CN110709860A - Fingerprint identification device and electronic equipment - Google Patents
Fingerprint identification device and electronic equipment Download PDFInfo
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- CN110709860A CN110709860A CN201980002481.0A CN201980002481A CN110709860A CN 110709860 A CN110709860 A CN 110709860A CN 201980002481 A CN201980002481 A CN 201980002481A CN 110709860 A CN110709860 A CN 110709860A
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- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
Abstract
A fingerprint identification device and an electronic device can prevent a flexible display screen from sinking due to finger pressing in the fingerprint identification process, and improve the optical fingerprint identification performance. The fingerprint identification device comprises: the optical fingerprint identification module comprises a supporting structure and an optical fingerprint identification module; the supporting structure is arranged below the flexible display screen and used for supporting the flexible display screen; the supporting structure is provided with a plurality of light-transmitting small holes, and the light-transmitting small holes are used for transmitting fingerprint optical signals returned by reflection or scattering of a human finger above the flexible display screen to the optical fingerprint identification module; the optics fingerprint identification module set up in a plurality of logical light aperture below for receive fingerprint light signal, wherein fingerprint light signal is used for detecting the fingerprint information of finger.
Description
Technical Field
The present application relates to the field of optical fingerprint technology, and more particularly, to an apparatus and an electronic device for fingerprint identification.
Background
In an Organic Light Emitting Diode (OLED) display screen, a screen in which a flexible material such as plastic or metal is used as a screen substrate is called a flexible screen, wherein the flexible screen includes two product forms of a curved screen and a foldable flexible screen. The screen of the curved screen is fixed and bent into a certain shape in the production process, and the cover plate adopts glass with a supporting function, so that the finished curved screen with the glass cover plate does not have the characteristic of flexibility. The cover plate of the foldable flexible screen is made of flexible transparent materials, and the finished foldable flexible screen with the flexible cover plate can still be bent and deformed.
However, in the foldable flexible screen, since the foldable flexible screen does not have a supporting force, the supporting structure is required to support the screen integrally, so that the screen is prevented from being deformed in the using process of a user. The existing optical fingerprint identification scheme is characterized in that a middle frame part of a fingerprint identification area is completely hollowed, and because no middle frame is arranged at the fingerprint identification area to support a screen, when a finger presses the fingerprint identification area, the screen can collapse, so that the screen display at the fingerprint identification area and the screen display at other areas have obvious differences, and the user experience is influenced. Meanwhile, due to the deformation of the screen in the fingerprint identification area in the use process, the transmission of fingerprint optical signals reflected by the finger is influenced, and the optical fingerprint identification performance is also deteriorated.
Therefore, how to solve the sinking of the flexible display screen caused by the pressing of the finger in the fingerprint identification process and improve the optical fingerprint identification performance is an urgent problem to be solved.
Disclosure of Invention
The embodiment of the application provides a fingerprint identification's device and electronic equipment, can solve sinking of the flexible display screen that the fingerprint identification in-process finger pressed the cause, and improve its optics fingerprint identification performance.
In a first aspect, an apparatus for fingerprint identification is provided, which is suitable for an electronic device having a flexible display screen, and includes: the optical fingerprint identification module comprises a supporting structure and an optical fingerprint identification module;
the supporting structure is arranged below the flexible display screen and used for supporting the flexible display screen;
the supporting structure is provided with a plurality of light-transmitting small holes, and the light-transmitting small holes are used for transmitting fingerprint optical signals returned by reflection or scattering of a human finger above the flexible display screen to the optical fingerprint identification module;
the optics fingerprint identification module set up in a plurality of logical light aperture below for receive fingerprint light signal, wherein fingerprint light signal is used for detecting the fingerprint information of finger.
According to the technical scheme, the supporting structure is arranged under the flexible display screen, the supporting structure is provided with the plurality of light through small holes, transmission of fingerprint light signals returned by reflection or scattering of a human finger above the display screen can be met, support can be provided for the flexible display screen in a fingerprint pressing area, influence of pressing on screen display is reduced, and fingerprint detection quality is improved.
In one possible implementation, the support structure is a middle frame of the electronic device.
In a possible implementation manner, an opening area is arranged on the supporting structure, and a plurality of light passing small holes are arranged on the opening area.
In a possible implementation manner, the upper surfaces of the support structures are on the same plane, and the lower surfaces of the support structures are formed with a step structure in the edge region of the opening region.
In a possible implementation manner, the plurality of light-passing apertures are used for transmitting a fingerprint light signal with a specific angle in the fingerprint light signals and blocking a fingerprint light signal with a non-specific angle in the fingerprint light signals.
In a possible implementation manner, the optical fingerprint identification module includes a plurality of pixel units, and the plurality of pixel units are configured to receive the specific-angle fingerprint optical signal.
In one possible implementation, the specific angle fingerprint light signal is a fingerprint light signal incident perpendicular to the plurality of light-passing apertures.
In one possible implementation, the depth to diameter ratio of the plurality of light passing apertures is greater than 10.
In one possible implementation, the center distance between any two adjacent light-passing apertures in the plurality of light-passing apertures is less than 1/2 λminWherein λ isminIs the minimum value of the fingerprint period.
In one possible implementation, the optical fingerprint identification module includes an optical lens assembly including at least one optical lens.
In one possible implementation, a field angle of each of the plurality of light passing apertures is greater than a field angle of the optical lens assembly.
In one possible implementation, the center distance of any adjacent light-passing aperture in the plurality of light-passing apertures is greater than 2 λmaxWherein λ ismaxIs the maximum value of the fingerprint period.
