A spacer structure of a sound production layer, a sound production layer and a display device

Abstract

The application discloses a spacing structure of a sound production layer, the sound production layer and a display device. The spacing structure comprises a base layer and a spacing layer. The spacing layer is arranged on the base layer. The spacing layer comprises a plurality of spacing protrusions which are spaced apart in a first direction. Each spacing protrusion is arranged on the base layer along a second direction which is perpendicular to the first direction. A spacing groove which provides a space required for sound production is formed between two adjacent spacing protrusions. A plurality of spacers are arranged on each spacing protrusion and protrude away from the surface of the spacing protrusion. The application can reduce the resonance frequency parameter of the driven sound production, that is, in the case of the same sound pressure level, the resonance frequency can be reduced by increasing the rear cavity, and the resonance frequency is more stable, and thus the requirement of the processing technology is reduced.

Description

Technical Field

[0001] This invention relates to the field of screen directional sound technology, specifically to a sound-emitting layer spacing structure, a sound-emitting layer, and a display device. Background Technology

[0002] The ultra-thin, narrow-bezel, and even full-screen designs of display devices are leaving less and less space for sound-generating devices. Traditional sound-generating devices are bulky and have limited installation locations, making it difficult to find suitable places and spaces in next-generation display devices. Therefore, it is necessary to redesign sound-generating devices to meet the needs of current display devices.

[0003] Some display device manufacturers have designed methods to generate sound using the screen itself. Screen sound technology, as a surface audio technology, provides a new solution for the audio of multimedia audio-visual equipment. Currently, transparent screen directional speakers that combine display devices with screen sound devices are under development. These speakers utilize the screen's own vibration as the speaker, saving the resonant cavity space of traditional speakers. At the same time, the directional propagation characteristics meet the privacy requirements of personal electronic devices and the non-interference requirements of public devices.

[0004] How to combine existing displays with directional speakers to enable displays to integrate multiple functions such as directional screen sound generation and display is a problem that needs to be solved. In addition, after combining the display and directional speaker structures, how to further reduce the resonant frequency of screen sound generation while achieving the same sound pressure level, and how to reduce the manufacturing process requirements of directional displays are also problems that need to be solved. Summary of the Invention:

[0005] The purpose of this invention is to provide a sound-emitting layer spacing structure, a sound-emitting layer, and an electronic device that can reduce the resonant frequency of screen sound emission and reduce the processing requirements of directional displays.

[0006] To achieve the above objectives, on the one hand, the present invention proposes a spacer structure for a sound-emitting layer, including a base layer;

[0007] A spacer layer is disposed on the base layer. The spacer layer includes a plurality of spacer protrusions spaced apart in a first direction. Each spacer protrusion extends on the base layer in a second direction perpendicular to the first direction. A spacer groove is formed between two adjacent spacer protrusions to provide space for sound generation. Each spacer protrusion is provided with a plurality of spacer members spaced apart and protruding in a direction away from the surface of the spacer protrusion.

[0008] In a preferred embodiment, the height difference between the upper surface of the spacer and the bottom surface of the spacer groove is 35 μm or more.

[0009] In a preferred embodiment, the spacer layer is integrally formed with the base layer, or the spacer layer is formed by processing on the base layer.

[0010] In a preferred embodiment, the height difference between the surface of the spacer and the spacer protrusion is 2µm to 1mm, and the center-to-center distance between two adjacent spacers on each spacer protrusion is 10µm to 2cm.

[0011] In a preferred embodiment, the base layer is a conductive substrate, the spacer layer is disposed on the conductive substrate, and the conductive substrate and the spacer layer are conductive as a whole.

[0012] In a preferred embodiment, the base layer is a display layer, the spacer layer is disposed on the display layer, and the display layer and the spacer layer are electrically conductive as a whole.

[0013] On the other hand, the present invention proposes a sound-generating layer including the above-described spacer structure.

