WO2020215187A1

WO2020215187A1 - Device for fingerprint recognition and electronic device

Info

Publication number: WO2020215187A1
Application number: PCT/CN2019/083728
Authority: WO
Inventors: 龙卫; 曾凡洲
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2019-04-22
Filing date: 2019-04-22
Publication date: 2020-10-29
Also published as: CN211375619U; CN110799990A; CN110799990B

Abstract

A device for fingerprint recognition and an electronic device. The device for fingerprint recognition is applicable in the electronic device having a flexible display screen and is capable of implementing in-display fingerprint recognition of the flexible display screen. The device comprises: an optical fingerprint module, a fingerprint detection area of the optical fingerprint module being located in the flexible display screen, the optical fingerprint module being used for being provided under the fingerprint detection area to collect an optical signal reflected by a finger on the fingerprint detection area; and a supporting element, the supporting element being used for being provided between the flexible display screen and the optical fingerprint module, and being used for supporting a part of the flexible display screen in the fingerprint detection area, where the supporting element is fixed to the undersurface of 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, a fingerprint identification method, and an electronic device, 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:

An optical fingerprint module, the fingerprint detection area of the optical fingerprint module is located in the flexible display screen, and the optical fingerprint module is configured to be arranged below the fingerprint detection area to collect fingers above the fingerprint detection area Reflected light signal; and,

The supporting member is configured to be arranged between the flexible display screen and the optical fingerprint module, and is used to support the part of the flexible display screen in the fingerprint detection area, wherein the supporting member is fixed on the The bottom surface of the flexible display.

In a possible implementation manner, the support member is pasted on the lower surface of the flexible display screen.

In a possible implementation manner, the adhesive material between the support and the flexible display screen is an optically transparent adhesive OCA.

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

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

In a possible implementation manner, the adhesive material between the middle frame and the support is OCA.

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 support member and/or the outer ring portion of the middle frame and the flexible display screen are reinforced by glue.

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

In a possible implementation manner, a groove with an opening facing downward is provided on the support, and the optical fingerprint module is at least partially arranged in the groove of the support.

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

In a possible implementation manner, the outer ring portion of the optical fingerprint module and the supporting member are reinforced by glue.

In a possible implementation manner, the area of the support is equal to or greater than the area of the fingerprint detection area.

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

In a possible implementation manner, the thickness of the support member is 0.1 to 0.8 mm.

In a possible implementation manner, the support member is fixed on the lower surface of the foam layer of the flexible display screen, or the support member is at least partially disposed in the light-transmitting window of the foam layer.

In a possible implementation manner, the optical fingerprint module includes one optical fingerprint sensor chip, or includes multiple optical fingerprint sensor chips spliced together.

In a possible implementation manner, the distance between the optical fingerprint sensor chip in the optical fingerprint module and the light emitting layer of the flexible display screen is 150 to 300 microns.

In a second aspect, a terminal device is provided, including a flexible display screen and the fingerprint recognition device in the first aspect or any possible implementation of the first aspect.

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

Based on the above technical solution, since a transparent support is set between the flexible display screen and the optical fingerprint module, when the finger is pressed in the fingerprint detection area for fingerprint recognition, the part of the flexible display screen located in the fingerprint detection area will Due to the blocking of the transparent support, it will not cause sagging, thereby improving the user experience, avoiding the impact on the fingerprint recognition performance of the optical fingerprint module, and reducing the damage to the flexible display screen and the optical fingerprint module.

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 structural diagram of a possible fingerprint identification device according to an embodiment of the present application.

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

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

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

Detailed ways

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 a fingerprint detection area, a 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 the above-mentioned several implementation schemes of the 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 130 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, pressing the flexible display screen with a finger refers to pressing the flexible display screen and the flexible cover plate covered on the upper surface thereof by the finger.

The flexible cover cannot provide support for the display screen 120. In this case, when the user presses the fingerprint detection area 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 fingerprint The fingerprint recognition performance of the 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 identification device 300 is applied to an electronic device with a flexible display 310, and the fingerprint identification device 300 includes:

Optical fingerprint module 320: The fingerprint detection area of the optical fingerprint module 320 is located in the flexible display 310, and the optical fingerprint module 320 is used to be arranged under the fingerprint detection area to collect the light reflected by the finger above the fingerprint detection area. Signal; and,

Supporting member 330: used to be arranged between the flexible display screen 310 and the optical fingerprint module 320, and used to support the part of the flexible display screen 310 in the fingerprint detection area.

