CN209328045U - For shielding the recognizer component of lower optical finger print - Google Patents

Abstract

The utility model provides a kind of for shielding the recognizer component of lower optical finger print, comprising: substrate；The light sensitive component being set to below substrate；The primary diaphragm unit being set between substrate and light sensitive component comprising the first quarter wave plate and First Line polaroid, the first quarter wave plate is between First Line polaroid and substrate；The secondary diaphragm unit being set to above substrate comprising the second quarter wave plate and the second line polarisation piece, the second quarter wave plate is between the second line polarisation piece and substrate；At first angle between the optical axis of first quarter wave plate and the polarization direction of First Line polaroid, at second angle between the optical axis of second quarter wave plate and the polarization direction of the second line polarisation piece, along the direction that secondary diaphragm unit is directed toward primary diaphragm unit, one of them is+45 ° ± 5 ° for first angle and second angle, another is -45 ° ± 5 °.The recognizer component of the utility model is unattenuated or smaller decaying echo signal light, to improve image quality.

Description

A discernment subassembly for optical fingerprint under screen

Technical Field

The utility model relates to an optical fingerprint field especially relates to an identification component that is used for optical fingerprint under screen.

Background

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

The fingerprint under the screen can be applied to the OLED substrate by adopting a fingerprint sensor imaging method at present. Specifically, light emitted by the OLED substrate arranged in the display panel reaches a finger through the 1/4 wave plate and the linear polarizer arranged on the outer surface of the display panel, and light reflected by the finger returns to the display panel after being reflected again through the linear polarizer and the 1/4 wave plate and penetrates through the light-transmitting area of the display panel to reach the fingerprint sensor, so that imaging is performed.

Thus, there are two portions of light that reach the light sensing element. And part of the signal light is reflected by the finger and is used for imaging. Another part is noise light emitted directly down from the substrate in the display panel, which can degrade the imaging quality.

It should be noted that the above background description is only for the sake of clarity and complete description of the technical solutions of the present invention, and is set forth for facilitating understanding of those skilled in the art. These solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present invention.

SUMMERY OF THE UTILITY MODEL

Based on aforementioned prior art defect, the embodiment of the utility model provides an identification component for optical fingerprint under screen, its when the non-reflection noise light of decay, do not attenuate or less attenuation target signal light to can improve image quality.

In order to achieve the above object, the present invention provides the following technical solutions.

An identification assembly for an underscreen optical fingerprint, comprising:

a substrate provided with a light emitting unit;

the light sensing element is arranged below the substrate and at least can receive target signal light reflected by a target organism above the substrate;

the first membrane unit is arranged between the substrate and the light sensing element and comprises a first 1/4 wave plate and a first linear polarizer, and the first 1/4 wave plate is positioned between the first linear polarizer and the substrate;

a second membrane unit disposed over the substrate, the second membrane unit including a second 1/4 wave plate and a second linear polarizer, the second 1/4 wave plate being located between the second linear polarizer and the substrate;

wherein a first angle is formed between the optical axis of the first 1/4 wave plate and the polarization direction of the first linear polarizer, and a second angle is formed between the optical axis of the second 1/4 wave plate and the polarization direction of the second linear polarizer;

and, along the viewing angle direction of the second diaphragm unit pointing to the first diaphragm unit, one of the first angle and the second angle is +45 ° ± 5 °, and the other is-45 ° ± 5 °.

Preferably, the first angle is +45 ° ± 5 °, the second angle is-45 ° ± 5 °; or,

the first angle is-45 ° ± 5 °, and the second angle is +45 ° ± 5 °.

Preferably, the first and second diaphragm units are both located on a propagation path of the target signal light.

Preferably, the first and second diaphragm units at least partially overlap.

Preferably, a projection of the second membrane unit towards the first membrane unit at least partially covers the first membrane unit.

Preferably, a cover plate is arranged on the surface of the second membrane unit, which faces away from the substrate, and the cover plate has a light-transmitting area, and an operation area for the target organism to press is formed on the light-transmitting area.

Preferably, the light sensing element is disposed in a fingerprint module, and the first film unit forms a part of the fingerprint module structure.

Preferably, the fingerprint module is provided with a support for supporting the light sensing element, and the first membrane unit is arranged on the support.

Preferably, the bracket defines an accommodating space, and the accommodating space is provided with a lens barrel; the target signal light can reach the light sensing element through the lens cone;

the first diaphragm unit is at least partially accommodated in the accommodating space; or,

the first diaphragm unit is at least partially disposed in the lens barrel.

Preferably, the first diaphragm unit is supported at an end of the support; or,

the first linear polarizer is accommodated in an accommodating space defined by the bracket, and the first 1/4 wave plate is supported at the end of the bracket.

Preferably, a plurality of optical lenses are further disposed between the light-sensing element and the substrate.

