CN105046239B - Fingerprint identification device and its terminal device - Google Patents

Abstract

The present invention provides a kind of fingerprint identification device and its terminal devices.The device includes：Circuit board；Substrate is formed in the upper surface of circuit board, and and circuit board electrical connection；Fingerprint Identification sensor is formed in the upper surface of the separate circuit board of substrate, is electrically connected with substrate；Light source module is formed in the upper surface of the separate circuit board of substrate, is electrically connected with substrate；Light source sensing module is formed in the upper surface of the separate circuit board of substrate, is electrically connected with substrate；Control module is formed in the upper surface of the separate circuit board of substrate, is electrically connected with substrate；Bezel ring, has top opening, is formed in the upper surface of circuit board, constitutes an encapsulated space with circuit board, substrate, fingerprint Identification sensor, light source module, light source sensing module and control module are placed in wherein by encapsulated space；And molding layer, it is filled in encapsulated space.

Description

Fingerprint identification device and its terminal equipment

technical field

The invention relates to the technical field of biological feature identification, in particular to a fingerprint identification device with a living body detection function and a terminal device thereof.

Background technique

Biometric identification technology is the use of human physiological or behavioral characteristics to identify individuals. At present, the physiological characteristics that have been used for biometric identification include hand shape, fingerprint, face shape, iris, retina, pulse, auricle, etc. Among them, fingerprints are the most reliable physiological characteristics, so fingerprint recognition technology is the most widely used.

However, by extracting residual fingerprints, and then using a fingerprint cover made of gelatin, silica gel or rubber, which is consistent with the pattern of the extracted fingerprint, and wearing the fingerprint cover on the finger or a fake finger, the extracted fingerprint can be forged and deceived. through the fingerprint recognition device. This poses a great hidden danger to the security of fingerprint identification applications.

Contents of the invention

In view of this, the present invention provides a packaging structure of a fingerprint recognition device with a living body detection function and a terminal device including the same. On the one hand, the fingerprint identification device and the terminal equipment containing it can judge whether the object to be detected is a living body through the living body detection function; middle.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

One aspect of the present invention provides a fingerprint recognition device, including: a circuit board; a substrate formed on the upper surface of the circuit board and electrically connected to the circuit board; a fingerprint recognition sensor formed on the substrate away from the The upper surface of the circuit board is electrically connected to the substrate; the light source module is formed on the upper surface of the substrate away from the circuit board, is electrically connected to the substrate, and is used to emit light signals; the light source sensing module, Formed on the upper surface of the substrate far away from the circuit board, electrically connected to the substrate, used to sense and receive the reflected light signal after the light signal emitted by the light source module is reflected by the object to be detected, and transmit the The reflected light signal is converted into an electrical signal, so as to determine whether the object to be detected is a living body according to the electrical signal; the control module is formed on the upper surface of the substrate far away from the circuit board, and is electrically connected to the substrate , used to control the light source module to emit the optical signal; the cover ring has a top opening, formed on the upper surface of the circuit board, and forms a package space with the circuit board, and the package space includes the substrate, The fingerprint recognition sensor, the light source module, the light source sensing module and the control module are accommodated therein; and a molding layer is filled in the packaging space.

In one embodiment, the light source module includes: red LEDs, infrared LEDs and green LEDs.

In another embodiment, the control module controls all of the red LEDs, the infrared LEDs and the green LEDs to be turned on, partially turned on or completely turned off.

In yet another embodiment, the control module is an MCU controller.

In yet another embodiment, the cover ring is made of metal or plastic material.

In yet another embodiment, the fingerprint recognition sensor includes a welding pad; the welding pad is disposed on the upper surface of the fingerprint recognition sensor, and is electrically connected to the substrate through a metal wire.

In yet another embodiment, the metal wires include at least one of gold wires, aluminum wires, copper wires, aluminum-magnesium-silicon alloy wires, and aluminum-copper alloy wires.

In yet another embodiment, the substrate is electrically connected to the circuit board through a solder layer or metal solder balls.

In yet another embodiment, a connector is formed on the lower surface of the circuit board for connecting with an external circuit through the connector.

