Touch display panel and touch display device

Abstract

The invention provides a touch display panel and a touch display device, belongs to the technical field of display, and can solve the problem that an existing touch display panel is poor in electromagnetic touch performance. The touch display panel comprises a substrate, a display structure layer, a capacitance touch structure layer and an electromagnetic touch structure layer, the display structure layer is located on the substrate; the capacitance touch structure layer is located on one side, deviating from the substrate, of the display structure layer; the electromagnetic touch structure layer is located on the side, away from the display structure layer, of the substrate.

Description

Technical Field

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

[0002] With the development of touch display technology, stylus technology has been applied to the interaction between users and touch display panels. The current mainstream stylus technology solutions are mainly divided into capacitive stylus technology and electromagnetic stylus technology. Among them, electromagnetic stylus technology has relatively better touch performance and is widely used in professional fields (such as digital tablets, etc.).

[0003] The current electromagnetic stylus technology can attach the electromagnetic touch structure layer to the capacitive touch structure layer in an external form, but it is easy to increase the thickness of the touch display panel and increase the cost. Alternatively, the capacitive touch structure layer can be shared or partially shared in an embedded form, but the resistance of the electromagnetic touch structure layer is large and cannot meet the electromagnetic touch requirements. It is also easy to interfere with the touch performance of the capacitive touch structure layer. Summary of the invention

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

[0005] In a first aspect, an embodiment of the present disclosure provides a touch display panel, the touch display panel comprising: a base substrate, a display structure layer, a capacitive touch structure layer and an electromagnetic touch structure layer;

[0006] The display structure layer is located on the base substrate;

[0007] The capacitive touch structure layer is located on a side of the display structure layer away from the base substrate;

[0008] The electromagnetic touch structure layer is located on a side of the base substrate away from the display structure layer.

[0009] In some embodiments, the electromagnetic touch structure layer includes: a first electromagnetic touch layer, a first insulating layer, a second electromagnetic touch layer, and a second insulating layer which are sequentially stacked in a direction away from the base substrate;

[0010] The first electromagnetic touch layer includes: a plurality of first electromagnetic coils extending along a first direction; the second electromagnetic touch layer includes: a plurality of second electromagnetic coils extending along a second direction; the first direction and the second direction are arranged crosswise; the touch display panel also includes: a plurality of first electromagnetic touch pads and a plurality of second electromagnetic touch pads located on a side of the base substrate away from the first electromagnetic touch layer;

[0011] The first electromagnetic coil is connected to the first electromagnetic touch pad through a first via hole penetrating the base substrate;

[0012] The second electromagnetic coil is connected to the second electromagnetic touch pad through a second via hole that penetrates the first insulating layer, the first electromagnetic touch layer and the base substrate.

[0013] In some embodiments, the capacitive touch structure layer includes: a plurality of first capacitive touch electrodes arranged along a first direction and a plurality of second capacitive touch electrodes arranged along a second direction; the touch display panel further includes: a plurality of first capacitive touch pads and a plurality of second capacitive touch pads located on a side of the base substrate away from the first electromagnetic touch layer;

[0014] The first capacitive touch electrode is connected to the first capacitive touch pad through a third via hole penetrating the display structure layer;

[0015] The second capacitive touch electrode is connected to the second capacitive touch pad through a fourth via hole penetrating the display structure layer.

[0016] In some embodiments, the first electromagnetic touch pads and the second electromagnetic touch pads are arranged alternately; the first capacitive touch pads and the second capacitive touch pads are arranged alternately.

[0017] In some embodiments, the display structure layer includes: an array substrate; the array substrate includes: a plurality of display pads;

[0018] The first electromagnetic touch pad and the second electromagnetic touch pad are arranged on one side of the display pad; the first capacitive touch pad and the second capacitive touch pad are arranged on the other side of the display pad.

[0019] In some embodiments, at least part of the first capacitive touch pads are reused as the first electromagnetic touch pads; at least part of the second capacitive touch pads are reused as the second electromagnetic touch pads;

[0020] The touch display panel further includes: a plurality of first multiplexers and a plurality of second multiplexers located on a side of the base substrate away from the first electromagnetic touch layer;

[0021] The input end of the first multiplexer is connected to one of the first capacitive touch electrodes and one of the first electromagnetic touch coils, the output end is connected to one of the first capacitive touch pads, and the control end is connected to the selection signal end;

[0022] The input end of the second multiplexer is connected to one of the second capacitive touch electrodes and one of the second electromagnetic touch coils, the output end is connected to one of the second capacitive touch pads, and the control end is connected to the selection signal end.

[0023] In some embodiments, the touch display panel further includes: an integrated touch driving chip and a level converter located on a side of the second insulating layer away from the base substrate;

[0024] The integrated touch driving chip is connected to the plurality of the first capacitive touch pads and the second capacitive touch pads;

[0025] The input end of the level converter is connected to the integrated touch control driving chip, and the output end is connected to the selection signal end.

