Patent Description:
As functions of mobile devices have become increasingly diverse, the mobile devices have been implemented in the form of multimedia devices, and structural and software parts of the devices have been improved. Recently, among various mobile devices, the use of wearable devices such as smart watches, smart glasses, head mounted displays (HMDs), smart rings, and the like has been increasing. Among them, a smart ring worn on a user's finger is sometimes used alone, but due to its very small size, the smart ring often performs various operations in conjunction with other electronic devices.

On the other hand, input methods through the smart ring are limited. The user may control a smart ring using a voice command or via a touch input. However, when controlling a smart ring via a touch input, there is a limit in distinguishing between various input signals or providing precise manipulation due to the small area of the smart ring. Therefore, a technology for enabling control of more operations in a limited touch area is required.

<CIT> describes a wearable ring device with ring-shaped electrodes arranged in parallel and an impedance measurement unit to detect inter-finger contact.

An embodiment of the present disclosure may provide a wearable device and method capable of identifying a body part touching the wearable device worn on a user's finger by measuring an impedance between an inner surface electrode and an outer surface electrode.

An embodiment of the present disclosure may provide a wearable device and method capable of controlling two or more operations even when the same pattern of touch input is received by matching different operations with different types of body parts that touch wearable device worn on a user's finger and capable of controlling various operations in a limited touch area.

Technical problems to be solved by an embodiment of the present disclosure are not limited to the above technical problems, and other technical problems may be inferred from the following embodiments of the present disclosure.

According to the present disclosure, as a solution to the technical problem, a method of controlling a wearable device worn on a finger of a user may include sensing a contact by a second finger of the user via an outer surface electrode located on an outer circumferential surface of the wearable device worn on a first finger of the user, measuring, in response to the sensing of the contact, an impedance between the outer surface electrode and an inner surface electrode that is in contact with the first finger of the user, identifying a type of the second finger based on the measured impedance, and controlling an operation of the wearable device based on the identified type of the second finger.

According to the present disclosure, as a solution to the technical problem, a wearable device for obtaining a control signal may include a body portion including at least one passage insertion hole, an inner surface electrode located on an internal surface of the body portion, an outer surface electrode located on an external surface of the body portion, a power source, a storage storing a program including at least one instruction, and at least one processor configured to execute the at least one instruction stored in the storage. The at least one processor may be configured to execute the at least one instruction to sense a contact by a second finger of a user via the outer surface electrode, measure, in response to the sensing of the contact, an impedance between the outer surface electrode and an inner surface electrode that is in contact with a first finger of the user, identify a type of the second finger based on the measured impedance, obtain a touch input from the contact by the second finger of the user, identify a pattern of the touch input, identify an operation corresponding to the identified pattern of the touch input and the identified type of the second finger, and obtain a control signal for the identified operation.

According to the present disclosure, as a solution to the technical problem, a computer-readable recording medium may have stored therein a program for executing, on a computer, at least one of the methods according to embodiments of the disclosure.

Embodiments of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings so that they may be easily implemented by one of ordinary skill in the art. However, the present disclosure may be implemented in different forms and is limited to the embodiments set forth herein. In addition, parts not related to descriptions of the present disclosure are omitted to clearly explain the present disclosure in the drawings, and like reference numerals denote like elements throughout the specification.

As the terms used herein, general terms that are currently widely used are selected by taking functions according to the present disclosure into account, but may be changed according to the intention of one of ordinary skill in the art, precedent cases, or advent of new technologies. Furthermore, specific terms may be arbitrarily selected by the applicant, and in this case, the meaning of the selected terms will be described in detail in the detailed description of a corresponding embodiment. Thus, the terms used herein should be defined not by simple appellations thereof but based on the meaning of the terms together with the overall description of the present disclosure.

Singular expressions used herein are intended to include plural expressions as well unless the context clearly indicates otherwise. All the terms used herein, which include technical or scientific terms, may have the same meaning that is generally understood by one of ordinary skill in the art.

Throughout the present disclosure, when a part "includes" or "comprises" an element, unless there is a particular description contrary thereto, the part may further include other elements, not excluding the other elements. Furthermore, terms, such as "portion," "module," etc., used herein indicate a unit for processing at least one function or operation and may be embodied as hardware or software or a combination of hardware and software.

Throughout the specification, it will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be "directly connected" to or "electrically coupled" to the other element with one or more intervening elements therebetween.

The expression "configured to (or set to)" used herein may be used interchangeably, according to context, with, for example, the expression "suitable for," "having the capacity to," "designed to," "adapted to," "made to," or "capable of". The term "configured to (or set to)" may not necessarily mean only "specifically designed to" in terms of hardware. Instead, the expression "a system configured to" may mean, in some contexts, the system being "capable of", together with other devices or components. For example, the expression "a processor configured to (or set to) perform A, B, and C" may mean a dedicated processor (e.g., an embedded processor) for performing the corresponding operations, or a general-purpose processor (e.g., a central processing unit (CPU) or an application processor (AP)) capable of performing the corresponding operations by executing one or more software programs stored in a memory.

In the present disclosure, 'impedance (Z)' may represent a sum of resistances undergone when an electrical signal passes through a circuit or device. For example, impedance may be a value of opposition to a flow of current in a circuit when a voltage is applied. The value of impedance may be expressed as a ratio between voltage and current across the circuit and depend on a frequency of an alternating current (AC) voltage. Impedance may be represented as a complex number and have a unit of Ohm (Ω).

Hereinafter, the present disclosure is described in detail with reference to the accompanying drawings.

<FIG> is a schematic diagram illustrating a method of identifying a type of a second finger F2 of a user touching a wearable device <NUM> and controlling the wearable device <NUM> worn on a first finger F1 of the user based on the identified type of the second finger F2, according to an embodiment of the present disclosure.

Referring to <FIG>, the wearable device <NUM> may include a smart ring, and the wearable device <NUM> of a ring type may be worn on the first finger F1 of the user. In an embodiment, the wearable device <NUM> may have a cylindrical shape or a donut shape. A surface of the wearable device <NUM> having a cylindrical shape may be divided into an inner circumferential surface (internal surface) in the direction of the finger on which the wearable device <NUM> is worn and an outer circumferential surface (external surface) in the opposite direction of the finger. The wearable device <NUM> may be worn on one finger or may be worn across a plurality of fingers.

In an embodiment, a touch sensor may be included on the external surface of the wearable device <NUM> to sense a contact by a part of a user's body and receive a touch input from the user. For example, the touch sensor may include a touch screen. The user may touch the external surface of the wearable device <NUM> worn on the first finger F1 with the second finger F2. A touch input may be generated when the user touches the external surface of the wearable device <NUM> with the second finger F2.

An operation in which the user touches the wearable device <NUM> with the second finger F2 may be classified into at least two types. In a first type 1a, the user may touch the external surface of the wearable device <NUM> by using a second finger F2 of the same hand as a first finger F1 on which the wearable device <NUM> is worn. In a second type 1b, the user may touch the external surface of the wearable device <NUM> by using a second finger F2 of a different hand than a first finger F1.

