KR102606085B1 - Electronic apparatus - Google Patents

Abstract

The present application provides an electronic device that can be lightweight and slim while outputting sound to the front of the display panel through vibration of the display module. The electronic device according to the present application provides sound that vibrates the display module that displays the image. It includes a generating device, and the sound generating device may include a tuning fork member attached to the rear of the display module and a vibration generating element attached to the tuning fork member.

Description

Electronic device{ELECTRONIC APPARATUS}

This application relates to electronic devices.

In general, electronic devices such as televisions, monitors, laptop computers, smart phones, tablet computers, electronic pads, wearable devices, watch phones, portable information devices, navigation, or vehicle control display devices are display devices that display images and images. Includes an audio device for outputting sounds related to.

While recent electronic devices tend to have larger screens, demands for lighter and slimmer devices are increasing.

However, electronic devices have difficulty in reducing weight and miniaturization because they must have sufficient space to accommodate sound devices such as speakers for sound output. Additionally, the sound generated from the sound device built into the electronic device is output toward the back or side of the electronic device body rather than the front of the display panel, so it should not be directed toward the viewer (or user) watching the video from the front of the display panel. Therefore, there is a problem that hinders the immersion of viewers watching the video.

The technical task of this application is to provide an electronic device that can be lightweight and slim while outputting sound to the front of the display panel through vibration of the display module.

The electronic device according to the present application includes a display module that displays an image, a housing surrounding one of the back and sides of the display module, and a sound generating device that vibrates the display module, and the sound generating device is attached to the back of the display module. It may include a tuning fork member and a vibration generating element attached to the tuning fork member.

The present application can make electronic devices lighter and slimmer by outputting sound to the front of the display panel through the vibration of the display module.

In addition, the present application can improve the sound characteristics delivered to the user by simultaneously outputting sound due to the vibration of the display module and sound due to the self-vibration of the sound generating device.

In addition to the effects of the present application mentioned above, other features and advantages of the present application are described below, or can be clearly understood by those skilled in the art from such description and description.

1 is a perspective view showing an electronic device according to an example of the present application.
FIG. 2 is a cross-sectional view taken along line II' shown in FIG. 1.
FIG. 3 is a rear view of the display panel shown in FIG. 1.
Figures 4 to 6 are perspective views for explaining examples of tuning fork members shown in Figure 2.
Figure 7 is a perspective view showing an electronic device according to another example of the present application.
FIG. 8 is a cross-sectional view taken along line II-II' shown in FIG. 7.
FIG. 9 is a rear view of the display panel shown in FIG. 8.
Figure 10a is a diagram showing the vibration frequency characteristics of a tuning fork member according to a comparative example.
Figure 10b is a diagram showing the vibration frequency characteristics of a tuning fork member according to an example of the present application.
FIG. 11A is a graph showing the vibration speed of the tuning fork member according to the comparative example shown in FIG. 10A.
FIG. 11B is a graph showing the vibration speed of the tuning fork member according to the example of the present application shown in FIG. 10B.
Figure 12 is a graph showing acoustic characteristics according to the presence or absence of an acoustic side discharge part in an electronic device according to an example of the present application.

The advantages and features of the present application and methods for achieving them will become clear by referring to examples described in detail below along with the accompanying drawings. However, the present application is not limited to the examples disclosed below and will be implemented in various different forms, and only the examples of the present application ensure that the disclosure of the present application is complete, and are commonly used in the technical field to which the invention of the present application pertains. It is provided to fully inform those with knowledge of the scope of the invention, and the invention of this 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 illustrative, and the present application is not limited to the matters shown. Like reference numerals refer to like elements throughout the specification. Additionally, in describing examples of the present application, if it is determined that detailed descriptions of related known technologies may unnecessarily obscure the gist of the present application, the detailed descriptions will be omitted.

When 'includes', 'has', 'consists 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 plural is included unless specifically stated otherwise.

When interpreting a component, it is interpreted to include the margin of error even if there is no separate explicit description.

In the case of a description of a positional relationship, for example, if the positional relationship of two parts is described as 'on top', 'on the top', 'on the bottom', 'next to', etc., 'immediately' Alternatively, there may be one or more other parts placed between the two parts, unless 'directly' is used.

In the case of a description of a temporal relationship, for example, if a temporal relationship is described as 'after', 'successfully after', 'after', 'before', etc., 'immediately' or 'directly' Unless used, non-consecutive cases may also be included.

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

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

Each feature of the various examples of the present application can be combined or combined with each other partially or entirely, and various technological interconnections and operations are possible, and each example can be implemented independently of each other or together in a related relationship. .

Hereinafter, examples of electronic devices according to the present application will be described in detail with reference to the attached drawings. In adding reference numerals to components in each drawing, identical components may have the same reference numerals as much as possible even if they are shown in different drawings. Additionally, when describing examples of the present application, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present application, the detailed description may be omitted.

FIG. 1 is a perspective view showing an electronic device according to an example of the present application, FIG. 2 is a cross-sectional view taken along line II' shown in FIG. 1, and FIG. 3 is a rear view of the display panel shown in FIG. 1.

Referring to FIGS. 1 to 3 , an electronic device according to an example of the present application may include a display module 100, a housing 300, and a sound generating device 500.

The display module 100 may include 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 one example may include a pixel array substrate having a pixel array composed of a plurality of pixels, and an encapsulation layer that encapsulates the pixel array.

