WO2021209182A1 - Procédé de détection tactile capacitive et d'actionnement - Google Patents

Procédé de détection tactile capacitive et d'actionnement Download PDF

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Publication number
WO2021209182A1
WO2021209182A1 PCT/EP2021/054643 EP2021054643W WO2021209182A1 WO 2021209182 A1 WO2021209182 A1 WO 2021209182A1 EP 2021054643 W EP2021054643 W EP 2021054643W WO 2021209182 A1 WO2021209182 A1 WO 2021209182A1
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WO
WIPO (PCT)
Prior art keywords
potential
capacitance
capacitive
measuring
counter electrode
Prior art date
Application number
PCT/EP2021/054643
Other languages
German (de)
English (en)
Inventor
Florian Schmitt
Matthias Johannes
Original Assignee
Preh Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Preh Gmbh filed Critical Preh Gmbh
Publication of WO2021209182A1 publication Critical patent/WO2021209182A1/fr

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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
    • 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
    • H03K2017/9602—Touch switches characterised by the type or shape of the sensing electrodes
    • H03K2017/9604—Touch switches characterised by the type or shape of the sensing electrodes characterised by the number of electrodes
    • H03K2017/9613—Touch switches characterised by the type or shape of the sensing electrodes characterised by the number of electrodes using two electrodes per touch switch
    • 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
    • H03K2217/960725—Charge-transfer

