CN110770750B

CN110770750B - Fingerprint identification device and electronic equipment

Info

Publication number: CN110770750B
Application number: CN201980002783.8A
Authority: CN
Inventors: 侯志明
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2019-04-18
Filing date: 2019-04-18
Publication date: 2023-09-12
Anticipated expiration: 2039-04-18
Also published as: CN110770750A; CN210142333U; WO2020211062A1; CN214225933U

Abstract

A fingerprint identification device and electronic equipment are applied to the electronic equipment with a flexible display screen, and can realize the under-screen fingerprint identification of the flexible display screen. The device comprises: the support piece is used for being arranged below the flexible display screen and used for supporting the flexible display screen; a first buffer layer, configured to be disposed between the flexible display screen and the support, where a gap exists between the first buffer layer and the flexible display screen, or the gap exists between the first buffer layer and the support; the optical fingerprint module is used for being arranged below the supporting piece and used for collecting optical signals returned by reflection or scattering of fingers above the flexible display screen.

Description

Fingerprint identification device and electronic equipment

Technical Field

The embodiment of the application relates to the field of biological feature recognition, and more particularly relates to a fingerprint recognition device and electronic equipment.

Background

The technology for identifying the fingerprints under the optical screen is that the optical fingerprint module collects reflected light formed by the reflection of light rays emitted by the light source on the fingers, and fingerprint information of the fingers is carried in the reflected light, so that the fingerprint identification under the screen is realized. For the foldable mobile phone and the like adopting the flexible display screen, when the finger presses the flexible display screen to carry out fingerprint identification, the material of the fingerprint identification display screen is soft, so that the depression can occur in the pressing area of the finger, the user experience is influenced, the fingerprint identification performance of the optical fingerprint module is also influenced, and even the flexible display screen and the optical fingerprint module can be damaged.

Disclosure of Invention

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

In a first aspect, a fingerprint recognition device is provided, for application to an electronic apparatus having a flexible display screen, the device comprising:

the support piece is used for being arranged below the flexible display screen and used for supporting the flexible display screen;

a first buffer layer, configured to be disposed between the flexible display screen and the support, where a gap exists between the first buffer layer and the flexible display screen, or the gap exists between the first buffer layer and the support;

the optical fingerprint module is used for being arranged below the supporting piece and used for collecting optical signals returned by reflection or scattering of fingers above the flexible display screen.

In one possible implementation, the hardness of the first buffer layer is between the hardness of the flexible display screen and the hardness of the support.

In one possible implementation, the first buffer layer is adhered to the upper surface of the support member through a transparent adhesive layer.

In one possible implementation manner, the first buffer layer is adhered to the lower surface of the flexible display screen through a transparent adhesive layer.

In one possible implementation, the area of the transparent glue layer is greater than or equal to the area of the first buffer layer.

In one possible implementation, the foam layer of the flexible display screen is located below the first buffer layer, and an edge of the first buffer layer is overlapped with an edge of the light-transmitting window of the foam layer.

In one possible implementation, the apparatus further includes:

and the second buffer layer is arranged between the supporting piece and the first buffer layer, and the gap exists between the second buffer layer and the first buffer layer.

In one possible implementation, the material of the first buffer layer is TPU, PI or PET.

In one possible implementation, the second buffer layer is a transparent layer.

In one possible implementation, the second buffer layer is adhered to the upper surface of the support member through a transparent adhesive layer.

In one possible implementation manner, a metal sheet is disposed between the middle frame of the electronic device and the flexible display screen, and the second buffer layer is located in a light-transmitting window of the metal sheet.

In one possible implementation, the hardness of the second buffer layer is between the hardness of the flexible display screen and the hardness of the support.

In one possible implementation, the second buffer layer is a composite layer.

In one possible implementation, the material of the transparent glue layer is OCA glue or transparent glue.

In one possible implementation, the first buffer layer is a composite layer.

In one possible implementation, the middle frame is fixed to a lower surface of the support.

In one possible implementation, the support is located within a light-transmitting window of the middle frame.

In one possible implementation, the upper surface of the middle frame and the upper surface of the support are the same height.

In one possible implementation, the edge of the support is fixed to the lower surface of the foam layer of the flexible display screen.

In one possible implementation, the edge of the support is fixed to the middle frame.

In one possible implementation, the middle frame is fixed on the lower surface of the foam layer.

In one possible implementation, the first buffer layer is located within a light-transmitting window of the foam layer.

In one possible implementation, a metal sheet is disposed between the middle frame of the electronic device and the flexible display screen, and the support is located within a light-transmitting window of the metal sheet.

In one possible implementation, the height of the upper surface of the metal sheet and the upper surface of the support is the same.

In one possible implementation, the edge of the support is fixed to the metal sheet.

In one possible implementation, the metal sheet is fixed to the lower surface of the foam layer.

In one possible implementation, the middle frame is fixed to the lower surface of the metal sheet.

In one possible implementation, the optical fingerprint module is fixed on the support.

In one possible implementation, the optical fingerprint module is adhered to the lower surface of the support member.

In one possible implementation, the optical fingerprint module is fixed to the lower surface of the support member by a fingerprint module holder.

In one possible implementation, the optical fingerprint module is fixed on the middle frame.

In one possible implementation manner, the optical fingerprint module is adhered to the lower surface of the middle frame of the electronic device.

In one possible implementation, the optical fingerprint module is fixed on the lower surface of the middle frame through a fingerprint module bracket.

In one possible implementation manner, a step structure is arranged on one side, close to the lower surface, of the light-transmitting window of the middle frame, and the edge of the optical fingerprint module is fixed on the step structure.

In one possible implementation, the flexible display screen includes a bending region and a non-bending region, and the device is disposed below the non-bending region of the flexible display screen.

In one possible implementation, the optical fingerprint module includes an optical component for guiding the optical signal to the optical fingerprint sensor, and an optical fingerprint sensor for acquiring fingerprint information of the finger from the optical signal.

In one possible implementation, the optical assembly includes an optical path modulation unit consisting of an array of collimation holes.

In one possible implementation, the optical assembly includes an optical path modulation unit composed of at least one lens.

In one possible implementation, the material of the support is optical glass or resin.

In one possible implementation, the support and the first buffer layer are transparent layers.

In a second aspect, there is provided an apparatus for fingerprint recognition, for use in an electronic device having a flexible display screen, the apparatus comprising:

the first buffer layer is used for being arranged below the flexible display screen, wherein the middle frame of the electronic equipment is arranged below the first buffer layer;

a support member for being disposed below the first buffer layer, the support member for supporting the flexible display screen;

In one possible implementation, the support member is adhered to the lower surface of the first buffer layer through a transparent adhesive layer.

In one possible implementation, the middle frame is fixed on the lower surface of the first buffer layer.

In one possible implementation, the metal sheet is fixed to a lower surface of the first buffer layer.

In one possible implementation manner, the middle frame is adhered to the lower surface of the first buffer layer through a transparent adhesive layer.

In one possible implementation, the first buffer layer is a composite layer.

