CN203930883U - Fingerprint recognition detection components and electronic installation thereof - Google Patents

Abstract

The utility model discloses a fingerprint identification and detection component and its electronic device, wherein the fingerprint identification and detection component comprises: a substrate having a first surface, a second surface corresponding to the first surface, and a connection between the first surface and the second surface Side; the flexible substrate is arranged on the first surface of the substrate, and is bent along the side of the substrate to extend to the second surface of the substrate and at least partially covers the second surface of the substrate; the touch element is arranged on On the flexible substrate, and located on the second surface of the substrate; the fingerprint detection element, arranged on the flexible substrate, and located on the first surface of the substrate; and the lead, arranged on the flexible substrate, one end of the lead The fingerprint detection element is electrically connected, and the other end extends to the second surface of the substrate. The utility model can realize fingerprint identification, and does not need to use physical buttons, but performs fingerprint identification on the transparent cover of the non-display area such as the display screen. It expands the practical application of fingerprint recognition, especially for Android phones without physical HOME keys.

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;

A flexible base material is arranged on the first surface of the substrate, and is bent along the side of the substrate to extend to the second surface of the substrate and at least partially covers the second surface of the substrate ;

a touch element disposed on the flexible substrate and located on the second surface of the substrate;

a fingerprint detection element disposed on the flexible substrate and located on the first surface of the substrate; and

Leads are arranged on the flexible substrate, one end of the leads is electrically connected to the fingerprint detection element, and the other end extends to the second surface of the substrate.

Preferably, the fingerprint detection element includes:

sensing electrodes; and

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

Preferably, the fingerprint detection element further includes a reference electrode, the reference electrode is disposed opposite to the sensing electrode and is located on a side of the sensing electrode opposite to the plurality of driving electrodes.

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

Preferably, the touch element includes at least

The second light-transmitting conductive layer is formed on the flexible substrate and includes a plurality of electrode leads arranged in parallel along the first direction;

a first substrate formed on the second light-transmitting conductive layer; and

The first light-transmitting conductive layer is formed on the first substrate and includes a plurality of electrode leads arranged in parallel along the second direction;

Wherein, the second light-transmitting conductive layer and the fingerprint detection element are located on the same layer between the first substrate and the flexible substrate.

Preferably, the fingerprint detection element extends from the first surface of the substrate along the side of the substrate to the second surface of the substrate along with the flexible substrate.

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, the fingerprint detection element and leads are formed on the flexible substrate by sputtering or silk-screen printing.

Preferably, a groove is formed in the flexible substrate, and the fingerprint detection element is arranged in the groove.

Preferably, both the first surface and the side surface of the substrate are provided with recesses for accommodating the flexible substrate.

Preferably, it also includes a fingerprint identification chip, which is arranged on the flexible substrate on the second surface of the substrate, and the fingerprint identification chip is sensitive to the coupling between the user's moving finger and the fingerprint detection element.

Preferably, a first adhesive layer is provided between the flexible substrate and the first surface of the substrate; a second adhesive layer is provided between the flexible substrate and the second surface of the substrate. layered.

Preferably, the touch element is located between the flexible substrate and the substrate.

Preferably, a protective layer is also included, covering at least the fingerprint detection element and the flexible substrate on the first surface of the substrate, and 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 used for fingerprint identification and detection in embodiment 1 of the present utility model;

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

Fig. 3 is a sectional view of the substrate in Fig. 2;

Fig. 4 is the plan view of substrate in Fig. 2;

Fig. 5 is the first circuit schematic diagram of the fingerprint detection element in the embodiment of the present invention;

Fig. 6 is the second circuit principle diagram of the fingerprint detection element in the embodiment of the present invention;

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

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

9 is a cross-sectional view during the manufacturing process of the electronic device used for fingerprint identification and detection in Embodiment 2 of the present invention; and

FIG. 10 is a cross-sectional view of the electronic device used for fingerprint recognition and detection in Embodiment 2 of the present utility model.

