KR20210086027A - Display apparatus - Google Patents

Abstract

A display device according to an embodiment of the present specification comprises: a display panel that displays an image; a front member disposed on a front surface and a side surface of the display panel, and comprising a flat surface part and a curved surface part curved from the flat surface part; and a vibration generating device disposed on a rear surface of the display panel and vibrating the display panel, wherein the vibration generating device comprises a first vibration generating device disposed in a center of the display panel, and a second vibration generating device disposed on the flat surface part and the curved surface part. Therefore, the present invention can provide the display device capable of outputting a stereo sound.

Description

display device {DISPLAY APPARATUS}

This specification relates to a display device.

The display device displays an image on the display panel, and a separate speaker must be installed to provide sound. When the speaker is arranged in the display device, the speaker occupies a space, so there is a problem in that the design and space arrangement of the display device are limited.

The speaker applied to the display device may be, for example, an exciter including a magnet and a coil. However, when the actuator is applied to a display device, there is a disadvantage in that the thickness is thick. Accordingly, a piezoelectric element capable of implementing a thin thickness is attracting attention.

Since the piezoelectric element is brittle, it is easily damaged due to an external impact, and thus, there is a problem in that the reliability of sound reproduction is low. In addition, when a speaker such as a piezoelectric element is applied to a flexible display device, there is a problem in that damage occurs due to brittle characteristics.

Accordingly, the inventors of the present specification recognized the above-mentioned problems, and conducted various experiments to implement a vibration generating device capable of improving sound quality and having unbreakable reliability when applied to a flexible display device. Through various experiments, a display device having a new structure including a vibration generator capable of improving sound quality and reliability was invented.

SUMMARY An object of the present specification is to provide a display device including a vibration generating device disposed on a rear surface of a display panel to vibrate the display panel to generate sound, and to improve sound pressure characteristics.

An object to be solved according to an embodiment of the present specification is to provide a vibration generating device applicable to a flexible display device.

The problems to be solved according to the embodiments of the present specification are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

A display device according to an embodiment of the present specification includes a display panel for displaying an image, a front member disposed on front and side surfaces of the display panel, and a front member including a flat portion and a curved portion curved from the flat portion, and disposed on the rear surface of the display panel and a vibration generating device for vibrating the display panel, wherein the vibration generating device includes a first vibration generating device disposed at the center of the display panel, and a second vibration generating device disposed on a flat portion and a curved portion.

A display device according to an embodiment of the present specification includes a display panel for displaying an image, a front member disposed on the front and side surfaces of the display panel and including a flat portion and a curved portion curved from the flat portion, and a flat portion and a curved portion and a vibration generating device including a plurality of first portions and a plurality of second portions disposed between the plurality of first portions.

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

The display device according to the embodiment of the present specification constitutes a vibration generating device that vibrates the display panel, so that the sound generating device and/or the user can generate the sound so that the sound of the display device moves toward the front of the display panel It may be implemented as a haptic device that outputs feedback according to an operation.

The display device according to the embodiment of the present specification can output the sound of the high and mid-range range in the lateral direction by configuring the vibration generating device on the curved surface of the display device, so that it is possible to provide a display device capable of outputting stereo sound. .

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

Since the contents of the invention described in the problems to be solved, the means for solving the problems, and the effects do not specify the essential characteristics of the claims, the scope of the claims is not limited by the matters described in the contents of the invention.

1 is a view showing a display device according to an embodiment of the present specification.
FIG. 2 is a cross-sectional view taken along line I-I' shown in FIG. 1 ;
3 is a view showing a display device including a vibration generating device according to an embodiment of the present specification.
4 is a view in which a vibration generating device according to an embodiment of the present specification is disposed on a display device.
5 is a view in which a vibration generating device according to an embodiment of the present specification is disposed on a curved portion and a flat portion.
6 to 8 are views showing the directivity according to the arrangement of the vibration generating device according to the embodiment of the present specification.
9 is a view showing a display device including a vibration generating device according to another embodiment of the present specification.
10 is a view showing a display device including a vibration generating device according to another embodiment of the present specification.
11 and 12 are views showing the directivity of the vibration generating device according to the embodiment of the present specification.
13 and 14 are diagrams illustrating vibration characteristics of a vibration generating device according to an embodiment of the present specification.
15 is a view showing a vibration generating device according to an embodiment of the present specification.
FIG. 16 is a cross-sectional view taken along the line II-II' shown in FIG. 15;
17A is a view showing a state in which both ends of the vibration generating device of FIG. 15 are folded upward.
17B is a view showing a state in which both ends of the vibration generating device of FIG. 15 are folded downward.
18 is a view showing a vibration generating device according to another embodiment of the present specification.
19 is a view showing a vibration generating device according to another embodiment of the present specification.
20 is a view showing a vibration generating device according to another embodiment of the present specification.

Advantages and features of the present specification and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present specification is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments allow the disclosure of the present specification to be complete, and common knowledge in the technical field to which this specification belongs It is provided to fully inform those who have the scope of the invention, and the present specification is only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present specification are illustrative and the present specification is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in the description of the present specification, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present specification, the detailed description thereof will be omitted. When "includes," "has," "consisting of," etc. mentioned in this specification are used, other parts may be added unless "only" is used. When a component is expressed in the singular, the case in which the plural is included is included unless otherwise explicitly stated.

In interpreting the components, even if there is no explicit description of the error range, it is interpreted as including the error range.

In the case of a description of a positional relationship, for example, when the positional relationship of two parts is described as "on," "upper," "lower," "nextly", for example, "right" Alternatively, one or more other parts may be placed between two parts unless "directly" is used.

In the case of a description of a temporal relationship, when the temporal precedence is described as “after,” “following,” “after,” “before,” etc., it is not continuous unless “immediately” or “directly” is used. cases may be included.

Although the first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the spirit of the present specification.

In describing the components of the present specification, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms. When it is described that a component is “connected,” “coupled,” or “connected” to another component, the component may be directly connected or connected to the other component, but indirectly without specifically expressly stated. It should be understood that other components may be “interposed” between each component that is connected or can be connected.

“At least one” should be understood to include all combinations of one or more of the associated elements. For example, the meaning of “at least one of the first, second, and third components” means not only the first, second, or third components, but also two of the first, second, and third components. It can be said to include a combination of all or more components.

As used herein, the term “display device” may include a display device such as a liquid crystal module (LCM) including a display panel and a driving unit for driving the display panel, and an organic light emitting display module (OLED module). And, LCM, a finished product (complete product or final product) including an OLED module, a notebook computer, a television, a computer monitor, a vehicle or an automotive apparatus (automotive apparatus) or other types of vehicle (vehicle) including other types of electric devices (equipment apparatus), a set electronic apparatus, such as a mobile electronic apparatus such as a smart phone or an electronic pad, or a set device (set device or set apparatus) may be included.

Accordingly, the display device in the present specification may include a display device itself such as an LCM, an OLED module, and the like, and an application product including an LCM, an OLED module, or the like, or a set device that is an end-user device.

In addition, in some examples, an LCM or OLED module composed of a display panel and a driving unit may be expressed as a “display device”, and an electronic device as a finished product including the LCM and OLED module may be divided and expressed as a “set device”. For example, the display device may include a liquid crystal (LCD) or organic light emitting (OLED) display panel, and a source PCB that is a control unit for driving the display panel. The set device may further include a set PCB, which is a set controller electrically connected to the source PCB to drive the entire set device.

The display panel used in this embodiment may be any type of display panel such as a liquid crystal display panel, an organic light emitting diode (OLED) display panel, and an electroluminescent display panel. Examples are not limited thereto. For example, the display panel may be a display panel capable of generating sound by being vibrated by the vibration generating device according to the embodiment of the present specification. The display panel applied to the display device according to the embodiment of the present specification is not limited to the shape or size of the display panel.

For example, when the display panel is a liquid crystal display panel, it may include a plurality of gate lines and data lines, and pixels formed at intersections of gate lines and data lines. In addition, an array substrate including a thin film transistor as a switching element for controlling light transmittance in each pixel, an upper substrate including a color filter and/or a black matrix, and the like, and a liquid crystal layer formed between the array substrate and the upper substrate It may be composed of

When the display panel is an organic light emitting (OLED) display panel, it may include a plurality of gate lines and data lines, and pixels formed at intersections of the gate lines and the data lines. In addition, an array substrate including a thin film transistor which is a device for selectively applying a voltage to each pixel, an organic light emitting device (OLED) layer on the array substrate, and an encapsulation substrate disposed on the array substrate to cover the organic light emitting device layer Alternatively, it may be configured to include an encapsulation substrate or the like. The encapsulation substrate may protect the thin film transistor and the organic light emitting device layer from external impact, and may prevent penetration of moisture or oxygen into the organic light emitting device layer. In addition, the layer formed on the array substrate may include an inorganic light emitting layer, for example, a nano-sized material layer, and a quantum dot light emitting layer. Another example may include a micro light emitting diode.

The display panel may further include a backing such as a metal plate attached to the display panel. Other structures may be included, for example, other structures made of different materials.

