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WO2018161264A1 - Puce de commande tactile, écran tactile capacitif, stylet actif capacitif et procédé de communication bidirectionnelle pour écran tactile capacitif et stylet actif capacitif - Google Patents

Puce de commande tactile, écran tactile capacitif, stylet actif capacitif et procédé de communication bidirectionnelle pour écran tactile capacitif et stylet actif capacitif Download PDF

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Publication number
WO2018161264A1
WO2018161264A1 PCT/CN2017/075906 CN2017075906W WO2018161264A1 WO 2018161264 A1 WO2018161264 A1 WO 2018161264A1 CN 2017075906 W CN2017075906 W CN 2017075906W WO 2018161264 A1 WO2018161264 A1 WO 2018161264A1
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WO
WIPO (PCT)
Prior art keywords
signal
capacitive
touch screen
frequency point
active pen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/075906
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English (en)
Chinese (zh)
Inventor
陈小祥
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Goodix Technology Co Ltd
Original Assignee
Shenzhen Huiding Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Huiding Technology Co Ltd filed Critical Shenzhen Huiding Technology Co Ltd
Priority to PCT/CN2017/075906 priority Critical patent/WO2018161264A1/fr
Priority to CN201780000113.3A priority patent/CN109074200B/zh
Publication of WO2018161264A1 publication Critical patent/WO2018161264A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
    • 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
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • 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
    • G06F3/0441—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using active external devices, e.g. active pens, for receiving changes in electrical potential transmitted by the digitiser, e.g. tablet driving signals
    • 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
    • G06F3/0442—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using active external devices, e.g. active pens, for transmitting changes in electrical potential to be received by the digitiser
    • 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
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Definitions

  • the invention relates to a touch chip applied to a capacitive touch screen, in particular to a touch chip capable of two-way communication between a capacitive touch screen and a capacitive active pen and allowing the capacitive active pen to dynamically switch the output signal frequency.
  • a typical capacitive touch screen 2 with a display function has a touch screen sensing layer 21 , a display module 22 , a glass cover 23 , and a touch screen sensing layer 21 and a display module 22 respectively. And an optically clear adhesive layer (OCA) 24 and 25 interposed between the touch screen sensing layer 21 and the cover glass 23.
  • the touch screen sensing layer 21 includes a driving electrode channel and a sensing electrode channel
  • the display module 22 is, for example, a liquid crystal display (LCD) module.
  • a coupling capacitor is formed between the tip electrode of the capacitive active pen 1 and each of the driving electrode channels or the sensing electrode channels of the touch panel sensing layer 21.
  • the tip electrode of the capacitive active pen 1 outputs a signal, these signals are transmitted to the driving electrode channel and the sensing electrode channel through the coupling capacitor, and the detected signal intensity on these channels becomes smaller as the distance from the pen tip is smaller.
  • the two-dimensional coordinates of the position of the nib of the capacitive active pen 1 can be calculated by separately calculating the signal strengths of the coupling signals on the driving electrode channel and the sensing electrode channel.
  • the driving electrode channel and the sensing electrode channel in the touch screen sensing layer 21 receive the output signal of the pen tip electrode of the capacitive active pen 1
  • the driving chip of the display module 22 under the touch screen sensing layer 21 is also simultaneously output.
  • Drive signal to the display unit to refresh the display screen this drive
  • the dynamic signal is also coupled to the touch screen sensing layer 21 such that the signal-to-noise ratio (SNR) of the output signal of the capacitive active pen 1 detected by the control chip connected to the touch screen sensing layer 21 is deteriorated. .
  • SNR signal-to-noise ratio
  • Such an object from the capacitive touch screen 2 and the capacitive active pen 1 , such as the display module 22 , and the coupling signal between the touch screen sensing layer 21 form an interference signal for the capacitive active pen 1 .
  • the distance between the driving signal layer of the display module 22 or the display module 22 and the sensing electrode channel is smaller than the distance between the pen tip of the capacitive active pen 1 and the sensing electrode channel, so that the interference signal has a large
  • the coordinates of the capacitive active pen 1 may be shaken, and a point may affect the normal operation of the user.
  • the present invention discloses a two-way communication method of a touch chip, a capacitive touch screen, a capacitive active pen, a capacitive touch screen and a capacitive active pen, which is intended to remove a capacitive touch screen and a capacitive active pen.
