KR20180049630A - Touch input apparatus using a stylus pen and method for removing noise thereof - Google Patents

Abstract

The present invention relates to a touch input device using a stylus pen capable of removing noises of input signals; and a noise removing method thereof. The touch input device comprises: a stylus pen; a touch panel which has a plurality of electrodes arranged thereon and changes capacitance formed among electrodes according to contact or proximity of the stylus pen; and a control unit which senses capacitance changes of the touch panel to detect a location, writing pressure and inclination of the stylus pen, and performs functions corresponding to the same. The control unit comprises: an amplification unit which amplifies signals received from electrodes of the touch panel; a multiplexing unit which multiplexes signals output from the amplification unit; a noise removing unit which removes noises of signals output from the multiplexing unit; and a signal analysis unit which detects a location, writing pressure and an inclination of the stylus pen from signals from which noises are removed.

Description

TECHNICAL FIELD [0001] The present invention relates to a touch input device using a stylus pen and a method for removing noise from the touch input device,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch input apparatus using a stylus pen capable of removing noise of an input signal and a noise removing method therefor.

2. Description of the Related Art [0002] In the information age in recent years, a display field for visually expressing electrical information signals has been greatly developed. Various display devices having excellent performance such as thinning, lightening, and low power consumption have been developed.

Such a display device includes a touch panel capable of recognizing a touch region through a human hand or a separate input means and transmitting corresponding information thereto.

Here, the touch panel may be attached to the outside of the display device, and may be classified into a resistance method, a capacitance method, and an infrared ray detection method according to a touch sensing method.

As a means of inputting the touch panel, many stylus pens capable of handwriting and drawing are used. The stylus pen is capable of inputting more finely than the input by a finger, and has various functions such as detailed drawing and writing, There is an advantage to support.

However, when the user inputs information to the touch panel using the stylus pen, the position and the inclination of the stylus pen can not be accurately detected due to the influence of the noise included in the input signal, There were occasions when an error occurred.

Accordingly, there is a demand for a touch input device capable of removing noise included in an input signal and minimizing errors by accurately measuring the tilt and position of the stylus pen.

The present invention is directed to solving the above-mentioned problems and other problems. Another object of the present invention is to provide a touch input device using a stylus pen capable of removing noise of an input signal by an IQ modulation method and a noise canceling method thereof.

Another object of the present invention is to separate the electrodes of the touch panel into two pairs of electrodes located on both sides of each electrode and to process signals received therefrom so that the position of the stylus pen, A touch input device using a stylus pen capable of detecting a touch and a noise removing method therefor.

Another object of the present invention is to provide a touch input device using a stylus pen capable of performing an additional function according to pressure intensity applied to a user input button of a stylus pen by disposing a pressure sensor on the stylus pen and a noise removing method thereof.

Another object of the present invention is to provide a touch input device using a stylus pen capable of supplying power by converting a pressure applied to a user input button into an electric signal by disposing a pressure element in the stylus pen and a noise removing method thereof.

Another object of the present invention is to provide a touch input device using a stylus pen that generates a user notification that vibrates a piezoelectric element of a stylus pen when a specific event occurs, and a method for removing the noise.

Another object of the present invention is to arrange at least one of the interval, the line width and the number of the electrodes located in the central region of the touch panel and the electrodes located in the edge region of the touch panel differently to increase the touch detection rate in the central region of the touch panel A touch input device using a stylus pen and a noise removing method thereof.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

A touch input device using a stylus pen according to an embodiment of the present invention includes a stylus pen, a touch panel having a plurality of electrodes arranged thereon and having a variable capacitance formed between the electrodes according to contact or proximity of the stylus pen, A controller for sensing the position, the pressure, and the tilt of the stylus pen by sensing a change in capacitance of the touch panel, and performing a function corresponding to the detected position; A multiplexer for multiplexing a signal output from the amplifying unit, a noise removing unit for removing noise from the signal output from the multiplexing unit, and a signal analyzing unit for detecting the position, the pressure, and the tilt of the stylus pen from the noise- can do.

A method for removing noise in a touch input device using a stylus pen according to an embodiment of the present invention includes the steps of checking whether the stylus pen is in contact with or proximity to the touch panel, A step of amplifying the signal received from the electrode of the touch panel, a step of multiplexing the amplified signal, a step of removing the noise of the multiplexed signal, Detecting a position, a pressure and a tilt of the stylus pen from the noise canceled signal, and performing a function corresponding to at least one of the position, the pressure, and the tilt of the detected stylus pen have.

Effects of the touch input device and the noise removing method using the stylus pen according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, by removing the noise of the input signal by the IQ modulation method, the position, the pressure and the inclination of the stylus pen can be accurately detected and the error can be minimized.

According to at least one of the embodiments of the present invention, the electrodes of the touch panel are separated into a pair of electrodes having pairs of electrodes located on both sides of each electrode, and the signals received from the pairs are processed, The position of the pen, the pressure and the inclination of the pen can be detected.

According to at least one of the embodiments of the present invention, a pressure sensor may be disposed in the stylus pen to perform additional functions according to the pressure intensity applied to the user input button of the stylus pen, thereby providing user convenience.

According to at least one of the embodiments of the present invention, a pressure element is disposed in the stylus pen, and the pressure applied to the user input button is converted into an electric signal to enable power supply, thereby reducing power consumption.

According to at least one of the embodiments of the present invention, when a specific event occurs, a user notification that vibrates the piezoelectric element of the stylus pen is generated, thereby providing user convenience.

According to at least one of the embodiments of the present invention, at least one of the electrode positioned in the central region of the touch panel and the electrode positioned in the edge region of the touch panel is arranged at different intervals, It is possible to provide the user convenience that can increase the touch detection rate of the area.

Further scope of applicability of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and specific examples, such as the preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art.

1 is a block diagram illustrating a touch input device according to the present invention.
2 is a view showing a touch input device including a stylus pen according to an embodiment of the present invention
3 is a block diagram illustrating a configuration module of a touch input device according to an exemplary embodiment of the present invention.
4 and 5 are circuit diagrams illustrating the touch input service module of FIG.
6 is a diagram showing an amplitude spectrum of a signal synthesized in a mixer of a noise canceling unit.
7 is a graph showing signal modulation of each channel output from the noise removing unit.
8 is a view showing the inclination of the stylus pen and the electrode of the touch panel.
9 is a view showing the structure of the stylus pen.
10 is a view showing the LC circuit portion of FIG.
11 to 15 are diagrams for explaining the process of detecting the inclination of the stylus pen.
16 to 19 are views showing a stylus pen according to an embodiment of the present invention.
20 and 21 are cross-sectional views showing the electrode arrangement of the touch panel according to the present invention.
22 and 23 are flowcharts for explaining a touch detection method of the touch input device according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The touch input device using the stylus pen described in the present specification may be applied to various devices such as a camera, a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (PDA) Navigation, a slate PC, a tablet PC, an ultrabook, a wearable device (e.g., a smartwatch, a glass glass, an HMD (head) mounted display) or the like.

However, it should be understood by those skilled in the art that the configuration of the touch input device according to the embodiments described herein may be applied to a fixed terminal such as a digital TV, a desktop computer, a digital signage, and the like, It will be easy to see.

1 is a block diagram illustrating a touch input device according to the present invention.

1, the touch input device 100 includes a wireless communication unit 110, an input unit 120, a sensing unit 140, an output unit 150, an interface unit 160, a memory 170, A control unit 180, a power supply unit 190, and the like. The components shown in FIG. 1 are not essential for implementing a touch input device, so that the touch input device described in this specification can have more or fewer components than those listed above.

The wireless communication unit 110 may be connected between the touch input device 100 and the wireless communication system or between the touch input device 100 and another touch input device 100 or between the touch input device 100 ) And an external server. ≪ RTI ID = 0.0 > [0002] < / RTI > The wireless communication unit 110 may include one or more modules for connecting the touch input device 100 to one or more networks.

The wireless communication unit 110 may include at least one of a broadcast receiving module 111, a mobile communication module 112, a wireless Internet module 113, a short distance communication module 114, and a location information module 115 .

The input unit 120 includes a camera 121 or an image input unit for inputting a video signal, a microphone 122 for inputting an audio signal, an audio input unit, a user input unit 123 for receiving information from a user A touch key, a mechanical key, and the like). The voice data or image data collected by the input unit 120 may be analyzed and processed by a user's control command.

The sensing unit 140 may include at least one sensor for sensing at least one of information in the touch input device, surrounding environment information surrounding the touch input device, and user information. For example, the sensing unit 140 may include a proximity sensor 141, an illumination sensor 142, a touch sensor, an acceleration sensor, a magnetic sensor, A G-sensor, a gyroscope sensor, a motion sensor, an RGB sensor, an infrared sensor, a finger scan sensor, an ultrasonic sensor, A microphone 226, a battery gauge, an environmental sensor (for example, a barometer, a hygrometer, a thermometer, a radiation detection sensor, A thermal sensor, a gas sensor, etc.), a chemical sensor (e.g., an electronic nose, a healthcare sensor, a biometric sensor, etc.). Meanwhile, the touch input device disclosed in the present specification can combine and utilize information sensed by at least two of the sensors.

