WO2018113126A1 - Dispositif d'identification biométrique - Google Patents

Dispositif d'identification biométrique Download PDF

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Publication number
WO2018113126A1
WO2018113126A1 PCT/CN2017/078492 CN2017078492W WO2018113126A1 WO 2018113126 A1 WO2018113126 A1 WO 2018113126A1 CN 2017078492 W CN2017078492 W CN 2017078492W WO 2018113126 A1 WO2018113126 A1 WO 2018113126A1
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WO
WIPO (PCT)
Prior art keywords
light
component
openings
assembly
absorbing layer
Prior art date
Application number
PCT/CN2017/078492
Other languages
English (en)
Chinese (zh)
Inventor
王炯翰
Original Assignee
创智能科技股份有限公司
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Filing date
Publication date
Application filed by 创智能科技股份有限公司 filed Critical 创智能科技股份有限公司
Publication of WO2018113126A1 publication Critical patent/WO2018113126A1/fr

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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
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition

Definitions

  • the invention relates to a biometric identification device.
  • the types of biometrics include face, sound, iris, retina, vein, fingerprint, and palmprint recognition. Since each person's fingerprint is unique and the fingerprint is not easy to change with age or physical health, the fingerprint identification device has become the most popular biometric identification device. According to the different sensing methods, the fingerprint identification device can be divided into optical and capacitive. When the capacitive fingerprint identification device is assembled in an electronic product (for example, a mobile phone or a tablet computer), a cover lens is disposed above the capacitive fingerprint identification device. In general, additional processing (eg, drilling or thinning) of the protective component is required to enable the capacitive fingerprinting device to sense a change in capacitance or electric field caused by a finger touch.
  • an electronic product for example, a mobile phone or a tablet computer
  • the optical fingerprint identification device captures light that easily penetrates the protection component for fingerprint recognition, and can eliminate the need for additional processing of the protection component, thereby facilitating the combination with the electronic product.
  • the optical fingerprint identification device generally includes a light source, an image capturing component, and a light transmitting component.
  • the light source is used to emit a light beam to illuminate a finger pressed against the light transmissive component.
  • Finger fingerprints are made up of a number of irregular ridges and indentations.
  • the beams reflected by the ridges and the indentations are formed as a fingerprint image of the light and dark interlaced on the receiving surface of the image capturing assembly.
  • the image capturing component can convert the fingerprint image into corresponding image information and input the image information into the processing unit.
  • the processing unit may use an algorithm to calculate image information corresponding to the fingerprint for identification of the user.
  • the light beam reflected by the fingerprint is easily transmitted to the image capturing component, which results in poor image quality and affects the identification result.
  • the invention provides a biometric identification device.
  • the biometric device comprises a light source, a light guiding component, an image capturing component and a first collimator.
  • the light source is adapted to provide a light beam.
  • the light guiding component is located on the transmission path of the light beam.
  • the image capture component is located below the light guide component and has a plurality of pixel regions.
  • the first collimator is located between the light guiding component and the image capturing component, wherein the first collimator comprises a first collimating component and a second collimating component.
  • the first collimating assembly includes a first light transmissive component, a first light absorbing layer, and a plurality of lens components.
  • the first light absorbing layer is disposed on the first light transmissive component and has a plurality of first openings that overlap the pixel area.
  • the lens assembly is disposed on the first light transmissive component and is respectively located in one of the first openings.
  • the second collimating assembly includes a light absorbing assembly. The light absorbing component and the first opening are respectively located in the first light transmissive component Opposite sides, and the light absorbing assembly has a plurality of second openings that overlap the first opening.
  • the light guiding member has a light exiting portion and a light incident portion connected to the light exiting portion.
  • the light source and the image capturing component are located below the light exiting portion.
  • the light incident portion is located between the light source and the light exit portion.
  • the light guiding member is formed with a plurality of microstructures facing the surface of the first collimator.
  • the microstructure is convex or concave on the surface.
  • the height ratio of the aperture of each of the first openings to the first light transmissive component falls within a range of 2 to 20.
  • the light absorbing member is a second light absorbing layer.
