Under-screen sound production structure and terminal

Abstract

The present disclosure relates to a kind of under-screen sounding structure and terminal, sounding structure includes sounding diaphragm, display screen module and support structure, along the thickness direction of display screen module, sounding diaphragm is located between support structure and display screen module, sounding diaphragm is set to the back side of display screen module.In this sounding structure, sounding diaphragm is used to realize under-screen sounding, so any position of screen can hear sound, improve user experience.Moreover, the sounding structure uses sounding diaphragm to replace conventional screen exciter, not only can reduce the occupation of stacking space in the thickness direction of terminal, also need not to open the avoiding hole in the support structure of terminal, guarantee the structure strength of support structure, in turn guarantee the structure strength of the terminal of installing this sounding structure, improve the ability of bending and anti-deformation of whole machine.In addition, since avoiding hole is not needed in support structure, it is also easier to improve the dustproof and waterproof performance of whole machine.

Description

Technical Field

[0001] This disclosure relates to the field of screen sound technology, and in particular to an under-screen sound structure and terminal. Background Technology

[0002] Current screen sound technology mainly includes the following solutions:

[0003] 1. Cantilever beam piezoelectric ceramic solution:

[0004] The cantilever piezoelectric ceramic is fixed to the middle frame of the phone. The cantilever piezoelectric ceramic drives the entire middle frame to vibrate, which makes the direction of sound transmission unclear and the sound is not directional.

[0005] 2. Screen exciter solution:

[0006] refer to Figure 1 As shown, the screen exciter 1a is fixed on the display screen 3a. The screen exciter 1a converts electrical energy into mechanical energy through the electromagnetic induction principle of a magnet and a coil, causing the display screen 3a to vibrate (the principle is similar to that of a traditional moving-coil speaker, but the vibration unit is replaced by the display screen). The sound produced by this solution has a clear directionality. However, in order to install the screen exciter 1a, a clearance hole needs to be opened on the middle frame 2a to avoid the screen exciter 1a, which affects the structural strength of the middle frame 2a, resulting in poor structural strength of the entire device. Summary of the Invention

[0007] To overcome the problems existing in related technologies, this disclosure provides an under-screen sound generation structure and terminal.

[0008] According to a first aspect of the present disclosure, an under-display sound-emitting structure is provided for use in a terminal. The sound-emitting structure includes a sound-emitting film, a display module, and a support structure. Along the thickness direction of the display module, the sound-emitting film is located between the support structure and the display module, and the sound-emitting film is disposed on the back side of the display module.

[0009] Optionally, the display module includes a display screen and a foam layer, wherein the foam layer is located on the back side of the display screen;

[0010] The foam layer forms a mounting groove for mounting the sound-emitting film, the sound-emitting film is located in the mounting groove, and the sound-emitting film is connected to the back side of the display screen.

[0011] Optionally, a first gap is provided between the edge of the sound-emitting diaphragm and the sidewall of the mounting groove, the first gap being less than or equal to 0.2 mm.

[0012] Optionally, the sound-generating structure further includes a circuit board connected to the sound-generating membrane. At the connection point between the circuit board and the sound-generating membrane, a third gap is provided between the edge of the sound-generating membrane and the inner edge of the foam layer, with the inner edge facing the sound-generating membrane. The third gap is greater than or equal to 1.2 mm.

[0013] Optionally, a second gap is provided between the sound-emitting membrane and the supporting structure along the thickness direction, the second gap being greater than or equal to 0.2 mm.

[0014] Optionally, the support structure includes a clearance groove located on the side of the support structure facing the display module, and the bottom wall of the clearance groove forms the second gap with the sound-emitting film.

[0015] Optionally, the sound-emitting film includes a piezoelectric film, which is attached to the back side of the display screen.

[0016] Optionally, in the vertical direction of the display module, the sound-emitting film is located near the top side of the terminal relative to the bottom side of the terminal; in the horizontal direction of the display module, the sound-emitting film is located in the middle position; wherein the vertical direction, the horizontal direction, and the thickness direction are all perpendicular to each other.

[0017] Optionally, the aspect ratio of the sound-emitting film is greater than or equal to 1.5:1 and less than or equal to 2:1, and the long side of the sound-emitting film is parallel to the long side of the display module, and the wide side of the sound-emitting film is parallel to the wide side of the display module.

