CN111353480A - Micro-lens assembly, preparation method, optical fingerprint module and electronic device - Google Patents
Micro-lens assembly, preparation method, optical fingerprint module and electronic device Download PDFInfo
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- CN111353480A CN111353480A CN202010340327.9A CN202010340327A CN111353480A CN 111353480 A CN111353480 A CN 111353480A CN 202010340327 A CN202010340327 A CN 202010340327A CN 111353480 A CN111353480 A CN 111353480A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0012—Arrays characterised by the manufacturing method
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
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Abstract
The invention relates to a micro-lens assembly, a preparation method, an optical fingerprint module and an electronic device. A microlens assembly, comprising: a transparent substrate; the imprinting substrate is arranged on the transparent substrate; the micro-lens array comprises a plurality of micro-lenses which are arranged on the surface of the imprinting substrate, far away from the transparent substrate and are arranged in an array; a space is arranged between the adjacent micro lenses; and a light shielding layer completely covering a portion of the imprint substrate not covered by the microlenses and partially covering the microlenses; the light shielding layer is provided with a plurality of hollow structures which correspond to the micro lenses one by one; in the direction vertical to the working surface, the central axis of the hollow structure is collinear with the central axis of the corresponding micro lens; in the direction perpendicular to the working surface, the projection of the hollow structure on the micro lens is totally arranged on the micro lens and is spaced from the edge of the micro lens. The micro-lens assembly avoids the reduction of the strength of the transparent substrate caused by the arrangement of the groove, and does not influence the layout of elements such as diodes on the transparent substrate.
Description
Technical Field
The invention relates to the field of microlenses, in particular to a microlens assembly, a preparation method, an optical fingerprint module and an electronic device.
Background
The micro lens array refers to a plurality of micro/nano lens groups which are arranged in an array shape. The lens has the basic functions of focusing, imaging and the like of the traditional lens, and has the characteristics of small unit size and high integration level, so that the lens can complete the functions which cannot be completed by the traditional optical element and can form a plurality of novel optical systems. Generally, in order to avoid the light with a large inclination angle from entering the microlens and then passing through the imprint substrate to form an image, a groove is often formed in the transparent substrate, and a light-shielding material is disposed in the groove to shield the light with a large inclination angle. However, this method requires changing the structure of the transparent substrate, which results in the decrease of the strength of the transparent substrate and may affect the layout of the elements such as diodes on the transparent substrate.
Disclosure of Invention
Accordingly, there is a need for a microlens assembly that can block light with a large inclination angle from entering a microlens without changing a mechanism of a transparent substrate.
A microlens assembly, comprising:
a transparent substrate having a working surface;
the imprinting substrate is arranged on the working surface of the transparent substrate;
the micro-lens array comprises a plurality of micro-lenses which are arranged on the surface of the imprinting substrate, far away from the transparent substrate and are arranged in an array; a space is arranged between the adjacent micro lenses; and
a light shielding layer completely covering a portion of the imprint substrate not covered by the microlenses and partially covering the microlenses; the light shielding layer is provided with a plurality of hollow structures which correspond to the micro lenses one by one; in the direction perpendicular to the working surface, the central axis of the hollowed-out structure is collinear with the central axis of the corresponding micro lens; in the direction perpendicular to the working surface, the projection of the hollow structure on the micro lens is totally arranged on the micro lens, and a gap is reserved between the hollow structure and the edge of the micro lens.
In the micro lens assembly, the shading layer covers the edge of the micro lens and directly blocks light with larger inclination angle from entering the micro lens. In addition, the light shielding layer is positioned on one side of the imprinting base, which is far away from the transparent substrate, so that the light with a larger inclination angle can be blocked without changing the structure of the transparent substrate, the reduction of the strength of the transparent substrate caused by the arrangement of the grooves is avoided, and the layout of elements such as diodes on the transparent substrate is not influenced.
In one embodiment, along the direction parallel to the working surface, the distance between the projection of the hollow structure on the imprinting substrate and the edge of the corresponding micro lens is less than or equal to 2.5 μm. Therefore, on one hand, the light with larger inclination angle entering the edge of the micro lens can be shielded; on the other hand, the phenomenon that the imaging effect is influenced by too little light passing through the micro lens due to more coverage of the micro lens is avoided.
