WO2017143823A1 - Procédé et dispositif permettant d'assurer une résistance aux interférences électromagnétiques d'un écran tactile capacitif - Google Patents

Procédé et dispositif permettant d'assurer une résistance aux interférences électromagnétiques d'un écran tactile capacitif Download PDF

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Publication number
WO2017143823A1
WO2017143823A1 PCT/CN2016/107737 CN2016107737W WO2017143823A1 WO 2017143823 A1 WO2017143823 A1 WO 2017143823A1 CN 2016107737 W CN2016107737 W CN 2016107737W WO 2017143823 A1 WO2017143823 A1 WO 2017143823A1
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Prior art keywords
capacitive screen
preset
sensing
sensing area
shape
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PCT/CN2016/107737
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English (en)
Chinese (zh)
Inventor
王双军
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上海斐讯数据通信技术有限公司
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Publication of WO2017143823A1 publication Critical patent/WO2017143823A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G06F3/04186—Touch location disambiguation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR 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 invention relates to the field of electrical appliances, and in particular to a method and a device for resisting electromagnetic interference of a capacitive screen.
  • Capacitive touch screen technology uses the current sensing of the human body to work.
  • the most common means of resisting electromagnetic interference is to change the firmware of the capacitive screen to enhance the anti-interference ability matched with different interference sources.
  • the interference of the display screen, the interference of the mobile phone antenna, the high current interference during charging, etc. will affect the capacitive screen to varying degrees.
  • the firmware of the touch screen enhances the anti-jamming capability of this aspect.
  • the enhanced anti-interference ability is not as strong as possible, and the anti-interference ability is enhanced, and the sensitivity of the touch may be lowered. This is also the biggest headache for mobile phone R&D engineers. It must be effective and not easily disturbed.
  • the technical problem to be solved by the present invention is to provide a method and apparatus for resisting electromagnetic interference of a capacitive screen capable of reducing electromagnetic interference.
  • the present invention provides a method for resisting electromagnetic interference of a capacitive screen, comprising the steps of:
  • the capacitive touch screen sensing area data is reported; if it is not, the report is not reported.
  • the step of determining whether the shape of the capacitive screen sensing area conforms to a preset regular shape comprises:
  • Determining whether the difference between the shape of the capacitive screen sensing area and the preset regular shape meets a preset threshold If yes, determining that the shape of the capacitive screen sensing area conforms to a preset regular shape.
  • the setting is The concept of the difference value may be considered as conforming to the preset rule shape if the difference value does not exceed the preset threshold. If the preset threshold is exceeded, the shape of the capacitive screen sensing area is not in accordance with the preset rule shape. No need to report.
  • the preset rule shape includes at least a preset elliptical shape and a preset circular shape.
  • the touch input is controlled by finger touch, and is generally triggered by the finger finger, which also means that if the capacitive touch area is controlled by a finger,
  • the shape is basically independent of the elliptical and round-like shapes. In addition, it can be considered as non-human control input.
  • the step of determining whether the shape of the capacitive screen sensing area conforms to a preset regular shape comprises:
  • a horizontal axis tangent line and a vertical axis tangent line are respectively performed on the capacitive screen sensing area, and it is determined whether the number of the capacitive channels spanned by the horizontal axis tangent line and the number axis tangent line meets a preset number. If yes, the difference value is determined to be less than or equal to the threshold value.
  • the horizontal axis and the numerical axis generally refer to the lateral position of the capacitive screen sensing area in the lateral direction and the vertical direction, and the horizontal axis tangent line and the vertical axis tangent line are crisscrossed.
  • the tangent line may be regarded as not the horizontal axis tangent line or the vertical axis. Tangent, no further steps are carried out; the size and size of our human fingers, especially the fingertips commonly used for touch input, are limited. Correspondingly, the number of capacitive channels that can be crossed is also limited.
  • the step of determining whether the shape of the capacitive screen sensing area conforms to a preset regular shape comprises:
  • the shape of the capacitive sensing area conforms to a preset regular shape.
