CN109716351B

CN109716351B - Fingerprint identification device and electronic equipment

Info

Publication number: CN109716351B
Application number: CN201880002612.0A
Authority: CN
Inventors: 熊峰; 郭益平
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2018-12-13
Filing date: 2018-12-13
Publication date: 2021-04-23
Anticipated expiration: 2038-12-13
Also published as: CN112949593A; CN109716351A; WO2020118631A1

Abstract

The embodiment of the application provides a fingerprint identification device and electronic equipment when the fingerprint identification device is applied to electronic equipment, the fingerprint identification device set up in electronic equipment's display screen with between electronic equipment's the center, and with have the clearance between the display screen. The fingerprint identification device and the electronic equipment provided by the embodiment of the application can be completely decoupled with the display screen, so that the problems of high cost, low efficiency, complex process and the like caused by poor fitting are solved; simultaneously with fingerprint identification device setting between display screen and center to need not dodge the inside various spare parts of electronic equipment, for example, this fingerprint identification device can coincide with the battery in electronic equipment's thickness direction, make fingerprint identification device's locating position no longer restricted.

Description

Fingerprint identification device and electronic equipment

Technical Field

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

Background

There are two main types of optical fingerprint recognition schemes under the screen. The first is a periodic micro-hole array based optical modulator scheme, which requires that a fingerprint recognition module is closely attached to a screen (e.g., an Organic Light-Emitting Diode (OLED)). The second is based on the microlens scheme, and this scheme is with fingerprint identification module and screen separation, fixes in electronic equipment's center below.

In the first scheme, the problems of high cost, low efficiency, complex process and the like caused by poor bonding may exist; in the second scheme, the battery space, the sound cavity, the sub-board, the motor, the Subscriber Identity Module (SIM), and the like need to be avoided to meet the requirements of the electronic device.

Disclosure of Invention

In view of this, the embodiment of the present application provides a fingerprint identification apparatus and an electronic device, which can better meet the requirements of the electronic device, and can reduce the cost, improve the efficiency, and have simple assembly.

In a first aspect, a fingerprint identification device is provided, where the fingerprint identification device is applied to an electronic device, the fingerprint identification device is disposed between a display screen of the electronic device and a middle frame of the electronic device, and a gap is formed between the display screen and the middle frame.

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

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

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

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

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

In one possible implementation, at least one laminate is disposed between the upper surface of the fingerprint identification device and the underside of the display screen, the at least one laminate having an aperture, the fingerprint identification device being at least partially received within the aperture to receive light transmitted through the display screen.

The effective light path can be guaranteed to the stromatolite trompil under the screen, also can be so that form good sealed between display screen and the fingerprint identification device simultaneously, avoids the foreign matter pollution to influence the imaging quality.

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

The foam with certain thickness and size retention is attached to the upper surface of the fingerprint identification device, the compression rate of the foam can be more than 50%, and therefore a sealing environment is formed between the lower surface of the display screen and the fingerprint identification device, and the requirements of shading and dust prevention are met.

In one possible implementation, the fingerprint identification apparatus includes: a sensing chip; and the through hole array is arranged above the sensing chip and used for directing the light transmitted by the display screen to the sensing unit of the sensing chip.

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

The thickness of the fingerprint identification device can be effectively reduced by bonding the sensing chip on the surface of the reinforced steel sheet of the flexible printed circuit board.

In a possible implementation manner, the fingerprint identification apparatus further includes: and the bracket is used for fixing the through hole array above the sensing chip.

In a possible implementation manner, the fingerprint identification apparatus further includes: the optical filter is arranged between the sensing chip and the through hole array; the optical filter is attached to the sensing chip, or the optical filter is fixed on the support and has a gap with the sensing chip.

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

The plurality of sensing chips are distributed on the flexible printed circuit board side by side, so that a plurality of fingerprint detection areas can be formed, full-screen fingerprint unlocking can be realized, and user experience can be improved.

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

In one possible implementation, the display screen is an Organic Light Emitting Diode (OLED) screen.

In one possible implementation, the middle frame is a metal or plastic structural member.

The fingerprint identification device is arranged between the display screen and the middle frame, and a gap is reserved between the fingerprint identification device and the display screen, so that the fingerprint identification device and the display screen can be completely decoupled, and the problems of high cost, low efficiency, complex process and the like caused by poor fitting are solved; meanwhile, the fingerprint identification device is arranged between the display screen and the middle frame, various parts in the electronic equipment do not need to be avoided, for example, the fingerprint identification device and the battery can be overlapped in the thickness direction of the electronic equipment, and the placement position of the fingerprint identification device is not limited any more.

These and other aspects of the present application will be more readily apparent from the following description of the embodiments.

Drawings

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

Fig. 2 is a schematic diagram of a typical fingerprint recognition device.

Fig. 3 is a schematic diagram of another exemplary fingerprint recognition device.

Fig. 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.

Fig. 6 is a schematic assembly flow chart of the fingerprint identification device according to the embodiment of the present application.

