Touch panel, display device, and detection method

Abstract

The application discloses a touch panel, a display device and a detection method. The touch panel comprises a touch area and a frame area arranged on at least one side of the touch area. The touch panel comprises a substrate. A first touch electrode is arranged on one side of the substrate and located in the touch area. A first touch trace is arranged on one side of the substrate and located in the frame area. The number of the first touch traces is plural. Two ends of the first touch electrode are electrically connected to at least one first touch trace. The first touch trace electrically connected to the two ends of the first touch electrode is used to be electrically connected to a touch chip. A detection trace is arranged on one side of the substrate and located in the frame area. The detection trace is arranged in a layer different from the first touch trace. The orthographic projection of at least one first touch trace electrically connected to the first touch electrode and the detection trace on the substrate is arranged in at least partial overlap. The detection trace is used to be connected to a fixed signal or electrically connected to the touch chip. The above arrangement can timely detect the yield of the touch panel.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a touch panel, display device and testing method. Background Technology

[0002] Currently, screen manufacturing processes include Cell Test (CT) to determine if there are any defects in the display screen.

[0003] However, the current testing methods have low accuracy, which affects the detection of display panel yield. Summary of the Invention

[0004] This application mainly provides a touch panel, a display device, and a testing method, which can improve the accuracy of display panel yield detection.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is as follows: a touch panel is provided, the touch panel includes a touch area and a frame area disposed around the touch area, the touch panel includes a substrate, a first touch electrode, a first touch trace and a detection trace; wherein, the first touch electrode is disposed on one side of the substrate and located in the touch area; the first touch trace is disposed on one side of the substrate and located in the frame area, the number of first touch traces is multiple, at least one first touch trace is electrically connected to each end of the first touch electrode, and the first touch trace electrically connected to both ends of the first touch electrode is used for electrical connection with a touch chip; the detection trace is disposed on one side of the substrate and located in the frame area, the detection trace and the first touch trace are disposed on different layers, the orthographic projections of at least one first touch trace electrically connected to the first touch electrode and the detection trace on the substrate at least partially overlap, and the detection trace is used to access a fixed signal or to be electrically connected to a touch chip.

[0006] The orthographic projections of the first touch traces electrically connected to both ends of the first touch electrode on the substrate are at least partially overlapped with the orthographic projections of the detection traces on the substrate.

[0007] Preferably, the detection trace includes a first detection section and a second detection section that are insulated from each other. The first detection section is used to receive a fixed signal, and the second detection section is used to be electrically connected to the touch chip.

[0008] Preferably, the orthographic projections of the first detection unit and the second detection unit on the substrate are respectively arranged to at least partially overlap with the orthographic projections of different first touch traces on the substrate.

[0009] The number of first touch electrodes is multiple, and the orthographic projection of the first touch trace electrically connected to at least one end of any first touch electrode on the substrate and the orthographic projection of the detection trace on the substrate are at least partially overlapped.

[0010] Preferably, the orthographic projection of the first touch trace electrically connected to both ends of any first touch electrode on the substrate is at least partially overlapped with the orthographic projection of the detection trace on the substrate.

[0011] Preferably, the detection traces are arranged around the touch area.

[0012] The detection traces include a first detection sub-trace, a second detection sub-trace, and a bus. The first detection sub-trace and the second detection sub-trace are spaced apart and are both electrically connected to the bus, which is used to connect to the touch chip. The orthographic projections of the first touch trace electrically connected to the first end of the first touch electrode and the first detection sub-trace on the substrate at least partially overlap. The orthographic projections of the first touch trace electrically connected to the second end of the first touch electrode and the second detection sub-trace on the substrate at least partially overlap.

[0013] Preferably, the first detection sub-trace is arranged around the touch area, and the second detection sub-trace and the bus are arranged on the same side of the touch area.

[0014] The system comprises multiple first touch electrodes that extend along a first direction and are spaced apart along a second direction. It also comprises multiple first and second detection sub-lines. Each first touch electrode includes a first target touch electrode and a second target touch electrode. The orthographic projections of the first touch electrodes electrically connected to the first ends of the first and second target touch electrodes on the substrate overlap with the orthographic projections of the same first detection sub-line on the substrate. Alternatively, the orthographic projections of the first touch lines electrically connected to the second ends of the first and second target touch electrodes on the substrate overlap with the orthographic projections of the same second detection sub-line on the substrate.

[0015] Preferably, the first target touch trace and the second target touch trace are symmetrically arranged about the middle of the plurality of first touch traces in the second direction.

[0016] The system includes multiple first detection sub-lines arranged in a concentric ring around the periphery of the touch area, and multiple second detection sub-lines spaced apart on one side of the touch area. The orthographic projections of the first touch lines electrically connected to the first ends of two adjacent first touch electrodes on the substrate overlap with the orthographic projections of the two adjacent first detection sub-lines on the substrate. And / or, the orthographic projections of the first touch lines electrically connected to the second ends of two adjacent first touch electrodes on the substrate overlap with the orthographic projections of the two adjacent second detection sub-lines on the substrate.

[0017] The touch panel includes a second touch electrode that intersects with and is insulated from the first touch electrode.

[0018] Preferably, the touch panel includes a first touch layer and a second touch layer. The first touch layer is disposed on one side of the substrate, and a first touch trace is formed in the first touch layer. The second touch layer is disposed on one side of the substrate and is insulated from the first touch layer, and a detection trace is formed in the second touch layer. A first touch electrode is formed in the first touch layer, and a second touch electrode is formed in the second touch layer. Alternatively, the first touch electrode includes a plurality of electrically connected first touch electrode blocks spaced apart along a first direction, and the second touch electrode includes a plurality of electrically connected second touch electrode blocks spaced apart along a second direction. The first and second directions intersect, and both the first and second touch electrode blocks are formed in the first touch layer. Adjacent first touch electrode blocks / second touch electrode blocks are electrically connected via a bridging member formed in the second touch layer.

