CN110376780A - Shield lower detection system, liquid crystal display device and backlight module - Google Patents

Abstract

The invention discloses an under-screen detection system, which includes a display device and a detection module. The detection module can receive a detection beam from an external object through at least part of the display device and convert it into an electrical signal. The display device includes a backlight module. group, a display panel and a protective cover, the backlight module includes a light guide plate, a first light source and a second light source. The first light source includes a plurality of first light emitting units for emitting backlight beams to the side of the light guide plate. The second light source is located below the first light source, and the second light source is used to emit a detection beam toward the top of the protective cover, and the detection beam can pass through the plurality of first light emitting units themselves and/or among the plurality of first light emitting units between the gaps, and the protective cover reaches external objects. The detection beam is used for biometric detection of an external object, and the wavelength of the detection beam is different from that of the backlight beam. The invention has better off-screen detection effect and better user experience.

Description

Under-screen detection system, liquid crystal display device and backlight module

technical field

The invention relates to the field of optoelectronic technology, in particular to an under-screen detection system, a display device and a backlight module.

Background technique

With the advancement of technology and the improvement of people's living standards, users require more functions and stylish appearances for electronic products such as mobile phones, tablet computers, and cameras. At present, the development trend of mobile phones is to have a higher screen-to-body ratio and have functions such as front camera Selfie and face recognition. As the functions supported by mobile phones become more and more abundant, the number of components that need to be set is also increasing, and it needs to occupy a part of the display area, which affects the appearance and user experience.

Recently, in order to achieve a full-screen or near-full-screen effect, it is expected to place a light source emitting a detection beam and a detection module inside or below the display device to achieve detection and identification under the screen. However, the prior art cannot solve the problem of how to transmit and receive the detection beam through the display device.

Contents of the invention

In view of this, the present invention provides an under-screen detection system, a liquid crystal display device and a backlight module that can be used for under-screen biometric detection or other detections to solve the problems in the prior art.

One aspect of the present invention provides an under-screen detection system, including a display device and a detection module, the detection module can receive a detection beam from an external object through at least part of the display device and convert it into an electrical signal, so that The display device includes a backlight module, a display panel, and a protective cover that are sequentially arranged from bottom to top. The backlight module includes: a light guide plate, including a top surface and a bottom surface that are oppositely arranged, and a The side in between; the first light source, including a plurality of first light emitting units adjacent to the side of the light guide plate, the plurality of first light emitting units are connected to each other or at least part of the adjacent first light emitting units have intervals between them, The plurality of first light-emitting units are used to emit backlight beams to the side, and the backlight beams enter the light guide plate from the side surfaces and exit from the top surface of the light guide plate to the display panel for providing The display panel realizes image display and provides a visible light beam; a second light source is located below the first light source, and the second light source is used to emit a detection light beam toward the top of the protective cover, and the detection light beam can pass through The plurality of first light-emitting units themselves and/or the intervals between the plurality of first light-emitting units, and the protective cover plate reach external objects, the detection light beam is used for biometric detection of external objects, the The wavelength of the detection beam is different from the wavelength of the backlight beam.

In some embodiments, the detection module is disposed under the backlight module at least partly corresponding to the display area of the display device; or, the detection module is at least partly located inside the display device, located on the display The inside of the device includes: the detection module is at least partially located on the side of the backlight module, and/or the detection module is at least partially located on the side of the display panel, and/or the detection module is at least partially located on the side of the display panel. One side of the protective cover, and/or the detection module is at least partially located under the protective cover, and/or the detection module is at least partially located between the protective cover and the display panel, and/or The detection module is at least partially located between the display panel and the backlight module.

In some embodiments, the second light source is at least directly facing the plurality of first light emitting units themselves, and/or is disposed in a space area between adjacent first light emitting units.

In some embodiments, when at least some of the plurality of first light emitting units are arranged at intervals, the interval between adjacent first light emitting units is at least 1 mm.

In some embodiments, the backlight module further includes a reflective sheet, which is located under the light guide plate and the first light source, and the backlight beam emitted from the bottom surface of the light guide plate can be reflected back to the light source by the reflective sheet. Inside the light guide plate; the second light source faces the first light source and is located under the reflective sheet, the detection beam can pass through the reflective sheet, the intervals between the plurality of first light emitting units, the The display panel and the protective cover plate reach the external object, and the detection light beam is used for biometric detection of the external object, wherein the wavelength of the detection light beam is different from that of the backlight light beam.

In some embodiments, the second light source has a light-emitting surface facing the reflective sheet, and the detection beam is emitted from the light-emitting surface.

In some embodiments, the reflection sheet has an opening facing the second light source, and the detection beam passes through the opening, or the reflection sheet can transmit the detection beam.

In some embodiments, the backlight module further includes a casing located under the reflective sheet, the casing accommodates the reflective sheet, the light guide plate and the first light source, and the second light source is located in the Below the housing, the housing can pass through the detection light beam; or, the housing has an opening, and the second light source is disposed directly below the housing, or the second light source is at least partly located In the opening, the detection light beam emitted by the second light source can pass through the housing through the opening and reach the reflection sheet.

In some embodiments, the backlight module further includes a middle frame located below the housing, and the second light source is fixed on the middle frame; or, the second light source is fixed to the housing; or , the second light source is fixed to the reflection sheet.

In some embodiments, the second light source is located above the middle frame; or, the middle frame has an opening or a groove corresponding to the second light source, and at least a part of the second light source is located at the opening or inside the groove.

In some embodiments, the backlight module further includes a middle frame located under the housing, and the second light source is connected to the middle frame by one or more methods of snapping, bolting, bonding, and welding. , and/or the reflection sheet, and/or the housing is fixedly or detachably connected.

In some embodiments, the second light source includes a second light emitting unit and a second circuit board electrically connected to the second light emitting unit, the second circuit board is located under the second light emitting unit, and the first The second circuit board is used to provide driving signals for the second light emitting unit, the backlight module further includes a middle frame located below the housing, the second light emitting unit and the second circuit board are located above the middle frame or, the middle frame has an opening or a groove corresponding to the second light emitting unit and the second circuit board, at least a part of the second light emitting unit or the second circuit board is located in the opening or the groove.

In some embodiments, the display device has a display area for displaying images and a non-display area located around the display area, the first light source is located in the non-display area of the display device, and the second light source is located in the non-display area of the display device. The non-display area of the display device.

In some embodiments, the backlight module further includes light-shielding glue disposed above the first light source, the light-shielding glue can block visible light, and: the light-shielding glue can transmit the detection beam, or, the light-shielding glue The light-shielding glue has an opening through which the detection light beam passes through the light-shielding glue, and the light-shielding glue can transmit or block the detection light beam.

In some embodiments, the first light source further includes a first circuit board electrically connected to the plurality of first light emitting units, and the first circuit board is used to provide driving for the plurality of first light emitting units. signal, the plurality of first light emitting units are disposed under the first circuit board in close contact with the first circuit board, and the detection light beam can pass through the first circuit board.

In some embodiments, the plurality of first light-emitting units are adjacent to the side of the light guide plate, the first circuit board is adjacent to the side of the light guide plate, or the light guide plate further includes a The transition surface of the surface, at least part of the first circuit board is located on the transition surface of the light guide plate, the transition surface includes a horizontal plane, and/or a slope surface, and/or an arc surface, and the light guide plate is on the top surface The thickness at the transition surface is less than or equal to the thickness of the light guide plate at the transition surface.

In some embodiments, the second light source includes a plurality of second light-emitting units, the plurality of second light-emitting units are arranged in a row at intervals, and the second light-emitting units are directly facing between adjacent first light-emitting units. The intervals are arranged under the reflective sheet, and the second light emitting unit is used to emit the detection light beam toward the protective cover.

In some embodiments, the second light-emitting unit is at least opposite to the middle position of the row in which the plurality of first light-emitting units are arranged.

In some embodiments, the second light emitting unit is electrically connected to an external drive circuit through a conductive medium, and the conductive medium includes conductive glue or wires; or, the second light source further includes a second circuit board, and the second circuit The board is located under the second light emitting unit, and the second circuit board is used to provide driving signals for the second light emitting unit.

In some embodiments, the backlight module further includes light-shielding glue disposed on the side of the first circuit board facing away from the first light-emitting unit, the light-shielding glue can block visible light, and: the light-shielding glue The glue can transmit the detection light beam, or the light-shielding glue has an opening through which the detection light beam passes through the light-shielding glue, and the light-shielding glue can transmit or block the detection light beam.

In some embodiments, the first light-emitting unit includes a first light-emitting surface facing the light guide plate, and the included angle between the backlight beam and the normal of the first light-emitting surface is not greater than 60 degrees; the second The light emitting unit includes a second light emitting surface parallel to the top surface of the light guide plate, and the included angle between the detection light beam and the normal of the second light emitting surface is not more than 60 degrees.

