the touch signals Tx / Rx on the array display panel.

[0130] An embodiment of the present invention further provides a display device, which includes the touch display panel described in any one of the above embodiments, and the touch display panel can implement the function of integrated display and touch. The display device can be applied to any product or component with a display function, including but not limited to the following categories: mobile phones, televisions, digital cameras, tablet computers, laptop computers, desktop monitors, smart bracelets, smart glasses, vehicle-mounted displays, medical devices, industrial control devices, touch interaction terminals, etc. The embodiments of the present invention do not make special limitations on this.

[0131] It should be understood that although the steps in the flowchart of the accompanying drawings of the specification are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, there is no strict order limit for the execution of these steps, and these steps can be executed in other orders. Moreover, at least some of the steps in the flowchart of the accompanying drawings of the specification may include multiple steps or multiple stages. These steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least a part of other steps or steps or stages in other steps.

[0132] In the description of this specification, the descriptions referring to terms such as "some embodiments", "other embodiments", "ideal embodiments", etc. mean that the specific features, structures, materials or features described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0133] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0134] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A touch display panel, characterized in that: The invention comprises a substrate, on which at least one touch signal line and at least one group of pixel units are formed, wherein the pixel units include a light emitting device and a pixel driving circuit connected to the light emitting device, The pixel driving circuit includes a switching unit, which is connected between the cathode of the light-emitting device and the touch signal line, and also connected between the cathode of the light-emitting device and a first voltage source. The switching unit is configured to turn on or off the connection between the cathode of the light-emitting device and the touch signal line according to a first switching signal, and to turn on or off the connection between the cathode of the light-emitting device and the first voltage source according to a second switching signal.

2. The touch display panel according to claim 1, characterized in that: The first switch unit includes a first transistor and a second transistor, A first electrode of the first transistor is connected to the cathode of the light emitting device, a gate of the first transistor is connected to a first switch signal line, and a second electrode of the first transistor is connected to the touch signal line; A first electrode of the second transistor is connected to the cathode of the light emitting device, a gate of the second transistor is connected to a second switch signal line, and a second electrode of the second transistor is connected to the first voltage source.

3. The touch display panel according to claim 1 or 2, characterized in that: The pixel driving circuit further includes: A driving unit, configured to output a light-emitting driving signal; the light-emitting driving signal is configured to drive the light-emitting unit; a light emitting control unit connected between the driving unit and the anode of the light emitting device, the light emitting control unit being configured to connect or disconnect the connection between the driving unit and the anode of the light emitting device according to a light emitting control signal; Preferably, the light emitting control unit comprises a third transistor, a first electrode of the third transistor is connected to the driving unit, a gate of the third transistor is connected to a light emitting control signal line, and a second electrode of the third transistor is connected to an anode of the light emitting device; Preferably, the driving unit comprises a fourth transistor, a first electrode of the fourth transistor is connected to a second voltage source, a gate of the fourth transistor is connected to a data signal, and a second electrode of the fourth transistor is connected to the light emitting control unit.

4. The touch display panel according to claim 1 or 2, characterized in that: The touch display panel comprises: A pixel unit film layer is formed on the substrate; a plurality of pixel units are formed in the pixel unit film layer; The pixel unit film layer includes a pixel definition layer and a light-emitting device film layer, the pixel definition layer includes a pixel definition portion and a pixel opening defined by the pixel definition portion, at least part of the light-emitting device film layer is located in the pixel opening; at least one light-emitting device is formed in the light-emitting device film layer.

5. The touch display panel according to claim 4, characterized in that: The pixel unit film layer further comprises an isolation column layer, wherein the isolation column layer is formed on a surface of the pixel definition layer away from the substrate, wherein a plurality of isolation columns spaced apart from each other are formed in the isolation column layer, and the isolation columns isolate at least part of the film layer of the light-emitting device film layer; Preferably, the pixel unit film layer further comprises a cathode layer, the cathode layer is formed on a surface of the light emitting device film layer away from the substrate, and the isolation column isolates the cathode layer between two adjacent pixel units; Preferably, the orthographic projection of the isolation column on the substrate is located between the orthographic projections of two adjacent pixel units on the substrate; Preferably, the orthographic projection of the surface of the isolation column away from the substrate on the substrate is a first projection, and the orthographic projection of the surface of the isolation column close to the substrate on the substrate is a second projection, and the second projection is within the range of the first projection; Preferably, the isolation columns are arranged in a grid shape, and the cathode of the light-emitting device is located in an opening formed by the grid structure; Preferably, a plurality of the light-emitting devices are arranged in the opening, and the cathodes of the plurality of the light-emitting devices are integrated as a whole.

6. The touch display panel according to claim 5, characterized in that: A touch metal layer is further included between the substrate and the pixel definition layer, and at least one touch signal line is formed in the touch metal layer; Preferably, the pixel definition layer is provided with a signal via, the orthographic projection of the signal via on the substrate at least partially overlaps with the orthographic projection of the touch signal line on the substrate, and the touch signal line is electrically contacted with the cathode layer through the signal via.

7. The touch display panel according to claim 5, characterized in that: The cathode layer is reused as the touch electrode in the touch control stage.

8. A method for driving a touch display panel, for driving the touch display panel according to any one of claims 1 to 7, wherein the pixel unit includes a first stage and a second stage in displaying a frame of an image, wherein: The driving method comprises: In the first stage, the pixel driving circuit receives a reset signal and a driving signal, and at the same time, during at least part of the first stage, the cathode of the light emitting device receives a touch signal; In the second stage, the pixel driving circuit receives a light emitting signal, and at the same time, the cathode of the light emitting device receives a first voltage source signal.

9. The method for driving a touch display panel according to claim 8, characterized in that: When the pixel driving circuit receives the reset signal, the cathode of the light emitting device receives the touch signal; or, when the pixel driving circuit receives the driving signal, the cathode of the light emitting device receives the touch signal; Preferably, the driving signal includes a data writing signal and a compensation signal; Preferably, the plurality of light-emitting devices are arranged in an array along the row direction and the column direction of the touch display panel, and during at least part of the time of the first stage, the level of the first switch signal is the on level, the level of the second switch signal is the off level, and the touch signal scans the cathodes of the light-emitting devices row by row or column by column; In the second stage, the level of the first switch signal is a cut-off level, the level of the second switch signal is a turn-on level, and the first voltage source simultaneously inputs the first voltage source signal to the cathodes of all light-emitting devices.

10. A display device, characterized in that: It comprises the touch display panel as claimed in any one of claims 1 to 7.

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