KR102386650B1 - Electronic apparatus - Google Patents

Abstract

The present application provides an electronic device capable of outputting a sound to the front of a display panel through vibration of a display module while being lightweight and slim, and the electronic device according to the present application includes a display module that displays an image, and a display module of the display module. A rear cover covering a rear surface, a first vibration generating device for vibrating the display module, and a second vibration generating device for vibrating the rear cover, wherein the area of the first vibration generating device is smaller than the area of the second vibration generating device.

Description

Electronic device {ELECTRONIC APPARATUS}

This application relates to an electronic device.

In general, an electronic device such as a television, a monitor, a notebook computer, a smart phone, a tablet computer, an electronic pad, a wearable device, a watch phone, a portable information device, a navigation device, or a vehicle control display device is a display device for displaying an image and an image and a sound device for outputting a sound related to the .

While screens of recent electronic devices tend to be enlarged, demands for weight reduction and slimness are increasing.

However, since the electronic device must have sufficient space to accommodate a sound device such as a speaker for sound output, it is difficult to reduce the weight and size. In addition, since the sound generated by the sound device built into the electronic device is output toward the rear or side of the main body of the electronic device rather than the front of the display panel, do not proceed toward the viewer (or user) watching the image from the front of the display panel. For this reason, there is a problem that prevents the immersion of the viewer watching the video.

An object of the present application is to provide an electronic device capable of outputting a sound to the front of a display panel through vibration of a display module while being lightweight and slim.

An electronic device according to the present application includes a display module displaying an image, a rear cover covering the rear surface of the display module, a first vibration generating device vibrating the display module, and a second vibration generating device vibrating the rear cover, The area of the first vibration generating device is smaller than the area of the second vibration generating device.

An electronic device according to the present application provides a first display module for displaying an image, a second display module disposed on a rear surface of the first display module, a first vibration generator for vibrating the first display module, and a vibration for the second display module and a second vibration generating device, wherein an area of the first vibration generating device is smaller than an area of the second vibration generating device.

The present application may enable weight reduction and slimming of an electronic device by outputting a sound to the front of the display panel through vibration of the display module.

And, according to the present application, the characteristics of the low frequency sound pressure can be improved and the size of the sound pressure can be increased through the first vibration generating device and the second vibration generating device.

And, the present application can improve the characteristics of the low-frequency sound pressure and the high-frequency sound pressure by providing the vibration transmission member, and can increase the sound pressure.

In addition to the effects of the present application mentioned above, other features and advantages of the present application will be described below or will be clearly understood by those of ordinary skill in the art to which this application belongs from the description and description.

1 is a cross-sectional view of an electronic device according to a first embodiment of the present application.
FIG. 2 is a cross-sectional view of the electronic device additionally provided with a vibration transmitting member in FIG. 1 .
3 is a cross-sectional view of an electronic device according to a second embodiment of the present application.
FIG. 4 is a cross-sectional view of the electronic device additionally provided with a vibration transmitting member in FIG. 3 .
5 is a graph illustrating sound output characteristics of an electronic device according to an example of the present application.

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

The shape, size, ratio, angle, number, etc. disclosed in the drawings for explaining an example of the present application are exemplary, and thus the present application is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present application, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present application, the detailed description thereof will be omitted.

When 'including', 'having', 'consisting', 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, it is construed as including an error range even if there is no separate explicit description.

In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between two parts unless 'directly' is used.

In the case of a description of a temporal relationship, for example, 'immediately' or 'directly' when a temporal relationship is described with 'after', 'following', 'after', 'before', etc. This includes cases that are not continuous unless this is used.

Although the first, second, etc. are used to describe various elements, these elements 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 application.

"First horizontal axis direction", "second horizontal axis direction" and "vertical axis direction" should not be construed only as a geometric relationship in which the relationship between each other is vertical, and the range in which the configuration of the present application can function functionally It may mean to have a broader direction than within.

The term “at least one” should be understood to include all possible combinations of one or more related items. For example, the meaning of “at least one of the first, second, and third items” means that each of the first, second, or third items as well as two of the first, second and third items It may mean a combination of all items that can be presented from more than one.

