WO2020158980A1 - Mobile terminal - Google Patents

Abstract

Provided is a mobile terminal, and in order to form a sound by vibrating a display panel, the mobile terminal of the present invention comprises: a display; a frame that surrounds and supports the edge of the rear surface of the display; and a piezoelectric substrate that is provided on the rear surface of the display panel, and vibrates the display panel in response to an applied voltage. The present invention generates a sound effect by vibrating the display panel such that sound is not dispersed and can be emitted toward a user.

Description

Mobile terminal

The present invention relates to a mobile terminal, and specifically, it can be applied to a technical field of forming a sound by vibrating a display panel.

Terminals can be divided into mobile terminals (mobile/portable terminals) and stationary terminals according to their mobility. Again, the mobile terminal may be divided into a handheld terminal and a vehicle mounted terminal according to whether the user can directly carry it.

The functions of mobile terminals are diversifying. For example, there are functions for data and voice communication, photo and video shooting through a camera, voice recording, music file playback through a speaker system, and output of an image or video to a display. In some terminals, an electronic game play function is added or a multimedia player function is performed. In particular, recent mobile terminals can receive multicast signals that provide visual content such as broadcast and video or television programs.

As the functions are diversified, such terminals are implemented in the form of a multimedia player equipped with complex functions such as, for example, taking pictures or videos, playing music or video files, and receiving game broadcasts.

In order to support and increase the function of such a terminal, it may be considered to improve the structural part and/or software part of the terminal.

Recently, a mobile terminal uses a piezoelectric substrate to form a sound or provide a haptic effect. The piezoelectric substrate can vibrate and form a sound by using the contraction and expansion of the piezo material corresponding to the applied voltage.

2. Description of the Related Art Conventionally, a piezoelectric substrate is fixed to a frame in a mobile terminal because a vibrating substrate is required to form sound. However, when the piezoelectric substrate is fixedly provided on the frame, there is a disadvantage in that the direction of sound is distributed, and there is a disadvantage in that the degree of freedom is reduced in a positional relationship with internal components.

In addition, the piezoelectric substrate has a disadvantage in that the piezo material forms a curved surface in the process of contraction and expansion, so that an external force easily cracks.

The present invention has an object to increase the degree of freedom in the positional relationship with the internal components, the direction of the sound is concentrated toward the front by vibrating the display panel through the piezoelectric substrate. In addition, an object of the present invention is to enhance durability so that the piezoelectric substrate does not easily crack on external force.

In order to achieve the above or other object, according to an aspect of the present invention, a display panel, a frame supporting the edge of the display rear surface, and provided on the rear surface of the display panel, vibrating the display panel in response to an applied voltage It provides a mobile terminal comprising a piezoelectric substrate.

In addition, according to an aspect of the present invention, the display panel provides a mobile terminal characterized in that the back side is a plastic organic light emitting diode (Plastic-OLED) including a plastic substrate.

In addition, according to an aspect of the present invention, the piezoelectric substrate is spaced apart from the frame to provide a mobile terminal characterized in that provided in the center of the back of the plastic substrate.

In addition, according to an aspect of the present invention, the frame includes a middle frame provided opposite to the rear surface of the display panel, and the middle frame is provided at a predetermined distance apart to form a space in which the display panel can vibrate. It provides a mobile terminal characterized in that.

In addition, according to an aspect of the present invention, the middle frame provides a mobile terminal characterized in that it comprises a groove or a hole corresponding to the area where the piezoelectric substrate is provided.

In addition, according to an aspect of the present invention, the piezoelectric substrate is a piezo material layer forming a curvature in the front-rear direction corresponding to the applied voltage, a printed circuit board applying the voltage to the piezo material layer, and the piezo material layer It provides a mobile terminal characterized in that it comprises a first reinforcing plate provided on the back of the.

Further, according to an aspect of the present invention, the printed circuit board is provided at the rear end of the layer of the piezo material to form a step with the back of the layer of the piezo material, and the first reinforcing plate has a step portion corresponding to the step. It provides a mobile terminal comprising a.

In addition, according to an aspect of the present invention, the piezoelectric substrate provides a mobile terminal characterized in that it further comprises a second reinforcement plate between the piezoelectric material layer and the plastic substrate.

Further, according to an aspect of the present invention, the first reinforcing plate provides a mobile terminal characterized in that it is thicker than the second reinforcing plate.

In addition, according to an aspect of the present invention, the piezo material layer provides a mobile terminal characterized in that it comprises a front layer and a back layer having different tensile directions corresponding to the applied voltage.

In addition, according to an aspect of the present invention, the piezoelectric substrate provides a mobile terminal characterized in that it is attached to the rear surface of the display panel with a stretch tape including a handle.

In addition, according to an aspect of the present invention, the piezoelectric substrate provides a mobile terminal characterized in that it is attached to the back surface of the display panel using a non-woven tape.

The effects of the mobile terminal according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, a sound effect may be generated by vibrating the display panel.

According to at least one of the embodiments of the present invention, the sound is not distributed by vibrating the display panel, but may be emitted toward the user.

According to at least one of the embodiments of the present invention, the degree of freedom in a position where a piezoelectric substrate vibrating the display panel may be provided may be increased.

According to at least one of the embodiments of the present invention, it is possible to prevent the piezoelectric substrate from cracking due to external force.

Further scope of applicability of the present invention will become apparent from the following detailed description. However, various changes and modifications within the spirit and scope of the present invention can be clearly understood by those skilled in the art, and thus, specific embodiments such as detailed description and preferred embodiments of the present invention are understood to be given only as examples. Should be.

1A is a block diagram illustrating a mobile terminal related to the present invention.

1B and 1C are conceptual views of an example of a mobile terminal related to the present invention viewed from different directions.

2 is a view showing a schematic bonding state of a piezoelectric material layer and a printed circuit board on a piezoelectric substrate.

3 is a view for explaining the principle of the piezoelectric substrate vibrating in response to the voltage in FIG. 2.

4 is a conceptual diagram illustrating an embodiment of a piezoelectric substrate provided in a frame in order to generate sound in a conventional mobile terminal.

5 is a view for explaining an embodiment provided on the back of the display panel in order to generate sound in the mobile terminal, according to an embodiment of the present invention.

6 is a cross-sectional view taken along line A-A' in FIG. 5.

7 is a perspective view of part B of FIG. 5 when viewed from one direction.

8 is an enlarged view of a portion of a piezoelectric substrate, according to an embodiment of the present invention.