  • the interference signal of the object affects the normal operation of the capacitive active pen on the capacitive touch screen, and improves the pen writing effect of the user.
  • the present invention discloses a touch chip connected to a capacitive touch screen.
  • the capacitive touch screen includes a plurality of driving electrode channels and a plurality of sensing electrode channels, and the touch chips include electrical connections with each other.
  • the first control unit drives the multiplexing unit to electrically connect the sensing electrode channel and the sensing circuit, the driving circuit does not output any signal to the driving electrode channel, and the first control unit drives
  • the sensing circuit detects a first signal from the object except the capacitive touch screen and is received by the sensing electrode channel, and performs spectrum analysis on the first signal to select a minimum intensity value of the first signal Or a frequency point that differs from the minimum intensity value by less than a set threshold as a working frequency point.
  • the first control unit drives the multiplexing unit to electrically connect the driving circuit with the driving power and the channel.
  • the object except the capacitive touch screen further includes a display module, the display module is disposed at a distance from the sensing electrode channel, and the first signal further includes the display module coupling a signal to the sensing electrode channel.
  • the touch chip further includes a minimum interference frequency selection unit electrically connected to the first control unit, and the first control unit drives the minimum interference frequency selection unit to After the first signal is subjected to spectrum analysis, the working frequency point is selected.
  • the capacitive touch screen is further touched by a capacitive active pen
  • the first control unit drives the multiplexing unit to be electrically connected to the sensing electrode channel and the driving circuit. And driving the driving circuit to send a second signal loaded with the working frequency point information to the driving electrode channel and the sensing electrode channel and coupled to the capacitive active pen.
  • the transmitting of at least two of the second signals includes the transmission of one data bit.
  • the touch chip further includes a modulation unit electrically connected to the first control unit, the first control unit driving the modulation unit to load the working frequency point information to In the second signal.
  • the first control unit detects a third signal sent by the capacitive active pen, and the detected current frequency of the third signal is different from the frequency of the working frequency point but Before the frequency of the working frequency point has not been switched, the frequency of the third signal in the current period and the next period is alternately detected.
  • the capacitive active pen includes a control chip
  • the pen control chip includes a second control unit electrically connected to each other, a tip electrode and a frequency point switching unit, and the second control The unit sequentially drives the nib electrode to send a third signal to the capacitive touch screen, driving the nib electrode to detect and receive the second signal, and decomposing the working frequency information from the second signal, And driving the frequency point switching unit to switch the frequency point of the third signal sent in the next period from the current periodic frequency point to the working frequency point.
  • the pen control chip further includes a demodulation unit electrically connected to the second control unit, and the second control unit drives the demodulation unit to transmit the working frequency information from the Decomposed in the second signal.
  • the pen control chip further includes a check unit electrically connected to the second control unit, the second control unit driving the check unit to verify the decomposition from the second signal The correctness of the working frequency information.
  • the first control unit drives the multiplexing unit to change both the driving electrode channel and the sensing electrode channel when the third signal is sent to the capacitive touch screen. Electrically connecting to the sensing circuit and driving the sensing circuit to detect the third signal, comparing The current periodic frequency point of the third signal and the working frequency point.
  • the first control unit drives the sensing circuit to detect that the detection frequency value of the third signal is equal to a transmission frequency value that the second control unit drives the nib electrode to transmit the third signal.
  • the time required for the second control unit to drive the nib electrode to detect the second signal once is equal to the time required for the first control unit to drive the driving circuit to send the second signal once.
  • the second control unit drives the nib electrode to detect the time required for each of the second signals to be 100 us.
  • the present invention discloses a capacitive touch screen that is coupled to the touch chip of one of the previous embodiments.
  • the present invention discloses a capacitive active pen that communicates bidirectionally with a capacitive touch screen to which the touch chip of one of the preceding embodiments is coupled.
  • the present invention discloses a two-way communication method between a capacitive touch screen and a capacitive active pen.
