Optical fingerprint identification module

Abstract

The utility model discloses an optical fingerprint identification module which comprises a protective cover plate, an infrared sensing module and an infrared light source module, and the infrared sensing module and the infrared light source module are arranged outside one side of the protective cover plate in parallel. The protective cover plate comprises a cover plate base layer and an infrared color changing layer, the infrared color changing layer is arranged on the surface of the side, facing the infrared sensing module and the infrared light source module, of the cover plate base layer, and the infrared color changing layer can respond to infrared light and be converted into a colorless state from a colored state. The optical fingerprint identification module improves the appearance effect of the cover plate.

Description

An optical fingerprint recognition module Technical Field

[0001] This utility model relates to fingerprint recognition technology, and more particularly to an optical fingerprint recognition module. Background Technology

[0002] Optical fingerprint recognition modules are devices that identify individuals by collecting and analyzing fingerprint images based on optical imaging principles. They are widely used in consumer electronics and security fields. To ensure the transmittance of light during fingerprint imaging, existing optical fingerprint recognition modules typically use transparent and colorless protective covers, resulting in a monotonous appearance that fails to meet users' personalized needs. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this utility model provides an optical fingerprint recognition module that improves the appearance of the cover plate.

[0004] The technical problem to be solved by this utility model is achieved through the following technical solution:

[0005] An optical fingerprint recognition module includes a protective cover, an infrared sensing module, and an infrared light source module. The infrared sensing module and the infrared light source module are arranged side by side on one side of the protective cover. The protective cover includes a cover base and an infrared color-changing layer. The infrared color-changing layer is disposed on the surface of the cover base facing the infrared sensing module and the infrared light source module. The infrared color-changing layer can change from a colored state to a colorless state in response to infrared light.

[0006] Furthermore, the infrared color-changing layer is aldehyde-based dithiophene-ethylene or triphenylamine-based dithiophene-ethylene, with a thickness of 5-20 μm.

[0007] Furthermore, the protective cover also includes an infrared filter layer, which is disposed between the base layer of the cover and the infrared color-changing layer, and the light transmission wavelength of the infrared filter layer corresponds to the light emission wavelength of the infrared sensing module.

[0008] Furthermore, the infrared filter layer is composed of multiple first dielectric films and multiple second dielectric films stacked alternately, with different refractive indices between the first dielectric films and the second dielectric films.

[0009] Furthermore, the first dielectric film is a titanium dioxide film with a thickness of 80-120 nm; the second dielectric film is a silicon dioxide film with a thickness of 140-180 nm.

[0010] Furthermore, the protective cover also includes an anti-fingerprint layer, which is disposed on the surface of the base layer of the cover facing away from the infrared sensing module and the infrared light source module.

[0011] Furthermore, the anti-fingerprint layer is a fluoropolymer with a thickness of 2-20 nm.

[0012] Furthermore, the protective cover also includes an adhesion promoting layer, which is disposed between the protective cover and the anti-fingerprint layer.

[0013] Furthermore, the adhesion-promoting layer is a silane coupling agent with a thickness of 8-20 nm.

[0014] Furthermore, the base layer of the cover plate is made of tempered glass or sapphire glass with a thickness of 0.5-1.5mm. This invention has the following beneficial effects: The optical fingerprint recognition module of this invention improves the appearance of the cover plate by setting the infrared color-changing layer in the protective cover plate to meet the personalized needs of users; when fingerprint recognition is not required, the infrared sensing module and the infrared light source module are in a closed state, and the infrared color-changing layer appears colored in the absence of infrared light irradiation, providing an appearance color for the protective cover plate; when fingerprint recognition is required, the infrared sensing module and the infrared light source module are in a closed state, and the infrared color-changing layer appears colorless under the infrared light irradiation of the infrared light source module, thus meeting the requirements of the infrared sensing module to collect fingerprint images. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the structure of the optical fingerprint recognition module provided by this utility model.

[0016] Figure 2 is a structural schematic diagram of another optical fingerprint recognition module provided by this utility model. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and embodiments, examples of which are shown in the drawings. Throughout the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0018] 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.

