Touch device including flexible printed circuit board and touch system including the same

Abstract

A touch device according to the present disclosure comprises a flexible circuit board, a touch panel located on the flexible circuit board, a first metal sheet located between the touch panel and the flexible circuit board, and a first shielding sheet located between the touch panel and the first metal sheet.

Description

Technology Field

[0001] The present disclosure relates to a touch device comprising a flexible circuit board and a touch system comprising the same. Background Technology

[0002] Various electronic devices such as mobile phones, smartphones, laptop computers, digital broadcasting terminals, PDAs (personal digital assistants), PMPs (portable multimedia players), navigation systems, slate PCs, tablet PCs, ultrabooks, and wearable devices are equipped with touch sensors.

[0003] Within such electronic devices, touch sensors may be located on a display panel that displays images or on a part of the electronic device. By allowing a user to interact with the electronic device by touching the touch sensor, the electronic device can provide the user with an intuitive user interface.

[0004] Users can use a stylus pen for precise touch input. Stylus pens can be classified into active and passive stylus pens depending on whether they are equipped with an internal battery and electronic components.

[0005] Active stylus pens have the advantage of superior basic performance and the ability to provide additional functions (pressure sensitivity, hovering, buttons) compared to passive stylus pens, but they have the disadvantage of being difficult to use while charging the battery.

[0006] Passive stylus pens have the advantage of being cheaper and not requiring batteries compared to active stylus pens, but they have the disadvantage of being difficult to achieve precise touch recognition.

[0007] In particular, among passive stylus pens, in the case of EMR (Electro-Magnetic Resonance) type pens, the digitizer transmits an electromagnetic signal to the pen, and then the digitizer receives a resonance signal from the pen. In such digitizers, coils capable of inducing current by magnetic signals are densely arranged to receive touch information from the pen. These digitizers have the problem of not being able to respond to the miniaturization and thinning of electronic devices, nor can they be designed flexibly. The problem to be solved

[0008] The embodiments are for a touch device capable of enhancing the magnitude of the electromagnetic signal provided to a stylus pen. means of solving the problem

[0009] A touch device according to one embodiment includes a flexible circuit board, a touch panel located on the flexible circuit board, a first metal sheet located between the touch panel and the flexible circuit board, and a first shielding sheet located between the touch panel and the first metal sheet.

[0010] A touch system according to one embodiment includes a touch device comprising a touch panel and a stylus pen that resonates based on a signal received from the touch device. The touch device comprises a flexible circuit board, a touch panel located on the flexible circuit board, a first metal sheet located between the touch panel and the flexible circuit board, a first shielding sheet located between the touch panel and the first metal sheet, and a second metal sheet located below the flexible circuit board. Effects of the invention

[0011] According to embodiments, a touch device capable of increasing the magnitude of an electromagnetic signal provided to a stylus pen is provided. Brief explanation of the drawing

[0012] FIG. 1 is a drawing for explaining a stylus pen and an electronic device according to one embodiment. FIG. 2 is a drawing for explaining a stylus pen according to one embodiment. FIG. 3 is a drawing for explaining an electronic device according to one embodiment. FIG. 4 is a drawing for explaining a touch device according to one embodiment. FIG. 5 is a diagram illustrating signal transmission between a stylus pen and an electronic device according to one embodiment. FIG. 6 is a diagram illustrating the direction of a magnetic field generated by a touch panel, a display panel, and a flexible circuit board according to one embodiment. FIG. 7 is a drawing for explaining a touch device including a shielding sheet and a metal sheet according to one embodiment. FIG. 8 is a drawing for explaining a touch device including a metal sheet located on the lower part of a flexible circuit board according to one embodiment. FIG. 9 is a drawing for explaining a touch device including a shielding sheet located on the lower part of a flexible circuit board according to one embodiment. FIG. 10 is a drawing for explaining a touch device including a metal sheet positioned on a flexible circuit board according to one embodiment. FIG. 11 is a drawing for explaining a touch device including a shielding sheet located on a flexible circuit board according to one embodiment. FIG. 12 is a drawing for illustrating another example of a touch device including a shielding sheet and a metal sheet according to one embodiment. FIG. 13 is a drawing for illustrating a flexible circuit board including a ground shielding layer and a line pattern layer according to one embodiment. FIG. 14 is a drawing for illustrating a touch device in which the length of a line pattern layer according to one embodiment is shorter than a preset length. FIG. 15 is a drawing for illustrating another example of a touch device in which the length of a line pattern layer according to one embodiment is shorter than a preset length. Specific details for implementing the invention

[0013] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0014] To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0015] Furthermore, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, and thus the present invention is not necessarily limited to what is illustrated. Thicknesses have been enlarged in the drawings to clearly represent various layers and regions. Additionally, for convenience of explanation, the thickness of some layers and regions has been exaggerated in the drawings.

[0016] Furthermore, when it is said that a part, such as a layer, membrane, region, or plate, is "on" or "on" another part, this includes not only the case where it is "directly above" the other part, but also the case where there is another part in between. Conversely, when it is said that a part is "directly above" another part, it means that there is no other part in between. Also, saying that a part is "on" or "on" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "on" or "on" in the direction opposite to gravity.

[0017] Furthermore, throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0018] Additionally, throughout the specification, "planar" means when the subject part is viewed from above, and "cross-sectional" means when the cross-section obtained by vertically cutting the subject part is viewed from the side.

[0019] An electronic device according to various embodiments of the present disclosure may include, for example, at least one of a smartphone, a tablet PC (tablet personal computer), a mobile phone, a video phone, an e-book reader, a laptop PC (laptop personal computer), a netbook computer, a mobile medical device, a camera, or a wearable device. According to various embodiments, the wearable device may include at least one of an accessory type (e.g., a watch, ring, bracelet, anklet, necklace, glasses, contact lens, or head-mounted device (HMD)), a fabric or clothing integrated type (e.g., electronic clothing), a body-attached type (e.g., a skin pad or tattoo), or a bio-implantable type (e.g., an implantable circuit).

[0020] Hereinafter, a touch device according to embodiments and a touch system including the same will be described with reference to the necessary drawings.

[0022] FIG. 1 is a drawing for explaining a stylus pen and an electronic device according to one embodiment.

[0023] Referring to FIG. 1, the stylus pen (10) can receive a first electromagnetic signal generated by the electronic device (2) and transmit a second electromagnetic signal to the touch screen (20).

[0024] The stylus pen (10) can be classified into an active stylus pen and a passive stylus pen depending on whether it is equipped with a battery and electronic components inside. For example, in the case of an EMR (Electro-Magnetic Resonance) type among passive stylus pens, after the digitizer on the touch screen (20) transmits an electromagnetic signal to the pen, the digitizer can receive a resonance signal from the pen and detect the touch position of the stylus pen.