In some embodiments, the display panel includes a first substrate, a second substrate opposite to the first substrate, and a liquid crystal layer between the first substrate and the second substrate, the first substrate The protruding portion of the first substrate relative to the edge of the second substrate is a terminal area, the terminal area is located in the non-display area of the display device, and the first light source is directly opposite to the terminal area and located under the terminal area , the second light source is directly opposite to the first light source and located under the reflective sheet, and the terminal area can transmit the detection light beam.

In some embodiments, the display panel further includes a panel circuit board, one end of the panel circuit board is connected to the edge portion of the terminal area and is bent and extended to the bottom of the backlight module, and the panel circuit board has a The opening through which the detection beam passes, or the panel circuit board can transmit the detection beam, and the detection beam sequentially passes through the reflective sheet, the first light source, the terminal area, and the protective cover The plate shoots onto the external object.

In some embodiments, the display panel further includes an integrated circuit disposed on the terminal area, the detection light beam can pass through the part of the terminal area not covered by the integrated circuit, and the detection light beam in turn Through the reflection sheet, the first light source, the terminal area, the panel circuit board, and the protective cover, the light is emitted to an external object.

In some embodiments, the detection light beam includes near-infrared light.

In some embodiments, the display device further includes an optical coating on the lower surface of the protective cover, the optical coating corresponds to the non-display area of the display device, and the optical coating can transmit the The light beam is detected and the backlight or other visible light beam is intercepted.

In some embodiments, the backlight module further includes an optical film layer located above the light guide plate, and the optical film layer is used to diffuse and/or brighten the backlight beam emitted from the top surface of the light guide plate, The optical film layer can transmit the detection light beam.

In some embodiments, the protective cover has a lower surface opposite to the display panel and an upper surface facing away from the display panel, and the detection module has a first A field of view area, at least a part of the first field of view area is located in a display area of the display device.

In some embodiments, the detection module has a second field of view area on the top surface of the light guide plate, and the detection module receives the detection beam transmitted from the second field of view area; The backlight module further includes a light blocking film, the light blocking film is used to transmit the backlight light beam and intercept the detection light beam, at least a part of the light blocking film is located in the display area of the display device, or the light blocking film It is located above the area of the top surface of the light guide plate except the area of the second viewing field.

In some embodiments, the detection module is used to obtain the biological characteristics of the external object according to the converted electrical signal, and/or generate an image of the external object, and/or detect the spatial coordinates of the external object.

In some embodiments, the biological characteristics include one or more of fingerprints, iris, human face, palm prints, pulse, heart rate, blood flow rate and living body.

One aspect of the present invention provides a display device, including a stacked display panel and a backlight module, where the backlight module is the backlight module of the above-mentioned under-screen detection system.

In some embodiments, the display device further includes a protective cover, the display panel and the backlight module are located under the protective cover, the display panel includes a first substrate, and the first substrate The second substrate oppositely arranged, and the liquid crystal layer located between the first substrate and the second substrate, the protruding part of the first substrate relative to the edge of the second substrate is a terminal area, the An anti-reflection film is provided on the side of the terminal area facing away from the protection cover, the anti-reflection film is used to transmit the detection beam and prevent the detection beam from reflecting, and the protection cover can transmit the detection beam.

One aspect of the present invention provides a backlight module, which is the backlight module of the above-mentioned under-screen detection system, or the backlight module of the above-mentioned display device.

The beneficial effect of the present invention lies in that the under-screen detection system 1 of the present invention includes a second light source, and the second light source is directly opposite to the first light source and located below the first light source. The first light source provides a backlight beam for the display device to normally display images, and the second light source provides the detection module with a detection beam for off-screen detection. The detection light beam may be invisible light, and the detection light beam can pass through the display device. The detection light beam can be transmitted and received through the display device without affecting the normal image display of the display device. Therefore, the off-screen detection system can better realize off-screen detection of external objects, including but not limited to off-screen biological feature detection, image generation, spatial position detection, and the like. In addition, the second light source may be disposed under the reflective sheet, or under the housing. The second light source can also be connected to the middle frame. There is enough space under the reflector and the backlight module for accommodating the second light source, and the second light source uses the existing space of the display device to realize the setting of the light source for detecting the light beam without additionally occupying the display device. The space of the device has better practicability and applicability.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of an embodiment of the under-display detection system of the present invention;

Fig. 2 is a partial cross-sectional schematic diagram of the under-display detection system shown in Fig. 1;

Fig. 3 is a partial cross-sectional schematic view of the display device shown in Fig. 1;

Fig. 4 is a partial cross-sectional schematic diagram of a modified embodiment of the under-display detection system of the present invention;

Fig. 5 is a partial cross-sectional schematic diagram of a modified embodiment of the under-display detection system of the present invention;

Fig. 6 is a partial cross-sectional schematic diagram of a modified embodiment of the under-display detection system of the present invention;

Fig. 7 is a partial cross-sectional schematic diagram of a modified embodiment of the under-display detection system of the present invention;

Fig. 8 is a schematic partial cross-sectional view of a modified embodiment of the under-display detection system of the present invention.

Detailed ways

In the detailed description of the embodiments of the present invention, it should be understood that when a substrate, frame, sheet, layer or pattern is referred to as being "on" or "under" another substrate, another sheet, another layer or another pattern , it may be "directly" or "indirectly" on another substrate, another sheet, another layer or another pattern, or one or more intermediate layers may also be present. For the purpose of clarity, the thickness and size of each layer in the drawings of the specification may be exaggerated, omitted, or schematically represented. Also, the size of elements in the drawings does not utterly reflect an actual size.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Furthermore, 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 so that the embodiments of the present application can be fully understood. However, those skilled in the art should appreciate that the technical solutions of the present application can be practiced without one or more of the specific details, or with other structures, components, and the like. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the key points of the application.

Please refer to FIG. 1 . In an embodiment of the under-screen detection system 1 of the present invention, the under-screen detection system 1 includes a display device 10 . The display device 10 has a display area AA for displaying images and a non-display area NA surrounding the display area. Alternatively, the display area AA and the non-display area NA may also have other shapes or positional relationships, for example, but not limited to, the display device 10 has a display area on the back, and/or front, and/or sides AA and a non-display area NA; or the non-display area NA does not surround the display area AA. The embodiments of the present invention are not limited.

Please refer to FIG. 2 , which is a partial cross-sectional schematic diagram of the under-display detection system 1 along the line B-B in FIG. 1 according to an embodiment of the present invention. The display device 10 includes a backlight module 11 , a display panel 12 and a protective cover 13 arranged sequentially from bottom to top. The display panel 12 is used to display images, and the backlight module 11 is used to provide the display panel 12 with a backlight beam 100 required for image display. The protective cover 13 is used to protect the display panel 12 . The protective cover 13 can be made of transparent materials, such as but not limited to: glass or sapphire.

In this embodiment, the display device 10 further includes an optical coating 131 located on the lower surface of the protective cover 13 , and the optical coating 131 corresponds to a non-display area of the display device 10 . The optical coating 131 can transmit the detection beam 101 and intercept the backlight beam 100 or other visible beams. Optionally, the optical coating 131 is infrared ink, the detection beam 101 is near-infrared light, the backlight beam 100 is visible light, and the infrared ink is used to transmit near-infrared light and absorb visible light.

Optionally, in other or modified embodiments, the optical coating 131 may be omitted.

Optionally, in other or modified embodiments, the optical coating 131 may be integrated in the protective cover 13 .

The display device 10 further includes a middle frame 14 for accommodating at least a part of the backlight module 11 and the display panel 12 . The under-screen detection system 1 further includes a detection module 19 disposed under the backlight module 11 . The detection module 19 can receive the detection beam 101 reflected by the external object 1000 through the display device 10 , and/or the detection beam 101 transmitted by the external object 1000 . Wherein, the transmitting includes that the external object 1000 transmits the detection light beam 101 that enters its interior. The detection beam 101 reflected or transmitted by the external object 1000 carries the biometric information of the external object 1000 . The detection module 19 receives the detection light beam 101 reflected or transmitted by the external object 1000 and converts it into an electrical signal, which can be used for example but not limited to biometric detection of the external object 1000, and/or image generation, and/or Spatial position detection.

It should be noted that the biometric detection described in this application includes, but is not limited to, processes such as sensing of the external object 1000, information collection, feature data comparison, and identification result verification. Feature detection refers to at least being able to be used to implement or be used to help implement biometric feature detection.

It should be noted that, considering the display device 10 as a whole, the display area AA and the non-display area NA of the display device 10 shown in FIG. 1 may include the upper or lower space of their corresponding parts. For example but not limited to, the non-display area NA of the display device 10 refers to the area on the front of the display device 10 that is not used for image display and the space inside it that corresponds to the area that is not used for image display. The display panel 11 and the protective cover 13 also have a display area and a non-display area substantially corresponding to the display area AA and the non-display area NA, as shown in FIG. 2 . Moreover, the protective cover 13 serves as an outer surface component of the display device 10 , and the upper surface of the protective cover 13 can be regarded as the front of the display device 10 . Therefore, for the convenience of description, descriptions about the display area/non-display area of the display panel 11 , the protective cover 13 or other components may appear in the specification and claims of the present application. The display area of the display panel 11 is the area facing the display area AA, the non-display area of the display panel 11 is the area facing the non-display area NA, and so on, those skilled in the art can clearly understand.

