WO2023021633A1 - Dac-generated driven shield and voltage reference - Google Patents
Dac-generated driven shield and voltage reference Download PDFInfo
- Publication number
- WO2023021633A1 WO2023021633A1 PCT/JP2021/030263 JP2021030263W WO2023021633A1 WO 2023021633 A1 WO2023021633 A1 WO 2023021633A1 JP 2021030263 W JP2021030263 W JP 2021030263W WO 2023021633 A1 WO2023021633 A1 WO 2023021633A1
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- WO
- WIPO (PCT)
- Prior art keywords
- signal
- capacitive sensor
- offset
- reference signal
- output
- Prior art date
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- 230000000737 periodic effect Effects 0.000 claims description 7
- 230000000295 complement effect Effects 0.000 claims description 5
- 230000015654 memory Effects 0.000 description 12
- 238000001514 detection method Methods 0.000 description 8
- 238000004590 computer program Methods 0.000 description 6
- 230000003071 parasitic effect Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- ZLIBICFPKPWGIZ-UHFFFAOYSA-N pyrimethanil Chemical compound CC1=CC(C)=NC(NC=2C=CC=CC=2)=N1 ZLIBICFPKPWGIZ-UHFFFAOYSA-N 0.000 description 1
- 239000010979 ruby Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/962—Capacitive touch switches
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/96—Touch switches
- H03K2217/9607—Capacitive touch switches
- H03K2217/96071—Capacitive touch switches characterised by the detection principle
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/96—Touch switches
- H03K2217/9607—Capacitive touch switches
- H03K2217/960755—Constructional details of capacitive touch and proximity switches
- H03K2217/960765—Details of shielding arrangements
Definitions
- the present disclosure relates to capacitive sensors, and more particularly to a reference signal generator for a capacitive sensor.
- An electronic device may implement a capacitive sensor configured to sense contact between an object (e.g., a finger) and a surface, such as a surface of the electronic device, and generate a sensed signal indicative of the sensed contact.
- a reference signal generator e.g., a waveform generator
- the sensed signal corresponds to changes in an amplitude and/or phase of the reference signal based on whether an object is contacting the sensor. Accordingly, the presence or absence of an object contacting the sensor can be determined based on the amplitude or phase of the sensed signal.
- the electronic device may include a driven shield circuit that receives the sensed signal and outputs a driven shield signal based on the sensed signal.
- the driven shield signal is provided to a driven shield of the capacitive sensor to prevent capacitive coupling between external objects and the capacitive sensor.
- the driven shield signal is coupled to the driven shield to match a voltage of the driven shield to a voltage of the capacitive sensor.
- a capacitive sensor system provides a solution to these technical problems by using a same reference signal supplied to the capacitive sensor as a driven shield signal and generating an offset signal in accordance with a rise timing of the reference signal to reduce the clipping of the sensed signal.
- capacitive sensor system includes a capacitive sensor including a sensing electrode and a shield electrode, a regulator circuit configured to regulate a voltage of the capacitive sensor and to generate an output signal based on an output of the capacitive sensor, a reference signal generator configured to generate a reference signal, supply the reference signal to the capacitive sensor via the regulator circuit, and supply the reference signal to the shield electrode as a driven shield signal, and an offset control module configured to generate an offset signal to modify an output current of the output signal.
- the regulator circuit includes a current conveyor coupled to the capacitive sensor.
- the current conveyor is configured to regulate the voltage of the capacitive sensor based on the reference signal supplied by the reference signal generator.
- the reference signal generator includes a digital-to-analog converter.
- the reference signal generator generates the reference signal as a periodic signal.
- the capacitive sensor generates the output as a sensed signal corresponding to the reference signal as modified in accordance with at least one of contact with and proximity of an object.
- the offset control module generates the offset signal such that a rise timing of the offset signal matches a rise timing of the output signal.