In a method of controlling the wearable device <NUM> worn on a finger of the user based on a touch input, according to an embodiment of the present disclosure, the wearable device <NUM> may distinguish between types 1a and 1b of the second finger F2 that generate touch inputs and identify different control commands respectively corresponding to the touch inputs generated by the different types 1a and 1b of the second finger F2. As described in detail below, by distinguishing between the types 1a and 1b of the second finger F2 that generate touch inputs, various operations of the wearable device <NUM> and another electronic device connected thereto may be controlled even through a limited touch area.

<FIG> is a flowchart of a method of controlling a wearable device worn on a finger of a user, according to an embodiment of the present disclosure.

In operation S210, a touch input from a user touching a wearable device may be sensed. For example, a contact by a second finger F2 of the user may be sensed via an outer surface electrode positioned on an outer circumferential surface of the wearable device worn on the first finger F1 of the user.

The wearable device may be worn on a first finger F1 of the user. In an embodiment, when the user wears the wearable device on the first finger F1, an internal surface (inner circumferential surface) of the wearable device may contact the first finger F1. In an embodiment, when the user wears the wearable device across a plurality of first fingers F1, the inner circumferential surface of the wearable device may contact at least one of the plurality of first fingers F1. In an embodiment, at least one inner surface electrode may be positioned on the inner circumferential surface of the wearable device. In this case, the at least one first finger F1 on which the wearable device is worn may contact at least one inner surface electrode included in the wearable device.

The user may touch the outer circumferential surface of the wearable device worn on the first finger F1 with the second finger F2. When the user touches the wearable device with the second finger F2, the contact by the second finger F2 may be sensed. In an embodiment, an outer surface electrode may be positioned on the outer circumferential surface of the wearable device. In an embodiment, an operation of the user touching the outer circumferential surface of the wearable device with the second finger F2 may include an operation of touching the outer surface electrode positioned on the outer circumferential surface with the second finger F2. For example, when the user touches the outer surface electrode included in the wearable device with the second finger F2, the contact by the second finger F2 may be sensed. In an embodiment, the wearable device may obtain a touch input from the contact by the second finger F2 of the user.

In operation S220, in response to the contact by the second finger F2 of the user being sensed, an impedance Z between the outer surface electrode and an inner surface electrode in contact with the first finger F1 of the user may be measured. For example, the wearable device may measure impedance Z through a user's body between the user's first finger F1 contacting the inner surface electrode and the user's second finger F2 contacting the outer surface electrode.

In an embodiment, an impedance measuring portion may be included between the outer surface electrode and the inner surface electrode on the inside of the wearable device. For example, the impedance measuring portion may include at least one of a voltmeter and an ammeter.

In an embodiment, when parts of the user's body respectively contact the outer surface electrode and the inner surface electrode, a closed circuit is formed that includes the inner surface electrode, the impedance measuring portion, the outer surface electrode, and the user's body. A current emitted by the wearable device via the inner surface electrode or outer surface electrode may flow through the formed closed circuit, or a current may flow due to a voltage difference between the inner surface electrode and outer surface electrode. By measuring the current flowing in the closed circuit or by measuring a voltage applied between the inner surface electrode and the outer surface electrode, the impedance measuring portion may measure a body impedance Z due to the inner surface electrode and the outer surface electrode respectively contacting parts of the user's body.

In operation S230, a type of the second finger F2 may be identified based on the measured impedance. For example, the type of the second finger F2 may include a first type TYPE1 and a second type TYPE2. In an embodiment, the first type TYPE1 and the second type TYPE2 may be determined based on whether the second finger F2 performing the touch operation is on the same hand as the first finger F1 on which the wearable device is worn. The second finger F2 that is of the first type TYPE1 may belong to the same hand as the first finger F1. The second finger F2 that is of the second type TYPE2 may belong to a different hand than the first finger F1.

For example, if the user wears the wearable device on the index finger on the right hand, the first finger F1 is the index finger on the right hand. In this case, the other fingers on the user's right hand, except for the index finger, may be of the first type TYPE1, and the fingers on the user's left hand may be of the second type TYPE2.

In operation S240, an operation of the wearable device may be controlled based on the identified type of the second finger F2. In an embodiment, the wearable device may be controlled to generate a control signal for controlling the wearable device itself being worn or another electronic device connected thereto via a network according to the identified type of the second finger F2.

In an embodiment, the wearable device may receive a touch input via the external surface. In an embodiment, the touch input may be obtained from a sensed contact by a second finger of the user. On the other hand, a type of wearable device worn on a finger has a small area of external surface due to its natural characteristics. Accordingly, the finger-worn wearable device has limitations in distinguishing various types of touch inputs or recognizing delicate touch operations due to its small area of the external surface.

In an embodiment, the wearable device may recognize patterns of touch inputs and match different control commands to different touch inputs. A pattern of a touch input may be determined based on factors such as, for example, a touch location of the touch input, a touch duration of the touch input, the number of touches in the touch input, and whether the touch input includes a dragging operation. If all factors for two touch inputs are the same, the two touch inputs may be regarded as having the same pattern. If at least one factor in the two touch inputs is different, the two touch inputs may be regarded as having different patterns.

In an embodiment, when the wearable device recognizes patterns of touch input and matches different control commands to different touch inputs, in the case of a finger-worn wearable device, due to a limited touch area (external surface), the number of patterns of touch inputs is limited, and furthermore, the number of operations controllable via touch inputs is limited.

In an embodiment of the present disclosure, a body part touching the wearable device worn on the user's finger may be identified by measuring an impedance Z between the inner surface electrode and the outer surface electrode. In an embodiment, by matching different operations with identified different types of body parts, it is possible to control two or more operations even when a touch input of the same pattern is received.

For example, when the number of patterns of touch inputs that the wearable device is able to sense is m, if the type of the second finger F2 touching the wearable device is not identified, the same control command may correspond to all touch inputs having the same pattern, and as a result, the wearable device may perform up to m control operations.

On the other hand, if the second finger F2 touching the wearable device is identified as the first type TYPE1 and the second type TYPE2 as described above, a touch input having the same pattern may correspond to two different control commands according to the identified type, and as a result, the wearable device may perform up to <NUM>*m control operations.

Furthermore, if the second finger F2 touching the wearable device is subdivided into and identified as n types (e.g., identified as each finger), or body parts not limited to fingers touching the wearable device are identified as n types, a touch input having the same pattern may correspond to n different control commands according to the identified types, and as a result, the wearable device may perform up to n*m control operations.

In this way, by identifying the type of the user's body part touching the wearable device, various control operations may be performed even by a touch input via a limited touch area of the wearable device.

In an embodiment, the user may touch the wearable device worn on the first finger F1 with two or more second fingers F2. In this case, a touch by each of the second fingers F2 per contact point may be regarded as a separate touch input, or a combination of touches by one or more second fingers F2 may be regarded as a single touch input.

