CN111095283B

CN111095283B - Fingerprint detection device and electronic equipment

Info

Publication number: CN111095283B
Application number: CN201980004259.4A
Authority: CN
Inventors: 张思超; 蔡斐欣; 柳玉平
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2023-09-12
Anticipated expiration: 2039-09-06
Also published as: WO2021042395A1; CN111095283A

Abstract

Fingerprint detection device and electronic equipment, can increase the light signal intensity that the device received, improve fingerprint image quality and recognition effect, this fingerprint detection device is used for setting up in electronic equipment's display screen below, includes: the micro-lens array comprises a plurality of circular micro-lenses, each circular micro-lens in the plurality of circular micro-lenses is adjacent to six circular micro-lenses, and the connecting line of the centers of the six circular micro-lenses forms a regular hexagon; the pixel array is arranged below the micro lens array and comprises a plurality of pixels, the pixels are in one-to-one correspondence with the circular micro lenses, the pixels are used for receiving light signals converged by the corresponding circular micro lenses, and the light signals are light signals reflected or scattered by fingers and are used for detecting fingerprint information of the fingers; the plurality of pixels are N groups of pixels, each group of pixels in the N groups of pixels comprises M adjacent pixels, and the light signals received by the M pixels are used for forming one pixel in the fingerprint image of the finger, and M, N is a positive integer greater than 1.

Description

Fingerprint detection device and electronic equipment

Technical Field

The present application relates to the field of optical fingerprint technology, and more particularly, to a fingerprint detection apparatus, method, and electronic device.

Background

The principle of the conventional under-screen fingerprint optical system of an Organic Light-Emitting Diode (OLED) is that an OLED screen is utilized to emit Light to irradiate a finger, and an optical signal reflected by the finger is received by a fingerprint detection device and fingerprint identification is performed after passing through the screen. However, the light intensity of the OLED screen is limited, and the finger absorbs and scatters the light signal, so that the light signal received by the traditional fingerprint detection device after being reflected by the finger is weaker, the fingerprint image quality is lower, and the fingerprint identification effect is poor.

Therefore, how to increase the intensity of the optical signal received by the fingerprint detection device, and improve the fingerprint image quality and the recognition effect is a problem to be solved urgently.

Disclosure of Invention

The embodiment of the application provides a fingerprint detection device and electronic equipment, which can increase the intensity of an optical signal received by the fingerprint detection device, thereby improving the quality of fingerprint images and the identification effect.

In a first aspect, a fingerprint detection apparatus is provided, configured to be disposed below a display screen of an electronic device, including:

a microlens array including a plurality of circular microlenses, each circular microlens of the plurality of circular microlenses being adjacent to six circular microlenses, a line connecting centers of the six circular microlenses constituting a regular hexagon;

The pixel array is arranged below the micro-lens array and comprises a plurality of pixels, the pixels are in one-to-one correspondence with the plurality of round micro-lenses, the pixels are used for receiving light signals converged by the corresponding round micro-lenses, and the light signals are light signals reflected or scattered by fingers and are used for detecting fingerprint information of the fingers;

the plurality of pixels are N groups of pixels, each group of pixels in the N groups of pixels comprises M adjacent pixels, and the optical signals received by the M pixels are used to form a pixel value in the fingerprint image of the finger, wherein M, N is a positive integer greater than 1.

According to the technical scheme, the specific arrangement mode of the plurality of circular microlenses is adopted, so that the area ratio of the plurality of circular microlenses in the microlens array can be increased, the intensity of optical signals received by the microlens array is increased, and the quality of fingerprint images and fingerprint identification performance are improved. In addition, the optical signals received by the pixels are used for forming a pixel value in the fingerprint image, so that the fingerprint image is conveniently collected, and the quality of the fingerprint image and the performance of the fingerprint detection device can be further improved.

In one possible implementation, the plurality of pixels is a plurality of rectangular pixels.

In one possible implementation, when M is an even number, the relative positional relationship of M pixels in each of the N groups of pixels is the same.

In one possible implementation, when m=4, the line of centers of 4 pixels forms a diamond.

In one possible implementation manner, when M is an odd number, the relative positional relationship of M pixels in two adjacent groups of pixels located in the same row in the N groups of pixels is different; alternatively, the relative positional relationship of M pixels in two adjacent groups of pixels in the same column in the N groups of pixels is different.

In one possible implementation, when m=3, the line of the centers of 3 pixels constitutes a regular triangle.

In one possible implementation, n×m pixels of the N groups of pixels are configured to receive light signals in the same direction to form a fingerprint image, and a sum of the light signals received by the M pixels is configured to form a pixel value in the fingerprint image.

By adopting the scheme of the embodiment of the application, when the sum of the optical signals received by the M pixels is used for forming one pixel value in the fingerprint image, the reliability and the production yield of the fingerprint detection device can be improved.

In one possible implementation, n×m pixels of the N groups of pixels are configured to receive optical signals in M different directions to form M fingerprint images, and N pixels of the N groups of pixels are configured to receive optical signals in one direction to form one fingerprint image of the M fingerprint images, where the N pixels respectively belong to the N groups of pixels.

By adopting the scheme of the embodiment of the application, the optical signals in different directions are acquired through N groups of pixels, so that M different fingerprint images are formed, and the requirements of different scenes are met. In addition, the M fingerprint images can be fused and optimized to obtain a new optimized fingerprint image, and the fingerprint image quality and the recognition performance of the fingerprint detection device can be further improved.

In one possible implementation, the optical signal received by one of the M pixels is used to form a pixel value in a fingerprint image.

In one possible implementation, the M pixels include first pixels for receiving light signals in a first direction, and a sum of the light signals received by the X first pixels in the X groups of pixels in the N groups of pixels is used to form a pixel value in a fingerprint image, where 1 < X < N, and X is a positive integer.

In one possible implementation, the distances between any two adjacent circular microlenses in the plurality of circular microlenses are equal.

In one possible implementation, a distance between any two adjacent circular microlenses of the plurality of circular microlenses is 0 or more.

In one possible implementation, the plurality of pixels are staggered with respect to each other.

In one possible implementation, the width of the pixel is smaller than the diameter of the circular microlens.

In one possible implementation, the fingerprint detection device further comprises: a processing unit;

the processing unit is used for carrying out interpolation processing on the fingerprint image so as to form an optimized fingerprint image.

In a possible implementation, the processing unit is configured to:

and adjusting an interpolation mode according to the size of the fingerprint image, and performing interpolation processing on the fingerprint image to form a square optimized fingerprint image.

The square optimized fingerprint image obtained through the difference value processing has better quality and is more convenient for fingerprint identification.

In one possible implementation, the fingerprint detection device further comprises: the at least one light blocking layer is arranged between the micro lens array and the pixel array to form a plurality of light guide channels;

each light guide channel of the plurality of light guide channels corresponds to one pixel of the pixel array and one circular microlens of the microlens array.

