CN111108511A

CN111108511A - Fingerprint detection device and electronic equipment

Info

Publication number: CN111108511A
Application number: CN201980004247.1A
Authority: CN
Inventors: 蒋鹏; 马明; 凌伟
Original assignee: Shenzhen Goodix Technology Co Ltd
Current assignee: Shenzhen Goodix Technology Co Ltd
Priority date: 2019-07-12
Filing date: 2019-10-14
Publication date: 2020-05-05
Anticipated expiration: 2039-10-14
Also published as: CN111108511B

Abstract

The embodiment of the application relates to fingerprint detection device and electronic equipment, and this fingerprint detection device is applicable to the below including the display screen of fingerprint detection area, and this fingerprint detection device includes: the fingerprint detection device comprises a plurality of fingerprint detection units, a plurality of fingerprint detection units and a control unit, wherein the size of each fingerprint detection unit and the distance between adjacent fingerprint detection units are determined according to related size parameters of each fingerprint detection unit or a fingerprint detection area; each fingerprint detection unit comprises from top to bottom: a microlens array; at least one light blocking layer to form a plurality of inclined light guide channels corresponding to each microlens; and each optical sensing pixel is respectively used for receiving the optical signals which are converged by the micro lens and transmitted through the corresponding light guide channel so as to detect the fingerprint information of the finger. The fingerprint detection device and the electronic equipment can realize the same effective fingerprint identification view field by using a smaller chip area, and the cost is reduced.

Description

Fingerprint detection device and electronic equipment

The present application claims the priority of the PCT patent applications with the application numbers PCT/CN2019/095880, PCT patent application names "fingerprint detection device and electronic device" filed on 12/7/2019, the priority of the PCT patent applications with the application numbers PCT/CN2019/099135, PCT patent application names "fingerprint detection device and electronic device" filed on 2/8/2019, and the priority of the PCT patent applications with the application numbers PCT/CN2019/102366, PCT patent application names "fingerprint detection device, method and electronic device" filed on 23/8/2019, the entire contents of which are incorporated herein by reference.

Technical Field

The present application relates to the field of biometric identification, and more particularly, to a fingerprint detection device and an electronic apparatus.

Background

Along with the high-speed development of the mobile phone industry, the biometric identification technology is more and more emphasized by people, and the convenient and low-cost under-screen fingerprint identification technology is practical and becomes needed by the public. Optical fingerprint identification technique under the screen sets up the optical fingerprint module in the display screen under, through gathering optical fingerprint image, realizes fingerprint identification. With the development of end products, the requirements on fingerprint identification performance, size and cost are higher and higher.

For example, in some scenarios, the problem of dry fingers occurs, the contact area between the dry fingers and the display screen is very small, the recognition response area is very small, the acquired fingerprints are discontinuous, the feature points are easy to lose, and the performance of fingerprint recognition is affected. In addition, while the problem of how to improve the performance of fingerprint identification is solved, the problems of cost, size and the like when the fingerprint identification device is applied to a special scene under a screen need to be considered.

Disclosure of Invention

The application provides a fingerprint detection device and electronic equipment, can realize the same fingerprint effective identification visual field with littleer chip area to reduce chip area and reduce the cost.

In a first aspect, a fingerprint detection device is provided, where the fingerprint detection device is suitable for a lower side of a display screen to perform optical fingerprint detection under the display screen, the display screen includes a fingerprint detection area, the fingerprint detection area is used for finger touch to perform fingerprint detection, and the fingerprint detection device includes: a plurality of fingerprint detection units, the size of each fingerprint detection unit in the plurality of fingerprint detection units and the distance between two adjacent fingerprint detection units are set according to size parameters, and the size parameters comprise at least one of the following parameters: the fingerprint detection device comprises a display screen, a field range of each fingerprint detection unit, an area of a fingerprint detection area, a thickness of the display screen and a distance from the surface of an optical path of each fingerprint detection unit to the lower surface of the display screen.

Wherein each fingerprint detection unit includes: the micro-lens array is arranged below the display screen and comprises a plurality of micro-lenses; at least one light blocking layer, which is arranged below the microlens array and is formed with a plurality of light guide channels corresponding to each microlens in the plurality of microlenses, wherein an included angle between each light guide channel in the plurality of light guide channels corresponding to each microlens and an optical axis of each microlens is less than 90 degrees; the optical sensing pixel array is arranged below the at least one light blocking layer and comprises a plurality of optical sensing pixels, one optical sensing pixel is arranged below each light guide channel in the plurality of light guide channels corresponding to each micro lens, the optical sensing pixel is used for receiving optical signals which are converged by the micro lens and transmitted through the corresponding light guide channel, and the optical signals are used for detecting fingerprint information of a finger.

Therefore, the fingerprint detection device including a plurality of fingerprint detection units according to the embodiment of the present application can solve the following problems: 1. the problem that the recognition effect of the vertical optical signal on the dry finger is too poor; 2. the problem of too long exposure time of the single-object telecentric micro-lens array scheme is solved; 3. the problem of excessive thickness of the fingerprint detection device; 4. the tolerance of the fingerprint detection device is too poor; 5. the problem of oversize of the fingerprint detection device; 6. the cost of the fingerprint detection device is too high.

With reference to the first aspect, in an implementation manner of the first aspect, the fingerprint detection units are the same size.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the separation distances of a plurality of fingerprint detection units located in a same row in the plurality of fingerprint detection units are equal; and/or the spacing distances of a plurality of fingerprint detection units positioned in the same column in the plurality of fingerprint detection units are equal.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the number of the fingerprint detection units is two.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, two fingerprint detection units are arranged side by side in the left-right direction.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the size parameter includes: under the condition that the field range of the upper surface of the display screen of each fingerprint detection unit is at least a first value X expanded outside the edge of each fingerprint detection unit, the length of the fingerprint detection area is greater than or equal to a second value Y, and the width of the fingerprint detection area is greater than or equal to a third value Z, the length of each fingerprint detection unit is greater than or equal to Y-2X, the width of each fingerprint detection unit is greater than or equal to 0.5Z-2X, and the horizontal distance between the two fingerprint detection units is less than or equal to 2X.

For example, among the dimensional parameters are: under the condition that the field range of the upper surface of the display screen of each fingerprint detection unit is at least 0.3mm of outward expansion of the edge of each fingerprint detection unit and the area of the fingerprint detection area is greater than or equal to 6mm, the length of each fingerprint detection unit is greater than or equal to 5.4mm, the width of each fingerprint detection unit is greater than or equal to 2.4mm, and the horizontal distance between the two fingerprint detection units is less than or equal to 0.6 mm.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the length of each fingerprint detection unit is 6mm, the width of each fingerprint detection unit is 2.3mm, and the horizontal distance between the two fingerprint detection units is 1 mm.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the length of each fingerprint detection unit is 6.5mm, the width of each fingerprint detection unit is 2.6mm, and the horizontal distance between the two fingerprint detection units is 1 mm.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the number of the fingerprint detection units is four.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the four fingerprint detection units are arranged in a 2 × 2 matrix.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the size parameter includes: under the condition that the field range of the upper surface of the display screen of each fingerprint detection unit is at least a first value X expanded outside the edge of each fingerprint detection unit, the length of each fingerprint detection area is greater than or equal to a second value Y, and the width of each fingerprint detection area is greater than or equal to a third value Z, the length of each fingerprint detection unit is greater than or equal to 0.5Y-2X, the width of each fingerprint detection unit is greater than or equal to 0.5Z-2X, the horizontal distance between two adjacent fingerprint detection units in the horizontal direction is less than or equal to 2X, and the vertical distance between two adjacent fingerprint detection units in the vertical direction is less than or equal to 2X.

For example, among the dimensional parameters are: the visual field range of each fingerprint detection unit on the upper surface of the display screen is that the edge of each fingerprint detection unit is expanded by at least 0.3mm, and the area of the fingerprint detection area is greater than or equal to 6mm, the length of each fingerprint detection unit is greater than or equal to 2.4mm, the width of each fingerprint detection unit is greater than or equal to 2.4mm, the horizontal distance between two adjacent fingerprint detection units in the horizontal direction is less than or equal to 0.6mm, and the vertical distance between two adjacent fingerprint detection units in the vertical direction is less than or equal to 0.6 mm.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the length of each fingerprint detection unit is 2.3mm, the width of each fingerprint detection unit is 2.3mm, a horizontal distance between two fingerprint detection units that are adjacent in a horizontal direction is 1.2mm, and a vertical distance between two fingerprint detection units that are adjacent in a vertical direction is 1.2 mm.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the length of each fingerprint detection unit is 2.6mm, the width of each fingerprint detection unit is 2.6mm, a horizontal distance between two fingerprint detection units adjacent in a horizontal direction is 1mm, and a vertical distance between two fingerprint detection units adjacent in a vertical direction is 1 mm.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, bottom portions of the light guide channels corresponding to each microlens respectively extend to below the adjacent microlenses.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the bottoms of the light guide channels corresponding to each microlens are located below the same microlens.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the plurality of light guide channels corresponding to each microlens are distributed centrosymmetrically along an optical axis direction of the same microlens.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, each light guide channel in the plurality of light guide channels corresponding to each microlens forms a preset included angle with a first plane, so that a plurality of optical sensing pixels disposed below each microlens are respectively used for receiving optical signals that are converged by one or more microlenses and transmitted through the corresponding light guide channels, where the first plane is a plane parallel to the display screen.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the preset included angle is in a range from 15 degrees to 60 degrees.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, projections of the plurality of light guide channels corresponding to each microlens on the first plane are symmetrically distributed with respect to a projection center of an optical axis of the same microlens on the first plane.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the optical sensing pixel array includes multiple sets of optical sensing pixels, directions of light guide channels through which optical signals received by the same set of optical sensing pixels in the multiple sets of optical sensing pixels pass are the same, the multiple sets of optical sensing pixels are configured to receive optical signals in multiple directions to obtain multiple images, and the multiple images are used to detect fingerprint information of a finger.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, one of the sets of photo sensor pixels is configured to receive an optical signal in one of the directions to obtain one of the images.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the number of pixels in each of the multiple groups of pixels is equal, and the arrangement manners are the same.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, one optical sensing pixel in one group of optical sensing pixels in the multiple groups of optical sensing pixels corresponds to one pixel point in one image.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, a plurality of consecutive optical sensing pixels in one group of optical sensing pixels in the plurality of groups of optical sensing pixels correspond to one pixel point in one image.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the distribution of the plurality of optically sensitive pixels under each microlens is polygonal.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the polygon is a rectangle or a rhombus.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the at least one light blocking layer is a plurality of light blocking layers, and at least one opening corresponding to each microlens is disposed in different light blocking layers, so as to form a plurality of light guide channels corresponding to each microlens.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the number of the openings corresponding to the same microlens in different light blocking layers is sequentially increased from top to bottom.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the apertures of the openings corresponding to the same microlens in different light blocking layers are sequentially reduced from top to bottom.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, a bottom light-blocking layer of the plurality of light-blocking layers is provided with a plurality of openings corresponding to each microlens, and a plurality of light guide channels corresponding to each microlens respectively pass through a plurality of openings corresponding to a same microlens in the bottom light-blocking layer.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, an opening is disposed in a non-bottom light-blocking layer of the plurality of light-blocking layers at a position intermediate to back focuses of two adjacent microlenses of the plurality of microlenses, and two light guide channels corresponding to the two adjacent microlenses both pass through the openings corresponding to the two adjacent microlenses of the non-bottom light-blocking layer, so that bottom portions of the plurality of light guide channels corresponding to each microlens respectively extend to below the adjacent microlenses.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, an opening is formed in an optical axis of each microlens in a top light blocking layer of the plurality of light blocking layers, and each of the plurality of light guide channels corresponding to each microlens passes through the opening corresponding to the same microlens in the top light blocking layer.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the at least one light blocking layer only includes one light blocking layer, and the plurality of light guide channels are a plurality of inclined through holes corresponding to the same microlens in the one light blocking layer.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, a thickness of the light blocking layer is greater than a preset threshold, so that the plurality of optical sensing pixels disposed below each of the microlenses are respectively configured to receive optical signals collected by one or more microlenses and transmitted through corresponding light guide channels.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, each fingerprint detection unit further includes: a transparent dielectric layer disposed in at least one of the following positions:

the micro-lens array is arranged between the at least one light blocking layer and the at least one light blocking layer, and the at least one light blocking layer and the optical sensing pixel array are arranged between the at least one light blocking layer and the at least one light blocking layer.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, the at least one light-blocking layer is integrally disposed with the microlens array, or the at least one light-blocking layer is integrally disposed with the optically sensitive pixel array.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, each microlens satisfies at least one of the following conditions: the projection of the light-gathering surface of the micro lens on a plane vertical to the optical axis of the micro lens is rectangular or circular; the light-gathering surface of the micro lens is an aspheric surface; the curvatures in all directions of the light-gathering surfaces of the micro lenses are the same; the micro lens comprises at least one lens; and the focal length range of the micro lens is 10um-2 mm.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, the microlens array satisfies at least one of the following conditions: the micro lens array is arranged in a polygon shape, and the duty ratio of the micro lens array ranges from 100% to 50%.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, a period of the microlens array is not equal to a period of the optically sensitive pixel array, and the period of the microlens array is a rational number times of the period of the optically sensitive pixel array.

