WO2020118631A1

WO2020118631A1 - Fingerprint recognition apparatus and electronic device

Info

Publication number: WO2020118631A1
Application number: PCT/CN2018/120922
Authority: WO
Inventors: 熊峰; 郭益平
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2018-12-13
Filing date: 2018-12-13
Publication date: 2020-06-18
Also published as: CN109716351A; CN112949593A; CN109716351B

Abstract

Provided are a fingerprint recognition apparatus and an electronic device. When the fingerprint recognition apparatus is applied to an electronic device, the fingerprint recognition apparatus is arranged between a display screen of the electronic device and a middle bezel of the electronic device, and there is a gap between the fingerprint recognition apparatus and the display screen. According to the fingerprint recognition apparatus and the electronic device in the embodiments of the present application, the fingerprint recognition apparatus can be completely decoupled from a display screen, thereby avoiding the problems of high costs, low efficiency, a complicated process, etc. caused by poor bonding; moreover, the fingerprint recognition apparatus is arranged between the display screen and a middle bezel, such that there is no need to avoid various parts inside the electronic device, for example, the fingerprint recognition apparatus and a battery can overlap in the thickness direction of the electronic device, such that the placement position of the fingerprint recognition apparatus is no longer limited.

Description

Fingerprint identification device and electronic equipment

Technical field

The present application relates to the field of fingerprint identification technology, and in particular to a fingerprint identification device and electronic equipment.

Background technique

There are two main schemes of under-screen optical fingerprint recognition that have been disclosed. The first is an optical path modulator solution based on a periodic microhole array, which requires that the fingerprint identification module and the screen (such as Organic Light-Emitting Diode (OLED)) be closely attached. The second is based on the micro lens solution, which is to separate the fingerprint recognition module from the screen and fix it under the middle frame of the electronic device.

In the first scheme, there may be problems such as high cost, low efficiency, and complicated process caused by poor fitting; in the second scheme, it is necessary to avoid battery space, sound cavity, sub-board, motor, user An identification card (Subscriber Identification Module, SIM), etc. can meet the requirements of electronic devices.

Summary of the invention

In view of this, embodiments of the present application provide a fingerprint identification device and electronic equipment, which can better meet the needs of electronic equipment, and can reduce costs, improve efficiency, and simplify assembly.

In a first aspect, there is provided a fingerprint recognition device, which is provided between a display screen of the electronic device and a middle frame of the electronic device when the fingerprint recognition device is applied to an electronic device, and There is a gap with the display screen.

In a possible implementation, the fingerprint identification device is fixed on the upper surface of the middle frame.

In a possible implementation manner, a groove is extended downward on the upper surface of the middle frame, and the fingerprint identification device is fixed in the groove.

In a possible implementation manner, the fingerprint identification device is fixed in the groove by conductive or non-conductive double-sided adhesive.

In a possible implementation manner, the fingerprint identification device is fixed in the groove through a mechanical connection structure.

Optionally, the depth of the groove may be less than or equal to 0.3 mm.

In a possible implementation manner, at least one laminate is provided between the upper surface of the fingerprint recognition device and the lower part of the display screen, the at least one laminate has an opening, and the fingerprint recognition device is at least partially accommodated In the opening, to receive the light transmitted from the display screen.

The stacked openings under the screen can ensure an effective optical path, and at the same time, it can also form a good seal between the display screen and the fingerprint recognition device, to avoid contamination of foreign objects and affecting imaging quality.

In a possible implementation manner, the at least one laminate layer includes a foam layer, and the foam layer is attached to the upper surface of the fingerprint identification device.

A foam with a certain thickness and size retention is attached to the upper surface of the fingerprint recognition device, and the compression rate of the foam can be greater than 50%, thereby forming a sealed environment between the fingerprint recognition device under the display screen and achieving light and dust resistance. Claim.

In a possible implementation manner, the fingerprint identification device includes: a sensor chip; a through-hole array, the through-hole array is disposed above the sensor chip, and is used for The light is directed onto the sensing unit of the sensor chip.

In a possible implementation, the sensor chip is fixed on the surface of the flexible printed circuit board or the reinforced steel sheet of the flexible printed circuit board.

Bonding the sensor chip on the surface of the reinforced steel sheet of the flexible printed circuit board can effectively reduce the thickness of the fingerprint recognition device.

In a possible implementation manner, the fingerprint identification device further includes a bracket, and the bracket is used to fix the through-hole array above the sensor chip.

In a possible implementation manner, the fingerprint identification device further includes: an optical filter disposed between the sensor chip and the through-hole array; the optical filter is attached to the sensor chip Or the optical filter is fixed on the bracket and has a gap with the sensor chip.

In a possible implementation manner, the fingerprint identification device includes a plurality of sensor chips, and the plurality of sensor chips are distributed side by side on a flexible printed circuit board.

Distribute multiple sensor chips side by side on the flexible printed circuit board, so that multiple fingerprint detection areas can be formed, which is beneficial to achieve full-screen fingerprint unlocking, which can improve the user experience.

In a second aspect, an electronic device is provided, including a display screen, a middle frame, and the fingerprint identification device in the first aspect or any possible implementation manner of the first aspect.

In a possible implementation manner, the display screen is an organic light emitting diode OLED screen.

In a possible implementation, the middle frame is a metal or plastic structure.

By setting the fingerprint recognition device between the display screen and the middle frame with a gap between the display screen, the fingerprint recognition device and the display screen can be completely decoupled, avoiding the high cost and efficiency caused by poor fitting Low and complicated process; at the same time, the fingerprint recognition device is installed between the display screen and the middle frame, and there is no need to avoid various parts inside the electronic device. For example, the fingerprint recognition device and the battery can be in the thickness direction of the electronic device The coincidence makes the placement of the fingerprint identification device no longer limited.

These or other aspects of the present application will be more concise and understandable in the description of the following embodiments.