9 is a view for explaining the distribution of the external force applied to the piezoelectric substrate, according to an embodiment of the present invention.

10 is a view of a portion of the piezoelectric substrate as viewed from the side, according to an embodiment of the present invention.

11 is a view of the piezoelectric substrate viewed from the front and the rear, according to an embodiment of the present invention.

Hereinafter, exemplary embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar elements are assigned the same reference numbers regardless of the reference numerals, and overlapping descriptions thereof will be omitted. The suffixes "modules" and "parts" for components used in the following description are given or mixed only considering the ease of writing the specification, and do not have meanings or roles distinguished from each other in themselves. In addition, in the description of the embodiments disclosed herein, when it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed herein, detailed descriptions thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed in the specification is not limited by the accompanying drawings, and all modifications included in the spirit and technical scope of the present invention , It should be understood to include equivalents or substitutes.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from other components.

When an element is said to be "connected" or "connected" to another component, it is understood that other components may be directly connected to or connected to the other component, but there may be other components in between. It should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that no other component exists in the middle.

Singular expressions include plural expressions unless the context clearly indicates otherwise.

In this application, terms such as “comprises” or “have” are intended to indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

Mobile terminals described herein include mobile phones, smart phones, laptop computers, digital broadcasting terminals, personal digital assistants (PDAs), portable multimedia players (PMPs), navigation, and slate PCs. , Tablet PC (tablet PC), ultrabook (ultrabook), wearable device (wearable device, for example, a watch-type terminal (smartwatch), glass-type terminal (smart glass), HMD (head mounted display), etc. may be included have.

However, the configuration according to the embodiment described in the present specification can be easily recognized by those skilled in the art that the configuration may be applied to a fixed terminal such as a digital TV, a desktop computer, and a digital signage, except when applicable only to a mobile terminal. will be.

1A to 1C, FIG. 1A is a block diagram illustrating a mobile terminal related to the present invention, and FIGS. 1B and 1C are conceptual views of an example of a mobile terminal related to the present invention viewed from different directions.

The mobile terminal 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, and a power supply unit 190 ) And the like. The components shown in FIG. 1A are not essential for implementing a mobile terminal, so the mobile terminal described herein may have more or fewer components than those listed above.

More specifically, the wireless communication unit 110 among the components, between the mobile terminal 100 and the wireless communication system, between the mobile terminal 100 and another mobile terminal 100, or the mobile terminal 100 and an external server It may include one or more modules that enable wireless communication between. In addition, the wireless communication unit 110 may include one or more modules connecting the mobile terminal 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-range communication module 114, and a location information module 115. .

The input unit 120 may include a camera 121 for inputting a video signal or a video input unit, a microphone for inputting an audio signal (microphone 122), or an audio input unit, a user input unit 123 for receiving information from a user, for example , 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 one or more sensors for sensing at least one of information in the mobile terminal, surrounding environment information surrounding the mobile terminal, and user information. For example, the sensing unit 140 includes a proximity sensor 141, an illumination sensor 142, a touch sensor, an acceleration sensor, a magnetic sensor, and gravity G-sensor, gyroscope sensor, motion sensor, RGB sensor, infrared sensor (IR sensor), fingerprint scan sensor, ultrasonic sensor , Optical sensor (e.g., camera (see 121)), microphone (see 122, battery), battery gauge, environmental sensor (e.g. barometer, hygrometer, thermometer, radioactivity sensor, Thermal sensor, gas sensor, etc.), chemical sensors (for example, electronic nose, health care sensor, biometric sensor, etc.). Meanwhile, the mobile terminal disclosed in the present specification may combine and use information sensed by at least two or more of these sensors.

The output unit 150 is for generating output related to vision, hearing, or tactile sense, and includes at least one of a display unit 151, an audio output unit 152, a hap tip module 153, and an optical output unit 154 can do. The display unit 151 may form a mutual layer structure with the touch sensor or may be integrally formed, thereby realizing a touch screen. The touch screen may function as a user input unit 123 that provides an input interface between the mobile terminal 100 and a user, and at the same time, provide an output interface between the mobile terminal 100 and the user.

The interface unit 160 serves as a passage with various types of external devices connected to the mobile terminal 100. The interface unit 160 connects a device equipped with a wired/wireless headset port, an external charger port, a wired/wireless data port, a memory card port, and an identification module. It may include at least one of a port, an audio input/output (I/O) port, a video input/output (I/O) port, and an earphone port. In the mobile terminal 100, in response to an external device being connected to the interface unit 160, appropriate control related to the connected external device may be performed.

In addition, the memory 170 stores data supporting various functions of the mobile terminal 100. The memory 170 may store a number of application programs (application programs) driven in the mobile terminal 100, data for operating the mobile terminal 100, and instructions. At least some of these applications can be downloaded from external servers via wireless communication. In addition, at least some of these application programs may exist on the mobile terminal 100 from the time of shipment for basic functions of the mobile terminal 100 (for example, an incoming call, a calling function, a message reception, and a calling function). Meanwhile, the application program may be stored in the memory 170 and installed on the mobile terminal 100 to be driven by the controller 180 to perform an operation (or function) of the mobile terminal.

The controller 180 controls the overall operation of the mobile terminal 100 in addition to the operations related to the application program. The controller 180 may provide or process appropriate information or functions to the user by processing signals, data, information, etc. input or output through the above-described components or by driving an application program stored in the memory 170.

In addition, the controller 180 may control at least some of the components described with reference to FIG. 1A in order to drive the application program stored in the memory 170. Furthermore, the controller 180 may operate by combining at least two or more of the components included in the mobile terminal 100 to operate the application program.

Under the control of the controller 180, the power supply unit 190 receives external power and internal power to supply power to each component included in the mobile terminal 100. The power supply unit 190 includes a battery, and the battery may be a built-in battery or a replaceable battery.

At least some of the components may operate in cooperation with each other to implement an operation, control, or control method of a mobile terminal according to various embodiments described below. Also, the operation, control, or control method of the mobile terminal may be implemented on the mobile terminal by driving at least one application program stored in the memory 170.

Hereinafter, before looking at various embodiments implemented through the mobile terminal 100 described above, the components listed above will be described in more detail with reference to FIG. 1A.

First, referring to the wireless communication unit 110, the broadcast reception module 111 of the wireless communication unit 110 receives a broadcast signal 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 reception modules may be provided to the mobile terminal 100 for simultaneous broadcast reception or switching of broadcast channels for at least two broadcast channels.