Since the transparent support 330 is arranged between the flexible display 310 and the optical fingerprint module 320, when the finger is pressed in the fingerprint detection area for fingerprint recognition, the part of the fingerprint detection area in the flexible display 310 will be affected by The transparent support 330 blocks without causing sagging, thereby improving user experience, avoiding the impact on the fingerprint recognition performance of the optical fingerprint module 320, and reducing damage to the flexible display 310 and the optical fingerprint module 320 .

The flexible display 310 may be, for example, a flexible LCD display or a flexible OLED display. 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 420 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, for example. 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 copper foil, a foam layer, a display light-shielding and heat-dissipating buffer layer, and various adhesive layers and supports. 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 320 may, for example, correspond to the optical fingerprint module 130 in FIGS. 1 and 2. For example, the optical fingerprint module 320 may include one optical fingerprint sensor chip or multiple optical fingerprint sensor chips spliced together, and each optical fingerprint sensor chip may include one or more optical fingerprint sensors or optical fingerprint sensor arrays. In addition, it can also include light path guiding structure, filter unit, flexible circuit board, etc. For related descriptions, please refer to the foregoing description of the optical fingerprint module 130. For brevity, details are not repeated.

The distance between the optical fingerprint module 320 and the flexible display 310 may satisfy certain conditions. For example, the distance between the optical fingerprint sensor chip of the optical fingerprint module 320 and the light-emitting layer of the flexible display 310 is between 150 and 300 microns , To ensure the imaging requirements of the optical fingerprint module 320 for fingerprint images.

In the embodiment of the present application, the fingerprint detection area of the optical fingerprint module 320 is at least partially located in the display area of the flexible display 310. The fingerprint detection area can be located at any position in the flexible display screen 310, and is determined according to the position of the bending area 312 (or referred to as the folding area) of the flexible display screen 310. For example, it may be located at the edge or in 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, and the light signal reflected by the finger reaches the optical fingerprint module 320. The optical fingerprint module 320 performs fingerprint recognition on the finger according to the collected optical signal carrying the fingerprint information of the finger.

The transparent support 330 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 in the flexible display screen 310, the transparent support 330 can prevent the display screen from sinking in the finger press area. The part of the transparent support 330 located below the fingerprint detection area has high light transmittance, so as to avoid blocking the optical signal carrying fingerprint information from the fingerprint detection area, so that the optical signal can smoothly reach the optical fingerprint module 320.

The transparent supporting member 330 may be made of, for example, a transparent material such as optical glass or resin, as long as the portion of the supporting member 330 located below the fingerprint detection area can transmit light, which is not limited in this application.

The area of the support 330 may be equal to the area of the fingerprint detection area.

For example, as shown in FIG. 4, the support 330 may be located below the fingerprint detection area 402, and the area 401 occupied by the support 330 substantially overlaps the fingerprint detection area 402. In other words, the area of the support 330 is approximately equal to the fingerprint detection area. The area of area 401.

The area of the support 330 may also be larger than the area of the fingerprint detection area.

For example, as shown in FIG. 5, the dashed frame 501 shown in FIG. 5 is the area occupied by the support 330. It can be seen that although the support 330 is used to support the part of the flexible display 310 in the fingerprint detection area 502, the area of the support 330 can be larger than the area of the fingerprint detection area 502, for example, covering the entire area of the flexible display 310 Or part of the non-folding area, even covering the entire area of the flexible display 310.

The thickness of the transparent support 330 may be 0.1 to 0.8 mm, for example.

The embodiment of the present application provides two ways for fixing the support 300.

Way 1

The support 330 is fixed on the lower surface of the flexible display screen 310.

For example, the support 330 may be pasted on the lower surface of the flexible display screen 310.

Wherein, the adhesive material between the support 300 and the flexible display screen 310 may be, for example, an optically clear adhesive (OCA) or the like.

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

In this embodiment, the supporting member 330 is attached to the lower surface of the flexible display screen 310. The optical fingerprint module 320 is disposed under the support 330. The optical fingerprint module 320 can be arranged under the support 330 in the following two ways. The following descriptions are made with reference to FIGS. 6 to 9 respectively.

In one implementation, the optical fingerprint module 320 is disposed under the support 330 through the middle frame 340 of the electronic device.

Electronic devices, such as terminal devices, usually include a middle frame 340 to support components such as the flexible display 310. The middle frame 340 has a light-transmitting window located below the fingerprint detection area so that fingers from above the fingerprint detection area The reflected optical signal can be transmitted to the optical fingerprint module 320 through the transparent window.