The output unit 150 includes at least one of a display unit 151, an acoustic output unit 152, a haptic tip module 153, and a light output unit 154 to generate an output related to visual, auditory, can do. The display unit 151 may have a mutual layer structure with the touch sensor or may be integrally formed to realize a touch screen. The touch screen functions as a user input unit 123 that provides an input interface between the touch input device 100 and a user and can provide an output interface between the touch input device 100 and a user.

The interface unit 160 serves as a communication path with various kinds of external devices connected to the touch input device 100. The interface unit 160 is connected to a device having a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, And may include at least one of a port, an audio I / O port, a video I / O port, and an earphone port. In the touch input device 100, corresponding to an external device being connected to the interface unit 160, it is possible to perform appropriate control related to the connected external device.

In addition, the memory 170 stores data supporting various functions of the touch input device 100. The memory 170 may store a plurality of application programs (application programs or applications) driven by the touch input device 100, data for operation of the touch input device 100, and commands. At least some of these applications may be downloaded from an external server via wireless communication. At least some of these application programs may exist on the touch input device 100 from the time of shipment for basic functions of the touch input device 100 (e.g., phone call incoming, outgoing call function, message reception, have. The application program may be stored in the memory 170 and installed on the touch input device 100 and may be driven by the control unit 180 to perform the operation (or function) of the touch input device.

In addition to the operations related to the application program, the control unit 180 typically controls the overall operation of the touch input device 100. [ The control unit 180 may process or process signals, data, information, and the like input or output through the above-mentioned components, or may drive an application program stored in the memory 170 to provide or process appropriate information or functions to the user.

In addition, the controller 180 may control at least some of the components illustrated in FIG. 1 in order to drive an application program stored in the memory 170. Further, the control unit 180 controls the operation of the touch input device 100 by the user of the touch input device 100 as security information for transaction using at least a specific account among the components included in the touch input device 100, Two or more registered ones can be operated in combination with each other.

The power supply unit 190 receives external power and internal power under the control of the controller 180 and supplies power to the components included in the touch input device 100. The power supply unit 190 includes a battery, which may be an internal battery or a replaceable battery.

At least some of the components may operate in cooperation with each other to implement a method of operating, controlling, or controlling the touch input device according to various embodiments described below. In addition, the operation, control, or control method of the touch input device may be implemented on the touch input device by driving at least one application program stored in the memory 170.

Hereinafter, the components listed above will be described in more detail with reference to FIG. 1 before explaining various embodiments implemented through the touch input device 100 as described above.

First, referring to the wireless communication unit 110, the broadcast receiving module 111 of the wireless communication unit 110 receives broadcast signals and / or broadcast-related information from an external broadcast management server through a broadcast channel. The broadcast channel may include a satellite channel and a terrestrial channel. Two or more broadcast receiving modules may be provided to the mobile terminal 100 for simultaneous broadcast reception or broadcast channel switching for at least two broadcast channels.

The broadcast management server may refer to a server for generating and transmitting broadcast signals and / or broadcast related information, or a server for receiving broadcast signals and / or broadcast related information generated by the broadcast management server and transmitting the generated broadcast signals and / or broadcast related information. The broadcast signal may include a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and a broadcast signal in which a data broadcast signal is combined with a TV broadcast signal or a radio broadcast signal.

The broadcasting signal may be encoded according to at least one of technical standards for transmitting and receiving a digital broadcasting signal (or a broadcasting system, for example, ISO, IEC, DVB, ATSC, etc.) It is possible to receive the digital broadcasting signal using a method conforming to the technical standard defined by the technical standards.

The broadcast-related information may be information related to a broadcast channel, a broadcast program, or a broadcast service provider. The broadcast-related information may also be provided through a mobile communication network. In this case, it may be received by the mobile communication module 112.

The broadcast-related information may exist in various forms, for example, an Electronic Program Guide (EPG) of Digital Multimedia Broadcasting (DMB) or an Electronic Service Guide (ESG) of Digital Video Broadcast-Handheld (DVB-H). The broadcast signal and / or broadcast related information received through the broadcast receiving module 111 may be stored in the memory 160.

The mobile communication module 112 may be a mobile communication module or a mobile communication module such as a mobile communication module or a mobile communication module that uses technology standards or a communication method (e.g., Global System for Mobile communication (GSM), Code Division Multi Access (CDMA), Code Division Multi Access 2000 (Enhanced Voice-Data Optimized or Enhanced Voice-Data Only), Wideband CDMA (WCDMA), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), Long Term Evolution And an external terminal, or a server on a mobile communication network established according to a long term evolution (AR), a long term evolution (AR), or the like.

The wireless signal may include various types of data depending on a voice call signal, a video call signal or a text / multimedia message transmission / reception.

The wireless Internet module 113 refers to a module for wireless Internet access, and may be embedded in the touch input device 100 or externally. The wireless Internet module 113 is configured to transmit and receive a wireless signal in a communication network according to wireless Internet technologies.

Wireless Internet technologies include, for example, wireless LAN (WLAN), wireless fidelity (Wi-Fi), wireless fidelity (Wi-Fi) Direct, DLNA (Digital Living Network Alliance), WiBro Interoperability for Microwave Access, High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), Long Term Evolution (LTE) and Long Term Evolution-Advanced (LTE-A) 113 transmit and receive data according to at least one wireless Internet technology, including Internet technologies not listed above.

The wireless Internet module 113 for performing a wireless Internet connection through the mobile communication network can be used for wireless Internet access by WiBro, HSDPA, HSUPA, GSM, CDMA, WCDMA, LTE or LTE- May be understood as a kind of the mobile communication module 112.

The short-range communication module 114 is for short-range communication. The short-range communication module 114 includes Bluetooth (Radio Frequency Identification), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, NFC Field Communication), Wi-Fi (Wireless-Fidelity), Wi-Fi Direct, and Wireless USB (Wireless Universal Serial Bus) technology. Or between the touch input device 100 and the wireless communication system, between the touch input device 100 and another touch input device 100, or between the touch input device 100 and another touch input device 100 through wireless local area networks And may support wireless communication between the network where the device 100 or the external server is located. The short-range wireless communication network may be Wireless Personal Area Networks (WLANs).

Here, the other touch input device 100 is a wearable device capable of interchanging (or interlocking) data with the touch input device 100 according to the present invention, for example, a smartwatch, Smart glass, HMD (head mounted display)). The short range communication module 114 can detect (or recognize) a wearable device capable of communicating with the touch input device 100 around the touch input device 100. [ If the detected wearable device is a device authenticated to communicate with the touch input device 100 according to the present invention, the controller 180 may control at least part of the data processed in the touch input device 100, Module 114 to the wearable device. Therefore, the user of the wearable device can use the data processed by the touch input device 100 through the wearable device. For example, according to this, when a phone is received in the touch input device 100, the user performs a phone call through the wearable device, or when a message is received in the touch input device 100, It is possible to confirm the received message.

The position information module 115 is a module for obtaining the position (or current position) of the touch input device, and representative examples thereof include a Global Positioning System (GPS) module or a Wireless Fidelity (WiFi) module. For example, when the touch input device utilizes a GPS module, the position of the touch input device can be obtained using a signal transmitted from the GPS satellite. As another example, the touch input device can utilize a Wi-Fi module to acquire the position of the touch input device based on information of a wireless access point (wireless AP) that transmits or receives a wireless signal with the Wi-Fi module have. Optionally, the location information module 115 may perform any of the other modules of the wireless communication unit 110 to obtain data relating to the location of the touch input device, in addition or alternatively. The position information module 115 is a module used for obtaining the position (or current position) of the touch input device, and is not limited to a module for directly calculating or acquiring the position of the touch input device.

Next, the input unit 120 is for inputting image information (or signal), audio information (or signal), data, or information input from a user. For inputting image information, the touch input apparatus 100 One or more cameras 121 may be provided. The camera 121 processes image frames such as still images or moving images obtained by the image sensor in the video communication mode or the photographing mode. The processed image frame may be displayed on the display unit 151 or stored in the memory 170. [ A plurality of cameras 121 provided in the touch input device 100 may be arranged to have a matrix structure and the touch input device 100 may be provided with various angles or shapes through a camera 121 having a matrix structure. A plurality of pieces of image information having a focus can be input. In addition, the plurality of cameras 121 may be arranged in a stereo structure to acquire a left image and a right image for realizing a stereoscopic image.

The microphone 122 processes the external acoustic signal into electrical voice data. The processed voice data can be utilized variously according to a function (or an application program being executed) being performed in the touch input device 100. Meanwhile, the microphone 122 may be implemented with various noise reduction algorithms for eliminating noise generated in receiving an external sound signal.

The control unit 180 controls the operation of the touch input device 100 so as to correspond to the input information when the information is input through the user input unit 123. The user input unit 123 is used to receive information from the user, have. The user input unit 123 may include a mechanical input unit (or a mechanical key, for example, a button located on the front, rear, or side of the touch input apparatus 100, a dome switch, , Jog switches, etc.) and touch-type input means. For example, the touch-type input means may comprise a virtual key, a soft key or a visual key displayed on the touch screen through software processing, The virtual key or the visual key can be displayed on the touch screen with various forms. For example, the virtual key or the visual key can be displayed on the touch screen, ), An icon, a video, or a combination thereof.

