CN112163482A - Optical collimator, fingerprint identification module and electronic equipment - Google Patents
Optical collimator, fingerprint identification module and electronic equipment Download PDFInfo
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- CN112163482A CN112163482A CN202010974003.0A CN202010974003A CN112163482A CN 112163482 A CN112163482 A CN 112163482A CN 202010974003 A CN202010974003 A CN 202010974003A CN 112163482 A CN112163482 A CN 112163482A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/30—Collimators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
- H04M1/026—Details of the structure or mounting of specific components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
- H04M1/667—Preventing unauthorised calls from a telephone set
- H04M1/67—Preventing unauthorised calls from a telephone set by electronic means
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Abstract
The invention provides an optical collimator, a fingerprint identification module and electronic equipment. Optical collimator is applied to the fingerprint identification module, optical collimator includes: the light guide bodies are arranged at intervals and used for collimating light rays reaching the light guide bodies; on a radial plane, the refractive index of the light guide body is gradually increased from the edge to the center; and a light shielding part disposed between the light guide bodies. The optical collimator does not include a collimating aperture and thus has a high intensity.
Description
Technical Field
The invention belongs to the field of image capture, relates to a collimator, and particularly relates to an optical collimator, a fingerprint identification module and electronic equipment.
Background
Terminal products such as smart phones tend to be attractive and intelligent, and traditional entity key or fingerprint identification tends to disappear. Therefore, the technology of the fingerprint under the optical screen is developed, and powerful technical support is provided for the aesthetic appearance and the intellectualization of the terminal product.
The fingerprint technique needs to rely on the fingerprint identification module to realize under the screen on the hardware. Wherein, optical collimator filters multiple optical noise as the important component part of fingerprint identification module, mainly through optics principle or other physical principle to acquire the fingerprint optical signal of relative pureness. Thus, the efficiency and quality of the optical collimator determines the quality and efficiency of the entire optical underscreen fingerprint recognition. The inventor finds in practical application that most of the collimators used for collimating and collecting light by using the finger print under the screen are based on the structure of collimating holes, that is: the optical noise is filtered by processing a large number of micropores on the substrate, so that the light is collimated; however, such a structure based on the collimating holes has low strength, and the collimating holes are easily clogged with dust, particles, and the like.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide an optical collimator, a fingerprint recognition module and an electronic device, which are used to solve the problems that the strength of the existing optical collimator based on the collimating holes is low and the collimating holes are easily blocked by dust, particles and other substances.
To achieve the above and other related objects, a first aspect of the present invention provides an optical collimator; optical collimator is applied to the fingerprint identification module, optical collimator includes: the light guide bodies are arranged at intervals and used for collimating light rays reaching the light guide bodies; on a radial plane, the refractive index of the light guide body is gradually increased from the edge to the center; and a light shielding part disposed between the light guide bodies.
In an embodiment of the first aspect, for any point of the light guide, the refractive index is n (r) ═ n0×(1-A×r22); wherein r represents a distance from the center of the light guide, n (r) represents a refractive index of the point, and n0The refractive index at the center of the light guide is shown, and A is a gradient index.
In an embodiment of the first aspect, the light guide includes a micro lens and a light guide body; wherein the micro lens is positioned at the incident end or two ends of the light guide main body.
In an embodiment of the first aspect, the micro lens and the light guide body are an integral structure; the integrated structure is obtained by processing the incident end or the two ends of the light guide body.
A second aspect of the invention provides another optical collimator; optical collimator is applied to the fingerprint identification module, optical collimator includes: the light guide bodies are arranged at intervals and used for collimating light rays reaching the light guide bodies; the light guide body comprises a micro lens and a light guide main body; wherein the micro lens is positioned at the incident end or two ends of the light guide main body; the micro lens and the light guide main body are of an integral structure; the integrated structure is obtained by processing the incident end or two ends of the light guide body; and a light shielding part disposed between the light guide bodies.
In an embodiment of the second aspect, the refractive index of the light guide body is a fixed value in the radial plane.
