CN113569642A

CN113569642A - Optical sensing device and electronic equipment

Info

Publication number: CN113569642A
Application number: CN202110718379.XA
Authority: CN
Inventors: 张东虎
Original assignee: Shenzhen Fushi Technology Co Ltd
Current assignee: Shenzhen Fushi Technology Co Ltd
Priority date: 2021-06-28
Filing date: 2021-06-28
Publication date: 2021-10-29

Abstract

The present application provides an optical sensing device, comprising: the light sensing part is provided with a sensing array and a medium layer arranged above the sensing array, a light blocking layer used for blocking light beams is arranged in the medium layer, and a plurality of light through holes corresponding to the sensing units are formed in the light blocking layer; the light guide part is positioned above the light sensing part and used for guiding light beams to the light sensing part, the light guide part comprises a lens layer used for converging the light beams, the lens layer comprises a plurality of lens units, each lens unit is correspondingly arranged with a light through hole in the light blocking layer and a sensing unit below the light through hole, and the light beams within a preset angle range can penetrate through the light through hole corresponding to the lens unit after being converged by the lens units and are received by the light sensing unit corresponding to the lens unit below the light through hole. Thereby, the thickness of the optical sensing device can be reduced, and the sensing accuracy of the optical sensing device can be improved.

Description

Optical sensing device and electronic equipment

Technical Field

The present application belongs to the field of information technology, and in particular, to an optical sensing device and an electronic apparatus.

Background

With the increasing attention paid by people to the biometric identification technology, especially the full screen carrying under-screen fingerprint identification technology in electronic equipment becomes an industry development trend and a hotspot. Capacitive fingerprint identification is difficult to be applied to underscreen fingerprint identification due to the limitation of penetrating power and the like, and the underscreen fingerprint identification is generally realized by using an optical fingerprint identification technology in the prior art.

However, in the existing optical fingerprint identification technology, problems such as optical crosstalk and the like often occur between different sensing units for sensing reflected light signals carrying fingerprint information, so that sensing accuracy is reduced to affect fingerprint identification effect.

Disclosure of Invention

The application provides an optical sensing device and an electronic device, which have smaller thickness and can effectively improve sensing precision.

In a first aspect, the present application provides an optical sensing device comprising a light sensing portion and a light guide portion. The light sensing part comprises a sensing array and a dielectric layer arranged above the sensing array. The sensing array comprises a plurality of sensing units for receiving the light beams for sensing. The sensing unit is arranged in the medium layer, the medium layer is internally provided with a light blocking layer used for blocking light beams, and the light blocking layer is provided with a plurality of light through holes corresponding to the sensing units. The light guide portion is located above the light sensing portion and used for guiding a light beam to the light sensing portion. The light guide includes a lens layer for converging a light beam, the lens layer including a plurality of lens units. Each lens unit is arranged corresponding to the light through hole in the light blocking layer and the sensing unit below the light through hole, and light beams in a preset angle range can penetrate through the light through hole corresponding to the lens unit after being converged by the lens unit and then are received by the photosensitive unit below the light through hole corresponding to the lens unit. (the inventive subject matter is not a claim, does not write its characteristics, and does not require a comma to the tail, and is adapted to adapt a language to conform to the language of a common narrative rather than the language in which the claim is stylized)

In some embodiments, the light guide further includes a substrate, the lens layer being positioned above the substrate, the substrate having an upper surface and a lower surface opposite the upper surface.

In some embodiments, the light guide further comprises one or more filter layers for filtering light outside the target wavelength band, the filter layers being located below the lens layer, the filter layers being disposed on the upper and/or lower surface of the substrate.

In some embodiments, the light guide portion further includes one or more light shielding layers below the lens layer for shielding light beams, the light shielding layers being opened with a plurality of openings through which the light beams can be transmitted below the light shielding layers, the light shielding layers being disposed on filter layers provided on the upper surface and/or the lower surface of the substrate.

In some embodiments, the openings of each light shielding layer correspond to each lens unit, the light through hole on the light shielding layer, and the sensing unit, and the light beam within the preset angle range is converged by the lens unit and then passes through the opening and the light through hole corresponding to the lens unit to reach the sensing unit corresponding to the lens unit.

In some embodiments, the optical centers of the lens units, the centers of the corresponding openings on the light shielding layer, and the centers of the corresponding light through holes on the light blocking layer are collinear.

In certain embodiments, the substrate is a transparent glass substrate or a transparent resin substrate.

In some embodiments, the lens unit, the light-passing hole corresponding to the lens unit, and the photosensitive unit corresponding to the lens unit are aligned in a vertical direction, so that a light beam in an approximately vertical direction can be received by the photosensitive unit corresponding to the lens unit below through the light-passing hole corresponding to the lens unit after being converged by the lens unit; or

The lens unit, the light through hole corresponding to the lens unit and the photosensitive unit corresponding to the lens unit are aligned along a preset inclination angle, so that light rays along the preset inclination angle direction can penetrate through the light through hole corresponding to the lens unit to be received by the photosensitive unit corresponding to the lens unit below the light through hole after being converged by the lens unit, wherein the inclination angle refers to an angle deviating from the vertical direction

In some embodiments, the light blocking layer includes a metal layer and/or other light-impermeable components for forming circuitry within the dielectric layer.

In a second aspect, the present application provides an electronic device comprising a display screen and the optical sensing apparatus of any of the above embodiments. The optical sensing device is arranged below the display screen. The display screen is used for displaying pictures. The optical sensing device is used for receiving the light beam returned by the finger of the user through the display screen so as to sense the corresponding fingerprint information.

In some embodiments, the display screen has a detection area on its outer surface for contact with a finger for collecting fingerprint information. Each lens unit has a corresponding target detection area in the detection area, and a part in a preset angle range in a light beam returning from the target detection area is converged to a corresponding sensing unit below through the lens unit to be received.

