CN111837127A - Fingerprint identification device and electronic equipment - Google Patents
Fingerprint identification device and electronic equipment Download PDFInfo
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- CN111837127A CN111837127A CN202080001547.7A CN202080001547A CN111837127A CN 111837127 A CN111837127 A CN 111837127A CN 202080001547 A CN202080001547 A CN 202080001547A CN 111837127 A CN111837127 A CN 111837127A
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- G—PHYSICS
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- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- Optics & Photonics (AREA)
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Abstract
Provided are a fingerprint identification device and an electronic device, wherein the fingerprint identification device is applied to the electronic device with a Liquid Crystal Display (LCD) screen, and comprises: the prism is arranged on the side wall of the middle frame of the electronic equipment and used for reflecting or refracting a first optical signal emitted by a light source and irradiating the first optical signal to a human finger above the LCD screen; the fingerprint identification module is used for setting up the below of LCD screen, the fingerprint identification module is used for receiving the second light signal in order to acquire the fingerprint image of human finger, the second light signal is follow in the first light signal human finger returns and passes the light signal of LCD screen.
Description
Technical Field
Embodiments of the present invention relate to the field of off-screen fingerprint identification, and more particularly, to a fingerprint identification apparatus and an electronic device.
Background
At present, the identification of the fingerprint under the screen is mainly applied to an Organic Light-emitting diode (OLED) screen, and the principle is as follows: the lower fingerprint identification module of the OLED screen utilizes the light transmission characteristic of the OLED screen to receive reflected light detection fingerprints formed after the reflected light is reflected by fingers and sent by the OLED screen.
However, since the light emitting principle and the specific structure of a Liquid Crystal Display (LCD) screen are different from those of an OLED screen, the fingerprint identification scheme under the OLED screen is not suitable for the LCD screen.
Therefore, how to realize optical fingerprint identification under an LCD screen is a technical problem which needs to be solved urgently in the field.
Disclosure of Invention
Provided are a fingerprint identification device and an electronic device, which can realize optical fingerprint identification under an LCD screen.
In a first aspect, a fingerprint identification device is provided, which is applied to an electronic device having a liquid crystal display LCD screen, and includes:
the prism is arranged on the side wall of the middle frame of the electronic equipment and used for reflecting or refracting a first optical signal emitted by a light source and irradiating the first optical signal to a human finger above the LCD screen;
the fingerprint identification module is used for setting up the below of LCD screen, the fingerprint identification module is used for receiving the second light signal in order to acquire the fingerprint image of human finger, the second light signal is follow in the first light signal human finger returns and passes the light signal of LCD screen.
In some possible implementations, a slot is provided on a side wall of the middle frame, and the prism is fixed in the slot.
In some possible implementations, the slot is disposed on a side wall of the middle frame of the electronic device near the short side.
In some possible implementations, the prism is fixed in the slot by glue or injection molding.
In some possible implementations, the light source is fixed on a sidewall of a screen flexible circuit board FPC of the LCD screen, the sidewall of the screen FPC and a sidewall of the middle frame being opposite to each other so that the first optical signal emitted by the light source is incident to the prism.
In some possible implementations, the light source is fixed on the sidewall of the screen FPC by soldering or conductive adhesive.
In some possible implementations, the light source and the prism are arranged oppositely and staggeredly, so that the first light signal is reflected or refracted by the prism and then irradiates a human finger above the LCD screen.
In some possible implementation manners, a support is disposed on a side wall of the middle frame, the prism is disposed on the support, the light source is disposed below the support, and the support is a light-transmitting structure, so that the first light signal is refracted or reflected by the prism and then irradiated to the human finger.
In some possible implementations, a substrate is disposed on an inner bottom surface of the middle frame below the bracket, and the light source is fixed on the substrate.
In some possible implementations, the substrate is fixed on the inner bottom surface of the middle frame by glue, solid glue, foam or soldering.
In some possible implementations, the bracket is disposed on a side wall of the middle frame of the electronic device near the short side.
In some possible implementation manners, the fingerprint identification module is fixed below the middle frame, wherein the middle frame is fixed with the area opening of the fingerprint identification module and the area opening of the reinforcing rigid plate in the backlight module of the LCD screen corresponding to the upper side of the fingerprint identification module, so that the second optical signal is incident to the fingerprint identification module.
In some possible implementations, the fingerprint identification module is fixed below the middle frame through optical cement or foam.
In some possible implementation manners, the fingerprint identification module is fixed below a reinforcing rigid plate in a backlight module of the LCD screen, wherein an opening is formed in a region of the reinforcing rigid plate corresponding to the upper side of the fingerprint identification module, so that the second optical signal is incident on the fingerprint identification module.
In some possible implementations, the fingerprint identification module is fixed below the stiffening plate by optical cement or foam.
In some possible implementation manners, the fingerprint identification module is fixed on the upper surface of the middle frame and located below a reinforcing rigid plate in the backlight module of the LCD screen, wherein an opening is formed in a region of the reinforcing rigid plate in the backlight module of the LCD screen corresponding to the upper side of the fingerprint identification module, so that the second optical signal is incident on the fingerprint identification module.