The third aspect of the present invention provides a fingerprint identification module, which includes: a substrate having a first side and a second side opposite the first side; the first side of the substrate is used for placing finger fingerprints; the light emitting layer is arranged on the second side of the substrate and used for emitting first light penetrating through the substrate; the first light is reflected by finger fingerprints to form second light penetrating through the substrate and the light-emitting layer; the optical collimator of the first aspect or the second aspect is disposed on a side of the light emitting layer away from the substrate, and is configured to collimate the second light and form a third light; and the image sensor is arranged on one side of the optical collimator, which is far away from the luminous layer, and is used for acquiring a fingerprint image of a user according to the third light.
In an embodiment of the third aspect, the light emitting layer is an OLED screen.
In an embodiment of the third aspect, the image sensor is a charge coupled device sensor, a complementary metal oxide semiconductor sensor, or a quantum thin film photosensor.
A fourth aspect of the present invention provides an electronic device, including the fingerprint identification module of the third aspect.
As described above, the technical solution of the optical collimator, the fingerprint identification module and the electronic device of the present invention has the following advantages: the optical collimator consists of a plurality of light guide bodies and light shielding parts which are arranged at intervals, so that no pore exists in the optical collimator, the strength is high, and the problem that collimating holes are blocked by substances such as dust and particles does not exist.
Drawings
FIG. 1A is a front view of an optical collimator according to an embodiment of the present invention.
FIG. 1B is a top view of an optical collimator according to an embodiment of the present invention.
Fig. 2A is a schematic structural diagram of an optical collimator according to an embodiment of the invention.
Fig. 2B is a schematic structural diagram of an optical collimator according to an embodiment of the invention.
FIG. 2C shows the refractive index profile of an optical collimator according to an embodiment of the present invention.
Fig. 3A is a schematic structural diagram of an optical collimator according to an embodiment of the invention.
Fig. 3B is a schematic structural diagram of an optical collimator according to an embodiment of the invention.
Fig. 3C is a schematic structural diagram of a light guide in an embodiment of the optical collimator according to the present invention.
Fig. 3D is a schematic structural diagram of a light guide in an embodiment of the optical collimator according to the present invention.
Fig. 4A is a schematic structural diagram of an optical collimator according to an embodiment of the invention.
Fig. 4B is a schematic structural diagram of an optical collimator according to an embodiment of the invention.
Fig. 5A is a schematic structural diagram of a fingerprint identification module according to an embodiment of the invention.
Fig. 5B is a schematic structural diagram of the fingerprint identification module according to an embodiment of the invention.
Description of the element reference numerals
1 optical collimator
11 light guide
12 light-shielding part
2 optical collimator
21 light guide body
211 micro lens
212 light guiding body
3 optical collimator
31 light guide
311 micro lens
312 light guiding body
32 light shielding part
7 fingerprint identification module
71 substrate
72 light-emitting layer
73 optical collimator
731 light guide body
732 light shielding part
74 image sensor
81 first light
82 second light ray
83 third light ray
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention. Moreover, in this document, relational terms such as "first," "second," and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
At present, an optical collimator is generally used for collimating received optical fingerprint signals by a fingerprint module under a screen, and most of the optical collimators are based on a structure of a collimating hole, namely: the optical noise is filtered by processing a large number of micropores on the substrate, so that the light is collimated; the structure based on the collimating holes has low strength, and the collimating holes are easily blocked by dust, particles and other substances. Aiming at the problem, the invention provides an optical collimator, a fingerprint identification module and electronic equipment, wherein the optical collimator is composed of a plurality of light guide bodies and light shielding parts which are arranged at intervals, so that no pore exists in the optical collimator, the strength is high, and the problem that a collimating hole is blocked by substances such as dust and particles does not exist.
Referring to fig. 1A and fig. 1B, in an embodiment of the invention, the optical collimator 1 is applied to a fingerprint identification module, and the optical collimator 1 includes a plurality of light guide bodies 11 arranged at intervals and a light shielding portion 12.
The light guide 11 is used for collimating light reaching the light guide. The light guide 11 may be made of glass, resin, or the like. Compared with the scheme adopting the collimating holes, the light guide body 11 is a light-transmitting entity, so that the strength of the optical collimator 1 can be increased, and the optical collimator 1 has better pressure resistance; further, the light guide 11 is not blocked by dust, particles, and the like, and thus there is no problem in that the collimating holes are blocked in the related art. The cross-sectional shape of the light guide 11 may be circular, triangular, rectangular, hexagonal, etc. according to specific requirements.