In one possible implementation, the plurality of light guide channels are used to pass light signals in the same direction, or,

the plurality of light guide channels are N groups of light guide channels, each group of light guide channels in the N groups of light guide channels comprises M light guide channels, and the M light guide channels are used for passing through M light signals in different directions.

In a second aspect, an electronic device is provided, comprising a display screen and a fingerprint detection device as in the first aspect or any of the possible implementation forms of the first aspect, wherein the fingerprint detection device is arranged below the display screen.

In the electronic equipment, the fingerprint detection device is arranged below the display screen, so that the fingerprint identification under the screen can be realized based on the fingerprint detection device, and the intensity of the optical signal received by the fingerprint detection device can be increased, so that the fingerprint image quality and the identification effect are improved.

Drawings

Fig. 1 is a schematic structural diagram of an electronic device to which an embodiment of the present application is applied.

Fig. 2 is a schematic structural view of a fingerprint detection device according to an embodiment of the present application.

Fig. 3 is a top view of a microlens array and a pixel array of the finger print detection device of fig. 2.

Fig. 4 is a schematic structural view of a fingerprint detection device according to an embodiment of the present application.

Fig. 5 is a top view of the microlens array and pixel array of the finger print detection device of fig. 4.

Fig. 6 is another top view of the microlens array and pixel array of the finger print detection device of fig. 4.

Fig. 7 is a schematic diagram of an arrangement of adjacent 4 groups of pixels in N groups of pixels according to an embodiment of the present application.

Fig. 8 is a schematic diagram of another arrangement of adjacent 4 sets of pixels in N sets of pixels according to an embodiment of the present application.

Fig. 9 is a schematic diagram of another arrangement of adjacent 4 sets of pixels in N sets of pixels according to an embodiment of the present application.

Fig. 10 is a schematic structural view of another fingerprint detection device according to an embodiment of the present application.

Fig. 11 is a schematic diagram of pixel positions of adjacent 4 groups of pixels among N groups of pixels according to an embodiment of the present application.

Fig. 12 is a schematic structural view of another fingerprint detection device according to an embodiment of the present application.

Fig. 13 is a schematic structural view of another fingerprint detection device 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 may be applied to optical fingerprint systems, including but not limited to optical fingerprint identification systems and products based on optical fingerprint imaging, and the embodiments of the present application are only described by way of example in terms of optical fingerprint systems, but should not be construed as limiting the embodiments of the present application in any way, and the embodiments of the present application are equally applicable to other systems employing optical imaging techniques, etc.

As a common application scenario, the optical fingerprint system provided by the embodiment of the application can be applied to smart phones, tablet computers and other mobile terminals or other electronic devices with display screens; more specifically, in the above electronic device, the fingerprint recognition device may be specifically an optical fingerprint device, which may be disposed in a partial area or an entire area Under the display screen, thereby forming an Under-screen (Under-display) optical fingerprint system. Alternatively, the fingerprint recognition device may be partially or fully integrated inside the display screen of the electronic apparatus, thereby forming an In-screen (In-display) optical fingerprint system.

Fig. 1 is a schematic structural diagram of an electronic device to which an embodiment of the present application may be applied, where the electronic device 10 includes a display screen 120 and an optical fingerprint device 130, and the optical fingerprint device 130 is disposed in a partial area under the display screen 120. The optical fingerprint device 130 includes an optical fingerprint sensor including a sensing array 133 having a plurality of optical sensing units 131, where the sensing array 133 is located or the sensing area thereof is the fingerprint detection area 103 of the optical fingerprint device 130. As shown in fig. 1, the fingerprint detection area 103 is located in the display area of the display screen 120. In an alternative embodiment, the optical fingerprint device 130 may also be disposed at other locations, such as the side of the display screen 120 or an edge non-transparent area of the electronic device 10, and the optical signals of at least a portion of the display area of the display screen 120 are directed to the optical fingerprint device 130 by an optical path design such that the fingerprint detection area 103 is actually located in the display area of the display screen 120.

It should be appreciated that the area of the fingerprint detection area 103 may be different from the area of the sensing array of the optical fingerprint device 130, for example, by an optical path design such as lens imaging, a reflective folded optical path design, or other optical path designs such as light converging or reflecting, the area of the fingerprint detection area 103 of the optical fingerprint device 130 may be made larger than the area of the sensing array of the optical fingerprint device 130. In other alternative implementations, the fingerprint detection area 103 of the optical fingerprint device 130 may also be designed to substantially coincide with the area of the sensing array of the optical fingerprint device 130 if light path guiding is performed, for example, by means of light collimation.

Therefore, when the user needs to unlock the electronic device or perform other fingerprint verification, the user only needs to press the finger against the fingerprint detection area 103 located on the display screen 120, so as to realize fingerprint input. Since fingerprint detection can be implemented in the screen, the electronic device 10 adopting the above structure does not need to have a special reserved space on the front surface to set fingerprint keys (such as Home keys), so that a comprehensive screen scheme can be adopted, that is, the display area of the display screen 120 can be basically expanded to the front surface of the whole electronic device 10.

As an alternative implementation manner, as shown in fig. 1, the optical fingerprint device 130 includes a light detecting portion 134 and an optical component 132, where the light detecting portion 134 includes the sensing array, and a reading circuit and other auxiliary circuits electrically connected to the sensing array, which may be fabricated on a chip (Die) such as an optical imaging chip or an optical fingerprint sensor by a semiconductor process, and the sensing array is specifically a Photo detector (Photo detector) array, which includes a plurality of Photo detectors distributed in an array, and the Photo detectors may be used as the optical sensing units as described above; the optical assembly 132 may be disposed over a sensing array of the light detecting portion 134, which may specifically include a Filter layer (Filter) that may be used to Filter out ambient light that penetrates the finger, a light guiding layer or light path guiding structure that is primarily used to guide reflected light reflected from the finger surface to the sensing array for optical detection, and other optical elements.

In particular implementations, the optical assembly 132 may be packaged in the same optical fingerprint component as the light detection portion 134. For example, the optical component 132 may be packaged in the same optical fingerprint chip as the optical detecting portion 134, or the optical component 132 may be disposed outside the chip where the optical detecting portion 134 is located, for example, the optical component 132 is attached above the chip, or part of the components of the optical component 132 are integrated in the chip.

The light guiding layer or the light path guiding structure of the optical component 132 may have various implementations, for example, the light guiding layer may be a Collimator (Collimator) layer made of a semiconductor silicon wafer, which has a plurality of collimating units or a micropore array, the collimating units may be small holes, the light vertically incident to the collimating units from the reflected light reflected by the finger may pass through and be received by the optical sensing units below the collimating units, and the light with an excessive incident angle is attenuated by multiple reflections inside the collimating units, so each optical sensing unit can only basically receive the reflected light reflected by the fingerprint lines above the optical sensing units, and the sensing array can detect the fingerprint image of the finger.