  • the capacitive touch screen multi-finger touch will cause the change of the capacitance therein, in fact, in time, the direct contact with the touch, the other body parts close to the capacitive screen may still cause the change of the capacitance therein, thereby affecting the judgment result.
  • the contact capacitance is not directly touched, the value of the induced capacitance should be relatively low.
  • the shape of the sensing area of the capacitive screen can be judged to improve the accuracy.
  • many weak electromagnetic interferences are caused. Most of the changes in capacitance are intended to be relatively small. Eliminating this part of the data can also reduce the impact of electromagnetic interference.
  • the method further includes the following steps:
  • the central capacitance sensing amount of the capacitive screen sensing area meets the preset sensing quantity threshold, and if yes, reporting the coordinate point.
  • the central capacitance induction caused by the finger touch input is weak, it is much larger than most electromagnetic interference, and the data far lower than the normal center capacitance induction can be eliminated, which can reduce the influence of electromagnetic interference. Similarly, It is also possible to reject data that is much higher than the normal center capacitance.
  • the step of detecting whether the central capacitance sensing amount of the capacitive screen sensing area meets a preset sensing amount threshold comprises:
  • the central capacitive sensing quantity generally refers to the coordinate point where the value of the sensing capacitance in the sensing area of the capacitive screen is the largest, or the value of the sensing capacitance of the center point of the area of the sensing area of the entire capacitive screen.
  • the step of detecting whether the central capacitance sensing amount of the capacitive screen sensing area meets a preset sensing amount threshold comprises:
  • the plurality of coordinate points should be adjacent to each other, which is in line with reality, if the coordinate points of the plurality of large sensing capacitance values existing in the sensing area of the capacitive screen are in the north and the sensing capacitance values of the coordinate points existing between each other Far below them, it can be basically determined that the capacitive sensing area is not a human touch input; using this scheme can improve the anti-electromagnetic interference capability.
  • the touch input due to the touch area of the finger, will cause a considerable number of sensing capacitance values to exceed the preset sensing threshold. If there is no threshold value in the capacitive screen. The coordinate point exists, or the number is too small, then it can be basically determined that the capacitive screen sensing area is not artificial input, and should not It should be reported.
  • the capacitive screen sensing area is a continuous area on the capacitive screen that detects a change in capacitance. If two or more capacitive screen sensing areas are detected at the same time, the sensing areas of the respective capacitive screens are respectively determined. Whether the shape conforms to the preset rule shape. Obtaining, judging and analyzing the upload separately can avoid the occurrence of errors to a certain extent and help to reduce electromagnetic interference.
  • An apparatus for resisting electromagnetic interference using any of the methods of the present invention comprising:
  • a mobile terminal processor for managing and controlling processing and interaction of data of the mobile terminal
  • a capacitive screen chip for acquiring capacitive screen sensing area data
  • a judging module configured to determine whether a shape of the capacitive screen sensing area conforms to a preset regular shape
  • the determining module controls the capacitive screen chip to report the capacitive screen sensing area data to the mobile terminal processor; if not, the reporting is not performed.
  • the method of the present invention adds a mechanism for judging whether the shape of the capacitive screen sensing area conforms to a preset regular shape, which enables the mobile terminal to filter the capacitive screen sensing area data before uploading the capacitive screen sensing area data.
  • the sensing area of the screen is triggered by the finger, and the shape of the obtained capacitive screen sensing area can be expected to be a predetermined regular shape like an ellipse or a circle, and this part is reported by the capacitive screen IC. Reported to the mobile phone processor for processing; and for other situations, for example, if the capacitive screen receives electromagnetic interference, the shape of the capacitive screen sensing area formed by the electromagnetic interference is likely not to be a preset rule shape.
  • the capacitive screen When the capacitive screen is designed for anti-interference, it can reduce the appearance of changing the firmware of the capacitive screen, thereby ensuring the sensitivity of the capacitive screen, improving the anti-interference ability of the capacitive screen and improving the touch sensitivity of the capacitive screen.
