CN112699761A - Fingerprint identification panel and fingerprint identification display module - Google Patents

Fingerprint identification panel and fingerprint identification display module Download PDF

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Publication number
CN112699761A
CN112699761A CN202011552675.9A CN202011552675A CN112699761A CN 112699761 A CN112699761 A CN 112699761A CN 202011552675 A CN202011552675 A CN 202011552675A CN 112699761 A CN112699761 A CN 112699761A
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fingerprint identification
layer
panel
light
equal
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周文泣
杨雁
周婷
李俊谊
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Xiamen Tianma Microelectronics Co Ltd
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Xiamen Tianma Microelectronics Co Ltd
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12Fingerprints or palmprints
    • G06V40/13Sensors therefor
    • G06V40/1324Sensors therefor by using geometrical optics, e.g. using prisms
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12Fingerprints or palmprints
    • G06V40/13Sensors therefor
    • G06V40/1318Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Image Input (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)

Abstract

The embodiment of the invention discloses a fingerprint identification panel and a fingerprint identification display module. This fingerprint identification panel is including the substrate, circuit layer, the collimation structural layer, microlens layer and the euphotic layer that stack gradually the setting: the circuit layer comprises a plurality of fingerprint identification units, and each fingerprint identification unit comprises at least one photosensitive element; the alignment structure layer comprises at least one light shielding layer, and the light shielding layer comprises a plurality of alignment holes; the microlens layer includes a plurality of microlenses; in the direction perpendicular to the plane of the substrate, the micro lenses and the collimating holes are in one-to-one correspondence, orthographic projections of the corresponding micro lenses and the collimating holes are at least partially overlapped, and an overlapped area is at least partially overlapped with the orthographic projection of the photosensitive element; the refractive index of the light-transmitting layer is smaller than that of the micro lens. The embodiment of the invention can effectively increase the luminous flux incident to the photosensitive element, improve the intensity of the fingerprint signal and ensure the effective identification of the fingerprint signal.

Description

Fingerprint identification panel and fingerprint identification display module
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a fingerprint identification panel and a fingerprint identification display module.
Background
At present, the technology of fingerprint under a screen mainly comprises an optical type and an ultrasonic type, wherein the optical fingerprint is formed by irradiating light emitted by an OLED (organic light emitting diode) onto a fingerprint and reflecting the light into a CMOS (complementary metal oxide semiconductor) sensor below the screen to realize fingerprint identification; the ultrasonic fingerprint is that an ultrasonic emitter is arranged below a screen, and emitted ultrasonic waves enter a sensor below the screen after being reflected by the fingerprint.
However, the existing ultrasonic fingerprint technology needs additional arrangement of an ultrasonic signal emission source, has a complex structure, and can only perform local fingerprint identification. Similarly, the fingerprint identification area of the optical fingerprint identification technology is small, a large-area sensor needs to be prepared for realizing full-screen fingerprint identification, the cost is high, and the utilization rate is low. In addition, the existing optical fingerprint identification external sensor and collimation film structure can cause the film layer to be thick, occupy too large space, lead the path of the light reflected by the fingerprint to be long and lead the sensitivity of fingerprint identification to be poor.
Disclosure of Invention
The invention provides a fingerprint identification panel and a fingerprint identification display module, which are used for improving the structure of optical fingerprint identification, improving the sensitivity and enabling the fingerprint identification panel to be suitable for large-area fingerprint identification.
In a first aspect, an embodiment of the present invention provides a fingerprint identification panel, including a substrate, a circuit layer, a collimating structure layer, a microlens layer, and a light-transmitting layer, which are sequentially stacked;
the circuit layer comprises a plurality of fingerprint identification units, and each fingerprint identification unit comprises at least one photosensitive element;
the alignment structure layer comprises at least one light shielding layer, and the light shielding layer comprises a plurality of alignment holes;
the microlens layer includes a plurality of microlenses; in the direction perpendicular to the plane of the substrate, the micro lenses and the collimating holes are in one-to-one correspondence, orthographic projections of the corresponding micro lenses and the collimating holes are at least partially overlapped, and an overlapped area is at least partially overlapped with the orthographic projection of the photosensitive element;
the refractive index of the light-transmitting layer is smaller than that of the micro lens.
In a second aspect, an embodiment of the present invention further provides a fingerprint identification display module, including the fingerprint identification panel according to any one of the first aspects, and further including a display panel, where the fingerprint identification panel is located on a side of the display panel away from the light exit side.