Preferably, the first membrane unit is located above all the optical lenses; or,

the first diaphragm unit is positioned below all the optical lenses; or,

the first membrane unit is positioned between any two adjacent optical lenses; or;

one or more optical lenses are arranged between the first 1/4 wave plate and the first linear polarizer in a spaced mode.

Preferably, a plurality of the optical lenses are arranged in the accommodating space; or,

a plurality of the optical lenses are disposed in the lens barrel.

Preferably, an optical filter is further disposed between the substrate and the light-sensing element, and the optical filter is configured to at least partially filter noise light in the target signal light.

Preferably, the filter is located above the first membrane unit; or,

the optical filter is positioned between the first 1/4 wave plate and the first linear polarizer; or,

the optical filter is positioned between the first membrane unit and the light sensing element.

Preferably, the optical filter is arranged in the accommodating space; or,

the optical filter is disposed in the lens barrel.

The first film unit including the first 1/4 wave plate and the first linear polarizer is disposed between the elements, so that the brightness of the non-reflected noise light directly emitted from the substrate to the light sensing element is attenuated after passing through the first 1/4 wave plate and the first linear polarizer. Thus, the luminance of the non-reflected noise light can be reduced, and the imaging quality can be improved.

In addition, by configuring the second diaphragm unit including the second 1/4 wave plate and the second linear polarizer and adapting the direction and the difference between the first angle formed between the first 1/4 wave plate and the first linear polarizer and the second angle formed between the second 1/4 wave plate and the second linear polarizer, the target signal light is not attenuated or less attenuated while the non-reflected noise light is attenuated. Therefore, the signal-to-noise ratio of the light received by the light sensing element is improved, and the imaging quality is greatly improved.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, which specify the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the present invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for helping the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. The skilled person in the art can, under the teaching of the present invention, choose various possible shapes and proportional dimensions to implement the invention according to the specific situation. In the drawings:

fig. 1 is a schematic structural diagram of an identification component according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of an identification component according to a second embodiment of the present invention;

fig. 3 is a schematic structural diagram of an identification component according to a third embodiment of the present invention;

fig. 4 is a schematic structural diagram of an identification component according to a fourth embodiment of the present invention;

fig. 5 is a schematic structural diagram of an identification component according to a fifth embodiment of the present invention;

fig. 6 is a schematic structural view of an identification component according to a sixth embodiment of the present invention;

fig. 7 is a schematic structural diagram of an identification component according to a seventh embodiment of the present invention;

FIG. 8A is a schematic diagram of the first 1/4 wave plate having an angle of +45 ° ± 5 ° between the optic axis and the polarization direction of the first linear polarizer;

FIG. 8B is a diagram of the second 1/4 wave plate having an angle of-45 ° ± 5 ° between the optic axis and the polarization direction of the second linear polarizer;

FIG. 9A is a schematic diagram of the first 1/4 wave plate having an optical axis at-45 ° ± 5 ° with respect to the polarization direction of the first linear polarizer;

FIG. 9B is a schematic diagram of the angle between the optical axis of the second 1/4 wave plate and the polarization direction of the second linear polarizer being +45 ° ± 5 °.

Detailed Description

In order to make the technical solutions in the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a single embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In this specification, the direction pointing to or facing the user is defined as "up", and the opposite direction, or the direction facing away from the user is defined as "down" in the normal use state of the identification assembly for optical fingerprint under screen according to the embodiment of the present invention.

Specifically, when the identification device according to the embodiment of the present invention is disposed in an electronic apparatus, a direction in which the substrate 3 points or faces a user is defined as "up", and a direction opposite thereto, or a direction away from the user is defined as "down".

More specifically, an upward direction illustrated in fig. 1 to 7 is defined as "up", and a downward direction illustrated in fig. 1 to 7 is defined as "down".

It should be noted that the definitions of the directions in the present specification are only for convenience of describing the technical solution of the present invention, and do not limit the directions of the recognition component in other scenarios, including but not limited to use, test, transportation, and manufacture, which may cause the recognition component to be inverted in orientation or changed in position.

The embodiment of the utility model provides an identification assembly, it can apply to including but not limited to under the screen fingerprint unblock, user authentication, authority acquire in the scene such as.

Specifically, when the utility model discloses when the discernment subassembly was disposed in electronic equipment, electronic equipment can acquire user's fingerprint characteristic information based on this discernment subassembly for match with the fingerprint information of storage, with the realization to current user's authentication, thereby confirm whether it has corresponding authority to carry out relevant operation to electronic equipment.

It should be noted that the fingerprint information obtained as described above is only one common example of the user's biometric features. Within the scope that can be envisioned, those skilled in the art can extend the technical solution of the embodiments of the present invention to be applied in any suitable biometric authentication scenario. For example, a scene for verifying by acquiring biometric information of the iris of the user is not limited in the embodiments of the present invention.

