CN110945527B - Fingerprint identification device and electronic equipment - Google Patents

Fingerprint identification device and electronic equipment Download PDF

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Publication number
CN110945527B
CN110945527B CN201980002486.3A CN201980002486A CN110945527B CN 110945527 B CN110945527 B CN 110945527B CN 201980002486 A CN201980002486 A CN 201980002486A CN 110945527 B CN110945527 B CN 110945527B
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fingerprint
optical
display screen
light
fingerprint sensor
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CN110945527A (en
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王文轩
沈健
纪登鑫
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Shenzhen Goodix Technology Co Ltd
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Shenzhen Goodix Technology Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • 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
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Image Input (AREA)

Abstract

A fingerprint identification device and an electronic device can improve the light signal quantity while receiving an oblique light signal, thereby improving the fingerprint imaging effect and the fingerprint identification effect. The fingerprint identification device is applicable to electronic equipment with a display screen for carrying out off-screen optical fingerprint detection, and comprises: the optical fingerprint sensor is used for being arranged below the display screen in a mode of being non-parallel to the display screen; the optical component is arranged above the optical fingerprint sensor and comprises at least one lens, and is used for transmitting the fingerprint optical signal returned after being reflected or scattered by the finger above the display screen to the optical fingerprint sensor for fingerprint identification, wherein the fingerprint optical signal is an optical signal inclined relative to the display screen.

Description

Fingerprint identification device and electronic equipment
Technical Field
The present application relates to the field of optical fingerprint technology, and more particularly, to a fingerprint identification apparatus and an electronic device.
Background
With the development of biometric identification technology, the application of the under-screen fingerprint identification technology in portable terminals such as mobile phones is becoming wider.
In some specific scenarios, the under-screen fingerprint recognition device may receive the oblique light signal to perform fingerprint recognition so as to meet specific requirements, for example, by receiving the oblique light signal to reduce the optical path distance in the fingerprint recognition device, thereby reducing the thickness of the fingerprint recognition device; or by receiving the oblique light signal, the fingerprint detection effect of the dry finger can be improved, etc. However, when the fingerprint identification device receives the optical signal in the inclined direction, the optical signal quantity is attenuated, so that the optical signal quantity received by the fingerprint identification device is insufficient, the fingerprint imaging effect is influenced, and finally the fingerprint identification effect is influenced.
Therefore, how to improve the optical signal quantity while receiving the oblique optical signal by the fingerprint identification device, so as to improve the fingerprint imaging effect and the fingerprint identification effect is a problem to be solved urgently.
Disclosure of Invention
The embodiment of the application provides a fingerprint identification device and electronic equipment, which can improve the optical signal quantity while receiving oblique optical signals, thereby improving the fingerprint imaging effect and the fingerprint identification effect.
In a first aspect, a fingerprint recognition device is provided, suitable for use in an electronic device having a display screen for off-screen optical fingerprint detection, the fingerprint recognition device comprising:
the optical fingerprint sensor is used for being arranged below the display screen in a mode of being non-parallel to the display screen;
the optical component is arranged above the optical fingerprint sensor and comprises at least one lens, and is used for transmitting the fingerprint optical signal returned after being reflected or scattered by the finger above the display screen to the optical fingerprint sensor for fingerprint identification, wherein the fingerprint optical signal is an optical signal inclined relative to the display screen.
In the application, when the fingerprint identification device receives the fingerprint optical signal inclined relative to the display screen, the optical fingerprint sensor is placed at a certain included angle with the plane of the display screen, namely the optical fingerprint sensor is placed in a non-horizontal way, so that the included angle between the fingerprint optical signal and the vertical plane of the optical fingerprint sensor can be reduced, the optical signal received by the optical fingerprint sensor is vertically incident or nearly vertically incident on the optical fingerprint sensor, and therefore, when the fingerprint identification device receives the inclined fingerprint optical signal, the light intensity of the optical signal received by the optical fingerprint sensor can be increased, and the fingerprint image quality and fingerprint identification effect can be improved.
In one possible implementation, the display screen includes a fingerprint detection area, and the optical component is configured to transmit the fingerprint light signal returned after reflection or scattering by a finger above the fingerprint detection area;
the optical fingerprint sensor faces the fingerprint detection area and is arranged obliquely below the fingerprint detection area.
In one possible implementation, the angle between the plane of the optical fingerprint sensor and the plane of the display screen is ω, where 0 ° < ω < 90 °.
In one possible implementation, 0 ° < ω < 30 °.
In one possible implementation, the incident angle of the fingerprint light signal with respect to the optical fingerprint sensor is θ - ω, where θ - ω is an angle between the fingerprint light signal and a vertical plane of the optical fingerprint sensor, and θ is an angle between the fingerprint light signal and a vertical plane of the display screen.
In one possible implementation, ω=θ, where θ is an angle between the fingerprint light signal and a vertical plane of the display screen.
In one possible implementation, the optical assembly includes: and the optical lens is used for receiving the fingerprint optical signal to perform fingerprint imaging, and is a spherical or aspheric lens.
In one possible implementation, the optical assembly further comprises: an aperture stop formed in the optical path of the at least one optical lens.
In one possible implementation, the focal plane of the optical lens is parallel to the optical fingerprint sensor.
In one possible implementation, the direction of the fingerprint light signal is parallel to the optical axis of the optical lens.
In one possible implementation, the at least one optical lens is fixed on the optical fingerprint sensor by a fixing component, and the at least one optical lens and the optical fingerprint sensor are not parallel to each other and are arranged below the display screen.
In one possible implementation, the optical assembly includes: a microlens array and at least one light blocking layer;
the at least one light blocking layer is positioned below the micro lens array and is provided with a plurality of light passing holes;
the micro lens array is used for receiving the fingerprint optical signals and converging the fingerprint optical signals to the plurality of light-passing holes;
the plurality of light-passing holes are used for transmitting the fingerprint light signals to the optical fingerprint sensor.
In one possible implementation, the fingerprint light signal is perpendicularly incident to the microlens array.
In one possible implementation, the microlens array and the at least one light blocking layer are integrally disposed over the optical fingerprint sensor by a semiconductor process;
the micro lens array, the at least one light blocking layer and the optical fingerprint sensor are all arranged below the display screen in a non-parallel manner.
In one possible implementation, the optical fingerprint sensor is disposed non-parallel below the display screen by a support structure;
the support structure is injection molding material, plastic material or metal material.
In one possible implementation manner, the display screen is an organic light emitting diode display screen, wherein the fingerprint light signal is a light signal formed by reflecting or scattering excitation light emitted by a part of display units of the organic light emitting diode display screen on a finger above the organic light emitting diode display screen and returned.
In one possible implementation manner, the display screen is a liquid crystal display screen with a backlight module, and the liquid crystal display screen comprises the backlight module;
the fingerprint light signal is a light signal formed by reflecting or scattering infrared excitation light emitted by an external light source to fingers above the liquid crystal display screen, returning the infrared excitation light and refracting the infrared excitation light through one of the first prism film side surface and the second prism film side surface of the prism film of the backlight module.
In this implementation manner, the optical fingerprint sensor is placed obliquely, so that no dark stripe exists in the fingerprint image detected by the optical fingerprint sensor, fingerprint identification under the liquid crystal display screen is realized, in addition, the light intensity of the fingerprint light signal received by the optical fingerprint sensor can be increased, and the fingerprint image quality and the fingerprint identification effect can be further improved.
In one possible implementation, the optical assembly includes at least one optical lens and an aperture stop, where an angle between a plane of the optical fingerprint sensor and a plane of the display screen is ω, where 90 ° > ω > β/2+arctan (l/d), l is 1/2 of a length of the optical fingerprint sensor, d is a distance from the aperture stop to the optical fingerprint sensor, and β is a divergence angle of a shadow area determined according to the prism film.
In one possible implementation, the optical assembly is positioned such that an optical signal refracted through a side of another one of the prismatic films is deflected away from the optical assembly and cannot be transmitted to the optical fingerprint sensor.
In one possible implementation, the optical fingerprint sensor is positioned such that the optical signal after being refracted through the side of another one of the prismatic films is deflected away from the optical fingerprint sensor.
In one possible implementation, the fingerprint recognition device further includes:
the filter layer is arranged in the light path between the display screen and the optical fingerprint sensor and is used for filtering out optical signals of non-target wave bands and transmitting the optical signals of the target wave bands.
In a second aspect, an electronic device is provided comprising a display screen and a fingerprint recognition device as in the first aspect or any possible implementation of the first aspect, wherein the fingerprint recognition device is arranged below the display screen for off-screen optical fingerprint detection.
In one possible implementation manner, the display screen is an organic light emitting diode display screen, wherein the fingerprint light signal is a light signal formed by reflecting or scattering excitation light emitted by a part of display units of the organic light emitting diode display screen on a finger above the organic light emitting diode display screen and returned.