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

Hereinafter, a preferred example of an electronic device according to the present application will be described in detail with reference to the accompanying drawings. In adding reference numerals to the components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated on different drawings.

1 is a cross-sectional view of an electronic device according to a first embodiment of the present application.

Referring to FIG. 1 , the electronic device according to the first embodiment of the present application includes a display module 100 , a housing 300 , a rear cover 400 , and a vibration generating device 500 .

The display module 100 includes a display panel 110 .

The display panel 110 may be a light emitting display panel or a flexible light emitting display panel. The display panel 110 according to an example may be formed of a material having high rigidity. The vibration generating device 500 may be disposed on the rear surface of the display panel 110 . Since the display panel 111 is made of a material with high rigidity, there is a problem in that the sound pressure is lowered at low frequencies. Accordingly, the inventors of the present specification conducted various experiments to improve the sound at low frequencies. Through several experiments, a display device with a new structure that can improve sound at low frequencies was invented. This will be described below.

In addition, the display panel 110 includes a pixel array substrate having a pixel array including a plurality of pixels, and an encapsulation layer encapsulating the pixel array.

Each of the plurality of pixels is provided in a pixel area defined by pixel driving lines. In addition, each of the plurality of pixels includes a pixel circuit including at least two thin film transistors and at least one capacitor, and a light emitting device that emits light by current supplied from the pixel circuit. As an example, the light emitting device includes an organic light emitting layer or a quantum dot light emitting layer. As another example, the light emitting device includes a micro light emitting diode.

The encapsulation layer protects the thin film transistor and the light emitting device from external impact, and prevents moisture from penetrating into the light emitting device. In addition, the encapsulation layer may be replaced with an encapsulation substrate attached to the pixel array substrate through a filler surrounding the pixel array. When the filler is formed of a transparent filler, the encapsulation substrate may be a transparent encapsulation substrate.

The display module 100 according to an example of the present application further includes a touch panel 130 . The touch panel 130 is provided on the display panel 110 and includes a touch electrode layer having a touch electrode for sensing a user's touch on the display module 100 . The touch electrode layer senses a change in capacitance of the touch electrode according to a user's touch. For example, the touch electrode layer includes a touch electrode for sensing a user's touch according to a mutual capacitance method or a self-capacitance method.

The display module 100 according to an example of the present application further includes a polarizing film 150 disposed on the touch panel 130 . The polarizing film 150 is attached to the upper surface of the touch panel 130 through a film attachment member. The polarizing film serves to improve the visibility and contrast ratio of the display panel 110 by changing the external light reflected by the thin film transistor and/or pixel driving lines provided on the pixel array substrate to a circularly polarized state. In addition, the polarizing film 150 may be disposed between the encapsulation layer of the display panel 110 and the touch panel 130 .

In addition, the display module 100 further includes a barrier layer interposed between the encapsulation layer of the display panel 110 and the touch panel 130 . The barrier layer may serve to prevent moisture or the like from penetrating toward the pixel array.

In addition, the display module 100 may further include a color filter layer provided on the upper surface of the encapsulation layer of the display panel 110 . The color filter layer is provided to overlap each of the plurality of pixels, and includes a color filter that transmits only a wavelength of a color set in each of the plurality of pixels.

The housing 300 surrounds one of the rear and side surfaces of the display module 100 . For example, the housing 300 may surround the rear surface and side surfaces of the display module 100 by accommodating the display module 100 . The housing 300 according to an example includes a housing bottom 310 and a housing sidewall 330 .

The housing bottom 310 is disposed on the rear surface of the display module 100 to cover the rear surface of the display module 100 .

The housing side wall part 330 is formed in a frame shape to have a display receiving space in which the display module 100 is accommodated, and surrounds each side of the display module 100 . The housing side wall part 330 is vertically connected to each outer wall of the housing bottom part 310 . For example, a cross-section between the housing side wall part 330 and each outer wall of the housing bottom part 310 may have a "ㅓ" or "A"-shaped cross-section depending on the position of the cross-section. The housing side wall part 330 is formed in a frame shape to have a display accommodation space in which the display module 100 is accommodated, and surrounds each side of the display module 100 .