In a possible implementation manner, the plurality of light-passing small holes are circular small holes or polygonal small holes with the same size.
In one possible implementation, the plurality of light passing apertures are arranged at certain regular intervals.
In one possible implementation, the plurality of light passing apertures are arranged in any one or more of a cross arrangement, a matrix arrangement and a random arrangement.
In one possible implementation, the apparatus further includes: and the transparent soft adhesive layer is used for connecting the flexible display screen with the supporting structure.
In one possible implementation, the transparent soft glue layer extends into the plurality of light passing small holes.
In one possible implementation, the apparatus further includes: and the fixing component is used for fixing the optical fingerprint identification module on the supporting structure.
In one possible implementation manner, the opening area is arranged below the fingerprint detection area;
the optical fingerprint identification module is specifically used for receiving fingerprint light signals of the fingerprint detection area.
In a possible implementation manner, the center of the hole-opening area and the center of the fingerprint detection area are both located on the same vertical line perpendicular to the optical fingerprint identification module.
In a second aspect, an electronic device is provided, comprising: the fingerprint identification device comprises a flexible display screen and the first aspect or the fingerprint identification device in any possible implementation manner of the first aspect, wherein the fingerprint identification device is arranged below the flexible display screen.
In a possible implementation manner, the fingerprint identification device is disposed below the non-bending area of the flexible display screen.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device to which the embodiment of the present application is applied.
Fig. 2 is a partial structural schematic diagram of an electronic device according to an embodiment of the application.
Fig. 3 is a schematic structural diagram of an apparatus for fingerprint recognition according to an embodiment of the present application.
Fig. 4 is a schematic block diagram of another apparatus for fingerprint recognition according to an embodiment of the present application.
Fig. 5 is a schematic diagram of an arrangement of light passing apertures according to an embodiment of the present application.
Fig. 6 is a schematic block diagram of another apparatus for fingerprint recognition according to an embodiment of the present application.
Fig. 7 is a schematic block diagram of another apparatus for fingerprint recognition according to an embodiment of the present application.
Fig. 8 is a schematic block diagram of another apparatus for fingerprint recognition according to an embodiment of the present application.
Fig. 9 is a schematic block diagram of another apparatus for fingerprint recognition according to an embodiment of the present application.
FIG. 10 is a schematic block diagram of an electronic device according to an embodiment of the present application.
Fig. 11 is a schematic perspective structure diagram of an electronic device according to an embodiment of the present application.
Detailed Description
As the smart terminal moves into the era of flexible display screens, the screen of the electronic device is no longer limited to flat display, but develops towards the directions of Bendable (Bendable), "Foldable (Foldable)" and "Bendable (Rollable)", and the flexible display screen in the Bendable state can be bent at a fixed angle; and the foldable and bendable flexible display screen can be bent freely on one side and any side. Because the flexible display screen has the characteristics, the electronic equipment of the flexible display screen has more aesthetic property and portability, and has wide application prospect. Meanwhile, with the development of biometric technology, biometric identification, especially fingerprint identification, is applied to electronic devices more and more widely, so how to realize high-performance fingerprint identification on electronic devices with flexible screens has become a public need.
The application provides a fingerprint identification's device technical scheme suitable for flexible display screen, as a common application scene, the technical scheme of this application embodiment can use at smart mobile phone, panel computer, wearing equipment and other have flexible display screen's mobile terminal or other electronic equipment. 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.
In the electronic device, the fingerprint identification system of the embodiment of the application includes an optical fingerprint device, and the fingerprint identification device may be disposed in a partial area or an entire area below the flexible display screen, so as to form an Under-screen (Under-display) optical fingerprint system.
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
As shown in fig. 1, which is a schematic structural diagram of an electronic device to which the embodiment of the present invention is applicable, the electronic device 10 includes a flexible display screen 120, a fingerprint identification device 130, and a middle frame 140, where the flexible display screen 120 is specifically a flexible foldable display screen or a flexible bendable display screen, and both a substrate and a cover thereof are made of a flexible material, for example, the substrate is made of plastic or flexible metal, and the cover is made of a transparent inorganic thin film material. The middle frame 140 is used for supporting the flexible display 120 and preventing the flexible display from deforming when the user uses the flexible display. The middle frame 140 is provided with a window 141, and the fingerprint recognition device 130 is arranged in an area below the window 141.
In the embodiment of the present application, the fingerprint recognition device 130 includes an optical fingerprint sensor, the optical fingerprint sensor includes a sensing array 133 having a plurality of optical sensing units 131, and the area where the sensing array 133 is located or the sensing area thereof is the fingerprint detection area 103 of the fingerprint recognition device 130. The fingerprint detection area 103 is located partially or entirely in the area below the window 141. Optionally, the fingerprint detection area 103 is located in a display area of the flexible display 120.
As an alternative embodiment, the flexible display 120 may be a flexible display using a self-luminous display unit, such as a Flexible Organic Light Emitting Diode (FOLED) display. The fingerprint recognition device 130 can utilize the display unit (i.e. OLED light source) of the FOLED display 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection. When the finger 110 is pressed against the fingerprint detection area 103, the display 120 emits a beam of light 111 toward the target finger 110 above the fingerprint detection area 103, and the light 111 is reflected on the surface of the finger 110 to form reflected light or scattered light by the inside of the finger 110 to form scattered light. Because ridges (ridges) and valleys (valley) of the fingerprint have different light reflection capacities, reflected light 151 from ridges 101 and reflected light 152 from valleys 102 of the fingerprint have different light intensities, and after passing through the optical assembly, the reflected light is received by the sensing array 134 in the fingerprint recognition device 130 and converted into corresponding electric signals, i.e., fingerprint detection signals; fingerprint image data can be obtained based on the fingerprint detection signal, and fingerprint matching verification can be further performed, so that an optical fingerprint identification function is realized in the electronic device 10.
