CN210155680U

CN210155680U - Detection module, display device and electronic equipment

Info

Publication number: CN210155680U
Application number: CN201920374816.9U
Authority: CN
Inventors: 朱文龙; 林峰
Original assignee: Shenzhen Fushi Technology Co Ltd
Current assignee: Shenzhen Fushi Technology Co Ltd
Priority date: 2019-03-23
Filing date: 2019-03-23
Publication date: 2020-03-17
Anticipated expiration: 2029-03-23

Abstract

The utility model discloses a detection module, which comprises an emitting unit, a detecting unit and a detecting unit, wherein the emitting unit is used for emitting a detecting light beam, and the detecting light beam can be used for detecting the biological characteristic information of an external object, or drawing an image of the external object, or detecting the space coordinate change of the external object; the light guide unit comprises a side surface and an upper surface which are connected, and is used for the detection light beam to enter the light guide unit from the side surface and to be emitted from the upper surface in a divergent mode; and the receiving unit is arranged below the light guide unit and used for receiving the detection light beam reflected by the external object through the light guide unit. The utility model also discloses a display device and electronic equipment including above-mentioned detection module. The utility model discloses better visual effect has.

Description

Detection module, display device and electronic equipment

Technical Field

The utility model relates to the field of photoelectric technology, especially, relate to a detect module, display device and electronic equipment.

Background

With the technical progress and the improvement of living standard of people, users demand more functions and fashionable appearance for electronic products such as mobile phones, tablet computers, cameras and the like. At present, the development trend of mobile phones is that the mobile phones are light and thin, are close to a full screen, and have functions of self-shooting by a front camera, face recognition and the like. As the functions supported by the electronic device become more and more abundant, the number of elements to be set becomes more and more, and a part of the display area on the front side of the electronic device needs to be occupied, which affects the appearance and user experience.

Recently, in order to achieve a full screen or nearly full screen effect, a technology of detecting biological features under a screen has come into use, that is, a biological feature detection module is placed below a display screen, and biological feature detection is achieved by sending or receiving detection light beams through the display screen. However, for non-self-emissive types of display screens, such as liquid crystal display screens, the under-screen biometric detection needs to address the screen's problem with respect to the detection beam transmittance. Some manufacturers have proposed placing the biometric detection module under the backlight module and tapping the entire display screen and backlight module. Although the scheme can realize the detection of the biological characteristics under the screen, the relatively complex process is needed, the product cost is higher, and the holes are needed on the screen and the backlight module, so that the visual effect of the whole display of the screen is poorer.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a be used for under-screen detection module, display device and electronic equipment for solving prior art problem.

One aspect of the utility model discloses a detection module, including the transmitting element, be used for launching the measuring beam, the measuring beam can be used for detecting external object biological characteristic information, or draw the image of external object, or detect external object space coordinate change; the light guide unit comprises a side surface and an upper surface which are connected, and is used for the detection light beam to enter the light guide unit from the side surface and to be emitted from the upper surface in a divergent mode; the receiving unit is arranged below the light guide unit and used for receiving the detection light beams reflected by the external object through the light guide unit, the light guide unit is provided with an opening corresponding to the receiving unit, the receiving unit receives the detection light beams reflected by the external object through the opening, at least part of the receiving unit is positioned in the opening, and the detection light beams are one or more of infrared light, visible light, invisible light, electromagnetic waves and ultrasonic waves.

Optionally, the detection module can transmit and receive the detection beam through a display module, and the detection beam can be used for detecting the biological characteristics of the external object.

Optionally, the light guide unit includes a light guide layer, the emitting unit is disposed adjacent to one side of the light guide layer, the light guide layer has a first opening corresponding to the receiving unit, and a light shielding layer is disposed inside the first opening and can prevent the detection beam from penetrating through the light shielding layer.

Optionally, the light guide unit further includes a reflective layer disposed below the light guide layer, the reflective layer has a second opening corresponding to the receiving unit, the second opening is disposed inside the light shielding layer, the light shielding layer is made of opaque material, and the light shielding layer is disposed close to a backlight module disposed above the light guide unit and can be used for blocking the detection beam from directly entering the receiving unit without being reflected by an external object and reducing external stray light from entering the receiving unit.

