WO2014032485A1 - Système d'écran tactile et procédé de détection synchrone associé - Google Patents

Système d'écran tactile et procédé de détection synchrone associé Download PDF

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Publication number
WO2014032485A1
WO2014032485A1 PCT/CN2013/079489 CN2013079489W WO2014032485A1 WO 2014032485 A1 WO2014032485 A1 WO 2014032485A1 CN 2013079489 W CN2013079489 W CN 2013079489W WO 2014032485 A1 WO2014032485 A1 WO 2014032485A1
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WIPO (PCT)
Prior art keywords
touch
signal
touch screen
detected
touch chip
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PCT/CN2013/079489
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English (en)
Chinese (zh)
Inventor
钟华
邓耿淳
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深圳市汇顶科技股份有限公司
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Publication of WO2014032485A1 publication Critical patent/WO2014032485A1/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
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving

Definitions

  • the present invention relates to the field of touch screens, and in particular, to a touch screen system and a method for synchronous detection thereof.
  • a TFT-LCD (hereinafter referred to as LCD) includes a white light source, a polarizer, and a TFT array (TFT).
  • Array substrate, liquid crystal, color filter, etc.
  • the LCD performs image display, first select the line to be displayed through the gate line (Gate line), and then pass the source line (Source). Line) Outputs the electrical signal corresponding to the image to be displayed to the line, thus completing the display of one line.
  • the image display on all other lines is completed, and the LCD completes one display update, which is also called completing one frame scan.
  • a common capacitive touch screen generally includes a driving layer and a sensing layer separated by a glass or a film, and the two layers are perpendicular to each other.
  • a popular practice is to make the driving layer and the sensing layer of the capacitive touch screen into the interior of the LCD, that is, between the TFT array substrate and the color filter.
  • One implementation method is to use the signal of the LCD itself as the driving signal output end of the touch screen, and add a sensing layer as the signal receiving end of the touch screen, as shown in FIG. 2 .
  • the driving signal and the sensing signal belong to different systems, the former belongs to the LCD, and the latter belongs to the touch chip, which are independent of each other, and the two need to be synchronized in timing to realize accurate demodulation of the driving signal.
  • the second method puts both the driving layer and the sensing layer into the LCD.
  • This method can reduce the thickness of the entire system (LCD + touch screen) and facilitate the development of electronic products in the ultra-thin direction.
  • the method of time division scanning is also adopted. Therefore, it is also necessary to judge the time when the LCD scan is completed, that is, synchronization is required.
  • the touch screen system includes: a touch screen and a touch chip, wherein the touch screen includes: a first communication module, configured to send a detected signal to the touch chip; the touch chip
  • the method includes: a storage module, configured to pre-store a frequency of a driving signal of the touch screen; a second communication module, configured to time, and receive the detected signal of the touch chip when the detection time is up; and a quadrature demodulation module, configured to The frequency of the driving signal is orthogonally demodulated to obtain the signal to be detected, and the determining module is configured to determine whether the amplitude of the signal to be detected is greater than or equal to a first preset threshold, wherein the storing The module is further configured to record the detection time as a driving time period when the amplitude of the signal to be detected is greater than or equal to the first preset threshold, and the synchronization is completed.
  • Another touch screen system is used in an electronic device, including a touch screen and a touch chip, wherein the touch screen includes: a first communication module, configured to send a detected signal to the touch chip; the touch chip
  • the system includes: a storage module, configured to pre-store a frequency range of the display signal of the touch screen; a second communication module, configured to time, and receive the detected signal of the touch chip when the detection time is up; and a quadrature demodulation module, configured to: Performing orthogonal demodulation on the detected signal according to the displayed frequency range to obtain all signals to be detected; and determining, by the determining module, whether the amplitude of all the signals to be detected has at least one greater than or equal to the second And a preset threshold, wherein the storage module is further configured to record the detection time as a driving time period when the amplitudes of all the to-be-detected signals are greater than or equal to a second preset threshold, and the synchronization is completed.
  • the present invention further provides a touch screen system for use in an electronic device, including a touch screen and a touch chip, wherein the touch screen includes: a first communication module, configured to send a detected signal to the touch chip;
  • the method includes: a storage module, configured to pre-store a spectral feature of the driving signal of the touch screen; a second communication module, configured to time, and receive the detected signal of the touch chip when the detection time is up; and an FFT processing module, configured to The detected signal is subjected to FFT processing to obtain a spectral characteristic of the detected signal; and a determining module is configured to determine whether a spectral characteristic of the detected signal is consistent with a spectral characteristic of the driving signal, wherein the storage module further The detecting time is recorded as a driving time period when the spectral feature of the detected signal is consistent with the spectral characteristic of the driving signal, and the synchronization is completed.
