CN110717437B - Optical collimator, fingerprint identification device, display substrate and display device - Google Patents
Optical collimator, fingerprint identification device, display substrate and display device Download PDFInfo
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- CN110717437B CN110717437B CN201910950106.0A CN201910950106A CN110717437B CN 110717437 B CN110717437 B CN 110717437B CN 201910950106 A CN201910950106 A CN 201910950106A CN 110717437 B CN110717437 B CN 110717437B
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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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/147—Details of sensors, e.g. sensor lenses
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The invention provides an optical collimator, a fingerprint identification device, a display substrate and a display device, belongs to the technical field of display, and can solve the problem that the existing fingerprint identification unit is not high enough in identification efficiency. The optical collimator of the present invention comprises: a light shielding layer having a plurality of light holes thereon; a lens array including a plurality of lens groups; each of the lens groups includes a plurality of lenses; the lens groups are arranged in one-to-one correspondence with the light holes; light rays emitted from each light-transmitting hole irradiate different lenses in the lens group corresponding to the light-transmitting hole at different angles; each lens is used for focusing the light rays irradiated onto the lens.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to an optical collimator, a fingerprint identification device, a display substrate and a display device.
Background
With the rapid development of electronic devices, fingerprint identification technology is increasingly receiving attention. Compared with a common capacitive fingerprint identification device, the optical fingerprint identification device has lower requirements on the screen thickness of the electronic equipment, and the position placed on the electronic equipment can be more flexible, and the screen duty ratio of the electronic equipment can be improved. To achieve these advantages, optical components such as an optical fingerprint sensor and an optical collimator are required to be included in the optical fingerprint recognition device.
In the process of fingerprint identification, light reflected by a finger is modulated by an optical collimator and then enters an optical sensor, so that a fingerprint image is determined according to the identification result of the optical sensor.
The inventors found that the following problems exist in the prior art: most optical collimators have low transmittance, and display brightness needs to be improved when fingerprint identification is performed so as to meet the requirement of fingerprint identification, but long-time highlighting can reduce the service life of a display panel.
Disclosure of Invention
The invention aims to at least solve one of the technical problems in the prior art and provides an optical collimator, a fingerprint identification device, a display substrate and a display device with higher transmittance.
The technical scheme adopted for solving the technical problems of the invention is an optical collimator, which comprises:
a light shielding layer having a plurality of light holes thereon;
a lens array including a plurality of lens groups; each of the lens groups includes a plurality of lenses; the lens groups are arranged in one-to-one correspondence with the light holes;
light rays emitted from each light-transmitting hole irradiate different lenses in the lens group corresponding to the light-transmitting hole at different angles;
each lens is used for focusing the light rays irradiated onto the lens.
Preferably, the optical centers of a plurality of lenses in each lens group are positioned on the same cambered surface, and the cambered surfaces are raised towards the direction away from the shading layer; at least some of the lenses have different apertures.
Preferably, the optical collimator further comprises: and the monochromatic filter layer is arranged corresponding to the light holes and is used for filtering out light rays of other colors except the color of the monochromatic filter layer.
Further preferably, the material of the monochromatic filter layer includes a resin.
The technical scheme adopted for solving the technical problem of the invention is a fingerprint identification device, comprising:
any one of the above optical collimators;
the light holes are used for transmitting light reflected by the fingerprint;
the lens array is arranged on one side of the shading layer far away from the fingerprint contact surface.
Preferably, the fingerprint recognition device further comprises:
the optical sensor is arranged on one side of the lens array, which is away from the shading layer.
Further preferably, the optical sensor includes a monochromatic sensor for sensing monochromatic light;
the monochromatic sensor is used for sensing the light rays of the color of the monochromatic filter layer.
The technical scheme adopted for solving the technical problem of the invention is a display substrate, which comprises any fingerprint identification device.
Preferably, the display substrate includes: OLED display substrates.
The technical scheme adopted for solving the technical problem of the invention is a display device, which comprises any one of the display substrates.
