CN111461057A - Under-screen biometric detection systems and electronics - Google Patents

Abstract

The present application provides an under-screen biometric detection system and an electronic device including the under-screen biometric detection system. The under-screen biometric detection system includes a passive light-emitting display device and a biometric detection device. The passive light-emitting display device includes a display panel and a backlight module. The backlight module includes: a light guide plate, the side of the light guide plate facing the display panel has a first light condensing structure extending toward the display panel, and the upper surface of the light guide plate includes the first light concentrating structure. the surface of the light structure, the first light concentrating structure is used for condensing the light emitted from the inside of the light guide plate to the upper surface of the light guide plate; wherein, from the lower surface of the light guide plate to the biometric detection A second light condensing structure is arranged in the light path of the photosensitive surface of the device, and the second light condensing structure is used for condensing the light emitted from the lower surface of the light guide plate.

Description

Under-screen biometric detection systems and electronics

technical field

The embodiments of the present application relate to the field of detection technology, and more particularly, to a backlight module, a liquid crystal display device screen, a biometric detection device, an under-screen biometric detection system, and electronic equipment.

Background technique

Non-self-luminous displays such as liquid crystal display (LCD) screens, including backlight modules for providing visible light and display panels for information display using visible light, based on such displays to realize biometric detection under the screen, it is necessary to provide a light source that actively emits light, A detection beam is emitted to an external object using a light source, and then a detection beam with biometric information of the external object returned from the external object is received.

The light guide plate is a key structure in the backlight module. The upper surface of the light guide plate is formed with a microstructure (or V-cut structure), which is usually a prism structure with a zigzag distribution, as shown in Figure 1. Directs the incident light from the edge direction to the viewing direction, and increases the brightness and uniformity of the light.

After the detection beam returns from the external object, it needs to pass through the backlight module in the display screen to reach the biometric detection device under the screen. Therefore, the microstructure on the light guide plate in the backlight module will affect the imaging effect of biometric detection. The segmentation problem shown in Figure 1 affects the accuracy of biometric detection.

SUMMARY OF THE INVENTION

The present application provides an under-screen biometric detection system and electronic device, which can improve the accuracy of under-screen biometric detection.

In a first aspect, the present application provides an under-screen biometric detection system, including a passively luminescent display device and a biometric detection device, the biometric detection device being configured to be disposed under the passively luminescent display device to realize a screen For biometric detection, the passively emitting display device includes a display panel and a backlight module, the backlight module is arranged below the display panel, the display panel is used for displaying pictures, and the backlight module is used for Provide visible light for the display panel to realize picture display, and the backlight module includes:

A light guide plate, comprising an upper surface and a lower surface arranged opposite to each other, wherein the upper surface of the light guide plate is the side surface of the light guide plate facing the display panel, and the lower surface of the light guide plate is the light guide plate The surface on the side facing away from the display panel, the side of the light guide plate facing the display panel has a first light-concentrating structure extending toward the display panel, and the upper surface of the light guide plate includes the first light-concentrating structure. the surface of the light-concentrating structure, the first light-concentrating structure is used for condensing the light emitted from the inside of the light guide plate to the upper surface of the light guide plate; wherein, from the lower surface of the light guide plate to the biological feature A second light condensing structure is arranged in the light path of the photosensitive surface of the detection device, and the second light condensing structure is used for condensing the light emitted from the lower surface of the light guide plate;

The biometric detection device includes:

an image sensor for receiving, through the passively emitting display device, a detection light beam returned from an external object above the passively emitting display device, wherein the detection light beam returned from the external object passes through the first light condensing structure Then, it is dispersed and transmitted, and the detection beam that is dispersed and transmitted is condensed after passing through the second condensing structure. The subject's biometric information.

In some optional implementation manners, both the first light-concentrating structure and the second light-concentrating structure are prism structures, and they are disposed opposite to each other; or

The first light-concentrating structure and the second light-concentrating structure are both arc-shaped convex structures, and they are arranged opposite to each other.

In some optional implementations, the first light-concentrating structure includes a plurality of first prisms arranged in parallel, and the second light-concentrating structure includes a plurality of second prisms arranged in parallel, wherein the plurality of The first prism and the plurality of second prisms are arranged one by one facing each other and opposite to each other; or

The first light collecting structure includes a plurality of first prisms arranged in parallel, the second light collecting structure includes a single third prism, wherein the plurality of first prisms and the third prism are arranged opposite to each other; or

The first light-concentrating structure includes a plurality of first arc-shaped convex structures arranged in parallel, and the second light-concentrating structure includes a plurality of second arc-shaped convex structures arranged in parallel, wherein the plurality of first arc-shaped convex structures are arranged in parallel. An arc-shaped protruding structure and the plurality of second arc-shaped protruding structures are arranged one by one and opposite to each other; or

The first light-concentrating structure includes a plurality of first arc-shaped convex structures arranged in parallel, the second light-concentrating structure includes a single third arc-shaped convex structure, wherein the plurality of first arc-shaped convex structures The structure and the third arc-shaped convex structure are arranged opposite to each other.

In some optional implementation manners, the first prism and the second prism disposed facing each other are the same prism; or

The first prism and the third prism have similar shapes, and the size of the third prism is larger than that of the first prism.

In some optional implementations, the size of the third prism is configured such that all light emitted from the lower surface of the light guide plate within the field of view of the biometric detection device is converged.

In some optional implementations, the plurality of first arc-shaped convex structures arranged in parallel are a plurality of first lenses, and the plurality of second arc-shaped convex structures arranged in parallel are a plurality of second lenses , the focal points of the first lens and the second lens are coincident, and the ratio of the diameters of the first lens and the second lens is the difference between the focal lengths of the first lens and the second lens Compare.

In some optional implementation manners, the plurality of first prisms are triangular prisms, the third prisms are also triangular prisms, and the vertex angles of the first prisms and the third prisms are equal and opposite.

In some optional implementations, the backlight module further includes:

The reflection sheet is arranged below the lower surface of the light guide plate, and the second light concentrating structure is arranged at the lower surface of the reflection sheet.

In some optional implementations, the second light-concentrating structure is arranged on the entire area of the lower surface of the reflection sheet, or is arranged in a partial area of the lower surface of the reflection sheet, and the partial area is the biological The field of view of the feature detection device is in the area facing the lower surface of the reflective sheet.

In some optional implementations, the backlight module further includes:

A metal reinforcement plate is arranged below the reflection sheet, and an opening is arranged in the metal reinforcement plate, and the lower part of the opening is used for disposing the biological feature detection device, and the second light-concentrating structure is arranged below the open area.

In some optional implementations, the size of the second light-concentrating structure is larger than the size of the opening.

In some optional implementation manners, the second light-concentrating structure is disposed in a local area of the lower surface of the light guide plate; or, a local area of the side of the light guide plate facing away from the display panel extends out of the second light-concentrating structure, the lower surface of the light guide plate includes the lower surface of the second light-concentrating structure; the local area is where the field of view of the biometric detection device is on the lower surface of the light guide plate right area.