  • the present invention further provides another touch screen system for use in an electronic device, including a touch screen and a touch chip, wherein: the touch screen includes: a first communication module, configured to send a detected signal to the touch chip; the touch chip
  • the utility model includes: a storage module, configured to pre-store a spectral feature of the display signal of the touch screen; a second communication module, configured to time, and receive the detected signal of the touch chip when the detection time is up; and an FFT processing module, configured to The detected signal is subjected to FFT processing to obtain a spectral characteristic of the detected signal; and a determining module is configured to determine whether a spectral characteristic of the detected signal is consistent with a spectral characteristic of the display signal, wherein the storage module further And when the spectrum feature of the detected signal is inconsistent with the spectral feature of the display signal, the detection time is recorded as a driving time period, and synchronization is completed.
  • the present invention further provides a touch screen system for use in an electronic device, including a touch screen and a touch chip, wherein the touch screen includes: a first communication module, configured to send a detected signal to the touch chip;
  • the system includes: a storage module, configured to pre-store a frequency range of the display signal of the touch screen; a second communication module, configured to time, and receive the detected signal of the touch chip when the detection time is up; and a quadrature demodulation module, configured to: Performing orthogonal demodulation on the detected signal according to the frequency range of the display signal to obtain all the signals to be detected; and determining, by the determining module, whether the amplitudes of all the signals to be detected are smaller than the third preset a threshold, wherein the storage module is further configured to record the detection time as an idle time period when the amplitudes of all the signals to be detected are smaller than a third preset threshold, and the synchronization is completed.
  • Another touch screen system is used in an electronic device, including a touch screen and a touch chip, wherein: the touch screen includes: a first communication module, configured to send a detected signal to the touch chip; the touch chip
  • the utility model includes: a storage module, configured to pre-store a frequency of a signal of an idle time of the touch screen; a second communication module, configured to time, and receive the detected signal of the touch chip when the detection time is up; and a quadrature demodulation module And performing a quadrature demodulation on the detected signal according to the frequency range of the signal of the idle time of the touch screen to obtain all the signals to be detected; and determining, by the determining module, whether the amplitudes of all the signals to be detected are average
  • the storage module is further configured to record the detection time as an idle time period when the amplitude of the to-be-detected signal is smaller than the fourth preset threshold, and the synchronization is completed.
  • the present invention further provides a touch screen system for use in an electronic device, including a touch screen and a touch chip, wherein the touch screen includes: a first communication module, configured to send a detected signal to the touch chip;
  • the utility model includes: a storage module, configured to pre-store a spectral feature of the display signal of the touch screen; a second communication module, configured to time, and receive the detected signal of the touch chip when the detection time is up; and an FFT processing module, configured to The detected signal is subjected to FFT processing to obtain a spectral characteristic of the detected signal; and a determining module is configured to determine whether a spectral characteristic of the detected signal is consistent with a spectral characteristic of the display signal, wherein the storage module further And when the spectrum feature of the detected signal is inconsistent with the spectral feature of the display signal, the detection time is recorded as an idle time period, and synchronization is completed.
  • the present invention further provides a touch screen system for use in an electronic device, including a touch screen and a touch chip
  • the touch screen includes: a first communication module, configured to send a detected signal to the touch chip
  • the touch chip includes: a storage module for pre-storing the spectral features of the signal of the idle time of the touch screen; a second communication module for timing, and receiving the detected signal of the touch chip when the detection time is up; the FFT processing module, And performing FFT processing on the detected signal to obtain a spectral feature of the detected signal; and a determining module, configured to determine whether a spectral feature of the detected signal and a spectrum characteristic of a signal of an idle time of the touch screen Consistently, wherein the storage module is further configured to record the detection time as an idle time period when the spectral feature of the detected signal is consistent with the spectral feature of the display signal, and the synchronization is completed.
  • the method for synchronous detection of a touch screen system is used in an electronic device, wherein a touch screen is connected to a touch chip, and a frequency of a driving signal is pre-stored in the touch chip, the method comprising the steps of: timing the touch chip, and determining Whether the detection time is reached; if the detection time has elapsed, the touch chip receives the detected signal; the touch chip uses the frequency of the driving signal to perform orthogonal demodulation on the detected signal to obtain a signal to be detected; the touch chip determines the Whether the amplitude of the signal to be detected is greater than or equal to a first preset threshold; if yes, the touch chip records the detection time as a driving time period, and the synchronization is completed.
  • the method for synchronous detection of another touch screen system is used in an electronic device, wherein the touch screen is connected to the touch chip, and the frequency range of the display signal is pre-stored in the touch chip, the method comprising the following steps: the touch chip timing And determining whether the detection time is reached; if the detection time has elapsed, the touch chip receives the detected signal; and the touch chip uses the pair of detected signals in the frequency range of the display signal to perform orthogonal demodulation to obtain all the signals to be detected; The touch chip determines whether at least one of the amplitudes of all the signals to be detected is greater than or equal to a second preset threshold; if not, the touch chip records the detection time as a driving time period, and the synchronization is completed.
