CN110376780B

CN110376780B - Under-screen detection system, liquid crystal display device and backlight module

Info

Publication number: CN110376780B
Application number: CN201910658132.6A
Authority: CN
Inventors: 朱文龙; 周扬
Original assignee: Shenzhen Fushi Technology Co Ltd
Current assignee: Shenzhen Fushi Technology Co Ltd
Priority date: 2019-07-20
Filing date: 2019-07-20
Publication date: 2024-04-02
Anticipated expiration: 2039-07-20
Also published as: CN110376780A

Abstract

The invention discloses an under-screen detection system which comprises a display device and a detection module, wherein the detection module can receive detection light beams from an external object through at least part of the display device and convert the detection light beams into electric signals, the display device comprises a backlight module, a display panel and a protective cover plate, and the backlight module comprises 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 for emitting detection light beams towards the upper side of the protection cover plate, and the detection light beams can penetrate through the first light emitting units and/or intervals among the first light emitting units and the protection cover plate to reach an external object. The detection beam is used for biological feature detection of an external object, and the wavelength of the detection beam is different from that of the backlight beam. The invention has better under-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 technical field of photoelectricity, in particular to an under-screen detection system, a display device thereof and a backlight module.

Background

With the technical progress and the improvement of living standard of people, users are required to have more functions and fashionable appearance for electronic products such as mobile phones, tablet computers, cameras and the like. At present, the development trend of the mobile phone is to have higher screen occupation ratio and functions of front camera self-timer, face recognition and the like. Along with the richer functions supported by the mobile phone, the number of elements to be set is increased, and the positions of a part of display areas need to be occupied, so that the attractiveness and the user experience are affected.

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

Disclosure of Invention

In view of the above, 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 detection for solving the problems of the prior art.

An aspect of the present invention provides an under-screen detection system, including a display device and a detection module, where the detection module is capable of receiving a detection light beam from an external object through at least a part of the display device and converting the detection light beam into an electrical signal, the display device includes a backlight module, a display panel, and a protective cover plate, which are sequentially disposed from bottom to top, and the backlight module includes: the light guide plate comprises a top surface, a bottom surface and a side surface, wherein the top surface and the bottom surface are oppositely arranged; a first light source including a plurality of first light emitting units adjacent to a side surface of the light guide plate, the plurality of first light emitting units being connected to each other or having a space between at least a portion of adjacent first light emitting units, the plurality of first light emitting units being configured to emit backlight beams toward the side surface, the backlight beams entering an inside of the light guide plate from the side surface and exiting from a top surface of the light guide plate to the display panel, for providing visible beams for image display of the display panel; and a second light source located below the first light source, the second light source being configured to emit a detection light beam toward an upper side of the protective cover plate, the detection light beam being capable of passing through the plurality of first light emitting units themselves and/or intervals between the plurality of first light emitting units, and the protective cover plate to reach an external object, the detection light beam being used for biometric detection of the external object, a wavelength of the detection light beam being different from a wavelength of the backlight light beam.

In some embodiments, the detection module is at least partially disposed below the backlight module corresponding to a display area of the display device; or, the detection module is at least partially located inside the display device, and the detection module is located inside the display device and includes: the detection module is at least partially positioned on one side of the backlight module, and/or the detection module is at least partially positioned on one side of the display panel, and/or the detection module is at least partially positioned on one side of the protective cover plate, and/or the detection module is at least partially positioned below the protective cover plate, and/or the detection module is at least partially positioned between the protective cover plate and the display panel, and/or the detection module is at least partially positioned between the display panel and the backlight module.

In some embodiments, the second light source is disposed at least directly opposite to the plurality of first light emitting units themselves, and/or, a spacing region between adjacent first light emitting units.

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

In some embodiments, the backlight module further includes a reflective sheet, which is located below 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 into the light guide plate by the reflective sheet; the second light source is right opposite to the first light source and is positioned below the reflecting sheet, the detection light beam can penetrate through the reflecting sheet, the intervals among the plurality of first light emitting units, the display panel and the protective cover plate to reach an external object, and the detection light beam is used for detecting the biological characteristics 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 light beam exits from the light emitting surface.

In some embodiments, the reflecting sheet has an opening facing the second light source, the detection light beam exits through the opening, or the reflecting sheet is capable of transmitting the detection light beam.

In some embodiments, the backlight module further includes a housing located below the reflective sheet, the housing accommodates the reflective sheet, the light guide plate, and the first light source, the second light source is located below the housing, and the housing is capable of transmitting the detection light beam; or, the shell is provided with an opening, the second light source is arranged under the shell right against the opening, or at least partially positioned in the opening, and the detection light beam emitted by the second light source can penetrate through the shell from the opening and reach the reflecting 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; alternatively, the second light source is fixed with the housing; or, the second light source is fixed with the reflector plate.

In some embodiments, the second light source is located above the middle frame; alternatively, the middle frame is provided with an opening or a groove corresponding to the second light source, and at least one part of the second light source is positioned in the opening or the groove.

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

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 below the second light emitting unit, the second circuit board is used for providing driving signals for the second light emitting unit, the backlight module further includes a middle frame located below the housing, and the second light emitting unit and the second circuit board are located above the middle frame; or, the middle frame is provided with an opening or a groove corresponding to the second light-emitting unit and the second circuit board, and at least one part of the second light-emitting unit or the second circuit board is positioned in the opening or the groove.

In some embodiments, the display device has a display area for displaying an image 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.

In some embodiments, the backlight module further includes a light shielding glue disposed above the first light source, where the light shielding glue can block visible light, and: the shading glue can transmit the detection light beam, or the shading glue is provided with an opening, the detection light beam penetrates through the shading glue from the opening, and the shading 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, the first circuit board is configured to provide driving signals for the plurality of first light emitting units, the plurality of first light emitting units are disposed under 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 a side surface of the light guide plate, the first circuit board is adjacent to a side surface of the light guide plate, or the light guide plate further comprises a transition surface connecting the side surface and the top surface, at least part of the first circuit board is located on the transition surface of the light guide plate, the transition surface comprises a horizontal surface, and/or a slope surface, and/or an arc surface, and the thickness of the light guide plate at the top surface is smaller 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, the second light emitting units are disposed under the reflective sheet opposite to the interval between adjacent first light emitting units, and the second light emitting units are configured to emit the detection light beam toward the protective cover plate.

In some embodiments, the second light emitting unit is disposed at least opposite to a middle position of the first light emitting units arranged in a row.

In some embodiments, the second light emitting unit is electrically connected to an external driving circuit through a conductive medium, the conductive medium including conductive paste or wires; or, the second light source further includes a second circuit board, where the second circuit board is located below the second light emitting unit, and the second circuit board is used to provide a driving signal for the second light emitting unit.

In some embodiments, the backlight module further includes a light shielding glue disposed on a side of the first circuit board opposite to the first light emitting unit, where the light shielding glue can block visible light, and: the shading glue can transmit the detection light beam, or the shading glue is provided with an opening, the detection light beam penetrates through the shading glue from the opening, and the shading glue can transmit or block the detection light beam.

