CN203930874U - Fingerprint recognition detection components and electronic installation thereof - Google Patents

Abstract

The utility model has disclosed fingerprint recognition detection components and electronic installation thereof, and wherein, fingerprint recognition detection components comprises: substrate, has first surface, corresponding with described first surface second and connect described first surface and the side of second; Side goes between, and is arranged at the side of described substrate; Fingerprint detection element, is arranged at the first surface of described substrate; First goes between, and is arranged at the first surface of described substrate, and one end of described the first lead-in wire is electrically connected described fingerprint detection element, and the other end connects described side lead-in wire; And second lead-in wire, be arranged at second of described substrate, one end of described the second lead-in wire is electrically connected described side lead-in wire, the utility model can be realized on the electronic installations such as such as portable terminal and realize fingerprint recognition, and need to be by physical button, but carry out fingerprint recognition on the non-display area transparent cover plate as display screen, and expand the practical application of fingerprint recognition, be particularly useful for Android mobile phone not having on entity HOME key etc.

Description

Fingerprint identification detection component and its electronic device

technical field

The utility model relates to the field of fingerprint identification, in particular to a fingerprint identification detection component and an electronic device with the fingerprint identification detection component.

Background technique

With the wide application of portable terminals in people's daily life, the functions of the current portable terminals are becoming more and more powerful, and such diversified functions are convenient for users. However, while the portable terminal provides more convenience for the user, it carries too much private information. If the portable terminal is lost or stolen, the information is easily leaked because there is no relevant protection. cause inconvenience to users. Therefore, it is very necessary to do some security settings on the portable terminal.

The security function of a traditional portable terminal with a touch screen is nothing more than setting software functions such as a keyboard lock on the portable terminal, and realizing security by inputting a password. In this traditional portable terminal with a touch screen, the keyboard lock is usually protrudingly arranged on the edge side of the portable terminal in the form of a button, so the user may press the keyboard lock accidentally when grasping the portable terminal, thereby driving the portable terminal and consuming the portable terminal. power. Moreover, since the keypad lock is provided on the edge side of the portable terminal, it gives a feeling of unevenness and irregularity, which reduces the appearance quality of the portable terminal. Simultaneously, when realizing secrecy by inputting a password, it is troublesome to input the password every time, and the password is easily cracked to cause the security function to fail.

Utility model content

The object of the present utility model is to provide a fingerprint recognition detection component and an electronic device with the fingerprint recognition detection component, so as to realize fingerprint recognition on electronic devices such as portable terminals.

According to one aspect of the present utility model, a fingerprint identification detection component is provided, comprising:

a substrate having a first face, a second face corresponding to the first face, and a side face connecting the first face and the second face;

side leads, arranged on the side of the substrate;

a fingerprint detection element arranged on the first surface of the substrate;

a first lead, disposed on the first surface of the substrate, one end of the first lead is electrically connected to the fingerprint detection element, and the other end is connected to the side lead; and

a second lead, disposed on the second surface of the substrate, one end of the second lead is electrically connected to the side lead;

Wherein, the fingerprint detection element includes:

the first sensing electrode;

A plurality of first driving electrodes, the plurality of first driving electrodes are arranged side by side and spaced apart from each other, and the plurality of first driving electrodes are respectively spaced apart from the first sensing electrodes to form a plurality of first detection gaps ;

The second sensing electrode is arranged in parallel with the first sensing electrode and is located on a side of the first sensing electrode opposite to the plurality of first driving electrodes;

A plurality of second driving electrodes, the plurality of second driving electrodes are arranged side by side and spaced apart from each other, and the plurality of second driving electrodes are respectively spaced apart from the second sensing electrodes to form a plurality of second detection gaps The plurality of second driving electrodes are correspondingly arranged on the side of the second sensing electrode opposite to the first sensing electrode corresponding to the plurality of first driving electrodes.

Preferably, the fingerprint detection element further includes a first reference electrode and a second reference electrode, the first reference electrode is arranged opposite to the first sensing electrode in parallel and is located between the first sensing electrode and the plurality of electrodes. On the side opposite to the first driving electrodes, the second reference electrode is parallel to the second sensing electrodes and is located on the opposite side of the second sensing electrodes to the plurality of second driving electrodes.

Preferably, the fingerprint detection element further includes a plurality of first dummy driving electrodes and a plurality of second dummy driving electrodes, the plurality of first dummy driving electrodes are arranged side by side and electrically connected to each other, and the plurality of first dummy driving electrodes The electrodes are arranged on the opposite side of the first reference electrode to the first sensing electrode corresponding to the plurality of first driving electrodes, and the plurality of second dummy driving electrodes are arranged side by side and electrically connected to each other, so The plurality of second dummy driving electrodes are correspondingly arranged on a side of the second reference electrode opposite to the second sensing electrode corresponding to the plurality of second driving electrodes.