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

The encapsulation layer protects the thin film transistor and light emitting device from external shock and prevents moisture from penetrating into the light emitting device. Additionally, the encapsulation layer may be replaced with an encapsulation substrate attached to the pixel array substrate via a filler material 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 may further include 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 changes in capacitance of the touch electrode according to the 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 may further include 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 via a film attachment member. The polarizing film serves to improve the visibility and contrast ratio of the display panel 110 by changing external light reflected by thin film transistors and/or pixel driving lines provided on the pixel array substrate into a circularly polarized state. Additionally, the polarizing film 150 may be disposed between the encapsulation layer of the display panel 110 and the touch panel 130.

Additionally, the display module 100 may further include 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, etc. from penetrating into the pixel array.

Additionally, 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 may include a color filter that transmits only the wavelength of the color set to each of the plurality of pixels.

The housing 300 surrounds one of the rear and sides of the display module 100. For example, the housing 300 may accommodate the display module 100 and surround the rear and sides of the display module 100. The housing 300 according to one example may include a housing bottom portion 310 and a housing side wall portion 330.

The housing bottom 310 is disposed at the rear of the display module 100 and covers the rear of the display module 100.

The housing side wall portion 330 is formed in a frame shape to have a display storage space in which the display module 100 is accommodated, and surrounds each side of the display module 100. The housing side wall portion 330 is vertically connected to each outer wall of the housing bottom portion 310. For example, the cross section between each outer wall of the housing side wall 330 and the housing bottom 310 may have a cross section in the shape of a " ┤ " or a "┣" shape depending on the position of the cross section. The housing side wall portion 330 is formed in a frame shape to have a display storage space in which the display module 100 is accommodated, and surrounds each side of the display module 100.

The housing side wall portion 330 according to one example may include first to fourth housing side walls 331, 332, 333, and 334. The first to fourth housing side walls 331, 332, 333, and 334 according to an example provide a storage space for storing the display module 100 on the front of the housing bottom 310, and the housing A circuit storage space may be provided on the rear of the bottom 310 for storing circuit components such as a driving circuit unit and peripheral circuits of an electronic device including a battery.

The first housing side wall 331 may be vertically coupled to the first side (or first long side) of the housing bottom 310 so as to be parallel to the first longitudinal direction (X) of the electronic device. The first housing side wall 331 surrounds the first side of the display module 100.

The second housing side wall 332 may be vertically coupled to the second side (or second long side) of the housing bottom 310 so as to be parallel to the first housing side wall 331. The second housing side wall 332 surrounds the second side of the display module 100.

The third housing side wall 333 is perpendicular to the third side (or first short side) of the housing bottom 310 so as to be parallel to the second longitudinal direction (Y) that intersects the second longitudinal direction (Y) of the electronic device. can be combined. The third housing side wall 333 surrounds the third side of the display module 100.

The fourth housing side wall 334 may be vertically coupled to the fourth side (or second short side) of the housing bottom 310 so as to be parallel with the third housing side wall 333. The fourth housing side wall 334 surrounds the fourth side of the display module 100.

The sound generating device 500 is coupled to the rear of the display module 100, for example, the rear of the display panel 110, and causes the display module 100 to vibrate according to a vibration drive signal, thereby causing vibration of the display panel 110. Accordingly, sound is output in the front direction (Z) of the display panel 110. The sound generating device 500 according to one example may include first and second vibration generating modules 510 and 530 coupled to the rear of the display module 100, for example, the rear of the display panel 110. .

The first vibration generating module 510 vibrates the first rear area A1 of the display module 100 according to a vibration driving signal provided from the driving circuit unit. Here, the first rear area (A1) is the middle portion (CP) (or rear middle portion) of the display module 100 based on the first longitudinal direction (or long side direction) (X) of the display module 100. It may be defined as an area between one end 110a of the display module 100. For example, the first rear area A1 may be defined as one edge area (or right edge area) of the display module 100 based on the longitudinal direction (or long side direction) (X) of the display module 100. You can.

The first vibration generation module 510 according to an example is attached (or coupled) to the first rear area A1 of the display panel 110 via the first adhesive member 501. The longitudinal direction of the first vibration generating module 510 may be parallel to the longitudinal direction (X) of the display module 100. The first adhesive member 501 according to one example may be a double-sided tape or a natural curing adhesive.

The second vibration generating module 530 vibrates the second rear area A2 of the display module 100 according to a vibration driving signal provided from the driving circuit unit. Here, the second rear area (A2) is the middle portion (CP) of the display module 100 and the other end of the display module 100, based on the longitudinal direction (or long side direction) (X) of the display module 100. It can be defined as the area between (110b). For example, the second rear area A2 may be defined as the other edge area (or left edge area) of the display module 100 based on the longitudinal direction (or long side direction) (X) of the display module 100. You can.

The second vibration generation module 530 according to an example is attached (or coupled) to the second rear area A2 of the display panel 110 via the second adhesive member 503. The longitudinal direction of the second vibration generating module 530 may be parallel to the longitudinal direction (X) of the display module 100. The second vibration generation module 530 may be arranged to be symmetrical to the first vibration generation module 510 with respect to the middle portion CP of the display module 100. The second adhesive member 503 according to one example may be a double-sided tape or a natural curing adhesive, or may be the same as the first adhesive member 501.

Each of the first and second vibration generating modules 510 and 530 according to an example may include a tuning fork member 520 and a vibration generating element 525.

