US20140267951A1 - Digitizer and method of manufacturing the same - Google Patents
Digitizer and method of manufacturing the same Download PDFInfo
- Publication number
- US20140267951A1 US20140267951A1 US14/198,820 US201414198820A US2014267951A1 US 20140267951 A1 US20140267951 A1 US 20140267951A1 US 201414198820 A US201414198820 A US 201414198820A US 2014267951 A1 US2014267951 A1 US 2014267951A1
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- US
- United States
- Prior art keywords
- layer
- magnetic field
- field shielding
- digitizer
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
Abstract
A method of manufacturing a digitizer includes forming a circuit layer that detects an input, forming a magnetic field shielding layer that contains disoriented magnetic powder, disposing an adhesive between the circuit layer and the magnetic field shielding layer, and hot pressing the circuit layer and the magnetic field shielding layer so as to orient the magnetic powder.
Description
- This application claims priority under 35 U.S.C. §119(a) to Korean Application Serial No. 10-2013-0027342, which was filed in the Korean Intellectual Property Office on Mar. 14, 2013, the entire contents of which are incorporated herein by reference.
- 1. Technical Field
- The present disclosure relates generally to a digitizer, and more particularly, to a digitizer having a magnetic field shield layer and a method of manufacturing the same.
- 2. Description of the Related Art
- In recent years, markets related to smart phones or touch screens have been rapidly growing. Touch screens are widely used as input devices for mobile terminals. Capacitive touch screens having a transparent electrode and adapted to measure a change in an electrostatic capacity generated by applied pressure from a touch are often used. However, the capacitive touch screen requires a user to contact the touch screen and apply a predetermined pressure or displacement. The touch screen does not accept inputs from a stylus or a pen. In order to overcome the foregoing shortcomings, a touch screen technology using electromagnetic waves has been introduced. This technology uses an Electromagnetic (EM) pointing input unit and a display screen.
- An electronic device equipped with an EM pointing input unit requires a mounting mechanism to mount the unit to the electronic device. Many electronic devices include batteries and circuitry, both of which have the potential to disturb the electromagnetic fields used by the EM pointing input unit.
- Definitions: in this document, when a layer or member is said to be formed or disposed ‘on’ another layer or member, the word “on” is used from the perspective of a fabrication process and thus may be interpreted as “on a top surface” or “on a bottom surface” of the relevant layer as, for example, either “atop” or “underneath”.
- An aspect of the present disclosures to provide a digitizer which reduces or eliminates interference caused by stray electromagnetic fields from circuit components, batteries, and conductors.
- Another aspect of the present disclosure is to provide a digitizer which has a thin mechanical structure and is simple to manufacture.
- In accordance with another aspect of the present disclosure, a method of manufacturing a digitizer includes: forming a circuit layer that detects an input; forming a magnetic field shielding layer that contains disoriented magnetic powder; disposing an adhesive between the circuit layer and the magnetic field shielding layer, and hot pressing the circuit layer and the magnetic field shielding layer so as to orient the magnetic powder.
- In accordance with another aspect of the present disclosure, a digitizer includes: a circuit layer that detects an input; a magnetic field shielding layer disposed on the circuit layer and containing oriented magnetic field powder; and a conductive layer disposed on the magnetic field shielding layer.
- The above and other aspects, features, and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:
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FIG. 1 is a functional block diagram showing a portable terminal according to a set of exemplary embodiments of the present invention; -
FIG. 2 is a front perspective view showing the portable terminal according to a set of exemplary embodiments of the present invention; -
FIG. 3 is a rear perspective view showing the portable terminal according to a set of exemplary embodiments of the present invention; -
FIG. 4 is an exploded perspective view showing a touch screen of the portable terminal; -
FIG. 5 is a plan view and a corresponding cross-sectional view exemplifying a pattern of a second sensor layer of the touch screen; -
FIG. 6 is a perspective view illustrating the touch screen operating as a digitizer; -
FIG. 7 andFIG. 8 are views illustrating principles of magnetic field shielding; -
FIG. 9 is a flowchart showing a method of manufacturing a digitizer according to a first set of exemplary embodiments of the present invention; -
FIG. 10A andFIG. 10B is a diagrammatic representation illustrating a method of manufacturing a digitizer according to the first set of exemplary embodiments of the present invention; -
FIG. 11 is a flowchart showing a method of manufacturing a digitizer according to a second set of exemplary embodiments of the present invention; and -
FIG. 12A ,FIG. 12B ,FIG. 13A ,FIG. 13B ,FIG. 14A andFIG. 14B are views which illustrate methods of manufacturing a digitizer according to the second set of exemplary embodiments of the present invention. - Throughout the drawings, the same or like drawing reference numerals will be understood to refer to the same or like elements, features, and structures.
- The present invention may be variously modified and have various embodiments, so specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it should be understood that the present invention is not limited to the specific embodiments described herein and also includes all modifications, equivalents, and replacements which fall within the scope of the present invention.
- Terms including ordinal numbers, such as first and second, may be used to describe various constituent elements, but the elements are not limited by these terms. The terms are used only to distinguish one element from other elements. For example, a first element may be named a second element without departing from the scope of the present invention, and a second element may be named a first element similarly. The term and/or includes a combination of a plurality of items or any one of a plurality of items.
- The terms used herein are only used to describe specific embodiments and are not intended to limit the present invention. A singular expression includes a plural expression, unless the expression is explicitly defined differently in a given context. In addition, since terms, such as “including,” “comprising,” and “having” mean that one or more corresponding components may exist unless they are specifically described to the contrary, it shall be construed that one or more other components or additional components may be included.
- All words comprising one or more technical or scientific terms have the same meanings that persons skilled in the art understand ordinarily, unless these words are explicitly defined otherwise. A word ordinarily used as defined in a dictionary shall be construed as if the word has a meaning equal to that in the context of a related description, and shall not be construed in an ideal or excessively formal meaning unless it is clearly defined as such in the present specification.
- In the present invention, the term “laminated” may be replaced by the term “disposed”.
- In the present invention, a terminal may be an arbitrary device including a touch screen, and may be referred to as a portable terminal, a mobile terminal, a communication terminal, a portable communication terminal, or a portable mobile terminal.
- For example, the terminal may be a smart phone, a mobile phone, a gaming device, a TV, a display device, a vehicular head unit, a notebook computer, a laptop computer, a tablet computer, a Personal Multimedia Player (PMP), or a Personal Digital Assistant (PDA). The terminal may be realized as a pocket-sized portable communication terminal having a wireless communication function. The terminal may be a flexible device or a flexible display device.
- A representative configuration of the terminal relates to a mobile phone, and some constituent elements of the terminal may be omitted or modified if necessary.
