Input devices including proximity sensor devices may be used in a variety of electronic systems. A proximity sensor device may include a sensing region, demarked by a surface, in which the proximity sensor device determines the presence, location, force and/or motion of one or more input objects. Proximity sensor devices may be used to provide interfaces for the electronic system. For example, proximity sensor devices may be used as input devices for larger computing systems, such as touchpads integrated in, or peripheral to, notebook or desktop computers. Proximity sensor devices may also often be used in smaller computing systems, such as touch screens integrated in cellular phones.
Additionally, proximity sensor devices may be implemented as part of a multimedia entertainment system of an automobile. In such cases, a knob may be interfaced to a proximity sensor device.
In an exemplary embodiment, the present disclosure provides a rotatable knob system. The rotatable knob system includes: a panel comprising a plurality of sensor electrodes; and a rotatable knob interface comprising a rotary wheel and a fixed base, wherein the fixed base comprises knob sensing electrodes and a ground pad. The knob sensing electrodes of the fixed base are disposed over the knob sensing electrodes of the plurality of sensor electrodes of the panel, and the ground pad is disposed over reference electrodes of the panel. The panel comprises a plurality of traces which connect the knob sensing electrodes of the panel to a processing system, and the plurality of traces connecting the knob sensing electrodes of the panel to the processing system do not overlap with the reference electrodes of the panel.
In a further exemplary embodiment, the panel is a touch-sensitive display panel.
In a further exemplary embodiment, the panel comprises a plurality of slices corresponding respectively to a plurality of analog front ends (AFEs), wherein the plurality of sensor electrodes of the panel include a first plurality of sensor electrodes corresponding to a first slice of the plurality of slices and a second plurality of sensor electrodes corresponding to a second slice of the plurality of slices.
In a further exemplary embodiment, the ground pad of the fixed base is disposed over the first slice, and wherein the knob sensing electrodes of the fixed base are disposed over the second slice.
In a further exemplary embodiment, the ground pad of the fixed base and the knob sensing electrodes of the fixed base are disposed in the same slice.
In a further exemplary embodiment, the knob sensing electrodes of the fixed base are disposed over the second slice; the system further comprises the processing system; and the processing system is configured to perform knob sensing via the knob sensing electrodes of the panel in a same time instance as performing touch sensing for the second slice.
In a further exemplary embodiment, the knob sensing electrodes of the fixed base are disposed over the second slice; the system further comprises the processing system; and the processing system is configured to perform knob sensing via the knob sensing electrodes of the panel in a time instance during which touch sensing is not performed.
In another exemplary embodiment, the present disclosure provides a rotatable knob system. The rotatable knob system includes: a panel comprising a plurality of sensor electrodes; and a rotatable knob interface comprising a rotary wheel and a fixed base, wherein the fixed base comprises knob sensing electrodes and a ground pad. The knob sensing electrodes of the fixed base are disposed over the knob sensing electrodes of the plurality of sensor electrodes of the panel, and the ground pad is disposed over reference electrodes of the panel. The panel comprises a first plurality of traces which connect the knob sensing electrodes of the panel to a processing system and a second plurality of traces which connect the reference electrodes of the panel to the processing system, wherein the second plurality of traces are separate from the first plurality of traces.
In a further exemplary embodiment, the panel is a touch-sensitive display panel.
In a further exemplary embodiment, the panel comprises a plurality of slices corresponding respectively to a plurality of analog front ends (AFEs), wherein the plurality of sensor electrodes of the panel include a first plurality of sensor electrodes corresponding to a first slice of the plurality of slices and a second plurality of sensor electrodes corresponding to a second slice of the plurality of slices.
In a further exemplary embodiment, the ground pad of the fixed base is disposed over the first slice, and wherein the knob sensing electrodes of the fixed base are disposed over the second slice.
In a further exemplary embodiment, the ground pad of the fixed base and the knob sensing electrodes of the fixed base are disposed in the same slice.
In a further exemplary embodiment, the knob sensing electrodes of the fixed base are disposed over the second slice; the system further comprises the processing system; and the processing system is configured to perform knob sensing via the knob sensing electrodes of the panel in a same time instance as performing touch sensing for the second slice.
