WO2013067810A1 - 位置指示装置及方法 - Google Patents
位置指示装置及方法 Download PDFInfo
- Publication number
- WO2013067810A1 WO2013067810A1 PCT/CN2012/076267 CN2012076267W WO2013067810A1 WO 2013067810 A1 WO2013067810 A1 WO 2013067810A1 CN 2012076267 W CN2012076267 W CN 2012076267W WO 2013067810 A1 WO2013067810 A1 WO 2013067810A1
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- WO
- WIPO (PCT)
- Prior art keywords
- circuit
- rectifying
- voltage dividing
- voltage
- resonant
- Prior art date
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
Definitions
- Electromagnetic induction type handwriting input technology has been widely used in practice.
- Electromagnetic induction handwriting input devices typically include an electromagnetic stylus and an electromagnetic position sensing input device. Further, the handwriting input device can be classified into a wired electromagnetic type, a wireless active type, and a wireless passive type depending on the relationship between the stylus pen and the position detecting input means. Among them, the wireless passive handwriting input device is the most convenient to use and is popular with users.
- the wireless passive stylus includes a resonant circuit composed of an inductor and a capacitor, which can sense the signal emitted by the position detecting input device to generate an oscillation. Then, the receiving circuit of the position detecting means receives the oscillating signal induced by the resonant circuit, thereby obtaining the position of the stylus relative to the position detecting input means.
- FIG. 1 is a circuit block diagram of a conventional digital stylus.
- the oscillating signal induced by the resonant circuit is rectified and filtered, and the power obtained by rectifying and filtering is the digital type.
- the stylus circuit is powered.
- the energy of the signal transmitted by the enhanced position detecting input device is generally used to enhance the signal energy induced by the resonant circuit in the stylus, thereby enhancing the voltage amplitude of the oscillating signal induced by the resonant circuit.
- the digital stylus since the digital stylus uses a large number of CMOS circuits, the current consumed by the CMOS circuit is nonlinearly related to the power supply voltage, and therefore, The relationship between the signal energy value transmitted by the position detecting input device shown in FIG. 2 and the power source voltage value of the stylus circuit is obtained. It can be seen from Fig. 2 that after the signal energy emitted by the position detecting input device exceeds the point A in Fig. 2, even if the signal energy emitted by the position detecting input device continues to increase a lot, the power supply voltage is increased little, resulting in the sensing of the resonant circuit. The voltage amplitude of the oscillating signal is also increased little.
- the power supply voltage value at point A is referred to as the operating voltage of the power source.
- the position detection accuracy can be continuously improved by increasing the operating voltage of the CMOS circuit, while the operating voltage of the CMOS circuit is increased, the sensitivity of the digital stylus is also reduced, and the process limitation of the existing CMOS circuit is The operating voltage of a CMOS circuit does not increase much.
- Embodiments of the present invention provide a position indicating device and method capable of improving the accuracy of detecting a position of a position indicating device without lowering the sensitivity of the position indicating device.
- a position indicating device includes a voltage dividing circuit, wherein the voltage dividing circuit is respectively connected to the resonant circuit and the rectifying and filtering circuit;
- the voltage dividing circuit acquires a signal of a predetermined ratio from a signal output from the resonant circuit, and outputs the signal to the rectifying and filtering circuit.
- a location indication method including:
- a signal of a predetermined ratio is obtained from the signal output from the resonance circuit, and is output to the above-described rectification filter circuit.
- the position indicating device and method provided by the embodiment of the present invention obtains a signal of a predetermined ratio from a signal output from the resonant circuit and outputs the signal to the rectifying and filtering circuit, so that the voltage across the resonant circuit and the voltage output by the rectifying and filtering circuit are proportional to a predetermined ratio. That is, the voltage amplitude of the sensing signal of the position indicating device is made to be proportional to the operating voltage of the CMOS circuit, so that the voltage amplitude of the sensing signal of the position indicating device can still be achieved when the operating voltage of the CMOS circuit is low. High value.
- the voltage amplitude of the sensing signal of the position indicating device is increased, so that the accuracy of the position of the detecting position indicating device can be improved without lowering the sensitivity of the position indicating device.
- FIG. 1 is a circuit block diagram of a prior art stylus.