Optionally, the reflective layer is configured to reflect a portion of the detection beam entering the light guide layer from the side of the light guide layer and exiting from the lower side of the light guide layer, and then enter the light guide layer.

An aspect of the utility model discloses a display device, including display module assembly and the detection module assembly of setting in the display module assembly below, display module assembly can launch the light beam in a poor light that is used for showing, it can see through to detect the module assembly display module assembly transmission with receive the measuring beam, it is foretell detection module assembly to detect the module assembly.

Optionally, the display module includes a display panel and a backlight module arranged below the liquid crystal display panel, the detection module is arranged below the backlight module, and a detection light beam emitted by the detection module sequentially penetrates through the backlight module and the display panel to exit to the outside, and is reflected by an external object and then sequentially penetrates through the display panel and the backlight module to reach the detection module.

An aspect of the present invention discloses an electronic device, which includes the above-mentioned detection module, or the above-mentioned backlight module, or the above-mentioned display device.

Compared with the prior art, the utility model discloses detect module, display device and electronic equipment and utilize and detect the module and see through the display module transmission and receive the measuring beam, detect the module and can launch the luminous measuring beam of even face to need not punch on the display module just can realize the detection and the discernment to outside object under the screen, have better whole visual effect and user experience simultaneously.

Drawings

Fig. 1 is a schematic view of an embodiment of the present invention;

fig. 2 is a schematic view of a diffusion sheet according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a transmittance curve of a reflective sheet according to an embodiment of the present invention;

fig. 4 is a schematic diagram of an embodiment of the present invention;

fig. 5 is a schematic diagram of an embodiment of the present invention.

Detailed Description

In the detailed description of the embodiments of the present invention, it is to be understood that when a substrate, a frame, a sheet, a layer, or a pattern is referred to as being "on" or "under" another substrate, another sheet, another layer, or another pattern, it can be "directly" or "indirectly" on the other substrate, the other sheet, the other layer, or the other 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 clarity. Further, the sizes of the elements in the drawings do not completely reflect actual sizes.

An embodiment of the present invention provides a detection module, including an emitting unit for emitting a detection beam, where the detection beam can be used to detect biological characteristic information of an external object, or to draw an image of the external object, or to detect a change in spatial coordinates of the external object; the light guide unit comprises a side surface and an upper surface which are connected, and is used for the detection light beam to enter the light guide unit from the side surface and to be emitted from the upper surface in a divergent mode; and the receiving unit is arranged below the light guide unit and used for receiving the detection light beam reflected by the external object through the light guide unit. The detection module can be passed through a display module transmission and receive the detection light beam, the detection light beam can be used to the biological characteristics of external object and detect. The light guide unit is of a flat structure and is provided with an opening corresponding to the receiving unit, and the receiving unit receives the detection light beam reflected by the external object through the opening. The light guide unit comprises a light guide layer, the emitting unit is arranged close to one side face of the light guide layer, the light guide layer is provided with a first opening corresponding to the receiving unit, and a light shielding layer is arranged on the inner side of the first opening and can prevent the detection light from penetrating through the light shielding layer.

The light guide unit further comprises a reflecting layer arranged below the light guide layer, the reflecting layer is provided with a second opening corresponding to the receiving unit, the light shielding layer is arranged on the inner side of the second opening and made of opaque materials, the light shielding layer is tightly attached to a backlight module arranged above the light guide unit and can be used for blocking the detection light beam from directly entering the receiving unit without being reflected by an external object and reducing external stray light from entering the receiving unit.

In this embodiment, the reflective layer is configured to reflect a portion of the detection beam that enters the light guide layer from the side surface of the light guide layer and exits from the lower side of the light guide layer, and then enters the light guide layer. The receiving unit is at least partially positioned within the aperture. The detection light beam is one or more of infrared light, visible light, invisible light, electromagnetic waves and ultrasonic waves.

An embodiment of the utility model also provides a display device, including display module assembly and the detection module assembly of setting in the display module assembly below, display module assembly can launch the backlight beam who is used for showing, it can see through to detect the module assembly display module assembly transmission with receive the measuring beam, it is foretell detection module assembly to detect the module assembly.