-
FIG. 1 is a functional block diagram showing a portable terminal according to a set of exemplary embodiments of the present invention. - Referring to
FIG. 1 , theportable terminal 100 may be operatively coupled to an external electronic device (not shown) by using at least one of acommunication module 120, aconnector 165, or anearphone connection jack 167. Theportable terminal 100 may, but need not, include any of various devices such as an earphone attached to theportable terminal 100 to be operatively coupled to theportable terminal 100, an external speaker, a Universal Serial Bus (USB) memory, a battery charger, a cradle/dock, an Advanced Television Systems Committee—Mobile/Handheld (ATSC-M/H) antenna, a Digital Media Broadcasting (DMB) antenna, a mobile payment related device, a heath management device (for example, a blood-sugar tester), a gaming device, or a vehicular navigation device. Further, the electronic device may include a wirelessly-accessible Bluetooth communication device, a Near Field Communication (NFC) device, a WiFi direct communication device, or a Wireless Access Point (WAP). Theportable terminal 100 may be connected to one of another portable terminal or an electronic device, for example, a mobile phone, a smart phone, a table PC, a desktop PC, and a server by using wired or wireless communications. - Referring to
FIG. 1 , theportable terminal 100 includes at least onetouch screen 190 and at least onetouch screen controller 195. Theportable terminal 100 includes acontroller 110, acommunication module 120, amultimedia module 140, acamera module 150, an input/output module 160, asensor module 170, astorage unit 175, and apower supply 180. - The
communication module 120 includes amobile communication module 121, asub-communication module 130, and abroadcast communication module 141. - The
sub-communication module 130 includes at least one of a wireless local area network (WLAN)module 131 or a short-range communication module 132, and themultimedia module 140 includes at least one of anaudio playback module 142 or avideo playback module 143. Thecamera module 150 includes at least one of afirst camera 151 or asecond camera 152. Thecamera module 150 may include at least one of abarrel unit 155 for zooming in/out of a first and/or asecond camera motor 154 for controlling zoom in/out movements of thebarrel unit 155, and aflash 153 for providing a light source for photographing. The input/output (I/O)module 160 includes at least one ofbutton 161, amicrophone 162, aspeaker 163, avibration element 164, aconnector 165, or anoptional keypad 166. - The
controller 110 may include a central processing unit (CPU) 111, a read-only memory (ROM) 112 that stores a control program for controlling theportable terminal 100, and a random-access memory (RAM) 113 that stores signals or data input from the outside of theportable terminal 100 or is used as a memory area for operations of theportable terminal 100. TheCPU 111 may include a single core, a dual core, a triple core, or a quad core. TheCPU 111, theROM 112, and theRAM 113 may be operatively coupled to each other through an internal bus. - The
controller 110 may control thecommunication module 120, themultimedia module 140, thecamera module 150, the input/output module 160, thesensor module 170, thestorage unit 175, thepower supply 180, thetouch screen 190, and thetouch screen controller 195. - The
controller 110 detects a user input applied to thetouch screen 190. The user input may be applied using aninput unit 168 such as a pen or a stylus. Alternatively or additionally, the applied input may be in the form of a finger of a user touching an object displayed on thetouch screen 190, the finger of the user approaching an object displayed on the touch screen 109, or the finger of the user being in closer proximity to a first object displayed on the touch screen relative to a plurality of other displayed objects. Thecontroller 110 identifies an object corresponding to a location on thetouch screen 190 where a user input is applied. The user input through thetouch screen 190 includes any of a direct touch input by which an object is directly touched, and a hovering input which is an indirect touch input by which an object is not directly touched, but rather the object is approached within a preset recognizable distance. For example, if theinput unit 168 is located close to and above thetouch screen 190, an object located below theinput unit 168 on thetouch screen 190 may be selected. In the present invention, the user input includes, in addition to a user input through thetouch screen 190, a gesture input through thecamera module 150, a switch/button input through thebutton 161 or thekeypad 166, and a voice input through themicrophone 162. - The object or item (functional item) may be displayed on the
touch screen 190 of theportable terminal 100, and for example, may include at least one of an application, a menu, a document, a widget, a picture, a video, an e-mail, an SMS message, or an MMS message. The object or functional item may be selected, executed, deleted, canceled, stored, or changed by theuser input unit 168. One or more items may be assigned a functional meaning and may include a button, an icon (or shortcut icon), a thumbnail image, or a folder storing at least one object in a portable terminal. The item may be displayed in the form of an image or text. - The shortcut icon is an image displayed on the
touch screen 190 of theportable terminal 100 for a quick launch of a voice communication, a contact address, or a menu provided in an application or theportable terminal 100. The corresponding application is executed if a command or a selection for executing the shortcut icon is input. - The
controller 110 may detect a user input event such as a hovering event as theinput unit 168 approaches thetouch screen 190 or is located close to thetouch screen 190. - If a user input event is generated for a preset item or according to a preset method, the
controller 110 performs a preset program operation corresponding to the user input event. - The
controller 110 may output a control signal to theinput unit 168 or thevibration element 164. The control signal may include information on a vibration pattern, and theinput unit 168 or thevibration element 164 generates vibrations according to the vibration pattern. The information on the vibration pattern may represent a vibration pattern itself and/or an identifier of a vibration pattern. The control signal may simply include only a request for generation of vibrations. - The
portable terminal 100 may include at least one of themobile communication module 121, theWLAN module 131, or the short-range communication module 132. - The
mobile communication module 121 may implement a wireless connection between theportable terminal 100 and an external electronic device by using at least one or a plurality of antennas (not shown) under the control of thecontroller 110. Themobile communication module 121 transmits and receives wireless signals for a voice communication, a video communication, a short message (SMS) or a multimedia message (MMS) to and from a mobile phone (not shown) having a phone number input to theportable terminal 100, a smart phone (not shown), a tablet PC or another electronic device (not shown). - As described previously, the
sub-communication module 130 may include at least one of theWLAN module 131 or the short-range communication module 132. For example, thesub-communication module 130 may include only theWLAN module 131, only the short-range communication module 132, or both theWLAN module 131 and the short-range communication module 132. - The
WLAN module 131 may be connected to the Internet in an area where a Wireless Access Point (WAP) (not shown) is installed under the control of thecontroller 110. Thewireless LAN module 131 may support a wireless LAN standard, such as any of the IEEE 802.11x series of standards developed by the Institute of Electrical and Electronics Engineers (IEEE). The short-range communication module 132 may perform wireless near-field communications between theportable terminal 100 and the external electronic device under the control of thecontroller 110. The near field communication method may include any of a Bluetooth communication, an Infrared Data Association (IrDA) communication, a WiFi-Direct communication, and a Near Field Communication (NFC). - The
