CN111563426A - Optical fingerprint sensing device and mobile terminal - Google Patents
Optical fingerprint sensing device and mobile terminal Download PDFInfo
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- CN111563426A CN111563426A CN202010321308.1A CN202010321308A CN111563426A CN 111563426 A CN111563426 A CN 111563426A CN 202010321308 A CN202010321308 A CN 202010321308A CN 111563426 A CN111563426 A CN 111563426A
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- photoelectric conversion
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- fingerprint sensing
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Images
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
Abstract
The utility model relates to a fingerprint identification technical field, the application discloses an optics fingerprint sensing device and mobile terminal, wherein optics fingerprint sensing device sets up in the screen below, it is high to improve the fingerprint identification precision, it is used for experiencing the sense to improve, optics fingerprint sensing device includes optics sensing chip and photoelectric conversion spare, set up adjusting part between photoelectric conversion spare and optics sensing chip, optics fingerprint sensing device sets up in the screen below, optics sensing adjusting part adjusts photoelectric conversion spare orientation and deviates from the screen and removes, thereby change the distance between photoelectric conversion spare and the screen, make photoelectric conversion spare receive more clear light, in order to solve mole line, the steerable photoelectric conversion spare of adjusting part is for the screen slope, change the contained angle of photoelectric conversion spare and screen, solve mole line problem, improve the identification precision.
Description
Technical Field
The present application generally relates to the field of fingerprint identification technologies, and in particular, to an optical fingerprint sensing device and a mobile terminal.
Background
At present, the underscreen fingerprints are applied to new mobile phones of various large mobile phone manufacturers, mainly on OLED screens. The technology of fingerprint under the screen mainly adopts two kinds: 1. the optical sensor can feed back the grain information on the finger to the sensor in the form of light and dark stripes by utilizing the reflection and refraction principles of light; 2. an ultrasonic sensor for transmitting and receiving ultrasonic waves to and from a finger to construct an image.
The optical sensor has a wide application range, but in the case of interference (such as sweat on a screen), the recognition capability of the optical sensor is limited by a CMOS (metal oxide semiconductor) of the optical sensor, which has a photoelectric conversion function in the sensor, that is, the imaging can be blurred, the CMOS is made transparent and is embedded into an OLED screen, so that the CMOS is closer to the fingerprint of a user, but the cost of the embedding process is high, and in addition, the CMOS can also be influenced by Moire fringes to interfere the imaging.
Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
In order to solve the technical problem of poor identification precision of the cmos optical fingerprint sensor, the present application mainly aims to provide an optical fingerprint sensing device and a mobile terminal.
In order to achieve the purpose of the invention, the following technical scheme is adopted in the application:
an optical fingerprint sensing device is arranged below a screen of a mobile terminal and comprises an optical sensing chip, a photoelectric conversion part and an adjusting component, wherein the adjusting component is respectively connected with the optical sensing chip and the photoelectric conversion part;
the adjusting component is used for adjusting the inclination of the photoelectric conversion part and enabling the photoelectric conversion part to move towards and away from the screen so as to change an included angle and a distance between the photoelectric conversion part and the screen.
Further, in an embodiment of the present invention, the adjusting assembly includes an electromagnet, a magnetic body, and a limiting connection member for limiting the degree of freedom of the photoelectric conversion member;
the electromagnet and the magnetic body are respectively arranged on the optical sensing chip and the photoelectric conversion piece, and the limiting connecting piece is respectively connected with the optical sensing chip and the photoelectric conversion piece.
Further, in an embodiment of the present invention, two magnetic bodies are disposed, and the two magnetic bodies are respectively disposed on two opposite sides of one surface of the photoelectric conversion element facing the optical sensing chip, and two corresponding electromagnets are disposed.
Further, in an embodiment of the present invention, the optical sensing chip has a control unit, and the control unit is electrically connected to the two electromagnets through two circuits, respectively.
Further, in an embodiment of the present invention, the position-limiting connecting member is disposed between the optical sensing chip and the photoelectric conversion element, and the two magnetic bodies are located on two opposite sides of the photoelectric conversion element.
Further, in an embodiment of the present invention, the electromagnet includes an iron core and a coil wound around the iron core, and the iron core is fixed to the optical sensing chip.
