CN110532972B - Electronic device and fingerprint image acquisition method - Google Patents
Electronic device and fingerprint image acquisition method Download PDFInfo
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- CN110532972B CN110532972B CN201910824761.1A CN201910824761A CN110532972B CN 110532972 B CN110532972 B CN 110532972B CN 201910824761 A CN201910824761 A CN 201910824761A CN 110532972 B CN110532972 B CN 110532972B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/40—OLEDs integrated with touch screens
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Abstract
The application provides an electronic device comprising a display panel and a light emitting component, the display panel having a fingerprint identification area for a corresponding optical sensor, the light-emitting component emits light in the fingerprint identification area to form a target light spot, the brightness of a first sub-edge area of the target light spot is smaller than that of a second sub-edge area of the target light spot, wherein the first sub-edge region is a region of the edge region along a polarization direction of the display panel, the second sub-edge region is a region of the edge region outside the first sub-edge region, therefore, even if the light reflected to the optical sensor based on the second sub-edge region is weakened by the polarizer, the brightness difference between the light and the brightness of the first sub-edge region is small, and even the brightness of the light and the brightness of the first sub-edge region are the same, so that the quality of the fingerprint image acquired by the electronic equipment based on the target light spot is high.
Description
Technical Field
The present application relates to the field of electronic devices, and in particular, to an electronic device and a fingerprint image acquisition method.
Background
With the development of the full screen of mobile terminal products, more and more terminal products use the fingerprint identification technology under the screen. However, the fingerprint recognition under the screen of the existing terminal product depends on the uniform light spot emitted by the display panel to perform light supplement, so that the fingerprint image generated on the optical sensor has uneven brightness and poor quality.
Disclosure of Invention
The embodiment of the application provides electronic equipment and a fingerprint image acquisition method.
In one aspect, an embodiment of the present application provides an electronic device, including a display panel and a light emitting component, the display panel has a fingerprint identification area for corresponding to an optical sensor, the light emitting component emits light in the fingerprint identification area to form a target light spot, luminance of a first sub-edge area of an edge area of the target light spot is smaller than luminance of a second sub-edge area of the target light spot, where the first sub-edge area is an area where the edge area is along a polarization direction of the display panel, and the second sub-edge area is an area where the edge area is located outside the first sub-edge area.
On the other hand, the embodiment of the application also provides a fingerprint image acquisition method, which comprises the following steps:
acquiring a fingerprint image acquisition request;
controlling a light-emitting component to form a target light spot in a fingerprint identification area, wherein the brightness of a first sub-edge area of an edge area of the target light spot is smaller than the brightness of a second sub-edge area of the target light spot, the first sub-edge area is an area of the edge area along the polarization direction of the display panel, and the second sub-edge area is an area of the edge area outside the first sub-edge area;
and acquiring reflected light rays in the fingerprint identification area based on the target light spot, and generating a fingerprint image according to the reflected light rays.
The electronic equipment provided by the embodiment of the application enables the light-emitting component to emit light in the fingerprint identification area to form the target light spot, and the brightness of the first sub-edge area of the target light spot is smaller than that of the second sub-edge area of the target light spot, so that even if the light reflected to the optical sensor based on the second sub-edge area is weakened by the polarizer, the difference between the light and the brightness of the first sub-edge area is smaller, even the brightness of the first sub-edge area and the brightness of the second sub-edge area are the same, and the quality of a fingerprint image acquired by the electronic equipment based on the target light spot is higher.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a target spot on a fingerprint identification area of the electronic device shown in FIG. 1;
FIG. 3 is a schematic view of an optical sensor of the electronic device shown in FIG. 1;
FIG. 4 is a schematic diagram of a luminance distortion curve of a collimating mirror of an optical sensor of the electronic device shown in FIG. 1;
FIG. 5 is a graph showing the luminance variation of the target spot in the center-to-edge region of FIG. 2;
FIG. 6 is a schematic view of a light emitting assembly of the electronic device shown in FIG. 1;
FIG. 7 is a schematic diagram of the light emitting assembly shown in FIG. 6 further loaded with a third voltage;
fig. 8 is a flowchart illustrating a fingerprint image acquiring method according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive effort based on the embodiments in the present application are within the scope of protection of the present application.
The application provides an electronic device. The electronic equipment has a fingerprint identification function. The electronic device is a device that is composed of electronic components such as an integrated circuit, a transistor, and an electron tube, and functions by applying electronic technology (including) software, and the common electronic device includes: smart phones, tablet computers, notebook computers, palm computers, Mobile Internet Devices (MID), wearable devices such as smart watches, smart bracelets, pedometers, and the like.
