Optical fingerprint identification module and electronic equipment

Abstract

The invention provides an optical fingerprint identification module and electronic equipment. The optical fingerprint identification module comprises a display screen, a fingerprint camera module and an anti-reflection assembly. Wherein the fingerprint camera module and the display screen are arranged at an interval in the thickness direction of the display screen, and a light path used for collecting fingerprints is formed between the display screen and the fingerprint camera module. The anti-reflection assembly is arranged in the light path and comprises at least one lens, and all the lenses in the anti-reflection assembly are concave lenses. The optical fingerprint identification module has a wide field angle, the fingerprint acquisition area can be increased, and thus the identification rate of the optical fingerprint identification module is improved.

Description

Technical Field

[0001] The present application relates to the field of electronics, and in particular to an optical fingerprint recognition module and an electronic device. Background Art

[0002] Fingerprint recognition technology mainly uses a fingerprint recognition module to obtain the user's fingerprint pattern, and stores the unique fingerprint features or fingerprint patterns in the obtained fingerprint pattern into a memory. Then, when the user performs a fingerprint scan again, the fingerprint recognition module will obtain the fingerprint features and compare them with the previously stored fingerprint features or fingerprint patterns to confirm the identity of the user. At present, the fingerprint recognition modules of electronic devices, such as mobile phones, generally include ultrasonic fingerprint recognition modules and optical fingerprint recognition modules. Optical fingerprint recognition modules have a wider range of applications due to their low cost. However, with the improvement of low-temperature polycrystalline oxide (LTPO) screen technology, the transmittance of the screen has gradually decreased. When the optical recognition module is located below the display screen, the reduction in transmitted light will cause the recognition rate of the optical fingerprint recognition module to decrease, and even the problem of non-recognition may occur. Summary of the invention

[0003] The present application provides an optical fingerprint recognition module and an electronic device to improve the visual field angle of the optical fingerprint recognition module, increase the fingerprint collection area, and thus improve the recognition rate of the optical fingerprint recognition module.

[0004] In a first aspect, the present application provides an optical fingerprint recognition module, comprising a display screen, a fingerprint camera module and an anti-reflection component. The fingerprint camera module is spaced apart from the display screen in the thickness direction of the display screen, and an optical path for collecting fingerprints is formed between the display screen and the fingerprint camera module. The anti-reflection component is arranged in the optical path, and the anti-reflection component includes at least one lens, and each lens in the anti-reflection component is a concave lens.

[0005] In the optical fingerprint recognition module of the present application, an anti-reflection component is arranged between the display screen and the fingerprint camera module, and each lens in the anti-reflection component is a concave lens. By arranging a concave lens, the light between the fingerprint camera module and the display screen can be diverged, thereby widening the field of view of the fingerprint camera module, thereby increasing the receiving area for fingerprint collection, and thus improving the recognition rate of the optical fingerprint recognition module. In addition, the optical fingerprint recognition module of the present application can make full use of the light path between the display screen and the fingerprint recognition module to avoid introducing additional space.

[0006] In an optional implementation, the antireflection assembly is formed by a concave lens, which is a single-sided concave lens or a double-sided concave lens. The concave lens of the antireflection assembly has at least one concave surface to achieve light divergence, thereby achieving an expansion of the field of view.

[0007] In an optional implementation, the antireflection assembly includes at least two concave lenses, which are spaced or bonded to each other. The combination of at least two concave lenses can further increase the divergence angle of light, thereby further expanding the angle of the field of view.

[0008] In an optional implementation, the anti-reflection component is bonded to the display screen. In an optional implementation, the anti-reflection component is bonded to the fingerprint camera module. The bonding method includes point glue bonding or back glue bonding, and the bonding method is flexible and can be assembled in any direction.

[0009] In an optional implementation, at least one side surface of each concave lens is provided with a concave-convex structure to increase the light transmission area of ​​the concave lens. By providing the concave-convex structure, the specific surface area of ​​the concave lens can be increased, the light transmission area of ​​the concave lens can be increased, and more light signals can be collected when collecting fingerprints.

[0010] In an optional implementation, the concave-convex structure is a wave-shaped concave-convex structure or a Fresnel ring. By providing the Fresnel ring on the surface of the concave lens, it can help to improve the field of view of the optical fingerprint recognition module.

[0011] In an optional implementation, the field of view angle of the optical fingerprint recognition module is 65-75°.

[0012] In a second aspect, the present application provides an electronic device, which may include the optical fingerprint recognition module of the present application.

