CN111095273B - Device for biometric identification - Google Patents

Abstract

The embodiment of the application relates to a device for biometric identification. The filter device which has high transmittance for partial optical signals and high reflection characteristics for partial optical signals is arranged near the optical sensors, and two optical sensors can be simultaneously arranged at the moment so as to realize the functions of collecting and processing the optical signals of different wave bands by different optical sensors; alternatively, part of the optical signal may be allowed to pass through the filter device, so as to reflect part of the optical signal in another wavelength band without affecting the display function of the electronic device, and the reflected part of the optical signal may be received and processed by the optical sensor, thereby performing fingerprint recognition.

Description

Device for biometric identification

Priority claims of the chinese patent office filed on 22/1/2019, the PCT patent application with application number PCT/CN2019/072598, and the PCT patent application filed on 6/5/2019, the chinese patent office filed on 2019, the PCT patent application with application number PCT/CN2019/085692, are hereby incorporated by reference in their entireties.

Technical Field

The application relates to the field of biological identification, in particular to a device for biological feature identification.

Background

In the current consumer electronics field, there are many scenes that require receiving and processing electromagnetic wave signals (mainly optical signals) through sensors, such as display modules, fingerprint recognition modules, camera modules, and 3D structured light modules. In such a scenario, electromagnetic wave signals in a specific wavelength range are usually collected and processed, and the current structure can only receive and process electromagnetic wave signals in a specific wavelength range, so that the processing scenario and the amount of information obtained are limited.

Disclosure of Invention

The application provides a biological characteristic recognition device, which can realize the functions of collecting and processing optical signals of certain specific wave bands.

In a first aspect, an optical fingerprint identification device is provided, where the device is located between a liquid crystal panel and a backlight module of an electronic device, and the device includes: filter and optical sensor, the filter is located electronic equipment's display area, the plane of reflection of filter orientation liquid crystal display panel, optical sensor is located electronic equipment's non-display area, the filter is used for: transmitting an optical signal emitted by the backlight module to the liquid crystal panel, reflecting a fingerprint optical signal, and transmitting the reflected fingerprint optical signal to the optical sensor, wherein the fingerprint optical signal is an optical signal returned by the liquid crystal panel after an initial optical signal irradiates a finger above the liquid crystal panel, and the wavelength of the fingerprint optical signal is different from that of the optical signal emitted by the backlight module; the optical sensor is configured to: and receiving the fingerprint optical signal, wherein the fingerprint optical signal is used for fingerprint identification.

Consequently, the optics fingerprint identification device of this application embodiment, adopt to have high transmissivity to part light and have the filter of high reflectivity to part light, make the fingerprint light signal through this filter receive by optical sensor, this filter can also be seen through to the light that backlight unit sent simultaneously, do not block the light that backlight unit sent, make this filter place region no longer influence the demonstration, the width in non-display area has been shortened, can shorten the cell-phone black border to the cell-phone, increase cell-phone screen accounts for the ratio.

With reference to the first aspect, in an implementation manner of the first aspect, the reflective surface of the filter device is parallel to the liquid crystal panel.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, a light sensing surface of the optical sensor is perpendicular to a reflecting surface of the filter device.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the apparatus further includes a reflection unit, where the reflection unit is located above the optical sensor, a reflection surface of the reflection unit faces a light-sensing surface of the optical sensor, and the reflection unit is configured to: receiving the fingerprint light signal reflected by the filter device and reflecting the fingerprint light signal to the optical sensor; the optical sensor is configured to: receiving the fingerprint light signal reflected by the reflection unit.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, a reflection surface of the reflection unit is parallel to a light-sensing surface of the optical sensor.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, a reflection surface of the filter device is parallel to a reflection surface of the reflection unit.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the filter device is adjacent to the optical sensor.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the apparatus further includes a transmission unit, where the transmission unit is located in a light path between the filter device and the reflection unit, so as to transmit the fingerprint optical signal reflected by the filter device to a reflection surface of the reflection unit.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, one surface of the transmission unit faces a reflection surface of the filter device to receive the fingerprint optical signal reflected by the filter device, and the other surface of the transmission unit faces the reflection surface of the reflection unit to transmit the fingerprint optical signal reflected by the filter device to the reflection surface of the reflection unit.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, an optical axis of the transmission unit is parallel to a reflection surface of the reflection unit and/or a reflection surface of the filter device.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the optical signal emitted by the backlight module is visible light, and the initial optical signal is infrared light or ultraviolet light.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the apparatus further includes a light source, where the light source is configured to emit the initial light signal to the finger.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the light source is located below the liquid crystal panel, and the light source is located in a non-display area of the electronic device.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the electronic device further includes a cover plate, where the cover plate is located above the liquid crystal panel and is used for providing a touch interface for the finger.

In a second aspect, an electronic device is provided, which includes the optical fingerprint recognition apparatus as in the first aspect or any one of its possible implementations.

Optionally, the electronic device may be the electronic device in the first aspect or any one of its possible implementation manners.

In a third aspect, an apparatus for biometric identification is provided, wherein the apparatus is located below a display screen of an electronic device, and the apparatus includes: filter device, first optical sensor and second optical sensor, the filter device is used for: reflecting a first optical signal in fingerprint optical signals to the first optical sensor, and transmitting a second optical signal in the fingerprint optical signals to the second optical sensor, wherein the fingerprint optical signals are optical signals returned by a finger above the display screen after an initial optical signal is irradiated to the finger, and the wavelengths of the first optical signal and the second optical signal are different; the first optical sensor is configured to: receiving the first optical signal reflected by the filter device; the second optical sensor is configured to: and receiving the second optical signal transmitted by the filter device, wherein the first optical signal and the second optical signal are respectively used for carrying out biological characteristic identification.

