Touch control circuit, touch chip, touch module and display device

Abstract

The application relates to a touch control circuit, a touch chip, a touch module and a display device. The touch control circuit comprises a driving circuit, a sensing circuit, a shielding circuit and a switching switch circuit. The driving circuit is used for outputting a touch sensing driving signal to a first touch sensing layer of a touch panel. The sensing circuit is used for receiving a touch sensing signal of a second touch sensing layer of the touch panel. The shielding circuit is used for outputting a shielding signal. A plurality of first ends of the switching switch circuit are connected with the driving circuit, the sensing circuit and each shielding circuit respectively. A plurality of second ends of the switching switch circuit are connected with the first touch sensing layer and the second touch sensing layer respectively. The above touch control circuit can improve the electromagnetic compatibility of the touch panel in necessary scenarios.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a touch control circuit, a touch chip, a touch module, and a display device. Background Technology

[0002] Currently, with the increasingly widespread application of various electronic devices, other nearby devices are prone to electromagnetic interference. The most effective way to reduce electromagnetic interference or improve the electromagnetic pollution resistance of electronic devices is to adopt electromagnetic compatibility (EMC) design.

[0003] Electromagnetic compatibility (EMC) generally refers to the degree of electromagnetic interference caused by unintentionally generated, propagated, and received electromagnetic waves to the outside world, or the degree of electromagnetic interference caused by external electromagnetic waves to electronic products. For display devices, improving EMC in necessary scenarios is of paramount importance. However, current methods for improving EMC in display devices often involve adding a shielding layer, which increases the thickness of the display panel and hinders the pursuit of thinner and lighter display devices. Summary of the Invention

[0004] Therefore, it is necessary to provide a touch control circuit, touch chip, touch module, and display device that can improve the electromagnetic compatibility of touch panels in necessary scenarios, addressing the aforementioned technical problems.

[0005] In a first aspect, this application provides a touch control circuit, the touch control circuit comprising:

[0006] The driving circuit is used to output touch sensing driving signals to the first touch sensing layer of the touch panel;

[0007] The sensing circuit is used to receive touch sensing signals from the second touch sensing layer of the touch panel;

[0008] At least one shielding circuit is used to output a shielding signal;

[0009] A switching circuit is provided, wherein multiple first terminals of the switching circuit are respectively connected to the driving circuit, the sensing circuit, and each of the shielding circuits, and multiple second terminals of the switching circuit are respectively connected to the first touch sensing layer and the second touch sensing layer.

[0010] In one embodiment, the touch control circuit includes a first shielding circuit and a second shielding circuit, wherein when the switching circuit is in the first switching state, the sensing circuit is electrically connected to the first touch sensing layer, the driving circuit is electrically connected to the second touch sensing layer, and the touch control circuit is used for touch detection.

[0011] When the switching circuit is in the second switch state, the first shielding circuit is connected to the first touch sensing layer, and the second shielding circuit is connected to the second touch sensing layer, so that the first touch sensing layer and the second touch sensing layer are used to shield electromagnetic interference.

[0012] In one embodiment, the touch control circuit further includes:

[0013] The self-capacitive sensing circuit is connected to the first terminal of the switching circuit and is used to output the touch sensing drive signal and receive the touch sensing signal.

[0014] In one embodiment, the touch control circuit further includes a third shielding circuit. When the switching circuit is in the third switch state, the self-capacitance sensing circuit is connected to the first touch sensing layer, and the third shielding circuit is connected to the second touch sensing layer. The touch control circuit is used to perform touch detection and to shield the first touch sensing layer and the second touch sensing layer from electromagnetic interference.

[0015] In one embodiment, the shielding circuit is connected to a common ground terminal.

[0016] Secondly, this application provides a touch chip, including: a touch control circuit as described in any of the preceding claims.

[0017] Thirdly, this application provides a touch module, comprising: a touch chip and a touch panel as described above; the touch panel includes a first touch sensing layer, an optical adhesive layer and a second touch sensing layer stacked sequentially, the first touch sensing layer and the second touch sensing layer being respectively connected to a plurality of second terminals of the switching circuit, and the first touch sensing layer and the second touch sensing layer being used to generate the touch sensing signal when the touch panel is touched.

[0018] In one embodiment, the first touch sensing layer includes a first electrode pattern layer, the second touch sensing layer includes a second electrode pattern layer, and the first electrode pattern layer and the second electrode pattern layer are respectively connected to a plurality of second terminals of the switching circuit via metal lines.

