Screen protection film, two-liquid mixed hardened adhesive layer and electronic equipment

Abstract

The embodiment of the utility model provides a screen protection film and electronic equipment, the screen protection film is applied to a screen with an under-screen ultrasonic fingerprint recognition function, the screen protection film comprises a glass layer and a two-liquid mixed hardened glue layer, and the two-liquid mixed hardened glue layer is used for attaching the glass layer to the surface of the screen. The two-liquid mixed hardened adhesive layer comprises an optical adhesive layer, a base material layer and a silica gel layer which are arranged in sequence, and the propagation time of ultrasonic waves in the two-liquid mixed hardened adhesive layer is equal to or equal to that of ultrasonic waves; the sum of the propagation time of the ultrasonic waves in the optical adhesive layer and the substrate layer is equal to or smaller than; the sum of the propagation time of the ultrasonic waves in the substrate layer and the silica gel layer is equal to the sum, N is a positive integer, and T0 is the period of the ultrasonic waves. According to the embodiment of the invention, the influence of the protective film on fingerprint identification under the ultrasonic screen can be improved, and fingerprint identification can be better realized.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the field of fingerprint identification technology, and particularly relate to a screen protection film, a two-liquid mixed hardening glue layer and an electronic device. BACKGROUND

[0002] With the popularity of ultrasonic under-screen fingerprint technology in electronic devices such as smart phones, how to obtain more accurate fingerprint identification effect has become the focus of research on ultrasonic under-screen fingerprint technology. However, in order to protect the screen, the user usually pastes a protective film on the surface of the screen, which will seriously affect the identification effect of ultrasonic under-screen fingerprint.

[0003] Therefore, how to improve the influence of the protective film on the ultrasonic under-screen fingerprint identification and better achieve fingerprint identification has become a technical problem to be solved. CONTENT OF THE UTILITY MODEL

[0004] Therefore, one of the technical problems solved by embodiments of the present application is to provide a screen protection film, a two-liquid mixed hardening glue layer and an electronic device, which can improve the influence of the protective film on the ultrasonic under-screen fingerprint identification and better achieve fingerprint identification.

[0005] In a first aspect, a screen protection film is provided, which is applied to a screen with under-screen ultrasonic fingerprint identification function, and the screen protection film comprises a glass layer and a two-liquid mixed hardening glue layer, the two-liquid mixed hardening glue layer is used to attach the glass layer to the surface of the screen, the two-liquid mixed hardening glue layer comprises an optical glue layer, a substrate layer and a silica gel layer arranged in sequence, and the propagation time of the ultrasonic wave in the two-liquid mixed hardening glue layer is equal to or the sum of the propagation times of the ultrasonic wave in the optical glue layer and the substrate layer is equal to or the sum of the propagation times of the ultrasonic wave in the substrate layer and the silica gel layer is equal to wherein N is a positive integer, and T0 is the period of the ultrasonic wave.

[0006] In a second aspect, a two-liquid mixed hardening glue layer is provided, which is applied to attach a glass layer to the surface of a screen with under-screen ultrasonic fingerprint identification function, and the two-liquid mixed hardening glue layer comprises an optical glue layer, a substrate layer and a silica gel layer arranged in sequence, and the propagation time of the ultrasonic wave in the two-liquid mixed hardening glue layer is equal to or the sum of the propagation times of the ultrasonic wave in the optical glue layer and the substrate layer is equal to or the sum of the propagation times of the ultrasonic wave in the substrate layer and the silica gel layer is equal to wherein N is a positive integer, and T0 is the period of the ultrasonic wave; and the two-liquid mixed hardening glue layer is provided with an upper release film and a lower release film on two sides thereof.

[0007] In a third aspect, a two-liquid mixed hardening adhesive layer is applied to adhere a glass layer to a surface of a screen having an under-screen ultrasonic fingerprint recognition function, the two-liquid mixed hardening adhesive layer comprising an optical adhesive layer, a substrate layer and a silica gel layer arranged in sequence, wherein a propagation time of the ultrasonic wave in the two-liquid mixed hardening adhesive layer is equal to or a sum of propagation times of the ultrasonic wave in the optical adhesive layer and the substrate layer is equal to or a sum of propagation times of the ultrasonic wave in the substrate layer and the silica gel layer is equal to wherein N is a positive integer, and T0 is a period of the ultrasonic wave; the two-liquid mixed hardening adhesive layer is provided with an upper release film and a lower release film on two sides thereof.