Therefore, the device for biometric feature recognition of the embodiment of the present application, through the filter device which is arranged between the two sensors and has high transmittance to part of light and high reflectivity to part of light, can realize the function that different sensors respectively collect and process light signals of different wave bands, thereby realizing the recognition of multiple biometric features at the same time, or performing different recognition of the same biometric feature, for example, also obtaining two fingerprint images at the same time.

With reference to the third aspect, in an implementation manner of the third aspect, the first optical signal and the second optical signal are used for performing different biometric identifications.

With reference to the third aspect and the foregoing implementation manner of the third aspect, in another implementation manner of the third aspect, the light-sensing surface of the first optical sensor and the light-sensing surface of the second optical sensor are perpendicular to each other.

With reference to the third aspect and the foregoing implementation manner of the third aspect, in another implementation manner of the third aspect, a light sensing surface of the first optical sensor is perpendicular to the display screen and faces a reflecting surface of the filter device; the light sensing surface of the second optical sensor is parallel to the display screen and faces the display screen.

With reference to the third aspect and the foregoing implementation manner of the third aspect, in another implementation manner of the third aspect, an included angle between the reflection surface of the filter device and the photosensitive surface of the first optical sensor is equal to an included angle between the reflection surface of the filter device and the photosensitive surface of the second optical sensor.

With reference to the third aspect and the foregoing implementation manner of the third aspect, in another implementation manner of the third aspect, the biometric identification includes at least one of the following processes: fingerprint identification, heart rate detection, blood oxygen detection, blood pressure detection and living body identification.

With reference to the third aspect and the foregoing implementation manner of the third aspect, in another implementation manner of the third aspect, the first optical signal is infrared light or ultraviolet light, and the second optical signal is visible light.

With reference to the third aspect and the foregoing implementation manner of the third aspect, in another implementation manner of the third aspect, the first optical signal includes blood flow information, and the second optical signal includes fingerprint information.

With reference to the third aspect and the foregoing implementation manner of the third aspect, in another implementation manner of the third aspect, the apparatus further includes a light source, where the light source is configured to emit the initial light signal.

In a fourth aspect, an electronic device is provided, which includes the optical fingerprint recognition apparatus according to the third aspect or any one of its possible implementation manners.

Optionally, the electronic device may be the electronic device in the third aspect or any one of its possible implementation manners.

Drawings

Fig. 1 is a schematic diagram of an application scenario of a filter device.

Fig. 2 is a schematic diagram of an application scenario of another filter device.

Fig. 3 is a schematic spectral diagram of a filter device according to an embodiment of the present application.

Fig. 4 is a schematic diagram of a spectrum of a filter device according to an embodiment of the present application.

Fig. 5 is another spectral diagram of a filter device according to an embodiment of the present application.

Fig. 6 is a schematic diagram of yet another spectrum of a filter device according to an embodiment of the present application.

FIG. 7 is a top view of an electronic device including an optical fingerprint recognition device according to an embodiment of the present application.

FIG. 8 is a side view of an electronic device including an optical fingerprint recognition device according to an embodiment of the present application.

Fig. 9 is a side view of an electronic device performing fingerprint recognition according to an embodiment of the application.

FIG. 10 is a side view of an electronic device without fingerprinting in accordance with an embodiment of the application.

Fig. 11 is another side view of an electronic device performing fingerprint recognition according to an embodiment of the application.

FIG. 12 is another side view of an electronic device without fingerprinting in accordance with an embodiment of the application.

Fig. 13 is a schematic diagram of another electronic device including an apparatus for biometric identification according to an embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

It should be understood that the embodiments of the present application can be applied to biometric identification systems, such as optical fingerprint systems, including but not limited to optical fingerprint identification systems and medical diagnostic products based on optical fingerprint imaging, and the embodiments of the present application are only illustrated by way of example, but should not be construed as limiting the embodiments of the present application, and the embodiments of the present application are also applicable to other systems using optical imaging technology, etc.

As a common application scenario, the biometric identification system provided by the embodiment of the application can be applied to smart phones, tablet computers and other mobile terminals or other electronic devices with display screens; more specifically, in the above electronic device, the biometric device may include a fingerprint recognition device, which may be embodied as an optical fingerprint device, and may be disposed in a partial area or an entire area below the display screen, thereby forming an Under-display (Under-display) optical fingerprint system. Alternatively, the fingerprint identification device may be partially or completely integrated into a display screen of the electronic device, so as to form an In-display (In-display) optical fingerprint system.

In the current consumer electronics field, there are many scenes that require receiving and processing electromagnetic wave signals (mainly optical signals) through sensors, such as display modules, fingerprint recognition modules, camera modules, and 3D structured light modules.

The prior art generally collects and processes only light waves of a certain wavelength. For example, as shown in fig. 1, a filter device 110 is disposed above the sensor 120, for example, the filter device 110 may be a filter sheet. Before entering the sensor 120 for processing, a wide wavelength range electromagnetic wave (e.g., optical signal) containing valid information (e.g., fingerprint information) passes through the filter device 110, so that only valid electromagnetic wave signals pass through, e.g., only optical signals carrying valid information can pass through the filter device 110, and other invalid electromagnetic waves are filtered. In order to accomplish this function, the filter device 110 may be a narrow-band filter having a high transmittance of electromagnetic waves in a certain wavelength range, or a special substrate having a high transmittance of electromagnetic signals in a certain wavelength range and a low transmittance of electromagnetic signals in other wavelength ranges.

