WO2020102949A1

WO2020102949A1 - Fingerprint identification apparatus and electronic device

Info

Publication number: WO2020102949A1
Application number: PCT/CN2018/116259
Authority: WO
Inventors: 侯侣
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2018-11-19
Filing date: 2018-11-19
Publication date: 2020-05-28
Also published as: CN109643377A

Abstract

A fingerprint identification apparatus (130) and an electronic device (100). The fingerprint identification apparatus (130) is arranged below a display screen (120) so that a fingerprint collection area (103) of said apparatus is at least partially located in a display area (102) of the display screen (120); the fingerprint identification apparatus (130) comprises: a support member, one end of the support member being used for connecting the display screen (120), the other end of the support member being used for connecting a circuit board (140) below the fingerprint identification apparatus (130), the support member being provided with a fixing structure, and the fixing structure being used for fixing an optical collimator; an optical fingerprint sensor provided on the circuit board (140); the optical collimator provided on the fixing structure, so that the optical collimator is provided above the optical fingerprint sensor, and a distance between the optical collimator and the display screen (120) and a distance between the optical collimator and the optical fingerprint sensor satisfy the imaging requirements of the optical collimator. Therefore, the fingerprint identification apparatus (130) can implement effective fingerprint identification.

Description

Fingerprint identification device and electronic equipment

Technical field

Embodiments of the present application relate to the field of fingerprint identification technology, and more specifically, to a fingerprint identification device and electronic equipment.

Background technique

With the rapid development of electronic devices, fingerprint recognition technology has attracted more and more attention. For the current common capacitive fingerprint recognition technology on the market, it is not only affected by the penetration thickness and wet fingers, but also has a greater restriction on the placement of the fingerprint recognition device on the electronic device, and affects the screen ratio of the electronic device.

The optical fingerprint recognition technology collects the reflected light formed by the light emitted from the light source by the optical fingerprint sensor and reflected by the finger, and the reflected light carries the fingerprint information of the finger, thereby realizing the fingerprint recognition. Compared with the capacitive fingerprint identification device, the optical fingerprint identification device has lower requirements for the screen thickness of the electronic device, and the placement position on the electronic device can be more flexible, and the screen ratio of the electronic device can be improved. In order to realize these advantages, optical fingerprint recognition devices need to include optical components such as optical fingerprint sensors and optical collimators. Therefore, how to properly set these optical components so that the optical fingerprint recognition device can achieve effective fingerprint recognition has become an urgent need to solve problem.

Summary of the invention

The embodiments of the present application provide a fingerprint identification device and an electronic device. The structure of the fingerprint identification device enables it to realize effective fingerprint identification.

According to a first aspect, there is provided a fingerprint recognition device, which is used to be disposed below a display screen so that a fingerprint collection area thereof is at least partially within a display area of the display screen, and the fingerprint recognition device includes:

A support member, one end of the support member is used to connect to the display screen, and the other end of the support member is used to connect to the circuit board under the fingerprint identification device; the support member is provided with a fixing structure, the fixing The structure is used to fix the optical collimator;

An optical fingerprint sensor is provided on the circuit board and is used to detect the light signal reflected by the object above the fingerprint collection area;

The optical collimator is arranged in the fixed structure, so that the optical collimator is arranged above the optical fingerprint sensor, and the distance between the optical collimator and the display screen and The distance between the optical collimator and the optical fingerprint sensor satisfies the imaging requirements of the optical collimator, and the optical collimator is used to guide the optical signal from the fingerprint collection area to the optical fingerprint sensor.

In this embodiment, a fixing structure is provided on the support of the fingerprint recognition device for fixing the optical collimator, so that the distance between the optical collimator and the display screen and between the optical collimator and the optical fingerprint sensor The distances respectively meet the imaging requirements of the optical collimator, thus enabling effective fingerprint recognition. Moreover, since no material such as a substrate is required in the fingerprint recognition device, the thickness of the fingerprint recognition device can be reduced.

In a possible implementation manner, the support member includes two brackets, and the fixing structure is a protrusion extending along inner walls of the two brackets, wherein the optical collimator is fixed at the The upper or lower surface of the raised portion.

In a possible implementation manner, the fingerprint identification device further includes an optical filter disposed above the optical fingerprint sensor, for selecting a wavelength of the optical signal transmitted to the optical fingerprint sensor. Wherein, when the optical collimator is fixed on the upper surface of the convex portion, the optical filter is fixed on the lower surface of the convex portion, or the optical filter is provided on the optical fingerprint sensor The upper surface of the; or, when the optical collimator is fixed on the lower surface of the convex portion, the optical filter is fixed on the upper surface of the convex portion, or the optical filter is provided on the The upper surface of the optical fingerprint sensor.

In a possible implementation manner, the optical collimator is fixed on the upper surface or the lower surface of the convex portion, including: the non-light-transmissive area at the edge of the optical collimator is pasted on the The upper surface or the lower surface of the convex portion; the optical filter is fixed on the upper surface or the lower surface of the convex portion, including: the non-transmissive area at the edge of the filter is pasted to the The upper surface or the lower surface of the convex portion; the optical filter is provided on the upper surface of the optical fingerprint sensor, including: the optical filter is pasted on the upper surface of the optical fingerprint sensor through a transparent adhesive material.