[0013] The electronic devices of the present application include but are not limited to mobile phones, tablet computers, smart TVs, outdoor display screens and other devices.

[0014] The technical effects that can be achieved in the above-mentioned second aspect can be described with reference to the corresponding effects in the above-mentioned first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a mobile phone;

[0016] Figure 2 This is a schematic diagram of the structure of a mobile phone after removing the display screen in an embodiment;

[0017] Figure 3 is a schematic cross-sectional structure diagram of an optical fingerprint recognition module according to an embodiment;

[0018] Figure 4 is a schematic structural diagram of an optical fingerprint recognition module according to another embodiment;

[0019] Figure 5 is a schematic structural diagram of an optical fingerprint recognition module according to another embodiment;

[0020] Figure 6 is a schematic structural diagram of an optical fingerprint recognition module according to another embodiment;

[0021] Figure 7 is a schematic structural diagram of a concave lens according to an embodiment;

[0022] Figure 8 is a schematic structural diagram of a concave lens of another embodiment;

[0023] Fig. 9 This is a schematic diagram of the structure of an optical fingerprint recognition module according to an embodiment of the present application;

[0024] Fig.10 The figure is a schematic diagram of the structure of an existing optical fingerprint recognition module.

[0025] Reference numerals:

[0026] 11-display screen; 21-middle frame; 30-optical fingerprint recognition module; 31-fingerprint camera module; 311-lens; 312-lens barrel;

[0027] 313 - acquisition chip; 41 - anti-reflection component; 411 - concave lens; 412 - concave-convex structure. DETAILED DESCRIPTION

[0028] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0029] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be limiting of the present application. As used in the specification and appended claims of the present application, the singular expressions "a", "an", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context.

[0030] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0031] Optical fingerprint recognition modules are widely used in various electronic devices due to their low cost to realize fingerprint unlocking function. For easy understanding, the following uses mobile phones as an example to explain its specific application scenarios.

[0032] Figure 1 FIG. 1 is a schematic diagram of the structure of a mobile phone. Figure 1 As shown, an electronic device, such as a mobile phone, may include a display screen 11 and a middle frame 21 for fixing the display screen 11 and a rear cover plate (not shown in the figure). An optical fingerprint recognition module may be provided in the mobile phone. When the user places a finger at the position of the optical fingerprint recognition module, an automatic unlocking function may be realized. Among them, the display screen 11 may be used as a fingerprint collection panel of the optical fingerprint recognition module, and the user may place a finger on the surface of the display screen 11 to enter and exit the fingerprint collection.

[0033] Figure 2 This is a schematic diagram of the structure of a mobile phone after removing the display screen in an embodiment. Figure 2 As shown, the optical fingerprint recognition module 30 can be set at the bottom of the mobile phone and can be connected to the middle frame 21.

[0034] Figure 3 FIG. 1 is a schematic cross-sectional structure diagram of an optical fingerprint recognition module according to an embodiment of the present invention. Figure 3 As shown, the optical fingerprint recognition module may include a display screen 11, a fingerprint camera module 31 and an anti-reflection component 41.

[0035] The display screen 11 may be an LTPO display screen. The specific material composition of the display screen 11 is not limited in this application.

[0036] In the thickness direction of the display screen 11, the fingerprint camera module 31 can be arranged below the display screen 11. The fingerprint camera module 31 can include a lens 311, a lens barrel 312 for fixing the lens 311, and a collection chip 313. Among them, the lens 311 is fixed in the lens barrel 312. The lens barrel 312 can be fixedly connected to the middle frame 21. The collection chip 313 is arranged on the side away from the display screen 11 where the lens 311 is arranged. The light penetrating from the display screen 11 converges on the surface of the collection chip 313 after passing through the lens 311, and the collection chip 313 is used to obtain and store the fingerprint information carried in the light.

[0037] In the thickness direction of the display screen 11, the display screen 11 and the fingerprint camera module 31 are spaced apart, and a light path can be formed between the display screen 11 and the fingerprint camera module 31. When collecting fingerprints, light carrying fingerprint information can be incident from the display screen 11 to the fingerprint camera module 31, and the fingerprint camera module 31 collects the fingerprint information and stores it in the collection chip 313.