Definitions

  • the present invention relates to the field of capacitive touch detection and, more particularly, to the field of the combination of capacitive touch detection and capacitive actuation detection.
  • the ideal actuation of a contact surface is understood to mean the action of an input element, such as an operator's finger, on the contact surface that is associated with the application of an actuation force, while ideal contact is understood to mean an arrangement of the input element adjacent to the contact surface without actuation force.
  • an action on the contact surface is understood as contact if the actuation force applied does not exceed a predetermined value
  • an action on the contact surface is understood as actuation if the actuation force applied in the process exceeds a predetermined value Value equals or exceeds this.
  • a metallic housing or shielding plate can have a parasitic capacitive effect on a capacitive touch sensor and the touch detection is impaired by movement of the touch sensor relative to this type of counter electrode.
  • US Pat. No. 8,836,350 B1 a method for determining a contact capacitance with the aid of a previously known reference capacitance is known in which the contact capacitance is determined by means of voltage measurements after a charge equalization has been carried out from the reference capacitance to the measuring capacitance and vice versa. It has been shown that the impairment of the capacitive touch detection by parasitic capacitive effects, which are caused by relative movements, can be minimized by means of a clever capacitive detection method and thus the reliability of the touch detection can also be increased overall.
  • the invention relates to a method for the capacitive detection of a touch by an operator by means of a capacitive touch sensor system.
  • the method provides for the provision of the capacitive touch sensor system.
  • the touch sensor system has at least one capacitive sensor which defines a touch surface facing the operator and a measuring capacitance, for example between a transmitting electrode and a receiving electrode.
  • the capacitive measuring field assigned to the measuring capacitance penetrates, for example, the contact surface.
  • a counter electrode is also provided, which is arranged on the side of the capacitive sensor facing away from the operator and is electrically insulated from the capacitive sensor.
  • the term counter electrode is to be interpreted broadly.
  • the capacitive sensor is integrated in an elastically yielding film layer structure that spans the counter electrode.
  • evaluation electronics belonging to the capacitive touch sensor system with a reference capacitance for example an integrated circuit containing a reference capacitor with a predetermined reference capacitance, are provided.
  • the evaluation electronics contain an analog-to-digital converter for providing one or more measured values, such as the first and second measured voltage mentioned below.
  • the evaluation electronics are designed to make selective electrical contact with the capacitive sensor and the counter electrode, for example in order to connect the capacitive sensor to the electrical reference capacitor in an electrically conductive manner with as little loss as possible in order to effect a charge equalization between the two to charge the reference capacitance, ie the reference capacitor with a predefined capacitance, of the evaluation electronics to a first charging potential, for example the predefined supply potential of the evaluation electronics.
  • the measuring capacitance is also brought to a predetermined potential, for example a second charging potential that differs from the first charging potential, for example to earth potential (GND).
  • the measuring capacitance is short-circuited to earth potential (GND) by the evaluation electronics.
  • the counter electrode is first applied with a first influencing potential, for example ground potential (GND).
  • a first charge equalization between the measuring capacitance and the reference capacitance is brought about by an electrically conductive (preferably loss-free) connection between the measuring capacitance and the reference capacitance, and the first measuring voltage applied to the measuring capacitance or the reference capacitance with the charge equalization is determined in a first determination step.
  • the charge equalization is an asymptotic approximation to a state of equilibrium and the point in time of the measurement should be selected accordingly after a sufficient approximation.
  • the method according to the invention has a second charging step with charging of the reference capacitance to a second charging potential which is different from the first different charging potential, preferably ground potential (GND).
  • a second charging potential which is different from the first different charging potential, preferably ground potential (GND).
  • the measuring capacitance is also brought to a predetermined, second potential, for example the first charging potential.
  • the counter electrode is subjected to a second influencing potential, for example the predefined supply potential of the evaluation electronics.
  • a second charge equalization opposite to the first charge equalization, is carried out between the measuring capacitance and the reference capacitance, the counter electrode being acted upon with the second influencing potential during the second charge equalization.
  • a third charge equalization which is also opposite to the first charge equalization, between the measuring capacitance and the reference capacitance, with the counterelectrode being subjected to the first influencing potential, for example the earth potential (GND), during this third charge equalization.
  • a second measurement voltage which occurs after the third charge equalization and is applied to the measurement capacitance or the reference capacitance, is determined.
  • the third charge equalization is an asymptotic approximation to a state of equilibrium and the point in time of the measurement should be selected accordingly after a sufficient approximation if necessary.
