-~
`
` WIPO
`
`WORLD
`INTELLECTUAL PROPERTY
`ORGANIZATION
`
`DOCUMENT MADE AVAILABLE UNDER THE
`PATENT COOPERATION TREATY (PCT)
`PCT/EP2012/070273
`International application number:
`
`International filing date:
`
`12 October 2012 (12.10.2012)
`
`Document type:
`
`Document details:
`
`Certified copy of priority document
`
`Country/Office:
`Number:
`Filing date:
`
`CH
`01689/11
`18 October 2011 (18.10.2011)
`
`Date of receipt at the International Bureau:
`
`23 October 2012 (23.10.2012)
`
`Remark: Priority document submitted or transmitted to the International Bureau in compliance with Rule
`17.1(a),(b) or (b-bis)
`
`34, chemin des Colombettes
`1 2 I I Geneva 20, Switze1·Iand
`
`www.wipo.int
`
`Petitioner Samsung Ex-1032, 0001
`
`

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`SCHWEIZERISCHE EIDGENOSSENSCHAFT
`CONFEDERATION SUISSE
`CONFEDERAZIONE SVIZZERA •
`
`Bescheinigung
`
`Die beiliegenden Akten stimmen mit den ursprunglichen technischen
`Unterlagen der auf der nachsten Seite bezeichneten Patentanmeldung fur
`die Schweiz und Liechtenstein Oberein. Die Schweiz und das Furstentum
`Liechtenstein bilden ein einheitliches Schutzgebiet. Der Schutz kann
`deshalb nur fur beide Lander gemeinsam beantragt werden .
`
`Attestation
`
`Les documents ci-joints sont conformes aux pieces techniques originales
`de la demande de brevet pour la Suisse et le Liechtenstein specifiee a la
`page suivante. La Suisse et la Principaute de Liechtenstein constituent un
`territoire unitaire de protection. La protection ne peut done etre
`revendiquee que pour !'ensemble des deux Etats .
`
`•
`
`Attestazione
`
`,,.-- ·-"' - --
`
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`
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`I documenti allegati sono conformi agli atti tecnici originali della domanda
`di brevetto per la Svizzera e ii Liechtenstein specificata nella pagin1/ l}
`seguente. La Svizzera e ii Principato di Liechtenstein formano u.9-unico;;?V
`•
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`territorio di protezione. La protezione puo dunque essere rivenoicata t;,;
`solamente per l'insiem<i dei due Stati.
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`Administration Patente
`Administration des brevets
`Amministrazione dei brevetti
`
`Heinz Jenni
`
`Petitioner Samsung Ex-1032, 0002
`
`

`

`•
`
`Petitioner Samsung Ex-1032, 0003
`
`Petitioner Samsung Ex-1032, 0003
`
`

`

`•
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`•
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`•
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`•
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`•
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`'
`
`Certificat de depot pour la demande de brevet no 01689/11 (Art. 46b al. 1 OBI)
`
`L'lnstitut Federal de la Propriete lntellectuelle accuse reception de la demande de brevet
`Suisse dont le detail figure ci-dessous.
`
`Titre:
`A method and circuit for switching a microelectronic device from a first power mode to a
`secpnd power mode .
`
`Requerant:
`Comme le Temps SA
`
`1162 Saint-Prex
`
`Mandataire:
`P&TS SA
`Av. J.-J. Rousseau 4
`P.O. Box 2848
`2001 Neuchatel
`
`Date du depot: 18.10.2011
`
`Classement provisoire: G04G
`
`Petitioner Samsung Ex-1032, 0004
`
`

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`•
`
`Petitioner Samsung Ex-1032, 0005
`
`Petitioner Samsung Ex-1032, 0005
`
`