[0026] In some embodiments, the electromagnetic touch structure layer includes: a first electromagnetic touch layer, a first insulating layer, a second electromagnetic touch layer, and a second insulating layer which are sequentially stacked in a direction away from the base substrate;

[0027] The first electromagnetic touch layer includes: a plurality of first electromagnetic coils extending along a first direction; the second electromagnetic touch layer includes: a plurality of second electromagnetic coils extending along a second direction; the first direction and the second direction are arranged crosswise; the touch display panel also includes: a plurality of first electromagnetic touch pads and a plurality of second electromagnetic touch pads located on a side of the second insulating layer away from the base substrate;

[0028] The first electromagnetic coil is connected to the first electromagnetic touch pad through a fifth via hole penetrating the first insulating layer, the second electromagnetic touch layer and the second insulating layer;

[0029] The second electromagnetic coil is connected to the second electromagnetic pad through a sixth via hole penetrating the second insulating layer.

[0030] In some embodiments, the display structure layer includes: an array substrate; the array substrate includes: a plurality of display pads;

[0031] The orthographic projection of the display pad on the base substrate falls on one end of the base substrate, and the orthographic projections of the first electromagnetic touch pad and the second electromagnetic touch pad on the base substrate fall on the other end of the base substrate.

[0032] In some embodiments, the touch display panel further includes: an electromagnetic touch flexible circuit board, an electromagnetic touch driving chip and a main control board;

[0033] The electromagnetic touch flexible circuit board is connected to the first electromagnetic touch pad and the second electromagnetic touch pad, and is bent to a side of the second insulating layer away from the base substrate;

[0034] The electromagnetic touch control driving chip is located on a side of the electromagnetic touch control flexible circuit board away from the base substrate, and is connected to the main control board through the electromagnetic touch control flexible circuit board.

[0035] In some embodiments, the touch display panel further includes: an electromagnetic touch flexible circuit board, an electromagnetic touch driving chip, a main control board and a display touch driving board;

[0036] The electromagnetic touch flexible circuit board is connected to the first electromagnetic touch pad and the second electromagnetic touch pad, and is bent to the side of the second insulating layer away from the base substrate, and is connected to the display touch driving board;

[0037] The display touch driving board is located on the side of the second insulating layer away from the base substrate and is connected to the main control board;

[0038] The electromagnetic touch control driving chip is located at a side of the display touch control driving board away from the base substrate, and is connected to the display touch control driving board.

[0039] In a second aspect, an embodiment of the present disclosure provides a touch display device, which includes the touch display panel provided above. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the structure of an exemplary touch display panel.

[0041] Figure 2 FIG. 4 is a schematic diagram of the structure of another exemplary touch display panel.

[0042] Figure 3 A schematic diagram of the structure of a touch display panel provided in an embodiment of the present disclosure.

[0043] Figure 4 for Figure 3 A schematic structural diagram of the first electromagnetic touch layer in the touch display panel is shown.

[0044] Figure 5 for Figure 3 A schematic structural diagram of a second electromagnetic touch layer in a touch display panel is shown.

[0045] Figure 6 for Figure 3 A schematic structural diagram of a capacitive touch structure layer in a touch display panel is shown.

[0046] Figure 7 A schematic diagram of the arrangement of various pads in a touch display panel provided in an embodiment of the present disclosure.

[0047] Figure 8 Another schematic diagram of the arrangement of the pads in the touch display panel provided in the embodiment of the present disclosure is shown.

[0048] Figure 9a A timing diagram of a touch signal.

[0049] Figure 9b is a timing diagram of another touch signal.

[0050] Fig.10 A schematic diagram of the structure of another touch display panel provided in an embodiment of the present disclosure.

[0051] Fig.11 for Fig.10 The schematic diagram of the connection structure between the touch display panel and the driving chip is shown.

[0052] Fig.12 for Fig.11 A structural schematic diagram of the back side of the touch display panel shown.

[0053] Fig.13 for Fig.11 Another structural schematic diagram of the back side of the touch display panel is shown. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical scheme and advantages of the embodiments of the present disclosure clearer, the technical scheme in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all of the embodiments. The components of the embodiments of the present disclosure generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the present disclosure for protection, but merely represents the selected embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present disclosure.

[0055] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantitative restrictions, but indicate that there is at least one. "Including" or "comprising" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0056] The "multiple or several" mentioned in this disclosure refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0057] Figure 1 is a schematic diagram of an exemplary structure of a touch display panel, such as Figure 1 As shown, the touch display panel includes: a base substrate 101, a display structure layer 102 and a capacitive touch structure layer 103. The display structure layer 102 is located on the base substrate 101, and the capacitive touch structure layer 103 is located on the side of the display structure layer 102 away from the base substrate 101.

[0058] The base substrate 101 can support the display structure layer 102 and the capacitive touch structure layer 103 thereon. The display structure layer 102 can emit light under the drive of the display drive signal, and can be a liquid crystal display panel or an organic light emitting diode display panel. The capacitive touch structure layer 103 can monitor the change of the capacitance signal in the case of finger touch to determine the position where the finger touch occurs, thereby realizing the finger touch function.

[0059] In order to realize the touch function of the electromagnetic touch pen, the electromagnetic touch structure layer 104 may be attached to the side of the capacitive touch structure layer 103 away from the base substrate 101 to form an add-on mode touch display panel.