Drawings
FIG. 1 is a schematic diagram of an optical collimator according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another optical collimator according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a fingerprint identification apparatus according to an embodiment of the present invention;
wherein, the reference numerals are as follows: 1. a light shielding layer; 2. a light hole; 3. a lens; 4. a monochromatic light-transmitting layer; 5. and a photoelectric sensing unit.
Detailed Description
The present invention will be described in further detail below with reference to the drawings and detailed description for the purpose of better understanding of the technical solution of the present invention to those skilled in the art.
Example 1:
as shown in fig. 1 and 2, the present embodiment provides an optical collimator, which can be applied to a fingerprint recognition device. The optical collimator includes: a light shielding layer 1 and a lens array. The shading layer 1 is provided with a plurality of light holes 2; the lens array comprises a plurality of lens groups; each lens group includes a plurality of lenses 3; the lens groups are arranged in one-to-one correspondence with the light holes 2; among the light rays emitted through each light-transmitting hole 2, the light rays with different angles are irradiated to different lenses 3 in the lens group corresponding to the light-transmitting hole 2; each lens 3 serves to focus light rays irradiated thereto.
The optical collimator provided in this embodiment is used for collimating and focusing the light reflected by the fingerprint. It can be understood that the reflectivity of the valleys and ridges of the fingerprint to the light is different, so that the light reflected by the fingerprint carries corresponding fingerprint information, and the fingerprint image can be obtained by processing and identifying the light reflected by the fingerprint. In this embodiment, the light holes 2 on the light shielding layer 1 can perform angle screening on the light reflected by the fingerprint, and filter out the light with large angle and stray light. The light penetrating through the light holes 2 is emitted into each lens 3 in the lens group, and each lens 3 collimates and focuses the light irradiated on the lens, so that the light can be focused on the photoelectric sensor, and the photoelectric sensor can accurately identify the light reflected by the fingerprint. Wherein light reflected by the fingerprint is directed to the lens group through the light transmission holes 2 at a plurality of angles. In this embodiment, the light passing through the light hole 2 is collimated and focused by the lens group formed by the plurality of lenses 3, and in the same lens group, the light passing through the light hole 2 at different angles is collimated and focused by different lenses 3, so as to ensure the collimating and focusing effects of the light passing through the light hole 2 in different angle ranges, so that all the light passing through the light hole 2 can be accurately focused to the photoelectric sensor as much as possible, the light transmittance of the optical collimator is improved, and the recognition rate and accuracy of the fingerprint recognition device are further enhanced. Meanwhile, since the optical collimator provided by the embodiment has higher light transmittance, the requirement on the intensity of light is relatively low, and when the optical collimator is applied to a fingerprint identification device, even if the intensity of reflected light is relatively weak, the fingerprint identification function can still be well realized, so that the emergent light brightness of the fingerprint identification device can be adjusted to save power consumption.
Example 2:
the present embodiment provides an optical collimator, as shown in fig. 1, including a light shielding layer 1 and a lens array. The shading layer 1 is provided with a plurality of light holes 2; the lens array comprises a plurality of lens groups; each lens group includes a plurality of lenses 3; the lens groups are arranged in one-to-one correspondence with the light holes 2. Among the light rays emitted through each light-transmitting hole 2, the light rays with different angles are irradiated to different lenses 3 in the lens group corresponding to the light-transmitting hole 2; each lens 3 serves to focus light rays irradiated thereto.
The optical collimator provided by the embodiment can be applied to a fingerprint identification device, and particularly can be applied to the fingerprint identification device of a display panel. In order to make the optical collimator provided in this embodiment more clear and clear, the application of the optical collimator to an OLED display panel will be specifically described below.