In one possible implementation, the display screen is a liquid crystal display screen, and the electronic device further includes:
and the infrared light source is used for providing infrared excitation light for fingerprint detection of the fingerprint identification device, the infrared excitation light irradiates at least part of the display area of the liquid crystal display screen, and the at least part of the display area at least partially covers the fingerprint detection area of the fingerprint identification device.
By arranging the fingerprint identification device in the electronic equipment, the electronic equipment has good fingerprint identification performance, the fingerprint identification success rate is improved, and the user experience is improved.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device to which an embodiment of the present application is applied.
Fig. 2 is a schematic structural view of a fingerprint recognition device according to an embodiment of the present application.
Fig. 3 is a schematic block diagram of another fingerprint recognition device according to an embodiment of the present application.
Fig. 4 is a schematic structural view of another fingerprint recognition device according to an embodiment of the present application.
Fig. 5 is a schematic structural view of another fingerprint recognition device according to an embodiment of the present application.
Fig. 6 is a schematic structural view of another fingerprint recognition device according to an embodiment of the present application.
Fig. 7 is a schematic block diagram of another fingerprint recognition device according to an embodiment of the present application.
Fig. 8 is a schematic structural view of a fingerprint recognition device under a liquid crystal display according to an embodiment of the present application.
Fig. 9a and 9b are perspective structural views and cross-sectional views of a prism film in a liquid crystal display.
Fig. 10 is a schematic diagram of a shadow of a fingerprint image formed by detection of an optical fingerprint sensor under a liquid crystal display according to an embodiment of the present application.
Fig. 11 is a schematic structural view of a fingerprint recognition device according to an embodiment of the present application.
Fig. 12 is a schematic structural view of another fingerprint recognition device according to an embodiment of the present application.
Fig. 13 is a schematic view showing calculation of an inclination angle of an optical fingerprint sensor under a liquid crystal display according to an embodiment of the present application.
Fig. 14 is a schematic view showing calculation of a translation distance of an optical fingerprint sensor under a liquid crystal display according to an embodiment of the present application.
Fig. 15 is a schematic structural view of another fingerprint recognition device according to an embodiment of the present application.
Fig. 16 is a schematic block diagram of an electronic device in accordance with an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.
It should be understood that the embodiments of the present application may be applied to optical fingerprint systems, including but not limited to optical fingerprint identification systems and products based on optical fingerprint imaging, and the embodiments of the present application are only described by way of example in terms of optical fingerprint systems, but should not be construed as limiting the embodiments of the present application in any way, and the embodiments of the present application are equally applicable to other systems employing optical imaging techniques, etc.
As a common application scenario, the optical fingerprint system provided by the embodiment of the application can be applied to smart phones, tablet computers and other mobile terminals or other electronic devices with display screens; more specifically, in the above electronic device, the fingerprint recognition device may be specifically an optical fingerprint device, which may be disposed in a partial area or an entire area Under the display screen, thereby forming an Under-screen (Under-display) optical fingerprint system. Alternatively, the fingerprint recognition device may be partially or fully integrated inside a display screen of the electronic apparatus, thereby forming an In-screen (In-display) optical fingerprint system.
Referring to fig. 1, a schematic structural diagram of an electronic device to which an embodiment of the present application may be applied is shown, where the electronic device 10 includes a display screen 120 and an optical fingerprint device 130, and the optical fingerprint device 130 is disposed in a partial area under the display screen 120. The optical fingerprint device 130 includes an optical fingerprint sensor, which includes a sensing array 133 having a plurality of optical sensing units 131, where the sensing array 133 is located or the sensing area thereof is the fingerprint detection area 103 of the optical fingerprint device 130. As shown in fig. 1, the fingerprint detection area 103 is located in the display area of the display screen 120. In an alternative embodiment, the optical fingerprint device 130 may also be disposed at other locations, such as the side of the display screen 120 or an edge non-transparent area of the electronic device 10, and the optical signals of at least a portion of the display area of the display screen 120 are directed to the optical fingerprint device 130 by an optical path design such that the fingerprint detection area 103 is actually located in the display area of the display screen 120.
It should be appreciated that the area of the fingerprint detection area 103 may be different from the area of the sensing array of the optical fingerprint device 130, for example, by an optical path design such as lens imaging, a reflective folded optical path design, or other optical path designs such as light converging or reflecting, the area of the fingerprint detection area 103 of the optical fingerprint device 130 may be made larger than the area of the sensing array of the optical fingerprint device 130. In other alternative implementations, the fingerprint detection area 103 of the optical fingerprint device 130 may also be designed to substantially coincide with the area of the sensing array of the optical fingerprint device 130 if light path guiding is performed, for example, by light collimation.
Therefore, when the user needs to unlock the electronic device or perform other fingerprint verification, the user only needs to press the finger against the fingerprint detection area 103 located on the display screen 120, so as to realize fingerprint input. Since fingerprint detection can be implemented in the screen, the electronic device 10 adopting the above structure does not need to have a special reserved space on the front surface to set fingerprint keys (such as Home keys), so that a comprehensive screen scheme can be adopted, that is, the display area of the display screen 120 can be basically expanded to the front surface of the whole electronic device 10.
As an alternative implementation manner, as shown in fig. 1, the optical fingerprint device 130 includes a light detecting portion 134 and an optical component 132, where the light detecting portion 134 includes an sensing array, and a reading circuit and other auxiliary circuits electrically connected to the sensing array, which may be fabricated on a chip (Die) such as an optical imaging chip or an optical fingerprint sensor by a semiconductor process, and the sensing array is specifically 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 as described above; the optical assembly 132 may be disposed over the sensing array of the light detection portion 134, which may include, among other optical elements, a light guiding layer or light path guiding structure that is primarily used to guide reflected light reflected from the finger surface to the sensing array for optical detection.
In particular implementations, the optical assembly 132 may be packaged in the same optical fingerprint component as the light detection portion 134. For example, the optical component 132 may be packaged on the same optical fingerprint chip as the optical detecting portion 134, or the optical component 132 may be disposed outside the chip on which the optical detecting portion 134 is disposed, for example, the optical component 132 is attached to the chip, or some of the components of the optical component 132 are integrated in the chip.
The light guiding layer or the light path guiding structure of the optical component 132 may have various implementations, for example, the light guiding layer may be a Collimator (Collimator) layer made of a semiconductor silicon wafer, which has a plurality of collimating units or a micropore array, the collimating units may be small holes, the light vertically incident to the collimating units from the reflected light reflected by the finger may pass through and be received by the optical sensing units below the collimating units, and the light with an excessive incident angle is attenuated by multiple reflections inside the collimating units, so each optical sensing unit basically only receives the reflected light reflected by the fingerprint lines above the optical sensing units, and the sensing array can detect the fingerprint image of the finger.
In another embodiment, the light guiding layer or light path guiding structure may also be an optical Lens (Lens) layer having one or more Lens units, such as a Lens group of one or more aspheric lenses, for converging the reflected light reflected from the finger to a sensing array of light detecting portions 134 thereunder so that the sensing array may image based on the reflected light, thereby obtaining a fingerprint image of the finger. Optionally, the optical lens layer may further form a pinhole in the optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to expand the field of view of the optical fingerprint device to improve the fingerprint imaging effect of the optical fingerprint device 130.
In other embodiments, the light guiding layer or the light path guiding structure may also specifically employ a Micro-Lens layer having a Micro-Lens array formed of a plurality of Micro-lenses, which may be formed over the sensing array of the light sensing part 134 by a semiconductor growth process or other processes, and each Micro-Lens may correspond to one of sensing cells of the sensing array, respectively. And, 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 particularly, a light blocking layer having micro holes formed between its corresponding microlens and sensing unit, which may block optical interference between adjacent microlenses and sensing unit, and allow light corresponding to the sensing unit to be converged into the inside of the micro holes by the microlenses and transmitted to the sensing unit through the micro holes for optical fingerprint imaging. It should be appreciated that several implementations of the above-described light path guiding structure may be used alone or in combination, for example, a microlens layer may be further provided under the collimator layer or the optical lens layer. Of course, when a collimator layer or an optical lens layer is used in combination with a microlens layer, the specific laminated structure or optical path thereof may need to be adjusted as actually needed.
As an alternative embodiment, the display screen 120 may employ a display screen having a self-luminous display unit, such as an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. Taking an OLED display as an example, the optical fingerprint device 130 may utilize a display unit (i.e., an OLED light source) of the OLED display 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection. When the finger 140 is pressed against the fingerprint detection area 103, the display 120 emits a light 111 to the target finger 140 above the fingerprint detection area 103, and the light 111 is reflected on the surface of the finger 140 to form reflected light or scattered light scattered inside the finger 140 to form scattered light, and in the related patent application, the reflected light and the scattered light are collectively referred to as reflected light for convenience of description. Since ridges (ribs) of the fingerprint and the ribs (valley) have different light reflection capacities, the reflected light 151 from the ridges of the fingerprint and the reflected light 152 from the ribs of the fingerprint have different light intensities, and the reflected light is received by the sensing array 134 in the optical fingerprint device 130 and converted into corresponding electrical signals, i.e., fingerprint detection signals after passing through the optical component 132; fingerprint image data can be obtained based on the fingerprint detection signal, and fingerprint matching verification can be further performed, thereby realizing an optical fingerprint recognition function in the electronic device 10.