controller 110 may transmit a control signal according to a vibration pattern to theinput unit 168 through thesub-communication module 130. - The
broadcast communication module 141 may receive broadcasting signals (for example, a TV broadcasting signal, a radio broadcasting signal, or a data broadcasting signal) transmitted from a broadcasting station, as well as optional broadcast-added information (for example, an Electronic Program Guide (EPG), an Electronic Service Guide (ESG), or Radio Data System (RDS) text) under the control of thecontroller 110 through a broadcast communication antenna. - The
multimedia module 140 may include anaudio playback module 142 or avideo playback module 143. Theaudio playback module 142 may reproduce a digital audio file (for example, a file whose extension is mp3, wma, ogg, or way) that is stored in or received from thestorage unit 175 under the control of thecontroller 110. Thevideo playback module 143 may reproduce a digital video file (for example, a file whose extension is mpeg, mpg, mp4, avi, mov, or mkv) that is stored in or received from thestorage unit 175 under the control of thecontroller 110. - The
multimedia module 140 may, but need not, be integrated with thecontroller 110. - The
camera module 150 may include at least one of afirst camera 151 and asecond camera 152 for photographing a still image or a video under the control of thecontroller 110. Thecamera module 150 may include at least one of abarrel unit 155 for performing zooming in/out to photograph a subject, amotor 154 for controlling movements of thebarrel unit 155, and aflash 153 for providing an auxiliary light source that may be used to photograph a subject. Illustratively, thefirst camera 151 may be disposed on a front surface of theportable terminal 100 and thesecond camera 152 may be disposed on a rear surface of theportable terminal 100. - The first and
second cameras second cameras controller 110. A user may photograph a video or a still image through the first andsecond cameras - The I/
O module 160 may, but need not, include at least one of the following: at least onebutton 161, at least onemicrophone 162, at least onespeaker 163, at least onevibration element 164, theconnector 165, thekeypad 166, theearphone connecting jack 167, and theinput unit 168. The I/O module 160 is not limited to any of the foregoing items, as, a cursor control such as a mouse, a track ball, a joystick or a cursor direction key may be used to implement the I/O module 160 to control a movement of a cursor on thetouch screen 190. - The
button 161 may be formed on a front surface, a side surface, or a rear surface of the housing (case) of theportable terminal 100, and may include at least one of a power/lock button, a volume button, a menu button, a home button, a back button, or a search button. - The
microphone 162 receives a voice or a sound to generate an electrical signal under the control of thecontroller 110. - The
speaker 163 may output a sound or acoustic vibrations corresponding to various signals or data (for example, wireless data, broadcast data, digital audio data, and digital video data) to the surrounding environment of theportable terminal 100 under the control of thecontroller 110. Thespeaker 163 may output one or more sounds. For example, a first beep or other audible annunciation corresponding to an incoming voice communication may be provided, as well as a second beep or audible annunciation corresponding to a voice communication connecting indication. Thespeaker 163 may also output and a voice of a counterpart user engaging in the now-connected voice communication. One or a plurality ofspeakers 163 may be provided at a location or locations of the housing of theportable terminal 100. - The
vibration element 164 may convert an electrical signal into a mechanical vibration under the control of thecontroller 110. For example, when theportable terminal 100 in a vibration mode receives a voice or video call from another device (not shown), thevibration element 164 may be activated. One or a plurality ofvibration elements 164 may be provided within the housing of theportable terminal 100. Thevibration element 164 may be operated to correspond to a user input received or accepted through thetouch screen 190. - The
connector 165 may be used as an interface for connecting theportable terminal 100 to an external electronic device or a power source (not shown). Thecontroller 110 may transmit data stored in thestorage unit 175 of theportable terminal 100 or receive data from an external electronic device through a cable connected to theconnector 165. Theportable terminal 100 may receive electric power from a power source through a wired cable connected to theconnector 165, or a battery (not shown) provided within theportable terminal 100 may be charged by using a power source. - The
keypad 166 may receive or accept a key input from the user to control theportable terminal 100. Thekeypad 166 includes a physical keypad (not shown) provided by theportable terminal 100 or a virtual keypad (not shown) provided by thetouch screen 190. The physical keypad provided by theportable terminal 100 may be excluded. - An earphone (not shown) may be inserted into the
earphone connecting jack 167 for connection to theportable terminal 100. - The
input unit 168 may be inserted into theportable terminal 100 to be secured while theportable terminal 100 is not in use. Theinput unit 168 may be extracted or separated from theportable terminal 100 during use thereof. An attachment/detachment recognition switch 169 activated in response to mounting and attachment as well as detachment of theinput unit 168 is provided in one area of the interior of theportable terminal 100 into which theinput unit 168 is inserted. The attachment/detachment recognition switch 169 may output a first signal corresponding to mounting of theinput unit 168 to thecontroller 110 and a second signal corresponding to separation of theinput unit 168 and thecontroller 110. Alternatively or additionally, the switch may be placed into a first state corresponding to mounting of theinput unit 168 to thecontroller 110, wherein the switch is placed into a second state corresponding to separation of theinput unit 168 from thecontroller 110. The first state may, but need not, be a substantially open circuit and the second state may, but need not, be a substantially closed circuit. Alternatively, the first state may, but need not, be a substantially closed circuit and the second state may, but need not, be a substantially open circuit. The attachment/detachment recognition switch 169 may be configured to directly or indirectly contact theinput unit 168 when theinput unit 168 is mounted. Accordingly, the attachment/detachment recognition switch 169 may generate a signal corresponding to mounting or separation of the input unit 168 (that is, a signal for reporting mounting or separation of the input unit 168). The corresponding signal is output to thecontroller 110 based on a contact with theinput unit 168. Alternatively, the attachment/detachment recognition switch 169 may change from a first state to a second state to thereby cause generation of a signal by thecontroller 110 or another circuit element. - The
sensor module 170 includes at least one sensor for detecting a state of theportable terminal 100. For example, thesensor module 170 may include at least one of: a proximity sensor (not shown) for detecting an approach of a user to theportable terminal 100, a luminance sensor (not shown) for detecting an amount of light around theportable terminal 100, a motion sensor (not shown) for detecting an operation of the portable terminal 100 (for example, rotation of theportable terminal 100, and acceleration or vibration of the portable terminal 100), a geomagnetic sensor (not shown) for detecting a point of a compass of theportable terminal 100 by using a magnetic field of the earth, a gravity sensor (not shown) for detecting an operational direction of gravity, an altimeter (not shown) for measuring the pressure of the atmosphere to detect an altitude of theportable terminal 100, or aGPS module 157. - The