With reference to the first aspect and the foregoing implementation manner, in another implementation manner of the first aspect, a distance between the fingerprint detection device and the display screen is 20um to 3000 um.

With reference to the first aspect and the foregoing implementation manner of the first aspect, in another implementation manner of the first aspect, each fingerprint detection unit further includes: a filter layer disposed in at least one of the following positions: the micro-lens array is arranged above the micro-lens array, and the micro-lens array and the optical sensing pixel array are arranged between the micro-lens array and the optical sensing pixel array.

In a second aspect, an electronic device is provided, comprising: a display screen; and a fingerprint detection apparatus according to the first aspect as such or any possible implementation manner of the first aspect.

With reference to the second aspect, in an implementation manner of the second aspect, the display screen includes a fingerprint detection area, and the fingerprint detection area is used for providing a touch interface for a finger.

Drawings

Fig. 1 is a schematic front view of an electronic apparatus of an embodiment of the present application.

Fig. 2 is a schematic cross-sectional view of the electronic device in fig. 1 according to an embodiment of the present application.

Fig. 3 is a front view of a fingerprint detection unit in the fingerprint detection device according to the embodiment of the present application.

Fig. 4 is a front view of another fingerprint detection unit in the fingerprint detection device according to the embodiment of the present application.

Fig. 5 is a schematic top view of any microlens and its corresponding optically sensitive pixel in the fingerprint detection unit according to the embodiment of the present application.

Fig. 6 is another schematic top view of an arbitrary microlens and an optical sensing pixel corresponding to the microlens in the fingerprint detection unit according to the embodiment of the present application.

Fig. 7 is a front view of another fingerprint detection unit in the fingerprint detection device according to the embodiment of the present application.

Fig. 8 is a front view of another fingerprint detection unit in the fingerprint detection device according to the embodiment of the present application.

Fig. 9 is a schematic view of a field of view of a fingerprint detection device having a single fingerprint detection unit according to an embodiment of the present application.

Fig. 10 is a schematic diagram illustrating a manner of calculating a field of view of a fingerprint detection device having a single fingerprint detection unit according to an embodiment of the present application.

Fig. 11 is a schematic view of a field of view of a fingerprint detection device having a plurality of fingerprint detection units according to an embodiment of the present application.

Fig. 12 is a schematic front view of an arrangement of two fingerprint detection units according to an embodiment of the present application.

Fig. 13 is a schematic front view of an arrangement of four fingerprint detection units according to an embodiment of the present application.

Fig. 14 is a schematic side view of an arrangement of four fingerprint detection units 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.

The technical scheme of the embodiment of the application can be applied to various electronic devices. Such as portable or mobile computing devices, e.g., smart phones, laptops, tablets, gaming devices, etc., and other electronic devices, e.g., electronic databases, automobiles, Automated Teller Machines (ATMs), etc. However, the present embodiment is not limited thereto.

The technical scheme of the embodiment of the application can be used for the biological feature recognition technology. The biometric technology includes, but is not limited to, fingerprint recognition, palm print recognition, iris recognition, face recognition, and living body recognition. For convenience of explanation, the fingerprint identification technology is described as an example below.

The technical scheme of the embodiment of the application can be used for the under-screen fingerprint identification technology and the in-screen fingerprint identification technology.

Fingerprint identification technique is installed in the display screen below with fingerprint identification module under the screen to realize carrying out the fingerprint identification operation in the display area of display screen, need not set up the fingerprint collection region in the positive region except that the display area of electronic equipment. Specifically, the fingerprint identification module uses the light that returns from the top surface of electronic equipment's display module to carry out fingerprint response and other response operations. This returned light carries information about objects (e.g., fingers) in contact with or in proximity to the top surface of the display assembly, and the fingerprint recognition module located below the display assembly performs underscreen fingerprint recognition by capturing and detecting this returned light. The fingerprint identification module can be designed to realize desired optical imaging by properly configuring an optical element for collecting and detecting returned light, so as to detect fingerprint information of a finger.

Correspondingly, (In-display) fingerprint identification technique means installs inside the display screen fingerprint identification module or partial fingerprint identification module In the screen to realize carrying out the fingerprint identification operation In the display area of display screen, need not set up the fingerprint collection region In the positive region except that the display area of electronic equipment.

Fig. 1 to 2 are schematic views showing an electronic device to which the embodiment of the present application can be applied. Fig. 1 is a front view of the electronic device 10, and fig. 2 is a cross-sectional schematic view of the electronic device 10 shown in fig. 1.

As shown in fig. 1 and 2, the electronic device 10 may include a display screen 120 and an optical fingerprinting module 130.

The display 120 may be a self-luminous display employing display units having self-luminous properties as display pixels. For example, the display screen 120 may be an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. In other alternative embodiments, the Display 120 may also be a Liquid Crystal Display (LCD) or other passive light emitting Display, which is not limited in this embodiment of the present application. Further, the display screen 120 may also be specifically a touch display screen, which not only can perform image display, but also can detect a touch or pressing operation of a user, thereby providing a human-computer interaction interface for the user. For example, in one embodiment, the electronic device 10 may include a Touch sensor, which may be embodied as a Touch Panel (TP), which may be disposed on a surface of the display screen 120, or may be partially or entirely integrated within the display screen 120, thereby forming a Touch display screen.

The optical fingerprint module 130 includes an optical fingerprint sensor including a sensing array 133 having a plurality of optical sensing units 131 (also referred to as optical sensing pixels, light sensing pixels, pixel units, etc.). The sensing area or the sensing area where the sensing array 133 is located is the fingerprint detection area 103 (also called fingerprint collection area, fingerprint identification area, etc.) corresponding to the optical fingerprint module 130.

Wherein, the optical fingerprint module 130 is disposed in a local area below the display screen 120.

As shown in fig. 1, the fingerprint detection area 103 may be located within a display area of the display screen 120. In an alternative embodiment, the optical fingerprint module 130 can be disposed at other positions, such as the side of the display screen 120 or the edge opaque area of the electronic device 10, and the optical path is designed to guide the optical signal from at least a portion of the display area of the display screen 120 to the optical fingerprint module 130, so that the fingerprint detection area 103 is actually located in the display area of the display screen 120.

For the electronic device 10, when a user needs to unlock or perform other fingerprint verification on the electronic device 10, the user only needs to press a finger on the fingerprint detection area 103 of the display screen 120, so as to realize fingerprint input. Since fingerprint detection can be implemented in the screen, the electronic device 10 with the above structure does not need to reserve a space on the front surface thereof to set a fingerprint key (such as a Home key), so that a full-screen scheme can be adopted, that is, the display area of the display screen 120 can be substantially extended to the front surface of the whole electronic device 10.

As shown in FIG. 2, optical fingerprint module 130 may include a light detection portion 134 and an optical assembly 132. The light detecting portion 134 includes a sensing array 133 (also referred to as an optical fingerprint sensor) and a reading circuit and other auxiliary circuits electrically connected to the sensing array 133, which can be fabricated on a chip (Die) by a semiconductor process, such as an optical imaging chip or an optical fingerprint sensor. The sensing array 133 is specifically a Photo detector (Photo detector) array, which includes a plurality of Photo detectors distributed in an array, and the Photo detectors can be used as the above-mentioned optical sensing units. The optical element 132 may be disposed above the sensing array 133 of the light detecting portion 134, and may specifically include a Filter layer (Filter) for filtering ambient light penetrating through the finger, a light guiding layer or a light path guiding structure for guiding the reflected light reflected from the surface of the finger to the sensing array 133 for optical detection, and other optical elements.

In some embodiments of the present application, the optical assembly 132 may be packaged with the same optical fingerprint component as the light detection portion 134. For example, the optical component 132 may be packaged in the same optical fingerprint chip as the optical detection portion 134, or the optical component 132 may be disposed outside the chip where the optical detection portion 134 is located, for example, the optical component 132 is attached to the chip, or some components of the optical component 132 are integrated into the chip.

In some embodiments of the present application, the sensing area or the light sensing range of the sensing array 133 of the optical fingerprint module 130 corresponds to the fingerprint detection area 103 of the optical fingerprint module 130. The fingerprint collecting area 103 of the optical fingerprint module 130 may be equal to or not equal to the area or the light sensing range of the area where the sensing array 133 of the optical fingerprint module 130 is located, which is not specifically limited in the embodiment of the present invention.

For example, the light path is guided by the light collimation method, and the fingerprint detection area 103 of the optical fingerprint module 130 can be designed to be substantially consistent with the area of the sensing array of the optical fingerprint module 130.

For another example, for example, through a light path design such as lens imaging, a reflective folded light path design, or other light path designs such as light converging or reflecting, the area of the fingerprint detection area 103 of the optical fingerprint module 130 may be larger than the area of the sensing array 133 of the optical fingerprint module 130.

The following is an exemplary description of the optical path guiding structure that the optical component 132 may include.

Taking the optical Collimator with the through hole array having the high aspect ratio as an example, the optical Collimator may specifically be a Collimator (collimater) layer made on a semiconductor silicon wafer, and the optical Collimator has a plurality of collimating units or micropores, and the collimating units may specifically be small holes, so that in reflected light reflected from a finger, light perpendicularly incident to the collimating units can pass through and be received by sensor chips below the collimating units, and light with an excessively large incident angle is attenuated by multiple reflections inside the collimating units, and therefore each sensor chip can basically only receive reflected light reflected from fingerprint lines directly above the sensor chip, and image resolution can be effectively improved, and fingerprint identification effect is improved.

Taking the optical path design that the optical path guiding structure includes an optical Lens as an example, the optical path guiding structure may be an optical Lens (Lens) layer having one or more Lens units, such as a Lens group consisting of one or more aspheric lenses, for converging the reflected light reflected from the finger to the sensing array 133 of the light detecting portion 134 therebelow, so that the sensing array 133 may perform imaging based on the reflected light, thereby obtaining the fingerprint image of the finger. Further, the optical lens layer may further be formed with a pinhole or a pinhole diaphragm in the optical path of the lens unit, for example, one or more light-shielding sheets may be formed in the optical path of the lens unit, wherein at least one light-shielding sheet may be formed with a light-transmitting micropore in the optical axis or the optical central region of the lens unit, and the light-transmitting micropore may serve as the pinhole or the pinhole diaphragm. The pinhole or the micro-aperture diaphragm can be matched with the optical lens layer and/or other optical film layers above the optical lens layer to enlarge the view field of the optical fingerprint module 130, so as to improve the fingerprint imaging effect of the optical fingerprint module 130.

Taking the example of the optical path design in which the optical path guiding structure includes a Micro-Lens (Micro-Lens) layer, the optical path guiding structure may be a Micro-Lens array formed by a plurality of Micro-lenses, which may be formed above the sensing array 133 of the light detecting portion 134 through a semiconductor growth process or other processes, and each Micro-Lens may correspond to one of the sensing units of the sensing array 133, respectively. And other optical film layers, such as a dielectric layer or a passivation layer, can be formed between the microlens layer and the sensing unit. More specifically, a light blocking layer (or referred to as a light shielding layer, a light blocking layer, etc.) having micro holes (or referred to as openings) may be further included between the microlens layer and the sensing unit, wherein the micro holes are formed between the corresponding microlenses and the sensing unit, and the light blocking layer may block optical interference between adjacent microlenses and the sensing unit, and enable light corresponding to the sensing unit to be converged into the micro holes through the microlenses and transmitted to the sensing unit through the micro holes for optical fingerprint imaging.

It should be understood that the several implementations described above for the optical path directing structure may be used alone or in combination with one another.

For example, a microlens layer may be further disposed above or below the collimator layer or the optical lens layer. Of course, when the collimator layer or the optical lens layer is used in combination with the microlens layer, the specific stack structure or optical path thereof may need to be adjusted according to actual needs.

On the other hand, the optical assembly 132 may further include other optical elements, such as a Filter (Filter) or other optical film, which may be disposed between the optical path guiding structure and the optical fingerprint sensor or between the display screen 120 and the optical path guiding structure, and mainly used for isolating the influence of external interference light on the optical fingerprint detection. The filter layer may be used to filter ambient light that penetrates the finger and enters the optical fingerprint sensor through the display screen 120, and similar to the optical path guiding structure, the filter layer may be respectively disposed to filter interference light for each optical fingerprint sensor, or may also cover the plurality of optical fingerprint sensors simultaneously with a large-area filter layer.

Fingerprint identification module 140 may be configured to collect fingerprint information (e.g., fingerprint image information) of a user.

Taking the display screen 120 as an example, the display screen has a self-luminous display unit, such as an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. The optical fingerprint module 130 can use the display unit (i.e. OLED light source) of the OLED display screen 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection. When the finger 140 is pressed against the fingerprint detection area 103, the display 120 emits a beam of light 111 toward the target finger 140 above the fingerprint detection area 103, and the light 111 is reflected at the surface of the finger 140 to form reflected light or scattered light (transmitted light) is formed by scattering through the inside of the finger 140.