In addition, some scenes can modulate the transmission path of the electromagnetic wave signal at present, for example, the thickness of the whole structure can be effectively reduced by folding the light path, and the requirement for thinning electronic consumer products such as mobile phones and tablet computers can be met. As shown in fig. 2, the filter device 110 in fig. 2 is a device having a high reflectivity for light waves with a certain wavelength band, and the effective light wave signal transmitted to the filter device 110 is transmitted to the sensor 120 or transmitted to a secondary transmission medium through the filter device 110, and then reaches the sensor 120 through at least one reflection or transmission, so as to adjust the light path, and effectively reduce the thickness of the structure on the premise of meeting the requirements of the light path.

However, fig. 1 and fig. 2 have certain limitations to the application scenario, and the filtering device 110 may affect the screen display of the electronic device. Therefore, the embodiment of the present application provides an optical fingerprint identification apparatus and a biometric identification apparatus, in which a filter device having both high transmittance for a part of electromagnetic wave signals and high reflection for a part of electromagnetic wave signals is disposed near a sensor, so that the optical fingerprint identification apparatus and the biometric identification apparatus can be more widely applied to application scenarios requiring selection and processing of optical signals in a specific wavelength range, such as fingerprint identification, or special imaging applications.

It should be understood that the biometric identification device in the embodiments of the present application may include an optical fingerprint identification device for performing fingerprint identification, or may also include a device for performing fingerprint and other biometric identification. The biological characteristic identification device provided by the embodiment of the application is provided with the filter device which has high permeability for partial electromagnetic wave signals and high reflection characteristics for partial electromagnetic wave signals.

Specifically, a filter device having high transmittance for part of light and high reflectance for part of light will be described as an example. Fig. 3 to 6 show spectral diagrams of a plurality of filter devices, i.e. graphs of the transmittance or reflectance of the filter devices to light as a function of the wavelength of the light waves.

As shown in fig. 3, the horizontal axis represents the wavelength of light and the vertical axis represents the transmittance. From the spectrum shown in fig. 3, the filter device corresponding to fig. 3 has a high transmittance for the optical signal in the wavelength range from point a to point B, and the rest of the wavelength ranges have only a very low transmittance, for example, the wavelength of the optical signal in point a may be 400nm, the wavelength of point B may be 500nm, and the wavelength from point a to point B may be the visible light range. Meanwhile, the device also has a reflectivity spectrum as shown in FIG. 4, wherein the horizontal axis is still the wavelength of light, the vertical axis is the reflectivity, and the 90% reflectivity is taken as a boundary, the filter has high reflectivity for the optical signals with the wavelength range from C point to D point, and simultaneously the optical signals with the wavelength range from A point to B point have extremely low reflectivity. Thus, the device can ensure that the optical signals with the wavelength range from A to B have high transmittance, and the optical wavelengths with the range from C point to D point have high reflectivity. The range from point C to point D does not intersect the range from point a to point B.

Alternatively, the wavelengths from the point C to the point D having high reflectance may be all longer than the wavelength of the point B as shown in fig. 4; alternatively, as shown in fig. 5, the range having a high reflectance may also be from point F to point E, each of which is smaller than the wavelength of point a; still alternatively, as shown in fig. 6 in conjunction with fig. 4 and 5, the range with high reflectivity may include C to D points and F to E points, where the C and D points have wavelengths greater than the B point and the E and F points have wavelengths less than the a point.

The filter device with different light transmission and reflection characteristics of different wave bands is matched with at least one sensor for use, so that different functions can be realized. For example, in the biometric device, the filter device is disposed around the sensor, so that the functions of allowing part of the optical signal to pass through the device, and reflecting and receiving and processing the other part of the optical signal in the other wavelength band by the sensor can be achieved; or the filter device can be arranged between the two sensors to realize the function that different sensors respectively collect and process the optical signals of different wave bands, thereby realizing the identification of biological characteristics.

Alternatively, as the first embodiment, the filter device and a sensor may be provided in the apparatus for biometric identification. Specifically, taking an optical fingerprint identification device in an electronic device as an example, fig. 7 and 8 are schematic diagrams illustrating an electronic device including the optical fingerprint identification device according to an embodiment of the present application, where fig. 7 is a top view of the electronic device, and fig. 8 is a side view of the electronic device.

As shown in fig. 7 and 8, the electronic device 200 may include a liquid crystal panel 210 and a backlight module 220, and an optical fingerprint recognition device is disposed between the liquid crystal panel 210 and the backlight module 220, the device including: a filter device 230 located in a display area of the electronic device, and an optical sensor assembly 240 located in a non-display area of the electronic device. The filter device 230 is configured to: transmitting the optical signal emitted from the backlight module 220 to the liquid crystal panel 210, reflecting a fingerprint optical signal, and transmitting the reflected fingerprint optical signal to the optical sensor assembly 240, wherein the reflective surface of the filter 230 faces the liquid crystal panel 210, the fingerprint optical signal is an optical signal returned from the liquid crystal panel 210 after the initial optical signal irradiates the finger above the liquid crystal panel 210, and the wavelength of the fingerprint optical signal is different from that of the optical signal emitted from the backlight module 220; the optical sensor assembly 240 is configured to: and receiving the fingerprint optical signal, wherein the fingerprint optical signal is used for fingerprint identification.

