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US20200042765A1 - Under-screen fingerprint identification device - Google Patents

Under-screen fingerprint identification device Download PDF

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Publication number
US20200042765A1
US20200042765A1 US16/454,088 US201916454088A US2020042765A1 US 20200042765 A1 US20200042765 A1 US 20200042765A1 US 201916454088 A US201916454088 A US 201916454088A US 2020042765 A1 US2020042765 A1 US 2020042765A1
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US
United States
Prior art keywords
sub
fingerprint identification
identification device
under
display element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US16/454,088
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English (en)
Inventor
Chun-Yu Lee
Hsu-Wen Fu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangzhou Tyrafos Semiconductor Technologies Co Ltd
Original Assignee
Guangzhou Tyrafos Semiconductor Technologies Co Ltd
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Application filed by Guangzhou Tyrafos Semiconductor Technologies Co Ltd filed Critical Guangzhou Tyrafos Semiconductor Technologies Co Ltd
Priority to US16/454,088 priority Critical patent/US20200042765A1/en
Assigned to TYRAFOS TECHNOLOGIES CO., LIMITED reassignment TYRAFOS TECHNOLOGIES CO., LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FU, HSU-WEN, LEE, CHUN-YU
Assigned to GUANGZHOU TYRAFOS SEMICONDUCTOR TECHNOLOGIES CO., LTD reassignment GUANGZHOU TYRAFOS SEMICONDUCTOR TECHNOLOGIES CO., LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: TYRAFOS TECHNOLOGIES CO., LIMITED
Publication of US20200042765A1 publication Critical patent/US20200042765A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06K9/0004—
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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 OR CALCULATING; 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
    • H01L27/14621—
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F39/00—Integrated devices, or assemblies of multiple devices, comprising at least one element covered by group H10F30/00, e.g. radiation detectors comprising photodiode arrays
    • H10F39/80—Constructional details of image sensors
    • H10F39/805—Coatings
    • H10F39/8053—Colour filters

Definitions

  • the disclosure relates to an under-screen fingerprint identification device.
  • biometric identification technology can be divided into fingerprint identification technology, iris recognition technology, DNA identification technology, and so forth.
  • fingerprint identification has gradually become the mainstream technology of biometric identification.
  • fingerprint on display has been actively developed by various manufacturers.
  • FOD fingerprint on display
  • physical buttons can be further removed, and a sensing element of the fingerprint identification is directly disposed below the display element, so as to achieve a higher screen-to-body ratio and comply with the requirements for the existing slim border display devices.
  • FOD allows the sensing beam to enter the sensing element through the display element and a plurality of optical film layers, and accordingly the intensity of the beam entering the sensing element becomes weak. Therefore, it is usually necessary to improve the imaging quality by means of signal amplification, so as to increase the success rate of fingerprint identification.
  • the region having larger intensity is overly saturated during the signal amplification process. As such, certain details of signals may be missing, which results in poor sensing quality.
  • the disclosure provides an under-screen fingerprint identification device with good fingerprint identification performance.
  • an under-screen fingerprint identification device includes an image sensing element, a display element, an optical lens, and a band pass filter element.
  • the image sensing element is disposed below the display element.
  • the optical lens is disposed between the image sensing element and the display element.
  • the band pass filter element is disposed between the image sensing element and the display element.
  • An object to be identified is disposed on the display element. An initial beam is incident to the object to be identified, the object to be identified reflects the initial beam to generate a sensing beam, and the sensing beam is transmitted to the image sensing element through the display element, the optical lens, and the band pass filter element.
  • the band pass filter element allows a beam with a specific wavelength range to pass. The specific wavelength range and a wavelength range of the initial beam are partially overlapped.
