CN110298333B - Fingerprint identification unit and equipment and fingerprint identification method - Google Patents
Fingerprint identification unit and equipment and fingerprint identification method Download PDFInfo
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- CN110298333B CN110298333B CN201910604854.3A CN201910604854A CN110298333B CN 110298333 B CN110298333 B CN 110298333B CN 201910604854 A CN201910604854 A CN 201910604854A CN 110298333 B CN110298333 B CN 110298333B
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- 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
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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Abstract
The application discloses a fingerprint identification unit, fingerprint identification equipment and a fingerprint identification method. The fingerprint recognition unit includes: the fingerprint detection device comprises a plurality of conductive elastic deformation units, wherein the surfaces of the elastic deformation units jointly form a fingerprint detection surface, both ends or at least one end of each elastic deformation unit are provided with potential monitoring points, and the potential monitoring points are used for being connected with an external voltage measurement device. The scheme that this embodiment provided compares optical fingerprint identification, because not influenced by the light wave penetrating power, in scenes such as cell-phone pad pasting state, has more the advantage, in addition, voltage measurement is other electrical parameters relatively, changes the measurement more, and sensitivity is higher, and is more accurate, in addition, compares fingerprint identification modes such as stacked structure, can accomplish thinly if there is the demand.
Description
Technical Field
The present invention relates to fingerprint identification technologies, and in particular, to a fingerprint identification unit and apparatus, and a fingerprint identification method.
Background
With the development of fingerprint identification technology, the fingerprint identification technology is widely applied to various fields, such as mobile phones, tablet computers, televisions and the like in electronic equipment terminals, and access controls, safety boxes and the like in safety protection systems. The fingerprint collection is realized mainly by optical, capacitive and ultrasonic imaging technologies. The fingerprint acquisition schemes are complex to implement and need to be improved.
Disclosure of Invention
At least one embodiment of the invention provides a fingerprint identification unit, fingerprint identification equipment and a fingerprint identification method, which can reduce the complexity of fingerprint identification.
To achieve the above object, at least one embodiment of the present invention provides a fingerprint identification unit, including: the fingerprint detection device comprises a plurality of conductive elastic deformation units, wherein the surfaces of the elastic deformation units jointly form a fingerprint detection surface, both ends or at least one end of each elastic deformation unit are provided with potential monitoring points, and the potential monitoring points are used for being connected with an external voltage measurement device.
In one embodiment, the plurality of conductive elastic deformation units includes:
a plurality of insulated rectangular each other, be provided with a plurality of on the rectangular potential monitoring point, rectangular quilt every subsection that potential monitoring point separated is as one elastic deformation unit.
In one embodiment, the fingerprint identification unit further comprises: with a plurality of electrically conductive and the unchangeable short strip of resistance maintenance of a plurality of rectangular one-to-one, its rectangular one end that corresponds is connected to the short strip electricity, the short strip is connected rectangular one end is provided with the electric potential monitoring point, the other end of short strip is used for connecting first voltage input end, the rectangular one end of keeping away from the short strip is used for connecting second voltage input end.
In one embodiment, the plurality of strips are the same width.
In one embodiment, the distances between adjacent potential monitoring points on the same strip are the same.
In one embodiment, the size of the elastic deformation unit is determined based on fingerprint detection accuracy.
In one embodiment, the elastic deformation unit is oil-water gel or a memory metal material.
An embodiment of the present invention provides a fingerprint identification device, including the fingerprint identification unit of any embodiment, further including a voltage measurement device electrically connected to the potential monitoring point, and a processing unit, where the processing unit is configured to:
acquiring the voltage of the potential monitoring point, and determining the voltages at two ends of the elastic deformation unit according to the voltage of the potential monitoring point;
determining the deformation height of the elastic deformation unit according to the voltage at the two ends of the elastic deformation unit, and determining the fingerprint shape corresponding to the elastic deformation unit according to the deformation height;
and determining the fingerprint according to the fingerprint shapes corresponding to all the elastic deformation units.
An embodiment of the present invention provides a fingerprint identification method, which is applied to a fingerprint identification device according to any embodiment, and includes:
acquiring the voltage of the potential monitoring point, and determining the voltages at two ends of the elastic deformation unit according to the voltage of the potential monitoring point;
determining the deformation height of the elastic deformation unit according to the voltage at the two ends of the elastic deformation unit, and determining the fingerprint shape corresponding to the elastic deformation unit according to the deformation height;
and determining the fingerprint according to the fingerprint shapes corresponding to all the elastic deformation units.
