Touch screen

Abstract

This application discloses a touch screen, including a touch panel and a touch mode switching circuit. The touch panel includes a substrate and a multiplexed touch circuit layer disposed on the substrate. The multiplexed touch circuit layer includes multiple first touch sensing lines and multiple second touch sensing lines. The touch mode switching circuit generates a mode control signal of a first state or a second state. The mode control signal of the first state controls the first touch sensing lines and the second touch sensing lines to form a first connection relationship to perform capacitive touch detection. The mode control signal of the second state controls the first touch sensing lines and the second touch sensing lines to form a second connection relationship to perform electromagnetic touch detection. Thus, by multiplexing the first touch sensing lines and the second touch sensing lines, and dynamically reconstructing the electrical connection relationship of the first touch sensing lines and the second touch sensing lines according to the mode control signal of the first state or the second state, the same touch screen can support both finger touch and high-precision electromagnetic pen writing.

Description

Technical Field

[0001] This application relates to the field of touch technology, and in particular to a touch screen. Background Technology

[0002] With the development of touch technology, two main touch solutions exist in the market: capacitive touch and electromagnetic resonance (EMR). Capacitive touch solutions typically fabricate the touch electrodes directly on the color filter substrate of the display panel, directly supporting finger touch and compatible with active capacitive pens. However, the operating frequency of active capacitive pens is easily affected by display driver noise, leading to issues such as handwriting jitter and hover failure, impacting the writing experience. EMR touch technology achieves high-precision positioning by arranging an electromagnetic coil array under the panel, coupled with the LC resonant circuit inside the electromagnetic pen. It boasts excellent noise immunity and a superior writing experience, but typically cannot respond to finger touch and has limited functionality. Currently, the two solutions operate independently, making it impossible to combine their advantages on a single touchscreen, thus limiting the user experience of touch devices in diverse application scenarios.

[0003] Therefore, it is necessary to provide improved technical solutions to overcome the above-mentioned technical problems existing in the prior art. Summary of the Invention

[0004] The purpose of this application is to provide a touch screen that supports both finger touch and high-precision electromagnetic pen writing.

[0005] To achieve the above objectives: This application provides a touch screen, including a touch panel and a touch mode switching circuit; The touch panel includes a substrate and a multiplexed touch circuit layer disposed on the substrate. The multiplexed touch circuit layer includes multiple first touch sensing lines and multiple second touch sensing lines. The touch mode switching circuit is used to generate mode control signals for the first state or the second state; The mode control signal in the first state is used to control the first touch sensing line and the second touch sensing line to form a first connection relationship in order to perform capacitive touch detection; The mode control signal in the second state is used to control the first touch sensing line and the second touch sensing line to form a second connection relationship in order to perform electromagnetic touch detection.

[0006] In one embodiment, the touch screen further includes a capacitive touch unit and an electromagnetic touch unit, both of which are connected to the first touch sensing line and the second touch sensing line; When the capacitive touch unit responds to the mode control signal of the first state, it is used to output a capacitive touch drive signal to the first touch sensing line and receive the capacitive touch sensing signal fed back by the second touch sensing line. When the electromagnetic touch unit responds to the mode control signal of the second state, it outputs an electromagnetic touch excitation signal to the first touch sensing line and detects the electromagnetic touch resonance signal fed back by the second touch sensing line.

[0007] In one embodiment, the capacitive touch unit employs a single-sided driving mode or a double-sided offset driving mode for the first touch sensing line. In the single-sided driving mode, the first end of the first touch sensing line is connected to the capacitive touch unit, and the capacitive touch driving signal is input from the first end of the first touch sensing line; In the dual-sided offset driving mode, both the first end and the second end of the first touch sensing line are connected to the capacitive touch unit, and the capacitive touch driving signal is input from the first end and the second end of the first touch sensing line.

[0008] In one embodiment, the touch mode switching circuit includes a mode control unit, which includes a first signal output terminal for outputting a first enable signal and a second signal output terminal for outputting a second enable signal. When the first enable signal is valid and the second enable signal is invalid, a mode control signal is formed for the first state. When the first enable signal is invalid and the second enable signal is valid, a mode control signal is generated to form the second state.

[0009] In one embodiment, the touch mode switching circuit further includes a first switch circuit, which is connected to the first signal output terminal, the first touch sensing line, and the second touch sensing line. When the first switching circuit responds to a valid first enable signal, it controls multiple first touch sensing lines and multiple second touch sensing lines to be in parallel to form the first connection relationship. When the first switching circuit responds to an invalid first enable signal, it controls multiple first touch sensing lines and multiple second touch sensing lines to be in series to form the second connection relationship.