In a further exemplary embodiment, the knob sensing electrodes of the fixed base are disposed over the second slice; the system further comprises the processing system; and the processing system is configured to perform knob sensing via the knob sensing electrodes of the panel in a time instance during which touch sensing is not performed.
In yet another exemplary embodiment, the present disclosure provides a method for knob sensing. The method includes: providing a rotatable knob interface on a panel of an input device, the knob interface having a fixed base and a rotary wheel, wherein the panel comprises a plurality of sensor electrodes, wherein the fixed base comprises knob sensing electrodes and a ground pad, wherein the knob sensing electrodes of the fixed base are disposed over the knob sensing electrodes of the plurality of sensor electrodes of the panel, and the ground pad is disposed over reference electrodes of the panel, wherein the panel comprises a plurality of traces which connect the knob sensing electrodes of the panel to a processing system, and wherein the plurality of traces connecting the knob sensing electrodes of the panel to the processing system do not overlap with the reference electrodes of the panel; providing, by a processing system of the input device, a reference signal to the reference electrodes of the panel and sensing signals to the knob sensing electrodes of the panel; obtaining, by the processing system, resulting signals via the knob sensing electrodes of the panel; and determining a change in rotational position and a direction of rotation of the knob interface based, at least in part, on the obtained resulting signals.
In a further exemplary embodiment, the panel comprises a plurality of slices corresponding respectively to a plurality of analog front ends (AFEs), wherein the plurality of sensor electrodes of the panel include a first plurality of sensor electrodes corresponding to a first slice of the plurality of slices and a second plurality of sensor electrodes corresponding to a second slice of the plurality of slices.
In a further exemplary embodiment, the ground pad of the fixed base is disposed over the first slice, and wherein the knob sensing electrodes of the fixed base are disposed over the second slice.
In a further exemplary embodiment, the ground pad of the fixed base and the knob sensing electrodes of the fixed base are disposed in the same slice.
In a further exemplary embodiment, the knob sensing electrodes of the fixed base are disposed over the second slice; and knob sensing is performed via the knob sensing electrodes of the panel in a same time instance as performing touch sensing for the second slice.
In a further exemplary embodiment, the knob sensing electrodes of the fixed base are disposed over the second slice; and knob sensing is performed via the knob sensing electrodes of the panel in a time instance during which touch sensing is not performed.
The following description may use perspective-based descriptions such as top/bottom, in/out, over/under, and the like. Such descriptions are merely used to facilitate the discussion and are not intended to restrict the application of embodiments described herein to any particular orientation.
The following description may use the phrases “in one embodiment,” or “in one or more embodiments,” or “in some embodiments”, which may each refer to one or more of the same or different embodiments. Furthermore, the terms “comprising,” “including,” “having,” and the like, as used with respect to embodiments of the present disclosure, are synonymous.
The terms “coupled with,” along with its derivatives, and “connected to” along with its derivatives, may be used herein, including in the claims. “Coupled” or “connected” may mean one or more of the following. “Coupled” or “connected” may mean that two or more elements are in direct physical or electrical contact. However, “coupled” or “connected” may also mean that two or more elements indirectly contact each other, but yet still cooperate or interact with each other, and may mean that one or more other elements are coupled or connected between the elements that are said to be coupled with or connected to each other. The term “directly coupled” or “directly connected” may mean that two or elements are in direct contact.
As used herein, including in the claims, the term “circuitry” may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group) and/or memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that provide the described functionality.
The electronic device 100 can be implemented as a physical part of the electronic system, or can be physically separate from the electronic system. As appropriate, the electronic device 100 may communicate with parts of the electronic system using any one or more of the following: buses, networks, and other wired or wireless interconnections. Example communication protocols include Inter-Integrated Circuit (I2C), Serial Peripheral Interface (SPI), Personal System/2 (PS/2), Universal Serial Bus (USB), Bluetooth®, Radio Frequency (RF), and Infrared Data Association (IrDA) communication protocols.