  • the method for synchronous detection of another touch screen system is used in an electronic device, wherein the touch screen is connected to the touch chip, and the spectrum feature of the driving signal is pre-stored in the touch chip, the method comprising the following steps: the touch chip timing And determining whether the detection time is reached; if the detection time has elapsed, the touch chip receives the detected signal; the touch chip performs FFT processing on the detected signal to obtain a spectral characteristic of the detected signal; and the touch chip determines the Whether the spectral characteristic of the detection signal is consistent with the spectral characteristic of the driving signal; if so, the touch chip records the detection time as the driving time period, and the synchronization is completed.
  • a touch screen system synchronous detection method is used in an electronic device, wherein a touch screen is connected to a touch chip, and a spectrum feature of the display signal is pre-stored in the touch chip, the method comprising the following steps: the touch chip timing, and determining whether To the detection time; if the detection time has elapsed, the touch chip receives the detected signal; the touch chip performs FFT processing on the detected signal to obtain a spectral characteristic of the detected signal; and the touch chip determines the spectrum of the detected signal Whether the feature is consistent with the spectral characteristic of the display signal; if not, the touch chip records the detection time as a driving time period, and the synchronization is completed.
  • the invention also provides a method for synchronous detection of a touch screen system, which is used in a method for synchronous detection of a touch screen system in an electronic device, wherein the touch screen is connected to the touch chip, and the frequency range of the display signal is pre-stored in the touch chip, the method includes the following Step: the touch chip is timed and determines whether the detection time is reached; if the detection time has elapsed, the touch chip receives the detected signal; and the touch chip performs orthogonal solution by using a pair of detected signals in a frequency range of the display signal.
  • the touch chip determines whether the amplitudes of all the signals to be detected are smaller than a third preset threshold; if both are smaller than the third preset threshold, the touch chip records the detection time. For the idle time period, the synchronization is completed.
  • the method for synchronous detection of another touch screen system is used in an electronic device, wherein the touch screen is connected to the touch chip, and the frequency range of the signal of the idle time of the touch screen is pre-stored in the touch chip, and the method includes the following steps
  • the touch chip is timed and judges whether the detection time is reached; if the detection time has elapsed, the touch chip receives the detected signal; and the touch chip uses the frequency range of the signal of the idle time of the touch screen to perform a pair of detected signals.
  • the touch chip determines whether the amplitudes of all the signals to be detected are smaller than a fourth preset threshold; if both are smaller than the fourth preset threshold, the touch chip records
  • the detection time is an idle time period and is completed synchronously.
  • the invention also provides a method for synchronous detection of a touch screen system, which is used in an electronic device, wherein the touch screen is connected to the touch chip, and the spectrum feature of the display signal is pre-stored in the touch chip, the method comprising the following steps: the touch chip timing And determining whether the detection time is reached; if the detection time has elapsed, the touch chip receives the detected signal; the touch chip performs FFT processing on the detected signal to obtain a spectral characteristic of the detected signal; and the touch chip determines the Whether the spectral characteristic of the detection signal is consistent with the spectral characteristic of the display signal; if not, the touch chip records the detection time as an idle time period, and the synchronization is completed.
  • the method for synchronous detection of another touch screen system is also provided in an electronic device, wherein the touch screen is connected to the touch chip, and the spectral characteristics of the signal of the idle time of the touch screen are pre-stored in the touch chip, and the method includes the following Step: the touch chip is timed and judges whether the detection time is reached; if the detection time has elapsed, the touch chip receives the detected signal; the touch chip performs FFT processing on the detected signal to obtain the spectral characteristic of the detected signal; The touch chip determines whether the spectral characteristic of the detected signal is consistent with the spectral characteristic of the signal of the idle time of the touch screen; if yes, the touch chip records the detection time as an idle time period, and the synchronization is completed.
  • the touch screen system and the method for synchronous detection thereof in the embodiments of the present invention acquire the display time and the driving time of the touch screen or the display time and the idle time by orthogonally demodulating or detecting the FFT of the detected signal by the touch chip, so as to implement the touch.
  • the chip is synchronized with the touch screen.
  • FIG. 1 is a schematic structural view of an LCD in the prior art
  • FIG. 2 is a schematic structural view of an LCD in which a sensing layer is added in the prior art
  • FIG. 3 is a schematic structural view of an LCD in which a driving layer and a sensing layer are added in the prior art
  • FIG. 4 is a block diagram of a touch screen system including the touch screen shown in FIG. 2 according to an embodiment of the present invention
  • FIG. 5 is a block diagram of a touch screen system including the touch screen shown in FIG. 2 according to another embodiment of the present invention.
  • FIG. 6 is a block diagram of a touch screen system including the touch screen shown in FIG. 3 according to an embodiment of the present invention
  • FIG. 7 is a block diagram of a touch screen system including the touch screen shown in FIG. 3 according to another embodiment of the present invention.
  • FIG. 8A is a flowchart of a method for synchronous detection including the touch screen touch screen system shown in FIG. 2 according to an embodiment of the present invention
  • FIG. 8B is a flowchart of a method for synchronous detection including the touch screen touch screen system shown in FIG. 2 according to another embodiment of the present invention.
