KR20200105617A - Display device and method for providing sound of the same - Google Patents

Abstract

A display device is provided. The display device includes: a display panel; a bracket disposed on a first surface of the display panel; and a first vibrating device disposed between the first surface of the display panel and a first surface of the bracket facing the first surface of the display panel, wherein the first vibrating device is configured to output a first sound and provide a haptic by vibrating the display panel and the bracket.

Description

DISPLAY DEVICE AND METHOD FOR PROVIDING SOUND OF THE SAME

The present invention relates to a display device.

As the information society develops, demand for a display device for displaying an image is increasing in various forms. For example, display devices are applied to various electronic devices such as smart phones, digital cameras, notebook computers, navigation systems, and smart televisions. The display device may include a display panel for displaying an image, a vibration device for providing sound, and a vibration device for providing a haptic interface to a user.

The problem to be solved by the present invention is to provide a display device capable of providing both a sound and a haptic interface using a single vibration device.

The problems of the present invention are not limited to the problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

A display device according to an exemplary embodiment for solving the above problem includes a display panel, a bracket disposed on a first surface of the display panel, and the first surface of the display panel and the first surface of the display panel. A first vibration device disposed between the first surface of the bracket is provided, and the first vibration device vibrates the display panel and the bracket to output a first sound and provide haptics.

A first surface of the first vibration device may be fixed to a first surface of the display panel, and a second surface of the first vibration device may be fixed to a first surface of the bracket.

A first adhesive member disposed between the display panel and the first vibration device, and a second adhesive member disposed between the bracket and the first vibration device may further be provided.

The bracket is provided on the first surface of the bracket, and may include a first groove overlapping the first vibration device.

A first surface of the first vibration device may be fixed to a first surface of the display panel, and a second surface of the first vibration device may be fixed to a bottom surface of the first groove.

A first adhesive member disposed between the display panel and the first vibration device, and a second adhesive member disposed between the bottom surface of the first groove and the first vibration device may be further provided.

The bracket may include a first hole overlapping the first vibration device.

It is disposed on the second surface of the first vibration device, and may include a support member for supporting the first vibration device.

The support member may overlap the first hole.

The support member may be fixed to a second surface opposite to the first surface of the bracket by using a fixing member.

The support member may be disposed on at least one side of the first vibration device.

The support member may be fixed to the sidewall of the first hole of the bracket by using a fixing member.

The support member may be disposed on the first surface of the bracket.

The support member may be fixed to the first surface of the bracket using a fixing member.

A display device according to an exemplary embodiment for solving the above problem includes a display panel, a bracket disposed on a first surface of the display panel, and the bracket facing the first surface of the display panel and the first surface of the display panel. A first vibration device disposed between the first surfaces of the display panel, and a second vibration device disposed on the first surface of the display panel, wherein the first vibration device outputs a first sound and provides a haptic. The display panel and the bracket are vibrated, and the second vibration device vibrates the display panel to output a second sound.

A first surface of the first vibration device may be fixed to a first surface of the display panel, and a second surface of the first vibration device may be fixed to a first surface of the bracket.

A first adhesive member disposed between the display panel and the first vibration device, and a second adhesive member disposed between the bracket and the first vibration device may further be provided.

A gap may be provided between the second vibration device and the bracket.

A third adhesive member may be further provided between the display panel and the second vibration device.

The bracket may include a first groove overlapping the first vibration device and provided on the first surface of the bracket, and a second groove overlapping the second vibration device.

A first surface of the first vibration device is fixed to a first surface of the display panel, a second surface of the first vibration device is fixed to a bottom surface of the first groove, and a first surface of the second vibration device A surface may be fixed to the first surface of the display panel, and a gap may be provided between the second surface of the second vibration device and the bottom surface of the second groove.

The bracket may include a first groove provided on the first surface of the bracket and a second hole overlapping the second vibration device and overlapping the first vibration device.

A battery may be further provided on a second surface opposite to the first surface of the bracket, and the second hole may overlap the battery.

The bracket may include a first hole in which the first vibration device is disposed and a second hole in which the second vibration device is disposed.

It is disposed on the second surface of the first vibration device, and may include a support member for supporting the first vibration device.

The support member may overlap the first hole.

The bracket may include a first hole overlapping the first vibration device and a second hole overlapping the second vibration device.

A battery may be further provided on a second surface opposite to the first surface of the bracket, and the second hole may overlap the battery.

Details of other embodiments are included in the detailed description and drawings.

The display device according to an embodiment includes a first vibration device that is fixed to both the display panel and the bracket and vibrates the display panel and the bracket. Therefore, the first sound can be output by vibrating the display panel by the first vibration device, and the haptic can be provided by vibrating the bracket by the first vibration device. That is, it is possible to provide both a sound and a haptic interface using one vibration device.

Effects according to the embodiments are not limited by the contents illustrated above, and more various effects are included in the present specification.

1 is a perspective view illustrating a display device according to an exemplary embodiment.
2 is an exploded perspective view of a display device according to an exemplary embodiment.
3 is a bottom view illustrating an example of a display panel attached to the cover window of FIG. 2.
4 is a bottom view illustrating an example of a middle frame attached to a lower portion of the display panel of FIG. 3.
5 is a bottom view illustrating an example of a main circuit board disposed on the middle frame of FIG. 4.
6 is a cross-sectional view showing an example of I-I' of FIG. 3.
7 is a cross-sectional view showing an example of II-II' of FIG. 3.
8 is a cross-sectional view illustrating an example of Ⅲ-Ⅲ' of FIG. 3.
9 is a cross-sectional view illustrating a display area of the display panel of FIGS. 6 to 8 in detail.
10 is a cross-sectional view illustrating the first vibration device of FIGS. 7 and 8 in detail.
11 is a cross-sectional view showing in detail the second vibration device of FIGS. 6 and 8.
12 is an exemplary view showing a method of vibrating a vibration layer disposed between a first branch electrode and a second branch electrode of the second vibration device of FIG. 11.
13 is a graph showing sound pressure levels according to frequencies of a first sound output by a first vibration device, a second sound output by a second vibration device, and a sound output by a conventional speaker.
14A is a graph showing sound pressure levels according to frequencies of fundamental sounds and harmonics of a first sound output by the first vibration device when the first vibration device is fixed only on the display panel.
14B is a graph showing sound pressure levels according to frequencies of fundamental sounds and harmonics of a first sound output by the first vibration device when the first vibration device is fixed only to the bracket.
14C is a graph showing sound pressure levels according to frequencies of fundamental sounds and harmonics of a first sound output by the first vibration device when the first vibration device is fixed to both the display panel and the bracket.
FIG. 15 illustrates a distortion factor of a first sound according to frequency when the first vibration device is fixed to the display panel, the first vibration device is fixed to the bracket, and the first vibration device is fixed to both the display panel and the bracket. It is a graph showing.
16 is a bottom view illustrating an example of a middle frame attached to a lower portion of a display panel.
17 is a cross-sectional view illustrating an example of IV-IV' of FIG. 16.
18 is a bottom view illustrating an example of a middle frame attached to a lower portion of a display panel.
19 is a cross-sectional view illustrating an example of V-V' of FIG. 18.
20 is a bottom view illustrating an example of a middle frame attached to a lower portion of a display panel.
21 is a cross-sectional view illustrating an example of VI-VI' of FIG. 20.
22 is a cross-sectional view showing an example of VI-VI' of FIG. 20.
23 is a bottom view illustrating an example of a middle frame attached to a lower portion of a display panel.
24 is a cross-sectional view showing an example of VII-VII' of FIG. 23.
25 is a flowchart illustrating an acoustic mode and a haptic mode of a display device according to an exemplary embodiment.
26 and 27 are exemplary diagrams showing sound output according to 3D coordinates of a display device in a call mode.
28 is a bottom view illustrating an example of a display panel attached to the cover window of FIG. 2.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments make the disclosure of the present invention complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have it, and the invention is only defined by the scope of the claims.

When elements or layers are referred to as “on” of another element or layer, it includes all cases where another layer or other element is interposed directly on or in the middle of another element. The same reference numerals refer to the same components throughout the specification. The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for describing the embodiments are exemplary, and the present invention is not limited to the illustrated matters.

Although the first, second, and the like are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are only used to distinguish one component from another component. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical idea of the present invention.

Each of the features of the various embodiments of the present invention can be partially or entirely combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments can be implemented independently of each other or can be implemented together in a related relationship. May be.

1 is a perspective view illustrating a display device according to an exemplary embodiment. 2 is an exploded perspective view of a display device according to an exemplary embodiment.

1 and 2, a display device 10 according to an exemplary embodiment includes a cover window 100, a display panel 300, a display circuit board 310, a display driving circuit 320, and a flexible film 390. ), a vibration device 510, a bracket 600, a main circuit board 700, and a lower cover 900.

In the present specification, “upper” refers to a direction in which the cover window 100 is arranged with respect to the display panel 300, that is, in the Z-axis direction, and “lower” refers to the bracket 600 with respect to the display panel 300. It indicates the direction in which it is arranged, that is, the direction opposite to the Z-axis direction. In addition, “left”, “right”, “top”, and “bottom” indicate directions when the display panel 300 is viewed from a plane. For example, “Left” refers to the opposite direction of the X-axis direction, “Right” refers to the X-axis direction, “Up” refers to the Z-axis direction, and “Bottom” refers to the opposite direction of the Z-axis direction.

