CN212256336U - Fingerprint recognition device under screen and electronic equipment - Google Patents
Fingerprint recognition device under screen and electronic equipment Download PDFInfo
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- CN212256336U CN212256336U CN202022086197.9U CN202022086197U CN212256336U CN 212256336 U CN212256336 U CN 212256336U CN 202022086197 U CN202022086197 U CN 202022086197U CN 212256336 U CN212256336 U CN 212256336U
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Abstract
The utility model discloses a screen fingerprint identification device and an electronic device, wherein the screen fingerprint identification device comprises a micro-lens array component and an image sensor; the micro lens array component comprises a light guide channel part and a micro lens array, the micro lens array is composed of micro lenses arranged in an array mode through a plurality of micro lenses, the light guide channel part and the micro lens array are integrally formed, the micro lens array, the light guide channel part, the image sensor from top to bottom is sequentially stacked, the micro lenses correspond to the image sensor, the light guide channel part is composed of light guide pieces arranged in an array mode through a plurality of micro lenses, the micro lens array component further comprises a diaphragm, a plurality of conical through holes arranged in an array mode are formed in the diaphragm, the light guide pieces are located in the conical through holes, and the adjacent light guide pieces are filled with the diaphragm. The utility model discloses can solve the clearance that prior art is in the light between the layer and take place light easily and crosstalk, problem with high costs.
Description
Technical Field
The utility model relates to an electronic equipment technical field especially relates to a fingerprint recognition device and electronic equipment under screen.
Background
With the rapid development of mobile electronic devices such as mobile phones, biometric identification technology is gradually popularized, and fingerprint identification under a screen is one of biometric identification technologies, so as to become one of the mainstream configurations of the mobile phones at present.
At present, the technology of fingerprint identification under a screen mainly adopts a micro-lens array imaging and a micro-lens array light guide identification device, and the micro-lens array light guide identification device carries out fingerprint identification by collecting the contrast of brightness and darkness of fingerprint valley ridges.
However, in the conventional microlens array light guide identification device, a single-layer or multi-layer light blocking layer is mainly manufactured through a photoetching process, light crosstalk easily occurs in gaps between the light blocking layers, the brightness contrast of fingerprint valley ridges is reduced, and the fingerprint identification accuracy is influenced. In addition, in the conventional microlens array light guide and identification device, a plurality of microlenses need to correspond to a plurality of image sensors, so that the cost is high.
SUMMERY OF THE UTILITY MODEL
Therefore, an object of the present invention is to provide a fingerprint identification device under a screen to solve the problem that the light crosstalk and the cost are high easily occurred in the gap between the light blocking layers in the prior art.
An underscreen fingerprint identification device includes a microlens array assembly and an image sensor;
the micro lens array assembly comprises a light guide channel part and a micro lens array, the micro lens array is composed of a plurality of micro lenses which are arranged in an array mode, the light guide channel part and the micro lens array are integrally formed, the micro lens array, the light guide channel part and the image sensor are sequentially arranged in a stacking mode from top to bottom, a plurality of micro lenses correspond to one image sensor, the light guide channel part is composed of a plurality of light guide pieces which are arranged in an array mode, and the light guide pieces are arranged corresponding to the micro lenses;
the micro lens array assembly further comprises a diaphragm, a plurality of conical through holes arranged in an array are formed in the diaphragm, the conical through holes are close to one end of the micro lens array, the diameter of the one end of the micro lens array is larger than that of the one end of the image sensor, the light guide pieces are located in the conical through holes and are adjacent to each other, and the diaphragm is filled between the light guide pieces.
According to the utility model provides a fingerprint recognition device under screen, light through microlens transmits to image sensor through leaded light spare, because leaded light spare is located the toper through-hole, and fills by the diaphragm between the adjacent leaded light spare, has formed the three-dimensional structure that is in the light from this, utilizes the extinction performance of the diaphragm of leaded light spare lateral wall, can intercept more stray light, effectively reduces light and crosstalks, has greatly improved the bright and dark contrast ratio of fingerprint millet ridge. In addition, the mode that a plurality of micro lenses correspond to one image sensor is adopted, the number of the image sensors is reduced, and the cost is reduced.
