WO2024114522A1 - 一种主动电容笔的控制方法、主动电容笔 - Google Patents

一种主动电容笔的控制方法、主动电容笔 Download PDF

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Publication number
WO2024114522A1
WO2024114522A1 PCT/CN2023/133936 CN2023133936W WO2024114522A1 WO 2024114522 A1 WO2024114522 A1 WO 2024114522A1 CN 2023133936 W CN2023133936 W CN 2023133936W WO 2024114522 A1 WO2024114522 A1 WO 2024114522A1
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WO
WIPO (PCT)
Prior art keywords
active capacitive
electrode
throw switch
stylus
capacitive stylus
Prior art date
Application number
PCT/CN2023/133936
Other languages
English (en)
French (fr)
Inventor
聂宏
李志谦
Original Assignee
天津希格玛微电子技术有限公司
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 天津希格玛微电子技术有限公司 filed Critical 天津希格玛微电子技术有限公司
Publication of WO2024114522A1 publication Critical patent/WO2024114522A1/zh

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Classifications

    • 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
    • G06F3/033—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
    • G06F3/03545—Pens or stylus
    • 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
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/038—Control and interface arrangements therefor, e.g. drivers or device-embedded control circuitry
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • 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

Definitions

  • the invention belongs to the field of electronic information processing, and in particular relates to a control method of an active capacitive pen and an active capacitive pen.
  • Active capacitive pens based on the principle of capacitive screen touch control, transmit sensing signals to the capacitive screen through the components of the stylus itself, and the capacitive touch screen receives these signals and calculates the location to achieve the purpose of touch sensing. More advanced active capacitive pens also achieve the real handwriting function by adding various sensors, such as pressure sensors. In addition to receiving the sensing signals emitted by the active capacitive pen, the capacitive touch screen must also complete other functions such as screen display and support multiple capacitive pens to work simultaneously. Therefore, the capacitive touch screen and the active capacitive pen must be precisely synchronized in time, so that the stylus will only emit sensing signals when the capacitive touch screen is in a receiving state.
  • the method of the prior art is to periodically transmit an uplink signal through the capacitive touch screen, and after receiving the uplink signal, the active capacitive pen transmits the sensing signal in the specified time slot according to the time information and control command provided by the uplink signal. It can be seen that the active capacitive pen can only effectively complete the information interaction with the capacitive touch screen if it can accurately receive the uplink signal emitted by the capacitive touch screen.
  • LD is the uplink signal transmitting device of the capacitive touch screen.
  • the uplink signal transmitted by LD is received by RING (channel one) and TIP (channel two) through capacitor (C1 and C3) coupling, and then sent to the analog front-end amplifier (AFE) through the channel selection switch.
  • AFE analog front-end amplifier
  • the capacitive screen stylus arranges an isolated ground wire between channel one and channel two. Therefore, the isolated ground wire generates the capacitance C2 from channel one to the ground and the capacitance C4 from channel two to the ground shown in Figure 2.
  • the capacitive screen stylus When the capacitive screen stylus is in the receiving mode, the capacitive screen stylus mainly has three ways to receive the uplink signal:
  • the active capacitive stylus only receives the uplink signal through channel 1, that is, only the uplink signal received by channel 1 is sent to the analog front-end amplifier (AFE) through the channel selection switch.
  • AFE analog front-end amplifier
  • the uplink signal is only received through channel 2, that is, only the uplink signal received by channel 2 is sent to the analog front-end amplifier (AFE) through the channel selection switch.
  • AFE analog front-end amplifier
  • the uplink signal is received through channel 1 and channel 2 at the same time, that is, the uplink signals received by channel 1 and channel 2 are superimposed together through the channel selection switch and sent to the analog front-end amplifier (AFE).
  • AFE analog front-end amplifier
  • the present invention provides the following solutions:
  • the present invention provides a control method for an active capacitive stylus, comprising:
  • An isolation ground line is arranged between a first electrode RING and a second electrode TIP of the active capacitive stylus;
  • a single-pole single-throw switch S1 is connected between the isolated ground wire and the system ground wire;
  • the single-pole single-throw switch S1 When the active capacitive stylus is in a signal sending mode, the single-pole single-throw switch S1 is closed;
  • the single-pole single-throw switch S1 is disconnected.
  • the present invention provides a control method for an active capacitive stylus, wherein the first electrode RING and the second electrode TIP are respectively connected to an analog front-end amplifier through a channel selection switch;
  • a single-pole single-throw switch S2 is also connected between the isolated ground wire and the channel selection switch;
  • the single-pole single-throw switch S1 When the active capacitive stylus pen is in a signal sending mode, the single-pole single-throw switch S1 is closed and the single-pole single-throw switch S2 is opened;
  • the single-pole single-throw switch S1 When the active capacitive stylus pen is in a signal receiving mode, the single-pole single-throw switch S1 is opened and the single-pole single-throw switch S2 is closed.
  • the present invention provides a control method for an active capacitive pen, wherein the active capacitive pen communicates with a capacitive touch screen via the isolated ground line.
  • the present invention provides a control method for an active capacitive stylus, the method selecting any one or both of a mechanical switch, an electronic switch implemented by separate electronic components, or an electronic switch implemented by an integrated circuit as the single-pole single-throw switch S1 or the single-pole single-throw switch S2.
  • the present invention provides a control method for an active capacitive stylus, wherein the method is used to receive an uplink signal only through the first electrode RING, that is, only the uplink signal received by channel 1 is sent to an analog front-end amplifier (AFE) through a channel selection switch.
  • AFE analog front-end amplifier
  • the amplitude of the input signal of the analog front-end amplifier is mainly determined by:
  • C1 is the coupling capacitor between the first electrode and the capacitive touch screen
  • C5 is the coupling capacitor formed between all devices before the analog front-end amplifier of the active capacitive stylus and the ground.
  • the present invention provides a control method for an active capacitive stylus, wherein the method is used to receive an uplink signal only through the second electrode TIP, that is, only the uplink signal received by channel 2 is sent to the analog front-end amplifier through the channel selection switch.
  • the amplitude of the input signal of the analog front-end amplifier is mainly determined by:
  • C3 is the coupling capacitor between the second electrode and the capacitive touch screen
  • C5 is the coupling capacitor formed between all devices before the analog front-end amplifier of the active capacitive stylus and the ground.
  • the present invention provides a control method for an active capacitive stylus, wherein the method is used to simultaneously receive an uplink signal through the first electrode RING and the second electrode TIP, that is, the uplink signals received by channel 1 and channel 2 are simultaneously sent to an analog front-end amplifier through a channel selection switch.
  • the amplitude of the input signal of the analog front-end amplifier is mainly determined by:
  • C1 is the coupling capacitor between the first electrode and the capacitive touch screen
  • C3 is the coupling capacitor between the second electrode and the capacitive touch screen
  • C5 is the coupling capacitor formed between all devices before the analog front-end amplifier of the active capacitive pen and the ground.