- Fig. 2 is a graph showing the relationship between the signal energy value emitted by the position detecting input means and the power source voltage value of the stylus circuit.
- FIG. 3 is a circuit block diagram of a stylus according to an embodiment of the present invention.
- FIG. 4 is a circuit block diagram of another stylus according to an embodiment of the present invention.
- FIG. 5 is a circuit block diagram of another stylus according to an embodiment of the present invention.
- FIG. 6 is a circuit block diagram of another stylus according to an embodiment of the present invention.
- the embodiment of the present invention provides a position indicating device including a voltage dividing circuit, and the voltage dividing circuit and the resonant circuit respectively
- the rectifying and filtering circuit is connected; and the voltage dividing circuit obtains a signal of a predetermined ratio from a signal output from the resonant circuit, and outputs the signal to the rectifying and filtering circuit.
- the resonant circuit is composed of a capacitor and an inductor, and the resonant circuit can sense a signal emitted by the position detecting input device to generate an oscillating signal.
- the rectifying and filtering circuit receives the sub-piezoelectric After the signal output from the road, the signal is rectified and filtered to obtain a DC voltage as a power source for the rest of the circuit of the position indicating device.
- the remaining part of the circuit may be composed of a plurality of circuits, such as a processor, a resonant switch circuit, and the like.
- the position indicating device may be a digital stylus
- the position detecting input device matched thereto may be a product such as a tablet, a handwritten LCD screen or an electronic whiteboard.
- the voltage divider circuit can be implemented in a variety of ways.
- the voltage dividing circuit may be a circuit composed of two capacitors connected in series, and the voltage dividing circuit is connected in parallel with the resonant circuit. Further, one end of the rectifying and filtering circuit is connected to a connection point between the two capacitors, and the other end of the rectifying and filtering circuit is connected to the remaining part of the position indicating means.
- the voltage dividing circuit may be a circuit composed of two resistors connected in series, and the voltage dividing circuit is connected in parallel with the resonant circuit. Further, one end of the rectifying and filtering circuit is connected to a connection point between the two resistors, and the other end of the rectifying and filtering circuit is connected to the remaining part of the position indicating means.
- the voltage dividing circuit may be a circuit composed of two inductors connected in series, and the voltage dividing circuit is connected in parallel with the resonant circuit. Further, one end of the rectifying and filtering circuit is connected to a connection point between the two inductors, and the other end of the rectifying and filtering circuit is connected to the remaining part of the position indicating means.
- the voltage dividing circuit may be a circuit composed of an inductor having a center tap, and the voltage dividing circuit is connected in parallel with the resonant circuit. And, one end of the rectifying and filtering circuit is connected to a center tap of the inductor, and the other end of the rectifying and filtering circuit is connected to the remaining part of the position indicating device.
- the position indicating device obtains a signal of a predetermined ratio from a signal output from the resonant circuit and outputs the signal to the rectifying and filtering circuit, so that the voltage across the resonant circuit and the voltage output from the rectifying and filtering circuit are at a predetermined ratio. That is, the voltage amplitude of the sensing signal of the position indicating device is made to be proportional to the operating voltage of the CMOS circuit, so that the voltage amplitude of the sensing signal of the position indicating device can still be higher when the operating voltage of the CMOS circuit is low. Value.
- the voltage amplitude of the sensing signal of the position indicating device can be increased without lowering the sensitivity of the position indicating device, so that the accuracy of the position of the detecting position indicating device can be improved without lowering the sensitivity of the position indicating device.
- the voltage dividing circuit may be composed of two capacitors connected in series, or may be composed of two resistors connected in series, or may be composed of two inductors connected in series, or may be centered by a tap. An inductance component.
- the stylus is taken as an example, and the previous embodiment is further described in detail in combination with the above different situations.
- the embodiment provides a stylus pen, including a resonant circuit 101, a voltage dividing circuit 102, a rectifying and filtering circuit 103, a processor 104, a button detecting circuit 105, a pressure detecting circuit 106, and a resonant switch circuit 107.
- the resonant circuit 101 is composed of a capacitor and an inductor. One end of the resonant circuit 101 is grounded, and the other end is connected to the resonant switch circuit 107.