In a possible implementation manner, the optical fingerprint identification device is pasted on the lower surface of the display screen through an opaque pasting material.

In a possible implementation manner, the optical fingerprint recognition device further includes a wire, and the wire is used to electrically connect the optical fingerprint sensor and the circuit board.

According to a second aspect, there is provided a fingerprint recognition device, which is arranged below a display screen so that its fingerprint collection area is at least partially within a display area of the display screen, and the fingerprint recognition device includes:

An optical fingerprint sensor is provided on the base of the fingerprint identification device and is used to detect the light signal reflected by the object above the fingerprint collection area;

An optical collimator is provided above the optical fingerprint sensor for guiding the optical signal from the fingerprint collection area to the optical fingerprint sensor, the optical collimator and the optical fingerprint sensor are packaged together, Or the optical collimator is provided above the optical fingerprint sensor as a relatively independent component from the optical fingerprint sensor;

Wherein, the distance between the optical collimator and the display screen and the distance between the optical collimator and the optical fingerprint sensor meet the imaging requirements of the optical collimator.

In a possible implementation manner, the fingerprint identification device further includes an optical filter disposed above the optical fingerprint sensor, for selecting a wavelength of the optical signal transmitted to the optical fingerprint sensor.

Wherein the optical filter and the optical fingerprint sensor are packaged together, and the optical collimator is provided above the optical filter as a relatively independent component from the optical filter and the optical fingerprint sensor; or ,

The optical collimator and the optical fingerprint sensor are packaged together, and the optical filter is provided above the collimator as a relatively independent component from the optical collimator and the optical fingerprint sensor; or,

The optical collimator, the optical filter and the optical fingerprint sensor are packaged together.

In a possible implementation manner, the components packaged together are pasted together by a transparent adhesive material, and the non-light-transmissive areas at the edges of the relatively independent components are pasted to the upper surface of the packaging material by an opaque adhesive material .

In a possible implementation manner, the fingerprint identification device is pasted on the lower surface of the display screen through an opaque pasting material.

In a possible implementation manner, the optical fingerprint recognition device further includes a wire, and the wire is used to electrically connect the optical fingerprint sensor and the substrate.

In a possible implementation, the substrate is connected to the circuit board under the fingerprint identification device by soldering.

In a third aspect, an electronic device is provided, including: a self-luminous display screen; and, a fingerprint recognition device in the first aspect or any possible implementation manner of the first aspect or any possible aspect in the second aspect or the second aspect Fingerprint recognition device in implementation.

In a possible implementation manner, the display screen is an organic light-emitting diode display OLED, and the light-emitting layer of the display screen includes a plurality of organic light-emitting diode light sources, wherein the fingerprint recognition device uses at least part of the organic light-emitting diode light sources as Excitation light source for fingerprint identification.

BRIEF DESCRIPTION

FIG. 1 is a schematic plan view of an electronic device to which this application can be applied.

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

FIG. 3 is a schematic diagram of the positional relationship between the fingerprint identification device and the display screen according to an embodiment of the present application.

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

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

6 is a schematic structural diagram of an optical collimator according to an embodiment of the present application.

7 is a schematic diagram of the angle of light rays passing through an optical collimator according to an embodiment of the present application.

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

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

10 is a schematic diagram of the connection between the fingerprint identification device and the display screen according to an embodiment of the present application.

11 is a schematic diagram of the connection between the fingerprint identification device and the display screen according to an embodiment of the present application.

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

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

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

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

16 is a schematic diagram of the connection between the fingerprint identification device and the display screen according to an embodiment of the present application.

17 is a schematic diagram of the connection between the fingerprint identification device and the display screen according to an embodiment of the present application.

detailed description

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

As the electronic device enters the era of full screen, the fingerprint collection area on the front of the electronic device is squeezed by the full screen, so the under-display (Under-display or Under-screen) fingerprint recognition technology has attracted more and more attention. Under-screen fingerprint recognition technology refers to the installation of fingerprint recognition devices (such as optical fingerprint recognition devices) below the display screen, so as to realize fingerprint recognition operations in the display area of the display screen, without the need for areas other than the display area on the front of electronic devices Set the fingerprint collection area.

The fingerprint recognition technology under the optical screen uses the light returned from the top surface of the display component of the device to perform fingerprint sensing and other sensing operations. The returned light carries information of an object (such as a finger) that is in contact with the top surface. By collecting and detecting the returned light, a specific optical sensor module located below the display screen is realized. The design of the optical sensor module may be to achieve the desired optical imaging by appropriately configuring the optical elements for collecting and detecting the returned light.

It should be understood that the technical solutions of the embodiments of the present application can be applied to various electronic devices, such as smart phones, notebook computers, tablet computers, game devices, and other portable or mobile computing devices, as well as electronic databases, automobiles, and bank automatic teller machines , ATM) and other electronic devices, but this embodiment of the present application is not limited thereto.

1 and 2 show a schematic diagram of an electronic device 100 to which the fingerprint identification device according to an embodiment of the present application can be applied, wherein FIG. 1 is a schematic front view of the electronic device 100, and FIG. 2 is AA 'partial cross-sectional structure diagram.