Optionally, the Light source used by the backlight module included in the electronic device 200 according to the embodiment of the present disclosure may be a Light Emitting Diode (LED for short).

It should be understood that, as shown in fig. 7, the upper surface of the electronic device 200 in the embodiment of the present application may be divided into a display area and a non-display area. The display area is an area where an image can be displayed, and the non-display area is an area where an image cannot be displayed, for example, an edge of the electronic device. For example, as shown in FIG. 7, where the non-display area of the lower edge of the electronic device is labeled 212, the electronic device 200 may include an optical sensor assembly 240 positioned below the non-display area 212.

In addition, the display area of the electronic device 200 may further include a fingerprint detection area 211 for indicating a position where a finger should touch during fingerprint recognition, wherein the position of the fingerprint detection area 211 may be set according to the optical path and the position of the optical sensor 240. When the user needs to unlock the electronic device or verify other fingerprints, the user can input the fingerprints only by pressing the finger in the fingerprint detection area 211. Because fingerprint detection can be realized in the screen, the electronic device 200 adopting the above structure does not need a special reserved space on the front surface thereof to set a fingerprint key (such as a Home key), so that a full-screen scheme can be adopted, that is, the display area of the electronic device 200 can be basically expanded to the front surface of the whole electronic device 200.

It should be understood that the filter device 230 in the embodiment of the present application is a filter device having high transmittance for part of light and high reflectance for part of light as described above. When fingerprint identification is required, a finger touches the fingerprint detection area 211, and an initial optical signal is irradiated to the finger above the liquid crystal panel 210 and then returns to a fingerprint optical signal through the liquid crystal panel 210, wherein the fingerprint optical signal carries fingerprint information of the finger or biological information such as blood. The reflective surface of the filter device 230 is disposed toward the liquid crystal panel 210, and the filter device 230 may reflect the returned fingerprint light signal to the optical sensor assembly 240; meanwhile, the filter 240 can transmit the optical signal emitted from the backlight module 220 to the liquid crystal panel 210 without affecting the normal display of the electronic device 200.

The wavelength of the fingerprint optical signal is different from that of the optical signal emitted from the backlight module 220, or the wavelength of the initial optical signal is different from that of the optical signal emitted from the backlight module 220, so that the filter 230 has high reflectivity for the fingerprint optical signal and high transmissivity for the light emitted from the backlight module. For example, as shown in fig. 3 to 6, the light emitted by the backlight module is visible light, and the fingerprint light signal or the corresponding initial light signal may be infrared light or ultraviolet light.

Alternatively, as shown in fig. 8, the filter device 230 may have a plate-like or sheet-like structure. The reflective surface of the filter device 230 may be parallel to the liquid crystal panel 210.

It should be understood that the optical sensor assembly 240 in the embodiments of the present application may include at least one optical sensor, or may also include other devices. For example, the optical sensor assembly 240 may be an optical sensor disposed in a position as shown in fig. 8, with a light-sensing surface perpendicular to the reflective surface of the filter device 230.

For another example, the optical sensor assembly 240 may further include an optical sensor and a reflection unit. As will be described in detail below in conjunction with fig. 9-12.

It should be understood that the electronic device 200 may also include a cover plate, such as the cover plate 250 shown in fig. 9-12. The cover plate is located above the liquid crystal panel 210, and can cover the front surface of the electronic device 200, so as to provide a touch interface for the finger. The cover plate may be a glass cover plate or a sapphire cover plate. In the embodiment of the present application, the pressing of the finger on the electronic device 200 actually means pressing on the cover plate or the surface of the protective layer covering the cover plate; moreover, the light path passes through the cover plate 250 while passing through the liquid crystal panel 210, and therefore, for brevity, the description is omitted.

Specifically, fig. 9 shows another schematic diagram of the electronic device according to the embodiment of the present application, where fig. 9 may be a side view of fig. 7, and may also be a specific implementation manner of fig. 8. As shown in fig. 9, the optical sensor assembly 240 includes a reflection unit 240 and an optical sensor 242, wherein the reflection unit 242 is located above the optical sensor 242, and a reflection surface of the reflection unit 241 faces a light-sensing surface of the optical sensor 242; the reflection unit 242 is configured to: receiving the fingerprint light signal reflected by the filter device 230 and reflecting the fingerprint light signal to the optical sensor 242; the optical sensor 242 is used for: receives the fingerprint light signal reflected by the reflection unit 241.

Alternatively, in order to achieve a better sensing effect of the optical sensor 242, the angles and positions of the reflection unit 241 and the optical sensor 242 may be adjusted. For example, as shown in fig. 9, the reflecting surface of the reflecting unit 241 may be disposed parallel to the light sensing surface of the optical sensor 242; alternatively, the reflecting surface of the reflecting unit 241 may be inclined at a predetermined angle with respect to the light receiving surface of the optical sensor 242. For another example, as shown in fig. 9, the reflecting surface of the filter device 230 may be parallel to the reflecting surface of the reflecting unit, wherein if the reflecting surface of the filter device 230 is parallel to the liquid crystal panel 210, the filter device 230, the reflecting unit 241 and the optical sensor 242 are all parallel to each other; alternatively, the non-parallelism of the respective portions may be adjusted, and the embodiment of the present application is not limited thereto.

It should be understood that the filter device 230 and the optical sensor may be disposed adjacent to each other as shown in fig. 9, in consideration of the size of the non-display area of the electronic device 200, and the like.