In some optional implementation manners, the lower surface of the light guide plate is provided with a dot structure, and the partial area of the lower surface of the light guide plate is not provided with the dot structure.

In some optional implementations, the distribution of the dots in the surrounding area of the local area is configured such that the brightness of the display screen in the local area and the display screen brightness in the surrounding area are comparable to make the brightness of the display screen uniform.

In some optional implementations, the second light-concentrating structure is disposed on the photosensitive surface of the biometric detection device.

In some optional implementations, the light guide plate further includes a light incident surface located between the upper surface and the lower surface, and the backlight module further includes:

The backlight source is arranged on one side of the light incident surface of the light guide plate, wherein the visible light emitted by the backlight light source enters the interior of the light guide plate through the light incident surface, and exits from the upper surface of the light guide plate , the arrangement direction of the first light concentrating structures is parallel to the light incident surface.

In some optional implementation manners, when there are multiple second light concentrating structures, both the first light concentrating structure and the second light concentrating structure are elongated structures.

In some optional implementations, the biometric detection device further includes:

The detection light source is used to provide the detection beam required for the detection of biometric information;

Wherein, the detection beam emitted by the detection light source returns from the external object above the passively emitting display device, passes through the panel display panel, and then enters the backlight module, and passes through the first backlight module in the backlight module. The light-condensing structure is condensed and then dispersed and transmitted, and is further condensed through the second light-concentrating structure, and finally incident on the photosensitive surface of the image sensor.

In some optional implementations, the detection light source is an infrared light source, and the detection light beam is near-infrared light.

In some optional implementations, the biometric detection device further includes:

The filter is arranged between the backlight module and the photosensitive surface of the image sensor, and is used for filtering out the light signal of the wavelength band not used for biometric detection.

In some optional implementations, the biometric detection device is a fingerprint detection device, configured to detect fingerprint information from an external object above the passively illuminated display device.

In a second aspect, the present application further provides an electronic device, including: the under-screen biometric detection system according to any one of the implementation manners of the first aspect.

Based on the above technical solutions, the first light condensing structure can condense the light emitted from the inside of the light guide plate to the upper surface of the light guide plate, and the condensed light is further dispersed and transmitted to realize the light guiding effect of the light guide plate. For the detection beam returned from the external object, the first light condensing structure can perform spectral processing on the detection beam returned from the external object. Further, by arranging a second light condensing structure between the lower surface of the light guide plate and the photosensitive surface of the biometric detection device, the light that undergoes spectroscopic processing through the first light concentrating structure continues to be transmitted down to the The second light-converging structure, the second light-converging structure performs light-combining processing on the light that has undergone spectral processing to obtain a combined detection beam, and performs biometric information detection based on the detection beam, thereby avoiding image separation. Like problems, improve the accuracy of biometric detection.

Description of drawings

FIG. 1 is a schematic structural diagram of a light guide plate.

FIG. 2 is a schematic plan view of an electronic device to which the present application can be applied.

FIG. 3 is a schematic partial cross-sectional view of one embodiment of the electronic device shown in FIG. 2 .

FIG. 4 is a schematic diagram of a typical structure of a backlight module.

FIG. 5 is a schematic diagram of a microstructure of the light guide plate.

FIG. 6 is a schematic structural diagram of a backlight module according to an embodiment of the present application.

7 to 8 are schematic views of typical structures of the second light-concentrating structure.

FIG. 9 is a schematic diagram of another microstructure of the light guide plate.

FIG. 10 is a schematic diagram of an optical path of a part of the microstructure of the light guide plate shown in FIG. 9 .

11 to 13 are schematic diagrams of typical arrangements of the second light-concentrating structure.

FIG. 14 is a schematic structural diagram of an LCD screen according to an embodiment of the present application.

FIG. 15 is a schematic structural diagram of a biological feature detection apparatus according to an embodiment of the present application.

FIG. 16 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed ways

In the detailed description of embodiments of the present application, it will be understood that when a substrate, sheet, layer or pattern is referred to as being "on" or "under" another substrate, sheet, layer or pattern, it It may be "directly" or "indirectly" on another substrate, another sheet, another layer or another pattern, or one or more intervening layers may also be present. The thickness and size of each layer in the drawings of the specification may be exaggerated, omitted or schematically represented for the purpose of clarity. Furthermore, the sizes of elements in the drawings do not fully reflect actual sizes.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures. Further, the described features and structures may be combined in any suitable manner in one or more embodiments.

In the following description, numerous specific details are provided in order to enable a thorough understanding of the embodiments of the present application. However, one skilled in the art will appreciate that the techniques of the present application may be practiced without one or more of the specific details, or with other structures, components, etc.

Before introducing the technical solutions of the embodiments of the present application, first, with reference to FIG. 2 and FIG. 3 , a brief description of the electronic equipment to which the present application is applied is given.

FIG. 2 is a perspective structural view of an electronic device 100 to which the present application is applied, and FIG. 3 is a partial cross-sectional view of the electronic device 100 shown in FIG. 2 along the A-A direction.

It should be understood that the electronic device 100 in this embodiment of the present application may include, but is not limited to, a smart phone, a tablet computer, a computer, a laptop computer, a smart wearable device, a smart door lock, and the like. In order to implement the basic functions of the electronic device 100, in addition to the modules or components exemplified below, the electronic device 100 in this embodiment of the present application may also include other necessary modules or components. Taking the electronic device as an example of a smartphone, it may also include a communication module, a speaker, a microphone, a battery, and the like.

For the convenience of distinction and description, in the normal use state of the electronic device 100, the direction in which the display screen of the electronic device 100 points or faces the user is defined as "up", and the opposite direction or the direction facing away from the user is defined as "up". "Down". The electronic device 100 has a length direction, a width direction and a thickness direction that are perpendicular to each other, as shown in FIG. 2 and FIG. 3 , which are represented by a Y axis, an X axis, and a Z axis, respectively. It should be understood that the definitions of the various directions in the embodiments of the present application are only for the convenience of description, and are not intended to be limitations of the embodiments of the present application.

In some embodiments, as shown in FIG. 3 , the electronic device 100 may include a display module 12 and a detection module 19 , the detection module 19 is disposed below the display module 12 , and the display module 12 has a display module 12 . The detection area VA for contact with the external object 1000 . When the external object 1000 contacts the detection area VA, the detection module 19 may collect a biometric image of the external object 1000 and obtain corresponding biometric information. The external object 1000 may be, for example, a finger. Correspondingly, the detection module 19 may collect a fingerprint image of the finger to obtain corresponding fingerprint feature information.

Optionally, in some embodiments, as shown in FIG. 3 , the electronic device 100 may further include a protective layer 11 disposed above the display module 12 and covering the front surface of the electronic device 100 . That is, the upper surface (not numbered) of the protective layer 11 may be the outermost surface of the electronic device 100 . In this case, the detection area VA is at least a partial area of the upper surface of the protective layer 11 . For example, the detection area VA may be any partial area of the upper surface of the protective layer 11 , or the entire area of the upper surface of the protective layer 11 . In one embodiment, the A-A line of the electronic device 100 is parallel to the Y axis and intersects the detection area VA. More specifically, the A-A line of the electronic device 100 may be a straight line parallel to the Y-axis passing through the center point of the detection area VA.

