Sound-producing film layer and electronic paper display device

Abstract

The utility model provides a kind of sound-emitting membrane layer and electronic paper display device.The utility model provides sound-emitting membrane layer, annular electrode is formed at each air hole of protective film by the first electrode layer being arranged between protective film and piezoelectric film, and alternating voltage is applied at annular electrode, piezoelectric effect is formed, so that the convex structure formed at each air hole corresponding position of piezoelectric film will produce radial telescopic deformation due to piezoelectric effect, to realize sound emission.At the same time, an electronic paper display device is also provided, which is provided with a sound-emitting membrane layer to realize sound emission, solving the technical problem that existing electronic paper cannot directly emit sound in the prior art, without the need for additional independent sound-emitting equipment, the sound-emitting membrane layer is directly added in the electronic paper display device to achieve the technical effect of independent sound emission of the electronic paper display device.

Description

Technical Field

[0001] This utility model relates to the field of electronic paper display technology, and in particular to a sound-emitting film layer and an electronic paper display device. Background Technology

[0002] Electronic paper, as a novel display technology, boasts low power consumption and a paper-like display effect. Current electronic paper modules primarily focus on display functions, exhibiting significant shortcomings in audio interaction. In many scenarios, users require electronic paper devices to have sound capabilities for audio playback, voice prompts, and other purposes to meet diverse information acquisition needs. However, the traditional electronic paper structure struggles to directly generate sound. Adding a separate sound-generating device would increase product size and cost, resulting in low integration and impacting portability and user experience. Therefore, developing a technical solution that organically integrates sound generation with electronic paper is of significant display importance. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a sound-emitting diaphragm and an electronic paper display device, which solves the technical problem that existing electronic paper cannot directly emit sound.

[0004] According to an embodiment of the present invention,

[0005] A sound-generating diaphragm layer, comprising a protective film, a piezoelectric thin film, and a substrate, characterized in that: the protective film is a transparent film including at least one through-hole; the piezoelectric thin film is disposed between the protective film and the substrate, having a protrusion structure corresponding to the vent hole, the protrusion structure forming a gap with the substrate; a first electrode layer is disposed between the protective film and the piezoelectric thin film, and a second electrode layer is disposed between the substrate and the piezoelectric thin film, the first electrode layer and the second electrode layer driving the protrusion structure to deform to generate sound.

[0006] In some embodiments, the protruding structure is a dome structure formed by vacuum suction at the position corresponding to the vent hole when the piezoelectric film is attached to the protective film, and the diameter of the vent hole is in the range of 1.5mm to 3.5mm.

[0007] In some embodiments, the piezoelectric film is at least one of polyvinylidene fluoride film, lead zirconium titanate film, or transparent zinc oxide film, and both the protective film and the substrate have a light transmittance greater than 90% and a bending radius of 2mm-3mm.

[0008] An electronic paper display device includes: a sound-emitting diaphragm layer, including the sound-emitting diaphragm layer as described in any of the above embodiments; an electronic paper ink layer having a display side and a non-display side; a substrate layer, wherein both the electronic paper ink layer and the sound-emitting diaphragm layer are connected to the substrate layer; and a driving chip connected to the substrate layer to control the display of the electronic paper ink layer and the sound-emitting diaphragm layer to emit sound; the electronic paper ink layer is disposed between the sound-emitting diaphragm layer and the substrate layer, with the sound-emitting diaphragm layer disposed near the display side of the electronic paper ink layer and the substrate layer disposed near the non-display side of the electronic paper ink layer.

[0009] In some embodiments, the electronic paper display device further includes: the electronic paper ink layer includes a third electrode layer; the substrate layer includes a fourth electrode layer; the driving chip is connected to the fourth electrode layer by an anisotropic conductive adhesive film; the first electrode layer is connected to the fourth electrode layer by a first silver paste, the second electrode layer is connected to the fourth electrode layer by a second silver paste, and the third electrode layer is connected to the fourth electrode layer by a third silver paste.

