THAT IN A MI A BA BA MI NA MATUMAINITTUR
`
`US009823784B2
`
`( 12 ) United States Patent
`Sleeman et al .
`
`( 10 ) Patent No . :
`( 45 ) Date of Patent :
`
`US 9 , 823 , 784 B2
`Nov . 21 , 2017
`
`( 54 ) CAPACITIVE TOUCH SCREEN WITH NOISE
`SUPPRESSION
`( 75 ) Inventors : Peter Sleeman , Hants ( GB ) ; Samuel
`Brunet , Hamble ( GB ) ; Matthew
`Trend , Hants ( GB ) ; Harald Philipp ,
`Hamble ( GB )
`( 73 ) Assignee : Atmel Corporation , San Jose , CA ( US )
`Subject to any disclaimer , the term of this
`( * ) Notice :
`patent is extended or adjusted under 35
`U . S . C . 154 ( b ) by 1196 days .
`( 21 ) Appl . No . : 12 / 421 , 705
`Apr . 10 , 2009
`( 22 )
`Filed :
`Prior Publication Data
`( 65 )
`US 2010 / 0044122 A1 Feb . 25 , 2010
`Related U . S . Application Data
`( 60 ) Provisional application No . 61 / 044 , 038 , filed on Apr .
`10 , 2008 .
`( 51 ) Int . Ci .
`G06F 3 / 044
`GOLD 5 / 24
`( 52 ) U . S . CI .
`CPC . . . . . . . . . . . . . G06F 3 / 044 ( 2013 . 01 ) ; GOIB 7 / 003
`( 2013 . 01 ) ; GOLD 5 / 2405 ( 2013 . 01 ) ; G06F
`1 / 16 ( 2013 . 01 ) ;
`
`( 2006 . 01 )
`( 2006 . 01 )
`( Continued )
`
`CN
`EP
`
`( 56 )
`
`References Cited
`U . S . PATENT DOCUMENTS
`3 / 1998 Philipp
`5 , 730 , 165 A
`9 / 2002 Philipp
`6 , 452 , 514 B1
`( Continued )
`FOREIGN PATENT DOCUMENTS
`. . . . . . . . . . . . . GO6F 3 / 042
`101101525
`1 / 2008
`1821175 A1
`8 / 2007
`( Continued )
`OTHER PUBLICATIONS
`“ 2009 _ Conductive Inkjet Technology " , [ online ] . [ retrieved Apr .
`20 , 2010 ] . Retrieved from the Internet : < URL : http : / / www .
`conductiveinkjet . com / about - us / latest - news / 2009 . aspx > , 1 pg .
`( Continued )
`Primary Examiner — Amare Mengistu
`Assistant Examiner — Shawna Stepp Jones
`( 74 ) Attorney , Agent , or Firm — Baker Botts L . L . P .
`ABSTRACT
`( 57 )
`A capacitive touch sensor wherein the touch sensitive panel
`has drive electrodes arranged on the lower side of a substrate
`and sense electrodes arranged on the upper side . The drive
`electrodes are shaped and dimensioned to substantially
`entirely cover the touch sensitive area with individual drive
`electrodes being separated from each other by small gaps ,
`the gaps being so small as to be practically invisible . The
`near blanket coverage by the drive electrodes also serves to
`screen out interference from noise sources below the drive
`electrode layer , such as drive signals for an underlying
`display , thereby suppressing noise pick - up by the sense
`electrodes that are positioned above the drive electrodes .
`3 Claims , 10 Drawing Sheets
`
`G06F 3 / 044
`
`( 58 )
`
`( Continued )
`Field of Classification Search
`CPC .
`
`( Continued )
`
`103
`
`Z
`
`102
`
`101
`arzana 777777777 ZZZZZ
`
`www
`
`ZZZ
`101
`
`ZA
`
`102
`
`Petitioner STMICROELECTRONICS, INC.,
`Ex. 1010, IPR2021-01160 Page 1 of 22
`
`