Each feature of the various embodiments of the present specification may be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each of the embodiments may be independently implemented with respect to each other or may be implemented together in a related relationship. may be

Hereinafter, an embodiment of the present specification will be described with reference to the accompanying drawings and embodiments. The scales of the components shown in the drawings have different scales from the actual ones for convenience of description, and thus are not limited to the scales shown in the drawings.

In order to provide sound to the display device, if the speaker is implemented in the form of a film, the thickness of the display device may be reduced. Since the film-type vibration generating device can be manufactured in a large area, it can be applied to a large-area display device, but there is a problem in that it is difficult to apply to a large area due to low vibration due to low piezoelectric properties. When a ceramic is applied to improve the piezoelectric characteristics, there is a problem in that durability is weak and the size of the ceramic is limited. When a vibration generating device composed of a piezoelectric composite including a piezoelectric ceramic is applied to a display device, the piezoelectric composite mainly vibrates in the left and right directions based on the horizontal direction, for example, in the left and right directions based on the horizontal direction of the display device. Therefore, since the display device cannot be sufficiently vibrated in the vertical (or front-back) direction, it is difficult to apply to the display device, and a desired sound cannot be output to the front of the display device. When a film-type piezoelectric body is applied to a display device, there is a problem in that sound pressure characteristics are low compared to a speaker such as an exciter. When a laminated piezoelectric body in which a plurality of films composed of several layers of a film-type piezoelectric body is laminated is applied to a display device to improve sound pressure, power consumption increases and the thickness of the display device becomes thick. In addition, it was recognized that, when a single vibration generating device is disposed on the rear surface of a display panel, for example, a mobile display device, a mono sound may be output, but there is a problem in that it is difficult to output a stereo sound. Therefore, since it is difficult to realize stereo sound, a vibration generating device can be further disposed on the edge of the display panel. However, it is difficult to place an exciter in a flexible display device having a curved surface on the display panel, and when a speaker made of piezoelectric ceramic is disposed, piezoelectric It has been recognized that ceramics have a problem of brittleness.

Accordingly, the inventors of the present specification have conducted various experiments in order to realize stereo acoustic characteristics and a vibration generating device applicable to a flexible display device. Through various experiments, a display device including a vibration generating device of a new structure that can implement stereo acoustic characteristics and can be applied to a flexible display device was invented. This will be described below.

1 is a view showing a display device according to an embodiment of the present specification. FIG. 2 is a cross-sectional view taken along line I-I' shown in FIG. 1 ;

1 and 2 , the display device according to the exemplary embodiment of the present specification may include a front member 10 , a display panel 30 , a vibration generating device 50 , and a middle frame 90 . The scales of the front member 10 , the display panel 30 , and the middle frame 90 shown in FIGS. 1 and 2 are different from the actual scale for convenience of explanation, so they are limited to the scales shown in the drawings. doesn't work

The front member 10 may protect the display panel 30 from external impact by covering the front and side surfaces of the display panel 30 .

The front member 10 may be made of a transparent plastic material, a glass material, or a reinforced glass material. As an example, the front member 10 may have any one of sapphire glass and gorilla glass or a stacked structure thereof. As another example, the front member 10 may include a transparent plastic material such as PET (polyethyleneterephthalate). The front member 10 may be made of tempered glass in consideration of scratches and transparency. In this case, the front member 10 may be a cover glass.

The front member 10 according to an example may include a flat portion 11 and a curved portion 13 . The flat portion 11 is a central portion of the front member 10 and may be a transparent region through which light is transmitted. The planar part 11 may have a planar shape as a whole. For example, the flat portion 11 may be a front portion, a flat portion, a front window, or a flat window.

The curved portion 13 may be curved from the flat portion 11 . For example, the curved portion 13 may be curved in a curved shape having a preset radius of curvature from the edge of the flat portion 11 . The shortest distance between the curved portion 13 and the flat portion 11 may be 2.0 mm or more, but is not limited thereto. The height of the curved portion 13 from the flat portion 11 may be 2.0 mm or more, for example, may be at least 4.0 mm. The width of the curved portion 13 (or both edges) may be 3.0 mm or more, but is not limited thereto.

The curved portion 13 according to an example includes a first curved portion 13a that is curved from one side (or a left edge) of the flat portion 11 with respect to the first longitudinal direction X, and the flat portion 11 of the first curved portion 13a. It may include a second curved portion 13b curved from the other side (or the right edge). In this case, the front member 10 has a two-sided bending structure (or both edge bending structure) in which the left edge and the right edge are curved, thereby improving the aesthetics of the display device, and the bezel width in the short side direction of the display device can reduce

Each of the first curved portion 13a and the second curved portion 13b may include a curved portion CP and a side portion SW.

The curved portion CP may be curved at a specific angle of 60 degrees or more from the flat portion 11 , but is not limited thereto. As an example, the curved portion CP may have a curved cross-section having at least one curvature between the end of the flat portion 11 and the side portion SW with respect to the first longitudinal direction X. As another example, the curved portion CP may have a sector-shaped cross-section having an acute central angle with respect to the first longitudinal direction X. For example, the curved portion CP may have a sector-shaped cross-section having a central angle of 90 degrees.

)은 60도 이상일 수 있으며, 이에 한정되는 것은 아니다. 예를 들면, 측부(SW)와 평면부(11) 사이의 사잇각(

)은 80도 ~ 90도 범위일 수 있다.The side part SW may extend to have a predetermined length from the end of the curved part CP. The angle between the side part SW and the flat part 11 (

) may be 60 degrees or more, but is not limited thereto. For example, the angle between the side part SW and the plane part 11 (

) may range from 80 degrees to 90 degrees.

As shown in FIG. 1 , the curved portion 13 according to an example may be curved in a curved shape having a preset radius of curvature from all edge portions of the flat portion 11 . Accordingly, the edge portion of the flat portion 11 may have a structure in which the entirety is curved by the curved portion 13 . In this case, since the front member 10 has a four-sided bending structure that is curved as a whole, the aesthetics of the display device may be improved, and the bezel widths in the long side direction and the short side direction of the display device may be reduced.

The front member 10 may further include a design layer (or a decoration layer) provided on a rear edge portion of the front member 10 . The design layer may be printed at least once on a rear (or rear) edge portion of the front member 10 facing the display panel 30 , thereby hiding a non-display area in which an image is not displayed on the display device.

The display panel 30 may display an image, for example, an electronic image or a digital image. The display panel 30 may be a flexible display panel. For example, the display panel 30 may be a flexible light emitting display panel, a flexible electrophoretic display panel, a flexible electrowetting display panel, a flexible micro light emitting diode display panel, or a flexible quantum dot light emitting display panel. In the following description, it is assumed that the display panel 30 is a flexible organic light emitting display panel.

The display panel 30 may include at least one layer attached to the inner surface (or inner surface) of the front member 10 having both edge portions curved by a specific angle or more. The display panel 30 is integrated into the inner surface of the front member 10 by a bonding process using an elastically deformable pad instead of a diaphragm method through the adhesive member 20, so that it is integrated with the display device together with the front member 10. The same structure can be implemented.

The display panel 30 is disposed on the rear surface (or the rear surface) of the front member 10 , and may display an image or sense a user's touch. The display panel 30 is bonded (or bonded) to the flat portion 11 and the curved portion 13 of the front member 10 through a bonding process using an elastically deformable pad via the adhesive member 20 rather than the diaphragm method. can be The adhesive member 20 may include a pressure sensitive adhesive (PSA) or an optical clear adhesive (OCA). The adhesive member 20 may be a transparent adhesive member, a transparent adhesive sheet, or a panel bonding member.

The display panel 30 according to an example includes a flat display portion 30a displaying an image toward the flat portion 11 of the front member 10 , and bending from one edge of the flat display portion 30a in a curved shape to form the front member 10 . ) of the curved portion 13 of the first bending display portion 30b that displays an image toward the first curved portion 13a, and the other edge of the flat display portion 30a is bent in a curved shape to form a curved portion of the cover window 10 . In (13), a second bending display unit 30c for displaying an image toward the first curved portion 13a may be included. The display panel 30 may display an image on the display units 30b and 30c including the flat display unit 30a, the first bending display unit 30b, and the second bending display unit 30c.

For example, the display panel 30 may be a top emission type, a bottom emission type, or a dual emission type according to the structure of a pixel array layer including an anode electrode, a cathode electrode, and an organic compound layer. The image can be displayed in a form such as a (Dual Emission) method. In the top emission method, visible light generated from the pixel array layer is emitted to the front of the base substrate to display an image, and in the bottom emission method, visible light generated from the pixel array layer is emitted to the rear of the base substrate to display an image. can do.

The display panel 30 according to the exemplary embodiment of the present specification may include a pixel array unit disposed in a pixel area formed by a plurality of gate lines and/or a plurality of data lines. The pixel array unit may include a plurality of pixels that display an image according to a signal supplied to the signal lines. The signal lines may include a gate line, a data line, and a pixel driving power line.