BRIEF DESCRIPTION

FIG. 1 shows a schematic block diagram of an application scenario of an embodiment of the present application.

2 is a schematic structural diagram of a typical fingerprint identification device.

FIG. 3 is a schematic structural diagram of another typical fingerprint identification device.

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

FIG. 5 is another schematic structural diagram of a fingerprint identification device according to an embodiment of the present application.

6 is a schematic diagram of an assembly process of a fingerprint identification device according to an embodiment of the present application.

7 is a schematic block diagram of an electronic device according to an embodiment of the present application.

detailed description

In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art should fall within the protection scope of the embodiments of the present application.

A common application scenario, the fingerprint identification device provided by the embodiments of the present application may be applied to smartphones, tablet computers, and other mobile terminals or other terminal devices with display screens; more specifically, in the above terminal devices, the fingerprint identification device It may be specifically an optical fingerprint device, which may be provided in a partial area or all areas below the display screen to form an under-display optical fingerprint system.

As shown in FIG. 1, it is a schematic structural diagram of a terminal device to which an embodiment of the present application can be applied. The terminal device 100 includes a display screen 120 and a fingerprint recognition device 130, where the fingerprint recognition device 130 is disposed below the display screen 120 Local area. The fingerprint recognition device 130 may include a sensing array having a plurality of optical sensing units, wherein the sensing array may also be a fingerprint sensor. The area where the sensing array is located or its optical sensing area is the fingerprint detection area 103 of the fingerprint identification device 130. As shown in FIG. 1, the fingerprint detection area 103 is located in the display area 102 of the display screen 120. Therefore, when the user needs to unlock the terminal device 100 or other fingerprint verification, he only needs to place his finger Pressing on the fingerprint detection area 103 located on the display screen 120 can realize fingerprint input. Since fingerprint detection can be implemented in the screen, the terminal device 100 adopting the above structure does not need a special reserved space on the front of it to set fingerprint keys (such as the Home key).

As a preferred embodiment, the display screen 120 may use a display screen with a self-luminous display unit, such as an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display screen or a micro light-emitting diode (Micro-LED) display screen . In addition, the display screen 120 may be specifically a touch display screen, which can not only display images, but also detect a user's touch or press operation, thereby providing a human-computer interaction interface for the user. For example, in an embodiment, the terminal device 100 may include a touch controller, and the touch controller may specifically be a touch panel, which may be provided on the surface of the display screen 120, or may be partially integrated or integrated as a whole Go inside the display screen 120 to form the touch display screen. Taking an OLED display screen as an example, the fingerprint recognition device 130 may use a display unit (ie, an OLED light source) of the OLED display screen 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection.

In other embodiments, the fingerprint identification device 130 may also use an internal light source or an external light source to provide an optical signal for fingerprint detection. In this case, the fingerprint identification device 130 may be applicable to non-self-luminous display screens, such as liquid crystal display screens or other passive light-emitting display screens. Taking an LCD screen with a backlight module and a liquid crystal panel as an example, in order to support under-screen fingerprint detection of the LCD screen, the fingerprint recognition device 130 may further include an excitation light source for optical fingerprint detection, the excitation light source It may specifically be an infrared light source or a light source with a specific wavelength of invisible light, which may be provided under the backlight module of the liquid crystal display or the edge area under the protective cover of the terminal device 100, and the fingerprint identification device 130 is arranged below the backlight module, and the backlight module allows the fingerprint detection light to pass through the liquid crystal panel and the backlight module through openings or other optical design of the film layers such as the diffusion sheet, the brightness enhancement sheet, the reflection sheet, etc. Reach the induction array of the fingerprint identification device 130.

In addition, the sensing array of the fingerprint recognition device 130 may specifically be a photodetector array, which includes a plurality of photodetectors distributed in an array, and the photodetectors may be used as the optical sensing unit as described above . When a finger is pressed against the fingerprint detection area 103, the light emitted by the display unit of the fingerprint detection area 103 is reflected on the fingerprint on the surface of the finger and forms reflected light, wherein the reflected light of the ridge and valley of the finger fingerprint is different , The reflected light is transmitted from the display screen 120 and received by the photodetector array 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 Further perform fingerprint matching verification, so as to realize an optical fingerprint recognition function in the terminal device 100.

In other alternative embodiments, the fingerprint recognition device 130 may also be provided in the entire area below the display screen 120, thereby extending the fingerprint detection area 103 to the entire display area 102 of the entire display screen 120, to achieve Full screen fingerprint recognition.

It should be understood that, in a specific implementation, the terminal device 100 may further include a transparent protective cover 110, and the cover 110 may be a glass cover or a sapphire cover, which is disposed above the display screen 120 and Cover the front of the terminal device 100. Therefore, in the embodiment of the present application, the so-called finger pressing on the display screen 120 actually means pressing on the cover plate 110 above the display screen 120 or covering the surface of the protective layer of the cover plate 110.

As an optional implementation manner, as shown in FIG. 1, the fingerprint recognition device 130 may include a light detection part 134 and an optical component 132, the light detection part 134 includes the sensing array and is electrically connected to the sensing array The connected reading circuit and other auxiliary circuits may be fabricated on a chip through a semiconductor process; that is, the light detection portion 134 may be fabricated on an optical imaging chip or an image sensor chip.

The optical component 132 may be disposed above the sensing array of the light detection portion 134. The optical component 132 may include a filter layer, a light guide layer, and other optical elements; the filter layer may be used for The ambient light penetrating the finger is filtered out, and the light guide layer is mainly used to guide (eg, optically collimate or converge) the reflected light reflected from the finger surface to the sensing array for optical detection.

The light emitted by the display screen 120 is reflected on the surface of the finger to be detected above the display screen 120, and the reflected light reflected from the finger is optically collimated or concentrated by the micro-hole array or the lens unit, and then further After being filtered by the filter layer, the optical detection portion 134 receives the reflected light, and the optical detection portion 134 can further detect the received reflected light, thereby acquiring a fingerprint image of the finger to implement fingerprint recognition.