In the embodiment of the invention, the collimating structure comprises a substrate, a circuit layer, a collimating structure layer, a lens layer and a euphotic layer which are sequentially stacked; the circuit layer comprises a plurality of fingerprint identification units, and each fingerprint identification unit comprises at least one photosensitive element; the alignment structure layer comprises at least one light shielding layer, and the light shielding layer comprises a plurality of alignment holes; the micro-lens layer comprises a plurality of micro-lenses, the micro-lenses and the collimating holes are in one-to-one correspondence in the direction vertical to the plane of the substrate, orthographic projections of the corresponding micro-lenses and the collimating holes are at least partially overlapped, and the overlapped area is at least partially overlapped with the orthographic projection of the photosensitive element; the refractive index of euphotic layer is less than the refractive index of microlens, can guarantee that microlens possesses certain light convergence ability to collect the fingerprint reflection light of photosensitive element corresponding position, make fingerprint signal pass through the refraction of this microlens and assemble as much as possible, incident to photosensitive element through collimation structure again, effectively increase the luminous flux of inciding photosensitive element, improve fingerprint signal's intensity, guarantee fingerprint signal's effective discernment.
Drawings
Fig. 1 is a schematic structural diagram of a fingerprint identification panel according to an embodiment of the present invention;
FIG. 2 is a partial top view of the fingerprint identification panel of FIG. 1;
FIG. 3 is a schematic diagram of another fingerprint identification panel according to an embodiment of the present invention;
FIG. 4 is a partial top view of the fingerprint identification panel of FIG. 3;
FIG. 5 is a schematic top view of a fingerprint identification panel according to an embodiment of the present invention;
FIG. 6 is an enlarged partial view of another fingerprint identification panel provided by an embodiment of the present invention;
FIG. 7 is a light schematic diagram of a fingerprint identification panel provided by an embodiment of the present invention;
FIG. 8 is a graph of the signal-to-noise ratio of the photosensitive element and the position of the light shielding layer according to an embodiment of the present invention;
FIGS. 9 and 10 are enlarged partial views of two further types of fingerprint identification panels provided by embodiments of the present invention;
fig. 11 is a schematic structural diagram of a fingerprint identification display module according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of another fingerprint identification display module according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of another fingerprint identification display module according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a fingerprint identification panel according to an embodiment of the present invention, and referring to fig. 1, the fingerprint identification panel includes a substrate 10, a circuit layer 20, a collimating structure layer 30, a microlens layer 40, and a light-transmissive layer 50, which are sequentially stacked: the circuit layer 20 includes a plurality of fingerprint recognition units 21, the fingerprint recognition units 21 including at least one photosensitive element 210; the alignment structure layer 30 includes at least one light-shielding layer 31, and the light-shielding layer 31 includes a plurality of alignment holes 310;
the microlens layer 40 includes a plurality of microlenses 41; in the direction perpendicular to the plane of the substrate 10, the microlenses 41 and the collimating holes 310 correspond one to one, the orthographic projections of the corresponding microlenses 41 and the collimating holes 310 at least partially overlap, and the overlapping area at least partially overlaps the orthographic projection of the photosensitive element 210; the refractive index of the light-transmitting layer 50 is smaller than that of the microlens 41.
First, this fingerprint identification panel need the cooperation attached on display panel, utilizes the fingerprint identification light source that provides on the display panel, forms reflection light through the fingerprint to carry out fingerprint identification. The substrate 10 may be a rigid substrate or a flexible substrate. Taking a rigid substrate as an example, it may be a glass substrate, a metal substrate, or the like; the flexible substrate may be an organic film such as Polyimide (PI) or Polyethylene terephthalate (PET). The circuit layer 20 is a fingerprint identification circuit formed by electronic devices formed on the substrate 10 and a trace, and includes a plurality of fingerprint identification units 21 for detecting reflected light of a fingerprint, and converts an optical signal into an electrical signal according to a photoelectric conversion principle, so as to detect the intensity of reflected light at a position, i.e., identify fingerprint information of a fingerprint valley or a fingerprint ridge in the fingerprint. The photosensitive element 210 in the fingerprint identification unit 21 is a main photoelectric conversion element, and can form photo-generated current for fingerprint identification according to photoelectric effect. The photosensitive element 210 is a Thin Film Transistor (TFT) fingerprint sensor, and an active layer of the TFT fingerprint sensor may be formed by using P-silicon or a-silicon. It can be understood that, in addition to the photosensitive elements 210, signal driving and processing circuits are required to be disposed in the fingerprint identification unit 21 in the circuit layer 20, each photosensitive element 210 is driven to perform photosensitive identification through scanning, and the accuracy of fingerprint identification signals is ensured through amplification, filtering and the like. Specifically, for each fingerprint identification unit 21, a scanning line and a signal line are provided to be connected thereto. The scanning lines are used for providing driving signals to the fingerprint identification unit 21 to start the corresponding photosensitive elements 210 for photosensitive identification, and the signal lines are responsible for outputting the photoelectric converted fingerprint identification electric signals to the fingerprint identification chip, and determining corresponding fingerprint information through processing and analyzing the electric signals.