In a third aspect, there is provided a terminal device comprising:

a flexible display screen; the method comprises the steps of,

the apparatus of the first aspect or of any possible implementation of the first aspect, or

The apparatus of the second aspect or any possible implementation of the second aspect.

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

Based on the technical scheme, through setting up the buffer layer in the below of flexible display screen to and set up support piece in the below of buffer layer for support piece can provide the supporting role for flexible display screen. And because the buffer layer exists, the support piece is not in direct contact with the flexible display screen, so that the damage to the flexible display screen is avoided. In addition, the first buffer layer can be used for adjusting the gap between the support piece and the flexible display screen, and the proper gap can prevent water ripple generated when the flexible display screen is deformed and reduce the deformation space of the flexible display screen after being pressed.

Drawings

Fig. 1 is a schematic diagram of an electronic device to which the present application can be applied.

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

Fig. 3 is a schematic block diagram of an apparatus 300 for fingerprint identification in accordance with an embodiment of the present application.

Fig. 4 is a schematic view of the support having an area equal to the fingerprint detection area.

Fig. 5 is a schematic view of the support having an area larger than the fingerprint detection area.

Fig. 6 is a schematic diagram of one possible configuration of the apparatus 300 shown in fig. 3.

Fig. 7 is a schematic diagram of one possible configuration of the apparatus 300 shown in fig. 3.

Fig. 8 (a) is a schematic diagram of one possible configuration of the device 300 shown in fig. 3.

Fig. 8 (b) is a schematic diagram of one possible configuration of the device 300 shown in fig. 3.

Fig. 9 is a schematic diagram of one possible configuration of the apparatus 300 shown in fig. 3.

Fig. 10 is a schematic diagram of one possible configuration of the apparatus 300 shown in fig. 3.

Fig. 11 is a schematic diagram of one possible configuration of the apparatus 300 shown in fig. 3.

Fig. 12 is a schematic diagram of one possible configuration of the apparatus 300 shown in fig. 3.

Fig. 13 is a schematic diagram of one possible configuration of the apparatus 300 shown in fig. 3.

Fig. 14 is a schematic diagram of one possible configuration of the apparatus 300 shown in fig. 3.

Fig. 15 is a schematic diagram of one possible configuration of the apparatus 300 shown in fig. 3.

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 may 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 in terms of optical fingerprint systems, but should not be construed as limiting the embodiments of the present application in any way, and the embodiments of the present application are equally applicable to other systems employing optical imaging techniques, 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 above terminal device, the optical fingerprint module may be specifically an optical fingerprint module, which may be disposed in a partial area or an entire area Under the display screen, thereby forming an Under-screen (Under-display or Under-screen) optical fingerprint system. Alternatively, the optical fingerprint module may be partially or fully integrated into the display screen of the terminal device, so as to form an In-screen (In-display or In-screen) optical fingerprint system.

Fig. 1 and 2 show schematic diagrams 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-A'.

The terminal device 10 includes a display 120 and an optical fingerprint module 130. 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 area of the sensing array 133 or the sensing area thereof is the fingerprint detection area 121 (may also be referred to as a fingerprint detection area 121, 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 further disposed at other locations, such as a side of the display screen 120 or an edge non-transparent area of the terminal device 10, and the optical signal from at least a portion of the display area of the display screen 120 is guided to the optical fingerprint module 130 through an optical path design, so that the fingerprint detection area 121 is actually located in the display area of the display screen 120.

It should be appreciated 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, by a light path design such as lens imaging, a reflective folded light path design, or other light path designs such as light converging or reflecting, the area of the fingerprint detection area 121 of the optical fingerprint module 130 may be made larger than the area of the sensing array 133 of the optical fingerprint module 130. In other alternative implementations, if the light path is guided, for example, by 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 the terminal device or perform other fingerprint verification, the user only needs to press the finger against the fingerprint detection area 121 located on the display screen 120, so as to implement fingerprint input. Since fingerprint detection can be implemented in the screen, the terminal device 10 adopting the above structure does not need to have a special reserved space on the front surface to set fingerprint keys (such as Home keys), so that a comprehensive screen scheme can be adopted, that is, the display area of the display screen 120 can be basically expanded 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 detecting portion 134 and an optical component 132. The light detecting part 134 includes the sensing array 133 and a reading circuit and other auxiliary circuits electrically connected to the sensing array 133, which may be fabricated on a chip (Die) such as an optical imaging chip or an optical fingerprint sensor by a semiconductor process. The sensing array 133 is specifically a Photo detector (Photo detector) array, which includes a plurality of Photo detectors distributed in an array, which may be used as an optical sensing unit as described above. The optical component 132 may be disposed above the sensing array 133 of the light detecting portion 134, and may specifically include a Filter layer (Filter), a light guiding layer or a light path guiding structure, and other optical elements, where the Filter layer may be used to Filter out ambient light penetrating the finger, and the light guiding layer or the light path guiding structure is mainly used to guide reflected light reflected from the finger surface to the sensing array 133 for optical detection.

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

The light guiding layer or the light path guiding structure of the optical component 132 may have various implementations, for example, the light guiding layer may be a Collimator (Collimator) layer made of a semiconductor silicon wafer, which has a plurality of collimating units or a micropore array, the collimating units may be small holes, the light vertically incident to the collimating units from the reflected light reflected by the finger may pass through and be received by the optical sensing units below the collimating units, and the light with an excessively large incident angle is attenuated by multiple reflections inside the collimating units, so each optical sensing unit basically only receives the reflected light reflected by the fingerprint lines right above the optical sensing units, and the sensing array 133 may detect the fingerprint image of the finger.

In another embodiment, the light guiding 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 consisting of one or more aspheric lenses, for converging the reflected light reflected from the finger to the sensing array 133 of the light detecting part 134 thereunder, so that the sensing array 133 may image based on the reflected light, thereby obtaining a fingerprint image of the finger. Optionally, the optical lens layer may further form a pinhole in the optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to expand the field of view of the optical fingerprint module 130, so as to improve the fingerprint imaging effect of the optical fingerprint module 130.

In other embodiments, the light guiding layer or the light path guiding structure may also specifically employ a Micro-Lens layer having a Micro Lens array formed of a plurality of Micro lenses, which may be formed over the sensing array 133 of the light sensing part 134 by a semiconductor growth process or other processes, and each Micro Lens may correspond to one of sensing units of the sensing array 133, respectively. 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 micro lens layer and the sensing unit, wherein the micro holes are formed between their corresponding micro lenses and the sensing unit, and the light blocking layer may block optical interference between adjacent micro lenses and the sensing unit, and allow light corresponding to the sensing unit to be converged into the micro holes through the micro lenses and transmitted to the sensing unit via the micro holes for optical fingerprint imaging.

It should be appreciated that several implementations of the light guiding layer or light path guiding structure described above may be used alone or in combination. For example, a microlens layer may be further provided 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 laminated structure or the optical path thereof may need to be adjusted according to actual needs.