It should be understood that the protective layer 11 may include a plastic film, tempered film, or other films that are attached by the user in actual use, and the upper surface of the protective layer 11 is the surface that the external object 1000 directly contacts during biometric detection. The upper surface of the protective layer 11 is the outermost surface of the electronic device 100 . Here, for example, but not limited to, the external object 1000 may be a finger, and the biometric feature is a fingerprint. In other or modified embodiments, the biometric feature may be, but not limited to, fingerprints, toe prints, palm prints, skin lines, blood vessels, and the like.

In some embodiments, the display module 12 may be a self-luminous display module having a self-luminous display unit, for example, the display module 12 may be an OLED display module, or a Micro-LED display module Modules, etc., the self-luminous display unit in the display module 12 can provide detection beams for biometric detection. For example, some self-luminous units in the display module 12 can be used as detection light sources for biometric detection.

In other embodiments, the display module 12 may be a passive light-emitting display module, for example, an LCD display module, which may include a liquid crystal display panel (not shown in FIG. 3 ) and a backlight unit (not shown in FIG. 3 ) out). The backlight unit is used to provide visible light to the side where the liquid crystal display panel is located, and the visible light can reach the user's eyes after passing through the liquid crystal display panel and the protective layer 11, thereby realizing information display, including but not limited to Text display, image display, etc.

In some embodiments, the liquid crystal display panel may include a CF (Color Filter) substrate, a liquid crystal layer, a TFT (Thin Film Transistor) substrate, and a multi-layer structure such as a polarizer. The backlight unit may include a multi-layer structure such as a reflective sheet, a light guide plate, a diffusion sheet, and a light enhancement sheet.

Further, as shown in FIG. 3 , the electronic device 100 further includes a detection light source 16 , which can provide a detection beam 101 , and the detection beam 101 can penetrate the protective layer 11 to reach the external object 1000 . The detection beam 101 is reflected on the external object 1000 or the detection beam 101 enters the interior of the external object 1000 and is transmitted out, thereby carrying the biometric information of the external object 1000 . The detection beam 101 carrying the biometric information of the external object 1000 can penetrate the protective layer 11 and the display module 12 and then be received by the detection module 19 and used to generate the biometric image of the external object 1000 .

In some embodiments, the protective layer 11 includes a non-transparent part 112 and a transparent part 114 , and the non-transparent part 112 is located around or at the edge of the transparent part 114 . The non-transparent portion 112 can block visible light, and the transparent portion 114 can transmit visible light. The surface of the protective layer 11 facing away from the display module 12 (ie, the upper surface of the protective layer 11 ) has the detection area VA, and the detection area VA is a partial area of the upper surface of the protective layer 11 . Optionally, part or all of the detection area VA is located in the transparent portion 114 . The display module 12 can transmit visible light through the transparent portion 114 of the protective layer 11 to realize information display.

The detection light source 16 is located below the non-transparent portion 112 . The detection light source 16 can provide the detection beam 101 above the protective layer 11 . The wavelength of the detection beam 101 is different from the wavelength of visible light. The wavelength of the detection beam 101 may be different from the visible light. The detection beam 101 may be invisible light. For example, but not limited to, the detection beam 101 may be near-infrared light with a wavelength range of 780 nanometers to 2000 nanometers. Further, the wavelength of the detection beam 101 may be 850 nanometers or 940 nanometers. Both the non-transparent portion 112 and the transparent portion 114 can transmit the detection beam 101 .

Optionally, the electronic device 100 further includes a middle frame 13 , the middle frame 13 includes a bottom portion 131 and a side portion 132 , wherein the display device 12 is disposed between the middle frame 13 and the protective layer 11 . The bottom 131 of the middle frame is provided with a through hole 1311 , and the detection module 19 receives the detection beam returned by the external object 1000 through the through hole 1311 , for example. The side portion 131 is located at the side of the display module 132 and faces the non-transparent portion 112 . The detection light source 16 is, for example, but not limited to, disposed on the side portion 132 .

Alternatively, the through hole 1311 may not be provided on the bottom 131 of the middle frame, and the detection module 19 is provided on the side surface of the bottom 131 facing the display module 12 .

Optionally, in some embodiments, the detection light source 16 includes a light emitting unit 161 for emitting a detection beam. Optionally, the detection light source 16 further includes a conversion unit 162 . The conversion unit 162 is, for example, disposed on the light-emitting unit 161 , and is used to convert the exit angle of the detection beam emitted by the light-emitting unit 161 .

Of course, alternatively, in some other implementation manners, the detection light source 16 may also be disposed below the display module 12, or integrated in the backlight light source of the backlight unit, or the like.

Optionally, in some embodiments, the protective layer 11 may be a single-layer structure or a multi-layer structure. The protective layer 11 is generally a thin plate with predetermined length, width and thickness. The protective layer 11 has a length direction corresponding to the Y axis, a width direction corresponding to the X axis, and a thickness direction corresponding to the Z axis. The protective layer 11 may include a transparent substrate (not shown) and an optical ink layer (not shown), the transparent substrate can transmit visible light and the detection beam 101 , and the optical ink layer can block visible light and transmit the detection beam 101 . The optical ink layer may be disposed on the lower surface of the protective layer 11 near the edge, so that the protective layer 11 forms the non-transparent part 112 and the transparent part 114 . Optionally, the transparent substrate is, for example, but not limited to, glass, plastic, resin or any other transparent material. The optical ink layer is, for example, but not limited to, infrared ink that can transmit near-infrared light and block visible light. At this time, the detection module 19 can use near-infrared light as the detection beam 101 to realize the biometric detection of the external object 1000 .

When the display module 12 is an LCD display module, the working principle of the backlight unit in the LCD display module will be described with reference to FIG. 4 .

As a typical structure, as shown in FIG. 4 , the backlight unit includes, from the upper layer to the lower layer, an increasing sheet 115 , a diffusing sheet 116 , a light guide plate 117 , a backlight light source 17 , and a reflective sheet 118 .

The reflective sheet 118 is used for total reflection of the visible light emitted from the lower surface of the light guide plate 117 to the upper side of the display panel. The light guide plate 117 is used for guiding the visible light emitted by the backlight light source 17 to the entire display panel. The diffusion sheet 116 It is used to diffuse the visible light signal transmitted by the light guide plate 117 and transmit it to the brightness enhancement sheet 112. The brightness enhancement sheet 112 is used to correct the light exit angle of the received visible light signal to increase the visible light signal emitted from the front of the display panel. strength.