  • the method includes the following steps in each communication cycle: the capacitive touch screen detects the capacitive touch screen and the capacitor a first signal of the object except the active pen, and performing spectrum analysis on the first signal, and selecting a minimum intensity value of the first signal or a frequency point different from the minimum intensity value by less than a set threshold As the working frequency point, when the capacitive active pen touches the capacitive touch screen, the capacitive touch screen loads the working frequency point information in a second signal; and the capacitive active pen touches the In the capacitive touch screen, the capacitive touch screen detects a third signal sent by the capacitive active pen; when the capacitive active pen touches the capacitive touch screen, the capacitive touch screen determines the When the current periodic frequency of the third signal is different from the working frequency, the capacitive touch screen sends the second signal to the capacitive active pen; When the capacitive active pen touches the
  • the method for bidirectional communication between the capacitive touch screen and the capacitive active pen further includes the following steps: when the capacitive active pen touches the capacitive touch screen, the capacitive touch screen determines the third signal The capacitive touch screen continues when the current periodic frequency is the same as the working frequency Detecting a current periodic frequency of the third signal.
  • the method for bidirectional communication between the capacitive touch screen and the capacitive active pen further includes the following steps: when the capacitive active pen touches the capacitive touch screen, the capacitive touch screen determines the third signal When the frequency point has not been switched from the current periodic frequency point to the working frequency point, the capacitive touch screen detects the current periodic frequency point of the third signal in a current period and detects the third time in a next period The new frequency of the signal.
  • the method for bidirectional communication between the capacitive touch screen and the capacitive active pen further includes the following steps: when the capacitive active pen touches the capacitive touch screen, the capacitive active pen is verified from the first The correctness of the working frequency point information decomposed by the two signals.
  • the touch sensor connected to the capacitive touch screen detects the interference of the capacitive touch screen and the capacitive active pen, including the interference signal generated by the display module, and performs spectrum analysis on the interference signal, and selects one.
  • the minimum intensity value of the interference signal or the frequency point that differs from the minimum intensity value by less than a set threshold is used as an optimal working frequency point, and the optimal working frequency point is sent to the capacitive active pen through the touch chip.
  • the pen control chip connected by the capacitive active pen can receive the optimal working frequency point information, and select the driving frequency according to the optimal working frequency point, so as to avoid the interference signal generated by the display module, so that
  • the use of the capacitive active pen will not be affected by the interference signal of high intensity, and the jitter or the point will be shaken, and the touch glitch which may be caused by the interference signal with less intensity is avoided, and the normal operation of the capacitive active pen is ensured by the user.
  • the use of the threshold setting avoids frequent switching between several frequency points where the interference signal strengths differ very little.
  • FIG. 1 is a schematic view showing a known capacitive touch screen structure with display function and a matched capacitive active pen.
  • FIG. 2 is a schematic diagram showing two-way communication between a capacitive touch screen and a matched capacitive active pen according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram showing the signal output and input of the touch chip in the finger detection mode of the capacitive touch screen according to an embodiment of the invention.
  • FIG. 4 is a schematic diagram showing signal input of a touch chip in a pen signal detection mode of a capacitive touch screen according to an embodiment of the invention.
  • FIG. 5 is a schematic diagram showing signal input of a touch chip in a pen signal detection mode of a capacitive touch screen according to an embodiment of the invention.
  • FIG. 6 is a block diagram showing the connection relationship between the touch chip and the pen control chip according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram showing signal detection timings of a capacitive touch screen and a capacitive active pen in a two-way communication according to an embodiment of the present invention.
  • FIG. 8 is a flow chart showing the signal processing process of the touch screen end in the two-way communication method of the capacitive touch screen and the capacitive active pen according to an embodiment of the invention.
  • FIG. 9 is a flow chart showing the signal processing process of the pen end in the two-way communication method of the capacitive touch screen and the capacitive active pen according to an embodiment of the present invention.
  • the invention discloses a two-way communication method of a touch chip, a capacitive touch screen, a capacitive active pen, a capacitive touch screen and a capacitive active pen to avoid signal interference of the display unit.
  • the basic fabrication principles and methods of the capacitive touch screen and the capacitive active pen are known to those of ordinary skill in the art, and therefore, the description below will not be fully described. It is understood that the specific embodiments described below are merely illustrative of the invention and are not intended to limit the invention.
  • the related description of the chip involved in the present invention may be a single chip or a combination of multiple chips, or may refer to a collection of multiple circuits, and is not limited to a specific combination or package.