Each of the plurality of pixels includes a pixel circuit layer including a driving thin film transistor provided in the pixel region, an anode electrically connected to the driving thin film transistor, a light emitting element layer formed on the anode electrode, and a cathode electrode electrically connected to the light emitting element layer can do.

The driving thin film transistor may be configured in a transistor region of each pixel region disposed on the substrate. The driving thin film transistor may include a gate electrode, a gate insulating layer, a semiconductor layer, a source electrode, and a drain electrode. The semiconductor layer of the thin film transistor may include silicon such as a-Si, poly-Si, or low-temperature poly-Si, or an oxide such as IGZO (Indium-Gallium-Zinc-Oxide), but is not limited thereto.

The anode electrode may be provided in an opening region disposed in each pixel region to be electrically connected to the driving thin film transistor.

The light emitting device layer according to an example may include an organic light emitting device formed on the anode electrode. The organic light emitting device may be implemented to emit light of the same color, for example, white, for each pixel, or may be implemented to emit light of a different color, for example, red, green, or blue light for each pixel.

The light emitting device layer according to another example may include a micro light emitting diode device electrically connected to each of an anode electrode and a cathode electrode. The micro light emitting diode device is a light emitting diode implemented in the form of an integrated circuit (IC) or a chip, and may include a first terminal electrically connected to an anode electrode and a second terminal electrically connected to a cathode electrode. The cathode electrode may be commonly connected to the light emitting device of the light emitting device layer provided in each pixel area.

The encapsulation part may be formed on the substrate to surround the pixel array part, thereby preventing oxygen or moisture from penetrating into the light emitting device layer of the pixel array part. The encapsulation unit according to an example may have a multilayer structure in which organic material layers and inorganic material layers are alternately stacked, but is not limited thereto. The inorganic material layer may block oxygen or moisture from penetrating into the light emitting device layer of the pixel array unit. The organic material layer may be formed to have a relatively thicker thickness than the inorganic material layer to cover particles that may be generated during the manufacturing process. For example, the encapsulation unit may include a first inorganic layer, an organic layer on the first inorganic layer, and a second inorganic layer on the organic layer. The organic layer may be a foreign material cover layer.

The touch panel may be disposed on the encapsulation unit or may be disposed on the rear surface of the pixel array unit.

The vibration generating device 50 may be disposed on the rear surface of the display panel 30 . For example, the vibration generating device 50 may include a first vibration generating device 51 , a second vibration generating device 53 , and a third vibration generating device 55 . The first vibration generating device 51 may be disposed in the center of the display panel 30 . For example, the first vibration generating device 51 may be disposed on the flat portion 11 . The second vibration generating device 53 may be disposed at an edge of one side of the display panel 30 . For example, the second vibration generating device 53 may be disposed on the flat portion 11 and the first curved portion 13a. The third vibration generating device 55 may be disposed at an edge of the other side of the display panel 30 . For example, the third vibration generating device 55 may be disposed on the flat portion 11 and the second curved portion 13b.

The middle frame 90 according to an example may support the front member 10 and cover the rear surface of the display panel 30 . The middle frame 90 may be disposed on the outermost side of the display device, and may include a plastic material or a metal material. In addition, the middle frame 90 may include a metal material having a color coating layer. The middle frame 90 according to an example may be made of a metal material having a relatively high thermal conductivity, for example, an aluminum material in order to improve the heat dissipation performance of the display device.

The middle frame 90 according to an example may include a middle plate 91 and a middle sidewall 93 .

The middle plate 91 may be disposed on the rear surface of the display panel 30 . In this case, the middle plate 91 includes at least one open part through which a cable for electrical connection between the display driving circuit part connected to the display panel 30 and the host driving system passes, and various electronic circuit components mounted on the display device. It may include at least one concave portion disposed thereon.

The middle sidewall 93 may be vertically coupled to a side surface of the middle plate 91 to support the curved portion 13 of the front member 10 . For example, the middle sidewall 93 may be coupled to the curved portion 13 of the front member 10 via a double-sided tape or a waterproof tape. In this case, the waterproof performance of the display device is improved and foreign matter penetration is prevented. can be prevented.

The display device according to an example of the present specification may further include a support member 70 covering the rear surface (or rear surface) of the middle frame 90 .

The support member 70 is coupled to the middle sidewall 93 so as to face the rear surface of the middle plate 91, thereby covering the rear surface (or rear surface) of the middle frame 90 and a circuit accommodation space on the rear surface of the middle frame 90 ( 71) can be provided. The circuit accommodation space 71 is provided between the middle plate 91 and the support member 70 of the middle frame 90 to accommodate a host driving system, a memory, a battery, and the like. The support member 70 may be detachably coupled to the middle sidewall 93 for battery replacement according to battery discharge during use of the display device, or to be detachably coupled to the middle sidewall 93 only when disassembling the display device for repair. can The support member 70 may be a back cover or a rear cover, but is not limited thereto.

The support member 70 according to an example is disposed on the outermost rear surface of the display device, and includes at least one of a plastic material, a metal material, and a glass material, and may include a color coating layer. For example, the support member 70 according to an example may be glass having a transparent, translucent, or opaque color coating layer.

The support member 70 according to another example has the same shape as the front member 10 and may include a glass material having a color coating layer. For example, the support member 70 according to another example may have a structure symmetrical to the front member 10 with the middle frame 90 interposed therebetween. The support member 70 according to another example may include a transparent, translucent, or opaque color coating layer.

3 is a view showing a display device including a vibration generating device according to an embodiment of the present specification. 4 is a view in which a vibration generating device according to an embodiment of the present specification is disposed on a display device.

3 and 4 , the display device according to the exemplary embodiment of the present specification includes a first vibration generator 51 disposed in the center of the display panel 30 and a second vibration generator 51 disposed on the left side of the display panel 30 . It may include a vibration generating device 53 , and a third vibration generating device 55 disposed on the right side of the display panel 30 . For example, the second vibration generating device 53 and the third vibration generating device 55 may be disposed on the left and right sides of the display panel 30 with respect to the second direction (or Y direction). The second direction may be a long side direction or a horizontal direction of the display panel 30 .

The first to third vibration generators 51 , 53 , and 55 may be disposed on the rear surface of the display panel 30 . The first to third vibration generating devices 51 , 53 , and 55 may generate sound or vibration by using the display panel 30 as a diaphragm. The vibration generating device 50 is a transducer, a vibration generating module, a sound generating module, a sound generating device, a film actuator, a film-type piezoelectric composite actuator, a film speaker, a film-type piezoelectric speaker, or a film-type piezoelectric composite speaker. can be expressed, and is not limited to terms. For example, the first to third vibration generators 51 , 53 , and 55 may be disposed without increasing the thickness of the display panel 30 by forming a single piezoelectric composite, and may be formed of a flexible piezoelectric composite. Therefore, it can be configured in a flexible display device. The vibration generating device 50 will be described later with reference to FIGS. 15 to 20 .

The first vibration generator 51 is disposed at the center of the rear surface of the display panel 30 , and may output the first sound range S1 . The first sound band S1 may be a frequency of the low sound range. For example, the first vibration generating device 51 may be a woofer. The frequency of the low frequency band may be 200 Hz or less, but is not limited thereto.

The second vibration generating device 53 may be disposed on the left side of the rear surface of the display panel 30 based on the second direction (or Y direction), and generate third vibration based on the second direction (or Y direction). The device 55 may be disposed on the right side of the rear surface of the display panel 30 . The second vibration generating device 53 may be disposed on the rear surface of the second bending display unit 30b. The second vibration generating device 55 may be disposed on the rear surface of the third bending display unit 30c. The second vibration generator 53 may output the second sound range S2. The second sound range S2 may output a frequency of the middle and high tone range. The third vibration generator 55 may output the third sound range S3. The third sound band S3 may output a frequency of a middle and high sound range. For example, the second vibration generating device 53 and the third vibration generating device 55 may be tweeters. For example, the second vibration generating device 53 may be a left tweeter, and the third vibration generating device 55 may be a right tweeter. The mid-range frequency may be 200Hz to 3kHz, and the high-pitched frequency may be 3kHz or more, but is not limited thereto.

Referring to FIG. 4 , the second vibration generating device 53 and the third vibration generating device 55 may be disposed on a flat portion and a curved portion of the front member 10 . For example, the second vibration generating device 53 and the third vibration generating device 55 may be disposed along a curved portion and a flat portion of the front member 10 . When the second vibration generating device 53 and the third vibration generating device 55 are further configured on the curved portion 13 of the front member 10 , side radiation of the sound by the curved portion 13 may be implemented. The curved portion 13 of the front member 10 may be bent in the short side direction of the display panel 30 . The second vibration generating device 53 and the third vibration generating device 55 may be disposed on the left and right sides of the curved portion in the short side direction. For example, the second vibration generating device 53 and the third vibration generating device 55 may be disposed on the left and right sides of the curved portion in the short side direction, respectively. For example, since the second vibration generating device 53 and the third vibration generating device 55 are formed of a piezoelectric composite layer having flexibility, they may be disposed on the curved surface of the front member 10 .