- the offset control module To generate the offset signal such that the rise timing of the offset signal matches the rise timing of the output signal, the offset control module generates the offset current at a rise timing of the reference signal.
- the regulator circuit generates the output signal as one of a stepped input signal and a ramped input signal.
- the reference signal generator is configured to generate the reference signal with a predetermined slope.
- the regulator circuit generates the output signal having a slope that corresponds to the predetermined slope of the reference signal.
- the regulator circuit generates the output signal with a positive slope and the offset control module generates the offset signal with a negative slope that is complementary to the positive slope of the output signal.
- long settling times of a voltage of the capacitive sensor and clipping of the sensed signal can be reduced.
- a change in a signal supplied to a capacitive sensor (corresponding to a sensed signal) in response to a contact with an object is typically small relative to a supplied signal (i.e., a drive, control, or reference signal) and may be difficult to detect. Accordingly, different methods may be implemented to improve detection of the change.
- a reference signal generator that provides the reference signal to the sensor may also supply a duplicate of the reference signal or a second reference signal generator can be provided to supply the duplicate of the reference signal. The duplicated signal is subtracted from the supplied signal and the result, which can be amplified to improve detection, corresponds to the sensed signal.
- the reference signal generator is a sinewave generator such as a Wien bridge oscillator.
- the reference signal generator may be configured to supply a digital sinewave to a digital-to-analog converter (DAC) and the output of the DAC is filtered and/or amplified.
- DAC digital-to-analog converter
- an offset control module is configured to generate an offset signal that is a duplicate of the sensed signal when there is no contact between an object and the capacitive sensor.
- an electronic device including the capacitive sensor may include a regulator circuit (e.g., a voltage-controlled current mode regulator) coupled to an output of the capacitive sensor.
- the regulator circuit is configured to regulate an output voltage corresponding to the reference signal and supplied to the capacitive sensor and generate an output current indicative of the sensed signal.
- an example capacitive sensor system 100 includes a detection circuit 104 and a driven shield circuit 108.
- the detection circuit 104 is configured to generate an output signal based on a sensed signal received from a capacitive sensor 110.
- the detection circuit 104 may include a timing circuit and/or other components configured to generate the output signal.
- the driven shield circuit 108 is configured to receive the sensed signal and output a driven shield signal based on the sensed signal.
- the driven shield circuit 108 includes an operational amplifier 112 and one or more resistors R as shown, and the driven shield signal is a buffered copy of the sensed signal.
- the driven shield signal is provided to a driven shield 116 of the capacitive sensor system.
- the driven shield 116 may be a conductive plate, sheet, etc. (i.e., a shield electrode) arranged to prevent capacitive coupling between external objects and the capacitive sensor 110.
- the driven shield signal is coupled to the driven shield 116 to match a voltage of the driven shield 116 to a voltage of the capacitive sensor 110.
- a capacitance associated with a parasitic capacitance between the capacitive sensor 110 and the driven shield 116 may be large relative to the sensed signal.
- the voltage of the capacitive sensor 110 may vary and has an associated settling time, there is an associated delay for the voltage of the driven shield 116 to match the voltage of the capacitive sensor 110 (i.e., the voltage of the driven shield 116 "follows" the voltage of the capacitive sensor 110 with an associated delay).
- the driven shield 116 reacts to each change in the voltage of the capacitive sensor 110.
- the sensing signal may be capacitively coupled to the driven shield 116, which triggers additional settling of both the capacitive sensor 110 and the driven shield 116.
- a capacitive sensing system generates a driven shield signal using a reference signal generator.
- the driven shield signal corresponds to a same reference signal provided to the capacitive sensor and to a regulator circuit as described below in more detail.
- the reference signal generator is a DAC configured to generate a periodic reference signal and output the reference signal to the regulator circuit, the capacitive sensor (e.g., via the regulator circuit), and the driven shield.
- a reference signal generator (e.g., a waveform generator) 208 supplies a reference or control signal (e.g., a square wave, a sinewave, etc.) 210 to the sensor module 204.