In some embodiments, the target detection areas corresponding to adjacent lens units are partially overlapped; or the target detection areas corresponding to the adjacent lens units are connected; or the target detection areas corresponding to the adjacent lens units are separated by a preset distance.

The beneficial effect of this application: based on the above technical scheme, the light guide portion in the optical sensing device may be provided with a plurality of lens units for converging the light beam, and the light sensing portion may be formed with a light blocking layer for blocking the light beam and a sensing array disposed below the light blocking layer and including a plurality of sensing units, the light blocking layer is provided with a plurality of light passing holes, and each lens unit may be disposed corresponding to the light passing hole in the light blocking layer and the sensing unit below the light passing hole. In this case, the light guide portion may converge and guide the light beam to the light sensing portion instead of the relatively thick lens module, thereby reducing the thickness of the optical sensing device. In addition, the light beams can penetrate through the light through holes and are transmitted to the corresponding sensing units below, so that optical crosstalk between adjacent sensing units can be effectively reduced, and the sensing precision of the optical sensing device can be improved.

Drawings

Fig. 1 is a diagram showing a structural example of an electronic apparatus to which an example of the present disclosure relates.

Fig. 2 is a block diagram showing a structure of an optical sensing device according to an example of the present disclosure.

Fig. 3 is a schematic structural diagram illustrating an application of an optical sensing device according to an example of the present disclosure to an electronic device.

Fig. 4A to 4D are schematic views each showing a structure of a light guide portion according to a different example of the present disclosure.

Fig. 5 is a schematic structural view illustrating a light sensing part according to an example of the present disclosure.

Fig. 6 is a schematic diagram illustrating the formation of an optical sensing device according to an example of the present disclosure.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. In the description of the present application, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any order or number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In the description of the present application, it should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; either mechanically or electrically or in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship or combination of two or more elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The following disclosure provides many different embodiments, or examples, for implementing different features of the application. In order to simplify the disclosure of the present application, only the components and settings of a specific example are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repeat use is intended to provide a simplified and clear description of the present application and may not in itself dictate a particular relationship between the various embodiments and/or configurations discussed. In addition, the various specific processes and materials provided in the following description of the present application are only examples of implementing the technical solutions of the present application, but one of ordinary skill in the art should recognize that the technical solutions of the present application can also be implemented by other processes and/or other materials not described below.

Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject technology can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the focus of the application.

Fig. 1 is a diagram showing a structural example of an electronic apparatus 1 to which an example of the present disclosure relates. Fig. 2 is a block diagram illustrating the structure of the optical sensing device 10 according to an example of the present disclosure. Fig. 3 is a schematic structural diagram illustrating an application of the optical sensing device 10 according to an example of the present disclosure to the electronic apparatus 1.

The present disclosure provides an optical sensing device 10. In the embodiments to which the present disclosure relates, the optical sensing device 10 may be applied to the electronic apparatus 1 (see fig. 1). In some examples, the optical sensing device 10 may be used to perform biometric information sensing or the like. Examples of the biometric information include, but are not limited to, fingerprint information, palm print information, and other texture information, or blood oxygen information, heartbeat information, pulse information, and other biological information. Examples of the present disclosure are not limited thereto, and in some examples, the optical sensing device 10 may be used to perform other information sensing, for example, to perform depth information sensing, proximity sensing, and the like. In the present application, the optical sensing device 10 is mainly used to perform the sensing of the biometric information.

For example, referring to fig. 1 and 3, the electronic device 1 may comprise an optical sensing arrangement 10 and a display screen 20. The optical sensing device 10 may be disposed below the display screen 20. The display screen 20 may be used to display a picture, among other things. The optical sensing device 10 may receive the light beam returned via the external object 30 through the display screen 20. It is understood that the light beam returning through the external object 30 may be a light beam reflected by the external object 30, a light beam entering the inside of the external object 30 and then returning by being transmitted from the surface of the external object 30, or a light beam returning through the external object 30 in other manners, which is not limited in the present invention. The optical sensing device 10 may convert the received light beam into a corresponding electrical signal for corresponding information sensing (e.g., fingerprint imaging and recognition), and the like.

In some examples, referring to fig. 2 and 3, the optical sensing device 10 may include a light guide 110 and a light sensing portion 120. In some examples, referring to fig. 3, the light guide 110 may be disposed above the light sensing part 120. In this case, the light guide part 110 may guide the light beam returned via the external object 30 to the light sensing part 120. The light sensing part 120 may perform corresponding information sensing based on the received light beam, and the like. In some examples, the light sensing portion 120 may be packaged with the light guide 110. Optionally, in some examples, the optical sensing device 10 may include a light guide 110, a light sensing portion 120, and a connection layer 115, where the light guide 110 is connected with the light sensing portion 120 through the connection layer 115. It is understood that the connection layer 115 may transmit a light beam, and the light beam returned through the external object 30 is guided by the light guide 110 and then received by the light sensing part 120 through the connection layer 115. In some examples, the external object 30 may be a finger of a user, and the optical sensing device 10 performs fingerprint information sensing based on the received return beam.

In some examples, referring to fig. 3, the outer surface 20a of the display screen 20 may have a detection area Y for acquiring biological information. For example, when the user needs to perform fingerprint authentication on the electronic device 1, the user presses a finger on the detection area Y located on the outer surface 20a of the display screen 20 to perform fingerprint input. Each lens unit 111a may have a corresponding target detection area M in the detection area Y. That is, a portion of the light beam returning at the target detection area M within a preset angle range may be converged to the corresponding sensing unit 121a therebelow by the lens unit 111a for reception (see fig. 3). The target detection area Y corresponding to the lens unit 111a can be defined as the size of the object plane covered by the lens unit 111 a. In some examples, the target detection regions Y corresponding to the respective adjacent lens units 111a may partially overlap with each other. In other examples, the target detection regions Y of the adjacent lens units 111a may be connected or separated by a preset distance.