In addition, the orthographic projection of the corresponding microlens 41 and the collimating hole 310 is arranged to at least partially overlap, and the overlapping area at least partially overlaps the orthographic projection of the photosensitive element 210, which is essential to ensure that the light reflected by the fingerprint through the microlens 41 can continue to be incident on the photosensitive element 210 through the collimating hole 310, so that the photosensitive element 210 can perform fingerprint identification to determine fingerprint information. In the embodiment, corresponding to each photosensitive element 210, a collimating structure layer 30 is disposed on the path of the fingerprint reflected light, and at least one collimating hole 310 in the light shielding layer 31 forms a specific collimating structure. The collimation structure has the function of isolating stray light incident from other directions and avoiding the influence of other stray light on the fingerprint reflection signal with weaker strength, thereby improving the signal-to-noise ratio of the fingerprint signal. The micro lens 41 is arranged on the collimating structure, the refractive index of the micro lens 41 is greater than that of the light transmitting layer 50 on the micro lens 41, so that the micro lens 41 can be ensured to have light convergence capacity, the fingerprint reflected light rays at the corresponding position of the photosensitive element 210 are collected, the reflected light rays are reflected and focused by the micro lens 41 as much as possible and then are incident on the photosensitive element 210 through the collimating structure, the luminous flux incident on the photosensitive element 210 is effectively increased, the intensity of a fingerprint signal is improved, and the effective identification of the fingerprint signal is ensured.
FIG. 2 is a partial top view of the fingerprint identification panel of FIG. 1. referring to FIGS. 1 and 2, the alternative fingerprint identification unit 21 includes a light sensing element 210; in a direction perpendicular to the plane of the substrate 10, the orthographic projection overlapping area of the plurality of microlenses 41 and the corresponding collimating holes 310 at least partially overlaps the orthographic projection of the photosensitive element 210. In other words, in this embodiment, one photosensitive element 210 is provided in each fingerprint identification unit 21, and the one fingerprint identification unit 21 is provided with the plurality of microlenses 41 and the collimating structure, respectively. When fingerprint identification is performed, a plurality of microlenses 41 can transmit light signals reflected by a fingerprint among a plurality of microlenses 41 corresponding to the same fingerprint identification unit 21, and the fingerprint identification unit 21 can determine fingerprint information according to fingerprint reflection signals provided by the plurality of microlenses 41. Alternatively, the fingerprint recognition unit 21 may recognize and determine fingerprint information while at least one microlens 41 transmits an optical signal reflected by a fingerprint.
Fig. 3 is a schematic structural diagram of another fingerprint identification panel according to an embodiment of the present invention, fig. 4 is a partial top view of the fingerprint identification panel shown in fig. 3, and referring to fig. 3 and 4, in another embodiment of the present invention, an optional fingerprint identification unit 21 includes a plurality of photosensitive elements 210; in the direction perpendicular to the plane of the substrate 10, the microlenses 41 and the photosensitive elements 210 are in one-to-one correspondence, and there is a common overlapping region in the orthographic projections of the corresponding microlenses 41, the collimating holes 310 and the photosensitive elements 210.
In this embodiment, each fingerprint identification unit 21 is substantially provided with a plurality of light-sensitive elements 210, and each light-sensitive element 210 corresponds to one microlens 41 and one collimating structure and constitutes a fingerprint identification subunit. In the area corresponding to the fingerprint identification unit 21, as long as one fingerprint identification subunit can acquire the reflection signal of the fingerprint, the fingerprint information corresponding to the area can be determined. It can be understood that, by providing a plurality of fingerprint recognition sub-units in the fingerprint recognition unit 21, more fingerprint reflection signals can be collected by using a plurality of photosensitive elements 210, thereby improving the fingerprint signal strength of the whole fingerprint recognition unit 21.
