Biometric feature recognition optical system including light emitting surface, light source assembly and manufacturing method

Abstract

The present disclosure provides a biometric feature recognition optical system including a light emitting surface, including: a light source assembly, the light source assembly is configured to emit light when contacting a biometric feature, the light source assembly includes an optical element, the optical element is a condenser lens with at least one side being a curved surface that is optically designed and the contact surface having a light emitting function; an optical lens, the optical lens can receive the light emitted by the light source assembly; and an image sensor, the optical lens projects the received light onto the image sensor, and the image sensor is arranged on the projection surface of the optical lens to collect an image of the biometric feature. The present disclosure also provides a light source assembly and a manufacturing method.

Description

Technical Field

[0001] The present disclosure belongs to the field of fingerprint recognition technology, and in particular relates to a biometric feature recognition optical system including a light-emitting surface, a light source component, and a manufacturing method. Background Art

[0002] Biometrics through fingerprint recognition is not only convenient, but also excellent in security and economy, and is widely used in attendance management / access control.

[0003] As a device for fingerprint input, there are methods using a semiconductor sensor and an optical sensor. The semiconductor sensor is small and thin, but has a disadvantage that it is difficult to manufacture in a large area due to its low durability and high cost.

[0004] The semiconductor sensor is a principle obtained by utilizing the electrical characteristics of human skin, and measures the capacitance between the finger and the sensing electrode to form an image of it. Therefore, if the skin is very dry, the cortex is thickened, or other foreign matter is stuck, the image quality will be greatly reduced.

[0005] Optical sensors are used in a wide range of applications, from registration to authentication equipment, due to their superior image clarity and low production cost.

[0006] Optical fingerprint sensors use the principles of light reflection, absorption and scattering, and can be divided into bright background collectors and dark background collectors according to this method: 1. The dark background fingerprint collector uses the principle of diffuse reflection. The ridges of the fingerprint are in close contact with the collection prism, and the light beam irradiated on the ridges is diffusely reflected. The lens group images the light diffusely reflected from the contact part of the fingerprint ridges onto the imaging device, which is displayed as a bright line. The valley line does not contact, and the light still transmits through the collection prism, so the valley line is displayed as a dark line on the imaging device, thereby obtaining an image of a dark background. 2. The bright background fingerprint collector uses the principle of total reflection. The ridges of the fingerprint are in close contact with the collection prism, which destroys the total reflection condition. Part of the incident light is absorbed by the finger, and the remaining part of the light is diffusely reflected. The lens group images the reflected light beam onto the imaging device. The ridges absorb part of the total reflected light and are displayed as dark lines; the valley lines do not contact the collection surface, and total reflection still exists, which is displayed as bright lines, thereby forming a fingerprint image of a bright background.

[0007] However, it requires a high level of lighting design to illuminate uniform lighting, and must effectively block external light and internal reflections that interfere with it, and is sensitive to the surrounding environment (such as direct light and incident light). The problem is that the difficulty of optical design increases and camera control becomes complicated.

[0008] In order to overcome the shortcomings of existing optical sensors and semiconductor sensors, various technologies such as direct photography and ultrasonic methods have been developed, but they have not yet been widely used due to their low availability or high prices.

[0009] In order to make the lighting more uniform, optical and circuit layout design must be carried out. However, optical and circuit layout design requires a lot of time and effort to develop, and the corresponding product structure also needs to be specially designed, which will increase product development time and cost.

[0010] For example, Chinese patent CN101656299B discloses a contact light-emitting element, a manufacturing method thereof, and a fingerprint recognition device, which use a contact light-emitting element. The principle is that when the finger and palm contact the light-emitting element, an alternating current flows through the finger and palm prints to generate an electric field, thereby generating an image of the finger and palm prints according to the contact surface of the finger and palm prints. The emitted light is received by the image sensor and then converted into a photoelectric signal to achieve the functions of collection and recognition. The core of this Chinese patent is the method and structure for making such a contact light-emitting element. Moreover, in order to maintain stability in the product, the contact light-emitting element needs to use a transparent support of the same size as the contact light-emitting element, and a transparent adhesive must be used to bond the transparent support and the contact light-emitting element together for use. Not only will the manufacturing cost increase, but the emitted light will also undergo multiple refractions and scatterings, and the efficiency and uniformity of the light will also decrease. Summary of the invention

[0011] In order to solve at least one of the above technical problems, the present disclosure provides a biometric feature recognition optical system including a light emitting surface, a light source assembly and a manufacturing method.

