WO2020211062A1

WO2020211062A1 - Fingerprint recognition apparatus and electronic device

Info

Publication number: WO2020211062A1
Application number: PCT/CN2019/083322
Authority: WO
Inventors: 侯志明
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2019-04-18
Filing date: 2019-04-18
Publication date: 2020-10-22
Also published as: CN214225933U; CN110770750B; CN110770750A; CN210142333U

Abstract

Provided are a fingerprint recognition apparatus and an electronic device, the fingerprint recognition apparatus is applied to the electronic device with a flexible display screen, and can realize under-screen fingerprint recognition of the flexible display screen. The apparatus includes: a support member which is arranged under the flexible display screen, the support member is used to support the flexible display screen; a first buffer layer which is arranged between the flexible display screen and the support member, wherein, a gap is formed between the first buffer layer and the flexible display screen, or the gap is formed between the first buffer layer and the support member; and an optical fingerprint module which is arranged under the support member, the optical fingerprint module is used to collect optical signals returned by reflection or scattering of the finger above the flexible display screen.

Description

Fingerprint recognition device and electronic equipment

Technical field

The embodiments of the present application relate to the field of biometric identification, and more specifically, to a fingerprint identification device and electronic equipment.

Background technique

The fingerprint recognition technology under the optical screen is to collect the light emitted by the optical fingerprint module from the light source to reflect the reflected light on the finger, and the reflected light carries the fingerprint information of the finger, so as to realize the fingerprint recognition under the screen. For foldable mobile phones with flexible displays, when a finger is pressed on the flexible display for fingerprint recognition, the material of the patterned display is soft, so the area where the finger is pressed may sink, which not only affects the user experience, but also Affect the fingerprint recognition performance of the optical fingerprint module, and may even cause damage to the flexible display and the optical fingerprint module.

Summary of the invention

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

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

A support member configured to be arranged under the flexible display screen, the support member used to support the flexible display screen;

The first buffer layer is used to be arranged between the flexible display screen and the support, wherein there is a gap between the first buffer layer and the flexible display screen, or the first buffer layer and the support The gap exists between the support parts;

The optical fingerprint module is used to be arranged under the support, and the optical fingerprint module is used to collect the light signal returned by the reflection or scattering of the finger above the flexible display screen.

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

In a possible implementation manner, the first buffer layer is pasted on the upper surface of the support through a transparent glue layer.

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

In a possible implementation manner, the area of the transparent adhesive layer is greater than or equal to the area of the first buffer layer.

In a possible implementation manner, the foam layer of the flexible display screen is located below the first buffer layer, and the edge of the first buffer layer overlaps the edge of the light-transmitting window of the foam layer.

In a possible implementation manner, the device further includes:

The second buffer layer is used to be arranged between the support and the first buffer layer, and the gap exists between the second buffer layer and the first buffer layer.

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

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

In a possible implementation manner, the second buffer layer is pasted on the upper surface of the support through a transparent glue layer.

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

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

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

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

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

In a possible implementation manner, the middle frame is fixed on the lower surface of the support.

In a possible implementation manner, the support member is located in a light-transmitting window of the middle frame.

In a possible implementation manner, the upper surface of the middle frame and the upper surface of the support have the same height.

In a possible implementation manner, the edge of the support member is fixed on the lower surface of the foam layer of the flexible display screen.

In a possible implementation manner, the edge of the support member is fixed on the middle frame.

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

In a possible implementation manner, the first buffer layer is located in the light transmission window of the foam layer.

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

In a possible implementation manner, the upper surface of the metal sheet and the upper surface of the support have the same height.

In a possible implementation manner, the edge of the support member is fixed on the metal sheet.

In a possible implementation manner, the metal sheet is fixed on the lower surface of the foam layer.

In a possible implementation manner, the middle frame is fixed on the lower surface of the metal sheet.

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

In a possible implementation, the optical fingerprint module is pasted on the lower surface of the support.

In a possible implementation manner, the optical fingerprint module is fixed on the lower surface of the support through a fingerprint module bracket.

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

In a possible implementation manner, the optical fingerprint module is pasted on the lower surface of the middle frame of the electronic device.

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

In a possible implementation manner, a step structure is provided on a 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 a possible implementation manner, the flexible display screen includes a bending area and a non-bending area, and the device is arranged under the non-bending area of the flexible display screen.

In a possible implementation manner, the optical fingerprint module includes an optical component and an optical fingerprint sensor, the optical component is used to guide the optical signal to the optical fingerprint sensor, and the optical fingerprint sensor is used to The optical signal acquires fingerprint information of the finger.

In a possible implementation, the optical component includes an optical path modulation unit composed of an array of collimating holes.

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

In a possible implementation manner, the material of the support member is optical glass or resin.

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

In a second aspect, a fingerprint recognition device is provided, which is applied to an electronic device with a flexible display screen, and the device includes:

The first buffer layer is configured to be arranged under the flexible display screen, wherein the middle frame of the electronic device is arranged under the first buffer layer;

A support member configured to be arranged under the first buffer layer, and the support member used to support the flexible display screen;

In a possible implementation manner, the support member is pasted on the lower surface of the first buffer layer through a transparent glue layer.

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

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

In a possible implementation manner, the first buffer layer is pasted on the lower surface of the flexible display screen through a transparent glue layer.

In a possible implementation manner, the middle frame is pasted on the lower surface of the first buffer layer through a transparent glue layer.

In a third aspect, a terminal device is provided, including:

Flexible display; and,

The fingerprint recognition device in the first aspect or any possible implementation of the first aspect, or the fingerprint recognition device in the second aspect or any possible implementation of the second aspect.

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

Based on the above technical solution, by providing a buffer layer under the flexible display screen and a support under the buffer layer, the support can provide a supporting effect for the flexible display screen. In addition, due to the existence of the buffer layer, there is no direct contact between the support and the flexible display screen, which avoids damage to the flexible display screen. In addition, the first buffer layer can be used to adjust the gap between the support and the flexible display screen. A proper gap can prevent water ripples generated when the flexible display screen is deformed and reduce the deformation space after the flexible display screen is pressed.

Description of the drawings

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

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

FIG. 3 is a schematic block diagram of a fingerprint recognition device 300 according to an embodiment of the present application.

Fig. 4 is a schematic diagram of the area of the support equal to the fingerprint detection area.

Fig. 5 is a schematic diagram of the area of the support member being larger than the fingerprint detection area.

FIG. 6 is a schematic diagram of a possible structure of the device 300 shown in FIG. 3.

FIG. 7 is a schematic diagram of a possible structure of the device 300 shown in FIG. 3.

FIG. 8(a) is a schematic diagram of a possible structure of the device 300 shown in FIG. 3.

