CN115641618B - Fingerprint sensor and electronic equipment - Google Patents
Fingerprint sensor and electronic equipment Download PDFInfo
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- CN115641618B CN115641618B CN202111433636.1A CN202111433636A CN115641618B CN 115641618 B CN115641618 B CN 115641618B CN 202111433636 A CN202111433636 A CN 202111433636A CN 115641618 B CN115641618 B CN 115641618B
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Abstract
The embodiment of the application provides a fingerprint sensor and electronic equipment. The fingerprint sensor comprises a light emitting component, a magnetic film, a magneto-optical medium layer, an analyzer and an image sensor. The light exit assembly is configured to emit linearly polarized light. The magnetic film is arranged on one side of the light emitting component. The surface of the magnetic film facing away from the light emitting component is a fingerprint receiving area. The magneto-optical medium layer is arranged on the other side of the light emitting component. The magnetic thin film is arranged opposite to the magneto-optical medium layer. The magneto-optical medium layer is located in the magnetic field generated by the magnetic film. The magneto-optical medium layer is configured to receive linearly polarized light and rotate the linearly polarized light. The analyzer is arranged on one side of the magneto-optical medium layer, which is opposite to the light emitting component. The analyzer has a first polarization direction that allows light to pass therethrough. The vibration direction of the linearly polarized light intersects the first polarization direction. The image sensor is arranged on one side of the analyzer, which is away from the magneto-optical medium layer. The image sensor is configured to receive the linearly polarized light exiting the analyzer. The fingerprint sensor can effectively improve fingerprint identification accuracy.
Description
Technical Field
The embodiment of the application relates to the technical field of terminals, in particular to a fingerprint sensor and electronic equipment.
Background
With the explosive growth of electronic devices such as smart phones or tablet computers (portable equipment, PAD), the functions of the electronic devices are increasing. With the increase of the security awareness of users on information data, more and more electronic devices increase different encryption modes. For example, the distal abdomen of a human finger has a fingerprint formed by rugged skin. The fingerprint lines of each person are different in pattern, break points and cross points, so that the fingerprint has uniqueness and stability. As the fingerprint features of the human body have the characteristics of uniqueness and stability, along with the development of technology, more and more electronic devices adopt a fingerprint identification technology to unlock or encrypt the electronic devices, so that the security of personal information in the use process of the electronic devices is effectively improved.
Currently, the fingerprint identification technology adopted on electronic equipment is an optical fingerprint identification technology. In performing a correlation operation by means of a fingerprint, a finger is placed in a fingerprint contact area, and a fingerprint image is formed on an image sensor by refraction and reflection of light. And comparing the acquired fingerprint image with a fingerprint image which is firstly recorded in the electronic equipment, and finally, carrying out identification judgment. However, when the finger of the user is in a wet state, the finger of the user cannot be identified by the optical fingerprint identification system, so that the optical fingerprint identification is invalid, and the use convenience and experience of the electronic equipment are affected.
Disclosure of Invention
The embodiment of the application provides a fingerprint sensor and electronic equipment, which can effectively improve the identification accuracy of the fingerprint sensor, reduce the possibility of fingerprint identification failure and improve the use convenience and experience of the electronic equipment.
The first aspect of the application provides a fingerprint sensor, which at least comprises a light emitting component, a magnetic film, a magneto-optical medium layer, an analyzer and an image sensor. The light exit assembly is configured to emit linearly polarized light. The magnetic film is arranged on one side of the light emitting component. The surface of the magnetic film facing away from the light emitting component is a fingerprint receiving area. The magneto-optical medium layer is arranged on the other side of the light emitting component. The magnetic thin film is arranged opposite to the magneto-optical medium layer. The magneto-optical medium layer is located in the magnetic field generated by the magnetic film. The magneto-optical medium layer is configured to receive linearly polarized light and rotate the linearly polarized light. The analyzer is arranged on one side of the magneto-optical medium layer, which is opposite to the light emitting component. The analyzer has a first polarization direction that allows light to pass therethrough. The vibration direction of the linearly polarized light intersects the first polarization direction. The image sensor is arranged on one side of the analyzer, which is away from the magneto-optical medium layer. The image sensor is configured to receive the linearly polarized light exiting the analyzer.
According to the fingerprint sensor provided by the embodiment of the application, when the fingerprint of a user does not press the magnetic film, the light intensity of linearly polarized light passing through the magneto-optical medium layer and the analyzer is not changed, so that an image on the image sensor is not changed. When the fingerprint of a user presses the magnetic film, the magnetic induction intensity of the magnetic field generated by the magnetic film is correspondingly changed, so that the light intensity of linearly polarized light which passes through the magneto-optical medium layer and the analyzer and is emitted is changed in the area corresponding to the fingerprint, the light intensity received by the image sensor is changed, and the image on the image sensor is changed and the corresponding fingerprint contour is imaged. And then, the fingerprint contours are identified and compared to realize that the electronic equipment executes corresponding instructions.
When the fingerprint of the user is in a wet state and contacts with the magnetic film, the skin of the user and the magnetic film can jointly squeeze the liquid to enable the liquid to flow to other areas, so that the thickness of the areas, corresponding to the protrusions and the recesses of the fingerprint, of the magnetic film can change, the magnetic induction intensity can still change, and the magnetic induction intensity cannot be influenced by the liquid. Therefore, the fingerprint sensor can still accurately acquire fingerprint data, so that the recognition accuracy of the fingerprint sensor is effectively improved, the possibility of fingerprint recognition failure is reduced, and the use convenience and experience of the electronic equipment are improved.
In one possible embodiment, the light emitting assembly comprises a light emitting unit and a polarizer. The polarizer is disposed between the light emitting unit and the magneto-optical medium layer. The polarizer is configured to convert light emitted from the light emitting unit into linearly polarized light. The polarizer has a second polarization direction that allows light to pass therethrough. The first polarization direction intersects the second polarization direction. In an initial state where the fingerprint sensor is not in contact with the fingerprint, linearly polarized light emitted from the polarizer passes through the magneto-optical medium layer and the analyzer, and then a part of the linearly polarized light can pass through the analyzer, so that the receiving surface of the image sensor presents a predetermined brightness.
In one possible embodiment, the light extraction assembly comprises a light guiding layer and a polarizer. The polarizer is disposed between the light guide layer and the magneto-optical medium layer. The polarizer is configured to convert light rays exiting the light guide layer into linearly polarized light. The polarizer has a second polarization direction that allows light to pass therethrough. The first polarization direction intersects the second polarization direction. In the fingerprint sensor, the magnetic film, the light guide layer, the polarizer, the magneto-optical medium layer and the analyzer do not need to input or output electric signals, so that corresponding circuit modules are not required to be additionally arranged, the whole circuit module of the fingerprint sensor is simple in design, and the fingerprint sensor is simple in whole structure.