In some embodiments, the first light emitting unit includes a first light emitting surface opposite to the light guide plate, and an included angle between the backlight beam and a normal line of the first light emitting surface is not greater than 60 degrees; the second light-emitting unit comprises 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 line 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 disposed between the first substrate and the second substrate, where a portion of the first substrate extending and protruding relative to an edge of the second substrate is a terminal area, the terminal area is located in a non-display area of the display device, the first light source is located under the terminal area and opposite to the terminal area, the second light source is located under the reflective sheet and opposite to the first light source, and the terminal area is capable of transmitting 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 an edge portion of the terminal area and is bent and extended to the lower portion of the backlight module, the panel circuit board has an opening through which the detection light beam passes, or the panel circuit board can transmit the detection light beam, and the detection light beam sequentially passes through the reflector plate, the first light source, the terminal area, and the protective cover plate to exit onto an 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 a portion of the terminal area not covered by the integrated circuit, and the detection light beam sequentially passes through the reflective sheet, the first light source, the terminal area, the panel circuit board, and the protective cover plate and exits to an external object.

In some embodiments, the detection beam comprises near infrared light.

In some embodiments, the display device further includes an optical coating on a lower surface of the protective cover plate, the optical coating corresponding to a non-display area of the display device, the optical coating being capable of transmitting the detection light beam and intercepting the backlight light beam or other visible light beam.

In some embodiments, the backlight module further includes an optical film layer above the light guide plate, where the optical film layer is used to diffuse and/or lighten the backlight beam exiting from the top surface of the light guide plate, and the optical film layer is capable of transmitting the detection beam.

In some embodiments, the protection cover plate has a lower surface opposite to the display panel and an upper surface opposite to the display panel, and the detection module has a first field area on the upper surface of the protection cover plate, where at least a portion of the first field area is located in the display area of the display device.

In some embodiments, the detection module has a second field area on the top surface of the light guide plate, and the detection module receives the detection light beam transmitted from the second field area; the backlight module further comprises a light blocking film, wherein the light blocking film is used for transmitting backlight light beams and intercepting detection light beams, and at least one part of the light blocking film is positioned in a display area of the display device, or the light blocking film is positioned above an area, except for the second view field area, of the top surface of the light guide plate.

In some embodiments, the detection module is configured to obtain a biological feature of the external object according to the converted electrical signal, and/or generate an image of the external object, and/or detect a spatial coordinate of the external object.

In certain embodiments, the biometric features include one or more of a fingerprint, iris, face, palm print, pulse, heart rate, blood flow rate, and living body.

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

In some embodiments, the display device further includes a protective cover plate, the display panel and the backlight module are located below the protective cover plate, the display panel includes a first substrate, a second substrate opposite to the first substrate, and a liquid crystal layer located between the first substrate and the second substrate, a portion of the first substrate, opposite to an edge of the second substrate, extending and protruding is a terminal area, and an anti-reflection film is disposed on a side of the terminal area opposite to the protective cover plate, and is used for transmitting a detection beam and preventing the detection beam from reflecting, and the protective cover plate is capable of transmitting the detection beam.

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

The under-screen detection system 1 has the beneficial effects that the under-screen detection system 1 comprises a second light source, wherein the second light source is positioned below the first light source right opposite to 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 a detection beam for the detection module to detect under the screen. The detection beam may be invisible light, and the detection beam may be transmitted through the display device. The detection light beam can transmit and receive through the display device, and normal image display of the display device is not affected. 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 with the middle frame. The reflector plate and the backlight module are provided with enough space below for accommodating the second light source, the second light source utilizes the existing space of the display device to realize the arrangement of the light source for detecting the light beam, and the display device is not required to be additionally occupied, so that the display device has good practicability and applicability.

Drawings

FIG. 1 is a schematic perspective view of one embodiment of an off-screen detection system of the present invention;

FIG. 2 is a schematic partial cross-sectional view of the off-screen detection system shown in FIG. 1;

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

FIG. 4 is a schematic partial cross-sectional view of a modified embodiment of an off-screen detection system of the present invention;

FIG. 5 is a schematic partial cross-sectional view of a modified embodiment of an off-screen detection system of the present invention;

FIG. 6 is a schematic partial cross-sectional view of a modified embodiment of an off-screen detection system of the present invention;

FIG. 7 is a schematic partial cross-sectional view of a modified embodiment of an off-screen detection system of the present invention;

FIG. 8 is a schematic partial cross-sectional view of a modified embodiment of an off-screen detection system of the present invention.

Detailed Description

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

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Further, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the present application. It will be appreciated, however, by one skilled in the art that the subject matter of the present application may be practiced without one or more of the specific details, or with other structures, components, etc. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring aspects of the application.

Referring to fig. 1, in one 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 an image and a non-display area NA surrounding the display area. Alternatively, the display area AA and the non-display area NA may have other shapes or positional relationships, such as, but not limited to, the back side, and/or the front side, and/or the side of the display device 10 having the display area AA and the non-display area NA; or the non-display area NA does not enclose the display area AA. The embodiments of the present invention are not limited.

Referring to fig. 2, a schematic partial cross-sectional view of the under-screen detection system 1 along line B-B in fig. 1 according to an embodiment of the present invention is shown. The display device 10 includes a backlight module 11, a display panel 12 and a protective cover 13 sequentially disposed from bottom to top. The display panel 12 is used for displaying an image, and the backlight module 11 is used for providing a backlight beam 100 required for displaying the image for the display panel 12. The protective cover 13 is used to protect the display panel 12. The protective cover 13 may be made of a transparent material such as, but not limited to: glass or sapphire.

In this embodiment, the display device 10 further includes an optical coating 131 disposed on the lower surface of the protective cover 13, where the optical coating 131 corresponds to a non-display area of the display device 10. The optical coating 131 is capable of transmitting the detection light beam 101 and intercepting the backlight light beam 100 or other visible light beam. Optionally, the optical coating 131 is an infrared ink, the detection light beam 101 is near infrared light, the backlight light beam 100 is visible light, and the infrared ink is used for transmitting near infrared light and absorbing visible light.

Alternatively, in other or alternative embodiments, the optical coating 131 may be omitted.

Alternatively, in other or alternative embodiments, the optical coating 131 may be integrated into the protective cover 13.

The display device 10 further comprises a middle frame 14 for accommodating at least a portion of the backlight module 11 and the display panel 12. The under-screen detection system 1 further comprises a detection module 19 arranged below the backlight module 11. The detection module 19 can receive the detection light beam 101 reflected by the external object 1000 through the display device 10 and/or the detection light beam 101 transmitted by the external object 1000. Wherein the transmission includes the transmission of the detection beam 101 from the external object 1000 into its interior. The reflected or transmitted detection beam 101 of the external object 1000 carries 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 may be used for example, but not limited to, biometric detection, and/or image generation, and/or spatial position detection of the external object 1000.

It should be noted that, the biometric detection described in the present application includes, but is not limited to, processes of sensing, information collecting, feature data comparing, and recognition result verifying of the external object 1000, and the biometric detection for the external object 1000 described in the present application refers to at least being able to be used to implement or be used to help implement the biometric detection.