[0025] According to one embodiment, the stylus pen (10) may be a pen using an EMR method, but is not limited thereto, and may include various types of stylus pens that resonate with a first electromagnetic signal generated by the touch screen (20) and transmit a second electromagnetic signal to the touch screen (20).

[0026] The electronic device (2) may include at least one of a portable communication device (e.g., smartphone, tablet PC), a computer device, a portable multimedia device, a portable medical device, a wearable device, or a home appliance. Additionally, the electronic device (2) may be a flexible device or a flexible display device.

[0027] The electronic device (2) may include a touch screen (20). The touch screen (20) may generate a first electromagnetic signal to drive a stylus pen (10) and detect a second electromagnetic signal generated by the stylus pen (10). The touch screen (20) may detect the touch position of the stylus pen (10) based on the second electromagnetic signal.

[0029] FIG. 2 is a drawing for explaining a stylus pen according to one embodiment.

[0030] The stylus pens (10a, 10b) of FIG. 2 may commonly include a resonant circuit (12) within the housing.

[0031] The resonant circuit section (12) is an LC resonant circuit and can resonate with a driving signal output from a touch screen (20). The driving signal may include a signal having a frequency corresponding to the resonant frequency of the resonant circuit section (12) (e.g., a sine wave, a square wave, etc.). For resonance, the resonant frequency of the resonant circuit section (12) and the frequency of the driving signal may be the same or very similar. The resonant frequency of the stylus pen (10a, 10b) may be based on the design value of the resonant circuit section (12) of the stylus pen (10a, 10b).

[0032] The elements of the stylus pen (10a, 10b) can be accommodated in a housing. The housing may have a cylinder, a polygonal prism, a column shape with at least a part of a curved surface, an entasis shape, a frustum of pyramid shape, a circular truncated cone shape, etc., but is not limited to such shapes. Since the housing is hollow inside, it can accommodate elements of the stylus pen (10a, 10b), such as a resonant circuit part (12), inside. Such a housing may be made of a non-conductive material.

[0033] Referring to FIG. 2(a), an EMR type stylus pen (10a) may include a core (11a) and a resonant circuit (12). The resonant circuit (12) may include an inductor section (14) and a capacitor section (13). The inductor section (14) may include a ferrite core (115) through which the core (11a) passes and a coil (116) wound on the outer surface of the ferrite core (115).

[0034] One end of the core (11a) may protrude from the ferrite core (115) as a pen tip. The core (11a) may be composed of an electrode core made of a conductor, for example, a hard resin mixed with a conductive metal or conductive powder.

[0035] In the ferrite core (115), for example, a cylindrical ferrite material may have an axial through hole of a predetermined diameter (e.g., 1 mm) formed therein for inserting and passing a core body (11a).

[0036] The coil (116) may be wound along the entire length in the axial direction of the ferrite core (115) or along a portion of its length. The coil (116) may be electrically connected to the capacitor section (13).

[0037] The capacitor section (13) may include a plurality of capacitors connected in parallel. Each capacitor on the printed circuit board may have a different capacitance and may be trimmed during the manufacturing process.

[0038] Referring to FIG. 2(b), an ECR (Electrically Coupled Resonance) type stylus pen (10b) may include a conductive tip (11b) and a resonance circuit part (12). The resonance circuit part (12) may include an inductor part (14) and a capacitor part (13). The inductor part (14) may include a ferrite core (115) and a coil (116) wound on the outer surface of the ferrite core (115).

[0039] The conductive tip (11b) may be formed, at least in part, of a conductive material (e.g., metal, conductive rubber, conductive fabric, conductive silicone, etc.), but is not limited thereto.

[0040] The coil (116) may be wound along the entire length in the axial direction of the ferrite core (115) or along a portion of its length. The coil (116) may be electrically connected to the capacitor section (13).

[0041] The capacitor section (13) may include a plurality of capacitors connected in parallel. Each capacitor on the printed circuit board may have a different capacitance and may be trimmed during the manufacturing process.

[0043] FIG. 3 is a drawing for explaining an electronic device according to one embodiment.

[0044] Referring to FIG. 3, the electronic device (2) may include a wireless communication unit (210), a memory (220), an interface unit (230), a power supply unit (240), a display unit (250), a touch module (260), and a control unit (270), etc. Since the components illustrated in FIG. 3 are not essential for implementing the electronic device, the electronic device described in this disclosure may have more or fewer components than those listed above.

[0045] In an embodiment, the wireless communication unit (210) may include one or more modules that enable wireless communication between the electronic device (2) and a wireless communication system, between the electronic device (2) and another electronic device, or between the electronic device (2) and an external server. Additionally, the wireless communication unit (210) may include one or more modules that connect the electronic device (2) to one or more networks.

[0046] In an embodiment, the wireless communication unit (210) may include a wireless internet module (211) and a short-range communication module (212), etc.

[0047] The wireless internet module (211) refers to a module for wireless internet access and can be embedded in an electronic device (2). The wireless internet module (211) is configured to transmit and receive wireless signals in a communication network according to wireless internet technologies. Examples of wireless internet technologies include WLAN (Wireless LAN), Wi-Fi (Wireless-Fidelity), Wi-Fi (Wireless Fidelity) Direct, DLNA (Digital Living Network Alliance), WiBro (Wireless Broadband), WiMAX (World Interoperability for Microwave Access), HSDPA (High Speed ​​Downlink Packet Access), HSUPA (High Speed ​​Uplink Packet Access), NR (New Radio), LTE (Long Term Evolution), LTE-A (Long Term Evolution-Advanced), etc., and the wireless internet module (211) can transmit and receive data according to at least one wireless internet technology within a range that includes internet technologies not listed above.

[0048] The short-range communication module (212) is for short-range communication and can support short-range communication by using at least one of Bluetooth™, RFID (Radio Frequency Identification), Infrared Data Association (IrDA), UWB (Ultra Wideband), ZigBee, NFC (Near Field Communication), Wi-Fi, Wi-Fi Direct, and Wireless USB (Wireless Universal Serial Bus) technologies. In an embodiment, the short-range communication module (212) can support wireless communication between the electronic device (2) and a wireless communication system, between the electronic device (2) and a wireless communication-enabled device, or between the electronic device (2) and a network where an external server is located, through a short-range wireless communication network. The short-range wireless communication network may be a short-range wireless personal area network.