In some possible implementation manners, a groove is formed in the upper surface of the middle frame, and the fingerprint identification module is arranged in the groove.
In some possible implementations, the fingerprint identification module is fixed in the groove by optical cement or foam.
In some possible implementations, a horizontal distance between the fingerprint identification module and the short side of the electronic device is within 50 nm.
In some possible implementations, a vertical distance between the fingerprint identification module and a light emitting layer substrate of an LCD screen of the electronic device is between 150nm and 200 nm.
In some possible implementations, the prism is a triangular prism or a trapezoidal prism.
In some possible implementations, the fingerprint identification module includes:
at least one fingerprint sensor comprising a plurality of sensor pixels for receiving the infrared light signal to be returned from the human finger to acquire a fingerprint image of the human finger;
an optical component disposed above the plurality of sensor pixels for guiding the infrared light signal returned from the human finger to the plurality of sensor pixels for optical fingerprint detection.
In a second aspect, an electronic device is provided, comprising:
a Liquid Crystal Display (LCD) screen; and
the first aspect and any possible implementation manner of the first aspect, wherein the fingerprint identification device is disposed below the LCD screen.
Based on above technical scheme, the fingerprint identification device of this application embodiment sets up the lateral wall of electronic equipment's center with the prism, and the light signal that further will be used for fingerprint identification's light source transmission through the prism guides to human finger, then this light signal passes LCD screen and reachs the fingerprint identification module, can realize optical fingerprint identification under the screen.
Drawings
Fig. 1 is a schematic plan view of an electronic device to which the present application may be applied.
Fig. 2 is a schematic partial cross-sectional view along a-a of the electronic device shown in fig. 1.
Fig. 3 to 8 are schematic structural views of an optical fingerprint device according to an embodiment of the present application.
Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
As the smart terminal moves into the full-screen era, the fingerprint acquisition area on the front side of the electronic device is squeezed by the full-screen, and therefore the Under-screen (or Under-screen) fingerprint identification technology is receiving more and more attention. Fingerprint identification technology is installed in the display screen below with fingerprint identification device (for example fingerprint identification module) under the screen to realize carrying out the fingerprint identification operation in the display area inside of display screen, need not set up the fingerprint collection region in the positive region except that the display area of electronic equipment.
The underscreen fingerprint identification technology may include underscreen optical fingerprint identification technology, underscreen ultrasonic fingerprint identification technology, or other types of underscreen fingerprint identification technology.
Taking the example of an off-screen optical fingerprinting technique, the off-screen optical fingerprinting technique uses light returning from the top surface of the device display assembly for fingerprint sensing and other sensing operations. The returning light carries information of an object (e.g., a finger) in contact with the top surface, and a specific optical sensor module located below the display screen is implemented by capturing and detecting the returning light. The design of the particular optical sensor module may be such that the desired optical imaging is achieved by appropriately configuring the optical elements used to capture and detect the returned light.
It should be understood that the technical solutions of the embodiments of the present application may be applied to various electronic devices, and more particularly, may be applied to an electronic device having a display screen. For example, portable or mobile computing devices such as smart phones, notebook computers, tablet computers, game devices, and other electronic devices, but the embodiment of the present application is not limited thereto.
It should also be understood that, the technical solution of the embodiment of the present application may perform other fingerprint identification besides fingerprint identification, for example, living body identification, and the like, which is also not limited in the embodiment of the present application.
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
It should be noted that, for convenience of description, like reference numerals denote like parts in the embodiments of the present application, and a detailed description of the like parts is omitted in different embodiments for the sake of brevity.
It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application and the overall thickness, length, width and other dimensions of the fingerprint recognition device shown in the drawings are only illustrative and should not be construed as limiting the present application in any way.
Fig. 1 and fig. 2 are schematic diagrams illustrating an electronic device 100 to which a fingerprint identification device may be applied, where fig. 1 is a schematic front view of the electronic device 100 to which the fingerprint identification device may be applied, and fig. 2 is a schematic partial sectional structure view of the electronic device 100 shown in fig. 1 along a-a.
As shown in fig. 1 and 2, the electronic device 100 may include a display 11 and a fingerprint recognition device 10, wherein the display 11 has a display area 102, and the fingerprint recognition device 10 is disposed below the display 11.
Optionally, in some embodiments of the present application, the Display screen 11 may also be a Liquid Crystal Display (LCD) or other passive light emitting Display screen, which is not limited in this embodiment.
Optionally, in some embodiments of the application, the display screen 11 may specifically be a touch display screen, which not only performs image display, but also detects a touch or pressing operation of a user, so as to provide a human-computer interaction interface for the user. For example, in an embodiment, the electronic device 100 may include a Touch sensor, which may be embodied as a Touch Panel (TP), and may be disposed on a surface of the display screen 11, or may be partially integrated or entirely integrated inside the display screen 11, so as to form the Touch display screen.
Optionally, in some embodiments of the present application, the fingerprint recognition device 10 may be an optical fingerprint recognition device, which may include an optical fingerprint sensor having an optically sensitive array, such as an optical fingerprint sensor; the optical sensing array includes a plurality of optical sensing units, and the area where the optical sensing array is located is a fingerprint collecting area of the fingerprint identification device 10, and the plurality of optical sensing units are used for collecting fingerprint feature information (such as fingerprint image information) of a user.