  • the wavelength range of the initial beam is within a range from ⁇ L1 to ⁇ L2
  • the sensing beam includes a first sub-beam
  • an incidence angle ⁇ 1 between the first sub-beam and a normal line of the band pass filter element is substantially 0°
  • the band pass filter element has a first filter frequency spectrum corresponding to the first sub-beam
  • a transmittance rate corresponding to the first filter frequency spectrum at a wavelength ⁇ F11 and a wavelength ⁇ F12 is 50%
  • the wavelength ⁇ F11 is shorter than the wavelength ⁇ F12
  • ⁇ L1 ⁇ F11 ⁇ L2 .
  • the band pass filter element is disposed between the image sensing element and the optical lens.
  • the band pass filter element is disposed between the display element and the optical lens.
  • the sensing beam further includes a second sub-beam, an incidence angle ⁇ 2 between the second sub-beam and the normal line of the band pass filter element is greater than the incidence angle ⁇ 1 between the first sub-beam and the normal line of the band pass filter element, the band pass filter element has a second filter frequency spectrum corresponding to the second sub-beam, a transmittance rate corresponding to the second filter frequency spectrum at a wavelength ⁇ F21 and a wavelength ⁇ F22 is 50%, the wavelength ⁇ F21 is shorter than the wavelength ⁇ F22 , and ⁇ F21 ⁇ F11 .
  • ⁇ L1 ⁇ F21 ⁇ F11 ⁇ L1 ⁇ F21 ⁇ F11 .
  • ⁇ F21 ⁇ L1 ⁇ F21 ⁇ L1 .
  • a full width at half maximum (FWHM) of the first filter frequency spectrum is greater than an FWHM of the initial beam.
  • the display element emits the initial beam.
  • an under-screen fingerprint identification device configured to identify an object to be identified and includes an image sensing element, a display element, and an optical lens.
  • the image sensing element is disposed below the display element.
  • the optical lens is disposed between the image sensing element and the display element, wherein an initial beam generates a light spot on the display element, the light spot includes a central portion and a peripheral portion outside the central portion, and a brightness of the peripheral portion is greater than a brightness of the central portion.
  • the initial beam includes a central sub-beam and a peripheral sub-beam
  • the central sub-beam defines the central portion of the light spot on the display element
  • the peripheral sub-beam defines the peripheral portion of the light spot on the display element
  • the central sub-beam passes through an optical axis region of the optical lens
  • the peripheral sub-beam passes through a peripheral region of the optical lens
  • the under-screen fingerprint identification device provided in one or more embodiments of the disclosure includes the band pass filter element.
  • the band pass filter element has different filter spectrums corresponding to different beams with different incidence angles, and thus the brightness at the edge of the image sensing element can be compensated, and the identification quality of the under-screen fingerprint identification device can be compensated.
  • the brightness distribution of the light spot generated by the initial beam is not uniform.
  • the light spot has a central portion with small brightness and a peripheral portion with large brightness
  • the initial beam includes a central sub-beam and a peripheral sub-beam
  • the central sub-beam defines the central portion of the light spot on the display element
  • the peripheral sub-beam defines the peripheral portion of the light spot on the display element
  • the central sub-beam passes through an optical axis region of the optical lens
  • the peripheral sub-beam passes through a peripheral region of the optical lens.
  • the intensity of the peripheral sub-beam is greater than the intensity of the central sub-beam, and therefore the peripheral sub-beam can compensate for lens shading, and the identification quality of the under-screen fingerprint identification device can be further improved.
  • FIG. 1 is a schematic cross-sectional view of an under-screen fingerprint identification device according to an embodiment of the disclosure.
  • FIG. 2 illustrates that a band pass filter element of an under-screen fingerprint identification device has a first filter frequency spectrum S F1 corresponding to a first sub-beam L 1 , a second filter frequency spectrum S F2 corresponding to a second sub-beam L 2 , a third filter frequency spectrum S F3 corresponding to a third sub-beam L 3 , a fourth filter frequency spectrum S F4 corresponding to a fourth sub-beam L 4 , and a light emitting frequency spectrum S L of an initial beam L according to an embodiment of the disclosure.
  • FIG. 3A is a schematic top view of an image sensing element according to an embodiment of the disclosure.