  • the circuits, units, and modules included therein may be a distributed circuit structure or an integrated circuit in the form of a chip.
  • the capacitive touch screen 20 can optionally have a display function, and thus has at least one touch screen sensing layer 210 and one display module 220.
  • the display module 220 is disposed under the touch screen sensing layer 210 to form an OUT-CELL structure, and optionally has a glass cover 230, optically transparent between the touch screen sensing layer 210 and the display module 220.
  • the display module 220 is disposed at a distance from the touch screen sensing layer 210.
  • the touch screen sensing layer 210 can also be disposed inside the display module 220 to form an IN-CELL structure.
  • the driving signal layer of the display module 220 is disposed at a distance from the touch screen sensing layer 210.
  • Figure 3 As shown in FIG. 5, in the embodiment, the touch screen sensing layer 210 of the capacitive touch screen 20 includes a driving electrode channel Y and a sensing electrode channel X, and sends a signal to the driving electrode through an electrically connected touch screen controller 260. Channel Y, and receives signals from drive electrode channel Y and/or sense electrode channel X.
  • the capacitive touch screen 20 is in two-way communication with a capacitive active pen 10 (shown by arrows 52 and 53 in the figure), and the capacitive touch screen 20 is not only capacitive.
  • the active pen 10 receives a signal (hereinafter referred to as a third signal) 53 and also transmits a signal (hereinafter referred to as a second signal) 52 to the capacitive active pen 10.
  • the driving electrode channel Y and the sensing electrode channel X of the touch screen sensing layer 210 are both used as the transmitting electrodes (or transmitting electrodes) of the second signal 52 except for the receiving electrodes of the third signal 53.
  • the display module 220 belongs to an object other than the capacitive touch screen 20 and the capacitive active pen 10. Since the interference signal from the display module 220 is shielded by the electrodes in the touch screen sensing layer 210 when it is transmitted upward, the transmission of the second signal 52 is not affected. Therefore, the frequency of the second signal 52 transmitted by the capacitive touch screen 20 to the capacitive active pen 10 can be fixed.
  • the touch chip 260 electrically connected to the driving electrode channel Y and the sensing electrode channel X has a control unit 261, a driving circuit 262, a sensing circuit 263, and a multiplex circuit electrically connected to each other.
  • the multiplexing unit 264 has a channel switching function, and the driving electrode channel Y and the sensing electrode channel X can be selectively connected to one of the driving circuit 262 and the sensing circuit 263 by the operation of the multiplexing unit 264.
  • the signal from the driving circuit 262 can be sent to the driving electrode channel Y, and the sensing circuit 263 can also receive signals from the driving electrode channel Y and/or the sensing electrode channel X.
  • the touch chip 260 further has a minimum interference frequency selection unit 265 and a modulation unit 266 electrically connected to the control unit 261 for respectively causing interference to the components other than the capacitive touch screen 20 and the capacitive active pen 10.
  • the signal referred to as the first signal 51, performs spectral analysis to find the frequency of the minimum intensity value (ie, the frequency with the least interference), and selects the frequency of the minimum intensity value or differs from the minimum intensity value by less than a set threshold.
  • the frequency point is used as the working frequency point, and the working frequency point information is loaded into the second signal 52.
  • the spectrum analysis here specifically refers to sampling the first signal 51, and converting the sampled time domain signal into a frequency domain signal by a Fast Fourier Transform (FFT) module.
  • FFT Fast Fourier Transform
  • the capacitive active pen 10 has a control chip 11 including a control unit 111, a frequency switching unit 112, a demodulation unit 113 and a verification unit 114 electrically connected to each other for controlling transmission to the capacitive type.
  • the frequency of the third signal 53 of the touch screen 20, the frequency of the third signal 53 is dynamically switched, the operating frequency information of the received second signal 52 is decomposed, and the correctness of the information is verified.
  • the touch chip 260 controls the second signal 52 in addition to the third signal 53 by the control unit 261.
  • the pen control chip 11 controls the second signal 53 and switches the frequency in addition to the second signal 52 detected by the control unit 111.
  • the touch chip 260 of the capacitive touch screen 20 can alternately perform the following four modes in the detection timing in each cycle: (1) Finger touch detection mode: mutual capacitance detection mode detection can be adopted.
