WO2020220219A1

WO2020220219A1 - Biometric feature identification apparatus and method, and electronic device

Info

Publication number: WO2020220219A1
Application number: PCT/CN2019/085053
Authority: WO
Inventors: 龙卫; 蒋科强
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2019-04-29
Filing date: 2019-04-29
Publication date: 2020-11-05
Also published as: CN110235142B; CN110235142A

Abstract

Provided are a biometric feature identification apparatus and method, and an electronic device. The biometric feature identification apparatus comprises a light source module, a light-blocking component and a first sensor chip, wherein the light source module is used for generating a first optical signal, and the first optical signal is used for passing through a back shell cover plate and is reflected or transmitted by a finger or a palm on the back shell cover plate to the first sensor chip below the back shell cover plate; the light-blocking component is used for isolating the light source module from the first sensor chip to prevent the first optical signal from being directly incident to the first sensor chip; and the first sensor chip is used for performing fingerprint identification according to the first optical signal reflected or transmitted by the finger, or the first sensor chip is used for performing palmprint identification according to the first optical signal reflected or transmitted by the palm. The biometric feature identification apparatus and method and the electronic device in the embodiments of the present application are beneficial for the reduction of the complexity and cost of a fingerprint identification apparatus.

Description

Biometric identification device, method and electronic equipment

Technical field

The embodiments of the present application relate to the field of biometric identification technology, and more specifically, to a biometric identification device, method, and electronic equipment.

Background technique

The disclosed optical fingerprint recognition technology is mainly an under-screen fingerprint recognition technology. This solution is limited to the screen that can only use a self-luminous function display, such as an organic light emitting diode (Organic Light Emitting Diode, OLED) screen, and it needs to be guided. The optical layer or optical path guiding structure guides the light reflected by the finger to the sensor chip, such as a periodic small hole array or microlens.

With the widespread application of optical fingerprint identification technology, higher and higher requirements are put forward on the complexity and cost of fingerprint identification devices.

Summary of the invention

In view of this, the embodiments of the present application provide a biometric identification device, method, and electronic equipment, which are beneficial to reduce the complexity and cost of the fingerprint identification device.

In a first aspect, a biometric identification device is provided, which is applied to an electronic device with a rear shell cover, the biometric identification device is arranged under the rear shell cover, wherein the biometric identification device includes a light source Module, light-blocking component and a first sensor chip, the light source module is used to generate a first light signal, the first light signal is used to pass through the back cover plate, and pass through the back cover plate Fingers or palms are reflected or transmitted to the first sensor chip under the back cover plate; the light blocking component is used to isolate the light source module from the first sensor chip to prevent the first light The signal is directly incident on the first sensor chip; the first sensor chip is used for fingerprint recognition based on the first light signal reflected or transmitted by the finger, or the first sensor chip is used for fingerprint recognition based on the Palmprint recognition is performed by the first light signal reflected or transmitted by the palm.

Compared with the under-screen optical fingerprint identification device, the biometric identification device is arranged on the back cover of the electronic device and has nothing to do with the display screen. Therefore, it is not affected by the self-luminous or non-self-luminous display of the display. In addition, the biometric identification device makes the light signal generated by the light source module not directly incident on the sensor chip through the light blocking component, so that the light signal reflected by the finger can be directly incident on the sensor chip for fingerprint recognition, and no light path is required. The guiding structure guides the light signal reflected by the finger to the sensor chip, with a simple structure and low cost.

In addition, the biometric identification device can also directly incident the light signal reflected by the palm onto the sensor chip for palmprint identification.

In a possible implementation manner, the biometric identification device further includes a second sensor chip, the light source module is also used to generate a second light signal, and the second light signal is used to pass through the back cover Plate, which is absorbed by the blood vessels in the fingers or palms on the back cover plate and reflected or transmitted to the second sensor chip under the back cover plate; the light blocking component is also used for the light source The module is isolated from the second sensor chip to prevent the second light signal from being directly incident on the second sensor chip; the second sensor chip is used according to the reflection or reflection of blood vessels inside the finger or palm The transmitted second light signal performs heart rate detection.

The biometric identification device also has a heart rate detection function, which can combine the fingerprint/palmprint identification function and the heart rate detection function to make the biometric identification smarter.

Optionally, the second sensor chip may be a photodiode (PD) receiving element.

In a possible implementation, the first sensor chip is used to perform fingerprint recognition based on the first light signal reflected or transmitted by the finger after the second sensor chip passes the heart rate detection, or Palmprint recognition is performed according to the first light signal reflected or transmitted through the palm.

The heart rate test is performed first, and after the heart rate test is qualified, the fingerprint/palmprint recognition function is turned on to make the biometric identification device more power-saving.