[0019] Preferably, the test traces are made of the same material as the bridging component.

[0020] Preferably, the second touch layer and the first touch layer are stacked sequentially in the direction away from the substrate.

[0021] Preferably, the first touch electrode is a driving electrode and the second touch electrode is a sensing electrode.

[0022] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide a display device, which includes the touch panel described in the above embodiments.

[0023] To solve the above-mentioned technical problems, another technical solution adopted in this application is: to provide a detection method, which is applied to a touch panel. The touch panel includes a touch area and a frame area disposed on at least one side of the touch area. The touch panel includes a substrate, a first touch electrode, a first touch trace, and a detection trace. The system comprises: a first touch electrode disposed on one side of the substrate and located in the touch area; a first touch trace disposed on one side of the substrate and located in the border area; multiple first touch traces; each end of the first touch electrode is electrically connected to at least one first touch trace; and the first touch traces electrically connected to both ends of the first touch electrode are used for electrical connection with the touch chip; a detection trace disposed on one side of the substrate and located in the border area; the detection trace and the first touch trace are disposed on different layers; the orthographic projections of at least one first touch trace electrically connected to the first touch electrode and the detection trace on the substrate at least partially overlap; and a detection method comprising: the touch chip charging the first touch electrode through the first touch trace; the touch chip determining whether an open circuit has occurred in the first touch trace electrically connected to the first touch electrode based on the signal output by the detection trace; wherein the detection trace is electrically connected to the touch chip; or, the touch chip determining whether an open circuit has occurred in the first touch trace electrically connected to the first touch electrode based on the signal returned by the first touch trace; wherein the detection trace is used to receive a fixed signal.

[0024] The steps of determining whether the first touch traces electrically connected to the first touch electrode have an open circuit on the substrate, and determining whether the first touch traces electrically connected to the first touch electrode have an open circuit based on the signal output by the detection trace, include: determining the capacitance value between the detection trace and the first touch trace based on the signal output by the detection trace; determining that the first touch traces electrically connected to the first touch electrode have no open circuit if the capacitance value is within a first preset range; determining that the first touch traces electrically connected to the first touch electrode have an open circuit if the capacitance value is within a second preset range; and determining that the first touch trace electrically connected to the first end of the first touch electrode has an open circuit if the capacitance value is within a third preset range.

[0025] The beneficial effects of this application are as follows: In this application, when the first touch trace electrically connected to at least one end of the first touch electrode and the detection trace are at least partially overlapped on the substrate, there is a coupling capacitance between the first touch trace and the detection trace. The detection trace is used to electrically connect with the touch chip. The detection trace transmits the electrical signal generated by the coupling capacitance to the touch chip. The touch chip processes the received electrical signal to obtain capacitance information and determines whether the first touch trace is open-circuited based on the capacitance information. This effectively detects whether the first touch trace is open-circuited, thus ensuring the yield of the touch panel. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0027] Figure 1 This is a schematic diagram of a prior art embodiment of a touch panel;

[0028] Figure 2 This is a schematic diagram of one embodiment of the touch panel in this application;

[0029] Figure 3 This is a cross-sectional structural diagram of one embodiment of the touch panel bezel area in this application;

[0030] Figure 4 A schematic diagram of the current in one embodiment of normal charging of the touch panel in this application;

[0031] Figure 5 A schematic diagram of the current in one embodiment of abnormal charging of the touch panel in this application;

[0032] Figure 6 This is a schematic diagram of another embodiment of the touch panel in this application;

[0033] Figure 7 This is a flowchart illustrating one embodiment of the detection method in this application;

[0034] Explanation of reference numerals in the attached figures: 1 First touch electrode; 11 First end; 12 Second end; 13 First touch trace; 14 First target touch electrode; 15 Second target touch electrode; 16 First target touch trace; 17 Second target touch trace; 18 First touch layer; 2 Second touch electrode; 21 Detection trace; 22 First detection sub-trace; 23 Second detection sub-trace; 24 Bus; 25 Second touch layer; 10 Touch area; 20 Border area; 3 Substrate; 4 Insulating layer; 5 Flexible circuit board; 6 Touch chip; X First direction; Y Second direction. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0037] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0038] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0040] Please see Figure 1 Currently, display panels, such as organic light-emitting diodes (OLEDs), use 2T1R, 1T2R, or 2T2R routing designs to achieve high touch reporting rates. For example, the sensing touch electrode (TX) has routing at both ends, while the receiving touch electrode (RX) has routing at only one end. Since the number of available TX channels in the touch chip 6 (Touch IC) is limited, the two sets of TX routings electrically connected to the same touch electrode are shorted at the flexible printed circuit board 5 (Flexible Printed Circuit, FPC) and then connected to the interface of the Touch IC corresponding to the same set of TX routings. That is, one TX routing interface of the Touch IC controls the two sets of TX routings of the touch panel.

[0041] During the manufacturing process of mobile phone screen modules, since the TX traces from both ends of the touch panel correspond to the same group of TX trace interfaces of the Touch IC, if a single-ended TX trace is open or broken, it is impossible to detect the presence of a single-ended open TX trace through the channel mutual capacitance value data collected by the Touch IC.

[0042] Because the TX connections of the traces at both ends of the OLED mobile phone screen touch panel with the 2T1R routing design are to the same interface of the Touch IC, the inventors of this application discovered through long-term research during the module production process that when the touch panel has a TX single-end open defect, the single-end open TX channel cannot be detected by the mutual capacitance value data collected by the Touch IC. Therefore, there is a problem that defective touch products (TX single-end open defects) are easily leaked.

[0043] Furthermore, in existing technologies, during the display panel manufacturing stage, the TX traces on both sides of the touch sensor electrode are connected to the screen's touch-sensitive touch test pads (pins). A CT testing fixture is used to connect the CT test pins to test the impedance between the TX traces on both sides of the touch sensor electrode. If the impedance is too high, there is an open defect. After testing, the screen's CT test pins are removed through a cutting process, making it impossible to subsequently test the single-end open condition of the TX traces on both sides of the touch sensor electrode. The above testing method has the problems of high cost and low accuracy. In addition, after removing the CT test pins, it is impossible to test whether the touch traces are open.