  • the multi-finger touch is as shown in FIG. 3.
  • the control unit 261 drives the multiplexing unit 264 to perform channel switching, and the driving electrode channel Y is connected to the driving circuit 262 through the multiplexing unit 264, and the sensing electrode channel X
  • the multiplexer unit 264 is connected to the sensing circuit 263, the finger 3 touches the capacitive touch screen 20, and the driving circuit 262 of the touch chip 260 outputs a driving signal to the driving electrode channel Y, and drives the electrode channel Y and the sensing electrode channel X.
  • the coupling capacitance is coupled to the sensing electrode channel X and detected by the sensing circuit 263.
  • the current touch position of the finger 3 can be calculated by the detected amount of change in the coupled signal on the sensing electrode channel X.
  • Noise detection mode a detection mode of a signal generated by an object other than the capacitive touch screen 20 and the capacitive active pen 10, such a signal forming an operation of the capacitive active pen on the capacitive touch screen
  • the interference includes signals from display module 220 and signals from the charger.
  • the control unit 261 drives the multiplexing unit 264 to perform channel switching, the driving electrode channel Y is connected to the driving circuit 262 through the multiplexing unit 264, and the sensing electrode channel X is connected to the sensing through the multiplexing unit 264.
  • the circuit 263, the driving circuit 262 of the touch chip 260 does not output any signal to the driving electrode channel Y, that is, the driving circuit 262 does not output a driving signal to the driving electrode channel Y, and only the sensing circuit 263 detects that the sensing electrode channel X is received. signal of.
  • a coupling signal from the display module 220 coupled to the sensing electrode channel X is detected.
  • These detected signals will be spectrally analyzed by control unit 261 to find the frequency of the signal with the smallest intensity value (i.e., the frequency with the least interference).
  • the spectrum analysis specifically, samples the signals generated by the capacitive touch screen 20 and the objects other than the capacitive active pen 10, and passes the sampled time domain signal through Fast Fourier Transform (Fast Fourier Transform).
  • the FFT is converted to a frequency domain signal. This noise detecting mode can be performed regardless of whether there is a finger 3 or a touch of the capacitive active pen 10 on the capacitive touch screen 20.
  • the noise detecting mode can be performed as long as the driving circuit 262 does not output a signal to the driving electrode channel Y or the driving circuit 262 is disconnected from the driving electrode channel Y.
  • the noise detecting mode can be performed as long as the pen tip of the capacitive active pen 10 has not yet transmitted a signal.
  • Pen signal detection mode that is, the third signal 53 emitted by the pen tip of the capacitive active pen 10 shown in FIG. 2 is detected, thereby obtaining the position of the pen point coordinate of the capacitive active pen 10. As shown in FIG.
  • the control unit 261 drives the multiplexing unit 264 to perform channel switching, which is controlled by the control unit 261.
  • the driving circuit 262 does not work, that is, does not output a driving signal
  • the driving electrode channel Y and the sensing electrode channel X are connected to the sensing circuit 263 through the multiplexing unit 264, and the capacitive active pen 10 contacts the capacitive touch screen 20,
  • the sensing circuit 263 sequentially detects the signal amount of the coupling signal coupled to the driving electrode channel Y and the sensing electrode channel X by the third signal 53 for synchronizing the detection frequency of the third signal 53 by the touch chip 260 and the third signal 53.
  • Frequency hopping coding mode that is, outputting or transmitting the second signal 52 shown in FIG. 2 in the coding format, and notifying the frequency point of the minimum intensity value found by the capacitive active pen 10 in the noise detection mode (ie, the interference is minimal). Frequency point) or a frequency point that differs from the intensity minimum by less than a set threshold.
  • the control unit 261 drives the multiplexing unit 264 to perform channel switching. Through the control of the control unit 261, the driving electrode channel Y and the sensing electrode channel X pass through the multiplexing unit 264.
  • the capacitive active pen 10 contacts the capacitive touch screen 20, and the second signal 52 is output or transmitted by the driver circuit 262 and coupled to the tip electrode of the capacitive active pen 10.
  • the pen control chip 11 of the capacitive active pen 10 can confirm whether or not the capacitive touch panel 20 outputs a valid signal at the current time.
  • the timing of the pen signal detection mode and the frequency hopping coding mode can be represented by the T1 time period and the T2 time period, respectively.
