CN112380983A

CN112380983A - Fingerprint identification device and electronic equipment

Info

Publication number: CN112380983A
Application number: CN202011265739.7A
Authority: CN
Inventors: 兰洋; 沈健; 姚国峰
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2020-11-12
Filing date: 2020-11-12
Publication date: 2021-02-19
Anticipated expiration: 2040-11-12
Also published as: CN112380983B

Abstract

A fingerprint identification device and an electronic device can improve fingerprint identification performance. Fingerprint identification device is used for setting up in electronic equipment's display screen below, includes: a first optical device, a second optical device, and an optical fingerprint sensor; the first optical device is used for guiding a first target optical signal reflected by a finger on a first fingerprint detection area in the display screen to a first sensing array in the optical fingerprint sensor; the second optical device is used for guiding a second target optical signal reflected by a finger on a second fingerprint detection area in the display screen to a second sensing array in the optical fingerprint sensor; the first sensing array and the second sensing array are used for fingerprint identification according to the first target optical signal and the second target optical signal respectively; the first fingerprint detection area and the second fingerprint detection area are not overlapped with each other, and a spacing area exists between the first fingerprint detection area and the second fingerprint detection area.

Description

Fingerprint identification device and electronic equipment

Technical Field

The embodiments of the present application relate to the field of biometric identification technology, and more particularly, to a fingerprint identification device and an electronic device.

Background

Nowadays, biometric identification technology has been widely applied to various terminal devices, and especially in consumer electronics products such as smart phones, fingerprint identification has become a demand of the public. In recent years, with the rise of a full-screen mobile phone, the traditional capacitive fingerprint does not meet the full-screen requirement any more, and the technology for identifying the fingerprint under the screen is developed.

Optical fingerprint under the screen is as one kind of fingerprint under the screen, sets up it in the display screen below, through gathering optical fingerprint image to realize fingerprint identification. With the development of terminal devices, the performance requirements on fingerprint identification technology are higher and higher. Therefore, the performance of fingerprint identification is improved, and the method becomes a common technical target in the industry.

Disclosure of Invention

The embodiment of the application provides a fingerprint identification device and electronic equipment, and the fingerprint identification performance can be improved.

In a first aspect, a fingerprint identification device is provided, configured to be disposed below a display screen of an electronic device, and includes: a first optical device, a second optical device, and an optical fingerprint sensor; the first optical device is used for guiding a first target optical signal reflected by a finger on a first fingerprint detection area in the display screen to a first sensing array in the optical fingerprint sensor; the second optical device is used for guiding a second target optical signal reflected by a finger on a second fingerprint detection area in the display screen to a second sensing array in the optical fingerprint sensor; the first sensing array and the second sensing array are used for fingerprint identification according to the first target optical signal and the second target optical signal respectively; wherein, the first fingerprint detection area and the second fingerprint detection area are not overlapped with each other, and a spacing area is arranged between the first fingerprint detection area and the second fingerprint detection area.

In this application embodiment, through setting up first optical device and second optical device to light signal through different target direction gets into to optics fingerprint sensor in order to carry out fingerprint identification, compares in the fingerprint light signal of optics fingerprint sensor single orientation of only receiving, when promoting fingerprint identification signal's variety, can enlarge fingerprint identification device's visual field or reduce optics fingerprint sensor's area in order to reduce cost under the unchangeable condition of assurance visual field, thereby improve fingerprint identification performance or reduce fingerprint identification device's cost.

In some possible embodiments, in the optical fingerprint sensor, there is no space between the first sensing array and the second sensing array.

In some possible embodiments, the first sensor array and the second sensor array are equal in area, and/or the first fingerprint detection area and the second fingerprint detection area are equal in area.

In some possible embodiments, the first fingerprint detection area is located on one side of a boundary between the first sensing array and the second sensing array, and the second fingerprint detection area is located on the other side of the boundary between the first sensing array and the second sensing array.

In some possible embodiments, the first target light signal is directed towards the boundary line, and the first target light signal is at an angle θ with respect to a normal direction of the optical fingerprint sensor₁；

The second target optical signal is directed toward the boundary line and forms an angle θ with the normal direction of the optical fingerprint sensor₂(ii) a Wherein, theta₁And theta₂Is between 0 and 90 deg..

In some possible embodiments, θ₁＝θ₂The first optical device and the second optical device are arranged in a mirror image mode relative to a plane where a plane perpendicular to the display screen is located.

In some possible embodiments, the first optical device comprises a first inclined hole collimator, and the second optical device comprises a second inclined hole collimator; the direction of a plurality of first inclined holes in the first inclined hole collimator is the same as that of the first target optical signal; the direction of a plurality of second inclined holes in the second inclined hole collimator is the same as that of the second target optical signal.

In some possible embodiments, the first optical device comprises a first microlens array and at least one first aperture layer, and the second optical device comprises a second microlens array and at least one second aperture layer; a plurality of first light guide channels are formed in the at least one first diaphragm layer, and the directions of the plurality of first light guide channels are the same as the direction of the first target optical signal; a plurality of second light guide channels are formed in the at least one second diaphragm layer, and the directions of the plurality of second light guide channels are the same as the direction of the second target optical signal.

In some possible embodiments, at least a portion of the at least one first stop layer is a metal layer of the optical fingerprint sensor; and/or at least part of the at least one second diaphragm layer is a metal layer of the optical fingerprint sensor.

In some possible embodiments, the first optical device includes a first inclined-aperture collimator and a first microlens array, the first inclined-aperture collimator disposed over the first microlens array; the second optical device comprises a second inclined hole collimator and a second micro-lens array, and the second inclined hole collimator is arranged above the second micro-lens array.

In some possible embodiments, the first optical device comprises: a first microprism array and a first optical component; the first micro-prism array is used for receiving the first target optical signal and converting the first target optical signal into a first vertical optical signal vertical to the display screen; the first optical assembly is arranged below the first micro-prism array and used for receiving the first vertical light signal and guiding the first vertical light signal to the first sensing array of the optical fingerprint sensor; the second optical device includes: a second microprism array and a second optical component; the second micro-prism array is used for receiving the second target optical signal and converting the second target optical signal in the second optical signal into a second vertical optical signal vertical to the display screen; the second optical assembly is arranged below the second micro-prism array and used for receiving the second vertical light signal and guiding the second vertical light signal to the second sensing array of the optical fingerprint sensor.

In some possible embodiments, the first micro-prism array includes a plurality of first micro-prisms, the first micro-prisms include a first incident surface and a first exit surface, the first incident surface is a plane parallel to the display screen, and the first exit surface is a plane inclined to the display screen; the first micro prism is used for receiving the first target optical signal through the first incident surface and emitting the first target optical signal into the first vertical optical signal through the first emitting surface; the second micro prism array comprises a plurality of second micro prisms, each second micro prism comprises a second incident surface and a third emergent surface, the second incident surfaces are planes parallel to the display screen, and the third emergent surfaces are planes inclined to the display screen; the second micro prism is used for receiving the second target optical signal through the second incident surface and emitting the second target optical signal as the second vertical optical signal through the third emitting surface.

In some possible embodiments, the first micro-prism further comprises a second exit surface, the second exit surface being another plane inclined with respect to the display screen, the second exit surface having an area smaller than that of the first exit surface; the second micro prism also comprises a fourth emergent surface, the fourth emergent surface is another plane inclined relative to the display screen, and the area of the fourth emergent surface is smaller than that of the third emergent surface.

In some possible embodiments, the direction of the first target light signal is perpendicular to the edges of the first microprisms and the direction of the second target light signal is perpendicular to the edges of the second microprisms.

In some possible embodiments, the first and second micro-prism arrays are identical in structure and are arranged in a mirror image with respect to a plane perpendicular to the display screen.

In some possible embodiments, a first refracted light signal of the first target light signal after passing through the first incident surface is parallel to the second exit surface, an included angle between the first incident surface and the first exit surface is a first included angle i, an included angle between the first incident surface and the second exit surface is a second included angle j, and an included angle between the first target light signal and the incident surface is a target included angle θ; the first included angle i, the second included angle j,The refractive index n of the first microprism₁And the target angle θ satisfies the following formula:

n₀ sinθ＝n₁ sin(90°-j)；

n₁ sin(i+j-90°)＝n₀ sini；

wherein n is₀Is the refractive index of air.

In some possible embodiments, the first incident surface is further configured to receive a non-target optical signal reflected by a finger in a direction different from that of the first target optical signal; the first emergent surface and the second emergent surface are used for converting the non-target optical signal into an inclined optical signal inclined relative to the display screen; the optical component is used for blocking the inclined light signal so as to prevent the inclined light signal from entering the optical fingerprint sensor and causing interference to fingerprint identification.

In some possible embodiments, the angle between the non-target optical signal and the normal direction of the first incident surface is a non-target angle β, and the refractive index n of the first micro-prism₁And the non-target included angle β satisfies the following formula:

n₀ sinβ＝n₁ sin k；

n₁ sin(j-k)＝n₀ sin j；

wherein n is₀J is the included angle between the first incident surface and the second emergent surface, and k is the included angle between the second refracted light signal of the non-target light signal passing through the first incident surface and the normal direction.

In some possible embodiments, the refractive index n of the first microprisms₁And the first microprism is used for converting the non-target light signal in the value range into an inclined light signal.

In some possible embodiments, the refractive index of the first microprism array and/or the second microprism array is greater than 1.5.

In some possible embodiments, the first sensing array comprises a plurality of first optical sensing units, and the second sensing array comprises a plurality of second optical sensing units; at least one first optical sensing unit is correspondingly arranged below each first micro prism of the first micro prism array, and at least one second optical sensing unit is correspondingly arranged below each second micro prism of the second micro prism array; or, at least one first micro-prism is correspondingly arranged above each first optical sensing unit of the first sensing array, and at least one second micro-prism is correspondingly arranged above each second optical sensing unit of the second sensing array.

In some possible embodiments, a row of first optical sensing units or a column of first optical sensing units in the first sensing array is disposed below each first micro-prism of the first micro-prism array, and a row of second optical sensing units or a column of second optical sensing units in the second sensing array is disposed below each second micro-prism of the second micro-prism array.

In some possible embodiments, the first array of microprisms further comprises a first substrate layer, and the second array of microprisms further comprises a second substrate layer; the first substrate layer is formed above the first incidence surfaces of the first micro prisms, the second substrate layer is formed above the second incidence surfaces of the second micro prisms, and the first substrate layer and the second substrate layer are parallel to the display screen.

In some possible embodiments, the upper surface of the first substrate layer and the lower surface of the display screen are attached to each other, and/or the upper surface of the second substrate layer and the lower surface of the display screen are attached to each other.

In some possible embodiments, the first substrate layer and/or the second substrate layer are/is an optical filter for passing optical signals of a target wavelength band and blocking optical signals of a non-target wavelength band.

In some possible embodiments, at least one surface of the first microprism array is provided with an anti-reflective coating and/or a polarizing coating, and/or at least one surface of the second microprism array is provided with an anti-reflective coating and/or a polarizing coating; wherein the anti-reflection coating is used for reducing the reflectivity of the optical signal, and the polarization coating is used for selecting the polarization direction of the optical signal.

In some possible embodiments, the first micro-prism array and the second micro-lens array are disposed above the first optical assembly, the second optical assembly and the optical fingerprint sensor through a support structure disposed at an upper surface edge region of the optical fingerprint sensor.