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

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application shall fall within the scope of the protection of the embodiments in the present application.

According to a common application scenario, the fingerprint identification device provided by the embodiment of the application can be applied to smart phones, tablet computers and other mobile terminals or other terminal devices with display screens; more specifically, in the above terminal device, the fingerprint recognition device may be embodied as an optical fingerprint device, which may be disposed in a partial area or an entire area below the display screen to form an Under-screen (Under-display) optical fingerprint system.

As shown in fig. 1, which is a schematic structural diagram of a terminal device to which the embodiment of the present application is applicable, the terminal device 100 includes a display screen 120 and a fingerprint identification device 130, where the fingerprint identification device 130 is disposed in a local area below the display screen 120. 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 the optical sensing area thereof 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, so that when a user needs to unlock or otherwise verify a fingerprint of the terminal device 100, the user only needs to press a finger on the fingerprint detection area 103 located on the display screen 120, so as to implement 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 surface thereof to set a fingerprint key (such as a Home key).

As a preferred embodiment, the display screen 120 may adopt a display screen having a self-Light Emitting display unit, such as an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. In addition, the display screen 120 may be specifically a touch display screen, which not only can perform image display, but also can detect a touch or pressing operation of a user, 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 be embodied as a touch panel, which may be disposed on a surface of the display screen 120, or may be partially or wholly integrated into the display screen 120, so as to form the touch display screen. Taking an OLED display screen as an example, the fingerprint identification device 130 may use the display unit (i.e., 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 recognition 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 recognition device 130 may be adapted to a non-self-luminous display such as a liquid crystal display or other passive luminous display. Taking an application to a liquid crystal display having a backlight module and a liquid crystal panel as an example, to support the underscreen fingerprint detection of the liquid crystal display, the fingerprint identification device 130 may further include an excitation light source for optical fingerprint detection, where the excitation light source may specifically be an infrared light source or a light source of non-visible light with a specific wavelength, and may be disposed below the backlight module of the liquid crystal display or disposed in an edge area below a protective cover plate of the terminal device 100, and the fingerprint identification device 130 is disposed below the backlight module, and the backlight module allows the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the sensing array of the fingerprint identification device 130 by performing hole opening or other optical designs on film layers such as a diffusion sheet, a brightness enhancement sheet, a reflection sheet, and the like.

Moreover, the sensing array of the fingerprint identification device 130 may be a Photo detector (Photo detector) array, which includes a plurality of Photo detectors distributed in an array, and the Photo detectors may be used as the optical sensing units. When a finger presses the fingerprint detection area 103, 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 ridges and valleys of the fingerprint is different, and the reflected light passes through the display screen 120 and is received by the photodetector array and converted into a corresponding electrical signal, i.e., a fingerprint detection signal; fingerprint image data can be obtained based on the fingerprint detection signal, and fingerprint matching verification can be further performed, so that an optical fingerprint identification function is realized in the terminal device 100.

In other alternative embodiments, the fingerprint recognition device 130 may be disposed in the entire area below the display screen 120, so as to extend the fingerprint detection area 103 to the entire display area 102 of the display screen 120, thereby realizing full-screen fingerprint recognition.

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

As an alternative implementation, as shown in fig. 1, the fingerprint identification device 130 may include a light detection portion 134 and an optical component 132, where the light detection portion 134 includes the sensing array and a reading circuit and other auxiliary circuits electrically connected to the sensing array, which may be fabricated on a chip (Die) through a semiconductor process; that is, the light detecting section 134 may be fabricated in an optical imaging chip or an image sensing chip.

The optical assembly 132 may be disposed over the sensing array of the light detecting portion 134, and the optical assembly 132 may include a Filter layer (Filter), a light guide layer, and other optical elements; the optical filter layer may be used to filter out ambient light that penetrates the finger, and the light guide layer is mainly used to guide (e.g., optically collimate or focus) reflected light that is reflected from the surface of the finger to the sensor array for optical detection.

Light rays emitted by the display screen 120 are reflected on the surface of the finger to be detected above the display screen 120, reflected light reflected from the finger is optically collimated or converged by the micropore array or the lens unit, and is further filtered by the filter layer and then received by the optical detection part 134, and the optical detection part 134 can further detect the received reflected light, so that a fingerprint image of the finger is acquired to realize fingerprint identification.

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

In particular implementations, the optical assembly 132 may be packaged in the same optical fingerprint chip as the light detection portion 134. The optical component 132 may be mounted inside the fingerprint identification device as a separate component from the optical detection portion 134, that is, the optical component 132 may be disposed outside the chip on which the optical detection portion 134 is disposed, for example, the optical component 132 may be attached to the chip, or some components of the optical component 132 may be integrated into the chip. There are various implementations of the light guiding layer of the optical assembly 132.