  • the present invention provides an active capacitive stylus for active capacitive touch control, the active capacitive stylus comprising:
  • the first electrode and the second electrode are used for communicating with the capacitive touch screen
  • An isolated ground line is arranged between the first electrode and the second electrode of the active capacitive stylus
  • a single-pole single-throw switch S1 is used to connect the isolated ground wire and the system ground wire;
  • the single-pole single-throw switch S1 When the active capacitive stylus is in a signal sending mode, the single-pole single-throw switch S1 is closed;
  • the single-pole single-throw switch S1 is disconnected.
  • the present invention provides an active capacitive stylus for active capacitive touch control, wherein the active capacitive stylus at least further comprises:
  • a channel selection switch used to connect the first electrode and the second electrode to an analog front-end amplifier respectively
  • a single-pole single-throw switch S2 connecting the isolated ground wire and the channel selection switch;
  • the single-pole single-throw switch S1 When the active capacitive stylus pen is in a signal sending mode, the single-pole single-throw switch S1 is closed and the single-pole single-throw switch S2 is opened;
  • the single-pole single-throw switch S1 When the active capacitive stylus pen is in a signal receiving mode, the single-pole single-throw switch S1 is opened and the single-pole single-throw switch S2 is closed.
  • the present invention provides an active capacitive stylus for active capacitive touch, wherein the active capacitive stylus communicates with the capacitive touch screen via the isolated ground line.
  • the present invention provides an active capacitive touch pen, wherein the single-pole single-throw switch S1 or the single-pole single-throw switch S2 is implemented by any one or both of a mechanical switch, an electronic switch implemented by separate electronic components, or an electronic switch implemented by an integrated circuit.
  • the present invention provides an active capacitive touch pen, which receives an uplink signal only through the first electrode, that is, only sends the uplink signal received by channel 1 to an analog front-end amplifier (AFE) through a channel selection switch.
  • AFE analog front-end amplifier
  • the amplitude of the input signal of the analog front-end amplifier is mainly determined by:
  • the coupling capacitance between the first electrode and the capacitive touch screen is C1
  • the coupling capacitance formed between all devices before the analog front-end amplifier of the active capacitive stylus and the ground is C5.
  • the present invention provides an active capacitive touch pen, which receives the uplink signal only through the second electrode, that is, only sends the uplink signal received by channel 2 to the analog front-end amplifier through the channel selection switch.
  • the amplitude of the input signal of the analog front-end amplifier is mainly determined by:
  • the coupling capacitance between the second electrode and the capacitive touch screen is C3
  • the coupling capacitance formed between all devices before the analog front-end amplifier of the active capacitive stylus and the ground is C5.
  • the present invention provides an active capacitive touch pen, which simultaneously receives an uplink signal through a first electrode and a second electrode, that is, simultaneously sends the uplink signals received by channel one and channel two to an analog front-end amplifier through a channel selection switch.
  • the amplitude of the input signal of the analog front-end amplifier is mainly determined by:
  • the coupling capacitance between the first electrode and the capacitive touch screen is C1
  • the coupling capacitance between the second electrode and the capacitive touch screen is C3
  • the coupling capacitance formed between all devices before the analog front-end amplifier of the active capacitive pen and the ground is C5.
  • the present invention provides a control method and an active capacitive pen, wherein an isolated ground wire is arranged between the first electrode and the second electrode of the active capacitive pen; a single-pole single-throw switch S1 is connected between the isolated ground wire and the system ground wire; when the active capacitive pen is in a signal sending mode, the single-pole single-throw switch S1 is closed to connect the isolated ground wire and the system ground wire together, and a downlink high-voltage signal is sent through the first electrode and the second electrode; when in a signal receiving mode, the single-pole single-throw switch S1 is disconnected to put the isolated ground wire in a high-impedance state.
  • the capacitance from channel one to the ground and the capacitance from channel two to the ground are eliminated.
  • the parasitic capacitance between the first electrode, the second electrode and the isolated ground wire can be eliminated, and the amplitude and signal-to-noise ratio of the uplink signal received by the active capacitive pen can be effectively improved, thereby greatly improving the clock synchronization accuracy and data reception accuracy of the active capacitive pen and the capacitive touch screen under various working conditions.
  • first electrode and the second electrode are connected to the analog front-end amplifier through a channel selection switch respectively; a single-pole single-throw switch S2 is also connected between the isolated ground wire and the channel selection switch; when the active capacitive pen is in a signal transmission mode, the single-pole single-throw switch S1 is closed and the single-pole single-throw switch S2 is disconnected to realize the function of isolating the downlink high-voltage signal sent by channel one and channel two through the ground wire; when the active capacitive pen is in a signal receiving mode, the single-pole single-throw switch S1 is disconnected and the single-pole single-throw switch S2 is closed.
  • LD is the uplink signal transmitting device of the capacitive touch screen, and the uplink signal transmitted by LD will be received by the isolated ground wire through capacitive coupling, and then superimposed with the uplink signals received by other channels through the channel selection switch and sent to the analog front-end amplifier (AFE).
  • AFE analog front-end amplifier
  • the active capacitive pen and the capacitive touch screen can also communicate through the isolated ground line, and the structure of the active capacitive pen is fully utilized to expand the communication channel of the active capacitive pen so that the two-channel active capacitive pen is expanded to a three-channel active capacitive pen.
  • the existing technology it has outstanding substantial characteristics and significant progress.
  • FIG1 is a diagram showing the external structure of an active capacitive stylus in the prior art
  • FIG2 is a schematic diagram of a circuit model of an active capacitive stylus in the prior art
  • FIG3 is a schematic diagram of a dual-channel circuit model of an active capacitive stylus according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a three-channel circuit model of an active capacitive stylus according to yet another embodiment of the present invention.
  • A/B can mean A or B.
  • the “and/or” in this article is merely a way to describe the association relationship of associated objects, indicating that three relationships can exist.
  • a and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone.
  • first”, “second”, etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as “first”, “second”, etc. may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.
  • the exemplary embodiments of the present disclosure provide a control method for an active capacitive stylus.
  • the signal of the stylus tip of the active capacitive touch screen is redesigned.
  • the transmitting circuit model inserts at least one single-pole single-throw switch between the system ground and the isolated ground (i.e., one end of the parasitic capacitance between the channel and the ground).
  • the isolated ground and the system ground are short-circuited to isolate the downlink high-voltage signal between the channels.
  • the isolated ground and the system ground are disconnected to put the isolated ground in a high-resistance state, thereby eliminating the parasitic capacitance from the channel to the ground and improving the sensitivity of the active capacitive stylus.