It should be understood that the above-mentioned fingerprint recognition device 130 is only an exemplary structure. In a specific implementation, the position of the filter layer of the optical component 132 is not limited to below the light guide layer; for example, in an alternative In an embodiment, the filter layer may also be disposed between the light guide layer and the display screen 120, that is, above the light guide layer; or, the optical component 132 may include two filter layers, The two are respectively arranged above and below the light guide layer. In other alternative embodiments, the filter layer may also be integrated into the light guide layer, or may even be omitted, which is not limited in this application.

In a specific implementation, the optical component 132 and the light detection portion 134 can be packaged in the same optical fingerprint chip. It may also be installed in the fingerprint recognition device as a relatively independent component from the optical detection part 134, that is, the optical component 132 is disposed outside the chip where the light detection part 134 is located, such as bonding the optical component 132 Above the chip, or part of the components of the optical assembly 132 are integrated in the chip. There are various implementation solutions for the light guide layer of the optical component 132.

In one embodiment, the light guide layer of the optical component 132 is specifically an optical path modulator or an optical path collimator made of a semiconductor silicon wafer or other substrate (such as silicon oxide or nitride), which has Multiple optical path modulation units or collimation units. Specifically, the optical path modulation unit or collimation unit may be specifically a through hole having a high aspect ratio, so the multiple collimation units or lens units may constitute a through hole array. In the reflected light reflected from the finger, the light incident on the optical path modulation unit or the collimating unit can pass through and be received by the optical sensing unit below it, and each optical sensing unit can basically receive the light passing above it The reflected light of the fingerprint texture guided by the hole, so that the sensing array can detect the fingerprint image of the finger.

In other alternative embodiments, the light guide layer may also include an optical lens (Lens) layer having one or more optical lens units, such as a lens group composed of one or more aspheric lenses. The reflected light reflected from the finger is collimated or condensed by the optical lens unit and then received by the optical sensing unit below it. According to this, the sensing array can detect the fingerprint image of the finger.

On the other hand, the sensor array of the light detection part 134 may specifically include only a single sensor array, or a dual sensor array (Dual Array) or multiple sensor array (Multiple Array) with two or more sensor arrays arranged side by side ) Architecture. When the light detection part 134 adopts a dual-sensing array or multi-sensing array architecture, the optical component 132 may use a single light guide layer to simultaneously cover the two or more sensing arrays; alternatively, the optical component 132 may also include two or more light guide layers arranged side by side, such as two or more optical path modulators or optical path collimators, or two or more optical lens layers, the two or more light guide layers arranged side by side The light layers are respectively arranged above the two or more sensing arrays, and are used for guiding or concentrating the related reflected light to the sensing arrays below it.

In other alternative implementations, the display screen 120 may also use a non-self-luminous display screen, such as a backlit liquid crystal display screen; in this case, the fingerprint recognition device 130 cannot use the display screen 120 The display unit is used as an excitation light source. Therefore, it is necessary to integrate an excitation light source inside the fingerprint recognition device 130 or set an excitation light source outside to realize optical fingerprint detection. The detection principle is the same as that described above.

It should be understood that although in the embodiment shown in FIG. 1 the fingerprint recognition device is taken as an example of an under-screen optical fingerprint recognition device, in other embodiments, the fingerprint recognition device of the terminal device 100 may also use ultrasonic waves Fingerprint recognition devices or other types of fingerprint recognition devices instead. This application does not specifically limit the type and specific structure of the fingerprint recognition device, as long as the above fingerprint recognition device can meet the performance requirements for fingerprint recognition inside the display screen of the terminal device.

Please refer to FIG. 2. In a typical fingerprint recognition device, the lower surface of the protective cover 210 is attached to the upper surface of the OLED display 220, and the fingerprint recognition device 230 is glued to the OLED display 220 through glue 240. The lower surface of the is adhered, and the lower surface of the fingerprint recognition device 230 is soldered and fixed to the flexible circuit board 250. Specifically, the glue material 240 may be formed on the outer side wall of the fingerprint identification device 230, so that the outer side wall of the fingerprint identification device 230 and the lower surface of the OLED display 220 are completely fitted and fixed. In addition, the lower surface edge of the OLED display 220 is attached to the upper surface of the middle frame 270 through the foam adhesive 260, and the middle frame 270 has a groove structure in the area where the fingerprint recognition device 230 is located. The groove structure can be used for fingerprints The identification device 230 and the flexible circuit board 250 underneath provide an escape space. In addition, a battery 280 may be provided between the middle frame 270 and the rear cover 290.

It can be found that although the design structure shown in FIG. 2 realizes fingerprint recognition under the display screen, the fingerprint recognition device and the display screen are required to be firmly connected. The problems caused by this are:

1. The OLED display 220 is very costly and fragile, and it is easy to damage the OLED display 220 during the bonding process of the fingerprint recognition device 230 and the OLED display 220.

2. After the fingerprint recognition device 230 is directly attached to the OLED display 220, it is difficult to replace, and it is easy to damage the OLED display 220 when the fingerprint recognition device 230 is replaced. In other words, since the fingerprint recognition device 230 and the OLED display 220 are completely stuck together, if the fingerprint recognition device 230 is damaged, it is easy to damage the OLED display 220 when the fingerprint recognition device 230 is removed from the lower surface of the OLED display 220.

3. The bonding process of directly bonding the fingerprint recognition device 230 to the lower surface of the OLED display 220 is complicated.