In this embodiment, the middle frame 14 has an opening, and the detection module 19 is at least partially disposed in the opening. In other or modified embodiments, the middle frame 14 may not have holes, and the detection module 19 is arranged inside or below the middle frame 14 .

The display panel 12 and the protective cover 13 have better transmittance to the detection light beam 101 . It should be noted that the better transmittance is relative to the optical imaging effect when the detection light beam 101 received by the detection module 19 is used for biometric detection of the external object 1000 . The transmittance of the display panel 12 to the detection beam 101 is, for example but not limited to, approximately 50%, and the transmittance of the protective cover 13 to the detection beam 101 is, for example but not limited to, greater than 90%.

Optionally, optical glue or an optical film (not shown in FIG. 2 ) may be provided between the backlight module 11 , the display panel 12 and the protective cover 13 .

Optionally, in some embodiments, for example but not limited to, the detection module 19 is at least partially located inside the display device 10, and the inside of the display device 10 includes one side of the backlight module 11, and/or Or one side of the display panel 12, and/or one side of the protective cover 13, and/or the detection module 19 is at least partly located under the protective cover 13, and/or the detection module 19 At least partially located between the protective cover 13 and the display panel 12 , and/or the detection module 19 is at least partially located between the display panel 12 and the backlight module 11 .

In this embodiment, the backlight beam 100 and the detection beam 101 are beams of different wavelengths, wherein the backlight beam 100 is visible light, such as white light. The detection light beam 101 is invisible light, and the invisible light includes near-infrared light. The detection light beam 101 is, for example, near-infrared light. Exemplarily, the visible light includes light beams with a wavelength range of 400-700 nm (nanometers). The near-infrared light includes light beams with a wavelength range of 800-1000 nm. The detection light beam 101 is, for example, a light beam with a wavelength of 850 nm or 940 nm. The first light source 16 and/or the second light source 17 may include but not limited to one or more of the following light emitting elements: LED (light emitting diode), VCSEL (vertical cavity surface emitting laser), LD (laser diode), Mini-LED, Micro-LED, OLED (organic light-emitting diode), QLED (quantum dot light emitting diode), etc.

The backlight module 11 includes: a reflection sheet 112 , a light guide plate 113 , an optical film layer 114 , a first light source 16 and a second light source 17 . Wherein, the reflective sheet 112 , the light guide plate 113 , and the optical film layer 114 are stacked sequentially from bottom to top. The light guide plate 113 includes a top surface (not numbered) and a bottom surface (not numbered) disposed opposite to each other, and a side surface (not numbered) located between the bottom surface and the top surface.

The first light source 16 is used to emit a backlight beam 100 , and the backlight beam 100 passes through the light guide plate 113 and is provided to the display panel 12 in a surface-emitting manner. The display panel 12 realizes visible image display under the illumination of the backlight beam 100 . The second light source 17 is located below the first light source 16, and the second light source 17 is used to provide detection to a detection space through the first light source 16 and/or through a light guide structure (not shown). Beam 101. The detection beam 101 has a different wavelength than the backlight beam 100 . The detection beam 101 can be reflected or transmitted by an external object 1000 located in the detection space and return to the display device 10 . The detection module 19 can receive the returned detection light beam 101 and convert it into an electrical signal. Optionally, the light guide structure may be a light guide plate, a light guide pipe, an optical fiber, a solid light guide structure or a light guide structure with a cavity, etc., which is not limited in this embodiment of the present invention. After the detection beam 101 is emitted from the second light source, it can pass through the light guide structure and reach under the protection cover 13 , and then pass through the protection cover 13 to reach the external object 1000 . At this time, the detection beam 101 does not need to pass through the first light source 16 and the display panel 12 , which reduces the transmission loss of the detection beam 101 reaching the external object 1000 .

In this embodiment, the height of the first light source 16 is greater than the thickness of the light guide plate 113 at the top surface. In order to improve the utilization of the backlight beam 100 , the height of the side of the light guide plate 113 (or the thickness of the light guide plate 113 at the side) is greater than the thickness of the light guide plate 113 at the top surface. The side height of the light guide plate 113 is substantially equal to the height of the first light source 16 . There is a transition surface (not labeled) between the side surface and the top surface of the light guide plate 113 , and the transition surface makes the thickness of the light guide plate 113 gradually decrease. Since the thickness of the display area corresponding to the light guide plate 113 is relatively small, the display device 10 as a whole can be made relatively thin. The transition surface may be a slope surface or an arc surface, or the transition surface includes a horizontal surface, and/or a slope surface, and/or an arc surface.

It should be noted that this embodiment is described as an example. In other embodiments, the light guide plate 113, the first light source 16, and the second light source 17 may have other structures and settings, such as the top surface and the top surface of the light guide plate 113. The sides are connected and have a consistent thickness. This embodiment of the present invention does not limit it.

The first light source 16 is adjacent to the side surface and located on one side of the light guide plate 113 . The first light source 16 is used to emit a backlight beam 100 to the side, the backlight beam 100 enters the inside of the light guide plate 113 from the side, and exits from the top surface of the light guide plate 113 to the display panel 12 . The backlight beam 100 is used to provide a visible beam for the display panel 12 to realize image display.

The reflection sheet 112 is located below the light guide plate 113 and the first light source 16 . The backlight beam 100 emitted from the bottom surface of the light guide plate 113 can be reflected by the reflection sheet 112 and return to the inside of the light guide plate 113 .

The second light source 17 is directly opposite to the first light source 16 and disposed under the reflection sheet 112 . The second light source 17 has a light emitting surface (not numbered) facing the reflecting sheet 112 . The second light source 17 is used for emitting a detection beam 101 toward the top of the protective cover 13 . The detection beam 101 can pass through the reflective sheet 112 , the first light source 16 , the display panel 12 , and the protective cover 13 to reach the external object 1000 . The external object 1000 reflects or transmits the detection beam 101, and the detection module 19 can receive the detection beam 101 reflected or transmitted by the external object 1000 through the display device 10 and convert it into a corresponding electrical signal, for example: including the external object 1000 image data signals of biometric information. Wherein, the external object 1000 transmitting the detection beam 101 includes that the external object 1000 transmits the detection beam 101 that has entered its interior.

Further, the position where the external object 1000 receives the detection beam 101 into the inside is different from the position where the external object 1000 transmits the detection beam 101 . Of course, in other embodiments, the position where the external object 1000 receives the detection beam 101 into the interior and the position where the external object 1000 transmits the detection beam 101 may be the same. The embodiments of the present invention are not limited.

In this embodiment, the protective cover 13 has a lower surface (not labeled) opposite to the display panel 12 and an upper surface (not labeled) facing away from the display panel 12 . The upper surface of the protective cover 13 has a transmitting area TA (transmitting area) and an incident area RA (receiving area). The exit area TA is defined as the area where the detection beam 101 exits from the upper surface of the protective cover 13, and the incident area RA is the detection beam 101 reflected or transmitted by the external object 1000 from the upper surface of the protective cover 13. into the area of the protective cover 13 . The detection beam 101 incident from the incident area RA may be received by the detection module 19 .

Optionally, in other or modified embodiments, the outgoing area TA and the incident area RA have a partial overlapping area, and the area of the overlapping area is, for example but not limited to, about 30% or less of the area of the incident area RA. 20% etc.

Optionally, in other or modified embodiments, the incident area RA is the field of view area of the detection module 19 on the upper surface of the protective cover 13 . The incident area RA is at least partially located within the display area of the display device 10 .

The detection light beam 101 can be used for, but not limited to, biometric detection of external objects, and/or image generation, and/or spatial coordinate detection, distance sensing, and the like. The wavelength of the detection beam 101 is different from the wavelength of the backlight beam 100 .

Optionally, the detection module 19 has a first field of view area on the upper surface of the protective cover 13, and the detection light beam 101 can pass through the first field of view and be detected by the detection module 19. take over. At least a part of the first field of view area is located in the display area of the display device 10 .

The detection module 19 has a second field of view area on the top surface of the light guide plate 113 , and the detection module 19 can receive the detection beam transmitted from the second field of view.

Optionally, in other or modified embodiments, the backlight module 11 further includes a light blocking film (not shown in the figure), the light blocking film is used to transmit the backlight beam 100 and intercept the detection beam 101, the light blocking film At least a part of the film is located in the display area of the display device 10 , or, the light blocking film is located above the top surface of the light guide plate 113 except for the second viewing field area. The blocking of light beams includes but not limited to absorption and/or reflection of light beams.

