CN115599231B - Control method of active capacitance pen and active capacitance pen - Google Patents
Control method of active capacitance pen and active capacitance pen Download PDFInfo
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- CN115599231B CN115599231B CN202211507925.6A CN202211507925A CN115599231B CN 115599231 B CN115599231 B CN 115599231B CN 202211507925 A CN202211507925 A CN 202211507925A CN 115599231 B CN115599231 B CN 115599231B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—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
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Abstract
The invention provides a control method of an active capacitance pen and the active capacitance pen, which comprises the following steps: arranging an isolation ground wire between a first electrode and a second electrode of the active capacitance pen; a single-pole single-throw switch S1 is connected between the isolation ground wire and the system ground wire; when the active capacitance pen is in a signal sending mode, a single-pole single-throw switch S1 is closed, an isolation ground wire and a system ground wire are connected together, and a downlink high-voltage signal is sent through a first electrode and a second electrode; when the circuit is in a signal receiving mode, the single-pole single-throw switch S1 is switched off, so that the isolation ground wire is in a high-impedance state. Thereby eliminating the channel-to-ground capacitance and the channel-to-ground capacitance. By using the method, parasitic capacitance between the first electrode and the second electrode and between the first electrode and the isolation ground wire can be eliminated, and the amplitude and the signal-to-noise ratio of an uplink signal received by the active capacitance pen are effectively improved, so that the clock synchronization precision and the data receiving accuracy of the active capacitance pen and the capacitance touch screen in various working states are greatly improved.
Description
Technical Field
The invention belongs to the field of electronic information processing, and particularly relates to a control method of an active capacitance pen and the active capacitance pen.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
The active capacitive pen transmits sensing signals to the capacitive screen through components and parts carried by the capacitive pen on the basis of the capacitive screen touch principle, and the capacitive touch screen receives the signals and calculates and positions to achieve the purpose of touch sensing. The higher-end active capacitance pen also realizes the real handwriting function by adding various sensors, such as pressure sensors and the like. The capacitive touch screen is required to receive an induction signal transmitted by the active capacitive pen, and also is required to complete other functions such as screen display, support of simultaneous work of a plurality of capacitive pens and the like. Therefore, the capacitive touch screen and the active capacitive pen need to be accurately synchronized in time, and the capacitive touch screen can transmit the sensing signal only when the capacitive touch screen is in a receiving state. In order to implement the time synchronization, the method in the prior art periodically transmits an uplink signal through the capacitive touch screen, and after receiving the uplink signal, the active capacitive pen transmits an induction signal in a specified time slot according to time information and a control command provided by the uplink signal. Therefore, the active capacitive pen can effectively complete information interaction with the capacitive touch screen only if the active capacitive pen can accurately receive the uplink signal transmitted by the capacitive touch screen.
When the active capacitance pen in the prior art receives or transmits an uplink signal, a common receiving circuit can be approximately represented by a circuit model as shown in fig. 1 and fig. 2. The LD is an uplink signal transmitting device of the capacitive touch screen. The uplink signal transmitted by the LD is coupled by capacitors (C1 and C3), received by RING (channel one) and TIP (channel two), and sent to an analog front end Amplifier (AFE) through a channel selection switch. When the active capacitive pen is in a sending mode, the capacitive screen touch pen needs to send two different downlink high-voltage signals through the first channel and the second channel at the same time. In order to isolate the two paths of downlink high-voltage signals, an isolation ground wire is arranged between the first channel and the second channel of the capacitive screen touch control pen. The isolated ground line thus creates a channel one to ground capacitance C2 and a channel two to ground capacitance C4 as shown in fig. 2. When the capacitive screen stylus is in the receive mode, the capacitive screen stylus receives the uplink signal in three ways:
the active capacitance pen only receives the uplink signal through the channel one, namely, only the uplink signal received by the channel one is sent to an analog front end Amplifier (AFE) through the channel selection switch. In this case, the gain of the uplink signal is mainly determined by:
K1=C1/(C1+C2+C5) (1) ，
and only receiving the uplink signal through the second channel, namely sending the uplink signal received by the second channel to an analog front end Amplifier (AFE) through the channel selection switch. In this case, the gain of the uplink signal is mainly determined by:
K2=C3/(C3+C4+C5) (2) ，
and simultaneously receiving the uplink signals through the first channel and the second channel, namely adding the uplink signals received by the first channel and the second channel together through a channel selection switch and sending the sum to an analog front end Amplifier (AFE). In this case, the gain of the uplink signal is mainly determined by:
K3=(C1+C3)/(C1+C3+C2+C4+C5) (3) ，
as can be seen from equations (1) to (3), no matter which way the capacitive screen stylus receives the uplink signal, the reception amplitude of the uplink signal is reduced due to the presence of C2 and C4.