[0049] In an embodiment, the wireless communication capable device may be a mobile terminal (e.g., a smartphone, tablet PC, notebook, etc.) capable of exchanging (or interacting with) data with the electronic device (2). A short-range communication module (212) may detect (or recognize) a wireless communication capable device capable of communicating with the electronic device (2) in the vicinity of the electronic device (2). In an embodiment, if the detected wireless communication capable device is a device authenticated to communicate with the electronic device (2) according to one embodiment, the control unit (270) may transmit at least a portion of the data processed in the electronic device (2) to the wireless communication capable device through the short-range communication module (212). Thus, the user of the wireless communication capable device may use the data processed in the electronic device (2) through the wireless communication capable device.

[0050] In an embodiment, the memory (220) can store data that supports various functions of the electronic device (2). The memory (220) can store a number of application programs (or applications) running on the electronic device (2), data for the operation of the electronic device (2), and instructions.

[0051] The interface section (230) can perform the role of interfacing with various types of external devices connected to the electronic device (2). In an embodiment, the interface section (230) may include at least one of a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device equipped with an identification module, an audio I / O (Input / Output) port, a video I / O port, and an earphone port.

[0052] The power supply unit (240) can receive external power and internal power under the control of the control unit (270) and supply power to each component included in the electronic device (2). In an embodiment, the power supply unit (240) includes a battery, and the battery may be a built-in battery or a replaceable battery.

[0053] The display unit (250) can display (output) information processed by the electronic device (2). For example, the display unit (250) can display execution screen information of an application running on the electronic device (2), or UI (User Interface) and GUI (Graphic User Interface) information based on such execution screen information.

[0054] The display unit (250) may include an LCD display (liquid crystal display), an OLED (organic light-emitting diode) display, an e-ink display, a quantum-dot light-emitting display, a micro LED (light-emitting diode) display, etc.

[0055] The display unit (250) may include a display panel (251) that displays an image and a display controller (252) connected to the display panel (251) that supplies signals for displaying the image to the display panel (251). For example, the display panel (251) may have a plurality of pixels connected to signal lines such as a plurality of scan lines and a plurality of data lines, and a scan driving / receiving unit that supplies a scan signal to the scan lines. The display controller (252) may include a data driving IC that generates a data signal applied to the data lines, a timing controller that processes the image signal to control the overall operation of the display unit (250), a power management IC, etc.

[0056] The touch module (260) can detect a touch (or touch input) applied to a touch area using a capacitance method. As an example, the touch module (260) may be configured to convert changes such as capacitance, voltage, or current occurring in a specific area into an electrical input signal. The touch module (260) may be configured to detect the location, area, and capacitance at the time of touch of a touch object applying a touch to the touch area on the touch module (260). Here, the touch object is an object that applies a touch to the touch sensor, and may be, for example, a part of the user's body (finger, palm, etc.), a passive or active stylus pen (10), etc.

[0057] The touch module (260) may include a touch panel (261) on which a touch electrode is located, and a touch controller (262) that applies a driving signal to the touch panel (261), receives a detection signal from the touch panel (261), and transmits touch data to a control unit (270) and / or a display controller (252).

[0058] The display panel (251) and the touch panel (261) may form a layered structure or be formed as a single unit and may be referred to as a touch screen (20).

[0059] The control unit (270) controls the operation of the electronic device (2) and can output touch coordinate information in response to the touch detection result of the electronic device (2). In addition, the control unit (270) can change the frequency of the driving signal in response to the touch detection result.

[0060] In addition to operations related to the application program, the control unit (270) can generally control the overall operation of the electronic device (2). The control unit (270) can provide or process appropriate information or functions to the user by processing signals, data, information, etc. that are input or output through the components described above, or by running an application program stored in memory (220).

[0061] In an embodiment, the control unit (270) can control at least some of the components described in FIG. 3 to run an application program stored in memory (220). In an embodiment, the control unit (270) can operate at least two or more of the components included in the electronic device (2) in combination with each other to run the application program.

[0062] Although it has been described above that the touch module (260) is included in the electronic device (2) together with the display unit (250), the electronic device (2) may include only the touch module (260).

[0064] FIG. 4 is a drawing for explaining a touch device according to one embodiment.

[0065] Referring to FIG. 4, a touch module (i.e., a touch device) (260) may include a touch controller (262) that controls a touch panel (261) and a touch sensor (261). The touch controller (262) may include a first driving / receiving unit (2620) and a second driving / receiving unit (2622) that transmit and receive signals to and from the touch panel (261), and a control unit (2624).

[0066] A touch panel (261) may include a plurality of first touch electrodes (111-1 to 111-m) for detecting touch coordinates in a first direction and a plurality of second touch electrodes (121-1 to 121-n) for detecting touch coordinates in a second direction intersecting the first direction. For example, the plurality of first touch electrodes (111-1 to 111-m) may have a shape extended in the second direction, and the plurality of second touch electrodes (121-1 to 121-n) may have a shape extended in the first direction. Within the touch panel (261), the plurality of first touch electrodes (111-1 to 111-m) may be arranged along the first direction, and the plurality of second touch electrodes (121-1 to 121-n) may be arranged along the second direction.

[0067] The first driving / receiving unit (2620) can apply a driving signal to a plurality of first touch electrodes (111-1 to 111-m). The second driving / receiving unit (2622) can receive a detection signal from a plurality of second touch electrodes (121-1 to 121-n).

[0068] Although the touch panel (261) has been described above as being implemented in a mutual capacitance manner, the touch panel (261) may be implemented in a self-capacitance manner, and it would be easy for a person skilled in the art to modify the touch electrodes (111-1 to 111-m, 121-1 to 121-n), the first driving / receiving unit (2620), and the second driving / receiving unit (2622) in the mutual capacitance manner to be suitable for the self-capacitance manner by appropriately modifying them, adding new components, or omitting some components.

[0069] In an embodiment, the touch panel (261) may include a plurality of self-capacitance type touch electrodes, and in this case, the touch electrodes may be arranged in a dot shape or may be arranged in a shape extended in one direction as described above.

[0071] FIG. 5 is a diagram illustrating signal transmission between a stylus pen and an electronic device according to one embodiment.

[0072] Referring to FIG. 5(a), the touch screen (20a) may include a digitizer (29), a display panel (251), and a touch panel (261). The touch panel (261) may include a touch electrode layer (21) and a window (22).

[0073] In the case of a passive stylus pen using the Electro-Magnetic Resonance (EMR) method, when a digitizer (29) transmits a magnetic signal (B) to the EMR stylus pen (10a), the resonant circuit included in the stylus pen (10a) can resonate according to the magnetic signal (B). Then, the digitizer (33) can receive the resonated magnetic signal (B) from the stylus pen (10a).