Wherein, the reference signs are explained as follows:

1 substrate

a first side

b second side

c side

1a, 1c concave table

2 flexible substrate

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

4 leads

5 Fingerprint identification chip

6 layers of protection

7 Filler

8 Protective base

9 Anisotropic conductive materials

10 motherboard

11 First adhesive layer

12 Second adhesive layer

13 touch elements

100 substrates

101 The first transparent adhesive layer

102 The first light-transmitting conductive layer

103 First substrate

104 Second transparent adhesive layer

105 Second light-transmitting conductive layer

106 flexible substrate

107 Second base material

108 Anisotropic conductive material

109 motherboard

110 fingerprint detection element

111 Adhesive layer

112 protective layer

30 drive circuit

31 Sensing electrodes

32 drive electrodes

33 reference electrode

34 Dummy drive electrodes

35 detection gap

36 clearance

37 Differential filter

38 Differential Amplifier

39 wires

H finger slide direction

300 drive circuit

301 Fingerprint sensing area

302 first driving electrode

303 The first sensing electrode

304 first reference electrode

305 First dummy driving electrode

306 First detection gap

307 Differential filter

308 Differential Amplifier

309 second driving electrode

310 Second sensing electrode

311 Second reference electrode

312 Second dummy driving electrode

313 Second detection gap

314 differential filter

315 Differential Amplifier

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 FIG. 1 to FIG. 4 , the fingerprint identification and detection assembly of the present invention includes a substrate 1 , a flexible substrate 2 , a fingerprint detection element 3 , leads 4 , a fingerprint identification chip 5 , a protective layer 6 and a touch element 13 .

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. In this embodiment, a concave platform 1a is formed on the first surface a of the substrate 1, the flexible base material 2 and the fingerprint detection element 3 are accommodated in the concave platform 1a, and the side c of the substrate 1 is also provided with a concave platform 1a. Recess 1c for accommodating flexible substrate 2 . The total height of the flexible substrate 2 and the fingerprint detection element 3 can match the depth of the concave platform 1a, for example, the depth of the concave platform 1a can be 50um (micrometer), but not limited thereto. In this way, the overall thickness and length of the substrate 1 after the installation of the flexible substrate 2 and the fingerprint detection element 3 are basically consistent with the original substrate 1, so as to facilitate the overall thinning of the product. Of course, recesses (not shown) may also be provided on the second surface of the substrate 1 .

The flexible substrate 2 is disposed on the first surface of the substrate 1 , bends along the side of the substrate 1 and extends to the second surface of the substrate 1 and at least partially covers the second surface of the substrate 1 . In the embodiment in which the first surface and the side surface of the substrate 1 are provided with recesses, the flexible substrate 2 is accommodated in the recesses. A first adhesive layer 11 is provided between the flexible base material 2 and the first surface of the base sheet 1 to adhere and fix the flexible base material 2 on the first surface of the base sheet 1 or in the depression on the first surface. A second adhesive layer 12 is provided between the flexible substrate 2 and the second surface of the substrate 1 . The flexible substrate 2 in this embodiment is a flexible circuit board or polyethylene terephthalate (PET, Polyethylene terephthalate), but not limited thereto.

The fingerprint detection element 3 is located on the first surface of the substrate 1 and is arranged on the flexible substrate 2 . For example, an embossing layer (not shown in the figure) is provided on the flexible substrate 2 , grooves are formed on the surface of the embossing layer, and the fingerprint detection element 3 is disposed in the groove of the flexible substrate 2 . The fingerprint detection element 3 can be formed on the flexible substrate 2 by sputtering or silk printing. 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 lead wire 4 is arranged on the flexible base material 2, and one end of the lead wire 4 is electrically connected to the fingerprint detection element 3, and the other end extends to the second surface of the substrate 1, that is, the signal of the fingerprint detection element 3 is transmitted from the first surface of the substrate 1. The face is transmitted to the fingerprint recognition chip 5 on the second face of the substrate 1. In this way, the process of punching holes and passing wires on the substrate 1 is avoided, thereby ensuring the overall strength of the substrate. The leads 4 can also be formed on the flexible substrate 2 by sputtering or silk printing.