In a possible implementation, the light blocking component includes a first light blocking structure and a second light blocking structure, and the first light blocking structure surrounds the periphery of the first sensor chip and is connected to the back cover The board is attached, and the second light-blocking structure surrounds the circumference of the second sensor chip and is attached to the back cover plate.

In a possible implementation manner, the first sensor chip and the second sensor chip are arranged on the same side of the light source module, and the light blocking component surrounds the first sensor chip and the second sensor And adhere to the rear cover plate.

In a possible implementation manner, the light source module includes a first light source and a second light source, and the first light source and the second light source are respectively disposed at two opposite sides of the first sensor chip.

The light sources are respectively arranged on both sides of the first sensor chip, so that the sensor chip can evenly receive light signals.

In a possible implementation manner, the area of the first sensor chip is greater than or equal to the fingerprint recognition area of the electronic device.

The area of the first sensor chip can mean that the area of one sensor chip is greater than or equal to the fingerprint recognition area, or it can mean that the area of a plurality of first sensor chips is greater than or equal to the fingerprint recognition area. The sensor chip does not need a light path guide structure to receive a relatively complete light signal reflected by the finger.

In a possible implementation manner, the area of the first sensor chip is larger than the area of the second sensor chip.

In a possible implementation, the light source module includes a third light source and a fourth light source, the second light signal generated by the third light source is infrared light, and the second light signal generated by the fourth light source is infrared light. The light signal is green light or blue light, and the second sensor chip is used to perform heart rate detection according to the second light signal generated by the third light source and the second light signal generated by the fourth light source in sequence.

Before fingerprint/palmprint recognition, two heart rate detections are performed to make the accuracy of living body detection higher.

In a possible implementation manner, the material of the light blocking component includes at least one of the following materials: foam, plastic, and metal.

In a possible implementation manner, the light-blocking component is fixedly connected to the rear shell cover through double-sided adhesive, dispensing or light-shielding adhesive.

In a possible implementation manner, there is an air gap between the light source module and the rear housing cover, or the light source module and the rear housing cover are fixedly attached.

In a possible implementation, the biometric identification device further includes: a filter, which is arranged above the first sensor chip, and is configured to detect the first light reflected or transmitted by the finger or palm. The signal is filtered.

In a possible implementation, the filter is disposed above the first sensor chip in any of the following ways: the filter is attached to the first sensor chip; the filter The sheet is attached to the edge of the first sensor chip and is suspended from the photosensitive area of the first sensor chip; the filter sheet is suspended above the first sensor chip.

In a second aspect, a biometric identification method is provided, which is applied to an electronic device having a rear shell cover and a biometric identification device. The biometric identification device is provided under the rear shell cover, and the biometric identification The device includes a light source module, a light blocking component, and a first sensor chip. The biometric identification method includes: the light source module generates a first light signal, and the first light signal is used to pass through the back cover plate and The first sensor chip reflected or transmitted by the fingers or palms on the back cover plate to the bottom of the back cover plate; the first sensor chip is based on the first sensor chip reflected or transmitted through the fingers Fingerprint recognition based on optical signals, or palmprint recognition based on the first light signal reflected or transmitted through the palm; wherein the light blocking component is used to isolate the light source module from the first sensor chip, This prevents the first light signal from directly incident on the first sensor chip.

In a possible implementation manner, the biometric identification device further includes a second sensor chip, and the biometric identification method further includes: the light source module generates a second light signal, and the second light signal is used for transmission. After passing through the rear shell cover, passing through the blood vessels in the fingers or palms on the rear shell cover to absorb and reflect or transmit to the second sensor chip below the rear shell cover; the second sensor chip Perform heart rate detection according to the second light signal reflected or transmitted through the blood vessel inside the finger or the palm; wherein the light blocking component is also used to isolate the light source module from the second sensor chip , To prevent the second light signal from directly incident on the second sensor chip.

In a possible implementation, the first sensor chip performs fingerprint recognition based on the first light signal reflected or transmitted through the finger, or based on the first light signal reflected or transmitted through the palm The palmprint recognition includes: in the case that the second sensor chip is qualified for heart rate detection, the first sensor chip performs fingerprint recognition according to the first light signal reflected or transmitted by the finger, or according to the The first light signal reflected or transmitted by the palm performs palmprint recognition.

In a possible implementation, the light source module includes a third light source and a fourth light source, the second light signal generated by the third light source is infrared light, and the second light signal generated by the fourth light source is infrared light. The light signal is green light or blue light, and the second sensor chip performs heart rate detection according to the second light signal reflected or transmitted through the blood vessel inside the finger or the palm, including: the second sensor chip sequentially Perform heart rate detection according to the second light signal generated by the third light source and the second light signal generated by the fourth light source.

Optionally, the biometric identification method is applied to the biometric identification device in the first aspect or any of its possible implementation manners.

