Mobile phone explosion-proof film suitable for under-screen fingerprint identification

Abstract

The utility model discloses a kind of mobile phone explosion-proof film suitable for under-screen fingerprint identification, including by upper to lower sequentially laminated fixed scratch-proof layer, explosion-proof buffer layer, high-transmittance low-refractive adaptive layer, laminating layer and peelable release film;The high-transmittance low-refractive adaptive layer is double-layer composite structure, including low-refractive substrate and ultra-low-refractive antireflection film, overall refractive index≤1.45, total transmittance≥92%.Through the high-transmittance low-refractive structure design of explicitness, effectively reduce the attenuation and interference of fingerprint identification signal, make under-screen fingerprint identification more quickly, more accurate, bring smooth and convenient unlocking experience for user;Meanwhile, the scratch-proof layer and explosion-proof buffer layer structure of synergic optimization can resist all-round daily scratch and accidental impact, provide firm and reliable protection guarantee for mobile phone screen.

Description

Technical Field

[0001] This utility model belongs to the field of mobile phone film technology, and relates to a mobile phone explosion-proof film adapted for under-screen fingerprint recognition. Background Technology

[0002] The core of under-display fingerprint recognition technology (especially optical fingerprint recognition) relies on the precise transmission of signals through light penetration and reflection. As a protective carrier for the screen, the optical properties of the screen protector directly affect the recognition performance. Existing technologies suffer from two major flaws: first, the definition of "high transmittance and low refractive index" is vague, failing to clearly define the specific quantitative ranges of material refractive index and transmittance, leading to uncontrolled optical parameters in actual production; second, the lack of interlayer optical matching design results in excessively large differences in refractive index between layers, causing multiple reflections and scattering of light, leading to attenuation of the fingerprint recognition signal. Furthermore, some solutions sacrifice explosion-proof performance in pursuit of transmittance, failing to simultaneously meet usage requirements. Utility Model Content

[0003] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0004] A mobile phone explosion-proof film adapted for under-display fingerprint recognition includes a scratch-resistant layer, an explosion-proof buffer layer, a high-transmittance low-refractive-index adapter layer, an adhesive layer, and a peelable release film, which are stacked and fixed from top to bottom.

[0005] The high-transmittance, low-refractive-index adapter layer is a two-layer composite structure, comprising a low-refractive-index substrate and an ultra-low-refractive-index antireflective film, with an overall refractive index ≤1.45 and a total transmittance ≥92%.

[0006] As a further embodiment of this invention: the low-refractive-index substrate is made of optical-grade cyclic olefin polymer or fluorinated polyimide material.

[0007] As a further embodiment of this invention: the ultra-low refractive antireflective film is made of perfluoropolyether modified silica or aluminum fluoride.

[0008] As a further embodiment of this utility model: the refractive index difference between the low-refractive substrate and the ultra-low refractive antireflective film is 0.08-0.15, and the thickness of the ultra-low refractive antireflective film is 1 / 4 of the core operating wavelength of the under-display fingerprint recognition module.

[0009] As a further embodiment of this utility model: the anti-scratch layer and the explosion-proof buffer layer, and the explosion-proof buffer layer and the high-transmittance low-refractive-index adapter layer are all bonded together with optical pressure-sensitive adhesive.

[0010] The beneficial effects of this utility model are as follows: Through the clearly defined high light transmittance and low refraction structure design, the attenuation and interference of fingerprint recognition signals are effectively reduced, making under-display fingerprint recognition faster and more accurate, bringing users a smooth and convenient unlocking experience; at the same time, the synergistically optimized anti-scratch layer and explosion-proof buffer layer structure can resist daily scratches and accidental impacts in all directions, providing a solid and reliable protection for the mobile phone screen.

[0011] In addition, the structure of each layer is precisely matched, resulting in strong overall stability and excellent durability, which can maintain good performance for a long time. The clear and well-defined optical design logic reduces the difficulty of industrial production and can be adapted to various mobile phone models equipped with optical under-display fingerprint recognition. It has a wide range of applications and combines excellent practical value with good market promotion prospects. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0013] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. It should be understood that this application is not limited to the exemplary embodiments disclosed herein. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0014] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0015] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0016] In the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0017] This utility model provides a reference. Figure 1 In this embodiment of the utility model, a mobile phone explosion-proof film adapted for under-screen fingerprint recognition includes a scratch-resistant layer 1, an explosion-proof buffer layer 2, a high light transmittance and low refractive index adaptation layer 3, an adhesive layer 4, and a peelable release film 5, which are stacked and fixed from top to bottom.

[0018] Among them, the high-transmittance low-refractive-index adapter layer 3 is composed of a low-refractive-index substrate 31 and an ultra-low-refractive-index antireflective film 32.