The display device 10 may have a rectangular shape on a plane. For example, the display device 10 may have a rectangular planar shape having a short side in a first direction (X-axis direction) and a long side in a second direction (Y-axis direction) as shown in FIGS. 1 and 2. A corner where the short side in the first direction (X-axis direction) and the long side in the second direction (Y-axis direction) meet may be rounded to have a predetermined curvature or may be formed at a right angle. The planar shape of the display device 10 is not limited to a rectangle, and may be formed in a different polygon, circle, or ellipse.

The display device 10 may include a first area DR1 formed to be flat and a second area DR2 extending from left and right sides of the first area DR1. The second region DR2 may be formed to be flat or curved. When the second region DR2 is formed flat, an angle formed between the first region DR1 and the second region DR2 may be an obtuse angle. When the second region DR2 is formed as a curved surface, it may have a constant curvature or a varying curvature.

1 illustrates that the second region DR2 extends from each of the left and right sides of the first region DR1, but is not limited thereto. That is, the second area DR2 may extend only on one of the left and right sides of the first area DR1. Alternatively, the second area DR2 may extend in at least one of the upper and lower sides as well as the left and right sides of the first area DR1. Hereinafter, a description will be made focusing on the second area DR2 disposed on the left and right edges of the display device 10.

The cover window 100 may be disposed on the display panel 300 to cover the upper surface of the display panel 300. Accordingly, the cover window 100 may function to protect the upper surface of the display panel 300.

The cover window 100 may include a transmission portion DA100 corresponding to the display panel 300 and a light blocking portion NDA100 corresponding to an area other than the display panel 300. The cover window 100 may be disposed in the first area DR1 and the second area DR2. The transmission part DA100 may be disposed in a part of the first region DR1 and a part of the second region DR2. The light blocking portion NDA100 may be formed to be opaque. Alternatively, the light blocking unit NDA100 may be formed as a decor layer on which a pattern that can be shown to a user when an image is not displayed.

The display panel 300 may be disposed under the cover window 100. The display panel 300 may be disposed to overlap with the transparent portion DA100 of the cover window 100. The display panel 300 may be disposed in the first area DR1 and the second area DR2. For this reason, the image of the display panel 300 may be viewed in not only the first area DR1 but also the second areas DR2.

The display panel 300 may be a light emitting display panel including a light emitting element. For example, the display panel 300 includes an organic light emitting display panel using an organic light emitting diode including an organic light emitting layer, a micro light emitting diode display panel using a micro LED, and a quantum dot emission layer. It may be a quantum dot light emitting display panel using an included quantum dot light emitting diode (Quantum dot Light Emitting Diode), or an inorganic light emitting display panel using an inorganic light emitting device including an inorganic semiconductor. Hereinafter, a description will be made focusing on that the display panel 300 is an organic light emitting display panel.

A display circuit board 310 and a display driving circuit 320 may be attached to one side of the display panel 300. One end of the display circuit board 310 may be attached on pads provided on one side of the display panel 300 using an anisotropic conductive film. The display circuit board 310 includes a flexible printed circuit board that can be bent, a rigid printed circuit board that is hard to bend, or a rigid printed circuit board and a flexible printed circuit board. It may be a composite printed circuit board including all.

The display driving circuit 320 receives control signals and power voltages through the display circuit board 310, generates and outputs signals and voltages for driving the display panel 300. The display driving circuit 320 may be formed as an integrated circuit and attached on the display panel 300 by a chip on glass (COG) method, a chip on plastic (COP) method, or an ultrasonic method, but is not limited thereto. For example, the display driving circuit 320 may be attached on the display circuit board 310.

A touch driving circuit 330 may be disposed on the display circuit board 310. The touch driving circuit 330 may be formed as an integrated circuit and attached to the upper surface of the display circuit board 310. The touch driving circuit 330 may be electrically connected to the touch electrodes of the touch sensor layer of the display panel 300 through the display circuit board 310. The touch driving circuit 330 applies touch driving signals to the driving electrodes among the touch electrodes, and senses the amount of change in charge of capacitances between the driving electrodes and the sensing electrodes through the sensing electrodes among the touch electrodes. Touch data including touch coordinates may be output.

A first vibration driving circuit 340 and a second vibration driving circuit 350 may be disposed on the display circuit board 310. The first vibration driving circuit 340 receives first vibration data from the main processor 710. The first vibration driving circuit 340 generates first and second driving voltages according to the first vibration data and outputs them to the first vibration device 510. The second vibration driving circuit 350 receives second vibration data from the main processor 710. The second vibration driving circuit 350 generates third and fourth driving voltages according to the second vibration data and outputs them to the second vibration device 520.

A power supply circuit for supplying display driving voltages for driving the display driving circuit 320 may be disposed on the display circuit board 310. Accordingly, display driving voltages for driving the display panel 300, first and second driving voltages for driving the first vibration device 510, and third driving voltages for driving the second vibration device 520 And the fourth driving voltages may be generated and supplied by different circuits, respectively. Therefore, display driving voltages for driving the display panel 300, first and second driving voltages for driving the first vibration device 510, and a third driving voltage for driving the second vibration device 520 And the fourth driving voltages can be prevented from being influenced by each other.

One side of the flexible film 390 may be attached to the upper surface of the display panel 300 from the lower side of the display panel 300 using an anisotropic conductive film. The other side of the flexible film 390 may be attached to the upper surface of the display circuit board 310 from the upper side of the display circuit board 310 using an anisotropic conductive film. The flexible film 390 may be a flexible film that can be bent.

Meanwhile, the flexible film 390 may be omitted, and the display circuit board 310 may be directly attached to one side of the display panel 300. In this case, one side of the display panel 300 may be bent toward the lower surface of the display panel 300 and disposed.

A first vibration device 510 and a second vibration device 520 may be disposed on one surface of the display panel 300. The first vibration device 510 may be a linear resonant actuator (LRA) that vibrates the display panel 110 and the bracket 600 by generating magnetic force using a voice coil according to an applied voltage. The second vibration device 520 may be a piezoelectric element or a piezoelectric actuator that vibrates the display panel 300 using a piezoelectric material that contracts or expands according to an applied voltage. .

The bracket 600 may be disposed under the display panel 300. The bracket 600 may include plastic, metal, or both plastic and metal. The bracket 600 includes a first camera hole CMH1 into which the camera device 720 is inserted, a battery hole BH in which a battery is disposed, and a cable hole through which the cable 314 connected to the display circuit board 310 passes. CAH) can be formed. In addition, a first groove GR1 overlapping the first vibration device 510 and a second groove GR2 overlapping the second vibration device 520 may be formed in the bracket 600.

The main circuit board 700 and the battery 790 may be disposed under the bracket 600. The main circuit board 700 may be a printed circuit board or a flexible printed circuit board.

The main circuit board 700 may include a main processor 710, a camera device 720, and a main connector 730. The camera device 720 is disposed on both the upper and lower surfaces of the main circuit board 700, the main processor 710 is disposed on the upper surface of the main circuit board 700, and the main connector 730 is the main circuit board 700. ) Can be placed underneath.

The main processor 710 may control all functions of the display device 10. For example, the main processor 710 may output digital video data to the display driving circuit 320 through the display circuit board 310 so that the display panel 300 displays an image. Further, the main processor 710 may receive touch data from the touch driving circuit 330 and determine the user's touch coordinates, and then execute an application indicated by an icon displayed on the user's touch coordinates.

The main processor 710 may output first vibration data to the first vibration driving circuit 340 in order to vibrate the display panel 300 and the bracket 600 by the first vibration device 510. The first vibration data generated in the acoustic mode in which the display panel 300 is vibrated by the first vibration device 510 to output the first sound and the bracket 600 is vibrated by the first vibration device 510 to generate a haptic effect. The first vibration data may be different in a haptic mode that provides a. Also, the main processor 710 may generate first vibration data to provide haptics while outputting the first sound.

The main processor 710 may output second vibration data to the second vibration driving circuit 350 in order to vibrate the display panel 300 by the second vibration device 520. The main processor 710 may be an application processor made of an integrated circuit, a central processing unit, or a system chip.

The main processor 710 may provide a haptic mode and an acoustic mode as shown in FIG. 25. The sound mode may include a mono mode and a stereo mode.

The main processor 710 may provide haptics by vibrating the display panel 300 and the bracket 600 by the first vibration device 510 in a haptic mode. The main processor 710 may vibrate the display panel 300 by the second vibration device 520 in a mono mode to output a second sound. Alternatively, the main processor 710 vibrates the display panel 300 by the second vibration device 520 in a mono mode to output a second sound in a high-pitched tone band, and the display panel ( 300) and the bracket 600 may be vibrated to output a first sound in a low-pitched tone band. The main processor 710 vibrates the display panel 300 and the bracket 600 by the first vibration device 510 in a stereo mode to output a first stereo sound as a first sound, and the second vibration device 520 By vibrating the display panel 300, a second stereo sound may be output as a second sound.

