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WO2018176197A1 - Procédé et dispositif d'élimination de brouillage lcd d'un écran de commande tactile - Google Patents

Procédé et dispositif d'élimination de brouillage lcd d'un écran de commande tactile Download PDF

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Publication number
WO2018176197A1
WO2018176197A1 PCT/CN2017/078297 CN2017078297W WO2018176197A1 WO 2018176197 A1 WO2018176197 A1 WO 2018176197A1 CN 2017078297 W CN2017078297 W CN 2017078297W WO 2018176197 A1 WO2018176197 A1 WO 2018176197A1
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WIPO (PCT)
Prior art keywords
value
lcd
sensing line
demodulated signal
interference
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Application number
PCT/CN2017/078297
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English (en)
Chinese (zh)
Inventor
杨烊
方军
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深圳市汇顶科技股份有限公司
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Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to CN201780000178.8A priority Critical patent/CN109219792B/zh
Priority to PCT/CN2017/078297 priority patent/WO2018176197A1/fr
Publication of WO2018176197A1 publication Critical patent/WO2018176197A1/fr

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means

Definitions

  • the present application relates to the field of noise interference cancellation technologies, and in particular, to a method and apparatus for eliminating interference from a touch screen LCD.
  • Noise interference directly affects the user experience in consumer electronic devices, so noise immunity is an important performance indicator for measuring consumer electronics.
  • the interference received by terminal equipment mobile phones, PADs, etc.
  • the interference received by terminal equipment mainly comes from the wireless communication system, LCD screen and charger that the device comes with. Since the interaction mode between the human and the terminal device is generally inseparable from the touch screen, the LCD interference from the touch screen will seriously affect the user's interactive experience. Therefore, the ability to improve the resistance to LCD interference has become an important research direction of touch-based interactive products.
  • one of the technical problems solved by the embodiments of the present application is to provide a method and device for eliminating interference of a touch screen LCD, which is used to eliminate LCD interference of the touch screen.
  • the embodiment of the present application provides a method for eliminating interference of a touch screen LCD, wherein the touch screen has a driving line and a sensing line, and the method includes:
  • the embodiment of the present application further provides a device for eliminating interference of a touch screen LCD, wherein the touch screen has a driving line and a sensing line, and the device includes:
  • a first difference calculation module configured to perform differential calculation between a demodulated signal value on the sensing line of the non-touch position where LCD interference exists and a reference demodulated signal value that is not interfered by the LCD on the sensing line, to obtain a first a differential value
  • a second difference calculation module configured to perform a differential calculation between the demodulated signal value on the sensing line of the non-touch position of the current frame and the first difference value to obtain a second difference value
  • the original data calculation module is configured to perform operation according to the second differential value to obtain raw data of the capacitor node that eliminates LCD interference.
  • the present application directly calculates the difference between the demodulated signal value on the sensing line of the non-touch position where the LCD interference exists and the reference demodulated signal value that is not interfered by the LCD on the sensing line, A first differential value representative of LCD interference noise is obtained. And performing differential calculation on the sensing signal value on the sensing line of the non-touch position of the current frame and the first differential value to obtain a second differential value, that is, a demodulated signal on the current frame sensing line that eliminates LCD interference noise. value.
  • the demodulated signal value on the sensing line for eliminating the LCD interference noise is used to perform calculation, and the raw data of the capacitor node for eliminating the LCD interference is obtained. Therefore, the application eliminates the LCD interference of the touch screen and improves the subsequent digital computing performance, and the application on the touch screen chip can greatly improve the anti-LCD interference capability of the device.
  • 1 is a schematic diagram of a touch screen driving line superimposed noise signal
  • FIG. 2 is a flow chart of an example of a method for eliminating interference of a touch screen LCD according to the present application
  • step S3 is a flow chart of an example of step S3 in the method for eliminating interference of a touch screen LCD according to the present application
  • FIG. 4 is a structural diagram of an example of an apparatus for eliminating interference of a touch screen LCD according to the present application
  • FIG. 5 is a structural diagram of an example of a raw data calculation module in an apparatus for eliminating interference of a touch screen LCD according to the present application
  • FIG. 6 is a hardware structural diagram of an electronic device applied to a method for eliminating interference of a touch screen LCD according to the present application.
  • the driving signal of the LCD is easily coupled to the touch layer, which interferes with the normal operation of the touch chip.
  • the form of LCD interference response at the data level is Many, the most common one is to superimpose a fixed value on the entire drive line, as shown in Figure 1 (the vertical direction of the figure 1-16 represents the drive line, the horizontal number 1-10 represents the induction channel).
  • the characteristic data of the LCD interference is as follows: 1.
  • the noise interference of the single sensing drive channel at the same time does not change much, and can be considered the same. 2.
  • the basic process of acquiring data on the touch screen is as follows: simultaneous or group coding on the m driving lines (usually using a sine wave as a coding signal) And a coded signal is coupled to the sensing line on the drive line.
  • simultaneous or group coding on the m driving lines usually using a sine wave as a coding signal
  • a coded signal is coupled to the sensing line on the drive line.
  • A is a coding matrix