The following is set forth in a scenario in which user fingerprint information is obtained as a main description. However, as can be seen from the above description, the scope of the embodiments of the present invention is not limited thereto.

The utility model discloses an identification component for optical fingerprint under screen can be used in electronic equipment such as including but not limited to mobile smart mobile phone, dull and stereotyped electronic equipment, computer, GPS navigator, personal digital assistant, intelligent wearable equipment.

As shown in fig. 1 to 7, an identification assembly for an optical fingerprint under a screen according to an embodiment of the present invention may include a substrate 3 configured with a light emitting unit. The substrate 3 may be made of a light-transmitting material such as glass, PI resin, or the like. The light emitting unit configured on the substrate 3 is specifically an OLED or an LED, etc., and the embodiment of the present invention does not limit this.

The substrate 3 is thus a self-luminous substrate, and the light-emitting unit of the substrate 3 is used not only for display but also as an excitation light source for emitting excitation light to the user's finger, which is reflected by the user's finger to form target signal light ② carrying fingerprint information.

Further, the identification component may be further configured with a light sensor 4 disposed below the substrate 3. the light sensor 4 is at least configured to receive the target signal light ② reflected from the target organism above the substrate 3, and convert the target signal light ② into an electrical signal to generate a fingerprint image.

The light sensing element 4 can further send the fingerprint image to an image processor connected with the signal, the image processor performs image processing to obtain a fingerprint signal, and performs fingerprint identification on the fingerprint signal through an algorithm.

The light sensing element 4 may be a fingerprint chip only. I.e. the fingerprint chip is constructed separately to form the light-sensing element 4.

Alternatively, the light-sensing element 4 may be a fingerprint sensor equipped with a fingerprint chip. I.e. a fingerprint sensor configuration provided with a fingerprint chip, forms the light sensing element 4.

Alternatively, the light sensing element 4 can also be a fingerprint sensor array (as in the known embodiment provided with the publication number CN 203909812U). The fingerprint sensor array may include a plurality of fingerprint sensors, each configured with a fingerprint chip.

In other words, the light-sensing element 4 may be of any suitable configuration configured with a fingerprint chip.

The first film unit 1 is provided between the substrate 3 and the light-sensing element 4. The first film unit 1 may include a first 1/4 wave plate 1a and a first linear polarizer 1 b. Also, the first 1/4 wave plate 1a is located between the first linear polarizer 1b and the substrate 3, i.e. the first 1/4 wave plate 1a is located above the first linear polarizer 1 b.

The first 1/4 wave plate 1a and the first linear polarizer 1b may be made of organic materials or inorganic materials as long as they can perform the phase retardation function and the polarization function, respectively.

The first 1/4 wave plate 1a and the first linear polarizer 1b may be stacked on each other, that is, the lower surface of the first 1/4 wave plate 1a contacts and adheres to the upper surface of the first linear polarizer 1 b. Of course, the first 1/4 wave plate 1a and the first linear polarizer 1b may be disposed at intervals, that is, the lower surface of the first 1/4 wave plate 1a is isolated from the upper surface of the first linear polarizer 1 b.

In addition, the first 1/4 wave plate 1a and the first linear polarizer 1b may form the first film unit 1, which is disposed on the light sensing element 4, that is, the lower surface of the first film unit 1 is attached to the upper surface of the light sensing element 4. Also, the first film unit 1 may be formed on the upper surface of the light sensing element 4 through a semiconductor packaging process or an IC chip manufacturing process. In this way, the first film unit 1 and the light sensing element 4 can be integrated, so that the first film unit 1 and the light sensing element 4 can form a single integral component.

Of course, the first film unit 1 may also be disposed at an interval from the light sensing element 4, i.e., the lower surface of the first linear polarizer 1b is isolated from the upper surface of the light sensing element 4.

In addition, at least a first 1/4 wave plate 1a may be implanted in the substrate 3. Specifically, only the first 1/4 wave plate 1a may be implanted in the substrate 3, and the first linear polarizer 1b and the light sensing element 4 are located outside the substrate 3. Alternatively, the first 1/4 wave plate 1a and the first linear polarizer 1b are both implanted in the substrate 3, and the light sensing element 4 is located outside the substrate 3. Alternatively, the first 1/4 wave plate 1a, the first linear polarizer 1b and the light sensing element 4 are all implanted in the substrate 3.

By implanting at least the first 1/4 wave plate 1a into the substrate 3, the structure can be integrated. Thereby make the utility model discloses the identification component of embodiment is more simple and convenient when the equipment.

Further, as shown in fig. 1, the first film unit 1 may be provided on the lower surface of the substrate 3 in a bonded manner. That is, the upper surface of the first 1/4 wave plate 1a included in the first diaphragm unit 1 is bonded to the lower surface of the substrate 3.

As shown in fig. 2 to 7, the light sensor 4 can be disposed in the fingerprint module 9, and the first film unit 1 can be disposed in the fingerprint module 9 to form a part of the structure of the fingerprint module 9.