It should be noted that, regarding the display device 10 as a whole, the display area AA and the non-display area NA included in the display device 10 illustrated in fig. 1 may include the upper or lower space of the area corresponding to the display area AA. For example, but not limited to, the non-display area NA of the display device 10 indicates a region of the front surface of the display device 10 that is not used for image display and a space inside of the region that corresponds to the region that should not be used for image display. The display panel 11, the protective cover 13, and the like 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. Also, the protective cover 13 may be regarded as a front surface of the display device 10 by being an outer surface member of the display device 10, and an upper surface of the protective cover 13. Therefore, for convenience of description, descriptions about a display area/non-display area and the like 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 an area opposite to the display area AA, and the non-display area of the display panel 11 is an area opposite to the non-display area NA, and so on, as will be clear to those skilled in the art.

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

The display panel 12 and the protective cover 13 have a good transmittance for the detection light beam 101. It should be noted that the better transmittance is relative to the optical imaging effect of the detection beam 101 received by the detection module 19 when the detection beam is used for detecting the biological feature of the external object 1000. The transmittance of the display panel 12 to the detection light beam 101 is, for example and without limitation, about 50%, and the transmittance of the protective cover 13 to the detection light beam 101 is, for example and without limitation, greater than 90%.

Optionally, an optical adhesive or an optical film (not shown in fig. 2) may be disposed 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 a side of the backlight module 11, and/or a side of the display panel 12, and/or a side of the protective cover 13, and/or the detection module 19 is at least partially located under the protective cover 13, and/or the detection module 19 is 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 with different wavelengths, wherein the backlight beam 100 is visible light, such as white light. The detection beam 101 is invisible light, and the invisible light includes near infrared light. The detection beam 101 is, for example, near infrared light. The visible light includes a light beam having a wavelength ranging from 400 to 700nm (nanometers), for example. The near infrared light includes a light beam having a wavelength range of 800 to 1000 nm. The detection beam 101 is, for example, a beam having a wavelength of 850nm or 940 nm. The first light source 16 and/or the second light source 17 may include, but are 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 reflective 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 reflecting sheet 112, the light guide plate 113, and the optical film layer 114 are stacked in order 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) between the bottom surface and the top surface.

The first light source 16 is configured to emit a backlight beam 100, and the backlight beam 100 is provided to the display panel 12 in a surface-emitting manner after passing through the light guide plate 113. The display panel 12 performs a visual image display under illumination by the backlight beam 100. The second light source 17 is located below the first light source 16, and the second light source 17 is configured to provide the detection light beam 101 to a detection space through the first light source 16 and/or through a light guiding structure (not shown). The wavelength of the detection beam 101 is different from the backlight beam 100. The detection light beam 101 can be reflected or transmitted by an external object 1000 located in the detection space and returned to the display device 10. The detection module 19 is capable of receiving the returned detection beam 101 and converting it into an electrical signal. Alternatively, the light guiding structure may be a light guiding plate, a light pipe, an optical fiber, a solid or a light guiding structure with a cavity, which is not limited in the embodiment of the present invention. The detection light beam 101 may reach the lower side of the protective cover 13 through the light guiding structure after being emitted from the second light source, and then reach the external object 1000 through the protective cover 13. At this time, the detection light beam 101 does not need to pass through the first light source 16 and the display panel 12, reducing transmission loss of the detection light beam 101 to 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 surface of the light guide plate 113 (or the thickness of the light guide plate 113 at the side surface) 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. The light guide plate 113 has a transition surface (not numbered) between the side surface and the top surface, which gradually reduces the thickness of the light guide plate 113. Since the thickness of the display area corresponding to the light guide plate 113 is small, the display device 10 can be made thinner as a whole. The transition surface may be a slope surface, an arc surface, or the like, or the transition surface may include 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, and in other embodiments, the light guide plate 113, the first light source 16, and the second light source 17 may have other structures and arrangements, for example, the top surface and the side surface of the light guide plate 113 are connected and have uniform thickness. The embodiment of the present invention is not limited thereto.

The first light source 16 is adjacent to the side surface and located at one side of the light guide plate 113. The first light source 16 is configured to emit a backlight light beam 100 toward the side surface, and the backlight light beam 100 enters the inside of the light guide plate 113 from the side surface 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 display an image.

The reflective sheet 112 is positioned under 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 then returned to the inside of the light guide plate 113.

The second light source 17 is disposed under the reflective sheet 112 directly opposite to the first light source 16. The second light source 17 has a light-emitting surface (not numbered) facing the reflection sheet 112. The second light source 17 is configured to emit a detection light beam 101 toward above the protective cover 13. The detection light 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 light beam 101, and the detection module 19 can receive the detection light beam 101 reflected or transmitted by the external object 1000 through the display device 10 and convert the detection light beam into a corresponding electrical signal, for example: an image data signal including biometric information of the external object 1000. Wherein the transmission of the detection beam 101 by the external object 1000 comprises the transmission of the detection beam 101 by the external object 1000 into its interior.

Further, the position where the external object 1000 receives the detection light beam 101 into the inside is different from the position where the external object 1000 transmits the detection light 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 numbered) opposite to the display panel 12 and an upper surface (not numbered) opposite to the display panel 12. The upper surface of the protective cover 13 has an exit area TA (transmitting area) and an entrance area RA (receiving area). The exit area TA is defined as an area where the detection light beam 101 exits from the upper surface of the protection cover 13, and the incident area RA is defined as an area where the detection light beam 101 reflected or transmitted by the external object 1000 enters the protection cover 13 from the upper surface of the protection cover 13. The detection beam 101 incident from the incident area RA may be received by the detection module 19.

Alternatively, in other or alternative embodiments, the exit area TA and the entrance area RA have a partial overlap area, for example, but not limited to, about no more than 30%, 20%, etc. of the area of the entrance area RA.

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

The detection beam 101 can be used for, but is not limited to, biometric detection of external objects, and/or image generation, and/or spatial coordinate detection, distance sensing, etc. 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 area on the upper surface of the protective cover 13, and the detection beam 101 can be received by the detection module 19 after passing through the first field area. At least a portion of the first field of view region is located in a display region of the display device 10.

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

Optionally, in other or alternative embodiments, the backlight module 11 further includes a light blocking film (not shown), where the light blocking film is used to transmit the backlight beam 100 and intercept the detection beam 101, and at least a portion of the light blocking 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 field area. Such blocking of the light beam includes, but is not limited to, absorption and/or reflection of the light beam.

The reflective sheet 112 is capable of transmitting the detection light beam 101 and reflecting the backlight light beam 100. For example, the reflective sheet 112 may have a multi-layered dielectric film structure having high reflectivity or high transmittance for a light beam of a specific wavelength.

Other or alternative embodiments, the reflective sheet 112 may have other structures or materials. For example, but not limited to, the reflective sheet 112 may have an opening facing the second light source 17, and the detection light beam 101 passes through the reflective sheet 112 through the opening of the reflective sheet 112. The invention is not limited in this regard.