[0014] In a preferred embodiment, the sound-generating layer includes a vibrating layer and a non-vibrating layer. The non-vibrating layer includes the aforementioned spacer structure. The vibrating layer includes a conductive layer. The spacer layer is disposed between the conductive layer and the base layer to provide the air gap required for the vibration of the vibrating layer.

[0015] In a preferred embodiment, the sound-generating layer further includes an insulating layer, which is disposed at least between the conductive layer and the spacer layer.

[0016] In a preferred embodiment, the sound-emitting layer further includes edge traces, and the edge traces are provided on the edges of the base layer and / or the edges of the conductive layer.

[0017] In another aspect, the present invention provides a display device including the aforementioned sound-emitting layer.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention adds a spacer groove between the spacer protrusions. The presence of the spacer groove can increase the vibration cavity of the sound-generating layer, thereby reducing the resonant frequency parameter that drives the sound generation. In other words, under the same sound pressure level, by increasing the cavity, the resonant frequency can be reduced and the resonant frequency is more stable, which also reduces the requirements of the processing technology. Attached image description:

[0020] Figure 1 This is a three-dimensional structural diagram of the spacer structure of the present invention;

[0021] Figure 2 for Figure 1 Front view structural diagram;

[0022] Figure 3 for Figure 1 A schematic diagram of the side view structure;

[0023] Figure 4 for Figure 1 A top-view structural diagram;

[0024] Figure 5 This is a schematic diagram of the structure of the sound-generating layer of the present invention.

[0025] The attached figures are labeled as follows:

[0026] 1. Base layer; 2. Spacer layer; 21. Spacer protrusion; 22. Spacer groove; 23. Spacer element; 10. Vibration layer; 20. Non-vibration layer; 3. First edge trace; 4. First edge insulation layer; 5. Display layer; 6. Electrode layer; 61. Conductive layer; 62. Second edge trace; 7. Insulation layer; 8. Second edge insulation layer; 9. Protective layer. Detailed implementation method:

[0027] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0028] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0029] The present invention discloses a sound-emitting layer spacing structure, a sound-emitting layer and a display device, which reduces the resonant frequency of the driving vibration by increasing the vibration cavity of the sound-emitting layer, and can be combined with existing display screens for application in various display fields.

[0030] Combination Figures 1-4 As shown in the embodiment of the present invention, a sound-generating layer spacing structure includes a base layer 1 and a spacing layer 2. In this embodiment, the base layer 1 is a conductive substrate, specifically a SUS stainless steel plate. Since the base layer 1 is a steel structure with low surface resistance, it is beneficial to improve sound generation efficiency. In one embodiment, the sheet resistance of the steel plate surface is below 10mΩ. The spacing layer 2 is disposed on the base layer 1 to provide the air gap required for the vibration of the sound-generating layer. The spacing layer 2 and the base layer 1 are integrally conductive. In practice, the spacing layer 2 can be integrally formed with the base layer 1, or the spacing layer 2 can be processed on the base layer 1.

[0031] In this embodiment, the spacer layer 2 specifically includes multiple spacer protrusions 21 disposed on the upper surface of the base layer 1. These multiple spacer protrusions 21 are spaced apart on the base layer 1 along a first direction (e.g., transverse). Each spacer protrusion 21 extends on the base layer 1 along a second direction perpendicular to the first direction (e.g., longitudinal). Each spacer protrusion 21 protrudes away from the upper surface of the base layer 1, meaning there is a height difference between each spacer protrusion 21 and the surface of the base layer 1. Thus, a spacer groove 22 is formed between adjacent spacer protrusions 21 to provide the space required for sound generation. The shape of the spacer protrusions 21 and the spacer groove 22 is not limited in this invention. For example, in this embodiment, the spacer protrusion 21 is a rectangular parallelepiped, so the spacer groove 22 formed between adjacent spacer protrusions 21 is also a rectangular parallelepiped groove. In other embodiments, if the spacer protrusion 21 can also be a trapezoid, then the formed spacer groove 22 is also a trapezoid. The spacer groove 22 can also be other irregular shapes. The present invention does not limit this, as long as the spacer groove 22 is formed.