In the embodiment of the present application, the above-described reflected light and scattered light are collectively referred to as return light for convenience of description. Because the ridges (ridges) 141 and the valleys (valley)142 of the fingerprint have different light reflection capabilities, the reflected light 151 from the ridges and the reflected light 152 from the valleys of the fingerprint have different light intensities, and after passing through the optical assembly 132, the reflected light is received by the sensing array 133 in the optical fingerprint module 130 and converted into corresponding electrical signals, i.e., fingerprint detection signals; based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, so that an optical fingerprint identification function is realized in the electronic device 10.

In other alternatives, the optical fingerprint module 130 may also use an internal light source or an external light source to provide an optical signal for fingerprint detection and identification. In this case, the optical fingerprint module 130 may be applied to not only a self-luminous display screen such as an OLED display screen, but also a non-self-luminous display screen such as a liquid crystal display screen or other passive luminous display screens.

For the lcd having a backlight module and a liquid crystal panel, in order to support the underscreen fingerprint detection of the lcd, the optical fingerprint system of the electronic device 10 may further include an excitation light source for optical fingerprint detection, the excitation light source may specifically be an infrared light source or a light source of specific wavelength non-visible light, which may be disposed below the backlight module of the lcd or in an edge area below a protective cover plate of the electronic device 10, and the optical fingerprint module 130 may be disposed below the edge area of the lcd or the protective cover plate and guided through a light path so that the fingerprint detection light may reach the optical fingerprint module 130; alternatively, the optical fingerprint module 130 may be disposed under the backlight module, and the backlight module may be perforated or otherwise optically designed to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint module 130 by performing perforation or other optical designs on the diffusion sheet, the brightness enhancement sheet, the reflection sheet, and other film layers. When the optical fingerprint module 130 is used to provide an optical signal for fingerprint detection by using an internal light source or an external light source, the detection principle is the same as that described above.

In particular implementations, the electronic device 10 may further include a transparent protective cover, which may be a glass cover or a sapphire cover, positioned over the display screen 120 and covering the front of the electronic device 10. Therefore, in the embodiment of the present application, the pressing of the finger on the display screen 120 actually means pressing on the cover plate above the display screen 120 or the surface of the protective layer covering the cover plate.

On the other hand, this optics fingerprint module 130 can only include an optics fingerprint sensor, and the area of the fingerprint detection area 103 of optics fingerprint module 130 is less and the rigidity this moment, therefore the user need press the specific position of this fingerprint detection area 103 with the finger when carrying out the fingerprint input, otherwise optics fingerprint module 130 probably can't gather the fingerprint image and cause user experience not good. In other alternative embodiments, the optical fingerprint module 130 may specifically include a plurality of optical fingerprint sensors. This a plurality of optical fingerprint sensor can set up side by side in the below of this display screen 120 through the concatenation mode, and this a plurality of optical fingerprint sensor's induction area constitutes the fingerprint detection area 103 of this optical fingerprint module 130 jointly. Thereby the fingerprint detection area 103 of this optics fingerprint module 130 can extend to the main area of the lower half of this display screen, extends to the finger and presses the region usually promptly to realize blind formula fingerprint input operation of pressing. Further, when the number of the optical fingerprint sensors is sufficient, the fingerprint detection area 103 may also be extended to a half display area or even the entire display area, thereby achieving half-screen or full-screen fingerprint detection.

With the development of terminal products, the requirements on the identification performance of the finger print under the screen are higher and higher. However, in some scenarios, there may be a problem of a dry finger, the contact area between the dry finger and the display screen is very small, the recognition response area is very small, the acquired fingerprint is discontinuous, the feature points are easy to lose, and the performance of fingerprint recognition is affected. Therefore, this application embodiment provides a fingerprint detection device, can solve present fingerprint identification's scheme and not good enough problem to the fingerprint identification effect of dry finger, also can promote the fingerprint identification performance to dry finger promptly.

Specifically, the fingerprint detection device of this application embodiment is applicable to the display screen below in order to realize optical fingerprint detection under the screen. The fingerprint detection device in the embodiment of the application comprises a plurality of fingerprint detection units. Any one of the plurality of fingerprint detection units will be described in detail below with reference to fig. 3 to 8.

In particular, fig. 3 and 4 each show a schematic view of the fingerprint detection unit 20 of the embodiment of the present application. The fingerprint detection unit 20 may be suitable for the electronic device 10 shown in fig. 1 to 2, or the fingerprint detection unit 20 may be the optical fingerprint module 130 shown in fig. 1 to 2.

As shown in fig. 3 and 4, the fingerprint detection unit 20 may include a microlens array 210, at least one light blocking layer, and an optically sensitive pixel array 240. The microlens array 210 may be configured to be disposed under a display screen of an electronic device, the at least one light blocking layer may be disposed under the microlens array 210, and the optically sensitive pixel array 240 may be disposed under the at least one light blocking layer.

It should be understood that the microlens array 210 and the at least one light blocking layer may be light guide structures included in the optical assembly 132 shown in fig. 2, and the photo sensor pixel array 240 may be the sensor array 133 having a plurality of photo sensor units 131 (also referred to as photo sensor pixels, pixel units, etc.) shown in fig. 1 to 2, and therefore, for brevity, no further description is provided herein.

In the embodiment of the present application, the microlens array 210 may include a plurality of microlenses. For example, as shown in fig. 3 and 4, the microlens array 210 may include first microlenses 211, second microlenses 212, and third microlenses 213. The at least one light-blocking layer may include a plurality of light-blocking layers, for example, as shown in fig. 3 and 4, the at least one light-blocking layer may include a first light-blocking layer 220 and a second light-blocking layer 230. The photo-sensing pixel array 240 may include a plurality of photo-sensing pixels, for example, as shown in fig. 3 and 4, the photo-sensing pixel array 240 may include a first photo-sensing pixel 241, a second photo-sensing pixel 242, a third photo-sensing pixel 243, a fourth photo-sensing pixel 244, a fifth photo-sensing pixel 245, and a sixth photo-sensing pixel 246.

Alternatively, each microlens in the microlens array 210 may be filled in a circle or a square; in addition, the material of each microlens in the microlens array 210 may be plastic or glass; each microlens production process in the microlens array 210 may be implemented by a micro-nano processing process or a die-pressing process, and the embodiment of the present application is not limited thereto.

In the embodiment of the present application, the at least one light-blocking layer and the microlens array 210 may be integrally disposed, or the at least one light-blocking layer and the optically sensitive pixel array 240 may be integrally disposed, even if the microlens array 210, the at least one light-blocking layer, and the optically sensitive pixel array 240 are integrally disposed as one component, which is not limited thereto.

Optionally, each microlens in the microlens array 210 may satisfy at least one of the following conditions: the projection of the light-gathering surface of the micro lens on a plane vertical to the optical axis of the micro lens is rectangular or circular; the light-gathering surface of the micro lens is spherical or aspherical; the curvatures in all directions of the light-gathering surface of the micro lens are the same; the micro lens comprises at least one lens; and the focal length range of the micro lens is 10um-2 mm.

In the embodiment of the present application, the microlens array 210 satisfies at least one of the following conditions: the microlens array 210 is arranged in a polygon and the duty ratio of the microlens array 210 ranges from 100% to 50%. For example, the microlens array 210 may be arranged in a square or hexagonal pattern. Also for example, the duty cycle of the microlens array 210 is 85%.

In the embodiment of the present application, the period of the microlens array 210 is not equal to the period of the optical sensor pixel array 240, and the period of the microlens array 210 is a rational number times of the period of the optical sensor pixel array 240, so as to avoid the occurrence of moire fringes during the fingerprint imaging process and improve the fingerprint identification effect.

In this embodiment of the application, the distance between the fingerprint detection unit 20 and the display screen may be set to 20um-1000um according to practical applications, for example, to ensure that the fingerprint detection unit 20 and the display screen have a sufficient safety distance, and further ensure that the device is not damaged due to the fact that the fingerprint detection unit 20 collides with the display screen due to vibration or falling of the electronic device.

It should be understood that the at least one light-blocking layer of the embodiment of the present application is formed with a plurality of light-guiding channels corresponding to each microlens in the microlens array 210, and an included angle between each light-guiding channel of the plurality of light-guiding channels corresponding to each microlens and an optical axis of its corresponding microlens is smaller than 90 °, that is, for any microlens, its corresponding plurality of light-guiding channels are inclined, rather than vertical.

It should be noted that the included angle may be an included angle between a central axis of the light guide channel and an optical axis of the microlens, or an included angle between any straight line passing through the light guide channel and the optical axis; in addition, the included angle may range from 0 ° to 90 °, for example, the included angle may range from 15 ° to 60 °, or may range from 10 ° to 70 °, for example, the included angle may be equal to 20 °, or may also be equal to 40 °, but the embodiment of the present application is not limited thereto.

It should be understood that the included angle between the light guide channel and the optical axis of its corresponding microlens can be set to any value different from 90 ° according to practical applications, for example, the size of the included angle between the light guide channel and the optical axis of its corresponding microlens can be adjusted by appropriately adjusting the distances between the microlens array 210, the at least one light blocking layer, and the optically sensitive pixel array 240. Because the included angle between the light guide channel and the optical axis of the corresponding microlens is not equal to 90 °, the bottommost part of the light guide channels of the same microlens may be located below the same microlens, or may be located below different microlenses.

Alternatively, for any one microlens, the bottom of the plurality of light-guiding channels corresponding to that microlens may still be located below that microlens, for example, as shown in fig. 4.

Alternatively, for any one microlens, the bottom of the light guide channels corresponding to the microlens may also be located not below the microlens, but below other different microlenses. For example, the bottoms of the light guide channels corresponding to the same microlens may extend to the lower side of the adjacent microlenses, for example, as shown in fig. 3; alternatively, the bottoms of the light guide channels corresponding to the same microlens may also extend to the lower side of other microlenses that are not adjacent to the microlens, respectively.

It should be understood that, for convenience of description, the following description will be given by taking an example that the bottoms of the light guide channels corresponding to each microlens extend to the lower side of the adjacent microlenses as an example with reference to fig. 3, and an example that the bottoms of the light guide channels corresponding to each microlens are still located below the microlens as an example with reference to fig. 4, for other cases, the above description may be implemented by adjusting the distance between the microlens array 210, the at least one light blocking layer, and the optical sensing pixel array 240, or adjusting the size of the included angle between the light guide channel and the optical axis of the corresponding microlens, and the details are not repeated herein for brevity.

Specifically, as shown in fig. 3, at least one opening is disposed in each of the first light-blocking layer 220 and the second light-blocking layer 230, so as to form a plurality of light-guiding channels corresponding to each of the microlenses (i.e., the first microlens 211, the second microlens 212, and the third microlens 213). Specifically, for convenience of description, a description will be given here taking, as an example, a hole included in a range of an area that can be covered by a position below each microlens, hereinafter simply referred to as a coverage of the microlens. For example, in fig. 3, the first light blocking layer 220 is provided with a first opening 221 and a second opening 222 within the coverage of the first microlens 211; the first light-blocking layer 220 is further provided with a second opening 222 and a third opening 223 within the coverage of the second microlens 212; the first light blocking layer 220 is further provided with a third opening 223 and a fourth opening 224 within the coverage of the third microlens 213; for another example, fig. 4 also has a similar configuration, and the specific configuration is shown in fig. 4 and is not described herein again.

Similarly, as shown in fig. 3, the second light-blocking layer 230 is provided with a fifth opening 231 and a sixth opening 232 within the coverage of the first microlens 211; the second light-blocking layer 230 is further provided with a seventh opening 233 and an eighth opening 234 within the coverage of the second microlens 212; the second light-blocking layer 230 further includes a ninth opening 235 and a tenth opening 236 covered by the third microlens 213. Similarly, fig. 4 also has a similar configuration, and the specific configuration is shown in fig. 4 and is not described herein again.

For convenience of explanation, the second microlens 212 is mainly described below as an example, but the description thereof can be applied to the first microlens 211 and the third microlens 213 as well. Specifically, as shown in fig. 3, the plurality of light-guiding channels corresponding to the second microlenses 212 may include light-guiding channels formed by the second opening 222 and the sixth opening 232, and light-guiding channels formed by the third opening 223 and the ninth opening 235. In addition, the light guide channel formed by the second and

sixth openings

222 and 232 extends below the first microlens 211, and the light guide channel formed by the third and

ninth openings

223 and 235 extends below the third microlens 213. As shown in fig. 4, the plurality of light guide channels corresponding to the second microlenses 212 may include: a light-conducting channel formed by opening 226 and opening 233, a light-conducting channel formed by opening 226 and opening 234, a light-conducting channel formed by opening 227 and opening 233, and a light-conducting channel formed by opening 227 and opening 234. In addition, the four light guide channels all extend to the lower side of the second microlens 211.