In another embodiment, the light guiding layer or light path guiding structure may also be an optical Lens (Lens) layer having one or more Lens units, such as a Lens group of one or more aspheric lenses, for converging the reflected light reflected from the finger to a sensing array of the light detecting part 134 thereunder so that the sensing array may image based on the reflected light, thereby obtaining a fingerprint image of the finger. Optionally, the optical lens layer may further form a pinhole in the optical path of the lens unit, and the pinhole may cooperate with the optical lens layer to expand the field of view of the optical fingerprint device to enhance the fingerprint imaging effect of the optical fingerprint device 130.

In other embodiments, the light guiding layer or the light path guiding structure may also specifically employ a Micro-Lens layer having a Micro-Lens array formed of a plurality of Micro-lenses, which may be formed over the sensing array of the light sensing part 134 by a semiconductor growth process or other processes, and each Micro-Lens may correspond to one of sensing cells of the sensing array, respectively. And, other optical film layers, such as a dielectric layer or a passivation layer, may be further formed between the microlens layer and the sensing unit, and more particularly, a light blocking layer having micro holes formed between the corresponding microlens and the sensing unit may be further included between the microlens layer and the sensing unit, and the light blocking layer may block optical interference between adjacent microlenses and the sensing unit, and allow light corresponding to the sensing unit to be converged into the inside of the micro holes by the microlenses and transmitted to the sensing unit through the micro holes for optical fingerprint imaging. It should be appreciated that several implementations of the above-described light path guiding structure may be used alone or in combination, for example, a microlens layer may be further provided under the collimator layer or the optical lens layer. Of course, when a collimator layer or an optical lens layer is used in combination with a microlens layer, the specific laminated structure or optical path thereof may need to be adjusted as actually needed.

As an alternative embodiment, the display screen 120 may employ a display screen having a self-luminous display unit, such as an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. Taking an OLED display as an example, the optical fingerprint device 130 may utilize a display unit (i.e., an OLED light source) of the OLED display 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection. When the finger 140 is pressed against the fingerprint detection area 103, the display 120 emits a light 111 to the target finger 140 above the fingerprint detection area 103, and the light 111 is reflected on the surface of the finger 140 to form reflected light or scattered light scattered inside the finger 140 to form scattered light, and in the related patent application, the reflected light and the scattered light are collectively referred to as reflected light for convenience of description. Since ridges (ribs) of the fingerprint and the ribs (valley) have different light reflection capacities, the reflected light 151 from the ridges of the fingerprint and the reflected light 152 from the ribs of the fingerprint have different light intensities, and the reflected light is received by the sensing array 134 in the optical fingerprint device 130 and converted into corresponding electrical signals, i.e., fingerprint detection signals after passing through the optical component 132; fingerprint image data can be obtained based on the fingerprint detection signal, and fingerprint matching verification can be further performed, thereby realizing an optical fingerprint recognition function in the electronic device 10.

In other embodiments, the optical fingerprint device 130 may also employ an internal light source or an external light source to provide an optical signal for fingerprint detection. In this case, the optical fingerprint device 130 may be adapted to a non-self-luminous display screen, such as a liquid crystal display screen or other passive light emitting display screen. Taking the application to a liquid crystal display having a backlight module and a liquid crystal panel as an example, to support the under-screen fingerprint detection of the liquid crystal display, the optical fingerprint system of the electronic device 10 may further include an excitation light source for optical fingerprint detection, which may be specifically an infrared light source or a light source of non-visible light with a specific wavelength, which may be disposed under the backlight module of the liquid crystal display or under an edge region of a protective cover plate of the electronic device 10, and the optical fingerprint device 130 may be disposed under the edge region of the liquid crystal panel or the protective cover plate and guided through an optical path so that fingerprint detection light may reach the optical fingerprint device 130; alternatively, the optical fingerprint device 130 may be disposed under the backlight module, and the backlight module may be provided with holes or other optical designs on a film layer such as a diffusion sheet, a brightness enhancement sheet, a reflective sheet, etc. to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint device 130. When the optical fingerprint device 130 employs an internal light source or an external light source to provide an optical signal for fingerprint detection, the detection principle is consistent with that described above.

It should be appreciated that in particular implementations, the electronic device 10 also includes a transparent protective cover plate, which may be a glass cover plate or a sapphire cover plate, that is positioned over the display screen 120 and covers the front of the electronic device 10. Because, in the embodiment of the present application, the so-called finger pressing on the display screen 120 actually means pressing on the cover plate above the display screen 120 or the surface of the protective layer covering the cover plate.

It should also be appreciated that the electronic device 10 may also include a circuit board 150 disposed below the optical fingerprint assembly 130. The optical fingerprint device 130 may be adhered to the circuit board 150 by a back adhesive, and electrically connected to the circuit board 150 by soldering with pads and wires. The optical fingerprint apparatus 130 may enable electrical interconnection and signal transmission with other peripheral circuits or other elements of the electronic device 10 through the circuit board 150. For example, the optical fingerprint device 130 may receive a control signal of the processing unit of the electronic apparatus 10 through the circuit board 150, and may also output a fingerprint detection signal from the optical fingerprint device 130 to the processing unit or the control unit of the electronic apparatus 10 or the like through the circuit board 150.

On the other hand, in some embodiments, the optical fingerprint device 130 may include only one optical fingerprint sensor, where the area of the fingerprint detection area 103 of the optical fingerprint device 130 is small and the position is fixed, so that the user needs to press the finger to a specific position of the fingerprint detection area 103 when inputting the fingerprint, otherwise, the optical fingerprint device 130 may not be able to collect the fingerprint image, resulting in poor user experience. In other alternative embodiments, the optical fingerprint device 130 may specifically include a plurality of optical fingerprint sensors; the plurality of optical fingerprint sensors may be disposed side by side below the display screen 120 in a spliced manner, and sensing areas of the plurality of optical fingerprint sensors together form the fingerprint detection area 103 of the optical fingerprint device 130. That is, the fingerprint detection area 103 of the optical fingerprint device 130 may include a plurality of sub-areas, each corresponding to a sensing area of one of the optical fingerprint sensors, so that the fingerprint acquisition area 103 of the optical fingerprint device 130 may be extended to a main area of the lower half of the display screen, that is, to a finger usual pressing area, thereby implementing a blind press type fingerprint input operation. Alternatively, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 103 may also be extended to half or even the whole display area, thereby achieving half-screen or full-screen fingerprint detection.

It should also be understood that in embodiments of the present application, the sensing array in the optical fingerprint device may also be referred to as a pixel array, and the optical sensing unit or sensing unit in the sensing array may also be referred to as a pixel unit or pixel.