[0010] In one embodiment, the touch mode switching circuit further includes a second switch circuit, which is connected to the second signal output terminal, the first touch sensing line, and the second touch sensing line. When the second switching circuit responds to a valid second enable signal, it controls the connection of the first touch sensing line and the second touch sensing line to ground. When the second switching circuit responds to an invalid second enable signal, it controls the first touch sensing line and the second touch sensing line to disconnect from ground.

[0011] In one embodiment, the first switching circuit includes a plurality of first switching elements and a plurality of second switching elements; The control terminal of the first switching element is connected to the first signal output terminal, and the first path terminal and the second path terminal of the first switching element are respectively connected to two adjacent first touch sensing lines. The control terminal of the second switching element is also connected to the first signal output terminal, and the first path terminal and the second path terminal of the second switching element are respectively connected to two adjacent second touch sensing lines. When the first enable signal is valid, both the first switching element and the second switching element are in the on state; When the first enable signal is invalid, both the first switching element and the second switching element are in the off state; The first switching circuit further includes a fifth switching element. The control terminal of the fifth switching element is connected to the first signal output terminal, the first path terminal of the fifth switching element is connected to the capacitive touch unit, and the second path terminal of the fifth switching element is connected to the second end of the first touch sensing line. When the first enable signal is valid, the fifth switching element is in the on state, controlling the capacitive touch driving signal to be input from the second end of the first touch sensing line, so that the first touch sensing line is in the double-sided offset driving mode.

[0012] In one embodiment, the second switching circuit includes a third switching element and a fourth switching element; The control terminal of the third switching element is connected to the second signal output terminal, the first path terminal of the third switching element is connected to the first touch sensing line, and the second path terminal of the third switching element is connected to ground. The control terminal of the fourth switching element is also connected to the second signal output terminal, the first path terminal of the fourth switching element is connected to the second touch sensing line, and the second path terminal of the fourth switching element is connected to ground. When the second enable signal is valid, both the third and fourth switching elements are in the ON state; When the second enable signal is invalid, both the third and fourth switching elements are in the off state.

[0013] In one embodiment, the multiplexed touch circuit layer includes a first conductive layer and a second conductive layer that are mutually insulated from each other; The plurality of first touch sensing lines are arranged along a first direction on the first conductive layer; The plurality of second touch sensing lines are arranged along the second direction on the second conductive layer; The first direction intersects with the second direction.

[0014] In one embodiment, the capacitive touch unit includes multiple output terminals of capacitive touch driving signals and multiple input terminals of capacitive touch sensing signals, and the electromagnetic touch unit includes multiple output terminals of electromagnetic touch excitation signals and multiple input terminals of electromagnetic touch resonant signals. The multiple first touch sensing lines are divided into multiple first touch sensing line groups. The multiple first touch sensing lines in each first touch sensing line group are connected to the output terminal of a capacitive touch driving signal and the output terminal of an electromagnetic touch excitation signal. The multiple second touch sensing lines are divided into multiple second touch sensing line groups. The multiple second touch sensing lines in each second touch sensing line group are connected to an input terminal of the capacitive touch sensing signal and an input terminal of the electromagnetic touch resonant signal.

[0015] The touchscreen provided in this application includes a touch panel and a touch mode switching circuit. The touch panel includes a substrate and a multiplexed touch circuit layer disposed on the substrate. The multiplexed touch circuit layer includes multiple first touch sensing lines and multiple second touch sensing lines. The touch mode switching circuit generates a mode control signal for a first state or a second state. The mode control signal for the first state controls the first touch sensing lines and the second touch sensing lines to form a first connection relationship to perform capacitive touch detection. The mode control signal for the second state controls the first touch sensing lines and the second touch sensing lines to form a second connection relationship to perform electromagnetic touch detection. Thus, by multiplexing the first touch sensing lines and the second touch sensing lines, and dynamically reconstructing the electrical connection relationship of the first touch sensing lines and the second touch sensing lines according to the mode control signal for the first state or the second state, the same touchscreen can support both finger touch and high-precision electromagnetic pen writing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1This is a schematic diagram of the structure of the touch screen provided in the first embodiment of this application.

[0018] Figure 2a , 2b Figures 2 and 2c are equivalent circuit connection diagrams for capacitive touch detection provided in the first embodiment of this application.

[0019] Figure 3a , 3b 3c is a schematic diagram of the equivalent circuit connection for electromagnetic touch detection provided in the first embodiment of this application.