In other embodiments, the flexible display 120 may be a flexible display without a self-luminous display unit, such as a Flexible Liquid Crystal Display (FLCD) display. In order to support the under-screen fingerprint detection of the liquid crystal display, the optical fingerprint system of the electronic device 10 may further include an excitation light source for optical fingerprint detection, where the excitation light source may be specifically an infrared light source or a light source of specific wavelength non-visible light, which may be disposed below the backlight module of the liquid crystal display or in an edge area below the protective cover of the electronic device 10, and the fingerprint identification device 130 may be disposed below the edge area of the liquid crystal panel or the protective cover and guided through a light path so that the fingerprint detection light may reach the fingerprint identification device 130; alternatively, the fingerprint recognition device 130 may be disposed below the backlight module, and the backlight module may be perforated or otherwise optically designed to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the fingerprint recognition device 130 by a diffusion sheet, a brightness enhancement sheet, a reflection sheet, and other film layers. When the fingerprint recognition device 130 employs an internal light source or an external light source to provide an optical signal for fingerprint detection, the detection principle is consistent with the above description.
It should also be understood that, in the embodiments of the present application, the sensing array in the fingerprint identification device may also be referred to as a pixel array, and the optical sensing unit or the sensing unit in the sensing array may also be referred to as a pixel unit.
It should be noted that the fingerprint identification's in this application embodiment device also can be called optics fingerprint identification module, fingerprint collection device etc. but above-mentioned term mutual replacement.
When the fingerprint detection area 103 is located in the display area of the flexible display screen 120, there is a certain air gap because there is no support of the middle frame 140 between the fingerprint identification device 130 and the flexible display screen 120. In one possible implementation manner of the embodiment of the present application, for example, as shown in (a) of fig. 2, the window 141 and the fingerprint detection area 103 have the same shape and size, and are disposed right above the fingerprint detection area 103, and the window 141 is filled with air. When a finger of a user presses the fingerprint detection area 103 on the flexible display screen 120, the flexible display screen 120 collapses in the pressing area, so that the image display of the finger pressing area on the flexible display screen 120 is different from that of other areas, and the user experience is affected.
In another possible implementation manner of the embodiment of the present application, for example, as shown in (b) of fig. 2, the window 141 is disposed above the fingerprint detection area 103, and a transparent supporting material 142, such as transparent glass or resin, is filled in the window 141. In the process of manufacturing, since the transparent filling material 142 in the middle frame 140 and the window 141 cannot be manufactured at the same time, the process parameters need to be strictly controlled, and the height difference between the middle frame 140 and the transparent filling material 142 needs to be reduced. If the upper surface of the transparent filling material 142 is higher than the upper surface of the middle frame 140, the screen above the window 141 may bulge, which may affect the image display and the service life of the flexible display 120.
Based on this, this application provides a fingerprint identification's device and electronic equipment sets up bearing structure under flexible display screen bearing structure is last to set up a plurality of logical light apertures, can enough satisfy the optical signal transmission of fingerprint detection, improves the quality of fingerprint detection, can provide the support for the flexible display screen in fingerprint detection area again, reduces to press the influence to the screen display.
Hereinafter, the fingerprint identification apparatus according to the embodiment of the present application will be described in detail with reference to fig. 3 to 9.
It should be noted that, for the sake of understanding, the same structures are denoted by the same reference numerals in the embodiments shown below, and detailed descriptions of the same structures are omitted for the sake of brevity.
Fig. 3 is a schematic structural diagram of an apparatus 20 for fingerprint identification according to an embodiment of the present application, which is suitable for an electronic device with a flexible display screen.
As shown in fig. 3, the fingerprint recognition device 20 may include: a support structure 200 and an optical fingerprint recognition module 300;
the supporting structure 200 is disposed below the flexible display screen 120, and is used for supporting the flexible display screen 120;
the supporting structure 200 is provided with a plurality of light-transmitting small holes 210, and the light-transmitting small holes 210 are used for transmitting fingerprint light signals returned by reflection or scattering of a human finger above the display screen to the optical fingerprint identification module 300;
optical fingerprint identification module 300 set up in a plurality of logical light aperture 210 below for receive fingerprint light signal, wherein fingerprint light signal is used for detecting the fingerprint information of finger.
Alternatively, the support structure 200 may be the middle frame 140 in fig. 1.
Optionally, the support structure 200 may also be a support layer with sufficient strength to support and protect the flexible display screen 120. For example, the supporting structure 200 is a sheet-shaped steel sheet disposed below the flexible display screen, the area of the steel sheet is greater than or equal to the display area of the flexible display screen, and the steel sheet can completely support the entire display area of the flexible display screen 120.
It should be understood that the support structure 200 may be made of any material having a supporting function, and the embodiment of the present application is not limited thereto.
Optionally, an opening area 201 is disposed on the support structure 200, the opening area 201 is provided with a plurality of light-passing small holes 210, and the opening area 201 is polygonal or circular.
Optionally, the upper surfaces of the support structures 200 are on the same plane, and the lower surfaces of the support structures 200 extend at the edge region of the opening region 201 to form a step structure.
