CN103729073A - Active capacitive stylus and touch detection and feedback drive method thereof - Google Patents
Active capacitive stylus and touch detection and feedback drive method thereof Download PDFInfo
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- CN103729073A CN103729073A CN201310713635.1A CN201310713635A CN103729073A CN 103729073 A CN103729073 A CN 103729073A CN 201310713635 A CN201310713635 A CN 201310713635A CN 103729073 A CN103729073 A CN 103729073A
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Abstract
The invention discloses an active capacitive stylus and a touch detection and feedback drive method thereof. The active capacitive stylus comprises a conductive point, a signal processing module and a capacitor. The conductive point is used for detecting a touch screen drive signal transmitted by a touch screen and sending a feedback drive signal output from the signal processing module. The signal processing module is used for processing the touch screen drive signal received by the conductive point and generating a synchronous feedback drive signal. The capacitor is arranged between the conductive point and the signal processing module. During detection, the capacitor is used for coupling the touch screen drive signal acquired by the conductive point to the input end of the signal processing module. When the touch screen is in feedback drive, the capacitor is used for isolating the feedback drive signal. By the touch detection and feedback drive method, the purpose of positioning the position of the conductive point of the active capacitive stylus accurately is achieved.
Description
Technical field
The present invention, about a kind of input media using on touch-screen, particularly relates to a kind of active electric capacity pen and touch control detection and feedback driving method.
Background technology
Along with scientific and technological development and progress, user requires more and more higher to the input mode of mobile phone peace plate computer, be not content with traditional keyboard input, tended to gradually touch-control input easily, touch-control input equipment is mainly touch screens and capacitance plate on the market at present.Capacitance plate possesses highly sensitive and easily realizes the advantage of multi-point touch, its just gradually substitutional resistance screen become main flow touch-control input screen, it is divided into two kinds of surface capacitance type and projected capacitives.Two kinds of minute mutual capacitance (mutual capacitive) of projecting type capacitor screen and self-capacitances (self capacitive), mutual capacitance type touch screen comprises two groups of vertical electrode arrays and a touch screen controller, one electrode array is as drive electrode, another electrode array is detecting electrode, between electrode, form mutual capacitance, electrode pair ground forms self-capacitance, drive electrode is launched touch-screen and is driven signal under the driving of the driver module of touch screen controller, detecting electrode receives above-mentioned touch-screen and drives signal, when the conducting objects of ground connection (finger etc.) is during near capacitance plate, affect the value of the mutual capacitance between drive electrode and detecting electrode, detecting electrode is realized touch-control and is located by detecting this capacitance variations, the all electrodes of self-capacitance formula touch-screen are that drive electrode is also detecting electrode simultaneously, and touch screen controller can drive a strip electrode, whether have the conducting objects of ground connection near the capacitance variation that and then detects this strip electrode judges, surface capacitance type touch screen electrode is drawn from four jiaos, its ultimate principle be also detect conductor near time capacitance variations carry out perception touch point positional information.
Whether pointer is by using power supply to divide passive pointer and active touch control pen.Passive pointer is to use simply conducting objects (conductor or conductive rubber etc.) simulating human finger, between nib and touch-screen driving bus, form an electric capacity, to affect the testing result of touch-screen, but passive pointer shortcoming is nib larger (being often greater than 2mm).
There is signal processing module active electric capacity pen inside, the driving signal of meeting active probe touch-screen, and its conduction nib can be very thin, and just as oscillographic probe, the signal processing module that couples a signal to active electric capacity pen inside is processed rear output.Active touch control pen also has two kinds: inductance pen (EMR) and active electric capacity pen.Inductance pen (EMR) need to add one deck inductance induction screen or sensor (Sensor) on touch-screen, need extra hardware could realize writing function, not only thickness increases, cost also increases, certainly industrial design is more ugly, and can not use on the product that only has conventional touch screen on existing market; Active electric capacity pen, does not need inductance induction screen or sensor Sensor, does not increase screen thick, can directly use the touch-screen on existing market.
