A low-polarization directional sound-emitting screen and its preparation process

Abstract

The present invention discloses a low-polarization directional sound-emitting screen and a preparation process thereof. The directional sound-emitting screen comprises a vibration layer and a non-vibration layer. The present invention preferably adopts a fluoroplastic material with low dielectric loss, high breakdown field strength, small number of polar groups, high molecular weight and high crystallinity for the insulating layer between the vibration layer and the non-vibration layer. At the same time, by adjusting the position of the supporting pattern and the conductive layer on the non-vibration layer, the dielectric layer between the two conductive layers of the vibration layer and the non-vibration layer is reduced. The combination of the two can reduce the sound pressure drop problem of the directional sound-emitting screen caused by the negative polarization voltage brought by the dielectric.

Description

Technical Field

[0001] The invention relates to the technical field of directional sound emission, and in particular to a low-polarization directional sound emission screen and a preparation process thereof. Background Art

[0002] Ultra-thin, narrow-frame, and even full-screen designs of display devices leave less and less space for sound-generating devices. Traditional sound-generating devices are large in size and have limited installation locations. It is difficult to find a suitable location and space in the new generation of display devices. Therefore, it is necessary to redesign the sound-generating device that can adapt to the needs of current display devices.

[0003] Some display device manufacturers have designed a way to use the screen to generate sound. As a surface audio technology, screen sound technology provides a new solution for the sound of multimedia audio-visual equipment. Currently, transparent screen directional speakers that combine display devices with ultrasonic transducers are being developed.

[0004] When the traditional directional sound display screen is subjected to reliability testing, the sound of the directional sound display screen will decrease to a certain extent as the aging time increases. Generally, a high-humidity environment is more demanding than a pure high-temperature environment. Reason: There is a layer of dielectric in the structure of the directional sound screen, which plays an insulating role. For existing directional transparent sound screens, the insulating layer material generally selects OC (acrylic resin) or photosensitive dry film (such as epoxy acrylic resin) or silk screen ink (such as urethane acrylic resin). When these materials are in the working state of the directional sound display screen, after the electrode is powered on, due to the action of DC and AC electric fields, the dielectric will be polarized to a certain extent, and the dielectric layer will generate a reverse voltage, which is equivalent to the voltage drop across the capacitor and the sound pressure reduction. Summary of the invention

[0005] The object of the present invention is to provide a low-polarization directional sound-emitting screen and a preparation process thereof.

[0006] To achieve the above objectives, on the one hand, the present invention provides a low-polarization directional sound screen, comprising:

[0007] A vibration layer, the vibration layer comprising a vibration substrate layer, a first conductive layer and an insulating layer, the first conductive layer being entirely formed on a surface of the vibration substrate layer close to the non-vibration layer, the insulating layer being entirely formed on a surface of the first conductive layer close to the non-vibration layer, and the insulating layer being made of fluoroplastic;

[0008] A non-vibration layer is attached to the frame of the vibration layer, the non-vibration layer includes a non-vibration substrate layer, a support pattern and a second conductive layer, the support pattern is formed on the surface of the non-vibration substrate layer close to the vibration layer, the support pattern is a plurality of insulating bumps arranged at intervals, the second conductive layer is formed entirely on the surface of the support pattern close to the vibration layer, and the portion covering the insulating bumps forms a convex portion correspondingly;

[0009] After the vibration layer and the non-vibration layer frame are attached to each other, an air gap is formed between the two for the vibration layer to vibrate up and down and produce sound.

[0010] In a preferred embodiment, the insulating layer material is polytetrafluoroethylene or ethylene-tetrafluoroethylene copolymer.

[0011] In a preferred embodiment, the insulating layer of the vibration layer is fixed to the second conductive layer of the non-vibration layer.

[0012] In a preferred embodiment, the insulating layer and the second conductive layer are fixed via bonding points, the bonding points are formed on the surface of the insulating layer close to the second conductive layer, and the bonding points are arranged at positions on the insulating layer corresponding to the positions of the raised portions on the non-vibrating substrate layer, each of the bonding points corresponds to one of the raised portions, or a bonding point is arranged on each of the raised portions on the non-vibrating substrate layer.