  • the pen tip of the capacitive active pen 10 transmits the third signal 53, and the time required to transmit the third signal 53 once may be 100 us or 1 ms, and the touch chip of the capacitive touch screen 20
  • the 260 is coupled to the signal quantity of the coupled signal on the driving electrode channel Y and the sensing electrode channel X by the detected third signal 53 to complete the timing synchronization of the pen and the screen, the coordinate calculation of the pen tip position, and the transmission of the code of the button and the pressure of the pen end. (S indicates transmission and R indicates reception).
  • the tip electrode of the capacitive active pen 10 is controlled by the pen control chip 11, in particular, driven by the control unit 111, and is switched from the transmission signal mode to the reception signal mode to receive the capacitive touch screen 20.
  • the transmitted second signal 52 (in the figure, S indicates transmission, and R indicates reception).
  • the frequency of the second signal 52 transmitted by the capacitive touch screen 20 to the capacitive active pen 10 is fixed, but the output may or may not be output to transmit data each time the second signal 52 is transmitted.
  • the time required for the capacitive touch screen 20 to transmit the second signal 52 once is 100 us, and one data bit (Bit) can be transmitted every time the second signal 52 is transmitted two or more times.
  • the signal may be output within the time required to send the first second signal, and the second signal is transmitted.
  • the signal is not output for the time required for the second second signal; if the data bit "0" needs to be transmitted, the signal is not output for the time required to transmit the first and second second signals.
  • the pen control chip 11 of the capacitive active pen 10 detects the time required for each second signal 52 and can transmit the second time each time.
  • the time required for the signal 52 is the same, for example 100us.
  • Second secondary signal 52 In the example of FIG. 7, in order to accommodate the synchronization error between the pen end and the screen end, only three data bits are transmitted in the time required to transmit the second signal 52 six times.
  • the minimum interference frequency selection unit 265 electrically connected thereto is driven by the control unit 261 to capacitively.
  • the frequency of the interference signal or the first signal 51 having the smallest intensity value ie, the frequency with the least interference
  • the third signal 53 is detected by the control unit 261 .
  • the transmission frequency value of the third signal 53 should be the same as the detection frequency value of the touch-tip 260 detecting the tip coordinate of the capacitive active pen 10, otherwise the pen will be in an unusable state.
  • the frequency of the third signal 53 currently issued by the tip of the capacitive active pen 10 is 500 Khz
  • the control unit 261 of the touch chip 260 is also detecting the signal of 500 Khz to calculate the position of the tip coordinate of the capacitive active pen 10, and the pen can be normal.
  • the control unit 261 If the frequency of the third signal 53 currently issued by the pen tip is 500Hhz, and the control unit 261 detects the position of the pen point coordinate by detecting the signal of 300Khz, the control unit 261 will not detect the valid signal, and always think that there is no pen currently. Signal, the pen is in an unusable state. Therefore, when the touch chip 260 of the capacitive touch screen 20 performs the pen signal detection mode, it is necessary to ensure that the frequency of the pen end and the screen end correspond.
  • the modulation unit 266 is driven by the control unit 261 to select the frequency of the selected minimum intensity value (ie, interference).
  • the minimum frequency point) or the sequence number corresponding to the frequency point whose difference from the intensity minimum value is less than a set threshold value is modulated by the data bit representation or coded information and the check bit information (hereinafter collectively referred to as interference minimum frequency point information). It is loaded into the second signal 52 and detected by the pen control chip 11. For example, when there are 8 different frequency points selectable, the noise detection mode will analyze which of the 8 frequency points has the least interference, and select the frequency point corresponding to the frequency point with the least interference frequency.
  • the information represented by or encoded by 3 data bits (Bit) and the information of the check bits are mixed into the second signal 52.
  • the pen control chip 11 drives the frequency point switching unit 112, the demodulation unit 113, and the verification unit 114 to operate through the control unit 111, and the received second signal 52 Performing demodulation to obtain data including information such as an encoding of the frequency point of the interference minimum frequency point or the intensity minimum value less than a set threshold value, and a parity bit, and further utilizing the information correctness of the parity check data and
  • the third signal to be output in the next cycle 53 The frequency point is switched to a frequency point where the interference minimum frequency point or the intensity minimum value differs by less than a set threshold.
