CN212749851U

CN212749851U - Fingerprint identification device and electronic equipment

Info

Publication number: CN212749851U
Application number: CN201921819297.9U
Authority: CN
Inventors: 曾媛媛
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2019-04-30
Filing date: 2019-10-25
Publication date: 2021-03-19
Anticipated expiration: 2029-10-25
Also published as: CN110799988A; CN110799988B; WO2020220304A1

Abstract

The utility model provides a fingerprint identification's device and electronic equipment, this fingerprint identification's device is applied to the electronic equipment that has flexible display screen, can realize the screen fingerprint identification down of flexible display screen. The device comprises: the device comprises: a support structure for being disposed at least partially within the light-transmissive region below the flexible display screen, the support structure for supporting the flexible display screen; the optical fingerprint module is used for setting up on the bearing structure, the optical fingerprint module is used for gathering the warp the finger reflection or the scattering of flexible display screen top are followed the light signal that light transmission region transmitted comes.

Description

Fingerprint identification device and electronic equipment

This application claims priority from the PCT application with the application number PCT/CN2019/085291, entitled "fingerprint recognition device and electronic device", filed by the chinese patent office on 30/04 in 2019, which is incorporated herein by reference in its entirety.

Technical Field

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

Background

The technology for identifying the fingerprints under the optical screen is that light emitted by an optical fingerprint module is collected by a light source and reflected light formed by reflection is generated on a finger above a display screen, and fingerprint information of the finger is carried in the reflected light, so that the fingerprints under the screen are identified. To the electronic equipment who adopts flexible display screen, when pressing the fingerprint identification on flexible display screen when pointing, because the material of flexible display screen is soft, consequently pressing the regional deformation that can take place at the finger, not only influence user experience, still influence the fingerprint identification performance of optics fingerprint module, probably cause the impaired of flexible display screen and optics fingerprint module even.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a fingerprint identification's device and electronic equipment, can realize fingerprint identification under the screen of flexible display screen.

In a first aspect, a fingerprint identification apparatus is provided, which is applied to an electronic device having a flexible display screen, and includes:

a support structure for being disposed at least partially within the light-transmissive region below the flexible display screen, the support structure for supporting the flexible display screen;

the optical fingerprint module is used for setting up on the bearing structure, the optical fingerprint module is used for gathering the warp the finger reflection or the scattering of flexible display screen top are followed the light signal that light transmission region transmitted comes.

In one possible implementation, the support structure is a boss structure, and the protruding portion of the boss structure is located in the light transmission region.

In one possible implementation, the raised portion is located below a foam layer of the flexible display screen.

In a possible implementation manner, the edge of the protruding portion is connected with the foam layer of the flexible display screen through foam or an adhesive film.

In one possible implementation, the non-protruding portion of the boss structure is located below a middle frame of the electronic device.

In a possible implementation manner, the upper surface of the non-protruding part is adhered to the lower surface of the middle frame through glue or a glue film.

In a possible implementation manner, a metal sheet is arranged between the flexible display screen and a middle frame of the electronic device, a light-transmitting window is arranged on the metal sheet, the light-transmitting window is located in the light-transmitting area, and the non-protruding portion is located below the metal sheet.

In one possible implementation, the upper surface of the non-protruding part is adhered to the lower surface of the metal sheet by glue or a glue film.

In one possible implementation, the protruding portion is formed by cured glue, and the non-protruding portion is a transparent flat plate adhered below the protruding portion.

In a possible implementation manner, the protruding portion is formed by filling the glue before curing inside the light-transmitting window of the metal sheet and curing the glue.

In one possible implementation, the upper surface of the boss is the same height as the upper surface of the metal sheet.

In a possible implementation manner, the protruding portion and the upper surface of the metal sheet are covered with an overflow glue layer formed by the glue overflowing out of the light-transmitting window of the metal sheet before curing.

In one possible implementation, the glue is an ultraviolet curing UV glue.

In one possible implementation, the boss structure is integrally made of a transparent material.

In one possible implementation, the transparent material is transparent glass or resin.

In one possible implementation, a spacer layer is present between the flexible display and the support structure.

In one possible implementation, the spacer layer is an air spacer layer.

In a possible implementation manner, at least one through hole is disposed on the spacing layer, and the at least one through hole is used for transmitting the optical signal.

In one possible implementation, the spacer layer is a foam layer or a metal layer.

In a possible implementation manner, a plurality of through holes are arranged on the supporting structure, and the through holes are used for transmitting the optical signals.

In one possible implementation, the support structure is a foam layer or a metal layer.

In one possible implementation, the apparatus further includes: and the buffer layer is arranged between the flexible display screen and the support structure.

In one possible implementation, the buffer layer is fixed on the lower surface of the flexible display screen.

In one possible implementation, the spacer layer is located between the buffer layer and the support structure.

In one possible implementation, the cushioning layer is fixed to an upper surface of the support structure.

In one possible implementation, the spacer layer is located between the buffer layer and the flexible display screen.

In one possible implementation manner, the upper surface of the buffer layer is attached to the lower surface of the flexible display screen, and the lower surface of the buffer layer is attached to the upper surface of the protruding portion of the boss structure.

In one possible implementation, the buffer layer includes one or more layers of transparent film.

In one possible implementation, the optical fingerprint module is fixed on the lower surface of the supporting structure.

In a second aspect, a method for manufacturing a support structure for supporting a flexible display screen of an electronic device is provided, where the support structure is a boss structure, and the method includes:

horizontally placing a metal sheet arranged below the flexible display screen on one side of an auxiliary flat plate, wherein the auxiliary flat plate covers a light-transmitting window of the metal sheet;

the glue in a liquid state is poured into the part, located in the light-transmitting window, of the auxiliary flat plate;

covering a transparent flat plate on the light-transmitting window from the other side of the auxiliary flat plate so that the glue in a liquid state fills the light-transmitting window;

and curing the glue in a liquid state to obtain the boss structure, wherein the bulge part of the boss structure is the cured glue, and the non-bulge part of the boss structure is the transparent flat plate.

In one possible realization the upper surface of the projection is at the same height as the upper surface of the metal sheet.

In one possible implementation the glue is a curing glue, such as a thermosetting glue or a UV glue.

In one possible implementation the transparent plate is made of transparent glass or transparent resin.

In a third aspect, a terminal device is provided, which includes:

a flexible display screen; and an apparatus for fingerprinting in the first aspect or any possible implementation manner of the first aspect.

In one possible implementation, the electronic device further includes a middle frame.

In one possible implementation manner, a metal sheet is arranged between the flexible display screen and the middle frame.

Based on above-mentioned technical scheme, through set up bearing structure in the printing opacity region of flexible display screen below for bearing structure can provide the supporting role for flexible display screen, reduces the deformation that the finger pressed flexible display screen and leads to among the fingerprint identification process, avoids the damage to flexible display screen. And, because optics fingerprint module sets up on bearing structure, consequently can adjust the distance between optics fingerprint module and the flexible display screen through bearing structure in a flexible way, improve fingerprint identification's performance. In addition, because decoupling zero has been between optical fingerprint module and the flexible display screen, the dismantlement and the installation of the optical fingerprint module of being convenient for are favorable to the maintenance of optical fingerprint module.

