Directional sounding touch display folding screen and preparation process thereof

Abstract

The invention discloses a directional sound production touch control display folding screen and a preparation process thereof.The folding screen comprises a touch control cover plate layer and a display sound production layer, the display sound production layer comprises a display layer and a sound production layer, and the sound production layer comprises a first substrate, a first conductive layer and a first hydrophobic anti-corrosion layer; the non-vibration layer comprises at least two non-vibration areas which are separated independently, each non-vibration area comprises a conductive second substrate, an insulating layer, a microstructure and a second hydrophobic anti-corrosion layer, and the microstructure is formed by integrally processing a substrate layer which is located on the insulating layer and is made of the same material as the second substrate; the upper end part, close to the vibration layer, of the vibration layer is embedded and fixed in the first hydrophobic anti-corrosion layer, an air gap is formed between the vibration layer and the non-vibration layer through the remaining protruding parts, and the vibration layer vibrates up and down under the action of externally applied driving voltage to perform directional sound production. While multiple functions of directional sounding, touch display and the like of the directional sounding touch display folding screen are realized, the overall working reliability of the product is improved, and the screen can be completely folded.

Description

Technical Field

[0001] This invention relates to the field of directional sound technology for screens, specifically to a directional sound-emitting touch display foldable screen and its manufacturing process. Background Technology

[0002] With the development of display technology, consumers are not only demanding high-quality and clear images from display devices, but are also increasingly focusing on sound output effects. They tend to prefer display devices that can achieve perfect integration of sound and image, seamlessly blending the displayed image with the played sound.

[0003] Existing technologies for achieving sound and image integration in display devices utilize screen-based sound generation technology. The principle behind this is to use vibrating elements to drive the screen to vibrate and produce sound. For example, a resonant screen-based sound generation solution involves attaching a vibrating device to the bottom of the screen or the frame of the device. When the device operates, it vibrates, ultimately causing the screen to vibrate and produce sound. Another example is a direct-drive screen-based sound generation solution, where the device consists of two parts: one part is directly attached to the screen, and the other part is fixed to the frame. When the device operates, the two parts generate mutual attraction or repulsion, thereby driving the screen to vibrate and produce sound. Compared to the resonant screen-based sound generation solution, this method offers improved conversion efficiency.

[0004] When electronic devices feature foldable displays, the area available for display can be significantly increased, providing users with a better visual experience. Foldable displays are increasingly being used in various types of terminal devices and show great promise.

[0005] Therefore, how to combine screen directional sound with touch and display, so that the display can integrate screen directional sound, display and touch functions into one, and make the directional sound display screen foldable after the combination, are the problems that need to be solved. Summary of the Invention

[0006] The purpose of this invention is to provide a foldable directional sound-emitting touch display screen that combines a touch display screen with a directional sound-emitting screen and its manufacturing process.

[0007] To achieve the above objectives, the present invention proposes a directional sound-emitting touch display foldable screen, comprising:

[0008] A vibration layer, comprising a touch cover layer and a display sound layer, the display sound layer comprising a display layer and a sound layer, the display layer being located between the touch cover layer and the sound layer, the sound layer comprising a first substrate, a first conductive layer and a first hydrophobic anti-corrosion layer, the first substrate being disposed on the surface of the display layer away from the client, the first conductive layer being disposed on the surface of the first substrate away from the display layer, and the first hydrophobic anti-corrosion layer being disposed on the surface of the first conductive layer away from the first substrate;

[0009] The non-vibration layer includes at least two independently spaced non-vibration regions. Each non-vibration region includes a conductive second substrate, an insulating layer, a microstructure, and a second hydrophobic anti-corrosion layer. The insulating layer is disposed on the surface of the second substrate near the vibration layer. The microstructure is formed on the insulating layer and is integrally formed from a substrate layer of the same material as the second substrate located on the insulating layer. It consists of a plurality of protrusions arranged in an array. The second hydrophobic anti-corrosion layer is disposed on the surface of the insulating layer other than the microstructure. The microstructure protrudes from the surface of the second hydrophobic anti-corrosion layer, and its upper part near the vibration layer is embedded and fixed in the first hydrophobic anti-corrosion layer. The remaining protruding part forms an air gap between the vibration layer and the non-vibration layer.

[0010] The vibrating layer vibrates up and down under the action of an externally applied driving voltage to produce directional sound.

[0011] In a preferred embodiment, the first hydrophobic anti-corrosion layer is a porous aerogel layer, and / or the density of the porous aerogel layer is at least 22 mg / cm³. 3 And / or, the porous aerogel layer is formed at least twice, and is non-adhesive in the last forming process, while is adhesive in the remaining forming processes to fix the embedded microstructure; and / or, each forming process of the porous aerogel layer is UV curing, thermosetting, or 3D printing, and the temperature of UV curing and thermosetting is below 100°.

[0012] Alternatively, the first hydrophobic anti-corrosion layer comprises a thermoplastic polyurethane rubber layer and a waterproof layer, wherein the thermoplastic polyurethane rubber layer is disposed on the surface of the insulating layer away from the first conductive layer, the waterproof layer is disposed on the surface of the thermoplastic polyurethane rubber layer away from the insulating layer, and / or the Young's modulus of the thermoplastic polyurethane rubber layer is less than 100 Pa.

[0013] In a preferred embodiment, the microstructure is formed by laser and photolithography on the surface of the substrate layer near the vibration layer on the insulating layer; and / or, the second substrate is a SUS steel plate with a thickness of 20um~50um or more than 100um or a carbon fiber plate with a thickness of more than 100um and a conductive surface; and / or, the third substrate is an ultrathin glass UTG with a thickness of less than 100um or a flexible glass UFG with unequal thickness.

[0014] In a preferred embodiment, the touch cover layer includes a third substrate and an ITO layer with a conductive pattern, the ITO layer being disposed on the surface of the third substrate near or away from the client.