[0020] Figure 4 This is a schematic diagram of the structure of the touch screen provided in the second embodiment of this application.

[0021] Figure 5 This is a schematic diagram of the equivalent circuit connection of the first touch sensing line during capacitive touch detection provided in the second embodiment of this application. Detailed Implementation

[0022] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0023] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.

[0024] It should be understood that although the terms first, second, third, etc., may be used herein to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this document, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if," as used herein, can be interpreted as "when," "when," or "in response to determination." Furthermore, as used herein, the singular forms "a," "an," and "the" are intended to also include the plural forms unless the context indicates otherwise. It should be further understood that the terms "comprising," "including," indicate the presence of the stated feature, step, operation, element, component, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or" and "and / or" as used herein are to be interpreted as inclusive, or mean any one or any combination thereof. Therefore, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A, B, and C". Exceptions to this definition will only occur if the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0025] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0026] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "part," or "unit" may be used interchangeably.

[0027] This application provides a touchscreen with switchable touch modes. The touchscreen includes at least a touch panel and a touch mode switching circuit. The touch panel includes a substrate and a multiplexed touch circuit layer disposed on the substrate. The multiplexed touch circuit layer includes multiple first touch sensing lines and multiple second touch sensing lines. The touch mode switching circuit generates a mode control signal for a first state or a second state. The mode control signal for the first state controls the first and second touch sensing lines to form a first connection relationship to perform capacitive touch detection; the mode control signal for the second state controls the first and second touch sensing lines to form a second connection relationship to perform electromagnetic touch detection. By multiplexing the first and second touch sensing lines and dynamically reconstructing their electrical connection relationship according to the mode control signal for the first or second state, both capacitive and electromagnetic touch functions are integrated on the same touchscreen. This allows the device to flexibly handle different scenarios, such as finger operation and professional pen writing, greatly improving the user experience and application range of the product.

[0028] Figure 1 This is a schematic diagram of the structure of a touch screen provided in the first embodiment of this application. Figure 1 As shown, the touch screen provided in this embodiment includes a touch panel 110, a touch mode switching circuit 120, a capacitive touch unit 130, and an electromagnetic touch unit 140.

[0029] Specifically, the touch panel 110 includes a substrate and a multiplexed touch circuit layer disposed on the substrate. The multiplexed touch circuit layer includes a first conductive layer and a second conductive layer that are insulated from each other. It is understood that when the touch panel 110 is a display panel, the multiplexed circuit layer is located in the display area of ​​the display panel. When the substrate is a glass substrate of the display panel, the first conductive layer and the second conductive layer can be disposed on opposite sides of the glass substrate, or insulated from each other on the same side of the glass substrate; this embodiment does not specifically limit this. Multiple first touch sensing lines Tx1 to Txn are formed on the first conductive layer, extending along a first direction. Multiple second touch sensing lines Rx1 to Rxn are formed on the second conductive layer, extending along a second direction. The first direction intersects the second direction, thereby forming a two-dimensional sensing grid with the multiple first touch sensing lines Tx1 to Txn and the multiple second touch sensing lines Rx1 to Rxn.

[0030] The touch mode switching circuit 120 includes a mode control unit, a first switch circuit, and a second switch circuit.

[0031] The mode control unit includes a first signal output terminal and a second signal output terminal. The first signal output terminal outputs a first enable signal EN1, and the second signal output terminal outputs a second enable signal EN2. When the first enable signal EN1 is valid and the second enable signal EN2 is invalid, a first-state mode control signal is formed; when the first enable signal EN1 is invalid and the second enable signal EN2 is valid, a second-state mode control signal is formed. For example, a high level (e.g., VGH) represents valid, and a low level (e.g., VGL) represents invalid. Therefore, the first-state mode control signal is: EN1 = VGH, EN2 = VGL; the second-state mode control signal is: EN1 = VGL, EN2 = VGH.

[0032] The first switching circuit is connected to the first signal output terminal of the mode control unit, the first touch sensing lines Tx1~Txn, and the second touch sensing lines Rx1~Rxn. In response to a valid first enable signal EN1 (e.g., EN1=VGH), the first switching circuit controls multiple first touch sensing lines Tx1~Txn and multiple second touch sensing lines Rx1~Rxn to be connected in parallel, forming a first connection relationship for performing capacitive touch detection. The specific equivalent connection circuit is as follows: Figure 2c As shown. When the first switching circuit responds to an invalid first enable signal EN1 (e.g., EN1=VGL), it controls multiple first touch sensing lines Tx1~Txn and multiple second touch sensing lines Rx1~Rxn to be in series, forming a second connection relationship for performing electromagnetic touch detection. The specific equivalent connection circuit is shown below. Figure 3c As shown.