  • the evaluation electronics then carry out at least one mathematical operation with a first measurement voltage and a second measurement voltage, preferably forming a difference between the first and second measurement voltages in order to obtain a detection value.
  • the detection value is then evaluated by the evaluation electronics, for example compared with a predetermined value, in order to either trigger a contact event or not to trigger a contact event. For example, a touch event is triggered when the specified value is exceeded.
  • touch event is to be interpreted broadly and can include the generation of active haptic feedback or a switching or control function of an additional control device or a visual or acoustic output.
  • the method according to the invention has the advantage that the influence on the measuring capacitance caused by a change in the position of the capacitive sensor relative to the counter electrode can be compensated for by the fact that the charge equalizations taking place in a predetermined direction take place with different influences on the counter electrode and the resulting, here the second measuring voltage, is measured will.
  • a method according to the invention is also considered to be a method in which the first measurement voltage and the associated upstream first steps are determined after the second measurement voltage.
  • the counter electrode provided in the preparation step is a component of a capacitive force sensor system for measuring an actuation force on the contact surface.
  • the force sensor system has a capacitive force sensor, which by means of the counter electrode and one of the electrodes of the capacitive sensor, when appropriately controlled by the control electronics, forms an associated capacitive measuring field between the counter electrode and the electrode of the capacitive sensor and an associated measuring field on the distance between the capacitive sensor and the counter electrode dependent force measuring capacity defined.
  • the evaluation electronics trigger an active haptic feedback, an optical or acoustic output and / or a switching or control function.
  • the counter electrode extends at a distance from the array of capacitive sensors.
  • the array experiences, for example, elastic restoring displacement or elastic deformation, an approach to the counter-electrode that is regional or uniform over the entire array, provided that an actuating force acts on the contact surface.
  • the capacitive sensors are integrated into a film layer structure made of at least one elastic film, the film layer structure spanning the counter electrode.
  • the electrodes of the capacitive sensors arranged in the array are arranged, for example, in a common plane or on two or more parallel planes. These capacitive sensors arranged in the array form, for example, two groups of array electrodes.
  • array electrodes are arranged in groups, for example, essentially parallel to one another, whereby a group alignment is predetermined for each group.
  • the array electrodes are arranged in groups, ie alternating with regard to their group membership. In the case of an imaginary perpendicular projection onto a common plane, they cross one another, for example orthogonally, although they are actually arranged electrically isolated from one another.
  • a regular "lattice structure" is formed in the largest area in relation to the entire contact area, forming a so-called node at each point of intersection.
  • the smallest distance between the next adjacent node in the two directions defined by the group alignment describes the smallest periodicity of the lattice structure
  • the smallest distance between the nodes is usually the same in the two directions given by the group alignment.
  • the term electrode is intended to imply the formation of the relevant array electrode from conductive material, for example from metal or a metallic alloy.
  • the capacitive sensors have a projected capacitive structure, in particular a mutual capacitance structure. With the mutual capacitance structure, measuring capacitances, as described above, are generated at the nodes between two electrically isolated, intersecting array electrodes of the capacitive sensors. In commercially available touchpads or touchscreens, the nodes are arranged in a right-angled grid.
  • the measuring capacitance when the reference capacitance is first charged to the first charging potential, the measuring capacitance is brought to the second charging potential and when the reference capacitance is charged a second time to the second charging potential, the measuring capacitance is brought to the first charging potential.
  • a specified state of charge or potential is achieved on the measuring capacitance before the charge equalization and the reliability of the contact detection is increased.
  • the second influencing potential is applied to the counter electrode while the measuring capacitance is brought to the first charging potential. This advantageously results in the loading of the measuring capacitance under the influence of the counter electrode.
  • the method is preferably carried out cyclically, for example with a periodically continuous sequence of the steps described, with either the contact event being triggered or not triggered after the respective evaluation step, depending on the result of the evaluation.
  • the amount of the first influencing potential is less than the second influencing potential.
  • the first influencing potential is preferably earth potential (GND).
  • the second influencing potential corresponds to the first charging potential.
  • the first duration of the second charge equalization also called the first charge equalization period, preferably corresponds to the second duration of the third charge equalization, also called the second charge equalization period.
  • the invention also relates to the use of the method in one of the embodiments described above in a motor vehicle.
  • the invention also relates to a capacitive touch sensor system for detecting touch by an operator.
  • the capacitive touch sensor system has at least one capacitive sensor which defines a contact surface facing the operator and a measuring capacitance.