[0015] Alternatively, the touch cover layer includes a third substrate, an upper ITO layer and a lower ITO layer, both with conductive patterns, wherein the upper ITO layer and the lower ITO layer are respectively disposed on the upper surface of the third substrate near the client and the lower surface away from the client.

[0016] In a preferred embodiment, the non-AA regions of the vibrating layer and the non-vibrating layer are bonded together and are provided with at least one vent hole; and / or, the sheet resistance of the first conductive layer is less than 10Ω and the thickness is in the nanometer range; and / or, the insulating layer is an organic-inorganic composite material with a dielectric constant between 2 and 6 at 1MHz, and the organic-inorganic composite material is doped with boron nitride micro-nano particles; and / or, the first conductive layer and the second conductive layer are steel alloy conductive layers, silicon steel alloy conductive layers, carbon nanotube conductive layers, or graphene conductive layers.

[0017] In a preferred embodiment, the display layer includes a polarizing layer with pressure-sensitive adhesive, an encapsulation layer, and a thin-film transistor layer. The polarizing layer is disposed between the touch cover layer and the encapsulation layer, and the thin-film transistor layer is disposed between the encapsulation layer and the sound-emitting layer.

[0018] In a preferred embodiment, both the encapsulation layer and the thin-film transistor layer are formed by low-temperature chemical or physical vapor deposition on the first substrate.

[0019] In a preferred embodiment, the touch cover layer further includes an optical layer or an optical layer and a buffer layer, wherein the thickness of the optical layer is less than 5 μm and it is a composite layer of one or more of the following: anti-glare, anti-reflection, and anti-fingerprint; and / or, the thickness of the second conductive layer is less than 1 μm; and / or, the thickness of the second hydrophobic anti-corrosion layer is less than 1 μm.

[0020] In a preferred embodiment, the total thickness of the vibration layer is less than 400 μm, the height of the remaining protruding portion of the microstructure is between 5 μm and 10 μm and the spacing between two adjacent microstructures is between 4 mm and 10 mm, and each microstructure is a single-point structure with a diameter between 50 μm and 2 mm or a multi-point structure with a total diameter of less than 2 mm, the thickness of the insulating layer is 6 μm to 8 μm, the thickness of the first hydrophobic anti-corrosion layer is less than 6 μm, and the distance between the first conductive layer and the second conductive layer is less than 30 μm.

[0021] In a preferred embodiment, the total thickness of the vibration layer is 125µm to 135µm, the height of the remaining protruding portion of the microstructure is 8µm and the spacing between two adjacent microstructures is 3.8mm, the thickness of the insulating layer is 6µm, and the thickness of the first hydrophobic anti-corrosion layer is 6µm; or, the total thickness of the vibration layer is 255µm to 265µm, the height of the remaining protruding portion of the microstructure is 6µm and the spacing between two adjacent microstructures is 5.8mm, the thickness of the insulating layer is 6µm, and the thickness of the first hydrophobic anti-corrosion layer is 6µm.

[0022] On the other hand, the present invention also discloses a manufacturing process for a directional sound-emitting touch display foldable screen, comprising:

[0023] S1, Preparing the vibration layer, including:

[0024] S11, Prepare the touch cover layer;

[0025] S12, preparing a display sound-emitting layer, including: forming a first conductive layer on the surface of the first substrate away from the client, and forming a display layer on the surface of the first substrate close to the client;

[0026] S13, the surface of the touch cover layer away from the client in S11 is attached to the surface of the display layer near the client in S12, and a first hydrophobic and anti-corrosion layer is formed on the surface of the first conductive layer away from the client.

[0027] S2, Prepare a non-vibration layer, the non-vibration layer comprising at least two independently spaced non-vibration regions, the preparation process of each non-vibration region comprising: forming an insulating layer on the surface of a conductive second substrate near the client, forming a substrate layer of the same material as the second substrate on the insulating layer, processing the substrate layer to form a microstructure, forming a second hydrophobic anti-corrosion layer on the surface of the insulating layer near the client and other than the microstructure, and binding an FPC signal line electrically connected to the second substrate in the non-AA region of the non-vibration region;

[0028] S3, the vibrating layer is attached to the non-AA area of ​​each non-vibrating area, the microstructure of each non-vibrating area near the upper end of the vibrating layer is embedded in the first hydrophobic anti-corrosion layer, each non-vibrating area and the corresponding vibrating layer form a sound-generating area, a DC bias voltage is applied between the first conductive layer and the second conductive layer in each sound-generating area, and the first hydrophobic anti-corrosion layer is cured.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. This invention provides a novel directional sound-emitting screen integrated under a touch display screen, forming a foldable directional sound-emitting touch display screen that combines a directional sound-emitting screen with a touch display screen. Through improvements to the structure, materials, processing technology, and distribution of the sound-emitting and non-vibrating layers of the vibrating layer, as well as innovative designs for the materials and processing technology of the microstructure, the directional sound-emitting touch display screen achieves multiple functions such as directional sound emission and touch display, while also realizing a foldable screen design and improving the overall operational reliability of the product.

[0031] 2. This invention innovatively combines multiple structural elements, such as setting the insulating layer on the non-vibration layer, using a conductive substrate for the non-vibration layer, and designing the non-vibration layer in a partitioned manner, to achieve a foldable screen while making the overall screen thin and light.

[0032] 3. The innovative feature of this invention is the addition of a hydrophobic and anti-corrosion layer to both the vibrating and non-vibrating layers. This layer not only fixes the microstructure to prevent Z-axis separation between the vibrating and non-vibrating layers, but also effectively achieves waterproofing and shock absorption, improving product reliability. Furthermore, the hydrophobic and anti-corrosion layer is made of low-density porous material, which effectively reduces the mass of the vibrating layer, thereby increasing its vibration efficiency. The porous material can also eliminate subtle noises caused by uneven vibration, effectively reducing total harmonic distortion.