The light shielding portion 12 is disposed between the light guide members 11 and is closely attached to the light guide members 11. Preferably, the light shielding portion 12 is disposed between the light guide bodies 11 in a filling manner, that is: the light shielding portion 12 is filled between any two light guide bodies 11. The filling type arrangement is only for explaining that the light shielding portion 12 is filled between the light guide bodies 11, and is not limited to the way in which the light shielding portion 12 is filled to be processed or assembled. The light shielding portion 12 is preferably made of a material having a high light absorbing ability, so that light reaching the light shielding portion 12 can be absorbed by the light shielding portion 12.
As can be seen from the above description, the optical collimator according to the present embodiment is composed of a plurality of light guiding bodies and light shielding portions arranged at intervals, so that there are no voids in the optical collimator, the strength is high, and there is no problem that the collimating holes are blocked by dust, particles, and other substances.
In addition, if the light guide body 11 adopts a fixed refractive index, the light receiving angle of the optical collimator 1 is increased, and the fingerprint imaging quality is reduced; wherein the light collection angle refers to the maximum angle of the light rays allowed to pass through by the optical collimator 1. Based on this, in order to improve the collimation effect of the optical collimator 1 and reduce the light-receiving angle as much as possible, the refractive index of the light guide 11 in this embodiment gradually increases from the edge to the center on the radial plane. The light guide body 11 is a cylinder, and the radial plane is a plane parallel to the cross section of the light guide body 11. The gradual increase of the refractive index of the light guide 11 from the edge to the center means that: the light guide 11 has the lowest refractive index at the edge and the highest refractive index at the center, and the refractive index gradually and regularly increases from the edge to the center.
Referring to fig. 2A and 2B, there are shown light path diagrams of the light guide 11 and the light rays 1, 2 and 3 in the light guide 11 according to the present embodiment. Because the refractive index of the light guide body 11 gradually increases from the edge to the center, the light path of the light in the light guide body 11 is a relatively smooth curve, which is beneficial to increasing the ratio of the radial displacement and the axial displacement of the light after passing through the light guide body 11, and further improving the collimation capability of the light guide body 11.
Specifically, the light ray 1 incident from the edge a point of the light guide 11 reaches the point B0 after passing through the light guide 11; if the light guide 11 is replaced with a collimating hole, the light ray 1 reaches point B1 after entering from point a and passing through the collimating hole. Thus, the presence of the light-guiding body 11 increases the ratio of the radial displacement (2r0) to the longitudinal displacement (h) generated by the light ray 1 when it is transmitted in the optical collimator.
The light ray 3 entering from the point a of the edge of the light guide 11 reaches the point B3 after passing through the light guide request, and the point B3 is located on the side wall of the light guide 11, so the light ray 3 is absorbed by the light shielding part after reaching the point B3, and therefore the light ray 3 cannot pass through the optical collimator 1. If the light guide 11 is replaced by a collimating aperture, the light ray 3 reaches point B2 after passing through the collimating aperture, and still can pass through the collimator. Therefore, the presence of the light guide 11 increases the ratio of the radial displacement to the longitudinal displacement of the light beam 3 during transmission in the optical collimator, so that the light beam 3 cannot pass through the optical collimator.
In contrast, with the solution described in this embodiment, for the light ray incident from point a, if the incident angle of the light ray is greater than that of light ray 1, the light ray cannot pass through the optical collimator 1; with a collimator based on collimating holes, if the angle of incidence of the light is between light ray 1 and light ray 3, the light rays can still pass through the collimator. Therefore, in the present embodiment, by defining the refractive index of the light guide 11 to increase gradually from the edge to the center, the ratio of the radial displacement to the axial displacement generated by the light transmitted in the light guide 11 is increased relative to the ratio of the radial displacement to the axial displacement generated by the light transmitted in the collimating hole; this prevents part of the light that can pass through the collimating holes from passing through the light guide 11, so the optical collimator of the present embodiment can filter more stray light and has a smaller light-receiving angle than the optical collimator based on the collimating holes.
Referring to fig. 2C, it shows the corresponding relationship between the refractive index and the position of the light guide 11 in an embodiment, wherein the origin O corresponds to the center of the light guide 11, and the abscissa r0 and-r 0 corresponds to the edge of the light guide 11, respectively. In this embodiment, in order to realize the gradual increase of the refractive index of the light guide body from the edge to the center, the light guide body 11 may be made of a graded-index material, such as Grin (gradient index) material.