- the reference signal generator 208 further supplies the reference signal 210 to a driven shield of the sensor module 204 according to the principles of the present disclosure.
- the reference signal generator 208 may supply the reference signal 210 to an offset control module 212 or an optional second reference signal generator 216 may provide a duplicate of the reference signal 210 to the offset control module 212.
- the sensor module 204 modifies the reference signal 210 and generates a sensed signal 218 based on the reference signal 210 and proximity or contact with a sensed object.
- the sensed signal 218 corresponds to the reference signal 210 as modified in accordance with detection of (e.g., contact with and/or proximity of) an object.
- the sensed signal 218 is indicative of whether an object (e.g., a finger) is in contact with the sensor module 204.
- the sensed signal 218 indicates a proximity of the object to the sensor module 204.
- the sensed signal 218 may differ (e.g., in amplitude and/or phase) from the reference signal 210 regardless of whether an object is in contact with the sensor module 204.
- the offset control module 212 is configured to generate an offset signal 220 that is a duplicate of the sensed signal 218 without contact between an object and the sensor module 204.
- the offset control module 212 is configured to modify the reference signal 210 in the same manner as the sensor module 204 when there is no contact between an object and the sensor module 204 (and/or, in some examples, when the object is not sufficiently near the sensor module 204 to affect the sensed signal 218).
- the sensed signal 218 and the offset signal 220 will be essentially the same (e.g., in magnitude, phase, and/or both magnitude and phase) and a difference between the sensed signal 218 and the offset signal 220 will approach zero.
- the offset signal 220 may be configured to have an opposite polarity relative to the reference signal 210 and may simply be summed with the sensed signal 218.
- the output signal 228 (e.g., an output current) of the regulator circuit 224 indicative of the sensed signal 218 may then be processed to detect contact between the sensor module 204 and an object. For example, contact may be determined based on whether an amplitude and/or a phase of the output signal 228 exceeds a respective threshold.
- the sensed signal 218 may be indicative of a proximity of the object to the sensor module 204 regardless of whether the object is in direct contact with the sensor module 204.
- the sensed signal 218 may be further indicative of a distance between the object and the sensor module 204.
- the output signal 228 is provided to an output signal path (e.g., an output signal path of a capacitive sensor system of the electronic device 200).
- the output signal 228 is provided to an ADC via a sample-and-hold circuit.
- an amplitude control signal is provided to the LPF 240 to control the gain.
- the LPF 240 may be a first order filter to reduce cost or, in some examples, may be a second, third, or higher order filter. In other examples, a band pass filter may be used.
- an example capacitive sensor system 300 (e.g., a capacitive sensor system 300 for the electronic device 200) including a sensor module 304 (e.g., a capacitive sensor) and configured to supply a driven shield signal 308 to a driven shield 310 according to the present disclosure is shown.
- a reference signal generator 312 outputs a control or reference signal 316 (e.g., a modulated waveform such as a square wave, an analog sinewave, a digital waveform such as a digital sinewave that is converted to an analog sinewave, etc.).
- the reference signal generator 312 is a DAC configured to generate the reference signal 316.