In this embodiment, the display module assembly includes display panel and sets up the backlight unit of liquid crystal display panel below, it sets up to detect the module assembly the backlight unit below, the detection light beam that detects the module assembly transmission sees through in proper order backlight unit, display panel exit to the outside to see through in proper order after being reflected by external object the display panel, backlight unit reachs detect the module assembly.

An embodiment of the present invention further provides an electronic device, which includes the above-mentioned detection module, or the above-mentioned display device.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1, in an embodiment of the present invention, a display device 1 includes a display module 20 and a detection module 10 disposed below or at the back of the display module 20. The detection module 10 can transmit and receive the detection light beam 101 through the display module 20.

In this embodiment, the detection module 10 can transmit a detection beam to the surface or outside of the display module 20 through the display module 20, and receive the detection beam reflected by the external object 1000 through the display module 20. The display module 20 can be used for displaying images and can provide a contact or non-contact human-computer interaction interface for a user.

The detection module 10 includes a light guide unit 11, a transmitting unit 12, and a receiving unit 13. The emitting unit 12 is disposed adjacent to the light guiding unit 11, and is configured to emit a detection light beam 101. The light guiding unit 11 comprises a side surface (not numbered) and an upper surface (not numbered) which are connected, and is used for enabling the detection light beam 101 to enter the light guiding unit 11 from the side surface of the light guiding unit 11 and to be emitted divergently from the upper surface of the light guiding unit 11. The emission unit 12 is disposed adjacent to a side surface of the light guide unit 11. The receiving unit 13 is disposed at least below the light guiding unit 11 or partially disposed in the light guiding unit 11, and is configured to receive the detection light beam 101 reflected by the external object 1000 through the light guiding unit 11. The light guide unit 11 can change the radial detection light beam 101 emitted from the emission unit 12 into a uniform surface-emitting detection light beam 101.

After the detection light beam 101 emitted by the emitting unit 12 enters the light guide unit 11, part of the detection light beam 101 is reflected and/or refracted and then exits from the upper surface of the light guide unit 11 to the lower part of the display module 20, and can pass through the display module 20 to reach the outer surface of the display module 20 or the outside of the display module 20. The detection light beam 101 is reflected by the external object 1000 and then can be received by the receiving unit 13 through the display module 20 and the light guide unit 11.

In this embodiment, the detection light beam 101 can be used for two-dimensional and/or three-dimensional image rendering of an external object, or for two-dimensional and/or three-dimensional biometric recognition of an external object.

In this embodiment, the detection beam 101 is infrared light. In other modified embodiments, the detection beam 101 may also be visible light, invisible light, electromagnetic wave, ultrasonic wave, or ultraviolet lamp.

The light guide unit 11 has a substantially flat plate-shaped structure, and has an opening corresponding to the receiving unit 13, and the receiving unit 13 receives the detection light beam 101 reflected by the external object 1000 through the opening 114. Specifically, the light guide unit 11 includes a light guide layer 111 and a reflective layer 112 disposed below the light guide layer 111, the emitting unit 12 is disposed adjacent to one side surface (not numbered) of the light guide layer 111, the light guide layer 111 has a first opening (not numbered) corresponding to the receiving unit 13, the reflective layer 112 has a second opening (not numbered) corresponding to the receiving unit 13, the first opening and the second opening together form the opening 114, a light shielding layer 113 is disposed inside the opening 114, and the light shielding layer 113 can prevent the detection light 101 from passing through. In this embodiment, the receiving unit 13 is at least partially located within the opening 114. In other or alternative embodiments, the receiving unit 13 may be partially disposed below the reflective layer 112, or the receiving unit 13 may be entirely disposed within the opening 114.

In a modified embodiment of the above embodiment, the light guide unit 11 further includes a Diffusion Sheet (Diffusion Sheet) disposed on the light guide layer 111 for diffusing the detection light beam 101 and/or a Prism Sheet (Prism Sheet) for increasing the brightness of the detection light beam 101 within a detection range corresponding angle. The detection range corresponds to an angle such as, but not limited to, 60 degrees from the normal of the prism sheet.