- the voltage dividing circuit 102 is connected in parallel with the resonant circuit 101.
- the voltage dividing circuit 102 includes a first capacitor C1 and a second capacitor C2.
- the first capacitor C1 is connected in series with the second capacitor C2, and the first capacitor C1 and the second capacitor are connected.
- the connection point between C2 is connected to the rectification filter circuit 103.
- the rectifying and filtering circuit 103 is connected to the processor 104, the key detecting circuit 105, and the pressure detecting circuit 106, respectively.
- the processor 104 is connected to the key detection circuit 105, the pressure detecting circuit 106, and the resonant switch circuit 107, respectively.
- the resonant circuit 101 senses a signal transmitted from the position detecting input device to generate an oscillating signal.
- the voltage dividing circuit 102 selects a part of the signal output from the middle of the capacitor to the rectifying and filtering circuit 103.
- the rectifying and filtering circuit 103 rectifies and filters the signal output from the voltage dividing circuit 102 to obtain a DC voltage, and the rectifying and filtering circuit 103 supplies power to the remaining circuits.
- the button detecting circuit 105 is for detecting whether the button is pressed, and transmitting the detection result to the processor 104.
- the pressure detecting circuit 106 is for detecting the magnitude of the pressure applied to the tip of the stylus and transmitting the detected pressure value to the processor 104.
- the processor 104 digitally encodes the detection results, and then controls whether the resonance circuit 101 oscillates through the resonance switch circuit 107 to transmit the digital code information to the position detection input device.
- the power supply voltage supplied from the rectifying and filtering circuit 103 is set to Vcc
- the peak value of the voltage amplitude of the induced signal of the resonant circuit 101 is set to Vs
- the voltage of the first capacitor C1 is Vs1.
- Vs (n+l)*Vsl
- Vcc Vsl
- CMOS device can be used to increase the sensitivity of the digital stylus, and as long as the ratio of the first capacitor C 1 to the second capacitor C2 is adjusted, the voltage amplitude of the stylus sensing signal can still be high. The value, which improves the accuracy of detecting the position of the stylus.
- the embodiment provides a stylus pen, including a resonant circuit 20 1 , a divided piezoelectric circuit 202 , a rectifying and filtering circuit 203 , a processor 204 , a button detecting circuit 205 , a pressure detecting circuit 206 , and a resonant switch circuit 207 .
- the resonant circuit 20 1 is composed of a capacitor and an inductor. One end of the resonant circuit 20 1 is grounded, and the other end is connected to the resonant switch circuit 207.
- the voltage dividing circuit 202 is connected in parallel with the resonant circuit 20 1 .
- the voltage dividing circuit 202 includes a first resistor R 1 and a second resistor R2 .
- the first resistor R 1 is connected in series with the second resistor R2 , and the first resistor R 1 A connection point with the second resistor R2 is connected to the rectifying filter circuit 203.
- the rectifying and filtering circuit 203 is connected to the processor 204, the key detecting circuit 205, and the pressure detecting circuit 206, respectively.
- the processor 204 is connected to the button detecting circuit 205, the pressure detecting circuit 206, and the resonant switch circuit 207, respectively.
- the resonance circuit 20 1 senses a signal transmitted from the position detecting input device to generate an oscillation signal.
- the voltage dividing circuit 202 selects a part of the signal output from the middle of the resistor to the rectifying and filtering circuit 203.
- the rectifying and filtering circuit 203 rectifies and filters the signal output from the voltage dividing circuit 202 to obtain a DC voltage, and the rectifying and filtering circuit 203 supplies power to the remaining circuits.
- the button detecting circuit 205 is for detecting whether the upper button is pressed, and transmitting the detection result to the processor 204.
- the pressure detecting circuit 206 is for detecting the magnitude of the pressure received by the pen tip of the stylus and transmitting the detected pressure value to the processor 204.
- the processor 204 receives the detection results and digitally encodes them, and then controls whether the resonance circuit 20 1 oscillates through the resonance switch circuit 207 to transmit the digital code information to the position detection input device.
- the power supply voltage supplied from the rectifying and filtering circuit 203 is set to Vc c
- the peak value of the voltage amplitude of the sensing signal of the resonant circuit 20 1 is set to Vs
- the voltage of the first resistor R 1 is Vs l .