The tuning fork member 520 of each of the first and second vibration generating modules 510 and 530 is attached to the rear of the corresponding display panel 110 via the corresponding adhesive members 501 and 503, and generates vibration. Supports element 525. The tuning fork member 520 according to one example may be a cantilever structure having a “⊂” or “⊃” shaped cross section parallel to the longitudinal direction (X) of the display module 100. This tuning fork member 520 transmits the vibration generated by the driving of the vibration generating element 525 to the display panel 110, thereby causing the display panel 110 to vibrate according to the driving of the vibration generating element 525.

The vibration generating element 525 of each of the first and second vibration generating modules 510 and 530 is coupled (or attached) to the corresponding tuning fork member 520. The vibration generating element 525 may be attached to the rear of the tuning fork member 520 facing the housing bottom 310 of the housing 300 via a vibration element adhesive member. For example, the vibrating element adhesive member may be a double-sided tape or a natural curing adhesive. Here, the vibrating element adhesive member may be made of a thermosetting adhesive or a photocuring adhesive, but in this case, the characteristics of the vibration generating module may deteriorate due to the heat of the adhesive curing process, so it may be made of a double-sided tape or a naturally curing adhesive.

The vibration generating element 525 according to one example may include a piezoelectric material layer having a piezoelectric effect, a first electrode disposed on the front side of the piezoelectric material layer, and a second electrode disposed on the back side of the piezoelectric material layer. You can. Here, since the vibration generating element 525 includes a piezoelectric material layer, it may be expressed as a piezoelectric element.

The piezoelectric material layer includes a piezoelectric material that generates vibration by an electric field. Here, the piezoelectric material generates a potential difference due to dielectric polarization due to changes in the relative positions of positive (+) ions and negative (-) ions while pressure or torsion phenomenon acts on the crystal structure due to external force, and conversely, according to the applied voltage. It has the characteristic of causing vibration due to an electric field.

The vibration generating element 525 according to one example may include a piezoelectric material made of a polymer material, a piezoelectric material made of a thin film material, a piezoelectric material made of a composite material, or a piezoelectric material made of a single crystal ceramic or a polycrystalline ceramic. In this application, the piezoelectric material of the polymer material may include polyvinylidene difluoride (PVDF), P(VDF-TrFe), or P(VDFTeFE). The piezoelectric material of the thin film material may include ZnO, CdS, or AlN. The piezoelectric material of the composite material may include 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 may include α-AlPO ₄ , α-SiO ₂ , LiNbO ₃ , Tb2(MoO ₄ ) ₃ , Li ₂ B ₄ O ₇ , or ZnO. The piezoelectric material of the polycrystalline ceramic may include PZT-based, PT-based, PZT-Complex Perovskite-based, or BaTiO ₃ .

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

In addition, the housing 300 according to an example of the present application may further include a vibration element exposed portion 350 provided on the housing bottom 310.

The vibration element exposed portion 350 is formed on each of the first and second regions of the housing bottom 310 that overlap each of the first rear region A1 and the second rear region A2 of the display module 100. It is formed to penetrate. Accordingly, each of the first vibration generation module 510 and the second vibration generation module 530 attached to each of the first rear area (A1) and the second rear area (A2) of the display module 100 exposes the vibration element. It is exposed to the outside of the rear of the housing bottom 340 through the portion 350. Also, a lower part of each of the first vibration generating module 510 and the second vibration generating module 530, for example, a lower part of the vibration generating element 525, may be inserted into the vibration element exposed portion 350.

The vibration element exposed portion 350 secures a vibration space for each vibration of the first vibration generation module 510 and the second vibration generation module 530 coupled to the display module 100, enabling slimming of the electronic device. and facilitates the arrangement of each of the first vibration generation module 510 and the second vibration generation module 530. If the distance between the housing bottom 310 and the rear of the display module 100 is greater than the vibration space, the vibration element exposed portion 350 may be omitted.

The electronic device according to an example of the present application may further include a driving circuit unit 600, a cover window 700, and a rear cover 800.

The driving circuit unit 600 is disposed in a circuit storage space provided in the housing 300 and is connected to the display panel 110 and the sound generating device 500. The driving circuit unit 600 may include a panel driving circuit and a sound processing circuit.

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

The sound processing circuit generates an audio signal based on an audio source, amplifies the audio signal to generate a vibration drive signal, and generates a first vibration generation module 510 of the sound generator 500 according to the generated vibration drive signal. Each of the second vibration generation modules 530 is vibrated.

The cover window 700 is coupled to the housing 300 and supports the display module 100. For example, the cover window 700 may be supported on the upper step 360 provided on the housing side wall 330 of the housing 300 while supporting the display module 100.

The cover window 700 according to one example may be made of glass or tempered glass material. For example, the cover window 700 may have either Sapphire Glass or Gorilla Glass or a bonded structure thereof. This cover window 700 may be attached to the front of the display module 100 via an optical adhesive member. At this time, the optical adhesive member may be OCA (Optically Clear Adhesive), OCR (Optically Clear Resin), or PSA (Pressure Sensitive Adhesive).

A buffering member 200 may be interposed between the cover window 700 and the upper step 360 provided on the housing side wall 330 of the housing 300. The cushioning member 200 may include double-sided tape or foam pad. The buffer member 420 cushions the impact applied to the cover window 700, prevents vibration of the display module 100 from being transmitted to the housing 300, and enables the display module 100 to vibrate.

The cover window 700 covers the remaining non-display area excluding the display area of the display module 100. The cover window 700 according to an example is provided in a transparent area overlapping with the display area of the display module 100, a light blocking area overlapping with a non-display area of the display module 100, and a light blocking area to protect the display area of the display module 100. It may include a design layer that covers the non-display area.