`

`( 51 ) Int . Cl .
`HO3K 17796
`GOIB 7700
`GO6F 3 / 041
`G06F 1 / 16
`H05K 1 / 02
`U . S . CI .
`???
`G06F 3 / 0412 ( 2013 . 01 ) ; G06F 3 / 0416
`( 2013 . 01 ) ; HO3K 17 / 9622 ( 2013 . 01 ) ; H05K
`1 / 0296 ( 2013 . 01 ) ; GOIB 2210 / 58 ( 2013 . 01 ) ;
`G06F 2203 / 04111 ( 2013 . 01 ) ; G06F
`2203 / 04112 ( 2013 . 01 )
`( 58 ) Field of Classification Search
`. . . . . . . . 178 / 18 ; 345 / 173
`USPC . . . . . . . . . . . .
`See application file for complete search history .
`References Cited
`U . S . PATENT DOCUMENTS
`7 , 148 , 704 B2
`12 / 2006 Philipp
`7 , 511 , 702 B2 *
`3 / 2009 Hotelling
`7 , 663 , 607 B2
`2 / 2010 Hotelling
`7 , 864 , 503 B2
`1 / 2011 Chang
`7 , 875 , 814 B2
`1 / 2011 Chen
`7 , 920 , 129 B2
`4 / 2011 Hotelling
`8 , 031 , 094 B2
`10 / 2011 Hotelling
`8 , 031 , 174 B2
`10 / 2011 Hamblin
`8 , 040 , 326 B2
`10 / 2011 Hotelling
`8 , 049 , 732 B2
`11 / 2011 Hotelling
`8 , 179 , 381 B2
`5 / 2012 Frey
`8 , 217 , 902 B2
`7 / 2012 Chang
`2007 / 0062739 A1 3 / 2007 Philipp
`345 / 173
`2007 / 0257894 A1 *
`11 / 2007 Philipp
`2008 / 0062139 A1 *
`3 / 2008 Hotelling et al . . . . . . . . . . . . . 345 / 173
`2008 / 0309635 Al 12 / 2008 Matsuo
`2009 / 0315854 Al 12 / 2009 Matsuo
`2012 / 0242588 AL
`9 / 2012 Myers
`2012 / 0242592 AL
`9 / 2012 Rothkopf
`2012 / 0243151 A1 9 / 2012 Lynch
`2012 / 0243719 Al
`9 / 2012 Franklin
`2013 / 0076612 A1 3 / 2013 Myers
`FOREIGN PATENT DOCUMENTS
`. . . . . . . . . . . . G06F 3 / 041
`1 840 714 Al
`10 / 2007
`1 / 2009
`2009007704 AL
`
`US 9 , 823 , 784 B2
`Page 2
`
`345 / 173
`
`WO
`WO
`WO
`
`2009016382 A2
`2009027629 AL
`WO 2012 / 129247
`
`2 / 2009
`3 / 2009
`9 / 2012
`
`OTHER PUBLICATIONS
`“ Cambrios Technologies Corporation Awarded Department of
`Defense Contract for Flexible Solar Cells ” , [ online ] . [ retrieved Apr .
`20 , 2010 ] . Retrieved from the Internet : < URL : < http : / / www .
`cambrios . com / 200 / DOD _ Release . htm > , ( Apr . 12 , 2010 ) , 2 pgs .
`“ New Silver Conductive Inks Target High - Growth Touch Screen
`and OLED Markets ” , [ online ] . [ retrieved Apr . 20 , 2010 ] . Retrieved
`from the Interent : < URL : http : / / www2 . dupont . com / MCM / en _ US /
`news _ events / article20100413 . htrnl > , ( Apr . 13 , 2010 ) , 3 pgs .
`“ Printing of Antennas and Flexible Circuits ” , Core Applications &
`Technologies , © 2009 Conductive Inkjet Technology Ltd . , ( Oct .
`2009 ) , 23 pgs .
`Hörteis , M . , et al . , “ Fine Line Printed and Plated Contacts on High
`OHMIC Emitters Enabling 20 % Cell Efficiency ” , 2009 34th IEEE
`Photovoltaic Specialists Conference ( PVSC ) , ( 2009 ) , 000060
`00065 .
`Atmel Corporation , “ Touch Sensors Design Guide ” ; Jan . 22 , 2009 ;
`http : / / www . atmel . com / dyn / resources / prod _ documents / doc 10620 .
`pdf .
`Chinese First Office Action and English Translation of the Text of
`the First Office Action for Application No . 200910134421 . 2 ; 15
`pages , dated Jul . 17 , 2012 .
`Questel English Translation of Chinese Patent No . CN 101101525 ;
`9 pages , dated Aug . 21 , 2012 .
`U . S . Appl . No . 61 / 454 , 936 , filed Mar . 21 , 2011 , Myers .
`U . S . Appl . No . 61 / 454 , 950 , filed Mar . 21 , 2011 , Lynch
`U . S . Appl . No . 61 / 454 , 894 , filed Mar . 21 , 2011 , Rothkopf .
`The Patent Office of the People ' s Republic of China ; Second Office
`Action and English Translation of Text of the Second Office Action
`for Chinese Patent Application No . 200910134421 . 2 ; 15 pages ,
`dated May 9 , 2013 .
`Chinese Fifth Office Action and English Translation of the Text of
`the Fifth Office Action Issued by State Intellectual Property Office
`for Application No . 200910134421 . 2 , 14 pages , dated Dec . 22 ,
`2014 .
`Taiwan Office Action and English Translation of the Text of the
`Office Action Issued by Intellectual Property Office for Application
`No . 098112108 , 12 pages , dated Apr . 9 , 2015 .
`* cited by examiner
`
`( 2006 . 01 )
`( 2006 . 01 )
`( 2006 . 01 )
`( 2006 . 01 )
`( 2006 . 01 )
`
`( 52 )
`
`( 56 )
`
`EP
`WO
`
`Petitioner STMICROELECTRONICS, INC.,
`Ex. 1010, IPR2021-01160 Page 2 of 22
`
`