  • the capacitive touch sensor system comprises a counter electrode which is arranged on the soap of the capacitive sensor facing away from the operator and is electrically insulated from the capacitive sensor.
  • the capacitive sensor is mounted in relation to the counter electrode in such a way or designed in such a way that when the contact surface is actuated, that is, when The effect of an actuating force on the latter causes the capacitive sensor and the counter-electrode to come closer together, at least in some areas.
  • the capacitive touch sensor system also has evaluation electronics that contain a reference capacitance.
  • the evaluation electronics are able to selectively make electrical contact with the capacitive sensor and the counter electrode.
  • the touch sensor system is designed to carry out the method in one of the embodiments described above.
  • the counter electrode is a component of a capacitive force sensor system for measuring an actuation force on the contact surface.
  • the force sensor system has a capacitive force sensor, which by means of the counter electrode and one of the electrodes of the capacitive sensor, when appropriately controlled by the control electronics, forms an associated capacitive measuring field between the counter electrode and the electrode of the capacitive sensor and an associated measuring field on the distance between the capacitive sensor and the counter electrode dependent force measuring capacity defined.
  • the evaluation electronics trigger an active haptic feedback, an optical or acoustic output, and / or a switching or control function.
  • the counter electrode extends at a distance from the array of capacitive sensors.
  • the array is brought closer to the counter electrode, for example, through elastic resetting displacement or elastic deformation, in some areas or uniformly over the entire array, provided that an actuating force acts on the contact surface.
  • the capacitive sensors are integrated into a film layer structure made of at least one elastic film, the film layer structure spanning the counter electrode.
  • the electrodes of the capacitive sensors arranged in the array are arranged, for example, in a common plane or on two or more parallel planes.
  • These capacitive sensors arranged in the array form, for example, two groups of array electrodes, each of the array electrodes, for example, being selectively electrically contactable by the control electronics.
  • These array electrodes are arranged in groups, for example, essentially parallel to one another, whereby a group alignment is predetermined for each group.
  • the array electrodes are arranged in groups, ie alternating with regard to their group membership. In the case of an imaginary vertical projection onto a common plane, they intersect one another, for example orthogonally, although they are actually arranged electrically isolated from one another.
  • a regular "lattice structure" is formed in the largest area in relation to the entire contact area, forming a so-called node at each point of intersection.
  • the smallest distance between the next adjacent node in the two directions defined by the group alignment describes the smallest periodicity of the lattice structure
  • the smallest distance between the nodes is usually the same in the two directions given by the group alignment.
  • the term electrode is intended to imply the formation of the relevant array electrode from conductive material, for example from metal or a metallic alloy.
  • the capacitive sensors have a projected capacitive structure, in particular a mutual capacitance structure. With the mutual capacitance structure, measuring capacitances, as described above, are generated at the nodes between two electrically isolated, intersecting array electrodes of the capacitive sensors. In standard touchpads or touchscreens, the nodes are arranged in a right-angled grid.
  • FIG. 1 shows a sectional view of an embodiment according to the invention of the touch sensor system 1 according to the invention which has been provided;
  • FIG. 2 shows the temporal voltage curve U 0 (t) during a touch and a temporal voltage curve U F (t) when actuated, in each case when a variant of a method not according to the invention is carried out for the capacitive detection of a touch by an operator B;
  • FIG. 3 shows the temporal voltage profile U 0 (t) during a touch and a temporal voltage profile U F (t) when actuated, in each case when a variant according to the invention is carried out
  • FIG. 1 shows a sectional view through an embodiment of the capacitive touch sensor system 1 according to the invention.
  • the touch sensor system 1 has a plurality of capacitive sensors 2 arranged in an array.
  • the capacitive sensors 2 are integrated in an elastically yielding film layer structure 4 and each have a pair of electrodes made up of array electrodes 2a and 2b that are electrically isolated from one another.
  • the array of capacitive sensors 2 is assigned a contact surface 7 which is formed by a surface of the film layer structure 4 facing the operator B. This touch surface 7 is used to make touch inputs by the operator B, which can be detected spatially resolved by means of the array of capacitive sensors 2, the spatial resolution resulting from the spatial distribution of the capacitive sensors 2 and their selective control by the control electronics 5.
  • control electronics 5 are selectively electrically conductively connected to the array electrodes 2a and 2b of the capacitive sensors 2.
  • an array of measuring capacities defining several measuring capacities is generated, for example in chronological order, via the contact surface 7 the capacitance CT should be symbolized in FIG.
  • This influencing is evaluated by the control electronics 5 using the detection method described in US Pat. No. 8,836,350 B1, which is known as the so-called CVD method.
  • This procedure makes it easy to determine one by finger a change in capacitance caused by an operator B, since it is effected by means of a reference capacitance C R belonging to the control electronics 5 and by effecting opposing charge equalizations between the reference capacitance C R and the respective measuring capacitor.
