CN109255323A - A kind of fingerprint recognition structure, display base plate and display device - Google Patents
A kind of fingerprint recognition structure, display base plate and display device Download PDFInfo
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- CN109255323A CN109255323A CN201811026085.5A CN201811026085A CN109255323A CN 109255323 A CN109255323 A CN 109255323A CN 201811026085 A CN201811026085 A CN 201811026085A CN 109255323 A CN109255323 A CN 109255323A
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- fingerprint
- total reflection
- reflection lens
- sensor
- transparent substrates
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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
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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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
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
Abstract
The present invention provides a kind of fingerprint recognition structure, display base plate and display device.Fingerprint recognition structure includes multiple fingerprint graph sensors of array arrangement, and fingerprint graph sensor is for obtaining fingerprint image；It further include the transparent substrates positioned at the sensitive surface side of fingerprint graph sensor and multiple total reflection lens in transparent substrates, total reflection lens are used to make to occur to be totally reflected close at least part light of fingerprint graph sensor side from transparent substrates and return to transparent substrates close to fingerprint graph sensor side.The present invention passes through setting total reflection lens, in total reflection lens corresponding with the ridge of fingerprint frustrated total reflection can occur for light, the fingerprint image acquired by fingerprint graph sensor is only made of both signals, the binary picture of fingerprint can be directly generated, image procossing mode is simple, thereby increases and it is possible to which the error of appearance is smaller.
Description
Technical field
The present invention relates to fingerprint identification technology field more particularly to a kind of fingerprint recognition structures, display base plate and display dress
It sets.
Background technique
Existing optical finger print identification process needs the initial pictures acquired passing through filtering after obtaining fingerprint image
Etc. after initial treatments, be further converted to binary picture through binary conversion treatment, further to binary picture carry out subsequent processing and
The acquisition and treatment process of fingerprint are completed in feature extraction.
Binary picture refers to image only including two kinds of gray-scale pixels, and one of gray-scale pixels correspond to the paddy of fingerprint,
Another pixel corresponds to the ridge of fingerprint.A kind of existing binary conversion treatment process is using a certain gray value as threshold value, and gray scale is greater than
The image grayscale of the threshold value is corrected for 255, and the image grayscale lower than the threshold value is corrected for 0, so that realizing will be collected
Fingerprint image is converted to binary picture.
Since the initial pictures of acquisition are complex, in fact it could happen that various interference lights, and initial pictures are needed through filtering
Wave processing, so image procossing mode is complicated, thereby increases and it is possible to which the error of appearance is larger.
Summary of the invention
The embodiment of the present invention provides a kind of fingerprint recognition structure, display base plate and display device, is known with solving existing fingerprint
The image procossing mode of other structure is complicated, thereby increases and it is possible to the larger problem of the error occurred.
In a first aspect, the embodiment of the invention provides a kind of fingerprint recognition structures, multiple fingerprint images including array arrangement
Shape sensor, the fingerprint graph sensor is for obtaining fingerprint image；
It further include positioned at the transparent substrates of the sensitive surface side of the fingerprint graph sensor and in transparent substrates
Multiple total reflection lens, the total reflection lens are for making from the transparent substrates close to fingerprint graph sensor side
At least part light occur be totally reflected and return to the transparent substrates close to fingerprint graph sensor side.
Optionally, the Refractive Index of Material of the total reflection lens is 1.5 to 2.0.
Optionally, the Refractive Index of Material of the total reflection lens is 1.7 to 2.0.
Optionally, the total reflection lens are hemispherical.
Optionally, the diameter of the total reflection lens is 10 to 100 microns.
Optionally, the height of the total reflection lens is 5 to 50 microns, wherein the height of the total reflection lens is institute
State distance between the farthest point of total reflection lens and the cover board and the cover board.
Optionally, the total reflection lens and the fingerprint graph sensor correspond.
It optionally, further include radio-frequency fingerprint sensor and/or ultrasonic fingerprint sensor, the radio-frequency fingerprint sensor
And/or ultrasonic fingerprint sensor is set to the fingerprint graph sensor backwards to the side of the transparent substrates.
Second aspect the embodiment of the invention also provides a kind of display base plate, including underlay substrate, is formed in the substrate
Display device on substrate and the transparent cover plate being set on the display device, the transparent cover plate are formed with multiple total reflections
Lens, the total reflection lens are used to make at least part light from the transparent cover plate close to the display device side
Occur to be totally reflected and returns to the transparent cover plate close to the display device side.