In addition, according to the utility model discloses foretell fingerprint identification equipment under screen can also have following additional technical characterstic:
further, the under-screen fingerprint identification device satisfies the following conditional expression:
DL≤W/2；
wherein DL is the width of the micro lens, and W is the size of the pixel of the image sensor.
Furthermore, one surface of the diaphragm close to the image sensor and one surface of the light guide channel part close to the image sensor are located on the same plane, and the under-screen fingerprint identification device meets the following conditional expression:
0.9*H1*DL/H2≤D1≤DL；
wherein D1 is the diameter of the tapered through hole near one end of the microlens array, H1 is the height of the diaphragm, and H2 is the total height of the microlens array assembly.
Further, the under-screen fingerprint identification device satisfies the following conditional expression:
0.1*H1*DL/H2≤D2≤0.5*DL；
wherein D2 is the diameter of the tapered through hole near one end of the image sensor.
Further, the value range of H2 is 30-100 μm.
Further, the value range of H1 is 30-95 μm.
Furthermore, the micro lens is a rectangular convex lens, and the convex surface of the micro lens is arranged back to the light guide channel part.
Further, the central line of the micro lens is coincident with the central line of the corresponding light guide piece.
Further, the focal point of the microlens is located between a first plane and the image sensor, the first plane being a plane where the height of the diaphragm of 1/2 is located.
Another object of the present invention is to provide an electronic device using the fingerprint identification device under screen.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural view of an underscreen fingerprint recognition apparatus according to a first embodiment of the present invention;
FIG. 2 is a schematic perspective view of a light guide channel and a microlens array;
FIG. 3 is a schematic perspective view of a diaphragm;
FIG. 4 is a schematic cross-sectional view of a diaphragm;
FIG. 5 is a schematic flow chart illustrating the fabrication of a microlens array assembly;
FIG. 6 is a schematic diagram illustrating tolerance sensitivity of microlens array assembly to image sensor attachment.
Detailed Description
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. Several embodiments of the invention are given in the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
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. As used herein, the terms "vertical," "horizontal," "left," "right," "up," "down," and the like are for illustrative purposes only and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1 to 4, a fingerprint recognition device under a screen according to a first embodiment of the present invention includes a microlens array assembly 100 and an image sensor 200.
Microlens array subassembly 100 includes light guide channel portion 10 and microlens array 20, microlens array 20 is the microlens 21 that the array was arranged by a plurality of and constitutes, light guide channel portion 10 with microlens array 20 integrated into one piece, microlens array 20 light guide channel portion 10 image sensor 200 from the top down stacks gradually the setting, and is a plurality of microlens 21 corresponds one image sensor 200.
The light guide channel part 10 is composed of a plurality of light guide members 11 arranged in an array, and the light guide members 11 are substantially conical structures without conical tips. The light guide 11 and the micro lens 21 are correspondingly arranged, specifically, the central line of the micro lens 21 coincides with the central line of the light guide 11.
Microlens array assembly 100 still includes diaphragm 30, be equipped with the toper through-hole 31 that a plurality of is the array and arranges on diaphragm 30, toper through-hole 31 is close to the diameter of microlens array 20 one end is greater than toper through-hole 31 is close to the diameter of image sensor 200 one end, and is adjacent between the leaded light piece 11 by diaphragm 30 fills, also is that a leaded light piece 11 is located a toper through-hole 31, and the shape of leaded light piece 11 matches with the shape of toper through-hole 31.
Specifically, a surface of the diaphragm 30 close to the image sensor 200 and a surface of the light guide channel portion 10 close to the image sensor 200 are on the same plane.