`

`•
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`•
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`•
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`{.
`
`Unvarl!nderUches Exemprar
`Exempiaire invariable
`Esemplare immutabile
`
`1689/11
`
`Smartc-3-ch
`
`A method and circuit for switching a microelectronic device from a
`first power mode to a second power mode
`
`Field of the invention
`
`[0001)
`The present invention is related to a method for switching a
`microelectronic device from a first power mode to a second power mode,
`and to a device which can be switched from a first power mode to a second
`5 power mode. The present invention is also related to devices with a touch
`panel and a plurality of power modes .
`
`Description of related art
`
`[0001)
`EP1324159 concerns a wristwatch having a touch panel. When
`not used, a display is switched to a sleeping mode. To avoid an accidental
`activation of the sensors, a press button is provided to activate the sensors
`and the liquid crystal display.
`
`10
`
`US2009199130 concerns a method and apparatus for receiving an
`[0002)
`input by a user on an interactive touchscreen display. The input comprises a
`contact gesture detected with accelerometers.
`
`15
`
`(0003)
`US2002118605 discloses a tactile wristwatch in which touch-
`sensitive keyboard keys are switched on when a user presses a touch(cid:173)
`sensitive keyboard.
`
`[0004)
`US2009102669 discloses an alarm clock that can be stopped by
`the hand of a user approaching a proximity sensor.
`
`20
`
`(0005) WO09120292 concerns mobile handheld devices such as, for
`example, cell phones or personal digital assistants (PDAs) containing an
`accelerometer that sends a signal that causes the device to turn on.
`
`[0006) WO11000893 describes a wristwatch with a touch display. The
`wristwatch comprises an accelerometer which is used for simulating effects
`
`Petitioner Samsung Ex-1032, 0006
`
`

`

`2
`
`smartc-3-ch
`
`of shocks or acceleration on the movement. In order to reduce the power
`consumption, the display is automatically switched into a sleeping mode
`when not used. The user can wake up the display by means of a slight
`pressure of the glass or with a single tap or a double tap on the touch
`5 panel. This document does not describe how taps or double taps are
`detected and distinguished from other gestures or manipulations of the
`watch.
`
`•1
`
`10
`
`Therefore, different methods are known in order to switch on a
`(0007)
`device in sleep mode. However, it is difficult to distinguish between
`intentional commands to switch a device and other gestures or
`accelerations during normal use of the device. For example, undesired
`switch of operating mode could occur when the touch display touches a
`piece of cloth or during other manipulations of the watch.
`
`Brief summary of the invention
`
`15
`
`(0008)
`It is therefore an aim of the invention to provide a better method
`for switching a device, such as a microelectronic device, into a different
`power mode.
`
`(0009)
`It is another aim of the invention to provide a method for faster
`switching of a device into a different power mode, without causing
`20 unwanted power mode switches ..
`
`It is another aim to provide a method for switching a device into
`(0010)
`a different power mode which avoids undesired change of mode.
`
`According to the invention, these aims are achieved by means of
`[0011)
`a method for switching a device from a first power mode to a second
`25 power mode, comprising:
`using an inertial sensor for detecting a gesture on a display of
`said device;
`using a touch panel within said display for detecting said gesture;
`combining gesture detection by the inertial sensor and gesture
`
`Petitioner Samsung Ex-1032, 0007
`
`

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`t
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`3
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`smartc-3-ch
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`detection with the touch panel for triggering a switch from said first power
`mode to said second power mode.
`
`[0012]
`The gesture entered by the user to switch the power mode could
`be a tap, a double tap, a long tap or any other significant and recognizable
`5 gesture rarely occurring outside of normal use of the device, and which do
`not need important processing capabilities to be recognized.
`
`[0013]
`The simultaneous and combinatory usage of an inertial sensor,
`such as an accelerometer, and of a touch sensor or touch panel for
`detecting a gesture provides a more reliable discrimination between
`10 various gestures and other manipulations. Moreover, this solution reduces
`the power consumption in the first power mode since only the inertial
`sensor needs to be switched on in this mode .
`
`(0014]
`The first power mode could be a sleep mode, or standby mode, in
`which the power consumption is reduced but no indications are displayed
`15 on the display. The second power mode could be an operating mode where
`indications are displayed on the display .
`
`Brief Description of the Drawings
`
`[0015]
`The invention will be better understood with the aid of the
`description of an embodiment given by way of example and illustrated by
`the figures, in which:
`
`20
`
`Figure 1 a illustrates a perspective view of a button less wristwatch
`with a touch display according to the invention.
`
`Figure 1 b illustrates a transversal cut through the wristwatch of
`Figure 1a.
`
`25
`
`Figure 2 schematically illustrates a possible arrangement of some
`components within an embodiment of wristwatch.
`
`Petitioner Samsung Ex-1032, 0008
`
`