[0074] The digitizer (29) can be attached below the display panel (251) and may include a Flexible Printed Circuit Board (FPCB) having multiple conductive antenna loops formed thereon and a ferrite sheet that blocks the magnetic field generated by the antenna loops and blocks eddy currents that may be generated in other electrical elements and components when the antenna loops form a magnetic field.

[0075] Referring to FIG. 5(b), the touch screen (20b) may include a display panel (251) and a touch panel (261). The touch panel (261) may include a touch electrode layer (21) and a window (22).

[0076] In the case of a stylus pen (10) including a resonant circuit, when the electrode of the touch electrode layer (21) transmits a magnetic signal (B) to the stylus pen (10), the resonant circuit included in the stylus pen (10) can resonate with the magnetic signal (B). Then, the electrode of the touch electrode layer (21) can receive resonant electromagnetic signals (E and B) from the stylus pen (10). If the electrode of the touch electrode layer (21) is formed with a metal mesh having low resistance, detection of the magnetic signal from the stylus pen (10) may be possible.

[0077] Compared to the digitizer (29), the touch screen (20b) does not require an additional unit or module to transmit magnetic signals to the stylus pen (10), so the touch screen (20b) can be made thin and has advantages in terms of manufacturing costs.

[0078] Referring to FIG. 5(c), the touch screen (20c) may include a loop coil (264), a display panel (251), and a touch panel (261). The touch panel (261) may include a touch electrode layer (21) and a window (22).

[0079] In the case of a stylus pen (10) including a resonant circuit, when the loop coil (264) transmits a magnetic signal (B) to the stylus pen (10), the resonant circuit included in the stylus pen (10) can resonate with the magnetic signal (B). Then, the electrode of the touch electrode layer (21) can receive the resonant electromagnetic signals (E and B) from the stylus pen (10).

[0080] Compared to the digitizer (29), the loop coil (264) does not receive a magnetic signal (B) for detecting the touch position, so the wiring structure is simple, which may enable the touch screen (20b) to be thinned. Since the loop coil (264) can be formed in various sizes and locations, such a touch screen (20c) may also be applicable to a foldable / flexible electronic device (2).

[0081] The loop coil (264) may include a substrate on which the antenna loop is located and a ferrite sheet. The antenna loop may be formed from a conductive material such as copper, silver, etc. In addition to the substrate, the antenna loop may be located on the same layer as the touch electrode layer (21), in which case the antenna loop may be formed from a conductive material exhibiting high transmittance and low impedance such as a metal mesh, ITO, graphene, silver nanowire, etc. Additionally, the antenna loop may be located under the window, in which case the substrate may not be included in the loop coil (264).

[0082] Referring to FIG. 5 (d), the touch screen (20d) may include a display panel (251) and a touch panel (261). The touch panel (261) may include a touch electrode layer (21) and a window (22).

[0083] In the case of an active stylus pen (10') including a resonant circuit, the resonant circuit included in the active stylus pen (10') can resonate using a power source (e.g., a battery or a capacitor) within the active stylus pen (10'). Then, the electrodes of the touch electrode layer (21) can receive resonant electromagnetic signals (E and B) from the stylus pen (10'). If the electrodes of the touch electrode layer (21) are formed with a metal mesh having low resistance, detection of magnetic signals from the stylus pen (10') may be possible.

[0085] FIG. 6 is a diagram illustrating the direction of a magnetic field generated by a touch panel, a display panel, and a flexible circuit board according to one embodiment.

[0086] Referring to FIG. 6(a), the touch screen (20) may include a display panel (251), a touch panel (261), and a flexible printed circuit board (FPCB) (270).

[0087] In an embodiment, the flexible circuit board (270) may be located at the bottom of the display panel (251). The flexible circuit board (270) may be connected to the display panel (251) through a connector (271).

[0088] In an embodiment, the display panel (251) may be located on the flexible circuit board (270). The display panel (251) may be located below the touch panel (261). The display panel (251) may be located between the touch panel (261) and the flexible circuit board (270).

[0089] In an embodiment, the touch panel (261) may be located on the display panel (251). The touch panel (261) may be located on the flexible circuit board (270).

[0090] Referring to FIG. 6(b), the current of the touch panel (261) may flow in a counter-clockwise direction. The direction of the magnetic field generated by the touch panel (261) may be the direction coming out of the touch panel (261) due to the current flowing in a counter-clockwise direction.

[0091] In the embodiment, the current of the flexible circuit board (270) may flow in a clockwise direction. The direction of the magnetic field generated by the flexible circuit board (270) may be the direction in which the clockwise-flowing current enters the touch panel (261).

[0092] In the embodiment, in the area where the touch panel (261) and the flexible circuit board (270) are placed in overlap, both the magnetic field of the touch panel (261) and the magnetic field of the flexible circuit board (270) may be generated. Since the direction of the magnetic field of the touch panel (261) is the direction coming out of the touch panel (261) and the magnetic field of the flexible circuit board (270) is the direction entering the touch panel (261), destructive interference may occur between the magnetic field of the touch panel (261) and the magnetic field of the flexible circuit board (270) in the area where the touch panel (261) and the flexible circuit board (270) are placed in overlap. As destructive interference occurs in the area where the touch panel (261) and the flexible circuit board (270) are placed in overlap, the strength of the magnetic field may be lower than in the area where the touch panel (261) and the flexible circuit board (270) are not placed in overlap. In the area where the touch panel (261) and the flexible circuit board (270) are placed in overlap, destructive interference occurs, so a magnetic signal that the stylus pen (10) cannot identify may be output. In the area where the touch panel (261) and the flexible circuit board (270) are placed in overlap, destructive interference occurs, so the magnetic signal output by the stylus pen (10) may not be identified. In order to increase the magnitude of the magnetic signal output or received in the area where the touch panel (261) and the flexible circuit board (270) are placed in overlap, it may be necessary to place an additional sheet between the display panel (251) and the flexible circuit board (270) or on the underside of the flexible circuit board.

[0094] FIG. 7 is a drawing for explaining a touch device including a shielding sheet and a metal sheet according to one embodiment.

[0095] Referring to FIG. 7(a), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), and a first metal sheet (291). The first shielding sheet (281) and the first metal sheet (291) may be located between the display panel (261) and the flexible circuit board (270). The touch panel (261) may be located on the display panel (251).

[0096] In the embodiment, the first metal sheet (291) may be a copper sheet or a manganese sheet. In the embodiment, the first metal sheet (291) may serve as a ground or absorb heat generated from the flexible circuit board.

[0097] In an embodiment, the first metal sheet (291) may be positioned on a flexible circuit board (270). The first metal sheet (291) may be positioned between the first shielding sheet (281) and the flexible circuit board (270).