In one or more embodiments, the electronic device 100 may utilize any combination of sensor components and sensing technologies to detect user input. For example, as illustrated in
The sensor electrodes 125 may have any shape, size and/or orientation. For example, the sensor electrodes 125 may be arranged in a two-dimensional array as illustrated in
In one or more embodiments, some capacitive implementations utilize “self-capacitance” (or “absolute capacitance”) sensing methods based on changes in the capacitive coupling between sensor electrodes and an input object. In various embodiments, an input object near the sensor electrodes, such as, for example, finger or stylus 145, alters the electric field near the sensor electrodes 125, thus changing the measured capacitive coupling. In one implementation, an absolute capacitance sensing method operates by modulating sensor electrodes with respect to a reference voltage (e.g., system ground), and by detecting the capacitive coupling between the sensor electrodes and input objects.
Some capacitive implementations utilize “mutual capacitance” (or “transcapacitance”) sensing methods based on changes in the capacitive coupling between sensor electrodes. In various embodiments, an input object near the sensor electrodes alters the electric field between the sensor electrodes, thus changing the measured capacitive coupling. In one implementation, a transcapacitive sensing method operates by detecting the capacitive coupling between one or more transmitter sensor electrodes (also “transmitter electrodes” or “transmitters”) and one or more receiver sensor electrodes (also “receiver electrodes” or “receivers”). Transmitter sensor electrodes may be modulated relative to a reference voltage (e.g., system ground) to transmit transmitter signals. Receiver sensor electrodes may be held substantially constant relative to the reference voltage, or modulated with reference to the transmitter sensor electrodes to facilitate receipt of resulting signals. A resulting signal may comprise effect(s) corresponding to one or more transmitter signals, and/or to one or more sources of environmental interference (e.g., other electromagnetic signals). Sensor electrodes may be dedicated transmitters or receivers, or may be configured to both transmit and receive.
Capacitive sensing devices may be used for detecting input objects in proximity to and/or touching input devices. Further, capacitive sensing devices may be used to sense features of a fingerprint. Still further, as in the example of
Continuing with reference to
In some embodiments, the processing system 110 also comprises electronically-readable instructions, such as firmware code, software code, and/or the like. In some embodiments, components composing the processing system 110 are located together, such as, for example, near sensing element(s) of the electronic device 100. In other embodiments, components of processing system 110 are physically separate with one or more components in proximity to the sensing element(s) of electronic device 100, and one or more components elsewhere. For example, the electronic device 100 may be a peripheral coupled to a desktop computer, and the processing system 110 may comprise software configured to run on a central processing unit (CPU) of the desktop computer and one or more integrated circuits (ICs) (perhaps with associated firmware) separate from the CPU. As another example, the electronic device 100 may be physically integrated in a phone, and the processing system 110 may comprise circuits and firmware that are part of a main processor of the phone. Further yet, the processing system 110 may be implemented within an automobile, and the processing system 110 may comprise circuits and firmware that are part of one or more of the electronic control units (ECUs) of the automobile. In some embodiments, the processing system 110 is dedicated to implementing the electronic device 100. In other embodiments, the processing system 110 also performs other functions, such as operating display screens, driving haptic actuators, etc.
The processing system 110 may be implemented as one or more modules that operate different functions of the processing system 110 (e.g., driver module 140, or determination module 141). Each module may comprise circuitry that is a part of the processing system 110, firmware, software, or a combination thereof. In various embodiments, different combinations of modules may be used. Example modules include hardware operation modules for operating hardware such as sensor electrodes and display screens, data processing modules for processing data such as sensor signals and positional information, and reporting modules for reporting information. Further example modules include sensor operation modules configured to operate sensing element(s) to detect input, identification modules configured to identify gestures such as mode changing gestures, and mode changing modules for changing operation modes. In some embodiments, the electronic device 100 may be implemented as a chip, or as one or more chips. In some embodiments, the electronic device 100 may comprise a controller, or a portion of a controller, of electronic device 100.
In one or more embodiments, a display driver (e.g., driver module 140) may be configured for both display updating and input sensing, and may, for example, be referred to as including touch and display driver integration (TDDI) technology. In such embodiments, driver module 140 may be implemented as a TDDI chip, or a portion of a TDDI chip. In one or more embodiments, the electronic device may include matrix sensor and may also include TDDI technology.
