Touch screen, touch processing device, touch processing method and touch system

Abstract

This invention relates to a touch screen, a touch processing device, a touch processing method, and a touch system. The touch screen includes: a plurality of first electrodes parallel to a first axis and a plurality of second electrodes parallel to a second axis, overlapping a display screen; and an opaque, non-conductive frame surrounding the display screen and superimposed on its edge. The center lines of any two of the plurality of second electrodes are separated by a second distance. The distance between the center line of the first second electrode and the second side of the frame parallel to the second axis is less than or equal to one-quarter of the second distance. The distance between the center line of the last second electrode and the fourth side of the frame parallel to the second axis is less than or equal to one-quarter of the second distance.

Description

Technical Field

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

[0002] The touchscreen has multiple touch electrodes, each connected to a touch processing device. This touch processing device can detect external objects, such as fingers or styluses, that are hovering over or touching the touchscreen, using the principle of capacitive sensing.

[0003] Please refer to Figure 1 The image shows a top view of a touchscreen 100. The touchscreen 100 has a bezel 130, which contains the display screen and the touch area where the touch electrodes are distributed. The bezel 130 may be made of a non-conductive material to protect the edges of the display screen and to accommodate the connection cables between the touch electrodes and the touch processing device.

[0004] There is an edge region 120 near the border 130, and the normal region 110 is within the edge region 120. Due to the arrangement and distribution of the touch electrodes, the touch electrode density in the edge region 120 is lower than that in the normal region 110. When corresponding to the same external object touch, the capacitance change in the edge region 120 is lower, which causes the touch processing device to have a lower sensing accuracy for the edge region 120.

[0005] For example, in Microsoft's specifications for Windows Hardware Developers (https: / / docs.microsoft.com / en-us / windows-hardware / design / component-guidelines / touchscreen-tests), the touch accuracy testing standard defines the edge area 120 as a 3.5mm area along the inside of the bezel. The touch position error within this edge area 120 is ±2.0mm, while the touch position error within the normal area 110 is ±1.0mm.

[0006] When an external object floats on the touch screen, the capacitance change of the touch electrodes is smaller than when the object touches the screen. Therefore, the detection error of a floating object in the edge area 120 is larger than the detection error of a touching object.

[0007] Please refer to Figure 2The image shows a partial top view of the lower left corner of a touchscreen 100 in the prior art. The touchscreen 100 includes two types of touch electrodes: a black horizontal first electrode 210 and a white vertical second electrode 220. The first electrode 210 and the second electrode 220 can be located on different electrode layers or on the same electrode layer. Each touch electrode includes multiple diamond-shaped conductive sheets connected by circuits. When the first electrode 210 and the second electrode 220 are located on the same electrode layer, the circuits between the conductive sheets can be connected in a bridge-like manner to prevent the first electrode 210 from touching the second electrode 220.

[0008] The pitch between each second electrode 220 is fixed. The edge pitch of the first second electrode 220A on the left is different from the aforementioned pitch. When an external object is suspended or in contact with the vicinity of the first second electrode 220A, the capacitance change caused by the external object to the other second electrodes 220 is small, resulting in a large error.

[0009] Therefore, there is an urgent need for an improved design of touch electrodes that can reduce detection errors of floating or contacting objects in the edge area. Summary of the Invention

[0010] According to an embodiment of this application, a touch screen is provided, comprising: a display screen; a plurality of first electrodes parallel to a first axis and a plurality of second electrodes parallel to a second axis overlapping the display screen; and an opaque and non-conductive frame surrounding the display screen and superimposed on the edge of the display screen, wherein the first axis is perpendicular to the second axis, the plurality of first electrodes and the plurality of second electrodes overlap each other, the center lines of any two of the plurality of second electrodes are separated by a second distance, the distance between the center line of the first of the plurality of second electrodes and the second side of the frame parallel to the second axis on the first axis is less than or equal to one-quarter of the second distance, and the distance between the center line of the last of the plurality of second electrodes and the fourth side of the frame parallel to the second axis on the first axis is less than or equal to one-quarter of the second distance.

[0011] Preferably, in order to accommodate the double-layer structure of the touch electrode, the plurality of first electrodes and the plurality of second electrodes are located in different layers, each of the first electrodes is rectangular and each of the second electrodes is rectangular.

[0012] Preferably, in order to accommodate the single-layer structure of the touch electrode, the plurality of first electrodes and the plurality of second electrodes are located on the same layer, each of the first electrodes includes a plurality of interconnected first rectangular conductive sheets, each of the second electrodes includes a plurality of interconnected second rectangular conductive sheets, and the plurality of first rectangular conductive sheets or the plurality of second rectangular conductive sheets are connected in a bridge manner.

[0013] Preferably, in order to increase the detection capability of the edge area of ​​the touch screen, the distance between the center line of the first second electrode and the second side on the first axis is less than or equal to half the width of the second electrode, and the distance between the center line of the last second electrode and the fourth side on the first axis is less than or equal to half the width of the second electrode.

[0014] Preferably, in order to increase the detection capability of the edge area of ​​the touch screen, the first second electrode and the last second electrode are located between the frame and the touch screen.

[0015] Preferably, in order to increase the detection capability of the edge area of ​​the touch screen, the center lines of any two of the plurality of first electrodes are separated by a first spacing, the distance between the center line of the first electrode and the first side of the frame parallel to the first axis on the second axis is less than or equal to one-quarter of the first spacing, and the distance between the center line of the last electrode and the third side of the frame parallel to the first axis on the second axis is less than or equal to one-quarter of the first spacing.

[0016] Preferably, in order to increase the detection capability of the edge area of ​​the touch screen, the distance between the center line of the first electrode and the first side on the second axis is less than or equal to half the width of the first electrode, and the distance between the center line of the last electrode and the third side on the second axis is less than or equal to half the width of the first electrode.

[0017] Preferably, in order to increase the detection capability of the edge area of ​​the touch screen, the first electrode and the last electrode are located between the frame and the touch screen.

[0018] Preferably, for ease of design, the width of the first electrode is the same as the width of the second electrode.

[0019] Preferably, in order to conform to the size of the fingertips of an average person, the second spacing is 10mm and the width of the second electrode is 2mm.