In other embodiments, the optical fingerprint device 130 may also employ an internal light source or an external light source to provide an optical signal for fingerprint detection. In this case, the optical fingerprint device 130 may be adapted for non-self-luminous display screens, such as liquid crystal display screens (Liquid Crystal Display, LCD) or other passive luminous display screens. Taking the application to a liquid crystal display having a backlight module and a liquid crystal panel as an example, to support the under-screen fingerprint detection of the liquid crystal display, the optical fingerprint system of the electronic device 10 may further include an excitation light source for optical fingerprint detection, which may be specifically an infrared light source or a light source of non-visible light with a specific wavelength, which may be disposed under the backlight module of the liquid crystal display or under an edge region of a protective cover plate of the electronic device 10, and the optical fingerprint device 130 may be disposed under the liquid crystal panel or the edge region of the protective cover plate and guided through an optical path so that fingerprint detection light may reach the optical fingerprint device 130; alternatively, the optical fingerprint device 130 may be disposed under the backlight module, and the backlight module may be provided with holes or other optical designs on the film layers such as the diffusion sheet, the brightness enhancement sheet, and the reflection sheet to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint device 130. When the optical fingerprint device 130 employs an internal light source or an external light source to provide an optical signal for fingerprint detection, the detection principle is consistent with that described above.
It should be appreciated that in particular implementations, the electronic device 10 also includes a transparent protective cover plate, which may be a glass cover plate or a sapphire cover plate, that is positioned over the display screen 120 and covers the front of the electronic device 10. Because, in the embodiment of the present application, the so-called finger pressing on the display screen 120 actually means pressing on the cover plate above the display screen 120 or the surface of the protective layer covering the cover plate.
It should also be appreciated that the electronic device 10 may also include a circuit board 150 disposed below the optical fingerprint assembly 130. The optical fingerprint device 130 may be adhered to the circuit board 150 by a back adhesive, and electrically connected to the circuit board 150 by soldering with pads and wires. The optical fingerprint apparatus 130 may enable electrical interconnection and signal transmission with other peripheral circuits or other elements of the electronic device 10 through the circuit board 150. For example, the optical fingerprint device 130 may receive a control signal of the processing unit of the electronic apparatus 10 through the circuit board 150, and may also output a fingerprint detection signal from the optical fingerprint device 130 to the processing unit or the control unit of the electronic apparatus 10 or the like through the circuit board 150.
On the other hand, in some embodiments, the optical fingerprint device 130 may include only one optical fingerprint sensor, where the area of the fingerprint detection area 103 of the optical fingerprint device 130 is small and the position is fixed, so the user needs to press the finger to a specific position of the fingerprint detection area 103 when inputting the fingerprint, otherwise, the optical fingerprint device 130 may not be able to acquire the fingerprint image, resulting in poor user experience. In other alternative embodiments, the optical fingerprint device 130 may specifically include a plurality of optical fingerprint sensors; the plurality of optical fingerprint sensors may be disposed side by side below the display screen 120 in a spliced manner, and sensing areas of the plurality of optical fingerprint sensors together form the fingerprint detection area 103 of the optical fingerprint device 130. That is, the fingerprint detection area 103 of the optical fingerprint device 130 may include a plurality of sub-areas, each corresponding to a sensing area of one of the optical fingerprint sensors, so that the fingerprint acquisition area 103 of the optical fingerprint device 130 may be extended to a main area of the lower half of the display screen, that is, to a finger usual pressing area, thereby implementing a blind press type fingerprint input operation. Alternatively, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 103 may also be extended to half or even the whole display area, thereby achieving half-screen or full-screen fingerprint detection.
It should also be understood that in embodiments of the present application, the sensing array in the optical fingerprint device may also be referred to as a pixel array, and the optical sensing unit or sensing units in the sensing array may also be referred to as pixel units.
It should be noted that, the optical fingerprint device in the embodiment of the present application may also be referred to as an optical fingerprint recognition module, a fingerprint recognition device, a fingerprint recognition module, a fingerprint acquisition device, etc., where the above terms may be replaced with each other.
Fig. 2 shows a schematic block diagram of a fingerprint recognition device 200.
As shown in fig. 2, the fingerprint recognition device 200 includes: an optical assembly 210 and an optical fingerprint sensor 220, wherein the optical assembly 210 is configured to receive a fingerprint light signal reflected or scattered by the finger 140 over the display screen 120 and to direct the fingerprint light signal to the optical fingerprint sensor 220. The optical fingerprint sensor 220 is provided with a light detection array 221 on a surface thereof to detect fingerprint light signals for fingerprint recognition.
Alternatively, the light detection array 221 may be identical to the sensing array 133 of FIG. 1, and the optical assembly 210 may be identical to the optical assembly 132 of FIG. 1.
Optionally, as shown in fig. 2, the optical assembly 210 may include at least one optical lens for optically imaging the optical signal and transmitting the optical signal to the optical detection array.
Optionally, the optical assembly 210 may further include a collimating layer, as described above for the optical assembly 132 of fig. 1, having a plurality of collimating units for passing the optical signal incident perpendicularly to the collimating units; a microlens layer and a light blocking layer having micro holes for conducting an optical signal in a specific direction may be included; any other optical element for transmitting an optical signal is also possible, and the embodiment of the present application is not limited thereto.
In the embodiment of the present application, the optical component 210 is disposed below the display screen 120 of the electronic device, and the optical fingerprint sensor 220 is disposed below the optical component 210, where the optical fingerprint sensor 220 is disposed parallel to the display screen 120, that is, the light receiving surface of the light detection array 221 in the optical fingerprint sensor 220 is disposed parallel to the display screen 120.
As shown in fig. 2, the optical signal reflected or scattered by the finger 140 above the display 120 and passing through the optical component 210 is an oblique fingerprint optical signal 201, and the optical detection array 221 receives the oblique fingerprint optical signal 201.
Here, the oblique fingerprint optical signal 201 refers to an optical signal that is not perpendicular to the surface of the display screen, in other words, the propagation direction of the oblique fingerprint optical signal 201 forms an angle with the surface of the display screen that is not 90 °.
For example, when the display screen 120 and the light detection array 221 are both disposed in the horizontal direction, the vertical plane perpendicular to the surface of the display screen is the vertical direction, and the angle between the oblique fingerprint light signal 201 and the vertical direction, that is, the oblique angle of the oblique fingerprint light signal is θ, where 0 ° < θ < 90 °. If the light intensity of the inclined fingerprint light signal 201 is I 0 At this time, according to the cosine square law of the optical system, the light intensity I of the fingerprint light signal received by the light detection array 221 e The calculation formula (1) of (2) is:
I e ＝I 0 ×cos 4 theta formula (1)
As can be seen from the above equation, when θ increases, the light intensity I of the light signal received by the light detection array 221 e In other words, when the inclination angle of the inclined fingerprint light signal increases, the light intensity of the fingerprint light signal received by the light detection array 221 rapidly decreases, thereby affecting the fingerprint imaging and fingerprint recognition effects of the fingerprint recognition device.
Based on the above, the application provides the fingerprint identification device, and the optical fingerprint sensor in the fingerprint identification device is obliquely arranged, so that the included angle between the oblique optical signal and the vertical plane of the fingerprint identification device can be reduced, and the oblique optical signal received by the fingerprint identification device is vertically or nearly vertically incident on the optical fingerprint sensor, so that the optical intensity of the optical signal received by the optical fingerprint sensor can be increased while the oblique optical signal is received by the fingerprint identification device, and the fingerprint image quality and the fingerprint identification effect are improved.
The fingerprint recognition device according to the embodiment of the present application is described in detail below with reference to fig. 3 to 15.
In the embodiments shown below, the same reference numerals are used for the same structures for the sake of understanding, and detailed description of the same structures is omitted for the sake of brevity.
Fig. 3 is a schematic block diagram of a fingerprint recognition device 300 according to an embodiment of the present application, where the fingerprint recognition device 300 is configured to be disposed below a display screen 120 of an electronic device for fingerprint recognition.
As shown in fig. 3, the fingerprint recognition device 300 includes: an optical component 310 and an optical fingerprint sensor 320;
the optical fingerprint sensor 320 is disposed non-parallel below the display screen 120;
an optical assembly 310 comprising at least one lens, the optical assembly 310 being configured to transmit a fingerprint light signal 301 returned after reflection or scattering by a finger above the display screen 120 to the optical fingerprint sensor 320 for fingerprint identification, wherein the fingerprint light signal 301 is an optical signal tilted with respect to the display screen.
