CN110569798A - Line identification module, line identification device and display device - Google Patents
Line identification module, line identification device and display device Download PDFInfo
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- CN110569798A CN110569798A CN201910851352.0A CN201910851352A CN110569798A CN 110569798 A CN110569798 A CN 110569798A CN 201910851352 A CN201910851352 A CN 201910851352A CN 110569798 A CN110569798 A CN 110569798A
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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
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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
- G06V40/1347—Preprocessing; Feature extraction
- G06V40/1359—Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop
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Abstract
The application discloses line identification module, line identification device and display device for provide a line identification module based on total reflection principle, increase the application scene of line identification module simultaneously. The embodiment of the application provides a line identification module, line identification module includes: the light source comprises a light guide layer, an optical sensor layer and a light-transmitting cover plate which are sequentially stacked; the light guide layer has: a first surface facing the optical sensor layer, a second surface facing away from the optical sensor layer, and a side connecting the first surface and the second surface; the light source is positioned on the side face; on the side of the light-transmitting cover plate facing away from the optical sensor layer, the refractive index n0 of the medium adjacent to the light-transmitting cover plate is smaller than the refractive index n1 of the light-transmitting cover plate.
Description
Technical Field
The application relates to the technical field of grain identification, in particular to a grain identification module, a grain identification device and a display device.
Background
In recent years, application fields and identification modes of fingerprints are more and more extensive, various fingerprint identification schemes are available, for example, on a large-scale card punching machine, total reflection at a fingerprint valley is realized by using a prism structure, but the size of a fingerprint identification module of the scheme is limited by the size of the prism, so that the size of the whole fingerprint identification module is large, the application fields of the fingerprint identification module are greatly limited, and although the thickness of the fingerprint identification module is reduced by using optical fibers and other imaging structures, the cost of the fingerprint identification module is high. In summary, the application scenarios of the fingerprint identification module provided by the prior art are limited.
Disclosure of Invention
The embodiment of the application provides a line identification module, a line identification device and a display device, which are used for providing a line identification module based on a total reflection principle and increasing the application scene of the line identification module.
The embodiment of the application provides a line identification module, line identification module includes: the light source comprises a light guide layer, an optical sensor layer and a light-transmitting cover plate which are sequentially stacked; the light guide layer has: a first surface facing the optical sensor layer, a second surface facing away from the optical sensor layer, and a side connecting the first surface and the second surface; the light source is positioned on the side face; on the side of the light-transmitting cover plate facing away from the optical sensor layer, the refractive index n0 of the medium adjacent to the light-transmitting cover plate is smaller than the refractive index n1 of the light-transmitting cover plate.
The line identification module that this application embodiment provided, optical sensor layer and printing opacity apron pile up in proper order on leaded light layer, set up the light source in leaded light layer side, alright in order to realize the line identification, the simple structure of line identification module easily realizes, and the material of light source and other parts is acquireed easy with low costs. Because the line identification module that this application embodiment provided need not to set up the prism structure, line identification module size is unrestricted, and line identification module can be applied to small-size line identification, has increased the application scene of line identification module. The line identification module that this application embodiment provided, the protective layer of line must the module can also be regarded as to the printing opacity apron to can all realize the line discernment at arbitrary printing opacity apron thickness, therefore line identification module can be applied to ultra-thin product, also can be applied to the security protection field that needs thick printing opacity apron as the protective layer, has improved the application suitability of line identification module, has further increased the application scene of line identification module.
Optionally, the texture recognition module further includes: the light guide plate comprises a light guide layer, an optical sensor layer, a first light-transmitting adhesive and a second light-transmitting adhesive, wherein the first light-transmitting adhesive is located between the light guide layer and the optical sensor layer, and the second light-transmitting adhesive is located between the optical sensor layer and the light-transmitting cover plate.
The light guide layer and the optical sensor layer and the light-transmitting cover plate are laminated through the light-transmitting laminating adhesive, so that the adhesive force between the light guide layer and the optical sensor layer and between the optical sensor layer and the light-transmitting cover plate can be increased.
Optionally, the refractive index n5 of the light guide layer, the refractive index n4 of the first light-transmitting adhesive, the optical sensor layer n3, the refractive index n2 of the second light-transmitting adhesive, and the refractive index n1 of the light-transmitting cover plate satisfy the following conditions: n5 is not less than n4 is not less than n3 is not less than n2 is not less than n 1.