In one possible embodiment, the angle between the first polarization direction and the second polarization direction is in the range of 70 ° to 80 °.
In one possible embodiment, the polarizer is provided directly on the surface of the magneto-optical medium layer facing the magnetic thin film. Other connecting pieces are not additionally arranged between the polarizer and the magneto-optical medium layer, so that on one hand, linearly polarized light emitted from the polarizer can directly enter the magneto-optical medium layer, the attenuation rate of the linearly polarized light is reduced, and meanwhile, the possibility that the linearly polarized light is refracted or reflected in the additionally arranged connecting pieces to interfere the linearly polarized light is reduced; on the other hand, the overall thickness of the polarizer and the magneto-optical medium layer can be reduced, so that the magnetic field of the magnetic film can be effectively acted on the magneto-optical medium layer, and the possibility that the magnetic induction intensity at the magneto-optical medium layer is weak and the linearly polarized light in the magneto-optical medium layer cannot be rotated or the rotation angle does not reach a preset angle due to the fact that the overall thickness of the polarizer and the magneto-optical medium layer is large is reduced; in still another aspect, the thickness of the whole fingerprint sensor can be reduced, so that the whole fingerprint sensor structure is more compact, and the miniaturization design of the fingerprint sensor can be realized.
In one possible embodiment, the analyzer is disposed directly on the surface of the magneto-optical medium layer facing the image sensor. Other connecting pieces are not additionally arranged between the analyzer and the magneto-optical medium layer, so that linearly polarized light emitted from the magneto-optical medium layer can directly enter the analyzer, the attenuation rate of the linearly polarized light is reduced, and meanwhile the possibility that the linearly polarized light is refracted or reflected in the additionally arranged connecting pieces to interfere the linearly polarized light is reduced.
In one possible embodiment, the polarizer is a polarizer; alternatively, the analyzer is a polarizer. The polarizer or the analyzer has smaller thickness, which is beneficial to reducing the thickness of the whole fingerprint sensor. When the polarizer is a polarizing plate, the possibility of adverse effect on the magnetic field of the magnetic film due to the large thickness of the polarizer can be effectively reduced.
In one possible embodiment, the material of the magneto-optical medium layer is a rare earth garnet crystal, so that the Verdet (Verdet) constant of the magneto-optical medium layer can be made larger, which is beneficial to reducing the thickness of the magneto-optical medium layer.
In one possible implementation, the magnetic film is a nano magnetic liquid film, so that the magnetic film has better flexibility and is easy to deform when the fingerprint of the finger is pressed.
In one possible embodiment, the light extraction assembly includes a light extraction portion. The light-emitting surface is arranged facing the magneto-optical medium layer. The light emitted by the light emitting component propagates towards the magneto-optical medium layer, so that the light emitting quantity of the light emitting component towards the magnetic film is effectively reduced, the possibility that the light emitted by the light emitting component propagates towards the magnetic film to cause the light reflected by the magnetic film or the light reflected by the finger is finally projected onto the image sensor, and further the definition of a fingerprint image and the fingerprint identification precision on the image sensor are affected is reduced.
In one possible implementation, the fingerprint sensor further comprises a light blocking layer. The light isolation layer is arranged between the magnetic film and the light emitting component. The light isolation layer is configured to isolate the light emitting component from the magnetic film, so that on one hand, light rays emitted by the light emitting component can be prevented from being transmitted towards the magnetic film; on the other hand, the external light of the fingerprint sensor can be blocked from entering the magneto-optical medium and the image sensor through the magnetic film, so that the possibility that the definition of a fingerprint image and the fingerprint identification precision are affected due to the fact that the external light is imaged on the image sensor is reduced.
In one possible embodiment, the light-blocking layer is formed on the surface of the light-emitting component facing the magnetic film by a coating process or a coating process, so that the thickness of the light-blocking layer itself is small.
In one possible embodiment, the material of the light-blocking layer is a material having light-absorbing properties. After the light rays emitted by the light emitting component are incident to the light isolating layer, the light isolating layer can absorb the light rays, so that the possibility that the light rays are reflected on the light isolating layer is reduced, and the possibility that the definition of a fingerprint image and the fingerprint identification precision are affected due to the fact that the light rays reflected from the light isolating layer are imaged on the image sensor is reduced.
A second aspect of the present application provides an electronic device, which at least includes the fingerprint sensor described above. The fingerprint sensor at least comprises a light emitting component, a magnetic film, a magneto-optical medium layer, an analyzer and an image sensor. The light exit assembly is configured to emit linearly polarized light. The magnetic film is arranged on one side of the light emitting component. The surface of the magnetic film facing away from the light emitting component is a fingerprint receiving area. The magneto-optical medium layer is arranged on the other side of the light emitting component. The magnetic thin film is arranged opposite to the magneto-optical medium layer. The magneto-optical medium layer is located in the magnetic field generated by the magnetic film. The magneto-optical medium layer is configured to receive linearly polarized light and rotate the linearly polarized light. The analyzer is arranged on one side of the magneto-optical medium layer, which is opposite to the light emitting component. The analyzer has a first polarization direction that allows light to pass therethrough. The vibration direction of the linearly polarized light intersects the first polarization direction. The image sensor is arranged on one side of the analyzer, which is away from the magneto-optical medium layer. The image sensor is configured to receive the linearly polarized light exiting the analyzer.
In one possible embodiment, the light emitting assembly comprises a light emitting unit and a polarizer. The polarizer is disposed between the light emitting unit and the magneto-optical medium layer. The polarizer is configured to convert light emitted from the light emitting unit into linearly polarized light. The polarizer has a second polarization direction that allows light to pass therethrough. The first polarization direction intersects the second polarization direction. In an initial state where the fingerprint sensor is not in contact with the fingerprint, linearly polarized light emitted from the polarizer passes through the magneto-optical medium layer and the analyzer, and then a part of the linearly polarized light can pass through the analyzer, so that the receiving surface of the image sensor presents a predetermined brightness.
In one possible embodiment, the light extraction assembly comprises a light guiding layer and a polarizer. The polarizer is disposed between the light guide layer and the magneto-optical medium layer. The polarizer is configured to convert light rays exiting the light guide layer into linearly polarized light. The polarizer has a second polarization direction that allows light to pass therethrough. The first polarization direction intersects the second polarization direction. In the fingerprint sensor, the magnetic film, the light guide layer, the polarizer, the magneto-optical medium layer and the analyzer do not need to input or output electric signals, so that corresponding circuit modules are not required to be additionally arranged, the whole circuit module of the fingerprint sensor is simple in design, and the fingerprint sensor is simple in whole structure.