[0010] In some embodiments, the electronic paper display device further includes: a waterproof protective film layer disposed between the sound-emitting film layer and the electronic paper ink layer; a first through-hole penetrating the piezoelectric film, the substrate, the waterproof protective film layer, and the electronic paper ink layer is provided between the first electrode layer and the fourth electrode layer; a second through-hole penetrating the substrate, the waterproof protective film layer, and the electronic paper ink layer is provided between the second electrode layer and the fourth electrode layer; and a third through-hole penetrating between the third electrode layer and the fourth electrode layer; wherein the silver paste disposed in the first through-hole is the first silver paste, the silver paste disposed in the second through-hole is the second silver paste, and the silver paste disposed in the third through-hole is the third silver paste.

[0011] In some embodiments, the electronic paper display device further includes a flexible circuit board; wherein the flexible circuit board is connected to the fourth electrode layer via an anisotropic conductive adhesive film.

[0012] In some embodiments, the first silver paste and the second silver paste are disposed on the same side of the driver chip, and the third silver paste is disposed on the other side of the driver chip.

[0013] In some embodiments, the electronic paper display device further includes: a waterproof protective film layer disposed between the sound-emitting film layer and the electronic paper ink layer, wherein the projected area of ​​the sound-emitting film layer on the substrate layer is less than or equal to the projected area of ​​the waterproof protective film layer on the substrate layer.

[0014] In some embodiments, the difference between the width and / or height of the projection of the waterproof protective film layer onto the substrate layer and the width and / or height of the projection of the sound-emitting film layer onto the substrate layer is greater than or equal to 2 mm.

[0015] The technical principle of this invention is as follows: The sound-emitting membrane layer utilizes a protective film with through-holes for ventilation, and a piezoelectric thin film with raised structures corresponding to the ventilation holes. A first electrode layer is positioned between the protective film and the piezoelectric thin film, and a second electrode layer is positioned between the substrate and the piezoelectric thin film. Sound is generated by driving the raised structures to deform through the first and second electrode layers. Electronic paper display devices also utilize this internally incorporated sound-emitting membrane layer to achieve sound generation.

[0016] Compared to existing technologies, this invention offers the following advantages: It provides a sound-emitting diaphragm layer by creating a through-hole in the protective film and using a piezoelectric thin film to create raised structures at the corresponding locations of the holes. A first electrode layer is positioned between the protective film and the piezoelectric thin film, and a second electrode layer is positioned between the substrate and the piezoelectric thin film. Sound is generated by driving the raised structures to deform through the first and second electrode layers. Furthermore, this invention also provides an electronic paper display device with a sound-emitting diaphragm layer, thus achieving sound generation. This solves the problem of existing electronic paper displays being unable to directly generate sound, eliminating the need for an additional independent sound-generating device. The sound-emitting diaphragm layer is directly integrated into the electronic paper display device, enabling independent sound generation. Moreover, since the sound-emitting diaphragm layer is integrated directly into the device, it avoids the need for an additional independent sound-generating device, which would make the device too bulky. This ensures both the device's ability to generate sound and its portability, thereby improving the user experience. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a sound-emitting membrane layer according to an embodiment of the present invention.

[0018] Figure 2 This is a side view of an electronic paper display device according to an embodiment of the present invention.

[0019] Figure 3 for Figure 2 A view of the substrate layer orientation of an electronic paper display device.

[0020] Figure 4 This is a side view of an electronic paper display device according to another embodiment.

[0021] Figure 5 for Figure 4 A view of the substrate layer orientation of an electronic paper display device.

[0022] In the above figures: 1. Sound-emitting membrane layer; 11. Protective film; 12. Piezoelectric film; 13. Substrate; 14. First electrode layer; 15. Second electrode layer; 2. Waterproof protective film layer; 3. Electronic paper ink layer; 31. Self-contained transparent optical adhesive; 32. Third electrode layer; 33. Electronic paper ink film; 34. Insulating adhesive; 4. Substrate layer; 41. Driver chip; 42. Fourth electrode layer; 5. Transparent optical adhesive; 6. Anisotropic conductive adhesive film; 7. Edge sealing adhesive; 8. Flexible circuit board; A-First through hole; B-Second through hole; C-Third through hole; D-Ventilation hole; E-Protruding structure. Detailed Implementation

[0023] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 As shown in the figure, this utility model embodiment proposes a sound-emitting diaphragm layer 1. It includes a substrate 13, a piezoelectric thin film 12, and a protective film 11. The substrate 13 is disposed at the bottom, the piezoelectric thin film 12 is disposed above the substrate 13, and the protective film 11 is disposed above the piezoelectric thin film 12.