`

`atent
`
`Nov . 21 , 2017
`
`Sheet 1 of 10
`
`US 9 , 823 , 784 B2
`
`103
`
`101
`
`104
`1025
`
`101
`
`101
`
`FIG . IA
`
`102
`
`101
`
`FIG . 1B
`
`FIG . IC
`
`Petitioner STMICROELECTRONICS, INC.,
`Ex. 1010, IPR2021-01160 Page 3 of 22
`
`

`

`atent
`
`Nov . 21 , 2017
`
`Sheet 2 of 10
`
`US 9 , 823 , 784 B2
`
`KTM
`
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`
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`
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`204
`
`FIG . 2A
`
`t
`
`FIRST AXIS
`202
`
`Petitioner STMICROELECTRONICS, INC.,
`Ex. 1010, IPR2021-01160 Page 4 of 22
`
`

`

`atent
`
`Nov . 21 , 2017
`
`Sheet 3 of 10
`
`US 9 , 823 , 784 B2
`
`nunununull
`
`FIG . 2B
`
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`
`Petitioner STMICROELECTRONICS, INC.,
`Ex. 1010, IPR2021-01160 Page 5 of 22
`
`

`

`Us podent m . com
`
`Nov . 21 , 2017
`
`atent
`
`Sheet 4 of 10
`
`US 9 , 823 , 784 B2
`
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`FIG . 5A
`
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`1417 + + +
`
`FIG . 5B
`
`Petitioner STMICROELECTRONICS, INC.,
`Ex. 1010, IPR2021-01160 Page 6 of 22
`
`

`

`atent
`
`Nov . 21 , 2017
`
`Sheet 5 of 10
`
`US 9 , 823 , 784 B2
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`
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`
`FIG . 7A
`
`Petitioner STMICROELECTRONICS, INC.,
`Ex. 1010, IPR2021-01160 Page 7 of 22
`
`

`

`atent
`
`Nov . 21 , 2017
`
`Sheet 6 of 10
`
`US 9 , 823 , 784 B2
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`Petitioner STMICROELECTRONICS, INC.,
`Ex. 1010, IPR2021-01160 Page 8 of 22
`
`

`

`atent
`
`Nov . 21 , 2017
`
`Sheet 7 of 10
`
`US 9 , 823 , 784 B2
`
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`FIG . 9
`
`Petitioner STMICROELECTRONICS, INC.,
`Ex. 1010, IPR2021-01160 Page 9 of 22
`
`

`

`atent
`
`Nov . 21 , 2017
`
`Sheet 8 of 10
`
`US 9 , 823 , 784 B2
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`
`Petitioner STMICROELECTRONICS, INC.,
`Ex. 1010, IPR2021-01160 Page 10 of 22
`
`

`

`atent
`
`Nov . 21 , 2017
`
`Sheet 9 of 10
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`US 9 , 823 , 784 B2
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`Petitioner STMICROELECTRONICS, INC.,
`Ex. 1010, IPR2021-01160 Page 11 of 22
`
`

`

`atent
`
`Nov . 21 , 2017
`
`Sheet 10 of 10
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`US 9 , 823 , 784 B2
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`
`Petitioner STMICROELECTRONICS, INC.,
`Ex. 1010, IPR2021-01160 Page 12 of 22
`
`