Another aspect of the present invention provides a terminal device, including any one of the above-mentioned fingerprint identification devices.

The fingerprint identification device provided by the present invention uses the control module to control the light emitting mode of the light source module to detect the living body information of the object to be detected, and then judge whether it is a living body, and after confirming that it is a living body, perform subsequent fingerprint recognition operations, eliminating the inconvenience There are potential safety hazards in fingerprint identification technology using prosthetic fingers for fingerprint identification; in addition, its packaging structure utilizes SIP packaging technology to integrate fingerprint identification sensors, control modules, light source modules and light source sensing modules on the substrate, reducing the size of fingerprint identification. The size of the device realizes miniaturization, which can be used in smaller handheld terminal equipment.

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 a plan view of a fingerprint recognition device according to an example embodiment.

Fig. 2 is a cross-sectional view of a packaging structure of a fingerprint identification device according to an example embodiment.

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 convey the concept of example embodiments 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 will appreciate that the technical solutions of the present invention may be practiced without one or more of the specific details, or with other methods, components, materials, and the like. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the invention.

For the convenience of description, those skilled in the art should understand that the upper and lower relationships of relative components in the figures described herein refer to the relative positions of objects, rather than limiting the present invention. Therefore, the components that appear the same through turning over should all belong to the scope of protection claimed by the present invention.

Fig. 1 is a plan view of a fingerprint recognition device according to an example embodiment. As shown in FIG. 1 , the fingerprint identification device 1 of the present invention includes: a substrate 11 , a fingerprint identification sensor 12 , a control module 13 , a light source module 14 and a light source sensing module 15 .

Wherein, the fingerprint identification sensor 12 is used to identify the fingerprint information of the object to be detected. The fingerprint identification sensor 12 can be, for example, an existing capacitive fingerprint identification sensor such as a pressing type, a scratching type, etc., and the present invention is not limited thereto.

The light source module 14 is used to provide a light source and emit light signals. In some embodiments, the light source module 14 may include, for example, a red LED chip 141 , an infrared LED chip 142 and a green LED chip 143 . However, the present invention is not limited thereto, and the light source module 14 may also be other existing light-emitting components.

The light source sensing module 15 is used to sense and receive the light signal emitted by the light source module 14 when it encounters the finger of the object to be detected and is reflected back, and converts the light signal into an electrical signal, and then according to the corresponding algorithm Calculate the user's vital information of the object to be detected, such as the pulse signal of the user, and then determine whether the object to be detected is alive.

The control module 13 is used to control the light source module 14 . In some embodiments, the control module 13 is, for example, an MCU (Microcontroller Unit, micro control unit) control chip. In addition to the general functions of the MCU control chip, the control module 13 also has the functions of controlling the red light LED chip 141, the infrared LED chip 141 and the infrared light in the light source module 14. The functions of the light LED chip 142 and the green LED chip 143 are, for example, turning on only one LED chip, or turning on two of the LED chips, or turning on or off all the LED chips. By controlling the lighting methods of different LED chips, a higher signal-to-noise ratio (SNR) can be achieved.

The following briefly introduces how the fingerprint recognition device of the present invention judges that the object to be detected is a living body before performing fingerprint recognition. The blood of the human body has the characteristics of reflecting red light and absorbing green light. When the heart beats, the blood flowing through the wrist of the human body will increase, the reflected red light and infrared light will increase, and the absorbed green light will also increase; during the interval between heart beats, The blood flowing through the wrist will be reduced, the reflected red light and infrared light will be reduced, and the absorbed green light will be reduced accordingly. Therefore, the pulse of the human body can be detected by detecting the reflected red light, infrared light or absorbed green light, so as to judge whether it is a living body.

And when only green light is used as the emission light source, the total amount of light emitted is relatively small, and only a small amount of light may be reflected to the light source sensing module 15 after being absorbed by the blood. Module 15 obtains fewer reflected signals. Use the control module 13 to simultaneously control the lighting of the green LED chip 143 and the red LED chip 141, or simultaneously control the lighting of the green LED chip 143 and the infrared LED chip 142, or simultaneously control the lighting of three LED chips as the emission light source , the total amount of emitted light can be increased, so the total amount of light reflected to the light source sensing module 15 is still relatively large, so that the judgment result has a higher signal-to-noise ratio.

