CN211604142U - Micro-lens component, fingerprint identification module and electronic equipment - Google Patents
Micro-lens component, fingerprint identification module and electronic equipment Download PDFInfo
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- CN211604142U CN211604142U CN202020467844.8U CN202020467844U CN211604142U CN 211604142 U CN211604142 U CN 211604142U CN 202020467844 U CN202020467844 U CN 202020467844U CN 211604142 U CN211604142 U CN 211604142U
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Abstract
The utility model relates to a little lens subassembly, fingerprint identification module and electronic equipment. A microlens assembly comprising a transparent substrate having opposing first and second surfaces; the micro-lens array comprises a plurality of micro-lenses which are arranged on the first surface of the transparent substrate and are arranged in an array; the micro lenses are polygonal micro lenses, adjacent micro lenses are arranged on the same side, and the plurality of micro lenses are integrally connected in a seamless mode; the first shading layer is arranged on the second surface of the transparent substrate; the first light shielding layer is provided with a plurality of first hollow structures which correspond to the micro lenses one by one; in the direction vertical to the first surface, the central axis of the first hollow structure is superposed with the central axis of the corresponding micro lens; the part of the first light shielding layer, which is not provided with the first hollow structure, is a first light shielding part, and the edge of the projection of the micro lens on the first light shielding layer is located on the first light shielding part of the first light shielding layer and is spaced from the first hollow structure. According to the micro-lens assembly, the light condensation efficiency can be improved through the first light shielding layer.
Description
Technical Field
The utility model relates to a microlens field especially relates to a microlens subassembly, fingerprint identification module and electronic equipment.
Background
The micro lens array refers to a plurality of micro-nano-scale lenses 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. However, the image formed by the light passing through the microlens has inconsistent definition, which affects the imaging effect.
SUMMERY OF THE UTILITY MODEL
Based on this, there is a need for a needle providing a microlens assembly that can improve imaging.
A microlens assembly, comprising:
a transparent substrate having opposing first and second surfaces;
the micro-lens array comprises a plurality of micro-lenses which are arranged on the first surface of the transparent substrate and are arranged in an array; the micro lenses are polygonal micro lenses, the adjacent micro lenses share the same edge, and the plurality of micro lenses are integrally connected in a seamless mode; and
the first shading layer is arranged on the second surface of the transparent substrate; the first light shielding layer is provided with a plurality of first hollow structures which correspond to the micro lenses one by one; in the direction perpendicular to the first surface, the central axis of the first hollow structure is superposed with the central axis of the corresponding micro lens; the part, not provided with the first hollow structure, of the first light shielding layer is a first light shielding part, and the edges of the projection of the micro lens on the first light shielding layer are all located on the first light shielding part of the first light shielding layer and are spaced from the first hollow structure.
Above-mentioned microlens subassembly can shelter from the parasitic light that the incident angle is great through first light shield layer to improve the incident light and see through the uniformity of the definition of the image that forms behind the microlens, improve microlens spotlight efficiency, improve the formation of image effect promptly.
In one embodiment, the spacing distance between two adjacent first hollow structures is greater than 3 μm. Stray light with a large incident angle can be shielded well, and a good imaging effect is obtained.
In one embodiment, the thickness of the first light shielding layer is 0.8 μm to 3 μm. Therefore, the first light shielding layer can better absorb stray light with a larger incident angle, and the phenomenon that the thickness of the micro-lens component is excessively increased due to the arrangement of the first light shielding layer is avoided.
In one embodiment, the first light shielding layer is a titanium layer, a chromium layer, a silicon dioxide layer or a silicon carbide 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.
In one embodiment, the surface of the microlens attached to the transparent substrate is a first attaching surface; the shape of the first hollow structure is the same as that of the corresponding first attaching surface, each edge of the first hollow structure is parallel to the edge of the corresponding side of the corresponding first attaching surface, and the first hollow structures are the same in size. Therefore, the light condensation efficiency of the edge of the light condensation position corresponding to each micro lens is consistent, the phenomenon that the definition of the graph formed by the micro lens assembly is high or low is avoided, and the imaging effect of the micro lens assembly is improved.
In one embodiment, the light-shielding layer further comprises a second light-shielding layer arranged on the first surface of the transparent substrate and positioned between the transparent substrate and the microlens array; the second light shielding layer is provided with a plurality of second hollow structures which correspond to the micro lenses one by one; in the direction perpendicular to the first surface, the central axis of the second hollow structure is superposed with the central axis of the corresponding micro lens; the projection of the first hollow structure on the second light shielding layer completely falls on the second hollow structure, and a gap is formed between the projection of the first hollow structure and the edge of the second hollow structure. The second light shielding layer can be arranged to shield part of stray light which is transmitted through the transparent substrate and has a large incident angle. Therefore, the consistency of the definition of an image formed after the incident light penetrates through the micro lens is further improved, the light condensation efficiency of the micro lens is improved, and the imaging effect is improved.
In one embodiment, the thickness of the second light shielding layer is 0.8 μm to 3 μm. Therefore, the second light shielding layer can better absorb stray light with a larger incident angle, and the phenomenon that the thickness of the micro-lens component is excessively increased due to the arrangement of the second light shielding layer is avoided.