The reflection sheet 112 can transmit the detection beam 101 and reflect the backlight beam 100 . Exemplarily, the reflective sheet 112 may have a multi-layer dielectric film structure with high reflectivity or high transmittance for light beams of specific wavelengths.

In other or modified embodiments, the reflective sheet 112 may also have other structures or materials. For example but not limited to, the reflection sheet 112 may have an opening facing the second light source 17 , and the detection beam 101 passes through the opening of the reflection sheet 112 and passes through the reflection sheet 112 . The present invention is not limited thereto.

The optical film layer 114 is used to diffuse and/or brighten the backlight beam 100 emitted from the top surface of the light guide plate 113 . The optical film layer 114 can transmit the detection beam 101 .

Please also refer to FIG. 3 , which is a partial cross-sectional schematic view of the display device 10 along line C-C in FIG. 1 , and the specific location may refer to line D-D in FIG. 2 . The first light source 16 includes a plurality of first light emitting units 161 and a first circuit board 162 . The plurality of first light emitting units 161 are closely attached to the first circuit board 162 and disposed under the first circuit board 162 . The first circuit board 162 is used to provide the first light emitting unit 161 with electrical signals required for light emission. The electrical signal includes but not limited to voltage signal, current signal and so on.

The plurality of first light emitting units 161 are spaced apart and located on one side of the light guide plate 113 . The plurality of first light emitting units 161 are used for emitting the backlight beam 100 to the side of the light guide plate 113 . In this embodiment, the distance between two adjacent first light emitting units 161 is not less than 1 mm. In other or modified embodiments, the distance between two adjacent first light-emitting units 161 may be different, for example but not limited to: the distance between two adjacent first light-emitting units 161 may be less than 1 mm or greater than 1 mm. The present invention is not limited thereto.

Optionally, in other or modified embodiments, the plurality of first light emitting units 161 are connected to each other without intervals.

Optionally, in other or modified embodiments, at least some of the adjacent first light emitting units 161 have intervals, and the intervals are equal or unequal.

The detection beam 101 can pass through the reflective sheet 112 , the space between the plurality of first light emitting units 161 , the display panel 12 , and the protective cover 13 to reach the external object 1000 .

Optionally, in other or modified embodiments, the detection light beam 101 can pass through the first light emitting unit 161 itself, and/or, the detection light beam 101 can pass through the plurality of first light emitting units 161 interval between.

Optionally, in some embodiments, the first circuit board 162 includes conductive lines and a flexible substrate. Further optionally, the conductive circuit and the flexible substrate can transmit the detection light beam 101 , for example but not limited to, the conductive circuit and the flexible substrate are made of transparent materials. Further optionally, the first circuit board 162 has an opening facing the upper surface of the second light source 17 (that is, the light-emitting surface of the second light source 17), and the detection beam 101 passes through the opening. The first circuit board 162 . Further optionally, in some embodiments, by rationally arranging the conductive circuit, the conductive circuit avoids the position relative to the second light source 17 , and the flexible substrate can transmit the detection beam 101 .

The second light source 17 includes a plurality of second light emitting units 171 . The second light-emitting unit 171 is at least opposite to the interval area between the plurality of first light-emitting units 161 . In other or modified embodiments, the second light source 17 may have different settings relative to the first light emitting unit 161 , for example but not limited to: the second light source 17 may be set directly opposite to the first light emitting unit 161 . The present invention is not limited thereto.

Optionally, the detection beam 101 emitted by the second light emitting unit 171 may pass through the first light emitting unit 161 itself and/or the space between the first light emitting units 161 .

In this embodiment, the plurality of first light-emitting units 161 are arranged in a row along a direction parallel to the side surface of the light guide plate 113 (it can be considered that the light-emitting surface of the first light-emitting units 161 is a distance from the light-emitting surface of the light guide plate 113 equal distance from side to side). In other or modified embodiments, the plurality of first light-emitting units 161 may have other arrangements or structures, for example but not limited to: the plurality of first light-emitting units 161 may be arranged in two or more rows, or a plurality of the first light-emitting units 161 may be The distances between the first light emitting unit 161 and the light guide plate 113 are not equal. The present invention is not limited thereto.

Optionally, the second light-emitting unit 171 is at least disposed opposite to a middle position where the plurality of first light-emitting units 161 are arranged in a row.

Optionally, the second light emitting unit 171 is connected to the first circuit board 162 through a conductive medium, and the first circuit board 162 is used to provide the second light emitting unit 171 with electrical signals required for light emission. The electrical signals include but not limited to voltage signals and current signals.

Optionally, the second light source 17 further includes a second circuit board (not shown). The second light emitting unit 171 is closely attached to the second circuit board and disposed above the second circuit board. The second circuit board is used to provide the second light emitting unit 171 with electrical signals required for light emission. The electrical signals include but not limited to voltage signals and current signals.

Optionally, the second light emitting unit 171 is connected to an external circuit through conductive glue and/or wires.

Optionally, in some embodiments, the first light-emitting unit 161 includes a first light-emitting surface (not labeled) facing the side of the light guide plate 113, and the backlight beam 100 and the normal line of the first light-emitting surface The included angle is not greater than 60 degrees. The second light emitting unit 171 includes a second light emitting surface (not labeled) parallel to the top surface of the light guide plate 113 , and the included angle between the detection beam 101 and the normal of the second light emitting surface is not more than 60 degrees. Of course, in other or modified embodiments, as required, the included angle between the backlight beam 100 and the normal of the first light-emitting surface may be greater than 60 degrees, and the included angle between the detection beam 101 and the normal of the second light-emitting surface may be Greater than 60 degrees. This embodiment of the present invention does not limit it. Optionally, at least part of the second light-emitting surfaces of the second light-emitting units 171 are facing the multiple first light-emitting units 161 and/or the intervals between adjacent first light-emitting units 161 .

The backlight module 11 also includes a light-shielding glue 116 disposed on the first light source 16. Specifically, the light-shielding glue 116 is disposed on the first circuit board 162, and the light-shielding glue 116 can block visible light, Moreover: the light-shielding glue 116 can transmit the detection light beam 101, or, the light-shielding glue 116 has an opening, and the detection light beam 101 passes through the light-shielding glue 116 through the opening, and the light-shielding glue 116 can The detection beam 101 is transmitted or blocked. Exemplarily, the light-shielding glue 116 is, for example but not limited to, made of infrared ink material, which is used to transmit near-infrared light and block visible light.

It should be noted that the number and position of elements of the first light emitting unit 161 and the second light emitting unit 171 in FIG. Not limited.

The display panel 12 includes a first substrate 121 , a liquid crystal layer 122 and a second substrate 123 which are stacked sequentially from bottom to top. The protruding portion of the first substrate 121 relative to the edge of the second substrate 123 is a terminal area 1211 . The terminal area 1211 is located in a non-display area of the display device 10 , and the first light source 16 is opposite to the terminal area 1211 and located below the terminal area 1211 . The second light source 17 is directly opposite to the first light source 16 and located under the reflection sheet 112 . The terminal area 1211 can transmit the detection beam 101 .

The display panel 12 further includes a panel circuit board 124 . One end of the panel circuit board 124 is connected to an edge portion of the terminal area 1211 and is bent outward to extend below the backlight module 11 . Optionally, in some embodiments, the panel circuit board 124 includes a flexible circuit board and/or a printed circuit board.

Optionally, the first substrate 121 and the second substrate 123 may be glass substrates, plastic substrates, semiconductor substrates, metal substrates and the like. The display panel 12 is, for example but not limited to, a liquid crystal display panel. The display device 10 is for example but not limited to a liquid crystal display device. The first substrate 121 is also called an array substrate, which includes a thin film transistor array composed of a plurality of thin film transistors (TFTs), a plurality of rows of scan lines (gate lines) and a plurality of columns of data lines (data lines). The scan lines and data lines may be connected to the driver through the terminal area 1211 or further connected to the driver circuit through the panel circuit board 124 . The second substrate 123 is also called a filter substrate or a color filter substrate, which includes a plurality of red, green and blue color filters arranged in an array.

Optionally, in some embodiments, the panel circuit board 124 includes a flexible substrate and conductive lines, and the detection beam can pass through the flexible substrate between the conductive lines of the panel circuit board 124, thereby transmitting through the The panel circuit board 124 is described above.

Optionally, in some embodiments, the panel circuit board 124 can be made of a material capable of transmitting the detection beam 101, such as but not limited to including a transparent film and a transparent conductive medium, and the transparent film is, for example, a PET film , the transparent conductive medium is an ITO electrode.

Optionally, in some embodiments, the connection portion between the panel circuit board 124 and the terminal area 1211 may have a first opening, and the first opening may be used for the detection beam 101 to pass through. The number of the first openings may be one or more.

Optionally, in some embodiments, the extension portion of the second light emitting unit 171 below the backlight module 11 has a second opening corresponding to the second light source 17 . At least a part of the second light source 17 is located in the second opening of the panel circuit board 124 . The number of the second openings may be one or more, and the number of the second openings may correspond to the number of the second light emitting units 171 .