The micro lens 21 is a rectangular convex lens, the surface of the micro lens may be any one of a spherical surface, an aspherical surface and a free-form surface, and the convex surface of the micro lens 21 is arranged opposite to the light guide channel part 10. In addition, in practical implementation, the microlens 21 may also be a convex lens having a circular shape, a hexagonal shape, an octave shape, or the like. The light guide channel 10 is made of a transparent material, which is the same as the material of the micro-lens 21. The diaphragm 30 is made of the same material as a conventional diaphragm, for example, a black light-absorbing material is used. The image sensor 200 is, for example, a Complementary Metal Oxide Semiconductor (CMOS) image sensor, a Charge Coupled Device (CCD), a thin film transistor (tft) image sensor, or other image sensors. Due to the fact that the mode that the plurality of micro lenses correspond to the image sensor is adopted, the image sensor with the larger pixel size can be adopted, the process attaching precision is reduced, meanwhile, the number of the image sensors with the same area is reduced, and the cost is reduced. The filter layer may be disposed on the image sensor 200 to filter out non-target band light such as ambient light.
The microlens array assembly 100 is manufactured by a nanoimprint process, and referring to fig. 5, the following process steps may be specifically adopted:
firstly, a master plate 101 and a master plate 102 are manufactured by laser direct writing, photoetching or an ultra-precision machine tool;
then, dripping UV transparent material glue on the mother set 101, aligning and pressing the mother set 101 and the mother set 102, and manufacturing an integrally formed light guide channel part 10 and a micro-lens array 20 with a transparent structure in a nano-imprinting mode;
then, stripping and demolding the master plate 102;
then, a light absorbing material is filled between the adjacent light guide members 11 by dropping, spin coating, or the like to obtain the aperture 30, and finally, the microlens array assembly 100 is manufactured.
The processing technology through nanometer impression can reduce the alignment precision to about 1um by 0.1um, greatly reduces the technical difficulty and production manufacturing cost.
The utility model provides a fingerprint recognition device under screen, through the integration technology of microlens and light guide channel portion, make light guide channel portion 10 and microlens array 20 become integrated into one piece's structure, have following advantage:
the cost is low by using a nano-imprinting process;
the requirement on the alignment precision of the lens and the clear aperture is lowered;
for traditional lens array and the structure array disconnect-type structure that is in the light, the utility model discloses use the integral structure to use the light interface reflection that same material can prevent to cause because of the material layering, improve light and assemble efficiency.
In addition, because a plurality of microlenses 21 correspond an image sensor 200 for the microlens array subassembly need not to align when laminating with the image sensor, even misplace, has no influence to fingerprint identification performance. Fig. 6 is a sensitivity analysis of the bonding tolerance of the microlens array assembly and the image sensor in the bonding process, and it can be seen from fig. 6 that when the microlens array assembly and the image sensor are bonded, the dislocation size is between 0 μm and 100 μm, the corresponding valley-ridge contrast (in fig. 6, the ordinate is normalized) is still between the upper limit value and the lower limit value, and the fingerprint identification performance is not affected.
Further, please continue to refer to fig. 1, in this embodiment, the device for identifying fingerprints under the screen satisfies the following conditional expression:
DL≤W/2；
where DL is the width of the microlens 21 and W is the size of the pixel of the image sensor 200. In fig. 1, θ is the maximum light collection angle of the microlens 21.
The device for identifying fingerprints under the screen further meets the following conditional expression:
0.9*H1*DL/H2≤D1≤DL；
wherein D1 is the diameter of the tapered through hole 31 near one end of the microlens array 20, H1 is the height of the stop 30, and H2 is the total height of the microlens array assembly 100.
The focal point of the microlens 21 is located between the first plane 300 and the image sensor 200, and the first plane 400 is a plane where the height of the diaphragm 30 of 1/2 is located.
The device for identifying fingerprints under the screen further meets the following conditional expression:
0.1*H1*DL/H2≤D2≤0.5*DL；
wherein D2 is the diameter of the tapered through hole 31 near one end of the image sensor 200.
Preferably, the range of H2 is 30-100 μm, the range of H1 is 30-95 μm, and H2 is greater than H1.