Accordingly, in the vibration generating device 50 according to the embodiment of the present specification, the low-pitched frequency may be output to the front side of the display panel 30 by the first vibration generating device 51 , and the left side of the display panel 30 . and the second and third vibration generators 53 and 55 disposed on the right side of the display panel 30 may output the frequencies of the high and mid-range frequencies to the side surface of the display panel 30 . Accordingly, it is possible to provide a display device capable of outputting stereo sound.

In addition, the vibration generating device 50 according to the embodiment of the present specification vibrates according to a signal synchronized with an image displayed on the display panel 30 to vibrate the display panel 30 to generate sound. can be As another example, the vibration generating device 50 includes a haptic feedback signal (or tactile feedback) that is synchronized with a user's touch on the touch panel (or touch sensor layer) disposed on the display panel 30 or built into the display panel 30 . signal) may be a haptic device capable of vibrating the display panel 30 . For example, the vibration generating device 50 may be a haptic device that vibrates the display panel 30 to output feedback according to a user's motion. Accordingly, the display panel 30 may vibrate according to the vibration of the vibration generating device 50 to provide at least one of sound and haptic feedback to a user (or a viewer).

When the vibration generating device is disposed on the curved portion of the front member, the sound in the curved portion is affected by directivity. This will be described with reference to FIGS. 5 to 8 . 5 is a view in which a vibration generating device according to an embodiment of the present specification is disposed on a curved portion and a flat portion.

5, a1, a2, and a3 indicate positions at which the vibration generating device 53 is disposed. For example, in the case of a1 in which the vibration generating device 53 is disposed including the curved portion and the flat portion of the front member, the main lobe of M1 is formed. As another example, in the case of a2 in which the vibration generating device 53 is disposed including a part of a curved portion and a flat portion of the front member, a main lobe of M2 is formed. As another example, in the case of a3 in which the vibration generating device 53 is disposed including the curved portion of the front member, the main lobe of M3 is formed. Accordingly, the direction of the lobes of the acoustic beam is determined according to the size of the area of the curved portion of the front member, and as the size of the area of the flat portion increases, the front radiation characteristic increases.

6 to 8 are views showing the directivity according to the arrangement of the vibration generating device according to the embodiment of the present specification.

The directivity of FIGS. 6 to 8 can be measured by arranging the microphone at a position 35 cm apart from the display panel on which the vibration generator is disposed using B&K LAN XI equipment. A sinusoidal input waveform was applied to the vibration generator with a voltage of 5Vrms, and the frequency was measured at 5kHz. The measurement method does not limit the content of the present specification.

FIG. 6 is a view showing the directivity when the vibration generating device 53 is disposed on a flat surface in FIG. 5 . When the flat portion of the front member 10, for example, the vibration generating device 53 is disposed at ΔL, directivity is not implemented, it can be seen that the front radiation.

7 is a view showing the directivity when the vibration generating device 53 is disposed on the curved surface in FIG. 5 . It can be seen that the directionality is realized when the vibration generating device 53 is disposed on the curved surface of the front member 10, for example, a3.

8 is a view showing the directivity when the vibration generating device 53 is disposed on the curved portion and the flat portion of the front member in FIG. 5 . When the vibration generating device 53 is disposed including the curved portion and the flat portion of the front member 10, for example, when disposed in a3, it can be seen that directivity is realized.

6 to 8 , when the vibration generating device 50 is disposed on the curved portion 13 rather than the flat portion 11 , directivity may be implemented. Rather than arranging the vibration generating device 50 only on the curved portion 13, it can be seen that when the vibration generating device 50 is disposed including the curved portion 13 and the flat portion 11, directivity is realized and the sound pressure is increased. It can be seen that as the curved portion 13 is included smaller than the flat portion 11 , the directionality of the sound is changed due to the planar radiation characteristic, and the directivity of the sound cannot be realized. It can be seen that when the vibration generating device 50 is configured such that the curved portion 13 of the front member 10 is included more than the flat portion 11, the main lobe of the curved radiation increases and the directivity of the sound increases. . Accordingly, it is possible to output stereo sound by utilizing the curved surface. Accordingly, when the vibration generating device is disposed, the directivity of the sound can be adjusted by adjusting the length ΔL of the flat portion of the front member. For example, the directionality of the sound may be changed by adjusting the length ΔL of the flat portion of the front member.

9 is a view showing a display device including a vibration generating device according to another embodiment of the present specification.

Referring to FIG. 9 , the display device according to the exemplary embodiment of the present specification includes a first vibration generator 51 disposed in the center of the display panel 30 and a second vibration generator disposed on the left side of the display panel 30 . 53 , the third vibration generating device 55 disposed on the right side of the display panel 30 , the fourth vibration generating device 57 disposed above the display panel 30 , and the lower side of the display panel 30 . It may include a fifth vibration generating device 59 disposed in the. For example, the second vibration generating device 53 and the third vibration generating device 55 may be disposed on the left and right sides with respect to the second direction (or Y direction). The second direction may be a long side direction or a vertical direction of the display panel 30 . For example, the fourth vibration generating device 57 and the fifth vibration generating device 59 may be disposed at upper and lower sides with respect to the second direction (or Y direction). The first direction may be a short side direction or a horizontal direction of the display panel 30 .

The first vibration generator 51 is disposed at the center of the rear surface of the display panel 30 , and may output the first sound range S1 . The first sound band S1 may be a frequency of the low sound range. For example, the first vibration generating device 51 may be a woofer. The frequency of the low frequency band may be 200 Hz or less, but is not limited thereto.

The second vibration generating device 53 may be disposed on the left side of the rear surface of the display panel 30 based on the second direction (or Y direction), and generate third vibration based on the second direction (or Y direction). The device 55 may be disposed on the right side of the rear surface of the display panel 30 . The second vibration generator 53 may output a second sound range. The second sound band may output a frequency of the middle and high sound range. The third vibration generating device 55 may output a third sound range. The third sound band may output a frequency of the middle and high sound range. For example, the second vibration generating device 53 and the third vibration generating device 55 may be tweeters. For example, the second vibration generating device 53 may be a left tweeter, and the third vibration generating device 55 may be a right tweeter. The mid-range frequency may be 200Hz to 3kHz, and the high-pitched frequency may be 3kHz or more, but is not limited thereto. For example, the second vibration generating device 53 and the third vibration generating device 55 may be disposed on the curved portion and the flat portion of the front member in consideration of directivity and sound pressure, as described with reference to FIGS. 5 to 8 . have. For example, the second vibration generating device 53 and the third vibration generating device 55 may be disposed along a curved portion and a flat portion of the front member. Accordingly, since the second vibration generating device 53 and the third vibration generating device 55 can output sound by utilizing the curved surface of the front member 10, the stereo sound can be further improved.

The fourth vibration generating device 57 may be disposed above the rear surface of the display panel 30 based on the second direction (or Y direction), and generate fifth vibration based on the second direction (or Y direction). The device 59 may be disposed below the rear surface of the display panel 30 . The fourth vibration generating device 57 may output a fourth sound range. The fourth sound band may output the frequencies of the middle and high frequency bands. The fifth vibration generator 59 may output a fifth sound range. The fifth sound band may output the frequencies of the middle and high frequency bands. For example, the fourth vibration generating device 57 and the fifth vibration generating device 59 may be tweeters. For example, the fourth vibration generating device 57 may be an upper tweeter, and the fifth vibration generating device 59 may be a lower tweeter.

For example, the curved portion of the front member 10 may be bent at both sides in the short side direction of the display panel 30 . The second vibration generating device 53 and the third vibration generating device 55 may be disposed on the left and right sides of the curved portion in the short side direction. For example, the second vibration generating device 53 and the third vibration generating device 55 may be disposed on the left and right sides of the curved portion in the short side direction, respectively. As another example, the curved portion of the front member 10 may be bent in the short side direction and the long side direction of the display panel 30 . The second vibration generating device 53 and the third vibration generating device 55 may be disposed on the left and right sides of the curved portion in the short side direction. For example, the second vibration generating device 53 and the third vibration generating device 55 may be disposed on the left and right sides of the curved portion in the short side direction, respectively. The fourth vibration generating device 57 and the fifth vibration generating device 59 may be disposed above and below the curved portion in the long side direction. For example, the fourth vibration generating device 57 and the fifth vibration generating device 59 may be respectively disposed above and below the curved portion in the longitudinal direction.

Accordingly, in the vibration generating device 50 according to another embodiment of the present specification, the low-pitched frequency may be output to the front surface of the display panel 30 by the first vibration generating device 51 , and the display panel 30 . The second to fifth vibration generators 53 , 55 , 57 , and 59 disposed on the left, right, upper and lower sides of the display panel 30 may output the frequencies of the high and mid-range frequencies to the side surface of the display panel 30 . Accordingly, it is possible to provide a display device capable of outputting stereo sound.

10 is a view showing a display device including a vibration generating device according to another embodiment of the present specification.