In one or more embodiments, the processing system 110 further includes determination module 141. In one or more embodiments, the determination module 141 may be configured to determine changes in a capacitive coupling between each modulated sensor electrode and an input object, such as input objects 145, from the resulting signals. In one embodiment, all of sensor electrodes 125 may be simultaneously operated for absolute capacitive sensing, such that a different resulting signal is simultaneously received from each of the sensor electrodes or a common resulting signal from two or more sensor electrodes. In another embodiment, some of the sensor electrodes 125 may be operated for absolute capacitive sensing during a first period and others of the sensor electrodes 125 may be operated for absolute capacitive sensing during a second period that is non-overlapping with the first period.
In some embodiments, the processing system 110 responds to user input (or lack of user input) directly by causing one or more actions. Example actions include changing operation modes, as well as graphic user interface (GUI) actions such as cursor movement, selection, menu navigation, and other functions. In some embodiments, the processing system 110 provides information about the input (or lack of input) to some part of the electronic system (e.g., to a central processing system of the electronic system that is separate from the processing system 110, if such a separate central processing system exists). In some embodiments, some part of the electronic system processes information received from the processing system 110 to act on user input, such as to facilitate a full range of actions, including mode changing actions and GUI actions. Further, in some embodiments, the processing system 110 is configured to identify one or more objects, and the distance to these objects. In some embodiments the processing system 110 is configured to identify one or more rotational changes of knob interface 150, or one or more changes of state of knob interface 150, or both, and map those changes to desired actions.
For example, in some embodiments, the processing system 110 operates electrodes 125 to produce electrical signals (resulting signals) indicative of input (or lack of input) in a sensing region. The processing system 110 may perform any appropriate amount of processing on the electrical signals in producing the information provided to the electronic system. For example, the processing system 110 may digitize analog electrical signals obtained from the electrodes 125. As another example, the processing system 110 may perform filtering or other signal conditioning, or, as yet another example, the processing system 110 may subtract or otherwise account for a baseline, such that the information reflects a difference between the electrical signals and the baseline. As yet further examples, the processing system 110 may determine positional information, recognize inputs as commands, recognize handwriting, recognize fingerprint information, distance to a target object, and the like.
“Positional information” as used herein broadly encompasses absolute position, relative position, velocity, acceleration, and other types of spatial information. Exemplary “zero-dimensional” positional information includes near/far or contact/no contact information. Exemplary “one-dimensional” positional information includes positions along an axis. Exemplary “two-dimensional” positional information includes motions in a plane. Exemplary “three-dimensional” positional information includes instantaneous or average velocities in space. Further examples include other representations of spatial information. Historical data regarding one or more types of positional information may also be determined and/or stored, including, for example, historical data that tracks position, motion, or instantaneous velocity over time.
It should be understood that while many embodiments of the disclosure are described in the context of a fully functioning apparatus, the mechanisms of the present disclosure are capable of being distributed as a program product (e.g., software) in a variety of forms. For example, the mechanisms of the present disclosure may be implemented and distributed as a software program on information bearing media that are readable by electronic processors (e.g., non-transitory computer-readable and/or recordable/writable information bearing media readable by the processing system 110). Additionally, the embodiments of the present disclosure apply equally regardless of the particular type of medium used to carry out the distribution. Examples of non-transitory, electronically readable media include various discs, memory sticks, memory cards, memory modules, and the like. Electronically readable media may be based on flash, optical, magnetic, holographic, or any other storage technology.
In one or more embodiments, the processing system 110 is configured to generate a voltage signal to drive the electrodes 125 during a display update interval and an input sensing interval, respectively. In such embodiments, the voltage signal generated to drive the electrodes 125 during a display update interval is a substantially constant, or fixed voltage, and the voltage signal generated to drive the electrodes 125 during an input sensing interval may be referred to as a sensing signal, having a waveform with a periodically variable voltage. In one or more embodiments, the value of a voltage signal to drive the electrodes 125 during a display update interval may be predetermined. For example, the voltage value may be provided by a manufacturer of electronic device 100 and/or the electrodes 125, and may be device-specific to electronic device 100.
In one embodiment, the driver module 140 comprises circuitry configured to provide the sensing signal. For example, the driver module circuitry may include an oscillator, one or more current conveyers and/or a digital signal generator circuit. In one embodiment, the driver module circuitry generates the voltage signal based on a clock signal, the output of the oscillator and the parameters discussed above.