Optionally, the lower surface of the support structure 200 extends upward at the edge region of the opening region 201 to form a groove structure. For example, as shown in fig. 4 (a), the support structure 200 is a middle frame, the upper surface of the middle frame is on the same plane, and is used for supporting the flexible display screen 120 above the middle frame, the edge of the open area 201 on the lower surface of the middle frame is formed upwards to form a groove structure, so that the thickness of the support structure 200 at the open area 201 is smaller than that of other areas, and the lower surface of the support structure 200 at the open area 201 is higher than the lower surface of other areas. Under the condition, under the same process condition, the depth-diameter ratio of the light through small hole on the hole opening area can be reduced, and the fingerprint light signal received by the light through small hole can be increased.
Optionally, the lower surface of the support structure 200 extends downward at the edge region of the opening region 201 to form a convex structure. For example, as shown in (b) of fig. 4, the support structure 200 is a middle frame, the upper surface of the middle frame is on the same plane, and is used for supporting the flexible display screen 120 above the middle frame, the edge of the open area 201 of the lower surface of the middle frame is downward formed into a convex structure, so that the thickness of the support structure 200 at the open area 201 is greater than that of other areas, and the lower surface of the support structure 200 at the open area 201 is lower than that of other areas. In this case, under the same process conditions, the depth-to-diameter ratio of the light passing aperture in the aperture region can be increased, and the light selectivity of the light passing aperture can be enhanced.
Optionally, the plurality of light passing apertures 210 are circular apertures or polygonal apertures.
Alternatively, the plurality of light passing apertures 210 may be the same size and shape. It should be understood that the plurality of light-passing apertures 210 may also have different shapes and sizes, and the embodiment of the present application is not limited thereto.
Alternatively, the plurality of light passing apertures 210 are arranged at certain regular intervals. Adjacent light passing apertures 210 are spaced apart to provide support.
Optionally, the plurality of light-passing apertures 210 are arranged in any one or more of a cross arrangement, a matrix arrangement and a random arrangement.
For example, as shown in fig. 5 (a), the circular light-passing apertures 210 are all circular apertures with the same shape and size, and are arranged in a matrix, wherein the distance between every two adjacent circular light-passing apertures is the same.
Alternatively, as shown in fig. 5 (b), the circular light-passing apertures 210 are all circular apertures with the same shape and size, and are arranged in a crossed manner at intervals, wherein the distance between every two adjacent circular light-passing apertures is the same.
Alternatively, as a possible implementation manner, as shown in (c) of fig. 5, the plurality of circular light-passing apertures 210 are all square apertures with the same shape and size, and the plurality of square light-passing apertures are arranged in a matrix, wherein the distance between every two adjacent circular light-passing apertures is the same.
Alternatively, as shown in fig. 5 (d), the circular light-transmitting apertures 210 are all regular hexagonal apertures with the same shape and size, and the regular hexagonal light-transmitting apertures are arranged in a crossed manner at intervals, wherein the distance between every two adjacent regular hexagonal light-transmitting apertures is the same.
Optionally, a micro-nano machining process or a nano printing process may be adopted to prepare the plurality of light-transmitting small holes 210 on the opening region 201, specifically, the micro-nano machining process is adopted to perform photoetching on the support structure for the small hole pattern, and the support structure material at the small hole pattern is etched to form the plurality of light-transmitting small holes.
In the embodiment of the present application, the area of a plurality of light apertures 210 that lead to on the trompil area 201 is photosensitive area, is used for transmitting fingerprint light signal extremely optics fingerprint identification module 300, the area except that a plurality of light apertures 210 that lead to on the trompil area 201 is non-photosensitive area, can not transmit fingerprint light signal. It should be understood that the greater the ratio of the area of the photosensitive region to the area of the opening region, the greater the intensity of the fingerprint light signal transmitted to the light detecting array 320.
Optionally, as shown in fig. 6, in an embodiment of the present application, the optical fingerprint identification module 300 may include a light detection array 320, where the light detection array 320 includes a pixel array 322 of a plurality of pixel units 321, and the pixel array 322 of the plurality of pixel units 321 may be the sensing array 133 of the plurality of optical sensing units 131 in fig. 1. The pixel array 322, and the read circuit and other auxiliary circuits electrically connected to the pixel array, can be fabricated on a chip (Die) by a semiconductor process, such as an optical imaging chip or an optical fingerprint sensor. The pixel array 322 is specifically a Photo detector (Photo detector) array, which includes a plurality of Photo detectors distributed in an array, and the Photo detectors can be used as the pixel units 321 as described above.
Optionally, the optical fingerprint identification module 300 may further include an optical component 310, where the optical component 310 may be disposed above the pixel array of the light detection array 320, and may specifically include a light guide layer, a Filter layer (Filter), and other optical elements, where the Filter layer may be used to Filter out ambient light penetrating through a finger, and the light guide layer is mainly used to guide a fingerprint light signal reflected from a surface of the finger to the pixel array for optical detection.
Optionally, the light guide layer of the optical assembly 310 has multiple implementation schemes, for example, the light guide layer 311 may be specifically a Collimator (collimater) layer made of a semiconductor silicon wafer, and has multiple collimating units or a micro-hole array, where the collimating units may be specifically small holes, and in a fingerprint light signal reflected by a finger, a light ray perpendicularly incident to the collimating units may pass through and be received by a pixel unit below the collimating units, and a light ray with an excessively large incident angle is attenuated by multiple reflections inside the collimating units, so that each pixel unit 321 can basically only receive the fingerprint light signal directly above the collimating unit, and the pixel array 322 can detect a fingerprint image of the finger.