[0025] The protective film 11 is a transparent film with at least one through-hole D. A piezoelectric film 12 has raised structures E at corresponding positions of each vent D in the protective film 11, with a gap between the back side of the raised structures E and the substrate 13. The raised structures E are formed by local deformation of the piezoelectric film 12 under vacuum, resulting in protrusions away from the substrate 13 at corresponding positions of each vent D in the protective film 11. A first electrode layer 14 is disposed between the protective film 11 and the piezoelectric film 12, forming annular electrodes at each vent D in the protective film 11. A second electrode layer 15 is disposed between the substrate 13 and the piezoelectric film 12. The first electrode layer 14 and the second electrode layer 15 drive the deformation of the raised structures E to generate sound. If multiple vents D exist, the multiple raised structures E are arranged in a one-to-one correspondence with the multiple vents D.

[0026] Working principle: The sound-generating diaphragm layer has at least one through-hole D in the protective film 11, and a piezoelectric film 12 is used to provide a protruding structure E at the corresponding position of the through-hole D. At the same time, a first electrode layer 14 is provided between the protective film 11 and the piezoelectric film 12, and a second electrode layer 15 is provided between the substrate 13 and the piezoelectric film 12. Finally, the protruding structure E is driven to deform by the first electrode layer 14 and the second electrode layer 15 to generate sound.

[0027] Beneficial effects: The raised structure E is the result of pre-stretching the piezoelectric film 12. The film is stretched and thinned, resulting in a larger vibration frequency and better sound production in the high-frequency range.

[0028] In one embodiment, the sound-generating membrane layer 1 can be disposed within the electronic paper display device. The sound-generating membrane layer 1 employs a sandwich structure consisting of a transparent thin film material as a substrate 13, a transparent thin film material including at least one through-hole D as a protective film 11, and a transparent piezoelectric film 12 between the two. Both the protective film 11 and the substrate 13 are made of materials with a light transmittance greater than 90% and a bending radius of 2mm-3mm, preferably PET (Polyethylene terephthalate, commonly known as polyester resin, is a condensation polymer of terephthalic acid and ethylene glycol), or other highly flexible and highly transparent materials. The piezoelectric film 12 is a flexible piezoelectric generating membrane of polyvinylidene fluoride (PVDF), preferably with a thickness of 5-20µm, and possessing high flexibility, low voltage (10~30V), and wide-band sound generation characteristics (20Hz~20kHz).

[0029] In some embodiments, the protrusion structure E is a dome structure formed by vacuum suction at the position corresponding to the vent hole D when the piezoelectric film is attached to the protective film, and the diameter of the vent hole D is in the range of 1.5mm to 3.5mm.

[0030] By employing a vacuum suction process on a protective film 11 with multiple through-holes D, a piezoelectric film 12 is attached to the transparent protective film 11. At each through-hole D on the protective film 11, a raised structure E is formed due to the vacuum suction, creating a gap between the back of the raised structure E and the substrate. A transparent electrode layer, the first electrode layer 14, is disposed between the protective film 11 and the PVDF piezoelectric film 12; a transparent electrode layer, the second electrode layer 15, is disposed between the substrate 13 and the piezoelectric film 12. Both the first electrode layer 14 and the second electrode layer 15 are made of indium tin oxide (ITO) or graphene and are transparent. Indium tin oxide (ITO) is a substitution solid solution, a transparent brown film or yellowish-gray block, composed of 90% In₂O₃ and 10% SnO₂. It is mainly used in the manufacture of liquid crystal displays, flat panel displays, plasma displays, touch screens, electronic paper, organic light-emitting diodes (OLEDs), solar cells, antistatic coatings, transparent conductive coatings for EMI shielding, and various optical coatings.

[0031] The detailed working process of this embodiment is as follows: The sound-generating membrane layer is formed by providing at least one through-hole D in the protective film 11, and a piezoelectric film 12 is used to provide a protruding structure E at the corresponding position of the through-hole D. At the same time, a first electrode layer 14 is provided between the protective film 11 and the piezoelectric film 12, and a second electrode layer 15 is provided between the substrate 13 and the piezoelectric film 12. Finally, the protruding structure E is driven to deform by the first electrode layer 14 and the second electrode layer 15 to generate sound.