The rear cover 800 is coupled to the housing 300 and covers the rear of the housing 300. For example, the rear cover 800 covers the circuit storage space provided at the rear of the housing 300.

The rear cover 800 according to one example may be coupled to the lower step portion 370 provided on the housing side wall 330 of the housing 300. For example, the rear cover 800 may be made of the same material as the cover window 700, or may be made of a different glass material than the cover window 700.

The electronic device according to an example of the present application may further include a central partition member 900.

The central partition member 900 is disposed at the rear middle portion (CP) of the display module 100. For example, the central partition member 900 may be disposed between the first vibration generation module 510 and the second vibration generation module 530. The central partition member 900 is made by spatially separating (or dividing) the first rear area (A1) and the second rear area (A2) at the rear of the display module 100, for example, the display panel 110. Prevents interference between sounds generated in each of the first rear area (A1) and the second rear area (A2).

The central partition member 900 according to one example is interposed between the rear of the display module 100 and the housing bottom 310 of the housing 300. For example, the central partition member 900 may include single-sided tape, foam pad, double-sided tape, double-sided foam tape, adhesive, or adhesive resin. In addition, the rear of the central partition member 900 is adhered to the housing bottom 310 of the housing 300, and the front of the central partition member 900 is adhered to the rear of the display module 100 or contacts it in a non-adhesive manner. It can be.

As such, the central partition member 900 separates the sounds generated by each of the first vibration generation module 510 and the second vibration generation module 530 to prevent interference between the sounds, thereby preventing the vibration of the display module 100. Accordingly, so-called 2.0-channel sound is output from the front of the display module 100.

The electronic device according to an example of the present application may further include a first module partition member 910 and a second module partition member 930.

The first module partition member 910 may be disposed in the first rear area A1 of the display module 100 to surround the first vibration generating module 510. The second module partition member 930 may be disposed in the second rear area A2 of the display module 100 to surround the second vibration generating module 530.

Each of the first and second module partition members 910 and 930 according to an example is interposed between the rear of the display module 100 and the housing bottom 310 of the housing 300. For example, each of the first and second module partition members 910 and 930 may have a circular, oval, or polygonal shape in plan, and may be formed of the same material as the central partition member 900, or may be made of one-sided tape or foam. It may include pads, double-sided tape, double-sided foam tape, adhesive, or adhesive resin. The rear surfaces of each of the first and second module partition members 910 and 910 are adhered to the housing bottom 310 of the housing 300, and the front surfaces of each of the first and second module partition members 910 and 930 are adhered to the housing bottom 310 of the housing 300. It may be adhered to the back of the display module 100 or may be contacted in a non-adhesive manner.

As such, each of the first and second module partition members 910 and 930 reflects the vibration generated from the corresponding vibration generation modules 510 and 530, thereby forming a uniform sound wave without an inflection point during acoustic analysis. For example, the vibration generated from the vibration generating modules 510 and 530 can be constantly transmitted to the module partition members 910 and 930 or constantly reflected from the module partition members 910 and 930, thereby forming a uniform sound wave. there is.

As described above, the electronic device according to an example of the present application is driven by a sound generating device 500 including a tuning fork member 520 made of a cantilever structure and a vibration generating element 525 made of a piezoelectric material. When the display module 100 vibrates, sound generated according to the vibration of the display module 100 can be output toward a viewer (or user) watching an image from the front of the display panel 110. Therefore, according to an example of the present application, the electronic device can increase the immersion of the viewer watching the video by outputting sound toward the viewer through the vibration of the display module 100 without a separate sound device or speaker, and can reduce the weight and /Or it can be slimmed down.

FIG. 4 is a perspective view illustrating a tuning fork member of a vibration generating module according to an example of the sound generating device shown in FIG. 2 .

When FIG. 4 is combined with FIGS. 2 and 3 , the tuning fork member 520 of the vibration generating modules 510 and 530 according to an example of the present application has the letters “ ⊂ ” or “ ⊃” based on the longitudinal direction (X). “It can have a ruler-shaped cross section. The tuning fork member 520 according to an example is made of magnesium (Mg), aluminum (Al), tungsten (W), magnesium (Mg) alloy material, magnesium lithium (Li) alloy material, aluminum (Al) alloy material, and tungsten ( W) It may be made of any one of the alloy materials, but is not limited thereto.

The tuning fork member 520 of the vibration generation modules 510 and 530 according to one example may include a first horizontal plate 521, a second horizontal plate 522, and a vertical plate 523.

The first horizontal plate 521 is attached to the rear of the display module 100 via adhesive members 501 and 503. The first horizontal plate 521 may have a bar shape with a constant width and length.

The second horizontal plate 522 is arranged in parallel with the first horizontal plate 521 with a gap space GS therebetween. For example, the first horizontal plate 521 and the second horizontal plate 522 are arranged to overlap vertically with the gap space GS between them. The second horizontal plate 522 has a bar shape with a constant width and length, and has a larger cross-sectional area than the first horizontal plate 522.

The second horizontal plate 522 according to one example may include a bar area 522a and a mass area 522b.

The bar area 522a may overlap the first horizontal plate 521 and have a first area corresponding to a constant first width and first length L1. The bar area 522a serves as a support for supporting the vibration generating element 525. The width of the bar area 522a may be the same as the width of the first horizontal plate 521, but is not limited thereto and may be set according to the sound range of the sound output according to the vibration of the display module.