In one possible embodiment, the angle between the first polarization direction and the second polarization direction is in the range of 70 ° to 80 °.
In one possible embodiment, the polarizer is provided directly on the surface of the magneto-optical medium layer facing the magnetic thin film. Other connecting pieces are not additionally arranged between the polarizer and the magneto-optical medium layer, so that on one hand, linearly polarized light emitted from the polarizer can directly enter the magneto-optical medium layer, the attenuation rate of the linearly polarized light is reduced, and meanwhile, the possibility that the linearly polarized light is refracted or reflected in the additionally arranged connecting pieces to interfere the linearly polarized light is reduced; on the other hand, the overall thickness of the polarizer and the magneto-optical medium layer can be reduced, so that the magnetic field of the magnetic film can be effectively acted on the magneto-optical medium layer, and the possibility that the magnetic induction intensity at the magneto-optical medium layer is weak and the linearly polarized light in the magneto-optical medium layer cannot be rotated or the rotation angle does not reach a preset angle due to the fact that the overall thickness of the polarizer and the magneto-optical medium layer is large is reduced; in still another aspect, the thickness of the whole fingerprint sensor can be reduced, so that the whole fingerprint sensor structure is more compact, and the miniaturization design of the fingerprint sensor can be realized.
In one possible embodiment, the analyzer is disposed directly on the surface of the magneto-optical medium layer facing the image sensor. Other connecting pieces are not additionally arranged between the analyzer and the magneto-optical medium layer, so that linearly polarized light emitted from the magneto-optical medium layer can directly enter the analyzer, the attenuation rate of the linearly polarized light is reduced, and meanwhile the possibility that the linearly polarized light is refracted or reflected in the additionally arranged connecting pieces to interfere the linearly polarized light is reduced.
In one possible embodiment, the polarizer is a polarizer; alternatively, the analyzer is a polarizer. The polarizer or the analyzer has smaller thickness, which is beneficial to reducing the thickness of the whole fingerprint sensor. When the polarizer is a polarizing plate, the possibility of adverse effect on the magnetic field of the magnetic film due to the large thickness of the polarizer can be effectively reduced.
In one possible embodiment, the thickness of the magneto-optical medium layer is greater than the thickness of the polarizer. The thickness of the magneto-optical medium layer is greater than the thickness of the analyzer.
In one possible embodiment, the material of the magneto-optical medium layer is a rare earth garnet crystal, so that the Verdet (Verdet) constant of the magneto-optical medium layer can be made larger, which is beneficial to reducing the thickness of the magneto-optical medium layer.
In one possible implementation, the magnetic film is a nano magnetic liquid film, so that the magnetic film has better flexibility and is easy to deform when the fingerprint of the finger is pressed.
In one possible embodiment, the light extraction assembly includes a light extraction portion. The light-emitting surface is arranged facing the magneto-optical medium layer. The light emitted by the light emitting component propagates towards the magneto-optical medium layer, so that the light emitting quantity of the light emitting component towards the magnetic film is effectively reduced, the possibility that the light emitted by the light emitting component propagates towards the magnetic film to cause the light reflected by the magnetic film or the light reflected by the finger is finally projected onto the image sensor, and further the definition of a fingerprint image and the fingerprint identification precision on the image sensor are affected is reduced.
In one possible implementation, the fingerprint sensor further comprises a light blocking layer. The light isolation layer is arranged between the magnetic film and the light emitting component. The light isolation layer is configured to isolate the light emitting component from the magnetic film, so that on one hand, light rays emitted by the light emitting component can be prevented from being transmitted towards the magnetic film; on the other hand, the external light of the fingerprint sensor can be blocked from entering the magneto-optical medium and the image sensor through the magnetic film, so that the possibility that the definition of a fingerprint image and the fingerprint identification precision are affected due to the fact that the external light is imaged on the image sensor is reduced.
In one possible embodiment, the light-blocking layer is formed on the surface of the light-emitting component facing the magnetic film by a coating process or a coating process, so that the thickness of the light-blocking layer itself is small.
In one possible embodiment, the material of the light-blocking layer is a material having light-absorbing properties. After the light rays emitted by the light emitting component are incident to the light isolating layer, the light isolating layer can absorb the light rays, so that the possibility that the light rays are reflected on the light isolating layer is reduced, and the possibility that the definition of a fingerprint image and the fingerprint identification precision are affected due to the fact that the light rays reflected from the light isolating layer are imaged on the image sensor is reduced.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application;
fig. 2 is a schematic diagram of an exploded structure of an electronic device according to an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating a partial cross-sectional structure of a fingerprint sensor according to an embodiment of the present application;
FIG. 4 is a schematic diagram illustrating a state where a fingerprint sensor is not in contact with a fingerprint according to an embodiment of the present application;
FIG. 5 is a schematic diagram illustrating a state of a fingerprint sensor contacting a fingerprint according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a partially exploded structure of a fingerprint sensor according to an embodiment of the present application;
FIG. 7 is a schematic diagram showing a state of magnetic induction intensity of a magnetic film not in contact with a fingerprint according to an embodiment of the present application;
FIG. 8 is a schematic diagram showing the magnetic induction intensity of a magnetic film in contact with a fingerprint according to an embodiment of the present application;
FIG. 9 is a schematic diagram illustrating a partial cross-sectional structure of a fingerprint sensor according to another embodiment of the present application;
fig. 10 is a schematic partial sectional view of a fingerprint sensor according to still another embodiment of the present application.
Marking:
10. an electronic device;
20. a display assembly;
30. a housing; 30a, perforating;
40. a main board;
50. an electronic device;
60. a fingerprint sensor;
61. a light emitting assembly; 61a, a light emitting section; 611. a light emitting unit; 612. a polarizer; 613. a light guide layer;
62. a magnetic thin film; 62a, a fingerprint receiving area;
63. a magneto-optical medium layer;
64. an analyzer;
65. an image sensor;
66. a light blocking layer;
70. an external light source;
100. a finger; 110. a fingerprint; 110a, protrusions; 110b, a recess;
x, thickness direction;
p1, a first polarization direction;
p2, second polarization direction.
Detailed Description
The electronic device in the embodiment of the present application may be referred to as a User Equipment (UE) or a terminal (terminal), and the electronic device may be, for example, a tablet (portable android device, PAD), a personal digital assistant (personal digital assistant, PDA), a handheld device with a wireless communication function, a computing device, a vehicle-mounted device, a wearable device, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned (self driving), a wireless terminal in remote medical (remote media), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), or a mobile terminal or a fixed terminal. The form of the terminal device in the embodiment of the application is not particularly limited.