Optionally, the optical sensor layer comprises: a transparent substrate, and an array of optical sensor cells located over the transparent substrate; the optical sensor unit is divided into a light-transmitting area and a non-light-transmitting area, and the non-light-transmitting area includes a photosensor.
the line identification module that this application embodiment provided, the light that gets into the leaded light layer sees through the printing opacity district of sensor unit and incides the printing opacity apron, then goes out the plain noodles at the printing opacity apron, and the diffuse reflection takes place because the influence of the refracting index of ridge destroys the total reflection at the regional light of line ridge and the laminating of printing opacity apron, and the total reflection takes place owing to the existence of air in the region of line valley and printing opacity apron, and the light sensor that the light that reflects back incides the non-printing opacity district alright in order to carry out the line discernment. And, the line identification module that this application embodiment provided, on photosensitive sensor set up and leaded light layer, light propagated through the printing opacity district to can avoid light not shine the line and just absorbed by photosensitive sensor, can avoid the light cross talk, improve the degree of accuracy of line identification.
Optionally, the transparent substrate is reused as the light guiding layer.
The line identification module that this application embodiment provided will be used for forming photosensitive sensor's transparent substrate as the leaded light layer to can further simplify the structure of line identification module, save the cost, can also reduce the thickness of line identification module.
Optionally, the light-transmissive region surrounds at least part of the non-transmissive region.
optionally, a refractive index of a medium adjacent to the light guide layer on a side facing the light source is n6, and an incident angle θ of light emitted from the light source incident on the light guide layer satisfies:
optionally, the texture recognition module further includes: a reflection part including: a first reflection portion disposed opposite to the second surface, and a second reflection portion disposed opposite to the side surface in a region other than the light source.
The line identification module that this application embodiment provided is owing to be provided with reflection part to reflecting back leaded light layer light through light-transmitting zone can be by reflection part reflection, reapply to in the line discernment, thereby can improve the light utilization ratio.
The embodiment of the application provides a line recognition device, includes the above-mentioned line identification module that the embodiment of the application provided.
An embodiment of the present application provides a display device, the display device includes: the electroluminescent display panel and the grain identification module provided by the embodiment of the application; the electroluminescent display panel is reused as the light-transmitting cover plate.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a texture recognition module according to an embodiment of the present disclosure;
Fig. 2 is a schematic structural diagram of another texture recognition module according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another texture recognition module according to an embodiment of the present disclosure;
Fig. 4 is a schematic structural diagram of another texture recognition module according to an embodiment of the present disclosure;
Fig. 5 is a schematic structural diagram of another texture recognition module according to an embodiment of the present disclosure;
Fig. 6 is a schematic structural diagram of another texture recognition module according to an embodiment of the present disclosure;
Fig. 7 is a schematic diagram of a simulation result of a texture recognition module according to an embodiment of the present disclosure.
Detailed Description
The embodiment of the application provides a line identification module, as shown in fig. 1, the line identification module includes: the light source device comprises a light source 1, a light guide layer 2, an optical sensor layer 3 and a light-transmitting cover plate 4 which are sequentially stacked; the light guide layer has: a first surface 8 facing the optical sensor layer, a second surface 9 facing away from the optical sensor layer, and a side 10 connecting the first surface 8 and the second surface 9; the light source 1 is positioned at the side face 10; on the side of the light-transmitting cover plate 4 facing away from the optical sensor layer 3, the refractive index n0 of the medium 11 adjacent to the light-transmitting cover plate 4 is smaller than the refractive index n1 of the light-transmitting cover plate 4.
The line identification module that this application embodiment provided, because with the refracting index of the adjacent medium of printing opacity apron is less than the refracting index of printing opacity apron, consequently when the incident angle is greater than critical angle, total reflection can take place at the play plain noodles of printing opacity apron, as shown in fig. 1, contact when line 7 and printing opacity apron 4, there are other medium 11 between line 7 millet and printing opacity apron 4, total reflection still takes place, can launch diffuse transmission in the region of line 7 ridge, it is inhomogeneous to lead to the light that sensor layer 3 received like this, the place that the light intensity that sensor layer 3 received is big corresponds the millet of line, the ridge of line is corresponded in the place that the light intensity that the sensor layer received is weak, thereby the line identification module that this application embodiment provided can utilize the total reflection principle to carry out line identification.