Drawings

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

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

Fig. 3 is a schematic block diagram of an apparatus for fingerprint identification according to an embodiment of the present application.

Fig. 4 is a schematic diagram of a possible structure of the fingerprint identification device according to the embodiment of the present application.

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

Fig. 6 is a schematic diagram of various components of the apparatus for fingerprint recognition in fig. 5.

Fig. 7 is a schematic diagram of a possible structure of a fingerprint identification device according to an embodiment of the present application.

Fig. 8(a) to 8(c) are schematic views of a buffer layer according to an embodiment of the present disclosure.

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

Fig. 10 is a schematic diagram of a possible structure of a fingerprint identification device according to an embodiment of the present application.

Fig. 11 is a schematic flow chart of a method of fabricating a support structure according to an embodiment of the present application.

Fig. 12 is a plan view of a metal sheet of an embodiment of the present application.

FIG. 13 is a schematic view of a mesa structure formed using the method of FIG. 11.

Fig. 14 is a schematic view of a boss structure fabricated based on the method shown in fig. 11.

Fig. 15 is a schematic illustration of an overfill glue layer.

Fig. 16 is a schematic diagram of a possible structure of a fingerprint identification device according to an embodiment of the present application.

Fig. 17 is a schematic diagram of a possible structure of a fingerprint identification device according to an embodiment of the present application.

Fig. 18 is a schematic diagram of a possible structure of a fingerprint identification device according to an embodiment of the present application.

Detailed Description

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

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

As a common application scenario, the optical fingerprint system provided by the embodiment of the application can be applied to smart phones, tablet computers and other mobile terminals or other terminal devices with display screens; more specifically, in the terminal device, the optical fingerprint module may be specifically an optical fingerprint module, which may be disposed in a partial area or a whole area below the display screen, so as to form an Under-screen (Under-display or Under-screen) optical fingerprint system. Or, the optical fingerprint module can also be partially or completely integrated inside the display screen of the terminal device, so as to form an In-display or In-screen optical fingerprint system.

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

The terminal device 10 includes a display screen 120 and an optical fingerprint module 130. Wherein, the optical fingerprint module 130 is disposed in a local area below the display screen 120. The optical fingerprint module 130 includes an optical fingerprint sensor including a sensing array 133 having a plurality of optical sensing units 131. The sensing array 133 is located in an area or a sensing area thereof, which is the fingerprint detection area 121 (also called a fingerprint collection area, a fingerprint identification area, etc.) of the optical fingerprint module 130. As shown in fig. 1, the fingerprint detection area 121 is located in the display area of the display screen 120. In an alternative embodiment, the optical fingerprint module 130 may be disposed at other positions, such as the side of the display screen 120 or the edge opaque area of the terminal device 10, and the optical path is designed to guide the optical signal from at least a part of the display area of the display screen 120 to the optical fingerprint module 130, so that the fingerprint detection area 121 is actually located in the display area of the display screen 120.

It should be understood that the area of the fingerprint detection area 121 may be different from the area of the sensing array 133 of the optical fingerprint module 130, for example, the area of the fingerprint detection area 121 of the optical fingerprint module 130 may be larger than the area of the sensing array 133 of the optical fingerprint module 130 through 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. In other alternative implementations, if the light path is guided by, for example, light collimation, the fingerprint detection area 121 of the optical fingerprint module 130 may be designed to substantially coincide with the area of the sensing array of the optical fingerprint module 130.

Therefore, when the user needs to unlock or verify other fingerprints of the terminal device, the user only needs to press a finger on the fingerprint detection area 121 of the display screen 120, so as to realize fingerprint input. Since fingerprint detection can be implemented in the screen, the terminal device 10 with the above structure does not need to reserve a special space on the front surface thereof to set a fingerprint key (such as a Home key), so that a full-screen scheme can be adopted, that is, the display area of the display screen 120 can be basically extended to the front surface of the whole terminal device 10.

As an alternative implementation, as shown in FIG. 1, the optical fingerprint module 130 includes a light detection portion 134 and an optical assembly 132. The light detecting portion 134 includes the sensing array 133 and a reading circuit and other auxiliary circuits electrically connected to the sensing array 133, which can be fabricated on a chip (Die) by a semiconductor process, such as an optical imaging chip or an optical fingerprint sensor. The sensing array 133 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 optical sensing units as described above. The optical assembly 132 may be disposed above the sensing array 133 of the light detecting portion 134, and may specifically include a Filter (Filter) for filtering out ambient light penetrating through the finger, a light guiding layer or a light path guiding structure for guiding reflected light reflected from the surface of the finger to the sensing array 133 for optical detection, and other optical elements.

In particular implementations, the optical assembly 132 may be packaged with the same optical fingerprint component as the light detection portion 134. For example, the optical component 132 may be packaged in the same optical fingerprint chip as the optical detection portion 134, or the optical component 132 may be disposed outside the chip where the optical detection portion 134 is located, for example, the optical component 132 is attached to the chip, or some components of the optical component 132 are integrated into the chip.

For example, the light guide layer may specifically be a Collimator (collimater) layer manufactured on a semiconductor silicon wafer, and the collimater unit may specifically be a small hole, and in reflected light reflected from a finger, light perpendicularly incident to the collimater unit may pass through and be received by an optical sensing unit below the collimater unit, and light with an excessively large incident angle is attenuated by multiple reflections inside the collimater unit, so that each optical sensing unit can basically only receive reflected light reflected from a fingerprint pattern directly above the optical sensing unit, and the sensing array 133 can detect a fingerprint image of the finger.

In another embodiment, the light guide layer or the light path guiding structure may also be an optical Lens (Lens) layer, which has one or more Lens units, such as a Lens group composed of one or more aspheric lenses, and is used for converging the reflected light reflected from the finger to the sensing array 133 of the light detecting portion 134 therebelow, so that the sensing array 133 may perform imaging based on the reflected light, thereby obtaining the fingerprint image of the finger. Optionally, the optical lens layer may further form a pinhole in an optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to enlarge a field of view of the optical fingerprint module 130, so as to improve a fingerprint imaging effect of the optical fingerprint module 130.

In other embodiments, the light guide layer or the light path guiding structure may also specifically adopt a Micro-Lens (Micro-Lens) layer, the Micro-Lens layer has a Micro-Lens array formed by a plurality of Micro-lenses, which may be formed above the sensing array 133 of the light detecting portion 134 through a semiconductor growth process or other processes, and each Micro-Lens may respectively correspond to one of the sensing units of the sensing array 133. And other optical film layers, such as a dielectric layer or a passivation layer, can be formed between the microlens layer and the sensing unit. More specifically, a light blocking layer (or referred to as a light blocking layer) having micro holes may be further included between the microlens layer and the sensing unit, wherein the micro holes are formed between the corresponding microlenses and the sensing unit, and the light blocking layer may block optical interference between adjacent microlenses and the sensing unit, and enable light corresponding to the sensing unit to be converged into the micro holes through the microlenses and transmitted to the sensing unit through the micro holes for optical fingerprint imaging.