Therefore, how to remove the influence of C2 and C4 and effectively improve the amplitude and the signal-to-noise ratio of the uplink signal received by the active capacitive pen, so as to improve the clock synchronization precision and the data receiving accuracy of the active capacitive pen and the capacitive touch screen in various working states is a problem to be solved urgently. In addition, in the prior art, the active capacitive stylus only has two communication channels, and does not have a situation of realizing communication with the capacitive touch screen through an isolation ground wire, and how to fully utilize the structure of the active capacitive stylus to expand the communication channels of the active capacitive stylus becomes another problem to be solved urgently.
Disclosure of Invention
In view of the problems in the prior art, a control method of an active capacitance pen, the active capacitance pen and a capacitive screen touch pen are provided.
The invention provides the following scheme:
in an alternative embodiment, the present invention provides a method for controlling an active capacitive stylus, comprising:
arranging an isolation ground wire between the first electrode RING and the second electrode TIP of the active capacitance pen;
a single-pole single-throw switch S1 is connected between the isolation ground wire and the system ground wire;
when the active capacitance pen is in a signal sending mode, closing the single-pole single-throw switch S1;
and when the active capacitance pen is in a signal receiving mode, the single-pole single-throw switch S1 is switched off.
In an alternative embodiment, the present invention provides a method for controlling an active capacitance pen, 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 isolation ground wire and the channel selection switch;
when the active capacitance pen is in a signal sending mode, closing the single-pole single-throw switch S1 and opening the single-pole single-throw switch S2;
and when the active capacitance pen is in a signal receiving mode, the single-pole single-throw switch S1 is switched off, and the single-pole single-throw switch S2 is switched on.
In an alternative embodiment, the present invention provides a method for controlling an active capacitive stylus, where the active capacitive stylus communicates with a capacitive touch screen through the isolation ground.
In an alternative embodiment, the present invention provides a method for controlling an active capacitive stylus, wherein either one or both of a mechanical switch, an electronic switch implemented by separating electronic components, or an electronic switch implemented by an integrated circuit is selected as the single-pole single-throw switch S1 or the single-pole single-throw switch S2.
In an alternative embodiment, the present invention provides a method for controlling an active capacitance pen, wherein the method is used to receive uplink signals only through the first electrode RING, that is, only channel-one received uplink signals are sent to an analog front end Amplifier (AFE) through a channel selection switch, and the amplitude of the input signal of the analog front end amplifier is mainly determined by:
K1=C1/（C1+C5），
wherein, C1 is a coupling capacitance between the first electrode and the capacitive touch screen, and C5 is a coupling capacitance formed between all devices before the analog front-end amplifier of the active capacitive pen and the ground.
In an alternative embodiment, the present invention provides a method for controlling an active capacitance pen, wherein the method is used to receive uplink signals only through the second electrode TIP, that is, only uplink signals received by the second channel are sent to the analog front-end amplifier through the channel selection switch, and at this time, the magnitude of the amplitude of the input signal of the analog front-end amplifier is mainly determined by:
K2=C3/（C3+C5），
wherein C3 is a coupling capacitance between the second electrode and the capacitive touch screen, and C5 is a coupling capacitance formed between all devices before the analog front-end amplifier of the active capacitive pen and ground.