[0060] Figure 1 The external touch display panel shown has a certain thickness because the electromagnetic touch structure layer 104 is attached independently, which easily leads to thicker touch display panel and increased cost. In order to reduce the thickness of touch display panel, embedded touch display panel (In Cell Touch Panel) came into being.

[0061] Figure 2 is a schematic diagram of the structure of another exemplary touch display panel, such as Figure 2 As shown, the touch display panel is an embedded touch display panel, wherein the electromagnetic touch structure layer 104 is located on the side of the capacitive touch display structure 103 close to the base substrate 101, and the electromagnetic touch structure layer 104 shares or partially shares the capacitive touch structure layer 103. It can be understood that other film layers such as a buffer layer, a polarizer, and a protective layer are also provided in the touch display panel, and the settings in the related art can be referred to, and no further details are given here.

[0062] Since the touch area of ​​the finger is large, the touch accuracy of the capacitive touch structure layer 103 is low, and the touch area of ​​the electromagnetic touch pen is small, the touch accuracy of the electromagnetic touch structure layer 104 is high. The resistance of the wiring of the capacitive touch structure layer 103 is large and cannot meet the touch requirements of the electromagnetic touch structure layer 104. At the same time, the distance between the capacitive touch structure layer 103 and the electromagnetic touch structure layer 104 is relatively close, and the two are easy to interfere with each other, affecting the electromagnetic touch performance of the touch display panel.

[0063] In order to solve at least one of the above technical problems, the embodiments of the present disclosure provide a touch display panel and a touch display device. The touch display panel and the touch display device provided by the embodiments of the present disclosure will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0064] In a first aspect, an embodiment of the present disclosure provides a touch display panel, Figure 3 A schematic diagram of the structure of a touch display panel provided in an embodiment of the present disclosure is shown in FIG. Figure 3 As shown, the touch display panel includes: a base substrate 101, a display structure layer 102, a capacitive touch structure layer 103 and an electromagnetic touch structure layer 104; the display structure layer 102 is located on the base substrate 101; the capacitive touch structure layer 103 is located on the side of the display structure layer 102 away from the base substrate 101; the electromagnetic touch structure layer 104 is located on the side of the base substrate 101 away from the display structure 102 layer.

[0065] The base substrate 101 can be made of a rigid material such as glass, which can improve the bearing capacity of the base substrate 101 for other film layers thereon. Of course, the base substrate 101 can also be made of a flexible material such as polyimide (PI), which can improve the overall bending and stretching resistance of the touch display panel, and avoid the stress generated during bending, stretching, and twisting that causes the base substrate 101 to break and cause a short circuit. In practical applications, the material of the base substrate 101 can be reasonably selected according to actual needs to ensure that the touch display panel has good performance.

[0066] The display structure layer 102 may specifically include: an array substrate 1021 and a light emitting device layer 1022, etc. The array substrate 1021 is provided with a pixel driving circuit, and the pixel driving circuit may be a 4T2C (i.e., 4 transistors and 2 capacitors) structure, a 3T1C (i.e., 3 transistors and 1 capacitor) structure, a 7T1C (i.e., 7 transistors and 1 capacitor) structure, a 5T1C (i.e., 5 transistors and 1 capacitor) structure, an 8T1C (i.e., 8 transistors and 1 capacitor) structure, or an 8T2C (i.e., 8 transistors and 2 capacitors) structure, etc. The light emitting device layer 1022 is provided with a light emitting device, which may be a light emitting diode (Light Emitting Diode, LED), an organic light emitting diode (Organic Light Emitting Diode, OLED), a quantum dot light emitting diode (Quantum Dot Light Emitting Diode, QLED), a mini light emitting diode (Mini Light Emitting Diode, MiniLED), a micro light emitting diode (Micro Light Emitting Diode, Micro LED), etc., which are not limited here. A packaging layer or other structure may also be attached to the light emitting device layer 1022 to prevent the intrusion of gases such as water and oxygen from damaging the light emitting devices therein.

[0067] The capacitive touch structure layer 103 is located on the side of the display structure layer 102 away from the base substrate 101. Specifically, it can be a mutual capacitance touch structure or a self-capacitive touch structure. When a finger touches, the change of the capacitance signal can be monitored to determine the position where the finger touches, thereby realizing the finger touch function.

[0068] The electromagnetic touch structure layer 104 is located on the side of the base substrate 101 away from the display structure layer 102. It can be specifically composed of electromagnetic coils extending in different directions. The electromagnetic coils in different extending directions can form an array antenna. When the electromagnetic stylus is touched, electromagnetic induction can occur between the electromagnetic touch structure layer 104 and the electromagnetic stylus. By monitoring the change in magnetic flux, the position where the electromagnetic stylus touches can be determined, thereby realizing electromagnetic stylus touch.