In one embodiment, the surface of the light shielding layer far away from the imprinting substrate is provided with a bulge; the bulges are encircled into a plurality of recesses which are in one-to-one correspondence with the micro lenses; the micro lens is positioned in the recess and is spaced from the protrusion; in the direction perpendicular to the working surface, the height of the projection is higher than that of the micro lens by taking the working surface as a reference. Thus, light entering the edge of the microlens at a large inclination angle can be further blocked.
In one embodiment, the height difference between the bump and the microlens is 5 μm-10 μm in a direction perpendicular to the working surface with reference to the working surface. Outside the light that shines into the microlens so that the optics fingerprint module has better formation of image effect in the slope of sheltering from that can be better, can also avoid the thickness of the more increase microlens subassembly because of bellied height h1 is too high.
In one embodiment, the distance between the side surface of the protrusion and the central axis of the corresponding microlens in the direction along the working surface is gradually increased. Thereby when the hollow out construction of formation light shield layer, the drawing of patterns of the mould of being convenient for.
In one embodiment, the side edge of any section of the protrusion, which is parallel to the direction perpendicular to the working surface, is a straight line; the included angle formed by the side surface of the protrusion and the working surface is more than or equal to 115 degrees. Thereby making it easier to demold the mold.
In one embodiment, the distance between the projection of the protrusions on the stamping substrate and the projection of the microlenses on the stamping substrate is ≦ 12 μm. Therefore, under the condition of facilitating the demolding of the mold, the distance between the bulge and the micro lens is smaller, and more light obliquely irradiating to the micro lens can be shielded.
The invention also provides an optical fingerprint module which comprises the micro-lens component.
Above-mentioned optical fingerprint module, the light shield layer covers the edge of microlens, directly blocks the great light of inclination and penetrates the microlens. In addition, the light shielding layer is positioned on one side of the imprinting base, which is far away from the transparent substrate, so that the light with a larger inclination angle can be blocked without changing the structure of the transparent substrate, the reduction of the strength of the transparent substrate caused by the arrangement of the grooves is avoided, and the layout of elements such as diodes on the transparent substrate is not influenced.
The invention also provides an electronic device which comprises the optical fingerprint module provided by the invention.
In the electronic device, the light shielding layer covers the edge of the micro lens and directly blocks light with a larger inclination angle from entering the micro lens. In addition, the light shielding layer is positioned on one side of the imprinting base, which is far away from the transparent substrate, so that the light with a larger inclination angle can be blocked without changing the structure of the transparent substrate, the reduction of the strength of the transparent substrate caused by the arrangement of the grooves is avoided, and the layout of elements such as diodes on the transparent substrate is not influenced.
The invention also provides a preparation method of the micro-lens component, which comprises the following steps:
providing a transparent substrate;
forming the stamping substrate and the micro-lens array on the working surface of the transparent substrate in a stamping mode;
and forming the light shielding layer.
According to the micro-lens component formed by the preparation method, the shading layer covers the edge of the micro-lens and directly blocks light with a larger inclination angle from entering the micro-lens. In addition, the light shielding layer is positioned on one side of the imprinting base, which is far away from the transparent substrate, so that the light with a larger inclination angle can be blocked without changing the structure of the transparent substrate, the reduction of the strength of the transparent substrate caused by the arrangement of the grooves is avoided, and the layout of elements such as diodes on the transparent substrate is not influenced.
In one embodiment, the step of forming the light shielding layer comprises the following operations:
forming a light shielding layer primary body covering the impressing substrate and the micro lens array in a spin coating or spraying mode;
and forming the hollow structure on the light shielding layer primary body to form the light shielding layer.
Drawings
Fig. 1 is a top view of a microlens assembly according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of the microlens assembly of fig. 1 taken along the direction of M-M.
Fig. 3 is a flowchart of a method for manufacturing a microlens assembly according to an embodiment of the present invention.
Fig. 4 is a flowchart illustrating the operation of step S02 shown in fig. 3.
Fig. 5a is a cross-sectional view of the transparent substrate provided in step S01.
Fig. 5b is a cross-sectional view after forming the imprint substrate and the microlens array on the transparent substrate in step S02.
Fig. 5c1 is a cross-sectional view of the embossed substrate and the light-shielding layer precursor formed on the microlens array after step S03 a.
Fig. 5c2 is a cross-sectional view of the embossed substrate and the light-shielding layer precursor formed on the microlens array after step S03 b.
100. A micro-lens assembly; 110. a transparent substrate; 111. a working surface; 120. an optical filter; 130. imprinting a substrate; 150. a microlens; 170. a light-shielding layer; 171. a hollow structure; 173. a protrusion; 175. recessing; 170a, and a light-shielding layer precursor.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
It will be understood that when an element is referred to as being "on" or "over" 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.