[0013] In a preferred embodiment, the bonding point is formed on the insulating layer or the protruding portion by a printing process or a dispensing process, the printing process includes 3D printing or non-3D printing, and the height of the bonding point is 1um to 2um.

[0014] In a preferred embodiment, the insulating layer includes an insulating base layer and an insulating protrusion, the insulating base layer is entirely formed on the surface of the first conductive layer close to the non-vibration layer, the insulating protrusion is formed on the surface of the insulating base layer close to the non-vibration layer, and an embedded gap is formed between two adjacent insulating protrusions, the position of the embedded gap corresponds to the position of the protrusion on the non-vibration layer, and its depth is greater than the height of the protrusion, and the protrusion on the non-vibration layer is embedded in the corresponding embedded gap when the vibration layer and the non-vibration layer are bonded together, and the air gap is formed between the embedded gap.

[0015] In a preferred embodiment, the insulating protrusion is formed on a release film, and the release film is embedded in the embedding gap before the vibration layer and the non-vibration layer are bonded together, and is torn off during bonding to expose the embedding gap for the protrusion on the non-vibration layer to be embedded.

[0016] In a preferred embodiment, the thickness of the vibration layer is 125um~130um, the height of the insulating bumps is 7um~12um, and the center distance between the insulating bumps is 2.4mm~3.0mm; or the thickness of the vibration layer is 150um~200um, the height of the insulating bumps is 7um~10um, and the center distance between the insulating bumps is 4mm~5mm.

[0017] In a preferred embodiment, the vibration substrate layer is a touch display layer, and the first conductive layer is entirely formed on a surface of the vibration substrate layer close to the non-vibration layer.

[0018] On the other hand, the present invention proposes a preparation process of a low-polarization directional sound-emitting screen, wherein the low-polarization directional sound-emitting screen adopts the above-mentioned low-polarization directional sound-emitting screen, and the process comprises:

[0019] S1, preparing a vibration layer, including: forming a first conductive layer on the entire surface of the vibration substrate layer close to the non-vibration layer, and forming an insulating layer on the entire surface of the first conductive layer close to the non-vibration layer;

[0020] S2, preparing a non-vibration layer, including: forming a support pattern on a surface of the non-vibration substrate layer close to the vibration layer, and forming a second conductive layer on the entire surface of the support pattern close to the vibration layer;

[0021] S3, attaching the frames of the vibration layer and the non-vibration layer together.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The present invention adopts a fluoroplastic material with low dielectric loss, high breakdown field strength, small number of polar groups, high molecular weight and high crystallinity for the insulating layer; at the same time, by adjusting the position of the supporting pattern and the conductive layer on the non-vibration layer, the dielectric layer between the two conductive layers of the vibration layer and the non-vibration layer is reduced, and the combination of the two can reduce the sound pressure drop problem of the directional sound screen caused by the negative polarization voltage brought by the dielectric.

[0024] 2. In the present invention, while the non-vibration layer and the vibration layer are bonded together as a frame, the insulating layer of the vibration layer is fixed to the second conductive layer of the non-vibration layer, so that after the non-vibration layer and the vibration layer are bonded together, stable vibration units can be formed. In this way, the vibration layer will not be separated from the non-vibration layer when vibrating up and down, thereby eliminating the invalid vibration distance of the vibration layer, which can not only reduce the sound distortion of the entire directional sound screen, but also reduce the driving power of the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the stacked structure of a directional sound-emitting screen (vibration layer and non-vibration layer) in one embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of the stacked structure of a directional sound-emitting screen (a vibration layer and a non-vibration layer are fixed by bonding points) in one embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of the stacked structure of a directional sound-emitting screen (the insulating layer is a composite structure of an insulating base layer and an insulating protrusion) in one embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of the stacked structure of a directional sound-emitting screen (the insulating layer is a composite structure of an insulating base layer and an insulating protrusion and has a release film) in one embodiment of the present invention;