[0019] In one embodiment, the first electrode pattern layer and the second electrode pattern layer are respectively an indium tin oxide layer and a metal mesh layer.

[0020] Fourthly, this application provides a display device including the touch module described above.

[0021] The aforementioned touch control circuit, touch chip, touch module, and display device, by connecting multiple first terminals of the switching circuit to the driving circuit, sensing circuit, and shielding circuit respectively, and connecting multiple second terminals of the switching circuit to the first and second touch sensing layers of the touch panel respectively, can control the switching state of the switching circuit and the circuits connected to the first and second touch sensing layers. When electromagnetic compatibility needs to be improved, the shielding circuit can be connected to the first and second touch sensing layers respectively, so that the shielding signal is output to the first and second touch sensing layers, which basically covers the entire touch panel. This can shield external radiation interference, improve the radiation tolerance of the machine itself, and shield the radiation interference generated by the machine itself to avoid affecting external electronic devices. The above shielding method uses the first and second touch sensing layers as shielding layers, eliminating the need for additional shielding layers, thus avoiding increasing the thickness of the display panel and contributing to the thinner and lighter display device. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology 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.

[0023] Figure 1 This is a schematic diagram showing the connection relationship between the touch control circuit and the touch panel in one embodiment of this application;

[0024] Figure 2 This is a partial cross-sectional schematic diagram of an existing display panel;

[0025] Figure 3 This is a schematic diagram showing the connection relationship between the existing touch control circuit and the touch panel.

[0026] Figure 4 This is a schematic diagram showing the connection relationship between the touch control circuit and the touch panel when the switching circuit is in the first switching state in one embodiment of this application.

[0027] Figure 5 This is a schematic diagram showing the connection relationship between the touch control circuit and the touch panel when the switching circuit is in the second switching state in one embodiment of this application.

[0028] Figure 6 This is a schematic diagram showing the connection relationship between the touch control circuit and the touch panel in another embodiment of this application;

[0029] Figure 7This is a schematic diagram showing the connection relationship between the touch control circuit and the touch panel when the switching circuit is in the third switching state in one embodiment of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 101-Glass cover plate, 102-First optical adhesive layer, 103-First touch sensing layer, 104-Second optical adhesive layer, 105-Second touch sensing layer, 106-Third optical adhesive layer, 107-Liquid crystal display module, 108-Flexible circuit board, 109-Touch control circuit, 1091-Sensing circuit, 1092-Driver circuit, 110-Electronic ink layer, 301-Touch control circuit, 3011-Sensing circuit, 3012-Shielding circuit, 3013-Driver circuit, 3014-Switch circuit, 3015-First shielding circuit, 3016-Second shielding circuit, 3017-Self-capacitive sensing circuit, 3018-Third shielding circuit, 302-First touch sensing layer, 303-Second touch sensing layer. Detailed Implementation

[0032] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0033] 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 belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0034] When one element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element present. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0035] In the accompanying drawings, the dimensions of layers and regions may be exaggerated for clarity. It is understood that when a layer or element is referred to as "on" another layer or substrate, the layer or element may be directly on said other layer or substrate, or there may be intermediate layers. Furthermore, it is understood that when a layer is referred to as "between" two layers, the layer may be the only layer between said two layers, or there may be one or more intermediate layers. Additionally, the same reference numerals always denote the same elements.

[0036] In the following embodiments, when a layer, region, or element is “connected,” it can be interpreted as the layer, region, or element being connected not only directly but also through other constituent elements placed therebetween. For example, when a layer, region, element, etc., is described as being connected or electrically connected, the layer, region, element, etc., can not only be directly connected or directly electrically connected, but can also be connected or electrically connected through another layer, region, element, etc., placed therebetween.

[0037] In the following text, although terms such as “first” and “second” may be used to describe various components, these components are not necessarily limited to the terms above. The terms above are only used to distinguish one component from another. It will also be understood that expressions used in the singular form include plural expressions, unless the singular form has a distinctly different meaning in the context.

