CN115641618A - Fingerprint sensor and electronic equipment - Google Patents
Fingerprint sensor and electronic equipment Download PDFInfo
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- CN115641618A CN115641618A CN202111433636.1A CN202111433636A CN115641618A CN 115641618 A CN115641618 A CN 115641618A CN 202111433636 A CN202111433636 A CN 202111433636A CN 115641618 A CN115641618 A CN 115641618A
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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 component is configured to exit linearly polarized light. The magnetic film is arranged on one side of the light-emitting component. The surface of the magnetic film, which faces 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 film is disposed opposite the magneto-optical medium layer. The magneto-optical medium layer is positioned in a magnetic field generated by the magnetic film. The magneto-optical medium layer is configured to receive the linearly polarized light and rotate the linearly polarized light. The analyzer is arranged on one side of the magneto-optical medium layer, which is back to the light emitting component. The analyzer has a first polarization direction allowing the transmitted light. 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 back to the magneto-optical medium layer. The image sensor is configured to receive linearly polarized light exiting the analyzer. The fingerprint sensor can effectively improve the accuracy of fingerprint identification.
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 (PADs), the functions of the electronic devices are increasing. With the improvement of the user's awareness of the security of information data, more and more electronic devices are added with different encryption modes. For example, the tip of a human finger has a fingerprint formed by uneven skin on the finger pad. The fingerprint lines of each person are different in pattern, break point and cross point, so that the fingerprint has uniqueness and stability. Because the fingerprint characteristics of a human body have the characteristics of uniqueness and stability, along with the development of the technology, more and more electronic devices adopt the fingerprint identification technology to unlock or encrypt the electronic devices, and therefore the safety of personal information in the using process of the electronic devices is effectively improved.
At present, the fingerprint identification technology adopted on electronic equipment is an optical fingerprint identification technology. When a correlation operation is performed by a fingerprint, a finger is placed on 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 the fingerprint image recorded for the first time in the electronic equipment, and finally, identifying and judging. However, when the finger of the user is in a wet state, the finger of the user cannot be recognized by the optical fingerprint recognition system, so that the optical fingerprint recognition is disabled, and the convenience and experience of the electronic device are affected.
Disclosure of Invention
The embodiment of the application provides a fingerprint sensor and electronic equipment, can effectively improve fingerprint sensor's discernment rate of accuracy, reduces the possibility that fingerprint identification became invalid, promotes electronic equipment's convenience of use and experience.
A first aspect of the present application provides a fingerprint sensor, comprising at least a light exit element, a magnetic film, a magneto-optical medium layer, an analyzer, and an image sensor. The light exit component is configured to exit linearly polarized light. The magnetic film is arranged on one side of the light-emitting component. The surface of the magnetic film back to 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 film is disposed opposite the magneto-optical medium layer. The magneto-optical medium layer is positioned in a magnetic field generated by the magnetic film. The magneto-optical medium layer is configured to receive the linearly polarized light and rotate the linearly polarized light. The analyzer is arranged on one side of the magneto-optical medium layer back to the light-emitting component. The analyzer has a first polarization direction allowing the transmitted light. 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 opposite to the magneto-optical medium layer. The image sensor is configured to receive linearly polarized light exiting the analyzer.
According to the fingerprint sensor, 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 does not change, and therefore an image on the image sensor does not change. When a user presses the magnetic film through a fingerprint, the magnetic induction intensity of a magnetic field generated by the magnetic film is correspondingly changed, so that the light intensity of linearly polarized light which penetrates through the magneto-optical medium layer and the analyzer and emits out in an area corresponding to the fingerprint is changed, the light intensity received by the image sensor is changed, and an image on the image sensor is changed to form a corresponding fingerprint outline. Then, the fingerprint outline is identified and compared, so that the electronic equipment executes a corresponding instruction.
Under user's fingerprint is in the moist state, when user's fingerprint and magnetic film contact, user's skin and magnetic film can squeeze liquid jointly, make liquid flow to other regions to the regional change of thickness that can take place that corresponds with the arch of fingerprint and concave part on the magnetic film makes magnetic induction intensity still can change, can not receive the influence of liquid. Therefore, the fingerprint sensor can still accurately acquire fingerprint data, the identification accuracy of the fingerprint sensor is effectively improved, the possibility of fingerprint identification failure is reduced, and the use convenience and experience of the electronic equipment are improved.
In one possible embodiment, the light-emitting assembly includes a light-emitting unit and a polarizer. The polarizer is arranged between the light-emitting unit and the magneto-optical medium layer. The polarizer is configured to convert the light emitted from the light emitting unit into linearly polarized light. The polarizer has a second polarization direction allowing light to pass through. The first polarization direction intersects the second polarization direction. When the fingerprint sensor is in an initial state of not being in contact with a 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 penetrate through the analyzer, so that a receiving surface of the image sensor presents preset brightness.