In an embodiment, the light guiding layer of the optical component 132 is specifically an optical path modulator or an optical path collimator fabricated on a semiconductor silicon wafer or other substrate (such as silicon oxide or nitride), and has a plurality of optical path modulating units or collimating units, specifically, the optical path modulating units or collimating units may be specifically through holes with high aspect ratios, and thus the plurality of collimating units or lens units may constitute a through hole array. In the reflected light reflected from the finger, the light incident on the light path modulation unit or the collimation unit can pass through and be received by the optical sensing units below the light path modulation unit or the collimation unit, each optical sensing unit can basically receive the reflected light of the fingerprint texture guided by the through hole above the optical sensing unit, and therefore 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 of one or more aspheric lenses. The reflected light reflected by the finger is collimated or converged by the optical lens unit and received by the optical sensing unit below the optical lens unit, so that the sensing array can detect the fingerprint image of the finger.

On the other hand, the sensing Array of the light detection portion 134 may specifically include only a single sensing Array, and may also adopt a Dual sensing Array (Dual Array) or a multi sensing Array (Multiple Array) architecture having two or more sensing arrays arranged side by side. When the light detection portion 134 employs a dual-sensor array or a multi-sensor array architecture, the optical assembly 132 may employ a single light guide layer to cover the two or more sensor arrays simultaneously; alternatively, the optical component 132 may also include two or more light guide layers disposed side by side, such as two or more light path modulators or light path collimators, or two or more optical lens layers, respectively, disposed above the two or more sensing arrays for guiding or converging the relevant reflected light to the sensing arrays below the two or more sensing arrays.

In other alternative implementations, the display screen 120 may also be a non-self-luminous display screen, such as a liquid crystal display screen that uses a backlight; in this case, the fingerprint recognition device 130 cannot use the display unit of the display screen 120 as an excitation light source, so that it is necessary to integrate the excitation light source inside the fingerprint recognition device 130 or arrange the excitation light source outside the fingerprint recognition device 130 to realize optical fingerprint detection, and the detection principle is consistent with the above description.

It should be understood that, although the fingerprint identification device is exemplified as an optical fingerprint identification device under a screen in the embodiment shown in fig. 1, in other embodiments, the fingerprint identification device of the terminal device 100 may be replaced by an ultrasonic fingerprint identification device or other types of fingerprint identification devices. The application does not make special restrictions on the type and specific structure of the fingerprint identification device, as long as the fingerprint identification device can meet the performance requirements for fingerprint identification inside the display screen of the terminal equipment.

Referring to fig. 2, in a typical fingerprint identification device, the lower surface of the protective cover 210 is attached to the upper surface of the OLED display 220, the fingerprint identification device 230 is attached to the lower surface of the OLED display 220 by glue 240 in a dispensing manner, and the lower surface of the fingerprint identification device 230 is welded to the flexible circuit board 250. Specifically, the adhesive material 240 may be formed on an outer sidewall of the fingerprint identification device 230, so that the outer sidewall of the fingerprint identification device 230 and the lower surface of the OLED display 220 are completely attached and fixed. In addition, the edge of the lower surface of the OLED display screen 220 is attached to the upper surface of the middle frame 270 through the foam adhesive 260, the middle frame 270 has a groove structure in the area where the fingerprint identification device 230 is located, and the groove structure can be used for providing an avoiding space for the fingerprint identification device 230 and the flexible circuit board 250 below the fingerprint identification device 230. In addition, a battery 280 may be disposed between the middle frame 270 and the rear cover 290.

It can be seen that although the design 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, which results in the following problems:

the OLED display 220 is costly and fragile, and the OLED display 220 is easily damaged during the attaching process of the fingerprint recognition device 230 to the OLED display 220.

2. The fingerprint identification device 230 is difficult to replace after being directly attached to the OLED display screen 220, and the OLED display screen 220 is easily damaged when the fingerprint identification device 230 is replaced. That is, since the fingerprint recognition device 230 and the OLED display 220 are completely adhered together, if the fingerprint recognition device 230 is damaged, the OLED display 220 is easily damaged when the fingerprint recognition device 230 is detached from the lower surface of the OLED display 220.

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

Referring to fig. 3, in another typical fingerprint identification device, the lower surface of the protective cover 310 is attached to the upper surface of the display screen 320, the fingerprint identification device 330 may be fixedly disposed below the display screen 320, and the lower surface of the fingerprint identification device 330 is welded to the flexible circuit board 350. And a gap 390 exists between the fingerprint recognition device 330 and the display screen 320. As an alternative implementation manner, the fingerprint identification device 330 may be installed below the display screen 320 by being fixedly connected to an easily detachable device inside the terminal device, for example, the fingerprint identification device 330 may be installed on the lower surface of the middle frame 370, and the upper surface of the middle frame 370 may be attached to the edge portion of the lower surface of the display screen 320 through a foam back adhesive 360. The middle frame 370 may serve as a mounting frame between the fingerprint recognition device 330 and the display screen 320. The middle frame 370 is disposed between the display screen 320 and the rear cover and is used for supporting a frame of various internal components, including but not limited to a battery, a main board, a camera, a cable, various sensors, a microphone, an earphone, and other components. Thus, the fingerprint recognition device 330 and the display screen 320 are completely decoupled, and damage to the display screen 320 when the fingerprint recognition device 330 is mounted or dismounted is avoided.