[0032] Each spacer protrusion 21 is provided with a plurality of spacers 23 spaced apart. The spacers 23 are spaced apart on the spacer protrusion 21 along the second direction in which the spacer protrusion 21 is located. Each spacer 23 protrudes from the upper surface of the corresponding spacer protrusion 21 in a direction away from the upper surface of the spacer protrusion 21 (i.e., upward). That is to say, a height difference is also formed between each spacer 23 and the upper surface of the spacer protrusion 21. Compared with the existing method of directly setting spacers 23 on the base layer 1, the present invention adds spacer grooves 22 between the spacer protrusions 21 by setting spacer protrusions 21, thereby increasing the sound cavity of the sound-emitting layer. The present invention does not limit the shape of the spacers 23. For example, in this embodiment, it is a flat cuboid shape. In other embodiments, it can also be cylindrical, etc. That is to say, as long as it protrudes from the surface of the spacer protrusion 21, its shape is not limited by the present invention.

[0033] Preferably, in practice, the height difference between the highest point of the spacer 23 and the bottom surface of the spacer groove 22 is preferably 35 μm or more. That is, regardless of the individual heights of the spacer 23 and the spacer groove 22, as long as the height difference between them is 35 μm or more, it is acceptable. Theoretically, the larger the rear cavity, the smaller the elastic coefficient of the air inside, which is beneficial for reducing the resonant frequency of the vibrating layer. Of course, in practice, the height difference between the highest point of the spacer 23 and the surface of the spacer protrusion 21 is preferably 2 μm to 1 mm, meaning the depth of the spacer groove 22 is preferably 33 μm or more. Furthermore, preferably, the center-to-center distance between two adjacent spacers 23 on each spacer protrusion 21 is 10 μm to 2 cm. The smaller the distance, the higher the sound generation efficiency of the vibrating layer. Additionally, the positions of two adjacent spacers 23 on multiple spacer protrusions 21 are preferably corresponding, which facilitates the formation of multiple array-distributed sound units between the spacers 23, spacer protrusions 21, and spacer grooves 22, thereby enabling the formation of a parametric array loudspeaker using the parametric array principle.

[0034] Combination Figure 5 As shown in the figure, this embodiment of the invention also discloses a sound-generating layer, which includes a vibrating layer 10 and a non-vibrating layer 20. The non-vibrating layer 20 includes the spacer structure in the above embodiment. The non-vibrating layer 20 may also include a first edge trace 3, which is disposed at the edge of the base layer 1 and is arranged around the edge of the base layer 1 to facilitate wiring and enhance the overall conductivity of the base layer 1. When processing the non-vibrating layer 20, the spacer layer 2 is first made as a whole on the conductive substrate, and then the first edge trace 3 is set on the conductive substrate. A first edge insulating layer 4 may also be set on the first edge trace 3, which can prevent the first edge trace 3 from being oxidized when it is not attached to the vibrating layer 10, and can also play an insulating role.

[0035] In this embodiment, the vibration layer 10 specifically includes a display layer 5, an electrode layer 6, and an insulating layer 7. The display layer 5 can be an AMOLED display layer. In practice, an existing AMOLED display layer can be used directly without changing the structure and thickness of the AMOLED display layer.

[0036] Electrode layer 6 is disposed on the lower surface of display layer 5. Specifically, it includes conductive layer 61 and second edge trace 62. Conductive layer 61 is disposed on the lower surface of display layer 5, and second edge trace 62 is disposed on the upper surface of conductive layer 61, that is, between display layer 5 and conductive layer 61. The second edge trace 62 is disposed on the edge of the upper surface of conductive layer 61, and is disposed around the edge of conductive layer 61. It has the same function as the first edge trace 3, which is to facilitate wiring and enhance the overall conductivity of conductive layer 61.