It should be understood that, since the wavelength of the initial light signal is different from the wavelength of the light signal emitted by the backlight module 220, the electronic device 200 in the embodiment of the present application may further include a light source for emitting the initial light signal to the finger. The light source is located below the liquid crystal panel 210, and the light source is located in a non-display area of the electronic device 200.

Alternatively, the light source may be located within the optical sensor assembly 240, or may not be included within the optical sensor assembly 240. As shown in fig. 9, taking the example of disposing the light source 243 inside the optical sensor assembly 240, the light source 243 may be disposed at any position in the structure of the optical sensor assembly 240. The light source 243 may be disposed on the circuit board 244. Specifically, the light source 243 may be disposed obliquely above the optical sensor 242 to prevent light emitted from the light source 243 from impinging on the light-sensing surface of the optical sensor 242; accordingly, the specific location of the optical sensor 242 within the optical sensor assembly 240 is also determined by the optical path requirements of the light source and the corresponding fingerprint light signal.

Alternatively, the light source may be disposed at a position outside the optical sensor assembly 240 and located at any position of the non-display area of the electronic device 200, which is not limited to this embodiment.

It should be understood that the light source emitting the initial light signal in the embodiments of the present application may be any type of light source, such as a laser light source, an infrared light source, and the like.

When the electronic device 200 needs to perform fingerprint identification, as shown in fig. 9, when a finger touches a fingerprint detection area on the surface of the electronic device 200, the light source 243 emits an initial light signal, and after the light signal irradiates the finger, a fingerprint light signal carrying effective information to return is generated at the finger, where the effective information may be fingerprint information or other biometric information of the finger; the optical signal is incident to the filter 230 through the liquid crystal panel 210; the filter 230 reflects the fingerprint light signal to the reflection unit 241, and the reflection unit 241 reflects the fingerprint light signal to the optical sensor 242, so as to perform fingerprint identification according to the fingerprint light signal.

In addition, when the electronic device 200 does not perform fingerprint identification, or in addition to the light path of the fingerprint optical signal during the fingerprint identification process, there may be light emitted from the backlight module 220, as shown in fig. 10, the light emitted from the backlight module 220 may directly pass through the filter 230 and be transmitted to the liquid crystal panel 210, so that the normal display of the electronic device 200 is not affected.

Optionally, in the embodiment of the present application, in order to make the fingerprint light signal reflected to the reflection unit 241, a transmission unit may be further provided in the optical sensor assembly 240. Specifically, fig. 11 shows a further schematic diagram of the electronic device according to the embodiment of the present application, where fig. 11 may be a side view of fig. 7, or may be a specific implementation manner of fig. 8. As shown in fig. 11, the optical sensor assembly 240 includes a reflection unit 241 and an optical sensor 242, and also includes a transmission unit 245. The transmission unit 245 is located in a light path between the filter device 230 and the reflection unit 241 to transmit the fingerprint light signal reflected by the filter device 230 to a reflection surface of the reflection unit 241.

Specifically, as shown in fig. 11, one surface of the transmission unit 245 faces the reflection surface of the filter device 230 to receive the fingerprint light signal reflected by the filter device 230, and the other surface of the transmission unit 245 faces the reflection surface of the reflection unit 241 to transmit the fingerprint light signal reflected by the filter device 230 to the reflection surface of the reflection unit 241.

Alternatively, the transmission unit 245 may be an optical imaging element, which may also be referred to as a lens. The transmission unit 245 may have a spherical or aspherical optical transmission structure for focusing incident light onto the reflection surface of the reflection unit 241. For example, the transmission unit 245 may be a single lens or a structure composed of a plurality of lenses. The lens of the transmission unit 245 may be generally formed of a resin material or a glass material.

Alternatively, the optical axis of the transmission unit 245 may be disposed parallel or nearly parallel to the reflection surface of the reflection unit 241 and/or the reflection surface of the filter device 230; alternatively, the optical axis of the transmission unit 245 may not be parallel to the reflection unit 241 and the filter device 230, and may be adjusted to a reasonable inclination angle according to the optical path, for example.

As shown in fig. 10, the optical axis of the transmission unit 245 is parallel to the reflection unit 241 and the filter 230, so that the light of the fingerprint optical signal transmitted by the transmission unit 245 is incident on the reflection surface of the reflection unit 241 as much as possible, the focusing of the fingerprint optical signal is improved, the omission of the light is avoided, the definition and integrity of the fingerprint image are ensured, and the accuracy of fingerprint detection is ensured.

Alternatively, providing the reflection unit 241, the optical sensor 242, and the transmission unit 245 as an integrated structure or module may effectively protect the reflection unit.

When the electronic device 200 needs to perform fingerprint identification, as shown in fig. 11, when a finger touches a fingerprint detection area on the surface of the electronic device 200, the light source 243 emits an initial light signal, and after the light signal irradiates the finger, a fingerprint light signal carrying effective information to return is generated at the finger, where the effective information may be fingerprint information or other biometric information of the finger; the optical signal is incident to the filter 230 through the liquid crystal panel 210; the filter 230 transmits the fingerprint light signal to the transmission unit 245, and then transmits the fingerprint light signal to the reflection unit 241 through the transmission unit 245, and the reflection unit 241 reflects the fingerprint light signal to the optical sensor 242, so as to perform fingerprint identification according to the fingerprint light signal.

In addition, similar to fig. 10, when the electronic device 200 does not perform fingerprint identification, or in addition to the optical path of the fingerprint optical signal during the fingerprint identification process, there may be light emitted from the backlight module 220, as shown in fig. 12, the light emitted from the backlight module 220 may directly pass through the filter 230 and be transmitted to the liquid crystal panel 210, so as not to affect the normal display of the electronic device 200.