The third aspect, the embodiment of the invention also provides a kind of display devices, including display base plate and any of the above-described institute
The fingerprint recognition structure stated, wherein the transparent substrates of the fingerprint recognition structure are multiplexed with the transparent cover plate of the display base plate.
The embodiment of the present invention is by setting total reflection lens, when fingerprint tough is to total reflection lens, light with fingerprint
The corresponding total reflection lens of ridge in frustrated total reflection can occur, occur in total reflection lens corresponding with the paddy of fingerprint
Total reflection.There are two types of the light for reflexing to fingerprint graph sensor, and one is the light that total reflection occurs and returns, another
It is the light that frustrated total reflection occurs and returns, the fingerprint image acquired by fingerprint graph sensor is only by both signal structures
At the binary picture of fingerprint can be directly generated, and image procossing mode is simple, thereby increases and it is possible to which the error of appearance is smaller.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, needed in being described below to the embodiment of the present invention
Attached drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention,
For those of ordinary skill in the art, without any creative labor, it can also obtain according to these attached drawings
Take other attached drawings.
Fig. 1 is the structural schematic diagram for the fingerprint recognition structure that first embodiment of the invention provides；
Fig. 2 is a kind of structural schematic diagram for fingerprint recognition structure that first embodiment of the invention provides；
Fig. 3 is the structural schematic diagram for another fingerprint recognition structure that first embodiment of the invention provides；
Fig. 4 is the schematic diagram of total reflection lens in the embodiment of the present invention；
Fig. 5 is the use state diagram for the fingerprint recognition structure that first embodiment of the invention provides；
Fig. 6 is a kind of structural schematic diagram for display base plate that second embodiment of the invention provides；
Fig. 7 is the structural schematic diagram for another display base plate that second embodiment of the invention provides；
Fig. 8 is a kind of structural schematic diagram for display device that third embodiment of the invention provides；
Fig. 9 is the structural schematic diagram for another display device that third embodiment of the invention provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, those of ordinary skill in the art's acquired every other implementation without creative efforts
Example, shall fall within the protection scope of the present invention.
First embodiment:
The present invention provides a kind of fingerprint recognition structures.
As shown in Figure 1, in one embodiment, which includes fingerprint graph sensor 101, transparent substrates
102 and multiple total reflection lens 103 in transparent substrates 102.
In the present embodiment, fingerprint graph sensor 101 is for acquiring fingerprint image, 101 gusts of multiple fingerprint graph sensors
Column arrangement, each fingerprint graph sensor 101 can refer in existing and improved optical finger print identification process selected
Fingerprint graph sensor 101 is not made the specific structure of fingerprint graph sensor 101, principle and arrangement mode further herein
It limits and describes.
Transparent substrates 102 in the present embodiment are located at the sensitive surface side of fingerprint graph sensor 101, transparent substrates 102
Side be provided with multiple total reflection lens 103, as shown in Fig. 2, the total reflection lens 103 in the present embodiment can be spaced and set
It sets, i.e., forms certain intervals between two neighboring total reflection lens 103, as shown in figure 3, can also closely arrange, i.e., adjacent two
A total reflection lens 103 abut against.
As shown in figure 4, Fig. 4 is the schematic diagram of total reflection lens 103, total reflection refers to light by optically denser medium (i.e. light
It is big in the refractive index in this medium) when being mapped to the interface of optically thinner medium (i.e. light refractive index in this medium is small), whole quilts
The phenomenon being reflected back in former medium.Total reflection lens 103 are then so that light is recurred total reflection using this total reflection phenomenon
And the lens of deflection.
As shown in figure 4, total reflection lens 103 are optically denser medium relative to air, light is shone by the direction of transparent substrates 102
When to total reflection lens 103, a part of light recurs multiple total reflection on the interface of total reflection lens 103 and air,
And it returns to former direction or is returned substantially along former direction.
It should be understood that and the not all light for exposing to total reflection lens 103 can be totally reflected, for example, such as
Shown in Fig. 4, the light of the interface of total reflection lens 103 and air, Bu Huifa are pointed into the direction that incidence angle is less than critical angle
Raw total reflection.
In this way, total reflection lens 103 can make from transparent substrates 102 close to 101 side of fingerprint graph sensor at least
A part of light occurs to be totally reflected and returns to transparent substrates 102 close to 101 side of fingerprint graph sensor.