[0098] In an embodiment, the first shielding sheet (281) can block the magnetic field generated by the stylus pen (10). In an embodiment, the first shielding sheet (281) may be positioned on the first metal sheet (291). The first shielding sheet (281) may be positioned between the display panel (251) and the first metal sheet (291).

[0099] Referring to FIG. 7(b), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a second shielding sheet (282), and a first metal sheet (291).

[0100] In an embodiment, the first shielding sheet (281) and the second shielding sheet (282) may be located between the display panel (251) and the first metal sheet (291). The first shielding sheet (281) and the second shielding sheet (282) may be located on the same plane. The second shielding sheet (282) may be located in an area where the touch panel (261) and the flexible circuit board (270) are placed in an overlapping manner.

[0101] In the embodiment, the first shielding sheet (281) and the second shielding sheet (282) may have different shielding rates. In the embodiment, the shielding rate of the second shielding sheet (282) may be higher than the shielding rate of the first shielding sheet (281). In the embodiment, the permeability of the second shielding sheet (282) may be higher than the permeability of the first shielding sheet (281).

[0102] In another embodiment, the shielding rate of the second shielding sheet (282) may be lower than the shielding rate of the first shielding sheet (281). The permeability of the second shielding sheet (282) may be lower than the permeability of the first shielding sheet (281).

[0103] In the embodiment, the shielding rate may be a value indicating the degree to which the first shielding sheet (281) and the second shielding sheet (282) block a magnetic field. In the embodiment, a shielding sheet with a high shielding rate may block a magnetic field to a greater degree than a shielding sheet with a low shielding rate. A shielding sheet with a low shielding rate may block a magnetic field to a lower degree than a shielding sheet with a high shielding rate.

[0104] In an embodiment, the shielding rate of the first shielding sheet (281) or the second shielding sheet (282) may be determined based on the permeability of the first shielding sheet (281) or the second shielding sheet (282). Permeability may be a value indicating the degree to which an internal magnetic material of the first shielding sheet (281) or the second shielding sheet (282) is magnetized by a magnetic field.

[0105] In the embodiment, the shielding rate of the first shielding sheet (281) or the second shielding sheet (282) may be proportional to the permeability of the first shielding sheet (281) or the second shielding sheet (282). In the embodiment, the higher the permeability of the first shielding sheet (281) or the second shielding sheet (282), the higher the shielding rate of the first shielding sheet (281) or the second shielding sheet (282). In the embodiment, the lower the permeability of the first shielding sheet (281) or the second shielding sheet (282), the lower the shielding rate of the first shielding sheet (281) or the second shielding sheet (282).

[0106] Referring to FIG. 7 (c), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a second shielding sheet (282), and a first metal sheet (291).

[0107] In an embodiment, the first shielding sheet (281) may be positioned on the first metal sheet (291). The first shielding sheet (281) may be positioned between the display panel (251) and the first metal sheet (291).

[0108] In an embodiment, the second shielding sheet (282) may be positioned on the flexible circuit board (270). The second shielding sheet (282) may be positioned between the display panel (251) and the flexible circuit board (270).

[0109] In an embodiment, the first shielding sheet (281) and the second shielding sheet (282) may have different shielding rates. In an embodiment, the second shielding sheet (282) may be thicker than the first shielding sheet (281). In another embodiment, the second shielding sheet (282) may be thinner than the first shielding sheet (281).

[0110] In the embodiment, the shielding rate of the first shielding sheet (281) or the second shielding sheet (282) may be determined based on the thickness of the first shielding sheet (281) or the second shielding sheet (282). In the embodiment, the shielding rate of the first shielding sheet (281) or the second shielding sheet (282) may be proportional to the thickness of the first shielding sheet (281) or the second shielding sheet (282). In the embodiment, the thicker the thickness of the first shielding sheet (281) or the second shielding sheet (282), the higher the shielding rate of the first shielding sheet (281) or the second shielding sheet (282). In the embodiment, the thinner the thickness of the first shielding sheet (281) or the second shielding sheet (282), the lower the shielding rate of the first shielding sheet (281) or the second shielding sheet (282).

[0111] Referring to FIG. 7 (d), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a second shielding sheet (282), and a first metal sheet (291).

[0112] In an embodiment, the first shielding sheet (281) and the second shielding sheet (282) may be positioned on the first metal sheet (291). The first shielding sheet (281) and the second shielding sheet (282) may be positioned between the display panel (251) and the first metal sheet (291).

[0113] In the embodiment, the shielding rate of the second shielding sheet (282) may be higher than the shielding rate of the first shielding sheet (281). In the embodiment, the second shielding sheet (282) may be thicker than the first shielding sheet (281).

[0114] In an embodiment, a second shielding sheet (282) having a higher shielding rate than the first shielding sheet (281) may be located in an area where the touch panel (261) and the flexible circuit board (270) are placed in an overlapping manner. In an embodiment, the second shielding sheet (282) may increase the magnitude of the magnetic signal output or received in the area where the touch panel (261) and the flexible circuit board (270) are placed in an overlapping manner.

[0116] FIG. 8 is a drawing for explaining a touch device including a metal sheet located on the lower part of a flexible circuit board according to one embodiment.

[0117] Referring to FIG. 8(a), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a first metal sheet (291), and a second metal sheet (292).

[0118] In an embodiment, the second metal sheet (292) may be located on the lower part of the flexible circuit board (270). In an embodiment, the second metal sheet (292) may be a copper sheet or a manganese sheet.

[0119] In an embodiment, the flexible circuit board (270) may be positioned on the second metal sheet (292). The flexible circuit board (270) may be positioned between the first metal sheet (291) and the second metal sheet (292).

[0120] In an embodiment, the first metal sheet (291) may be positioned on a flexible circuit board (270). The first metal sheet (291) may be positioned between the first shielding sheet (281) and the flexible circuit board (270).

[0121] In an embodiment, the first shielding sheet (281) may be positioned on the first metal sheet (291). The first shielding sheet (281) may be positioned between the display panel (251) and the first metal sheet (291).

[0122] Referring to FIG. 8(b), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a first metal sheet (291), and a second metal sheet (292).

[0123] In an embodiment, the second metal sheet (292) may be located on the lower part of the flexible circuit board (270). The first metal sheet (291) may be located on the flexible circuit board (270). In an embodiment, the first metal sheet (291) and the second metal sheet (292) may be in contact.

[0124] Referring to FIG. 8 (c), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a second shielding sheet (282), a first metal sheet (291), and a second metal sheet (292).