  • C is a matrix of capacitance nodes to be obtained (including phase information)
  • B is a value of a demodulated signal on the sensing line.
  • the modulation and demodulation process of the signal on the inductive line is as follows:
  • the interference data characteristic of the LCD since the LCD interference on the same driving line is the same at the same time, the data that has not been subjected to the LCD interference can be used as the reference data, and the currently acquired capacitance node data matrix, that is, the C matrix ( The raw data, Rawdata) subtracts the reference matrix to obtain a matrix representing the LCD interference noise.
  • S is a coded signal and N is a noise signal.
  • the capacitor node matrix performs processing for eliminating LCD interference, and obtains the raw data of the capacitor node matrix to eliminate LCD interference:
  • the matrix of capacitance nodes is subtracted from the matrix of capacitive nodes (ie, reference signals) that are not subject to noise interference.
  • the diff obtained after the differential processing is not a simple noise interference component, but also a mixture with the coding signal, because the nonlinear operation is performed when the original data of the capacitance node matrix is acquired, resulting in signal and noise. The amount of mixing appears.
  • the present application directly determines the demodulated signal value on the sensing line of the non-touch position where there is LCD interference and the reference demodulated signal that is not interfered by the LCD on the sensing line.
  • the values are differentially calculated to obtain a first difference value representative of the LCD interference noise.
  • the demodulated signal value on the sensing line for eliminating the LCD interference noise is used to perform calculation, and the raw data of the capacitor node for eliminating the LCD interference is obtained. Therefore, the application eliminates the LCD interference of the touch screen and improves the subsequent digital computing performance, and the application on the touch screen chip can greatly improve the anti-LCD interference capability of the device.
  • the touch input device of the present application may illustratively be a stylus, and other input devices and/or pointing devices may be used in various embodiments of the present application.
  • the present application provides a method for eliminating interference from a touch screen LCD having a driving line and a sensing line.
  • the method includes:
  • S1 Perform differential calculation between the demodulated signal value on the sensing line of the non-touch position where LCD interference exists and the reference demodulated signal value that is not interfered by the LCD on the sensing line to obtain a first difference value.
  • the demodulated signal value on the sensing line includes noise data.
  • the interference of the LCD noise on the same driving line Tx at the same time is the same. Therefore, the present application obtains the matrix of the demodulated signal value of the LCD interference at the same time on the sensing line minus the time of the sensing line.
  • the matrix N in the formula (10) represents a noise matrix
  • the matrix B+N represents a matrix of demodulated signal values in which LCD interference exists
  • the matrix B represents a matrix of demodulated signal values not subjected to LCD interference.
  • the present application directly performs differential processing on the demodulated signal value on the sensing line including noise interference and the demodulated signal value on the sensing line that is not interfered, that is, directly obtains a noise signal in the B matrix ( First difference value).
  • step S1 further includes:
  • the first difference value is averaged to obtain an average first difference value.
  • each row of the first difference value matrix is averaged to obtain an average first difference value matrix.
  • the matrix N in the formula (11) represents a noise matrix.
  • the present application performs an average calculation on each row of the first difference value matrix to obtain an average noise condition, thereby eliminating noise errors generated during calculation and signal processing.
  • the reference demodulation signal value on the sensing line that is not interfered by the LCD may be a pre-stored reference demodulated signal value on the sensing line that is not interfered by the LCD, or the sensing line is detected.
  • the reference demodulated signal value on the sensing line that is not subjected to LCD interference may be a pre-stored reference demodulated signal value on the sensing line that is not interfered by the LCD, or the sensing line is detected.
  • the pre-stored reference demodulated signal value on the sensing line that is not subjected to LCD interference can be obtained by testing when the LCD screen is not attached before leaving the factory.
  • step S1 is specifically:
  • the demodulated signal value on the sensing line of the non-touch position where there is LCD interference is differentially calculated from the reference demodulated signal value on the sensing line that is not interfered by the LCD at the current moment, to obtain the first difference. value.
  • the reference demodulated signal value on the sensing line that is not subjected to LCD interference is acquired at a previous moment of the demodulated signal value on the sensing line of the non-touch position where LCD interference exists, so Calculating the first difference value can more accurately reflect the noise condition on the same driving line Tx at the same time.
  • step S1 is specifically:
  • the difference between the demodulated signal value on the partial sensing line and the reference demodulated signal value on the sensing line that is not interfered by the LCD is used to obtain a first difference value, which can reduce the amount of calculation for performing the difference calculation.
  • the demodulated signal value on the sensing line of the current frame is differentially calculated from the first difference value to obtain a second difference value.
  • step S2 is specifically:
  • the demodulated signal value on the sensing line of the current frame is differentially calculated from the average first difference value to obtain a second difference value.
  • the matrix D in the formula (12) represents a matrix of demodulated signal values on the sensing line of the current frame from which the noise signal is removed
  • the matrix B+N represents the value of the demodulated signal on the sensing line of the current frame containing the noise
  • the matrix N/n represents the average first difference value.
  • the step S3 includes:
  • the step S31 is specifically:
  • the signal components of the I and Q paths of the capacitance node matrix are obtained by using the second difference value matrix and the coding matrix.