[0020] According to an embodiment of this application, a touch processing device is provided for controlling a touch screen as described above, wherein the number of the plurality of second electrodes is N+2, where N is a positive integer greater than 2. The touch processing device includes: a driving circuit for sequentially providing driving signals to the plurality of first electrodes; a sensing circuit including N+1 difference circuits, wherein each difference circuit is used to sense the driving signal sensed by two adjacent second electrodes each time the driving circuit provides the driving signal, so as to obtain a one-dimensional first sensing array with N+1 elements; and a processor module connected to the driving circuit and the sensing circuit for sequentially receiving the plurality of one-dimensional first sensing arrays to form a two-dimensional first sensing array; and detecting external objects approaching or touching the touch screen based on the two-dimensional first sensing array.

[0021] Preferably, in order to avoid electromagnetic interference near the bezel, the processor module is further configured to: remove the first array element and the last array element of the received plurality of one-dimensional first arrays respectively to obtain a plurality of one-dimensional second sensing arrays; form a two-dimensional second sensing array based on the plurality of one-dimensional second sensing arrays; and detect external objects approaching or touching the touch screen based on the two-dimensional second sensing array.

[0022] Preferably, in order to detect a floating or touching external object that enters the touch screen from the bezel, when in the first mode, the touch processing device is further used to report the external object detected by the two-dimensional first sensing array to the host, wherein the first mode is used to detect a floating or touching external object that enters the touch screen from the bezel.

[0023] Preferably, in order to detect floating or contacting external objects in the non-edge area of ​​the touch screen or to increase the accuracy of detecting floating or contacting positions, when in the second mode, the touch processing device is further used to report the external objects detected by the two-dimensional second sensing array to the host, wherein the second mode is used to detect floating or contacting external objects in the non-edge area of ​​the touch screen.

[0024] Preferably, in order to accommodate the fact that the edge area of ​​the touch screen is more susceptible to electromagnetic interference, the gain values ​​of the operational amplifiers of the first and last difference circuits in the N+1 difference circuits are different from the gain values ​​of the operational amplifiers of the remaining N-1 difference circuits.

[0025] According to an embodiment of this application, a touch processing method is provided for controlling a touch screen as described above, wherein the number of the plurality of second electrodes is N+2, where N is a positive integer greater than 2, and the touch processing method includes: sequentially providing driving signals to the plurality of first electrodes; each time the driving signal is provided, using each of the N+1 differential circuits to sense the driving signal sensed by two adjacent second electrodes, so as to obtain a one-dimensional first sensing array with N+1 elements; sequentially receiving the plurality of one-dimensional first sensing arrays to form a two-dimensional first sensing array; and detecting external objects approaching or touching the touch screen based on the two-dimensional first sensing array.

[0026] Preferably, to avoid electromagnetic interference near the frame, the method further includes: removing the first and last array elements of the received plurality of one-dimensional first arrays to obtain a plurality of one-dimensional second sensing arrays; forming a two-dimensional second sensing array based on the plurality of one-dimensional second sensing arrays; and detecting external objects approaching or touching the touch screen based on the two-dimensional second sensing array.

[0027] Preferably, in order to detect a floating or touching external object that enters the touch screen from the bezel, the method further includes: when in a first mode, reporting the external object detected by the two-dimensional first sensing array to the host, wherein the first mode is used to detect a floating or touching external object that enters the touch screen from the bezel.

[0028] Preferably, in order to detect floating or contacted external objects in the non-edge area of ​​the touch screen or to increase the accuracy of detecting floating or contacted positions, the method further includes: when in the second mode, reporting the external objects detected by the two-dimensional second sensing array to the host, wherein the second mode is used to detect floating or contacted external objects in the non-edge area of ​​the touch screen.

[0029] Preferably, in order to accommodate the fact that the edge area of ​​the touch screen is more susceptible to electromagnetic interference, the gain values ​​of the operational amplifiers of the first and last difference circuits in the N+1 difference circuits are different from the gain values ​​of the operational amplifiers of the remaining N-1 difference circuits.

[0030] According to an embodiment of this application, a touch system is provided, including the aforementioned touch processing device and touch screen.

[0031] According to an embodiment of this application, a touch system is provided, including the aforementioned touch processing device, touch screen, and host.

[0032] This application proposes an improved design for the edge touch electrodes of a touch screen, which can reduce detection errors of the edge area for floating or contacting objects. This application also proposes a touch processing device and method for a touch screen, utilizing differential circuitry to reduce the influence of electromagnetic interference on the edge area of ​​the touch screen. Attached Figure Description

[0033] Figure 1 This is a top view of a touchscreen 100.

[0034] Figure 2 This is a partial top view of the lower left corner of the touch screen 100 in the existing technology.

[0035] Figure 3 This is a partial top view of the lower left corner of a touch screen 300 according to an embodiment of this application.

[0036] Figure 4 This is a partial top view of the lower left corner of a touch screen 400 according to an embodiment of this application.

[0037] Figure 5A This is a schematic diagram of the edge spacing according to an embodiment of the present application.

[0038] Figure 5B This is a schematic diagram of the edge spacing according to an embodiment of the present application.

[0039] Figure 5C This is a schematic diagram of the edge spacing according to an embodiment of the present application.

[0040] Figure 6 This is a partial top view of the lower left corner of a touch screen 600 according to an embodiment of this application.

[0041] Figure 7 This is a block diagram of a touch system 700 according to an embodiment of the present invention.

[0042] Figure 8 This is a schematic diagram of a difference circuit 800 according to an embodiment of this application.

[0043] Figure 9 This is a partial schematic diagram of a sensing circuit module 713 according to an embodiment of this application.

[0044] Figure 10 This is a block diagram of a touch processing method 1000 according to an embodiment of this application.

[0045] [Explanation of Key Component Symbols]

[0046] 100: Touchscreen 110: Normal area

[0047] 120: Edge area 130: Border

[0048] 210: First electrode 210A: First electrode

[0049] 220: Second electrode 220A: Second electrode

[0050] 300: Touchscreen 310: First electrode

[0051] 310A: First electrode; 320: Second electrode

[0052] 320A: Second electrode; 320i: Second electrode

[0053] 320i+1: Second electrode; 330: Frame

[0054] 400: Touchscreen 600: Touchscreen

[0055] 610: First electrode; 610A: First electrode

[0056] 620: Second electrode; 620A: Second electrode

[0057] 700: Touch system; 710: Touch processing device

[0058] 711: Network Connection 712: Drive Circuit Module

[0059] 713: Sensing circuit module; 714: Processor module

[0060] 715: Interface Module; 730: Stylus

[0061] 735: Touchpad eraser; 740: Main unit

[0062] 741: Input / Output Interface Module; 742: Central Processing Unit Module

[0063] 743: Graphics Processor Module; 744: Memory Module

[0064] 745: Network Interface Module; 746: Memory Module

[0065] 800: Differential circuit; 800A: First differential circuit

[0066] 800Z: Last differential circuit; 810: Operational amplifier

[0067] 820: Output value; 910: First differential circuit group

[0068] 920: Second differential circuit group; 1000: Touch processing method

[0069] 1010~1099: Step R1: Resistor

[0070] R2: Resistor R3: Resistor

[0071] R4: Resistor Detailed Implementation

[0072] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be described in detail below. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0073] The terms "first," "second," "third," etc. (if present) in the specification, claims, and drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the described objects can be used interchangeably where appropriate. In the description of this application, "a plurality of" means two or more unless otherwise expressly and specifically defined. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software, in one or more hardware circuits or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0074] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection via an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the aforementioned terms in this application according to the specific circumstances.