In an alternative embodiment, the present invention provides a method for controlling an active capacitance pen, wherein the method is used to simultaneously receive uplink signals through a first electrode RING and a second electrode TIP, that is, simultaneously transmit uplink signals received by a channel one and a channel two to an analog front end amplifier through a channel selection switch, and the amplitude of an input signal of the analog front end amplifier is mainly determined by:
K3= （C1+C3）/（C1+C3+C5），
wherein C1 is a coupling capacitance between the first electrode and the capacitive touch screen, C3 is a coupling capacitance between the second electrode and the capacitive touch screen, and C5 is a coupling capacitance formed between all devices before the analog front-end amplifier of the active capacitive pen and the ground.
In an alternative embodiment, the present invention provides an active capacitive stylus for active capacitive touch, the active capacitive stylus comprising:
the first electrode and the second electrode are used for communicating with the capacitive touch screen;
the isolation ground wire is arranged between the first electrode and the second electrode of the active capacitance pen;
the single-pole single-throw switch S1 is connected with the isolation ground wire and the system ground wire;
when the active capacitance pen is in a signal sending mode, closing the single-pole single-throw switch S1;
and when the active capacitance pen is in a signal receiving mode, the single-pole single-throw switch S1 is switched off.
In an optional embodiment, the present invention provides an active capacitive stylus for active capacitive touch, the active capacitive stylus further comprising:
the channel selection switch is used for connecting the first electrode and the second electrode with an analog front-end amplifier respectively;
the single-pole single-throw switch S2 is connected with the isolation ground wire and the channel selection switch;
when the active capacitance pen is in a signal sending mode, closing the single-pole single-throw switch S1 and opening the single-pole single-throw switch S2;
and when the active capacitance pen is in a signal receiving mode, the single-pole single-throw switch S1 is switched off, and the single-pole single-throw switch S2 is switched on.
In an alternative embodiment, the present invention provides an active capacitive stylus for active capacitive touch, wherein the active capacitive stylus communicates with a capacitive touch screen through the isolated ground.
In an embodiment, the invention provides an active capacitive stylus for active capacitive touch, where the single-pole single-throw switch S1 or the single-pole single-throw switch S2 is implemented by any one or two of a mechanical switch, an electronic switch implemented by separating electronic components, or an electronic switch implemented by an integrated circuit.
In an alternative embodiment, the present invention provides an active capacitance pen with active capacitance touch control, which receives uplink signals only through a first electrode, that is, only sends uplink signals received through a channel-one to an analog front end Amplifier (AFE) through a channel selection switch, wherein the amplitude of the input signal of the AFE is mainly determined by:
K1=C1/（C1+C5），
the coupling capacitance between the first electrode and the capacitive touch screen is C1, and the coupling capacitance formed between all devices before the analog front-end amplifier of the active capacitive pen and the ground is C5.
In an alternative embodiment, the present invention provides an active capacitive stylus for active capacitive touch, wherein the uplink signal is received only through the second electrode, i.e. the uplink signal received only through the second channel is sent to the analog front end amplifier through the channel selection switch, and at this time, the amplitude of the input signal of the analog front end amplifier is mainly determined by:
K2=C3/（C3+C5），
the coupling capacitance between the second electrode and the capacitive touch screen is C3, and the coupling capacitance formed between all devices in front of the analog front-end amplifier of the active capacitive pen and the ground is C5.
In an optional embodiment, the present invention provides an active capacitive stylus for active capacitive touch, wherein the first electrode and the second electrode are used for receiving uplink signals, that is, the uplink signals received by the first channel and the second channel are sent to the analog front-end amplifier through the channel selection switch, and the amplitude of the input signal of the analog front-end amplifier is mainly determined by:
K3=（C1+C3）/（C1+C3+C5），
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, and the coupling capacitance formed between all devices before the analog front-end amplifier of the active capacitive pen and the ground is C5.