In addition, the fingerprint recognition device provided by the present invention first judges whether the object to be detected is a living body, and only when the object to be detected is judged to be a living body, the fingerprint recognition sensor 12 is activated to continue subsequent fingerprint recognition operations. It should be noted that the arrangement of the above devices/chips is only an example, rather than limiting the present invention. In practical application, the arrangement of each device/chip can be placed arbitrarily as required.

Fig. 2 is a cross-sectional view of a packaging structure of a fingerprint identification device according to an example embodiment. As shown in FIG. 2 , the fingerprint recognition device 1 shown in FIG. 1 is packaged into a package structure 2 through a SIP (System In a Package, System In Package) package. It should be noted that, due to shading, the control module 13 and the light source module 14 behind the light source sensing module 15 are not shown in FIG. 2 .

Referring to FIG. 1 and FIG. 2 at the same time, the packaging structure 2 of the fingerprint recognition device 1 includes: a substrate 11 , a fingerprint recognition sensor 12 , a control module 13 , a light source module 14 , a light source sensing module 15 , a cover ring 26 and a molding layer 27 .

On the upper surface of the substrate 11, an interface on the substrate (such as a circuit pattern on the substrate) is formed, and the fingerprint recognition sensor 12, the control module 13, the light source module 14 and the light source sensing module 15 are respectively arranged on the upper surface of the substrate 11, and are connected by, for example, Adhesives 111 such as thermosetting glue (DAF glue) or PSA glue are pasted on the substrate 11 to realize the mechanical connection between each device and the substrate 11 . In addition, the fingerprint recognition sensor 12 , the control module 13 , the light source module 14 and the light source sensing module 15 are electrically connected to the upper interface of the substrate 11 through the metal wires 112 and respective pads 121 , 131 , 144 and 151 . Pads 121, 131, 144, and 151 may be disposed on the upper surface of each device. The metal wire 112 is, for example, at least one of gold wire, aluminum wire, copper wire, aluminum-magnesium-silicon alloy wire, and aluminum-copper alloy wire.

On the lower surface of the substrate 11, a substrate lower interface is formed, and the electrical connection between the substrate 11 and a circuit board 28 (such as a flexible circuit board, etc.) is realized through a solder layer or a metal solder ball 113 or the like. In addition, the space between the substrate 11 and the circuit board 28 is filled with an underfill glue 114 through an underfill technology. In some embodiments, the underfill glue 114 is a chemical glue whose main component is epoxy resin, and is used for underfilling chips in a BGA (Ball Grid Array, Ball Grid Array) packaging mode, for example.

The cover ring 26 is disposed on the circuit board 28 , has a top opening, and defines a packaging space with the circuit board 28 . The cover ring 26 can be formed of metal or plastic, and it can be, for example, circular, oval, square or rectangular, and the present invention is not limited thereto.

The substrate 11 , the fingerprint recognition sensor 12 , the control module 13 , the light source module 14 and the light source sensing module 15 are arranged in the packaging space defined by the cover ring 26 and the circuit board 28 .

The molding layer 27 is formed on the substrate 11, and fills the packaging space defined by the cover ring 26 and the circuit board 28, enclosing the fingerprint recognition sensor 12, the control module 13, the light source module 14 and the light source sensing module 15. . The material used for the molding layer 27 is, for example, epoxy molding compound (EMC).

In some embodiments, a protective layer (not shown in the figure) is further formed on the molding layer 27 , and the protective layer is exposed at the top opening of the cover ring 26 . The protective layer is, for example, a panel made of glass, ceramics, sapphire or quartz, which has properties of pressure resistance, scratch resistance and light transmission. The protective layer makes the fingerprint recognition device durable.

In addition, some other components 281 are provided on the surface of the circuit board 28 and the fingerprint recognition device 1 , such as inductive elements, capacitive elements, and the like. On the surface of the other side of the circuit board 28, a connector 282 is further provided, through which the electrical connection with an external circuit is realized.