[0038] When a phrase such as "at least one of..." follows a list of elements, it modifies the entire list of elements, not individual elements within that list. It should also be understood that terms such as "comprising / including" or "having" specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0039] Electronic or electrical devices and / or any other related devices or components (e.g., display devices including a display panel and a display panel driver, wherein the display panel driver further includes a drive controller, a gate driver, a gamma reference voltage generator, a data driver, and a transmit driver) according to embodiments of the concepts described herein can be implemented using any suitable hardware, firmware (e.g., application-specific integrated circuits), software, or a combination of software, firmware, and hardware. For example, various components of these devices may be formed on an integrated circuit (IC) chip or on a separate IC chip. Additionally, various components of these devices may be implemented on a flexible printed circuit film, a tape-on-a-package (TCP), a printed circuit board (PCB), or formed on a substrate. Furthermore, various components of these devices may be processes or threads running on one or more processors in one or more computing devices to execute computer program instructions and interact with other system components to perform the various functions described herein. Computer program instructions are stored in memory, which may be implemented in a computing device using standard storage devices such as random access memory (RAM). Computer program instructions may also be stored in other non-transitory computer-readable media such as CD-ROMs, flash drives, etc. Furthermore, those skilled in the art will recognize that the functions of various computing devices may be combined or integrated into a single computing device, or the functions of a particular computing device may be distributed across one or more other computing devices, without departing from the spirit and scope of the exemplary embodiments of the present application.

[0040] While exemplary embodiments of the display module and the display device including the display module have been specifically described herein, many modifications and variations will be apparent to those skilled in the art. Therefore, it will be understood that the display module and the display device including the display module, constructed according to the principles of this application, may be implemented in ways other than those specifically described herein. This application is also defined in the claims and their equivalents.

[0041] As described in the background section, with the increasingly widespread application of various electronic devices, other nearby devices are prone to electromagnetic interference. Currently, an effective way to reduce electromagnetic interference or improve the electromagnetic pollution resistance of electronic devices is to adopt electromagnetic compatibility design.

[0042] Electromagnetic compatibility (EMC) generally refers to the degree of electromagnetic interference caused by unintentionally generated, propagated, and received electromagnetic waves to the outside world, or the degree of electromagnetic interference caused by external electromagnetic waves to electronic products. For display devices, improving EMC is of paramount importance. However, current methods for improving EMC in display devices often involve adding a shielding layer, which increases the thickness of the display panel and hinders the pursuit of thinner and lighter displays.

[0043] For the reasons mentioned above, such as Figure 1 As shown, this application provides a touch control circuit 301, which includes a driving circuit 3013, a sensing circuit 3011, a shielding circuit 3012, and a switching circuit 3014. The driving circuit 3013 is used to output a touch sensing driving signal to the first touch sensing layer 302 of the touch panel; the sensing circuit 3011 is used to receive the touch sensing signal of the second touch sensing layer 303 of the touch panel; the shielding circuit 3012 is used to output a shielding signal; a plurality of first terminals of the switching circuit 3014 are respectively connected to the driving circuit 3013, the sensing circuit 3011, and each of the shielding circuits 3012, and a plurality of second terminals of the switching circuit 3014 are respectively connected to the first touch sensing layer 302 and the second touch sensing layer 303.

[0044] In existing technologies, the cross-sectional view of a typical GFF structure (i.e., one layer of glass plus two thin films) display panel is as follows: Figure 2 As shown, the display panel includes a flexible circuit board 108 and a touch control circuit 109 disposed thereon, as well as a glass cover plate 101, an electronic ink layer 110, a first optical adhesive layer 102, a first touch sensing layer 103, a second optical adhesive layer 104, a second touch sensing layer 105, a third optical adhesive layer 106, and a liquid crystal display module 107, which are stacked sequentially. The touch panel of this embodiment is no different from existing touch panels. The first touch sensing layer 302 and the second touch sensing layer 303 of this embodiment can be found in [reference needed]. Figure 2 The first touch sensing layer 103 and the second touch sensing layer 105 shown herein can be found in the following examples. Figure 2 The touch panel shown includes a glass cover plate 101, a first optical adhesive layer 102, a first touch sensing layer 103, a second optical adhesive layer 104, and a second touch sensing layer 105 stacked sequentially. The first optical adhesive layer 102 and the second optical adhesive layer 104 can be OCA optical adhesive layers. The first touch sensing layer 103 and the second touch sensing layer 105 are generally ITO (Indium Tin Oxides) thin films or metal thin films. The first touch sensing layer 103 and the second touch sensing layer 105 include an electrode pattern layer, which is generally a strip-shaped or diamond-shaped mesh layer. The electrode pattern layer is connected to a flexible circuit board 108 via surrounding metal lines. The flexible circuit board 108 is provided with a touch control circuit 109, which typically includes a driving circuit 1092 and a sensing circuit 1091, such as... Figure 3As shown, the driving circuit 1092 is connected to the electrode pattern layer of the second touch sensing layer 105. The driving circuit 1092 provides a touch sensing driving signal to the electrode pattern layer of the second touch sensing layer 105 so that the touch panel performs touch sensing. The sensing circuit 1091 is connected to the electrode pattern layer of the first touch sensing layer 103 so that the sensing circuit 1091 receives the touch sensing signal output by the touch panel, thereby realizing the touch function.