In an embodiment, the determining the deformation height of the elastic deformation unit according to the voltage across the elastic deformation unit includes:
determining the current of the elastic deformation unit;
determining the resistance of the elastic deformation unit according to the voltage at the two ends of the elastic deformation unit and the current;
and determining the cross section area of the elastic deformation unit according to the resistance, and determining the deformation height of the elastic deformation unit according to the cross section area.
Compared with the related art, an embodiment of the present invention includes that the fingerprint identification unit includes: the fingerprint detection device comprises a plurality of conductive elastic deformation units, wherein the surfaces of the elastic deformation units jointly form a fingerprint detection surface, both ends or at least one end of each elastic deformation unit are provided with potential monitoring points, and the potential monitoring points are used for being connected with an external voltage measurement device. The scheme that this embodiment provided compares optical fingerprint identification, because not influenced by the light wave penetrating power, in scenes such as cell-phone pad pasting state, has more the advantage, in addition, voltage measurement is other electrical parameters relatively, changes the measurement more, and sensitivity is higher, and is more accurate, in addition, compares fingerprint identification modes such as stacked structure, can accomplish thinly if there is the demand.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1a is a schematic side view of a fingerprint identification unit according to an embodiment of the present invention;
FIG. 1b is a schematic top view of a fingerprint identification unit according to an embodiment of the present invention;
FIG. 2 is a diagram of a fingerprint identification unit according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a fingerprint identification unit including a bar according to an embodiment of the present invention;
FIG. 4 is a diagram of a fingerprint identification unit including short bars according to an embodiment of the present invention;
FIG. 5 is a diagram of a fingerprint recognition device according to an embodiment of the present invention;
FIG. 6 is a flowchart of a fingerprint recognition method according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a fingerprint identification unit according to an embodiment of the present invention;
FIG. 8 is a schematic illustration of long and short strips provided in accordance with an embodiment of the present invention;
FIG. 9 is a top view of a base (schematic diagram of potential monitoring points) according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a fingerprint sensing surface with a fingerprint according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In one embodiment of the invention, the potential change is caused by elastic deformation, and the deformation condition is further calculated by the potential, so that the fingerprint shape is obtained.
Fig. 1a is a schematic side view of a fingerprint identification unit according to an embodiment of the present invention, and fig. 1b is a schematic top view of the fingerprint identification unit. As shown in fig. 1a and 1b, an embodiment of the present invention provides a fingerprint identification unit, including: the fingerprint detection device comprises a plurality of conductive elastic deformation units 1, wherein the surfaces of the elastic deformation units 1 jointly form a fingerprint detection surface, two ends or at least one end of each elastic deformation unit 2 are provided with potential monitoring points 3, and the potential monitoring points 3 are used for being connected with an external voltage measuring device. When the elastic deformation unit 1 is pressed, the resistance changes along with the shape change, that is, the resistance of the elastic deformation unit 1 changes along with the shape change of the elastic deformation unit 1.
The scheme that this embodiment provided compares optical fingerprint identification, because not influenced by the light wave penetrating power, in scenes such as cell-phone pad pasting state, has more the advantage, in addition, voltage measurement is other electrical parameters relatively, changes the measurement more, and sensitivity is higher, and is more accurate, in addition, compares fingerprint identification modes such as stacked structure, can accomplish thinly if there is the demand.
Wherein, the size and the shape of the elastic deformation units can be the same or different.
If only one end of the elastic deformation unit 1 is provided with a potential monitoring point, the other end of the elastic deformation unit is connected with a voltage input end, and the potential is fixed without measurement.
Wherein, the elastic deformation unit 1 generates deformation when pressed by fingers and recovers when not pressed. When the elastic deformation unit 1 deforms, the resistance of the elastic deformation unit changes correspondingly, so that the deformation degree of the elastic deformation unit 1 can be determined according to the resistance, and the fingerprint can be determined according to the deformation degree. Wherein, resistance can be confirmed according to voltage and electric current, obtains voltage through the potential monitoring point, and there are two kinds of situations in the electric current: one is to apply constant current to the elastic deformation unit 1, for example, by using a constant current source, the other is to detect the current of the elastic deformation unit 1, and there are two ways as well, one is to connect a current detection device to detect, and the other is to connect a non-deformable section of conductive strip (hereinafter referred to as a short strip) in series to the elastic deformation unit 1, the current of the conductive strip is the current of the elastic deformation unit 1, and the current of the short strip can be determined by detecting the voltage at the two ends of the short strip (the short strip is fixed in resistance due to non-deformation, and only the detection voltage is needed to determine the current).