In one embodiment, the second light shielding layer is a titanium layer, a chromium layer, a silicon dioxide layer or a silicon carbide 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.
In one embodiment, the surface of the microlens attached to the transparent substrate is a first attaching surface; the shape of the second hollow structure is the same as that of the corresponding first binding face, each edge of the second hollow structure is parallel to the edge of the corresponding side of the corresponding first binding face, and the second hollow structures are the same in size. Therefore, the light condensation efficiency of the edge of the light condensation position corresponding to each micro lens is consistent, the phenomenon that the definition of the graph formed by the micro lens assembly is high or low is avoided, and the imaging effect of the micro lens assembly is improved.
In one embodiment, the first surface or the second surface of the transparent substrate is provided with a plurality of protrusions which are respectively in one-to-one correspondence with the first hollow structures; in a direction perpendicular to the first surface, a central axis of the protrusion coincides with a central axis of the corresponding microlens; the edge of the projection of the protrusion on the first light shielding layer completely falls on the first light shielding part of the first light shielding layer, and is spaced from the first hollow structure; the micro-lens assembly further comprises an embedded shading structure filled in the relative concave areas formed between the protrusions. The embedded shading structure can firstly shade part of stray light with larger incidence angle which penetrates through the transparent substrate. Therefore, the consistency of the definition of an image formed after the incident light penetrates through the micro lens is further improved, the light condensation efficiency of the micro lens is improved, and the imaging effect is improved. The first shading layer and the embedded shading structure act together, so that the light condensing efficiency of the micro lens can be improved better, and the imaging effect is improved.
In one embodiment, the embedded light shielding structure is an epoxy light shielding structure. The epoxy resin shading structure has a good light absorption effect.
In one embodiment, the surface of the microlens attached to the transparent substrate is a first attaching surface; the convex shape is the same as the shape of the corresponding first binding face, each convex edge is parallel to the corresponding edge of the corresponding side of the corresponding first binding face, and the convex sizes are the same. Therefore, the light condensation efficiency of the edge of the light condensation position corresponding to each micro lens is consistent, the phenomenon that the definition of the graph formed by the micro lens assembly is high or low is avoided, and the imaging effect of the micro lens assembly is improved.
In one embodiment, the first surface or the second surface of the transparent substrate is provided with a plurality of annular grooves corresponding to the micro lenses one by one; in a direction perpendicular to the first surface, a central axis of an inner ring of the annular groove coincides with a central axis of the corresponding microlens; the projection of the inner ring of the annular groove on the first shading layer is completely arranged on the first shading part of the first shading layer, and a gap is formed between the projection of the inner ring of the annular groove and the edge of the first hollow structure; the micro-lens component also comprises a ring-column-shaped shading structure filled in the annular groove. The ring-column-shaped shading structure can firstly shade part of stray light with larger incidence angle which enters the transparent substrate. Therefore, the consistency of the definition of an image formed after the incident light penetrates through the micro lens is further improved, the light condensation efficiency of the micro lens is improved, and the imaging effect is improved. The first shading layer and the annular columnar shading structure act together, so that the light condensation efficiency of the micro lens can be improved better, and the imaging effect is improved.
In one embodiment, the ring-column-shaped light shielding structure is an epoxy resin light shielding structure. The epoxy resin shading structure has a good light absorption effect.
In one embodiment, the surface of the microlens attached to the transparent substrate is a first attaching surface; the shape of the projection of the inner ring of the annular groove on the first surface is the same as the shape of the corresponding outer ring of the first binding surface, each edge of the projection of the inner ring of the annular groove on the first surface is parallel to the corresponding edge of the corresponding side of the first binding surface, and the inner rings of the annular grooves are the same in size. Therefore, the light condensation efficiency of the edge of the light condensation position corresponding to each micro lens is consistent, the phenomenon that the definition of the graph formed by the micro lens assembly is high or low is avoided, and the imaging effect of the micro lens assembly is improved.
In one embodiment, each of the microlenses is a regular triangular microlens, a square microlens, a regular pentagonal microlens, or a regular hexagonal microlens. Simple structure and easy forming.
The utility model also provides a fingerprint identification module, it includes the utility model provides a little lens subassembly.
Above-mentioned fingerprint identification module can shelter from the great parasitic light of incident angle through first light shield layer to improve the incident light and see through the uniformity of the definition of the image that forms behind the microlens, improve microlens spotlight efficiency, improve the imaging promptly.
The utility model also provides an electronic equipment, it includes the utility model provides a fingerprint identification module.
Above-mentioned electronic equipment can shelter from the great parasitic light of incident angle through first light shield layer to improve the incident light and see through the uniformity of the definition of the image that forms behind the microlens, improve microlens spotlight efficiency, improve the formation of image effect promptly.
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 top view of the microlens assembly of fig. 1.
Fig. 4 is a cross-sectional view of a microlens assembly according to another embodiment of the present invention.
Fig. 5 is a top view of the second light-shielding layer in fig. 4.
Fig. 6 is a cross-sectional view of a microlens assembly according to another embodiment of the present invention.