[0033] The second switching circuit is connected to the second signal output terminal of the mode control unit, the first touch sensing lines Tx1 to Txn, and the second touch sensing lines Rx1 to Rxn. In electromagnetic touch mode, the second switching circuit, in response to a valid second enable signal EN2 (e.g., EN2=VGH), controls the first touch sensing lines Tx1 to Txn and the second touch sensing lines Rx1 to Rxn to connect to ground. In capacitive touch mode, the second switching circuit, in response to an invalid second enable signal EN2 (e.g., EN2=VGL), controls the first touch sensing lines Tx1 to Txn and the second touch sensing lines Rx1 to Rxn to disconnect from ground.

[0034] In this embodiment, the first switching circuit includes multiple first switching elements S1 and multiple second switching elements S2. The control terminal of the first switching element S1 is connected to the first signal output terminal of the mode control unit, and the first and second path terminals of the first switching element S1 are respectively connected to two adjacent first touch sensing lines. When the first enable signal EN1 is valid, the first switching element S1 is in the on state; when the first enable signal EN1 is invalid, the first switching element S1 is in the off state.

[0035] Specifically, in this embodiment, the second end of the (2n-1)th first sensing line is connected to the second end of the 2nth first sensing line, and the first end of the 2nth first sensing line is connected to the first end of the (2n+1)th first sensing line. Therefore, in this embodiment, the first path terminal of the (2n-1)th first switching element S1 is connected to the first end of the (2n-1)th first sensing line, the second path terminal of the (2n-1)th first switching element S1 is connected to the first end of the 2nth first sensing line; the first path terminal of the 2nth first switching element S1 is connected to the second end of the 2nth first sensing line, and the second path terminal of the 2nth first switching element S1 is connected to the second end of the (2n+1)th first sensing line. Here, n is a positive integer. For example, a first switching element S1a is connected between the first end of the first sensing line Tx1 and the first end of the second sensing line Tx2. When EN1 = VGH, the first switching element S1a is in a conducting state, connecting the beginning ends of the first sensing line Tx1 and the second sensing line Tx2 together. A second switching element S1b is connected between the second end of the second sensing line Tx2 and the second end of the third sensing line Tx3. When EN1 = VGH, the second switching element S1b is in a conducting state, connecting the ends of the second sensing line Tx2 and the third sensing line Tx3 together. Similarly, when the first enable signal EN1 is valid, multiple first switching elements S1 connect the beginning and end ends of multiple first sensing lines in parallel, forming a configuration as shown in the diagram. Figure 2a The connection relationship is shown. When the first enable signal EN1 is invalid, multiple first switching elements S1 are disconnected, causing the beginning or end of two adjacent first sensing lines to disconnect, that is, multiple first sensing lines are connected in series to form a coil-shaped electromagnetic emission circuit, such as... Figure 3a The connection relationships are shown.

[0036] In this embodiment, the control terminal of the second switching element S2 is also connected to the first signal output terminal of the mode control unit, and the first path terminal and the second path terminal of the second switching element S2 are respectively connected to two adjacent second touch sensing lines. When the first enable signal EN1 is valid, the second switching element S2 is in the on state; when the first enable signal EN1 is invalid, the second switching element S2 is in the off state.

[0037] Specifically, in this embodiment, the first end of the (2n-1)th second sensing line is connected to the first end of the 2nth second sensing line, and the second end of the 2nth second sensing line is connected to the second end of the (2n+1)th second sensing line. Therefore, in this embodiment, the first pass end of the (2n-1)th second switching element S2 is connected to the second end of the (2n-1)th second sensing line, and the second pass end of the (2n-1)th second switching element S2 is connected to the second end of the 2nth second sensing line; the first pass end of the 2nth second switching element S2 is connected to the first end of the 2nth second sensing line, and the second pass end of the 2nth second switching element S2 is connected to the first end of the (2n+1)th second sensing line. For example, the first second switching element S2a is connected between the second end of the first second sensing line Rx1 and the second end of the second second sensing line Rx2. When EN1=VGH, the first second switching element S2a is in a conducting state, connecting the ends of the first second sensing line Rx1 and the second second sensing line Rx2 together. The second second switching element S2b is connected between the first end of the second second sensing line Rx2 and the first end of the third second sensing line Rx3. When EN1 = VGH, the second second switching element S2b is in the conducting state, connecting the beginning ends of the second second sensing line Rx2 and the third second sensing line Rx3 together. Similarly, when the first enable signal EN1 is valid, multiple second switching elements S2 connect the beginning and end ends of multiple second sensing lines in parallel, forming a configuration as shown in the diagram. Figure 2b The connection relationship is shown. When the first enable signal EN1 is invalid, multiple second switching elements S2 are disconnected, causing the beginning or end of two adjacent second sensing lines to disconnect. That is, multiple second sensing lines are connected in series to form a coil-shaped electromagnetic receiving circuit, forming a circuit like... Figure 3b The connection relationships are shown.