In order to realize the light guiding function of the light guide plate 117, usually two layers of microstructures are formed on the light guide plate 117. As shown in FIG. ) 1172, a dot microstructure 1171 is formed on the side of the light guide plate 117 facing away from the display panel. In a specific implementation, the backlight light source 17 may be arranged on the side of the light guide plate 117, and the visible light emitted by the backlight source 17 enters the interior of the light guide plate 117. When the visible light enters the dot microstructure 1171 on the lower surface, the reflected light will go to the inside of the light guide plate 117. The light is diffused at various angles, and then converged by the light-concentrating microstructures 1172 on the upper surface of the light guide plate 117 and then emitted. The visible light signal emitted from the upper surface of the light guide plate 117 cooperates with other structures in the backlight unit to realize the front light emission of the display panel. However, in practical applications, the detection beam 101 returned from the external object 1000 will pass through the protective layer 11 and the display module 12 in sequence and then reach the detection module 19 . That is to say, the detection beam 101 will also be transmitted in the backlight unit in the display module 12, so the transmission of the detection beam 101 will be affected by the microstructure of the light guide plate, as shown in FIG. V-cut structure, the detection beam incident from the V-cut structure will be converged after passing through the V-cut structure, and the converged detection beam will be further dispersed and transmitted, which is equivalent to multiple detection beams returning from a certain point on the external object 1000 After being converged, it is further dispersed and transmitted to form a plurality of dispersed detection beams. When imaging is performed on the detection module 19 based on the plurality of dispersed detection beams, a problem similar to that shown in FIG. 1 will occur, which affects the biological characteristics. The accuracy of detection, and the V-cut structure will spread the detection beam to the bottom of the screen, resulting in loss of signal and affecting the imaging effect.

In view of this, the embodiments of the present application provide a solution. By adding a second light concentrating structure in the light path between the light guide plate and the detection module, the signals that are dispersed and transmitted after the microstructures of the light guide plate are converged can be Convergence processing is performed before entering the detection module, so that the influence of the microstructure in the light guide plate on the biometric detection can be reduced or eliminated, thereby improving the accuracy of the biometric detection.

It should be understood that the detection module in the embodiment of the present application may also be referred to as a biometric detection module, a biometric detection device, a biometric sensing device, etc., which can be used to collect biometric information of external objects, for example, fingerprint information, Palm print information, 3D face information, etc.

Hereinafter, with reference to FIGS. 6 to 13 , a backlight module according to an embodiment of the present application will be described.

It should be understood that the backlight module in the embodiment of the present application is a display module such as a backlight module in an LCD display module, and the display module may further include a display panel, and the backlight module is arranged below the display panel, and the display The panel is used for displaying pictures, and the backlight module is used for providing visible light for the display panel to realize picture display. Of course, alternatively, the display module can also be a suitable passive light-emitting display module such as an electronic paper display module.

As shown in FIG. 6 , the lower part of the backlight module 20 is used to set the biometric detection device 30 to realize the detection of biometric information under the screen, wherein the backlight module 20 includes:

The light guide plate 200 includes an upper surface 201 and a lower surface 202 opposite to each other, wherein the upper surface 201 of the light guide plate 200 is the side surface of the light guide plate 200 facing the display panel, and the light guide plate 200 The lower surface 202 of the light guide plate 200 is the surface on the side of the light guide plate 200 facing away from the display panel, and the side of the light guide plate 200 facing the display panel has a first light concentrating structure 210 extending toward the display panel, The upper surface 201 of the light guide plate 200 includes the surface of the first light concentrating structure 210 , and the first light concentrating structure 210 is used for the light emitted from the interior of the light guide plate 200 to the upper surface 201 of the light guide plate 201 . to gather;

Wherein, a second light concentrating structure 40 is provided in the light path from the lower surface of the light guide plate 200 to the photosensitive surface of the biometric detection device 30 , and the second light condensing structure 40 is used to detect the light from the light guide plate. The detection light emitted from the lower surface 202 of the 200 is converged.

Alternatively, a side of the light guide plate 200 facing away from the display panel has a second light concentrating structure 40 extending in a direction away from the display panel (the opposite direction of the Z-axis direction). The lower surface 202 of the light guide plate 200 The surface of the second light-concentrating structure 40 is included. Optionally, the second light concentrating structure 40 may extend from a partial area of the side of the light guide plate 200 facing away from the display panel.

Here, the first light-concentrating structure 210 may correspond to the light-concentrating microstructure 1172 in FIG. 5 , the biometric detection device 30 may correspond to the detection module 19 in FIG. 3 , and the related implementation may refer to the foregoing embodiments. For the sake of brevity, related descriptions are not repeated here.

It should be understood that, in the embodiment of the present application, the first light-concentrating structure 210 is a structure in the light guide plate 200 , that is, the first light-concentrating structure 210 belongs to the light guide plate 200 , which can be matched with a backlight module The other structures in 20 realize the display function of the display panel, and the present application does not limit the formation method of the first light concentrating structure 210. The first light concentrating structure 210 and other structures in the light guide plate 200 are an integrated structure formed of the same material.

In a specific light path, the first light condensing structure 210 can condense the light emitted from the inside of the light guide plate 200 to the upper surface 201 of the light guide plate 200 , and the condensed light is further dispersed and transmitted, so that the light guide effect of the light guide plate 200 can be realized. . For the detection beam 501 returned from the external object 1000 , the first condensing structure 210 can perform condensing processing on the detection beam 501 , and the converged detection beam is further dispersed and transmitted to form a detection beam 511 , and imaging is performed based on the detection beam 511 , which may cause the splitting problem in Figure 1.

Further, the scattered transmission detection beam 511 continues to be transmitted downward to the second light condensing structure 40, and the second light condensing structure 40 performs condensing processing on the scattered transmission detection beam 511 to obtain the converged detection beam 502, The biometric detection device 30 receives the detection beam 502 and performs biometric detection based on the detection beam 502, thereby avoiding the problem of image splitting during imaging and improving the accuracy of biometric detection.

It should be understood that the present application does not specifically limit the shape, size and arrangement of the first light concentrating structure 210 , as long as it can cooperate with other structures in the backlight module 20 to achieve the display purpose of the display module. The specific structures in the first light concentrating structure 210 and the second light concentrating structure 40 in FIG. 6 are only examples, and should not constitute any limitation to the present application.

As an embodiment, the first light condensing structure 210 is a prism structure. For example, as shown in FIG. 8 , the first light condensing structure 210 may include a plurality of first prisms 211 arranged in parallel, or the A light collecting structure 210 may also include a plurality of first prisms arranged in other manners.

As another embodiment, the first light-concentrating structure 210 may also be an arc-shaped convex structure. For example, as shown in FIG. 7 , the first light-concentrating structure 210 includes a plurality of first arc-shaped arranged side by side. The protrusions, or may also include a plurality of first arc protrusions arranged in other ways.

When the first light condensing structure 210 is a prism structure, the second light condensing structure 40 may also be designed as a prism structure, and may be designed as a prism structure disposed opposite to the first light condensing structure 210 .

As an example, as shown in FIG. 8 , the first light-concentrating structure 210 includes a plurality of first prisms 211 arranged in parallel, and the second light-concentrating structure 40 includes a plurality of second prisms 42 arranged in parallel. The plurality of second prisms 42 and the plurality of first prisms 211 face each other one by one.