Referring to fig. 1 and fig. 2, the electronic device 100 includes a display panel 1 and a light emitting element 2, the display panel 1 has a fingerprint identification area 11 corresponding to an optical sensor 3, the light emitting element 2 emits light in the fingerprint identification area 11 to form a target light spot 111, a luminance of a first sub-edge area 121 of an edge area 12 of the target light spot 111 is smaller than a luminance of a second sub-edge area 122 of the edge area 12 of the target light spot 111, where the first sub-edge area 121 is an area of the edge area 12 along a polarization direction a of the display panel 1, and the second sub-edge area 122 is an area of the edge area 12 outside the first sub-edge area 121.
The light-emitting component 2 emits light in the fingerprint identification area 11 to form the target light spot 111, and the brightness of the first sub-edge area 121 of the edge area 12 of the target light spot 111 is smaller than the brightness of the second sub-edge area 122 of the edge area 12 of the target light spot 111, so that the light reflected to the optical sensor 3 based on the second sub-edge area 122 has a smaller difference with the brightness of the first sub-edge area 121 even if the light is weakened by the polarizer, and even the two brightnesses are the same, so that the quality of the fingerprint image acquired by the electronic device 100 based on the target light spot 111 is higher.
Alternatively, the display panel 1 may be a liquid crystal display panel 1. Specifically, the display panel 1 is a display tool for displaying a certain electronic document on a screen through a specific transmission device and reflecting the electronic document to human eyes. The display panel 1 comprises cover plate glass, a touch module and a display module. Generally, alignment films are arranged on two glass substrates, liquid crystal is aligned along grooves, the alignment grooves of the glass substrates deviate from 90 degrees, molecules in the liquid crystal are aligned in the same plane like a louver, and the nematic of the molecules is gradually twisted by 90 degrees when the nematic of the molecules transits from one liquid level to the other, namely, the phase difference of the arrangement of the two layers of molecules is 90 degrees. Generally, the most commonly used liquid crystal type is nematic liquid crystal, the molecules are in the shape of slender rod, under the action of different current electric fields, the liquid crystal molecules will be regularly rotated by 90 ° to generate the difference of transmittance, thus the difference of light and shade is generated under the action of power on and off, and each pixel is controlled by this principle to form the required image. Of course, in other embodiments, the display panel 1 may also be an organic light emitting diode display panel.
Alternatively, the fingerprint identification area 11 may be the entire area of the display panel 1, or may be a partial area of the display panel 1. Further, the fingerprint identification area 11 is located in the display area 14 of the display panel 1, and its area is smaller than the area of the display area 14. Specifically, the fingerprint identification area 11 may be understood as a corresponding area on the display panel 1 where fingerprint identification can be performed, and only when a finger of the target object is aligned with the fingerprint identification area 11, a fingerprint image may be collected. Of course, in other embodiments, the fingerprint identification area 11 is the entire display area 14 of the display panel 1. The electronic device 100 may implement full screen fingerprinting.
It should be noted that the finger of the target object may abut against the fingerprint identification area 11, or may be close to the fingerprint identification area 11, in other words, the finger of the target object does not contact the fingerprint identification area 11.
Alternatively, the fingerprint identification area 11 may be circular, rectangular, or other shapes.
Optionally, the area of the fingerprint identification area 11 coincides with the area of the formed target spot 111. In other words, the light emitting member 2 can illuminate the entire fingerprint identification area 11. The target light spot 111 may be identification light for fingerprint identification, and after being irradiated to a finger of a target object, the target light spot is reflected by the target object and reaches the optical sensor 3 through the display panel 1, so that a fingerprint image is formed on the optical sensor 3. Of course, in other embodiments, the area of the target spot 111 may also be smaller than the area of the fingerprint identification area 11.
As can be understood, since the fingerprint identification area 11 coincides with the area of the target light spot 111, the first sub-edge area 121 of the target light spot 111 is the first sub-edge area 121 of the fingerprint identification area 11, and the second sub-edge area 122 of the target light spot 111 is the second sub-edge area 122 of the fingerprint identification area 11.
Alternatively, as shown in fig. 2, the target spot 111 area is a circular area. The target spot 111 has a central region 13 and an edge region 12 surrounding the central region 13. Further, the central area 13 is completely surrounded by the edge areas 12. Of course, in other embodiments, the target spot 111 area may also be a rectangular area, a trapezoidal area, and the like. Of course, in other embodiments, the central region 13 may also be partially surrounded by the edge regions 12.
In the prior art, the light spot formed by the light emitted by the light emitting component 2 in the fingerprint identification area 11 is a uniform light spot. Wherein a uniform spot is to be understood as having substantially the same intensity at each location of the fingerprint identification area 11. The uniform light spot is reflected to the optical sensor 3 by the interaction of the finger of the target object, in the process of light transmission, the light not along the polarization direction a of the polarizer of the display panel 1 is weakened by the polarizer, and the brightness of the light not along the polarization direction a of the polarizer after entering the optical sensor 3 is lower than the brightness of the light along the polarization direction a of the polarizer after entering the optical sensor 3, so that the light intensity of the marginal area 12 of the fingerprint image generated by the optical sensor 3 is inconsistent, thereby reducing the image quality of the fingerprint image.