The mobile communication module 112 includes technical standards or communication methods for mobile communication (eg, Global System for Mobile Communication (GSM), Code Division Multi Access (CDMA), Code Division Multi Access 2000 (CDMA2000), EV -Enhanced Voice-Data Optimized or Enhanced Voice-Data Only (DO), Wideband CDMA (WCDMA), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), Long Term Evolution (LTE), LTE-A (Long Term Evolution-Advanced) transmits and receives wireless signals to and from at least one of a base station, an external terminal, and a server on a mobile communication network constructed according to (Long Term Evolution-Advanced).

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

The wireless Internet module 113 refers to a module for wireless Internet access, and may be built in or external to the mobile terminal 100. The wireless Internet module 113 is configured to transmit and receive wireless signals in a communication network according to wireless Internet technologies.

Wireless Internet technologies include, for example, WLAN (Wireless LAN), Wi-Fi (Wireless-Fidelity), Wi-Fi (Wireless Fidelity) Direct, DLNA (Digital Living Network Alliance), WiBro (Wireless Broadband), WiMAX (World) Interoperability for Microwave Access (HSDPA), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), Long Term Evolution (LTE), Long Term Evolution-Advanced (LTE-A), and the wireless Internet module ( 113) transmits and receives data according to at least one wireless Internet technology in a range including the Internet technology not listed above.

In view of the wireless Internet access through WiBro, HSDPA, HSUPA, GSM, CDMA, WCDMA, LTE, LTE-A, etc., through the mobile communication network, the wireless Internet module 113 that performs wireless Internet access through the mobile communication network ) May be understood as a type of the mobile communication module 112.

The short-range communication module 114 is for short-range communication, Bluetooth™, Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra Wideband (UWB), ZigBee, NFC (Near Field Communication), by using at least one of Wi-Fi (Wireless-Fidelity), Wi-Fi Direct, Wireless USB (Wireless Universal Serial Bus) technology, it can support short-range communication. The short-range communication module 114 may be provided between the mobile terminal 100 and the wireless communication system, between the mobile terminal 100 and another mobile terminal 100, or through the mobile terminal 100 through wireless area networks. ) And other mobile terminals (100, or an external server) is located between the network can support wireless communication. The short-range wireless communication network may be wireless personal area networks (Wireless Personal Area Networks).

Here, the other mobile terminal 100 is a wearable device (for example, a smart watch), smart glasses capable of exchanging data (or interoperable) with the mobile terminal 100 according to the present invention. (smart glass), HMD (head mounted display). The short-range communication module 114 may detect (or recognize) a wearable device capable of communicating with the mobile terminal 100 around the mobile terminal 100. Furthermore, when the sensed wearable device is a device authenticated to communicate with the mobile terminal 100 according to the present invention, the controller 180 may include at least a portion of data processed by the mobile terminal 100, and the short-range communication module ( 114) to the wearable device. Accordingly, a user of the wearable device can use data processed by the mobile terminal 100 through the wearable device. For example, according to this, the user performs a phone call through the wearable device when a call is received by the mobile terminal 100 or, when a message is received by the mobile terminal 100, the received message through the wearable device It is possible to check the message.

The location information module 115 is a module for acquiring a location (or current location) of a mobile terminal, and typical examples thereof include a Global Positioning System (GPS) module or a Wireless Fidelity (WiFi) module. For example, if the mobile terminal utilizes a GPS module, the location of the mobile terminal can be obtained using a signal sent from a GPS satellite. As another example, when the mobile terminal utilizes the Wi-Fi module, the location of the mobile terminal may be obtained based on information of a Wi-Fi module and a wireless access point (AP) that transmits or receives a wireless signal. If necessary, the location information module 115 may perform any function of other modules of the wireless communication unit 110 in order to obtain data regarding the location of the mobile terminal by substitution or additionally. The location information module 115 is a module used to acquire the location (or current location) of the mobile terminal, and is not limited to a module that directly calculates or acquires the location of the mobile terminal.

Next, the input unit 120 is for input of image information (or signals), audio information (or signals), data, or information input from a user. For input of image information, the mobile terminal 100 is one Alternatively, a plurality of cameras 121 may be provided. The camera 121 processes image frames such as still images or moving pictures obtained by an image sensor in a video call mode or a shooting mode. The processed image frame may be displayed on the display unit 151 or stored in the memory 170. Meanwhile, the plurality of cameras 121 provided in the mobile terminal 100 may be arranged to form a matrix structure, and through the camera 121 forming the matrix structure, various angles or focuses may be applied to the mobile terminal 100. A plurality of image information may be input. Also, the plurality of cameras 121 may be arranged in a stereo structure to acquire left and right images for realizing a stereoscopic image.

The microphone 122 processes external sound signals as electrical voice data. The processed voice data may be used in various ways according to a function (or a running application program) being performed by the mobile terminal 100. Meanwhile, various noise reduction algorithms for removing noise generated in the process of receiving an external sound signal may be implemented in the microphone 122.

The user input unit 123 is for receiving information from a user. When information is input through the user input unit 123, the controller 180 may control the operation of the mobile terminal 100 to correspond to the input information. . The user input unit 123 is a mechanical input means (or a mechanical key, for example, a button located on the front, rear or side of the mobile terminal 100, a dome switch, a jog wheel, Jog switch, etc.) and a touch input means. As an example, the touch-type input means is made of a virtual key, a soft key or a visual key displayed on the touch screen through software processing, or a part other than the touch screen It may be made of a touch key (touch key) disposed on. Meanwhile, the virtual key or the visual key may be displayed on the touch screen while having various forms, for example, a graphic, text, icon, video, or the like. It can be made of a combination of.

Meanwhile, the sensing unit 140 senses at least one of information in the mobile terminal, surrounding environment information surrounding the mobile terminal, and user information, and generates a sensing signal corresponding thereto. The controller 180 may control driving or operation of the mobile terminal 100 based on the sensing signal, or perform data processing, function, or operation related to an application program installed in the mobile terminal 100. The 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 or absence of an object approaching a predetermined detection surface or an object in the vicinity using mechanical force or infrared rays without mechanical contact. The proximity sensor 141 may be provided with a proximity sensor 141 in an inner region of the mobile terminal wrapped by the touch screen described above or 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 type proximity sensor, a magnetic type proximity sensor, and an infrared proximity sensor. When the touch screen is capacitive, the proximity sensor 141 may be configured to detect the proximity of the object with a change in electric field according to the proximity of the conductive object. In this case, the touch screen (or touch sensor) itself may be classified as a proximity sensor.