It should be noted that the difference between the fingerprint recognition panel shown in fig. 1 and 2 and the fingerprint recognition panel shown in fig. 3 and 4 is that the number of photosensitive elements 210 in the fingerprint recognition unit 21 is different, in other words, the size of the photosensitive elements 210 is different. In the fingerprint identification unit 21 shown in fig. 1 and 2, the size of the photosensitive element 210 is larger, while in the fingerprint identification unit 21 shown in fig. 3 and 4, the photosensitive element 210 is smaller, and the design is not limited by the embodiment of the present invention, and those skilled in the art can consider and select the design according to the actual manufacturing process and cost. In addition, it should be noted that, as shown in fig. 3 and 4, the multiple photosensitive elements 210 in the fingerprint identification unit 21 may be connected in series or in parallel, so as to collect the acquired fingerprint signals, thereby performing identification of fingerprint information; alternatively, a plurality of photosensitive elements 210 may be provided independently, and the fingerprint information of the fingerprint recognition unit 21 may be formed by collecting and recognizing the fingerprint information for each photosensitive element 210.
The arrangement of the micro-lenses in each fingerprint identification unit is only an example, and besides the array arrangement of multiple rows and multiple columns, the arrangement of the micro-lenses in each fingerprint identification unit can also be designed to be a multi-row and up-down staggered arrangement. Of course, on the premise of ensuring that the fingerprint identification unit has higher arrangement density and improving the fingerprint identification precision, other arbitrary arrangement modes can be adopted, and redundant description is not repeated here.
As can be seen from the above, the setting density of the fingerprint identification unit directly determines the accuracy of fingerprint identification, wherein the specific structures such as the arrangement period, the shape and the size of the fingerprint identification unit are involved. In the embodiment of the invention, the fingerprint identification unit can be arranged in a polygonal, circular or elliptical structure, and the arrangement period of the fingerprint identification unit needs to meet the precision requirement of fingerprint identification. Fig. 5 is a schematic top view of a fingerprint identification panel according to an embodiment of the present invention, and referring to fig. 5, a ratio of an area of the fingerprint identification unit 21 to an area of the fingerprint identification panel is X, in an embodiment of the present invention, the area ratio X may be set to satisfy: x is more than or equal to 0.5 percent and less than or equal to 100 percent. In other words, the fingerprint identification area in the embodiment of the invention can be arranged to occupy the whole fingerprint identification panel, so that full-screen fingerprint identification is realized, and users can unlock or identify personal information through fingerprints greatly conveniently. Of course, the fingerprint identification area can be arranged to have a smaller area according to the structure of the fingerprint identification panel, but the fingerprint identification area can be arranged at any position of the panel, so that the fingerprint identification panel is more suitable for fingerprint identification of a single finger.
In addition, with continued reference to FIG. 5, the period C of the optional fingerprinting unit 21 satisfies: c is more than or equal to 0.03mm and less than or equal to 0.15mm, and the size L of the fingerprint identification unit 21 satisfies the following conditions: l is more than or equal to 0.001mm and less than or equal to 0.145 mm. The period C of the fingerprint identification unit 21 is less than 0.03mm, or the size L of the fingerprint identification unit 21 is less than 0.001mm, so that the fingerprint identification accuracy can be theoretically improved, but the spaces of the photosensitive element 210 and the driving circuit in the fingerprint identification unit 21 can be greatly limited, the difficulty in arrangement and design of the circuit and the wiring is greatly improved, and the actual preparation process is difficult to realize or has high cost. And when the period C of setting the fingerprint identification unit 21 is greater than 0.15mm, or the size L of setting the fingerprint identification unit 21 is greater than 0.145mm, the accuracy of fingerprint identification may exceed the requirement of fingerprint identification, and accurate fingerprint information may not be effectively provided, which may reduce the accuracy of fingerprint identification.