The second prism 42 in the second light collecting structure 40 and the opposite first prism 211 are prisms with the same shape and size, and the second prism 42 and the opposite first prism 211 are opposite and aligned . In this way, after the detection beam 501 is condensed by the first prism 211 in the first light-condensing structure, the condensed detection beam is further dispersed and transmitted, and after the detection beam 511 is transmitted to the second light-condensing structure 40, The second prism 422 in the second light-condensing structure 40 is converged to form a detection beam 502 and transmitted to the biometric detection device 30. Further, the biometric detection device 30 performs biometrics based on the detection beam 502 to help eliminate the imaging time. image segmentation problem.

It should be understood that the plurality of first prisms 211 may be the same prism, or may be different prisms, which are not limited in this embodiment of the present application.

When the plurality of first prisms 211 are the same prism, the plurality of second prisms 42 may also be the same prism, and the plurality of first prisms 211 and the plurality of second prisms 42 are one-to-one Opposite and aligned settings.

When the plurality of first prisms 211 are different prisms, the plurality of second prisms 42 may also be different prisms, but the second prisms 42 and the opposite first prism 211 are the same prism, and the first The prism 211 and the opposite second prism 42 are located on the same optical path of the detection beam, so that the detection beam converged and dispersedly transmitted by the first prism 211 can be converged by the opposite second prism 42, so as to eliminate the separation of the detection beams. Like the purpose of the question.

As another example, as shown in FIG. 9 , the first light condensing structure 210 includes a plurality of first prisms 211 arranged in parallel, the second light condensing structure 40 includes a single third prism 43 , the third prism 43 and the The first prisms 211 are prisms with the same shape but different sizes (ie, the two are similar in shape), and the third prism 43 and the plurality of first prisms 211 are disposed opposite to each other. In this case, the third prism 43 does not need to be aligned with the first prism 211 . After the detection beam 501 returned from the external object 1000 is converged by the plurality of first prisms 211 in the first light focusing structure 210, the converged detection beam is further dispersed and transmitted to form a detection beam 511, which is transmitted to the first beam 511. After the light-concentrating structure 40 , the third prism 43 in the second light-converging structure 40 further performs converging processing to form a detection beam 502 , which is transmitted to the biometric detection device 30 . Biometric detection helps to eliminate image segmentation problems in imaging.

As a specific implementation manner, the first prism 211 is a triangular prism, the second prism 42 or the third prism 43 is also a triangular prism, and the vertex angle of the triangular prism in the first light condensing structure 210 and the second light condensing structure The apex angles of the triangular prisms in the structure 40 are the same and opposite.

Alternatively, in some embodiments, as shown in FIG. 9 , the first light-concentrating structure 210 is an arc-shaped convex structure. Please also refer to FIG. 6 , the second light-concentrating structure 40 can also be designed as a facing arc-shaped convex structure, and can also be designed as an arc-shaped convex structure disposed opposite to the first light-concentrating structure 210 .

As an embodiment, the first light-concentrating structure 210 includes a plurality of first arc-shaped convex structures arranged side by side. In this case, as an implementation manner, the second light-concentrating structure 40 may include a plurality of first arc-shaped convex structures. The second arc-shaped convex structures arranged side by side, wherein the plurality of first arc-shaped convex structures and the plurality of second arc-shaped convex structures are facing each other one by one, and each second arc-shaped convex structure The rising structure and the facing first arc-shaped convex structure are arranged opposite to each other; as another implementation manner, the second light-concentrating structure 40 includes a single third arc-shaped convex structure, wherein the plurality of first arcs The convex structure and the third arc convex structure are arranged opposite to each other.

For example, as shown in FIG. 10 , the plurality of side-by-side first arc-shaped convex structures may be a plurality of first lenses 2111 , and the plurality of side-by-side second arc-shaped convex structures may be is a plurality of second lenses 412, wherein the second lenses 412 are arranged below the facing first lens 2111, the focal points f of the first lens 2111 and the facing second lens 412 are coincident, and the The ratio of the diameter D1 of the first lens 2111 to the diameter D2 of the second lens 412 is the ratio of the focal length f1 of the first lens 2111 to the focal length f2 of the second lens 412 . Optionally, the diameter D2 of the second lens 412 is smaller than the diameter D1 of the first lens 2111 .

Correspondingly, after the detection beam 501 returned from the external object 100 enters the backlight module 20, the detection beam 511 is formed after being converged by the first lens 2111 in the light guide plate 200 of the backlight module 20, and the detection beam 511 is further transmitted to the corresponding first lens. The second lens 412 forms the detection beam 502 after being converged by the second lens 412. Therefore, based on the above setting, the detection beam incident from above the light guide plate 200 is transmitted through the first lens 2111 and the second lens 412. It can be converged to the photosensitive surface of the biometric detection device 30 to the greatest extent, which is beneficial to ensure the non-destructive or nearly non-destructive transmission of the detection beam, and improve the imaging quality of biometric detection.

Optionally, in some embodiments, the plurality of second lenses 412 are disposed in a local area of the lower surface 202 of the light guide plate 200, or in other words, on the side of the light guide plate 200 facing away from the display panel The plurality of second lenses 412 extend out of the local area. The local area is the detection area where the field of view of the biometric detection device 30 is facing the lower surface 202 of the light guide plate 200 . The lower surface 202 of the light guide plate 200 includes the surfaces of the plurality of second lenses 412 . In this way, the propagation direction of the detection beam incident vertically downward (in the opposite direction along the Z-axis direction) to the surface of the first lens 2111 after passing through the second lens 412 can be basically unchanged, thereby improving the biometric sensing performance. Accuracy.

As a specific implementation manner, the size and arrangement of the dot structure in the local area on the lower surface of the light guide plate 200 may be modified according to the size and arrangement of the plurality of second lenses 412, so that the The processing of the optical path by the plurality of first lenses 2111 and the plurality of second lenses 412 in the local area can realize lossless or nearly lossless transmission of the detection beam passing through the local area on the light guide plate 200 .

In view of the optical path transmission of the detection beam in the foregoing embodiments, the first light concentrating structure 210 can detect the transmission along a specific direction (for example, the direction perpendicular to the display panel or the opposite direction along the Z-axis direction). The light beam 501 (assuming that the detection beam 501 is two beams of light from the same point on the external object, the external object is far away from the imaging surface, it can be approximated that the two beams of light are parallel lights) converge, and the converged detection beam Converted to the detection beam 511 that is scattered and transmitted in other directions (such as the direction inclined relative to the display panel), then imaging based on the scattered detection beam 511 will form images of multiple external objects, resulting in the aforementioned image splitting problem . In the embodiment of the present application, by arranging the second light condensing structure 40 in the optical path before entering the biometric detection device 30 to perform converging processing on the scattered transmission detection beam 511, the scattered transmission detection beam 511 can be Convergence, it can be understood that after passing through the second light concentrating structure 40, the scattered transmission detection beam 511 is converted to be transmitted in the original direction (that is, the transmission direction of the detection beam 501), that is, relative to the elimination of the first The light condensing structure 210 has an influence on the optical path transmission of the detection beam, so the problem of image splitting during imaging caused by the microstructure of the light guide plate 200 can be eliminated.