As shown in figure 5, the middle and upper part Fig. 5 represents dactylotype local on the finger of user, fingerprint has paddy 201 and ridge
202 two kinds of features, wherein ridge 202 refers to the part that fingerprint protrudes, and paddy 201 then refers between two neighboring ridge 202
Concave part.
As shown in figure 5, in use process, when fingerprint tough transparent substrates 102,202 part of ridge of fingerprint can be all-trans
The contact of lens 103 is penetrated, and 201 part of paddy of fingerprint is not contacted with total reflection lens 103 then.
When light is pointed into total reflection lens 103 by the direction of transparent substrates 102, if a total reflection lens 103 are right
The position answered is the paddy 201 of fingerprint, then the boundary of the total reflection lens 103 is lens-air, light can will be all-trans at this
The boundary for penetrating lens 103 is totally reflected.
When light is pointed into total reflection lens 103 by the direction of transparent substrates 102, if a total reflection lens 103 are right
The position answered is the ridge 202 of fingerprint, then finger is abutted against with total reflection lens 103, the boundary of total reflection lens 103 is by saturating
Mirror-air becomes lens-skin, and in the boundary of the total reflection lens 103 frustrated total reflection, a part of light occur for light at this time
Line is totally reflected, and another part light penetrates total reflection lens 103.
In this way, reflex to fingerprint graph sensor 101 light only there are two types of, one is occur total reflection and return light
Line, another kind are frustrated total reflection to occur and the light that returns, the fingerprint image acquired by fingerprint graph sensor 101 only by
Both signals constitute, the binary picture of fingerprint can be directly generated, image procossing mode is simple, thereby increases and it is possible to the error of appearance compared with
It is small.
Simultaneously as the testing result error in the present embodiment is smaller, measurement result is relatively accurate, senses to fingerprint graph
The image quality requirement of device 101 is relatively low, helps to reduce cost.
Further, the Refractive Index of Material of the total reflection lens 103 is 1.5 to 2.0.
The calculation formula of the critical angle of total reflection is θ=arcsin (N1/N2), wherein θ is the critical angle of total reflection, N1
It is specially the refractive index of air for the refractive index of optically thinner medium, in the present embodiment, N2 is the refractive index of close Jie of light, in the present embodiment
The specially Refractive Index of Material of total reflection lens 103.Under normal circumstances, the refractive index of the air of normal atmosphere pressure is about
1.00029, substituting into above-mentioned formula and the critical angle of the total reflection lens 103 can be calculated is about 30 degree to 41.8 degree.It should
Understand, the Refractive Index of Material of total reflection lens 103 is higher, then the degree of the critical angle with regard to smaller, can be all-trans
The light penetrated is more, and measurement result is more accurate.
In order to allow more light to be totally reflected, the Refractive Index of Material of total reflection lens 103 should be in a certain range
As high as possible, the Refractive Index of Material of total reflection lens 103 can be greater than 1.7 in the present embodiment.When the material of total reflection lens 103
When refractive index is 1.7, the critical angle of total reflection lens 103 is about 36 degree.
In a specific embodiment, total reflection lens 103 are hemispherical.And the diameter of each total reflection lens 103
It is 10 to 100 microns.The height of total reflection lens 103 is 5 to 50 microns, wherein the height of total reflection lens 103 is total reflection
Distance between lens 103 and the farthest point and cover board of cover board.In manufacturing process, 103 structure of total reflection lens can pass through nanometer
The means such as coining are formed in transparent substrates 102.
Further, total reflection lens 103 and fingerprint graph sensor in order to improve imaging effect, in the present embodiment
101 are arranged in a one-to-one correspondence.
Further, as shown in figure 5, the fingerprint recognition structure can also include radio-frequency fingerprint sensor 104A and/or surpass
Sound wave fingerprint sensor 104B, radio-frequency fingerprint sensor 104A and/or ultrasonic fingerprint sensor 104B are set to fingerprint graph
Sensor 101 is backwards to the side of transparent substrates 102.
Radio-frequency fingerprint sensor 104A and/or ultrasonic fingerprint sensor 104B is not intended to acquisition fingerprint in the present embodiment
Information, and mainly for detection of the authenticity of fingerprint.