[0029] Figure 5 It is a schematic diagram of the stacked structure of a directional sound-emitting screen (a vibration layer is attached to a carrier film or a carrier glass) in one embodiment of the present invention;

[0030] Figure 6 It is a schematic diagram of the process of preparing a directional sound-emitting screen in one embodiment of the present invention;

[0031] The accompanying drawings are marked as follows:

[0032] 1. Vibration layer, 11. Vibration substrate layer, 111. Dimming layer, 112. Touch display layer, 113. TFE film encapsulation layer, 114. OLED light-emitting layer, 115. TFT circuit layer, 12. First conductive layer, 13. Insulating layer, 131. Insulating base layer, 132. Insulating protrusion, 133. Embedded gap, 14. First edge routing, 2. Non-vibration layer, 21. Non-vibration substrate layer, 22. Support pattern / insulating bump, 23. Second conductive layer, 24. Protrusion, 25. Second edge routing, 3. Bonding point, 4. Release film, 5. UV or low-temperature anti-adhesion adhesive, 6. Carrier film or carrier glass. DETAILED DESCRIPTION

[0033] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0034] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0035] Combination Figure 1 to Figure 4As shown, a low-polarization directional sound-emitting screen disclosed by the present invention comprises a vibration layer 1 and a non-vibration layer 2 which is bonded to the vibration layer 1 in a frame. The present invention preferably adopts a fluoroplastic material with low dielectric loss, high breakdown field strength, small number of polar groups, high molecular weight and high crystallinity for the insulating layer between the vibration layer 1 and the non-vibration layer 2; at the same time, by adjusting the position of the supporting pattern and the conductive layer on the non-vibration layer 2, the dielectric layer between the two conductive layers of the vibration layer 1 and the non-vibration layer 2 is reduced, and the combination of the two can reduce the sound pressure drop problem of the directional sound-emitting screen caused by the negative polarization voltage brought by the dielectric.

[0036] The vibration layer 1 is used as an acoustic vibration layer, which specifically includes a vibration substrate layer 11, a first conductive layer 12 and an insulating layer 13. In this embodiment, the vibration substrate layer 11 is a touch display layer, which includes a dimming layer 111 (such as POL, polarizer), a touch display layer 112, a TFE film encapsulation layer 113, an OLED light-emitting layer 114 and a TFT circuit layer 115 from top to bottom. Of course, the present invention is not limited to the touch display layer structure mentioned here, and touch display layers of other existing structures are also applicable to the present invention. And if it is not integrated with the touch display layer, the vibration substrate layer 11 here can also be implemented by a flexible film, such as a PET film. The first conductive layer 12 is formed on the surface of the vibration substrate layer 11 close to the non-vibration layer 2. During implementation, the first conductive layer 12 can be implemented by a high-transmittance material such as nanosilver, indium tin oxide, metalmesh, carbon nanotubes or graphene, or a non-transparent conductive material: such as copper or copper-doped oxide or silver or gold. The lower the square resistance, the higher the overall sound efficiency of the directional sound screen, and the square resistance is preferably selected to be less than 10 ohms. In addition, in order to further improve the conductivity of the first conductive layer 12, a first edge wiring 14 can be added at least one edge of the surface of the first conductive layer 12 close to the non-vibration layer 2. During implementation, the first edge wiring 14 is also implemented with copper or copper-doped oxide or silver or gold.

[0037] The whole surface of insulating layer 13 is formed on the surface of first conductive layer 12 near non-vibration layer 2, covering first edge routing 14. Different from the adoption of existing insulating layer 13, the present invention preferably adopts low dielectric loss, high breakdown field strength, few polar groups, high molecular weight, high crystallinity material, and the polarization degree of this material polarized by the effect of external electric field is low. In a preferred embodiment, insulating layer 13 material can be selected PTFE (polytetrafluoroethylene), fluorine atoms and carbon atoms in PTFE molecules are alternately arranged, and there is no asymmetric part in the molecule of PTFE, so its polarizability is very small. Therefore, PTFE will not be significantly polarized under normal circumstances. In another preferred embodiment, ETFE (ethylene-tetrafluoroethylene copolymer) can also be adopted.