  • the second light absorbing layer is located between the first light transmissive component and the image capturing component, and the second opening is formed in the second light absorbing layer.
  • the ratio of the aperture of each of the second openings to the height of the first light transmissive component falls within a range of 2 to 20.
  • the aperture of the second opening is smaller than or equal to the aperture of the first opening.
  • the second collimating assembly further includes a second light transmitting component and a third light absorbing layer.
  • the second light-transmitting component is located between the second light-absorbing layer and the image capturing component, and the third light-absorbing layer and the second light-absorbing layer are respectively located on opposite sides of the second light-transmitting component.
  • the third light absorbing layer has a plurality of third openings that overlap the second opening.
  • the aperture of the first opening is greater than or equal to the aperture of the second opening, and the aperture of the second opening is greater than or equal to the aperture of the third opening.
  • the second collimating assembly further includes a plurality of second light transmissive components.
  • the second light transmissive component is disposed in the second opening, wherein the refractive index of the second light transmissive component falls within a range of 1.3 to 1.7, respectively, and the height ratio of the aperture of each of the second openings to the second light transmissive component falls within 2 To the range of 20.
  • the biometric device further includes a second collimator.
  • the second collimator is located between the light guiding component and the first collimator.
  • the second collimator includes a plurality of prisms. The apex angles of the prisms are respectively directed to the light guiding components.
  • the light beam transmitted to the image capturing component is collimated by the first collimating component and the second collimating component, so that the image capturing quality of the image capturing component is obtained. Upgrade. Therefore, the biometric device can have good recognition capabilities.
  • FIG. 1 is a schematic cross-sectional view of a biometric device according to an embodiment of the present invention
  • Figure 2 is an enlarged view of the light guiding assembly of Figure 1;
  • FIG. 3 is a schematic view of the first collimating assembly of the first collimator of FIG. 1;
  • FIG. 4 is a first cross-sectional view of the first collimator, the image capturing assembly, and the circuit board of FIG. 1;
  • Figure 5 is an enlarged view of the light guiding assembly and the second collimator of Figure 1;
  • FIG. 6 is a cross-sectional view showing a biometric device according to another embodiment of the present invention.
  • FIGS. 7 to 9 are second to fourth cross-sectional views of the first collimator, the image capturing assembly, and the circuit board of FIGS. 1 and 6, respectively;
  • Figure 10 is a bottom plan view of the first collimating assembly of the first collimator of Figure 9.
  • 100, 100A biometric identification device
  • 120, 120A light guiding component
  • 140, 140A, 140B, 140C first collimator
  • B, B', B1', B2' light beam
  • H1, H2 height
  • PR pixel area
  • S1421C, S1442C side wall surface
  • W1442 width
  • WO1, WO2, WO3 pore size.
  • the biometric device 100 is, for example, a fingerprint identification device for identifying the fingerprint of the object 10 to be identified, but is not limited thereto. In another embodiment, the biometric device 100 can also be used to identify a combination of at least two of a vein, a palm print, or a fingerprint, a vein, and a palm print.
  • the biometric device 100 includes a light source 110, a light guiding component 120, an image capturing component 130, and a first collimator 140.
  • Light source 110 is adapted to provide beam B.
  • Light source 110 can be a non-visible light source or a visible light source. That is, the light beam B may be invisible light (eg, infrared light) or visible light (eg, red light, blue light, green light, or a combination thereof).
  • light source 110 can be a combination of a non-visible light source and a visible light source.
  • light source 110 can include a plurality of light emitting components 112.
  • Light emitting component 112 can be a light emitting diode or other suitable type of light emitting component.
  • FIG. 1 schematically shows two lighting assemblies 112 with two lighting assemblies 112 on opposite sides of the image capturing assembly 130. However, the number and arrangement of the light-emitting components 112 can be changed as needed, and is not limited thereto.
  • the light guiding component 120 is located on the transmission path of the light beam B, and is adapted to direct the light beam B provided by the light source 110 to the object to be recognized 10.
  • the material of the light guiding component 110 can be glass, polycarbonate (PC), polymethyl methacrylate (PMMA) or other suitable materials.
  • the light source 110 and the image capturing component 130 are located on the same side of the light guiding component 120.