Optionally, in some embodiments, the panel circuit board 124 may extend from below the second light source 17 and cover the lower surface of the second light source 17. Above the extension part of the panel circuit board 124 , the extension part of the panel circuit board 124 is located below the backlight module 11 .

Optionally, in some embodiments, the panel circuit board 124 can transmit the detection beam 101, the second light source 17 is disposed under the extension portion of the panel circuit board 124, and the second light source 17 faces the first light source 16 in the vertical direction (up-down direction in FIG. 2 ). The extended portion of the panel circuit board 124 is located below the backlight module 11 .

The display panel 12 further includes an integrated circuit 125 disposed on the terminal area 1211 . The integrated circuit 125 does not vertically overlap with the panel circuit board 124 . The integrated circuit 125 is disposed between the panel circuit board 124 and the second substrate 123 . The detection beam 101 can pass through the part of the terminal area 1211 not covered by the integrated circuit 125, including but not limited to: the detection beam 101 passes through the terminal area 1211 and the part connected to the terminal area 1211 The panel circuit board 124 passes through and can further pass through the protective cover 13; or the detection beam 101 passes through the part of the terminal area 1211 that is not covered by the integrated circuit 125 and the panel circuit board 124, and can Further through the protective cover 13 .

The integrated circuit 125 is disposed on the terminal area 1211 through a COG (chip on glass) process. Optionally, the panel circuit board 124 is connected to the terminal area 1211 through conductive glue, and the integrated circuit 125 is connected to the terminal area 1211 through conductive glue. The conductive adhesive is, for example but not limited to, anisotropic conductive adhesive ACF.

Optionally, in some embodiments, the integrated circuit 125 may be disposed on the extended portion of the panel circuit board 124 through a COF (chip on film) process. At this time, since the terminal area 1211 does not need to be provided with the integrated circuit 125, the terminal area 125 can have a smaller width, so that the display device 10 can have a narrower non-display area, such as viewed from the front. In the past, the display device 10 has a narrow bezel.

In this embodiment, the detection light beam 101 can pass through the reflective sheet 112 , the first light source 16 , the terminal area 1211 , and the protective cover 13 in order to emit to an external object. Specifically, the detection light beam 101 can sequentially pass through the reflective sheet 112, the space between the first light-emitting unit 161, the first circuit board 162, the light-shielding glue 116, the terminal area 1211 and the protective cover 13 to emit to external objects. 1000 on.

Optionally, in other or modified embodiments, the side of the terminal area 1121 facing away from the protective cover 13 is provided with an anti-reflection film (not shown in the figure), and the anti-reflection film is used to transmit the detection beam 101 And prevent the detection light beam 101 from being reflected, and the protection cover 13 can transmit the detection light beam 101 .

Optionally, in other or modified embodiments, the detection light beam 101 can sequentially pass through the reflective sheet 112, the first light source 16, the light-shielding glue 116, the terminal area 1211, the panel circuit board 124 and the protective cover 13 to exit to External object 1000 on.

Optionally, in other or modified embodiments, the light-shielding glue 116 may be omitted. At this time, the detection light beam 101 sequentially passes through the reflective sheet 112 , the first light source 16 , the terminal area 1211 , the panel circuit board 124 and the protective cover 13 and emits onto the external object 1000 .

The backlight beam 100 in this application includes visible light, such as but not limited to a beam with a wavelength range of 400-700 nm (nanometer). The detection light beam 101 includes invisible light, and the invisible light includes near-infrared light, such as but not limited to a light beam with a wavelength range of 800-1000 nm. Of course, in other or modified embodiments, the backlight beam 100 and/or the detection beam 101 may also have different wavelength ranges, for example but not limited to, the detection beam 101 may include visible light.

The backlight module 11 further includes a casing 111 located below the reflective sheet 112 , and the casing 111 accommodates the reflective sheet 112 , the light guide plate 113 , the first light source 16 and the optical film layer 114 . The casing 111 may include an iron shell (not numbered) on the bottom and a plastic frame (not numbered) on the side.

The casing 111 has a first opening facing the second light source 17 , and the second light source 17 is at least partially disposed in the first opening. The housing 111 has a second opening facing the detection module 19 , and the detection module 19 receives the detection beam reflected or transmitted by an external object through the second opening.

Optionally, the housing 111 may include metal material and/or plastic.

Optionally, the housing 111 may be made of a material capable of transmitting the detection beam 101 . At this time, the housing 111 can transmit the detection beam 101 without opening.

Optionally, the detection module 19 may be fixedly or detachably connected to the housing 111 by one or more methods of buckle, bolt, bonding, and welding.

Optionally, the detection module 19 may be fixedly or detachably connected to the middle frame 14 by one or more methods of buckle, bolt, bonding, and welding.

Optionally, the second light source 17 can be connected to the housing 111, and/or the middle frame 14, and/or the panel by one or more ways of buckling, bolting, bonding, and welding. The circuit board 124 and/or the reflection sheet 112 are fixedly connected or detachably connected.

Optionally, the middle frame 14 is made of a material capable of transmitting the detection beam 101, the detection module 19 can receive the detection beam 101 through the middle frame 14, and the middle frame 14 does not need A hole is opened facing the detection module 19 , and the detection module 19 is disposed under the middle frame 14 and at least partially within the display area of the display device 10 .

Optionally, the middle frame 14 has a groove or a depression corresponding to the detection module 19 , and the detection module 19 is arranged above the middle frame 14 corresponding to the groove or depression.

Optionally, the iron shell and/or plastic frame of the housing 111 may be omitted. At this time, the middle frame 14 is directly disposed under the reflection sheet 112 .

Optionally, the middle frame 14 can be omitted. At this time, the detection module 19 may be fixedly or detachably connected to the housing 111 by one or more methods of buckle, bolt, bonding and welding.

Optionally, please refer to FIG. 4. In a modified embodiment of the under-screen detection system 1, for the convenience of description, the component numbers of the embodiment shown in FIG. 4 are consistent with the embodiment shown in FIG. 2, as shown in FIG. The structure of the embodiment is basically the same as that of the embodiment shown in FIG. 2 . The difference is that the middle frame 14 has a groove facing the second light source 17 , and the second light source 17 is at least partially located in the groove of the middle frame 14 .

Optionally, please refer to FIG. 5. In a modified embodiment of the under-display detection system 1, for the convenience of description, the component numbers of the embodiment shown in FIG. 5 are consistent with those of the embodiment shown in FIG. The structure of the embodiment is basically the same as that of the embodiment shown in FIG. 2 . The difference is that the middle frame 14 has an opening facing the second light source 17 , and the second light source 17 is at least partially located in the opening of the middle frame 14 .

The detection module 19 receives the detection beam 101 and converts it into a corresponding electrical signal. The electrical signal is, for example but not limited to, an image data signal, and the image data signal includes biometric information of the external object 1000 . The electrical signal may be used for biometric detection of the external object 1000, or image generation. In addition, the detection light beam 101 reflected or transmitted by the external object 1000 can also be used to detect the spatial coordinate information of the external object 1000 , so that information such as the position and speed of the external object 1000 can be obtained.

In some embodiments, the detection module 19 or the display device 10 may further include a processor and a memory (not shown in the figure), and the processor can obtain the external object 1000 according to the detection beam 101 received by the detection module 19 2D information and/or depth information of .

Further, the memory also pre-stores biological feature information data, and the processor can compare the obtained two-dimensional information and/or depth information of the external object 1000 with the pre-stored biological feature information data, so as to realize external Two-dimensional and/or three-dimensional biometric detection and recognition of objects, such as but not limited to: two-dimensional and/or three-dimensional fingerprint detection, face detection, iris detection, subcutaneous capillary detection, etc.

In the embodiments or modified embodiments of the present invention, the detection beam 101 may include floodlight (FloodLight, floodlight refers to a beam with a wide irradiation area and divergent irradiation angle), speckle structured light, coded structured light, modulation One or more of the pulse signals.

The detection module 19 receives the detection light beam 101 emitted or reflected by the external object 1000 and obtains the biological feature information or image information of the external object 1000, and then can detect the biological feature information of the external object 1000 and/or image the external object 1000 The spatial coordinates of the external object 1000 are drawn, and/or detected. For example but not limited to: fingerprint detection, body temperature detection, heart rate detection, living body detection, etc.

In the above embodiments or other embodiments, the areas/positions where the external object 1000 receives and transmits the detection light beam 101 may be different or the same.

In the above embodiments or modified embodiments, the external object 1000 may be a finger, and the off-screen detection system 1 is capable of under-screen fingerprint detection and identification. However, the present invention is not limited to the external object 1000. In other modified embodiments, the external object 1000 can also be a face, palm, iris, blood vessel, etc. The under-screen detection system 1 can also be used to detect the external object 1000 facial features, iris features, palm prints, heart rate, body temperature, etc.

