CN112860120A - Fingerprint identification device, electronic equipment and method for detecting ambient light - Google Patents

Fingerprint identification device, electronic equipment and method for detecting ambient light Download PDF

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Publication number
CN112860120A
CN112860120A CN202110258477.XA CN202110258477A CN112860120A CN 112860120 A CN112860120 A CN 112860120A CN 202110258477 A CN202110258477 A CN 202110258477A CN 112860120 A CN112860120 A CN 112860120A
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China
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area
fingerprint
optical
light
ambient light
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CN202110258477.XA
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Chinese (zh)
Inventor
丘芳芳
何嘉明
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Shenzhen Goodix Technology Co Ltd
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Shenzhen Goodix Technology Co Ltd
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Priority to CN202110258477.XA priority Critical patent/CN112860120A/en
Publication of CN112860120A publication Critical patent/CN112860120A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • 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

Abstract

A fingerprint identification device, an electronic device and an ambient light detection method are provided. The fingerprint identification device includes: an optical path layer for guiding optical signals from N directions of a second area of a fingerprint detection area and optical signals from a first area of the fingerprint detection area to the optical fingerprint sensor; the optical fingerprint sensor is disposed below the optical path layer, and includes a first pixel region for receiving optical signals from the first region and a plurality of second pixel regions for receiving optical signals from the second region in the N directions. The fingerprint identification device can realize the dual detection functions of fingerprint detection and ambient light detection, so that the user experience is improved on the premise of not increasing the cost.

Description

Fingerprint identification device, electronic equipment and method for detecting ambient light
Technical Field
The present application relates to the field of optical fingerprint technology, and more particularly, to a fingerprint identification device, an electronic device, and a method of ambient light detection.
Background
With the popularization of mobile phones, in order to provide better user experience, many mobile phones use an ambient light detection technology to realize some intelligent functions, such as automatically adjusting a keyboard light, screen brightness, and the like, but the realization method usually realizes light sensing by adding a light sensing device on hardware, which increases the cost of the mobile phone.
And the fingerprint recognition device itself is a photosensitive device, therefore, can be through to fingerprint recognition device optimization light path design or hardware design under the screen to realize fingerprint acquisition and the dual function of ambient light detection, then can provide better user experience under the condition that does not increase the hardware cost.
Disclosure of Invention
The embodiment of the application provides a fingerprint identification device, electronic equipment and an ambient light detection method, which can realize dual detection of fingerprint detection and ambient light detection, thereby providing better user experience under the condition of not increasing hardware cost.
In a first aspect, a fingerprint identification device is provided and is arranged below a display screen of an electronic device, a display area of the display screen comprises a fingerprint detection area, and the fingerprint identification device comprises: an optical path layer for guiding optical signals of N directions from a second area of the fingerprint detection area, and optical signals from a first area of the fingerprint detection area to an optical fingerprint sensor, wherein the second area of the fingerprint detection area is disposed around the first area, and N is an integer greater than 1; the optical fingerprint sensor is arranged below the optical path layer and comprises a first pixel area and a plurality of second pixel areas, the plurality of second pixel areas are arranged around the first pixel area, the first pixel area is used for receiving optical signals from the first area, the plurality of second pixel areas are used for receiving optical signals from the N directions of the second areas, and each second pixel area is used for receiving the optical signal in one direction of the N directions; wherein the optical signals of the N directions and the optical signal from the first area are used for generating a current ambient light semaphore.
It should be understood that the first area of the fingerprint detection area in the embodiment of the present application may refer to an area provided on the display screen for pressing the center of the fingerprint, for example, an area provided with the light spot, and the second area may refer to an area provided on the display screen around the area for pressing the fingerprint, for example, an area provided with the light spot, wherein the light signals of the two areas may be received by the fingerprint identification device in the embodiment of the present application, wherein the light signal of the first area is received by the first pixel area, and the light signal of the second area is received by the second pixel area.
It should be understood that the optical signal of the first area in the embodiment of the present application may be a reflected optical signal after being reflected by a finger, or may be an ambient optical signal; the light signal of the second area may be a reflected light signal after reflection by the finger or may be an ambient light signal, and the different forms of the signals are related to whether the finger is pressed or not.
Specifically, the ambient light detection in the embodiment of the present application can be divided into two cases, that is, when a fingerprint is pressed, the optical path layer can guide N-direction optical signals from the second area and an optical signal from the first area to the optical fingerprint sensor, where the N-direction optical signals and the optical signal from the first area can include return optical signals that return after being reflected by a finger and an ambient optical signal that passes through the screen; in the second case, the optical path layer may guide the N-directional light signals from the second area and the light signal from the first area to the optical fingerprint sensor when there is no finger press, wherein the N-directional light signals and the light signal from the first area may include an ambient light signal transmitted through the screen because there is no finger press.
Alternatively, the light semaphore in the embodiment of the present application may refer to an intensity value of the received light signal, i.e. light intensity, which may be calculated from the light signal received by the optical sensing pixel comprised in the fingerprint sensor.
In the technical scheme of this application embodiment, through optimizing fingerprint identification device's light path design, make fingerprint identification device when realizing fingerprint information collection, also can realize the collection of environment light information, thereby need not increase the detection that extra sensitization device just can realize the environment light, then can be under the prerequisite that does not increase the cost, improve user experience, and simultaneously, utilize the light signal of a plurality of not equidirectional to carry out environment light detection, can obtain a plurality of values of light semaphore, obtain current environment light semaphore with a plurality of different values of light semaphore, can improve the precision of environment light detection.
In one possible embodiment, the current ambient light signal level is used to adjust the brightness of the display screen.
In one possible embodiment, the second field of view area corresponding to the plurality of second pixel areas is larger than the first field of view area corresponding to the first pixel area.
Through setting up the pixel area of gathering ambient light information around the pixel area of gathering fingerprint information for the field of vision area of gathering ambient light information is greater than the field of vision area of gathering fingerprint information, thereby can avoid sheltering from of finger, better detects ambient light.
In the technical scheme of this application embodiment, after fingerprint identification device detected ambient light, can utilize the ambient light semaphore that obtains of detection to do further action, for example, can adjust screen brightness according to ambient light semaphore, or adjust keyboard lamp, this application embodiment does not limit to this.
In a possible implementation manner, the plurality of second pixel regions are disposed on different sides of the first pixel region, or the plurality of second pixel regions are disposed on the same side of the first pixel region, or the plurality of second pixel regions are disposed at corners of the first pixel region.
In one possible embodiment, the plurality of second pixel regions are arranged in at least one ring of annular regions around the first pixel region.
In the embodiment of the application, the plurality of second pixel regions may be disposed on different side surfaces of the first pixel region, so that a field of view formed by the second pixel regions may be further increased, or the plurality of second pixel regions may also be disposed on the same side of the first pixel region, and further, each side of the first pixel region may be disposed with the plurality of second pixel regions, so that more ambient light signals may be acquired, and accuracy of ambient light detection is improved.
In a possible implementation, the second pixel region located on the same side of the first pixel region is used for receiving the optical signal in the same direction of the N directions; or, a second pixel region located on the same side of the first pixel region is configured to receive the optical signals in the N directions.
In one possible embodiment, the optical path layer includes: each light blocking layer in the at least one light blocking layer is provided with an aperture array to form light guide channels in the N directions and light guide channels for forming the optical signals from the first area, the light guide channels in the N directions are used for respectively guiding the optical signals in the N directions to the plurality of second pixel areas, and the light guide channels for the optical signals in the first area are used for guiding the optical signals from the first area to the first pixel area.
In one possible embodiment, the optical path layer includes: the optical path layer further includes: and the micro-lens array is arranged above the at least one light blocking layer and is used for converging the optical signals in the N directions and the optical signals from the first area to the light guide channel of the at least one light blocking layer.
Optionally, the light guide channel in the same direction in the light guide channels in the N directions may have one or more light guide channels, and the one or more light guide channels correspond to the same second pixel region in the plurality of second pixel regions.
In one possible embodiment, the at least one light-blocking layer is two light-blocking layers.
In one possible embodiment, the optical path layer includes: n lenses, each of the N lenses for converging an optical signal in one of the N directions. In a possible implementation, the fingerprint identification device further includes: the processing unit is used for determining the maximum value and the minimum value of the optical signal quantity according to the optical signals in the N directions and the optical signals from the first area; and determining the current ambient light signal quantity according to the determined maximum value and the determined minimum value.