  • the I and Q paths of the capacitor node matrix C can be obtained by using the coding matrix A and the demodulated signal value matrix B on the sensing line. Signal component.
  • the step S32 is specifically:
  • the non-linear operation is performed by using the signal components of the I and Q channels to obtain the raw data of the capacitance node matrix to eliminate LCD interference.
  • the present invention directly calculates the difference between the demodulated signal value on the sensing line of the non-touch position where the LCD interference exists at one moment and the reference demodulated signal value that is not interfered by the LCD at the previous moment on the sensing line. Obtain a first differential value representative of LCD interference noise. And performing differential calculation on the sensing line according to the current frame and the first differential value to obtain a second differential value, that is, a demodulated signal value on the current frame sensing line that eliminates LCD interference noise. Thereby, the demodulated signal value on the sensing line for eliminating the LCD interference noise is used to perform calculation, and the raw data of the capacitor node for eliminating the LCD interference is obtained. Therefore, the application eliminates the LCD interference of the touch screen and improves the subsequent digital computing performance, and the application on the touch screen chip can greatly improve the anti-LCD interference capability of the device.
  • the application also provides a device for eliminating interference from a touch screen LCD, the touch screen having a driving line and a sensing line.
  • the apparatus includes:
  • the first difference calculation module 41 is configured to perform differential calculation between the demodulated signal value on the sensing line of the non-touch position where LCD interference exists and the reference demodulated signal value that is not interfered by the LCD on the sensing line, to obtain The first difference value.
  • the second difference calculation module 42 is configured to perform a difference calculation between the demodulated signal value on the sensing line of the non-touch position of the current frame and the first difference value to obtain a second difference value.
  • the original data calculation module 43 is configured to perform operation according to the second differential value to obtain raw data of the capacitor node that eliminates LCD interference.
  • the demodulated signal value on the sensing line includes noise data.
  • the interference of the LCD noise on the same driving line Tx at the same time is the same. Therefore, the present application obtains the demodulated signal value matrix of the LCD interference at the same time on the sensing line minus the reference demodulated signal value that is not interfered by the LCD. Matrix, thereby obtaining a noise matrix N.
  • the matrix N in the formula (10) represents a noise matrix
  • the matrix B+N represents a matrix of demodulated signal values in which LCD interference exists
  • the matrix B represents a matrix of demodulated signal values not subjected to LCD interference.
  • the present application directly performs differential processing on the demodulated signal value on the sensing line including noise interference and the demodulated signal value on the sensing line that is not interfered, that is, directly obtains a noise signal in the B matrix ( First difference value).
  • the first difference calculation module 41 is further configured to perform an average calculation on the first difference value to obtain an average first difference value.
  • each row of the first difference value matrix is averaged to obtain an average first difference value matrix.
  • the matrix N in the formula (11) represents a noise matrix.
  • the present application performs an average calculation on each row of the first difference value matrix to obtain an average noise condition, thereby eliminating noise errors generated during calculation and signal processing.
  • the reference demodulation signal value on the sensing line that is not interfered by the LCD may be a pre-stored reference demodulated signal value on the sensing line that is not interfered by the LCD, or the sensing line is detected.
  • the reference demodulated signal value on the sensing line that is not subjected to LCD interference may be a pre-stored reference demodulated signal value on the sensing line that is not interfered by the LCD, or the sensing line is detected.
  • the pre-stored reference demodulated signal value on the sensing line that is not subjected to LCD interference can be obtained by testing when the LCD screen is not attached before leaving the factory.
  • the first differential calculation module is specifically configured to: the demodulated signal value on the sensing line of the non-touch position where the LCD interference exists is not interfered by the LCD at a previous moment of the current time.
  • the reference demodulated signal value on the sensing line is differentially calculated to obtain a first difference value.
  • the reference demodulated signal value on the sensing line that is not affected by the LCD is acquired at a previous moment of the demodulated signal value on the sensing line of the non-touch position where the LCD interference exists.
  • the first difference value obtained by the differential calculation can more accurately reflect the noise condition on the same driving line Tx at the same time.
  • the first differential calculation module is specifically configured to use a demodulated signal value of all or part of the sensing lines of the touch screen that has a non-touch position with LCD interference. Performing differential calculation on the reference demodulated signal value that is not interfered by the LCD on the sensing line to obtain a first difference value.
  • the difference between the demodulated signal value on the partial sensing line and the reference demodulated signal value on the sensing line that is not interfered by the LCD is used to obtain a first difference value, which can reduce the amount of calculation for performing the difference calculation.
  • the second difference calculation module 42 is specifically configured to specifically:
  • the demodulated signal value on the sensing line of the current frame is differentially calculated from the average first difference value to obtain a second difference value.
  • the matrix D in the formula (12) represents a matrix of demodulated signal values on the sensing line of the current frame from which the noise signal is removed
  • the matrix B+N represents the value of the demodulated signal on the sensing line of the current frame containing the noise