The invention has the beneficial effects that the invention provides a control method of an active capacitance pen and the active capacitance pen, wherein an isolation ground wire is arranged between a first electrode and a second electrode of the active capacitance pen; a single-pole single-throw switch S1 is connected between the isolation ground wire and the system ground wire; when the active capacitance pen is in a signal sending mode, closing the single-pole single-throw switch S1, connecting the isolation ground wire and the system ground wire together, and sending a downlink high-voltage signal through the first electrode and the second electrode; when the circuit is in a signal receiving mode, the single-pole single-throw switch S1 is switched off, so that the isolation ground wire is in a high-impedance state. Thereby eliminating the channel-to-ground capacitance and the channel-to-ground capacitance. By using the method, parasitic capacitance between the first electrode and the second electrode and between the first electrode and the isolation ground wire can be eliminated, and the amplitude and the signal-to-noise ratio of an uplink signal received by the active capacitance pen are effectively improved, so that the clock synchronization precision and the data receiving accuracy of the active capacitance pen and the capacitance touch screen in various working states are greatly improved. Furthermore, the first electrode and the second electrode are respectively connected with an analog front-end amplifier through a channel selection switch; a single-pole single-throw switch S2 is also connected between the isolation ground wire and the channel selection switch; when the active capacitance pen is in a signal sending mode, the single-pole single-throw switch S1 is closed, the single-pole single-throw switch S2 is opened, and the function of sending downlink high-voltage signals through the first ground wire isolation channel and the second ground wire isolation channel is achieved; and when the active capacitance pen is in a signal receiving mode, the single-pole single-throw switch S1 is switched off, and the single-pole single-throw switch S2 is switched on. At this time, the LD is an uplink signal transmitting device of the capacitive touch screen, and an uplink signal transmitted by the LD is received by an isolated ground line through capacitive coupling, and is superimposed with uplink signals received by other channels through a channel selection switch to be sent to an analog front end Amplifier (AFE). Such a connection not only eliminates the capacitance from channel one to ground and the capacitance from channel two to ground, but also further increases the signal amplitude received by the capacitive screen stylus. The amplitude and the signal-to-noise ratio of the uplink signal received by the active capacitive pen are effectively improved, so that the clock synchronization precision and the data receiving accuracy of the active capacitive pen and the capacitive touch screen in various working states are greatly improved. The communication between the active capacitance pen and the capacitance touch screen is realized by isolating the ground wire, the communication channel of the active capacitance pen is expanded by fully utilizing the structure of the active capacitance pen, so that the active capacitance pen with two channels is expanded into the active capacitance pen with three channels, and compared with the prior art, the active capacitance pen has outstanding substantive characteristics and remarkable progress.
It should be understood that the above description is only an overview of the technical solutions of the present invention, so as to clearly understand the technical means of the present invention, and thus can be implemented according to the content of the description. In order that the manner in which the above recited and other objects, features and advantages of the present invention are obtained will be readily understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
Drawings
The advantages and benefits described herein, as well as other advantages and benefits, will be apparent to those of ordinary skill in the art upon reading the following detailed description of the exemplary embodiments. The drawings are only for purposes of illustrating exemplary embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like elements throughout. In the drawings:
FIG. 1 is a diagram illustrating an external structure of an active capacitive stylus in the prior art;
FIG. 2 is a schematic diagram of a prior art circuit model of an active capacitance pen;
FIG. 3 is a schematic diagram of a two-channel circuit model of an active capacitance pen according to an embodiment of the invention;
fig. 4 is a schematic diagram of a three-channel circuit model of an active capacitance pen according to another embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In the description of the embodiments of the present application, it should be understood that terms such as "including" or "having" are intended to indicate the presence of the features, numerals, steps, actions, components, parts, or combinations thereof disclosed in the specification, and are not intended to preclude the possibility of the presence of one or more other features, numerals, steps, actions, components, parts, or combinations thereof.
Unless otherwise stated, "/" indicates an OR meaning, e.g., A/B may indicate A or B; "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone.
The terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present application, "a plurality" means two or more unless otherwise specified.
All code in this application is exemplary and variations will occur to those skilled in the art based upon the programming language used, the specific needs and personal habits without departing from the spirit of the application.
As described above, when the active capacitive stylus of the conventional scheme receives an uplink signal, a parasitic capacitance from two channels to ground is generated due to the existence of a system ground line between the channels, and due to the existence of the parasitic capacitance, the reception amplitude of the uplink signal is reduced, which affects the data reception accuracy in the operation process of the capacitive screen stylus.