Specifically, as shown in fig. 3 to 7, the fingerprint module 9 may be configured with a support 6 supporting the light sensing element 4, and the first film unit 1 is disposed on the support 6. The bracket 6 defines a receiving space 6a, and the receiving space 6a is open at least at the upper end, and the circumferential direction thereof may be closed, or may be non-closed or open.

For example, the holder 6 may be a cylindrical body with an open upper end, and the wall of the cylindrical body is not provided with any through structure, such as a through hole, an opening, etc., for communicating the internal space and the external space. The defined accommodation space 6a is thus circumferentially closed.

Alternatively, the holder 6 may be a cylindrical body having a wall provided with a through structure, such as a through hole or an opening, for communicating the internal space and the external space. Alternatively, the holder 6 has a casing structure that is not closed in the circumferential direction, and may have an arc-shaped or C-shaped cross section in plan view, for example. Still alternatively, the support 6 may be a plurality of columns arranged at intervals in the circumferential direction, thereby forming a structure similar to a fence. Thereby, the defined accommodating space 6a is not closed or opened.

The light sensing element 4 is accommodated in the accommodating space 6a and fixed on the inner wall of the accommodating space 6 a. In order to reserve a sufficient installation space for other components, the light sensing element 4 is preferably installed at the bottom of the accommodating space 6 a.

The first diaphragm unit 1 may be disposed on the support 6. Thereby, the first membrane unit 1 forms part of the structure of the fingerprint module 9 itself. The first diaphragm unit 1 becomes a part of the structure of the fingerprint module 9 itself, and may be formed integrally with the support 6 before the fingerprint module 9 is assembled. I.e. the first membrane unit 1 is built into the fingerprint module 9. Alternatively, the first diaphragm unit 1 is built into the support 6.

Thus, by providing the first film unit 1 including the first linear polarizer 1b and the first 1/4 wave plate 1a on the support 6, the integration of the structure can be realized, thereby facilitating the assembly of the fingerprint module 9.

Further, the lens barrel 10 may be disposed in the accommodating space 6a, and the target signal light ② may reach the optical sensor 4 through the lens barrel 10. specifically, the lens barrel 10 may be disposed with any one or more of the first diaphragm unit 1, the optical filter 7 mentioned below, the optical lens 8, and the like, and the target signal light ② may reach the optical sensor 4 through the structure disposed in the lens barrel 10.

The first membrane unit 1 may be disposed on the bracket 6 in such a manner that the first membrane unit 1 is directly disposed on the bracket 6; alternatively, the first diaphragm unit 1 is at least partially disposed in the lens barrel 10, indirectly disposed on the mount 6 through the lens barrel 10.

The first diaphragm unit 1 may be at least partially disposed in the lens barrel 10, and the first diaphragm unit 1 is entirely disposed in the lens barrel 10 (as in the embodiment illustrated in fig. 5 to 6).

Alternatively, only the first linear polarizer 1b included in the first film unit 1 is disposed in the lens barrel 10, and the first 1/4 wave plate 1a is located outside the lens barrel 10 (not shown). The first 1/4 wave plate 1a is located outside the barrel 10. the first 1/4 wave plate 1a is supported on the top of the support 6.

The arrangement of the first membrane unit 1 directly on the carrier 6 can be such that the first membrane unit 1 is at least partially embedded in the carrier 6. Specifically, the entire first diaphragm unit 1 may be accommodated in the accommodating space 6a (as in the embodiment illustrated in fig. 2 to 4).

Alternatively, only the first linear polarizer 1b included in the first film unit 1 is accommodated in the accommodating space 6a, and the first 1/4 wave plate 1a is located outside the accommodating space 6a (not shown). The first 1/4 wave plate 1a may be located outside the accommodating space 6a, and the first 1/4 wave plate 1a is supported on the top of the bracket 6.

Alternatively, the first diaphragm unit 1 may be entirely located outside the accommodating space 6a (as in the embodiment illustrated in fig. 7). At this time, the first diaphragm unit 1 is supported on the top end of the frame 6.

Further, an optical filter 7 may be disposed between the light sensing element 4 and the substrate 3, and the optical filter 7 is configured to at least partially filter noise light mixed in the target signal light ②, so as to improve the sensing of the light sensing element 4 on the received light and improve the imaging quality.

Specifically, the light emitting unit disposed on the substrate 3 serves as an excitation light source, and the excitation light emitted by the excitation light source is generally visible light, and the target signal light ② is also visible light.

The optical filter 7 can allow the target signal light ② to pass through, and can filter noise light (including invisible light such as infrared light and near infrared light) in ambient light (e.g., sunlight). therefore, when the electronic device equipped with the identification component of the embodiment of the present invention is used outdoors, the optical filter 7 can effectively filter noise light in ambient light, thereby improving the signal-to-noise ratio of light reaching the light-sensing element 4.

