Touch display panel, crack detection method thereof and display device

Abstract

The invention provides a touch display panel, a crack detection method thereof and a display device. The touch display panel comprises a display substrate, a functional chip, a functional wire and a multiplexer. The display substrate comprises a display area and a non-display area located on the periphery of the display area. The functional chip is located on the display substrate and located in the non-display area. The function wires are located in the non-display area and arranged around the display area, the function wires comprise the first function wire and the second function wire which are arranged oppositely at intervals, and one end of the first function wire and one end of the second function wire are connected with the function chip. The free end of the first function wire and the free end of the second function wire form a detection capacitor. And the multiplexer is controlled by the functional chip to transmit a detection signal or a preset signal to the first functional wire and the second functional wire. According to the touch display panel with the structure, the problem that a narrow frame cannot be realized easily due to the fact that the PCD wiring occupies a large space is solved.

Description

Technical Field

[0001] The present disclosure relates to the field of touch display technology, and in particular, to a touch display panel and a crack detection method and a display device thereof. Background Art

[0002] Organic-Light-Emitting Diode (OLED) display panels are soft in texture, and there is a risk of edge damage and cracking during the manufacturing process. Furthermore, there is a risk of crack deterioration during the reliability process, resulting in abnormal display of the OLED display panel.

[0003] In order to determine whether there are cracks in the OLED display panel during the manufacturing process, the prior art usually forms a circle of metal wire on the edge of the display panel as a panel crack detection (PCD) line. The PCD line forms a conductor loop around the edge of the display panel. The resistance and voltage of the PCD line are tested to monitor whether there are cracks in the PCD line, thereby determining whether the edge of the OLED display panel is damaged.

[0004] However, the PCD wiring occupies a large space, which is not conducive to achieving a narrow frame of the OLED display panel. Summary of the invention

[0005] The present disclosure provides a touch display panel, a crack detection method and a display device thereof. By forming a detection capacitor at the free end of a functional wiring in the touch display panel, the functional wiring can replace a PCD wiring, thereby realizing crack detection of the touch display panel, thereby improving the problem that the PCD wiring occupies a large space and is not conducive to achieving a narrow frame.

[0006] The first aspect of the present disclosure provides a touch display panel. The touch display panel includes a display substrate, a functional chip, a functional wiring, and a multiplexer. The display substrate includes a display area and a non-display area located outside the display area. The touch structure is located on one side of the display substrate and corresponds to the display area. The functional chip is located on the display substrate and in the non-display area. The functional wiring is located in the non-display area and is arranged around the display area. The functional wiring includes a first functional wiring and a second functional wiring that are spaced apart from each other and arranged opposite to each other. One end of the first functional wiring and one end of the second functional wiring are respectively connected to the functional chip, and the free end of the first functional wiring and the free end of the second functional wiring constitute a detection capacitor. The multiplexer is controlled by the functional chip to transmit a detection signal or a preset signal to the first functional wiring and the second functional wiring.

[0007] In the above scheme, the PCD line is replaced by the functional line in the touch display panel, and the multiplexer is used to selectively input the signal to realize the crack detection around the display area of ​​the touch display panel without affecting the normal operation of the touch display panel. There is no need to add a new PCD line, which is conducive to realizing a narrow frame of the touch display panel.

[0008] In a specific embodiment of the first aspect of the present disclosure, the multiplexer includes a first multiplexer and a second multiplexer. The detection signal includes a touch signal and a sensing signal, and the sensing signal is used to detect the capacitance value of the detection capacitor. The first multiplexer is used to implement the gating of the touch signal, and the second multiplexer is used to implement the gating of the sensing signal.

[0009] In a specific embodiment of the first aspect of the present disclosure, the function chip includes a touch chip, the first multiplexer includes a first output signal line connected to the first function line and a first input signal line, a second input signal line and a first control signal line respectively connected to the touch chip, the first input signal line is used to transmit a preset signal, the second input signal line is used to transmit a touch signal, and the first control signal line is used to transmit a selection signal of the first input signal line and the second input signal line. The second multiplexer includes a second output signal line connected to the second function line and a third input signal line, a fourth input signal line and a second control signal line respectively connected to the touch chip, the third input signal line is used to transmit a preset signal, the fourth input signal line is used to transmit a sensing signal, and the second control signal line is used to transmit a selection signal of the third input signal line and the fourth input signal line.

[0010] In the above scheme, the first multiplexer and the second multiplexer can control the conduction of the first input signal line and the third input signal line through the selection signals of the first control signal line and the second control signal line to realize the transmission of the preset signal, or control the conduction of the second input signal line and the fourth input signal line to realize the transmission of the touch signal and the sensing signal according to the requirements of the touch display panel, thereby realizing the switching between the normal operation of the touch display panel and the crack detection state.

[0011] In a specific embodiment of the first aspect of the present disclosure, the touch display panel also includes a touch structure, which includes a plurality of first touch electrodes and a plurality of second touch electrodes located in the display area and a first signal line and a second signal line. The first touch electrode and the second touch electrode cross each other to form a touch capacitor. One end of the first signal line and the second signal line are respectively connected to the first touch electrode and the second touch electrode, and the other end of the first signal line and the second signal line are respectively connected to the touch chip. For example, further, the first signal line and the second signal line are located in the non-display area. For example, further, the first functional wiring and the second functional wiring are formed in the same layer and the same material as at least part of the touch structure. For example, further, the first functional wiring and the second functional wiring are respectively arranged around the display area to form a semi-enclosed space, and the display area is located in the semi-enclosed space.

[0012] In the above solution, the first functional wiring and the second functional wiring are configured to be manufactured by the same process as a part of the film layer in the touch display panel, thereby reducing the processing cost of the touch display panel.