To address, at least in part, one or more of the above problems and other potential problems, example embodiments of the present disclosure propose a method of controlling an active capacitive stylus. In the method, a signal sending circuit model of a pen point of an active capacitance touch screen is redesigned, and at least one single-pole single-throw switch is inserted between a system ground wire and an isolation ground wire (namely one end of a parasitic capacitor existing between a channel and the ground wire). When the capacitive screen touch control pen is in a sending mode, the isolation ground wire and the system ground wire are in a short circuit, downlink high-voltage signals between channels are isolated, and when the capacitive screen touch control pen is in a receiving mode, the isolation ground wire and the system ground wire are disconnected, so that the isolation ground wire is in a high-resistance state, the parasitic capacitance from the channels to the ground is eliminated, and the sensitivity of the active capacitive pen is improved. The communication between the active capacitance pen and the capacitance touch screen is realized by isolating the ground wire, the communication channel of the active capacitance pen is expanded by fully utilizing the structure of the active capacitance pen, so that the active capacitance pen with two channels is expanded into the active capacitance pen with three channels, and compared with the prior art, the active capacitance pen has outstanding substantive characteristics and remarkable progress.
Referring first to fig. 1, a diagram schematically illustrating an external structure relationship of an active capacitance pen in the prior art is similar to an arrangement relationship of external structures of the active capacitance pen in an exemplary implementation of the present disclosure. The invention relates to an active capacitance pen which comprises a pen holder, a pen point and an inner core, wherein the pen point is arranged at one end of the pen holder, the inner core is arranged in the pen holder, the inner core comprises a first electrode RING, a second electrode TIP and an isolation ground wire, the second electrode is columnar, the first electrode surrounds the second electrode, at least part of the first electrode is wrapped, and the isolation ground wire is arranged between the first electrode and the second electrode. A TIP, said TIP comprising a channel one (RING) and a channel Two (TIP), said channel one and said channel two having an isolated ground therebetween; the first channel is carried by the first electrode and the second channel is carried by the second electrode.
The first electrode, the second electrode and the isolation ground wire are arranged at one end of the capacitive pen along the longitudinal direction and can generate coupling capacitance with the capacitive touch screen, communication between the active capacitive pen and the capacitive touch screen is achieved, the structure is flexible, resources are saved, operation is flexible, and use is convenient.
Fig. 3 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 fig. 3 is a schematic structural diagram of a hardware operating environment of a control method of an active capacitance pen. The device based on the control method of the active capacitive pen in the embodiment of the invention can be a capacitive screen touch pen. Those skilled in the art will appreciate that the active capacitive stylus architecture of the active capacitive touch illustrated in fig. 3 does not constitute a limitation of active capacitive stylus, and may include more or fewer components than illustrated, or some components in combination, or a different arrangement of components.
In an alternative embodiment, the present invention provides a method for controlling an active capacitive stylus, comprising: arranging an isolation ground wire between a first electrode and a second electrode of the active capacitance pen; a single-pole single-throw switch S1 is connected between the isolation ground wire and the system ground wire; when the active capacitance pen is in a signal sending mode, closing the single-pole single-throw switch S1; and when the active capacitance pen is in a signal receiving mode, the single-pole single-throw switch S1 is switched off. In an embodiment, as shown in fig. 3, the present invention provides a method for controlling an active capacitance pen, including: a single-pole single-throw switch S1 is connected between the isolation ground wire and the system ground wire; when the switch S1 is closed, the capacitive screen touch pen is in a signal sending mode, and when the switch S1 is disconnected, the capacitive screen touch pen is in a signal receiving mode.
In an alternative embodiment, the present invention provides a method for controlling an active capacitive pen, wherein the first electrode and the second electrode 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 isolation ground wire and the channel selection switch; when the active capacitance pen is in a signal sending mode, closing the single-pole single-throw switch S1 and opening the single-pole single-throw switch S2; and when the active capacitance pen is in a signal receiving mode, the single-pole single-throw switch S1 is switched off, and the single-pole single-throw switch S2 is switched on. In an embodiment, further, as shown in fig. 4, the method provided by the present invention further includes disposing a single-pole single-throw switch S2 between the isolated ground and the channel selection switch; when S1 is closed and S2 is opened, the capacitive screen touch pen is in a signal sending mode; and when the S1 is disconnected and the S2 is closed, the capacitive screen touch pen is in a signal receiving mode.