Optionally, in the embodiment of the present application, since the filtering component 230 does not block the light emitted from the backlight module 220, the length of the backlight module 220 can reach the portion disposed below the filtering component 230; accordingly, since the optical sensor assembly 240 cannot transmit the light emitted from the backlight module 220, i.e., can block the light emitted from the backlight module 220, the length of the backlight module 200 may or may not reach the portion below the light source sensor assembly 240. For example, as shown in fig. 9 to 12, the length of the backlight module 220 may be set to be longer, including part or all of the optical sensor assembly 240; or, conversely, in order to save the length of the backlight module 220, the length of the backlight module 220 may also be set to include only the filter device 230 and not the optical sensor assembly 240 at all, and the embodiment of the present application is not limited thereto.

Similarly, the liquid crystal panel 210 is provided with a length to include an upper portion of the filter device 230, but may be provided with a portion including or not including an optical component. For example, as shown in fig. 9 to 12, the length of the liquid crystal panel 210 may be set to include part or all of the optical sensor assembly 240, for example, the length of the liquid crystal panel 210 may also be set to be equal to the length of the cover plate 250; alternatively, the length of the liquid crystal panel 210 may be saved, and the length of the liquid crystal panel 210 is set to include only the filter device 230 and not the optical sensor assembly 240 at all, which is not limited in the embodiments of the present application.

Therefore, electronic equipment in the embodiment of the application adopts the filter device that has high transmissivity to part light and has high reflectivity to part light, make the fingerprint light signal through this filter device received by optical sensor, this filter device can also be seen through to the light that backlight unit sent simultaneously, do not block the light that backlight unit sent, make this filter device place region no longer influence the demonstration, the width in non-display area has been shortened, can shorten the cell-phone black border to the cell-phone, increase cell-phone screen accounts for than.

Optionally, as a second embodiment, the filtering device and a plurality of sensors, for example, two sensors, may also be provided in the biometric identification apparatus. In particular, fig. 13 is a schematic diagram of another electronic device including an apparatus for biometric identification according to an embodiment of the present application, and fig. 13 is a side view of the electronic device.

As shown in fig. 13, the electronic device includes a display screen 310, and a biometric recognition apparatus is disposed below the display screen 310, and the biometric recognition apparatus includes: a filter device 320, a first optical sensor 330, and a second optical sensor 340. Specifically, the filter device 320 is configured to: reflecting a first optical signal in the fingerprint optical signals to the first optical sensor 330, and transmitting a second optical signal in the fingerprint optical signals to the second optical sensor 340, where the fingerprint optical signals are optical signals returned by the display screen after the initial optical signals irradiate the finger above the display screen, and the wavelengths of the first optical signal and the second optical signal are different; the first optical sensor 330 is used for: receiving the first optical signal reflected by the filter device 320; the second optical sensor 340 is used for: the second optical signal transmitted through the filter device 320 is received, and the first optical signal and the second optical signal are respectively used for biometric identification.

It should be understood that when the optical signal containing multiple bands reaches the filter device 320, a part of the optical signal satisfying the high reflectivity of the filter device 320 is reflected to reach the first optical sensor 330 through the filtering function of the filter device 320; another portion of the optical signal satisfying the high transmittance band of the filter device 320 is transmitted through the filter device 320 to the second optical sensor 340. At this time, since the first optical sensor 330 and the second optical sensor 340 respectively receive the optical signals of different wavelength bands, and different optical signals carry different information, the apparatus for biometric identification can simultaneously process the information carried by two different signals.

Alternatively, the first optical signal and the second optical signal may be used to perform different or the same biometric identification. For example, the biometric identification may include at least one of the following processes: fingerprint identification, heart rate detection, blood oxygen detection, blood pressure detection and living body identification.

Take the example that the light signal returned by the finger from the original light signal carries the finger information. When the primary optical signal with a longer wavelength range is transmitted to the vicinity of the optical sensor through the finger, the information carried by the first optical signal transmitted through the filter device 320 may include fingerprint information, and the information carried by the second optical signal reflected by the filter device 320 may include blood flow information, for example, the second optical signal is an optical signal returned after passing through the blood vessel 410 in the finger, and the first optical sensor 330 and the second optical sensor 340 may receive and process the image information of the fingerprint and the blood simultaneously through the optical signal selection function of the filter device 320.

Optionally, the first optical signal in this embodiment may be infrared light or ultraviolet light, and the second optical signal may be visible light; alternatively, the first optical signal may be visible light and the second optical signal may be infrared light or ultraviolet light.

Alternatively, according to the above-mentioned optical path, the light-sensing surface of the first optical sensor 330 and the light-sensing surface of the second optical sensor 340 may be arranged to be perpendicular to each other. For example, as shown in fig. 13, the light-sensing surface of the first optical sensor 330 is perpendicular to the display screen 310 and faces the reflecting surface of the filter device 320; the photosensitive surface of the second optical sensor 340 is parallel to and faces the display screen 310; the filter device 320 is located between the first optical sensor 330 and the second optical sensor 340. Considering the light path and the imaging effect, as shown in fig. 13, the included angle between the reflection surface of the filter device 320 and the photosensitive surface of the first optical sensor may be set to be equal to the included angle between the reflection surface of the filter device 320 and the photosensitive surface of the second optical sensor, i.e., 45 °.