The fingerprint reflects the light emitted by the display panel and reflects the light to the fingerprint identification device arranged in the display panel. Specifically, the light reflected by the fingerprint is emitted into the optical collimator, and can be emitted into the photoelectric sensor after being collimated and focused by the optical collimator. The light can be determined to be reflected by the valleys of the fingerprint or reflected by the ridges of the fingerprint through the identification of the photoelectric sensor to the light, namely, the valley and ridge information of the fingerprint can be obtained through the sensing identification of the photoelectric sensor to the light. Wherein the light reflected by the fingerprint propagates in the optical collimator as follows: as shown in fig. 1, the light reflected by the fingerprint is emitted to the optical collimator at a larger range of incidence angles, the light shielding layer 1 is provided with light holes 2, and the light holes 2 in the light shielding layer 1 have an angle selection effect on the light, and can only allow the light within a certain incidence angle range to pass through, thereby playing a role in filtering stray light. It can be understood that, since the light holes 2 block light rays with large angles, the energy of the light rays is extremely weak, so that the effect on the recognition result of fingerprint recognition is not great. The light reflected by the fingerprint passes through the light transmission hole 2 and then is emitted to the lens group. The light reflected by the fingerprint passes through the light transmission hole 2 at a certain range of incidence angles, and the light with different incidence angles is directed to different positions of the lens group, namely, directed to different lenses 3. The lens 3 collimates and focuses the light incident thereon so as to converge the light onto the photosensor.
In this embodiment, the specifications of the lens 3 at different positions can be adjusted accordingly according to the light rays with different incident angles, so that the light rays with different angles can be converged to the photoelectric sensor as much as possible.
Preferably, in this embodiment, the optical centers of the lenses 3 in each lens group are located on the same cambered surface, and the cambered surface protrudes towards the direction away from the light shielding layer 1; at least part of the lenses 3 have different apertures.
That is, as shown in fig. 2, the plurality of lenses 3 in each lens group form a curved surface, not a plane. The light reflected by the fingerprint is emitted to the light transmitting hole 2 at multiple angles and is emitted from the light transmitting hole 2 at multiple angles, namely, the light reflected by the fingerprint is emitted into the lens group at multiple angles. In this embodiment, the light rays with multiple angles reflected by the fingerprint are respectively injected into different lenses 3 in the lens group, and the arrangement mode of the plurality of lenses 3 arranged in the cambered surface can enable the light rays with different angles to be parallel and close to the central line of the corresponding lens 3 as much as possible, so that the effect that the imaging of each lens 3 is paraxial imaging is achieved. Wherein, paraxial imaging refers to that the distance from the optical axis to the light rays emitted by an object is smaller, the divergence angle of the light rays is smaller, and therefore, the aberration of imaging is smaller.
In this embodiment, since the positions of the lenses 3 are different, the angles of the light rays entering the different lenses 3 are also different, so that the light rays entering the lenses 3 can be ensured to be focused to the photoelectric sensor by adjusting the setting angle of the lenses 3 (specifically, setting a plurality of lenses 3 as one cambered surface) and the aperture of each lens 3.
It should be noted that, the light propagates along a straight line, the light rays with similar incident angles are incident into the same lens 3, the light rays incident into the same lens 3 can be regarded as a beam of light rays in the embodiment, when the specification of the lens 3 is selected, the center light rays of the corresponding light beams incident into the lens 3 can be selected as the reference, and the specification of the lens 3 can be adjusted.
Preferably, as shown in fig. 2, the optical collimator further includes: and a monochromatic filter layer 4 disposed corresponding to the light transmission hole 2 for filtering out light rays of colors other than the color of the monochromatic filter layer 4. When the optical collimator is applied to the fingerprint identification device, the color of the light reflected by the fingerprint does not need to be identified. In this embodiment, a monochromatic filter layer 4 may be disposed at a position of the light shielding layer 1 corresponding to the light hole 2, so as to perform spectrum selection on the light entering or exiting the light hole 2 (or the light entering the lens 3), and improve the imaging effect of the lens 3. Specifically, the light emitted by the display panel and reflected by the fingerprint is composed of three colors of red (R), green (G) and blue (B), and when the light is imaged by the lens 3, a certain chromatic aberration is generated, and the imaging effect of the optical collimator is influenced to a certain extent. In this embodiment, the monochromatic filter layer 4 is used to filter out light of other colors, so that only light of one color is kept to pass through, and chromatic aberration can be effectively avoided, thereby improving imaging definition of the optical collimator.