[0013] In a specific embodiment of the first aspect of the present disclosure, the first functional wiring and the second functional wiring are in the same layer and made of the same material, and the free end of the first functional wiring and the free end of the second functional wiring are spaced and staggered to form a preset pattern. For example, further, the preset pattern is a "Z" type or a "two" type.

[0014] In a specific embodiment of the first aspect of the present disclosure, the first functional wiring and the second functional wiring are in different layers, and in a direction perpendicular to the display substrate, a free end of the first functional wiring and a free end of the second functional wiring at least partially overlap.

[0015] In the above solution, the first functional wiring and the second functional wiring can be designed in various structures according to the structure of the touch display panel, thereby improving the adaptability of the solution.

[0016] In a specific embodiment of the first aspect of the present disclosure, the first touch electrode and the second touch electrode are arranged in the same layer, the touch structure also includes multiple conductive bridges, the conductive bridges are used to connect the first touch electrode and the second touch electrode, and the first functional routing is in the same layer and the same material as the first touch electrode and one of the conductive bridges, and the second functional routing is in the same layer and the same material as the first touch electrode and the other of the conductive bridges; or, the first functional routing and the second functional routing are in the same layer and the same material as the first touch electrode and / or the conductive bridge.

[0017] In the above solution, when the first touch electrode and the second touch electrode are arranged on the same layer, the first functional wiring and the second functional wiring are designed as required using the existing first touch electrode and the conductive bridge, without adding a new film layer, thereby reducing the processing cost of the touch display panel.

[0018] In a specific embodiment of the first aspect of the present disclosure, the first touch electrode and the second touch electrode are arranged in different layers, the first functional routing is in the same layer and the same material as one of the first touch electrode and the second touch electrode, and the second functional routing is in the same layer and the same material as the other of the first touch electrode and the second touch electrode; or, the first functional routing and the second functional routing are in the same layer and the same material as the first touch electrode and / or the second touch electrode.

[0019] In the above solution, when the first touch electrodes and the second touch electrodes are arranged in different layers, the first functional wiring and the second functional wiring are designed as required using the existing first touch electrodes and the second touch electrodes, without adding new processes, thereby saving production costs.

[0020] In a specific implementation of the first aspect of the present disclosure, the functional wiring is a ground wire.

[0021] In the above solution, the functional routing can not only realize electrostatic shielding to avoid the influence of static electricity on the performance of the touch structure, but also realize crack detection around the touch structure.

[0022] The second aspect of the present disclosure provides a method for detecting cracks in a touch display panel. The method for detecting cracks in a touch display panel includes obtaining a touch display panel, which is the touch display panel in the first aspect. Disconnecting the first function wiring and the second function wiring in the touch display panel from the transmission channel of the preset signal respectively, so that the first function wiring and the transmission channel of the touch signal and the second function wiring and the transmission channel of the sensing signal are respectively connected, and the sensing signal is used to detect the capacitance value of the detection capacitor formed by the free ends of the first function wiring and the second function wiring. Obtain the capacitance value of the detection capacitor. Determine whether the touch display panel has cracks according to the capacitance value of the detection capacitor.

[0023] A third aspect of the present disclosure provides a display device, which includes the touch display panel in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of a planar structure of a touch display panel provided in one embodiment of the present disclosure.

[0025] Figure 2 A schematic diagram of multiplexer signal connection in a touch display panel provided by an embodiment of the present disclosure.

[0026] Figure 3 A schematic diagram of a planar structure of a touch display panel provided in one embodiment of the present disclosure.

[0027] Figure 4 for Figure 3An enlarged view of point A of a touch display panel is shown.

[0028] Figure 5 A cross-sectional schematic diagram of a touch display panel provided by an embodiment of the present disclosure.

[0029] Figure 6 for Figure 3 An enlarged view of another touch display panel A is shown.

[0030] Figure 7 A cross-sectional schematic diagram of a touch display panel provided by another embodiment of the present disclosure.

[0031] Figure 8 A cross-sectional schematic diagram of a touch display panel provided by an embodiment of the present disclosure.

[0032] Fig. 9 A cross-sectional schematic diagram of a touch display panel provided by an embodiment of the present disclosure.

[0033] Fig.10 A cross-sectional schematic diagram of a touch display panel provided by an embodiment of the present disclosure.

[0034] Fig.11 A cross-sectional schematic diagram of a touch display panel provided by another embodiment of the present disclosure.

[0035] Fig.12 A cross-sectional schematic diagram of a touch display panel provided by another embodiment of the present disclosure.

[0036] Fig.13 A cross-sectional schematic diagram of a touch display panel provided by another embodiment of the present disclosure.

[0037] Fig.14 The present invention is a flowchart of a method for detecting cracks in a touch display panel provided by an embodiment of the present invention.

[0038] Fig.15 A cross-sectional schematic diagram of a display device provided by an embodiment of the present disclosure. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0040] With the development of technology, OLED display panels, especially OLED display panels with touch functions, i.e., touch display panels, are widely used because they can have both touch and visual functions and can meet users' multi-functional needs for OLED display panels. As users' requirements for touch display panels, such as touch performance and portability, become higher and higher, bendable touch display panels are becoming more and more popular in the market because of their advantages such as good portability. However, due to the limitations of their own design, the current touch display panels are very likely to crack in the touch layer when bent or subjected to external force, resulting in touch failure, which reduces the service life of the touch display panel. Therefore, a crack detection line (which can be called a PCD line) is set in the touch display panel to detect whether the touch structure in the touch display panel has cracks and the severity of the cracks. However, the existing PCD line occupies too much space in the touch display panel, which is not conducive to the realization of a narrow frame of the touch display panel.