As an alternative embodiment, the display 120 may be a display having a self-luminous display unit, such as an Organic Light-Emitting Diode (OLED) display or a Micro-LED (Micro-LED) display. Taking an OLED display as an example, the optical fingerprint module 130 may use a display unit (i.e., an OLED light source) of the OLED display 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 light 111 to the target finger 140 above the fingerprint detection area 121, and the light 111 is reflected on the surface of the finger 140 to form reflected light or scattered light scattered inside the finger 140, and in the related patent application, the reflected light and the scattered light are collectively referred to as reflected light for convenience of description. Since the ridge (ridge) 141 and the valley (valley) 142 of the fingerprint have different light reflection capacities, the reflected light 151 from the ridge and the reflected light 152 from the valley have different light intensities, and 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 after passing through the optical component 132; fingerprint image data can be obtained based on the fingerprint detection signal, and fingerprint matching verification can be further performed, thereby realizing an optical fingerprint recognition function at 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 adapted to a non-self-luminous display screen, such as a liquid crystal display screen or other passive light emitting display screen. Taking the application to a liquid crystal display having a backlight module and a liquid crystal panel as an example, in order to support the under-screen fingerprint detection of the liquid crystal display, 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 be specifically an infrared light source or a light source of non-visible light with a specific wavelength, which may be disposed below the backlight module of the liquid crystal display or an edge region below a protective cover plate of the terminal device 10, and the optical fingerprint module 130 may be disposed below the edge region of the liquid crystal panel or the protective cover plate and guided by an optical path so that 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 be configured to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint module 130 by making holes or other optical designs on the film layers such as the diffusion sheet, the brightness enhancement sheet, and the reflection sheet. When the optical fingerprint module 130 is used to provide an optical signal for fingerprint detection using an internal light source or an external light source, the detection principle is consistent with the above description.

It should be appreciated 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, that is positioned over the display screen 120 and covers the front side of the terminal device 10. Thus, in the embodiment of the present application, the pressing of the finger against the display screen 120 actually means pressing 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 include only one optical fingerprint sensor, where the area of the fingerprint detection area 121 of the optical fingerprint module 130 is smaller 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 inputting the fingerprint, otherwise, the optical fingerprint module 130 may not be able to collect the fingerprint image, resulting in poor user experience. In other alternative embodiments, the optical fingerprint module 130 may specifically include a plurality of optical fingerprint sensors. The optical fingerprint sensors may be disposed side by side below the display screen 120 in a spliced manner, and the sensing areas of the optical fingerprint sensors together form a fingerprint detection area 121 of the optical fingerprint module 130. That is, the fingerprint detection area 121 of the optical fingerprint module 130 may include a plurality of sub-areas, each corresponding to a sensing area of one of the optical fingerprint sensors, so that the fingerprint detection area 121 of the optical fingerprint module 130 may be extended to a main area of the lower half of the display screen, that is, to a finger usual pressing area, thereby implementing a blind press type 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 whole display area, thereby achieving half-screen or full-screen fingerprint detection.

In the embodiment of the present application, the display 120 is a flexible display, or referred to as a folding display. For example, the display 120 may be made of a flexible material such as plastic or metal.

The display 120 shown in fig. 1 is an out-turned folded display, and the display area of the display 120 is outside the display 120. Embodiments of the present application are also applicable to an inverted folded display where the display area of display 120 may be on the inside of display 120.

A flexible cover plate may be overlaid over the display screen 120 for protecting the display screen 120. The material of the flexible cover plate may be, for example, polyimide Film (PI) flexible resin or the like. In the following, the finger pressing flexible display screen refers to the finger pressing flexible display screen and the flexible cover plate covered on the upper surface of the finger pressing flexible display screen, and for brevity, the description is omitted.

Since the flexible cover plate does not provide support for the display 120. In this case, when the user presses the fingerprint detection area 121 on the display screen 120 to perform fingerprint identification, the material of the flexible display screen 120 is softer, so that the depression can be generated in the pressing area of the finger, which not only affects the user experience, but also may affect the fingerprint identification performance of the optical fingerprint module, and may even cause damage to the flexible display screen and the optical fingerprint module.

Therefore, the embodiment of the application provides a scheme for preventing the flexible display screen from sinking, which can prevent the flexible display screen from sinking caused by finger pressing in the fingerprint identification process.

Fig. 3 is a schematic diagram of a fingerprint recognition apparatus 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. The fingerprint identification device 300 includes a support 320, a first buffer layer 330, and an optical fingerprint module 340.

The support 320 is for being disposed under the flexible display screen 310, and the support 320 is for supporting the flexible display screen 310.

The first buffer layer 330 is for being disposed between the flexible display screen 310 and the supporter 320.

The optical fingerprint module 340 is configured to be disposed below the support 320, and the optical fingerprint module 340 is configured to collect an optical signal returned by reflection or scattering from a finger above the flexible display screen 310.

Because the support member 320 is disposed between the flexible display screen 310 and the optical fingerprint module 340, the finger pressing area on the flexible display screen 310 will not sag due to the support of the support member 320, thereby improving the user experience and avoiding the influence on the fingerprint recognition performance of the optical fingerprint module 340.

In addition, since the first buffer layer 330 is provided between the flexible display screen 310 and the supporter 320, the flexible display screen 310 is not in direct contact with the hard supporter 320, thereby avoiding damage to the flexible display screen 310.

Optionally, the flexible display 310 includes a bending region and a non-bending region, and the fingerprint recognition device 300 is configured to be disposed below the non-bending region of the flexible display.

The flexible display 310 may be, for example, a flexible LCD display or a flexible OLED display. The light-emitting layer of the flexible OLED display may include a plurality of organic light-emitting diode light sources, where the optical fingerprint module 340 may use at least a portion of the organic light-emitting diode light sources as excitation light sources for fingerprint recognition.

The flexible display screen 310 may correspond to the display screen 120 shown in fig. 1 and 2. The display screen 120 may include, for example, at least one of flexible cover glass, a touch control layer, a polarizer, an OLED light emitting layer, a foam layer, a display light shielding and heat dissipating buffer layer, various glue layers, and the like. For the relevant description, reference may be made to the foregoing description of the display 120, and for brevity, the description will not be repeated.

The optical fingerprint module 340 may correspond to the optical fingerprint module 130 of fig. 1 and 2. For example, the optical fingerprint module 340 may include an optical component and an optical fingerprint sensor. The optical component is used for guiding the optical signal to the optical fingerprint sensor, and the optical fingerprint sensor is used for acquiring fingerprint information of the finger according to the optical signal. The optical component comprises optical elements such as an optical filter, an optical path modulator and the like. The light path modulator may for example consist of an array of collimator holes, or of at least one lens, or of an array of micro lenses. In addition, the optical fingerprint module 340 may further include a flexible circuit board or the like. For brevity, reference may be made to the description of the optical fingerprint module 130 in fig. 1 and 2, and the description is omitted.

In the embodiment of the present application, the fingerprint detection area 121 of the optical fingerprint module 340 is at least partially located in the display area of the flexible display screen 310. The fingerprint detection area 121 may be located anywhere in the flexible display screen 310, such as at an edge or in the middle of the flexible display screen 310.

When fingerprint identification is performed, the light emitted by the light source irradiates the finger above the fingerprint detection area 121, and the light signal reflected by the finger reaches the optical fingerprint module 340. The optical signal carries fingerprint information of the finger, and the optical fingerprint module 340 performs fingerprint identification on the finger according to the collected optical signal.