Optionally, 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, and is used to converge the fingerprint light signal reflected from the finger to the pixel array of the light detection array 320 therebelow, so that the pixel array 322 may perform imaging based on the fingerprint light signal, and thus process the fingerprint image signal of the finger. Optionally, the optical lens layer may further have a pinhole formed in an optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to enlarge a field of view of the optical fingerprint identification module 300, so as to improve a fingerprint imaging effect of the optical fingerprint identification module 300.
Alternatively, the light guide layer may also be a Micro-Lens (Micro-Lens) layer, the Micro-Lens layer has a Micro-Lens array formed by a plurality of Micro-lenses, which may be formed above the pixel array 322 of the light detection array 320 through a semiconductor growth process or other processes, and each Micro-Lens may correspond to one of the pixel units 321 of the pixel array 322. And another optical film layer, such as a dielectric layer or a passivation layer, may be further formed between the microlens layer and the pixel unit, and more specifically, a light blocking layer having micro holes may be further included between the microlens layer and the pixel unit, where the micro holes are formed between the corresponding microlenses and the pixel units, and the light blocking layer may block optical interference between the adjacent microlenses and the pixel units, and enable light rays corresponding to the pixel units to be converged inside the micro holes through the microlenses and transmitted to the pixel units through the micro holes for optical fingerprint imaging.
It should be understood that several implementations of the light guiding layer described above may be used alone or in combination, for example, a microlens layer may be further disposed below the collimator layer or the optical lens layer. Of course, when the collimator layer or the optical lens layer is used in combination with the microlens layer, the specific lamination structure or optical path thereof may need to be adjusted according to actual needs.
It should also be appreciated that in particular implementations, the optical assembly 310 may be packaged in the same optical fingerprint assembly as the light detection array 320. For example, the optical component 310 may be packaged in the same optical fingerprint chip as the optical detection portion 134, or the optical component 310 may be disposed outside the chip on which the light detection array 320 is located, for example, the optical component 310 is attached to the chip, or some components of the optical component 310 are integrated into the chip. The embodiment of the present application is not limited.
Optionally, as shown in fig. 6, the fingerprint recognition device 20 may further include a transparent adhesive layer 400 for connecting the flexible display 120 and the support structure 200. The supporting structure 200 can be fully laminated with the flexible display screen 120 through the transparent soft adhesive layer 400, and the transparent soft adhesive layer 400 can be a transparent and soft silica gel layer, and can also be other transparent liquid glue or transparent soft glue.
Optionally, the plurality of light-passing small holes 210 on the support structure 200 may be filled with the transparent soft glue layer 400, or may be filled with air.
Optionally, as shown in fig. 6, the fingerprint recognition device 20 may further include a fixing component 500, where the fixing component 500 is used to fix the optical fingerprint recognition module 300 on the supporting structure 200. Optionally, when the supporting structure 200 is a middle frame, the optical fingerprint identification module 300 may be fixed on the supporting structure 200 in a screw mounting and fixing manner, a glue material attaching and fixing manner, a welding and fixing manner, or a coupling and fixing manner. The fixing component 500 may be a component structure corresponding to the above fixing manner.
In the present application, when the structures in the optical fingerprint recognition module 300 are different, the design schemes of the shapes and the sizes of the plurality of light passing holes are different.
Optionally, as a specific embodiment, as shown in fig. 7, the optical fingerprint identification module 300 includes a light detection array 320, and the light detection array 320 includes a plurality of pixel units 321. In the embodiment of the present application, the plurality of light-passing apertures 210 are used for transmitting the fingerprint light signals at a specific angle and blocking the fingerprint light signals at a non-specific angle. A plurality of pixel cells 321 in the light detecting array 320 receive the specific angle fingerprint light signal.
Optionally, the specific angle fingerprint light signal comprises a fingerprint light signal incident perpendicular to the plurality of light passing apertures 210. Optionally, the specific angle fingerprint light signal further comprises a light signal incident substantially perpendicular to the plurality of light passing apertures 210.
It should be understood that the specific angle fingerprint light signal may also include a fingerprint light signal incident non-perpendicularly to the plurality of light-passing small holes 210, which is not limited by the embodiment of the present application.
For example, the plurality of light-passing apertures 210 are used for transmitting fingerprint light signals incident substantially perpendicular to the plurality of light-passing apertures, the plurality of light-passing apertures 210 may also be referred to as collimators, and each light-passing aperture 210 is a collimating unit. Specifically, the fingerprint light signals that are incident on the plurality of light-passing apertures 210 substantially perpendicularly are transmitted to the plurality of pixel units 321 by the plurality of light-passing apertures 210, while the light signals that are incident on the plurality of light-passing apertures 210 at a large angle are attenuated by multiple reflections inside the plurality of light-passing apertures 210 and cannot be transmitted to the plurality of pixel units 321, so that each pixel unit 321 receives the fingerprint light signal directly above it, and the plurality of pixel units 321 can detect the fingerprint image of the finger.
In the embodiment of the present application, when the light-passing aperture is a polygonal aperture, the diameter of the light-passing aperture 210 is the minimum diameter of the light-passing aperture 210. When the plurality of light-transmitting small holes 210 are identical in shape and size and are arranged in an array, the period of the plurality of light-transmitting small holes 210 is the central distance between two adjacent light-transmitting small holes; when the plurality of light-passing apertures 210 are different in shape and size, the center distances of two adjacent light-passing apertures are different, wherein the minimum center distance is the period of the plurality of light-passing apertures 210.