[0033] 4. Compared with the existing touch layer set in the display screen structure, the present invention innovatively places the touch layer on the cover plate far away from the display screen. Without adding thickening material between the touch layer and the sound layer, it can also ensure a distance of more than 100um between the touch layer and the sound layer, thereby avoiding the generation of interference signals and improving the sound generation efficiency of the vibration layer.

[0034] 5. By adding a hydrophobic and anti-corrosion layer to both the vibrating and non-vibrating layers, the non-AA areas of the vibrating and non-vibrating layers do not require a fully sealed design, nor do they require hot-pressed waterproof adhesive or side-sealed waterproof adhesive. This avoids problems such as deformation of the vibrating layer, separation of the vibrating and non-vibrating layers, and reduced product reliability caused by the unbalanced internal and external air pressure difference due to the fully sealed design. Furthermore, it simplifies the overall processing technology of the product while ensuring product reliability.

[0035] 6. This invention innovatively uses ultra-thin glass UTG or unequal thickness flexible glass UFG as the substrate of the touch cover layer, and uses low-cost SUS steel plate or carbon fiber plate substrate as the substrate of the non-vibration layer. Furthermore, it uses laser or photolithography to process materials such as SUS steel plate or carbon fiber plate substrate to form microstructures. The resulting microstructures have high structural strength, preventing the product from deforming over a long period of time and improving reliability. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of a directional sound-emitting touch display folding screen (with the vibration layer and non-vibration layer not bonded) in one embodiment of the present invention;

[0037] Figure 2 This is a schematic diagram of the structure of a directional sound-emitting touch display folding screen (after the vibration layer and non-vibration layer are bonded together) in one embodiment of the present invention;

[0038] Figure 3 and Figure 4 These are schematic diagrams of the stacked structure of the microstructure in the non-vibration zone (without the second hydrophobic anti-corrosion layer) in an embodiment of the present invention before and after processing;

[0039] Figure 5 This is a schematic flowchart illustrating the manufacturing process of the directional sound-emitting touch display foldable screen of the present invention.

[0040] The attached figures are labeled as follows:

[0041] 1. Vibration layer; 11. Touch cover layer; 111. Third substrate; 112. Upper ITO layer; 113. Lower ITO layer; 12. Display sound layer; 121. Display layer; 1211. Polarizing layer; 1212. Encapsulation layer; 1213. Thin film transistor layer; 122. Sound layer; 1221. First substrate; 1222. First conductive layer; 1223. First hydrophobic anti-corrosion layer; 114. Optical layer; 115. Buffer layer; 2. Non-vibration area; 21. Second substrate; 22. Insulating layer; 23. Microstructure; 24. Second hydrophobic anti-corrosion layer; 25. Substrate layer; 3. Air gap; 4. FPC signal line; 5. Sound area; 6. Folded area. Detailed Implementation

[0042] 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.

[0043] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprising" shall be understood to include the stated elements or components without excluding other elements or other components.

[0044] Combination Figure 1 and Figure 2 As shown, the present invention discloses a directional sound-emitting touch display folding screen, including a vibrating layer 1 and a non-vibrating layer. The non-vibrating layer includes at least two independently spaced non-vibrating areas 2. The vibrating layer 1 and the non-AA area of ​​each non-vibrating area 2 are attached to form a plurality of sound-emitting areas 5. A folding area 6 is formed between two adjacent sound-emitting areas 5. An air gap 3 is formed between the vibrating layer 1 and each non-vibrating area 2 for the vibrating layer 1 to vibrate. Under the action of an externally loaded ultrasonic signal, the vibrating layer 1 of each sound-emitting area 5 reciprocates in the direction of approaching or moving away from the non-vibrating area 2, thereby directional sound emission and also having a touch display function.

[0045] Specifically, in this embodiment, the vibration layer 1 includes a touch cover layer 11 and a display sound-emitting layer 12. The display sound-emitting layer 12 specifically includes a display layer 121 and a sound-emitting layer 122, with the display layer 121 located between the touch cover layer 11 and the sound-emitting layer 122. In implementation, the touch cover layer 11 can be either a single-layer conductive layer touch scheme or a double-layer conductive layer touch scheme. Specifically, when the touch cover layer 11 is a single-layer conductive layer touch scheme, i.e., only a single-sided ITO conductive pattern design is used, the touch cover layer 11 specifically includes a third substrate 111 and an ITO layer with a conductive pattern, wherein the ITO layer is disposed on the surface of the third substrate 111 near or away from the client. Alternatively, when the touch cover layer is a dual-layer conductive touch solution, the touch cover layer specifically includes a third substrate 111, an upper ITO layer 112 and a lower ITO layer 113, both with conductive patterns. The upper ITO layer 112 and the lower ITO layer 113 are respectively disposed on the upper surface of the third substrate 111 near the client and the lower surface away from the client. Preferably, since the final screen needs to be foldable, the third substrate 111 of the present invention is made of ultra-thin glass (UTG) or unequal-thickness flexible glass (UFG), with a thickness generally below 100 μm. The lower the thickness, the smaller the R-angle of the screen folding.

[0046] In addition, the touch cover layer may also include an optical layer 114, which is located on the outermost layer (i.e., the outermost side closest to the client) and has a thickness generally less than 5µm, such as between 1µm and 5µm. In implementation, it can be a composite layer combining one or more of the following: anti-glare (AG), anti-reflection (AR), and anti-fingerprint (AF). Of course, this layer may or may not be included depending on actual needs. During processing, the optical layer 114 can be formed on the upper surface of the aforementioned upper ITO layer 112 using wet and dry processes. Preferably, to prevent the third substrate 111 from easily cracking, a buffer layer 115 can be added on the optical layer. The thickness of the buffer layer 115 can be designed according to the anti-splash function of different scenarios; the thicker the layer, the better the anti-splash effect. In one embodiment, the thickness of the buffer layer 115 is set to 10µm to 20µm.