It should be noted that, the optical fingerprint device in the embodiment of the present application may also be referred to as an optical fingerprint recognition module, a fingerprint detection device, a fingerprint recognition module, a fingerprint detection module, a fingerprint acquisition device, etc., where the above terms may be replaced with each other.

Fig. 2 shows a schematic block diagram of a fingerprint detection device 20.

As shown in fig. 2, the fingerprint detection device 20 comprises:

a pixel array 230 including a plurality of pixels;

at least one light blocking layer 220 formed over the pixel array 230, wherein the at least one light blocking layer 220 is provided with a plurality of light passing apertures forming a plurality of light guiding channels.

A microlens array 210 disposed over the at least one light blocking layer 220;

the microlens array 210 is configured to converge the light signal reflected by the finger to the plurality of light guide channels of the at least one light blocking layer 220, and the light signal is transmitted to the pixel array 230 through the plurality of light guide channels of the at least one light blocking layer 220.

Specifically, the microlens array 210 is a microlens array composed of a plurality of circular microlenses. Each circular microlens corresponds to one pixel in the pixel array 230 and one light guide channel of the plurality of light guide channels. The light signals reflected by the finger are converged by the circular micro lenses and then received by the pixels through the light guide channels, and the light signals received by the pixels are used for forming fingerprint images of the finger.

For example, as shown in fig. 2, the first microlens 211 is any one of the circular microlenses in the microlens array 210, the corresponding pixel is the first pixel 231, and the corresponding light guide channel is the first light guide channel 221. The light signal emitted by the display screen is reflected by the finger, converged by the first micro lens 211, and received by the first pixel 231 after passing through the first light guide channel 221, where the first pixel 231 can be used to form a pixel value of the finger fingerprint image.

Optionally, the light entrance surface of each circular microlens in the microlens array is spherical or aspherical.

Alternatively, the pixel array 230 may include the sensing array 134 of fig. 1, and the plurality of pixels may include the optical sensing unit of fig. 1. Each pixel in the pixel array 230 includes a sensing region and an associated circuit region, wherein the sensing region is configured to receive the optical signal and convert the optical signal into an electrical signal of the fingerprint image, and in particular, the optical signal converged by each circular microlens is received by the sensing region in its corresponding pixel and converted into an electrical signal. And the relevant circuit area is used for controlling and outputting the electric signal.

Alternatively, the fingerprint detection device 20 may detect light signals in the vertical direction as well as light signals in the oblique direction.

When detecting the optical signal in the vertical direction, as shown in fig. 2, the center of the first pixel 231, the centers of the plurality of light-passing apertures on the first light guide channel 221, and the optical center of the first microlens 211 coincide in the vertical direction.

When detecting the optical signal in the non-vertical direction, the center of the first pixel 231 and the centers of the plurality of light-passing holes on the first light guide channel 221 are inclined in the same direction as compared with the optical center of the first microlens 211.

Fig. 3 is a top view of the microlens array 210 and the pixel array 230 of fig. 2.

As shown in fig. 3, a plurality of circular microlenses in the microlens array 210 are arranged at an array interval. Ideally, two adjacent circular microlenses are tangential to each other in either the horizontal or vertical direction. However, due to the accuracy of the manufacturing process, there is a gap between two adjacent circular microlenses, also referred to as critical dimension (Critical Dimension, CD), which varies under different process conditions. The smaller the CD, the higher the process accuracy and the higher the cost.

In this case, the effective condensing area of the microlens array 210 is the sum of areas of a plurality of circular microlenses, which can increase the field of view and receive a wider range of optical signals than a planar area that is not condensed, thereby increasing the intensity of the received optical signals per unit area. However, the gaps between the plurality of circular microlenses in the microlens array 210 are not light condensing regions, and do not have light condensing effect, so that the intensity of the received optical signal in the unit area cannot be improved.

As shown in fig. 3, the pixel array 230 is uniformly divided into a plurality of pixels, which are square and arranged in an array. The sensing area in the pixel is shown as a shadow area in the figure, and a blank area except the shadow area in the pixel is a circuit area and is used for connecting a plurality of pixels in the pixel array and transmitting fingerprint electric signals output by the sensing area.

Specifically, a square pixel is arranged below each circular microlens, and the center of a sensing area in the pixel is coincident with the optical center of the corresponding circular microlens in the vertical direction. And the side length a of a square pixel is equal to the sum of the diameter of a circular microlens and the CD between two adjacent circular microlenses.

In the embodiment of the application, the ratio of the sum of the areas of the plurality of circular microlenses to the area of the microlens array, or the ratio of the sum of the areas of the plurality of circular microlenses to the area of the pixel array, is also written as the duty ratio of the microlenses, and can be used for representing the intensity of the light signal receiving capability of the microlens array, and the larger the duty ratio is, the more the area of the microlens array for converging the light signal is, and the light intensity is increased.

In the fingerprint detection device 20 shown in fig. 2 and 3, the duty ratio of the microlens array 210 is the ratio of the area of one circular microlens to the area of one pixel over the unit cycle area. The specific calculation formula is as follows:。

wherein D is the duty cycle of the microlens array, R is the radius of the circular microlenses, and a is the CD value between two adjacent circular microlenses.

Ideally, when a is 0, if R is 5.75 μm, the duty cycle d=pi×5.75 of the microlens array 210 in the fingerprint detection device 20 ² /(2×5.75) ² =π/4=78.54%。

When a is 1 μm and R is 5.75 μm, the duty ratio d=pi×5.75 of the microlens array 210 in the fingerprint detection device 20 ² /(2×5.75+1) ² =66.48%。

As is clear from the above description and calculation, the CD value between the adjacent circular microlenses is ideally 0, the duty ratio of the microlens array 230 in the fingerprint detection device 20 is 78.54%, whereas the CD value between the adjacent circular microlenses is not ideally greater than 0, the duty ratio of the microlens array 230 is less than 78.54% in the ideal case, the area of the microlenses for light collection is not large, and thus the received optical signal intensity is not large.

The application provides a fingerprint identification device, which is characterized in that on the basis of the existing process, the arrangement mode of a plurality of round micro lenses in a micro lens array is changed, the duty ratio of the micro lens array is increased, and the intensity of received optical signals is improved, so that the fingerprint image quality and the fingerprint identification performance are improved.

Hereinafter, referring to fig. 4 to 13, a fingerprint recognition device according to an embodiment of the present application will be described in detail.

In the embodiments shown below, the same reference numerals are used for the same structures for the sake of understanding, and detailed description of the same structures is omitted for the sake of brevity.

Fig. 4 is a schematic structural diagram of a fingerprint detection device 30 according to an embodiment of the present application, and fig. 5 and 6 are two top views of the fingerprint detection device 30 in fig. 4, where the fingerprint detection device 30 is configured to be disposed below a display screen of an electronic device to implement fingerprint recognition.