In addition, sensor(s) capable of determining 3D coordinates of the display device 10 such as a gyro sensor and/or an acceleration sensor may be disposed on the main circuit board 700. The main processor 710 may determine the degree of inclination of the display device 10 according to data input from sensor(s) capable of determining 3D coordinates of the display device 10.

The first vibration device 510 may be disposed adjacent to the lower side of the display panel 300 as shown in FIG. 28, and the second vibration device 520 may be disposed adjacent to the upper side of the display panel 300. In this case, when the display device 10 is inclined so that the first vibration device 510 is positioned higher than the second vibration device 520 as shown in FIG. 26, the main processor 710 It can be determined that is placed close to the user's ear. Accordingly, the main processor 710 may vibrate the display panel 300 and the bracket 600 by the first vibration device 510 to output a first sound.

As shown in FIG. 27, when the display device 10 is tilted so that the second vibration device 520 is positioned higher than the first vibration device 510, the main processor 710 It can be determined that it is placed close to the ear. Accordingly, the main processor 710 may vibrate the display panel 300 by the second vibration device 520 to output a second sound.

The camera device 720 processes an image frame such as a still image or a moving picture obtained by an image sensor in a camera mode and outputs it to the main processor 710.

A cable 314 passing through the cable hole CAH of the bracket 600 may be connected to the main connector 730. Accordingly, the main circuit board 700 may be electrically connected to the display circuit board 310.

In addition, the main circuit board 700 may be further equipped with a mobile communication module capable of transmitting and receiving a wireless signal with at least one of a base station, an external terminal, and a server on a mobile communication network. The wireless signal may include a voice signal, a video call signal, or various types of data according to transmission and reception of text/multimedia messages.

The battery 790 may be disposed not to overlap with the main circuit board 700 in the third direction (Z-axis direction). The battery 790 may overlap the battery hole BH of the bracket 600.

The lower cover 900 may be disposed under the main circuit board 700 and the battery 790. The lower cover 900 may be fastened to and fixed to the bracket 600. The lower cover 900 may form a lower surface of the display device 10. The lower cover 900 may include plastic, metal, or both plastic and metal.

A second camera hole CMH2 through which a lower surface of the camera device 720 is exposed may be formed in the lower cover 900. The position of the camera device 720 and the positions of the first and second camera holes CMH1 and CMH2 corresponding to the camera device 720 are not limited to the embodiment illustrated in FIG. 2.

Meanwhile, in FIGS. 1 and 2, the display device 10 outputs a first sound by the first vibration device 510 and provides a haptic while simultaneously outputting a second sound by the second vibration device 520. Although this is illustrated, it is not limited thereto. That is, in the display device 10, the second vibration device 520 may be omitted, and in this case, the first sound may be output and haptics may be provided using only the first vibration device 510.

3 is a bottom view illustrating an example of a display panel attached to the cover window of FIG. 2. 4 is a bottom view illustrating an example of a middle frame attached to a lower portion of the display panel of FIG. 3. 5 is a bottom view illustrating an example of a main circuit board disposed on the middle frame of FIG. 4.

3 to 5, a lower panel member 400 may be disposed under the display panel 300. The lower panel member 400 may be attached to the lower surface of the display panel 300 through an adhesive member. The adhesive member may be a pressure sensitive adhesive (PSA).

The lower panel member 400 includes at least one of a light absorbing member for absorbing light incident from the outside, a buffer member for absorbing shock from the outside, and a heat dissipating member for efficiently dissipating heat from the display panel 300. Can include.

The light absorbing member may be disposed under the display panel 300. The light absorbing member prevents the transmission of light and prevents components disposed under the light absorbing member, for example, the display circuit board 310, the vibration device 510, etc. from being visually recognized from the top of the display panel 300 . The light absorbing member may include a light absorbing material such as black pigment or dye.

The buffer member may be disposed under the light absorbing member. The buffer member absorbs an external impact and prevents the display panel 300 from being damaged. The buffer member may be made of a single layer or a plurality of layers. For example, the cushioning member is formed of a polymer resin such as polyurethane, polycarbonate, polypropylene, polyethylene, etc., or foam-molded rubber, urethane-based material, or acrylic-based material It may include a material having elasticity such as a sponge. The cushioning member may be a cushion layer.

The heat dissipation member may be disposed under the buffer member. The heat dissipation member may include a first heat dissipation layer including graphite or carbon nanotubes, and a second heat dissipation layer formed of a metal thin film such as copper, nickel, ferrite, or silver that can shield electromagnetic waves and has excellent thermal conductivity.

Meanwhile, the lower panel member 400 may be omitted, and in this case, a configuration disposed on the lower surface of the lower panel member 400, for example, the display circuit board 310 and the vibration device 510 It may be disposed on the lower surface of the display panel 300 instead of the lower surface of the 400 ).

The flexible film 390 attached to one side of the display panel 300 may be bent as shown in FIG. 3 and may be disposed under the lower panel member 400. Therefore, the display circuit board 310 attached to one side of the flexible film 390 may be disposed under the lower panel member 400. The display circuit board 310 may be fixed or adhered to the lower surface of the panel lower member 400 by a fixing member such as a screw or an adhesive member such as a pressure sensitive adhesive under the panel lower member 400.

The display circuit board 310 may include a first circuit board 311 and a second circuit board 312. Each of the first circuit board 311 and the second circuit board 312 may be a rigid printed circuit board or a flexible printed circuit board. When one of the first circuit board 311 and the second circuit board is a rigid printed circuit board and the other is a flexible printed circuit board, the display circuit board 310 may be a composite printed circuit board.

3 illustrates that the second circuit board 312 extends from one side of the first circuit board 311 in the second direction (Y-axis direction). The width of the second circuit board 312 in the first direction (X-axis direction) may be smaller than the width of the first circuit board 311 in the first direction (X-axis direction).

A touch driving circuit 330, a first vibration driving circuit 340, and a second vibration driving circuit 350 are disposed on one surface of the second circuit board 312, and a first connector 313 and a second vibration driving circuit 350 are disposed on the other surface. A connector 315 and a third connector 316 may be disposed. The first connector 313 may include an insertion part connected to a first connection terminal provided at one end of the cable 314. The second connector 315 may include an insertion part connected to a connection terminal provided at one end of the first flexible circuit board 560. The third connector 316 may include an insertion part connected to a connection terminal provided at one end of the second flexible circuit board 570.

The first connection terminal provided at one end of the cable 314 may be inserted into the insertion portion of the first connector 313. The second connection terminal provided at the other end of the cable 314 is bent to the bottom of the main circuit board 700 through a cable hole (CAH) penetrating the bracket 600 as shown in FIGS. 4 and 5, and the main connector 730 It can be inserted into the insertion part of the.

A first vibration device 510 may be disposed on a lower surface of the lower panel member 400. The first vibration device 510 may be attached to the lower surface of the panel lower member 400 by a first adhesive member 610 such as a pressure sensitive adhesive. Accordingly, the display panel 300 may vibrate in the thickness direction (Z-axis direction) by the first vibration device 510.

The connection terminal provided at one end of the first flexible circuit board 560 may be inserted into the insertion portion of the second connector 315. The other end of the first flexible circuit board 560 may be connected to the first vibration device 510.

The connection terminal provided at one end of the second flexible circuit board 570 may be inserted into the insertion portion of the third connector 316. The other end of the second flexible circuit board 570 may be connected to the second vibration device 520.

The bracket 600 may include a first groove GR1, a second groove GR2, a battery hole BH, a cable hole CAH, and a first camera hole CMH1.

The first groove GR1 and the second groove GR2 may be provided on the first surface of the bracket 600. The first surface of the bracket 600 may be a surface facing the lower panel member 400. The first groove GR1 and the second groove GR2 may be grooves in which the first surface of the bracket 600 is recessed. The battery hole BH, the cable hole CAH, and the first camera hole CMH1 may be holes penetrating the bracket 600.

4 illustrates that the first groove GR1 is disposed above the battery hole BH on a plane, the position of the first groove GR1 is not limited thereto. The first groove GR1 may be disposed to overlap the first vibration device 510 in the third direction (Z-axis direction). That is, since the first groove GR1 is a groove for accommodating the first vibration device 510, the position of the first groove GR1 may be changed according to the position of the first vibration device 510.

4 illustrates that the second groove GR2 is disposed between the first camera hole CMH1 and the battery hole BH on a plane, but the position of the second groove GR2 is not limited thereto. The second groove GR2 is disposed to overlap the second vibration device 520 in the third direction (Z-axis direction), and the battery hole BH, the cable hole CH, and the first camera hole CMH1 They can be arranged without overlapping. That is, since the second groove GR2 serves as a resonator of the second vibration device 520, the position of the second groove GR2 may be changed according to the position of the second vibration device 520.

Since the battery hole BH is a hole for accommodating a battery, the battery 790 may overlap the battery hole BH in the third direction (Z-axis direction) as shown in FIG. 5. The size of the battery hole BH may be larger than the size of the battery 790 as shown in FIG. 5. In addition, as shown in FIG. 4, the first flexible circuit board 560 for connecting the first vibration device 510 and the display circuit board 310 may overlap the battery hole BH in the third direction (Z-axis direction). I can.

Since the first camera hole CMH1 of the bracket 600 is a hole for accommodating the camera device 720 of the main circuit board 700, the camera device 720 is the first camera in the third direction (Z-axis direction). It may overlap with the hole CMH1.