According to fingerprint recognition device under screen that this embodiment provided, light through microlens 21 transmits to image sensor 200 through leaded light spare 11, because leaded light spare 11 is located toper through-hole 31, and fill by diaphragm 30 between the adjacent leaded light spare 11, formed the three-dimensional structure that is in the light from this, utilize the extinction performance of the diaphragm 30 of leaded light spare 11 lateral wall, can intercept more stray light, effectively reduce light and crosstalk, greatly improved the bright and dark contrast ratio of fingerprint valley ridge. In addition, the mode that a plurality of micro lenses correspond to one image sensor is adopted, the number of the image sensors is reduced, and the cost is reduced.
A second embodiment of the present invention provides an electronic device, which includes at least a fingerprint recognition device under a screen in the first embodiment, for example, a mobile phone.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
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 (10)
1. An underscreen fingerprint identification device is characterized by comprising a micro-lens array component and an image sensor;
the micro lens array assembly comprises a light guide channel part and a micro lens array, the micro lens array is composed of a plurality of micro lenses which are arranged in an array mode, the light guide channel part and the micro lens array are integrally formed, the micro lens array, the light guide channel part and the image sensor are sequentially arranged in a stacking mode from top to bottom, a plurality of micro lenses correspond to one image sensor, the light guide channel part is composed of a plurality of light guide pieces which are arranged in an array mode, and the light guide pieces are arranged corresponding to the micro lenses;
the micro lens array assembly further comprises a diaphragm, a plurality of conical through holes arranged in an array are formed in the diaphragm, the conical through holes are close to one end of the micro lens array, the diameter of the one end of the micro lens array is larger than that of the one end of the image sensor, the light guide pieces are located in the conical through holes and are adjacent to each other, and the diaphragm is filled between the light guide pieces.
2. The device for identifying fingerprints of claim 1, wherein the device for identifying fingerprints satisfies the following conditional expression:
DL≤W/2；
wherein DL is the width of the micro lens, and W is the size of the pixel of the image sensor.
3. The device according to claim 2, wherein a surface of the diaphragm close to the image sensor and a surface of the light guide channel portion close to the image sensor are in a same plane, and the device satisfies the following conditional expression:
0.9*H1*DL/H2≤D1≤DL；
wherein D1 is the diameter of the tapered through hole near one end of the microlens array, H1 is the height of the diaphragm, and H2 is the total height of the microlens array assembly.
4. The device according to claim 3, wherein the device satisfies the following conditional expression:
0.1*H1*DL/H2≤D2≤0.5*DL；
wherein D2 is the diameter of the tapered through hole near one end of the image sensor.
5. The device for identifying the underscreen fingerprint is characterized in that the value range of H2 is 30-100 μm.
6. The underscreen fingerprint recognition device of claim 3, wherein the value of H1 is in a range of 30 μm to 95 μm.
7. The device for identifying fingerprints of claim 1, wherein the microlenses are rectangular convex lenses, and convex surfaces of the microlenses are arranged opposite to the light guide channel portions.
8. The underscreen fingerprint identification device of claim 1, wherein a centerline of the microlens coincides with a centerline of the corresponding light guide.
9. The device of claim 8, wherein the focal point of the microlens is located between a first plane and the image sensor, the first plane being a plane in which the height of the diaphragm of 1/2 is located.
10. An electronic device characterized by comprising the underscreen fingerprint recognition apparatus according to any one of claims 1 to 9.
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| CN202022086197.9U CN212256336U (en) | 2020-09-21 | 2020-09-21 | Fingerprint recognition device under screen and electronic equipment |
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| CN202022086197.9U CN212256336U (en) | 2020-09-21 | 2020-09-21 | Fingerprint recognition device under screen and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112084996A (en) * | 2020-09-21 | 2020-12-15 | 上海悠睿光学有限公司 | Fingerprint recognition device under screen and electronic equipment |
| 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112084996A (en) * | 2020-09-21 | 2020-12-15 | 上海悠睿光学有限公司 | Fingerprint recognition device under screen and electronic equipment |
| 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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