It should be understood that the display screen 310 of the embodiment of the present application may be a display screen having a self-luminous display unit, such as an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. Taking the OLED display screen as an example, the display unit (i.e., OLED light source) of the OLED display screen 310 located in the fingerprint detection area can be used as a light source for emitting all or part of the initial light signal. When the finger 400 is pressed on the fingerprint detection area of the display screen 310, the display screen 310 emits a beam of light to the target finger 400 above the fingerprint detection area, and the light returns through the surface or the inside of the finger 400 and then returns through the display screen 310 to be a first optical signal or a second optical signal correspondingly.

Alternatively, the display screen 320 of the embodiment of the present application may further include a liquid crystal panel and a backlight module, and the device for biometric identification may be disposed between the liquid crystal panel and the backlight module, or disposed below the liquid crystal panel and the backlight module. In addition, the light emitted by the backlight module can also be used as a light source for emitting all or part of the initial light signal. However, when the biometric feature is identified and the finger presses the fingerprint detection area, light emitted from the backlight module returns through the surface or the inside of the finger 400 and returns through the liquid crystal panel to be a first optical signal or a second optical signal, but the embodiment of the present application is not limited thereto.

It should be understood that the electronic device may further include a cover plate positioned above the display screen 310 and covering the front surface of the electronic device for providing a touch interface for the finger. The cover plate may be a glass cover plate or a sapphire cover plate. In the embodiment of the present application, the pressing of the finger on the electronic device means that the finger is actually pressed on the cover plate or the surface of the protective layer covering the cover plate.

Optionally, a light source other than the display screen 310 may be provided in the electronic device for emitting all or part of the initial light signal. For example, the biometric device may be disposed in a non-display area of the electronic device, and the light source may be disposed in the non-display area, and the light source may be located inside or outside the biometric device, which is not limited in this embodiment.

For example, the light source may be embodied as an infrared light source, an ultraviolet light source, or a light source capable of emitting light of a specific wavelength. The light source can be arranged below the display screen or in the edge area below the protective cover plate of the electronic equipment, and the biological characteristic recognition device can be arranged below the display screen or the edge area of the protective cover plate and is guided by a light path so that the initial light signal emitted by the light source can reach the biological characteristic recognition device; alternatively, the biometric device may be disposed below the backlight module, and the backlight module may be perforated or otherwise optically designed to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the biometric device.

Therefore, the device for biometric feature recognition of the embodiment of the present application, through the filter device which is arranged between the two sensors and has high transmittance to part of light and high reflectivity to part of light, can realize the function that different sensors respectively collect and process light signals of different wave bands, thereby realizing the recognition of multiple biometric features at the same time, or performing different recognition of the same biometric feature, for example, also obtaining two fingerprint images at the same time.

It should be understood that for any of the optical sensors in the embodiments of the present application, such as the optical sensor included in the optical sensor assembly 240, or the optical sensors 330 and 340, the optical sensor may include a sensing array having a plurality of optical sensing units, and the sensing area of the sensing array is the light sensing surface of the optical sensor. The sensing array is specifically a Photo detector (Photo detector) array, which includes a plurality of Photo detectors distributed in an array, and the Photo detectors can be used as optical sensing units. The fingerprint detection area of the electronic equipment can be correspondingly determined according to the sensing array of the optical sensor.

For example, as shown in fig. 13, the area of the fingerprint detection area may be the same as or different from the area of the sensing array of the optical sensor 340. For example, between the optical sensor 340 and the filter device 320, the area of the fingerprint detection area may be larger than the area of the sensing array of the optical sensor 340 by the optical path design such as lens imaging, reflective folded optical path design, or other optical path design such as light convergence or reflection. For another example, if the optical sensor 340 and the filter device 320 are guided by light path in a manner of light collimation, the area of the fingerprint detection area may be designed to substantially coincide with the area of the sensing array of the optical sensor 340.

In addition, the optical sensor of the embodiment of the present application may further include a reading circuit electrically connected to the sensing array and other auxiliary circuits, which may be fabricated on a chip (Die) by a semiconductor process, such as an optical imaging chip or an optical fingerprint sensor.

It should be understood that, above the sensing array of the optical sensor, a light guide layer or a light path guide structure and other optical elements may be further disposed, for example, the light guide layer or the light path guide structure may be used to filter the ambient light penetrating through the finger, and the light guide layer or the light path guide structure is mainly used to guide the returned light signal to the sensing array for optical detection.

Alternatively, there are various implementations of the light guiding layer or so-called light path guiding structure. For example, the light guide layer may be specifically a Collimator (collimater) layer fabricated on a semiconductor silicon wafer, and has a plurality of collimating units or a micro-pore array, where the collimating units may be specifically small holes, and light rays from a finger returning light signal at a specific incident angle to the collimating unit may pass through and be received by an optical sensing unit below the collimating unit, while light rays at other incident angles are attenuated by multiple reflections inside the collimating unit, so that each optical sensing unit can basically only receive light signals returning at a preset angle, and thus the sensing array can detect a fingerprint image of the finger more accurately.

Optionally, the light guide layer or referred to as the light path guide structure may also be an optical Lens (Lens) layer, which has one or more Lens units, such as a Lens group composed of one or more aspheric lenses, for converging the light signal returned from the finger to the sensing array therebelow, so that the sensing array may perform imaging based on the light signal to obtain the fingerprint image of the finger. Optionally, the optical lens layer may further be formed with a pinhole in an optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to enlarge a field of view of the optical sensor, so as to improve a fingerprint imaging effect of the optical sensor.