[0038] In this embodiment, the second switching circuit includes a third switching element S3 and a fourth switching element S4. The control terminal of the third switching element S3 is connected to the second signal output terminal of the mode control unit, the first path terminal of the third switching element S3 is connected to the first touch sensing line, and the second path terminal of the third switching element S3 is connected to ground. When the second enable signal EN2 is valid, the third switching element S3 is in a conducting state, connecting the electromagnetic transmitting coil formed by multiple first sensing lines connected in series to ground; when the second enable signal EN2 is invalid, the third switching element S3 is in a cut-off state. The control terminal of the fourth switching element S4 is also connected to the second signal output terminal of the mode control unit, the first path terminal of the fourth switching element S4 is connected to the second touch sensing line, and the second path terminal of the fourth switching element S4 is connected to ground. When the second enable signal EN2 is valid, the fourth switching element S4 is in a conducting state, connecting the electromagnetic receiving coil formed by multiple second sensing lines connected in series to ground; when the second enable signal EN2 is invalid, the fourth switching element S4 is in a cut-off state.

[0039] Both the capacitive touch unit 130 and the electromagnetic touch unit 140 are connected to the mode control unit, the first touch sensing line, and the second touch sensing line. When the capacitive touch unit 130 responds to the mode control signal in the first state, it outputs capacitive touch drive signals to multiple first touch sensing lines Tx1 to Txn and receives capacitive touch sensing signals fed back from multiple second touch sensing lines Rx1 to Rxn. In this state, the multiple first touch sensing lines Tx1 to Txn serve as driving electrodes for capacitive touch, and the multiple second touch sensing lines Rx1 to Rxn serve as sensing electrodes for capacitive touch. By detecting the change in mutual capacitance at the intersection of the first and second touch sensing lines, touch positioning of a finger or stylus is achieved. When the electromagnetic touch unit 140 responds to the mode control signal in the second state, it outputs electromagnetic touch excitation signals to multiple first touch sensing lines Tx1 to Txn and detects electromagnetic touch resonance signals fed back from multiple second touch sensing lines Rx1 to Rxn. In this state, multiple series-connected first touch sensing lines Tx1 to Txn act as electromagnetic transmitting coils. The electromagnetic touch unit 140 applies a high-frequency excitation signal to the electromagnetic transmitting coils, exciting the LC circuit within the nearby electromagnetic pen to resonate. Multiple series-connected second touch sensing lines Rx1 to Rxn act as electromagnetic receiving coils, used to receive the secondary magnetic field signal generated by the electromagnetic pen's resonance. By analyzing the intensity distribution of the induced signal on the second touch sensing lines Rx1 to Rxn when the first touch sensing lines Tx1 to Txn are excited, the two-dimensional coordinates of the electromagnetic pen touch can be calculated.

[0040] It is understood that the mode control unit, capacitive touch unit 130, and electromagnetic touch unit 140 can be disposed on the substrate, or on an external circuit board or flexible circuit board. The external circuit board or flexible circuit board can be disposed around the perimeter of the substrate. The first switch circuit and the second switch circuit in the touch mode switching circuit 120 can be disposed on the substrate, or built into the mode control unit, or disposed on an external circuit board or flexible circuit board. This application does not specifically limit this.

[0041] In this embodiment, the capacitive touch unit 130 adopts a single-sided driving mode for multiple first touch sensing lines Tx1 to Txn, that is, the first ends of multiple first touch sensing lines Tx1 to Txn are connected in parallel and used as the input end of the capacitive touch driving signal, which is connected to the capacitive touch unit 130.