The filter 7 may be disposed on a light-transmissive carrier, or the filter 7 may be supported by a light-transmissive carrier. For example, the light-transmitting support may be a glass sheet, and the optical filter 7 may be disposed on the upper surface or the lower surface of the glass sheet in a bonded manner so that the surface of the optical filter 7 is bonded to the surface of the glass sheet. The filter 7 may be attached to the surface of the light-transmitting carrier in the form of a film. The filters 7 may be provided on both the upper and lower surfaces of the light-transmitting support.

Alternatively, the optical filter 7 may be implanted in a light-transmissive carrier. That is, the optical filter 7 is integrated with the light-transmitting carrier, and the light-transmitting carrier has a function of filtering noise light. The light-transmitting support may be a single-layer member and the optical filter 7 may be formed in the light-transmitting support in the form of an optical filter coating. Also, the optical filter coating may be distributed discretely or continuously in the light-transmissive carrier.

Alternatively, the light-transmitting carrier may be plural. The optical filter 7 may be attached between two adjacent light-transmitting carriers in the form of a film, or may be formed in one or more light-transmitting carriers in the form of an optical filter coating.

Similarly, as long as the optical filter 7 is located between the light sensing element 4 and the substrate 3, the relative positional relationship and the contact relationship between the optical filter 7 and the first film unit 1 and the light sensing element 4 may not be limited.

For example, the filter 7 may be located above the first membrane unit 1 (as in the embodiments illustrated in fig. 2 and 4). Alternatively, the filter 7 may be located below the first membrane unit 1 (as in the embodiments illustrated in fig. 3, 5 to 7). Alternatively, the optical filter 7 may also be located between the first linear polarizer 1b and the first 1/4 wave plate 1a (not shown), that is, the optical filter 7 is sandwiched between the first film unit 1.

The filter 7 and the first membrane unit 1 may be stacked on each other or spaced apart from each other. Similarly, the optical filter 7 and the light sensing element 4 may be stacked on each other or spaced apart from each other.

In addition, in order to make the projection of the first film unit 1 at least partially cover the light sensing element 4, so as to attenuate the brightness of the non-reflected noise light (light emitted from the substrate 3 of the electronic device directly towards the light sensing element 4, which does not carry fingerprint information because it is not reflected by a finger, and makes the light sensing element 4 reach light saturation in advance, and reduce the amount of signal light reflected by the finger received by the light sensing element 4, thereby reducing the signal-to-noise ratio of the light received by the light sensing element 4 and deteriorating the imaging quality) directed to the light sensing element 4 as much as possible, a light condensing structure can be adopted to realize the convergence of wide-angle light between the light reaching the light sensing element 4.

Specifically, the light-collecting structure is composed of a plurality of optical lenses 8, and the plurality of optical lenses 8 are located between the light-sensing element 4 and the substrate 3. The optical lens 8 may include convex, micro, and concave lenses, etc., and the convex, micro, and concave lenses may be aspherical convex, micro, and concave lenses. I.e. the optical lens 8 is an unconventional lens.

Like this, optical lens piece 8 not only can assemble light to can realize assembling the comparatively dispersed signal light of wide angle within range to light sense element 4 on, can also correct optical distortion, carry out optical imaging, thereby can make things convenient for light sense element 4 to the collection of fingerprint figure, promote the imaging quality.

The plurality of optical lenses 8 may be disposed on the lower surface of the substrate 3, and the substrate 3 may provide a position and support for the plurality of optical lenses 8. Alternatively, a plurality of optical lenses 8 may be disposed on the light sensing element 4, so that the light sensing element 4 may provide a disposing position and support for the plurality of optical lenses 8.

Of course, the plurality of optical lenses 8 may be spaced apart from the light-sensing elements 4. Specifically, a light-transmitting plate or a light-transmitting sheet for disposing the plurality of optical lenses 8 may be disposed above the light-sensing element 4, thereby achieving the spaced disposition of the plurality of optical lenses 8 and the light-sensing element 4.

Alternatively, when the light sensing element 4 of the identification component of the embodiment of the present invention is disposed in the fingerprint module 9, the plurality of optical lenses 8 may be isolated from the light sensing element 4 by being fixed on the inner wall of the bracket 6.

In order not to affect the imaging quality of the light sensing element 4, when the plurality of optical lenses 8 are spaced apart from the light sensing element 4, the spacing distance between the optical lens 8 positioned at the lowest position of the plurality of optical lenses 8 and the light sensing element 4 is equal to or close to the focal length of the optical lens 8.

Specifically, the difference between the spacing distance between the lowermost optical lens 8 and the light sensing element 4 is within the predetermined range [0, Φ ], i.e., the spacing distance between the lowermost optical lens 8 and the light sensing element 4 is considered to be equal to or close to the focal length of the optical lens 8. Wherein, the upper limit value Φ of predetermined range can be set for according to actual conditions, the embodiment of the utility model provides a do not restrict this.