Meanwhile, the sensing unit 140 senses at least one of information in the touch input device, surrounding environment information surrounding the touch input device, and user information, and generates a corresponding sensing signal. The control unit 180 may control the driving or operation of the touch input device 100 or may perform data processing, function, or operation related to the application program installed in the touch input device 100 based on the sensing signal. Representative sensors among various sensors that may be included in the sensing unit 140 will be described in more detail.

First, the proximity sensor 141 refers to a sensor that detects the presence of an object approaching a predetermined detection surface, or the presence of an object in the vicinity of the detection surface, without mechanical contact by using electromagnetic force or infrared rays. The proximity sensor 141 may be disposed in the inner region of the touch input device or the proximity sensor 141 near the touch screen.

Examples of the proximity sensor 141 include a transmission type photoelectric sensor, a direct reflection type photoelectric sensor, a mirror reflection type photoelectric sensor, a high frequency oscillation type proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, and an infrared proximity sensor. In the case where the touch screen is electrostatic, the proximity sensor 141 can be configured to detect the proximity of the object with a change of the electric field along the proximity of the object having conductivity. In this case, the touch screen (or touch sensor) itself may be classified as a proximity sensor.

On the other hand, for convenience of explanation, the act of recognizing that the object is located on the touch screen in proximity with no object touching the touch screen is referred to as "proximity touch & The act of actually touching an object on the screen is called a "contact touch. &Quot; The position at which the object is closely touched on the touch screen means a position where the object corresponds to the touch screen vertically when the object is touched. The proximity sensor 141 can detect a proximity touch and a proximity touch pattern (e.g., a proximity touch distance, a proximity touch direction, a proximity touch speed, a proximity touch time, a proximity touch position, have. Meanwhile, the control unit 180 processes data (or information) corresponding to the proximity touch operation and the proximity touch pattern sensed through the proximity sensor 141 as described above, and further provides visual information corresponding to the processed data It can be output on the touch screen. Further, the control unit 180 can control the touch input device 100 such that different actions or data (or information) are processed depending on whether the touch on the same point on the touch screen is a proximity touch or a touch contact have.

The touch sensor uses a touch (or touch input) applied to the touch screen (or the display unit 151) by using at least one of various touch methods such as a resistance film type, a capacitive type, an infrared type, an ultrasonic type, Detection.

For example, the touch sensor may be configured to convert a change in a pressure applied to a specific portion of the touch screen or a capacitance generated in a specific portion to an electrical input signal. The touch sensor may be configured to detect a position, an area, a pressure at the time of touch, a capacitance at the time of touch, and the like where a touch object touching the touch screen is touched on the touch sensor. Here, the touch object may be a finger, a touch pen, a stylus pen, a pointer, or the like as an object to which a touch is applied to the touch sensor.

Thus, when there is a touch input to the touch sensor, the corresponding signal (s) is sent to the touch controller. The touch controller processes the signal (s) and transmits the corresponding data to the controller 180. Thus, the control unit 180 can know which area of the display unit 151 is touched or the like. Here, the touch controller may be a separate component from the control unit 180, and may be the control unit 180 itself.

On the other hand, the control unit 180 may perform different controls or perform the same control according to the type of the touch object touching the touch screen (or a touch key provided on the touch screen). Whether to perform different controls or to perform the same control depending on the type of the touch target object can be determined according to the operation state of the current touch input device 100 or an application program being executed.

On the other hand, the touch sensors and the proximity sensors discussed above can be used independently or in combination to provide a short touch (touch), a long touch, a multi touch, a drag touch ), Flick touch, pinch-in touch, pinch-out touch, swipe touch, hovering touch, and the like. Touch can be sensed.

The ultrasonic sensor can recognize the position information of the object to be sensed by using ultrasonic waves. Meanwhile, the controller 180 can calculate the position of the wave generating source through the information sensed by the optical sensor and the plurality of ultrasonic sensors. The position of the wave source can be calculated using the fact that the light is much faster than the ultrasonic wave, that is, the time when the light reaches the optical sensor is much faster than the time the ultrasonic wave reaches the ultrasonic sensor. More specifically, the position of the wave generating source can be calculated using the time difference with the time when the ultrasonic wave reaches the reference signal.

The camera 121 includes at least one of a camera sensor (for example, a CCD, a CMOS, etc.), a photo sensor (or an image sensor), and a laser sensor.

The camera 121 and the laser sensor may be combined with each other to sense a touch of the sensing object with respect to the three-dimensional stereoscopic image. The photosensor can be laminated to the display element, which is adapted to scan the movement of the object to be detected proximate to the touch screen. More specifically, the photosensor mounts photo diodes and TRs (Transistors) in a row / column and scans the contents loaded on the photosensor using an electrical signal that varies according to the amount of light applied to the photo diode. That is, the photo sensor performs coordinate calculation of the object to be sensed according to the amount of change of light, and position information of the object to be sensed can be obtained through the calculation.

The display unit 151 displays (outputs) information to be processed by the touch input device 100. For example, the display unit 151 may display execution screen information of an application program driven by the touch input device 100 or UI (User Interface) and GUI (Graphic User Interface) information corresponding to the execution screen information have.

In addition, the display unit 151 may be configured as a stereoscopic display unit for displaying a stereoscopic image.

In the stereoscopic display unit, a three-dimensional display system such as a stereoscopic system (glasses system), an autostereoscopic system (no-glasses system), and a projection system (holographic system) can be applied.

Generally, 3D stereoscopic images consist of left image (left eye image) and right image (right eye image). A top-down method of arranging a left image and a right image in one frame according to a method in which a left image and a right image are combined into a three-dimensional stereoscopic image, A checker board system in which pieces of a left image and a right image are arranged in a tile form, a left-to-right (right-side) Or an interlaced method in which rows are alternately arranged, and a time sequential (frame-by-frame) method in which right and left images are alternately displayed in time.

In addition, the 3D thumbnail image may generate a left image thumbnail and a right image thumbnail from the left image and right image of the original image frame, respectively, and may be generated as one image as they are combined. In general, a thumbnail means a reduced image or a reduced still image. The left image thumbnail and the right image thumbnail generated in this way are displayed on the screen with a difference of the left and right distance by the depth corresponding to the parallax between the left image and the right image, thereby exhibiting a stereoscopic spatial feeling.

The left and right images necessary for realizing the three-dimensional stereoscopic image can be displayed on the stereoscopic display unit by the stereoscopic processing unit. The stereoscopic processing unit receives a 3D image (an image at a reference time point and an image at an expansion point), sets a left image and a right image therefrom, or receives a 2D image and converts it into a left image and a right image.

The sound output unit 152 may output audio data received from the wireless communication unit 110 or stored in the memory 170 in a call signal reception mode, a call mode or a recording mode, a voice recognition mode, a broadcast reception mode, The sound output unit 152 also outputs sound signals related to functions (e.g., call signal reception sound, message reception sound, etc.) performed in the touch input device 100. [ The audio output unit 152 may include a receiver, a speaker, a buzzer, and the like.

The haptic module 153 generates various tactile effects that the user can feel. A typical example of the haptic effect generated by the haptic module 153 may be vibration. The intensity and pattern of the vibration generated in the haptic module 153 can be controlled by the user's selection or the setting of the control unit. For example, the haptic module 153 may synthesize and output different vibrations or sequentially output the vibrations.

In addition to vibration, the haptic module 153 may be configured to perform various functions such as a pin arrangement vertically moving with respect to the contact skin surface, a spraying force or suction force of the air through the injection port or the suction port, a touch on the skin surface, And various tactile effects such as an effect of reproducing a cold sensation using an endothermic or exothermic element can be generated.

The haptic module 153 can transmit the tactile effect through the direct contact, and the tactile effect can be felt by the user through the muscles of the finger or arm. At least two haptic modules 153 may be provided according to the configuration of the touch input device 100.

The light output unit 154 outputs a signal for notifying the occurrence of an event using the light of the light source of the touch input apparatus 100. Examples of the events generated in the touch input device 100 include a message reception, a call signal reception, a missed call, an alarm, a schedule notification, an email reception, information reception through an application, and the like.

The signal output by the light output unit 154 is implemented as the touch input device emits light of a single color or a plurality of colors to the front or rear surface. The signal output may be terminated by the touch input device sensing the user's event confirmation.

The interface unit 160 serves as a path for communication with all external devices connected to the touch input device 100. The interface unit 160 receives data from an external device or receives power from the external device and transmits the data to each component in the touch input device 100 or transmits data in the touch input device 100 to an external device. For example, a port for connecting a device equipped with a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, an audio I / O port, a video I / O port, an earphone port, and the like may be included in the interface unit 160.