In the embodiment of the present application, the middle frame 340 may be fixed on the lower surface of the support 330.

For example, the middle frame 340 is pasted on the lower surface of the support 330. Wherein, the middle frame 340 can be pasted on the lower surface of the support 330 by, for example, OCA glue.

In the embodiment of the present application, the middle frame 340 may also be fixed on the lower surface of the flexible display screen 310. For example, part or all of the support 330 is located in the light transmission window of the middle frame 340.

Preferably, the height of the upper surface of the supporting member 330 and the upper surface of the middle frame 340 are the same to avoid the appearance of the flexible display screen 310.

The optical fingerprint module 320 can be fixed on the middle frame 340.

For example, the light-transmitting window of the middle frame 340 is provided with a step structure on the side close to the lower surface, and the edge of the optical fingerprint module 320 is fixed on the step structure.

In other words, the support 330 is fixed on the lower surface of the flexible display screen 310, and the middle frame 340 is fixed on the lower surface of the support 330. The optical fingerprint module 320 is fixed on the middle frame 340, so that the optical fingerprint module 320 is fixed under the support 330 through the middle frame 340.

Take Figure 6 as an example for description. 6 shows the flexible display 310, the optical fingerprint module 320, the support 330 and the middle frame 340. Wherein, the supporting member 330 is pasted on the lower surface of the flexible display screen 310 through a glue 350 such as OCA. The middle frame 340 is pasted on the lower surface of the support 330 by laminating glue 360 such as OCA. A light-transmitting window is provided on the middle frame 340, and the light-transmitting window is located below the fingerprint detection area. When the finger presses in the fingerprint detection area, the support 330 can support the depression of the finger pressing area in the flexible display screen, which reduces the damage of the optical fingerprint module 320 due to the depression of the flexible display screen.

As shown in FIG. 6, the lower side of the light-transmitting window of the middle frame 340 is provided with a step structure, and the optical fingerprint module 320 is fixed on the step structure. The optical fingerprint module 320 may pass through the light-transmitting window of the middle frame 340 to receive the light signal emitted by the display screen 310 and formed after being reflected by the finger, and the light signal carries the fingerprint information of the finger.

The flexible display screen 310 may also include a foam layer at the bottom. Here, the bottom foam and back glue of the flexible display screen 310 are collectively referred to as a foam layer. The foam layer can be used for shading, heat dissipation and heat dissipation of the flexible display screen. Cushioning, etc., not shown in Figure 6.

The supporting member 330 can be fixed on the lower surface of the foam layer of the flexible display screen 310; or the supporting member 330 can also be arranged in the light-transmitting window of the foam layer of the flexible display screen 310. At this time, the transparent foam layer The light window is greater than or equal to the area of the support 330, so that when the support 330 is pasted under the flexible display 310, the support 330 can be accommodated in the light-transmitting window of the foam layer.

In addition, the outer ring portion of the support 330 and the flexible display screen 310 can also be reinforced by an edge banding glue 370.

In another implementation manner, the optical fingerprint module 320 is fixed on the lower surface of the support 330.

In this embodiment, the optical fingerprint module 320 does not need to be fixed under the support 330 through the middle frame 340, but is directly fixed on the support 330.

For example, the optical fingerprint module 320 can be directly attached to the lower surface of the support 330.

Further, optionally, a groove with an opening facing downward is provided on the supporting member 320, and at least part of the optical fingerprint module 330 is disposed in the groove of the supporting member 320.

For example, the optical fingerprint module 320 is fixed on the lower surface of the support 330 through the flexible circuit board 321 at the lower part thereof.

The optical fingerprint module 320 may have a separate Flexible Printed Circuit Board (FPC) and a connector, so as to be attached to the flexible display 310 or the middle frame 340 as an independent component.

The optical fingerprint sensor chip in the optical fingerprint module 320 is arranged on the flexible circuit board 321, and optical elements such as filters can also be arranged above the optical fingerprint sensor chip. The optical fingerprint module 320 is fixed under the support 330 through the circuit board 350, which avoids directly attaching the optical components of the optical fingerprint module 320 to the support 330, which can reduce the installation difficulty of the optical fingerprint module 320 And complexity, and improve maintainability.

In addition, for the scenario where the optical fingerprint module 320 includes multiple optical fingerprint sensor chips, multiple optical fingerprint sensor chips can be fixed under the support 330 at one time, which can reduce installation complexity and improve installation efficiency.

