CN107644215B - Optical fingerprint assembly and mobile terminal - Google Patents
Optical fingerprint assembly and mobile terminal Download PDFInfo
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- CN107644215B CN107644215B CN201710897377.5A CN201710897377A CN107644215B CN 107644215 B CN107644215 B CN 107644215B CN 201710897377 A CN201710897377 A CN 201710897377A CN 107644215 B CN107644215 B CN 107644215B
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Abstract
The invention provides an optical fingerprint assembly and a mobile terminal, wherein the optical fingerprint assembly comprises: the light source comprises a transparent cover plate, a light-emitting display screen and a photosensitive element, wherein the light-emitting display screen is positioned between the transparent cover plate and the photosensitive element, a collimating layer is arranged between the transparent cover plate and the photosensitive element, and the collimating layer is used for converting light rays emitted from the transparent cover plate towards the end face of the photosensitive element into collimated light and transmitting the collimated light rays to the photosensitive element; wherein the light is emitted by the light emitting display screen. Therefore, the definition of fingerprint identification can be effectively improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to an optical fingerprint assembly and a mobile terminal.
Background
With the continuous development of the technology, the screen occupation ratio of mobile terminals such as mobile phones is higher and higher, and a full-screen mobile terminal has become a development trend. For the fingerprint identification of the full-screen mobile terminal, the conventional capacitive fingerprint cannot penetrate through cover plate glass with the thickness more than 0.5 millimeter, so that the development trend of the full-screen mobile terminal is not adapted any more, and the optical fingerprint with good penetrability becomes a new technical direction.
At present, the design of fingerprint identification for a full-screen mobile terminal is that an optical fingerprint sensing element is generally designed to be stacked under a display screen. In the practical application of fingerprint identification, the fingerprint on the glass cover plate covering the display screen is pressed through identification; however, the light for identifying the fingerprint at least passes through the display screen and the glass cover plate, and because the glass cover plate has a certain thickness, the light can be seriously refracted and scattered in the process of returning through the glass cover plate, so that the fingerprint image cannot be clearly imaged on the optical fingerprint chip. Therefore, the existing full-screen optical fingerprint identification has the problem of low definition; however, if the optical fingerprint sensing element is a silicon-based CMOS (Complementary Metal oxide semiconductor) image sensor, although the image recognition resolution can be improved, the optical fingerprint sensing element is limited to be used in a small area, and if the optical fingerprint sensing element is applied to full-screen fingerprint recognition, the optical fingerprint sensing element is too large in size and too high in cost, and cannot be used.
Disclosure of Invention
The embodiment of the invention provides an optical fingerprint assembly and a mobile terminal, and aims to solve the problem of low definition of the existing full-screen optical fingerprint identification.
An embodiment of the present invention provides an optical fingerprint assembly, including: the light source comprises a transparent cover plate, a light-emitting display screen and a photosensitive element, wherein the light-emitting display screen is positioned between the transparent cover plate and the photosensitive element, a collimating layer is arranged between the transparent cover plate and the photosensitive element, and the collimating layer is used for converting light rays emitted from the transparent cover plate towards the end face of the photosensitive element into collimated light and transmitting the collimated light rays to the photosensitive element; wherein the light is emitted by the light emitting display screen.
The embodiment of the invention also provides a mobile terminal which comprises the optical fingerprint assembly.
In an embodiment of the present invention, an optical fingerprint assembly includes: the light source comprises a transparent cover plate, a light-emitting display screen and a photosensitive element, wherein the light-emitting display screen is positioned between the transparent cover plate and the photosensitive element, a collimating layer is arranged between the transparent cover plate and the photosensitive element, and the collimating layer is used for converting light rays emitted from the transparent cover plate towards the end face of the photosensitive element into collimated light and transmitting the collimated light rays to the photosensitive element; wherein the light is emitted by the light emitting display screen. Through setting up the collimation layer between photosensitive element and transparent cover like this, the light that will follow the second face outgoing of transparent cover turns into collimated light, improves the conduction angle of light to promote the definition that the fingerprint formed images on photosensitive element, and then promote the fingerprint identification function of optics fingerprint subassembly.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic diagram of an optical fingerprint assembly according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of area A of FIG. 1;
fig. 3 is a second schematic structural diagram of an optical fingerprint device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. 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 invention.
Referring to fig. 1-3, fig. 1 is a schematic structural diagram of an optical fingerprint assembly provided by an embodiment of the present invention; FIG. 2 is an enlarged view of a portion of area A of FIG. 1; fig. 3 is a second schematic structural diagram of an optical fingerprint device according to an embodiment of the present invention.