By detecting and identifying the biological characteristics of the external object 1000, the under-screen detection system 1 can be used for locking or unlocking of the device, online payment service verification, identity verification of the financial system or public security system, access verification of the access control system, etc. products and application scenarios.

By performing two-dimensional or three-dimensional image rendering on the external object 1000, the under-screen detection system 1 can also be applied to application scenarios such as photographing, video recording, and modeling.

By detecting the spatial coordinates of the external object 1000, the under-screen detection system 1 can also be applied to application scenarios involving direction, distance, speed and the like.

The under-screen detection system 1 can be used for two-dimensional and/or three-dimensional biometric detection and identification of the external object 1000, or for two-dimensional and/or three-dimensional image rendering of the external object 1000, or for external object 1000 2D and/or 3D spatial coordinate detection.

The under-screen detection system 1 can be a mobile phone, a tablet computer, a smart watch, an augmented reality/virtual reality device, a human motion detection device, an automatic driving car, a smart home device, a security device, an intelligent robot or components thereof.

Compared with the prior art, the under-screen detection system 1 of the present invention includes a second light source 17 , and the second light source 17 is located opposite to the first light source 16 and below the first light source 16 . The first light source 16 provides a backlight beam 100 for the display device 10 to normally display images, and the second light source 17 provides the detection module 19 with a detection beam 101 for off-screen detection. The detection light beam 101 can be invisible light, and the detection light beam 101 can pass through the display device 10. At this time, the emission and reception of the detection light beam 101 will not affect the normal image display of the display device 10, so the screen The off-screen detection system 1 can better realize the off-screen detection of the external object 1000 , including but not limited to off-screen biometric feature detection, image generation, spatial position detection, and the like. In addition, the second light source 17 may be disposed under the reflection sheet 112 or under the casing 111 . The second light source 17 can also be connected to the middle frame 14 . There is enough space under the reflector 112 and the backlight module 11 to accommodate the second light source 17, and the second light source 17 utilizes the existing space of the display device 10 to realize the setting of the light source for the detection beam 101, It does not need to occupy additional space of the display device 10, and has better practicability and applicability.

Please refer to FIG. 6 , in an embodiment of the present invention, the under-display detection system 2 includes a display device 20 and a detection module 29 disposed below the display device 20 . The detection module 29 can receive the detection light beam 201 reflected or transmitted by an external object through at least a part of the display area of the display device 20 . In this embodiment, the detection light beam 201 is, for example but not limited to, near-infrared light. In other or modified embodiments, the detection light beam 201 includes visible light and/or invisible light.

The display device 20 includes a backlight module 21 , a display panel 22 above the backlight module 21 , and a protective cover 23 above the display panel 22 . The display device 20 has a display area capable of displaying images and a non-display area located around the display area. The display panel 22 is used to display images, and the backlight module 21 is used to provide the display panel 21 with backlight beams required for image display. The protective cover 23 is used to protect the display panel 22 .

The backlight module 21 includes a reflective sheet 212, a light guide plate 213 located above the reflective sheet 212, an optical film layer 214 located above the light guide plate 213, a first light source 26 located on one side of the light guide plate 213, and a first light source 26 located on one side of the reflective sheet. 212 and facing the second light source 27 of the first light source 26 . The first light source 26 is used to emit a backlight beam 200 , and the backlight beam 200 is provided to the display panel 22 to realize image display. The second light source 27 is used for emitting a detection light beam 201, and the detection light beam 201 is used for biometric detection of the external object 1000, and/or image generation, and/or spatial position detection. The detection beam 201 can pass through the backlight module 21 , the display panel 22 , and the protective cover 23 to reach the external object 1000 .

The light guide plate 213 includes a bottom surface and a top surface opposite to each other, and a side surface located between the bottom surface and the top surface and facing the first light source 26 . The first light source 26 is used to emit a backlight beam 200 of visible light to the side. The backlight beam 200 enters the light guide plate 213 from the side and exits from the top surface of the light guide plate 213 . The light guide plate 213 is used to guide the backlight beam 200 entering from the side to the upper optical film layer 214 .

The reflection sheet 212 is used to reflect the backlight beam 200 emitted from the bottom surface of the light guide plate 213 back to the light guide plate 213 .

The optical film layer 214 is used for diffusing and/or brightening the backlight beam 200 from the light guide plate 213 to further provide to the display panel 22 .

The first light source 26 includes a first light emitting unit 261 and a first circuit board 262 , and the first light emitting unit 261 is disposed under the first circuit board 262 close to the first circuit board 262 .

The backlight module 21 further includes a light-shielding glue 216 disposed above the first circuit board 262 . The light-shielding glue 216 covers the first circuit board 262 . Optionally, in some embodiments, the light-shielding glue 216 may cover part of the light guide plate 213 and/or the optical film layer 214 . The light-shielding glue 216 can prevent the backlight beam 200 and other visible light from penetrating. In this embodiment, the light-shielding glue 216 can transmit the detection light beam 201 . Optionally, in some embodiments, the light-shielding glue 216 is made of a material capable of transmitting the detection beam 201 and blocking the backlight beam 2000, for example but not limited to, the detection beam 201 is infrared light or near Infrared light, the backlight beam 200 is visible light, and the light-shielding glue 216 is infrared ink. Optionally, in some embodiments, the light-shielding glue 216 has an opening through which the detection light beam 201 passes. Therefore, the light-shielding glue 216 can block the backlight light beam and transmit the detection light beam, or: the light-shielding glue 216 has an opening for the detection light beam 201 to pass through, and the light-shielding glue 216 can transmit or block the light-shielding light beam. Detection beam 201 .

The second light source 27 is used for emitting a detection beam 201 to the upper side of the protective cover 23 . The detection beam 201 can pass through the reflective sheet 212 , the first light source 26 , the display panel 22 and the protective cover 23 to reach the external object 1000 . The external object 1000 may contact the protective cover 23 or be at a certain distance from the protective cover 23 .

In this embodiment, the display device 20 further includes an optical coating 231 disposed on the lower surface of the protective cover 23 , and the optical coating 231 corresponds to a non-display area of the display device 20 . The optical coating 231 can transmit the detection beam 201 and intercept the backlight beam 200 or other visible beams. The detection beam 201 can pass through the reflective sheet 212 , the first light source 26 , the display panel 22 , the optical coating 231 and the protective cover 23 to reach the external object 1000 . Optionally, the optical coating 231 is infrared ink, the detection beam 201 is near-infrared light, the backlight beam 200 is visible light, and the infrared ink is used to transmit near-infrared light and absorb visible light.

Optionally, in other or modified embodiments, the optical coating 231 may be omitted.

Optionally, in other or modified embodiments, the optical coating 231 may be integrated in the protective cover 13 .

The display panel 22 includes a lower polarizer 224 , a first substrate 221 , a liquid crystal layer 222 , a second substrate 223 , and an upper polarizer 225 stacked in order from bottom to top. The first substrate 221 is also called an array substrate, and the second substrate 223 is also called a color filter substrate. The first substrate 221 has a protruding terminal area 2211 extending outward along a side edge of the second substrate 223 . The terminal area 2211 is located in a non-display area of the display device 20 . The second substrate 223 , the liquid crystal layer 222 , the upper polarizer 225 , and the lower polarizer 224 are basically arranged corresponding to the display area of the display device 40 .

The lower polarizer 224 and the upper polarizer 225 have different polarization directions. After the backlight beam 200 enters the lower polarizer 224 , the backlight beam 200 with a specific polarization direction is allowed to exit. When the backlight beam 200 of the specific polarization direction passes through the liquid crystal layer 222 , it is deflected along with the deflection of the liquid crystal molecules of the liquid crystal layer 222 , so that it can exit from the upper polarizer 225 .

The display panel 22 further includes a panel circuit board 224 , a portion of the panel circuit board 224 is connected to an edge portion of the terminal area 2211 and is bent outward to extend below the backlight module 21 . The panel circuit board 224 includes a flexible circuit board. Optionally, in some embodiments, the panel circuit board 224 includes a flexible circuit board and/or a printed circuit board.

Optionally, in some embodiments, the extension portion of the panel circuit board 224 has holes corresponding to the second light source 27 . The extended portion of the panel circuit board 224 is located below the backlight module 21 . At least a part of the second light source 27 is located in the opening of the extension portion of the panel circuit board 224 , facing the first light source 26 and disposed under the reflection sheet 212 .

Optionally, in some embodiments, the panel circuit board 224 may extend from below the second light source 27 and cover the lower surface of the second light source 27 . At this time, the second light source 27 can be regarded as being located above the extension portion of the panel circuit board 224 . The extended portion of the panel circuit board 224 is located below the backlight module 21 .

Optionally, in some embodiments, the panel circuit board 224 can transmit the detection beam 201 . The second light source 27 is disposed below the extension portion of the backlight module 21 of the panel circuit board 224, and the second light source 27 is in the vertical direction (up-down direction in FIG. 6 ). Facing the first light source 26 .