[0041] In view of this, the embodiments of the present disclosure provide a touch display panel, a crack detection method and a display device thereof, by configuring the first functional wiring and the second functional wiring in the touch display panel to be respectively connected to a functional chip at one end and to form a detection capacitor at the other end, and controlling the signal selectively output by the multiplexer through the functional chip, the first functional wiring and the second functional wiring can replace the PCD wiring to achieve the function of crack detection without affecting the normal operation of the touch display panel, thereby improving the problem that the PCD wiring is not conducive to achieving a narrow bezel of the touch display panel.

[0042] A touch display panel is provided in an embodiment of the present disclosure. The touch display panel includes a display substrate, a touch structure, a functional chip, a functional wiring, and a multiplexer. The display substrate includes a display area and a non-display area located outside the display area. The touch structure is located on one side of the display substrate and corresponds to the display area. The functional chip is located on the display substrate and located in the non-display area. The functional wiring is arranged outside the display area, and the functional wiring includes a first functional wiring and a second functional wiring that are spaced from each other and extend from the display area to the non-display area. One end of the first functional wiring and one end of the second functional wiring are respectively connected to the functional chip, and the free end of the first functional wiring and the free end of the second functional wiring are adjacent to each other to form a detection capacitor. The multiplexer is controlled by the functional chip to transmit a detection signal or a preset signal to the first functional wiring and the second functional wiring. In this way, based on the original functional routing in the touch display panel, by detecting the capacitance value of the capacitor when the first functional routing and the second functional routing receive the detection signal, it is determined whether the touch structure of the touch display panel has cracks, thereby utilizing the functional routing to achieve crack detection, without the need to set up PCD routing separately in the non-display area, which is conducive to achieving a narrow bezel of the touch display panel.

[0043] In the following, the touch display panel and crack detection method and display device according to at least one embodiment of the present disclosure are described in conjunction with the accompanying drawings. In addition, as shown in the accompanying drawings, in at least one embodiment of the present disclosure, a spatial rectangular coordinate system is established with the surface where the touch display panel is located as a reference to define the positions of various film layers in the touch display panel. In the spatial rectangular coordinate system, the X-axis and the Y-axis are parallel to the surface where the touch display panel is located, and the Z-axis is perpendicular to the surface where the touch display panel is located.

[0044] In the touch display panel 10 provided in at least one embodiment of the present disclosure, as Figure 1 and Figure 2 As shown, the touch display panel 10 includes a display substrate 110 , a function chip 130 , a function wiring 140 and a multiplexer 150 .

[0045] The display substrate 110 includes a display area 111 and a non-display area 112 located outside the display area 111 .

[0046] The function chip 130 is located on the display substrate 110 and in the non-display area 112. The function chip 130 is located in the binding area of ​​the non-display area 112, and the touch signal lines in the touch structure 120 extend to the binding area of ​​the non-display area 112 for binding.

[0047] The functional wiring 140 is located in the non-display area 11 and is arranged around the display area 111. The functional wiring 140 includes a first functional wiring 141 and a second functional wiring 142 that are spaced apart from each other and arranged opposite to each other, and the display area 111 is located in a figure surrounded by the first functional wiring 141 and the second functional wiring 142. One end of the first functional wiring 141 is connected to the functional chip 130, and the free end of the first functional wiring 141 extends in a direction away from the functional chip 130. One end of the second functional wiring 142 is connected to the functional chip 130, and the free end of the second functional wiring 142 extends in a direction away from the functional chip 130. The free end of the first functional wiring 141 and the free end of the second functional wiring 142 are adjacent to each other to form a detection capacitor.

[0048] In the disclosed embodiment, the function chip 130 is respectively connected to one end of the first function wiring 141 and the second function wiring 142 to detect the capacitance value of the detection capacitor formed by the free ends of the first function wiring 141 and the second function wiring 142. Specifically, the function chip 130 first controls the application of a driving voltage to the first function wiring 141, and then receives the sensing signal of the capacitance value of the corresponding detection capacitance transmitted by the second function wiring 142, so as to determine whether the touch structure 120 has cracks. For example, in the case of a fracture of the touch structure 120, the capacitance value of the detection capacitor becomes smaller or zero due to the increase or infinity of the impedance of the first function wiring 141 and / or the second function wiring 142.

[0049] The multiplexer 150 is controlled by the function chip 130 to transmit the detection signal or the preset signal to the first function wiring 141 and the second function wiring 142. In this way, the multiplexer 150 can select different signal channels according to the requirements of the touch display panel 10 based on the selection signal, thereby realizing the selective transmission of the detection signal or the preset signal.

[0050] It should be noted that the structure of the touch display panel 10 provided in the present disclosure is not limited to the above embodiments and illustrations, and may also include other design schemes. For example, the display substrate 110 may be an OLED display substrate, a liquid crystal display substrate, an electronic paper display substrate, etc. Taking the OLED display substrate as an example, it includes a plurality of pixel units arranged in an array, each pixel unit includes sub-pixels, and according to the display requirements, the sub-pixels are selected to be arranged as at least one of the sub-pixels emitting red light, the sub-pixels emitting blue light, and the sub-pixels emitting green light. For another example, the touch area includes at least two sub-touch areas, and the number of sub-touch areas is not more than the number of sub-display areas into which the display area 111 is divided, and the functional chip 130 and the touch signal line (including but not limited to the first signal line and the second signal line mentioned below) respectively include at least two sub-chips and at least two sub-touch signal lines corresponding to the sub-touch areas one by one. All of the above can be designed according to actual needs, and will not be repeated here.

[0051] In addition to introducing a design scheme for how to use the functional wiring 140 in the touch display panel 10 to replace the PCD line to realize crack detection of the touch structure 120, the embodiment of the present disclosure also introduces a design scheme for how the multiplexer 150, under the control of the functional chip 130, enables the functional wiring 140 in the touch display panel 10 to realize the crack detection function while realizing its own preset function. The specific contents are as follows.