  • FIG. 3B illustrates a light distribution curve I on an image sensing element at the line segment A-A′ depicted in FIG. 3A and a light distribution curve Iref on an image sensing element of an under-screen fingerprint identification device according to a comparison example.
  • FIG. 4 is a schematic cross-sectional view of an under-screen fingerprint identification device according to another embodiment of the disclosure.
  • FIG. 5 is a schematic cross-sectional view of an under-screen fingerprint identification device according to still another embodiment of the disclosure.
  • FIG. 6A illustrates a light spot P on a display element 120 .
  • FIG. 6B is a schematic view illustrating a brightness distribution of a central portion and a peripheral portion of a light spot P corresponding to the line segment B-B′ depicted in FIG. 6A .
  • FIG. 7 illustrates a light distribution curve S 1 of the light spot P on the image capturing element 110 of the under-screen fingerprint identification device 100 C after the light spot P on the display element 120 of the under-screen fingerprint identification device 100 C depicted in FIG. 5 is reflected by an object 10 to be identified.
  • FIG. 8 illustrates a light spot P′ on a display element of an under-screen fingerprint identification device according to a comparison example.
  • FIG. 9 illustrates a light distribution curve S 1 ′ of the light spot P′ on an image capturing element of an under-screen fingerprint identification device after the light spot P′ on a display element of the under-screen fingerprint identification device in a comparison example is reflected by an object to be identified.
  • substantially means more than the minimum or ineffective amount, and “substantially” means more than the minimum or ineffectively.
  • the term “substantially different” it means that there is a sufficient degree of difference between two values, so that people skill in the art will consider the difference between the two values within the context of the characteristics measured by the equivalent value, which is statistically significant.
  • the difference between the two values that are substantially different from each other is typically greater than about 10%, and can be greater than about 20%, greater than about 30%, greater than about 40%, or greater than about 50%, which may vary together with a reference value or a function of a comparison value.
  • FIG. 1 is a schematic cross-sectional view of an under-screen fingerprint identification device according to an embodiment of the disclosure.
  • FIG. 2 illustrates that a band pass filter element of an under-screen fingerprint identification device has a first filter frequency spectrum S F1 corresponding to a first sub-beam L 1 , a second filter frequency spectrum S F2 corresponding to a second sub-beam L 2 , a third filter frequency spectrum S F3 corresponding to a third sub-beam L 3 , a fourth filter frequency spectrum S F4 corresponding to a fourth sub-beam L 4 , and a light emitting frequency spectrum S L of an initial beam L according to an embodiment of the disclosure.
  • the first sub-beam L 1 , the second sub-beam L 2 , the third sub-beam L 3 , and the fourth sub-beam L 4 are respectively incident to the band pass filter element 140 at an incidence angle ⁇ 1 , an incidence angle ⁇ 2 , an incidence angle ⁇ 3 , and an incidence angle ⁇ 4 .
  • the incidence angle ⁇ 1 , the incidence angle ⁇ 2 , the incidence angle ⁇ 3 , and the incidence angle ⁇ 4 may be but are not limited to 0°, 10°, 20°, and 30°, respectively.
  • an under-screen fingerprint identification device 100 A includes an image sensing element 110 , a display element 120 , an optical lens 130 , and a band pass filter element 140 .
  • the image sensing element 110 is disposed below the display element 120 .
  • the optical lens 130 is disposed between the image sensing element 110 and the display element 120 .
  • the band pass filter element 140 is disposed between the image sensing element 110 and the display element 120 .
  • the band pass filter element 140 can be optically disposed between the image sensing element 110 and the optical lens 130 , which should however not be construed as a limitation in the disclosure.
  • the image sensing element 110 can include a plurality of sensing regions (not shown) arranged on a plane in an X direction and a Y direction, and the image sensing element 110 , the display element 120 , the optical lens 130 , and the band pass filter element 140 can be arranged along a Z direction perpendicular to the X direction and the Y direction.