Optionally, in some embodiments, the part where the panel circuit board 224 is connected to the terminal area 2212 has an opening for the detection beam 201 to pass through, or the panel circuit board 224 and the terminal area The part connected by 2212 is capable of transmitting the detection beam 201 .

The display panel 22 further includes an integrated circuit 225 disposed on the terminal area 2211 and does not overlap with the panel circuit board 224 . In this embodiment, the integrated circuit 225 is disposed on the terminal area 2211 through a COG (chip onglass) process. Optionally, the integrated circuit 225 can also be arranged on the bent extension part of the panel circuit board 224, at this time, the integrated circuit 225 can be arranged on the panel circuit board by a COF (chip on film) process on the bent extension. The integrated circuit 225 may be a display driving circuit and/or a touch detection circuit.

The detection beam 201 can sequentially pass through the reflective sheet 212, the first light source 26, the light-shielding glue 216, the terminal area 2211, the panel circuit board 224, and the protective cover 23 to reach external objects. 1000; or the detection light beam 201 can sequentially pass through the reflective sheet 212, the first light source 26, the light-shielding glue 216, the terminal area 2211, and the protective cover 23 to reach the external object 1000.

The detection light beam 201 needs to pass through multiple different film layers of the backlight module 21 and the display panel 22 in the process of being emitted from the second light source 27 until reaching the external object 1000 . For example but not limited to, when the detection beam 201 passes through the terminal area 2211 , part of the detection beam 201 may be reflected in the terminal area 2211 . When the detection beam 201 passes through the panel circuit board 224 , part of the detection beam 201 may be reflected on the panel circuit board 224 . When the detection beam 201 passes through the protection cover 23 , part of the detection beam 201 may be reflected on the protection cover 23 . The detection light beam 201 may also enter the display area of the display device 20 and may be reflected by the lower polarizer 224 and/or the upper polarizer 225 .

The reflected light beam of the detection light beam 201 formed under the above various reflection situations may be referred to as a reflected interference light beam of the detection light beam 201 . All may be received by the detection module 29 through the display panel 22 and/or the backlight module 21 .

Therefore, in order to prevent the reflected interference beam of the detection beam 201 from being received by the detection module 29 after being reflected by the terminal area 2211 when passing through the terminal area 2211, the backlight module 21 can A light blocking film 218 is further included. The light blocking film 218 is located below the display panel 22 . Specifically, the light blocking film 218 is partly located above the light-shielding glue 216 , and partly located above the optical film layer 214 . The light blocking film 218 is used for absorbing the detection beam 201 of reflected interference light.

It should be noted that, in this embodiment, the detection light beam 201 can pass through different positions of the terminal area 2211, including but not limited to: the detection light beam 201 can be transmitted from between the integrated circuit 225 and the second substrate 223 The terminal area 2211 passes through, or the detection beam 201 can pass through the connection between the panel circuit board 224 and the terminal area 2211 .

In other or modified embodiments, the detection beam 201 can also be configured to pass through a specific position or area of the terminal area 2211 . For example but not limited to, the part of the light-shielding glue 216 close to the display area can transmit the detection beam 201 , while the part away from the display area cannot transmit the detection beam 201 . At this time, the detection light beam 201 can only pass through the part of the light-shielding glue 216 adjacent to the display area of the display device 20 to project upwards and pass through the part of the terminal area 2211 adjacent to the display area to exit to the protection device. Cover plate 23, and further penetrate the protective cover plate 23. Alternatively, the lower surface of the terminal area 2211 is coated with an optical coating, so that the detection beam 201 passes through a specific position or area of the terminal area 2211 . This embodiment of the present invention does not limit it.

Optionally, please refer to FIG. 7 , which is a partial cross-sectional schematic diagram of a modified embodiment of the under-display detection system 2 . For the convenience of description, the component numbers of the embodiment shown in FIG. 7 are consistent with those in FIG. 6 . The embodiment shown in FIG. 7 is basically the same in structure and function as the under-display detection system 2 shown in FIG. In the field area, the light blocking film 218 is disposed above the light guide plate 213 corresponding to the area outside the second field of view area. Specifically, the light blocking film 218 is disposed above the optical film layer 214 and below the display panel 22 . The light blocking film 218 may be partially located in the display area of the display device 20 and partially located in the non-display area. Optionally, the light blocking film 218 may be entirely located in the display area of the display device 20 .

Optionally, please refer to FIG. 8 , which is a partial cross-sectional schematic diagram of a modified embodiment of the under-display detection system 2 . For the convenience of description, the component numbers of the embodiment shown in FIG. 8 are consistent with those in FIG. 6 . The embodiment shown in FIG. 8 is basically the same in structure and function as the under-display detection system 2 shown in FIG. 6 , except that the display panel 22 further includes an anti-reflection film 228 located below the terminal area 2211 . The anti-reflection film 228 is disposed corresponding to the non-display area of the display device 20 . The anti-reflection film 228 is used to reduce or prevent the reflection of the detection beam 201 when passing through the terminal area 2211 , so as to further reduce the reflected interference light of the detection beam 201 .

The anti-reflection film 228 and/or the light-blocking film 218 in the embodiments shown in FIGS. The location and arrangement of the film 218 can be different, for example, but not limited to, the anti-reflection film 228 can also be located at least partially in the display area, and the light blocking film 218 can also belong to the display panel 22 . This embodiment of the present invention does not limit it.

The structures and components such as the housing 111 and the middle frame 14 of the embodiments shown in FIGS. 2-5 can also be applied to the embodiments shown in FIGS. 6-8 , as well as other or modified embodiments of the present invention. This embodiment of the present invention does not limit it.

Compared with the prior art, the under-screen detection system 2 of the present invention includes a second light source 27 , and the second light source 27 is directly opposite to the first light source 26 and located below the first light source 26 . The first light source 26 provides a backlight beam 200 for the display device 20 to normally display images, and the second light source 27 provides the detection module 29 with a detection beam 201 for off-screen detection. The detection light beam 201 can be invisible light, and the detection light beam 201 can pass through the display device 20 . At this time, the emission and reception of the detection light beam 201 does not affect the normal image display of the display device 10 . Therefore, the off-screen detection system 1 can better realize off-screen detection of the external object 1000 , including but not limited to under-screen biometric feature detection, image generation, spatial position detection, and the like. The second light source 27 utilizes the existing space of the display device 20 to realize the installation of the light source for detecting the light beam 201 without occupying additional space of the display device 20 , which has better practicability and applicability. In addition, the light blocking film 218 and the anti-reflection film 228 of the under-screen detection system 2 can further enhance the detection module 29's effect of receiving and collecting the detection beam 201, so that the under-screen detection effect is better.

It should be noted that those skilled in the art can understand that part or all of the embodiments of the present invention, as well as part or all of the embodiments of the embodiment of the deformation, replacement, change, split, combination, Extensions and the like should be considered to be covered by the inventive idea of the present invention and belong to the protection scope of the present invention.

It should be noted that the light-emitting surface, side surface, top surface, upper surface, lower surface, etc. that may be involved in the description of this application may be a physical surface or a hypothetical surface, which does not necessarily need to actually exist. To belong to the invention scope of the present application.

The above embodiments and modified embodiments of the present application describe the under-display detection system in different situations, and structures thereof such as backlight module and display panel. Those skilled in the art can understand that, in order to achieve off-screen biometric detection while making the display device have a higher screen-to-body ratio, the second light source for emitting the detection light beam will be placed below the first light source, or the display device will use the internal current There is space, so that the display device can achieve a better off-screen biometric detection effect, and at the same time have a higher screen-to-body ratio and visual effects. Splitting, combining, deforming, zooming, limited number of tests, and other changes and settings of the embodiments of the present invention or modified embodiments all belong to the protection scope of the present invention.

It should be noted that, in the above embodiments or modified embodiments of the present invention and the corresponding modified settings, the light source (16, 26), the backlight module (11, 21), the display panel (12, 22), the terminal area (1211, 2211), light-shielding glue (116, 216), light-blocking film 218, anti-reflection film 228 and other structures, functions, principles and settings can also be applied in other embodiments disclosed by the present invention, thereby obtaining embodiments and replacements thereof , deformation, combination, splitting, expansion, etc. all belong to the protection scope of the present invention.

Alternatively, in the above embodiments, the second light source may also be disposed between the reflective sheet and the first light source. In addition, after the detection beam passes through the space between the first light emitting units, it can also bypass one side of the display panel through the light guide element and then pass through the cover plate, that is, there is an implementation mode, the detection The light beam does not need to pass through the display panel while passing through the cover plate.

Further, in the above-mentioned embodiment, the second light source mainly transmits the detection light beam through the space between the first light-emitting units. Transmitted detection beams, as such, are also possible and should fall within the scope of protection of the present application.

It should be noted that those skilled in the art can understand that part or all of the embodiments of the present invention, as well as part or all of the embodiments of the embodiment of the deformation, replacement, change, split, combination, Extensions and the like should be considered to be covered by the inventive idea of the present invention and belong to the protection scope of the present invention.