Specifically, the optical fingerprint sensor 320 may include a light detection array 321, where the light detection array 321 is grown on a surface of the optical fingerprint sensor 320, and is configured to receive an optical signal and convert the optical signal into a corresponding electrical signal. The plane of the light detecting array 321, i.e. the light receiving plane, has the same angle as the plane of the optical fingerprint sensor 320.
Specifically, the fingerprint optical signal 301 may be an optical signal that returns after being reflected or scattered by the finger 140 above the fingerprint detection area 203 in the display screen 120. The fingerprint detection area 203 is the sensing area of the light detection array 321 in the display screen 120. Alternatively, the light detection array 321 and the fingerprint detection area 203 may be the same as the sensing array 133 and the fingerprint detection area 103 in fig. 1, and the related description may refer to the above technical solution, which is not repeated here.
Specifically, when the fingerprint light signal 301 received by the fingerprint recognition device 300 is a light signal inclined with respect to the display screen, the fingerprint recognition device 300 may be disposed obliquely below the fingerprint detection area 203.
Optionally, when the optical fingerprint sensor 320 is disposed under the display screen 120 in a non-parallel manner, or when the optical fingerprint sensor 320 is disposed under the display screen 120 in an inclined manner, the optical fingerprint sensor 320 is disposed under the fingerprint detection area 203 in an inclined manner, and the light receiving surface of the optical fingerprint sensor 320, that is, the surface of the light detection array 321 is disposed towards the fingerprint detection area 203, at this time, the fingerprint light signal reflected or scattered by the fingerprint detection area 203 can be received to the greatest extent, thereby improving the fingerprint imaging quality and the fingerprint recognition effect.
Alternatively, the optical assembly 310 may be disposed in parallel below the display screen 120, or, like the optical fingerprint sensor, also obliquely below the display screen 120. Alternatively, the optical component 310 may be disposed obliquely below the fingerprint detection area 203.
For example, as shown in fig. 3, the fingerprint detection area 203 is located at the upper right of the optical component 310 and the optical fingerprint sensor 320, and at this time, the left end of the optical fingerprint sensor 320 is higher than the right end, and the light receiving surface thereof is disposed toward the upper right, i.e., toward the fingerprint detection area 203.
Here, when the right end of the optical fingerprint sensor 320 is higher than the left end and the light receiving surface thereof is disposed to the upper left, the fingerprint detection area 203 is located at the fingerprint recognition device 300, i.e., at the upper left of the optical component 310 and the optical fingerprint sensor 320.
Optionally, as shown in fig. 3, the angle between the plane of the optical fingerprint sensor 320 and the plane of the display screen is ω, that is, the angle between the plane of the light detection array 321 and the plane of the display screen is ω, and when the display screen is located on the horizontal plane, the angle between the optical fingerprint sensor 320 and the horizontal plane is ω, where 0 ° < ω < 90 °. For convenience of description, an angle between a plane in which the optical fingerprint sensor 320 is located and a plane in which the display screen is located will be referred to as an inclination angle of the optical fingerprint sensor hereinafter.
Alternatively, as shown in fig. 3, the fingerprint optical signal 301 is an optical signal inclined by an angle θ with respect to the display screen, where the inclination angle θ is an angle between a propagation direction of the fingerprint optical signal 301 and a first direction, and the first direction is a direction perpendicular to the display screen, and 0 ° < θ < 90 °. For convenience of description, the inclined fingerprint optical signals hereinafter refer to optical signals not perpendicular to the plane of the display screen, and the inclined angle of the inclined fingerprint optical signals is an included angle between the propagation direction of the optical signals and the perpendicular direction perpendicular to the surface of the display screen.
As shown in fig. 3, when the display screen 120 is located on a horizontal plane, the inclination angle of the fingerprint light signal is θ, the inclination angle of the optical fingerprint sensor 320 is ω, and θ > ω, the incident angle of the fingerprint light signal 301 with respect to the optical fingerprint sensor 320 is θ—ω, which is the included angle of the fingerprint light signal 301 with respect to the second direction, wherein the second direction is a direction perpendicular to the optical fingerprint sensor 320.
As can be seen from the above formula (1), the light intensity of the fingerprint light signal 301 is I 0 At this time, the optical intensity I of the optical signal received by the optical fingerprint sensor 320 e The calculation formula (2) of (2) is:
I e ′＝I 0 ×cos 4 (θ -. Omega.) equation (2)
For the optical fingerprint signal with the inclination angle theta, when the optical fingerprint sensor is not obliquely arranged, namely, is arranged below the display screen in parallel as shown in fig. 2, the intensity of the optical signal received by the optical fingerprint sensor is shown as formula (1), I e ＝I 0 ×cos 4 θ. When the optical fingerprint sensor is obliquely placed (the inclination angle is omega), the intensity of the optical signal received by the optical fingerprint sensor is shown as formula (2), I e ＝I 0 ×cos 4 (θ - ω) due to θ>Omega, and omega>0 DEG, thus, after being obliquely placedThe intensity of the optical signal received by the optical fingerprint sensor is greater than the intensity of the optical signal received by the optical fingerprint sensor before being obliquely placed.
For example, when the inclination angle θ=50° of the fingerprint light signal, the optical fingerprint sensor is not placed obliquely, i.e., ω=0°, I e ＝0.17×I 0 . The optical fingerprint sensor is placed at an angle of 30 °, i.e. ω=30°, I e ＝0.78×I 0 . Thus, the optical fingerprint sensor receives an increase in optical signal intensity of about 4.6 times after being placed at an inclination of 30 °.
As shown in fig. 4, when the display 120 is located on a horizontal plane, the inclination angle of the fingerprint light signal is θ, the inclination angle of the optical fingerprint sensor 320 is ω, and θ=ω, the fingerprint light signal 301 is incident at an angle of 0 ° with respect to the optical fingerprint sensor 320, that is, the fingerprint light signal 301 is incident perpendicular to the optical fingerprint sensor 320, and at this time, the light intensity I of the light signal received by the optical fingerprint sensor 320 e ＝I 0 。
For example, when the inclination angle θ=50° of the fingerprint light signal, the optical fingerprint sensor is not placed obliquely, I e ＝0.17×I 0 When the optical fingerprint sensor is placed at an inclination of 50 ° (ω=50°), I e ＝I 0 At this time, the intensity of the optical signal received by the optical fingerprint sensor increases by about 5.88 times.
As shown in fig. 5, when the display screen 120 is located on a horizontal plane, the inclination angle of the fingerprint light signal is θ, the inclination angle of the optical fingerprint sensor 320 is ω, and θ < ω, the incident angle of the fingerprint light signal 301 with respect to the optical fingerprint sensor 320 is ω - θ, which is also the included angle of the fingerprint light signal 301 with respect to the second direction, wherein the second direction is a direction perpendicular to the optical fingerprint sensor 320.
As can be seen from the above formula (1), the light intensity of the fingerprint light signal is I 0 At the time, the optical intensity I of the optical signal received by the optical fingerprint sensor e The calculation formula (3) of (2) is:
I e ″＝I 0 ×cos 4 (ω-θ)＝I 0 ×cos 4 (θ -. Omega.) equation (3)
Since cos (ω - θ) =cos (θ - ω), when θ < ω, the calculation formula (3) of the intensity of the optical signal received by the optical fingerprint sensor may be the same as the calculation formula (2). Based on the above analysis, for the same fingerprint optical signal (tilt angle θ), the intensity of the optical signal received by the optical fingerprint sensor after the tilt placement is greater than the intensity of the optical signal received by the optical fingerprint sensor before the tilt placement.
Therefore, when the optical fingerprint sensor is placed at a certain included angle with the plane where the display screen is located, namely, is placed below the display screen in a non-parallel manner, for oblique optical signals with the same light intensity, compared with the optical signals placed below the display screen in a parallel manner, the intensity of the optical signals received by the optical fingerprint sensor can be greatly improved, so that the fingerprint imaging quality and the fingerprint identification effect are improved.
When 0 ° < ω+.ltoreq.θ, the optical intensity of the optical signal received by the optical fingerprint sensor increases and the thickness variation of the optical fingerprint sensor is small as compared with the parallel arrangement of the optical fingerprint sensor (ω=0°), improving the performance of the fingerprint recognition device while not affecting the thickness of the fingerprint recognition device 300.
In particular, when ω=θ, the fingerprint optical signal is perpendicularly incident on the optical fingerprint sensor, the optical fingerprint sensor receives the optical signal having the greatest intensity, and the fingerprint imaging quality and fingerprint recognition effect are optimal.