The current ambient light signal quantity is determined by acquiring the ambient light signals in N different directions, so that the accuracy of ambient light detection can be improved.
In a possible implementation, the processing unit is further configured to: determining that fingerprint pressing operation is currently performed; and adjusting the brightness of the display screen according to the determined current ambient light semaphore.
In this application embodiment, when using fingerprint identification, can realize fingerprint detection and ambient light detection simultaneously, according to the optical signal of the N orientation in the second region that acquires to and the optical signal of first region, can obtain current ambient light semaphore, thereby realize the detection to ambient light, and further, can realize the regulation to display screen luminance according to current ambient light semaphore.
In a possible implementation, the processing unit is further configured to: determining that no fingerprint pressing operation is currently performed; recording the number of times of the current ambient light detection as the ith time, and recording the ambient light signal quantity corresponding to the ith ambient light detection; determining whether i is greater than or equal to a preset threshold m; and if i is greater than or equal to a preset value m, generating the current ambient light semaphore according to the ambient light semaphore recorded for i times, and adjusting the brightness of the display screen according to the current ambient light semaphore, or if i is less than the preset value m, giving up adjusting the brightness of the display screen.
In the embodiment of the present application, the ambient light may also be detected when fingerprint recognition is not used, that is, the current ambient light semaphore is generated according to the acquired N directions of ambient light signals and the ambient light signal from the first area. Under the condition, the screen brightness can be adjusted by acquiring the value of the multiple times of ambient light detection and according to the value of the multiple times of ambient light detection, so that the screen brightness can be more adaptive to the ambient light, and the accuracy of screen brightness adjustment is improved.
In a possible implementation, the processing unit is further configured to: determining that the brightness of the display screen is not adjusted for the first time; acquiring the ambient light semaphore recorded at the previous time; and adjusting the brightness of the display screen according to the environment light semaphore recorded last time and the current environment light semaphore.
When it is determined that the screen brightness is not adjusted for the first time, the brightness of the display screen can be adjusted according to the environment light semaphore detected for the time, the environment light semaphore detected for the previous time and the screen brightness set value corresponding to the previous time, and therefore the accuracy of screen brightness adjustment can be further improved.
In a second aspect, an electronic device is provided, comprising: a display screen; and the fingerprint identification device in the first aspect or any one of the possible embodiments of the first aspect, the fingerprint identification device being disposed below the display screen to implement dual detection functions of optical fingerprint identification and ambient light detection under the screen.
In a third aspect, a method of ambient light detection is provided, which is applied to an electronic device having a fingerprint recognition device, the fingerprint recognition device being disposed below a display screen of the electronic device, a display area of the display screen including a fingerprint detection area, the fingerprint recognition device being configured to receive optical signals from N directions of a second area of the fingerprint detection area, and optical signals from a first area of the fingerprint detection area, the second area of the fingerprint detection area being disposed around the first area, N being an integer greater than 1, the method including: acquiring N optical signal quantities which are in one-to-one correspondence with the optical signals in the N directions and optical signal quantities which are in one-to-one correspondence with the optical signals from the first area; and generating the current ambient light semaphore according to the N light semaphores and the light semaphore.
The fingerprint identification device among the technical scheme of this application embodiment through the optical signal who acquires a plurality of not equidirectionals of second region to and the optical signal from first region, can realize fingerprint detection and environment light detection's dual detection function, simultaneously, through a plurality of values that acquire the light semaphore, the precision that can improve environment light detection is worth obtaining current environment light semaphore to a plurality of difference of light semaphore.
In one possible embodiment, the method further comprises: and adjusting the brightness of the display screen according to the current environment semaphore.
In a possible implementation, the generating the current ambient light semaphore according to the N number of light semaphores and the light semaphore comprises: determining the maximum value and the minimum value of the optical semaphore according to the N optical semaphores and the optical semaphore; and determining the current ambient light signal quantity according to the determined maximum value and the determined minimum value.
In one possible embodiment, the method further comprises: determining that fingerprint pressing operation is currently performed; and adjusting the brightness of the display screen according to the determined current ambient light semaphore.
In one possible embodiment, the method further comprises: determining that no fingerprint pressing operation is currently performed; recording the number of times of the current ambient light detection as the ith time, and recording the ambient light signal quantity corresponding to the ith ambient light detection; determining whether i is greater than or equal to a preset threshold m; and if i is greater than or equal to a preset value m, generating the current ambient light semaphore according to the ambient light semaphore recorded for i times, and adjusting the brightness of the display screen according to the current ambient light semaphore, or if i is less than the preset value m, giving up adjusting the brightness of the display screen.
In one possible embodiment, the method further comprises: determining that the brightness of the display screen is not adjusted for the first time; acquiring the ambient light semaphore recorded at the previous time; and adjusting the brightness of the display screen according to the environment light semaphore recorded last time and the current environment light semaphore.
In a fourth aspect, a chip is provided, where the chip includes an input/output interface, at least one processor, at least one memory, and a bus, where the at least one memory is used to store instructions, and the at least one processor is used to call the instructions in the at least one memory to perform the method in the third aspect or any possible implementation manner of the third aspect.
In a fifth aspect, there is provided a computer readable medium for storing a computer program comprising instructions for performing the method of the third aspect or any possible implementation manner of the third aspect.
A sixth aspect provides a computer program product comprising instructions which, when executed by a computer, cause the computer to perform the method of ambient light detection in the third aspect or any possible implementation of the third aspect. In particular, the computer program product may be run on the electronic device of the second aspect described above.
Drawings
Fig. 1 is a schematic configuration diagram of an electronic apparatus to which the present application can be applied.
Fig. 2 is a schematic cross-sectional view of the electronic device shown in fig. 1.
Fig. 3 is a schematic diagram of an electronic device according to an embodiment of the present application.
Fig. 4 is a schematic view of a field of view of a fingerprint sensor according to an embodiment of the present application.
Fig. 5 to 8 are schematic views of the field of view of the fingerprint sensor with 4 incoming light direction ambient light signals according to the embodiment of the present application.
Fig. 9 is another schematic diagram of an electronic device according to an embodiment of the present application.
Fig. 10 is a schematic diagram of an ambient light detection method according to an embodiment of the present application.
Fig. 11 is a schematic diagram of a method for adjusting screen brightness according to an embodiment of the present application.
Fig. 12 is a schematic block diagram of the structure of an electronic apparatus according to 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 can 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, but not limited to any limitation, and the embodiments of the present application are also applicable to other systems using optical imaging technology, etc.
The technical solution in the present application will be described below with reference to the accompanying drawings.
The technical scheme of the embodiment of the application can be applied to various electronic devices. Such as portable or mobile computing devices, e.g., smart phones, laptops, tablets, gaming devices, etc., and other electronic devices, e.g., electronic databases, automobiles, Automated Teller Machines (ATMs), etc. However, the present embodiment is not limited thereto.
The technical scheme of the embodiment of the application can be used for the biological feature recognition technology. The biometric technology includes, but is not limited to, fingerprint recognition, palm print recognition, iris recognition, face recognition, and living body recognition. For convenience of explanation, the fingerprint identification technology is described as an example below.
The technical scheme of the embodiment of the application can be used for the under-screen fingerprint identification technology and the in-screen fingerprint identification technology.
Fingerprint identification technique is installed in the display screen below with fingerprint identification module under the screen to realize carrying out the fingerprint identification operation in the display area of display screen, need not set up the fingerprint collection region in the positive region except that the display area of electronic equipment. Specifically, the fingerprint identification module uses the light that returns from the top surface of electronic equipment's display module to carry out fingerprint response and other response operations. This returned light carries information about objects (e.g., fingers) in contact with or in proximity to the top surface of the display assembly, and the fingerprint recognition module located below the display assembly performs underscreen fingerprint recognition by capturing and detecting this returned light. The fingerprint identification module can be designed to realize desired optical imaging by properly configuring an optical element for collecting and detecting returned light, so as to detect fingerprint information of the finger.
Correspondingly, (In-display) fingerprint identification technique means installs inside the display screen fingerprint identification module or partial fingerprint identification module In the screen to realize carrying out the fingerprint identification operation In the display area of display screen, need not set up the fingerprint collection region In the positive region except that the display area of electronic equipment.
Fig. 1 and 2 show schematic views of electronic devices to which embodiments of the present application may be applied. Fig. 1 is an orientation diagram of an electronic device 10, and fig. 2 is a cross-sectional diagram of the electronic device 10 shown in fig. 1.