  • FIG. 1 is a flow chart of a method for resisting electromagnetic interference of a capacitive screen according to an embodiment of the invention.
  • FIG. 2 is a schematic diagram of capacitance values of a capacitive screen without touch input according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram showing capacitance values of a finger touch input of a capacitive screen according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram showing capacitance values of a capacitive screen according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a device for resisting electromagnetic interference of a capacitive screen according to Embodiment 2 of the present invention.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • FIG. 1 is a flow chart of a method for resisting electromagnetic interference of a capacitive screen according to an embodiment of the invention, the method comprising the steps of:
  • the method of the present invention adds a mechanism for judging whether the shape of the capacitive screen sensing area conforms to a preset regular shape, which enables the mobile terminal to filter the capacitive screen sensing area data before uploading the capacitive screen sensing area data.
  • the sensing area of the screen is triggered by the finger, so the shape of the obtained capacitive screen sensing area can be expected to be a class A predetermined regular shape, such as an ellipse or a circle-like shape, is reported to the mobile phone processor for processing by the capacitive screen IC; and for other cases, for example, if the capacitive screen receives electromagnetic interference, Then, the shape of the capacitive screen sensing area formed by the electromagnetic interference may not be the preset regular shape.
  • the capacitive screen may be reduced due to electromagnetic interference, and Due to this mechanism, when the capacitive screen is designed for anti-interference, the situation of changing the firmware of the capacitive screen can be reduced, thereby ensuring the sensitivity of the capacitive screen, thereby improving the anti-interference ability of the capacitive screen and improving the touch sensitivity of the capacitive screen. .
  • the types of electromagnetic interference include LCD interference, mobile phone antenna interference, large current interference during charging, or external electromagnetic interference. If you change the firmware to enhance the anti-interference ability for each different interference source, you can not only take into account And it will seriously affect the touch sensitivity, and without using the method of the present invention, such a problem does not occur.
  • the step of determining whether the shape of the capacitive screen sensing area conforms to the preset regular shape comprises:
  • the difference between the shape of the capacitive screen sensing area and the preset regular shape meets a preset threshold. If yes, it is determined that the shape of the capacitive screen sensing area conforms to a preset regular shape. Although the shape of the capacitive screen sensing area triggered by the user's mobile phone is mostly regular, it is not an absolutely regular shape. Therefore, in this solution, the concept of the difference value is set, as long as the difference value does not exceed the preset threshold. It can be considered as conforming to the shape of the preset rule. If the preset threshold is exceeded, it indicates that the shape of the capacitive screen sensing area does not conform to the preset rule shape and need not be reported.
  • the preset rule shape includes at least a preset elliptical shape and a preset. Round shape.
  • the touch input is controlled by finger touch, and is generally triggered by the finger finger, which also means that if the capacitive touch area is controlled by a finger,
  • the shape is basically independent of the elliptical and round-like shapes. In addition, it can be considered as non-human control input.
  • the step of determining whether the shape of the capacitive screen sensing area conforms to the preset regular shape comprises:
  • the transverse axis tangent and the vertical axis tangent are respectively performed on the capacitive screen sensing area, and it is determined whether the number of capacitive channels spanned by the horizontal axis tangent line and the number axis tangent line meets a preset number. If yes, the difference value is determined to be less than or equal to the threshold value.
  • the horizontal axis and the numerical axis generally refer to the lateral position of the capacitive screen sensing area in the lateral direction and the vertical direction, and the horizontal axis tangent line and the vertical axis tangent line are crisscrossed.