In one possible embodiment, the light extraction assembly includes a light guiding layer and a polarizer. The polarizer is arranged between the light guide layer and the magneto-optical medium layer. The polarizer is configured to convert light exiting the light guide layer into linearly polarized light. The polarizer has a second polarization direction allowing the light to pass through. 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 a corresponding circuit module does not need to be additionally arranged, the design of the whole circuit module of the fingerprint sensor is simple, and the whole structure of the fingerprint sensor is simple.
In one possible embodiment, the angle between the first polarization direction and the second polarization direction ranges from 70 ° to 80 °.
In one possible embodiment, the polarizer is disposed directly on a surface of the magneto-optical medium layer facing the magnetic 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 be directly incident into the magneto-optical medium layer, the attenuation rate of the linearly polarized light is favorably reduced, and the possibility that the linearly polarized light is refracted or reflected in the additionally arranged connecting pieces to interfere with the linearly polarized light is favorably 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 ensured to effectively act on the magneto-optical medium layer, and the possibility that the magnetic induction intensity at the magneto-optical medium layer is weak due to the fact that the overall thickness of the polarizer and the magneto-optical medium layer is larger, and the linearly polarized light in the magneto-optical medium layer can not rotate or the rotation angle does not reach a preset angle is reduced; on the other hand, the thickness of the whole fingerprint sensor can be reduced, so that the whole structure of the fingerprint sensor is more compact, and the miniaturization design of the fingerprint sensor can be realized.
In one possible embodiment, the analyzer is disposed directly on a 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 be directly incident into the analyzer, the attenuation rate of the linearly polarized light is favorably reduced, and the possibility that the linearly polarized light is refracted or reflected in the additionally arranged connecting pieces to interfere with the linearly polarized light is favorably reduced.
In one possible embodiment, the polarizer is a polarizer; alternatively, the analyzer is a polarizer. The polarizer or the analyzer has small thickness, and the thickness of the whole fingerprint sensor is favorably reduced. When the polarizer is a polaroid, 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 a possible implementation mode, the material of the magneto-optical medium layer is a rare earth garnet crystal, so that the Verdet constant of the magneto-optical medium layer can be larger, and the thickness of the magneto-optical medium layer can be reduced.
In a possible implementation mode, the magnetic film is a nano magnetic liquid film, so that the magnetic film has better flexibility and is easy to deform when a finger fingerprint is pressed.
In one possible embodiment, the light emitting component comprises a light emitting portion. The light emergent portion is disposed facing the magneto-optical medium layer. The light that the light-emitting subassembly is emergent propagates towards the magneto-optical medium layer to effectively reduce the light-emitting volume that the light-emitting subassembly was towards the magnetic film, reduce the light that the light-emitting subassembly is emergent and propagate towards the magnetic film and lead to the light that the magnetic film reflects or the final projection of the light that the finger itself reflects on image sensor, and then influence the definition of fingerprint image and the possibility of fingerprint identification precision on the image sensor.
In a possible embodiment, the fingerprint sensor further comprises a light barrier layer. The light isolating layer is arranged between the magnetic film and the light emitting component. The light isolating layer is configured to isolate the light-emitting component and 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 magnetic film can prevent the external light of the fingerprint sensor from passing through the magnetic film and being incident to the magneto-optical medium and the image sensor, and is beneficial to reducing the possibility that the external light forms images on the image sensor to influence the definition of a fingerprint image and the fingerprint identification precision.
In one possible implementation mode, the light-isolating layer is processed and formed on the surface of the light-emitting component facing the magnetic film through a coating process, so that the thickness of the light-isolating layer is smaller.
In a possible embodiment, the material of the light-blocking layer is a material having the property of absorbing light. After the light emitted by the light-emitting component enters the light-isolating layer, the light-isolating layer can absorb the light, so that the possibility that the light is reflected at the light-isolating layer is favorably reduced, and the possibility that the definition of a fingerprint image and the fingerprint identification precision are influenced due to the fact that the light reflected by the light-isolating layer is imaged on the image sensor is further reduced.
A second aspect of the application provides an electronic device, which at least comprises the fingerprint sensor. 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 component is configured to exit linearly polarized light. The magnetic film is arranged on one side of the light-emitting component. The surface of the magnetic film, which faces 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 film is disposed opposite the magneto-optical medium layer. The magneto-optical medium layer is positioned in a magnetic field generated by the magnetic film. The magneto-optical medium layer is configured to receive and rotate linearly polarized light. The analyzer is arranged on one side of the magneto-optical medium layer back to the light-emitting component. The analyzer has a first polarization direction allowing the transmitted light. 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 faces away from the magneto-optical medium layer. The image sensor is configured to receive linearly polarized light exiting the analyzer.