The mass region 522b is connected to the bar region 522a and serves as a mass that vibrates several times due to inertia due to vibration of the bar region 522a. To this end, the mass area 522b may overlap the first horizontal plate 521 and have a second area according to the second width and second length L2. Here, the second width may be different from the first width, the second length L2 may be different from or the same as the first length L1, and the second area may be different from the first area. For example, the second length L2 is longer than the first length L1 and the second width is wider than the first width, so that the second area may be wider than the first area. This mass area 522b outputs low-pitched sound by reducing the resonance frequency according to the weight of the area, thereby improving the sound characteristics of the low-pitched range. In addition, the mass area 522b excites air according to vibration to generate an air damping effect, thereby reducing the peak generated at the sound pressure level at the resonance point and outputting a soft sound. The low frequency range may be, for example, 200 Hz or less, but is not limited thereto.

Accordingly, the second width and second length L2 or the second area of the mass area 522b are set according to the elasticity of the second horizontal plate 522 or the bar area 522a, or are output according to the vibration of the display module. It can be set according to the sound range of the sound being used.

In addition, the mass area 522b may have the same width as the bar area 522a and a second length L2. In this case, the tuning fork member 520 further includes a vibrating weight installed in the mass area 522b. It can be included. However, when the tuning fork member 520 includes a vibrating weight, there is a problem that the thickness (or height) of the tuning fork member 520 increases due to the thickness of the vibrating weight, thereby increasing the thickness of the electronic device. Additionally, the mass region 522b may have the same width as the bar region 522a, may have a thickness greater than that of the bar region 522a, and may have a second length L2. In this case, the mass region 522b ), there is a problem that the thickness (or height) of the tuning fork member 520 increases, thereby increasing the thickness of the electronic device. Therefore, the present application can implement the vibrating weight (or mass) of the tuning fork member 520 through the area of the mass region 522b without increasing the thickness (or height) of the tuning fork member 520, and the equation below: As shown in 1, the acoustic characteristics of the low-pitched range can be improved by reducing the resonance frequency (?0) according to the weight of the mass area 522b.

[Equation 1]

In Equation 1, 'f ₀ ' means the resonance frequency, 's' means stiffness, and 'm' means weight (or mass).

The mass area 522b according to another example may have an elliptical shape in plan, as shown in FIG. 5 . In this case, an oval-shaped (or circular) mass area may have a smaller width and a similar area than a square-shaped mass area. Accordingly, when the mass region 522b has an elliptical shape (or a circular shape) in plan, the width of the tuning fork member 520 may be reduced.

The mass area 522b according to another example may have a trapezoidal shape in plan, as shown in FIG. 5 . Additionally, the short side of the trapezoidal mass area may be connected to the bar area 522a. In this trapezoid-shaped mass area, the weight at the other end of the second horizontal plate 522 increases, thereby increasing the vibration speed of the second horizontal plate 522 due to the vibration of the vibration generating element 525.

And referring to FIGS. 4 to 6, the vertical plate 523 is connected to one side of the first horizontal plate 521 and one side of the second horizontal plate 522. Accordingly, the first horizontal plate 521, the second horizontal plate 522, and the vertical plate 523 have a cross-section in the shape of a " ⊂ " or a " ⊃ " shape, so that the first horizontal plate 521 faces up and down. ) and the second horizontal plate 522, a gap space (GS) is provided.

The gap space GS provides a vibration space for the second horizontal plate 522. The gap space GS according to one example may be directed toward the rear middle portion CP of the display module 100. For example, the vertical plate 523 is disposed adjacent to the rear edge of the display module 100, for example, the third and fourth housing side walls 333 and 334 of the housing 300. In this case, the vertical plate 523, which transmits the vibration of the second horizontal plate 522 to the first horizontal plate 521, is disposed adjacent to the rear edge of the display module 100, so that the rear of the display module 100 The acoustic characteristics of the high-pitched sound range can be improved through vibration at the edges. The high-pitched range may be, for example, 3 kHz or higher, but is not limited thereto.

The tuning fork member 520 of the vibration generating modules 510 and 530 according to an example of the present application vibrates according to the vibration of the vibration generating element 525 to vibrate the display module 100. The vibration generating element 525 may be attached to the second horizontal plate 522 of the tuning fork member 520 so as to face the housing bottom 310 of the housing 300 via the vibration element adhesive member 526. . At this time, the vibration generating element 525 may be attached to a portion of the bar area 522a and the mass area 522b of the second horizontal plate 522. For example, the vibration generating element 525 is attached to the bar area 522a, and a portion of the vibration generating element 525 is also attached to the mass area 522b.

As such, the tuning fork member 520 according to an example of the present application has only the first horizontal plate 521 attached to the rear of the display module 100, and the second horizontal plate 522 to which the vibration generating element 525 is attached. ) is spaced apart from the display module 100, so that it can vibrate independently without being dependent on the vibration of the display panel 100, and due to the air damping effect due to the vibration of the second horizontal plate 522, the resonance point As the peak generated at the sound pressure level becomes gentler, a softer sound can be output. In addition, the tuning fork member 520 according to an example of the present application has a thin thickness because the mass area 522b of the second horizontal plate 522 functions as a vibrating weight depending on the area, making it possible to slim the electronic device. there is.