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.
As shown in fig. 1 to fig. 2, a microlens 150 assembly 100 according to an embodiment of the present invention includes a transparent substrate 110, an imprinting substrate 130, a microlens array, and a light-shielding layer 170.
The transparent substrate 110 has a working surface 111. The imprinting substrate 130 is disposed on the working surface 111 of the transparent substrate 110. The microlens array includes a plurality of microlenses 150 arranged in an array on the surface of the imprinting substrate 130 away from the transparent substrate 110. There is a space between adjacent microlenses 150. The light shielding layer 170 completely covers the portion of the imprinting substrate 130 not covered by the microlenses 150, and partially covers the microlenses 150. The light-shielding layer 170 has a plurality of hollow structures 171 corresponding to the microlenses 150 one by one. In a direction perpendicular to the working surface 111, a central axis of the hollow structure 171 is collinear with a central axis of the corresponding microlens 150, as indicated by a dotted line m in fig. 1. In the direction perpendicular to the working surface 111, the projection of the hollow structure 171 on the microlens 150 falls on the microlens 150, and is spaced from the edge of the microlens 150.
In other words, the portion of the microlens 150 covered by the light shielding layer 170 is the edge portion of the microlens 150. The hollow structure 171 is disposed such that a portion of the microlens 150 near the central region is exposed, thereby allowing incident light to enter through the exposed portion of the microlens 150.
In the microlens 150 assembly 100, the light shielding layer 170 covers the edge of the microlens 150, and directly blocks light with a large inclination angle from entering the microlens 150. In addition, the light shielding layer 170 is located on the side of the imprinting base 130 away from the transparent substrate 110, so that light with a large inclination angle can be blocked without changing the structure of the transparent substrate 110, that is, the decrease of the intensity of the transparent substrate 110 due to the arrangement of the groove is avoided, and the layout of elements such as diodes on the transparent substrate 110 is not affected.
It is understood that, in the present embodiment, the microlens array is formed by imprinting together with the imprinting substrate 130. The light-shielding layer 170 covers the portion of the imprinting substrate 130 not covered by the microlenses 150 and the edges of the microlenses 150, so the light-shielding layer 170 is formed after the imprinting substrate 130 and the microlens array are formed, so that the light-shielding layer 170 may cover the edges of the microlenses 150. Of course, in another possible embodiment, the microlens array may also be formed by stamping the substrate, so as to ensure that the light shielding layer 170 is formed after the stamping substrate 130 and the microlens array are formed.
Compared with the traditional mode of arranging the groove on the transparent substrate and filling the light shielding material in the groove, the method has the advantages that the light shielding layer 170 is directly formed on the surfaces of the imprinting substrate 130 and the micro lens 150, the grooving process is not needed, and therefore the preparation method is simpler. In addition, the microlens 150 assembly 100 is formed without a grooving process, thereby preventing damage to elements such as diodes in the transparent substrate 110.
The light-shielding layer 170 covers the edges of the microlenses 150, thereby preventing light from entering between the microlenses 150 and the light-shielding layer 170 due to a gap between the light-shielding layer 170 and the microlenses 150.
The light shielding layer 170 can shield the light with a larger inclination angle from entering the edge of the microlens 150, thereby reducing the amount of light entering one microlens 150 and entering the adjacent microlens 150, and effectively avoiding crosstalk phenomenon of the image formed by the adjacent microlens 150.
In this embodiment, the hollow structure 171 is the same as the structure of the microlens 150, so that the light with a larger inclination angle incident on the periphery of the microlens 150 is more uniformly shielded by the light shielding layer 170, that is, the phenomenon that the light with a larger inclination angle incident on one edge of the microlens 150 is shielded, and the light with a larger inclination angle incident on the other edge is not shielded is avoided.
In this embodiment, the microlenses 150 have the same size and shape, and the hollow structures 171 have the same size and shape, so as to maintain the consistency of the sharpness of the image formed by each microlens. Of course, in other possible embodiments, the sizes and shapes of the microlenses may be different, and the sizes and shapes of the hollow structures may also be different.
In the present application, the microlens 150 is a spherical microlens 150. Accordingly, the cutout 171 is circular. It is understood that in other possible embodiments, the microlens 150 is not limited to a spherical microlens 150, but may be an ellipsoidal microlens 150 or a polygonal microlens 150, etc. Accordingly, the shape of the hollow structure 171 can be adjusted according to the shape of the microlens 150 and the imaging requirements.