Fig. 7 is a bottom view of the transparent substrate and the embedded light shielding structure in fig. 6.
Fig. 8 is a cross-sectional view of a microlens assembly according to another embodiment of the present invention.
Fig. 9 is a cross-sectional view of a microlens assembly according to another embodiment of the present invention.
Fig. 10 is a bottom view of the transparent substrate and the ring-shaped pillar light-shielding structure in fig. 9.
Fig. 11 is a cross-sectional view of a microlens assembly according to another embodiment of the present invention.
Fig. 12 is a cross-sectional view of a microlens assembly according to another embodiment of the present invention.
100/200/300/400/500/600/700, a microlens assembly; 110. a transparent substrate; 111. a first surface; 113. a second surface; 114. a relatively recessed region; 1141. a protrusion; 115. an annular groove; 130. a microlens; 131. a first binding surface; 150. a second light-shielding layer; 151. a second hollow structure; 160. an embedded shading structure; 170. a ring-column-shaped shading structure; 190. a first light-shielding layer; 191. the first hollow structure.
Detailed Description
The inventor finds out through research that: generally, incident light impinging on a microlens assembly includes normal light and non-normal light. The light intensity of vertical light after penetrating through the micro lens and the micro lens array is reduced slightly, so that the definition of the formed image is higher. And the non-vertical light is refracted when passing through the micro-lens component, so that the light intensity of the non-vertical light is weakened more after passing through the micro-lens component, and the definition of the formed image is lower. When the normal light and the non-normal light exist simultaneously, and the range of the incident angle of the non-normal light when the non-normal light is incident to the microlens or the transparent substrate is large, the consistency of the definition of an image formed after the incident light penetrates through the microlens assembly is weak, so that the condensing efficiency of the microlens is low, and the imaging effect is influenced.
Based on this, the utility model provides a micro lens subassembly, it includes:
a transparent substrate having opposing first and second surfaces;
the micro-lens array comprises a plurality of micro-lenses which are arranged on the first surface of the transparent substrate and are arranged in an array; the micro lenses are polygonal micro lenses, the adjacent micro lenses share the same edge, and the plurality of micro lenses are integrally connected in a seamless mode; and
the first shading layer is arranged on the second surface of the transparent substrate; the first light shielding layer is provided with a plurality of first hollow structures which correspond to the micro lenses one by one; in the direction perpendicular to the first surface, the central axis of the first hollow structure is superposed with the central axis of the corresponding micro lens; the part, not provided with the first hollow structure, of the first light shielding layer is a first light shielding part, and the edges of the projection of the micro lens on the first light shielding layer are all located on the first light shielding part of the first light shielding layer and are spaced from the first hollow structure.
Above-mentioned microlens subassembly can shelter from the parasitic light that the incident angle is great through first light shield layer to improve the incident light and see through the uniformity of the definition of the image that forms behind the microlens, improve microlens spotlight efficiency, improve the formation of image effect promptly.
It should be noted that the vertical light refers to light perpendicular to the incident surface of the microlens, and is not vertical light otherwise.
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
It will be understood that when an element is referred to as being "secured to" 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 3, a microlens assembly 100 according to an embodiment of the present invention includes a transparent substrate 110, a microlens 130 array, and a first light shielding layer 190.
Wherein the transparent substrate 110 has a first surface 111 and a second surface 113 opposite to each other. The microlens array 130 includes a plurality of microlenses 130 arranged in an array on the first surface 111 of the transparent substrate 110. The microlenses 130 are polygonal microlenses 130. The adjacent microlenses 130 are arranged in a common edge, and the microlenses 130 are integrally and seamlessly connected. In other words, the middle of the projection of the microlens 130 array on the transparent substrate 110 is free from hollow. The first light-shielding layer 190 is disposed on the second surface 113 of the transparent substrate 110. The first light-shielding layer 190 has a plurality of first hollow structures 191 corresponding to the microlenses 130 one by one. In a direction perpendicular to the first surface 111, a central axis of the first hollow structure 191 coincides with a central axis of the corresponding microlens 130, see a dotted line a in fig. 2. The portion of the first light-shielding layer 190 without the first hollow structure 191 is a first light-shielding portion, and the edges of the projections of the microlenses 130 on the first light-shielding layer 190 all fall on the first light-shielding portion of the first light-shielding layer 190 and are spaced from the edges of the first hollow structure 191.
In the microlens assembly 100, the first light shielding layer 190 can shield stray light with a large incident angle, so that the uniformity of the definition of an image formed after incident light penetrates through the microlens 130 is improved, the light condensing efficiency of the microlens 130 is improved, and an imaging effect is improved.
Specifically, referring to fig. 2, L1 is vertical light, and L2 and L3 are both non-vertical light. The incident angle of L2 is a, and the incident angle of L3 is b. Obviously, the size of the incident angle b is larger than that of the incident angle a, i.e., the incident angle of L3 is larger than that of L2. In other words, the closer to the edge of the microlens 130, the larger the incident angle of the incident light. Accordingly, the closer to the edge of the microlens, the greater the refractive loss of the incident light after it enters the microlens. In this embodiment, the L3 is the light with the largest incident angle that can enter the microlens 130, that is, the first light shielding layer 190 can shield stray light with an incident angle greater than b, that is, light with lower definition after incident imaging, and the definition of incident light with an incident angle less than b is greater than or equal to the definition of incident imaging of the incident light L3, so as to improve the consistency of the definition of images formed by the microlens 130, improve the light gathering efficiency of the microlens, that is, improve the molding effect.