  • FIG. 9A is a flowchart of a method for synchronous detection including the touch screen touch screen system shown in FIG. 2 according to another embodiment of the present invention.
  • 9B is a flowchart of a method for synchronous detection including the touch screen touch screen system shown in FIG. 2 according to another embodiment of the present invention.
  • 10A is a flowchart of a method for synchronous detection including the touch screen touch screen system of FIG. 3 according to an embodiment of the present invention
  • FIG. 10B is a flowchart of a method for synchronous detection including the touch screen touch screen system shown in FIG. 3 according to another embodiment of the present invention.
  • 11A is a flowchart of a method for synchronous detection including the touch screen touch screen system shown in FIG. 3 according to another embodiment of the present invention.
  • FIG. 11B is a flowchart of a method for synchronous detection including the touch screen touch screen system of FIG. 3 according to another embodiment of the present invention.
  • FIG. 12 is a schematic diagram showing the relationship between the time slice of FIG. 4 and the detected signal strength according to an embodiment of the present invention
  • FIG. 13 is a schematic diagram showing the relationship between the time slice of FIG. 6 and the detected signal strength according to another embodiment of the present invention.
  • FIG. 4 shows a touch screen system including the touch screen 20 of FIG. 2 in accordance with an embodiment of the present invention.
  • the touch screen 20 is communicatively coupled to the touch chip 10 for use in an electronic device (not shown).
  • the electronic device may be a device that requires a touch and display function, such as a mobile phone, a computer notebook, or an Ipad.
  • the touch screen 20 includes a first communication module for transmitting a detected signal to the touch chip 10.
  • the touch chip includes a storage module for pre-storing the frequency of the driving signal of the touch screen 20.
  • the frequency of the drive signal of the touch screen 20 is stored in advance in the touch chip.
  • the second communication module is configured to time and receive the detected signal of the touch chip 10 when the detection time is up.
  • the touch chip 10 starts detecting every 200 to 400 us until it is completed in synchronization with the touch panel 20.
  • a quadrature demodulation module configured to perform orthogonal demodulation on the detected signal according to a frequency of the driving signal, to obtain a signal to be detected.
  • a determining module configured to determine whether the amplitude of the signal to be detected is greater than or equal to a first preset threshold, where the storage module is further configured to record the detection time as the driving time when the amplitude of the signal to be detected is greater than or equal to the first preset threshold Segment, synchronization completed.
  • the first preset threshold is a value measured according to an actual application.
  • the storage module is further configured to record the detection time as the display time period when the amplitude of the signal to be detected is less than the first preset threshold.
  • the touch screen further includes a driving module, configured to generate a driving signal, wherein the second communication module converts the to-be-detected signal into matrix data after the synchronization is completed, and determines whether there is a touch action on the touch screen 20 according to the matrix data. And report the corresponding touch action and coordinates to the electronic device.
  • a driving module configured to generate a driving signal
  • the second communication module converts the to-be-detected signal into matrix data after the synchronization is completed, and determines whether there is a touch action on the touch screen 20 according to the matrix data. And report the corresponding touch action and coordinates to the electronic device.
  • a storage module is configured to pre-store a frequency range of a display signal of the touch screen 20.
  • the quadrature demodulation module is configured to perform orthogonal demodulation on a pair of detected signals according to a frequency range of the display signal to obtain all signals to be detected.
  • a determining module configured to determine whether at least one of the amplitudes of all the signals to be detected is greater than or equal to a second preset threshold, wherein the storage module is further configured to: when at least one of the amplitudes of all the signals to be detected is greater than or equal to a second preset threshold The detection time is recorded as the display time period, and the synchronization is completed.
  • the second preset threshold is a value measured according to an actual application.
  • the storage module is further configured to record the detection time as the driving time period when the amplitudes of all the signals to be detected are both smaller than the second preset threshold.
  • the touch screen further includes a driving module, configured to generate a driving signal, wherein the second communication module converts the detected signal into matrix data after the synchronization is completed, and determines whether there is a touch action on the touch screen 20 according to the matrix data. And report the corresponding touch action and coordinates to the electronic device.
  • a driving module configured to generate a driving signal
  • the second communication module converts the detected signal into matrix data after the synchronization is completed, and determines whether there is a touch action on the touch screen 20 according to the matrix data. And report the corresponding touch action and coordinates to the electronic device.
  • the storage module is further configured to pre-store the frequency of the driving signal, and the second communication module obtains matrix data by performing orthogonal demodulation and analog-to-digital conversion on the detected signal according to the frequency of the driving signal.
  • FIG. 5 shows a touch screen system including the touch screen 20 shown in FIG. 2 in an embodiment of the present invention.
  • the touch screen 20 is communicatively coupled to the touch chip 10 for use in an electronic device (not shown).
  • the electronic device may be a device that requires a touch and display function, such as a mobile phone, a computer notebook, or an Ipad.
  • the touch screen 20 includes a first communication module for transmitting a detected signal to the touch chip 10.
  • the touch chip 10 includes a storage module for pre-storing spectral characteristics of a driving signal of the touch screen 20.