Optionally, the light shielding layer 170 may be a black glue light shielding layer. Alternatively, the light-shielding layer 170 may be a titanium layer, a chromium layer, a silicon dioxide layer, or a silicon carbide layer. The black glue shading layer, the titanium layer, the chromium layer, the silicon dioxide layer and the silicon carbide layer are all black shading layers with good light absorption. Of course, it is understood that in other implementations, the light shielding layer 170 is not limited to a black glue light shielding layer, but may be formed of other black materials that can block light and can be formed on the imprint substrate 130 without affecting other properties of the microlens 150 assembly 100.
In this embodiment, a plurality of photodiodes are disposed in the transparent substrate 110, and one microlens 150 corresponds to the plurality of photodiodes. A microlens assembly that only performs photoelectric laser compared to one microlens; in the present embodiment, the radius of the microlens 150 is larger in the direction along the working surface 111. Alternatively, the diameter of the microlenses 150 is 80 μm to 150 μm, and the height of the microlenses 150 is 10 μm to 30 μm. Accordingly, the size of the hollow structure 171 in this direction is also large. The requirement for the alignment precision between the hollow structure 171 and the microlens 150 is low.
Of course, it is understood that the number of photodiodes per microlens 150 may be adjusted in other possible embodiments. Accordingly, the radius and height of the microlens 150 are not limited thereto.
Of course, in another possible embodiment, one microlens 150 may correspond to only one photodiode.
In this embodiment, the microlens 150 assembly 100 further includes two filters 120 respectively disposed on two opposite surfaces of the transparent substrate. That is, one filter 120 is located between the transparent substrate and the imprint substrate 130, and the other filter 120 is located on the surface of the transparent substrate away from the imprint substrate 130. Of course, in another possible embodiment, the arrangement of the filter 120 is not limited thereto, and may be arranged according to a conventional method in the art.
Optionally, the distance d1 between the projection of the hollow-out structure 171 on the imprinting substrate 130 and the edge of the corresponding microlens 150 along the direction parallel to the working surface 111 is less than or equal to 2.5 μm. Therefore, on one hand, the light with larger inclination angle entering the edge of the micro lens 150 can be shielded; on the other hand, it is avoided that the imaging effect is affected by too little light passing through the micro lens 150 due to the fact that the micro lens 150 is covered more.
In particular, the spacing d1 between the projection of the cutout 171 on the imprint substrate 130 and the edge of the corresponding microlens 150 may be 2.5 μm, 2.4 μm, 2.3 μm, 2.2 μm, 2.1 μm, 2 μm, 1.8 μm, 1.6 μm, 1.5 μm, 1.3 μm, 1.2 μm, 1.1 μm, or 1 μm. Of course, it is understood that the distance d1 between the projection of the hollow structure 171 on the stamping substrate 130 and the edge of the corresponding microlens 150 is not limited thereto, and may be any value less than or equal to 2.5 μm.
In this embodiment, the surface of the light-shielding layer 170 away from the imprinting substrate 130 is provided with protrusions 173. The protrusions 173 enclose a plurality of recesses 175 corresponding to the microlenses 150 one to one. The microlenses 150 are located in the recesses 175 and spaced apart from the protrusions 173. The protrusions 173 are also disposed to block light having a large inclination angle from being incident on the microlenses 150. Further, in the direction perpendicular to the work surface 111, the height h1 of the protrusion 173 is higher than the height h2 of the microlens 150 with respect to the work surface 111. Thereby reducing the minimum tilt angle that can block light entering the microlens 150.
Of course, it is understood that in other possible embodiments, the height of the protrusion is not limited to be higher than the height of the microlens, and the height of the protrusion may be equal to or less than the height of the microlens.
Further, since the microlens 150 and the protrusion 173 are spaced apart from each other, a mold releasing step can be performed when the light shielding layer 170 is formed.
Alternatively, the difference in height between the protrusions 173 and the microlenses 150 is 5 μm to 10 μm in a direction perpendicular to the working surface 111, with the working surface 111 as a reference. Besides better blocking the light obliquely entering the micro lens 150 to make the optical fingerprint module have better imaging effect, the thickness of the micro lens 150 assembly 100 can be prevented from being increased due to the too high height h1 of the protrusion 173.