Referring to fig. 1 and 2, the electronic device 10 may include a display 120 and an optical fingerprint identification module 130.
The display 120 may be a self-luminous display employing display units having self-luminous properties as display pixels. For example, the display screen 120 may be an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. In other alternative embodiments, the Display 120 may also be a Liquid Crystal Display (LCD) or other passive light emitting Display, which is not limited in this embodiment of the present application. Further, the display screen 120 may also be specifically a touch display screen, which not only can perform image display, but also can detect a touch or pressing operation of a user, thereby providing a human-computer interaction interface for the user. For example, in one embodiment, the electronic device 10 may include a Touch sensor, which may be embodied as a Touch Panel (TP), which may be disposed on a surface of the display screen 120, or may be partially or wholly integrated within the display screen 120, thereby forming the Touch display screen.
Optical fingerprint module 130 includes an optical fingerprint sensor that includes a sensing array 133 having a plurality of optical sensing elements 131 (which may also be referred to as optical sensing pixels, light sensing pixels, pixel cells, etc.). The sensing array 133 is located in an area or a sensing area thereof, which is the fingerprint detection area 103 (also called a fingerprint collection area, a fingerprint identification area, etc.) of the optical fingerprint module 130.
Wherein, the optical fingerprint module 130 is disposed in a local area below the display screen 120.
With continued reference to fig. 1, the fingerprint detection area 103 may be located within a display area of the display screen 120. In an alternative embodiment, the optical fingerprint module 130 may be disposed at other positions, such as the side of the display screen 120 or the edge opaque area of the electronic device 10, and the optical path is designed to guide the optical signal from at least a part of the display area of the display screen 120 to the optical fingerprint module 130, so that the fingerprint detection area 103 is actually located in the display area of the display screen 120.
For the electronic device 10, when a user needs to unlock or perform other fingerprint verification on the electronic device 10, the user only needs to press a finger on the fingerprint detection area 103 of the display screen 120, so as to realize fingerprint input. Since fingerprint detection can be implemented in the screen, the electronic device 10 with the above structure does not need to reserve a special space on the front surface thereof to set a fingerprint key (such as a Home key), so that a full-screen scheme can be adopted, that is, the display area of the display screen 120 can be substantially extended to the front surface of the whole electronic device 10.
With continued reference to fig. 2, the optical fingerprint module 130 may include a light detection portion 134 and an optical assembly 132. The light detecting portion 134 includes the sensing array 133 (also referred to as an optical fingerprint sensor) and a reading circuit and other auxiliary circuits electrically connected to the sensing array 133, which can be fabricated on a chip (Die) by a semiconductor process, such as an optical imaging chip or an optical fingerprint sensor. The sensing array 133 is specifically a Photo detector (Photo detector) array, which includes a plurality of Photo detectors distributed in an array, and the Photo detectors can be used as the optical sensing units as described above. The optical assembly 132 may be disposed above the sensing array 133 of the light detecting portion 134, and may specifically include a Filter (Filter) for filtering out ambient light penetrating through the finger, a light guiding layer or a light path guiding structure for guiding reflected light reflected from the surface of the finger to the sensing array 133 for optical detection, and other optical elements.
In some embodiments of the present application, the optical assembly 132 may be packaged with the same optical fingerprint component as the light detection portion 134. For example, the optical component 132 may be packaged in the same optical fingerprint chip as the optical detection portion 134, or the optical component 132 may be disposed outside the chip where the optical detection portion 134 is located, for example, the optical component 132 is attached to the chip, or some components of the optical component 132 are integrated into the chip.
In some embodiments of the present application, the area or the light sensing range of the sensing array 133 of the optical fingerprint module 130 corresponds to the fingerprint detection area 103 of the optical fingerprint module 130. The fingerprint collecting area 103 of the optical fingerprint module 130 may be equal to or not equal to an area or a light sensing range of an area where the sensing array 133 of the optical fingerprint module 130 is located, which is not specifically limited in the embodiment of the present application.
For example, the light path is guided by the light collimation method, and the fingerprint detection area 103 of the optical fingerprint module 130 may be designed to be substantially consistent with the area of the sensing array of the optical fingerprint module 130.
For another example, for example, through a light path design such as lens imaging, a reflective folded light path design, or other light path designs such as light convergence or reflection, the area of the fingerprint detection area 103 of the optical fingerprint module 130 may be larger than the area of the sensing array 133 of the optical fingerprint module 130.
The following is an exemplary description of the optical path guiding structure that the optical component 132 may include.
Taking the optical Collimator with the through hole array having the high aspect ratio as an example, the optical Collimator may specifically be a Collimator (collimater) layer made on a semiconductor silicon wafer, and the optical Collimator has a plurality of collimating units or micro holes, the collimating units may specifically be micro holes, and the collimating units have a specific direction, for example, the specific direction may be a vertical direction or an inclined direction with a certain angle. In the light signals returned by the finger, the return light with the specific direction can be incident into the collimation unit, the light passing through the collimation unit can pass through and be received by the sensor chip below the collimation unit, and the light of other incident angles is attenuated in the collimation unit after multiple reflections, so that each sensor chip can only receive the reflected light reflected by the fingerprint lines corresponding to the sensor chip above the sensor chip basically, the image resolution can be effectively improved, and the fingerprint identification effect is further improved.
Taking the optical path design of the optical Lens adopted by the optical path guiding structure as an example, the optical path guiding structure may be an optical Lens (Lens) layer, which has one or more Lens units, such as a Lens group composed of one or more aspheric lenses, and is used for converging the reflected light reflected from the finger to the sensing array 133 of the light detection portion 134 therebelow, so that the sensing array 133 may perform imaging based on the reflected light, thereby obtaining the fingerprint image of the finger. Further, the optical lens layer may further be formed with a pinhole or a micropore diaphragm in the optical path of the lens unit, for example, one or more light-shielding sheets may be formed in the optical path of the lens unit, wherein at least one light-shielding sheet may be formed with a light-transmitting micropore in the optical axis or the optical central region of the lens unit, and the light-transmitting micropore may serve as the pinhole or the micropore diaphragm. The pinhole or the micro-aperture diaphragm can cooperate with the optical lens layer and/or other optical film layers above the optical lens layer to enlarge the field of view of the optical fingerprint module 130, so as to improve the fingerprint imaging effect of the optical fingerprint module 130.
Taking the optical path design of the optical path guiding structure using a Micro-Lens (Micro-Lens) layer as an example, the optical path guiding structure may be a Micro-Lens array formed by a plurality of Micro-lenses, which may be formed above the sensing array 133 of the light detecting portion 134 through a semiconductor growth process or other processes, and each Micro-Lens may correspond to one or more sensing units of the sensing array 133, respectively. And other optical film layers, such as a dielectric layer or a passivation layer, can be formed between the microlens layer and the sensing unit. More specifically, a light blocking layer (or referred to as a light shielding layer, a light blocking layer, etc.) having micro holes (or referred to as open holes) may be further included between the microlens layer and the sensing unit, wherein the micro holes are formed between the corresponding microlenses and the sensing unit, and the light blocking layer may block optical interference between adjacent microlenses and the sensing unit, and enable light corresponding to the sensing unit to be converged into the micro holes through the microlenses and transmitted to the sensing unit through the micro holes for optical fingerprint imaging.
It should be understood that several of the implementations described above for the optical path directing structure may be used alone or in combination.
For example, a microlens layer may be further disposed above or below the collimator layer or the optical lens layer. Of course, when the collimator layer or the optical lens layer is used in combination with the microlens layer, the specific lamination structure or optical path thereof may need to be adjusted according to actual needs.
On the other hand, the optical assembly 132 may further include other optical elements, such as a Filter (Filter) or other optical film, which may be disposed between the optical path guiding structure and the optical fingerprint sensor or between the display screen 120 and the optical path guiding structure, and mainly used for isolating the influence of external interference light on the optical fingerprint detection. The filter layer may be configured to filter ambient light that penetrates through a finger and enters the optical fingerprint sensor through the display screen 120, and similar to the optical path guiding structure, the filter layer may be respectively disposed for each optical fingerprint sensor to filter interference light, or may also cover the plurality of optical fingerprint sensors simultaneously with one large-area filter layer.
Fingerprint identification module 140 may be configured to collect fingerprint information (e.g., fingerprint image information) of a user.