It should be understood that the holes corresponding to any one of the microlenses described in the embodiments of the present application refer to a plurality of holes through which its corresponding light-guiding channels pass, for example, the holes corresponding to the second microlenses 212 refer to a plurality of holes through which its light-guiding channels pass, for example, the holes corresponding to the second microlenses 212 in fig. 3 may include the holes through which the two light-guiding channels pass, that is, the holes corresponding to the second microlenses 212 include at least the second opening 222, the sixth opening 232, the third opening 223, and the ninth opening 235; for another example, the holes corresponding to the second microlenses 212 in fig. 4 can include the holes of the four light guide channels, i.e., the hole 226, the hole 227, the hole 233, and the hole 234.

Further, an optically sensitive pixel may be disposed below each of the plurality of light guide channels corresponding to each microlens in the microlens array 210.

Still taking the second microlens 212 in fig. 3 as an example, a second photo-sensing pixel 242 is disposed below the light guide channel formed by the second opening 222 and the sixth opening 232, and a fifth photo-sensing pixel 245 is disposed below the light guide channel formed by the third opening 223 and the ninth opening 235. For the second microlens 221 in fig. 4, a third photo-sensing pixel 243 is disposed below the light guide channel formed by the opening 226 and the opening 233 and the light guide channel formed by the opening 227 and the opening 233; a fourth photo-sensing pixel 244 is disposed below the light-guiding channel formed by the opening 226 and the opening 234 and the light-guiding channel formed by the opening 227 and the opening 234.

Furthermore, a plurality of optical sensing pixels are disposed below each microlens in the microlens array 210, and the plurality of optical sensing pixels disposed below each microlens are respectively used for receiving optical signals collected by one or more microlenses and transmitted through corresponding light guide channels, and the optical signals are used for detecting fingerprint information of a finger. That is to say, for any one microlens, if the bottoms of the light guide channels corresponding to the microlens are still located below the microlens, the plurality of optical sensing pixels disposed below the microlens are respectively used for receiving the optical signals collected by the microlens and transmitted through the light guide channels corresponding to the microlens; or, if the bottoms of the light guide channels corresponding to the microlenses extend to the lower portions of the adjacent microlenses, the plurality of optical sensing pixels disposed below the microlenses are respectively used for receiving the optical signals converged by the adjacent microlenses and transmitted through the corresponding light guide channels.

Still taking the second microlens 212 in fig. 3 as an example, two optical sensing pixels are disposed in a range directly under the second microlens 212 in fig. 3, that is, a third optical sensing pixel 243 and a fourth optical sensing pixel 244 may be disposed under the second microlens 212, wherein the third optical sensing pixel 243 may be configured to receive the oblique optical signals converged by the first microlens 211 and transmitted through the light guide channel formed by the second opening 222 and the seventh opening 233, the fourth optical sensing pixel 244 may be configured to receive the oblique optical signals converged by the third microlens 213 and transmitted through the light guide channel formed by the third opening 223 and the eighth opening 234, and the first microlens 211 and the third microlens 213 are adjacent to the second microlens 212.

For another example, as shown in fig. 4, still taking the second microlens 212 as an example, two optical sensing pixels are disposed in a range directly below the second microlens 212, that is, a third optical sensing pixel 243 and a fourth optical sensing pixel 244 may be disposed below the second microlens 212, where the third optical sensing pixel 243 may be configured to receive the oblique optical signal that is converged by the second microlens 212 and transmitted through the light guide channel formed by the opening 226 and the opening 233, and the third optical sensing pixel 243 may also be configured to receive the oblique optical signal that is converged by the second microlens 212 and transmitted through the light guide channel formed by the opening 227 and the opening 233; similarly, the fourth photo-sensing pixel 244 can be configured to receive the oblique light signal focused by the second microlens 212 and transmitted through the light-guiding channel formed by the opening 226 and the opening 234, and the fourth photo-sensing pixel 244 can also be configured to receive the oblique light signal focused by the second microlens 212 and transmitted through the light-guiding channel formed by the opening 227 and the opening 234.

In addition, the number of the plurality of optically sensitive pixels under each microlens in the microlens array 210 may be set according to practical applications, for example, in the embodiment of the present application, 4 optically sensitive pixels are set under each microlens; alternatively, each microlens may correspond to 9 optically sensitive pixels, or may be provided in other numbers, and the embodiment of the present application is not limited thereto. In addition, the distribution of the plurality of optically sensitive pixels under each microlens may be polygonal. For example, the polygon includes, but is not limited to, a rectangle or a diamond. For another example, the distribution of the plurality of optically sensitive pixels under each microlens in the microlens array 210 may be circular or elliptical.

Because the micro lenses in the micro lens array are distributed in an array manner, when the distribution of the plurality of optical sensing pixels below each micro lens is polygonal, the corresponding modes of the micro lens array and the optical sensing array can be effectively simplified, and further, the structural design of the fingerprint detection unit is simplified. In particular, fig. 5 and 6 are two schematic top views of the second microlenses 212 shown in fig. 3 or 4, respectively. As shown in fig. 5 and fig. 6, it is assumed that 4 optically sensitive pixels may be disposed under the second microlens 212, wherein the distribution of the 4 optically sensitive pixels in fig. 5 is rectangular, and the distribution of the 4 microlenses in fig. 6 is rhombic.

It should be noted that, in the embodiments of the present application, a specific corresponding manner of each microlens and the optically sensitive pixel below the microlens is not limited. Taking the third photo-sensing pixel 243 under the second microlens 212 as an example, the second microlens 212 may cover a part or all of the photosensitive area (AA) of the third photo-sensing pixel 243. Preferably, taking the light-guiding channel of fig. 3 as an example, the second microlens 212 may cover an area of the light-sensing area (PD area, AA) of the third photo-sensing pixel 243, where oblique light signals converged by the first microlens 211 and transmitted through the light-guiding channel formed by the second opening 222 and the seventh opening 233 can be irradiated, for example, a diagonally shaded area in each of the light-sensing areas in fig. 5 and 6, so as to ensure that the third photo-sensing pixel 243 can receive enough light signals, so as to improve the fingerprint identification effect.

The following describes in detail the design of the plurality of light guide channels for each microlens.

In some embodiments of the present application, the plurality of light guide channels corresponding to each microlens in the microlens array 210 may be distributed along the optical axis of the same microlens. A plurality of light guide channels corresponding to each micro lens are arranged in a centrosymmetric mode, so that the process complexity of the fingerprint detection unit can be reduced, namely the process complexity of the whole fingerprint detection device can be reduced.

Still taking the second microlens 212 in fig. 3 as an example, as shown in fig. 5, for the light guide channel of the second microlens 212, which can extend to the light guide channel under the upper-right microlens and can extend to the light guide channel under the lower-left microlens, the two are centrosymmetric along the optical axis direction of the second microlens 212; for the light guide channels of the second microlenses 212, the light guide channels can extend to the lower portion of the upper-left microlens and the light guide channels can extend to the lower portion of the lower-right microlens, and the light guide channels are also centrosymmetric along the optical axis direction of the second microlenses 212. The light-conducting channels in fig. 4 are also similar and will not be described herein again for brevity.

In some embodiments of the present application, each of the plurality of light guide channels corresponding to each microlens in the microlens array 210 and a first plane may form a preset included angle, so that a plurality of optically sensitive pixels disposed below each microlens are respectively used for receiving optical signals converged by one or more microlenses and transmitted through the corresponding light guide channel, where the first plane is a plane parallel to the display screen. The bottom ends of a plurality of light guide channels corresponding to each microlens can be ensured to respectively extend to the lower part of the same microlens or extend to the lower parts of a plurality of adjacent microlenses through the preset included angle.

As shown in fig. 3 and 5, still taking the second microlens 212 as an example, the plane of the optically sensitive pixel array 240 is parallel to the first plane, the light-guiding channel formed by the second opening 222 and the sixth opening 232 forms a first angle with the plane of the optically sensitive pixel array 240, and the light-guiding channel formed by the third opening 223 and the ninth opening 235 forms a second angle with the plane of the optically sensitive pixel array 240. Wherein the first angle is equal to the second angle. Of course, in other alternative embodiments, the first angle may not be equal to the second angle, which is not limited by the embodiments of the present application. And the light-guiding channels in fig. 4 are also similar, and are not described herein again for brevity.

It should be noted that the preset included angle may be an included angle between a central axis of the light guide channel and the first plane, or an included angle between any straight line passing through the light guide channel and the first plane; in addition, the preset included angle may range from 0 degree to 90 degrees, for example, the preset included angle may range from 15 degrees to 60 degrees, and may also range from 10 degrees to 70 degrees, which is not specifically limited in the present application.

In some embodiments of the present application, the projections of the plurality of light guide channels corresponding to each microlens in the microlens array 210 on the first plane may be distributed in central symmetry with respect to the projection of the optical axis of the same microlens on the first plane, so as to ensure that each optical sensing pixel in the optical sensing pixel array 240 can receive enough optical signals, thereby improving the resolution of the fingerprint image and the fingerprint identification effect.

As shown in fig. 3 and fig. 5, still taking the second microlens 212 as an example, since each light guide channel is an inclined channel, the end surface of each light guide channel on the first plane is elliptical, and the 4 light guide channels corresponding to the second microlens 212 are symmetrically distributed on the end surface close to the optically sensitive pixel array 240 along the projection center of the optical axis of the second microlens 212 on the first plane.

The implementation of at least one light-blocking layer in the fingerprint detection unit 20 is explained in detail below.

In some embodiments of the present application, the fingerprint detection unit 20 may include a plurality of light-blocking layers, and at least one opening corresponding to each microlens is disposed in different light-blocking layers to form a plurality of light-guiding channels corresponding to the microlens. For example, the at least one light-blocking layer may include first light-blocking layer 220 and second light-blocking layer 230 described above with respect to fig. 3 or 4. For another example, in addition to the two light-blocking layers described in fig. 3 and fig. 4, the fingerprint detection unit 20 may further include more light-blocking layers, and taking fig. 3 as an example, fig. 7 is another schematic structural diagram of the fingerprint detection unit 20 according to the embodiment of the present application. As shown in fig. 7, the fingerprint detection unit 20 may further include a third light-blocking layer 260 in addition to the first light-blocking layer 220 and the second light-blocking layer 230 shown in fig. 3, wherein the third light-blocking layer 260 includes an eleventh opening 261, a twelfth opening 262, and a thirteenth opening 263. For convenience of explanation, the following description will be mainly given by taking fig. 3 and 7 as an example.

In some implementations, the number of apertures corresponding to the same microlens in different light blocking layers may be the same, for example, as shown in fig. 4; or the number of the openings corresponding to the same microlens in different light blocking layers can be sequentially increased or decreased from top to bottom to form a plurality of light guide channels corresponding to each microlens.

For example, the number of the openings corresponding to the same microlens in different light-blocking layers may be sequentially increased from top to bottom, in other words, the distance between the openings in different light-blocking layers may be sequentially decreased from top to bottom. For example, as shown in fig. 3, a distance D between two adjacent openings in the first light-blocking layer 220 is greater than a distance D between two adjacent openings in the second light-blocking layer 230. Most of light signals which are not expected to be received by the fingerprint detection units are shielded by the upper light-blocking layers with smaller aperture density in the plurality of light-blocking layers, and a plurality of light guide channels corresponding to each microlens can be formed by the upper light-blocking layers with smaller aperture density and the lower light-blocking layers with larger aperture density in the plurality of light-blocking layers. In addition, the complexity of the preparation of the at least one light-blocking layer can be reduced and the strength of the upper partial light-shielding layer can be increased.

In this embodiment, a plurality of openings corresponding to each microlens may be disposed in a bottom light-blocking layer of the plurality of light-blocking layers, and a plurality of light guide channels corresponding to each microlens respectively pass through a plurality of openings corresponding to a same microlens in the bottom light-blocking layer. For example, as shown in fig. 3 and fig. 7, still taking the second microlens 212 as an example, a sixth opening 232 and a ninth opening 235 corresponding to the second microlens 212 are disposed on the second light-blocking layer 230, and two light-guiding channels of the plurality of light-guiding channels of the second microlens 212 respectively pass through the sixth opening 232 and the ninth opening 235.

In this embodiment, an opening may be disposed on an optical axis of each of the microlenses in a top light-blocking layer of the plurality of light-blocking layers, and the plurality of light guide channels corresponding to the microlenses all pass through the opening corresponding to the microlens in the top light-blocking layer. For example, as shown in fig. 7, for the second microlens 212, the third light-blocking layer 260 may be provided with a twelfth opening 262 at a position close to the first light-blocking layer 220 in the optical axis direction of the second microlens 260. At this time, one light-guiding channel corresponding to the second microlens 212 passes through the twelfth opening 262, the second opening 222 and the sixth opening 232, and the other light-guiding channel corresponding to the second microlens 212 passes through the twelfth opening 262, the third opening 223 and the ninth opening 235, i.e. both light-guiding channels of the second microlens 212 pass through the twelfth opening 262.

In the embodiment of the present application, for a case that bottoms of a plurality of light guide channels corresponding to the same microlens extend to a position below an adjacent microlens, an opening may be disposed in a non-bottom light blocking layer of the plurality of light blocking layers at a middle position of back focuses of two adjacent microlenses of the plurality of microlenses, and then both of the two light guide channels corresponding to the two adjacent microlenses pass through openings corresponding to the two adjacent microlenses of the non-bottom light blocking layer.