Furthermore, in the embodiment, the first light shielding layer 190 shields the parasitic light with a large incident angle, so that the parasitic light with a large incident angle can be effectively alleviated from being refracted to the light condensing positions of other microlenses 130, and thus, the sampling between different microlenses 130 cannot generate crosstalk, thereby avoiding the parallax phenomenon of the formed image.
Specifically, in the present embodiment, two adjacent first hollow structures 191 are symmetric with respect to the adjacent edge of two corresponding adjacent microlenses 130. Therefore, the part of the first light shielding layer 190, which is located between the two adjacent first hollow structures 191, can symmetrically shield stray light with a large incident angle corresponding to the two adjacent microlenses 130, so that the light condensing efficiency of the two adjacent microlenses 130, which is close to one side of the adjacent edges, is consistent, and the phenomenon that the definition of a pattern formed by the microlens assembly 100 is suddenly high and suddenly low is avoided, namely, the imaging effect of the microlens assembly 100 is improved.
Further, in the embodiment, the widths of the portions of the first light shielding layer 190 located between any two adjacent first hollow structures 191 are the same, so that the light condensing efficiency of the corresponding focusing position of each microlens 130 is consistent, and the overall imaging effect of the microlens assembly 100 is further improved.
Optionally, referring to fig. 3, a separation distance w1 between two adjacent first hollow structures 191 is greater than 3 μm, so that stray light with a large incident angle can be shielded well, and a good imaging effect is obtained.
Optionally, the thickness of the first light shielding layer 190 is 0.8 μm to 3 μm. Therefore, the first light shielding layer 190 can better absorb stray light with a larger incident angle, and the thickness of the microlens assembly 400 is prevented from being excessively increased due to the arrangement of the first light shielding layer 190. Specifically, the thickness of the first light-shielding layer 190 may be 0.8 μm, 0.9 μm, 1.0 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm, 2.0 μm, 2.2 μm, 2.4 μm, 2.5 μm, 2.6 μm, 2.8 μm, 2.9 μm, or 3 μm.
Optionally, the first light shielding layer 190 is a titanium layer, a chromium layer, a silicon dioxide layer, or a silicon carbide 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. The first light-shielding layer 190 may be formed by evaporation or coating of photoresist.
Of course, it is understood that, in another possible embodiment, the first light shielding layer 190 is not limited to a titanium layer, a chromium layer, a silicon dioxide layer, or a silicon carbide layer, and may also be a black light shielding layer such as an epoxy resin. Similarly, the thickness of the first light-shielding layer 190 is not limited to 0.8 μm to 3 μm, and the light-shielding layer can absorb light well. In general, the light absorbed by the first light-shielding layer 190 has an optical density of 93% or more, and thus a good image forming effect can be obtained.
In this embodiment, the microlenses 130 have the same size and shape.
In this embodiment, a surface of the microlens 130 attached to the transparent substrate 110 is a first attaching surface 131. The shape of the first hollow structures 191 is the same as that of the corresponding first attachment surface 131, each edge of the first hollow structures 191 is parallel to the edge of the corresponding side of the corresponding first attachment surface 131, and the sizes of the plurality of first hollow structures 191 are the same. Therefore, the light-gathering efficiency of the edge of the light-gathering position corresponding to each microlens 130 is consistent, and the phenomenon that the definition of the pattern formed by the microlens assembly 100 is suddenly high or low is avoided, that is, the imaging effect of the microlens assembly 100 is improved.
In this embodiment, the microlenses 130 are regular hexagonal microlenses, and have a simple structure and are easy to mold. Of course, in another possible embodiment, the microlenses 130 are not limited to regular hexagonal microlenses, but may also be polygonal microlenses such as regular triangular microlenses, square microlenses, or regular pentagonal microlenses.
As shown in fig. 4 and 5, another embodiment of the present invention provides a microlens assembly 200, which is different from the microlens assembly 100 in that:
the microlens assembly 200 further includes a second light-shielding layer 150 disposed on the first surface 111 of the transparent substrate 110 and between the transparent substrate 110 and the array of microlenses 130. The second light-shielding layer 150 has a plurality of second hollow structures 151 corresponding to the microlenses 130 one by one. In a direction perpendicular to the first surface 111, a central axis of the second hollow structure 151 coincides with a central axis of the corresponding microlens 130, as shown by a dotted line a in fig. 4. That is, in a direction perpendicular to the first surface 111, the central axis of the first hollow structure 191 coincides with the central axis of the corresponding second hollow structure 151. The projection of the first hollow-out structure 191 on the second light-shielding layer 150 completely falls on the second hollow-out structure 151, and has a gap with the edge of the second hollow-out structure 151.