In a third aspect, an electronic device is provided, which includes the biometric identification device and the rear shell cover described in the first aspect or any possible implementation of the first aspect.

These and other aspects of the application will be more concise and understandable in the description of the following embodiments.

Description of the drawings

Figure 1 shows a schematic structural diagram of a typical application scenario of a fingerprint identification device.

Fig. 2 shows a schematic structural diagram of a biometric identification device according to an embodiment of the present application.

Fig. 3 shows another schematic structural diagram of the biometric identification device according to an embodiment of the present application.

Fig. 4 shows still another schematic structural diagram of the biometric identification device of the embodiment of the present application.

Fig. 5 shows a schematic block diagram of a biometric identification method according to an embodiment of the present application.

Fig. 6 shows a schematic flowchart of a biometric identification method according to an embodiment of the present application.

Detailed ways

In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art should fall within the protection scope of the embodiments of this application.

The biometric identification devices involved in the embodiments of the present application can be applied to smart phones, tablet computers, notebook computers, desktops, and other mobile terminals or other terminal devices with biometric identification devices. The biometric information includes, but is not limited to: any one or more of fingerprints, iris, retina, genes, voices, human faces, palm geometry, veins, gait, and handwriting.

Current biometric identification devices, such as fingerprint identification devices, are arranged in a partial area or all areas below the display screen to form an under-display optical fingerprint system.

In a common application scenario, the fingerprint identification device is used in terminal equipment. Figure 1 shows a schematic structural diagram of a terminal device. As shown in FIG. 1, the terminal device 100 includes a display screen 120 and an optical fingerprint device 130, wherein the optical fingerprint device 130 is arranged in a partial area below the display screen 120. The optical fingerprint device 130 includes an optical fingerprint sensor, and the optical fingerprint sensor includes a sensing array with a plurality of optical sensing units, and the area where the sensing array is located or the sensing area thereof is the fingerprint recognition area of the optical fingerprint device 130. As shown in FIG. 1, the fingerprint recognition area is located in the display area of the display screen 120.

As an optional implementation, as shown in FIG. 1, the optical fingerprint device 130 includes a photodetection part 134 and an optical component 132, and the photodetection part 134 includes the sensor array and is electrically connected to the sensor array. The connected reading circuit and other auxiliary circuits can be fabricated on a chip (Die) through a semiconductor process, such as an optical imaging chip or an optical fingerprint sensor chip. The sensing array is specifically a photodetector (Photodetector) array. It includes a plurality of photodetectors distributed in an array. The photodetectors can be used as the above-mentioned optical sensing unit; the optical component 132 can be arranged above the sensing array of the photodetecting part 134, which can at least Including light guide layer or light path guide structure. The light guide layer or light path guide structure is mainly used to guide the reflected light reflected from the finger surface to the sensor array for optical detection.

There are multiple implementation schemes for the light guide layer or light path guiding structure of the optical component 132. For example, the light guide layer may specifically be a collimator layer made on a semiconductor silicon wafer, which has multiple collimators. Straight unit or micro-hole array; for another example, the light guide layer or light path guiding structure may also be an optical lens (Lens) layer, which has one or more lens units; for another example, the light guide layer or light path guiding structure It is also possible to specifically adopt a micro-lens (Micro-Lens) layer having a micro-lens array formed by a plurality of micro-lens.

The display screen 120 needs to adopt a display screen with a self-luminous display unit, for example, an OLED screen.

It can be found that the optical fingerprint device in Figure 1 can only use a display screen with a self-luminous unit, and the optical fingerprint device needs to use a light guide layer or light path guiding structure to guide the light reflected by the finger to the fingerprint sensor, so that the optical fingerprint The implementation complexity of the device increases, and the cost increases.

Figure 2 is a schematic structural diagram of a biometric identification device provided by an embodiment of the present application. The biometric identification device is applied to an electronic device with a rear shell cover. As shown in FIG. 2, the biometric identification device is arranged under the rear shell cover 10, wherein the biometric identification device includes a light source Module 210, light blocking component 220 and first sensor chip 230. The light source module 210 is used to generate a first light signal. The first light signal is used to pass through the back cover plate 10 and pass through the back Fingers or palms on the cover plate 10 are reflected or transmitted to the first sensor chip 230 below the back cover plate 10; the light blocking component 220 is used to connect the light source module and the first sensor chip 230 is isolated to prevent the first light signal from directly incident on the first sensor chip 230; the first sensor chip 230 is used to perform fingerprint recognition based on the first light signal reflected or transmitted by the finger, Or the first sensor chip 230 is used for palmprint recognition according to the first light signal reflected or transmitted through the palm.