As shown in FIG. 1 and FIG. 2, the electronic device 100 includes a display screen 120 and an optical fingerprint recognition device (hereinafter simply referred to as a fingerprint recognition device) 130, wherein the optical fingerprint recognition device 130 has one or more sensors An array, the sensing array is at least disposed in a partial area below the display screen 120, so that the fingerprint collection area (or sensing area) 103 of the optical fingerprint recognition device 130 is at least partially located in the display area 102 of the display screen 120 .

It should be understood that the area of the fingerprint collection area 103 may be different from the area of the sensing array of the optical fingerprint recognition device 130, for example, through optical path design such as lens imaging, reflective folding optical path design, or other optical path design such as light gathering or reflection , The area of the fingerprint collection area 103 of the optical fingerprint identification device 130 may be larger than the area of the sensing array of the optical fingerprint identification device 130. In other alternative implementations, if the light path is guided by, for example, light collimation, the fingerprint collection area 103 of the optical fingerprint identification device 130 may also be designed to be consistent with the area of the sensing array of the optical fingerprint identification device 130.

As shown in FIG. 1, the fingerprint collection area 103 is located in the display area 102 of the display screen 120. Therefore, when the user needs to unlock the electronic device or other fingerprint verification, he only needs to press his finger In the fingerprint collection area 103 located in the display screen 120, fingerprint input can be realized. Since fingerprint detection can be implemented within the screen, the electronic device 100 adopting the above structure does not require a special reserved space on the front to set fingerprint keys (such as the Home key), so that a full screen solution can be adopted, that is, the display area of the display screen 120 102 can be basically extended to the front of the entire electronic device 100.

As an embodiment, the display screen 120 may be a self-luminous display screen, which uses a self-luminous display unit as a display pixel, such as an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display screen or a micro light-emitting diode (Micro -LED) display screen. Taking an OLED display screen as an example, the optical fingerprint recognition device 130 may use the OLED display unit (ie, OLED light source) of the OLED display screen 120 located in the fingerprint recognition area 103 as an excitation light source for optical fingerprint detection.

In other embodiments, the optical fingerprint recognition device 130 may also use an internal light source or an external light source to provide an optical signal for fingerprint detection. In this case, the optical fingerprint recognition device 130 may be applicable to non-self-luminous display screens, such as liquid crystal display screens or other passive light-emitting display screens. Taking an LCD screen with a backlight module and a liquid crystal panel as an example, in order to support under-screen fingerprint detection of the LCD screen, the optical fingerprint system of the electronic device 100 may further include an excitation light source for optical fingerprint detection. The excitation light source may specifically be an infrared light source or a light source of a non-visible light of a specific wavelength, which may be provided under the backlight module of the liquid crystal display screen or the edge area under the protective cover of the electronic device 100, and the The optical fingerprint recognition device 130 may be disposed under the edge area of the liquid crystal panel or the protective cover and guided by the optical path so that the fingerprint detection light can reach the optical fingerprint recognition device 130; or, the optical fingerprint recognition device 130 may also be disposed at the Under the backlight module, and the backlight module allows the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optics through openings or other optical design of the film layers such as the diffusion sheet, the brightness enhancement sheet, the reflection sheet, etc. Fingerprint recognition device 130.

In addition, the sensing array of the optical fingerprint recognition device 130 is specifically a photodetector array, which includes a plurality of photodetectors distributed in an array, and the photodetectors can be used as the optical sensing unit as described above . When a finger touches, presses, or approaches (for ease of description, this application is collectively referred to as touch) on the fingerprint recognition area 103, the light emitted by the display unit of the fingerprint recognition area 103 reflects on the fingerprint on the surface of the finger and forms reflected light The reflected light of the ridges and valleys of the finger fingerprint is different. The reflected light is received from the display screen 120 and received by the photodetector array and converted into a corresponding electrical signal, that is, a fingerprint detection signal. Based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, thereby implementing an optical fingerprint recognition function in the electronic device 100.

It should be understood that, in a specific implementation, the electronic device 100 further includes a transparent protective cover 110, and the cover 110 may be specifically a transparent cover, such as a glass cover or a sapphire cover, which is located on the display screen 120 above and covering the front of the electronic device 100. Therefore, in the embodiment of the present application, the so-called finger touch, pressing or approaching on the display screen 120 actually refers to the finger touching, pressing or approaching the cover plate 110 above the display screen 120 or covering the cover plate 110 Surface of the protective layer. In addition, the electronic device 100 may further include a touch sensor, and the touch sensor may be specifically a touch panel, which may be provided on the surface of the display screen 120, or may be partially or wholly integrated into the display screen 120, namely The display screen 120 is specifically a touch display screen.

As an optional implementation manner, as shown in FIG. 2, the optical fingerprint recognition device 130 includes an optical detection unit 134 and an optical component 132, and the optical detection unit 134 includes the sensing array and the sensor array. The read circuit and other auxiliary circuits that are connected sexually can be fabricated on a chip through a semiconductor process; that is, the optical detection unit 134 can be fabricated on an optical imaging chip or an image sensor chip. The optical component 132 may be disposed above the sensing array of the optical detection unit 134, which may specifically include an optical filter (or filter), an optical path guiding structure, and other optical elements. The sheet can be used to filter out the ambient light penetrating the finger, and the light path guiding structure is mainly used to guide the light path such as collimating, modulating or converging the downward propagating light to realize the reflected light guide that will reflect back from the finger surface Lead to the sensing array for optical detection.