Optionally, in some embodiments of the present application, the optical sensing array of the fingerprint identification device 10 may be specifically a Photo detector array (or referred to as a Photo detector array) including a plurality of Photo detectors or Photo detectors distributed in an array, and the Photo detectors or Photo detectors may serve as the optical sensing units as described above.
The fingerprint identification device 10 may only include one optical fingerprint sensor, and the area of the fingerprint detection area of the fingerprint identification device 10 is small and the position of the fingerprint detection area is fixed, so that a user needs to press a finger to a specific position of the fingerprint detection area when inputting a fingerprint, otherwise the fingerprint identification device 10 may not collect a fingerprint image and the user experience is not good.
In other embodiments, the fingerprint recognition device 10 may specifically include a plurality of optical fingerprint sensors; the plurality of optical fingerprint sensors can be arranged in the middle area of the display screen side by side in a splicing mode, and the sensing areas of the plurality of optical fingerprint sensors jointly form a fingerprint detection area of the fingerprint identification device 10.
That is, the fingerprint detection area of the fingerprint recognition device 10 may include a plurality of sub-areas, each of which corresponds to a sensing area of one of the optical fingerprint sensors, so that the fingerprint collection area of the fingerprint recognition device 10 may be extended to a main area of the middle portion of the display screen, i.e., to a finger-pressing area, thereby implementing a blind-touch type fingerprint input operation. Alternatively, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area may also be extended to half or even the entire display area, thereby enabling half-screen or full-screen fingerprint detection.
Further, the fingerprint identification device 10 further includes an optical component, which may be disposed above the sensing array of the optical fingerprint sensor, and specifically includes a Filter layer (Filter), a light guide layer or a light path guide structure, and other optical elements, where the Filter layer may be used to Filter the ambient light penetrating through the finger, and the light guide layer or the light path guide structure is mainly used to guide the reflected light reflected from the surface of the finger to the sensing array for optical detection.
The light guide layer or the light path guide structure of the optical component has various implementation schemes.
As an embodiment, the light guide layer may be specifically a Collimator (collimater) layer made of a semiconductor silicon wafer, and has a plurality of collimating units or a micro-hole array, the collimating units may be specifically small holes, light rays perpendicularly incident to the collimating units may pass through and be received by optical sensing units below the collimating units in reflected light reflected by a finger, and light rays with an excessively large incident angle are attenuated by multiple reflections inside the collimating units, so that each optical sensing unit can basically only receive reflected light reflected by fingerprint lines directly above the optical sensing unit, and the sensing array can detect a fingerprint image of the finger.
As another embodiment, the light guide layer or the light path guiding structure may also be an optical Lens (Lens) layer, which has one or more Lens units, such as a Lens group composed of one or more aspheric lenses, and is used to converge the reflected light reflected from the finger to the sensing array therebelow, so that the sensing array can image based on the reflected light, thereby obtaining the fingerprint image of the finger. Optionally, the optical lens layer may further be formed with a pinhole in an optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to enlarge a field of view of the fingerprint identification device, so as to improve a fingerprint imaging effect of the fingerprint identification device.
In other embodiments, the light guide layer or the light path guiding structure may also specifically adopt a Micro-Lens (Micro-Lens) layer, the Micro-Lens layer has a Micro-Lens array formed by a plurality of Micro-lenses, which may be formed above the sensing array through a semiconductor growth process or other processes, and each Micro-Lens may respectively correspond to one of the sensing units of the sensing array.
In addition, other optical film layers, such as a dielectric layer or a passivation layer, may be further formed between the microlens layer and the sensing unit, and more specifically, a light blocking layer having micro holes may be further included between the microlens layer and the sensing unit, wherein the micro holes are formed between the corresponding microlenses and the sensing unit, and the light blocking layer may block optical interference between the adjacent microlenses and the sensing unit, and enable light corresponding to the sensing unit to be converged inside the micro holes through the microlenses and transmitted to the sensing unit through the micro holes for optical fingerprint imaging.
It should be understood that several implementations of the above-mentioned optical path guiding structure may be used alone or in combination, for example, a microlens layer may be further disposed below the collimator layer or the optical lens layer. Of course, when the collimator layer or the optical lens layer is used in combination with the microlens layer, the specific lamination structure or optical path thereof may need to be adjusted according to actual needs.
Optionally, in some embodiments of the present application, the fingerprint recognition device 10 may be disposed at least in a partial region below the display screen 11, such that the fingerprint acquisition region (or sensing region) of the fingerprint recognition device 10 is at least partially located within the display region 102 of the display screen 11.
As shown in fig. 1, the fingerprint acquisition area 130 is located in the display area 102 of the display screen 11. Therefore, when the user needs to unlock the electronic device or verify other fingerprints, the user only needs to press a finger on the fingerprint acquisition area 130 of the display screen 11, so that the input operation of the fingerprint can be realized.
Because the fingerprint collection can be implemented inside the display area 102 of the display screen 11, the electronic 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), and thus a full-screen scheme can be adopted, that is, the display area 102 of the display screen 11 can be basically extended to the whole front surface of the electronic device 100.