`

`US 9 , 823 , 784 B2
`
`5
`
`15
`
`accuracy of the reported touch location i . e . correspon
`CAPACITIVE TOUCH SCREEN WITH NOISE
`SUPPRESSION
`dence between real physical location and reported
`location . This is broadly known as “ linearity ” or “ non
`linearity ” when referring to the measured error .
`BACKGROUND OF THE INVENTION
`immunity of the sensor to external electrical noise
`sources .
`The following describes a new invention in the field of
`sensitivity of the sensor to human touch i . e . its ability to
`capacitive touch screens or 2 - dimensional capacitive trans
`detect a touch through thicker panel materials , or to
`ducing ( 2DCT ) sensors . U . S . Pat . No . 6 , 452 , 514 , U . S . Pat .
`detect a lighter or smaller touch .
`No . 7 , 148 , 704 and U . S . Pat . No . 5 , 730 , 165 disclose a
`spatial resolution of the sensor i . e . its ability to report
`capacitive measurement technique which makes it possible 10
`small changes in touch location .
`to create touch responsive transparent or opaque sensing
`quality of the output in terms of the noise or jitter
`regions that can detect human touch through several milli
`amplitude in the reported location .
`meters of plastic or glass . Described herein is a new struc
`optical quality of the sensor for the transmission of light ,
`ture for a touch screen that allows significant enhancement 15
`for factors like its transparency , its hue , its haze , the
`in both operation and appearance of the sensor .
`overall electrode pattern visibility etc .
`U . S . Pat . No . 6 , 452 , 514 describes a capacitive measure
`optical behavior of the sensor to shallow angle reflected
`light i . e . the visibility of the electrode pattern and any
`ment technique which is incorporated by reference herein ,
`color shifts in the reflected light .
`that uses a transmit - receive process to induce charge across
`minimizing any errors induced in the reported location
`the gap between an emitting electrode and a collecting 20
`electrode ( the transmitter and the receiver respectively , also
`caused by slight mechanical flexing during human
`referred to as X and Y ) . The capacitive sensing described in
`touch . This tends to cause a change in the distance
`between the sensor and any underlying display or other
`U . S . Pat . No . 6 , 452 , 514 may be referred to as mutual
`capacitive or active type 2DCT sensors . As a finger touch
`mechanical grounded structure which in turn causes
`capacitive changes similar to a touch .
`interacts with the resulting electric field between the trans - 25
`reducing the electrical resistance of the electrodes to
`mitter and receiver electrodes , the amount of charge coupled
`allow efficient capacitive sensing within an acceptable
`from transmitter to receiver is changed . A particular feature
`time ( often the overall measurement time of the touch
`of the measurement technique is that most of the electric
`charge tends to concentrate near to sharp corners and edges
`screen needs to be at or below 10 ms so limiting the
`amount of settling time that can be used to make each
`( a well known effect in electrostatics ) . The fringing fields 30
`between transmitter and receiver electrodes dominate the
`measurement ) .
`reducing the number of layers in the physical construction
`charge coupling . The electrode design therefore tends to
`to minimize manufacturing cost and to improve optical
`focus on the edges and the gaps between neighboring
`properties .
`transmitter and receiver electrodes in order to maximize
`reducing side - effects in the quality of reported coordinates
`coupling and also to maximize the ability of a touch to 35
`or in the ability of the sensor to detect a touch , near to
`interrupt the electric field between the two , hence giving the
`the edges of the sensor . This region typically presents
`biggest relative change in measured charge . Large changes
`are desirable as they equate to higher resolution and equally
`difficult challenges in this regard because of the non
`uniformity of the electrode pattern ( its ends ) and the
`to better signal to noise ratio .
`fact that interconnecting tracks tend to reside at the
`Aspecially designed control chip can detect these changes 40
`edges of the sensor .
`in charge . It is convenient to think of these changes in charge
`reducing the total number of electrodes used as each
`as changes in measured coupling capacitance between trans
`electrode requires some connection to the control chip
`mitter and receiver electrodes ( charge is rather harder to
`and so more electrodes equates to a more complex chip
`visualize ) . The chip processes the relative amounts of
`and hence higher cost .
`capacitive change from various places around the touch 45
`In order to optimize linearity , the electrode pattern design
`screen and uses this to compute the absolute location of
`is critical . Linearity is one of the primary measures of
`touch as a set of x and y coordinates . In order for this to be
`quality of a touch screen because as the linearity degrades ,
`possible a set of spatially distributed electrodes must be
`it becomes harder to report an accurate touch location in
`used . Commonly , these electrodes are required to be trans -
`parent so that the touch screen can operate in front of a 50 some regions of the screen . A sensor design that offers
`display such as a liquid crystal display ( LCD ) screen or other
`excellent intrinsic linearity is a key goal therefore . While it
`display screen type , for example organic light emitting diode
`is possible to mathematically correct such non - linearity via
`( OLED ) type screens . To achieve this electrodes are often
`well known techniques such as a look - up table or piecewise
`fabricated from a material known as Indium Tin Oxide ( ITO )
`linear correction , any of these methods actually trades off
`but other transparent conductive materials are also suitable . 55 spatial resolution for reported linearity , and so is always a
`ITO has desirable properties in optical terms , but can be
`compromise .
`substantially ohmic which can have a negative impact on
`In designing the electrodes a key objective is to arrange
`capacitive measurements if the resistance and capacitance
`that the electric field that propagates from transmitter to
`combination leads to time constants that prevent timely
`receiver does so in a way that causes a smooth and progres
`settling of the charge transfer process .
`60 sive gradation from one electrode to the next . This way , as
`Another
`example
`2DCT is
`disclosed
`in
`a touch moves from region to region , the capacitive change
`measured by the control chip also changes in a smooth and
`US20070062739A1 .
`In order to create a sensor that can report the absolute
`progressive way and hence contributes to good intrinsic
`linearity . The touch itself actually influences this process
`coordinates of the location of the touch ( or more than one
`touch ) on the surface of the sensor or the overlying plastic 65 significantly and will tend to “ mix ” the fields from neigh
`or glass panel , the electrode arrangement must be specifi -
`boring electrodes . This contributes to the overall smoothness
`cally designed to optimize the following aspects :
`of transition , but does tend to lead to some variation in
`
`Petitioner STMICROELECTRONICS, INC.,
`Ex. 1010, IPR2021-01160 Page 13 of 22
`
`