It should be understood that several implementations of the light guiding layer or the light path guiding structure described above may be used alone or in combination. For example, a microlens layer may be further disposed above or 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.

As an alternative embodiment, the display screen 120 may adopt a display screen having a self-Light Emitting display unit, such as an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. Taking an OLED display screen as an example, the optical fingerprint module 130 may use a display unit (i.e., an OLED light source) of the OLED display screen 120 located in the fingerprint detection area 121 as an excitation light source for optical fingerprint detection. When the finger 140 is pressed against the fingerprint detection area 121, the display 120 emits a beam of light 111 towards the target finger 140 above the fingerprint detection area 121, and the light 111 is reflected at the surface of the finger 140 to form reflected light or scattered light by the inside of the finger 140. In the related patent application, the above-mentioned reflected light and scattered light are collectively referred to as reflected light for convenience of description. Because the ridges (ridges) 141 and the valleys (valley)142 of the fingerprint have different light reflection capabilities, the reflected light 151 from the ridges and the reflected light 152 from the valleys of the fingerprint have different light intensities, and after passing through the optical assembly 132, the reflected light is received by the sensing array 133 in the optical fingerprint module 130 and converted into corresponding electrical signals, i.e., fingerprint detection signals; based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, so that an optical fingerprint identification function is realized in the terminal device 10.

In other embodiments, the optical fingerprint module 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 module 130 may be suitable for a non-self-luminous display screen, such as a liquid crystal display screen or other passive luminous display screen. Taking an application to a liquid crystal display screen having a backlight module and a liquid crystal panel as an example, to support the underscreen fingerprint detection of the liquid crystal display screen, the optical fingerprint system of the terminal device 10 may further include an excitation light source for optical fingerprint detection, where the excitation light source may specifically be an infrared light source or a light source of non-visible light with a specific wavelength, and may be disposed below the backlight module of the liquid crystal display screen or in an edge area below a protective cover plate of the terminal device 10, and the optical fingerprint module 130 may be disposed below the edge area of the liquid crystal panel or the protective cover plate and guided through a light path so that the fingerprint detection light may reach the optical fingerprint module 130; alternatively, the optical fingerprint module 130 may be disposed below the backlight module, and the backlight module may open holes or perform other optical designs on film layers such as a diffusion sheet, a brightness enhancement sheet, and a reflection sheet to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint module 130. When the optical fingerprint module 130 is used to provide an optical signal for fingerprint detection by using an internal light source or an external light source, the detection principle is consistent with the above description.

It should be understood that in a specific implementation, the terminal device 10 further includes a transparent protective cover plate, which may be a glass cover plate or a sapphire cover plate, positioned above the display screen 120 and covering the front surface of the terminal device 10. Therefore, in the embodiment of the present application, the pressing of the finger on the display screen 120 actually means pressing on the cover plate above the display screen 120 or the surface of the protective layer covering the cover plate.

On the other hand, in some embodiments, the optical fingerprint module 130 may only include one optical fingerprint sensor, and the area of the fingerprint detection area 121 of the optical fingerprint module 130 is small and the position is fixed, so that the user needs to press the finger to a specific position of the fingerprint detection area 121 when performing fingerprint input, otherwise the optical fingerprint module 130 may not collect a fingerprint image and cause poor user experience. In other alternative embodiments, the optical fingerprint module 130 may specifically include a plurality of optical fingerprint sensors. A plurality of optics fingerprint sensor can set up side by side through the concatenation mode the below of display screen 120, just a plurality of optics fingerprint sensor's response area constitutes jointly optics fingerprint module 130's fingerprint detection area 121. That is to say, the fingerprint detection area 121 of optics fingerprint module 130 can include a plurality of subregions, and every subregion corresponds to one of them optics fingerprint sensor's induction zone respectively, thereby will the fingerprint detection area 121 of optics fingerprint module 130 can extend to the main area of the lower half of display screen, extend to the finger and press the region promptly usually, thereby realize blind formula fingerprint input operation. Alternatively, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 121 may also be extended to half or even the entire display area, thereby enabling half-screen or full-screen fingerprint detection.

In this embodiment, the display screen 120 may be a flexible display screen, or a foldable display screen. For example, the display screen 120 may be made of a flexible material such as plastic or metal.

The display screen 120 shown in fig. 1 is a flip-out foldable display screen, and the display area of the display screen 120 is outside the display screen 120. However, the present embodiment is also applicable to the flip-in foldable display screen, and the display area of the display screen 120 may be on the inner side of the display screen 120.

When the display screen 120 is a flexible display screen, the transparent protective cover plate above the display screen 120 may be a flexible cover plate for protecting the display screen 120. The material of the flexible cover plate may be, for example, a flexible material such as a Polyimide Film (PI). The flexible apron can't provide the supporting role for display screen 120, and under this condition, when the user pressed display screen 120, because display screen 120's material is comparatively soft, display screen 120 can take place to warp in pressing the regional part, not only influences user experience, but also can influence the fingerprint identification performance of optics fingerprint module, probably causes the damage of flexible display screen 120 and optics fingerprint module even.

In view of this, the embodiment of the present application provides a fingerprint identification device, which can implement the under-screen fingerprint identification of a flexible display screen.

Fig. 3 is a schematic diagram of an apparatus 300 for fingerprint identification according to an embodiment of the present application. The fingerprint recognition apparatus 300 is applied to an electronic device having a flexible display screen 310. Wherein, the fingerprint recognition device 300 includes a supporting structure 320 and an optical fingerprint module 330.

The support structure 320 is configured to be at least partially disposed in the light-transmissive region under the flexible display 310, and the support structure 320 is configured to support the flexible display 310.

Optical fingerprint module 330 is used for setting up on bearing structure 320, optical fingerprint module 330 is used for gathering via the finger reflection or the scattering of flexible display screen 310 top and from the light signal that light transmission region transmitted comes.

The light-transmitting area may be understood as an area for transmitting an optical signal for fingerprint recognition, i.e., an area through which light passes during fingerprint recognition.

Because set up bearing structure 320 between flexible display screen 310 and optics fingerprint module 330, when carrying out fingerprint identification, the part of flexible display screen 310 in the finger pressing area can not take place serious deformation because of bearing structure 320's support to user experience has been promoted, the influence to the fingerprint identification performance of optics fingerprint module 330 has been avoided.

The flexible display screen 310 may be, for example, a flexible LCD display screen or a flexible OLED display screen. The light emitting layer of the flexible OLED display may include a plurality of organic light emitting diode light sources, and the optical fingerprint module 330 may use at least a portion of the organic light emitting diode light sources as an excitation light source for fingerprint identification.