  • the matrix N/n represents the average first difference value.
  • the original data calculation module 43 includes:
  • the IQ component obtaining unit 431 is configured to perform an operation according to the second differential value to obtain signal components of the capacitive node I and Q paths.
  • the IQ component calculation unit 432 is configured to obtain the original data of the capacitance node to eliminate LCD interference by using the signal components of the I and Q paths.
  • the IQ component obtaining unit 431 is specifically configured to obtain the signal components of the I and Q paths of the capacitor node matrix by using the second difference value matrix and the coding matrix.
  • the I and Q paths of the capacitor node matrix C can be obtained by using the coding matrix A and the demodulated signal value matrix B on the sensing line. Signal component.
  • the IQ component calculation unit 432 is specifically configured to perform nonlinear operations by using signal components of the I and Q channels to obtain original data of the capacitance node matrix to eliminate LCD interference.
  • the present invention directly calculates the difference between the demodulated signal value on the sensing line of the non-touch position where the LCD interference exists at one moment and the reference demodulated signal value that is not interfered by the LCD at the previous moment on the sensing line. Obtain a first differential value representative of LCD interference noise. And performing differential calculation on the sensing line according to the current frame and the first differential value to obtain a second differential value, that is, a demodulated signal value on the current frame sensing line that eliminates LCD interference noise. Thereby, the demodulated signal value on the sensing line for eliminating the LCD interference noise is used to perform calculation, and the raw data of the capacitor node for eliminating the LCD interference is obtained. Therefore, the application eliminates the LCD interference of the touch screen and improves the subsequent digital computing performance, and the application on the touch screen chip can greatly improve the anti-LCD interference capability of the device.
  • FIG. 6 is a schematic diagram showing the hardware structure of an electronic device for eliminating interference from a touch screen LCD according to the present application. According to Figure 6, the device comprises:
  • processors 610 and memory 620 one processor 610 is taken as an example in FIG.
  • the device for eliminating touch screen LCD interference may further include: an input device 630 and an output device 630.
  • the processor 610, the memory 620, the input device 630, and the output device 630 may be connected by a bus or other means, as exemplified by a bus connection in FIG.
  • the memory 620 is a non-volatile computer readable storage medium, and can be used for storing a non-volatile software program, a non-volatile computer-executable program, and a module, such as a program corresponding to the method for searching for a topic in the embodiment of the present application.
  • An instruction/module for example, the first difference calculation module 41, the second difference calculation module 42, and the raw data calculation module 43 shown in FIG. 4).
  • the processor 610 performs various functional applications and data processing of the server by running non-volatile software programs, instructions, and modules stored in the memory 620, that is, a method for eliminating the interference of the touch screen LCD by the above method embodiments.
  • the memory 620 can include a storage program area and a storage data area, wherein the storage program area can store an operating system, an application required for at least one function; and the storage data area can be stored according to the use of the device for eliminating touch screen LCD interference. Data, etc.
  • memory 620 can include high speed random access memory 620, and can also include non-volatile memory 620, such as at least one disk storage device 620, flash memory device, or other non-volatile solid state memory 620 device.
  • the memory 620 can optionally include a memory 620 remotely located relative to the processor 610, which can be connected to the sound mode selection device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
  • Input device 630 can receive input numeric or character information and generate key signal inputs related to user settings and function control of the device for topic search.
  • Output device 630 can include a device such as a speaker.
  • the one or more modules are stored in the memory 620, and when executed by the one or more processors 610, perform the method of canceling touch screen LCD interference in any of the above method embodiments.
  • the electronic device of the embodiment of the present application exists in various forms, including but not limited to:
  • Mobile communication devices These devices are characterized by mobile communication functions and are mainly aimed at providing voice and data communication.
  • Such terminals include: smart phones (such as iPhone), multimedia phones, functional phones, and low-end phones.
  • Ultra-mobile personal computer equipment This type of equipment belongs to the category of personal computers, has computing and processing functions, and generally has mobile Internet access.
  • Such terminals include: PDAs, MIDs, and UMPC devices, such as the iPad.
  • Portable entertainment devices These devices can display and play multimedia content. Such devices include: audio, video players (such as iPod), handheld game consoles, e-books, and smart toys and portable car navigation devices.
  • the server consists of a processor, a hard disk, a memory, a system bus, etc.
  • the server is similar to a general-purpose computer architecture, but because of the need to provide highly reliable services, processing power and stability High reliability in terms of reliability, security, scalability, and manageability.
  • embodiments of the embodiments of the present application can be provided as a method, apparatus (device), or computer program product. Therefore, the embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Moreover, embodiments of the present application may employ a computer usable memory in one or more of the computer usable program code.
  • a form of computer program product embodied on a storage medium including but not limited to disk storage, CD-ROM, optical storage, and the like.
  • Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus, and computer program products according to embodiments of the present application. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG.
  • These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