In this embodiment, the apertures of the first opening and the second opening are different in size, the aperture of the first opening is smaller than the aperture of the second opening, and the light shielding layer 113 covers a step surface formed at a joint of the first opening and the second opening due to the aperture difference.

In this embodiment, the emitting unit 112 may include one or more light emitting elements, such as but not limited to a Light Emitting Diode (LED), a Vertical Cavity Surface emitting laser (Vertical Cavity Surface emitting laser), or other light emitting devices. The receiving unit 13 may comprise an infrared image sensor capable of receiving infrared light beams and converting them into corresponding electrical signals. In other or modified embodiments, the receiving unit 13 may include a visible light image sensor, or other types of photoelectric conversion chips.

The transmitting unit 12 and the receiving unit 13 shown in fig. 1 are schematic representations only, and do not represent any limitation of the transmitting unit 12, the receiving unit 13, and the shape, structure, and positional relationship therebetween.

In other or modified embodiments of the present invention, the aperture of the first opening and the second opening may be the same, or the aperture of the first opening is larger than the aperture of the second opening.

The display module 20 includes a display panel 21 and a backlight module 22 disposed below the display panel 21. The display panel 21 can be used for image display, and the backlight module 22 can provide the display panel 21 with a backlight beam for image display. In this embodiment, the backlight beam is, for example, but not limited to, visible light.

The display panel 21 includes a panel layer 211 and a protective layer 212 disposed on the panel layer. The backlight module 22 includes a light guide plate 222, a reflective sheet 221 disposed below the light guide plate 222, a diffusion sheet 223 disposed above the light guide plate 222, and a backlight source 224 disposed adjacent to a side surface of the light guide plate 222. The detection module 10 is disposed below the reflective sheet 221. The display panel 21 is disposed above the diffusion sheet 223. The backlight light source 224 is used for providing a backlight beam required for image display to the display panel 21. The light guide plate 222 includes a light exit surface (not numbered) opposite to the diffusion sheet 223 and a light entrance surface (not numbered) connected to the light exit surface, and the light guide plate 222 is configured to receive the backlight beam from the backlight source 224 from the light entrance surface and emit the backlight beam from the light exit surface. The reflective sheet 221 is used for reflecting a part of the backlight beam emitted from the bottom of the light guide plate 222 into the light guide plate 222 and transmitting the detection beam 101. The diffusion sheet 223 is used for diffusing the backlight beam emitted from the light-emitting surface of the light guide plate 222, so that the backlight beam enters the display panel 21 more uniformly and divergently.

In this embodiment, the light shielding layer 113 is disposed close to the reflective sheet 221, so that the detection beam 101 can be effectively prevented from directly entering the receiving unit 13 from the emitting unit 12, and external stray light and interference of reflected light from the display panel 21 and the reflective sheet 221 can be reduced.

In this embodiment, the diffusion sheet 223 includes one of a quantum dot film, a nano porous film, polyethylene terephthalate, or other polyester compounds.

Referring to fig. 2, when the diffusion sheet 223 includes a quantum dot film, the diffusion sheet 223 includes a base 2231 and a plurality of quantum dots 2232 disposed in the base 2231. The backlight light beam provided by the backlight light source 224 may be blue light, a portion of which can be converted by the quantum dots 2232 in the quantum dot film into red light and green light, which can be mixed to form white light, which can be used for image display of the display panel 21. In a modified embodiment of this embodiment, the backlight light sources 224 can emit ultraviolet light, the diffusion sheet 223 can convert the ultraviolet light from the backlight light sources 224 into red light, green light, and blue light, and the converted red light, green light, and blue light can be mixed into white light and supplied to the display panel 21 for image display.

As shown in fig. 2, in the present embodiment and the modified embodiments, the diffusion sheet 223 has a better transmittance for the detection light beam 101, for example, but not limited to, when the detection light beam 101 is infrared light, the transmittance of the diffusion sheet 223 for the detection light beam 101 is greater than 50%.

In this embodiment, the panel layer 211 includes two substrates disposed opposite to each other and a liquid crystal layer disposed between the two substrates. The display panel 21 is a liquid crystal display panel. The protective layer 212 is a cover glass. The display panel 21 can transmit the detection light beam 101, and the substrate, the liquid crystal layer and the cover glass of the display panel 21 have better transmittance for the detection light beam 101.