The support 320 is disposed between the flexible display screen 310 and the fingerprint recognition module 320, and is used for supporting the flexible display screen 310. The support 320 can prevent a portion of the display screen within the finger-pressed area from sagging when the finger presses the fingerprint detection area 121 within the flexible display screen 310. In addition, since the first buffer layer 330 is disposed between the support 320 and the flexible display screen 310, direct collision between the flexible display screen 310 and the support 320 when a finger is pressed against the fingerprint detection area 121 can be avoided, and the flexible display screen 310 is further protected.

The support 320 and the first buffer layer 330 may be used to transmit optical signals so that optical signals reflected by a finger above the flexible display screen 310 can be transmitted to the optical fingerprint module 340. For example, the support 320 and the first buffer layer 330 may be transparent layers, or the support 320 and the first buffer layer 330 may have light-transmitting openings therein.

The support 320 should also have a certain stiffness to enable support of the flexible display screen 310.

For example, the supporter 320 may be made of a transparent material such as optical glass or optical resin.

While the hardness of the first buffer layer 330 should be in a suitable range to support the flexible display screen 310 and buffer the pressing force of the finger against the flexible display screen 310. For example, the hardness of the first buffer layer 330 may be between the hardness of the flexible display screen 310 and the hardness of the supporter 320.

For example, the first buffer layer 330 may be made of a transparent material such as polyurethane (Thermoplastic Polyurethanes, TPU), polyimide (PI), or polyester (Polyethylene Terephthalate, PET).

The first buffer layer 330 may also be a composite material layer, i.e., the first buffer layer 330 is composed of a plurality of material layers.

Optionally, a gap 360 exists between the first buffer layer 330 and the flexible display screen 310, or the gap 360 exists between the first buffer layer 330 and the support 320.

At this time, the first buffer layer 330 may not only play a role of buffering, but also serve to adjust the gap 360 between the supporter 320 and the flexible display screen 310. And, the flexible buffer layer 330 reinforces the flexible display screen 310 to some extent.

In general, when the distance between the flexible display screen 310 and the supporter 320 is too small, for example, several micrometers, the moire phenomenon caused by the interference of light is more remarkable. And when the distance between the flexible display screen 310 and the supporter 320 is too large, finger pressing may damage the flexible display screen 310. Accordingly, there should be a suitable gap 360 between the flexible display screen 310 and the support 320. The first buffer layer 330 is disposed between the flexible display screen 310 and the supporting member 320, and thus, the size of the gap 360 between the flexible display screen 310 and the supporting member 320 can be controlled by adjusting the thickness of the first buffer layer 330, thereby avoiding the moire phenomenon generated by the deformation of the flexible display screen 310 and reducing the deformation space of the flexible display screen 310.

The size of the gap 360 may be, for example, 0 mm to 0.3 mm. The size of the gap 360 may be determined according to the characteristics and the relative positional relationship of the flexible display screen and the supporter 320, and the size of the gap 360 is not limited herein.

The area of the support 320 may be equal to the area of the fingerprint detection area 121 or may be larger than the area of the fingerprint detection area 121, for example covering the non-bending area of the flexible display screen 310 where it is located, or even covering the whole flexible display screen 310.

For example, as shown in fig. 4, the support 320 may be located under the fingerprint detection area 121, and the area of the support 320 is approximately equal to the area of the fingerprint detection area 121.

As shown in fig. 5, for example, the area occupied by the support 320 is within the dashed box in fig. 5. It can be seen that the support 320 has an area greater than the area of the fingerprint detection area 121 and covers the non-bent area of the flexible display screen 310. At this time, the support 320 may support not only the portion of the flexible display screen 310 within the fingerprint detection area 121, but also the non-bent area of the flexible display screen 310.

Similarly, the area of the first buffer layer 330 may be equal to the area of the fingerprint detection area 121, or may be larger than the area of the fingerprint detection area 121, for example, covering the non-bending area of the flexible display screen 310 where it is located, or even covering the entire flexible display screen 310.

Also, the areas of the first buffer layer 330 and the supporter 320 may or may not be equal. The areas of the supporter 320 and the first buffer layer 330 are not limited herein.

Two ways for fixing the first buffer layer 330 provided in the embodiment of the present application are described below with reference to fig. 6 to 10.

Mode 1

The first buffer layer 330 is fixed to the upper surface of the supporter 320.

For example, the first buffer layer 330 is adhered to the upper surface of the support 320 through a transparent adhesive layer 331.

The transparent adhesive layer 331 may be, for example, an optically clear adhesive (Optically Clear Adhesive, OCA) or a transparent glue.

The OCA can be a double-sided adhesive tape without a base material, which is formed by making optical acrylic adhesive into a base material-free adhesive tape and then respectively attaching a layer of release film on the upper and lower bottom layers, namely the OCA can be a layer of base material-free double-sided adhesive tape with optical transparency.

The OCA may be any adhesive used for bonding transparent optical elements such as lenses, etc., as long as it has the characteristics of colorless transparency, light transmittance of more than a certain threshold value, for example, 90%, good bonding strength, curing at room temperature or medium temperature, small curing shrinkage, etc. For example, the OCA may be replaced with an optically transparent resin (Optical Clear Resin, OCR). By adopting the material with low curing shrinkage, the damage of molding shrinkage to the flexible display screen can be avoided.

Wrinkles caused by stresses to flexible display screen 310 during use may be avoided by controlling the modulus of the OCA and the hardness after curing.

Fig. 6 is a schematic diagram of a possible configuration of the fingerprint recognition device in the case of embodiment 1. Fig. 6 shows a flexible display screen 310, a first buffer layer 330, a support 320, an optical fingerprint module 340, and a middle frame 350. Fig. 6 also shows the foam layer 311 and the metal foil 312 of the flexible display screen 310, wherein the metal foil 312 is adhered to the lower surface of the flexible display screen 310 through the adhesive layer 313, and the foam layer 311 is adhered to the lower surface of the metal foil 312. The foam layer 311 in the embodiment of the present application may be considered as a glue layer including foam and upper and lower surfaces of the foam, i.e., foam glue. The middle frame 350 and the supporting member 320 are adhered to the lower surface of the foam layer 311, and the supporting member 320 is located in the light-transmitting window of the middle frame 350. The first buffer layer 330 is adhered to the upper surface of the supporter 320 through the transparent adhesive layer 331, and an air gap 360 exists between the first buffer layer 330 and the flexible display screen 310. The optical fingerprint module 340 is fixed on the lower surface of the support 320 through the fingerprint module holder 341.

In fig. 6, the first buffer layer 330 is fixed to the upper surface of the supporter 320, and a gap 360 exists between the first buffer layer and the flexible display screen 310. Thus, the support 320 can provide support for the flexible display screen 310 when fingerprinting is performed. And because of the existence of the first buffer layer 330, the support 320 is not in direct contact with the flexible display screen 310, so that damage to the flexible display screen 310 is avoided.