FIG. 7 is a perspective view showing an electronic device according to another example of the present application, FIG. 8 is a cross-sectional view taken along line II-II' shown in FIG. 7, and FIG. 9 is a rear view of the display panel shown in FIG. 8, which is An acoustic side discharge part is additionally configured to the housing shown in FIGS. 1 to 6. Accordingly, hereinafter, only the acoustic side discharge unit and its related components will be described, and descriptions of the remaining identical components will be omitted or briefly explained.

Referring to FIGS. 7 to 9 , the housing 300 of the electronic device according to the present example includes a housing bottom portion 310, a housing side wall portion 330, and an acoustic side discharge portion 380.

Since each of the housing bottom 310 and the housing side wall 330 is the same as described above, duplicate description thereof will be omitted.

The acoustic side discharge unit 380 is provided on the housing side wall portion 330 facing the gap space GS provided in the tuning fork member 520 of each of the first vibration generation module 510 and the second vibration generation module 530. do. The acoustic side discharge unit 380 discharges vibration resulting from the operation of each of the first vibration generation module 510 and the second vibration generation module 530 to the outside of the housing 300, thereby discharging the first vibration generation module 510 and the second vibration generation module 530. The second vibration generation module 530 allows sound according to its own vibration to be transmitted to the user. In addition, the acoustic side discharge unit 380 serves as a ventilation hole to facilitate air circulation within the storage space of the housing 300 when each of the first vibration generation module 510 and the second vibration generation module 530 vibrates. By doing so, the vibration of the second horizontal plate of the tuning fork member 520 is made more smooth.

The acoustic side discharge unit 380 according to an example may include at least one first acoustic outlet 381 and at least one second acoustic outlet 383.

The at least one first sound outlet 381 is located on the third housing side wall 333 of the housing side wall portion 330 facing the gap space GS provided in the tuning fork member 520 of the first vibration generating module 510. It is provided in For example, at least one first sound outlet 381 may be formed to horizontally penetrate the third housing side wall 333 along the first longitudinal direction (or horizontal direction) (X) of the display module 100. .

The tuning fork member 520 of the first vibration generating module 510 has a gap space GS provided in the first longitudinal direction (or horizontal direction) (X) of the display module 100 and is provided on the third housing side wall 333. It is arranged to face at least one first sound outlet 381. For example, the vertical plate provided on the tuning fork member 520 of the first vibration generating module 510 is disposed adjacent to the center CP of the display module 100, and as a result, the gap space provided in the tuning fork member 520 (GS) is directed toward the at least one first sound outlet 381, so that the sound resulting from the vibration of the second horizontal plate provided on the tuning fork member 520 of the first vibration generation module 510 is not disturbed by the vertical plate and is at least It may be discharged to the outside of the housing 300 through one first sound outlet 381.

The at least one second sound outlet 383 is located on the fourth housing side wall 334 of the housing side wall portion 330 facing the gap space GS provided in the tuning fork member 520 of the second vibration generating module 530. It is provided in For example, at least one second sound outlet 383 may be formed to horizontally penetrate the fourth housing side wall 334 along the first longitudinal direction (or horizontal direction) (X) of the display module 100. .

The tuning fork member 520 of the second vibration generating module 530 has a gap space (GS) provided on the fourth housing side wall 334 in the first longitudinal direction (or horizontal direction) (X) of the display module 100. It is arranged to face at least one second sound outlet 383. For example, the vertical plate provided on the tuning fork member 520 of the second vibration generating module 530 is disposed adjacent to the center CP of the display module 100, and as a result, the gap space provided in the tuning fork member 520 (GS) is directed toward the at least one second sound outlet 383, so that the sound resulting from the vibration of the second horizontal plate provided on the tuning fork member 520 of the second vibration generation module 530 is not disturbed by the vertical plate and is at least It may be discharged to the outside of the housing 300 through one second sound outlet 383.

As such, the acoustic side discharge unit 380 according to the present example can be used to output a call sound according to the self-vibration of the first vibration generation module 510 and the second vibration generation module 530 toward the user's ears. For example, in this example, when the user uses the phone call function of the electronic device, the call sound is output toward the user's ears through the sound outlets 381 and 383, so that the display panel 110 is affected by the user's face contacting the display panel 110. It is possible to compensate for the degradation of call sound transmission caused by vibration attenuation of (110).

In addition, each of the first module partition member 910 and the second module partition member 930 of the electronic device according to this example is between the corresponding vibration generating modules 510 and 530 and the corresponding sound outlets 381 and 383. It may have an opening disposed in the area. For example, the first module partition member 910 is attached to the rear of the display module 100 to surround the first vibration generating module 510, and the first vibration generating module 510 and the first sound outlet 381 ) may include an opening disposed in the area between. The second module partition member 930 is attached to the rear of the display module 100 to surround the second vibration generating module 530, and is located in the area between the second vibration generating module 530 and the second sound outlet 383. It may include an opening disposed in. Accordingly, the electronic device according to the present example allows the sound resulting from self-vibration of the first vibration generation module 510 and the second vibration generation module 530 to be transmitted through the corresponding sound outlet 381 by the module partition members 910 and 930. , 383), the efficiency of sound output through the sound outlets 381 and 383 can be increased.

As such, the electronic device according to the present example provides the same effects as the electronic device shown in FIGS. 1 to 6 and produces sound due to the vibration of the display module 100 and sound due to the self-vibration of the sound generating device 500. By simultaneously outputting, the sound characteristics delivered to the user can be improved.

FIG. 10A is a diagram showing vibration frequency characteristics of a tuning fork member according to a comparative example, and FIG. 10B is a diagram showing vibration frequency characteristics of a tuning fork member according to an example of the present application.