It should be understood that the fingerprint collection area 130 shown in fig. 1 is only an example, and the embodiment of the present application is not limited thereto. For example, in other alternative embodiments, the fingerprint recognition device 10 may be disposed in the entire area below the display screen 11, so as to extend the fingerprint acquisition area 130 to the entire display area 102 of the display screen 11, thereby realizing full-screen fingerprint recognition.
It should also be understood that, in an implementation, the electronic device 100 may further include a protective cover plate 110, the protective cover plate 110 may be a transparent cover plate, such as a glass cover plate or a sapphire cover plate, which is located above the display screen 11 and covers the front surface of the electronic device 100, and a protective layer may be further disposed on a surface of the protective cover plate 110. Therefore, in the embodiment of the present application, the pressing of the display screen 11 by the finger may actually mean that the finger presses the cover plate 110 above the display screen 11 or a surface of a protective layer covering the cover plate 110.
In the embodiment of the present application, the fingerprint identification device 10 uses an external light source to provide an optical signal for fingerprint detection. Taking an example that the fingerprint recognition device is applied to an LCD screen having a backlight module and a liquid crystal panel, in order to support the under-screen fingerprint detection of the LCD screen, the electronic device 100 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 LCD screen or in an edge area below a protective cover plate of the mobile terminal, and the fingerprint recognition device may be disposed below the edge area of the liquid crystal panel or the protective cover plate and guided through a light path so that the fingerprint detection light may reach the fingerprint recognition device; alternatively, the fingerprint recognition device may be disposed below the backlight module, and the backlight module may be perforated or otherwise optically designed to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the fingerprint recognition device by performing perforation or other optical designs on film layers such as a diffusion sheet, a brightness enhancement sheet, a reflection sheet, and the like.
A Circuit board 150, such as a Flexible Printed Circuit (FPC), may be disposed below the fingerprint identification device 10, and the fingerprint identification device 10 may be soldered to the Circuit board 150 through a pad, and electrically interconnected with other peripheral circuits or other components of the electronic device 100 and transmitted signals through the Circuit board 150. For example, the fingerprint identification device 10 may receive a control signal from a processing unit of the electronic apparatus 100 through the circuit board 150, and may output the fingerprint detection signal to a processing unit or a control unit of the electronic apparatus 100 through the circuit board 150.
When the display panel 11 is a non-self-luminous display panel, such as an LCD panel or other passive luminous display panel, a backlight module is required as a light source of the display panel 11. However, due to the optical characteristics of the backlight module, after the visible light emitted by the backlight module is subjected to image display, the light signal reflected by the human finger is very weak, and fingerprint identification cannot be realized.
The embodiment of the application provides a fingerprint identification device, which can realize optical fingerprint identification under an LCD screen.
Fig. 3 to 8 are schematic structural views of a fingerprint recognition device according to an embodiment of the present application, which can be applied to an electronic apparatus having an LCD screen.
As shown in fig. 3 to 8, the fingerprint recognition device may be applied to an electronic apparatus having an LCD screen 200, and may include:
the prism 300 is arranged on the side wall of the middle frame 210 of the electronic device and used for reflecting or refracting the first optical signal emitted by the light source 400 and then irradiating the first optical signal to a human finger above the LCD screen 200;
It should be understood that the fingerprint identification device may correspond to the fingerprint identification device 10 in the foregoing embodiments, and the specific implementation thereof refers to the related description of the fingerprint identification device 10, and for brevity, the description is omitted here.
Optionally, in some embodiments of the present application, the fingerprint identification module 500 includes:
at least one fingerprint sensor comprising a plurality of sensor pixels for receiving the infrared light signal to be returned from the human finger to acquire a fingerprint image of the human finger;
an optical component disposed above the plurality of sensor pixels for guiding the infrared light signal returned from the human finger to the plurality of sensor pixels for optical fingerprint detection.
The at least one fingerprint sensor may correspond to the optical fingerprint sensor of the foregoing embodiment, and the optical component may correspond to the optical component of the foregoing embodiment, and for specific implementation, reference may be made to relevant descriptions in the foregoing embodiment, and for brevity, details are not repeated here.
It should be understood that in the embodiments of the present application, the sensor pixels may also be referred to as sensing units, optical sensing units, etc., and information collected by one sensor pixel may be used to form one pixel in a fingerprint image.
Optionally, in some embodiments of the present application, the LCD panel 200 includes a liquid crystal panel 240 and a backlight module 230, the backlight module 230 is disposed below the liquid crystal panel 240, and the backlight module 230 includes a backlight light source for image display, and the backlight light source may use a visible light source. Namely, the optical signal for displaying the image on the LCD panel is visible light, and specifically, the visible light source may be any light source located at the back of the liquid crystal panel. For example, the visible light source may be an Electroluminescent (EL) backlight, a compact Cold Cathode Fluorescent Lamp (CCFL), or an LED backlight.
It should be understood that in the embodiment of the present application, the fingerprint identification device may include a light source 400 for optical fingerprint detection, as an example, the light source may be an infrared light source, which emits an infrared light signal for fingerprint detection, the infrared light signal being invisible light; in other embodiments, the light source may be a light source of non-visible light with other specific wavelength, as long as the wavelength band is different from that of the light source for displaying an image.