  • the capacitive sensor (s) 2 experience a displacement; this is particularly critical if this takes place in an external field and thus the measuring capacity is influenced by this shift.
  • the origin of this external field is a counter-electrode 3, which is electrically isolated from the capacitive sensors 2 and at a varying distance Ad from them and extends along the entire array of capacitive sensors 2 is expanded by a force sensor.
  • This is provided, for example, to qualitatively or quantitatively detect the actuating force applied during an actuation in order to give the operator B active haptic, acoustic or visual feedback, for example when a minimum approach is exceeded.
  • a force measuring capacity is generated and determined between the electrodes 2a of the capacitive sensors 2 and the counter electrode 3.
  • the degree of variation of this force measuring capacity is a measure of the approach between the capacitive sensors 2 and the counter-electrode 3 and the variation of the distance Ad is ultimately a measure of the actuating force applied in the process.
  • Parallel measurement of the operation force, or more precisely the very existence of the counter electrode 3 presents a problem for the detection of a touch by the capacitive sensors.
  • the caused by the counter electrode 3 influence the measured capacitances of the capacitive sensors 2 is symbolized schematically p by the parasitic measuring capacitors C which, however, vary with a change in the distance Ad.
  • the voltage curve U 0 (t) to be measured on the measuring capacitor is a function of the time t when the operator touches it exclusively, that is to say without an actuation force and without a relative approach between the relevant one capacitive sensor 2 and the counter electrode 3 applied.
  • U F (t) is the voltage curve as a function of time t for a given actuation force applying actuation, i.e.
  • the CVD process first loads the evaluation electronics 5 associated reference capacitance C R predetermined by a reference capacitor, while the measuring capacitance is brought to ground potential, which takes place in FIG. 2 within the time segment marked with a.
  • a first charge equalization is effected between the reference capacitance C R and the measuring capacitance.
  • the voltage applied to the measuring capacitance at time t A is determined, which in the case of exclusive contact is U 0 (t A ) and its magnitude is greater than the voltage U F (t determined at the same time t A B ) for the case of an actuation in which the capacitive sensor 2 and the counter-electrode 3 have come closer due to the acting actuation force.
  • U 0 t A
  • U F t determined at the same time t A B
  • the measuring capacitance is charged to voltage V cc, conversely to time segment a , while the reference capacitance C R is held at ground potential.
  • a second charge equalization takes place in the opposite direction compared to time segment b.
  • the voltage applied to the measuring capacitance at time t B is determined, which in the case of exclusive contact is U 0 (t B ) and its absolute value is lower than the voltage U F (determined at the same time t B).
  • t B for the case of an actuation in which the capacitive sensor 2 and the counter electrode 3 have come closer due to the acting actuating force.
  • the measuring capacitance and the reference capacitance C R are brought to ground potential.
  • the method according to the invention also makes use of the so-called CVD method.
  • the voltage curve U 0 (t) to be measured on the measuring capacitor is plotted as a function of time t when the operator only touches it, ie without actuation force and without relative proximity between the capacitive sensor 2 and the counter electrode 3 in question.
  • U F (t) is the voltage profile as a function of time t in the case of an actuation applying a predetermined actuation force, i.e. with simultaneous relative proximity between the capacitive sensor 2 in question and the counter-electrode 3.
  • the influencing potential ⁇ (t) applied to the counter electrode 3 is plotted as a function of the time t.
  • the reference capacitance C R associated with the evaluation electronics 5 and specified by a reference capacitor is again first charged, while the measuring capacitance is held at ground potential (GND), at the same time the counter electrode 3 is also at ground potential (GND) as the first influencing potential ⁇ 1 held, which takes place in Figure 3 within the period marked with a.
  • a first charge equalization is effected between the reference capacitance C R and the measuring capacitance.
  • the voltage applied to the measuring capacitance at time t A is determined, which in the case of exclusive contact is U 0 (t A ) and its absolute value is greater than the voltage U F ( determined at the same time t A).
  • the duration of the second charge equalization in time segment d 1 corresponds approximately to the duration of the third Charge equalization in period d 2 .
  • the voltage applied to the measuring capacitance at time t B is determined, which for the case of exclusive contact is U 0 (t B ) and is now due to the measure of the previous curve or change in the influencing potential ⁇ ( t) is larger than the amount at the same point in time certain voltage U F (t B ) for the case of an actuation in which the capacitive sensor 2 and the counter electrode 3 have come closer due to the acting actuating force.
  • U F ground potential
  • the respective voltage values U (t A ) and U (t B ) are used here for the evaluation to trigger a contact event, for example by forming the difference and comparing it with a specified difference value
  • the problem is not that the absolute difference between these voltage values when actuated, namely ⁇ U F, and the absolute difference between these voltage values when exclusively touched, namely ⁇ U 0 from the absolute value, but that they approximate in terms of amount and thus, when actuated at the same time, there is no unwanted triggering of a A contact event, also called “ghost touch”, occurs because the approach of the counter electrode 3 and the capacitive sensor 2 has no amplifying effect on the contact detection due to the solution according to the invention.