[0045] The touch control circuit 301 in this embodiment includes a driving circuit 3013, a sensing circuit 3011, a shielding circuit 3012, and a switching circuit 3014. Multiple first terminals of the switching circuit 3014 are respectively connected to the driving circuit 3013, the sensing circuit 3011, and the shielding circuit 3012. Multiple second terminals of the switching circuit 3014 are respectively connected to the first touch sensing layer 302 and the second touch sensing layer 303 of the touch panel. It can be understood that by controlling the first and second terminals of the switching circuit 3014, the circuits connected to the first touch sensing layer 302 and the second touch sensing layer 303 can be controlled. When the touch function of the touch panel needs to be implemented, by controlling the switching state of the switching circuit, the sensing circuit 3011 is connected to the first touch sensing layer 302, and the driving circuit 3013 is connected to the second touch sensing layer 303, thereby realizing the touch function. When necessary to improve electromagnetic compatibility, the switching state of the switching circuit 3014 is switched so that the shielding circuit 3012 is connected to the first touch sensing layer 302 and the second touch sensing layer 303 respectively. The shielding signal output by the shielding circuit 3012 is transmitted to the first touch sensing layer 302 and the second touch sensing layer 303, and the first touch sensing layer 302 and the second touch sensing layer 303 are used as shielding layers. This can shield external radiation interference, improve the radiation tolerance of the machine itself, and at the same time shield the radiation interference generated by the machine itself to avoid affecting external electronic equipment.

[0046] The shielding signal can be the grounding signal of the common ground terminal or a fixed signal, such as a sine wave pulse signal.

[0047] The aforementioned touch control circuit 301 connects multiple first terminals of the switching circuit 3014 to the driving circuit 3013, the sensing circuit 3011, and the shielding circuit 3012, respectively, and connects multiple second terminals of the switching circuit 3014 to the first touch sensing layer 302 and the second touch sensing layer 303 of the touch panel, respectively. This allows control of the switching state of the switching circuit 3014 and the circuits connected to the first touch sensing layer 302 and the second touch sensing layer 303. When electromagnetic compatibility needs to be improved, the shielding circuit 3012 can be connected to the first touch sensing layer 302 and the second touch sensing layer 303, respectively, so that the shielding signal is output to the first touch sensing layer 302 and the second touch sensing layer 303, which basically covers the entire touch panel. This can shield external radiation interference, improve the radiation tolerance of the machine itself, and shield the radiation interference generated by the machine itself to avoid affecting external electronic equipment. The aforementioned shielding method uses the first touch sensing layer 302 and the second touch sensing layer 303 as shielding layers, eliminating the need for additional shielding layers. This avoids increasing the thickness of the display panel and facilitates the thinning of the display device.

[0048] In one embodiment, such as Figure 4 and Figure 5 As shown, the touch control circuit 301 includes a first shielding circuit 3015 and a second shielding circuit 3016. When the switching circuit 3014 is in a first switching state, the sensing circuit 3011 is electrically connected to the first touch sensing layer 302, and the driving circuit 3013 is electrically connected to the second touch sensing layer 303. The touch control circuit 301 is used for touch detection. When the switching circuit 3014 is in a second switching state, the first shielding circuit 3015 is electrically connected to the first touch sensing layer 302, and the second shielding circuit 3016 is electrically connected to the second touch sensing layer 303, so that the first touch sensing layer 302 and the second touch sensing layer 303 are used to shield against electromagnetic interference.