The identification module is a chip for storing various information for authenticating the use right of the touch input device 100 and includes a user identification module (UIM), a subscriber identity module (SIM) A universal subscriber identity module (USIM), and the like. Devices with identification modules (hereinafter referred to as "identification devices") can be manufactured in a smart card format. Accordingly, the identification device can be connected to the terminal 100 through the interface unit 160. [

When the touch input device 100 is connected to an external cradle, the interface unit 160 may be a path through which the power from the cradle is supplied to the touch input device 100, The touch input device 100 may receive various command signals inputted thereto. Various command signals or power from the cradle can be operated as a signal for recognizing that the touch input device 100 is correctly mounted on the cradle.

The memory 170 may store a program for the operation of the controller 180 and temporarily store input / output data (e.g., a phone book, a message, a still image, a moving picture, etc.). The memory 170 may store data related to vibration and sound of various patterns outputted when a touch is input on the touch screen.

The memory 170 may be a flash memory type, a hard disk type, a solid state disk type, an SDD type (Silicon Disk Drive type), a multimedia card micro type ), Card type memory (e.g., SD or XD memory), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read memory, a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, and / or an optical disk. The touch input device 100 may operate in association with a web storage that performs a storage function of the memory 170 on the Internet.

Meanwhile, as described above, the control unit 180 controls the operation related to the application program and the general operation of the touch input device 100. [ For example, when the state of the touch input device satisfies a set condition, the control unit 180 can execute or release a lock state for restricting input of a user's control command to applications.

In addition, the control unit 180 performs control and processing related to voice communication, data communication, video call, or the like, or performs pattern recognition processing to recognize handwriting input or drawing input performed on the touch screen as characters and images, respectively . Further, the control unit 180 may control any one or a plurality of the above-described components in order to implement various embodiments described below on the touch input device 100 according to the present invention.

The power supply unit 190 receives external power and internal power under the control of the controller 180 and supplies power necessary for operation of the respective components. The power supply unit 190 includes a battery, the battery may be an internal battery configured to be chargeable, and may be detachably coupled to the terminal body for charging or the like.

In addition, the power supply unit 190 may include a connection port, and the connection port may be configured as an example of an interface 160 through which an external charger for supplying power for charging the battery is electrically connected.

As another example, the power supply unit 190 may be configured to charge the battery in a wireless manner without using the connection port. In this case, the power supply unit 190 may use at least one of an inductive coupling method based on a magnetic induction phenomenon from an external wireless power transmission apparatus and a magnetic resonance coupling method based on an electromagnetic resonance phenomenon Power can be delivered.

In the following, various embodiments may be embodied in a recording medium readable by a computer or similar device using, for example, software, hardware, or a combination thereof.

FIG. 2 is a diagram illustrating a touch input device including a stylus pen according to an embodiment of the present invention, and FIG. 3 is a block diagram illustrating a configuration module of a touch input device according to an exemplary embodiment of the present invention.

2 and 3, a touch input apparatus 100 according to an embodiment of the present invention includes a controller 180, a display unit 151, a memory 170, a touch panel 10, and a stylus pen 20 ).

Here, the memory 170 may store application and reference signal pattern information. The memory 170 may store one or a plurality of applications. The application may be a native application installed at the time of shipment of the touch input device 100 or at the time of OS / firmware upgrade, or may be an application that a user of the touch input device 100 separately downloads and installs from an external server.

Also, the reference signal pattern information may be a reference value for detecting the position, the pressure, and the tilt of the stylus pen 20. The reference signal pattern information may be stored at the time of shipment of the touch input apparatus 100 or at the time of OS / firmware upgrade, or may be separately downloaded from an external server by the user of the touch input apparatus 100 and stored.

The display unit 151 may display functions performed according to the position, pressure, and tilt information of the stylus pen 20.

The control unit 180 may include a touch input service module 190. 3, the touch input service module 190 is implemented in the controller 180. However, according to the embodiment, the touch input service module 190 may include a separate memory, a memory 170, . The touch input service module 190 may be implemented in a touch input device or in an OS / firmware upgrade.

For example, the control unit 180 senses the change in capacitance of the touch panel 10, detects the position, the pressure and the inclination of the stylus pen 20, and can perform a corresponding function. That is, the control unit 180 removes the noise of the input signal received from the touch panel 10, detects the position, the pressure and the inclination of the stylus pen from the noise-removed signal, and detects the position of the detected stylus pen, And a slope of the image data.

The control unit 180 may include an amplifying unit, a multiplexing unit, a noise removing unit, and a signal analyzing unit. Here, the amplifying unit amplifies the signal received from the electrode of the touch panel 10, and the multiplexing unit multiplexes the signal output from the amplifying unit. The noise removing unit removes the noise of the signal output from the multiplexing unit, The analyzing unit can detect the position, the pressure, and the tilt of the stylus pen from the noise canceled signal.

For example, the amplifying unit may be a differential amplifying unit that amplifies a difference between two electric signals received from two electrodes of each electrode pair of the touch panel 10. [ Here, the electrode pair of the touch panel 10 may be an electrode pair having two pairs of electrodes located on both sides of each electrode.

Between the amplifying unit and the multiplexing unit, a filter unit for filtering the signal amplified from the amplifying unit may be included. Here, the filter unit may include at least one high-frequency filter unit that filters only the high-frequency signal from the amplified signal, and at least one low-frequency filter unit that filters only the low-frequency signal from the filtered high-frequency signal.

The noise removing unit includes a first mixer for combining the signal output from the multiplexer with an inphase input signal, a second mixer for synthesizing a quadrature input signal with the signal output from the multiplexer, A first low frequency filter section for filtering only low frequency signals from a signal output from the mixer to remove noise; a second low frequency filter section for filtering only low frequency signals from the signal output from the second mixer to remove noise; A second analog-to-digital conversion section for converting the filtered signal from the second low-frequency filter section into a digital signal, and a second analog-to-digital conversion section for converting the signal filtered from the filter section into a digital signal, And a combining unit for combining the first signal outputted from the converting unit and the second signal outputted from the second analog-to-digital converting unit to generate a difference signal Can.

Next, the signal analyzer can analyze the amplitude of the noise-free signal and detect the position of the stylus pen according to the analyzed signal amplitude.

In some cases, the signal analyzing unit can analyze the frequency of the noise canceled signal and detect the pressure of the stylus pen according to the analyzed signal frequency.

In other cases, the signal analyzing unit can compare the noise canceled signal with the reference signal, analyze the movement deviation between the two signals, and detect the inclination of the stylus pen 20 according to the analyzed movement deviation. Here, when detecting the inclination of the stylus pen 20, the signal analyzer can recognize that the stylus pen 20 is perpendicular to the surface of the touch panel 10 when the calculated movement error is zero. Then, when detecting the inclination of the stylus pen 20, the signal analyzer can recognize that the stylus pen 20 is horizontal with respect to the surface of the touch panel, if the computed movement deviation is the maximum value.

For example, the inclination of the stylus pen 20 may be gradially increased as the calculated movement deviation is larger, and may be gradially decreased as the calculated movement deviation is smaller. Here, the inclination of the stylus pen 20 may be an angle between the vertical line perpendicular to the surface of the touch panel 10 and the stylus pen 20.

In some cases, the tilt information of the stylus pen 20 corresponding to the movement error may be stored in advance in the memory 170, and the tilt information of the stylus pen 20 may be stored in the memory 170 in a direction perpendicular to the surface of the touch panel 10 An angle between the vertical line and the stylus pen 20 may be an angle. Here, when detecting the inclination of the stylus pen 20, the control section may search the memory 170 to detect the inclination information of the stylus pen 20 corresponding to the calculated movement error have.

On the other hand, in the touch panel 10, a plurality of electrodes are arranged, and the electrostatic capacitance formed between the electrodes according to the contact or proximity of the stylus pen 20 can be varied.

The touch panel 10 may include a transparent substrate, a plurality of first electrodes arranged in a first direction on the transparent substrate, and a second electrode arranged in a second direction perpendicular to the first direction on the transparent substrate.

For example, the interval between the first electrodes and the interval between the second electrodes may be equal to each other.

In some cases, the plurality of first electrodes may have a first interval between the first electrodes located in the central region of the touch panel, and a second interval between the first electrodes located in the edge region of the touch panel are different from each other . Here, the first interval between the first electrodes positioned in the central region of the touch panel may be narrower than the second interval between the first electrodes located in the edge region of the touch panel.

In another case, the plurality of second electrodes may be arranged such that the third interval between the second electrodes located in the central region of the touch panel and the fourth interval between the second electrodes located in the edge region of the touch panel are different from each other . Here, the third gap between the second electrodes located in the central region of the touch panel may be narrower than the fourth gap between the second electrodes located in the edge region of the touch panel.

As another example, the number of the first electrodes and the number of the second electrodes may be equal to each other.

In some cases, the number of the first electrodes located in the central region of the touch panel and the number of the first electrodes located in the edge region of the touch panel may be different from each other. Here, the number of the first electrodes located in the central region of the touch panel may be greater than the number of the first electrodes located in the edge region of the touch panel.

In other cases, the number of the second electrodes located in the central region of the touch panel may be different from the number of the second electrodes located in the edge region of the touch panel. Here, the number of the second electrodes located in the central region of the touch panel may be greater than the number of the second electrodes located in the edge region of the touch panel.