GPS module 157 may receive electric waves from a plurality of GPS satellites (not shown) in orbit around the Earth, and may calculate a position of theportable terminal 100 by using arrival times for a plurality of RF signals transmitted by the GPS satellites and received by theportable terminal 100. - The
storage unit 175 may store signals or data input or output by any of thecommunication module 120, themultimedia module 140, thecamera module 150, the input/output module 160, thesensor module 170 or thetouch screen 190 under the control of thecontroller 110. Thestorage unit 175 may store a control program for control of theportable terminal 100 or thecontroller 110. Thestorage unit 175 may also store one or more applications. - As used herein, the term “storage unit” is used to refer to the
storage unit 175, theROM 112 in thecontrol unit 110, theRAM 113, an arbitrary data storage unit such as a memory card (for example, an SD card or a memory stick) mounted to theportable terminal 100. Thestorage unit 175 may include a nonvolatile memory, a volatile memory, a Hard Disk Drive (HDD), a Solid State Drive (SSD), or any of various combinations thereof. - The
storage unit 175 may store navigational information, video communications, one or more games, images used by applications for providing various functions such as an alarm application based on time, Graphical User Interfaces (GUIs) related to one or more user applications, user information, one or more documents, one or more databases, data related to a method of processing a touch input, background images (a menu screen, a standby screen, and the like), operating programs necessary for driving theportable terminal 100, or images photographed by thecamera module 150. - The
storage unit 175 is a non-transitory medium readable by a machine (for example, a computer). The term machine-readable medium may be defined as a non-transitory medium which provides data or instructions or both to a machine so that the machine can perform one or more specific functions. Thestorage unit 175 may include a nonvolatile medium, or a volatile medium, or a combination of a volatile medium and a non-volatile medium. All of the mediums should be concrete, tangible, and non-transitory so that the commands transferred by the mediums can be detected by a physical device that reads the commands into the machine. - The machine-readable medium includes at least one of a floppy disk, a flexible disk, a hard disk, a magnetic tape, a Compact disk Read Only Memory (CDROM), an optical disk, a punch card, a paper tape, a RAM, a Programmable Read Only Memory (PROM), an Erasable PROM (EPROM), and a flash-EPROM, but is not limited thereto.
- The
power supply 180 may supply electric power to one or a plurality of batteries disposed in the housing of theportable terminal 100 under the control of thecontroller 110. The one or plurality of batteries supply electric power to theportable terminal 100. Thepower supply 180 may supply the electric power input from an external power source to theportable terminal 100 through a wired cable connected to theconnector 165. Alternatively or additionally, thepower supply 180 may supply the electric power wirelessly input from an external power source to theportable terminal 100 through a wireless charging technology. - The
portable terminal 100 may include at least onetouch screen 190 for providing graphical user interfaces corresponding to any of various services (for example, voice communication, data transmission, listening to or viewing broadcasts, and photographing) to the user. - The
touch screen 190 may output an analog signal corresponding to at least one user input applied to a graphical user interface displayed on thetouch screen 190 and accepted by thetouch screen controller 195. - The
touch screen 190 may receive at least one user input applied by a human body (for example, a finger including a thumb) of the user, or applied by the input unit 168 (for example, a stylus pen or an electric pen). - The
touch screen 190 may receive a continuous movement (that is, a drag input) of a single touch. Thetouch screen 190 may output an analog signal corresponding to a continuous movement of an input touch to thetouch screen controller 195. - As discussed previously, the
touch screen 190 may accept user input in the form of a contact of thetouch screen 190 with a finger or theinput unit 168. Alternatively or additionally, thetouch screen 190 may accept user input in the form of a noncontact method (for example, the case of locating an applied user input unit within a specified minimum distance (for example, 1 cm) from thetouch screen 190 by which the user input unit can be detected without any direct contact with the touch screen 190). The distance or interval by which the user input unit is recognized by thetouch screen 190 may be selected, adjusted, or changed according to a desired performance parameter or structure of theportable terminal 100. In particular, thetouch screen 190 may be configured such that values (for example, voltage values or current values which are analog values) detected by a direct touch event by a contact with theuser input unit 168, and values detected an indirect touch event (that is, a hovering event) may be output differently or output in such a way so that the direct touch event and the indirect touch event may be distinguished from one another based upon the detected values. - The
touch screen 190 may be realized, for example, using a resistive method, a capacitive method, an infrared method, an acoustic wave method, or any of various combinations thereof. - The
touch screen 190 may include at least two touch screen panels by which a finger input and a stylus input can be detected, respectively, such that a first input applied by a portion of a human body such as a finger and a second input applied by a stylus such as theinput unit 168 may be detected. The at least two touch screen panels may provide a plurality of different sensed output values to thetouch screen controller 195. For example, thetouch screen controller 195 may use the sensed output values received from the at least two touch screen panels in order to determine whether thetouch screen 190 has accepted an input that was applied by a finger, versus an input that was applied by theinput unit 168. Alternatively or additionally, thetouch screen 190 may have a structure in which a capacitive touch screen panel and an Electromagnetic Resonance (EMR) type touch panel are combined. Since thetouch screen 190 may include touch keys such as amenu button 161 b (FIG. 2 ) and aback button 161 c, a finger input applied to thetouch screen 190 includes a touch input on the touch key. - The
touch screen controller 195 converts an analog signal generated by thetouch screen 190 in response to an accepted input into a digital signal and transmits the digital signal to thecontroller 110. Thecontroller 110 may control thetouch screen 190 by using a digital signal received from thetouch screen controller 195. For example, thecontroller 110 may allow a shortcut icon (not shown) or an object displayed on thetouch screen 190 to be selected or executed directly in response to a touch event or a hovering event. Further, thetouch screen controller 195 may be integrated with thecontroller 110. - The
touch screen controller 195 may detect or sense a value (for example, a current value) output through thetouch screen 190 to identify a hovering interval or distance as well as an input location of the user, and may convert the identified distance value into a digital signal (for example, a Z coordinate) to provide the digital value to thecontroller 110. Further, thetouch screen controller 195 may detect or sense a value (for example, a current value) output through thetouch screen 190 so that theuser input unit 168 can detect a pressure applied to thetouch screen 190, and may convert the sensed pressure value into a digital signal to provide the digital signal to thecontroller 110. -