[0052] In a touch display panel 10 provided in an embodiment of the present disclosure, the function chip 130 includes a touch chip 130a, such as Figure 2As shown, specifically, when it is necessary to detect whether the touch display panel 10 has cracks, the multiplexer 150 selects the channels of the first function wiring 141 and the second function wiring 142 corresponding to the detection signal, that is, the touch signal and the sensing signal, respectively, and the touch chip 130a controls the multiplexer 150 to transmit the touch signal to the first function wiring 141 or the second function wiring 142, and transmits the sensing signal used to detect the capacitance value of the detection capacitor to the touch chip 130a through the second function wiring 142 or the first function wiring 141, so as to determine whether the touch display panel 10 has cracks. When the touch display panel 10 works normally, the multiplexer 150 selects the channels of the first function wiring 141 and the second function wiring 142 corresponding to the preset signal to realize the preset functions of the first function wiring 141 and the second function wiring 142.

[0053] It should be noted that the structure of the touch display panel 10 in the embodiment of the present disclosure is not limited to the above embodiment, and it may also include other structures. For example, a plurality of first function wirings 141 and second function wirings 142 may be arranged at intervals, and some of them have preset functions while also replacing the PCD line, and the remaining parts may only have preset functions. For another example, the multiplexer 150 in the touch display panel 10 may be a circuit architecture including NMOS thin film transistors and / or PMOS thin film transistors. All of the above can be designed according to actual needs and will not be elaborated here.

[0054] The preset signal in the embodiment of the present disclosure is a signal that satisfies the preset function of the touch display panel 10 , which is different from the touch signal. The preset function is designed according to the requirements of the touch display panel 10 .

[0055] For example, in the touch display panel 10 provided in at least one embodiment of the present disclosure, Figure 1 and Figure 3 As shown, the functional wiring 140 is a ground wire, that is, the preset signal is a ground signal, and the preset function is an electrostatic shielding function, that is, the first functional wiring 141 and the second functional wiring 142 conduct static charge into the touch display panel 10, effectively improving the ESD (Electro-Static discharge) capability of the touch display panel 10.

[0056] Based on the working relationship between the multiple multiplexers and the touch chip 130 a and the first functional wiring 141 and the second functional wiring 142 in the above embodiments, the embodiment of the present disclosure also introduces the signal connection method between the three, and the specific content is as follows.

[0057] In the touch display panel 10 provided in at least one embodiment of the present disclosure, as Figure 2As shown, the multiplexer 150 includes a first multiplexer 151 and a second multiplexer 152. The detection signal includes a touch signal and a sensing signal, and the sensing signal is used to detect the capacitance value of the detection capacitor. The first multiplexer 151 is used to realize the gating of the touch signal, and the second multiplexer 152 is used to realize the gating of the sensing signal.

[0058] In the touch display panel 10 provided in at least one embodiment of the present disclosure, as Figure 2 As shown, the first multiplexer 151 includes a first output signal line 151a, a first input signal line 151b, a second input signal line 151c and a first control signal line 151d. The first multiplexer 151 is connected to the first function wiring 141 through the first output signal line 151a, and is connected to the touch chip 130a through the first input signal line 151b, the second input signal line 151c and the first control signal line 151d. The second multiplexer 152 includes a second output signal line 152a, a third input signal line 152b, a fourth input signal line 153c and a second control signal line 152d. The second multiplexer 152 is connected to the second function wiring 142 through the second output signal line 152a, and is connected to the touch chip 130a through the third input signal line 152b, the fourth input signal line 153c and the second control signal line 152d.

[0059] Specifically, the signal channel is selected according to the first control signal line 151d and the second control signal line 152d. For example, after the first control signal line 151d and the second control signal line 152d respectively transmit the high-level signal output by the touch chip 130a to the corresponding multiplexer 150, the first multiplexer 151 conducts the signal channel between the first output signal line 151a and the first input signal line 151b, and transmits the preset signal output by the touch chip 130a, such as the ground signal, to the first functional line 141; the second multiplexer 152 conducts the signal channel between the second output signal line 152a and the third input signal line 152b, and transmits the preset signal output by the touch chip 130a, such as the ground signal, to the second functional line 142; at this time, the touch display panel 10 works normally, and the first functional line 141 and the second functional line 142 serve as ground lines to play the role of electrostatic shielding. For example, after the first control signal line 151d and the second control signal line 152d respectively transmit the low-level signal output by the touch chip 130a to the corresponding multiplexer 150, the first multiplexer 151 turns on the signal channel between the first output signal line 151a and the second input signal line 151c, and transmits the touch signal output by the touch chip 130a, that is, the driving voltage signal, to the first functional wiring 141; the second multiplexer 152 turns on the signal channel between the second output signal line 152a and the fourth input signal line 153c, and transmits the sensing signal to the touch chip 130a through the channel. At this time, the touch display panel 10 performs crack detection, and the touch chip 130a obtains the capacitance value of the detection capacitor according to the acquired sensing signal to determine whether the touch structure 120 of the touch display panel 10 has cracks.

[0060] In the embodiment of the present disclosure, the connection relationship between the first multiplexer 151 and the second multiplexer 152 and the first functional wiring 141 and the second functional wiring 142 is not limited to the above embodiment, and can be specifically designed according to actual needs, which will not be elaborated here.

[0061] Based on the above embodiments, the embodiment of the present disclosure further includes a touch control structure 120 located on one side of the display substrate 110 and corresponding to the display area 111. The touch control structure 120 forms a touch control area correspondingly. The size of the touch control area can be the same as the size and shape of the display area 111, or slightly larger than the display area 111, so as to ensure that the user can achieve touch control at any position of the display area 111. In addition, the embodiment of the present disclosure also specifically introduces the touch control structure 120, as follows.