The fingerprint identification device provided by the present invention uses the control module to control the light emitting mode of the light source module to detect the living body information of the object to be detected, and then judges whether it is a living body, and after confirming that it is a living body, the subsequent fingerprint recognition operation is performed, eliminating the inconvenience There is a security risk of using a prosthesis in fingerprint recognition technology; in addition, its packaging structure utilizes SIP packaging technology to integrate fingerprint recognition sensors and control modules. The light source module and the light source sensing module are integrated and packaged on the substrate, which reduces the size of the fingerprint recognition device, realizes miniaturization, and can be used in smaller handheld terminal devices.

The present invention also provides a terminal device including the above-mentioned fingerprint identification device. The terminal device is, for example, a smart phone, a tablet computer, etc., and is generally configured to include: a display screen, a touch screen, a cover glass, storage, a system on chip (system on chip), a CPU, a GPU, a memory, a Wi-Fi connection, a Bluetooth connection, USB connection, battery, external power supply, computer readable media and software, etc., but the present invention is not limited thereto.

The fingerprint identification device provided by the present invention is integrated in the terminal device, for example, integrated in the screen or casing of the terminal device, and located on the top surface of the screen or casing of the terminal device; The switching elements are used in combination, and can also be directly embedded in the cover glass or housing of the terminal equipment and used alone. In short, adaptive adjustments can be made according to the conditions of the terminal equipment, so as to facilitate the use of the user. When the fingerprint identification device is used in combination with the control button or switch element of the terminal device, a pressure sensitive element needs to be provided under the fingerprint identification device to sense the user's pressing operation when operating the control button or switch element.

Exemplary embodiments of the present invention 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 (8)

1. a kind of fingerprint identification device, which is characterized in that including：

Circuit board；

Substrate, is formed in the upper surface of the circuit board, and with the circuit board electrical connection；

Fingerprint Identification sensor is formed in the upper surface far from the circuit board of the substrate, is electrically connected with the substrate；

Light source module is formed in the upper surface far from the circuit board of the substrate, is electrically connected with the substrate, for emitting Optical signal；

Light source sensing module is formed in the upper surface far from the circuit board of the substrate, is electrically connected, is used for the substrate It senses and receives the optical signal of light source module transmitting by the reflected light signal after object reflection to be detected, and by the reflection Optical signal is converted to electric signal, according to the electric signal, to judge whether the object to be detected is live body；

Control module is formed in the upper surface far from the circuit board of the substrate, is electrically connected with the substrate, for controlling The light source module emits the optical signal；

Bezel ring, has top opening, is formed in the upper surface of the circuit board, and an encapsulated space is constituted with the circuit board, described Encapsulated space is by the substrate, the fingerprint Identification sensor, the light source module, the light source sensing module and the control Module is placed in wherein；And

Molding layer is filled in the encapsulated space；

The wherein described light source module includes：Red-light LED, infrared light LED and green light LED, the control module control the green light LED is lighted and at least one of the red-light LED and the infrared light LED are lighted.

2. fingerprint identification device according to claim 1, which is characterized in that the control module is MCU controllers.

3. fingerprint identification device according to claim 1, which is characterized in that the bezel ring, is by metal or plastic material system At.

4. fingerprint identification device according to claim 1, which is characterized in that the fingerprint Identification sensor includes a weldering Disk；The pad is set to the upper surface of the fingerprint Identification sensor, and is electrically connected with the substrate by metal wire.

5. fingerprint identification device according to claim 4, which is characterized in that the metal wire includes：Gold thread, aluminum steel, copper At least one of line, al-mg-si alloy line and Al-zn-mg-cu alloy line.

6. fingerprint identification device according to claim 1, which is characterized in that the substrate passes through scolding tin with the circuit board Layer or metal soldered ball electrical connection.

7. fingerprint identification device according to claim 1, which is characterized in that be also formed on the lower surface of the circuit board Connector, to be connect with external circuit by the connector.

8. a kind of terminal device, which is characterized in that including claim 1-7 any one of them fingerprint identification devices.