Specifically, in the present embodiment, the microlenses 130 are regular hexagonal microlenses 130. The outer diameter of the first hollow structure 191 is smaller than the inner diameter of the second hollow structure 151, so that the projection of the first hollow structure 191 on the second light shielding layer 150 completely falls on the corresponding second hollow structure 151, and has an interval with the edge of the second hollow structure 151.
The second light-shielding layer 150 may be disposed to shield the parasitic light having a large incident angle transmitted through the transparent substrate 110. Therefore, the consistency of the definition of the image formed after the incident light penetrates through the micro lens 130 is further improved, and the light-gathering efficiency of the micro lens 130 is improved, namely, the imaging effect is improved. That is, the second light-shielding layer 150 and the first light-shielding layer 190 work together to improve the light-gathering efficiency of the microlens 130 and the imaging effect.
Specifically, referring to fig. 3, the L4 enters the micro lens and then enters the second light-shielding layer 150, and is shielded by the second light-shielding layer 150. The incident angle of the L4 is larger than that of the incident light having the smallest incident angle that the first light shielding layer 190 can shield. Incident light having an incident angle larger than L4 is blocked by the second light-blocking layer 150 and the first light-blocking layer 190 in this order, and thus stray light having a large incident angle can be better blocked. Thereby further improving the uniformity of the sharpness of the image formed by the microlenses 130 and improving the light-gathering efficiency of the microlenses, i.e., improving the molding effect.
Optionally, referring to fig. 5, the width w2 of the portion between two adjacent second hollow structures 151 is greater than 1 μm, so that stray light with a large incident angle can be shielded well, and a good imaging effect is obtained.
Optionally, the thickness of the second light shielding layer 150 is 0.8 μm to 3 μm. Therefore, the second light-shielding layer 150 can better absorb stray light with a larger incident angle, and the excessive increase of the thickness of the microlens assembly 200 due to the arrangement of the second light-shielding layer 150 is avoided. Specifically, the thickness of the second light-shielding layer 150 may be 0.8 μm, 0.9 μm, 1.0 μm, 1.2 μm, 1.4 μm, 1.6 μm, 1.8 μm, 2.0 μm, 2.2 μm, 2.4 μm, 2.5 μm, 2.6 μm, 2.8 μm, 2.9 μm, or 3 μm.
Optionally, the second light shielding layer 150 is a titanium layer, a chromium layer, a silicon dioxide layer, or a silicon carbide 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. The second light-shielding layer 150 may be formed by evaporation or coating of photoresist.
It is to be understood that the thicknesses of the second light-shielding layer 150 and the first light-shielding layer 190 may be the same or different, and similarly, the material forming the second light-shielding layer 150 and the material forming the first light-shielding layer 190 may be the same or different.
In this embodiment, a surface of the microlens 130 attached to the transparent substrate 110 is a first attaching surface 131. The second hollow structures 151 have the same shape as the corresponding first attachment surface 131, each edge of the second hollow structures 151 is parallel to the corresponding edge of the first attachment surface 131, and the plurality of second hollow structures 151 have the same size. Therefore, the light condensing efficiency of the edge of the light condensing position corresponding to each microlens 130 is consistent, and the phenomenon that the definition of the pattern formed by the microlens assembly 200 is suddenly high or low is avoided, that is, the imaging effect of the microlens assembly 200 is improved.
As shown in fig. 6 and 7, another embodiment of the present invention provides a microlens assembly 300, which is different from the microlens assembly 100 in that:
the second surface 113 of the transparent substrate 110 has a plurality of protrusions 1141 corresponding to the first hollow structures 191, respectively, so that the protrusions 1141 correspond to the microlenses 130 one by one. The protrusions 1141 form relatively recessed regions 114 therebetween. In a direction perpendicular to the first surface 111, a central axis of the protrusion 1141 coincides with a central axis of the corresponding microlens 130, that is, a central axis of the protrusion 1141 coincides with a central axis of the corresponding first hollow structure 191, as shown by a dotted line a in fig. 6. The projection of the protrusion 1141 on the first light-shielding layer 190 completely falls on the first light-shielding layer 190, and is spaced from the edge of the first hollow structure 191. The microlens assembly 300 further includes an embedded light blocking structure 160 filled in the relatively recessed region 114.
In this embodiment, the embedded light shielding structure 160 is flush with the surface of the protrusion 1141 after filling the corresponding recessed region 114.
In this embodiment, the microlenses 130 are regular hexagonal microlenses 130. The inner diameter of the protrusion 1141 is larger than the outer diameter of the first hollow structure 191, so that the projection of the protrusion 1141 on the first hollow structure 191 completely falls on the first hollow structure 191, and is spaced from the edge of the first hollow structure 191.
The embedded light shielding structure 160 can first shield part of the parasitic light with a large incident angle entering the transparent substrate 110. Therefore, the consistency of the definition of the image formed after the incident light penetrates through the micro lens 130 is further improved, and the light-gathering efficiency of the micro lens 130 is improved, namely, the imaging effect is improved. That is, the first light shielding layer 190 and the embedded light shielding structure 160 work together to better improve the light condensing efficiency of the microlens 130 and improve the imaging effect.