- CMOS device can be used to increase the sensitivity of the digital stylus, and by adjusting the ratio of the first resistor R1 to the second resistor R2, the voltage amplitude of the stylus sensing signal can still reach a higher value. , thereby improving the accuracy of detecting the position of the stylus.
- the embodiment provides a stylus pen, including a resonant circuit 301, a divided piezoelectric circuit 302, a rectifying and filtering circuit 303, a processor 304, a button detecting circuit 305, a pressure detecting circuit 306, and a resonant switching circuit 307.
- the resonant circuit 301 is composed of a capacitor and an inductor. One end of the resonant circuit 301 is grounded, and the other end is connected to the resonant switch circuit 307.
- the voltage dividing circuit 302 is connected in parallel with the resonant circuit 301.
- the voltage dividing circuit 302 includes a first inductor L1 and a second inductor L2.
- the first inductor L1 is connected in series with the second inductor L2, and the first inductor L1 and the second inductor
- the connection point between L2 is connected to the rectification filter circuit 303.
- the rectifying and filtering circuit 303 is connected to the processor 304, the key detecting circuit 305, and the pressure detecting circuit 306, respectively.
- the processor 304 is connected to the key detection circuit 305, the pressure detecting circuit 306, and the resonant switch circuit 307, respectively.
- the resonant circuit 301 senses a signal transmitted by the position detecting input device to generate an oscillating signal.
- the voltage dividing circuit 302 selects a part of the signal output from the middle of the inductor to the rectifying and filtering circuit 303.
- the rectifying and filtering circuit 303 performs shaping filtering on the signal output from the voltage dividing circuit 302 to obtain a DC voltage, and the rectifying and filtering circuit 303 supplies power to the remaining circuits.
- the button detecting circuit 305 is configured to detect whether the upper button is pressed, and transmit the detection result to the processor 304.
- the pressure detecting circuit 306 is configured to detect the magnitude of the pressure received by the pen tip of the stylus and transmit the detected pressure value to Processor 304.
- the processor 304 receives the detection results and performs digital encoding, and then controls whether the resonant circuit 301 oscillates through the resonant switch circuit 307 to transmit the digitally encoded information to the position detecting input device.
- the power supply voltage supplied from the rectifying and filtering circuit 303 is set to Vcc
- the peak value of the voltage amplitude of the induced signal of the resonant circuit 301 is set to Vs
- the voltage of the first inductor L1 is Vs1.
- CMOS device can be used to increase the sensitivity of the digital stylus, and by adjusting the ratio of the first inductor L1 to the second inductor L2, the voltage amplitude of the stylus sensing signal can still reach a higher value. , thereby improving the accuracy of detecting the position of the stylus.
- the embodiment provides a stylus pen, including a resonant circuit 401, a voltage dividing circuit 402, a rectifying and filtering circuit 403, a processor 404, a button detecting circuit 405, a pressure detecting circuit 406, and a resonant switch circuit 407.
- the resonant circuit 401 is composed of a capacitor and an inductor. One end of the resonant circuit 401 is grounded, and the other end is connected to the resonant switch circuit 407.
- the voltage dividing circuit 402 is connected in parallel with the resonant circuit 401.
- the voltage dividing circuit 402 includes an inductor L having a center tap, and the center tap of the inductor L is connected to the rectifying and filtering circuit 403.
- the rectifying and filtering circuit 403 is connected to the processor 404, the key detecting circuit 405, and the pressure detecting circuit 406, respectively.
- the processor 404 is coupled to the key detection circuit 405, the pressure detection circuit 406, and the resonant switch circuit 407, respectively.
- the resonant circuit 401 senses a signal transmitted by the position detecting input device to generate an oscillating signal.
- the voltage dividing circuit 402 selects a part of the signal output from the middle of the inductor to the rectifying and filtering circuit 403.
- the rectifying and filtering circuit 403 performs shaping filtering on the signal output from the voltage dividing circuit 402 to obtain a DC voltage, and the rectifying and filtering circuit 403 supplies power to the remaining circuits.
- the button detecting circuit 405 is configured to detect whether the upper button is pressed, and transmit the detection result to the processor 404.