In a specific implementation, the optical component 132 may be packaged with the optical detection unit 134 in the same optical fingerprint chip, or the optical component 132 may be disposed outside the chip where the optical detection unit 134 is located, such as The optical component 132 is attached to the chip, or a part of the components of the optical component 132 is integrated into the chip. Among them, the optical path guiding structure of the optical component 132 has various implementation solutions, for example, it may be specifically an optical path modulator or an optical path collimator made of semiconductor silicon wafers or other substrates, which has multiple optical path modulation units or A collimating unit, the optical path modulation unit or the collimating unit may be specifically a micro-hole array. Alternatively, the light guide layer may also be an optical lens (Lens) layer, which has one or more lens units, such as a lens group composed of one or more aspheric lenses. After the reflected light reflected from the finger is collimated or condensed by the micro-hole array or the lens unit, and received by the optical sensing unit below it, the sensing array can detect the fingerprint image of the finger .

A circuit board 140, such as a flexible printed circuit (FPC), may also be provided under the optical fingerprint recognition device 130, and the optical fingerprint recognition device 130 may be soldered to the circuit board 140 through pads, for example. In addition, the circuit board 140 realizes electrical interconnection and signal transmission with other peripheral circuits or other elements of the electronic device 100. For example, the optical fingerprint recognition device 130 may receive the control signal of the processing unit of the electronic device 100 through the circuit board 140, and may also output the fingerprint detection signal to the electronic device through the circuit board 140 100 processing unit or control unit.

This application provides the structure of two optical fingerprint identification devices. For example, as shown in FIG. 3, the fingerprint identification device can be placed under the display screen. According to the size of the fingerprint recognition device and the layout requirements of the fingerprint collection area of the fingerprint recognition device, combined with ergonomics, materials such as foam and copper foil can be removed at a corresponding position on the back of the self-luminous display to form a specific recess groove. The fingerprint identification device can be pasted into the groove of the display screen in a certain direction by pasting or the like to achieve the combination of the optical fingerprint identification device and the display screen.

The fingerprint recognition device of the embodiment of the present application will be described in detail below with reference to FIGS. 4 to 11. The fingerprint identification device can be applied to electronic equipment with a self-luminous display screen, for example.

4 and 5 show a possible structure of the fingerprint identification device 400 according to an embodiment of the present application. As shown in FIGS. 4 and 5, the fingerprint identification device is used to be arranged below the display screen so that its fingerprint collection area is at least partially within the display area of the display screen. The fingerprint identification device includes a support, an optical fingerprint sensor and an optical collimator.

Wherein, one end of the support member is used to connect to the display screen, and the other end of the support member is used to connect to the circuit board under the fingerprint identification device, and the support member is provided with a fixing structure, and the fixing structure Used to fix the optical collimator.

The optical fingerprint sensor is disposed on the circuit board, and is used to detect an optical signal reflected by an object above the fingerprint collection area.

The optical collimator is disposed on the fixed structure, so that the optical collimator is disposed above the optical fingerprint sensor, and the distance between the optical collimator and the display screen and the The distance between the optical collimator and the optical fingerprint sensor meets the imaging requirements of the optical collimator, and the optical collimator is used to guide the optical signal from the fingerprint collection area to the optical fingerprint sensor .

The embodiment of the present application does not limit the material of the support. One end of the support is connected to the display screen above the fingerprint identification device, and the other end is connected to the circuit board below the fingerprint identification device, thereby forming an internal space of the fingerprint identification device to set various optical components. The supporting member is provided with a fixing structure, which can play a role of fixing the optical collimator. And by setting the height position of the fixing structure on the support, the distance between the optical collimator and the display screen can meet the imaging requirements of the optical collimator when the optical collimator is fixed on the fixing structure The satisfied object distance requirement and the distance between the optical collimator and the optical fingerprint sensor meet the image distance requirement required for imaging by the optical collimator, so that the optical signal reflected by the object above the fingerprint collection area can accurately arrive Optical fingerprint sensor.

The optical fingerprint sensor includes a sensing array having a plurality of optical sensing units, and the area where the sensing array is located corresponds to a fingerprint collection area of the fingerprint recognition device. In this way, after the light reflected from the finger above the fingerprint collection area reaches the optical fingerprint sensor through the optical collimator, the sensing unit of the optical fingerprint sensor can obtain the optical signal carrying the fingerprint pattern, thereby processing the collected optical signal to Realize accurate fingerprint identification.

Moreover, since each component in the fingerprint recognition device does not need to be formed on a material such as a substrate, the thickness of the fingerprint recognition device can be reduced, thereby reducing the volume of the fingerprint recognition device while achieving optical fingerprint recognition.

Optionally, the support member includes two brackets, and the fixing structure is a protrusion extending along the inner side walls of the two brackets, for example, as shown in FIGS. 4 and 5. However, the present application is not limited to this, and the fixing structure may also be a step structure provided on the two brackets.