In some examples, the target detection regions Y may be disposed directly above the respective corresponding lens units 111 a. For example, the object detection area Y corresponding to the lens unit 111a may be disposed in the orthographic projection of the lens unit 111a on the outer surface 20a of the display screen 20, or the orthographic projection of the object detection area Y corresponding to the lens unit 111a on the lens layer 111 may cover the area where the lens unit 111a is located. The lens unit 111a converges the light beam returning from the corresponding target detection area Y in an approximately vertical direction, which may refer to a normal direction of the outer surface 20a of the display screen 20 or a direction in which an angular deviation from the normal direction of the outer surface 20a of the display screen 20 is less than or equal to a target angle, to a corresponding sensing unit 121a (see fig. 3 and 6) on the light sensing part 120 below. It will be appreciated that in some examples, an approximately vertical direction may also refer to a normal direction of a photosurface of sensing array 122 or a direction that is located at an angular deviation from the normal direction of the photosurface of sensing array 122 that is less than or equal to a target angle.

In other examples, referring to fig. 4B, the target detection areas Y may also be disposed obliquely above the respective corresponding lens units 111a without being directly opposite to the respective corresponding lens units 111 a. That is, a portion of the light beam returning from the target detection region Y along a predetermined inclination angle is converged to the corresponding sensing unit 121a of the underlying light sensing part 115 through the lens unit 111a (see fig. 3 and 4). Alternatively, the preset inclination angle may be smaller than 90 degrees, for example: 30 degrees, 35 degrees, 40 degrees, 45 degrees, 55 degrees, 60 degrees, or the like. The preset inclination angle refers to an angle deviating from the vertical direction.

In some examples, the size of the object plane covered by the lens cell 111a may be no greater than 80 μm by 80 μm. Thereby, the sensing accuracy of the optical sensing device 10 can be improved. In other examples, the size of the object plane covered by the lens cell 111a may be greater than 80 μm by 80 μm.

Fig. 4A to 4D are schematic views each showing a structure of a light guide section 110 according to a different example of the present disclosure.

In some examples, referring to fig. 4A, light guide 110 may include a lens layer 111. In some examples, the lens layer 111 may include one or more lens cells 111 a. In some examples, the lens unit 111a may be a convex lens. In some examples, the lens unit 111a may employ an aspherical lens or a spherical lens. In some examples, the lens unit 111a is a microlens, and the plurality of lens units 111a of the lens layer 111 may be a microlens array arranged in an array. In some examples, referring to fig. 4A, the lens unit 111a may include a curved surface. Alternatively, the curved surface of the lens unit 111a may be an outwardly convex surface, and the lens unit 111a may converge the light beam returned via the external object 30 to the light sensing part 120 for reception through the curved surface. Therefore, the light guide portion 110 including the lens layer 111 may be disposed above the light sensing portion 120 instead of a relatively thick lens module to condense the light beam returning through the external object 30, which can reduce the thickness of the optical sensing device 10.

In some examples, each lens unit 111a may correspond to one or more sensing units 121a in the light sensing part 120 (described later in detail). In this case, the lens unit 111a may condense the light beam so that the light beam is received by the corresponding sensing unit 121 a. This can effectively improve the sensing accuracy.

In some examples, the plurality of lens units 111a within the lens layer 111 may be distributed in an array. In some examples, each lens unit 111a may have an optical center. In some examples, the propagation direction of any light passing through the optical center of the lens unit 111a may remain unchanged. For example, referring to fig. 4A, the lens unit 111a₁May have a light center G₁. Lens unit 111a₂May have a light center G₂。

In some examples, the spacing between the optical centers of two adjacent lens units 111a may be referred to as a pitch LP. In some examples, the pitch LP between adjacent two lens units 111a may be not greater than 100 micrometers (μm). For example, referring to fig. 4A, the lens unit 111a₁The optical center may be optical center G₁Lens unit 111a₂The optical center may be optical center G₂Lens unit 111a₁And a lens unit 111a₂Two lenses adjacent to each other. Optical center G₁And the optical center G₂The pitch therebetween (i.e., the pitch LP) may be not greater than 100 μm. Wherein, the optical center G₁And the optical center G₂The pitch therebetween may be 10 μm, 20 μm, 30 μm, 40 μm, 45 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, or the like. Thereby, the sensing accuracy of the optical sensing device 10 can be improved.

In some examples, referring to fig. 4A, the diameter D of the lens unit 111a may not be greater than the pitch LP. In some examples, the diameter D of the lens unit 111a may be not greater than 100 μm. For example, the diameter D of the lens unit 111a may be 10 μm, 20 μm, 30 μm, 40 μm, 45 μm, 50 μm, 60 μm, 70 μm, or 80 μm, 90 μm, or 100 μm.

In some examples, referring to fig. 4A, the rise H of the lens unit 111a may be not more than 30 μm. For example, the rise H of the lens unit 111a may be 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, or the like. In some examples, the radius of curvature of the lens unit 111a may be not greater than 80 μm. For example, the radius of curvature of the lens unit 111a may be 10 μm, 20 μm, 30 μm, 40 μm, 45 μm, 50 μm, 60 μm, 70 μm, 80 μm, or the like. Thereby, the thickness of the optical sensing device 10 can be effectively reduced.

In some examples, the lens layer 111 may be formed of a transparent material. For example, the transparent material may be a transparent acrylic, a transparent glass, or a UV glue (i.e., shadowless glue) material, etc. In some examples, the lens unit 111a may be formed by using an imprinting process on the lens layer 111. Examples of the present disclosure are not limited thereto, and the lens layer 111 (or the lens unit 111a) may also be formed through other processes. For example, the lens unit 111a may be formed by performing photolithography, reflow, screen printing, or the like on a material for forming the lens layer 111, thereby obtaining the lens layer 111.