Here, the setting of the inclination angle ω of the optical fingerprint sensor 320 is related to the inclination angle θ of the fingerprint light signal that the fingerprint recognition device 300 needs to receive, and in the fingerprint recognition system, various factors such as the structure and the position of the optical element in the optical component 310 in the fingerprint recognition device 300, the distance between the optical component 310 and the optical fingerprint sensor 320, and the distance between the optical component 310 and the screen affect the angle of the fingerprint light signal received by the fingerprint recognition device 300. Alternatively, when the inclination angle θ of the fingerprint light signal received by the fingerprint recognition device is equal to or less than 30 °,0 ° < ω is equal to or less than 30 °.
Optionally, as shown in fig. 3, the fingerprint recognition device 300 may further include a supporting structure 330, and the optical fingerprint sensor 320 may be disposed under the display screen in a non-parallel manner, i.e., at an angle with respect to the plane of the display screen, through the supporting structure 330.
Alternatively, the support structure 330 may be an injection molded material including, but not limited to, polycarbonate, resin, polymethyl methacrylate, and the like.
Optionally, the support structure 330 may also be a metallic material including, but not limited to, copper, aluminum, or other alloy materials, and the like.
Alternatively, the supporting structure 330 may be a plastic material or any other solid material with supporting function, and the material of the supporting structure is not specifically limited in the embodiments of the present application.
Specifically, the support structure 330 can be disposed on a substrate that fixedly supports the fingerprint recognition device 300, including but not limited to a center frame of a mobile phone. The support structure 330 may be disposed on the substrate by a process including, but not limited to: injection molding, engraving, lithography, etching, laser machining, etc.
Alternatively, the supporting structure 330 may be integrally formed with the substrate, or may be independently formed, and connected and fixed to the substrate by a connecting device, which is not limited in the processing technology and the specific form of the supporting structure in the embodiment of the application.
Alternatively, in one possible implementation, as shown in fig. 6, the optical assembly 310 may include: the lens assembly includes at least one optical lens for receiving the fingerprint optical signal 301 for fingerprint imaging, and an optical fingerprint sensor for receiving the imaged optical signal and forming a corresponding electrical signal for fingerprint identification.
Alternatively, the surface of the optical lens may be spherical or aspherical. Alternatively, the material of the optical lens may be a transparent material such as glass, resin, or the like.
Alternatively, when the lens assembly includes a plurality of optical lenses, the plurality of optical lenses may each be a spherical lens or each be an aspherical lens, or may include both a spherical lens and an aspherical lens, which is not limited by the embodiment of the present application.
Optionally, the lens assembly further comprises an aperture stop. The aperture diaphragm is formed in the light path of the at least one optical lens and is used for matching with the at least one optical lens to perform optical fingerprint imaging.
Alternatively, the aperture stop may be located on the primary optical axis of the optical lens.
Alternatively, the aperture stop may be located at the object side focus or the image side focus of the optical lens.
Optionally, the plurality of optical lenses in the lens assembly are arranged parallel to each other, i.e. the focal planes of the plurality of optical lenses are parallel to each other, and the main optical axes of the plurality of optical lenses are located on the same line.
Alternatively, the lens assembly may be fixed to the optical fingerprint sensor by a fixing assembly, for example, the fixing assembly may include a lens holder for setting and fixing in the lens barrel, and a lens barrel for connecting and fixing the lens barrel to the optical fingerprint sensor. Alternatively, the fixing component may further include a bracket, a glue layer, and the like, which is not limited in the embodiment of the present application.
Alternatively, in an embodiment of the present application, the optical axis of the optical lens is perpendicular to the optical fingerprint sensor 320, in other words, the focal plane of the optical lens is parallel to the optical fingerprint sensor 320.
When the plane of the optical fingerprint sensor 320 is disposed at ω with the plane of the display screen 120, the focal plane of the optical lens is also disposed at ω with the display screen 120.
When the number of the optical lenses is plural, the angles between the focal planes of the optical lenses and the display screen 120 may be ω, i.e. the optical lenses and the optical fingerprint sensor 320 are all disposed under the display screen 120 in non-parallel.
Alternatively, the direction of the fingerprint light signal 301 received by the optical lens may be parallel to the main optical axis direction of the lens. If the fingerprint optical signal 301 is transmitted to the optical fingerprint sensor 320 through the optical center of the optical lens, the direction of the optical signal received by the optical fingerprint sensor 320 is the same as the direction of the fingerprint optical signal 301, and the inclination angles are all θ.
Alternatively, in another possible embodiment, as shown in fig. 7, the optical assembly 310 may include: a microlens array 311 and at least one light blocking layer 312.
The at least one light blocking layer 312 is located below the microlens array 311 and is provided with a plurality of light-passing holes;
the micro lens array 311 is configured to receive the fingerprint optical signal 301 and collect the fingerprint optical signal 301 to a plurality of light holes;
the plurality of light passing apertures are used to transmit the fingerprint light signal 301 to the optical fingerprint sensor 320, and in particular, to transmit the fingerprint light signal 301 to the light detection array 321 in the optical fingerprint sensor 320.
Alternatively, the microlens array 311 includes a plurality of microlenses, which may be spherical or aspherical lenses.
Optionally, the light detection array 321 includes a plurality of pixel units, and the microlenses in the microlens array 311 are in one-to-one correspondence with the pixel units in the light detection array 321, i.e. one microlens is configured to receive the light signal above the microlens and transmit the light signal to one pixel unit corresponding to the microlens through the light passing hole on the at least one light blocking layer.
Optionally, when the optical component 310 includes a light blocking layer, one microlens corresponds to one light transmitting aperture and one pixel unit. The center of the microlens, the center of the light passing aperture, and the center of the pixel unit may coincide in a direction perpendicular to the pixel unit.
Optionally, when the optical component 310 includes at least two light blocking layers, for example, two light blocking layers including a first light blocking layer and a second light blocking layer, one microlens in the microlens array corresponds to one first light passing aperture on the first light blocking layer and one second light passing aperture on the second light blocking layer, and one pixel unit. Similarly, the center of the microlens, the center of the first light passing aperture, the center of the second light passing aperture, and the center of the pixel unit may coincide in a direction perpendicular to the pixel unit.
Alternatively, the microlens array 311 may be used to receive an optical signal incident perpendicular to the microlens array 311. The fingerprint light signal 301 returned after being reflected or scattered by the finger above the display screen may be a light signal incident perpendicular to the microlens array 311.
Alternatively, the material of the microlens array 311 is a transparent medium, and the light transmittance of the transparent medium is greater than 99%, such as a resin or the like.
Alternatively, the microlenses in the microlens array 311 are polygonal lenses, such as square lenses or hexagonal lenses, and may be circular lenses. For example, when the microlens is a quadrangular lens, the upper surface of the quadrangular lens is spherical or aspherical, and the lower surface of the quadrangular lens is quadrangular.
Specifically, the at least one light blocking layer 312 has a transmittance of less than 20% for light in a specific wavelength band (such as visible light or a wavelength band above 610 nm), so as to avoid the corresponding light passing therethrough. Optionally, the material of the at least one light blocking layer 312 may be metal and/or black opaque material.
Optionally, the light-passing apertures on the at least one light-blocking layer 312 are circular apertures having a diameter less than 10 μm for optical imaging, and the resolution of the optical imaging can be increased by reducing the size of the light-passing apertures, thereby increasing the resolution of the fingerprint image.
Optionally, the shape of the light-passing hole on at least one light-blocking layer may be polygonal or other shapes, which is not limited in the embodiment of the present application.
Optionally, the microlens array 311 and the at least one light blocking layer 312 may be encapsulated in the optical fingerprint sensor together with the light detecting array 321, specifically, the at least one light blocking layer 312 may be prepared on a plurality of pixel units of the light detecting array 321 by a micro-nano processing process or a nano printing process, for example, a micro-nano processing process is adopted to prepare a layer of non-light transmitting material film above the plurality of pixel units by atomic layer deposition, sputtering coating, electron beam evaporation coating, ion beam coating and the like, and then small hole pattern lithography and etching are performed to form a plurality of light transmitting small holes.
Optionally, the light detection array 321 is isolated from the light blocking layer and the multiple light blocking layers by transparent dielectric layers. The transparent dielectric layer is made of organic or inorganic transparent dielectric materials, such as resin or silicon oxide.
In the embodiment of the application, the micro lens array 311 and the at least one light blocking layer 312 are disposed in parallel above the optical fingerprint sensor, i.e. the micro lens array 311 and the at least one light blocking layer 312 are not parallel, i.e. are disposed obliquely below the display screen.
Optionally, an included angle between a plane of each light blocking layer of the at least one light blocking layer 312 and a plane of the display screen is ω. The angle between the lower surface of the microlens array 311 and the plane of the display screen is also ω.
Optionally, in the above various embodiments, the fingerprint recognition apparatus 300 may further include: the filtering layer is used for filtering out the optical signals of the non-target wave band, and transmitting the optical signals of the target wave band (namely, the optical signals of the wave band required by fingerprint image acquisition), thereby being beneficial to reducing the influence of the environment optical signals of the non-target wave band and further improving the fingerprint identification performance.