Taking the display screen 120 as an example, the display screen has a self-luminous display unit, such as an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. The optical fingerprint module 130 may use a display unit (i.e., an OLED light source) of the OLED display screen 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection. When the finger 140 is pressed against the fingerprint detection area 103, the display 120 emits a beam of light 111 towards the target finger 140 above the fingerprint detection area 103, and the light 111 is reflected at the surface of the finger 140 to form reflected light or scattered light (transmitted light) is formed by scattering through the inside of the finger 140. In the related patent application, the above-mentioned reflected light and scattered light are collectively referred to as return light for convenience of description. Because the ridges (ridges) 141 and the valleys (valley)142 of the fingerprint have different light reflection capacities, the return light 151 from the ridges and the return light 152 from the valleys of the fingerprint have different light intensities, and after passing through the optical assembly 132, the return light is received by the sensing array 133 in the optical fingerprint module 130 and converted into corresponding electric signals, i.e., fingerprint detection signals; fingerprint image data can be obtained based on the fingerprint detection signal, and fingerprint matching verification can be further performed, so that an optical fingerprint identification function is realized in the electronic device 10.
In other alternatives, the optical fingerprint module 130 may also use an internal light source or an external light source to provide an optical signal for fingerprint detection and identification. In this case, the optical fingerprint module 130 may be applied to not only a self-luminous display screen such as an OLED display screen, but also a non-self-luminous display screen such as a liquid crystal display screen or other passive luminous display screens.
Taking an application to a liquid crystal display screen with a backlight module and a liquid crystal panel as an example, to support the underscreen fingerprint detection of the liquid crystal display screen, the optical fingerprint system of the electronic device 10 may further include an excitation light source for optical fingerprint detection, where the excitation light source may specifically be an infrared light source or a light source of non-visible light with a specific wavelength, and may be disposed below the backlight module of the liquid crystal display screen or in an edge area below a protective cover plate of the electronic device 10, and the optical fingerprint module 130 may be disposed below the edge area of the liquid crystal panel or the protective cover plate and guided through a light path so that the fingerprint detection light may reach the optical fingerprint module 130; alternatively, the optical fingerprint module 130 may be disposed below the backlight module, and the backlight module may open holes or perform other optical designs on film layers such as a diffusion sheet, a brightness enhancement sheet, and a reflection sheet to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint module 130. When the optical fingerprint module 130 is used to provide an optical signal for fingerprint detection by using an internal light source or an external light source, the detection principle is consistent with the above description.
In a specific implementation, the electronic device 10 may further include a transparent protective cover, which may be a glass cover or a sapphire cover, located above the display screen 120 and covering the front surface of the electronic device 10. Therefore, in the embodiment of the present application, the pressing of the finger 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.
With the popularization of mobile phones, in order to provide better user experience, many mobile phones use an ambient light detection technology to realize some intelligent functions, such as automatically adjusting a keyboard lamp and screen brightness. But its implementation mode is usually through increasing sensitization through the sensitization device realization on the hardware, has increased the cell-phone cost, and this application embodiment is through optimizing and improving the fingerprint identification device in the electronic equipment, has provided a fingerprint identification device, electronic equipment for fingerprint identification device can realize fingerprint detection and the dual function of detecting of ambient light, under the prerequisite that does not increase the cost, has improved user's experience.
The fingerprint identification device according to the embodiment of the present application will be described in detail below with reference to the accompanying drawings.
In order to realize the dual detection function of fingerprint detection and ambient light detection by the fingerprint sensor, the electronic device according to the embodiment of the present application will be described in detail below with reference to the accompanying drawings. Specifically, fig. 3 shows a schematic diagram of the electronic device 30 according to the embodiment of the present application, and as shown in fig. 3, the electronic device includes a display screen 300 and a fingerprint identification device 400 disposed below the display screen 300, a display area of the display screen 300 includes a fingerprint detection area and a non-fingerprint detection area, where the fingerprint detection area may be an area for receiving a finger press.
It should be understood that the fingerprint detection area in the embodiment of the present application may also include two portions, one portion may be a first area for receiving a fingerprint pressing in the fingerprint detection area, for example, a portion provided with a light spot, and the other portion may be a second area around the area for receiving the fingerprint pressing, for example, a portion around the light spot, where the light signals passing through the two portions in the embodiment of the present application may be received by the fingerprint identification device in the embodiment of the present application, so as to implement dual detection functions of fingerprint detection and ambient light detection.
It should be understood that the display screen 300 of the present embodiment may be used to provide a touch interface for a finger. When the user needs to perform fingerprint recognition, a finger touches a fingerprint detection area of the display screen 300. The display 300 may include light-emitting display pixels capable of emitting light, and in a first region of the display 300, the light emitted by the light-emitting display pixels illuminates a finger, and the light may be reflected or scattered by the surface and inside of the finger to generate a return light signal, and a region of the fingerprint recognition device 400 located below the display 300 for detecting fingerprint data may be used to receive the return light signal from the first region, and at the same time, a region of the fingerprint recognition device 400 for detecting ambient light may be used to receive a light signal from a second region of the display 300, and the light signal received by the region for detecting ambient light may include the ambient light signal and may also include the return light signal reflected by the finger.
Alternatively, when the user does not need to perform fingerprint recognition, the electronic device 30 in the embodiment of the present application may also perform ambient light detection, where the area for detecting fingerprint data in the fingerprint recognition device 400 located below the display screen 300 may be used to receive an ambient light signal from the first area, and the area for detecting ambient light in the fingerprint recognition device 400 may be used to receive an optical signal from the second area of the display screen 400.
For convenience of understanding, in the embodiments of the present application, a region where the light spot is disposed at a center position of the fingerprint detection region is used as the first region, and an edge region of the fingerprint detection region is used as the second region.
It should be understood that the fingerprint recognition device 400 in the embodiment of the present application can receive the diffusely reflected light signal from the screen regardless of whether the display screen 400 is pressed by a finger, and more specifically, when fingerprint recognition is used, the light signal received by the area for fingerprint detection in the fingerprint recognition device 400 mainly comes from the diffuse reflection of the screen and the return light signal after the finger reflection, and when fingerprint recognition is not used, the light signal received in the fingerprint recognition device 400 mainly comes from the diffuse reflection of the screen and the transmission of the ambient light. In the embodiment of the present application, when the current optical signal amount is calculated by the received optical signals from the N directions of the second area and the optical signal from the first area, the diffuse reflections from the screen may cancel each other out, so that it is not further described in the description of the embodiment of the present application, but it should be understood that the optical signal received by the pixel unit in the embodiment of the present application may include the signal of the diffuse reflection from the screen.
Specifically, as shown in fig. 3, the fingerprint recognition device 400 of the embodiment of the present application includes an optical path layer 410 and an optical fingerprint sensor 420. The optical path layer 410 may be used to guide the optical signals from the N directions of the second area of the fingerprint detection area, and the optical signals from the first area of the fingerprint detection area to the optical fingerprint sensor 420; an optical fingerprint sensor 420 is disposed below the optical path layer 410 for receiving the optical signals of the N directions and the optical signal from the first area. Specifically, the optical fingerprint sensor 420 in the embodiment of the present application may include a first pixel region and a plurality of second pixel regions, the plurality of second pixel regions being disposed around the first pixel region, the first pixel region being configured to receive an optical signal from the first region, the plurality of second pixel regions being configured to receive optical signals from the second region in N directions, wherein each of the plurality of second pixel regions is configured to receive an optical signal in one of the N directions. It should be understood that the direction of the light signal received by the first pixel region from the first region in the embodiments of the present application may be one or more, and the present application does not limit this.
It should be understood that the number of the second pixel regions in the embodiment of the present application may be N, in which case, the N second pixel regions may correspond to the optical signals in the N directions one to one; or, in this embodiment of the application, the number of the second pixel regions may also be multiple, the optical signal in one direction of the N directions may correspond to 2 or more than 2 second pixel regions, and in a case where the optical signal in one direction corresponds to multiple second pixel regions, more different optical signal magnitudes may be obtained, so as to further improve the accuracy of the ambient light detection.
As an embodiment, the optical signals of N directions acquired by the fingerprint identification device 400 in the embodiment of the present application, and the optical signal from the first area may be used to generate the current ambient light semaphore.