As noted above, in one or more embodiments, the driver module 140 generates a signal to drive the electrodes 125 during each of the display update periods and input sensing update periods. In such embodiments, an input sensing update period is provided in between two display update periods. In some implementations, the input sensing update period may be of a shorter duration than a display update period. In such embodiments, there are several display update periods and input sensing update periods per display frame. In one or more embodiments, by acquiring the resulting signals over successive input sensing periods the rotation of the rotatable knob interface 150, as well as whether it is in its home state or compressed state, may be tracked.
As noted above, in one or more embodiments, an additional input apparatus may be provided on top of the display panel 120 of the electronic device 100, such as, for example, the rotatable knob interface 150, and may be coupled to some or all of electrodes 125 that are positioned near or below it. In one or more embodiments, the additional apparatus may provide alternate ways for a user to provide input to electronic device 100 other than touching, or hovering near, a display screen with a finger or stylus 145. In the depicted example of
In one or more embodiments, the rotatable knob interface 150 also includes a rotary wheel that sits above, and rotates relative to, the stationary base. In such embodiments, an underside of the rotary wheel is patterned with various conductive and non-conductive regions in a peripheral region 152, configured to align with the conductive regions of the stationary base so that there are various electrical couplings between the conductive regions of the stationary base and the various conductive and non-conductive regions in the peripheral region 152 of the rotary wheel. These components are further configured such that these electrical couplings change as the rotary wheel is rotated, in such manner that by detecting the effects of the changes in the electrical couplings on resulting signals received on the display panel, the input device can determine a rotation, or a change in rotation, of the knob interface. In one or more embodiments, patterned region 152 may have numerous possible example arrangements of the conductive and non-conductive regions, and there may be various ways of having the rotary wheel and the stationary base electrically interact as the rotary wheel is rotated. Thus, alternate configurations and relative arrangements of both the conductive regions of the stationary base, and the placement of the conductive and non-conductive regions of the rotary wheel are possible, all being within the scope of this disclosure.
In one or more embodiments, the rotation imparted to the rotatable knob interface by a user, in either relative or absolute terms, may be detected by the electronic device 100. In one or more embodiments, the rotatable knob interface 150 may also be pressed downwards by a user, and may thus have two positions, a home, or “uncompressed” position, and a “compressed” position, which a user maintains by, for example, pushing down on the knob interface 150 against one or more biasing springs. In one or more embodiments, the rotatable knob interface 150 has a cover. In alternate embodiments, the rotatable knob interface may be pressed downwards so as to rest at multiple positions, and thus may have multiple states between an “uncompressed” and a “fully compressed” position. In the home position the cover is at a greater distance above the rotary wheel than in the compressed position. In one or more embodiments, the rotary wheel may have several switches provided between it and the cover, these switches may include the biasing springs. In such embodiments, the rotatable knob interface 150 may be provided with a fourth set of coupling electrodes, which couple to electrodes of the input device that are also driven with sensing signals. In the example of
It is noted that in one or more embodiments a user may rotate the rotatable knob interface 150 in various ways, for example, grabbing an outer housing of the rotatable knob interface and turning it, grabbing a top of the rotatable knob interface, or a flange protruding from the side of the rotatable knob interface and turning it, or placing one or more fingertips in or on a recessed channel on an upper surface of the rotatable knob interface.
In one or more embodiments, the electronic device 100 of
In alternate embodiments, all other forms of user input besides those received via the rotatable knob interface 150 may be disabled on the electronic device. Thus, in such embodiments, the electrodes 125 are not driven during the sensing interval to perform their standard sensing functionality. As a result, if a finger or other object 145 is moved into, or away from, its vicinity, no resulting signal is obtained, or if obtained, it is not processed. In such alternate embodiments, this may be done to prevent a driver of the automobile from attempting to touch the display 120 while driving, as a safety measure, and thus to only interact with the electronic device 100 via the rotatable knob interface 150. In such alternate embodiments, the disabling of standard sensing functionality of the electrodes 125 may be implemented during specified activities of the automobile, but not during others. For example, the disabling of standard sensing functionality of the electrodes 125 may be implemented while the automobile is in actual motion, but at all other times some of the electrodes 125, for example, those not near enough to the rotatable knob interface to interfere with signals acquired from it, may be operated to perform standard sensing, as described above.