FIG. 2 is a front perspective view showing the portable terminal according to a set of exemplary embodiments of the present invention.FIG. 3 is a rear perspective view showing the portable terminal according to a set of exemplary embodiments of the present invention. - Referring to
FIGS. 2 and 3 , thetouch screen 190 is disposed at a center of afront surface 101 of theportable terminal 100. Thetouch screen 190 may, but need not, be formed to occupy almost the entire area of thefront surface 101 of theportable terminal 100.FIG. 2 shows that a main home screen is displayed on thetouch screen 190. The main home screen may be the first screen displayed on thetouch screen 190 when the power of theportable terminal 100 is switched on. Further, when theportable terminal 100 has different home screens of several pages, the main home screen may be the first home screen of the home screens of several pages. Shortcut icons 191-1, 191-2, and 191-3 are used for executing frequently used applications. A main menu switching key 191-4 is provided. A current time, and current weather conditions may be displayed on the home screen. If a user selects the main menu switching key 191-4, a menu screen is displayed on thetouch screen 190. Further, astatus bar 192 for displaying statuses of theportable terminal 100 such as a battery charging state, an intensity of a received signal, and a current time may be formed, for example, at an upper end of thetouch screen 190. - Touch keys such as a
home button 161 a, amenu button 161 b, and aback button 161 c, mechanical buttons or a combination thereof may be formed below thetouch screen 190. Further, the touch keys may be formed as parts of thetouch screen 190. - The
home button 161 a may be used to display the main home screen on thetouch screen 190. For example, If thehome button 161 a is selected while another home screen or menu screen different from the main home screen is displayed on thetouch screen 190, the main home screen may be displayed on thetouch screen 190. If thehome button 161 a is selected while one or more applications are being executed on thetouch screen 190, the main home screen shown inFIG. 2 may be displayed on thetouch screen 190. Thehome button 161 a may be used to display recently used applications on thetouch screen 190 or display a task manager. - The
menu button 161 b provides a connection menu that can be displayed on thetouch screen 190. For purposes of illustration, the connection menu may include any of a widget adding menu, a background changing menu, a search menu, an edition menu, and an environment setting menu. - The
back button 161 c may be used to display a screen executed shortly before the currently executed screen, or may be used to end the most currently used application. - The
first camera 151, theluminance sensor 170 a, and theproximity sensor 170 b may be disposed at a periphery of thefront surface 101 of theportable terminal 100. Thesecond camera 152, theflash 153, and thespeaker 163 may be disposed on therear surface 103 of theportable terminal 100. - For example, a power/
lock button 161 d, avolume button 161 e having a volume upbutton 161 f and a volume downbutton 161 g, a terrestrial Advanced Television Systems Committee—Mobile/Handheld (ATSC-M/H)antenna 141 a for receiving broadcasts, and one or a plurality ofmicrophones 162 may be disposed on a side surface of theportable terminal 100. The ATSC-M/H antenna 141 a may be fixed to or detachably mounted to theportable terminal 100. Aconnector 165 may be formed, for example, on a side surface of a lower end of theportable terminal 100. Theconnector 165 may have a plurality of electrodes and may be connected to an external device. Anearphone connection jack 167 may be formed on a side surface of an upper end of theportable terminal 100. An earphone may be inserted into theearphone connection jack 167. - An
input unit 168 may be mounted to a side surface of a lower end of theportable terminal 100. Theinput unit 168 may be inserted into and kept in theportable terminal 100 while theinput unit 168 is not in use. Theinput unit 168 may be extracted and separated from theportable terminal 100 during use of theportable terminal 100. -
FIG. 4 is an exploded perspective view showing a main configuration of a touch screen. As shown, thetouch screen 190 has a configuration in which atouch screen 210 for detecting a finger input, adisplay unit 220 for displaying a screen, and adigitizer 230 for detecting a pen input are attached to each other or are sequentially laminated to be partially spaced apart from each other from top to bottom. Thetouch panel 210 and thedigitizer 230 may be referred to as a first and a second touch panel, respectively. - The
display unit 220 includes a plurality of pixels and displays an image through the pixels. Thedisplay unit 220 may include one or more of a Liquid Crystal Display (LCD), an Organic Light Emitting Diode (OLED), or an LED. - The
touch panel 210 includes awindow 211 exposed to a front surface of theportable terminal 100, and asecond sensor layer 212 for recognizing information (a location or an intensity) of a finger input. Thesecond sensor layer 212 may be laminated on the window while being laminated on a separate substrate or may be directly laminated on thewindow 211. Thetouch panel 210 may be configured to provide touch keys such as amenu button 161 b and aback button 161 c disposed below a screen exposed to the user. - The upper surface of the
window 211 forms at least a portion of the front surface of thetouch screen 190 exposed to the outside. Thewindow 211 may be formed of an insulating material which is substantially transparent to visible rays. An example of the insulating material may include a synthetic resin such as polyimide and polyethylene terephthalate or plastic. - A hard coating layer having a high hardness for preventing a scratch may be laminated on an upper surface of the
window 211. The hard coating layer may, but need not, have both a hardness improving function and a glare preventing function. For example, the hard coating layer may be formed of a material obtained by adding a light scattering agent to a general hard coating agent. - The
second sensor layer 212 includes a sensor for recognizing a location of a first input if a portion of a human body such as a finger contacts a surface of the window 211 (FIG. 4 ), and thesecond sensor layer 212 has preset patterns for this. Thesecond sensor layer 212 may have various patterns such as a linear grid pattern or a diamond pattern, for example. Thesecond sensor layer 212 may be laminated on a lower surface of thewindow 211, or a lower end (lower surface) of thesecond sensor layer 212 may be attached to an upper end (or upper surface) of thedisplay unit 220 by using a transparent adhesive member. -
FIG. 5 is a plan view and a corresponding cross-sectional view illustrating a pattern of the second sensor layer. Thesecond sensor layer 212 includesfirst electrode lines 310 and second electrode lines 320. The cross-sectional view displayed at a lower portion ofFIG. 5 shows continuously disposedfirst electrode lines 310 TX1, TX2, ad TX3, and asecond electrode line 320 RX. - The
first electrode lines 310 extend along a first direction (for example, the x-axis or horizontal direction) and are disposed at the same interval or different intervals in a second direction (for example, the y-axis or vertical direction) crossing the first direction perpendicularly to the first direction. - The
second electrode lines 320 extend along the second direction crossing the first direction perpendicularly to the first direction, and are disposed at the same interval or different intervals along the first direction. - In order to electrically insulate the