  • the biometric device 100 further includes a circuit board 150.
  • the light source 110 is disposed on the circuit board 150 and is electrically connected to the circuit board 150.
  • the light guiding component 120 has a light exiting portion 122 and at least one light incident portion 124 connected to the light exiting portion 122.
  • the light source 110 and the image capturing component 130 are located under the light exiting portion 122 , and the light source 110 is located beside the image capturing component 130 .
  • the light incident portion 124 is located between the light source 110 and the light exit portion 122.
  • the light incident portion 124 may be fixed to the circuit board 150, and the light incident portion 124 has a recess C.
  • the recess C and the circuit board 150 enclose a space in which the light source 110 is housed.
  • at least one of the light incident portion 124 and the circuit board 150 may have a recess (not shown) to accommodate the light source 110.
  • the light incident portion 124 and the circuit board 150 may be fixed together by a fixing mechanism (not shown) or an adhesive layer (not shown, for example, an optical glue).
  • the light incident portion 124 can be adhered by an adhesive layer (not shown, for example
  • the optical glue is fixed on the light source 110, and the light incident portion 124 may not be in contact with the circuit board 150.
  • FIG. 1 schematically shows two light incident portions 124, and the two light incident portions 124 are located on opposite sides of the light exit portion 122. However, the number and arrangement of the light incident portions 124 can be changed as needed, and is not limited thereto.
  • FIG. 2 is an enlarged view of the light guiding assembly of FIG. 1.
  • the light beam B emitted from the light source 110 enters the light guide unit 120 from the light incident portion 124 , and the light beam B can be transmitted to the light exit portion 122 via the light incident portion 124 .
  • the surface S of the light guiding component 120 facing the first collimator 140 can be selectively formed with a plurality of microstructures M (not shown in FIG. 1 , please refer to FIG. 2 ).
  • the microstructure M is adapted to change the direction of transmission of the beam B such that the beam B reflected by the microstructure M is directed perpendicularly or nearly perpendicularly out of the exit portion 122. As shown in FIG.
  • the microstructure M may protrude from the surface S and may have a first reflective surface S1 and a second reflective surface S2.
  • the first reflective surface S1 and the second reflective surface S2 are connected to each other, wherein the first reflective surface S1 and the second reflective surface S2 are inclined with respect to the surface S, and the oblique directions of the first reflective surface S1 and the second reflective surface S2 are opposite.
  • the microstructure M, the light exit portion 122, and the light incident portion 124 may be integrally formed, but not limited thereto.
  • the microstructures M, the light exiting portion 122, and the light incident portion 124 can be separately fabricated and fixed together by a connecting mechanism or an adhesive layer (for example, an optical adhesive).
  • the microstructure M can also be recessed into the surface S.
  • the microstructure M may be a depression formed on the surface S.
  • the number of microstructures M and their distribution may vary according to different needs, and are not limited to the number and distribution shown in FIG.
  • the surface S' of the light-emitting portion 122 outputting the light beam B is opposed to the surface S on which the microstructure M is formed.
  • the surface S' may be a pressing surface for pressing the object to be recognized 10.
  • TIR total internal reflection
  • the biometric device 100 may further include a cover plate 160 for the object 10 to be pressed.
  • the cover plate 160 is located above the light guide assembly 120 , and the light guide assembly 120 is located between the cover plate 160 and the first collimator 140 .
  • the cover plate 160 may be a cover lens of an electronic product to be assembled (for example, a touch panel or a touch display panel), but is not limited thereto.
  • the cover plate 160 and the light guide assembly 120 may be fixed together by a connecting mechanism or an adhesive layer (for example, an optical adhesive), but not limited thereto.
  • the refractive index of the adhesive layer, the cover plate 160 and the light guiding component 120 may be the same or similar to reduce the interface reflection, thereby improving the light utilization of the biometric device 100. Efficiency and / or image quality.
  • the refractive indices of the adhesive layer, cover plate 160, and light directing component 120 can also be different. Under the structure in which the cover plate 160 is disposed, the light beam B from the light source 110 sequentially passes through the light-emitting portion 122 and the cover plate 160 of the light-receiving portion 124, and total internal reflection occurs on the surface of the cover plate 160 where the object to be recognized 10 is pressed.