Thus, in some alternate embodiments, when all of the electrodes 125 are disabled from standard sensing, whether during actual driving of the automobile, or whether at all times, as the case may be, the only way that a driver of the automobile can provide input to the electronic device 100 is via the rotatable knob interface 150, using a pre-defined set of rotations and/or pressings of the rotatable knob interface 150. These motions modify a resulting signal which is received by the electronic device 100 during a sensing period, which then interprets them, for example, using determination module 141. The resulting signal may be the same signal as the sensing signal that driver module 140 drives an electrode 125 with, after being modified by the capacitive coupling of the rotary knob interface 150.
In other alternate embodiments, for example, only some of the electrodes 125, in particular those that are near or beneath the rotary knob interface 150, are disabled from standard capacitive sensing, and the remainder of the electrodes 125 on the electronic device 100 may still be operative for standard capacitive sensing. In such alternate embodiments, the electrodes that are disabled for standard capacitive sensing are those that are close enough to the rotatable knob interface 150 such that driving them with standard sensing signals may interfere with the resulting signals obtained from various sets of the electrodes 125 that are respectively coupled to the coupling electrodes of the rotatable knob interface 150. To illustrate this feature, in
In general, within the blackout zone, a first, second and third set of the electrodes 125 are coupled to corresponding first, second and third sets of the coupling electrodes of the stationary base of the rotatable knob interface 150. In embodiments, the first set are driven with a reference signal, and the second and third sets are driven with a sensing signal to obtain a resulting signal modified by the then extant relative rotational relationship of the stationary base and the rotary wheel of the rotatable knob interface 150. Thus, in each of these alternate embodiments, all of the electrodes within the blackout zone boundary 155 may be disabled from standard capacitive sensing at all times.
As used herein, the term “disabled electrode” may refer to an electrode that is not driven at all, an electrode that is driven with a guard signal, or one that is driven with a constant signal.
Continuing with reference to
Continuing with reference to
Finally, continuing still with reference to
Continuing with reference to
Continuing further with reference to
Thus, as shown, for example, in
In the configuration shown in
For column-shaped slices (such as AFE_MUX1 through AFE_MUX6 of
It will be appreciated that the vertical traces of each respective AFE_MUX connect sensor electrodes of the respective AFE_MUX to a corresponding respective AFE of the processing system (e.g., processing system 110 of
It will be appreciated that
Exemplary embodiments of the present disclosure provide for improving the performance of knob sensing systems wherein a rotatable knob is disposed over a sensing array by avoiding undesirable capacitive couplings between grounded traces of the sensing array and other elements (including knob sensing electrodes and display source lines). Unlike conventional knob sensing systems in which grounded traces of the sensing array overlap with knob sensing electrodes, the fixed base of a rotatable knob in accordance with exemplary embodiments of the present disclosure is oriented and located relative to a sensing array so as to avoid such overlap (and may further be oriented and located to avoid or minimize capacitive coupling from grounded traces of the sensing array to display source lines).
To test the efficacy of exemplary embodiments of the present disclosure, SNR measurements were conducted in connection with an exemplary implementation of a rotatable knob system according to the present disclosure and a conventional rotatable knob system. Through these tests, the rotatable knob system according to the present disclosure was shown to have improved SNR relative to a conventional rotatable knob system (for the systems tested, the improvement was about 7-8 dB on average, corresponding to an SNR improvement of about 100-150%). Additionally, the two systems were also tested under different knob statuses (OFF/OFF and ON/ON) and under different image conditions (black image and white image), and it was demonstrated that, relative to a conventional rotatable knob system, the rotatable knob system according to the present disclosure avoided significant ADC shift corresponding to display image switching due to there being less loading on display source lines (ADC shift in this context refers to a shift in the values output by an analog-to-digital converter (ADC) of an AFE caused by capacitive loading on display source lines relative to baseline reference ADC values).