The optical film layer 114 is used to diffuse and/or lighten the backlight beam 100 exiting from the top surface of the light guide plate 113. The optical film layer 114 is capable of transmitting the detection light beam 101.

Referring also to FIG. 3, a schematic cross-sectional view of the display device 10 of FIG. 1 along line C-C is shown, and reference is made to line D-D of FIG. 2 for a specific position. 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 disposed under the first circuit board 162 in close contact with the first circuit board 162. The first circuit board 162 is used for providing the first light emitting unit 161 with an electrical signal required for light emission. Including but not limited to voltage signals, current signals, and the like.

The plurality of first light emitting units 161 are disposed at intervals and located at one side of the light guide plate 113. The plurality of first light emitting units 161 are configured to emit the backlight light beam 100 toward the side of the light guide plate 113. In the present embodiment, the interval distance between two adjacent first light emitting units 161 is not less than 1 mm. In other or alternative embodiments, the spacing distance between two adjacent first light emitting units 161 may be different, for example, but not limited to: the interval distance between adjacent two first light emitting units 161 may be less than 1 millimeter or more than 1 millimeter. The invention is not limited in this regard.

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

Optionally, in other or alternative embodiments, at least part of the adjacent first light emitting units 161 have a space therebetween, and the distances of the spaces are equal or unequal.

The detection light beam 101 can pass through the reflective sheet 112, the intervals 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 alternative embodiments, the detection beam 101 may be transmitted through the first light emitting units 161 themselves, and/or the detection beam 101 may be transmitted through the spaces between the plurality of first light emitting units 161.

Optionally, in some embodiments, the first circuit board 162 includes conductive traces and a flexible substrate. Further alternatively, the conductive traces and flexible substrate can be transmissive to the detection beam 101, such as, but not limited to, the conductive traces and flexible substrate being made of a transparent material. Further alternatively, the first circuit board 162 has an opening facing the upper surface of the second light source 17 (i.e., the light-emitting surface of the second light source 17), and the detection light beam 101 passes through the first circuit board 162 through the opening. Further alternatively, in some embodiments, the flexible substrate is capable of transmitting the detection beam 101 by properly routing conductive traces such that the conductive traces avoid the relative position with the second light source 17.

The second light source 17 includes a plurality of second light emitting units 171. The second light emitting unit 171 is disposed at least opposite to the interval region between the plurality of first light emitting units 161. In other or alternative embodiments, the second light source 17 may have a different arrangement with respect to the first light emitting unit 161, such as, but not limited to: the second light source 17 may be disposed opposite to the first light emitting unit 161. The invention is not limited in this regard.

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

In this embodiment, the plurality of first light emitting units 161 are arranged in a row in a direction parallel to the side surface of the light guide plate 113 (the light emitting surfaces of the first light emitting units 161 may be considered to be equally spaced from the side surface of the light guide plate 113). In other or alternative embodiments, the plurality of first light emitting units 161 may have other arrangements or structures, such as, but not limited to: the plurality of first light emitting units 161 may be arranged in two or more rows, or the plurality of first light emitting units 161 and the light guide plate 113 may be not equidistant. The invention is not limited in this regard.

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

Alternatively, 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 an electrical signal required for light emission. The electrical signals include, but are not limited to, voltage signals, current signals.

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

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

Optionally, in some embodiments, the first light emitting unit 161 includes a first light emitting surface (not numbered) facing the side of the light guide plate 113, and an included angle between the backlight beam 100 and a normal line of the first light emitting surface is not greater than 60 degrees. The second light emitting unit 171 includes a second light emitting surface (not numbered) parallel to the top surface of the light guide plate 113, and an angle between the detection beam 101 and a normal line of the second light emitting surface is not more than 60 degrees. Of course, in other or alternative embodiments, the included angle between the normal of the backlight beam 100 and the first light emitting surface may be greater than 60 degrees, and the included angle between the normal of the detection beam 101 and the second light emitting surface may be greater than 60 degrees, as desired. The embodiment of the present invention is not limited thereto. Alternatively, at least a part of the second light emitting surface of the second light emitting unit 171 is disposed opposite to the plurality of first light emitting units 161 and/or the interval between the adjacent first light emitting units 161.

The backlight module 11 further includes a light shielding adhesive 116 disposed on the first light source 16, specifically, the light shielding adhesive 116 is disposed on the first circuit board 162, the light shielding adhesive 116 can block visible light, and: the shielding glue 116 may be capable of transmitting the detection light beam 101, or the shielding glue 116 may have an opening, the detection light beam 101 may be transmitted through the shielding glue 116 from the opening, and the shielding glue 116 may be capable of transmitting or blocking the detection light beam 101. Illustratively, the masking gel 116 is made of, for example and without limitation, an infrared ink material, and is configured to transmit near infrared light and intercept visible light.

It should be noted that the number and positions of the elements of the first light emitting unit 161 and the second light emitting unit 171 in fig. 3 are only schematically shown, and the actual product may be disposed at different positions or have different numbers according to the need, which is not limited by the present invention.

The display panel 12 includes a first substrate 121, a liquid crystal layer 122, and a second substrate 123 stacked in this order from bottom to top. The portion of the first substrate 121 extending and protruding with respect 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 is located below the terminal area 1211. The second light source 17 is located under the reflective sheet 112 directly opposite to the first light source 16. The terminal region 1211 is capable of transmitting the detection light beam 101.

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

Alternatively, the first substrate 121 and the second substrate 123 may be a glass substrate, a plastic substrate, a semiconductor substrate, a metal substrate, or 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, and includes a thin film transistor array formed of a plurality of Thin Film Transistors (TFTs), and a plurality of scan lines (gate lines) and a plurality of data lines (data lines). The scan lines and data lines may be connected to a driving circuit through the terminal region 1211 or further connected to a driving circuit through the panel circuit board 124. The second substrate 123 is also called a filter substrate or a color filter substrate, and includes a plurality of red, green and blue filters arranged in an array.

Optionally, in some embodiments, the panel circuit board 124 includes a flexible substrate and conductive traces, and the detection beam is capable of transmitting through the flexible substrate between the conductive traces of the panel circuit board 124, and thus through the panel circuit board 124.

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

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

Optionally, in some embodiments, an extension portion of the second light emitting unit 171 located below the backlight module 11 has a second opening corresponding to the second light source 17. At least a portion of the second light source 17 is positioned within the second aperture 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.

Alternatively, 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, where the second light source 17 may be regarded as being located above an extension portion of the panel circuit board 124, and the extension portion of the panel circuit board 124 is located below the backlight module 11.

Alternatively, in some embodiments, the panel circuit board 124 is capable of transmitting the detection light beam 101, the second light source 17 is disposed below an extension portion of the panel circuit board 124, and the second light source 17 faces the first light source 16 in a 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 overlap with the panel circuit board 124 in the vertical direction. The integrated circuit 125 is disposed between the panel circuit board 124 and the second substrate 123. The detection beam 101 is transparent to portions of the terminal area 1211 not covered by the integrated circuit 125, including, but not limited to: the detection beam 101 is transmitted through the terminal area 1211 and the panel circuit board 124 connected to the terminal area 1211 and can further transmit through the protective cover 13; or the detection beam 101 is transmitted from the portion of the terminal area 1211 not covered by the integrated circuit 125 and the panel circuit board 124, and may further transmit through the protective cover 13.