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`4
`
`smartc-3-ch
`
`Figure 3 is a chronogram which illustrates the force f applied to the
`glass of a touch panel during a tap gesture.
`
`Figure 4 is a chronogram which illustrates the acceleration measured
`by an accelerometer in a direction perpendicular to the glass of a touch
`5 panel during a tap gesture.
`
`Figure 5 is a chronogram which illustrates a signal measured by a
`touch sensor during a tap gesture.
`
`Figure 6 is a signal which illustrates an example of power-on signal
`generated by a circuit according to the invention.
`
`10 Detailed Description of possible embodiments of the Invention
`
`Figure 1 a and 1 b illustrate an example of a wristwatch 1
`[0016]
`according to the invention. The illustrated watch comprises notably a
`wristband 2 and a watch case 5 closed with a glass 3a and a touch sensor 3b
`covering a digital matrix display 4.
`
`15
`
`20
`
`In a preferred embodiment, the watch has no crown and no
`[0017]
`push-buttons and is operated only through the touch panels and additional
`sensors, such as inertial sensors, inside the watch case. The water-tightness
`and solidity of the case is thus improved.
`
`A luminosity sensor enabling the intensity of the screen to be
`[0018]
`automatically adapted to the surrounding luminosity can also be used as an
`option. The watch can switch nearly instantly from a stand-by mode, where
`the display is switched off or at least less luminous, to a "time reading"
`and/or navigation mode, for example as soon as the glass is touched or
`following a tap or double tap on the glass.
`
`25
`
`(0019]
`The watch case 5 can also include a connector (not shown) to
`connect the watch to an external computer, for example a micro or nano
`USB connector on the bottom or in one of the watch's sides. Wireless
`
`Petitioner Samsung Ex-1032, 0009
`
`

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`smartc-3-ch
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`connection means, for example a ZigBee or Bluetooth module, can also be
`provided for connecting the watch to a personal computer and/or for
`supplying power to the watch and load the battery.
`
`5
`
`[0020]
`The watch is advantageously powered electrically by means of a
`rechargeable accumulator 20 (Figure 1 b) through the micro or nano USB
`connector, through a specific or proprietary connector or, in a variant
`embodiment, through a radiofrequency interface.
`
`10
`
`15
`
`20
`
`[0021]
`The glass 3a with the touch sensor 3b underneath closes the
`upper surface of the watch case and covers the digital matrix display 4;
`there is an air gap between the touch sensor 3b and the display. The glass is
`preferably made of sapphire or of another scratchproof material and is
`coated with an anti-glare treatment. In a preferred embodiment, the glass
`is cylindrically, or possibly spherically curved, while the display .4 is
`preferably flat.
`
`[0022]
`The display 4 is preferably a high-resolution digital matrix
`display, and fills up nearly the entire surface under the glass 3a and thus
`serves both as multipurpose multifunction display and as time indicator. In
`a preferred embodiment, the display is a color liquid crystal display (LCD) or
`color thin film transistor display (TFT) with at least 150x150 pixels or more
`than 200 dpi (dot per inch). Other types of display, including displays based
`on the AMOLED technology for example, can also be used. Furthermore,
`the watch could also have several displays, for example several digital
`displays, or a digital matrix display combined with hands or other
`mechanical indicators.
`
`25
`
`[0023]
`The display 4 is preferably placed on a printed circuit board 31 on
`which other components, such as a microcontroller, an inertial sensor etc
`are also mounted. A connector 30 connects the touch sensor 3b with the
`printed circuit board 3b; in one preferred embodiment, this connector is
`detachable, so that the glass 3a can be replaced independently of the
`30 printed circuit board. In the illustrated embodiment, the printed circuit
`board 31 rests directly against the watch case 5, so that accelerations on the
`
`Petitioner Samsung Ex-1032, 0010
`
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`C
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`C
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`C
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`(
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`(
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`6
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`smartc-3-ch
`
`glass 3a are transmitted to the inertial sensor on the board 31 with minimal
`damping.
`
`5
`
`[0024]
`The touch sensor or touch panel 3b is laminated or deposited
`underneath the glass 3a. In the following, since those two components are
`integrated, we will use interchangeably the expression glass or touch panel
`or touch sensor for designating the same component, depending on the
`context. A touch panel integrated between the display 4 and the glass
`cover 3a could also be used in a sandwich configuration with a flat glass
`cover 3a.
`
`10
`
`[0025]
`The touch panel 3b has an array of transparent electrodes and is
`placed underneath the glass 3b in order to detect the presence of a finger
`or of a stylus. The detection technology preferably uses methods known in
`the state of the art, for example a capacitive detection, for detecting finger
`contact and various gestures on one or several of the electrodes. In one
`15 embodiment, transparent electrodes can be individually powered in order
`to put the touch panel in a low power mode with only some electrodes, for
`example electrodes in the middle, which are powered on and can detect
`finger contact on the corresponding part of the display; the remaining
`electrodes are not powered on in this low power mode.
`
`20
`
`[0026]
`The display 4 can display various indications, for example the
`current time, date, chrono, reverse counter, calendar, etc. .. or phases of the
`moon as shown in Figure 1. In order to extend the watch's functionalities,
`the user can switch from one display mode to another and for example
`replace the card displayed in Figure 1 with other cards. In a preferred
`25 embodiment, the user can move from one card to the other with a slide
`(fast) or scroll (slow) gesture for moving through and viewing a collection
`of available displays or cards. Scrolling or sliding in the horizontal or
`vertical direction is achieved by moving the finger on the glass in the
`corresponding direction.
`
`30
`
`Figure 2 schematically illustrates a possible arrangement and
`[0027]
`schematic of some components within an embodiment of wristwatch
`
`Petitioner Samsung Ex-1032, 0011
`
`