[0032] Beneficial effects: This embodiment provides a sound-generating diaphragm layer 1. A first electrode layer 14 is disposed between the protective film 11 and the piezoelectric film 12 to form annular electrodes at each vent D of the protective film. An alternating voltage is applied to the annular electrodes to form a piezoelectric effect. This causes the protrusions E formed at the corresponding positions of each vent D of the piezoelectric film 12 to undergo radial expansion and contraction due to the piezoelectric effect, thereby achieving sound generation. The protrusions E are the result of pre-stretching the piezoelectric film 12. The film is stretched and thinned, resulting in a high vibration frequency and good high-frequency sound generation effect.

[0033] In some embodiments, the protective film 11 is made of PET film, and the piezoelectric film 12 is made of PVDF material. The corresponding beneficial effects are: since the perforations in the protective film 11 (PET film material) utilize the support and thickness of the PET film itself to form the vibration cavity of the PVDF film, no additional cavity construction is required. The raised structure E formed by vacuum suction is to enhance the vibration amplitude of the PVDF piezoelectric film 12. During vacuum suction, the PVDF film at each vent D is pre-stretched. Specifically, the raised structure E is a dome-shaped structure formed at the position corresponding to the vent D when the piezoelectric film 12 is attached to the protective film 11. The piezoelectric film 12 at the formed dome structure is stretched and thinned, making its piezoelectric characteristics more pronounced. The film vibration frequency range is wider, better reproducing sound quality, thus helping to improve sound quality. In terms of price, the cost of perforations in the PET film is significantly lower than other methods of forming the sound cavity, resulting in lower overall cost.

[0034] In some embodiments, the piezoelectric film can be at least one of polyvinylidene fluoride (PVDF) film, lead zirconium titanate (ZZT) film, or transparent zinc oxide film. Specifically, PVDF is a polymer material with a piezoelectric effect, and its sound generation is essentially due to the vibration of the diaphragm driving the air to produce sound. When the film is pre-stretched and thinned, it has the following effects:

[0035] Its mass density decreases: the mass per unit area of ​​the diaphragm decreases. According to the frequency formula of the vibration system (such as the relationship between the frequency and mass of a simple pendulum), the smaller the mass, the smaller the vibration inertia, the faster the response speed, and the higher the frequency of vibration.

[0036] Stiffness change: During stretching, the molecular chains become more regularly oriented, increasing the membrane stiffness (resistance to deformation). Stiffness is positively correlated with vibration frequency (similar to a string being tighter, producing a higher pitch), thus supporting higher frequency vibrations. At the same time, the low-frequency response is less prone to attenuation due to the improved membrane extensibility, thereby widening the frequency range.

[0037] A wider frequency response range results in more faithful sound: The human ear can hear frequencies ranging from approximately 20Hz to 20kHz. Ordinary loudspeakers may experience distortion in the high or low frequency range due to material limitations. With a thinner PVDF film, high-frequency extension is better (e.g., reaching above 40kHz), and low-frequency extension is deeper (e.g., below 20Hz), allowing for the reproduction of more details in music (such as instrument overtones and the impact of bass drums).

[0038] It features improved transient response: the lightweight and high-rigidity diaphragm has a stronger ability to follow electrical signals, and the "onset" and "attenuation" of the sound are faster (similar to the clarity of the moment when a musical instrument is plucked), avoiding trailing distortion and making the sound cleaner and more layered.

[0039] Through experimentation, the inventors have found that PZT film (lead zirconium titanate) and transparent zinc oxide film can also replace PVDF film as piezoelectric films.

[0040] like Figure 1 As shown, the sound-emitting membrane layer 1 includes a substrate 13, a piezoelectric thin film 12, and a protective film 11. The substrate 13 is disposed at the bottom, the piezoelectric thin film 12 is disposed above the substrate 13, and the protective film 11 is disposed above the piezoelectric thin film 12.

[0041] like Figure 2 and Figure 3 As shown in the figure, this utility model embodiment proposes an electronic paper display device, including a sound-emitting film layer 1, a waterproof protective film layer 2, an electronic paper ink layer 3, a substrate layer 4, and a driver chip 41.