Preferably, the pitch between adjacent first driving electrodes and the pitch between adjacent second driving electrodes are equal to each other and in the range of 50 to 60 μm; the width of the first driving electrodes and the width of the second driving electrodes are mutually equal equal and within a range of 20 to 45 μm; the sizes of the first detection gap and the second detection gap are equal to each other and within a range of 20 to 40 μm.

Preferably, one or more grooves are provided on the side of the substrate, and the side leads are formed in the grooves.

Preferably, at least a part of the pattern formed by the sensing electrodes and the driving electrodes of the fingerprint detection element is composed of a conductive grid.

Preferably, it also includes a fingerprint recognition chip, which is arranged on the second surface of the substrate, and the fingerprint recognition chip is connected to the side lead through the second lead, and the fingerprint recognition chip is used for moving the finger of the user to the said side lead. The coupling between the fingerprint detection elements is sensitive.

Preferably, the side leads, the first leads and the second leads are respectively formed on the substrate by sputtering, vapor deposition, etching or silk printing.

Preferably, a protective layer is further included, covering at least the fingerprint detection element and the first flexible substrate.

Preferably, the protective layer is a diamond-like carbon coating or a high-transparency anti-fingerprint AF film.

According to another aspect of the present invention, there is also provided an electronic device with a fingerprint recognition and detection function, including the above-mentioned fingerprint recognition and detection component.

Preferably, the substrate is a transparent cover of a touch screen, and the fingerprint detection element is arranged in a non-display area of the touch screen.

According to the technical solution disclosed in the utility model, fingerprint recognition can be realized on electronic devices such as portable terminals, and without the need for physical buttons, fingerprint recognition is performed on the transparent cover of the non-display area such as the display screen, expanding the The practical application of fingerprint recognition is especially suitable for Android phones without physical HOME keys.

Description of drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

Fig. 1 is the electronic device for fingerprint recognition detection of the utility model embodiment;

Fig. 2 is a sectional view of the S region in Fig. 1;

Fig. 3 is the schematic diagram of the first lead on the a face of the substrate among Fig. 2;

Fig. 4 is the schematic diagram of the upper lead on the c surface of the substrate in Fig. 2;

Fig. 5 is the enlarged view of the a-plane edge groove of the substrate in Fig. 2;

Fig. 6 is the magnified view of the modification example of the a-plane edge groove of the substrate in Fig. 2;

Fig. 7 is the first circuit schematic diagram of the fingerprint detection element in the embodiment of the present invention;

Fig. 8 is the second circuit principle diagram of the fingerprint detection element in the embodiment of the present invention;

Fig. 9 is the third circuit principle diagram of the fingerprint detection element in the embodiment of the present invention; and

Fig. 10 is a schematic diagram of the fourth circuit of the fingerprint detection element in the embodiment of the present invention.

Wherein, the reference signs are explained as follows:

1 substrate

a first side

b second side

c side

2 side leads

3, 3′, 300′, 300" Fingerprint Detection Elements

4 first lead

5 Second lead

6 Fingerprint identification chip

7 layers of protection

8 Protective base

9 motherboard

10 grooves

10' groove drive circuit

30 sensing electrodes

31 drive electrode

32 reference electrode

33 Dummy drive electrodes

34 Detection gap

35 clearance

36 Differential filter

37 Differential Amplifier

38 wires

39 Finger slide direction

H drive circuit

300 fingerprint sensing area

301 First driving electrode

302 The first sensing electrode

303 first reference electrode

304 First dummy driving electrode

305 First detection gap

306 differential filter

307 Differential Amplifier

308 second driving electrode

309 Second sensing electrode

310 Second reference electrode

311 Second dummy driving electrode

312 Second detection gap

313 differential filter

314 Differential Amplifier

315

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many 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, and will fully incorporate the concepts of example embodiments. communicated to those skilled in the art. The same reference numerals denote the same or similar structures in the drawings, and thus their repeated descriptions will be omitted.

The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the invention. However, those skilled in the art should appreciate that the technical solutions of the present invention can also be practiced without one or more of the specific details, or with other methods, components, materials, etc. In some instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the invention.

The accompanying drawings of the utility model are only used to illustrate the relative positional relationship and electrical connection relationship. The layer thickness of some parts is drawn in an exaggerated way for easy understanding. The layer thickness in the drawings does not represent the proportional relationship of the actual layer thickness.