It can be found that although the design structure shown in fig. 3 can also realize fingerprint identification under the display screen, the fingerprint identification device is fixed under the middle frame of the terminal device, and may need to avoid the battery, the main board, the camera, the flat cable, various sensors, the microphone, the receiver and other parts, so that the position of the fingerprint detection area in the screen is limited.

Therefore, in order to solve the various problems, an embodiment of the present application provides a fingerprint identification device, which can solve the problems that the attachment process of the fingerprint identification device and the display screen is complex, the attachment cost is high, the display screen is easily damaged in the attachment process and the maintenance process, and the like, and can also solve the problem that the position of the fingerprint detection area in the screen is limited.

Fig. 4 is a schematic structural diagram of a fingerprint identification device according to an embodiment of the present application. When the fingerprint identification device is applied to an electronic device (e.g., 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 identification device 430 may be fixedly disposed between the lower side of the display screen 420 and the middle frame 440, and has a gap 470 with the display screen 420. In an alternative implementation, the fingerprint recognition device 430 may include a 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 a gap is formed between the fingerprint recognition device 430 and the display screen 420. In another alternative implementation, the structure is a bezel 440 of an electronic device. Specifically, the fingerprint recognition device 430 may be fixed to an upper surface of the middle frame 440. And has a gap 470 with the display screen 420. Wherein the display screen 420 may be the OLED screen 120 shown in fig. 1, and the fingerprint recognition device 430 may be the fingerprint recognition device 130 shown in fig. 1. The middle frame 440 can serve as a mount between the fingerprint recognition device 430 and the display 420. The middle frame 440 is disposed between the display screen 420 and the rear cover 460 and is used for supporting the internal frame of various components, such as the battery 450, or may also be a main board, an audio cavity, a sub-board, a camera, a motor, a cable, various sensors, a microphone, an earpiece, a SIM card, and other components. In fig. 4, the fingerprint identification device 430 may be overlapped with the battery 450 in the thickness direction of the electronic device, and the fingerprint detection area may be disposed at any position of the display screen 420, for example, the fingerprint identification area may be 20-80 mm away from the lower edge of the display screen 420. The detailed structure, function and fingerprint identification process of the display screen 420 and the fingerprint identification device 430 can refer to the above description of the OLED display screen 120 and the fingerprint identification device 130, and will not be described herein again.

Therefore, the fingerprint identification device provided by the embodiment of the application can be completely decoupled with the display screen, and the problems of high cost, low efficiency, complex process and the like caused by poor fitting are solved; simultaneously with fingerprint identification device setting between display screen and center to need not dodge the inside various spare parts of electronic equipment, for example, this fingerprint identification device can coincide with the battery in electronic equipment's thickness direction, make fingerprint identification device's locating position no longer restricted.

The middle frame 440 may be made of metal or alloy material, or even plastic material, in which case the middle frame 440 may even be integrally formed with the frame of the electronic device, i.e. the inner middle frame and the frame are an integral whole. For example, the frame may be a metal border only, or a metal-like coating may 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 for bearing parts of the mobile phone, the outer middle frame 2 is outside the inner middle frame 1, the outer edge of the outer middle frame 2 is provided with a mobile phone key, and the inner middle frame 1 and the outer middle frame 2 are integrated into a whole. Because the mobile phone middle frame is designed into the inner middle frame and the outer middle frame, and the inner middle frame and the outer middle frame are integrated into a whole, when the mobile phone is impacted, firstly the outer middle frame is worn, and because only the keys are arranged on the outer middle frame, the outer middle frame is simple and convenient to replace, and the cost is low; furthermore, an elastic material can be arranged between the inner and outer middle frames, and the inner and outer middle frames are relatively fixed under the compression of the elastic force of the elastic layer, so that the impact of the elastic layer on the inner and outer middle frames can be reduced when the outer middle frame bears the impact force.

As a specific implementation manner, a groove may be extended downward from the upper surface of the middle frame 440, that is, a groove structure is formed in the mounting area of the fingerprint identification device 430, so that the fingerprint identification device 430 is at least partially accommodated in the groove. The fingerprint recognition device 430 may be fixed in the recess. One possible embodiment is: the fingerprint recognition device 430 may be fixed in the groove by a conductive or non-conductive double-sided tape. For example, a double-sided tape may be attached to the lower surface or the surface of the groove of the fingerprint recognition device 430, and a certain pressure may be applied to the upper surface of the fingerprint recognition device 430 to fixedly adhere the same to the groove. Another possible embodiment is: the fingerprint recognition device 430 may be fixed to the surface of the groove by a dedicated positioning structure, i.e., by a mechanical connection. For example, a screw fixing method, a welding fixing method, a coupling fixing method, and the like.