Wherein, the optical collimator may be fixed on the upper surface or the lower surface of the protrusion. For example, as shown in FIG. 4, the optical collimator is pasted on the upper surface of the convex portion; and as shown in FIG. 8, the optical collimator is pasted on the lower surface of the convex portion. Wherein, the adhesive material for pasting the optical collimator and the protrusion may be an opaque pasting material, such as an opaque adhesive film or glue.

The height of the protrusion extending along the inner side walls of the two brackets needs to consider the imaging parameters of the optical collimator. The distance between the optical collimator and the display screen is the image distance P of the optical collimator, which should be within a certain range; the distance between the optical collimator and the optical fingerprint sensor is the image distance Q of the optical collimator, It should also be within a certain range. Therefore, the total height of the bracket and the height of the position of the protrusion on the bracket should be such that after the optical collimator is fixed on the upper or lower surface of the protrusion, between the optical collimator and the display screen The distance between the optical collimator and the optical fingerprint sensor is within the corresponding range.

The optical collimator in the embodiment of the present application may be, for example, a silicon wafer with a through-hole array, or a combination of high-transmittance glass and low-transmittance material, as shown in FIG. A light-transmitting hole with a regular aperture and a hole spacing, the light-transmitting hole can have a high transmittance of light reflected by the finger above the fingerprint collection area, for example, greater than 95%, and other non-light-transmitting areas have a high absorption rate for the light For example, T = I _t / I ₀ ≦ 5% (I _t is transmitted light, I ₀ is incident light). The light transmitting hole may also be a solid hole or a hollow through hole. The optical collimator is mainly used to collimate, modulate and image the downward fingerprint detection light, and realize the reflection of light reflected from the finger surface to the sensing unit of the optical fingerprint sensor for optical detection Fingerprint image information, and filter the light that does not meet the angle of incidence requirements, such as the light with an angle greater than α in the axial direction of the aperture in FIG. 7. The ratio of the diameter D of the single hole to the thickness T of the optical collimator may be between 1:30 and 1: 5, for example. The arrangement angle of the light transmitting holes on the optical collimator matches the arrangement direction of the self-luminous units on the self-luminous display screen.

Optionally, the fingerprint identification device further includes an optical filter provided above the optical fingerprint sensor, wherein, when the optical collimator is fixed on the upper surface of the convex portion, the optical filter is fixed on the convex portion The lower surface of the optical fingerprint sensor, or the optical filter is disposed on the upper surface of the optical fingerprint sensor; or,

When the optical collimator is fixed on the lower surface of the convex portion, the optical filter is fixed on the upper surface of the convex portion, or the optical filter is provided on the upper surface of the optical fingerprint sensor.

The optical filter (or referred to as a filter, etc.) in the embodiment of the present application has a high transmittance for light in a specific wavelength band, but does not have a high transmittance for other wavelength bands. The base material of the optical filter can be, for example, blue glass or blue crystal and other high-transmittance materials. The upper surface and the lower surface of the base material are respectively coated with a film of a specific material, number of layers and thickness, so as to achieve The light of the optical filter is filtered to achieve the function of wavelength selection.

The optical filter can be placed anywhere between the display screen and the optical fingerprint sensor.

For example, as shown in FIG. 4, the optical collimator is pasted on the upper surface of the convex portion, and the optical filter is pasted on the lower surface of the convex portion. As another example shown in FIG. 5, the optical collimator is pasted on the upper surface of the convex portion, and the optical filter is pasted on the upper surface of the optical fingerprint sensor. At this time, the optical signal reflected by the finger is modulated by the optical collimator and then directed to the sensing unit of the optical fingerprint sensor, and filtered by the optical filter before the light reaches the optical fingerprint sensor.

Of course, in the embodiments of the present application, the optical collimator and the optical filter are both disposed between the display screen and the optical fingerprint sensor, but the distance between the optical collimator and the display screen and the optical fingerprint sensor should meet certain requirements, and The optical filter can be placed anywhere between the display and the optical fingerprint sensor. Therefore, in addition to the structure of the fingerprint identification device shown in FIGS. 4 and 5, the optical collimator and the optical filter may have other arrangements as long as the above distance requirements are satisfied. For example, as shown in FIG. 8, the optical collimator is pasted on the lower surface of the convex portion, and the optical filter is pasted on the upper surface of the convex portion. As another example shown in FIG. 9, the optical collimator is attached to the upper surface of the optical fingerprint sensor, and the optical filter is attached to the upper surface of the convex portion. At this time, the optical signal reflected by the finger is filtered by an optical filter first, and the filtered light beam located in a specific wavelength band is modulated by an optical collimator and then guided to the sensing unit of the optical fingerprint sensor.

Between each optical component in FIGS. 4 to 9, when pasting in the light-transmitting area of the fingerprint recognition device, the pasting material is transparent, so as to avoid blocking the transmission of the optical signal carrying fingerprint information; When the light-transmitting area is pasted, the pasting material is opaque to avoid interference with the optical signal.

For example, when the optical filter is fixed on the upper surface or the lower surface of the convex portion, the non-light-transmissive area of the edge is pasted on the upper surface or the upper surface of the convex portion through an opaque adhesive material such as opaque glue or adhesive film, etc. lower surface. When the optical filter is disposed above the optical sensor, a transparent adhesive material such as transparent glue or adhesive film needs to be attached to the upper surface of the optical sensor.