Only the first pixel region 411 and the second pixel region 412 are exemplarily shown in fig. 3, wherein the first pixel region 411 corresponds to a middle portion in fig. 3, and the second pixel region 412 corresponds to an edge portion in fig. 3, wherein only the first pixel region 411 and the second pixel region 412 are exemplarily shown in fig. 3, and a corresponding optical signal is not shown, but the embodiment of the present application is not limited thereto. For example, fig. 4 is a schematic diagram of a pixel area and a corresponding light signal of a fingerprint sensor according to an embodiment of the present application.
As shown in fig. 4, the pixel area of the fingerprint sensor may include a first pixel area 401 and a second pixel area 402, where the first pixel area 401 may receive an optical signal from a first area on the display screen, and specifically, when a fingerprint is pressed, the first pixel area 401 may receive a return optical signal from the first area of the display screen, which returns after being reflected by a finger, or may also receive an ambient optical signal from the first area; alternatively, the first pixel region 401 may be used to receive an ambient light signal from a first region on the front side of the display screen when a fingerprint pressing operation is not performed.
It should be understood that, the main improvement made by the embodiments of the present application in view of the prior art is that the fingerprint identification device can simultaneously realize the dual functions of fingerprint unlocking and ambient light detection, and the fingerprint unlocking can refer to the prior art.
The second pixel area 402 can receive ambient light signals from at least two directions of the second area on the display screen, and the area of the second pixel area 402 is larger than that of the first pixel area 401, so that the blocking of a finger can be avoided, and when fingerprint identification is realized, ambient light can be detected, or when fingerprint identification is not performed, ambient light can be detected.
It should be understood that whether the display screen is pressed by a finger or not, the first pixel region receives the light signal from the first region, and the second pixel region receives the light signal from the second region, only when the finger is pressed, a part of the received light signal is from the return light signal reflected by the finger, but this does not affect the detection of the ambient light according to the embodiment of the present application.
As an embodiment, in the embodiment of the present application, the second view area corresponding to the plurality of second pixel areas is larger than the first view area corresponding to the first pixel area. Specifically, the first pixel region 401 and the second pixel region 402 include optical sensing pixels, wherein different regions of the second pixel region 402 that receive ambient light signals in different directions may respectively include at least one optical sensing pixel, and the optical sensing pixels included in the second pixel region 402 are disposed around the optical sensing pixels included in the first pixel region 401, such that the area of the second pixel region 402 is larger than the area of the first pixel region 401, wherein the optical sensing pixels included in the first pixel region 401 may be configured to receive light signals in a light entering direction of the first pixel region 401, which is a light entering direction 403 of a fingerprint collection pixel, as shown by an arrow in fig. 4; the second pixel region 402 includes optically sensitive pixels that can receive light signals directed in the light entering direction of the second pixel region 402 by arrows, i.e., the ambient light detecting pixel light entering direction 404.
It should be understood that the first pixel region and the second pixel region in the embodiment of the present application may also be referred to as a first field of view region and a second field of view region, or in other words, the first pixel region and the second pixel region in the embodiment of the present application may correspond to the first field of view region and the second field of view region, respectively, and the field of view region in the embodiment of the present application may be understood as an angular range in which the fingerprint sensor may receive an influence.
It should be understood that each pixel region shown in fig. 4 is only exemplary and may include an optical sensing pixel, and in practical applications, the number of the optical sensing pixels may be set according to practical requirements.
It should be understood that fig. 4 only exemplarily shows a corresponding relationship between the ambient light incoming direction and the second pixel region, the ambient light signal received by the second pixel region 402 in the embodiment of the present application may include light signals in at least two directions, a plurality of different light signal quantities may be obtained by obtaining the light signals in different directions, and the accuracy of ambient light detection may be improved by obtaining the current ambient light signal quantity according to the plurality of different light signal quantities.
Fig. 5 further shows a schematic diagram of a pixel area of a fingerprint sensor including light signals in 4 incoming light directions according to an embodiment of the present application. As shown in fig. 5, the pixel area of the fingerprint sensor includes a first pixel area 501 and a second pixel area 502, where the first pixel area 501 can also be represented as an area S0, and the first pixel area 501 or the area S0 can be used to receive a return light signal reflected by a finger when the finger is pressed in the first area (which may be a middle area of a display screen), or an ambient light signal when the finger is not pressed in the first area, and it should be understood that the fingerprint unlocking process in the embodiment of the present application may specifically refer to the prior art; the second pixel region 502 may include 4 sub-regions S1, S2, S3, and S4, each of which may receive light signals from different light incoming directions L1, L2, L3, and L4 (corresponding to the second region of the display screen), wherein the light signals may include ambient light signals and return light signals reflected by fingers.
It should be understood that, in the embodiment of the present application, the angle θ of the light entering directions L1-L4 of the ambient light is not limited, and θ may take any value from 0 ° to 180 °.
In the embodiment of the present application, as an implementation manner, when fingerprint recognition is used, the S0 area may receive a return light signal from the first area of the display screen, which is returned by the finger when the finger is pressed, or alternatively, the S0 area may also receive an ambient light signal from the first area; s1 to S4 may respectively acquire ambient light signals in 4 different directions L1 to L4, or alternatively, when the finger also presses the second region, S1 to S4 may also acquire return light signals reflected by the finger in 4 different directions, so that the fingerprint recognition apparatus according to the embodiment of the present application may perform ambient light detection while realizing fingerprint recognition.
Or, as another implementation manner, when fingerprint recognition is not used, the S0 area may receive an ambient light signal from the first area on the front surface of the display screen, and the S1 to S4 may respectively obtain ambient light signals from the second area in 4 different directions L1 to L4, so that the fingerprint recognition apparatus according to the embodiment of the present application may also realize detection of ambient light when the fingerprint recognition function is not used. Specifically, the fingerprint identification device in the embodiment of the present application may obtain a plurality of different light semaphore through the obtained light signal from the second region in different light entering directions and the light signal from the first region, and then generate the current ambient light semaphore according to the plurality of different light semaphore, thereby implementing the detection of the ambient light.
Optionally, in this embodiment of the application, the plurality of second pixel regions are disposed on different sides of the first pixel region, or the plurality of second pixel regions are disposed on the same side of the first pixel region, or the plurality of second pixel regions are disposed at corners of the first pixel region.
As shown in fig. 5, in the embodiment of the present application, the 4 sub-regions S1 to S4 in the second pixel region 502 are respectively distributed on four sides of the first pixel region, so that ambient light signals in different directions can be received from multiple directions, on one hand, the possibility that the second pixel region 502 is blocked by a finger is avoided, and on the other hand, the accuracy of ambient light detection is also improved, but the present application is not limited thereto. Another schematic diagram of a distribution of sub-regions of the second pixel area of the fingerprint sensor in an embodiment of the application is shown in fig. 6. As shown in fig. 6, on each side of the first pixel region 601, all 4 sub-regions S1 to S4 of the second pixel region 602 may be distributed at the same time, wherein S1 to S4 correspond to the light incoming directions L1 to L4 of different optical signals, respectively. In this way, the accuracy of the acquired ambient light signal quantity can be further improved.
Fig. 7 is a schematic diagram illustrating a second pixel region distributed at a corner of a first pixel region according to an embodiment of the present disclosure. As shown in fig. 7, the N second pixel sub-regions may also take 4 as an example, which are sequentially S1 to S4, and respectively correspond to four ambient light signals with light entering directions of L1 to L4, wherein the photo-sensing pixels included in each second pixel sub-region may be arranged according to practical situations, which is not limited in this application.
It should be understood that each pixel region in the embodiment of the present application includes an optical sensing pixel, and the distribution of the pixel regions may also be understood as the distribution of the optical sensing pixels, as shown in fig. 7, the 4 second pixel sub-regions distributed at the four corners of the first pixel region 701 may also be understood as the optical sensing pixels for ambient light detection distributed at the four corners of the optical sensing pixels for fingerprint detection, that is, as shown in fig. 7, the second pixel regions 702 for ambient light detection do not completely occupy each side around the first pixel region 701, but the second pixel regions 702 are only disposed at the four corners.
In the descriptions of fig. 4 to 6, the plurality of second pixel regions in the embodiment of the present application are arranged in the first pixel region only in one turn, and alternatively, the plurality of second pixel regions may be arranged in at least one ring-shaped region around the first pixel region.