The air gap 360 between the first buffer layer 330 and the flexible display screen 310 can avoid the moire phenomenon caused by the deformation of the flexible display screen 310. And due to the existence of the first buffer layer 330, the gap 360 between the flexible display screen 310 and the support 320 is reduced, the deformation space of the flexible display screen 310 after being pressed is reduced, and the flexible display screen 310 is further protected.

Mode 2

The first buffer layer 330 is fixed to the lower surface of the flexible display screen 310.

For example, the first buffer layer 330 is adhered to the lower surface of the flexible display screen 310 through the transparent adhesive layer 331.

The transparent adhesive layer 331 may be, for example, OCA or transparent glue.

Optionally, the area of the transparent adhesive layer 331 is greater than or equal to the area of the first buffer layer 330.

Optionally, the foam layer 311 of the flexible display screen 310 is located below the first buffer layer 330, and the edge of the first buffer layer 330 is overlapped with the edge of the light-transmitting window of the foam layer 311.

Because the upper surface of the first buffer layer 330 is adhered to the lower surface of the flexible display screen 310, and the edge of the lower surface of the first buffer layer 330 is lapped and adhered to the upper surface edge of the light-transmitting window of the foam layer 311, the fixing strength of the first buffer layer 330 is improved, the edge of the first buffer layer 330 is not tilted when a finger presses the flexible display screen 310, the generation of bubbles is avoided, the fingerprint recognition performance is improved,

Fig. 7 is a schematic diagram of a possible configuration of the fingerprint recognition device in the case of embodiment 2. Fig. 7 shows a flexible display screen 310, a first buffer layer 330, a support 320, an optical fingerprint module 340, and a middle frame 350. Fig. 7 also shows the foam layer 311 and the metal foil 312 of the flexible display screen 310. The metal foil 312 and the first buffer layer 330 are adhered to the lower surface of the flexible display screen 310 through a transparent adhesive layer 331, and the first buffer layer 330 is located in the light-transmitting window of the metal foil 312. The foam layer 311 is adhered to the lower surface of the metal foil 312. The upper surface of the first buffer layer 330 is adhered to the lower surface of the flexible display screen 310 through the transparent adhesive layer 331, and the edge of the lower surface of the first buffer layer 330 is lapped on the edge of the upper surface of the foam layer 311. The middle frame 350 and the supporting member 320 are adhered to the lower surface of the foam layer 311, and the supporting member 320 is located in the light-transmitting window of the middle frame 350. An air gap 360 exists between the first buffer layer 330 and the supporter 320. The optical fingerprint module 340 is fixed on the lower surface of the support 320 through the fingerprint module 341.

In fig. 7, the first buffer layer 330 is adhered to the lower surface of the flexible display screen 310 by a large-area transparent adhesive layer 331, and a gap 360 exists between the first buffer layer and the supporter 320. Thus, the support 320 can provide support for the flexible display screen 310 when fingerprinting is performed. And because of the existence of the first buffer layer 330, the support 320 is not in direct contact with the flexible display screen 310, so that damage to the flexible display screen 310 is avoided.

The air gap 360 between the first buffer layer 330 and the supporter 320 can prevent the moire phenomenon caused by the deformation of the flexible display screen 310. And due to the existence of the first buffer layer 330, the gap 360 between the flexible display screen 310 and the support 320 is reduced, the deformation space of the flexible display screen 310 after being pressed is reduced, and the flexible display screen 310 is further protected.

Fig. 8 (a) and 8 (b) are schematic diagrams of another possible configuration of the fingerprint recognition device when the mode 2 is adopted. Fig. 8 shows a flexible display screen 310, a first buffer layer 330, a support 320, an optical fingerprint module 340, and a middle frame 350. Fig. 8 also shows the foam layer 311 and the metal foil 312 of the flexible display screen 310. The metal foil 312 is adhered to the lower surface of the flexible display screen 310 through an adhesive layer 313, and the foam layer 311 is adhered to the lower surface of the metal foil 312. The middle frame 350 and the supporting member 320 are adhered to the lower surface of the foam layer 311, and the supporting member 320 is located in the light-transmitting window of the middle frame 350. The first buffer layer 330 is adhered to the lower surface of the flexible display screen 310 through the transparent adhesive layer 331, and an air gap 360 exists between the first buffer layer 330 and the flexible display screen 310. The optical fingerprint module 340 is fixed on the lower surface of the support 320.

In fig. 8 (a) and 8 (b), the first buffer layer 330 is adhered to the lower surface of the flexible display screen 310 by a small-area transparent adhesive layer 331, and a gap 360 exists between the first buffer layer and the support 320. Thus, the support 320 can provide support for the flexible display screen 310 when fingerprinting is performed. And because of the existence of the first buffer layer 330, the support 320 is not in direct contact with the flexible display screen 310, so that damage to the flexible display screen 310 is avoided.

Fig. 8 (a) is different from fig. 8 (b) in that the optical fingerprint module 340 in fig. 8 (a) includes a lens for converging the optical signal reflected by the finger to the optical fingerprint sensor in the optical fingerprint module 340. Since the lens requires a certain imaging distance, the optical fingerprint module 340 may be fixed to the lower surface of the support 320 through the fingerprint module holder 341 to ensure a proper imaging distance. The optical fingerprint module 340 in fig. 8 (b) is an ultra-thin fingerprint module, and the optical fingerprint module 340 may include, for example, an array of collimating apertures for guiding the optical signals reflected by the finger to the optical fingerprint sensor. At this time, the optical fingerprint module 340 may be directly adhered to the lower surface of the support 320 through the adhesive layer 342.

The structure and type of the optical fingerprint module 340 are not limited in the present application. And the optical fingerprint module 340 may include one optical fingerprint sensor, or may include a plurality of optical fingerprint sensors spliced together.

In embodiments of the present application, one or more buffer layers may be provided between the support 320 and the flexible display screen 310. For example, the fingerprint recognition device 300 may further include a second buffer layer 370, the second buffer layer 370 being disposed between the support 320 and the first buffer layer 330, a gap 360 being present between the second buffer layer 370 and the first buffer layer 330.

When the first buffer layer 330 is adhered to the upper surface of the flexible display screen 310, the second buffer layer 370 is optionally adhered to the upper surface of the supporter 320 through the transparent adhesive layer 371.

The second buffer layer 370 may be used to transmit optical signals so that optical signals reflected by a finger above the flexible display screen 310 can be transmitted to the optical fingerprint module 340. For example, the second buffer layer 370 is a transparent layer, or the second buffer layer 370 has a light-transmitting opening thereon.

The hardness of the second buffer layer 370 should be in a suitable range and buffer the pressing force of the finger against the flexible display screen 310. For example, the hardness of the second buffer layer 370 may be between the hardness of the flexible display screen 310 and the hardness of the support 320.

For example, the second buffer layer 370 may be made of a transparent material such as TPU, PI, or PET.

The second buffer layer 370 may also be a composite material layer, i.e., the second buffer layer 370 is composed of a plurality of material layers.