As another example, the line width of the first electrode and the line width of the second electrode may be equal to each other.

In some cases, the plurality of first electrodes may have different line widths of the first electrodes positioned in the central region of the touch panel and the line widths of the first electrodes positioned in the edge region of the touch panel. Here, the line width of the first electrodes positioned at the center region of the touch panel may be narrower than the line width of the first electrodes positioned at the edge region of the touch panel.

In another case, the plurality of second electrodes may have line widths of the second electrodes positioned in the central region of the touch panel and line widths of the second electrodes positioned in the edge region of the touch panel. Here, the line width of the second electrodes located in the central region of the touch panel may be narrower than the line width of the second electrodes located in the edge region of the touch panel.

The reason why at least one of the interval, the line width, and the number of the electrodes located in the central region of the touch panel and the electrodes located in the edge region of the touch panel are arranged differently is that the touch detection rate of the central region of the touch panel can be increased Because.

On the other hand, the stylus pen 20 includes a body portion, a pen tip disposed at an end of the body portion to transmit and receive an electric signal to and from the touch panel, a user input button disposed outside the body portion, a pressure sensing the pressure applied to the user input button Sensor, an LC circuit portion electrically connected to the pen tip and the pressure sensor and seated in the body portion.

Here, the control unit 180 may sense a change in capacitance of the touch panel, analyze the pressure intensity applied to the user input button of the stylus pen, and perform a function corresponding to the analyzed pressure intensity.

The stylus pen 20 may further include a piezoelectric element for converting the pressure applied to the user input button into an electric signal. The stylus pen 20 may further include a battery for charging the electric signal converted from the piezoelectric element, As shown in FIG.

Here, when a specific event occurs, the control unit 180 may control the capacitance change of the touch panel to generate a user notification that vibrates the piezoelectric element of the stylus pen.

Then, the control unit 180 can analyze the signal amplitude from the extracted current signal pattern, and detect the position of the stylus pen based on the analyzed signal amplitude. Here, when analyzing the signal amplitude from the extracted current signal pattern, the controller 180 may recognize a point at which the signal amplitude is maximum in the touch panel as the position of the stylus pen.

Further, the control unit 180 can analyze the signal frequency from the extracted current signal pattern, and can detect the pressure of the stylus pen based on the analyzed signal frequency. Here, when analyzing the signal frequency from the extracted current signal pattern, the control unit 180 can analyze that the greater the signal frequency, the larger the stylus pen pressure, and the smaller the signal frequency, the smaller the stylus pen pressure.

4 and 5 are circuit diagrams illustrating the touch input service module of FIG.

4 and 5, the touch input service module of the control unit includes a switching unit 1400, an amplifying unit 1500, a filter unit 1600, a multiplexing unit 1700, a noise removing unit 1800, And a signal analysis unit (not shown).

Here, the switching unit 1400 switches the electrical connection between the electrode of the touch panel and the amplifying unit 1500, the amplifying unit 1500 amplifies the signal received from the electrode of the touch panel, and the multiplexing unit amplifies The noise removing unit removes noise from the signal output from the multiplexing unit, and the signal analyzing unit can detect the position, the pressure, and the tilt of the stylus pen from the noise-removed signal.

For example, the amplifying unit may be a differential amplifying unit that amplifies a difference between two electric signals received from two electrodes of each electrode pair of the touch panel. Here, the electrode pair of the touch panel may be an electrode pair having a pair of two electrodes located on both sides of each electrode.

The touch panel may include a transparent substrate, a plurality of first electrodes 1200 arranged in a first direction on the transparent substrate, and a second electrode 1300 arranged in a second direction perpendicular to the first direction on the transparent substrate The amplifying unit 1500 includes a first amplifying unit 1510 for amplifying a signal received from the first electrode 1200 and a second amplifying unit 1520 for amplifying a signal received from the second electrode 1300. [ ).

For example, the first electrode and the third electrode of the first electrodes 1200 are connected to the first amplification unit of the first amplification unit 1510, and the second electrode of the first electrodes 1200, The fourth electrode may be connected to the second amplification unit of the first amplification unit 1510. That is, the first electrodes 1200 adjacent to each other may be connected to different first amplifying units 1510.

The number of the first electrodes 1200 is larger than the number of the first amplification units 1510. For example, the number of the first electrodes 1200 is twice as many as the number of the first amplification units 1510 Can be more.

The number of the first electrodes 1200 may be the same as the number of the switches of the switching unit 1400 and the switch of the switching unit 1400 may be a touch signal of the first electrode 1200 or a driving signal of the driving unit Any one of them can be switched to the first amplification unit 1510.

The first electrode and the third electrode of the second electrodes 1300 are connected to the first amplifying unit of the second amplifying unit 1520 and the second electrode of the second electrode 1300 Th electrode may be connected to the second amplification unit of the second amplification unit 1520. [ That is, the second electrodes 1300 adjacent to each other may be connected to the second amplifying unit 1520, which are different from each other.

The number of the second electrodes 1300 is larger than the number of the second amplification units 1520. For example, the number of the second electrodes 1300 is twice the number of the second amplification units 1520 Can be more.

Here, the second electrodes 1300 may be directly connected to the second amplification unit 1520 without the switching unit 1400.

The filter unit 1600 includes at least one high frequency filter unit 1610 for filtering only the high frequency signal from the amplified signal from the amplification unit 1500 and at least one low frequency filter 1610 for filtering only the low frequency signal from the filtered high frequency signal. (Not shown).

The multiplexing unit 1700 can multiplex the filtered signal from the filter unit 1600. [

The noise canceling unit 1800 can remove noise of a signal output from the multiplexing unit 1700. For example, noise can be removed through IQ modulation on a signal output from the multiplexing unit 1700 have.

Here, the noise remover 1800 can perform signal processing for each channel of the signal output from the multiplexer 1700 through two signal paths. A first mixer 1810, a first low-pass filter 1830 and a first analog-to-digital converter 1850 are arranged in the first signal path and a second mixer 1820, 2 low-pass filter unit 1840 and a second analog-to-digital converter 1860. The first signal processed through the first signal path and the second signal processed through the second signal path are combined And a combining unit 1870 for generating a difference signal may be disposed.

That is, the noise remover 1800 uses the IQ modulation scheme to convert the channel signal output from the multiplexer 1700 into a first signal which is an I (inphase) signal and a second signal which is a Q (quadrature) And performing a filtering process on the first signal and the second signal, noise can be removed.

For example, the first mixer 1810 synthesizes an inphase input signal with a signal output from the multiplexer 1700, and the second mixer 1820 synthesizes an inphase input signal with a quadrature ) Input signal can be synthesized.

The first low frequency filter unit 1830 filters only the low frequency signal from the signal output from the first mixer 1810 to remove noise and the second low frequency filter unit 1840 filters the low frequency signal from the second mixer 1820 The noise can be removed by filtering only the low frequency signal from the output signal. The reason for performing the signal filtering process is that noise is included in a high frequency region of a signal output from the first and second mixers 1810 and 1820.

Next, the first analog-to-digital converter 1850 converts the filtered signal from the first low-pass filter 1830 into a digital signal to output a first signal which is an I (inphase) signal, The converting unit 1860 may convert the filtered signal from the second low-frequency filter unit 1840 into a digital signal and output a second signal that is a quadrature (Q) signal.

The combining unit 1870 combines the first signal output from the first analog-to-digital converter 1850 and the second signal output from the second analog-to-digital converter 1860 to generate a difference signal .

In this way, the noise canceling unit 1800 uses the IQ modulation method to convert the channel signal output from the multiplexing unit 1700 into a first signal which is an I (inphase) signal and a second signal which is a Q (quadrature) And performing filtering on the first signal and the second signal, noise can be removed. The reason for performing the filtering process is that a first signal which is an I (inphase) signal and a second signal which is a Q (quadrature) signal include a lot of noise in a high frequency region.

Next, the signal analyzer can analyze the amplitude of the noise-free signal and detect the position of the stylus pen according to the analyzed signal amplitude.

In some cases, the signal analyzing unit can analyze the frequency of the noise canceled signal and detect the pressure of the stylus pen according to the analyzed signal frequency.

In another case, the signal analyzing unit can compare the noise canceled signal with the reference signal, analyze the movement deviation between the two signals, and detect the inclination of the stylus pen according to the analyzed movement deviation. Here, when the inclination of the stylus pen is detected, the signal analyzing unit can recognize that the stylus pen is perpendicular to the surface of the touch panel when the calculated movement deviation is zero. Then, when detecting the inclination of the stylus pen, the signal analyzing section can recognize that the stylus pen is horizontal with respect to the surface of the touch panel, if the calculated movement deviation is the maximum value.

For example, the inclination of the stylus pen increases in a gradient manner as the calculated movement deviation increases, and decreases as the calculated movement deviation becomes smaller. Here, the inclination of the stylus pen may be an angle between the vertical line perpendicular to the surface of the touch panel and the stylus pen.