Optionally, the diameter of the plurality of light-passing small holes 210 is larger than a first preset value so as to transmit enough light for imaging. The diameter of the plurality of light-passing apertures 210 is also smaller than a second preset value so as to ensure that light signals incident to the plurality of light-passing apertures 210 at large angles are blocked. The period of the light-transmitting holes 210 is still less than a third preset value to be distinguished from the period of the fingerprint lines, so that the processing of the fingerprint image is facilitated. That is, the parameters of the light passing apertures 210 may be set such that the fingerprint light signal of a fingerprint ridge and/or a fingerprint valley incident substantially vertically downwards in the corresponding area above the optical fingerprint identification module 300 is maximally transmitted to the light detecting array 320, and the other light signals are maximally blocked.
Optionally, the fingerprint period length of the finger fingerprint is λminTo lambdamaxThe distance between two adjacent ridges or two adjacent valleys on the fingerprint is at least lambdaminA period of said plurality of light passing apertures 210 being less than 1/2 λminSaid 1/2 λminThe third preset value is obtained. For example, the fingerprint of the finger has a minimum fingerprint period of 200 μm, and when the plurality of light passing holes 210 are as shown in (a) and (b) of fig. 5, the center distance between a circular light passing hole and a circular light passing hole adjacent thereto is less than 100 μm.
Optionally, the depth of the plurality of light-passing small holes 210 is D, that is, the thickness of the support structure is D, and the depth-diameter ratio of the plurality of light-passing small holes 210 is greater than or equal to 10, that is, the depth-diameter ratio of the plurality of light-passing small holes 210 is greater than or equal to 10. The above-mentioned first preset value and second preset value are determined by calculating the depth-diameter ratio of the plurality of light-passing small holes 210. Alternatively, the thickness D of the support structure may be set according to the diameter of the plurality of light passing apertures 210.
Optionally, in this embodiment of the present application, the optical fingerprint identification module 300 may further include an optical component 310, wherein the optical component 310 may include a collimating layer 311 for further selecting the incident fingerprint optical signal.
Alternatively, the plurality of apertures on the collimating layer 311 may be the same in shape and size and correspond to the plurality of light passing apertures 210 on the support structure 200 one to one. Optionally, the plurality of small holes on the collimating layer 311 may be smaller than the plurality of light-passing small holes 210 on the supporting structure 200, for example, one light-passing small hole 210 corresponds to the plurality of small holes on the collimating layer, that is, the plurality of small holes on the collimating layer all receive the optical signal transmitted by the same light-passing small hole.
Optionally, the optical assembly 310 may further include a filter layer 312. Optionally, the filter layer 312 may be an infrared cut-off filter for filtering optical signals in an infrared band, which is beneficial to reducing the influence of ambient optical signals such as infrared light, and thus can improve the fingerprint identification performance. The filter layer 312 may be disposed between the collimating layer 311 and the light detecting array 320, or may be disposed above the collimating layer 311. For example, a blue filter material may be coated on the top of the light detecting array 320, or a blue filter may be disposed, so that the fingerprint image collected by the light detecting array 320 is a blue fingerprint image, i.e., the fingerprint light signals in the red and blue bands and the infrared band are filtered out.
Optionally, in this embodiment, the fingerprint recognition device 20 may further include a transparent soft adhesive layer 400 and a fixing assembly 500.
Optionally, as another specific embodiment, as shown in fig. 8, the optical fingerprint identification module 300 includes an optical assembly 310 and a light detection array 320. The light detection array 320 includes a plurality of pixel units 321.
Optionally, the optical assembly 310 may include an optical lens assembly 313.
Optionally, the optical lens assembly 313 comprises at least one optical lens. For example, the optical lens assembly 313 is a lens group composed of one or more optical lenses, or the optical lens assembly 313 is a microlens array composed of a plurality of microlenses.
In this application embodiment, a plurality of logical light aperture 210 are used for transmitting on the regional 201 of trompil fingerprint light signal extremely optical lens subassembly 313, logical light aperture transmission fingerprint light signal unit, the light signal after partial regional reflection on the fingerprint light signal unit is the finger, optical lens subassembly 313 is a plurality of fingerprint light signal unit images, a plurality of pixel element 321 receive the process a plurality of formation of image fingerprint light signal unit of optical lens subassembly 313, and it is right a plurality of formation of image fingerprint light signal unit processes obtains fingerprint image signal.
Optionally, the depth-to-diameter ratio of the plurality of light passing apertures 210 is smaller than a fourth preset value, so as to enlarge a field of view (FOV) angle of the plurality of light passing apertures 210, and prevent loss of the fingerprint light signal of the finger portion area. The diameters of the light-transmitting small holes 210 are also smaller than a fifth preset value so as to ensure that the flexible display screen generates a depression to influence image display when a finger presses the light-transmitting small holes. The period of the light through holes is larger than a sixth preset value so as to be different from the period of the fingerprint lines, and the processing of the fingerprint image is facilitated. That is, the parameters of the plurality of light passing apertures 210 may be set such that the light detection array 320 receives the fingerprint light signals of the entire area of the finger maximally without affecting the display of the flexible display 120.