The brightness of the first sub-edge region 121 of the edge region 12 of the target light spot 111 of the electronic device 100 is less than the brightness of the second sub-edge region 122 of the edge region 12 of the target light spot 111, wherein the first sub-edge region 121 is a region of the edge region 12 along the polarization direction a of the display panel 1, and the second sub-edge region 122 is a region of the edge region 12 outside the first sub-edge region 121, so that even if the light reflected to the optical sensor 3 based on the second sub-edge region 122 is attenuated by the polarizer, the difference between the brightness of the light and the brightness of the first sub-edge region 121 is smaller, or even the brightness of the light and the brightness of the light are the same, so that the quality of the fingerprint image acquired by the electronic device 100 based on the target light spot 111 is higher.
It can be understood that, referring to fig. 1 again, the electronic device 100 further includes an optical sensor 3, where the optical sensor 3 is disposed corresponding to the fingerprint identification area 11 and is used for acquiring a fingerprint image of a target acquisition object.
Specifically, the optical sensor 3 generally refers to a device that can sense light energy from ultraviolet light to infrared light and convert the light energy into an electrical signal. The optical sensor 3 can be designed to be adjustable in block shape, ring shape and point shape, and can also be in other adjustment forms, so that the adaptability adjustment can be carried out according to the actual light spot pattern light supplement shape, and the optical sensor 3 can adapt to more complex use environments.
The light signal recognized by the optical sensor 3 may be visible light or invisible light.
For example, the light signal is visible light, and the photosensitive layer of the optical sensor 3 generates a photoelectric effect when sensing the visible light. For example, the photosensitive layer of the optical sensor 3 may be a silicon-rich compound, including but not limited to silicon-rich silicon oxide (SiOx), silicon-rich silicon nitride (SiNy), silicon-rich silicon oxynitride (SiOxNy), and the like, where x and y are positive integers, such as x ═ 2 and y ═ 2. The input end of the optical sensor 3200 is made of a transparent conductive material. The transparent conductive material may be, but is not limited to, Indium Tin Oxide (ITO). The light signal enters the photosensitive layer of the optical sensor 3200 through the input end of the optical sensor 3.
It can be understood that, referring to fig. 1 again, the electronic device 100 further includes a controller 5, the controller 5 is electrically connected to the light emitting assembly 2, and the controller 5 controls the intensity of the light emitted by the light emitting assembly 2, so that the brightness of the first sub-edge area 121 of the edge area 12 of the target light spot 111 is smaller than the brightness of the second sub-edge area 122 of the edge area 12 of the target light spot 111.
Specifically, referring to fig. 3, since the luminance of the first sub-edge area 121 of the target spot 111 is less than the luminance of the second sub-edge area 122 of the edge area 12 of the target spot 111, when the target object is located in the fingerprint identification area 11, the target spot 111 of the fingerprint identification area 11 is reflected to the optical sensor 3 by the target object, and a difference between the luminance of the first photosensitive cell group 31, which is a photosensitive cell corresponding to the first sub-edge area 121, of the optical sensor 3 and the luminance of the second photosensitive cell group 32, which is a photosensitive cell corresponding to the second sub-edge area, of the optical sensor 3 is 0 to 50. Optionally, when the target object is located in the fingerprint identification area 11, the target light spot 111 of the fingerprint identification area 11 is reflected to the optical sensor 3 by the target object, and a difference between the brightness of the light sensing unit of the optical sensor 3 corresponding to the first sub-edge area 121 and the brightness of the light sensing unit of the optical sensor 3 corresponding to the second sub-edge area 122 is 0. In other words, the brightness of the light sensing unit of the optical sensor 3 corresponding to the first sub-edge area 121 is the same as the brightness of the light sensing unit of the optical sensor 3 corresponding to the second sub-edge area 122. Correspondingly, the light emitting assembly 2 is controlled to emit light such that the brightness of the light emitted to the first sub-edge region 121 is less than the brightness of the light emitted to the second sub-edge region 122. For example, if the brightness of the polarizer weakened to the light in the non-polarization direction a is 50 brightness values, the brightness of the light in the first sub-edge region 121 is 100 brightness values, and the brightness of the light in the second sub-edge region 122 is 150 brightness values, so that when the target object interacts with the target light spot 111 and is incident on the optical sensor 3, the brightness of the light sensing unit on the optical sensor 3 corresponding to the first sub-edge region 121 is 100 brightness values, and the brightness of the light sensing unit on the optical sensor 3 corresponding to the second sub-edge region 122 is 100 brightness values, so that the brightness of the first light sensing unit group 31 and the second light sensing unit group 32 on the optical sensor 3 are the same.