Example 1

As shown in Figures 1 to 4), the fingerprint recognition and detection assembly of the embodiment of the present invention includes a substrate 1, a side lead 2, a fingerprint detection element 3, a first lead 4, a second lead 5, a fingerprint recognition chip 6 and a protection Layer 7.

The substrate 1 has a first face a, a second face b corresponding to the first face, and a side c connecting the first face and the second face. The substrate 1 can be a transparent cover, such as tempered glass, tempered glass, polycarbonate, polycarbonate, ceramic or sapphire, etc. The substrate 1 is preferably made of high-strength material to effectively protect the underlying components.

The side leads 2 are formed on the side c of the substrate 1 by sputtering or silk printing, and the side leads 2 connect the first surface a and the second surface b of the substrate 1 . The side leads 2 play the role of transferring the data of the fingerprint identification chip 6 on the first surface a of the substrate 1 to the second surface b of the substrate 1 along the side of the substrate 1, so as to avoid further processing on the substrate 1. The process of punching through the line ensures the overall strength of the substrate.

In order to prevent the side leads 2 from wearing or falling off during use, a groove 10 can be provided on the side of the substrate 1 , the side leads are formed in the groove 10 , and the side leads 2 are protected by the groove 10 . The structure of the groove is introduced by way of example through Fig. 5 and Fig. 6 .

As shown in FIG. 5 , a rectangular groove 10 is formed at the position of the central axis of the side surface of the substrate 1 . The shape of the groove 10 can be varied, and is not limited thereto. The depth of the groove 10 may be greater than the thickness of the side lead 2 . The side leads 2 are all arranged in the groove 10 (there is a gap between the side leads 2 to ensure insulation), the groove 10 can effectively protect the side leads 2, prevent the side leads 2 from being scratched or worn, and reduce the overall product defect Rate.

As shown in FIG. 6 , in a variation example, multiple grooves 10 ′ can also be provided on the side of the substrate 1 , and each groove 10 ′ is an independent through groove corresponding to a single side lead 2 . Each side lead 2 is arranged in a through groove, and the depth of the through groove may be greater than the thickness of the side lead 2 . This structure makes the side leads 2 completely non-contact and insulated from each other. This structure can effectively prevent the short circuit problem between the side leads 2 on the basis of the structure in FIG. 5 .

The fingerprint detection element 3 and the first lead 4 are formed on the first surface a of the substrate 1 by sputtering or silk printing. One end of the first lead 4 is connected to the fingerprint detection element 3 and the other end is connected to the first end of the side lead 2 . The second lead 5 is formed on the second surface b of the substrate 1 by sputtering or silk printing, and the second lead 5 is connected to the second end of the side lead 2 . Therefore, through the first lead 4, the side lead 2 and the second lead 5, the signal of the fingerprint detection element 3 on the first surface a of the substrate 1 can be transmitted to the second surface b of the substrate 1 via the side surface of the substrate 1. . The utility model makes the fingerprint detection element 3 on the upper surface of the substrate 1 in order to make the fingerprint detection element 3 closer to the user's fingerprint, and greatly reduce the distance between the electrodes in the fingerprint detection element 3 and the user's fingerprint. The specific configuration and working principle of the fingerprint detection element 3 will be described in detail later.

The fingerprint identification chip 6 is generally located on the second surface of the substrate 1 to be sensitive to the coupling between the user's moving finger and the fingerprint detection element 3 . The specific installation position of the fingerprint identification chip 6 can be connected to the second side b of the substrate 1 by means of a flip chip, and the fingerprint identification chip 6 is connected to the second lead 5 to receive and process the incoming signal from the fingerprint detection element 3. The data.

Certainly, the installation position of the fingerprint identification chip 6 can also be integrated in the main board 9 electrically connected with the second lead 5 . In order to protect the fingerprint identification chip 6 , a protective base 7 can be arranged on the fingerprint identification chip 6 to cover the fingerprint identification chip 6 .

The protective layer 7 covers the fingerprint detection element 3 and the first lead 4 . The thickness of the protective layer 7 may be 50 μm, but not limited thereto. The material of the protective layer 7 is Diamond Like Carbon Coating or high-transparency anti-fingerprint AF film, etc., but not limited thereto.

The four configurations and working principles of the fingerprint detection element will be described below in conjunction with FIG. 7 , FIG. 8 , FIG. 9 and FIG. 10 respectively.