In the embodiment of the present application, when a finger or palm touches the back cover plate 10, the first light signal emitted by the light source module 220 cannot be directly incident on the first sensor chip 230 under the action of the light blocking component 220, and It passes through the rear housing cover 10, is reflected or transmitted by a finger or palm, and then passes through the rear housing cover 10 and is directly received by the first sensor chip 230. Wherein, the rear housing cover plate 10 needs to have a light-transmitting function. For example, the material of the rear housing cover plate 10 is glass or ceramic. The rear shell cover can be integrated with the electronic device, or it can be integrated with the biometric identification device and installed on the electronic device, that is, the biometric identification device in the embodiment of the present application may include the rear shell cover .

When the biometric identification device of the embodiment of the present application only has a fingerprint identification function, the biometric identification device is a fingerprint identification device.

Therefore, in contrast to the under-screen optical fingerprint identification device, the biometric identification device is arranged under the back cover of the electronic device and has nothing to do with the display screen, so it is not affected by the self-luminous or non-self-luminous display of the display. . In addition, the biometric identification device makes the light signal generated by the light source module not directly incident on the sensor chip through the light blocking component, so that the light signal reflected by the finger can be directly incident on the sensor chip for fingerprint recognition, and no light path is required. The guiding structure guides the light signal reflected by the finger to the sensor chip, with a simple structure and low cost.

It should be noted that the positional relationship in the embodiments of the present application is described as an example when the electronic device is placed horizontally, the display screen of the electronic device is below, and the rear case is above.

Optionally, in the embodiment of the present application, as shown in FIG. 3, the biometric identification device further includes a second sensor chip 240, and the light source module 210 is also used to generate a second light signal. Signals are used to pass through the back cover plate 10, absorb and reflect or transmit to the second sensor chip under the back cover plate 10 by the blood vessels in the fingers or palms on the back cover plate 10 The light blocking component 220 is also used to isolate the light source module 210 and the second sensor chip 240 to prevent the second light signal from directly incident on the second sensor chip 240; the second sensor The chip 240 is used for detecting the heart rate according to the second light signal reflected or transmitted through the blood vessel inside the finger or the palm.

When the finger or palm touches the back cover, the light signal from the light source module illuminates the blood vessel inside the finger or palm. Since blood can absorb light of a specific wavelength, it is reflected or refracted as the blood in the blood vessel changes. The intensity of the light signal will also show regular changes. The second sensor acquires the intensity change of the reflected or refracted light signal, and the heart rate value of the human body is obtained through signal-to-noise processing.

Match the obtained heart rate value with the heart rate value obtained during registration. If it is within the error range, the heart rate test is qualified; if it is outside the error range, the heart rate test fails.

It should be understood that the biometric identification device may also only have a heart rate detection function. For example, the electronic device with the biometric identification device is a watch. Among them, the wrist is attached to the back cover in the dial. The light signal generated by the light source module can pass through the back cover. After reflection or transmission by the blood vessels in the wrist, it is directly incident on the second sensor through the back cover. On the chip (that is, the sensor for heart rate detection), the second sensor chip can perform heart rate detection according to the received light signal. At this time, heart rate detection can also be replaced with pulse detection.

In the heart rate/pulse detection, the human heart rate changes can be detected in real time to perform live body detection.

When the biometric identification device has both fingerprint or palmprint recognition function and heart rate detection function, the first sensor chip with fingerprint or palmprint recognition function and the second sensor chip with heart rate detection function can be set independently in position, for example The light source module can include multiple light sources, the first sensor chip and the second sensor chip can use separate light sources, and use independent light blocking structures (which can be regarded as substructures of light blocking components) to connect each sensor chip with each Light source isolation. For another example, the first sensor chip and the second sensor chip may share the light source module, but use independent light-blocking structures to isolate each sensor chip from the shared light source module. Specifically, the light source module may be arranged on the first sensor chip and Between the second sensor chip. Alternatively, the first sensor chip and the second sensor chip may share the light source module and are arranged on the same side of the light source module. Using a light-blocking structure can isolate the light source module from the first sensor chip and isolate the light source module from the second sensor chip. Specifically, the second sensor chip may be arranged on the first sensor chip. The first sensor chip may be an image sensor, and the second sensor chip may be a PD receiving element.

When the biometric identification device has both fingerprint or palmprint recognition functions and heart rate detection functions, the first sensor chip and the second sensor chip can perform fingerprint or palmprint recognition and heart rate detection at the same time, or the first sensor chip can perform fingerprints first Or palm print recognition, the second sensor chip performs heart rate detection, or it may also be that the second sensor chip performs heart rate detection first, and the second sensor chip performs fingerprint or palm print recognition. Specifically, after the second sensor chip has passed the heart rate detection, the first sensor chip may perform fingerprint or palmprint recognition, that is, after the second sensor chip has passed the heart rate detection, the first sensor chip can start working.