In one possible embodiment, the light-emitting assembly includes a light-emitting unit and a polarizer. The polarizer is arranged between the light-emitting unit and the magneto-optical medium layer. The polarizer is configured to convert the light emitted from the light emitting unit into linearly polarized light. The polarizer has a second polarization direction allowing the light to pass through. The first polarization direction intersects the second polarization direction. When the fingerprint sensor is in an initial state of not being in contact with a 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 penetrate through the analyzer, so that a receiving surface of the image sensor presents preset brightness.
In one possible embodiment, the light extraction assembly includes a light guiding layer and a polarizer. The polarizer is arranged between the light guide layer and the magneto-optical medium layer. The polarizer is configured to convert light exiting the light guide layer into linearly polarized light. The polarizer has a second polarization direction allowing the light to pass through. 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 polarization analyzer do not need to input or output electric signals, so that a corresponding circuit module does not need to be additionally arranged, the design of the whole circuit module of the fingerprint sensor is simple, and the whole structure of the fingerprint sensor is simple.
In one possible embodiment, the angle between the first polarization direction and the second polarization direction ranges from 70 ° to 80 °.
In one possible embodiment, the polarizer is disposed directly on a surface of the magneto-optical medium layer facing the magnetic 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 be directly incident into the magneto-optical medium layer, the attenuation rate of the linearly polarized light is favorably reduced, and the possibility that the linearly polarized light is refracted or reflected in the additionally arranged connecting pieces to interfere with the linearly polarized light is favorably 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 ensured to effectively act on the magneto-optical medium layer, and the possibility that the magnetic induction intensity at the magneto-optical medium layer is weak and linearly polarized light in the magneto-optical medium layer cannot rotate or the rotating 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; on the other hand, the thickness of the whole fingerprint sensor can be reduced, so that the whole structure of the fingerprint sensor is more compact, and the miniaturization design of the fingerprint sensor can be realized.
In one possible embodiment, the analyzer is disposed directly on a 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 be directly incident into the analyzer, the attenuation rate of the linearly polarized light is favorably reduced, and the possibility that the linearly polarized light is refracted or reflected in the additionally arranged connecting pieces to interfere with the linearly polarized light is favorably reduced.
In one possible embodiment, the polarizer is a polarizer; alternatively, the analyzer is a polarizer. The polarizer or the analyzer has smaller thickness, and is beneficial to reducing the integral thickness of the fingerprint sensor. When the polarizer is a polaroid, the possibility of generating adverse effect on the magnetic field of the magnetic film due to larger 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 a possible implementation mode, the material of the magneto-optical medium layer is a rare earth garnet crystal, so that the Verdet constant of the magneto-optical medium layer can be larger, and the thickness of the magneto-optical medium layer can be reduced.
In a possible implementation mode, the magnetic film is a nano magnetic liquid film, so that the magnetic film has better flexibility and is easy to deform when a finger fingerprint is pressed.
In one possible embodiment, the light emitting component comprises a light emitting portion. The light emergent portion is disposed facing the magneto-optical medium layer. The light of light-emitting subassembly outgoing propagates towards the magneto-optical medium layer to effectively reduce the light-emitting volume of light-emitting subassembly towards the magnetic film, reduce the light of light-emitting subassembly outgoing and propagate towards the magnetic film and lead to the light that the magnetic film reflects or the final projection of the light that the finger itself reflects to image sensor, and then influence the definition of fingerprint image and the possibility of fingerprint identification precision on the image sensor.
In a possible embodiment, the fingerprint sensor further comprises a light barrier layer. The light isolating layer is arranged between the magnetic film and the light emitting component. The light isolating layer is configured to isolate the light-emitting component and 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 magnetic film can prevent the external light of the fingerprint sensor from passing through the magnetic film and being incident to the magneto-optical medium and the image sensor, and is beneficial to reducing the possibility that the external light forms images on the image sensor to influence the definition of a fingerprint image and the fingerprint identification precision.
In one possible implementation mode, the light-isolating layer is processed and formed on the surface of the light-emitting component facing the magnetic film through a coating process, so that the thickness of the light-isolating layer is smaller.