The fingerprint identification chip 5 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 to receive and process the data transmitted from the fingerprint detection element 3 . The specific installation position of the fingerprint identification chip 5 can be connected to the flexible base material 2 on the second side of the substrate 1 by means of a flip chip, or connected to the flexible base material 2 and the fingerprint identification chip by means of bump welding. Filling glue 7 is filled between 5 and flexible base material 2; of course, the installation position of fingerprint identification chip 5 can also be integrated in the motherboard 10 that is electrically connected with lead wire 4. In order to protect the fingerprint identification chip 5 , a protective base 8 can be arranged on the fingerprint identification chip 5 to cover the fingerprint identification chip 5 .

The protective layer 6 covers the fingerprint detection element 3 and the flexible substrate 2 on the first surface of the substrate 1 , fully protecting the fingerprint detection element 3 and the flexible substrate 2 that are easy to wear. The thickness of the protective layer 6 can be 50um, but not limited thereto. The material of the protective layer 6 is Diamond Like Carbon Coating or high-transparency anti-fingerprint AF film, etc., but not limited thereto.

The touch element 13 is disposed on the flexible substrate 2 and located on the second surface of the substrate. The touch element 13 may be one of capacitive screen, resistive screen, piezoelectric touch screen, infrared touch screen, surface acoustic wave touch screen, etc., but not limited thereto. For example: the touch element 13 can be formed on the flexible substrate 2 by processes such as etching and lamination (but not limited thereto), so that the touch element 13, the fingerprint detection element 3 and the fingerprint are arranged on a piece of flexible substrate 2 The identification chip 5 enhances the integrity. Moreover, the touch element 13 can be arranged on any side of the flexible substrate 2 according to manufacturing requirements. For example: the touch element 13 is on one side of the flexible substrate 2 , and the fingerprint recognition chip 5 is on the other side of the flexible substrate 2 . In this way, the touch element 13 can be closely attached between the flexible substrate 2 and the substrate 1, so that the substrate 1, the fingerprint detection element 3, the touch element 13 and the flexible substrate 2 can become an integrated product, with a higher level of integration.

The four configurations and working principles of the fingerprint detection element will be respectively described below in conjunction with FIG. 5 , FIG. 6 , FIG. 7 and FIG. 8 .

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. 5 ). As shown in FIG. 5 , 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 of the fingerprint 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 5, 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. 6 .

Same as in FIG. 5 , the fingerprint detection element 3 ′ ( FIG. 6 ) 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' may also include a reference electrode 33 and a plurality of dummy driving electrodes 34 (see FIG. 6 ). 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. 6 , the dummy drive circuit may include substantially parallel dummy drive electrodes 34 positioned perpendicularly to the reference electrode 33 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. 7, 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. 8, 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. 7 is that the first sensing electrode and the second sensing electrode of the fingerprint detection element 300″ in FIG. 8 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, differential amplifier 308, differential filter 314, and differential amplifier 315 can also be formed (by semiconductor chip production technology) in the fingerprint detection element 300". 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. 8 can effectively eliminate noise and spurious signals on the basis of the fingerprint detection element 300 ′ in FIG. 7 , thereby obtaining a more accurate fingerprint image.

The main steps of the manufacturing method of the fingerprint recognition detection assembly of the present utility model are illustrated below with the embodiment shown in Figure 2:

A substrate 1 is provided, and a flexible substrate 2 is pasted on the first surface of the substrate 1 through a first adhesive layer 11. Leads 4 and fingerprints have been formed on the flexible substrate 2 in advance by sputtering or silk screen printing. Detect element 3, and form touch element 13 through etching, lamination and other processes; then bend flexible substrate 2 along the side of substrate 1, and then stick to the second side of substrate 1 through second adhesive layer 12 On the second side of the substrate 1, the fingerprint recognition chip 5 is welded on the flexible base material 2, so that the lead wire goes around the side of the substrate 1 from the fingerprint detection element 3 on the first side of the substrate 1 along the flexible base material 2 Connected to the fingerprint identification chip 5, the signal of the fingerprint detection element 3 is transmitted from the first surface of the substrate 1 to the fingerprint identification chip 5 on the second surface of the substrate 1, and finally the flexible substrate on the first surface of the substrate 1 The material 2 and the fingerprint detection element 3 are covered with a protective layer 6 .