  • the touch chip 260 executes the following step.
  • Step 711 Spectrum analysis.
  • the control unit 261 of the touch chip 260 performs spectrum analysis on the received interference signal or the first signal 51, and converts the time domain signal of the sampled first signal 51 into a frequency through a fast Fourier transform module. Domain signal.
  • Step 712 Select the frequency point with the least interference.
  • the minimum interference frequency selection unit 265 is driven by the control unit 261 to perform the spectrum analysis on the first signal 51 to select an interference signal or a frequency point with a minimum intensity value in the first signal 51 (ie, interference). The smallest frequency point) or a frequency point that differs from the minimum intensity value by less than a set threshold as the operating frequency point.
  • Step 713 Determine whether the current frequency point is a working frequency point.
  • the control unit 261 compares the frequency of use of the current cycle output or transmission of the third signal 53 by the capacitive active pen 10 with the operating frequency selected in step 712, and determines the current periodic frequency of the third signal 53. Whether the point is the selected working frequency point. Otherwise, it enters the frequency hopping state and performs step 714. If yes, go to step 715.
  • Step 714 Determine whether the pen end frequency hopping is completed.
  • the control unit 261 determines whether the frequency of the current period output third signal 53 has been switched to the operating frequency point, that is, the frequency hopping is completed. If the frequency hopping is completed, step 715 is performed. If the frequency hopping is not completed, step 716 is performed.
  • Step 715 Detect the current frequency point.
  • the control unit 261 continues to detect the current cycle frequency of the third cycle 53 of the current cycle of the capacitive active pen 10, and then performs step 717.
  • Step 716 alternately detecting new and old frequency points.
  • the control unit 261 detects the frequency point of the current output third signal 53 in the current cycle, and detects the new frequency point of the output third signal 53 in the next cycle until the frequency of the third signal 53 is detected. Has been switched to the working frequency point. In this case, it can be ensured that after entering the frequency hopping state, the control unit 261 can still detect that the pen control chip 11 has not successfully received the working frequency point notified by the touch chip 260 or the frequency of the third signal 53 has not been switched to the working frequency point. To the operation of the capacitive active pen 10, although the reporting rate will be reduced by half. When the frequency of the third signal 53 has been switched to the operating frequency point, step 717 is performed.
  • Step 717 Send a second signal.
  • control unit 261 drives drive circuit 262 to transmit second signal 52.
  • the touch chip 260 sends a second signal 52 every cycle to notify the frequency point that the capacitive active pen 10 should currently use.
  • the capacitive touch screen 20 is prevented from corresponding to the communication frequency of the capacitive active pen 10. In this way, even if the capacitive active pen 10 used is a new pen or a newly replaced battery, the capacitive active pen 10 can ensure that the second signal 52 is received.
  • the capacitive touch screen 20 and the capacitive active pen 10 are in two-way communication with the pen control chip 11 through the touch chip 260, the capacitive active pen 10 therein
  • the pen control chip 11 performs the following steps in each cycle.
  • Step 811 Send a third signal.
  • the pen control chip 11 first transmits the third signal 53 to the capacitive touch panel 20 with the currently used frequency value. After detecting the third signal 53, the touch chip 260 calculates the current position coordinates, the pen end button and the pressure value of the pen tip of the capacitive active pen 10 by the detected signal amount.
  • Step 812 Receive a second signal. After the control unit 111 of the pen control chip 11 drives the pen tip electrode to transmit the third signal 53, the transmission signal mode is switched to the reception signal mode, and the second signal 52 sent by the touch chip 260 is detected, and the second signal is received after the detection. 52.
  • the touch chip 260 at this time should perform the frequency hopping coding mode.
  • Step 813 Verify the second signal.
  • the pen control chip 11 further demodulates the received second signal 52 by using the demodulation unit 113 to acquire the information of the working frequency point carried in the second signal 52, and verify the demodulated information. To confirm that the information received is correct.
  • Step 814 Determine whether the verification of step 813 is passed. If the verification is in error, no processing is performed, and the pen control chip 11 continues to operate using the original frequency point and waits for the start of the new cycle, that is, step 817 is performed. If the verification is correct, that is, the received information is confirmed to be correct, step 815 is performed.