[0038] During implementation, the vibration layer 1 can make sound on the entire surface, or it can be divided into zones as needed, specifically by making a pattern design on the first conductive layer 12. In a specific embodiment, the first conductive layer 12 can be divided into zones, and adjacent zones can be insulated and separated by a non-conductive layer (such as etching the first conductive layer 12, not shown). During implementation, the line width of the non-conductive layer can be selected to be less than 50um. The smaller the line width, the higher the visualization effect of the directional sound screen. The width of the zone (i.e., with a conductive layer) can be set according to the directional sound deflection design. In a specific embodiment, the zone width can be designed to be 8mm wide.

[0039] The non-vibration layer 2 is a non-vibration substrate layer, which specifically includes a non-vibration substrate layer 21, a support pattern 22, and a second conductive layer 23. Preferably, in this embodiment, the support pattern 22 is formed on the surface of the non-vibration substrate layer 21 close to the vibration layer 1, and the support pattern 22 is specifically a plurality of insulating bumps arranged at intervals. The second conductive layer 23 is formed on the surface of the support pattern 22 close to the vibration layer 1, and the portion covering the insulating bumps forms a convex portion 24. Different from the existing position setting of the support pattern 22 and the second conductive layer 23, the existing second conductive layer 23 is first formed on the surface of the non-vibration substrate layer 21 close to the vibration layer 1, and then the support pattern 22 is formed on the surface of the second conductive layer 23 close to the vibration layer 1. The present invention can avoid sandwiching another layer of the support pattern dielectric layer between the second conductive layer 23 and the first conductive layer 12 by changing the setting position of the support pattern 22 and the second conductive layer 23, thereby reducing the dielectric layer between the two conductive layers of the vibration layer 1 and the non-vibration layer 2, and further reducing the sound pressure drop problem of the directional system caused by the negative polarization voltage brought by the dielectric.

[0040] In addition, in order to improve the conductivity of the second conductive layer 23, a second edge wiring 25 can be added at least one edge of the surface of the second conductive layer 23 close to the vibration layer 1. Similarly, during implementation, the second edge wiring 25 is also implemented using copper or copper-doped oxide or silver or gold.

[0041] In addition, the insulating layer 13 of the vibration layer 1 and the second conductive layer 23 of the non-vibration layer 2 are preferably fixed to each other. In a specific embodiment, Figure 2As shown, the insulating layer 13 and the second conductive layer 23 are fixed by bonding points 3. Specifically, the bonding points 3 can be formed on the surface of the insulating layer 13 close to the second conductive layer 23, and the setting position of the bonding points 3 on the insulating layer 13 corresponds to the position of the protrusions 24 on the non-vibration substrate layer 2, that is, each bonding point 3 corresponds to a protrusion 24, or a bonding point 3 is set on each protrusion 24 on the non-vibration substrate layer 21. The height of the bonding point 3 is as small as possible, preferably 1um to 2um. The present invention fixes the insulating layer 13 of the vibration layer 1 with the second conductive layer 23 of the non-vibration layer 2, so that after the non-vibration layer 2 and the vibration layer 1 are attached, stable vibration units can be formed one by one, so that the vibration layer 1 will not be separated from the non-vibration layer 2 when vibrating up and down, thereby eliminating the invalid vibration distance of the vibration layer 1, which can not only reduce the sound distortion of the entire directional sound screen (in a specific implementation case, the design of the bonding point 3 can effectively reduce the total harmonic distortion THD of 1KHz from 20% to less than 5%), but also reduce the driving power of the entire product and improve reliability. During implementation, the bonding point 3 can be formed on the insulating layer 13 or the protrusion 24 by a printing process or a dispensing process, and the printing process includes high-precision 3D printing or non-3D printing. In other alternative embodiments, the insulating layer 13 and the second conductive layer 23 can also be fixed by an adhesive layer (not shown in the figure), and the adhesive layer can preferably be formed on the entire surface of the insulating layer 13 close to the non-vibration layer 2.