Preferably, the refractive index of any point in the light guide 11 is related only to the distance between the point and the center of the light guide 11. Preferably, the distribution of the refractive index of the light guide 11 in any radial plane is the same, namely: in the axial direction, points at the same distance from the central axis of the light guide 11 have the same refractive index.
For the optical collimator of this embodiment, the light reaching the optical collimator has the following conditions: one is that light rays directly reach the light shielding portion, such light rays are absorbed or reflected by the light shielding portion, and such light rays cannot pass through the optical collimator. And the second light reaches one end of the light guide body, reaches the side wall of the light guide body after being transmitted by the light guide body, is absorbed by the shading part attached to the light guide body, and cannot pass through the optical collimator. And thirdly, the light reaches one end of the light guide body, reaches the other end of the light guide body after being transmitted by the light guide body, and the light can pass through the optical collimator.
In this embodiment, the refractive index of the light guide gradually increases from the edge to the center, and the ratio of the radial displacement to the longitudinal displacement of part or all of the light rays after passing through the light guide is increased, so that a part of the light rays with a large incident angle reaches the side wall of the light guide after being transmitted through the light guide, and thus the part of the light rays cannot pass through the optical collimator in this embodiment. When the collimator based on the collimating hole is adopted, the part of light can pass through the collimating hole, so that the optical collimator has a smaller light-receiving angle, can allow fewer stray light rays to pass through compared with other solutions, and thus has better collimating capability.
In an embodiment of the invention, for any point of the light guide body, the refractive index is n (r) ═ n0×(1-A×r22); wherein r represents a distance from the center of the light guide, n (r) represents a refractive index of the point, and n0The index of refraction at the center of the light guide body is expressed, and a is a gradient index coefficient, and the value of the gradient index coefficient can be set according to specific requirements, and can be any value between 0 and 200. It should be noted that the above formula is only one distribution mode of the refractive index of the light guide, and other distribution modes may be selected according to requirements in specific applications.
Referring to fig. 3A, 3B, 3C and 3D, in an embodiment of the invention, the light guide 21 includes a micro lens 211 and a light guide body 212; wherein, the micro lens 211 is located at the incident end or both ends of the light guiding body 212. The micro lens 211 may be a commonly used micro lens or fresnel lens. The light guide body 212 comprises an incident end and an emergent end, wherein the incident end refers to one end of the light guide body 212 where light reaches; the emergent end is the other end opposite to the incident end.
The micro lens 211 has the function of converging light, so that in the embodiment, the incident end or both ends of the light guide body 212 are set as the micro lens 211, which is beneficial to reducing the light receiving angle of the optical collimator 2; the optical collimator 2 of the present embodiment has better collimating capability than an optical collimator that does not include a microlens.
Preferably, the micro-lenses 211 and the light guide body 212 are an integrated structure, and the integrated structure is obtained by processing the incident end or both ends of the light guide body. Specifically, the incident end or both ends of the light guide 21 may be processed by chemical etching or other means to obtain the microlenses 211 having a specific shape.
The invention also provides another optical collimator. Referring to fig. 4A and 4B, in an embodiment of the present invention, the optical collimator 3 is applied to a fingerprint identification module, and the optical collimator 3 includes a plurality of light guide bars 31 and a light shielding portion 32 disposed at intervals.
The light guide 31 is used for collimating the light reaching the light guide 31; the light guide 31 includes microlenses 311 and a light guide body 312; wherein, the micro lens 311 is located at the incident end or both ends of the light guide body 312; the micro lens 311 and the light guide body 312 are integrated, and the integrated structure is obtained by processing the incident end or both ends of the light guide body 31. Specifically, the incident end or both ends of the light guide 31 may be processed by other means by chemical etching to obtain the microlenses 311 having a specific shape. The light guide body 312 includes an incident end and an exit end, wherein the incident end is an end where light reaches the light guide body 312; the emergent end is the other end opposite to the incident end.
The light shielding portion 32 is disposed between the light guide members 31 and is closely attached to the light guide members 31. Preferably, the light shielding portion 32 is disposed between the light guiding members 31 in a filling manner, that is: the light shielding portion 32 is filled between any two light guide bodies 31. The filling type arrangement is only for explaining that the light shielding portion 32 is filled between the light guide bodies 31, and is not limited to the way in which the light shielding portion 32 is filled for processing or assembling. The light shielding portion 32 is preferably made of a material having a high light absorbing ability, so that the light reaching the light shielding portion 32 can be absorbed by the light shielding portion 32.