Referring to FIG. 10 , the display device according to the embodiment of the present specification may include a vibration generating device 50 disposed on the rear surface of the display panel 30 . The vibration generating device 50 according to the embodiment of the present specification includes a first vibration generating device 51 disposed in the center of the display panel 30 and a fourth vibration generating device 57 disposed above the display panel 30 . ), and a fifth vibration generating device 59 disposed below the display panel 30 . For example, the fourth vibration generating device 57 and the fifth vibration generating device 59 may be disposed at upper and lower sides with respect to the second direction (or Y direction). The first direction may be a short side direction or a vertical direction of the display panel 30 . The second direction may be a long side direction or a horizontal direction of the display panel 30 . For example, the fourth vibration generating device 57 and the fifth vibration generating device 59 may be disposed in the long side direction of the display panel 30 . The display panel 30 is bent in the vertical direction, and a fourth vibration generating device 57 and a fifth vibration generating device 59 may be disposed on a curved surface of the display panel 30 in the vertical direction.

The first vibration generator 51 is disposed at the center of the rear surface of the display panel 30 , and may output the first sound range S1 . The first sound band S1 may be a frequency of the low sound range. For example, the first vibration generating device 51 may be a woofer. The frequency of the low frequency band may be 200 Hz or less, but is not limited thereto.

The fourth vibration generating device 57 may be disposed above the rear surface of the display panel 30 based on the second direction (or Y direction), and generate fifth vibration based on the second direction (or Y direction). The device 59 may be disposed below the rear surface of the display panel 30 . The fourth vibration generating device 57 may output a fourth sound range. The fifth sound band may output the frequencies of the middle and high frequency bands. The fifth vibration generator 59 may output a fifth sound range. The fifth sound band may output the frequencies of the middle and high frequency bands. For example, the fourth vibration generating device 57 and the fifth vibration generating device 59 may be tweeters. For example, the fourth vibration generating device 57 may be an upper tweeter, and the fifth vibration generating device 59 may be a lower tweeter. The mid-range frequency may be 200Hz to 3kHz, and the high-pitched frequency may be 3kHz or more, but is not limited thereto.

For example, the curved portion of the front member 10 may be bent at both sides in the long side direction of the display panel 30 . The fourth vibration generating device 57 and the fifth vibration generating device 59 may be disposed above and below the curved portion in the long side direction. For example, the fourth vibration generating device 57 and the fifth vibration generating device 59 may be disposed on the left and right sides of the curved portion in the long side direction, respectively.

Accordingly, in the vibration generating device 50 according to another embodiment of the present specification, the low-pitched frequency may be output to the front surface of the display panel 30 by the first vibration generating device 51 , and the display panel 30 . The frequencies of the high and mid-range bands may be output to the side surface of the display panel 30 by the fourth and fifth vibration generating devices 57 and 59 disposed above and below the display panel 30 . Accordingly, it is possible to provide a display device capable of outputting stereo sound.

11 and 12 are views showing the directivity of the vibration generating device according to the embodiment of the present specification.

Since the directivity of FIGS. 11 and 12 is the same as the measurement method described with reference to FIGS. 6 to 8 , a description thereof will be omitted.

11 is a view showing the directivity when the fourth and fifth vibration generators 57 and 59 in FIG. 10 are disposed on a flat surface. Referring to FIG. 11 , it can be seen that directivity is not implemented in the vibration generating device.

FIG. 12 is a view showing the directivity when the fourth and fifth vibration generating devices 57 and 59 are disposed on a flat surface and a curved portion in FIG. 10 . Referring to FIG. 12 , it can be seen that the vibration generating device according to the embodiment of the present specification has a directivity that is separated left and right. Therefore, it can be seen that the vibration generating device according to the embodiment of the present specification implements stereo sound separated from left and right. For example, when the length of the flat portion is adjusted and disposed on the flat portion and the curved portion, stereo sound may be further improved. For example, the length ΔL of the flat part may be 4 mm or more and 10 mm or less, but is not limited thereto. When the length ΔL of the flat part is less than 4 mm, the directivity of the vibration generating device cannot be implemented, and when the length ΔL of the flat part exceeds 10 mm, the directivity of the vibration generating device cannot be realized. Therefore, when the length ΔL of the flat part is 4 mm or more and 10 mm or less, the directivity of the vibration generating device can be implemented.

13 and 14 are diagrams illustrating vibration characteristics of a vibration generating device according to an embodiment of the present specification.

The vibration characteristics of FIGS. 13 and 14 were measured by Optomet's Laser Scanning-Vibrometer, and were measured by scanning the surface vibration of the vibration generating device. 13 and 14, Min. From to Max., the acoustic velocity increases.

13 is a view showing vibration characteristics when the fourth and fifth vibration generators 57 and 59 are disposed on a flat surface in FIG. 10 . Referring to FIG. 13 , it can be seen that the vibration appears only in the center when it is disposed on a flat surface. For example, the maximum value (Max.) of the speed of sound of the vibration generating device may be 0.0082 m/s.

FIG. 14 is a view showing vibration characteristics when the fourth and fifth vibration generating devices 57 and 59 are disposed on a flat portion and a curved portion in FIG. 10 . Referring to FIG. 14 , it can be seen that in the vibration generating device according to the embodiment of the present specification, vibrations appear on the left and right sides including the center. For example, it can be seen that the vibration generating device according to the embodiment of the present specification exhibits even vibration in the entire region including the center. For example, the maximum value (Max.) of the sound speed of the vibration generating device is 0.0332 m/s. It can be that Therefore, it can be seen that the speed of sound is increased by about 25% compared to the vibration generator of FIG. 10 . Local mode reduces acoustic radiation performance with multiple intersecting small acoustic shapes in the treble. For example, the local mode of the sound emitted from the vibration generating device disposed on the curved surface is reduced and the width of the main lobe is reduced, so that the sound overlapping phenomenon can be improved. As a result, clean sound can be realized at high frequencies, and stereo sound can be realized by the left and right vibration generators separated.

15 is a view showing a vibration generating device according to an embodiment of the present specification. FIG. 16 is a cross-sectional view taken along line II-II' shown in FIG. 15 .

15 and 16 , the vibration generating device 50 according to an example of the present specification may include a piezoelectric composite layer (PCL), a first electrode 230 , and a second electrode 240 .

The piezoelectric composite layer PCL may include a plurality of first portions 210 and a plurality of second portions 220 respectively disposed between the plurality of first portions 210 .

The vibration generating device 50 according to an example may include a plurality of first parts 210 and a plurality of second parts 220 . For example, the plurality of first portions 210 may have piezoelectric properties, and the plurality of second portions 220 may supplement the impact resistance of the first portion 210 and may have flexibility.

Each of the plurality of first parts 210 according to an example may be formed of an inorganic material part. The inorganic material may include an electroactive material. In an electroactive material, a potential difference is generated by dielectric polarization according to the relative position change of positive (+) ions and negative (-) ions while pressure or torsion is applied to the crystal structure by an external force, and the electric field according to the applied voltage is reversed. It has the characteristic that vibration is generated by

Each of the plurality of first parts 210 according to an example may include an inorganic material or a piezoelectric material that vibrates due to a piezoelectric effect (or piezoelectric characteristic) of an electric field. For example, each of the plurality of first parts 210 may be expressed as an electroactive part, an inorganic material part, a piezoelectric material part, or a vibrating part, but is not limited thereto.

Each of the plurality of first parts 210 according to an example may be made of a ceramic-based material capable of realizing a relatively high vibration or a piezoelectric ceramic having a perovskite-based crystal structure. The perovskite crystal structure may have a piezoelectric and reverse piezoelectric effect, and may have an orientation. The perovskite crystal structure is _{represented by the chemical formula of ABO 3} , A may be formed of a divalent metal element, and B may be formed of a tetravalent metal element. As an example, in _{the formula of ABO 3} , A and B may be cations, and O may be anions. For example, it may include a _{PbTiO 3, PbZrO 3, BaTiO 3} , and at least one of SrTiO _3, and, and the like.

In the case of the central ion, for example, PbTiO ₃ , the position of the Ti ion is changed in the perovskite crystal structure by an external stress or magnetic field, and the polarization is changed to generate a piezoelectric effect. For example, the perovskite crystal structure is an unsymmetric structure in a cubic shape, which is a symmetric structure by an external stress or magnetic field, tetragonal, orthorhombic, and A piezoelectric effect may be generated by changing into a shape such as a rhombohedral. In the morphotropic phase boundary region of a tetragonal and a rhombohedral having a non-symmetrical structure, the polarization is high and the rearrangement of the polarization is easy, so that it can have high piezoelectric properties.

As an example, the inorganic material formed in each of the plurality of first portions 210 is selected from among lead (Pb), zirconium (Zr), titanium (Ti), zinc (Zn), nickel (Ni), and niobium (Nb). It may include one or more types, but is not limited thereto.