[0008] In a fourth aspect, a two-liquid mixed hardening adhesive layer is provided, which is applied to adhere a glass layer to a surface of a screen having an under-screen ultrasonic fingerprint recognition function, the two-liquid mixed hardening adhesive layer comprising an optical adhesive layer, a substrate layer and a silica gel layer arranged in sequence, wherein a thickness of the optical adhesive layer is equal to λ2 / 2*O or less than λ2 / 8, a thickness of the substrate layer is equal to λ4 / 2*P or less than λ4 / 8, and a thickness of the silica gel layer is equal to λ1 / 2*Q or less than λ1 / 8, wherein O, P and Q are positive integers, λ1 is a wavelength of a longitudinal wave of the ultrasonic wave propagating in the silica gel layer, λ2 is a wavelength of a longitudinal wave of the ultrasonic wave propagating in the optical adhesive layer, and λ4 is a wavelength of a longitudinal wave of the ultrasonic wave propagating in the substrate layer; the two-liquid mixed hardening adhesive layer is provided with an upper release film and a lower release film on two sides thereof.

[0009] In a fifth aspect, an electronic device is provided, comprising a screen having an under-screen ultrasonic fingerprint recognition function, and any one of the screen protective films or the two-liquid mixed hardening adhesive layer and a glass layer adhered by the two-liquid mixed hardening adhesive layer.

[0010] In the scheme of the embodiments of the present application, the screen protective film comprises a glass layer and a two-liquid mixed hardening adhesive layer, the glass layer being adhered to a surface of the screen by the two-liquid mixed hardening adhesive layer, and the two-liquid mixed hardening adhesive layer comprising an optical adhesive layer, a substrate layer and a silica gel layer arranged in sequence. The thicknesses of the optical adhesive layer, the substrate layer and the silica gel layer are set in the embodiments of the present application, so as to improve the influence of the tempered protective film on the ultrasonic under-screen fingerprint recognition and better achieve fingerprint recognition. BRIEF DESCRIPTION OF DRAWINGS

[0011] Some specific embodiments of the embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings, which are shown by way of illustration and not limitation. The same reference signs in the drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that the drawings are not necessarily drawn to scale. In the drawings:

[0012] Figure 1Structure diagram of a display screen of an ultrasonic under-screen fingerprint identification according to an embodiment of the present application;

[0013] Figure 2 Structure diagram of a display screen and a screen protection film of an ultrasonic under-screen fingerprint identification according to an embodiment of the present application;

[0014] Figure 3 Graph of ultrasonic transmittance of a glass layer at an ultrasonic frequency of 11 MHz;

[0015] Figure 4 Structure diagram of a screen protection film according to an embodiment of the present application. DETAILED DESCRIPTION

[0016] Referring to Figure 1 , the basic principle of the ultrasonic under-screen fingerprint identification is that an ultrasonic fingerprint module is installed below an OLED screen, and ultrasonic waves emitted by the ultrasonic fingerprint module pass through the OLED screen to reach the surface of a finger, and the fingerprint of the finger reflects the ultrasonic waves. Since the reflectivity of the valleys and ridges of the fingerprint to the ultrasonic waves is different, the reflected echo passes through the OLED screen and is received by the ultrasonic fingerprint module, and a fingerprint image can be obtained according to the difference in the echo.

[0017] Referring to Figure 2 , the structure of the screen protection film includes a glass layer (Glass) and a two-liquid mixed hardening adhesive layer (AB adhesive), and the two-liquid mixed hardening adhesive layer includes an optical adhesive layer, a substrate layer, and a silica gel layer arranged in sequence. The optical adhesive layer (OCA, Optically Clear Adhesive) and the silica gel layer have adhesion and are respectively attached to the two sides of the substrate layer, so they are called a two-liquid mixed hardening adhesive layer.

[0018] In this embodiment, the substrate layer can be made of various organic materials, and the substrate layer plays the role of a carrier plate. For example, the substrate layer can be a PET (Polyethylene terephthalate) film. PET is the abbreviation of polyethylene terephthalate, and its full name is polyethylene terephthalate. It is also called polyester. PET is a common plastic material with good transparency, mechanical properties, and chemical corrosion resistance.

[0019] Table 1 is Figure 2 the acoustic parameters of the materials used in each layer of the glass layer and the two-liquid mixed hardening adhesive layer. The glass layer is a high acoustic impedance material, and the constituent materials of the two-liquid mixed hardening adhesive layer are all low acoustic impedance materials. Generally, 5 is taken as the dividing line between high acoustic impedance materials and low acoustic impedance materials.