In other words, the first sensor chip is used to perform fingerprint recognition based on the first light signal reflected or transmitted through the finger after the second sensor chip has passed the heart rate detection, or based on passing through the palm The reflected or transmitted first light signal performs palmprint recognition.

The biometric identification device in the embodiment of the present application will be described in detail below with reference to FIG. 4. As shown in Figure 4, the fingerprint/palmprint recognition module and the heart rate detection module are separately arranged, the light blocking component includes a first light blocking structure and a second light blocking structure, and the light source module includes a first light source, a second light source, a third light source and The fourth light source. Wherein, the first light source and the second light source are used to provide light signals for the first sensor chip, and the third light source and the fourth light source are used to provide light signals for the second sensor chip. The first light blocking structure may be arranged around the periphery of the first sensor chip and attached to the back cover plate, and the second light blocking structure may be arranged around the circumference of the second sensor chip and attached to the back cover plate. Optionally, the first light blocking structure may also be arranged around the first light source and the second light source and be attached to the back cover plate, and the second light blocking structure may also surround the third light source and the fourth light source. Set and fit with the back cover plate. Optionally, the first light blocking structure may also be arranged around the circumference of the first sensor chip and the circumference of the first light source and the second light source respectively, and the second light blocking structure may also surround the circumference of the second sensor chip and the circumference of the second light source respectively. The three light sources and the fourth light source are arranged around.

Optionally, the light blocking component may also surround the bottom of each of the above-mentioned components, that is, each of the above components may pass through the light blocking component and a flexible printed circuit (FPC) or a printed circuit board (Printed Circuit Board). PCB) bonding.

As shown in FIG. 4, the first light source and the second light source may be arranged on both sides of the first sensor chip, that is, the first light source and the second light source may be arranged on two opposite sides of the first sensor chip. The third light source and the fourth light source may be arranged on the same side of the second sensor chip. The third light source and the fourth light source may emit light of the same wavelength or different wavelengths. For example, the third light source may be an infrared light source, and the fourth light source may be a green light source or a blue light source. When a finger or palm is pressed on the back cover, the heart rate can be detected twice. For example, the third light source can be turned on first, and the second sensor chip can perform heart rate detection based on the light signal emitted by the third light source. After the heart rate is qualified, the fourth light source can be turned on. The second sensor chip can be based on the light signal emitted by the fourth light source. Light signal, heart rate detection again. After passing the heart rate test again, the fingerprint or palmprint recognition function is turned on. Optionally, the third light source and the fourth light source can also be turned on at the same time, so the second sensor chip can obtain red light, blue light/green light, etc. at the same time.

In the embodiment of the present application, the first light source and the second light source may be the same light source or different light sources, and the first light source and the second light source may be any of a red light source, a green light source, and a blue light source, respectively. A light source. Similarly, the third light source and the fourth light source can also be any one of an infrared source, a green light source, and a blue light source, respectively. It should be understood that the number of light sources in FIG. 4 is only for illustration, and the embodiment of the present application should not limit the number of light sources. The first sensor chip and the second sensor chip may share one light source, or one light source may be provided for the first sensor chip and the second sensor chip respectively, or multiple light sources may be provided for the first sensor chip and the second sensor chip. It should also be understood that the position of the light source in FIG. 4 is only used for illustration and not for limitation.

Optionally, the light source can be normally on when it is turned on, or it can be lit periodically, for example, the interval time can be S≤10s.

Optionally, as shown in FIG. 4, the area of the first sensor chip is significantly larger than the area of the second sensor chip. When a finger or palm touches the back cover, it should be able to cover both the fingerprint/palmprint recognition module and the heart rate detection module.

Optionally, in this embodiment of the present application, the area of the first sensor chip should be greater than or equal to the fingerprint recognition area or palmprint recognition area of the first sensor chip. In other words, the light signal reflected by the finger or palm can be completely transmitted to the first sensor chip. Therefore, the fingerprint/palmprint recognition module can directly transmit the light signal reflected by the finger or the palm to the first sensor chip without a light guide layer or a light path guide structure.

Optionally, in the embodiment of the present application, the material of the light blocking component may be foam, plastic, or metal with low light transmittance. The light-blocking component can use a single material or multiple materials at the same time. The light blocking component can also be filled with foam between the cover plate of the back shell, and at this time, the foam can be regarded as a part of the light blocking component. Or the light-blocking component can also be attached to the back cover plate by using double-sided adhesive, dispensing or light-shielding glue. In this case, the double-sided tape, dispensing or light-shielding glue can also be regarded as a part of the light-blocking component.

Optionally, the light source module in the embodiment of the present application may be fixed on a substrate such as an FPC or PCB as shown in FIG. 2 or FIG. 3, and is parallel to the rear housing cover. There may be an air gap between the light source module and the rear housing cover plate, or it may be directly attached to the rear housing cover plate. For example, the light source module and the rear housing cover can be sealed with glue equivalent to glass refraction. The light source module can also be fixed on an additional fixing plate, forming an angle with the back cover plate.