[0069] In the touch display panel provided by the embodiment of the present disclosure, the capacitive touch structure layer 103 is located on the side of the display structure layer 102 away from the base substrate 101, and the electromagnetic touch structure layer 104 is located on the side of the base substrate 101 away from the display structure layer 102, which can form an embedded touch display panel, reduce the overall thickness of the touch display panel, and is conducive to the thinness of the touch display panel and reduce the process cost. At the same time, the electromagnetic touch structure layer 104 in the touch display panel is independently set, and it is not necessary to share or partially share the capacitive touch structure layer 103. In terms of process, the wiring in the electromagnetic touch structure layer 104 can be made of high-conductivity metal materials, and the width and thickness of the wiring are almost unrestricted, which can reduce the resistance of the wiring in the electromagnetic touch structure layer 104, thereby improving the electromagnetic touch performance of the touch display panel. The capacitive touch structure layer 103 and the electromagnetic touch structure layer 104 are respectively located on both sides of the base substrate 101, which can avoid mutual interference between the capacitive touch signal of the capacitive touch structure layer 103 and the electromagnetic touch signal of the electromagnetic touch structure layer 104, thereby further improving the electromagnetic touch performance of the touch display panel.

[0070] Figure 4 for Figure 3 The schematic diagram of the structure of the first electromagnetic touch layer in the touch display panel shown in FIG. Figure 5 for Figure 3 The structural diagram of the second electromagnetic touch layer in the touch display panel is shown in FIG. Figure 3 , Figure 4 and Figure 5 As shown, the electromagnetic touch structure layer 104 includes: a first electromagnetic touch layer 1041, a first insulating layer 1042, a second electromagnetic touch layer 1043 and a second insulating layer 1043 which are stacked in sequence in a direction away from the base substrate 101; the first electromagnetic touch layer 1041 includes: a plurality of first electromagnetic coils 1041a extending in a first direction; the second electromagnetic touch layer 1043 includes: a plurality of second electromagnetic coils 1043a extending in a second direction; the first direction and the second direction are arranged crosswise; the touch display panel also includes: a plurality of first electromagnetic touch pads 105 and a plurality of second electromagnetic touch pads 106 located on the base substrate 101 away from the first electromagnetic touch layer 1041; the first electromagnetic coil 1041a is connected to the first electromagnetic touch pad 105 through a first via hole penetrating the base substrate 101; the second electromagnetic coil 1043a is connected to the second electromagnetic touch pad 106 through a second via hole penetrating the first insulating layer 1042, the first electromagnetic touch layer 1041 and the base substrate 101.

[0071] like Figure 4 As shown, the first electromagnetic touch layer 1041 may be composed of a plurality of first electromagnetic coils 1041a extending along a first direction, the first direction may be an X direction, and each first electromagnetic coil 1041a may be composed of a plurality of turns of metal wiring. For ease of understanding, Figure 4 Only one circle of metal wiring is shown in the figure. The first electromagnetic coil 1041a can be made of one of the metal materials such as Cu, Ag, Al, Ti, Mo, Au, or an alloy of multiple materials among the above metal materials. The first electromagnetic coil 1041a has two ends, one end is an excitation end, and the other end is a ground end. The excitation end can be connected to an electromagnetic touch drive signal, and the ground end can be connected to a ground signal to form a current loop and generate a magnetic field.

[0072] like Figure 5 As shown, the second electromagnetic touch layer 1043 may be composed of a plurality of second electromagnetic coils 1043a extending along a second direction, the second direction may be a Y direction, and each second electromagnetic coil 1043a may be composed of a plurality of turns of metal wiring. For ease of understanding, Figure 5 Only one circle of metal wiring is shown in the figure. The second electromagnetic coil 1043a can be made of one of the metal materials such as Cu, Ag, Al, Ti, Mo, Au, or an alloy of multiple materials among the above metal materials. The second electromagnetic coil 1043a has two ends, one end is an excitation end, and the other end is a ground end. The excitation end can be connected to an electromagnetic touch drive signal, and the ground end can be connected to a ground signal to form a current loop and generate a magnetic field.

[0073] The first insulating layer 1042 can be made of at least one of silicon nitride (SiN) and silicon oxide (SiO2), and can form a single-layer structure made of a single material, or a multi-layer structure made of multiple different materials. The first insulating layer 1042 is disposed between the first electromagnetic touch layer 1041 and the second electromagnetic touch layer 1043, and can prevent a short circuit between the first electromagnetic coil 1041a and the second electromagnetic coil 1043a, thereby affecting the electromagnetic touch function.

[0074] The second insulating layer 1044 can be made of the same material as the first insulating layer 1042 . The second insulating layer 1044 covers the second electromagnetic touch layer 1043 , which can prevent a short circuit between the second electromagnetic coil 1043 a and other conductive film layers thereon, thereby preventing the electromagnetic touch effect from being affected.

[0075] The first electromagnetic touch pad 105 can be disposed on the side of the base substrate 101 away from the first electromagnetic touch layer 1041, and can be connected to an external drive circuit structure to provide an electromagnetic touch drive signal. The first electromagnetic coil 1041a (excitation end) is connected to the first electromagnetic touch pad 105 through a first via hole penetrating the base substrate 101 to provide an electromagnetic touch drive signal to the first electromagnetic coil 1041a.

[0076] The second electromagnetic touch pad 106 is configured in the same manner as the first electromagnetic touch pad 105 , and the second electromagnetic coil 1043 a (excitation end) can be connected to the second electromagnetic touch pad 106 through a second via hole penetrating the first insulating layer 1042 , the first electromagnetic touch layer 1043 and the base substrate 101 to provide an electromagnetic touch driving signal to the second electromagnetic coil 1043 a .