The housing side wall part 330 according to an example provides a storage space for accommodating the display module 100 on the front surface of the housing bottom part 310 , and is driven on the rear surface of the housing bottom part 310 . A circuit accommodation space for accommodating a circuit configuration of the circuit unit 600 and the like and peripheral circuits of an electronic device including a battery may be provided.

The rear cover 400 is coupled to the housing 300 to cover the rear surface of the housing 300 . For example, the rear cover 400 covers the circuit accommodation space provided on the rear surface of the housing 300 .

The rear cover 400 according to an example may be coupled to the lower stepped portion 370 provided on the housing side wall portion 330 of the housing 300 . The rear cover 400 may be formed of a material having low rigidity. The rear cover 400 may be formed to have less rigidity than the display panel 110 and the display module 100 including the same. For example, the rear cover 400 may be formed of a plastic-based material having low rigidity, but is not limited thereto.

The electronic device according to the present application may effectively output sounds in the middle and low frequency bands by forming different rigidity of the display module 100 and the rear cover 400 . For example, the display panel 110 and the display module 100 including the same may be formed of a material having high rigidity favorable to medium and high frequency sound pressure generation, and the rear cover 400 may be formed of a material having low rigidity advantageous to low frequency sound pressure generation. can be formed with Therefore, by outputting the sound of the middle frequency band through the display module 100 and outputting the sound of the low frequency band through the rear cover 400 , it is possible to effectively output the sound of the middle frequency and the low frequency band, respectively. Here, the sound output through the display module 100 can be viewed as a sound of a first frequency band, the sound output through the rear cover 400 can be viewed as a sound of a second frequency band, and the sound of the first frequency band is a mid-range sound, The sound of the second frequency band may be regarded as a low tone.

The vibration generating device 500 is disposed on the rear surface of the display module 100 and on the front surface of the rear cover 400 . The vibration generating device 500 according to an example includes a first vibration generating device 510 and a second vibration generating device 520 .

The first vibration generating device 510 is disposed on the rear surface of the display module 100 , for example, on the rear surface of the display panel 110 . The first vibration generating device 510 is attached to the rear surface of the display panel 110 through an adhesive member. The first vibration generating device 510 may output a sound in the forward direction Z of the display panel 110 by vibrating the display module 100 according to the vibration driving signal.

The second vibration generating device 520 is disposed on the front side of the rear cover 400 . The second vibration generating device 520 is attached to the front surface of the rear cover 400 through an adhesive member. The second vibration generating device 520 may output a sound in the rear direction (-Z) of the rear cover 400 by vibrating the rear cover 400 according to the vibration driving signal.

The adhesive member may be a double-sided tape or a naturally curable adhesive, but is not limited thereto.

The first vibration generating device 510 and the second vibration generating device 520 according to an example include a vibration generating element.

The vibration generating element includes a piezoelectric material layer having a piezoelectric effect, a first electrode disposed on the front surface of the piezoelectric material layer, and a second electrode disposed on the rear surface of the piezoelectric material layer. Here, since the vibration generating element includes a piezoelectric material layer, it may be expressed as a piezoelectric element.

The piezoelectric material layer includes a piezoelectric material generating vibration by an electric field. Here, in the piezoelectric 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 phenomenon is applied to the crystal structure by an external force, and vice versa according to the applied voltage It has a characteristic that vibration is generated by an electric field.

The vibration generating element according to an embodiment includes a piezoelectric material of a polymer material, a piezoelectric material of a thin film material, a piezoelectric material of a composite material, or a piezoelectric material of a single crystal ceramic or a polycrystalline ceramic. In the present application, the piezoelectric material of the polymer material includes PVDF (polyvinylidene difluoride), P(VDF-TrFe), or P(VDFTeFE). The piezoelectric material of the thin film material includes ZnO, CdS, or AlN. The piezoelectric material of the composite material includes PZT (lead zirconate titanate)-PVDF, PZT-Silicon Rubber, PZT-Epoxy, PZT-foamed polymer, or PZT-foamed urethane. The piezoelectric material of the single crystal ceramic includes ?-AlPO4, ?-SiO2, LiNbO3, Tb2(MoO4)3, Li2B4O7, or ZnO. The piezoelectric material of the polycrystalline ceramic includes PZT-based, PT-based, PZT-Complex Perovskite-based, or BaTiO3.