3 to 5, the first vibration device 510 may be electrically connected to the display circuit board 310 through the first flexible circuit board 560. The second vibration device 520 may be electrically connected to the display circuit board 310 through the second flexible circuit board 570. The main circuit board 700 and the display circuit board 310 may be electrically connected to the main circuit board 700 and the display circuit board 310 through a cable 314.

6 is a cross-sectional view showing an example of Ⅰ-Ⅰ' of FIG. 3. 7 is a cross-sectional view illustrating an example of II-II' of FIG. 3. 8 is a cross-sectional view illustrating an example of Ⅲ-Ⅲ' of FIG. 3.

6 to 8, the display panel 300 may include a substrate SUB1, a pixel array layer PAL, and a polarizing film PF.

The substrate SUB1 may be a rigid substrate or a flexible substrate capable of bending, folding, rolling, or the like. The substrate SUB1 may be made of an insulating material such as glass, quartz, or polymer resin. Examples of polymeric materials include polyethersulphone (PES), polyacrylate (PA), polyarylate (PAR), polyetherimide (PEI), polyethylenenapthalate (PEN), Polyethyleneterepthalate (PET), polyphenylenesulfide (PPS), polyallylate, polyimide (PI), polycarbonate (PC), cellulose triacetate (CAT) , Cellulose acetate propionate (CAP) or a combination thereof. The substrate SUB1 may include a metal material.

The pixel array layer PAL may be disposed on the substrate SUB1. The pixel array layer PAL may be a layer that displays an image including pixels PX. The pixel array layer PAL may include a thin film transistor layer 303, a light emitting device layer 304, and a thin film encapsulation layer 305 as shown in FIG. 6.

A polarizing film PF may be disposed on the pixel array layer PAL in order to prevent a decrease in visibility due to reflection of external light. The polarizing film PF may include a linear polarizing plate and a phase delay film such as a λ/4 plate. For example, a phase delay film may be disposed on the pixel array layer PAL, and a linear polarizing plate may be disposed between the phase delay film and the cover window 100.

The lower panel member 400 may be disposed on the first surface of the display panel 300, and the cover window 100 may be disposed on the second surface opposite to the first surface. That is, the lower panel member 400 may be disposed on the lower surface of the substrate SUB1 of the display panel 300, and the cover window 100 may be disposed on the upper surface of the polarizing film PF.

One side of the flexible film 390 may be attached to one side of the substrate SUB1 and the other side may be attached to one side of the display circuit board 310. One side of the flexible film 390 may be attached to one side of the substrate SUB1 using an anisotropic conductive film. The other side of the flexible film 390 may be attached to one surface of the display circuit board 310 using an anisotropic conductive film. The other surface of the display circuit board 310 that is opposite to one surface of the display circuit board 310 may face the lower panel member 400.

5 illustrates that the display driving circuit 320 is disposed on one surface of the flexible film 390, but is not limited thereto. The display driving circuit 320 may be disposed on the other surface of the flexible film 390 that is opposite to one surface. The other surface of the flexible film 390 may be a surface attached to one surface of the substrate SUB1 and one surface of the display circuit board 310.

A display circuit board 310 may be disposed on a lower surface of the lower panel member 400. The display circuit board 310 may be fixed to the lower surface of the panel lower member 400 by a fixing member such as a screw.

The touch driving circuit 330, the first vibration driving circuit 340, and the second vibration driving circuit 350 may be disposed on one surface of the display circuit board 310. The first connector 313, the second connector 315, and the third connector 316 may be disposed on the other surface of the display circuit board 310.

The first vibration device 510 may be disposed between the lower panel member 400 and the bracket 600. A first surface of the first vibration device 510 is attached to the lower panel member 400 by a first adhesive member 610, and a second surface of the first vibration device 510 is a second adhesive member 620. It may be attached to the bracket 600 by. Specifically, the second surface of the first vibration device 510 may be attached to the bottom surface of the first groove GR1 of the bracket 600 by the second adhesive member 620.

The first vibration device 510 may be fixed to the lower panel member 400 and the bracket 600. Therefore, the display panel 300 and the bracket 600 may vibrate due to the vibration of the first vibration device 510. That is, the first vibration device 510 may vibrate the display panel 300 and the bracket 600 to output a first sound and provide haptics. The first adhesive member 610 and the second adhesive member 620 may be pressure sensitive adhesives.

A first flexible circuit board 560 may be attached to the second surface of the first vibration device 510. The second adhesive member 620 may not overlap the first flexible circuit board 560 in the third direction (Z-axis direction) as shown in FIGS. 7 and 8. Alternatively, the second adhesive member 620 may be disposed on the first flexible circuit board 560 attached to the second surface of the first vibration device 510.

The second vibration device 520 may be disposed between the lower panel member 400 and the bracket 600. The first surface of the second vibration device 520 may be attached to the lower panel member 400 by the third adhesive member 630. The second vibration device 520 may be fixed to the lower panel member 400. Therefore, the display panel 300 may vibrate by the vibration of the second vibration device 520. That is, the second vibration device 520 may vibrate the display panel 300 to output a second sound. The third adhesive member 630 may be a pressure sensitive adhesive.

A second flexible circuit board 570 may be attached to the second surface of the second vibration device 520. The third adhesive member 630 may not overlap the second flexible circuit board 570 in the third direction (Z-axis direction) as shown in FIGS. 6 and 8. Alternatively, the third adhesive member 630 may be disposed on the second flexible circuit board 570 attached to the second surface of the second vibration device 520.

A gap may be provided between the second vibration device 520 and the bracket 600. The gap between the second vibration device 520 and the bracket 600 may serve as a resonator of the second sound output by vibrating the display panel 300 by the second vibration device 520.

When the first vibration device 510 and the second vibration device 520 are disposed on the heat dissipation member of the panel lower member 400, the vibration of the first vibration device 510 and the second vibration device 520 The first heat radiation layer of the heat radiation member may be broken. Therefore, the heat dissipation member may be removed in the region where the first vibration device 510 and the second vibration device 520 are disposed, and the first vibration device 510 and the second vibration device 520 are Can be attached to Alternatively, in the region where the first vibration device 510 and the second vibration device 520 are disposed, the cushioning member and the heat dissipating member may be removed, and the first vibration device 510 and the second vibration device 520 It can be attached to the lower surface of the absorbent member.

The first flexible circuit board 560 may be attached to the second surface of the first vibration device 510 using an anisotropic conductive film. Lead lines of the first flexible circuit board 560 may be connected to one end and the other end of the voice coil of the first vibration device 510, respectively. A connection terminal provided at one end of the first flexible circuit board 560 may be connected to lead lines. The connection terminal of the first flexible circuit board 560 may be inserted into the insertion portion of the second connector 315. The first flexible circuit board 560 may be a flexible printed circuit board (FPC) or a flexible film.

The second flexible circuit board 570 may be attached to the second surface of the second vibration device 520 using an anisotropic conductive film. Lead lines of the second flexible circuit board 570 may be connected to one end and the other end of the voice coil of the second vibration device 520, respectively. A connection terminal provided at one end of the second flexible circuit board 570 may be connected to lead lines. The connection terminal of the second flexible circuit board 570 may be inserted into the insertion portion of the third connector 316. The second flexible circuit board 570 may be a flexible printed circuit (FPC) or a flexible film.

6 to 8, the first vibration device 510 is fixed to both the display panel 300 and the bracket 600, so that the display panel 300 and the bracket 600 can be vibrated. have. Therefore, the first sound may be output by vibrating the display panel 300 by the first vibration device 510, and a haptic may be provided by vibrating the bracket 600 by the first vibration device 510. . That is, it is possible to provide both a sound and a haptic interface using one vibration device.

Also, since the second vibration device 520 is fixed to the display panel 300, it may vibrate the display panel 300. Therefore, the second sound can be output by vibrating the display panel 300 by the second vibration device 520.

9 is a cross-sectional view illustrating a display area of the display panel of FIGS. 6 to 8 in detail.

Referring to FIG. 9, the display panel 300 may include a substrate SUB1 and a pixel array layer PAL. The pixel array layer PAL may include a thin film transistor layer 303, a light emitting device layer 304, and a thin film encapsulation layer 305 as shown in FIG. 9.

A buffer layer 302 may be formed on the substrate SUB1. The buffer layer 302 may be formed on the substrate SUB1 to protect the thin film transistors 335 and light emitting devices from moisture penetrating through the substrate SUB1 vulnerable to moisture permeation. The buffer layer 302 may be formed of a plurality of inorganic layers alternately stacked. For example, the buffer layer 302 may be formed as a multilayer in which one or more inorganic layers of a silicon oxide layer (SiOx), a silicon nitride layer (SiNx), and SiON are alternately stacked. The buffer layer may be omitted.

A thin film transistor layer 303 is formed on the buffer layer 302. The thin film transistor layer 303 includes thin film transistors 335, a gate insulating film 336, an interlayer insulating film 337, a protective film 338, and a planarization film 339.