In an embodiment of the present application, fig. 1 schematically shows the structure of an electronic device 10 of an embodiment. Referring to fig. 1, an electronic device 10 is illustrated as a handheld device having wireless communication capabilities. The handheld device of the wireless communication function may be a mobile phone, for example.
Fig. 2 schematically shows a partially exploded structure of the electronic device 10. Referring to fig. 2, the electronic apparatus 10 according to the embodiment of the present application includes a display assembly 20, a housing 30, a main board 40, and an electronic device 50.
The display assembly 20 has a display area for displaying image information. The display assembly 20 is mounted to the housing 30, and a display area of the display assembly 20 is exposed to facilitate presentation of image information to a user. The main board 40 is connected to the housing 30 and is located inside the display assembly 20 so that the main board 40 is not easily seen by a user outside the electronic device 10. The electronic device 50 is disposed on the motherboard 40. The motherboard 40 may be a printed circuit board (Printed Circuit Board, PCB). The electronic device 50 is soldered to the motherboard 40 by a soldering process. The electronic device 50 includes, but is not limited to, a central processing unit (Central Processing Unit, CPU), a smart algorithm chip, or a Power Management chip (PMIC).
The electronic device 10 provided by the embodiment of the application further comprises a fingerprint sensor 60. In some examples, the fingerprint sensor 60 may be disposed on the back of the electronic device 10. The back of the housing 30 is provided with a corresponding opening 30a to avoid the fingerprint sensor 60. The fingerprint sensor 60 may cover the aperture 30a. The opening 30a of the housing 30 also provides a guiding function so that a user can easily place a finger on the fingerprint sensor 60 while holding the electronic device 10. It will be appreciated that the fingerprint sensor 60 may also be disposed on the side of the housing 30 to perform the function of side fingerprint recognition. The fingerprint sensor 60 may be communicatively coupled to the motherboard 40. When the user uses the electronic device 10, fingerprint data of the user may be generated in advance by the fingerprint sensor 60 and stored in the electronic device 10, so that the electronic device 10 may be encrypted by an encryption manner of the fingerprint. When the user uses the electronic device 10 again, the electronic device 10 may identify the fingerprint of the user through the fingerprint sensor 60, and if it is determined that the current fingerprint matches the pre-stored fingerprint information, the electronic device 10 executes an unlock or other corresponding instruction. If the current fingerprint is not matched with the pre-stored fingerprint information, the electronic device 10 does not execute the related instruction, and the current state can be maintained.
It should be noted that the fingerprint 110 is formed by rugged skin, so that the fingerprint 110 includes the protrusions 110a and the recesses 110b. For example, a concave portion 110b is provided between two adjacent protrusions 110 a. The user's fingerprint 110 may be a skin texture of the finger 100, palm, toe, or sole. The fingerprint 110 of the finger 100 is taken as an example for illustration, but the protection scope of the application is not limited.
The implementation of the fingerprint sensor 60 provided in the embodiment of the present application is explained below.
Fig. 3 schematically shows a partial cross-sectional structure of a fingerprint sensor 60 of an embodiment. Referring to fig. 3, a fingerprint sensor 60 according to an embodiment of the present application includes at least a light emitting element 61, a magnetic thin film 62, a magneto-optical medium layer 63, an analyzer 64, and an image sensor 65.
The light-emitting element 61 is configured to emit linearly polarized light. Linearly polarized light may refer to light waves in which the light vector vibrates in only one fixed direction. The light emitting component 61 is configured to provide linearly polarized light to the fingerprint sensor 60, and the linearly polarized light emitted can be used as excitation light of the fingerprint sensor 60. Illustratively, the linearly polarized light exiting the light exit assembly 61 may comprise visible light.
Along the thickness direction X of the magnetic film 62, the magnetic film 62 is located on one side of the light emitting element 61. The surface of the magnetic film 62 facing away from the light emitting component 61 is a fingerprint receiving area 62a. The fingerprint receiving area 62a is an area for contact with the skin of the user. The magnetic film 62 itself has magnetism so that a magnetic field can be generated. The magnetic film 62 itself is flexible, so that it deforms in the area pressed by the fingerprint 110,
Fig. 4 schematically shows a state in which the fingerprint sensor 60 is not in contact with the fingerprint 110. Referring to fig. 4, the user's finger 100 is positioned above the fingerprint-receiving area 62 a. The magnetic film 62 is not in contact with the fingerprint 110 of the finger 100. The magnetic thin film 62 is in an initial state. Fig. 5 schematically shows a state in which the fingerprint sensor 60 is in contact with the fingerprint 110. As shown in fig. 5, the magnetic film 62 is compressively deformed in a region pressed by the protrusion 110a of the fingerprint 110, and becomes smaller in thickness, while the region of the magnetic film 62 corresponding to the recess 110b of the fingerprint 110 is convexly deformed, and becomes larger in thickness. When the thickness of the magnetic thin film 62 is deformed, the magnetic field distribution corresponding to the deformed region is changed, and accordingly, the magnitude of the magnetic induction intensity is also changed. After the fingerprint 110 is identified, the user removes the finger 100 from the fingerprint receiving area 62a, and the magnetic film 62 can restore to its original state under the elastic restoring force of the user, so that the next fingerprint 110 pressing and fingerprint 110 identifying operation is not affected.
The magneto-optical medium layer 63 is located at the other side of the light emitting component 61, so that the magnetic film 62 is opposite to the magneto-optical medium layer 63, i.e. the magnetic film 62 and the magneto-optical medium layer 63 are located at two sides of the light emitting component 61 respectively. The magneto-optical medium layer 63 is located in the magnetic field of the magnetic film 62. The magneto-optical medium layer 63 is configured to receive the linearly polarized light emitted from the light emitting element 61 and to rotate the linearly polarized light. The magneto-optical medium layer 63 is a medium layer that can produce a magneto-optical effect.
Fig. 6 schematically shows a partially exploded structure of the fingerprint sensor 60. As shown in fig. 6, since the magneto-optical medium layer 63 is located in the magnetic field of the magnetic film 62, when the linearly polarized light propagates along the direction of the magnetic field after entering the magneto-optical medium layer 63, the linearly polarized light in the magnetic field rotates by the magneto-optical medium layer 63, so that an included angle β is formed between the linearly polarized light exiting from the magneto-optical medium layer 63 and the linearly polarized light entering the magneto-optical medium layer 63. The angle beta is also called the rotation angle. The magnetic field direction is the same as the thickness direction X of the magnetic thin film 62. The rotation plane when the linearly polarized light rotates is perpendicular to the thickness direction X of the magnetic thin film 62. Illustratively, the included angle β may have a value ranging from, but not limited to, 2 ° to 30 °, for example, the included angle β may have a value of, but not limited to, 5 °, 8 °, 10 °, 15 °, or 20 °. The magnitude of the angle beta is positively correlated with the thickness d of the magneto-optical medium layer 63, the magnetic induction B, and the Fisher (Verdet) constant of the material of the magneto-optical medium layer 63 itself. At least one of the thickness d of the magneto-optical medium layer 63, the magnetic induction B, and the Verdet constant of the material of the magneto-optical medium layer 63 itself increases, and accordingly, at least one decreases, the angle β decreases.