In some possible embodiments, the first optical assembly and the second optical assembly include: a plurality of micro lenses in the micro lens array correspond to a plurality of optical sensing units in the optical fingerprint sensor one to one; at least one layer of diaphragm layer, which is arranged between the micro lens array and the optical fingerprint sensor, wherein each layer of diaphragm layer in the at least one layer of diaphragm layer is provided with a light through small hole corresponding to each optical sensing unit in the optical fingerprint sensor; the micro lens array is used for receiving the first vertical light signal and the second vertical light signal, and the first vertical light signal and the second vertical light signal are used for being transmitted to the optical fingerprint sensor through the light-passing small hole of the at least one diaphragm layer.

In some possible embodiments, at least a portion of the at least one aperture layer is a metal wiring layer of the optical fingerprint sensor.

In some possible embodiments, the first optical assembly and the second optical assembly are straight hole collimators, and each optical sensing unit in the optical fingerprint sensor corresponds to at least one collimating hole in the straight hole collimator; the straight-hole collimator is used for receiving the first vertical light signal converted by the first micro-prism array and the second vertical light signal converted by the second micro-prism array, and the first vertical light signal and the second vertical light signal are transmitted to the optical fingerprint sensor through a collimating hole in the straight-hole collimator.

In a second aspect, an electronic device is provided, comprising: a display screen and the fingerprint identification device of the first aspect or any one of the possible embodiments of the first aspect, wherein the fingerprint identification device is disposed below the display screen.

In some possible embodiments, the display screen is an organic light emitting diode OLED display screen, the display screen includes a plurality of OLED light sources, wherein the fingerprint identification device uses at least a portion of the OLED light sources as an excitation light source for fingerprint identification.

Drawings

Fig. 1 is a schematic view of an electronic device to which the embodiment of the present application is applicable.

Fig. 2 is a schematic cross-sectional view of the electronic device shown in fig. 1 along a direction a-a'.

Fig. 3 and 4 are schematic diagrams of two optical path guiding structures provided in the embodiments of the present application.

Fig. 5 is a schematic diagram of a fingerprint identification device according to an embodiment of the present application.

Fig. 6 is a schematic perspective view of the first microprism array of the fingerprint recognition apparatus of fig. 5.

Fig. 7 is a top view of the fingerprint identification device of fig. 5.

Fig. 8 is a schematic structural diagram of any first microprism in the first microprism array according to an embodiment of the present disclosure.

Fig. 9 is a schematic diagram illustrating a relationship between a refractive index of a first micro-prism and an angle of a non-target optical signal according to an embodiment of the present disclosure.

Fig. 10 is a schematic view of another fingerprint identification device according to an embodiment of the present application.

Fig. 11 is a schematic view of another electronic device to which the embodiment of the present application is applicable.

Fig. 12 is a schematic cross-sectional view of the electronic device shown in fig. 11 along the direction a-a'.

Fig. 13 and 14 are schematic views of fields of view in which the fingerprint identification device in the embodiment of the present application receives a single directional light signal and a plurality of directional light signals.

Fig. 15 to 18 are schematic views of another fingerprint identification device according to an embodiment of the present application.

Fig. 19 is a schematic perspective view of a first micro-prism array and a second micro-prism array according to an embodiment of the present disclosure.

Fig. 20 and 21 are schematic views of two other fingerprint identification devices provided in the embodiments of the present application.

Fig. 22 is a top view of the fingerprint identification device of fig. 18.

Fig. 23 is a schematic view of another fingerprint identification device according to an embodiment of the present application.

Detailed Description

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

The technical scheme of the embodiment of the application can be applied to various electronic devices. Such as portable or mobile computing devices, e.g., smart phones, laptops, tablets, gaming devices, etc., and other electronic devices, e.g., electronic databases, automobiles, Automated Teller Machines (ATMs), etc. However, the present embodiment is not limited thereto.

The technical scheme of the embodiment of the application can be used for the biological feature recognition technology. The biometric technology includes, but is not limited to, fingerprint recognition, palm print recognition, iris recognition, face recognition, and living body recognition. For convenience of explanation, the fingerprint identification technology is described as an example below.

It should be noted that, for convenience of description, like reference numerals denote like parts in the embodiments of the present application, and a detailed description of the like parts is omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the integrated device shown in the drawings are only exemplary and should not constitute any limitation to the present application.

Fig. 1 and 2 show schematic diagrams of an electronic device 10 to which embodiments of the application may be applied. Fig. 2 is a schematic cross-sectional view of the electronic device 10 shown in fig. 1 along a direction a-a'.

As shown in fig. 1 and 2, the electronic device 10 may include a display 100 and a fingerprint recognition device 200.

The display panel 100 may be a self-luminous display panel that employs display cells having self-luminous properties as display pixels. For example, the display screen 100 may be an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. In other alternative embodiments, the Display screen 100 may also be a Liquid Crystal Display (LCD) or other passive light emitting Display screen, which is not limited in this embodiment of the present application. Further, the display screen 100 may also be specifically a touch display screen, which not only can perform image display, but also can detect a touch or pressing operation of a user, so as to provide a human-computer interaction interface for the user. For example, in one embodiment, the electronic device 10 may include a Touch sensor, which may be embodied as a Touch Panel (TP), which may be disposed on a surface of the display screen 100, or may be partially or wholly integrated within the display screen 100, so as to form the Touch display screen.

Referring to fig. 2, the fingerprint recognition device 200 includes an optical fingerprint sensor 220, the optical fingerprint sensor 200 includes a sensing array 221 having a plurality of optical sensing units (also referred to as light sensing pixels, pixel units, etc.) for implementing photoelectric conversion, by way of example, the sensing array 221 is embodied as a Photo Diode (PD) array. The sensing array 221 is located in or has a sensing area that is a fingerprint detection area 201 (also referred to as a fingerprint collection area, a fingerprint identification area, etc.) of the fingerprint identification device 200. It is understood that the optical fingerprint sensor 220 further includes a reading circuit electrically connected to the sensing array 221 and other auxiliary circuits, which can be fabricated on a chip (Die) by a semiconductor process.

Wherein, the fingerprint recognition device 200 is disposed in a partial region below the display screen 100. Referring to fig. 1, a fingerprint detection area 201 may be located in a display area of the display screen 100.

Referring to fig. 2, the fingerprint recognition device 200 may further include an optical assembly. The optical component may be disposed above the optical fingerprint sensor 220, and may specifically include a Filter layer (Filter) for filtering ambient light penetrating through the finger, a light guide layer or light path guiding structure 210 for guiding reflected light reflected from the surface of the finger to the sensing array 221 for optical detection, and other optical elements.

In some embodiments of the present application, the optical component may be packaged in the same optical fingerprint chip as the optical fingerprint sensor 220, or the optical component may be disposed outside the chip where the optical fingerprint sensor 220 is located, for example, the optical component is attached above the chip, or some components of the optical component are integrated in the chip.

In some embodiments of the present application, the sensing array 221 of the fingerprint identification device 200 is located in an area or a sensing range corresponding to the fingerprint detection area 201 of the fingerprint identification device 200. The fingerprint detection area 201 of the fingerprint identification device 200 may be equal to or not equal to the area or the light sensing range of the area where the sensing array 221 of the fingerprint identification device 200 is located, which is not specifically limited in the embodiment of the present application.

For example, the fingerprint sensing area 201 of the fingerprint recognition device 200 may be designed to substantially correspond to the area of the sensing array 221 of the fingerprint recognition device 200 by light path guidance through light collimation.

For another example, the area of the fingerprint sensing area 201 of the fingerprint recognition device 200 may be larger than the area of the sensing array 221 of the fingerprint recognition device 200 by using an optical path design such as lens imaging, a reflective folded optical path design, or other optical path designs such as light convergence or reflection.

Next, a fingerprint recognition process of the fingerprint recognition device 200 in the embodiment of the present application will be described with reference to fig. 2.

As an example, the display screen 100 in fig. 2 is a display screen employing a display unit having self-light emission, and the display screen 100 includes a display assembly 120. For example, the display screen 100 is an OLED display screen and the display assembly 120 is an OLED light source. The fingerprint recognition device 200 can use the OLED light source of the OLED display screen 100 in the fingerprint detection area 201 as the excitation light source for optical fingerprint detection. When the finger 140 is pressed against the fingerprint detection area 201, the display 100 emits a beam of light to the finger 140 above the fingerprint detection area 201, which is reflected on the surface of the finger 140 to form reflected light or scattered light (transmitted light) by being scattered inside the finger 140. In the related patent application, the above-mentioned reflected light and scattered light are collectively referred to as reflected light for convenience of description. Because the ridges (ridges) and the valleys (valley) of the fingerprint have different light reflection capacities, the reflected light from the ridges and the valleys of the fingerprint have different light intensities, and after passing through the optical assembly, the reflected light is received by the sensing array 221 in the fingerprint identification device 200 and converted into corresponding electrical signals, i.e., fingerprint detection signals; based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, so that an optical fingerprint identification function is realized in the electronic device 10.

In other alternatives, the fingerprint identification device 200 may also use an internal light source or an external light source to provide an optical signal for fingerprint detection and identification. In this case, the fingerprint recognition device 200 may be applied not only to a self-luminous display such as an OLED display but also to a non-self-luminous display such as a liquid crystal display or other passive luminous display.

In particular implementations, the display screen 100 may also include a transparent protective cover plate 110, and the cover plate 110 may be a glass cover plate or a sapphire cover plate that covers the front surface of the electronic device 10. Therefore, in the embodiment of the present application, the pressing of the finger on the display screen 100 actually means pressing on the cover plate 110 or the surface of the protective layer covering the cover plate 110.

As shown in fig. 2, the optical path guiding structure 210 in the optical assembly is used to guide the optical signal of the reflected light passing through the finger 140 to the sensing array 221 at a specific angle, which may be the optical signal obliquely incident to the sensing array 221 as shown in fig. 2 or the optical signal perpendicularly incident to the sensing array 221.

It should be noted that, if the light path guiding structure 210 is capable of guiding the light rays obliquely incident at a predetermined angle and reflected by the finger to the sensing array 221 of the optical fingerprint sensor 220. Since the light path guiding structure 210 employs an inclined light path and the reflection intensity of the obliquely incident light is higher than that of the perpendicularly incident light, the imaging contrast of the optical fingerprint sensor 220 is improved and the thickness of the fingerprint recognition device 200 is greatly reduced.

Specifically, the optical path guiding structure 210 may adopt various structures to realize the inclined optical path. The light path guiding structure 210 is exemplarily described below with reference to fig. 3 and 4.

In some embodiments, as shown in fig. 3, the optical path guiding structure 210 is an optical Collimator employing a through hole array with a high aspect ratio, and the optical Collimator may be embodied as a Collimator (collimater) layer fabricated on a semiconductor silicon wafer, and has a plurality of collimating units, and the collimating units may be embodied as straight holes or inclined holes. Optionally, the collimator layer is an inclined hole collimator, and an axial direction of the collimating unit in the inclined hole collimator may be inclined with respect to the sensing array 221 in the optical fingerprint sensor 220. Of the reflected light reflected by the finger, the light rays incident on the collimating unit at a specific angle can pass through and be received by the sensor chip below the collimating unit, and the light rays at other incident angles are attenuated by multiple reflections inside the collimating unit.

In the embodiment of the present application, an angle between the direction of the inclined hole in the middle inclined hole collimator and the direction of the normal line of the sensing array 221 may be preset to be

Therefore, the sensor array 221 can only receive the finger reflection light with an incident angle of

Or is close to

The oblique optical signal of (1).