The principle of fingerprint identification of this embodiment is as follows: when a target collection object needs to collect fingerprints, a finger of the target collection object is placed in the fingerprint identification area 11, the controller 5 controls the light-emitting component 2 to emit light rays with different light intensities to the fingerprint identification area 11 corresponding to different areas to form a target light spot 111, so that the brightness of the first sub-edge area 121 of the target light spot 111 is smaller than that of the second sub-edge area 122, the target light spot 111 forms identification light, in the period, the ridge (the convex part) of the finger fingerprint is in direct contact with the fingerprint identification area 11, thereby destroying the propagation of the identification light in the waveguide, causing the light energy loss finally reaching the optical sensor 3, the valley (the concave part) of the fingerprint is not in contact with the identification area, thereby causing no light intensity loss, the light rays carrying the information of the ridge and the valley of the finger finally reach the optical sensor 3, the optical sensor 3 judges the ridge and the valley according to the intensity of the light energy of the receiving area, clear fingerprint images are generated after image processing, and fingerprint identification is realized.
Because the brightness of the first sub-edge region 121 of the target light spot 111 is less than the brightness of the second sub-edge region 122 of the edge region 12 of the target light spot 111, when the target object is located in the fingerprint identification region 11, the target light spot 111 of the fingerprint identification region 11 is reflected to the optical sensor 3 by the target object, and a difference between the brightness of the photosensitive unit corresponding to the first sub-edge region 121, that is, the first photosensitive unit group 31, of the optical sensor 3 and the brightness of the photosensitive unit corresponding to the second sub-edge region 122, that is, the second photosensitive unit group 32, of the optical sensor 3 is smaller and closer to zero, so that the fingerprint image generated by the optical sensor 3 corresponds to the first sub-edge region 121 and the second sub-edge region 122 better.
Further, referring to fig. 1 again, the target light spot 111 further has a central area 13, the edge area 12 surrounds the central area 13, the brightness of the target light spot 111 along the direction from the central area 13 to the edge area 12 gradually decreases, when the target collecting object is located in the fingerprint identification area 11, the target light spot 111 in the fingerprint identification area 11 is reflected to the optical sensor 3 by the target collecting object, and the difference between the brightness collected by the optical sensor 3 corresponding to the central area 13 and the brightness collected by the optical sensor 3 corresponding to the edge area 12 is 0-50.
It can be understood that, referring to fig. 4 and fig. 5 together, fig. 4 is a luminance distortion curve of the collimating mirror of the optical sensor 3, and fig. 5 is a luminance variation curve of the target spot 11 along the direction from the central area to the edge area. The change of the brightness change curve of the target spot 111 along the direction from the central area 13 to the edge area 12 is opposite to the change of the brightness distortion curve of the collimating mirror of the optical sensor 3.
By making the brightness change curve of the target light spot 111 opposite to the brightness distortion curve of the collimating mirror, the brightness change of the edge area 12 and the central area 13 on the optical sensor 3 is smaller, so that the background brightness of the central area 13 and the edge area 12 corresponding to the formed fingerprint image is more uniform, and the signal-to-noise ratio of the edge area 12 corresponding to the fingerprint image is improved.
Specifically, the optical sensor 3 includes a photosensitive unit and a collimator lens. The collimating lens is used for focusing light rays incident to the photosensitive unit from the display panel 1 and then transmitting the light rays to the photosensitive unit, and the focusing degree of the collimating lens corresponding to the central area 13 to the light rays is greater than the focusing degree of the collimating lens corresponding to the edge area 12 to the light rays. If the target light spot 111 is a uniform light spot, due to the influence of the optical performance of the collimator lens, the portion corresponding to the central area 13 in the fingerprint image obtained by the optical sensor 3 is brighter, and the portion corresponding to the edge area 12 is darker, so that the portion corresponding to the edge area 12 in the fingerprint image obtained by the optical sensor 3 is blurred, and the image quality is poor.
In this embodiment, the change of the brightness variation curve of the target light spot 111 along the direction from the central area 13 to the edge area 12 is opposite to the change of the brightness distortion curve of the collimating mirror of the optical sensor 3, so that the difference between the brightness of the portion of the fingerprint image obtained by the optical sensor 3 corresponding to the central area 13 and the brightness of the portion corresponding to the edge area 12 is close to zero, thereby making the brightness of the background in the fingerprint image obtained by the optical sensor 3 uniform, and improving the quality of the fingerprint image.
For example, the brightness of the center region 13 is controlled to be 100 brightness values, the brightness of the first sub-edge region 121 is controlled to be 150 brightness values, the brightness of the second sub-edge region 122 is controlled to be 200 brightness values, the brightness of the center region 13 gradually decreases from the brightness of the edge region 12, the brightness of the fingerprint image obtained by the optical sensor 3 based on the target light spot 111 corresponding to the center region 13 is equal to 100 brightness values or close to 100 brightness values, the brightness of the fingerprint image corresponding to the first sub-edge region 121 may be 100 brightness values influenced by the collimating mirror, and the brightness of the fingerprint image corresponding to the second sub-edge region 122 may be 100 brightness values influenced by the collimating mirror and the polarizer. The brightness of each area of the fingerprint image obtained by the optical sensor 3 based on the target light spot 111 is approximately the same, in other words, the brightness of the background of the fingerprint image is relatively uniform, and the quality of the fingerprint image is improved. The brightness values of the respective regions are merely examples for easy understanding.