[0042] In another embodiment, in combination Figure 3 and Figure 4As shown, the insulating layer 13 specifically includes an insulating base layer 131 and an insulating protrusion 132, wherein the insulating base layer 131 is formed on the surface of the first conductive layer 12 close to the non-vibration layer 2, and the insulating protrusion 132 is formed on the surface of the insulating base layer 131 close to the non-vibration layer 2, and an embedded gap 133 is formed between two adjacent insulating protrusions 132, and the position of the embedded gap 133 corresponds to the position of the protrusion 24 on the non-vibration layer 2, and the width of the embedded gap 133 is the same as or slightly larger than the width of the protrusion 24, and the depth is greater than The height of the raised portion 24 is such that the raised portion 24 on the non-vibration layer 2 can be embedded in the corresponding embedded gap 133 when the vibration layer 1 and the non-vibration layer 2 are attached to each other, and an air gap (not shown) required for the vibration layer 1 to vibrate can be formed between the raised portion 24 and the embedded gap 133. The embedded gap 133 and the raised portion 24 are designed to be embedded in each other, so that the vibration layer 1 will not be separated from the non-vibration layer 2 when vibrating up and down, thereby reducing the sound distortion of the entire directional sound screen, reducing the driving power of the entire device, and improving the overall reliability of the product. During implementation, the insulating base layer 131 and the insulating raised portion 132 are made of the same material, and both are made of materials with a small number of polar groups, high molecular weight, and high crystallinity. For details, please refer to the above description of the selection of the insulating layer material, which will not be repeated here. In addition, during preparation, the insulating protrusion 132 can be formed on a release film 4, and then the insulating base layer 131 is made on the entire surface of the release film 4. The release film 4 is embedded in the embedding gap 133 before the vibration layer 1 and the non-vibration layer 2 are bonded together, so that two adjacent insulating protrusions 132 are insulated and separated from each other, and when bonding, the embedding gap 133 is torn off to expose the protrusion 24 on the non-vibration layer 2 for embedding.

[0043] Combination Figure 5 As shown, when the vibration layer 1 and the non-vibration layer 2 are bonded, the side of the vibration layer 1 away from the non-vibration layer 2 can be firstly bonded to a carrier film or a carrier glass 6 through UV or low-temperature viscosity-reducing adhesive 5, and then a clamp (not shown) is used to apply tension to the carrier film or the carrier glass 6, so that the vibration layer 1 can be guaranteed to be flat to a certain extent and obtain a certain tension. After the vibration layer 1 and the non-vibration layer 2 are bonded, the carrier film or the carrier glass 6 can be separated from the bonded vibration layer 1. The process design of the present invention of tensioning the vibration layer 1 through the carrier film or the carrier glass 6 before bonding can also ensure that the vibration layer 1 can be kept from loosening for a long time during operation, thereby improving the sound pressure level and reliability of the product.

[0044] In a specific embodiment, the thickness of the vibration layer 1 is 125um to 130um, the height of the matching insulating bump 22 is 7um to 12um (preferably 10um to 12um), and the center spacing between the insulating bumps 22 is 2.4mm to 3.0mm (preferably 2.6mm to 2.8mm); in another embodiment, the thickness of the vibration layer 1 is 150um to 200um (such as 188um), the height of the matching insulating bump 22 is 7um to 10um, and the center spacing between the insulating bumps 22 is 4mm to 5mm. The higher the height of the insulating bump, the smaller the reverse polarization voltage caused by the insulating layer medium under the working voltage, thereby improving efficiency and performance, but the lower the height of the support pattern 22, the better the visualization effect of the product.

[0045] Combination Figure 6 As shown, the preparation process of a low-polarization directional sound-emitting screen disclosed in the present invention mainly includes the following steps:

[0046] S1, preparing the vibration layer 1, including: forming a first conductive layer 12 on the entire surface of the vibration substrate layer 11 close to the non-vibration layer 2, and forming an insulating layer 13 on the entire surface of the first conductive layer 12 close to the non-vibration layer 2.