In one embodiment, the potential monitoring point 3 is a tiny metal point, and is connected to the voltage measuring device through a wire in the base.
In an embodiment, as shown in fig. 2, the fingerprint identification unit further includes a base 2, and the elastic deformation unit 1 is disposed on the base 2.
It should be noted that the base 2 in fig. 2 is merely an example, and bases of other shapes may be used.
In an embodiment, the elastic deformation units 1 may be independent units insulated from each other, or may be a long strip, that is, a plurality of long strips are disposed, each long strip is divided into a plurality of elastic deformation units 1, as shown in fig. 3, the fingerprint identification unit includes a plurality of long strips 4 insulated from each other, a plurality of potential monitoring points 3 are disposed on the long strips 4, and each sub-segment of the long strips 4 separated by the potential monitoring points is taken as one elastic deformation unit 1. The shape and size of each strip 4 may be the same or different. The strips are adjacent to each other, and the surfaces of the strips form a fingerprint detection surface. It should be noted that only one stripe per column is shown in fig. 3, and in other embodiments, each column may be a plurality of stripes.
In an embodiment, as shown in fig. 4, the fingerprint identification unit further includes a plurality of conductive short bars 5 with a constant resistance, the plurality of conductive short bars 5 are in one-to-one correspondence with the plurality of long bars 4, the short bars 5 are electrically connected to one ends of the corresponding long bars 4, one end of the short bar 5 connected to the long bar 4 is provided with a potential monitoring point 3, the other end of the short bar 5 is used for connecting a first voltage input end VA, and one end of the long bar 4 far away from the short bar 5 is used for connecting a second voltage input end VB. It should be noted that the short strips 5 can be attached to the long strips 4 to form an electrical connection, or can be connected by wires. In one embodiment, the short bar 5 is made of a non-deformable material, such as tungsten-copper alloy, silver-copper alloy, etc. In another embodiment, the short strip 5 is placed at a position where a finger cannot press the short strip, or the short strip 5 is wrapped with a hard material to protect the short strip 5 from deformation caused by pressure, so that the resistance of the short strip 5 is maintained. Note that the short bar is a name only, and does not indicate the length thereof, and the length thereof may be set as necessary.
Wherein, the short strip 5 can be disposed at the same end of the strip 4, or disposed at different ends of the strip 4, or disposed at the middle position of the strip 4, which is not limited in the present application.
In one embodiment, VA is a ground terminal, and VB is a reference voltage terminal, and the voltage thereof is, for example, 5V.
In one embodiment, the plurality of strips 4 are of the same width. The present application is not limited to this, and the width of the strip 4 may be different.
In one embodiment, the distance between adjacent potential monitoring points on the same strip 4 is the same. When the distances are the same, the subsequent calculation of the deformation height can be simpler. In the present application, this is not limited to this, and the distances may be different, and the distribution positions of the potential monitoring points 3 on different strips may be the same or different.
In one embodiment, the size of the elastic deformation unit 1 is determined based on fingerprint detection accuracy. In an embodiment, the width of the strip 4 is smaller than the predetermined fingerprint detection accuracy, and the distance between the adjacent potential monitoring points 3 on the same strip 4 is smaller than the predetermined fingerprint detection accuracy.
In one embodiment, the elastic deformation unit 1 is an oil hydrogel or a memory metal material, i.e., is implemented by using an oil hydrogel or a memory metal material. It should be noted that, this is merely an example, and other elastically deformable conductive materials may also be used, which is not limited in this application.
In an embodiment, the fingerprint identification unit further comprises an insulating layer located on a fingerprint detection surface formed by the elastic deformation unit 1, so that water resistance and sweat resistance are achieved. The insulating layer does not affect the deformation of the elastic deformation unit 1 when being pressed.
Based on the same inventive concept, as shown in fig. 5, an embodiment of the present invention provides a fingerprint identification device, which includes the fingerprint identification unit 10 of any embodiment, further includes a voltage measuring device 20 electrically connected to the potential monitoring point, and a processing unit 30, wherein the processing unit 30 is configured to,
acquiring the voltage of the potential monitoring point 3 measured by the voltage measuring device 20, and determining the voltages at the two ends of the elastic deformation unit 1 according to the voltage of the potential monitoring point 3;
determining the deformation height of the elastic deformation unit 1 according to the voltage at the two ends of the elastic deformation unit 1, and determining the fingerprint shape corresponding to the elastic deformation unit 1 according to the deformation height;
and determining the fingerprint according to the fingerprint shapes corresponding to all the elastic deformation units 1.