[0037] Preferably, a second edge insulating layer 8 may also be covered on the second edge trace 62. This prevents the second edge trace 62 from being oxidized before it is bonded to the display layer 5 and also serves as insulation. The display layer 5 and the conductive layer 61 are fully bonded together by adhesive. In other embodiments, the electrode layer 6 is not limited to being disposed on the conductive layer 61. For example, the electrode layer 6 may also be disposed on the lower surface of the conductive layer 61. That is to say, the position of the electrode layer 6 is not limited to the position defined here, as long as this electrode layer 6 is disposed on the vibrating layer.

[0038] An insulating layer 7 is disposed on the lower surface of the conductive layer 61, serving as the bottom layer of the vibrating layer 10. It is framed and bonded to the non-vibrating layer 20. After bonding, the insulating layer 7 is located between the conductive layer 61 and the spacer structure, providing insulation. In practice, the insulating layer 7 can be made of polyimide (PI), PET (polyethylene terephthalate), or CPI (transparent polyimide film), but PI is generally used. The thickness of the insulating layer 7 only needs to meet the breakdown voltage withstand requirements of the directional sound generation system, typically chosen to be 10µm to 15µm thick.

[0039] In addition, the aforementioned vibration layer 10 may also include an outermost protective layer 9, which is fully bonded to the upper surface of the display layer 5 with adhesive. In practice, the protective layer 9 may be a CPI (transparent polyimide film) material layer required for the display screen, a polarizer layer, or a composite structure layer of CPI (transparent polyimide film) and a polarizer layer. Thus, the aforementioned protective layer 9, display layer 5, conductive layer 61, and insulating layer 7 constitute the non-vibration layer 20 of the sound-generating layer. During the fabrication of the vibrating layer 10, a conductive layer 61 is first fabricated on the insulating layer 7. Then, a second edge trace 62 is fabricated along the edge of the conductive layer 61. Next, a second edge insulating layer 8 is fabricated on the second edge trace 62. The conductive layer 61 is then bonded to an FPC (not shown in the figure). Finally, the conductive layer 61 is bonded to the display layer 5 and the protective layer 9. The bonding order of these three layers is not limited; the display layer 5 and the protective layer 9 can be bonded together first, followed by the conductive layer 61, or the conductive layer 61 can be bonded to the display layer 5 and the protective layer 9 sequentially. Theoretically, the lower the total thickness of the vibrating layer 10, the higher the sound generation efficiency. Different thicknesses of the vibrating layer 10 require different heights and arrangements of the spacer layers 2. In one embodiment: the height of the spacer protrusion 21 is 80±10µm, the height of the spacer 23 is 60±10µm, the height difference between the spacer protrusion 21 and the spacer 23 is 10±2µm, the width of the spacer groove 22 is 0.4mm, the distance between the center points of the spacer protrusion 21 and the spacer 23 is 0.7mm, the thickness of the vibrating layer 10 is 8µm, the sheet resistance of the conductive base plate is below 10mΩ, and the sound-emitting layer can achieve a sound pressure level of 80-90dB at a frequency of 1kHz. In another embodiment, the total thickness of the protective layer 9 and the display layer 5 is 100µm, the surfaces of the spacer protrusion 21 and the spacer 23 are conductive, the height of the spacer protrusion 21 is 50µm±10µm, the height of the spacer 23 is 40µm±10µm, the height difference between the spacer protrusion 21 and the spacer 23 is 6±2µm, the width of the spacer groove 22 is 0.6µm, and the larger the center distance between the spacer protrusions 21 and the spacer 23, the lower the frequency. In one embodiment, the total thickness of the protective layer 9 and the display layer 5 is 200 μm. The surfaces of the spacer protrusion 21 and the spacer 23 are conductive. The height of the spacer protrusion 21 is 30 μm ± 10 μm, the height of the spacer 23 is 20 μm ± 10 μm, the height of the spacer 23 is 5 ± 2 μm, and the width of the spacer groove 22 is 1.0 μm. The thicker the vibrating layer 10, the lower the maximum sound pressure level of the overall curve, indicating lower sound generation efficiency.