  • the second communication module is configured to time and receive the detected signal of the touch chip 20 when the detection time is up.
  • An FFT (ie, fast Fourier transform) processing module is configured to perform FFT processing on the detected signal to obtain a spectral characteristic of the detected signal.
  • a determining module configured to determine whether a spectral feature of the detected signal is consistent with a spectral feature of the driving signal, wherein the storage module is further configured to record the detection time as a driving time when the spectral feature of the detected signal is consistent with the spectral characteristic of the driving signal Segment, synchronization completed.
  • the storage module is further configured to record the detection time as a display time period when the spectral feature of the detected signal does not match the spectral feature of the driving signal.
  • the touch screen further includes a driving module, configured to generate a driving signal, wherein the second communication module converts the detected signal into matrix data after the synchronization is completed, and determines whether there is a touch action on the touch screen 20 according to the matrix data. The corresponding touch action and coordinates are reported to the electronic device.
  • a driving module configured to generate a driving signal
  • the second communication module converts the detected signal into matrix data after the synchronization is completed, and determines whether there is a touch action on the touch screen 20 according to the matrix data. The corresponding touch action and coordinates are reported to the electronic device.
  • a storage module is configured to pre-store the spectral features of the display signal of the touch screen 20.
  • a determining module configured to determine whether a spectral feature of the detected signal is consistent with a spectral feature of the display signal, wherein the storage module is further configured to record the detection time as a driving time when the spectral feature of the detected signal is inconsistent with the spectral characteristic of the displayed signal Segment, synchronization completed.
  • the storage module is further configured to record the detection time as a display time period when the spectral feature of the detected signal matches the spectral feature of the display signal.
  • the touch screen further includes a driving module, configured to generate a driving signal, wherein the second communication module converts the detected signal into matrix data after the synchronization is completed, and determines whether there is a touch action on the touch screen 20 according to the matrix data. The corresponding touch action and coordinates are reported to the electronic device.
  • a driving module configured to generate a driving signal
  • the second communication module converts the detected signal into matrix data after the synchronization is completed, and determines whether there is a touch action on the touch screen 20 according to the matrix data. The corresponding touch action and coordinates are reported to the electronic device.
  • the storage module is further configured to pre-store the frequency of the driving signal, and the second communication module obtains matrix data by performing orthogonal demodulation and analog-to-digital conversion on the detected signal according to the frequency of the driving signal.
  • Figure 6 shows a touch screen system including the touch screen 20' of Figure 3 in accordance with one embodiment of the present invention.
  • the touch screen 20' is communicatively coupled to the touch chip 10' for use in an electronic device (not shown).
  • the electronic device may be a device that requires a touch and display function, such as a mobile phone, a computer notebook, or an Ipad.
  • the touch screen 20' includes a first communication module for transmitting a detected signal to the touch chip.
  • the touch chip 10' includes a storage module for pre-storing a frequency range of a display signal of the touch screen 20'.
  • the second communication module is for timing and receives the detected signal of the touch chip 10' when the detection time is up.
  • the quadrature demodulation module is configured to perform orthogonal demodulation on a pair of detected signals according to a frequency range of the display signal to obtain all signals to be detected.
  • a determining module configured to determine whether the amplitudes of all the signals to be detected are smaller than a third preset threshold, wherein the storage module is further configured to record the detection time as when the amplitudes of all the signals to be detected are smaller than a third preset threshold The idle time period is completed synchronously.
  • the third preset threshold is a value measured according to an actual application.
  • the storage module is further configured to record the detection time as the display time period when at least one of the amplitudes of all the signals to be detected is greater than or equal to a third preset threshold.
  • the touch chip 10' further includes a driving module for generating a driving signal after the synchronization is completed, wherein the second communication module acquires the sampling signal of the touch screen 20' by the driving signal, and converts the sampling signal into matrix data. And determining whether there is a touch action on the touch screen 20' according to the matrix data, and reporting the corresponding touch action and coordinates to the electronic device.
  • a memory module is provided for pre-storing the frequency of the signal of the idle time of the touch screen 20'.
  • the quadrature demodulation module is configured to perform orthogonal demodulation on a pair of detected signals according to a frequency range of the signal of the idle time of the touch screen 20' to obtain all signals to be detected.
  • a determining module configured to determine whether the amplitudes of all the signals to be detected are smaller than a fourth preset threshold, wherein the storage module is further configured to record the detection time as when the amplitudes of all the signals to be detected are smaller than the fourth preset threshold The idle time period is completed synchronously.
  • the fourth preset threshold is a value measured according to an actual application.
  • the storage module is further configured to record the detection time as the display time period when at least one of the amplitudes of all the signals to be detected is greater than or equal to a fourth preset threshold.
  • the touch chip 10' further includes a driving module for generating a driving signal after the synchronization is completed, wherein the second communication module acquires the sampling signal of the touch screen 20' by the driving signal, and converts the sampling signal into matrix data. And determining whether there is a touch action on the touch screen 20' according to the matrix data, and reporting the corresponding touch action and coordinates to the electronic device.