  • the active capacitive stylus and the capacitive touch screen can also communicate through the isolated ground, making full use of the structure of the active capacitive stylus to expand the communication channel of the active capacitive stylus so that the two-channel active capacitive stylus is expanded to a three-channel active capacitive stylus, which has outstanding substantive characteristics and significant progress compared to the prior art.
  • FIG. 1 schematically shows a diagram of the external structure relationship of an active capacitive pen in the prior art, which is similar to the arrangement relationship of the external structure of the active capacitive pen in the exemplary implementation of the present disclosure.
  • the present invention relates to an active capacitive pen, comprising a pen holder, a pen tip, and an inner core, wherein the pen tip is arranged at one end of the pen holder, the inner core is installed in the pen holder, the inner core comprises a first electrode RING, a second electrode TIP, and an isolated ground wire, the second electrode is columnar, the first electrode surrounds the second electrode, wraps at least part of the first electrode, and an isolated ground wire is arranged between the first electrode and the second electrode.
  • the pen tip comprises a channel one (RING) and a channel two (TIP), an isolated ground wire is arranged between the channel one and the channel two; the channel one is carried by the first electrode, and the channel two is carried by the second electrode.
  • the first electrode, the second electrode and the isolated ground line are arranged at one end of the capacitive pen along the longitudinal direction, and can generate coupling capacitance with the capacitive touch screen to realize communication between the active capacitive pen and the capacitive touch screen, with flexible structure, resource saving, flexible operation and easy use.
  • FIG3 shows a schematic diagram of an example of an uplink signal receiving circuit model according to an embodiment of the present disclosure. It should be noted that FIG3 is a schematic diagram of the structure of the hardware operating environment of the control method of the active capacitive pen.
  • the device based on the control method of the active capacitive pen in the embodiment of the present invention may be a capacitive screen stylus.
  • the active capacitive pen structure of the active capacitive touch shown in FIG3 does not constitute a limitation on the active capacitive pen of the active capacitive touch, and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.
  • the present invention provides a control method for an active capacitive pen, comprising: arranging an isolated ground wire between a first electrode and a second electrode of the active capacitive pen; connecting a single-pole single-throw switch S1 between the isolated ground wire and the system ground wire; when the active capacitive pen is in a signal sending mode, closing the single-pole single-throw switch S1; when the active capacitive pen is in a signal receiving mode, disconnecting the single-pole single-throw switch S1.
  • the present invention provides a control method for an active capacitive pen, comprising: connecting a single-pole single-throw switch S1 between the isolated ground wire and the system ground wire; when the switch S1 is closed, the capacitive screen stylus is in a signal sending mode, and when the switch S1 is disconnected, the capacitive screen stylus is in a signal receiving mode.
  • the present invention provides a control method for an active capacitive stylus, wherein the first electrode and the second electrode are connected to an analog front-end amplifier through a channel selection switch; a ground line is further connected between the isolation ground line and the channel selection switch.
  • the method provided by the present invention also includes providing a single-pole single-throw switch S2 between the isolation ground wire and the channel selection switch; when S1 is closed and S2 is disconnected, the capacitive screen stylus is in the signal sending mode; when S1 is disconnected and S2 is closed, the capacitive screen stylus is in the signal receiving mode.
  • the present invention provides a control method for an active capacitive stylus, wherein the active capacitive stylus communicates with a capacitive touch screen via the isolated ground line.
  • the present invention provides a control method for an active capacitive pen, wherein the method selects any one or a combination of a mechanical switch, an electronic switch implemented by separate electronic components, or an electronic switch implemented by an integrated circuit as the single-pole single-throw switch S1 or the single-pole single-throw switch S2.
  • the control method of active capacitive pen of the present invention is by setting a switch S1 of single-pole single-throw between isolated ground wire and system ground wire, when capacitive screen touch pen is in receiving mode, the isolated ground wire is disconnected from the system ground wire, so that the isolated ground wire is in high-impedance state, thereby eliminating the capacitance of channel one to ground and the capacitance of channel two to ground.
  • a switch S2 of single-pole single-throw can also be set between the isolated ground wire and the channel selection switch, so that the uplink signal emitted by LD can be received by the isolated ground wire through capacitive coupling, and then the uplink signal received by the channel selection switch and other channels is superimposed together and sent to analog front-end amplifier (AFE).
  • AFE analog front-end amplifier
  • connection can not only eliminate the capacitance of channel one to ground and the capacitance of channel two to ground, but also further increase the signal amplitude received by capacitive screen touch pen, and improve the clock synchronization accuracy and data reception accuracy of active capacitive pen with capacitive touch screen under various working states.
  • the present invention provides a control method for an active capacitive stylus, wherein the method is used to receive an uplink signal only through the first electrode, that is, only the uplink signal received by channel 1 is sent to an analog front-end amplifier (AFE) through a channel selection switch.
  • AFE analog front-end amplifier
  • the amplitude of the input signal of the analog front-end amplifier is mainly determined by:
  • the coupling capacitor between the first electrode and the capacitive touch screen is C1
  • the coupling capacitor formed between all devices before the analog front-end amplifier of the active capacitive pen and the ground is C5, which improves the sensitivity of the active capacitive pen.
  • the present invention provides a control method for an active capacitive stylus, wherein the method is used to receive an uplink signal only through the second electrode, that is, only the uplink signal received by channel 2 is sent to an analog front-end amplifier through a channel selection switch.
  • the amplitude of the input signal of the analog front-end amplifier is mainly determined by:
  • the coupling capacitor between the second electrode and the capacitive touch screen is C3
  • the coupling capacitor formed between all devices before the analog front-end amplifier of the active capacitive pen and the ground is C5, which improves the sensitivity of the active capacitive pen.
  • the present invention provides a control method for an active capacitive stylus, wherein the method is used to simultaneously receive an uplink signal through a first electrode and a second electrode, that is, the uplink signals received by channel one and channel two are simultaneously sent to an analog front-end amplifier through a channel selection switch.
  • the amplitude of the input signal of the analog front-end amplifier is mainly determined by:
  • the coupling capacitor between the first electrode and the capacitive touch screen is C1
  • the coupling capacitor between the second electrode and the capacitive touch screen is C3
  • the coupling capacitor formed between all devices before the analog front-end amplifier of the active capacitive pen and the ground is C5, which improves the sensitivity of the active capacitive pen.
  • the present invention further provides an active capacitive stylus for active capacitive touch control.
  • the present invention provides an active capacitive stylus for active capacitive touch control, and the active capacitive stylus includes:
  • the first electrode and the second electrode are used for communicating with the capacitive touch screen
  • An isolated ground line is arranged between the first electrode and the second electrode of the active capacitive stylus
  • a single-pole single-throw switch S1 is used to connect the isolated ground wire and the system ground wire;
  • the single-pole single-throw switch S1 When the active capacitive stylus is in a signal sending mode, the single-pole single-throw switch S1 is closed;
  • the single-pole single-throw switch S1 is disconnected.