[0019] Low-refractive-index substrate 31: Optical-grade cyclic olefin polymer (COP) or fluorinated polyimide (FPI) are selected. These two materials are currently the preferred high-transmittance, low-refractive-index materials—transmittance ≥92%, refractive index strictly controlled at 1.40-1.45 (lower than PC material's 1.58), and thickness 0.05-0.10mm. Its advantages include: low refractive index reduces light refraction loss within the substrate; high transmittance ensures light penetration without attenuation; haze ≤0.1%, avoiding light scattering interference with fingerprint signals; and the material itself has good mechanical toughness, which can synergistically enhance the film's impact resistance with the explosion-proof buffer layer 2.

[0020] Ultra-low refractive index antireflective film 32: It is prepared by vacuum ion plating process using perfluoropolyether (PFPE) modified silica or aluminum fluoride (AlF3) (coating uniformity error ≤ ±5nm), with a light transmittance ≥99.5% and a refractive index further reduced to 1.25-1.35 (the lowest among all layers of the film), and a thickness of 60-110nm.

[0021] The ultra-low refractive index of the antireflective coating 32 is lower than that of the low refractive index substrate 31 (difference 0.08-0.15), forming an "ultra-low refractive index-low refractive index" layered structure to reduce interlayer reflection. The thickness is set to 1 / 4 of the working wavelength (500-600nm) of the under-display fingerprint recognition core. The principle of optical interference cancellation is used to cancel the reflected light at the upper and lower interfaces of the film, so that the reflection loss is ≤0.3%. The perfluoropolyether modified silica material has both low refractive index and wear resistance properties, avoiding the failure of the antireflective coating due to friction.

[0022] Scratch-resistant layer 1: Zirconia-doped silica coating with a refractive index of 1.55-1.60. The difference between the coating and the explosion-proof buffer layer 2 (refractive index 1.50-1.53) is ≤0.1, reducing interface reflection; surface hardness ≥9H, resisting daily scratches.

[0023] Explosion-proof buffer layer 2: Porous polycarbonate layer with a porosity of 30%-40%. It absorbs impact energy through its honeycomb structure (improving explosion-proof performance by 30%), and reduces light obstruction due to its perforated design, with a light transmittance of ≥97%; refractive index of 1.50-1.53. The difference in refractive index between the layer and the adjacent layer (scratch-resistant layer 1, high-transmittance low-refractive-index adapter layer 3) is ≤0.05, ensuring the continuity of light transmission.

[0024] Adhesive layer 4: Optical grade silicone pressure-sensitive adhesive, refractive index 1.48-1.52, with a difference of ≤0.12 between it and the low-refractive substrate 31 (1.40-1.45), to prevent light reflection at the interface between the high-transmittance low-refractive adapter layer 3 and adhesive layer 4; adhesion 12-18g / 25mm, ensuring that the film adheres tightly to the screen without air bubbles and leaves no adhesive residue after removal.

[0025] The anti-scratch layer 1 and the explosion-proof buffer layer 2, as well as the explosion-proof buffer layer 2 and the high-transmittance, low-refractive-index adapter layer 3, are all bonded together using optical pressure-sensitive adhesive.

[0026] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0027] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A mobile phone explosion-proof film adapted for under-display fingerprint recognition, characterized in that, It includes a scratch-resistant layer (1), an explosion-proof buffer layer (2), a high-transmittance, low-refractive-index adapter layer (3), an adhesive layer (4), and a peelable release film (5) that are stacked and fixed from top to bottom. The high-transmittance, low-refractive-index adapter layer (3) is a double-layer composite structure, including a low-refractive-index substrate (31) and an ultra-low-refractive-index antireflective film (32), with an overall refractive index ≤1.45 and a total transmittance ≥92%.

2. The explosion-proof film for mobile phones adapted for under-display fingerprint recognition according to claim 1, characterized in that, The low-refractive-index substrate (31) is made of optical-grade cyclic olefin polymer or fluorinated polyimide material.

3. The explosion-proof film for mobile phones adapted for under-display fingerprint recognition according to claim 1, characterized in that, The ultra-low refractive antireflective film (32) is made of perfluoropolyether modified silica or aluminum fluoride.

4. The explosion-proof film for mobile phones adapted for under-display fingerprint recognition according to claim 1, characterized in that, The refractive index difference between the low-refractive substrate (31) and the ultra-low refractive antireflective film (32) is 0.08-0.15, and the thickness of the ultra-low refractive antireflective film (32) is 1 / 4 of the core working wavelength of the under-display fingerprint recognition module.

5. The explosion-proof film for mobile phones adapted for under-display fingerprint recognition according to claim 1, characterized in that, The anti-scratch layer (1) and the explosion-proof buffer layer (2), and the explosion-proof buffer layer (2) and the high-transmittance low-refractive-index adapter layer (3) are all bonded together with optical pressure-sensitive adhesive.

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