Optionally, the fingerprint period length of the finger fingerprint is λminTo lambdamaxI.e. two adjacent ridges or two adjacent valleys on the fingerprint, are spaced apart by a maximum of lambdamax. Of the plurality of light passing apertures 210, the period of the plurality of light passing apertures 210 is greater than 2 λmin2 λ of saidmaxNamely the sixth preset value. For example, when the fingerprint has a ridge period of at most 1mm and the plurality of light passing holes 210 are as shown in fig. 5 (a) and (b), the distance between the center of a circular light passing hole and the center of a circular light passing hole adjacent to the circular light passing hole is greater than 2 mm.
Optionally, the field angle of the plurality of light-passing small holes 210 is larger than the field angle of the optical lens assembly 313. In the embodiment of the present application, the depth-diameter ratio of the plurality of light-passing apertures 210 determines the field angle of the plurality of light-passing apertures, and when the depth of the light-passing aperture 210 is smaller and the diameter is larger, the field angle of the light-passing aperture 210 is larger. The depth-diameter ratio of the plurality of light-passing small holes 210 is determined by the angle of field, thereby determining the fourth preset value.
Optionally, the fifth preset value is determined by pressing effect of a finger on the flexible display screen 120 at the light-passing aperture.
Optionally, in this embodiment, the optical assembly 310 may further include a filter layer 312.
Optionally, in this embodiment, the fingerprint recognition device 20 may further include a transparent soft adhesive layer 400 and a fixing assembly 500.
In the embodiment of the present application, the sensing area of the pixel array 322 in the light detection array 320 on the flexible display screen 120 is the fingerprint detection area 301 of the optical fingerprint identification module 300, that is, when a finger is placed in the fingerprint detection area 301 on the flexible display screen 120, the pixel array 322 in the light detection array 320 can receive a fingerprint optical signal reflected by the finger.
Alternatively, as shown in fig. 9, the fingerprint detection area 301 is located in the display area of the flexible display 120.
Optionally, as a possible implementation manner, as shown in fig. 9, the optical fingerprint identification module 300 is disposed below the display area of the flexible display screen 120.
Optionally, as another possible embodiment, the optical fingerprint identification module 300 may also be disposed at other positions, such as a side surface of the flexible display screen 120 or an edge opaque area of an electronic device, and guide the fingerprint optical signal reflected by the finger to the optical fingerprint identification module 300 through an optical path design, so that the fingerprint detection area 301 is actually located in a display area of the flexible display screen 120.
Alternatively, the area of the fingerprint detection region 301 may be the same as the area of the pixel array 322, for example, the shape and size of the fingerprint detection region 301 is the same as the shape and size of the pixel array 322, and is located directly above the pixel array 322.
Optionally, the area of the fingerprint detection area 301 may also be different from the area of the pixel array 322, for example, the area of the fingerprint detection area 301 may be larger than the area of the pixel array 322 by an optical path design such as lens imaging, a reflective folded optical path design, or other optical path designs such as light converging or reflecting.
Therefore, when the user needs to unlock or verify other fingerprints of the electronic device, the user only needs to press a finger on the fingerprint detection area 301 of the flexible display screen 120, so as to realize fingerprint input. Because fingerprint detection can be realized under the screen, the electronic device adopting the structure does not need a special reserved space on the front surface to set a fingerprint key (such as a Home key), so that a full-screen scheme can be adopted, namely the display area of the flexible display screen 120 can be basically expanded to the front surface of the whole electronic device.
Optionally, the light detection array 320 in the optical fingerprint recognition module 300 can be an optical fingerprint sensor, and the area of the fingerprint detection area 301 of the optical fingerprint recognition module 300 is small and the position is fixed.
Optionally, the light detection array 320 in the optical fingerprint identification module 300 may specifically include a plurality of optical fingerprint sensors; a plurality of optical fingerprint sensor can set up side by side through the concatenation mode partial area or the total area of the below of flexible display screen 120, just a plurality of optical fingerprint sensor's response area constitutes optical fingerprint identification module 300's fingerprint detection area 301 jointly. That is to say, the fingerprint detection area 301 of optics fingerprint identification module 300 can include a plurality of subregions, and every subregion corresponds to one of them optics fingerprint sensor's induction zone respectively to the fingerprint detection area 301 with optics fingerprint identification module 300 can extend to the main area of the lower half of flexible display screen 120, extend to the finger and press the region promptly, thereby realize blind formula fingerprint input operation. Alternatively, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 301 may also be extended to half or even the entire display area, thereby enabling half-screen or full-screen fingerprint detection.
Alternatively, as shown in fig. 9, the perforated area 201 is disposed below the fingerprint detection area 301.
Optionally, the opening area 201 is disposed right below the fingerprint detection area 301, and a center of the opening area 201 and a center of the fingerprint detection area 301 are both located on a same vertical line perpendicular to the pixel array 322.
Optionally, the shape and size of the opening area 201 are the same as the shape and size of the fingerprint detection area 301, as a possible implementation manner, the shape and size of the fingerprint detection area 301, the opening area 201, and the pixel array 322 are the same, and the center of the fingerprint detection area 301, the center of the opening area 201, and the center of the pixel array 322 are all located on the same vertical line perpendicular to the pixel array 322.
Optionally, the shape and size of the opening area 201 are different from the fingerprint detection area 301. For example, the opening area is square, and the fingerprint detection area is circular.
As shown in fig. 10, an electronic device 30 is further provided in the embodiment of the present application, and the electronic device 30 may include a flexible display screen 120 and the fingerprint identification apparatus 20 according to the embodiment of the present application, where the fingerprint identification apparatus 20 is disposed below the flexible display screen 120.