[0018] According to a second aspect of the present disclosure, a terminal is provided, the terminal including an under-screen sound structure as described in the first aspect.

[0019] The technical solutions provided by the embodiments of this disclosure can include the following beneficial effects: In this sound-emitting structure, a sound-emitting film is used to achieve under-screen sound generation, so sound can be heard from any position on the screen, improving the user experience. Moreover, by using a sound-emitting film instead of a conventional screen exciter, this sound-emitting structure not only reduces the stacking space occupied in the thickness direction of the terminal but also eliminates the need for clearance holes in the terminal's support structure, ensuring the structural strength of the support structure and thus guaranteeing the overall structural strength of the terminal with this sound-emitting structure installed, improving the overall resistance to bending and deformation. Furthermore, since there is no need to create clearance holes in the support structure, it is also easier to improve the overall dustproof and waterproof performance of the device.

[0020] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0022] Figure 1 This is a schematic diagram of a sound-generating structure shown according to a related technology.

[0023] Figure 2 This is a side view schematic diagram of a sound-generating structure according to an exemplary embodiment.

[0024] Figure 3 This is a front view schematic diagram (including a circuit board) of a sound-generating structure according to an exemplary embodiment.

[0025] Figure 4 This is a front view schematic diagram of a conductive structure (excluding the circuit board) according to an exemplary embodiment. Detailed Implementation

[0026] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0027] This disclosure provides an under-display sound-emitting structure for use in a terminal. This structure utilizes a sound-emitting diaphragm to achieve under-display sound, allowing sound to be heard from any position on the screen, thus improving the user experience. Furthermore, by replacing a conventional screen exciter with a sound-emitting diaphragm, this structure reduces the space occupied in the thickness direction of the terminal and eliminates the need for clearance holes in the terminal's support structure, ensuring the structural strength of the support structure and consequently guaranteeing the overall structural strength of the terminal with this sound-emitting structure, improving its resistance to bending and deformation. Additionally, since no clearance holes are required in the support structure, it also facilitates improved dust and water resistance for the entire device.

[0028] In one exemplary embodiment, an under-display sound generation structure is provided, applied to a terminal. (Reference) Figure 2 and 3 As shown, the sound-generating structure includes a sound-generating film 1, a display module 3, and a support structure 2, along the thickness direction of the display module 3 (reference). Figure 2 (Up and down direction), the sound-emitting film 1 is located between the support structure 2 and the display module 3, and the sound-emitting film 1 is disposed on the back side of the display module 3.

[0029] Among them, the support structure 2 serves as the frame of the terminal, and is used to support and protect the display module 3.

[0030] In this sound-generating structure, the sound-generating film 1 may include a piezoelectric film, which can be directly attached to the back side of the display module 3, hardly occupying any space in the thickness direction of the terminal, facilitating the stacking design of various components inside the terminal, and helping to reduce the thickness of the terminal.

[0031] Because the sound-emitting membrane 1 is relatively thin, there is no need to create clearance holes in the terminal's support structure 2 (e.g., the middle frame), ensuring the structural strength of the support structure 2. This, in turn, guarantees the overall structural strength of the terminal with the sound-emitting structure installed, improving the overall device's resistance to bending and deformation. Furthermore, since there is no need to create clearance holes in the support structure 2, it is also easier to improve the overall device's dustproof and waterproof performance.

[0032] In this under-display sound structure, sound is emitted under the screen through a sound-emitting membrane 1, eliminating the need for a sound outlet. This better meets the current development needs of full-screen displays, resulting in a more visually integrated and aesthetically pleasing screen. Furthermore, sound can be heard from any position on the screen, enhancing the user experience.

[0033] For example, the terminal can be a mobile phone, and the supporting structure 2 can be a mid-frame. The sound-emitting film 1 is disposed on the back side of the display module 3 and located between the display module 3 and the mid-frame, thereby realizing under-screen sound generation. This replaces the cantilever beam piezoelectric ceramic sound generation scheme and the screen exciter sound generation scheme in related technologies. It occupies less space in the thickness direction of the mobile phone, which is conducive to the internal stacking design of the mobile phone and provides convenience for the development of mobile phones towards thinner and lighter designs.