  • the storage module is further configured to pre-store the frequency of the driving signal, and the second communication module obtains matrix data by performing orthogonal demodulation and analog-to-digital conversion on the detected signal according to the frequency of the driving signal.
  • Fig. 7 shows a touch screen system including the touch screen 20' shown in Fig. 3 in an embodiment of the present invention.
  • the touch screen 20' is communicatively coupled to the touch chip 10' for use in an electronic device (not shown).
  • the electronic device may be a device that requires a touch and display function, such as a mobile phone, a computer notebook, or an Ipad.
  • the touch screen 20' includes a first communication module for transmitting a detected signal to the touch chip 10'.
  • the touch chip 10' includes a storage module for pre-storing spectral characteristics of a display signal of the touch screen.
  • the second communication module is for timing and receives the detected signal of the touch chip 20' when the detection time is up.
  • An FFT processing module is configured to perform FFT processing on the detected signal to obtain a spectral characteristic of the detected signal.
  • a determining module configured to determine whether a spectral feature of the signal to be detected is consistent with a spectral feature of the display signal, where the storage module is further configured to record the detection time as an idle time when the spectral feature of the detected signal is inconsistent with the spectral characteristic of the displayed signal Segment, synchronization completed.
  • the storage module is further configured to record the detection time as a display time period when the spectral feature of the detected signal matches the spectral feature of the display signal.
  • the touch chip 10' further includes a driving module for generating a driving signal after the synchronization is completed, wherein the second communication module acquires the sampling signal of the touch screen 20' by the driving signal, and converts the sampling signal into matrix data. And determining whether there is a touch action on the touch screen 20' according to the matrix data, and reporting the corresponding touch action and coordinates to the electronic device.
  • a storage module is configured to pre-store a spectral feature of a signal of an idle time of the touch screen.
  • the second communication module is for timing and receives the detected signal of the touch chip 20' when the detection time is up.
  • An FFT processing module is configured to perform FFT processing on the detected signal to obtain a spectral characteristic of the detected signal.
  • a judging module configured to determine whether a spectral feature of the signal to be detected is consistent with a spectral characteristic of a signal of an idle time of the touch screen 20', wherein the storage module is further configured to use a signal of the spectrum of the detected signal and the idle time of the touch screen 20' When the spectrum features are consistent, the detection time is recorded as an idle time period, and synchronization is completed.
  • the storage module is further configured to record the detection time as a display time period when the spectral characteristic of the detected signal does not coincide with the spectral characteristic of the signal of the idle time of the touch screen 20'.
  • the touch chip 10' further includes a driving module for generating a driving signal after the synchronization is completed, wherein the second communication module acquires the sampling signal of the touch screen 20' by the driving signal, and converts the sampling signal into matrix data. And determining whether there is a touch action on the touch screen 20' according to the matrix data, and reporting the corresponding touch action and coordinates to the electronic device.
  • FIG. 8A illustrates a method for synchronous detection including the touch screen system of the touch screen 20 of FIG. 2 according to an embodiment of the present invention.
  • the method of synchronous detection of the touch screen system is used in an electronic device, wherein the touch screen 20 is connected to the touch chip 10, and the frequency of the drive signal is stored in advance in the touch chip 10.
  • a driving signal is generated by the driving module of the touch panel 20.
  • step S100 the touch chip 10 turns on the timing
  • the touch chip 10 determines whether the time counted has reached the detection time.
  • the detection time is 200 to 400 us.
  • step S104 the touch screen 20 transmits the detected signal to the touch chip.
  • the touch chip 10 receives the detected signal.
  • step S108 the touch chip 10 orthogonally demodulates the detected signal according to the frequency of the driving signal to obtain a signal to be detected.
  • step S110 the touch chip 10 determines whether the amplitude of the signal to be detected is greater than or equal to a first preset threshold.
  • the first preset threshold is a value measured according to an actual application.
  • step S112 the touch chip records the detection time as the driving period, and the synchronization is completed.
  • the touch chip 10 converts the signal to be detected into matrix data.
  • step S116 the touch chip 10 determines whether there is a touch action on the touch screen 20 according to the matrix data, and reports the corresponding touch action and coordinates to the electronic device.
  • step S118 the touch chip records the detection time as the display time period.
  • the touch chip 10 performs orthogonal demodulation on a pair of detected signals according to the frequency range of the display signal. To get all the signals to be detected.
  • step S110 the touch chip 10 determines whether at least one of the amplitudes of all the signals to be detected is greater than or equal to a second predetermined threshold.
  • the second preset threshold is a value measured according to an actual application.
  • step S112 the touch chip records the detection time as the driving period, and the synchronization is completed.
  • the touch chip 10 converts the detected signal into matrix data.
  • step S116 the touch chip 10 determines whether there is a touch action on the touch screen 20 according to the matrix data, and reports the corresponding touch action and coordinates to the electronic device.
  • step S118 the touch chip records the detection time as the display period.