The flexible display 310 may correspond to the display 120 shown in fig. 1 and 2. For example, the flexible display 310 may include at least one of: the display comprises a flexible cover plate glass, a touch control layer, a polaroid, an OLED light emitting layer, a foam layer, a display shading and heat dissipation buffer layer, a metal layer, various glue layers such as OCA or PET and the like. For the related description, reference may be made to the foregoing description on the display screen 120, and for brevity, the description is omitted here.

Optical fingerprint module 330 may correspond to optical fingerprint module 130 in fig. 1 and 2. Optical fingerprint module 330 can include optical component and optical fingerprint sensor. Wherein, this optical assembly is used for leading this light signal to this optics fingerprint sensor, and this optics fingerprint sensor is used for acquireing the fingerprint information of this finger according to this light signal of gathering.

The optical component includes optical elements such as an optical filter and an optical path modulator. The optical path modulator may be composed of an array of collimating holes, or at least one lens, or a micro-lens array, for example. In addition, the optical fingerprint module 330 may further include a flexible circuit board.

The fingerprint detection area of the optical fingerprint module 330 is at least partially located in the display area of the flexible display screen 310, and the lower portion of the fingerprint detection area is a light transmission area which is used for light transmission. Wherein, the light signal reflected or scattered by the finger on the fingerprint detection area reaches the optical fingerprint module 330 through the transparent area. The optical fingerprint module 330 performs fingerprint identification according to the collected optical signal. The support structure 320 may be particularly configured to support a portion of the flexible display 310 within the fingerprint detection area to prevent sagging of the portion of the flexible display 310 within the fingerprint detection area. Alternatively, the support structure 320 is used to support the portion of the flexible display screen 310 that is located above the light-transmissive region.

For reference to the foregoing description of the optical fingerprint module 130 in fig. 1 and 2, the related description of the optical fingerprint module 330 will not be repeated herein for brevity.

The optical fingerprint module 330 may be adhered to the lower surface of the supporting structure 320 by a material such as glue, an adhesive film, etc., for example, the optical fingerprint module 330 includes an optical path modulator composed of an array of collimating holes; optical fingerprint module 330 also can fix the lower surface at bearing structure 320 through the fingerprint module support, for example optical fingerprint module 330 includes the light path modulator of constituteing by lens or microlens. In addition, the optical fingerprint module 330 may be fixed on the supporting structure 320 by other methods, for example, mechanical fixing such as screw fixing, which is not limited in this application.

Alternatively, the optical fingerprint module 330 may be fixed on the middle frame. For example, the edge of the optical fingerprint module 330 is adhered to the lower surface of the middle frame, or the optical fingerprint module 330 is adhered to the lower surface of the middle frame through the circuit board thereof, or the edge of the light-transmitting window of the middle frame 340 is provided with a step and the optical fingerprint module 330 is fixed on the step structure of the lower surface of the middle frame.

Generally, the bezel 340 of the electronic device may be used to support the flexible display screen 310 as well as to secure other components. The middle frame 340 has a light-transmitting window located below the fingerprint detection area, so that the light signal reflected or scattered by the finger above the fingerprint detection area can be transmitted to the optical fingerprint module 330 through the light-transmitting window.

Since various holes, grooves, etc. for fixing other structures and components are further provided on the middle frame 340, the middle frame 340 cannot provide the whole screen support for the flexible display screen 310.

At this time, a metal sheet 370, for example, a steel sheet, may be disposed between the middle frame 340 and the flexible display 310 of the electronic device. Wherein, be provided with light transmission window on the sheet metal 370, this light transmission window is located the below of fingerprint detection area for the light signal of the finger reflection or scattering of transmission fingerprint detection area top, thereby make this light signal can reach optics fingerprint module 330.

Accordingly, the support structure 320 may be used to support portions of the flexible display 310 within the fingerprint detection area, while the metal sheet 370 may be used to support portions of the flexible display 310 outside the fingerprint detection area, thereby enabling full screen support of the flexible display 310.

The thickness of the metal sheet 370 is not limited in the embodiments of the present application, and may be, for example, 0 to 300 micrometers, or 50 to 200 micrometers.

The metal sheet 370 may be fabricated with the flexible display 310 as part of the flexible display 310; it may also be fabricated with the middle frame 340 so as to be installed between the flexible display 310 and the middle frame 340 as a part of the middle frame 340, or as a separate component from the flexible display 310 and the middle frame 340.

Assuming that the fingerprint recognition device 300 is not provided with the supporting structure 320, for example, as shown in fig. 4, fig. 4 shows the flexible display screen 310, the optical fingerprint module 330 and the middle frame 340. The foam layer 311 of the flexible display screen 310 is connected with the middle frame 340 through the foam layer 341. Optical fingerprint module 330 is connected through bubble cotton layer 331 between 340. Wherein, the foam layer 341 and the foam layer 331 can be replaced by other adhesive materials such as glue film and glue.

The foam layer in the embodiment of the application can be considered to comprise foam and back glue on the upper surface and the lower surface of the foam, so that the foam layer can also be called as foam glue, and the foam layer can play roles in bonding, buffering and the like.

The light-transmitting window of the foam layer 311 and the light-transmitting window of the middle frame 340 shown in fig. 4 form the light-transmitting region for transmitting the optical signal described above. The optical fingerprint module 330 is located under the transparent region. The light signal of finger reflection or scattering on the fingerprint detection area 312 is transmitted to the optical fingerprint module 330 through this light-transmitting area, and the optical fingerprint module 330 carries out fingerprint identification according to this light signal of gathering.

Due to the softness of the material of the flexible display 310, a distinct stepped region is formed at the fingerprint detection area 312 within the flexible display 310. This poor region of section has not only reduced user experience, may cause the damage to flexible display screen 310 because the finger presses moreover to fingerprint identification performance to optical fingerprint module 330 causes the influence.

In order to support the flexible display screen 310, in the embodiment of the present application, a support structure 320 is disposed in the light-transmitting area below the flexible display screen 310, and is used for supporting the step difference area.

The support structure 320 should have a certain stiffness. Meanwhile, the supporting structure 320 should be capable of transmitting an optical signal, so that the optical signal reflected or scattered by the finger can be transmitted to the optical fingerprint module 330.

Accordingly, the support structure 320 may be transparent, for example, the support structure 320 may be made of a transparent material such as optical glass or optical resin. Alternatively, a plurality of through holes may be disposed on the supporting structure 320, and the plurality of through holes are used for transmitting optical signals.

Alternatively, the flexible display screen 310 and the support structure 320 may be snug; alternatively, it is preferred that there is a spacer layer 350 between the flexible display 310 and the support structure 320.

For example, the spacer layer 350 may be an air spacer layer, i.e., there is an air gap between the flexible display 310 and the support structure 320.