`

`US 9 , 823 , 784 B2
`
`15
`
`ments performed . Thus , the sensor can be arranged to
`linearity depending on the size of the touch applied . Again ,
`effectively pick up the noise output from a display screen
`electrode design needs to be carefully considered to opti
`and automatically synchronize the charge - transfer bursts to
`mize the linearity across a range of touch sizes .
`occur during stages of the noise output cycle .
`As described above the quality of the output in terms of
`However , noise reduction techniques such as those
`the noise or jitter amplitude in the reported location should 5
`described above require more complex measurement cir
`be optimized . However , 2DCT sensors can be sensitive to
`cuitry . This makes the measurement circuitry more expen
`external ground loading . Furthermore , electrical noise gen
`sive and may increase the time taken to complete an acqui
`erated from LCD screens can interfere with capacitance
`sition cycle .
`measurements when a pointing object approaches the
`It would therefore be desirable to provide an electrode
`screen . Known methods to minimize the effects of noise on 10
`pattern suitable for mutual capacitive or active type 2DCT
`capacitive coupling is to increase the separation or air gap
`sensor that can be embodied with an electrode pattern with
`between an LCD screen and an overlaying 2DCT sensor .
`reduced noise pick - up .
`Alternatively a shielding layer may be incorporated between
`the LCD screen and a 2DCT sensor to reduce or block the
`SUMMARY OF THE INVENTION
`noise induced by the LCD screen .
`WO 2009 / 027629 published on 5 Mar . 2009 describes a
`According to a first aspect of the invention , a capacitive
`capacitive touch sensor comprising a dielectric panel over
`touch sensor is provided comprising a touch sensitive panel
`lying a drive electrode with two sense electrodes . One of the
`having a plurality of drive electrodes arranged on one side
`sense electrodes is positioned to be shielded from the drive
`electrode by the first sense electrode , so that the first sense 20 of a substrate in
`a first layer and a plurality of sense
`electrode receives the majority of the charge coupled from
`electrodes arranged on the other side of the substrate in a
`the drive electrode and the second sense electrode primarily
`second layer so that the sense electrodes cross the drive
`registers noise . A sensing circuit including two detector
`electrodes at a plurality of intersections offset from each
`channels is connected to the first ( coupled ) and second
`other by the thickness of the substrate , wherein the drive
`( noise ) sense electrodes to receive signal samples respec - 25 electrodes substantially entirely cover the first layer with
`tively . The sensing circuit is operable to output a final signal
`individual ones of the drive electrodes being separated from
`obtained by subtracting the second signal sample from the
`neighboring drive electrodes by small gaps .
`first signal sample to cancel noise .
`This approach has several important advantages . The
`However , the methods described above increase the size
`touch sensor only requires the two layers of electrodes
`and thickness , and may decrease the resolution of a device 30 recited above to function , so that a third noise - suppressing
`incorporating a display screen with a 2DCT sensor when it
`layer as adopted in some prior art designs is superfluous . A
`is more fashionable and desirable to produce smaller
`two layer construction also leads to improved optical trans
`devices . Furthermore , additional steps are required during
`mission , thinner overall depth and lower cost compared with
`manufacture and as a result there is an increased cost due to
`designs with a greater numbers of layers . The area - filling
`further components being needed .
`35 design for the drive electrodes with small gaps allows for an
`European patent EP 1821175 describes an alternative
`almost invisible drive electrode pattern , for example when
`solution to reduce the noise collected on a 2DCT touch
`using ITO , and also isolates the sense lines from capacitive