[0062] In a touch display panel 10 provided in an embodiment of the present disclosure, a touch structure 120 includes a plurality of first touch electrodes 121 and a plurality of second touch electrodes 122, and a first signal line 123 and a second signal line 124 located in a display area 111. The first touch electrodes 121 and the second touch electrodes 122 cross each other to form a touch capacitor. One end of the first signal line 123 and the second signal line 124 are respectively connected to the first touch electrode 121 and the second touch electrode 122, and the other end of the first signal line 123 and the second signal line 124 are respectively connected to the touch chip 130a.

[0063] For example, Figure 3 , Figure 4 and Figure 6 As shown, the touch control structure 120 includes a plurality of first touch control electrodes 121 arranged in parallel along a first direction (for example, the first direction may be the X-axis direction) and a plurality of second touch control electrodes 122 arranged in parallel along a second direction intersecting the first direction (for example, the second direction may be the Y-axis direction) located in the display area 111, and each first touch control electrode 121 and each second touch control electrode 122 intersect each other to form a plurality of touch control capacitors, i.e., touch control units. One end of the plurality of first signal lines 123 is connected to the plurality of first touch control electrodes 121, and the other end of the plurality of first signal lines 123 is connected to the touch control chip 130a. One end of the plurality of second signal lines 124 is connected to the plurality of second touch control electrodes 122, and the other end of the plurality of second signal lines 124 is connected to the touch control chip 130a.

[0064] In the touch display panel 10 provided in at least one embodiment of the present disclosure, as Figure 3 As shown, a plurality of first signal lines 123 and a plurality of second signal lines 124 are respectively located in the non-display area 112 and are arranged in parallel with each other in the X-axis direction.

[0065] The touch structure 120 in the touch display panel 10 in the present disclosure adopts capacitive touch technology, which includes self-capacitance and mutual capacitance. The self-capacitance touch display panel 10 is a self-capacitance formed by the touch electrode and the human body, and the position detection is performed using the change of self-capacitance. The mutual capacitance structure is a mutual capacitance formed by the first touch electrode 121 and the second touch electrode 122, and the position detection is performed using the change of mutual capacitance. The mutual capacitance touch panel can be divided into a single-layer electrode structure and a double-layer electrode structure. The single-layer electrode structure is characterized in that the first touch electrode 121 and the second touch electrode 122 are arranged in the same layer, and the double-layer electrode structure is characterized in that the first touch electrode 121 and the second touch electrode 122 are arranged in different layers. The self-capacitance touch panel is a single-layer structure, which has the characteristics of low power consumption and simple structure.

[0066] It should be noted that one of the first touch electrode 121 and the second touch electrode 122 in the embodiment of the present disclosure may be a sensing electrode (Receive, RX), and the other may be a transmitting electrode (Transmit, TX). The area where the sensing electrode and the transmitting electrode intersect may form a touch capacitor. A scanning signal is applied to the transmitting electrode. If the user's finger approaches the intersection, a parasitic capacitor will be formed between the sensing electrode or the transmitting electrode and the user's finger. The parasitic capacitor will cause the voltage of the touch capacitor to float, that is, the capacitance value of the touch capacitor formed at the intersection of the sensing electrode and the transmitting electrode will change. By detecting the sensing electrode whose voltage has changed, the position of the touch capacitor whose capacitance value has changed can be determined, and the touch position can be located, thereby achieving touch control.

[0067] Next, the touch structure 120 of the touch display panel 10 is introduced by assuming that the touch display panel 10 in the embodiment of the present disclosure is a mutual capacitive touch panel.

[0068] In a touch display panel 10 provided in an embodiment of the present disclosure, as Figure 3 and Figure 4 , Figure 5 As shown, a touch layer is provided on the display substrate 110, and the touch layer forms a touch structure 120. The touch structure 120 includes a first touch electrode 121, a second touch electrode 122, and a conductive bridge 125. The first touch electrode 121 and the second touch electrode 122 are formed in the same layer and the same material, that is, they are formed by the same conductive film layer in the same patterning process. The touch structure 120 also includes a plurality of conductive bridges 125. The first touch electrode 121 and the second touch electrode 122 intersect each other and respectively include a plurality of first sub-electrodes and second sub-electrodes. The first touch electrode 121 is disconnected at the intersection with the second touch electrode 122, and the disconnected first sub-electrodes in the same first touch electrode 121 are connected through the conductive bridge 125. An insulating layer 126 is provided between the film layer where the first touch electrode 121 and the second touch electrode 122 are located and the film layer where the conductive bridge 125 is located, so as to separate the conductive bridge 125 from the first touch electrode 121 and the second touch electrode 122. The insulating layer 126 is provided with a through hole, and the conductive bridge 125 is connected to the first sub-electrode of the first touch electrode 121 through the through hole.

[0069] In a touch display panel 10 provided in another embodiment of the present disclosure, as shown in FIG. Figure 3 , Figure 6 and Figure 7 As shown, a touch layer is disposed on the display substrate 110 , the touch layer forms a touch structure 120 , and the touch layer includes a first touch electrode 121 , a second touch electrode 122 , and an insulating layer 126 located between the first touch electrode 121 and the second touch electrode 122 .

[0070] It should be noted that the first signal line 123 and the second signal line 124 in the touch display panel 10 in the embodiment of the present disclosure can be formed in the same process as at least one of the conductive structures of the touch structure 120 (including the first touch electrode 121, the second touch electrode 122, the conductive bridge 125, etc.), and the first signal line 123 and the second signal line 124 can be a single-layer structure, or a double-layer or multi-layer structure. In this way, the manufacturing process of the touch display panel 10 can be simplified and the cost can be reduced.