[0034] In one exemplary embodiment, a sound-generating structure is provided, with reference to Figure 2-4 As shown, in this sound-generating structure, the display module 3 includes a display screen 31 and a foam layer 32. The foam layer 32 is located on the back side of the display screen 31, providing some protection for the display screen 31. The foam layer 32 forms a mounting groove 321 for mounting the sound-generating film 1. The sound-generating film 1 is located in the mounting groove 321 and is connected to the back side of the display screen 31 to better achieve under-screen sound generation.

[0035] A first gap 10 is provided between the edge of the sound-emitting diaphragm 1 and the side wall of the mounting groove 321, that is, the sound-emitting diaphragm 1 does not contact the foam layer 32 forming the mounting groove 321, providing space for the vibration of the sound-emitting diaphragm 1, so as to better realize under-screen sound generation.

[0036] It should be noted that if the gap between the sound-emitting membrane 1 and the sidewall of the mounting groove 321 is too large, there is a risk of light leakage. Therefore, the first gap 10 is less than or equal to 0.2 mm to avoid light leakage.

[0037] Understandably, if the gap between the sound-emitting diaphragm 1 and the sidewall of the mounting groove 321 is too small, a sound-emitting effect will be applied. Therefore, the first gap can also be greater than or equal to 0.1mm to ensure the under-screen sound-emitting effect.

[0038] The sound-generating structure also includes a circuit board 4, which is connected to the sound-generating membrane 1. At the connection point between the circuit board 4 and the sound-generating membrane 1, a third gap 30 is provided between the edge of the sound-generating membrane 1 and the inner edge of the foam layer 32 (wherein the inner edge refers to the side near the center of the display module 3). The inner edge faces the sound-generating membrane 1, and the third gap 30 is greater than or equal to 1.2 mm, so as to provide clearance space for the connection between the circuit board 4 and the sound-generating membrane 1, prevent the circuit board 4 and the foam layer 32 from interfering with each other and causing compression, and facilitate the connection between the circuit board 4 and the sound-generating membrane 1.

[0039] Among them, the circuit board 4 can be a flexible circuit board (FPC circuit board 4) to improve the flexibility of the circuit board 4, so as to better facilitate the connection between the circuit board 4 and the sound-generating film 1.

[0040] Understandably, the purpose of the third gap 30 is to prevent interference between the circuit board 4 and the foam layer 32, and to prevent them from squeezing each other. Therefore, the third gap 30 does not need to be set too large. Moreover, if the third gap 30 is set too large, light leakage may occur at the location of the third gap 30. Therefore, the third gap 30 can be less than or equal to 2mm, for example, the third gap 30 is 1.2mm or 1.5mm, which can both prevent interference between the circuit board 4 and the foam layer 32 and prevent light leakage.

[0041] In one exemplary embodiment, a sound-generating structure is provided, with reference to Figure 2-4 As shown, in this sound-emitting structure, a second gap 20 is provided between the sound-emitting film 1 and the support structure 2 along the thickness direction of the display module 3. That is, the sound-emitting film 1 and the support structure 2 do not contact each other, so as to avoid the support structure 2 and the sound-emitting film 1 being squeezed, which would affect the performance of the sound-emitting film 1 and the sound-emitting effect.

[0042] The second gap 20 is greater than or equal to 0.2mm, providing sufficient space between the sound-generating membrane 1 and the supporting structure 2 to better ensure the sound generation effect.

[0043] Understandably, if the second gap 20 only needs to prevent the sound-emitting membrane 1 and the supporting structure 2 from squeezing each other, it does not need to be too large. Moreover, if the second gap 20 is set too large, it will increase the dimension in the thickness direction of the terminal. Therefore, the second gap 20 can be less than or equal to 1 mm, for example, the second gap 20 is 0.2 mm or 0.5 mm, which can both prevent the sound-emitting membrane 1 and the supporting structure 2 from squeezing each other and ensure that the dimension in the thickness direction of the terminal is not too large.

[0044] In this sound-generating structure, the support structure 2 may include a relief groove 21, which is located on the side of the support structure 2 facing the display module 3. The bottom wall of the relief groove 21 forms a second gap 20 with the sound-generating film 1. That is, the relief groove 21 is adapted to the sound-generating film 1, and by setting the relief groove 21, the support structure 2 and the sound-generating film 1 are prevented from squeezing each other.