In some cases, the tilt information of the stylus pen corresponding to the movement deviation may be stored in advance in the memory, and the tilt information of the stylus pen may be an angle between the vertical line perpendicular to the surface of the touch panel and the stylus pen. Here, when detecting the inclination of the stylus pen, the control section may search the memory to detect the inclination information of the stylus pen corresponding to the calculated movement error, when the movement deviation is calculated.

FIG. 6 is a graph showing an amplitude spectrum of a signal synthesized in a mixer of a noise removing unit, and FIG. 7 is a graph showing signal modulation of each channel output from a noise removing unit.

The noise removing unit separates the channel signal output from the multiplexer 1700 into a first signal which is an I (inphase) signal and a second signal which is a Q (quadrature) signal by using the IQ modulation method, And the second signal are subjected to the filtering process, noise can be removed.

For example, the first mixer combines the inphase input signal f_ref 0deg with the signal f0 output from the multiplexer, and the second mixer combines the signal f0 output from the multiplexer with the quadrature input signal f_ref 90deg Can be synthesized.

In this case, as shown in FIG. 6, it can be seen that the signal synthesized by the first and second mixers contains more noise signals in the high frequency region of f0 + f_ref than the low frequency region of f0 - f_ref.

Accordingly, the noise removing unit can filter the first signal, which is an I (inphase) signal, and the second signal, which is a Q (quadrature) signal, through a low-pass filter to remove noise included in a high frequency region.

7, the signal analyzer can analyze the amplitude of the noise-removed signal, and can detect the position of the stylus pen according to the analyzed signal amplitude. That is, as shown in FIG. 7, if the signal amplitude is the largest at the channel 4, it can be seen that the stylus pen is located in the electrode region of the channel 4.

Then, the signal analyzing unit can analyze the frequency of the noise canceled signal, and can detect the pressure of the stylus pen according to the analyzed signal frequency.

Further, the signal analyzing unit can compare the signal from which the noise is removed and the reference signal, analyze the movement deviation between the two signals, and detect the tilt of the stylus pen according to the analyzed movement deviation. Here, when the inclination of the stylus pen is detected, the signal analyzing unit can recognize that the stylus pen is perpendicular to the surface of the touch panel when the calculated movement deviation is zero. Then, when detecting the inclination of the stylus pen, the signal analyzing section can recognize that the stylus pen is horizontal with respect to the surface of the touch panel, if the calculated movement deviation is the maximum value.

As described above, the present invention can accurately detect the position, the pressure and the inclination of the stylus pen and minimize the error by removing the noise of the input signal by the IQ modulation method.

FIG. 8 is a view showing the inclination of the electrode of the touch panel and the stylus pen, FIG. 9 is a view showing the structure of the stylus pen, and FIG. 10 is a view showing the LC circuit of FIG.

As shown in FIG. 9, the touch input device of the present invention may include a touch panel 10 and a stylus pen 20.

In the touch panel 10, a plurality of electrodes are arranged, and the electrostatic capacity formed between the electrodes depending on the contact or proximity of the stylus pen 20 can be varied.

The touch panel 10 includes a transparent substrate 1100, a plurality of first electrodes 1200 arranged in a first direction on the transparent substrate 1100 and a plurality of second electrodes 1200 arranged on the transparent substrate 1100 in a second And a second electrode 1300 arranged in the direction of the second electrode 1300. [

For example, the distance between the first electrodes 1200 and the distance between the second electrodes 1300 may be equal to each other. The plurality of first electrodes 1200 may be disposed at a first interval between the first electrodes 1200 located in the central region of the touch panel 10 and a second interval between the first electrodes 1200 located in the edge region of the touch panel 10 The second intervals between the first electrodes 1200 may be different from each other. A plurality of second electrodes 1300 may be disposed at a third interval between the second electrodes 1300 located in the central region of the touch panel 10 and a third interval between the second electrodes 1300 located in the edge region of the touch panel 10 And the fourth intervals between the second electrodes 1300 may be different from each other.

In another example, the number of the first electrodes 1200 and the number of the second electrodes 1300 may be equal to each other. The number of the first electrodes 1200 may be equal to the number of the first electrodes 1200 located in the central region of the touch panel 10 and the number of the first electrodes 1200 located in the edge region of the touch panel 10. [ 1200 may be different from each other. The number of the second electrodes 1300 is different from the number of the second electrodes 1300 located in the central region of the touch panel 10 and the number of the second electrodes 1300 located in the edge region of the touch panel 10 1300 may be different from each other.

In another example, the line width of the first electrode 1200 and the line width of the second electrode 1300 may be equal to each other. The plurality of first electrodes 1200 may be arranged in a line width of the first electrodes 1200 located in a central region of the touch panel 10 and a width of the first electrodes 1200 located in an edge region of the touch panel 10. [ 1200 may have different line widths. The plurality of second electrodes 1300 are arranged in a line width of the second electrodes 1300 located in the central region of the touch panel 10 and the second electrodes 1300 located in the edge region of the touch panel 10 1300) may have different line widths.

The reason why at least one of the interval, the line width, and the number of the electrodes located in the central region of the touch panel 10 and the electrodes located in the edge region of the touch panel 10 are arranged differently is that the touch panel 10 This is because the touch detection rate of the central area can be increased.

This is because the ratio of touching the central area of the touch panel to the edge area of the touch panel is larger in the user's stylus pen in consideration of user convenience. Therefore, by increasing the electrode arrangement density in the central area of the touch panel, the touch sensing can be enhanced, and the touch detection of the stylus pen can be improved.

The control unit may be electrically connected to the electrodes of the touch panel 10 to sense the change in capacitance of the touch panel 10 to detect the position and tilt angle? 1 of the stylus pen, Can be performed.

The reason why the control unit detects the tilt angle of the stylus pen is that it can perform various control functions such as line thickness, color, and shade displayed on the display screen by using the detected tilt angle.

9, the stylus pen 20 may include a body portion 2100, a pen tip 2200, and an LC circuit portion 2300. In addition, as shown in FIG. Here, the pen tip 2200 is disposed at an end of the body portion 2100, and can transmit and receive an electric signal with the touch panel. The LC circuit portion 2300 can be electrically connected to the pen tip 2200 through the internal wiring 2301 and can be seated in the body portion 2100.

10, the LC circuit portion 2300 may include an inductor 2310, a capacitor 2320, and a variable capacitor 2330. Here, the variable capacitor 2330 may be connected in parallel to the inductor 2310 and the capacitor 2320. At this time, the variable capacitor 2330 may be a variable capacitance capacitor whose capacitance varies according to the force applied to the stylus pen 20. [

In some cases, the stylus pen 20 may further include a user input button and a pressure sensor. Here, the user input button is disposed outside the body part 2100, and the pressure sensor can sense the pressure applied to the user input button, and the LC circuit part 2300 includes a pen tip 2200, And may be seated in the body portion 2100. [0064] Here, the LC circuit portion 2300 can vary the electric signal according to the pressure sensed by the pressure sensor, and can transmit the variable electric signal to the touch panel. At this time, the LC circuit portion 2300 may include a variable capacitor electrically connected to the pressure sensor, the capacitance of which is varied according to the intensity of the external pressure. In this case, the control unit senses the capacitance change of the touch panel 10, analyzes the pressure intensity applied to the user input button of the stylus pen 20, and performs a function corresponding to the analyzed pressure intensity.

As another example, the stylus pen 20 may further include a piezoelectric element. Here, the piezoelectric element can convert the pressure applied to the user input button into an electric signal. In one example, the piezoelectric element may be disposed adjacent to the pressure sensor. This is because the piezoelectric element and the pressure sensor are operated by the pressure applied to the user input button, so that the arrangement space can be minimized when the piezoelectric element and the pressure sensor are disposed adjacent to each other. The reason for disposing the piezoelectric element is that electricity can be generated by using the pressure applied to the user input button. The generated electricity charges the external or internal battery, so that the electricity can be saved and the inconvenience of charging the stylus pen from time to time can be solved.

Further, the stylus pen 20 may further include a battery and a charging socket. Here, the battery can charge the electric signal converted from the piezoelectric element, and the charge socket can electrically connect the battery and the piezoelectric element. In some cases, the battery may be disposed inside or outside.

The control unit may also generate a user notification that controls the capacitance change of the touch panel 10 when a specific event occurs, thereby vibrating the piezoelectric element of the stylus pen 20. [ For example, when a specific event occurs, the control unit senses a change in capacitance of the touch panel 10 to detect the position of the stylus pen 20, and controls the touch panel 10 corresponding to the position of the stylus pen 20, And transmits a predetermined electric signal to the piezoelectric element of the stylus pen 20. The piezoelectric element of the stylus pen 20 vibrates according to the input of the transmitted electric signal to generate a user notification.

The control unit senses the capacitance change of the touch panel 10 by the stylus pen 20 to extract a signal pattern, analyzes the signal amplitude from the extracted signal pattern, 20 can be detected. Here, when analyzing the signal amplitude from the extracted signal pattern, the control unit can recognize the position of the stylus pen at which the signal amplitude is maximum in the touch panel.