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`7
`
`smartc-3-ch
`
`according to the invention. Only components which are necessary for the
`understanding of the invention have been represented, although other
`components and other arrangements could be provided in other
`embodiments of the invention .
`
`5
`
`[0028]
`The illustrated arrangement comprises a power supply 20, such as
`a rechargeable battery, for supplying power to all other components. A
`microcontroller 21 controls the display of indications on the matrix panel 4,
`depending on signals provided by the sensors 22, 23 and on commands
`entered by the user through the touch panel 4 .
`
`10
`
`(0029]
`The component 22 is a real-time clock for generating a clock
`signal based on a quartz (not shown).
`
`[0030]
`The sensor 23 is an inertial sensor, preferably an accelerometer,
`preferably a 3-axis mems-based accelerometer for measuring acceleration
`values a (fig. 4) in a direction perpendicular to center of the glass of the
`15 wristwatch and in two orthogonal directions in a plane tangential to this
`glass at his center. This inertial sensor can comprise signal processing
`capabilities embedded within the same component or chip, for determining
`the frequency of the measured acceleration signal, the direction of this
`signal in 2 or 3 directions, the duration of an event in the acceleration
`signal, etc.
`
`20
`
`[0031]
`The component 24 is a touch panel controller for interpreting
`touch signals provided by the touch panel 3b when the user touches the
`glass 3a with his finger and consequently generate signals in the touch
`panel 3b located underneath, and for converting those signals into
`command signals for the microcontroller 21.
`
`l
`
`25
`
`[0032]
`Other components, such as an input-output circuit, for example a
`USB decoder or a Bluetooth or ZigBee receiver, can also be integrated.
`
`[0033]
`The microcontroller 21 is specifically configured to interpret the
`signals from the touch controller 24 and from the inertial sensor 23, to
`
`Petitioner Samsung Ex-1032, 0012
`
`

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`8
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`smartc-3-ch
`
`-
`
`select indications from several available indications depending on these
`signals, and to display those indications on the digital matrix display 4; this
`arrangement is preferably achieved by storing in the microcontroller's
`memory a computer program (firmware) allowing this specific sequence of
`5 operation to be fully controlled.
`
`10
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`15
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`20
`
`[0034]
`At least some of the components 21 to 24 and 3b and 4 can be
`powered in at least two different modes. In one preferred embodiment, a
`power saving mode and a time display mode are provided; the whole
`wristwatch can thus be powered either in time display mode for displaying
`time or other indications on the display 4, or in power saving mode for
`preserving the battery 20 by switching the display 4 the touch sensor 3b
`and other components in a low consumption mode. In one preferred
`embodiment, the display 4 and the touch sensor 3b are switched off in low
`power saving mode.
`
`[0035]
`In some embodiments, more than two power modes can be
`provided; for example, the real time clock 22 is preferably always powered
`on in power saving mode, so that the real time is not lost when the display
`4 and the touch panel 3b are switched off; it is possible however to switch
`the real time clock off in a deep sleep mode in order to prevent the battery
`from being totally discharged. Other components, such as the
`microcontroller 21, the touch panel 3b etc could have more than two
`different power modes, for example a hot power saving mode allowing for
`a very fast re-start, and a cold power saving mode in which restart is
`possibly slower or necessitates restarting an operating system.
`
`25
`
`[0036]
`The device 1 can be switched from a first power mode, such as a
`power saving mode, to a second power mode, such as a time display mode,
`with a user gesture on the glass 3a I touch panel 3b . The device 1 can
`automatically return to the first power mode, for example after a
`predetermined duration, or when no acceleration and no activity are
`30 detected.
`
`Petitioner Samsung Ex-1032, 0013
`
`