[0049] Based on the foregoing, it can be understood that when the switching circuit 3014 is in the first switching state, the driving circuit 3013 provides a touch-sensing driving signal to the second touch-sensing layer 303, enabling the touch panel to perform touch sensing. The sensing circuit 3011 is connected to the first touch-sensing layer 302, allowing the sensing circuit 3011 to receive the touch-sensing signal output by the touch panel, thereby realizing the touch function. When the switching circuit 3014 is in the second switching state, the shielding signals output by the first shielding circuit 3015 and the second shielding circuit 3016 are transmitted to the first touch-sensing layer 302 and the second touch-sensing layer 303 respectively, thus using the first touch-sensing layer 302 and the second touch-sensing layer 303 as shielding layers. This shields against external radiation interference, improves the radiation tolerance of the machine itself, and also blocks radiation interference generated by the machine itself. Therefore, the operating mode of the corresponding display device can be controlled by switching the switching state of the switching circuit 3014, switching between touch mode and anti-electromagnetic interference mode.

[0050] In applications, the first shielding circuit 3015 and the second shielding circuit 3016 can be the same circuit.

[0051] In one embodiment, such as Figure 6 As shown, the touch control circuit 301 further includes a self-capacitance sensing circuit 3017, which is connected to the first terminal of the switching circuit 3014 and is used to output the touch sensing drive signal and receive the touch sensing signal.

[0052] In applications, capacitive touch technology employs two techniques: mutual capacitance sensing and self-capacitance sensing. In mutual capacitance sensing, a driving signal (touch sensing signal / touch sensing drive signal) is provided by the driving circuit 3013, and the sensing circuit 3011 receives the change in capacitance (i.e., the touch sensing signal in the above embodiment). Self-capacitance sensing, in contrast, involves the circuit providing a driving signal while simultaneously sensing and receiving changes in capacitance. In this embodiment, when the self-capacitance sensing circuit 3017 is connected to the first touch sensing layer 302 or the second touch sensing layer 303, the self-capacitance sensing circuit 3017 outputs the touch sensing drive signal to the first touch sensing layer 302 or the second touch sensing layer 303, and receives the touch sensing signal transmitted by the first touch sensing layer 302 or the second touch sensing layer 303, thereby achieving self-capacitance sensing and ultimately enabling touch functionality.

[0053] It is understandable that by controlling the switching state of the switch, the corresponding display device can be controlled to use mutual capacitance sensing technology or self-capacitance sensing technology to achieve the touch function.

[0054] In one embodiment, such as Figure 7 As shown, the touch control circuit 301 further includes a third shielding circuit 3018. When the switching circuit 3014 is in the third switch state, the self-capacitance sensing circuit 3017 is connected to the first touch sensing layer 302, and the third shielding circuit 3018 is connected to the second touch sensing layer 303. The touch control circuit 301 is used to perform touch detection and to shield the first touch sensing layer 302 and the second touch sensing layer 303 from electromagnetic interference.

[0055] In applications, the first shielding circuit 3015, the second shielding circuit 3016, and the third shielding circuit 3018 can be the same circuit.

[0056] In this embodiment, it can be understood that when the switching circuit 3014 is in the third switch state, the self-capacitive sensing circuit 3017 is connected to the first touch sensing layer 302. At this time, the touch technology is switched from mutual capacitance technology to self-capacitive technology. Meanwhile, the third shielding circuit 3018 is connected to the second touch sensing layer 303. The shielding signal output by the third shielding circuit 3018 is transmitted to the first touch sensing layer 302, using the first touch sensing layer 302 as a shielding layer. At this time, the touch panel can shield radiation interference while still having touch functionality.

[0057] In one embodiment, the shielding circuit 3012 is connected to a common ground terminal.

[0058] In this embodiment, by connecting the shielding circuit 3012 to the common ground terminal, the shielding circuit 3012 only needs to output the signal of the common ground terminal as the shielding signal, without the shielding circuit 3012 generating a shielding signal, which helps to simplify the shielding circuit 3012.

[0059] In one embodiment, this application also provides a touch chip, including: a touch control circuit 301 as described in any of the preceding claims.

[0060] The touch chip is mounted on a flexible circuit board. The driving circuit 3013, the sensing circuit 3011, the shielding circuit 3012, and the switching circuit 3014 are all integrated into the touch chip, thereby improving the integration of the display device and allowing the touch chip to control the switching state of the switching circuit 3014.