For another example, the spacer layer 350 may be a foam layer or a metal layer, and at least one through hole is disposed on the spacer layer 350, so that the optical signal is transmitted through the at least one through hole. The through holes for transmitting optical signals are arranged on the foam layer or the metal layer.

When there is a small distance between the flexible display screen 310 and the supporting structure 320, the interference fringes caused by the deformation of the flexible display screen 310 may affect the fingerprint recognition performance of the optical fingerprint module 330, which is also commonly referred to as "water ripple". When the distance between the flexible display screen 310 and the supporting structure 320 is too large, the finger pressing may damage the flexible display screen 310. Therefore, the spacer layer 350 between the flexible display 310 and the support structure 320 should have a suitable thickness.

The thickness of the spacer layer 350 is not limited in the embodiment of the present application, and may be, for example, 100-150 μm.

Because optics fingerprint module 330 is fixed on bearing structure 320, consequently can be through adjusting bearing structure 320 the mounted position on vertical direction, indirectly adjust the size of spacing layer 350 between optics fingerprint module 330 and flexible display screen 310 to when avoiding flexible display screen 310 to warp the produced interference fringe, reduce flexible display screen 310's deformation space.

Optionally, the apparatus 300 for fingerprint recognition further comprises a buffer layer 360. Wherein the buffer layer 360 is for being disposed between the display panel 310 and the support structure 320.

For example, the buffer layer 360 may be fixed on the lower surface of the flexible display 310, such as by being adhered to the lower surface of the flexible display 310 by a glue layer.

At this time, the spacer layer 350 is positioned between the buffer layer 360 and the support structure 320.

As another example, the cushioning layer 360 is secured to the upper surface of the support structure 320, such as by a layer of adhesive.

At this time, the spacer layer 350 is positioned between the buffer layer 360 and the flexible display 310.

For another example, two buffer layers 360 may be provided, wherein one buffer layer 360 is fixed on the upper surface of the support structure 320 and the other buffer layer 360 is fixed on the lower surface of the flexible display screen 310.

At this time, the spacer layer 350 is positioned between the two buffer layers 360.

The Adhesive layer may be, for example, Optically Clear Adhesive (OCA), transparent glue, transparent Adhesive film, or the like.

For another example, the upper surface of the buffer layer 360 is attached to the lower surface of the flexible display panel 310, and the lower surface of the buffer layer 360 is attached to the upper surface of the supporting structure 320, such as the upper surface of the protruding portion of the boss structure.

At this point, there is no spacer layer 350 between the flexible display 310 and the support structure 320. Since the flexible display 310 and the support structure 320 are closely attached to the buffer layer 360 therebetween, there is no small distance and no interference fringes are generally generated.

The hardness of the buffer layer 360 should be in a suitable range to buffer the pressing force of the fingers on the flexible display 310, so the buffer layer 360 may be made of a transparent soft film material such as plastic, silicone, or adhesive film, for example, polyurethane (TPU), Polyimide (PI), or Polyester (PET).

At this time, the buffer layer 360 may not only buffer the pressing force of the finger on the flexible display 310, but also indirectly adjust the size of the gap 350 between the support structure 320 and the flexible display 310 by adjusting the thickness of the buffer layer 360. Also, the buffer layer 330 fixed to the lower surface of the flexible display 310 reinforces the flexible display 310 to some extent.

The buffer layer 360 may be one or more layers of transparent film.

That is, the buffer layer 360 may be a single material layer; or a composite material layer, that is, a plurality of material layers, for example, the buffer layer 360 sequentially includes an OCA glue layer, a PET layer, and an OCA glue layer from top to bottom.

The present implementation provides two implementations of the support structure 320.

In one implementation, the support structure 320 is a boss structure.

Optionally, the raised portion of the boss structure is located in the light transmissive region below the flexible display screen 310.

Further, optionally, the protrusion is located below the foam layer 311 of the flexible display screen 310. For example, the edge of the protrusion is connected to the foam layer 311 by a bonding material such as foam or glue layer.

Optionally, the non-convex portion of the boss structure is located outside the light-transmitting region below the flexible display screen 310.

Further, optionally, the non-raised portion is located below the middle frame 340, or below the metal sheet 370. For example, the upper surface of the non-protruding portion is adhered to the lower surface of the middle frame 340 or the metal sheet 370 by a glue layer.

The adhesive layer may be foam, OCA, glue, or glue film, for example.

It can be understood that the convex portion of the convex structure extends into the light-transmitting region under the flexible display screen 310, for example, is connected to the lower surface of the foam layer 311 of the flexible display screen; while the non-raised portions of the raised boss structure are located outside the light-transmitting region, for example, in connection with the lower surface of the center frame 340 or the metal sheet 370.

In this embodiment, since the transparent region is required to be disposed below the fingerprint detection region 312 in the flexible display screen 310 so as to transmit the optical signal for fingerprint identification, the supporting structure 320 is filled in the transparent region to support the portion of the flexible display screen 310 in the fingerprint detection region 312, so that when a finger presses the fingerprint detection region 312 for fingerprint identification, the flexible display screen 310 does not deform significantly.

The support structure 320 in this implementation is described below in conjunction with fig. 5-9.

Fig. 5 shows a flexible display screen 310, a support structure 320, a cushioning layer 360, a metal sheet 370, a bezel 340, and an optical fingerprint module 330. The buffer layer 360 is a transparent flexible film material and is fixed on the lower surface of the flexible display screen 310. A metal sheet 370 is adhered under the foam layer 311 of the flexible display 310. The metal sheet 370 and the middle frame 340 are connected through foam 341, wherein the foam 341 plays a role of connection and buffering, and can be replaced by glue, glue film or other adhesive materials.

The supporting structure 320 is a protruding structure, the protruding portion of the protruding structure is upward, the protruding portion extends into the light-transmitting region below the flexible display screen 310, and the non-protruding portion of the protruding structure is located outside the light-transmitting region. Specifically, the protruding portion of the protruding structure is located below the foam layer 311, and the edge of the protruding portion is fixed to the edge of the light-transmitting window of the foam layer 311 through the foam 321, wherein the foam layer 311 is a foam layer carried by the flexible display screen 310. The non-protruding portion of the protruding structure is located below the middle frame 340, and the non-protruding portion is fixed to the edge of the light-transmitting window of the middle frame 340 through a glue layer 321, wherein the glue layer 321 may be a glue film or a glue or other adhesive material.

The boss structure is snapped into the light transmissive region under the flexible display screen 310. And a spacer layer 350 is present between the upper surface of the boss structure and the buffer layer 360. Wherein, can be through the thickness of the adjustment glue film 321 and/or buffer layer 360, adjust the thickness of spacer layer 350 indirectly to find the best image forming position of optics fingerprint module 330, make the optics fingerprint module 330 of fixing at the boss structure lower surface reach the best fingerprint identification effect.

Moreover, since the vertical position of the boss structure can be adjusted by adjusting the thickness of the adhesive layer 321, processing and mounting errors of the respective laminated layers, such as the middle frame 340, the metal sheet 370, and the like, can be absorbed.