[0038] like Figure 3 As shown, the anti-reflection component 41 can be arranged in the light path between the display screen 11 and the fingerprint camera module 31. The anti-reflection component 41 can include at least one lens, and the lenses in the anti-reflection component 41 are all concave lenses 411. The concave lens 411 can play a certain divergent role for the light, thereby increasing the emission angle of the light in the direction from the fingerprint camera module 31 to the display screen 11. That is, the field of view of the optical fingerprint recognition module can be improved. Figure 3 In FIG. 4 , the dotted line indicates the viewing angle range of the optical fingerprint recognition module when the anti-reflection component 41 is not provided, and the dotted line indicates the viewing angle range of the optical fingerprint recognition module when the anti-reflection component 41 is provided. Figure 3 It can be seen from the angle shown that due to the arrangement of the concave lens 411 in the anti-reflection component 41, the divergence angle of the light is expanded, thereby increasing the field of view angle range of the optical fingerprint recognition module.

[0039] by Figure 3 As shown in the example, the anti-reflection component 41 is formed by a concave lens 411. The concave lens 411 is arranged close to the light incident side of the fingerprint camera module 31 and can be connected to the fingerprint camera module 31. For example, the concave lens 411 can be fixed to the light incident side of the fingerprint camera module 31 by dispensing glue or adhesive bonding. In addition, the anti-reflection component 41 can also be fixedly connected to the middle frame 21, and the connection method includes but is not limited to bonding. Among them, the concave lens 411 covers the field of view of the fingerprint camera module 31 in the plane where it is located.

[0040] Figure 4 FIG. 1 is a schematic diagram of the structure of an optical fingerprint recognition module according to another embodiment. Figure 4As shown, the anti-reflection component 41 is formed by a concave lens 411. The concave lens 411 is arranged close to the display screen 11 and can be connected to the display screen 11. The concave lens 411 covers the field of view of the fingerprint camera module 31 in the plane where it is located.

[0041] Figure 5 FIG. 1 is a schematic diagram of the structure of an optical fingerprint recognition module according to another embodiment. Figure 5 As shown, the anti-reflection component 41 can be composed of two concave lenses 411. One of the concave lenses 411 (recorded as the first lens) is connected to the display screen 11, such as by bonding; the other concave lens 411 (recorded as the second lens) is connected to the light incident side of the fingerprint camera module 31, such as by bonding. The two concave lenses 411 are arranged at intervals. In addition, when fixing the concave lenses 411, each concave lens 411 can be fixedly connected to the middle frame 21 to increase the stability of the connection. Among them, the concave lens 411 connected to the fingerprint camera module 31, that is, the second lens, must cover the field of view angle range of the fingerprint camera module 31. The concave lens 411 in contact with the display screen 11, that is, the first lens, covers the field of view angle range after the combination of the first lens and the fingerprint camera module 31.

[0042] Figure 6 FIG. 1 is a schematic diagram of the structure of an optical fingerprint recognition module according to another embodiment. Figure 6 As shown, the anti-reflection assembly 41 may be composed of three concave lenses 411 in addition to being composed of one concave lens 411 or two concave lenses 411 . Figures 3 to 6 The figure is only an exemplary illustration, and the specific number of concave lenses 411 in the anti-reflection assembly 41 can be set according to the field of view angle that needs to be adjusted. The number of concave lenses 411 in the anti-reflection assembly is not limited here.

[0043] Figures 4 to 6 In FIG. 4 , the dotted line indicates the viewing angle range of the optical fingerprint recognition module when the anti-reflection component 41 is not provided, and the dotted line indicates the viewing angle range of the optical fingerprint recognition module when the anti-reflection component 41 is provided. Figures 4 to 6 It can be seen from the angle shown that due to the arrangement of the concave lens 411 in the anti-reflection component 41, the divergence angle of the light is expanded, thereby increasing the field of view angle range of the optical fingerprint recognition module.

[0044] When setting the anti-reflection component 41, in order to make full use of the space between the display screen 11 and the fingerprint camera module 31, the side surface of the display screen 11 facing the fingerprint camera module can be connected to the anti-reflection component 41, and the anti-reflection component 41 and the fingerprint camera module 31 are spaced apart. As a result, a certain distance can be maintained between the anti-reflection component 41 and the fingerprint camera module 31. In another embodiment, the side surface of the fingerprint camera module 31 facing the display screen 11 can be connected to the anti-reflection component 41, and the anti-reflection component 41 can be spaced apart from the display screen 11 to maintain a certain distance between the anti-reflection component 41 and the display screen 11. This setting method can prevent the anti-reflection component 41 from completely filling the light channel and affecting the assembly of the display screen 11 and the fingerprint camera module 31.