As shown in fig. 1 to 3, an embodiment of the present invention provides an optical fingerprint assembly 100, including: the light source comprises a transparent cover plate 10, a light-emitting display screen 20 and a photosensitive element 30, wherein the light-emitting display screen 20 is located between the transparent cover plate 10 and the photosensitive element 30, a collimating layer 40 is arranged between the transparent cover plate 10 and the photosensitive element 30, and the collimating layer 40 is used for converting light rays emitted from the transparent cover plate 10 towards the end face of the photosensitive element 30 into collimated light rays and transmitting the collimated light rays to the photosensitive element 30; wherein the light is emitted by the luminescent display screen 20.
In the embodiment of the present invention, the transparent cover plate 10 includes a first surface and a second surface that are opposite to each other, wherein an end surface of the transparent cover plate 10 facing the photosensitive element 30 is the second surface of the transparent cover plate 10, and the transparent cover plate 10 may be a cover plate made of a light-transmitting material, such as cover plate glass, and may play a role in encapsulating and protecting the optical fingerprint assembly 100; the light emitting display screen 20 is located on one side of the second surface of the transparent cover plate 10, and is used for generating red, green and blue light, displaying images, and emitting light for fingerprint identification; the photosensitive element 30 is also located on the second side of the transparent cover plate 10 for enabling imaging of the fingerprint 200. Due to the thickness of the transparent cover 10, the light returning from the finger will form a part of divergent light after exiting from the second side of the transparent cover 10, so that the fingerprint 200 of the finger cannot be clearly imaged on the photosensitive element 30. Through set up collimation layer 40 between transparent cover plate 10 and light sensing element 30, can utilize collimation layer 40 to turn into collimated light with the light of the second face outgoing of transparent cover plate 10 to reach light sensing element 30 on, make the fingerprint 200 of finger can be on light sensing element 30 clear formation of image, thereby effectively promote optical fingerprint subassembly 100's fingerprint identification function.
The working principle of the embodiment of the invention is that in the process of fingerprint identification, a finger presses on the first surface of the transparent cover plate 10, and light generated by the luminous display screen 20 can penetrate through the transparent cover plate 10 to be emitted; when a finger presses the first surface of the transparent cover plate 10, part of the light emitted from the self-luminous display screen 20 is reflected due to the blocking of the finger and then emitted from the second surface of the transparent cover plate 10; the light emitted from the second surface of the transparent cover plate 10 is transmitted to the photosensitive element 30, so that the fingerprint 200 of the finger is imaged on the photosensitive element 30, thereby implementing the fingerprint recognition function. Due to the thickness of the transparent cover 10, the light returning from the finger will form a part of divergent light after exiting from the second side of the transparent cover 10, so that the fingerprint 200 of the finger cannot be clearly imaged on the photosensitive element 30. By arranging the collimation layer 40 between the transparent cover plate 10 and the photosensitive element 30, light emitted from the second surface of the transparent cover plate 10 can be converted into collimated light by the collimation layer 40 and transmitted to the photosensitive element 30, so that the fingerprint 200 of a finger can be clearly imaged on the photosensitive element 30, and the fingerprint identification function of the optical fingerprint assembly 100 is improved.
The optical fingerprint assembly 100 provided by the embodiment of the present invention may be applied to a full screen mobile terminal, and full screen fingerprint identification is performed on a full screen display area, and the photosensitive element 30 may be disposed in a full screen manner, that is, the photosensitive element 30 is disposed in a display area of the light-emitting display screen 20, at this time, as shown in fig. 1, the light-emitting display screen 20 includes a light-emitting surface and a back surface which are disposed opposite to each other, wherein the transparent cover plate 10 is disposed on one side of the light-emitting surface of the light-emitting display screen 20; the photosensitive element 30 is disposed on a back side of the light-emitting display screen 20; and the collimating layer 40 is located between the light emitting display 20 and the light sensing element 30.