For another example, when the optical collimator is fixed on the upper surface or the lower surface of the convex portion, the non-light-transmissive area of the edge is pasted on the convex portion through an opaque adhesive material such as opaque glue or adhesive film, etc. Surface or lower surface. When the optical collimator is disposed above the optical sensor, a transparent adhesive material such as a transparent adhesive film or the like needs to be attached to the upper surface of the optical sensor.

Optionally, the fingerprint identification device is pasted on the lower surface of the display screen through an opaque pasting material. For example, as shown in FIGS. 10 and 11, the fingerprint recognition device is installed in a groove below the display screen. In addition, foam or opaque glue film with a certain thickness can be added between the support and the display screen, and the periphery of the connection between the support member and the display screen can also be fixed by glue or other materials. An opaque film is used as an example between the support member and the display screen in FIGS. 10 and 11. The opaque film can not only play the role of connecting the support member and the display screen, but also increase the connection strength between the fingerprint recognition device and the display screen. Etc.

Optionally, the fingerprint identification device further includes a wire, such as a gold wire, for electrically connecting the optical fingerprint sensor and the circuit board.

Optionally, the fingerprint recognition device further includes a signal processing module, which may be provided on the circuit board and in the internal space of the fingerprint recognition device, for processing the optical signal received by the optical fingerprint sensor, for example As shown in FIG. 10 and FIG. 11, the signal processing module is arranged in an extra space inside the fingerprint recognition device, so that the space can be effectively used.

12 to 15 show a possible structure of a fingerprint identification device 400 according to another embodiment of the present application.

As shown in FIGS. 12 to 15, the fingerprint recognition device is arranged below the display screen so that its fingerprint collection area is at least partially within the display area of the display screen, and the fingerprint recognition device includes a support, an optical fingerprint sensor and an optical quasi Straightener.

Wherein, the optical fingerprint sensor is arranged on the base of the fingerprint identification device, and is used to detect the light signal reflected by the object above the fingerprint collection area.

The optical collimator is disposed above the optical fingerprint sensor, and is used to guide the optical signal from the fingerprint collection area to the optical fingerprint sensor, the optical collimator is packaged with the optical fingerprint sensor, or the optical collimator The straightener is disposed above the optical fingerprint sensor as a relatively independent component from the optical fingerprint sensor.

In this embodiment, the internal structure of the optical fingerprint identification device is constructed by packaging without making any support. Wherein, the optical collimator may be packaged with the optical fingerprint sensor, or may also be arranged above the optical fingerprint sensor as a relatively independent component from the optical fingerprint sensor. Here, the distance between the optical collimator and the display screen should meet the requirements of the object distance required for imaging by the optical collimator, and the distance between the optical collimator and the optical fingerprint sensor meet the optical collimation The image distance required by the imager needs to be met, so that the optical signal reflected by the object above the fingerprint collection area can accurately reach the optical fingerprint sensor.

In this way, after the light reflected from the finger above the fingerprint collection area reaches the optical fingerprint sensor through the optical collimator, the sensing unit of the optical fingerprint sensor can obtain the optical signal carrying the fingerprint pattern, thereby processing the collected optical signal to Realize accurate fingerprint identification.

Optionally, the fingerprint identification device further includes an optical filter disposed above the optical fingerprint sensor, for selecting the wavelength of the optical signal transmitted to the optical fingerprint sensor.

Wherein, the optical filter and the optical fingerprint sensor are packaged together, and the optical collimator is provided above the optical filter as a relatively independent component from the optical filter and the optical fingerprint sensor; or,

The optical collimator is packaged with the optical fingerprint sensor, and the optical filter is disposed above the collimator as a relatively independent component from the optical collimator and the optical fingerprint sensor; or,

It should be understood that both the optical collimator and the optical filter are arranged between the display screen and the optical fingerprint sensor, but the distance between the optical collimator and the display screen and the optical fingerprint sensor should meet certain requirements, and the optical filter can be set Anywhere between the display and the optical fingerprint sensor.

For example, as shown in FIG. 12, the optical filter is pasted on the upper surface of the optical fingerprint sensor, and the optical filter is packaged with the optical fingerprint sensor, and the optical collimator is pasted on the upper surface of the packaging material (or plastic molding material). As another example shown in FIG. 13, the optical collimator is pasted on the upper surface of the optical fingerprint sensor, and the optical collimator is packaged with the optical fingerprint sensor, and the optical filter is pasted on the upper surface of the packaging material. As another example shown in FIGS. 14 and 15, the optical collimator, optical filter and optical fingerprint sensor are packaged together. Among them, in FIG. 14, the optical filter is pasted on the upper surface of the optical fingerprint sensor and the optical collimator is pasted on the upper surface of the optical filter; in FIG. 15, the optical collimator is pasted on the upper surface of the optical fingerprint sensor and The optical filter is attached to the upper surface of the optical collimator.

In the fingerprint identification device, the components that are packaged together can be pasted together with transparent adhesive materials to avoid blocking the transmission of optical signals; the non-light-transmissive areas on the edges of relatively independent components can be pasted on the packaging materials with opaque adhesive materials To avoid interference with the optical signal.