In addition, as can be seen from fig. 5, the supporting structure 320 decouples the optical fingerprint module 330 from the flexible display screen 310, and the optical fingerprint module 330 can be replaced and maintained without damaging the flexible display screen 310.

Fig. 6 illustrates the components of the fingerprint recognition device in fig. 5, wherein an adhesive is applied to an open area of the lower surface of the flexible display 310, which is formed by the foam layer 311 and the light-transmitting window of the metal sheet 370, etc. attached to the flexible display 310, and the adhesive is used for adhering the buffer layer 360. The buffer layer 360 is attached to the area inside the opening by the adhesive. The middle frame 340 is fixed on the lower surface of the flexible display screen 310, and the position of the light-transmitting window of the middle frame 340 is the same as the position of the opening area of the lower surface of the flexible display screen 310. The transparent boss structure 320 snaps into the light transmissive window of the center frame 340. Optical fingerprint module 330 is fixed at the lower surface of center.

Fig. 7 shows a flexible display screen 310, a support structure 320, a metal sheet 370, a middle frame 340, and an optical fingerprint module 330. In contrast to fig. 5 and 6, the buffer layer 360 is not provided in fig. 7. Wherein, a metal sheet 370 is adhered below the foam layer 311 of the flexible display screen 310. The metal sheet 370 and the middle frame 340 are connected through foam 341, wherein the foam 341 plays a role of connection and buffering, and can be replaced by glue, glue film or other adhesive materials.

The support structure 320 is a boss structure. The convex portion of the boss structure is upward, the convex portion extends into the light-transmitting region below the flexible display screen 310, and the non-convex portion of the boss structure is located outside the light-transmitting region. Specifically, the edge of the convex portion of the boss structure is connected to the lower surface of the flexible display screen 310 through the foam 321, wherein the foam 321 plays a role of connection and buffering. The non-protruding portion of the protruding structure is located below the middle frame 340, and the non-protruding portion is fixed to the edge of the light-transmitting window of the middle frame 340 through a glue layer 321, wherein the glue layer 321 may be a glue film or a glue or other adhesive material.

The boss structure is snapped into the light transmissive region under the flexible display screen 310. And a spacer layer 350 is present between the upper surface of the protruding portion of the boss structure and the flexible display screen 310. Wherein, can be through the thickness of adjustment glue film 321, adjust the thickness of spacer layer 350 indirectly to find the best image forming position of optics fingerprint module 330, make the optics fingerprint module 330 of fixing at the boss structure lower surface reach the best fingerprint identification effect.

In addition, as can be seen from fig. 7, the supporting structure 320 decouples the optical fingerprint module 330 from the flexible display screen 310, and the optical fingerprint module 330 can be replaced and maintained without damaging the flexible display screen 310.

The spacer layer 350 shown in fig. 5 and 7 is an air spacer layer. However, the embodiments of the present application are not limited thereto, and the spacer layer 350 capable of realizing optical signal transmission should fall within the scope of the present application.

For example, spacer layer 350 in FIG. 6 may be replaced with spacer layer 350 shown in FIG. 8 (a). In fig. 8(a), the supporting structure 320 is a boss structure, and the protruding portion is upward. The spacer layer 350 above the mesa structure is provided with a plurality of through holes that may be used to transmit optical signals. Therefore, the spacing layer 350 can not only enable the optical fingerprint module 330 and the flexible display screen 310 to be kept at a proper distance to meet the imaging requirement of the optical fingerprint module 330, but also ensure that the optical signals reflected or scattered by the fingers above the flexible display screen 310 can be smoothly transmitted to the optical fingerprint module 330 through the through holes.

The shape and position of the through holes on the spacer layer 350 are not limited in the embodiments of the present application, for example, in the top view of the spacer layer 350 shown in fig. 8(b) and 8(c), taking 4 through holes as an example, the 4 through holes may be arranged side by side, or may be uniformly arranged in two perpendicular directions.

When the spacer layer 350 adopts such a design, it is particularly suitable for the situation that the optical fingerprint module 330 adopts the splicing of multiple optical fingerprint sensors. Because during the concatenation of a plurality of optical fingerprint sensor, the area in the fingerprint detection area of optical fingerprint module 330 can grow, and the horizontal area in the printing opacity region of flexible display screen 310 below also can grow. Support for the flexible display 310 in the area of the large area fingerprint collection may be achieved by the non-through hole area of the spacer layer 350.

For example, replacing the spacer 350 shown in fig. 5 with a spacer 350 with a through hole results in a fingerprint recognition device as shown in fig. 9.

Further, the buffer layer 360 shown in fig. 9 may be removed, thereby obtaining the fingerprint recognition apparatus shown in fig. 10.

For the detailed description of each component in fig. 9 and fig. 10, reference may be made to the related description for fig. 5, and for brevity, the detailed description is not repeated here.

The boss structure can be a single body, for example, the boss structure is made of a transparent material by integral molding; the boss structure may also be an assembly, i.e. the boss structure is formed from a combination of different materials, e.g. the boss and non-boss of the boss structure may be made of different materials.

When the boss structure is formed by combining different materials, optionally, the protruding portion of the boss structure is formed by cured glue, and the non-protruding portion of the boss structure is a transparent flat plate adhered below the protruding portion.

For example, the protrusion is formed by filling the glue before curing inside the light-transmitting window of the metal sheet 370 and curing.

The glue may be, for example, a curable glue, such as a thermosetting glue or an Ultraviolet (UV) curable glue, etc.

The transparent plate may be made of, for example, transparent glass or transparent resin.

Such a boss structure formed of a different material composition as described above may be fabricated, for example, by the method shown in fig. 11.

Fig. 11 is a schematic flow chart of a method for manufacturing a support structure, wherein the support structure is the above-mentioned boss structure. As shown in fig. 11, the method 1100 includes:

in 1110, the metal sheet 370 is horizontally placed on one side of the auxiliary flat plate 380, wherein the auxiliary flat plate 380 covers the light-transmitting window of the metal sheet 370.

At 1120, a liquid glue 322 is poured into the portion of the auxiliary plate 380 that is located within the light-transmissive window.

In 1130, the transparent plate 323 is covered onto the light transmission window from the other side of the auxiliary plate 380 so that the glue 322 in a liquid state fills the light transmission window.

In 1140, the glue 322 in liquid state is cured to obtain the mesa structure.

The convex part of the boss structure is cured glue 322, and the non-convex part of the boss structure is a transparent flat plate 323.

The following is a detailed description taking fig. 12 and 13 as an example.

Fig. 12 shows a top view of the metal sheet 370. A light-transmitting window is arranged on the metal sheet, is positioned in the light-transmitting area below the flexible display screen 310, and is used for transmitting an optical signal for fingerprint identification. The light-transmitting window can be in any shape, wherein the light-transmitting window of the metal sheet is square in fig. 12 as an example.