first electrode lines 310 from thesecond electrode lines 320, an insulatinglayer 330 is disposed between thefirst electrode lines 310 and the second electrode lines 320. A suitable material for the insulatinglayer 330 may include, for example, an insulating dielectric material such as SiO2. - The
second sensor layer 212 may be formed of a conductive material which is substantially transparent to visible rays of light. An example of a suitable conductive material may include a carbon containing organic material such as Carbon Nano Tube (CNT) or graphene. - In order to perform a sensing function, a scan signal having a predetermined waveform is applied to the
second sensor layer 212. If a portion of a human body such as a finger contacts a surface of thewindow 211, a detection signal whose waveform is changed due to an electrostatic capacity between thesecond sensor layer 212 and the portion of the human body is generated. Thecontroller 110 analyzes the detection signal to recognize a contact and a contact location of the portion of the human body. For example, if the portion of the human body contacts the touch screen 190 (FIG. 2 ), an electrostatic capacity of a corresponding sensing point 340 (FIG. 5 ) increases. Thecontroller 110 detects generation of a finger touch event based on a detection signal having a peak value above a threshold value (or a minimum value below a threshold value), or detects a finger input location. The threshold value may be empirically set as a value for distinguishing noise from a normal signal, and for example, may be set to a voltage of above 0 V or an electric capacity of above 0 pf. Meanwhile, a finger is an example of the portion of the human body, and any unit that can provide an electrostatic capacity between thesecond sensor layer 212 and the unit may be used. - In order to perform a sensor function, voltages (that is, scan signals) having predetermined waveforms are sequentially applied from the touch screen controller 195 (
FIG. 1 ) to the first electrode lines 310 (FIG. 5 ), and thesecond electrode lines 320 outputs detection signals due to the scan signals to thetouch screen controller 195. Points where the first andsecond electrode lines FIG. 5 . That is, a finger input location is determined by one of the locations of the sensing points 340. If the portion of the human body contacts a surface of thewindow 211, an entire electrostatic capacity of acorresponding sensing point 340 varies due to an electrostatic capacity between thesecond sensor layer 212 and the portion of the human body. Voltage waveforms of the detection signals output from thesecond electrode lines 320 vary due to the change in the electrostatic capacity. An input location and/or an input intensity of a finger input are recognized from the detection signals whose voltage waveforms have been modified by the applied finger input. -
FIG. 6 is a perspective view illustrating the operation of the digitizer that was previously described in conjunction withFIG. 4 . - The
digitizer 230 may be an Electromagnetic (EM) touch panel, and includes afirst sensor layer 410, a magneticfield shielding layer 420, and aconductive layer 430. Themain board 440 disposed below thedigitizer 230 may be a printed circuit board in which various circuits such as thecontroller 110, thecommunication module 120, themultimedia module 140, the input/output module 160, thesensor module 170, thestorage unit 175, and thepower supply 180 are mounted or connected to an upper surface or a lower surface thereof. - The
first sensor layer 410 includes first andsecond loop parts touch screen controller 195, Thefirst sensor layer 410 outputs detected signals to thetouch screen controller 195. Thefirst loop part 510 includes a plurality offirst loops 511 and thesecond loop part 520 includes a plurality ofsecond loops 521. - A magnetic field or
electromagnetic signal 404 emitted by theinput unit 168 may be absorbed by theloops digitizer 230 in closest proximity to theinput unit 168 may be identified. - Further, the
loops input unit 168. Theinput unit 168 may emit the absorbed magnetic fields again, and the magnetic fields emitted from theinput unit 168 may be absorbed by theloops - The
first loop part 510 and thesecond loop part 520 may be disposed perpendicular to each other. - The
first loop part 510 extends relatively long in the y-axis direction rather than in the x-axis direction, and accordingly is used to detect an x-axis coordinate of a pen input location. - The
second loop part 520 extends relatively long in the x-axis direction rather than in the y-axis direction, and accordingly is used to detect a y-axis coordinate of a pen input location. - The first and
second loops electromagnetic signal 404 having a predetermined frequency output from theinput unit 168 in the form of an electrical signal. The first andsecond loops electromagnetic signal 404 to thetouch screen controller 195. - The
input unit 168, when placed in proximity to thedigitizer 230, generates an electromagnetic signal according to an operation of aresonant circuit 401 including acoil 402 and acapacitor 403, and outputs the electromagnetic signal. - The
input unit 168 is one illustrative embodiment, as any unit capable of outputting an electromagnetic signal may be used. - The
conductive layer 430 prevents thefirst sensor layer 410 and a circuit or a peripheral circuit of themain board 440 from interfering with each other due to stray magnetic fields, and is laminated on a lower surface of the electromagneticfield shielding layer 420. Theconductive layer 430 may be laminated on an entire lower surface and an entire or portion of side surface of thedigitizer 230. Then, theconductive layer 430 may surround at least an entire side surface of thefirst sensor layer 410. That is, theconductive layer 430 may have a box structure having an opened upper end like a general bracket. Theconductive layer 430 prevents a magnetic field generated in a circuit or a peripheral circuit of themain board 440 from reaching thefirst sensor layer 410. -
FIGS. 7 and 8 are views that illustrate the basic principles of magnetic field shielding. - Referring to
FIG. 7 , acoil 620 connected to anAC power source 610 generates a firstmagnetic field 630. - If a magnetic field is applied to the
conductive layer 640, aneddy current 650 is generated. Theeddy current 650 generates a secondmagnetic field 660 in an opposite direction to the applied firstmagnetic field 630, and accordingly, an intensity of the firstmagnetic field 630 is reduced by an offset interference by the secondmagnetic field 660. - For this reason, if an intensity of the magnetic field applied to the
digitizer 230 is reduced, a maximum distance by which thedigitizer 230 recognizes an input unit becomes shorter, which increases the possibility that thedigitizer 230 will malfunction or not operate properly. - Referring to
FIG. 8 , the magneticfield shielding layer 420 is disposed between thefirst sensor layer 410 and theconductive layer 430. Almost all of the firstmagnetic field 404 having passed through thefirst sensor layer 410 flows through the magneticfield shielding layer 420 to significantly reduce an intensity of a residualmagnetic field 405 having passed through the magneticfield shielding layer 420 and having reached theconductive layer 430. Thus, an intensity of the secondmagnetic field 406 generated by the residualmagnetic field 405 is also significantly reduced. In this case, since the firstmagnetic field 405 fails to reach theconductive layer 430, an eddy current is not generated in theconductive layer 430, and the first magnetic field remains intact. - Unlike this example, the
conductive layer 430 may be omitted, in which case since an offset interference may be generated by the eddy current due to a conductive element located around thedigitizer 230, the magneticfield shielding layer 420 is used to restrain the offset interference. -
FIG. 9 is a flowchart showing a method of manufacturing a digitizer according to a first set of embodiments of the present invention, andFIG. 10 is a view for explaining the method of manufacturing a digitizer. - The method of manufacturing a digitizer includes steps S10 to S20.