On the other hand, for convenience of description, the act of allowing the object to be recognized as being located on the touch screen without being touched on the touch screen is called "proximity touch", and the touch The act of actually touching an object on the screen is called "contact touch". The location where an object is touched in proximity on the touch screen refers to a location where the object is perpendicular to the touch screen when the object is touched in close proximity. The proximity sensor 141 may detect a proximity touch and a proximity touch pattern (eg, proximity touch distance, proximity touch direction, proximity touch speed, proximity touch time, proximity touch position, proximity touch movement state, etc.). have. Meanwhile, as described above, the controller 180 processes data (or information) corresponding to the proximity touch operation and the proximity touch pattern detected through the proximity sensor 141, and further, visual information corresponding to the processed data. It can be output on the touch screen. Furthermore, the controller 180 may control the mobile terminal 100 such that different operations or data (or information) are processed according to whether a touch on the same point on the touch screen is a proximity touch or a touch touch. .

The touch sensor uses a touch (or touch input) applied to the touch screen (or the display unit 151) using at least one of various touch methods such as a resistive film method, a capacitive method, an infrared method, an ultrasonic method, and a magnetic field method. Detect.

As an example, the touch sensor may be configured to convert a change in pressure applied to a specific portion of the touch screen or capacitance generated in the specific portion into an electrical input signal. The touch sensor may be configured to detect a location, an area, a pressure when a touch is touched, a capacitance when a touch object is touched on the touch screen, and the like. Here, the touch object is an object that applies a touch to the touch sensor, and may be, for example, a finger, a touch pen or a stylus pen, a pointer, and the like.

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

Meanwhile, the controller 180 may perform different controls or perform the same control according to the type of the touch object that touches the touch screen (or a touch key provided in addition to the touch screen). Whether to perform different control or the same control according to the type of the touch object, it may be determined according to the current operating state of the mobile terminal 100 or the running application program.

On the other hand, the touch sensors and proximity sensors described above are independently or in combination, such as short (or tap) touch on the touch screen, long touch, multi touch, drag touch ), flick touch, pinch-in touch, pinch-out touch, swipe touch, hovering touch, etc. You can sense the touch.

The ultrasonic sensor may recognize location information of a sensing target using ultrasonic waves. Meanwhile, the control unit 180 may calculate the position of the wave generating source through information sensed by the optical sensor and the plurality of ultrasonic sensors. The position of the wave generator can be calculated by using a property in which light is much faster than ultrasonic waves, that is, a time when light reaches the optical sensor is much faster than a time when ultrasonic waves reach the ultrasonic sensor. More specifically, the position of the wave generator may be calculated by using a time difference from the time at which the ultrasound reaches the light as a reference signal.

Meanwhile, the camera 121, which has been described as the configuration of the input unit 120, includes at least one of a camera sensor (eg, CCD, CMOS, etc.), a photo sensor (or image sensor), and a laser sensor.

The camera 121 and the laser sensor are combined with each other to detect a touch of a sensing target for a 3D stereoscopic image. The photo sensor may be stacked on a display element, which is configured to scan the movement of the sensing object close to the touch screen. More specifically, the photo sensor mounts photo diodes and TRs (transistors) in rows/columns to scan the contents placed on the photo sensor using electrical signals that change according to the amount of light applied to the photo diode. That is, the photo sensor performs coordinate calculation of the sensing object according to the amount of change of light, and through this, location information of the sensing object may be obtained.

The display unit 151 displays (outputs) information processed by the mobile terminal 100. For example, the display unit 151 may display execution screen information of an application program driven by the mobile terminal 100, or user interface (UI) or graphical user interface (GUI) information according to the execution screen information. .

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

A three-dimensional display method such as a stereoscopic method (glasses method), an auto stereoscopic method (glasses-free method), or a projection method (holographic method) may be applied to the stereoscopic display unit.

The audio 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, call mode or recording mode, voice recognition mode, broadcast reception mode, or the like. The sound output unit 152 may also output sound signals related to functions (for example, call signal reception sound, message reception sound, etc.) performed in the mobile terminal 100. The sound 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 tactile effect generated by the haptic module 153 may be vibration. The intensity and pattern of vibration generated in the haptic module 153 may be controlled by a user's selection or setting of a control unit. For example, the haptic module 153 may synthesize different vibrations and output them sequentially or sequentially.

In addition to vibration, the haptic module 153 is used for stimulation such as pin arrangement that vertically moves with respect to the contact skin surface, jet or suction power of the air through a spray or intake, grazing on the skin surface, contact with an electrode, and electrostatic force. Various tactile effects can be generated, such as the effect caused by and the effect of reproducing the feeling of cold and warm using an element capable of absorbing heat or generating heat.

The haptic module 153 may not only deliver a tactile effect through direct contact, but may also be implemented so that the user can feel the tactile effect through muscle sensations such as fingers or arms. Two or more haptic modules 153 may be provided according to a configuration aspect of the mobile terminal 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 mobile terminal 100. Examples of events occurring in the mobile terminal 100 may include receiving messages, receiving call signals, missed calls, alarms, schedule notifications, receiving emails, and receiving information through applications.

The signal output by the light output unit 154 is implemented as the mobile terminal emits light of a single color or a plurality of colors to the front or rear. The signal output may be terminated by the mobile terminal detecting the user's event confirmation.

The interface unit 160 serves as a passage with all external devices connected to the mobile terminal 100. The interface unit 160 receives data from an external device, receives power, transfers it to each component inside the mobile terminal 100, or allows data inside the mobile terminal 100 to be transmitted to the external device. For example, a wired/wireless headset port, an external charger port, a wired/wireless data port, a memory card port, a port for connecting a device equipped with an identification module An interface unit 160 may include a (port), an audio input/output (I/O) port, a video input/output (I/O) port, and an earphone port.

On the other hand, the identification module is a chip that stores various information for authenticating the usage rights of the mobile terminal 100, a user identification module (UIM), a subscriber identity module (SIM), universal user authentication It may include a module (universal subscriber identity module; USIM). The device provided with the identification module (hereinafter referred to as an'identification device') may be manufactured in a smart card format. Therefore, the identification device may be connected to the terminal 100 through the interface unit 160.