In some examples, referring to fig. 4A, light guide 110 may include a substrate 112. In some examples, the substrate 112 may have an upper surface 112a and a lower surface 112b opposite the upper surface 112 a. In some examples, the upper surface 112a and the lower surface 112b of the substrate 112 may be disposed in a direction parallel to the outer surface 20a of the display screen 20. In some examples, the lower surface 112b may be closer to the light sensing portion 120 than the upper surface 112 a.

In some examples, the lens layer 111 may be located over the substrate 112. For example, the lens layer 111 may be formed on the upper surface 112a of the substrate 112. In some examples, the substrate 112 may have a certain hardness. In this case, it is possible to provide the optical sensing device 10 with a certain strength to suppress deformation or the like of the optical sensing device 10. In some examples, the substrate 112 may be transparent. For example, the substrate 112 may be a transparent glass substrate or a transparent resin substrate.

In some examples, referring to fig. 4A, light guide 110 may include a filter layer 113. In some examples, filter layer 113 may have a filtering effect. In some examples, filter layer 113 may be used to filter light outside of the target wavelength band. That is, when the light beam is irradiated to the filter layer 113, light having a target wavelength band may pass through the filter layer 113, and light outside the target wavelength band may be filtered (e.g., blocked or absorbed, etc.) by the filter layer 113. For example, the filter layer 113 may be an infrared cut filter. Thereby, the influence of the ambient light can be reduced to improve the sensing accuracy of the optical sensing device 10.

In some examples, the filter layer 113 may be disposed over the lens layer 111. For example, the filter layer 113 may be provided in a gap between the lens layer 111 and the display screen 20, or the filter layer 113 may be attached on a curved surface of the lens unit 111a, or the filter layer 113 may be attached on a lower surface of the display screen 20 opposite to the outer surface 20 a.

Additionally, in some examples, the filter layer 113 may be located below the lens layer 111. In some examples, the filter layer 113 may be in contact with the lens layer 111, and the lens layer 111 may be disposed on the filter layer 113. In some examples, filter layer 113 may be disposed on substrate 112. For example, the filter layer 113 may be disposed on the upper surface 112a of the substrate 112. That is, the filter layer 113 may be attached to the upper surface 112a of the substrate 112. Alternatively, the filter layer 113 may be disposed on the lower surface 112b of the substrate 112. That is, the filter layer 113 may be attached to the lower surface 112b of the substrate 112.

In addition, in other embodiments, the filter layer 113 may be disposed at the light sensing part 120. I.e. the light sensing part 120 may comprise a filter layer 113. For example, the filter layer 113 may be disposed on the upper surface 122a of the light sensing part 120 near the light guide part 110. Or the filter layer 113 may be disposed on the photosensitive surface of the sensing array 121 for receiving the light beams.

In some examples, the optical sensing device 10 may be arranged with one or more filter layers 113. In some examples, the multiple filtering layers 113 may be disposed at different locations of the optical sensing device 10, respectively. For example, referring to fig. 4A, the optical sensing device 10 may be provided with two filter layers 113, a first filter layer 113A and a second filter layer 113B, respectively. First and second filter layers 113A and 113B may be disposed on upper and lower surfaces 112a and 112B of substrate 112, respectively.

In some examples, the filter layer 113 may be formed by, for example, a distillation process or coating, etc.

However, examples of the disclosure are not limited thereto, and in some examples, the material of the lens layer 111 or the substrate 112 may be doped with a filtering material (or filtering material), so that the lens layer 111 or the substrate 112 itself has a filtering function. In this case, the lens layer 111 or the substrate 112 may filter light out of a target wavelength band. In other examples, the internal structure of the light sensing part 120 (e.g., the dielectric layer 122 of the light sensing part 120 in fig. 6) may be doped with a filtering material, so that the light sensing part 120 itself has a filtering function. In this case, it is possible to effectively reduce the influence of ambient light, and to reduce the thickness of the optical sensing device 10.

In some examples, referring to fig. 4A, the light guide 110 may include a light shielding layer 114. In some examples, the light shielding layer 114 may be made of a material with poor light transmittance, such as a non-transparent material or a light absorbing material. For example, the light shielding layer 114 may be made of an opaque resin material or other non-transparent material. In this case, the light shielding layer 114 may serve to shield the light beam to inhibit the light beam from passing through the light shielding layer 114.

In some examples, the light shielding layer 114 may be located above the sensing array 112 (see fig. 3). In some examples, the light shielding layer 114 is located on a side of the lens layer 111 close to the light sensing portion 120, and the light shielding layer 114 may be provided with an opening 114a corresponding to the lens unit 111 a. The light beams converged by the lens unit 111a are guided by the opening 114a corresponding to the lens unit 111a on the light shielding layer 114 and then received by the light sensing portion 120 below the light shielding layer 114. In this case, the opening 114a of the light shielding layer 114 corresponds to a diaphragm, which cooperates with the corresponding lens unit 111a to form a sensing optical path for guiding the light beam to propagate along a preset angular range. Part of the light beams (for example, the light beam L in fig. 3) within the preset angle range in the light beams returning from the external object 30 can pass through the corresponding opening 114a after being converged by the lens unit 111a, and reach the sensing unit 121a corresponding to the lens unit 111a, and part of the light beams outside the preset angle range (for example, the light beam S originally directed to the non-corresponding sensing unit 121a beside in fig. 3) is shielded by the light shielding layer 114, where the preset angle range may refer to an angle range between the light beams and a normal direction of the outer surface 20a of the display screen 20, so that the light beams returning within the preset angle range can be sensed, and light crosstalk caused by stray light returning from other angles is effectively suppressed, and the sensing accuracy of the optical sensing device 10 is improved.