[0020] Table 1

[0021] Material Sound velocity um / ns Acoustic impedance M rayl Explanation Glass layer 5.5 14 High acoustic impedance Optical glue layer 1.8 2 Low acoustic impedance Substrate layer 2.4 3.2 Low acoustic impedance Silicone layer 1.2 1.25 Low acoustic impedance

[0022] According to the law of reflection of sound waves, when the sound wave transmits from medium 1 to medium 2:

[0023] Wherein, Z1 and Z2 are the acoustic impedance of medium 1 and medium 2 respectively, and rf is the ultrasonic reflectivity when the sound wave transmits from medium 1 to medium 2. If the average acoustic impedance of the two-liquid mixed hardening glue layer is 2, then when the sound wave transmits from the glass layer to the two-liquid mixed hardening glue layer, the ultrasonic reflectivity rf=(14-2) / (14+2)=75%, that is Figure 2 The ultrasonic reflectivity of reflection 1 in the formula is 75%. Similarly, it can be obtained that the ultrasonic reflectivity of reflection 1≈the ultrasonic reflectivity of reflection 2≈the ultrasonic reflectivity of reflection 3≈the ultrasonic reflectivity of reflection 4=75%. Therefore, pasting the tempered protective film on the screen surface will cause only a small proportion of the reflected ultrasonic waves of the finger to be received by the ultrasonic fingerprint module, resulting in a sharp deterioration of the fingerprint recognition effect.

[0024] In order to improve the penetration rate of ultrasonic waves in different media, the thickness of the medium needs to be specially designed based on the acoustic characteristics of the material. When the ultrasonic wave penetrates medium 2 from medium 1 and then enters medium 3, the ultrasonic penetration rate T1 is shown in formula one:

[0025] Formula one. Wherein, Z1 and Z2, Z3 are the acoustic impedance of medium 1 and medium 2, medium 3 respectively, D is the thickness of medium 2, λ2 is the wavelength of the longitudinal wave of the ultrasonic wave in medium 2.

[0026] When D is exactly N*λ2 / 2, where N is a positive integer and λ2 is the wavelength of the ultrasonic wave in medium 2, T1 has a maximum value of When the ultrasonic wave enters medium 1 from medium 3, the law is the same.

[0027] In this embodiment, medium 1 is a finger, medium 2 is a glass layer, medium 3 is a two-liquid mixed hardening glue layer, and the ultrasonic frequency is 11MHz. Referring to Figure 3 When the thickness of the glass layer is around 250um and 500um, the ultrasonic penetration rate T1 has a maximum value, and the half wavelength is exactly 250um. When the thickness D of medium 2 is less than λ2 / 8, the ultrasonic penetration rate T1 decreases rapidly with the increase of the thickness. At the same time, when the thickness of medium 2 deviates from N*λ2 / 2, the ultrasonic penetration rate T1 will decrease significantly, and when the thickness D of medium 2 is equal to λ

[0028] 2 / 4+N*λ2 / 2, the ultrasonic penetration rate T1 has a minimum value.

[0029] It can be seen from the above analysis that the thickness of the medium 2 satisfies D=N*λ2 / 2, the ultrasonic wave penetration rate T1 is relatively high, or D<λ2 / 8 and the smaller the D is, the higher the ultrasonic wave penetration rate T1 is. The thickness of the medium 2 is far away from D=λ2 / 4+N*λ2 / 2, and the ultrasonic wave penetration rate T1 can be avoided to decrease significantly.

[0030] When the glass layer D<λ2 / 8 and the smaller the D is, the strength of the glass layer is not enough to protect the screen well, when the thickness of the glass layer is λ2 / 2, the thickness of the glass layer can be ensured to provide protection for the screen, when the thickness of the glass layer is D=N*λ2 / 2 and N is greater than or equal to 2, the glass layer is too thick, which can cause the ultrasonic wave propagation path to be too long to cause signal strength loss, in addition, the glass is too thick, which affects the user experience, therefore, when the thickness of the glass layer is λ2 / 2, the protection of the screen can be ensured and better user experience can be provided. Specifically, the thickness of the glass layer can be 250um. In addition, the ultrasonic wave penetration rate is more sensitive to the thickness of the glass, therefore, the thickness of the glass is designed to have a floating range of plus or minus 10%.