In one possible embodiment, the material of the light-blocking layer is a material having the property of absorbing light. After the light emitted by the light-emitting component enters the light-isolating layer, the light-isolating layer can absorb the light, so that the possibility that the light is reflected at the light-isolating layer is favorably reduced, and the possibility that the definition of a fingerprint image and the fingerprint identification precision are influenced due to the fact that the light reflected by the light-isolating layer is imaged on the image sensor is further reduced.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure;
FIG. 2 is an exploded view of an electronic device in accordance with an embodiment of the present disclosure;
fig. 3 is a schematic partial cross-sectional structural view 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 where a fingerprint sensor is in contact with a fingerprint according to an embodiment of the present application;
FIG. 6 is a partially exploded view of a fingerprint sensor according to an embodiment of the present application;
FIG. 7 is a diagram illustrating the magnetic induction intensity of a magnetic thin film without contacting a fingerprint according to an embodiment of the present application;
FIG. 8 is a diagram illustrating the magnetic induction of a magnetic film in contact with a fingerprint according to an embodiment of the present application;
fig. 9 is a schematic partial sectional view of a fingerprint sensor according to another embodiment of the present application;
fig. 10 is a partial cross-sectional structural schematic view of a fingerprint sensor according to yet another embodiment of the present application.
Description of the labeling:
10. an electronic device;
20. a display component;
30. a housing; 30a, opening a hole;
40. a main board;
50. an electronic device;
60. a fingerprint sensor;
61. a light emitting component; 61a, a light emitting portion; 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, a bump; 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), for example, the electronic device may be a tablet computer (PAD), a 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 (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in city (smart city), a wireless terminal in smart home (smart home), or a fixed wireless terminal. The form of the terminal device is not particularly limited in the embodiment of the present application.
In the embodiment of the present application, fig. 1 schematically shows a structure of an electronic device 10 according to an embodiment. Referring to fig. 1, an electronic device 10 is illustrated as a handheld device having a wireless communication function. The wireless communication enabled handheld device may be a cell phone, for example.
Fig. 2 schematically shows a partially exploded structure of the electronic device 10. Referring to fig. 2, the electronic device 10 according to the embodiment of the present disclosure 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 with the display area of the display assembly 20 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 visible to a user outside the electronic device 10. The electronic device 50 is provided on the main board 40. The main Board 40 may be a Printed Circuit Board (PCB). The electronic device 50 is soldered to the main board 40 through a soldering process. The electronic device 50 includes, but is not limited to, a Central Processing Unit (CPU), a smart algorithm chip or a Power Management IC (PMIC).
The electronic device 10 provided by the embodiment of the application further includes 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 has a guiding function so that a user can easily place a finger on the fingerprint sensor 60 while holding the electronic device 10. It is understood that the fingerprint sensor 60 may also be disposed at the side of the housing 30 to perform the side fingerprint identification function. The fingerprint sensor 60 may be communicatively coupled to the motherboard 40. When the user uses the electronic device 10, the fingerprint sensor 60 may generate fingerprint data of the user in advance, and the fingerprint data may be stored in the electronic device 10, so that the electronic device 10 may be encrypted by means of fingerprint encryption. 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 unlocking or other corresponding instruction. If the current fingerprint is judged not to match the pre-stored fingerprint information, the electronic device 10 does not execute the relevant instruction, and the current state can be maintained.
It should be noted that the fingerprint 110 is formed of an uneven skin, so that the fingerprint 110 includes a protrusion 110a and a recess 110b. For example, the adjacent two protrusions 110a have a recess 110b therebetween. The user's fingerprint 110 may be a skin print of the finger 100, palm, toe, or sole of the foot. The present application takes the fingerprint 110 of the finger 100 as an example for illustration, but does not limit the scope of the present application.
The following explains an implementation of the fingerprint sensor 60 provided in the embodiment of the present application.
Fig. 3 schematically shows a partial sectional structure of a fingerprint sensor 60 of an embodiment. Referring to fig. 3, the fingerprint sensor 60 of the present embodiment includes at least a light exit element 61, a magnetic film 62, a magneto-optical medium layer 63, an analyzer 64, and an image sensor 65.
The light exit member 61 is configured to exit linearly polarized light. Linearly polarized light may refer to a light wave whose light vector vibrates in only one fixed direction. The light emitting member 61 is used to provide linearly polarized light to the fingerprint sensor 60, and the emitted linearly polarized light can be used as excitation light of the fingerprint sensor 60. Exemplarily, the linearly polarized light exiting the light exit member 61 may include visible light.
The magnetic film 62 is located on one side of the light exit element 61 along the thickness direction X of the magnetic film 62. The surface of the magnetic film 62 facing away from the light exit member 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 thin film 62 itself has magnetism, so that a magnetic field can be generated. The magnetic film 62 itself has flexibility, so that it is deformed in the area pressed by the fingerprint 110,
fig. 4 schematically shows a state where the fingerprint sensor 60 is not in contact with the fingerprint 110. Referring to fig. 4, the user's finger 100 is positioned over the fingerprint receiving area 62a. 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 where the fingerprint sensor 60 is in contact with the fingerprint 110. Referring to fig. 5, the magnetic thin film 62 is compressively deformed in the region pressed by the ridges 110a of the fingerprint 110 to reduce the thickness, while the magnetic thin film 62 is convexly deformed in the region corresponding to the valleys 110b of the fingerprint 110 to increase the thickness. When the thickness of the magnetic thin film 62 is deformed, the magnetic field distribution corresponding to the deformed region changes, and accordingly, the magnitude of the magnetic induction changes. After the fingerprint 110 recognition work is completed and the user removes the finger 100 from the fingerprint receiving area 62a, the magnetic film 62 can be restored to the original state by its own elastic restoring force, so as not to affect the next fingerprint 110 pressing and fingerprint 110 recognition operation.