[0012] The biometric feature recognition optical system including a light-emitting surface, a light source assembly and a manufacturing method disclosed in the present invention are implemented through the following technical solutions.

[0013] According to one aspect of the present disclosure, there is provided a biometric feature recognition optical system including a light emitting surface, comprising: a light source assembly, the light source assembly being configured to emit light when contacting a biometric feature, the light source assembly comprising an optical element, the optical element being a focusing lens having at least one side being a curved surface that is optically designed and the contact surface having a light emitting function; an optical lens, the optical lens being capable of receiving the light emitted by the light source assembly; and an image sensor, the optical lens projects the received light onto the image sensor, the image sensor being disposed on a projection surface of the optical lens to capture an image of the biometric feature.

[0014] According to at least one embodiment of the biometric feature recognition optical system including a light emitting surface of the present disclosure, the light emitting surface of the optical element is a curved surface.

[0015] According to at least one embodiment of the biometric feature recognition optical system including a light-emitting surface of the present disclosure, the light source component also includes a transparent semiconductor film layer, a light-emitting layer, a black coating layer and a protective layer; the transparent semiconductor film layer is arranged on the light incident surface of the optical element, the light-emitting layer is arranged on the transparent semiconductor film layer, the black coating layer is arranged on the light-emitting layer, and the protective layer is arranged on the black coating layer.

[0016] According to at least one embodiment of the present disclosure, the biometric feature recognition optical system including the light emitting surface further includes a control unit, which processes the image of the biometric feature collected by the image sensor and provides alternating current to the light source assembly.

[0017] According to at least one embodiment of the present disclosure, the biometric feature recognition optical system including a light-emitting surface also includes a shell, and the light source assembly, the optical lens, the image sensor and the control unit are all arranged inside the shell, and the shell has a collection window, through which the image of the biometric feature is collected.

[0018] According to the biometric feature recognition optical system including a light-emitting surface of at least one embodiment of the present disclosure, the biometric feature is a palm print or a fingerprint.

[0019] According to at least one embodiment of the biometric feature recognition optical system including a light-emitting surface of the present disclosure, the transparent semiconductor thin film layer is an ITO thin film layer.

[0020] According to at least one embodiment of the biometric feature recognition optical system including a light-emitting surface of the present disclosure, the light incident surface of the optical element includes a curved surface, and accordingly, the transparent semiconductor film layer, the light-emitting layer, the black coating layer and the protective layer all include curved surfaces to match the curved surface of the light incident surface of the optical element.

[0021] According to another aspect of the present disclosure, a light source assembly is provided, which is configured to emit light when contacting a biometric feature, and includes: an optical element, which is a focusing lens with at least one side being a curved surface and optically designed; a transparent semiconductor film layer, which is disposed on a light incident surface of the optical element; a light-emitting layer, which is disposed on the transparent semiconductor film layer; a black coating layer, which is disposed on the light-emitting layer; and a protective layer, which is disposed on the black coating layer. When the transparent semiconductor film layer is energized and the biometric feature contacts the light source assembly through the protective layer, the light-emitting layer responds to the contact and emits light, and the light is emitted through a light exit surface of the optical element.

[0022] According to the light source assembly of at least one embodiment of the present disclosure, the light incident surface of the optical element includes a curved surface, and accordingly, the transparent semiconductor film layer, the light-emitting layer, the black coating layer and the protective layer all include curved surfaces to match the curved surface of the light incident surface of the optical element.

[0023] According to the light source assembly of at least one embodiment of the present disclosure, the transparent semiconductor thin film layer is an ITO thin film layer.

[0024] According to another aspect of the present disclosure, a method for manufacturing any of the above-mentioned light source components is provided, comprising: setting at least one side of an optical element as a curved surface, so that the optical element becomes an optically designed focusing lens with at least one side being a curved surface; forming a transparent semiconductor thin film layer on the surface of the optical element opposite to the curved surface; forming a light-emitting layer on the transparent semiconductor thin film layer; forming a black coating layer on the light-emitting layer; and forming a protective layer on the black coating layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings illustrate exemplary embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0026] Figure 1 It is a schematic structural diagram of a biometric feature recognition optical system including a light-emitting surface according to an embodiment of the present disclosure.