The integrated circuit 125 is disposed on the terminal region 1211 through a COG (chip on glass) process. Optionally, the panel circuit board 124 and the terminal area 1211 are connected by conductive paste, and the integrated circuit 125 and the terminal area 1211 are connected by conductive paste. Such as, but not limited to, anisotropic conductive adhesive ACF.

Alternatively, in some embodiments, the integrated circuit 125 may be disposed on the extended portion of the panel circuit board 124 by a COF (chip on film) process. At this time, since the terminal area 1211 does not require the integrated circuit 125, the terminal area 125 may have a small width, so that the display device 10 may have a narrow non-display area, for example, the display device 10 may have a narrow bezel as viewed from the front.

In this embodiment, the detection light beam 101 may sequentially pass through the reflective sheet 112, the first light source 16, the terminal area 1211, and the protective cover 13 to be emitted to an external object. Specifically, the detection beam 101 may sequentially pass through the reflective sheet 112, the interval between the first light emitting units 161, the first circuit board 162, the light shielding glue 116, the terminal area 1211, and the protective cover 13 to be emitted onto the external object 1000.

Alternatively, in other or alternative embodiments, an anti-reflection film (not shown) is disposed on a side of the terminal area 1121 opposite to the protective cover 13, where the anti-reflection film is configured to transmit the detection light beam 101 and prevent the detection light beam 101 from being reflected, and the protective cover 13 is capable of transmitting the detection light beam 101.

Alternatively, in other or alternative embodiments, the detection beam 101 may 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 onto the external object 1000.

Alternatively, in other or alternative embodiments, the masking gel 116 may be omitted. At this time, the detection light beam 101 sequentially passes through the reflection sheet 112, the first light source 16, the terminal area 1211, the panel circuit board 124, and the protective cover 13 to be emitted to the external object 1000.

The backlight beam 100 described herein includes visible light such as, but not limited to, a beam having a wavelength in the range of 400 to 700nm (nanometers). The detection beam 101 includes invisible light including near infrared light, such as, but not limited to, a beam having a wavelength in the range of 800-1000 nm. Of course, in other or alternative embodiments, the backlight beam 100 and/or the detection beam 101 may 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 housing 111 disposed below the reflective sheet 112, where the housing 111 accommodates the reflective sheet 112, the light guide plate 113, the first light source 16, and the optical film layer 114. The housing 111 may include an iron case (not numbered) at a bottom surface and a rubber frame (not numbered) at a side surface.

The housing 111 has a first opening facing the second light source 17, the second light source 17 being at least partially disposed within 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 the external object through the second opening.

Optionally, the housing 111 may comprise a metallic material and/or plastic.

Alternatively, the housing 111 may be made of a material capable of transmitting the detection light beam 101. At this time, the housing 111 can transmit the detection light beam 101 without requiring an aperture.

Alternatively, the detection module 19 may be fixedly connected or detachably connected to the housing 111 by one or more of fastening, bolting, bonding, welding.

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

Optionally, the second light source 17 may be fixedly connected or detachably connected to the outer shell 111, and/or the middle frame 14, and/or the panel circuit board 124, and/or the reflective sheet 112 by one or more of fastening, bolting, bonding, and welding.

Optionally, the middle frame 14 is made of a material capable of transmitting the detection light beam 101, the detection module 19 is capable of receiving the detection light beam 101 through the middle frame 14, the middle frame 14 does not need to be directly open to the detection module 19, and the detection module 19 is disposed below the middle frame 14 and at least partially located in a display area of the display device 10.

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

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

Alternatively, the middle frame 14 may be omitted. At this time, the detection module 19 may be fixedly connected or detachably connected to the housing 111 by one or more of a snap, a bolt, an adhesive, and a welding.

Alternatively, referring to fig. 4, in a modified embodiment of the under-screen detection system 1, for convenience of description, the embodiment shown in fig. 4 is identical to the element labels of the embodiment shown in fig. 2, and the structure of the embodiment shown in fig. 4 is substantially the same as that of the embodiment shown in fig. 2. The difference is that the middle frame 14 has a recess facing the second light source 17, and the second light source 17 is at least partially located in the recess of the middle frame 14.

Alternatively, referring to fig. 5, in a modified embodiment of the under-screen detection system 1, for convenience of description, the embodiment shown in fig. 5 is identical to the element labels of the embodiment shown in fig. 2, and the structure of the embodiment shown in fig. 5 is substantially 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 can be converted into a corresponding electrical signal. Such as, but not limited to, image data signals that include biometric information of the external object 1000. The electrical signals may be used for biometric detection of the external object 1000, or image generation. In addition, the detection beam 101 reflected or transmitted by the external object 1000 may also be used to detect spatial coordinate information of the external object 1000, so that information such as a position, a speed, etc. of the external object 1000 can be acquired.

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

Further, the memory also stores biometric information data in advance, and the processor can perform two-dimensional and/or three-dimensional biometric detection and identification of the external object by comparing the obtained two-dimensional information and/or depth information of the external object 1000 with the pre-stored biometric information data, for example, but not limited to: two-dimensional and/or three-dimensional fingerprint detection, face detection, iris detection, subcutaneous capillary detection, and the like.

In the embodiment or the modified embodiment of the present invention, the detection Light beam 101 may include one or more of Flood Light (a Light beam with a wide irradiation area and a divergent irradiation angle), speckle structure Light, encoding structure Light, and modulated pulse signal.

The detection module 19 receives the detection light beam 101 emitted or reflected by the external object 1000 and acquires the biometric information or the image information of the external object 1000, so as to detect the biometric information of the external object 1000 and/or perform image drawing on the external object 1000 and/or detect the spatial coordinates of the external object 1000. Such as, but not limited to: fingerprint detection, body temperature detection, heart rate detection, living body detection, etc.

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

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

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 the device, verifying the online payment service, verifying the identity of a financial system or a public security system, verifying the passing of an access control system and other various products and application scenes.

The under-screen detection system 1 can also be applied to application scenes such as photographing, shooting, modeling and the like by performing two-dimensional or three-dimensional image drawing on the external object 1000.

The off-screen detection system 1 is also applicable to application scenarios involving direction, distance, speed, etc. by detecting the spatial coordinates of the external object 1000.

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

The under-screen detection system 1 may be a mobile phone, a tablet computer, a smart watch, an augmented reality/virtual reality device, a human motion detection device, an autopilot, a smart home device, a security device, a smart robot or a component thereof.