For example, in FIG. 12, the bonding material between the optical filter and the optical fingerprint sensor should have a high transmittance, such as a transparent adhesive film. The adhesive material between the optical collimator and the packaging material is an opaque adhesive material such as an opaque adhesive film or glue. Among them, the thickness of the opaque paste material between the optical collimator and the packaging material meets a certain thickness requirement, so that the distance between the optical collimator and the optical fingerprint sensor is at the image distance required for imaging by the optical collimator Within range.

Moreover, the distance between the fingerprint recognition device and the display screen should meet a certain distance requirement, so that the distance between the optical collimation distance and the optical fingerprint sensor is within the range of the object distance required for imaging by the optical collimator. Therefore, the optical signal reflected by the object above the fingerprint collection area can accurately reach the optical fingerprint sensor.

Optionally, the fingerprint identification device is pasted on the lower surface of the display screen through an opaque pasting material. For example, as shown in FIGS. 16 and 17, the fingerprint recognition device is installed in the groove below the display screen. In addition, a certain thickness of foam or opaque film can be added between the support and the display. The thickness can be used to adjust the distance between the optical collimator and the display, and the connection between the support and the display Both sides can be fixed by glue and other materials. An opaque adhesive film is used as an example between the support member and the display screen in FIGS. 16 and 17. The thickness of the opaque adhesive film makes the distance between the optical collimator and the display screen meet the imaging requirements of the optical collimator, and can It plays the role of connecting the support and the display screen, and can also increase the connection strength of the fingerprint recognition device and the display screen.

In FIGS. 12 to 15, the preferred solution may refer to the fingerprint identification device shown in FIG. 12. In FIGS. 13 to 15, the optical collimator is directly pasted and packaged with the optical fingerprint sensor and / or the optical filter through the adhesive film, so the lower surface of the optical collimator passes through the adhesive film and its lower parts When pasting, or when the upper surface of the optical collimator is pasted with the upper part through the adhesive film, the adhesive film material may overflow into the light transmitting hole of the optical collimator, thereby affecting the performance of the optical collimator . In Figure 12, the optical collimator is not packaged with the optical fingerprint sensor and the optical filter, that is, the optical collimator is not packaged, but the areas on both ends of the optical collimator that are not used for light transmission will pass through the opaque The adhesive material is attached to the upper surface of the packaging material. In this way, the light-transmitting holes of the optical collimator can avoid overflowing into the adhesive material, ensuring the performance of the optical collimator.

Optionally, the substrate is connected to the circuit board under the fingerprint identification device by soldering. For example, as shown in FIGS. 12 to 15, there are pads under the substrate, and the pads under the substrate are soldered to the pads on the circuit board by solder, such as tin, and are electrically connected.

Optionally, the optical fingerprint recognition device further includes a wire, such as a gold wire, for electrically connecting the optical fingerprint sensor and the substrate, or electrically connecting the optical fingerprint sensor and the circuit board.

It should be understood that in the fingerprint identification device of the embodiment of the present application, the components that need to be pasted together must be pasted materials with high transmittance if they are pasted in the light-transmitting area, so as to avoid blocking the transmission of optical signals ; If it is pasted in a non-light-transmissive area, it is recommended to use opaque pasting materials to avoid interference of stray light on the optical signal.

An embodiment of the present application also provides an electronic device. The electronic device may include a self-luminous display screen and the fingerprint identification device in the various embodiments of the present application described above.

The electronic device may be any electronic device with a self-luminous display screen, which uses the technical solution of the embodiments of the present application to realize fingerprint identification under an optical screen.

The display screen may use the display screen described above, such as an OLED display screen.

When the self-luminous display screen is an organic light-emitting diode display screen, the light-emitting layer of the self-luminous display screen includes a plurality of organic light-emitting diode light sources, wherein the fingerprint identification device uses at least part of the organic light-emitting diode light source as an excitation light source for fingerprint identification.

It should be understood that the specific examples in the embodiments of the present application are only to help those skilled in the art to better understand the embodiments of the present application, and do not limit the scope of the embodiments of the present application.

It should be understood that the terms used in the embodiments of the present application and the appended claims are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. For example, the singular forms "a", "above", and "the" used in the embodiments of the present application and the appended claims are also intended to include most forms unless the context clearly indicates other meanings.

Those of ordinary skill in the art may realize that the units of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two, in order to clearly illustrate the interchangeability of hardware and software In the above description, the composition and steps of each example have been generally described in terms of function. Whether these functions are executed in hardware or software depends on the specific application of the technical solution and design constraints. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

In the several embodiments provided in this application, it should be understood that the disclosed system and device may be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a division of logical functions. In actual implementation, there may be other divisions, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections may be indirect couplings or communication connections through some interfaces, devices, or units, and may also be electrical, mechanical, or other forms of connection.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments of the present application.

In addition, the 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 above integrated unit may be implemented in the form of hardware or software functional unit.