According to an embodiment of the present disclosure, an operation of identifying a type of a body part performing a touch input by measuring the impedance between a body part where the wearable device is worn and the body part touching the wearable device is not limited to a case where the body part is a finger. For example, the operation of identifying the type of body part performing the touch input may also be applied when the wearable device worn on the user's finger is touched with another body part, such as an elbow, chin, or nose, or when an earring-type wearable device worn on the user's ear is touched with the wrist or both hands.

<FIG> and <FIG> are diagrams illustrating a wearable device <NUM> according to an embodiment of the present disclosure.

<FIG> is a cross-sectional view of the wearable device <NUM> according to an embodiment of the present disclosure, and <FIG> is a perspective view of the wearable device <NUM> according to an embodiment of the present disclosure. Referring to <FIG> and <FIG>, the wearable device <NUM> may include an inner surface electrode <NUM> disposed on an internal surface thereof and an outer surface electrode <NUM> disposed on an external surface.

In an embodiment, the inner surface electrode <NUM> may be formed on the entire internal surface of the wearable device <NUM>, but may also be formed on at least a portion of the internal surface as illustrated in <FIG> and <FIG>. In an embodiment, when the wearable device <NUM> is worn on the first finger F1 of the user, at least a portion of the internal surface of the wearable device <NUM> is in contact with the first finger F1 of the user, so the inner surface electrode <NUM> may not be formed on the entire internal surface of the wearable device <NUM>, but only on at least a portion of the internal surface.

In an embodiment, the outer surface electrode <NUM> may be formed on the entire external surface of the wearable device <NUM>, but may also be formed on at least a portion of the external surface as illustrated in <FIG> and <FIG>. In an embodiment, when the wearable device <NUM> has a directional angular shape instead of a non-directional cylindrical or doughnut shape, the outer surface electrode <NUM> may be formed on at least a portion of the external surface in consideration of a direction in which the wearable device <NUM> is worn. In an embodiment, when the wearable device <NUM> has a directionality, to prevent unintended touch input caused by fingers adjacent to the finger on which the wearable device <NUM> is worn, the outer surface electrode <NUM> may be disposed on the external surface by taking into account the directionality of the wearable device <NUM> and positions of the adjacent fingers.

In an embodiment, the outer surface electrode <NUM> may include a fingerprint recognition sensor. The fingerprint recognition sensor may include, for example, at least one of an optical fingerprint recognition sensor, a capacitive fingerprint recognition sensor, or an ultrasonic fingerprint recognition sensor.

In an embodiment, in response to sensing a touch input, the wearable device <NUM> may recognize a fingerprint for the second finger F2 via the fingerprint recognition sensor included in the outer surface electrode <NUM>. The recognized fingerprint may be used in an operation of verifying the type of the second finger F2 identified based on the impedance Z. For example, the wearable device <NUM> may separately identify a type of the second finger F2 based on the recognized fingerprint, compare the type of the second finger F2 identified based on the fingerprint with the type of the second finger F2 identified based on the impedance Z, and verify the type of the second finger F2 identified based on the impedance Z.

<FIG> and <FIG> are diagrams illustrating wearable devices 400a and 400b according to various embodiments of the present disclosure.

Referring to <FIG> and <FIG>, the wearable devices 400a and 400b may each include an inner surface electrode <NUM> disposed on an internal surface thereof and an outer surface electrode <NUM> disposed on an external surface.

In an embodiment, the inner surface electrode <NUM> may be formed on the entire internal surface of the wearable device 400a or 400b, but may also be formed on at least a portion of the internal surface as illustrated in <FIG> and <FIG>. In an embodiment, when the wearable device 400a or 400b is worn on the first finger F1 of the user, at least a portion of the internal surface of the wearable device 400a or 400b is in contact with the first finger F1 of the user, so the inner surface electrode <NUM> may not be formed on the entire internal surface of the wearable device 400a or 400b, but only on at least a portion of the internal surface.

Referring to <FIG>, in the wearable device 400a according to an embodiment, the outer surface electrode <NUM> may include a plurality of outer surface electrode units 465u. The plurality of outer surface electrode units 465u may be arranged at preset intervals along an outer circumferential surface of a body portion <NUM> of the wearable device 400a. As the outer surface electrode units 465u are arranged at the preset intervals on the outer circumferential surface of the wearable device, the user may be able to easily contact the outer surface electrode without paying much attention to a location of the outer surface electrode.

In an embodiment, contact by the second finger F2 of the user may include a plurality of touch inputs. The plurality of touch inputs may be identified by contact points included in the sensed 'contact event'. A contact point may be identified based on the outer surface electrode unit 465u and a body part. For example, contact via the different outer surface electrode units 465u may include two or more contact points, and even contact via one outer surface electrode unit 465u may include a plurality of contact points if the contact is made by different body parts or if a contact part is not continuous. In an embodiment, the sensed contact may correspond to a plurality of touch inputs according to the contact points included in the contact.

In an embodiment, a plurality of touch inputs obtained via different outer surface electrode units 465u may respectively correspond to control signals for different operations. For example, if the user touches each of the two outer surface electrode units 465u with two second fingers F2, the touch inputs respectively via the two outer surface electrode units 465u may correspond to control signals for two different operations. In an embodiment, one control signal may correspond to a combination of a plurality of touch inputs obtained via the different outer surface electrode units 465u. For example, when the user broadly touches two adjacent outer surface electrode units 465u with one second finger F2, a control signal related to one operation may correspond to a combination of touch inputs via the two adjacent outer surface electrode units 465u. However, a correspondence relationship between the plurality of outer surface electrode units 465u, the plurality of touch inputs, and the plurality of control signals is not limited to the illustrated embodiment and may be implemented in various combinations.

Referring to <FIG>, in the wearable device 400b according to an embodiment, the outer surface electrode <NUM> may be positioned entirely along an outer circumferential surface of a body portion <NUM> of the wearable device 400b. In this case, this may eliminate the user's inconvenience of having to accurately touch a predetermined location of the outer surface electrode (e.g., <NUM> in <FIG>) on the wearable device 400b in order to generate a touch input.

Moreover, in the wearable device according to an embodiment of the present disclosure, the arrangement, number, and shape of inner surface electrodes or outer surface electrodes are not limited to the above examples and may be implemented in various ways.

<FIG> is a diagram for describing an operation of measuring impedance Z between an outer surface electrode and an inner surface electrode, according to an embodiment of the present disclosure.

In operation S510, a wearable device may apply a voltage between an inner surface electrode and an outer surface electrode to cause a current to flow through a user's body between a first finger F1 and a second finger F2.

According to an embodiment of the present disclosure, the wearable device may include a power source capable of charging and discharging. For example, the power source may include a battery. In an embodiment, the wearable device may control the power source to apply a voltage between the inner surface electrode and the outer surface electrode so that a current flows through the user's body between the first finger F1 and the second finger F2.

In an embodiment, the power source and an impedance measuring portion may be included between the outer and inner surface electrodes on the inside of the wearable device. For example, the impedance measuring portion may include at least one of a voltmeter and an ammeter.