Each of the thin film transistors 335 includes an active layer 331, a gate electrode 332, a source electrode 333, and a drain electrode 334. 6 illustrates that the thin film transistor 335 is formed in an upper gate (top gate) method in which the gate electrode 332 is positioned above the active layer 331, it should be noted that the present invention is not limited thereto. That is, in the thin film transistors 335, a lower gate (bottom gate) method in which the gate electrode 332 is positioned under the active layer 331 or the gate electrode 332 is formed on the upper and lower portions of the active layer 331 It may be formed in a double gate method located in both.

An active layer 331 is formed on the buffer layer 302. The active layer 331 may be formed of a silicon-based semiconductor material or an oxide-based semiconductor material. A light blocking layer for blocking external light incident on the active layer 331 may be formed between the buffer layer 302 and the active layer 331.

A gate insulating layer 336 may be formed on the active layer 331. The gate insulating layer 336 may be formed of an inorganic layer, for example, a silicon oxide layer (SiOx), a silicon nitride layer (SiNx), or multiple layers thereof.

A gate electrode 332 and a gate line may be formed on the gate insulating layer 336. The gate electrode 332 and the gate line are any of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu). It may be formed as a single layer or multiple layers made of one or an alloy thereof.

An interlayer insulating layer 337 may be formed on the gate electrode 332 and the gate line. The interlayer insulating layer 337 may be formed of an inorganic layer, for example, a silicon oxide layer (SiOx), a silicon nitride layer (SiNx), or multiple layers thereof.

A source electrode 333, a drain electrode 334, and a data line may be formed on the interlayer insulating layer 337. Each of the source electrode 333 and the drain electrode 334 may be connected to the active layer 331 through a contact hole passing through the gate insulating layer 336 and the interlayer insulating layer 337. The source electrode 333, the drain electrode 334, and the data line are molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd). And it may be formed of a single layer or multiple layers made of any one of copper (Cu) or an alloy thereof.

A protective layer 338 for insulating the thin film transistor 335 may be formed on the source electrode 333, the drain electrode 334, and the data line. The protective layer 338 may be formed of an inorganic layer, for example, a silicon oxide layer (SiOx), a silicon nitride layer (SiNx), or multiple layers thereof.

A planarization layer 339 may be formed on the passivation layer 338 to flatten a step due to the thin film transistor 335. The planarization film 339 may be formed of an organic film such as an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, and a polyimide resin. have.

A light emitting element layer 304 is formed on the thin film transistor layer 303. The light emitting element layer 304 includes light emitting elements and a pixel defining layer 344.

The light emitting elements and the pixel defining layer 344 are formed on the planarization layer 339. The light emitting device is exemplified as an organic light emitting device including an anode electrode 341, light emitting layers 342, and a cathode electrode 343.

The anode electrode 341 may be formed on the planarization layer 339. The anode electrode 341 may be connected to the source electrode 333 of the thin film transistor 335 through a contact hole penetrating the passivation layer 338 and the planarization layer 339.

The pixel defining layer 344 may be formed to cover the edge of the anode electrode 341 on the planarization layer 339 to partition the pixels PX. That is, the pixel defining layer 344 serves as a pixel defining layer defining the pixels PX. In each of the pixels PX, an anode electrode 341, a light emitting layer 342, and a cathode electrode 343 are sequentially stacked so that holes from the anode electrode 341 and electrons from the cathode electrode 343 are transferred to the light emitting layer 342 ) Represents a region that is combined with each other to emit light.

Emission layers 342 are formed on the anode electrode 341 and the pixel defining layer 344. The emission layer 342 may be an organic emission layer. The emission layer 342 may emit one of red light, green light, and blue light. Alternatively, the emission layer 342 may be a white emission layer emitting white light, and in this case, a red emission layer, a green emission layer, and a blue emission layer may be stacked, and may be a common layer formed in common with the pixels PX. have. In this case, the display panel 300 may further include separate color filters for displaying red, green, and blue colors.

The emission layer 342 may include a hole transporting layer, a light emitting layer, and an electron transporting layer. In addition, the light emitting layer 342 may be formed in a tandem structure of two or more stacks, and in this case, a charge generation layer may be formed between the stacks.

The cathode electrode 343 is formed on the emission layer 342. The second electrode 343 may be formed to cover the emission layer 342. The second electrode 343 may be a common layer commonly formed in the pixels PX.

When the light emitting element layer 304 is formed in a top emission method that emits light in an upward direction, the anode electrode 341 is a laminated structure of aluminum and titanium (Ti/Al/Ti), and a laminated structure of aluminum and ITO (ITO/Al/ITO), APC alloy, and a laminated structure of APC alloy and ITO (ITO/APC/ITO). The APC alloy is an alloy of silver (Ag), palladium (Pd), and copper (Cu). In addition, the cathode electrode 263 is a transparent metallic material (TCO, Transparent Conductive Material) such as ITO and IZO that can transmit light, or magnesium (Mg), silver (Ag), or magnesium (Mg) and silver (Ag). ) May be formed of a semi-transmissive conductive material such as an alloy. When the cathode electrode 343 is formed of a semi-transmissive metal material, light emission efficiency may be increased due to microcavities.

When the light emitting device layer 304 is formed in a bottom emission method that emits light in a downward direction, the anode electrode 341 is a transparent metal material such as ITO or IZO (TCO, Transparent Conductive Material) or magnesium (Mg). , Silver (Ag), or may be formed of a semi-transmissive conductive material such as an alloy of magnesium (Mg) and silver (Ag). The second electrode 343 is a laminated structure of aluminum and titanium (Ti/Al/Ti), a laminated structure of aluminum and ITO (ITO/Al/ITO), an APC alloy, and a laminated structure of APC and ITO (ITO/APC /ITO) can be formed of a highly reflective metal material. When the anode electrode 341 is formed of a semi-transmissive metal material, light emission efficiency may be increased due to microcavities.

A thin film encapsulation layer 305 is formed on the light emitting device layer 304. The thin film encapsulation layer 305 serves to prevent penetration of oxygen or moisture into the light emitting layer 342 and the cathode electrode 343. To this end, the thin film encapsulation layer 305 may include at least one inorganic layer. The inorganic film may be formed of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, or titanium oxide. In addition, the thin film encapsulation layer 305 may further include at least one organic layer. The organic layer may be formed to have a sufficient thickness to prevent particles from penetrating the thin film encapsulation layer 305 and being injected into the light emitting layer 342 and the cathode electrode 343. The organic film may include any one of epoxy, acrylate, or urethane acrylate.

A touch sensor layer may be formed on the thin film encapsulation layer 305. When the touch sensor layer is directly formed on the thin film encapsulation layer 305, there is an advantage in that the thickness of the display device 10 can be reduced compared to when a separate touch panel is attached to the thin film encapsulation layer 305.

The touch sensor layer may include touch electrodes for sensing a user's touch in a capacitive manner, and touch lines connecting the pads and the touch electrodes. For example, the touch sensor layer may sense a user's touch using a self-capacitance method or a mutual capacitance method.

10 is a cross-sectional view illustrating the first vibration device of FIGS. 7 and 8 in detail.

Referring to FIG. 10, the first vibration device 510 may be a linear resonance actuator LRA that vibrates the display panel 300 by generating magnetic force using a voice coil. The first vibration device 510 may include a lower chassis 501, a flexible circuit board 502, a voice coil 503, a magnet 504, a spring 505, and an upper chassis 506.

The lower chassis 501 and the upper chassis 506 may be formed of a metal material. The flexible circuit board 502 is disposed on one surface of the lower chassis 501 facing the upper chassis 506 and is connected to the first flexible circuit board 560. The voice coil 503 may be connected to one surface of the flexible circuit board 502 facing the upper chassis 506. Accordingly, one end of the voice coil 503 is electrically connected to any one of the lead lines of the first flexible circuit board 560, and the other end of the voice coil 503 is electrically connected to the other one of the lead lines. Can be connected to. The magnet 504 is a permanent magnet, and a voice coil groove 641 in which the voice coil 503 is accommodated may be formed on one surface facing the voice coil 503. An elastic body such as a spring 505 is disposed between the magnet 504 and the upper chassis 506.

The direction of the current flowing through the voice coil 503 may be controlled by a first driving voltage applied to one end of the voice coil 503 and a second driving voltage applied to the other end. An applied magnetic field may be formed around the voice coil 503 according to the current flowing through the voice coil 503. That is, when the first driving voltage is a voltage of positive polarity and the second driving voltage is a voltage of negative polarity, and when the first driving voltage is a voltage of negative polarity and the second driving voltage is a voltage of positive polarity, the flow through the voice coil 503 The direction of the current is reversed. In accordance with the AC driving of the first driving voltage and the second driving voltage, attractive force and repulsive force alternately act on the magnet 504 and the voice coil 503. Therefore, the magnet 504 can reciprocate between the voice coil 503 and the upper chassis 506 by the spring 505.

Meanwhile, vibration due to the reciprocating motion of the magnet 504 may be transmitted to both the lower chassis 501 and the upper chassis 506. Therefore, the lower chassis 501 may be disposed to face the bracket 600 and the upper chassis 506 may be disposed to face the display panel 300. Alternatively, the lower chassis 501 may face the display panel 300 and the upper chassis 506 may face the bracket 600.

According to the embodiment shown in FIG. 10, the first sound can be output by vibrating the display panel 300 by the reciprocating motion of the magnet 504 of the first vibration device 510, and the bracket 600 is vibrated. By doing so, haptics can be provided.