[0071] In the touch display panel 10 provided in one embodiment of the present disclosure, the first functional wiring 141 and the second functional wiring 142 in the touch display panel 10 are formed in the same layer and the same material as at least part of the touch structure 120. In this way, the first functional wiring 141 and the second functional wiring 142 can be simultaneously prepared during the process of preparing the touch structure 120, thereby reducing the preparation cost of the touch display panel 10.

[0072] Based on the above embodiments, the present disclosure introduces a design scheme for the first functional wiring 141 and the second functional wiring 142 relative to the first touch electrode 121 and the second touch electrode 122 when the first touch electrode 121 and the second touch electrode 122 are arranged in the same layer. The specific contents are as follows.

[0073] In a touch display panel 10 provided in an embodiment of the present disclosure, the first functional wiring 141 is in the same layer and made of the same material as the first touch electrode 121 and the conductive bridge 125, and the second functional wiring 142 is in the same layer and made of the same material as the other of the first touch electrode 121 and the conductive bridge 125. For example, Figure 5 As shown, the touch display panel 10 includes a display substrate 110, a touch electrode layer arranged on the display substrate 110, an insulating layer 126 located on the side of the touch electrode layer away from the display substrate 110, and a conductive bridge 125 located on the insulating layer 126 away from the display substrate 110. The touch electrode layer includes a first touch electrode 121 and a second touch electrode 122, which together with the conductive bridge 125 form a touch structure 120 of the touch display panel 10. The specific design of the touch structure 120 can refer to the above embodiments and will not be repeated here. The first functional wiring 141 and the second functional wiring 142 are arranged in different layers. For example, the first functional wiring 141 and the first touch electrode 121 and the second touch electrode 122, that is, the touch electrode layer are in the same layer and the same material, and the second functional wiring 142 and the conductive bridge 125 are in the same layer and the same material.

[0074] In the touch display panel 10 provided in another embodiment of the present disclosure, the first functional wiring 141 and the second functional wiring 142 are in the same layer and made of the same material as the first touch electrode 121 and / or the conductive bridge 125. Exemplarily, the touch display panel 10 includes a display substrate 110 and a touch structure 120, and the touch structure 120 includes a first touch electrode 121, a second touch electrode 122 and a conductive bridge 125. The specific structure of the touch display panel 10 can be referred to the above embodiment and will not be described in detail here. The first functional wiring 141 and the second functional wiring 142 are arranged in the same layer.

[0075] It should be noted that, in the above-mentioned “and” relationship, it means that the first functional wiring 141 and the second functional wiring 142 are double-layer wirings, which can reduce the voltage drop on the first functional wiring 141 and the second functional wiring 142 to improve the detection accuracy.

[0076] For example, Figure 8 As shown, the first functional wiring 141 and the second functional wiring 142 are respectively in the same layer and made of the same material as the first touch electrode 121 and the second touch electrode 122 , ie, the touch electrode layer.

[0077] For example, Fig. 9 As shown, the first functional trace 141 and the second functional trace 142 are respectively in the same layer and made of the same material as the conductive bridge 125 .

[0078] For example, Fig.10 As shown, the first functional trace 141 and the second functional trace 142 are respectively in the same layer and made of the same material as the touch electrode layer (including the first touch electrode 121 and the second touch electrode 122) and the conductive bridge 125. The first functional trace 141 located in different film layers and the second functional trace 142 located in different film layers are respectively connected in parallel through vias.

[0079] Based on the above embodiments, the present disclosure introduces a design scheme for the first functional wiring 141 and the second functional wiring 142 relative to the first touch electrode 121 and the second touch electrode 122 when the first touch electrode 121 and the second touch electrode 122 are arranged in different layers. The specific contents are as follows.

[0080] In the touch display panel 10 provided in one embodiment of the present disclosure, the first functional wiring 141 is in the same layer and made of the same material as one of the first touch electrode 121 and the second touch electrode 122, and the second functional wiring 142 is in the same layer and made of the same material as the other of the first touch electrode 121 and the second touch electrode 122. In other words, the first functional wiring 141 and the second functional wiring 142 are arranged in different layers.

[0081] For example, Figure 7As shown, in the touch display panel 10, the first touch electrode 121 is disposed on the display substrate 110, the second touch electrode 122 is located on the side of the first touch electrode 121 away from the display substrate 110, and the insulating layer 126 is located between the first touch electrode 121 and the second touch electrode 122. The first functional wiring 141 is in the same layer and made of the same material as the first touch electrode 121, and the second functional wiring 142 is in the same layer and made of the same material as the second touch electrode 122. Alternatively, as Fig.11 As shown, the first functional wiring 141 and the second touch electrode 122 are in the same layer and made of the same material, and the second functional wiring 142 and the first touch electrode 121 are in the same layer and made of the same material.

[0082] In a touch display panel 10 provided in another embodiment of the present disclosure, as shown in FIG. Fig.12 and Fig.13 As shown, the first functional wiring 141 and the second functional wiring 142 are in the same layer and made of the same material as the first touch electrode 121 or the first functional wiring 141 and the second functional wiring 142 and the second touch electrode 122 .

[0083] For example, Fig.12 and Fig.13 As shown, the touch display panel 10 includes a display substrate 110, a first touch electrode 121, an insulating layer 126 and a second touch electrode 122 stacked in sequence, and a first functional wiring 141 and a second functional wiring 142 are arranged in the same layer. Fig.12 As shown, the first functional wiring 141 and the second functional wiring 142 are in the same layer and made of the same material as the first touch electrode 121, or as shown in FIG. Fig.13 As shown, the first functional wiring 141 and the second functional wiring 142 are in the same layer and made of the same material as the second touch electrode 122 .

[0084] Based on the above embodiments, in the touch display panel 10 provided in at least one embodiment of the present disclosure, as shown in FIG. Figure 1 and Figure 3 As shown, the first functional wiring 141 and the second functional wiring 142 are respectively arranged around the display area 111 to form a semi-enclosed space, and the display area 111 is located in the semi-enclosed space.