[0040] Preferably, the vibrating layer 10 and the non-vibrating layer 20 are designed in a frame-attached form, specifically, the insulating layer 14 of the vibrating layer 10 and the conductive base plate are frame-attached. When attaching the vibrating layer 10 and the non-vibrating layer 20, a heating tensioning process or a fixture tensioning process can be used for tensioning. Specific tensioning processes can be found in the description of the previously filed application CN202210469615.3, entitled "A Tensioning Process for the Vibrating Layer of a Directional Sound-Emitting Display Screen," and will not be repeated here. The vibrating layer 10 needs to maintain a constant pretension after the finished product is attached. During reliability testing, large changes in pretension can lead to wrinkles in the vibrating layer and functional failure. To ensure that the tension of the vibrating layer 10 is within a certain range, the aforementioned tensioning process can be used.

[0041] In other embodiments, the spacer layer 2 may not be limited to being disposed on the conductive base plate of the non-vibrating layer 20, but may be disposed on any layer of the vibrating layer 10, such as on the display layer 5 or on the conductive layer 61, as long as the spacer layer and the layer therein are conductive as a whole and the resistivity is in the milliohm range.

[0042] The present invention also discloses a display device including the aforementioned sound-emitting layer, such as electronic devices that require display devices, such as computers, televisions, and tablets. That is, the present invention can be applied to various display fields, and can also emit sound in a directional manner while realizing display, with good privacy.

[0043] The advantage of this invention is that by adding a spacer groove between the spacer protrusions, the presence of the spacer groove can increase the vibration cavity of the sound-generating layer, thereby reducing the resonant frequency parameter that drives the sound generation. In other words, under the same sound pressure level, by increasing the cavity, the resonant frequency can be reduced and the resonant frequency is more stable, which also reduces the requirements of the processing technology.

[0044] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A spacer structure for a sound-emitting layer, characterized in that, The spacing structure includes: grassroots level; A spacer layer is disposed on the base layer. The spacer layer includes multiple spacer protrusions spaced apart in a first direction. Each spacer protrusion extends on the base layer in a second direction perpendicular to the first direction. A spacer groove is formed between two adjacent spacer protrusions to provide space for sound generation. Each spacer protrusion is provided with multiple spacer members spaced apart and protruding away from the surface of the spacer protrusion. The height difference between the upper surface of the spacer member and the bottom surface of the spacer groove is more than 35 μm. The height difference between the surface of the spacer member and the surface of the spacer protrusion is 2 μm to 1 mm. The center distance between two adjacent spacer members on each spacer protrusion is 10 μm to 2 cm. The base layer and the spacer layer are electrically conductive as a whole.

2. The spacer structure of the sound-emitting layer as described in claim 1, characterized in that, The spacer layer is integrally formed with the base layer, or the spacer layer is formed by processing on the base layer.

3. The spacer structure of the sound-emitting layer as described in claim 1, characterized in that, The base layer is a conductive plate, and the spacer layer is disposed on the conductive plate. The conductive plate and the spacer layer are conductive as a whole.

4. A sound-emitting layer, characterized in that, The sound-emitting layer includes the spacer structure described in any one of claims 1 to 3.

5. A sound-generating layer as described in claim 4, characterized in that, The sound-generating layer includes a vibrating layer and a non-vibrating layer. The non-vibrating layer includes the spacer structure described in any one of claims 1 to 3. The vibrating layer includes a conductive layer. The spacer layer is disposed between the conductive layer and the base layer to provide the air gap required for the vibration of the vibrating layer.

6. A sound-generating layer as described in claim 5, characterized in that, The sound-generating layer further includes an insulating layer, which is disposed at least between the conductive layer and the spacer layer.

7. A sound-generating layer as described in claim 6, characterized in that, The sound-emitting layer also includes edge traces, and the edge traces are provided on the edges of the base layer and / or the edges of the conductive layer.

8. A display device, characterized in that, The display device includes the sound-emitting layer as described in any one of claims 4 to 7.

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