[0044] To address the aforementioned problems, this application proposes the following solution:

[0045] Please see Figure 2 and Figure 3 This application provides a touch panel, which includes a touch area 10 and a frame area 20 disposed around the touch area 10. The touch panel includes a substrate 3, a first touch electrode 1, a first touch trace 13, and a detection trace 21. The first touch electrode 1 is disposed on one side of the substrate 3 and located in the touch area 10. The first touch trace 13 is disposed on one side of the substrate 3 and located in the frame area 20. There are multiple first touch traces 13. At least one first touch trace 13 is electrically connected to each end of the first touch electrode 1, and the first touch traces 13 electrically connected to both ends of the first touch electrode 1 are used to electrically connect to a touch chip 6. The detection trace 21 is disposed on one side of the substrate 3 and located in the frame area 20. The detection trace 21 and the first touch trace 13 are disposed on different layers. The orthographic projections of at least one first touch trace 13 electrically connected to the first touch electrode 1 and the detection trace 21 on the substrate 3 at least partially overlap. The detection trace 21 is used to receive a fixed signal or to electrically connect to the touch chip 6.

[0046] Specifically, the touch panel also includes a second touch electrode 2, which intersects with and is insulated from the first touch electrode 1. The first touch electrode 1, the second touch electrode 2, the first touch trace 13, and the detection trace 21 are all disposed on the same side of the substrate 3. The first touch electrode 1 and the second touch electrode 2 are both located in the touch area 10, used to generate electrical signals based on external touches. The electrical signals are transmitted to the touch chip 6 through the first touch trace 13 located at the edge. The touch chip 6 processes the touch signals and generates control signals that are sent back to the first touch electrode 1 and the second touch electrode 2, forming complete touch control. Simultaneously, both ends of the first touch electrode 1 are each electrically connected to at least one first touch trace 13. For example, each end of the first touch electrode 1 is electrically connected to a first touch trace 13, or each end of the first touch electrode 1 is electrically connected to multiple first touch traces 13. It is understood that by configuring each end of the first touch electrode 1 to be electrically connected to multiple first touch traces 13, the charging speed of the touch chip for the first touch electrode 1 can be improved. In the accompanying drawings of this application, the illustrations are provided with each end of the first touch electrode 1 being electrically connected to two first touch traces 13.

[0047] This application also includes a detection trace 21, which is disposed on one side of the substrate 3 and located in the border area 20, such as... Figure 3 As shown, the detection trace 21 and the first touch trace 13 are disposed on different layers. The first touch trace 13, which is electrically connected to at least one end of the first touch electrode 1, and the detection trace 21 are disposed on the substrate 3 with at least partial overlap in their orthogonal projections.

[0048] In one embodiment, the detection trace 21 is used for electrical connection with the touch chip 6. The first touch trace 13, electrically connected to at least one end of the first touch electrode 1, and the detection trace 21 are at least partially overlapped on the substrate 3 in their orthogonal projections. Both the first touch trace 13 and the detection trace 21 are made of conductive material, resulting in a coupling capacitance between them. The detection trace 21 is used for electrical connection with the touch chip 6, transmitting electrical signals generated by the coupling capacitance to the touch chip 6. The touch chip 6 processes the received electrical signals to obtain capacitance information and determines whether the first touch trace 13 is open-circuited based on this information. The principle by which the touch chip 6 can determine whether the first touch trace 13 is open-circuited based on the capacitance between the first touch trace 13 and the detection trace 21 is as follows:

[0049] Specifically, please refer to Figure 4 and Figure 5The touch chip 6 is connected to the first touch electrode 1 via the first touch trace 13. Both the first touch trace 13 connected to the first end 11 of the first touch electrode 1 and the first touch trace 13 connected to the second end 12 of the first touch electrode 1 receive electrical signals, forming a charging path. When the first touch trace 13 is not open-circuited, the charging path of the touch chip 6 to the first touch electrode 1 is as follows: Figure 4 As shown, when the first touch trace 13 is broken, the charging path of the touch chip 6 to charge the first touch electrode 1 is as follows: Figure 5 As shown. Specifically, to measure the charging speed of a capacitor, a time constant t is often used. The time constant is the product of the impedance R and the capacitance C, i.e., t = RC, where R is the impedance of the charging path and C is the capacitance. Therefore, for the same charging time, i.e., when t is the same, the larger the impedance R of the charging path, the smaller the capacitance C.

[0050] like Figure 4 and Figure 5 As can be seen from the comparison, when the first touch trace 13, which is electrically connected to the first touch electrode 1, is open, the charging path becomes longer compared to the normal situation. This results in a higher impedance R in the charging path and a smaller capacitance (C) between the first touch trace 13 and the detection trace 21. Therefore, when the touch chip 6 detects a decrease in capacitance between the first touch trace 13 and the detection trace 21 through the detection trace 21, it can determine that an open circuit has occurred in the first touch trace 13, which is electrically connected to the first touch electrode 1.

[0051] In another embodiment, the detection trace 21 can be connected to a fixed signal, for example, it can be grounded, in which case the detection trace 21 can be a ground trace. In one embodiment, the first touch trace 13 transmits the electrical signal generated by the coupling capacitor to the touch chip 6, and the principle by which the touch chip 6 determines whether the first touch trace 13 is single-ended open is as described above. That is, at this time, the touch chip 6 determines whether the first touch trace 13 has an open circuit based on the self-capacitance signal between the first touch trace 13 and the detection trace 21.