The magneto-optical medium layer 63 is located at the other side of the light exit element 61, so that the magnetic film 62 and the magneto-optical medium layer 63 are oppositely disposed, that is, the magnetic film 62 and the magneto-optical medium layer 63 are respectively located at two sides of the light exit element 61. 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 exiting the light exit 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. Referring to 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 is incident on the magneto-optical medium layer 63 and propagates along the magnetic field, the linearly polarized light is rotated by the magneto-optical medium layer 63 in the magnetic field, so that an included angle β is formed between the linearly polarized light emitted from the magneto-optical medium layer 63 and the linearly polarized light incident on the magneto-optical medium layer 63. The included angle β is also referred to as the angle of rotation. 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 is rotated is perpendicular to the thickness direction X of the magnetic thin film 62. Illustratively, the included angle β may range from, but is not limited to, 2 ° to 30 °, for example, the included angle β may range from, but is not limited to, 5 °, 8 °, 10 °, 15 °, or 20 °. The size of the included angle β is positively correlated with 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. 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, the included angle β increases, and correspondingly, at least one decreases, the included angle β decreases.
Illustratively, fig. 7 schematically shows a state of magnetic induction in which the magnetic 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 of the generated magnetic field is B0. The respective regions of the magneto-optical medium layer 63 are located in a magnetic field with a magnetic induction of B0. The angle of rotation beta of the linearly polarized light after exiting each region of the magneto-optical medium layer 63 is the same.
Fig. 8 schematically shows the state of magnetic induction of the magnetic thin film 62 in contact with the fingerprint 110. Referring to fig. 8, when the user brings the fingerprint 110 of the finger 100 into contact with the magnetic thin film 62 and applies a pressing force, the pressed region of the magnetic thin film 62 is deformed, so that the thickness is changed, and the magnetic induction of the magnetic field generated by the region is B1 and B2, respectively, where the magnetic induction of the magnetic field corresponding to the protrusion 110a of the fingerprint 110 is B1, and the magnetic induction of the magnetic field corresponding to the recess 110B of the fingerprint 110 is B2. The areas of the magnetic thin film 62 that are not pressed do not change in 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 with a magnetic induction B0, while a region corresponding to the protrusion 110a of the fingerprint 110 is located in the magnetic field with a magnetic induction B1 and a region corresponding to the indentation 110B of the fingerprint 110 is located in the magnetic field with a magnetic induction B2. Since the thickness of the magneto-optical medium layer 63 and the Verdet constant of the material thereof are the same, and any two of the magnetic induction B0, the magnetic induction B1 and the magnetic induction B2 are different, the optical rotation angle β of the linearly polarized light emitted from the region corresponding to the magnetic induction B0, the magnetic induction B1 and the magnetic induction B2 on the magneto-optical medium layer 63 is different.
The analyzer 64 is positioned on a side of the magneto-optical medium layer 63 facing away from the light-exiting component 61. The analyzer 64 is arranged to receive linearly polarized light exiting the magneto-optical medium layer 63. The analyzer 64 has a first polarization direction P1 that allows the transmitted light. 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 may 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 greater the angle of rotation β of the linearly polarized light exiting the magneto-optical medium layer 63, the greater the intensity of light that the linearly polarized light can pass through the analyzer 64 and the higher the brightness. Accordingly, the smaller the optical rotation angle β, the smaller the intensity of the light that linearly polarized light can pass through the analyzer 64, and the lower the brightness.
The image sensor 65 is located on a side of the analyzer 64 facing away from the magneto-optical medium layer 63. The image sensor 65 is configured to receive linearly polarized light emitted from the analyzer 64. The linearly polarized light emerging from the various regions of the analyzer 64 may be projected on an image sensor 65 to form a corresponding image.
Illustratively, the magnetic induction generated by the magnetic film 62 of the fingerprint sensor 60 is unchanged when the magnetic film 62 is not in contact with the fingerprint 110. The linearly polarized light in the magneto-optical medium layer 63 has the same rotation angle so that the image formed by the linearly polarized light passing through 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 degrees, and further, the magnetic field distribution of the magnetic film 62 corresponding to the protrusions 110a and the recesses 110b is different, so that the generated magnetic induction intensity is also different. In the region where the magnetic induction intensity is not changed, the optical 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 optical 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 profile can be imaged on the image sensor 65. The image sensor 65 may convert the image information into an electric signal to output to the controller. The controller compares the data with the original pre-stored fingerprint 110. If the two are matched, the electronic device 10 may execute an instruction such as unlock. If the two do not match, the electronic device 10 remains in a current state, such as a locked state.