Referring to FIG. 3, in another typical fingerprint recognition device, the lower surface of the protective cover 310 is attached to the upper surface of the display screen 320, and the fingerprint recognition device 330 may be fixedly disposed below the display screen 320. The lower surface of the fingerprint recognition device 330 is soldered and fixed to the flexible circuit board 350. And there is a gap 390 between the fingerprint recognition device 330 and the display screen 320. As an optional implementation manner, the fingerprint identification device 330 may be fixedly connected to a device easily removable inside the terminal device to be installed below the display screen 320, for example, the fingerprint identification device 330 may be installed on the middle frame 370 On the lower surface, the middle frame 370 can serve as a fixing frame between the fingerprint identification device 330 and the display screen 320. The middle frame 370 is disposed between the display screen 320 and the back cover and is used to carry various internal components. The internal components include but are not limited to batteries, motherboards, cameras, cables, various sensors, microphones, earpieces, etc. Other parts. As a result, the fingerprint identification device 330 and the display screen 320 are completely decoupled, and the display screen 320 is prevented from being damaged when the fingerprint identification device 330 is installed or removed.

It can be found that although the design structure shown in FIG. 3 can also realize fingerprint recognition under the display screen, the fingerprint recognition device is fixed below the middle frame of the terminal device, and may need to avoid batteries, motherboards, cameras, cables, and various sensors. , Microphones, earpieces and other components, so that the location of the fingerprint detection area on the screen is limited.

Therefore, in order to solve the above-mentioned problems, the embodiments of the present application provide a fingerprint recognition device, which can solve the problem that the bonding process between the fingerprint recognition device and the display screen is complicated, the bonding cost is high, and the bonding process and maintenance process It is easy to damage the display screen and other problems, and can solve the problem of the limited position of the fingerprint detection area on the screen.

4 is a schematic structural diagram of a fingerprint identification device provided by an embodiment of the present application. When the fingerprint recognition device is applied to an electronic device (for example, a smart phone), as shown in FIG. 4, the lower surface of the protective cover 410 is attached to the upper surface of the display screen 420, and the fingerprint recognition device 430 may be fixedly disposed on the display There is a gap 470 between the lower part of the screen 420 and the middle frame 440 and the display screen 420. In an optional implementation manner, the fingerprint identification device 430 may include an easily detachable structural member, and is fixed between the display screen 420 of the electronic device and the middle frame 440 of the electronic device through the structural member, and the fingerprint identification There is a certain gap between the device 430 and the display screen 420. In another optional implementation manner, the structural component is a middle frame 440 of an electronic device. Specifically, the fingerprint recognition device 430 may be fixed on the upper surface of the middle frame 440. And there is a gap 470 with the display screen 420. The display screen 420 may be the OLED screen 120 shown in FIG. 1, and the fingerprint identification device 430 may be the fingerprint identification device 130 shown in FIG. 1. The middle frame 440 can serve as a fixing frame between the fingerprint identification device 430 and the display screen 420. The middle frame 440 is disposed between the display screen 420 and the back cover 460 and is used to carry a frame for various internal components, such as a battery 450, or may be a main board, a sound cavity, a sub board, a camera, a motor, a cable, and various sensors Components such as microphones, microphones, handsets, SIM card positions, etc. In FIG. 4, the fingerprint recognition device 430 can coincide with the battery 450 in the thickness direction of the electronic device, and the fingerprint detection area can be placed at any position of the display screen 420, for example, the fingerprint recognition area can be 20 to 80 mm away from the lower edge of the display screen 420 . For the specific structure, function, and fingerprint identification process of the display screen 420 and the fingerprint identification device 430, reference may be made to the foregoing description about the OLED display 120 and the fingerprint identification device 130, and details are not described here.

Therefore, the fingerprint recognition device provided by the embodiments of the present application can completely decouple the fingerprint recognition device from the display screen, avoiding the problems of high cost, low efficiency and complicated process caused by poor bonding; at the same time, the fingerprint recognition device It is installed between the display screen and the middle frame, so that there is no need to avoid various parts inside the electronic device. For example, the fingerprint recognition device and the battery can coincide in the thickness direction of the electronic device, so that the placement of the fingerprint recognition device is not Restricted.

The middle frame 440 may be specifically made of metal or alloy material, or even made of plastic material. In this case, the middle frame 440 may even be integrally formed with the frame of the electronic device. The so-called integral molding is the internal middle frame and the frame Is a whole. For example, the frame can be just a metal welt, or a metal-like coating can be applied to the middle frame. Further, the middle frame 440 may also be a composite middle frame. Taking a mobile phone as an example, the middle frame 440 includes an inner middle frame 1 and an outer middle frame 2. The inner middle frame 1 is used to carry mobile phone parts, and the outer middle frame 2 is inside. Outside the middle frame 1, the outer edge of the outer middle frame 2 is provided with a mobile phone button, and the inner middle frame 1 and the outer middle frame 2 are integrated into one body. Because the middle frame of the mobile phone is designed as the inner middle frame and the outer middle frame, the inner and outer middle frames are integrated into a whole. When the mobile phone is impacted, the outer middle frame is worn first. Because there are only buttons on the outer middle frame, it is simple and convenient to replace the outer middle frame. Low cost; furthermore, an elastic material can be provided between the inner and outer middle frames. Since the inner and outer middle frames are relatively fixed under the compression of the elastic layer, the elastic layer can reduce the center The impact of the box.

As a specific implementation, a groove may be extended downward on the upper surface of the middle frame 440, that is, a groove structure is formed in the installation area of the fingerprint identification device 430, so that the fingerprint identification device 430 is at least partially accommodated in the concave Inside the slot. The fingerprint identification device 430 may be fixed in the groove. A possible embodiment is that the fingerprint recognition device 430 may be fixed in the groove through conductive or non-conductive double-sided adhesive. For example, a double-sided tape may be attached to the lower surface of the fingerprint recognition device 430 or the surface of the groove, and a certain pressure may be applied to the upper surface of the fingerprint recognition device 430 to fix the groove with the groove. Another possible embodiment is that the fingerprint identification device 430 can be fixed on the surface of the groove through a special positioning structure, that is, through a mechanical connection. For example, screw mounting and fixing methods, welding and fixing methods, and coupling and fixing methods.