In addition, when the mobile terminal 100 is connected to an external cradle, the interface unit 160 becomes a passage through which power from the cradle is supplied to the mobile terminal 100 or is input by the user from the cradle. Various command signals may be passages to the mobile terminal 100. Various command signals or power inputted from the cradle may be operated as signals for recognizing that the mobile terminal 100 is correctly mounted on the cradle.

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

The memory 170 is 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, etc.), random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read (EPMROM) It may include a storage medium of at least one type of -only memory (PROM), programmable read-only memory (PROM), magnetic memory, magnetic disk and optical disk. The mobile terminal 100 may be operated in connection with a web storage performing a storage function of the memory 170 on the Internet.

Meanwhile, as described above, the controller 180 controls the operation related to the application program and the overall operation of the mobile terminal 100 in general. For example, if the state of the mobile terminal satisfies a set condition, the controller 180 may execute or release a lock state that limits the input of a user's control command to applications.

In addition, the controller 180 performs control and processing related to voice calls, data communication, video calls, etc., or performs pattern recognition processing to recognize handwriting input or picture drawing inputs performed on a touch screen as text and images, respectively. Can. Furthermore, in order to implement various embodiments described below on the mobile terminal 100 according to the present invention, the controller 180 may control any one or a combination of the above-described components.

The power supply unit 190 receives external power and internal power under the control of the controller 180 and supplies power required for the operation of each component. The power supply unit 190 includes a battery, and the battery can be a built-in battery made to be rechargeable, and can be detachably coupled to the terminal body for charging and 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 to which an external charger that supplies power for charging the battery is electrically connected.

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

Meanwhile, various embodiments below may be implemented in a recording medium readable by a computer or a similar device using, for example, software, hardware, or a combination thereof.

1B and 1C, the disclosed mobile terminal 100 has a bar-shaped terminal body. However, the present invention is not limited to this, and may be applied to various structures such as a watch type, a clip type, a glass type, or a folder type, a flip type, a slide type, a swing type, a swivel type to which two or more bodies are movably coupled. . It will be related to a specific type of mobile terminal, but the description of a specific type of mobile terminal can be generally applied to other types of mobile terminals.

Here, the terminal body may be understood as a concept of referring to the mobile terminal 100 as at least one aggregate.

The mobile terminal 100 includes a case (for example, a frame, a housing, a cover, etc.) forming an exterior. As illustrated, the mobile terminal 100 may include a front case 101 and a rear case 102. Various electronic components are disposed in the inner space formed by the combination of the front case 101 and the rear case 102. At least one middle case may be additionally disposed between the front case 101 and the rear case 102.

As illustrated, recently, a mobile terminal having a structure in which a window 151a located on the front of the display unit covers the entire front surface and omits the front case has been released, and has a side case 210 in a form surrounding the side circumference. You may. The window 151a, the side case 210 and the rear case 102 form an interior space, and in some cases, electronic components may be mounted on the rear case 102 as well. Electronic components that can be mounted on the rear case 102 include a removable battery, an identification module, and a memory card. In this case, a rear cover for covering the mounted electronic component may be detachably coupled to the rear case 102. Accordingly, when the rear cover is separated from the rear case 102, electronic components mounted on the rear case 102 are exposed to the outside.

These cases 102 and 210 may be formed by injection of synthetic resin or may be formed of metal, for example, stainless steel (STS), aluminum (Al), titanium (Ti), or the like.

The side case 210 of the present invention includes a metal material, and the side case 210 can be used as an antenna radiator. It is necessary to use a conductive material having a length suitable for the frequency characteristics of the signals to be transmitted and received, and a plurality of conductive members are formed by dividing the slit 220 in the middle of the side case 210 of a metal material, and the non-metal in the slit 220 Filled with a material, the conductive member can be used as an antenna emitter.

The mobile terminal 100 may be configured such that one case provides the inner space, unlike the above example in which a plurality of cases provide an inner space accommodating various electronic components. In this case, the mobile terminal 100 of a uni-body in which synthetic resin or metal extends from the side to the rear may be implemented.

On the other hand, the mobile terminal 100 may be provided with a waterproof portion (not shown) to prevent water from entering the terminal body. For example, the waterproof portion is provided between the window 151a and the front case 101, between the front case 101 and the rear case 102, or between the rear case 102 and the rear cover 103, the combination thereof It may include a waterproof member for sealing the interior space of the city.

The mobile terminal 100 includes a display unit 151, first and second sound output units 152a and 152b, a proximity sensor 141, an illuminance sensor 142, a light output unit 154, the first and second units Cameras 121a and 121b, first and second operation units 123a and 123b, a microphone 122, and an interface unit 160 may be provided.

Hereinafter, as illustrated in FIGS. 1B and 1C, a display unit 151, a first sound output unit 152a, a proximity sensor 141, an illuminance sensor 142, and an optical output unit are provided on the front surface of the terminal body. 154), the first camera (121a) and the first operation unit (123a) is disposed, the second operation unit (123b), the microphone 122 and the interface unit 160 are disposed on the side of the terminal body, the terminal body The mobile terminal 100 in which the second sound output unit 152b and the second camera 121b are disposed on the rear surface of the mobile terminal 100 will be described as an example.

However, these configurations are not limited to this arrangement. These configurations may be excluded or replaced as necessary, or may be disposed on different sides. For example, the first operation unit 123a may not be provided on the front of the terminal body, and the second sound output unit 152b may be provided on the side of the terminal body rather than the rear of the terminal body.

The display unit 151 displays (outputs) information processed by the mobile terminal 100. For example, the display unit 151 may display execution screen information of an application program driven by the mobile terminal 100, or user interface (UI) or graphical user interface (GUI) information according to the execution screen information. .

The display unit 151 includes a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), and a flexible display (flexible). display), a three-dimensional display (3D display), an electronic ink display (e-ink display).

Also, two or more display units 151 may be present depending on the implementation form of the mobile terminal 100. In this case, a plurality of display units may be spaced apart from one surface or integrally disposed in the mobile terminal 100, or may be respectively disposed on different surfaces.

The display unit 151 may include a touch sensor that senses a touch on the display unit 151 so that a control command can be input by a touch method. Using this, when a touch is made to the display unit 151, the touch sensor detects the touch, and the controller 180 can be configured to generate a control command corresponding to the touch based on the touch. The content input by the touch method may be a letter or a number, or an instruction or designable menu item in various modes.