At least a part of the electrode wiring pattern in the fingerprint detection element 3 is constituted by a conductive mesh. The fingerprint detection element 3 includes a sensing electrode 31 and a plurality of driving electrodes 32 (see FIG. 7 ). As shown in FIG. 7 , the fingerprint detection element 3 includes a plurality of driving electrodes 32 and sensing electrodes 31 . A plurality of driving electrodes 32 are arranged side by side and spaced apart from each other, and the plurality of driving electrodes 32 are spaced apart from each other and opposite to the sensing electrodes 31 to form a plurality of detection gaps 35 . The driving electrodes 32 are substantially parallel to each other and are connected to the driving circuit 30 . The sensing electrodes 31 are substantially arranged perpendicular to the driving electrodes 32 . Each driving electrode 32 is separated from the sensing electrode 31 by a detection gap 35 . Therefore, the fingerprint detection element 3 includes detection gaps 35 arranged linearly between each driving electrode 32 and sensing electrode 31 .

When the user moves or swipes a finger in a direction perpendicular to the sensing electrodes 31 (for example, sliding the finger along the H direction), the driving circuit 30 sequentially excites the driving electrodes 32 with a driving signal. When the fingerprint ridges and valleys of the fingerprint pass over the detection gap 35 , the driving signal applied to the driving electrode 32 is capacitively coupled to the sensing electrode 31 according to the capacitance of a single detection gap 35 . The capacitance varies according to the fingerprint ridges and fingerprint valleys across the detection gap 35 . The capacitively coupled driving signal is coupled to the sensing electrode 31 and detected by a sensing circuit to provide a row of fingerprint images. A complete fingerprint image can be formed by combining multiple pieces of fingerprint graphics.

A fingerprint detection element 3 of the type shown in Figure 7, while providing satisfactory performance, is susceptible to parasitic coupling and noise collected by the human body and interference coupled through the main part of the finger from the ridges outside the gap . In order to optimize the accuracy of fingerprint recognition and eliminate coupling interference from the ridges outside the gap, that is, to eliminate differential noise, an improved fingerprint detection element 3' is shown in FIG. 8 .

Same as in FIG. 7 , the fingerprint detection element 3 ′ ( FIG. 8 ) includes a plurality of driving electrodes 32 and sensing electrodes 31 . The driving electrodes 32 are substantially parallel to each other and are connected to the driving circuit 30 . The sensing electrodes 31 are substantially arranged perpendicular to the driving electrodes 32 . Each drive electrode 32 is spaced apart from the detection plate by a detection gap 35 . Therefore, the fingerprint detection element 3 ′ includes detection gaps 35 arranged linearly between each driving electrode 32 and sensing electrode 31 . The drive circuit 30 sequentially energizes the drive electrodes 32 with drive signals.

The fingerprint detection element 3' can also include a reference electrode 33 and a plurality of dummy driving electrodes 34 (see FIG. 8 ). A plurality of dummy driving electrodes 34 are arranged side by side and electrically connected to each other. The plurality of dummy driving electrodes 34 and the plurality of driving electrodes 32 are arranged on the opposite side of the reference electrode 33 to the sensing electrode 31 .

The fingerprint detection element 3 ′ also includes a reference electrode 33 which may be substantially parallel to the sensing electrode 31 and separated from the sensing electrode 31 . The reference electrode 33 is located on a side of the sensing electrode 31 opposite to the driving electrode 32 and is thus separated from the driving electrode 32 by a greater distance than the sensing electrode 31 . Reference electrode 33 should be spaced from drive electrode 32 by a distance sufficient to provide a noise and parasitic coupling reference for common mode noise cancellation. In some embodiments, the reference electrode 33 and the sensing electrode 31 may have equal length and width, and may be arranged side by side in parallel. The reference electrode 33 senses the ridge/valley signal similarly to the sense electrode 31 , but at substantially reduced strength. Because the reference electrode 33 and the sensing electrode 31 are closely spaced and have similar dimensions, the two electrodes generate approximately equal noise and spurious signals. Subtracting the signal on the sensing electrode 31 from the signal on the reference electrode 33 produces a ridge/valley signal that is proportional to the difference between the sensed signals, due to the relative spacing from the two electrodes on the detection gap 35. is significant. However, equally coupled noise and spurious signals can be removed by subtracting the signals on the two electrodes.

The sensing electrode 31 and the reference electrode 33 are coupled to a differential amplifier 38 through a differential filter 37 . In particular, the sensing electrode 31 can be coupled to the positive input of the differential amplifier 38 through the differential filter 37 , and the reference electrode 33 can be coupled to the negative input of the differential amplifier 38 through the differential filter 37 . The differential amplifier 38 electronically subtracts the signals on the sensing electrode 31 and the reference electrode 33 so that noise and spurious signals are eliminated.