Further, in an embodiment of the present invention, the magnetic body is a magnetic plating layer provided on the photoelectric conversion element.
Further, in an embodiment of the present invention, the position-limiting connecting member has elasticity, so that the electromagnet controls the photoelectric conversion member to move between the screen and the optical sensing chip.
Further, in an embodiment of the present invention, the material of the position-limiting connecting member is rubber.
A mobile terminal comprises the optical fingerprint sensing device.
According to the technical scheme, the method has the advantages that: the fingerprint identification precision of the optical fingerprint sensing device is high, and the experience feeling is improved.
This scheme, improve optical sensor, set up adjusting part between photoelectric conversion spare and optical sensing chip, optics fingerprint sensing device sets up in the screen below, optical sensing adjusting part adjusts photoelectric conversion spare orientation and deviates from the screen and removes, thereby change the distance between photoelectric conversion spare and the screen, make photoelectric conversion spare receive more clear light, in order to solve mole line, the steerable photoelectric conversion spare of adjusting part is for the screen slope, change the contained angle of photoelectric conversion spare and screen, solve mole line problem, improve the recognition accuracy.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is an exploded schematic view of an optical fingerprint sensing device according to an exemplary embodiment.
Fig. 2 is a schematic diagram illustrating a side view configuration of an optical fingerprint sensing device according to an exemplary embodiment.
Fig. 3 is a schematic diagram illustrating a partial explosion structure of a mobile terminal according to an exemplary embodiment.
Wherein the reference numerals are as follows:
100-an optical sensing chip; 200-a photoelectric conversion element; 300-an adjustment assembly; 400-glass cover plate; 500-screen;
310-an electromagnet; 320-a magnetic body; 330-limit connecting piece;
311-iron core; 312-coil.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The CMOS module (photoelectric conversion part 200) in the existing optical sensor is fixedly installed and arranged, in the application process, the optical sensor and the screen 500 are relatively fixedly arranged, under the condition that light rays of the screen 500 are interfered, if sweat stains exist on the screen 500, the identification effect of the CMOS module is limited, the CMOS module is embedded into the screen 500, the CMOS module can receive the light rays better, and the embedding process cost is high. The application provides an optical fingerprint sensing device, which can solve the problems of poor identification precision and high cost in the application process of the existing CMOS sensor. The optical fingerprint sensing device comprises an optical sensing chip 100, a photoelectric conversion element 200 and an adjusting component 300, wherein the adjusting component 300 is respectively connected with the photoelectric conversion element 200 and the optical sensing chip 100, and when the optical fingerprint sensing device is installed below a screen 500, the adjusting component 300 can control the photoelectric conversion element 200 to incline, move towards and move away from the screen 500, and change the included angle and the distance between the photoelectric conversion element 200 and the screen 500.
When the user uses the fingerprint recognition function, the user presses the glass cover 400, the corresponding area of the screen 500 emits light to irradiate the surface of the finger above the glass cover 400, the light is reflected on the fingerprint and penetrates the screen 500, the light irradiates the photoelectric conversion element 200, when the light received by the photoelectric conversion element 200 is not clear, the converted image information is incomplete, the incomplete image information is transmitted to the optical sensor chip 100, the optical sensor chip 100 electrically controls the adjustment assembly 300 to operate, the adjustment assembly 300 adjusts the photoelectric conversion element 200 to move towards the screen 500, the position of the photoelectric conversion element 200 is gradually adjusted in a stepping manner, meanwhile, the definition of the fingerprint image obtained after adjustment is confirmed, and after the fingerprint image is clear, the optical sensing chip 100 controls the adjusting assembly 300 to drive the photoelectric conversion element 200 to reset, that is, the photoelectric conversion element 200 is driven to move towards the optical sensing chip 100. When serious moire occurs, the adjusting assembly 300 may control the photoelectric conversion element 200 to tilt, change an included angle between the photoelectric conversion element 200 and the screen 500, change a corresponding relationship between two kinds of stripe spatial frequencies, and further eliminate the moire phenomenon.