On the other hand, the touch sensor is composed of a film having a touch pattern, is disposed between the display (not shown) on the back surface of the window 151a and the window 151a, or a metal wire that is directly patterned on the back surface of the window 151a. It can be. Alternatively, the touch sensor may be integrally formed with the display. For example, the touch sensor may be disposed on the substrate of the display, or may be provided inside the display.

As such, the display unit 151 may form a touch screen together with a touch sensor, and in this case, the touch screen may function as a user input unit 123 (see FIG. 1A ). In some cases, the touch screen may replace at least some functions of the first operation unit 123a.

The first sound output unit 152a may be implemented as a receiver that delivers a call sound to the user's ear, and the second sound output unit 152b is a loud speaker that outputs various alarm sounds or multimedia playback sounds. ).

An acoustic hole for emitting sound generated from the first sound output unit 152a may be formed in the window 151a of the display unit 151. However, the present invention is not limited thereto, and the sound may be configured to be emitted along an assembly gap between structures (for example, a gap between the window 151a and the front case 101). In this case, the appearance of the mobile terminal 100 can be made simpler because the holes formed independently for the sound output are not visible or hidden.

The light output unit 154 is configured to output light to notify when an event occurs. Examples of the event include message reception, call signal reception, missed calls, alarm, schedule notification, email reception, information reception through an application, and the like. The control unit 180 may control the light output unit 154 so that the output of light is terminated when the user's event confirmation is detected.

The first camera 121a processes an image frame of a still image or video obtained by an image sensor in a shooting mode or a video call mode. The processed image frame may be displayed on the display unit 151, and may be stored in the memory 170.

The first and second operation units 123a and 123b are examples of the user input unit 123 operated to receive a command for controlling the operation of the mobile terminal 100, and may also be collectively referred to as a manipulating portion. have. The first and second manipulation units 123a and 123b may be employed in any manner as long as the user operates the device while receiving a tactile feeling, such as touch, push, scroll. Also, the first and second manipulation units 123a and 123b may be employed in such a way that the user operates without a tactile feeling through a proximity touch, a hovering touch, or the like.

In this figure, the first operation unit 123a is illustrated as a touch key, but the present invention is not limited thereto. For example, the first operation unit 123a may be a mechanical key or a combination of a touch key and a push key.

Contents input by the first and second operation units 123a and 123b may be variously set. For example, the first operation unit 123a receives commands such as a menu, home key, cancel, search, etc., and the second operation unit 123b is output from the first or second sound output units 152a, 152b. Commands such as adjusting the volume of the sound and switching to the touch recognition mode of the display unit 151 may be received.

Meanwhile, as another example of the user input unit 123 on the rear surface of the terminal body, a rear input unit 123c may be provided. The rear input unit 123c is operated to receive a command for controlling the operation of the mobile terminal 100, and the input content may be variously set. For example, commands such as power on/off, start, end, scroll, etc., control the volume of sound output from the first and second sound output units 152a, 152b, and touch recognition mode of the display unit 151. You can receive commands such as conversion of. The rear input unit 123c may be implemented in a form capable of input by touch input, push input, or a combination thereof.

The rear input unit 123c may be disposed to overlap the front display unit 151 in the thickness direction of the terminal body. For example, when the user holds the terminal body with one hand, the rear input unit 123c may be disposed at the rear upper end of the terminal body so that it can be easily operated using the index finger. However, the present invention is not necessarily limited to this, and the position of the rear input unit may be changed.

When the rear input unit 123c is provided on the rear surface of the terminal body, a new type of user interface using the rear input unit 123c may be implemented. In addition, when the touch screen or the rear input unit described above replaces at least some functions of the first operation unit 123a provided on the front surface of the terminal body, when the first operation unit 123a is not disposed on the front surface of the terminal body, The display unit 151 may be configured as a larger screen.

Meanwhile, the mobile terminal 100 may be provided with a fingerprint recognition sensor for recognizing a user's fingerprint, and the controller 180 may use fingerprint information detected through the fingerprint recognition sensor as an authentication means. The fingerprint recognition sensor may be embedded in the display unit 151 or the user input unit 123.

The microphone 122 is configured to receive a user's voice, other sounds, and the like. The microphone 122 may be provided at a plurality of locations and configured to receive stereo sound.

The interface unit 160 is a passage through which the mobile terminal 100 can be connected to an external device. For example, the interface unit 160 is a connection terminal for connection with other devices (eg, earphones, external speakers), a port for short-range communication (for example, an infrared port (IrDA Port), a Bluetooth port (Bluetooth) Port, Wireless LAN Port, etc.], or at least one of a power supply terminal for supplying power to the mobile terminal 100. The interface unit 160 may be implemented in the form of a socket that accommodates an external card such as a subscriber identification module (SIM) or a user identity module (UIM) or a memory card for storing information.

A second camera 121b may be disposed on the rear side of the terminal body. In this case, the second camera 121b has a shooting direction substantially opposite to the first camera 121a.

The second camera 121b may include a plurality of lenses arranged along at least one line. The plurality of lenses may be arranged in a matrix format. Such a camera may be referred to as an'array camera'. When the second camera 121b is configured as an array camera, images may be captured in a variety of ways using a plurality of lenses, and better quality images may be obtained.

The flash 124 may be disposed adjacent to the second camera 121b. When the flash 124 photographs the subject with the second camera 121b, light is directed toward the subject.

A second sound output unit 152b may be additionally disposed on the terminal body. The second sound output unit 152b may implement a stereo function together with the first sound output unit 152a, or may be used to implement a speakerphone mode during a call.

The terminal body may be provided with at least one antenna for wireless communication. The antenna may be built in the terminal body or may be formed in the case. For example, the antenna forming part of the broadcast receiving module 111 (see FIG. 1A) may be configured to be pulled out from the terminal body. Alternatively, the antenna may be formed of a film type and attached to the inner surface of the rear cover 103, or a case including a conductive material may be configured to function as an antenna.

The terminal body is provided with a power supply unit 190 (see FIG. 1A) for supplying power to the mobile terminal 100. The power supply unit 190 may include a battery 191 built in the terminal body or configured to be detachable from the outside of the terminal body.

The battery 191 may be configured to receive power through a power cable connected to the interface unit 160. Also, the battery 191 may be configured to be wirelessly charged through a wireless charger. The wireless charging may be implemented by a magnetic induction method or a resonance method (magnetic resonance method).