  • the light beam B' acting (e.g., diffused) by the object 10 to be identified passes through the cover plate 160 and the light exit portion 122 in sequence and is transmitted to the surface S.
  • a portion of the light beam B' transmitted to the surface S is reflected by the surface S, and is again transmitted toward the surface of the cover plate 160 where the object 10 is to be pressed.
  • another portion of the light beam B' delivered to the surface S will exit the light guide assembly 120 from the surface S.
  • the image capturing component 130 is located below the light guiding component 120 and has a plurality of arrays, for example, arranged in an array A pixel area PR (shown in Fig. 4) is received to receive the light beam B' acting through the object to be recognized 10, thereby obtaining an image of the object 10 to be recognized.
  • the image capturing component 130 includes, for example, a plurality of Charge-Coupled Devices (CCDs) 132 (shown in FIG. 4).
  • the charge coupled assembly 132 is disposed on the circuit board 150 and is electrically coupled to the circuit board 150.
  • the area of the charge coupled component 132 is the pixel area PR of the image capture component 130.
  • the image capturing component 130 can include a plurality of complementary metal oxide semiconductors (CMOSs), and the region of the complementary metal oxide semiconductor is the pixel region PR of the image capturing component 130.
  • CMOSs complementary metal oxide semiconductors
  • the first collimator 140 is located between the light guiding component 120 and the image capturing component 130, and the first collimator 140 is located on the transmission path of the light beam B' after the object 10 is to be recognized.
  • the first collimator 140 can be disposed on the image capturing component 130, and the first collimator 140 and the image capturing component 130 can be fixed by a connecting mechanism or an adhesive layer (eg, optical glue). Together, but not limited to this.
  • the first collimator 140 includes a first collimating assembly 142 and a second collimating assembly 144 that overlaps the first collimating assembly 142 .
  • the first collimating assembly 142 includes a first light transmissive component 1421, a first light absorbing layer 1422, and a plurality of lens components 1423.
  • the material of the first light transmissive component 1421 may be glass, polycarbonate (PC), polymethyl methacrylate (PMMA) or other suitable materials.
  • the first light absorbing layer 1422 is disposed on the first light transmissive component 1421 and has a plurality of first openings O1 overlapping the pixel regions PR.
  • the lens assembly 1423 is disposed on the first light transmissive component 1421 and is respectively located in one of the first openings O1.
  • the second collimating assembly 144 includes a light absorbing assembly 1441.
  • the light absorbing component 1441 and the first opening O1 are respectively located on opposite sides of the first light transmitting component 1421, and the light absorbing component 1441 has a plurality of second openings O2 overlapping the first opening O1.
  • the first light absorption layer 1422 is disposed on the surface S1421A of the first light transmissive component 1421.
  • the light absorbing member 1441 is a second light absorbing layer.
  • the second light absorbing layer ie, the light absorbing component 1441
  • the second light absorbing layer is disposed, for example, on the surface S1421B of the first light transmitting component 1421 facing the image capturing component 130.
  • the second opening O2 is formed in the second light absorbing layer.
  • first light absorbing layer 1422 and the second light absorbing layer may be further disposed on the sidewall surface S1421C of the first light transmissive component 1421 to prevent the light beam transmitted in the first light transmissive component 1421 from being emitted from the sidewall surface S1421C, but not This is limited to this.
  • the first light absorbing layer 1422 and the second light absorbing layer may not be disposed on the sidewall surface S1421C of the first light transmissive component 1421.
  • the lens assembly 1423 disposed on the light incident side of the first collimator 140 is adapted to concentrate the light beam B' acting through the object to be recognized 10 and passing through the light guiding component 120, thereby helping to allow more of the light beam B' to be transmitted to Image capture component 130.
  • the material of the first light absorbing layer 1422 and the second light absorbing layer may be, for example, a silica gel type, an acrylic type or a photoresist material containing a light absorbing material (for example, carbon) to absorb large.
  • the light beam of the first light transmitting component 1421 is incident at an angle.
  • the first collimating component 142 can be utilized.