In an embodiment, when parts of the user's body respectively contact the outer surface electrode and the inner surface electrode, a closed circuit is formed that includes the inner surface electrode, the power source, the impedance measuring portion, the outer surface electrode, and the user's body.

When the wearable device controls the power source to apply a voltage of a preset magnitude between the inner surface electrode and the outer surface electrode, the voltage of the preset magnitude may be applied between the first finger F1 contacting the inner surface electrode and the second finger F2 contacting the outer surface electrode. In this case, current may flow through the formed closed circuit.

In operation S520, the wearable device may measure a current emitted via the inner surface electrode or the outer surface electrode and flowing through the user's body between the inner surface electrode and the outer surface electrode. In an embodiment, the impedance measuring portion may include an ammeter, and measure the intensity of a current flowing through the inner surface electrode or the outer surface electrode.

In operation S530, the wearable device may calculate an impedance Z between the outer surface electrode and the inner surface electrode, based on the measured intensity I of current and the magnitude V of the applied voltage. In an embodiment, the wearable device may calculate the impedance Z using Ohm's Law Z=V/I, based on the measured intensity I of current and the magnitude V of the voltage applied across the inner surface electrode and the outer surface electrode.

Moreover, in an embodiment, a current may be emitted from the power source included in the wearable device. For example, a current from the power source may be emitted via the inner surface electrode or the outer surface electrode. For example, if a current is emitted via the inner surface electrode of the wearable device, the power source may continuously apply the current to the first finger F1 contacting the inner surface electrode, regardless of whether the outer surface electrode is touched by the second finger F2.

In an embodiment, the wearable device may include a power source with a limited battery capacity, and periodically apply a pulse-type current to increase the usable time of the wearable device itself within the limited battery capacity.

Then, the moment when the second finger F2 touches the outer surface electrode, a closed circuit may be formed, and the current emitted from the power source via the inner surface electrode may flow through the formed closed circuit in the order of power source - inner surface electrode - first finger F1 - user's body - second finger F2 - outer surface electrode.

In an embodiment, the current from the power source may be emitted via the outer surface electrode. The power source may also continuously emit current regardless of whether the second finger F2 touches the outer surface electrode. Then, the moment the second finger F2 touches the outer surface electrode, a closed circuit may be formed, and the current emitted from the power source via the outer surface electrode may flow through the formed closed circuit in the order of power source - outer surface electrode - second finger F2 - user's body - first finger F1 - inner surface electrode.

In an embodiment, the wearable device may measure a voltage difference V between the inner surface electrode and the outer surface electrode. In an embodiment, the impedance measuring portion may include a voltmeter, and measure a voltage applied between the inner surface electrode and the outer surface electrode.

In an embodiment, the wearable device may calculate the impedance Z between the outer and inner surface electrodes based on the measured voltage difference V and the intensity I of the emitted current. The wearable device may calculate the impedance Z using Ohm's law Z=V/I, based on the measured voltage difference V and intensity I of the current emitted via the outer surface electrode or inner surface electrode.

<FIG> is a diagram for describing an operation in which a wearable device <NUM> identifies a type of a finger F2 of a user contacting the wearable device <NUM>, in response to sensing the contact, according to an embodiment of the present disclosure.

In an embodiment, the user may touch an external surface of the wearable device <NUM> worn on a first finger F1 with the second finger F2. An operation in which the user touches the wearable device <NUM> with the second finger F2 may be classified into at least two types.

In a first type TYPE1, the user may touch the external surface of the wearable device <NUM> by using the second finger F2 of the same hand as the first finger F1 on which the wearable device <NUM> is worn. In a second type TYPE2, the user may touch the external surface of the wearable device <NUM> by using the second finger F2 of a different hand than the first finger F1 on which the wearable device <NUM> is worn.

Referring to <FIG>, it can be seen that magnitudes of impedances z1 and z2 are measured differently in the first type TYPE1 and the second type TYPE2.

In the first type TYPE1, the first finger F1 on which the wearable device <NUM> is worn and the second finger F2 touching the wearable device <NUM> are on the same hand. In this case, an electrical pathway through the user's body between a portion of the first finger F1 contacting the inner surface electrode and a portion of the second finger F2 contacting the outer surface electrode may be formed to have a short length. Accordingly, the first impedance z1 measured between the outer surface electrode and the inner surface electrode may have a small magnitude.

In the second type TYPE2, the first finger F1 on which the wearable device <NUM> is worn and the second finger F2 touching the wearable device <NUM> are on different hands. In this case, an electrical pathway through the user's body between a portion of the first finger F1 contacting the inner surface electrode and a portion of the second finger F2 contacting the outer surface electrode may be formed to have a sufficient length to pass through a user's torso. Accordingly, the second impedance z2 measured between the outer surface electrode and the inner surface electrode may have a large magnitude.

As described above, the first impedance z1 between the outer and inner surface electrodes measured in the first type TYPE1 may have a relatively small value compared to the second impedance z2 between the outer and inner surface electrodes measured in the second type TYPE2. For example, the value of the first impedance z1 measured in the first type TYPE1 and the value of the second impedance z2 measured in the second type TYPE2 may differ by a factor of <NUM> or more.

<FIG> is a diagram for describing an operation of identifying a type of a user's finger contacting a wearable device by comparing a magnitude of a measured impedance Z with a preset threshold TH, according to an embodiment of the present disclosure.

In an embodiment, an operation of identifying a type of the second finger F2 touching the wearable device may include an operation of comparing a magnitude of the measured impedance Z with a preset threshold TH and an operation of identifying the type of the second finger F2 based on a comparison result. In detail, in the operation of identifying the type of the second finger F2 based on the comparison result, if the magnitude of the measured impedance Z is less than the preset threshold TH, the type of the second finger F2 may be identified as the first type TYPE1 of <FIG>, and if the magnitude of the measured impedance Z is greater than or equal to the preset threshold TH, the type of the second finger F2 may be identified as the second type TYPE2 of <FIG>.

<FIG> illustrates an exemplary graph of measured impedance Z values with respect to time t. For example, a minimum threshold TH0 or noise threshold may be a criterion for identifying whether a touch signal (contact) is generated. In an embodiment, when the measured impedance Z value is less than the minimum threshold TH0, it may be determined that A touch input is not received because no contact is sensed. In an embodiment, if the measured impedance Z value is greater than or equal to the minimum threshold TH0 and less than the preset threshold TH for type discrimination, it may be determined that a touch input is received because the contact is sensed, and that the touch input is of a first type TYPE1 as the touch input is received from a finger of the same hand as a finger on which the wearable device is worn. In an embodiment, if the measured impedance Z value is greater than or equal to the preset threshold TH for type discrimination, it may be determined that a touch input is received because the contact is sensed, and that the touch input is of a second type TYPE2 as it is received from a finger of a hand that is not the same as the finger on which the wearable device is worn.