[0031] Referring to Figure 4 The embodiment of the present application provides a screen protection film applied to a screen with an under-screen ultrasonic fingerprint identification function. The screen protection film comprises a glass layer and a two-liquid mixed hardening adhesive layer, and the two-liquid mixed hardening adhesive layer is used to attach the glass layer to the surface of the screen.

[0032] Specifically, one side of the two-liquid mixed hardening adhesive layer is used to set a release film, or both sides of the two-liquid mixed hardening adhesive layer are used to set a release film.

[0033] When one side of the two-liquid mixed hardening adhesive layer is used to set a release film, the other side of the two-liquid mixed hardening adhesive layer is directly attached to the glass layer, when the release film is peeled off from one side of the two-liquid mixed hardening adhesive layer, the two-liquid mixed hardening adhesive layer attaches the glass layer to the surface of the screen, and when the glass layer is attached, the optical adhesive layer is attached to the glass layer and the silica gel layer is attached to the screen.

[0034] When both sides of the two-liquid mixed hardening adhesive layer are used to set a release film, when the release film is peeled off from one side of the two-liquid mixed hardening adhesive layer, one side of the two-liquid mixed hardening adhesive layer is attached to the surface of the screen; when the release film is peeled off from the other side of the two-liquid mixed hardening adhesive layer, the other side of the two-liquid mixed hardening adhesive layer is attached to the surface of the glass.

[0035] The two-liquid mixed hardening adhesive layer comprises an optical adhesive layer, a substrate layer and a silica gel layer arranged in sequence.

[0036] The propagation time of the ultrasonic wave in the two-liquid mixed hardening adhesive layer is equal to or the sum of the propagation time of the ultrasonic wave in the optical adhesive layer and the substrate layer equal to or; the sum of the propagation time of the ultrasonic wave in the substrate layer and the silica gel layer equal to wherein N is a positive integer, and T0 is the period of the ultrasonic wave. Wherein D OCA is the thickness of the optical adhesive layer, u OCA is the wave velocity of the longitudinal wave of the ultrasonic wave propagating in the optical adhesive layer, D PET is the thickness of the substrate layer, u PET is the wave velocity of the longitudinal wave of the ultrasonic wave propagating in the substrate layer, D SL is the thickness of the silica gel layer, u SL is the wave velocity of the longitudinal wave of the ultrasonic wave propagating in the silica gel layer.

[0037] From the above analysis, the propagation time of the ultrasonic wave in the two-liquid mixed hardening adhesive layer is equal to The ultrasonic wave penetration rate will be relatively high.

[0038] If the propagation time of the ultrasonic wave in the two-liquid mixed hardening adhesive layer cannot be equal to The sum of the propagation time of the ultrasonic wave in the optical adhesive layer and the substrate layer or the substrate layer and the silica gel layer is equal to

[0039] Specifically, if the frequency of the ultrasonic wave is 11MHz; the propagation time of the ultrasonic wave in the two-liquid mixed hardening adhesive layer is equal to The material of the silica gel layer has a greater influence on the penetration rate of the ultrasonic wave, that is, the penetration rate of the ultrasonic wave is more sensitive to the material of the silica gel layer, so the thickness of the silica gel layer is set to be thinner than the optical adhesive layer and the substrate layer, which can reduce the attenuation of the ultrasonic wave energy. For example, the thickness of the optical adhesive layer is 30um; the thickness of the substrate layer is 25um; and the thickness of the silica gel layer is 20um. In this example, the propagation time of the ultrasonic wave in the two-liquid mixed hardening adhesive layer is equal to 30 / 1.8+25 / 2.4+20 / 1.2=43.75ns, and the period is 90.9ns, that is, in this scheme, N can be equal to 1.

[0040] In some specific implementations of the embodiments of the present application, the thickness of the silica gel layer is less than the thickness of the optical adhesive layer; the thickness of the silica gel layer is less than the thickness of the substrate layer. Thus, the influence of the tempered protective film on the ultrasonic under-screen fingerprint recognition is further improved, and the fingerprint recognition is better achieved.

[0041] In the scheme of the embodiments of the present application, the screen protective film includes a glass layer and a two-liquid mixed hardening adhesive layer, the glass layer is attached to the surface of the screen through the two-liquid mixed hardening adhesive layer, and the two-liquid mixed hardening adhesive layer includes an optical adhesive layer, a substrate layer and a silica gel layer arranged in sequence. The thickness of the optical adhesive layer, the substrate layer and the silica gel layer is set in the embodiments of the present application, so as to improve the influence of the tempered protective film on the ultrasonic under-screen fingerprint recognition, and better achieve the fingerprint recognition.