As another example, the inorganic material portion configured in each of the plurality of first portions 210 is a lead zirconate titanate (PZT)-based material including lead (Pb), zirconium (Zr), and titanium (Ti), or lead (Pb). ), zinc (Zn), nickel (Ni), and PZNN (lead zirconate nickel niobate)-based material including niobium (Nb), but is not limited thereto. Further, the inorganic material portion may include CaTiO _3, BaTiO _3, SrTiO _3, and at least one that does not contain lead (Pb), but is not limited to such.

Each of the plurality of second portions 220 according to an example may be formed of an organic material portion, and may be disposed to fill a space between the inorganic material portion that is the first portion 210 . The organic material part can absorb the shock applied to the inorganic material part (or the first part) by being disposed between the inorganic material parts, and release the stress concentrated on the inorganic material part to generate the vibration device 50 ) can improve the overall durability, and can also provide flexibility to the vibration generating device (50). The vibration generating device 50 has flexibility so that it can be bent into a shape matching the shape of the display panel 50 . Accordingly, the vibration generating device 50 according to the embodiment of the present specification can be applied to the display devices of FIGS. 1 to 7 . For example, the vibration generating device 50 according to the embodiment of the present specification may be applied to a flexible display device.

Each of the plurality of second portions 220 may be disposed between the plurality of first portions 210 . Each of the plurality of first parts 210 and the plurality of second parts 220 may be disposed (or arranged) in parallel with each other on the same plane (or on the same layer). Each of the plurality of second portions 220 is configured to fill a gap between the two adjacent first portions 210 so as to be connected or adhered to the adjacent first portions 210 . Accordingly, in the vibration generating device 50, the vibration energy due to the link in the unit lattice of the first part 210 may be increased by the second part 220, so that the vibration may increase, and the piezoelectric characteristics and flexor characteristics may be increased. Flexibility can be secured. And, the vibration generating device 50 is a large-area complex having a single-layer structure by alternately disposing the second part 220 and the first part 210 along the longitudinal direction (X) with respect to one side on the same plane. A film (or an organic-inorganic composite film) may be configured, and since the large-area composite film has a thin thickness, the thickness of the display device may not increase. Since the vibration generating device 50 can be implemented as a single film and can be slimmed down, an increase in the driving voltage can be reduced or prevented. In addition, since the vibration generating device 50 according to the embodiment of the present specification includes an inorganic material portion and an organic material portion, and may be implemented in a thin film form, it does not interfere with other components and/or mechanisms constituting the display device. It may be integrated or mounted on the display device.

Each of the plurality of second portions 220 may include a polygonal pattern. Each of the plurality of second portions 220 may be disposed between the plurality of first portions 210 . Each of the plurality of first parts 210 and the plurality of second parts 220 may be disposed (or arranged) in parallel with each other on the same plane (or on the same layer). Each of the plurality of second portions 220 may be configured to fill a gap between the two adjacent first portions 210 to be connected to or adhered to the adjacent first portions 210 . For example, each of the plurality of second portions 220 may be a line pattern having a predetermined second width d2 , and may be disposed in parallel with each other with the first portion 210 interposed therebetween. Each of the plurality of second portions 220 may have the same size, for example, an area, an area, or a volume within a process error (or tolerance) range generated in the manufacturing process.

The size of the second portion 220 may be the same as or different from the size of the first portion 210 . For example, the size of each of the first portion 210 and the second portion 220 may be set according to requirements such as vibration characteristics and/or flexibility of the vibration generating device 50 .

Each of the plurality of second parts 220 according to an example has a lower modulus and viscoelasticity compared to the first part 210, thereby improving the reliability of the first part 210, which is vulnerable to impact due to brittle characteristics. have. For example, the vibration generating device 50 for vibrating the display panel 30 may have maximum vibration characteristics when it has impact resistance and high rigidity. In order for the vibration generating device 50 to have impact resistance and high rigidity, each of the plurality of second parts 220 is a material having a relatively high damping factor (tan δ) and a relatively high stiffness (stiffness) characteristic. can be composed of For example, each of the plurality of second portions 220 may be made of a material having a damping vector tan δ of 0.1 to 1 [Gpa] and a stiffness characteristic of 0 to 10 [Gpa]. In addition, the damping vector (tan δ) and the stiffness characteristic can also be described as a correlation between the loss coefficient and the modulus. In this case, each of the plurality of second portions 220 has a loss coefficient of 0.01 to 1 and a loss coefficient of 1 to 10 [ Gpa].

The organic material portion included in each of the plurality of second portions 220 may be formed of an organic material or an organic polymer having a flexible characteristic compared to the inorganic material portion serving as the first portion 210 . For example, each of the plurality of second portions 220 may include an organic material, an organic polymer, an organic piezoelectric material, or an organic non-piezoelectric material. For example, each of the plurality of second parts 220 may be expressed as an adhesive part having flexibility, a stretchable part, a bending part, a damping part, or a flexible part, but is not limited thereto.

The organic material part according to an example may include at least one of an organic piezoelectric material and an organic non-piezoelectric material.

-Polyvinylidene fluoride) 및 PVDF-TrFE(Polyvinylidene-trifluoroethylene) 중 적어도 하나를 포함할 수 있으며, 이에 한정되는 것은 아니다.The organic material portion including the organic piezoelectric material may improve the overall durability of the vibration generating device 50 by absorbing the impact applied to the inorganic material portion (or the first portion), and may provide a certain level of piezoelectric properties. . The organic piezoelectric material according to an example may be an organic material having an electroactive property. For example, PVDF (Polyvinylidene fluoride), beta-PVDF (

-Polyvinylidene fluoride) and PVDF-TrFE (Polyvinylidene-trifluoroethylene) may include at least one, but is not limited thereto.

The organic material portion including the organic non-piezoelectric material is composed of a curable resin composition and an adhesive containing the same, thereby absorbing the impact applied to the inorganic material portion (or the first portion), thereby improving the overall durability of the vibration generating device 50. have. The organic non-piezoelectric material according to an example may include at least one of an epoxy-based polymer, an acrylic-based polymer, and a silicone-based polymer, but is not limited thereto.

As an example, the organic material portion including the organic non-piezoelectric material may include an adhesion promoter for adhesion with the epoxy resin and the inorganic material portion for high rigidity required for the vibration generating device 50 . For example, the adhesion promoter may be a phosphate based agent or the like. The organic material portion may be cured by at least one of thermal curing and photo curing. When the organic material part is cured, a solvent-free type epoxy resin may be used to prevent the thickness uniformity of the vibration generator 50 from being reduced due to the shrinkage of the organic material part due to the volatilization of the solvent.

In addition, the organic material portion including the organic non-piezoelectric material may further include a reinforcing agent for damping characteristics in addition to the high rigidity of the vibration generating device 50 . For example, the reinforcing agent may be MBS (Methylmethacrylate-Butadiene-styrene) of a core shell type, and the content of the reinforcing agent may be 5 to 40 wt%. For example, the reinforcing agent is a core-shell type elastic body, and the shell portion has high bonding strength with an epoxy resin such as an acrylic polymer, thereby improving impact resistance or damping characteristics of the vibration generating device 50 .

Accordingly, the piezoelectric composite layer (PCL) is a thin film by alternately and repeatedly connecting the first portion 210 having piezoelectric properties made of an inorganic material and the second portion 220 having flexibility made of an organic material. can have a form. Accordingly, the piezoelectric composite layer PCL may be bent to correspond to the shape of the display panel 30 , and may have a size capable of implementing vibration characteristics or acoustic characteristics set according to the vibration of the display panel 30 . For example, the size of the first part 210 and the size of the second part 220 may be set according to piezoelectric characteristics and flexibility. For example, in a display device requiring piezoelectric characteristics rather than flexibility, the size of the first part 210 may be larger than the size of the second part 220 . As another example, in a display device requiring flexibility rather than piezoelectric characteristics, the size of the second part 220 may be larger than the size of the first part 210 . Therefore, since the piezoelectric composite layer (PCL) can be adjusted according to characteristics required in the display device, there is an advantage in that the design of the piezoelectric composite layer (PCL) is easy.

The first electrode 230 may be disposed on the first surface (or the front surface) of the piezoelectric composite layer PCL. The first electrode 230 according to an example may be formed of a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, the transparent or translucent conductive material may include indium tin oxide (ITO) or indium zinc oxide (IZO), but is not limited thereto. The opaque conductive material may include aluminum (Al), copper (Cu), gold (Au), silver (Ag), molybdenum (Mo), magnesium (Mg), or the like, or an alloy thereof, and is limited thereto. no.

The second electrode 240 may be disposed on a second surface (or rear surface) opposite to the first surface of the piezoelectric composite layer PCL. The second electrode 240 according to an example may be formed of a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, the second electrode 240 may be made of the same material as the first electrode 230 .

The vibration generating device 50 according to the embodiment of the present specification may further include a first protective layer 250 and a second protective layer 260 .

The first protective layer 250 may be disposed on the first electrode 230 and may protect the first surface or the first electrode 230 of the piezoelectric composite layer PCL. For example, the first protective layer 250 may be a polyimide (PI) film or a polyethyleneterephthalate (PET) film, but is not limited thereto.