Similarly, as long as the plurality of optical lenses 8 are located between the light sensing elements 4 and the substrate 3, the relative positional relationship and the contact relationship between the plurality of optical lenses 8 and the first film unit 1 and the light sensing elements 4 may not be limited.

For example, the first membrane unit 1 may be located above all optical lenses 8 (as in the embodiments illustrated in fig. 6 to 7). Alternatively, the first membrane unit 1 may be located below all optical lenses 8 (as in the embodiments illustrated in fig. 2 to 4). Alternatively, the first film unit 1 is located between any two adjacent optical lenses 8 (as in the embodiment illustrated in fig. 5). Still alternatively, one or more optical lenses 8 (not shown) are spaced between the first linear polarizer 1b and the first 1/4 wave plate 1 a.

Thereby, by providing a plurality of optical lenses 8 having a light condensing function, even if the first film sheet unit 1 of a smaller size is arranged, it is possible to achieve at least partial coverage of the light sensing element 4 by the projection of the first film sheet unit 1. That is to say, through a plurality of optical lens 8 that the configuration has the function of assembling to wide angle light, can reduce the size of first diaphragm unit 1 to be favorable to fingerprint module 9's structure to integrate.

The filter 7 and the plurality of optical lenses 8 are both located above the first membrane unit 1, and the positional relationship therebetween may be relatively free. Specifically, the optical filter 7 may be located above or below all the optical lenses 8, or may be inserted between the optical lenses 8, which is not limited in the embodiment of the present invention.

Further, the optical filter 7 and the plurality of optical lenses 8 may be disposed in the accommodating space 6a of the holder 6. Alternatively, when the lens barrel 10 is provided in the accommodating space 6a, the optical filter 7 and the plurality of optical lenses 8 may be provided in the lens barrel 10.

Further, the lens barrel 10 can move in the accommodating space 6a of the holder 6 in a direction to approach or separate from the light-sensing element 4. Specifically, the outer wall of the lens barrel 10 may be screw-fitted with the inner wall of the accommodating space 6 a. In this way, the lens barrel 10 is moved up and down by changing the screwing length of the lens barrel 10 in the accommodation space 6 a.

Thereby, when the plurality of optical lenses 8 are provided in the lens barrel 10, by the movement of the lens barrel 10, the change of the distance between the optical lens 8 positioned lowermost among the plurality of optical lenses 8 and the light sensing element 4 can be achieved, so that the focusing of the optical lens 8 positioned lowermost can be performed.

The identification assembly may further be provided with a second membrane unit 2 located above the substrate 3. The second diaphragm unit 2 may include a second 1/4 wave plate 2a and a second linear polarizer 2 b. And, the second 1/4 wave plate 2a is located between the second linear polarizer 2b and the substrate 3, i.e. the second linear polarizer 2b is located above the second 1/4 wave plate 2 a.

Similarly, regarding the second 1/4 wave plate 2a and the second linear polarizer 2b included in the second film unit 2, and the positional relationship between the second film unit 2 and the substrate 3, refer to the above description of the first film unit 1, and the embodiments of the present invention are not repeated herein.

As shown in fig. 1, the second film sheet unit 2 is disposed on the upper surface of the substrate 3 in a bonded manner. That is, the lower surface of the second 1/4 wave plate 2a included in the second diaphragm unit 2 is bonded to the upper surface of the substrate 3.

Further, a surface (i.e., an upper surface) of the second membrane unit 2 facing away from the substrate 3 is provided with a cover plate 5, and the cover plate 5 has a light-transmitting region on which an operation region for a target living body to press is formed.

In this embodiment, the light-transmitting region may occupy the upper surface of the cover plate 5. The cover 5 may be made of a light-transmitting material as a whole, and no light-opaque region is present on the upper surface.

Alternatively, the light-transmitting region may occupy only a part of the upper surface of the cover 5. For example, the cover plate 5 may include a central display region made of a light-transmitting material and a bezel region made of a light-opaque material. Wherein, the central display area can constitute the transparent area.

And, a part or the whole of the light transmission region constitutes the operation region.

The cover 5 having the light-transmitting region may be specifically a glass cover or a sapphire cover. And the upper surface of the cap plate 5 may be provided with a protective layer. It should be understood that the pressing of the target organism may actually be the pressing of the target organism on the cover plate 5, or may also be the pressing on a protective layer provided on the upper surface of the cover plate 5.

As shown in fig. 1 to 7, the first diaphragm unit 1 and the second diaphragm unit 2 are both located on the propagation path of the target signal light ②, specifically, the first diaphragm unit 1 is located downstream of the second diaphragm unit 2 along the propagation path of the target signal light ②, so that the target signal light ② reflected by a finger can both transmit through the first diaphragm unit 1 and the second diaphragm unit 2, and the effectiveness of processing the target signal light ② is ensured.