The depth of the groove may be less than or equal to 0.3mm, the thickness of the middle frame 440 is generally 0.6mm, and in order not to affect other performances of the electronic device, the thickness of the thinnest portion of the middle frame 440 with the groove is guaranteed to be greater than or equal to 0.2 mm.

The display screen 420 used in the technical solution of the embodiment of the present application may be an OLED screen, a soft screen, or a hard screen, and the OLED screen is taken as an example to be described in detail below. If the fingerprint recognition device 430 is an optical fingerprint recognition device, the fingerprint recognition device 430 needs to detect the reflected light of the light signal emitted from the display screen 420 by the reflection of the finger, and an air gap of at least 50 μm should be maintained between the fingerprint recognition device 430 and the display screen 420. There may also be a layer of light-shielding layer, screen protection foam, optical glue, screen assembly flexible circuit board, etc. laminated under the display screen 420, and each laminated layer needs to be perforated so that the fingerprint recognition device 430 is at least partially accommodated in the perforation to effectively receive the light transmitted from the display screen 420. The size of the opening is less than or equal to 30mm along the transverse direction of the screen and less than or equal to 60mm along the longitudinal direction of the screen, or the size of the opening of the lower screen lamination can extend 0.7-1.5 mm outwards relative to the external size of the fingerprint identification device. Those skilled in the art will appreciate that the values of the various parameters herein are also exemplary only and not intended to be limiting.

Optionally, foam with a certain thickness and size retention can be attached to the upper surface of the fingerprint identification device 430, and a closed environment can be formed between the lower side of the display screen 420 and the fingerprint identification device 430, so that the requirements of light shielding and dust prevention can be met. Wherein, the foam compression ratio can be more than 50%, and the foam can have no stickness or low stickness with the bonding face of display screen 420 to rework.

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

Alternatively, the optical path modulator 432 may adopt a collimator structure, and structurally speaking, a layer plate has a plurality of optical channels, that is, a through hole array, and the structure thereof may be such that an optical fiber or other lens structures capable of converting divergent light into collimated light are provided. And scattering light, so that the light reaching the sensing chip is collimated light, and clear imaging is obtained.

Alternatively, the optical path modulator 432 may also adopt a micro-lens structure, and when in use, the reflected light enters the lens after passing through the cover plate and the display screen, and then is focused on the sensing chip, so as to obtain a clear image.

Optionally, in an embodiment of the present application, as shown in fig. 5, the fingerprint identification device 430 further includes: the optical filter 433. The optical filter 433 may be disposed between the sensing chip 431 and the optical path modulator 432. It should be understood that, in practical implementation, the position of the optical filter is not limited to be below the optical path modulator 432, and may also be disposed between the optical path modulator 432 and the display screen 420, i.e. above the optical path modulator 432; 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 be integrated into the optical path modulator 432, or may even be omitted, which is not limited in this application.

In one possible implementation, as shown in fig. 5, the fingerprint recognition device 430 further includes: a bracket 434, the bracket 434 may serve as a connector between the fingerprint recognition device 430 and the display 420 and/or the middle frame 440, for realizing a fixed connection between the three. Alternatively, the optical path modulator 432 may be directly fixed to the support 434, for example, a side surface of the optical path modulator 432 may be attached to an inner side surface of the support 432 by fixing glue. Alternatively, the support 434 may also include a raised structure that may be used to position the optical path modulator 432. For example, the optical path modulator 432 may be attached to the upper surface of the protruding structure of the support 432 by fixing glue. The holder 432 may be a plurality of separate members provided outside the fingerprint recognition device 430, or may be integrally formed.

It should be appreciated that the optical filter 433 may be used to reduce unwanted background light in fingerprint sensing to improve the optical sensing of the received light by the sensor chip 431. The optical filter 433 may be specifically configured to filter out ambient light wavelengths, such as near infrared light and a portion of red light. Also for example, blue light or part of blue light. For example, a human finger absorbs most of the energy of light with wavelengths below 580nm, and the effect of ambient light on optical detection in fingerprint sensing can be greatly reduced if one or more optical filters or optical filter coatings can be designed to filter light with wavelengths from 580nm to infrared.

Optionally, the optical filter 433 may be an infrared cut-off optical filter, and may be fixed to the sensing chip 431 by attaching an optical adhesive or may be fixed to the bracket 434 to keep a certain distance from the sensing chip 431, wherein when the optical filter 433 is attached to the sensing chip 431, it is required that there is no bubble between the sensing 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, for example, a band pass filter, to allow transmission of light emitted by the OLED pixel while blocking other light components such as infrared light in sunlight. Such optical filtering may effectively reduce background light caused by sunlight when the fingerprint recognition device 430 is used outdoors. The one or more optical filters may be implemented, for example, as optical filter coatings formed on one or more continuous interfaces, or may be implemented as 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 sensor chip 431 via reflected light from the finger.

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, and the Circuit board may be a Flexible Printed Circuit (FPC) 435.