[0042] It is understandable that for larger touch panels, the physical lengths of the first touch sensing lines Tx1~Txn and the second touch sensing lines Rx1~Rxn increase significantly, leading to increased parasitic resistance and capacitance of a single long trace. This may cause problems such as drive signal attenuation, weakened sensing signal, and uneven response speed, thereby affecting the consistency of full-screen touch performance. Therefore, in one embodiment of this application, the capacitive touch unit 130 includes multiple output terminals of capacitive touch drive signals and multiple input terminals of capacitive touch sensing signals. The electromagnetic touch unit 140 includes multiple output terminals of electromagnetic touch excitation signals and multiple input terminals of electromagnetic touch resonant signals. The multiple first touch sensing lines are divided into multiple first touch sensing line groups TX1~TXN. The multiple first touch sensing lines in each first touch sensing line group are connected to the output terminal of a capacitive touch drive signal and the output terminal of an electromagnetic touch excitation signal. Multiple second touch sensing lines are divided into multiple second touch sensing line groups RX1 to RXN. The multiple second touch sensing lines in each second touch sensing line group are connected to the input terminal of a capacitive touch sensing signal and the input terminal of an electromagnetic touch resonant signal.

[0043] By physically dividing the multiple first touch sensing lines Tx1 to Txn in the panel into two or more groups, with each group sharing an output terminal of a capacitive touch driving signal or an electromagnetic touch excitation signal, and also physically dividing the multiple second touch sensing lines Rx1 to Rxn in the panel into two or more groups, with each group sharing an output terminal of a capacitive touch sensing signal or an electromagnetic touch resonant signal, it is possible not only to reduce the impedance of a single path, but also to effectively improve the integrity of signal transmission, enhance the uniformity of touch sensitivity across the entire screen, and strengthen the anti-interference capability of the overall system.

[0044] It should be noted that when multiple first touch sensing lines Tx1~Txn and multiple second touch sensing lines Rx1~Rxn are divided into multiple groups, the third switching element S3 and the fourth switching element S4 in the second switching circuit are also set to multiple accordingly. Each group of first touch sensing lines shares one third switching element S3, and each group of second touch sensing lines shares one fourth switching element S4.

[0045] Figure 4 This is a schematic diagram of the structure of a touch screen provided in the second embodiment of this application. Figure 4 As shown, the main difference between this embodiment and the first embodiment described above is that the capacitive touch unit 130 adopts a double-sided offset driving mode for the first touch sensing lines Tx1 to Txn to improve the touch signal-to-noise ratio and anti-interference capability.

[0046] In this embodiment, the first ends of multiple first touch sensing lines Tx1 to Txn are connected in parallel to serve as the first input terminal of the capacitive touch driving signal, and the second ends of multiple first touch sensing lines Tx1 to Txn are connected in parallel to serve as the second input terminal of the capacitive touch driving signal. Both the first and second input terminals are connected to the capacitive touch unit 130, meaning that the capacitive touch driving signal is synchronously input from the first and second ends of the first touch sensing lines Tx1 to Txn. This not only effectively suppresses display noise and improves touch performance, but also serves as a signal redundancy path. When a drive line on one side fails, the normal drive signal on the other side can still maintain basic touch functionality, thus enhancing the reliability of the touch system and improving production yield.

[0047] In this embodiment, the first switching circuit further includes a fifth switching element S5. The control terminal of the fifth switching element S5 is connected to the first signal output terminal of the mode control unit, the first path terminal of the fifth switching element S5 is connected to the capacitive touch unit 130, and the second path terminal of the fifth switching element S5 is connected to the second terminals of the first touch sensing lines Tx1 to Txn. When the first enable signal EN1 is valid, the fifth switching element S5 is in the on state, controlling the capacitive touch driving signal to be input from the second terminals of the first touch sensing lines Tx1 to Txn, so that the first touch sensing lines Tx1 to Txn are in a double-sided offset driving mode. The specific equivalent connection circuit is as follows: Figure 5 As shown. When multiple first touch sensing lines Tx1 to Txn are divided into multiple groups, the fifth switching element S5 is set to multiple accordingly, and each group of first touch sensing lines can share one fifth switching element S5.

[0048] In other embodiments, the mode control unit may also include a third signal output terminal, with the control terminal of the fifth switching element S5 connected to the third signal output terminal. In capacitive touch mode, when the drive mode selection signal output by the third signal output terminal is in the first state, the fifth switching element S5 is in the on state, and the first touch sensing lines Tx1 to Txn are in a double-sided offset drive mode; when the drive mode selection signal output by the third signal output terminal is in the second state, the fifth switching element S5 is in the off state, and the first touch sensing lines Tx1 to Txn are in a single-sided drive mode. Thus, the capacitive touch drive mode can be switched according to usage requirements, improving system flexibility.