However, in the solution shown in fig. 3, the attenuation of the optical signal by the inclined-hole collimator is large, which not only blocks the incident angle from being equal to

Also blocks part of the incident angle of

Or is close to

The inclined optical signal of (2), and the process for manufacturing the inclined hole collimator 210 is relatively complex, the manufacturing difficulty is high, and the inclined hole collimator is not suitable for large-scale production.

In other embodiments, as shown in fig. 4, the optical path directing structure 210 includes a microlens 211, at least one stop layer 212 disposed below the microlens 211, and one or more optical sensing units in the sensing array 221 are disposed below the lowermost stop layer 212.

Incident angle of

The reflected light of the finger passes through the micro lens 211 and is converged to the light passing aperture in the diaphragm layer 212 and transmitted to the optical sensing unit in the optical fingerprint sensor 220 through the light passing aperture in at least one of the diaphragm layers 212. And the incident angle is not

The finger reflection light is converged by the micro-lens 211 to the non-transparent material in the diaphragm layer 212, and is absorbed or reflected by the non-transparent material, so as to block the incident angle from being

The light reflected by the finger enters the optical sensing unit, and the non-light-transmitting material includes, but is not limited to, a black matrix material.

Referring to fig. 4, in order to achieve the above function, if at least one of the diaphragm layers 212 is a multi-layer diaphragm layer 212, the center of the light-passing aperture in one or more of the diaphragm layers 212 is disposed offset from the focal point of the microlens, and in some embodiments, one optical sensing unit corresponds to one microlens and is disposed directly below the microlens, the center of the light-passing aperture in the diaphragm layer 212 is disposed offset from the central axis of the optical sensing unit, which is a straight line passing through the center of the optical sensing unit and perpendicular to the optical sensing unit. It is understood that if the at least one aperture layer 212 is a single aperture layer 212, the center of the light passing aperture of the aperture layer 212 is located off-center from the focal point of the microlens.

The aperture size of the light-transmitting aperture in the diaphragm layer determines the angular range of the incident light that can pass through

Only the incident angle is

To

The finger reflected light within the range can reach the optical sensing unit. The combination of the micro-lenses 211 and at least one diaphragm layer 212 can realize the angle screening of the incident light, and the incident light of the non-target angle is blocked by the non-transparent material.

However, when it comes to receiving high angle optical signals (e.g. angle of incidence)

Greater than 30 degrees), in the scheme shown in fig. 4, a partial region of the microlens 211 (e.g., the region 2111 in fig. 4) cannot exert a converging action due to a shadow effect (lens shading effect). Therefore, the fingerprint identification device 200 may receive a large amount of light when receiving a large angle of oblique incident light, and therefore, the exposure time of the optical fingerprint sensor 220 must be prolonged to obtain a sufficient amount of signal, which may result in a long fingerprint identification time and affect the user experience.

In addition, as shown in fig. 4, the large-angle light signal may be blocked by the light-absorbing material in at least one of the stop layers 212, which further causes the loss of light energy, and is not favorable for the performance and efficiency of fingerprint identification.

Based on this, the embodiment of the application provides a fingerprint identification device, can solve the light loss problem that above-mentioned fingerprint identification device 200 exists when receiving wide-angle incident light to shorten fingerprint identification device's exposure time, accelerated fingerprint identification's speed and promoted user experience. In addition, the fingerprint identification device can be applied to detection of various fingers, especially can be applied to detection of dry fingers, and improves fingerprint identification performance of the dry fingers.

The embodiment of the application is suitable for the display screen below in order to realize optical fingerprint detection under the screen. Fig. 5 shows a schematic diagram of a fingerprint recognition device 300 according to an embodiment of the present application. The fingerprint recognition device 300 may be applied to the electronic device 10 shown in fig. 1 and 2, i.e., under the display screen 100.

As shown in fig. 5, the fingerprint recognition device 300 may include: a first microprism array 310, an optical component 320, and an optical fingerprint sensor 330;

the first micro-prism array 310 may include a plurality of first micro-prisms (micro-prisms). The first microprism is a triangular prism structure and comprises a first incident surface 301 and a first emergent surface 302, wherein the first incident surface 301 is a plane parallel to the display screen 100, and the first emergent surface 302 is a plane inclined to the display screen 100;

the first micro prism is used for receiving a first target optical signal 11 which is reflected by a finger and is inclined relative to the display screen 100 through a first incident surface 301, and emitting the first target optical signal 11 as a first vertical optical signal 12 which is vertical relative to the display screen 100 through a first emitting surface 302;

the optical assembly 320 is disposed below the first micro-prism array 310 for receiving the first vertical light signal 12 and guiding the first vertical light signal 12 to the optical fingerprint sensor 330, and the optical fingerprint sensor 330 is disposed below the optical assembly 320 for receiving the first vertical light signal 12 for fingerprint recognition.

In the embodiment of the application, the first target light signal inclined relative to the display screen is converted into the first vertical light signal vertical to the display screen through the plurality of first micro prisms in the first micro prism array, the first vertical light signal is transmitted to the optical fingerprint sensor through the optical component for fingerprint identification, and light loss caused when large-angle incident light is transmitted in a light path can be reduced, so that the exposure time of the fingerprint identification device is shortened, the fingerprint identification speed is increased, and the user experience is improved. In addition, the fingerprint identification device can be applied to detection of various fingers, especially can be applied to detection of dry fingers, and improves fingerprint identification performance of the dry fingers.

Optionally, as shown in fig. 5, the first micro-prisms in the first micro-prism array 310 further include a second exit surface 303, the second exit surface 303 is another plane inclined with respect to the display screen 100, and optionally, the area of the second exit surface 303 is smaller than the area of the first exit surface 302.

Compared with the case that the second emergent surface is arranged to be a plane vertical to the display screen, or the second emergent surface is vertical to the first incident surface, in the embodiment of the application, the second emergent surface is arranged to be another plane inclined to the display screen, that is, the second emergent surface is inclined to the first incident surface, so that the processing and the manufacturing of the first micro prism can be facilitated, the tolerance in the manufacturing process can be increased, and the production efficiency of the first micro prism can be improved.

Specifically, in order to satisfy the condition that the first target optical signal 11 is emitted as the first vertical optical signal 12 from the first emitting surface 302 after passing through the first micro prism, the direction of the first target optical signal 11 may satisfy the condition that, firstly, the first target optical signal 11 needs to be perpendicular to the edge of the first micro prism, secondly, the first target optical signal 11 and the first incident surface 301 form a certain inclination angle, and thirdly, the first target optical signal 11 received by the first incident surface 301 is only emitted toward the first emitting surface 302, but not toward the second emitting surface 303.

In some embodiments, the first refraction optical signal after the first target optical signal 11 passes through the first incident surface 301 is parallel to the second exit surface 303. In other words, the first target optical signal 11 does not exit from the second exit surface 303 after passing through the first micro prism.

As an example, fig. 6 shows a schematic perspective view of the first microprism array 310 of fig. 5.

As shown in fig. 6, each of the first microprisms in the first microprism array 310 has the same structure and is connected to each other, wherein the first incident surface 301 of each of the first microprisms is on the same plane, the first exit surface 302 of each of the first microprisms is parallel to each other, and the second exit surface 303 of each of the first microprisms is parallel to each other.

Alternatively, the first micro-prism array 310 may be made of a transparent material with a high refractive index, and preferably, the refractive index of the material of the first micro-prism array 310 is higher than 1.5, which may be manufactured by a process such as nano-imprinting or gray-scale lithography.

Specifically, in the embodiment of the present application, the optical fingerprint sensor 330 includes a sensing array 331 formed by a plurality of optical sensing units, and the related technical features of the sensing array 331 and the optical sensing units thereof can be referred to the above description of the sensing array 221 and the optical sensing units thereof, and are not described herein again.

Specifically, in the embodiment of the present application, the optical component 320 is configured to guide the first vertical optical signal 12 converted by the first micro-prism array 310 to the optical sensing unit in the sensing array 331 for fingerprint identification, and block the oblique optical signal after passing through the first micro-prism array 310, so that the oblique optical signal cannot reach the sensing array 331, thereby avoiding interference with fingerprint identification, and improving fingerprint identification effect.

As an example, the optical assembly 320 shown in fig. 5 includes: a microlens array 321 and at least one aperture layer 322 disposed thereunder (e.g., two aperture layers 322 shown in fig. 5). The aperture layer 322 is formed of a non-light transmissive material, including but not limited to black glue, in which a plurality of light transmissive apertures are disposed.

As shown in fig. 5, the microlens array 321 is disposed below the first microprism array 310 and includes a plurality of microlenses;

at least one layer of diaphragm layer 322 is arranged between the micro-lens array 321 and the sensing array 331, and each layer of diaphragm layer 322 in the at least one layer of diaphragm layer 322 is provided with a plurality of light-passing small holes corresponding to a plurality of optical sensing units;

the sensing array 331 is for receiving the light signal converged by the microlens array 321 and transmitted through the light passing aperture of the at least one aperture layer 322. Or, the micro lens array 321 is configured to converge the first vertical optical signal 12, which is reflected by the finger and converted by the first micro prism array 310, to the light-passing aperture in the at least one diaphragm layer 322, and the first vertical optical signal 12 is converged by the micro lens array 321 and then transmitted to the sensing array 331 through the light-passing aperture in the at least one diaphragm layer 322. And, the microlens array 321 is used to converge the oblique optical signals passing through the first microprism array 310 to a non-light-passing aperture region, i.e. a non-light-transmitting material region, in at least one of the stop layers 322, and the non-light-transmitting material absorbs or reflects the oblique optical signals to block the oblique optical signals from being transmitted to the sensing array 331.

As an example, as shown in fig. 5, a plurality of microlenses in the microlens array 321 correspond to a plurality of optical sensing units in the sensing array 331 one to one, and in each layer of the diaphragm layer 322, a plurality of light-passing apertures correspond to a plurality of optical sensing units one to one, that is, the light-passing apertures and the optical sensing units in each layer of the diaphragm layer 322 are disposed directly below one microlens.

As an example, fig. 7 shows a top view of the fingerprint recognition device 300 of fig. 5.

As shown in fig. 7, in the first micro-prism array 310, a row of micro lenses in the micro lens array 321 is disposed under each first micro prism, and it can be understood that a row of photo sensing units is disposed under the row of micro lenses. Of course, in other words, a row of microlenses in the microlens array 321 may be correspondingly disposed below each first microprism.

As shown in fig. 5 and 7, the first micro-prisms 310a in the first micro-prism array 310, the first micro-lenses 321a in the micro-lens array 321, and the first optical sensing units 331a in the sensing array 331 are correspondingly disposed, and the first micro-lenses 321a are configured to receive the first vertical optical signals converted by the first micro-prisms 310a, converge the first vertical optical signals to the first optical sensing units 331a through the light-passing apertures in the two layers of diaphragm layers, and block other oblique optical signals through the light-absorbing material regions in the two layers of diaphragm layers.