The second passivation layer 260 may be disposed on the second electrode 240 and protect the second surface or the second electrode 240 of the piezoelectric composite layer PCL. For example, the second passivation layer 260 may be a polyimide (PI) film or a polyethyleneterephthalate (PET) film, but is not limited thereto.

Referring to FIG. 8 , each of the plurality of first parts 210 may have a first width d1 parallel to the first direction X and a length parallel to the second direction Y. Referring to FIG. Each of the plurality of second portions 220 may have a length parallel to the second direction Y while having a second area d2 equal to the first area d1 . For example, the first portion 210 and the second portion 220 may include a line shape or a stripe shape having the same size.

Accordingly, the piezoelectric composite layer (PCL) according to the embodiment of the present specification may be formed by alternately repeatedly disposing (or connecting) the first part 210 and the second part 220 having the same size on the same plane. Alternatively, it may have a single thin film shape, may vibrate in the vertical direction by the first part 210 having vibration characteristics, and may be bent in a curved shape by the second part 220 having flexibility. The piezoelectric composite layer (PCL) according to the embodiment of the present specification may be expanded to a desired size or length by lateral coupling (or connection) of the first part 210 and the second part 220 .

Accordingly, in the vibration generating device 50 of the display device according to the embodiment of the present specification, the inorganic material part (the first part) and the organic material part (the second part) are disposed on the same layer, so that the impact transmitted to the inorganic material part is induced. It may be absorbed by the material part, and thus, damage to the inorganic material part due to an impact applied to the display device from the outside and deterioration in vibration performance (or deterioration in acoustic performance) due to breakage may be minimized or prevented.

In addition, the vibration generating device 50 of the display device according to the embodiment of the present specification may vibrate (or mechanically displace) in response to an externally applied electrical signal by including a piezoelectric ceramic having a perovskite crystal structure. . For example, in the vibration generating device 50, when an alternating voltage is applied to the inorganic material part (the first part), the bending direction is alternately changed as the inorganic material part contracts and expands alternately by the reverse piezoelectric effect. Vibration may occur due to bending, and acoustic or haptic feedback may be provided to the user by vibrating the display panel 30 through the vibration.

Accordingly, the vibration generating device 50 according to the embodiment of the present specification may vibrate the display panel 30 by vibrating by an electric signal. As an example, the vibration generating device 50 may be a sound generating device capable of generating sound by vibrating the display panel 30 by vibrating according to a signal synchronized with an image displayed on the display panel 30 . As another example, the vibration generating device 50 may include a haptic feedback signal (or tactile feedback) disposed on the display panel 30 or synchronized with a user's touch on a touch panel (or touch sensor layer) built in the display panel 30 . It may be a haptic device capable of vibrating the display panel 30 by vibrating according to a signal). For example, the vibration generating device 50 may be a haptic device that vibrates the display panel 30 to output feedback according to a user's motion. Accordingly, the display panel 30 may vibrate according to the vibration of the vibration generating device 50 to provide at least one of sound and haptic feedback to a user (or a viewer).

The vibration generating device 50 according to the embodiment of the present specification may have a size corresponding to the display area of the display panel 30 . The size of the vibration generating device 50 may be 0.9 to 1.1 times the size of the display area, but is not limited thereto. For example, since the size of the vibration generating device 50 may be the same as or substantially the same as that of the display area of the display panel 30 , it may cover most of the display panel 30 , and the vibration generating device ( Since the vibration generated in 50 ) may vibrate the entire display panel 30 , a sense of localization of the sound may be high and user satisfaction may be improved. In addition, as the contact area (or panel coverage) between the display panel 30 and the vibration generating device 50 increases and the vibration area of the display panel 30 increases, according to the vibration of the display panel 30 , The generated mid-low range sound may be improved. And, in the case of a large display device, since the entire large (or large area) display panel 30 can be vibrated, the localization of the sound according to the vibration of the display panel 30 is further improved, thereby realizing a stereophonic effect. .

Therefore, the vibration generating device 50 according to the embodiment of the present specification is disposed on the rear surface of the display panel 30 to sufficiently vibrate the display panel 30 in the vertical (or front-back) direction, so that the display panel 30 moves toward the front of the display device. You can output any sound you want. In addition, since the vibration generating device 50 is implemented in the pattern shape of the organic material part and the inorganic material part, the area (or size) of the vibration generating device 50 can be infinitely expanded, and thus the display panel 30 is As the panel coverage of the vibration generating device 50 is increased, acoustic characteristics according to the vibration of the display panel 30 may be improved.

17A is a view showing a state in which both ends of the vibration generating device of FIG. 15 are folded upward. 17B is a view showing a state in which both ends of the vibration generating device of FIG. 15 are folded downward.

17A and 17B, the piezoelectric composite layer (PCL) according to the embodiment of the present specification vibrates by an electric field according to a signal applied to each of the plurality of first portions 210 in the first longitudinal direction (X) Both ends of the EP may be folded upward (+Z) or downward (-Z). In this case, as each of the plurality of second portions 220 filled or disposed between the plurality of first portions 210 has flexibility, both ends EP of the piezoelectric composite layer PCL move upward (+Z). Alternatively, even if it is bent downward (-Z), the inorganic material part, which is the first part 210 , may not be damaged or deteriorated. Accordingly, the display device having the vibration generating device 50 including the piezoelectric composite layer (PCL) according to the embodiment of the present specification is a flexible display device, for example, a curved display device that is curved with a predetermined radius of curvature. apparatus), but is not limited thereto. For example, to be used as a rollable display apparatus that is wound or unwound in a spiral form, a bendable display apparatus, or a wearable display apparatus of a type wound around the wrist. can The bendable display device may be an edge bending display device, a bezel bending display device, or an active bending display device, but is not limited thereto. For example, it may be applied to the bending display device described with reference to FIGS. 3, 9, and 10 .

18 is a view showing a vibration generating device according to another embodiment of the present specification.

Referring to FIG. 18 , a piezoelectric composite layer (PCL) according to another exemplary embodiment of the present specification may have a circular shape. For example, the piezoelectric composite layer PCL may include a plurality of first portions 210 spaced apart from each other, and a second portion 220 surrounding each of the plurality of first portions 210 .

Each of the plurality of first parts 210 may have a disk shape. Since each of the plurality of first parts 210 is formed of an inorganic material having the above-described vibration characteristics, a redundant description thereof will be omitted.

The second portion 220 may be disposed or filled between the plurality of first portions 210 to surround each side of the plurality of first portions 210 . Since the second part 220 is made of the organic material part having the flexibility as described above, a redundant description thereof will be omitted. This second part 220 provides flexibility between the plurality of first parts 210 so that the piezoelectric composite layer (PCL) or the vibration generating device 50 is resistant to deformation between the plurality of first parts 210 . Correspondingly, it can be transformed into various forms of a two-dimensional or three-dimensional form.

Each of the plurality of first parts 210 may have various shapes other than the disk shape. For example, each of the plurality of first portions 210 may have an elliptical shape, a polygonal shape, or a donut shape, but is not limited thereto.

In addition, each of the plurality of first parts 210 may have a point shape including a fine circle shape, an elliptical shape, a polygonal shape, or a donut shape, and a display device including the vibration generating device 50 including the same. The display panel may be deformed into various shapes according to the flexibility of the second part 220 disposed between the plurality of first parts 210 . For example, in the display device including the vibration generating device 50 illustrated in FIGS. 8 to 10 , the display panel has a two-dimensional concave or convex shape due to the first portion 210 (or inorganic material portion) having a line shape. The display device including the vibration generating device 50 shown in FIG. 11 can be deformed only in shape, and the display panel has a dotted shape as well as a two-dimensional shape due to the first part 210 (or inorganic material part) having a dotted shape. It can be transformed into various forms of a three-dimensional form. Accordingly, in the vibration generating device 50 having the piezoelectric composite layer (PCL) according to another embodiment of the present specification, the degree of freedom in design according to the shape of the display device may be improved, and various shapes of two or three dimensions may be obtained. It can be applied to a flexible display device that can be transformed into

19 is a view showing a vibration generating device according to another embodiment of the present specification. 20 is a view showing a vibration generating device according to another embodiment of the present specification.

Referring to FIG. 19 , a piezoelectric composite layer (PCL) according to another exemplary embodiment of the present specification may have a triangular shape. For example, the piezoelectric composite layer PCL may include a plurality of first portions 210 spaced apart from each other, and a second portion 220 surrounding each of the plurality of first portions 210 .

Each of the plurality of first parts 210 may have a triangular shape. For example, each of the plurality of first parts 210 may have a triangular plate shape. Since each of the plurality of first parts 210 is formed of an inorganic material having the above-described vibration characteristics, a redundant description thereof will be omitted.

As an example, four adjacent first portions 210 of the plurality of first portions 210 may be adjacently disposed to form a square shape (or a square shape). The vertices of each of the four adjacent first portions 210 forming the square shape may be disposed adjacent to the central portion of the square shape.