US Patent No. 20120154340 " ACTIVE STYLUS FOR USE WITH TOUCH-SENSITIVE INTERFACES AND CORRESPONDING METHOD " and US20130002606 " STYLUS AND STYLUS CIRCUITRY FOR CAPACITIVE TOUCH SCREENS " have respectively disclosed a kind of active electric capacity pen, the design that two patents all adopt detecting electrode and drive electrode to separate, has following shortcoming:
One of shortcoming, common people write all can be suitable an inclination body to meet user's writing style.US Patent No. 20120154340 and US20130002606 drive signal by larger nib or a body transmitting feedback, and nib or a body have certain distance with touch-screen, when user's active electric capacity pen body that tilts, feedback drives the intensity distributions of signal on touch-screen just can be centered by nib, and can be partial to a body relatively near beyond touch-screen.This deviation is to have no idea to correct with follow-up algorithm.Because touch screen controller or main frame cannot be known the amplitude that an active electric capacity pen body tilts at all;
Two of shortcoming, US Patent No. 20120154340 and US20130002606 are the designs that adopts detecting electrode and drive electrode to separate, and detection and transmitting feedback drive and carry out simultaneously, if do not do good isolation between the two poles of the earth, the drive feedback signal of transmitting can be coupled to detecting electrode and cause concussion.
Summary of the invention
The deficiency existing for overcoming above-mentioned prior art, one of the present invention object is to provide a kind of active electric capacity pen and touch control detection and driving method, it not only can accurately locate the position of active electric capacity pen conduction nib, and can easily to differentiate conducting objects be finger or active electric capacity pen.
Another object of the present invention is to provide a kind of active electric capacity pen and touch control detection and driving method, and this active electric capacity pen can be according to setting the feedback driving signal that transmits varying strength.
For reaching above-mentioned and other object, in one of the present invention preferred embodiment, the present invention proposes a kind of active electric capacity pen, comprise conduction nib, signal processing module and an electric capacity, described conduction nib drives signal and launches the feedback driving signal of described signal processing module output for detection of the touch-screen of touch-screen transmitting; The described touch-screen that described signal processing module receives for the treatment of described conduction nib drives signal and produces synchronous feedback and drives signal; Described electric capacity is arranged between described conduction nib and described signal processing module, when detecting, the described touch-screen that described electric capacity obtains for the described conduction nib that is coupled drives signal to the input end of described signal processing module, when feedback drives described touch-screen, described electric capacity is used for isolating described feedback and drives signal.
Further, this signal processing module comprises:
Testing circuit, the touch-screen of launching for detection of described touch-screen drives rising edge or the negative edge of signal;
Control circuit, when described testing circuit detects described touch-screen driving signal rising edge or negative edge, control described signal processing module and enter feedback driving condition by detected state, according to setting, adjust the voltage that the start and end time of described feedback driving signal or the delay of feedback driving signal rising edge and negative edge or feedback drive signal, described feedback drives signal to drive the rising edge of signal or negative edge to finish before arriving at next touch-screen, makes described signal processing module again enter detected state by driving condition;
Feedback driving circuit, this module adopts ternary output, and when detecting, it is output as high resistance makes described conduction nib in vacant state, when driving, described feedback is driven signal to be sent to described conduction nib under described control module is controlled and realize the feedback driving to described touch-screen.
Further, described signal processing module also comprises a holding circuit, and described holding circuit is comprised of the diode of two or more parallel connected in reverse phase, one termination fixed-bias transistor circuit, the input end of testing circuit described in another termination
Further, described active electric capacity pen also comprises an auxiliary detection electrode, and described auxiliary detection electrode is arranged at the input end of described signal processing module, to strengthen the detectability that described touch-screen is driven to signal.
For achieving the above object, the invention provides a kind of touch control detection of active electric capacity pen and the method that feedback drives, comprise the steps:
Step 1, active electric capacity pen detects the touch-screen driving signal of touch-screen transmitting in a detection and the sense cycle of feedback drive cycle by detecting electrode;
For achieving the above object, the present invention also provides a kind of touch control detection of active electric capacity pen and the method that feedback drives, and comprises the steps:
Step 1, active electric capacity pen detects the touch-screen driving signal of touch-screen transmitting in a detection and the sense cycle of feedback drive cycle by detecting electrode;
Further, if in a detection and feedback drive cycle, described feedback drives signal to comprise over a rising edge or negative edge, and described feedback drives the intensity adjustment of signal to realize by the delay between the delay between rising edge and negative edge or negative edge and rising edge.