  • the light absorbing assembly 1441 between the image capturing assemblies 130 absorbs the incident light beam at a large angle, and only passes the small angle incident light beam to the image capturing assembly 130.
  • the first light absorbing layer 1422 and the second light absorbing layer may be formed of the same material and patterned by the same manufacturing process, but not limited thereto. In another embodiment, the first light absorbing layer 1422 and the second light absorbing layer may be formed of different materials and formed in different manufacturing processes.
  • the light absorbing component 1441 may depend on the aperture WO1 of the first opening O1, the aperture WO2 of the second opening O2, and the first through The height H1 of the light assembly 1421 and the angle of refraction of the light beam B' at the surface S1421A of the first light transmitting member 1421 (determined by the incident angle of the light beam B' and the refractive index of the first light transmitting member 1421) and the like.
  • the larger the aperture WO1 of the first opening O1 and the aperture WO2 of the second opening O2 the larger the angular range of the light beam B' received by the image capturing component 130. Big.
  • the aperture WO1 of the first opening O1 and the aperture WO2 of the second opening O2 are constant values, the larger the height H1 of the first light transmissive component 1421, the greater the angular range of the light beam B' received by the image capturing component 130. small.
  • the refraction angle of the beam B' is larger (that is, the incident angle is larger), The more likely it is absorbed by the first light absorbing layer 1422 and the second light absorbing layer (ie, the light absorbing component 1441).
  • the refractive index of the first light transmissive component 1421 is greater than 1, and falls, for example, in the range of 1.3 to 1.7.
  • the aperture WO1 of each of the first openings O1 and the height H1 of the first light transmissive component 1421 fall within a range of 2 to 20.
  • the aperture WO2 of each of the second openings O2 and the height H1 of the first light transmissive component 1421 fall within a range of 2 to 20.
  • the refractive index of the first light transmissive component 1421, the ratio of the aperture WO1 of each first opening O1 to the height H1 of the first light transmissive component 1421, and the aperture WO2 of each second opening O2 and the height H1 of the first light transmissive component 1421 may vary depending on different design requirements (eg, the pitch of the image capture component 130), and is not limited to the above.
  • the first light absorbing layer 1422 and the second light absorbing layer ie, the light absorbing component 1441
  • the first light absorbing layer 1422 and the second light absorbing layer ie, the light absorbing component 1441
  • the first collimator 140 By appropriately modulating the aperture WO1 of the first opening O1 and the aperture WO2 of the second opening O2, the light beam passing through the first collimator 140 can be incident on the image capturing assembly 130 at an angle of 0 degrees or close to 0 degrees.
  • the first collimator 140 facilitates collimating the beam that is transmitted to the image capture assembly 130.
  • the biometric device 100 can have good recognition capabilities.
  • the aperture WO1 of the first opening O1 and the aperture WO2 of the second opening O2 may be the same, and the first opening O1 and the second opening O2 are aligned with the pixel area PR so as to sequentially pass through the first opening O1.
  • the light beam of the second opening O2 can be transmitted to the image capturing assembly 130.
  • the shape of the first opening O1 and the second opening O2 is, for example, a circle, but is not limited thereto. In other implementations In the example, the shape of the first opening O1 and the second opening O2 may also be a triangle, a quadrangle, a pentagon or other polygons.
  • the size of the pixel region PR may be slightly larger than the aperture WO1 of the first opening O1 and the aperture WO2 of the second opening O2, but not limited thereto.
  • Biometric device 100 may also include other components depending on various needs.
  • biometric device 100 can also include a second collimator 170.
  • the second collimator 170 is located between the light guiding component 120 and the first collimator 140, and the second collimator 170 is located on the transmission path of the light beam B' after the object 10 is to be recognized.
  • the second collimator 170 can be disposed on the surface S, and the light guiding component 120 and the second collimator 170 can be fixed together by a connecting mechanism or an adhesive layer (eg, optical glue), but not This is limited to this.
  • the second collimator 170 is adapted to pre-align the beam B' before the beam B' passes through the first collimator 140 (or the first collimator 140A) to converge the divergence angle of the beam B'. As such, the probability of subsequent passage of beam B' through first collimator 140 (or first collimator 140A) can be increased.