[0125] In an embodiment, the first shielding sheet (281) and the second shielding sheet (282) may be positioned between the display panel (251) and the first metal sheet (291). In an embodiment, the shielding rate of the second shielding sheet (282) may be higher than the shielding rate of the first shielding sheet (281).

[0126] In an embodiment, the flexible circuit board (270) may be positioned between the first metal sheet (291) and the second metal sheet (292). The second metal sheet (292) may be positioned below the flexible circuit board (270). In an embodiment, the second metal sheet (292) positioned below the flexible circuit board (270) may increase the magnitude of the magnetic signal output or received in the area where the touch panel (261) and the flexible circuit board (270) are placed in an overlapping manner.

[0128] FIG. 9 is a drawing for explaining a touch device including a shielding sheet located on the lower part of a flexible circuit board according to one embodiment.

[0129] Referring to FIG. 9(a), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a third shielding sheet (283), a first metal sheet (291), and a second metal sheet (292).

[0130] In an embodiment, the second metal sheet (292) may be located below the third shielding sheet (283).

[0131] In an embodiment, the third shielding sheet (283) may be positioned on the second metal sheet (292). The third shielding sheet (283) may be positioned between the flexible circuit board (270) and the second metal sheet (292).

[0132] In an embodiment, the flexible circuit board (270) may be positioned on the third shielding sheet (283). The flexible circuit board (270) may be positioned between the first metal sheet (291) and the third shielding sheet (283).

[0133] In an embodiment, the first metal sheet (291) may be positioned on a flexible circuit board (270). The first metal sheet (291) may be positioned between the first shielding sheet (281) and the flexible circuit board (270).

[0134] In an embodiment, the first shielding sheet (281) may be positioned on the first metal sheet (291). The first shielding sheet (281) may be positioned on the display panel (251) and the first metal sheet (291).

[0135] In the embodiment, the shielding rate of the third shielding sheet (283) may be higher than the shielding rate of the first shielding sheet (281). The third shielding sheet (283) may have a higher permeability or a thicker thickness than the first shielding sheet (281).

[0136] In another embodiment, the shielding rate of the third shielding sheet (283) may be lower than the shielding rate of the first shielding sheet (281). The third shielding sheet (283) may have a lower permeability or a thinner thickness than the first shielding sheet (281).

[0137] In an embodiment, the touch panel (261) may be located on the display panel (251).

[0138] Referring to FIG. 9(b), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a second shielding sheet (282), a third shielding sheet (283), a first metal sheet (291), and a second metal sheet (292).

[0139] In an embodiment, the first shielding sheet (281) and the second shielding sheet (282) may be positioned between the display panel (251) and the first metal sheet (291). In an embodiment, the shielding rate of the second shielding sheet (282) may be higher than the shielding rate of the first shielding sheet (281).

[0140] In an embodiment, the third shielding sheet (283) may be positioned on the second metal sheet (292). The third shielding sheet (283) may be positioned between the flexible circuit board (270) and the second metal sheet (292).

[0141] In an embodiment, the shielding rate of the third shielding sheet (283) may be higher than the shielding rate of the second shielding sheet (282). The third shielding sheet (283) may have a higher permeability or a thicker thickness than the second shielding sheet (282). In an embodiment, the third shielding sheet (283) may increase the magnitude of the magnetic signal output or received in the area where the touch panel (261) and the flexible circuit board (270) are placed in overlap.

[0143] FIG. 10 is a drawing for explaining a touch device including a metal sheet positioned on a flexible circuit board according to one embodiment.

[0144] Referring to FIG. 10 (a), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a first metal sheet (291), and a third metal sheet (293).

[0145] In an embodiment, the third metal sheet (293) may be positioned on the flexible circuit board (270). The third metal sheet (293) may be positioned between the first metal sheet (291) and the flexible circuit board (270).

[0146] In an embodiment, the first metal sheet (291) may be positioned on the third metal sheet (293). The first metal sheet (291) may be positioned between the first shielding sheet (281) and the third metal sheet (293).

[0147] In an embodiment, the first shielding sheet (281) may be positioned on the first metal sheet (291). The first shielding sheet (281) may be positioned between the display panel (251) and the first metal sheet (291).

[0148] In an embodiment, the touch panel (261) may be located on the display panel (251).

[0149] In an embodiment, a third metal sheet (293) located between the first metal sheet (291) and the flexible circuit board (270) can increase the magnitude of the magnetic signal output or received in the area where the touch panel (261) and the flexible circuit board (270) are overlapped.

[0150] Referring to FIG. 10(b), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a second shielding sheet (282), a first metal sheet (291), and a third metal sheet (293).

[0151] In an embodiment, the first shielding sheet (281) and the second shielding sheet (282) may be positioned between the display panel (251) and the first metal sheet (291). In an embodiment, the shielding rate of the second shielding sheet (282) may be higher than the shielding rate of the first shielding sheet (281).

[0152] In an embodiment, the first metal sheet (291) may be positioned between the first shielding sheet (281), the second shielding sheet (282), and the third metal sheet (293). The third metal sheet (293) may be positioned between the first metal sheet (291) and the flexible circuit board (270).

[0154] FIG. 11 is a drawing for explaining a touch device including a shielding sheet located on a flexible circuit board according to one embodiment.

[0155] Referring to FIG. 11 (a), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a fourth shielding sheet (284), a first metal sheet (291), and a third metal sheet (293).

[0156] In an embodiment, the third metal sheet (293) may be positioned on the flexible circuit board (270). The third metal sheet (293) may be positioned between the fourth shielding sheet (284) and the flexible circuit board (270).

[0157] In an embodiment, the fourth shielding sheet (284) may be positioned on the third metal sheet (293). The fourth shielding sheet (284) may be positioned between the first metal sheet (291) and the third metal sheet (293).

[0158] In an embodiment, the first metal sheet (291) may be positioned on the fourth shielding sheet (284). The first metal sheet (291) may be positioned between the first shielding sheet (281) and the fourth shielding sheet (284).

[0159] In an embodiment, the first shielding sheet (281) may be positioned on the first metal sheet (291). The first shielding sheet (281) may be positioned between the display panel (251) and the first metal sheet (291).

[0160] In the embodiment, the shielding rate of the fourth shielding sheet (284) may be higher than the shielding rate of the first shielding sheet (281). The fourth shielding sheet (284) may have a higher permeability or a thicker thickness than the first shielding sheet (281).

[0161] In another embodiment, the shielding rate of the fourth shielding sheet (284) may be lower than the shielding rate of the first shielding sheet (281). The fourth shielding sheet (284) may have a lower permeability or a thinner thickness than the first shielding sheet (281).

[0162] In an embodiment, the touch panel (261) may be located on the display panel (251).