In an alternative embodiment, the present invention provides a method for controlling an active capacitive stylus, where the active capacitive stylus communicates with a capacitive touch screen through the isolation ground.
In an alternative embodiment, the present invention provides a method for controlling an active capacitance pen, wherein any one or more of a mechanical switch, an electronic switch implemented by separating electronic components, or an electronic switch implemented by an integrated circuit is selected as the single-pole single-throw switch S1 or the single-pole single-throw switch S2.
According to the control method of the active capacitance pen, the single-pole single-throw switch S1 is arranged between the isolation ground wire and the system ground wire, when the capacitance screen touch control pen is in a receiving mode, the isolation ground wire is disconnected with the system ground wire, so that the isolation ground wire is in a high-resistance state, and therefore the capacitance from a channel I to the ground and the capacitance from a channel II to the ground are eliminated. Meanwhile, a single-pole single-throw switch S2 can be arranged between the isolation ground wire and the channel selection switch, so that an uplink signal transmitted by the LD can be received by the isolation ground wire through capacitive coupling, and then is superposed with uplink signals received by other channels through the channel selection switch and sent to an analog front end Amplifier (AFE). The connection can not only eliminate the capacitance from the channel I to the ground and the capacitance from the channel II to the ground, but also further increase the signal amplitude received by the capacitive touch screen stylus, and improve the clock synchronization precision and the data receiving accuracy of the active capacitive touch screen in various working states.
In an alternative embodiment, the present invention provides a method for controlling an active capacitance pen, using the method to receive uplink signals only through a first electrode, that is, only channel-one received uplink signals are sent to an analog front end Amplifier (AFE) through a channel selection switch, where the amplitude of the input signal of the analog front end amplifier is mainly determined by:
K1=C1/（C1+C5），
the coupling capacitance between the first electrode and the capacitive touch screen is C1, and the coupling capacitance formed between all devices in front of the analog front-end amplifier of the active capacitive pen and the ground is C5, so that the sensitivity of the active capacitive pen is improved.
In an alternative embodiment, the present invention provides a method for controlling an active capacitance pen, using the method to receive uplink signals only through a second electrode, that is, only sending uplink signals received by a channel two to an analog front-end amplifier through a channel selection switch, where the magnitude of the amplitude of the input signal of the analog front-end amplifier is mainly determined by:
K2=C3/（C3+C5），
the coupling capacitance between the second electrode and the capacitive touch screen is C3, and the coupling capacitance formed between all devices in front of the analog front-end amplifier of the active capacitive pen and the ground is C5, so that the sensitivity of the active capacitive pen is improved.
In an alternative embodiment, the present invention provides a method for controlling an active capacitance pen, where the method is used to simultaneously receive uplink signals through a first electrode and a second electrode, that is, simultaneously send uplink signals received through a first channel and a second channel to an analog front-end amplifier through a channel selection switch, where the amplitude of an input signal of the analog front-end amplifier is mainly determined by:
K3=（C1+C3）/（C1+C3+C5），
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, and the coupling capacitance formed between all devices in front of the analog front-end amplifier of the active capacitive pen and the ground is C5, so that the sensitivity of the active capacitive pen is improved.
Based on the same technical concept, in an embodiment, the present invention further provides an active capacitive stylus for active capacitive touch, as shown in fig. 3, the active capacitive stylus for active capacitive touch provided by the present invention includes:
the first electrode and the second electrode are used for communicating with the capacitive touch screen;
the isolation ground wire is arranged between the first electrode and the second electrode of the active capacitance pen;
the single-pole single-throw switch S1 is connected with the isolation ground wire and the system ground wire;
when the active capacitance pen is in a signal sending mode, closing the single-pole single-throw switch S1;
and when the active capacitance pen is in a signal receiving mode, the single-pole single-throw switch S1 is switched off.