Optionally, a filter may be provided on the first sensor chip to filter the light signal reflected or transmitted back by the finger or palm. It should be understood that the filter is optional but not required. The filter can all be attached to the first sensor chip, for example, attached by transparent glue. The filter can also be attached to the edge of the first sensor chip and suspended in the photosensitive area of the first sensor chip. Or the filter can also be completely suspended above the first sensor chip. For example, it is fixed on the light blocking component.

Above, the biometric identification device of the embodiment of the present application has been described in detail with reference to FIGS. 2 to 4. Hereinafter, a biometric identification method 200 according to an embodiment of the present application will be introduced and explained with reference to FIG. 5.

It should be understood that FIG. 5 shows the detailed steps or operations of the biometric identification method of the embodiment of the present application, but these steps or operations are only examples, and the embodiment of the present application may also perform other operations or various operations of FIG. 5 Deformed. In addition, each step in FIG. 5 may be performed in a different order from that shown in FIG. 5, and it is possible that not all operations in FIG. 5 are to be performed.

The biometric identification method according to the embodiment of the present application can be applied to an electronic device having a rear shell cover and a biometric identification device. The biometric identification device is the above-mentioned biometric identification device. The biometric identification method can at least Perform fingerprint or palmprint recognition. The biometric identification device is arranged under the back cover plate, and the biometric identification device includes a light source module, a light blocking component and a first sensor chip.

As shown in FIG. 5, the biometric identification method 200 includes some or all of the following content:

S210. The light source module generates a first light signal, and the first light signal is used to pass through the back cover plate, and is reflected or transmitted to the back cover by the fingers or palm on the back cover plate. The first sensor chip under the cover.

S220: The first sensor chip performs fingerprint recognition according to the first light signal reflected or transmitted through the finger, or performs palmprint recognition according to the first light signal reflected or transmitted through the palm.

Wherein, the light blocking component is used to isolate the light source module from the first sensor chip to prevent the first light signal from directly incident on the first sensor chip.

Optionally, in the embodiment of the present application, the biometric identification device further includes a second sensor chip, and the biometric identification method further includes: the light source module generates a second optical signal, and the second optical signal uses After passing through the back cover plate, the blood vessels inside the fingers or palms on the back cover plate absorb and reflect or transmit to the second sensor chip under the back cover plate; the second The sensor chip detects the heart rate according to the second light signal reflected or transmitted through the blood vessel inside the finger or the palm;

Wherein, the light blocking component is also used to isolate the light source module from the second sensor chip, so as to prevent the second light signal from directly incident on the second sensor chip.

Optionally, in the embodiment of the present application, the first sensor chip performs fingerprint recognition based on the first light signal reflected or transmitted through the finger, or based on the first light signal reflected or transmitted through the palm. Recognizing the palmprint by the light signal includes: when the second sensor chip is qualified for heart rate detection, the first sensor chip performs fingerprint recognition according to the first light signal reflected or transmitted by the finger, or Palmprint recognition is performed according to the first light signal reflected or transmitted through the palm.

Optionally, in the embodiment of the present application, the light source module includes a third light source and a fourth light source, the second light signal generated by the third light source is infrared light, and the fourth light source generated The second light signal is green light or blue light, and the second sensor chip performs heart rate detection based on the second light signal reflected or transmitted through the blood vessel inside the finger or the palm, including: the second sensor The chip sequentially detects the heart rate according to the second light signal generated by the third light source and the second light signal generated by the fourth light source.

Specifically, biometric identification can be performed according to the flow of FIG. 6. When a new user registers, the heart rate P0 and fingerprint/palmprint image M0 can be obtained, and the tolerance of the heart rate can be set to N. When the biometric recognition starts, the third light source performs regular scanning, the second sensor chip can obtain the heart rate value P1, and judge whether the heart rate value P1 is within the range of P0±N, and if it is not within the range, the second sensor chip Then obtain the heart rate value according to the light signal emitted by the third light source again; if it is within this range, the fourth light source is turned on, the second sensor chip can obtain the heart rate value P2, and again determine whether the heart rate value P2 is in the range of P0±N within. Similarly, if it is not within the range, the second sensor chip will obtain the heart rate value again according to the light signal emitted by the third light source; if it is within the range, the first sensor chip will be turned on to perform fingerprint/palmprint recognition, In this way, the fingerprint/palmprint image M1 is obtained, and M1 is matched with the M0 entered during registration. If the matching is successful, the electronic device is unlocked successfully, and if the matching is unsuccessful, the heart rate detection step is returned.