Compared with the scheme shown in fig. 4, the first micro-prism array 310 converts the first target optical signal which is reflected by the finger and inclines relative to the display screen into the first vertical optical signal which is vertical relative to the display screen, and then the micro-lens and the diaphragm layer are used as optical components to guide the converged first vertical optical signal to enter the sensing array, so that other inclined optical signals are blocked, the micro-lens in the micro-lens array does not have a shadow area, and the signal quantity and the fingerprint identification effect which can be received by the sensing array 331 are improved. In addition, no matter how large the angle of the first target optical signal incident to the target tilt direction of the first microprism array 310 is, the first microprism array 310 can be converted into a vertical optical signal, which will not cause the optical signal to be blocked by the light absorbing material in the aperture layer, i.e. will not cause the loss of optical energy.

It should be understood that the first micro-prism array 310 of the present application may be set to receive only the reflected light signal from the finger incident in the target oblique direction, i.e., the first target light signal 11. The finger reflected light incident in the target oblique direction is changed into a vertical light signal, i.e., a first vertical light signal 12, after passing through the first micro-prism array 310. The vertical optical signal is absorbed by the corresponding optical sensing unit after passing through the optical assembly 320 and converted into a corresponding electrical signal according to a certain ratio to be output. Because the light intensity of the reflected light from the fingerprint valleys is greater than that of the reflected light from the fingerprint ridges, the electric signals output by the acquisition units corresponding to the valleys are stronger, and the images are brighter; the electric signal output by the acquisition unit corresponding to the ridge is weak, the image is dark, and finally a clear fingerprint image with certain contrast is output. The reflected light incident in the non-target oblique direction is still an oblique light signal after passing through the first micro-prism array 310, and the oblique light signal is converged to the light absorption material area in the diaphragm layer by the micro-lens and cannot reach the optical sensing unit for fingerprint imaging.

The structure of the first microprism in the embodiment of the present application is described below with reference to fig. 8, and the principle of converting the first target optical signal 11 reflected by a finger into the first vertical optical signal 12 is described.

Fig. 8 is a schematic diagram illustrating a structure of any one of the first microprisms of the first microprism array 310 and a change in direction of light according to an embodiment of the present disclosure.

As shown in fig. 8, the angle between the first target optical signal 11 and the normal direction (hereinafter referred to as the normal direction) perpendicular to the first incident surface 301 is θ, the first target optical signal 11 enters the first micro prism from the first incident surface 301 and forms a first refracted optical signal 101 therein, and the first refracted optical signal 101 forms an angle of 90 ° -j with the normal direction; if the angle between the first incident surface 301 and the first exit surface 302 is a first angle i, and the angle between the first incident surface 301 and the second exit surface 303 is a second angle j, the second exit surface 303 of the first microprism is parallel to the first refracted light signal 101, i.e. the first refracted light signal 101 cannot exit from the second exit surface 303.

For example, in fig. 8, if the first target light signal 11 is further emitted as the first vertical light signal 12 from the first emitting surface 302 of the first micro prism, the included angle θ, the first included angle i, and the second included angle j need to satisfy the following relation:

n₀ sinθ＝n₁ sin(90°-j)；

n₁ sin(i+j-90°)＝n₀ sin i；

wherein n is₀Is the refractive index of air, n₁The refractive index of the microprisms.

Further, the width L and the height h of the first microprism and the projection width d of the first exit surface 302 on the first incident surface 301 satisfy the following relation:

h＝d tan i；

L-d＝h tan(90°-j)；

as an example, if the angle θ is 25 °, i.e. the first target light signal is 25 ° of oblique light, the refractive index n of air is₀1, refractive index n of microprism₁At 1.7, the second angle j is calculated to be about 75.6 °, the first angle i is calculated to be about 33.2 °, the width d is about 0.86L, and the height h is about 0.56L. The width L of the first microprism is not limited herein, but only the shape of the side surface of the first microprism is a triangle in which two included angles are 33.2 ° and 75.6 °. Optionally, the range of the width L of the first microprismThe circumference may be 1um to 50 um.

Taking the above parameters as an example, the first microprism thus configured can produce the following effects: the first emergent surface 302 can convert 25-degree incident light into vertical emergent light, so that an optical signal reaching the fingerprint sensor is converted into a vertical optical signal; incident light of two, 25 ° cannot be emitted from the second emission surface 303; the third and second emitting surfaces 303 are also unlikely to emit vertical light signals.

As a third point shown below by using the inverse method, assuming that the second emitting surface 303 can emit the vertical optical signal 102, the vertical optical signal 102 is derived from the second refracted optical signal 103 inside the microlens, and an included angle between the second refracted optical signal 103 and the normal direction is k, the second included angle j and the included angle k satisfy the following relation:

n₁sin(j-k)＝n₀sinj；

If the second angle j is 75.6 deg., n₀Is 1, n₁At 1.7, k is calculated to be about 40.9 °, i.e. the angle of the second refracted light signal 103 to the normal direction is 40.9 °, and the angle q of the refracted light signal that can actually appear inside the microprism with the largest angle to the normal direction is:

i.e. q is about 36 deg. and 40.9 deg. >36 deg., so that the second refracted light signal 103 is not present, i.e. the perpendicular light signal 102 is not present either, it is not possible for the second exit face 303 to emit any perpendicular light signal, which can only emit oblique light signals.

Above with the refractive index n of the first microprisms₁In fig. 1.7, the case of the optical signals emitted from the first emission surface 302 and the second emission surface 303 of the first microprism is described by taking the example where the angle θ of the first target optical signal is 25 °. In summary, in order to make the first emitting surface 301 emit the first target light signal as the first vertical light signal in the vertical direction, the first target light is emittedThe signal does not exit from the second exit surface 302, the first angle i between the first incident surface 301 and the first exit surface 302, the second angle j between the first incident surface 302 and the second exit surface 303, and the refractive index n of the first microprism₁The angle θ to the first target optical signal should satisfy the following relation:

n₀sinθ＝n₁sin(90°-j)；

n₁sin(i+j-90°)＝n₀sini；

wherein n is₀Is the refractive index of air.

Further, the first incident surface 301 of the first microprism is also used for receiving a non-target optical signal having a different direction from the first target optical signal 11, and the first and second exit surfaces 302 and 303 are used for converting the non-target optical signal into an oblique optical signal.

In order for the second emission surface 303 to emit the non-target light signal as an oblique light signal, not a vertical light signal, the incident angle of the non-target light signal and the refractive index n of the first microprism₁And (4) correlating.

In some embodiments, as shown in fig. 8, the second refracted light signal 103 is a light signal formed after the non-target light signal 13 passes through the first incident surface 301, and an angle between the non-target light signal 13 and the normal direction is a non-target angle β. Refractive index n of first microprism₁The angle β to the non-target optical signal should satisfy the following relation:

n₀ sinβ＝n₁ sin k；

n₁ sin(j-k)＝n₀ sin j；

wherein n is₀J is an angle between the first incident surface 301 and the second exit surface 302, and k is an angle between the second refracted light signal 103 and the normal direction.

Obtaining the refractive index n of the first microprism according to the relational expression₁The relationship with the angle beta of the non-target optical signal is shown in FIG. 9Wherein the first region is n satisfying the condition₁And a range region of beta, the second region being n not satisfying the condition₁And the range region of β.

As shown in FIG. 9, if the refractive index n of the first microprism is large₁Within a certain range, e.g. refractive index n₁Between 1.5 and 1.9, if the refractive index n₁The larger the refractive index n₁The larger the value range of the angle beta of the corresponding non-target optical signal is, at the moment, more non-target optical signals can be converted into oblique optical signals, so that the condition that only the first target optical signal is converted into the vertical optical signal through the first incident surface and the first emergent surface is met, and the fingerprint imaging quality and the fingerprint identification effect are improved.

In other words, in some embodiments, the refractive index n of the first microprisms₁The first microprism is used for converting non-target light signals in the larger value range into inclined light signals, so that the fingerprint imaging quality and the fingerprint identification effect are improved.

Preferably, the refractive index n of the first microprisms₁If the angle beta is larger than or equal to 1.9, all the non-target optical signals with the angle beta ranging from 0 degrees to 90 degrees can be converted into oblique optical signals, so that the fingerprint imaging quality and the fingerprint identification effect are further improved.

In fig. 9, when β is 0 °, the refractive index n of the first microprism in the first region is set to be equal to₁Is around 1.5, and by way of example, the minimum may range within 1.5 ± 0.1; similarly, corresponding to β being 90 °, in the first region, the refractive index n of the first microprism₁Is around 1.9, and may range, as an example, within 1.9 ± 0.1.

As can be seen from the above description of the first micro-prisms, in the embodiments of the present application, by setting the structure and the refractive index of the first micro-prisms, the vertical light signal can only be emitted from the first emitting surface of the first micro-prisms, and the vertical light signal only originates from the first target light signal, that is, originates from the first refracted light signal, and the second emitting surface is parallel to the first refracted light signal, so that the direction of the reflected light signal reflected by the second emitting surface is different from that of the first refracted light signal, and the reflected light signal cannot be emitted from the first emitting surface as the vertical light signal.

If the second exit surface is set to be a plane perpendicular to the display screen, or the second exit surface is set to be a plane perpendicular to the first entrance surface, there may be a portion of stray light signals with a direction different from that of the first target light signal, which enter the first micro prism, and then are reflected by the perpendicular second exit surface to form a reflected light signal with a direction the same as that of the first refracted light signal, and the reflected light signal is transmitted to the first exit surface and is refracted by the first exit surface to form a perpendicular light signal to exit, which interferes with fingerprint identification. Therefore, the first microprism of the embodiment of the application can reduce the interference of stray light to fingerprint identification and improve the performance of fingerprint identification.

Fig. 10 shows a schematic diagram of another fingerprint recognition device 300.

As shown in FIG. 10, the fingerprint recognition device 300 may further include a first substrate layer 340, where the first substrate layer 340 is formed over the first micro-prism array 310 and is disposed parallel to the display screen. In preparing to form first array of microprisms 310, first array of microprisms 310 can be formed over a first substrate layer 340, the first substrate layer 340 being configured to support the first array of microprisms 310.

Optionally, the first substrate layer 340 is a light transmissive material, which may be the same material as the first array of microprisms 310 or may be a different material than the first array of microprisms 310.

In some embodiments, the first substrate layer 340 may be a white glass or resin material.

In other embodiments, the first substrate layer 340 can be a filter that transmits only optical signals in a target wavelength band and blocks optical signals in a non-target wavelength band. As an example, the first substrate layer 340 may be an infrared cut filter (IR cut filter).

The optical filter is used to reduce unwanted ambient light in the fingerprint sensing to improve the optical sensing of the received light by the sensing array 331. The filter may specifically be used to filter out light of a particular wavelength, e.g., near infrared light and portions of red light, etc. For example, a human finger absorbs most of the energy of light with a wavelength below 580nm, and if one or more optical filters or optical filter layers are designed to filter light with a wavelength from 580nm to infrared, the effect of ambient light on the optical detection in fingerprint sensing can be greatly reduced.

For example, the optical filter may include one or more optical filters, which may be configured to: such as a band pass filter to allow transmission of light emitted by the OLED screen while blocking other light components such as infrared light in sunlight. Such optical filtering may effectively reduce background light caused by sunlight when the fingerprint recognition device 300 of the embodiment of the present application is used outdoors. In addition, the light inlet surface of the optical filter can be provided with an optical inorganic coating or an organic blackening coating, so that the reflectivity of the light inlet surface of the optical filter is lower than a first threshold value, for example, 1%, and therefore the induction array 331 can be ensured to receive enough optical signals, and the fingerprint identification effect is further improved.