In contrast to the prior art, the under-screen detection system 1 of the present invention comprises a second light source 17, said second light source 17 being located directly below said first light source 16, directly above said first light source 16. The first light source 16 provides a backlight beam 100 for the display device 10 to display images normally, and the second light source 17 provides a detection beam 101 for off-screen detection for the detection module 19. The detection beam 101 may be invisible light, and the detection beam 101 may be capable of transmitting through the display device 10, and at this time, the emission and the reception of the detection beam 101 do not affect the normal image display of the display device 10, so that the off-screen detection system 1 can better implement off-screen detection on the external object 1000, including but not limited to off-screen biometric 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 housing 111. The second light source 17 may also be connected to the middle frame 14. The space below the reflective sheet 112 and the backlight module 11 is sufficient to accommodate the second light source 17, and the second light source 17 uses the existing space of the display device 10 to implement the arrangement of the light source of the detection light beam 101, so that the space of the display device 10 is not occupied additionally, and the practicability and applicability are good.

Referring to fig. 6, in one embodiment of the present invention, the under-screen detection system 2 includes a display device 20 and a detection module 29 disposed below the display device 20. The detection module 29 is capable of receiving the detection beam 201 reflected or transmitted by the external object through at least part of the display area of the display device 20. In this embodiment, the detection beam 201 is, for example and without limitation, near infrared light. In other or alternative embodiments, the detection beam 201 includes visible and/or invisible light.

The display device 20 comprises a backlight module 21, a display panel 22 positioned above the backlight module 21, and a protective cover plate 23 positioned above the display panel 22. The display device 20 has a display area capable of displaying an image and a non-display area located around the display area. The display panel 22 is used for displaying images, and the backlight module 21 is used for providing backlight beams required by image display for the display panel 21. 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 disposed above the reflective sheet 212, an optical film layer 214 disposed above the light guide plate 213, a first light source 26 disposed on one side of the light guide plate 213, and a second light source 27 disposed below the reflective sheet 212 and opposite to the first light source 26. The first light source 26 is configured to emit a backlight light beam 200, the backlight light beam 200 being provided to the display panel 22 to effect image display. The second light source 27 is arranged to emit a detection light beam 201, which detection light beam 201 is arranged for biometric detection and/or image generation and/or spatial position detection of the external object 1000. 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 disposed opposite to each other, and a side surface disposed between the bottom surface and the top surface and facing the first light source 26. The first light source 26 is configured to emit a backlight beam 200 of visible light toward 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 for guiding the backlight beam 200 entering from the side to the upper optical film layer 214.

The reflecting sheet 212 is used for reflecting 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 to diffuse and/or lighten the backlight beam 200 from the light guide plate 213 and further provide the backlight beam 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 in close contact with the first circuit board 262.

The backlight module 21 further includes a shading adhesive 216 disposed above the first circuit board 262. The light shielding adhesive 216 covers the first circuit board 262. Optionally, in some embodiments, the light shielding glue 216 may cover a portion of the light guide plate 213 and/or the optical film layer 214. The light blocking glue 216 can prevent the backlight beam 200 and other visible light from penetrating. In this embodiment, the light shielding glue 216 is capable of transmitting the detection light beam 201. Optionally, in some embodiments, the shading adhesive 216 is made of a material that can transmit the detection beam 201 and block 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 shading adhesive 216 is infrared ink. Optionally, in some embodiments, the light shielding glue 216 has an opening for the detection beam 201 to pass through. Thus, the light blocking glue 216 can block the backlight beam and transmit the detection beam, or: the shielding glue 216 has an opening for the detection light beam 201 to pass through, and the shielding glue 216 transmits or blocks the detection light beam 201.

The second light source 27 is configured to emit a detection light beam 201 to an upper side of the protective cover plate 23. The detection light beam 201 can pass through the reflection 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 plate 23 or be spaced apart from the protective cover plate 23.

In this embodiment, the display device 20 further includes an optical coating layer 231 disposed on the lower surface of the protective cover 23, where the optical coating layer 231 corresponds to a non-display area of the display device 20. The optical coating 231 is capable of transmitting the detection beam 201 and intercepting the backlight beam 200 or other visible light beam. The detection beam 201 can pass through the reflection 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 an infrared ink, the detection beam 201 is near infrared light, the backlight beam 200 is visible light, and the infrared ink is used for transmitting near infrared light and absorbing visible light.

Alternatively, in other or alternative embodiments, the optical coating 231 may be omitted.

Alternatively, in other or alternative embodiments, the optical coating 231 may be integrated into 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 this 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 film substrate. The first substrate 221 has a terminal area 2211 extending outwardly along one 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 polarizing plate 225, and the lower polarizing plate 224 are disposed substantially corresponding to the display area of the display device 40.

The lower and upper polarizers 224, 225 have different polarization directions, and the backlight beam 200 having a specific polarization direction is allowed to exit after the backlight beam 200 enters the lower polarizer 224. When the backlight beam 200 having the specific polarization direction passes through the liquid crystal layer 222, the backlight beam is deflected by the liquid crystal molecules of the liquid crystal layer 222, and can be emitted from the upper polarizer 225.

The display panel 22 further includes a panel circuit board 224, and a portion of the panel circuit board 224 is connected to an edge portion of the terminal area 2211 and is bent outwards 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 comprises a flexible circuit board and/or a printed circuit board.

Optionally, in some embodiments, an extension of the panel circuit board 224 corresponds 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 portion of the second light source 27 is located in the opening of the extended portion of the panel circuit board 224 and is disposed under the reflective sheet 212 directly opposite to the first light source 26.

Alternatively, in some embodiments, the panel circuit board 224 may extend from below the second light source 27 and cover a lower surface of the second light source 27. The second light source 27 may be considered to be located above the extended portion of the panel circuit board 224 at this time. 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 is capable of transmitting the detection beam 201. The second light source 27 is disposed below the extended portion of the backlight module 21 of the panel circuit board 224, and the second light source 27 faces the first light source 26 in a vertical direction (up-down direction in fig. 6).

Optionally, in some embodiments, a portion of the panel circuit board 224 connected to the terminal area 2212 has an opening through which the detection light beam 201 passes, or a portion of the panel circuit board 224 connected to the terminal area 2212 can pass the detection light beam 201.

The display panel 22 further includes an integrated circuit 225, and the integrated circuit 225 is 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 on glass) process. Alternatively, the integrated circuit 225 may be disposed on the folded extension portion of the panel circuit board 224, and in this case, the integrated circuit 225 may be disposed on the folded extension portion of the panel circuit board by a COF (chip on film) process. The integrated circuit 225 may be a display driver circuit and/or a touch detection circuit.

The detection light beam 201 may 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 the external object 1000; or the detection beam 201 may 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 beam 201 is emitted from the second light source 27 until reaching the external object 1000, and needs to pass through a plurality of different film layers of the backlight module 21 and the display panel 22. For example, but not limited to, a portion of the detection beam 201 may reflect at the terminal area 2211 when the detection beam 201 passes through the terminal area 2211. The detection beam 201 may reflect at the panel circuit board 224 when a part of the detection beam 201 passes through the panel circuit board 224. The detection beam 201 may reflect a portion of the detection beam 201 when passing through the protective cover plate 23, thereby protecting the protective cover plate 23. The detection beam 201 may also enter the display area of the display device 20 and may be reflected at the lower and/or upper polarizers 224, 225.