[0042] The embodiment of the present application also provides a two-liquid mixed hardening glue layer, which comprises an optical glue layer, a substrate layer and a silica gel layer arranged in sequence, and the propagation time of ultrasonic waves in the two-liquid mixed hardening glue layer is equal to or the sum of the propagation time of ultrasonic waves in the optical glue layer and the substrate layer is equal to or the sum of the propagation time of ultrasonic waves in the substrate layer and the silica gel layer is equal to wherein N is a positive integer, and T0 is the period of the ultrasonic waves; the two-liquid mixed hardening glue layer is provided with an upper release film and a lower release film on two sides thereof.

[0043] When one side of the two-liquid mixed hardening glue layer is provided with a release film, the other side of the two-liquid mixed hardening glue layer is directly attached to a glass layer, and when the release film is peeled off from one side of the two-liquid mixed hardening glue layer, the two-liquid mixed hardening glue layer attaches the glass layer to the surface of a screen.

[0044] When both sides of the two-liquid mixed hardening glue layer are provided with release films, when the release film is peeled off from one side of the two-liquid mixed hardening glue layer, one side of the two-liquid mixed hardening glue layer is attached to the surface of the screen; and when the release film is peeled off from the other side of the two-liquid mixed hardening glue layer, the other side of the two-liquid mixed hardening glue layer is attached to the surface of the glass.

[0045] The embodiment of the present application also provides a two-liquid mixed hardening glue layer, which comprises an optical glue layer, a substrate layer and a silica gel layer arranged in sequence, the thickness of the optical glue layer is equal to λ2 / 2*M or less than λ2 / 8, the thickness of the substrate layer is equal to λ4 / 2*M or less than λ4 / 8, and the thickness of the silica gel layer is equal to λ1 / 2*M or less than λ1 / 8, wherein M is a positive integer, λ1 is the wavelength of the longitudinal wave of the ultrasonic waves propagating in the silica gel layer, λ2 is the wavelength of the longitudinal wave of the ultrasonic waves propagating in the optical glue layer, and λ4 is the wavelength of the longitudinal wave of the ultrasonic waves propagating in the substrate layer.

[0046] When one side of the two-liquid mixed hardening glue layer is provided with a release film, the other side of the two-liquid mixed hardening glue layer is directly attached to a glass layer, and when the release film is peeled off from one side of the two-liquid mixed hardening glue layer, the two-liquid mixed hardening glue layer attaches the glass layer to the surface of a screen.

[0047] When both sides of the two-liquid mixed hardening glue layer are provided with release films, when the release film is peeled off from one side of the two-liquid mixed hardening glue layer, one side of the two-liquid mixed hardening glue layer is attached to the surface of the screen; and when the release film is peeled off from the other side of the two-liquid mixed hardening glue layer, the other side of the two-liquid mixed hardening glue layer is attached to the surface of the glass.

[0048] In some specific implementations of the embodiment of the present application, if the sum of the propagation time of ultrasonic waves in the optical glue layer and the substrate layer is equal to then the thickness of the silica gel layer is equal to λ1 / 2*M or less than λ1 / 8.

[0049] Specifically, if the frequency of the ultrasonic wave is 11MHz; the thickness of the optical adhesive layer is 55um; the thickness of the substrate layer is 30um; and the thickness of the silica gel layer is 55um, in this example, the sum of the propagation time of the ultrasonic wave in the optical adhesive layer and the substrate layer is equal to 55 / 1.8+30 / 2.4=43ns, and the period is 90.9ns, that is, in this scheme, N can be equal to 1, and the half of the wavelength of the longitudinal wave of the ultrasonic wave propagating in the silica gel layer is about 54.5 microns, that is, in this scheme, M can be equal to 1.

[0050] Alternatively, if the sum of the propagation time of the ultrasonic wave in the substrate layer and the silica gel layer is equal to , the thickness of the optical adhesive layer is equal to λ2 / 2*M, or less than λ2 / 8; wherein M is a positive integer, λ1 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the silica gel layer, and λ2 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the optical adhesive layer.