[0042] The electronic paper ink layer 3 has a display side and a non-display side; the substrate layer 4 is connected to both the electronic paper ink layer 3 and the sound-emitting membrane layer 1; the driver chip 41 is connected to the substrate layer 4 to control the display of the electronic paper ink layer 3 and the sound-emitting membrane layer 1.

[0043] An electronic paper ink layer 3 is disposed between the sound-emitting diaphragm layer 1 and the substrate layer 4. The connection includes implementations such as electrical connections. In some embodiments, the sound-emitting diaphragm layer 1 is disposed near the display side of the electronic paper ink layer 3, and the substrate layer 4 is disposed near the non-display side of the electronic paper ink layer 3. Specifically, the electronic paper ink layer 3 is divided into a display side and a non-display side. The sound-emitting diaphragm layer 1 is disposed on the display side of the electronic paper ink layer 3, and the substrate layer 4 is disposed on the non-display side of the electronic paper ink layer 3.

[0044] Beneficial effects: When the sound-emitting membrane layer 1 is placed on the non-display side of the substrate layer 4, the sound vibration may affect the display effect of the electronic paper ink layer 3 on the substrate layer 4; furthermore, placing the sound closer to the user side (i.e., the display side) will result in a better sound effect, while placing it on the non-display side requires the sound to pass through the substrate layer 4, which can easily affect the sound effect. A waterproof protective membrane layer 2 is disposed between the sound-emitting membrane layer 1 and the electronic paper ink layer 3, and is bonded to the sound-emitting membrane layer 1 using transparent optical adhesive 5; the transparent optical adhesive 5 has a light transmittance >95%, ensuring the mechanical stability between the waterproof protective membrane layer 2 and the sound-emitting membrane layer 1 without affecting the optical effect. OCA (Optically Clear Adhesive) is commonly used as the transparent optical adhesive, a special adhesive used to bond transparent optical components (such as lenses). It is colorless and transparent, has a light transmittance of over 95%, good bonding strength, can be cured at room temperature or medium temperature, and has low curing shrinkage. The waterproof protective membrane layer 2 is preferably made of polyethylene terephthalate film with a thickness of 200um, a light transmittance of more than 90%, and a surface hardness of >3H.

[0045] In some embodiments, the projected area of ​​the sound-emitting membrane layer 1 on the substrate layer 4 is less than or equal to the projected area of ​​the waterproof protective membrane layer 2 on the substrate layer 4. Specifically, the size of the waterproof protective membrane layer 2 may be slightly larger than the size of the sound-emitting membrane layer 1, and the difference between the width and / or height of the projection of the waterproof protective membrane layer 2 on the substrate layer 4 and the width and / or height of the projection of the sound-emitting membrane layer 1 on the substrate layer 4 is greater than or equal to 2 mm to ensure the overall device shape consistency. In one embodiment, the size of the waterproof protective membrane layer 2 may also be equal to the size of the sound-emitting membrane layer 1.

[0046] The electronic paper ink layer 3 is disposed between the waterproof protective film layer 2 and the substrate layer 4. The electronic paper ink layer 3 has a third electrode layer 32, which is also made of indium tin oxide (TIO) or graphene and is transparent. The top of the electronic paper ink layer is provided with a layer of self-contained transparent optical adhesive 31. The self-contained transparent optical adhesive 31 is made of the same material as the transparent optical adhesive 5, with a light transmittance of >95%, a thickness of <5um, and a light transmittance of >95%. The waterproof protective film layer 2 and the electronic paper ink layer 3 are bonded and connected by the self-contained transparent optical adhesive 31.

[0047] An insulating adhesive 34 is provided at the bottom of the electronic paper ink layer 3, and the electronic paper ink layer 3 is bonded to the substrate layer 4 through the insulating adhesive 34. In one embodiment, the insulating adhesive 34 is made of black silicone, specifically a graphene + acrylate polymer.

[0048] The electronic paper ink layer 3 includes a third electrode layer 32; the substrate layer 4 includes a fourth electrode layer 42, and the driver chip 41 is connected to the fourth electrode layer 42 by an anisotropic conductive adhesive film; the first electrode layer 14 is connected to the fourth electrode layer 42 through a first silver paste, the second electrode layer 15 is connected to the fourth electrode layer 42 through a second silver paste, and the third electrode layer 32 is connected to the fourth electrode layer 42 through a third silver paste. The first electrode layer 14, the second electrode layer 15, and the third electrode layer 32 are all connected to their respective ITO traces in the fourth electrode layer.