As shown in fig. 4 to 6, the fingerprint detection device 30 comprises:

a microlens array 310 including a plurality of circular microlenses, each circular microlens of the plurality of circular microlenses being adjacent to six circular microlenses, a line connecting centers of the six circular microlenses constituting a regular hexagon;

The pixel array 330 is disposed below the microlens array, and includes a plurality of pixels, where the pixels are in one-to-one correspondence with the plurality of circular microlenses, and the pixels are configured to receive optical signals converged by the corresponding circular microlenses, where the optical signals are optical signals reflected or scattered by a finger, and are configured to detect fingerprint information of the finger;

In an embodiment of the present application, the microlens array 310 may be the same as the microlens array 210 of fig. 2 or 3, and is used to collect the light signal reflected or scattered by the finger and transmit the light signal to the pixel array, where the light signal is used to detect the fingerprint information of the finger. The light inlet surfaces of the plurality of round microlenses are spherical or aspherical. The microlens array is made of a transparent medium, and the light transmittance of the transparent medium is more than 99%, such as resin.

Alternatively, the plurality of pixels may be a plurality of rectangular pixels.

Alternatively, the plurality of circular microlenses may be arranged in a plurality of rows or in a plurality of columns. When the plurality of circular microlenses are arranged in a plurality of rows, the plurality of circular microlenses of each row are on the same horizontal line. When the plurality of circular microlenses are arranged in a plurality of columns, the plurality of circular microlenses of each column are on the same vertical line.

Specifically, fig. 5 is a top view of the fingerprint detection device 30 when a plurality of circular microlenses are arranged in a plurality of rows. Fig. 6 is a top view of the fingerprint detection device 30 when a plurality of circular microlenses are arranged in a plurality of rows.

In the embodiment of the present application, the plurality of circular microlenses in the microlens array 310 are arranged in a close-packed hexagonal manner, that is, as shown in fig. 5 and 6, each circular microlens in the plurality of circular microlenses is adjacent to six circular microlenses, and the connecting lines of the centers of the six circular microlenses form a regular hexagon.

Optionally, the distances between any two adjacent circular microlenses in the plurality of circular microlenses are equal.

In one possible embodiment, any two adjacent circular microlenses of the plurality of circular microlenses are tangential, the distance between two adjacent circular microlenses being 0. The circular microlenses are staggered.

In another possible embodiment, a certain gap distance exists between any two adjacent circular microlenses among the plurality of circular microlenses, and the gap is determined by a critical dimension CD in the manufacturing process. At this time, the plurality of circular microlenses are alternately arranged.

As shown in fig. 5 and 6, a certain CD gap exists between any two adjacent circular microlenses in the plurality of circular microlenses, and the CD gap between any two adjacent circular microlenses in the plurality of circular microlenses is equal.

In an embodiment of the present application, the pixel array 330 may include the sensor array 134 of fig. 1, and the plurality of rectangular pixels may include the optical sensor unit of fig. 1. Similar to the pixel array 230 in fig. 2, each pixel in the pixel array 330 also includes a sensing region and a related circuit region, and the related description of the sensing region and the related circuit region can refer to the related description in fig. 2, which is not repeated here.

Specifically, the pixel array 330 is divided into a plurality of rectangular pixels, the rectangular pixels are in one-to-one correspondence with the circular microlenses, the sensing area in the rectangular pixels is used for receiving the light signals converged by the corresponding circular microlenses, converting the light signals into the pixel values of the electrical signals of the fingerprint image of the finger, and transmitting the pixel values of the electrical signals to the processing unit for processing through the circuit structure in the relevant circuit area.

Alternatively, a plurality of rectangular pixels in the pixel array 330 are staggered with respect to each other.

Alternatively, as shown in fig. 5, when the plurality of circular microlenses are arranged in a plurality of rows, the side length of the rectangular pixel corresponding to each circular microlens in the horizontal direction is equal to the sum of the diameter of the circular microlens and the gap between the two circular microlenses, and the side length in the vertical direction is smaller than the diameter of the circular microlens.

Alternatively, as shown in fig. 6, when a plurality of circular microlenses are arranged in a plurality of rows, the side length of each rectangular pixel corresponding to each circular microlens in the vertical direction is equal to the sum of the diameter of the circular microlens and the gap between the two circular microlenses, and the side length in the horizontal direction is smaller than the diameter of the circular microlens.

Next, taking fig. 5 as an example, the duty ratio of the microlens array 310 in the fingerprint detection device 30 and the size of the pixels in the pixel array 330 are described.

The duty ratio of the microlens array 330 at this time is calculated with the diamond-shaped region as a periodic region in the figure. In the period region of the diamond, the vertex of the diamond is located at the center of four circular microlenses, and the diamond region includes one complete circular microlens, in which case, the duty ratio D of the microlens array 310 is calculated as follows:

，

wherein R is the radius of the circular microlenses, and a is the CD value between two adjacent circular microlenses.

Ideally, when a is 0, if R is 5.75 μm, the duty cycle of the microlens array 310 in the fingerprint detection device 30 is:

。

when a is 1 μm and R is 5.75 μm, the duty ratio of the microlens array 310 in the fingerprint detection device 30 is:

。

as can be seen from calculation, in this case, the duty ratio of the microlens array 310 is larger than that of the microlens array 210 in fig. 3, and by adjusting the positional relationship of the plurality of circular microlenses, the area duty ratio of the plurality of circular microlenses in the microlens array can be increased, and the intensity of the optical signal received by the microlens array can be increased, thereby improving the quality of the fingerprint image and the fingerprint recognition performance.

Note that, in the arrangement of the plurality of circular microlenses in the microlens array 310, the area and period of the corresponding pixel array 330 are different from those of the pixel array 230 in fig. 2, and each pixel in the pixel array 230 is square, and the center points of the plurality of pixels are square. In the pixel array 330, each pixel has a rectangular shape, the area of each pixel is smaller than the area of the pixel in the pixel array 220, and the center points of the pixels are arranged in a diamond shape.

By adaptively adjusting the arrangement mode and the area of a plurality of pixels in the pixel array according to the arrangement mode of a plurality of circular microlenses in the microlens array, the space utilization rate of the pixel array can be improved, and the resolution of the pixel array and the fingerprint image can be improved.

Specifically, in the embodiment of the present application, the plurality of rectangular pixels in the pixel array 330 are N groups of pixels, each group of pixels includes M adjacent pixels, and one pixel belongs to only one pixel group, wherein M, N is a positive integer greater than 1.

Alternatively, in one possible implementation, two pixels are included in each of the N groups of pixels, m=2, and each group of pixels may include two pixels adjacent to each other up and down when the microlens array 310 and the pixel array 330 are arranged in the manner shown in fig. 5. The relative positional relationship of two pixels in each group of pixels is the same.