[0019] Furthermore, the terms "first," "second," and "third" 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," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0020] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," "fixing," and "setting," 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; and they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Example 1

[0022] As shown in Figure 1, an optical fingerprint recognition module includes a protective cover plate 1, an infrared sensing module 2, and an infrared light source module 3. The infrared sensing module 2 and the infrared light source module 3 are arranged side by side on one side of the protective cover plate 1. The protective cover plate 1 includes a cover plate base layer 11 and an infrared color-changing layer 12. The infrared color-changing layer 12 is disposed on the surface of the cover plate base layer 11 facing the infrared sensing module 2 and the infrared light source module 3. The infrared color-changing layer 12 can change from a colored state to a colorless state in response to infrared light.

[0023] The optical fingerprint recognition module of this utility model improves the appearance of the protective cover 1 by setting the infrared color-changing layer 12 in the protective cover 1 to meet the personalized needs of users. When fingerprint recognition is not required, the infrared sensing module 2 and the infrared light source module 3 are in the off state, and the infrared color-changing layer 12 appears colored in the absence of infrared light to provide an appearance color for the protective cover 1. When fingerprint recognition is required, the infrared sensing module 2 and the infrared light source module 3 are in the on state, and the infrared color-changing layer 12 appears colorless in the infrared light of the infrared light source module 3 to meet the needs of the infrared sensing module 2 to collect fingerprint images.

[0024] In a specific implementation, the infrared sensing module 2 and the infrared light source module 3 can be directly bonded and fixed to the same side surface of the protective cover plate 1 using OCA optical adhesive. Alternatively, the protective cover plate 1, the infrared sensing module 2, and the infrared light source module 3 can be assembled in the same terminal housing to fix the relative position between the protective cover plate 1 and the infrared sensing module 2 and the infrared light source module 3 through the terminal housing.

[0025] In this embodiment, the cover plate base layer 11 is tempered glass or sapphire glass with high transmittance and a thickness of 0.5-1.5mm.

[0026] Preferably, the infrared color-changing layer 12 may be, but is not limited to, aldehyde-based dithiophene-ethylene or triphenylamine-based dithiophene-ethylene, and its thickness is 5-20 μm.

[0027] The aldehyde-based dithienylethylene or triphenylamine-based dithienylethylene is based on dithienylethylene, with aldehyde or triphenylamine groups introduced through molecular modification to replace the thiophene ring. The aldehyde-based dithienylethylene or triphenylamine-based dithienylethylene is uniformly mixed in an ink substrate or other polymer substrate at a mass percentage of 20-50% to form a corresponding infrared-changing ink or infrared-changing coating. This is then applied to one side surface of the cover plate base layer 11 via screen printing or coating processes, and finally cured naturally or by baking to form the infrared-changing layer 12.

[0028] Preferably, the protective cover 1 further includes an infrared filter layer 13, which is disposed between the cover base layer 11 and the infrared color-changing layer 12, and the light transmission wavelength of the infrared filter layer 13 corresponds to the light emission wavelength of the infrared sensing module 2.

[0029] The optical fingerprint recognition module of this utility model provides an infrared filter layer 13 between the cover plate base layer 11 and the infrared color-changing layer 12. The bandpass filtering effect of the infrared filter layer 13 is used to block the infrared light portion of the external natural light, so as to avoid the infrared color-changing layer 12 being affected by the infrared light in the external natural light. At the same time, it allows the infrared light emitted by the infrared sensing module 2 to pass through, so as to meet the requirements of the infrared sensing module 2 to collect fingerprint images.

[0030] In this embodiment, the infrared filter layer 13 is composed of multiple first dielectric films and multiple second dielectric films stacked alternately, with different refractive indices between the first dielectric films and the second dielectric films; the first dielectric film is a titanium dioxide film with a thickness of 80-120 nm; the second dielectric film is a silicon dioxide film with a thickness of 140-180 nm; and the number of layers of the first dielectric film and the second dielectric film is 3-6.

[0031] Example 2

[0032] As an optimized solution of Embodiment 1, in this embodiment, as shown in FIG2, the protective cover 1 further includes an anti-fingerprint layer 14, which is disposed on the surface of the cover base layer 11 facing away from the infrared sensing module 2 and the infrared light source module 3.

[0033] The optical fingerprint recognition module of this utility model improves the anti-fingerprint effect of the protective cover plate 1 by setting the anti-fingerprint layer 14 in the protective cover plate 1, so as to avoid fingerprint residue on the surface of the protective cover plate 1.