The fingerprint detection element 3 ′ may also include a dummy drive circuit spaced apart from the reference electrode 33 . As shown in FIG. 8 , the dummy drive circuit may include substantially parallel dummy drive electrodes 34 positioned perpendicularly to and separated from the reference electrode 33 by a gap 36 . The parallel dummy driving electrodes 34 are electrically connected to each other by wires 39 , and are connected to the driving circuit 30 through the wires 39 . In some embodiments, the arrangement of parallel dummy drive electrodes 34 relative to reference electrodes 33 matches the arrangement of drive electrodes 32 relative to sense electrodes 31 . Therefore, the width of the parallel dummy driving electrodes 34 , the spacing between the parallel dummy driving electrodes 34 , and the size of the gap 36 may be the same as the width of the driving electrodes 32 , the spacing between the driving electrodes 32 , and the size of the detection gap 35 .

The dummy drive circuit may be connected to a reference potential, such as ground, during fingerprint image sensing. Thus, at any instant of time in fingerprint image sensing, one of the drive electrodes 32 may be excited by the drive signal, and the remaining drive electrodes 32 coupled to a reference potential, such as ground. For the example of the fingerprint detection element 3' having 300 drive electrodes 32, at any given moment, all but one of the 300 drive electrodes 32 are connected to ground, and at any given time during image sensing At this moment, all parallel dummy drive electrodes 34 of the dummy drive circuit are connected to ground. With this arrangement, noise on the ground conductor is coupled to the sensing electrode 31 and the reference electrode 33 substantially equivalently. Coupled noise is subtracted by differential amplifier 38 and thus canceled. The fingerprint image signal of interest is detected between the sensing electrode 31 and the reference electrode 33 and is not eliminated by the differential amplifier 38 . In this embodiment, the sensing electrodes 31 , the driving electrodes 32 , the reference electrodes 33 and the dummy driving electrodes 34 can all be formed by conventional deposition, etching and photolithography techniques.

Typically, the size of the detection gap 35 is smaller than the ridge pitch of a typical fingerprint, and is typically in the range of 25 to 50 μm. In this embodiment, the pitches between adjacent drive electrodes 32 are equal to each other and within a range of 50 to 60 μm, the widths of drive electrodes 32 are equal to each other and within a range of 20 to 45 μm, and the sizes of detection gaps 35 are equal to each other and within a range of 20 to 45 μm. 20 to 40μm range.

In one example of the fingerprint detection element 3', the driving electrodes 32 have a width of 25 μm (micrometer), and the pitch between adjacent driving electrodes 32 is 25 μm. The detection gap 35 has a size of 32 μm. The distance between the sensing electrode 31 and the reference electrode 33 is 32 μm. The width of the parallel dummy driving electrodes 34 of the dummy driving circuit is 25 μm and the distance between adjacent dummy driving electrodes 34 is 25 μm. The size of the gap 36 is 32 μm. The process size parameters here are given as examples only, and do not limit the scope of the present invention.

Referring to FIG. 9, the fingerprint detection element 300' may include a fingerprint sensing area 301 to sense a fingerprint swiped thereon. For different applications, the size and shape of the fingerprint sensing area 301 can be changed as needed.

In some embodiments, the fingerprint sensing area 301 may include a first sensing electrode 303 , a plurality of first driving electrodes 302 corresponding to the first sensing electrode 303 , a second sensing electrode 310 , and a plurality of first driving electrodes 302 corresponding to the second sensing electrode 310 . A plurality of second driving electrodes 309 . The first driving electrodes 302 are arranged side by side and spaced apart from each other, and the first driving electrodes 302 are spaced apart from and opposite to the first sensing electrodes 303 to form a plurality of first detection gaps 306 . The second sensing electrodes 310 are arranged parallel to the first sensing electrodes 303 and are located on a side of the first sensing electrodes 303 opposite to the plurality of first driving electrodes 302 . The second driving electrodes 309 are arranged side by side and spaced apart from each other, and the second driving electrodes 309 are spaced apart from each other and opposite to the second sensing electrodes 310 to form a plurality of second detection gaps 313 . The second driving electrodes 309 are disposed on the opposite side of the second sensing electrodes 310 to the first sensing electrodes 303 corresponding to the plurality of first driving electrodes 302 .

In this embodiment, the pitch between adjacent first driving electrodes 302 and the pitch between adjacent second driving electrodes 309 are equal to each other and within a range of 50 to 60 μm, but not limited thereto. The width of the first driving electrode 302 and the width of the second driving electrode 309 are equal to each other and within a range of 20 to 45 μm, but not limited thereto. Sizes of the first detection gap 306 and the second detection gap 313 are equal to each other and within a range of 20 to 40 μm, but not limited thereto.