The depth of the groove can be less than or equal to 0.3mm, and the thickness of the middle frame 440 is generally 0.6mm. In order not to affect other performance of the electronic device, try to ensure that the thickness of the thinnest part of the middle frame 440 with groove is greater than or equal to It is equal to 0.2mm. It should be understood that the depth of the groove may be related to the thickness of the middle frame. The various parameter values here are only used for examples and are not specifically limited.

The display screen 420 used in the technical solutions of the embodiments of the present application may be an OLED screen, a soft screen, or a hard screen. The following uses the OLED screen as an example to elaborate in detail. If the fingerprint recognition device 430 is an optical fingerprint recognition device, the fingerprint recognition device 430 needs to detect the reflected light formed by the light signal emitted by the display screen 420 reflected by the finger, and the fingerprint recognition device 430 and the display screen 420 should be kept at least 50 μm Air gap. Under the display screen 420, there can also be a layer of light-shielding layer, screen protection foam, optical glue, flexible circuit board of screen assembly, etc., each layer needs to be opened, so that the fingerprint recognition device 430 is at least partially accommodated in the opening To effectively receive the light transmitted from the display screen 420. Compared with the electronic device, the size of the opening can be less than or equal to 30mm in the horizontal direction of the screen, and less than or equal to 60mm in the vertical direction of the screen, or the size of the opening under the screen can be extended outward relative to the external dimensions of the fingerprint recognition device 0.7～1.5mm. Those skilled in the art understand that each parameter value here is only used for examples and is not specifically limited.

Optionally, a foam with a certain thickness and size retention force can also be attached to the upper surface of the fingerprint recognition device 430, and a sealed environment can be formed between the bottom of the display screen 420 and the fingerprint recognition device 430, so as to achieve shading and prevention Dust requirements. Among them, the foam compression rate may be greater than 50%, and the bonding surface of the foam and the display screen 420 may be non-adhesive or low-adhesive to facilitate rework.

FIG. 5 is a schematic structural diagram of another fingerprint identification device provided by an embodiment of the present application. When the fingerprint recognition device is applied to an electronic device (for example, a smartphone), as shown in FIG. 5, the lower surface of the protective cover 410 is attached to the upper surface of the display screen 420, and the fingerprint recognition device 430 may be fixed to the middle frame 440 Inside the groove set on the upper surface. The fingerprint identification device 430 may be based on the optical path design principle of the collimating hole, and specifically includes: a sensor chip 431 and an optical path modulator 432. For example, the optical path modulator 432 is an array of through holes. Optionally, there is a certain air gap from the upper surface of the optical path modulator 432 to the lower surface of the display screen 420. In an alternative implementation, the optical path modulator 432 in the fingerprint identification device 430 may be directly attached to the display screen 420, and other components in the fingerprint identification device 430 may be fixed in the groove of the middle frame 440. The light emitted from the display screen 420 is reflected on the surface of the finger to be detected above the display screen 420, and the reflected light reflected from the finger surface is collimated and modulated by the optical path modulator 432, and the reflected light is guided to the sensor chip 431 And received, the sensor chip 431 can further detect the received reflected light to realize fingerprint identification.

Optionally, the optical path modulator 432 may adopt a collimator structure. In terms of structure, there are several optical channels on a layer of boards, that is, through-hole arrays, the structure of which can make optical fibers, or others can convert divergent light. The lens structure for collimated light, except the channel is transparent, the wall surface and other areas are coated with shading materials. During use, the reflected light enters the collimator after passing through the cover plate and the display screen. Filter refraction. The scattered light makes the light reaching the sensor chip collimated, so as to obtain a clear image.

Alternatively, the optical path modulator 432 may also adopt a micro lens structure. In use, the reflected light enters the lens after passing through the cover plate and the display screen, and then is focused on the sensor chip to obtain clear imaging.

Optionally, in an embodiment of the present application, as shown in FIG. 5, the fingerprint identification device 430 further includes: an optical filter 433. The optical filter 433 may be disposed between the sensor chip 431 and the optical path modulator 432. It should be understood that, in a specific implementation, the position of the optical filter is not limited to below the optical path modulator 432, and may also be disposed between the optical path modulator 432 and the display screen 420, that is, located at the optical path modulator 432 Above; alternatively, two layers of optical filters 433 may be included, which are disposed above and below the optical path modulator 432, respectively. In other alternative embodiments, the optical filter 433 may also be integrated into the optical path modulator 432, or may even be omitted, which is not limited in this application.

In a possible implementation manner, as shown in FIG. 5, the fingerprint identification device 430 further includes: a bracket 434, which can serve as a connection between the fingerprint identification device 430 and the display screen 420 and/or the middle frame 440 It is used to realize the fixed connection between the three. Optionally, the optical path modulator 432 may be directly fixed on the bracket 434, for example, the side surface of the optical path modulator 432 may be attached to the inner surface of the bracket 432 by fixing glue. Alternatively, the bracket 434 may further include a raised structure, which may be used to place the optical path modulator 432. For example, the optical path modulator 432 may be attached to the upper surface of the convex structure of the bracket 432 through fixing glue. It should be noted that, the bracket 432 may be a plurality of components provided on the outside of the fingerprint recognition device 430, or may be integrally formed.

It should be understood that the optical filter 433 can be used to reduce undesired background light in fingerprint sensing, so as to improve the optical sensing of the received light by the sensor chip 431. The optical filter 433 may be specifically used to filter out the wavelength of ambient light, for example, near infrared light and part of red light. For another example, blue light or part of blue light. For example, human fingers absorb most of the energy of light with a wavelength below 580nm. If one or more optical filters or optical filter coatings can be designed to filter light with a wavelength from 580nm to infrared, the ambient light pair can be greatly reduced The impact of optical detection in fingerprint sensing.

Optionally, the optical filter 433 may be an infrared cut-off optical filter, which may be fixed on the sensor chip 431 by optical adhesive bonding or may be fixed on a bracket 434 to maintain a certain distance from the sensor chip 431, wherein, when When the optical filter 433 is attached to the sensor chip 431, there should be no air bubbles between the sensor chip 431 and the optical filter 433 after curing.