In some examples, referring to fig. 3 and 4A, the opening 114A on the light shielding layer 114 is used to guide the light beam returning in the approximately vertical direction to be transmitted to the corresponding sensing unit 121 a. The openings 114a in the light-shielding layer 114 and the lens units 111a may be aligned in a direction perpendicular to the outer surface 20a of the display screen 20. Specifically, a line connecting the optical center of the lens unit 111a and the center of the corresponding opening 114a may be perpendicular to the outer surface 20a of the display screen 20. That is, a line connecting the optical center of the lens unit 111a and the center of the corresponding aperture 114a may be along the normal direction of the outer surface 20 a. In this case, the light beams returning in the approximately vertical direction may be condensed by the lens units 111a and may pass through the corresponding apertures 114a to be transmitted to the lower side of the light shielding layer 114. Here, the approximately vertical direction may refer to a normal direction of the outer surface 20a of the display screen 20 or a direction located at an angular deviation from the normal direction of the outer surface 20a of the display screen 20 less than or equal to a target angle. That is, the light beams having the target angle with the normal line of the outer surface 20a may also pass through the corresponding openings 114a after being converged by the lens units 111a, and reach the sensing units 121a under the light shielding layer 114. In some examples, the target angle may vary from 0 to 10. For example, the target angle between the returning light beam in the approximately vertical direction and the normal to the outer surface 20a may be no greater than 0 °, 2 °, 3 °, 4 °, 5 °, 6 °, 7 °, 8 °, 9 °, 10 °, or the like.

In other examples, referring to fig. 4B, the openings 114a on the light shielding layer 114 may also be used to guide the light beams returning from the normal direction of the outer surface 20a of the display screen 20 by a preset inclination angle θ to the corresponding sensing units 121 a. A line connecting the optical center of the lens unit 111a and the center of the corresponding opening 114a may have a predetermined angle with respect to the normal of the outer surface 20 a. For example, the preset included angle may be equal to the preset inclination angle θ. The embodiment of the invention does not limit the preset inclination angle theta. For example, the preset inclination angle θ may be varied from 0 ° to 90 °. Specifically, the preset inclination angle θ may be 5 °, 10 °, 15 °, 20 °, 25 °, 30 °, 35 °, 40 °, 45 °, 50 °, 55 °, 60 °, 70 °, 80 °, or 90 °, or the like. In some examples, referring to fig. 4B, the light beam entering the lens unit 111a at the preset inclination angle θ can be converged by the lens unit 111a and may reach the light sensing part 120 through the opening hole 114 a. In some examples, light beams at other angles than the predetermined tilt angle θ may be blocked by the light shielding layer 114. This can effectively suppress crosstalk of light, and can improve the sensing accuracy of the optical sensing device 10. However, examples of the present disclosure are not limited thereto, and in some examples, if an inclined angle between a light beam entering the lens unit 111a and a normal of the outer surface 20a is not much different from the preset inclined angle θ, the light beam may pass through the corresponding opening 114a to reach a lower side of the light shielding layer 114 after being converged by the lens unit 111 a. For example, if the inclination angle of the light beam entering the lens unit 111a is different from the preset inclination angle θ by a target angle, the light beam may be converged by the lens unit 111a and then pass through the corresponding opening 114a to reach the lower side of the light shielding layer 114.

In some examples, the optical sensing device 10 may include one or more light shielding layers 114. In some examples, each layer of light-shielding layer 114 may be located at a different position (described later in detail) within the light guide 110, respectively. In some examples, each of the light-shielding layers 114 has an opening 114a formed thereon corresponding to each of the lens units 111 a. In this case, the light beam converged by the lens unit 111a may pass through the opening 114a of the light shielding layer 114 corresponding to the lens unit 111a to guide the light beam to the light sensing portion 120 below the light shielding layer 114. In some examples, referring to fig. 4A, the centers of the openings 114A in each layer of the light-shielding layer 114 may be collinear with the optical centers of the corresponding lens units 111 a.

In some examples, the light shielding layer 114 may be located between the lens layer 111 and the sensing array 121. For example, referring to fig. 4C, the first light-shielding layer 114A may be disposed on a surface of the first filter layer 113A located between the lens layer 111 and the substrate 112 near the lens layer 111. Alternatively, the light-shielding layer 114 may be located below the substrate 112. For example, referring to fig. 4D, the second light shielding layer 114B may be disposed below the substrate 112 in the vicinity of the lower surface of the light sensing part 120 by the second filter layer 113B.

In the embodiment related to the present disclosure, specifically illustrated by taking fig. 4A and 4B as an example, the light guide portion 110 may have several light shielding layers 114. The plurality of light-shielding layers 114 may include a first light-shielding layer 114A and a second light-shielding layer 114B. The first light-shielding layer 114A may be disposed on the first filter layer 113A between the lens layer 111 and the substrate 112. The second light shielding layer 114B may be disposed below the substrate 112 with the second filter layer 113B near a lower surface of the light sensing part 120. The centers of the openings of the first light-shielding layer 114A and the second light-shielding layer 114B may be collinear with the optical centers of the corresponding lens units 111 a. For example, referring to fig. 4B, the centers a1 of the openings of the first light-shielding layer 114A, the centers a2 of the openings of the second light-shielding layer 114B may be collinear with the optical centers G of the corresponding lens cells 111 a.

In other embodiments, referring to fig. 4C and 4D, the light guide 110 may have a light shielding layer 114. In the example shown in fig. 4C, compared to fig. 4A, the light guide 110 shown in fig. 4C may remove the second light shielding layer 114B, leaving the first light shielding layer 114A. In the example shown in fig. 4D, compared to fig. 4A, the light guide 110 shown in fig. 4D may remove the first light shielding layer 114A, leaving the second light shielding layer 114B.