Fig. 13 shows a metal sheet 370, an auxiliary plate 380, glue 322 in a current liquid state, and a transparent plate 323. The glue 322 is used to form the convex portion of the convex structure, and the transparent plate 323 is used as the non-convex portion of the convex structure. The auxiliary plate 380 may be, for example, a non-adhesive plate or film, such as a silicone-loaded glass plate.

First, the auxiliary flat plate 380 is placed on one side of the metal sheet 370, and covers the light-transmitting window of the metal sheet 370.

Next, glue is dispensed in the light-transmitting window of the metal sheet 370, i.e., the glue 322 is dispensed on the auxiliary plate 380 at the position in the light-transmitting window. The glue 322 is dispensed in an amount such that the glue 322 at least fills the light-transmitting window.

Finally, a transparent flat plate 323 is overlaid on the light transmissive window from the other side of the metal sheet 370, such that the glue 322 naturally fills the inside of the light transmissive window of the metal sheet 370 and the gap between the metal sheet 370 and the transparent flat plate 323.

The glue 322 is cured and the auxiliary plate 380 is removed, resulting in the boss structure being embedded in the light transmissive window of the metal sheet 370, as shown in fig. 14, for example. Wherein the glue between the transparent plate 323 and the metal sheet 370 is thin, not shown here.

It will be appreciated that in order to more conveniently form the boss structure, the auxiliary plate 380 shown in fig. 13 is generally placed at the lowermost layer, the metal sheet 370 is placed above the auxiliary plate 380, the glue 322 is poured into the window area formed by the auxiliary plate 380 and the metal sheet 370 from above, and the transparent plate 323 is overlaid on the light-transmitting window of the metal sheet 370 from above to below so that the glue 322 fills the light-transmitting window.

In addition, the connection between the transparent flat plate 323 and the protruding portion, i.e., the cured glue 322, may also be achieved by a transparent glue or a transparent adhesive film, such as OCA.

The thickness of the raised portion of the boss structure is the same as the thickness of the metal sheet 370.

Optionally, the upper surface of the raised portion of the boss structure is the same height as the upper surface of the metal sheet 370.

Optionally, the protrusions and the upper surface of the metal sheet 370 are covered with an overflow glue layer 3221 formed by the glue 322 before curing overflowing the light transmissive window of the metal sheet 370.

The overflow glue layer 3221 has a small thickness, which may be on the order of microns. That is, a small amount of flash may be received on the raised portion of the boss structure, i.e., the upper surface of cured glue 322, and the upper surface of metal sheet 370. Thereby ensuring that there is no level difference between the overflow glue layer 3221 and the metal sheet 370. The overfill glue layer 3221 is not shown in fig. 14 due to the smaller thickness.

As shown in fig. 15, the spill glue layer 3221 may be irregularly shaped.

It can be understood that the overflow glue layer 3221 realizes a transition from the upper surface of the convex portion of the boss structure to the upper surface of the metal sheet 370, so that a step difference between the boss structure and the metal sheet 370 can be further eliminated, thereby improving user experience and protecting the flexible display screen 310.

In addition, the step difference between the overflow glue layer 3221 and the metal sheet 370 may also be reduced or eliminated by grinding and polishing, for example, and is not limited herein.

Fig. 16 and 17 show a fingerprint recognition apparatus to which the boss structure is applied, based on the boss structure of fig. 12 to 15.

As shown in fig. 16, there is shown a flexible display screen 310, a support structure 320, a metal sheet 370 and an optical fingerprint module 330. The lower surface of the flexible display panel 310 is provided with a transparent film 313, and the transparent film 313 may be an OCA glue layer, or a composite layer such as a composite layer of an OCA glue layer, a PET layer, and an OCA glue layer. The metal sheet 370 is fixed to the lower surface of the transparent film 313. The support structure 320 comprises a raised portion, i.e. cured glue 322, embedded in the light transmissive window of the metal sheet 370, and a non-raised portion, i.e. a transparent plate 323, located below the metal sheet 370. Optical fingerprint module 330 pastes the lower surface at transparent flat plate 323.

As also shown in fig. 17, there is shown a flexible display screen 310, a support structure 320, a buffer layer 360, a metal sheet 370, and an optical fingerprint module 330. Wherein, the lower surface of the flexible display screen 310 is provided with a foam layer 311, and the metal sheet 370 is fixed on the lower surface of the foam layer 311. The support structure 320 comprises a raised portion, i.e. cured glue 322, embedded in the light transmissive window of the metal sheet 370, and a non-raised portion, i.e. a transparent plate 323, located below the metal sheet 370. The upper surface of the buffer layer 360 is adhered to the lower surface of the flexible display screen 310, and the lower surface is adhered to the upper surface of the boss portion of the boss structure. Optical fingerprint module 330 pastes the lower surface at transparent flat plate 323.

The detailed description of the boss structure in fig. 16 and 17 can refer to the description of fig. 12 to 15, and the description is omitted here for brevity.

In another implementation of the supporting structure 320, a plurality of through holes are disposed on the supporting structure 320, and the through holes are used for transmitting optical signals.

For example, the support structure 320 may be a support layer provided with a plurality of through holes, such as a foam layer or a metal layer provided with a plurality of through holes.

As shown in fig. 18, there is shown a flexible display screen 310, a support structure 320, a cushioning layer 360, a metal sheet 370, a center frame 340, and an optical fingerprint module 330. A metal sheet 370 is adhered under the foam layer 311 of the flexible display 310. The metal sheet 370 and the middle frame 340 are connected through foam 341, wherein the foam 341 plays a role of connection and buffering, and can be replaced by glue, glue film or other adhesive materials. The buffer layer 360 is a transparent flexible film material and is fixed on the lower surface of the flexible display screen 310. Support structure 320 is secured to a lower surface of buffer layer 360.

The support structure 320 is a support layer provided with a plurality of through holes for transmitting light signals reflected from a finger above the flexible display screen 310. The support structure 320 is located in a light-transmissive region under the flexible display screen 310, specifically, within a light-transmissive window of the center frame 340. The optical fingerprint module 330 is fixed on the lower surface of the supporting structure 320.

Of course, the support structure 320 shown in fig. 18 may also be replaced by a layer of transparent material to allow transmission of real image optical signals without having to perforate the support structure 320.

In the embodiment of the application, the supporting structure 320 is arranged in the light transmission area below the flexible display screen 310, so that the supporting structure 320 can provide a supporting effect for the flexible display screen 310, deformation caused by pressing the flexible display screen with a finger in a fingerprint identification process is reduced, and damage to the flexible display screen is avoided. And, because optics fingerprint module 330 sets up on bearing structure 320, consequently can adjust the distance between optics fingerprint module 330 and the flexible display screen 310 through bearing structure 320 in a flexible way, improve fingerprint identification's performance. In addition, because decoupling has been gone between optical fingerprint module 330 and the flexible display screen 310, the dismantlement and the installation of the optical fingerprint module 330 of being convenient for are favorable to optical fingerprint module 330's maintenance.