In the fingerprint sensor 60 of the embodiment of the present application, when the fingerprint 110 of the user does not press the magnetic film 62, the intensity of the linearly polarized light passing through the magneto-optical medium layer 63 and the analyzer 64 is not changed, and thus the image on the image sensor 65 is not changed. When the fingerprint 110 of the user presses the magnetic film 62, the magnetic induction intensity 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 area 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 forms the corresponding fingerprint 110 contour. Then, the fingerprint 110 profile is identified and compared to realize that the electronic device 10 executes the corresponding instruction.
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 press the liquid together to make the liquid flow to other areas, so that the areas of the magnetic film 62 corresponding to the protrusions 110a and the recesses 110b of the fingerprint 110 have thickness variation, and the magnetic induction intensity is still varied and is not influenced by the liquid. Therefore, the fingerprint sensor 60 can still accurately acquire the data of the fingerprint 110, so that the identification accuracy of the fingerprint sensor 60 is effectively improved, the possibility of identification failure of the fingerprint 110 is reduced, and the use convenience and experience of the electronic device 10 are improved.
In some realizable ways, as shown in FIG. 5, the light exit component 61 includes a light emitting cell 611 and a polarizer 612. The light emitting unit 611 itself may actively emit light in a power-on 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. Exemplarily, the Light Emitting unit 611 may include a Cold Cathode Fluorescent Lamp (CCFL) or an Organic Light-Emitting Diode (OLED).
A polarizer 612 is disposed between the light-emitting cell 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 the light emitted from the light emitting unit 611 into linearly polarized light. The polarizer 612 has a second polarization direction P2 allowing the transmitted light. 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 assembly 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 design of the whole circuit module of the fingerprint sensor 60 is simple, and the whole structure of the fingerprint sensor 60 is simple.
In some examples, referring to fig. 6, the first polarization direction P1 of the analyzer 64 intersects the second polarization direction P2 of the 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 where 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 be transmitted through the analyzer 64, thereby causing the receiving surface of the image sensor 65 to exhibit a predetermined brightness.
The resolution of the image formed by the light received 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 angle of optical rotation 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, the fingerprint 110 image with better image brightness and image resolution can be obtained on the image sensor 65.
In other implementations, fig. 9 schematically shows a partial cross-sectional structure of the fingerprint sensor 60. Referring to fig. 9, the light exit assembly 61 includes a light guide layer 613 and a polarizer 612. Polarizer 612 is disposed between light guiding layer 613 and magneto-optical medium layer 63. The polarizer 612 is configured to convert light exiting the light guide layer 613 into linearly polarized light. In some examples, an external light source 70 is provided 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 from the external light source 70. The light guide layer 613 can guide and distribute the external incident light to make the incident light uniform. The light homogenized by the light guiding layer 613 can be incident to a polarizer 612. For example, the material of the light guide layer 613 may be 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 provided at intervals in 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 design of the whole circuit module of the fingerprint sensor 60 is simple, and the whole structure of the fingerprint sensor 60 is simple.
In some realizable manners, the fingerprint sensor 60 further comprises a transparent glue layer (not shown in the figures). A transparent glue layer is provided between the surface of the light exit member 61 facing the magnetic thin film 62 and the magnetic thin film 62 to connect the light exit member 61 and the magnetic thin film 62. A transparent glue layer is arranged 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 glue layer is arranged 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 cementing layer has good light transmission, is favorable for reducing the attenuation rate when linearly polarized light passes through the transparent cementing layer, and ensures that the light intensity passing through the transparent cementing layer meets the requirement.
In other implementations, the polarizer 612 is disposed directly on the surface of the magneto-optical medium layer 63 facing the magnetic film 62. No other connecting piece is 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 be directly incident into the magneto-optical medium layer 63, the attenuation rate of the linearly polarized light is favorably reduced, and the possibility that the linearly polarized light is refracted or reflected in the additionally arranged connecting piece to interfere with the linearly polarized light is favorably reduced; 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, and reducing the possibility that the linear polarization light in the magneto-optical medium layer 63 can not rotate or the rotation angle does not reach the preset angle due to weak magnetic induction intensity at the magneto-optical medium layer 63 caused by the large overall thickness of the polarizer 612 and the magneto-optical medium layer 63; on the other hand, the thickness of the entire fingerprint sensor 60 can be reduced, so that the entire structure of the fingerprint sensor 60 is more compact, and the miniaturization design of the fingerprint sensor 60 can be realized.