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Abstract

L'invention concerne un procédé de détection tactile capacitive par un utilisateur (B) au moyen d'un système de capteurs tactiles capacitifs (1), ledit procédé comprenant les étapes suivantes, consistant : à utiliser un système de capteurs tactiles capacitifs (1) comprenant un capteur capacitif (2) définissant une surface tactile (7) faisant face à l'utilisateur (B) et une capacité de mesure, ainsi qu'une électrode auxiliaire (3), disposée sur le côté du capteur capacitif (2) orienté à l'écart de l'utilisateur (B) et électriquement isolée par rapport au capteur capacitif (2), ainsi qu'une unité électronique d'évaluation (5), présentant une capacité de référence (CR) et contactant électriquement et sélectivement le capteur capacitif (2) et l'électrode auxiliaire (3), lorsque la surface tactile est activée (7), une convergence étant provoquée entre le capteur capacitif (2) et l'électrode auxiliaire (3) ; à charger, une première fois, la capacité de référence (CR) à un premier potentiel de charge (Vcc) ; à appliquer, une première fois, un premier potentiel d'influence (ζ1) à l'électrode auxiliaire ; à réaliser une première égalisation de charges entre la capacité de meure et la capacité de référence (CR) ; à déterminer, une première fois, par l'unité électronique d'évaluation (5), la première tension de mesure de développement (U0(tA) ; UF(tA)) présente sur la capacité de mesure ou sur la capacité de référence (CR) ; à charger, une seconde fois, la capacité de référence (CR) à un second potentiel de charge (GND) qui diffère du premier potentiel de charge (Vcc) ; à appliquer, une seconde fois, un second potentiel d'influence (ζ2) à l'électrode auxiliaire (3) ; à réaliser une deuxième égalisation de charges, contre la première égalisation de charges, entre la capacité de mesure et la capacité de référence (CR) pendant que le second potentiel d'influence (ζ2) s'applique à l'électrode auxiliaire (3) ; à réaliser, après la première égalisation de charges, une troisième égalisation de charges, contre la première égalisation de charges, entre la capacité de mesure et la capacité de référence (CR), tandis que le premier potentiel d'influence (ζ1) est appliqué à l'électrode auxiliaire (3) ; à déterminer, par l'unité électronique d'évaluation, la seconde tension de mesure en développement (U0(tB) ; UF(tB)) présente sur la capacité de mesure ou sur la capacité de référence (CR) ; à effectuer une évaluation en réalisant une opération mathématique avec la première tension de mesure (U0(tA) ; UF(tA)) et avec la seconde tension de mesure (U0(tB) ; UF(tB)), afin d'obtenir une valeur de détection qui sert ensuite à déclencher un événement soit tactile soit non tactile.
PCT/EP2021/054643 2020-04-14 2021-02-25 Procédé de détection tactile capacitive et d'actionnement WO2021209182A1 (fr)

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DE102020110172.4 2020-04-14
DE102020110172.4A DE102020110172A1 (de) 2020-04-14 2020-04-14 Verfahren zur kapazitiven Berühr- und Betätigungsdetektion

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070089527A1 (en) * 2001-07-09 2007-04-26 Nartron Corporation Anti-entrapment system
US8836350B2 (en) 2009-01-16 2014-09-16 Microchip Technology Incorporated Capacitive touch sensing using an internal capacitor of an analog-to-digital converter (ADC) and a voltage reference
WO2016064438A1 (fr) * 2014-10-24 2016-04-28 Microchip Technology Incorporated Élimination analogique d'objets conducteur non mis à la terre en détection capacitive

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102017111253B4 (de) 2017-05-23 2020-10-01 Preh Gmbh Verfahren zur kapazitiven Berühr- und Betätigungsdetektion

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070089527A1 (en) * 2001-07-09 2007-04-26 Nartron Corporation Anti-entrapment system
US8836350B2 (en) 2009-01-16 2014-09-16 Microchip Technology Incorporated Capacitive touch sensing using an internal capacitor of an analog-to-digital converter (ADC) and a voltage reference
WO2016064438A1 (fr) * 2014-10-24 2016-04-28 Microchip Technology Incorporated Élimination analogique d'objets conducteur non mis à la terre en détection capacitive

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