Examples of the present disclosure are not limited thereto, and in some examples, the light shielding layer 114 may be disposed over the lens layer 111. In this case, the light beam returned via the external object 30 may pass through the opening 114a of the light shielding layer 114 and reach the lens unit 111a corresponding to the opening.

In some examples, the aperture (or "clear diameter") of the opening 114a in the light shielding layer 114 is related to the position of the light shielding layer 114. For example, the closer the light-shielding layer 114 is to the display panel 20, the larger the aperture of the opening 114a in the light-shielding layer 114. Or when the light-shielding layer 114 is located between the lens layer 111 and the sensing array 121, the closer the light-shielding layer 114 is to the lens layer 111, the larger the aperture of the opening 114a in the light-shielding layer 114 is. Specifically, referring to fig. 4A, the aperture of the opening 114A in the first light-shielding layer 114A may be not more than 80 μm. The aperture of the opening 114a in the second light-shielding layer 114B may be not more than 30 μm. For example, the aperture of the opening 114A in the first light-shielding layer 114A may be 10 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 50 μm, 60 μm, 70 μm, or 80 μm, etc. The aperture of the opening 114a in the second light-shielding layer 114B may be 2 μm, 4 μm, 5 μm, 6 μm, 8 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, or the like.

In some examples, the light blocking layer 114 may be formed by coating, spraying, evaporation, stamping, or other suitable processes.

Fig. 5 is a schematic structural diagram illustrating a light sensing part 120 according to an example of the present disclosure.

In some examples, the optical sensing device 10 may include an optical sensing portion 120. In some examples, the light sensing part 120 may be located below the light guide part 110. That is, the light sensing part 120 is farther from the display screen 20 than the light guiding part 110.

In some examples, referring to fig. 5, the light sensing part 120 may include a sensing array 121. In some examples, the sensing array 121 may include a plurality of sensing units 121 a. In some examples, the sensing unit 121a may be used to receive a light beam and convert the received light signal into a corresponding electrical signal to perform corresponding information sensing. For example, the light guide 110 may guide a light beam returned from the external object 30 to the sensing unit 121a for information sensing. In some examples, the sensing unit 121a may be a photodetector or the like. In some examples, the plurality of sensing units 121a in the sensing array 121 may be distributed in an array. In some examples, there may be a space between adjacent sensing cells 121 a. Or adjacent sensing units 121a may be in contact with each other.

In some examples, each lens unit 111a may correspond to one or more sensing units 121a, respectively. Specifically, the area of the sensing array 121 that can receive the light beam through the lens unit 111a is the effective photosensitive area corresponding to the lens unit 111 a. The sensing unit 121a in the effective photosensitive area is defined as the sensing unit 121a corresponding to the lens unit 111 a. In this case, the light beam transmitted through the lens unit 111a may be received by the corresponding sensing unit 121a and converted into a corresponding electrical signal for information detection. Alternatively, the effective photosensitive region corresponding to one of the lens units 111a may include one sensing unit 121a, and may also include two or more sensing units 121a, which are not particularly limited by the examples of the present disclosure.

In some examples, each effective photosensitive area may correspond to one lens unit 111 a. In some examples, the effective photosensitive areas may not overlap with each other. In some examples, the effective photosensitive area may be directly opposite to the corresponding lens unit 111 a. In some examples, the effective photosensitive area may be smaller than the orthographic projection of the lens unit 111a on the photosensitive array 121. In this case, the effective photosensitive area may be located within a range of the orthographic projection of the lens unit 111a on the photosensitive array 121.

Examples of the present disclosure are not limited thereto, and in some examples, the position of the effective photosensitive area is offset in a vertical direction (i.e., a normal direction of the outer surface 20a of the display screen 20) with respect to the lens unit 111 a. For example, a line connecting the center of the effective photosensitive area and the optical center of the corresponding lens unit 111a may have a preset inclination angle with the vertical direction.

In some examples, as described above, the light shielding layer 114 may be disposed between the lens unit 111a and the sensing array 121. The light-shielding layer 114 may have an opening 114 a. In this case, each lens unit 111a may be disposed corresponding to the opening 114a and the sensing unit 121a in the light-shielding layer 114. For example, the center of the effective photosensitive area and the optical center of the lens unit 111a and the opening 114a in the light-shielding layer 114 may be collinear.

In some examples, referring to fig. 5, the light sensing part 120 may include a dielectric layer 122. In some examples, a read circuit and other auxiliary circuits, etc. electrically connected to the sensing array 121 may be disposed in the dielectric layer 122. External circuitry may be electrically connected to sense array 121 via circuitry disposed within dielectric layer 122 to transmit signals. For example, the sensing array 121 can receive the light beam and convert the light beam into an electrical signal, and the electrical signal can be transmitted to an external circuit through a reading circuit in the dielectric layer 122 for information sensing.

In some examples, dielectric layer 122 and sense array 121 may be fabricated on a single chip by semiconductor processes. For example, the light sensing part 120 may be an optical imaging chip or an optical fingerprint sensor, etc. In some examples, dielectric layer 122 may be disposed over sense array 121. That is, dielectric layer 122 may be closer to light guide 110 than sense array 121.