It should be understood that fingerprint graph sensor 101 is to identify fingerprint according to light information, if other structures
After fitting with total reflection lens 103, it is also possible to so that light is generated frustrated total reflection, by the way that radio-frequency fingerprint sensor is arranged
104A and/or ultrasonic fingerprint sensor 104B, and according to radio-frequency fingerprint sensor 104A and/or ultrasonic fingerprint sensor
The testing result of 104B, it can be determined that whether the image that fingerprint graph sensor 101 is identified is true fingerprint image.
Radio-frequency fingerprint sensor 104A and/or ultrasonic fingerprint sensor 104B can refer to existing and change in the present embodiment
Into radio-frequency fingerprint sensor and/or ultrasonic fingerprint sensor, be not further qualified and describe herein, and since radio frequency refers to
Line sensor 104A and/or ultrasonic fingerprint sensor 104B is only used for the authenticity of verifying finger print information, therefore for its inspection
It is relatively low to survey required precision, is conducive to control production cost.
Second embodiment:
The present invention also provides a kind of display base plates.
As shown in fig. 6, the display base plate includes underlay substrate 601, the display device being formed on underlay substrate 601 602
With the transparent cover plate 603 being set on display device 602.
In the present embodiment, the structures such as underlay substrate 601 and display device 602 of display base plate can refer to existing and improve
Display base plate in associated components, will not be described further and limit herein.
Multiple total reflection lens 103 are formed on the transparent cover plate 603 of display base plate in the present embodiment, wherein this reality
Applying the total reflection lens 103 in example can refer to total reflection lens 103 in above-described embodiment, and set-up mode and principle are no longer superfluous
It states.
The display base plate can be acquired when matching with fingerprint graph sensor 101 by fingerprint graph sensor 101
Finger print information, to realize the lower fingerprint recognition of screen.
As shown in fig. 6, transparent cover plate 603 can be the transparent cover plate of the materials such as glass or resin production in the present embodiment
603, and 103 structure of total reflection lens is formed on surface
As shown in fig. 7, additional transparent cover plate 603, example can also be arranged on original glass cover-plate 604 of display base plate
As covered transparent cover plate 603 made of the materials such as a resin on original glass cover-plate 604 of display base plate, and it is transparent at this
Cover board upper mounted is at 103 structure of total reflection lens.
Further, it should be appreciated that due to be provided with 103 structure of total reflection lens, from the above analysis process it is found that
Light a part that display base plate issues can be across total reflection lens 103, some can be returned because of total reflection,
The display base plate can normally show image, and still, total reflection lens 103 may generate one to the display effect of display base plate
Fixed influence.
It further, can be to the shadow of the normal display effect of display base plate generation in order to reduce by 103 structure of total reflection lens
It rings, in the present embodiment, light transmission capacity can be adjusted by adjusting the distance between two neighboring total reflection lens 103 or passed through
Material of the selective refraction rate suitable material as total reflection lens 103 penetrates the light of total reflection lens 103 with reasonable control
With the ratio for the light being totally reflected, to balance display effect and fingerprint recognition effect.
3rd embodiment:
As shown in Figure 8 and Figure 9, the present invention also provides a kind of display device, including display base plate and any of the above-described
Fingerprint recognition structure, wherein fingerprint recognition structure can refer to the fingerprint recognition structure of above-mentioned first embodiment, and display base plate is then
It can be with reference to the display base plate in above-mentioned second embodiment.In the present embodiment, the transparent substrates 102 of fingerprint recognition structure are multiplexed with
The transparent cover plate 603 of display base plate.
In the present embodiment, total reflection lens 103 are formed on the transparent cover plate 603 of display base plate, in this way, display base plate
Transparent cover plate 603 is actually the transparent substrates 102 of fingerprint recognition structure.Above-described embodiment is specifically referred to, due to this reality
The technical solution for applying example includes whole technical solutions of above-described embodiment, therefore is at least able to achieve above-mentioned whole technical effects, this
Place repeats no more.
More than, only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, and it is any to be familiar with
Those skilled in the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all cover
Within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. a kind of fingerprint recognition structure, which is characterized in that multiple fingerprint graph sensors including array arrangement, the fingerprint image
Shape sensor is for obtaining fingerprint image；
It further include positioned at the transparent substrates of sensitive surface side of the fingerprint graph sensor and multiple in transparent substrates
Total reflection lens, the total reflection lens are for making from the transparent substrates close to fingerprint graph sensor side extremely
Few a part of light occurs to be totally reflected and returns to the transparent substrates close to fingerprint graph sensor side.