[0047] The display layer 121 specifically includes a polarizing layer (POL) 1211 with pressure-sensitive adhesive (PSA), an encapsulation layer (TFE) 1212, and a thin-film transistor layer (TFT) 1213. The polarizing layer 1211 is disposed between the touch cover layer 11 and the encapsulation layer 1212. In this embodiment, it is specifically a polarizing layer with pressure-sensitive adhesive on both sides. Ideally, its thickness should be as low as possible, generally less than 80 μm; currently, a minimum thickness of 60 μm with adhesive on both sides is achievable. The thin-film transistor layer 1213 is disposed between the encapsulation layer 1212 and the sound-emitting layer 122. In practice, the thickness of the encapsulation layer 1212 is generally less than or equal to 15 μm, and the thickness of the thin film transistor layer 1213 is generally less than or equal to 10 μm. Both the encapsulation layer 1212 and the thin film transistor layer 1213 are formed by low-temperature (e.g., 100°C to 300°C) chemical vapor deposition (CVD) or physical vapor deposition (PVD) on the first substrate described below. Both can be implemented using existing mature encapsulation layers and thin film transistor layers, which will not be elaborated here.

[0048] Preferably, the sound-emitting layer 122 specifically includes a first substrate 1221, a first conductive layer 1222, and a first hydrophobic anti-corrosion layer 1223, wherein the first substrate 1221 is disposed on the surface of the display layer 121 (specifically, the thin film transistor layer 1213 of the display layer) 121 away from the client, the first conductive layer 1222 is disposed on the surface of the first substrate 1221 away from the display layer 121, and the first hydrophobic anti-corrosion layer 1223 is disposed on the surface of the first conductive layer 1222 away from the first substrate 1221. In practice, the lower the thickness of the first substrate 1221, the better it is to improve the vibration and sound generation efficiency. It is generally set to 15um~25um, preferably 15um, and the material can be polyimide (PI). Of course, glass can also be used, which has the advantages of low process difficulty and a thickness of generally higher than 300um. If the first substrate 1221 is glass, the thickness of the third substrate 111 needs to be reduced. The third substrate 111 is preferably made of 100um ultrathin flexible glass UTG, so as to ensure that the overall thickness of the vibration layer 1 is below 400um.

[0049] The thickness of the first conductive layer 1222 is preferably less than 1 μm, and the material is preferably a copper alloy or a silicon steel alloy. A lower sheet resistance results in a higher load power on the sound-generating screen, preferably in the milliohm range, and a low dielectric loss, which can be below 10Ω. Compared with existing ITO materials, copper alloys or silicon steel alloys have the characteristics of high strength, corrosion resistance, and heat resistance, which are beneficial to improving the overall reliability of the vibrating layer. Of course, the material of the first conductive layer 1222 can also be preferably conductive materials such as carbon nanotubes or graphene.

[0050] It should be noted that in existing solutions, the touch layer is disposed on the display layer 121 (specifically, on the thin-film transistor layer TFT). In this solution, signal interference occurs when the distance between the touch layer and the first conductive layer 1222 of the sound-emitting layer 122 is less than 100µm. To maintain the touch functionality of the display layer 121 without signal interference, existing solutions require the addition of a thickened material and grounding between the surface of the thin-film transistor layer 1213 away from the client and the first conductive layer 1222. However, this thickened material increases the weight of the vibrating layer, thus affecting its sound generation efficiency. Preferably, this invention creatively integrates the touch layer from the display layer 121 onto the third substrate 111. This ensures a distance greater than 100µm between the touch layer and the sound-emitting layer 122 without adding a thickened material, thereby avoiding interference signals and improving the sound generation efficiency of the vibrating layer.

[0051] Preferably, the present invention adds the aforementioned first hydrophobic and anti-corrosion layer 1223 to the sound-generating layer 122. In practice, the first hydrophobic and anti-corrosion layer 1223 is preferably a porous aerogel layer. This is because the porous aerogel layer has a low elastic modulus in the horizontal direction (i.e., the XY direction), ensuring that the vibrating layer 1 and the non-vibrating region 2 will not shift horizontally in harsh environments after being bonded together. This prevents the non-vibrating region 2 (especially the microstructure 23 of the non-vibrating region 2) from separating from the vibrating layer 1 in the Z direction, while also ensuring matching of the coefficient of thermal expansion (CTE) in the XY direction. Furthermore, due to the porous nature of the aerogel material, the waterproof and shock-absorbing function of the first hydrophobic and anti-corrosion layer 1223 can be effectively achieved by adjusting the porosity. To a certain extent, this ensures that the first conductive layer 1222 and the second conductive layer described below are not corroded by moisture, improving device reliability. Moreover, the porous structure can eliminate subtle noises caused by uneven vibration, effectively reducing total harmonic distortion (THD) to a certain extent. The density of the aerogel material can be as low as 22 mg / cm³. 3 Its density is 0.012 times that of the lightest carbon fiber backplate for foldable screens. The low density can effectively reduce the mass of the vibration layer and effectively increase the vibration efficiency.

[0052] Furthermore, during implementation, the porous aerogel layer is preferably formed at least twice during processing. Except for the final forming process, which is non-adhesive, the remaining forming processes are adhesive to fix the embedded microstructure. During processing, each forming process of the porous aerogel layer can employ UV curing, thermosetting, or 3D printing. The temperatures for both UV curing and thermosetting are below 100°C to prevent the display layer from malfunctioning due to excessive temperature. In other alternative embodiments, the porous aerogel layer can also be processed using a low-asset, solvent-free 3D printing device to prevent polarization failure and expansion / contraction caused by contact with acidic or alkaline water. In this embodiment, the porous aerogel layer specifically employs a two-step forming process. In the first forming process, the porous aerogel layer has high adhesiveness, allowing it to bond with the microstructure. After the second forming, the surface of the porous aerogel layer is non-adhesive, ensuring that it will not bond with the second hydrophobic anti-corrosion layer under certain conditions due to contact and will not spring back.