  • the present invention provides an active capacitive stylus for active capacitive touch control, wherein the active capacitive stylus at least includes:
  • a channel selection switch used to connect the first electrode and the second electrode to an analog front-end amplifier respectively
  • a single-pole single-throw switch S2 connecting the isolated ground wire and the channel selection switch;
  • the single-pole single-throw switch S1 When the active capacitive stylus pen is in a signal sending mode, the single-pole single-throw switch S1 is closed and the single-pole single-throw switch S2 is opened;
  • the single-pole single-throw switch S1 When the active capacitive stylus is in the signal receiving mode, the single-pole single-throw switch S1 is disconnected and the single-pole single-throw switch S2 is closed.
  • the structure of the active capacitive stylus for active capacitive touch control shown in FIG4 does not constitute a limitation on the active capacitive stylus for active capacitive touch control, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.
  • the capacitive screen stylus When S1 is closed and S2 is open, the capacitive screen stylus is in signal sending mode; when S1 is open and S2 is closed, the capacitive screen stylus is in signal receiving mode. Similarly, the parasitic capacitance from channel 1 and channel 2 to the ground is eliminated.
  • the uplink signal emitted by LD is received by the isolated ground wire through capacitive coupling, and then connected to other channels through the channel selection switch.
  • the received uplink signals are superimposed together and sent to the analog front-end amplifier (AFE), which can further increase the signal amplitude received by the capacitive screen stylus.
  • AFE analog front-end amplifier
  • the present invention provides an active capacitive stylus for active capacitive touch, and the active capacitive stylus communicates with the capacitive touch screen through the isolated ground line.
  • the present invention provides an active capacitive touch pen
  • the single-pole single-throw switch S1 or the single-pole single-throw switch S2 is generated by any one or more combinations of mechanical switches, electronic switches realized by separating electronic components, or electronic switches realized by integrated circuits.
  • switches S1 and S2 can be electronic switches, that is, when the capacitive screen stylus is powered on, the program in the firmware is automatically run to perform the on-off operation of the above switches S1 and S2; of course, switches S1 and S2 can also be analog switches, and the on-off operation of the switches can be performed by buttons set on the housing of the capacitive screen stylus.
  • the present invention provides an active capacitive touch pen
  • the uplink signal is only received through the first electrode, that is, only the uplink signal received by channel 1 is sent to the analog front-end amplifier (AFE) through the channel selection switch.
  • AFE analog front-end amplifier
  • the amplitude of the input signal of the analog front-end amplifier is mainly determined by:
  • the coupling capacitance between the first electrode and the capacitive touch screen is C1
  • the coupling capacitance formed between all devices before the analog front-end amplifier of the active capacitive stylus and the ground is C5.