In another preferred embodiment of the present invention, the invention provides a kind of active electric capacity pen, described active electric capacity pen comprises detecting electrode, drive electrode and signal processing module; Described detecting electrode drives signal and is sent to described signal processing module for the touch-screen of induction touch panel transmitting; The touch-screen that described signal processing module receives for the treatment of this detecting electrode drives signal and produces synchronous feedback and drives signal; Described feedback drives signal to be launched to described touch-screen by described drive electrode, under coordinating, realizes touch-screen location algorithm accurately location, described drive electrode utilizes conductive pen point or conductive stylus body or metal wire or wiring board track to make for conduction nib, described detecting electrode.
Compared with prior art, the method of a kind of active electric capacity pen of the present invention and touch control detection and driving, by testing circuit and feedback driving circuit are separated in sequential, effectively avoid signal processing module to form closed loop and produce self-sustained oscillation, it not only can accurately locate the position of active electric capacity pen conduction nib, and more easily differentiate conducting objects be finger or active electric capacity pen, meanwhile, the present invention's active electric capacity pen can also be according to setting the feedback driving signal that transmits varying strength.
Accompanying drawing explanation
Fig. 1 is the structural representation of common touch-screen system;
Fig. 2 is the overall construction drawing of the active electric capacity pen that the present invention applied;
Fig. 3 is the structural representation of the first preferred embodiment of a kind of active electric capacity pen of the present invention;
Fig. 4 is the basic framework figure of signal processing module in the present invention's the first preferred embodiment;
Fig. 5 a to Fig. 5 c is that in preferred embodiment of the present invention, touch-screen drives signal and feedback to drive the sequential chart of signal;
Fig. 6 is the schematic internal view of the second preferred embodiment of a kind of active electric capacity pen of the present invention;
Fig. 7 is the touch control detection of a kind of active electric capacity pen of the present invention and the flow chart of steps of feedback driving method.
Embodiment
Below, by specific instantiation accompanying drawings embodiments of the present invention, those skilled in the art can understand other advantage of the present invention and effect easily by content disclosed in the present specification.The present invention also can be implemented or be applied by other different instantiation, and the every details in this instructions also can be based on different viewpoints and application, carries out various modifications and change not deviating under spirit of the present invention.
Before explanation the present invention, the principle of work of touch-screen under first simple declaration.Fig. 1 is the structural representation of common touch-screen system.Touch-screen system comprises touch-screen, touch screen controller and main frame.Touch-screen includes many X-direction buss and many Y direction buss, and generalized case X-axis is vertical with Y-axis.The bus of X-axis forms mutual capacitance (mutual capacitor) array with the crossing place of Y-axis bus.Conducting objects when equivalent ground connection, such as human finger, when approaching or touching touch-screen, will change near the capacitance of the mutual capacitance of conducting objects, see through to detect these mutual capacitance and display the capacitance variation of each mutual capacitance, the position of the conducting objects that just can calculate equivalent ground connection by algorithm on touch-screen.
The present invention is applicable to mutual capacitance type and self-capacitance formula touch-screen simultaneously, take mutual capacitance type touch screen as example, mutual capacitance type touch screen controller can send touch-screen and drive signal can drive one by one drive electrode, drive electrode can be X-axis or Y-axis bus, it can be a set of pulses (pulse train) or one group of sinusoidal wave or one group of triangular waveform that touch-screen drives signal, etc. (in Fig. 1, only showing set of pulses waveform), a set of pulses comprises a plurality of pulses.The bus that there is no driven another axle is all detecting electrode.When a drive electrode is touched screen controller driving, drives signal can see through drive electrode and be coupled to detecting electrode with the mutual capacitance between detecting electrode.If have conducting objects contact or near drive electrode and detecting electrode, will change the capacitance of the mutual capacitance between drive electrode and detecting electrode.Touch screen controller see through to detect mutual capacitance display each mutual capacitance capacitance again with do not have conducting objects contact or near time capacitance comparison, just can draw capacitance variation image.Capacitance variation image can be passed to main frame and with algorithm, calculate the position of conducting objects.