[0053] Unlike existing non-vibrational layers where the folding area is not through-hole, this invention divides the non-vibrational layer into multiple independent non-vibrational regions 2 to facilitate foldable screens. Each non-vibrational region 2 specifically includes a second substrate 21, an insulating layer 22, a microstructure 23, and a second hydrophobic anti-corrosion layer 24. In practice, the second substrate 21 is preferably made of SUS steel plate with a thickness of 20µm to 50µm or more, or carbon fiber plate with a thickness of more than 100µm and a conductive surface. When the thickness of the second substrate 21 is 100µm, the folding radius (R-angle) can be as low as 1mm to 2mm; when the thickness is 300µm, the folding radius (R-angle) is greater than 5mm.

[0054] Preferably, the insulating layer 22 is disposed in the non-vibration layer, specifically on the end face of the second substrate 21 near the vibration layer 1, rather than on the vibration layer 1. This reduces the thickness of the vibration layer 1, further decreasing the bending radius (R-angle) of the screen and making the final screen folding more flexible. In practice, the insulating layer 22 is preferably an organic-inorganic composite material with fast heat dissipation, low loss, and a dielectric constant between 2 and 6 at 1MHz. A certain proportion of boron nitride micro / nano particles can be doped into the organic-inorganic composite material. The thickness of the insulating layer 22 is related to its material insulation properties. Generally, under driving voltage conditions of 300V~500V DC and 150V~200V AC, a material thickness of 6µm or more for the insulating layer 22 can ensure that the device does not break down.

[0055] In addition, combined Figure 3 and Figure 4As shown, unlike existing methods that add microstructures 23 to the second substrate 21 (i.e., additive processing), the microstructure 23 of this invention is preferably integrally formed from a substrate layer 25 located on the insulating layer 22 and made of the same material as the second substrate 21 (i.e., subtractive processing). Specifically, the substrate layer 25 is first formed on the end face of the insulating layer 22 near the vibration layer 1. Then, the surface of the substrate layer 25 near the vibration layer 1 is processed using laser and photolithography to form the microstructure 23. The pattern of the microstructure 23 is a plurality of bumps arranged in an array. That is, the material of the microstructure 23 is the same as that of the second substrate 21, preferably SUS steel plate or carbon fiber plate. The Young's modulus of SUS steel plate is more than 10 times that of microstructures formed by traditional photoresist ink, printing ink, or printing ink. Its structural strength in the Z direction is much higher than that of traditional microstructures, thus ensuring that the final product does not deform over a long period, improving reliability. In this embodiment, the microstructure 23 is formed using laser and photolithography processes, and the accuracy of the microstructure 23 in the Z direction can reach ±1.5 μm. Each microstructure 23 (i.e., each bump) can be directly designed as a single-point structure with a diameter between 50 μm and 2 mm, or it can be designed as a multi-point structure with a total diameter of less than 2 mm. It should be noted that the insulating layer 22 in this invention serves both as insulation and as a means to laser-weld the substrate layer 25 and the second substrate 21 together. By performing laser through-hole lithography on the substrate layer 25, the second substrate 21, protected by the insulating layer 22, cannot be damaged by the laser. The material of the insulating layer 22 is indifferent to the laser wavelength; only the substrate layer 25 is lithographically patterned with the specifically designed microstructure 23.

[0056] Furthermore, since the second substrate 21 of the present invention is made of self-conductive SUS steel plate or surface-conductive carbon fiber plate, a conductive layer may not be provided in the non-vibration layer.

[0057] Preferably, the present invention also adds a hydrophobic anti-corrosion layer on the non-vibration zone 2, namely the second hydrophobic anti-corrosion layer 24. The second hydrophobic anti-corrosion layer 24 is disposed on the surface of the insulating layer 22 excluding the microstructure 23. In practice, the lower the thickness of the second hydrophobic anti-corrosion layer 24, the better it is to improve the sound generation efficiency of the device, preferably less than 1 μm. Its material can be the same as or different from the first hydrophobic anti-corrosion layer. Common waterproof materials are suitable for the present invention, and preferably can be processed by vapor deposition, 3D printing or magnetron sputtering. Moreover, the water droplet angle of the second hydrophobic anti-corrosion layer 24 is preferably greater than 105° to prevent the first hydrophobic anti-corrosion layer 1223 and the second hydrophobic anti-corrosion layer 24 from coming into contact without rebounding.

[0058] The microstructure 23 protrudes from the surface of the second hydrophobic anti-corrosion layer 24, and its upper part near the vibration layer 1 is embedded and fixed in the first hydrophobic anti-corrosion layer 1223. The remaining protruding part forms an air gap 3 between the vibration layer 1 and the non-vibration area 2.

[0059] Furthermore, preferably, because the present invention adds a hydrophobic anti-corrosion layer to both the vibration layer 1 and the non-vibration area 2, and improves the placement of the touch cover layer 11 and the material and process of the microstructure 23 by using ultra-thin UTG glass, unequal thickness flexible UFG glass, SUS steel plate, or carbon fiber plate for each substrate, the non-AA area of ​​the vibration layer 1 and the non-AA area of ​​the non-vibration area 2 does not require a fully sealed design or a hot-pressed waterproof adhesive and side-sealed waterproof adhesive design. Preferably, the non-AA areas of the vibration layer 1 and the non-vibration area 2 are bonded together and have at least one vent hole (not shown). In a specific embodiment, the non-AA areas of the vibration layer 1 and the non-vibration area 2 are bonded together using multiple double-sided adhesives, each with a width of 1mm to 4mm and a thickness of less than 30um. This design can avoid the problems caused by the inability to balance the internal and external air pressure difference due to a fully sealed design, which leads to deformation of the vibration layer, separation of the vibration layer and the non-vibration area, and reduced product reliability. It also simplifies the overall processing technology of the product while ensuring product reliability.