  • the present invention provides an active capacitive touch pen
  • the uplink signal is only received through the second electrode, that is, only the uplink signal received by channel 2 is sent to the analog front-end amplifier through the channel selection switch.
  • the amplitude of the input signal of the analog front-end amplifier is mainly determined by:
  • the coupling capacitance between the second electrode and the capacitive touch screen is C3
  • the coupling capacitance formed between all devices before the analog front-end amplifier of the active capacitive stylus and the ground is C5.
  • the present invention provides an active capacitive touch pen
  • the uplink signal is received through the first electrode and the second electrode at the same time, that is, the uplink signals received by channel 1 and channel 2 are sent to the analog front-end amplifier through the channel selection switch.
  • the amplitude of the input signal of the analog front-end amplifier is mainly determined by:
  • the coupling capacitance between the first electrode and the capacitive touch screen is C1
  • the coupling capacitance between the second electrode and the capacitive touch screen is C3
  • the coupling capacitance formed between all devices before the analog front-end amplifier of the active capacitive pen and the ground is C5.
  • embodiments of the present invention may be provided as methods, systems or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and/or one or more boxes in the block diagram.
  • Computer-readable media include permanent and non-permanent, removable and non-removable media that can be used to store information by any method or technology.
  • Information can be computer-readable instructions, data structures, modules of programs, or other data.
  • Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, read-only compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device.
  • PRAM phase change memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • RAM random access memory
  • ROM read-only memory
  • EEPROM electrically erasable programmable read-only memory

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Abstract

本发明提供了一种主动电容笔的控制方法、主动电容笔，包括：在主动电容笔的第一电极和第二电极之间排布隔离地线；在隔离地线和系统地线之间连接有一个单刀单掷开关S1；当主动电容笔处于信号发送模式时，闭合单刀单掷开关S1，将隔离地线和系统地线连接在一起，通过第一电极和第二电极发送下行高压信号；当处于信号接收模式时，断开单刀单掷开关S1，使隔离地线处于高阻状态。从而消除了通道一到地的电容和通道二到地的电容。利用上述方法，能够消除第一电极和第二电极与隔离地线之间的寄生电容，有效提高主动电容笔接收到的上行信号的幅度和信噪比，从而大幅提高主动电容笔在各种工作状态下与电容触控屏的时钟同步精度和数据接收准确率。

Description

一种主动电容笔的控制方法、主动电容笔
本申请要求于2022年11月29日提交的、申请号为CN 202211507925.6、标题为“一种主动电容笔的控制方法、主动电容笔”的中国专利申请的优先权，该中国专利申请的公开内容以引用的方式并入本文。
技术领域
本发明属于电子信息处理领域，具体涉及一种主动电容笔的控制方法、主动电容笔。
背景技术
本部分旨在为权利要求书中陈述的本发明的实施例提供背景或上下文。此处的描述不因为包括在本部分中就承认是现有技术。
主动电容笔，是在电容屏触控原理上，通过触控笔自身带的元器件给电容屏发射感应信号，电容触控屏通过接收这些信号，计算定位来实现触控感应的目的。更高端的主动电容笔还通过加入各种感应器，例如压力感应器等，来实现真实笔迹功能。电容触控屏除了要接收主动电容笔发射的感应信号外，还要完成屏幕显示、支持多个电容笔同时工作等其它功能。因此，电容触控屏和主动电容笔要在时间上达到精准同步，实现只有电容触控屏处于接收状态时，触控笔才会发射感应信号。为了实现这一时间同步，现有技术的方法是通过电容触控屏定期发射上行信号，主动电容笔在接收到上行信号后，按上行信号提供的时间信息和控制命令在指定的时隙发射感应信号。由此可见，主动电容笔只有能够准确接收到电容触控屏发射的上行信号，才能有效完成与电容触控屏的信息交互。
现有技术的主动电容笔在接收或发送上行信号时，其常用接收电路可用如图1、图2所示的电路模型近似表示。其中LD是电容触控屏的上行信号发射装置。LD发射的上行信号通过电容(C1和C3)耦合被RING(通道一)和TIP(通道二)接收，再经过通道选择开关送到模拟前端放大器(AFE)。由于主动电容笔处于发送模式时，电容屏触控笔需要通过通道一和通道二同时发送两路不同的下行高压信号。为了隔离这两路下行高压信号，电容屏触控笔在通道一和通道二之间排布了隔离地线。因此，所述隔离地线产生了图2所示的通道一到地的电容C2和通道二到地的电容C4。当电容屏触控笔处于接收模式时，电容屏触控笔主要有三种方式接收上行信号：
主动电容笔只通过通道一接收上行信号，即只将通道一接收到的上行信号经过通道选择开关送到模拟前端放大器(AFE)。此时，上行信号的增益主要决定于：
K1＝C1/(C1+C2+C5)   (1)，