[0049] In this embodiment, the electronic paper ink layer 3, from top to bottom, includes a self-contained transparent optical adhesive 31, a third electrode layer 32, an electronic paper ink film 33, and an insulating adhesive 34, that is, according to... Figure 1 The arrangement is from left to right. The electronic paper ink film 33 is the core material of the electronic paper display module, responsible for displaying the pattern actually seen by the human eye. The electronic paper ink film 33 is laminated onto the substrate (i.e., substrate layer 4). The substrate acts as the pixel electrode of the electronic paper display screen, controlling the black-and-white changes of each pixel in the electronic paper ink film 33. The electronic paper ink film 33 is waterproof, effectively preventing external moisture and dust from entering the internal space, improving its reliability and lifespan.

[0050] The substrate layer 4, serving as the bottom driving structure, employs an amorphous silicon thin-film transistor (a-Si TFT) or a low-temperature polycrystalline silicon thin-film transistor (LTPS-TFT) as the driving substrate. In one embodiment, its thickness is 500~700um. The substrate layer 4 is disposed on the non-display side of the electronic paper ink layer 3. The substrate layer 4 includes a driving chip 41 and a fourth electrode layer 42, which are connected by an anisotropic conductive adhesive film 6. The fourth electrode layer 42 is made of indium tin oxide (TIO) or graphene.

[0051] Anisotropic conductive film is a special coating material applied and bonded between substrates a and b, restricting current flow only in the vertical z-axis direction between substrates a and b. It combines unidirectional conductivity with adhesive bonding, solving the problem of connecting fine wires that traditional connectors could not handle. In this utility model patent, the anisotropic conductive film serves as a wire for connection.

[0052] In one embodiment, the electronic paper display device further includes: a waterproof protective film layer 2 disposed between the sound-emitting film layer 1 and the electronic paper ink layer 3; a first through-hole A penetrating the piezoelectric film 12, the substrate 13, the waterproof protective film layer 2, and the electronic paper ink layer 3 between the first electrode layer 14 and the fourth electrode layer 42; a second through-hole B penetrating the substrate 13, the waterproof protective film layer 2, and the electronic paper ink layer 3 between the second electrode layer 15 and the fourth electrode layer 42; and a third through-hole C penetrating between the third electrode layer 32 and the fourth electrode layer 42; wherein the silver paste disposed in the first through-hole A is the first silver paste, the silver paste disposed in the second through-hole B is the second silver paste, and the silver paste disposed in the third through-hole C is the third silver paste.

[0053] Specifically, the fourth electrode layer 42 is manifested as pins and circuits. The driver chip 41 is connected to the pins of the fourth electrode layer 42 through the anisotropic conductive film 6 (ACF), and the pins of the fourth electrode layer 42 are connected to the circuits. The circuits are connected to the first electrode layer 14 and the second electrode layer 15 in the sound-emitting film layer 1, and the third electrode layer 32 in the electronic paper ink layer 3 through silver paste. The fourth electrode layer 42 also includes multiple pixel electrodes and gate electrodes (gate: gate; the gate is the control electrode of the field-effect transistor, and its function is to control the current between the drain and the source by changing the gate voltage). The circuits in the fourth electrode layer 42 are connected to each pixel electrode and the gate electrode respectively. Through matrix control, the driver chip can control each pixel in the substrate layer 4. The common electrode ITO of the electronic ink film is connected to the driver IC through the ITO circuit corresponding to the TFT via silver paste, realizing the driver IC's control of the electrodes on the electronic paper. The upper electrode of the sound-emitting film 11 is connected to the driver IC through silver paste and the lower electrode is connected to the driver IC through the ITO circuit corresponding to the TFT via silver paste, realizing the driver IC's control of the sound-emitting film 11.

[0054] After the driver chip 41 is connected to the pins of the fourth electrode layer 42, and since the pins of the fourth electrode layer 42 are connected to the circuit, and then connected to the first electrode layer 14 and the second electrode layer 15 respectively through the circuit of the fourth electrode layer 42, the driver chip 41 drives and controls the sound-emitting diaphragm layer 1. Specifically, since the first electrode layer 14 and the second electrode layer 15 apply alternating voltage to the annular electrode under the action of the driver chip 41 through the fourth electrode layer 42, forming a piezoelectric effect, the protrusion structure E formed at each vent hole D of the piezoelectric film 12 will undergo radial expansion and contraction deformation due to the piezoelectric effect, thereby realizing sound generation and sound generation control.