Based on the above determination criteria, referring to <FIG>, at an interval t1, an impedance Z value that is <NUM> or less than the minimum threshold TH0 may be measured. Therefore, it may be considered that no touch input is received during the interval t1. At an interval t2, an impedance Z value that is greater than the preset threshold TH may be measured, and a touch input of the second type TYPE2 may be considered as having been received. At an interval t3, an impedance Z value that is greater than the minimum threshold TH0 but less than the preset threshold TH may be measured, and a touch input of the first type TYPE1 may be considered as having been received. At an interval t4, an impedance Z value that is greater than the preset threshold TH may be measured, and a touch input of the second type TYPE2 may be considered as having been received. At an interval t5, an impedance Z value that is <NUM> or less than the minimum threshold TH0 may be measured, and it may be considered that no touch input is received. At an interval t6, an impedance Z value that is greater than the minimum threshold TH0 but less than the preset threshold TH may be measured, and a touch input of the first type TYPE1 may be considered as having been received.

In an embodiment, impedance Z of fingers adjacent to the first finger F1 on which the wearable device is worn and included in the same hand, except in the case of the thumb, may be measured very low due to their very close distance through the body. Therefore, if the minimum threshold TH0 for noise removal is set to be greater than an impedance value measured when an adjacent finger unintentionally touches the external surface of the wearable device and less than an impedance value measured when a touch input is intended and performed via the thumb of the same hand or the like, reception of a touch input may be prevented due to being an unintended contact.

In an embodiment, body composition or height may be different depending on users, and therefore, the minimum threshold TH0 for noise removal and the threshold TH for distinguishing a type of a touch input need to be set differently for different users. For example, the minimum threshold TH0 and the threshold TH may be set differently for different users by a preset operation.

Furthermore, when the second finger F2 touching the wearable device is subdivided into and identified as n types (e.g., if identified as each finger), or body parts not limited to fingers touching the wearable device are identified as n types, several different thresholds TH may be set to identify different fingers or different body parts. For example, if the second finger F2 is identified as n types, the minimum threshold TH0 for identifying whether a touch is generated and at least n-<NUM> thresholds TH for distinguishing each type may be set.

<FIG> is a diagram for describing an operation in which an electronic device sets control command corresponding to a pattern <NUM> of touch input and a type <NUM> of a user's finger contacting a wearable device.

In an embodiment, the wearable device may obtain a touch input from contact by the second finger F2 of the user. Furthermore, the wearable device may identify the pattern <NUM> of the touch input, and identify an operation of the wearable device corresponding to the identified pattern <NUM> of the touch input and the identified type <NUM> of the second finger F2.

Different control commands may correspond to touch inputs having different patterns <NUM>. The pattern <NUM> of touch input may be determined based on factors such as, for example, a location of the touch input, a touch duration of the touch input, the number of touches in the touch input, and whether the touch input includes a dragging operation. If all factors for two touch inputs are the same, the two touch inputs may be regarded as having the same pattern <NUM>. If at least one factor in the two touch inputs is different, the two touch inputs may be regarded as having different patterns <NUM>.

For example, a first touch input may include a total of two touches, and a first touch may have a longer duration than a second touch. A second touch input may include a total of two touches, but a first touch may have a shorter duration than a second touch. In this case, it may be seen that the first touch input and the second touch input have different patterns <NUM> even though total times (touch duration) for which the first touch input and the second touch input are respectively maintained are the same and the number of times that contacts occur (the number of touches) for the first and second touch inputs is also <NUM> in total.

Referring to <FIG>, the pattern <NUM> of a touch input may include, for example, a click <NUM>, a double-click <NUM>, a right drag <NUM>, a left drag <NUM>, etc., but is not limited to these examples.

According to an embodiment of the present disclosure, one control command <NUM> may correspond to a pair of one pattern <NUM> of a touch input and one type <NUM> of the second finger F2 generating the touch input. For example, the control command <NUM> may include a control command for controlling an operation of the wearable device itself and a control command for controlling an operation of another electronic device connected to the wearable device via a network such as wireless short-range communication, etc..

Referring to <FIG>, the control command <NUM> that may correspond to the touch input includes, for example, move to next item <NUM>, move to previous item <NUM>, move forward <NUM>, move backward <NUM>, select <NUM>, execute <NUM>, move right <NUM>, and move left <NUM>, but is not limited to these examples. For example, a standby (no operation) command may correspond to a specific touch input.

In an embodiment, when the second finger F2 generating a touch input is of a second type <NUM>, a standby command may correspond to a specific pattern <NUM> of the touch input.

In an embodiment, an operation of matching one control command <NUM> to a pair of one pattern <NUM> of a touch input and one type <NUM> of the second finger F2 generating the touch input may be performed by the wearable device or another electronic device connected to the wearable device via a network such as wireless short-range communication, etc..

In an embodiment, the wearable device may identify a pattern of a touch input, identify a corresponding operation of the wearable device based on the identified pattern of touch input and identified type of second finger F2, and control the wearable device or another electronic device connected thereto based on the identified operation.

In an embodiment, an operation of controlling the wearable device based on an identified type of the second finger F2 and a touch input may include generating, based on the identified type of the second finger F2 and the touch input, a control signal for controlling operations of the wearable device and another electronic device connected to the wearable device via wireless short-range communication, and controlling the wearable device to transmit the generated control signal to the other electronic device.

<FIG> is a diagram for describing an operation of controlling another electronic device <NUM> connected via wireless short-range communication, depending on a type of a second finger F2 contacting a wearable device <NUM> worn on a first finger F1 of a user, according to an embodiment of the present disclosure.

In an embodiment, the other electronic device <NUM> may include, for example, at least one of a digital TV, a desktop computer, a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, an e-book reader, a personal digital assistant (PDA), a portable multimedia player (PMP), a navigation device, a slate PC, a tablet PC, a camera, a wearable device (e.g., a smart watch, smart glasses, a head mounted display (HMD)), a virtual reality (VR) device, an augmented reality (AR) device, an extended reality (XR) device, a home appliance, and other mobile or stationary computing devices. However, the electronic device <NUM> is not limited to the above examples.

The AR device is a device capable of representing AR and may generally include AR glasses in the form of eye glasses worn by the user on the face, an HMD, a VR headset (VRH), or an AR helmet (ARH) worn on the head, etc. In the case of a head-mounted device, a super-large screen may be provided to the user by placing a display in front of the user's eyes, and a realistic virtual world may be provided as the screen moves according to the user's movement.

Referring to <FIG>, in an embodiment, the electronic device <NUM> connected to the wearable device <NUM> is an AR device and may provide an image of a virtual object VO to a user wearing the AR device.

In an embodiment, when a touch input for touching and dragging is generated by a finger F2 of the same hand as a finger F1 on which the wearable device <NUM> is worn (TYPE <NUM>), an operation of the AR device may be controlled according to a control command corresponding to the touch input. For example, the image of the virtual object VO displayed via the AR device may move forward.