[0060] During implementation, the total thickness of the vibration layer 1 is less than 400um, the height of the remaining protruding part of the microstructure is between 5um and 10um, the spacing between two adjacent microstructures is between 4mm and 10mm, and each microstructure is a single-point structure with a diameter between 50um and 2mm or a multi-point structure with a total diameter of less than 2mm. The thickness of the insulation layer is 6um to 8um, the thickness of the first hydrophobic anti-corrosion layer is less than 6um, and a screen of 10 inches or larger can achieve a sound pressure level of 76dB at 1kHz.

[0061] In specific embodiments, the total thickness of the vibrating layer 1 is 125µm to 135µm, specifically 130±5µm; the height of the remaining protruding portion of the microstructure 23 is 8µm and the spacing between two adjacent microstructures 23 is 3.8mm; the thickness of the insulating layer 22 is 6µm; and the thickness of the first hydrophobic anti-corrosion layer 1223 is 6µm. Alternatively, the total thickness of the vibrating layer 1 is 255µm to 265µm, specifically 260±5µm; the height of the remaining protruding portion of the microstructure 23 is 6µm and the spacing between two adjacent microstructures 23 is 5.8mm; the thickness of the insulating layer 22 is 6µm; and the thickness of the first hydrophobic anti-corrosion layer 1223 is 6µm. In both embodiments, for a screen with a conventional aspect ratio of 12.3 inches, both embodiments can achieve a sound pressure level of 73dB at 1kHz, a total harmonic distortion (THD) of less than 5%, and a load power of less than 5W.

[0062] like Figure 5As shown, the specific manufacturing process of the directional sound-emitting touch display foldable screen of the present invention is as follows:

[0063] S1, Preparing vibration layer 1, including:

[0064] S11, Prepare the touch cover layer 11;

[0065] S11 includes: thinning the third substrate 111 and depositing an ITO layer on its surface near and / or away from the client, and patterning the ITO layer.

[0066] In one specific embodiment, an ultra-thin glass UTG with a thickness of 100µm to 300µm is first thinned, edge-ground, and strengthened. Then, ITO is magnetron sputtered on its surfaces near and away from the client to form an upper ITO layer 112 and a lower ITO layer 113, respectively. The upper ITO layer 112 and the lower ITO layer 113 are then patterned by exposure, development, and etching under yellow light. After that, a metal coating is deposited on the patterned upper ITO layer 112 and the lower ITO layer 113, and the metal coating is then patterned by exposure, development, and etching under yellow light to form a touch cover layer 11 with touch functionality. Preferably, the upper ITO layer 112 near the client can also be treated with 3A (i.e., anti-glare, anti-reflection, and anti-fingerprint) processes using wet and dry methods. In other embodiments, the conductive layer on the surface of the third substrate 111 can also be a 3D-printed transparent carbon nanotube layer, followed by laser etching of a pattern on the transparent carbon nanotube layer, and then a 3D-printed metal pattern wiring layer on the surface of the patterned transparent carbon nanotube layer. Finally, a 3A (anti-glare, anti-reflection, and anti-fingerprint layer) treatment is performed on the end face of the transparent carbon nanotube layer near the client using a 3D printing process. The principles and processes of patterning the ITO layer or transparent carbon nanotube layer and the metal coating, and the 3A treatment, can refer to the existing touch layer processing technology and will not be elaborated here. Preferably, to prevent the ultrathin glass UTG from breaking, it is also preferable to add another buffer layer 115 on the optical layer 114.

[0067] S12, fabricating the display sound-emitting layer 12 includes: forming a first conductive layer 1222 on the surface of the first substrate 1221 away from the client, and forming a display layer 121 on the surface of the first substrate 1221 close to the client;

[0068] The fabrication process of the display layer 121 specifically includes: forming a thin film transistor layer 1213 with circuitry on the surface of the first substrate 1221 near the client; forming an encapsulation layer 1212 on the surface of the thin film transistor layer 1213 near the client; and bonding the surface of the encapsulation layer 1212 near the client to a polarizer layer 1211 with pressure-sensitive adhesive.

[0069] In one specific embodiment, a first conductive layer 1222 is formed on the surface of the first substrate 1221 away from the client by vapor deposition, 3D printing or magnetron sputtering. An insulating layer 22 is formed on the surface of the first conductive layer 1222 away from the first substrate 1221 by 3D printing, vapor deposition or slot coating. A thin film transistor layer 1213 with circuitry is formed on the surface of the first substrate 1221 near the client by exposure, development and etching under yellow light. A multilayer encapsulation layer 1212 is deposited at low temperature on the surface of the thin film transistor layer 1213 near the client. Finally, the surface of the encapsulation layer 1212 near the client is bonded to a polarizer layer 1211 with pressure-sensitive adhesive.

[0070] S13, the surface of the touch cover layer 11 away from the client is attached to the surface of the polarizer layer 1211 of the display sound layer 12 near the client, and a first hydrophobic anti-corrosion layer 1223 is formed on the surface of the first conductive layer 1222 away from the client.

[0071] In one specific embodiment, the lower ITO layer 113 of the touch cover plate layer 11 is bonded to the surface of the polarizer layer 1211 near the client. After bonding, a degassing treatment is performed. Finally, a porous aerogel layer is formed on the surface of the first conductive layer 1222 away from the client through 3D printing, vapor deposition, or slot coating. The porous aerogel layer is cured twice. In the first curing process, UV curing is used, and the curing energy is controlled within 4000mJ to prevent multilayer shrinkage and yellowing due to heat.

[0072] S2, prepare a non-vibration layer, the non-vibration layer comprising at least two independently spaced non-vibration regions 2, the preparation process of each non-vibration region 2 comprising: forming an insulating layer 22 on the surface of a conductive second substrate 21 near the client, forming a substrate layer 25 of the same material as the second substrate 21 on the insulating layer 22, processing the substrate layer 25 to form a microstructure 23, forming a second hydrophobic anti-corrosion layer 24 on the surface of the insulating layer 22 near the client and other than the microstructure 23, and binding an FPC signal line 4 electrically connected to the second conductive layer 23 in the non-AA region of the non-vibration region 2.