[0051] Specifically, if the frequency of the ultrasonic wave is 11MHz; the thickness of the optical adhesive layer is 75um; the thickness of the substrate layer is 20um; and the thickness of the silica gel layer is 45um, in this example, the sum of the propagation time of the ultrasonic wave in the substrate layer and the silica gel layer is equal to 45 / 1.2+20 / 2.4=45.8ns, and the period is 90.9ns, that is, in this scheme, N can be equal to 1, and the half of the wavelength of the longitudinal wave of the ultrasonic wave propagating in the optical adhesive layer is about

[0052] 81.81 microns, that is, in this scheme, M can be equal to 1, and the error of the thickness of the optical adhesive layer is, for example, plus or minus 8.32%. In this embodiment, if the thickness error of the optical adhesive layer, the silica gel layer and the substrate layer is controlled within 10%, the attenuation of the ultrasonic wave is less, and the fingerprint recognition effect can be further improved.

[0053] The embodiments of the present application further set the thickness of the optical adhesive layer, the substrate layer and the silica gel layer, so as to better improve the influence of the tempered protective film on the ultrasonic wave under-screen fingerprint recognition, and improve the effect of fingerprint recognition.

[0054] The current application frequency of ultrasonic wave under-screen fingerprint is generally 10-13MHz, and considering the process technology of the glass layer, the thickness of the glass layer is set to λ3 / 2, and λ3 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the glass.

[0055] Specifically, the thickness of the glass layer is 250um.

[0056] Referring to Figure 4 , the embodiments of the present application provide a screen protective film applied to a screen with under-screen ultrasonic wave fingerprint recognition function. The screen protective film comprises a glass layer and a two-liquid mixed hardening adhesive layer, and the glass layer is attached to the surface of the screen through the two-liquid mixed hardening adhesive layer.

[0057] Specifically, one side of the two-liquid mixed hardening glue layer is used to set the release film, or both sides of the two-liquid mixed hardening glue layer are used to set the release film.

[0058] When one side of the two-liquid mixed hardening glue layer is used to set the release film, the other side is attached to the glass layer. When the release film is peeled off from one side of the two-liquid mixed hardening glue layer, the two-liquid mixed hardening glue layer is used to attach the glass layer to the surface of the screen.

[0059] When both sides of the two-liquid mixed hardening glue layer are used to set the release film, when the release film is peeled off from one side of the two-liquid mixed hardening glue layer, one side of the two-liquid mixed hardening glue layer is attached to the surface of the glass layer; when the release film is peeled off from the other side of the two-liquid mixed hardening glue layer, the other side of the two-liquid mixed hardening glue layer is attached to the surface of the screen.

[0060] The two-liquid mixed hardening glue layer comprises an optical glue layer, a substrate layer and a silica gel layer arranged in sequence, the thickness of the optical glue layer is equal to λ2 / 2*O or less than λ2 / 8, the thickness of the substrate layer is equal to λ4 / 2*P or less than λ4 / 8, and the thickness of the silica gel layer is equal to λ1 / 2*Q or less than λ1 / 8, wherein M is a positive integer, λ1 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the silica gel layer, λ2 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the optical glue layer, and λ4 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the substrate layer.

[0061] In the scheme of the embodiment of the present application, the screen protection film comprises a glass layer and a two-liquid mixed hardening glue layer, the glass layer is attached to the surface of the screen through the two-liquid mixed hardening glue layer, and the two-liquid mixed hardening glue layer comprises an optical glue layer, a substrate layer and a silica gel layer arranged in sequence. The thickness of the optical glue layer, the substrate layer and the silica gel layer is set in the embodiment of the present application, so that the influence of the tempered protection film on the ultrasonic under-screen fingerprint recognition is improved, and the fingerprint recognition is better achieved.

[0062] Specifically, if the frequency of the ultrasonic wave is 11 MHz, the thickness of the optical glue layer is 75 um, the thickness of the substrate layer is 20 um, and the thickness of the silica gel layer is 55 um, in this example, half of the wavelength of the longitudinal wave of the ultrasonic wave propagating in the silica gel layer is about 54.5 microns, that is, in the scheme, Q can be equal to 1; half of the wavelength of the longitudinal wave of the ultrasonic wave propagating in the optical glue layer is about 81.81 microns, that is, in the scheme, O can be equal to 1, and the error of the thickness of the optical glue layer is, for example, plus or minus 8.32%; λ4 / 8 is about 27.27 microns, that is, in the scheme, the thickness of the substrate layer 20 um is less than λ4 / 8.

[0063] At present, the application frequency of ultrasonic under-screen fingerprint is generally 10-13 MHz, and considering the process technology of the glass layer, the thickness of the glass layer is set to λ3 / 2, and λ3 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the glass.