  • FIG. 5 is an enlarged view of the light guiding assembly and the second collimator of FIG. 1.
  • the second collimator 170 may include a plurality of prisms 172 , and the vertex angles TA of the prisms 172 refer to the light guide components 120 , respectively. In the present embodiment, the angles of the two bottom corners BA of the respective prisms 172 are the same. However, the apex angle TA and the bottom angle BA of the prism 172 may vary according to different needs, and are not limited thereto.
  • FIG. 6 is a cross-sectional view of a biometric device according to another embodiment of the present invention.
  • the biometric device 100A of FIG. 6 is similar to the biometric device 100 of FIG. 1, and the biometric device 100A has similar functions and advantages as the biometric device 100, and will not be repeated here.
  • the difference between the biometric device 100A of FIG. 6 and the biometric device 100 of FIG. 1 is that the position of the light source 110 is different.
  • the light source 110 is located on the side of the light guide assembly 120A.
  • the light guiding component 120A is, for example, a plate shape, and the light guiding component 120A can omit the light incident portion 124 of the light guiding component 120 of FIG. 1 .
  • FIGS. 7 to 9 are second to fourth cross-sectional views of the first collimator, the image capturing assembly, and the circuit board of FIGS. 1 and 6, respectively.
  • Figure 10 is a bottom plan view of the first collimating assembly of the first collimator of Figure 9.
  • the first collimator 140A of FIG. 7 is similar to the first collimator 140 of FIG. 4, and the first collimator 140A has similar efficacy and advantages as the first collimator 140, and will not be repeated here.
  • the difference between the first collimator 140A of FIG. 7 and the first collimator 140 of FIG. 4 is as follows.
  • the aperture WO2 of the second opening O2 is equal to the aperture WO1 of the first opening O1.
  • the aperture WO2 of the second opening O2 is smaller than the aperture WO1 of the first opening O1.
  • the aperture WO2 of the second opening O2 of the second light absorbing layer i.e., the light absorbing assembly 1441 of the second collimating assembly 144A
  • the first collimator 140B of FIG. 8 is similar to the first collimator 140 of FIG. 4, and the first collimator 140B has similar functions and advantages as the first collimator 140, and will not be repeated here.
  • the difference between the first collimator 140B of FIG. 8 and the first collimator 140 of FIG. 4 is as follows.
  • the second collimating assembly 144B further includes a second light transmissive component 1442 and a third light absorbing layer 1443.
  • the second light transmissive component 1442 is located at the second light absorbing layer (ie, the light absorbing component 1441 ) and the image capturing component 130 between.
  • the third light absorbing layer 1443 and the second light absorbing layer are respectively located on opposite sides of the second light transmitting component 1442.
  • the first light absorbing layer 1422 and the second light absorbing layer are respectively disposed on the opposite surfaces S1421A and S1421B of the first light transmitting component 1421, and the third light absorbing layer 1443 is disposed in the first surface.
  • the two light transmissive components 1442 are facing the surface S1442A of the image capturing assembly 130.
  • the second light transmissive component 1442 can be fixed to one side of the first light transmissive component 1421 and formed with the second light absorbing layer (ie, the light absorbing component 1441) by a connecting mechanism or an adhesive layer (for example, an optical adhesive), but limit.
  • the second light absorbing layer (ie, the light absorbing component 1441) and the third light absorbing layer 1443 are respectively disposed on the opposite surfaces S1442B and S1442A of the second light transmitting component 1442, and the first light transmitting component 1421 It may be fixed to one side of the second light-transmitting component 1442 by the connecting mechanism or the adhesive layer (for example, optical glue) to form the second light-absorbing layer.
  • the second light absorbing layer may be pre-formed on the third light transmissive component (not shown), and the third light transmissive component may be fixed to the first light transmissive component 1421 by a connecting mechanism or an adhesive layer. Between the second light transmissive components 1442.
  • the third light absorbing layer 1443 can be further disposed on the sidewall surface S1442C of the second light transmissive component 1442, but is not limited thereto.
  • the third light absorbing layer 1443 has a plurality of third openings O3 overlapping the second opening O2.