With the above scheme, the collimating layer 40 is located between the light emitting display screen and the photosensitive element 30, when a finger presses on the first surface of the transparent cover plate 10, part of light emitted from the light emitting display screen 20 will be reflected due to the blocking of the finger, and then emitted from the second surface of the transparent cover plate 10; the light emitted from the second surface of the transparent cover plate 10 passes through the light-emitting display screen 20, and is collimated into collimated light by the collimating layer 40, and the collimated light is transmitted to the photosensitive element 30, so that the fingerprint 200 of the finger is imaged on the photosensitive element 30, and the function of full-screen fingerprint identification is realized. Because the collimating layer 40 is arranged to collimate the light emitted from the transparent cover plate 10 and the light-emitting display screen 20 to the photosensitive element 30, the problem that imaging is fuzzy during full-screen fingerprint identification in the optical fingerprint identification technology in the prior art can be solved, and the problem that a large-size silicon-based CMOS (Complementary Metal Oxide Semiconductor) image sensor in the prior art is too high in cost and cannot be used for manufacturing a full-screen fingerprint identification mobile terminal is solved, in addition, the photosensitive area can be maximized through the arrangement of the collimating layer 40, so that the problem that the photosensitive element 30 is not enough to be placed below the light-emitting display screen 20 with low transmittance is solved.
It should be noted that the optical fingerprint assembly 100 provided in the embodiment of the present invention may also be applied to a full screen mobile terminal for performing local fingerprint identification, at this time, the photosensitive element 30 is disposed outside the display area of the light-emitting display screen 20, that is, the photosensitive element 30 is only disposed below the transparent cover plate 10 and is located outside the display area of the light-emitting display screen 20, such a scheme may be adopted when designing the local area fingerprint identification of the full screen mobile terminal in the prior art, when the thickness of the transparent cover plate 10 is large, an image blur problem exists by using a common photosensitive element, and when performing the local fingerprint identification, the cost is high by using a silicon-based CMOS image sensor, so that the purposes of improving the fingerprint identification image definition and reducing the cost can be achieved.
The optical fingerprint assembly 100 is applied to a full-screen mobile terminal, and full-screen fingerprint identification is performed on a full-screen display area (that is, the collimating layer 40 is disposed between the light-emitting display 20 and the photosensitive element 30).
In the present embodiment, the light emitting display 20 may be a flexible organic light emitting diode display or a glass organic light emitting diode display.
Optionally, the collimating layer 40 is a fiber collimating layer.
In this embodiment, the collimating layer 40 can be an optical fiber collimating layer, and the optical fiber collimating layer has the characteristics of not only being capable of collimating the angle of the light emitted from the second surface of the transparent cover plate 10, but also having high light conversion efficiency, and can effectively reduce the weakness of the intensity of the light in the conduction process, and enable the light returned by the fingerprint 200 to form clear images on the photosensitive element 30.
It should be noted that, in other embodiments of the present invention, the collimating layer 40 can also be implemented by using other structures, for example: the lens structure capable of converting divergent light into collimated light, and the like, as long as the structure can realize that the light reflected from the first surface of the lens cover plate to the transparent cover plate and transmitted through the transparent cover plate and the light-emitting display screen is collimated into collimated light, shall fall within the protection scope of the present application.
Optionally, there is a positive correlation mapping relationship between the light receiving angle of the collimating layer 40 and the thickness of the display module, wherein the display module includes a transparent cover plate 10 and a light-emitting display screen 20, which are connected by fitting.
In this embodiment, because transparent cover plate 10 all has certain thickness with luminous display screen 20, light blocks through the finger, and the in-process that returns, light conduction angle can change, sets up certain receipts light angle through giving collimation layer 40, can effectively increase the light that can pass collimation layer 40, promotes the integrality of fingerprint 200 at the imaging of light sensing element 30.
Wherein, the light receiving angle of the collimating layer 40 and the thickness of the display module have a positive correlation mapping relationship. The display module comprises a transparent cover plate 10 and a light-emitting display screen 20 which are connected in an attaching mode, namely the thickness of the display module is the superposition of the transparent cover plate 10 and the light-emitting display screen 20. For example, when the thickness range of the transparent cover plate 10 and the light-emitting display screen 20 after being superposed is 0.9-1.3 mm, the light-receiving angle range of the collimating layer 40 is 6-8 degrees; preferably, the thickness of the transparent cover plate 10 and the light-emitting display screen 20 after being stacked is 1.1mm, and the light-receiving angle of the collimating layer 40 is 7 °.
Optionally, as shown in fig. 2, the photosensitive element 30 is an image sensor, the photosensitive element 30 includes a substrate 31 and a plurality of sensor pixel units 32 arranged on the substrate 31 in an array, and the collimating layer 40 includes a plurality of optical fiber units 41.