[0077] It should be noted here that Figure 3 Only the first via hole and the corresponding first electromagnetic touch pad 105 are shown. Due to the limitation of the cross-sectional structure schematic diagram, only a portion of the second via hole is shown, and the second electromagnetic touch pad 106 is not shown. The structure of the second electromagnetic touch pad 106 is the same as that of the first electromagnetic touch pad 105.

[0078] Figure 6 for Figure 3 The structural diagram of the capacitive touch structure layer in the touch display panel shown in FIG. Figure 3 and Figure 6 As shown, the capacitive touch structure layer 103 includes: a plurality of first capacitive touch electrodes 1031 arranged along a first direction and a plurality of second capacitive touch electrodes 1032 arranged along a second direction; the touch display panel also includes: a plurality of first capacitive touch pads 107 (which will be described in the following description, and can be referred to in detail) located on the side of the base substrate 101 away from the first electromagnetic touch layer 1041. Figure 7 ) and a plurality of second capacitive touch pads 108 (which will be described in the following description, and can be referred to Figure 7 ); the first capacitive touch electrode 1031 is connected to the first capacitive touch pad 107 through a third via hole penetrating the display structure layer 102; the second capacitive touch electrode 1032 is connected to the second capacitive touch pad 108 through a fourth via hole penetrating the display structure layer 102.

[0079] like Figure 6 As shown, the capacitive touch structure layer 103 can be composed of a plurality of first capacitive touch electrodes 1031 arranged along a first direction and a plurality of second capacitive touch electrodes 1032 arranged along a second direction. The first direction can be an X direction, and the second direction can be a Y direction. The first capacitive touch electrodes 1031 can be drive electrodes that can transmit capacitive touch drive signals, and the second capacitive touch electrodes 1032 can be sensing electrodes that can transmit capacitive touch sensing signals. A capacitive signal can be formed between the two. In the case of finger touch, the change of the capacitive signal can be monitored to determine the position where the finger touch occurs, thereby realizing the finger touch function.

[0080] The first capacitive touch pad 107 can be disposed on the side of the base substrate 101 away from the first electromagnetic touch layer 1041, and can be connected to an external driving circuit structure to provide a capacitive touch driving signal. The first capacitive touch electrode 1031 is connected to the first capacitive touch pad 107 through a third via hole penetrating the display structure layer 102 to provide a capacitive touch driving signal to the first capacitive touch electrode 1031.

[0081] The second capacitive touch pad 108 is configured similarly to the first capacitive touch pad 107 . The second capacitive touch electrode 1032 can be connected to the second capacitive touch pad 108 through a fourth via hole penetrating the display structure layer 102 to provide a capacitive touch sensing signal to the second capacitive touch electrode 1032 .

[0082] Figure 7 A schematic diagram of the arrangement of the pads in the touch display panel provided in the embodiment of the present disclosure is shown in FIG. Figure 7 As shown, the first electromagnetic touch pads 105 and the second electromagnetic touch pads 106 are arranged alternately; the first capacitive touch pads 107 and the second capacitive touch pads 108 are arranged alternately.

[0083] The first electromagnetic touch pad 105 and the second electromagnetic touch pad 106 are arranged in an interlaced manner, and the two can be connected to an external electromagnetic touch drive circuit to transmit electromagnetic touch signals respectively. The first capacitive touch pad 107 and the second capacitive touch pad 108 are arranged in an interlaced manner, and the two can be connected to an external capacitive touch drive circuit to transmit capacitive touch drive signals and capacitive touch sensing signals respectively. Each electromagnetic touch pad (the first electromagnetic touch pad 105 and the second electromagnetic touch pad 106) and the capacitive touch pad (the first capacitive touch pad 107 and the second capacitive touch pad 108) are independently arranged, and a separate driving method can be adopted, that is, the electromagnetic touch drive circuit is used for electromagnetic touch drive, and the capacitive touch drive circuit is used for capacitive touch drive.

[0084] In some embodiments, Figure 3 As shown, the display structure layer 102 includes: an array substrate 1021; Figure 7 As shown, the array substrate 1021 includes: a plurality of display pads 109 ; a first electromagnetic touch pad 105 and a second electromagnetic touch pad 106 arranged on one side of the display pad 109 ; a first capacitive touch pad 107 and a second capacitive touch pad 108 arranged on the other side of the display pad 109 .

[0085] The display pad 109 can transmit data signals to provide data signals for the pixel driving circuit in the array substrate 1021, so that the light-emitting devices in the light-emitting device layer 1022 emit light. The electromagnetic touch pads (the first electromagnetic touch pad 105 and the second electromagnetic touch pad 106) and the capacitive touch pads (the first capacitive touch pad 107 and the second capacitive touch pad 108) are arranged on both sides of the display pad 109, respectively. During the preparation process, the above pads can be made of easy processes and the same materials, which can reduce the difficulty of the process and save the preparation cost. In addition, the distance between the electromagnetic touch pad and the capacitive touch pad can be increased to avoid mutual interference between the electromagnetic touch signal and the capacitive touch signal, thereby improving the electromagnetic touch performance of the touch display panel.