On the basis of the above embodiments, the present invention has also been studied and designed with respect to the light converging effect of the microlens. Fig. 6 is a partially enlarged schematic view of a fingerprint identification panel provided by an embodiment of the present invention, and referring to fig. 6, the fingerprint identification panel has a refractive index difference Δ n between an optional microlens 41 and a transparent layer 50 that satisfies: delta n is more than or equal to 0.3. In this case, the difference in refractive index between the microlens 41 and the light-transmitting layer 50 is determinedThe microlens 41 has a refraction effect on the light incident from the light-transmitting layer 50. It can be understood that when the fingerprint reflection light penetrates through the light transmission layer 50, the micro lens 41 is provided with a higher refractive index, that is, the difference between the refractive indexes of the two sides of the interface between the light transmission layer 50 and the micro lens 41 is increased, and the refraction angle is larger than the incident angle when the light is dispersed to the light density according to the refraction principle, so that the micro lens 41 can converge the fingerprint reflection light with a larger incident angle onto the photosensitive element 210, thereby increasing the amount of fingerprint signals received by the photosensitive element 210 and improving the sensitivity of fingerprint identification. Alternatively, according to the materials of the light-transmitting layer and the microlens, which are currently suitable, the refractive index n of the light-transmitting layer may be specifically set in the embodiment of the present invention1Satisfies the following conditions: n is more than or equal to 11Less than or equal to 1.5; refractive index n of microlens2Satisfies the following conditions: n is more than or equal to 1.52≤2.5。
Further, considering that the light sensing element 210 needs to be disposed near the focal plane of the microlens 41 to realize that the light sensing element 210 of a small area can capture as much of the fingerprint reflected light as possible, the focal length of the microlens 41 determines the thickness between the light sensing element 210 and the microlens 41. According to focal length formula of microlens
Figure BDA0002858438920000081
(wherein R is a curvature radius of the microlens, n1Is the refractive index of the light-transmitting layer, n2Is the refractive index of the microlens, n3Refractive index of the collimating structure layer), it can be seen that, in this embodiment, by limiting the refractive index difference between the microlens 41 and the light-transmitting layer 50, not only the refractive index of the microlens can meet the requirement, the light converging effect of the microlens can be improved, but also the focal length of the microlens can be limited not to be too large. The inventor researches and discovers that when the thickness between the micro lens and the photosensitive element is not more than 30 mu m, the film layer between the micro lens and the photosensitive element is relatively thin, and the problem of four-corner or edge warping of the whole fingerprint identification panel caused by the fact that the film layer is thick can be effectively avoided. Based on this, it is found through research that the difference between the refractive indexes of the microlens 41 and the light-transmitting layer 50 is greater than or equal to 0.3 in the present embodiment, the thickness between the microlens and the photosensitive element can be ensured to be less than or equal to 30 μm, so that the thickness problem of the fingerprint identification panel can be effectively improved,avoiding the warping of the four corners or edges.
Considering the problem of difficulty in the manufacturing process of the microlens, the focal length of the microlens can be set to be 5 μm ≦ F ≦ 30 μm. It can be understood that when the focal length of the microlens is set to be small, the microlens needs to be set to have a small thickness-to-width ratio, that is, the microlens needs to be as thin as possible based on the diameter of the microlens. However, the inventor researches and discovers that in an actual manufacturing process, the thickness of the micro lens has a lower limit due to the limitation of process precision, otherwise, the micro lens is difficult to form, and the focal length of the corresponding micro lens is 5 μm at the minimum.
On the basis, the ratio of the thickness H of the micro lens to the caliber CD can be set to be 1/20-H/CD-1/2. In this case, the microlens may have a large thickness and aperture ratio, so that it may not be molded during the production. Meanwhile, the micro-lens is essentially a segment of a sphere, and the vertical section of the micro-lens is arched. In this embodiment, the ratio of the thickness H to the aperture CD of the microlens is set to be not more than 1/2, which actually defines the vertical cross section of the microlens as a poor segment and a maximum semicircular shape, so that the microlens is relatively easier to manufacture, and a larger aperture for light transmission can be ensured compared with a microlens having a good segment in vertical cross section.