Optionally, in some embodiments, by arranging the plurality of second light concentrating structures 40 opposite to the plurality of first light concentrating structures 210 one by one, so that when the first light concentrating structures 210 converts the light signal in the first direction incident to the first light concentrating structure 210 into at least one light signal in the second direction, and then, the second light concentrating structure 40 is used to convert the light passing through the first concentrating structure 40 The at least one optical signal in the second direction transmitted by the structure 210 is converted into the optical signal in the first direction again and transmitted to the biometric detection device 30 . In this way, the problem of image splitting of the detection beam after passing through the first light condensing structure 210 on the light guide plate 200 can be solved. It should be understood that, in this embodiment of the present application, the second light concentrating structure 40 may be fixed at any position from the lower surface of the light guide plate 200 to the photosensitive surface of the biometric detection device 30. In some structures, the second light-concentrating structure 40 can be fixed, or the second light-concentrating structure 40 can be fixed by adding a new structure, such as a new bracket or a support plate. Alternatively, the second light concentrating structure 40 extends from a partial area of the side of the light guide plate 200 facing away from the display panel, that is, the second light concentrating structure 40 is a part of the light guide plate 200 itself.

In some embodiments of the present application, as shown in FIG. 11 to FIG. 13 , the backlight module 20 further includes:

The reflection sheet 300 is arranged below the lower surface of the light guide plate 200 , and the reflection sheet 300 is used to reflect the light emitted from the lower surface of the light guide plate 200 back into the light guide plate 300 , in order to improve the utilization efficiency of light.

Further, in other embodiments of the present application, as shown in FIG. 11 to FIG. 13 , the backlight module 20 may further include:

The metal reinforcement plate 400 is arranged below the reflection sheet 300, and the metal reinforcement plate 400 is provided with an opening, and the biometric detection device 30 is configured to be arranged under the opening for receiving A detection beam transmitted through the aperture returned from an external subject to obtain biometric information of the external subject.

11 to FIG. 13 , the first light-concentrating structure 210 and the second light-concentrating structure 40 are both prism structures as an example to describe the specific arrangement of the second light-concentrating structure 40 , and other cases The configuration of the second light-concentrating structure 40 described below is similar, and for the sake of brevity, details are not repeated here.

As an arrangement, as shown in FIG. 11 , the second light-concentrating structure 40 is arranged on the lower surface of the reflection sheet 300 .

Since the lower surface of the reflection sheet 300 is a smooth plane, disposing the second light-concentrating structure 40 on the lower surface of the reflection sheet 300 can realize the first light-concentrating structure 210 and the second light-concentrating structure The relatively precise alignment of the structures 40 enables the second light condensing structure 40 to perform relatively accurate converging processing on the scattered transmitted detection beams.

In addition, this setting method can be implemented without modifying other structures in the backlight module, which can reduce the influence on the display function of the display screen.

As a specific implementation, the second light-concentrating structure 40 can be pasted on the lower surface of the reflective sheet 300 , for example, the second light-concentrating structure 40 can be pasted on the lower surface of the reflective sheet 300 through optical glue surface, or the second light-concentrating structure 40 can also be fixed on the lower surface of the reflection sheet 300 in other ways.

In some embodiments, the second light-concentrating structure 40 is disposed on the entire area of the lower surface of the reflective sheet 300 .

In other embodiments, the second light-concentrating structure 40 is disposed at least in a partial area of the lower surface of the reflection sheet 300 , and the partial area is where the field of view of the biometric detection device 30 is in the reflection sheet The area facing the lower surface of 300, that is to say, the second light collecting structure 40 only needs to perform light combining processing on the detection beam within the field of view, and the detection beam outside the field of view is the biometric detection device 30. cannot be received, so it can be left unprocessed.

It should be noted that the field of view of the biometric detection device 30 corresponds to a corresponding area in each layer structure of the backlight module 20, and the field of view of the biometric detection device 30 corresponds to each layer structure The area of is reduced sequentially from top to bottom. As shown in FIG. 13 , the area of the field of view of the biometric detection device 30 facing the lower surface of the light guide plate 200 is the area S1 .

As another arrangement manner, as shown in FIG. 12 , the second light-concentrating structure 40 is arranged below the opening area of the metal reinforcing plate 400 .

In some specific implementations, the second light-concentrating structure 40 may be fixed on the lower surface of the opening area, or may also be fixed under the opening area through other structures, such as a bracket.

Taking the second light collecting structure 40 as a single triangular prism as an example, the single triangular prism can be fixed on the lower surface of the opening area of the metal reinforcing plate 400, and the single prism is close to the metal reinforcing plate 400. The size of one side is larger than the size of the opening, so that the prism can be fixed on the lower surface of the opening area, for example, the prism can be fixed to the metal reinforcement by double-sided adhesive or other means the lower surface of the board.

In a specific implementation, the size of the single triangular prism is configured so that the light emitted from the lower surface of the light guide plate 200 within the field of view of the biometric detection device 30 is converged, so that the light within the field of view can be converged. The detection beams returned from the external objects can be synthesized and further transmitted to the biometric detection device 30, which can improve the imaging quality of biometric detection.

As another setting method, as shown in FIG. 13 , the second light-concentrating structure 40 is arranged at least in the partial area S1 on the side of the light guide plate 200 facing away from the display panel, and the partial area S1 is the The field of view of the biometric detection device 30 is in the area facing the lower surface of the light guide plate. Wherein, the second light-concentrating structure 40 is, for example, a structure extending from the partial area S1 on the side of the light guide plate 200 facing away from the display panel, or the second light-concentrating structure 40 is disposed on the Structure on the lower surface of the light guide plate 200 .

As shown in FIG. 13 , a dot structure 220 is formed on the lower surface of the light guide plate 200 , and a partial area S1 in the light guide plate 200 can be modified to set the second light concentrating structure 40 in the partial area S1 . In some implementations, the local area S1 of the lower surface of the light guide plate 200 is not provided with the dot structure. Or in other implementation manners, the dot structure or the like may be provided in the gap of the second light concentrating structure 40 .

Wherein, the dot structure 220 may correspond to the dot microstructure 1171 in FIG. 5 , which is used to diffuse the light incident on the lower surface of the light guide plate 200 to various angles to achieve uniform light emission on the front of the display panel. When the second light-concentrating structure is arranged on the lower surface of the display panel, the front luminescence of the display panel may be affected. Therefore, further, the distribution of the dots in the surrounding area of the local area S1 can be adjusted, so that the brightness of the display panel in the local area and the The brightness of the display panel in the surrounding area is comparable to make the brightness of the display screen uniform.

For example, if the brightness of the display panel in the local area is reduced after the second light concentrating structure 40 is installed in the local area S1, in this case, the distribution of dots in the surrounding area of the local area can be set to be denser, or adjusted The diffusion angle of the dots in the surrounding area to the light, so as to improve the brightness of the display panel corresponding to the local area.

As another arrangement manner, the second light-concentrating structure 40 is arranged on the photosensitive surface of the biological feature detection device 30 .

In some embodiments, the second light-concentrating structure 40 may be disposed on the photosensitive surface of the biometric device 30 through optical glue or a fixing bracket.