Specifically, referring to fig. 6, the L5 enters the micro lens and then enters the embedded light shielding structure 160, and is shielded by the embedded light shielding structure 160. The incident angle of the L5 is larger than that of the incident light having the smallest incident angle that the first light shielding layer 190 can shield. Incident light having an incident angle larger than L5 is blocked by the embedded light-shielding structure 160 and the first light-shielding layer 190 in sequence, so that stray light having a large incident angle can be better blocked. Thereby further improving the uniformity of the sharpness of the image formed by the microlenses 130 and improving the light-gathering efficiency of the microlenses, i.e., improving the molding effect.
Optionally, the embedded light shielding structure 160 is an epoxy light shielding structure. The epoxy resin shading structure has a good light absorption effect. It is understood that, in another possible embodiment, the embedded light shielding structure 160 is not limited to an epoxy light shielding structure, but may be a black light shielding structure such as a titanium structure, a chromium structure, a silicon dioxide structure, or a silicon carbide structure.
In this embodiment, a surface of the microlens 130 attached to the transparent substrate 110 is a first attaching surface 131. The shape of the protrusion 1141 is the same as that of the corresponding first attachment surface 131, each edge of the protrusion 1141 is parallel to an edge of the corresponding side of the corresponding first attachment surface 131, and the plurality of protrusions 1141 have the same size. Therefore, the light-gathering efficiency of the edge of the light-gathering position corresponding to each microlens 130 is consistent, and the phenomenon that the definition of the pattern formed by the microlens assembly 300 is suddenly high or low is avoided, that is, the imaging effect of the microlens assembly 300 is improved.
It should be noted that, in order to avoid the fragmentation of the transparent substrate 110, the depth of the relative recess region 114 is smaller than the thickness of the transparent substrate 110.
As shown in fig. 8, another embodiment of the present invention provides a microlens assembly 400, which is different from the microlens assembly 300 in that: the opposite recessed region 114 is disposed on the first surface 111 of the transparent substrate 110. Likewise, the embedded light shielding structure 160 is filled in the relatively recessed region 114. The first light shielding layer 190 and the embedded light shielding structure 160 work together to improve the light condensing efficiency of the microlens 130 and improve the imaging effect.
As shown in fig. 9 and 10, another embodiment of the present invention provides a microlens assembly 500, which is different from the microlens assembly 100 in that:
the second surface 113 of the transparent substrate 110 is provided with a plurality of annular grooves 115 corresponding to the microlenses 130 one to one. The central axis of the inner circle of the annular groove 115 coincides with the central axis of the corresponding microlens 130 in a direction perpendicular to the first surface 111, as indicated by the dotted line a in fig. 9. The projection of the inner ring of the annular groove 115 on the first light shielding layer 190 completely falls on the first light shielding portion of the first light shielding layer 190, and is spaced from the first hollow structure 191. The microlens assembly 500 further includes a ring-shaped cylindrical light shielding structure 170 filled in the annular groove 115.
In this embodiment, the ring-shaped light-shielding structure 170 is flush with the surface of the second surface 113 of the transparent substrate 130 after filling the ring-shaped groove 115.
In this embodiment, the microlenses 130 are regular hexagonal microlenses 130. The inner diameter of the inner ring of the annular groove 115 is larger than the outer diameter of the first hollow structure 191, so that the projection of the inner ring of the annular groove 115 on the first light shielding layer 190 completely falls on the corresponding first light shielding layer 190, and a gap is formed between the inner ring of the annular groove 115 and the edge of the first hollow structure 191.
The ring-shaped light shielding structure 170 may first partially shield the stray light with a large incident angle entering the transparent substrate 110. Therefore, the consistency of the definition of the image formed after the incident light penetrates through the micro lens 130 is further improved, and the light-gathering efficiency of the micro lens 130 is improved, namely, the imaging effect is improved. That is, the first light shielding layer 190 and the annular cylindrical light shielding structure 170 act together, so that the light condensing efficiency of the microlens 130 can be improved better, and the imaging effect can be improved.
Specifically, referring to fig. 9, L6 enters the micro lens and then enters the ring-shaped light-shielding structure 170, and is shielded by the ring-shaped light-shielding structure 170. The incident angle of the L6 is larger than that of the incident light having the smallest incident angle that the first light shielding layer 190 can shield. Incident light with an incident angle larger than L6 is sequentially blocked by the annular columnar light-blocking structure 170 and the first light-blocking layer 190, so that stray light with a large incident angle can be better blocked. Thereby further improving the uniformity of the sharpness of the image formed by the microlenses 130 and improving the light-gathering efficiency of the microlenses, i.e., improving the molding effect.
Optionally, the ring-shaped pillar light shielding structure 170 is an epoxy light shielding structure. The epoxy resin shading structure has a good light absorption effect. It is understood that, in another possible embodiment, the ring-shaped pillar-shaped light shielding structure 170 is not limited to the epoxy light shielding structure, and may be a black light shielding structure such as a titanium structure, a chromium structure, a silicon dioxide structure, or a silicon carbide structure.