The fingerprint image can pass through the first detection gap 306 between the first driving electrode 302 and the first sensing electrode 303 and the second detection gap 313 between the second driving electrode 309 and the second sensing electrode 310 when the finger sweeps And produced. These signals can be combined to form a fingerprint image, similar to how a fax image is produced using progressive scanning.

In some embodiments, the first driving electrodes 302 are configured to sequentially transmit detection signals one by one. The detection signal can be sensed on the first sensing electrode 303 . Similar to the first driving electrode 302 , the first sensing electrode 303 can be a conductive electrode connected to the driving circuit 300 .

At the first sensing electrode 303 , a response signal can be generated in response to the detection signal. The magnitude of the response signal may depend on multiple factors, such as whether there is a finger on the fingerprint sensing area 301, especially whether there is a fingerprint on the first detection gap 306 between a certain first driving electrode 302 and the first sensing electrode 303 ridges or valleys. The magnitude of the response signal generated at the first sensing electrode 303 can be directly related to the RF impedance of the ridge or valley of the finger on the first detection gap 306 between the first driving electrode 302 and the first sensing electrode 303 .

The fingerprint sensing area 301 (including the first driving electrode 302 and the first sensing electrode 303 ) may be electrically connected to the driving circuit 300 but physically separated. Locating the first sensing electrode 303 and the second sensing electrode 310 outside the silicon chip may reduce the possibility of electrostatic discharge, wear and chipping of the sensor, thereby improving the reliability of the fingerprint detection element 300'. In this way, the cost of the fingerprint detection element 300' can be reduced over time according to the traditional chip shrinking roadmap. This architecture has a distinct advantage over direct-contact sensors (sensors integrated on a silicon chip), because direct-contact sensors cannot be shrunk smaller than the width of an industry-standard fingerprint.

In this embodiment, a dual-line imager is formed by sharing the first driving electrode 302 , the second driving electrode 309 , the first sensing electrode 303 and the second sensing electrode 310 for generating accurate non-deformed fingerprint images. The direction in which the finger sweeps across the fingerprint sensing area 301 is determined by first passing the finger through the first sensing electrode 303 or the second sensing electrode 310 , and by comparing the signal changes of the first sensing electrode 303 and the second sensing electrode 310 Determine the speed of the finger when it sweeps the fingerprint sensing area 301 (for example: obtain the finger speed by calculating the time difference between the same fingerprint area passing through the first sensing electrode 303 and the second sensing electrode 310), so as to obtain a more accurate fingerprint image .

Referring to FIG. 10, the fingerprint detection element 300" may include a fingerprint sensing area 301 to sense a fingerprint swept thereon. For different applications, the size and shape of the fingerprint sensing area 301 may vary as required. Fingerprint sensing The area 301 may include a first sensing electrode 303, a plurality of first driving electrodes 302 corresponding to the first sensing electrode 303, a second sensing electrode 310, and a plurality of second driving electrodes 309 corresponding to the second sensing electrode 310. The first The driving electrodes 302 and the second driving electrodes 309 are respectively connected to the driving circuit 300. The first driving electrodes 302 are arranged side by side and spaced apart from each other, and the first driving electrodes 302 are spaced apart from the first sensing electrodes 303 to form a plurality of first Detection gap 306. The second sensing electrode 310 is arranged parallel to the first sensing electrode 303 and is located on the opposite side of the first sensing electrode 303 to the plurality of first driving electrodes 302. The second driving electrodes 309 are arranged side by side and spaced apart from each other, And the second driving electrodes 309 are respectively spaced apart from the second sensing electrodes 310 to form a plurality of second detection gaps 313. The second driving electrodes 309 are arranged between the second sensing electrodes 310 and the plurality of first driving electrodes 302 correspondingly. The side opposite to the first sensing electrode 303 .

What is different from FIG. 9 is that the first sensing electrode and the second sensing electrode of the fingerprint detection element 300 ″ in FIG. 10 are provided with corresponding reference electrodes, dummy driving electrodes, differential filters and differential amplifiers.

The first reference electrode 304 is arranged opposite to the first sensing electrode 303 in parallel and is located on a side of the first sensing electrode 303 opposite to the plurality of first driving electrodes 302 . Likewise, the second reference electrode 311 is disposed parallel to the second sensing electrode 310 and is located on a side of the second sensing electrode 310 opposite to the plurality of second driving electrodes 309 .