In the embodiment of the present application, each of the adhesive materials located in the light-transmitting area should be a transparent adhesive material so as not to affect transmission of the optical signal, for example, the buffer layer 360 may be adhered to the lower surface of the flexible display screen 310 by OCA adhesive; and each pasting material on the non-optical path may be preferably other non-light-transmitting pasting material so as to achieve absorption of stray light, for example, the upper surface of the non-protruding part of the boss structure 320 is pasted on the surface of the middle frame 340 through foam, glue or glue film. Not all of the adhesive material is shown in fig. 4 to 18.

The embodiment of the application also provides electronic equipment, which comprises a flexible display screen and the fingerprint identification device in the various embodiments of the application.

Optionally, the electronic device further comprises a middle frame.

Optionally, a metal sheet is disposed between the flexible display screen and the middle frame.

By way of example and not limitation, the electronic device in the embodiments of the present application may be a portable or mobile computing device such as a terminal device, a mobile phone, a tablet computer, a notebook computer, a desktop computer, a game device, an in-vehicle electronic device, or a wearable smart device, and other electronic devices such as an electronic database, an automobile, and an Automated Teller Machine (ATM). This wearable smart machine includes that the function is complete, the size is big, can not rely on the smart mobile phone to realize complete or partial function, for example: smart watches or smart glasses and the like, and only focus on a certain type of application function, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets for physical sign monitoring, smart jewelry and other devices.

It should be noted that, without conflict, the embodiments and/or technical features in the embodiments described in the present application may be arbitrarily combined with each other, and the technical solutions obtained after the combination also fall within the protection scope of the present application.

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, and that various modifications and variations can be made by those skilled in the art based on the above embodiments and fall within the scope of the present application.

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

Claims

1. The fingerprint identification device is applied to an electronic device with a folding display screen to realize optical fingerprint detection under the screen, and comprises:

the boss structure comprises a boss part and a non-boss part positioned below the boss part, and the boss part is arranged on a middle frame of the folding display screen or a light-transmitting window of a metal sheet so as to support the folding display screen when a user presses fingers through the folding display screen;

the optical fingerprint module is arranged below the non-protruding part and comprises an induction array and a light path guide structure, the light path guide structure is used for guiding fingerprint detection light to the induction array, and the induction array is used for receiving the fingerprint detection light and detecting a fingerprint image of the finger according to the fingerprint detection light; wherein, fingerprint detection light is in the finger of folding display screen top forms and passes folding display screen and boss structure transmission extremely the light signal of optics fingerprint module.

2. The fingerprint recognition device of claim 1, wherein the non-raised portion of the raised structure is larger in size than the raised portion to form an extension relative to the raised portion, an upper surface of the extension being attached to a lower surface of an edge region of the light transmissive window of the center frame or a lower surface of an edge region of the light transmissive window of the metal sheet.

3. The fingerprint recognition device of claim 2, wherein the raised portions and the non-raised portions of the raised boss structure are integrally formed transparent structures.

4. The fingerprint recognition device according to claim 2, wherein the non-protruding portion of the protruding structure is a transparent plate, and the protruding portion is a glue layer formed after glue filled inside the light-transmitting window of the metal sheet is cured.

5. The fingerprint recognition device of claim 4, wherein the raised portions of the raised structures and the upper surface of the metal sheet are covered with an overflow glue layer formed by the glue overflowing the light-transmissive window of the metal sheet before curing.

6. The fingerprint identification device according to claim 1, wherein a foam layer is formed on the lower surface of the foldable display screen, a light-transmitting window is formed on the foam layer in the area where the optical fingerprint module is located, and the protruding portion of the boss structure is attached to the lower surface of the edge area of the light-transmitting window of the foam layer.

7. The fingerprint recognition device of claim 1, further comprising a spacer layer disposed between the folded display screen and the raised portion of the ledge structure, wherein the spacer layer is a transparent layer or a non-transparent layer having at least one through hole for transmitting fingerprint detection light passing through the folded display screen to the ledge structure and the optical fingerprint module.

8. The fingerprint recognition device according to claim 1, wherein the protruding structure is a non-transparent protruding structure, and the transparent protruding structure has a plurality of through holes for transmitting the fingerprint detection light passing through the foldable display to the optical fingerprint module.

9. The fingerprint recognition device according to claim 1, further comprising a buffer layer disposed between the foldable display screen and the boss structure for buffering direct contact of the foldable display screen with the boss structure when the foldable display screen is pressed by a finger.

10. The fingerprint recognition device according to claim 9, wherein the buffer layer is attached to a lower surface of the foldable display screen or an upper surface of the protruding portion of the boss structure.

11. The fingerprint recognition device of claim 10, further comprising a spacer layer disposed between the cushioning layer and the raised portion of the plateau structure.

12. The fingerprint recognition apparatus according to claim 1, wherein the optical path guiding structure comprises:

the optical collimator layer is provided with a plurality of collimating units which respectively correspond to the optical sensing units of the sensing array, wherein each collimating unit is respectively used for collimating and guiding the fingerprint detection light above to the corresponding optical sensing unit and attenuating the light rays with the collimation angle inconsistent with that of the collimating unit; or,

the optical lens layer is provided with one or more lens units and is used for converging the fingerprint detection light formed by the finger to an induction array below the optical lens layer so that the induction array can image based on the fingerprint detection light to obtain the fingerprint image, and the optical lens layer is provided with a pinhole on the optical path of the lens units and used for matching with the optical lens layer to form the fingerprint detection light on the induction array with an expanded visual field angle; or,

the micro-lens layer is provided with a plurality of micro-lenses which are manufactured above the induction array through a semiconductor growth process, and each micro-lens corresponds to one optical induction unit of the induction array; the light blocking layer is formed between the microlens layer and the sensing array and is provided with micropores formed between the microlenses and the optical sensing units, and the light blocking layer is used for blocking optical interference between adjacent microlenses and the optical sensing units and enabling the fingerprint detection light to be converged into the micropores through the microlenses and transmitted to the corresponding optical sensing units through the micropores to obtain the fingerprint image.

13. The fingerprint recognition device according to claim 1, wherein the metal sheet is disposed between the foldable display screen and the middle frame, and has a predetermined thickness range such that the metal sheet is folded along with the bending region when the foldable display screen is folded while supporting the foldable display screen, and returns to an original form along with the bending region when the foldable display screen is unfolded.

14. The fingerprint recognition device of claim 13, wherein the metal sheet has a thickness of between 50 and 200 microns.

15. An electronic device, characterized in that the electronic device comprises a folding display screen and the fingerprint recognition device according to any one of claims 1 to 14, wherein the fingerprint recognition device is disposed below the folding display screen to realize the optical fingerprint detection under the screen, and the folding display screen is an OLED display screen, and a part of the OLED display units of the OLED display screen is used as an excitation light source for fingerprint detection when the fingerprint recognition device performs fingerprint detection.