The first electrode and the second electrode are provided to overlap each other with a piezoelectric material layer therebetween. The first electrode and the second electrode may be formed of an opaque metal material having relatively low resistance and excellent heat dissipation characteristics, but are not limited thereto, and may be formed of a transparent conductive material or a conductive polymer material.

The first vibration generating device 510 according to an example may be formed to have a smaller area than the second vibration generating device 520 . Here, the first vibration generating device 510 is coupled to the display panel 110 , and the second vibration generating device 520 is coupled to the rear cover 400 . Since the display panel 110 may be formed of a material having high rigidity, it is advantageous for generating medium and high frequency sound pressure. In addition, when the area of the first vibration generating device 510 is reduced, the vibration speed of the first vibration generating device 510 increases and the vibration speed of the display panel 110 increases, so that the sound of the middle and high frequency band is effectively output. can And, since the rear cover 400 may be formed of a material with low rigidity, it is advantageous for low-frequency sound pressure generation. In addition, if the area of the second vibration generating device 520 is increased, the vibration area of the rear cover 400 is increased to effectively output a sound in a low frequency band. And, since the sound of the low frequency band of the second vibration generating device 520 has omnidirectional directivity, even if the sound is generated in the opposite direction of the display panel 110 , the sound is directed in the front direction (Z) of the display panel 110 . This can be diffracted and propagated.

The first vibration generating device 510 may be formed to have a small area, and the vibration generating element included in the first vibration generating device 510 may also be formed to have a small area. Since the vibration generating element may be made of a high-cost and high-power piezoelectric element, manufacturing cost and power consumption may be reduced by forming a small area of the vibration generating element.

The electronic device according to the present application may output a sound of a middle and high frequency band from the front of the display module 100 and may output a sound of a low frequency band from the rear of the rear cover 400 . For example, a sound of a middle and high frequency band may be output from the front of the display panel 110 , and a sound of a low frequency band may be output from the rear of the display panel 110 . Since the display panel 110 outputs the image in the front direction, the sound of the high frequency band with high straightness is output in the same direction as the image to reach the viewer. In addition, the sound of the low frequency band having high diffraction may be output in the rear direction of the display panel 110 , but may be diffracted in the front direction of the display panel 110 and output in the front direction of the display panel 110 . Accordingly, the sound in the low frequency band may also be output in the same direction as the image to reach the viewer.

Since the electronic device according to the present application can effectively output each of the sound of the middle frequency band and the sound of the low frequency band, it can have an improved sound pressure compared to an electronic device that outputs a sound through one panel.

The electronic device according to an example of the present application further includes a driving circuit unit 600 and a cover window 700 .

The driving circuit unit 600 is disposed in a circuit accommodation space provided in the housing 300 , and is connected to the display panel 110 and the vibration generating device 500 . The driving circuit unit 600 includes a panel driving circuit and a sound processing circuit.

The panel driving circuit is mounted on the display panel 110 or a circuit board to display an image on the display panel 110 . The panel driving circuit is connected to a pad portion provided on the pixel array substrate of the display panel 110 and supplies driving signals and data signals to the pixel driving lines to display an image in each pixel.

The sound processing circuit generates an audio signal based on an audio source, amplifies the audio signal to generate a vibration driving signal, and vibrates the vibration generating device 500 according to the generated vibration driving signal.

The cover window 700 is coupled to the housing 300 to support the display module 100 . For example, the cover window 700 may be supported by the upper stepped portion 360 provided on the housing sidewall portion 330 of the housing 300 while supporting the display module 100 .