  • the image sensing element 110 can be a complementary metal oxide semiconductor image sensor (CMOS image sensor, CIS), a charge coupled device (CCD), or any other appropriate type of image sensing element.
  • CMOS image sensor complementary metal oxide semiconductor image sensor
  • CCD charge coupled device
  • the display element 120 can be a self-illuminating display element including but not limited to an organic light-emitting diode (OLED). This should however not be construed as a limitation in the disclosure; according to other embodiments, the display element 120 may also be a non-self-illuminating display element including but not limited to a liquid crystal display (LCD) element.
  • OLED organic light-emitting diode
  • the optical lens 130 can be a lens assembly having a plurality of lenses.
  • the lenses can be a bi-convex lens, a bi-concave lens, a plano-convex lens, a plano-concave lens, a convex-concave lens, any other lens, or a combination of at least two of the aforesaid lenses.
  • a sensing beam L′ reflected by an object 10 forms images onto the image sensing element 110 by the optical lens 130 .
  • the under-screen fingerprint identification device 100 A can further include a casing 150 configured to accommodate the optical lens 130 .
  • the casing 150 can optically accommodate the band pass filter element 140 and the image sensing element 110 , which should however not be construed as a limitation in the disclosure.
  • the under-screen fingerprint identification device 100 A can optically include a substrate 160 and a translucent cover 170 .
  • the substrate 160 can be configured to hold the image sensing element 110 .
  • the translucent cover 170 is disposed on the display element 120 to protect the display element 120 .
  • the translucent cover 170 has an upper surface 170 s where the object 10 to be identified is adapted to be disposed. That is, the upper surface 170 s of the translucent cover 170 may be a surface of the under-screen fingerprint identification device 100 A receiving a pressing action, which should however not be construed as a limitation in the disclosure.
  • the under-screen fingerprint identification device 100 A can further include an amplifier (not shown) electrically connected to the image sensing element 110 .
  • the image sensing element 110 is configured to receive a sensing beam L′ and convert the same to a corresponding electric signal, and the amplifier is configured to amplify the electric signal output by the image sensing element 110 .
  • the object 10 to be identified is disposed on the display element 120 , the initial beam L is incident to the object 10 to be identified, and the object 10 to be identified reflects the initial beam L to generate the sensing beam L′.
  • the sensing beam L′ is transmitted to the image sensing element 110 through the display element 120 , the optical lens 130 , and the band pass filter element 140 .
  • the display element 120 is, for instance, a self-illuminating display element, and the initial beam L can be emitted from the display element 120 .
  • the initial beam L may also be emitted from another light source.
  • the object 10 to be identified may be fingerprints, vein, or any other biological features, which should however not be construed as a limitation in the disclosure.
  • the sensing beam L′ having the information of the object 10 to be identified (e.g., ridges and valleys of fingerprints) is generated.
  • the sensing beam L′ can include a first sub-beam L 1 , a second sub-beam L 2 , a third sub-beam L 3 , and a fourth sub-beam L 4 , wherein incidence angles ⁇ 1 , ⁇ 2 , ⁇ 3 , and ⁇ 4 are respectively formed between the a normal line N of the band pass filter element 140 and the first sub-beam L 1 , the second sub-beam L 2 , the third sub-beam L 3 , and the fourth sub-beam L 4 , respectively.
  • the incidence angle ⁇ 1 is substantially 0°, and ⁇ 1 ⁇ 2 ⁇ 3 ⁇ 4 ⁇ 90°.
  • the sensing beam L′ may include more sub-beams, and different incidence angles can be formed between the normal line N of the band pass filter element 140 and the sub-beams.
  • the first sub-beam L 1 , the second sub-beam L 2 , the third sub-beam L 3 , and the fourth sub-beam L 4 are exemplary and does not indicate that the sensing beam L′ provided herein merely has four sub-beams.