Further, it is found through research that the factors affecting the light sensing element to obtain the fingerprint reflected light in the fingerprint identification panel of this embodiment include the position and the caliber size of the collimating hole in the collimating structure layer, in addition to the light condensing capability of the microlens. First, in order to ensure that the light refracted by the microlens can be incident on the photosensitive element through the collimating structure to the maximum extent, in the embodiment of the invention, the distance d between the shading layer closest to the photosensitive element in the collimating structure layer and the microlens can be selected0Satisfies the following conditions: d is not more than 0.2 x (F-H)0Less than or equal to 0.2 (F-H); wherein F is the focal length of the microlens, and H is the thickness of the microlens. FIG. 7 is a light ray diagram of a fingerprint identification panel according to an embodiment of the present invention, FIG. 8 is a graph of the relationship between the signal-to-noise ratio of the photosensitive element and the position of the light shielding layer according to an embodiment of the present invention, and referring to FIG. 6 and FIG. 7 first, it can be understood that the distance between the light shielding layer 31 closest to the photosensitive element 210 and the microlens 41 is determinedThe distance is set to F-H, that is, the light shielding layer 31 is located on the focal plane of the microlens 41, and the light at this time is converged to a point and is incident on the photosensitive element 210 through the collimating hole 310 on the light shielding layer 31. In consideration of the actual tolerance, the distance between the light-shielding layer 31 closest to the photosensitive element 210 and the microlens 41 is defined to satisfy: d is not more than 0.2 x (F-H)0Less than or equal to 0.2 x (F-H), the collimating holes 310 on the light shielding layer 31 can effectively isolate external stray light, and the limitation on the fingerprint reflected light is reduced. Referring to fig. 8, the distance between the light shielding layer 31 closest to the photosensitive element 210 and the microlens 41 is limited to [ -0.2 x (F-H), 0.2 x (F-H)]Within the range of the interval, the signal-to-noise ratio of the photosensitive element 210 can be ensured to be more than 80%, so that the accurate identification of the photosensitive element on the fingerprint signal can be ensured, and the error is reduced.
For other light shielding layers in the collimating structure layer 30, based on the same light collimating principle, the distance d between the light shielding layer 31 in the collimating structure layer 30 and the microlens 41 may be set in the embodiment of the invention1Satisfies the following conditions: -0.2 (F-H) (1-phi/CD) is less than or equal to d1Less than or equal to 0.2 (F-H) (1-phi/CD); where F is the focal length of the microlens 41, H is the thickness of the microlens 41, Φ is the aperture of the collimating hole 310 in the light-shielding layer 31, and CD is the aperture of the microlens 41 corresponding to the collimating hole 310.
With continued reference to fig. 7, in order to ensure that each collimating aperture can reflect light through the fingerprint converged by the microlens 41, the position of the light shielding layer where each collimating aperture is located has a direct triangular similarity relationship with the opening size of the collimating aperture. The aperture of the collimation hole is phi, and the following can be obtained according to the triangle similarity principle:
Figure BDA0002858438920000101
d is obtained by conversion1(F-H) × (1- Φ/CD). Similarly, in consideration of the actual tolerance of the light-shielding layer, d is provided in the embodiment of the present invention1In [ -0.2X (F-H) ((1-phi)/CD), 0.2X (F-H) ((1-phi)/CD)]Within the range of the interval, the signal-to-noise ratio of the photosensitive element 210 can be ensured to be over 80%, the accurate identification of the photosensitive element on the fingerprint signal is ensured, and the error is reduced.
In the fingerprint identification panel shown in fig. 6, the collimating structure layer 30 includes two light shielding layers 31, which is only one embodiment of the present invention, and in other embodiments of the present invention, the collimating structure layer may include 1-5 light shielding layers. Fig. 9 and 10 are partial enlarged views of two fingerprint identification panels provided by embodiments of the present invention, and referring to fig. 9, the fingerprint identification panel includes three light shielding layers 31 arranged in a collimating structure layer 30, and two adjacent light shielding layers are separated by an optical adhesive layer. Referring to fig. 10, in the fingerprint identification panel, only one thick light shielding layer 31 is disposed in the alignment structure layer 30.
With continued reference to fig. 6 and 9, in the embodiment of the present invention, the aperture diameter Φ of the collimating hole 310 in each light shielding layer 31 may be set to satisfy: phi is less than or equal to 2 CD/3; wherein CD is the aperture of the microlens 41 corresponding to the collimating hole 310. The aperture of the collimating hole 310 is not greater than two-thirds of the aperture of the microlens 41, so that the collimating hole 310 can be ensured to have a smaller opening, and interference of stray light with a larger incident angle can be effectively isolated. Furthermore, according to the size of the microlens 41 under practical process conditions, the aperture Φ of the collimating hole 310 in the embodiment of the present invention can be set to satisfy: phi is not less than 3 mu m and not more than 8 mu m, and the aperture phi of the collimating holes 310 can be set to be 5 mu m or 6 mu m.
In the embodiment of the present invention, the thickness of the light shielding layer 31 depends on the distance between the microlens 41 and the photosensitive element 210, and taking the photosensitive element 210 disposed near the focal plane of the microlens 41 as an example, the maximum thickness of the light shielding layer 31 is F-H. The light-shielding layer 31 mainly functions to block stray light having a large incident angle from being disturbed, and therefore, the light-shielding layer 31 is preferably formed of a material having a good light-shielding effect. Specifically, the light shielding layer may be made of a metal material or a black matrix light shielding material, and preferably, the light transmittance of the light shielding layer in the embodiment of the present invention is less than or equal to 3% to ensure a light shielding effect on stray light and a collimation effect on a fingerprint signal.