[0045] like Figures 3 to 6 As shown, each concave lens 411 in the anti-reflection component 41 can be a single-sided concave lens or a double-sided concave lens. The single-sided concave lens can help the concave lens and the display screen 11 to fit together. The double-sided concave lens can be more conducive to the divergence of light. When used specifically, it can be selected and designed according to the specific parameters of the optical fingerprint recognition module, and no specific limitation is made here.

[0046] Figure 7 Schematic diagram of the structure of a concave lens according to an embodiment. Figure 8 FIG. 2 is a schematic diagram of the structure of a concave lens in another embodiment. Figure 7 and Figure 8 As shown, in the antireflection assembly, at least one side surface of each concave lens 411 may be provided with a concave-convex structure 412, and the concave-convex structure 412 may be a wavy structure. The surface of the concave lens 411 may be provided as a wavy surface, for example. Each concave lens 411 may have one wavy surface or two wavy surfaces.

[0047] In addition to being a wavy structure, the concave-convex structure 412 can also be a Fresnel ring. In the anti-reflection assembly, at least one side surface of each concave lens can be provided with a Fresnel ring. For example, each concave lens can have a Fresnel ring on one surface, or both surfaces can have a Fresnel ring at the same time. By providing a wavy surface or a Fresnel ring, the area of ​​light received by each concave lens can be increased, and the intensity of the received light can be increased.

[0048] Fig. 9 This is a schematic diagram of the structure of an optical fingerprint recognition module according to an embodiment of the present application. Fig.10 Schematic diagram of the structure of an existing optical fingerprint recognition module. Fig. 9 The antireflection component in the embodiment only contains one concave lens 411, which is a double-sided concave lens. The maximum thickness is 1.3 mm, the minimum thickness is 0.5 mm, the curvature R is 0.05 mm, and the radius is 4 mm.

[0049] test Fig. 9 and Fig.10 The field of view angle of the optical fingerprint recognition module of the structure shown and the size of the field of view diameter of the display surface, and the test results are as follows. Fig. 9 In the optical fingerprint recognition module with an anti-reflection component shown, the field of view angle is 68.01° and the field of view diameter is 8.5544 mm. Fig.10 In the optical fingerprint recognition module shown without an anti-reflection component, the field of view angle is 57.88° and the field of view diameter is 7.6432 mm.

[0050] The optical fingerprint recognition module of the embodiment of the present application can be combined with a display screen to make full use of the space in the thickness direction of the electronic device without increasing the size or modifying the structure of the fingerprint camera module. A simple transformation based on the existing fingerprint recognition module can achieve wide-angle recognition. In addition, the Fresnel rings are arranged in each concave lens of the anti-reflection component to greatly improve the viewing angle of the optical fingerprint recognition module. The anti-reflection component can be formed by assembling multiple groups of concave lenses, which can be assembled separately or assembled in a bonded manner. It can be fixed below the display screen or above the fingerprint camera module by means of adhesive or dispensing. The setting method is flexible and free, and it is convenient to set up and install.

[0051] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An optical fingerprint recognition module, characterized in that: include: Display screen; A fingerprint camera module is arranged at a distance from the display screen in the thickness direction of the display screen, and an optical path for collecting fingerprints is formed between the display screen and the fingerprint camera module; The anti-reflection component is arranged in the light path, and the anti-reflection component includes at least one lens, and each lens in the anti-reflection component is a concave lens.

2. The optical fingerprint recognition module according to claim 1, characterized in that: The antireflection component is formed by a concave lens, and the concave lens is a single-sided concave lens or a double-sided concave lens.

3. The optical fingerprint recognition module according to claim 1, characterized in that: The anti-reflection assembly includes at least two concave lenses, and the at least two concave lenses are spaced or bonded to each other.

4. The optical fingerprint recognition module according to any one of claims 1 to 3, characterized in that: The anti-reflection component is bonded to the display screen.

5. The optical fingerprint recognition module according to any one of claims 1 to 3, characterized in that: The anti-reflection component is bonded to the fingerprint camera module.

6. The optical fingerprint recognition module according to any one of claims 1 to 5, characterized in that: At least one side surface of each concave lens is provided with a concave-convex structure for increasing the light transmission area of ​​the concave lens.

7. The optical fingerprint recognition module according to claim 6, characterized in that: The concave-convex structure is a wave-shaped structure.

8. The optical fingerprint recognition module according to claim 6, characterized in that: The concave-convex structure is a Fresnel ring.

9. The optical fingerprint recognition module according to any one of claims 1 to 8, characterized in that: The field of view angle of the optical fingerprint recognition module is 65-75°.

10. An electronic device, characterized in that: It comprises the optical fingerprint recognition module as described in any one of claims 1-9.

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