As can be seen from the above description, the optical collimator 3 of the present embodiment is composed of the plurality of light guiding bodies 31 and the light shielding portions 32 arranged at intervals, so that there are no voids in the optical collimator 3, the strength is high, and there is no problem that the collimating holes are blocked by dust, particles, and other substances.
In addition, by setting the incident end or both ends of the light guide 31 to be in the shape of a micro lens, the ratio of the radial displacement to the axial displacement generated when part or all of the light rays are transmitted inside the light guide can be increased, so that a part of the light rays with a large incident angle reach the side wall of the light guide after being transmitted through the light guide, and thus the part of the light rays cannot pass through the optical collimator of the present embodiment. When the collimator based on the collimating hole is adopted, the part of light can pass through the collimating hole, so that the optical collimator 3 in the embodiment has a smaller light receiving angle, can allow less stray light to pass through compared with other schemes, is beneficial to suppressing the stray light and improving the light transmittance, and has better collimating capability.
In an embodiment of the invention, in the radial plane, the refractive index of the light guide body is a fixed value or gradually increases from the edge to the center.
Based on the description of the optical collimator, the invention also provides a fingerprint identification module. Referring to fig. 5A and 5B, in an embodiment of the present invention, the fingerprint identification module 7 includes:
a substrate 71 having a first side and a second side opposite the first side; the first side of the substrate 71 is used for placing a finger fingerprint. The substrate 71 is made of a light-transmitting material and can be used for supporting and protecting the fingerprint identification module 7. The substrate 71 is, for example, a glass cover plate of a display screen.
A light emitting layer 72 disposed on a second side of the substrate 71 for emitting a first light 81 penetrating through the substrate 71; the first light 81 is reflected by a finger fingerprint to form a second light 82 penetrating through the substrate 71 and the light-emitting layer 72. Specifically, with respect to the substrate 71, since the substrate 71 is made of a light-transmitting material, the second light 82 can directly penetrate the substrate 71; for the light emitting layer 72, the second light 82 may pass through the light emitting layer 72 through gaps between light emitting units included in the light emitting layer 72.
It should be noted that the luminescent layer 72 may emit a large amount of first light to reach the fingerprint of the user's finger, and generate a large amount of second light by reflecting at the fingerprint of the user's finger. For convenience of illustration, only one of the first light rays 81 and its corresponding second light ray 82 are shown.
Due to the fact that the surface of the finger is uneven, after different first light rays reach the finger fingerprint and are reflected, the angle and the intensity of formed second light rays are different, the fingerprint information of a user can be obtained by processing the angle and/or the intensity of the second light rays, and therefore the second light rays carry the fingerprint information of the user. However, since the second light passes through the substrate and the light-emitting layer, the second light contains many optical noises such as stray light, extraneous reflection light, etc., and the presence of such optical noises adversely affects the result of fingerprint imaging.
The optical collimator 73 of the present invention is disposed on a side of the light emitting layer 72 away from the substrate 71, and includes a light guide 731 and a light blocking portion 732 for collimating the second light 82 and forming a third light 83. The third light ray 83 is formed by collimating the second light ray 82, and therefore, the third light ray 83 also carries fingerprint information of a user. In addition, the second light 82 is collimated to reduce the optical noise contained in the third light 83, which is beneficial to improving the imaging quality of the fingerprint.
And the image sensor 74 is arranged on the side of the optical collimator 73 away from the luminescent layer 72 and is used for acquiring a fingerprint image of a user according to the third light ray 83. The image sensor may employ a charge coupled device sensor (CCD), a complementary metal oxide semiconductor sensor (CMOS), or a quantum thin film photosensor (QD). The sensitivity, the resolution and the imaging quality of the CCD are all superior to those of the CMOS, and the production cost of the CMOS is lower; QD is superior to CMOS and CCD in photoelectric conversion efficiency and is thinner in thickness. In practical applications, a user may select CCD, CMOS or QD as the image sensor 74 according to the requirement. It should be noted that the image sensor 74 is not limited to CCD, CMOS or QD, but any element capable of converting the third light into an electrical signal to generate a fingerprint image may implement the present invention.