In the description of this specification, descriptions referring to the terms "one embodiment", "certain embodiments", "exemplary embodiments", "example", "specific examples", or "some examples" are meant to be combined with The specific features, structures, materials, or characteristics described in the above embodiments or examples are included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

"Length", "width", "upper", "lower", "left", "right", "front", "back", "back", "front", "vertical" that may appear in the description of the present invention ", "horizontal", "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and Simplified descriptions, 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 thus should not be construed as limiting the invention. Similar numbers and letters denote similar items in the drawings, so once an item is defined in one drawing, it does not require further definition and explanation in subsequent drawings. Meanwhile, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance. In the description of the present invention, "multiple" or "plurality" means at least two or two, unless otherwise specifically defined. In the description of the present invention, it should also be noted that, unless otherwise specified and limited, "setting", "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrally connected; may be mechanically connected, may also be electrically connected; may be directly connected, may also be indirectly connected through an intermediary, and may be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. The terms used in the 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 should be determined by the protection scope of the claims.

Claims (20)

1. detection system under a kind of screen, which is characterized in that including display device and detection mould group, the detection mould group can be penetrated The display device at least partly receives from external object transmission or/and the detection light beam reflected and converts the inspection received Survey light beam is corresponding electric signal, and the display device includes the backlight module, display panel and guarantor set gradually from the bottom to top Protecting cover plate, the backlight module include:

Light guide plate, the side including the top and bottom being oppositely arranged and between the bottom surface and the top surface；

First light source, the first luminescence unit of the side including multiple neighbouring light guide plates, the multiple first luminescence unit Be connected with each other or the first at least partly adjacent luminescence unit between there is interval, the multiple first luminescence unit is used for institute Side-emitted backlight beam is stated, the backlight beam enters inside light guide plate from the side, and from the top surface of the light guide plate It is emitted to the display panel, provides visible light beam for realizing that image is shown for the display panel；

Second light source is located at below the first light source, and the second light source is used for the top towards the cover sheet and emits Light beam is detected, the detection light beam can shine single through the multiple first luminescence unit itself and/or the multiple first Interval and the cover sheet between member reach external object, and biological characteristic of the detection light beam for external object is examined It surveys, the wavelength of the detection light beam is different from the wavelength of the backlight beam.

2. as described in claim 1 shield lower detection system, which is characterized in that shown described in the detection mould group at least partly face The display area of showing device is arranged below the backlight module；Alternatively, the detection mould group is at least partially disposed at the display Inside device.

3. as claimed in claim 2 shield lower detection system, which is characterized in that the detection mould group is at least partially disposed at described aobvious It include: that the detection mould group is at least partially disposed at the backlight module side, and/or the detection mould group at least inside showing device Part be located at the display panel side, and/or the detection mould group be at least partially disposed at the cover sheet side, and/or The detection mould group is at least partially disposed at below the cover sheet, and/or the detection mould group is at least partially disposed at the guarantor Between protecting cover plate and display panel, and/or the detection mould group is at least partially disposed between the display panel and backlight module.

4. as described in claim 1 shield lower detection system, which is characterized in that the second light source at least face the multiple the Interval region setting between one luminescence unit itself and/or the first adjacent luminescence unit.

5. as claimed in claim 4 shield lower detection system, which is characterized in that the multiple first luminescence unit is at least partly When the setting of interval, the interval between the first adjacent luminescence unit is at least 1 millimeter.

6. as described in claim 1 shield lower detection system, which is characterized in that the backlight module further comprises reflector plate, It is located at below the light guide plate and first light source, and the backlight beam being emitted from the bottom surface of the light guide plate can be by the reflection Piece reflects back into inside the light guide plate；First light source described in the second light source face is located at below the reflector plate, described Detecting light beam can be through the interval between the reflector plate, the multiple first luminescence unit, the display panel and described Cover sheet reaches external object, and biological characteristic of the detection light beam for external object detects, wherein the detection light beam Wavelength be different from the backlight beam wavelength.

7. as claimed in claim 6 shield lower detection system, which is characterized in that the second light source, which has, faces the reflector plate Light-emitting surface, the detection light beam is emitted from the light-emitting surface.

8. as claimed in claim 6 shield lower detection system, which is characterized in that the reflector plate has second light source described in face Aperture, the detection light beam pass through the aperture be emitted or the reflector plate be transmissive to the detection light beam.

9. as claimed in claim 6 shield lower detection system, which is characterized in that the backlight module further includes being located at the reflection Shell below piece, the shell accommodate the reflector plate, the light guide plate and the first light source, the second light source and are located at The lower section of the shell, the shell can penetrate the detection light beam；Or, the shell has opening, the second light source Opening described in face is arranged below the shell, or, the second light source is at least partially disposed in the opening, described second The detection light beam of light source transmitting through the shell and can reach the reflector plate from the opening.

10. as described in claim 1 shield lower detection system, which is characterized in that shown device has for displaying images Display area and the non-display area around the display area, the first light source are located at the non-aobvious of the display device Show region, the second light source is located at the non-display area of the display device.

11. as described in claim 1 shield lower detection system, which is characterized in that the backlight module further includes being arranged described Shading glue above first light source, the shading glue can obstruct visible light, and: the shading glue is transmissive to the detection Light beam, alternatively, the shading glue has aperture, the detection light beam penetrates the shading glue, the shading glue from the aperture It is transmissive to or obstructs the detection light beam.

12. as described in claim 1 shield lower detection system, which is characterized in that the first light source further include with it is the multiple The first circuit board that first luminescence unit is electrically connected, the first circuit board for the multiple first luminescence unit for providing Driving signal, the multiple first luminescence unit is close to the first circuit board and is arranged below the first circuit board, described Detection light beam can penetrate the first circuit board.

13. as claimed in claim 12 shield lower detection system, which is characterized in that the multiple first luminescence unit is neighbouring described The side of light guide plate, the first circuit board is adjacent to the side of the light guide plate, alternatively, the light guide plate further includes described in connection The transition face of side and top surface, the first circuit board are at least partially disposed on the transition face of the light guide plate, the transition Face includes horizontal plane, and/or slope, and/or cambered surface, and thickness of the light guide plate at top surface is less than or equal to the leaded light Thickness of the plate at transition face.

14. as claimed in claim 6 shield lower detection system, which is characterized in that the second light source includes multiple second luminous Unit, being arranged at intervals below the reflector plate between the first adjacent luminescence unit of the second luminescence unit face, institute The second luminescence unit is stated for emitting the detection light beam towards the cover sheet.

15. as claimed in claim 14 shield lower detection system, which is characterized in that first luminescence unit includes leading with described The angle of the normal of first light-emitting surface of tabula rasa face, the backlight beam and the first light-emitting surface is not more than 60 degree；Described second Luminescence unit includes second light-emitting surface parallel with the top surface of the light guide plate, the normal of the detection light beam and the second light-emitting surface Angle be not more than 60 degree.

16. as described in claim 1 shield lower detection system, which is characterized in that the display panel includes first substrate and institute The second substrate that first substrate is oppositely arranged and the liquid crystal layer between the first substrate and the second substrate are stated, The part that the edge of the relatively described the second substrate of the first substrate extends protrusion is terminal region, and the terminal region is located at described aobvious The non-display area of showing device, terminal region described in the first light source face are located at below the terminal region, the second light source Below the first light source, the terminal region is transmissive to the detection light beam.

17. as claimed in claim 16 shield lower detection system, which is characterized in that the display panel further includes panel circuit Plate, one end of the panel circuit plate connect the marginal portion of institute terminal region and bend downward and extend under the backlight module Side, it is described that there is the panel circuit plate aperture for supplying the detection light beam to pass through or the panel circuit plate to be transmissive to Light beam is detected, the detection light beam is emitted to external object through the first light source, the terminal region, the cover sheet On.

18. detection system under the screen as described in any one of claim 1~17, which is characterized in that the detection light beam packet Include near infrared light.

19. as claimed in claim 18 shield lower detection system, which is characterized in that the cover sheet has and the display surface The opposite lower surface of plate and back to the upper surface of the display panel, upper table of the detection mould group in the cover sheet Face has the first field of view, and at least part of first field of view is located at the display area of the display device；Institute State detection mould group has the second field of view on the top surface of the light guide plate, and the detection mould group is to from second visual field area Domain is received transmitted through the detection light beam come；The backlight module further comprises photoresist diaphragm, and the photoresist diaphragm is used for Through backlight beam and the detection light beam that the terminal region reflexes on the backlight module is intercepted, the photoresist diaphragm is at least A part is located at the display area of the display device, alternatively, the photoresist diaphragm is located at the top surface of light guide plate except described the The top of the exterior domain of two field of view.

20. as described in claim 1 shield lower detection system, which is characterized in that after the detection mould group is used for according to conversion Electric signal obtains the biological characteristic of external object, and/or generates the image of external object, and/or the space of detection external object Coordinate.