As another example, as shown in FIG. 20 , six adjacent first parts 210 among the plurality of first parts 210 may be disposed adjacent to each other to form a hexagonal shape (or a regular hexagonal shape). The vertices of each of the six adjacent first portions 210 forming the hexagonal shape may be disposed adjacent to the central portion of the hexagonal shape. Accordingly, 2N (N is a natural number of 2 or more) adjacent among the plurality of first parts 210 having a triangular shape may be adjacent to each other to form a 2N angular shape.

The second portion 220 may be disposed or filled between the plurality of first portions 210 to surround the side surfaces of each of the plurality of first portions 210 . Since the second part 220 is made of the organic material part having the flexibility as described above, a redundant description thereof will be omitted. The second portion 220 provides flexibility between the plurality of first portions 210 so that the piezoelectric composite layer (PCL) or the vibration generating device 50 responds to deformation between the plurality of first portions 210 . Therefore, it can be transformed into various forms of not only a two-dimensional form but also a three-dimensional form.

Accordingly, in the display device including the vibration generating device 50 having the piezoelectric composite layer (PCL) according to another embodiment of the present specification, the display panel is deformed to correspond to various three-dimensional deformations of the vibration generating device 50 . can be In addition, the plurality of first parts 210 having a triangular or hexagonal shape may be a fine pattern that can correspond to various shapes, and a display device to which the vibration generating device 50 including the plurality of first parts 210 is applied includes a display panel having a plurality of display panels. According to the flexibility of the second part 220 disposed between the first part 210, it may be deformed into various shapes. In addition, the display device including the piezoelectric composite layer (PCL) according to another embodiment of the present specification may be applied to the same flexible display device as the display device including the vibration generator 50 illustrated in FIGS. 17A and 17B . .

The vibration generating device according to the embodiment of the present specification may be applied to a vibration generating device disposed on a display device. A display device according to an embodiment of the present specification includes a mobile device, a video phone, a smart watch, a watch phone, a wearable apparatus, a foldable apparatus, and a rollable apparatus. apparatus), bendable apparatus, flexible apparatus, curved apparatus, electronic notebook, e-book, PMP (portable multimedia player), PDA (personal digital assistant), MP3 player, mobile Medical equipment, desktop PC, laptop PC, netbook computer, workstation, navigation, vehicle navigation, vehicle display device, vehicle device, theater device, theater display device , a television, a wallpaper device, a signage device, a game device, a notebook computer, a monitor, a camera, a camcorder, and a home appliance. In addition, the vibration generating device of the present specification can be applied to an organic light emitting lighting device or an inorganic light emitting lighting device. When a vibration generating device or a sound generating device is applied to a lighting device, it may serve as a light and a speaker. In addition, when the display device of the present specification is applied to a mobile device, it may be a speaker or a receiver, but is not limited thereto.

A display device according to an embodiment of the present specification may be described as follows.

A display device according to an embodiment of the present specification includes a display panel for displaying an image, a front member disposed on front and side surfaces of the display panel, and a front member including a flat portion and a curved portion curved from the flat portion, and disposed on the rear surface of the display panel and a vibration generating device for vibrating the display panel, wherein the vibration generating device includes a first vibration generating device disposed at the center of the display panel, and a second vibration generating device disposed on a flat portion and a curved portion.

According to some embodiments of the present specification, the first vibration generating device may output a frequency of a low frequency band.

According to some embodiments of the present specification, the second vibration generating device may output a frequency of a mid-range range.

According to some embodiments of the present specification, the second vibration generating device may be disposed on the left and right sides of the display panel in the horizontal direction, respectively.

According to some embodiments of the present specification, the second vibration generating device may be respectively disposed on the left, right, upper, and lower sides of the display panel in the horizontal direction.

According to some embodiments of the present specification, the second vibration generating device may be respectively disposed above and below the display panel in a horizontal direction.

According to some embodiments of the present specification, the first vibration generating device and the second vibration generating device are disposed between the plurality of first parts having piezoelectric characteristics and the plurality of first parts, and may include a second part having flexibility. can

According to some embodiments of the present specification, the second vibration generating device may be disposed along a flat portion and a curved portion.

According to some embodiments of the present specification, at least one of the first vibration generating device and the second vibration generating device may be a sound generating device generating sound by vibrating the display panel.

According to some embodiments of the present specification, at least one of the first vibration generating device and the second vibration generating device may be a haptic device that vibrates the display panel to output feedback according to a user's motion.

A display device according to an embodiment of the present specification includes a display panel for displaying an image, a front member disposed on the front and side surfaces of the display panel and including a flat portion and a curved portion curved from the flat portion, and a flat portion and a curved portion and a vibration generating device including a plurality of first portions and a plurality of second portions disposed between the plurality of first portions.

According to some embodiments of the present specification, the first portion may be an inorganic material portion, and the second portion may be an organic material portion.

According to some embodiments of the present specification, the vibration generating device may be disposed along a flat portion and a curved portion.

According to some embodiments of the present specification, another vibration generating device disposed at the center of the rear surface of the display panel may be further included.

According to some embodiments of the present specification, the vibration generating device may output a high-mid range, and another vibration generating device may output a low-pitched range.

According to some embodiments of the present specification, another vibration generating device may include a plurality of first parts and a plurality of second parts.

According to some embodiments of the present specification, the curved portion may be bent in the short side direction of the display panel, and the vibration generating device may be disposed on the left and right sides of the short side curved portion of the display panel, respectively.

According to some embodiments of the present specification, the curved portion may have a short side direction and a long side direction of the display panel.

direction, and the vibration generating device may be disposed on the left and right sides of the curved portion in the short side direction and above and below the curved portion in the long side direction, respectively.

According to some exemplary embodiments of the present specification, the curved portion may be bent in the long side direction of the display panel, and the vibration generating device may be respectively disposed above and below the long side curved portion of the display panel.

Although the embodiments of the present specification have been described in more detail with reference to the accompanying drawings, the present specification is not necessarily limited to these embodiments, and various modifications may be made within the scope without departing from the technical spirit of the present specification. . Accordingly, the embodiments disclosed in the present specification are for explanation rather than limiting the technical spirit of the present specification, and the scope of the technical spirit of the present specification is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present specification should be construed by the claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present specification.

10: front member
30: display panel
20: adhesive member
50, 51, 53, 55, 57, 59: vibration generating device

Claims (19)

a display panel for displaying an image;
a front member disposed on the front and side surfaces of the display panel and including a flat portion and a curved portion curved from the flat portion; and
a vibration generating device disposed on the rear surface of the display panel and vibrating the display panel;
The vibration generator is
a first vibration generating device disposed in the center of the display panel; and
and a second vibration generating device disposed on the flat portion and the curved portion. The method of claim 1,
The first vibration generating device outputs a frequency of a low-pitched range, a display device. The method of claim 1,
The second vibration generating device outputs a frequency of a mid-range range, a display device. The method of claim 1,
and the second vibration generating device is disposed on left and right sides of the display panel in a horizontal direction, respectively. The method of claim 1,
and the second vibration generating device is disposed on the left, right, upper, and lower sides of the display panel in a horizontal direction, respectively. The method of claim 1,
and the second vibration generating device is disposed above and below the display panel in a horizontal direction, respectively. The method of claim 1,
The first vibration generating device and the second vibration generating device,
a plurality of first portions having piezoelectric properties; and
and a second portion disposed between the plurality of first portions and having flexibility. The method of claim 1,
and the second vibration generating device is disposed along the flat portion and the curved portion. The method of claim 1,
and at least one of the first vibration generating device and the second vibration generating device is a sound generating device generating sound by vibrating the display panel. The method of claim 1,
At least one of the first vibration generating device and the second vibration generating device is a haptic device that vibrates the display panel to output feedback according to a user's motion. a display panel for displaying an image;
a front member disposed on the front and side surfaces of the display panel and including a flat portion and a curved portion curved from the flat portion; and
and a vibration generating device disposed on the flat portion and the curved portion and including a plurality of first portions and a plurality of second portions disposed between the plurality of first portions. 12. The method of claim 11,
The first portion is an inorganic material portion, and the second portion is an organic material portion. 12. The method of claim 11,
The vibration generating device is disposed along the flat portion and the curved portion. 12. The method of claim 11,
The display device further comprising another vibration generating device disposed in the center of the rear surface of the display panel. 15. The method of claim 14,
The vibration generating device outputs a mid-range range,
The other vibration generating device outputs a low-pitched range, a display device. 15. The method of claim 14,
and the other vibration generating device is composed of the plurality of first parts and the plurality of second parts. 12. The method of claim 11,
The curved portion is bent in a short side direction of the display panel, and the vibration generating device is disposed on left and right sides of the curved portion in the short side direction, respectively. 12. The method of claim 11,
The curved portion is bent in a short side direction and a long side direction of the display panel, and
The vibration generating device is disposed on the left and right sides of the curved portion in the short side direction and above and below the curved surface portion in the long side direction, respectively. 12. The method of claim 11,
The curved portion is bent in a long side direction of the display panel, and the vibration generating device is disposed above and below the long side curved portion, respectively.

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