It should be understood that, in the embodiment of the present application, the second optical signal received by the fingerprint identification module 500 for fingerprint identification may be an optical signal optically processed by a human finger on the first optical signal emitted by the light source 400. For example, the optical signal received by the fingerprint identification module 500 may be an optical signal reflected by a human finger and passing through the LCD panel 200, an optical signal diffused by a human finger and passing through the LCD panel 200, or an optical signal transmitted by a human finger and passing through the LCD panel 200. This is not particularly limited in the embodiments of the present application.
In this application embodiment, be provided with prism 300 on the lateral wall of center 210 of electronic equipment, the first light signal warp of light source 400 transmission prism 300 reflection or refraction back can shine the human finger of LCD screen 200 top, further warp reach after the transmission of human finger fingerprint identification module 500 is in order to carry out optical fingerprint identification under the screen.
Therefore, in the fingerprint identification device of the embodiment of the present application, the optical signal for fingerprint identification uses the infrared optical signal emitted by the light source 400, and the optical signal for displaying an image uses the visible optical signal emitted by the visible light source, so that interference of visible light on fingerprint identification can be avoided, and the infrared optical signal is invisible light, which does not affect the displayed image. Further, through setting up the prism on the lateral wall of electronic equipment's center, thereby the prism can lead the infrared light signal of light source transmission to human finger, then passes LCD screen arrival fingerprint identification module, can realize optical fingerprint identification under the screen.
As shown in fig. 3 to 8, the backlight module 230 may include a light guide plate (light guide plate)231, a reflective film 232 and a reinforcing steel plate 233. Further, a brightness enhancement film and a diffusion film may be further included above the light guide plate 231.
Specifically, visible light emitted by the backlight light source of the backlight module 230 passes through the light guide plate 231 and then is transmitted to the diffusion film 232, light diffused by the diffusion film 232 is transmitted to the brightness enhancement film, and the brightness enhancement film is used for gaining received optical signals and transmitting the gained optical signals to the liquid crystal panel 240 for image display.
It should be understood that the backlight module 230 shown in fig. 3 to 8 is only an example, and the embodiment of the present application is not limited thereto, for example, the backlight module may not include the stiffening plate 233.
In the embodiment of the present application, the liquid crystal panel 240 may be connected to a driving Circuit of the electronic device through a Flexible Printed Circuit (FPC) 220, and is configured to drive the liquid crystal panel for image display, that is, the liquid crystal PFC may electrically connect the liquid crystal panel and an external driving Circuit.
In some embodiments of the present application, as shown in fig. 3 to 5, the side wall of the middle frame 210 of the electronic device is provided with a slot, and the prism 300 is disposed in the slot. For example, the prism 300 may be fixed in the groove by glue or injection molding.
As shown in fig. 3 to 5, the screen FPC has a bent structure and has a sidewall in a non-horizontal direction (e.g., a vertical direction), the sidewall of the screen FPC is opposite to the sidewall of the middle frame, and the light source 400 may be disposed on the sidewall of the screen PFC220 so that the light signal emitted from the light source 400 can reach the prism 300. For example, the light source 400 is fixed on the sidewall of the screen FPC 220 by soldering or conductive paste.
It should be understood that the embodiment of the present application is not particularly limited to the specific structure of the prism 300 and the specific position relationship between the light source 400 and the prism 300, and in practical applications, the optical parameters of the prism 300, such as the surface type, the angle, the transmittance, and the refractive index, and the position relationship between the light source 400 and the prism may be adjusted according to the specific light path from the light source to the fingerprint identification module.
In some embodiments, the light source 400 and the prism 300 are disposed opposite to each other and staggered to enable the first light signal to be incident on the prism, and the first light signal is reflected or refracted by the prism 300 to be irradiated to a human finger above the LCD screen.
The shape of the prism is not particularly limited in the embodiments of the present application, and as an example, the prism 300 is a triangular prism, and the slot may also be a triangular strip slot, and as another example, the prism 300 may also be a trapezoidal prism, and the slot may also be a trapezoidal strip slot.
Furthermore, a reflecting film can be arranged on the binding surface of the prism and the groove to increase the reflectivity of the first optical signal in the prism, so that the amount of the optical signal irradiated to the human finger is increased, and the fingerprint identification performance is improved.
In some embodiments, the slot is opened on a sidewall of the middle frame near the short side of the electronic device (or the chin of the electronic device), and the light source 400 is disposed on a sidewall of the screen FPC 220 near the chin of the electronic device, so that the first optical signal is emitted from the chin position of the electronic device to the human finger without passing through the backlight module of the LCD screen, thereby reducing the loss of the optical signal.
In some embodiments, the light source 400 may be fixed to a sidewall of the screen FPC 220 by a glue 401.
In one implementation, as shown in fig. 3, the fingerprint identification module 500 is disposed below a middle frame 210 of the electronic device, wherein a first opening 211 is formed in a region of the middle frame 210 where the fingerprint identification module 500 is fixed, and a second opening 2330 is formed in a region of a reinforcing rigid plate 233 of the backlight module of the LCD panel corresponding to the upper side of the fingerprint identification module, so that the second optical signal is incident to the fingerprint identification module 500.