[0052] Therefore, as can be seen from the above, the present application sets at least one first touch trace 13 electrically connected to the first touch electrode 1 and the detection trace 21 to be at least partially overlapped on the substrate 3. The signal output by the detection trace 21 can be used to determine whether the first touch trace 13 electrically connected to the first touch electrode 14 has an open circuit. The detection method is simple and efficient and can ensure product yield.

[0053] Please continue reading. Figure 2 and Figure 3The orthographic projections of the first touch traces 13 electrically connected to both ends of the first touch electrode 1 on the substrate 3 at least partially overlap with the orthographic projections of the detection traces 21 on the substrate 3. Specifically, by configuring the orthographic projections of the first touch traces 13 electrically connected to both ends of the first touch electrode 1 on the substrate 3 at least partially overlap with the orthographic projections of the detection traces 21 on the substrate 3, it is possible to detect whether both of the first touch traces 13 electrically connected to both ends of the first touch electrode 1 have been disconnected.

[0054] It should be noted that in other embodiments, the orthographic projections of the first touch trace 13 electrically connected to one end of the first touch electrode 1 on the substrate 3 may be set to at least partially overlap with the orthographic projections of the detection trace 21 on the substrate 3. In this case, only whether the first touch trace 13 electrically connected to one end of the first touch electrode 1 has an open circuit can be detected.

[0055] In one embodiment, the detection trace 21 includes a first detection section and a second detection section that are insulated from each other. The first detection section is used to receive a fixed signal, and the second detection section is used to be electrically connected to the touch chip 6. Specifically, the first detection section can receive a fixed signal, and the second detection section is used to be electrically connected to the touch chip 6. In this case, the touch chip 6 can determine whether the first touch trace 13 is open-circuited based on the self-capacitance signal between the first detection section and the first touch trace 13, or it can determine whether the first touch trace 13 is open-circuited based on the mutual capacitance signal between the second detection section and the first touch trace 13.

[0056] In one embodiment, the orthographic projections of the first detection unit and the second detection unit on the substrate are respectively at least partially overlapped with the orthographic projections of different first touch traces 13 on the substrate. Specifically, this arrangement allows for the detection of whether different first touch traces 13 are open-circuited, i.e., the first detection unit can detect whether one first touch trace 13 is open-circuited, and the second detection unit can detect whether another first touch trace 13 is open-circuited.

[0057] Please continue reading. Figure 2 and Figure 3 The number of first touch electrodes 1 is multiple, and the orthographic projection of the first touch trace 13 electrically connected to at least one end of any first touch electrode 1 on the substrate 3 and the orthographic projection of the detection trace 21 on the substrate 3 are at least partially overlapped.

[0058] Specifically, when there are multiple first touch electrodes 1, the orthographic projection of the first touch trace 13 electrically connected to at least one end of each first touch electrode 1 on the substrate 3 is at least partially overlapped with the orthographic projection of the detection trace 21 on the substrate 3, so that for any first touch electrode 1, it can be detected whether the first touch trace 13 electrically connected to it has an open circuit.

[0059] The first touch electrode 1 has a first end 11 and a second end 12. In one application scenario, the orthographic projections of the first touch traces 13 connected to the first ends 11 of all the first touch electrodes 1 on the substrate 3 and the orthographic projections of the detection traces 21 on the substrate 3 are at least partially overlapped. In this case, based on the electrical signal transmitted to the touch chip 6 by the detection traces 21, the touch chip 6 can determine whether the first touch traces 13 connected to the first ends 11 of all the first touch electrodes 1 are open-circuited. Alternatively, in another application scenario, the orthographic projections of the first touch traces 13 connected to the second ends 12 of all the first touch electrodes 1 on the substrate 3 and the orthographic projections of the detection traces 21 on the substrate 3 are at least partially overlapped. In this case, based on the electrical signal transmitted to the touch chip 6 by the detection traces 21, the touch chip 6 can determine whether the first touch traces 13 connected to the second ends 12 of all the first touch electrodes 1 are open-circuited.

[0060] In one embodiment, the orthographic projections of the first touch traces 13 connected to the first end 11 of a portion of the first touch electrode 1 on the substrate 3 and the orthographic projections of the detection traces 21 on the substrate 3 are at least partially overlapped. In this case, based on the electrical signal transmitted to the touch chip 6 by the detection traces 21, the touch chip 6 can determine whether the first touch traces 13 connected to the first end 11 of that portion of the first touch electrode 1 are open-circuited. Simultaneously, the orthographic projections of the first touch traces 13 connected to the second end 12 of the remaining portion of the first touch electrode 1 on the substrate 3 and the orthographic projections of the detection traces 21 on the substrate 3 are at least partially overlapped. In this case, based on the electrical signal transmitted to the touch chip 6 by the detection traces 21, the touch chip 6 can determine whether the first touch traces 13 connected to the second end 12 of the remaining portion of the first touch electrode 1 are open-circuited.

[0061] In one embodiment, the orthographic projection of the first touch trace 13 electrically connected to both ends of any first touch electrode 1 on the substrate 3 is at least partially overlapped with the orthographic projection of the detection trace 21 on the substrate 3; at this time, according to the electrical signal transmitted to the touch chip 6 by the corresponding detection trace 21, the touch chip 6 can determine whether the first touch trace 13 connected to both ends of all the first touch electrodes 1 is open-circuited.

[0062] Please continue reading. Figure 2 and Figure 3The detection trace 21 is arranged around the touch area 10. The arrangement of the detection trace 21 around the touch area 10 facilitates connection with the touch chip 6 to achieve electrical signal conduction, and also facilitates the arrangement of the orthographic projection of the first touch trace 13 electrically connected to the first touch electrode 1 on the substrate 3 to at least partially overlap with the orthographic projection of the detection trace 21 on the substrate 3.