L'invention concerne un procédé et un dispositif d'élimination de brouillage LCD d'un écran de commande tactile, l'écran de commande tactile possédant une ligne d'attaque et une ligne de détection. Le procédé consiste : à effectuer un calcul différentiel sur une valeur de signal de démodulation avec brouillage LCD sur une ligne de détection à une position de commande non tactile et sur une valeur de signal de démodulation de référence sans brouillage LCD sur la ligne de détection de façon à obtenir une première valeur différentielle (S1) ; à effectuer un calcul différentiel sur une valeur de signal de démodulation sur la ligne de détection à la position de commande non tactile d'une trame en cours et sur la première valeur différentielle de façon à obtenir une seconde valeur différentielle (S2) ; et à effectuer une opération en fonction de la seconde valeur différentielle de façon à obtenir des données d'origine d'un nœud de condensateur au niveau duquel le brouillage LCD est éliminé (S3) de façon à éliminer le brouillage LCD d'un écran de commande tactile.
PCT/CN2017/078297 2017-03-27 2017-03-27 Procédé et dispositif d'élimination de brouillage lcd d'un écran de commande tactile WO2018176197A1 (fr)

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CN201780000178.8A CN109219792B (zh) 2017-03-27 2017-03-27 一种消除触控屏lcd干扰的方法及装置
PCT/CN2017/078297 WO2018176197A1 (fr) 2017-03-27 2017-03-27 Procédé et dispositif d'élimination de brouillage lcd d'un écran de commande tactile

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CN102968230A (zh) * 2012-11-07 2013-03-13 江苏美琪威电子科技有限公司 一种消除电容式触摸屏噪声的方法及电容式触摸屏

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EP3667477A4 (fr) * 2018-10-31 2020-08-26 Shenzhen Goodix Technology Co., Ltd. Procédé de réduction de bruit, dispositif d'affichage tactile et support de stockage lisible par ordinateur
US10963099B2 (en) 2018-10-31 2021-03-30 Shenzhen Goodix Technology Co., Ltd Noise reduction method, touch display apparatus, and computer-readable storage medium

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