Optionally, in this implementation, the size of the first opening 211 is not smaller than the corresponding size of the FOV of the fingerprint identification module on the middle frame 210, and the size of the second opening 2330 is not smaller than the corresponding size of the FOV of the fingerprint identification module on the stiffening plate 233, so that the second optical signal returned from the human finger within the FOV of the fingerprint identification module can be received by the fingerprint identification module.
In some embodiments, the first opening 211 is opened in the middle area or the middle lower area of the middle frame, and the second opening 2330 is opened in the middle area or the middle lower area of the stiffening plate, so that the fingerprint detection area of the fingerprint identification module is located in the middle position or the middle lower position of the display area of the LCD screen.
Optionally, the fingerprint identification module 500 is fixed below the opening of the middle frame 210 by an optical adhesive or foam 501. In some embodiments, the optical glue may be any one of an optical liquid glue or an optical solid glue.
As another implementation manner, as shown in fig. 4, the fingerprint identification module 500 is fixed below the stiffening plate 233 in the backlight module 230 of the LCD panel, wherein a second opening 2330 is opened in a region of the stiffening plate 233 corresponding to the upper side of the fingerprint identification module to allow the second optical signal to be incident on the fingerprint identification module 500.
In this implementation, the size of the second opening 2330 is not smaller than the corresponding size of the FOV of the fingerprint identification module on the stiffener, so that the second optical signal returning from the human finger within the FOV of the fingerprint identification module can be received by the fingerprint identification module.
Optionally, the fingerprint identification module 500 is fixed below the reinforcing rigid plate 233 by an optical cement or foam 501. In some embodiments, the optical glue may be any one of an optical liquid glue or an optical solid glue.
As another implementation manner, as shown in fig. 5, the fingerprint identification module 500 is fixed on the upper surface 212 of the middle frame 210 and is located below the stiffening plate 233 in the backlight module of the LCD panel, wherein a second opening 2330 is opened in a region of the stiffening plate 2300 in the backlight module of the LCD panel corresponding to the upper side of the fingerprint identification module so that the second optical signal is incident on the fingerprint identification module 500.
Optionally, in this implementation, the size of the second opening 2330 is not smaller than the corresponding size of the FOV of the fingerprint identification module on the stiffener, so that the second optical signal returning from the human finger within the FOV of the fingerprint identification module can be received by the fingerprint identification module.
In some embodiments, the inner bottom surface 212 of the middle frame 210 is provided with a groove 2120, and the fingerprint identification module 500 is disposed in the groove 2120, so that the thickness of the electronic device on which the fingerprint identification module is mounted can be reduced.
Optionally, in this implementation, the fingerprint identification module 500 may be fixed in the groove 2120 by optical glue or foam. In some embodiments, the optical glue may be any one of an optical liquid glue or an optical solid glue.
In the embodiment of the present application, the second opening 2330 is formed in the reinforcing steel plate 233, so that the visible light signal can be prevented from being transmitted to the direction opposite to the LCD screen as much as possible, the backlight module 233 is prevented from being damaged due to external impact, and the energy loss of the infrared light signal for fingerprint recognition when passing through the reinforcing steel plate 233 can be effectively reduced.
Optionally, in some embodiments of the present application, the optical refractive indexes of the optical adhesive and the liquid crystal panel are the same or similar, so that the utilization rate of the optical signal emitted by the light source can be improved as much as possible.
In other embodiments of the present application, as shown in fig. 6 to 8, a support 600 is disposed on a sidewall of the middle frame 210, the prism 300 is disposed on the support 600, and the light source 400 is disposed under the support 600, so that the first optical signal is refracted or reflected by the prism 300 and then irradiates the human finger.
Alternatively, the prism 300 may be fixed on the bracket of the middle frame 210 by optical glue. In some embodiments, the optical glue may be any one of an optical liquid glue or an optical solid glue.
Optionally, the bracket 600 is a light-transmitting structure, for example, a light-transmitting material, or a light-proof material may also be used, but the light-proof material is provided with a hollow for transmitting the first optical signal emitted by the light source 400.
In some embodiments, the bracket 600 is disposed on a side wall of the middle frame near the chin of the electronic device to enable the first optical signal to exit from the chin position of the electronic device to the human finger without passing through the backlight module of the LCD screen, so that loss of the optical signal can be reduced.
As an implementation, the side wall of the middle frame near the chin of the electronic device may be thinned to form an accommodation space at the thinned side wall of the middle frame, and the prism and the light source may be further disposed in the accommodation space.
Fig. 6 to 8 further show three typical positions of the fingerprint identification module, which correspond to the setting positions of the fingerprint identification module in fig. 3 to 5, and the detailed description refers to the related description of the foregoing embodiments, and is not repeated herein for brevity.
In the embodiment of the application, the horizontal distance between the fingerprint identification module and the chin of the electronic equipment is within 50nm, and the vertical distance between the fingerprint identification module and the light-emitting layer substrate of the LCD screen of the electronic equipment is between 150nm and 200nm, so that the whole machine design requirement and the assembly requirement of the electronic equipment can be met.