The cover window 700 according to an example may be made of glass or a reinforced glass material. For example, the cover window 700 may have any one of sapphire glass and gorilla glass or a bonding structure thereof. The cover window 700 may be attached to the front surface of the display module 100 through an optical adhesive member. In this case, the optical adhesive member may be OCA (Optically Clear Adhesive), OCR (Optically Clear Resin), or PSA (Pressure Sensitive Adhesive).

The buffer member 200 may be interposed between the cover window 700 and the upper stepped portion 360 provided on the housing side wall portion 330 of the housing 300 . The buffer member 200 includes a double-sided tape or a foam pad. The buffer member 200 may buffer the impact applied to the cover window 700 , prevent the vibration of the display module 100 from being transmitted to the housing 300 , and enable the vibration of the display module 100 . there is.

Accordingly, in the electronic device according to an example of the present application, the display module 100 , for example, the display panel 110 vibrates according to the driving of the vibration generating device 500 , so that the display panel 110 vibrates. The generated sound may be output to the viewer (or user) who views the image from the front of the display panel 110 . Accordingly, according to an example of the present application, the electronic device outputs sound toward the viewer through the vibration of the display module 100 without a separate sound device or speaker, thereby increasing the viewer's immersion in viewing an image, reducing weight and / or can be slimmed down.

And, by having a dual structure in which the first vibration generating device 510 and the second vibration generating device 520 are provided on the rear surface of the display module 100 and the front surface of the rear cover 400, respectively, low-frequency sound pressure or medium-high frequency It is possible to improve the characteristics of sound pressure and increase the size of the sound pressure.

FIG. 2 is a cross-sectional view of the electronic device additionally provided with a vibration transmitting member in FIG. 1 . In FIG. 2 , except for the vibration transmitting member, the rest of the configuration is the same as in FIG. 1 , so the overlapping description will be omitted.

Referring to FIG. 2 , an electronic device according to an example of the present application includes a vibration transmitting member 800 .

The vibration transmitting member 800 is disposed between the first vibration generating device 510 and the second vibration generating device 520 . For example, the vibration transmitting member 800 may directly contact each of the first vibration generating device 510 and the second vibration generating device 520 , and may reduce the vibration generated by the first vibration generating device 510 . The second vibration generating device 520 may be transmitted or the vibration generated in the second vibration generating device 520 may be transmitted to the first vibration generating device 510 .

The vibration transmitting member 800 according to an example may be formed of a material having high rigidity. Since the vibration transmitting member 800 has a higher rigidity, the higher the vibration transmitting power, the first vibration generating device 510 and the second vibration generating device 520 generate when the vibration transmitting member 800 is formed of a material having high rigidity. It is advantageous to transmit the vibration.

The vibration transmitting member 800 according to an example may improve both low-frequency sound pressure and medium-high frequency sound pressure. The vibration transmitting member 800 may transmit the vibration generated from the first vibration generating device 510 to the rear cover 400 through the second vibration generating device 520 , and generated by the second vibration generating device 520 . Since the oscillation can be transmitted to the display module 100 through the first vibration generating device 510 , it is possible to have a two-degree-of-freedom free vibration system. This two-DOF free vibration system can be viewed as a structure in which two vibration generators are connected in parallel to one object, and in the two-DOF free vibration system, the resonant frequency is lower than the low frequency and higher than the high frequency. In this way, since a two-degree-of-freedom system free vibration system can be implemented through the vibration transmitting member 800 , the sound of the high frequency band improved from the sound of the first frequency band and the sound of the low frequency band improved from the sound of the second frequency band can be printed out. For example, it is possible to improve the sound pressure of the high frequency band of 500 Hz or more and the sound pressure of the low frequency band of 500 Hz or less.

3 is a cross-sectional view of an electronic device according to a second exemplary embodiment of the present application, and FIG. 4 is a cross-sectional view of the electronic device additionally provided with a vibration transmitting member in FIG. 3 . In FIGS. 3 and 4 , the same reference numerals are assigned to the components overlapping those of FIGS. 1 and 2 , and overlapping descriptions thereof will be omitted.

3 and 4 , the electronic device according to the second exemplary embodiment of the present application includes a first display module 100a, a second display module 100b, a first cover window 700a, and a second cover window ( 700b).