[0063] Please continue reading. Figure 2 The detection trace 21 includes a first detection sub-trace 22, a second detection sub-trace 23, and a bus 24. The first detection sub-trace 22 and the second detection sub-trace 23 are spaced apart and electrically connected to the bus 24, which is used to connect to the touch chip 6. Specifically, the first detection sub-trace 22 and the second detection sub-trace 23 are spaced apart to facilitate corresponding configuration with different first touch traces 13. Both the first detection sub-trace 22 and the second detection sub-trace 23 are electrically connected to the bus 24, which is used to connect to the touch chip 6. This design only requires one interface of the touch chip 6 to transmit signals with the detection trace 21, without increasing the number of interfaces of the touch chip 6, thus not increasing the size of the touch chip 6.

[0064] Specifically, the orthographic projections of the first touch trace 13 electrically connected to the first end 11 of the first touch electrode 1 on the substrate 3 and the orthographic projections of the first detection sub-trace 22 on the substrate 3 are at least partially overlapping. Similarly, the orthographic projections of the first touch trace 13 electrically connected to the second end 12 of the first touch electrode 1 on the substrate 3 and the orthographic projections of the second detection sub-trace 23 on the substrate 3 are at least partially overlapping. For the same first touch electrode 1, the first touch trace 13 and the first detection sub-trace 22 electrically connected to its first end 11 are correspondingly arranged, and a coupling capacitor exists between them, facilitating the touch chip's determination of whether the first touch trace 13 is open-circuited. The first touch trace 13 and the second detection sub-trace 23 electrically connected to its second end 12 are correspondingly arranged, and a coupling capacitor exists between the second detection sub-trace 23 and the first touch trace 13, facilitating the touch chip's determination of whether the first touch trace 13 is open-circuited. By combining the first detection sub-line 22 and the second detection sub-line 23, it is possible to determine whether the first touch line 13 connected to the same first touch electrode 1 is open-circuited.

[0065] In one embodiment, a first detection sub-line 22 is disposed around the touch area 10, and a second detection sub-line 23 and a bus 24 are disposed on the same side of the touch area 10. Specifically, the first detection sub-line 22 and the first touch line 13 electrically connected to the first end 11 of the first touch electrode 1 are correspondingly disposed, and the first touch line 13 at least surrounds a portion of the touch area 10. The second detection sub-line 23 and the first touch line 13 electrically connected to the second end 12 of the first touch electrode 1 are correspondingly disposed, and the connection path between the first touch line 13 and the touch chip 6 is short, and it is located on one side of the touch area 10. Since the bus 24 is electrically connected to the touch chip 6, disposing both the sub-line and the second detection sub-line 23 on the same side of the touch area 10 facilitates the electrical connection between the bus 24 and the touch chip 6, and is also convenient for fabrication.

[0066] Please see Figure 6 In other embodiments, the detection trace 21 can also be designed as a continuous structure surrounding the touch area 10. In this case, the orthographic projection of the first touch trace 13 on the substrate 3 and the orthographic projection of the detection trace 21 on the substrate 3 at least partially overlap. The first touch trace 13 and the detection trace 21 are arranged opposite each other, and a coupling capacitance is generated between them. At this time, the detection trace 21 can transmit the electrical signal generated during the power-on operation to the touch chip 6. The touch chip 6 determines whether the first touch trace 13 is open-circuited based on the electrical signal, thereby improving the detection efficiency of the first touch trace 13. At the same time, the fabrication process of the detection trace 21 is simplified, which is beneficial for fabrication.

[0067] Please continue reading. Figure 2 There are multiple first touch electrodes 1, which extend along the first direction X. The multiple first touch electrodes 1 are arranged at intervals in the second direction Y. At the same time, there are multiple first detection sub-lines 22 and multiple second detection sub-lines 23. The multiple first touch electrodes 1 include a first target touch electrode 14 and a second target touch electrode 15. The orthographic projection of the first touch line 13 electrically connected to the first end 11 of the first target touch electrode 14 and the second target touch electrode 15 on the substrate 3 overlaps with the orthographic projection of the same first detection sub-line 22 on the substrate 3.

[0068] Specifically, the touch panel includes multiple first touch electrodes 1 extending along a first direction X, and the multiple first touch electrodes 1 are arranged in an orderly manner along a second direction Y. The detection traces 21 also include multiple first detection sub-traces 22 and multiple second detection sub-traces 23. The first touch electrodes 1 include a first target touch electrode 14 and a second target touch electrode 15, wherein the orthographic projection of the first touch trace 13 electrically connected to the first end 11 of the first target touch electrode 14 and the second target touch electrode 15 on the substrate 3 overlaps with the orthographic projection of the same first detection sub-traces 22 on the substrate 3, so that the on / off status of the first touch trace 13 electrically connected to the first end 11 of the first target touch electrode 14 and the second target touch electrode 15 can be determined through the same first detection sub-traces 22. In one embodiment, the orthographic projection of the first touch electrode 1 electrically connected to the second end 12 of the first target touch electrode 14 and the second target touch electrode 15 on the substrate 3 overlaps with the orthographic projection of the same second detection sub-line 23 on the substrate 3, so that the on / off status of the first touch line 13 electrically connected to the second end 12 of the first target touch electrode 14 and the second target touch electrode 15 can be determined by the same second detection sub-line 23.

[0069] In one embodiment, the first target touch trace 16 and the second target touch trace 17 are symmetrically arranged about the middle of the plurality of first touch traces 13 in the second direction Y. This design allows the first target touch traces 16 corresponding to the first target touch electrode 14 and the second target touch electrode 15 to detect their on / off status through the same first detection sub-trace 22, and allows the second target touch traces 17 corresponding to the first target touch electrode 14 and the second target touch electrode 15 to detect their on / off status through the same second detection sub-trace 23. Furthermore, during the detection process, the touch chip 6 performs time-division detection on the first touch electrode 1, charging only one first touch electrode 1 at a time. At this time, the on / off status of the first touch traces 13 connected to both ends of the detected first touch electrode 1 can be determined based on the signal from the detection trace 21.