FIG. 8(b) is a schematic diagram of a possible structure of the device 300 shown in FIG. 3.

FIG. 9 is a schematic diagram of a possible structure of the device 300 shown in FIG. 3.

FIG. 10 is a schematic diagram of a possible structure of the device 300 shown in FIG. 3.

FIG. 11 is a schematic diagram of a possible structure of the device 300 shown in FIG. 3.

FIG. 12 is a schematic diagram of a possible structure of the device 300 shown in FIG. 3.

FIG. 13 is a schematic diagram of a possible structure of the device 300 shown in FIG. 3.

FIG. 14 is a schematic diagram of a possible structure of the device 300 shown in FIG. 3.

FIG. 15 is a schematic diagram of a possible structure of the device 300 shown in FIG. 3.

detailed description

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

It should be understood that the embodiments of this 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. The embodiments of this application only take optical fingerprint systems as an example for description, but should not The embodiments of the application constitute any limitation, and the embodiments of the present application are also applicable to other systems using optical imaging technology.

As a common application scenario, the optical fingerprint system provided in the embodiments of this application can be applied to smart phones, tablet computers, and other mobile terminals with display screens or other terminal devices; more specifically, in the above-mentioned terminal devices, the optical fingerprint The module may be specifically an optical fingerprint module, which may be arranged in a partial area or the entire area below the display screen to form an under-display or under-screen optical fingerprint system. Alternatively, the optical fingerprint module can also be partially or fully integrated into the display screen of the terminal device to form an in-display or in-screen optical fingerprint system.

Figures 1 and 2 show schematic diagrams of electronic devices to which the embodiments of the present application can be applied. 1 is a schematic diagram of the electronic device 10, and FIG. 2 is a schematic partial cross-sectional view of the electronic device 10 shown in FIG. 1 along the A-A' direction.

The terminal device 10 includes a display screen 120 and an optical fingerprint module 130. Wherein, the optical fingerprint module 130 is arranged in a partial area below the display screen 120. The optical fingerprint module 130 includes an optical fingerprint sensor, and the optical fingerprint sensor includes a sensing array 133 having a plurality of optical sensing units 131. The area where the sensing array 133 is located or its sensing area is the fingerprint detection area 121 of the optical fingerprint module 130 (also referred to as the fingerprint detection area 121, the fingerprint recognition area, etc.). 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 also be arranged in other positions, such as the side of the display screen 120 or the non-transparent area of the edge of the terminal device 10, and the optical fingerprint module 130 The optical signal of at least part of the display area of the display screen 120 is guided 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, through an optical path design such as lens imaging, a reflective folding optical path design, or other optical paths such as light convergence or reflection. The design can make the area of the fingerprint detection area 121 of the optical fingerprint module 130 larger than the area of the sensing array 133 of the optical fingerprint module 130. In other alternative implementations, if for example, light collimation is used for light path guidance, the fingerprint detection area 121 of the optical fingerprint module 130 can also be designed to be substantially the same as 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, he only needs to press his finger on the fingerprint detection area 121 of the display screen 120 to realize fingerprint input. Since fingerprint detection can be implemented in the screen, the terminal device 10 adopting the above structure does not need to reserve a space on the front side for the fingerprint button (such as the Home button), so that a full screen solution can be adopted, that is, the display area of the display screen 120 It can be basically extended to the front of the entire terminal device 10.

As an optional implementation manner, as shown in FIG. 1, the optical fingerprint module 130 includes a light detecting part 134 and an optical component 132. The light detection part 134 includes the sensing array 133, a reading circuit electrically connected to the sensing array 133, and other auxiliary circuits, which can be fabricated on a chip (Die) by a semiconductor process, such as an optical imaging chip or Optical fingerprint sensor. The sensing array 133 is specifically a photodetector (Photodetector) array, which includes a plurality of photodetectors distributed in an array, and the photodetectors can be used as the aforementioned optical sensing unit. The optical component 132 may be disposed above the sensing array 133 of the light detecting part 134, and it may specifically include a filter layer (Filter), a light guide layer or a light path guiding structure, and other optical elements. The filter layer It can be used to filter out ambient light penetrating the finger, and the light guide layer or light path guiding structure is mainly used to guide the reflected light reflected from the surface of the finger to the sensor array 133 for optical detection.

In terms of specific implementation, the optical assembly 132 and the light detecting part 134 may be packaged in the same optical fingerprint component. For example, the optical component 132 and the optical detection part 134 can be packaged in the same optical fingerprint chip, or the optical component 132 can be arranged outside the chip where the optical detection part 134 is located, for example, the optical component 132 is attached above the chip, or some components of the optical assembly 132 are integrated into the chip.

Wherein, the light guide layer or light path guiding structure of the optical component 132 has multiple implementation schemes. For example, the light guide layer may specifically be a collimator layer made on a semiconductor silicon wafer, which has multiple A collimating unit or a micro-hole array. The collimating unit can be specifically a small hole. Among the reflected light reflected from the finger, the light that is perpendicularly incident on the collimating unit can pass through and be passed by the optical sensing unit below it. The light with an excessively large incident angle is attenuated by multiple reflections inside the collimating unit. Therefore, each optical sensing unit can basically only receive the reflected light reflected by the fingerprint pattern directly above it. The sensing array 133 can detect the fingerprint image of the finger.

In another embodiment, the light guide layer or the light path guide 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, which The sensing array 133 of the light detecting part 134 is used to converge the reflected light reflected from the finger to the sensing array 133 of the light detection part 134 below, so that the sensing array 133 can perform imaging based on the reflected light, thereby obtaining a fingerprint image of the finger. Optionally, the optical lens layer may further have a pinhole formed 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 to improve The fingerprint imaging effect of the optical fingerprint module 130 is described.

In other embodiments, the light guide layer or the light path guide 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 can be grown by semiconductors. A process or other processes are formed above the sensing array 133 of the light detecting part 134, and each microlens may correspond to one of the sensing units of the sensing array 133, respectively. In addition, other optical film layers may be formed between the microlens layer and the sensing unit, such as a dielectric layer or a passivation layer. More specifically, between the microlens layer and the sensing unit, a light blocking layer (or called a light shielding layer) with microholes may also be included, wherein the microholes are formed between the corresponding microlens and the sensing unit. In between, the light blocking layer can block the optical interference between the adjacent microlens and the sensing unit, and make the light corresponding to the sensing unit converge into the microhole through the microlens and pass through the microhole. It is transmitted to the sensing unit for optical fingerprint imaging.

It should be understood that several implementation solutions of the above-mentioned light guide layer or light path guide structure can be used alone or in combination. For example, a micro lens 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 micro lens layer, its specific laminated structure or optical path may need to be adjusted according to actual needs.