On the other hand, in this figure, the rear cover 103 is coupled to the rear case 102 so as to cover the battery 191 to limit the detachment of the battery 191, and configured to protect the battery 191 from external shocks and foreign matter. For example. When the battery 191 is configured to be detachably attached to the terminal body, the rear cover 103 may be detachably coupled to the rear case 102.

An accessory that protects the appearance or assists or expands the function of the mobile terminal 100 may be added to the mobile terminal 100. An example of such an accessory is a cover or pouch that covers or accommodates at least one surface of the mobile terminal 100. The cover or pouch may be configured to expand the function of the mobile terminal 100 in conjunction with the display unit 151. Another example of an accessory is a touch pen for assisting or expanding a touch input to a touch screen.

Hereinafter, exemplary embodiments related to a control method that may be implemented in the mobile terminal configured as described above will be described with reference to the accompanying drawings. 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 and essential features of the present invention.

Recently, as the demand for a front display increases, the mobile terminal 100 omits a component that needs to be disposed on the front side or replaces it using a display panel. For example, in the past, a physical input key was provided on the front surface of the mobile terminal 100, but this is replaced with a display touch input.

In addition, recently, the first acoustic output unit 152a shown in FIG. 1B is omitted to provide a wider front display, and a piezoelectric substrate is used for this purpose.

2 is a view showing a schematic bonding state of a piezoelectric material layer and a printed circuit board on a piezoelectric substrate. 3 is a view for explaining the principle of the piezoelectric substrate vibrating in response to the voltage in FIG. 2.

The piezoelectric substrate according to the present invention may generate driving through repetition of contraction and/or expansion deformation of the piezo material layer 200 according to a power applied from the printed circuit board 300.

The piezo material layer 200 alternately prints the patterns of the inner electrodes 211 and 212 designed in a desired shape for a thin molded sheet, and stacks each sheet on which the inner electrodes 211 and 212 are printed in a multi-layer type. The laminate is fired and integrated into a single body.

The piezo material layer 200 has external electrodes 221 and 222 at both ends. The external electrodes 221 and 222 are fixedly mounted by being electrically connected to each terminal terminal of the printed circuit board 300 through a conductive adhesive 400.

The piezo material layer 200 may reversely form a polarization direction in an upper layer and a lower layer in response to a voltage applied through an electrode. The upper layer and the lower side in which the polarization direction is reversed may expand and contract or contract and expand in the longitudinal direction, respectively, and vibrate in the front-rear direction as shown in FIGS. 3(a) and 3(b).

When attached to a rigid substrate, the piezoelectric substrate can generate sound corresponding thereto by vibrating the substrate. That is, in order to form a sound through the piezoelectric substrate, the object of tremor must have a certain hardness.

4 is a conceptual diagram illustrating an embodiment of a piezoelectric substrate provided in a frame in order to generate sound in a conventional mobile terminal.

Conventionally, a piezoelectric substrate is provided on the frame, and the frame is vibrated to generate sound. Looking at an embodiment in which a sound is generated through a piezoelectric substrate in a conventional mobile terminal is as follows.

When the cantilever beam 420 fixed to the frame 410 of the mobile terminal vibrates through the piezoelectric substrate 430, the frame 410 vibrates in response to the cantilever beam 420 and generates a sound corresponding thereto.

The cantilever 420 is fixed to the frame 410 through a screw 421 to transmit vibration to the frame 410.

In some cases, the cantilever beam 420 may include a metal 422 at the end to compensate for the high-frequency range.

The frame 410 may include a middle frame provided between the display panel 440 provided on the front side and the rear cover 450, and form a side appearance of the mobile terminal.

When the frame 410 is vibrated and radiates sound according to a conventional method, the sound may be distributed in a lateral direction rather than a front direction. In this case, the sound pressure at which sound is transmitted to the user may be weak, and the sound generated by the mobile terminal may act as noise to people around them.

Accordingly, the present invention is to provide a piezoelectric substrate 430 on the back surface of the display panel 440, to present a technical idea of emitting the sound to the front by vibrating the display panel 400.

5 is a view for explaining an embodiment provided on the back of the display panel in order to generate sound in the mobile terminal, according to an embodiment of the present invention. 6 is a cross-sectional view taken along line A-A' in FIG. 5.

In the present invention, the rear edge of the display panel 520 is supported by the frame 530, and sound can be emitted to the front through the piezoelectric substrate 510 provided on the rear surface of the display panel 520. That is, the piezoelectric substrate 510 according to the present invention may generate sound by vibrating the display panel 520.

The frame 530 forms a side appearance of the mobile terminal, and in some cases, may include a middle frame facing the back of the display.

The frame 530 may be provided to be spaced apart from the display panel 520 by a predetermined distance 532 to form a space where the display panel 520 can vibrate. That is, the middle frame facing the display rear surface may be provided spaced apart from the rear display surface at a predetermined distance 532.

In addition, in order to prevent the thickness of the mobile terminal from increasing, the frame 530 may include a hole 531 or a groove 531 in an area corresponding to the piezoelectric substrate 510.

Conventionally, the reason why the piezoelectric substrate 510 is not provided on the rear surface of the display panel 520 is that the display panel 520 cannot serve as a substrate for generating sound by vibration of the piezoelectric substrate 510.

Accordingly, the present invention is to configure the display panel 520 with plastic organic light-emitting diodes (Plastic-OLED), so that the display panel 520 can serve as a substrate for generating sound by vibrating the piezoelectric substrate 510. Can.

That is, the plastic substrate forming the rear surface of the display panel 520 serves as a substrate for generating sound by vibration of the piezoelectric substrate 510.

The piezoelectric substrate 510 according to the present invention can be freely provided on the rear surface of the display panel 520, so that the position need not be limited to the vicinity of the edge of the mobile terminal as in the prior art. Therefore, the present invention can prevent the positional freedom of the internal parts of the mobile terminal from falling, while the piezoelectric substrate 510 is provided.

7 is a perspective view of part B of FIG. 5 when viewed from one direction.

The piezoelectric substrate 510 according to the present invention includes a piezo material layer 511 that forms a curvature in the front-rear direction in response to an applied voltage and a printed circuit board 512 that applies a voltage to the piezo material layer 511. Can.

However, since the piezo material layer 511 forms a curvature in the front-rear direction in response to the applied voltage as shown in FIG. 3, external force transmitted from the outside may cause the piezo material layer 511 to crack. Can. For example, when a user drops a mobile terminal during a call, the piezo material layer 511 may be broken by adding a force and an external force forming a curvature.