  • Step 815 Determine whether the current periodic frequency point is different from the new frequency point.
  • the pen control chip 11 compares the operating frequency point included in the verified data with the frequency point used by the current period of the third signal 53, and determines whether the frequency point used in the current cycle is different from the new frequency point, that is, the working frequency point. If they are the same, no processing is performed, and the pen control chip 11 continues to work with the original frequency point and waits for the start of the new cycle, that is, step 817 is performed. If they are different, step 816 is performed.
  • Step 816 Switch to the new frequency point.
  • the pen control chip 11 switches the frequency point used by the third period of the third signal 53 to the new frequency point, that is, the operating frequency point.
  • Step 817 The new cycle begins. Restarting a new cycle, the foregoing steps 811 to 816 are sequentially performed. When the third signal 53 is transmitted in a new cycle, the frequency value of the third signal 53 will switch to the operating frequency point.
  • Capacitive touch screen and capacitive active pen are detected by a touch chip connected to a capacitive touch screen
  • the external object includes a display module, and the interference signal generated by the entire capacitive touch screen is subjected to spectrum analysis, and the frequency of the minimum intensity value of the interference signal is selected or less than one of the minimum intensity values.
  • Set the frequency of the threshold as the optimal working frequency and send the optimal working frequency to the capacitive active pen through the touch chip, and let the pen control chip connected by the capacitive active pen receive the optimal Working frequency information, and selecting the driving frequency according to the optimal operating frequency point, so as to avoid the interference signal generated by the display module, so that the use of the capacitive active pen is not affected by the strong interference signal.
  • the occurrence of jitter or spurt also avoids the touch glitch that may be caused by the interference signal with less intensity, and ensures the normal operation of the capacitive active pen by the user.
  • the use of the threshold setting avoids frequent switching between several frequency points where the interference signal strengths differ very little.

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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

L'invention concerne une puce de commande tactile (260) connectée à un écran tactile capacitif (20), l'écran tactile capacitif (20) comprenant une pluralité de canaux d'électrode d'attaque (Y), une pluralité de canaux d'électrode de détection (X) et un module d'affichage (220), et la puce de commande tactile (260) comportant une unité de commande (261), un circuit d'attaque (262), un circuit de détection (263) et une unité de multiplexage (264) qui sont connectés électriquement les uns aux autres. Après que l'unité de commande (261) a attaqué le circuit de détection (263) pour détecter un signal d'interférence provenant du module d'affichage (220) et a effectué une analyse spectrale sur le signal d'interférence de façon à sélectionner la valeur d'intensité minimale du signal d'interférence ou d'un point de fréquence, la différence entre celle-ci et la valeur d'intensité minimale étant inférieure à une valeur seuil définie, pour faire office de point de fréquence de fonctionnement, des informations sur le point de fréquence de fonctionnement sont envoyées à un stylet actif capacitif (10) appliqué sur l'écran tactile capacitif (20), et le stylet actif capacitif (10) sélectionne une fréquence d'attaque en fonction du point de fréquence de fonctionnement.
PCT/CN2017/075906 2017-03-07 2017-03-07 Puce de commande tactile, écran tactile capacitif, stylet actif capacitif et procédé de communication bidirectionnelle pour écran tactile capacitif et stylet actif capacitif Ceased WO2018161264A1 (fr)

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PCT/CN2017/075906 WO2018161264A1 (fr) 2017-03-07 2017-03-07 Puce de commande tactile, écran tactile capacitif, stylet actif capacitif et procédé de communication bidirectionnelle pour écran tactile capacitif et stylet actif capacitif
CN201780000113.3A CN109074200B (zh) 2017-03-07 2017-03-07 触控芯片、电容式触摸屏、电容式主动笔及电容式触摸屏与电容式主动笔的双向通信方法

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PCT/CN2017/075906 WO2018161264A1 (fr) 2017-03-07 2017-03-07 Puce de commande tactile, écran tactile capacitif, stylet actif capacitif et procédé de communication bidirectionnelle pour écran tactile capacitif et stylet actif capacitif

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CN117971074A (zh) * 2024-04-01 2024-05-03 深圳贝特莱电子科技股份有限公司 支持触摸和显示的主控系统、信号时序控制方法及电子烟

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