As an optional embodiment, the display screen 120 may be a display screen with a self-luminous display unit, such as an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display or a micro-LED (Micro-LED) display Screen. Taking an OLED display screen as an example, the optical fingerprint module 130 may use the display unit (ie, 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 on the fingerprint detection area 121, the display screen 120 emits a beam of light 111 to the target finger 140 above the fingerprint detection area 121. The light 111 is reflected on the surface of the finger 140 to form reflected light or pass through all the fingers. The finger 140 scatters to form scattered light. In related patent applications, for ease of description, the above-mentioned reflected light and scattered light are collectively referred to as reflected light. Because the ridge 141 and valley 142 of the fingerprint have different light reflection capabilities, the reflected light 151 from the fingerprint ridge and the reflected light 152 from the fingerprint valley have different light intensities, and the reflected light passes through the optical component 132. After that, it is received by the sensor array 133 in the optical fingerprint module 130 and converted into a corresponding electrical signal, that is, a fingerprint detection signal; based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, thereby The terminal device 10 realizes the optical fingerprint recognition function.

In other embodiments, the optical fingerprint module 130 may also use a built-in 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 non-self-luminous display screens, such as liquid crystal display screens or other passively-luminous display screens. Taking a liquid crystal display with 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 also include an excitation light source for optical fingerprint detection. The excitation light source may specifically be an infrared light source or a light source of invisible light of a specific wavelength, which may be arranged under the backlight module of the liquid crystal display or arranged in the edge area under the protective cover of the terminal device 10, and the The optical fingerprint module 130 may be arranged under the edge area of the liquid crystal panel or the protective cover and guided by the light path so that the fingerprint detection light can reach the optical fingerprint module 130; or, the optical fingerprint module 130 may also be arranged at all Below the backlight module, and the backlight module is designed 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 uses a built-in light source or an external light source to provide an optical signal for fingerprint detection, the detection principle is the same as that described above.

It should be understood that, in specific implementation, the terminal device 10 further includes a transparent protective cover, and the cover may be a glass cover or a sapphire cover, which is located above the display screen 120 and covers the terminal. The front of the device 10. Therefore, in the embodiments of the present application, the so-called finger pressing on the display screen 120 actually refers to pressing on the cover plate above the display screen 120 or covering the surface of the protective layer of the cover plate.

On the other hand, in some embodiments, the optical fingerprint module 130 may include only one optical fingerprint sensor. At this time, the fingerprint detection area 121 of the optical fingerprint module 130 has a small area and a fixed position, so the user is performing During fingerprint input, it is necessary to press the finger to a specific position of the fingerprint detection area 121, otherwise the optical fingerprint module 130 may not be able to collect fingerprint images, resulting in poor user experience. In other alternative embodiments, the optical fingerprint module 130 may specifically include multiple optical fingerprint sensors. The multiple optical fingerprint sensors may be arranged side by side under the display screen 120 in a splicing manner, and the sensing areas of the multiple optical fingerprint sensors collectively constitute the fingerprint detection area 121 of the optical fingerprint module 130. In other words, the fingerprint detection area 121 of the optical fingerprint module 130 may include multiple sub-areas, and each sub-area corresponds to the sensing area of one of the optical fingerprint sensors, so that the fingerprint detection area of the optical fingerprint module 130 121 can be extended to the main area of the lower half of the display screen, that is, to the area where the finger is habitually pressed, so as to realize the blind fingerprint input operation. Alternatively, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 121 can also be extended to half of the display area or even the entire display area, thereby realizing half-screen or full-screen fingerprint detection.

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

The display screen 120 shown in FIG. 1 is an outward-turning folding display screen, and the display area of the display screen 120 is outside the display screen 120. However, the embodiment of the present application is also applicable to an inverted folding display screen. In this case, the display area of the display screen 120 may be inside the display screen 120.

The upper part of the display screen 120 may be covered with a flexible cover plate to protect the display screen 120. The material of the flexible cover plate may be, for example, a polyimide film (Polyimide Film, PI) flexible resin. In the following, the finger pressing the flexible display screen refers to pressing the flexible display screen and the flexible cover plate covered on the upper surface thereof by the finger, and will not be repeated for the sake of brevity.

The flexible cover cannot provide support for the display screen 120. In this case, when the user presses the fingerprint detection area 121 on the display screen 120 for fingerprint recognition, since the material of the flexible display screen 120 is relatively soft, the finger press area will sink, which not only affects the user experience, but may also affect the optical The fingerprint recognition performance of the fingerprint module may even cause damage to the flexible display and optical fingerprint module.

In view of this, an embodiment of the present application proposes a solution to prevent the flexible display screen from sinking, which can prevent the flexible display screen from sinking due to finger pressing during fingerprint identification.

Fig. 3 is a schematic diagram of a fingerprint identification device according to an embodiment of the present application. The fingerprint recognition device 300 is applied to an electronic device with a flexible display 310. Wherein, the fingerprint recognition device 300 includes a support 320, a first buffer layer 330 and an optical fingerprint module 340.

The support 320 is used to be disposed under the flexible display screen 310, and the support 320 is used to support the flexible display screen 310.

The first buffer layer 330 is used to be disposed between the flexible display screen 310 and the support 320.

The optical fingerprint module 340 is used to be disposed under the support 320, and the optical fingerprint module 340 is used to collect the light signal returned by the reflection or scattering of the finger above the flexible display 310.

Since the support 320 is provided between the flexible display 310 and the optical fingerprint module 340, the finger pressing area on the flexible display 310 will not sink due to the support of the support 320, thereby improving the user experience and avoiding The fingerprint recognition performance of the optical fingerprint module 340 is affected.

Moreover, since the first buffer layer 330 is arranged between the flexible display screen 310 and the support 320, the flexible display screen 310 and the rigid support 320 will not directly contact, thereby avoiding damage to the flexible display screen 310. .

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

The flexible display screen 310 may be, for example, a flexible LCD display screen or a flexible OLED display screen. Wherein, the light-emitting layer of the flexible OLED display screen may include a plurality of organic light-emitting diode light sources, and the optical fingerprint module 340 may use at least part 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 FIGS. 1 and 2. The display screen 120 may include, for example, at least one of a 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, and various glue layers. For the related description, please refer to the foregoing description on the display screen 120. For brevity, details are not repeated here.

The optical fingerprint module 340 may correspond to the optical fingerprint module 130 in FIGS. 1 and 2. For example, the optical fingerprint module 340 may include an optical component and an optical fingerprint sensor. Wherein, the optical component is used to guide the optical signal to the optical fingerprint sensor, and the optical fingerprint sensor is used to obtain fingerprint information of the finger according to the optical signal. The optical components include optical filters, optical path modulators and other optical components. Wherein, the optical path modulator may be composed of a collimating hole array, or at least one lens, or a micro lens array, for example. In addition, the optical fingerprint module 340 may also include a flexible circuit board and the like. For the relevant description of the optical fingerprint module 340, please refer to the description of the optical fingerprint module 130 in the foregoing FIG. 1 and FIG. 2, which will not be repeated for the sake of brevity.