The electronic device 100 provided in the embodiment of the present application further makes the change of the brightness change curve from the center of the central area 13 to the edge area 12 of the target light spot 111 complement the change of the brightness distortion curve of the collimating mirror, so that the optical sensor 3 obtains the uniform brightness of the portion of the fingerprint image corresponding to the central area 13 and the edge area 12 based on the target light spot 111, the quality of the fingerprint image is further improved, and the sensitivity during fingerprint identification is improved.
Further, referring to fig. 3 again, the optical sensor 3 has a first photosensitive cell group 31 aligned with the first sub-edge region 121 and a second photosensitive cell group 32 aligned with the second sub-edge region 122, and the controller 5 is further configured to control the photosensitive performance of the second photosensitive cell group 32 to be better than that of the first photosensitive cell group 31.
Specifically, the performance parameters that the photosensitivity of the second photosensitive unit group 32 is better than that of the first photosensitive unit group 31 mean: the overall performance parameter of the second photosensitive cell group 32 is better than that of the first photosensitive cell group 31. In other words, the performance parameters of some of the photosensitive cells in the second photosensitive cell group 32 may be worse than those of some of the photosensitive cells in the first photosensitive cell group 31, but the overall parameters of the second photosensitive cell group 32 are better than those of the first photosensitive cell group 31. The performance parameters are expressed as gain of the photosensitive unit, exposure time of the photosensitive unit, arrangement density of the photosensitive unit, sensitivity of the photosensitive unit, and the like. In this embodiment, the sensitivity performance of the second photosensitive unit group 32 is better than the performance parameter of the first photosensitive unit group 31, so that the difference between the definitions of the portion corresponding to the first sub-edge region 121 and the portion corresponding to the second sub-edge region 122 in the fingerprint image collected by the optical sensor 3 is smaller than the preset difference, where the preset difference is equal to the sensitivity performance of the second photosensitive unit group 32 equal to the performance parameter of the first photosensitive unit group 31, and the difference between the definitions of the portion corresponding to the first sub-edge region 121 and the portion corresponding to the second sub-edge region 122 in the fingerprint image.
Optionally, the controller 5 is further configured to control a gain of the sensing units in the second sensing unit group 32 to be larger than a gain of the sensing units in the first sensing unit group 31. The light sensing performance is determined by at least the gain of the light sensing unit, and the light sensing performance is proportional to the gain, and the controller 5 is configured to control the gain of the second light sensing unit group 32 to be larger than the gain of the first light sensing unit group 31. Here, "gain" refers to amplification factor. When the gain parameters of each photosensitive unit on the optical sensor 3 are specifically designed, a planar image without a fingerprint is firstly calibrated and acquired, then the brightness parameter of each photosensitive unit corresponding to the image is acquired, and then the controller 5 controls the gain of each photosensitive unit at different positions to adjust the gain parameters of all the photosensitive units to be consistent, so that all the photosensitive units are in an initialized state. And then, acquiring a plane image without the fingerprint again, recording the image and the gain parameters of all the photosensitive units, and taking the image and the gain parameters of all the photosensitive units as calibration parameters of the subsequently acquired fingerprint image. Through the luminance parameter of each sensitization unit that corresponds when gathering no fingerprint image, the gain parameter adjustment of all sensitization units is unanimous to make all sensitization units be in the initialized state, as the reference of regulation in proper order, make things convenient for the follow-up gain parameter to the sensitization unit to adjust, can guarantee that the gain parameter of the sensitization unit of each different positions accords with user's demand, and help improving the definition that the fingerprint image of gathering aims at second marginal zone 12, and then help improving fingerprint identification's sensitivity.
Further, referring to fig. 3 again, the optical sensor 3 further has a third photosensitive unit group 33 aligned with the central area 13, and the controller 5 is further configured to control the photosensitive performances of the second photosensitive unit group 32 and the first photosensitive unit group 31 to be better than the photosensitive performances of the third photosensitive unit group 33.
In this embodiment, the sensitivity performance of the third photosensitive unit group 33 is better than the performance parameter of the first photosensitive unit group 31, so that the difference between the definitions of the portion corresponding to the first sub-edge region 121 and the portion corresponding to the second sub-edge region 122 in the fingerprint image collected by the optical sensor 3 is smaller than the preset difference, where the preset difference is equal to the sensitivity performance of the third photosensitive unit group 33 equal to the performance parameters of the first photosensitive unit group 31 and the second photosensitive unit group 32, and the difference between the definitions of the portion corresponding to the edge region 12 and the portion corresponding to the central region 13 in the fingerprint image.