Fig. 2 is the overall construction drawing of the active electric capacity pen that the present invention applied, and as shown in Figure 2, the active electric capacity pen that the present invention applied comprises nib, nib and a body.Fig. 3 is the structural representation of the first preferred embodiment of a kind of active electric capacity pen of the present invention, and Fig. 4 is the basic framework figure of signal processing module in the present invention's the first preferred embodiment.As shown in Figures 3 and 4, a kind of active electric capacity pen of the present invention, except power supply (being battery in preferred embodiment of the present invention), at least also comprises: conduction nib 10, a body, be imbedded in signal processing module 30 and a capacitor C in a body.
Wherein, conduction nib 10 adopts mechanical type contact to be connected with a body, its effect one is the instrument as point touching screen object region, the 2nd, the touch-screen that detects touch-screen transmitting as coupling device drives the feedback of signal and 30 outputs of transmitted signal processing module to drive signal, that is, conduction nib is not only as detecting electrode but also as drive electrode; Signal processing module 30 drives signal also to generate synchronous feedback driving signal for the treatment of the touch-screen of conduction nib 10 receptions, and the touch-screen that receives touch-screen in detection-phase drives signal, and sends treated feedback driving signal in the driving stage; Capacitor C is arranged between conduction nib 10 and signal processing module 30, when detecting, capacitor C drives signal to the input end of signal processing module 30 for the touch-screen that obtains of conduction nib 10 that is coupled, and when feedback drives touch-screen, capacitor C is used for isolation feedback driving signal.
During work, can the line by line scan drive electrode of touch-screen of touch screen controller, the drive electrode of every scanning a line touch-screen, controller can send a set of pulses to the drive electrode of touch-screen.Between conduction nib 10 meetings of active electric capacity pen and every detecting electrode on touch-screen, form coupling capacitance.The drive electrode of touch-screen is nearer apart from conduction nib, and the coupling capacitance between conduction nib and the detection utmost point of touch-screen is just larger.When the closer drive electrode of touch screen controller scanning distance conduction nib 10, the touch-screen that conduction nib 10 just can be coupled to sufficient intensity drives signal, this signal can be coupled to through capacitor C the input end of an active electric capacity signal processing module 30, and signal processing module 30 will be adjusted the intensity that feedback drives signal according to setting.The feedback of active electric capacity pen drives signal with the coupling capacitance between the detecting electrode on touch-screen, to drive signal coupling to the detecting electrode of touch-screen feedback through conduction nib 10.For the signal of the sufficient intensity that the is coupled detecting electrode to touch-screen, feedback drives signal sometimes to need high pressure, and such as 15v, correspondingly capacitor C also needs the withstand voltage 15v of reaching.Capacitor C in Fig. 3 can be built-in chip the inside or external in chip outside.Because electric capacity can not isolated AC signal, when the voltage of conduction nib is when rising, the other end of electric capacity, the voltage that is the input end of signal processing module 30 also can be followed rising, in order to prevent that high pressure is the circuit burnout of the input end of signal processing module, in the present invention's preferred embodiment, input end at signal processing module 30 increases holding circuit 305, this holding circuit 305 can be comprised of the diode of two or more parallel connected in reverse phase, one termination fixed-bias transistor circuit Vref, Vref is traditionally arranged to be half left and right of mimic channel supply voltage (if supply voltage is 5V, about 2.5v ± the 1.5v of Vref), the input end of this testing circuit 301 of another termination, so that when high pressure feedback drives signal to arrive, input terminal voltage at this testing circuit 301 will be limited in Vref ± Vd, Vd is diode threshold values.In addition, in order to strengthen active electric capacity pen, detect touch-screen driving signal, can add auxiliary detection electrode 50 in the input end selectivity of signal processing module.Auxiliary detection electrode 50 can be conductive pen point, or conductive stylus body, or wiring board track, or conductive metal wire.