Based on the same invention concept, the embodiment of the invention also provides a fingerprint identification display module. Fig. 11 is a schematic structural diagram of a fingerprint identification display module according to an embodiment of the present invention, referring to fig. 11, the fingerprint identification display module includes any one of the fingerprint identification panels 100 according to the above embodiments, and further includes a display panel 200, where the fingerprint identification panel 100 is located on a side of the display panel 200 away from a light emitting side.
In this fingerprint identification display module assembly, display panel 200 is mainly responsible for showing, and fingerprint identification panel 100 is responsible for carrying out fingerprint identification, and two panels accessible light-transmitting optics gluing layer 300 bond. Meanwhile, the display panel 200 also needs to be transparent, and in this case, a finger can be incident on the fingerprint identification panel 100 through the display panel 200 after forming a reflected light, and then the fingerprint identification panel 100 performs fingerprint identification. It should be noted that, in the fingerprint identification display module of the present invention, the light source required for fingerprint identification may be the display light of the display panel 200, or a fingerprint identification light source may be additionally added to the module. Except for the display panel 200 and the fingerprint identification panel 100, the fingerprint identification display module can also be provided with a chip for displaying or fingerprint identification. In addition, a person skilled in the art can also set a touch layer on the light-emitting side of the display panel to implement a touch function, which is not limited herein. Because the fingerprint identification display module that this embodiment provided includes any kind of fingerprint identification panel that above-mentioned embodiment provided, therefore possess with this fingerprint identification panel the same or corresponding beneficial effect, here is no longer repeated.
With continued reference to fig. 11, in the present embodiment, the display panel 200 includes an array substrate 201, where the array substrate 201 includes a substrate; the substrate in the optional fingerprint identification panel 100 and the substrate in the display panel are both flexible. In other words, both the display panel 200 and the fingerprint identification panel 100 in this embodiment can be configured as flexible panels, and at this time, the bending region can also realize the fingerprint identification function, and can meet the requirement of fingerprint identification of the curved screen.
Fig. 12 is a schematic structural view of another fingerprint identification display module according to an embodiment of the present invention, and referring to fig. 12, in another embodiment of the present invention, a fingerprint identification panel 100 and a display panel 200 are bonded by an optical adhesive layer 300, and the optical adhesive layer 300 is reused as a light-transmitting layer 50 in the fingerprint identification panel 100. At this time, the optical adhesive layer 300 is not only responsible for aligning and attaching the fingerprint identification panel 100 and the display panel 200, but also used for providing a refractive interface with a refractive index difference with the micro lens in the fingerprint identification panel 100, so that the micro lens has a better light converging capability, and the fingerprint identification sensitivity of the fingerprint identification panel is improved.
Fig. 13 is a schematic structural diagram of another fingerprint identification display module according to an embodiment of the present invention, and referring to fig. 13, an optional fingerprint identification panel 100 and a display panel 200 are bonded by a glue frame 410 to form an air layer 420; the orthographic projection of the rubber frame 410 on the circuit layer 20 of the fingerprint identification panel 100 surrounds the plurality of fingerprint identification units 21 in the circuit layer 20; the air layer 420 is multiplexed as the light-transmitting layer 50 in the fingerprint identification panel 100.
The adhesive frame 410 adheres the fingerprint identification panel 100 to the back of the display panel 200, so that a closed air layer 420 with a low refractive index can be formed between the fingerprint identification panel 100 and the display panel 200, and at the moment, two sides of a refractive interface formed by the micro-lenses in the fingerprint identification panel 100 and the air layer have a larger refractive index difference, so that the light convergence effect of the micro-lenses can be obviously improved, and the sensitivity of fingerprint identification is ensured.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (16)

1. A fingerprint identification panel is characterized by comprising a substrate, a circuit layer, a collimation structure layer, a micro-lens layer and a light transmission layer which are sequentially stacked;
the circuit layer comprises a plurality of fingerprint identification units, and each fingerprint identification unit comprises at least one photosensitive element;
the alignment structure layer comprises at least one light shielding layer, and the light shielding layer comprises a plurality of alignment holes;
the microlens layer includes a plurality of microlenses; in the direction perpendicular to the plane of the substrate, the micro lenses and the collimating holes are in one-to-one correspondence, orthographic projections of the corresponding micro lenses and the collimating holes are at least partially overlapped, and an overlapped area is at least partially overlapped with the orthographic projection of the photosensitive element;
the refractive index of the light-transmitting layer is smaller than that of the micro lens.