- the pressure detecting circuit 406 is for detecting the magnitude of the pressure received by the pen tip of the stylus and transmitting the detected pressure value to the processor 404.
- the processor 404 receives the detection results and performs digital encoding, and then controls whether the resonant circuit 40 1 oscillates through the resonant switch circuit 407 to transmit the digitally encoded information to the position detecting input device.
- the power supply voltage supplied from the rectifying and filtering circuit 403 is set to Vc c
- the peak value of the voltage amplitude of the sensing signal of the resonant circuit 40 1 is set to Vs
- the voltage of the first inductor L 1 is Vs l.
- CMOS device can be used to increase the sensitivity of the digital stylus, and by adjusting the ratio of the two sides of the center tap of the inductor L, the voltage amplitude of the stylus sensing signal can still reach a higher value. Thereby improving the accuracy of detecting the position of the stylus.
- the present invention further provides a position indication method, comprising: acquiring a signal of a predetermined ratio from a signal output from the resonance circuit, and outputting the signal to the rectifying and filtering circuit.
- two capacitors connected in series may be used as the voltage dividing circuit, and the voltage dividing circuit may be connected in parallel with the resonant circuit, and one end of the rectifying and filtering circuit may be connected to a connection point between the two capacitors.
- two resistors connected in series may be used as the above-mentioned voltage dividing circuit, and the piezoelectric transformer The circuit is connected in parallel with the resonant circuit, and one end of the rectifying and filtering circuit is connected to a connection point between the two resistors.
- two inductors connected in series may be used as the voltage dividing circuit, and the divided piezoelectric circuit and the resonant circuit may be connected in parallel, and one end of the rectifying and filtering circuit is connected to a connection point between the two inductors.
- the center tapped inductor may be used as the voltage dividing circuit, and the divided piezoelectric circuit and the resonant circuit may be connected in parallel, and one end of the rectifying and filtering circuit may be connected to the center tap of the inductor.
- the position indication method provided by the embodiment obtains a signal of a predetermined ratio from the signal output from the resonant circuit and outputs the signal to the rectifying and filtering circuit, so that the voltage across the resonant circuit is proportional to the voltage output by the rectifying and filtering circuit, that is, The voltage amplitude of the sensing signal of the position indicating device is proportional to the operating voltage of the CMOS circuit.
- the voltage amplitude of the sensing signal of the position indicating device can still reach a high value.
- the voltage amplitude of the sensing signal of the position indicating device can be increased without lowering the sensitivity of the position indicating device, so that the accuracy of the position of the detecting position indicating device can be improved without lowering the sensitivity of the position indicating device.
- the storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), or a Random Acc s Memory (RAM).
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- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Position Input By Displaying (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Description
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/270,720 US9696820B2 (en) | 2011-11-11 | 2012-05-30 | Position indication device and position indication method |
Applications Claiming Priority (2)
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CN201110358211.9 | 2011-11-11 | ||
CN201110358211.9A CN103105956B (zh) | 2011-11-11 | 2011-11-11 | 位置指示装置及方法 |
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WO2013067810A1 true WO2013067810A1 (zh) | 2013-05-16 |
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PCT/CN2012/076267 WO2013067810A1 (zh) | 2011-11-11 | 2012-05-30 | 位置指示装置及方法 |
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US (1) | US9696820B2 (zh) |
CN (1) | CN103105956B (zh) |
WO (1) | WO2013067810A1 (zh) |
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CN109240517B (zh) * | 2018-07-25 | 2022-02-22 | 北京汉王鹏泰科技股份有限公司 | 信号处理方法、装置、电磁笔及电磁感应系统 |
CN110446017A (zh) * | 2019-09-26 | 2019-11-12 | 深圳市利诺威科技有限公司 | 一种有源光纤hdmi连接装置 |
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- 2012-05-30 WO PCT/CN2012/076267 patent/WO2013067810A1/zh active Application Filing
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Publication number | Publication date |
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CN103105956A (zh) | 2013-05-15 |
US9696820B2 (en) | 2017-07-04 |
US20150324017A1 (en) | 2015-11-12 |
CN103105956B (zh) | 2015-05-06 |
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