Alternatively, the difference in height of the protrusions 173 from the microlenses 150 may be 5 μm, 5.5 μm, 6 μm, 6.5 μm, 7 μm, 7.5 μm, 8 μm, 8.5 μm, 9 μm, 9.5 μm, or 10 μm. Of course, the height difference between the protrusions 173 and the microlenses 150 is not limited thereto, and may be any value between 5 μm and 10 μm.
In this embodiment, the distance between the side surface of the protrusion 173 and the central axis of the corresponding microlens 150 along the direction of the working surface 111 is gradually increased in the direction perpendicular to the working surface 111 and pointing from the working surface 111 to the protrusion 173, so that when the hollow structure 171 of the light shielding layer 170 is formed, the mold is conveniently released.
Further, specifically, in the present embodiment, the side of any cross section of the protrusion 173 perpendicular to the working surface 111 is a straight line. It will be appreciated that in alternative embodiments, the side of the protrusion 173 in any cross-section perpendicular to the working surface 111 may also be of a regular or irregular shape such as a curve or a broken line. Similarly, the shape of the side of the protrusion 173 perpendicular to the working surface 111 may be the same or different.
Still further, optionally, the side of the protrusion 173 forms an angle a ≧ 115 ° with the transparent substrate 110, thereby making the mold more easily demolded. Specifically, the side of the protrusion 173 may form an angle a of 115 °, 120 °, 130 °, 140 °, or 150 ° with the transparent substrate 110.
Optionally, the distance d2 between the projection of the protrusion 173 on the stamping substrate 130 and the projection of the micro-lens 150 on the stamping substrate 130 is less than or equal to 12 μm, so that the protrusion 173 and the micro-lens 150 have a smaller distance therebetween to block more light obliquely incident on the micro-lens 150 under the condition of facilitating the mold release.
Alternatively, the thickness d3 of the light shielding layer 170 where no protrusion 173 is provided is 0.8 μm to 3 μm in a direction perpendicular to the surface of the position covered therewith. Since the embossed substrate 130 and the microlenses 150 covered by the light-shielding layer 170 are not planar, the light-shielding layer 170 at different positions has different thickness directions. Specifically, the thickness direction of the portion of the light-shielding layer 170 covering the microlenses 150 is a direction perpendicular to the surfaces of the microlenses 150; the thickness direction of the light-shielding layer 170 at the portion between the microlenses 150 is perpendicular to the transparent substrate 110. D3 is not less than 0.8 μm and not more than 3 μm, so that the thickness of the edge of the micro lens 150 can be prevented from being increased due to the excessive thickness of the light shielding layer 170 while more light entering the edge of the micro lens 150 can be shielded.
An embodiment of the present invention further provides an optical fingerprint module, which includes the microlens assembly provided by the present invention.
Above-mentioned optical fingerprint module, the light shield layer covers the edge of microlens, directly blocks the great light of inclination and penetrates the microlens. In addition, the light shielding layer is positioned on one side of the imprinting base, which is far away from the transparent substrate, so that the light with a larger inclination angle can be blocked without changing the structure of the transparent substrate, the reduction of the strength of the transparent substrate caused by the arrangement of the grooves is avoided, and the layout of elements such as diodes on the transparent substrate is not influenced.
An embodiment of the invention further provides an electronic device, which includes the optical fingerprint module provided by the invention.
In the electronic device, the light shielding layer covers the edge of the micro lens and directly blocks light with a larger inclination angle from entering the micro lens. In addition, the light shielding layer is positioned on one side of the imprinting base, which is far away from the transparent substrate, so that the light with a larger inclination angle can be blocked without changing the structure of the transparent substrate, the reduction of the strength of the transparent substrate caused by the arrangement of the grooves is avoided, and the layout of elements such as diodes on the transparent substrate is not influenced.
Specifically, the electronic device may be a mobile phone, a tablet computer, or the like.
As shown in fig. 3 to 5, a method for manufacturing a microlens assembly 100 according to an embodiment of the present invention includes the steps of:
s01, providing the transparent substrate 110, as shown in fig. 5 a.
S02, forming the stamping substrate 130 and the microlens array on the working surface 111 of the transparent substrate 110 by stamping, as shown in fig. 5 b.
S03, forming the light-shielding layer 170, as shown in FIG. 5c 2.