Since the first display module 100a is the same as the above-described display module 100, a redundant description thereof will be omitted.

The second display module 100b is provided to be symmetrical with the first display module 100a with the first and second vibration generating devices 510 and 520 interposed therebetween, and is configured except for the second display panel 110b. is the same as that of the first display module 100a.

The second display panel 110b may be formed of a material having less rigidity than that of the first display panel 110a. For example, the second display panel 110b may be formed of a plastic-based material having low rigidity. Accordingly, the rigidity of the second display module 100b including the second display panel 110b may be smaller than that of the first display module 100a including the first display panel 110a.

Since the first cover window 700a is the same as the above-described cover window 700, a redundant description thereof will be omitted.

The second cover window 700b is coupled to the housing 300 to support the second display module 100b. For example, the second cover window 700b may be supported by the lower step portion 370 provided on the housing sidewall portion 330 of the housing 300 while supporting the second display module 100b.

Between the first cover window 700a and the upper stepped portion 360 provided on the housing sidewall 330, and between the second cover window 700b and the lower stepped portion 370 provided on the housing sidewall 330, a buffer is provided. The member 200 may be interposed. The buffer member 200 includes a double-sided tape or a foam pad. The buffer member 200 cushions the impact applied to the first and second cover windows 700a and 700b and prevents the vibrations of the first and second display modules 100a and 100b from being transmitted to the housing 300 . and enables vibration of the first and second display modules 100a and 100b.

The electronic device according to the present application may include a first display module 100a and a second display module 100b to enable interactive image output. In addition, the first display module 100a outputs a sound of a high frequency band from the front side, and outputs a sound of a low frequency band from the rear side of the second display module 100b, so as to output a two-way image together with different frequency bands in both directions. It can output sound. As described above, since the electronic device according to the present application includes the first and second display modules 100a and 100b on the front and rear surfaces of the electronic device, it is possible to implement an interactive image with low power, and sound of different frequency bands in both directions By outputting , it is possible to provide an electronic device that covers the sound of the high and low frequency band in the front direction of the first display module 100a and the sound of the low frequency band in the rear direction of the second display module 100b.

Since the electronic device according to the present application can effectively output each of a sound in a high frequency band and a sound in a low frequency band, it can have an improved sound pressure compared to an electronic device that outputs a sound through one panel.

5 is a graph illustrating acoustic characteristics of an electronic device according to an example of the present application. In FIG. 5 , graph A shows the acoustic characteristics of an electronic device having a vibration generating device attached to the display panel, and graph B shows the acoustic characteristics of the electronic device of FIG. 1 , which is an example of the present application.

Referring to FIG. 5 , an electronic device as shown in graph B includes a first vibration generating device 510 and a second vibration generating device 520 to improve low frequency sound pressure, so as to have one vibration generating device as shown in graph A It can be seen that the sound pressure increases in the low frequency band compared to one electronic device. For example, in the graph, it can be seen that the sound pressure in the low frequency band of 500 Hz or less is improved. As described above, it can be seen that the sound of the low frequency band is improved through the second vibration generating device 520 . In addition, the sound of the high frequency band, for example, the sound pressure of the high frequency region of 1000 Hz or more, may be improved through the vibration transmitting member 800 .

And, the sound generating device according to the embodiment of the present application may be applied to the sound generating device disposed on the 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 device, a foldable device, and a rollable device. device), bendable device, flexible device, curved device, electronic notebook, e-book, portable multimedia player (PMP), personal digital assistant (PDA), MP3 player, mobile Medical equipment, desktop PC, laptop PC, netbook computer, workstation, navigation, vehicle navigation, vehicle display, television, wallpaper display, notebook , monitors, cameras, camcorders, and home appliances. And, when applied to a mobile device, it may be applied to at least one of a receiver and a speaker.

Features, structures, effects, etc. described in the above-described examples of the present application are included in at least one example of the present application, and are not necessarily limited to only one example. Furthermore, features, structures, effects, etc. illustrated in at least one example of the present application may be combined or modified with respect to other examples by those of ordinary skill in the art to which the present application belongs. Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present application.