Below illustrate the principle of work of signal processing module: when signal processing module 30 is during in detected state, the voltage of the input end of testing circuit 301 meeting detection signal processing modules 30, when detecting, testing circuit 301 when touch-screen drives the rising edge of signal or negative edge, outputs signal to control circuit 302, when signal processing module 30 is during in detected state, the output of feedback driving circuit 303 is high resistances, conduction nib 10 is in vacant state, so that 10 couplings of conduction nib are from the driving signal of touch-screen, the control circuit 302 of active electric capacity pen is received the output of testing circuit 301, control circuit 302 can control signal processing module 30 enter feedback driving condition, when feedback driving condition, the output meeting of testing circuit 301 is ignored by control circuit 302, feedback driving circuit 303 can finish high resistance output, control circuit 302 can be adjusted the intensity that feedback drives signal according to setting output, in preferred embodiment of the present invention, control circuit 302 adopts following methods adjustment feedback to drive the intensity of signal: change the time that drives signal to start and finish, change feedback and drive the rising edge of signal or the delay of negative edge, change the voltage that feedback drives signal, change the delay between rising edge and negative edge, or the delay between negative edge and rising edge, active electric capacity pen feedback drives and can before next touch-screen drives signal arrival, finish, signal processing module 30 can be got back to the detected state of beginning.
A complete active electric capacity pen should allow touch-screen accurately locate the position on touch-screen of conduction nib, and differentiating conducting objects is capacitance pen or finger.
Fig. 5 a to Fig. 5 c is that in preferred embodiment of the present invention, touch-screen drives signal and active electric capacity pen feedback to drive the sequential chart of signal.To coordinate Fig. 5 a to Fig. 5 c to do a detailed description to the detection of an active electric capacity signal processing module and feedback driving process below.
As Fig. 5 a, active electric capacity pen is close or touching touch-screen in use, touch screen controller is touch screen scanning drive electrode one by one, touch-screen drive electrode of every driving, touch screen controller can send one group of touch-screen and drive signal (as Fig. 5 a, the first waveform), and driving in the present embodiment signal is a set of pulses, but, driving signal can be also one group of triangular wave or one group of sine wave.Distant when the active electric capacity pen conduction of the driven electrode distance of touch-screen nib, the touch-screen drive signal strength that conduction nib is coupled to is more weak, and active electric capacity pen can't detect touch-screen and drives signal.During near touch-screen drive electrode touch screen controller drives conduction nib, conduction nib just can be coupled to relatively strong touch-screen and drive signal, pass through again capacitor C (Fig. 3) and signal coupling is arrived to the input end of an active electric capacity signal processing module 30, the input end of testing circuit 301 namely, when detecting touch-screen, testing circuit 301 drive signal testing result will be outputed to the control circuit 302 of an active electric capacity signal processing module, control circuit 302 will be controlled feedback driving circuit 303 and send feedback driving signal (as Fig. 5 a to touch-screen, the 3rd, four waveforms).
The second waveform in Fig. 5 a is that one group of touch-screen drives one of them touch-screen of signal to drive signal.This touch-screen drives signal to comprise a high level and a low level.When touch-screen drives signal at t
0while rising to high level by low level, touch-screen drive electrode has been done positive charge by the coupling capacitance between touch-screen drive electrode and touch-screen detecting electrode one time to all touch-screen detecting electrodes, and namely the voltage of touch-screen detecting electrode is drawn high.When driving signal at t
3while dropping to low level by high level, touch-screen drive electrode has been done a reverse charging to all touch-screen detecting electrodes, and namely the voltage of touch-screen detecting electrode is dragged down.Touch-screen detecting electrode will start electric discharge after punching electricity at every turn forward or backwards.The discharge scenario that touch screen controller will detect detecting electrode judges whether whether the coupling capacitance between drive electrode and detecting electrode changes, have conducting objects with near further judging.