[0047] Specifically, in this embodiment, the first conductive layer 12 is first formed on the entire surface of the touch display layer 112 close to the non-vibration layer 2, and then the first edge wiring 14 is formed in a circle on the surface of the first conductive layer 12 close to the non-vibration layer 2, and then the insulating layer 13 covering the first edge wiring 14 is formed on the entire surface of the first conductive layer 12 close to the non-vibration layer 2.

[0048] S2, preparing the non-vibration layer 2, including: making a support pattern 22 on the surface of the non-vibration substrate layer 21 close to the vibration layer 1, and making a second conductive layer 23 on the entire surface of the support pattern 22 close to the vibration layer 1.

[0049] Specifically, in this embodiment, a support pattern 22 is first formed on the surface of the non-vibration substrate layer 21 close to the vibration layer 1, and then a second conductive layer 23 is formed on the entire surface of the support pattern 22 close to the vibration layer 1. The second conductive layer 23 covers the non-vibration substrate layer 21 and the support pattern 22, and the portion covering the insulating protrusion 22 forms a protrusion 24. Then, a second edge trace 25 is formed around the edge of the surface of the second conductive layer 23 close to the vibration layer 1.

[0050] In addition, in order to fix the insulating layer 13 of the vibration layer 1 and the second conductive layer 23 of the non-vibration layer 2 after the vibration layer 1 and the non-vibration layer 2 are attached to each other, a bonding point 3 is formed on each protrusion 24 on the non-vibration substrate layer 2 or on the surface of the insulating layer 13 close to the second conductive layer 23, or an adhesive layer is formed on the entire surface of the insulating layer 13 close to the non-vibration layer 2. Alternatively, the above insulating layer 13 is set to a composite structure of an insulating base layer 131 plus an insulating protrusion 132. Among them, the preparation process of the insulating base layer 131 plus the insulating protrusion 132 can refer to the description of the directional sound screen structure above, and will not be repeated here.

[0051] S3, attaching the frames of the vibration layer 1 and the non-vibration layer 2 together.

[0052] Specifically, the side of the vibration layer 1 away from the non-vibration layer 2 is first attached to a carrier film or a carrier glass 6 by UV or low-temperature viscosity-reducing adhesive 5, and then a clamp is used to apply tension to the carrier film or the carrier glass 6, so that the vibration layer can be flat to a certain extent and obtain a certain tension. Then, the frame of the vibration layer 1 and the non-vibration layer 2 are attached together. After the vibration layer 1 and the non-vibration layer 2 are attached, the carrier film or the carrier glass 6 is separated from the attached vibration layer 1.

[0053] The advantages of the present invention are as follows: 1. The present invention adopts a fluoroplastic material with low dielectric loss, high breakdown field strength, small number of polar groups, high molecular weight and high crystallinity for the insulating layer; at the same time, by adjusting the position of the support pattern and the conductive layer on the non-vibration layer, the dielectric layer between the two conductive layers of the vibration layer and the non-vibration layer is reduced, and the combination of the two reduces the sound pressure drop problem of the directional system caused by the negative polarization voltage brought by the dielectric. 2. While the present invention is bonding the non-vibration layer and the vibration layer as a frame, the insulating layer of the vibration layer is fixed to the second conductive layer of the non-vibration layer, so that after the non-vibration layer and the vibration layer are bonded, stable vibration units can be formed, so that the vibration layer will not separate from the non-vibration layer when vibrating up and down, thereby eliminating the invalid vibration distance of the vibration layer, which can not only reduce the sound distortion of the entire directional sound screen, but also reduce the driving power of the entire device.