2. fingerprint recognition structure as described in claim 1, which is characterized in that the Refractive Index of Material of the total reflection lens is
1.5 to 2.0.
3. fingerprint recognition structure as claimed in claim 2, which is characterized in that the Refractive Index of Material of the total reflection lens is
1.7 to 2.0.
4. fingerprint recognition structure as described in claim 1, which is characterized in that the total reflection lens are hemispherical.
5. fingerprint recognition structure as claimed in claim 4, which is characterized in that the diameter of the total reflection lens is 10 to 100
Micron.
6. fingerprint recognition structure as claimed in claim 5, which is characterized in that the height of the total reflection lens is 5 to 50 micro-
Rice, wherein the height of the total reflection lens is farthest point of the total reflection lens apart from the transparent substrates and described
Distance between bright substrate.
7. fingerprint recognition structure as described in claim 1, which is characterized in that the total reflection lens and the fingerprint graph pass
Sensor corresponds.
8. fingerprint recognition structure as claimed in claim 7, which is characterized in that further include radio-frequency fingerprint sensor and/or ultrasound
Wave fingerprint sensor, the radio-frequency fingerprint sensor and/or ultrasonic fingerprint sensor are set to the fingerprint graph sensor
Backwards to the side of the transparent substrates.
9. a kind of display base plate, which is characterized in that including underlay substrate, the display device being formed on the underlay substrate and set
The transparent cover plate being placed on the display device, the transparent cover plate are formed with multiple total reflection lens, the total reflection lens
For making to occur to be totally reflected close at least part light of the display device side from the transparent cover plate and returning to institute
Transparent cover plate is stated close to the display device side.
10. a kind of display device, which is characterized in that know including display base plate and fingerprint described in any item of the claim 1 to 8
Other structure, wherein the transparent substrates of the fingerprint recognition structure are multiplexed with the transparent cover plate of the display base plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811026085.5A CN109255323B (en) | 2018-09-04 | 2018-09-04 | Fingerprint identification structure, display substrate and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811026085.5A CN109255323B (en) | 2018-09-04 | 2018-09-04 | Fingerprint identification structure, display substrate and display device |
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| CN109255323A true CN109255323A (en) | 2019-01-22 |
| CN109255323B CN109255323B (en) | 2021-01-22 |
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| US11440052B2 (en) | 2016-05-04 | 2022-09-13 | Invensense, Inc. | Two-dimensional array of CMOS control elements |
| US11651611B2 (en) | 2016-05-04 | 2023-05-16 | Invensense, Inc. | Device mountable packaging of ultrasonic transducers |
| US11154906B2 (en) | 2016-05-10 | 2021-10-26 | Invensense, Inc. | Receive operation of an ultrasonic sensor |
| US11626099B2 (en) | 2016-05-10 | 2023-04-11 | Invensense, Inc. | Transmit beamforming of a two-dimensional array of ultrasonic transducers |
| US11673165B2 (en) | 2016-05-10 | 2023-06-13 | Invensense, Inc. | Ultrasonic transducer operable in a surface acoustic wave (SAW) mode |
| US11288891B2 (en) | 2016-05-10 | 2022-03-29 | Invensense, Inc. | Operating a fingerprint sensor comprised of ultrasonic transducers |
| US11112388B2 (en) | 2016-05-10 | 2021-09-07 | Invensense, Inc. | Operation of an ultrasonic sensor |
| US11471912B2 (en) | 2016-05-10 | 2022-10-18 | Invensense, Inc. | Supplemental sensor modes and systems for ultrasonic transducers |
| US10860831B2 (en) | 2017-06-01 | 2020-12-08 | Invensense, Inc. | Image generation in an electronic device using ultrasonic transducers |
| US10997388B2 (en) | 2017-12-01 | 2021-05-04 | Invensense, Inc. | Darkfield contamination detection |
| US10984209B2 (en) | 2017-12-01 | 2021-04-20 | Invensense, Inc. | Darkfield modeling |
| US10936841B2 (en) | 2017-12-01 | 2021-03-02 | Invensense, Inc. | Darkfield tracking |
| US11151355B2 (en) | 2018-01-24 | 2021-10-19 | Invensense, Inc. | Generation of an estimated fingerprint |
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