  • the tangent line may be regarded as not the horizontal axis tangent line or the vertical axis. Tangent, no further steps are carried out; the size and size of our human fingers, especially the fingertips commonly used for touch input, are limited. Correspondingly, the number of capacitive channels that can be crossed is also limited. It is only one or two capacitor channels wide, then it can be assumed that the capacitive screen sensing area is not considered input, because the human finger cannot be so small; similarly, if the number of capacitive channels spanning is too large, it can be considered that the input is not considered There is no need to report, because even if it is not electromagnetic interference, but the body part of the person is triggered, it can only be partially operated by the palm of the hand. It can be judged to be unintentional. If you do not report it, you can reduce the jump point or Misoperation.
  • the step of determining whether the shape of the capacitive screen sensing area conforms to the preset regular shape comprises:
  • the capacitive touch screen multi-finger touch will cause the change of the capacitance therein, in fact, in time, the direct contact with the touch, the other body parts close to the capacitive screen may still cause the change of the capacitance therein, thereby affecting the judgment result.
  • the contact capacitance is not directly touched, the value of the induced capacitance should be relatively low.
  • the shape of the sensing area of the capacitive screen can be judged to improve the accuracy.
  • many weak electromagnetic interferences are caused. Most of the changes in capacitance are intended to be relatively small. Eliminating this part of the data can also reduce the impact of electromagnetic interference.
  • the step of determining whether the shape of the capacitive screen sensing area conforms to the preset regular shape further comprises the following steps:
  • the step of detecting whether the central capacitance sensing amount of the capacitive screen sensing area meets the preset sensing quantity threshold comprises:
  • the central capacitive sensing quantity generally refers to the coordinate point where the value of the sensing capacitance in the sensing area of the capacitive screen is the largest, or the value of the sensing capacitance of the center point of the area of the sensing area of the entire capacitive screen.
  • the preset sensing amount threshold may be set to 50 PF, if the capacitive screen sensing area If the maximum value of the sensed capacitance is less than this value, it can be assumed that the input is a non-human input (refer to Figure 3).
  • the step of detecting whether the central capacitance sensing amount of the capacitive screen sensing area meets the preset sensing quantity threshold comprises:
  • the plurality of coordinate points should be adjacent to each other, which is in line with reality, if the coordinate points of the plurality of large sensing capacitance values existing in the sensing area of the capacitive screen are in the north and the sensing capacitance values of the coordinate points existing between each other Far below them, it can be basically determined that the capacitive sensing area is not a human touch input; using this scheme can improve the anti-electromagnetic interference capability.
  • the sensing capacitance values of all the coordinate points of the preset number are greater than a preset sensing amount threshold. If both are greater than, the central capacitance sensing amount is determined to be consistent with the preset sensing amount threshold. According to the normal situation, the touch input, due to the touch area of the finger, will cause a considerable number of sensing capacitance values to exceed the preset sensing threshold. If there is no threshold value in the capacitive screen. The coordinate point exists, or the number is too small, then it can be basically determined that the capacitive screen sensing area is not artificially input and should not be reported.
  • the capacitive screen sensing area is a coherent detection on the capacitive screen. In the area where the capacitance changes, if two or more capacitive screen sensing areas are detected at the same time, it is determined whether the shape of each capacitive screen sensing area conforms to a preset regular shape. Obtaining, judging and analyzing the upload separately can avoid the occurrence of errors to a certain extent and help to reduce electromagnetic interference.
  • FIG. 2 is a schematic diagram showing the capacitance value of the capacitive screen without touch input according to the embodiment of the present invention
  • FIG. 3 is a capacitive touch screen finger touch according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of the capacitance value of the capacitive screen of the embodiment of the present invention subjected to electromagnetic interference.
  • the shape of the capacitive screen sensing area input by the finger touch is approximately elliptical, which can approximate the long axis and the end state of the ellipse by the center point around the sensing area of the capacitive screen. Judging to determine, the shape of the capacitive screen sensing area caused by electromagnetic interference may appear as a general strip shape, and the short axis direction, the number of capacitive channels spanning only two, according to analysis and judgment, It is obvious that the situation shown in FIG. 3 is an artificial normal input, which can be reported, and in the case of FIG.