Generally, the middle frame 350 of the electronic device may be used to support a display screen and other components fixed thereto, and the middle frame 350 has a light-transmitting window that is located below the fingerprint detection area 121, so that an optical signal reflected from a finger above the fingerprint detection area 121 can be transmitted to the optical fingerprint module 340 through the light-transmitting window.

Also, since the middle frame 350 is provided with various holes and grooves for fixing other structures and components, etc., the middle frame 350 cannot provide the whole screen support for the flexible display screen 310.

At this time, optionally, a metal sheet 380 may be disposed between the center 350 of the electronic device and the flexible display screen 310. The thickness of the metal sheet is not limited in the embodiments of the present application, and may be, for example, less than 300 micrometers, or 50-200 micrometers.

The metal sheet 380 has a light-transmitting window thereon, which is located below the fingerprint detection area 121 for transmitting an optical signal from the fingerprint detection area 121.

At this time, the second buffer layer 370 may be optionally located within the light-transmitting window of the metal sheet 380.

The thickness of the metal sheet 380 increases the gap between the flexible display screen 310 and the supporter 320, and thus, the gap due to the thickness of the metal sheet 380 can be adjusted by providing the second buffer layer 370, thereby reducing the deformation space of the flexible display screen 310 when being pressed. And the size of the gap 360 is controlled by adjusting the thickness of the second buffer layer 370, thereby avoiding the moire phenomenon generated by the deformation of the flexible display screen 310. In addition, the second buffer layer 370 may also be used to buffer the pressing force of the finger against the flexible display screen 310.

The metal sheet 380 may be considered as part of the middle frame 350, as part of the flexible display screen 310, or as a separate component from the middle frame 350 and the flexible display screen 310 disposed below the flexible display screen 310.

For example, as shown in fig. 9, the fingerprint recognition device 300 includes a flexible display screen 310, a first buffer layer 330, a second buffer layer 370, a support 320, an optical fingerprint module 340, a center 350, and a metal sheet 380. Wherein the metal sheet 380 is adhered to the lower surface of the flexible display screen 310 by an adhesive layer 381. The middle frame 350 and the supporting member 320 are adhered to the lower surface of the metal sheet 380 through the adhesive layer 382, and the supporting member 320 is located in the light-transmitting window of the middle frame 350. The first buffer layer 330 is adhered to the lower surface of the flexible display screen 310 through the transparent adhesive layer 331, the second buffer layer 370 is adhered to the upper surface of the support 320 through the transparent adhesive layer 371, and an air gap 360 exists between the first buffer layer 330 and the second buffer layer 370. The optical fingerprint module 340 is fixed on the lower surface of the support 320 through the fingerprint module holder 341.

In fig. 9, the first buffer layer 330 is fixed on the lower surface of the flexible display screen 310, and the second buffer layer 370 is fixed on the upper surface of the supporter 320, and a gap 360 exists between the first buffer layer 330 and the second buffer layer 370. Thus, the support 320 can provide support for the flexible display screen 310 when fingerprinting is performed. And due to the existence of the first buffer layer 330 and the second buffer layer 370, the support 320 is not in direct contact with the flexible display screen 310, so that damage to the flexible display screen 310 is avoided.

The gap 360 between the first buffer layer 330 and the second buffer layer 370 can avoid the moire phenomenon caused by the deformation of the flexible display screen 310. And the first buffer layer 330 and the second buffer layer 370 can reduce the gap 360 between the display screen 310 and the supporter 320, reduce the deformation space of the flexible display screen 310 after being pressed, and further protect the flexible display screen 310.

In an embodiment of the present application, the supporting member 320 may be disposed on the lower surface of the flexible display screen 310, for example, the edge of the supporting member 320 is adhered to the lower surface of the foam layer 311 of the flexible display screen 310, and when the supporting member 320 is adhered to the lower surface of the foam layer 311, at least part of the first buffer layer 330 and/or the second buffer layer 370 is located in the light-transmitting window of the foam layer 311; the support 320 may also be provided on the middle frame 350, for example, adhered to the middle frame 350, and for example, a stepped structure is provided at a side of the inner side of the light-transmitting window of the middle frame 350 near the upper surface and the support 320 is fixed to the stepped structure.

In the fingerprint recognition device shown in fig. 6 to 9, only the case where the supporter 320 is fixed to the lower surface of the foam layer 311 of the flexible display 310 is described, but the position of the supporter 320 is not limited in any way.

In the embodiment of the present application, the middle frame 350 may be disposed below the flexible display screen 310, for example, the middle frame 350 is adhered to the lower surface of the foam layer 311 of the flexible display screen 310, and when the middle frame 350 is adhered to the lower surface of the foam layer 311, the supporting member 320 may be located in the light-transmitting window of the middle frame 350; the middle frame 350 may also be disposed under the support member 320, for example, the middle frame 350 is adhered to the lower surface of the support member 320, and in this case, the support member 320 may cover the entire upper surface of the middle frame 350, for example; the middle frame 350 may also be disposed below the metal sheet 380, for example, the middle frame 350 is adhered to the lower surface of the metal sheet 380.

When a metal sheet 380 for supporting the flexible display screen 310 is disposed between the flexible display screen 310 and the middle frame 350, the supporter 320 may be positioned in a light-transmitting window of the metal sheet 380.

For example, as shown in fig. 10, the metal sheet 380 is increased or decreased in fig. 10 as compared with fig. 6. Fig. 10 shows a flexible display screen 310, a first buffer layer 330, a support 320, an optical fingerprint module 340, a metal sheet 380, and a middle frame 350. The first buffer layer 330 is adhered to the upper surface of the supporter 320 through the transparent adhesive layer 331, and an air gap 360 exists between the first buffer layer 330 and the flexible display screen 310. The metal sheet 380 is adhered to the lower surface of the foam layer 311, and the supporter 320 is located in the light-transmitting window of the metal sheet 380. The middle frame 350 is fixed to the lower surface of the metal sheet 380. The optical fingerprint module 340 is fixed on the lower surface of the support 320 through the fingerprint module holder 341.

In fig. 10, a support 320 is used to support the portion of the flexible display screen 310 within the fingerprint detection area, and a metal sheet 380 is used to support the portion of the flexible display screen 310 outside the fingerprint detection area. The support 320 and the metal sheet 380 may act as a cover glass on the non-flexible screen.

The supporting member 320 is disposed in the light-transmitting window of the metal sheet 380, so that the fingerprint recognition device 340 and the flexible display screen 310 are independent of each other, and replacement and maintenance of the fingerprint recognition module 340 are facilitated.

The positional relationship of the support 210, the metal sheet 380, and the middle frame 350, and the respective shapes are not limited in the embodiment of the present application. The support 320 may be disposed within the light-transmitting window of the metal sheet 380 or within the light-transmitting window of the middle frame 350; alternatively, the supporting member 320 may be located in the light-transmitting windows of the metal sheet 380 and the middle frame 350 at the same time, for example, as shown in fig. 11, the supporting member 320 is located in the light-transmitting windows of the metal sheet 380 and the middle frame 350, and the lower side of the supporting member 320 is manufactured with a step structure, so as to implement the cooperation of the metal sheet 380 and the middle frame 350 different from the light-transmitting windows.