FIG. 10A shows an arrangement of layers which correspond to step S10 ofFIG. 9 , andFIG. 10B shows this arrangement of layers upon performance of step S20 ofFIG. 9 . - Step S110 is a step of temporarily bonding first and second cover layers 20 and 30 to a
circuit layer 10. The first and second cover layers 20 and 30 are temporarily bonded to thecircuit layer 10 by using first and secondadhesive layers circuit layer 10 before hot pressing. Thecircuit layer 10 includes an insulatinglayer 12. First and secondconductive circuits layer 12, constituteloop parts 510, 520 (FIG. 6 ). The first andsecond circuits 11 and 13 (FIGS. 10A and 10B ) have preset conductive circuit patterns, respectively. Further, in the illustrated layered structure, any of the adjacent layers may be expressed to be laminated on or attached to each other. - The
circuit layer 10 may be formed by preparing a Copper Clad Laminate (CCL) including an insulatinglayer 12 of a Polyimide (PI) material, a first conductive layer of a copper material laminated on a first surface of the insulatinglayer 12, and a second conductive layer of a copper material laminated on a second surface of the insulating layer located on an opposite side of the first surface, and etching the first and second conductive layers by conventional photolithography such that the first and second conductive layers have patterns of theloop parts 510, 520 (FIG. 6 ). The photo-etched first and second conductive layers form first andsecond circuits 11 and 13 (FIGS. 10A and 10B ). - The
first cover layer 20 may be formed of a polyimide material, and may be bonded to a surface of thefirst circuit 11 by using a firstadhesive layer 40 such as a pressure sensitive adhesive or a thermosetting adhesive. - The
second cover layer 30 may be formed of a polyimide material, and may be bonded to a surface of thesecond circuit 13 by using a secondadhesive layer 41 such as a PSA or a thermosetting adhesive. - The magnetic
field shielding layer 420 a may be coated on a surface of thesecond cover layer 30. - The magnetic
field shielding layer 420 a may have a structure in whichmagnetic powder 422 in the form of thin plate-shaped flakes is dispersed disorderly (or at random) in an insulating and/oradhesive resin 421. That is, the magneticfield shielding layer 420 a may contain disorientedmagnetic powder 422. - For example, the magnetic
field shielding layer 420 a may be formed by transforming magnetic powder such as one or more of a ferrite, Molypermalloy Powder (MPP), an Fe—Si—Al series material (Sandust), or an Ni—Fe series material (Highflux) into flakes, adding and dispersing the transformedmagnetic powder 422 into an insulating and/or adhesive resin (or adhesive) 421, and coating theresin 421 in which themagnetic powder 422 is dispersed on a surface of thesecond cover layer 30. Theresin 421 in which themagnetic powder 422 is coated on thesecond cover layer 30 forms the magneticfield shielding layer 420 a. - Step S20 is a step of hot pressing the
circuit layer 10 and the first and second cover layers 20 and 30. Thecircuit layer 10 and the first and second cover layers 20 and 30 may be hot pressed by using a hot press apparatus. The hot pressing refers to applying a pressure at a high temperature, for example, a temperature in the approximate range of 120 to 280° C. - The thicknesses of the magnetic
field shielding layer 420 a and theadhesive layers magnetic powder 422 that was dispersed disorderly or randomly is now arranged (that is, oriented) in a predetermined direction in the magneticfield shielding layer 420 through the hot pressing process. The magnetic field shielding characteristics of the oriented magneticfield shielding layer 420 are significantly improved relative to the randomly or disorderly orientation of themagnetic powder 422. The magneticfield shielding layer 420 having undergone the hot pressing process may have a permeability of 100 H/m to 200 H/m in a DC band, and may have a permeability of 100 H/m to 150 H/m in a band of 500 KHz (531.25 KHz, 562.5 KHz, and 593.75 KHz). The magneticfield shielding layer 420 passes a geomagnetic field therethrough and does not influence an operation of a geomagnetic sensor. For example, the magneticfield shielding layer 420 may have a thickness of 50 μm to 100 μm. - The
circuit layer 10 and the first and second cover layers 20 and 30 may constitute thefirst sensor layer 410. -
FIG. 11 is a flowchart showing a method of manufacturing a digitizer according to a second set of embodiments of the present invention.FIGS. 12 to 14 are views for explaining the method of manufacturing a digitizer according to the second set of embodiments of the present invention. - The method of manufacturing a digitizer includes steps S110 to S130.
- Step S110 is a step of forming a
circuit layer 710. Thecircuit layer 710 including first andsecond circuits first cover layer 720 laminated on a first surface of thecircuit layer 710, are formed. Hereinafter, first and second surfaces of the layers are located on opposite sides of the layers. Thecircuit layer 710 has preset conductive circuit patterns such asloop parts 510, 520 (FIG. 6 ). In the layered structure ofFIGS. 12A and 12B , adjacent layers may be expressed to be directly laminated on or attached to each other. - Referring to
FIG. 12A , thecircuit layer 710 includes an insulatinglayer 712, a conductivefirst circuit 711 laminated on a first surface of the insulatinglayer 712, and a conductivesecond circuit 713 laminated on a second surface of the insulatinglayer 712 located on an opposite side of the first surface. - Referring to
FIG. 12B , an insulatingfirst cover layer 720 may be laminated on a surface of thefirst circuit 711. - For example, the
first circuit 711 and thefirst cover layer 720 may be attached to each other by disposing an adhesive layer such as one or more of a Pressure Sensitive Adhesive (PSA), an adhesive sheet, a bonding sheet, or a thermosetting adhesive between thefirst circuit 711 and thefirst cover layer 720 of a polyimide material, and pressing thefirst circuit 711 and thefirst cover layer 720. Thefirst circuit 711 and thefirst cover layer 720 may be hot pressed by using the PSA or the thermosetting adhesive and a hot press apparatus. Thefirst circuit 711 and thefirst cover layer 720 may be attached to each other through a UV-curable adhesive irradiated with UV rays. - Step 120 is a step of forming a magnetic
field shielding layer 420 a and aconductive layer 430. The magneticfield shielding layer 420 a is laminated on a second surface of an insulatingsecond cover layer 730 and aconductive layer 430 is laminated on a surface of the magneticfield shielding layer 420 a. - Referring to
FIG. 13A , the magneticfield shielding layer 420 a has a structure in whichmagnetic powder 422 in the form of thin plate-shaped flakes is dispersed disorderly (or at random) in an insulating and/oradhesive resin 421. That is, the magneticfield shielding layer 420 a contains disorientedmagnetic powder 422. - Referring to
FIG. 13B , while the magneticfield shielding layer 420 a is not dried, an aluminum or magnesiumconductive layer 430 in the form of a film is attached to a surface of the magneticfield shielding layer 420 a. - Note that, in contrast to the example of
FIG. 13B , theconductive layer 430 may, but need not, be attached to a surface of the magneticfield shielding layer 420 a by using an adhesive. Then, theconductive layer 430 may be attached to a surface of the magneticfield shielding layer 420 a by using an adhesive such as a PSA or a thermosetting adhesive so that theconductive layer 430 may be hot pressed during the hot pressing of the magneticfield shielding layer 420 a. - Step S130 is a step of attaching the magnetic