The fingerprint identification equipment that this embodiment provided confirms the fingerprint according to the parameter of voltage, compares optical fingerprint identification, because not influenced by light wave penetrating power, at scenes such as cell-phone pad pasting state, has more the advantage, in addition, voltage measurement is other electrical parameters relatively, changes the measurement, and sensitivity is higher, and is more accurate.
As shown in fig. 6, an embodiment of the present invention provides a fingerprint identification method, applied to the fingerprint identification device, including:
601, acquiring the voltage of the potential monitoring point 3, and determining the voltages at two ends of the elastic deformation unit 1;
The fingerprint identification method provided by the embodiment determines the fingerprint according to the voltage, and compared with other electrical parameters, the voltage measurement is easier to measure, the sensitivity is higher, and the fingerprint identification is more accurate.
In one embodiment, the step 602 of determining the deformation height of the elastically deforming unit 1 according to the voltage across the elastically deforming unit 1 includes:
determining the current of the elastic deformation unit 1; for example, if the short bar resistance is determined to be R1, one end of the short bar is grounded, and the voltage of the potential monitoring point at the other end is V1, the current in the short bar is I (I ═ V1/R1); or, obtaining the current of the constant current source as the current of the elastic deformation unit 1;
determining the resistance of the elastic deformation unit 1 according to the voltage at the two ends of the elastic deformation unit 1 and the current; assuming that the voltage at one end of the elastic deformation unit 1 is V2 and the voltage at the other end is V3, the voltage is V3-V2, the current is I, and the resistance R2 of the elastic deformation unit is (V3-V2)/I;
and determining the cross section area of the elastic deformation unit 1 according to the resistance, and determining the deformation height of the elastic deformation unit 1 according to the cross section area. According to the formula R2 ═ ρ L/S (where R2 has been obtained, ρ is the material resistivity and is a known parameter, and L is the length of the elastic deformation element 1 and is a known parameter), the cross-sectional area S of the elastic deformation element 1 after deformation can be obtained, and taking the cross-section of the elastic deformation element 1 as a rectangle, the deformation height H can be obtained according to the formula S ═ W ═ H (W is the width of the elastic deformation element and is known); it should be noted that, in the present embodiment, the cross section of the elastic deformation unit 1 is square, but the present application is not limited thereto, and the elastic deformation unit may also be in other shapes, and accordingly, the deformation height may be calculated by using an area calculation formula in other shapes.
In an embodiment, in the step 602, determining the fingerprint shape corresponding to the elastically deforming unit 1 according to the deformation height includes: according to the deformation height (assumed as H) and the height H0 when the elastic deformation unit 1 is not deformed, the fingerprint shape corresponding to the elastic deformation unit 1 can be determined according to the difference between H and H0.
The present application is further illustrated by the following specific example.
As shown in fig. 7, in the present embodiment, the fingerprint identification unit includes a base, a plurality of strips disposed on the base and insulated from each other, the strips are closely arranged, a surface of each strip opposite to the base forms a fingerprint detection surface, a total width of each strip is 2cm, a length of each strip is 3cm, a height of each strip is 0.15cm, referring to fig. 1, the base has a width of 2.5cm, a height of 1cm, and a length of 3.5 cm. It should be noted that the above parameters are examples, and may be changed as needed. In addition, the shape thereof may be changed as needed. In the present embodiment, the shape is a rounded rectangle, but the present application is not limited thereto, and other shapes are possible.
As shown in fig. 8, each strip is divided into a plurality of equidistant sections, each equidistant section is an elastic deformation unit 1, and potential monitoring points (the potential monitoring points are fixed on the base) are arranged at the boundary points of the equidistant sections of each strip (as shown in the arrow of fig. 8, and as shown in the top view of the base of fig. 9); the potential monitoring point is a tiny metal point, and the lower end of the potential monitoring point is connected to the voltage measuring device in the base through a lead; due to the use of potential monitoring, voltage change monitoring caused by micro deformation is sensitive and accurate enough to deal with the fine accuracy of fingerprint identification.