  • a wavelength range of the light emitting frequency spectrum S L of the initial beam L is within a range from ⁇ L1 to ⁇ L2 , and the wavelength ⁇ L1 is shorter than the wavelength ⁇ L2
  • ⁇ L1 can be 400 nm
  • ⁇ L2 can be 700 nm
  • ⁇ L1 can be 380 nm
  • ⁇ L2 can be 630 nm. That is, the wavelength range of the light emitting frequency spectrum S L of the initial beam L is about the wavelength range of a green beam, which should however not be construed as a limitation in the disclosure.
  • the band pass filter element 140 has the first filter frequency spectrum S F1 , the second filter frequency spectrum S F2 , the third filter frequency spectrum S F3 , and the fourth filter frequency spectrum S F4 respectively corresponding to the first sub-beam L 1 , the second sub-beam L 2 , the third sub-beam L 3 , and the fourth sub-beam L 4 .
  • a transmittance rate corresponding to the first filter frequency spectrum S F1 at a wavelength ⁇ F11 and a wavelength ⁇ F12 is 50%, the wavelength ⁇ F21 is shorter than the wavelength ⁇ F22 , and ⁇ L1 ⁇ F11 ⁇ L2 .
  • a transmittance rate corresponding to the second filter frequency spectrum S F2 at a wavelength ⁇ F21 and a wavelength ⁇ F22 is 50%, the wavelength ⁇ F21 is shorter than the wavelength ⁇ F22 , and ⁇ F21 ⁇ F11 ; preferably, ⁇ L1 ⁇ F21 ⁇ F11 .
  • a transmittance rate corresponding to the third filter frequency spectrum S F3 at a wavelength ⁇ F31 and a wavelength ⁇ F32 is 50%, the wavelength ⁇ F31 is shorter than the wavelength ⁇ F32 , and ⁇ F31 ⁇ F21 ; preferably, ⁇ L1 ⁇ F31 ⁇ F21 .
  • a transmittance rate corresponding to the fourth filter frequency spectrum S F4 at a wavelength ⁇ F41 and a wavelength ⁇ F42 is 50%, the wavelength ⁇ F41 is shorter than the wavelength ⁇ F42 , and ⁇ F41 ⁇ F31 ; preferably, ⁇ L1 ⁇ F41 ⁇ F31 .
  • a full width at half maximum (FWHM) W F1 of the first filter frequency spectrum S F1 corresponding to the first sub-beam L 1 is greater than the FWHM W L of the light emitting frequency spectrum S L of the initial beam L
  • a FWHM W F2 of the second filter frequency spectrum S F2 corresponding to the second sub-beam L 2 may be greater than the FWHM W L of the light emitting frequency spectrum S L of the initial beam L
  • a FWHM W F3 of the filter frequency spectrum S F3 corresponding to the third sub-beam L 3 may be greater than the FWHM W L of the light emitting frequency spectrum S L of the initial beam L
  • a FWHM W F4 of the fourth filter frequency spectrum S F4 corresponding to the fourth sub-beam L 4 may be greater than the FWHM W L of the light emitting frequency spectrum S L of the initial beam L.
  • the FWHM refers to the difference between two wavelengths whose spectrum corresponds to the transmittance rate as 50%.
  • the FWHM W F1 of the first filter frequency spectrum S F1 is ⁇ F12 ⁇ F11
  • the FWHM W F2 of the second filter frequency spectrum S F2 is ⁇ F22 ⁇ F21
  • the FWHM W F3 of the third filter frequency spectrum S F3 is ⁇ F32 ⁇ F31
  • the FWHM W F4 of the fourth filter frequency spectrum S F4 is ⁇ F42 ⁇ F41
  • the FWHM W L of the light emitting frequency spectrum S L of the initial beam L is ⁇ L4 ⁇ L3 .
  • FIG. 3A is a schematic top view of an image sensing element according to an embodiment of the disclosure.
  • FIG. 3B illustrates a light distribution (represented by a curve I) on an image sensing element at the line segment A-A′ depicted in FIG. 3A .