11 is a cross-sectional view showing in detail the second vibration device of FIGS. 6 and 8. 12 is an exemplary view showing a method of vibrating a vibration layer disposed between a first branch electrode and a second branch electrode of the second vibration device of FIG. 11.

11 and 12, the second vibration device 520 uses a piezoelectric element that vibrates the display panel 300 by using a piezoelectric material that contracts or expands according to an applied voltage, or a piezoelectric element (壓電素子) that vibrates the display panel 300. It may be a piezoelectric actuator. The second vibration device 520 may include a vibration layer 511, a first electrode 512, and a second electrode 513.

The first electrode 512 may include a first stem electrode 5121 and first branch electrodes 5122. The first stem electrode 5121 may be disposed on at least one side of the vibration layer 511 as shown in FIG. 11. Alternatively, the first stem electrode 5121 may be disposed through a part of the vibration layer 511. The first stem electrode 5121 may be disposed on the upper surface of the vibration layer 511. The first branch electrodes 5122 may be branched from the first stem electrode 5121. The first branch electrodes 5122 may be disposed parallel to each other.

The second electrode 513 may include a second stem electrode 5131 and second branch electrodes 5132. The second electrode 513 may be disposed apart from the first electrode 512. Accordingly, the second electrode 513 may be electrically separated from the first electrode 512. The second stem electrode 5131 may be disposed on at least one side of the vibration layer 511. In this case, the first stem electrode 5121 may be disposed on the first side of the vibration layer 511, and the second stem electrode 5131 may be disposed on the second side of the vibration layer 511. Alternatively, the second stem electrode 5131 may be disposed through a part of the vibration layer 511. The second stem electrode 5131 may be disposed on the upper surface of the vibration layer 511. The second branch electrodes 5132 may be branched from the second stem electrode 5131. The second branch electrodes 5132 may be disposed parallel to each other.

The first branch electrodes 5122 and the second branch electrodes 5132 may be disposed parallel to each other in a horizontal direction (X-axis direction or Y-axis direction). In addition, the first branch electrodes 5122 and the second branch electrodes 5132 may be alternately disposed in the vertical direction (Z-axis direction). That is, the first branch electrodes 5122 and the second branch electrodes 5132 are the first branch electrode 5122, the second branch electrode 5132, and the first branch electrode 5122 in the vertical direction (Z-axis direction). , The second branch electrodes 5132 may be repeatedly disposed in the order.

The first electrode 512 and the second electrode 513 may be connected to pads of the second flexible circuit board 570. Pads of the second flexible circuit board 570 may be connected to the first electrode 512 and the second electrode 513 disposed on one surface of the second vibration device 520.

The vibration layer 511 may be a piezoelectric element that is deformed according to a driving voltage applied to the first electrode 512 and a driving voltage applied to the second electrode 513. In this case, the vibration layer 511 may be any one of a piezoelectric material such as a Poly Vinylidene Fluoride (PVDF) film or a PZT (Plumbum Ziconate Titanate), or an Electro Active Polymer.

Since the manufacturing temperature of the vibration layer 511 is high, the first electrode 512 and the second electrode 513 may be formed of silver (Ag) having a high melting point or an alloy of silver (Ag) and palladium (Pd). In order to increase the melting point of the first electrode 512 and the second electrode 513, when the first electrode 512 and the second electrode 513 are formed of an alloy of silver (Ag) and palladium (Pd), The content of silver (Ag) may be higher than the content of palladium (Pd).

The vibration layer 511 may be disposed between the first branch electrodes 5122 and the second branch electrodes 5132. The vibration layer 511 contracts or expands according to a difference between the driving voltage applied to the first branch electrode 5122 and the driving voltage applied to the second branch electrode 5132.

11, when the polarity direction of the vibration layer 511 disposed between the first branch electrode 5122 and the second branch electrode 5132 disposed under the first branch electrode 5122 is the upper direction (↑) , The vibration layer 511 may have a positive polarity in an upper region adjacent to the first branch electrode 5122 and a negative polarity in a lower region adjacent to the second branch electrode 5132. In addition, when the polarity direction of the vibration layer 511 disposed between the second branch electrode 5132 and the first branch electrode 5122 disposed under the second branch electrode 5132 is the downward direction (↓), the vibration layer The 511 may have a negative polarity in an upper region adjacent to the second branch electrode 5132, and may have a positive polarity in a lower region adjacent to the first branch electrode 5122. The polarity direction of the vibration layer 511 may be determined by a polling process in which an electric field is applied to the vibration layer 511 using the first branch electrode 5122 and the second branch electrode 5132.

12, when the polarity direction of the vibration layer 511 disposed between the first branch electrode 5122 and the second branch electrode 5132 disposed under the first branch electrode 5122 is the upper direction (↑) , When a positive driving voltage is applied to the first branch electrode 5122 and a negative driving voltage is applied to the second branch electrode 5122, the vibration layer 511 may contract according to the first force F1. have. The first force F1 may be a contractile force. In addition, when a driving voltage having a negative polarity is applied to the first branch electrode 5122 and a driving voltage having a positive polarity is applied to the second branch electrode 5122, the vibration layer 511 expands according to the second force F2. I can. The second force F2 may be an elongation force.

Similar to FIG. 12, the polarity direction of the vibration layer 511 disposed between the second branch electrode 5132 and the first branch electrode 5122 disposed below the second branch electrode 5132 is in the lower direction (↓) In this case, when a positive driving voltage is applied to the second branch electrode 5132 and a negative driving voltage is applied to the first branch electrode 5122, the vibrating layer 511 may expand according to the elongation force. Further, when a negative driving voltage is applied to the second branch electrode 5132 and a positive driving voltage is applied to the first branch electrode 5122, the vibration layer 511 may contract according to the contraction force.

When the driving voltage applied to the first electrode 512 and the driving voltage applied to the second electrode 513 are alternately repeated in positive and negative polarities, the vibration layer 511 repeatedly contracts and expands. Accordingly, the second vibration device 520 vibrates. Since the second vibration device 520 is disposed on one surface of the heat dissipation film 130, when the vibration layer 511 of the second vibration device 520 contracts and expands, the display panel 300 It vibrates in the third direction (Z-axis direction) which is the thickness direction of 300). In this way, when the display panel 300 vibrates by the second vibration device 520, a second sound may be output.

A protective layer 519 may be additionally disposed on the second surface and side surfaces of the second vibration device 520. The protective layer 519 may be formed of an insulating material or may be formed of the same material as the vibration layer 511. The protective layer 519 may be disposed on the first electrode 512, the second electrode 513, and the vibration layer 511 exposed without being covered by the first electrode 512 and the second electrode 513. . The protective layer 519 is to be disposed to surround the exposed vibration layer 511 without being covered by the first electrode 512, the second electrode 513, and the first electrode 512 and the second electrode 513. I can. Therefore, the vibration layer 511, the first electrode 512, and the second electrode 513 of the second vibration device 520 may be protected by the protective layer 519. The protective layer 519 may be omitted.

13 is a graph showing sound pressure levels according to frequencies of a first sound output by a first vibration device, a sound output by a second vibration device, and a sound output by a conventional speaker.

13 illustrates a first sound SOUND1 output by vibrating the display panel 300 by the first vibration device 510 and a second sound output by vibrating the display panel 300 by the second vibration device 520. A sound SOUND2 and a third sound SOUND output by a conventional speaker are shown. In FIG. 13, the X-axis indicates the frequency and the Y-axis indicates the sound pressure level (SPL).

Referring to FIG. 13, the first sound SOUND1 may be a low sound having a high sound pressure level in a low frequency band of 150 Hz to 500 Hz or less. For example, the sound pressure level of the first sound SOUND1 may be 60 dB or more at 150 Hz to 500 Hz.

The second sound SOUND2 may be a high sound having a high sound pressure level in a high frequency band of 500Hz to 2kHz. For example, the second sound SOUND2 may be approximately 70 dB or more at 500 Hz to 10 kHz.

The third sound SOUND3 may be a high sound having a high sound pressure level in a high frequency band of 500Hz to 2kHz. For example, the third sound SOUND3 may be approximately 70 dB or more at 500 Hz to 10 kHz.

Since the display device 10 may output the first sound SOUND1 and the second sound SOUND2, a low sound may be reinforced compared to when only the third sound SOUND3 is output by a conventional speaker. Accordingly, the display device 10 may output a sound with enhanced low sound than when only the third sound SOUND3 is output by a conventional speaker.

14A is a graph showing sound pressure levels according to frequencies of fundamental sounds and harmonics of a first sound output by the first vibration device when the first vibration device is fixed only on the display panel. 14B is a graph showing sound pressure levels according to frequencies of fundamental sounds and harmonics of a first sound output by the first vibration device when the first vibration device is fixed only to the bracket. 14C is a graph showing sound pressure levels according to frequencies of fundamental sounds and harmonics of a first sound output by the first vibration device when the first vibration device is fixed to both the display panel and the bracket.