[0049] In this embodiment, the switching of the touch screen's touch working mode (i.e., capacitive touch mode or electromagnetic touch mode) can be triggered by the user or intelligently determined by the system based on the usage scenario. The triggering mechanism is not limited to a specific form; those skilled in the art can flexibly select or combine multiple methods according to product design requirements. For example, switching can be based on user input, meaning the user can actively issue a switching command through specific physical or virtual control elements. For instance, on a laptop integrating the touch screen, this can be achieved through dedicated function keys, combination keys, touchpad gestures, or a soft switch on the screen. Intelligent switching can also be based on context awareness, meaning the system can integrate various sensors and recognition algorithms to automatically determine and switch to the appropriate working mode. For example, by using a built-in camera combined with visual recognition algorithms, it can detect whether the user is using a finger or an electromagnetic pen; or by using pressure sensors, proximity sensors, and AI behavior analysis based on handwriting and penmanship features, it can intelligently infer the current interaction intent, thereby achieving seamless automatic mode switching. Alternatively, switching can be based on application context, meaning the operating system or application can automatically request the touch screen to switch modes based on the currently running application type or the tool selected by the user. For example, when a user opens drawing software and selects the brush tool, the system automatically switches to electromagnetic touch mode; when switching back to the regular desktop or browser, it automatically reverts to capacitive touch mode. A combination of the above mechanisms, or other triggering methods known in the art, can also be used. It should be noted that the mode control unit of this application is configured to receive and respond to instructions from one or more of the above triggering mechanisms, thereby achieving flexible, efficient, and intelligent switching between the two touch modes, further improving user experience and interaction efficiency.

[0050] Optionally, the switching element in the above embodiments of this application can be a metal-oxide-semiconductor transistor or a bipolar transistor, etc., and this application does not limit it.

[0051] In summary, the touchscreen provided in this embodiment integrates capacitive and electromagnetic touch functions on the same touchscreen by reusing the first and second touch sensing lines and dynamically reconstructing the electrical connection relationship of the first and second touch sensing lines according to the mode control signal of the first or second state. This allows the same touchscreen to support both finger touch and high-precision electromagnetic pen writing, and can be flexibly switched according to usage needs, greatly improving the user experience and application range of the product. Furthermore, it supports different capacitive touch driving modes such as single-sided and double-sided offset, which can adapt to different performance and cost requirements.

[0052] Based on the same inventive concept as the foregoing embodiments, this application also provides an electronic device. This electronic device integrates a touchscreen as described in any of the foregoing embodiments.

[0053] Applying the touchscreen of this invention to electronic devices enables the devices to combine a smooth finger touch experience with high-precision electromagnetic pen input capabilities, thereby adapting to a wide range of application scenarios from daily operation to professional drawing, significantly improving the device's interactive diversity and user experience. The electronic device can be, but is not limited to, a laptop, tablet, all-in-one computer, drawing tablet, smart interactive flat panel, foldable mobile device, or other terminal products with display and touch control requirements. The touchscreen can serve as the main display and input interface of the electronic device; its specific structure, operating mode, and control method can be referred to the foregoing embodiments, and will not be repeated here.

[0054] 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.

[0055] In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0056] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A touch screen, characterized in that, Includes a touch panel and a touch mode switching circuit; The touch panel includes a substrate and a multiplexed touch circuit layer disposed on the substrate. The multiplexed touch circuit layer includes multiple first touch sensing lines and multiple second touch sensing lines. The touch mode switching circuit is used to generate mode control signals for the first state or the second state; The mode control signal in the first state is used to control the first touch sensing line and the second touch sensing line to form a first connection relationship in order to perform capacitive touch detection; The mode control signal in the second state is used to control the first touch sensing line and the second touch sensing line to form a second connection relationship in order to perform electromagnetic touch detection.

2. The touch screen according to claim 1, characterized in that, It also includes a capacitive touch unit and an electromagnetic touch unit, both of which are connected to the first touch sensing line and the second touch sensing line; When the capacitive touch unit responds to the mode control signal of the first state, it is used to output a capacitive touch drive signal to the first touch sensing line and receive the capacitive touch sensing signal fed back by the second touch sensing line. When the electromagnetic touch unit responds to the mode control signal of the second state, it outputs an electromagnetic touch excitation signal to the first touch sensing line and detects the electromagnetic touch resonance signal fed back by the second touch sensing line.