Optionally, in some embodiments of the present application, the light guide plate 200 further includes a light incident surface, which is located between the upper surface and the lower surface of the light guide plate 200 , or in other words, is located on the surface of the light guide plate 200 On the side, the backlight module 20 further includes:

The backlight light source is arranged on the light incident surface side of the light guide plate 200 , wherein the visible light emitted by the backlight light source enters the interior of the light guide plate 200 through the light incident surface, and exits from the upper surface of the light guide plate 200 After exiting, the arrangement direction of the first light-concentrating structures 210 is parallel to the light-incident surface.

It should be understood that the backlight light source may correspond to the backlight light source 17 in FIG. 4 . For specific implementation, reference may be made to the relevant description of the embodiment shown in FIG. 4 , which is not repeated here for brevity.

As shown in FIG. 14, an embodiment of the present application further provides an LCD screen 60, including: a display panel 61 and a backlight module 62, the backlight module 62 is disposed below the display panel 61, wherein the display The panel 61 can correspond to, for example but not limited to, the liquid crystal display panel in the embodiment shown in FIG. 3 , and the backlight module 62 can correspond to the backlight module 20 in the embodiments shown in FIGS. The related descriptions are not repeated here for brevity.

As shown in FIG. 15 , an embodiment of the present application further provides a biometric detection device 70 , which is suitable for an electronic device having a passively illuminated display device, and the biometric detection device 70 is configured to be arranged in the passively illuminated display. Below the device to achieve off-screen biometric detection.

The passive light-emitting display device is, for example, but not limited to, an LCD display device. For example, the passive light-emitting display device is the above-mentioned display device having the backlight module 20 .

As described in the above embodiments, the LCD display device includes a display panel and a backlight module 20 . The backlight module 20 is disposed below the display panel. The display panel is used for displaying pictures. The backlight module 20 is used to provide visible light for the display panel to realize picture display. The backlight module 20 includes a light guide plate 200 . The light guide plate 200 includes an upper surface 201 and a lower surface 202 opposite to each other, wherein the upper surface 201 of the light guide plate 200 is the side surface of the light guide plate 200 facing the display panel. The lower surface 202 is the surface of the light guide plate 200 facing away from the display panel. A side of the light guide plate 200 facing the display panel has a first light condensing structure 210 extending toward the display panel. The upper surface 201 of the light guide plate 200 includes the surface of the first light concentrating structure 210 . Light converges. Wherein, a second light condensing structure 40 is provided in the light path from the lower surface 202 of the light guide plate 200 to the photosensitive surface of the biometric detection device 70 , and the second light condensing structure 40 is used to detect the light from the guide plate 200 . The light emitted from the lower surface 202 of the light plate 200 is converged.

The biometric detection device 70 further includes:

The image sensor 72 is configured to receive the detection light beam returned from the external object 1000 above the LCD display device, which is converged by the first light condensing structure 210 and then dispersed and transmitted, and further condensed by the second light condensing structure 40 , The detection beam is used to acquire biometric information of the external object 1000 .

Here, the biometric detection apparatus 70 corresponds to the biometric detection apparatus 30 in the foregoing embodiments, and related implementation may refer to the relevant descriptions of the foregoing embodiments, which are not repeated here for brevity.

In some embodiments of the present application, as shown in FIG. 15 , the biometric detection device 70 further includes: a detection light source 71 for providing a detection beam required for biometric information detection;

The detection light beam emitted by the detection light source 71 returns from the external object 1000 above the LCD display device, passes through the display panel, and then enters the backlight module 20 , and passes through the first backlight module 20 . A light condensing structure 210 is refracted, dispersed and transmitted, and then further converged by the second light condensing structure, and finally incident on the photosensitive surface of the image sensor 72 .

The detection beam is invisible light. For example, the detection beam may be near-infrared light having a wavelength in the range of 780 nanometers to 2000 nanometers. More specifically, the wavelength of the detection beam may be 850 nanometers or 940 nanometers. Then the detection light source may be an infrared light source.

Optionally, in some embodiments of the present application, the detection light source 71 is integrated in the backlight module. More specifically, the detection light source and the backlight light source in the backlight module may be integrated. For example, the detection light source and the backlight light source are arranged in parallel and integrated. In other alternative embodiments, the detection light source and the backlight light source may also be integrated in a non-parallel manner. This embodiment of the present application does not specifically limit this.

Further, in some embodiments of the present application, the biometric detection device 70 further includes:

A filter (not shown in the figure), which can be arranged between the backlight module and the photosensitive surface of the image sensor, and is used to filter out the light signal in the wavelength band not used for biometric detection, thereby , the visible light to be transmitted to the image sensor can be filtered out by setting a filter, which can further improve the accuracy of biometric detection.

In the embodiment of the present application, the optical filter may specifically be used to filter out wavelengths of visible light, for example, visible light used for image display, and the like. The filter may in particular comprise one or more optical filters, which may be configured, for example, as band-pass filters to filter out light emitted by visible light sources, while not filtering out infrared light signals . 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.

In some embodiments, the biometric detection device 70 is a fingerprint detection device for detecting fingerprint information from an external object above the LCD display device.

The above-described LCD display device may also be referred to as an LCD panel.

As shown in FIG. 16 , an embodiment of the present application further provides an electronic device 200 , including an under-screen biometric detection system 80 . The under-screen biometric detection system 80 includes an LCD screen 81. The LCD screen 81 may be the LCD screen 60 shown in FIG. 14. For specific implementation, reference may be made to the relevant descriptions of the foregoing embodiments, which are not repeated here for brevity.

Further, the electronic device 200 may further include: a biometric detection device 82, and the biometric detection device 82 may be, for example, the biometric detection device 30 in the embodiments shown in FIG. 6 to FIG. 13 or the biometric detection device in FIG. 15 . For the specific implementation of the detection apparatus 70, reference may be made to the relevant descriptions of the foregoing embodiments, which are not repeated here for brevity.

The biometric detection device 82 is configured to receive the detection light beam emitted by the detection light source used for biometric detection to illuminate the external object and pass through the backlight module in the LCD screen, and the detection light beam is used to detect the external object. biometric information.

The electronic device 200 in this embodiment of the present application may include, but is not limited to, a smart phone, a tablet computer, a computer, a notebook computer, a smart wearable device, a smart door lock, and the like. In order to implement the basic functions of the electronic device 200, in addition to the modules or components exemplified below, the electronic device 200 in this embodiment of the present application may also include other necessary modules or components. Taking the electronic device 200 as a smart phone as an example, it may also include a communication module, a speaker, a microphone, a battery, and the like.

It should be noted that, when there are multiple second light concentrating structures 40 , the above-mentioned first light concentrating structures 210 and second light concentrating structures 40 are both elongated structures. In particular, when the second light concentrating structure 40 is a second arc-shaped convex structure and is the structure of the light guide plate 200 itself, the second light concentrating structure 40 and the dot structure on the light guide plate 200 are parallel to each other. Are not the same.