[0027] Figure 2 It is a schematic structural diagram of a light source assembly of a biometric feature recognition optical system including a light emitting surface according to an embodiment of the present disclosure.

[0028] Figure 3 It is a schematic diagram of a light source assembly with a planar contact surface according to an embodiment of the present disclosure being touched by a finger.

[0029] Figure 4 It is a schematic diagram of a light source assembly with a curved contact surface according to an embodiment of the present disclosure being touched by a finger.

[0030] Figure 5 This is a schematic diagram of the principle of electroluminescence.

[0031] Figure 6 It is a schematic structural diagram of a biometric feature recognition optical system including a light-emitting surface according to another embodiment of the present disclosure.

[0032] Description of Reference Numerals

[0033] 100Biometric feature recognition optical system including a light emitting surface

[0034] 101 Light Source Components

[0035] 1011 Optical Components

[0036] 1012 Transparent semiconductor thin film layer

[0037] 1013 Luminous Layer

[0038] 1014 Black layer

[0039] 1015 protective layer

[0040] 102 Optical lens

[0041] 103 Image Sensor

[0042] 104 control unit

[0043] 105 shell. DETAILED DESCRIPTION

[0044] The present disclosure is further described in detail below in conjunction with the accompanying drawings and implementations. It is understood that the specific implementations described herein are only used to explain the relevant content, rather than to limit the present disclosure. It should also be noted that, for ease of description, only the parts related to the present disclosure are shown in the accompanying drawings.

[0045] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in the present disclosure can be combined with each other. The technical solution of the present disclosure will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0046] Unless otherwise specified, the exemplary embodiments / embodiments shown will be understood as providing exemplary features of various details of some ways in which the technical concept of the present disclosure can be implemented in practice. Therefore, unless otherwise specified, the features of the various embodiments / embodiments can be combined, separated, interchanged and / or rearranged without departing from the technical concept of the present disclosure.

[0047] The use of cross-hatching and / or shading in the accompanying drawings is generally used to make the boundaries between adjacent components clear. As such, unless otherwise specified, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for the specific materials, material properties, dimensions, proportions, commonalities between the components shown, and / or any other characteristics, attributes, properties, etc. of the components. In addition, in the accompanying drawings, the sizes and relative sizes of the components may be exaggerated for clarity and / or descriptive purposes. When the exemplary embodiments can be implemented differently, the specific process sequence can be performed in a different order than described. For example, two successively described processes can be performed substantially simultaneously or in an order opposite to the described order. In addition, the same figure numbers represent the same components.

[0048] When a component is referred to as being "on" or "over," "connected to," or "coupled to" another component, the component may be directly on, directly connected to, or directly coupled to the other component, or intervening components may be present. However, when a component is referred to as being "directly on," "directly connected to," or "directly coupled to" another component, there are no intervening components. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, etc., with or without intervening components.

[0049] For descriptive purposes, the present disclosure may use spatially relative terms such as "under," "beneath," "under," "down," "over," "upper," "above," "higher," and "side (e.g., in a "sidewall")," to describe the relationship of one component to another (other) component as shown in the accompanying drawings. The spatially relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, components described as "under" or "beneath" other components or features would subsequently be positioned "over" the other components or features. Thus, the exemplary term "under" can encompass both the "above" and "below" orientations. Furthermore, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0050] The terms used here are for the purpose of describing specific embodiments, and are not intended to be restrictive. As used here, unless the context clearly indicates otherwise, the singular forms "one (kind, person)" and "said (the)" are also intended to include plural forms. In addition, when the terms "comprise" and / or "include" and their variations are used in this specification, it is explained that there are stated features, integral bodies, steps, operations, parts, assemblies and / or their groups, but it is not excluded that there are or add one or more other features, integral bodies, steps, operations, parts, assemblies and / or their groups. It should also be noted that, as used here, the terms "substantially", "approximately" and other similar terms are used as approximate terms and not as degree terms, so that they are used to explain the inherent deviations of the measured values, calculated values ​​and / or the values ​​provided that will be recognized by those of ordinary skill in the art.

[0051] Figure 1 is a schematic structural diagram of a biometric feature recognition optical system 100 including a light-emitting surface according to an embodiment of the present disclosure.