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

The above is only the specific implementation of this application, but the scope of protection of this application is not limited to this, any person skilled in the art can easily think of various equivalents within the technical scope disclosed in this application Modifications or replacements, these modifications or replacements should be covered within the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A fingerprint identification device, characterized in that the fingerprint identification device is arranged below the display screen so that its fingerprint collection area is at least partially within the display area of the display screen, and the fingerprint identification device includes:

A support member, one end of the support member is used to connect to the display screen, and the other end of the support member is used to connect to the circuit board under the fingerprint identification device; the support member is provided with a fixing structure, the fixing The structure is used to fix the optical collimator;

An optical fingerprint sensor is provided on the circuit board and is used to detect the light signal reflected by the object above the fingerprint collection area;

The optical collimator is arranged in the fixed structure, so that the optical collimator is arranged above the optical fingerprint sensor, and the distance between the optical collimator and the display screen and The distance between the optical collimator and the optical fingerprint sensor satisfies the imaging requirements of the optical collimator, and the optical collimator is used to guide the optical signal from the fingerprint collection area to the optical fingerprint sensor.
The fingerprint identification device according to claim 1, wherein the supporting member comprises two brackets, and the fixing structure is a convex portion extending along inner walls of the two brackets, wherein the optical The straightener is fixed on the upper surface or the lower surface of the protrusion.
The fingerprint recognition device according to claim 1 or 2, characterized in that the fingerprint recognition device further comprises an optical filter provided above the optical fingerprint sensor for selecting the optical signal transmitted to the optical fingerprint sensor Of the wavelength,

Wherein, when the optical collimator is fixed on the upper surface of the convex portion, the optical filter is fixed on the lower surface of the convex portion, or the optical filter is provided on the optical fingerprint sensor The upper surface of; or,

When the optical collimator is fixed on the lower surface of the convex portion, the optical filter is fixed on the upper surface of the convex portion, or the optical filter is provided on the optical fingerprint sensor surface.
The fingerprint identification device according to claim 3, wherein:

The optical collimator is fixed on the upper surface or the lower surface of the convex portion, and includes: the non-light-transmissive area at the edge of the optical collimator is pasted on the upper surface or the lower surface of the convex portion through an opaque adhesive surface;

The optical filter is fixed on the upper surface or the lower surface of the convex portion, and includes: the non-light-transmissive area at the edge of the filter is pasted on the upper surface or the lower surface of the convex portion through an opaque adhesive material;

The optical filter is disposed on the upper surface of the optical fingerprint sensor, and includes: the optical filter is pasted on the upper surface of the optical fingerprint sensor through a transparent adhesive material.
The fingerprint recognition device according to any one of claims 1 to 4, wherein the optical fingerprint recognition device is pasted on the lower surface of the display screen by an opaque pasting material.
The fingerprint identification device according to any one of claims 1 to 5, wherein the optical fingerprint identification device further comprises a wire, and the wire is used to electrically connect the optical fingerprint sensor and the circuit board.
A fingerprint identification device, characterized in that the fingerprint identification device is arranged below the display screen so that its fingerprint collection area is at least partially within the display area of the display screen, and the fingerprint identification device includes:

An optical fingerprint sensor is provided on the base of the fingerprint identification device and is used to detect the light signal reflected by the object above the fingerprint collection area;

An optical collimator is provided above the optical fingerprint sensor for guiding the optical signal from the fingerprint collection area to the optical fingerprint sensor, the optical collimator and the optical fingerprint sensor are packaged together, Or the optical collimator is provided above the optical fingerprint sensor as a relatively independent component from the optical fingerprint sensor;

Wherein, the distance between the optical collimator and the display screen and the distance between the optical collimator and the optical fingerprint sensor meet the imaging requirements of the optical collimator.
The fingerprint identification device according to claim 7, characterized in that the fingerprint identification device further comprises an optical filter provided above the optical fingerprint sensor for selecting the wavelength of the optical signal transmitted to the optical fingerprint sensor ,

Wherein the optical filter and the optical fingerprint sensor are packaged together, and the optical collimator is provided above the optical filter as a relatively independent component from the optical filter and the optical fingerprint sensor; or ,

The optical collimator and the optical fingerprint sensor are packaged together, and the optical filter is provided above the collimator as a relatively independent component from the optical collimator and the optical fingerprint sensor; or,

The optical collimator, the optical filter and the optical fingerprint sensor are packaged together.
The fingerprint identification device according to claim 8, characterized in that the components packaged together are pasted together by a transparent adhesive material, and the non-light-transmissive areas at the edges of the relatively independent components are passed by an opaque adhesive material Paste on the upper surface of the packaging material.
The fingerprint recognition device according to any one of claims 7 to 9, wherein

The fingerprint identification device is pasted on the lower surface of the display screen through an opaque pasting material.
The fingerprint identification device according to any one of claims 7 to 10, wherein the optical fingerprint identification device further comprises a wire, and the wire is used to electrically connect the optical fingerprint sensor and the substrate.
The fingerprint identification device according to any one of claims 7 to 11, wherein the substrate is connected to the circuit board below the fingerprint identification device by soldering.
An electronic device, characterized in that it includes:

Self-illuminating display, and

The fingerprint recognition device according to any one of claims 1 to 6, or the fingerprint recognition device according to any one of claims 7 to 12.
The electronic device according to claim 13, wherein the display screen is an organic light-emitting diode display OLED, and the light-emitting layer of the display screen includes a plurality of organic light-emitting diode light sources, wherein the fingerprint identification device uses at least part of The organic light emitting diode light source is used as an excitation light source for fingerprint identification.