Illustratively, fig. 7 schematically shows a state of magnetic induction intensity where the magnetic thin film 62 is not in contact with the fingerprint 110. Referring to fig. 7, when the fingerprint 110 of the finger 100 is not in contact with the magnetic film 62, the magnetic film 62 is in an initial state, and the magnetic induction intensity of the magnetic field generated by the magnetic film is B0. Each region of the magneto-optical medium layer 63 is located in a magnetic field having a magnetic induction of B0. The rotation angle β of the linearly polarized light after exiting from each region of the magneto-optical medium layer 63 is the same.
Fig. 8 schematically shows a state of magnetic induction intensity of the magnetic thin film 62 in contact with the fingerprint 110. Referring to fig. 8, when a user contacts the fingerprint 110 of the finger 100 with the magnetic film 62 and applies a pressing force, the pressed region of the magnetic film 62 is deformed to change the thickness so that the magnetic induction intensities of the magnetic fields generated in the region are B1 and B2, respectively, wherein the magnetic induction intensity of the magnetic field corresponding to the protrusion 110a of the fingerprint 110 is B1 and the magnetic induction intensity of the magnetic field corresponding to the recess 110B of the fingerprint 110 is B2. The areas of the magnetic film 62 that are not pressed have unchanged thickness, so that the magnetic induction of the magnetic field generated by these areas remains B0. A partial region of the magneto-optical medium layer 63 is located in the magnetic field having a magnetic induction of B0, while a region corresponding to the protrusion 110a of the fingerprint 110 is located in the magnetic field having a magnetic induction of B1, and a region corresponding to the recess 110B of the fingerprint 110 is located in the magnetic field having a magnetic induction of B2. Since the thickness of the magneto-optical medium layer 63 and the Verdet constant of the material thereof are the same, and the magnetic induction intensity B0, the magnetic induction intensity B1, and the magnetic induction intensity B2 are different from each other, the rotation angle β of the linearly polarized light after exiting the regions corresponding to the magnetic induction intensity B0, the magnetic induction intensity B1, and the magnetic induction intensity B2 on the magneto-optical medium layer 63 is different.
The analyzer 64 is located on the side of the magneto-optical medium layer 63 facing away from the light exit element 61. The analyzer 64 is for receiving the linearly polarized light emitted from the magneto-optical medium layer 63. The analyzer 64 has a first polarization direction P1 allowing light to pass therethrough. The vibration direction of the linearly polarized light intersects the first polarization direction P1.
Since the vibration direction of the linearly polarized light intersects the first polarization direction P1 of the analyzer 64, a part of the linearly polarized light can pass through the analyzer 64, and the light emitted from the analyzer 64 is linearly polarized light having the same vibration direction as the first polarization direction P1, so that the intensity of the linearly polarized light emitted from the analyzer 64 is smaller than the intensity of the linearly polarized light incident to the analyzer 64. Illustratively, the larger the angle of rotation β of the linearly polarized light emitted from the magneto-optical medium layer 63, the higher the intensity of light that the linearly polarized light can pass through the analyzer 64, and the higher the luminance. Accordingly, the smaller the rotation angle β, the smaller the intensity of light that can pass through the analyzer 64, and the lower the brightness.
The image sensor 65 is located on the side of the analyzer 64 facing away from the magneto-optical medium layer 63. The image sensor 65 is configured to receive the linearly polarized light emitted from the analyzer 64. The linearly polarized light emerging from each region of the analyzer 64 may be projected onto an image sensor 65 to form a corresponding image.
Illustratively, when the magnetic film 62 of the fingerprint sensor 60 does not contact the fingerprint 110, the magnetic induction generated by the magnetic film 62 is unchanged. The optical rotation angle of the linearly polarized light in the magneto-optical medium layer 63 is the same, so that the image formed by the linearly polarized light of the analyzer 64 is unchanged.
When the fingerprint 110 of the finger 100 is placed on the magnetic film 62 of the fingerprint sensor 60, the protrusions 110a and the recesses 110b of the fingerprint 110 change the thickness of the magnetic film 62, so that the regions of the magnetic film 62 corresponding to the protrusions 110a and the recesses 110b are deformed to different extents, and the magnetic fields of the magnetic film 62 corresponding to the protrusions 110a and the recesses 110b are distributed differently, so that the generated magnetic induction intensities are also different. In the region where the magnetic induction intensity is not changed, the rotation angle β of the linearly polarized light in the magneto-optical medium layer 63 is not changed, so that the intensity of the light transmitted through the analyzer 64 is not changed, and the image generated on the image sensor 65 is not changed. In the region where the magnetic induction intensity changes, the rotation angle β of the linearly polarized light in the magneto-optical medium layer 63 changes, so that the intensity of the light transmitted through the analyzer 64 changes, the image generated on the image sensor 65 changes, and a corresponding fingerprint 110 contour can be imaged on the image sensor 65. The image sensor 65 may convert the image information into an electrical signal to be output to the controller. The controller compares with the original pre-stored fingerprint 110 data. If the two match, the electronic device 10 may execute an instruction such as unlocking. If the two do not match, the electronic device 10 remains in the current state, e.g., in the locked state.
In the fingerprint sensor 60 according to the embodiment of the present application, when the user's fingerprint 110 does not press the magnetic film 62, the light intensity of the linearly polarized light passing through the magneto-optical medium layer 63 and the analyzer 64 does not change, so that the image on the image sensor 65 does not change. When the user's fingerprint 110 presses the magnetic film 62, the intensity of the magnetic induction of the magnetic field generated by the magnetic film 62 changes accordingly, so that the intensity of the linearly polarized light transmitted through the magneto-optical medium layer 63 and the analyzer 64 and emitted from the region corresponding to the fingerprint 110 changes, and the intensity of the light received by the image sensor 65 changes, so that the image on the image sensor 65 changes and the corresponding profile of the fingerprint 110 is imaged. The fingerprint 110 profile is then identified and aligned to enable the electronic device 10 to execute the corresponding instructions.