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`9
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`smartc-3-ch
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`In one embodiment, a gesture command to switch the device
`[0037]
`into a second power mode is detected with the inertial sensor 23 for
`detecting a tap, a double tap or another command which can be input by
`the user onto the glass 3a I touch panel 3b in order to trigger a change of
`5 power mode. The inertial sensor 23 could be an accelerometer with
`embedded power processing capabilities and which is always powered on
`in the first low power mode.
`
`10
`
`In order to avoid undesired switches to the second power mode,
`[0038]
`which would switch the display on and reduce the operating time of the
`battery, it is necessary to discriminate between changes in the acceleration
`signals which are caused by a switch on gesture, such as a tap or a double
`tap, and any other acceleration caused when the wristwatch is displaced or
`manipulated in normal use. In one preferred embodiment, the
`accelerometer 23 generates a power on signal 230 for powering the touch
`15 panel 3b and the touch controller 24 when the user enters a tap gesture on
`the glass 3a/ touch panel 3b, which can be discriminated from other signals
`with the following properties:
`
`-frequency: tap signals are typically high frequency signals and
`can be distinguished from other signals produced by slide, rub
`etc. The acceleration produced by a valid single tap is a pulse
`function with a first step of fast increase of the acceleration
`almost immediately followed by a step of fast deceleration, the
`duration of the whole pulse being typically in the range of 10 to
`20 ms. Therefore, the bandwidth of this pulse-like function is
`necessarily higher than a predefined threshold, and a low pass
`filtering of acceleration signals can be used to cancel signals
`produced by gestures other than taps.
`
`-duration of the pulse: as indicated, a valid single tap generates a
`pulse with a duration within a given range, usually between 5
`and 100 ms, typically between 10 and 20 ms.
`
`20
`
`25
`
`30
`
`Petitioner Samsung Ex-1032, 0014
`
`

`

`C
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`(
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`10
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`smartc-3-ch
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`-amplitude of the pulse: a valid single tap is detected only if the
`amplitude of the acceleration is higher than a first predefined
`threshold a_tap_thresh• End of the tap is detected when the
`amplitude decreases below a second threshold a_notap_thresh•
`
`-direction of the acceleration: a tap on the glass generates a
`maximal acceleration in a main direction perpendicular to the
`center of the glass, oriented toward the bottom of the watch,
`and a much lower acceleration in all other directions. A 3D
`accelerometer can be used for discriminating valid taps based on
`the direction of the acceleration. For example, if the acceleration
`in a direction other than the main direction is higher than the
`acceleration in the main direction, the gesture will not be
`recognized as a switch on tap.
`
`-slope of the acceleration : this feature can also be used to
`differentiate between a valid switch on tap and a non valid one.
`Taps typically generate a fast increase of the acceleration,
`whereas most other gestures such as swipes etc produce a slower
`acceleration increase. Therefore, the system could distinguish
`that a tap is not valid if the slope of the acceleration is not in an
`expected range.
`
`5
`
`10
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`15
`
`20
`
`Those discriminating criteria can also be combined in different
`(0039)
`ways. For example, the processing means within the accelerometer could
`use the direction of the acceleration only during a limited time window, for
`example a less than 100 ms time interval starting at the beginning of the
`25 pulse.
`
`Other discriminating criteria could be used if other gestures, such
`(0040)
`as double taps or long taps, are used as command to change the power
`mode.
`
`In the embodiment of the invention illustrated on Figure 2, the
`(0041)
`30 power on signal 230 generated by the inertial sensor 23 is used to wake up
`
`Petitioner Samsung Ex-1032, 0015
`
`