It should be understood that, in the embodiment of the present application, in addition to being disposed above the first micro-prism array 310 as the first substrate layer 340, the optical filter may be fabricated at any position along the optical path from the reflected light formed by the reflection of the finger to the sensing array 331, which is not specifically limited in this embodiment of the present application. In other words, in the fingerprint recognition device 300 of the embodiment of the present application, the first substrate layer 340 may be a transparent layer, and besides, the fingerprint recognition device 300 further includes a filter.

As an example, the filter may be disposed at any of the following positions: above the first microprism array 310; between first microprism array 310 and optical assembly 320; the interior of the optical assembly 320; and between the optical assembly 320 and the sensing array 331. For example, the optical filter may be disposed between the first micro-prism array 310 and the optical assembly 320, and the optical filter is configured to receive the first vertical optical signal converted by the first micro-prism array 310, so that light loss of the first vertical optical signal in the optical filter is effectively reduced, and the fingerprint identification effect is further improved. For another example, the optical filter may be disposed on the surface (on chip) of the optical fingerprint sensor 330, so that the optical fingerprint sensor 330 may be directly disposed on the surface without an additional supporting structure for the optical filter, thereby reducing the overall thickness of the fingerprint identification device 300.

Optionally, as shown in fig. 10, in addition to the sensing array 331, the optical fingerprint sensor 330 may further include at least one metal layer 332 and a first dielectric layer 333 between the metal layers. The metal layer 332 may be a metal wiring layer of the optical fingerprint sensor, and is used for electrically interconnecting the optical sensing units in the sensing array 331 and electrically connecting the sensing array 331 to an external device, so as to implement internal and external communication of the fingerprint identification device 300.

As an example, as shown in fig. 10, the optical fingerprint sensor 330 may include three metal layers 332, and a first dielectric layer 333 may be disposed between the three metal layers 332 and between the metal layer 332 at the lowermost layer and the sensing array 331, and the material of the first dielectric layer 333 may be a transparent material, which may be, for example, silicon oxide, silicon nitride, or the like.

It will be appreciated that in addition to the microlens array 321 and the at least one aperture layer 322, the optical assembly 320 includes a second medium layer 323, the second medium layer 323 being used to connect the microlens array 321, the at least one aperture layer 322, and the optical fingerprint sensor 330. The material of the second dielectric layer 323 is also a transparent material for transmitting an optical signal, and the embodiment of the present application is not limited to a specific type of the transparent material.

It should be noted that in the embodiment of the present application, at least one metal layer 332 in the optical fingerprint sensor 330 may be multiplexed as the diaphragm layer 322 in the optical component 320, that is, a light-passing aperture is formed in the metal layer 332 to serve as a diaphragm, so as to simplify the structure and reduce the thickness of the fingerprint identification device 300.

Optionally, the top metal layer 332 of the optical fingerprint sensor 330 is reused as a diaphragm layer, the optical component 320 includes two diaphragm layers, the top diaphragm layer is used for blocking interference of ambient light and stray light on fingerprint identification, and the bottom diaphragm layer is the top metal layer of the optical fingerprint sensor 330 and is used for further blocking stray light and guiding a vertical light signal to be transmitted to the sensing array 331, so as to improve an imaging effect of the optical fingerprint sensor and improve fingerprint identification performance.

Optionally, the apertures of the at least one light-passing aperture layer corresponding to the same microlens are sequentially reduced from top to bottom. For example, as shown in fig. 10, the aperture of the light passing aperture provided in the top layer diaphragm layer is larger than the aperture of the light passing aperture provided in the bottom layer diaphragm layer.

Of course, the aperture of the light-passing aperture in at least one of the diaphragm layers corresponding to the same microlens may be the same from top to bottom, which is not limited in this application.

It should be noted that fig. 10 only shows a technical solution in which the top metal layer 332 of the optical fingerprint sensor 330 is multiplexed as the diaphragm layer, and in addition, the metal layer 332 at any position in the optical fingerprint sensor 330 may be multiplexed as the diaphragm layer. For example, the metal layer 332 in the optical fingerprint sensor 330 at the top, middle, or bottom position may be multiplexed as a diaphragm layer.

In addition, in addition to multiplexing the metal layer 332 of the optical fingerprint sensor 330 as a diaphragm layer, one or more layers may be disposed on the diaphragm layer in the optical assembly 320. The optical component 320 may be disposed above the optical fingerprint sensor 330, or may be integrated with the optical fingerprint sensor 330 on the same chip, so as to further reduce the thickness of the fingerprint identification device 40 and avoid occupying space of other modules (e.g., a battery) in the electronic device.

In the above embodiment, the optical assembly 320 includes a micro lens array and at least one stop layer for guiding the vertical light signal to the sensing array 331 in the optical fingerprint sensor 330. Besides, the optical component 320 may also be a straight hole collimator, and each optical sensing unit in the optical fingerprint sensor 331 corresponds to at least one straight hole in the straight hole collimator; the straight-hole collimator is configured to receive the first vertical optical signal converted by the first microprism array and transmit the first vertical optical signal to the optical fingerprint sensor 330 through a collimating hole in the straight-hole collimator.

In the above embodiments shown in fig. 5 and 10, the width of the first microprism in the first microprism array 310 (see parameter L in fig. 8) is the same as or similar to the width of the optical sensing unit in 331 in the photosensitive array, and in addition, the width of the first microprism in the first microprism array 310 may also be the same as or similar to the diameter of the circular microlens in the microlens array 321.

Of course, the width of the first micro-prism may also be smaller or larger than the width of the optical sensing unit in 331 of the photosensitive array, in other words, one micro-lens in the micro-lens array 321 may receive optical signals converted by a plurality of micro-prisms, or a plurality of micro-lenses in the micro-lens array 321 may receive optical signals converted by the same micro-prism, and the width of the micro-prism is not specifically limited in the embodiment of the present application.

Optionally, each first micro-prism in the first micro-prism array 310 is disposed corresponding to at least one micro-lens in the micro-lens array 321 and at least one optical sensing unit in the sensing array 331. The at least one microlens and the at least one optical sensing unit are correspondingly arranged below the first microprism, the at least one microlens is used for receiving the optical signal converted by the first microprism, and the at least one optical sensing unit is used for receiving the optical signal converged by the at least one microlens.

Alternatively, each microlens in the microlens array 321 and each optical sensing unit in the sensing array 331 are disposed corresponding to at least one first microprism in the first microprism array 310. The optical sensing unit is used for receiving the optical signal converged by the micro lens.

As shown in the foregoing embodiments, the fingerprint identification apparatus is configured to receive a light signal from a single target direction, and block stray light from other directions, so as to improve the fingerprint identification effect. However, in this embodiment, only receiving the optical signal in a single direction may result in a limited field of view of the fingerprint identification device, and if the field of view of the fingerprint identification device is enlarged, the area of the fingerprint identification chip is increased, which may result in an increase in the cost of the fingerprint identification device.

Therefore, how to increase the field range of the fingerprint identification device, or reduce the area of the fingerprint identification device and the cost of the fingerprint identification device on the premise of keeping the same field range becomes a technical problem to be solved urgently.

Fig. 11 and 12 show schematic views of an electronic device 20 to which the embodiment of the present application can be applied. Fig. 12 is a schematic cross-sectional view of the electronic device 20 shown in fig. 11 along the direction a-a'.

As shown in fig. 11 and 12, the electronic device 20 may include the display 100 and a fingerprint recognition device 400 provided by the embodiment of the present application. Specifically, the display screen 100 in the embodiment of the present application may refer to the related schemes in the above embodiments, and details are not repeated here.

In the embodiment of the present application, the fingerprint recognition device 400 may include: a first optical device 410a, a second optical device 410b, and an optical fingerprint sensor 420;

the first optical device 410a is used for guiding a first target light signal reflected by a finger on the first fingerprint detection area 401a in the display screen 100 to the first sensing array 421a in the optical fingerprint sensor 420;

the second optical device 410b is used for guiding a second target light signal reflected by a finger on a second fingerprint detection area 401b in the display screen 100 to a second sensing array 421b in the optical fingerprint sensor 420;

the first sensing array 421a and the second sensing array 421b are used for performing fingerprint identification according to the first target optical signal and the second target optical signal, respectively;

the first fingerprint detection area 401a and the second fingerprint detection area 401b are not overlapped with each other, and a spacer 401c is arranged between the first fingerprint detection area 401a and the second fingerprint detection area 401b, so that an optical signal reflected by a finger above the spacer 401c cannot enter the optical fingerprint sensor 420 for fingerprint identification.

Optionally, in this embodiment of the application, related technical features of the optical fingerprint sensor 420, the first sensing array 421a, and the second sensing array 421b may refer to the technical solutions of the optical fingerprint sensor 220, the optical fingerprint sensor 330, the sensing array 221, or the sensing array 331, which are not described herein again.

As an example, as shown in fig. 12, the display screen 100 is an OLED display screen, the display screen 100 emits a light beam to the finger 140 above the first fingerprint detection area 401a, the light beam is reflected on the surface of the first area of the finger 140 to form a first reflected light, the first optical device 410a is configured to guide a first target light signal in the first reflected light to the first sensing array 421a, and the first sensing array 421a is configured to perform photoelectric conversion according to the first target light signal to obtain a first fingerprint detection signal. Similarly, the display screen 100 emits a light beam to the finger 140 above the second fingerprint detection area 401b, the light beam is reflected on the surface of the second area of the finger 140 to form a second reflected light, i.e. a second target light signal, the second optical device 410b is configured to guide the second target light signal in the second reflected light to the second sensing array 421b, the second sensing array 421b is configured to perform photoelectric conversion according to the second target light signal to obtain a second fingerprint detection signal, fingerprint image data can be obtained based on the first fingerprint detection signal and the second fingerprint detection signal, and fingerprint matching verification can be further performed, so as to implement an optical fingerprint identification function in the electronic device 20.

It is understood that, in the embodiment of the present application, the directions of the first target optical signal and the second target optical signal are optical signals in any two different directions, and the first target optical signal and the second target optical signal are respectively an optical signal perpendicular to the display screen and an optical signal oblique to the display screen, or both the first target optical signal and the second target optical signal are optical signals oblique to the display screen.

Alternatively, as shown in fig. 12, in the optical fingerprint sensor 420, there is no space between the first sensing array 421a and the second sensing array 421 b.

Compare in adopting two optics fingerprint sensor 420 to receive the light signal that comes from two fingerprint detection area respectively, adopt the mode of this application embodiment, can utilize two not spaced response array regions to receive the light signal that comes from two fingerprint detection area respectively among the same optics fingerprint sensor, the technology of being convenient for is realized, and can reduce the horizontal space that fingerprint identification device took in the display screen below.

Optionally, in this embodiment, the areas of the first sensing array 421a and the second sensing array 421b are equal, and/or the areas of the first fingerprint detection area 401a and the second fingerprint detection area 401b are equal.

Preferably, in some embodiments, the first fingerprint detection area 401a is located on one side of a boundary between the first sensing array 421a and the second sensing array 421b, and the second fingerprint detection area 401b is located on the other side of the boundary between the first sensing array 421a and the second sensing array 421 b.

As an example, as shown in fig. 12, the first sensing array 421a and the second sensing array 421b have the same area, a boundary of the first sensing array 421a and the second sensing array 421b is a symmetry axis of the optical fingerprint sensor, the first fingerprint detection area 401a is located at one side of the symmetry axis, and the second fingerprint detection area 401b is located at the other side of the symmetry axis.