[0052] like Figure 1As shown, the biometric feature recognition optical system 100 including a light-emitting surface includes: a light source component 101, the light source component 101 is configured to emit light when contacting a biometric feature, the light source component 101 includes an optical element, the optical element is a focusing lens with at least one side being a curved surface that is optically designed and the contact surface having a light-emitting function; an optical lens 102, the optical lens 102 can receive the light emitted by the light source component 101; and an image sensor 103, the optical lens 102 projects the received light onto the image sensor 103, and the image sensor 103 is arranged on the projection surface of the optical lens 102 to capture an image of the biometric feature.

[0053] The curved surface described above may be a spherical surface or a part of a spherical surface, or may be an ellipsoidal surface or a part of an ellipsoidal surface.

[0054] The light source assembly 101 is configured to emit light based on the contacted object part (biological feature).

[0055] The optical lens 102 can be a combination of multiple optical lenses.

[0056] The image sensor 103 is used to capture image information and convert the captured image information into photoelectric signals.

[0057] The biometric feature described above may be a palm print or a fingerprint.

[0058] Preferably, when the light source assembly 101 is powered on and the biometric feature contacts the light source assembly 101 through the contact surface of the light source assembly 101 , the light source assembly 101 responds to the contact and emits light, and the light is emitted through the light emitting surface of the light source assembly 101 .

[0059] Figure 5 This is a schematic diagram of the electroluminescence principle. Figure 5 The light emitting principle of the light source assembly is explained.

[0060] like Figure 5 As shown in the above figure, when a transparent electrode layer is provided above and below the light-emitting layer of the light-emitting component, an alternating current is applied to both ends of the transparent electrode layer, and the light-emitting layer is excited to emit light. Figure 5 The arrow in the figure above is the direction of the electric field.

[0061] Applying this principle to biometric identification (such as fingerprint identification) requires structural modification, that is, removing the transparent electrode layer at one end of the light-emitting layer and achieving alternating current flow through finger contact (i.e. fingerprint contact), such as Figure 5 As shown in the figure below, when an alternating current flows through the part of the light-emitting component that is in contact with the fingerprint (exemplarily represented by three small ellipses), the part of the light-emitting layer corresponding to the part of the light-emitting component that is in contact with the fingerprint will be excited to emit light.

[0062] In order to ensure image quality and product durability, as well as to prevent external light from entering the light-emitting component and absorb internal light, a black coating layer ( Figure 5 More preferably, a protective layer is provided on the surface of the black coating layer.

[0063] According to a preferred embodiment of the present disclosure, Figure 1 As shown, the biometric feature recognition optical system 100 including a light emitting surface includes a light source assembly 101, which is configured to emit light when in contact with a biometric feature; an optical lens 102, which is capable of receiving the light emitted by the light source assembly 101; an image sensor 103, which projects the received light onto the image sensor 103, and the image sensor 103 is arranged on the projection surface of the optical lens 102 to capture an image of the biometric feature; and a control unit 104, which processes the image of the biometric feature captured by the image sensor 103 and provides alternating current to the light source assembly 101.

[0064] The control unit 104 can realize the following functions: provide alternating current to the light source assembly 101 and receive and process the electrical signal from the image sensor 103 to generate an image based on the texture of the surface of the contact object.

[0065] Figure 2 1 is a schematic structural diagram of a light source assembly 101 of a biometric feature recognition optical system 100 including a light emitting surface according to an embodiment of the present disclosure.

[0066] The light source assembly 101 in the above embodiment preferably has Figure 2 The structure shown.

[0067] like Figure 2 As shown, according to a preferred embodiment of the present disclosure, the light source assembly 101 of the biometric feature recognition optical system 100 including a light emitting surface includes an optical element 1011, and the light emitting surface of the optical element 1011 is a curved surface. That is, the light emitting surface ( Figure 1 , Figure 2 A focusing lens is formed on the lower surface of the optical element 1011.

[0068] like Figure 2As shown, according to a preferred embodiment of the present disclosure, the light source assembly 101 of the biometric feature recognition optical system 100 including a light-emitting surface further includes a transparent semiconductor film layer 1012, a light-emitting layer 1013, a black coating layer 1014 and a protective layer 1015; the transparent semiconductor film layer 1012 is arranged on the light incident surface of the optical element 1011, the light-emitting layer 1013 is arranged on the transparent semiconductor film layer 1012, the black coating layer 1014 is arranged on the light-emitting layer 1013, and the protective layer 1015 is arranged on the black coating layer 1014.