[0061] The aforementioned touch chip includes a touch control circuit 301. Since multiple first terminals of the switching circuit 3014 are respectively connected to the driving circuit 3013, the sensing circuit 3011, and the shielding circuit 3012, and multiple second terminals of the switching circuit 3014 are respectively connected to the first touch sensing layer 302 and the second touch sensing layer 303 of the touch panel, the touch chip can control the switching state of the switching circuit 3014 and control the circuits connected to the first touch sensing layer 302 and the second touch sensing layer 303. When it is necessary to improve electromagnetic compatibility, the shielding circuit 3012 can be connected to the first touch sensing layer 302 and the second touch sensing layer 303 respectively, so that the shielding signal is output to the first touch sensing layer 302 and the second touch sensing layer 303, which basically covers the entire touch panel. This can shield external radiation interference, improve the radiation tolerance of the machine itself, and at the same time shield the radiation interference generated by the machine itself to avoid affecting external electronic equipment. The aforementioned shielding method uses the first touch sensing layer 302 and the second touch sensing layer 303 as shielding layers, eliminating the need for additional shielding layers. This avoids increasing the thickness of the display panel and facilitates the thinning of the display device.

[0062] In one embodiment, this application also provides a touch module, including: a touch chip and a touch panel as described above; the touch panel includes a first touch sensing layer 302, an optical adhesive layer and a second touch sensing layer 303 stacked sequentially, the first touch sensing layer 302 and the second touch sensing layer 303 are respectively connected to a plurality of second terminals of the switching circuit 3014, and the first touch sensing layer 302 and the second touch sensing layer 303 are used to generate the touch sensing signal when the touch panel is touched.

[0063] The touch panel in this embodiment is no different from the touch panels of the prior art; for details, please refer to [link / reference]. Figure 2The touch panel shown includes a glass cover, a first optical adhesive layer, a first touch sensing layer 302, a second optical adhesive layer, and a second touch sensing layer 303 stacked sequentially. The first and second optical adhesive layers can be OCA optical adhesive layers. The first and second touch sensing layers 302 and 303 are generally ITO (Indium Tin Oxides) thin films or metal thin films. The first and second touch sensing layers 302 and 303 include electrode pattern layers, which are generally strip-shaped or diamond-shaped mesh layers. The electrode pattern layer is connected to the FPC (Flexible Printed Circuit) via surrounding metal lines. The FPC is equipped with a touch chip, which includes a touch control circuit 301. The touch control circuit 301 includes a driving circuit 3013, a sensing circuit 3011, a shielding circuit 3012, and a switching circuit 3014. The touch chip can control the switching state of the switching circuit 3014, thereby controlling the circuits connected to the first touch sensing layer 302 and the second touch sensing layer 303, thus controlling the working mode of the touch module.

[0064] The aforementioned touch module includes a touch chip and a touch panel. The touch chip includes a touch control circuit 301. Since multiple first terminals of the switching circuit 3014 of the touch control circuit 301 are respectively connected to the driving circuit 3013, the sensing circuit 3011, and the shielding circuit 3012, and multiple second terminals of the switching circuit 3014 are respectively connected to the first touch sensing layer 302 and the second touch sensing layer 303 of the touch panel, the touch chip can control the switching state of the switching circuit 3014 and control the circuits connected to the first touch sensing layer 302 and the second touch sensing layer 303. When it is necessary to improve electromagnetic compatibility, the shielding circuit 3012 can be connected to the first touch sensing layer 302 and the second touch sensing layer 303 respectively, so that the shielding signal is output to the first touch sensing layer 302 and the second touch sensing layer 303, which basically covers the entire touch panel. This can shield external radiation interference, improve the radiation tolerance of the machine itself, and at the same time shield the radiation interference generated by the machine itself to avoid affecting external electronic equipment. The aforementioned shielding method uses the first touch sensing layer 302 and the second touch sensing layer 303 as shielding layers, eliminating the need for additional shielding layers. This avoids increasing the thickness of the display panel and facilitates the thinning of the display device.

[0065] In one embodiment, the first touch sensing layer 302 includes a first electrode pattern layer, the second touch sensing layer 303 includes a second electrode pattern layer, and the first electrode pattern layer and the second electrode pattern layer are respectively connected to a plurality of second terminals of the switching circuit 3014.

[0066] Specifically, when the switching circuit 3014 is in the first switching state, the driving circuit 3013 is electrically connected to the second electrode pattern layer, and the sensing circuit 3011 is electrically connected to the first electrode pattern layer, allowing the touch module to perform touch detection. When the switching circuit 3014 is in the second switching state, the shielding signals output by the first shielding circuit 3015 and the second shielding circuit 3016 are transmitted to the first electrode pattern layer and the second electrode pattern layer, respectively. This uses the first and second electrode pattern layers as shielding layers, thereby shielding external radiation interference, improving the machine's radiation tolerance, and also shielding the radiation interference generated by the machine itself.