In FIGS. 14A to 14C, the first sound output by the first vibration device 510 includes a fundamental tone (FT) and harmonic overtones. Overtone refers to an overtone that has a frequency that is an integer multiple of that of the basic sound. In FIGS. 14A to 14C, a first overtone (HT1) corresponding to an overtone having a frequency twice as high as a basic sound, a second overtone (HT2) corresponding to an overtone having a frequency three times that of the basic sound, and a frequency four times higher than the basic sound. Only a third overtone (HT3) corresponding to an overtone having a and a fourth overtone (HT4) corresponding to an overtone having a frequency of 5 times that of the basic sound is illustrated. In Figs. 14A to 14C, the X axis indicates the frequency (Hz), and the Y axis indicates the sound pressure level (dB).

Referring to FIG. 14A, when the first vibration device 510 is fixed only to the display panel 300, the sound pressure level of the fundamental sound FT in the frequency band of 150 Hz to 200 Hz is lower than the sound pressure level of the fifth harmonic FT5. In addition, the sound pressure level of the fundamental sound FT in the frequency band of 300 Hz to 800 Hz is lower than that of the third overtone FT3. In addition, the sound pressure level of the fundamental sound FT in the frequency band of 350Hz to 450Hz is lower than the sound pressure level of the fourth harmonic FT4 and the sound pressure level of the fifth harmonic FT5.

Referring to FIG. 14B, when the first vibration device 510 is fixed to the second surface opposite to the first surface of the bracket 600 facing the display panel 300, the fundamental sound ( The sound pressure level of FT) is lower than the sound pressure level of the third overtone FT3.

Referring to FIG. 14C, when the first vibration device 510 is fixed to the first surface of the display panel 300 and the bracket 600, the sound pressure level of the fundamental sound FT in the frequency band of 150 Hz to 1 kHz is first To fourth harmonics HT1, HT2, HT3, HT4, respectively, higher than the sound pressure levels.

According to the embodiment shown in FIGS. 14A to 14C, when the first vibration device 510 is fixed to both the display panel 300 and the bracket 600, the sound pressure of the fundamental sound FT in the frequency band of 150 Hz to 1 kHz. The first to fourth harmonics HT1, HT2, HT3, HT4 are higher than the sound pressure levels, but the first vibration device 510 is fixed only to the display panel 300 and the first vibration device 510 This is not the case when) is fixed to the bracket 600. Accordingly, when the first vibration device 510 is fixed to both the display panel 300 and the bracket 600, the distortion rate of the first sound output by vibrating the display panel 300 by the first vibration device 510 is As shown in FIG. 15, when the first vibration device 510 is fixed only to the display panel 300, the distortion rate of the first sound and when the first vibration device 510 is fixed only to the bracket 600 may be lower than the distortion rate of the first sound. I can.

15 illustrates a distortion factor of a first sound according to a frequency when the first vibration device is fixed to the display panel, the first vibration device is fixed to the bracket, and the first vibration device is fixed to both the display panel and the bracket. It is a graph showing.

Referring to FIG. 15, the X-axis indicates frequency (Hz), and the Y-axis indicates total harmonic distortion (THD) of the first sound. The distortion rate of the first sound is an index indicating the degree of distortion of the fundamental sound due to harmonics, and is known as the total harmonic distortion.

When the first vibration device 510 is fixed to both the display panel 300 and the bracket 600 in the frequency band of 150 Hz to 1 kHz (①), the distortion rate of the first sound is determined by the first vibration device 510 on the display panel ( 300) only when fixed (②) and when the first vibration device 510 is fixed only to the bracket 600 (③), the distortion rate of the first sound is mostly lower than that of the first sound. That is, when the first vibration device 510 is fixed to both the display panel 300 and the bracket 600, the distortion rate of the first sound is first when the first vibration device 510 is fixed only to the display panel 300. When the distortion rate of the sound and the first vibration device 510 is fixed only to the bracket 600, the distortion rate of the first sound may be lower. Accordingly, as shown in FIG. 15, when the first vibration device 510 is fixed to both the display panel 300 and the bracket 600, the first vibration device 510 is fixed only to the display panel 300 and the first vibration. The device 510 may provide a first sound of higher sound quality than when the device 510 is fixed only to the bracket 600.

16 is a bottom view illustrating an example of a middle frame attached to a lower portion of a display panel. 17 is a cross-sectional view illustrating an example of IV-IV' of FIG. 16.

The embodiment shown in FIGS. 16 and 17 differs from the embodiment shown in FIGS. 4 and 8 in that the second hole H2 is formed instead of the second groove GR2. In FIGS. 16 and 17, descriptions overlapping with the embodiments shown in FIGS. 4 and 8 are omitted.

16 and 17, the second hole H2 may be a hole penetrating the bracket 600. Since the second hole H2 serves as a resonator of the second vibration device 520, the position of the second hole H2 may be changed according to the position of the second vibration device 520. When the second hole H2 is disposed to overlap the second vibration device 520 in the third direction (Z-axis direction) instead of the second groove GR2, the second vibration device 520 causes the display panel ( By vibrating (300), the space of the echo drum of the output second sound may be widened. Therefore, the sound pressure level of the second sound can be further increased.

18 is a bottom view illustrating an example of a middle frame attached to a lower portion of a display panel. 19 is a cross-sectional view illustrating an example of V-V' of FIG. 18.

In the embodiment shown in FIGS. 18 and 19, the second groove GR2 is omitted, and the battery hole BH is disposed to overlap the first vibration device 510. And there is a difference. In FIGS. 18 and 19, overlapping descriptions of the embodiments shown in FIGS. 4 and 8 are omitted.

18 and 19, the battery hole BH is a hole penetrating the bracket 600 and is disposed to overlap the battery 790 and the second vibration device 520 in the third direction (Z-axis direction). Can be. In this case, by vibrating the display panel 300 by the second vibrating device 520, a space for the resonator of the second sound output may be widened. Therefore, the sound pressure level of the second sound can be further increased.

The length of the battery 790 in the first direction (X-axis direction) may be longer than the length of the second vibration device 520 in the first direction (X-axis direction). Accordingly, the length of the first direction (X-axis direction) of the battery hole BH in the region overlapping the battery 790 is the first direction of the battery hole BH in the region overlapping the second vibration device 520 It can be longer than the length of (X-axis direction).

The battery hole BH may not overlap with the first groove GR1, but is not limited thereto. When the battery hole BH overlaps the second vibration device 520, the first groove GR1 may be omitted. In this case, the second surface of the first vibration device 510 is attached to a separate support member as shown in FIGS. 20 to 23, and the separate support member may be fixed to the bracket 600.

20 is a bottom view illustrating an example of a middle frame attached to a lower portion of a display panel. 21 is a cross-sectional view illustrating an example of VI-VI' of FIG. 3. 22 is a cross-sectional view showing an example of VI-VI' of FIG. 3.

The embodiments shown in FIGS. 20 to 22 are different from the embodiments shown in FIGS. 4 and 8 in that a first hole H1 is formed instead of the first groove GR1. In FIGS. 20 to 22, descriptions overlapped with the embodiments shown in FIGS. 4 and 8 are omitted.

20 to 22, a separate support member 650 for fixing the first vibration device 510 to the bracket 600 is required. The second surface of the first vibration device 510 may be attached to the support member 650 by the second adhesive member 620. The support member 650 may be fixed to the first surface of the bracket 600 by the fixing members 660. Therefore, the first vibration device 510 may vibrate the bracket 600 to provide haptics. The support member 650 may include plastic, metal, or both plastic and metal. The support member 650 may be formed of the same material as the bracket 600.

Referring to FIG. 21, the support member 650 may include a bottom portion 651, sidewall portions 652, and fixing portions 653. 21 illustrates that the support member 650 includes a plurality of sidewall portions 652 and a plurality of fixing portions 653, but may include one sidewall portion 652 and one fixing portion 653. I can.

The bottom portion 651 is formed flat in a first direction (X-axis direction) and a second direction (Y-axis direction), and a second adhesive member 620 may be attached to an upper surface of the bottom portion 651. The length of the bottom portion 651 in the third direction (Z-axis direction) may be smaller than the length of the bracket 600 in the third direction (Z-axis direction). The bottom part 651 has been illustrated to have a rectangular shape on a plane, but is not limited thereto.

The sidewall portion 652 may be bent at the edge of the bottom portion 651 and may be disposed parallel to the sidewall of the first hole H1. The sidewall portion 652 may be bent from at least one side of the bottom portion 651.

The fixing part 653 may be bent at an upper edge of the sidewall part 652 and disposed on the first surface of the bracket 600. The fixing part 653 may include a fixing hole into which the fixing member 660 is inserted, and the bracket 600 may include a fixing groove overlapping the fixing hole of the fixing part 653. The fixing member 660 may be inserted into the fixing hole of the fixing part 653 and the fixing groove of the bracket 600 in the third direction (Z-axis direction), and thus the fixing part 653 may be inserted into the bracket 600. Can be fixed. The fixing members 660 may be screws, the fixing hole of the fixing part 653 may be a screw hole, and the fixing groove of the bracket 600 may be a screw groove.

Meanwhile, in FIG. 21, the bracket 600 includes a protrusion in the form of a hook or a hook protruding from the first surface of the bracket 600, and the fixing part 653 of the support member 650 is instead of the fixing hole. , It may include an insertion portion to which the protrusion of the bracket 600 is inserted and fixed. In this case, the support member 650 may be fixed to the bracket 600 without separate fixing members 660.