[0069] Preferably, the transparent semiconductor thin film layer 1012 is an ITO thin film layer.

[0070] The manufacturing of the light source assembly 101 described above can be achieved in the following manner:

[0071] 1. An optical element, at least one side of which is a condenser lens with an optically designed curved surface;

[0072] 2. A transparent semiconductor thin film layer (such as an ITO thin film layer) is evaporated on the surface of the optical element;

[0073] 3. The light-emitting layer is screen-printed on the transparent semiconductor film layer;

[0074] 4. Apply the black layer and spray it on the luminous layer;

[0075] 5. Protective layer, sprayed on the black coating layer.

[0076] The light-emitting layer is located on the surface of the ITO film layer, and is configured to generate an electric field and emit light by supplying alternating current to the ITO film layer through the object after the object contacts it, and can generate a light pattern based on the texture on the surface of the contacted object; the black coating layer is located on the surface of the light-emitting layer, and is configured to block external light and absorb internal light; the protective layer is located on the surface of the black coating layer, and is configured to be waterproof and scratch-resistant.

[0077] Figure 6 It is a schematic structural diagram of a biometric feature recognition optical system 100 including a light-emitting surface according to another embodiment of the present disclosure.

[0078] like Figure 6 As shown, in Figure 1 Based on the biometric feature recognition optical system 100 including a light-emitting surface shown, the biometric feature recognition optical system 100 including a light-emitting surface also includes a shell 105, and the light source assembly 101, the optical lens 102, the image sensor 103 and the control unit 104 are all arranged in the shell 105, and the shell 105 has a collection window, through which the image of the biometric feature such as a fingerprint is collected.

[0079] Preferably, the collection window is arranged on the upper end surface of the housing 105, the surface of the housing 105 is surface treated and configured to have excellent conductive function, the light source assembly 101 in the biometric feature recognition optical system 100 including the light emitting surface is arranged below the collection window of the housing 105, and the control unit 104 in the biometric feature recognition optical system 100 including the light emitting surface is connected to the housing 105. When a finger is placed on the surface of the light source assembly 101 and in contact with the housing 105, the light emitting layer 1013 of the light source assembly 101 flows through the alternating current to emit light based on the fingerprint of the finger, which is converged by the focusing lens 1011 and reaches the optical lens 102 below to be projected on the image sensor 103, and the control unit 104 receives the electrical signal from the image sensor 103 and outputs the fingerprint image.

[0080] According to one embodiment of the present disclosure, Figure 3 As shown, the optical element 1011 in the optical assembly 101 of each embodiment described above has a light incident surface ( Figure 1 , Figure 2 , Figure 6 The upper surface in ( ) is a plane, Figure 3 A schematic diagram is shown when the light source assembly 101 with a planar contact surface is touched by a finger.

[0081] According to a preferred embodiment of the present disclosure, for the optical element 1011 in the optical assembly 101 of each embodiment described above, its light incident surface ( Figure 1 , Figure 2 , Figure 6 The upper surface in the optical element 1011 includes a curved surface. Accordingly, the transparent semiconductor film layer 1012, the light-emitting layer 1013, the black coating layer 1014 and the protective layer 1015 all include curved surfaces to match the curved surface of the light incident surface of the optical element 1011. Figure 4 A schematic diagram is shown when the light source assembly 101 with a curved contact surface is touched by a finger.

[0082] The light incident surface, ie, the light emitting surface, of the optical element 1011 is processed according to the curvature of the finger, thereby improving the accuracy of collecting biometric features such as fingerprints.

[0083] According to another embodiment of the present disclosure, Figure 2As shown, a light source assembly 101 is provided, and the light source assembly 101 is configured to emit light when contacting a biometric feature, and includes: an optical element 1011, and a light emitting surface of the optical element 1011 is a curved surface; a transparent semiconductor film layer 1012, and the transparent semiconductor film layer 1012 is arranged on the light incident surface of the optical element 1011, and a light emitting layer 1013, and the light emitting layer 1013 is arranged on the transparent semiconductor film layer 1012; a black coating layer 1014, and the black coating layer 1014 is arranged on the light emitting layer 1013; and a protective layer 1015, and the protective layer 1015 is arranged on the black coating layer 1014. When the transparent semiconductor film layer 1012 is energized and the biometric feature contacts the light source assembly through the protective layer 1015, the light emitting layer 1013 responds to the contact and emits light, and the light is emitted through the light emitting surface of the optical element 1011.