In the microlens 150 assembly 100 formed by the above-described manufacturing method, the light shielding layer 170 covers the edge of the microlens 150, and directly blocks light with a large inclination angle from entering the microlens 150. In addition, the light shielding layer 170 is located on the side of the imprinting base 130 away from the transparent substrate 110, so that light with a large inclination angle can be blocked without changing the structure of the transparent substrate 110, that is, the decrease of the intensity of the transparent substrate 110 due to the arrangement of the groove is avoided, and the layout of elements such as diodes on the transparent substrate 110 is not affected.
It is understood that, between the steps S01 and S02, a step of forming the optical filter 120 between the transparent substrate 110 and the imprint base 130 is further included. Of course, alternatively, if there is no filter 120 between the transparent substrate 110 and the imprint base 130, this step is not required.
Alternatively, referring to fig. 4, fig. 5c1, and fig. 5c2, in this embodiment, the operation of step S03 is:
s03a, forming a light-shielding layer precursor 170a covering the imprint substrate and the microlens array by spin coating or spray coating, as shown in fig. 5c 1.
S03b, forming a hollow structure 171 on the light-shielding primary body 170a to form the light-shielding layer 170, as shown in fig. 5c 2.
Specifically, the hollow structure 171 may be formed by exposure and development. Of course, the hollowed-out structure 171 can be formed in other ways.
It should be noted that, in this embodiment, the protrusion is disposed on the light-shielding layer, which results in a situation where the light-shielding layer is locally thicker. It can be formed by spin coating or spray coating several times.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. A microlens assembly, comprising:
a transparent substrate having a working surface;
the imprinting substrate is arranged on the working surface of the transparent substrate;
the micro-lens array comprises a plurality of micro-lenses which are arranged on the surface of the imprinting substrate, far away from the transparent substrate and are arranged in an array; a space is arranged between the adjacent micro lenses; and
a light shielding layer completely covering a portion of the imprint substrate not covered by the microlenses and partially covering the microlenses; the light shielding layer is provided with a plurality of hollow structures which correspond to the micro lenses one by one; in the direction vertical to the working surface, the central axis of the hollowed-out structure is collinear with the central axis of the corresponding micro lens; in the direction perpendicular to the working surface, the projection of the hollow structure on the micro lens is totally arranged on the micro lens, and a gap is reserved between the hollow structure and the edge of the micro lens.
2. The micro-lens assembly of claim 1, wherein a projection of the hollowed-out structure on the stamping substrate is spaced from an edge of the corresponding micro-lens by less than or equal to 2.5 μm in a direction parallel to the working surface.
3. A microlens assembly according to claim 1 or claim 2 wherein the surface of the light-shielding layer remote from the embossed substrate is provided with projections; the bulges are encircled into a plurality of recesses which are in one-to-one correspondence with the micro lenses; the micro lens is positioned in the recess and is spaced from the protrusion; in the direction perpendicular to the working surface, the height of the projection is higher than that of the micro lens by taking the working surface as a reference.
4. A microlens assembly according to claim 3, wherein the difference in height between the protrusions and the microlenses in a direction perpendicular to the working surface is 5 μm to 10 μm with respect to the working surface.
5. A microlens assembly as in claim 3 wherein the distance between the side surface of the protrusion and the central axis of the corresponding microlens in the direction along the working surface increases gradually, perpendicular to the working surface and pointing from the working surface in the direction of the protrusion.
6. The microlens assembly of claim 5 wherein the side of any cross section of the protrusion perpendicular to the working surface is a straight line; the included angle formed by the side surface of the protrusion and the working surface is more than or equal to 115 degrees.
7. The microlens assembly of claim 3 wherein the spacing between the projection of the protrusions on the imprinted substrate and the projection of the microlenses on the imprinted substrate is ≦ 12 μm.
8. An optical fingerprint module comprising the microlens assembly of any one of claims 1 to 7.
9. An electronic device comprising the optical fingerprint module of claim 8.
10. A method of manufacturing a microlens assembly according to any one of claims 1 to 7, comprising the steps of:
providing a transparent substrate;
forming the stamping substrate and the micro-lens array on the working surface of the transparent substrate in a stamping mode;
and forming the light shielding layer.
11. A method of manufacturing a microlens assembly according to claim 10, wherein the step of forming the light-shielding layer operates by:
forming a light shielding layer primary body covering the impressing substrate and the micro lens array in a spin coating or spraying mode;
and forming the hollow structure on the light shielding layer primary body to form the light shielding layer.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113219562A (en) * | 2021-04-30 | 2021-08-06 | 京东方科技集团股份有限公司 | Optical module, manufacturing method thereof and display device |
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