In order to achieve the above object, the first diaphragm unit 1 and the second diaphragm unit 2 are at least partially overlapped. Alternatively, the projection of the second membrane unit 2 towards the first membrane unit 1 at least partially covers the first membrane unit 1. As illustrated in fig. 1 to 7, the second membrane unit 2 at least partially covers the first membrane unit 1 in a vertically downward projection.

Specifically, the second membrane unit 2 covers a partial area of the first membrane unit 1 along a vertically downward projection; alternatively, the second membrane unit 2 completely covers the first membrane unit 1 in a vertically downward projection.

The first film unit 1 including the first 1/4 wave plate 1a and the first linear polarizer 1b naturally attenuates the brightness of the non-reflected noise light ④ emitted directly downward from the light emitting unit.

However, in order not to attenuate the brightness of the object signal light ② reflected back by the finger while attenuating the brightness of the non-reflected noise light ④ emitted directly downward from the light emitting unit, the angles between the optical axes of the wave plates and the polarization directions of the polarizers included in the first and second film units 1 and 2, respectively, should have special requirements.

Specifically, the optical axis of the first 1/4 wave plate 1a and the polarization direction of the first linear polarizer 1b form a first angle α, the optical axis of the second 1/4 wave plate 2a and the polarization direction of the second linear polarizer 2b form a second angle β, the numerical values (i.e., absolute values) of the first angle α and the second angle β are both around 45 °, and specifically, the difference between the numerical values of the first angle α and the second angle β may also be within a tolerance range.

Specifically, the value of the first angle α is 45 ° ± 5 °, the value of the second angle β is also 45 ° ± 5 °, the difference between the values of the first angle α and the second angle β is within the tolerance range of 0 ° to 10 °, for example, the value of the first angle α is 45 °, the value of the second angle β is 43 °, or the value of the first angle α is 42 °, and the value of the second angle β is 50 °, which still meets the practical requirements.

In addition, the direction of the first angle α is opposite to the direction of the second angle β in the viewing direction (from top to bottom) in which the second diaphragm unit 2 points to the first diaphragm unit 1. specifically, one of the first angle α and the second angle β is +45 ° ± 5 °, and the other is-45 ° ± 5 ° in the above-mentioned viewing direction from top to bottom.

For example, as shown in fig. 8A and 8B, first angle α is +45 ° ± 5 °, and second angle β is-45 ° ± 5 °, or, as shown in fig. 9A and 9B, first angle α is-45 ° ± 5 °, and second angle β is +45 ° ± 5 °.

Of course, the viewing direction is not limited to the top-to-bottom direction along the second film unit 2 toward the first film unit 1, but may be the opposite direction. I.e. from bottom to top, pointing along the first membrane unit 1 towards the second membrane unit 2.

The direction of the first angle α and the direction of the second angle β in a bottom-to-top direction pointing along the first diaphragm unit 1 toward the second diaphragm unit 2 are opposite to the above case.

Since the principle of the first film unit 1 including the first 1/4 wave plate 1a and the first linear polarizer 1b for attenuating the brightness of the non-reflected noise light ④ directly emitted downward by the light emitting unit has been explained above, and is not described herein in detail, the following describes the principle of not attenuating or slightly attenuating the brightness of the target signal light ② reflected back by the finger while attenuating the brightness of the non-reflected noise light ④ by the scheme design that the first angle α is opposite to the second angle β and the values are equal or similar.

As shown in fig. 1 to 7, light ① emitted from the light emitting unit of the substrate 3 and directed to the second film element 2 is reflected by the finger pressing the cover 5 and returns through the second film element 2, and becomes target signal light ② of circular polarization or elliptical polarization.

The target signal light ② propagates through the substrate 3, and after reaching the first 1/4 wave plate 1a of the first film unit 1, it becomes a linearly polarized light ③ with the same polarization direction as the first linear polarizer 1b, and can be incident to the light sensing element 4 through the first linear polarizer 1b without loss or with low loss to form an image.

The embodiment of the utility model provides an identification subassembly for optical fingerprint under screen, through set up the first diaphragm unit 1 that includes first 1/4 wave plate 1a and first linear polarizer 1b between base plate 3 and light sense element 4, then by base plate 3 directly to the non-reflection noise light ④ that light sense element 4 sent, through first 1/4 wave plate 1a and first linear polarizer 1b after, luminance can attenuate to, thereby, can reduce non-reflection noise light ④'s luminance, imaging quality can promote.

In addition, the second diaphragm unit 2 comprising the second 1/4 wave plate 2a and the second linear polarizer 2b is configured, and the direction and the difference of the first angle α between the first 1/4 wave plate 1a and the first linear polarizer 1b and the second angle β between the second 1/4 wave plate 2a and the second linear polarizer 2b are designed to be adaptive, so that the target signal light ② is not attenuated or is attenuated less while the non-reflected noise light ④ is attenuated, and thus, the signal-to-noise ratio of the light received by the light sensing element 4 is improved, and the imaging quality is greatly improved.