Optionally, the sensing chip 431 may be fixed on the upper surface of the flexible printed circuit board 435 by a die attach adhesive, and electrically connected to the flexible printed circuit board 435 by a gold wire. The sensor chip 431 may also be soldered to the flexible printed circuit board 435 via a solder pad. Alternatively, the sensing chip 431 may be fixed on the surface of the reinforced steel sheet of the flexible printed circuit 435 in the above manner, so as to reduce the thickness of the fingerprint identification device 430, and thus, the technical solution of the present application can be better implemented. Specifically, the sensing chip 431 may realize electrical interconnection and signal transmission with other peripheral circuits or other elements of the terminal device 100 shown in fig. 1 through the flexible printed circuit board 435. For example, the sensing chip 431 may receive a control signal of a processing unit of the terminal device 100 through the flexible printed circuit board 435, and may also output the fingerprint detection signal (e.g., a fingerprint image) to the processing unit or the control unit of the terminal device 100 through the flexible printed circuit board 435.

Alternatively, as shown in fig. 5, the bracket 434 may be sealed and bonded by fixing glue at the periphery of the flexible printed circuit board 435, wherein the glue thickness may be controlled to be 0.02mm to 0.03 mm.

Alternatively, as shown in fig. 5, the bracket 434 may be hollowed out in the gold wire region, and the gold wire may be sealed by a sealant. The sealant requires that the gold wire be completely covered after curing. The light path modulator 432 may be bonded to the bracket 434 by spot-fixing glue on the glue groove of the bracket 434, and the light path of the open area of the through hole array is not blocked after the glue is cured.

Wherein the fixing glue may have at least one of the following characteristics: the viscosity of the epoxy system or the acrylic acid system is more than or equal to 2000mPas, the curing shrinkage is less than 3 percent, and the curing mode can be low-temperature curing within 85 ℃.

In one possible implementation, the fingerprint detection area may include a plurality of small-area detection areas, or may be one large-area detection area. For example, the fingerprint recognition device 430 may include a plurality of sensing chips 431, a plurality of optical path modulators 432, a plurality of optical filters 433, and the like. The plurality of sensing chips 431, the plurality of optical path modulators 432 and the plurality of optical filters 433 may correspond to one another, and an area of a fingerprint detection area formed by each sensing chip should be greater than 5mm by 8mm, wherein a size of each sensing chip should be greater than 5.5mm by 8.5 mm. For another example, the fingerprint recognition device 430 may further include only one sensor chip 431, one through hole array and one optical filter 433, wherein the area of the fingerprint detection area formed by the sensor chip should be greater than 5mm by 30mm, and wherein the size of the sensor chip should be greater than 5.5mm by 30.5 mm. When the fingerprint recognition device 430 includes a plurality of sensor chips, the plurality of sensor chips may use one processing unit, and the plurality of 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 sensing chip 431 corresponds to the photodetection portion 134 described in fig. 1, and the optical filter 133 and the through hole array 132 correspond to the optical component 132 described in fig. 1, and the specific structure, function and fingerprint detection process thereof may refer to the foregoing description of the fingerprint identification device 130 shown in fig. 1, and are not described herein again.

It should be understood that in an implementation, the packaged fingerprint identification device 430 may include some or all of the above components, for example, the optical filter 433 and the sensing chip 431 may be packaged together to form the fingerprint identification device 430, and the optical path modulator 432, the bracket 434, and the flexible printed circuit board 435 may be mounted on the electronic device respectively.

Again, the parameter values illustrated in the above embodiments are not intended to limit the present application, and may be modified according to the specific implementation.

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

and S510, passive element pasting.

Passive components such as a capacitor, an MCU, and the like are fixed to the flexible printed circuit board 435.

And S520, attaching the sensing chip.

The sensing chip 431 is fixed on the surface of the flexible printed circuit board 435 or the surface of the reinforcing steel sheet of the flexible printed circuit board 435 through die attach adhesive, wherein the thickness of the fingerprint identification device can be reduced by bonding the sensing chip 431 on the surface of the reinforcing steel sheet of the flexible printed circuit board, and meanwhile, the passive element is electrically connected with the sensing chip 431.

And S530, attaching the optical filter.

The optical filter 433 is fixed on the sensing chip 431 through optical cement, the optical filter 433 can completely cover the sensing chip 431 and is required to be free of air bubbles between the cured optical filter 433 and the sensing chip, the optical filter 433 can be an infrared cut-off optical filter, and the effective use wavelength is 475 nm-550 nm.

And S540, bonding the sensing chip.

The sensor chip 431 is electrically connected to the flexible printed circuit board 435 by gold wires, and constitutes a circuit portion with the flexible printed circuit board 435.

And S550, attaching the bracket.

The bracket 434 is sealed by applying glue to the periphery of the flexible printed circuit board 435.

S560, sealing the gold thread.

The bracket 434 is drilled and cleared in the gold thread area, the gold thread is sealed by sealant, and the sealant is required to completely cover the gold thread after curing so as to improve the connection reliability.