In the fingerprint recognition device shown in fig. 6 to 11, the middle frame 350 or the metal sheet 380 is attached to the lower surface of the foam layer 311, but the positions of the middle frame 350 and the metal sheet 380 are not limited in any way.

It should be noted that when both the middle frame 350 and the supporter 320 are adhered to the lower surface of the foam layer 311, it is preferable that the height of the upper surface of the supporter 320 is the same as that of the upper surface of the middle frame 350, as shown in fig. 6 to 9, for example. The support 320 and the middle frame 350 have no level difference on the side close to the flexible display screen 310, i.e. are a plane, so that the flexible display screen 310 can be ensured not to generate appearance trace defects due to the existence of the support 320, and the phenomenon that the flexible display screen 310 generates 'bulges' due to the support 320 is avoided.

When both the metal sheet 380 and the supporter 320 are adhered to the lower surface of the foam layer 311, it is preferable that the upper surface of the supporter 320 has the same height as the upper surface of the metal sheet 380, as shown in fig. 10 and 11, for example. The support 320 and the metal sheet 380 have no level difference on the side near the flexible display screen 310, i.e., are a plane, so that the appearance trace defect of the flexible display screen 310 is avoided.

It should be understood that the support 320 is located in the light-transmitting window of the middle frame 350 in the embodiment of the present application, which means that the support 320 is partially or completely located in the light-transmitting window of the middle frame 350. The height of the supporter 320 is the same as the upper surface of the middle frame 350, but the heights of the supporter 320 and the lower surface of the middle frame 350 may be different.

Similarly, the support 320 being positioned within the light-transmitting window of the metal sheet 380 means that the support 320 is partially or completely positioned within the light-transmitting window of the metal sheet 380. The height of the support 320 is the same as the upper surface of the metal sheet 380, but the height of the support 320 may be different from the lower surface of the metal sheet 380.

In embodiments of the present application, the gap 360 may not exist between the support 320 and the flexible display screen 310. For example, the first buffer layer 330 is adhered to the lower surface of the flexible display screen 310, and the supporter 320 is adhered to the lower surface of the first buffer layer 330. Wherein the support 320 is used to support the flexible display screen 310, preventing the flexible display screen 310 from sagging due to finger pressing, and the first buffer layer 330 may prevent the flexible display screen 310 from being in direct contact with the support 320, thereby protecting the flexible display screen 310.

At this time, the middle frame 350 may be disposed under the first buffer layer 330 in addition to being disposed under the flexible display screen 310 or the supporter 320.

For example, the supporter 320 and the middle frame 350 are both disposed at the lower surface of the first buffer layer 310. Wherein the support 320 is partially or entirely located within the light-transmitting window of the middle frame 350.

Taking fig. 12 as an example, a flexible display screen 310, a first buffer layer 330, a support 320, an optical fingerprint module 340, and a middle frame 350 are shown. The first buffer layer 330 is adhered to the lower surface of the flexible display screen 310 through a transparent adhesive layer 331. The support 320 and the middle frame 350 are adhered to the lower surface of the first buffer layer 330 through the transparent adhesive layer 332, and the support 320 is located in the light-transmitting window of the middle frame 350. The optical fingerprint module 340 is fixed on the lower surface of the support 320 through the fingerprint module holder 341.

The support 320 can provide support for the flexible display screen 310 during fingerprinting. And due to the existence of the first buffer layer 330 and the second buffer layer 370, the support 320 is not in direct contact with the flexible display screen 310, so that damage to the flexible display screen 310 is avoided.

As also shown in fig. 13 and 14, a metal sheet 380 is disposed below the flexible display screen 310. The first buffer layer 330 is adhered to the lower surface of the flexible display screen 310 through a transparent adhesive layer 331. The supporter 320 and the middle frame 350 are adhered to the lower surface of the first buffer layer 330 through the transparent adhesive layer 332. The middle frame 350 is fixed to the lower surface of the metal sheet 380. The optical fingerprint module 340 is fixed on the lower surface of the support 320 through the fingerprint module holder 341. Wherein the support 320 is positioned within a light-transmitting window of the metal sheet 380, such as shown in fig. 13; alternatively, the support 320 may be located within a light-transmitting window of both the metal sheet 380 and the middle frame 350, such as shown in FIG. 14.

In fig. 13 and 14, the support 320 is used to support the portion of the flexible display screen 310 that is inside the fingerprint detection area, and the metal sheet 380 is used to support the portion of the flexible display screen 310 that is outside the fingerprint detection area. The support 320 and the metal sheet 380 may act as a cover glass on the non-flexible screen.

In an embodiment of the present application, the supporting member 320 may also be disposed under the flexible display screen 310 through the middle frame 350. For example, the edge of the supporter 320 is fixed to the middle frame 350.

Taking fig. 15 as an example, the middle frame 350 is adhered to the lower surface of the first buffer layer 330 by the adhesive layer 332, and the support 320 is disposed on the lower surface of the buffer layer 330 by the middle frame 350, wherein the support 320 is fixed on the step structure on the upper side of the light-transmitting window of the middle frame 350, and the above-mentioned gap may be disposed between the support 320 and the first buffer layer 330.

It should be understood that, in the embodiment of the present application, the first buffer layer 330 and the second buffer layer 370 may not be disposed between the support 320 and the flexible display screen 310, for example, the first buffer layer 330 and the transparent adhesive layer 331 are removed in fig. 10, and the support effect of the support 320 on the flexible display screen 310 may still be achieved. The various features of the embodiments of the present application are also applicable to this case.

Further protection of the flexible display screen 310 is achieved by the first buffer layer 330 and/or the second buffer layer 370 being able to avoid direct contact between the flexible display screen 310 and the support 320.

In the embodiment of the present application, when the first buffer layer 330 with a larger area is provided, the foam layer 331 may be omitted, and the foam layer is implemented by the first buffer layer 330. For example, the area of the first buffer layer 330 in fig. 10 covers the flexible display screen 310, and thus, the heat dissipation buffer and the like may be achieved by the first buffer layer 330 without providing the foam layer 331.

In an embodiment of the present application, the optical fingerprint module 340 may be fixed on the support 320. For example, the optical fingerprint module 340 is adhered to the lower surface of the support 320, and for example, the optical fingerprint module 340 is fixed to the lower surface of the support 320 by the fingerprint module holder 341.

The optical fingerprint module 340 may also be fixed on the middle frame 350. For example, the optical fingerprint module 340 is adhered to the lower surface of the middle frame 350, for example, the optical fingerprint module 340 is fixed to the lower surface of the middle frame 350 by the fingerprint module holder 341, for example, a step structure is disposed on a side, close to the lower surface, of the light-transmitting window of the middle frame 350, and an edge of the optical fingerprint module 340 is fixed to the step structure.

In the embodiment of the present application, each glue layer on the optical path of fingerprint identification should be a transparent glue layer so as not to affect the collection of the optical signals, for example, the glue layer 311 between the first buffer layer 330 and the flexible display screen 310 or the support 320, the glue layer 371 between the second buffer layer 370 and the support 320, and so on. The glue layers on the non-light path can be other non-light-transmitting glue layers, such as foam glue and the like. Not all glue layers are shown in the above figures.