In the tuning fork member according to the comparative example shown in FIG. 10A, the mass area of the second horizontal plate has a weight according to the thickness, and in the tuning fork member according to the example of the present application shown in FIG. 10B, the mass area of the second horizontal plate has an area. It has a weight according to .

As can be seen in FIGS. 10A and 10B, the vibration frequency characteristics by order of the tuning fork member according to the example of the present application are similar to the vibration frequency by order of the tuning fork member according to the comparative example. The hatching density shown in FIGS. 10A and 10B indicates the amount of deformation of the tuning fork member, and the greater the amount of deformation of the tuning fork member, the higher the density.

FIG. 11A is a graph showing the vibration speed of the tuning fork member according to the comparative example shown in FIG. 10A, and FIG. 11B is a graph showing the vibration speed of the tuning fork member according to the example of the present application shown in FIG. 10B. In FIGS. 11A and 11B, the horizontal axis represents frequency, and the vertical axis represents vibration speed.

As can be seen in FIGS. 11A and 11B, the vibration speed by frequency of the tuning fork member according to the example of the present application can be seen to be similar to the vibration speed by frequency of the tuning fork member according to the comparative example.

Therefore, the present application can implement the vibrating weight (or mass) of the tuning fork member through the area of the mass area without increasing the thickness (or height) of the tuning fork member.

Figure 12 is a graph showing acoustic characteristics according to the presence or absence of an acoustic side discharge part in an electronic device according to an example of the present application. In Figure 12, graph A represents the acoustic properties of the electronic device according to the present application without an acoustic side exhaust portion, and graph B represents the acoustic properties of the electronic device according to the present application with an acoustic side exhaust portion.

Referring to FIG. 12, a battery device, such as graph B, is an electronic device that outputs only sound according to the vibration of the display module, such as graph A, by simultaneously outputting sound according to the vibration of the display module and sound due to the self-vibration of the sound generating device. In comparison, it can be seen that the sound pressure increases in all frequency bands overall.

Therefore, the present application can improve the sound characteristics delivered to the user by simultaneously outputting sound due to vibration of the display module and sound due to self-vibration of the sound generating device.

Additionally, the sound generating device according to the embodiment of the present application can be applied to a sound generating device disposed on a display device. Display devices according to embodiments of the present specification include mobile devices, video phones, smart watches, watch phones, wearable devices, foldable devices, and rollable devices. device), bendable device, flexible device, curved device, 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, television, wallpaper display, laptop , can be applied to monitors, cameras, camcorders, and home appliances. And, when applied to a mobile device, it can be applied to at least one of a receiver and a speaker.

The features, structures, effects, etc. described in the examples of the present application described above are included in at least one example of the present application, and are not necessarily limited to only one example. Furthermore, the features, structures, effects, etc. exemplified in at least one example of the present application can be combined or modified for other examples by those skilled in the art to which the present application pertains. Therefore, contents related to such combinations and modifications should be construed as being included in the scope of the present application.

It includes a display module that displays an image according to an example of the present application, a housing surrounding one of the back and sides of the display module, and a sound generating device that vibrates the display module, and the sound generating device is attached to the back of the display module. It may include a tuning fork member, and a vibration generating element attached to the tuning fork member.

In an example of the present application, the tuning fork member includes a first horizontal plate attached to the rear of the display module, a second horizontal plate parallel to the first horizontal plate with a gap space therebetween and supporting the vibration generating element, and the first horizontal plate. It may include a vertical plate connected to one side of the plate and one side of the second horizontal plate and providing a gap space between the first horizontal plate and the second horizontal plate.

In an example of the present application, the second horizontal plate may have a larger cross-sectional area than the first horizontal plate.

In an example of the present application, the second horizontal plate may be connected to the vertical plate and include a bar area having a first area, and a mass area extending from the bar area to have a second area different from the first area.

In an example of the present application, the mass area may have a circular, elliptical, or polygonal shape in plan view.

In an example of the present application, the vibration generating element may be attached to a portion of the bar area and the mass area of the second horizontal plate through an adhesive member.

In an example of the present application, the vibration generating element may include a piezoelectric material layer.

In an example of the present application, the display module has a first rear area and a second rear area based on the rear middle part, and the sound generating device is attached to the first rear area of the display module and has a tuning fork member and a vibration generating element. It may include a first vibration generating module, and a second vibration generating module attached to the second rear area of the display module and having a tuning fork member and a vibration generating element.

In an example of the present application, the display module may further include a central partition member attached to the rear middle portion.

In an example of the present application, the gap space provided in the tuning fork member of each of the first vibration generation module and the second vibration generation module may face the middle rear portion of the display module.

The electronic device according to an example of the present application may further include a first module partition member surrounding the first vibration generating module, and a second module partition member surrounding the second vibration generating module.

In an example of the present application, the gap space provided in each tuning fork member of the first vibration generation module and the second vibration generation module may face the rear edge of the display module.

In an example of the present application, the housing includes a housing bottom surrounding the rear of the display module; A housing side wall portion surrounding the side of the display module; and an acoustic side discharge portion provided on a side wall of the housing, and the gap space provided in each tuning fork member of the first vibration generation module and the second vibration generation module may be directed to the acoustic side discharge portion.

In an example of the present application, the housing side wall portion includes a first housing side wall parallel to the longitudinal direction of the second horizontal plate of the tuning fork member, a second housing side wall parallel to the first housing side wall, and one end of each of the first and second housing side walls. It includes a third housing side wall connected to and a fourth housing side wall connected to the other end of each of the first and second housing side walls, wherein the acoustic side discharge unit includes at least one first acoustic outlet provided in the third housing side wall; And it may include at least one second sound outlet provided on the side wall of the fourth housing.