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

Accordingly, in order to prevent the reflected interference beam of the detection beam 201 from being received by the detection module 29 after the partial detection beam 201 is reflected by the terminal area 2211 while passing through the terminal area 2211, the backlight module 21 may further include a light blocking film 218. The photoresist film 218 is located under the display panel 22. Specifically, the photoresist film 218 is partially disposed over the light blocking adhesive 216 and partially disposed over the optical film layer 214. The light blocking film 218 is used to absorb the detection beam 201 of the reflected disturbing light.

It should be noted that, in the present embodiment, the detection beam 201 may pass through the terminal area 2211 at different positions, including but not limited to, the detection beam 201 may pass through the terminal area 2211 between the integrated circuit 225 and the second substrate 223, or the detection beam 201 may pass through a junction between the panel circuit board 224 and the terminal area 2211.

In other or alternative embodiments, the detection beam 201 may be disposed such that it passes through a specific location or region of the terminal area 2211. For example, but not limited to, a portion of the light shielding adhesive 216 near the display area is capable of transmitting the detection light beam 201, and a portion far from the display area is not capable of transmitting the detection light beam 201. At this time, the detection beam 201 can only pass through the portion of the light shielding adhesive 216 adjacent to the display area of the display device 20, project upward, pass through the portion of the terminal area 2211 adjacent to the display area, exit to the protective cover 23, and further pass through the protective cover 23. Alternatively, the lower surface of the terminal area 2211 is coated with an optical coating so that the detection beam 201 is transmitted through a specific position or area of the terminal area 2211. The embodiment of the present invention is not limited thereto.

Alternatively, referring to fig. 7, which is a schematic partial cross-sectional view of an alternative embodiment of the under-screen detection system 2, for convenience of description, the element numbers of the embodiment shown in fig. 7 are consistent with those of fig. 6. The embodiment shown in fig. 7 is substantially identical to the structure and function of the under-screen detection system 2 shown in fig. 6, except that the detection module 29 has a corresponding second field area on the top surface of the light guide plate 213, and the light blocking film 218 is disposed above the light guide plate 213 in an area other than the corresponding second field 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 region of the display device 20 and partially located in the non-display region. Alternatively, the light blocking film 218 may be entirely located in the display area of the display device 20.

Alternatively, referring to fig. 8, which is a schematic partial cross-sectional view of an alternative embodiment of the under-screen detection system 2, for convenience of description, the element numbers of the embodiment shown in fig. 8 are consistent with those of fig. 6. The embodiment shown in fig. 8 is substantially identical in structure and function to the off-screen 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 a non-display area of the display device 20. The anti-reflection film 228 is used to reduce or prevent the detection light beam 201 from being reflected when passing through the terminal area 2211, thereby further reducing the reflection interference light of the detection light beam 201.

The anti-reflective film 228 and/or the light blocking film 218 in the embodiment shown in fig. 6-8 may be used in the embodiment and the modified embodiment of the present invention, where the position and arrangement of the anti-reflective film 228 and/or the light blocking film 218 may be different, for example, but not limited to, the anti-reflective film 228 may also be at least partially located in the display area, and the light blocking film 218 may also belong to the display panel 22. The embodiment of the present invention is not limited thereto.

The structures and components of the housing 111, the middle frame 14, etc. of the embodiment of fig. 2-5 can also be applied to the embodiment of fig. 6-8, as well as other or alternative embodiments of the present invention. The embodiment of the present invention is not limited thereto.

In contrast to the prior art, the off-screen detection system 2 of the present invention comprises a second light source 27, the second light source 27 being located directly below the first light source 26, opposite the first light source 26. The first light source 26 provides a backlight beam 200 for the display device 20 to display images normally, and the second light source 27 provides a detection beam 201 for off-screen detection for the detection module 29. The detection beam 201 may be invisible light, and the detection beam 201 may be transmitted through the display device 20, where the emission and reception of the detection beam 201 does not affect the normal image display of the display device 10. The off-screen detection system 1 is thus capable of better enabling off-screen detection of external objects 1000, including but not limited to off-screen biometric detection, image generation, spatial position detection, etc. The second light source 27 uses the existing space of the display device 20 to implement the arrangement of the light source of the detection light beam 201, without occupying the space of the display device 20, and 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 receiving and collecting effects of the detection module 29 on the detection light beam 201, so that the under-screen detection effect is better.

It should be understood by those skilled in the art that, without any inventive effort, some or all of the embodiments of the present invention and some or all of the modifications, substitutions, alterations, permutations, combinations, extensions and the like of the embodiments are considered to be covered by the inventive concept of the present invention, and are within the scope of the present invention.

It should be noted that, in the description of the present application, the light emitting surface, the side surface, the top surface, the upper surface, the lower surface, and the like may be surfaces that exist physically or may be imaginary surfaces, and are not necessarily required to exist actually, and all are considered to be within the scope of the invention of the present application.

The above embodiments and modified embodiments of the present application describe the under-screen detection system in different situations, and the backlight module, the display panel and other structures thereof. It will be appreciated by those skilled in the art that in order to enable the display device to have a higher screen duty cycle while enabling the detection of the on-screen biometric feature, the second light source for emitting the detection light beam may be disposed below the first light source, or utilize the existing space inside the display device, so that the display device may achieve a better on-screen biometric feature detection effect while having a higher screen duty cycle and visual effect. The embodiment or the change embodiment of the invention is subjected to change settings such as disassembly, combination, deformation, scaling, limited tests and the like, and all belong to the protection scope of the invention.

It should be noted that the structures, functions, principles and arrangements of the light sources (16, 26), the backlight modules (11, 21), the display panels (12, 22), the terminal areas (1211, 2211), the light shielding films (116, 216), the light blocking film 218, the anti-reflection film 228 and the like in the above embodiments or modified embodiments and corresponding modified arrangements of the present invention can also be applied to other embodiments disclosed herein, and thus all the resulting embodiments and substitutions, modifications, combinations, splitting, extensions thereof are included in the scope of the present invention.

Alternatively, in each of the above embodiments, the second light source may be disposed between the reflective sheet and the first light source. In addition, the detection light beam can bypass from one side of the display panel through the light guide element after passing through the interval between the first light emitting units and then pass through the cover plate, that is, there is an embodiment that the detection light beam does not need to pass through the display panel in the process of passing through the cover plate.

Further, in the above embodiment, the second light source transmits the detection light beam mainly through the interval between the first light emitting units, however, alternatively, the second light source may transmit the detection light beam through the first light emitting unit itself, for example, and thus, it is also possible that the second light source falls within the protection scope of the present application.