Preferably, the light-emitting layer 72 is an OLED screen. By selecting an OLED screen as the light emitting layer 72, the thickness of the fingerprint identification module 7 can be reduced,
according to the above description of the optical collimator and the fingerprint identification module, the invention also provides an electronic device; the electronic equipment comprises the fingerprint identification module. The electronic device is, for example, a mobile phone, a smart home appliance, or the like.
According to the above description, the optical collimator of the present invention is composed of the plurality of light guiding bodies and the light shielding portions arranged at intervals, so that there is no void in the optical collimator, the strength is high, and there is no problem that the collimating holes are blocked by dust, particles, and the like.
In some embodiments, the refractive index of the light guide body used by the optical collimator gradually increases from the edge to the center on the radial plane, so that the optical collimator can filter more stray light rays, and the collimation capability of the optical collimator is improved.
In addition, in other embodiments, the light guide body includes a micro lens and a light guide body, and the micro lens can further reduce the light receiving angle and further improve the collimation capability of the optical collimator.
Therefore, the optical collimator can reduce collimation angle and improve image contrast under the condition of keeping a certain thickness; based on the optical collimator, the fingerprint identification module can obtain image quality with better optical performance, and is beneficial to inhibiting stray light and enhancing effective fingerprint optical signals.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. An optical collimator, characterized in that, is applied to fingerprint identification module, optical collimator includes:
the light guide bodies are arranged at intervals and used for collimating light rays reaching the light guide bodies; on a radial plane, the refractive index of the light guide body is gradually increased from the edge to the center;
and a light shielding part disposed between the light guide bodies.
2. The optical collimator of claim 1, wherein: for any point of the light guide body, the refractive index is n (r) ═ n0×(1-A×r22); wherein r represents a distance from the center of the light guide, n (r) represents a refractive index of the point, and n0The refractive index at the center of the light guide is shown, and A is a gradient index.
3. The optical collimator of claim 1, wherein: the light guide body comprises a micro lens and a light guide main body; wherein the micro lens is positioned at the incident end or two ends of the light guide main body.
4. The optical collimator of claim 3, wherein:
the micro lens and the light guide main body are of an integral structure;
the integrated structure is obtained by processing the incident end or the two ends of the light guide body.
5. An optical collimator, characterized in that, is applied to fingerprint identification module, optical collimator includes:
the light guide bodies are arranged at intervals and used for collimating light rays reaching the light guide bodies; the light guide body comprises a micro lens and a light guide main body; wherein the micro lens is positioned at the incident end or two ends of the light guide main body; the micro lens and the light guide main body are of an integral structure; the integrated structure is obtained by processing the incident end or two ends of the light guide body;
and a light shielding part disposed between the light guide bodies.
6. The optical collimator of claim 5, wherein: on the radial plane, the refractive index of the light guide body is a fixed value.
7. The utility model provides a fingerprint identification module, its characterized in that, the fingerprint identification module includes:
a substrate having a first side and a second side opposite the first side; the first side of the substrate is used for placing finger fingerprints;
the light emitting layer is arranged on the second side of the substrate and used for emitting first light penetrating through the substrate; the first light is reflected by finger fingerprints to form second light penetrating through the substrate and the light-emitting layer;
the optical collimator of any one of claims 1 to 6, disposed on a side of the light emitting layer away from the substrate, for collimating the second light and forming a third light;
and the image sensor is arranged on one side of the optical collimator, which is far away from the luminous layer, and is used for acquiring a fingerprint image of a user according to the third light.
8. The fingerprint identification module of claim 7, wherein: the light emitting layer is an OLED screen.
9. The fingerprint identification module of claim 7, wherein: the image sensor is a charge coupled device sensor, a complementary metal oxide semiconductor sensor or a quantum thin film photoelectric sensor.
10. An electronic device, characterized in that: the electronic device comprises the fingerprint identification module of any one of claims 7-9.
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| CN202010974003.0A CN112163482A (en) | 2020-09-16 | 2020-09-16 | Optical collimator, fingerprint identification module and electronic equipment |
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| CN202010974003.0A CN112163482A (en) | 2020-09-16 | 2020-09-16 | Optical collimator, fingerprint identification module and electronic equipment |
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