The line identification module that this application embodiment provided, optical sensor layer and printing opacity apron pile up in proper order on leaded light layer, set up the light source in leaded light layer side, alright in order to realize the line identification, the simple structure of line identification module easily realizes, and the material of light source and other parts is acquireed easy with low costs. Because the line identification module that this application embodiment provided need not to set up the prism structure, line identification module size is unrestricted, and line identification module can be applied to the discernment of small-size line, has increased the application scene of line identification module. The line identification module that this application embodiment provided, the protective layer of line must the module can also be regarded as to the printing opacity apron to can all realize the line discernment at arbitrary printing opacity apron thickness, therefore line identification module can be applied to ultra-thin product, also can be applied to the security protection field that needs thick printing opacity apron as the protective layer, has improved the application suitability of line identification module, has further increased the application scene of line identification module.
Optionally, as shown in fig. 2, the texture recognition module further includes: the light guide plate comprises a first light-transmitting adhesive 5 located between the light guide layer 2 and the optical sensor layer 3, and a second light-transmitting adhesive 6 located between the optical sensor layer 3 and the light-transmitting cover plate 4.
The light guide layer and the optical sensor layer and the light-transmitting cover plate are laminated through the light-transmitting laminating adhesive, and the adhesive force between the light guide layer and the optical sensor layer and between the optical sensor layer and the light-transmitting cover plate can be increased.
optionally, the refractive index n5 of the light guide layer, the refractive index n4 of the first light-transmitting adhesive, the optical sensor layer n3, the refractive index n2 of the second light-transmitting adhesive, and the refractive index n1 of the light-transmitting cover plate satisfy the following conditions: n5 is not less than n4 is not less than n3 is not less than n2 is not less than n 1.
Optionally, a refractive index of a medium adjacent to the light guide layer on a side facing the light source is n6, and an incident angle θ of light emitted from the light source incident on the light guide layer satisfies:
next, taking the texture recognition module shown in fig. 2 as an example, light transmission of the texture recognition module provided in the embodiment of the present application is illustrated.
when the refractive index n6 of the medium facing one side of the light source and adjacent to the light guide layer is smaller than the refractive index n5 of the light guide layer, the light entering the light guide layer can be refracted, the light entering the light path diagram of the texture identification module is shown in fig. 2, wherein theta6Angle of refraction, θ, for light entering the light guide layer 25The incident angle, theta, of light entering the first adhesive 54Angle of refraction, θ, for light entering the first adhesive 53angle of refraction, θ, for light entering the optical sensor layer 32Angle of refraction, θ, for light entering the second laminating adhesive 61The angle of incidence, θ, of light incident on the medium 11 from the surface of the light-transmitting cover 40' is the refraction angle of the light ray from the transparent cover plate, and according to the refraction law, the refraction index and the corresponding angle of each film layer satisfy the following conditions: n6sin (θ) ═ n5sin (θ)6)，θ6+θ5＝90°，n5sin(θ5)＝n4sin(θ4)，n4sin(θ4)＝n3sin(θ3)，n3sin(θ3)＝n2sin(θ2)，n2sin(θ2)＝n1sin(θ1)，n1sin(θ1)＝n0sin(θ0') requires θ according to the conditions of total reflection0' > 90 DEG or more, to obtain theta1≥sin-1(n6/n1), and so on to give θ5≥sin-1(n/n5)；n6sin(θ)＝n5sin(θ6)；θ6+θ590 °, calculated to yield:So that the light source incident angle theta satisfiesWhen the cover plate is used, the light can be totally reflected on the light-emitting surface of the light-transmitting cover plate.
It should be noted that, in general, the medium in which the light source is disposed and the medium adjacent to the light-transmitting cover plate are both air, that is, n6 is equal to n0 is equal to 1, when the light-guiding layer is made of PMMA or glass, n5 is about 1.5, that is, θ is equal to or greater than 90 °, and the incident light of the light source in a normal environment medium can all satisfy the condition, and can perform texture recognition by using the total reflection principle.
The line identification module that this application embodiment provided, leaded light layer and printing opacity apron all can select the material that has high light transmittance, and the material on leaded light layer for example can be glass or Polymethyl Methacrylate (PMMA), and the material of printing opacity apron also can be glass or PMMA. The first light-transmitting adhesive and the second light-transmitting adhesive can be made of the same material, and the first light-transmitting adhesive and the second light-transmitting adhesive can be optical adhesive (OCA), for example. The light source may be, for example, a Light Emitting Diode (LED) or other side emitting light source, as long as the side of the light source facing the side of the light guiding layer can emit light.
Alternatively, as shown in fig. 3, the optical sensor layer 3 includes: a transparent substrate 12, and an array of optical sensor cells 13 located over the transparent substrate 12; a top view of an array of optical sensor units 13 is shown in fig. 4, each of which is divided into a light-transmissive region 14 and a non-light-transmissive region 15, the non-light-transmissive region 15 comprising a light-sensitive sensor (not shown).