In the above embodiments, the foam area 202 is further disposed between the backlight module 230 and the inner bottom surface 212 of the middle frame, and is used for buffering the damage to the display screen when the electronic device is squeezed or collided.
Optionally, in some embodiments, the fingerprint recognition device further comprises: and the optical filter is used for filtering optical signals which are not used for fingerprint detection. For example, the visible light transmitted to the optical filter can be filtered, so that the recognition quality of the fingerprint recognition module 500 can be further improved.
In the embodiment of the present application, the optical filter may be specifically configured to filter out visible wavelengths, for example, visible light used for image display. The optical filter may in particular comprise one or more optical filters, which may be configured, for example, as a band-pass filter, to filter out light emitted by the visible light source, while not filtering out infrared light signals. The one or more optical filters may be implemented, for example, as an optical filter coating formed on one or more continuous interfaces, or may be implemented as one or more discrete interfaces.
It should be understood that the filter may be fabricated on the surface of any optical component or along the optical path to the fingerprint recognition module 500 of the optical signal returned via reflection or scattering by the human finger. For example, the optical filter may be attached to the bottom surface of the liquid crystal panel 240, the upper side of the reinforcing steel plate 233, or integrated into the fingerprint recognition module 500.
The fingerprint identification device of the embodiment of the present application may further include other structures, such as an FPC, for implementing electrical interconnection and signal transmission with other peripheral circuits or other components of the electronic device, for example, the fingerprint identification device may receive a control signal from a processing unit of the electronic device through the FPC, and may further output the fingerprint detection signal to the processing unit or the control unit of the electronic device through the circuit board 150.
The embodiment of the present application also provides an electronic device, as shown in fig. 9, the electronic device 70 may include a fingerprint recognition device 72 and an LCD screen 71, where the fingerprint recognition device 72 is disposed below the LCD screen 71.
Optionally, in some embodiments of the present application, the fingerprint identification device 71 may be the fingerprint identification device in fig. 3 to 8, and for specific implementation, reference is made to the related description of the foregoing embodiments, and for brevity, no further description is provided here.
Optionally, in some embodiments of the present application, the LCD screen may be the LCD screen 200 in fig. 3 to 8, and for specific implementation, reference is made to the related description of the foregoing embodiments, and for brevity, details are not repeated here.
It is to be understood that the terminology used in the embodiments of the present application and the appended claims is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application.
For example, as used in the examples of this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Those of skill in the art would appreciate that the various illustrative elements and algorithm steps 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 embodiments of the present application.
If implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially implemented or make a contribution to the prior art, or may be implemented in the form of a software product stored in a storage medium and including several 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 methods described in the embodiments of the present application. And the aforementioned storage medium includes: u disk, removable hard disk, read only memory, random access memory, magnetic or optical disk, etc. for storing program codes.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses, devices and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed electronic device, apparatus and method may be implemented in other ways.
For example, the division of a unit or a module or a component in the above-described device embodiments is only one logical function division, and there may be other divisions in actual implementation, for example, a plurality of units or modules or components may be combined or may be integrated into another system, or some units or modules or components may be omitted, or not executed.
Also for example, the units/modules/components described above as separate/display components may or may not be physically separate, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the units/modules/components can be selected according to actual needs to achieve the purposes of the embodiments of the present application.
Finally, it should be noted that the above shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The above description is only a specific implementation of the embodiments of the present application, but the scope of the embodiments of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the embodiments of the present application, and all the changes or substitutions should be covered by the scope of the embodiments of the present application. Therefore, the protection scope of the embodiments of the present application shall be subject to the protection scope of the claims.
Claims (23)
1. A fingerprint identification device is applied to an electronic device with a Liquid Crystal Display (LCD) screen, and comprises:
the prism is arranged on the side wall of the middle frame of the electronic equipment and used for reflecting or refracting a first optical signal emitted by a light source and irradiating the first optical signal to a human finger above the LCD screen;
the fingerprint identification module is used for setting up the below of LCD screen, the fingerprint identification module is used for receiving the second light signal in order to acquire the fingerprint image of human finger, the second light signal is follow in the first light signal human finger returns and passes the light signal of LCD screen.
2. The fingerprint recognition device of claim 1, wherein a slot is disposed on a side wall of the middle frame, and the prism is fixed in the slot.
3. The fingerprint recognition device of claim 2, wherein the slot is disposed on a side wall of the middle frame of the electronic device near the short side.
4. The fingerprint recognition device of claim 2 or 3, wherein the prism is fixed in the slot by glue or injection molding.
5. The fingerprint recognition device according to any one of claims 2 to 4, wherein the light source is fixed on a side wall of a screen flexible circuit board FPC of the LCD screen, the side wall of the screen FPC and a side wall of the middle frame being opposed to each other so that the first optical signal emitted from the light source is incident to the prism.
6. The fingerprint recognition device according to claim 5, wherein the light source is fixed on the side wall of the screen FPC by soldering or conductive adhesive.