Specifically, as shown in fig. 12, the first target light signal is inclined to a boundary between the first sensing array 421a and the second sensing array 421b, or the first target light signal is transmitted toward the boundary, and an angle θ between the first target light signal and a normal direction of the optical fingerprint sensor is an angle₁(ii) a The second target optical signal is inclined to the above-mentioned boundary line,or the second target optical signal, is transmitted towards the boundary line, and the second target optical signal forms an angle theta with the normal direction of the optical fingerprint sensor₂. To facilitate distinguishing the directions of the first target optical signal and the second target optical signal, an angle between the second target optical signal and the normal direction of the optical fingerprint sensor may be written as- θ₂Wherein, theta₁And theta₂Is between 0 and 90 deg..

Alternatively, theta₁＝θ₂The first optical device 410a and the second optical device 410b are arranged in a mirror image with respect to a plane passing through the boundary line and perpendicular to the display screen. Further, the first fingerprint detection area 401a and the second fingerprint detection area 401b may be arranged in a mirror image with respect to the plane passing through the boundary line and perpendicular to the display screen.

As an example, if in the embodiments of the present application, θ₁＝θ₂When the distance from the surface of the optical fingerprint sensor to the surface of the display screen is 1mm, the width of the spacer 401c is about 0.93mm, i.e. the first fingerprint detection area 401a is separated from the second fingerprint detection area 401b by a width of 0.93 mm.

It will be appreciated that the fingerprint sensing area of the fingerprint identification device is located in its field of view, and in some embodiments, the fingerprint sensing area is the same as the area of the field of view of the fingerprint identification device in the plane of the display screen. For the purpose of directional description, the following field of view refers to the field of view of the fingerprint identification device in the plane of the display screen.

Fig. 13 and 14 are schematic views showing fields of view in which the fingerprint identification device in the embodiment of the present application receives a single directional light signal and a plurality of directional light signals.

As shown in fig. 13 (a) and 14 (a), the fingerprint recognition device 200 is configured to receive a unidirectional optical signal for fingerprint recognition, the fingerprint recognition device 200 may be the fingerprint recognition device 200 shown in fig. 2, and the field of view of the fingerprint recognition device 200 is a first field of view. As shown in fig. 13 (b) and 14 (b), the fingerprint recognition device 400 is used for receiving light signals from two directions for fingerprint recognition, the fingerprint recognition device 400 may be the fingerprint recognition device 400 shown in fig. 12, and the field of view of the fingerprint recognition device 400 is the second field of view.

Comparing fig. 13 and (a) and (b) in fig. 14, it can be seen that the second field of view is capable of collecting more fingerprint information in the finger edge area than the first field of view, the overall field of view of the fingerprint identification device 400 is larger than that of the fingerprint identification device 200, and the field angle of the second field of view is larger than that of the first field of view by θ₁+θ₂The field width of the second field is enlarged by the width of the spacer 401c compared to the field width of the first field, and the fingerprint recognition signal has more diversity. In other words, if the overall field of view of the fingerprint identification device 400 is set to the first field of view, the area of the optical fingerprint sensor in the fingerprint identification device 400 is correspondingly reduced, thereby reducing the cost of the fingerprint identification device.

For example, if θ₁＝θ₂Assuming that the first field of view is 6 × 6mm, if the optical fingerprint sensor receives only the optical signal in a single direction, the light sensing area of the optical fingerprint sensor corresponds to the size of 1:1 in the first field of view, and the area is 6 × 6mm, if the optical fingerprint sensor receives the optical signal in the angle θ₁First target optical signal and angle-theta₂The area of the photosensitive area of the second target optical signal is (6-0.93) × 6mm, that is, 5.07 × 6mm, the area of the photosensitive area of the optical fingerprint sensor is reduced by about 15%, and the cost of the optical fingerprint sensor can be reduced by 10% to 15% corresponding to the reduction of the total area of the optical fingerprint sensor by 10% to 15%.

In practical product application, a fingerprint signal of a central area pressed by a finger is fuzzy frequently, the fingerprint signal is equivalent to a useless signal, and technicians can adopt some technical means to eliminate the fingerprint fuzzy as much as possible; generally speaking, when the fingerprint is unlocked, most of the fingers can be pressed in the central area of the fingerprint identification area, and if the central area pressed by the fingers just falls in the interval area or most of the central area falls in the interval area, the central fuzzy phenomenon can be effectively avoided, and meanwhile, the effective area of the fingerprint identification area is not influenced.

Therefore, adopt the technical scheme of this application embodiment, on the one hand, can increase fingerprint identification device's visual field or reduce cost, promote the variety of fingerprint identification signal in order to improve fingerprint identification performance, on the other hand, can not gather the useless fingerprint light signal of finger central zone, simplify fingerprint image processing's process in order to improve fingerprint identification's efficiency.

Fig. 15 to 17 show three kinds of schematic structural diagrams of the first optical device 410a and the second optical device 410b in the embodiment of the present application.

As shown in fig. 15, the first optical device 410a includes a first inclined-hole collimator; the second optical device 410b includes a second inclined-hole collimator.

Wherein, optics fingerprint sensor 420 and display screen parallel arrangement, the direction contained angle of first inclined hole direction in the first inclined hole collimater and optics fingerprint sensor 420's normal is theta₁That is, the direction of the first inclined hole is the same as or similar to the direction of the first target optical signal, the first sensing array 421a in the optical fingerprint sensor 420 can only receive the incident angle θ₁Or near theta₁The oblique optical signal of (1). Similarly, the direction of the second inclined hole in the second inclined hole collimator makes an angle of- θ with the direction of the normal of the optical fingerprint sensor 420₂That is, the direction of the second inclined hole is the same as or similar to the direction of the second target optical signal, the second sensing array 421b in the optical fingerprint sensor 420 can only receive the incident angle of- θ₂Or near-theta₂The oblique optical signal of (1).

As shown in fig. 16, the first optical device 410a includes a first microlens array and at least one first aperture layer, and the second optical device 410b includes a second microlens array and at least one second aperture layer. Alternatively, the related technical solutions of the first optical device 410a and the second optical device 410b can be referred to the related description of the optical assembly 210 shown in fig. 4 above.

The first optical device 410a and the second optical device 410b have the same structure and composition, and only differ in the arrangement of the light-passing apertures in at least one of the stop layers, so as to achieve the target light signals passing through different directions.

Taking the second optical device 410b as an example, the second optical device 410b includes a second microlens array 410b and at least one second aperture layer 412b, a plurality of light-passing apertures are disposed in the at least one second aperture layer 412b to form a plurality of second light-guiding channels in a second direction, so as to guide a second target light signal to be transmitted to the second sensing array 421b, and incident light in a non-second direction is blocked by a non-light-transmitting material in the at least one second aperture layer 412 b. In other words, the direction of the plurality of second light guide channels is the same as or similar to the direction of the second target optical signal.

Optionally, a plurality of microlenses in the second microlens array 410b correspond to a plurality of optical sensing units in the second sensing array 421b one to one, that is, one optical sensing unit is correspondingly disposed below one microlens, and the optical sensing unit is configured to receive the second target optical signal that is converged by the microlens and passes through the light-passing aperture in at least one second aperture layer. In order to allow the second target optical signal in the oblique direction to pass through, the center of the light passing aperture in the one or more second aperture layers 412 is disposed off the optical axis of the microlens.

Optionally, the optical sensing unit may be correspondingly disposed right below one microlens, or may also correspond to an oblique lower side of one microlens, so that the second target optical signal is focused on a central position of the optical sensing unit, so as to improve a light blocking problem of the metal wiring layer above the optical sensing unit.

In the embodiment of the present application, at least part of the aperture layers in the first optical device 410a and the second optical device 410b may be served by metal layers in the optical fingerprint sensor 420, in other words, one or more metal wiring layers in the optical fingerprint sensor 420 may be multiplexed into one or more aperture layers to select a target light signal to pass through, which may simplify the structure of the fingerprint identification device 400 and reduce the thickness thereof.

Furthermore, it is understood that in the present embodiment, the fingerprint recognition device 400 further includes other optical structures, such as a transparent medium layer, for connecting at least one of the diaphragm layer, the micro-lens array and the optical fingerprint sensor. For another example, the optical fingerprint sensor may further include a filter layer disposed in an optical path between the sensing array of the optical fingerprint sensor and the display screen, for filtering out optical signal bands of non-fingerprint detection. Specifically, the filter layer, the transparent dielectric layer, and the metal wiring layer in the optical fingerprint sensor 420 may be referred to the related description in fig. 10, and are not described herein again.

As shown in fig. 17, the first optical device 410a includes a first inclined-hole collimator disposed over a first microlens array and the first microlens array; the second optical device 410b includes a second inclined-hole collimator disposed over a second microlens array and the second microlens array.

Specifically, in the embodiment of the present application, the inclined-hole collimator may be as described in relation to fig. 15 above, and the microlens array is configured to converge the first target optical signal and the second target optical signal after passing through the inclined-hole collimator to the first photosensitive array 421a and the second photosensitive array 421 b.

It can be understood that, in the embodiment of the present application, since the inclined-hole collimator is disposed above the optical fingerprint sensor to block stray light in other directions except for the target direction, a diaphragm layer does not need to be separately disposed below the microlens array, and only the microlens array needs to be formed above the optical fingerprint sensor 420.

It is understood that, in the above application embodiments, the first optical device 410a and the second optical device 410b may be according to requirements, i.e. the angle θ of the first target optical signal₁And angle theta of the second target optical signal₂To design the specific optical path structure.

In the embodiment shown in fig. 15 and 17, the inclined hole collimator blocks not only the non-target light signal but also part of the target light signal, and only the target light signal passing through the inclined hole is received by the optical fingerprint sensor. This solution therefore causes a significant loss of the optical signal.

In the embodiment shown in fig. 16, in order to satisfy the passing of the target optical signal, the light-passing aperture of at least one of the stop layers needs to be shifted by a proper distance with respect to the optical axis of the microlens, and if the optical sensing unit is disposed directly below the microlens, this results in that part of the light rays converged by the microlens may be blocked or absorbed by the non-light-transmitting material of at least one of the stop layers, for example, the metal wiring layer of the optical fingerprint sensor. In addition, due to the inclined light path, a partial area of the micro lens cannot play a role of converging light due to a shadow effect, so that when the optical fingerprint sensor receives incident light with a large angle, the light loss is large.

Therefore, according to the scheme, the fingerprint signal acquisition can be completed only by emitting light with higher intensity by the light source or prolonging the exposure time of the fingerprint sensor, and adverse effects are caused on equipment power consumption and user experience.

Based on this, refer to fingerprint identification device 300 in the above, can in the fingerprint identification device 400 of the embodiment of this application, set up the microprism array equally, in order to convert slope light signal into perpendicular light signal, perpendicular light signal passes through optical assembly transmission again and carries out fingerprint identification to the optics fingerprint sensor in, can reduce the light loss of slope light path, thereby the exposure time of fingerprint identification device has been shortened, increase the visual field of fingerprint identification device or reduce cost, when promoting the variety of fingerprint identification signal, accelerate fingerprint identification's speed and promoted user experience.

Fig. 18 shows a schematic view of another fingerprint recognition device 400.