In an alternative embodiment, as shown in fig. 4, the present invention provides an active capacitance pen for active capacitance touch control, the active capacitance pen at least further comprising:
the channel selection switch is used for connecting the first electrode and the second electrode with an analog front-end amplifier respectively;
the single-pole single-throw switch S2 is connected with the isolation ground wire and the channel selection switch;
when the active capacitance pen is in a signal sending mode, closing the single-pole single-throw switch S1 and opening the single-pole single-throw switch S2;
and when the active capacitance pen is in a signal receiving mode, the single-pole single-throw switch S1 is switched off, and the single-pole single-throw switch S2 is switched on. Likewise, the active capacitive stylus structure of the active capacitive touch illustrated in fig. 4 also does not constitute a limitation of the active capacitive stylus of the active capacitive touch and may include more or fewer components than those illustrated, or some components in combination, or a different arrangement of components.
When S1 is closed and S2 is opened, the capacitive screen touch pen is in a signal sending mode; when the S1 is disconnected and the S2 is closed, the capacitive screen touch pen is in a signal receiving mode, similarly, parasitic capacitance from the channel I and the channel II to the ground is eliminated, meanwhile, an uplink signal transmitted by the LD is received by the isolation ground wire through capacitive coupling, and is superposed with uplink signals received by other channels through the channel selection switch and then sent to the analog front end Amplifier (AFE), so that the amplitude of the signals received by the capacitive screen touch pen can be further increased.
In an alternative embodiment, the present invention provides an active capacitive stylus for active capacitive touch, the active capacitive stylus communicating with a capacitive touch screen through the isolation ground.
In an alternative embodiment, the present invention provides an active capacitive stylus for active capacitive touch,
the single-pole single-throw switch S1 or the single-pole single-throw switch S2 is generated by any one or combination of a mechanical switch, an electronic switch realized by separating electronic components or an electronic switch realized by an integrated circuit. Preferably, the switches S1 and S2 may be electronic switches, that is, when the capacitive screen stylus is in a power-on state, a program in the automatic running firmware executes the on-off operation of the switches S1 and S2; of course, the switches S1 and S2 may also be analog switches, and the on/off operation of the switches may be performed by keys arranged on the housing of the capacitive screen stylus.
In an alternative embodiment, the present invention provides an active capacitive stylus for active capacitive touch,
only the uplink signal is received through the first electrode, that is, only the uplink signal received by channel one is sent to the analog front end Amplifier (AFE) through the channel selection switch, and at this time, the magnitude of the input signal amplitude of the analog front end amplifier is mainly determined by:
K1=C1/（C1+C5），
the coupling capacitance between the first electrode and the capacitive touch screen is C1, and the coupling capacitance formed between all devices before the analog front-end amplifier of the active capacitive pen and the ground is C5.
In an alternative embodiment, the present invention provides an active capacitive stylus for active capacitive touch,
only the second electrode receives the uplink signal, that is, only the uplink signal received by the channel two is sent to the analog front-end amplifier through the channel selection switch, and at this time, the magnitude of the input signal amplitude of the analog front-end amplifier is mainly determined by:
K2=C3/（C3+C5），
the coupling capacitance between the second electrode and the capacitive touch screen is C3, and the coupling capacitance formed between all devices before the analog front-end amplifier of the active capacitive pen and the ground is C5.
In an alternative embodiment, the present invention provides an active capacitive stylus for active capacitive touch,
meanwhile, the uplink signals are received through the first electrode and the second electrode, that is, the uplink signals received by the first channel and the second channel are simultaneously sent to the analog front-end amplifier through the channel selection switch, and at this time, the magnitude of the input signal amplitude of the analog front-end amplifier is mainly determined by:
K3=（C1+C3）/（C1+C3+C5），
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, and the coupling capacitance formed between all devices in front of the analog front-end amplifier of the active capacitive pen and the ground is C5.