For example, fig. 8 shows a schematic diagram of a fingerprint sensor including a plurality of turns of the second pixel region according to an embodiment of the present application. As shown in fig. 8, the 4 second pixel sub-regions S1-S4 are distributed on four sides of the first pixel region 801, and there may be multiple circles of the 4 sub-regions distributed on four sides of the first pixel region 801.
Similarly, each pixel region in the embodiment of the present application includes an optical sensing pixel, and the distribution of the pixel regions can also be understood as the distribution of the optical sensing pixels, for example, in fig. 8, the plurality of turns of 4 second pixel sub-regions distributed on four sides of the first pixel region 801 can also be understood as the plurality of turns of the optical sensing pixels for ambient light detection distributed on four sides of the optical sensing pixels for fingerprint detection. The number of the photo-sensing pixels included in each pixel region may be set according to practical situations, which is not limited in this embodiment of the present application.
Optionally, in this embodiment of the application, the second pixel region located on the same side of the first pixel region may be configured to receive the ambient light signal in the same one of the N directions; alternatively, a second pixel region located on the same side of the first pixel region may be configured to receive the N-direction ambient light signals. See for example the embodiments in fig. 5 and 6 in particular.
Optionally, as an embodiment, the current ambient light semaphore generated in the embodiment of the present application may be used to adjust the brightness of the display screen, or may also be used to adjust a keyboard lamp, and the like, which is not limited in the embodiment of the present application.
It should be understood that the display screen 300 in the embodiment of the present application may correspond to the display screen 120 in the electronic device 10 in fig. 1 and 2 and is applicable to the related description of the display screen 120, and the fingerprint identification apparatus 300 may correspond to the optical fingerprint identification module 130 in the electronic device 10 in fig. 1 and 2 and is applicable to the related description of the optical fingerprint identification module 130, for example, the optical path layer 310 in the fingerprint identification apparatus 300 may correspond to the light detection portion 134 in the fingerprint identification module 130, and the optical fingerprint sensor 320 in the fingerprint identification apparatus 300 may correspond to the optical element 132 in the fingerprint identification module 130, which is not repeated herein for brevity.
In the embodiment of the present application, the optical path layer 310 may have various forms, for example, the optical path layer 310 may include an optical lens, a micro lens, a collimator, or the like, which will be illustrated in the following with reference to the accompanying drawings.
Optionally, as an embodiment, the optical path layer 310 of the embodiment of the present application may include at least one light-blocking layer, where each light-blocking layer in the at least one light-blocking layer is provided with an array of small holes to form light-guiding channels in N directions, and the light-guiding channels in N directions are used to guide optical signals in N directions to the plurality of second pixel regions, respectively.
Optionally, the N-directional light-conducting channels may each correspond to one or more optically sensitive pixels in the optical fingerprint sensor 320.
As an embodiment, the light guide channels in the same direction in the light guide channels in the N directions correspond to the same second pixel region.
Specifically, as shown in fig. 3, it is exemplified here that at least one light-blocking layer includes two light-blocking layers, namely, a light-blocking layer 1 and a light-blocking layer 2, and the light-blocking layer 1 and the light-blocking layer 2 are provided with small hole arrays 1 and 2, respectively. Since the second pixel area 412 for detecting the ambient light and the first pixel area 411 for fingerprint detection are shown in fig. 3, and taking as an example that the second pixel area 412 includes 12 photo-sensing pixels at the corners and the first pixel area 411 includes 4 photo-sensing pixels in the middle, fig. 3 only shows the partial areas of the light blocking layers 1 and 2 corresponding to the photo-sensing pixels of the first pixel area 411 and the second pixel area 412; in order to form the optical signals capable of passing through the first area and the second area, fig. 3 exemplifies that the aperture array disposed on the light blocking layer 1 includes 2 apertures (light passing apertures 1), and the aperture array disposed on the light blocking layer 2 also includes 2 apertures (light passing apertures 2), and these aperture arrays form 2 light guiding channels as shown in fig. 3, so as to respectively guide the optical signals of the second area and the optical signals of the first area to the optical sensing pixels below, but the embodiment of the present application is not limited thereto.
It should be understood that the number of light blocking layers in the embodiment of the present application can be flexibly set according to practical applications. For example, instead of the light path layer 410 shown in fig. 3 including two light-blocking layers 1 and 2, the light path layer 410 may also be arranged to include more than two light-blocking layers to form light-guiding channels having N directions; alternatively, only one light-blocking layer may be provided. Specifically, for the case where only one light blocking layer is provided, the light blocking layer may have a certain thickness, so that each small hole in the small hole array in the light blocking layer is a light guide channel; or, when one light-blocking layer is arranged, the principle of pinhole imaging may also be utilized, and the return light signals in the N directions are transmitted to the optical fingerprint sensor 420 below through the N pinholes arranged on the light-blocking layer in a pinhole imaging manner, so that the light signal quantities in the N directions can be obtained, which is not limited in the embodiment of the present application.
The size and number of the aperture arrays of each light-blocking layer in the embodiment of the present application can also be flexibly set according to practical applications, for example, the number and size of the apertures of the light-blocking layer can be set according to the direction of the return light signal that needs to be received, or according to the number and size of the optical sensing pixels in the light fingerprint sensor 420. For example, the number of the apertures of the plurality of light-blocking layers may be set equal, or may be set unequal. The size of the aperture arrays of the same light-blocking layer can be the same or different, and the size of the aperture arrays of different light-blocking layers can be the same or different. For example, as shown in fig. 3, the number of the apertures of the plurality of light-blocking layers may be set to be the same, and the sizes of all the apertures included in the same light-blocking layer may be set to be the same, while the sizes of all the apertures included in the plurality of light-blocking layers may also be set to be the same; alternatively, all the apertures included in the same light-blocking layer may be set to have the same size, and the number of the apertures of the plurality of light-blocking layers may be set to be different, and the size of the apertures of the different light-blocking layers may be different, for example, in the direction from the display 300 to the underlying optical fingerprint sensor 420, the number of the apertures of each light-blocking layer increases sequentially, and the size of the aperture of each light-blocking layer decreases sequentially, but the embodiment of the present application is not limited thereto.
For example, also for guiding optical signals in N directions, as well as optical signals from the first area, it is also possible to arrange a different number of aperture arrays on the light-blocking layers 1 and 2 than shown in fig. 3. For example, 2 holes on the light-blocking layer 1 in fig. 3 can be combined into one hole, while 2 holes are still disposed on the light-blocking layer 2, and the optical signals in N directions and the optical signals from the first area can also be guided, which are not listed here for brevity.
It should be understood that the shape of the apertures provided in the light-blocking layers in the embodiments of the present application may be set according to the actual application, and the shape of the apertures in the same light-blocking layer may be the same or different, and the shape of the apertures in different light-blocking layers may also be the same or different. For example, as shown in fig. 3, the small holes on all the light blocking layers may be set to have the same shape, such as 3 is only a circle, or may also be set to have other shapes, such as a rectangle or a triangle, which is not limited in this application.
Optionally, as an embodiment, for the fingerprint identification device 400 in fig. 3, in order to improve the imaging effect, the optical path layer 410 may further include a microlens array 430. The microlens array 430 in the embodiment of the present application may be disposed above the at least one light blocking layer, and is configured to converge the N optical signals and the optical signal from the first region to the light guide channel of the at least one light blocking layer.
Optionally, one microlens in the microlens array in the embodiment of the present application may correspond to light guide channels belonging to the same direction in the light guide channels in the N directions, or may also correspond to light guide channels in different directions in the light guide channels in the N directions.
Only two microlenses in the microlens array 430 are shown in fig. 3, and each microlens may correspond to one optical sensing pixel in the optical path layer 410, for example, each microlens may correspond to one underlying light guide channel, that is, the left microlens may correspond to one optical sensing pixel in the second pixel region 412, and the right microlens may correspond to one optical sensing pixel in the first pixel region 411.
It should be understood that fig. 3 is described by taking one of the optical signals in the N directions and one of the optical signals from the first region as an example, but the embodiment of the present application is not limited thereto.
Alternatively, as another embodiment, in order to improve the imaging effect, a lens may be used to converge the optical signal. The optical path layer 410 in the embodiment of the present application may also include: n lenses, each lens in the N lenses is used for converging the optical signal in one direction in N directions.
Fig. 9 shows a further schematic diagram of the electronic device according to the embodiment of the present application, and the optical path layer 410 may include a lens 440, and fig. 9 exemplifies a lens corresponding to the fingerprint pressing area for converging the optical signal from the finger first area. Here, the microlens array as described in fig. 3 may be used in a position corresponding to the second region, or a lens may be used in a position corresponding to the non-fingerprint pressed region in the embodiment of the present application.