[0070] Please continue reading. Figure 2 Multiple first detection sub-lines 22 are arranged in a concentric ring around the periphery of the touch area 10, and multiple second detection sub-lines 23 are arranged at intervals on one side of the touch area 10. The first detection sub-lines 22 are arranged around the touch area 10, and the second detection sub-lines 23 are located on one side of the touch area 10, which is conducive to the compact design of the detection lines 21 and saves the occupied frame volume.

[0071] In this configuration, the orthographic projections of the first touch lines 13 electrically connected to the first ends 11 of two adjacent first touch electrodes 1 on the substrate 3 overlap with the orthographic projections of the two adjacent first detection sub-lines 22 on the substrate 3. The spacing between adjacent first touch lines 13 and the spacing between adjacent first detection sub-lines 22 are equal, which is beneficial for achieving an orderly arrangement between the first touch lines 13 and the first detection sub-lines 22 electrically connected to the first ends 11 of the first touch electrodes 1, and facilitates design and fabrication.

[0072] In one embodiment, the orthographic projections of the first touch traces 13 electrically connected to the second ends 12 of two adjacent first touch electrodes 1 on the substrate 3 overlap with the orthographic projections of the two adjacent second detection sub-traces 23 on the substrate 3. Specifically, the spacing between adjacent first touch traces 13 and the spacing between adjacent second detection sub-traces 23 are equal, which facilitates the orderly arrangement of the first touch traces 13 and the second detection sub-traces 23 electrically connected to the first ends 11 of the first touch electrodes 1, and is convenient for design and fabrication.

[0073] In one embodiment, see Figure 3 The touch panel includes a first touch layer 18 and a second touch layer 25. The first touch layer 18 is disposed on one side of the substrate 3, and a first touch trace 13 is formed in the first touch layer 18. The second touch layer 25 is disposed on one side of the substrate 3 and is insulated from the first touch layer 18. A detection trace 21 is formed in the second touch layer 25. Specifically, this arrangement can ensure that the detection trace 21 and the first touch trace 13 are disposed on different layers and are insulated from each other.

[0074] In one embodiment, the first touch electrode 1 is formed in the first touch layer 18, and the second touch electrode 2 is formed in the second touch layer 25. That is, the first touch electrode 1 and the second touch electrode 2 are disposed in different layers.

[0075] In another embodiment, the first touch electrode 1 includes a plurality of electrically connected first touch electrode blocks spaced apart along a first direction X, and the second touch electrode 2 includes a plurality of electrically connected second touch electrode blocks spaced apart along a second direction Y. The first direction X and the second direction Y intersect. Both the first and second touch electrode blocks are formed in the first touch layer 18, and adjacent first or second touch electrode blocks are electrically connected via a bridging member formed in the second touch layer 25. Specifically, unlike the above embodiment, the first touch electrode 1 and the second touch electrode 2 are partially disposed in the same layer. Adjacent second touch electrode blocks can be electrically connected via a bridging member located in the second touch layer 25, thereby avoiding short circuits at the intersection of the first touch electrode 1 and the second touch electrode 2. Furthermore, the bridging member and the detection trace 21 are disposed in the same layer, thus allowing the addition of the detection trace 21 without increasing the thickness of the touch panel.

[0076] In one embodiment, the detection trace 21 and the bridging component are made of the same material, thus allowing both to be fabricated simultaneously using the same material, saving manufacturing steps and improving the production efficiency of the touch panel. In other embodiments, the detection trace 21 and the bridging component may be made of different materials, and this is not a limitation.

[0077] In one embodiment, see Figure 3 In the direction away from the substrate 3, the second touch layer 25 and the first touch layer 18 are stacked sequentially. Of course, in other embodiments, the first touch layer 18 and the second touch layer 25 can also be stacked sequentially in the direction away from the substrate 3.

[0078] In one embodiment, the first touch electrode 1 is a driving electrode, and the second touch electrode 2 is a sensing electrode. In other embodiments, the first touch electrode 1 may be a sensing electrode, and the second touch electrode 2 may be a driving electrode.

[0079] This application also provides a display device including the touch panel described in the above embodiments. The display device in the embodiments of this invention can be any product or component with touch functionality, such as electronic paper, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0080] Please see Figure 4 , Figure 5 and Figure 7 This application also provides a detection method applied to a touch panel. The touch panel includes a touch area 10 and a border area 20 disposed on at least one side of the touch area 10. The touch panel includes a substrate, a first touch electrode 1, a first touch trace 13, and a detection trace 21. The first touch electrode 1 is disposed on one side of the substrate and located in the touch area 10; the first touch trace 13 is disposed on one side of the substrate and located in the border area 20. There are multiple first touch traces 13. At least one first touch trace 13 is electrically connected to each end of the first touch electrode 1, and the first touch traces 13 electrically connected to both ends of the first touch electrode 1 are used for electrical connection with a touch chip 6; the detection trace 21 is disposed on one side of the substrate and located in the border area 20. The detection trace 21 and the first touch trace 13 are disposed on different layers. The orthographic projections of at least one first touch trace 13 electrically connected to the first touch electrode 1 and the detection trace 21 on the substrate at least partially overlap. The detection method includes:

[0081] S10: The touch chip 6 charges the first touch electrode 1 through the first touch trace 13.

[0082] The touch chip 6 is connected to the first touch electrode 1 through the first touch trace 13. The first touch trace 13 connected to the first end 11 of the first touch electrode 1 and the first touch trace 13 connected to the second end 12 of the first touch electrode 1 will receive electrical signals and form a charging path.

[0083] When the first touch trace 13 is not broken, the charging path of the touch chip 6 to charge the first touch electrode 1 is as follows: Figure 4 As shown, when the first touch trace 13 is broken, the charging path of the touch chip 6 to charge the first touch electrode 1 is as follows: Figure 5 As shown.