Optionally, a filter layer is disposed in the optical path between the display 120 and the optical fingerprint sensor 320. For example, the filter layer may be disposed between the display screen 120 and the optical component 310, or disposed in the optical component 310, or may also be disposed between the optical component 310 and the optical fingerprint sensor 320.
When the optical component 310 includes the microlens array 311 and at least one light blocking layer 312, optionally, the lower surface of the filter layer is completely adhered to the upper surface of the microlens array 311 through the adhesive layer, and there is no air layer between the filter layer and the microlens array 310. Alternatively, the adhesive layer may be a low refractive index glue having a refractive index of less than 1.25.
Optionally, a filter layer may be fixed above the microlens array 310 by a low refractive index glue or other fixing means, and a lower surface of the filter layer has a certain air gap with an upper surface of the microlens array 310.
Alternatively, the filter layer may be laminated over the optical fingerprint sensor 320 by a laminating adhesive having a high transmittance and a low refractive index.
Alternatively, the filter layer may also be integrated in a chip of the optical fingerprint sensor 320, and in particular, the filter layer may be formed by performing a plating process on a plurality of pixel units of the optical fingerprint sensor 320, for example, by preparing a layer of filter material film over the plurality of pixel units by atomic layer deposition, sputtering, electron beam evaporation, ion beam plating, or the like.
In the embodiment of the application, the filter layer may be a visible light filter, and may be specifically used for filtering out visible light wavelengths, for example, visible light for image display, and the like. The visible light filter may in particular comprise one or more optical filters, which may be configured as, for example, a bandpass filter, to filter out light emitted by the visible light source while not filtering out the infrared light signal. 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 appreciated that the filter layer may be fabricated on the surface of any optical component or along an optical path to the optical fingerprint sensor 320 via reflected light formed by finger reflection. Optionally, the filter layer may also be provided in a film layer structure in the display 120.
Alternatively, in the above-described various embodiments of the present application, the display screen may be an organic light emitting diode display screen (OLED) or a liquid crystal display screen (LCD). If the display screen is an OLED display screen, the fingerprint light signal is a light signal formed by reflecting or scattering excitation light emitted by part of display units of the OLED display screen on fingers above the OLED display screen and returned. If the display screen is an LCD display screen comprising a backlight module, the fingerprint light signal is a light signal formed by reflecting or scattering infrared excitation light emitted by an external light source to fingers above the LCD display screen, and then refracting the infrared excitation light through one of the first prism film side surface and the second prism film side surface of the prism film of the backlight module.
Specifically, as shown in fig. 8, the lcd 120 includes a liquid crystal panel 122, a backlight module 123 and a glass cover 124. Specifically, the backlight module 123 includes a prism film 124 and other backlight module structures 125, wherein the other backlight module structures 125 include, but are not limited to, a polarizer, a diffuser, a light guide plate, and a reflector. Specifically, fig. 9a and 9b show a perspective view and a cross-sectional view of a prism film 124 according to an embodiment of the present application, the prism film 124 is formed by regularly arranging a plurality of identical prism units 1240 on a substrate 1243, wherein each prism unit 1240 is formed by protruding upward from the substrate 1243, and each prism unit 1240 has a structure having two inclined sides with a single source, and an included angle is formed between the two inclined sides, which is a vertex angle (apex angle) of the prism unit 1240. For example, as shown in fig. 9b, the prism unit 1240 has a triangular cross section, and the prism unit 1240 has a structure similar to a triangular prism. Specifically, the inclined sides of the plurality of prism units 1240 are connected to form the upper surface of the prism film 124, wherein, as shown in fig. 9a and 9b, two inclined sides of the prism units 1240 are respectively a first inclined side unit 1241 and a second inclined side unit 1242, the plurality of first inclined side units 1241 and the plurality of second inclined side units 1242 are disposed at intervals from each other, and a plurality of first inclined side units 1241 parallel to each other and a plurality of second inclined side units 1242 parallel to each other in the prism film 124 are formed. The plurality of first inclined side units 1241, which are parallel to each other, are first prism film sides of the prism film 124, and the plurality of second inclined side units 1242, which are parallel to each other, are second prism film sides of the prism film 124.
As shown in fig. 8, the fingerprint recognition device 200 includes an optical lens, an aperture stop, and an optical fingerprint sensor. When the fingerprint recognition device 200 is disposed in parallel below the lcd 120, the fingerprint light signals reflected or scattered by the finger are respectively refracted by the first prism film side and the second prism film side of the prism film 124 into light signals in different directions, where the fingerprint light signals at the edge of the fingerprint detection area 203 are refracted by the prism film, for example, the fingerprint light signals 204 enter the optical fingerprint sensor to form an image through the aperture diaphragm, and the fingerprint light signals at the center of the fingerprint detection area 203 are refracted by the prism film, for example, the fingerprint light signals 205 cannot enter the optical fingerprint sensor to form an image through the aperture diaphragm, so that shadow stripes as shown in fig. 10 are formed in the fingerprint image detected by the optical fingerprint sensor, resulting in serious field loss and distortion of the fingerprint image, and the fingerprint recognition function under the lcd cannot be realized.
Therefore, in the case that the display screen is a liquid crystal display screen, the fingerprint identification device in the embodiment of the application is arranged below the liquid crystal display screen in a non-parallel manner, so that fingerprint light signals of all areas in the fingerprint detection area can pass through the aperture diaphragm after being refracted through one of the first prism film side surface and the second prism film side surface in the prism films, and therefore, the optical fingerprint sensor can detect that no shadow exists in a formed fingerprint image, and the fingerprint identification device positioned below the liquid crystal display screen is convenient for fingerprint identification.
Fig. 11 shows a schematic structural diagram of another fingerprint recognition device 300, where the fingerprint recognition device 300 is disposed below a liquid crystal display screen, and includes: an optical component 310 and an optical fingerprint sensor 320.
Wherein the optical assembly 310 comprises an aperture stop 313 and an optical lens 314. Alternatively, as shown in fig. 11, the aperture stop 313 is located above the optical lens 314, performs optical fingerprint imaging together with the optical lens, and transmits a fingerprint light signal to the optical fingerprint sensor 320.
Optionally, the aperture stop 313 is located on the primary optical axis of the optical lens 314.
Alternatively, the aperture stop 313 may be located at the object focus of the optical lens 314.
Specifically, the optical fingerprint sensor 320 is disposed obliquely below the liquid crystal display, for example, as shown in fig. 11, the optical fingerprint sensor 320 is inclined at an angle ω of 0 ° < ω <90 °.
Optionally, as shown in fig. 11, the fingerprint recognition device 300 further includes: the support structure 330 is used for supporting and fixing the optical fingerprint sensor 320 to be arranged under the display screen in a non-parallel manner. Specifically, the specific implementation of the support structure 330 may be referred to the description of the support structure 330 in the above application embodiments, which is not repeated herein.
Optionally, the optical component 310 is also disposed obliquely below the liquid crystal display. For example, as shown in fig. 11, the focal plane of the optical lens 314 is parallel to the optical fingerprint sensor 320, or the tilt angle of the optical lens 314 is also ω.
Optionally, in an embodiment of the present application, the optical assembly 310 may further include a plurality of optical lenses, which may be spherical lenses or aspherical lenses, and the aperture stop 314 is formed in the optical paths of the plurality of optical lenses.
Alternatively, the optical assembly 310 is positioned such that the optical assembly 310 receives only an optical signal formed after being refracted through one of the first and second prism film sides of the prism films 124, and does not receive an optical signal after being refracted through the other of the prism film sides of the prism films 124.
Specifically, the position of the aperture 313 in the optical component 310 is such that the aperture 313 only reflects or scatters by a finger above the fingerprint detection area 203, and then refracts the fingerprint light signal formed by one of the prism films through the side of the prism film. For example, as shown in fig. 11, the fingerprint light signal 301 refracted by the side surface of the second prism film may enter the optical lens 314 and the optical fingerprint sensor 320 through the aperture 313 for imaging, while the fingerprint light signal refracted by the side surface of the first prism film may not pass through the aperture 313 for imaging.
Alternatively, the optical fingerprint sensor 320 may be positioned such that the optical fingerprint sensor 320 receives only the optical signal formed after being refracted through one of the first prism film side and the second prism film side of the prism films 124, but does not receive the optical signal after being refracted through the other of the prism film 124.
According to the scheme provided by the embodiment of the application, the optical fingerprint sensor 320 is obliquely arranged, so that the optical fingerprint sensor 320 can receive fingerprint light signals of all areas in the fingerprint detection area, fingerprint imaging is carried out on the fingerprint detection area, no dark stripes are detected in the detected fingerprint image, fingerprint identification under a liquid crystal display can be realized, in addition, the light intensity of the fingerprint light signals received by the optical fingerprint sensor 320 can be increased, and the fingerprint image quality and fingerprint identification effect can be further improved.