The circuit board 350 is arranged in parallel below the support 330. The circuit board 350 may have a bent portion. The shape of the bending portion may be a U shape, for example. The two ends of the U-shaped bent portion are parallel to each other. In addition, a rigid reinforcing plate, such as a metal reinforcing plate, can be arranged between the two ends of the U row. At this time, the optical fingerprint sensor of the optical fingerprint module 320 can be bonded to the reinforcing plate.

The edge of the flexible circuit board 321 may be fixed at a non-groove on the lower surface of the support 330, so that the optical fingerprint sensor and other optical elements of the optical fingerprint module 320 are accommodated in the groove with the opening of the support 330 downward.

Take Figure 7 and Figure 8 as an example for description. The fingerprint recognition device shown in FIG. 7 is located below the edge of the flexible display screen 310, and the fingerprint recognition device shown in FIG. 8 is located below the middle of the flexible display screen 310.

The flexible display 310, the optical fingerprint module 320 and the support 330 are shown in FIGS. 7 and 8. Wherein, the supporting member 330 is pasted on the lower surface of the flexible display screen 310 through a glue 350 such as OCA. The support 330 is provided with a groove with a downward opening. The optical fingerprint module 320 includes a flexible circuit board 321. The flexible circuit board 321 is pasted on a non-groove on the lower surface of the support 330 through an adhesive 380 such as double-sided tape. The upper surface of the optical fingerprint module 320 is pasted in the groove through the glue 350, so that part of the optical elements of the optical fingerprint module 320 are arranged in the groove. When the finger presses in the fingerprint detection area, the support 330 can support the depression of the finger pressing area in the flexible display screen, which reduces damage to the optical fingerprint module 320 due to the depression of the flexible display screen.

In FIGS. 7 and 8, the support 330 is fixed on the lower surface of the flexible display screen 310, and the optical fingerprint module 320 is directly fixed on the lower surface of the support 330. The optical fingerprint module 320 does not need to be arranged under the flexible display screen 310 through the middle frame, but is arranged under the flexible display screen 310 through the support 330. At this time, optionally, the middle frame may not be provided in the terminal device, but the corresponding function of the middle frame is realized through the support 330.

In addition, as shown in FIGS. 7 and 8, the support 330 is attached to the lower surface of the foam layer 311 of the flexible display screen 310. Due to the existence of the light-transmitting window, there is an air gap 313 between the support 330 and the flexible display screen 310 below the fingerprint detection area. The air gap 313 can be used to avoid hard contact between the flexible display screen 310 and the transparent support 330 and protect the flexible display screen 310 from being damaged. In addition, the air gap 313 can also be replaced by a transparent and soft silicone layer or a support rib formed by foam.

The supporting member 330 may be fixed on the lower surface of the foam layer 311 of the flexible display screen 310 as shown in FIGS. 7 and 8; or the supporting member 330 may also be arranged in the light-transmitting window of the foam layer of the flexible display screen 310 At this time, the light transmission window of the foam layer 311 is greater than or equal to the area of the support 330, so when the support 330 is pasted under the flexible display 310, the support 330 can be accommodated in the foam layer 311 Inside the light-transmitting window.

In addition, the outer ring portion of the optical fingerprint module 320 and the supporting member 330 are reinforced by an edge sealant 370.

Way 2

The support 330 is fixed on the middle frame 340 of the electronic device.

For example, a side of the transparent window of the middle frame 340 close to the upper surface is provided with a step structure, and the edge of the support 330 is fixed on the step structure.

Preferably, the upper surface of the support 330 and the upper surface of the middle frame 340 have the same height. Therefore, the "bulging" phenomenon of the flexible display screen caused by the support member being higher than the middle frame is avoided, and the image display and life span of the flexible display screen are not affected.

The optical fingerprint module 320 can be fixed on the middle frame 340. For example, a step structure is provided in the light-transmitting window of the middle frame 340 on the side close to the lower surface, and the edge of the optical fingerprint module 320 is fixed on the step Structurally.

Alternatively, the optical fingerprint module 320 may be fixed on the lower surface of the support 330, for example, directly pasted on the lower surface of the support 330.

Take Figure 9 as an example for description. The flexible display 310, the optical fingerprint module 320, the support 330 and the middle frame 340 are shown in FIG. Wherein, the middle frame 340 is pasted on the lower surface of the flexible display screen 310 through a glue 390 such as OCA. The support 330 is disposed on the middle frame 340. As shown in FIG. 9, a side of the light-transmitting window of the middle frame 340 close to the upper surface is provided with a step structure, and the support 330 is fixed on the step structure. When the finger presses in the fingerprint detection area, the support 330 can support the depression of the finger pressing area in the flexible display screen, which reduces the damage of the optical fingerprint module 320 due to the depression of the flexible display screen.