[0163] Referring to FIG. 11 (b), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a second shielding sheet (282), a fourth shielding sheet (284), a first metal sheet (291), and a third metal sheet (293).

[0164] In an embodiment, the first shielding sheet (281) and the second shielding sheet (282) may be positioned between the display panel (251) and the first metal sheet (291). In an embodiment, the shielding rate of the second shielding sheet (282) may be higher than the shielding rate of the first shielding sheet (281).

[0165] In an embodiment, the fourth shielding sheet (284) may be positioned on the third metal sheet (293). The fourth shielding sheet (284) may be positioned between the first metal sheet (291) and the third metal sheet (293).

[0166] In an embodiment, the shielding rate of the fourth shielding sheet (284) may be higher than the shielding rate of the second shielding sheet (282). The fourth shielding sheet (284) may have a higher permeability or a thicker thickness than the second shielding sheet (282). In an embodiment, the fourth shielding sheet (284) may increase the magnitude of the magnetic signal output or received in the area where the touch panel (261) and the flexible circuit board (270) are placed in overlap.

[0168] FIG. 12 is a drawing for illustrating another example of a touch device including a shielding sheet and a metal sheet according to one embodiment.

[0169] Referring to FIG. 12 (a), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a fourth shielding sheet (284), a first metal sheet (291), a second metal sheet (292), and a third metal sheet (293).

[0170] In an embodiment, the second metal sheet (292) may be located on the lower part of the flexible circuit board (270).

[0171] In an embodiment, the flexible circuit board (270) may be positioned on the second metal sheet (292). The flexible circuit board (270) may be positioned between the third metal sheet (293) and the second metal sheet (292).

[0172] In an embodiment, the third metal sheet (293) may be positioned on the flexible circuit board (270). The third metal sheet (293) may be positioned between the fourth shielding sheet (284) and the flexible circuit board (270).

[0173] In an embodiment, the fourth shielding sheet (284) may be positioned on the third metal sheet (293). The fourth shielding sheet (284) may be positioned between the first metal sheet (291) and the third metal sheet (293).

[0174] In an embodiment, the first metal sheet (291) may be positioned on the fourth shielding sheet (284). The first metal sheet (291) may be positioned between the first shielding sheet (281) and the fourth shielding sheet (284).

[0175] In an embodiment, the first shielding sheet (281) may be positioned on the first metal sheet (291). The first shielding sheet (281) may be positioned between the display panel (251) and the first metal sheet (291). In an embodiment, the shielding rate of the first shielding sheet (281) may be lower than the shielding rate of the fourth shielding sheet (284).

[0176] In an embodiment, the touch panel (261) may be located on the display panel (251).

[0177] Referring to FIG. 12(b), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a second shielding sheet (282), a fourth shielding sheet (284), a first metal sheet (291), a second metal sheet (292), and a third metal sheet (293).

[0178] In an embodiment, the first shielding sheet (281) and the second shielding sheet (282) may be positioned between the display panel (251) and the first metal sheet (291). In an embodiment, the shielding rate of the second shielding sheet (282) may be higher than the shielding rate of the first shielding sheet (281).

[0179] In an embodiment, the fourth shielding sheet (284) may be positioned on the third metal sheet (293). The fourth shielding sheet (284) may be positioned between the first metal sheet (291) and the third metal sheet (293). In an embodiment, the shielding rate of the fourth shielding sheet (284) may be higher than the shielding rate of the second shielding sheet (282).

[0180] In an embodiment, the second shielding sheet (282), the fourth shielding sheet (284), the second metal sheet (292), and the third metal sheet (293) included in the touch screen (20) can increase the magnitude of the magnetic signal output or received in the area where the touch panel (261) and the flexible circuit board (270) are placed in overlap.

[0182] FIG. 13 is a drawing for illustrating a flexible circuit board including a ground shielding layer and a line pattern layer according to one embodiment.

[0183] Referring to FIG. 13 (a), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a fourth shielding sheet (284), and a first metal sheet (291).

[0184] In an embodiment, the fourth shielding sheet (284) may be positioned on the flexible circuit board (270). The fourth shielding sheet (284) may be positioned between the first metal sheet (291) and the flexible circuit board (270).

[0185] In an embodiment, the first metal sheet (291) may be positioned on the fourth shielding sheet (284). The first metal sheet (291) may be positioned between the first shielding sheet (281) and the fourth shielding sheet (284).

[0186] In an embodiment, the first shielding sheet (281) may be positioned on the first metal sheet (291). The first shielding sheet (281) may be positioned between the display panel (251) and the first metal sheet (291).

[0187] In an embodiment, the touch panel (261) may be located on the display panel (251).

[0188] In an embodiment, the flexible circuit board (270) may include a plurality of ground shielding layers and a line pattern layer (274). In an embodiment, the flexible circuit board (270) may include a first ground shielding layer (272), a second ground shielding layer (273), and a third ground shielding layer (275).

[0189] In an embodiment, the line pattern layer (274) may be located on the third ground shielding layer (275). The third ground shielding layer (275) may be located below the line pattern layer (274).

[0190] In an embodiment, the second ground shielding layer (273) may be located on the line pattern layer (274). The second ground shielding layer (273) may be located between the first ground shielding layer (272) and the line pattern layer (274).

[0191] In an embodiment, the first ground shielding layer (272) may be located on the second ground shielding layer (273). The first ground shielding layer (272) may be located between the fourth shielding sheet (284) and the first ground shielding layer (272).

[0192] In an embodiment, the first ground shielding layer (272), the second ground shielding layer (273), and the third ground shielding layer (275) included in the flexible circuit board (270) can serve as ground instead of the second metal sheet (292) and the third metal sheet (293) of FIG. 12. In an embodiment, the first ground shielding layer (272), the second ground shielding layer (273), and the third ground shielding layer (275) can increase the magnitude of the magnetic signal output or received in the area where the touch panel (261) and the flexible circuit board (270) are placed in overlap.

[0193] Referring to FIG. 13(b), the flexible circuit board (270) may include a line pattern layer (274). The line pattern layer (274) may be a layer containing a line pattern drawn on the flexible circuit board (270). In an embodiment, the length of the line pattern included in the line pattern layer (274) may vary depending on the position of the line pattern. In an embodiment, the length of the line pattern placed at the edge of the flexible circuit board (270) or the line pattern layer (274) may be longer than the length of the line pattern placed at the center of the flexible circuit board (270) or the line pattern layer (274).