[0067] In one embodiment, the first electrode pattern layer and the second electrode pattern layer are respectively an indium tin oxide layer and a metal mesh layer.

[0068] In one embodiment, based on the same inventive concept, this application also provides a display device (not shown), which includes the touch module in the above embodiments.

[0069] It is understood that the display device in the embodiments of this application can be any product or component with display function, such as OLED display device, QLED display device, electronic paper, mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, navigator, wearable device, Internet of Things device, etc., and the embodiments disclosed in this application do not limit this.

[0070] The aforementioned display device includes the touch module described in the above embodiments. The display device can control the switching state of the switching circuit 3014 to control the circuits connected to the first touch sensing layer 302 and the second touch sensing layer 303. When improved electromagnetic compatibility is required, the shielding circuit 3012 can be connected to the first touch sensing layer 302 and the second touch sensing layer 303 respectively, thereby outputting a shielding signal to the first touch sensing layer 302 and the second touch sensing layer 303, essentially covering the entire touch panel. This effectively shields against external radiation interference, improving the machine's own radiation tolerance, and also shields against radiation interference generated by the machine itself, preventing it from affecting external electronic devices. Furthermore, the shielding method uses the first touch sensing layer 302 and the second touch sensing layer 303 as shielding layers, eliminating the need for additional shielding layers and thus avoiding increasing the thickness of the display panel, which is beneficial for making the display device thinner and lighter.

[0071] In the description of this specification, references to terms such as "some embodiments," "other embodiments," and "ideal embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A touch control circuit, characterized by, The touch control circuit includes: The driving circuit is used to output touch sensing driving signals to the first touch sensing layer of the touch panel; The sensing circuit is used to receive touch sensing signals from the second touch sensing layer of the touch panel; At least one shielding circuit is used to output a shielding signal; A switching circuit is provided, wherein multiple first terminals of the switching circuit are respectively connected to the driving circuit, the sensing circuit, and each of the shielding circuits, and multiple second terminals of the switching circuit are respectively connected to the first touch sensing layer and the second touch sensing layer. The touch control circuit includes a first shielding circuit and a second shielding circuit. When the switching circuit is in the first switch state, the sensing circuit is electrically connected to the first touch sensing layer, and the driving circuit is electrically connected to the second touch sensing layer. The touch control circuit is used for touch detection. When the switching circuit is in the second switch state, the first shielding circuit is connected to the first touch sensing layer, and the second shielding circuit is connected to the second touch sensing layer, so that the first touch sensing layer and the second touch sensing layer are used to shield electromagnetic interference.

2. The touch control circuit according to claim 1, characterized in that, The touch control circuit also includes: The self-capacitive sensing circuit is connected to the first terminal of the switching circuit and is used to output the touch sensing drive signal and receive the touch sensing signal.

3. The touch control circuit of claim 2, wherein, The touch control circuit further includes a third shielding circuit. When the switching circuit is in the third switch state, the self-capacitive sensing circuit is connected to the first touch sensing layer, and the third shielding circuit is connected to the second touch sensing layer. The touch control circuit is used to perform touch detection and to shield the first touch sensing layer and the second touch sensing layer from electromagnetic interference.

4. The touch control circuit of claim 1, wherein, The shielding circuit is connected to the common ground terminal.

5. A touch chip, characterized by, include: The touch control circuit as described in any one of claims 1 to 4. 6.A touch module, characterized in that, include: The touch chip and touch panel as described in claim 5; the touch panel includes a first touch sensing layer, an optical adhesive layer and a second touch sensing layer stacked sequentially, the first touch sensing layer and the second touch sensing layer being respectively connected to a plurality of second terminals of the switching circuit, the first touch sensing layer and the second touch sensing layer being used to generate the touch sensing signal when the touch panel is touched.

7. The touch module according to claim 6, characterized in that, The first touch sensing layer includes a first electrode pattern layer, and the second touch sensing layer includes a second electrode pattern layer. The first electrode pattern layer and the second electrode pattern layer are respectively connected to a plurality of second terminals of the switching circuit through metal lines.

8. The touch module as described in claim 7, characterized in that, The first electrode pattern layer and the second electrode pattern layer are respectively one of an indium tin oxide layer and a metal mesh layer.

9. A display device, characterized in that, Includes the touch module as described in any one of claims 6-8.

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