In this embodiment, a surface of the microlens 130 attached to the transparent substrate 110 is a first attaching surface 131. The shape of the projection of the inner ring of the annular groove 115 on the first surface 111 is the same as the shape of the outer ring of the corresponding first abutting surface 131, each edge of the projection of the inner ring of the annular groove 115 on the first surface 111 is parallel to the edge of the corresponding side of the corresponding first abutting surface 131, and the sizes of the inner rings of the plurality of annular grooves 115 are the same. Therefore, the light condensing efficiency of the edge of the light condensing position corresponding to each microlens 130 is consistent, and the phenomenon that the definition of the pattern formed by the microlens assembly 500 is suddenly high or low is avoided, that is, the imaging effect of the microlens assembly 500 is improved.
Specifically, in the present embodiment, the annular groove 115 has a regular hexagonal annular column shape. I.e. the outer and inner rings of the annular groove 115 are of the same shape. It will be appreciated that in other possible embodiments, the outer and inner rings of the annular groove 115 may also be shaped differently.
As shown in fig. 11, another embodiment of the present invention provides a microlens assembly 600, which is different from the microlens assembly 500 in that an annular groove 115 is formed on the first surface 111 of the transparent substrate 110. Likewise, the annular pillar-shaped light shielding structure 170 is filled in the annular groove 115. The first light shielding layer 190 and the annular columnar light shielding structure 170 work together to improve the light condensing efficiency of the microlens 130 and improve the imaging effect.
As shown in fig. 12, another embodiment of the present invention provides a microlens assembly 700, which is different from the microlens assembly 200 in that:
the second surface 113 of the transparent substrate 110 is provided with a relatively recessed region 114. The microlens assembly 700 also includes an embedded light blocking structure 160 filled in the relatively recessed region 114.
In addition, it can be understood that the first light-shielding layer 190 is located on a side of the embedded light-shielding structure 160 away from the microlenses 130, so that the outer diameter of the first hollow-out structure 191 is smaller than the inner diameter of the protrusion 1141.
The second light-shielding layer 150, the first light-shielding layer 190 and the embedded light-shielding structure 160 work together to better shield stray light with a large incident angle. Therefore, the consistency of the definition of the image formed after the incident light penetrates through the micro lens 130 is further improved, and the light-gathering efficiency of the micro lens 130 is improved, namely, the imaging effect is improved.
Specifically, referring to fig. 12, the incident light with an incident angle larger than L5 is sequentially shielded by the embedded light-shielding structure 160 and the first light-shielding layer 190, and the incident light with an incident angle larger than L4 is sequentially shielded by the second light-shielding layer 150, the embedded light-shielding structure 160 and the first light-shielding layer 190, so that the stray light with a large incident angle can be better shielded. Thereby further improving the uniformity of the sharpness of the image formed by the microlenses 130 and improving the light-gathering efficiency of the microlenses, i.e., improving the molding effect.
The specific arrangement of the embedded light shielding structure 160 refers to the arrangement of the embedded light shielding structure 160 in the microlens assembly 300, and is not described herein again.
Of course, in another possible embodiment, the embedded light-shielding junction may also be disposed on the first surface of the transparent substrate, which is not described herein again.
It is understood that the top views of micro-lens assembly 200, micro-lens assembly 300, micro-lens assembly 400, micro-lens assembly 500, micro-lens assembly 600, and micro-lens assembly 700 are all the same as the top view of micro-lens assembly 100.
It is understood that, in another possible embodiment, the second light shielding layer, the first light shielding layer and the annular cylindrical light shielding structure may be disposed at the same time, so that the second light shielding layer, the first light shielding layer and the annular cylindrical light shielding structure cooperate to better shield the parasitic light with a larger incident angle. Therefore, the consistency of the definition of an image formed after the incident light penetrates through the micro lens is further improved, the light condensation efficiency of the micro lens is improved, and the imaging effect is improved.
An embodiment of the utility model provides a fingerprint identification module is still provided, it includes the utility model provides a little lens subassembly.
Above-mentioned fingerprint identification module can shelter from the great parasitic light of incident angle through first light shield layer to improve the incident light and see through the uniformity of the definition of the image that forms behind the microlens, improve microlens spotlight efficiency, improve the imaging promptly.
An embodiment of the utility model provides an electronic equipment is still provided, it includes the utility model provides a fingerprint identification module.
Above-mentioned electronic equipment can shelter from the great parasitic light of incident angle through first light shield layer to improve the incident light and see through the uniformity of the definition of the image that forms behind the microlens, improve microlens spotlight efficiency, improve the formation of image effect promptly.
Specifically, the electronic device may be a mobile phone, a camera, a tablet computer, or the like.
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 represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (13)
1. A microlens assembly, comprising:
a transparent substrate having opposing first and second surfaces;
the micro-lens array comprises a plurality of micro-lenses which are arranged on the first surface of the transparent substrate and are arranged in an array; the micro lenses are polygonal micro lenses, the adjacent micro lenses share the same edge, and the plurality of micro lenses are integrally connected in a seamless mode; and
the first shading layer is arranged on the second surface of the transparent substrate; the first light shielding layer is provided with a plurality of first hollow structures which correspond to the micro lenses one by one; in the direction perpendicular to the first surface, the central axis of the first hollow structure is superposed with the central axis of the corresponding micro lens; the part, not provided with the first hollow structure, of the first light shielding layer is a first light shielding part, and the edges of the projection of the micro lens on the first light shielding layer are all located on the first light shielding part of the first light shielding layer and are spaced from the first hollow structure.