In this embodiment, the reflective sheet 221 can reflect visible light and transmit the detection beam 101. For example, but not limiting of, the reflective sheet 221 is formed by a stack of multilayer optical films having different refractive indices for the detection beam 101 and visible light, the reflective sheet having a reflectance of greater than 90% for visible light, a transmittance of less than 0.1% for visible light, and a transmittance of greater than 90% for the detection beam 101 by optical modulation. Preferably, the detection light beam is infrared light, and the reflectivity of the reflection sheet 221 to visible light is greater than 90%, and the transmissivity to infrared light is greater than 90%.

Referring to fig. 3, in an embodiment of the present invention, the transmittance of the reflective sheet 221 to infrared light with a wavelength of 900nm to 1000nm is greater than 90%, and the transmittance to visible light is less than 0.1%.

In the embodiment or the modified embodiment, the detection light beam 101 may include one or more of flood light (flood light, light beam that the illumination area of flood light finger is wider and the illumination angle is divergent), speckle structured light, coded structured light, and modulation pulse signal.

Please refer to fig. 4, which is a schematic diagram of an embodiment of the display device 1 shown in fig. 1. In this embodiment, the receiving unit 13 and the transmitting unit 12 are disposed below the display module 20 adjacent to the bottom of the display module 20. The emitting unit 12 emits the detection light beam 101, which is reflected by the external object after passing through the display module 20, and passes through the display module 20 again to be received by the receiving unit 13, and can be used for detecting the biological characteristics of the external object, or drawing the image of the external object, or detecting the spatial coordinate changes such as the motion or distance of the external object.

Please refer to fig. 5, which is a schematic diagram of an embodiment of the display device 1 shown in fig. 1. In this embodiment, the transmitting unit 12 is disposed below the display module 20 adjacent to the bottom of the display module 20. The number of the receiving units 13 is two, and the receiving units 13 are arranged below the display module 20 adjacent to the top of the display module 20. In the present embodiment, the two receiving units 13 are capable of receiving the detection light beams 101 reflected by the external object 1000, respectively, and obtaining three-dimensional biometric information of the external object 1000 through Binocular Stereo Vision (Binocular Stereo Vision), or drawing a three-dimensional image of the external object, or detecting a change in coordinates such as a direction and a distance of the external object in a three-dimensional space.

In the above embodiment or the modified embodiment, the detection module 20 may further include a processor (not shown), and the processor may obtain the two-dimensional information and/or the depth information of the external object 1000 according to the detection beam 101 received by the receiving unit 13. Further, the processor also stores the biometric information data in advance, and the processor can detect and identify the biometric information of the external object by comparing the obtained two-dimensional information and/or depth information of the external object 1000 with the biometric information data stored in advance, such as but not limited to: fingerprint recognition, face recognition, iris recognition, and the like.

By detecting and identifying the biological characteristics of the external object 1000, the detection module 10 can be applied to various products and application scenarios such as locking or unlocking of the display device 1, online payment service verification, authentication of a financial system or a public security system, passage verification of an access control system, and the like.

Therefore, the display device 1 can be used for two-dimensional and/or three-dimensional biometric detection and recognition of an external object, or for two-dimensional and/or three-dimensional image rendering of an external object, or for two-dimensional and/or three-dimensional spatial coordinate detection of an external object.

In the embodiments and variations of the present invention, the external object 1000 includes, but is not limited to, a finger (fingerprint), an iris, a face, and the like.

In the above or modified embodiments of the present invention, the positions and the numbers of the transmitting unit 12 and the receiving unit 13 may have different settings, which is not limited by the present invention.

The utility model also provides a detection module, detection module includes above-mentioned detection module 10 or its change embodiment, and it can be used to display device 1 or its change embodiment.

The utility model also provides a backlight module, backlight module can arrange above-mentioned detection module group and use. The backlight module includes the backlight module 22 or its modified embodiment, which can be used in the display device 1 or its modified embodiment.