As shown in FIG. 9, the lower side of the transparent window of the middle frame 340 is provided with a step structure, and the optical fingerprint module 320 is fixed on the step structure. The optical fingerprint module 320 can pass through the light-transmitting window of the middle frame 340 to receive the light signal from the display screen 310 that is reflected by the finger.

In addition, the outer ring portion of the middle frame 340 and the flexible display screen 310 can also be reinforced by an edge sealant 370.

In mode 2, the support 330 and the optical fingerprint module 320 are both fixed on the middle frame 340, and both the support 330 and the optical fingerprint module 320 are fixed under the flexible display 310 through the middle frame 340. The supporting member 330 can be effectively arranged under the flexible display screen 310, and the structure of the fingerprint recognition device is relatively compact.

In Mode 1, the support 330 is fixed to the lower surface of the flexible display 310, and the optical fingerprint module 320 is fixed under the support 330 through the middle frame 340 or directly fixed to the lower surface of the support 330. The support 330 can be effectively arranged under the flexible display screen 310 to support the flexible display screen. The implementation is relatively simple, and the structure of the middle frame 340 does not need to be changed, and the "bulging" phenomenon caused by the support 330 due to the process and the like can be avoided.

In the embodiments of the present application, each glue layer located on the optical path of fingerprint recognition should be a transparent glue layer so as not to affect the collection of optical signals. The adhesive layers on the non-optical path can be other non-transparent adhesive layers. 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:

An optical fingerprint module, the fingerprint detection area of the optical fingerprint module is located in the flexible display screen, and the optical fingerprint module is configured to be arranged below the fingerprint detection area to collect fingers above the fingerprint detection area Reflected light signal; and,

A support, the support is configured to be arranged between the flexible display screen and the optical fingerprint module, and is used to support a portion of the flexible display in the fingerprint detection area, wherein the support Fixed on the lower surface of the flexible display screen.
The device according to claim 1, wherein the supporting member is attached to the lower surface of the flexible display screen.
The device according to claim 2, wherein the adhesive material between the support and the flexible display screen is an optically transparent adhesive OCA.
The device according to any one of claims 1 to 3, wherein the middle frame of the electronic device is fixed on the lower surface of the support, and the optical fingerprint module is fixed on the middle frame .
The device according to claim 4, wherein the middle frame is glued to the lower surface of the support.
The device according to claim 5, wherein the adhesive material between the middle frame and the support is OCA.
The device according to any one of claims 4 to 6, wherein a step structure is provided in the transparent window of the middle frame on the side close to the lower surface, and the edge of the optical fingerprint module is fixed at the The step structure.
7. The device according to any one of claims 4 to 7, wherein the support member and the outer ring portion of the middle frame and the flexible display screen are reinforced by glue.
The device according to any one of claims 1 to 3, wherein the optical fingerprint module is fixed on the lower surface of the support.
9. The device according to claim 9, wherein the supporting member is provided with a groove with an opening facing downward, and the optical fingerprint module is at least partially disposed in the groove of the supporting member.
The device according to claim 9 or 10, wherein the optical fingerprint module is fixed on the lower surface of the support through a flexible circuit board of the optical fingerprint module.
The device according to any one of claims 9 to 11, wherein the outer ring portion of the optical fingerprint module and the supporting member are reinforced by glue.
The device according to any one of claims 1 to 12, wherein the area of the support is equal to or larger than the area of the fingerprint detection area.
The device according to any one of claims 1 to 13, wherein the supporting member is made of optical glass or resin.
The device according to any one of claims 1 to 14, wherein the thickness of the support member is 0.1 to 0.8 mm.
The device according to any one of claims 1 to 15, wherein the support member is fixed on the lower surface of the foam layer of the flexible display screen, or the support member is at least partially disposed on the foam layer. Inside the light-transmitting window of the cotton layer.
The device according to any one of claims 1 to 16, wherein the optical fingerprint module comprises one optical fingerprint sensor chip or a plurality of optical fingerprint sensor chips spliced together.
The device according to any one of claims 1 to 17, wherein the distance between the optical fingerprint module and the flexible display screen is 150 to 300 microns.
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 18.
The electronic device according to claim 19, wherein the electronic device further comprises a middle frame.