Fig. 12 shows a schematic structural diagram of another fingerprint recognition device 300, where the fingerprint recognition device 300 is also disposed below a liquid crystal display screen, and includes: an optical component 310 and an optical fingerprint sensor 320.
The optical component 310 is disposed in parallel under the lcd. For example, the principal optical axis of the optical lens 314 in the optical assembly 310 is perpendicular to the surface of the liquid crystal display, and the aperture stop 314 is located on the principal optical axis of the optical lens 314.
The optical fingerprint sensor 320 is also disposed in parallel under the lcd 120, but obliquely below the optical element 310. For example, as shown in fig. 12, when the optical fingerprint sensor 320 is located at the lower left side of the optical component 310, the fingerprint detection area 203 corresponding to the optical fingerprint sensor 320 is located at the upper right side of the optical component, the optical fingerprint sensor 320 is configured to receive the fingerprint light signal in the fingerprint detection area 203, and the fingerprint light signal is refracted by the side surface of the second prism film of the prism films 124 and then enters the aperture stop 313, and the fingerprint light signal is refracted by the side surface of the first prism film of the prism films 124 and then cannot enter the aperture stop 313.
Similarly, when the optical fingerprint sensor 320 is located at the lower right side of the optical component 310, the fingerprint detection area 203 corresponding to the optical fingerprint sensor 320 is located at the upper left side of the optical component, and the optical fingerprint sensor 320 is configured to receive the fingerprint light signal in the fingerprint detection area 203, where the fingerprint light signal is refracted by the side of the first prism film of the prism films 124 and then enters the aperture stop 313, and the fingerprint light signal is refracted by the side of the second prism film of the prism films 124 and then cannot enter the aperture stop 313.
Alternatively, as shown in fig. 12, the fingerprint detection area 203 is located on one side of the optical axis of the optical component 310.
Optionally, the Field Of View (FOV) area Of the optical assembly 310 is greater than the fingerprint detection area 203, and the fingerprint optical signal received by the optical fingerprint sensor 320 is a portion Of the optical signal transmitted by the optical assembly 310. Specifically, in the embodiment of the present application, the field of view of the optical component 310 is the field of view of the optical component 310 in the lcd.
Optionally, the fingerprint detection area 203 is located at an edge region of the field of view of the optical assembly 310. The field of view edge region of the optical component 310 is located in the field of view region of the optical component 310, and the distance between the center of the field of view edge region and the center of the field of view region is greater than or equal to a first threshold, for example, the first threshold is 4/5 of the radius of the field of view region, it should be understood that the first threshold may also be 3/4 of the radius of the field of view region or any other value, and the embodiment of the present application is not limited in this respect.
Optionally, the optical component 310 does not overlap with the projection of the fingerprint detection area 203 onto the plane of the optical fingerprint sensor 320.
It should be understood that the optical component 310 and the projection of the fingerprint detection area 203 on the plane of the optical fingerprint sensor 320 may also have an overlapping area, but the optical fingerprint sensor 320 cannot simultaneously receive the fingerprint light signals refracted by the two prism film sides of the prism film.
Optionally, the fingerprint detection area 203 is located on one side of the optical axis of the optical component 310, and the optical fingerprint sensor 320 is disposed on the other side of the optical axis of the optical component 310.
Optionally, in one possible implementation, optical assembly 310 is a super wide angle lens group including one or more super wide angle lenses therein. Optionally, the field of view of the ultra-wide angle lens group is larger than the fingerprint detection area 203. Optionally, the ultra-wide angle lens group has a field angle ranging from 120 ° to 180 °.
Optionally, the fingerprint detection area 203 is a square of 5cm x 5cm or more.
Optionally, the object focal length of the optical component 310, also referred to as the front focal length of the optical component 310, is increased, thereby increasing the distance of the optical component 310 from the fingerprint detection area 203 to enlarge the field of view of the optical component 310. By expanding the field of view of the optical assembly 310 and increasing the area of the optical fingerprint sensor 320, the area of the fingerprint detection area 203 can be increased, thereby increasing the area of the fingerprint image and improving the performance of the fingerprint recognition.
Specifically, fig. 13 shows a schematic diagram of calculating the inclination angle ω of the optical fingerprint sensor 320 when the optical fingerprint sensor 320 under the liquid crystal display is disposed obliquely. The optical fingerprint sensor 320 in fig. 13 may be the optical fingerprint sensor 320 in fig. 11, and the aperture stop 313 may be the aperture stop 313 in fig. 11.
As shown in fig. 13, the optical fingerprint sensor 320' is disposed parallel to the lcd, and the corresponding fingerprint recognition area is located directly above the optical fingerprint sensor 320', in which case, a shadow area appears in the center of the fingerprint image formed by the optical fingerprint sensor 320', for specific reasons, see the related description of fig. 8, which will not be repeated here.
Wherein the distance from the aperture stop 313 to the optical fingerprint sensor 320' is d, d >0.l is the length or width of the photosensitive area in the optical fingerprint sensor, and l >0, in particular, l may be the length or width of the light detection array 321. Beta is the divergence angle of the shadow region in the fingerprint image produced by the optical fingerprint sensor 320', beta >0, which is related to the structure of the optical assembly 310, the distance of the optical assembly 310 from the optical fingerprint sensor, the structure of the prismatic film, etc. After determining relevant parameters of the fingerprint identification system, the divergence angle of the shadow area in the fingerprint image can be determined by the width of the shadow area and the distance from the aperture stop 313 to the optical fingerprint sensor 320 'when the optical fingerprint sensor 320' is placed in parallel.
In order to avoid shadows in the fingerprint image formed by the optical fingerprint sensor, the optical fingerprint sensor is rotated to the position of the optical fingerprint sensor 320 in fig. 13, and the inclination angle of the optical fingerprint sensor 320 is ω, when 90 ° >ω>At β/2+arctan (l/d), no shadows appear in the fingerprint image formed by the optical fingerprint sensor 320.
It should be understood that fig. 13 shows a schematic rotation diagram of the optical fingerprint sensor in one direction only, and the fingerprint sensor may also rotate around the aperture stop 313 as a rotation center in other directions, so that no shadows appear in a fingerprint image formed by the optical fingerprint sensor.
It should also be understood that, in the embodiment of the present application, when the optical fingerprint sensor rotates, the optical component in the fingerprint recognition device rotates together with the optical fingerprint sensor, in other words, the optical component in the fingerprint recognition device is disposed parallel to the optical fingerprint sensor, and when the optical fingerprint sensor is disposed at an angle with the display screen, the optical component is also disposed at an angle with the display screen.
Specifically, fig. 14 shows a schematic diagram of calculation of the moving distance c of the optical fingerprint sensor 320 when the optical fingerprint sensor 320 under the liquid crystal display is placed obliquely under the optical assembly 310. The optical fingerprint sensor 320 in fig. 14 may be the optical fingerprint sensor 320 in fig. 12, and the aperture stop 313 may be the aperture stop 313 in fig. 12.
As shown in fig. 14, the optical fingerprint sensor 320' is disposed parallel to the lcd, and the corresponding fingerprint recognition area is located directly above the optical fingerprint sensor 320', in which case, a shadow area appears in the center of the fingerprint image formed by the optical fingerprint sensor 320', for specific reasons, see the related description of fig. 8, which will not be repeated here.
Wherein the distance from the aperture stop 313 to the optical fingerprint sensor 320' is d, d >0.l is the length or width of the photosensitive area in the optical fingerprint sensor, and l >0, in particular, l may be the length or width of the light detection array 321. Beta is the divergence angle of the shadow region in the fingerprint image produced by the optical fingerprint sensor 320', beta >0.
In order to avoid shadows in the fingerprint image formed by the optical fingerprint sensor, the optical fingerprint sensor is shifted to the position of the optical fingerprint sensor 320 in fig. 14, at this time, the shift distance of the optical fingerprint sensor 320 is c, and when c > l+d×arctan (β/2), no shadows occur in the fingerprint image formed by the optical fingerprint sensor 320.
It should be noted that, in the embodiment of the present application, when the position of the optical component in the fingerprint recognition device is kept unchanged, the optical fingerprint sensor translates by the distance c, so that the optical fingerprint sensor is located obliquely below the optical component, but not directly below the optical component.
It should be appreciated that only a schematic of a translation of the optical fingerprint sensor in one direction is shown in fig. 14, but the fingerprint sensor may also translate in other directions such that no shadows appear in the fingerprint image formed by the optical fingerprint sensor.
Optionally, when the display screen is a liquid crystal display screen, as shown in fig. 15, the fingerprint recognition device 300 further includes: an infrared light source 340 for providing infrared excitation light for fingerprint detection of the fingerprint recognition device 300, the infrared excitation light being irradiated to at least part of a display area of the liquid crystal display, the at least part of the display area at least partially covering the fingerprint detection area of the fingerprint recognition device 300.