  • the aperture WO1 of the first opening O1 may be greater than or equal to the aperture WO2 of the second opening O2, and the aperture WO2 of the second opening O2 may be greater than or equal to the aperture WO3 of the third opening O3.
  • the aperture WO1 of the first opening O1, the aperture WO2 of the second opening O2, and the aperture WO3 of the third opening O3 are the same.
  • the first opening O1, the second opening O2, and the third opening O3 have the same or substantially the same shape and size. The so-called substantially identical shape and size are errors in consideration of the manufacturing process.
  • the shape of the first opening O1, the second opening O2, and the third opening O3 may be a circle, a triangle, a quadrangle, a pentagon, or other polygons.
  • the first opening O1, the second opening O2, and the third opening O3 are aligned with the pixel area PR, so that the light beams sequentially passing through the first opening O1, the second opening O2, and the third opening O3 can be transmitted to the image capturing assembly. 130.
  • the material of the third light absorbing layer 1443 may be the same or similar to that of the first light absorbing layer 1422 and the second light absorbing layer (ie, the light absorbing component 1441), and will not be repeated here.
  • the arrangement of the second light transmissive component 1442 and the third light absorbing layer 1443 helps to filter out more stray light or a large angle incident light beam of the first collimator 140B, thereby enhancing the recognition capability of the biometric identification device.
  • the refractive index of the second light transmissive component 1442 is greater than 1, and falls, for example, in the range of 1.3 to 1.7.
  • the ratio of the height WO2 of the aperture WO3 of each of the third openings O3 to the height of the second light-transmitting component 1442 falls within the range of 2 to 20.
  • the refractive index of the second light transmissive component 1442 and the height H2 of the third opening O3 and the height H2 of the second light transmissive component 1442 may be different according to different design requirements (eg, the pitch of the image capturing component 130 (pitch) )) changes, not limited to the above.
  • the first collimator 140C of FIG. 9 is similar to the first collimator 140 of FIG. 4, and the first collimator 140C has similar functions and advantages as the first collimator 140.
  • the top view of the first collimating component 142C of FIG. 9 can refer to FIG. 3 and the corresponding paragraphs of the specification, and will not be repeated here.
  • the difference between the first collimator 140C of FIG. 9 and the first collimator 140 of FIG. The difference is as follows. Compared with the first collimating component 142 of FIG. 4, the first light absorbing layer 1422 of the first collimating component 142C of FIG.
  • first light absorbing layer 1422 may not be disposed on the surface S1421B of the first light transmissive component 1421 and the sidewall surface S1421C.
  • the second collimating assembly 144C of FIG. 9 further includes a plurality of second light transmissive components 1442 as compared to the second collimating assembly 144 of FIG.
  • the second light transmissive component 1442 is disposed in the second opening O2.
  • the second light transmissive components 1442 are spaced apart and overlapped with the first opening O1.
  • the light absorbing component 1441 surrounds the second light transmissive component 1442 and covers the sidewall of the second light transmissive component 1442.
  • the second light transmissive component 1442 is, for example, in close contact with the light absorbing assembly 1441, and there is no air gap between the second light transmissive component 1442 and the light absorbing component 1441. That is, the width W1442 of the second light transmissive component 1442 is equal to the aperture WO2 of the second opening O2, respectively.
  • the second collimating assembly 144C can be secured to the first collimating assembly 142C by a coupling mechanism or an adhesive layer.
  • the refractive index of the light transmitting medium eg, air or optical glue
  • the second light transmitting component is incident
  • the beam B' of 1442 will enter the second light transmissive component 1442 via refraction at the upper surface S1442 of the second light transmissive component 1442.
  • the arrangement of the second light transmissive component 1442 helps to converge the angle of the beam B' into the second light transmissive component 1442, thereby allowing more of the beam B' to be transmitted to the image capture assembly 130.
  • the material of the second light transmissive component 1442 may be a silica gel or an acrylic light transmissive material.
  • Whether the light beam entering the second collimating component 144C is absorbed by the light absorbing component 1441 may depend on the aperture WO2 of the second opening O2, the height H2 of the second light transmitting component 1442, and the beam B' on the upper surface S1442 of the second light transmitting component 1442.