In an embodiment, when a touch input for touching and dragging is generated by a finger F2 of a hand that is not the same as the finger F1 on which the wearable device <NUM> is worn (TYPE <NUM>), an operation of the AR device may be controlled according to a control command corresponding to the touch input. For example, the image of the virtual object VO displayed via the AR device may move to the right.

As described above, according to an embodiment of the present disclosure, even when a touch input of the same pattern is generated, an operation performed by the connected other electronic device <NUM> may vary depending on the type of the finger F2 generating the corresponding touch input.

<FIG> is a diagram for describing an operation of controlling another electronic device <NUM> connected via wireless short-range communication, depending on a type of a second finger F2 contacting a wearable device <NUM> worn on a finger F1 of a user, according to an embodiment of the present disclosure.

Referring to <FIG>, in an embodiment, the electronic device <NUM> connected to the wearable device <NUM> is a desktop computer and may provide the user with execution windows W for various programs.

In an embodiment, when a touch input for touching and dragging is generated by the finger F2 of the same hand as the finger F1 on which the wearable device <NUM> is worn (TYPE <NUM>), an operation of the electronic device <NUM> may be controlled according to a control command corresponding to the touch input. For example, a vertical scroll in an execution window W displayed on a desktop computer may move downward.

In an embodiment, when a touch input for touching and dragging is generated by a finger F2 of a hand that is not the same as the finger F1 on which the wearable device <NUM> is worn (TYPE <NUM>), an operation of the electronic device <NUM> may be controlled according to a control command corresponding to the touch input. For example, a horizontal scroll in the execution window W displayed on the desktop computer may move to the right.

<FIG> is a diagram for describing an operation of controlling a wearable device <NUM> worn on a finger F1 of a user, according to an embodiment of the present disclosure.

Referring to <FIG>, in an embodiment, the wearable device <NUM> is a smart ring and may provide the user with services such as making calls, transmitting and receiving messages, playing music, etc..

In an embodiment, the wearable device <NUM> may receive a message and provide an alarm to the user. In this case, when a touch input for touching the wearable device <NUM> is generated by a finger F2 of the same hand as the finger F1 on which the wearable device <NUM> is worn is generated (TYPE <NUM>), an operation of the wearable device <NUM> may be controlled according to a control command corresponding to the touch input. For example, the wearable device <NUM> may display the content of the received message (read operation).

In an embodiment, when a touch input for touching the wearable device <NUM> is generated by a finger F2 of a hand that is not the same as the finger F1 on which the wearable device <NUM> is worn (TYPE <NUM>), an operation of the wearable device <NUM> may be controlled according to a control command corresponding to the touch input. For example, the wearable device <NUM> may stop providing an alarm without displaying the received message (cancel operation).

As described above, according to an embodiment of the present disclosure, even when a touch input of the same pattern is generated, an operation performed by the wearable device <NUM> may vary depending on the type of the finger F2 generating the touch input.

<FIG> is a block diagram of a wearable device <NUM> according to an embodiment of the present disclosure.

Referring to <FIG>, according to an embodiment of the present disclosure, the wearable device <NUM> may include a processor <NUM>, a storage <NUM>, a power source <NUM>, a measuring portion <NUM>, and electrodes <NUM>. The electrodes <NUM> may include an inner surface electrode <NUM> and an outer surface electrode <NUM>. All components illustrated in <FIG> are not essential components of the wearable device <NUM>. The wearable device <NUM> may be implemented with more components than those shown in <FIG> or implemented with fewer components than those shown in <FIG>.

The wearable device <NUM> may have a shape that allows wearing of the wearable device on a user's finger. For example, the wearable device <NUM> may have a ring, loop, thimble, band, or patch-like shape. In an embodiment, the wearable device <NUM> may include a housing that forms the exterior of the wearable device <NUM>. In an embodiment, the wearable device <NUM> having a ring shape may include at least one through insertion hole into which a first finger F1 of the user is inserted.

The power source <NUM> may supply necessary power to the wearable device <NUM>. The power source <NUM> may apply a voltage across the plurality of electrodes <NUM> or apply a current via at least one electrode <NUM> to cause the current to flow through the user's body between the first finger F1 of the user on which the wearable device <NUM> is worn and a second finger F2 of the user touching the wearable device <NUM>. The power source <NUM> may include a rechargeable battery that can be charged and discharged.

The storage <NUM> may store programs to be executed by the processor <NUM>, as described below, to control operations of the wearable device <NUM>. The storage <NUM> may store a program including at least one instruction for controlling operations of the electronic device <NUM>. The storage <NUM> may store instructions and program code that are readable by the processor <NUM>. In an embodiment, the processor <NUM> may be implemented to execute instructions or code of a program stored in the storage <NUM>. The storage <NUM> may store data input to or output from the wearable device <NUM>.

For example, the storage <NUM> may include at least one type of storage medium among a flash memory-type memory, a hard disk-type memory, a multimedia card micro-type memory, a card-type memory (e.g., an SD card or an XD memory), random access memory (RAM), static RAM (SRAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), PROM, a magnetic memory, a magnetic disc, and an optical disc.

Programs stored in the storage <NUM> may be categorized into a plurality of modules according to their functions.

The processor <NUM> may control all operations of the wearable device <NUM>. The processor <NUM> may perform operations according to an embodiment of the present disclosure. For example, the processor <NUM> may execute programs stored in the storage <NUM> to control all operations of the storage <NUM>, the power source <NUM>, the measuring portion <NUM>, and the electrodes <NUM>.

The processor <NUM> may be composed of hardware components for performing arithmetic, logic and input/output (I/O) operations and signal processing. For example, the processor <NUM> may consist of at least one of a CPU, a microprocessor, a graphics processing unit (GPU), application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and field programmable gate arrays (FPGAs), but is not limited thereto.

In an embodiment, the processor <NUM> may execute one or more instructions stored in the storage <NUM> to sense a contact by a second finger F2 of the user via the outer surface electrode <NUM>, measure, in response to the sensing of the contact, an impedance between the outer surface electrode <NUM> and the inner surface electrode <NUM> in contact with the first finger F1 of the user, identify a type of the second finger F2 based on the measured impedance, obtain a touch input from the contact by the second finger F2 of the user, identify a pattern of the touch input, identify an operation corresponding to the identified pattern of the touch input and the identified type of the second finger F2, and obtain a control signal for the identified operation. For example, the pattern of the touch input may be determined based on a touch location of the touch input, a touch duration of the touch input, the number of touches in the touch input, and whether the touch input includes a dragging operation.

In an embodiment, the processor <NUM> may execute the one or more instructions stored in the storage <NUM> to control the power source <NUM> to cause a current to flow through a user's body between the first finger F1 and the second finger F2.