For example, as shown in fig. 3 and 7, for the second microlens 212, the first light blocking layer 220 may have a second opening 222 at a position intermediate between the back focal point of the first microlens 211 and the back focal point of the second microlens 212, and each of the first microlens 211 and the second microlens 212 has a light guide channel passing through the second opening 222; similarly, the first light blocking layer 220 may be provided with a third opening 223 at a position intermediate between the back focal point of the third microlens 213 and the back focal point of the second microlens 212, and a light guide channel is formed through the third opening 223 by each of the third microlens 213 and the second microlens 212.

In other implementations, the apertures of the openings corresponding to the same microlens in different light-blocking layers may be sequentially increased, decreased, or unchanged from top to bottom to screen out the light signals expected to be received by the optically sensitive pixel array 240.

For example, as shown in fig. 7, for three light-blocking layers from top to bottom, the aperture of the opening in the third light-blocking layer 260 of the upper layer is larger than the aperture of the opening in the first light-blocking layer 220 of the intermediate layer, and the aperture of the opening in the first light-blocking layer 220 of the intermediate layer is larger than the aperture of the opening in the second light-blocking layer 230 of the lower layer.

Alternatively, the fingerprint detection unit 20 includes two or three light-blocking layers respectively as described above, and similarly, the fingerprint detection unit 20 may further include more light-blocking layers, or the fingerprint detection unit 20 may also include only one light-blocking layer, and the embodiment of the present application is not limited thereto.

For example, in the case that the fingerprint detection unit 20 includes only one light-blocking layer, a plurality of oblique through holes may be disposed on the one light-blocking layer, that is, the plurality of light-guiding channels of any one microlens may be a plurality of oblique through holes corresponding to the microlens on the light-blocking layer. For example, the thickness of the light blocking layer is greater than a preset threshold, so that the plurality of optical sensing pixels disposed below each microlens are respectively used for receiving the optical signals collected by the same microlens or the plurality of microlenses adjacent to the same microlens and transmitted through the corresponding light guide channel.

Optionally, the fingerprint detection unit 20 of the embodiment of the present application may further include a transparent medium layer 250. As shown in fig. 3, 4 and 7, the transparent medium layer 250 may be disposed at least one of the following positions: between the microlens array 210 and the at least one light blocking layer, between the at least one light blocking layer, and between the at least one light blocking layer and the optically sensitive pixel array 240.

For example, as shown in fig. 3 and 4, the transparent medium layer 250 may include a first medium layer 251 between the microlens array 210 and the at least one light blocking layer (i.e., the first light blocking layer 220) and a second medium layer 252 between the first light blocking layer 220 and the second light blocking layer 230.

For another example, as shown in fig. 7, the transparent dielectric layer 250 may include: a first dielectric layer 251 between the microlens array 210 and the at least one light-blocking layer (i.e., the third light-blocking layer 260), and a second dielectric layer 252 between the three light-blocking layers, wherein the second dielectric layer 252 includes the second dielectric layer 252 between the third light-blocking layer 260 and the first light-blocking layer 220, and the second dielectric layer 252 between the first light-blocking layer 220 and the second light-blocking layer 230.

The material of the transparent medium layer 250 is any transparent material transparent to light, such as glass, and may also be air or vacuum transition, which is not specifically limited in this application.

Optionally, the fingerprint detection unit 20 of the embodiment of the present application may further include a filter layer. Fig. 8 is another schematic structural diagram of the fingerprint detection unit 20 according to an embodiment of the present disclosure, and as shown in fig. 8, the fingerprint detection unit 20 may further include a filter layer 270, where the filter layer 270 may be disposed at least one of the following positions: above the microlens array 210, between the microlens array 210 and the at least one light blocking layer; between the at least one light-blocking layer; and between the at least one light blocking layer and the optically sensitive pixel array 240. For example, the filter layer 270 may be disposed between the photo-sensing pixel array 240 and the second light-blocking layer 230. For example, the filter layer 270 may be a filter layer in the optical assembly 132 referred to above.

The filter layer 270 may be used to reduce unwanted ambient light in fingerprint sensing to improve the optical sensing of the received light by the optically sensitive pixel array 240. The filter layer 270 may be specifically configured to filter out light of a specific wavelength, such as near infrared light and a portion of red light. For example, a human finger absorbs most of the energy of light with a wavelength below 580nm, and if one or more optical filters or optical filter layers are designed to filter light with a wavelength from 580nm to infrared, the effect of ambient light on the optical detection in fingerprint sensing can be greatly reduced.

For example, the filter layer 270 may include one or more optical filters, which may be configured, for example, as band pass filters to allow transmission of light emitted by the OLED screen while blocking other light components such as infrared light in sunlight. Such optical filtering can effectively reduce background light caused by sunlight when the fingerprint detection unit 20 is used outdoors under a screen. The one or more optical filters may be implemented, for example, as optical filter coatings formed on one or more continuous interfaces, or may be implemented as one or more discrete interfaces. It should be understood that the filter layer 270 may be formed at any position along the optical path from the reflected light formed by the reflection of the finger to the photo sensor pixel array 240, which is not specifically limited in the embodiments of the present application.

In addition, the light inlet surface of the filter layer 270 may be provided with an optical inorganic coating or an organic black coating, so that the reflectivity of the light inlet surface of the filter layer 270 is lower than a first threshold value, for example, 1%, thereby ensuring that the optical sensing pixel array 240 can receive sufficient optical signals, and further improving the fingerprint identification effect.

For example, the filter layer 270 is fixed on the upper surface of the photo sensor pixel array 240 by a fixing device. The filter layer 270 and the photo sensor pixel array 240 may be fixed by dispensing in the non-photosensitive area of the photo sensor pixel array 240, and there is a gap between the filter layer 270 and the photosensitive area of the photo sensor pixel array 240. Or the lower surface of the filter layer 270 is fixed on the upper surface of the optically sensitive pixel array 240 by glue with a refractive index lower than a predetermined refractive index, for example, but not limited to, 1.3.

Therefore, the fingerprint detection device of the embodiment of the application comprises a plurality of fingerprint detection units, each fingerprint detection unit is arranged based on the technical scheme, and the following technical problems can be at least solved: 1. the problem that the recognition effect of the vertical optical signal on the dry finger is too poor; 2. the problem of too long exposure time of the single-object telecentric micro-lens array scheme is solved; 3. the problem of excessive thickness of the fingerprint detection device; 4. the tolerance of the fingerprint detection device is too poor; 5. the problem of oversize of the fingerprint detection device.

Aiming at the problem 1, a plurality of light guide channels are designed for each micro lens, and an included angle between each light guide channel in the plurality of light guide channels corresponding to each micro lens and the optical axis of the corresponding micro lens is smaller than 90 degrees, correspondingly, a plurality of optical sensing pixels under each micro lens can respectively receive inclined light signals which are converged by the same micro lens or a plurality of adjacent micro lenses and transmitted through the corresponding light guide channels, and therefore fingerprint information of a dry finger can be detected by utilizing the inclined light signals. When dry finger print and OLED screen contact are not good, the fingerprint ridge of the fingerprint image of vertical direction and the contrast of fingerprint valley are poor, and the image is blurred to can not distinguish the fingerprint line, and this application lets the light path receive incline direction light signal through reasonable light path design, when can be better acquireing normal finger print, the detection that can be better indicates the fingerprint image futilely. In normal life scenes, such as washing hands off, getting up in the morning, plastering fingers, low temperature and the like, fingers are usually dry, the cuticle of the fingers is not uniform, and when the fingers are pressed on an OLED screen, poor contact can occur in local areas of the fingers. The appearance of this kind of condition causes current optical fingerprint scheme not good to dry hand fingerprint identification's effect, and the beneficial effect of this application just promotes dry hand fingerprint imaging effect, lets dry hand fingerprint image become clear.

In addition, the optically sensitive pixel array 240 can also expand the field angle and the field of view of the optically sensitive pixel array 240 by receiving the oblique light signal, for example, the field of view of the fingerprint detection unit 20 capable of receiving the oblique light can be defined by 6 × 9mm²Expansion to 7.5x10.5mm²And the fingerprint identification effect is further improved.

Moreover, a plurality of optical sensing pixels are arranged below each microlens, so that the space period of the lens array 210 is not equal to the space period of the optical sensing pixel array 240, moire fringes can be avoided from appearing in the fingerprint image, and the fingerprint identification effect is improved.

Aiming at the problem 2, a plurality of light guide channels are designed for each micro lens, and each light guide channel corresponds to an optical sensing pixel so as to receive an optical signal passing through the light guide channel, that is, an imaging optical path matched with a single micro lens and a plurality of optical sensing pixels can be formed. That is, the single microlens can multiplex optical signals at multiple angles (for example, as shown in fig. 5 or fig. 6, the single microlens can multiplex optical signals at 4 angles), so that light beams at different object aperture angles can be divided and imaged, the light incident amount of each fingerprint detection unit is effectively increased, the light incident amount of the fingerprint detection device is also increased, and the exposure time of the optical sensing pixel array can be reduced. The aperture angle is an angle formed by an object point on the optical axis of the microlens and the effective diameter of the front lens of the microlens, and the amount of light entering the microlens increases as the aperture angle of the microlens increases, and is proportional to the effective diameter of the microlens and inversely proportional to the distance from the focal point.

Specifically, since the plurality of optical sensing pixels under each microlens can receive the oblique light signals transmitted by the corresponding light guide channel, the optical sensing pixel array can be divided into a plurality of optical sensing pixel groups according to the direction of the light guide channel, wherein each optical sensing pixel in each optical sensing pixel group is used for receiving the oblique light signal having the same direction as the light guide channel corresponding to the same optical sensing pixel group, that is, each optical sensing pixel group can generate one fingerprint image based on the received oblique light signal, and thus the plurality of optical sensing pixel groups can be used for generating a plurality of fingerprint images.

With reference to fig. 5 or fig. 6, the optical sensing pixel array 240 may respectively converge the oblique light signals to the 4 optical sensing pixels through the 4 light guide channels corresponding to each microlens, that is, the optical sensing pixel array 240 may be divided into 4 optical sensing pixel groups for forming 4 fingerprint images, and a fingerprint image with a higher resolution may be obtained based on the 4 fingerprint images, so as to improve the fingerprint identification effect.

Therefore, each micro lens can converge inclined light signals to multiple directions through multiple light guide channels, or the optical sensing pixel array can simultaneously acquire multiple fingerprint images through light path design, so that even if the exposure time of the optical sensing pixel array is reduced, and the resolution of each fingerprint image is low, multiple fingerprint images with low resolution can be processed, and a fingerprint image with high resolution can be obtained.

That is to say, based on the above technical solution, the exposure duration of the optical sensing pixel array 240 (i.e. the image sensor) can be reduced while ensuring the fingerprint identification effect.

For problem 3, the object side light beam of the fingerprint under the screen can be subjected to non-direct light imaging (i.e. oblique light imaging) through the imaging light path formed by matching the single microlens and the multiple optical sensing pixels, and especially, the multiple optical sensing pixels arranged below each microlens are respectively used for receiving the light signals converged by the adjacent multiple microlenses, so that the object side numerical aperture of the optical system can be enlarged, the thickness of the light path design (i.e. the thickness of the at least one light blocking layer) of the optical sensing pixel array can be shortened, and finally, the thickness of each fingerprint detection unit can be effectively reduced, and the thickness of the fingerprint detection device can be reduced.

Aiming at the problem 4, the object space light beam of the fingerprint under the screen can be subjected to non-direct light imaging through the imaging light path formed by matching the single micro lens and the multiple optical sensing pixels, the object space numerical aperture of the optical system can be enlarged, and the robustness of the system and the tolerance of the fingerprint detection unit 20 are further improved. Wherein the numerical aperture may be a product of a refractive index (h) of a medium between a front lens of the microlens and the object to be inspected and a sine of half of the aperture angle (u).

To the problem 5, through the imaging optical path of the single microlens and the multiple optical sensing pixels, and the light guide channel arranged in the at least one light blocking layer, the density of the optical sensing pixels in the optical sensing pixel array 240 can be improved under the condition that two adjacent optical sensing pixels are not influenced by each other, and then the size of each fingerprint detection unit can be reduced, and the size of the fingerprint detection device is also reduced.

From the above, according to the technical scheme of the application, through the reasonable design of the plurality of light guide channels corresponding to each micro lens, the optical sensing pixel array 240 can only receive the light signals of the inclination angle, and the inclination light signals of a plurality of angles are converged through a single micro lens, so that the problem that the exposure time of the single-object telecentric micro lens array scheme is too long is solved. In other words, the fingerprint detection unit 20 can not only solve the problem of poor recognition effect of the vertical light signal on the dry finger and the problem of long exposure time of the single-object telecentric microlens array scheme, but also solve the problems of excessive thickness, poor tolerance and excessive size of the fingerprint detection device comprising a plurality of fingerprint detection units.

In the embodiment of the present application, the fingerprint detection device includes a plurality of fingerprint detection units, each of which can receive a plurality of oblique lights in different directions, for example, the fingerprint detection unit 20 shown in fig. 3 to 8 can receive four different oblique lights, and the oblique angle in each direction can be the same or different.