In some examples, the polarizer 612 is processed in a layered form 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 implementations, the analyzer 64 is disposed directly on a surface of the magneto-optical medium layer 63 facing the image sensor 65. Other connecting pieces are not additionally arranged between the analyzer 64 and the magneto-optical medium layer 63, so that linearly polarized light emitted from the magneto-optical medium layer 63 can be directly incident into the analyzer 64, the attenuation rate of the linearly polarized light is favorably reduced, and the possibility that the linearly polarized light is refracted or reflected in the additionally arranged connecting pieces to interfere with the linearly polarized light is favorably reduced.
In some examples, the layer-shaped analyzer 64 is formed by a plating process or a coating process on the surface of the magneto-optical medium layer 63 facing the image sensor 65, so that the thickness of the analyzer 64 itself is small.
In some implementations, the polarizer 612 or the analyzer 64 is a polarizer, so that the thickness of the polarizer 612 or the analyzer 64 is small, which is beneficial to reduce the thickness of the fingerprint sensor 60 as a whole. When the polarizer 612 is a polarizing plate, the possibility that the magnetic field of the magnetic thin film 62 is adversely affected by the large thickness of the polarizer 612 itself can be effectively reduced. The polarizer may be a polarizing optical device that generates linearly polarized light.
In some realizable forms, both the polarizer 612 and the analyzer 64 are polarizers.
In some examples, the polarizer may include a layer structure processed from 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 functions as a polarizer. 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 triacetyl cellulose ester (TAC).
In some realizable forms, 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 larger 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 optical rotation angle beta when linearly polarized light propagates through the magneto-optical medium layer 63. In a case where the magnetic induction B of the magnetic field generated by the magnetic 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 optical rotation angle β is, and accordingly, the larger the thickness d of the magneto-optical medium layer 63 is, the larger the optical rotation angle β is. Therefore, the thickness d of the magneto-optical medium layer 63 needs to be designed appropriately to ensure that the value of the optical rotation angle β meets the requirement.
When the optical rotation angle β is too small, for example, less than 2 °, the intensity of the linearly polarized light passing through the analyzer 64 may be weak, so that the fingerprint 110 image with dark image brightness and poor image resolution may be obtained on the image sensor 65, and the recognition accuracy of the fingerprint 110 may be reduced.
If the angle of optical rotation β is too large, for example, greater than 8 °, the thickness d of the magneto-optical medium layer 63 may become too large, which may result in an excessively large thickness of the entire fingerprint sensor 60, which is disadvantageous for the miniaturized design 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. The thickness of the magneto-optical medium layer 63 may be, for example, 0.5 mm.
In some implementations, the magneto-optical medium layer 63 has a relatively high hardness and is not susceptible to deformation when subjected to a force. The magneto-optical medium layer 63 is made of a rare earth garnet crystal, so that the Verdet constant of the magneto-optical medium layer 63 is large, and the thickness of the magneto-optical medium layer 63 is reduced. 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 a better rotation angle of the linearly polarized light after passing through the magneto-optical medium layer 63 is ensured. 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 linearly polarized light may be 589 nanometers.
In some realizable ways, 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 the magnetic thin film 62 may range from, but is not limited to, 0.3 mm to 0.7 mm. For example, the thickness of the magnetic thin film 62 may be 0.5 mm.
In some implementations, the light exiting component 61 includes a light exiting portion 61a. The light emitting portion 61a of the light emitting element 61 is disposed facing the magneto-optical medium layer 63. The light exit element 61 may realize a single-sided light exit. The light emitted from the light emitting portion 61a propagates toward the magneto-optical medium layer 63 and can enter the polarizer 612, so that the light emitting amount of the light emitting portion 61a toward the magnetic film 62 is effectively reduced, and the possibility that the light reflected from the magnetic film 62 or the light reflected from 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 fingerprint 110 image on the image sensor 65 and the recognition accuracy of the fingerprint 110 is further reduced.
In some realizable ways, 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 thin film 62 and the light-exiting component 61. The light-blocking layer 66 is configured to isolate the light-exiting assembly 61 from the magnetic film 62, so that, on the one hand, light exiting the light-exiting assembly 61 can be blocked from propagating towards the magnetic film 62; on the other hand, the external light of the fingerprint sensor 60 can be blocked from passing through the magnetic film 62 and being incident on the magneto-optical medium and the image sensor 65, which is beneficial to reducing the possibility that the external light is imaged on the image sensor 65 to influence the definition of the image of the fingerprint 110 and the identification precision of the fingerprint 110.