Referring to FIG. 22, in the support member 650, fixing portions 653 are omitted and may include a bottom portion 651 and sidewall portions 652.

The sidewall portion 652 may include a hole into which the fixing member 660 is inserted, and the bracket 600 may include a fixing hole overlapping the hole of the sidewall portion 652. The fixing member 660 may be inserted into the fixing hole of the fixing part 653 and the fixing groove of the bracket 600 in a direction intersecting the third direction (Z-axis direction), whereby the fixing part 653 is a bracket It can be fixed at 600. The fixing members 660 may be screws, a fixing hole of the side wall portion 652 may be a screw hole, and a fixing groove of the bracket 600 may be a screw groove.

Meanwhile, in order to widen the reverberation space of the second sound output by vibrating the display panel 300 by the second vibration device 520, the second groove GR2 of FIG. 20 is a second groove as shown in FIGS. 16 and 17. It may be replaced by the hole H2. Alternatively, the second groove GR2 of FIG. 20 may be omitted as shown in FIGS. 18 and 19, and the battery hole BH may be formed to extend to the second groove GR2.

23 is a bottom view illustrating an example of a middle frame attached to a lower portion of a display panel. 24 is a cross-sectional view illustrating an example of VII-VII' of FIG. 3.

The embodiments shown in FIGS. 23 and 24 are different from the embodiments shown in FIGS. 20 to 22 in that the support member 650 is formed to cover the first hole H1. In FIGS. 23 and 24, descriptions overlapping with the embodiments shown in FIGS. 4 and 8 are omitted.

23 and 24, the support member 650 may protrude from the first hole H1 based on the second surface of the bracket 600 in the third direction (Z-axis direction). The support member 650 may be fixed to the second surface of the bracket 600 by the fixing members 660. Therefore, the first vibration device 510 may vibrate the bracket 600 to provide haptics.

As shown in FIG. 24, the support member 650 may include a bottom portion 651 and a fixing portion 653. In FIG. 24, it is illustrated that the support member 650 includes a plurality of fixing parts 653, but may include one fixing part 653.

The bottom portion 651 is formed flat in a first direction (X-axis direction) and a second direction (Y-axis direction), and a second adhesive member 620 may be attached to an upper surface of the bottom portion 651. The length of the bottom portion 651 in the third direction (Z-axis direction) may be smaller than the length of the bracket 600 in the third direction (Z-axis direction). The bottom part 651 has been illustrated to have a rectangular shape on a plane, but is not limited thereto.

The fixing part 653 may extend from the edge of the bottom part 651 and be disposed on the second surface of the bracket 600. The length of the bottom portion 651 in the third direction (Z-axis direction) may be longer than the length of the fixing portion 653 in the third direction (Z-axis direction), but is not limited thereto. The length of the bottom portion 651 in the third direction (Z-axis direction) may be substantially the same as the length of the fixing portion 653 in the third direction (Z-axis direction). The fixing member 660 may be inserted into the fixing hole of the fixing part 653 and the fixing groove of the bracket 600 in the third direction (Z-axis direction), and thus the fixing part 653 may be inserted into the bracket 600. Can be fixed. The fixing members 660 may be screws, the fixing hole of the fixing part 653 may be a screw hole, and the fixing groove of the bracket 600 may be a screw groove.

Meanwhile, in order to widen the reverberation space of the second sound output by vibrating the display panel 300 by the second vibration device 520, the second groove GR2 of FIG. 23 is a second groove as shown in FIGS. 16 and 17. It may be replaced by the hole H2. Alternatively, the second groove GR2 of FIG. 23 may be omitted as shown in FIGS. 18 and 19 and may be formed by extending the battery hole BH to the second groove GR2.

Embodiments of the present invention have been described above with reference to the accompanying drawings, but those of ordinary skill in the art to which the present invention pertains can be implemented in other specific forms without changing the technical spirit or essential features of the present invention. You can understand. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting.

10: display device 100: cover window
300: display panel 310: display circuit board
320: display driving circuit 330: touch driving circuit
340: first vibration driving circuit 350: second vibration driving circuit
400: panel lower cover 510: first vibration device
520: second vibration device 511: vibration layer
512: first electrode 5121: first stem electrode
5122: first branch electrode 513: second electrode
5131: second stem electrode 5132: second branch electrode
560: first flexible circuit board 570: second flexible circuit board
600: bracket 650: support member
641: bottom portion 652: side wall portion
653: fixing part 700: main circuit board
710: main processor 720: camera device
730: main connector 790: battery
900: lower cover

Claims (31)

Display panel;
A bracket disposed on the first surface of the display panel; And
A first vibration device disposed between a first surface of the display panel and a first surface of the bracket facing the first surface of the display panel,
The first vibration device vibrates the display panel and the bracket to output a first sound or provide haptics. The method of claim 1,
A display device wherein a first surface of the first vibration device is fixed to a first surface of the display panel, and a second surface of the first vibration device is fixed to a first surface of the bracket. The method of claim 2,
A first adhesive member disposed between the display panel and the first vibration device; And
The display device further includes a second adhesive member disposed between the bracket and the first vibration device. The method of claim 1,
The bracket is provided on the first surface of the bracket and includes a first groove overlapping the first vibration device. The method of claim 4,
A display device wherein a first surface of the first vibration device is fixed to a first surface of the display panel, and a second surface of the first vibration device is fixed to a bottom surface of the first groove. The method of claim 5,
A first adhesive member disposed between the display panel and the first vibration device; And
The display device further includes a second adhesive member disposed between the bottom surface of the first groove and the first vibration device. The method of claim 1,
The bracket includes a first hole overlapping the first vibration device. The method of claim 7,
A display device disposed on a second surface of the first vibration device and including a support member supporting the first vibration device. The method of claim 8,
The support member overlaps the first hole. The method of claim 8,
The support member is fixed to a second surface opposite to the first surface of the bracket by using a fixing member. The method of claim 8,
The support member is disposed on at least one side of the first vibration device. The method of claim 11,
The support member is fixed to a sidewall of the first hole of the bracket by using a fixing member. The method of claim 8,
The support member is disposed on the first surface of the bracket. The method of claim 13,
The support member is fixed to the first surface of the bracket by using a fixing member. Display panel;
A bracket disposed on the first surface of the display panel;
A first vibration device disposed between a first surface of the display panel and a first surface of the bracket facing the first surface of the display panel; And
A second vibration device disposed on the first surface of the display panel,
The first vibration device vibrates the display panel and the bracket to output a first sound or provide a haptic,
The second vibration device vibrates the display panel to output a second sound. The method of claim 15,
A display device wherein a first surface of the first vibration device is fixed to a first surface of the display panel, and a second surface of the first vibration device is fixed to a first surface of the bracket. The method of claim 16,
A first adhesive member disposed between the display panel and the first vibration device; And
The display device further includes a second adhesive member disposed between the bracket and the first vibration device. The method of claim 15,
A display device having a gap between the second vibration device and the bracket. The method of claim 18,
A display device further comprising a third adhesive member disposed between the display panel and the second vibration device. The method of claim 15,
The bracket includes a first groove overlapping the first vibration device and provided on the first surface of the bracket, and a second groove overlapping the second vibration device. The method of claim 20,
The first surface of the first vibration device is fixed to the first surface of the display panel, the second surface of the first vibration device is fixed to the bottom surface of the first groove,
The first surface of the second vibration device is fixed to the first surface of the display panel, and a gap is provided between the second surface of the second vibration device and the bottom surface of the second groove. The method of claim 15,
The bracket includes a first groove provided on the first surface of the bracket and a second hole overlapping the second vibration device and overlapping the first vibration device. The method of claim 22,
Further comprising a battery disposed on a second surface opposite to the first surface of the bracket,
The second hole overlaps the battery. The method of claim 15,
The bracket includes a first hole in which the first vibration device is disposed and a second hole in which the second vibration device is disposed. The method of claim 24,
A display device disposed on a second surface of the first vibration device and including a support member supporting the first vibration device. The method of claim 25,
The support member overlaps the first hole. The method of claim 15,
The bracket includes a first hole overlapping the first vibration device and a second hole overlapping the second vibration device. The method of claim 27,
Further comprising a battery disposed on a second surface opposite to the first surface of the bracket,
The second hole overlaps the battery. The method of claim 15,
The first vibration device is a linear resonance actuator that vibrates the display panel and the bracket by generating magnetic force using a voice coil according to an applied voltage,
The second vibration device is a piezoelectric element or a piezoelectric actuator that vibrates the display panel by using a piezoelectric material that contracts or expands according to an applied voltage. The method of claim 29,
The first vibration device,
A voice coil to which a first driving voltage is applied to one end and a second driving voltage is applied to the other end;
A magnet having a voice coil groove in which the voice coil is accommodated on one side;
An elastic body disposed on the other surface opposite to one surface of the magnet; And
A display device including a chassis disposed on the elastic body. The method of claim 29,
The second vibration device,
A first electrode to which a third driving voltage is applied,
A second electrode to which a fourth driving voltage is applied, and
A vibration layer disposed between the first electrode and the second electrode and having a piezoelectric material that contracts or expands according to a third driving voltage applied to the first electrode and a fourth driving voltage applied to the second electrode. Display device.

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