[0086] Figure 8 Another schematic diagram of the arrangement of the pads in the touch display panel provided by the embodiment of the present disclosure is shown in FIG. Figure 8 As shown, at least part of the first capacitive touch pad 107 is multiplexed as the first electromagnetic touch pad 105; at least part of the second capacitive touch pad 108 is multiplexed as the second electromagnetic touch pad 106; the touch display panel also includes: a plurality of first multiplexers MUX1 and a plurality of second multiplexers MUX2 located on the side of the base substrate 101 away from the first electromagnetic touch layer 1041; the input end of the first multiplexer MUX1 is connected to a first capacitive touch electrode 1031 and a first electromagnetic touch coil 1041a, the output end is connected to a first capacitive touch pad 107, and the control end is connected to the selection signal end select; the input end of the second multiplexer MUX is connected to a second capacitive touch electrode 1032 and a second electromagnetic touch coil 1043a, the output end is connected to a second capacitive touch pad 108, and the control end is connected to the selection signal end select. The integrated touch driving chip IC is connected to the plurality of first capacitive touch pads 107 and second capacitive touch pads 108 ; the input end of the level converter Level shift is connected to the integrated touch driving chip IC, and the output end is connected to the selection signal end Select.

[0087] The driver chip IC is connected to the level converter Level shift through at least one general-purpose input / output (GPIO) port. The level converter Level shift converts the normal voltage signal output by the driver chip IC into a high voltage signal for controlling the opening and closing of the first multiplexer MUX1 and the second multiplexer MUX2. The level converter Level shift is connected to the first multiplexer MUX1 and the second multiplexer MUX2 through at least one selection switch (Select) port, and controls multiple first multiplexers MUX1 and second multiplexers MUX2 through a selection signal.

[0088] Figure 9a is a timing diagram of a touch signal, such as Figure 9a As shown, when the selection signal is a high-level signal, the first multiplexer MUX1 and the second multiplexer MUX2 conduct the first electromagnetic coil 1041a with the first electromagnetic pad 105, and the second electromagnetic coil 1043a with the second electromagnetic pad 106, so as to realize the electromagnetic touch (electromagnetic stylus touch) function. When the selection signal is a low-level signal, the first multiplexer MUX1 and the second multiplexer MUX2 conduct the first capacitive touch electrode 1031 with the first capacitive pad 107, and the second capacitive touch electrode 1032 with the second capacitive touch pad 108, so as to realize the capacitive touch (finger touch) function.

[0089] Figure 9b 2 is another timing diagram of a touch signal. During the time of one frame of display, the selection signal is continuously a low-level signal, and the first multiplexer MUX1 and the second multiplexer MUX2 conduct the first capacitive touch electrode 1031 to the first capacitive pad 107, and the second capacitive touch electrode 1032 to the second capacitive touch pad 108, thereby realizing the capacitive touch function. At this time, the touch display panel only supports the capacitive touch (finger touch) function.

[0090] In the touch display panel provided by the embodiment of the present disclosure, at least part of the first capacitive touch pad 107 is multiplexed as the first electromagnetic touch pad 105, and at least part of the second capacitive touch pad 108 is multiplexed as the second electromagnetic touch pad 106, and the electromagnetic touch signal and the capacitive touch signal are respectively provided through the first multiplexer MUX1 and the second multiplexer MUX2. In this way, while meeting the functions of capacitive touch and electromagnetic touch, the number of touch pads can be reduced, so the area of ​​the touch pad at the edge of the touch display panel can be reduced, which is beneficial to the narrow frame design of the touch display panel and improves the touch display effect.

[0091] Fig.10A structural diagram of another touch display panel provided in an embodiment of the present disclosure is shown in FIG. Fig.10 As shown, the electromagnetic touch structure layer 104 includes: a first electromagnetic touch layer 1041, a first insulating layer 1042, a second electromagnetic touch layer 1043 and a second insulating layer 1044 which are stacked in sequence in a direction away from the base substrate 101. The specific structures of the first electromagnetic touch layer 1041 and the second electromagnetic touch layer 1042 can refer to the above Figure 5 and Figure 6 The first electromagnetic touch layer 1041 includes: a plurality of first electromagnetic coils 1041a extending along the first direction; the second electromagnetic touch layer 1043 includes: a plurality of second electromagnetic coils 1043a extending along the second direction; the first direction and the second direction are arranged crosswise; the touch display panel also includes: a plurality of first electromagnetic touch pads 105 and a plurality of second electromagnetic touch pads 106 located on the side of the second insulating layer 1044 away from the base substrate 101; the first electromagnetic coil 1041a is connected to the first electromagnetic touch pad 105 through a fifth via hole penetrating the first insulating layer 1042, the second electromagnetic touch layer 1043 and the second insulating layer 1044; the second electromagnetic coil 1043a is connected to the second electromagnetic pad 106 through a sixth via hole penetrating the second insulating layer 1044.

[0092] Fig.10 The touch display panel shown is Figure 3 The touch display panel shown is different in that Figure 3 The first electromagnetic touch pad 105 and the second electromagnetic touch pad 106 in the touch display panel are located on the base substrate 101, that is, arranged in the array substrate 1021. Fig.10 The first electromagnetic touch pad 105 and the second electromagnetic touch pad 106 in the touch display panel are located on a side of the second insulating layer 1044 away from the base substrate 101 . Fig.10 During the preparation of the touch display panel shown, the fifth via hole and the sixth via hole can be formed by etching the second insulating layer 1044 only, without etching the base substrate 101, which can avoid damage to the base substrate 101, reduce process difficulty, and improve production yield.