  • FIG. 3B also illustrates a light distribution (represented by a curve Iref) on an image sensing element of an under-screen fingerprint identification device according to a comparison example.
  • the difference between the under-screen fingerprint identification device in the comparison example and the under-screen fingerprint identification device 100 A depicted in FIG. 1 lies in that the under-screen fingerprint identification device provided in the comparison example is not equipped with the band pass filter element 140 .
  • the x axis shown in FIG. 3B represents a distance to a center 110 c of the image sensing element 110
  • the y axis shown in FIG. 3B represents a normalized brightness.
  • the sensing beam L′ is transmitted to the image sensing element 110 through the band pass filter element 140 , thus resulting in corresponding brightness distribution in different regions on the image sensing element 110 .
  • the first sub-beam L 1 , the second sub-beam L 2 , the third sub-beam L 3 , and the fourth sub-beam L 4 of the sensing beam L′ are transmitted to the image sensing element 110
  • the first sub-beam L 1 is transmitted to be close to the center 110 c of the image sensing element 110
  • the second sub-beam L 2 , the third sub-beam L 3 , and the fourth sub-beam L 4 are sequentially away from the center 110 c of the image sensing element 110 .
  • the filter frequency spectrum of the band pass filter element 140 tends to be changed together with the incidence angle of the incident beam. Particularly, if the incidence angle increases from 0, the filter frequency spectrum of the band pass filter element 140 moves toward a short wave direction.
  • the second filter frequency spectrum S F2 corresponding to the second sub-beam L 2 is, in comparison with the first filter frequency spectrum S F1 corresponding to the first sub-beam L 1 , closer to the short wave direction
  • the third filter frequency spectrum S F3 corresponding to the third sub-beam L 3 is, in comparison with the second filter frequency spectrum S F2 corresponding to the second sub-beam L 2 , closer to the short wave direction
  • the fourth filter frequency spectrum S F4 corresponding to the fourth sub-beam L 4 is, in comparison with the third filter frequency spectrum S F3 corresponding to the third sub-beam L 3 , closer to the short wave direction.
  • the sub-beam with larger incidence angle is more likely to arrive at the image capturing element 110 through the band pass filter element 140 (i.e., when an incidence angle between the sub-beam and a normal line of the band pass filter element 140 is larger, the ratio of the amount of the sub-beam passing the band pass filter element 140 to the amount of the sub-beam not yet entering the band pass filter element 140 is higher).
  • the possibility of the fourth sub-beam L 4 arriving at the image capturing element 110 through the band pass filter element 140 is greater than the possibility of the third sub-beam L 3 arriving at the image capturing element 110 through the band pass filter element 140
  • the possibility of the third sub-beam L 3 arriving at the image capturing element 110 through the band pass filter element 140 is greater than the possibility of the second sub-beam L 2 arriving at the image capturing element 110 through the band pass filter element 140
  • the possibility of the second sub-beam L 2 arriving at the image capturing element 110 through the band pass filter element 140 is greater than the possibility of the first sub-beam L 1 arriving at the image capturing element 110 through the band pass filter element 140 .
  • the light distribution curve I on the image capturing element 110 of the under-screen fingerprint identification device 100 A provided in the present embodiment is smoother than the light distribution curve Iref on the image capturing element of the under-screen fingerprint identification device provided in the comparison example, and the electric signal corresponding to the light distribution curve I is more suitable for being amplified by the amplifier, so as to better prevent the issue of over-saturation and the resultant loss of image details, which is conducive to the improvement of the identification quality of the under-screen fingerprint identification device 100 A.
  • FIG. 4 is a schematic cross-sectional view of an under-screen fingerprint identification device according to another embodiment of the disclosure.
  • the under-screen fingerprint identification device 100 B depicted in FIG. 4 is similar to the under-screen fingerprint identification device 100 A depicted in FIG. 1 , while the difference therebetween lies in that the band pass filter element 140 is disposed between the display element 120 and the optical lens 130 according to the present embodiment.