Continuing to refer to FIGS. 1 and 2, according to another aspect of the present invention, there is also provided an electronic device for fingerprint recognition detection (such as a mobile phone, ipad and other portable terminals or access control devices), including the above-mentioned fingerprint recognition 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 transmitted from the first surface of the transparent cover to the transparent cover along the flexible substrate 2. the second side of the board. The touch element 13 is arranged in the display area of the second surface of the transparent cover, and the main board 10 is respectively connected with the touch element 13 and the flexible substrate 2 of the fingerprint recognition and detection assembly. The main board 10 can be connected to the flexible substrate 2 through an anisotropic conductive material (ACF) 9 . The electronic device can also include a back cover, which covers the back of the electronic device, and the back cover is provided with an annular protective wall, and the annular protective wall covers the fingerprint recognition chip 5 . 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.

Example 2

As shown in Figures 9 and 10, another structure of the fingerprint identification and detection assembly of the present invention is as follows: a first transparent adhesive layer 101, a first light-transmitting conductive layer 102, a first base Material 103, second transparent adhesive layer 104, second light-transmitting conductive layer 105, flexible base material 106, second base material 107, and between the second transparent adhesive layer 104 and flexible base material 106 is also provided with The second light-transmitting conductive layer 105 is the same layer as the fingerprint detection element 110 . The fingerprint detection element 110 and the flexible substrate 106 extend toward the direction of the non-display area of the substrate 100, beyond the fingerprint detection element 110 of the substrate 100 and the flexible substrate 106 (see FIG. 9 ), and the excess part is along the substrate 100 The side of the substrate 100 is bent from the lower surface of the substrate 100 to cover the upper surface of the substrate 100 through bending, and is fixed on the upper surface of the substrate 100 by the adhesive layer 111 (see FIG. 10 ). The first light-transmitting conductive layer 102 and the second light-transmitting conductive layer 105 can pass the leads out of the second substrate 107 by means of perforations, and are electrically connected to the second substrate through an anisotropic conductive film (ACF) 107 below the motherboard 109 . The fingerprint detection element 110 also passes the leads out of the second base material 107 by means of perforation, and is electrically connected to the main board 109 under the second base material 107 through an anisotropic conductive material. The main board 109 is integrated with a fingerprint recognition chip. A protective layer 112 is provided on the upper surface of the substrate 100 to cover and protect the flexible substrate 106 and the fingerprint detection element 110 .

Wherein, the substrate 100 may be made of glass or sapphire, but not limited thereto. The first transparent adhesive layer 101 and the second transparent adhesive layer 104 may be OCA optical adhesive (Optically Clear Adhesive), but not limited thereto.

The first light-transmitting conductive layer 102 and the second light-transmitting conductive layer 105 may be Indium Tin Oxide (ITO), which are generally located in the display area of the substrate 100 to form a touch screen structure. The first light-transmitting conductive layer 102 and the second light-transmitting conductive layer 105 respectively include a plurality of electrode leads in two different directions, (for example: the first light-transmitting conductive layer 102 is a plurality of ITO electrodes arranged at intervals in the X direction Leads, the second light-transmitting conductive layer 105 is a plurality of ITO electrode leads arranged at intervals in the Y direction, and the X direction and the Y direction are perpendicular to each other, but it is not limited to this, and other arrangements can also be used) to realize the touch screen The functions and implementation principles of related touch screens will not be repeated here.

The flexible substrate 106 can be a transparent and bendable PET material (polyethylene terephthalate), but not limited thereto. And the first base material 103 and the second base material 107 can also be PET material (polyethylene terephthalate), but not limited thereto.