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 310. The fingerprint detection area 121 may be located anywhere in the flexible display screen 310, for example, may be located at the edge or the middle of the flexible display screen 310.

During fingerprint recognition, the light emitted by the light source illuminates 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 recognition on the finger according to the collected optical signal.

The supporting member 320 is disposed between the flexible display screen 310 and the fingerprint recognition module 320 to support the flexible display screen 310. When the finger presses the fingerprint detection area 121 in the flexible display screen 310, the support 320 can prevent the display screen from sinking in the finger press area. In addition, since the first buffer layer 330 is provided between the support 320 and the flexible display screen 310, direct collision between the flexible display screen 310 and the support 320 when the finger is pressed on the fingerprint detection area 121 can be avoided, thereby further protecting Flexible display 310.

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

The supporting member 320 should also have a certain degree of hardness to realize the support for the flexible display screen 310.

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

The hardness of the first buffer layer 330 should be in an appropriate range to support the flexible display screen 310 and cushion the pressing force of the finger on 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 support 320.

For example, the first buffer layer 330 may be made of transparent materials 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, that is, the first buffer layer 330 is composed of multiple material layers.

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

At this time, the first buffer layer 330 not only serves as a buffer, but also can be used to adjust the gap 360 between the support 320 and the flexible display 310. Moreover, the flexible buffer layer 330 strengthens the flexible display screen 310 to a certain extent.

Generally, when the distance between the flexible display screen 310 and the support 320 is too small, for example, a few microns, the water ripple phenomenon caused by light interference is more obvious. However, when the distance between the flexible display screen 310 and the supporting member 320 is too large, the flexible display screen 310 may be damaged by finger pressing. Therefore, 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 support 320. Therefore, the size of the gap 360 between the flexible display screen 310 and the support 320 can be controlled by adjusting the thickness of the first buffer layer 330, thereby The water ripple phenomenon caused by the deformation of the flexible display screen 310 is avoided, and the deformation space of the flexible display screen 310 is reduced.

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

The area of the support 320 may be equal to the area of the fingerprint detection area 121 or 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 the entire flexible display screen 310.

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

For another example, as shown in FIG. 5, the area occupied by the support 320 is within the dashed frame in FIG. It can be seen that the area of the support 320 is larger than the area of the fingerprint detection area 121 and covers the non-bending area of the flexible display screen 310. At this time, the support 320 can not only support the part of the flexible display screen 310 in the fingerprint detection area 121, but also support the non-bending 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 310 where it is located, or even covering the entire flexible display. 310.

In addition, the areas of the first buffer layer 330 and the supporting member 320 may be equal or unequal. The area of the support 320 and the first buffer layer 330 is not limited here.

The following describes two methods for fixing the first buffer layer 330 provided by the embodiment of the present application with reference to FIGS. 6 to 10.

Way 1

The first buffer layer 330 is fixed on the upper surface of the support 320.

For example, the first buffer layer 330 is pasted on the upper surface of the support 320 through the transparent glue layer 331.

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

OCA can be a kind of double-sided adhesive tape without matrix material formed by making optical acrylic glue without substrate, and then attaching a layer of release film on the upper and lower bottom layers. That is, OCA can be an optically transparent one. Double-sided tape without substrate.

OCA can also be any adhesive used to bond transparent optical elements such as lenses, as long as it has colorless and transparent, light transmittance greater than a certain threshold such as 90%, good bonding strength, and can be cured at room temperature or medium temperature. The characteristics such as small curing shrinkage are enough. For example, the OCA may be replaced by optical clear resin (OCR). By using a material with a low curing shrinkage rate, it is possible to avoid damage to the flexible display screen due to molding shrinkage.

By controlling the modulus of OCA and the hardness after curing, the wrinkles caused by the stress on the flexible display screen 310 during use can be avoided.

FIG. 6 is a schematic diagram of a possible structure of the fingerprint recognition device when the method 1 is adopted. FIG. 6 shows the flexible display screen 310, the first buffer layer 330, the support 320, the optical fingerprint module 340, and the middle frame 350. FIG. 6 also shows the foam layer 311 and the metal foil 312 of the flexible display screen 310. The metal foil 312 is pasted on the lower surface of the flexible display screen 310 through the adhesive layer 313, and the foam layer 311 is pasted on the bottom surface of the metal foil 312. . The foam layer 311 in the embodiment of the present application can be considered to include foam and the glue layer on the upper and lower surfaces of the foam, that is, foam glue. The middle frame 350 and the support 320 are pasted on the lower surface of the foam layer 311, and the support 320 is located in the light-transmitting window of the middle frame 350. The first buffer layer 330 is pasted on the upper surface of the support 320 through the transparent adhesive layer 331, and there is an air gap 360 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 bracket 341.

In FIG. 6, the first buffer layer 330 is fixed on the upper surface of the support 320, and there is a gap 360 between the first buffer layer 330 and the flexible display screen 310. Therefore, the support 320 can provide a supporting function for the flexible display screen 310 during fingerprint recognition. In addition, due to the existence of the first buffer layer 330, the support 320 and the flexible display screen 310 are not in direct contact, thereby avoiding damage to the flexible display screen 310.

The air gap 360 between the first buffer layer 330 and the flexible display screen 310 can avoid the water ripple phenomenon caused by the deformation of the flexible display screen 310. In addition, 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, which reduces the deformation space after the flexible display screen 310 is pressed, and further protects the flexible display screen 310.

Way 2

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

For example, the first buffer layer 330 is pasted on the lower surface of the flexible display screen 310 through the transparent glue layer 331.

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

Optionally, the area of the transparent glue 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 overlaps the edge of the light-transmitting window of the foam layer 311.

Since the upper surface of the first buffer layer 330 is pasted on the lower surface of the flexible display 310, and the lower surface edge of the first buffer layer 330 overlaps and is pasted on the upper surface edge of the transparent window of the foam layer 311, The fixing strength of the first buffer layer 330 will not cause the edge of the first buffer layer 330 to lift up when a finger presses the flexible display screen 310, avoiding the generation of bubbles, and improving fingerprint recognition performance.