Third and fourth waveform of Fig. 5 a is that the touch-screen of the second waveform drives the feedback of the active capacitance pen that signal is corresponding to drive signal.As third and fourth waveform shows, the signal processing module of active electric capacity pen is in detected state while starting, now, the output of feedback driving circuit 303 is high resistances, conduct electricity nib in vacant state, the driving signal that convenient conduction nib induction touch panel controller sends touch-screen drive electrode.(t after the testing circuit 301 of active electric capacity pen detects the rising edge that touch-screen drives signal
0), testing circuit 301 output signal notice control circuits 302 detect the rising edge that touch-screen drives signal.Control circuit 302 is controlled active electric capacity pen thereupon and is entered feedback driving condition.Control circuit 302 is according to setting, at certain (t that postpones
1) finish afterwards to feed back the high resistance output of driving circuit 303, with certain fall delay (t
1to t
2) feedback of sending positive (as Fig. 5 a, the 3rd waveform) or anti-phase (as Fig. 5 a, the 4th waveform) to touch-screen drives signal.Start time (Fig. 5 a, t that feedback drives
1), the end time (Fig. 5 a, t
2), the delay of rising edge or negative edge (Fig. 5 a, t
1to t
2), and feedback drives the voltage of signal also can adjust according to setting.Whole active electric capacity pen drives process can drive at touch-screen next negative edge (Fig. 5 a, the t of signal to the feedback of touch-screen
3) finish before.Active electric capacity Pen Association enters detected state again.From t
0to t
3, the signal processing module 30 of active electric capacity pen completes a detection and feedback drive cycle.
The feedback of active electric capacity pen drives the power of signal to feed back the time that starts and finish that drives by adjustment, feedback drives the delay of signal rising edge and negative edge, feedback drives the voltage of signal to realize, or the delay between same detection and feedback drive cycle the inside rising edge and negative edge, or the delay between same detection and feedback drive cycle the inside negative edge and rising edge.
In Fig. 5 b, as the 3rd of Fig. 5 b the, four waveforms show, the signal processing module of active electric capacity pen is in detected state while starting, now, the output of feedback driving circuit 303 is high resistances, conducts electricity nib in vacant state, the driving signal that convenient conduction nib induction touch panel controller sends touch-screen drive electrode.(t after the testing circuit 301 of active electric capacity pen detects the rising edge that touch-screen drives signal
0), testing circuit 301 output signal notice control circuits 302 detect the rising edge that touch-screen drives signal.Control circuit 302 is controlled active electric capacity pen thereupon and is entered feedback driving condition.Control circuit 302 is according to setting, at certain (t that postpones
1) finish afterwards to feed back the high resistance output of driving circuit 303, with certain rising or fall delay, to touch-screen, send N rising edge or the negative edge with the rising edge detecting or negative edge homophase, with N+1 and the rising edge detecting or anti-phase rising edge or the negative edge (as Fig. 5 b, the 4th waveform) of negative edge.Feedback drives the intensity of signal can see through to set and adjusts t
2, t
3and t
4.The process that whole feedback drives can drive at touch-screen next negative edge (Fig. 5 b, the t of signal
5) finish before.Active electric capacity Pen Association enters detected state again.From t
0to t
5, the signal processing module 303 of active electric capacity pen completes a detection and feedback drive cycle.
Fig. 5 c shows that another touch-screen drives signal.Fig. 5 c the first waveform shows one group of touch-screen drive waveforms, and what the second waveform showed is the waveform that a touch-screen drives signal.This touch-screen drives the waveform of signal also to have high level and low level, but touch screen controller unlike Fig. 5 a and Fig. 5 b during a touch-screen drive waveforms, when high level and low level, respectively by coupling capacitance, detecting electrode is done to once charging, but by switch, only detecting electrode is done once to charging forward or backwards during a drive waveforms.When using active electric capacity, active electric capacity pen near or touching touch-screen, during near drive electrode touch screen controller drives conduction nib, conduction nib just can be coupled to touch-screen driving signal.The control circuit 302 of active electric capacity pen is according to setting, at certain (Fig. 5 c, t of postponing
1) finish afterwards to feed back the high resistance output of driving circuit 303, with certain fall delay (Fig. 5 c, t1 is to t2) to touch-screen, send anti-phase (as Fig. 5 c, the 3rd waveform) or with certain rising delay (Fig. 5 c, t1 is to t2) feedback from positive (as Fig. 5 c, the 4th waveform) to touch-screen that send drives signal.The start time (Fig. 5 c, t1) that feedback drives, the end time (Fig. 5 c, t4), and feedback drives the voltage of signal to adjust according to setting.The process that whole feedback drives can be at next rising edge (Fig. 5 c, the t that drives signal of touch-screen
5) arrive and finish before.Active electric capacity Pen Association enters detected state again.From t
0to t
5, the signal processing module of active electric capacity pen completes a detection and feedback drive cycle.