[0075] To make the objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the drawings and specific embodiments.

[0076] Please refer to Figure 3 The image shown is a partial top view of the lower left corner of a touchscreen 300 according to an embodiment of this application. The touchscreen 300 may include multiple elongated first electrodes 310 and multiple elongated second electrodes 320. The first electrodes 310 and the second electrodes 320 may be located in different electrode layers. Although in Figure 3The first electrode 310 is displayed above the second electrode 320. This application does not limit the vertical order of the first or second electrodes. The spacing between each second electrode 320 can be the same, which is the distance between the center lines of adjacent second electrodes 320. The first electrode 310 and the second electrode 320 can be formed of a transparent conductive material to expose the display screen below. The transparent conductive material can contain indium tin oxide (ITO). The bezel 330 covers the electrode layers of the first electrode 310 and the second electrode 320.

[0077] In implementing mutual capacitance sensing, a drive signal can be emitted from one of the multiple first electrodes 310, and then the drive signals sensed by the multiple second electrodes 320 can be sensed to form a one-dimensional sensing array. After emitting drive signals to all the first electrodes 310 in turn and obtaining multiple one-dimensional sensing arrays, the multiple one-dimensional sensing arrays can be combined into a two-dimensional sensing array. Based on this two-dimensional sensing array, external objects that are suspended or in contact with the touch screen 300 can be detected.

[0078] Because the first second electrode 320A is elongated and does not have a conductive sheet like the first second electrode 220A, it can be closer to the frame 330. This also causes the remaining second and third second electrodes 320 to be closer to the frame 330. Since the edge pitch between the first second electrode 320A and the frame 330 is narrowed, the area of ​​the edge region 120 is naturally reduced. From another perspective, the detection error of the edge region 120 may also be smaller, improving detection accuracy.

[0079] From the perspective of the production process, and Figure 3 Compared to the embodiments shown, Figure 2 The complex shape of the touch electrodes makes them prone to manufacturing errors. This is especially true when the touch electrodes are on the same electrode layer, requiring the creation of bridges, which further increases the error rate. Therefore, Figure 3 The embodiments shown have the advantages of reducing the probability of errors, increasing production yield, and reducing costs in the manufacturing process.

[0080] In terms of materials used in its production, and Figure 3 Compared to the embodiments shown, Figure 2 The touch electrode shown has a large conductive sheet, requiring more electrode material. Therefore, Figure 3 The illustrated embodiment has the advantage of reducing costs in terms of manufacturing materials.

[0081] Please refer to Figure 4The image shown is a partial top view of the lower left corner of a touchscreen 400 according to an embodiment of this application. Compared to the touchscreen 300, the edge distance between the first electrode 310A and the frame 330 of the touchscreen 400 is also reduced. When a floating active stylus is detected, the touch processing device simply receives the driving signal emitted by the stylus. When the edge distance between the first electrode 310A and the frame 330 is reduced, the error in detecting the stylus at the upper and lower edges of the edge region can also be reduced. Those skilled in the art will understand that the above description of the first electrode 320A can also be applied to the description of the first electrode 310A.

[0082] The first spacing between the first electrodes 310 may not be equal to the second spacing between the second electrodes 320. The first edge spacing between the first electrode 310A and the frame 330 may not be equal to the second edge spacing between the first electrode 320A and the frame 330.

[0083] In one embodiment, the first edge spacing between the first electrode 310A and the lower edge of the frame 330 can be equal to the first edge spacing between the last electrode 310 and the upper edge of the frame 330. The second edge spacing between the first electrode 320A and the left edge of the frame 330 can be equal to the second edge spacing between the last electrode 320 and the right edge of the frame.

[0084] Please refer to Figure 5A The diagram shown is a schematic representation of the edge spacing according to an embodiment of this application. In this embodiment, the edge spacing between the center line of the first second electrode 320A and the left edge of the frame 330 is less than or equal to one-quarter of the spacing between the second electrodes 320.

[0085] For example, when the spacing between the second electrodes 320 is 10 mm and the line width of the second electrodes 320 is 2 mm, then in Figure 5A In this embodiment, the edge spacing will be less than 2.5mm. The distance from the right edge of the first second electrode 320A to the left edge of the frame 330 will be less than 3.5mm, which is less than the 3.5mm range of the edge region 120 defined by Microsoft.

[0086] In other words, in one embodiment, the entire first and last second electrodes 320 must fall into... Figure 1 The edge region 120 shown cannot be within the normal region 110.

[0087] Please refer to Figure 5BThe diagram illustrates the edge spacing according to an embodiment of this application. In this embodiment, the edge spacing between the center line of the first second electrode 320A and the left edge of the frame 330 is less than or equal to half the line width of the second electrode 320. That is, the frame 330 can be located to the left of the center line of the first second electrode 320A. In one embodiment, the frame 330 covers half or less of the first and last second electrodes 320. The first and last second electrodes 320 can still be exposed to the contact area of ​​external objects.

[0088] Please refer to Figure 5C The diagram illustrates the edge spacing according to an embodiment of this application. In this embodiment, the edge spacing between the center line of the first second electrode 320A and the left edge of the frame 330 is less than or equal to one-quarter of the spacing between the second electrodes 320, but the frame 330 completely covers the first second electrode 320A. It can be considered that the frame 330 covers part or all of the edge region 120, so that the remaining exposed touch area is the normal area 110.