[0064] Specifically, the thickness of the glass layer is 250um.

[0065] Due to the process requirement of actual manufacturing, the thickness of each material has fluctuation, therefore, the propagation time and the floating range of thickness in the embodiment of the present application is plus or minus 20%.

[0066] Since the ultrasonic penetration rate is more sensitive to the thickness of the glass, therefore, the thickness of the glass is designed to have a floating range of plus or minus 10%.

[0067] Another embodiment of the present application further provides an electronic device, the electronic device comprising: a screen with an under-screen ultrasonic fingerprint identification function and any one of the screen protection films or the two-liquid mixed hardening glue layer and the glass layer attached through the two-liquid mixed hardening glue layer.

[0068] The embodiment of the present application will be further described below in combination with the drawings of the embodiment of the present application.

[0069] The electronic device of the embodiment of the present application includes but is not limited to:

[0070] (1) Mobile communication device: the feature of this kind of device is to have mobile communication function and to provide voice and data communication as the main target. This kind of terminal includes: smart phone (such as iPhone), multimedia phone, functional phone, and low-end phone, etc.

[0071] (2) Ultra-mobile personal computer device: this kind of device belongs to the category of personal computer, has computing and processing function, and generally has the feature of mobile Internet. This kind of terminal includes: PDA, MID and UMPC device, etc., such as iPad.

[0072] (3) Portable entertainment device: this kind of device can display and play multimedia content. This kind of device includes: audio and video player (such as iPod), handheld game console, electronic book, and smart toy and portable car navigation device.

[0073] (4) Door lock, car lock and other electronic devices with data interaction function.

[0074] So far, the specific embodiments of the present subject matter have been described. Other embodiments are within the scope of the appended claims. In some cases, the actions recited in the claims can be performed in a different order and still achieve desirable results. Additionally, the processes depicted in the figures do not necessarily require the particular order shown, or sequential order, to achieve the desired results. In certain implementations, multitasking and parallel processing can be advantageous.

[0075] It should also be noted that the terms "comprising," "including," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a... " does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

[0076] Each of the embodiments in the present specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each of the embodiments focuses on the difference from other embodiments. In particular, for the system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiments.

[0077] The above only describes the embodiments of the present application and is not intended to limit the present application. The present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A screen protector, applied to a screen with under-display ultrasonic fingerprint recognition function, characterized in that, The screen protector includes a glass layer and a two-component curable adhesive layer, wherein the two-component curable adhesive layer is used to attach the glass layer to the surface of the screen. The two-component mixed curing adhesive layer comprises an optical adhesive layer, a substrate layer, and a silicone layer arranged sequentially. The propagation time of the ultrasonic wave in the two-liquid mixed hardened adhesive layer is equal to Alternatively; the sum of the propagation times of the ultrasonic wave in the optical adhesive layer and the substrate layer is equal to Alternatively; the sum of the propagation times of the ultrasonic wave in the substrate layer and the silicone layer is equal to Where N is a positive integer and T0 is the period of the ultrasonic wave.

2. The screen protector according to claim 1, characterized in that, If the sum of the propagation times of the ultrasonic wave in the optical adhesive layer and the substrate layer is equal to Then the thickness of the silicone layer is equal to λ1 / 2*M, or less than λ1 / 8; or, If the sum of the propagation times of the ultrasonic wave in the substrate layer and the silicone layer is equal to The thickness of the optical adhesive layer is equal to λ2 / 2*M, or less than λ2 / 8; Where M is a positive integer, λ1 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the silicone layer, and λ2 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the optical adhesive layer.

3. The screen protector according to claim 2, characterized in that, If the frequency of the ultrasonic wave is 11MHz; and the substrate layer is a PET film; The thickness of the optical adhesive layer is 30 μm; the thickness of the substrate layer is 25 μm; and the thickness of the silicone layer is 20 μm. or, The thickness of the optical adhesive layer is 55 μm; the thickness of the substrate layer is 30 μm; and the thickness of the silicone layer is 55 μm. or, The thickness of the optical adhesive layer is 75 μm; the thickness of the substrate layer is 20 μm; and the thickness of the silicone layer is 45 μm.

4. The screen protector according to claim 1, characterized in that, The thickness of the silicone layer is less than the thickness of the optical adhesive layer; the thickness of the silicone layer is less than the thickness of the substrate layer.

5. The screen protector according to any one of claims 1-4, characterized in that, The propagation time is within a range of ±10%.