The control unit senses the capacitance change of the touch panel 10 by the stylus pen 20 to extract the signal pattern, analyzes the signal frequency from the extracted signal pattern, and outputs the signal frequency to the stylus pen 20 can be detected. Here, when analyzing the signal frequency from the extracted signal pattern, it can be analyzed that the larger the signal frequency is, the larger the pressure of the stylus pen 20 becomes, and the smaller the signal frequency is, the smaller the pressure of the stylus pen 20 becomes have.

8, the control unit senses a change in capacitance of the touch panel 10 by the stylus pen 20, extracts a signal pattern, and detects a movement deviation between the extracted signal pattern and a preset reference signal pattern And the inclination of the stylus pen 20 can be detected based on the calculated movement deviation. Here, when extracting the signal pattern, the control unit separates the electrodes of the touch panel 10 into electrode pairs each having two electrodes located on both sides of each electrode, And amplifies the difference between the two electrical signals. The control section can recognize that the stylus pen 20 is perpendicular to the surface of the touch panel 10 when the calculated movement deviation is zero when the inclination of the stylus pen 20 is detected. The control unit can recognize that the stylus pen 20 is horizontal with respect to the surface of the touch panel 10 when the computed movement deviation is a maximum value when detecting the inclination of the stylus pen 20. [ Therefore, the inclination of the stylus pen 20 can be gradially increased as the calculated movement deviation is larger, and gradially decreased as the calculated movement deviation is smaller. Here, the inclination of the stylus pen 20 may be an angle [theta] 1 between the stylus pen 20 and a vertical line perpendicular to the surface of the touch panel 10.

11 to 15 are diagrams for explaining the process of detecting the inclination of the stylus pen.

The electrodes 1200 of the touch panel may include a plurality of first electrodes arranged in the X axis direction and a second electrode arranged in the Y axis direction. For convenience of explanation, only a plurality of electrodes arranged in the X axis direction Will be described.

As shown in FIG. 10, the electrodes of the touch panel may be divided into a pair of electrodes having a pair of electrodes. For example, the pair of electrodes may be formed of a pair of the electrode 1200-2 positioned on the left side of the specific electrode 1200-1 and the electrode 1200-3 positioned on the right side. Each electrode pair is electrically connected to one differential amplifier, and the operational amplifier connected to the electrode pair can perform signal processing by amplifying a difference between two electrical signals received from two electrodes of each electrode pair.

As described above, one differential amplifier is electrically connected to a pair of electrodes having two pairs of electrodes located on both sides of each electrode. The contact point of the stylus pen is set to zero cross, To generate a symmetric signal pattern on the basis of the reference signal.

Here, among the electrodes 1200, the first electrode and the third electrode are connected to the first differential amplifier among the differential amplifiers, and the second electrode and the fourth electrode among the electrodes 1200 are connected to the differential amplifiers The second differential amplifier. That is, the electrodes 1200 adjacent to each other may be connected to different differential amplifiers.

And, the number of electrodes 1200 is greater than the number of differential amplifiers, for example, the number of electrodes may be two times greater than the number of differential amplifiers.

12, when the stylus pen 20 is brought into contact with a predetermined area of the touch panel 10, the electrostatic capacity is varied between the electrodes of the touch panel, and the electric signals generated by the electrodes of the touch panel are Signal processing is performed by a signal pattern extracting section including a differential amplifier electrically connected to the electrode pair, so that a signal pattern as shown in Fig. 12 can be generated. Here, the signal pattern may be a signal pattern in which the point of contact of the stylus pen is zero-crossed and is horizontally symmetrical with respect to the point of contact.

Such a signal pattern can be moved in accordance with the angle? Between the stylus pen 20 and the vertical line VL perpendicular to the surface of the touch panel 10, as shown in Fig.

Therefore, as shown in Fig. 14, when the movement deviation DELTA d of the signal pattern is calculated, the control section can detect the inclination of the stylus pen 20. [

For example, when the stylus pen 20 is brought into contact with a predetermined area of the touch panel 10, the electrostatic capacitance between the electrodes of the touch panel 10 is varied, and the control unit controls the electrodes of the touch panel 10, Electrode pair, and can receive an electrical signal corresponding to the variable capacitance from the separated electrode pair. Then, the control unit can process the received electric signal to generate the current signal pattern S2, and calculate the moving deviation DELTA d between the generated current signal pattern S2 and the preset reference signal pattern S1. Here, the predetermined reference signal pattern S1 is a signal pattern measured in advance at the present position of the touch panel when the inclination of the stylus pen is zero. Next, the control section can detect the inclination of the stylus pen 20 based on the calculated DELTA d. Therefore, at every position of the touch panel, signal patterns having a slope of 0 of the stylus pen can be stored in the memory unit, and a slope value corresponding to the movement deviation can be stored.

15, the control unit can recognize that the stylus pen 20 is perpendicular to the surface of the touch panel 10 when the calculated movement deviation is 0 when detecting the tilt of the stylus pen 20 have. The control unit can recognize that the stylus pen 20 is horizontal with respect to the surface of the touch panel 10 when the computed movement deviation is a maximum value when detecting the inclination of the stylus pen 20. [ Therefore, the inclination of the stylus pen 20 can be gradially increased as the calculated movement deviation is larger, and gradially decreased as the calculated movement deviation is smaller. Here, the inclination of the stylus pen 20 may be an angle &thetas; between the stylus pen 20 and the vertical line VL perpendicular to the surface of the touch panel 10. [

Further, the control unit can be calculated according to the following equation (1) when calculating the movement deviation between the current signal pattern and the preset reference signal pattern.

Equation 1

Here, p is the electrode touch point of the touch panel, r is the tilt of the stylus pen, C is the current signal intensity value corresponding to the tilt of the stylus pen at the electrode touch point point of the touch panel, and A is the preset reference signal intensity value .

16 to 19 are views showing a stylus pen according to an embodiment of the present invention.

16, the stylus pen 20 includes a body part 2100, a pen tip 2200 disposed at an end of the body part 2100 and transmitting / receiving an electric signal to / from the touch panel, a body part 2100, A pressure sensor 2500 that senses a pressure applied to the user input button 2400 and a pressure sensor 2500 that is electrically connected to the pen tip 2200 and the pressure sensor 2500, And an LC circuit portion 2300 that is seated in the frame 2100.

Here, the LC circuit portion 2300 can vary the electric signal according to the pressure sensed by the pressure sensor 2500, and can transmit the variable electric signal to the touch panel. In some cases, the LC circuit portion 2300 may include a variable capacitor electrically connected to the pressure sensor 2500, the capacitance of which is varied according to the intensity of the external pressure. In one example, the LC circuit portion 2300 may include an inductor, a capacitor, and a variable capacitor, which may be connected in parallel to the inductor and the capacitor.

Accordingly, the control unit senses a change in capacitance of the touch panel, analyzes the pressure intensity applied to the user input button 2400 of the stylus pen 20, and performs a function corresponding to the analyzed pressure intensity. For example, the control unit may perform various control functions such as line thickness, color, and shade displayed on the display screen according to the pressure intensity applied to the user input button 2400.

17, the stylus pen 20 may further include a piezoelectric element 2600 that converts the pressure applied to the user input button 2400 into an electric signal. Here, the piezoelectric element 2600 may be disposed adjacent to the pressure sensor 2500. [ This is because the piezoelectric element 2600 and the pressure sensor 2500 are operated by the pressure applied to the user input button 2400 so that when the piezoelectric element 2600 and the pressure sensor 2500 are disposed adjacent to each other, This is because space can be minimized. The reason for disposing the piezoelectric element 2600 is that electricity can be generated by using the pressure applied to the user input button 2400. [ By charging the battery 2700 inside, the generated electricity can bring about an effect of saving electricity, and it is possible to solve the inconvenience of charging the stylus pen 20 from time to time.

As another example, the stylus pen 20 may further include a battery 2700 and a charging socket 2800, as shown in Fig. Here, the battery 2700 can charge the electric signal converted from the piezoelectric element 2600, and the charging socket 2800 can electrically connect the battery 2700 and the piezoelectric element 2600. In some cases, the battery 2700 may be disposed inside or outside.

19, the control unit of the present invention controls the change in electrostatic capacitance of the touch panel 10 when a specific event occurs, thereby controlling the piezoelectric element 2600 of the stylus pen 20 You can also create a vibrating user notification. For example, when a specific event occurs, the control unit senses a change in capacitance of the touch panel 10 to detect the position of the stylus pen 20, and controls the touch panel 10 corresponding to the position of the stylus pen 20, The piezoelectric element 2600 of the stylus pen 20 is vibrated in accordance with the input of the transmitted electric signal, Can be generated.

20 and 21 are cross-sectional views showing the electrode arrangement of the touch panel according to the present invention.

As shown in FIGS. 20 and 21, in the touch panel, a plurality of electrodes are arranged, and the electrostatic capacity formed between the electrodes according to the contact or proximity of the stylus pen can be variable.

The touch panel includes a transparent substrate, a plurality of first electrodes 1200 arranged in a first direction on a transparent substrate, and a second electrode (not shown) arranged in a second direction perpendicular to the first direction on the transparent substrate .

For example, the interval between the first electrodes and the interval between the second electrodes may be equal to each other.