[0073] In one specific implementation, an insulating layer 22 is preferably formed on the surface of the second substrate 21 near the client by vapor deposition, 3D printing, or slot coating. The surface of the insulating layer 22 near the client is then welded to the substrate layer 25. Microstructures 23 are then laser-etched on the surface of the substrate layer 25 near the client. Finally, a second hydrophobic and anti-corrosion layer 24 is formed on the surface of the insulating layer 22 near the client by vapor deposition or 3D printing. An FPC (flexible printed circuit board) signal line 5 electrically connected to the second substrate 21 is then bound in the non-AA area of ​​the non-vibration zone 2.

[0074] The non-vibration layer is divided into at least two independently spaced non-vibration regions 2. In practice, the entire functional layer of the non-sound-generating region 2 of the fabricated non-vibration layer can be etched away, or each non-vibration region 2 can be independently prepared during processing. Each non-vibration region 2 includes the second substrate 21, insulating layer 22, microstructure 23 and second hydrophobic anti-corrosion layer 24, and the preparation process is the same as the preparation steps of S2.

[0075] S3, the vibrating layer 1 is attached to the non-AA area of ​​each non-vibrating area 2, and the microstructure 23 of each non-vibrating area 2 is embedded in the upper part of the vibrating layer 1 near the vibrating layer 1. Each non-vibrating area and the corresponding vibrating layer form a sound-generating area 5. A DC bias voltage is applied between the first conductive layer 1222 and the second conductive layer 23 of each sound-generating area 5, and the first hydrophobic anti-corrosion layer 1223 is cured.

[0076] In one specific embodiment, the vibrating layer 1 is bonded to the non-AA region of the non-vibrating region 2. The upper portion of the microstructure 23 near the vibrating layer 1 is embedded in the first hydrophobic anti-corrosion layer 1223. A DC bias voltage of 200V~400V is applied between the first conductive layer 1222 and the second conductive layer 23, and the first hydrophobic anti-corrosion layer 1223 is UV-cured or thermally cured. Finally, the finished product is subjected to acoustic, electrical, and aging tests.

[0077] In addition, the design of the structure, materials and processing technology of each layer can be referred to the description in the above description of the directional sound-emitting touch display foldable screen, and will not be repeated here.

[0078] The advantages of this invention are as follows: 1. This invention provides a novel directional sound-emitting screen integrated under a touch display screen, forming a foldable directional sound-emitting touch display screen that combines a directional sound-emitting screen with a touch display screen. By improving the structure, materials, processing technology, and distribution position of the sound-emitting and non-vibrating layers of the vibrating layer, as well as the innovative design of the microstructure materials and processing technology, the directional sound-emitting touch display screen achieves multiple functions such as directional sound emission and touch display, while also realizing a foldable screen design and improving the overall reliability of the product. 2. This invention innovatively combines multiple structural elements, such as placing the insulating layer on the non-vibrating layer, using a conductive substrate for the non-vibrating layer, and implementing a partitioned design for the non-vibrating layer, to achieve a foldable screen while maintaining an overall thin and light design. 3. This invention innovatively adds a hydrophobic and anti-corrosion layer to both the vibrating and non-vibrating layers. This not only fixes the microstructure, preventing Z-axis separation between the vibrating and non-vibrating layers, but also effectively achieves waterproofing and shock absorption, improving product reliability. Furthermore, the hydrophobic and anti-corrosion layer uses a low-density porous material, which effectively reduces the mass of the vibrating layer, thereby increasing its vibration efficiency. The porous material also eliminates subtle noises caused by uneven vibration, effectively reducing total harmonic distortion. 4. Compared to existing touch layers located within the display screen structure, this invention innovatively places the touch layer on the cover plate, away from the display screen. Without adding thicker material between the touch layer and the sound-emitting layer, it maintains a distance greater than 100µm between them, thus avoiding interference signals and improving the sound-emitting efficiency of the vibrating layer. 5. This invention adds a hydrophobic anti-corrosion layer to both the vibrating and non-vibrating layers, eliminating the need for a fully sealed design in the non-AA areas of both layers, as well as the need for hot-pressed waterproof adhesive and side-sealed waterproof adhesive. This avoids problems such as unbalanced internal and external air pressure caused by a fully sealed design, leading to deformation of the vibrating layer, separation of the vibrating and non-vibrating layers, and reduced product reliability. Furthermore, it simplifies the overall product manufacturing process while ensuring product reliability. 6. This invention innovatively uses ultra-thin UTG glass or unequal-thickness flexible UFG glass as the substrate for the touch cover layer, and uses low-cost and readily mass-producible SUS steel plate or carbon fiber plate substrates for the non-vibrating layer. The microstructures formed by laser or photolithography on these materials result in high-strength microstructures that prevent deformation over long periods, thus improving product reliability.