Further, referring to fig. 6, the light emitting device 2 may be a light emitting layer 18 of the display panel 1. The display panel 1 includes an anode layer 17, a light emitting layer 18, and a cathode layer 19, which are sequentially stacked, the light emitting layer 18 forms the light emitting assembly 2, a driving voltage is applied between the anode layer 17 and the cathode layer 19 to enable the light emitting layer 18 to emit light, the controller 5 controls the light emitting layer 18 corresponding to the first sub-edge region 121 to be applied with a first voltage U1, and controls the light emitting layer 18 corresponding to the second sub-edge region 122 to be applied with a second voltage U2, where a voltage value of the first voltage U1 is less than a voltage value of the second voltage U2. The greater the driving voltage applied to the light-emitting layer 18, the greater the luminance of the light emitted by the light-emitting layer 18. Of course, in other embodiments, the light emitting assembly 2 may also be a light source device disposed outside the display panel 1.
Specifically, the light-emitting layers 18 corresponding to different regions of the fingerprint identification region 11, that is, the target light spot 111, are controlled by using independent driving voltages, and when the voltage value of the first voltage U1 applied to the light-emitting layer 18 corresponding to the first sub-edge region 121 of the target light spot 111 is smaller than the voltage value of the second voltage U2 recorded in the light-emitting layer 18 corresponding to the second sub-edge region 122 of the target light spot 111, under the same other conditions, the light-emitting luminance of the light-emitting layer 18 corresponding to the first sub-edge region 121 is smaller than the light-emitting luminance of the light-emitting layer 18 corresponding to the second sub-edge region 122, which is beneficial to improving the definition of the acquired fingerprint image, and further improving the sensitivity of fingerprint identification.
Specifically, referring to fig. 7, the controller 5 further controls the light emitting layer 18 corresponding to the central region 13 to be applied with a third voltage U3, wherein a voltage value of the third voltage U3 is smaller than a voltage value of the first voltage U1. When the voltage value of the third voltage U3 applied to the light-emitting layer 18 corresponding to the central area 13 of the target spot 111 area is smaller than the voltage value of the first voltage U1 recorded in the light-emitting layer 18 corresponding to the first sub-edge area 121 of the target spot 111 area, under the same other conditions, the light-emitting luminance of the light-emitting layer 18 corresponding to the central area 13 is smaller than the light-emitting luminance of the light-emitting layer 18 corresponding to the edge area 12, which is beneficial to improving the definition of the acquired fingerprint image and further improving the sensitivity of fingerprint identification.
By forming the light emitting components 2 from the light emitting layer 18 of the display panel 1, control of the different brightness of the respective areas of the light emitting layer 18 is facilitated, thereby improving the reliability of use of the electronic device 100.
In an optional embodiment, the light emitting layer 18 is provided with a red sub-pixel, a green sub-pixel and a blue sub-pixel, and when the optical sensor 3 collects a fingerprint image of a target collection object, the controller 5 is further configured to control the red sub-pixel at a position where the light emitting layer 18 aligns with the first sub-edge region 121 and/or a position where the light emitting layer 18 aligns with the second sub-edge region 122 not to emit light.
Specifically, it can make the background noise point of display panel 1 and the fingerprint image of gathering more balanced to set up green sub pixel in fingerprint identification district 11, that is the corresponding position of target facula 111, and blue sub pixel can make the contrast of the fingerprint image of gathering more obvious, consequently, adopt the mode that green sub pixel and blue sub pixel interval were arranged, can improve the contrast of the fingerprint image of gathering, further improve the quality of the fingerprint image of gathering, help improving the identification precision of optics fingerprint.
In one embodiment, the light emitting areas of the green sub-pixel and the blue sub-pixel are consistent. At the moment, the noise of the collected fingerprint image is low, the contrast is high, the collected fingerprint image is more harmonious, and the identification precision of the optical fingerprint is improved.
Referring to fig. 8, fig. 8 is a schematic flowchart of a fingerprint image acquiring method according to an embodiment of the present application, where the fingerprint image acquiring method includes:
110: and acquiring a fingerprint image acquisition request.
Specifically, when a finger of the target object is placed in the fingerprint identification area 11, the electronic device 100 generates a fingerprint image acquisition request.
120: the light emitting assembly 2 is controlled to form a target light spot 111 in the fingerprint identification area 11, wherein the brightness of a first sub-edge area 121 of an edge area 12 of the target light spot 111 is less than the brightness of a second sub-edge area 122 of the edge area 12 of the target light spot 111, wherein the first sub-edge area 121 is an area of the edge area 12 along the polarization direction a of the display panel 1, and the second sub-edge area 122 is an area of the edge area 12 outside the first sub-edge area 121.
Specifically, the specific structure of the light emitting element 2 can be referred to the structure of the light emitting element 2 in the electronic device 100 mentioned in the foregoing embodiment, and details are not repeated here.