7. The fingerprint identification device of claim 5 or 6, wherein the light source and the prism are arranged oppositely and staggeredly, so that the first light signal is reflected or refracted by the prism and then irradiates the human finger above the LCD screen.
8. The fingerprint identification device of claim 1, wherein a support is disposed on a side wall of the middle frame, the prism is disposed on the support, the light source is disposed under the support, and the support is a light-transmitting structure, so that the first light signal is refracted or reflected by the prism and then irradiates the human finger.
9. The fingerprint recognition device according to claim 8, wherein a base plate is disposed on an inner bottom surface of the middle frame below the holder, and the light source is fixed on the base plate.
10. The fingerprint identification device of claim 9, wherein the substrate is fixed to the inner bottom surface of the middle frame by glue, solid glue, foam or soldering.
11. The fingerprint recognition device according to claim 9 or 10, wherein the bracket is disposed on a side wall of the middle frame of the electronic apparatus near the short side.
12. The fingerprint identification device according to any one of claims 1 to 11, wherein the fingerprint identification module is fixed below the middle frame, wherein an area of the middle frame where the fingerprint identification module is fixed is opened, and an area of a reinforcing rigid plate in a backlight module of the LCD screen corresponding to the upper side of the fingerprint identification module is opened, so that the second optical signal is incident to the fingerprint identification module.
13. The fingerprint identification device of claim 12, wherein the fingerprint identification module is fixed below the middle frame by optical cement or foam.
14. The fingerprint identification device according to any one of claims 1 to 11, wherein the fingerprint identification module is fixed below a stiffening plate in a backlight module of the LCD panel, wherein an area of the stiffening plate above the fingerprint identification module corresponding to the area of the fingerprint identification module is perforated to allow the second light signal to be incident on the fingerprint identification module.
15. The fingerprint identification device of claim 14, wherein the fingerprint identification module is fixed below the stiffening plate by optical cement or foam.
16. The fingerprint identification device according to any one of claims 1 to 11, wherein the fingerprint identification module is fixed on the upper surface of the middle frame and located below a stiffening plate in the backlight module of the LCD screen, wherein an area of the stiffening plate in the backlight module of the LCD screen corresponding to the upper side of the fingerprint identification module is opened to allow the second optical signal to be incident on the fingerprint identification module.
17. The fingerprint identification device of claim 16, wherein the upper surface of the middle frame is provided with a groove, and the fingerprint identification module is arranged in the groove.
18. The fingerprint identification device of claim 16 or 17, wherein the fingerprint identification module is fixed in the groove by optical glue or foam.
19. The fingerprint recognition device according to any one of claims 1 to 18, wherein a horizontal distance between the fingerprint recognition module and the short side of the electronic device is within 50 nm.
20. The fingerprint identification device according to any one of claims 1 to 19, wherein a vertical distance between the fingerprint identification module and a light emitting layer substrate of an LCD screen of the electronic device is between 150nm and 200 nm.
21. The fingerprint recognition device of any one of claims 1-20, wherein the prism is a triangular prism or a trapezoidal prism.
22. The fingerprint recognition device of any one of claims 1-20, wherein the fingerprint recognition module comprises:
at least one fingerprint sensor comprising a plurality of sensor pixels for receiving the infrared light signal to be returned from the human finger to acquire a fingerprint image of the human finger;
an optical component disposed above the plurality of sensor pixels for guiding the infrared light signal returned from the human finger to the plurality of sensor pixels for optical fingerprint detection.
23. An electronic device, comprising:
a Liquid Crystal Display (LCD) screen;
the fingerprint recognition device according to any one of claims 1 to 22, said fingerprint recognition device being disposed below said LCD screen.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2020/073884 WO2021147020A1 (en) | 2020-01-22 | 2020-01-22 | Fingerprint recognition device and electronic apparatus |
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| CN111837127A true CN111837127A (en) | 2020-10-27 |
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| CN202080001547.7A Pending CN111837127A (en) | 2020-01-22 | 2020-01-22 | Fingerprint identification device and electronic equipment |
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| WO (1) | WO2021147020A1 (en) |
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| CN114926868A (en) * | 2022-05-16 | 2022-08-19 | 荣耀终端有限公司 | Fingerprint module, control method of fingerprint module and electronic equipment |
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| GB0921644D0 (en) * | 2009-12-10 | 2010-01-27 | St Microelectronics Res & Dev | Improvements in or relating to optical navigation devices |
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| WO2020124306A1 (en) * | 2018-12-17 | 2020-06-25 | 深圳市汇顶科技股份有限公司 | Liquid crystal display fingerprint module, in-screen fingerprint recognition system, and electronic device |
| CN110414467A (en) * | 2019-08-05 | 2019-11-05 | 深圳市隆利科技股份有限公司 | Fingerprint recognition terminal device |
| CN110458124B (en) * | 2019-08-16 | 2024-09-20 | 深圳阜时科技有限公司 | Optical detection device |
| CN110458125B (en) * | 2019-08-16 | 2024-06-18 | 深圳阜时科技有限公司 | Optical detection device |
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| CN109196522A (en) * | 2018-08-24 | 2019-01-11 | 深圳市汇顶科技股份有限公司 | Backlight module shields lower fingerprint identification method, device and electronic equipment |
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