`

`11
`
`smartc-3-ch
`
`the touch panel 3b and/or the touch controller 24, or to switch those
`components from a low power mode to another power mode. Therefore,
`the touch panel 3b is switched off, or at least in low power mode, when
`the device 1 is in the first power mode, and is powered on, or at least
`5 partially powered on, after detection of a likely tap and generation of a
`wake up signal 230 by the accelerometer 23. In one embodiment, the wake
`up signal 230 generated by the inertial sensor 23 triggers a switch on
`command of the touch panel 3b and/or of the touch controller 24 from a
`low power mode in which nothing is displayed and no finger touch can be
`10 detected, to an intermediate power mode where only a subset of
`electrodes of the touch panel is activated, for example electrodes in the
`middle of the touch panel, in order detect finger contact such as taps or
`double taps in this limited area only and to avoid detection if a tap is made
`in a different area. In another embodiment, the wake up signal 230
`triggers a switch on command of the touch controller 24 into a mode
`where all touch electrodes are activated, to detect a tap or double tap in
`any area of the touch panel 3b. It is also possible to activate the touch
`panel 3b and the touch controller 24 during only a limited duration,
`preferably less than 100 ms, after generation of the wake up signal 230 .
`
`15
`
`20
`
`25
`
`30
`
`The touch controller 24 generates a second wake up signal 240 to
`[0042]
`wake up the microcontroller 21, and possibly other components of the
`device 1, when this touch controller confirms the tap detection. The second
`wake up signal 240 can be input to an interrupt line or switch on line of the
`microcontroller 21. In one embodiment, the wake signal 230 of the inertial
`sensor 23 is generated very fast at the beginning of the tap, the touch
`controller 24 is immediately woken up, and used to confirm the finger
`detection on the touch sensor 3b during the remaining time of the tap. In
`another embodiment, a double tap is required, and the inertial sensor is
`used to detect the first tap while the touch sensor 3b, possibly in
`cooperation with the inertial sensor 23, is used for detecting the second
`confirmation tap. In yet another embodiment, a long tap is required, i.e. a
`tap where the finger rests against the glass during a minimal period. In all
`embodiments, a second wake up signal 240 is only generated if
`confirmation of a tap or double tap from the touch panel 3b occurs within
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`Petitioner Samsung Ex-1032, 0016
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`(,i
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`12
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`smartc-3-ch
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`a predetermined duration after the first wake signal, for example within a
`duration less than 300 ms, preferably less than 100 ms.
`
`[0043]
`Discrimination of a tap by the touch controller 24 preferably
`depends on the location, size and duration of a touch signal generated by
`5 adjacent electrodes. A tap is usually made with the tip of a finger, i.e. on a
`small surface, during a short period, preferably on predetermined locations
`of the display.
`
`(0044]
`The microcontroller 21 is only woken up by the second wake up
`signal of the touch controller 24. In another embodiment not illustrated
`10 hereby, the microcontroller is already woken up by the first wake up signal,
`and used for discriminating between tap and no tap based on signals from
`the touch controller 24; the second wake up signal is only used to confirm
`the first wake up signal and prevent the microcontroller 21 for reentering
`into the first power mode.
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`15
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`[0045]
`In one embodiment, a rough discrimination between a wake up
`gesture and no wake up gesture is made by the inertial sensor 23 and/or
`the touch sensor 3b, in order to wake up the microprocessor 21. The
`microprocessor then analyses the sequence of acceleration value delivered
`by the acceleration sensor, as well the signals delivered by the touch
`20 controller 24, to confirm or infirm the decision to wake up the device 1 and
`in particular the display and touch panel 3b. If the microprocessor confirms
`the tag detection, it remains in operating mode and wake up the display.
`On the other hand, if tap detection is not confirmed by the more advanced
`algorithms used by the microcontroller, the microcontrollers puts the touch
`25 panel 3b, touch controller 24 and itself back into the first power mode.
`
`[0046]
`Figures 3 to 6 illustrate chronograms of various signals produced
`during a tap of the user on the glass of the wristwatch. Figure 3 illustrates
`the force f applied by the finger on the glass during a tap between t0 and
`t1. The force increases very suddenly from t1, remains approximately
`constant at a high level, and then decreases very quickly when the user
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`Petitioner Samsung Ex-1032, 0017
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`13
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`smartc-3-ch
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`releases the finger until he left the glass at t1. The duration between to