Therefore, the present invention may include a first reinforcement plate 513 on the back surface of the piezo material layer 511 to reinforce the piezo material layer 511. The first reinforcing plate 513 may prevent cracks from occurring in the central portion due to concentration of force in the central portion as both ends of the piezo material layer 511 are bent toward the central portion.

8 is an enlarged view of a portion of a piezoelectric substrate, according to an embodiment of the present invention.

The first reinforcing plate 513 may include a step portion 513a corresponding to a step formed with the back surface of the piezo material layer 511 as the printed circuit board 512 is attached to the piezo material layer 511. .

The printed circuit board 512 may be attached to the rear end of the piezo material layer 511 as illustrated in FIG. 1. In this case, the printed circuit board 512 forms a level difference by the thickness of the back surface of the piezo material layer 511 and the printed circuit board 512.

When the first reinforcing plate 513 is attached to the back surface of the piezo material layer 511 except for the portion where the printed circuit board 512 is attached, the force to bend the piezo material layer 511 is the printed circuit board 512 ) And the back surface of the piezo material layer 511 may be concentrated in a stepped portion formed, and cracks may occur in the corresponding portion.

Therefore, the first reinforcing plate 513 according to the present invention is preferably provided on the entire rear surface of the piezo material layer 511 by having a step portion 513a.

9 is a view for explaining the distribution of the external force applied to the piezoelectric substrate, according to an embodiment of the present invention.

Specifically, as shown in Figure 9 (a), the first reinforcing plate 513 is provided on the back surface of the piezo material layer 511 except for the portion where the printed circuit board 512 is attached to the piezo material layer 511 , It can be seen that the external force is concentrated on the boundary portion C of the printed circuit board 512 and the piezo material layer 511.

Therefore, when the first reinforcing plate 513 is provided on the entire rear surface of the piezo material layer 511, including the step portion 153a, as shown in FIG. 9(b), the external force is a specific portion of the piezo material layer 511 You can avoid being focused on.

10 is a view of a portion of the piezoelectric substrate as viewed from the side, according to an embodiment of the present invention.

Looking at the side including the step portion 513a in the piezoelectric substrate 510 of the present invention, as shown in FIG.

Since the printed circuit board 512 is attached to the rear end of the piezo material layer 511 to form a step, the first reinforcing plate 513 includes a step portion 153a corresponding to the piezo material layer 511 It may be provided to cover the entire back surface.

The first reinforcing plate 513 may maintain the attached state to the back surface of the piezo material layer 511 and the printed circuit board 513 even when the shape of the piezo material layer 511 is changed through the double-sided tape 513b.

Additionally, the first reinforcing plate 513 may include a leading edge plate 515 on the rear surface.

In addition, the present invention is provided with a second reinforcing plate 514 on the front surface of the piezo material layer 511 to further prevent the concentration of force on a specific portion of the piezo material layer 511, and to prevent pixel breakage of the display panel. Can.

The first reinforcement plate 514 is preferably provided larger than the front area of the piezo material layer 511 for the purpose of preventing pixel breakage of the display panel, and the second reinforcement plate 514 for the purpose of preventing audio performance reduction It is preferred to be thinner than.

The first reinforcing plate 514 may be attached to the back of the display panel through a double-sided tape 514a, and the piezo material layer 511 may be attached to the first reinforcing plate 514 through a double-sided tape 514b. .

The double- sided tapes 514a and 514b may be a double-sided tape based on a non-woven fabric for an audio performance advantage, or a stretch tape may be used for manufacturing advantages.

11 is a view of the piezoelectric substrate viewed from the front and the rear, according to an embodiment of the present invention.

Stretch tape is stretched in the direction perpendicular to the adhesive direction, the adhesive strength is reduced, and the attached substrate can be easily removed.

When the piezoelectric substrate 510 is attached using a stretch tape, the display panel may be prevented from being damaged when the piezoelectric substrate 510 is replaced.

Therefore, if there is a quality defect in the piezoelectric substrate 510 during the manufacturing process, it is easy to replace, and if a crack occurs in the piezoelectric substrate 510, it can be easily replaced.

To this end, the stretch tape (stretch tape 514a) may include a handle (514ab) that can be pulled in the adhesive direction and the vertical direction.

The above detailed description should not be construed as limiting in all respects, but should be considered illustrative. The scope of the invention should be determined by rational interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

Claims (12)

1. Display panel;

   A frame supporting a rear edge of the display panel; And

   A mobile terminal provided on a rear surface of the display panel and including a piezoelectric substrate that vibrates the display panel in response to an applied voltage.
2. According to claim 1,

   The display panel

   A mobile terminal characterized in that it is a plastic organic light emitting diode (Plastic-OLED) including a plastic substrate on the back.
3. According to claim 1,

   The piezoelectric substrate

   The mobile terminal is spaced apart from the frame, characterized in that provided in the central portion of the back of the plastic substrate
4. According to claim 1,

   The frame

   It includes a middle frame provided to face the back of the plastic substrate,

   The middle frame

   A mobile terminal characterized in that the display panels are spaced apart from each other so as to form a space in which the display panel can vibrate.
5. According to claim 4,

   The middle frame

   And a groove or hole corresponding to an area where the piezoelectric substrate is provided.
6. According to claim 1,

   The piezoelectric substrate

   A piezo material layer forming a curvature in the front-rear direction in response to the applied voltage;

   A printed circuit board for applying the voltage to the piezo material layer; And

   And a first reinforcing plate provided on a rear surface of the piezo material layer.
7. The method of claim 6,

   The printed circuit board

   It is provided at the rear end of the piezo material layer to form a step with the back surface of the piezo material layer,

   The first reinforcement plate

   And a step portion corresponding to the step.
8. The method of claim 7,

   The piezoelectric substrate

   And a second reinforcing plate between the piezo material layer and the plastic substrate.
9. The method of claim 8,

   The first reinforcement plate

   A mobile terminal characterized in that it is thicker than the second reinforcing plate.
10. The method of claim 6,

    The piezo material layer

    And a front layer and a back layer having different tensile directions corresponding to the applied voltage.
11. According to claim 1,

    The piezoelectric substrate

    Mobile terminal, characterized in that attached to the back surface of the plastic substrate with a stretch tape (stretch tape) including a handle.
12. According to claim 1,

    The piezoelectric substrate

    Mobile terminal characterized in that it is attached to the back of the plastic substrate by using a non-woven tape.

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