2. The fingerprint identification panel of claim 1, wherein the fingerprint identification unit comprises a light sensing element; in the direction perpendicular to the plane of the substrate, orthographic projection overlapping areas of a plurality of the micro lenses and the corresponding collimating holes at least partially overlap orthographic projections of the photosensitive elements;
alternatively, the fingerprint identification unit comprises a plurality of photosensitive elements; in the direction perpendicular to the plane of the substrate, the micro lenses and the photosensitive elements are in one-to-one correspondence, and the orthographic projections of the corresponding micro lenses, the collimating holes and the photosensitive elements have a common overlapping area.
3. The fingerprint identification panel of claim 1, wherein the difference Δ n in refractive index between the micro-lenses and the light transmissive layer satisfies: delta n is more than or equal to 0.3.
4. The fingerprint identification panel of claim 3, wherein the transparent layer has a refractive index n1Satisfies the following conditions: n is more than or equal to 11Less than or equal to 1.5; refractive index n of the microlens2Satisfies the following conditions: n is more than or equal to 1.52≤2.5。
5. The fingerprint recognition panel of claim 3, wherein the focal length F of the micro-lenses satisfies: f is more than or equal to 5 mu m and less than or equal to 30 mu m.
6. The fingerprint identification panel of claim 5, wherein the ratio of the thickness H and the aperture CD of the micro-lenses satisfies: 1/20 is less than or equal to H/CD is less than or equal to 1/2.
7. Fingerprint identification panel according to claim 5, characterized in that the aperture Φ of the collimating holes satisfies: phi is less than or equal to 2 CD/3; wherein, CD is the aperture of the micro lens corresponding to the collimating hole.
8. The panel of claim 5, wherein the light shielding layer of the collimating structure layer closest to the photosensitive element is spaced from the micro-lenses by a distance d0Satisfies the following conditions: d is not more than 0.2 x (F-H)0Less than or equal to 0.2 (F-H); wherein F is the focal length of the microlens, and H is the thickness of the microlens.
9. The fingerprint identification panel of claim 5, wherein the light shielding layer in the collimating structure layer is spaced from the micro-lenses by a distance d1Satisfies the following conditions: -0.2 (F-H) (1-phi/CD) is less than or equal to d1Less than or equal to 0.2 (F-H) (1-phi/CD); wherein, F is the focal length of the micro-lens, H is the thickness of the micro-lens, phi is the aperture of the collimating hole in the light shielding layer, and CD is the aperture of the micro-lens corresponding to the collimating hole.
10. Fingerprint identification panel according to claim 5, characterized in that the aperture Φ of the collimating holes satisfies: phi is more than or equal to 3 mu m and less than or equal to 8 mu m.
11. The fingerprint recognition panel of claim 1, wherein the period C of the fingerprint recognition unit satisfies: c is more than or equal to 0.03mm and less than or equal to 0.15mm, and the size L of the fingerprint identification unit satisfies the following conditions: l is more than or equal to 0.001mm and less than or equal to 0.145 mm.
12. The fingerprint identification panel of claim 1, wherein the light-shielding layer has a light transmittance T satisfying: t is less than or equal to 3 percent.
13. A fingerprint identification display module, characterized in that, includes the fingerprint identification panel of any one of claims 1-12, still includes the display panel, the fingerprint identification panel is located the display panel deviates from the one side of light-emitting side.
14. The module of claim 13, wherein the fingerprint identification panel and the display panel are bonded by an optical adhesive layer that is reused as a light transmissive layer in the fingerprint identification panel.
15. The module of claim 13, wherein the fingerprint sensor panel is bonded to the display panel by a frame and forms an air layer;
the orthographic projection of the rubber frame on the circuit layer of the fingerprint identification panel surrounds the plurality of fingerprint identification units in the circuit layer; the air layer is multiplexed as a light-transmitting layer in the fingerprint identification panel.
16. The fingerprint identification display module of claim 13, wherein the display panel comprises an array substrate comprising a substrate; the substrate in the display panel and the substrate in the fingerprint identification panel are both flexible.
CN202011552675.9A 2020-12-24 2020-12-24 Fingerprint identification panel and fingerprint identification display module Pending CN112699761A (en)

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Application publication date: 20210423