S570, the optical path modulator 432 is attached.

The optical path modulator 432 may be in the form of a periodic small hole array, and the optical path modulator 432 is bonded to the support by spot-fixing glue on the support glue groove, so that the light path of the open hole area of the optical path modulator 432 is not blocked after the glue is cured.

Wherein, the fixing glue can be a glue belonging to an epoxy system or an acrylic system, and the fixing glue has at least one of the following characteristics: the coating is opaque to visible light, the thickness is 0.02 mm-0.10 mm, the viscosity is more than 20000mPas, and the curing shrinkage is less than 3%. The curing mode of the fixing glue can be low-temperature curing within 85 ℃, or Ultraviolet curing (UV) curing, or UV curing combined with low-temperature curing within 85 ℃.

And S580, testing functions.

At this time, mainly the test of the fingerprint recognition device 430, for example, a fingerprint detection test, is performed.

S590, pasting a double-sided adhesive tape on the surface of the module.

The above module is the fingerprint identification device 430, when the test in step 580 is qualified, double faced adhesive tape is pasted on the lower surface of the module, foam with certain thickness and size retention force can be also pasted on the upper surface of the module, the compression ratio of the foam is more than 50%, a sealed environment is formed between the lower part of the display screen 420 and the light path modulator, and the requirements of shading and dust prevention are met. Wherein the foam and the bonding surface under the screen can have no viscosity or low viscosity, and the reworking is convenient.

And S591, attaching a middle frame to the module.

The module is fixed with the middle frame 440 through the double-sided adhesive tape, a sunken groove can be formed in the area of the middle frame 440 where the module is fixed, the conductive or non-conductive double-sided adhesive tape can be attached to the lower surface or the sunken groove of the module, and the module is positioned through the outline of the module and the sunken groove 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, and within this distance range, the laminated structure under the screen needs to be perforated to ensure an effective optical path. The screen may include a hard screen, a double sided tape, a screen assembly, a flexible printed circuit board, and the like. And the lower surface of the middle frame 440 can be provided with a battery, a main board, a camera, a flat cable, various sensors, a microphone, a receiver and other parts.

And S592, functional testing.

At this time, the overall test, namely the complete machine test, is carried out, and when the test is proper, the assembly process is completed.

The embodiment of the application also provides electronic equipment, which comprises the fingerprint identification device, the display screen and the middle frame in the various embodiments, wherein the fingerprint identification device is positioned between the display screen and the middle frame, and a gap is formed between the fingerprint identification device and the display screen.

Fig. 7 is a schematic block diagram of an electronic device 600 provided according to an embodiment of the application. The electronic device 600 shown in fig. 7 includes: radio Frequency (RF) circuitry 610, memory 620, other input devices 630, display screen 640, sensors 650, audio circuitry 660, I/O subsystem 670, processor 680, and power supply 690. Those skilled in the art will appreciate that the electronic device configuration shown in fig. 7 does not constitute a limitation of the electronic device and may include more or fewer components than shown, or some components may be combined, or some components may be split, or a different arrangement of components. Those skilled in the art will appreciate that the display screen 640 is part of a User Interface (UI) and that the electronic device 600 may include fewer than or the same User interfaces as illustrated.

The following describes each component of the electronic device 600 in detail with reference to fig. 7:

the RF circuit 610 may be used for receiving and transmitting signals during information transmission and reception or during a call, and in particular, receives downlink information of a base station and then processes the received downlink information to the processor 680; in addition, the data for designing uplink is transmitted to the base station. Typically, the RF circuitry includes, but is not limited to, an antenna, at least one Amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, the RF circuitry 610 may also communicate with networks and other devices via wireless communications. The memory 620 may be used to store software programs and modules, and the processor 680 may execute various functional applications and data processing of the electronic device 600 by operating 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, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the electronic device 600, and the like. Further, the memory 620 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

Other input devices 630 may be used to receive entered numeric or character information and generate signal inputs related to user settings and function control of electronic device 600. In particular, other input devices 630 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, a light mouse (a light mouse is a touch-sensitive surface that does not display visual output, or is an extension of a touch-sensitive surface formed by a screen), and the like. The other input devices 630 are coupled to other input device controllers 671 of the I/O subsystem 670 and signal interface with the processor 680 under the control of the other device input controllers 671.

The display screen 640 may be used to display information input by or provided to the user as well as various menus of the electronic device 600 and may also accept user input. The display screen 640 may be a touch screen, and may include a display panel 641 and a touch panel 642. The touch panel 642 may overlay the display panel 641, a user may operate on or near the touch panel 642 overlaid on the display panel 641 according to content displayed on the display panel 641 (the display content including, but not limited to, a soft keyboard, a virtual mouse, virtual keys, icons, etc.), and upon detecting an operation on or near the touch panel 642, the touch panel 642 may be transmitted to the processor 680 via the I/O subsystem 670 to determine a user input, and the processor 680 may then provide a corresponding visual output on the display panel 641 via the I/O subsystem 670 according to the user input. Although in fig. 7, the touch panel 642 and the display panel 641 are two separate components to implement the input and output functions of the electronic device 600, in some embodiments, the touch panel 642 and the display panel 641 may be integrated to implement the input and output functions of the electronic device 600.