The embodiments in the present application are described in a progressive manner, and the same and similar parts among the embodiments can be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the active capacitive stylus and device embodiments, the description is simplified since it is substantially similar to the method embodiments, and reference may be made to some of the description of the method embodiments for related points.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Computer-readable media, including both permanent and non-permanent, removable and non-removable media, may implement the information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, 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, compact disc read only memory (CD-ROM), digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Moreover, while the operations of the method of the invention are depicted in the drawings in a particular order, this does not require or imply that the operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
While the spirit and principles of the invention have been described with reference to several particular embodiments, it is to be understood that the invention is not limited to the particular embodiments disclosed, nor is the division of aspects, which is for convenience only as the features in such aspects may not be combined to benefit. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.
Claims (6)
1. A method for controlling an active capacitive stylus, comprising:
arranging an isolation ground wire between a first electrode and a second electrode of the active capacitance pen;
a single-pole single-throw switch S1 is connected between the isolation ground wire and the system ground wire;
when the active capacitance pen is in a signal sending mode, closing the single-pole single-throw switch S1;
when the active capacitance pen is in a signal receiving mode, the single-pole single-throw switch S1 is switched off;
the first electrode and the second electrode are respectively connected with an analog front-end amplifier through a channel selection switch;
a single-pole single-throw switch S2 is also connected between the isolation ground wire and the channel selection switch;
when the active capacitance pen is in a signal sending mode, closing the single-pole single-throw switch S1 and opening the single-pole single-throw switch S2;
and when the active capacitance pen is in a signal receiving mode, the single-pole single-throw switch S1 is switched off, and the single-pole single-throw switch S2 is switched on.
2. The method of claim 1, wherein the active capacitive stylus communicates with a capacitive touch screen through the isolated ground.
3. The method for controlling an active capacitive stylus according to claim 1, wherein either one or both of a mechanical switch, an electronic switch implemented by separating electronic components, or an electronic switch implemented by an integrated circuit is selected as the single-pole single-throw switch S1 and/or the single-pole single-throw switch S2.
4. An active capacitive pen for active capacitive touch, comprising:
the first electrode and the second electrode are used for communication between the active capacitance pen and the capacitance touch screen;
the isolation ground wire is arranged between the first electrode and the second electrode of the active capacitance pen;
the single-pole single-throw switch S1 is connected with the isolation ground wire and the system ground wire;
when the active capacitance pen is in a signal sending mode, closing the single-pole single-throw switch S1;
when the active capacitance pen is in a signal receiving mode, the single-pole single-throw switch S1 is switched off;
the channel selection switch is used for connecting the first electrode and the second electrode with an analog front-end amplifier respectively;
the single-pole single-throw switch S2 is connected with the isolation ground wire and the channel selection switch;
when the active capacitance pen is in a signal sending mode, closing the single-pole single-throw switch S1 and opening the single-pole single-throw switch S2;
and when the active capacitance pen is in a signal receiving mode, the single-pole single-throw switch S1 is switched off, and the single-pole single-throw switch S2 is switched on.
5. The active capacitive stylus of claim 4, wherein the active capacitive stylus communicates with a capacitive touch screen through the isolated ground.
6. The active capacitive stylus of claim 4, wherein the stylus is configured to be coupled to a touch pad,
the single-pole single-throw switch S1 or the single-pole single-throw switch S2 is realized by any one or two of a mechanical switch, an electronic switch realized by separating electronic components or an electronic switch realized by an integrated circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202211507925.6A CN115599231B (en) | 2022-11-29 | 2022-11-29 | Control method of active capacitance pen and active capacitance pen |
| PCT/CN2023/133936 WO2024114522A1 (en) | 2022-11-29 | 2023-11-24 | Active capacitive stylus control method and active capacitive stylus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211507925.6A CN115599231B (en) | 2022-11-29 | 2022-11-29 | Control method of active capacitance pen and active capacitance pen |
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| CN115599231B true CN115599231B (en) | 2023-04-07 |
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| WO (1) | WO2024114522A1 (en) |
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| CN115599231B (en) * | 2022-11-29 | 2023-04-07 | 天津希格玛微电子技术有限公司 | Control method of active capacitance pen and active capacitance pen |
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| CN115599231A (en) | 2023-01-13 |
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