[0084] S20: The touch chip 6 determines whether the first touch line 13, which is electrically connected to the first touch electrode 1, has an open circuit based on the signal output by the detection line 21; wherein the detection line 21 is electrically connected to the touch chip 6; or, the touch chip 6 determines whether the first touch line 13, which is electrically connected to the first touch electrode 1, has an open circuit based on the signal returned by the first touch line 13; wherein the detection line 21 is used to receive a fixed signal.

[0085] Specifically, when the detection trace 21 is electrically connected to the touch chip 6, the touch chip 6 determines whether the first touch trace 13, which is electrically connected to the first touch electrode 1, has an open circuit based on the signal output by the detection trace 21; when the detection trace 21 is used to input a fixed signal, the touch chip 6 determines whether the first touch trace 13, which is electrically connected to the first touch electrode 1, has an open circuit based on the signal returned by the first touch trace 13.

[0086] To measure the charging speed of a capacitor, a time constant t is often used. The time constant is the product of the impedance R and the capacitance C, i.e., t = RC, where R is the impedance of the charging path and C is the capacitance. Therefore, for the same charging time, i.e., when t is the same, the larger the R of the charging path, the smaller the capacitance C.

[0087] Among them, such as Figure 4 and Figure 5 As can be seen from the comparison, when the first touch trace 13, which is electrically connected to the first touch electrode 1, is open, the charging path becomes longer compared to the normal situation. This results in a higher impedance R in the charging path and a smaller capacitance (C) between the first touch trace 13 and the detection trace 21. Therefore, when the touch chip 6 detects a decrease in capacitance between the first touch trace 13 and the detection trace 21 through the detection trace 21, it can determine that an open circuit has occurred in the first touch trace 13, which is electrically connected to the first touch electrode 1.

[0088] Wherein, when the orthographic projections of the first touch traces 13 electrically connected to both ends of the first touch electrode 1 on the substrate 3 at least partially overlap with the orthographic projections of the detection traces 21 on the substrate 3, step S20 includes:

[0089] S21: The touch chip 6 determines the capacitance value between the detection trace 21 and the first touch trace 13 based on the signal output by the detection trace 21.

[0090] S22: In response to the capacitance value being within the first preset range, it is determined that the first touch traces 13 electrically connected to both ends of the first touch electrode 1 have not experienced any open circuit phenomenon.

[0091] S23: In response to the capacitance value being within the second preset range, it is determined that the first touch trace 13 electrically connected to the first end 11 of the first touch electrode 1 has broken.

[0092] S24: In response to the capacitance value being within the third preset range, it is determined that the first touch trace 13, which is electrically connected to the second end 12 of the first touch electrode 1, has experienced an open circuit.

[0093] Specifically, the capacitance range between the first touch line 13 and the detection line 21 is obtained in advance when there is no open circuit in the first touch line 13 electrically connected to both ends of the first touch electrode 1, and this capacitance range is recorded as the first preset range; the capacitance range between the first touch line 13 and the detection line 21 is obtained when there is an open circuit in the first touch line 13 electrically connected to the first end 11 of the first touch electrode 1, but no open circuit in the first touch line 13 electrically connected to the second end 12, and this capacitance range is recorded as the second preset range; the capacitance range between the first touch line 13 and the detection line 21 is obtained when there is an open circuit in the first touch line 13 electrically connected to the second end 12 of the first touch electrode 1, but no open circuit in the first touch line 13 electrically connected to the first end 11, and this capacitance range is recorded as the third preset range. During the detection phase, if the capacitance value between the first touch trace 13 and the detection trace 21 is within a first preset range, it is determined that neither of the first touch traces 13 electrically connected to the two ends of the first touch electrode 1 is open-circuited. If the capacitance value between the first touch trace 13 and the detection trace 21 is within a second preset range, it is determined that the first touch trace 13 electrically connected to the first end 11 of the first touch electrode 1 is open-circuited. If the capacitance value between the first touch trace 13 and the detection trace 21 is within a third preset range, it is determined that the first touch trace 13 electrically connected to the second end 12 of the first touch electrode 1 is open-circuited. In this way, it is possible to detect whether the first touch trace 13 electrically connected to either end of the first touch electrode 1 is open-circuited.

[0094] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A touch panel, characterized by, The touch panel includes a touch area and a border area disposed on at least one side of the touch area, the touch panel including: substrate; The first touch electrode is disposed on one side of the substrate and located in the touch area; The first touch trace is disposed on one side of the substrate and located in the frame area. There are multiple first touch traces. At least one first touch trace is electrically connected to each end of the first touch electrode. The first touch traces electrically connected to the two ends of the first touch electrode are used to electrically connect to the touch chip. A detection trace is disposed on one side of the substrate and located in the frame area. The detection trace is disposed on a different layer from the first touch trace. At least one first touch trace electrically connected to the first touch electrode and the orthographic projection of the detection trace on the substrate at least partially overlap. The detection trace is used to access a fixed signal and / or to be electrically connected to the touch chip. There is a coupling capacitor between the detection trace and the first touch electrode. The touch chip determines whether the first touch trace is open-circuited based on the capacitance value of the coupling capacitor.

2. The touch panel according to claim 1, characterized in that, The orthographic projections of the first touch traces electrically connected to both ends of the first touch electrode on the substrate are at least partially overlapped with the orthographic projections of the detection traces on the substrate.

3. The touch panel according to claim 1, characterized in that, The detection trace includes a first detection section and a second detection section that are insulated from each other. The first detection section is used to receive a fixed signal, and the second detection section is used to be electrically connected to the touch chip.

4. The touch panel according to claim 3, characterized in that, The orthographic projections of the first detection unit and the second detection unit on the substrate are respectively at least partially overlapped with the orthographic projections of different first touch traces on the substrate.

5. The touch panel according to claim 1, characterized in that, The number of first touch electrodes is multiple, and the orthographic projection of the first touch trace electrically connected to at least one end of any first touch electrode on the substrate and the orthographic projection of the detection trace on the substrate are at least partially overlapped.