- a capacitance 336 of the finger 332 further modifies the amplitude and phase of a sensed signal 340 that is based on the reference signal 316. Accordingly, the sensor module 304 generates, as an output voltage, the sensed signal 340 indicative of whether an object such as the finger 332 is in contact with the sensor module 304 or, in some examples, a proximity of the finger 332 to the sensor module 304. More specifically, the sensed signal 340 is modified in accordance with the detected capacitance 336.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electronic Switches (AREA)
Abstract
Description
104: detection circuit
108: driven shield circuit
110: capacitive sensor
112: operational amplifier
116: driven shield
200: electronic device
204: sensor module
208: reference signal generator
210: reference signal
212: offset control module
216: optional second reference signal generator
218: sensed signal
220: offset signal
224: regulator circuit
228: output signal
232: digital sinewave generator
236: analog DAC
240: LPF
244: multiplier
248: LPF
300: capacitive sensor system
304: sensor module
308: driven shield signal
310: driven shield
312: reference signal generator
316: reference signal
318: regulator circuit
320: offset control module
324: offset signal
328: sensing electrode
332: finger
336: capacitance
340: sensed signal
344: output signal
352: output voltage
356: ADC
400: stepped input signal
404: clipping threshold
412: clipping region
420: ramped offset signal
432: ramped input signal
Claims (15)
- A capacitive sensor system, comprising:
a capacitive sensor including a sensing electrode and a shield electrode;
a regulator circuit configured to regulate a voltage of the capacitive sensor and to generate an output signal based on an output of the capacitive sensor;
a reference signal generator configured to
generate a reference signal,
supply the reference signal to the capacitive sensor via the regulator circuit, and
supply the reference signal to the shield electrode as a driven shield signal; and
an offset control module configured to generate an offset signal to modify an output current of the output signal.
- The capacitive sensor system of claim 1, wherein the regulator circuit includes a current conveyor coupled to the capacitive sensor, wherein the current conveyor is configured to regulate the voltage of the capacitive sensor based on the reference signal supplied by the reference signal generator.
- The capacitive sensor system of claim 1, wherein the reference signal generator includes a digital-to-analog converter.
- The capacitive sensor system of claim 1, wherein the reference signal generator generates the reference signal as a periodic signal.
- The capacitive sensor system of claim 1, wherein the capacitive sensor generates the output as a sensed signal corresponding to the reference signal as modified in accordance with at least one of contact with and proximity of an object.
- The capacitive sensor system of claim 1, wherein the offset control module is coupled to an output of the regulator circuit to modify the output current of the output signal.
- The capacitive sensor system of claim 6, wherein the offset control module generates the offset signal as an offset current, and wherein the offset control module adds the offset current to the output current to reduce a magnitude of the output current.
- The capacitive sensor system of claim 7, wherein the offset control module adds the offset current to the output current to reduce the magnitude of the output current below a clipping region.
- The capacitive sensor system of claim 7, wherein the offset control module is configured to add the offset current to the output current while the output current increases from an initial value to a sensed input value.
- The capacitive sensor system of claim 7, wherein the offset control module generates the offset signal such that a rise timing of the offset signal matches a rise timing of the output signal.
- The capacitive sensor system of claim 10, wherein, to generate the offset signal such that the rise timing of the offset signal matches the rise timing of the output signal, the offset control module generates the offset current at a rise timing of the reference signal.
- The capacitive sensor system of claim 7, wherein the regulator circuit generates the output signal as one of a stepped input signal and a ramped input signal.
- The capacitive sensor system of claim 7, wherein the reference signal generator is configured to generate the reference signal with a predetermined slope.
- The capacitive sensor system of claim 13, wherein the regulator circuit generates the output signal having a slope that corresponds to the predetermined slope of the reference signal.