It should be noted that, in the description of the present invention, the terms "first", "second", and the like are used for descriptive purposes only and for distinguishing similar objects, and no order is shown between the two, and no indication or suggestion of relative importance is understood. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided would be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of the subject matter that is disclosed herein is not intended to forego such subject matter, nor should the applicants be construed as having contemplated such subject matter as being part of the disclosed subject matter.

Claims (16)

1. An identification assembly for an optical fingerprint under a screen, comprising:

a substrate provided with a light emitting unit;

the light sensing element is arranged below the substrate and at least can receive target signal light reflected by a target organism above the substrate;

the first membrane unit is arranged between the substrate and the light sensing element and comprises a first 1/4 wave plate and a first linear polarizer, and the first 1/4 wave plate is positioned between the first linear polarizer and the substrate;

a second membrane unit disposed over the substrate, the second membrane unit including a second 1/4 wave plate and a second linear polarizer, the second 1/4 wave plate being located between the second linear polarizer and the substrate;

wherein a first angle is formed between the optical axis of the first 1/4 wave plate and the polarization direction of the first linear polarizer, and a second angle is formed between the optical axis of the second 1/4 wave plate and the polarization direction of the second linear polarizer;

and, in the viewing angle direction of the second diaphragm unit pointing to the first diaphragm unit, one of the first angle and the second angle is +45 ° ± 5 °, and the other is-45 ° ± 5 °.

2. The identification assembly for an off-screen optical fingerprint of claim 1,

the first angle is +45 ° ± 5 °, and the second angle is-45 ° ± 5 °; or,

the first angle is-45 ° ± 5 °, and the second angle is +45 ° ± 5 °.

3. An identification assembly for an off-screen optical fingerprint as recited in claim 1 wherein said first diaphragm unit and said second diaphragm unit are both located in a propagation path of said target signal light.

4. An identification assembly for an underscreen optical fingerprint as claimed in claim 1 or 3 wherein said first diaphragm unit and said second diaphragm unit at least partially overlap.

5. An identification assembly for an off-screen optical fingerprint as recited in claim 1 or 3 wherein a projection of the second membrane unit towards the first membrane unit at least partially covers the first membrane unit.

6. The identification assembly for an optical fingerprint under a screen of claim 1, wherein a surface of the second film unit facing away from the substrate is provided with a cover plate, the cover plate has a light-transmitting area, and the light-transmitting area is formed with an operation area for the target organism to press.

7. The assembly according to claim 1, wherein the light-sensing element is disposed in a fingerprint module, and the first membrane unit forms a part of the fingerprint module structure.

8. An identification assembly for an optical fingerprint under a screen as recited in claim 7 wherein said fingerprint module is configured with a frame supporting said light sensing element, said first membrane unit being disposed on said frame.

9. The identification assembly for an optical fingerprint under a screen of claim 8 wherein the holder defines a receiving space in which the lens barrel is disposed; the target signal light can reach the light sensing element through the lens cone;

the first diaphragm unit is at least partially accommodated in the accommodating space; or,

the first diaphragm unit is at least partially disposed in the lens barrel.

10. The identification assembly for an off-screen optical fingerprint of claim 8,

the first diaphragm unit is supported at the end of the bracket; or,

the first linear polarizer is accommodated in an accommodating space defined by the bracket, and the first 1/4 wave plate is supported at the end of the bracket.

11. The identification assembly for an optical fingerprint under a screen of claim 9 wherein a plurality of optical lenses are further disposed between said light-sensing element and said substrate.

12. The identification assembly for an off-screen optical fingerprint of claim 11,

the first membrane unit is positioned above all the optical lenses; or,

the first diaphragm unit is positioned below all the optical lenses; or,

the first membrane unit is positioned between any two adjacent optical lenses; or;

one or more optical lenses are arranged between the first 1/4 wave plate and the first linear polarizer in a spaced mode.

13. The identification assembly for an off-screen optical fingerprint of claim 11,

a plurality of optical lenses are arranged in the accommodating space; or,

a plurality of the optical lenses are disposed in the lens barrel.

14. The identification assembly for an optical fingerprint under a screen of claim 9, wherein an optical filter is further disposed between the substrate and the light-sensing element, and the optical filter is used for at least partially filtering noise light in the target signal light.

15. The identification assembly for an off-screen optical fingerprint of claim 14,

the optical filter is positioned above the first membrane unit; or,

the optical filter is positioned between the first 1/4 wave plate and the first linear polarizer; or,

the optical filter is positioned between the first membrane unit and the light sensing element.

16. The identification assembly for an off-screen optical fingerprint of claim 14,

the optical filter is arranged in the accommodating space; or,

the optical filter is disposed in the lens barrel.