[0089] Please refer to Figure 6 The image shown is a partial top view of the lower left corner of a touchscreen 600 according to an embodiment of this application. Figure 3 and Figure 4 In the illustrated embodiment, the first electrode 310 and the second electrode 320 are located in different electrode layers. However... Figure 6 In the illustrated embodiment, the first electrode 610 and the second electrode 620 are located on the same electrode layer. Each touch electrode includes multiple elongated conductive sheets, and the lines between the conductive sheets can be connected in a bridge manner to prevent the first electrode 610 from touching the second electrode 620.

[0090] Please refer to Figure 7 The diagram shown is a block illustration of a touch system 700 according to an embodiment of the present invention. The touch system 700 can be a common desktop, laptop, or tablet personal computer, industrial control computer, smartphone, or other form of computer system with touch functionality.

[0091] The touch system 700 may include a touch processing device 710, a touch panel or screen 300, 400, or 600 connected to the touch processing device, and a host 740 connected to the touch processing device. The touch system 700 may further include one or more styluses 730 and / or touchpads 735. In this application, the touch panel or screen 300 may be generally referred to as a touch screen 300; however, in embodiments lacking display functionality, those skilled in the art will recognize that the touch screen referred to in this application is a touch panel.

[0092] The touchscreen 300 includes multiple first electrodes 310 parallel to a first axis and multiple second electrodes 320 parallel to a second axis. The first electrodes 310 can be interleaved with the multiple second electrodes 320 to form multiple sensing points or sensing areas. Similarly, the second electrodes 320 can be interleaved with the multiple first electrodes 310 to form multiple sensing points or sensing areas. In some embodiments, the first electrode 310 may be referred to as a first touch electrode 310, and the second electrode 320 may be referred to as a second touch electrode 320. The first electrode 310 and the second electrode 320 are also collectively referred to as touch electrodes. In some embodiments applicable to touchscreens 300, 400, and 600, the first electrode 310 and the second electrode 320 are made of a transparent material. Figure 6 In the illustrated embodiment of the touchscreen 600, the first electrode 610 and the second electrode 620 can be on the same electrode layer, and the multiple conductive sheets of each first electrode 610 or second electrode 620 are connected by a bridge. The first electrode 610 and the second electrode 620 can also be on different, stacked electrode layers. Unless otherwise specified, this application is generally applicable to embodiments with a single layer or multiple electrode layers. The first axis and the second axis are generally perpendicular to each other, but this application does not limit the first axis to necessarily being perpendicular to the second axis. In one embodiment, the first axis can be a horizontal axis or the refresh axis of the touchscreen 120.

[0093] The touch processing device 710 may include the following hardware circuit modules: an Interconnection Network module 711, a driving circuit module 712, a sensing circuit module 713, a processor module 714, and an interface module 715. The touch processing device 710 may be implemented within a single integrated circuit, which may contain one or more chips. Alternatively, multiple integrated circuits and interconnecting circuit boards supporting these integrated circuits may be used to implement the touch processing device 710. The touch processing device 710 may also be implemented on the same integrated circuit as the aforementioned host 740, or on the same chip as the aforementioned host 740. In other words, this application does not limit the implementation of the touch processing device 710.

[0094] The connection network module 711 is used to connect to multiple first electrodes 310 and / or multiple second electrodes 320 of the touch screen 300, respectively. The connection network module 711 can accept control commands from the processor module 714 to connect the drive circuit module 712 to any one or more touch electrodes, and also to connect the sensing circuit module 713 to any one or more touch electrodes. The connection network module 711 may include a combination of one or more multiplexers (MUX) to implement the above functions.

[0095] The drive circuit module 712 may include components such as a clock generator, frequency divider, frequency multiplier, phase-locked loop, power amplifier, DC-DC voltage converter, rectifier and / or filter, and is used to provide drive signals to one or more touch electrodes through the connection network module 711 according to the control commands of the processor module 714. Various analog or digital signal modulations can be applied to the drive signals to transmit certain information. The modulation methods include, but are not limited to, frequency modulation (FM), phase modulation (Phase Modulation), amplitude modulation (AM), double-sideband modulation (DSB), single-sideband modulation (SSB-AM), vestigial sideband modulation (Vestigial Sideband Modulation), amplitude shift modulation (ASK), phase shift modulation (PSK), quadrature amplitude modulation (QAM), frequency shift modulation (FSK), continuous phase modulation (CPM), code division multiple access (CDMA), time division multiple access (TDMA), quadrature frequency division multiplexing (OFDM), and pulse width modulation (PWM). The drive signal may contain one or more square waves, sine waves, or any modulated waveform. The drive circuit module 712 may contain one or more channels, each of which can be connected to any one or more touch electrodes through the connection network module 711.

[0096] The sensing circuit module 713 may include components such as an integrator, sampler, clock generator, frequency divider, frequency multiplier, phase-locked loop, power amplifier, operational amplifier, multiplier, DC-DC voltage converter, rectifier, and / or filter. It is used to sense one or more touch electrodes via the connection network module 711 according to the control commands of the processor module 714. When a touch signal is emitted through one touch electrode, another touch electrode can sense the touch signal. The sensing circuit module 713 can cooperate with the modulation method executed by the driving circuit module 712 to demodulate the driving signal sensed by the other touch electrode to recover the information carried by the driving signal. The sensing circuit module 713 may include one or more channels, each channel being connected to one or more touch electrodes via the connection network module 711. Simultaneously, each channel can perform sensing and demodulation.

[0097] In one embodiment, the driving circuit module 712 and sensing circuit module 713 may include analog front-end (AFE) circuitry. In another embodiment, in addition to the analog front-end circuitry, the driving circuit module 712 and sensing circuit module 713 may include digital back-end (DBE) circuitry. When the driving circuit module 712 and sensing circuit module 713 only include analog front-end circuitry, the digital back-end circuitry may be implemented within the processor module 714.

[0098] The processor module 714 may include a digital signal processor (DSP) for connecting the analog front-end circuits of the aforementioned drive circuit module 712 and sensing circuit module 713, and may also connect the digital back-end circuits of the aforementioned drive circuit module 712 and sensing circuit module 713. The processor module 714 may include an embedded processor, non-volatile memory, and volatile memory. The non-volatile memory may store a standard operating system or a real-time operating system, and the applications running under that operating system. The aforementioned operating system and applications contain multiple instructions and data. After these instructions are executed by the processor (including the embedded processor and / or DSP), they can be used to control other modules of the touch processing device 710, including the connection network module 711, the drive circuit module 712, the sensing circuit module 713, and the interface module 715. For example, the processor module 714 may include commonly used 8051 series processors, Intel's i960 series processors, ARM's Cortex-M series processors, etc. This application does not limit the type or number of processors included in the processor module 714.