[0045] By providing the clearance groove 21, the dimensions of other parts of the support structure 2 (excluding the clearance groove 21) in the thickness direction can be adjusted, thereby improving the overall structural strength of the support structure 2. Furthermore, the thickness dimension of the terminal can be reduced, which is beneficial for the development of thinner and lighter terminals.

[0046] The clearance groove 21 and the mounting groove 321 are positioned opposite each other in the vertical direction of the terminal (see reference). Figure 3 (shown in the up / down direction) and left / right direction (reference) Figure 3 The dimensions (shown in the left and right directions) are the same, providing sufficient space for the vibration of the sound-generating diaphragm 1, ensuring sound generation effect, preventing light leakage, ensuring overall structural strength, and improving the user experience.

[0047] In one exemplary embodiment, a sound-generating structure is provided. (See reference...) Figure 2-4 As shown, in this sound-generating structure, in the vertical direction of the display module 3 (reference) Figure 3 In the vertical direction shown, relative to the bottom side of the terminal, the sound-emitting film 1 is closer to the top side of the terminal; in the horizontal direction of the display module 3 (refer to...), Figure 3 In the left-right direction (as shown), the sound-emitting diaphragm 1 is located in the middle position; wherein, in the up-down direction, left-right direction and thickness direction (refer to...) Figure 2 The vertical directions shown are perpendicular to each other.

[0048] In this sound-generating structure, the sound-generating diaphragm 1 is positioned near the top of the terminal and in the middle of the terminal in the left-right direction, making the position of the sound source more in line with the user's usage habits and improving the user experience.

[0049] The specific location of the sound-emitting diaphragm 1 can be determined through acoustic simulation to better improve the user experience. Acoustic simulation can be achieved using existing technologies, which will not be elaborated upon here.

[0050] In this sound-generating structure, the aspect ratio and specific dimensions of the sound-generating diaphragm 1 can be determined through acoustic simulation. Specifically, the aspect ratio of the sound-generating diaphragm 1 can be greater than or equal to 1.5:1 and less than or equal to 2:1 to better ensure sound generation and improve sound quality.

[0051] For example, the aspect ratio of the sound-generating membrane 1 is 1.5:1 or 2:1, and the specific dimensions are determined through acoustic simulation to better ensure the sound generation effect.

[0052] Furthermore, when setting the sound-emitting film 1, its long side is parallel to the long side of the display module 3, and its wide side is parallel to the wide side of the display module 3. (Reference) Figure 3 As shown, the vertical direction of the display module 3 is its long side, and the horizontal direction is its wide side. Correspondingly, the long side of the sound-emitting film 1 is also vertically positioned, and the wide side is also horizontally positioned. Through the above settings, the under-screen sound effect can be better improved, enhancing the user experience.

[0053] To better illustrate the under-display sound structure in this application, a specific example is provided below.

[0054] refer to Figure 2-4 As shown in the example, the terminal is a mobile phone, and the supporting structure 2 is the middle frame.

[0055] The thickness of the foam layer 32 is less than the thickness of the sound-emitting film 1. The sound-emitting film 1 is a piezoelectric film with a thickness of 0.27 mm. The display module 3 includes an OLED flexible screen (i.e., display screen 31) and a foam layer 32, wherein the foam layer 32 includes foam and copper foil, and the thickness of the foam layer 32 is 0.19 mm, meaning that the thickness of the foam layer 32 is less than the thickness of the piezoelectric film. The piezoelectric film is attached to the back side of the display screen 31, and the actual protrusion of the piezoelectric film from the back side of the display module 3 is 0.08 mm, which has a small impact on the stacking space in the thickness direction of the terminal.

[0056] The foam layer 32 forms a mounting groove 321, and the piezoelectric film is located inside the mounting groove 321.

[0057] The sound-generating structure also includes a flexible circuit board connected to a piezoelectric film. At the connection point, an avoidance notch is provided, such that a third gap 30 is provided between the edge of the piezoelectric film and the inner edge of the foam layer 32 at this location, wherein the inner edge faces the piezoelectric film, and the third gap 30 is 1.2 mm, so as to avoid interference between the flexible circuit board and the foam layer 32.