Alternatively, the light guide layer or referred to as the optical path guide structure may also specifically employ a Micro-Lens (Micro-Lens) layer, the Micro-Lens layer has a Micro-Lens array formed by a plurality of Micro-lenses, which may be formed above the sensing array of the optical sensor through a semiconductor growth process or other processes, and each Micro-Lens may respectively correspond to one of the sensing units of the sensing array. And another optical film layer, such as a dielectric layer or a passivation layer, may be further formed between the microlens layer and the sensing unit, and more specifically, a light blocking layer having micro holes may be further included between the microlens layer and the sensing unit, where the micro holes are formed between the corresponding microlenses and the sensing unit, and the light blocking layer may block optical interference between the adjacent microlenses and the sensing unit, and enable light corresponding to the sensing unit to be converged inside the micro holes through the microlenses and transmitted to the sensing unit through the micro holes for optical fingerprint imaging.

It should be understood that several implementations of the above-described optical path directing structure may be used alone or in combination, for example, a microlens layer may be further disposed below the collimator layer or the optical lens layer. Of course, when the collimator layer or the optical lens layer is used in combination with the microlens layer, the specific stack structure or optical path thereof may need to be adjusted according to actual needs.

It should be understood that the optical sensor may be packaged in the same component as the light guide layer, for example, in the same optical fingerprint chip, or the light guide layer may be disposed outside the chip where the optical sensor is located, for example, the light guide layer is attached to the top of the chip, or some components of the light guide layer are integrated into the chip.

Optionally, the optical sensor may refer to an optical fingerprint sensor, and at this time, the area of the corresponding fingerprint detection area is small and the position is fixed, so that a user needs to press a finger to a specific position of the fingerprint detection area when performing fingerprint input, otherwise, the optical sensor may not acquire a fingerprint image, which results in poor user experience. Optionally, the optical sensor may specifically refer to an optical sensor in which a plurality of optical fingerprint sensors are integrated, the plurality of optical fingerprint sensors may be arranged side by side below the display screen or the liquid crystal panel in a splicing manner, and sensing areas of the plurality of optical fingerprint sensors jointly determine an area of a fingerprint detection area of the optical sensor.

That is, the fingerprint detection area of the electronic device may include a plurality of sub-areas, each sub-area corresponding to a sensing area of one of the optical sensors, so as to extend the fingerprint collection area to a main area of a lower half portion of the display screen, that is, to a region where a finger presses conventionally, thereby implementing a blind-touch fingerprint input operation. Alternatively, when the number of optical sensors is sufficient, the fingerprint detection area may also be extended to half or even the entire display area, thereby enabling half-screen or full-screen biometric detection.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It can be clearly understood by those skilled in the art that, for convenience and simplicity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (9)

1. An optical fingerprint identification device, wherein the device is located between a liquid crystal panel and a backlight module of an electronic device, the device comprising: a filter device located in a display area of the electronic device, a reflective surface of the filter device facing the liquid crystal panel, and an optical sensor located in a non-display area of the electronic device,

the filter device is used for: transmitting an optical signal emitted by the backlight module to the liquid crystal panel, reflecting a fingerprint optical signal, and transmitting the reflected fingerprint optical signal to the optical sensor, wherein the fingerprint optical signal is an optical signal returned by the liquid crystal panel after an initial optical signal irradiates a finger above the liquid crystal panel, the wavelength of the fingerprint optical signal is different from that of the optical signal emitted by the backlight module, the optical signal emitted by the backlight module is visible light, and the initial optical signal is infrared light or ultraviolet light;

the optical sensor is used for: receiving the fingerprint optical signal, wherein the fingerprint optical signal is used for fingerprint identification;

the device further comprises:

a light source for emitting the initial light signal to the finger, the light source being located below the liquid crystal panel, the light source being located in a non-display area of the electronic device;

a reflection unit located above the optical sensor in a non-display area of the electronic device, a reflection surface of the reflection unit facing a light-sensing surface of the optical sensor,

the reflection unit is used for: receiving the fingerprint light signal reflected by the filter device and reflecting the fingerprint light signal to the optical sensor;

the optical sensor is used for: receiving the fingerprint light signal reflected by the reflection unit;

the device further comprises a transmission unit for transmitting light,

the transmission unit is located the filter device with in the light path between the reflection unit to with what the filter device reflected fingerprint light signal transmission extremely the plane of reflection unit, the optical axis of transmission unit is on a parallel with the plane of reflection unit and/or the plane of reflection of filter device.

2. The apparatus of claim 1, wherein the reflective surface of the filter device is parallel to the liquid crystal panel.

3. The apparatus according to claim 1 or 2, wherein the reflecting surface of the reflecting unit is parallel to the light sensing surface of the optical sensor.

4. The apparatus of claim 3, wherein the reflecting surface of the filter device is parallel to the reflecting surface of the reflecting unit.

5. The apparatus of claim 4, wherein the filter device is adjacent to the optical sensor.

6. The apparatus according to claim 1 or 2, wherein one surface of the transmission unit faces the reflection surface of the filter device to receive the fingerprint light signal reflected by the filter device, and the other surface of the transmission unit faces the reflection surface of the reflection unit to transmit the fingerprint light signal reflected by the filter device to the reflection surface of the reflection unit.

7. The apparatus of claim 1 or 2, wherein the electronic device further comprises a cover plate located above the liquid crystal panel for providing a touch interface for the finger.

8. An electronic device, characterized in that the electronic device comprises an optical fingerprint recognition apparatus according to any one of claims 1-7.

9. Electronic device according to claim 8, characterized in that it is the electronic device as claimed in any of claims 1-7.

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