As can be understood, the light emitting component 2 emits light in the fingerprint identification area 11 to form a light spot with uniform brightness; reflected light rays corresponding to the light spots are obtained in the fingerprint identification area 11 through the optical sensor 3; generating an initial fingerprint image corresponding to the reflected light by the optical sensor 3, and acquiring a first brightness value, a second brightness value and a central brightness value in the initial fingerprint image, where the first brightness value is a brightness value of the initial fingerprint image aligned with the first sub-edge region 121, the second brightness value is a brightness value of the initial fingerprint image aligned with the second sub-edge region 122, and the central brightness value is a brightness value of the initial fingerprint image aligned with the center of the central region 13; and controlling the light-emitting component 2 to adjust the light-emitting brightness according to the proportional relation among the first brightness value, the second brightness value and the central brightness value, and emitting light in the fingerprint identification area 11 through the adjusted light-emitting component 2 to form the target light spot 111.
Specifically, the controller 5 controls the light emitting assembly 2 to emit light with uniform brightness toward the fingerprint identification area 11 to form a uniform light spot. The fingerprint image acquired by the optical sensor 3 based on the uniform spot is defined as an initial fingerprint image. The controller 5 obtains brightness values of the initial fingerprint image aligned to the central area 13, the first sub-edge area 121, and the second sub-edge area 122 of the light spot, which correspond to the central brightness value, the first brightness value, and the second brightness value, respectively, obtains a difference value between the first brightness value and the brightness value of the first sub-edge area 121 of the uniform light spot as a first difference value, obtains a difference value between the second brightness value and the brightness value of the second sub-edge area 122 of the uniform light spot as a second difference value, adjusts the light emitting intensity of each area of the light emitting assembly 2 according to the first difference value and the second difference value, and the light emitting assembly 2 emits light toward the fingerprint identification area 11 based on the adjusted light emitting intensity to form the target light spot 111, wherein the brightness of the first sub-edge area 121 of the edge area 12 of the target light spot 111 is smaller than the brightness of the second sub-edge area 122 of the edge area 12 of the target light spot 111.
Further, the target spot 111 further has a central area 13, the edge area 12 surrounds the central area 13, and the brightness of the target spot 111 gradually decreases along the direction from the central area 13 to the edge area 12. The method for adjusting the brightness of the target light spot 111 along the direction from the central region 13 to the edge region 12 may refer to the method for adjusting the brightness of the first sub-edge region 121 and the second sub-edge region 122, and is not described herein again.
130: reflected light rays are obtained in the fingerprint identification area 11 based on the target light spots 111, and a fingerprint image is generated according to the reflected light rays.
Specifically, the brightness difference between the portion of the fingerprint image, which is obtained by the light sensor based on the target light spot 111 and corresponds to the first sub-edge region 121, and the portion of the fingerprint image, which corresponds to the second sub-edge region 122, is close to zero, so that the brightness of the background in the fingerprint image obtained by the optical sensor 3 is uniform, and the quality of the fingerprint image is improved.
Further, the difference between the brightness of the portion of the fingerprint image obtained by the optical sensor 3 corresponding to the central area 13 and the brightness of the portion corresponding to the edge area 12 is close to zero, so that the brightness of the background in the fingerprint image obtained by the optical sensor 3 is uniform, and the quality of the fingerprint image is improved.
According to the image obtaining method provided by the embodiment of the application, the target light spot 111 is formed by emitting light in the fingerprint identification area 11, and the brightness of the first sub-edge area 121 of the edge area 12 of the target light spot 111 is smaller than the brightness of the second sub-edge area 122 of the edge area 12 of the target light spot 111, so that even if the light reflected to the optical sensor 3 based on the second sub-edge area 122 is weakened by the polarizer, the difference between the light and the brightness of the first sub-edge area 121 is smaller, and even the brightness of the light and the brightness of the first sub-edge area 121 are the same, so that the quality of the fingerprint image obtained by the electronic device 100 based on the target light spot 111 is higher.
The foregoing is an implementation of the embodiments of the present application, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the principle of the embodiments of the present application, and these modifications and decorations are also regarded as the protection scope of the present application.
Claims (11)
1. An electronic device is characterized by comprising a display panel and a light-emitting component, wherein the display panel is provided with a fingerprint identification area corresponding to an optical sensor, the light-emitting component emits light in the fingerprint identification area to form a target light spot, the brightness of a first sub-edge area of an edge area of the target light spot is smaller than that of a second sub-edge area of the target light spot, the first sub-edge area is an area of the edge area along the polarization direction of the display panel, and the second sub-edge area is an area of the edge area outside the first sub-edge area;
wherein, the electronic equipment still includes the controller, the controller electricity is connected in the light emitting component, the target facula still has the central zone, the light emitting component is at the fingerprint identification district emission light forms the target facula, include: the light-emitting component emits light in a fingerprint identification area to form light spots with uniform brightness, the optical sensor acquires reflected light corresponding to the light spots in the fingerprint identification area, the optical sensor generates an initial fingerprint image corresponding to the reflected light, the controller acquires a first brightness value, a second brightness value and a central brightness value in the initial fingerprint image, the first brightness value is a brightness value of the initial fingerprint image aligned with the first sub-edge area, the second brightness value is a brightness value of the initial fingerprint image aligned with the second sub-edge area, the central brightness value is a brightness value of the initial fingerprint image aligned with the center of the central area, and the controller controls the light-emitting component to adjust the light-emitting brightness according to a proportional relation among the first brightness value, the second brightness value and the central brightness value, and emitting light rays in the fingerprint identification area through the adjusted light emitting assembly to form the target light spot.