`sensor . EP 1821175 discloses a display device with a touch
`effects below the first layer , for example noise from an
`sensor which is arranged so that the two dimensional touch
`underlying LCD module or other noise source . The “ flood
`sensor is overlaid upon a display device to form a touch 40 ing ” of the first layer with conductive material also allows
`sensitive display screen . The display device uses an LCD
`the second layer to be implemented with narrow sense
`arrangement with vertical and horizontal switching of the
`electrodes , far narrower than the dimension of the sensing
`LCD pixels . The touch sensing circuit includes a current
`object . The second layer can also be made invisible either
`detection circuit , a noise elimination circuit as well as a
`through in - filling of islands of electrode material between
`sampling circuit for each of a plurality of sensors , which are 45 the sense electrodes to also " flood ” the second layer , or
`arranged to form the two - dimensional sensor array . The
`alternatively simply by making the sense electrodes very
`current detection circuit receives a strobe signal , which is
`thin or very sparse with line widths so small that they are
`generated from the horizontal and vertical switching signals
`invisible . This sparse approach using meshes is described
`of the LCD screen . The strobe signal is used to trigger a
`further below . The reduced sense electrode area also reduces
`blanking of the current detection circuit during a period in
`50 susceptibility to coupling noise from touches .
`which the horizontal switching voltage signal may affect the
`The drive electrodes are preferably separated by a pitch of
`comparable dimension to the touch size of the touching
`measurements performed by the detection circuit .
`WO 2009 / 016382 published on 5 Feb . 2009 describes a
`object for which the sensor is designed
`sensor used to form a two dimensional touch sensor , which
`The touching object for which the sensor is designed may
`can be overlaid on a liquid crystal display ( LCD ) screen . As 55 be a finger , e . g . of touch size 8 - 10 mm diameter , and the
`such , the effects of switching noise on the detection of an
`pitch is around 8 mm or less . A stylus could also be used .
`object caused by a common voltage signal of the LCD
`The small gaps between adjacent drive electrodes are
`screen can be reduced . The sensor comprises a capacitance
`preferably dimensioned to be sufficiently small to be invis
`measurement circuit operable to measure the capacitance of
`ible or almost invisible , for example less than around 100
`the sensing element and a controller circuit to control 60 micrometers , preferably having dimensions of a few tens of
`charging cycles of the capacitance measurement circuit . The
`micrometers .
`controller circuit is configured to produce charging cycles at
`The sense electrodes are advantageously narrow in com
`a predetermined time and in a synchronous manner with a
`parison to the size of the touching object . For example , the
`noise signal . For example , the charge - transfer cycles or
`sense electrodes may have a line width of one quarter or less
`' bursts ' may be performed during certain stages of the noise 65 of the size of the touching object . In one embodiment , the
`output signal from the display screen , i . e . at stages where
`touching object for which the sensor is designed is a finger
`noise does not significantly affect the capacitance measure -
`with a touch size of 8 - 10 mm diameter , and the sense
`
`Petitioner STMICROELECTRONICS, INC.,
`Ex. 1010, IPR2021-01160 Page 14 of 22
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`US 9 , 823 , 784 B2
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`different substrates which can then be assembled in engage
`electrodes have a line width of 2 mm or less , for example 0 . 5
`ment with each other to provide an offset between the two
`mm . The sense electrodes may have a line width one quarter
`or less than the pitch of the drive electrodes .
`layers equal to the thic