The electronic device according to an example of the present application is attached to the rear of the display module to surround the first vibration generating module, and includes a first module partition member having an opening disposed in an area between the first vibration generating module and the first sound outlet. ; and a second module partition member attached to the rear of the display module to surround the second vibration generating module and having an opening disposed in an area between the second vibration generating module and the second sound outlet.

The present application described above is not limited to the above-described embodiments 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 without departing from the technical details 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 claims described later, and the meaning and scope of the claims and all changes or modified forms derived from the equivalent concept should be interpreted as being included in the scope of the present application.

100: display module 110: display panel
300: Housing 310: Housing bottom
330: Housing side wall portion 380: Acoustic side discharge portion
500: Sound generating device 510, 530: Vibration generating module
520: tuning fork member 521: first horizontal plate
522: second horizontal plate 522a: bar area
522b: mass area 523: vertical plate
525: Vibration generating element 900: Central partition member
910, 930: Absence of module partition

Claims (31)

A display module including a display panel configured to display an image;
a housing accommodating the display module;
a cover window coupled to the housing and supporting the display module;
A cantilever structure connected to the rear of the display module; and
A vibration generating element connected to the cantilever structure and configured to vibrate the display module,
The cantilever structure is,
a bar area that vibrates according to the vibration of the vibration generating element; and
A mass region extending from the bar region and vibrating according to the vibration of the bar region,
The mass area has a planar shape different from the bar area. delete According to claim 1,
The mass area has a size larger than the bar area. According to claim 1,
The vibration generating element outputs sound according to its own vibration, and vibrates the display module to output sound according to the vibration of the display module. According to claim 1,
An electronic device wherein the vibration generating element operates as at least one of a receiver and a speaker. A display module including a display panel configured to display an image;
a housing accommodating the display module;
a cover window coupled to the housing and supporting the display module;
It includes a plurality of vibration generating modules connected to the rear of the display module and configured to vibrate the display module,
Each of the plurality of vibration generating modules,
A cantilever structure connected to the rear of the display module; and
It includes a vibration generating element connected to the cantilever structure,
The cantilever structure is,
a bar area that vibrates according to the vibration of the vibration generating element; and
An electronic device comprising a mass region extending from the bar region and vibrating according to vibration of the bar region. According to claim 6,
The mass area has a planar shape different from the bar area. According to claim 6,
The mass area has a larger area than the bar area. According to claim 6,
Each of the plurality of vibration generating modules outputs sound according to its own vibration, and vibrates the display module to output sound according to the vibration of the display module. According to claim 6,
Each of the plurality of vibration generating modules is an electronic device that operates as at least one of a receiver and a speaker. According to claim 6,
An electronic device further comprising a module partition member configured to surround each of the plurality of vibration generating modules. According to claim 6,
An electronic device further comprising a central partition member between the plurality of vibration generating modules. According to claim 6,
The electronic device, wherein the housing includes a plurality of acoustic outlets. According to claim 13,
It further includes a module partition member configured to surround each of the plurality of vibration generating modules,
The module partition member includes an opening between each of the plurality of vibration generating modules and each of the plurality of sound discharge ports. According to claim 14,
An electronic device further comprising a central partition member between the plurality of vibration generating modules. The method according to any one of claims 1 and 3 to 12,
The cantilever structure is,
A first horizontal plate and a second horizontal plate arranged vertically; and
An electronic device comprising a gap space between the first horizontal plate and the second horizontal plate. According to claim 16,
The second horizontal plate has a larger size or a larger area than the first horizontal plate. According to claim 16,
The second horizontal plate has the bar area and the mass area. According to claim 16,
The first horizontal plate and the second horizontal plate are connected to each other across the gap space. According to claim 16,
The gap space is toward the rear middle or rear edge of the display module. According to claim 16,
The housing is,
A side wall portion surrounding a side of the display module; and
Comprising at least one acoustic outlet in the side wall portion,
The gap space is directed toward the at least one acoustic outlet. The method according to any one of claims 1 and 3 to 15,
The cantilever structure includes a first horizontal plate and a second horizontal plate arranged vertically with a gap space therebetween,
The second horizontal plate includes the bar area and the mass area, and has a shape different from the first horizontal plate. According to claim 22,
The second horizontal plate has a larger size or a larger area than the first horizontal plate. According to claim 22,
The gap space is toward the rear middle or rear edge of the display module. The method according to any one of claims 1 and 3 to 15,
The housing includes an insertion portion configured to insert a lower portion of the vibration generating element. The method according to any one of claims 1 and 3 to 15,
The mass region is an electronic device in which the mass region vibrates several times according to the vibration of the bar region. The method according to any one of claims 1 and 3 to 15,
The mass region has the same thickness as the bar region and has a different weight than the bar region. The method according to any one of claims 1 and 3 to 15,
The bar area has a bar shape,
The mass area has a circular, elliptical, or polygonal shape in plan. The method according to any one of claims 1 and 3 to 15,
An electronic device, wherein the vibration generating element includes a piezoelectric material layer. The method according to any one of claims 1 and 3 to 15,
The vibration generating element is attached to a portion of the bar area and the mass area via an adhesive member. The method according to any one of claims 1 and 3 to 15,
The display module further includes a touch panel on the display panel.

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