[0194] In an embodiment, the length of the first line pattern (PATTERN1) placed at the first edge (EDGE1) of the flexible circuit board (270) or line pattern layer (274) may be longer than the length of the second line pattern (PATTERN2) placed at the center (CENTER) of the flexible circuit board (270) or line pattern layer (274). In an embodiment, the length of the third line pattern (PATTERN3) placed at the second edge (EDGE2) of the flexible circuit board (270) or line pattern layer (274) may be longer than the length of the second line pattern (PATTERN2) placed at the center (CENTER) of the flexible circuit board (270) or line pattern layer (274).

[0195] In an embodiment, a line pattern layer (274) in which the length of the line pattern placed at the edge of the flexible circuit board (270) is longer than the length of the line pattern placed at the center of the flexible circuit board (270) can increase the magnitude of the magnetic signal output or received in the area where the touch panel (261) and the flexible circuit board (270) are placed in overlap.

[0197] FIG. 14 is a drawing for illustrating a touch device in which the length of a line pattern layer according to one embodiment is shorter than a preset length.

[0198] Referring to FIG. 14 (a) and (b), the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a fourth shielding sheet (284), a first metal sheet (291), a second metal sheet (292), and a third metal sheet (293). The flexible circuit board (270) may include a line pattern layer (274).

[0199] In the embodiment, the length of the line pattern layer (274) of FIG. 14 (a) may be a first length (LENGTH1).

[0200] In an embodiment, the length of the line pattern layer (274) of FIG. 14 (b) may be shorter than a preset length. In an embodiment, the length of the line pattern layer (274) of FIG. 14 (b) may be a second length (LENGTH2) that is shorter than a first length (LENGTH1). In an embodiment, the length of the line pattern placed on the line pattern layer (274) of FIG. 14 (a) may be shorter than the length of the line pattern placed on the line pattern layer (274) of FIG. 14 (b).

[0201] In the embodiment, the shorter the length of the line pattern layer (274), the greater the magnitude of the magnetic signal output or received in the area where the touch panel (261) and the flexible circuit board (270) are placed in overlap.

[0203] FIG. 15 is a drawing for illustrating another example of a touch device in which the length of a line pattern layer according to one embodiment is shorter than a preset length.

[0204] Referring to FIG. 15, the touch screen (20) may include a display panel (251), a touch panel (261), a flexible circuit board (270), a first shielding sheet (281), a fourth shielding sheet (284), a first metal sheet (291), a second metal sheet (292), and a third metal sheet (293). The flexible circuit board (270) may include a line pattern layer (274) and an acrylic plate (276).

[0205] In an embodiment, the line pattern layer (274) may be positioned in a curved shape on the second metal sheet (292). In an embodiment, when the line pattern layer (274) is positioned in a curved shape on the second metal sheet (292), the length of the line pattern layer (274) may be shortened from a first length (LENGTH1 in FIG. 14) to a second length (LENGTH2). The line pattern may be arranged along the curved line pattern layer (274). When the length of the line pattern layer (274) is shortened, the magnitude of the magnetic signal output or received in the area where the touch panel (261) and the flexible circuit board (270) are placed in overlap may be increased.

[0206] In one embodiment, the line pattern layer (274) may be in the shape of the Korean character "ㄷ". In another embodiment, the line pattern layer (274) may be in the shape of the subset symbol "⊂". In yet another embodiment, the line pattern layer (274) may be in the shape of the alphabet "C".

[0207] Although embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.

Claims

Claim 1 A touch device comprising: a flexible circuit board; a touch panel located on the flexible circuit board; a first metal sheet located between the touch panel and the flexible circuit board; and a first shielding sheet located between the touch panel and the first metal sheet, wherein at least one of the metal sheet and the shielding sheet is located between the flexible circuit board and the first metal sheet. Claim 2 A touch device according to claim 1, further comprising a second shielding sheet located between the touch panel and the first metal sheet and located on the same plane as the first shielding sheet. Claim 3 In claim 2, the second shielding sheet is a touch device having a higher shielding rate than the first shielding sheet. Claim 4 In claim 2, the second shielding sheet is a touch device having a lower shielding rate than the first shielding sheet. Claim 5 A touch device according to claim 1, further comprising a second metal sheet located below the flexible circuit board. Claim 6 A touch device according to claim 5, further comprising a third shielding sheet positioned between the second metal sheet and the flexible circuit board. Claim 7 A touch device according to claim 1, further comprising a third metal sheet located between the flexible circuit board and the first metal sheet. Claim 8 A touch device further comprising, in claim 7, a fourth shielding sheet located between the first metal sheet and the third metal sheet. Claim 9 In claim 8, the fourth shielding sheet is a touch device having a higher shielding rate than the first shielding sheet. Claim 10 A touch device according to claim 1, further comprising a fourth shielding sheet located between the flexible circuit board and the first metal sheet; wherein the flexible circuit board comprises a line pattern layer; and a first ground shielding layer located on the line pattern layer. Claim 11 A touch device according to claim 10, wherein the flexible circuit board comprises a second ground shielding layer located below the line pattern layer. Claim 12 A touch device according to claim 1, wherein the flexible circuit board comprises a line pattern layer in which the length of a line pattern placed at the edge of the flexible circuit board is longer than the length of a line pattern placed at the center of the flexible circuit board. Claim 13 A touch device according to claim 1, wherein the flexible circuit board comprises a line pattern layer having a line pattern whose length is shorter than a preset length. Claim 14 A touch system comprising: a touch device including a touch panel; and a stylus pen that resonates based on a signal received from the touch device; wherein the touch device comprises: a flexible circuit board; a touch panel located on the flexible circuit board; a first metal sheet located between the touch panel and the flexible circuit board; a first shielding sheet located between the touch panel and the first metal sheet; and a second metal sheet located below the flexible circuit board, wherein at least one of the metal sheet and the shielding sheet is located between the flexible circuit board and the first metal sheet. Claim 15 In claim 14, the touch device comprises a second shielding sheet positioned between the touch panel and the first metal sheet, and having a shielding rate different from that of the first shielding sheet; a touch system. Claim 16 In claim 14, the touch device comprises a third shielding sheet positioned between the flexible circuit board and the second metal sheet; a touch system. Claim 17 In claim 14, the touch device comprises a fourth shielding sheet positioned between the flexible circuit board and the first metal sheet; a touch system. Claim 18 In claim 17, the touch device comprises a third metal sheet positioned between the flexible circuit board and the fourth shielding sheet; a touch system. Claim 19 In claim 17, the fourth shielding sheet is a touch system with a lower shielding rate than the first shielding sheet. Claim 20 In claim 14, the touch device comprises a fourth shielding sheet located between the flexible circuit board and the first metal sheet; and the flexible circuit board comprises a line pattern layer; and a ground shielding layer located on the line pattern layer; a touch system.

Images