In an example of the present application, the electronic device includes a display module displaying an image, a rear cover covering the rear surface of the display module, a first vibration generating device vibrating the display module, and a second vibration generating device vibrating the rear cover, , the area of the first vibration generating device is smaller than the area of the second vibration generating device.

In an example of the present application, the first and second vibration generating devices may include a vibration generating element.

In an example of the present application, the vibration generating element may be a piezoelectric element.

In an example of the present application, the rigidity of the back cover may be smaller than that of the display module.

In an example of the present application, the electronic device may further include a vibration transmitting member provided between the first vibration generating device and the second vibration generating device.

In an example of the present application, the display module may output a sound of a first frequency band, and the rear cover may output a sound of a second frequency band.

In an example of the present application, the sound of the first frequency band may be a mid-range sound, and the sound of the second frequency band may be a low-pitched sound.

In an example of the present application, the electronic device includes a first display module for displaying an image, a second display module disposed on the rear side of the first display module, a first vibration generating device for vibrating the first display module, and a second display module and a second vibration generating device that vibrates the , wherein an area of the first vibration generating device is smaller than an area of the second vibration generating device.

In an example of the present application, the first and second vibration generating devices may include a vibration generating element.

In an example of the present application, the vibration generating element may be a piezoelectric element.

In an example of the present application, the rigidity of the second display module may be smaller than that of the first display module.

In an example of the present application, the electronic device may further include a vibration transmitting member provided between the first vibration generating device and the second vibration generating device.

In an example of the present application, the first display module may output a sound of a first frequency band, and the second display module may output a sound of a second frequency band.

In an example of the present application, the sound of the first frequency band may be a mid-range sound, and the sound of the second frequency band may be a low-pitched sound.

The present application described above is not limited to the above-described embodiment and the accompanying drawings, and it is common in the technical field to which this application belongs that various substitutions, modifications and changes are possible within the scope not departing from the technical matters of the present application. It will be clear to those who have the knowledge of Therefore, the scope of the present application is indicated by the following claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present application.

100: display module 110: display panel
200: cushioning member 300: housing
400: rear cover 500: vibration generating device
600: driving circuit unit 700: cover window
800: vibration transmission member

Claims (14)

a display module for displaying an image;
a rear cover covering the rear surface of the display module;
a first vibration generating device coupled to the display module to vibrate the display module; and
and a second vibration generating device coupled to the rear cover to vibrate the rear cover,
and an area of the first vibration generating device is smaller than an area of the second vibration generating device. The method of claim 1,
and the first and second vibration generating devices include vibration generating elements. 3. The method of claim 2,
The vibration generating element is a piezoelectric element, an electronic device. The method of claim 1,
The rigidity of the back cover is less than that of the display module, the electronic device. The method of claim 1,
The electronic device further comprising a vibration transmitting member provided between the first vibration generating device and the second vibration generating device. The method of claim 1,
The display module outputs a sound of a first frequency band, and the rear cover outputs a sound of a second frequency band. 7. The method of claim 6,
The sound of the first frequency band is a mid-range sound, and the sound of the second frequency band is a low-pitched sound. a first display module for displaying an image;
a second display module disposed on a rear surface of the first display module;
a first vibration generating device coupled to the first display module to vibrate the first display module; and
a second vibration generating device coupled to the second display module to vibrate the second display module;
and an area of the first vibration generating device is smaller than an area of the second vibration generating device. 9. The method of claim 8,
and the first and second vibration generating devices include vibration generating elements. 10. The method of claim 9,
The vibration generating element is a piezoelectric element, an electronic device. 9. The method of claim 8,
and a rigidity of the second display module is smaller than a rigidity of the first display module. 9. The method of claim 8,
The electronic device further comprising a vibration transmitting member provided between the first vibration generating device and the second vibration generating device. 9. The method of claim 8,
The first display module outputs a sound of a first frequency band, and the second display module outputs a sound of a second frequency band. 14. The method of claim 13,
The sound of the first frequency band is a mid-range sound, and the sound of the second frequency band is a low-pitched sound.

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