The line identification module that this application embodiment provided, the light that gets into the leaded light layer sees through the printing opacity district of sensor unit and incides the printing opacity apron, then goes out the plain noodles at the printing opacity apron, and the diffuse reflection takes place because the influence of the refracting index of ridge destroys the total reflection at the regional light of line ridge and the laminating of printing opacity apron, and the total reflection takes place owing to the existence of air in the region of line valley and printing opacity apron, and the light sensor that the light that reflects back incides the non-printing opacity district alright in order to carry out the line discernment. And, the line identification module that this application embodiment provided, on photosensitive sensor set up and leaded light layer, light propagated through the printing opacity district to can avoid light not shine the line and just absorbed by photosensitive sensor, can avoid the light cross talk, improve the degree of accuracy of line identification.
Alternatively, as shown in fig. 4, in each of the optical sensor units 13, the light-transmitting area 14 surrounds at least a portion of the non-light-transmitting area 15.
The photosensitive area of the photosensor may be disposed, for example, in an area surrounded by the light-transmitting area. Of course, the light-transmitting area and the non-light-transmitting area in the optical sensor unit may also adopt other arrangement modes, and the application is not limited.
Alternatively, as shown in fig. 5, the transparent substrate 12 is multiplexed into the light guide layer 2.
The line identification module that this application embodiment provided will be used for forming photosensitive sensor's transparent substrate as the leaded light layer, can save the leaded light layer, can also save first printing opacity laminating and glue to can further simplify the structure of line identification module, save the cost, can also reduce the thickness of line identification module.
Optionally, as shown in fig. 6, the texture recognition module further includes: a reflection section 16; the reflection section 16 includes: a first reflection portion 17 disposed opposite to the second surface, and a second reflection portion 18 disposed opposite to the side surface in an area other than the light source.
In fig. 6, the first reflection part and the second reflection part are illustrated as being connected, but in the specific implementation, the first reflection part and the second reflection part may be provided separately.
The line identification module that this application embodiment provided is owing to be provided with reflection part to reflecting back leaded light layer light through light-transmitting zone can be by reflection part reflection, reapply to in the line discernment, thereby can improve the light utilization ratio.
Alternatively, the texture may be a fingerprint or a palm print. The line identification module that this application embodiment provided promptly can discern the fingerprint, also can discern the palm print.
The grain identification module provided by the embodiment of the application is simulated by using optical modeling (lighttools) software, the thickness of the light-transmitting cover plate is 0.3 millimeter (mm), the thickness of the photosensitive sensor unit is 0.5mm, the thicknesses of the first transparent adhesive tape and the second transparent adhesive tape are both 0.1mm, and the thickness of the light guide layer is 2 mm; the grain covering area, the area of the optical sensor unit array and the area of the light guide layer are all 25 multiplied by 25mm2The size of the transparent cover plate is 45mm multiplied by 45mm2The receiving area of the sensor is 0.41mm from the ridge; the refracting index of each printing opacity rete of line identification module is 1.5, the refracting index of the medium at line and light source place is 1, the light source sets up the left side at the leaded light layer, the downside and the right side of light guide plate are provided with the reflection part, 10 hundred million light rays of simulation carry out the analysis, obtain like the photosensitive sensor that fig. 7 carried out the illuminance map of sensitization, abscissa in fig. 7 is photosensitive sensor's position, the ordinate represents the illuminance of photosensitive sensor sensitization, can see out in fig. 7 that photosensitive sensor carries out the illuminance of sensitization and the valley of line, the ridge corresponds.
The embodiment of the application provides a line recognition device, includes the above-mentioned line identification module that the embodiment of the application provided.
An embodiment of the present application provides a display device, the display device includes: the electroluminescent display panel and the grain identification module provided by the embodiment of the application; the electroluminescent display panel is reused as the light-transmitting cover plate.
the line discernment module that this application embodiment provided can also be applied to the line discernment that shows the product promptly, when concrete implementation, can mark off the regional region as the line discernment in electroluminescent display panel's printing opacity district, and set up other structures of the line discernment module except that printing opacity apron in line discernment region.