The fingerprint detection element 300" includes a plurality of first dummy driving electrodes 305 and a plurality of second dummy driving electrodes 312, the plurality of first dummy driving electrodes 305 are arranged side by side and are electrically connected to each other, and the plurality of first dummy driving electrodes 305 are connected to the plurality of dummy driving electrodes 305. The first driving electrodes 302 are correspondingly arranged on the opposite side of the first reference electrode 304 to the first sensing electrode 303, and a plurality of second dummy driving electrodes 312 are arranged side by side and electrically connected to each other. A plurality of second driving electrodes 309 are correspondingly arranged on the opposite side of the second reference electrode 311 to the second sensing electrode 310. In this embodiment, the first dummy driving electrodes 305 and the second dummy driving electrodes 312 can be all grounded , but not limited thereto. The fingerprint detection element 300″ also includes a differential filter 307, a differential amplifier 308, a differential filter 314, and a differential amplifier 315. In one embodiment, the differential filter 307, the differential amplifier 308, the differential filter 314 and the differential amplifier 315 can also be formed in the fingerprint detection element 300" (by semiconductor chip production technology). The first sensing electrode 303 and the first The reference electrode 304 is respectively connected to the forward input terminal and the reverse input terminal of the differential amplifier 308 through the differential filter 307, and the differential amplifier 307 electronically subtracts the signals on the first sensing electrode 303 and the first reference electrode 304, so that the noise and spurious signals are eliminated. Similarly, the second sensing electrode 310 and the second reference electrode 311 are respectively connected to the forward input terminal and the reverse input terminal of the differential amplifier 315 through the differential filter 314. The differential amplifier 315 electronically subtracts Signals on the second sensing electrode 310 and the second reference electrode 311 , so that noise and spurious signals are eliminated.

It can be seen that the fingerprint detection element 300 ″ in FIG. 10 can effectively eliminate noise and spurious signals on the basis of the fingerprint detection element 300 ′ in FIG. 9 , thereby obtaining a more accurate fingerprint image.

The main steps of the manufacturing method of the fingerprint recognition and detection assembly of the present invention are illustrated below with the embodiments shown in Figures 1 to 4:

Several substrates 1 are provided, stacked neatly together, and then side leads 2 are formed on the sides of these substrates 1 by sputtering or silk screen printing, and then the first surface a of each substrate 1 is sputtered or The first lead 4 and the fingerprint detection element 3 are formed by silk screen printing, and the first lead 4 is connected to the fingerprint detection element 3; then the second lead 5 is formed on the second surface b of the substrate 1 by sputtering or silk screen printing, so that the side leads 2 respectively connect the first lead 4 and the second lead 5; , side leads 2 and the second lead 5) can be connected to the fingerprint identification chip 6 from the fingerprint detection element 3 on the first side of the substrate 1 around the side of the substrate 1, and the signal of the fingerprint detection element 3 is transmitted from the first side of the substrate 1 One side is transferred to the fingerprint identification chip 6 on the second side of the substrate 1 , and finally the fingerprint detection element 3 and the first lead 4 on the first side a of the substrate 1 are covered with a protective layer 7 .

In a variation, grooves can be formed on the sides of the stacked substrates 1 (as shown in Figure 5 or 6, for example, the grooves can be etched by an etching process), and then sputtering, evaporation, printing, etc. The process forms the conductive material into the groove, and then performs the subsequent process. As before, the groove has the advantages of protecting the conductive material in the groove from falling off due to external force, and reducing the defective rate.

In another variation example, (A) etching the fingerprint detection element 3 and the first lead 4 on the first surface a of the substrate 1, (B) sputtering or silk-screening the lead 2 on the stacked substrate 1 and ( C) Etching the second lead 14 on the second surface b of the substrate 1, the order of these three steps can be changed arbitrarily, and the fingerprint identification and detection assembly of the present utility model can be manufactured.

Continuing to refer to FIGS. 1 to 4 , according to another aspect of the present invention, an electronic device (such as a mobile phone, ipad and other portable terminals or access control devices) for fingerprint identification and detection is provided, including the above-mentioned fingerprint identification and detection component. The substrate 1 is a transparent cover of the touch screen, and the fingerprint detection element 3 is arranged in the non-display area of the touch screen. The signal of the fingerprint detection element 3 is passed along the first lead 4, the side lead 2 and the The second lead 5 is transmitted to the second surface of the transparent cover. The touch screen component (not shown in the figure) is arranged in the display area of the second surface of the transparent cover plate, and the main board 9 is respectively connected to the touch screen component and the second lead wire 5 of the fingerprint identification detection component. The electronic device can also include a rear cover, which covers the back of the electronic device, and the rear cover is provided with an annular protective wall, and the annular protective wall covers the fingerprint recognition chip 6 . The electronic device can carry out fingerprint identification on the transparent cover of the display screen, and the implementation principle is the same as before, so it will not be repeated here.