Assuming that only one fingerprint detection unit is included in the under-screen fingerprint detection apparatus, the fingerprint detection unit may be configured to receive oblique light in multiple directions, and in this case, the effective imaging field of view of the single fingerprint detection unit will be offset outward by a certain distance in the vertical direction thereof. For example, fig. 9 shows a schematic view of a field of view of a single fingerprint detection unit, and as shown in fig. 9, the electronic device includes a display screen 310, and a single fingerprint detection unit is included below the display screen 310, and assuming that the single fingerprint detection unit is the fingerprint detection unit 20 in fig. 3 to 8 described above, it can receive four different obliquely directed lights. As shown in fig. 9, since the fingerprint detection unit can receive light in an oblique direction, the size of the upper surface of the fingerprint detection unit (or the field of view of the fingerprint detection unit) is smaller than the area of the effective area of the fingerprint detection area 311 above the display screen 310, that is, the size of the entire fingerprint detection unit is expanded by Δ L towards the edge of the fingerprint detection unit relative to the field of view of the fingerprint detection area 311 on the display screen 310. The fingerprint detection area 311 included in the display screen 310 is used to provide a touch interface for fingerprint identification of a user, and its effective area may also be referred to as a field of view of the fingerprint detection unit in the fingerprint detection area 311, or referred to as a field of view of the fingerprint detection area 311, which refers to a range of effective touch when a finger touches to perform fingerprint identification. It will be appreciated that the extended field of view is proportional to the distance between the upper surface of the screen and the upper surface of the fingerprint detection unit.

Specifically, fig. 10 shows a schematic view of a field range calculation manner of a single fingerprint detection unit according to an embodiment of the present application, and as shown in fig. 10, the size of the entire fingerprint detection unit 20 relative to the field range of the fingerprint detection area 311 on the display screen 310 expands the field of view of the fingerprint detection unit by Δ L, which may be calculated by the following formula (1):

ΔL＝h₁tanθ₁+h₂tanθ₂(1)

wherein, as shown in FIG. 10, h₁Is the thickness of the display screen 310; theta₁The deflection angle at which light travels within the display screen 310; h is₂Is the thickness of the gap between the fingerprint detection unit 20 and the display screen 310; theta₂The angle of deflection of the light propagating in the gap, e.g. the angle theta when air is present in the gap₂Is the angle of deflection of the light propagating in air. Alternatively, the theta₁And theta₂Satisfies the formula n₁sinθ₁＝n₂sinθ₂，n₁Representing the refractive index, n, of the display screen 310₂A refractive index representing a gap between the fingerprint detection unit 20 and the display screen 310, e.g., if the gap is air, the n₂Representing the refractive index of air.

For example, suppose that the fingerprint detection unit receives four different oblique directions of light, each direction having an angle of 40 ° in air, and the display screen 310 is an OLED screen with a thickness of 1.4 mm. At this time, when the fingerprint detection unit 20 is installed below the display screen 310, the field of view expanded by the fingerprint detection unit may be adjusted to Δ L of 0.75mm by adjusting the distance between the fingerprint detection unit 20 and the display screen 310.

In general, the smaller the chip of the fingerprint detection unit, the larger the ratio of the field of view that is spread. For example, assuming that the minimum size of a fingerprint detection unit is 2.3mmx2.3mm, which may be the size of a Complementary Metal Oxide Semiconductor (CMOS) light sensitive area, the light path through the fingerprint detection unit is involved in extending its effective field of view by 3.8mm, and the entire field of view by nearly 2.7 times.

According to the experience of using the fingerprint under the screen, the effective area of the optical fingerprint under the screen is usually greater than or equal to 6mmx6mm, and the recognition effect is better, that is, the effective area of the fingerprint detection area 311 included in the display screen 310 is usually greater than or equal to 6mmx6mm, and the fingerprint detection area 311 is used for providing a touch interface for the user to perform fingerprint recognition. In order to obtain as many visual fields as possible with a small chip area, an embodiment of the present application provides a fingerprint detection device, which realizes a larger visual field by physically splicing a plurality of fingerprint detection units.

Specifically, the fingerprint detection device of the embodiment of the present application includes a plurality of fingerprint detection units, fig. 11 shows a schematic diagram of the electronic device 300 of the embodiment of the present application, as shown in fig. 11, the electronic device 300 includes a display screen 310, the display screen 310 includes a fingerprint detection area 311 for providing a touch interface for a user to perform fingerprint identification, a fingerprint detection device is disposed below the display screen 310, the fingerprint detection device includes a plurality of fingerprint detection units, for example, any one of the plurality of fingerprint detection units may be the fingerprint detection unit 20.

Specifically, the size of each fingerprint detection unit in the plurality of fingerprint detection units and the distance between two adjacent fingerprint detection units are set according to a size parameter, and the size parameter comprises at least one of the following parameters: the field of view range of each fingerprint detection unit (i.e. the total area including the field of view that the fingerprint detection unit can extend), the area of the fingerprint detection area, the thickness of the display screen and the distance from the surface of the light path of each fingerprint detection unit to the upper surface of the display screen.

It should be understood that the structures or sizes of the plurality of fingerprint detection units included in the fingerprint detection device in the embodiment of the present application may be the same or different. Specifically, any one of the fingerprint detection units may be the fingerprint detection unit 20 shown in fig. 3 to 8, but the fingerprint detection units may be the same or different in structure, and may also be the same or different in size. For example, for convenience of manufacturing, the structures and the sizes of the plurality of fingerprint detection units may be all configured to be identical, for example, the plurality of fingerprint detection units may be all configured to be the fingerprint detection units 20 shown in fig. 3 or fig. 7, but the embodiment of the present application is not limited thereto.

In the embodiment of the present application, the plurality of fingerprint detection units included in the fingerprint detection device may be arranged in a matrix of n × m, where n and m are positive integers. The spacing distances of a plurality of fingerprint detection units positioned in the same row in the plurality of fingerprint detection units are equal; and/or the spacing distances of a plurality of fingerprint detection units positioned in the same column in the plurality of fingerprint detection units are equal.

Optionally, the arrangement of the fingerprint detection units according to the embodiment of the present application will be described in detail below with reference to specific embodiments.

Alternatively, as the first embodiment, the number of the plurality of fingerprint detection units included in the fingerprint detection device may be two.

Optionally, the two fingerprint detection units may be arranged side by side left and right, and may also be arranged side by side up and down. For example, fig. 12 shows a schematic diagram of an arrangement manner of two fingerprint detection units according to an embodiment of the present application. As shown in fig. 12, it is assumed here that two rectangular fingerprint detection units are arranged side by side in the left-right direction, wherein each fingerprint detection unit may be the fingerprint detection unit 20 shown in fig. 3 to 8 described above.

Specifically, as shown in fig. 12, where the width of the fingerprint detection unit is denoted as W, the length is denoted as H, and the horizontal distance between two fingerprint detection units is denoted as G, the rectangular box at the periphery of the two fingerprint detection units in fig. 12 may represent the effective range of the fingerprint detection area, which is larger than the area of the fingerprint detection unit. Alternatively, the actual area of the fingerprint detection area may be larger than the effective range thereof, which represents the minimum area that can be used for fingerprint identification, for example, other functional areas may also be disposed in the fingerprint detection area, and the embodiment of the present application is not limited thereto.

It is to be understood that, as shown in fig. 12, depending on the size of the field of view of each fingerprint detection unit on the upper surface of the display screen, in the case where two fingerprint detection units are provided, the size of W, H and G can be set appropriately to meet the requirement of the effective area size of the fingerprint detection area.

Specifically, the dimensional parameters include: in the case that the field of view of each fingerprint detection unit on the upper surface of the display screen extends beyond the edge of each fingerprint detection unit by at least a first value X (i.e. Δ L is greater than or equal to the first value X), and the length of the fingerprint detection area is greater than or equal to a second value Y, and the width of the fingerprint detection area is greater than or equal to a third value Z, then referring to fig. 12, the following parameters may be set correspondingly: the length H of each fingerprint detection unit is greater than or equal to Y-2X, the width W of each fingerprint detection unit is greater than or equal to 0.5Z-2X, and the horizontal distance G between the two fingerprint detection units is less than or equal to 2X.

For example, assume that the dimensional parameters include: the field of view of each fingerprint detection unit on the upper surface of the display screen extends at least 0.75mm (i.e. Δ L is greater than or equal to 0.75mm) beyond the edge of each fingerprint detection unit, and the area of the fingerprint detection area is greater than or equal to 6mm × 6mm, then with reference to fig. 12, the following parameters may be set correspondingly: the length H of each fingerprint detection unit is greater than or equal to 4.5mm, the width W of each fingerprint detection unit is greater than or equal to 1.5mm, and the horizontal distance G between the two fingerprint detection units is less than or equal to 1.5 mm. For example, if the length H of each fingerprint detection unit is set to 6mm, the width W of each fingerprint detection unit is set to 2.3mm, and the horizontal distance G between the two fingerprint detection units is set to 1mm, then the effective field of view or the effective area of the corresponding fingerprint identification area is 7.1mm × 7.5mm according to the above parameter settings.

As another example, assume that the dimensional parameters include: the field of view of each fingerprint detection unit on the upper surface of the display screen extends by at least 0.6mm (i.e. Δ L is greater than or equal to 0.6mm) beyond the edge of each fingerprint detection unit, and the area of the fingerprint detection area is greater than or equal to 6mm × 6mm, then referring to fig. 12, the following parameters may be set correspondingly: the length H of each fingerprint detection unit is greater than or equal to 4.8mm, the width W of each fingerprint detection unit is greater than or equal to 1.8mm, and the horizontal distance G between the two fingerprint detection units is less than or equal to 1.2 mm. For example, if the length H of each fingerprint detection unit is set to 6.5mm, the width W of each fingerprint detection unit is set to 2.6mm, and the horizontal distance G between the two fingerprint detection units is set to 1mm, then the effective field of view or the effective area of the corresponding fingerprint identification area is 7.4mm × 7.7mm according to the above parameter settings.

As another example, assume that the dimensional parameters include: the field of view of each fingerprint detection unit on the upper surface of the display screen extends at least 0.3mm (i.e. Δ L is greater than or equal to 0.3mm) beyond the edge of each fingerprint detection unit, and the area of the fingerprint detection area is greater than or equal to 6mm × 6mm, then with reference to fig. 12, the following parameters may be set correspondingly: the length H of each fingerprint detection unit is greater than or equal to 5.4mm, the width W of each fingerprint detection unit is greater than or equal to 2.4mm, and the horizontal distance G between the two fingerprint detection units is less than or equal to 0.6 mm.

It should be understood that the distance Δ L of the field of view of each fingerprint detection unit on the upper surface of the display screen relative to the edge extension of each fingerprint detection unit can be determined by the parameter h according to equation (1)₁、h₂、θ₁And theta₂The determination is made, and the range of Δ L may be set according to the actual application, for example, 0.6mm or 0.75mm described above may be set, or may also be set to a larger or smaller value, for example, Δ L is generally set to be greater than or equal to 0.3 mm. For example, assume the thickness h of the display screen₁1.4mm, the deflection angle theta of the light ray propagating in the air₂Is 40 deg. by adjusting the vertical distance h from the surface of the fingerprint detection unit to the display screen₂Δ L may be made to reach 0.6mm, or 0.75 mm; as another example, assume that the vertical distance h from the light path surface of each fingerprint detection unit to the upper surface of the display screen₁+h₂1.6mm, the deflection angle theta of the light ray propagating in the air ₂20 deg., and Δ L may be made to reach 0.6 mm.

Therefore, according to the above-mentioned mode of setting up two fingerprint detection units, that is to say the method of two light sensitive zone concatenations, rationally set up W, G and these three parameters of H to satisfy the requirement of the effective area of fingerprint detection area, just can realize low-cost optical fingerprint identification scheme under the screen. According to the splicing method, the data output by the areas of the two fingerprint detection units can be spliced together by a digital image processing algorithm to carry out fingerprint identification.

Optionally, as a second embodiment, the number of the plurality of fingerprint detection units included in the fingerprint detection device may also be four.

Alternatively, the four fingerprint detection units may be arranged in various ways. For example, four fingerprint detection units may be arranged in a row or a column, or four fingerprint detection units may be arranged in a 2 × 2 matrix.

Fig. 13 is a schematic diagram showing an arrangement of four fingerprint detection units according to an embodiment of the present application. As shown in fig. 13, it is assumed that four rectangular fingerprint detection units are arranged in a 2 × 2 matrix, wherein each fingerprint detection unit may be the fingerprint detection unit 20 shown in fig. 3 to 8 described above.

Specifically, as shown in fig. 13, here, the length of each fingerprint detection unit is denoted by H, the width of each fingerprint detection unit is denoted by W, the horizontal distance between two fingerprint detection units adjacent in the horizontal direction is denoted by G1, and the vertical distance between two fingerprint detection units adjacent in the vertical direction is denoted by G2. The rectangular box around the four fingerprint detection units in fig. 13 may represent the effective range of the fingerprint detection area, which is larger than the total area of the fingerprint detection units. Alternatively, the actual area of the fingerprint detection area may be larger than the effective range thereof, which represents the minimum area that can be used for fingerprint identification, for example, other functional areas may also be disposed in the fingerprint detection area, and the embodiment of the present application is not limited thereto.