[0055] After the driver chip 41 is connected to the pins of the fourth electrode layer 42, and since the pins of the fourth electrode layer 42 are connected to the circuit, and then connected to the third electrode layer 32 through the circuit of the fourth electrode layer 42, the driver chip 41 drives and controls the electronic paper ink film 33. Specifically, the third electrode layer 32 (including the third upper electrode and the third lower electrode) in the electronic paper ink layer 3 provides an alternating electric field under the action of the driver chip 41 through the fourth electrode layer 42, thereby controlling the display of the electronic paper ink film 33.

[0056] The detailed working process of this embodiment is as follows: By connecting the driver chip 41 to the fourth electrode layer 42, and then connecting the fourth electrode layer 42 to the first electrode layer 14 and the second electrode layer 15 respectively, the driver chip 41 achieves driving control of the sound-emitting diaphragm layer 1. Simultaneously, by connecting the driver chip 41 to the fourth electrode layer 42, and then connecting the fourth electrode layer 42 to the third electrode layer 32, the driver chip 41 controls the electronic paper ink layer 3, thereby controlling the display and its content. Because the first electrode layer 14 and the second electrode layer 15, under the action of the driver chip 41 through the fourth electrode layer 42, apply alternating voltage to the annular electrode, forming a piezoelectric effect, the protrusions E formed at each vent D of the piezoelectric film 12 will undergo radial expansion and contraction due to the piezoelectric effect, thus achieving sound generation and control, further realizing the technical effect of independent sound generation in the electronic paper display device. Furthermore, because the sound-emitting diaphragm is directly installed inside the device, it avoids the need for an additional, separate sound-emitting device, which would make the device too large. This ensures that the device can produce sound while maintaining its portability, thereby improving the user experience.

[0057] In some embodiments, the first and second silver pastes are disposed on the same side of the driver chip 41, and the third silver paste is disposed on the other side of the driver chip 41. Specifically, the points of each silver paste on the driver chip 41 form silver dots. There are no requirements for the lateral positional relationship or center distance between the silver dots, and they are disposed outside the AA region, but the closer they are to the AA region, the better. The AA (Active Area) region is the core working area on the chip, mainly used for transistor manufacturing.

[0058] Beneficial effect: If the silver spots formed by the silver paste are concentrated on one side, it will cause the traces of the substrate layer 4 to be too dense, thereby increasing the width of the substrate layer 4. In order to avoid increasing the width of the substrate layer 4, the first silver paste and the second silver paste are placed on the same side of the driver chip 41, and the third silver paste is placed on the other side of the driver chip 41. This arrangement can facilitate the traces.

[0059] In some embodiments, such as Figure 1As shown, the device is bonded to the edges of the substrate layer 4, electronic paper ink layer 3, waterproof protective film layer 2, and sound-emitting film layer 1 using edge-sealing adhesive 7. The edge-sealing adhesive 7 is used to fill gaps at the edges, preventing moisture, dust, or other impurities from entering the interior of each layer, extending its service life. It also smooths the edges of each layer, making them neater and more aesthetically pleasing, and fixes the edges of each layer to prevent loosening or movement, thus protecting the edges of each layer. The edge-sealing adhesive 7 is typically made of epoxy resin.

[0060] In another embodiment, such as Figure 4 and Figure 5 As shown, an electronic paper display device is provided. Based on the above embodiments, the device provided in this embodiment further includes a flexible circuit board 8, which is connected to the fourth electrode layer 42 via an anisotropic conductive adhesive film. A flexible printed circuit board (FPC) is a highly reliable and extremely flexible printed circuit board made with polyimide or polyester film as the substrate. It features high wiring density, light weight, thinness, and good bending properties.