The utility model also provides an electronic equipment, electronic equipment includes above-mentioned display device 1 or its modified embodiment. The electronic device may be a mobile phone, a tablet computer, a smart watch, an augmented reality/virtual reality device, a human action detection device, an autonomous vehicle, a smart home device, a security device, an intelligent robot or other electronic devices having a biometric identification capability for objects.

Compared with the prior art, the utility model discloses detect module 10, display device 11 and electronic equipment and utilize and detect module 10 and pass through display module group transmission and receipt measuring beam 101 detect module 10 and have the structure that can provide the luminous measuring beam 101 of even face. Thereby need not punch on display module assembly 20 just can realize detection and discernment to outside object 1000 under the screen, have better whole visual effect and user experience simultaneously.

It should be noted that, those skilled in the art can understand that, without creative efforts, some or all of the embodiments of the present invention, and some or all of the deformation, replacement, alteration, split, combination, extension, etc. of the embodiments should be considered as covered by the inventive idea of the present invention, and belong to the protection scope of the present invention.

Any reference in this specification to "one embodiment," "an embodiment," "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 invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature or structure is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature or structure in connection with other ones of the embodiments.

The references to "length", "width", "upper", "lower", "front", "rear", "back", "front", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. as used herein are intended to refer to the orientation or positional relationship shown in the drawings, and are intended to facilitate the description of the embodiments and to simplify the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention. Like reference numbers and letters refer to like items in the figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance. In the description of the present invention, "plurality" or "a plurality" means at least two or two unless specifically defined otherwise. In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, "disposed," "mounted" or "connected" is to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. The terms used in the following claims should not be construed to limit the invention to the specific embodiments disclosed in the specification. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A detection module, comprising:

an emitting unit for emitting a detection beam which can be used for detecting the biological characteristic information of the external object, or drawing the image of the external object, or detecting the space coordinate change of the external object;

the light guide unit comprises a side surface and an upper surface which are connected, and is used for the detection light beam to enter the light guide unit from the side surface and to be emitted from the upper surface in a divergent mode;

the receiving unit is arranged below the light guide unit and used for receiving the detection light beams reflected by the external object through the light guide unit, the light guide unit is provided with an opening corresponding to the receiving unit, the receiving unit receives the detection light beams reflected by the external object through the opening, at least part of the receiving unit is positioned in the opening, and the detection light beams are one or more of infrared light, visible light, invisible light, electromagnetic waves and ultrasonic waves.

2. The detection module according to claim 1, wherein the detection module is capable of emitting and receiving the detection light beam through a display module, and the detection light beam is capable of being used for biometric detection of an external object.

3. The detecting module according to claim 1, wherein the light guiding unit includes a light guiding layer, the emitting unit is disposed adjacent to a side of the light guiding layer, the light guiding layer has a first opening corresponding to the receiving unit, and a light shielding layer is disposed inside the first opening and can prevent the detecting beam from passing through the light shielding layer.

4. The detecting module as claimed in claim 3, wherein the light guiding unit further includes a reflective layer disposed under the light guiding layer, the reflective layer has a second opening corresponding to the receiving unit, the light shielding layer is disposed inside the second opening and is made of opaque material, and the light shielding layer is disposed close to a backlight module above the light guiding unit and is capable of blocking the detecting beam from directly entering the receiving unit without being reflected by an external object and reducing external stray light from entering the receiving unit.

5. The detecting module according to claim 4, wherein the reflecting layer is configured to reflect a portion of the detecting beam entering the light guiding layer from a side of the light guiding layer and exiting from below the light guiding layer, and then entering the light guiding layer.

6. A display device is characterized by comprising a display module and a detection module arranged below the display module, wherein the display module can emit backlight beams for displaying, the detection module can transmit and receive detection beams through the display module, and the detection module is the detection module according to any one of claims 1-5.

7. The display device according to claim 6, wherein the display module comprises a display panel and a backlight module disposed below the display panel, the detection module is disposed below the backlight module, and the detection light beam emitted by the detection module sequentially exits to the outside through the backlight module and the display panel, and is reflected by an external object and then sequentially reaches the detection module through the display panel and the backlight module.

8. An electronic device, comprising the detection module according to any one of claims 1 to 5 or the display device according to claim 6 or 7.