Method 900 includes blocks 910 through 950. In alternate embodiments, method 900 may have more, or fewer, blocks. Method 900 begins at block 910, where a rotatable knob interface is provided on an input device, the rotatable knob interface having a fixed base and a rotary wheel. The panel comprises a plurality of sensor electrodes, the fixed base comprises knob sensing electrodes and a ground pad, the knob sensing electrodes of the fixed base are disposed over the knob sensing electrodes of the plurality of sensor electrodes of the panel, and the ground pad is disposed over reference electrodes of the panel. The panel further comprises a plurality of traces which connect the knob sensing electrodes of the panel to a processing system, and the plurality of traces connecting the knob sensing electrodes of the panel to the processing system do not overlap with the reference electrodes of the panel. Further, the fixed base has first, second and third sets of coupling electrodes on a bottom surface, and a top surface with a peripheral portion including first second and third regions electrically connected to each of the first, second and third sets of coupling electrodes. The rotary wheel has a bottom surface provided with alternating conductive and non-conductive regions.
From block 910, method 900 proceeds to block 920, where the first set of coupling electrodes of the knob interface is capacitively coupled to a first set of electrodes of the input device configured to provide a reference signal. For example, the first set of electrodes may be electrodes 430 of
From block 920, method 900 proceeds to block 930, where the second and third sets of coupling electrodes of the knob interface are capacitively coupled to second and third sets of electrodes of the input device, the second and third sets of electrodes configured to receive a sensing signal. For example, the second and third sets of coupling electrodes may be the electrodes 410 and 411 of
From block 930, method 900 proceeds to block 940, where, at each of two different time points, the first set of electrodes of the input device is provided with a reference signal, and a resulting signal is then received on the second and third sets of electrodes of the input device. As noted above, the resulting signal is the same signal used to drive each of the second and third sets of electrodes, except that when it is measured, it has been modified by the relative rotational positions of the fixed base and rotary wheel of the rotatable knob interface. As noted, the second and third sets of electrodes of the input device may be driven with the same sensing signal.
From block 940, method 900 proceeds to block 950, where, based at least in part on the data obtained at each of the two different time points, a change in rotational position and a direction of rotation of the knob interface is determined. In one or more embodiments, this determination may be performed by firmware stored in a memory of the input device.
It will be appreciated that, as discussed above, blocks 920-950 of
All references, including publications, patent applications, and patents, cited herein are hereby incorporated by reference to the same extent as if each reference were individually and specifically indicated to be incorporated by reference and were set forth in its entirety herein.
The use of the terms “a” and “an” and “the” and “at least one” and similar referents in the context of describing the invention (especially in the context of the following claims) are to be construed to cover both the singular and the plural, unless otherwise indicated herein or clearly contradicted by context. The use of the term “at least one” followed by a list of one or more items (for example, “at least one of A and B”) is to be construed to mean one item selected from the listed items (A or B) or any combination of two or more of the listed items (A and B), unless otherwise indicated herein or clearly contradicted by context. The terms “comprising,” “having,” “including,” and “containing” are to be construed as open-ended terms (i.e., meaning “including, but not limited to,”) unless otherwise noted. Recitation of ranges of values herein are merely intended to serve as a shorthand method of referring individually to each separate value falling within the range, unless otherwise indicated herein, and each separate value is incorporated into the specification as if it were individually recited herein. All methods described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The use of any and all examples, or exemplary language (e.g., “such as”) provided herein, is intended merely to better illuminate the invention and does not pose a limitation on the scope of the invention unless otherwise claimed. No language in the specification should be construed as indicating any non-claimed element as essential to the practice of the invention.
Exemplary embodiments are described herein. Variations of those exemplary embodiments may become apparent to those of ordinary skill in the art upon reading the foregoing description. The inventors expect skilled artisans to employ such variations as appropriate, and the inventors intend for the invention to be practiced otherwise than as specifically described herein. Accordingly, this invention includes all modifications and equivalents of the subject matter recited in the claims appended hereto as permitted by applicable law. Moreover, any combination of the above-described elements in all possible variations thereof is encompassed by the invention unless otherwise indicated herein or otherwise clearly contradicted by context.
This application claims benefit to U.S. Provisional Patent Application No. 63/389,623, filed on Jul. 15, 2022, which is hereby incorporated by reference herein in its entirety.
Number | Date | Country | |
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63389623 | Jul 2022 | US |