[0099] The aforementioned instructions and data can be used to implement the various steps mentioned in this application, as well as the processes and methods comprised of these steps. Some instructions can operate independently within the processor module 714, such as arithmetic and logic operations. Other instructions can be used to control other modules of the touch processing device 710; these instructions may include the input / output interface of the processor module 714 to control other modules. Other modules can also provide information to the operating system and / or application executed by the processor module 714 through the input / output interface of the processor module 714. Those skilled in the art should possess general knowledge of computer organization and architecture and can understand that the processes and methods mentioned in this application can be implemented using the aforementioned modules and instructions.

[0100] The aforementioned interface module 715 can include various serial or parallel buses, such as Universal Serial Bus (USB), Integrated Circuit Bus (I2C), PCI, PCI-Express, IEEE 1394, and other industry standard input / output interfaces. The touch processing device 710 is connected to the host 740 through the interface module 715.

[0101] The touch system 700 may include one or more styluses 730 and / or touchpads 735. The stylus 730 or touchpad 735 may be a transmitter that emits electrical signals. It may be an active transmitter that actively emits electrical signals, a passive transmitter that passively emits electrical signals, or a reactive transmitter that emits electrical signals in response to external electrical signals. The stylus 730 or touchpad 735 may include one or more electrodes for synchronously or asynchronously receiving electrical signals from touchscreens 300, 400, or 600, or synchronously or asynchronously emitting electrical signals to touchscreens 300, 400, or 600. These electrical signals may employ one or more modulation methods as described above.

[0102] The stylus 730 or touchpad 735 described above can be a conductor, used to conduct drive signals or ground by using the user's hand or body. The stylus 730 or touchpad 735 described above can be connected to the input / output interface module 741 of the host 740, or other modules under the input / output interface module 741, in a wired or wireless manner.

[0103] The touch processing device 710 can detect one or more external conductive objects, such as human fingers, palms, or passive styluses 730 or touchpads 735, via the touchscreen 300, 400, or 600. It can also detect styluses 730 or touchpads 735 that emit electrical signals. The touch processing device 710 can detect external conductive objects using mutual capacitance or self-capacitance. The stylus 730 or touchpad 735 and the touch processing device 710 can use the aforementioned signal modulation and corresponding signal demodulation methods to transmit information using electrical signals. The touch processing device 710 can use electrical signals to detect one or more proximity positions of the stylus 730 or touchpad 735 to or in contact with the touch screen 300, 400 or 600, the sensor status (e.g., pressure sensor or button) on the stylus 730 or touchpad 735, the direction of the stylus 730 or touchpad 735, or the tilt angle of the stylus 730 or touchpad 735 relative to the plane of the touch screen 300, 400 or 600, etc.

[0104] The host 740 is the main device for controlling the touch system 700, and may include an input / output interface module 741 connected to the interface module 715, a central processing unit module 742, a graphics processing unit module 743, a memory module 744 connected to the central processing unit module 742, a network interface module 745 connected to the input / output interface module 741, and a memory module 746.

[0105] The memory module 746 includes non-volatile memory, common examples of which are hard disks, electronically eraseable read-only memory (EEPROM), or flash memory. The memory module 746 can store a typical operating system and the applications running under that operating system. The network interface module 745 can include a hardware network connection interface with wired and / or wireless connectivity. The network interface module 745 can comply with common industry standards, such as the IEEE 802.11 wireless local area network standard, the IEEE 802.3 wired local area network standard, 3G, 4G, and / or 5G wireless communication network standards, Bluetooth wireless communication network standards, etc.

[0106] The central processing unit (CPU) module 742 can be directly or indirectly connected to the aforementioned input / output interface module 741, graphics processor module 743, memory module 744, network interface module 745, and memory module 746. The CPU module 742 can contain one or more processors or processor cores. Common processors may include x86 and x64 instruction set processors from Indelta, AMD, and VIA Technologies, or ARM instruction set processors from Apple, Qualcomm, and MediaTek. It may also include other forms of Complex Instruction Set Computing (CISC) or Reduced Instruction Set Computing (RISC) processors. The aforementioned operating system and applications contain multiple instructions and data corresponding to the aforementioned instruction sets. After these instructions are executed by the CPU module 742, they can be used to control other modules of the touch system 100.

[0107] The optional graphics processing unit (GPU) module 743 is typically used to handle calculations related to graphics output. This GPU module 743 can be connected to the aforementioned touchscreens 300, 400, or 600 to control their output. In some applications, the host computer 740 may not require dedicated processing by the GPU module 743; instead, the central processing unit (CPU) module 742 can directly perform the calculations related to graphics output.

[0108] The host 740 may also include other... Figure 7Components or devices not shown include, for example, audio input / output interfaces, keyboard input interfaces, mouse input interfaces, trackball input interfaces, and / or other hardware modules. Those skilled in the art, possessing general knowledge of computer architecture and structure, will understand that the touch system 700 mentioned in this application is merely illustrative; for other parts related to the inventive features provided in this application, please refer to the specification and the claims.

[0109] Please refer to Figure 8 The diagram shown is a schematic of a difference circuit 800 according to an embodiment of this application. The difference circuit 800 is part of the sensing circuit module 713. The difference circuit 800 includes an operational amplifier 810 and four resistors R1 to R4. Through the arrangement of the connection network module 711, the difference circuit 800 is connected to two adjacent second electrodes 300i and 300i+1 as input terminals, and generates an output value 820 to other parts of the sensing circuit module 713, such as a sampler, an analog-to-digital converter, etc.

[0110] When two adjacent second electrodes are not affected by different capacitance changes caused by external objects, the output value 820 of the operational amplifier 810 is zero, meaning the sensing difference between the two second electrodes is zero. When the two adjacent second electrodes are affected by external objects, causing different changes in the sensed drive signal, the output value 820 of the operational amplifier 810 will not be zero. The sensing circuit module 713 can then calculate the relative position of the external object and the corresponding second electrode based on the magnitude of its output value.