2. The electronic device of claim 1, further comprising an optical sensor disposed corresponding to the fingerprint identification area for capturing a fingerprint image of a target capture object, wherein when the target capture object is located in the fingerprint identification area, a target light spot of the fingerprint identification area is reflected to the optical sensor by the target capture object, and a difference between a brightness of the light sensing unit corresponding to the first sub-edge area of the optical sensor and a brightness of the light sensing unit corresponding to the second sub-edge area of the optical sensor is 0-50.
3. The electronic device of claim 2, wherein the edge region surrounds the central region, the brightness of the target light spot gradually increases along a direction from the central region to the edge region, when the target capture object is located in the fingerprint identification region, the target light spot of the fingerprint identification region is reflected to the optical sensor by the target capture object, and a difference between the brightness captured by the optical sensor corresponding to the central region and the brightness captured by the optical sensor corresponding to the edge region is 0-50.
4. The electronic device of claim 3, wherein a change in a luminance variation curve of the target spot along a direction from the central region to the edge region is opposite to a change in a luminance distortion curve of a collimating mirror of the optical sensor.
5. The electronic device of claim 2, wherein the controller controls the intensity of the light emitted from the light emitting assembly so that the brightness of a first sub-edge region of the target spot is less than the brightness of a second sub-edge region of the target spot.
6. The electronic device according to claim 5, wherein the display panel includes an anode layer, a light emitting layer, and a cathode layer sequentially stacked, the light emitting layer forms the light emitting assembly, a driving voltage is applied between the anode layer and the cathode layer to cause the light emitting layer to emit light, and the controller controls the light emitting layer corresponding to the first sub-edge region to be applied with a first voltage and controls the light emitting layer corresponding to the second sub-edge region to be applied with a second voltage, wherein a voltage value of the first voltage is smaller than a voltage value of the second voltage.
7. The electronic device of claim 6, wherein the light emitting layer is provided with a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the controller is further configured to control the red sub-pixel of the portion of the light emitting layer aligned with the first sub-edge region and/or the portion of the light emitting layer aligned with the second sub-edge region not to emit light when the optical sensor captures a fingerprint image of a target capture object.
8. The electronic device of claim 2, wherein the optical sensor has a first photosensitive cell group aligned with the first sub-edge region and a second photosensitive cell group aligned with the second sub-edge region, and the controller is further configured to control a photosensitive performance of the second photosensitive cell group to be better than a photosensitive performance of the first photosensitive cell group.
9. The electronic device of claim 8, wherein the controller is further configured to control a gain of photosites in the second set of photosites to be greater than a gain of photosites in the first set of photosites.
10. A fingerprint image acquisition method, characterized in that the method comprises:
acquiring a fingerprint image acquisition request;
controlling a light-emitting component to form a target light spot in a fingerprint identification area, wherein the brightness of a first sub-edge area of an edge area of the target light spot is smaller than the brightness of a second sub-edge area of the target light spot, the first sub-edge area is an area of the edge area along the polarization direction of a display panel, and the second sub-edge area is an area of the edge area outside the first sub-edge area;
acquiring reflected light rays in the fingerprint identification area based on the target light spots, and generating a fingerprint image according to the reflected light rays;
wherein the target light spot further has a central area, and the controlling the light emitting component to form the target light spot in the fingerprint identification area comprises:
light is emitted in the fingerprint identification area through the light emitting assembly to form light spots with uniform brightness;
acquiring reflected light corresponding to the light spots in the fingerprint identification area through an optical sensor;
generating an initial fingerprint image corresponding to the reflected light through the optical sensor, and acquiring a first brightness value, a second brightness value and a central brightness value in the initial fingerprint image, where the first brightness value is a brightness value of the initial fingerprint image aligned with the first sub-edge region, the second brightness value is a brightness value of the initial fingerprint image aligned with the second sub-edge region, and the central brightness value is a brightness value of the initial fingerprint image aligned with the center of the central region;
and controlling the light-emitting component to adjust the brightness according to the proportional relation among the first brightness value, the second brightness value and the central brightness value, and emitting light rays in the fingerprint identification area through the adjusted light-emitting component to form the target light spot.
11. The fingerprint image obtaining method according to claim 10, wherein the edge area surrounds the central area, and the brightness of the target light spot gradually increases along a direction from the central area to the edge area.
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| CN115706751A (en) * | 2021-08-09 | 2023-02-17 | 北京小米移动软件有限公司 | Image acquisition method and device, electronic equipment and storage medium |
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