6. The touch panel according to claim 5, characterized in that, The orthographic projection of the first touch trace electrically connected to both ends of the first touch electrode on the substrate is at least partially overlapping the orthographic projection of the detection trace on the substrate.

7. The touch panel according to claim 1, wherein The detection wiring is arranged around the touch area.

8. The touch panel according to claim 2, characterized in that, The detection trace includes a first detection sub-trace, a second detection sub-trace, and a bus. The first detection sub-trace and the second detection sub-trace are spaced apart and are both electrically connected to the bus. The bus is used to connect to the touch chip. Wherein, the orthographic projection of the first touch trace electrically connected to the first end of the first touch electrode on the substrate and the orthographic projection of the first detection sub-trace on the substrate are at least partially overlapping, and the orthographic projection of the first touch trace electrically connected to the second end of the first touch electrode on the substrate and the orthographic projection of the second detection sub-trace on the substrate are at least partially overlapping.

9. The touch panel according to claim 8, characterized in that, The first detection sub-trace is arranged around the touch area, and the second detection sub-trace and the bus are arranged on the same side of the touch area.

10. The touch panel according to claim 8, characterized in that, The number of first touch electrodes is multiple, the first touch electrodes extend along a first direction, the multiple first touch electrodes are arranged at intervals in a second direction, and the number of first detection sub-routes and second detection sub-routes are both multiple, the multiple first touch electrodes include a first target touch electrode and a second target touch electrode; Wherein, the orthographic projection of the first touch trace electrically connected to the first end of the first target touch electrode and the second target touch electrode on the substrate overlaps with the orthographic projection of the same first detection sub-trace on the substrate, and / or, the orthographic projection of the first touch trace electrically connected to the second end of the first target touch electrode and the second target touch electrode on the substrate overlaps with the orthographic projection of the same second detection sub-trace on the substrate.

11. The touch panel according to claim 10, characterized in that, The plurality of first touch traces include a first target touch trace electrically connected to the first target touch electrode and a second target touch trace electrically connected to the second target touch electrode. The first target touch trace and the second target touch trace are symmetrically arranged about the middle of the plurality of first touch traces in the second direction.

12. The touch panel according to claim 10, characterized in that, Multiple first detection sub-routes are arranged in a concentric ring around the periphery of the touch area, and multiple second detection sub-routes are spaced apart on one side of the touch area; Wherein, the orthographic projection of the first touch trace electrically connected to the first end of the two adjacent first touch electrodes on the substrate overlaps with the orthographic projection of the two adjacent first detection sub-traces on the substrate; And / or, the orthographic projections of the first touch traces electrically connected to the second ends of two adjacent first touch electrodes on the substrate overlap with the orthographic projections of the two adjacent second detection sub-traces on the substrate.

13. The touch panel according to claim 1, characterized in that, The touch panel includes: The second touch electrode intersects with and is insulated from the first touch electrode.

14. The touch panel according to claim 13, characterized in that, The touch panel includes: A first touch layer is disposed on one side of the substrate, and the first touch trace is formed in the first touch layer; A second touch layer is disposed on one side of the substrate and is insulated from the first touch layer, and the detection trace is formed in the second touch layer; Wherein, the first touch electrode is formed in the first touch layer, and the second touch electrode is formed in the second touch layer; or, the first touch electrode includes a plurality of electrically connected first touch electrode blocks spaced apart along a first direction, and the second touch electrode includes a plurality of electrically connected second touch electrode blocks spaced apart along a second direction, wherein the first direction and the second direction intersect, and both the first touch electrode blocks and the second touch electrode blocks are formed in the first touch layer, and adjacent first touch electrode blocks / second touch electrode blocks are electrically connected via a bridging member formed in the second touch layer.

15. A display device, characterized in that, Including the touch panel as described in any one of claims 1 to 14.

16. A detection method for a touch panel, characterized in that, The touch panel includes a touch area and a border area disposed on at least one side of the touch area. The touch panel includes: a substrate; a first touch electrode disposed on one side of the substrate and located in the touch area; a first touch trace disposed on one side of the substrate and located in the border area, wherein the number of first touch traces is plurality of, and at least one first touch trace is electrically connected to each end of the first touch electrode, and the first touch trace electrically connected to both ends of the first touch electrode is used for electrical connection with a touch chip; and a detection trace disposed on one side of the substrate and located in the border area, wherein the detection trace and the first touch trace are disposed on different layers, and the at least one first touch trace electrically connected to the first touch electrode and the detection trace have at least partially overlapping projections on the substrate. The detection method includes: The touch chip charges the first touch electrode through the first touch trace; The touch chip determines whether the first touch trace, which is electrically connected to the first touch electrode, is open-circuited based on the signal output by the detection trace, wherein the detection trace is electrically connected to the touch chip. Alternatively, the touch chip determines whether the first touch trace, which is electrically connected to the first touch electrode, is open-circuited based on the signal returned by the first touch trace, wherein the detection trace is used to connect a fixed signal. Specifically, the touch chip determines whether the first touch trace has an open circuit based on the capacitance value of the coupling capacitor between the detection trace and the first touch electrode.

17. The detection method according to claim 16, characterized in that, The orthographic projections of the first touch traces electrically connected to the two ends of the first touch electrode on the substrate at least partially overlap with the orthographic projections of the detection traces on the substrate; and the step of the touch chip determining whether the first touch trace electrically connected to the first touch electrode has an open circuit based on the signal output by the detection trace includes: The touch chip determines the capacitance value between the detection trace and the first touch trace based on the signal output by the detection trace; In response to the capacitance value being within a first preset range, it is determined that none of the first touch traces electrically connected to the two ends of the first touch electrode have experienced a break in circuit. In response to the capacitance value being within a second preset range, it is determined that the first touch trace electrically connected to the first end of the first touch electrode has an open circuit. In response to the capacitance value being within a third preset range, it is determined that the first touch trace electrically connected to the second end of the first touch electrode has experienced an open circuit.

Images