It should be understood that the different optical path layers 410 shown in fig. 3 and 9 may be used alone or in combination with each other, and the embodiments of the present application are not limited thereto. No matter which optical path layer is used, the N directions in the embodiment of the present application can be flexibly set according to practical applications. Therefore, the electronic device 30 of the embodiment of the present application, through the optical path layer 410 and the optical fingerprint sensor 420, may be configured to receive optical signals from the second area in N directions, and optical signals from the first area, where N is an integer greater than 1. The N-directional light signals, and the light signal from the first region, may be used to generate a current ambient light semaphore, which may be used for detection of ambient light.
Fig. 10 shows a flow diagram of a method for ambient light detection according to an embodiment of the present application. The method 1000 may be applied to an electronic device having a fingerprint recognition device disposed below a display screen of the electronic device, the display area of the display screen including a fingerprint detection area, the fingerprint recognition device being configured to receive optical signals from N directions of a second area of the fingerprint detection area and optical signals from a first area of the fingerprint detection area, N being an integer greater than 1. For example, the method may be applied to the electronic devices shown in fig. 3 and 9, but the embodiments of the present application are not limited thereto. The following description will take as an example the application of the method 1000 to the electronic device shown in fig. 3.
As shown in fig. 10, the method may include steps S1012 and S1020, which are described in detail below.
S1010, acquiring N optical signal quantities corresponding to the optical signals in the N directions one to one, and optical signal quantities corresponding to the optical signals from the first area one to one.
And S1020, generating the current environment light semaphore according to the N light semaphores and the light semaphore.
The fingerprint identification device of this application embodiment can obtain current environment light semaphore according to a plurality of light semaphores that acquire to can realize the detection to environment light, then can realize fingerprint detection and environment light detection's dual detection function.
It should be understood that the ambient light detection method in the embodiment of the present application may be divided into two cases, alternatively, when performing fingerprint detection, the fingerprint identification device may acquire N optical signal quantities of the second area and the optical signal quantity of the first area, where, due to the finger pressing, the optical signal from the second area or the first area may include an ambient light signal and may also include a return optical signal reflected by the finger; alternatively, when no fingerprint is detected, the fingerprint identification device may obtain N amounts of ambient light signals from the second area and an amount of light signals corresponding to the ambient light signals from the first area, since no fingerprint is pressed. The fingerprint identification device of the embodiment of the application can obtain the current ambient light semaphore by acquiring a plurality of light semaphores, thereby realizing the dual detection functions of fingerprint detection and ambient light detection.
Optionally, generating the current ambient light semaphore according to the N ambient light semaphores and the light semaphore may include: determining the maximum value and the minimum value of the optical semaphore according to the N optical semaphores and the optical semaphore; and determining the current ambient light signal quantity according to the determined maximum value and the determined minimum value.
Optionally, as an embodiment, the obtained current ambient light semaphore may be used to adjust screen brightness, and specifically, the method further includes: and adjusting the brightness of the display screen according to the current environment semaphore.
Optionally, as an embodiment, when it is determined that a fingerprint pressing is performed, the screen brightness may be adjusted according to the acquired environment semaphore, and specifically, the method further includes: determining that fingerprint pressing operation is currently performed; and adjusting the brightness of the display screen according to the determined current ambient light semaphore.
Alternatively, as another embodiment, when it is determined that no fingerprint pressing is performed, the screen brightness may be adjusted by acquiring the results of the plurality of times of ambient light detection. Specifically, the method further comprises: determining that no fingerprint pressing operation is currently performed; recording the number of times of the current ambient light detection as the ith time, and recording the ambient light signal quantity corresponding to the ith ambient light detection; determining whether i is greater than or equal to a preset threshold m; and if i is greater than or equal to a preset value m, generating the current ambient light semaphore according to the ambient light semaphore recorded for i times, and adjusting the brightness of the display screen according to the current ambient light semaphore, or if i is less than the preset value m, giving up adjusting the brightness of the display screen.
When fingerprint identification is not used, the screen brightness is adjusted by acquiring the result of multiple times of ambient light detection, so that the accuracy of screen brightness adjustment can be further improved, and the user experience is improved.
Furthermore, in the embodiment of the present application, the screen brightness may be adjusted by using the result of multiple screen brightness adjustments. Specifically, the method further comprises: determining that the brightness of the display screen is not adjusted for the first time; acquiring the ambient light semaphore recorded at the previous time; and adjusting the brightness of the display screen according to the environment light semaphore recorded last time and the current environment light semaphore.
The current screen brightness is adjusted by utilizing the result of the previous screen brightness adjustment and the result of the current ambient light detection, so that the accuracy of the screen brightness adjustment can be further improved.
To further explain the process of adjusting the screen brightness in the embodiment of the present application, a schematic diagram of the screen brightness adjustment process in the embodiment of the present application shown in fig. 11 is taken as an example for explanation. Wherein the corresponding pixel regions may be as described with reference to fig. 5. As shown in fig. 11, the process 1100 includes:
s1101, performing ambient light detection;
optionally, when fingerprint recognition is performed, ambient light may be detected simultaneously, and when fingerprint recognition is not performed, a detection process of the ambient light may be initiated according to a preset time, which is not limited in this embodiment of the present application.
S1102, calculating values S1 and S2 … … Sn detected by the optical sensing pixels in the ambient light pixel area in each light incoming direction; it should be understood that S1-Sn herein is different from S1-Sn appearing above in that S1-Sn mentioned above are a plurality of second pixel regions corresponding to the optical signals of N directions, and S1-Sn herein are optical signal amounts of the optical signals of N directions corresponding to the plurality of second pixel regions, which may also be referred to as light intensity of the ambient optical signal.
The light intensity of the light signal in the embodiment of the present application can be obtained through the light signal received by the optical sensing pixel in the pixel region, and the prior art can be referred to in the specific mode of obtaining the light intensity value.
S1103, determining the maximum value Smax and the minimum value Smin of S1, S2 … … Sn;
s1104, calculating a value S0 of the photo-sensing pixel detection of the first pixel region, and calculating a minimum value Smin0 of Smin and S0; it should be understood that, in the embodiment of the present application, reference may be made to the prior art for the process of performing fingerprint detection on the first pixel region by using the optical signal, and details of the process are not described herein.
S1105, judging whether fingerprint unlocking is in use; optionally, whether fingerprint unlocking is currently performed or not may be judged according to a light spot on the display screen, or whether a fingerprint detection area receives a press or the like may also be judged, which is not limited in the embodiment of the present application.
When the determination result is that the fingerprint unlocking is determined, step S1106 may be performed, otherwise, step S1108 is performed.
S1106, when the fingerprint unlocking is determined, calculating the current ambient light signal as Sh-Smax-S0, and then setting the screen brightness to be L0 according to the Sh;
s1107, the current ambient light signal Sp ═ Sh is recorded, and the screen luminance is L0.
And ending the screen brightness adjusting process.
In the other case of the above-described case,
s1108, if the fingerprint unlocking is determined not to be used, recording the number of times of current ambient light detection as the ith time, and recording the ambient light semaphore of the i times of detection;
s1109, further determining whether i is equal to a preset number m, where the preset number m may be optionally preconfigured according to an empirical value, for example, m may be 3 times, 5 times, and the like, which is not limited in this application.
S1110, if the i is less than the preset number m, continuing to perform next ambient light detection, and abandoning to calibrate the screen brightness;
s1111, if i is larger than or equal to a preset number m, calculating the average value of Sh of m times as the ambient light signal quantity Sh;
s1112, further determining whether the screen brightness adjustment function is used for the first time;
s1113, if the result of the determination is that the screen brightness adjustment function is used for the first time, then according to the steps of S1106 and S1107, the current ambient light signal is calculated to be Sh ═ Smax-S0 according to the formula, then the screen brightness is set to be L0 according to the Sh size, then the current ambient light signal amount Sh and the corresponding screen brightness L0 are recorded, and the screen brightness adjustment process is ended.
Or, as another case:
s1114, if the screen brightness adjusting function is judged not to be used for the first time, obtaining a last ambient light detection result Sp and corresponding screen brightness L0;
s1115 compares the current ambient light signal Sh obtained this time with the previous recorded values Sp and L0, and adjusts the screen brightness to L1 ═ L0+ ((Sh-Sp)/Sp) × L0.