FIG. 7 is a schematic diagram of a possible structure of the fingerprint recognition device when the method 2 is adopted. FIG. 7 shows the flexible display 310, the first buffer layer 330, the support 320, the optical fingerprint module 340, and the middle frame 350. FIG. 7 also shows the foam layer 311 and the metal foil 312 of the flexible display screen 310. Among them, the metal foil 312 and the first buffer layer 330 are pasted on 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 transparent window of the metal foil 312. The foam layer 311 is pasted on the lower surface of the metal foil 312. The upper surface of the first buffer layer 330 is pasted on 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 overlaps the edge of the upper surface of the foam layer 311. The middle frame 350 and the support 320 are pasted on the lower surface of the foam layer 311, and the support 320 is located in the light-transmitting window of the middle frame 350. There is an air gap 360 between the first buffer layer 330 and the support 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 pasted on the lower surface of the flexible display screen 310 through a transparent glue layer 331 with a large area, and there is a gap 360 between the first buffer layer and the support 320. Therefore, the support 320 can provide a supporting function for the flexible display screen 310 during fingerprint recognition. In addition, due to the existence of the first buffer layer 330, the support 320 and the flexible display screen 310 are not in direct contact, thereby avoiding damage to the flexible display screen 310.

The air gap 360 between the first buffer layer 330 and the support 320 can avoid the water ripple phenomenon caused by the deformation of the flexible display screen 310. In addition, 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, which reduces the deformation space after the flexible display screen 310 is pressed, and further protects the flexible display screen 310.

Fig. 8(a) and Fig. 8(b) are schematic diagrams of another possible structure of the fingerprint recognition device when the method 2 is adopted. FIG. 8 shows the flexible display screen 310, the first buffer layer 330, the support 320, the optical fingerprint module 340, and the middle frame 350. FIG. 8 also shows the foam layer 311 and the metal foil 312 of the flexible display screen 310. Among them, the metal foil 312 is pasted on the lower surface of the flexible display 310 through the adhesive layer 313, and the foam layer 311 is pasted on the lower surface of the metal foil 312. The middle frame 350 and the support 320 are pasted on the lower surface of the foam layer 311, and the support 320 is located in the light-transmitting window of the middle frame 350. The first buffer layer 330 is pasted on the lower surface of the flexible display screen 310 through the transparent glue layer 331, and there is an air gap 360 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 FIGS. 8(a) and 8(b), the first buffer layer 330 is pasted on the lower surface of the flexible display screen 310 through a transparent glue layer 331 with a small area, and there is a gap 360 between the first buffer layer 330 and the support 320. Therefore, the support 320 can provide a supporting function for the flexible display screen 310 during fingerprint recognition. In addition, due to the existence of the first buffer layer 330, the support 320 and the flexible display screen 310 are not in direct contact, thereby avoiding damage to the flexible display screen 310.

Among them, the difference between Fig. 8(a) and Fig. 8(b) is the optical fingerprint module 340. The optical fingerprint module 340 in Fig. 8(a) includes a lens for reflecting the light signal reflected by the finger Converge to the optical fingerprint sensor. Since the lens requires a certain imaging distance, the optical fingerprint module 340 can be fixed on the lower surface of the support 320 through the fingerprint module bracket 341 to ensure a proper imaging distance. The optical fingerprint module 340 in FIG. 8(b) is an ultra-thin fingerprint module. The optical fingerprint module 340 may include, for example, an array of collimating holes for guiding the light signal reflected by the finger to the optical fingerprint sensor. At this time, the optical fingerprint module 340 can be directly pasted on the lower surface of the support 320 through the adhesive layer 342.

This application does not make any restrictions on the structure and type of the optical fingerprint module 340. In addition, the optical fingerprint module 340 may include one optical fingerprint sensor, or may include multiple optical fingerprint sensors spliced together.

In the embodiment 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 is used to be disposed between the support 320 and the first buffer layer 330, and the second buffer layer 370 and the first buffer layer 330 There is a gap 360 between.

When the first buffer layer 330 is pasted on the upper surface of the flexible display screen 310, optionally, the second buffer layer 370 is pasted on the upper surface of the support 320 through the transparent glue layer 371.

The second buffer layer 370 can be used to transmit optical signals, so that the optical signals reflected by the finger above the flexible display 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 light-transmitting openings.

The hardness of the second buffer layer 370 should be in an appropriate range to buffer the pressing force of the finger on 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 transparent materials such as TPU, PI, or PET.

The second buffer layer 370 may also be a composite material layer, that is, the second buffer layer 370 is composed of multiple material layers.

Generally, the middle frame 350 of the electronic device can be used to support the display screen and fix other parts thereof. The middle frame 350 has a light-transmitting window located below the fingerprint detection area 121 so that the finger from above the fingerprint detection area 121 The reflected optical signal can be transmitted to the optical fingerprint module 340 through the transparent window.

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

At this time, optionally, a metal sheet 380 can be arranged between the middle frame 350 of the electronic device and the flexible display 310. The embodiment of the present application does not limit the thickness of the metal sheet, for example, it may be less than 300 microns, or 50-200 microns.

The metal sheet 380 has a light-transmitting window, the light-transmitting window is located under the fingerprint detection area 121 and is used to transmit the light signal from the fingerprint detection area 121.

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

The thickness of the metal sheet 380 increases the gap between the flexible display screen 310 and the support 320. Therefore, the second buffer layer 370 can be provided to adjust the gap due to the thickness of the metal sheet 380, thereby reducing the flexible display. The deformation space of the screen 310 when it is compressed. In addition, the size of the gap 360 is controlled by adjusting the thickness of the second buffer layer 370, so as to avoid the water ripple phenomenon caused by the deformation of the flexible display screen 310. In addition, the second buffer layer 370 can also be used to buffer the pressing force of the finger on the flexible display 310.

The metal sheet 380 can be considered as a part of the middle frame 350, can also be considered as a part of the flexible display screen 310, or can also be considered as a component relatively independent of the middle frame 350 and the flexible display screen 310, and is arranged under 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 middle frame 350 and a metal sheet 380. Wherein, the metal sheet 380 is pasted on the lower surface of the flexible display 310 through the adhesive layer 381. The middle frame 350 and the supporting member 320 are pasted on 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 pasted on the lower surface of the flexible display 310 through the transparent adhesive layer 331, the second buffer layer 370 is pasted on the upper surface of the support 320 through the transparent adhesive layer 371, and the first buffer layer 330 and the second buffer layer There is an air gap 360 between 370. The optical fingerprint module 340 is fixed on the lower surface of the support 320 through the fingerprint module bracket 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 support 320, and there is a gap between the first buffer layer 330 and the second buffer layer 370. Gap 360. Therefore, the support 320 can provide a supporting function for the flexible display screen 310 during fingerprint recognition. In addition, due to the existence of the first buffer layer 330 and the second buffer layer 370, the support 320 and the flexible display screen 310 are not in direct contact, thereby avoiding damage to the flexible display screen 310.

The gap 360 between the first buffer layer 330 and the second buffer layer 370 can avoid the water ripple 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 support 320, reduce the deformation space of the flexible display screen 310 after being pressed, and further protect the flexible display screen 310 .