Fig. 6 is the schematic internal view of the second preferred embodiment of a kind of active electric capacity pen of the present invention.As shown in Figure 6, in the second preferred embodiment of the present invention, the present invention's active electric capacity pen comprises: detecting electrode 601, drive electrode 602 and signal processing module 603; Detecting electrode 601 drives signal and is sent to signal processing module 603 for the touch-screen of induction touch panel transmitting; The touch-screen that signal processing module 603 receives for the treatment of detecting electrode 601 drives signal and produces synchronous feedback and drives signal; Feedback drives signal to be launched to touch-screen by drive electrode 602, under coordinating, realizes touch-screen location algorithm accurately location, in the present embodiment, drive electrode is conduction nib, and detecting electrode 601 can be conductive pen point, or conductive stylus body, or electric wire, or wiring board track, because signal processing module 603 is identical with the signal processing module structure function in the first preferred embodiment, do not repeat them here.
Fig. 7 is the flow chart of steps of the touch control detection of a kind of active electric capacity pen of the present invention and the first preferred embodiment of the method that feedback drives.As shown in Figure 7, the method that the touch control detection of a kind of active electric capacity pen of the present invention and feedback drive, comprises the steps:
Above-mentioned detection can continue the sequential chart with reference to Fig. 5 a with the process that feedback drives.Because the sequential of Fig. 5 a is describing in detail before, do not repeat them here.
The second preferred embodiment as the touch control detection of a kind of active electric capacity pen of the present invention and the method for feedback driving, in step 702, after described touch-screen driving signal being detected, active electric capacity pen sends feedback by drive electrode to described touch-screen and drives signal to enter feedback drive cycle, this feedback drives signal for drive rising edge or the negative edge of signal inversion or homophase with touch-screen, or N touch-screen drives signal with the rising edge or the negative edge that are added N+1 touch-screen driving signal inversion, or N touch-screen drives signal inversion to add rising edge or negative edge that N+1 touch-screen drives signal homophase, wherein, N is natural number, during feedback drives, the output of the testing circuit of this active capacitance pen is left in the basket.Concrete sequential as shown in Figure 5 b.
In step 702, if in a detection and feedback drive cycle, feedback drives signal to comprise over a rising edge or negative edge, feedback drives the intensity adjustment of signal to realize by the delay between the delay between rising edge and negative edge or negative edge and rising edge, and feedback drives signal to finish before next touch-screen drives the rising edge of signal or negative edge.
In sum, the method of a kind of active electric capacity pen of the present invention and touch control detection and driving, by testing circuit and feedback driving circuit are separated in sequential, effectively avoid signal processing module to form closed loop and produce self-sustained oscillation, it not only can accurately locate the position of active electric capacity pen conduction nib, and more easily to differentiate conducting objects be finger or active electric capacity pen, meanwhile, the present invention's active electric capacity pen can also drive signal according to feedback that set to transmit varying strength.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any those skilled in the art all can, under spirit of the present invention and category, modify and change above-described embodiment.Therefore, the scope of the present invention, should be as listed in claims.
Claims (8)
1. an active electric capacity pen, it is characterized in that: described active electric capacity pen comprises conduction nib, signal processing module and an electric capacity, described conduction nib drives signal and launches the feedback driving signal of described signal processing module output for detection of the touch-screen of touch-screen transmitting; The described touch-screen that described signal processing module receives for the treatment of described conduction nib drives signal and produces synchronous feedback and drives signal; Described electric capacity is arranged between described conduction nib and described signal processing module, when detecting, the described touch-screen that described electric capacity obtains for the described conduction nib that is coupled drives signal to the input end of described signal processing module, when feedback drives described touch-screen, described electric capacity is used for isolating described feedback and drives signal.