Under the understanding of those skilled in the art, in order to better improve the using effect of the user, the position of the photoelectric conversion element 200 when the optical sensing chip 100 can record clear images is taken as the preferred position, so that it can be obtained whether the current position of the photoelectric conversion element 200 matches the preferred position or not at the time of initializing the optical fingerprint sensing device, and if not, the photoelectric conversion element 200 is adjusted to the preferred position.
Example 1
Referring to fig. 1-2, the optical fingerprint sensing device includes an optical sensing chip 100, a photoelectric conversion element 200 and an adjusting assembly 300, wherein the adjusting assembly 300 includes an electromagnet 310, a magnetic body 320 and a limiting connecting element 330, the electromagnet 310 includes an iron core 311 and a coil 312, the iron core 311 is mounted on the optical sensing chip 100, and the coil 312 is wound around the iron core 311.
The limiting connection member 330 is disposed between the optical sensing chip 100 and the photoelectric conversion element 200, and the limiting connection member 330 is connected to the photoelectric conversion element 200 and the optical sensing chip 100, as shown in fig. 2, the limiting connection member 330 is a rectangular parallelepiped structure, the length and width of the limiting connection member 330 are smaller than those of the optical sensing chip 100 and the photoelectric conversion element 200, and a mounting position is reserved for the electromagnet 310 and the magnetic body 320. The spacing connector 330 may be a foam-rubber cushion structure, depending on the role of the spacing connector 330.
It will be appreciated by those skilled in the art that the spacing connector 330 is not limited to a sponge cushion structure, but may be a resilient soft rubber pad or a spring structure made of a non-metallic resilient material. Under the action of the electromagnet 310 and the magnetic body 320, the photoelectric conversion element 200 can move up and down relative to the optical sensor chip 100.
In this embodiment, the electromagnet 310 is installed on the optical sensor chip 100, the magnetic body 320 is installed on the photoelectric conversion element 200, the magnetic body 320 has magnetic poles, and the electromagnet 310 is electrically connected to the optical sensor chip 100. When incomplete image information is transmitted to the optical sensing chip 100, the optical sensing chip 100 energizes the electromagnet 310 through the circuit, the electromagnet 310 repels the magnetic body 320, the photoelectric conversion element 200 gradually moves upwards in a stepping mode under the action of the thrust of the electromagnet 310, meanwhile, the optical sensing chip 100 receives an electric signal sent from the photoelectric conversion element 200 and confirms the definition of a fingerprint image obtained after adjustment, and after the fingerprint image is clear, the optical sensing chip 100 changes the current flowing direction through the coil 312 through the circuit, so that the magnetic pole of the electromagnet 310 is changed, the electromagnet 310 is attracted to the magnetic body 320, the photoelectric conversion element 200 is driven to reset, and the photoelectric conversion element 200 is driven to move towards the optical sensing chip 100.
It should be noted herein that the adjustment assembly 300 shown in the drawings and described in the present specification is but one example in which the principles of the present application can be employed. It should be clearly understood that the principles of this application are in no way limited to any of the details shown in the drawings or described in this specification.
For example, in this embodiment, the position of the electromagnet 310 and the magnetic body 320 can be interchanged, the electromagnet 310 is installed on the photoelectric conversion element 200, the magnetic body 320 is installed on the optical sensing chip 100, in this embodiment, the magnetic body 320 can be a magnetic coating layer disposed on the photoelectric conversion, or a permanent magnet, or the electromagnet 310, and as understood by those skilled in the art, the magnetic body 320 is a structural body having magnetism and magnetic poles.
In order to solve the influence of moire, the adjusting assembly 300 in this embodiment may drive the photoelectric conversion element 200 to tilt, as shown in fig. 1 and fig. 2, two magnets 310 and two magnetic bodies 320 are respectively disposed, the two magnetic bodies 320 are respectively disposed on two opposite sides of one surface of the photoelectric conversion element 200 facing the optical sensing chip 100 and are also located on two opposite sides of the limiting connection member 330, and the electromagnet 310 and the magnetic body 320 are disposed in an up-and-down corresponding manner.