In the present embodiment, the substrate 31 may be a glass substrate and is used to carry the sensor pixel unit 32; the sensor pixel unit 32 is used for imaging the fingerprint 200 and the fiber unit 41 is used for calibrating the ray angle. The corresponding relationship between the sensor pixel units 32 and the optical fiber units 41 includes one-to-one, one-to-many, or many-to-one, for example, as shown in fig. 1 and fig. 2, each of the sensor pixel units 32 corresponds to one of the optical fiber units 41; each optical fiber unit 41 corresponds to at least two sensor pixel units 32; as shown in fig. 3, each of the sensor pixel units 32 corresponds to at least two of the optical fiber units 41.
In the above solution, one or more optical fibers may be disposed in each optical fiber unit 41.
Optionally, as shown in fig. 3, the light-emitting display screen 20 includes at least two light-emitting units 21, a distance is provided between two adjacent light-emitting units 21, and each sensor pixel unit 32 is disposed opposite to the distance.
In this embodiment, since the optical fiber unit 41 and the sensor pixel unit 32 are arranged in a one-to-one manner, the optical fiber alignment layer and the photosensitive element 30 need to be aligned precisely, which has great difficulty in manufacturing and high cost in the process. However, by disposing the sensor pixel unit 32 at the interval between two adjacent light emitting units 21, the space can be fully utilized, and the light emitted from the second surface of the transparent cover plate 10 can be maximally transmitted to the sensor pixel unit 32.
It should be noted that the optical fingerprint assembly 100 is further provided with a switch element 33, the switch element 33 may be disposed on the substrate 31, and the switch element 33 is used for controlling the operations of the light-emitting display 20 and the photosensitive element 30. In the present embodiment, the switch element 33 may be disposed to face the light emitting unit 21 in order to make full use of the space and to maximize the transmission of the light emitted from the second surface of the transparent cover 10 to the sensor pixel unit 32.
The embodiment of the invention also relates to a mobile terminal comprising the optical fingerprint assembly 100.
The mobile terminal may be a full-screen mobile terminal, such as a full-screen mobile phone or a full-screen tablet computer.
It should be noted that, the implementation manner of the above-mentioned embodiment of the optical fingerprint assembly 100 is also applicable to the embodiment of the mobile terminal, and can achieve the same technical effect, and no further description is provided herein.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (13)
1. An optical fingerprint assembly, comprising: the light source comprises a transparent cover plate, a light-emitting display screen and a photosensitive element, wherein the light-emitting display screen is positioned between the transparent cover plate and the photosensitive element, a collimating layer is arranged between the transparent cover plate and the photosensitive element, and the collimating layer is used for converting light rays emitted from the transparent cover plate towards the end face of the photosensitive element into collimated light and transmitting the collimated light rays to the photosensitive element; wherein the light is emitted by the light-emitting display screen;
the light-emitting display screen comprises a light-emitting surface and a back surface which are arranged in a back-to-back manner; the transparent cover plate is arranged on one side of the light emitting surface of the light emitting display screen; the photosensitive element is arranged on one side of the back of the light-emitting display screen; the collimation layer is positioned between the light-emitting display screen and the photosensitive element;
wherein, the angle of receiving light on collimation layer and display module's thickness have the mapping relation that is positive correlation, wherein, display module is for including the laminating is connected transparent cover plate with luminous display screen.
2. The optical fingerprint assembly of claim 1, wherein the collimating layer is a fiber collimating layer.
3. The optical fingerprint assembly of claim 2, wherein the collimating layer has a light collection angle in a range of 6-8 ° when the display module has a thickness in a range of 0.9-1.3 mm.
4. The optical fingerprint assembly of claim 3, wherein the display module has a thickness of 1.1mm and the collimating layer has a light acceptance angle of 7 °.
5. The optical fingerprint assembly of claim 1, wherein the light sensing element is an image sensor.
6. The optical fingerprint assembly of claim 5, wherein the photosensitive element comprises a substrate and a plurality of sensor pixel units arranged on the substrate in an array, and the alignment layer comprises a plurality of optical fiber units.
7. The optical fingerprint assembly of claim 6, wherein each of the sensor pixel cells corresponds to one of the fiber optic cells.
8. The optical fingerprint assembly of claim 6, wherein each of the fiber units corresponds to at least two of the sensor pixel units.
9. The optical fingerprint assembly of claim 6, wherein each sensor pixel cell corresponds to at least two of the fiber optic cells.
10. The optical fingerprint assembly of claim 6, wherein the light-emitting display screen comprises at least two light-emitting units, and a distance is provided between two adjacent light-emitting units, and each sensor pixel unit is disposed opposite to the distance.
11. The optical fingerprint assembly of claim 1, wherein the light emitting display is a flexible organic light emitting diode display or a glass organic light emitting diode display.