As shown in fig. 7, adjacent 4 of the N groups of pixels are shown as distinct shaded areas in the figure, one form of shaded area identifying a group of pixels. The centers of the first group of pixels are shown as a middle point A in the figure, the centers of the second group of pixels are shown as a middle point B in the figure, the centers of the third group of pixels are shown as a middle point C in the figure, and the centers of the fourth group of pixels are shown as a middle point D in the figure. The centers of the 4 groups of pixels are arranged according to a rectangular period, the arrangement period in the horizontal direction is the same as the period of the pixels in the horizontal direction, and the arrangement period in the vertical direction is 2 times the period of the pixels in the vertical direction.

Alternatively, in another possible implementation, three pixels are included in each group of pixels, m=3, and when the pixel array 330 is arranged in the manner shown in fig. 5, each group of pixels may include three pixels that are adjacent to each other up and down. The relative positional relationship between three pixels in each group of pixels is either a first relative positional relationship or a second relative positional relationship.

Alternatively, the relative positional relationship of three pixels in adjacent two groups of pixels in the horizontal direction or the vertical direction is the same.

As shown in fig. 8, adjacent 4 groups of pixels in the N groups of pixels are shown in different shaded areas in the figure, wherein the center of the first group of pixels is shown as a point a in the figure, and the relative position relationship of three pixels is a first position relationship, namely, the connection line of the centers of the upper one pixel, the lower two pixels and the three pixels forms a positive regular triangle. The center of the second group of pixels is shown as a point B in the figure, wherein the relative position relationship of the three pixels is the same as that of the first group of pixels, and is the first position relationship. The center of the third group of pixels is shown as a point C in the figure, wherein the relative position relationship of the three pixels is a second position relationship, namely, the upper two pixels, the lower one and the connecting line of the centers of the three pixels form an inverted regular triangle. The center of the fourth group of pixels is shown as a point D in the figure, wherein the relative position relationship of the three pixels is the same as the relative position relationship of the third group of pixels, and is the second position relationship.

The 4 groups of pixels are arranged in a rectangular period, the arrangement period in the horizontal direction is 1.5 times the period of the pixels in the horizontal direction, and the arrangement period in the vertical direction is 2 times the period of the pixels in the vertical direction.

Alternatively, in a third possible implementation, four pixels are included in each group of pixels, where m=4, and when the pixel array 330 is arranged in the manner shown in fig. 5, each group of pixels may include four pixels that are adjacent to each other up and down. The relative position relation of four pixels in each group of pixels is the same, and the connecting lines of the centers of the four pixels in each group of pixels form a diamond.

As shown in fig. 9, adjacent 4 groups of pixels in the N groups of pixels are shown in different shaded areas in the figure, wherein the center of the first pixel group is shown as a point a in the figure, the center of the second pixel group is shown as a point B in the figure, the center of the third pixel group is shown as a point C in the figure, and the center of the fourth pixel group is shown as a point D in the figure. The 4 groups of pixels are arranged in a rectangular period, the arrangement period in the horizontal direction is 2 times the period of the pixels in the horizontal direction, and the arrangement period in the vertical direction is 2 times the period of the pixels in the vertical direction.

It should be understood that each group of pixels may include any other number of pixels, and the plurality of groups of pixels may be arranged according to a rectangular or square period, which is not limited in the embodiment of the present application.

It should also be appreciated that the first to fourth sets of pixels described above are any 4 sets of adjacent pixels of the N sets of pixels. The other groups of pixels in the N groups of pixels may have the same arrangement manner and arrangement period as those of the first group of pixels to the fourth group of pixels.

It should be further understood that when the pixel array 330 is arranged in the manner shown in fig. 6, the center points of the N groups of pixels and the pixel area distribution can refer to fig. 7 to 9 and the related description, and are not repeated here.

Optionally, n×m (N multiplied by M) pixels of the N groups of pixels are configured to receive light signals in the same direction to form a fingerprint image, and a sum of the light signals received by the M pixels is configured to form a pixel value in the fingerprint image. In other words, each pixel in the pixel array 330 is configured to receive the light signal in the same direction, and the light signal received by the pixel array 330 is configured to form a fingerprint image.

Optionally, n×m pixels in the N groups of pixels are each configured to receive a light signal in a vertical direction or a light signal in a same oblique direction.

Specifically, M pixels of each of the N groups of pixels receive optical signals in a vertical direction or in the same oblique direction, and convert the optical signals into M electrical signals, where the sum of the M electrical signals is one pixel value in the fingerprint image.

In the embodiment of the application, when a plurality of pixels are used for forming one pixel value in a fingerprint image, any one pixel in the plurality of pixels is damaged, and other pixels can work and still form the pixel value, so that the reliability and the production yield of the fingerprint detection device can be improved.

Optionally, as shown in fig. 10, the fingerprint detection device 30 further includes a processing unit 340, configured to sum the electrical signals obtained by converting M pixels of each of the N groups of pixels to form a pixel value in the fingerprint image.

Alternatively, the processing unit 340 may be a processor, which may be a processor in the fingerprint detection device 30, and the pixel array 330 and the processing unit 340 are both located in the fingerprint detection device. The processor may also be a processor in an electronic device where the fingerprint detection device 30 is located, for example, a micro control unit (Microcontroller Unit, MCU) in a mobile phone, which is not limited in the embodiment of the present application.

When the number of pixels of the pixel array 330 in the horizontal direction and the vertical direction is equal, if each group of pixels includes two pixels, m=2, the electric signals of each group of two pixels are summed and output as one pixel value in the fingerprint image, and the aspect ratio of the formed fingerprint image is 2:1.

If each group of pixels comprises three pixels, and m=3, the electric signals of each group of three pixels are summed and output to be used as one pixel value of the fingerprint image, and the aspect ratio of the formed fingerprint image is 4:3.

If each group of pixels comprises four pixels, and when m=4, the electric signals of each group of four pixels are summed and output to be used as one pixel value of the fingerprint image, and the aspect ratio of the formed fingerprint image is 1:1.

Optionally, the processing unit 340 interpolates the fingerprint image formed by the plurality of sets of pixels to obtain an optimized fingerprint image.

Optionally, the optimized fingerprint image is an enlarged fingerprint image.

Optionally, according to the size of the fingerprint image, different interpolation modes are adjusted to obtain a square optimized fingerprint image, and the aspect ratio of the optimized fingerprint image is 1:1.

For example, when the aspect ratio of the fingerprint image is 2:1, interpolation processing is performed on pixels in the fingerprint image in the short side direction of the fingerprint image, for example, an average value of two pixel values is inserted between two adjacent pixel values as interpolation pixels, and an optimized fingerprint image after interpolation amplification is obtained, wherein the optimized fingerprint image is a square fingerprint image.