[0085] In a touch display panel 10 provided in an embodiment of the present disclosure, as Figure 3 As shown, when the first functional wiring 141 and the second functional wiring 142 are in the same layer and made of the same material, the first functional wiring 141 and the second functional wiring 142 are on the periphery of the display area 111 and located on the non-display area 112, the second functional wiring 142 is arranged opposite to the first functional wiring 141 and surrounds the periphery of the display area 111, the free end of the first functional wiring 141 and the free end of the second functional wiring 142 are arranged close to each other and spaced apart and interlaced with each other to form a detection capacitor, and a preset pattern is formed.

[0086] In the touch display panel 10 provided in at least one embodiment of the present disclosure, as Figure 3 and Figure 4 As shown, the preset pattern is a "Z" type or a "two" type. In this way, the detection capacitor with a preset pattern formed by the free end of the first functional wiring 141 and the free end of the second functional wiring 142 not only enables the first functional wiring 141 and the second functional wiring 142 to replace the PCD line, but also enables the first functional wiring 141 and the second functional wiring 142 to avoid the antenna effect and the impurities from entering the touch structure 120 when they are used as preset functions such as electrostatic shielding functions, thereby improving the quality of the touch display panel 10.

[0087] In the touch display panel 10 provided in some other embodiments of the present disclosure, when the first functional wiring 141 and the second functional wiring 142 are arranged in different layers, in the direction perpendicular to the display substrate 110, the free end of the first functional wiring 141 and the free end of the second functional wiring 142 at least partially overlap. For example, Fig.14 As shown, the first functional wiring 141 and the first touch electrode 121 are arranged in the same layer, the second functional wiring 142 and the second touch electrode 122 are arranged in the same layer, and the first touch electrode 121 and the second touch electrode 122 are in different layers, and the orthographic projection of the free end of the first functional wiring 141 on the display substrate 110 and the orthographic projection of the free end of the second functional wiring 142 on the display substrate 110 at least partially overlap, and the overlapping part is filled with an insulating layer 126, thereby forming a detection capacitor.

[0088] It should be noted that the design of the capacitor formed by the free ends of the first function wiring 141 and the second function wiring 142 in the touch display panel 10 disclosed in the present invention is not limited to the above embodiments. For example, when the first function wiring 141 and the second function wiring 142 are located in different layers, the free ends of the two (the ends forming the capacitor) can overlap each other in space, and without increasing the width of the non-display area 112 (the width of the non-touch area, the frame width), it is set to have a larger area to improve the detection accuracy (increase the capacitance). For example, the width of the free end of the first function wiring 141 is greater than the width of the other parts, the width of the free end of the second function wiring 142 is greater than the width of the other parts, and the orthographic projection of the free end of the first function wiring 141 on the display substrate 110 coincides with the orthographic projection of the free end of the second function wiring 142 on the display substrate 110. The above can be designed according to actual needs and will not be repeated here.

[0089] The present disclosure provides a method for detecting cracks in a touch display panel. Fig.14 As shown, the crack detection method of the touch display panel includes the following steps:

[0090] Step S01: Acquire a touch display panel.

[0091] The touch display panel is the touch display panel in the above embodiment.

[0092] Step S02: Disconnect the first function wiring and the second function wiring in the touch display panel from the transmission channel of the preset signal respectively, so that the first function wiring and the transmission channel of the touch signal and the second function wiring and the transmission channel of the sensing signal are respectively connected, and the sensing signal is used to detect the capacitance value of the detection capacitor formed by the free ends of the first function wiring and the second function wiring.

[0093] Exemplarily, a multiplexer in the touch display panel is used to select a detection signal or a preset signal, so that the touch display panel enters a crack detection mode or a normal working mode. The specific operation can refer to the above embodiments and will not be described in detail here.

[0094] Step S03: Obtaining the capacitance value of the detection capacitor. The sensing signal is transmitted to a functional chip such as a touch chip via the fourth input signal line, thereby obtaining the capacitance value between the first functional wiring and the second functional wiring, that is, the capacitance value of the detection capacitor.

[0095] Step S04: judging whether the touch display panel has cracks according to the capacitance value of the detection capacitor.

[0096] If the capacitance value of the detection capacitor decreases or becomes zero, the touch display panel has cracks. If the capacitance value of the detection capacitor remains substantially unchanged, the touch display panel has no cracks.

[0097] The embodiment of the present disclosure provides a display device. The display device includes a touch display panel. The structure of the touch display panel can refer to the description of the above embodiment, and will not be repeated here.

[0098] For example, Fig.15 As shown, the touch display panel 10 in the display device 1 in the embodiment of the present disclosure may be a TOE (Touch on Encapsulation) touch display panel 10. Specifically, the touch structure 120 in the TOE touch display panel is as follows: Figure 5 and Figure 7 For example, the conductive bridge 125, the first touch electrode 121, the second touch electrode 122, etc. are directly formed on the package cover 20 of the display substrate 110. In this way, compared with the attachment method, the TOE touch display panel simplifies the preparation process of the entire display device 1 and is conducive to the lightweight design of the display device 1.

[0099] It should be noted that the structure of the display device 1 disclosed in the present invention is not limited to the structure in the above embodiment. For example, the display substrate 110 may include a substrate, a liquid crystal display layer located on the substrate, and a packaging cover plate 20 located on the side of the liquid crystal display layer away from the substrate. The packaging cover plate 20 may be a glass cover plate. The deflection angle of the liquid crystal is controlled by adjusting the electrode voltage of the display device 1, and a color display is achieved in conjunction with a color filter and a polarizer. For another example, the display substrate 110 may include a substrate and a light-emitting organic light-emitting diode layer, i.e., an OLED layer, located on the substrate, and a packaging cover plate 20 located on the side of the OLED layer away from the display substrate. The packaging cover plate 20 may be a thin film packaging layer, such as an inorganic-organic-inorganic laminated thin film packaging layer. For another example, the first touch electrode 121 and the second touch electrode 122 in the touch structure 120 may be arranged inside the thin film packaging layer, such as between an inorganic packaging film layer and an organic packaging film layer.