One end of the long strip is an undeformable short strip 5, and the resistance value of the long strip is the resistance value of a single deformable equidistant section when the long strip is not deformed, which needs to be described, the resistance value is only an example, and the resistance value of the short strip is not limited thereto; the end of the short strip 5 far away from the long strip is grounded, the end of the long strip far away from the short strip 5 is connected with a reference potential, the reference potential is 5V for example, and the short strip 4 is electrically connected with the long strip, and the currents of the two are consistent.
As shown in fig. 10, when a finger presses downwards, each bar deforms elastically, and the deformation causes a change in resistance of a material between potential monitoring points, so that a voltage monitored by the potential monitoring points changes, a deformation height of each section can be obtained from a voltage of each section, a shape of a fingerprint corresponding to each section can be calculated from the deformation height of each section, and the shape of the whole fingerprint can be obtained from the deformation of all sections, so that the purpose of fingerprint identification is achieved;
when the finger leaves, the finger is restored to the original state according to the material characteristics, so that the fingerprint identification device is restored to the initial state to wait for the next use.
The following points need to be explained:
(1) the drawings of the embodiments of the invention only relate to the structures related to the embodiments of the invention, and other structures can refer to common designs.
(2) The thickness of layers or regions in the figures used to describe embodiments of the invention may be exaggerated or reduced for clarity, i.e., the figures are not drawn on a true scale.
(3) Without conflict, embodiments of the present invention and features of the embodiments may be combined with each other to arrive at new embodiments.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A fingerprint identification unit comprising: the fingerprint detection device comprises a plurality of conductive elastic deformation units, a fingerprint detection surface and a fingerprint detection surface, wherein the surfaces of the elastic deformation units jointly form the fingerprint detection surface, and potential monitoring points are arranged at two ends or at least one end of each elastic deformation unit and are used for being connected with an external voltage measurement device;
the plurality of conductive elastic deformation units include:
a plurality of strips which are insulated from each other, wherein a plurality of potential monitoring points are arranged on the strips, and each subsection of the strips separated by the potential monitoring points is used as one elastic deformation unit;
the fingerprint recognition unit further includes: with a plurality of electrically conductive and the unchangeable short strip of resistance maintenance of a plurality of rectangular one-to-one, its rectangular one end that corresponds is connected to the short strip electricity, the short strip is connected rectangular one end is provided with the electric potential monitoring point, the other end of short strip is used for connecting first voltage input end, the rectangular one end of keeping away from the short strip is used for connecting second voltage input end.
2. The fingerprint identification unit of claim 1, wherein the plurality of strips are the same width.
3. The fingerprint identification unit of claim 1 wherein adjacent potential monitoring points on the same strip are equidistant.
4. The fingerprint recognition unit of any one of claims 1 to 3, wherein the size of the elastic deformation unit is determined based on fingerprint detection accuracy.
5. The fingerprint identification unit of any one of claims 1 to 3, wherein the elastically deformable unit is oil-water gel or memory metal material.
6. A fingerprint recognition apparatus comprising a fingerprint recognition unit according to any one of claims 1 to 5, further comprising a voltage measuring device electrically connected to the potential monitoring point, and a processing unit for:
acquiring the voltage of the potential monitoring point, and determining the voltages at two ends of the elastic deformation unit according to the voltage of the potential monitoring point;
determining the deformation height of the elastic deformation unit according to the voltage at the two ends of the elastic deformation unit, and determining the fingerprint shape corresponding to the elastic deformation unit according to the deformation height;
and determining the fingerprint according to the fingerprint shapes corresponding to all the elastic deformation units.
7. A fingerprint recognition method applied to the fingerprint recognition device according to claim 6, comprising:
acquiring the voltage of the potential monitoring point, and determining the voltages at two ends of the elastic deformation unit according to the voltage of the potential monitoring point;
determining the deformation height of the elastic deformation unit according to the voltage at the two ends of the elastic deformation unit, and determining the fingerprint shape corresponding to the elastic deformation unit according to the deformation height;
and determining the fingerprint according to the fingerprint shapes corresponding to all the elastic deformation units.
8. The fingerprint identification method according to claim 7, wherein the determining the deformation height of the elastic deformation unit according to the voltage across the elastic deformation unit comprises:
determining the current of the elastic deformation unit;
determining the resistance of the elastic deformation unit according to the voltage at the two ends of the elastic deformation unit and the current;
and determining the cross section area of the elastic deformation unit according to the resistance, and determining the deformation height of the elastic deformation unit according to the cross section area.
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