As shown in fig. 18, in the fingerprint recognition device 400, the first optical device 410a includes: a first micro-prism array 413a and a first optical assembly;

the first micro-prism array 413a is configured to receive a first target light signal and convert the first target light signal into a first vertical light signal vertical to the display screen;

the first optical assembly is disposed below the first micro-prism array 413a, and is configured to receive the first vertical light signal and guide the first vertical light signal to a first sensing array 421a of the optical fingerprint sensor;

the second optical device 410b includes: a second micro-prism array 413b and a second optical assembly;

the second micro-prism array 413b is configured to receive the second target light signal and convert the second target light signal in the second light signal into a second vertical light signal vertical to the display screen;

the second optical assembly is disposed below the second micro-prism array 413b and is configured to receive the second vertical light signal and guide the second vertical light signal to the second sensing array 421b of the optical fingerprint sensor.

In the present embodiment, the first micro-prism array 413a and the first optical assembly in the first optical device 410a may have the same structure as the first micro-prism array 310 and the optical assembly 320 in the fingerprint recognition device 300. In addition, the first sensing array 421a of the optical fingerprint sensor 420 may be the same as the sensing array 311 of the fingerprint identification device 300, and for a specific technical solution, reference may be made to the related description above, and details are not repeated here.

And the second micro-prism array 413b of the second optical device 410b may be symmetrically disposed with respect to the first micro-prism array 413a, i.e., the second micro-prism array 413b receives an angle of- θ₂Of the second target optical signal. As an example, the second micro-prism array 413b includes a plurality of second micro-prisms including a second incident surface and a third exit surface, the second incident surface being a plane parallel to the display screen, and the third exit surface being a plane inclined to the display screen; the second micro prism is used for receiving the second target optical signal through the second incident surface and emitting the second target optical signal into a second vertical optical signal through the third emitting surface.

Optionally, the second micro-prism further includes a fourth exit surface, the fourth exit surface is another plane inclined with respect to the display screen, and an area of the fourth exit surface is smaller than an area of the third exit surface.

Specifically, in the embodiment of the present application, the first target light signal received by each first micro-prism in the first micro-prism array 413a and the normal of the first incident surface of the first micro-prismThe angle of the direction is theta₁The included angle between the first micro prism and the edge of the first micro prism is 90 degrees; and the angle between the second target optical signal received by each second micro-prism in the second micro-prism array 413b and the normal direction of the second incident surface of the second micro-prism is θ₂The included angle between the second micro prism and the edge of the second micro prism is 90 degrees; wherein, theta₁And theta₂Is between 0 and 90 deg..

Alternatively, if θ₁＝θ₂The second micro-prism array 413b and the first micro-prism array 413a are arranged in a mirror image with respect to a plane perpendicular to the display screen.

Fig. 19 shows a schematic perspective view of a first micro-prism array 413a and a second micro-prism array 413 b.

As shown in fig. 19, any first micro-prism in the first micro-prism array 413a includes a first incident surface 301, a first emergent surface 302 and a second emergent surface 303, and the related technical solutions of the first incident surface 301, the second emergent surface 302 and the second emergent surface 303 can be referred to the above description.

Any one of the second micro prisms in the second micro prism array 413b includes a second incident surface 401, a third emergent surface 402 and a fourth emergent surface 403, and specifically, the second incident surface 401 may be located on the same plane as the first incident surface 301. The technical features related to the third exit surface 402 can be referred to in the above description related to the first exit surface 302, and the technical features related to the fourth exit surface 403 can be referred to in the above description related to the second exit surface 303.

In some embodiments, as shown in fig. 18 and 19, the first and second

micro-prism arrays

413a and 413b have the same structure and are arranged in mirror symmetry with respect to a plane perpendicular to the display screen.

In other embodiments, as shown in fig. 20, the first micro-prism array 413a and the second micro-prism array 413b may have different structures and be arranged in a mirror-image asymmetrical manner.

In other embodiments, as shown in fig. 21, the first and second

micro-prism arrays

413a and 413b have different structures and are arranged in a non-mirror image.

Optionally, as shown in fig. 18, 20, and 21, the first micro-prism array 413a further includes a first substrate layer 414a, and the second micro-prism array 413b further includes a second substrate layer 414 b;

the first substrate layer 414a is formed on the top surface of a plurality of first microprisms and the second substrate layer 414b is formed on the top surface of a plurality of second microprisms, the first and

second substrate layers

414a and 414b being parallel to the display screen 110.

Alternatively, first substrate layer 414a and/or second substrate layer 414b may be optical filters configured to pass optical signals in a target wavelength band and block optical signals in a non-target wavelength band.

The related technical solutions of the first substrate layer 414a and the second substrate layer 414b can be referred to the related description of the first substrate layer 340, and are not described herein again.

Optionally, in the present embodiment, at least one surface of the first micro-prism array 413a is provided with an anti-reflection coating and/or a polarization coating, and/or at least one surface of the second micro-prism array 413b is provided with an anti-reflection coating and/or a polarization coating; among them, the anti-reflection coating is used to reduce the reflectivity of the optical signal, and the polarization coating is used to select the polarization direction of the optical signal. For example, the incident surface of the first micro-prism array 413 is provided with an antireflection coating of an optical coating, so that the interface reflectivity is lower than a first threshold value, for example, 2%, thereby reducing the loss of optical signals at the interface and further improving the fingerprint identification effect.

Alternatively, in some embodiments, as shown in fig. 18, 20 and 21, the first optical assembly and the second optical assembly each comprise a microlens array 411 and at least one aperture layer 412. The related technical solution of the microlens array 411 and the at least one aperture layer 412 can be seen in the related technical solution of the microlens array 321 and the at least one aperture layer 322 in fig. 10 above.

Optionally, in other embodiments, the first optical assembly and the second optical assembly may also be both straight-hole collimators. Each optical sensing unit in the optical fingerprint sensor corresponds to at least one collimating hole in the straight hole collimator; the straight hole collimator is used for receiving a first vertical light signal converted by the first micro prism array and a second vertical light signal converted by the second micro prism array, and the first vertical light signal and the second vertical light signal are transmitted to the optical fingerprint sensor through a collimating hole in the straight hole collimator.

It is understood that although the first optical assembly and the second optical assembly are respectively disposed in the first optical device 410a and the second optical device 410b, in practice, the first optical assembly and the second optical assembly have the same structure, and both of them may be disposed as a complete optical assembly, integrated or separately disposed above the optical fingerprint sensor.

As an example, fig. 22 shows a top view of the fingerprint recognition device 400 of fig. 18.

As shown in fig. 22, in the first micro-prism array 413a and the second micro-prism array 413b, a row of first optical sensing units or a column of first optical sensing units in the first sensing array is correspondingly disposed below each first micro-prism of the first micro-prism array 413a, and/or,

a row of second optical sensing units or a column of second optical sensing units in the second sensing array is correspondingly arranged below each second micro-prism of the second micro-prism array 413 b.

In the embodiment shown in fig. 18 and 22, the width of the first micro-prisms in the first micro-prism array 413a and the width of the second micro-prisms in the second micro-prism array 413b are the same as or similar to the width of the optical sensing unit, and in addition, the width of the first micro-prisms and the width of the second micro-prisms may also be the same as or similar to the diameter of the circular micro-lenses in the micro-lens array 411.

Of course, the widths of the first and second micro-prisms may be smaller or larger than the width of the optical sensing unit, in other words, one micro-lens in the micro-lens array 411 may receive the optical signals converted by the plurality of first micro-prisms or the optical signals converted by the plurality of second micro-prisms. Alternatively, a plurality of microlenses in the microlens array 411 may receive an optical signal converted by the same first microprism or an optical signal converted by the same second microprism, and the width dimensions of the first microprism and the second microprism are not specifically limited in this embodiment of the application.

In this case, optionally, as shown in fig. 23, at least one first micro-prism is correspondingly disposed above each first optical sensing unit of the first sensing array 421a, and/or at least one second micro-prism is correspondingly disposed above each second optical sensing unit of the second sensing array 421 b.

Or at least one first optical sensing unit, for example, at least one column of first optical sensing units or one row of first optical sensing units, is correspondingly arranged below each first micro prism of the first micro-prism array; and/or at least one second optical sensing unit, for example, at least one column of second optical sensing units or one row of second optical sensing units, is correspondingly arranged below each second micro-prism of the second micro-prism array.

Alternatively, in the embodiment of the present application, the first micro prism array 413a and the second micro prism array 413b may be disposed above the first optical assembly, the second optical assembly and the optical fingerprint sensor through a support structure, and the support structure may be disposed at an edge region of an upper surface of the optical fingerprint sensor. By way of example, the support structure includes, but is not limited to, a glue layer or a frame, which may be fabricated around the optical fingerprint sensor by a screen printing process or the like. Vacuum or air may be provided between the first micro-prism array 413a and the first optical assembly, and vacuum or air may be provided between the second micro-prism array 413b and the second optical assembly.

Optionally, the upper surface of the first micro-prism array 413a, that is, the first incident surface of the plurality of first micro-prisms in the first micro-prism array 413a, may be attached to the lower surface of the display screen; and/or the upper surface of the second micro-prism array 413b, that is, the second incident surface of the plurality of second micro-prisms in the second micro-prism array 413b, may be attached to the lower surface of the display screen. This reduces the vertical space occupied by the fingerprint identification device under the display screen.

It can be understood that if a first substrate layer 414a is further formed above the first micro-prism array 413a, and a second substrate layer 414b is further formed above the second micro-prism array 413b, the upper surface of the first substrate layer 414a and the lower surface of the display screen may be attached to each other; and/or an upper surface of second substrate layer 414b may conform to a lower surface of the display screen.

Alternatively, during the assembly manufacturing process, a certain gap may be provided between the upper surface of the first micro-prism array 413a and the display screen; and/or, a certain gap may be provided between the upper surface of the second micro-prism array 413b and the display screen. With this embodiment, it is possible to facilitate the assembly of the first and second

micro-prism arrays

413a and 413b under the display screen.

The embodiment of the application also provides electronic equipment which can comprise a display screen and the fingerprint identification device, wherein the fingerprint identification device is arranged below the display screen to realize optical fingerprint identification under the screen.

The electronic device may be any electronic device having a display screen.

The display screen may be the display screen described in the above description, for example, an OLED display screen or other display screens, and the description of the display screen may refer to the description of the display screen in the above description.

In some embodiments, the display screen is an OLED display screen and includes a plurality of OLED light sources, wherein the fingerprint identification device uses at least a portion of the OLED light sources as an excitation light source for fingerprint identification.

In other embodiments, the fingerprint identification device may also use an internal light source or an external light source to provide an optical signal for fingerprint identification, in which case, the display screen of the electronic device may also be a Micro light emitting diode (Micro-LED) display screen or a liquid crystal display screen with a backlight module and a liquid crystal panel.

It should be understood that the specific examples in the embodiments of the present application are for the purpose of promoting a better understanding of the embodiments of the present application and are not intended to limit the scope of the embodiments of the present application.

It is to be understood that the terminology used in the embodiments of the present application and the appended claims is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. For example, as used in the examples of this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

Those of ordinary skill in the art will appreciate that the elements of the examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described above generally in terms of their functionality in order to clearly illustrate the interchangeability of hardware and software. 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.

In the several embodiments provided in the present application, it should be understood that the disclosed system and apparatus may be implemented in other manners. 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 also be an electric, mechanical or other form of connection.

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 embodiments of the present application.

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 integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit 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 may be substantially or partially contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes 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.