On the premise that the light-blocking layer 66 meets the light-blocking requirement, the smaller the thickness of the light-blocking layer 66 is, the smaller the influence of the light-blocking layer 66 on the magnetic field generated by the magnetic film 62 is, and the thickness of the fingerprint sensor 60 can be reduced, so that the overall 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 a magnetic field generated by the magnetic film 62 on the magneto-optical medium layer 63 is weakened, the magnetic induction intensity at the magneto-optical medium layer 63 is weak, the possibility that 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 preset angle exists, and the recognition 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 assembly 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 a property of absorbing light. After the light emitted from the light-emitting assembly 61 enters the light-blocking layer 66, the light-blocking layer 66 can absorb the light, so that the possibility that the light is reflected by the light-blocking layer 66 is reduced, and further, the possibility that the definition of the image of the fingerprint 110 and the identification precision of the fingerprint 110 are influenced by the image of the light reflected by the light-blocking layer 66 on the image sensor 65 is reduced.
In some implementations, the image sensor 65 may be a CMOS (Complementary Metal Oxide Semiconductor) sensor or a CCD (Charge Coupled Device) sensor.
In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. Specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
Reference throughout this specification to apparatus or components, in embodiments or applications, means or components must be constructed and operated in a particular orientation and therefore should not be construed as limiting the present embodiments. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically stated otherwise.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the embodiments of the application and in the drawings described above, 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 is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation 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" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter associated objects are in an "or" relationship; in the formula, the character "/" indicates that the preceding and following related objects are in a relationship of "division".
It is to be understood that the various numerical references referred to in the embodiments of the present application are merely for descriptive convenience 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 numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiment of the present application.
Claims (12)
1. A fingerprint sensor (60) characterized by comprising at least:
a light exit member (61) configured to exit linearly polarized light;
the magnetic film (62) is arranged on one side of the light emitting component (61), and a fingerprint receiving area (62 a) is formed on the surface, back to the light emitting component (61), of the magnetic film (62);
a magneto-optical medium layer (63) arranged on the other side of the light-emitting component (61), wherein the magnetic film (62) is arranged opposite to the magneto-optical medium layer (63), the magneto-optical medium layer (63) is positioned in a magnetic field generated by the magnetic film (62), and the magneto-optical medium layer (63) is configured to receive the linearly polarized light and rotate the linearly polarized light;
the analyzer (64) is arranged on one side, back to the light emitting component (61), of the magneto-optical medium layer (63), the analyzer (64) is provided with a first polarization direction (P1) allowing light to pass through, and the vibration direction of the linearly polarized light is intersected with 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) configured to receive the linearly polarized light exiting the analyzer (64).
2. The fingerprint sensor (60) of claim 1, wherein the light exit component (61) comprises a light emitting unit (611) and a polarizer (612), the polarizer (612) being disposed between the light emitting unit (611) and the magneto-optical medium layer (63), the polarizer (612) being configured to convert light exiting the light emitting unit (611) into the linearly polarized light, the polarizer (612) having a second polarization direction (P2) allowing transmission of light, 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 guide layer (613) and a polarizer (612), the polarizer (612) being disposed between the light guide layer (613) and the magneto-optical medium layer (63), the polarizer (612) being configured to convert light exiting from the light guide layer (613) into the linearly polarized light, the polarizer (612) having a second polarization direction (P2) allowing the light to pass through, the first polarization direction (P1) intersecting the second polarization direction (P2).
4. The fingerprint sensor (60) of claim 2 or 3, wherein the angle between the first polarization direction (P1) and the second polarization direction (P2) ranges from 70 ° to 80 °.
5. The fingerprint sensor (60) of any one of claims 2 to 4, wherein the polarizer (612) is disposed directly on a surface of the magneto-optical medium layer (63) facing the magnetic thin film (62); alternatively, the analyzer (64) is arranged directly on a surface of the magneto-optical medium layer (63) facing the image sensor (65).
6. The fingerprint sensor (60) of any one of claims 2 to 4, wherein the polarizer (612) is a polarizer; alternatively, the analyzer (64) is a polarizer.
7. The fingerprint sensor (60) of any one of claims 1 to 6, wherein the material of the magneto-optical medium layer (63) is a rare earth garnet crystal; or the magnetic film (62) is a nano magnetic liquid film.
8. The fingerprint sensor (60) of any one of claims 1 to 7, wherein the light exit element (61) comprises a light exit portion (61 a), the light exit portion (61 a) being arranged facing the magneto-optical medium layer (63).
9. The fingerprint sensor (60) of any one of claims 1 to 8, wherein the fingerprint sensor (60) further comprises a light-blocking layer (66), the light-blocking layer (66) being disposed between the magnetic film (62) and the light exit component (61).
10. The fingerprint sensor (60) of claim 9, wherein the light-blocking layer (66) is formed by a coating process or a painting process on the surface of the light-emitting component (61) facing the magnetic thin film (62).
11. The fingerprint sensor (60) of claim 9 or 10, wherein the material of the light barrier layer (66) is a material having light-absorbing properties.
12. An 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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