  • FIG. 9A illustrates a method for synchronous detection including the touch screen system of the touch screen 20 of FIG. 2 according to another embodiment of the present invention.
  • the method for synchronous detection of the touch screen system is used in an electronic device, wherein the touch screen 20 is connected to the touch chip 10, and the spectral characteristics of the driving signal are pre-stored in the touch chip 10.
  • the touch chip 10 is turned on in step S200.
  • the touch chip 10 determines whether or not the detection time is reached.
  • the touch screen 20 transmits the detected signal to the touch screen 10 in step S204.
  • the touch chip 10 receives the detected signal.
  • step S208 the touch chip 10 performs FFT processing on the detected signal to acquire the spectral characteristics of the detected signal.
  • step S210 the touch chip 10 determines whether the spectral characteristics of the detected signal coincide with the spectral characteristics of the drive signal.
  • step S212 the touch chip 10 records the detection time as the driving time period, and the synchronization is completed.
  • the touch chip 10 converts the detected signal into matrix data.
  • step S216 the touch chip 10 determines whether there is a touch action on the touch screen 20 based on the matrix data, and reports the corresponding touch action and coordinates to the electronic device.
  • the touch chip 10 determines that the spectral characteristic of the detected signal does not match the spectral characteristic of the driving signal, and the detected signal is a display signal, the touch chip 10 records the detection time as the display time period in step S218.
  • the touch chip 10 determines whether the spectral characteristics of the detected signal and the spectral characteristics of the display signal are consistent.
  • step S212 the touch chip 10 records the detection time as the driving time period, and the synchronization is completed.
  • the touch chip 10 converts the detected signal into matrix data.
  • step S216 the touch chip 10 determines whether there is a touch action on the touch screen 20 based on the matrix data, and reports the corresponding touch action and coordinates to the electronic device.
  • the touch chip 10 determines that the spectral characteristic of the detected signal matches the spectral characteristic of the driving signal and the detected signal is the display signal, the touch chip 10 records the detection time as the display time period in step S218.
  • FIG. 10A illustrates a method for synchronous detection of a touch screen system including the touch screen 20' of FIG. 3 in accordance with an embodiment of the present invention.
  • the method for synchronous detection of the touch screen system is used in an electronic device, wherein the touch screen 20' is connected to the touch chip 10', and the frequency range of the display signal is pre-stored in the touch chip 10', and the method includes the following steps:
  • the touch chip 10' turns on the timing.
  • the touch chip 10' judges whether or not the detection time is reached.
  • the touch panel 20' transmits a detected signal to the touch chip 10' in step S304.
  • the touch chip 10' receives the detected signal.
  • step S308 the touch chip 10' performs orthogonal demodulation using a pair of detected signals in the frequency range of the display signal to obtain all signals to be detected.
  • step S310 the touch chip 10' determines whether the magnitudes of all the signals to be detected are all smaller than the third predetermined threshold.
  • step S312 the touch chip 10' records the detection time as an idle period, and the synchronization is completed.
  • the touch chip 10' outputs a drive signal to the touch screen 20'.
  • the touch screen 20' receives the drive signal and obtains a sample signal based on the drive signal.
  • step S318 the touch chip 10' converts the sampled signal into matrix data, and determines whether there is a touch action on the touch screen 20' based on the matrix data, and reports the corresponding touch action and coordinates to the electronic device.
  • step S320 the touch chip 10' records the detection time as the display period.
  • step S308 the touch chip 10' utilizes the idle time signal of the touch screen 20'.
  • the frequency range of a pair of detected signals is quadrature demodulated to obtain all signals to be detected.
  • step S310 the touch chip 10' determines whether the amplitudes of the signals to be detected are all smaller than the fourth predetermined threshold.
  • step S312 the touch chip 10' records the detection time as an idle period, and the synchronization is completed.
  • the touch chip 10' outputs a drive signal to the touch screen 20'.
  • the touch screen 20' receives the drive signal and obtains a sample signal based on the drive signal.
  • step S318 the touch chip 10' converts the sampled signal into matrix data, and determines whether there is a touch action on the touch screen 20' based on the matrix data, and reports the corresponding touch action and coordinates to the electronic device.
  • step S320 the touch chip 10' records the detection time as the display period.
  • FIG. 11A illustrates a method for synchronizing detection of a touch screen system of the touch screen 20' shown in FIG. 3 according to another embodiment of the present invention.
  • the method for synchronous detection of the touch screen system is used in an electronic device, wherein the touch screen 20' is connected to the touch chip 10', and the spectral characteristics of the display signal are pre-stored in the touch chip 10', and the method includes the following steps:
  • the touch chip 10' turns on the timing.
  • the touch chip 10' judges whether or not the detection time is reached.
  • the touch screen 20' transmits the detection signal to the touch chip 10' in step S404.
  • the touch chip 10' receives the detection signal.
  • the touch chip 10' performs FFT processing on the detected signal to acquire the spectral characteristics of the detected signal.
  • step S410 the touch chip 10' determines whether the spectral characteristics of the detected signal coincide with the spectral characteristics of the display signal.