It is understood that, as shown in fig. 13, in the case where four fingerprint detection units are provided, the size of W, H, G1 and G2 can be set appropriately to meet the requirement of the effective area size of the fingerprint detection area, depending on the size of the field of view of each fingerprint detection unit on the upper surface of the display screen. For example, the size and distance of each fingerprint detection unit can be determined based on the distance of the field of view of each fingerprint detection unit on the upper surface of the display screen relative to the edge of each fingerprint detection unit and the minimum value of the effective area of the fingerprint detection area in the display screen, so as to meet the requirement of the fingerprint detection area.

Specifically, the dimensional parameters include: in the case that the field of view of each fingerprint detection unit on the upper surface of the display screen extends beyond the edge of each fingerprint detection unit by at least a first value X (i.e., Δ L is greater than or equal to the first value X), and the length of the fingerprint detection area is greater than or equal to a second value Y, and the width of the fingerprint detection area is greater than or equal to a third value Z, then with reference to fig. 13, the following parameters may be set correspondingly: the length H of each fingerprint detection unit is greater than or equal to 0.5Y-2X, the width W of each fingerprint detection unit is greater than or equal to 0.5Z-2X, the horizontal distance G1 between two adjacent fingerprint detection units in the horizontal direction is less than or equal to 2X, and the vertical distance G2 between two adjacent fingerprint detection units in the vertical direction is less than or equal to 2X.

For example, assume that the dimensional parameters of the embodiments of the present application include: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.75mm (i.e. Δ L is greater than or equal to 0.75mm) beyond the edge of each fingerprint detection unit, and the area of the fingerprint detection area is greater than or equal to 6mm × 6mm, then with reference to fig. 13, the following parameters may be set correspondingly: the length H of each fingerprint detection unit may be set to be greater than or equal to 1.5mm, the width W of each fingerprint detection unit may be set to be greater than or equal to 1.5mm, the horizontal distance G1 between two fingerprint detection units adjacent in the horizontal direction may be set to be less than or equal to 1.5mm, and the vertical distance G2 between two fingerprint detection units adjacent in the vertical direction may be set to be less than or equal to 1.5 mm.

For example, according to the above-mentioned dimensional parameters, the length H of each fingerprint detection unit can be set to 2.3mm, the width W of each fingerprint detection unit can be set to 2.3mm, the horizontal distance G1 between two fingerprint detection units adjacent in the horizontal direction can be set to 1.2mm, the vertical distance G2 between two fingerprint detection units adjacent in the vertical direction can be set to 1.2mm, and then the effective area of the four-beam eye stitching scheme is (2.3 × 2+1.2+1.5)²＝7.3×7.3(mm²)。

For another example, assume that the dimensional parameters of the embodiments of the present application include: the field of view of each fingerprint detection unit on the upper surface of the display screen extends by at least 0.6mm (i.e. Δ L is greater than or equal to 0.6mm) beyond the edge of each fingerprint detection unit, and the area of the fingerprint detection area is greater than or equal to 6mm × 6mm, then with reference to fig. 13, the following parameters may be set correspondingly: the length H of each fingerprint detection unit may be set to be greater than or equal to 1.8mm, the width W of each fingerprint detection unit may be set to be greater than or equal to 1.8mm, the horizontal distance G1 between two fingerprint detection units adjacent in the horizontal direction may be set to be less than or equal to 1.2mm, and the vertical distance G2 between two fingerprint detection units adjacent in the vertical direction may be set to be less than or equal to 1.2 mm.

Fig. 14 is a schematic diagram showing the arrangement sizes of four fingerprint detection units according to the embodiment of the present application, and as shown in fig. 14, according to the above-mentioned case that the field range of each fingerprint detection unit on the upper surface of the display screen is 0.6mm extending from the edge of each fingerprint detection unit, the length H of each fingerprint detection unit can be set to 2.6mm, the width W of each fingerprint detection unit is set to 2.6mm, the horizontal distance G1 between two adjacent fingerprint detection units in the horizontal direction is set to 1mm, the vertical distance G2 between two adjacent fingerprint detection units in the vertical direction is set to 1mm, and then correspondingly, the effective area of the fingerprint detection area is (2.6 × 2+1+1.2)²＝7.4×7.4(mm²) And the requirement that the area of the fingerprint detection area is greater than or equal to 6mm by 6mm is met.

For another example, assume that the dimensional parameters of the embodiments of the present application include: the field of view of each fingerprint detection unit on the upper surface of the display screen extends at least 0.3mm (i.e. Δ L is greater than or equal to 0.3mm) beyond the edge of each fingerprint detection unit, and the area of the fingerprint detection area is greater than or equal to 6mm × 6mm, then with reference to fig. 13, the following parameters may be set correspondingly: the length H of each fingerprint detection unit may be set to be greater than or equal to 2.4mm, the width W of each fingerprint detection unit may be set to be greater than or equal to 2.4mm, the horizontal distance G1 between two fingerprint detection units adjacent in the horizontal direction may be set to be less than or equal to 0.6mm, and the vertical distance G2 between two fingerprint detection units adjacent in the vertical direction may be set to be less than or equal to 0.6 mm.

It should be understood that, similarly to when two fingerprint detection units are provided, regardless of the arrangement of several fingerprint detection units, the distance Δ L by which the field of view of each fingerprint detection unit on the upper surface of the display screen extends outward with respect to the edge of each fingerprint detection unit can be determined by the parameter h according to formula (1)₁、h₂、θ₁And theta₂The range of Δ L may be set according to practical applications, for example, 0.6mm or 0.75mm may be set, or may also be set to a larger or smaller value, for example, Δ L is usually set to be greater than or equal to 0.3mm, and for brevity, will not be described again.

According to the two embodiments, the fingerprint detection device may include two or four fingerprint detection units by using a splicing manner, and on this basis, other numbers of fingerprint detection units may also be provided, for example, more than 4 fingerprint detection units may also be provided, which is not limited to this embodiment of the present application.

In addition, the splicing scheme of the fingerprint detection unit can be implemented on a single CMOS imaging chip, and can also be implemented by splicing CMOS imaging chips of optical path architectures of a plurality of small-area fingerprint detection units, and both the two can implement low-cost, large-view-field-area and ultrathin optical fingerprints.

In the embodiment of the application, the data output by each fingerprint detection unit can be processed by a digital image reconstruction algorithm. Specifically, image data in the same direction of the induction area of each fingerprint detection unit is subjected to specific pixel shift to obtain the clearest image of the area; the images in the same corresponding area of different fingerprint detection units can be spliced by moving specific pixels to obtain the clearest image. In the splicing process, the problem of different sampling of image data in non-overlapping areas can be solved by using an interpolation mode. Compared with a single-object telecentric micro-lens array scheme, the area of a plurality of fingerprint detection units in the fingerprint identification device of the embodiment of the application is smaller, the obtained data volume is less, and the software resource consumption is less under the same field area. In addition, the space between the AA areas of the fingerprint detection units can be used for laying out the routing, or can be used for placing a driving circuit and a control circuit of a CMOS sensitive unit pixel, so that the area of a chip can be further reduced.

For convenience of explanation, the description will be made by taking as an example a manner in which the optically sensitive pixel array included in one fingerprint detection unit processes an image, and each of the plurality of fingerprint detection units included in the fingerprint detection apparatus may perform image processing in the same manner.

Specifically, for a fingerprint detection unit, the fingerprint detection unit includes an optical sensing pixel array, the optical sensing pixel array includes a plurality of optical sensing pixels, the optical sensing pixels are divided into a plurality of groups of optical sensing pixels, and the same group of optical sensing pixels are used for receiving optical signals in the same direction, that is, the directions of light guide channels through which the optical signals received by the same group of optical sensing pixels pass are the same.

The optical sensing pixel array is divided into a plurality of groups of optical sensing pixels, and the plurality of groups of optical sensing pixels are used for receiving optical signals in a plurality of directions to obtain a plurality of images, and the plurality of images are used for detecting fingerprint information of a finger. For example, each fingerprint detection unit may directly output the plurality of images, or may reconstruct the plurality of images into one image, and the reconstructed image is used for fingerprint recognition.

Optionally, one of the optical sensing pixels in the plurality of sets of optical sensing pixels is configured to receive an optical signal in one of the plurality of directions to obtain one of the plurality of images. For example, as shown in fig. 5, assuming that the photo-sensing pixel array in the fingerprint detection unit can receive light in four directions in total, that is, the fingerprint detection unit includes light guide channels in four directions, the photo-sensing pixel array can be divided into four groups of photo-sensing pixels, where a first group of photo-sensing pixels is used to receive light signals in a first direction, for example, the first group of photo-sensing pixels may include the photo-sensing pixels included in the upper left corner in fig. 5 and convert them into a first group of electrical signals, and the first group of electrical signals is used to form a first image; in analogy, the second group of photo-sensing pixels is configured to receive the light signal in the second direction, for example, the second group of photo-sensing pixels may include the photo-sensing pixels included in the upper right corner in fig. 5 and convert the photo-sensing pixels into a second group of electrical signals, and the second group of electrical signals is configured to form a second image; the third set of photo-sensing pixels is configured to receive the light signal in the third direction, for example, the third set of photo-sensing pixels may include the photo-sensing pixels included in the lower left corner of fig. 5 and convert the light signal into a third set of electrical signals, and the fourth set of photo-sensing pixels is configured to receive the light signal in the fourth direction, for example, the fourth set of photo-sensing pixels may include the photo-sensing pixels included in the lower right corner of fig. 5 and convert the light signal into a fourth set of electrical signals, and the fourth set of electrical signals is configured to form a fourth image.

Optionally, the number of pixels of each group of pixels in the plurality of groups of optically sensitive pixels may be equal or unequal; if the number of the multiple groups of optical sensing pixels is equal, the same arrangement mode can be adopted. For example, as shown in fig. 5, assuming that four optical sensing pixels are correspondingly distributed below each microlens like the second microlens 212, when the optical sensing pixel array is grouped, the optical sensing pixels above and to the left of each microlens may be grouped into the same group, and the optical signals received by the optical sensing pixels of the same group have the same direction; similarly, the total number of the photo-sensing pixels in the four groups of photo-sensing pixels can be divided into four groups, and the photo-sensing pixels in the four groups of photo-sensing pixels are all the same in number and are arranged in the same manner and are all located at the positions corresponding to the upper left corners of the microlenses.

It should be understood that the optical sensing pixel array is divided into a plurality of groups of optical sensing pixels, each optical sensing pixel in each group of optical sensing pixels may correspond to one pixel point in one image, that is, each optical sensing pixel in the optical sensing pixel array corresponds to only one pixel point, so that the corresponding generated image is clearer and the relative calculation amount is larger.

In view of reducing the calculation amount, optionally, for any one of the plurality of sets of photo-sensing pixels, one pixel point may be generated by a plurality of photo-sensing pixels. For example, assuming that the number of the optical sensing pixels included in the plurality of groups of optical sensing pixels is the same, a pixel point can be correspondingly output by a preset number of optical sensing pixels which are continuous at positions in one group of optical sensing pixels, so that the calculation amount can be greatly reduced.

In other words, for any of the consecutive optical sensing pixels for outputting the same pixel point, there may be other optical sensing pixels at a position between any two of the consecutive optical sensing pixels, but the light signal received by the other optical sensing pixels is in a different direction from the light signal received by the consecutive optical sensing pixels, that is, the following optical sensing pixels may not exist at a position between any two of the consecutive optical sensing pixels: the direction of the optical signal received by the optical sensing pixel is the same as the direction of the optical signal received by the plurality of consecutive optical sensing pixels.

For example, taking fig. 5 as an example, assuming that each microlens corresponds to four optically sensitive pixels as the second microlens 212, the optically sensitive pixel at the upper left corner of each microlens belongs to the same group, and for this group of optically sensitive pixels, one or more optically sensitive pixels consecutive to the third optically sensitive pixel 243 may include: among one or more microlenses adjacent to the second microlens 212 (e.g., the first microlens 211 and the third microlens 213 as shown in fig. 3), the optically sensitive pixel corresponding to the upper left corner of each microlens; meanwhile, one or more optically sensitive pixels consecutive to the third optically sensitive pixel 243 may not include: the optically sensitive pixels corresponding to microlenses that are not adjacent to the second microlens 212, for example, do not include optically sensitive pixels corresponding to any microlens that is spaced apart from the second microlens 212 by other microlenses. Also, the third photo-sensing pixel 243 and one or more other photo-sensing pixels consecutive thereto may be used to output a pixel point together.