[0061] The detailed working process of this embodiment is as follows: The external circuit can control the driver chip 41 through the flexible circuit board 8. By connecting the external circuit through the flexible circuit board 8, the driver chip 41 can be controlled to achieve customized driving control of the sound-emitting diaphragm layer 1 and the electronic paper ink layer 3. The sound emission and display driving control strategies of this device can be quickly changed without changing the circuit and driver chip 41 settings, thereby improving the flexibility of this device.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A sound-emitting membrane layer, the sound-emitting membrane layer comprising a protective film, a piezoelectric thin film, and a substrate, characterized in that: The protective film is configured as a transparent film including at least one through-hole for ventilation; The piezoelectric thin film is disposed between the protective film and the substrate, and has a protrusion structure corresponding to the vent hole, with a gap formed between the protrusion structure and the substrate; A first electrode layer is provided between the protective film and the piezoelectric film, and a second electrode layer is provided between the substrate and the piezoelectric film. The first electrode layer and the second electrode layer drive the deformation of the protruding structure to generate sound.

2. The sound-generating diaphragm layer according to claim 1, characterized in that, The raised structure is a dome structure formed by vacuum suction at the position corresponding to the vent hole when the piezoelectric film is attached to the protective film. The diameter of the vent hole is in the range of 1.5mm to 3.5mm.

3. The sound-generating diaphragm layer according to claim 1, characterized in that, The piezoelectric film is at least one of polyvinylidene fluoride film, lead zirconium titanate film, or transparent zinc oxide film. The light transmittance of both the protective film and the substrate is greater than 90%, and the bending radius is 2mm-3mm.

4. An electronic paper display device, characterized in that, The electronic paper display device includes: The sound-emitting membrane layer includes the sound-emitting membrane layer as described in any one of claims 1-3; The electronic paper ink layer has a display side and a non-display side; The substrate layer, the electronic paper ink layer and the sound-emitting membrane layer are both connected to the substrate layer; A driver chip is connected to the substrate layer to control the display of the electronic paper ink layer and the sound emission of the sound-emitting diaphragm layer; The electronic paper ink layer is disposed between the sound-emitting membrane layer and the substrate layer, with the sound-emitting membrane layer disposed near the display side of the electronic paper ink layer and the substrate layer disposed near the non-display side of the electronic paper ink layer.

5. The electronic paper display device as described in claim 4, characterized in that, The electronic paper display device further includes: The electronic paper ink layer includes a third electrode layer; The substrate layer includes a fourth electrode layer, and the driving chip is connected to the fourth electrode layer by an anisotropic conductive adhesive film. The first electrode layer is connected to the fourth electrode layer through a first silver paste, the second electrode layer is connected to the fourth electrode layer through a second silver paste, and the third electrode layer is connected to the fourth electrode layer through a third silver paste.

6. The electronic paper display device as claimed in claim 5, characterized in that, The electronic paper display device further includes: A waterproof protective membrane layer is disposed between the sound-emitting membrane layer and the electronic paper ink layer; A first through-hole is provided between the first electrode layer and the fourth electrode layer, penetrating the piezoelectric film, the substrate, the waterproof protective film layer, and the electronic paper ink layer; A second through-hole is provided between the second electrode layer and the fourth electrode layer, penetrating the substrate, the waterproof protective film layer, and the electronic paper ink layer; A through-hole is provided between the third electrode layer and the fourth electrode layer; wherein, conductive silver paste is provided in the first through-hole, the second through-hole and the third through-hole; the fourth electrode layer is connected to the first electrode layer, the second electrode layer and the third electrode layer respectively through the silver paste.

7. An electronic paper display device according to claim 5, characterized in that, The electronic paper display device further includes a flexible circuit board; wherein the flexible circuit board is connected to the fourth electrode layer through an anisotropic conductive adhesive film.

8. An electronic paper display device according to claim 5, characterized in that, The first silver paste and the second silver paste are disposed on the same side of the driver chip, and the third silver paste is disposed on the other side of the driver chip.

9. An electronic paper display device according to claim 7, characterized in that, The electronic paper display device further includes: A waterproof protective film layer is disposed between the sound-emitting film layer and the electronic paper ink layer, wherein the projected area of ​​the sound-emitting film layer on the substrate layer is less than or equal to the projected area of ​​the waterproof protective film layer on the substrate layer.

10. An electronic paper display device according to claim 9, characterized in that, The difference between the width and / or height of the projection of the waterproof protective membrane layer onto the substrate layer and the width and / or height of the projection of the sound-emitting membrane layer onto the substrate layer is greater than or equal to 2 mm.

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