Preferably, the material of the monochromatic filter layer 4 includes a resin. Wherein, the color of the monochromatic filter layer 4 can preferably include: blue-green.
Preferably, a dielectric layer may be further included between the light shielding layer 1 and the lens array, and the dielectric layer may be an air layer or a transparent layer structure such as a resin layer. Alternatively, the dielectric layer may be a transparent layer structure with a certain color to play a role of color filtering.
Example 3:
the present embodiment provides a fingerprint recognition device, as shown in fig. 3, which includes an optical collimator. The optical collimator may be any one of the optical collimators provided in embodiments 1 or 2. Wherein the light hole 2 is used for transmitting the light reflected by the fingerprint; the lens array is arranged on one side of the light shielding layer 1 far away from the fingerprint contact surface.
The fingerprint identification device provided by the embodiment includes the optical collimator provided by the embodiment 1 or the embodiment 2, and the optical collimator can accurately converge light rays to the photoelectric sensor, so that the fingerprint identification device provided by the embodiment has higher fingerprint identification accuracy.
Preferably, the fingerprint identification device provided in this embodiment further includes: the optical sensor is arranged on one side of the lens array, which is away from the shading layer 1. The optical sensor is used for sensing light reflected by the fingerprint, and specifically in this embodiment, the light reflected by the fingerprint after being collimated and focused by the optical collimator. Specifically, the optical collimator converges the light reflected by the fingerprint onto the photoelectric sensor, the photoelectric sensor converts the light signal into an electric signal, and the electric signal is then processed by the processing module for algorithm calculation, so that corresponding fingerprint information can be identified.
Preferably, the optical sensor comprises a monochromatic sensor for sensing monochromatic light. In this embodiment, the monochromatic light sensor can be used to sense only one color of light, so as to filter the chromatic aberration of the light focused by the lens 3 and improve the accuracy of fingerprint identification. Specifically, the light reflected by the fingerprint emitted by the display panel is composed of three colors of red (R), green (G) and blue (B), and when the light is imaged by the lens 3, a certain chromatic aberration is generated, which can have a certain influence on the imaging effect of the optical collimator. In this embodiment, only one color of light focused by the optical collimator is sensed by the monochromatic light sensor, so that the influence caused by chromatic aberration is eliminated as much as possible in the photoelectric sensing and subsequent calculation processing processes, and the accuracy of fingerprint identification is improved.
It should be noted that, in this embodiment, the photoelectric sensor should include a plurality of photoelectric sensing units 5, and each photoelectric sensing unit 5 corresponds to one lens 3, so that the light focused by each lens 3 can be sensed, and thus can be well applied to fingerprint recognition. Each photoelectric sensing unit comprises a plurality of photoelectric sensing pixels, and the plurality of sensing pixels of one photoelectric sensing unit sense and identify light rays passing through the corresponding lens 3 so as to acquire corresponding fingerprint valley and ridge information.
Here, when the optical collimator includes the monochromatic filter layer 4, the monochromatic sensor in the fingerprint recognition device is used to sense the light of the color of the monochromatic filter layer 4. That is, when the optical collimator includes the monochromatic filter layer 4, the color of the light that can be sensed by the monochromatic light sensor should be consistent with the color of the light that can pass through the monochromatic filter layer 4, or, in other words, ensure that the light reflected by the fingerprint can be finally sensed by the photoelectric sensor for performing subsequent fingerprint identification calculation processing.
Since the fingerprint identification device provided in this embodiment includes the optical collimator provided in embodiment 1 or 2, the fingerprint identification device provided in this embodiment has a high identification rate and accuracy. Based on the optical collimator, the intensity requirement of the fingerprint identification light of the fingerprint identification device provided by the embodiment is relatively low, so that the emergent light brightness of the fingerprint identification device can be reduced, and the power consumption is saved.
Example 4:
the present embodiment provides a display substrate including any one of the fingerprint recognition devices provided in embodiment 3.