  • the other elements therein are arranged in a similar manner as the arrangement of the elements in the under-screen fingerprint identification device 100 A depicted in FIG. 1 , and the technical effects achieved by these elements are similar as well; hence, no further explanation will be provided hereinafter.
  • FIG. 5 is a schematic cross-sectional view of an under-screen fingerprint identification device according to still another embodiment of the disclosure.
  • FIG. 6A illustrates a light spot P on a display element 120 .
  • FIG. 6B is a schematic view illustrating a brightness distribution of a central portion and a peripheral portion of a light spot P corresponding to the line segment B-B′ depicted in FIG. 6A .
  • FIG. 7 illustrates a light distribution curve S 1 of the light spot P on the image capturing element 110 of the under-screen fingerprint identification device 100 C after the light spot P on the display element 120 of the under-screen fingerprint identification device 100 C depicted in FIG. 5 is reflected by an object 10 to be identified.
  • the under-screen fingerprint identification device 100 C provided in the present embodiment is similar to the under-screen fingerprint identification device 100 A depicted in FIG. 1 , while the difference therebetween lies in that the under-screen fingerprint identification device 100 C is not equipped with the band pass filter element, while the other optical elements therein are arranged in a similar manner as the arrangement of the optical elements in the under-screen fingerprint identification device 100 A depicted in FIG. 1 and thus will not be further explained.
  • the difference is addressed.
  • the under-screen fingerprint identification device 100 C is configured to identify the object 10 to be identified and includes the image sensing element 110 , the display element 120 , and the optical lens 130 .
  • the display element 120 is disposed on the image sensing element 110 .
  • the optical lens 130 is disposed between the image sensing element 110 and the display element 120 .
  • the initial beam L generates a light spot P on the display element 120 , the light spot P includes a central portion Pc and a peripheral portion Pe outside the central portion Pc, and a brightness of the peripheral portion Pe is greater than a brightness of the central portion Pc.
  • the initial beam L includes a central sub-beam Lc and a peripheral sub-beam Le
  • the central sub-beam Lc defines the central portion Pc of the light spot P on the display element 120
  • the peripheral sub-beam Le defines the peripheral portion Pe of the light spot P on the display element 120
  • the central sub-beam Lc passes through an optical axis region 130 c of the optical lens 130
  • the peripheral sub-beam Le passes through a peripheral region 130 e of the optical lens 130 .
  • a brightness of the central portion Pc of the light spot P is Bc
  • a brightness of the peripheral portion Pe of the light spot P is Be
  • the light spot P has two brightnesses, i.e., the brightness Bc and the brightness Be.
  • a brightness at an intersection between the central portion Pc and the peripheral portion Pe can be gradually increased in a direction from the central portion Pc to the peripheral portion Pe.
  • FIG. 8 illustrates a light spot P′ on a display element of an under-screen fingerprint identification device according to a comparison example.
  • FIG. 9 illustrates a light distribution curve S 1 ′ of the light spot P′ on an image capturing element of an under-screen fingerprint identification device after the light spot P′ on a display element of the under-screen fingerprint identification device in a comparison example is reflected by an object to be identified.
  • the difference between the under-screen fingerprint identification device provided in the comparison example and the under-screen fingerprint identification device 100 C provided in the present embodiment lies in that the light intensity distribution of the light spot P′ on the display element of the under-screen fingerprint identification device in the comparison example is uniform.
  • the light intensity distribution of the light spot P on the display element 120 of the under-screen fingerprint identification device 100 C provided in the present embodiment is not uniform, and the light spot P′ with the non-uniform light intensity distribution and the lens shading effect of the optical lens 130 can compensate for each other, so as to reduce the height difference ⁇ S 1 of the resultant light distribution curve S 1 on the image capturing element 110 .
  • the electric signal corresponding to the light distribution curve S 1 is more suitable for being amplified by the amplifier, so as to better prevent the issue of over-saturation and the resultant loss of image details, which is conducive to the improvement of the identification quality of the under-screen fingerprint identification device 100 C.

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