In summary, the present invention also provides a mobile terminal, as shown in fig. 3, the mobile terminal includes a screen 500 and a glass cover 400 covering the screen 500, the optical fingerprint sensing device is disposed below the screen 500, and the photoelectric conversion element 200 of the optical fingerprint sensing device faces the screen 500. When the fingerprint is identified, when the optical sensing chip 100 is not clear according to the received fingerprint image, the optical sensing chip 100 controls the adjusting component 300 to work, the adjusting component 300 adjusts the photoelectric conversion piece 200 to move, thereby changing the distance between the photoelectric conversion piece 200 and the screen 500, enabling the photoelectric conversion piece 200 to receive clearer light, the adjusting component 300 can also control the photoelectric conversion piece 200 to incline relative to the screen 500, changing the included angle between the photoelectric conversion piece 200 and the screen 500, solving the moire problem, and improving the identification precision.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An optical fingerprint sensing device is arranged below a screen (500) of a mobile terminal and is characterized by comprising an optical sensing chip (100), a photoelectric conversion piece (200) and an adjusting component (300) which is respectively connected with the optical sensing chip (100) and the photoelectric conversion piece (200);
the adjusting component (300) is used for adjusting the inclination of the photoelectric conversion piece (200) and enabling the photoelectric conversion piece (200) to move towards and away from the screen (500) so as to change an included angle and a distance between the photoelectric conversion piece (200) and the screen (500).
2. The optical fingerprint sensing device according to claim 1, wherein said adjusting member (300) comprises an electromagnet (310), a magnetic body (320) and a limit connecting member (330) for limiting the degree of freedom of said photoelectric conversion member (200);
the electromagnet (310) and the magnetic body (320) are respectively arranged on the optical sensing chip (100) and the photoelectric conversion piece (200), and the limiting connecting piece (330) is respectively connected with the optical sensing chip (100) and the photoelectric conversion piece (200).
3. The optical fingerprint sensing device according to claim 2, wherein there are two magnetic bodies (320), and two magnetic bodies (320) are respectively disposed on two opposite sides of a surface of the photoelectric conversion element (200) facing the optical sensor chip (100), and there are two corresponding electromagnets (310).
4. The optical fingerprint sensing device according to claim 3, wherein said optical sensing chip (100) has a control unit electrically connected to two of said electromagnets (310) through two circuits, respectively.
5. The optical fingerprint sensing device according to claim 3, wherein said spacing connector (330) is disposed between said optical sensor chip (100) and said photoelectric converter (200), and said two magnetic bodies (320) are disposed on opposite sides of said photoelectric converter (200).
6. The optical fingerprint sensing device according to claim 2, wherein said electromagnet (310) comprises a core (311) and a coil (312) wound around the periphery of said core (311), said core (311) being fixed to said optical sensor chip (100).
7. The optical fingerprint sensing device according to claim 2, wherein said spacing link (330) has elasticity such that said electromagnet (310) controls said photoelectric transducer (200) to move between said screen (500) and said optical sensor chip (100).
8. The optical fingerprint sensing device according to claim 2, wherein said spacing link (330) is a foam pad structure.
9. The optical fingerprint sensing device according to claim 2, wherein said magnetic body (320) is a magnetic coating provided to said photoelectric conversion member (200).
10. A mobile terminal characterized by comprising an optical fingerprint sensing device according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010321308.1A CN111563426A (en) | 2020-04-22 | 2020-04-22 | Optical fingerprint sensing device and mobile terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010321308.1A CN111563426A (en) | 2020-04-22 | 2020-04-22 | Optical fingerprint sensing device and mobile terminal |
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| CN111563426A true CN111563426A (en) | 2020-08-21 |
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| CN202010321308.1A Pending CN111563426A (en) | 2020-04-22 | 2020-04-22 | Optical fingerprint sensing device and mobile terminal |
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Cited By (3)
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| US11574496B2 (en) | 2021-05-18 | 2023-02-07 | Au Optronics Corporation | Fingerprint recognition device |
| US11600099B2 (en) | 2020-08-17 | 2023-03-07 | Au Optronics Corporation | Biological feature identification device and manufacturing method of the same |
| CN117291857A (en) * | 2023-11-27 | 2023-12-26 | 武汉精立电子技术有限公司 | Image processing method, moire eliminating equipment and moire eliminating device |
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