  • the angle of refraction (determined by the angle of incidence of beam B' and the index of refraction of second light transmissive component 1442).
  • the height H2 of the second light transmitting member 1442 is constant, the larger the aperture WO2 of the second opening O2, the larger the angular range of the light beam B' received by the image capturing assembly 130.
  • the larger the refraction angle of the beam B' ie, the larger the incident angle
  • the refractive indices of the second light transmissive components 1442 are respectively greater than 1, and fall, for example, in the range of 1.3 to 1.7, respectively, and the apertures WO2 of the second openings O2 and the height H2 of the second light transmissive components 1442 The ratio falls within the range of 2 to 20.
  • the refractive index of the second light transmissive component 1442 and the height H2 of the second opening O2 and the height H2 of the second light transmissive component 1442 may be different according to different design requirements (eg, the pitch of the image capturing component 130 (pitch) )) changes, not limited to the above.
  • the first light absorbing layer 1422 and the light absorbing component 1441 to absorb the large-angle light beam (for example, the light beam B1') that acts through the light-receiving object 10 and passes through the light guiding component 120, a light beam of only a certain angle (a small-angle incident light beam, for example, : Beam B2') is passed to image capture component 130.
  • a small-angle incident light beam for example, : Beam B2'
  • the light beam B' passing through the first collimator 140 can be incident on the image capturing assembly 130 at an angle of 0 degrees or nearly 0 degrees.
  • the first collimator 140 facilitates collimating the beam that is transmitted to the image capture assembly 130.
  • the biometric device 100 can have good recognition capabilities.
  • the biometric device of the embodiment of the present invention by modulating the apertures of the first opening and the second opening to absorb the large-angle beam that acts through the object to be recognized and passes through the light guiding component, The beam is collimated to the image capturing component to improve the image quality of the image capturing component. Therefore, the biometric device can have good recognition capabilities.

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  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Bioinformatics & Computational Biology (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Data Mining & Analysis (AREA)
  • Evolutionary Biology (AREA)
  • Evolutionary Computation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Artificial Intelligence (AREA)
  • Optics & Photonics (AREA)
  • Human Computer Interaction (AREA)
  • Multimedia (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Image Input (AREA)

Abstract

L'invention concerne un dispositif d'identification biométrique, comprenant des sources de lumière, un ensemble de guidage de lumière, un ensemble de capture d'image et un premier collimateur. Les sources de lumière sont appropriées pour produire des faisceaux lumineux. L'ensemble de guidage de lumière est situé sur des trajets de transmission des faisceaux lumineux. L'ensemble de capture d'image est situé au-dessous de l'ensemble de guidage de lumière, et est pourvu d'une pluralité de régions de pixel. Le premier collimateur est situé entre l'ensemble de guidage de lumière et l'ensemble de capture d'image, et comprend un premier ensemble de collimation et un second ensemble de collimation. Le premier ensemble de collimation comprend un premier ensemble de transmission de lumière, une première couche d'absorption de lumière et une pluralité d'ensembles de lentilles. La première couche d'absorption de lumière est disposée sur le premier ensemble de transmission de lumière, et est pourvue d'une pluralité de premières ouvertures qui se chevauchent avec les régions de pixel. Les ensembles lentilles sont disposés sur le premier ensemble transmettant la lumière, et sont situés à l'intérieur des premières ouvertures. Un ensemble d'absorption de lumière du second ensemble de collimation et des premières ouvertures sont respectivement situés sur des côtés opposés du premier ensemble de transmission de lumière, et l'ensemble d'absorption de lumière est pourvu d'une pluralité de secondes ouvertures qui se chevauchent avec les premières ouvertures. Le dispositif d'identification biométrique a une bonne capacité d'identification.
PCT/CN2017/078492 2016-12-23 2017-03-29 Dispositif d'identification biométrique WO2018113126A1 (fr)

Applications Claiming Priority (2)

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CN201611208441.6 2016-12-23
CN201611208441.6A CN108241834A (zh) 2016-12-23 2016-12-23 生物特征辨识装置

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CN108241834A (zh) 2018-07-03
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