只通过通道二接收上行信号，即只将通道二接收到的上行信号经过通道选择开关送到模拟前端放大器(AFE)。此时，上行信号的增益主要决定于：
K2＝C3/(C3+C4+C5)   (2)，
同时通过通道一和通道二接收上行信号，即将通道一和通道二接收到的上行信号经过通道选择开关叠加在一起送到模拟前端放大器(AFE)。此时，上行信号的增益主要决定于：
K3＝(C1+C3)/(C1+C3+C2+C4+C5)   (3)，
从公式(1)至(3)可以看出，无论电容屏触控笔采用哪一种方式接收上行信号，上行信号的接收幅度都会因为C2和C4的存在而降低。
因此，如何去除C2和C4的的影响，有效提高主动电容笔接收到的上行信号的幅度和信噪比，从而提高主动电容笔在各种工作状态下的与电容触控屏的时钟同步精度和数据接收准确率是一个亟待解决的问题。此外，现有技术中，主动电容笔仅有两通道的通信信道，并不存在通过隔离地线实现与电容触控屏通信的情况，如何充分利用主动电容笔的结构扩展主动电容笔的通信信道成为另一个亟待解决的问题。
发明内容
针对上述现有技术中存在的问题，提出了一种主动电容笔的控制方法、主动电容笔及电容屏触控笔，利用这种方法、主动电容笔，能够解决上述问题。
本发明提供了以下方案：
可选地，本发明提供了一种主动电容笔的控制方法，包括：
在主动电容笔的第一电极RING和第二电极TIP之间排布隔离地线；
在隔离地线和系统地线之间连接有一个单刀单掷开关S1；
当所述主动电容笔处于信号发送模式时，闭合所述单刀单掷开关S1；
当所述主动电容笔处于信号接收模式时，断开所述单刀单掷开关S1。
可选地，本发明提供了一种主动电容笔的控制方法，所述第一电极RING和所述第二电极TIP分别通过通道选择开关连接模拟前端放大器；
在隔离地线和通道选择开关之间还连接有单刀单掷开关S2；
当所述主动电容笔处于信号发送模式时，闭合所述单刀单掷开关S1、断开所述单刀单掷开关S2；
当所述主动电容笔处于信号接收模式时，断开所述单刀单掷开关S1、闭合单刀单掷开关S2。
可选地，本发明提供了一种主动电容笔的控制方法，所述主动电容笔通过所述隔离地线实现与电容触控屏通信。
可选地，本发明提供了一种主动电容笔的控制方法，所述方法选择机械开关、通过分离电子元器件实现的电子开关或者通过集成电路实现的电子开关中任意一种或两种作为所述单刀单掷开关S1或所述单刀单掷开关S2。
可选地，本发明提供了一种主动电容笔的控制方法，使用所述方法仅通过第一电极RING接收上行信号，即只将通道一接收到的上行信号经过通道选择开关送到模拟前端放大器(AFE)，此时，模拟前端放大器的输入信号幅度的大小主要决定于：
其中，C1为所述第一电极与电容触控屏之间的耦合电容，C5为主动电容笔的模拟前端放大器之前的所有器件与地之间形成的耦合电容。
可选地，本发明提供了一种主动电容笔的控制方法，使用所述方法仅通过第二电极TIP接收上行信号，即只将通道二接收到的上行信号经过通道选择开关送到模拟前端放大器，此时，模拟前端放大器的输入信号幅度的大小主要决定于：
其中，C3为所述第二电极与电容触控屏之间的耦合电容，C5为主动电容笔的模拟前端放大器之前的所有器件与地之间形成的耦合电容。
可选地，本发明提供了一种主动电容笔的控制方法，使用所述方法同时通过第一电极RING和第二电极TIP接收上行信号，即同时将通道一和通道二接收到的上行信号经过通道选择开关送到模拟前端放大器，此时，模拟前端放大器的输入信号幅度的大小主要决定于：
其中，C1为所述第一电极与电容触控屏之间的耦合电容，C3为所述第二电极与所述电容触控屏之间的耦合电容，C5为主动电容笔的模拟前端放大器之前的所有器件与地之间形成的耦合电容。
可选地，本发明提供了一种主动电容触控的主动电容笔，所述主动电容笔包括：
第一电极和第二电极，用于与电容触控屏之间通信；
隔离地线，排布于主动电容笔的第一电极和第二电极之间；
单刀单掷开关S1，连接所述隔离地线和系统地线；
当所述主动电容笔处于信号发送模式时，闭合所述单刀单掷开关S1；
当所述主动电容笔处于信号接收模式时，断开所述单刀单掷开关S1。
可选地，本发明提供了一种主动电容触控的主动电容笔，所述主动电容笔至少还包括：
通道选择开关，用于将所述第一电极和所述第二电极分别连接模拟前端放大器；
单刀单掷开关S2，连接所述隔离地线和所述通道选择开关；
当所述主动电容笔处于信号发送模式时，闭合所述单刀单掷开关S1、断开所述单刀单掷开关S2；
当所述主动电容笔处于信号接收模式时，断开所述单刀单掷开关S1、闭合单刀单掷开关S2。
可选地，本发明提供了一种主动电容触控的主动电容笔，所述主动电容笔通过所述隔离地线实现与电容触控屏通信。
可选地，本发明提供了一种主动电容触控的主动电容笔，所述单刀单掷开关S1或所述单刀单掷开关S2通过机械开关、通过分离电子元器件实现的电子开关或者通过集成电路实现的电子开关中任意一种或两种实现。
可选地，本发明提供了一种主动电容触控的主动电容笔，仅通过第一电极接收上行信号，即只将通道一接收到的上行信号经过通道选择开关送到模拟前端放大器(AFE)，此时，模拟前端放大器的输入信号幅度的大小主要决定于：
其中，所述第一电极与电容触控屏之间的耦合电容为C1，主动电容笔的模拟前端放大器之前的所有器件与地之间形成的耦合电容为C5。
可选地，本发明提供了一种主动电容触控的主动电容笔，仅通过第二电极接收上行信号，即只将通道二接收到的上行信号经过通道选择开关送到模拟前端放大器，此时，模拟前端放大器的输入信号幅度的大小主要决定于：
其中，所述第二电极与电容触控屏之间的耦合电容为C3，主动电容笔的模拟前端放大器之前的所有器件与地之间形成的耦合电容为C5。
可选地，本发明提供了一种主动电容触控的主动电容笔，同时通过第一电极和第二电极接收上行信号，即同时将通道一和通道二接收到的上行信号经过通道选择开关送到模拟前端放大器，此时，模拟前端放大器的输入信号幅度的大小主要决定于：
其中，所述第一电极与电容触控屏之间的耦合电容为C1，所述第二电极与所述电容触控屏之间的耦合电容为C3，主动电容笔的模拟前端放大器之前的所有器件与地之间形成的耦合电容为C5。
本发明的有益效果，本发明提供了一种主动电容笔的控制方法、主动电容笔，在主动电容笔的第一电极和第二电极之间排布隔离地线；在隔离地线和系统地线之间连接有一个单刀单掷开关S1；当主动电容笔处于信号发送模式时，闭合单刀单掷开关S1，将隔离地线和系统地线连接在一起，通过第一电极和第二电极发送下行高压信号；当处于信号接收模式时，断开单刀单掷开关S1，使隔离地线处于高阻状态。从而消除了通道一到地的电容和通道二到地的电容。利用上述方法，能够消除第一电极和第二电极与隔离地线之间的寄生电容，有效提高主动电容笔接收到的上行信号的幅度和信噪比，从而大幅提高主动电容笔在各种工作状态下与电容触控屏的时钟同步精度和数据接收准确率。更进一步地，所述第一电极和所述第二电极分别通过通道选择开关连接模拟前端放大器；在隔离地线和通道选择开关之间还连接有单刀单掷开关S2；当所述主动电容笔处于信号发送模式时，闭合所述单刀单掷开关S1、断开所述单刀单掷开关S2，实现通过地线隔离通道一和通道二发送的下行高压信号的功能；当所述主动电容笔处于信号接收模式时，断开所述单刀单掷开关S1、闭合单刀单掷开关S2。这时，LD是电容触控屏的上行信号发射装置，LD发射的上行信号会通过电容耦合被隔离地线接收，再经过通道选择开关与其它通道接收到的上行信号叠加在一起送到模拟前端放大器(AFE)。这样的连接不仅能消除通道一到地的电容和通道二到地的电容，还能进一步增加电容屏触控笔接收到的信号幅度。有效提高主动电容笔接收到的上行信号的幅度和信噪比，从而大幅提高主动电容笔在各种工作状态下的与电容触控屏的时钟同步精度和数据接收准确率。还通过隔离地线实现了主动电容笔与电容触控屏通信，充分利用主动电容笔的结构扩展主动电容笔的通信信道使两信道的主动电容笔扩展为三信道的主动电容笔，相对于现有技术具有突出的实质性特点和显著的进步。
应当理解，上述说明仅是本发明技术方案的概述，以便能够更清楚地了解本发明的技术手段，从而可依照说明书的内容予以实施。为了让本发明的上述和其它目的、特征和优点能够更明显易懂，以下特举例说明本发明的具体实施例。