It should be understood that the flow in FIG. 6 is only an illustration of the biometric identification method, and the biometric identification method in the embodiment of the present application may include part of the steps in FIG. 6 or may be a modification of each step in FIG. 6. The embodiments of the application should not be limited to this.

It should also be understood that the specific structure of the biometric identification device of the embodiment of the present application can be referred to the biometric identification device described in FIG. 2 to FIG.

An embodiment of the present application also provides an electronic device, which includes the biometric identification device and the back cover plate described in the foregoing various embodiments.

Optionally, the electronic device may further include a control circuit for controlling the turn-on sequence of the first sensor chip and the second sensor chip. The control circuit can also control the turn-on sequence of each light source in the light source module. For example, it can be controlled to turn on the second sensor chip first, and then turn on the first sensor chip. For another example, when performing heart rate detection, the infrared light source may be controlled to turn on first, and then the green light source or the blue light source may be controlled to turn on. For another example, when the light source is controlled to be turned on, the light source may be controlled to be always on or periodically lit.

It should be understood that in practical applications, the control circuit can be provided in the biometric identification device, or can also be provided in the electronic equipment installed in the biometric identification device, that is, the function of the control circuit can be implemented in the electronic equipment , Or it may be implemented partly in the biometric identification device and partly in the electronic device, which is not limited in the embodiment of the present application.

Optionally, the biometric identification device can be installed on the back of the electronic device.

Optionally, the electronic device may be a terminal device such as a mobile phone, an attendance machine, and a watch.

It should be understood that “one embodiment” or “an embodiment” mentioned throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present application. Therefore, the appearance of "in one embodiment" or "in an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics can be combined in one or more embodiments in any suitable manner.

A person of ordinary skill in the art may be aware that the units and circuits of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

In the several embodiments provided in this application, it should be understood that the disclosed circuits, branches, and units may be implemented in other ways. For example, the branches described above are illustrative, for example, the division of the unit is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or integrated into A branch or some features can be ignored or not implemented.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims

A biometric identification device, which is characterized in that it is applied to an electronic device with a rear shell cover, the biometric identification device is arranged under the rear shell cover, and the biometric identification device includes a light source module, The light blocking component and the first sensor chip,

The light source module is used to generate a first light signal, and the first light signal is used to pass through the back cover plate, and be reflected or transmitted to the back cover by a finger or palm on the back cover plate The first sensor chip under the cover plate;

The light blocking component is used to isolate the light source module from the first sensor chip to prevent the first light signal from directly incident on the first sensor chip;

The first sensor chip is used for fingerprint recognition based on the first light signal reflected or transmitted through the finger, or the first sensor chip is used for fingerprint recognition based on the first light reflected or transmitted through the palm Signal for palmprint recognition.
The biometric identification device according to claim 1, wherein the biometric identification device further comprises a second sensor chip,

The light source module is also used to generate a second light signal, the second light signal is used to pass through the back cover plate, absorb and reflect or transmit through the blood vessels inside the finger or palm of the back cover plate To the second sensor chip under the back cover plate;

The light blocking component is also used to isolate the light source module from the second sensor chip, so as to prevent the second light signal from directly incident on the second sensor chip;

The second sensor chip is used for detecting the heart rate according to the second light signal reflected or transmitted through the blood vessel inside the finger or the palm.
2. The biometric identification device according to claim 2, wherein the first sensor chip is used to perform a heart rate test based on the first sensor chip reflected or transmitted by the finger after the second sensor chip Fingerprint recognition is performed on the optical signal, or palmprint recognition is performed on the basis of the first optical signal reflected or transmitted through the palm.
The biometric identification device according to claim 2 or 3, wherein the light blocking component comprises a first light blocking structure and a second light blocking structure, and the first light blocking structure surrounds the first sensor chip The second light-blocking structure is arranged around the periphery of the second sensor chip and is attached to the back cover plate, and the second light blocking structure is arranged around the circumference of the second sensor chip and is attached to the back cover plate.
The biometric identification device according to claim 2 or 3, wherein the first sensor chip and the second sensor chip are arranged on the same side of the light source module, and the light blocking component surrounds the first sensor chip. A sensor chip and the second sensor are arranged around and attached to the back cover plate.
The biometric identification device according to any one of claims 1 to 5, wherein the light source module comprises a first light source and a second light source, and the first light source and the second light source are respectively disposed in the Describe the positions of the two opposite sides of the first sensor chip.
The biometric identification device according to any one of claims 1 to 6, wherein the area of the first sensor chip is greater than or equal to the fingerprint recognition area or the palmprint recognition area of the first sensor chip.
The biometric identification device according to any one of claims 2 to 5, wherein the area of the first sensor chip is larger than the area of the second sensor chip.
The biometric identification device according to any one of claims 2 to 5, wherein the light source module comprises a third light source and a fourth light source, and the second light signal generated by the third light source is infrared Light, the second light signal generated by the fourth light source is green light or blue light, and the second sensor chip is used for sequentially according to the second light signal generated by the third light source and the fourth light source The generated second light signal performs heart rate detection.
The biometric identification device according to any one of claims 1 to 9, wherein the material of the light blocking component includes at least one of the following materials: foam, plastic, and metal.
The biometric identification device according to any one of claims 1 to 10, wherein the light blocking component is fixedly connected to the rear shell cover through double-sided adhesive, dispensing or light-shielding adhesive.
The biometric identification device according to any one of claims 1 to 11, wherein there is an air gap between the light source module and the back cover, or the light source module and the back cover The board is fixed and fitted.
The biometric identification device according to any one of claims 1 to 12, wherein the biometric identification device further comprises:

The filter is arranged above the first sensor chip and used to filter the first light signal reflected or transmitted by the finger or palm.
The biometric identification device according to claim 13, wherein the filter is arranged above the first sensor chip in any of the following ways:

The filter is attached to the first sensor chip;

The filter is attached to the edge of the first sensor chip and suspended from the photosensitive area of the first sensor chip;

The filter is suspended above the first sensor chip.
A biometric identification method, characterized in that it is applied to an electronic device having a rear shell cover and a biometric identification device, the biometric identification device is arranged under the rear shell cover, and the biometric identification device includes The light source module, the light blocking component and the first sensor chip, the biometric identification method includes:

The light source module generates a first light signal, and the first light signal is used to pass through the rear case cover plate, and is reflected or transmitted to the rear case cover plate by a finger or palm on the rear case cover plate The first sensor chip below;

The first sensor chip performs fingerprint recognition according to the first light signal reflected or transmitted through the finger, or performs palmprint recognition according to the first light signal reflected or transmitted through the palm;

Wherein, the light blocking component is used to isolate the light source module from the first sensor chip to prevent the first light signal from directly incident on the first sensor chip.
The biometric identification method according to claim 15, wherein the biometric identification device further comprises a second sensor chip, and the biometric identification method further comprises:

The light source module generates a second light signal, and the second light signal is used to pass through the back cover plate, absorb and reflect or transmit to the blood vessel inside the finger or palm of the back cover plate. The second sensor chip under the back cover plate;

The second sensor chip detects the heart rate according to the second light signal reflected or transmitted through the blood vessel inside the finger or the palm;

Wherein, the light blocking component is also used to isolate the light source module from the second sensor chip, so as to prevent the second light signal from directly incident on the second sensor chip.
The biometric identification method according to claim 16, wherein the first sensor chip performs fingerprint identification based on the first light signal reflected or transmitted through the finger, or based on the reflection or transmission through the palm The first optical signal for palmprint recognition includes:

In the case that the second sensor chip is qualified for heart rate detection, the first sensor chip performs fingerprint recognition based on the first light signal reflected or transmitted by the finger, or based on the fingerprint reflected or transmitted by the palm The first light signal performs palmprint recognition.
The biometric identification method according to claim 16 or 17, wherein the light blocking component comprises a first light blocking structure and a second light blocking structure, and the first light blocking structure surrounds the first sensor chip. The second light-blocking structure is arranged around the periphery of the second sensor chip and adhered to the rear housing cover plate.
The biometric identification method according to claim 16 or 17, wherein the first sensor chip and the second sensor chip are arranged on the same side of the light source module, and the light blocking component surrounds the first sensor chip. A sensor chip and the second sensor are arranged around and attached to the back cover plate.
The biometric identification method according to any one of claims 15 to 19, wherein the light source module comprises a first light source and a second light source, and the first light source and the second light source are respectively arranged in the Describe the positions of the two opposite sides of the first sensor chip.
The biometric identification method according to any one of claims 15 to 20, wherein the area of the first sensor chip is greater than or equal to the fingerprint recognition area or the palmprint recognition area of the first sensor chip.
The biometric identification method according to any one of claims 16 to 19, wherein the area of the first sensor chip is larger than the area of the second sensor chip.
The biometric identification method according to any one of claims 16 to 19, wherein the light source module comprises a third light source and a fourth light source, and the second light signal generated by the third light source is infrared Light, the second light signal generated by the fourth light source is green light or blue light, and the second sensor chip is based on the second light signal reflected or transmitted through the blood vessel inside the finger or palm, Perform heart rate testing, including:

The second sensor chip sequentially detects the heart rate according to the second light signal generated by the third light source and the second light signal generated by the fourth light source.
The biometric identification method according to any one of claims 15 to 23, wherein the material of the light blocking component includes at least one of the following materials: foam, plastic, and metal.
An electronic device, characterized in that it comprises the biometric identification device according to any one of claims 1 to 14 and a rear shell cover.