[0054] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A low polarization directional sound screen, characterized in that: The directional sound screen comprises: A vibration layer, the vibration layer comprising a vibration substrate layer, a first conductive layer and an insulating layer, the first conductive layer being entirely formed on a surface of the vibration substrate layer close to the non-vibration layer, the insulating layer being entirely formed on a surface of the first conductive layer close to the non-vibration layer, and the insulating layer being made of fluoroplastic; A non-vibration layer is attached to the frame of the vibration layer, the non-vibration layer includes a non-vibration substrate layer, a support pattern and a second conductive layer, the support pattern is formed on the surface of the non-vibration substrate layer close to the vibration layer, the support pattern is a plurality of insulating bumps arranged at intervals, the second conductive layer is formed entirely on the surface of the support pattern close to the vibration layer, and the portion covering the insulating bumps forms a convex portion correspondingly; After the vibration layer and the non-vibration layer frame are attached to each other, an air gap is formed between the two for the vibration layer to vibrate up and down and produce sound; The insulating layer includes an insulating base layer and an insulating protrusion. The insulating base layer is entirely formed on the surface of the first conductive layer close to the non-vibration layer. The insulating protrusion is formed on the surface of the insulating base layer close to the non-vibration layer. An embedded gap is formed between two adjacent insulating protrusions. The position of the embedded gap corresponds to the position of the protrusion on the non-vibration layer, and its depth is greater than the height of the protrusion. When the vibration layer and the non-vibration layer are bonded together, the protrusion on the non-vibration layer is embedded in the corresponding embedded gap and forms the air gap between the protrusion and the embedded gap.

2. The low-polarization directional sound screen according to claim 1, characterized in that: The insulating layer material is polytetrafluoroethylene or ethylene-tetrafluoroethylene copolymer.

3. The low polarization directional sound screen according to claim 1, characterized in that: The insulating layer of the vibration layer is fixed to the second conductive layer of the non-vibration layer.

4. The low polarization directional sound screen according to claim 3, characterized in that: The insulating layer and the second conductive layer are fixed via bonding points, and the bonding points are formed on the surface of the insulating layer close to the second conductive layer. The bonding points are arranged at positions on the insulating layer corresponding to positions of raised portions on the non-vibrating substrate layer. Each bonding point corresponds to one raised portion, or one bonding point is arranged on each raised portion on the non-vibrating substrate layer.

5. The low polarization directional sound screen according to claim 4, characterized in that: The bonding points are formed on the insulating layer or the protruding portion by a printing process or a dispensing process, the printing process includes 3D printing or non-3D printing, and the height of the bonding points is 1um to 2um.

6. The low polarization directional sound screen according to claim 1, characterized in that: The insulating protrusion is formed on a release film, and the release film is embedded in the embedding gap before the vibration layer and the non-vibration layer are attached to each other, and is torn off during the attachment to expose the embedding gap for the protrusion on the non-vibration layer to be embedded.

7. The low polarization directional sound screen according to claim 1, characterized in that: The thickness of the vibration layer is 125um to 130um, the height of the insulating bumps is 7um to 12um, and the center spacing between the insulating bumps is 2.4mm to 3.0mm; or the thickness of the vibration layer is 150um to 200um, the height of the insulating bumps is 7um to 10um, and the center spacing between the insulating bumps is 4mm to 5mm.

8. The low polarization directional sound screen according to claim 1, characterized in that: The vibration substrate layer is a touch display layer, and the first conductive layer is entirely formed on a surface of the vibration substrate layer close to the non-vibration layer.

9. A process for preparing a low-polarization directional sound-emitting screen, characterized in that: The low-polarization directional sound-emitting screen adopts the low-polarization directional sound-emitting screen according to any one of claims 1 to 8, and the process includes: S1, preparing a vibration layer, including: forming a first conductive layer on the entire surface of the vibration substrate layer close to the non-vibration layer, and forming an insulating layer on the entire surface of the first conductive layer close to the non-vibration layer; S2, preparing a non-vibration layer, including: forming a support pattern on a surface of the non-vibration substrate layer close to the vibration layer, and forming a second conductive layer on the entire surface of the support pattern close to the vibration layer; S3, attaching the frames of the vibration layer and the non-vibration layer together.

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