Optionally, when M is an even number, n×m pixels in the N groups of pixels are configured to receive optical signals in M different directions to form M fingerprint images, and N pixels in the N groups of pixels are configured to receive optical signals in one direction to form one fingerprint image in the M fingerprint images, where the N pixels respectively belong to the N groups of pixels.

Since M is an even number, the relative positional relationship of M pixels in each of the N groups of pixels is the same, and the pixels in the same relative position in each of the N groups of pixels receive optical signals in the same direction, and the M pixels in each group of pixels receive optical signals in M different directions.

In the following, as illustrated in fig. 11, adjacent 4 groups of pixels in the N groups of pixels are illustrated as different shaded areas, wherein the first pixel group 331 includes first to fourth pixels 3311 to 3314, the second pixel group 332 includes fifth to eighth pixels 3321 to 3324, the third pixel group 333 includes ninth to twelfth pixels 3331 to 3334, and the fourth pixel group 334 includes thirteenth to sixteenth pixels 3341 to 3344.

The pixels located at the upper left corner of each of the four pixel groups are the first pixel 3311, the fifth pixel 3321, the ninth pixel 3331 and the thirteenth pixel 3341, respectively, which receive the light signals in the first direction, and the pixels located at the upper right corner of each of the four pixel groups are the second pixel 3312, the sixth pixel 3322, the tenth pixel 3332 and the fourteenth pixel 3342, respectively, which receive the light signals in the second direction, and the third pixel 3313, the seventh pixel 3323, the eleventh pixel 3333 and the fifteenth pixel 3343 are located at the lower left corner of each of the pixel groups, and the fourth pixel 3314, the eighth pixel 3324, the twelfth pixel 3334 and the sixteenth pixel 3344 are located at the lower right corner of each of the pixel groups, respectively, which receive the light signals in the fourth direction.

In the N groups of pixels, the other groups of pixels may refer to the case where the 4 groups of pixels receive the light direction, the pixel located at the upper left corner of each group of pixels receives the light signal in the first direction, the pixel located at the upper right corner receives the light signal in the second direction, the pixel located at the lower left corner receives the light signal in the third direction, and the pixel located at the lower right corner receives the light signal in the fourth direction.

N pixels of the N groups of pixels which receive light signals in the same direction are used for forming a fingerprint image. Thus, a total of 4 fingerprint images may be formed by the N groups of pixels, e.g., pixels receiving light signals in a first direction are used to form a first fingerprint image, pixels receiving light signals in a second direction are used to form a second fingerprint image, pixels receiving light signals in a third direction are used to form a third fingerprint image, and pixels receiving light signals in a fourth direction are used to form a fourth fingerprint image.

Alternatively, in one possible implementation, one pixel is used to form one pixel value in one fingerprint image. For example, the light signals received by the first pixel 3311, the fifth pixel 3321, the ninth pixel 3331, and the thirteenth pixel 3341 are each used to form one pixel value in the first fingerprint image; the light signals received by the second pixel 3312, the sixth pixel 3322, the tenth pixel 3332, and the fourteenth pixel 3342 are each used to form one pixel value in the second fingerprint image; the light signals received by the third pixel 3313, the seventh pixel 3323, the eleventh pixel 3333, and the fifteenth pixel 3343 are each used to form one pixel value in the third fingerprint image; the light signals received by the fourth pixel 3314, eighth pixel 3324, twelfth pixel 3334, and sixteenth pixel 3344 are each used to form one pixel value in the fourth fingerprint image.

Alternatively, in another possible embodiment, a plurality of pixels are used to form a pixel value in a fingerprint image. Specifically, the plurality of pixels receive light signals in the same direction, and the plurality of pixels are pixels in X groups of pixels respectively, wherein X is more than 1 and less than N, and X is a positive integer.

For example, x=4, and the sum of the light signals received by the first pixel 3311, the fifth pixel 3321, the ninth pixel 3331, and the thirteenth pixel 3341 is used to form one pixel value in the first fingerprint image; the sum of the light signals received by the second pixel 3312, the sixth pixel 3322, the tenth pixel 3332, and the fourteenth pixel 3342 is used to form one pixel value in the second fingerprint image; the sum of the light signals received by the third pixel 3313, the seventh pixel 3323, the eleventh pixel 3333, and the fifteenth pixel 3343 is used to form one pixel value in the third fingerprint image; the sum of the light signals received by the fourth pixel 3314, eighth pixel 3324, twelfth pixel 3334, and sixteenth pixel 3344 is used to form one pixel value in the fourth fingerprint image.

It should be understood that, in addition to the above-mentioned 4 pixels receiving the same direction light signal being used to form a pixel value in a fingerprint image, other numbers of pixels receiving the same direction light signal may be used to form a pixel value in a fingerprint image, which is not limited in the embodiment of the present application.

In the embodiment of the application, a plurality of corresponding fingerprint images can be obtained by collecting a plurality of light signals in different directions reflected or scattered by fingers through N groups of pixels, so that the requirements of different scenes are met. In addition, a plurality of fingerprint images can be fused and optimized to obtain a new optimized fingerprint image, and the fingerprint image quality and the performance of the fingerprint detection device can be improved.

Particularly, when the N groups of pixels can respectively receive oblique light signals in different directions, the light inlet quantity received by the fingerprint identification device can be improved, and therefore the exposure time of the pixel array can be reduced. In addition, the oblique light signals can be received through N groups of pixels, and fingerprint information of the dry finger can be detected by utilizing the oblique light signals. In addition, the angle of view and the field of view of N groups of pixels in the fingerprint detection device can be enlarged.

Fig. 12 shows a schematic structural diagram of another fingerprint detection device 30. As shown in fig. 12, the fingerprint detection device 30 further comprises an optical component 320.

Optionally, the optical component 320 includes at least one light blocking layer disposed above the pixel array 330 and below the microlens array 310, wherein the at least one light blocking layer is formed with a plurality of light guiding channels;

The microlens array 310 is used to converge light signals into a plurality of light guide channels of at least one light blocking layer 320, and the light signals are transmitted into the pixel array 330 through a plurality of light passing channels of the at least one light blocking layer.

Specifically, each of the plurality of light guide channels corresponds to one rectangular pixel in the pixel array 330 and one circular microlens in the microlens array 310. That is, one circular microlens transmits a converging light signal to a corresponding light guide channel through which the light signal is received by a corresponding pixel.

Alternatively, as shown in fig. 12, the directions of the plurality of light guide channels are the same for passing the light signals in the same direction. At this time, each pixel in the pixel array 330 receives the light signal in the same direction. For example, a light signal in a vertical direction or a light signal at the same inclination angle is received.