`and t1 is typically comprised between 10 and 20 ms.
`
`[0047]
`Figure 4 illustrates the acceleration as measured by the
`accelerometer 23 in a direction perpendicular to the center of the touch
`5 panel 3b during the tap. The acceleration increases from time to up to a
`maximum, and then decreases or even becomes negative until t1. The
`acceleration might oscillate at low amplitude after the finger release. A tap
`is detected only if the amplitude of the measured acceleration reaches a
`first predefined threshold a_tap_thresh at time t3. End of the tap is detected at
`time t4 when the amplitude decreases below a second threshold
`a_notap_thresh• A valid tap is discriminated based on the amplitude of the
`acceleration, duration between t3 and t4, frequency of the amplitude
`signal, and/ or slope of the acceleration signal.
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`10
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`[0048]
`Figure 5 illustrates a signal s produced by the touch controller 24
`15 during a tap. This signal might be a combination between signals from
`different electrodes of the touch panel, or a signal processed from different
`signals of the electrodes. In one embodiment, the signal s is related to the
`probability of a tap, based on criteria like the size of the contact area, the
`frequency and timing of the contact signal, etc. The touch panel 3b and
`touch controller 24 are preferably in low power mode until time t3 when
`the accelerometer 23 detects a tap and generates a first wake up signal 23.
`At time ts, the signal s reaches a threshold S_tap_thresh where the touch
`controller 24 detects a tap. End of the tap is detected at time tG when the
`signal s decreases below the threshold S_notap_thresh
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`[0049]
`Figure 6 illustrates a second wake up signal 240 generated by the
`touch controller 24 or by a suitable circuit for switching the microcontroller
`21 from a first low power mode to a second high power mode. The wake
`up signal is inactive until time ts when a tap is detected by the inertial
`sensor and confirmed by the touch sensor. The microcontroller 21, and
`preferably the display of the touch panel 3b, is preferably activated at the
`rising flank of the signal 240 at time ts. This signal becomes inactive at time
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`Petitioner Samsung Ex-1032, 0018
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`t4 or tG, at the end of the tap, although this does not result in changing the
`power mode of the device 1.
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`Other methods of combining indications of the inertial sensor 23 and of the
`touch sensor 3b could be considered by the skilled person, including
`5 methods using additional wake up circuitry for discriminating between a
`tap gesture and no tap based on indication of the two sensors. The
`described example has the advantage that the number of components
`which need to be in an active power mode for discriminating a tap is very
`limited; in fact only the inertial sensor with integrated signal processing is
`required. In particular, no advanced signal processing capabilities are
`required in order to discriminate between a tap and other gestures or
`displacements of the watch with the accelerometer; the limited signal
`processing possibilities available in current mems-based accelerometers are
`sufficient.
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`10
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`Discrimination between a gesture and no gesture could be made
`[0050]
`within the processing means of the inertial sensor, by the touch controller
`24, by the microcontroller 21, by a dedicated circuit (not shown), or by any
`combination thereof. Hardware and/or software modules could be used for
`this discrimination.
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`Petitioner Samsung Ex-1032, 0019
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`15
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`Claims
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`smartc-3-ch
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`A method for switching a device (1) from a first power mode
`1.
`to a second power mode, comprising:
`using an inertial sensor (23) for detecting a gesture on a cover
`glass (3a) of said device;
`using a touch panel (3b) underneath said cover glass (3a) for
`detecting said gesture;
`combining gesture detection by the inertial sensor (23) and
`gesture detection with the touch panel (3b) for triggering a switch from
`said first power mode to said second power mode.
`
`The method of claim 1, wherein said inertial sensor (23)
`2.
`comprises an accelerometer with embedded signal processing capabilities
`that discriminates between gesture and no gesture based on the frequency
`of an acceleration signal.
`
`The method of one of the claims 1 or 2, wherein said inertial
`3.
`sensor (23) comprises a three dimensional accelerometer with embedded
`signal processing capabilities that discriminates between gesture and no
`gesture based on the direction of an acceleration signal.
`
`The method of one of the claims 1 to 3, wherein said inertial
`4.
`sensor (23) comprises an accelerometer with embedded signal