[0084] Preferably, the light incident surface of the optical element 1011 of the light source assembly 101 includes a curved surface, and accordingly, the transparent semiconductor film layer 1012 , the light emitting layer 1013 , the black coating layer 1014 and the protective layer 1015 all include curved surfaces to match the curved surface of the light incident surface of the optical element 1011 .

[0085] Preferably, the transparent semiconductor thin film layer 1012 is an ITO thin film layer.

[0086] The technical solution disclosed in the present invention can realize direct ITO coating on optical elements, and sequentially print the light-emitting layer, the black coating layer and the protective layer, so as to eliminate the interference of external light and internal light, and directly emit light based on the surface texture of the contact object on the optical element, thereby reducing the lighting design and reducing the cost. The use of optical elements with light-emitting surfaces reduces the impact of reduced image quality caused by dry skin, thickened cortex or other foreign matter.

[0087] The technical solution disclosed in the present invention overcomes the process difficulties that cannot be overcome in the existing patented technologies, reduces the cost and improves the image quality. The technical solution disclosed in the present invention reduces the thickness and size of the product.

[0088] In the above-described embodiments of the present disclosure, the optical system including the light emitting surface maximizes the convenience of the user by designing various types of fingerprint contact surfaces (such as flat surfaces and curved surfaces).

[0089] In the description of this specification, the description with reference to the terms "one embodiment / method", "some embodiments / methods", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment / method or example are included in at least one embodiment / method or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment / method or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments / methods or examples. In addition, those skilled in the art may combine and combine the different embodiments / methods or examples described in this specification and the features of the different embodiments / methods or examples, unless they are contradictory.

[0090] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present disclosure, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0091] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present disclosure, and are not intended to limit the scope of the present disclosure. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present disclosure.

Claims

1. A biometric feature recognition optical system comprising a light emitting surface, characterized in that: include: A light source assembly, wherein the light source assembly is configured to emit light when contacting a biometric feature, the light source assembly comprises an optical element, a transparent semiconductor film layer, a light-emitting layer, a black coating layer and a protective layer, the optical element is a focusing lens having at least one side thereof being a curved surface with an optical design and a contact surface having a light-emitting function, the transparent semiconductor film layer is arranged on a light incident surface of the optical element, the light-emitting layer is arranged on the transparent semiconductor film layer, the black coating layer is arranged on the light-emitting layer, and the protective layer is arranged on the black coating layer, and when the transparent semiconductor film layer is energized and the biometric feature contacts the light source assembly through the protective layer, the light-emitting layer responds to the contact and emits light, and the light is emitted through a light exit surface of the optical element; An optical lens, wherein the optical lens is capable of receiving the light emitted by the light source assembly; as well as An image sensor, wherein the optical lens projects the received light onto the image sensor, and the image sensor is arranged on a projection surface of the optical lens to collect an image of the biometric feature.

2. The biometric feature recognition optical system comprising a light emitting surface according to claim 1, characterized in that: The light emitting surface of the optical element is a curved surface.

3. The biometric feature recognition optical system comprising a light emitting surface according to claim 1, characterized in that: The light incident surface of the optical element includes a curved surface. Accordingly, the transparent semiconductor film layer, the light emitting layer, the black coating layer and the protective layer all include curved surfaces to match the curved surface of the light incident surface of the optical element.

4. The biometric feature recognition optical system comprising a light emitting surface according to any one of claims 1 to 3, characterized in that: It also includes a control unit, which processes the image of the biological feature collected by the image sensor and provides alternating current to the light source assembly.

5. The biometric feature recognition optical system comprising a light emitting surface according to claim 4, characterized in that: It also includes a shell, the light source assembly, the optical lens, the image sensor and the control unit are all arranged inside the shell, and the shell has a collection window, through which the image of the biological feature is collected.

6. The biometric feature recognition optical system comprising a light emitting surface according to claim 1, characterized in that: The biometric feature is a palm print or a fingerprint.

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