6. The screen protector according to any one of claims 1-4, characterized in that, The thickness of the glass layer is λ3 / 2, where λ3 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the glass.

7. The screen protector according to claim 5, characterized in that, The thickness of the glass layer is λ3 / 2, where λ3 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the glass.

8. The screen protector according to claim 1, characterized in that, One side of the two-liquid mixed hardening adhesive layer is used to set a release film, or both sides of the two-liquid mixed hardening adhesive layer are used to set a release film.

9. The screen protector according to any one of claims 1-4, characterized in that, The propagation time is within a range of ±20%.

10. A screen protector, applied to a screen with under-display ultrasonic fingerprint recognition function, characterized in that, The screen protector includes a glass layer and a two-component curable adhesive layer. The glass layer is used to adhere to the surface of the screen through the two-component curable adhesive layer. The two-component curable adhesive layer includes an optical adhesive layer, a substrate layer, and a silicone layer arranged sequentially. The thickness of the optical adhesive layer is equal to λ2 / 2*O or less than λ2 / 8. The thickness of the substrate layer is equal to λ4 / 2*P or less than λ4 / 8. The thickness of the silicone layer is equal to λ1 / 2*Q or less than λ1 / 8. Wherein, O, P, and Q are positive integers, λ1 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the silicone layer, λ2 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the optical adhesive layer, and λ4 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the substrate layer.

11. The screen protector according to claim 10, characterized in that, If the frequency of the ultrasonic wave is 11MHz; The thickness of the optical adhesive layer is 75 μm; the thickness of the substrate layer is 20 μm; and the thickness of the silicone layer is 55 μm.

12. The screen protector according to any one of claims 10-11, characterized in that, The thickness of the glass layer is λ3 / 2, where λ3 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the glass.

13. The screen protector according to claim 11, characterized in that, The thickness of the glass layer is 250 μm.

14. The screen protector according to claim 13, characterized in that, The thickness can fluctuate within a range of ±20%.

15. The screen protector according to claim 13, characterized in that, The thickness of the glass layer fluctuates within ±10%, and the thicknesses of the optical adhesive layer, the substrate layer, and the silicone layer fluctuate within ±20%.

16. The screen protector according to claim 10, characterized in that, The thickness can fluctuate within a range of ±10%.

17. A two-liquid mixed curing adhesive layer, applied to the surface of a screen with under-display ultrasonic fingerprint recognition function, characterized in that, The two-component mixed curing adhesive layer comprises an optical adhesive layer, a substrate layer, and a silicone layer arranged sequentially. The propagation time of the ultrasonic wave in the two-liquid mixed hardened adhesive layer is equal to Alternatively; the sum of the propagation times of the ultrasonic wave in the optical adhesive layer and the substrate layer is equal to Alternatively; the sum of the propagation times of the ultrasonic wave in the substrate layer and the silicone layer is equal to Where N is a positive integer, and T0 is the period of the ultrasonic wave; An upper release film and a lower release film are respectively provided on both sides of the two-liquid mixed hardening adhesive layer.

18. The two-component mixed hardening adhesive layer according to claim 17, characterized in that, The propagation time is within a range of ±20%.

19. The two-component mixed hardening adhesive layer according to claim 17, characterized in that, The propagation time is within a range of ±10%.

20. A two-liquid mixed curing adhesive layer, applied to the surface of a screen with under-display ultrasonic fingerprint recognition function, characterized in that, The two-component mixed curing adhesive layer comprises an optical adhesive layer, a substrate layer, and a silicone layer arranged sequentially. The thickness of the optical adhesive layer is equal to λ2 / 2*O or less than λ2 / 8, the thickness of the substrate layer is equal to λ4 / 2*P or less than λ4 / 8, and the thickness of the silicone layer is equal to λ1 / 2*Q or less than λ1 / 8, where O, P, and Q are positive integers, λ1 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the silicone layer, λ2 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the optical adhesive layer, and λ4 is the wavelength of the longitudinal wave of the ultrasonic wave propagating in the substrate layer. An upper release film and a lower release film are respectively provided on both sides of the two-liquid mixed hardening adhesive layer.

21. An electronic device, characterized in that, include: A screen with under-display ultrasonic fingerprint recognition function, a screen protective film according to any one of claims 1-16, or a two-liquid mixed hardening adhesive layer according to any one of claims 17-20, and a glass layer attached by the two-liquid mixed hardening adhesive layer.

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