Alternatively, the optical filter 433 may include one or more optical filters, which may be configured as a band-pass filter, for example, to allow the transmission of light emitted by the OLED pixels while blocking the sun Infrared light and other light components in the light. When the fingerprint recognition device 430 is used outdoors, this optical filtering can effectively reduce the background light caused by sunlight. The one or more optical filters may be implemented as, for example, optical filter coatings formed on one or more continuous interfaces, or may be implemented on one or more discrete interfaces. It should be understood that the optical filter 433 may be fabricated on the surface of any optical component, or along the optical path to the reflected light formed by the finger reflection to the sensor chip 431.

Optionally, in an embodiment of the present application, the fingerprint recognition device 430 may further include a circuit board for transmitting signals, as shown in FIG. 5, the circuit board may be a flexible printed circuit board (Flexible Printed Circuit) , FPC) 435.

Alternatively, the sensor chip 431 may be fixed on the upper surface of the flexible printed circuit board 435 through die bonding glue, and electrically connected to the flexible printed circuit board 435 through a gold wire. The sensor chip 431 can also be soldered to the flexible printed circuit board 435 through a pad. Alternatively, the sensor chip 431 may be fixed on the surface of the reinforced steel sheet of the flexible printed circuit board 435 in the above manner to reduce the thickness of the fingerprint recognition device 430, which can better implement the present application Technical solutions. Specifically, the sensor chip 431 can realize electrical interconnection and signal transmission with other peripheral circuits or other elements of the terminal device 100 as shown in FIG. 1 through the flexible printed circuit board 435. For example, the sensor chip 431 can receive the control signal of the processing unit of the terminal device 100 through the flexible printed circuit board 435, and can also detect the fingerprint detection signal through the flexible printed circuit board 435 ( For example, a fingerprint image) is output to the processing unit or control unit of the terminal device 100.

Optionally, as shown in FIG. 5, the bracket 434 can be sealed and adhered by fixing glue on the periphery of the flexible printed circuit board 435, wherein the glue thickness design can be controlled within 0.02 mm to 0.03 mm.

Alternatively, as shown in FIG. 5, the bracket 434 may be hollowed out in the gold wire area to avoid the gold wire, and the gold wire is sealed with a sealant. The sealant needs to completely cover the gold wire after curing. The optical path modulator 432 can be adhered to the bracket 434 by fixing glue on the adhesive groove of the bracket 434, and it is required that the optical path of the opening area of the through-hole array is not blocked after the adhesive is cured.

Wherein, the fixing glue may have at least one of the following characteristics: epoxy system or acrylic system, viscosity ≥ 2000 mPas, curing shrinkage rate <3%, curing method may be low temperature curing within 85°C.

In a possible implementation manner, the fingerprint detection area may include a plurality of small area detection areas, or may be a large area detection area. For example, the fingerprint recognition device 430 may include multiple sensor chips 431, multiple optical path modulators 432, multiple optical filters 433, and so on. Among them, the plurality of sensor chips 431, the plurality of optical path modulators 432, and the plurality of optical filters 433 can correspond one-to-one, and the area of the fingerprint detection area formed by each sensor chip should be greater than 5mm* 8mm, where the size of each sensor chip should be greater than 5.5mm*8.5mm. For another example, the fingerprint identification device 430 may further include only one sensor chip 431, a through-hole array, and an optical filter 433, wherein the area of the fingerprint detection area formed by the sensor chip should be greater than 5mm*30mm, where, The size of the sensor chip should be greater than 5.5mm*30.5mm. When the fingerprint recognition device 430 includes multiple sensor chips, a processing unit may be used for the multiple sensor chips, and the multiple sensor chips may be distributed side by side on the flexible printed circuit board.

It should be noted that, in the embodiment of the present application, the sensor chip 431 corresponds to the photoelectric detection portion 134 described in FIG. 1, and the optical filter 133 and the through-hole array 132 correspond to those described in FIG. 1 For the specific structure, function, and fingerprint detection process of the optical component 132, reference may be made to the foregoing description about the fingerprint recognition device 130 shown in FIG. 1, and details are not described herein again.

It should be understood that in a specific implementation, the packaged fingerprint recognition device 430 may include some or all of the above components. For example, the optical filter 433 and the sensor chip 431 may be packaged together to form the fingerprint recognition device 430, and the optical path modulator 432, The components such as the bracket 434 and the flexible printed circuit board 435 can be installed on the electronic device respectively.

Again, the parameter values exemplified in the above embodiments are not used to limit this application, and can be modified accordingly according to the specific implementation.

FIG. 6 is a schematic diagram of an assembly process 500 of a fingerprint identification device according to an embodiment of the present application. Specifically, the assembly process 500 includes:

S510, passive component placement.

Passive components such as capacitors and MCUs are fixed on the flexible printed circuit board 435.

S520, the sensor chip is attached.

The sensor chip 431 is fixed to the surface of the flexible printed circuit board 435 or the reinforced steel sheet of the flexible printed circuit board 435 by die bonding glue, wherein the surface of the reinforced steel sheet bonded to the flexible printed circuit board can be reduced The thickness of the fingerprint recognition device also electrically connects the passive element to the sensor chip 431.

S530, the optical filter is attached.

The optical filter 433 is fixed on the sensor chip 431 by optical glue, the optical filter 433 can completely cover the sensor chip 431, and there is no air bubble between the sensor chip and the sensor chip after curing, the optical filter 433 can be Infrared cut-off optical filter, effective use wavelength is 475nm ~ 550nm.

S540, sensor chip bonding.

The sensor chip 431 is electrically connected to the flexible printed circuit board 435 through a gold wire, and forms a circuit part with the flexible printed circuit board 435.

S550, the bracket fits.