2. The micro-lens assembly of claim 1, wherein the first light shielding layer is a titanium layer, a chromium layer, a silicon dioxide layer, or a silicon carbide layer; and/or the thickness of the first shading layer is 0.8-3 μm.
3. The microlens assembly of claim 1, wherein the surface of the microlens that conforms to the transparent substrate is a first mating surface; the shape of the first hollow structure is the same as that of the corresponding first attaching surface, each edge of the first hollow structure is parallel to the edge of the corresponding side of the corresponding first attaching surface, and the first hollow structures are the same in size.
4. The micro-lens assembly as claimed in claim 3, wherein a distance between two adjacent first hollow structures of the first light shielding layer is greater than 3 μm.
5. The microlens assembly of claim 1, further comprising a second light-shielding layer disposed on the first surface of the transparent substrate and between the transparent substrate and the microlens array; the second light shielding layer is provided with a plurality of second hollow structures which correspond to the micro lenses one by one; in the direction perpendicular to the first surface, the central axis of the second hollow structure is superposed with the central axis of the corresponding micro lens; the projection of the first hollow structure on the second light shielding layer completely falls on the second hollow structure, and a gap is formed between the projection of the first hollow structure and the edge of the second hollow structure.
6. The micro-lens assembly of claim 5, wherein the second light-shielding layer is a titanium layer, a chromium layer, a silicon dioxide layer, or a silicon carbide layer; and/or the thickness of the second shading layer is 0.8-3 μm.
7. The microlens assembly of claim 5, wherein the surface of the microlens that conforms to the transparent substrate is a first mating surface; the shape of the second hollow structure is the same as that of the corresponding first binding face, each edge of the second hollow structure is parallel to the edge of the corresponding side of the corresponding first binding face, and the second hollow structures are the same in size.
8. The micro-lens assembly of any one of claims 1 to 7, wherein the first surface or the second surface of the transparent substrate is provided with a plurality of protrusions corresponding to the first hollow structures one to one; in a direction perpendicular to the first surface, a central axis of the protrusion coincides with a central axis of the corresponding microlens; the edge of the projection of the protrusion on the first light shielding layer completely falls on the first light shielding part of the first light shielding layer, and is spaced from the first hollow structure; the micro-lens assembly further comprises an embedded shading structure filled in the relative concave areas formed between the protrusions.
9. The microlens assembly of claim 8, wherein the surface of the microlens that conforms to the transparent substrate is a first mating surface; the convex shape is the same as the shape of the corresponding first binding face, each convex edge is parallel to the corresponding edge of the corresponding side of the corresponding first binding face, and the convex sizes are the same.
10. The microlens assembly as claimed in any one of claims 1 to 7, wherein the first surface or the second surface of the transparent substrate is provided with a plurality of annular grooves corresponding one-to-one to the microlenses; in a direction perpendicular to the first surface, a central axis of an inner ring of the annular groove coincides with a central axis of the corresponding microlens; the projection of the inner ring of the annular groove on the first shading layer is completely arranged on the first shading part of the first shading layer, and a gap is formed between the projection of the inner ring of the annular groove and the first shading part of the first shading layer; the micro-lens component also comprises a ring-column-shaped shading structure filled in the annular groove.
11. The microlens assembly of claim 10, wherein the surface of the microlens that conforms to the transparent substrate is a first mating surface; the shape of the projection of the inner ring of the annular groove on the first surface is the same as the shape of the corresponding outer ring of the first binding surface, each edge of the projection of the inner ring of the annular groove on the first surface is parallel to the corresponding edge of the corresponding side of the first binding surface, and the inner rings of the annular grooves are the same in size.
12. A fingerprint identification module comprising the microlens assembly of any one of claims 1 to 11.
13. An electronic device comprising the fingerprint recognition module of claim 12.
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| CN112327391A (en) * | 2020-10-20 | 2021-02-05 | 上海悠睿光学有限公司 | Preparation method of micro-lens array, micro-lens array and under-screen fingerprint module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112327391A (en) * | 2020-10-20 | 2021-02-05 | 上海悠睿光学有限公司 | Preparation method of micro-lens array, micro-lens array and under-screen fingerprint module |
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Address after: 330096 No.699 Tianxiang North Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Patentee after: Jiangxi OMS Microelectronics Co.,Ltd. Address before: 330000 east of Xueyuan 6th Road, south of Tianxiang Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Patentee before: OFilm Microelectronics Technology Co.,Ltd. Address after: 330000 east of Xueyuan 6th Road, south of Tianxiang Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Patentee after: OFilm Microelectronics Technology Co.,Ltd. Address before: 330029 No. 1189 Jingdong Avenue, Nanchang high tech Zone, Jiangxi Patentee before: NANCHANG OFILM BIO-IDENTIFICATION TECHNOLOGY Co.,Ltd. |