In an embodiment, the processor <NUM> may control the power source <NUM> to apply a voltage between the inner surface electrode <NUM> and the outer surface electrode <NUM> or emit a current via the inner surface electrode <NUM> or the outer surface electrode <NUM>. For example, the processor <NUM> may control switches within the power source <NUM> and respectively connected between the power source <NUM> and the plurality of electrodes <NUM>. In this case, the processor <NUM> may control a switch connected to a specific electrode <NUM> to be closed, thereby electrically connecting the power source <NUM> to the corresponding electrode <NUM>. For example, to apply a voltage across the inner surface electrode <NUM> and the outer surface electrode <NUM>, the processor <NUM> may control a switch connected between one end of the power source <NUM> and the inner surface electrode <NUM> to be closed and a switch connected between the other end of the power source <NUM> and the outer surface electrode <NUM> to be closed.

In an embodiment, the processor <NUM> may execute the one or more instructions stored in the storage <NUM> to apply a voltage of a preset magnitude between the inner surface electrode <NUM> and the outer surface electrode <NUM>. The processor <NUM> may then control the measuring portion <NUM> to measure a current flowing through the user's body via the inner surface electrode <NUM> or the outer surface electrode <NUM>. For example, the measuring portion <NUM> may include an ammeter. Then, the processor <NUM> may calculate an impedance Z between the inner surface electrode <NUM> and the outer surface electrode <NUM>, based on intensity I of the measured current and the preset magnitude V of the applied voltage.

In an embodiment, the processor <NUM> may also execute the one or more instructions stored in the storage <NUM> to control the power source <NUM> to emit a current via the inner surface electrode <NUM> or the outer surface electrode <NUM>. For example, the processor <NUM> may control the power source <NUM> by opening or closing switches respectively connected between the power source <NUM> and the plurality of electrodes <NUM>. When a switch connected to a specific electrode <NUM> is closed, the power source <NUM> may be electrically connected to the corresponding electrode <NUM>, and the current emitted from the power source <NUM> may be output to a part of the user's body contacting the electrode <NUM>. The processor <NUM> may then measure a voltage difference V between the inner surface electrode <NUM> and the outer surface electrode <NUM>, and calculate the impedance Z between the outer surface electrode <NUM> and the inner surface electrode <NUM>, based on the measured voltage difference V and the intensity I of the emitted current.

In an embodiment, the type of the second finger F2 may include a first type TYPE1 and a second type TYPE2. The second finger F2 that is of the first type TYPE1 may belong to the same hand as the first finger F1, and the second finger F2 that is of the second type TYPE2 may belong to a different hand than the first finger F1. In an embodiment, the processor <NUM> may execute the one or more instructions stored in the storage <NUM> to compare a magnitude of the measured impedance with a preset threshold and identify a type of the second finger F2 based on a result of the comparing. For example, if the magnitude of the measured impedance is less than the preset threshold, the processor <NUM> may identify the type of the second finger F2 as the first type TYPE1, and if the magnitude of the measured impedance is greater than or equal to the preset threshold, the processor <NUM> may identify the type of the second finger F2 as the second type TYPE2.

The electrodes <NUM> may include the inner surface electrode <NUM> and the outer surface electrode <NUM>. The electrodes <NUM> may be included on the housing of the wearable device <NUM>. The inner surface electrode <NUM> may be located on an internal surface of the wearable device <NUM> having a ring shape and contact the first finger F1 of the user inserted into the through insertion hole. The outer surface electrode <NUM> may be located on an external surface of the wearable device <NUM> having a ring shape. The outer surface electrode <NUM> may include a plurality of outer surface electrode units. The plurality of outer surface electrode units may be arranged at preset intervals along the external surface of the wearable device <NUM>.

In an embodiment, the outer surface electrode <NUM> may include a fingerprint recognition sensor. In this case, the processor <NUM> may execute the one or more instructions stored in the storage <NUM> to recognize, in response to the sensing of the contact by the second finger F2 of the user, a fingerprint for the second finger F2 via the fingerprint recognition sensor included in the outer surface electrode <NUM>, identify a type of the second finger F2 based on the recognized fingerprint, and verify the type of the second finger F2 identified based on the impedance by comparing the type of the second finger F2 identified based on the fingerprint with the type of the second finger F2 identified based on the impedance.

In an embodiment, the wearable device <NUM> may further include a communication unit that performs wireless short-range communication with another electronic device. In this case, the processor <NUM> may execute the one or more instructions stored in the storage <NUM> to generate a control signal for controlling an operation of the other electronic device based on the identified type of the second finger F2 and the touch input, and control the communication unit to transmit the generated control signal to the other electronic device.

<FIG> is a block diagram illustrating the wearable device (<NUM> of <FIG>) according to another embodiment of the present disclosure.

Referring to <FIG>, the wearable device may include an input interface <NUM>, a processor <NUM>, an output interface <NUM>, a sensor unit <NUM>, and a communication unit <NUM>. All components illustrated in <FIG> are not essential components of the wearable device. The wearable device may be implemented with more components than those shown in <FIG> or implemented with fewer components than those shown in <FIG>.

The input interface <NUM> may refer to a device through which the user inputs a signal for controlling the wearable device. For example, the input interface <NUM> may include a touch sensor <NUM>, a microphone <NUM>, etc. For example, the touch sensor <NUM> may include a touch pad (a capacitive overlay type, a resistive overlay type, an infrared beam type, a surface acoustic wave type, an integral strain gauge type, a piezoelectric type, etc.), but is not limited thereto The touch sensor <NUM> may receive a user input for touching an external surface of the wearable device. In an embodiment, the touch sensor <NUM> may be included in the electrodes <NUM> of <FIG>. The wearable device may sense a contact by the second finger F2 of the user via the touch sensor <NUM>, or obtain a touch input from the user.

The microphone <NUM> may receive an external audio signal and process the audio signal as electrical audio data. For example, the microphone <NUM> may receive an audio signal from an external device or a speaker. The microphone <NUM> may use various noise removal algorithms to remove noise that occurs in the process of receiving an external audio signal. In an embodiment, the microphone <NUM> may receive, from the user, a voice signal for controlling the wearable device. In an embodiment, the wearable device can perform various operations based on a combination of a voice signal input via the microphone <NUM> and a touch input received via the touch sensor <NUM>.

In an embodiment, the processor <NUM> may be implemented similarly to the processor <NUM> of <FIG> described above. The processor <NUM> may execute programs stored in a storage to control operations of the components of the wearable device and all operations of the wearable device. For example, the processor <NUM> may identify a pattern of a touch input received from the user and a type of a body part contacting the wearable device, and control various operations according to a corresponding control command. For example, the processor <NUM> may generate a control signal for controlling an operation of the wearable device itself or controlling another electronic device connected to the wearable device according to the identified control command.

The output interface <NUM> may output an audio signal, a video signal, or a vibration signal, and may include a display <NUM>, an audio output interface <NUM>, and a vibration motor <NUM>.

The display <NUM> may display and output information processed by the wearable device. For example, the display <NUM> may display icons or the like to receive a touch input from the user.

Moreover, the display <NUM> and the touch sensor <NUM> form a layer structure to construct a touch screen. In this case, the display <NUM> may be used as an input device as well as an output device. The display <NUM> may include at least one of a liquid crystal display (LCD), a thin-film-transistor LCD (TFT LCD), an organic light-emitting diode (OLED) display, a flexible display, a three-dimensional (3D) display, and an electrophoretic display.