In the embodiment of the present application, the support 320 may be arranged on the lower surface of the flexible display screen 310. For example, the edge of the support 320 is glued to the lower surface of the foam layer 311 of the flexible display 310. When the support 320 is glued to 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 can also be arranged on the middle frame 350, for example, pasted on the middle frame On 350, for example, a step structure is provided on the inner side of the transparent window of the middle frame 350 near the upper surface, and the support 320 is fixed on the step structure.

In the fingerprint identification device shown in FIGS. 6-9, the support 320 is fixed on the lower surface of the foam layer 311 of the flexible display 310 as an example for description, but the position of the support 320 is not discussed in this application. Make any restrictions.

In the embodiment of the present application, the middle frame 350 may be arranged under the flexible display screen 310. For example, the middle frame 350 is pasted on the bottom surface of the foam layer 311 of the flexible screen 310, and the middle frame 350 is pasted on the bottom surface of the foam layer 311. At this time, the support 320 may be located in the light-transmitting window of the middle frame 350; the middle frame 350 may also be arranged below the support 320, for example, the middle frame 350 is pasted on the lower surface of the support 320. At this time, the support 320 is for example It may cover the entire upper surface of the middle frame 350; the middle frame 350 may also be arranged under the metal sheet 380, for example, the middle frame 350 is pasted on the lower surface of the metal sheet 380.

When a metal sheet 380 for supporting the flexible display screen 310 is provided between the flexible display screen 310 and the middle frame 350, the support 320 may be located in the light transmission window of the metal sheet 380.

For example, as shown in FIG. 10, compared with FIG. 6, the metal sheet 380 is increased or decreased in FIG. FIG. 10 shows the flexible display screen 310, the first buffer layer 330, the support 320, the optical fingerprint module 340, the metal sheet 380 and the middle frame 350. The first buffer layer 330 is pasted on the upper surface of the support 320 through the transparent adhesive layer 331, and there is an air gap 360 between the first buffer layer 330 and the flexible display screen 310. The metal sheet 380 is pasted on the lower surface of the foam layer 311, and the support 320 is located in the transparent window of the metal sheet 380. The middle frame 350 is fixed on 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 bracket 341.

In FIG. 10, the support 320 is used to support the part of the flexible display screen 310 in the fingerprint detection area, and the metal sheet 380 is used to support the part of the flexible display screen 310 outside the fingerprint detection area. The support 320 and the metal sheet 380 can realize the function of the cover glass on the non-flexible screen.

The support 320 is arranged in the light-transmitting window of the metal sheet 380, so that the fingerprint identification device 340 and the flexible display screen 310 are independent of each other, which facilitates the replacement and maintenance of the fingerprint identification module 340.

The embodiment of the present application does not limit the positional relationship and respective shapes of the support 210, the metal sheet 380, and the middle frame 350. The support 320 may be arranged in the light-transmitting window of the metal sheet 380 or the light-transmitting window of the middle frame 350; or, the support 320 may also be located in the light-transmitting window of the metal sheet 380 and the middle frame 350 at the same time 11, the support 320 is located in the transparent window of the metal sheet 380 and the middle frame 350, and the lower side of the support 320 is made with a step structure to realize the metal sheet 380 and the transparent window that are different from the transparent window. The coordination of the middle frame 350.

In the fingerprint identification device shown in FIGS. 6 to 11, only the middle frame 350 or the metal sheet 380 is pasted on the lower surface of the foam layer 311 as an example for description, but this application focuses on the middle frame 350 and the metal sheet The location of 380 is not limited.

It should be noted that when the middle frame 350 and the support 320 are both pasted on the lower surface of the foam layer 311, preferably, as shown in FIGS. 6-9, the height of the upper surface of the support 320 is the same as the upper surface of the middle frame 350. The height is the same. There is no step difference between the support 320 and the middle frame 350 on the side close to the flexible display 310, that is, a flat surface. This can ensure that the flexible display 310 will not produce appearance trace defects due to the existence of the support 320, and avoid the flexible display 310 has a "bulging" phenomenon due to the support 320.

When the metal sheet 380 and the support 320 are both pasted on the lower surface of the foam layer 311, preferably, as shown in FIGS. 10 and 11, the height of the upper surface of the support 320 is the same as the upper surface of the metal sheet 380. The height is the same. The support 320 and the side of the metal sheet 380 close to the flexible display screen 310 have no step difference, that is, a flat surface, so as to avoid appearance trace defects of the flexible display screen 310.

It should be understood that the support 320 described in the embodiment of the present application is located in the light-transmitting window of the middle frame 350, 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 support 320 and the upper surface of the middle frame 350 are the same, but the height of the support 320 and the lower surface of the middle frame 350 may be different.

Similarly, the support 320 is located in the light-transmitting window of the metal sheet 380, which means that the support 320 is partially or completely located in the light-transmitting window of the metal sheet 380. The height of the support 320 and the upper surface of the metal sheet 380 are the same, but the height of the support 320 and the lower surface of the metal sheet 380 may be different.

In the embodiment of the present application, there may be no gap 360 between the support 320 and the flexible display screen 310. For example, the first buffer layer 330 is pasted on the lower surface of the flexible display screen 310, and the support 320 is pasted on the lower surface of the first buffer layer 330. The support 320 is used to support the flexible display 310 to prevent the flexible display 310 from sinking due to finger pressing, and the first buffer layer 330 can prevent the flexible display 310 from directly contacting the support 320, thereby protecting the flexible display 310.

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

For example, the support 320 and the middle frame 350 are both disposed on the lower surface of the first buffer layer 310. Wherein, the supporting member 320 is partially or completely located in the transparent window of the middle frame 350.

Taking FIG. 12 as an example, the flexible display screen 310, the first buffer layer 330, the supporting member 320, the optical fingerprint module 340 and the middle frame 350 are shown. Wherein, the first buffer layer 330 is pasted on the lower surface of the flexible display screen 310 through the transparent glue layer 331. The support 320 and the middle frame 350 are pasted on the lower surface of the first buffer layer 330 through the transparent adhesive layer 332. 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 bracket 341.

During fingerprint recognition, the supporting member 320 can provide a supporting function for the flexible display screen 310. In addition, due to the existence of the first buffer layer 330 and the second buffer layer 370, the support 320 and the flexible display screen 310 are not in direct contact, thereby avoiding damage to the flexible display screen 310.

For another example, as shown in FIG. 13 and FIG. 14, a metal sheet 380 is provided under the flexible display screen 310. The first buffer layer 330 is pasted on the lower surface of the flexible display 310 through the transparent adhesive layer 331. The support 320 and the middle frame 350 are pasted on the lower surface of the first buffer layer 330 through the transparent adhesive layer 332. The middle frame 350 is fixed on 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 bracket 341. Wherein, the supporting member 320 is located in the light transmitting window of the metal sheet 380, as shown in FIG. 13; or, the supporting member 320 may be located in the light transmitting window of the metal sheet 380 and the middle frame 350 at the same time, as shown in FIG.