12. A mobile terminal characterized by comprising an optical fingerprint assembly according to any one of claims 1 to 11.
13. The mobile terminal of claim 12, wherein the mobile terminal is a full-screen mobile terminal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710897377.5A CN107644215B (en) | 2017-09-28 | 2017-09-28 | Optical fingerprint assembly and mobile terminal |
| PCT/CN2018/102959 WO2019062439A1 (en) | 2017-09-28 | 2018-08-29 | Optical fingerprint assembly and mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710897377.5A CN107644215B (en) | 2017-09-28 | 2017-09-28 | Optical fingerprint assembly and mobile terminal |
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| CN107644215A CN107644215A (en) | 2018-01-30 |
| CN107644215B true CN107644215B (en) | 2020-07-31 |
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| CN201710897377.5A Active CN107644215B (en) | 2017-09-28 | 2017-09-28 | Optical fingerprint assembly and mobile terminal |
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| WO (1) | WO2019062439A1 (en) |
Families Citing this family (14)
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|---|---|---|---|---|
| CN107644215B (en) * | 2017-09-28 | 2020-07-31 | 维沃移动通信有限公司 | Optical fingerprint assembly and mobile terminal |
| WO2019232685A1 (en) * | 2018-06-05 | 2019-12-12 | 上海箩箕技术有限公司 | Display module |
| CN109271057B (en) * | 2018-08-16 | 2021-04-13 | Oppo广东移动通信有限公司 | Display module and electronic device |
| WO2020102949A1 (en) * | 2018-11-19 | 2020-05-28 | 深圳市汇顶科技股份有限公司 | Fingerprint identification apparatus and electronic device |
| WO2020107381A1 (en) * | 2018-11-30 | 2020-06-04 | 上海箩箕技术有限公司 | Optical fingerprint sensor module and forming method therefor |
| CN109670448B (en) * | 2018-12-20 | 2021-02-23 | 武汉华星光电半导体显示技术有限公司 | Fingerprint identification structure of display screen |
| CN109753919B (en) * | 2018-12-29 | 2021-04-02 | 武汉华星光电技术有限公司 | Optical fingerprint identification device |
| CN109829411B (en) * | 2019-01-24 | 2022-02-11 | 江西沃格光电股份有限公司 | Display panel and display device with fingerprint identification function |
| CN109934144A (en) * | 2019-03-01 | 2019-06-25 | 惠科股份有限公司 | Finger print input device and display device |
| CN110134277A (en) * | 2019-05-10 | 2019-08-16 | 北京兆易创新科技股份有限公司 | A kind of screen construction and electronic product |
| CN110443163B (en) * | 2019-07-19 | 2022-09-30 | 昆山丘钛生物识别科技有限公司 | Fingerprint identification display screen and electronic equipment |
| CN110399861A (en) * | 2019-08-02 | 2019-11-01 | 京东方科技集团股份有限公司 | A kind of lines sensor, display device |
| CN110580473A (en) * | 2019-09-23 | 2019-12-17 | 上海思立微电子科技有限公司 | Fingerprint identification subassembly, display module and electronic equipment |
| CN113093421B (en) * | 2021-03-17 | 2023-06-02 | 武汉华星光电技术有限公司 | Display panel and display device |
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| JP2009139134A (en) * | 2007-12-04 | 2009-06-25 | Ministry Of National Defense Chung Shan Inst Of Science & Technology | Apparatus and method for imaging invariant light spot with large area |
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| CN106773219B (en) * | 2017-02-07 | 2019-11-05 | 京东方科技集团股份有限公司 | A kind of display device |
| CN106897701B (en) * | 2017-02-27 | 2019-08-23 | 京东方科技集团股份有限公司 | Optical finger print identifies mould group and display panel, display device |
| CN107644215B (en) * | 2017-09-28 | 2020-07-31 | 维沃移动通信有限公司 | Optical fingerprint assembly and mobile terminal |
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- 2017-09-28 CN CN201710897377.5A patent/CN107644215B/en active Active
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- 2018-08-29 WO PCT/CN2018/102959 patent/WO2019062439A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106462765A (en) * | 2014-11-12 | 2017-02-22 | 深圳市汇顶科技股份有限公司 | Fingerprint sensors having in-pixel optical sensors |
| CN106886767A (en) * | 2017-02-23 | 2017-06-23 | 京东方科技集团股份有限公司 | A kind of optical fingerprint identification device and display panel |
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| Publication number | Publication date |
|---|---|
| CN107644215A (en) | 2018-01-30 |
| WO2019062439A1 (en) | 2019-04-04 |
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