The bracket 434 is sealed and adhered by fixing glue on the periphery of the flexible printed circuit board 435.

S560, gold thread sealant.

The bracket 434 is hollowed out in the area of the gold wire, and the gold wire is sealed with a sealant. The sealant needs to completely cover the gold wire after curing to improve connection reliability.

S570, the optical path modulator 432 is attached.

The optical path modulator 432 may be in the form of a periodic array of small holes. The optical path modulator 432 is adhered to the bracket by fixing glue on the bracket glue groove. After the adhesive is cured, the optical path of the opening area of the optical path modulator 432 is not blocked.

Wherein, the fixing glue may be an glue belonging to an epoxy system or an acrylic system. The fixing glue has at least one of the following characteristics: impervious to visible light, a thickness of 0.02 mm to 0.10 mm, a viscosity> 20000 mPas, and a curing shrinkage rate <3 %. The curing method of the fixing glue may be low temperature curing within 85°C, ultraviolet curing (Ultraviolet curing), or UV curing combined with low temperature curing within 85°C.

S580, functional test.

At this time, the fingerprint identification device 430 is mainly tested, for example, a fingerprint detection test.

S590, double-sided tape is attached on the surface of the module.

The above-mentioned module is the fingerprint identification device 430. When the test is passed in step 580, double-sided tape is attached to the lower surface of the module, and a certain thickness and size retention force can also be attached to the upper surface of the module Foam, foam compression rate>50%, forming a sealed environment under the display screen 420 and the optical path modulator to meet the requirements of shading and dustproof. The adhesive surface between the foam and the screen can be non-sticky or low-sticky, which is convenient for rework.

S591, the module is attached to the middle frame.

The module is fixed to the middle frame 440 by double-sided adhesive. The area where the module is fixed by the middle frame 440 can have a sink groove, and conductive or non-conductive double-sided tape can be attached to the lower surface of the module or the sink groove. The outline of the module is positioned with the sink of the middle frame 440.

The distance from the lower surface of the display screen 420 to the upper surface of the optical path modulator constitutes the object distance of the fingerprint recognition device 430. Within this distance range, the laminated structure under the screen requires openings to ensure an effective optical path. In the case of hard screens, the laminate under the screen can include foam, double-sided tape, flexible printed circuit boards for screen components, and so on. In addition, batteries, motherboards, cameras, cables, various sensors, microphones, earpieces and other components can be placed on the lower surface of the middle frame 440.

S592, functional test.

At this time, a comprehensive test is performed, that is, a complete machine test. When the test is appropriate, the assembly process is completed.

An embodiment of the present application also provides an electronic device including the fingerprint identification device, the display screen, and the middle frame in the foregoing various embodiments, wherein the fingerprint identification device is located between the display screen and the middle frame, and is There is a gap between the displays.

7 is a schematic block diagram of an electronic device 600 according to an embodiment of the present application. The electronic device 600 shown in FIG. 7 includes: a radio frequency (Radio Frequency) circuit 610, a memory 620, other input devices 630, a display screen 640, a sensor 650, an audio circuit 660, an I/O subsystem 670, a processor 680, And power supply 690 and other components. Those skilled in the art may understand that the structure of the electronic device shown in FIG. 7 does not constitute a limitation on the electronic device, and may include more or less components than shown, or combine some components, or split some components , Or different component arrangements. Those skilled in the art may understand that the display screen 640 belongs to a user interface (User Interface, UI), and the electronic device 600 may include a user interface that is less than that illustrated or less.

The following describes the components of the electronic device 600 in detail with reference to FIG. 7:

The RF circuit 610 can be used for receiving and sending signals during receiving and sending information or during a call. In particular, after receiving the downlink information of the base station, it is processed by the processor 680; in addition, the designed uplink data is sent to the base station. Generally, RF circuits include but are not limited to antennas, at least one amplifier, transceiver, coupler, low noise amplifier (Low Noise Amplifier, LNA), duplexer, and so on. In addition, the RF circuit 610 can also communicate with other devices through a wireless communication network. The memory 620 may be used to store software programs and modules, and the processor 680 executes various functional applications and data processing of the electronic device 600 by running the software programs and modules stored in the memory 620. The memory 620 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, application programs required by at least one function (such as a sound playback function, an image playback function, etc.), etc.; the storage data area may store The data created by the use of the electronic device 600 (such as audio data, phone book, etc.) and the like. In addition, the memory 620 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other volatile solid-state storage devices.

The other input device 630 may be used to receive input numeric or character information, and generate signal input related to user settings and function control of the electronic device 600. Specifically, other input devices 630 may include but are not limited to physical keyboards, function keys (such as volume control buttons, switch buttons, etc.), trackballs, mice, joysticks, and light mice (light mice are touch sensitive that do not display visual output Surface, or an extension of a touch-sensitive surface formed by a screen, etc.). The other input device 630 is connected to the other input device controller 671 of the I/O subsystem 670, and performs signal interaction with the processor 680 under the control of the other device input controller 671.

The display screen 640 may be used to display information input by the user or information provided to the user and various menus of the electronic device 600, and may also accept user input. The specific display screen 640 may be a touch screen, which may include a display panel 641 and a touch panel 642. The touch panel 642 can cover the display panel 641, and the user can according to the content displayed on the display panel 641 (the display content includes but is not limited to, a soft keyboard, a virtual mouse, a virtual key, an icon, etc.) Operate on or near the control panel 642, after detecting the operation on or near it, the touch panel 642 transmits it to the processor 680 through the I/O subsystem 670 to determine the user input, and then the processor 680 passes the I according to the user input The /O subsystem 670 provides corresponding visual output on the display panel 641. Although in FIG. 7, the touch panel 642 and the display panel 641 are implemented as two independent components to implement the input and input functions of the electronic device 600, in some embodiments, the touch panel 642 and the display panel 641 may be The input and output functions of the electronic device 600 are integrated.