[0093] Fig.11 for Fig.10 The schematic diagram of the connection structure between the touch display panel and the driver chip is shown in FIG. Fig.11 As shown, the display structure layer 102 includes: an array substrate 1021; the array substrate 1021 includes: a plurality of display pads 109; the orthographic projection of the display pad 109 on the base substrate 101 falls on one end of the base substrate 101, and the orthographic projection of the first electromagnetic touch pad 105 and the second electromagnetic touch pad 106 on the base substrate 101 falls on the other end of the base substrate 101.

[0094] The orthographic projection of the display pad 109 on the base substrate 101 falls on one end of the base substrate 101, and the orthographic projection of the first electromagnetic touch pad 105 and the second electromagnetic touch pad 106 on the base substrate 101 falls on the other end of the base substrate 101, which can avoid mutual interference between the first electromagnetic touch pad 105 and the second electromagnetic touch pad 106 and the display pad 109, thereby providing electromagnetic touch performance of the touch display panel.

[0095] Fig.12 for Fig.11 A structural schematic diagram of the back of the touch display panel shown in FIG. Fig.12 As shown, the touch display panel also includes: an electromagnetic touch flexible circuit board FPC1, an electromagnetic touch driving chip IC1 and a main control board Main board; the electromagnetic touch flexible circuit board FPC1 is connected to the first electromagnetic touch pad 105 and the second electromagnetic touch pad 106, and is bent to the side of the second insulating layer 1044 away from the base substrate 101; the electromagnetic touch driving chip IC1 is located on the side of the electromagnetic touch flexible circuit board FPC1 away from the base substrate 101, and is connected to the main control board Main board through the electromagnetic touch flexible circuit board FPC1.

[0096] The electromagnetic touch flexible circuit board FPC1 is connected to the first electromagnetic touch pad 105 and the second electromagnetic touch pad 106 by connecting conductive glue to be electrically conductive. The electromagnetic touch driving chip IC1 is directly set on the electromagnetic touch flexible circuit board FPC1, and can be directly connected to the main control board Main board through the electromagnetic touch flexible circuit board FPC1.

[0097] Fig.13 for Fig.11 Another structural schematic diagram of the back side of the touch display panel shown in FIG. Fig.13 As shown, the touch display panel also includes: an electromagnetic touch flexible circuit board FPC1, an electromagnetic touch driving chip IC1, a main control board Main board and a display touch driving board; the electromagnetic touch flexible circuit board FPC1 is connected to the first electromagnetic touch pad 105 and the second electromagnetic touch pad 106, and is bent to the side of the second insulating layer 1044 away from the base substrate 101, and is connected to the display touch driving board; the display touch driving board is located on the side of the second insulating layer 1044 away from the base substrate 101, and is connected to the main control board Main board; the electromagnetic touch driving chip IC1 is located on the side of the display touch driving board away from the base substrate 101, and is connected to the display touch driving board.

[0098] The electromagnetic touch control driving chip IC1 can be arranged on the display touch control driving board, and the electromagnetic touch control flexible circuit board FPC1 is connected to the display touch control driving board, and then communicates with the main control board Main board.

[0099] In a second aspect, an embodiment of the present disclosure provides a touch display device, which includes a touch display panel as provided in any of the above embodiments. The display device can be, for example, a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a vehicle-mounted device, or any other product with a display touch function. Other essential components of the display device should be understood by those skilled in the art, and will not be described in detail here, nor should they be used as a limitation to the present disclosure.

[0100] It should be noted that in the accompanying drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. It is also understood that when an element or layer is referred to as being "on" another element or layer, it may be directly on the other element, or there may be an intermediate layer. In addition, it is understood that when an element or layer is referred to as being "under" another element or layer, it may be directly under the other element, or there may be more than one intermediate layer or element. In addition, it is also understood that when a layer or element is referred to as being "between" two layers or two elements, it may be the only layer between the two layers or two elements, or there may also be more than one intermediate layer or element. Similar reference numerals throughout the text indicate similar elements.

[0101] In the several embodiments provided in the present disclosure, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the position of the components shown is only a logical functional position, and there may be other position arrangements in actual implementation.

[0102] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A touch display panel, characterized in that: The touch display panel comprises: a base substrate, a display structure layer, a capacitive touch structure layer and an electromagnetic touch structure layer; The display structure layer is located on the base substrate; The capacitive touch structure layer is located on a side of the display structure layer away from the base substrate; The electromagnetic touch structure layer is located on a side of the base substrate away from the display structure layer.

2. The touch display panel according to claim 1, characterized in that: The electromagnetic touch structure layer comprises: a first electromagnetic touch layer, a first insulating layer, a second electromagnetic touch layer and a second insulating layer which are sequentially stacked in a direction away from the base substrate; The first electromagnetic touch layer includes: a plurality of first electromagnetic coils extending along a first direction; the second electromagnetic touch layer includes: a plurality of second electromagnetic coils extending along a second direction; the first direction and the second direction are arranged crosswise; the touch display panel also includes: a plurality of first electromagnetic touch pads and a plurality of second electromagnetic touch pads located on a side of the base substrate away from the first electromagnetic touch layer; The first electromagnetic coil is connected to the first electromagnetic touch pad through a first via hole penetrating the base substrate; The second electromagnetic coil is connected to the second electromagnetic touch pad through a second via hole that penetrates the first insulating layer, the first electromagnetic touch layer and the base substrate.