In FIGS. 13 and 14, the supporting member 320 is used to support the part of the flexible display screen 310 in the fingerprint detection area, and the metal sheet 380 is used to support the part of the flexible display screen 310 outside the fingerprint detection area. The support 320 and the metal sheet 380 can realize the function of the cover glass on the non-flexible screen.

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

Taking FIG. 15 as an example, the middle frame 350 is pasted on the lower surface of the first buffer layer 330 through the adhesive layer 332. The support 320 is set on the lower surface of the buffer layer 330 through the middle frame 350, wherein the support 320 is fixed on the bottom surface of the middle frame 350. On the stepped structure on the upper side of the light-transmitting window, and the gap may be provided 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 provided between the support 320 and the flexible display screen 310. For example, the first buffer layer 330 and the transparent glue layer 331 are removed in FIG. At this time, the supporting function of the support 320 to the flexible display screen 310 can still be realized. The features in the embodiments of the present application are also applicable to this situation.

The first buffer layer 330 and/or the second buffer layer 370 can avoid direct contact between the flexible display screen 310 and the support 320, and further protect the flexible display screen 310.

In the embodiment of the present application, when a larger area of the first buffer layer 330 is provided, the foam layer 331 may be omitted, and the first buffer layer 330 realizes the function of the foam layer. For example, the area of the first buffer layer 330 in FIG. 10 covers the flexible display screen 310. Therefore, the foam layer 331 may not be provided, and the first buffer layer 330 performs heat dissipation buffering and other functions.

In the 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 attached to the lower surface of the supporting member 320, and for example, the optical fingerprint module 340 is fixed on the lower surface of the supporting member 320 through a fingerprint module bracket 341.

The optical fingerprint module 340 can also be fixed on the middle frame 350. For example, the optical fingerprint module 340 is pasted on the lower surface of the middle frame 350, and for example, the optical fingerprint module 340 is fixed on the lower surface of the middle frame 350 through the fingerprint module bracket 341, and for example, in the transparent window of the middle frame 350. A side close to the lower surface is provided with a step structure and the edge of the optical fingerprint module 340 is fixed on the step structure.

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

An embodiment of the present application also provides an electronic device, which includes a flexible display screen and the fingerprint recognition device in the various embodiments of the present application described above.

Optionally, the electronic device further includes a middle frame.

As an example and not a limitation, the electronic devices in the embodiments of the present application may be portable or mobile computing devices such as terminal devices, mobile phones, tablet computers, notebook computers, desktop computers, game devices, in-vehicle electronic devices, or wearable smart devices, and Electronic databases, automobiles, bank automated teller machines (Automated Teller Machine, ATM) and other electronic equipment. The wearable smart device includes full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones Use, such as various types of smart bracelets, smart jewelry and other equipment for physical sign monitoring.

It should be noted that, under the premise of no conflict, the various embodiments described in this application and/or the technical features in each embodiment can be combined with each other arbitrarily, and the technical solutions obtained after the combination should also fall within the protection scope of this application. .

It should be understood that the specific examples in the embodiments of the present application are only to help those skilled in the art to better understand the embodiments of the present application, rather than limiting the scope of the embodiments of the present application. Those skilled in the art can base on the above-mentioned embodiments. Various improvements and modifications are made, and these improvements or modifications fall within the scope of protection of the present application.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A fingerprint recognition device, characterized in that it is applied to an electronic device with a flexible display screen, and the device includes:

A support member configured to be arranged under the flexible display screen, the support member used to support the flexible display screen;

The first buffer layer is used to be arranged between the flexible display screen and the support, wherein there is a gap between the first buffer layer and the flexible display screen, or the first buffer layer and the support The gap exists between the support parts;

The optical fingerprint module is used to be arranged under the support, and the optical fingerprint module is used to collect the light signal returned by the reflection or scattering of the finger above the flexible display screen.
The device according to claim 1, wherein the hardness of the first buffer layer is between the hardness of the flexible display screen and the hardness of the support.
The device according to claim 1 or 2, wherein the first buffer layer is pasted on the upper surface of the support through a transparent glue layer.
The device according to claim 1 or 2, wherein the first buffer layer is pasted on the lower surface of the flexible display screen through a transparent glue layer.
The device according to claim 4, wherein the area of the transparent adhesive layer is greater than or equal to the area of the first buffer layer.
The device according to claim 4 or 5, wherein the foam layer of the flexible display screen is located below the first buffer layer, and the edge of the first buffer layer overlaps the foam layer The edge of the light-transmitting window.
The device according to any one of claims 4 to 6, wherein the device further comprises:

The second buffer layer is used to be arranged between the support and the first buffer layer, and the gap exists between the second buffer layer and the first buffer layer.
7. The device according to claim 7, wherein the second buffer layer is pasted on the upper surface of the support through a transparent glue layer.
The device according to claim 7 or 8, wherein a metal sheet is provided between the middle frame of the electronic device and the flexible display screen, and the second buffer layer is located on the transparent surface of the metal sheet. Inside the light window.
The device according to any one of claims 7 to 9, wherein the hardness of the second buffer layer is between the hardness of the flexible display screen and the hardness of the support.
The device according to any one of claims 7 to 10, wherein the second buffer layer is a composite material layer.
The device according to any one of claims 7 to 11, wherein the material of the second buffer layer is polyurethane TPU, polyimide PI or polyester PET.
The device according to any one of claims 7 to 12, wherein the second buffer layer is a transparent layer.
The device according to any one of claims 3 to 13, wherein the material of the transparent adhesive layer is optically transparent adhesive OCA glue or transparent glue.
The device according to any one of claims 1 to 14, wherein the first buffer layer is a composite material layer.
The device according to any one of claims 1 to 15, wherein the middle frame of the electronic device is fixed on the lower surface of the support.
The device according to any one of claims 1 to 15, wherein the support is located in a light-transmitting window of the middle frame of the electronic device.
The device according to claim 17, wherein the upper surface of the middle frame and the upper surface of the support have the same height.
The device according to claim 17 or 18, wherein the edge of the support member is fixed on the lower surface of the foam layer of the flexible display screen.
The device according to claim 17 or 18, wherein the edge of the support member is fixed on the middle frame.
The device according to any one of claims 17 to 20, wherein the middle frame is fixed on the lower surface of the foam layer.
The device according to any one of claims 17 to 21, wherein the first buffer layer is located in the light transmission window of the foam layer.
The device according to any one of claims 1 to 15, wherein a metal sheet is provided between the middle frame of the electronic device and the flexible display screen, and the support is located on the metal sheet Inside the light-transmitting window.
The device according to claim 23, wherein the upper surface of the metal sheet and the upper surface of the support have the same height.
The device according to claim 23 or 24, wherein the edge of the support member is fixed on the lower surface of the foam layer of the flexible display screen.
The device according to claim 23 or 24, wherein the edge of the support member is fixed on the metal sheet.
The device according to any one of claims 23 to 26, wherein the metal sheet is fixed on the lower surface of the foam layer.
The device according to any one of claims 23 to 27, wherein the middle frame is fixed on the lower surface of the metal sheet.
The device according to any one of claims 1 to 28, wherein the optical fingerprint module is fixed on the support.
The device of claim 29, wherein the optical fingerprint module is attached to the lower surface of the support.
The device according to claim 29, wherein the optical fingerprint module is fixed on the lower surface of the support through a fingerprint module bracket.
The device according to any one of claims 1 to 29, wherein the optical fingerprint module is fixed on the middle frame of the electronic device.
The device of claim 32, wherein the optical fingerprint module is attached to the lower surface of the middle frame.
The device of claim 32, wherein the optical fingerprint module is fixed on the lower surface of the middle frame by a fingerprint module bracket.
The device according to claim 32, wherein a side of the light-transmitting window of the middle frame close to the lower surface is provided with a step structure, and the edge of the optical fingerprint module is fixed on the step structure.
The device according to any one of claims 1 to 35, wherein the flexible display screen comprises a bending area and a non-bending area, and the device is arranged in the non-bending area of the flexible display screen. Below.
The device according to any one of claims 1 to 36, wherein the optical fingerprint module comprises an optical component and an optical fingerprint sensor, and the optical component is used to guide the optical signal to the optical fingerprint Sensor, the optical fingerprint sensor is used to obtain fingerprint information of the finger according to the light signal.
The device according to claim 37, wherein the optical component comprises a light path modulation unit composed of an array of collimating holes.
The device according to claim 37, wherein the optical component comprises an optical path modulation unit composed of at least one lens.
The device according to any one of claims 1 to 39, wherein the material of the support member is optical glass or resin.
The device according to any one of claims 1 to 40, wherein the material of the first buffer layer is TPU, PI or PET.
The device according to any one of claims 1 to 41, wherein the support and the first buffer layer are transparent layers.
A fingerprint recognition device, characterized in that it is applied to an electronic device with a flexible display screen, and the device includes:

The first buffer layer is configured to be arranged under the flexible display screen, wherein the middle frame of the electronic device is arranged under the first buffer layer;

A support member, configured to be arranged under the first buffer layer; the support member used to support the flexible display screen;

The optical fingerprint module is used to be arranged under the support, and the optical fingerprint module is used to collect the light signal returned by the reflection or scattering of the finger above the flexible display screen.
The device according to claim 43, wherein the support member is located in a light-transmitting window of the middle frame.
The device of claim 44, wherein the upper surface of the middle frame and the upper surface of the support have the same height.
The device according to claim 44 or 45, wherein the edge of the support member is fixed on the middle frame.
The device according to claim 44 or 45, wherein the support member is pasted on the lower surface of the first buffer layer through a transparent glue layer.
The device according to any one of claims 44 to 47, wherein the middle frame is fixed on the lower surface of the first buffer layer.
The device according to claim 43, wherein a metal sheet is arranged between the middle frame of the electronic device and the flexible display screen, and the support is located in the light-transmitting window of the metal sheet.
The device of claim 49, wherein the upper surface of the metal sheet and the upper surface of the support have the same height.
The device according to claim 49 or 50, wherein the edge of the support member is fixed on the metal sheet.
The device according to claim 51, wherein the supporting member is pasted on the lower surface of the first buffer layer through a transparent glue layer.
The device according to claim 49 or 50, wherein the edge of the support member is fixed on the metal sheet.
The device according to any one of claims 49 to 53, wherein the metal sheet is fixed on the lower surface of the first buffer layer.
The device according to any one of claims 49 to 54, wherein the middle frame is fixed on the lower surface of the metal sheet.
The device according to any one of claims 43 to 55, wherein the hardness of the first buffer layer is between the hardness of the flexible display screen and the hardness of the support.
The device according to any one of claims 43 to 56, wherein the first buffer layer is pasted on the lower surface of the flexible display screen through a transparent glue layer.
The device according to any one of claims 43 to 57, wherein the middle frame is attached to the lower surface of the first buffer layer through a transparent glue layer.
The device according to claim 57 or 58, wherein the material of the transparent adhesive layer is optically transparent adhesive OCA glue or transparent glue.
The device according to any one of claims 43 to 59, wherein the first buffer layer is a composite material layer.
The device according to any one of claims 43 to 60, wherein the optical fingerprint module is fixed on the support.
The device of claim 60, wherein the optical fingerprint module is attached to the lower surface of the support.
The device according to claim 60, wherein the optical fingerprint module is fixed on the lower surface of the support through a fingerprint module bracket.
The device according to any one of claims 43 to 60, wherein the optical fingerprint module is fixed on the middle frame.
The device according to claim 64, wherein the optical fingerprint module is attached to the lower surface of the middle frame.
The device of claim 65, wherein the optical fingerprint module is fixed on the lower surface of the middle frame through a fingerprint module bracket.
The device according to claim 66, wherein a side of the light-transmitting window of the middle frame close to the lower surface is provided with a step structure, and the edge of the optical fingerprint module is fixed on the step structure.
The device according to any one of claims 43 to 67, wherein the flexible display screen comprises a bending area and a non-bending area, and the device is arranged in the non-bending area of the flexible display screen. Below.
The device according to any one of claims 43 to 68, wherein the optical fingerprint module comprises an optical component and an optical fingerprint sensor, and the optical component is used to guide the optical signal to the optical fingerprint Sensor, the optical fingerprint sensor is used to obtain fingerprint information of the finger according to the light signal.
The device according to claim 69, wherein the optical component comprises an optical path modulation unit composed of an array of collimating holes.
The device of claim 69, wherein the optical component comprises an optical path modulation unit composed of at least one lens.
The device according to any one of claims 43 to 71, wherein the material of the support is optical glass or resin.
The device according to any one of claims 43 to 72, wherein the material of the first buffer layer is polyurethane TPU, polyimide PI or polyester PET.
The device according to any one of claims 43 to 73, wherein the support and the first buffer layer are transparent layers.
An electronic device, characterized in that, the electronic device includes:

Flexible display; and,

The fingerprint recognition device according to any one of claims 1 to 42, or the fingerprint recognition device according to any one of claims 43 to 74.
The electronic device according to claim 75, wherein the electronic device further comprises a middle frame.