[0100] In an embodiment of the present disclosure, the display device may be an organic light emitting diode display device, a liquid crystal display device, an electronic paper display device, or the like.

[0101] For example, the display device in the embodiments of the present disclosure may be any product or component with a display function, such as a television, a digital camera, a mobile phone, a watch, a tablet computer, a laptop computer, a navigator, or the like.

[0102] It should be noted that the embodiments of the present disclosure do not describe all structures of the above-mentioned display device. To realize the necessary functions of the display device, those skilled in the art may set other structures according to specific application scenarios.

[0103] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A touch display panel, characterized in that: include: A display substrate, comprising a display area and a non-display area located outside the display area; A functional chip, located on the display substrate and in the non-display area; A functional wiring is located in the non-display area and is arranged around the display area, the functional wiring includes a first functional wiring and a second functional wiring that are spaced apart from each other and arranged opposite to each other, one end of the first functional wiring and one end of the second functional wiring are respectively connected to the functional chip, and a free end of the first functional wiring and a free end of the second functional wiring constitute a detection capacitor; as well as The multiplexer is controlled by the functional chip to transmit a detection signal or a preset signal to the first functional wiring and the second functional wiring.

2. The touch display panel according to claim 1, characterized in that: The multiplexer includes a first multiplexer and a second multiplexer, the detection signal includes a touch signal and a sensing signal, the sensing signal is used to detect the capacitance value of the detection capacitor, and The first multiplexer is used to implement the gating of the touch signal, and the second multiplexer is used to implement the gating of the sensing signal; Preferably, the function chip includes a touch chip, the first multiplexer includes a first output signal line connected to the first function line, and a first input signal line, a second input signal line and a first control signal line respectively connected to the touch chip, the first input signal line is used to transmit the preset signal, the second input signal line is used to transmit the touch signal, and the first control signal line is used to transmit a selection signal of the first input signal line and the second input signal line; The second multiplexer includes a second output signal line connected to the second functional line and a third input signal line, a fourth input signal line and a second control signal line respectively connected to the touch chip, the third input signal line is used to transmit the preset signal, the fourth input signal line is used to transmit the sensing signal, and the second control signal line is used to transmit the selection signal of the third input signal line and the fourth input signal line.

3. The touch display panel according to claim 2, characterized in that: The touch display panel further includes a touch structure, wherein the touch structure includes a plurality of first touch electrodes and a plurality of second touch electrodes located in the display area, wherein the first touch electrodes and the second touch electrodes intersect each other to form a touch capacitor, and A first signal line and a second signal line, one end of which is connected to the first touch electrode and the second touch electrode respectively, and the other end of which is connected to the touch chip respectively; Preferably, the first signal line and the second signal line are located in the non-display area; Preferably, the first functional wiring and the second functional wiring are formed in the same layer and with the same material as at least a portion of the touch structure; Preferably, the first functional wiring and the second functional wiring are respectively arranged around the display area to form a semi-enclosed space, and the display area is located in the semi-enclosed space.

4. The touch display panel according to claim 3, characterized in that: The first functional wiring and the second functional wiring are in the same layer and made of the same material, and the free end of the first functional wiring and the free end of the second functional wiring are spaced and staggered to form a preset pattern; Preferably, the preset pattern is a "Z" type or a "two" type.

5. The touch display panel according to claim 3, characterized in that: The first functional wiring and the second functional wiring are in different layers, and in a direction perpendicular to the display substrate, a free end of the first functional wiring and a free end of the second functional wiring at least partially overlap.

6. The touch display panel according to claim 3, characterized in that: The first touch control electrode and the second touch control electrode are arranged in the same layer, the touch control structure further comprises a plurality of conductive bridges, the conductive bridges are used to connect the first touch control electrode and the second touch control electrode, and The first functional wiring is in the same layer and made of the same material as the first touch electrode and one of the conductive bridges, and the second functional wiring is in the same layer and made of the same material as the other of the first touch electrode and the conductive bridge; or, The first functional wiring and the second functional wiring are in the same layer and made of the same material as the first touch electrode and / or the conductive bridge.

7. The touch display panel according to claim 3, characterized in that: The first touch control electrodes and the second touch control electrodes are arranged in different layers, and The first functional wiring is in the same layer and made of the same material as one of the first touch electrode and the second touch electrode, and the second functional wiring is in the same layer and made of the same material as the other of the first touch electrode and the second touch electrode; or, The first functional wiring and the second functional wiring are in the same layer and made of the same material as the first touch electrode and / or the second touch electrode.

8. The touch display panel according to any one of claims 1 to 7, characterized in that: The functional wiring is a ground wire.

9. A method for detecting cracks in a touch display panel, characterized in that: Obtain a touch display panel, wherein the touch display panel is the touch display panel according to any one of claims 1 to 8; Disconnecting the first function wiring and the second function wiring in the touch display panel from the transmission channel of the preset signal respectively, so that the first function wiring and the transmission channel of the touch signal and the second function wiring and the transmission channel of the sensing signal are respectively connected, and the sensing signal is used to detect the capacitance value of the detection capacitor formed by the free ends of the first function wiring and the second function wiring; Obtaining a capacitance value of the detection capacitor; Whether the touch display panel has cracks is determined according to the capacitance value of the detection capacitor.

10. A display device, characterized in that: A touch display panel comprising any one of claims 1-8.

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