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

Optionally, the electronic device further comprises a middle frame.

As an example and not by way of 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 intelligent device, and other electronic devices such as an electronic database, an automobile, and a bank automated teller machine (Automated Teller Machine, ATM). The wearable intelligent device comprises full functions, large size and complete or partial functions which can be realized independent of the intelligent mobile phone, for example: smart watches or smart glasses, etc., and are only focused on certain application functions, and need to be used in combination with other devices, such as smart phones, as well as devices for monitoring physical signs, such as smart bracelets, smart jewelry, etc.

It should be noted that, on the premise of no conflict, the embodiments and/or technical features in the embodiments described in the present application may be combined with each other arbitrarily, and the technical solutions obtained after combination should also fall into the protection scope of the present application.

It should be understood that the specific examples in the embodiments of the present application are intended to help those skilled in the art to better understand the embodiments of the present application, and not to limit the scope of the embodiments of the present application, and that those skilled in the art may make various modifications and variations on the basis of the above embodiments, and that these modifications or variations fall within the scope of the present application.

The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within 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. An apparatus for fingerprint identification adapted for use with an electronic device having a folded display screen to effect off-screen optical fingerprint detection, the apparatus comprising:

a transparent support member for being disposed below the non-bending region of the folding display screen and at least partially embedded in a light-transmitting window of a middle frame or a metal sheet of the electronic device to support the folding display screen when a user presses a finger through the folding display screen;

A transparent buffer layer, configured to be disposed between the folded display screen and the transparent support, to buffer direct contact of the folded display screen to the transparent support when the folded display screen is pressed by a finger, where a material of the transparent buffer layer includes at least one of TPU, PI, or PET;

the optical fingerprint module is arranged below the transparent support and comprises an induction array and an optical path guiding structure, wherein the optical path guiding 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; the fingerprint detection light is an optical signal which is formed by the fact that light rays emitted by a display unit of the folding display screen irradiate a finger above the folding display screen and passes through the folding display screen, the transparent support piece and the transparent buffer layer to be transmitted to the optical fingerprint module;

a preset gap is arranged between the transparent buffer layer and the folding display screen or between the transparent buffer layer and the transparent support piece, and the preset gap is used for limiting a deformation space when the folding display screen is pressed by the fingers and reducing the water ripple phenomenon generated by deformation.

2. The fingerprint recognition device according to claim 1, wherein the transparent buffer layer has a hardness between the hardness of the folded display screen and the hardness of the transparent support member, and is adhered to an upper surface of the transparent support member or a lower surface of the folded display screen through a transparent adhesive layer.

3. The fingerprint identification device according to claim 1, wherein a middle frame of the electronic equipment is used for supporting the folding display screen, a foam layer and a metal foil are formed on the lower surface of the folding display screen, a light-transmitting window is formed on the foam layer and the metal foil at the position of the optical fingerprint module, the transparent support piece is attached to the foam layer or the metal foil, and the transparent buffer layer is located on the light-transmitting window of the foam layer and/or the metal foil.

4. A fingerprint recognition device according to claim 3, wherein the transparent buffer layer is attached to the lower surface of the folded display screen; or, the transparent support piece is attached to the upper surface of the transparent support piece; or, the foam layer is provided with an extension part extending inwards relative to the metal foil at the light-transmitting window, and the transparent buffer layer is lapped on the extension part of the foam layer.

5. A device for fingerprint recognition according to claim 3, wherein the transparent buffer layer comprises a first buffer layer and a second buffer layer, wherein the first buffer layer is attached to the lower surface of the folded display screen, and the second buffer layer is attached to the upper surface of the transparent support.

6. The fingerprint recognition device according to claim 1, wherein an upper surface of the middle frame or the metal sheet is flush with an upper surface of the transparent support.

7. The fingerprint recognition device according to claim 6, wherein the metal sheet is disposed on an upper surface of the middle frame, and the light-transmitting window of the middle frame is smaller than the light-transmitting window of the metal sheet to form a supporting portion at an edge region of the light-transmitting window of the middle frame, and the transparent support is disposed on an upper surface of the supporting portion.

8. The fingerprint recognition device according to claim 5, wherein the metal sheet is disposed on an upper surface of the middle frame, and the light-transmitting window of the middle frame is larger than the light-transmitting window of the metal sheet, wherein the transparent support has an upper portion having a smaller width than a lower portion to form a transparent boss structure, wherein the upper portion of the transparent boss structure is matched with the light-transmitting window of the metal sheet, and the lower portion of the transparent boss structure is matched with the light-transmitting window of the middle frame.

9. The fingerprint recognition device according to claim 1, wherein the transparent window of the middle frame has an upper width smaller than a lower width to form a stepped structure, and the transparent support is disposed on a stepped surface of the stepped structure.

10. The fingerprint recognition device according to claim 1, wherein the transparent buffer layer has a size larger than that of the transparent window of the middle frame or the metal sheet, and is directly attached to the lower surface of the non-folded region of the folded display screen.

11. The fingerprint recognition device according to claim 1, wherein the metal sheet is disposed between the folding display screen and the center frame and supports a folded region and a non-folded region of the folding display screen, and has a predetermined thickness range such that it is folded with the folded region when the folding display screen is folded while supporting the folding display screen, and is restored to an original form with the folded region when the folding display screen is unfolded.

12. The fingerprint recognition device of claim 11, wherein the metal sheet has a thickness of less than 300 microns.

13. The fingerprint recognition device of claim 12, wherein the metal sheet has a thickness of between 50 microns and 200 microns.

14. The fingerprint recognition device 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 guiding the fingerprint detection light above to the corresponding optical sensing unit in a collimating way and attenuating the light which is inconsistent with the collimation angle of the collimating unit.

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

an optical lens layer having one or more lens units for converging fingerprint detection light formed at the finger to a sensing array therebelow such that the sensing array images based on the fingerprint detection light to obtain the fingerprint image, wherein the optical lens layer is formed with a pinhole in an optical path of the lens units for cooperating with the optical lens layer to image the fingerprint detection light at the sensing array with an enlarged field angle.

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

a microlens layer and a light blocking layer, the microlens layer having a plurality of microlenses fabricated over the sensing array by a semiconductor growth process, and each microlens corresponding to one of the optical sensing units of the sensing array, respectively; the light blocking layer is formed between the microlens layer and the sensing array and has micro holes formed between the microlenses and the optical sensing units, and the light blocking layer is used for blocking optical interference between adjacent microlenses and optical sensing units and enabling the fingerprint detection light to be converged into the micro holes through the microlenses and transmitted to the corresponding optical sensing units through the micro holes so as to obtain the fingerprint image.

17. An electronic device comprising a folded display screen and a fingerprint recognition device according to any one of claims 1 to 16, wherein the fingerprint recognition device is arranged below the folded display screen to enable an under-screen optical fingerprint detection, and the folded display screen is an OLED display screen, and a part of the OLED display unit of the OLED display screen is used as an excitation light source for fingerprint detection when the fingerprint recognition device performs fingerprint detection.