When the fingerprint 110 of the user is in a wet state and the fingerprint 110 of the user is in contact with the magnetic film 62, the skin of the user and the magnetic film 62 jointly squeeze the liquid to enable the liquid to flow to other areas, so that the thickness of the areas, corresponding to the protrusions 110a and the recesses 110b of the fingerprint 110, on the magnetic film 62 is changed, the magnetic induction intensity is still changed, and the influence of the liquid is avoided. Therefore, the fingerprint sensor 60 can still accurately acquire the fingerprint 110 data, so that the identification accuracy of the fingerprint sensor 60 is effectively improved, the possibility of failure of fingerprint 110 identification is reduced, and the convenience and experience of the electronic device 10 are improved.
In some implementations, referring to fig. 5, the light emitting assembly 61 includes a light emitting unit 611 and a polarizer 612. The light emitting unit 611 itself may actively emit light in an energized state. The light emitted from the light emitting unit 611 may include visible light. The light emitting unit 611 may be a surface light source or a point light source, for example. The Light Emitting unit 611 may include a cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp, CCFL) or an Organic Light-Emitting Diode (OLED), for example.
A polarizer 612 is disposed between the light emitting unit 611 and the magneto-optical medium layer 63. A part of the light emitted from the light emitting unit 611 passes through the polarizer 612. The polarizer 612 is configured to convert light emitted from the light emitting unit 611 into linearly polarized light. The polarizer 612 has a second polarization direction P2 allowing light to pass therethrough. Of the light emitted from the light emitting unit 611, the light having the same vibration direction as the second polarization direction P2 may pass through the polarizer 612 and form linearly polarized light. After the light emitted from the light emitting unit 611 passes through the polarizer 612, the intensity of the linearly polarized light emitted from the polarizer 612 decreases, that is, the intensity of the linearly polarized light is smaller than the intensity of the light emitted from the light emitting unit 61.
In the fingerprint sensor 60, the magnetic film 62, the polarizer 612, the magneto-optical medium layer 63 and the analyzer 64 do not need to be additionally provided with corresponding circuit modules, so that the whole circuit module of the fingerprint sensor 60 is simple in design, and the fingerprint sensor 60 is simple in whole structure.
In some examples, referring to fig. 6, a first polarization direction P1 of analyzer 64 intersects a second polarization direction P2 of polarizer 612. The angle between the first polarization direction P1 of the analyzer 64 and the second polarization direction P2 of the polarizer 612 may range from 70 ° to 80 °. Therefore, in an initial state in which the fingerprint sensor 60 is not in contact with the fingerprint 110, the linearly polarized light emitted from the polarizer 612 passes through the magneto-optical medium layer 63 and the analyzer 64, and then a part of the linearly polarized light may pass through the analyzer 64, so that the receiving surface of the image sensor 65 exhibits a predetermined brightness.
The resolution of the image formed by the received light on the receiving surface of the image sensor 65 is related to the value of the angle between the first polarization direction P1 of the analyzer 64 and the second polarization direction P2 of the polarizer 612 and the value of the rotation angle β. Therefore, by properly selecting the angle between the first polarization direction P1 of the polarizer 612 and the second polarization direction P2 of the analyzer 64, it is ensured that the fingerprint 110 image with better image brightness and image resolution is obtained on the image sensor 65.
In other possible implementations, fig. 9 schematically shows a partial cross-sectional structure of the fingerprint sensor 60. Referring to fig. 9, the light emitting assembly 61 includes a light guide layer 613 and a polarizer 612. A polarizer 612 is disposed between the light guide layer 613 and the magneto-optical medium layer 63. The polarizer 612 is configured to convert light emitted from the light guide layer 613 into linearly polarized light. In some examples, an external light source 70 is disposed outside the fingerprint sensor 60. The external light source 70 may be located at a side of the light guide layer 613. The light guide layer 613 is configured to receive light of the external light source 70. The light guide layer 613 can guide and distribute the light incident from the outside to homogenize the incident light. The light homogenized by the light guide layer 613 may be incident on the polarizer 612. Illustratively, the material of the light guide layer 613 may be polymethyl methacrylate (polymethyl methacrylate, PMMA). The external light source 70 may include an organic light emitter. For example, the external light source 70 may be disposed at one side of the light guide layer 613. Alternatively, two or more external light sources 70 may be disposed at intervals along the circumferential direction of the light guide layer 613.
In the fingerprint sensor 60, the magnetic film 62, the light guide layer 613, the polarizer 612, the magneto-optical medium layer 63 and the analyzer 64 do not need to be additionally provided with corresponding circuit modules, so that the whole circuit module of the fingerprint sensor 60 is simple in design, and the fingerprint sensor 60 is simple in whole structure.
In some implementations, the fingerprint sensor 60 also includes a transparent glue layer (not shown). A transparent adhesive layer is provided between the surface of the light emitting element 61 facing the magnetic film 62 and the magnetic film 62 to connect the light emitting element 61 and the magnetic film 62. A transparent glue layer is provided between the surface of the magneto-optical medium layer 63 facing the magnetic film 62 and the polarizer 612 to connect the magneto-optical medium layer 63 and the polarizer 612. A transparent adhesive layer is provided between the surface of the magneto-optical medium layer 63 facing the analyzer 64 and the analyzer 64 to connect the magneto-optical medium layer 63 and the analyzer 64. The transparent bonding layer has good light transmittance, is favorable for reducing the attenuation rate of linearly polarized light when passing through the transparent bonding layer, and ensures that the light intensity passing through the transparent bonding layer meets the requirement.
In other implementations, polarizer 612 is disposed directly on the surface of magneto-optical medium layer 63 that faces magnetic film 62. No other connecting pieces are additionally arranged between the polarizer 612 and the magneto-optical medium layer 63, so that on one hand, linearly polarized light emitted from the polarizer 612 can directly enter the magneto-optical medium layer 63, which is beneficial to reducing the attenuation rate of the linearly polarized light and reducing the possibility of interference of the linearly polarized light caused by refraction or reflection of the linearly polarized light in the additionally arranged connecting pieces; on the other hand, the overall thickness of the polarizer 612 and the magneto-optical medium layer 63 can be reduced, which is beneficial to ensuring that the magnetic field of the magnetic film 62 effectively acts on the magneto-optical medium layer 63, reducing the possibility that the magnetic induction intensity at the magneto-optical medium layer 63 is weak due to the larger overall thickness of the polarizer 612 and the magneto-optical medium layer 63, and the linearly polarized light in the magneto-optical medium layer 63 cannot rotate or the rotation angle does not reach a preset angle; in still another aspect, the thickness of the fingerprint sensor 60 may be advantageously reduced, so that the overall structure of the fingerprint sensor 60 is more compact, and a miniaturized design of the fingerprint sensor 60 may be realized.
In some examples, the polarizer 612 is formed in a layered shape by a plating process or a coating process on the surface of the magneto-optical medium layer 63 facing the magnetic thin film 62, so that the polarizer 612 itself has a small thickness.