Alternatively, the infrared light source 340 may be disposed below the glass cover 121 of the electronic device, side by side with the liquid crystal panel 122 of the liquid crystal display, and obliquely above the backlight module 123 of the liquid crystal display.
Alternatively, the infrared light source 340 may be obliquely attached below the glass cover plate 121. For example, the infrared light source 340 may be obliquely attached under the display screen by an optical adhesive. Alternatively, the optical cement may be any optical liquid cement or optical solid cement.
Optionally, an infrared light transmitting layer 341 may be disposed between the infrared light source and the glass cover plate and/or between the infrared light source and the liquid crystal display screen, and the infrared light transmitting layer 341 is configured to transmit infrared excitation light and block visible light. Alternatively, the infrared light transmitting layer 341 may be an infrared light transmitting ink.
Optionally, as shown in fig. 15, a light blocking foam 342 may be disposed between the infrared light source 340 and the liquid crystal panel 122 in the liquid crystal display screen, for blocking visible light.
Optionally, the infrared light source is disposed at a non-display area of an edge of the electronic device.
Alternatively, the infrared light source may be a single or multiple light-emitting diodes (LEDs). Alternatively, a plurality of infrared light emitting diodes may constitute a strip-shaped infrared light source distributed around the fingerprint recognition device 300.
As shown in fig. 16, the embodiment of the present application further provides an electronic device 30, where the electronic device 30 may include the fingerprint recognition device 300 in the embodiment of the application.
Optionally, the electronic device 30 may also include a display 120. Alternatively, the display 120 may be a liquid crystal display or an organic light emitting diode display.
Optionally, when the display screen is a liquid crystal display screen, the electronic device 30 may also include an infrared light source. The infrared light source may be the same as the infrared light source 340 in fig. 15, and the related technical solutions may be referred to the above description, which is not repeated here.
It should be understood that the specific examples of the embodiments of the present application are intended to facilitate a better understanding of the embodiments of the present application by those skilled in the art, and are not intended to limit the scope of the embodiments of the present application.
It is to be understood that the terminology used in the embodiments of the application and in the appended claims is for the purpose of describing particular embodiments only, and is not intended to be limiting of the embodiments of the application. For example, as used in the embodiments of the application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Those of ordinary skill in the art will appreciate that the elements of the examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the elements and steps of the examples have been described above generally in terms of functionality for clarity of understanding of interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. 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 system and apparatus may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices, or elements, or may be an electrical, mechanical, or other form of connection.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment of the present application.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application is essentially or a part contributing to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
While the application has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (23)

1. A fingerprint recognition device adapted for use with an electronic device having a display screen for off-screen optical fingerprint detection, the fingerprint recognition device comprising:
the optical fingerprint sensor is used for being arranged below the display screen in a mode of being non-parallel to the display screen;
the optical component is arranged above the optical fingerprint sensor and comprises at least one lens and a small aperture diaphragm, and is used for transmitting a fingerprint light signal returned after being reflected or scattered by a finger above the display screen to the optical fingerprint sensor for fingerprint identification, wherein the fingerprint light signal is an optical signal inclined relative to the display screen;
the display screen is a liquid crystal display screen with a backlight module;
The included angle between the plane of the optical fingerprint sensor and the plane of the display screen is omega, wherein 90 degrees is more than omega > beta/2+arctan (l/d), l is 1/2 of the length of the optical fingerprint sensor, d is the distance from the aperture diaphragm to the optical fingerprint sensor, and beta is the divergence angle of a shadow area determined according to the prism film of the backlight module.
2. The fingerprint recognition device of claim 1, wherein the display screen includes a fingerprint detection area, the optical assembly being configured to transmit the fingerprint light signal returned after reflection or scattering by a finger over the fingerprint detection area;
the optical fingerprint sensor faces the fingerprint detection area and is arranged obliquely below the fingerprint detection area.
3. Fingerprint recognition device according to claim 1, characterized in that 0 ° < ω < 90 °.
4. A fingerprint recognition device according to claim 3, wherein 0 ° < ω < 30 °.
5. A fingerprint recognition device according to claim 3, wherein the angle of incidence of the fingerprint light signal with respect to the optical fingerprint sensor is θ - ω, wherein θ - ω is the angle of the fingerprint light signal from the vertical plane of the optical fingerprint sensor, θ is the angle of the fingerprint light signal from the vertical plane of the display screen, and 0 ° < θ < 90 °.
6. A fingerprint recognition device according to claim 3, wherein ω = θ, where θ is the angle of the fingerprint light signal to the vertical of the display screen, 0 ° < θ < 90 °.
7. The fingerprint recognition device of claim 1, wherein the optical assembly comprises: and the optical lens is used for receiving the fingerprint optical signal to perform fingerprint imaging, and is a spherical or aspheric lens.
8. The fingerprint recognition device of claim 7, wherein the optical assembly further comprises: an aperture stop formed in the optical path of the at least one optical lens.
9. The fingerprint identification device of claim 7, wherein a focal plane of the optical lens is parallel to the optical fingerprint sensor.
10. The fingerprint recognition device according to claim 7, wherein the direction of the fingerprint light signal is parallel to the optical axis of the optical lens.
11. The fingerprint recognition device according to any one of claims 7-10, wherein the at least one optical lens is fixed to the optical fingerprint sensor by a fixing assembly, and wherein neither the at least one optical lens nor the optical fingerprint sensor is arranged in parallel below the display screen.
12. The fingerprint recognition device of any one of claims 1-6, wherein the optical assembly comprises: a microlens array and at least one light blocking layer;
the at least one light blocking layer is positioned below the micro lens array and is provided with a plurality of light passing small holes;
the micro lens array is used for receiving the fingerprint optical signals and converging the fingerprint optical signals to the plurality of light-transmitting small holes;
the plurality of light-passing apertures are used for transmitting the fingerprint light signals to the optical fingerprint sensor.
13. The fingerprint identification device of claim 12, wherein the fingerprint light signal is incident perpendicularly to the microlens array.
14. The fingerprint recognition device of claim 12, wherein the microlens array and the at least one light blocking layer are integrally disposed over the optical fingerprint sensor by a semiconductor process;
the micro lens array, the at least one light blocking layer and the optical fingerprint sensor are all arranged below the display screen in a non-parallel manner.
15. The fingerprint recognition device according to any one of claims 1-10, wherein the optical fingerprint sensor is arranged non-parallel below the display screen by a support structure;
The support structure is made of injection molding materials, plastic materials or metal materials.
16. The fingerprint recognition device according to any one of claims 1-10, wherein the display screen is an organic light emitting diode display screen;
the fingerprint light signal is a light signal formed by reflecting or scattering excitation light emitted by part of display units of the organic light-emitting diode display screen on a finger above the organic light-emitting diode display screen and returned.
17. The fingerprint recognition device according to any one of claims 1-10,
the fingerprint light signal is a light signal formed by reflecting or scattering infrared excitation light emitted by an external light source to fingers above the liquid crystal display screen, returning the infrared excitation light and refracting the infrared excitation light through one of the first prism film side surface and the second prism film side surface of the prism film of the backlight module.
18. The fingerprint recognition device of claim 17, wherein the optical assembly is positioned such that an optical signal refracted through a side of another one of the prismatic films is deflected away from the optical assembly and cannot be transmitted to the optical fingerprint sensor.
19. The fingerprint identification device of claim 17, wherein the optical fingerprint sensor is positioned such that an optical signal refracted through a side of another one of the prismatic films is deflected away from the optical fingerprint sensor.
20. The fingerprint identification device according to any one of claims 1-10, wherein the fingerprint identification device further comprises:
and the filter layer is arranged in the light path between the display screen and the optical fingerprint sensor and is used for filtering out optical signals of non-target wave bands and transmitting the optical signals of the target wave bands.
21. An electronic device, comprising:
a display screen and a fingerprint recognition device according to any one of claims 1 to 20, wherein the fingerprint recognition device is arranged below the display screen for off-screen optical fingerprint detection.
22. The electronic device of claim 21, wherein the display screen is an organic light emitting diode display screen, and wherein the fingerprint light signal is a light signal formed by reflecting or scattering excitation light emitted from a part of display units of the organic light emitting diode display screen on a finger above the organic light emitting diode display screen and returned.
23. The electronic device of claim 21, wherein the display screen is a liquid crystal display screen, the electronic device further comprising:
and the infrared light source is used for providing infrared excitation light for fingerprint detection of the fingerprint identification device, the infrared excitation light irradiates at least part of the display area of the liquid crystal display screen, and the at least part of the display area at least partially covers the fingerprint detection area of the fingerprint identification device.
CN201980002486.3A 2019-10-25 2019-10-25 Fingerprint identification device and electronic equipment Active CN110945527B (en)

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