2. a kind of active electric capacity pen as claimed in claim 1, is characterized in that, this signal processing module comprises:
Testing circuit, the touch-screen of launching for detection of described touch-screen drives rising edge or the negative edge of signal;
Control circuit, when described testing circuit detects described touch-screen driving signal rising edge or negative edge, control described signal processing module and enter feedback driving condition by detected state, according to setting, adjust the voltage that the start and end time of described feedback driving signal or the delay of feedback driving signal rising edge and negative edge or feedback drive signal, described feedback drives signal to drive the rising edge of signal or negative edge to finish before arriving at next touch-screen, makes described signal processing module again enter detected state by driving condition;
Feedback driving circuit, this circuit adopts ternary output, and when detecting, it is output as high resistance makes described conduction nib in vacant state, when feedback drives, described feedback is driven signal to be sent to described conduction nib realization under described control circuit is controlled the feedback of described touch-screen is driven.
3. a kind of active electric capacity pen as claimed in claim 2; it is characterized in that: described signal processing module also comprises a holding circuit; described holding circuit is comprised of the diode of two or more parallel connected in reverse phase, one termination fixed-bias transistor circuit, the input end of testing circuit described in another termination.
4. a kind of active electric capacity pen as claimed in claim 2, it is characterized in that: described active electric capacity pen also comprises an auxiliary detection electrode, described auxiliary detection electrode is arranged at the input end of described signal processing module, to strengthen the detectability that described touch-screen is driven to signal.
5. the method that the touch control detection of active electric capacity pen and feedback drive, comprises the steps:
Step 1, active electric capacity pen detects the touch-screen driving signal of touch-screen transmitting in a detection and the sense cycle of feedback drive cycle by detecting electrode;
Step 2, after described touch-screen driving signal being detected, described active electric capacity pen sends feedback by drive electrode to described touch-screen and drives signal to enter described detection and the feedback drive cycle that feeds back drive cycle, described feedback drives the power of signal to be fed back and driven the start and end time of signal or the delay of feedback driving signal rising edge and negative edge or feedback to drive the voltage of signal to realize by adjustment, or by the delay between same detection and feedback drive cycle the inside rising edge and negative edge, or the delay between same detection and feedback drive cycle the inside negative edge and rising edge realizes, described feedback drive cycle finished before next touch-screen drives the rising edge of signal or negative edge, during feedback drives, the output of the testing circuit of described active capacitance pen is left in the basket.
6. the method that the touch control detection of active electric capacity pen and feedback drive, comprises the steps:
Step 1, active electric capacity pen detects the touch-screen driving signal of touch-screen transmitting in a detection and the sense cycle of feedback drive cycle by detecting electrode;
Step 2, after described touch-screen driving signal being detected, described active electric capacity pen sends feedback by drive electrode to described touch-screen and drives signal to enter described detection and the feedback drive cycle that feeds back drive cycle, described feedback drives signal for drive rising edge or the negative edge of signal inversion or homophase with described touch-screen, or N described touch-screen drives signal with N+1 described touch-screen of addition, to drive rising edge or the negative edge of signal inversion, or N described touch-screen drives signal inversion to add rising edge or negative edge that N+1 described touch-screen drives signal homophase, described N is natural number, described feedback drive cycle finished before next touch-screen drives the rising edge of signal or negative edge, during feedback drives, the output of the testing circuit of described active capacitance pen is left in the basket.
7. the method that the touch control detection of a kind of active electric capacity pen as claimed in claim 6 and feedback drive, it is characterized in that: if in a detection and feedback drive cycle, described feedback drives signal to comprise over a rising edge or negative edge, and described feedback drives the intensity adjustment of signal to realize by the delay between the delay between rising edge and negative edge or negative edge and rising edge.
8. an active electric capacity pen, is characterized in that: described active electric capacity pen comprises detecting electrode, drive electrode and signal processing module; Described detecting electrode drives signal and is sent to described signal processing module for the touch-screen of induction touch panel transmitting; The touch-screen that described signal processing module receives for the treatment of this detecting electrode drives signal and produces synchronous feedback and drives signal; Described feedback drives signal to be launched to described touch-screen by described drive electrode, under coordinating, realizes touch-screen location algorithm accurately location, described drive electrode utilizes conductive pen point or conductive stylus body or metal wire or wiring board track to make for conduction nib, described detecting electrode.
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