In other realizations, an analyzer 64 is disposed directly on the surface of the magneto-optical medium layer 63 facing the image sensor 65. No other connecting piece is additionally arranged between the analyzer 64 and the magneto-optical medium layer 63, so that the linearly polarized light emitted from the magneto-optical medium layer 63 can directly enter the analyzer 64, which is beneficial to reducing the attenuation rate of the linearly polarized light and reducing the possibility of interference of the linearly polarized light caused by refraction or reflection of the linearly polarized light in the additionally arranged connecting piece.
In some examples, the layered analyzer 64 is formed on the surface of the magneto-optical medium layer 63 facing the image sensor 65 by a plating process or a coating process, so that the analyzer 64 itself has a small thickness.
In some implementations, the polarizer 612 or the analyzer 64 is a polarizer, so that the polarizer 612 or the analyzer 64 itself has a smaller thickness, which is advantageous in reducing the thickness of the fingerprint sensor 60 as a whole. When the polarizer 612 is a polarizing plate, the possibility of adverse effect on the magnetic field of the magnetic thin film 62 due to the large thickness of the polarizer 612 itself can be effectively reduced. The polarizing plate may be a polarizing optic that produces linearly polarized light.
In some implementations, both polarizer 612 and analyzer 64 are polarizers.
In some examples, the polarizer may include a layer structure formed by processing a material having a linear polarization function. For example, the polarizing plate may include a protective film and a polarizing layer. The polarizing layer is located between the two protective films. The polarizing layer plays a role of polarization. The protective film has high light transmittance, good water resistance and high mechanical strength. Illustratively, the material of the polarizing layer may be polyvinyl alcohol (PVA). The material of the protective film may be cellulose Triacetate (TAC).
In some implementations, the thickness of the magneto-optical medium layer 63 is greater than the thickness of the polarizer 612. The thickness of the magneto-optical medium layer 63 is greater than the thickness of the analyzer 64. The thickness d of the magneto-optical medium layer 63 is positively correlated with the magnitude of the rotation angle β as linearly polarized light propagates through the magneto-optical medium layer 63. When the magnetic induction B of the magnetic field generated by the magnetic thin film 62 and the Verdet (Verdet) constant of the magneto-optical medium layer 63 are not changed, the smaller the thickness d of the magneto-optical medium layer 63 is, the smaller the rotation angle β is, and accordingly, the larger the thickness d of the magneto-optical medium layer 63 is, the larger the rotation angle β is. Therefore, the thickness d of the magneto-optical medium layer 63 needs to be properly designed to ensure that the value of the rotation angle β satisfies the requirement.
When the rotation angle β is too small, for example, less than 2 °, there is a possibility that the intensity of the linearly polarized light passing through the analyzer 64 is weak, so that the image of the fingerprint 110, which is obtained on the image sensor 65 and has dark brightness and poor image resolution, may decrease the accuracy of fingerprint 110 identification.
If the rotation angle β is too large, for example, greater than 8 °, the thickness d of the magneto-optical medium layer 63 may be too large, so that the thickness of the entire fingerprint sensor 60 may be too large, which is disadvantageous in the miniaturization of the fingerprint sensor 60.
In some examples, the thickness of the magneto-optical medium layer 63 may range from, but is not limited to, 0.3 mm to 0.8 mm. For example, the thickness of the magneto-optical medium layer 63 may take on a value of 0.5 mm.
In some implementations, the magneto-optical medium layer 63 has a relatively high hardness, and is less subject to deformation under stress. The material of the magneto-optical medium layer 63 is rare earth garnet crystal, so that the Verdet (Verdet) constant of the magneto-optical medium layer 63 can be made larger, which is beneficial to reducing the thickness of the magneto-optical medium layer 63. In addition, the wavelength of the linearly polarized light can be selected according to the optimal working band of the material of the magneto-optical medium layer 63, so that the linearly polarized light can be ensured to pass through the magneto-optical medium layer 63 to realize a better rotation angle. In some examples, the material of the magneto-optical medium layer 63 may be, but is not limited to, yttrium iron garnet crystal (YIG). Correspondingly, the wavelength of the linearly polarized light may be 589 nanometers.
In some implementations, the magnetic film 62 is a nano-magnetic liquid film, so that the magnetic film 62 has better flexibility and is easy to deform when the fingerprint 110 of the finger 100 is pressed. In some examples, the thickness of magnetic film 62 may range from, but is not limited to, 0.3 millimeters to 0.7 millimeters. For example, the thickness of the magnetic film 62 may take on a value of 0.5 mm.
In some implementations, the light extraction assembly 61 includes a light extraction portion 61a. The light-emitting portion 61a of the light-emitting element 61 is disposed facing the magneto-optical medium layer 63. The light emitting component 61 can realize single-side emergent light. The light emitted from the light emitting portion 61a propagates toward the magneto-optical medium layer 63 and can be incident on the polarizer 612, so that the light emitted from the light emitting portion 61a toward the magnetic film 62 is effectively reduced, and the possibility that the light reflected by the magnetic film 62 or the light reflected by the finger 100 itself is finally projected onto the image sensor 65 due to the propagation of the light emitted from the light emitting portion 61a toward the magnetic film 62 is reduced, thereby affecting the definition of the image of the fingerprint 110 on the image sensor 65 and the recognition accuracy of the fingerprint 110.
In some implementations, fig. 10 schematically shows a partial cross-sectional structure of the fingerprint sensor 60. Referring to fig. 10, the fingerprint sensor 60 further includes a light blocking layer 66. The light blocking layer 66 is disposed between the magnetic film 62 and the light emitting element 61. The light blocking layer 66 is configured to isolate the light emitting component 61 from the magnetic film 62, so that on one hand, light emitted from the light emitting component 61 can be blocked from propagating toward the magnetic film 62; on the other hand, the external light of the fingerprint sensor 60 can be blocked from entering the magneto-optical medium and the image sensor 65 through the magnetic film 62, which is beneficial to reducing the possibility that the external light is imaged on the image sensor 65 to influence the definition of the fingerprint 110 image and the recognition precision of the fingerprint 110.
Under the premise that the light-shielding requirements are met by the light-shielding layer 66, the smaller the thickness of the light-shielding layer 66 is, the smaller the influence of the light-shielding layer 66 on the magnetic field generated by the magnetic film 62 is, and meanwhile, the thickness of the fingerprint sensor 60 can be reduced, so that the whole structure of the fingerprint sensor 60 is more compact, and the miniaturized design of the fingerprint sensor 60 can be realized. When the thickness of the light blocking layer 66 is too large, the distance between the magnetic film 62 and the magneto-optical medium layer 63 is large, so that the effect of the magnetic field generated by the magnetic film 62 on the magneto-optical medium layer 63 is weakened, and the magnetic induction intensity at the magneto-optical medium layer 63 is weaker, so that the possibility that the linearly polarized light in the magneto-optical medium layer 63 does not rotate or the rotation angle of the linearly polarized light in the magneto-optical medium layer 63 does not reach a predetermined angle exists, and the identification precision and accuracy of the fingerprint 110 are adversely affected.