field shielding layer 420 a and thecircuit layer 710. The magneticfield shielding layer 420 a and thecircuit layer 710 may be hot pressed by using the PSA or the thermosetting adhesive and a hot press apparatus. - Referring to
FIG. 14A , the magneticfield shielding layer 420 a and thecircuit layer 710 may be arranged while theadhesive layer 740 such as a PSA or a thermosetting adhesive is interposed therebetween. That is, a second surface of thesecond circuit 713 and a first surface of thesecond cover layer 730 are temporarily attached by using theadhesive layer 740. - Referring to
FIGS. 14A and 14B , the magneticfield shielding layer 420 a and thecircuit layer 710 are hot pressed by using a hot press apparatus. The thicknesses of the magneticfield shielding layer 420 a and thebonding layer 740 are reduced through the hot pressing process. Prior to performance of the hot pressing process, themagnetic powder 422 has a randomly or disorderly dispersed magnetic orientation. The thermal pressing process arranges or orients themagnetic powder 422 in a predetermined direction in the magneticfield shielding layer 420. - The first and second cover layers 720 and 730, the first and
second circuits layer 712 may constitute thefirst sensor layer 410. - In contrast to the example of
FIGS. 14A and 14B , after the magneticfield shielding layer 420 is hot pressed, theconductive layer 430 may be attached to the magneticfield shielding layer 420 by using an adhesive. Theconductive layer 430 may be coated on the magneticfield shielding layer 420 through a deposition process. - The present invention provides a digitizer which reduces or eliminates interference caused by stray electromagnetic fields from external circuit components or conductors. The digitizer has a thin structure, and is simple to manufacture.
- In more detail, according to a set of illustrative embodiments of the present invention, the need to perform a separate process or a special step of orienting magnetic powder may be eliminated. The magnetic powder is automatically oriented when a magnetic field shielding layer and a circuit layer are hot pressed. A separate cutting and attaching process for a cover layer and the magnetic field shielding layer can be excluded. In addition, a digitizer manufacturing process may be automated and simplified. The digitizer may be designed to have a thin structure, low cost, and high performance by directly coating the magnetic field shielding layer on the cover layer and excluding a separate bonding film for attachment of the magnetic field shielding layer.
- Although the exemplary embodiments of the present invention have been described in detail with reference to specific examples, various modification can be made without departing from the scope of the present invention. Thus, the scope of the present invention is not determined by the above-described embodiments and should be determined by the claims and their equivalents.
Claims (20)
1. A method of manufacturing a digitizer, the method comprising:
forming a circuit layer configured for sensing or detecting an input;
forming a magnetic field shielding layer that includes disoriented magnetic powder;
disposing an adhesive between the circuit layer and the magnetic field shielding layer; and
hot pressing the circuit layer and the magnetic field shielding layer so as to orient the magnetic powder.
2. The method of claim 1 , wherein the forming of the circuit layer further comprises:
providing a Copper Clad Laminate (CCL) comprising an insulating layer, a first conductive layer, and a second conductive layer; and
etching the first and second conductive layers to form first and second circuits, respectively.
3. The method of claim 2 , further comprising forming a cover layer on a surface of the first circuit.
4. The method of claim 1 , wherein the forming of the magnetic field shielding layer further comprises:
dispersing magnetic powder in a resin; and
coating the resin in which the magnetic powder is dispersed on a surface of a cover layer disposed between the circuit layer and the magnetic field shielding layer.
5. The method of claim 4 , wherein the forming of the magnetic field shielding layer further comprises transforming the magnetic powder into flakes, and wherein the transformed magnetic powder is dispersed in the resin.
6. The method of claim 1 , further comprising attaching a conductive layer to a surface of the magnetic field shielding layer.
7. The method of claim 6 , wherein the conductive layer is attached to the magnetic field shielding layer by using an adhesive.
8. The method of claim 1 , further comprising:
disposing a cover layer between the circuit layer and the magnetic field shielding layer; and
using the adhesive to attach the cover layer and the circuit layer to each other.
9. The method of claim 1 , wherein the adhesive is a pressure sensitive adhesive or a thermosetting adhesive.
10. A digitizer manufactured using the method of claim 1 .
11. A digitizer comprising:
a circuit layer that detects or senses an input;
a magnetic field shielding layer disposed on the circuit layer and including magnetic powder having an oriented magnetic field; and
a conductive layer disposed on the magnetic field shielding layer.
12. The digitizer of claim 11 , wherein the circuit layer further comprises:
an insulating layer; and
first and second circuit patterns disposed on opposite sides of the insulating layer.
13. The digitizer of claim 11 , further comprising first and second cover layers disposed on opposite sides of the circuit layer.
14. The digitizer of claim 12 , wherein the circuit layer further comprises:
a Copper Clad Laminate (CCL) comprising an insulating layer, a first conductive layer, and a conductive insulating layer; and the first and second conductive layers are etched to form the first and second circuit patterns.
15. The digitizer of claim 11 , wherein the magnetic field shielding layer is fabricated by dispersing a disoriented magnetic powder in a resin; and coating the resin in which the magnetic powder is dispersed on a surface of a cover layer disposed between the circuit layer and the magnetic field shielding layer.
16. The digitizer of claim 15 , wherein the magnetic field shielding layer is fabricated by transforming the disoriented magnetic powder into flakes, such that the transformed disoriented magnetic powder is dispersed in the resin.
17. The digitizer of claim 11 , wherein the conductive layer is attached to the magnetic field shielding layer by an adhesive.
18. The digitizer of claim 13 , wherein an adhesive is used to attach the second cover layer and the circuit layer to each other.
19. The digitizer of claim 17 , wherein the adhesive is a pressure sensitive adhesive or a thermosetting adhesive.
20. The digitizer of claim 18 , wherein the adhesive is a pressure sensitive adhesive or a thermosetting adhesive.
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KR1020130027342A KR102027246B1 (en) | 2013-03-14 | 2013-03-14 | Digitizer and method for fabricating the same |
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US10761671B2 (en) | 2020-09-01 |
KR102027246B1 (en) | 2019-10-01 |
US20190204962A1 (en) | 2019-07-04 |
KR20140112800A (en) | 2014-09-24 |
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