In some examples, a light blocking layer 123 may be disposed inside the dielectric layer 122. The light-blocking layer 123 may be configured to have a similar action to the light-shielding layer 114. For example, the light blocking layer 123 may be provided with light passing holes 123a corresponding to the lens units 111a and the openings 114a of the light blocking layer 114, and the light beams converged by the lens units 111a pass through the corresponding openings 114a of the light blocking layer 114 and then are guided to the photosensitive array 121 below the light blocking layer 122 through the corresponding light passing holes 123a of the light blocking layer 123. In some examples, the light blocking layer 123 may be made of a material that is poorly transmissive or capable of reflecting or absorbing light. For example, light blocking layer 123 may include a metal layer and/or other light-impermeable components and the like for constituting circuitry (e.g., read circuitry or auxiliary circuitry) inside dielectric layer 122. It is understood that, in different examples, one or more different light-blocking layers 123 may be disposed in the dielectric layer 122, and light-passing holes 123a corresponding to the lens units 111a and the openings 114a in the light-blocking layer 114 are respectively formed in each light-blocking layer 123. The light-passing holes 123a on the light-blocking layer 123 and the corresponding openings 114a on the light-blocking layer 114 can together form a diaphragm structure matched with the corresponding lens units 111a, so as to guide the light beams returning within the preset angle range to the corresponding light-sensing units 121a for sensing, and effectively suppress light crosstalk caused by stray light at other angles outside the preset angle range, thereby improving the sensing accuracy of the optical sensing device.

In some examples, the light passing holes 123a in the light blocking layer 123 may be disposed in substantially the same manner as the positions of the openings 114a in the light blocking layer 114, so that the light beams condensed by the lens units 111a may be transmitted to the photosensitive units 121a below the light blocking layer 123 through the light passing holes 123 a. For example, each lens unit 111a may be disposed corresponding to the light passing hole 123a in the light blocking layer 123 and the sensing unit 121a below. Specifically, the center of the effective photosensitive area and the optical center of the lens unit 111a and the center of the light passing hole 123a in the light blocking layer 123 may be collinear. In some examples, a plurality of light blocking layers 123 may be disposed inside the dielectric layer 122. The center of the light passing hole 123a in each layer of the light blocking layer 123 may be collinear with the optical center of the corresponding lens unit 111 a.

In some examples, the centers of the light passing holes 123a in the light blocking layer 123, the optical centers of the lens units 111a, and the centers of the effective photosensitive areas may be aligned in a direction perpendicular to the outer surface 20a of the display screen 20. It is understood that, in other embodiments, the centers of the light-passing holes 123a in the light-blocking layer 123, the light centers of the lens units 111a, and the centers of the effective photosensitive areas may also be aligned along a direction having a preset inclination angle with respect to the normal of the outer surface 20a of the display screen 20.

In some examples, as described above, the optical sensing device 10 may include the light guide 110 and the light sensing portion 120. Wherein the light guide 110 may be packaged with the light sensing portion 120. The light guide 110 may be disposed above the light sensing part 120. For example, referring to fig. 3, the light guide 110 may be closer to the display screen 20 than the light sensing part 120. Each lens unit 111a may be disposed corresponding to the opening 114a in the light shielding layer 114, the opening 123a in the light blocking layer 123, and the sensing unit 121a below. Thereby, the light beams condensed by the lens unit 111a can pass through, for example, the corresponding opening hole 114a and the light passing hole 123a to be transmitted to the corresponding sensing unit 121a therebelow.

In some examples, light guide 110 may be provided as a separate component. In some examples, the light sensing part 120 may be provided as a separate component.

Fig. 6 is a schematic diagram illustrating the formation of an optical sensing device 10 according to an example of the present disclosure.

In some examples, referring to fig. 4A to 6, the light guide part 110 and the light sensing part 120 may be different parts independent from each other, and are connected and combined to form the optical sensing device 10 through the connection layer 115 after being separately manufactured. In some examples, the light guide 110 may be disposed above the light sensing part 120 by adhesion. For example, the light guide 110 may be adhered together by an adhesive and the light sensing part 120. The adhesive may be a Die Attach Film (DAF), a solid glue, a liquid glue, an optical glue, or any other suitable adhesive material. In this case, the adhesive may fill and spread the opposite portions between the light guide 110 and the light sensing part 120 to form the connection layer 115. Thereby, the light guide unit 110 and the light sensing unit 120 can be connected together, and the optical sensing device 10 can perform better information sensing. In some examples, the connection layer 115 may be formed using a light permeable material. In this case, the light beam guided to the connection layer 115 via the light guide 110 can pass through the connection layer 115 to reach the light sensing part 120.

In some examples, when the light guide portion 110 and the light sensing portion 120 are combined, an alignment device (e.g., an optical focusing device) may be used as an auxiliary tool to align the light guide portion 110 and the light sensing portion 120, so that after the light guide portion 110 and the light sensing portion 120 are combined into the optical sensing device 10, a light beam returned by the external object 30 may be guided by the light guide portion 110 and transmitted to a corresponding sensing unit 121a of the light sensing portion 120 for information sensing.

In the embodiment according to the present disclosure, specifically described by taking fig. 6 as an example, the light guide unit 110 may be disposed above the light sensing unit 120 as a relatively independent component. A connection layer 115 may be formed between the light guide 110 and the light sensing part 120. The light guide 110 may be connected with the light sensing part 120 via a connection layer 115. When the light guide 110 is disposed on the light sensing portion 120, the optical centers of the lens units 111a, the center of the corresponding opening 114a on the light shielding layer 114, the center of the corresponding light passing hole 123a on the light blocking layer 123, and the center of the corresponding effective photosensitive area may be collinear. For example, referring to fig. 6, the optical center G of the lens unit 111a, the opening center a1 of the first light-shielding layer 114A, the opening center a2 of the second light-shielding layer 114B, the center a3 of the light-passing hole 123a of the light-blocking layer 123, and the corresponding sensing unit 121a₁May be aligned in a vertical direction.

In some examples, the connection layer 115 may also be doped with a filtering material, such that the connection layer 115 itself has a filtering effect. In this case, the connection layer 115 may filter light instead of the filter layer 113, so that the filter layer 113 does not need to be provided. Thereby, the thickness of the optical sensing device 10 can be reduced.

In other examples, the light guide 110 may also be directly fabricated on the light sensing part 120 through a semiconductor process.