In addition, the backlight module 20 of the above-mentioned embodiments of the present application may further include a diffusion sheet and a light enhancement sheet, and the diffusion sheet and the light enhancement sheet are disposed between the light guide plate 200 and the display panel. Wherein, the diffusion sheet is, for example, disposed between the light enhancement sheet and the light guide plate 200, and may also be disposed between the display panel and the light enhancement sheet.

It should be understood that the upper surface, lower surface, light-emitting surface, light-incident surface, light-emitting surface, etc. that may appear in the description of this application may be actual solid surfaces or imaginary surfaces, and will not affect the technical solutions of the invention and creation of this application. The realization all belong to the protection scope of the present application. In addition, "overlap", "coincidence" and "overlapping" that may appear in the description of this application should be understood as having the same meaning and can be replaced with each other.

Those skilled in the art can understand that, without creative work, part or all of the embodiments of the present application, as well as some or all of the deformations, replacements, changes, splits, combinations, expansions, etc. of the embodiments should be considered as Covered by the inventive idea of the present application, it belongs to the protection scope of the present application.

Any reference in this application to "one embodiment," "an embodiment," "an example embodiment," etc. means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. The appearances of such phrases in various places in this specification are not necessarily all referring to the same embodiment. Additionally, when a particular feature or structure is described in conjunction with any embodiment, it is claimed that it is within the skill of those skilled in the art to implement such feature or structure in conjunction with other embodiments of those embodiments.

"Length", "width", "upper", "lower", "left", "right", "front", "rear", "back", "front", "vertical" may appear in the specification of this application "," "horizontal", "top", "bottom", "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the embodiments of the present application and The description is simplified rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the application. Like numerals and letters refer to like items in the figures, so once an item is defined in one figure, no further definition and explanation are required in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of this application, "plurality" or "plurality" means at least two or two, unless expressly and specifically defined otherwise. In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, "arrangement", "installation" and "connection" should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrally connected; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or the internal communication between the two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood in specific situations.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. The terms used in the claims should not be construed to limit the invention to the specific embodiments disclosed in this specification. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims (11)

1. The utility model provides a biological characteristic detecting system under screen, includes the luminous display device of passive form and biological characteristic detection device, biological characteristic detection device is used for setting up in the luminous display device below of passive form in order to realize that biological characteristic detects under the screen, the luminous display device of passive form includes display panel and backlight unit, backlight unit sets up the below of display panel, display panel is used for the display screen, backlight unit is used for display panel realizes that the picture shows provides visible light, its characterized in that, backlight unit includes:

the display panel comprises a light guide plate and a light source, wherein the light guide plate comprises an upper surface and a lower surface which are oppositely arranged, the upper surface of the light guide plate is the surface of one side, facing the display panel, of the light guide plate, the lower surface of the light guide plate is the surface of one side, facing away from the display panel, of the light guide plate, the side, facing the display panel, of the light guide plate is provided with a first light condensation structure extending towards the display panel, the upper surface of the light guide plate comprises the surface of the first light condensation structure, and the first light condensation structure is used for condensing light rays emitted from the interior of the light guide plate to the; a second light condensing structure is arranged in an optical path from the lower surface of the light guide plate to the light sensing surface of the biological characteristic detection device, and the second light condensing structure is used for condensing light rays emitted from the lower surface of the light guide plate;

the biometric detection device includes:

and the image sensor is used for receiving the detection light beams returned from the external object above the passive light-emitting display device through the passive light-emitting display device, wherein the detection light beams returned from the external object are transmitted dispersedly after passing through the first light-focusing structure, the detection light beams transmitted dispersedly are converged after passing through the second light-focusing structure, and the detection light beams converged by the second light-focusing structure are used for the biological characteristic detection device to acquire the biological characteristic information of the external object.

2. The underscreen biometric detection system according to claim 1, wherein the first light gathering structure and the second light gathering structure are both prism structures and are disposed opposite to each other; or

The first light gathering structure and the second light gathering structure are both arc-shaped protruding structures and are arranged in a back-to-back mode.

3. The system according to claim 1 or 2, wherein the first light collecting structure comprises a plurality of first prisms arranged in parallel, and the second light collecting structure comprises a plurality of second prisms arranged in parallel, wherein the plurality of first prisms and the plurality of second prisms are arranged opposite to each other and opposite to each other; or

The first light-gathering structure comprises a plurality of first prisms which are arranged in parallel, the second light-gathering structure comprises a single third prism, and the plurality of first prisms and the third prism are arranged in an opposite mode; or

The first light gathering structure comprises a plurality of first arc-shaped protruding structures which are arranged in parallel, the second light gathering structure comprises a plurality of second arc-shaped protruding structures which are arranged in parallel, and the plurality of first arc-shaped protruding structures and the plurality of second arc-shaped protruding structures are arranged opposite to each other one by one and are opposite to each other; or

The first light gathering structure comprises a plurality of first arc-shaped protruding structures which are arranged in parallel, the second light gathering structure comprises a single third arc-shaped protruding structure, and the plurality of first arc-shaped protruding structures and the third arc-shaped protruding structures are arranged in a back-to-back mode.

4. The off-screen biometric detection system of claim 3, wherein the first and second prisms disposed opposite one another are identical prisms; or

The first prism and the third prism are similar in shape, and the third prism is larger in size than the first prism.

5. The off-screen biometric detection system of claim 4, wherein the third prisms are sized such that light exiting the lower surface of the light guide plate within a field of view of the biometric detection device is each focused.

6. The system according to claim 3, wherein the first plurality of parallel-arranged arc-shaped protrusions are a plurality of first lenses, the second plurality of parallel-arranged arc-shaped protrusions are a plurality of second lenses, the focal points of the first and second lenses which are opposite to each other coincide, and the ratio of the diameters of the first and second lenses is the ratio of the focal lengths of the first and second lenses.

7. The off-screen biometric detection system of claim 3, wherein the plurality of first prisms are triangular prisms, the third prisms are triangular prisms, and the first and third prisms are at equal apex angles and are oppositely oriented.

8. The system of claim 1, wherein the backlight module further comprises:

and the reflecting sheet is arranged below the lower surface of the light guide plate, and the second light condensing structure is arranged on the lower surface of the reflecting sheet.

9. The system of claim 8, wherein the second focusing structure is disposed on the entire area of the lower surface of the reflective sheet or on a partial area of the lower surface of the reflective sheet, wherein the partial area is an area opposite to the lower surface of the reflective sheet where the field of view of the biometric detection device is located.

10. The system of claim 1, wherein the backlight module further comprises:

the metal reinforcing plate is arranged below the reflector plate, an opening is formed in the metal reinforcing plate, the biological characteristic detection device is arranged below the opening, and the second light condensation structure is arranged below the opening area.

11. The underscreen biometric detection system according to claim 1, wherein the second light concentrating structure is disposed at a localized area of the lower surface of the light guide plate; or a local part of one side of the light guide plate, which is opposite to the display panel, extends out of the second light concentrating structure, and the lower surface of the light guide plate comprises the lower surface of the second light concentrating structure; the local area is an area where the view field of the biological feature detection device is over against the lower surface of the light guide plate.

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