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

The references to "length", "width", "upper", "lower", "left", "right", "front", "rear", "back", "front", "vertical", "horizontal", "top", "bottom", "interior", "exterior", etc., as may be made in this specification are merely for convenience in describing embodiments of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention. Like reference numerals and letters designate like items in the drawings, and thus once an item is defined in one drawing, no further definition or explanation thereof is necessary in the subsequent drawings. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance. In the description of the present invention, the meaning of "plurality" or "plurality" means at least two or two, unless specifically defined otherwise. In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, or may be internal communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. The terms used in the following claims should not be construed to limit the invention to the specific embodiments disclosed in the specification. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a detection system under screen, its characterized in that, includes display device and detection module, the detection module can see through the at least part of display device receives from outside object transmission or/and reflected detection light beam and converts the detection light beam that receives into corresponding signal of telecommunication, display device includes by supreme backlight unit, display panel and the protection apron that sets gradually down, backlight unit includes:

the light guide plate comprises a top surface, a bottom surface and a side surface, wherein the top surface and the bottom surface are oppositely arranged;

a first light source including a plurality of first light emitting units adjacent to a side surface of the light guide plate, the plurality of first light emitting units being connected to each other or having a space between at least a portion of adjacent first light emitting units, the plurality of first light emitting units being configured to emit backlight beams toward the side surface, the backlight beams entering an inside of the light guide plate from the side surface and exiting from a top surface of the light guide plate to the display panel, for providing visible beams for image display of the display panel;

And a second light source located below the first light source, the second light source being configured to emit a detection light beam toward an upper side of the protective cover plate, the detection light beam being capable of passing through the plurality of first light emitting units themselves and/or intervals between the plurality of first light emitting units, and the protective cover plate to reach an external object, the detection light beam being used for biometric detection of the external object, a wavelength of the detection light beam being different from a wavelength of the backlight light beam.

2. The under-screen detection system of claim 1, wherein the detection module is disposed at least partially directly below the backlight module opposite to a display area of the display device; or the detection module is at least partially positioned inside the display device.

3. The under-screen detection system of claim 2, wherein the detection module is located at least partially inside the display device comprising: the detection module is at least partially positioned on one side of the backlight module, and/or the detection module is at least partially positioned on one side of the display panel, and/or the detection module is at least partially positioned on one side of the protective cover plate, and/or the detection module is at least partially positioned below the protective cover plate, and/or the detection module is at least partially positioned between the protective cover plate and the display panel, and/or the detection module is at least partially positioned between the display panel and the backlight module.

4. The under-screen detection system of claim 1, wherein the second light source is disposed at least directly opposite the plurality of first light emitting units themselves and/or the spacing regions between adjacent first light emitting units.

5. The under-screen detection system of claim 4, wherein when at least some of the plurality of first light emitting units are spaced apart, a spacing between adjacent first light emitting units is at least 1 millimeter.

6. The under-screen detection system of claim 1, wherein the backlight module further comprises a reflective sheet positioned below the light guide plate and the first light source, and the backlight beam exiting from the bottom surface of the light guide plate can be reflected back into the light guide plate by the reflective sheet; the second light source is right opposite to the first light source and is positioned below the reflecting sheet, the detection light beam can penetrate through the reflecting sheet, the intervals among the plurality of first light emitting units, the display panel and the protective cover plate to reach an external object, and the detection light beam is used for detecting the biological characteristics of the external object, wherein the wavelength of the detection light beam is different from that of the backlight light beam.

7. The under-screen detection system of claim 6, wherein the second light source has a light exit surface facing the reflective sheet, the detection light beam exiting from the light exit surface.

8. The under-screen detection system of claim 6, wherein the reflective sheet has an aperture facing the second light source through which the detection beam exits or is transmissive.

9. The under-screen detection system of claim 6, wherein the backlight module further comprises a housing below the reflective sheet, the housing containing the reflective sheet, the light guide plate, and the first light source, the second light source being below the housing, the housing being transparent to the detection light beam; or, the shell is provided with an opening, the second light source is arranged under the shell right against the opening, or at least partially positioned in the opening, and the detection light beam emitted by the second light source can penetrate through the shell from the opening and reach the reflecting sheet.

10. The under-screen detection system of claim 1, wherein the display device has a display area for displaying an image 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.

11. The under-screen detection system of claim 1, wherein the backlight module further comprises a shading adhesive disposed above the first light source, the shading adhesive being capable of blocking visible light, and: the shading glue can transmit the detection light beam, or the shading glue is provided with an opening, the detection light beam penetrates through the shading glue from the opening, and the shading glue can transmit or block the detection light beam.

12. The under-screen detection system of claim 1, wherein the first light source further comprises a first circuit board electrically connected to the plurality of first light emitting units, the first circuit board configured to provide driving signals to the plurality of first light emitting units, the plurality of first light emitting units disposed under the first circuit board proximate to the first circuit board, the detection beam being transparent to the first circuit board.

13. The under-screen detection system of claim 12, wherein the plurality of first light emitting units are adjacent to a side of the light guide plate, the first circuit board is adjacent to a side of the light guide plate, or the light guide plate further comprises a transition surface connecting the side and the top surface, at least a portion of the first circuit board is located on the transition surface of the light guide plate, the transition surface comprises a horizontal plane, and/or a sloping surface, and/or a cambered surface, and a thickness of the light guide plate at the top surface is less than or equal to a thickness of the light guide plate at the transition surface.

14. The under-screen detection system of claim 6, wherein the second light source includes a plurality of second light emitting units disposed under the reflective sheet opposite to a space between adjacent first light emitting units, the second light emitting units for emitting the detection light beam toward the protective cover plate.

15. The under-screen detection system of claim 14, wherein the first light-emitting unit comprises a first light-emitting surface opposite to the light guide plate, and an included angle between the backlight beam and a normal line of the first light-emitting surface is not greater than 60 degrees; the second light-emitting unit comprises 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 line of the second light-emitting surface is not more than 60 degrees.

16. The under-screen detection system of claim 1, wherein the display panel includes a first substrate, a second substrate disposed opposite to the first substrate, and a liquid crystal layer disposed between the first substrate and the second substrate, the portion of the first substrate extending and protruding with respect to an edge of the second substrate is a terminal area, the terminal area is located in a non-display area of the display device, the first light source is located directly below the terminal area, the second light source is located below the first light source, and the terminal area is capable of transmitting the detection light beam.

17. The under-screen detection system of claim 16, wherein the display panel further comprises a panel circuit board, one end of the panel circuit board is connected to an edge portion of the terminal area and bent downwards to extend below the backlight module, the panel circuit board is provided with an opening for the detection light beam to pass through, or the panel circuit board can transmit the detection light beam, and the detection light beam passes through the first light source, the terminal area and the protective cover plate to be emitted to an external object.

18. The under-screen detection system of any one of claims 1-17, wherein the detection beam comprises near-infrared light.

19. The under-screen detection system of claim 16, wherein the protective cover has a lower surface opposite the display panel and an upper surface facing away from the display panel, the detection module having a first field of view area on the upper surface of the protective cover, at least a portion of the first field of view area being located in a display area of the display device; the detection module is provided with a second view field area on the top surface of the light guide plate, and the detection module receives detection light beams transmitted from the second view field area; the backlight module further comprises a light blocking film, wherein the light blocking film is used for transmitting backlight light beams and intercepting detection light beams reflected to the backlight module by the terminal area, at least one part of the light blocking film is positioned in a display area of the display device, or the light blocking film is positioned above an area, except the second view field area, of the top surface of the light guide plate.

20. An off-screen detection system as claimed in claim 1, wherein the detection module is arranged to obtain a biological characteristic of the external object from the converted electrical signal, and/or to generate an image of the external object, and/or to detect spatial coordinates of the external object.