- The capacitive sensor system of claim 14, wherein the regulator circuit generates the output signal with a positive slope, and wherein the offset control module generates the offset signal with a negative slope that is complementary to the positive slope of the output signal.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2021/030263 WO2023021633A1 (en) | 2021-08-18 | 2021-08-18 | Dac-generated driven shield and voltage reference |
CN202180100370.0A CN118103716A (en) | 2021-08-18 | 2021-08-18 | DAC generated drive mask and voltage reference |
DE112021008122.5T DE112021008122T5 (en) | 2021-08-18 | 2021-08-18 | DAC-GENERATED DRIVEN SHIELD AND VOLTAGE REFERENCE |
KR1020247002752A KR20240026198A (en) | 2021-08-18 | 2021-08-18 | DAC generation drive shield and voltage reference |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2021/030263 WO2023021633A1 (en) | 2021-08-18 | 2021-08-18 | Dac-generated driven shield and voltage reference |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2023021633A1 true WO2023021633A1 (en) | 2023-02-23 |
Family
ID=85240236
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2021/030263 WO2023021633A1 (en) | 2021-08-18 | 2021-08-18 | Dac-generated driven shield and voltage reference |
Country Status (4)
Country | Link |
---|---|
KR (1) | KR20240026198A (en) |
CN (1) | CN118103716A (en) |
DE (1) | DE112021008122T5 (en) |
WO (1) | WO2023021633A1 (en) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5466896A (en) * | 1989-11-01 | 1995-11-14 | Murakami; Azuma | Position detector |
US6331780B1 (en) * | 1998-01-23 | 2001-12-18 | Sumitomo Metal Industries Ltd. | Static capacitance-to-voltage converter and converting method |
US20190257870A1 (en) * | 2018-02-16 | 2019-08-22 | Rohm Co., Ltd. | Capacitance detection circuit, semiconductor device, input device and electronic apparatus including the same, and method of detecting capacitance |
US20190294297A1 (en) * | 2016-12-21 | 2019-09-26 | Alps Alpine Co., Ltd. | Capacitance detection device and input device |
US20200019265A1 (en) * | 2016-07-29 | 2020-01-16 | Apple Inc. | Touch sensor panel with multi-power domain chip configuration |
US20210072048A1 (en) * | 2018-05-08 | 2021-03-11 | Nf Holdings Corporation | Capacitance measuring circuit and electrostatic capacitive displacement meter |
WO2021090636A1 (en) * | 2019-11-07 | 2021-05-14 | アルプスアルパイン株式会社 | Capacitance detection device and capacitance detection method |
WO2021106459A1 (en) * | 2019-11-29 | 2021-06-03 | 株式会社ジャパンディスプレイ | Sensor device and display apparatus |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5166679A (en) | 1991-06-06 | 1992-11-24 | The United States Of America As Represented By The Administrator Of The National Aeronautics & Space Administration | Driven shielding capacitive proximity sensor |
-
2021
- 2021-08-18 CN CN202180100370.0A patent/CN118103716A/en active Pending
- 2021-08-18 WO PCT/JP2021/030263 patent/WO2023021633A1/en active Application Filing
- 2021-08-18 DE DE112021008122.5T patent/DE112021008122T5/en active Pending
- 2021-08-18 KR KR1020247002752A patent/KR20240026198A/en unknown
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5466896A (en) * | 1989-11-01 | 1995-11-14 | Murakami; Azuma | Position detector |
US6331780B1 (en) * | 1998-01-23 | 2001-12-18 | Sumitomo Metal Industries Ltd. | Static capacitance-to-voltage converter and converting method |
US20200019265A1 (en) * | 2016-07-29 | 2020-01-16 | Apple Inc. | Touch sensor panel with multi-power domain chip configuration |
US20190294297A1 (en) * | 2016-12-21 | 2019-09-26 | Alps Alpine Co., Ltd. | Capacitance detection device and input device |
US20190257870A1 (en) * | 2018-02-16 | 2019-08-22 | Rohm Co., Ltd. | Capacitance detection circuit, semiconductor device, input device and electronic apparatus including the same, and method of detecting capacitance |
US20210072048A1 (en) * | 2018-05-08 | 2021-03-11 | Nf Holdings Corporation | Capacitance measuring circuit and electrostatic capacitive displacement meter |
WO2021090636A1 (en) * | 2019-11-07 | 2021-05-14 | アルプスアルパイン株式会社 | Capacitance detection device and capacitance detection method |
WO2021106459A1 (en) * | 2019-11-29 | 2021-06-03 | 株式会社ジャパンディスプレイ | Sensor device and display apparatus |
Also Published As
Publication number | Publication date |
---|---|
CN118103716A (en) | 2024-05-28 |
DE112021008122T5 (en) | 2024-05-29 |
KR20240026198A (en) | 2024-02-27 |
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