附图说明
通过阅读下文的示例性实施例的详细描述，本领域普通技术人员将明白本文所述的优点和益处以及其他优点和益处。附图仅用于示出示例性实施例的目的，而并不认为是对本发明的限制。而且在整个附图中，用相同的标号表示相同的部件。在附图中：
图1为现有技术中主动电容笔外部结构关系图；
图2为现有技术中主动电容笔的电路模型示意图；
图3为根据本发明一实施例的主动电容笔的双通道电路模型示意图；
图4为根据本发明又一实施例的主动电容笔的三通道电路模型示意图。
具体实施例
下面将参照附图更详细地描述本公开的示例性实施例。虽然附图中显示了本公开的示例性实施例，然而应当理解，可以以各种形式实现本公开而不应被这里阐述的实施例所限制。相反，提供这些实施例是为了能够更透彻地理解本公开，并且能够将本公开的范围完整的传达给本领域的技术人员。
在本申请实施例的描述中，应理解，诸如“包括”或“具有”等术语旨在指示本说明书中所公开的特征、数字、步骤、行为、部件、部分或其组合的存在，并且不旨在排除一个或多个其他特征、数字、步骤、行为、部件、部分或其组合存在的可能性。
除非另有说明，“/”表示或的意思，例如，A/B可以表示A或B；本文中的“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。
术语“第一”、“第二”等仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”等的特征可以明示或者隐含地包括一个或者更多个该特征。在本申请实施例的描述中，除非另有说明，“多个”的含义是两个或两个以上。
本申请中的所有代码都是示例性的，本领域技术人员根据所使用的编程语言，具体的需求和个人习惯等因素会在不脱离本申请的思想的条件下想到各种变型。
如上所述，传统方案的主动电容笔在接收上行信号时，因通道之间有系统地线的存在，产生了两个通道到地的寄生电容，由于上述寄生电容的存在，导致上行信号的接收幅度降低，影响电容屏触控笔的操作过程中的数据接收准确率。
为了至少部分地解决上述问题以及其他潜在问题中的一个或者多个，本公开的示例实施例提出了一种主动电容笔的控制方法。在该方法中，重新设计主动电容触控屏的笔头的信号 发送电路模型，在系统地线与隔离地线(即通道与地线之间存在的寄生电容的一端)插入至少一个单刀单掷的开关。当电容屏触控笔处于发送模式时，将隔离地线与系统地线短路，隔离通道之间的下行高压信号，当电容屏触控笔处于接收模式时，将隔离地线与系统地线断开，使隔离地线处于高阻状态，从而消除通道到地的寄生电容，提高了主动电容笔的灵敏度。还通过隔离地线实现了主动电容笔与电容触控屏通信，充分利用主动电容笔的结构扩展主动电容笔的通信信道使两信道的主动电容笔扩展为三信道的主动电容笔，相对于现有技术具有突出的实质性特点和显著的进步。
首先参见图1，其示意性示出了现有技术中主动电容笔外部结构关系图，其与本公开的示例性实现方式的主动电容笔外部结构的排列关系相似。本发明涉及一种主动电容笔，包括笔杆、笔头、内芯，所述笔头设于笔杆一端，所述内芯安装于笔杆内，所述内芯包括第一电极RING、第二电极TIP和隔离地线，所述第二电极呈柱状，所述第一电极环绕所述第二电极，将所述第一电极的至少部分包裹住，在第一电极和第二电极之间排布隔离地线。笔头，所述笔头包括通道一(RING)和通道二(TIP)，所述通道一和所述通道二之间有隔离地线；所述通道一由第一电极承载，所述通道二由第二电极承载。
所述第一电极、所述第二电极和所述隔离地线沿纵向方向设置在电容笔的一端，且均能与电容触控屏之间产生耦合电容，实现主动电容笔与电容触控屏的通信，结构灵活，节约资源，操作灵活，使用方便。
图3示出了根据本公开的实施例的上行信号接收电路模型的示例的示意图。需要说明的是，图3即主动电容笔的控制方法的硬件运行环境的结构示意图。本发明实施例基于主动电容笔的控制方法的设备可以是电容屏触控笔。本领域技术人员可以理解，图3中示出的主动电容触控的主动电容笔结构并不构成对主动电容触控的主动电容笔的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
在一可选实施例中，本发明提供了一种主动电容笔的控制方法，包括：在主动电容笔的第一电极和第二电极之间排布隔离地线；在隔离地线和系统地线之间连接有一个单刀单掷开关S1；当所述主动电容笔处于信号发送模式时，闭合所述单刀单掷开关S1；当所述主动电容笔处于信号接收模式时，断开所述单刀单掷开关S1。在一实施例中，如图3所示，本发明提供了一种主动电容笔的控制方法，包括：在隔离地线和系统地线之间连接一个单刀单掷的开关S1；当开关S1闭合时，电容屏触控笔处于信号发送模式，当开关S1断开时，电容屏触控笔处于信号接收模式。
在一可选实施例中，本发明提供了一种主动电容笔的控制方法，所述第一电极和所述第二电极分别通过通道选择开关连接模拟前端放大器；在隔离地线和通道选择开关之间还连接 有单刀单掷开关S2；当所述主动电容笔处于信号发送模式时，闭合所述单刀单掷开关S1、断开所述单刀单掷开关S2；当所述主动电容笔处于信号接收模式时，断开所述单刀单掷开关S1、闭合单刀单掷开关S2。在一实施例中，进一步地，如图4所示，本发明所提供的方法还包括在隔离地线和通道选择开关之间还设置有单刀单掷开关S2；当S1闭合、S2断开时，所述电容屏触控笔处于信号发送模式；当S1断开、S2闭合时，所述电容屏触控笔处于信号接收模式。
在一可选实施例中，本发明提供了一种主动电容笔的控制方法，所述主动电容笔通过所述隔离地线实现与电容触控屏通信。
在一可选实施例中，本发明提供了一种主动电容笔的控制方法，所述方法选择机械开关、通过分离电子元器件实现的电子开关或者通过集成电路实现的电子开关任意一者或多者多组合作为所述单刀单掷开关S1或所述单刀单掷开关S2。
本发明所述的主动电容笔的控制方法通过在隔离地线和系统地线之间设置单刀单掷的开关S1，当电容屏触控笔处于接收模式时，将隔离地线与系统地线断开，使隔离地线处于高阻状态，从而消除了通道一到地的电容和通道二到地的电容。同时，还可以在隔离地线和通道选择开关之间设置一个单刀单掷的开关S2，使得LD发射的上行信号会通过电容耦合被隔离地线接收，再经过通道选择开关与其它通道接收到的上行信号叠加在一起送到模拟前端放大器(AFE)。这样的连接不仅能消除通道一到地的电容和通道二到地的电容，还能进一步增加电容屏触控笔接收到的信号幅度，提高主动电容笔在各种工作状态下的与电容触控屏的时钟同步精度和数据接收准确率。
在一可选实施例中，本发明提供了一种主动电容笔的控制方法，使用所述方法仅通过第一电极接收上行信号，即只将通道一接收到的上行信号经过通道选择开关送到模拟前端放大器(AFE)，此时，模拟前端放大器的输入信号幅度的大小主要决定于：
其中，所述第一电极与电容触控屏之间的耦合电容为C1，主动电容笔的模拟前端放大器之前的所有器件与地之间形成的耦合电容为C5，提高了主动电容笔的灵敏度。
在一可选实施例中，本发明提供了一种主动电容笔的控制方法，使用所述方法仅通过第二电极接收上行信号，即只将通道二接收到的上行信号经过通道选择开关送到模拟前端放大器，此时，模拟前端放大器的输入信号幅度的大小主要决定于：
其中，所述第二电极与电容触控屏之间的耦合电容为C3，主动电容笔的模拟前端放大器之前的所有器件与地之间形成的耦合电容为C5，提高了主动电容笔的灵敏度。
在一可选实施例中，本发明提供了一种主动电容笔的控制方法，使用所述方法同时通过第一电极和第二电极接收上行信号，即同时将通道一和通道二接收到的上行信号经过通道选择开关送到模拟前端放大器，此时，模拟前端放大器的输入信号幅度的大小主要决定于：
其中，所述第一电极与电容触控屏之间的耦合电容为C1，所述第二电极与所述电容触控屏之间的耦合电容为C3，主动电容笔的模拟前端放大器之前的所有器件与地之间形成的耦合电容为C5，提高了主动电容笔的灵敏度。
基于相同的技术构思，一实施例中，本发明还提供一种主动电容触控的主动电容笔，如图3所示，在本发明提供了一种主动电容触控的主动电容笔，所述主动电容笔包括：