While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A fingerprint identification device, for setting up below the display screen of electronic equipment, includes: a first optical device, a second optical device, and an optical fingerprint sensor;

the first optical device is used for guiding a first target optical signal reflected by a finger on a first fingerprint detection area in the display screen to a first sensing array in the optical fingerprint sensor;

the second optical device is used for guiding a second target optical signal reflected by a finger on a second fingerprint detection area in the display screen to a second sensing array in the optical fingerprint sensor;

the first sensing array and the second sensing array are used for fingerprint identification according to the first target optical signal and the second target optical signal respectively;

wherein the first fingerprint detection area and the second fingerprint detection area are not overlapped with each other, and a spacing area is arranged between the first fingerprint detection area and the second fingerprint detection area.

2. The fingerprint recognition device of claim 1, wherein in the optical fingerprint sensor, there is no space between the first sensing array and the second sensing array.

3. Fingerprint recognition apparatus according to claim 1 or 2, wherein the first and second sensing arrays are equal in area and/or the first and second fingerprint detection areas are equal in area.

4. The fingerprint recognition device according to any one of claims 1 to 3, wherein the first fingerprint detection area is located on one side of a boundary between the first sensing array and the second sensing array, and the second fingerprint detection area is located on the other side of the boundary between the first sensing array and the second sensing array.

5. The fingerprint recognition device of claim 4, wherein the first target light signal is directed towards the boundary line, and the first target light signal is at an angle θ to a normal direction of the optical fingerprint sensor₁；

The direction of the second target optical signal faces the boundary line, and an included angle between the second target optical signal and the normal direction of the optical fingerprint sensor is theta₂(ii) a Wherein, theta₁And theta₂Is between 0 and 90 deg..

6. The fingerprint recognition device of claim 5, wherein θ is θ₁＝θ₂The first optical device and the second optical device are arranged in a mirror image mode relative to a plane perpendicular to the display screen.

7. The fingerprint recognition device of any one of claims 1-6, wherein the first optical device comprises a first angled hole collimator and the second optical device comprises a second angled hole collimator;

the direction of a plurality of first inclined holes in the first inclined hole collimator is the same as that of the first target optical signal; the direction of a plurality of second inclined holes in the second inclined hole collimator is the same as the direction of the second target optical signal.

8. The fingerprint recognition device according to any one of claims 1 to 6, wherein the first optical device comprises a first microlens array and at least one first aperture layer, and the second optical device comprises a second microlens array and at least one second aperture layer;

a plurality of first light guide channels are formed in the at least one first diaphragm layer, and the directions of the plurality of first light guide channels are the same as the direction of the first target optical signal;

a plurality of second light guide channels are formed in the at least one second diaphragm layer, and the directions of the plurality of second light guide channels are the same as the direction of the second target optical signal.

9. The fingerprint recognition device of claim 8, wherein at least some of the at least one first aperture layer is a metal layer of the optical fingerprint sensor; and/or the presence of a gas in the gas,

at least part of the at least one second diaphragm layer is a metal layer of the optical fingerprint sensor.

10. The fingerprint recognition device of any one of claims 1-6, wherein the first optical device comprises a first angled-hole collimator and a first microlens array, the first angled-hole collimator disposed over the first microlens array;

the second optical device comprises a second inclined hole collimator and a second micro-lens array, and the second inclined hole collimator is arranged above the second micro-lens array.

11. The fingerprint recognition device of any one of claims 1-6, wherein the first optical device comprises: a first microprism array and a first optical component;

the first micro-prism array is used for receiving the first target optical signal and converting the first target optical signal into a first vertical optical signal vertical to the display screen;

the first optical assembly is arranged below the first micro-prism array and used for receiving the first vertical light signal and guiding the first vertical light signal to the first sensing array of the optical fingerprint sensor;

the second optical device includes: a second microprism array and a second optical component;

the second micro-prism array is used for receiving the second target optical signal and converting the second target optical signal in the second optical signal into a second vertical optical signal vertical to the display screen;

the second optical assembly is disposed below the second micro-prism array and used for receiving the second vertical light signal and guiding the second vertical light signal to a second sensing array of the optical fingerprint sensor.

12. The fingerprint recognition device of claim 11, wherein the first microprism array comprises a plurality of first microprisms, the first microprisms comprising a first entrance surface and a first exit surface, the first entrance surface being a plane parallel to the display screen and the first exit surface being a plane oblique to the display screen;

the first micro prism is used for receiving the first target optical signal through the first incident surface and emitting the first target optical signal into the first vertical optical signal through the first emitting surface;

the second micro prism array comprises a plurality of second micro prisms, each second micro prism comprises a second incident surface and a third emergent surface, the second incident surfaces are parallel planes relative to the display screen, and the third emergent surfaces are inclined planes relative to the display screen;

the second micro prism is used for receiving the second target optical signal through the second incident surface and emitting the second target optical signal as the second vertical optical signal through the third emitting surface.

13. The fingerprint recognition device of claim 12, wherein the first micro-prism further comprises a second exit surface, the second exit surface being another plane inclined with respect to the display screen, the second exit surface having an area smaller than the area of the first exit surface;

the second micro prism further comprises a fourth emergent surface, the fourth emergent surface is another plane inclined relative to the display screen, and the area of the fourth emergent surface is smaller than that of the third emergent surface.

14. The fingerprint recognition device of claim 12 or 13, wherein the first target light signal is oriented perpendicular to the edges of the first microprisms and the second target light signal is oriented perpendicular to the edges of the second microprisms.

15. The fingerprint recognition device of any one of claims 12-14, wherein the first and second microprism arrays are identical in structure and are mirrored with respect to a plane perpendicular to the display screen.

16. The fingerprint identification device according to any one of claims 13 to 15, wherein a first refracted light signal of the first target light signal after passing through the first incident surface is parallel to the second exit surface, an included angle between the first incident surface and the first exit surface is a first included angle i, an included angle between the first incident surface and the second exit surface is a second included angle j, and an included angle between the first target light signal and the incident surface is a target included angle θ;

the first included angle i, the second included angle j, and the refractive index n of the first microprism₁And the target included angle θ satisfies the following formula:

n₀sinθ＝n₁sin(90°-j)；

n₁sin(i+j-90°)＝n₀sini；

wherein n is₀Is the refractive index of air.

17. The fingerprint recognition device according to any one of claims 13 to 16, wherein the first incident surface is further configured to receive a non-target light signal reflected via a finger in a direction different from that of the first target light signal;

the first emergent surface and the second emergent surface are used for converting the non-target optical signal into an inclined optical signal inclined relative to the display screen;

the optical assembly is used for blocking the inclined light signal so as to prevent the inclined light signal from entering the optical fingerprint sensor and causing interference on fingerprint identification.

18. The fingerprint identification device of claim 17, wherein the non-target light signal includes a non-target angle β with respect to a normal direction of the first incident surface, and the refractive index n of the first micro-prism is equal to the non-target angle β₁And said non-target included angle β satisfies the following formula:

n₀sinβ＝n₁sink；

n₁sin(j-k)＝n₀sinj；

wherein n is₀The refractive index of air is represented by j, an included angle between the first incident surface and the second emergent surface is represented by k, and the included angle between the second refracted light signal of the non-target light signal passing through the first incident surface and the normal direction is represented by k.

19. The fingerprint identification device of claim 18, wherein the first microprism has a refractive index n₁And the first microprism is used for converting the non-target optical signal in the value range into an inclined optical signal.

20. The fingerprint recognition device of any one of claims 11-19, wherein the first microprism array and/or the second microprism array has a refractive index greater than 1.5.

21. The fingerprint recognition device of any one of claims 11-20, wherein the first sensing array comprises a plurality of first optical sensing elements, and the second sensing array comprises a plurality of second optical sensing elements;

at least one first optical sensing unit is correspondingly arranged below each first micro prism of the first micro prism array, and at least one second optical sensing unit is correspondingly arranged below each second micro prism of the second micro prism array; or,

at least one first microprism is correspondingly arranged above each first optical sensing unit of the first sensing array, and at least one second microprism is correspondingly arranged above each second optical sensing unit of the second sensing array.

22. The fingerprint identification device of claim 21, wherein a row of first optical sensing units or a column of first optical sensing units in the first sensing array is disposed below each first micro-prism of the first micro-prism array,

and a row of second optical sensing units or a column of second optical sensing units in the second sensing array is correspondingly arranged below each second micro prism of the second micro prism array.

23. The fingerprint identification device of any one of claims 12-22, wherein the first microprism array further comprises a first substrate layer and the second microprism array further comprises a second substrate layer;

the first substrate layer is formed above the first incidence surfaces of the first micro prisms, the second substrate layer is formed above the second incidence surfaces of the second micro prisms, and the first substrate layer and the second substrate layer are parallel to the display screen.

24. Fingerprint recognition device according to claim 23, wherein the upper surface of the first substrate layer and the lower surface of the display are attached to each other, and/or the upper surface of the second substrate layer and the lower surface of the display are attached to each other.

25. The fingerprint recognition device of claim 23 or 24, wherein the first substrate layer and/or the second substrate layer is an optical filter for passing optical signals of a target wavelength band and blocking optical signals of a non-target wavelength band.

26. The fingerprint recognition device according to any one of claims 11 to 25, wherein at least one surface of the first microprism array is provided with an anti-reflective coating and/or a polarizing coating, and/or at least one surface of the second microprism array is provided with an anti-reflective coating and/or a polarizing coating;

wherein the anti-reflection coating is used for reducing the reflectivity of the optical signal, and the polarization coating is used for selecting the polarization direction of the optical signal.

27. The fingerprint identification device of any one of claims 11-26, wherein the first and second micro-prism arrays are disposed over the first and second optical assemblies and the optical fingerprint sensor via a support structure disposed at an upper surface edge region of the optical fingerprint sensor.

28. The fingerprint recognition device of any one of claims 11-27, wherein the first optical assembly and the second optical assembly comprise:

a plurality of microlenses in the microlens array correspond to a plurality of optical sensing units in the optical fingerprint sensor one to one;

at least one diaphragm layer arranged between the micro lens array and the optical fingerprint sensor, wherein each diaphragm layer in the at least one diaphragm layer is provided with a light through small hole corresponding to each optical sensing unit in the optical fingerprint sensor;

wherein the micro-lens array is configured to receive the first vertical light signal and the second vertical light signal, and the first vertical light signal and the second vertical light signal are configured to be transmitted to the optical fingerprint sensor through the light-transmitting aperture of the at least one diaphragm layer.

29. The fingerprint recognition device of claim 28, wherein at least some of the at least one optical stop layer is a metal wiring layer of the optical fingerprint sensor.

30. The fingerprint identification device according to any one of claims 11 to 27, wherein the first optical assembly and the second optical assembly are straight hole collimators, and each optical sensing unit in the optical fingerprint sensor corresponds to at least one collimating hole in the straight hole collimators;

wherein the straight-hole collimator is configured to receive the first vertical light signal converted by the first micro-prism array and the second vertical light signal converted by the second micro-prism array, and the first vertical light signal and the second vertical light signal are transmitted to the optical fingerprint sensor through a collimating hole in the straight-hole collimator.

31. An electronic device, comprising: a display screen and a display screen, and,

the fingerprint recognition device according to any one of claims 1 to 30, wherein said fingerprint recognition device is disposed below said display screen.

32. The electronic device of claim 31, wherein the display screen is an Organic Light Emitting Diode (OLED) display screen, the display screen comprises a plurality of OLED light sources, and wherein the fingerprint identification device employs at least a portion of the OLED light sources as excitation light sources for fingerprint identification.