In summary, the fingerprint identification detection component and its electronic device of the present invention can realize fingerprint identification on electronic devices such as portable terminals, and do not need to use physical buttons, but perform fingerprint identification on a transparent cover such as a display screen. Identification, which expands the practical application of fingerprint identification, especially for Android phones without physical HOME keys.

Exemplary embodiments of the present utility model have been specifically shown and described above. It should be understood that the invention is not limited to the disclosed embodiments, but on the contrary, the invention is intended to cover various modifications and equivalents included within the scope of the appended claims.

Claims (12)

1. A fingerprint recognition detection assembly, characterized in that, comprising: a substrate having a first face, a second face corresponding to the first face, and a side face connecting the first face and the second face; side leads, arranged on the side of the substrate; a fingerprint detection element arranged on the first surface of the substrate; a first lead, disposed on the first surface of the substrate, one end of the first lead is electrically connected to the fingerprint detection element, and the other end is connected to the side lead; and a second lead, disposed on the second surface of the substrate, one end of the second lead is electrically connected to the side lead; Wherein, the fingerprint detection element includes: the first sensing electrode; A plurality of first driving electrodes, the plurality of first driving electrodes are arranged side by side and spaced apart from each other, and the plurality of first driving electrodes are respectively spaced apart from the first sensing electrodes to form a plurality of first detection gaps ; The second sensing electrode is arranged in parallel with the first sensing electrode and is located on a side of the first sensing electrode opposite to the plurality of first driving electrodes; A plurality of second driving electrodes, the plurality of second driving electrodes are arranged side by side and spaced apart from each other, and the plurality of second driving electrodes are respectively spaced apart from the second sensing electrodes to form a plurality of second detection gaps The plurality of second driving electrodes are correspondingly arranged on the side of the second sensing electrode opposite to the first sensing electrode corresponding to the plurality of first driving electrodes. 2. The fingerprint identification and detection assembly according to claim 1, wherein the fingerprint detection element further comprises a first reference electrode and a second reference electrode, and the first reference electrode is parallel to the first sensing electrode The second reference electrode is opposite to and located on the side of the first sensing electrode opposite to the plurality of first driving electrodes, and the second reference electrode is parallel to the second sensing electrode and is located on the second sensing electrode. The side opposite to the plurality of second driving electrodes. 3. The fingerprint identification and detection assembly according to claim 2, wherein the fingerprint detection element further comprises a plurality of first dummy driving electrodes and a plurality of second dummy driving electrodes, and the plurality of first dummy driving electrodes Arranged side by side and electrically connected to each other, the plurality of first dummy driving electrodes are arranged on the opposite side of the first reference electrode to the first sensing electrode corresponding to the plurality of first driving electrodes, the A plurality of second dummy driving electrodes are arranged side by side and electrically connected to each other, and the plurality of second dummy driving electrodes are correspondingly arranged on the second reference electrode and the second sensing electrode corresponding to the plurality of second driving electrodes. the opposite side. 4. The fingerprint identification detection component according to claim 1, characterized in that: the pitch between adjacent first driving electrodes and the pitch between adjacent second driving electrodes are equal to each other and within the range of 50 to 60 μm ; The width of the first driving electrode and the width of the second driving electrode are equal to each other and in the range of 20 to 45 μm; the size of the first detection gap and the second detection gap are equal to each other and in the range of 20 to 40 μm. 5. The fingerprint identification and detection assembly according to claim 1, wherein one or more grooves are provided on the side of the substrate, and the side leads are formed in the grooves. 6. The fingerprint identification and detection assembly according to claim 1, wherein at least a part of the pattern formed by the sensing electrodes and the driving electrodes of the fingerprint detection element is composed of a conductive grid. 7. The fingerprint recognition detection component according to claim 1, further comprising a fingerprint recognition chip disposed on the second surface of the substrate, the fingerprint recognition chip connected to the The side lead, the fingerprint identification chip is sensitive to the coupling between the user's moving finger and the fingerprint detection element. 8. The fingerprint identification and detection component according to claim 1, wherein the side lead, the first lead and the second lead are respectively formed on the substrate by sputtering, vapor deposition, etching or silk screen printing. 9. The fingerprint identification detection component according to claim 1, further comprising a protective layer covering at least the fingerprint detection element and the first flexible substrate. 10. The fingerprint identification and detection component according to claim 9, wherein the protective layer is a diamond-like carbon coating or a high-transparency anti-fingerprint AF film. 11. An electronic device with a fingerprint recognition and detection function, comprising the fingerprint recognition and detection component according to any one of claims 1 to 10. 12. The electronic device with fingerprint recognition and detection function as claimed in claim 11, wherein the substrate is a transparent cover of a touch screen, and the fingerprint detection element is arranged on a non-display surface of the touch screen. district.