According to the screen brightness adjusting method in the embodiment of the application, the fingerprint identification device can be utilized to detect the ambient light when the fingerprint is detected or the fingerprint is not detected, and the screen brightness is adjusted according to the result of the ambient light detection, so that the dual detection functions of the fingerprint detection and the ambient light detection are realized under the condition of not increasing the cost, further, the adjustment of the screen brightness is realized, and the user experience is improved.
It is to be appreciated that method 1100 of embodiments of the present application can be performed by a processing unit or a processor in an electronic device. In particular, fig. 12 shows a schematic block diagram of an electronic device 1200 of an embodiment of the application. As shown in fig. 12, the electronic device 1200 includes a display 1210, a fingerprint recognition device 1220, and a processing unit 1230. The display screen 1210 may correspond to the display screen in the electronic device in fig. 3 and 9, and is applicable to the related description of the display screen; the fingerprint identification device 1220 may correspond to the fingerprint identification device in the electronic device in fig. 3 and 9, and is suitable for the related description of the fingerprint identification device, and for brevity, will not be described again. Moreover, the processing unit 1230 may be configured to execute the method 1100 of the embodiment of the application, and the processing unit 1230 may be a processing unit or a processor located in the electronic device 1200, or the processing unit 1230 may also be a processing unit or a processor located in the fingerprint identification apparatus 1220, and the embodiment of the application is not limited thereto.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims. Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (21)

1. The utility model provides a fingerprint identification device which characterized in that sets up in electronic equipment's display screen below, the display area of display screen includes fingerprint detection area, fingerprint identification device includes:
a light path layer and an optical fingerprint sensor,
the optical path layer is used for guiding optical signals from N directions of a second area of the fingerprint detection area and optical signals from a first area of the fingerprint detection area to the optical fingerprint sensor, wherein the second area of the fingerprint detection area is arranged around the first area, and N is an integer greater than 1;
the optical fingerprint sensor is arranged below the optical path layer and comprises a first pixel area and a plurality of second pixel areas, the plurality of second pixel areas are arranged around the first pixel area, the first pixel area is used for receiving optical signals from the first area, the plurality of second pixel areas are used for receiving optical signals from the N directions of the second areas, and each second pixel area is used for receiving the optical signal in one direction of the N directions;
wherein the optical signals of the N directions and the optical signal from the first area are used for generating a current ambient light semaphore.
2. The fingerprint recognition device of claim 1, wherein the current ambient light semaphore is used to adjust the brightness of the display screen.
3. The fingerprint recognition device according to claim 1 or 2, wherein the second field of view area corresponding to the plurality of second pixel areas is larger than the first field of view area corresponding to the first pixel area.
4. The fingerprint recognition device according to claim 1 or 2, wherein the plurality of second pixel regions are disposed on different sides of the first pixel region, or,
the plurality of second pixel regions are disposed on the same side of the first pixel region, or,
the plurality of second pixel regions are disposed at corners of the first pixel region.
5. The fingerprint recognition device according to claim 1 or 2, wherein the plurality of second pixel regions are arranged as at least one ring of annular regions around the first pixel region.
6. The grain recognition device according to claim 1 or 2, wherein a second pixel region located on the same side of the first pixel region is configured to receive the optical signal in the same one of the N directions; alternatively, the first and second electrodes may be,
and the second pixel area positioned on the same side of the first pixel area is used for receiving the optical signals in the N directions.
7. The fingerprint recognition device according to claim 1 or 2, wherein the optical path layer comprises:
each light blocking layer in the at least one light blocking layer is provided with an aperture array to form light guide channels in the N directions and light guide channels for forming the optical signals from the first area, the light guide channels in the N directions are used for respectively guiding the optical signals in the N directions to the plurality of second pixel areas, and the light guide channels for the optical signals in the first area are used for guiding the optical signals from the first area to the first pixel area.
8. The fingerprint recognition device of claim 7, wherein the light path layer further comprises:
and the micro-lens array is arranged above the at least one light blocking layer and is used for converging the optical signals in the N directions and the optical signals from the first area to the light guide channel of the at least one light blocking layer.
9. The fingerprint recognition device of claim 7, wherein the at least one light blocking layer is two light blocking layers.
10. The fingerprint recognition device according to claim 1 or 2, wherein the optical path layer comprises:
n lenses, each of the N lenses for converging an optical signal in one of the N directions.
11. The fingerprint recognition device according to claim 1 or 2, further comprising:
the processing unit is used for determining the maximum value and the minimum value of the optical signal quantity according to the optical signals in the N directions and the optical signals from the first area;
and determining the current ambient light signal quantity according to the determined maximum value and the determined minimum value.
12. The fingerprint recognition device of claim 1 or 2, wherein the processing unit is further configured to:
determining that fingerprint pressing operation is currently performed;
and adjusting the brightness of the display screen according to the determined current ambient light semaphore.
13. The fingerprint recognition device of claim 1 or 2, wherein the processing unit is further configured to:
determining that no fingerprint pressing operation is currently performed;
recording the number of times of the current ambient light detection as the ith time, and recording the ambient light signal quantity corresponding to the ith ambient light detection;
determining whether i is greater than or equal to a preset threshold m;
if i is greater than or equal to a preset value m, generating the current ambient light semaphore according to the ambient light semaphore recorded for i times, and adjusting the brightness of the display screen according to the current ambient light semaphore,
alternatively, the first and second electrodes may be,
and if the i is smaller than the preset value m, the brightness of the display screen is abandoned to be adjusted.
14. The fingerprint recognition device of claim 13, wherein the processing unit is further configured to:
determining that the brightness of the display screen is not adjusted for the first time;
acquiring the ambient light semaphore recorded at the previous time;
and adjusting the brightness of the display screen according to the previously recorded ambient light semaphore and the brightness of the display screen corresponding to the previously recorded ambient light semaphore and the current ambient light semaphore.
15. An electronic device, comprising:
a display screen; and
the fingerprint recognition device of any one of claims 1-14, said fingerprint recognition device being disposed below said display screen to enable off-screen optical fingerprint recognition and ambient light detection.
16. An ambient light detection method, applied to an electronic device having a fingerprint recognition device, the fingerprint recognition device being disposed below a display screen of the electronic device, a display area of the display screen including a fingerprint detection area, the fingerprint recognition device being configured to receive optical signals from N directions of a second area of the fingerprint detection area, and optical signals from a first area of the fingerprint detection area, the second area of the fingerprint detection area being disposed around the first area, N being an integer greater than 1, the method comprising:
acquiring N optical semaphore corresponding to the optical signal in the N directions one by one and optical semaphore corresponding to the optical signal from the first region one by one;
and generating the current ambient light semaphore according to the N light semaphores and the light semaphore.
17. The method of claim 16, further comprising:
and adjusting the brightness of the display screen according to the current environment semaphore.
18. The method of claim 16 or 17, wherein said generating the current ambient light semaphore based on the N number of light semaphores and the light semaphore comprises:
determining the maximum value and the minimum value of the optical semaphore according to the N optical semaphores and the optical semaphore;
and determining the current ambient light signal quantity according to the determined maximum value and the determined minimum value.
19. The method according to claim 16 or 17, further comprising:
determining that fingerprint pressing operation is currently performed;
and adjusting the brightness of the display screen according to the determined current ambient light semaphore.
20. The method according to claim 16 or 17, further comprising:
determining that no fingerprint pressing operation is currently performed;
recording the number of times of the current ambient light detection as the ith time, and recording the ambient light signal quantity corresponding to the ith ambient light detection;
determining whether i is greater than or equal to a preset threshold m;
if i is greater than or equal to a preset value m, generating the current ambient light semaphore according to the ambient light semaphore recorded for i times, and adjusting the brightness of the display screen according to the current ambient light semaphore,
alternatively, the first and second electrodes may be,
and if the i is smaller than the preset value m, the brightness of the display screen is abandoned to be adjusted.
21. The method of claim 20, further comprising:
determining that the brightness of the display screen is not adjusted for the first time;
acquiring the ambient light semaphore recorded at the previous time;
and adjusting the brightness of the display screen according to the environment light semaphore recorded last time and the current environment light semaphore.
CN202110258477.XA 2021-03-09 2021-03-09 Fingerprint identification device, electronic equipment and method for detecting ambient light Pending CN112860120A (en)

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