3. The touch display panel according to claim 2, characterized in that: The capacitive touch structure layer includes: a plurality of first capacitive touch electrodes arranged along a first direction and a plurality of second capacitive touch electrodes arranged along a second direction; the touch display panel also includes: a plurality of first capacitive touch pads and a plurality of second capacitive touch pads located on a side of the base substrate away from the first electromagnetic touch layer; The first capacitive touch electrode is connected to the first capacitive touch pad through a third via hole penetrating the display structure layer; The second capacitive touch electrode is connected to the second capacitive touch pad through a fourth via hole penetrating the display structure layer.

4. The touch display panel according to claim 3, characterized in that: The first electromagnetic touch pads and the second electromagnetic touch pads are arranged alternately; the first capacitive touch pads and the second capacitive touch pads are arranged alternately.

5. The touch display panel according to claim 4, characterized in that: The display structure layer comprises: an array substrate; the array substrate comprises: a plurality of display pads; The first electromagnetic touch pad and the second electromagnetic touch pad are arranged on one side of the display pad; the first capacitive touch pad and the second capacitive touch pad are arranged on the other side of the display pad.

6. The touch display panel according to claim 3, characterized in that: At least part of the first capacitive touch pads is reused as the first electromagnetic touch pads; at least part of the second capacitive touch pads is reused as the second electromagnetic touch pads; The touch display panel further includes: a plurality of first multiplexers and a plurality of second multiplexers located on a side of the base substrate away from the first electromagnetic touch layer; The input end of the first multiplexer is connected to one of the first capacitive touch electrodes and one of the first electromagnetic touch coils, the output end is connected to one of the first capacitive touch pads, and the control end is connected to the selection signal end; The input end of the second multiplexer is connected to one of the second capacitive touch electrodes and one of the second electromagnetic touch coils, the output end is connected to one of the second capacitive touch pads, and the control end is connected to the selection signal end.

7. The touch display panel according to claim 6, characterized in that: The touch display panel further includes: an integrated touch driving chip and a level converter located on a side of the second insulating layer away from the base substrate; The integrated touch driving chip is connected to the plurality of the first capacitive touch pads and the second capacitive touch pads; The input end of the level converter is connected to the integrated touch control driving chip, and the output end is connected to the selection signal end.

8. The touch display panel according to claim 1, characterized in that: The electromagnetic touch structure layer comprises: a first electromagnetic touch layer, a first insulating layer, a second electromagnetic touch layer and a second insulating layer which are sequentially stacked in a direction away from the base substrate; The first electromagnetic touch layer includes: a plurality of first electromagnetic coils extending along a first direction; the second electromagnetic touch layer includes: a plurality of second electromagnetic coils extending along a second direction; the first direction and the second direction are arranged crosswise; the touch display panel also includes: a plurality of first electromagnetic touch pads and a plurality of second electromagnetic touch pads located on a side of the second insulating layer away from the base substrate; The first electromagnetic coil is connected to the first electromagnetic touch pad through a fifth via hole penetrating the first insulating layer, the second electromagnetic touch layer and the second insulating layer; The second electromagnetic coil is connected to the second electromagnetic pad through a sixth via hole penetrating the second insulating layer.

9. The touch display panel according to claim 8, characterized in that: The display structure layer comprises: an array substrate; the array substrate comprises: a plurality of display pads; The orthographic projection of the display pad on the base substrate falls on one end of the base substrate, and the orthographic projections of the first electromagnetic touch pad and the second electromagnetic touch pad on the base substrate fall on the other end of the base substrate.

10. The touch display panel according to claim 9, characterized in that: The touch display panel also includes: an electromagnetic touch flexible circuit board, an electromagnetic touch driving chip and a main control board; The electromagnetic touch flexible circuit board is connected to the first electromagnetic touch pad and the second electromagnetic touch pad, and is bent to a side of the second insulating layer away from the base substrate; The electromagnetic touch control driving chip is located on a side of the electromagnetic touch control flexible circuit board away from the base substrate, and is connected to the main control board through the electromagnetic touch control flexible circuit board.

11. The touch display panel according to claim 9, characterized in that: The touch display panel also includes: an electromagnetic touch flexible circuit board, an electromagnetic touch driving chip, a main control board and a display touch driving board; The electromagnetic touch flexible circuit board is connected to the first electromagnetic touch pad and the second electromagnetic touch pad, and is bent to the side of the second insulating layer away from the base substrate, and is connected to the display touch driving board; The display touch driving board is located on the side of the second insulating layer away from the base substrate and is connected to the main control board; The electromagnetic touch control driving chip is located at a side of the display touch control driving board away from the base substrate, and is connected to the display touch control driving board.

12. A touch display device, characterized in that: The touch display device comprises the touch display panel according to any one of claims 1 to 11.

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