The material of the protective layer 112 is Diamond Like Carbon Coating or high-transparency anti-fingerprint AF film, etc., but not limited thereto.

The difference from Embodiment 1 is that in this embodiment, the fingerprint detection element 110 under the lower surface of the substrate 100 is located on the flexible substrate 106, and after being bent to the upper surface of the substrate 100, the fingerprint detection The element 110 is located under the flexible substrate 106 .

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 (15)

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; A flexible base material is arranged on the first surface of the substrate, and is bent along the side of the substrate to extend to the second surface of the substrate and at least partially covers the second surface of the substrate ; a touch element disposed on the flexible substrate and located on the second surface of the substrate; a fingerprint detection element disposed on the flexible substrate and located on the first surface of the substrate; and Leads are arranged on the flexible substrate, one end of the leads is electrically connected to the fingerprint detection element, and the other end extends to the second surface of the substrate. 2. The fingerprint recognition detection assembly according to claim 1, wherein the fingerprint detection element comprises: sensing electrodes; and A plurality of driving electrodes, the plurality of driving electrodes are arranged side by side and spaced apart from each other, and the plurality of driving electrodes are respectively opposed to the sensing electrodes at a distance to form a plurality of detection gaps. 3. The fingerprint identification and detection assembly according to claim 2, wherein the fingerprint detection element further comprises a reference electrode, the reference electrode is arranged opposite to the sensing electrode and is located between the sensing electrode and the plurality of electrodes. The strip drives the opposite side of the electrode. 4. The fingerprint identification and detection assembly according to claim 3, wherein the fingerprint detection element further comprises a plurality of dummy drive electrodes, the plurality of dummy drive electrodes are arranged side by side and electrically connected to each other, and the plurality of dummy drive electrodes are electrically connected to each other. The driving electrodes are correspondingly arranged on the side of the reference electrode opposite to the sensing electrode corresponding to the plurality of driving electrodes. 5. The fingerprint identification and detection component according to claim 1, wherein the touch element at least comprises: The second light-transmitting conductive layer is formed on the flexible substrate and includes a plurality of electrode leads arranged in parallel along the first direction; a first substrate formed on the second light-transmitting conductive layer; and The first light-transmitting conductive layer is formed on the first substrate and includes a plurality of electrode leads arranged in parallel along the second direction; Wherein, the second light-transmitting conductive layer and the fingerprint detection element are located on the same layer between the first substrate and the flexible substrate. 6. The fingerprint identification and detection assembly according to claim 5, wherein the fingerprint detection element bends and extends from the first surface of the substrate along the side of the substrate along with the flexible substrate to the second side of the substrate. 7. 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. 8 . The fingerprint identification and detection component according to claim 1 , wherein the fingerprint detection element and the leads are formed on the flexible substrate by sputtering or silk printing. 9. The fingerprint identification and detection assembly according to claim 1, wherein a groove is formed in the flexible substrate, the fingerprint detection element is arranged in the groove, and the first of the substrate Both the surface and the side are provided with recesses for accommodating the flexible base material. 10. The fingerprint identification and detection assembly according to claim 1, further comprising a fingerprint identification chip disposed on the flexible base material on the second surface of the substrate, the fingerprint identification chip responding to the movement of the user's finger. The coupling with the fingerprint detection element is sensitive. 11. The fingerprint identification and detection assembly according to claim 1, characterized in that: a first adhesive layer is provided between the flexible substrate and the first surface of the substrate; A second adhesive layer is provided between the second surfaces of the base sheet. 12. The fingerprint identification and detection assembly according to claim 1, wherein the touch element is located between the flexible substrate and the substrate. 13. The fingerprint identification and detection assembly according to claim 1, further comprising a protective layer covering at least the flexible substrate of the first surface of the fingerprint detection element and the substrate, the protective layer Diamond-like carbon coating or high-transparency anti-fingerprint AF film. 14. 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 13. 15. The electronic device with fingerprint recognition and detection function as claimed in claim 14, characterized in that: 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.