To sum up, line identification module, line identification device and display device that this application embodiment provided, optical sensor layer and printing opacity apron pile up in proper order on the leaded light layer, set up the light source in leaded light layer side, alright in order to realize the line discernment, the simple structure of line identification module easily realizes, and the material of light source and other parts is acquireed easy with low costs. Because the line identification module that this application embodiment provided need not to set up the prism structure, line identification module size is unrestricted, and line identification module can be applied to small-size line identification, has increased the application scene of line identification module. The line identification module that this application embodiment provided, the protective layer of line must the module can also be regarded as to the printing opacity apron to can all realize the line discernment at arbitrary printing opacity apron thickness, therefore line identification module can be applied to ultra-thin product, also can be applied to the security protection field that needs thick printing opacity apron as the protective layer, has improved the application suitability of line identification module, has further increased the application scene of line identification module.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (10)
1. The utility model provides a line identification module, its characterized in that, line identification module includes: the light source comprises a light guide layer, an optical sensor layer and a light-transmitting cover plate which are sequentially stacked; the light guide layer has: a first surface facing the optical sensor layer, a second surface facing away from the optical sensor layer, and a side connecting the first surface and the second surface; the light source is positioned on the side face; on the side of the light-transmitting cover plate facing away from the optical sensor layer, the refractive index n0 of the medium adjacent to the light-transmitting cover plate is smaller than the refractive index n1 of the light-transmitting cover plate.
2. The texture recognition module of claim 1, further comprising: the light guide plate comprises a light guide layer, an optical sensor layer, a first light-transmitting adhesive and a second light-transmitting adhesive, wherein the first light-transmitting adhesive is located between the light guide layer and the optical sensor layer, and the second light-transmitting adhesive is located between the optical sensor layer and the light-transmitting cover plate.
3. The texture recognition module set according to claim 2, wherein the refractive index n5 of the light guide layer, the refractive index n4 of the first light-transmitting adhesive, the refractive index n3 of the optical sensor layer, the refractive index n2 of the second light-transmitting adhesive, and the refractive index n1 of the light-transmitting cover plate satisfy the following conditions: n5 is not less than n4 is not less than n3 is not less than n2 is not less than n 1.
4. The texture recognition module of claim 1, wherein the optical sensor layer comprises: a transparent substrate, and an array of optical sensor cells located over the transparent substrate; the optical sensor unit is divided into a light-transmitting area and a non-light-transmitting area, and the non-light-transmitting area includes a photosensor.
5. The texture recognition module of claim 4, wherein the transparent substrate is reused as the light guide layer.
6. The texture recognition module of claim 4, wherein the light-transmissive region surrounds at least a portion of the non-light-transmissive region.
7. The grain identification module of claim 1, wherein a refractive index of a medium adjacent to the light guide layer on a side facing the light source is n6, and an incident angle θ of light emitted from the light source incident on the light guide layer satisfies:
8. The texture recognition module of claim 1, further comprising: a reflection part including: a first reflection portion disposed opposite to the second surface, and a second reflection portion disposed opposite to the side surface in a region other than the light source.
9. a grain recognition device, comprising the grain recognition module according to any one of claims 1 to 8.
10. A display device, characterized in that the display device comprises: an electroluminescent display panel and the grain recognition module according to any one of claims 1 to 8; the electroluminescent display panel is reused as the light-transmitting cover plate.
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| CN201910851352.0A CN110569798A (en) | 2019-09-10 | 2019-09-10 | Line identification module, line identification device and display device |
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| CN201910851352.0A CN110569798A (en) | 2019-09-10 | 2019-09-10 | Line identification module, line identification device and display device |
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| CN111444842A (en) * | 2020-03-26 | 2020-07-24 | 维沃移动通信有限公司 | Display assembly and electronic equipment |
| WO2021138781A1 (en) * | 2020-01-06 | 2021-07-15 | 深圳市汇顶科技股份有限公司 | Fingerprint detection device and electronic device |
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| CN207636881U (en) * | 2018-01-02 | 2018-07-20 | 京东方科技集团股份有限公司 | A kind of display device |
| CN110008945A (en) * | 2019-04-04 | 2019-07-12 | 京东方科技集团股份有限公司 | A kind of lines identification mould group and preparation method thereof, display device |
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| CN111126342B (en) * | 2019-12-31 | 2022-10-28 | 厦门天马微电子有限公司 | Display panel and display device |
| WO2021138781A1 (en) * | 2020-01-06 | 2021-07-15 | 深圳市汇顶科技股份有限公司 | Fingerprint detection device and electronic device |
| CN111444842A (en) * | 2020-03-26 | 2020-07-24 | 维沃移动通信有限公司 | Display assembly and electronic equipment |
| CN111444842B (en) * | 2020-03-26 | 2024-01-26 | 维沃移动通信有限公司 | Display assembly and electronic equipment |
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