It should be understood that each fingerprint detection unit may output one or more images in the manner described above, for example, the multiple images may be combined for fingerprint detection provided that the multiple fingerprint detection units each finally output one fingerprint image. Or, if each of the fingerprint detection units outputs a plurality of images, for example, the plurality of images correspond to light signals in a plurality of directions, the fingerprint images with the same light signal in all the images output by the plurality of fingerprint detection units may be merged, for example, image data in the same direction of the sensing area of each fingerprint detection unit is shifted by a specific pixel to obtain the clearest image of the sensing area; the images in the same corresponding area of different fingerprint detection units can be spliced by moving specific pixels to obtain the clearest image.

In addition, the fingerprint detection device of the embodiment of the application can also be used for distinguishing true and false fingerprints in 2D and 3D. Since each fingerprint detection unit can receive images in a plurality of directions, for example, images in four directions can be received. Under the condition that valleys and ridges of the fingerprint are pressed on the upper surface of the OLED screen, when light is received in the oblique direction, linear polarized light is reflected by the positions, located at the valleys, of the upper surface of the OLED screen to penetrate into the mobile phone due to the characteristic of the Brewster angle. When the reflected linearly polarized light is parallel to the mobile phone linear polaroid, the light intensity received by the sensor below is maximum; when the reflected linearly polarized light is vertical to the linear polarizer of the mobile phone screen, the light received by the lower sensor is the weakest. That is, the 3D fingerprint is pressed on the upper surface of the OLED screen, the original data of the images of the electron beam eye and the mobile phone screen linear polaroid in different directions are different, but the difference of the 2D fingerprint is not obvious. Therefore, by distinguishing the original data difference of the light in different directions, the 2D false fingerprint and the 3D fingerprint can be distinguished to some extent.

Therefore, the fingerprint detection device of this application embodiment, including a plurality of fingerprint detecting element, through with the reasonable concatenation of this a plurality of fingerprint detecting element, can realize that big visual field and light receive to one side, and then can reduce actual chip area, reduced the chip cost, reduce software resource consumption, can also promote the imaging effect of dry hand fingerprint.

The embodiment of the application also provides electronic equipment which can comprise a display screen and the fingerprint detection device, wherein the fingerprint detection device is arranged below the display screen to realize optical fingerprint detection under the screen.

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

The display screen may be the display screen described above, such as an OLED display screen or other display screens, and for the description of the display screen, reference may be made to the description of the display screen in the above description, and for brevity, no further description is provided here.

The electronic device may also include at least one processor for processing data output by the plurality of fingerprint detection units. For example, the electronic device may receive the image data output by each fingerprint detection unit through a processor, and for example, may receive the data of each fingerprint detection unit through a Serial Peripheral Interface (SPI), and process the data of the plurality of fingerprint detection units. Or, the electronic device may further receive, through SPI interfaces of the multiple processors, the image data output by each fingerprint detection unit, and after each processor performs processing, the image data are merged by one of the processors.

It should be understood that the specific examples in the embodiments of the present application are for the purpose of promoting a better understanding of the embodiments of the present application 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 present application and the appended claims is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. For example, as used in the examples of this application and the appended claims, the singular forms "a," "an," 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 various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

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

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a fingerprint detection device which characterized in that, is applicable to the below of display screen in order to realize optical fingerprint detection under the screen, the display screen includes fingerprint detection area, fingerprint detection area is used for the finger touch in order to carry out fingerprint detection, fingerprint detection device includes:

a plurality of fingerprint detection units, the size of each fingerprint detection unit in the plurality of fingerprint detection units and the distance between two adjacent fingerprint detection units are set according to size parameters, and the size parameters comprise at least one of the following parameters: the field of view range of each fingerprint detection unit, the area of the fingerprint detection area, the thickness of the display screen and the distance from the surface of the light path of each fingerprint detection unit to the lower surface of the display screen;

wherein each fingerprint detection unit includes:

the micro-lens array is arranged below the display screen and comprises a plurality of micro-lenses;

at least one light blocking layer, which is arranged below the microlens array and is formed with a plurality of light guide channels corresponding to each microlens in the plurality of microlenses, wherein an included angle between each light guide channel in the plurality of light guide channels corresponding to each microlens and an optical axis of each microlens is less than 90 degrees;

the optical sensing pixel array is arranged below the at least one light blocking layer and comprises a plurality of optical sensing pixels, one optical sensing pixel is arranged below each light guide channel in the plurality of light guide channels corresponding to each micro lens, the optical sensing pixel is used for receiving optical signals which are converged by the micro lens and transmitted through the corresponding light guide channel, and the optical signals are used for detecting fingerprint information of a finger.

2. The fingerprint detection apparatus according to claim 1, wherein the plurality of fingerprint detection units are the same size.

3. The fingerprint detection apparatus according to claim 1 or 2, wherein a plurality of fingerprint detection units located in a same row among the plurality of fingerprint detection units are equally spaced; and/or the presence of a gas in the gas,

the spacing distances of a plurality of fingerprint detection units positioned in the same column are equal.

4. The fingerprint detection apparatus according to any one of claims 1 to 3, wherein the number of the plurality of fingerprint detection units is two.

5. The fingerprint sensing device according to claim 4, wherein two fingerprint sensing units are arranged side by side in the left-right direction.

6. The fingerprint sensing apparatus of claim 5, wherein the size parameter comprises: under the condition that the field range of the upper surface of the display screen of each fingerprint detection unit is at least a first value X expanded outside the edge of each fingerprint detection unit, the length of the fingerprint detection area is greater than or equal to a second value Y, and the width of the fingerprint detection area is greater than or equal to a third value Z, the length of each fingerprint detection unit is greater than or equal to Y-2X, the width of each fingerprint detection unit is greater than or equal to 0.5Z-2X, and the horizontal distance between the two fingerprint detection units is less than or equal to 2X.

7. The fingerprint detection apparatus according to any one of claims 1 to 3, wherein the number of the plurality of fingerprint detection units is four.

8. The fingerprint sensing apparatus of claim 7, wherein the four fingerprint sensing units are arranged in a 2x 2 matrix.

9. The fingerprint sensing apparatus of claim 8, wherein the size parameter comprises: under the condition that the field range of the upper surface of the display screen of each fingerprint detection unit is at least a first value X expanded outside the edge of each fingerprint detection unit, the length of each fingerprint detection area is greater than or equal to a second value Y, and the width of each fingerprint detection area is greater than or equal to a third value Z, the length of each fingerprint detection unit is greater than or equal to 0.5Y-2X, the width of each fingerprint detection unit is greater than or equal to 0.5Z-2X, the horizontal distance between two adjacent fingerprint detection units in the horizontal direction is less than or equal to 2X, and the vertical distance between two adjacent fingerprint detection units in the vertical direction is less than or equal to 2X.

10. The fingerprint detection apparatus according to any one of claims 1 to 9,

the bottom of the plurality of light guide channels corresponding to each micro lens respectively extends to the lower part of the plurality of adjacent micro lenses; alternatively, the first and second electrodes may be,

the bottoms of the light guide channels corresponding to each micro lens are positioned below the same micro lens.

11. The fingerprint detection device according to any one of claims 1 to 10, wherein the plurality of light guide channels corresponding to each microlens are distributed centrosymmetrically along the optical axis direction of the same microlens.

12. The fingerprint detection apparatus according to any one of claims 1 to 11, wherein each of the plurality of light guide channels corresponding to each of the microlenses forms a predetermined included angle with a first plane, so that a plurality of optically sensitive pixels disposed below each of the microlenses are respectively configured to receive the light signals converged by the microlenses and transmitted through the corresponding light guide channels, wherein the first plane is a plane parallel to the display screen.

13. The fingerprint sensing device of claim 12, wherein the predetermined included angle is in a range of 15 degrees to 60 degrees.

14. The fingerprint detection apparatus according to claim 12 or 13, wherein the projection of the plurality of light guide channels corresponding to each microlens on the first plane is symmetrically distributed with respect to the projection center of the optical axis of the same microlens on the first plane.

15. The fingerprint detection apparatus according to any one of claims 12 to 14, wherein the array of optical sensing pixels includes a plurality of sets of optical sensing pixels, the optical sensing pixels in the same set of optical sensing pixels have the same direction of the light guide channel through which the optical signals pass, the plurality of sets of optical sensing pixels are configured to receive the optical signals in a plurality of directions to obtain a plurality of images, and the plurality of images are configured to detect fingerprint information of a finger.

16. The fingerprint sensing device of claim 15, wherein one of the plurality of sets of optically sensitive pixels is configured to receive the optical signal in one of the plurality of directions to obtain one of the plurality of images.

17. The fingerprint sensing device of claim 16, wherein each of the plurality of sets of pixels has the same number of pixels and are arranged in the same manner.

18. The fingerprint sensing device of claim 16 or 17, wherein one of the plurality of sets of optically sensitive pixels corresponds to a pixel in an image.

19. The fingerprint sensing apparatus of claim 16 or 17, wherein consecutive optical sensing pixels in a group of optical sensing pixels in the plurality of groups of optical sensing pixels correspond to a pixel in an image.

20. The fingerprint detection device according to any one of claims 1 to 19, wherein the distribution of the plurality of optically sensitive pixels under each microlens is rectangular or diamond-shaped.

21. The fingerprint detection device according to any one of claims 1 to 20, wherein the at least one light blocking layer is a plurality of light blocking layers, and at least one opening corresponding to each microlens is disposed in different light blocking layers to form a plurality of light guide channels corresponding to each microlens.

22. The fingerprint sensing device of claim 21, wherein the number of openings corresponding to the same microlens in different light blocking layers increases from top to bottom.

23. The fingerprint sensing device of claim 21 or 22, wherein the apertures of the openings corresponding to the same microlens in different light blocking layers decrease sequentially from top to bottom.

24. The fingerprint detection device according to any one of claims 21 to 23, wherein a plurality of openings corresponding to each microlens are disposed in a bottom light-blocking layer of the plurality of light-blocking layers, and a plurality of light guide channels corresponding to each microlens respectively pass through a plurality of openings corresponding to a same microlens in the bottom light-blocking layer.

25. The fingerprint detection device according to any one of claims 21 to 24, wherein an opening is provided on the optical axis of each microlens in the top light-blocking layer, and the plurality of light guide channels corresponding to each microlens pass through the opening corresponding to the same microlens in the top light-blocking layer.

26. The fingerprint detection device according to any one of claims 21 to 25, wherein the non-bottom light-blocking layer of the plurality of light-blocking layers is provided with an opening at a position intermediate the back focal points of two adjacent microlenses of the plurality of microlenses, and the two light guide channels of the two adjacent microlenses each pass through the openings of the two adjacent microlenses of the non-bottom light-blocking layer, so that the bottom portions of the plurality of light guide channels of each microlens extend below the adjacent microlenses, respectively.

27. The fingerprint detection device according to any one of claims 1 to 20, wherein the at least one light blocking layer comprises only one light blocking layer, and the plurality of light guide channels are a plurality of inclined through holes corresponding to the same microlens in the one light blocking layer.

28. The fingerprint detection device according to claim 27, wherein the thickness of the one light blocking layer is greater than a preset threshold value, so that the plurality of optically sensitive pixels disposed below each of the microlenses are respectively configured to receive the optical signals collected by the microlenses and transmitted through the corresponding light guide channels.

29. The fingerprint detection apparatus according to any one of claims 1 to 28, wherein each fingerprint detection unit further comprises:

a transparent dielectric layer disposed in at least one of the following positions:

between the microlens array and the at least one light blocking layer,

between the at least one light-blocking layer, and

the at least one light blocking layer and the optically sensitive pixel array.

30. The fingerprint detection apparatus of any one of claims 1 to 29, wherein the at least one light blocking layer is integrally disposed with the microlens array, or the at least one light blocking layer is integrally disposed with the optically sensitive pixel array.

31. The fingerprint detection apparatus according to any one of claims 1 to 30, wherein each microlens satisfies at least one of the following conditions:

the projection of the light-gathering surface of the micro lens on a plane vertical to the optical axis of the micro lens is rectangular or circular;

the light-gathering surface of the micro lens is an aspheric surface;

the curvatures in all directions of the light-gathering surfaces of the micro lenses are the same;

the micro lens comprises at least one lens; and

the focal length range of the micro lens is 10um-2 mm.

32. The fingerprint detection apparatus of any one of claims 1 to 31, wherein the microlens array satisfies at least one of the following conditions:

the micro lens array is arranged in a polygon shape; and

the duty cycle of the microlens array ranges from 100% to 50%.

33. The fingerprint sensing device of any one of claims 1 to 32, wherein a period of the microlens array is not equal to a period of the optically sensitive pixel array, and wherein the period of the microlens array is a rational number times the period of the optically sensitive pixel array.

34. The fingerprint detection apparatus of any one of claims 1 to 33, wherein the distance between the fingerprint detection apparatus and the display screen is 20um-3000 um.

35. The fingerprint detection apparatus according to any one of claims 1 to 34, wherein each fingerprint detection unit further comprises:

a filter layer disposed in at least one of the following positions:

above the microlens array, and

the micro lens array and the optical sensing pixel array.

36. An electronic device, comprising:

a display screen; and

the fingerprint detection device according to any one of claims 1 to 35.

37. The electronic device of claim 36, wherein the display screen includes a fingerprint detection area configured to provide a touch interface for a finger.