20, the plurality of first electrodes 1200 may include a first interval d1 between the first electrodes 1200 positioned in a central region of the touch panel, The second spacing d2 between the first electrodes 1200 may be different from each other. Here, the first spacing d1 between the first electrodes 1200 located in the central region of the touch panel may be narrower than the second spacing d2 between the first electrodes 1200 located in the edge region of the touch panel have.

In another case, the plurality of second electrodes may be arranged such that the third interval between the second electrodes located in the central region of the touch panel and the fourth interval between the second electrodes located in the edge region of the touch panel are different from each other . Here, the third gap between the second electrodes located in the central region of the touch panel may be narrower than the fourth gap between the second electrodes located in the edge region of the touch panel.

As another example, the number of the first electrodes and the number of the second electrodes may be equal to each other.

In some cases, the number of the first electrodes located in the central region of the touch panel and the number of the first electrodes located in the edge region of the touch panel may be different from each other. Here, the number of the first electrodes located in the central region of the touch panel may be greater than the number of the first electrodes located in the edge region of the touch panel.

In other cases, the number of the second electrodes located in the central region of the touch panel may be different from the number of the second electrodes located in the edge region of the touch panel. Here, the number of the second electrodes located in the central region of the touch panel may be greater than the number of the second electrodes located in the edge region of the touch panel.

As another example, the line width of the first electrode and the line width of the second electrode may be equal to each other.

21, the plurality of first electrodes 1200 may include a line width w1 of the first electrodes 1200 positioned in a central region of the touch panel and a width w1 of the first electrodes 1200 located in an edge region of the touch panel 1200 may have different line widths w2. Here, the line width w1 of the first electrodes 1200 located in the central region of the touch panel may be narrower than the line width w2 of the first electrodes 1200 located in the edge region of the touch panel.

In another case, the plurality of second electrodes may have line widths of the second electrodes positioned in the central region of the touch panel and line widths of the second electrodes positioned in the edge region of the touch panel. Here, the line width of the second electrodes located in the central region of the touch panel may be narrower than the line width of the second electrodes located in the edge region of the touch panel.

The reason why at least one of the interval, the line width, and the number of the electrodes located in the central region of the touch panel and the electrodes located in the edge region of the touch panel are arranged differently is that the touch detection rate of the central region of the touch panel can be increased Because.

This is because the ratio of touching the central area of the touch panel to the edge area of the touch panel is larger in the user's stylus pen in consideration of user convenience. Therefore, by increasing the electrode arrangement density in the central area of the touch panel, the touch sensing can be enhanced, and the touch detection of the stylus pen can be improved.

22 and 23 are flowcharts for explaining a noise removing method of the touch input device according to the present invention.

As shown in Figs. 22 and 23, the control unit of the touch input device checks whether the stylus pen touches or is close to the touch panel (S10)

When the stylus pen touches or approaches the touch panel, the control unit receives the electrical signal corresponding to the capacitance change from the electrodes of the touch panel.

Next, the control unit can amplify the signal received from the electrode of the touch panel. Here, the control unit may amplify the difference between the two electric signals received from the two electrodes of each electrode pair of the touch panel. The electrode pair of the touch panel may be an electrode pair having two pairs of electrodes positioned on both sides of each electrode.

The control unit may filter the amplified signal from the amplifying unit. (S30) Here, the control unit includes at least one high-frequency filter unit for filtering only the high-frequency signal from the amplified signal from the amplifying unit, And at least one low-frequency filter section for filtering only low-frequency signals.

Then, the control unit can multiplex the amplified and filtered signal (S40)

Then, the control unit can remove the noise of the multiplexed signal. (S50)

Here, as shown in FIG. 23, when the noise is removed, the control unit combines the multiplexed signal and the inphase input signal to generate a first signal, and outputs a quadrature input signal and a multiplexed signal (S52) Then, the control unit removes noise by filtering only the low-frequency signal from the first signal, and removes the noise by filtering only the low-frequency signal from the second signal (S54). Then, The control unit converts the first signal and the second signal from which noise has been removed into a digital signal. (S56) Next, the control unit can generate a difference signal by combining the converted first signal and the second signal. S58)

Further, the control section can detect the position, the pressure and the inclination of the stylus pen from the noise-removed signal (S60)

Here, when detecting the position, the pressure, and the tilt of the stylus pen, the control unit analyzes the amplitude of the noise-removed signal, detects the position of the stylus pen according to the analyzed signal amplitude, Analyzing the frequency, detecting the pressure of the stylus pen according to the analyzed signal frequency, comparing the noise canceled signal with the reference signal, analyzing the movement deviation between the two signals, The inclination of the pen can be detected.

Next, the control unit may perform a function corresponding to at least one of the position, the pressure, and the inclination of the detected stylus pen. (S70)

Next, the control unit confirms whether or not touch detection of the stylus pen is completed (S80), and if it is finished, the touch detection can be terminated.

In this way, the control unit can accurately detect the position, the pressure and the inclination of the stylus pen and minimize the error by removing the noise of the input signal by the IQ modulation method.

Further, the present invention separates the electrodes of the touch panel into two pairs of electrodes, which are located on both sides of each electrode, and processes the signals received therefrom, thereby easily and simply controlling the position, The inclination can be detected.

In addition, according to the present invention, a pressure sensor is disposed in the stylus pen, and additional functions can be performed according to the pressure intensity applied to the user input button of the stylus pen, thereby providing user convenience.

Further, the present invention can reduce the power consumption by disposing the pressure element in the stylus pen and converting the pressure applied to the user input button into an electric signal to supply power.

Further, according to the present invention, when a specific event occurs, a user notification that vibrates the piezoelectric element of the stylus pen is generated, thereby providing user convenience.

In addition, the present invention is characterized in that at least one of the interval, the line width, and the number of the electrodes located in the central area of the touch panel and the electrodes positioned in the edge area of the touch panel are differently arranged to increase the touch detection rate in the central area of the touch panel Thereby providing user convenience.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

The present invention described above can be embodied as computer-readable codes on a medium on which a program is recorded. The computer readable medium includes all kinds of recording devices in which data that can be read by a computer system is stored. Examples of the computer-readable medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage, and the like, and also implemented in the form of a carrier wave (for example, transmission over the Internet) . Also, the computer may include a control unit of the terminal.

Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

10: Touch panel
20: Stylus Pen
180:
190: touch input service module

Claims (10)

Stylus pen;
A touch panel in which a plurality of electrodes are arranged and capacitance formed between the electrodes varies according to contact or proximity of the stylus pen; And,
A control unit sensing a change in capacitance of the touch panel and detecting a position, a pressure and a tilt of the stylus pen, and performing a function corresponding to the position,
Wherein,
An amplifier for amplifying a signal received from the electrode of the touch panel;
A multiplexer for multiplexing a signal output from the amplifying unit;
A noise canceling unit for removing noise of a signal output from the multiplexing unit; And,
And a signal analyzer for detecting a position, a pressure, and a tilt of the stylus pen from the noise-removed signal. The apparatus according to claim 1,
Wherein the touch panel is a differential amplification unit for amplifying a difference between two electric signals received from two electrodes of each electrode pair of the touch panel. The touch panel according to claim 2,
Wherein the touch input unit is an electrode pair having two pairs of electrodes positioned on both sides of each electrode. 2. The apparatus of claim 1, wherein between the amplification unit and the multiplexing unit,
And a filter unit for filtering the amplified signal from the amplification unit. 5. The filter according to claim 4,
At least one high-frequency filter unit for filtering only a high-frequency signal from a signal amplified by the amplifying unit,
And at least one low-frequency filter unit for filtering only low-frequency signals from the filtered high-frequency signal. The apparatus according to claim 1,
A first mixer for synthesizing an inphase input signal with a signal output from the multiplexer;
A second mixer for combining a signal output from the multiplexer and a quadrature input signal;
A first low frequency filter unit for filtering only a low frequency signal from the signal output from the first mixer to remove noise;
A second low frequency filter unit for filtering only a low frequency signal from the signal output from the second mixer to remove noise;
A first analog-to-digital converter for converting the filtered signal from the first low-frequency filter unit into a digital signal;
A second analog-to-digital converter for converting the filtered signal from the second low-frequency filter unit into a digital signal; And,
And a combining unit for combining the first signal output from the first analog-to-digital conversion unit and the second signal output from the second analog-digital conversion unit to generate a difference signal. The apparatus of claim 1,
And a stylus pen for analyzing the amplitude of the noise-removed signal and detecting the position of the stylus pen according to the analyzed signal amplitude. The apparatus of claim 1,
And a stylus pen for analyzing the frequency of the noise canceled signal and detecting the pressure of the stylus pen according to the analyzed signal frequency. The apparatus of claim 1,
And comparing the noise canceled signal with a reference signal to analyze a movement deviation between the two signals and to detect a tilt of the stylus pen in accordance with the analyzed movement deviation. The stylus pen according to claim 1,
Body part;
A pen tip disposed at an end of the body portion to transmit and receive an electric signal to and from the touch panel;
A user input button disposed outside the body portion;
A pressure sensor for sensing a pressure applied to the user input button; And,
And an LC circuit part electrically connected to the pen tip and the pressure sensor and seated in the body part.

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