[0058] Furthermore, a first gap 10 of 0.2 mm is provided between the side wall of the mounting groove 321 and the edge of the piezoelectric film. That is, except for the inner edge of the foam layer 32 at the aforementioned avoidance notch position, the gap between the inner edge of the foam layer 32 facing the piezoelectric film and the edge of the piezoelectric film is 0.2 mm, which can both prevent light leakage and ensure sound generation effect.

[0059] An clearance groove 21 is provided on the middle frame, which is positioned opposite to the mounting groove 321. Except for the groove depth, the two are the same in all other dimensions. There is a third gap 30 between the bottom of the clearance groove 21 and the piezoelectric film. The third gap 30 is 0.2mm to prevent the middle frame and the piezoelectric film from squeezing each other.

[0060] In this sound-generating structure, because the piezoelectric film is relatively thin, there is no need to create clearance holes in the mid-frame, ensuring the structural strength of the mid-frame and thus guaranteeing the overall structural strength of the phone with this sound-generating structure, improving the phone's resistance to bending and deformation. Furthermore, since there is no need to create clearance holes in the mid-frame, it is also easier to improve the overall dustproof and waterproof performance of the phone.

[0061] This under-display sound structure achieves sound generation under the screen through a piezoelectric thin film, eliminating the need for a sound outlet. This better meets the current development needs of full-screen displays, resulting in a more visually integrated and aesthetically pleasing screen. Furthermore, it ensures sound can be heard from any position on the screen, enhancing the user experience.

[0062] This disclosure also proposes a terminal, such as a mobile phone, laptop computer, or tablet computer. This terminal includes the aforementioned under-display sound structure, enabling it to achieve the same technical effects as the described under-display sound structure.

[0063] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0064] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. An under-screen sound generation structure, applied in a terminal, characterized in that, The sound-generating structure includes a sound-generating film, a display module, and a support structure. Along the thickness direction of the display module, the sound-generating film is located between the support structure and the display module, and the sound-generating film is disposed on the back side of the display module. The display module includes a display screen and a foam layer. The foam layer is located on the back side of the display screen. The foam layer forms a mounting groove for mounting the sound-emitting film. The sound-emitting film is located in the mounting groove. The thickness of the foam layer is less than the thickness of the sound-emitting film. The support structure includes a clearance groove located on the side of the support structure facing the display module, and the bottom wall of the clearance groove forms a second gap with the sound-emitting film.

2. The sound-generating structure according to claim 1, characterized in that, The sound-emitting diaphragm is connected to the back side of the display screen.

3. The sound-generating structure according to claim 2, characterized in that, A first gap is provided between the edge of the sound-emitting diaphragm and the sidewall of the mounting groove, the first gap being less than or equal to 0.2 mm.

4. The sound-generating structure according to claim 2, characterized in that, The sound-generating structure also includes a circuit board connected to the sound-generating membrane. At the connection point between the circuit board and the sound-generating membrane, a third gap is provided between the edge of the sound-generating membrane and the inner edge of the foam layer, with the inner edge facing the sound-generating membrane. The third gap is greater than or equal to 1.2 mm.

5. The sound-generating structure according to claim 1, characterized in that, The second gap is greater than or equal to 0.2 mm.

6. The sound-generating structure according to claim 1, characterized in that, The sound-emitting film includes a piezoelectric film, which is attached to the back side of the display screen.

7. The sound-generating structure according to claim 1, characterized in that, In the vertical direction of the display module, the sound-emitting film is located near the top of the terminal relative to the bottom side of the terminal; in the horizontal direction of the display module, the sound-emitting film is located in the middle position; wherein, the vertical direction, the horizontal direction, and the thickness direction are all perpendicular to each other.

8. The sound-generating structure according to any one of claims 1-7, characterized in that, The aspect ratio of the sound-emitting film is greater than or equal to 1.5:1 and less than or equal to 2:1, and the long side of the sound-emitting film is parallel to the long side of the display module, and the wide side of the sound-emitting film is parallel to the wide side of the display module.

9. A terminal, characterized in that, The terminal includes the under-screen sound-emitting structure as described in any one of claims 1-8.

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