3. The touch screen according to claim 2, characterized in that, The capacitive touch unit uses a single-sided driving mode or a double-sided offset driving mode for the first touch sensing line. In the single-sided driving mode, the first end of the first touch sensing line is connected to the capacitive touch unit, and the capacitive touch driving signal is input from the first end of the first touch sensing line; In the dual-sided offset driving mode, both the first end and the second end of the first touch sensing line are connected to the capacitive touch unit, and the capacitive touch driving signal is input from the first end and the second end of the first touch sensing line.

4. The touch screen according to claim 3, characterized in that, The touch mode switching circuit includes a mode control unit, which includes a first signal output terminal for outputting a first enable signal and a second signal output terminal for outputting a second enable signal. When the first enable signal is valid and the second enable signal is invalid, a mode control signal is formed for the first state. When the first enable signal is invalid and the second enable signal is valid, a mode control signal is generated to form the second state.

5. The touch screen according to claim 4, characterized in that, The touch mode switching circuit further includes a first switch circuit, which is connected to the first signal output terminal, the first touch sensing line and the second touch sensing line. When the first switching circuit responds to a valid first enable signal, it controls multiple first touch sensing lines and multiple second touch sensing lines to be in parallel to form the first connection relationship. When the first switching circuit responds to an invalid first enable signal, it controls multiple first touch sensing lines and multiple second touch sensing lines to be in series to form the second connection relationship.

6. The touch screen according to claim 5, characterized in that, The touch mode switching circuit further includes a second switch circuit, which is connected to the second signal output terminal, the first touch sensing line, and the second touch sensing line. When the second switching circuit responds to a valid second enable signal, it controls the connection of the first touch sensing line and the second touch sensing line to ground. When the second switching circuit responds to an invalid second enable signal, it controls the first touch sensing line and the second touch sensing line to disconnect from ground.

7. The touch screen according to claim 5, characterized in that, The first switching circuit includes a plurality of first switching elements and a plurality of second switching elements; The control terminal of the first switching element is connected to the first signal output terminal, and the first path terminal and the second path terminal of the first switching element are respectively connected to two adjacent first touch sensing lines. The control terminal of the second switching element is also connected to the first signal output terminal, and the first path terminal and the second path terminal of the second switching element are respectively connected to two adjacent second touch sensing lines. When the first enable signal is valid, both the first switching element and the second switching element are in the on state; When the first enable signal is invalid, both the first switching element and the second switching element are in the off state; The first switching circuit further includes a fifth switching element. The control terminal of the fifth switching element is connected to the first signal output terminal, the first path terminal of the fifth switching element is connected to the capacitive touch unit, and the second path terminal of the fifth switching element is connected to the second end of the first touch sensing line. When the first enable signal is valid, the fifth switching element is in the on state, controlling the capacitive touch driving signal to be input from the second end of the first touch sensing line, so that the first touch sensing line is in the double-sided offset driving mode.

8. The touch screen according to claim 6, characterized in that, The second switching circuit includes a third switching element and a fourth switching element; The control terminal of the third switching element is connected to the second signal output terminal, the first path terminal of the third switching element is connected to the first touch sensing line, and the second path terminal of the third switching element is connected to ground. The control terminal of the fourth switching element is also connected to the second signal output terminal, the first path terminal of the fourth switching element is connected to the second touch sensing line, and the second path terminal of the fourth switching element is connected to ground. When the second enable signal is valid, both the third and fourth switching elements are in the ON state; When the second enable signal is invalid, both the third and fourth switching elements are in the off state.

9. The touch screen according to claim 1, characterized in that, The multiplexed touch circuit layer includes a first conductive layer and a second conductive layer that are mutually insulated. The plurality of first touch sensing lines are arranged along a first direction on the first conductive layer; The plurality of second touch sensing lines are arranged along the second direction on the second conductive layer; The first direction intersects with the second direction.

10. The touch screen according to claim 2, characterized in that, The capacitive touch unit includes multiple output terminals of capacitive touch driving signals and multiple input terminals of capacitive touch sensing signals; the electromagnetic touch unit includes multiple output terminals of electromagnetic touch excitation signals and multiple input terminals of electromagnetic touch resonant signals. The multiple first touch sensing lines are divided into multiple first touch sensing line groups. The multiple first touch sensing lines in each first touch sensing line group are connected to the output terminal of a capacitive touch driving signal and the output terminal of an electromagnetic touch excitation signal. The multiple second touch sensing lines are divided into multiple second touch sensing line groups. The multiple second touch sensing lines in each second touch sensing line group are connected to the input terminal of one capacitive touch sensing signal and the input terminal of one electromagnetic touch resonant signal.

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