(electronic device 1)

The embodiment that the present disclosure relates to also provides an electronic device 1. The electronic device 1 may comprise a display screen 20 and the optical sensing arrangement 10 of the various embodiments described above. In some examples, the optical sensing device 10 may be disposed below the display screen 20 and perform information sensing or the like on the external object 30 approaching or contacting the display screen 20.

In some examples, the electronic device 1 may further comprise an excitation light source (not shown). In some examples, the excitation light source may send a light beam to the external object 30, and the light beam, after returning through the external object 30, may be received by the below-screen optical sensing device 10 through the display screen 20. Thereby, the electronic apparatus 1 can perform information sensing better. In some examples, the excitation light source may be a light source that emits infrared light or particular wavelengths of non-visible light.

In some examples, the excitation light source may be an internal light source or an external light source, etc. For example, the excitation light source may be disposed below a backlight module of the display screen, or disposed in an edge area below a protective cover of the electronic device 1, or directly provided by the backlight module as the excitation light source to assist information sensing. In other examples, the display 20 may adopt a display having a self-light emitting display unit, such as an organic light emitting diode display or a micro light emitting diode display. In this case, the illuminable elements (e.g., organic light emitting diodes, etc.) in the display screen 20 may act as excitation light sources to provide light beams to assist in information sensing.

In some examples, the electronic device 1 may be a suitable type of electronic product such as a consumer electronic product, a home-based electronic product, a vehicle-mounted electronic product, or a financial terminal product. For example, the consumer electronic product may be a mobile phone, a tablet computer, a notebook computer, a desktop display, a personal computer, or the like. The household electronic product can be an intelligent door lock, a television or a refrigerator and the like. The vehicle-mounted electronic product can be a vehicle-mounted navigator or a vehicle-mounted DVD and the like. The financial terminal product can be an ATM machine or a self-service terminal and the like.

In the description herein, references to the description of the terms "one embodiment," "certain embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An optical sensing device, comprising:

the light sensing part comprises a sensing array and a medium layer arranged above the sensing array, the sensing array comprises a plurality of sensing units for receiving light beams for sensing, a light blocking layer for blocking the light beams is arranged in the medium layer, a plurality of light through holes corresponding to the sensing units are formed in the light blocking layer, and

the light guide part is positioned above the light sensing part and used for guiding light beams to the light sensing part, the light guide part comprises a lens layer used for converging the light beams, the lens layer comprises a plurality of lens units, each lens unit corresponds to a light through hole in the light blocking layer and a sensing unit below the light through hole, and the light beams within a preset angle range can penetrate through the light through hole corresponding to the lens unit after being converged by the lens units and are received by the light sensing unit corresponding to the lens unit below the light through hole.

2. The optical sensing device of claim 1,

the light guide portion further includes a substrate, the lens layer is located above the substrate, and the substrate has an upper surface and a lower surface opposite to the upper surface.

3. The optical sensing device of claim 2,

the light guide part further comprises one or more filter layers for filtering light out of a target wavelength band, the filter layers are located below the lens layer, and the filter layers are arranged on the upper surface and/or the lower surface of the substrate.

4. The optical sensing device of claim 3,

the light guide portion further includes one or more light shielding layers located below the lens layer for shielding light beams, the light shielding layers being provided with a plurality of openings through which the light beams can be transmitted to below the light shielding layers, the light shielding layers being disposed on filter layers provided on the upper surface and/or the lower surface of the substrate.

5. The optical sensing device of claim 4,

the opening of each light shielding layer corresponds to each lens unit, the light through hole in the light shielding layer and the sensing unit, and the light beams in the preset angle range are converged by the lens units and then pass through the opening and the light through hole corresponding to the lens unit to reach the sensing unit corresponding to the lens unit.

6. The optical sensing device of claim 5,

the optical centers of the lens units, the centers of the corresponding openings in the light shielding layer and the centers of the corresponding light through holes in the light blocking layer are collinear.

7. The optical sensing device according to claim 2, wherein the substrate is a transparent glass substrate or a transparent resin substrate.

8. The optical sensing device of claim 1,

the lens unit, the light through hole corresponding to the lens unit and the photosensitive unit corresponding to the lens unit are aligned in the vertical direction, so that light beams in the approximately vertical direction can penetrate through the light through hole corresponding to the lens unit after being converged by the lens unit and then can be received by the photosensitive unit corresponding to the lens unit; or

The lens unit, the light through hole corresponding to the lens unit and the photosensitive unit corresponding to the lens unit are aligned along a preset inclination angle, so that light rays along the preset inclination angle direction can penetrate through the light through hole corresponding to the lens unit to be received by the photosensitive unit corresponding to the lens unit below after being converged by the lens unit, and the inclination angle refers to an angle deviating from the vertical direction.

9. The optical sensing device of claim 1, wherein the light blocking layer comprises a metal layer and/or other light-impermeable components for forming circuitry within the dielectric layer.

10. An electronic device, comprising a display screen and the optical sensing device according to any one of claims 1 to 9, wherein the optical sensing device is disposed below the display screen, the display screen is used for displaying pictures, and the optical sensing device is used for receiving light beams returned by fingers of a user through the display screen for corresponding fingerprint information sensing.

11. The electronic device according to claim 10, wherein the display screen has a detection area for collecting fingerprint information in contact with a finger on an outer surface thereof, each lens unit has a corresponding target detection area in the detection area, and a portion of the light beam returning from the target detection area within a preset angle range is received by the corresponding sensing unit being converged to the lower side through the lens unit.

12. The electronic device of claim 11, wherein the target detection areas corresponding to adjacent lens units are partially overlapped; or

The target detection areas corresponding to the adjacent lens units are connected; or

The target detection areas corresponding to the adjacent lens units are separated by a preset distance.