Alternatively, the directions of the plurality of light guide channels may be different. For example, the plurality of light guide channels is N groups of light guide channels, each group of light guide channels includes M light guide channels, where the M light guide channels are used for passing through M light signals in different directions.

Specifically, one of the N sets of light guide channels corresponds to one of the N sets of pixels. The M light guide channels in each group of light guide channels respectively correspond to the M pixels in a group of pixels.

For example, as shown in fig. 13, two adjacent light guide channels are two light guide channels in a group of light guide channels, respectively, for passing light signals in two different directions, respectively.

Optionally, the optical component 320 further includes a filtering layer disposed in the optical path between the microlens and the photosensor, for filtering out the optical signal of the non-target wavelength band and transmitting the optical signal of the target wavelength band.

Alternatively, the filter layer may be disposed in the optical path between the microlens array 310 to the pixel array 330.

In one possible implementation, the filter layer may be integrated with the pixel array 330 in the fingerprint detection device 30, and in particular, the filter layer may be formed by performing a plating process on the pixel array 330, for example, by preparing a filter film above the pixel array by atomic layer deposition, sputtering, electron beam evaporation, ion beam plating, or the like. In the technical scheme, the thickness of the filter layer is less than or equal to 20 mu m.

Optionally, the filter layer is a light wavelength cut-off filter, and is used for filtering out light signals of a specific wave band, so that the influence of the ambient light signals of the specific wave band is reduced, and the fingerprint identification performance can be improved.

Optionally, the filter layer is used for passing an optical signal in a wave band range of 350-700 nm.

Optionally, the filter layer may also be used for passing an optical signal in a wavelength range of 800-1000 nm.

Optionally, the filter layer may also be used to pass optical signals in a wavelength band range of 350-700 nm and a wavelength band range of 800-1000 nm simultaneously.

The embodiment of the application also provides electronic equipment which can comprise a display screen and the fingerprint detection device in any of the above embodiments, wherein the fingerprint detection device is arranged below the display screen.

The electronic device may be any electronic device having a display screen.

It should be understood that the specific examples of the embodiments of the present application are intended to facilitate a better understanding of the embodiments of the present application by those skilled in the art, and are not intended to limit the scope of the embodiments of the present application.

It is to be understood that the terminology used in the embodiments of the application and in the appended claims is for the purpose of describing particular embodiments only, and is not intended to be limiting of the embodiments of the application. For example, as used in the embodiments of the application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

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

In the several embodiments provided in the present application, it should be understood that the disclosed system and apparatus may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices, or elements, or may be an electrical, mechanical, or other form of connection.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment of the present application.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application is essentially or a part contributing to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

While the application has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims

1. A fingerprint detection device for placement under a display screen of an electronic device, comprising:

the micro-lens array comprises a plurality of circular micro-lenses, each circular micro-lens in the plurality of circular micro-lenses is adjacent to six circular micro-lenses, the connecting lines of the centers of the six circular micro-lenses form a regular hexagon, and the plurality of circular micro-lenses are arranged in a plurality of rows or a plurality of columns;

the pixel array is arranged below the micro lens array and comprises a plurality of pixels, the pixels are in one-to-one correspondence with the circular micro lenses, the pixels are used for receiving light signals converged by the corresponding circular micro lenses, and the light signals are light signals reflected or scattered by fingers and are used for detecting fingerprint information of the fingers;

The plurality of pixels are N groups of pixels, each group of pixels in the N groups of pixels comprises M adjacent pixels, and the optical signals received by the M pixels are used for forming one pixel value in the fingerprint image of the finger, wherein M, N is a positive integer greater than 1.

2. The fingerprint detection device according to claim 1 wherein said plurality of pixels is a plurality of rectangular pixels.

3. The fingerprint detection device according to claim 1 wherein when M is an even number, the relative positional relationship of M pixels in each of said N groups of pixels is the same.

4. A fingerprint sensing device according to claim 3 wherein the line connecting the centers of the 4 pixels forms a diamond when M = 4.

5. The fingerprint detection device according to claim 1 wherein when M is an odd number, the relative positional relationship of M pixels in two adjacent groups of pixels in the same row in the N groups of pixels is different; or alternatively, the process may be performed,

the relative positional relationship of M pixels in two adjacent groups of pixels located in the same column in the N groups of pixels is different.

6. The fingerprint detection device according to claim 5 wherein the line connecting the centers of 3 pixels forms a regular triangle when M = 3.

7. The fingerprint detection device according to claim 1 wherein N x M pixels of said N groups of pixels are arranged to receive light signals in the same direction to form a fingerprint image, and the sum of the light signals received by said M pixels is arranged to form a pixel value in said fingerprint image.

8. The fingerprint detection device according to claim 1 wherein N x M pixels of said N groups of pixels are configured to receive M light signals in different directions to form M fingerprint images, and N pixels of said N groups of pixels are configured to receive light signals in one direction to form one fingerprint image of said M fingerprint images, wherein said N pixels belong to N groups of pixels, respectively.

9. The fingerprint sensing device according to claim 8, wherein the light signal received by one of said M pixels is used to form a pixel value in a fingerprint image.

10. The fingerprint detection device according to claim 8 wherein said M pixels comprise first pixels for receiving light signals in a first direction, and wherein the sum of the light signals received by X first pixels of said X groups of pixels of said N groups of pixels is used to form a pixel value in a fingerprint image, wherein 1 < X < N, and X is a positive integer.

11. The fingerprint detection device according to claim 1 wherein the distances between any two adjacent circular microlenses in said plurality of circular microlenses are equal.

12. The fingerprint detection device according to claim 1 wherein a distance between any two adjacent circular microlenses of the plurality of circular microlenses is 0 or more.

13. The fingerprint sensing device according to claim 1, wherein said plurality of pixels are staggered with respect to each other.

14. The fingerprint detection device according to claim 1 wherein said pixels have a width less than a diameter of said circular microlenses.

15. The fingerprint detection device according to claim 1, wherein the fingerprint detection device further comprises: a processing unit;

16. The fingerprint detection device according to claim 15, wherein said processing unit is configured to:

17. The fingerprint detection device according to any one of claims 1-16, wherein the fingerprint detection device further comprises: at least one light blocking layer;

the at least one light blocking layer is arranged between the micro lens array and the pixel array to form a plurality of light guide channels;

18. The fingerprint sensing device according to claim 17, wherein said plurality of light guide channels are adapted to pass light signals in the same direction, or,

the plurality of light guide channels are N groups of light guide channels, each group of light guide channels in the N groups of light guide channels comprises M light guide channels, and the M light guide channels are used for passing through optical signals in M different directions.

19. An electronic device, comprising: a display screen and a display device, wherein the display screen is provided with a display screen,

the fingerprint detection device of any one of claims 1-18, wherein the fingerprint detection device is arranged below the display screen.