The electronic device 30 may be any electronic device having a flexible display screen 120. When the flexible display 120 is foldable, the electronic device 30 may also be referred to as a foldable electronic device.
The foldable electronic device 30 has a plurality of folding forms and appearance forms, as shown in fig. 11, the first region 121 on the flexible display 120 is a bending region of the flexible display 120, and the second region 122 and the third region 123 on the flexible display 120 are non-bending regions of the flexible display 120. Fig. 11 (a) is an external view of the flip-up foldable electronic device 30, and the flexible display 120 is on the surface of the electronic device when the electronic device is in the folded state. Fig. 11 (a) is an external view of the flip-in foldable electronic device 30, and the flexible display 120 is inside the electronic device when the electronic device assumes the folded state.
Optionally, the fingerprint recognition device 20 is provided with a non-bending area of the flexible display 120, for example, in all or a partial area below the second area 122 and/or the third area 123. As shown in fig. 11 (a), the fingerprint recognition device 20 is disposed in a partial area below the third area 123. As shown in fig. 11 (b), the fingerprint recognition device 20 is disposed in a partial area below the second area 122.
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 (22)
1. An apparatus for fingerprint identification, which is suitable for an electronic device with a flexible display screen, comprising: the optical fingerprint identification module comprises a supporting structure and an optical fingerprint identification module;
the supporting structure is arranged below the flexible display screen and used for supporting the flexible display screen;
the supporting structure is provided with a plurality of light-transmitting small holes, and the light-transmitting small holes are used for transmitting fingerprint optical signals returned by reflection or scattering of a human finger above the flexible display screen to the optical fingerprint identification module;
the optics fingerprint identification module set up in a plurality of logical light aperture below for receive fingerprint light signal, wherein fingerprint light signal is used for detecting the fingerprint information of finger.
2. The apparatus of claim 1, wherein the support structure is a bezel of the electronic device.
3. The device of claim 1 or 2, wherein the support structure is provided with an opening area, and the opening area is provided with a plurality of light-passing small holes.
4. The device of claim 3, wherein the upper surface of the support structure is in the same plane and the lower surface of the support structure is formed with a step structure at the edge region of the open region.
5. The apparatus according to any one of claims 1-4, wherein the plurality of light-passing apertures are configured to transmit specific angle fingerprint light signals of the fingerprint light signals and block non-specific angle fingerprint light signals of the fingerprint light signals.
6. The apparatus of claim 5, wherein the optical fingerprint identification module comprises a plurality of pixel units configured to receive the specific-angle fingerprint light signal.
7. The apparatus of claim 5 or 6, wherein the specific angle fingerprint light signal is a fingerprint light signal incident perpendicular to the plurality of light-passing apertures.
8. The apparatus of any one of claims 5-7, wherein the plurality of light passing apertures have a depth to diameter ratio greater than 10.
9. The device of any one of claims 5-8, wherein the center distance of any adjacent two of the plurality of light passing apertures is less than 1/2 λminWherein λ isminIs the minimum value of the fingerprint period.
10. The device of claims 1-4, wherein the optical fingerprint identification module comprises an optical lens assembly comprising at least one optical lens.
11. The apparatus of claim 10, wherein a field angle of each of the plurality of light passing apertures is greater than a field angle of the optical lens assembly.
12. The apparatus of claim 10 or 11, wherein the center distance of any adjacent light passing aperture of the plurality of light passing apertures is greater than 2 λmaxWherein λ ismaxIs the maximum value of the fingerprint period.
13. The device according to any one of claims 1 to 12, wherein the plurality of light passing apertures are circular apertures or polygonal apertures of the same size.
14. The device of any one of claims 1-13, wherein the plurality of light passing apertures are arranged at specific regular intervals.
15. The device according to any one of claims 1 to 14, wherein the plurality of light passing apertures are arranged in any one or more of a cross arrangement, a matrix arrangement and a random arrangement.
16. The apparatus of any one of claims 1-15, further comprising:
and the transparent soft adhesive layer is used for connecting the flexible display screen with the supporting structure.
17. The apparatus of claim 16, wherein the transparent soft gel layer extends into the plurality of light passing apertures.
18. The apparatus of any one of claims 1-17, further comprising:
and the fixing component is used for fixing the optical fingerprint identification module on the supporting structure.
19. The device of any one of claims 3-18, wherein the apertured area is disposed below a fingerprint detection area;
the optical fingerprint identification module is specifically used for receiving fingerprint light signals of the fingerprint detection area.
20. The apparatus of claim 19, wherein the center of the aperture area and the center of the fingerprint detection area are both located on a same vertical line perpendicular to the optical fingerprint identification module.
21. An electronic device, comprising: a flexible display screen and a display device,
the fingerprint recognition device according to any one of claims 1 to 20, wherein said fingerprint recognition device is disposed below said flexible display.
22. The electronic device of claim 21, wherein the fingerprint recognition device is disposed below a non-bending region of the flexible display screen.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2019/079598 WO2020191601A1 (en) | 2019-03-25 | 2019-03-25 | Fingerprint recognition apparatus and electronic device |
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| CN110709860A true CN110709860A (en) | 2020-01-17 |
| CN110709860B CN110709860B (en) | 2023-12-19 |
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| WO2023206100A1 (en) * | 2022-04-26 | 2023-11-02 | 京东方科技集团股份有限公司 | Display module and display apparatus |
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| CN110709860B (en) | 2023-12-19 |
| WO2020191601A1 (en) | 2020-10-01 |
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