The audio output interface <NUM> may output audio data received via the communication unit <NUM> or stored in the storage. The vibration motor <NUM> may output a haptic effect, such as a vibration signal, to the user. In an embodiment, the audio output interface <NUM> or the vibration motor <NUM> may generate a notification signal for notifying the user of an event generated in the wearable device itself or an event generated in another electronic device connected to the wearable device.

The sensor unit <NUM> may sense a status of the wearable device or the surroundings of the wearable device, and transmit information about the sensed status to the processor <NUM>. The sensor unit <NUM> may include, but is not limited to, at least one of a position sensor (e.g., a global positioning system (GPS)) <NUM>, a current/voltage measuring portion <NUM>, a fingerprint recognition sensor <NUM>, an acceleration sensor <NUM>, a magnetic sensor <NUM>, and a gyroscope sensor <NUM>.

For example, the current/voltage measuring portion <NUM> may include the measuring portion <NUM> of <FIG>. In a method of controlling the wearable device worn on a finger, according to an embodiment of the present disclosure, the current/voltage measuring portion <NUM> may measure a current or voltage for measuring an impedance between an inner surface electrode in contact with a first finger of the user and an outer surface electrode in contact with a second finger of the user.

In an embodiment, the fingerprint recognition sensor <NUM> may be included in the outer surface electrode <NUM> of <FIG>. The fingerprint recognition sensor <NUM> may include, for example, at least one of an optical fingerprint recognition sensor, a capacitive fingerprint recognition sensor, or an ultrasonic fingerprint recognition sensor. According to an embodiment of the present disclosure, in the method of controlling the wearable device worn on a finger, the fingerprint recognition sensor <NUM> may recognize a fingerprint for the second finger of the user touching the outer surface electrode. The recognized fingerprint may be used in an operation of verifying a type of the second finger identified based on an impedance. In an embodiment, the recognized fingerprint may be used when user authentication is required in various applications of the wearable device.

In addition, functions of various sensors included in the sensor unit <NUM> may be intuitively inferred by a person skilled in the art from their names, so detailed descriptions thereof will be omitted.

The communication unit <NUM> may include one or more components for communicating another electronic device. For example, the communication unit <NUM> may include a short-range wireless communication unit <NUM> and a mobile communication unit <NUM>.

The wearable device may be connected to another electronic device via the short-range wireless communication unit <NUM>. The short-range wireless communication unit <NUM> may include, but is not limited to, a Bluetooth communication unit, a Bluetooth Low Energy (BLE) communication unit, a near field communication (NFC) unit, a wireless local area network (WLAN) (or Wi-Fi) communication unit, a ZigBee communication unit, an Infrared Data Association (IrDA) communication unit, a Wi-Fi Direct (WFD) communication unit, an ultra-wideband (UWB) communication unit, and an Ant+ communication unit. In an embodiment, the wearable device may exchange control signals with the other electronic device via the short range communication unit <NUM>.

The wearable device may transmit or receive a wireless signal to or from at least one of a base station, an external terminal, and a server on a mobile communication network via the mobile communication unit <NUM>. In this case, the wireless signal may include a voice call connection signal or various types of signals according to transmission and reception of text/multimedia messages.

In an embodiment, when the wearable device functions only as a controller for the other electronic device connected thereto, the communication unit <NUM> of the wearable device does not directly include the mobile communication unit <NUM>, but may include only the short-range communication unit <NUM>. In this case, the wearable device may generate a control signal for controlling an operation of the other electronic device connected thereto based on a touch input from the user, and transmit the generated control signal to the other electronic device via the short-range communication unit <NUM>. In addition, when a notification through the wearable device is required, the wearable device may receive information about the notification from the other electronic device via the short range communication unit <NUM>.

In an embodiment, in addition to functioning as a controller for another electronic device connected thereto, and the wearable device itself may also function as an independent mobile communication terminal. In this case, the communication unit <NUM> of the wearable device may include both the short-range communication unit <NUM> and the mobile communication unit <NUM>, and the wearable device may operate as an independent mobile communication terminal via the mobile communication unit <NUM> even when not connected to another electronic device.

Various embodiments of the present disclosure may be implemented or supported by one or more computer programs which may be created from computer-readable program code and recorded on computer-readable media. In the present disclosure, an "application" and a "program" refer to one or more computer programs, software components, a set of instructions, procedures, functions, objects, classes, instances, associated data, or parts thereof, which are suitable for implementation in computer-readable program code. The "computer-readable program code" may include various types of computer code including source code, object code, and executable code. The "computer-readable media" may include various types of media that are accessible by a computer, such as ROM, RAM, a hard disk drive (HDD), compact discs (CDs), digital video discs (DVDs), or various other types of memory.

Furthermore, a computer-readable storage medium may be provided in the form of a non-transitory storage medium. In this regard, the 'non-transitory storage medium' is a tangible device, and may exclude wired, wireless, optical, or other communication links through which transient electrical or other signals are transmitted. Moreover, the 'non-transitory storage medium' does not differentiate between where data is semi-permanently stored in the storage medium and where the data is temporarily stored in the storage medium. For example, the 'non-transitory storage medium' may include a buffer in which data is temporarily stored. The computer-readable media may be any available media that are accessible by the computer and may include both volatile and non-volatile media and both detachable and non-detachable media. The computer-readable media may include media in which data may be permanently stored and media in which data may be stored and then overwritten, such as a rewritable optical disk or an erasable memory device.

According to an embodiment, methods according to various embodiments set forth herein may be included in a computer program product when provided. The computer program product may be traded, as a product, between a seller and a buyer. For example, the computer program product may be distributed in the form of a computer-readable storage medium (e.g., CD-ROM) or distributed (e.g., downloaded or uploaded) on-line via an application store (e.g., Google Play Store™) or directly between two user devices (e.g., smartphones). For online distribution, at least a part of the computer program product (e.g., a downloadable app) may be at least transiently stored or temporally created on a computer-readable storage medium, such as a server of a manufacturer, a server of an application store, or a memory of a relay server.

The above description of the present disclosure is provided for illustration, and one of ordinary skill in the art will understand that it can be readily modified into other specific forms without changing the technical ideas or essential features of the present disclosure. Accordingly, the above-described embodiments and all aspects thereof are merely examples and are not limiting. For example, each component defined as an integrated component may be implemented in a distributed fashion, and likewise, components defined as separate components may be implemented in an integrated form.

Claim 1:
A method of controlling a wearable device (<NUM>, <NUM>) worn on a finger of a user, the method comprising:
sensing a contact by a second finger of the user via an outer surface electrode (<NUM>) located on an outer circumferential surface of the wearable device worn on a first finger of the user;
measuring, in response to the sensing of the contact, an impedance between the outer surface electrode and an inner surface electrode (<NUM>) that is in contact with the first finger of the user;
identifying a type of the second finger based on the measured impedance; and
controlling an operation of the wearable device based on the identified type of the second finger.