第一电极和第二电极，用于与电容触控屏之间通信；
隔离地线，排布于主动电容笔的第一电极和第二电极之间；
单刀单掷开关S1，连接所述隔离地线和系统地线；
当所述主动电容笔处于信号发送模式时，闭合所述单刀单掷开关S1；
当所述主动电容笔处于信号接收模式时，断开所述单刀单掷开关S1。
在一可选实施例中，如图4所示，本发明提供了一种主动电容触控的主动电容笔，所述主动电容笔至少还包括：
通道选择开关，用于将所述第一电极和所述第二电极分别连接模拟前端放大器；
单刀单掷开关S2，连接所述隔离地线和所述通道选择开关；
当所述主动电容笔处于信号发送模式时，闭合所述单刀单掷开关S1、断开所述单刀单掷开关S2；
当所述主动电容笔处于信号接收模式时，断开所述单刀单掷开关S1、闭合单刀单掷开关S2。同理，图4中示出的主动电容触控的主动电容笔结构也并不构成对主动电容触控的主动电容笔的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
当S1闭合、S2断开时，所述电容屏触控笔处于信号发送模式；当S1断开、S2闭合时，所述电容屏触控笔处于信号接收模式，同样地，也消除了通道一和通道二到地的寄生电容，同时，LD发射的上行信号会通过电容耦合被隔离地线接收，再经过通道选择开关与其它通道 接收到的上行信号叠加在一起送到模拟前端放大器(AFE)，能够进一步增加电容屏触控笔接收到的信号幅度。
在一可选实施例中，本发明提供了一种主动电容触控的主动电容笔，所述主动电容笔通过所述隔离地线实现与电容触控屏通信。
在一可选实施例中，本发明提供了一种主动电容触控的主动电容笔，
所述单刀单掷开关S1或所述单刀单掷开关S2通过机械开关、通过分离电子元器件实现的电子开关或者通过集成电路实现的电子开关任意一者或多者组合生成。优选的，开关S1和S2可以为电子开关，即在电容屏触控笔处于通电的状态下，自动运行固件中的程序执行上述开关S1和S2的通断操作；当然开关S1和S2也可以为模拟形式的开关，可以由设置与电容屏触控笔的外壳上的按键执行开关的通断操作。
在一可选实施例中，本发明提供了一种主动电容触控的主动电容笔，
仅通过第一电极接收上行信号，即只将通道一接收到的上行信号经过通道选择开关送到模拟前端放大器(AFE)，此时，模拟前端放大器的输入信号幅度的大小主要决定于：
其中，所述第一电极与电容触控屏之间的耦合电容为C1，主动电容笔的模拟前端放大器之前的所有器件与地之间形成的耦合电容为C5。
在一可选实施例中，本发明提供了一种主动电容触控的主动电容笔，
仅通过第二电极接收上行信号，即只将通道二接收到的上行信号经过通道选择开关送到模拟前端放大器，此时，模拟前端放大器的输入信号幅度的大小主要决定于：
其中，所述第二电极与电容触控屏之间的耦合电容为C3，主动电容笔的模拟前端放大器之前的所有器件与地之间形成的耦合电容为C5。
在一可选实施例中，本发明提供了一种主动电容触控的主动电容笔，
同时通过第一电极和第二电极接收上行信号，即同时将通道一和通道二接收到的上行信号经过通道选择开关送到模拟前端放大器，此时，模拟前端放大器的输入信号幅度的大小主要决定于：
其中，所述第一电极与电容触控屏之间的耦合电容为C1，所述第二电极与所述电容触控屏之间的耦合电容为C3，主动电容笔的模拟前端放大器之前的所有器件与地之间形成的耦合电容为C5。
本申请中的各个实施例均采用递进的方式描述，各个实施例之间相同相似的部分互相参见即可，每个实施例重点说明的都是与其他实施例的不同之处。尤其，对于的主动电容笔和设备实施例而言，由于其基本相似于方法实施例，所以其描述进行了简化，相关之处可参见方法实施例的部分说明即可。
本领域内的技术人员应明白，本发明的实施例可提供为方法、系统或计算机程序产品。因此，本发明可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本发明可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
计算机可读介质包括永久性和非永久性、可移动和非可移动媒体可以由任何方法或技术来实现信息存储。信息可以是计算机可读指令、数据结构、程序的模块或其他数据。计算机的存储介质的例子包括，但不限于相变内存(PRAM)、静态随机存取存储器(SRAM)、动态随机存取存储器(DRAM)、其他类型的随机存取存储器(RAM)、只读存储器(ROM)、电可擦除可编程只读存储器(EEPROM)、快闪记忆体或其他内存技术、只读光盘只读存储器(CD-ROM)、数字多功能光盘(DVD)或其他光学存储、磁盒式磁带，磁带磁磁盘存储或其他磁性存储设备或任何其他非传输介质，可用于存储可以被计算设备访问的信息。此外，尽管在附图中以特定顺序描述了本发明方法的操作，但是，这并非要求或者暗示必须按照该特定顺序来执行这些操作，或是必须执行全部所示的操作才能实现期望的结果。附加地或备选地，可以省略某些步骤，将多个步骤合并为一个步骤执行，和/或将一个步骤分解为多个步骤执行。
虽然已经参考若干具体实施例描述了本发明的精神和原理，但是应该理解，本发明并不限于所公开的具体实施例，对各方面的划分也不意味着这些方面中的特征不能组合以进行受益，这种划分仅是为了表述的方便。本发明旨在涵盖所附权利要求的精神和范围内所包括的各种修改和等同布置。

Claims (8)

  1. 一种主动电容笔的控制方法，包括：
    在所述主动电容笔的第一电极和第二电极之间排布隔离地线；
    在隔离地线和系统地线之间连接有一个单刀单掷开关S1；
    当所述主动电容笔处于信号发送模式时，闭合所述单刀单掷开关S1；
    当所述主动电容笔处于信号接收模式时，断开所述单刀单掷开关S1。
  2. 根据权利要求1所述的主动电容笔的控制方法，其中，所述第一电极和所述第二电极分别通过通道选择开关连接模拟前端放大器；
    在隔离地线和通道选择开关之间还连接有单刀单掷开关S2；
    当所述主动电容笔处于信号发送模式时，闭合所述单刀单掷开关S1、断开所述单刀单掷开关S2；
    当所述主动电容笔处于信号接收模式时，断开所述单刀单掷开关S1、闭合单刀单掷开关S2。
  3. 根据权利要求1或2所述的主动电容笔的控制方法，其中，所述主动电容笔通过所述隔离地线实现与电容触控屏通信。
  4. 根据权利要求1至3中任一项所述的主动电容笔的控制方法，其中，选择机械开关、通过分离电子元器件实现的电子开关或者通过集成电路实现的电子开关中任意一种或两种作为所述单刀单掷开关S1或所述单刀单掷开关S2。
  5. 一种主动电容触控的主动电容笔，包括：
    第一电极和第二电极，用于所述主动电容笔与电容触控屏之间通信；
    隔离地线，排布于所述主动电容笔的第一电极和第二电极之间；
    单刀单掷开关S1，连接所述隔离地线和系统地线；
    当所述主动电容笔处于信号发送模式时，闭合所述单刀单掷开关S1；
    当所述主动电容笔处于信号接收模式时，断开所述单刀单掷开关S1。
  6. 根据权利要求5所述的主动电容触控的主动电容笔，其中，所述主动电容笔至少还包括：
    通道选择开关，用于将所述第一电极和所述第二电极分别连接模拟前端放大器；
    单刀单掷开关S2，连接所述隔离地线和所述通道选择开关；
    当所述主动电容笔处于信号发送模式时，闭合所述单刀单掷开关S1、断开所述单刀单掷开关S2；
    当所述主动电容笔处于信号接收模式时，断开所述单刀单掷开关S1、闭合单刀单掷开关S2。
  7. 根据权利要求5或6所述的主动电容触控的主动电容笔，其中，所述主动电容笔通过所述隔离地线实现与电容触控屏通信。
  8. 根据权利要求5至7中任一项所述的主动电容触控的主动电容笔，其中，
    所述单刀单掷开关S1或所述单刀单掷开关S2通过机械开关、通过分离电子元器件实现的电子开关或者通过集成电路实现的电子开关中任意一种或两种实现。
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