  • the electromagnetic interference is input, and the rejection is required without reporting, and the present invention achieves the improvement of the capacitive screen anti-interference by such a method.
  • the value of the sensing capacitance caused by the finger touch input has a range, and the value of the sensing capacitance caused by most of the electromagnetic interference is larger, so that the value of the sensing capacitor is too small or too Large coordinate points can also function to reduce electromagnetic interference.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • FIG. 5 is a second embodiment of an apparatus for resisting electromagnetic interference using the method of any of the present invention, the apparatus comprising:
  • a mobile terminal processor 30 for managing and controlling processing and interaction of data of the mobile terminal
  • the capacitive screen chip 10 is configured to acquire capacitive touch panel sensing area data
  • the determining module 20 is configured to determine whether the shape of the capacitive screen sensing area conforms to a preset regular shape
  • the determining module controls the capacitive screen chip to report the capacitive screen sensing area data to the mobile terminal processor; if not, the reporting is not performed.
  • the judging module may be integrated in the mobile terminal processor or may be separately set.
  • the device of the present invention adds a judging module for judging whether the shape of the capacitive screen sensing area conforms to a preset regular shape, so that the mobile terminal can sense the area data of the capacitive screen before the capacitive screen chip uploads the capacitive screen sensing area data. Screening is performed. If the sensing area of the capacitive screen is triggered by a finger, the shape of the obtained capacitive screen sensing area can be expected to be a predetermined regular shape such as an ellipse or a circle, and this part is reported.
  • the capacitive screen chip reports to the mobile terminal processor for processing; and in other cases, for example, if the capacitive screen receives electromagnetic interference, the shape of the capacitive screen sensing area formed by receiving electromagnetic interference is likely not a preset rule Shapes, if you do not report on this part of the situation, you can reduce the occurrence of jumps on the capacitive screen due to electromagnetic interference. Moreover, due to this mechanism, the capacitive screen can be reduced when performing anti-interference design. The situation of changing the capacitance of the capacitive screen appears, thereby ensuring the sensitivity of the capacitive screen, which not only improves the anti-interference ability of the capacitive screen, but also improves the touch sensitivity of the capacitive screen.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
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Abstract

L'invention concerne un procédé et un dispositif permettant d'assurer une résistance aux interférences électromagnétiques d'un écran tactile capacitif, le procédé consistant : à acquérir des données d'une région d'induction d'un écran tactile capacitif (S1) ; à déterminer si une forme de la région d'induction de l'écran tactile capacitif est conforme à une règle prédéfinie (S2) ; si tel est le cas, à rapporter les données de la région d'induction de l'écran tactile capacitif ; et si tel n'est pas le cas, à ne pas rapporter les données (S3). Au moyen du présent procédé, la résistance aux interférences électromagnétiques de l'écran tactile capacitif peut être améliorée, et l'impact de l'interférence électromagnétique peut être réduit.
PCT/CN2016/107737 2016-02-25 2016-11-29 Procédé et dispositif permettant d'assurer une résistance aux interférences électromagnétiques d'un écran tactile capacitif WO2017143823A1 (fr)

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CN109992161A (zh) * 2019-03-28 2019-07-09 广州小鹏汽车科技有限公司 一种基于触摸屏的压力检测方法及检测装置
CN114895137A (zh) * 2022-06-29 2022-08-12 广东电网有限责任公司佛山供电局 一种供电设备供电质量测试方法

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CN108255360A (zh) * 2018-01-22 2018-07-06 珠海格力电器股份有限公司 触摸屏抗干扰控制方法、装置和系统
CN114337854B (zh) * 2022-01-04 2023-11-24 国家能源集团宁夏煤业有限责任公司 防动力电信号干扰方法和系统
CN115792441B (zh) * 2022-11-23 2024-02-13 苏州科标检测有限公司 辐射抗干扰测试方法及测试系统

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CN114895137B (zh) * 2022-06-29 2023-04-07 广东电网有限责任公司佛山供电局 一种供电设备供电质量测试方法

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