The electronic device 600 may further include at least one sensor 650. For example, the sensor 650 may be a fingerprint sensor located under or within the display screen 640, that is, the fingerprint identification device in the embodiment of the present application.

The audio circuit 660, the speaker 661, and the microphone 662 may provide an audio interface between the user and the electronic device 600. The audio circuit 660 can transmit the converted signal of the received audio data to the speaker 661, which converts the speaker 661 into a sound signal for output; on the other hand, the microphone 662 converts the collected sound signal into a signal, which is received by the audio circuit 660 Convert to audio data, and then output the audio data to the RF circuit 610 to send to another mobile phone, for example, or output the audio data to the memory 620 for further processing.

The I/O subsystem 670 is used to control input and output external devices, and may include other device input controllers 671, sensor controllers 672, and display controllers 673. Optionally, one or more other input control device controllers 671 receive signals from other input devices 630 and/or send signals to other input devices 630, which may include physical buttons (press buttons, rocker buttons, etc.) , Dial, slide switch, joystick, click wheel, light mouse (light mouse is a touch sensitive surface that does not display visual output, or an extension of the touch sensitive surface formed by the screen). It is worth noting that the other input control device controller 671 can be connected to any one or more of the above devices. The display controller 673 in the I/O subsystem 670 receives signals from the display screen 640 and/or sends signals to the display screen 640. After the display screen 640 detects the user input, the display controller 673 converts the detected user input into interaction with the user interface object displayed on the display screen 640, that is, realizes human-computer interaction. The sensor controller 672 may receive signals from one or more sensors 660 and/or send signals to one or more sensors 660.

The processor 680 is the control center of the electronic device 600, and uses various interfaces and lines to connect the various parts of the entire electronic device, by running or executing the software programs and/or modules stored in the memory 620, and calling the stored in the memory 620 Data, perform various functions and process data of the electronic device 600, thereby performing overall monitoring on the electronic device. Optionally, the processor 680 may include one or more processing units; preferably, the processor 680 may integrate an application processor and a modem processor, where the application processor mainly processes an operating system, a user interface, and application programs, etc. The modem processor mainly handles wireless communication. It can be understood that the above-mentioned modem processor may not be integrated into the processor 680. The processor 680 may be used to execute various steps in the method embodiments of the present application.

The electronic device 600 further includes a power supply 690 (such as a battery) that supplies power to various components. Preferably, the power supply can be logically connected to the processor 680 through the power management system, so as to realize functions such as managing charging, discharging, and power consumption through the power management system.

Although not shown, the electronic device 600 may further include a camera, a Bluetooth module, etc., which will not be repeated here.

It should be understood that “one embodiment” or “one embodiment” mentioned throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present application. Therefore, “in one embodiment” or “in one embodiment” appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in one or more embodiments in any suitable manner.

Those of ordinary skill in the art may realize that the units and circuits of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application of the technical solution and design constraints. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

In the several embodiments provided in this application, it should be understood that the disclosed circuits, branches, and units may be implemented in other ways. For example, the branch described above is schematic. For example, the division of the unit is only a logical function division. In actual implementation, there may be additional divisions. For example, multiple units or components may be combined or integrated into A branch, or some features can be ignored, or not implemented.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application essentially or part of the contribution to the existing technology or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to enable a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program code .

The above is only the specific implementation of this application, but the scope of protection of this application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application. It should be covered by the scope of protection of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A fingerprint identification device, characterized in that, when the fingerprint identification device is applied to an electronic device, the fingerprint identification device is provided between the display screen of the electronic device and the middle frame of the electronic device, and There is a gap between the display screens.
The fingerprint identification device according to claim 1, wherein the fingerprint identification device is fixed on the upper surface of the middle frame.
The fingerprint identification device according to claim 2, wherein a groove is extended downward on the upper surface of the middle frame, and the fingerprint identification device is fixed in the groove.
The fingerprint identification device according to claim 3, wherein the fingerprint identification device is fixed in the groove by conductive or non-conductive double-sided adhesive.
The fingerprint identification device according to claim 3, wherein the fingerprint identification device is fixed in the groove through a mechanical connection structure.
The fingerprint identification device according to any one of claims 1 to 5, wherein at least one laminate is provided between the upper surface of the fingerprint identification device and the lower part of the display screen, and the at least one laminate With an opening, the fingerprint identification device is at least partially accommodated in the opening to receive light transmitted from the display screen.
The fingerprint identification device according to any one of claims 1 to 6, wherein the at least one laminate includes a foam layer, and the foam layer is attached to the upper surface of the fingerprint identification device.
The fingerprint identification device according to any one of claims 1 to 7, wherein the fingerprint identification device comprises:

Sensor chip

A through-hole array, the through-hole array is disposed above the sensor chip, and is used to direct light transmitted from the display screen to the sensor unit of the sensor chip.
The fingerprint identification device according to claim 8, wherein the sensor chip is fixed on the surface of the flexible printed circuit board or the reinforced steel sheet of the flexible printed circuit board.
The fingerprint identification device according to claim 8 or 9, wherein the fingerprint identification device further comprises:

A bracket for fixing the through-hole array above the sensor chip.
The fingerprint identification device according to claim 10, wherein the fingerprint identification device further comprises:

The optical filter is arranged between the sensor chip and the through-hole array;

The optical filter is attached to the sensor chip, or the optical filter is fixed on the bracket and has a gap with the sensor chip.
The fingerprint identification device according to any one of claims 8 to 11, wherein the fingerprint identification device includes a plurality of sensor chips, and the plurality of sensor chips are distributed side by side on a flexible printed circuit board.
An electronic device, characterized in that the electronic device comprises the fingerprint identification device according to any one of claims 1 to 12, a display screen, and a middle frame, and the middle frame is used to support the display screen.
The electronic device according to claim 13, wherein the display screen is an organic light emitting diode OLED screen.
The electronic device according to claim 13 or 14, wherein the middle frame is a metal or plastic structure.