[0111] Please refer to Figure 9 As shown, it is a partial schematic diagram of a sensing circuit module 713 according to an embodiment of this application. Figure 9 In the illustrated embodiment, the sensing circuit module 713 includes a plurality of differential circuits 800. Each differential circuit 800 is connected to two adjacent second electrodes, such as... Figure 3 and Figure 4 The second electrode 320 shown, or as... Figure 6 The second electrode 620 is shown. The first input terminal of the first differential circuit 800A is connected to the first second electrode 320A, and the second input terminal of the last differential circuit 800Z is connected to the last second electrode 320Z. When the touch screen 300, 400, or 600 has N+2 second electrodes, the sensing circuit module 713 has (N+1) differential circuits 800, forming a first differential circuit group 910. The output value 820 of each differential circuit 800 can form a one-dimensional first sensing array with (N+1) elements, where N is a positive integer greater than 2.

[0112] In the above mutual capacitance detection, multiple one-dimensional first sensing arrays can be used to form a two-dimensional first sensing array, and then this two-dimensional first sensing array can be used to detect external objects floating above the touch screen or external objects touching the touch screen.

[0113] In some embodiments, after N+1 difference circuits 800, N second difference circuits can be connected respectively. The input of each second difference circuit is two adjacent difference circuits 800. Therefore, N second difference circuits can also form a one-dimensional dual-difference sensing array. Those skilled in the art will understand that multiple one-dimensional dual-difference sensing arrays can be used to form a two-dimensional dual-difference sensing array, and then this two-dimensional dual-difference sensing array can be used to detect external objects floating above the touch screen, or external objects touching the touch screen.

[0114] In some embodiments, the second difference circuit may include arithmetic and logic operation circuitry to perform numerical calculations, without actually using a differential. Each second difference circuit may correspond to the sensing results of the three second electrodes. In other embodiments, the functions of all the second difference circuits can be implemented by using arithmetic and logic operation circuitry to execute instructions.

[0115] However, under certain circumstances, the first and last second electrodes are susceptible to external electromagnetic interference, causing the output values ​​of the first differential circuit 800A or the last differential circuit 800Z to be affected by electromagnetic interference. For example, a user's fingers holding the frame or placing a stylus next to the frame can continuously cause electromagnetic interference to the first and / or last second electrodes. When this occurs, the output value of the second differential circuit group 920 can be used as a one-dimensional second sensing array with (N-1) elements. This one-dimensional second sensing array is essentially a one-dimensional first sensing array with the first and last array elements removed.

[0116] Similarly, in the mutual capacitance detection described above, multiple one-dimensional second sensing arrays can be combined to form a two-dimensional second sensing array. This two-dimensional second sensing array can then be used to detect external objects floating above the touchscreen or external objects touching the touchscreen. Since the two-dimensional second sensing array has fewer elements than the two-dimensional first sensing array, the range of external objects that can be detected is smaller.

[0117] Similarly, in the above-mentioned mutual capacitance detection, a one-dimensional second sensing array with N-1 elements can be used to obtain a one-dimensional dual-difference second sensing array with N-2 elements. Those skilled in the art will understand that multiple one-dimensional dual-difference second sensing arrays can be used to form a two-dimensional dual-difference second sensing array, and this two-dimensional dual-difference sensing array can then be used to detect external objects floating above the touchscreen, or external objects touching the touchscreen.

[0118] When subjected to electromagnetic interference, the output values ​​of the first differential circuit 800A and the last differential circuit 800Z are often saturated. In other words, the upper or lower limit of the output value has been reached. The sensing circuit module 713 cannot determine its value. However, the output values ​​of the remaining differential circuits 800 are between the upper and lower limits. Therefore, this application only needs to use the output of the second differential circuit group 920 to obtain the touch result of the normal area 110 in the middle of the touch screen, without abandoning the detection of the entire touch screen due to electromagnetic interference of the first and / or last second electrodes. It can also avoid errors in the detection of the normal area 110 in the middle of the entire touch screen due to the reference to the result of electromagnetic interference.

[0119] In some embodiments, when it is necessary to detect hovering or touching gestures that enter the touch screen from the edge, the touch processing device can use the output of the first differential circuit group 910 to detect them as early as possible. Figure 1 The external object that is suspended or in contact with the edge region 120 shown.

[0120] In some embodiments, the touch processing device may use the output of the second differential circuit group 920 in order to increase the accuracy of detecting the hover or contact position or to avoid surrounding electromagnetic interference.

[0121] In some embodiments, the gain values ​​of the operational amplifiers in the first differential circuit 800A and the last differential circuit 800Z can be adjusted while maintaining the gain values ​​of the remaining differential circuits 800. In other words, the gain values ​​of the first differential circuit 800A and the last differential circuit 800Z are different from the gain values ​​of the remaining differential circuits 800 to adapt to ambient electromagnetic interference. This can be calibrated at the factory or during power-on to obtain the gain values ​​of the first differential circuit 800A and the last differential circuit 800Z.

[0122] Please refer to Figure 10 The diagram shown is a block illustration of a touch processing method 1000 according to an embodiment of this application. This touch processing method 1000 can be applied to... Figure 7The touch system 700 shown is particularly the touch processing device 710. In one embodiment, the processor module 714 can be executed using instructions and data stored in non-volatile memory to implement the touch processing method 1000. This application does not limit the execution order of any two steps if there is no causal relationship between them. The touch processing method 1000 can begin with step 1010, used to detect the entire touch screen 300, 400, or 600.

[0123] Step 1010: Provide a drive signal to one of the plurality of first electrodes.

[0124] Step 1020: While step 1010 is being executed, each of the N+1 difference circuits in the sensing circuit module is used to sense the driving signal sensed by the two adjacent second electrodes, so as to obtain a one-dimensional first sensing array with N+1 elements.

[0125] Step 1030: Determine whether a drive signal has been provided to all the first electrodes on the touch screen. If there are still first electrodes that have not been provided with a drive signal, proceed to step 1010. If all the first electrodes have been provided with a drive signal, proceed to step 1040.

[0126] Step 1040: Determine which mode is in. If in mode 1, proceed to step 1050; if in mode 2, proceed to step 1070.

[0127] Step 1050: According to the order of the driven first electrodes, combine all the one-dimensional first sensing arrays into a two-dimensional first sensing array.

[0128] Step 1060: Detect external objects that are close to or in contact with the touch screen based on the two-dimensional first sensing array.

[0129] Step 1070: Remove the first and last array elements of the received multiple one-dimensional first arrays to form multiple one-dimensional second sensing arrays.

[0130] Step 1080: According to the order of the driven first electrodes, combine all the one-dimensional second sensing arrays into a two-dimensional second sensing array.

[0131] Step 1090: Detect external objects that are close to or in contact with the touch screen based on the two-dimensional second sensing array.