In some examples, the light blocking layer 66 is formed on the surface of the light emitting member 61 facing the magnetic film 62 by a plating process or a coating process, so that the light blocking layer 66 itself has a small thickness.
In some examples, the material of the light blocking layer 66 is a material having light absorbing properties. After the light emitted from the light emitting component 61 is incident on the light isolating layer 66, the light isolating layer 66 can absorb the light, so that the possibility that the light is reflected on the light isolating layer 66 is reduced, and the possibility that the definition of the image of the fingerprint 110 and the identification precision of the fingerprint 110 are affected due to the fact that the light reflected from the light isolating layer 66 is imaged on the image sensor 65 is reduced.
In some implementations, the image sensor 65 may be a CMOS (Complementary Metal Oxide Semiconductor) sensor or CCD (Charge Coupled Device) sensor.
In describing embodiments of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "coupled" should be construed broadly, and may be, for example, fixedly coupled, indirectly coupled through an intermediary, in communication between two elements, or in an interaction relationship between two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those of ordinary skill in the art according to specific circumstances.
The embodiments of the application may be implemented or realized in any number of ways, including as a matter of course, such that the apparatus or elements recited in the claims are not necessarily oriented or configured to operate in any particular manner. In the description of the embodiments of the present application, the meaning of "a plurality" is two or more unless specifically stated otherwise.
The terms first, second, third, fourth and the like in the description and in the claims and in the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.
Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The term "plurality" herein refers to two or more. The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship; in the formula, the character "/" indicates that the front and rear associated objects are a "division" relationship.
It will be appreciated that the various numerical numbers referred to in the embodiments of the present application are merely for ease of description and are not intended to limit the scope of the embodiments of the present application.
It should be understood that, in the embodiment of the present application, the sequence number of each process does not mean that the execution sequence of each process should be determined by the function and the internal logic, and should not limit the implementation process of the embodiment of the present application.
Claims (12)
1. A fingerprint sensor (60), characterized in that it comprises at least:
a light-emitting assembly (61) configured to emit linearly polarized light;
the magnetic film (62) is arranged on one side of the light emitting component (61), and the surface of the magnetic film (62) facing away from the light emitting component (61) is a fingerprint receiving area (62 a); wherein the magnetic film (62) is a magnetic film having flexibility;
a magneto-optical medium layer (63) disposed on the other side of the light emitting component (61), the magnetic film (62) being disposed opposite to the magneto-optical medium layer (63), the magneto-optical medium layer (63) being located in a magnetic field generated by the magnetic film (62), the magneto-optical medium layer (63) being configured to receive the linearly polarized light and rotate the linearly polarized light;
an analyzer (64) disposed on a side of the magneto-optical medium layer (63) facing away from the light-emitting element (61), the analyzer (64) having a first polarization direction (P1) allowing light to pass therethrough, and a vibration direction of the linearly polarized light intersecting the first polarization direction (P1);
an image sensor (65) disposed on a side of the analyzer (64) facing away from the magneto-optical medium layer (63), the image sensor (65) being configured to receive the linearly polarized light exiting the analyzer (64);
When the fingerprint presses the magnetic film (62), the thickness of the region of the magnetic film (62) corresponding to the protrusion and the concave part of the fingerprint changes, so that the magnetic induction intensity of the magnetic field generated by the magnetic film (62) in the region changes, the light intensity of the linearly polarized light which passes through the magneto-optical medium layer (63) and the analyzer (64) and exits changes, and the light intensity received by the image sensor (65) correspondingly changes to form a fingerprint profile.
2. Fingerprint sensor (60) according to claim 1, wherein the light exit assembly (61) comprises a light emitting unit (611) and a polarizer (612), the polarizer (612) being arranged between the light emitting unit (611) and the magneto-optical medium layer (63), the polarizer (612) being configured to convert light rays exiting the light emitting unit (611) into the linearly polarized light, the polarizer (612) having a second polarization direction (P2) allowing light rays to pass through, the first polarization direction (P1) intersecting the second polarization direction (P2).
3. The fingerprint sensor (60) of claim 1, wherein the light exit assembly (61) comprises a light guiding layer (613) and a polarizer (612), the polarizer (612) being arranged between the light guiding layer (613) and the magneto-optical medium layer (63), the polarizer (612) being configured to convert light rays exiting from the light guiding layer (613) into the linearly polarized light, the polarizer (612) having a second polarization direction (P2) allowing light rays to pass through, the first polarization direction (P1) intersecting the second polarization direction (P2).
4. A fingerprint sensor (60) according to claim 2 or 3, characterized in that the angle between the first polarization direction (P1) and the second polarization direction (P2) is in the range of 70 ° to 80 °.
5. A fingerprint sensor (60) according to claim 2 or 3, wherein the polarizer (612) is provided directly on the surface of the magneto-optical medium layer (63) facing the magnetic thin film (62); alternatively, the analyzer (64) is directly disposed on a surface of the magneto-optical medium layer (63) facing the image sensor (65).
6. A fingerprint sensor (60) according to claim 2 or 3, wherein the polarizer (612) is a polarizer; alternatively, the analyzer (64) is a polarizer.
7. A fingerprint sensor (60) according to any one of claims 1 to 3, wherein the material of the magneto-optical medium layer (63) is a rare earth garnet crystal; alternatively, the magnetic film (62) is a nano magnetic liquid film.
8. A fingerprint sensor (60) according to any one of claims 1-3, wherein the light exit assembly (61) comprises a light exit portion (61 a), the light exit portion (61 a) being arranged facing the magneto-optical medium layer (63).
9. A fingerprint sensor (60) according to any one of claims 1-3, wherein the fingerprint sensor (60) further comprises a light barrier layer (66), the light barrier layer (66) being arranged between the magnetic thin film (62) and the light extraction assembly (61).
10. The fingerprint sensor (60) of claim 9, wherein the light blocking layer (66) is formed by a plating process or a coating process on a surface of the light emitting component (61) facing the magnetic thin film (62).
11. The fingerprint sensor (60) of claim 9, wherein the light blocking layer (66) is of a material having light absorbing properties.
12. Electronic device (10), characterized in that it comprises at least a fingerprint sensor (60) according to any one of claims 1 to 11.
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