Preferably, the display substrate in this embodiment includes: OLED display substrates. That is, the display substrate further includes an organic electroluminescent display device. In this embodiment, the fingerprint recognition device may be a single device, and then attached to the substrate, or may be an optical collimator or a photoelectric sensor directly formed on the back surface of the substrate.
Since the display substrate provided in this embodiment includes the fingerprint recognition device provided in embodiment 3, the recognition rate and fingerprint recognition accuracy of the display substrate in this embodiment are high. Meanwhile, the display substrate provided by the embodiment can complete the fingerprint identification function under the condition of low screen brightness, so that the power consumption of the display substrate can be reduced.
Example 5:
the present embodiment provides a display device including the display substrate provided in embodiment 4.
The display device provided in this embodiment may be any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (7)
1. A fingerprint recognition device, comprising: an optical collimator, the optical collimator comprising:
a light shielding layer having a plurality of light holes thereon; the light holes are used for transmitting light reflected by the fingerprint;
a lens array including a plurality of lens groups; each of the lens groups includes a plurality of lenses; the lens groups are arranged in one-to-one correspondence with the light holes; the lens array is arranged on one side of the shading layer far away from the fingerprint contact surface;
the optical sensor is arranged on one side of the lens array, which is away from the shading layer;
light rays emitted from each light-transmitting hole irradiate different lenses in the lens group corresponding to the light-transmitting hole at different angles;
each lens is used for focusing the light rays irradiated on the lens;
the optical centers of a plurality of lenses in each lens group are positioned on the same cambered surface, and the cambered surfaces are protruded towards the optical sensor; at least some of the lenses have different apertures.
2. The fingerprint identification device of claim 1, wherein the optical collimator further comprises: and the monochromatic filter layer is arranged corresponding to the light holes and is used for filtering out light rays of other colors except the color of the monochromatic filter layer.
3. The fingerprint recognition device of claim 2, wherein the material of the single color filter layer comprises a resin.
4. The fingerprint recognition device of claim 2, wherein the optical sensor comprises a monochrome sensor for sensing monochrome light;
the monochromatic sensor is used for sensing the light rays of the color of the monochromatic filter layer.
5. A display substrate comprising a fingerprint recognition device according to any one of claims 1-4.
6. The display substrate according to claim 5, wherein the display substrate comprises: OLED display substrates.
7. A display device comprising the display substrate according to claim 5 or 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910950106.0A CN110717437B (en) | 2019-10-08 | 2019-10-08 | Optical collimator, fingerprint identification device, display substrate and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910950106.0A CN110717437B (en) | 2019-10-08 | 2019-10-08 | Optical collimator, fingerprint identification device, display substrate and display device |
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| CN110717437A CN110717437A (en) | 2020-01-21 |
| CN110717437B true CN110717437B (en) | 2023-08-22 |
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| CN105844212A (en) * | 2015-02-02 | 2016-08-10 | 辛纳普蒂克斯公司 | Optical sensor using collimator |
| CN106298859A (en) * | 2016-09-30 | 2017-01-04 | 京东方科技集团股份有限公司 | Contact panel and display device |
| CN107678146A (en) * | 2017-11-22 | 2018-02-09 | 东莞市美光达光学科技有限公司 | A kind of passive infrared sensor wide-angle optics |
| CN109690564A (en) * | 2018-12-04 | 2019-04-26 | 深圳市汇顶科技股份有限公司 | Optical lens and preparation method thereof, fingerprint recognition mould group, mobile terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1181131A (en) * | 1995-04-07 | 1998-05-06 | Tir技术公司 | Collimating tir lens devices employing fluorescent light sources |
| CN102121600A (en) * | 2011-01-05 | 2011-07-13 | 宁波安迪光电科技有限公司 | Lamp and lamp cover thereof |
| CN105844212A (en) * | 2015-02-02 | 2016-08-10 | 辛纳普蒂克斯公司 | Optical sensor using collimator |
| CN106298859A (en) * | 2016-09-30 | 2017-01-04 | 京东方科技集团股份有限公司 | Contact panel and display device |
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