  • step S412 the touch chip records the detection time as an idle time period, and the synchronization is completed.
  • the touch chip 10' outputs a drive signal to the touch screen 20'.
  • the touch screen 20' receives the drive signal and obtains a sample signal based on the drive signal.
  • step S4108 the touch chip 10' receives the sampling signal, and judges whether there is a touch action on the touch chip 10' based on the matrix data, and reports the corresponding touch action to the electronic device.
  • step S420 the touch chip 10' records the detection time as the display time period.
  • the touch chip 10' determines the spectral characteristics of the detected signal and the touch screen. Whether the spectral characteristics of the 20' idle time signal are consistent.
  • step S412 the touch chip records the detection time as an idle time period, and the synchronization is completed.
  • the touch chip 10' outputs a drive signal to the touch screen 20'.
  • the touch screen 20' receives the drive signal and obtains a sample signal based on the drive signal.
  • step S4108 the touch chip 10' receives the sampling signal, and judges whether there is a touch action on the touch chip 10' based on the matrix data, and reports the corresponding touch action to the electronic device.
  • step S420 the touch chip 10' records the detection time as the display time period.
  • FIG. 12 is a diagram showing the relationship between the time slice and the detected signal intensity of FIG. 4 according to an embodiment of the present invention.
  • the normal display time is 12 ms, and the touch scan time (ie, drive time) is 4.67 ms.
  • the touch chip 10 periodically demodulates the detected signal by orthogonal demodulation, and the frequency is consistent with the driving frequency.
  • the time slice is less than 4 ms, so as to ensure that the touch screen is not missed. 20 signals.
  • the demodulated signal is weak, such as the small white block shown in FIG.
  • the resulting signal strength is somewhere in between, as in the gray block of Figure 12.
  • the touch chip determines whether the magnitude of the detected signal that is orthogonally demodulated is greater than or equal to a first preset threshold. If the threshold is greater than or equal to the first preset threshold, the detected signal is considered to be a touch scan, and the value may be used. The coordinate calculation is considered to be a display signal if it is less than the first preset threshold.
  • FIG. 13 is a diagram showing the relationship between the time slice and the detected signal intensity of FIG. 6 according to an embodiment of the present invention.
  • the normal display time is 12ms and the idle time is 4.67ms.
  • the touch chip 10' demodulates the detected signal by means of orthogonal demodulation periodically, and the frequency is in the frequency range of the display signal.
  • the time slice is less than 4 ms.
  • the demodulated signal is relatively strong, as shown by the slashed small block shown in FIG. .
  • the signal obtained after demodulation is relatively weak, as shown in Fig. 13 as a small white block.
  • the resulting signal strength is somewhere in between, as in the gray block of Figure 13.
  • the touch chip 10 ′ determines whether the amplitude of the detected signal after the orthogonal demodulation is greater than or equal to a third preset threshold. If the value is smaller than the third preset threshold, the touch screen 20 ′ is currently in an idle time period, and no signal is output. This value can be used for coordinate calculation, and if it is greater than the third preset threshold, it is considered to be a display signal.
  • the frequency of the driving signal is greater than the maximum value of the frequency range of the display signal.
  • the touch screen system in the embodiment of the present invention acquires the display time and the driving time of the touch screen or the display time and the idle time by performing orthogonal demodulation or FFT change on the detected signal by the touch chip, so as to realize synchronization between the touch chip and the touch screen. Effectively improve the accuracy of the touch screen.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)

Abstract

Un système d'écran tactile comprend un écran tactile et une puce tactile. L'écran tactile comporte un premier module de communication utilisé pour envoyer un signal détecté à la puce tactile. La puce tactile comporte un module de mémoire utilisé pour prémémoriser une fréquence d'un signal de pilotage de l'écran tactile, un second module de communication utilisé pour synchroniser et recevoir le signal détecté de la puce tactile lors d'un temps de détection, un module de démodulation en quadrature utilisé pour exécuter une démodulation en quadrature sur le signal détecté en fonction de la fréquence du signal de pilotage et obtenir un signal devant être détecté, ainsi qu'un module de détermination utilisé pour déterminer si une valeur d'amplitude du signal devant être détecté est supérieure ou égale à un premier seuil prédéterminé. Le module de mémoire est en outre utilisé pour enregistrer le temps de détection à titre de segment temporel de pilotage quand la valeur d'amplitude du signal devant être détecté est supérieure ou égale au premier seuil prédéterminé de manière à achever la synchronisation. D'après la présente invention, une puce tactile exécute une démodulation en quadrature sur un signal détecté ou obtient un temps d'affichage et un temps de pilotage, ou le temps d'affichage et un temps de disponibilité de l'écran tactile par l'intermédiaire d'une modification de FFT, de manière à implémenter la synchronisation de la puce tactile et d'un écran tactile.
PCT/CN2013/079489 2012-08-29 2013-07-16 Système d'écran tactile et procédé de détection synchrone associé WO2014032485A1 (fr)

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