[0132] Step 1099: Report the external objects detected in step 1060 or 1090 to the host.

[0133] In one embodiment, step 1020 may further include performing a difference operation on adjacent elements of the one-dimensional first sensing array to form a new one-dimensional first sensing array.

[0134] According to an embodiment of this application, a touch screen is provided, comprising: a display screen; a plurality of first electrodes parallel to a first axis and a plurality of second electrodes parallel to a second axis overlapping the display screen; and an opaque and non-conductive frame surrounding the display screen and superimposed on the edge of the display screen, wherein the first axis is perpendicular to the second axis, the plurality of first electrodes and the plurality of second electrodes overlap each other, the center lines of any two of the plurality of second electrodes are separated by a second distance, the distance between the center line of the first of the plurality of second electrodes and the second side of the frame parallel to the second axis on the first axis is less than or equal to one-quarter of the second distance, and the distance between the center line of the last of the plurality of second electrodes and the fourth side of the frame parallel to the second axis on the first axis is less than or equal to one-quarter of the second distance.

[0135] Preferably, in order to accommodate the double-layer structure of the touch electrode, the plurality of first electrodes and the plurality of second electrodes are located in different layers, each of the first electrodes is rectangular and each of the second electrodes is rectangular.

[0136] Preferably, in order to accommodate the single-layer structure of the touch electrode, the plurality of first electrodes and the plurality of second electrodes are located on the same layer, each of the first electrodes includes a plurality of interconnected first rectangular conductive sheets, each of the second electrodes includes a plurality of interconnected second rectangular conductive sheets, and the plurality of first rectangular conductive sheets or the plurality of second rectangular conductive sheets are connected in a bridge manner.

[0137] Preferably, in order to increase the detection capability of the edge area of ​​the touch screen, the distance between the center line of the first second electrode and the second side on the first axis is less than or equal to half the width of the second electrode, and the distance between the center line of the last second electrode and the fourth side on the first axis is less than or equal to half the width of the second electrode.

[0138] Preferably, in order to increase the detection capability of the edge area of ​​the touch screen, the first second electrode and the last second electrode are located between the frame and the touch screen.

[0139] Preferably, in order to increase the detection capability of the edge area of ​​the touch screen, the center lines of any two of the plurality of first electrodes are separated by a first spacing, the distance between the center line of the first electrode and the first side of the frame parallel to the first axis on the second axis is less than or equal to one-quarter of the first spacing, and the distance between the center line of the last electrode and the third side of the frame parallel to the first axis on the second axis is less than or equal to one-quarter of the first spacing.

[0140] Preferably, in order to increase the detection capability of the edge area of ​​the touch screen, the distance between the center line of the first electrode and the first side on the second axis is less than or equal to half the width of the first electrode, and the distance between the center line of the last electrode and the third side on the second axis is less than or equal to half the width of the first electrode.

[0141] Preferably, in order to increase the detection capability of the edge area of ​​the touch screen, the first electrode and the last electrode are located between the frame and the touch screen.

[0142] Preferably, for ease of design, the width of the first electrode is the same as the width of the second electrode.

[0143] Preferably, in order to conform to the size of the fingertips of an average person, the second spacing is 10mm and the width of the second electrode is 2mm.

[0144] According to an embodiment of this application, a touch processing device is provided for controlling a touch screen as described above, wherein the number of the plurality of second electrodes is N+2, where N is a positive integer greater than 2. The touch processing device includes: a driving circuit for sequentially providing driving signals to the plurality of first electrodes; a sensing circuit including N+1 difference circuits, wherein each difference circuit is used to sense the driving signal sensed by two adjacent second electrodes each time the driving circuit provides the driving signal, so as to obtain a one-dimensional first sensing array with N+1 elements; and a processor module connected to the driving circuit and the sensing circuit for sequentially receiving the plurality of one-dimensional first sensing arrays to form a two-dimensional first sensing array; and detecting external objects approaching or touching the touch screen based on the two-dimensional first sensing array.

[0145] Preferably, in order to avoid electromagnetic interference near the bezel, the processor module is further configured to: remove the first array element and the last array element of the received plurality of one-dimensional first arrays respectively to obtain a plurality of one-dimensional second sensing arrays; form a two-dimensional second sensing array based on the plurality of one-dimensional second sensing arrays; and detect external objects approaching or touching the touch screen based on the two-dimensional second sensing array.

[0146] Preferably, in order to detect a floating or touching external object that enters the touch screen from the bezel, when in the first mode, the touch processing device is further used to report the external object detected by the two-dimensional first sensing array to the host, wherein the first mode is used to detect a floating or touching external object that enters the touch screen from the bezel.

[0147] Preferably, in order to detect floating or contacting external objects in the non-edge area of ​​the touch screen or to increase the accuracy of detecting floating or contacting positions, when in the second mode, the touch processing device is further used to report the external objects detected by the two-dimensional second sensing array to the host, wherein the second mode is used to detect floating or contacting external objects in the non-edge area of ​​the touch screen.

[0148] Preferably, in order to accommodate the fact that the edge area of ​​the touch screen is more susceptible to electromagnetic interference, the gain values ​​of the operational amplifiers of the first and last difference circuits in the N+1 difference circuits are different from the gain values ​​of the operational amplifiers of the remaining N-1 difference circuits.

[0149] According to an embodiment of this application, a touch processing method is provided for controlling a touch screen as described above, wherein the number of the plurality of second electrodes is N+2, where N is a positive integer greater than 2, and the touch processing method includes: sequentially providing driving signals to the plurality of first electrodes; each time the driving signal is provided, using each of the N+1 differential circuits to sense the driving signal sensed by two adjacent second electrodes, so as to obtain a one-dimensional first sensing array with N+1 elements; sequentially receiving the plurality of one-dimensional first sensing arrays to form a two-dimensional first sensing array; and detecting external objects approaching or touching the touch screen based on the two-dimensional first sensing array.

[0150] Preferably, to avoid electromagnetic interference near the frame, the method further includes: removing the first and last array elements of the received plurality of one-dimensional first arrays to obtain a plurality of one-dimensional second sensing arrays; forming a two-dimensional second sensing array based on the plurality of one-dimensional second sensing arrays; and detecting external objects approaching or touching the touch screen based on the two-dimensional second sensing array.

[0151] Preferably, in order to detect a floating or touching external object that enters the touch screen from the bezel, the method further includes: when in a first mode, reporting the external object detected by the two-dimensional first sensing array to the host, wherein the first mode is used to detect a floating or touching external object that enters the touch screen from the bezel.