[0079] 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 directional sound emitting touch display folding screen, characterized in that, The application relates to a directional sound emitting touch display folding screen. The vibration layer comprises a touch cover plate layer and a display sound emitting layer, the display sound emitting layer comprises a display layer and a sound emitting layer, the display layer is located between the touch cover plate layer and the sound emitting layer, the sound emitting layer comprises a first substrate, a first conductive layer and a first hydrophobic corrosion resistant layer, the first substrate is arranged on the surface of the display layer away from the client, the first conductive layer is arranged on the surface of the first substrate away from the display layer, and the first hydrophobic corrosion resistant layer is arranged on the surface of the first conductive layer away from the first substrate. The non-vibration layer comprises at least two independent and spaced non-vibration areas, each of the non-vibration areas comprises a conductive second substrate, an insulating layer, a microstructure and a second hydrophobic corrosion resistant layer, the insulating layer is arranged on the surface of the second substrate close to the vibration layer, the microstructure is formed on the insulating layer and is integrally formed by a substrate layer of the same material as the second substrate on the insulating layer, and is a plurality of convex points arranged in an array, the second hydrophobic corrosion resistant layer is arranged on the surface of the insulating layer except the microstructure, the microstructure protrudes from the surface of the second hydrophobic corrosion resistant layer, and the upper end part close to the vibration layer is embedded and fixed in the first hydrophobic corrosion resistant layer, and the remaining protruding part forms an air gap between the vibration layer and the non-vibration layer. The vibration layer vibrates up and down under the action of an externally applied driving voltage to perform directional sound emission. 2.The directional sound emitting touch display folding screen of claim 1, wherein, The first hydrophobic anticorrosion layer is a porous aerogel layer, and / or the density of the porous aerogel layer is at least 22 mg / cm 3 , and / or the porous aerogel layer is shaped at least twice, and is non-sticky in the last shaping process, and is sticky in the remaining shaping processes to fix the embedded microstructure; and / or each shaping process of the porous aerogel layer is UV curing shaping or thermal curing shaping or 3D printing shaping, and the temperature of the UV curing shaping and the thermal curing shaping is lower than 100°. Alternatively, the first hydrophobic corrosion resistant layer comprises a thermoplastic polyurethane rubber layer and a waterproof layer, the thermoplastic polyurethane rubber layer is arranged on the surface of the insulating layer away from the first conductive layer, and the waterproof layer is arranged on the surface of the thermoplastic polyurethane rubber layer away from the insulating layer. 3.The directional sound emitting touch display folding screen of claim 1, wherein, The microstructure is formed by laser and photoetching processes on the surface of the substrate layer on the insulating layer close to the vibration layer; and / or the second substrate is a SUS steel plate with a thickness of 20-50 um or 100 um or above or a carbon fiber plate with a thickness of 100 um or above and a conductive surface; and / or the third substrate is an ultra-thin glass (UTG) with a thickness of 100 um or below or an unequal-thickness flexible glass (UFG).

4. The directional sound emitting touch display folding screen according to claim 1, wherein the touch cover plate layer comprises a third substrate and an ITO layer with a conductive pattern, and the ITO layer is arranged on the surface of the third substrate close to or away from the client. Alternatively, the touch cover plate layer comprises a third substrate, an upper ITO layer and a lower ITO layer both with a conductive pattern, and the upper ITO layer and the lower ITO layer are arranged on the upper surface of the third substrate close to the client and on the lower surface of the third substrate away from the client respectively. ​ 5.The directional sound emitting touch display folding screen of claim 1, wherein, The non-AA area of the vibration layer and the non-vibration layer is attached and provided with at least one air hole; and / or, the square resistance of the first conductive layer is lower than 10 Ω, and the thickness is nanometer level; and / or, the insulating layer adopts an organic-inorganic composite material with a dielectric constant between 2 and 6 at 1 MHz, and the organic-inorganic composite material is doped with boron nitride micro-nano particles; and / or, the first conductive layer and the second conductive layer are steel alloy conductive layers, silicon steel alloy conductive layers, carbon nanotube conductive layers or graphene conductive layers. 6.The directional sound emitting touch display folding screen of claim 1, wherein, The display layer comprises a polarizer layer with pressure-sensitive adhesive, an encapsulation layer and a thin film transistor layer, the polarizer layer is arranged between the touch cover layer and the encapsulation layer, and the thin film transistor layer is arranged between the encapsulation layer and the sound emitting layer. 7.The directional sound emitting touch display folding screen of claim 6, wherein, The encapsulation layer and the thin film transistor layer are formed by low-temperature chemical or physical vapor deposition on the first substrate. 8.The directional sound emitting touch display folding screen of claim 1, wherein, The touch cover layer further comprises an optical layer or further comprises an optical layer and a buffer layer, the thickness of the optical layer is less than 5 um, and the optical layer is one or a composite layer of more than two of anti-glare, anti-reflection and anti-fingerprint; and / or, the thickness of the second conductive layer is less than 1 um; and / or, the thickness of the second hydrophobic corrosion-resistant layer is less than 1 um. 9.The directional sound emitting touch display folding screen according to any one of claims 1-8, wherein, The total thickness of the vibration layer is less than 400 um, the height of the remaining protruding part of the microstructure is between 5 um and 10 um, the distance between adjacent two microstructures is between 4 mm and 10 mm, each microstructure is a single point structure with a diameter of between 50 um and 2 mm or a multi-point structure with a total diameter of less than 2 mm, the thickness of the insulating layer is between 6 um and 8 um, the thickness of the first hydrophobic corrosion-resistant layer is less than 6 um, and the distance between the first conductive layer and the second conductive layer is less than 30 um. 10.A preparation process of a directional sound emitting touch display folding screen, characterized in that, The process comprises: S1, preparing a vibration layer, comprising: S11, preparing a touch cover layer; S12, preparing a display and sound emitting layer, comprising: forming a first conductive layer on the surface of the first substrate away from the client, and forming a display layer on the surface of the first substrate close to the client; S13, attaching the surface of the touch cover layer in S11 away from the client to the surface of the display layer in S12 close to the client, and forming a first hydrophobic corrosion-resistant layer on the surface of the first conductive layer away from the client; S2, preparing a non-vibration layer, the non-vibration layer comprising at least two independent and spaced non-vibration areas, and the preparation process of each non-vibration area comprising: forming an insulating layer on the surface of the conductive second substrate close to the client, forming a substrate layer with the same material as the second substrate on the insulating layer, processing the substrate layer to form a microstructure, forming a second hydrophobic corrosion-resistant layer on the surface of the insulating layer close to the client and excluding the microstructure, and binding an FPC signal line electrically connected to the second substrate in the non-AA area of the non-vibration area; S3, the vibration layer is attached to the non-AA area of each non-vibration area, the microstructure of each non-vibration area is embedded in the first hydrophobic corrosion prevention layer near the upper end portion of the vibration layer, each non-vibration area and the corresponding vibration layer form a sound area, a direct current bias voltage is passed between the first conductive layer and the second conductive layer of each sound area, and the first hydrophobic corrosion prevention layer is cured.

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