The electronic device 600 may further include at least one sensor 650, for example, the sensor 650 may be a fingerprint sensor located under the display screen 640 or inside the display screen 640, i.e., a fingerprint recognition device in the embodiment of the present application.

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

The I/O subsystem 670 may control input and output of external devices, including other device input controllers 671, sensor controllers 672, and display controller 673. Optionally, one or more other input control device controllers 671 receive signals from and/or transmit signals to other input devices 630, and other input devices 630 may include physical buttons (push buttons, rocker buttons, etc.), dials, slide switches, joysticks, click wheels, light mice (a light mouse is a touch-sensitive surface that does not display visual output, or is an extension of a touch-sensitive surface formed by a screen). It is noted that other input control device controllers 671 may be connected to any one or more of the above-described devices. A 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, i.e., human-computer interaction is achieved. The sensor controller 672 may receive signals from the one or more sensors 660 and/or send signals to the one or more sensors 660.

The processor 680 is a control center of the electronic device 600, connects various parts of the entire electronic device using various interfaces and lines, and performs various functions of the electronic device 600 and processes data by operating or executing software programs and/or modules stored in the memory 620 and calling data stored in the memory 620, thereby monitoring the electronic device as a whole. Optionally, processor 680 may include one or more processing units; preferably, the processor 680 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into processor 680. The processor 680 may be configured to perform various steps in the method embodiments of the present application.

The electronic device 600 also includes a power supply 690 (e.g., a battery) for powering the various components, which may be logically coupled to the processor 680 via a power management system that may be configured to manage charging, discharging, and power consumption.

Although not shown, the electronic device 600 may further include a camera, a bluetooth module, and the like, which are not described in detail herein.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

Those of ordinary skill in the art will appreciate that the various illustrative elements and circuits described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the several embodiments provided in the present application, it should be understood that the disclosed circuits, branches and units may be implemented in other manners. For example, the above-described branch is illustrative, and for example, the division of the unit is only one logical function division, and there may be other division ways in actual implementation, for example, multiple units or components may be combined or integrated into one branch, or some features may be omitted, or not executed.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

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

Claims

1. When the fingerprint identification device is applied to electronic equipment, the fingerprint identification device is arranged between a display screen of the electronic equipment and a middle frame of the electronic equipment, and a gap is formed between the fingerprint identification device and the display screen;

the fingerprint identification device is fixed on the upper surface of the middle frame;

a groove is formed in the upper surface of the middle frame in a downward extending mode, the fingerprint identification device is fixed in the groove, so that the fingerprint identification device is at least partially accommodated in the groove, and the middle frame is a frame which is arranged between a display screen and a rear cover of the electronic equipment and used for bearing internal components of the electronic equipment;

the fingerprint identification device comprises a sensing chip and a circuit board used for outputting fingerprint detection signals, wherein the circuit board is a flexible printed circuit board, and the sensing chip is fixed on the surface of a reinforced steel sheet of the flexible printed circuit board and is connected to the flexible printed circuit board through a gold thread;

at least one laminated layer is arranged below the display screen, the at least one laminated layer is provided with an opening to receive light transmitted by the display screen, and the light transmitted by the display screen is reflected light formed by reflecting light rays emitted by a display unit in a fingerprint detection area of the display screen on a finger above the display screen;

the upper surface of the fingerprint identification device is also attached with foam with specific thickness and size retention force, so that a closed environment is formed between the lower part of the display screen and the fingerprint identification device.

2. The fingerprint recognition device of claim 1, wherein the fingerprint recognition device is secured within the recess by a conductive or non-conductive double sided tape.

3. The fingerprint recognition device of claim 1, wherein the fingerprint recognition device is secured within the recess by a mechanical connection.

4. The fingerprint recognition device according to any one of claims 1 to 3, further comprising:

and the through hole array is arranged above the sensing chip and used for directing the light transmitted by the display screen to the sensing unit of the sensing chip.

5. The fingerprint recognition device according to claim 4, further comprising:

and the bracket is used for fixing the through hole array above the sensing chip.

6. The fingerprint recognition device according to claim 5, further comprising:

the optical filter is arranged between the sensing chip and the through hole array;

the optical filter is attached to the sensing chip, or the optical filter is fixed on the support and has a gap with the sensing chip.

7. An electronic device, characterized in that the electronic device comprises the fingerprint recognition device of any one of claims 1 to 6, a display screen, and a middle frame for supporting the display screen.

8. The electronic device of claim 7, wherein the display screen is an Organic Light Emitting Diode (OLED) screen.

9. The electronic device of claim 7 or 8, wherein the middle frame is a metal or plastic structure.