[0152] Preferably, in order to detect floating or contacted external objects in the non-edge area of ​​the touch screen or to increase the accuracy of detecting floating or contacted positions, the method further includes: when in the second mode, reporting the external objects detected by the two-dimensional second sensing array to the host, wherein the second mode is used to detect floating or contacted external objects in the non-edge area of ​​the touch screen.

[0153] Preferably, in order to accommodate the fact that the edge area of ​​the touch screen is more susceptible to electromagnetic interference, the gain values ​​of the operational amplifiers of the first and last difference circuits in the N+1 difference circuits are different from the gain values ​​of the operational amplifiers of the remaining N-1 difference circuits.

[0154] According to an embodiment of this application, a touch system is provided, including the aforementioned touch processing device and touch screen.

[0155] According to an embodiment of this application, a touch system is provided, including the aforementioned touch processing device, touch screen, and host.

[0156] This application proposes an improved design for the edge touch electrodes of a touch screen, which can reduce detection errors of the edge area for floating or contacting objects. This application also proposes a touch processing device and method for a touch screen, utilizing differential circuitry to reduce the influence of electromagnetic interference on the edge area of ​​the touch screen.

[0157] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, the modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A touch processing device for controlling a touch screen, wherein the touch screen comprises: a display screen; a plurality of first electrodes parallel to a first axis and a plurality of second electrodes parallel to a second axis overlapping the display screen; and an opaque and non-conductive frame surrounding the display screen and superimposed on the display screen, wherein the first axis is perpendicular to the second axis, the plurality of first electrodes and the plurality of second electrodes overlap each other, the center lines of any two of the plurality of second electrodes are separated by a second distance, the distance between the center line of the first second electrode and the second side of the frame parallel to the second axis on the first axis is less than or equal to one-quarter of the second distance, the distance between the center line of the last second electrode and the fourth side of the frame parallel to the second axis on the first axis is less than or equal to one-quarter of the second distance, and the number of the plurality of second electrodes is N+2, where N is a positive integer greater than 2, characterized in that... The touch processing device includes: A driving circuit is used to provide driving signals to the plurality of first electrodes in turn; The sensing circuit includes N+1 difference circuits, wherein each difference circuit is used to sense the driving signal sensed by the two adjacent second electrodes each time the driving circuit provides the driving signal, so as to obtain a one-dimensional first sensing array with N+1 elements. as well as The processor module connected to the drive circuit and the sensing circuit is used for: Multiple one-dimensional first sensing arrays are received in turn to form a two-dimensional first sensing array; as well as Based on the two-dimensional first sensing array, external objects that approach or come into contact with the touch screen are detected.

2. The touch processing device according to claim 1, characterized in that, This processor module is more often used for: The first and last array elements of the multiple received one-dimensional first arrays are removed to obtain multiple one-dimensional second sensing arrays. Based on the multiple one-dimensional second sensing arrays, a two-dimensional second sensing array is formed; as well as Based on the two-dimensional second sensing array, external objects that approach or come into contact with the touch screen are detected.

3. The touch processing device according to claim 1, characterized in that, When in the first mode, the touch processing device is further used to report external objects detected by the two-dimensional first sensing array to the host, wherein the first mode is used to detect external objects that are suspended or in contact with the touch screen and enter from the edge.

4. The touch processing device according to claim 2, characterized in that, When in the second mode, the touch processing device is further used to report external objects detected by the two-dimensional second sensing array to the host, wherein the second mode is used to detect external objects that are suspended or in contact with the non-edge area of ​​the touch screen.

5. The touch processing device according to claim 1, characterized in that, The operational amplifier gain values ​​of the first and last difference circuits in the N+1 difference circuits are different from the operational amplifier gain values ​​of the remaining N-1 difference circuits.

6. A touch processing method for controlling a touch screen, wherein the touch screen comprises: a display screen; a plurality of first electrodes parallel to a first axis and a plurality of second electrodes parallel to a second axis overlapping the display screen; and an opaque and non-conductive border surrounding the display screen and superimposed on the display screen, wherein the first axis is perpendicular to the second axis, the plurality of first electrodes and the plurality of second electrodes overlap each other, the center lines of any two of the plurality of second electrodes are separated by a second distance, the distance between the center line of the first second electrode and the second side of the border parallel to the second axis on the first axis is less than or equal to one-quarter of the second distance, the distance between the center line of the last second electrode and the fourth side of the border parallel to the second axis on the first axis is less than or equal to one-quarter of the second distance, and the number of the plurality of second electrodes is N+2, where N is a positive integer greater than 2, characterized in that... The touch processing method includes: Drive signals are provided to the multiple first electrodes in turn; Each time the drive signal is provided, each of the N+1 differential circuits is used to sense the drive signal sensed by the two adjacent second electrodes, so as to obtain a one-dimensional first sensing array with N+1 elements. Multiple one-dimensional first sensing arrays are received in turn to form a two-dimensional first sensing array; as well as Based on the two-dimensional first sensing array, external objects that approach or come into contact with the touch screen are detected.

7. The touch processing method according to claim 6, characterized in that, It also includes: The first and last array elements of the multiple received one-dimensional first arrays are removed to obtain multiple one-dimensional second sensing arrays. Based on the multiple one-dimensional second sensing arrays, a two-dimensional second sensing array is formed; as well as Based on the two-dimensional second sensing array, external objects that approach or come into contact with the touch screen are detected.

8. The touch processing method according to claim 6, characterized in that, It further includes: when in the first mode, reporting the external objects detected by the two-dimensional first sensing array to the host, wherein the first mode is used to detect external objects that are suspended or touched by entering the touch screen from the edge.

9. The touch processing method according to claim 7, characterized in that, It further includes: when in the second mode, reporting the external objects detected by the two-dimensional second sensing array to the host, wherein the second mode is used to detect external objects that are suspended or touched in the non-edge area of ​​the touch screen.

10. The touch processing method according to claim 6, characterized in that, The operational amplifier gain values ​​of the first and last difference circuits in the N+1 difference circuits are different from the operational amplifier gain values ​​of the remaining N-1 difference circuits.

11. A touch system, characterized in that, It includes a touch processing device and a touch screen as described in any one of claims 1 to 5.

12. A touch system, characterized in that, It includes a touch processing device, a host computer, and a touch screen as described in any one of claims 3 to 4.

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