[0034] In this embodiment, the anti-fingerprint layer 14 is a fluoropolymer, which may be, but is not limited to, perfluoropolyether or fluorosilicone resin, and its thickness is 2-20 nm. The fluoropolymer has low surface energy and hydrophobic and oleophobic properties, which can reduce the adhesion of fingerprint grease to the protective cover plate 1, so as to achieve the purpose of preventing fingerprint residue.

[0035] Preferably, the protective cover 1 further includes an adhesion promoting layer 15, which is disposed between the protective cover 1 and the anti-fingerprint layer 14.

[0036] The optical fingerprint recognition module of this utility model provides an adhesion promoting layer 15 between the protective cover plate 1 and the anti-fingerprint layer 14. This layer 15 utilizes the high bonding strength between the adhesion promoting layer 15 and the cover plate base layer 11 and the anti-fingerprint layer 14 to improve the adhesion of the anti-fingerprint layer 14 to the cover plate base layer 11 and prevent the anti-fingerprint layer 14 from falling off.

[0037] In this embodiment, the adhesion promoting layer 15 is a silane coupling agent, which may be, but is not limited to, methacryloxysilane, and has a thickness of 8-20 nm. The silane coupling agent contains silane oxygen (-OCH3), which can undergo hydrolysis and condensation reactions with hydroxyl groups (-OH) in various substrates such as glass, metal, and ceramics to form Si-O-Si covalent bonds, thereby forming a strong bonding force. At the same time, the silane coupling agent has a high surface energy (higher than the surface energy of the cover plate base layer 11), which can provide a better adhesion surface for the anti-fingerprint layer 14, thereby improving the adhesion of the anti-fingerprint layer 14 to the cover plate base layer 11.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present 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 still be made to the technical solutions of the present utility model, and these modifications or equivalent substitutions cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the present utility model.

Claims

1. An optical fingerprint recognition module, comprising a protective cover, an infrared sensing module, and an infrared light source module, wherein the infrared sensing module and the infrared light source module are arranged side-by-side on one side of the protective cover; characterized in that, The protective cover plate includes a cover plate base layer and an infrared color-changing layer. The infrared color-changing layer is disposed on the surface of the cover plate base layer facing the infrared sensing module and the infrared light source module. The infrared color-changing layer can respond to infrared light changing from a colored state to a colorless state.

2. The optical fingerprint recognition module according to claim 1, characterized in that, The infrared color-changing layer is aldehyde-based dithiophene-ethylene or triphenylamine-based dithiophene-ethylene, and its thickness is 5-20 μm.

3. The optical fingerprint recognition module according to claim 1, characterized in that, The protective cover also includes an infrared filter layer, which is disposed between the base layer of the cover and the infrared color-changing layer. The light transmission wavelength of the infrared filter layer corresponds to the light emission wavelength of the infrared sensing module.

4. The optical fingerprint recognition module according to claim 3, characterized in that, The infrared filter layer is composed of multiple first dielectric films and multiple second dielectric films stacked alternately, with different refractive indices between the first dielectric films and the second dielectric films.

5. The optical fingerprint recognition module according to claim 4, characterized in that, The first dielectric film is a titanium dioxide film with a thickness of 80-120 nm; the second dielectric film is a silicon dioxide film with a thickness of 140-180 nm.

6. The optical fingerprint recognition module according to claim 1, characterized in that, The protective cover also includes an anti-fingerprint layer, which is disposed on the surface of the base layer of the cover facing away from the infrared sensing module and the infrared light source module.

7. The optical fingerprint recognition module according to claim 6, characterized in that, The anti-fingerprint layer is a fluoropolymer with a thickness of 2-20 nm.

8. The optical fingerprint recognition module according to claim 1, characterized in that, The protective cover also includes an adhesion promoting layer, which is disposed between the protective cover and the anti-fingerprint layer.

9. The optical fingerprint recognition module according to claim 8, characterized in that, The adhesion-promoting layer is a silane coupling agent with a thickness of 8-20 nm.

10. The optical fingerprint recognition module according to claim 1, characterized in that, The base layer of the cover plate is made of tempered glass or sapphire glass with a thickness of 0.5-1.5mm.

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