CN210155683U

CN210155683U - Biological characteristic detection system and display device and backlight module thereof

Info

Publication number: CN210155683U
Application number: CN201920946473.9U
Authority: CN
Inventors: 朱文龙; 周扬
Original assignee: Shenzhen Fushi Technology Co Ltd
Current assignee: Shenzhen Fushi Technology Co Ltd
Priority date: 2019-06-23
Filing date: 2019-06-23
Publication date: 2020-03-17
Anticipated expiration: 2029-06-23

Abstract

The utility model discloses a backlight module, include the light guide plate and be located the light source of light guide plate side, the light source includes luminescence unit, luminescence unit has the first play plain noodles of first normal direction and has the second play plain noodles of second normal direction, preset angle has between first normal direction and the second normal direction, first play plain noodles is used for the outgoing light beam in a poor light, the second goes out the plain noodles and is used for outgoing measuring beam, light beam in a poor light passes through the light guide plate provides a display panel and is used for image display, measuring beam can see through display device reachs external object, measuring beam is used for detecting external object's biological characteristic information. The utility model also provides a display device and biological characteristic detecting system, the utility model discloses have biological characteristic detection effect and better user experience under the better screen.

Description

Biological characteristic detection system and display device and backlight module thereof

Technical Field

The utility model relates to the field of photoelectric technology, especially, relate to a backlight unit, display device and biological characteristic detecting system.

Background

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

Recently, in order to achieve full-screen or nearly full-screen effect, under-screen biometric detection technology has come into use, that is, a biometric detection unit is placed below a display screen, and a detection light beam is sent or emitted through the display screen to achieve biometric detection.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a backlight unit, display device and biological characteristic detecting system that can be used for biological characteristic to detect under the screen for solving prior art problem.

An aspect of the utility model provides a backlight module, include the light guide plate and be located the light source of light guide plate side, the light source includes luminescence unit, luminescence unit has the first play plain noodles of first normal direction and has the second play plain noodles of second normal direction, preset angle has between first normal direction and the second normal direction, first play plain noodles is used for the outgoing backlight beam, the second goes out the plain noodles and is used for outgoing detection light beam, backlight beam passes through the light guide plate provides a display panel and is used for image display, detection light beam can see through display device reachs external object, detection light beam is used for detecting external object's biological characteristic information.

In some embodiments, the light guide plate includes a top surface and a side surface, the first light emitting surface faces the side surface, the side surface is a light incident surface of the light guide plate, the top surface is a light emitting surface of the light guide plate, the light emitting unit emits a backlight beam from the first light emitting surface to a side, the backlight beam enters the light guide plate from the side surface and exits from the top surface, and the backlight beam is provided to the display panel for image display.

In some embodiments, the display panel has a display area and a non-display area located around the display area, the display area is used for displaying images, the non-display area is not used for displaying images, the light emitting unit emits a detection light beam upward from the second light emitting surface, and the detection light beam transmits through the display panel from the non-display area.

In some embodiments, the predetermined angle is 90 degrees, acute angle, or obtuse angle.

In some embodiments, a detection module located below the backlight module is capable of receiving an imaging beam through the backlight module, the imaging beam including: the detection light beam reflected by the external object and/or the detection light beam transmitted by the external object, wherein the transmission refers to that the external object transmits the detection light beam entering the external object as an imaging light beam, at least one part of the detection module is positioned in the display area of the display panel, and the detection module at least receives the imaging light beam from the display area.

In some embodiments, the backlight module further includes a reflective sheet disposed below the light guide plate, the light guide plate includes a bottom surface facing the reflective sheet, the bottom surface and the top surface are disposed opposite to each other, and the reflective sheet is configured to reflect the backlight beam emitted from the bottom surface of the light guide plate back into the light guide plate; the reflective sheet is capable of transmitting the imaging light beam.

In some embodiments, the backlight module further comprises an optical film layer disposed over the light guide plate, the optical film layer for diffusing and/or brightening the backlight beam; the backlight beam enters the display panel after penetrating through the optical film, the optical film layer comprises a diffusion film and/or a brightness enhancement film, and the number of the diffusion film and/or the brightness enhancement film is one or more.

In some embodiments, the backlight module further includes an iron case located below the reflector plate, the iron case is used for supporting and protecting other components of the backlight module, the iron case has an opening, the detection light beam reflected or transmitted by an external object can be received by a detection module through the opening, and the detection module is disposed below the iron case opposite to the opening.

In some embodiments, the number of the light emitting units is one or more, and the first light emitting surface of the light emitting unit is disposed opposite to the side surface of the light guide plate.

In some embodiments, the light emitting unit is disposed at least corresponding to a middle portion of the side surface, or the light emitting unit is disposed at least corresponding to two ends of the side surface, or the light emitting unit is disposed corresponding to the entire area of the side surface.

In some embodiments, the light source further includes a backlight circuit board, the light emitting unit is located below the backlight circuit board, the backlight module further includes a rubber frame, the rubber frame is located on one side of the light source away from the light guide plate, the backlight circuit board is partially located on the rubber frame and partially located on the light guide plate, and a light shielding rubber is disposed above the backlight circuit board, the rubber frame, and the light guide plate, wherein: at least partial area of the light shading glue can transmit the detection light beam, and the light shading glue blocks the backlight light beam and other wavelength light beams; or the light shielding glue is provided with an opening through which the detection light beam penetrates.

In some embodiments, the light source further includes a backlight circuit board, the light emitting unit is located above the backlight circuit board, the light emitting unit further has a bottom surface opposite to the second light emitting surface, and the bottom surface of the light emitting unit is tightly attached to the upper surface of the backlight circuit board.

In some embodiments, the first normal direction is parallel to a horizontal direction, the second normal direction is perpendicular to the first normal direction, or an acute angle or an obtuse angle is formed between the second normal direction and the first normal direction.

In some embodiments, the light emitting unit includes a first light emitting element for emitting the backlight beam and a second light emitting element for emitting the detection beam integrated in one package.

In some embodiments, the backlight beam is visible light, and the detection beam is invisible light, the invisible light including near-infrared light.

An aspect of the present invention provides a display device, including the above-mentioned backlight module.

In some embodiments, the display device further includes a display panel disposed above the backlight module, the display panel has a terminal region extending to an outside portion along a bottom edge, the terminal region is located in a non-display region of the display panel, a light source of the backlight module is located below the terminal region, a detection light beam emitted by the light source can pass through the terminal region, and the terminal region has an opening for passing through the detection light beam or can transmit the detection light beam.

In some embodiments, the display panel further comprises an anti-reflection film disposed under the terminal area, the anti-reflection film being configured to prevent reflection of the detection beam.

In some embodiments, the display panel further includes a panel circuit board, the panel circuit board is partially connected to the terminal area and is bent outward to extend below the backlight module, and the detection beam can penetrate through the terminal area and the panel circuit board, wherein: the panel circuit board is provided with an opening for transmitting the detection light beam; or the panel circuit board is made of a material capable of transmitting the detection beam; or the panel circuit board comprises a conductive circuit and a flexible substrate, the flexible substrate transmits the detection light beam, and the detection light beam penetrates through the flexible substrate from the gap of the conductive circuit so as to penetrate through the panel circuit board.

In some embodiments, the display panel further includes a first substrate, a liquid crystal layer, and a second substrate disposed from bottom to top, where an outward extending protruding portion of the first substrate relative to an edge of the second substrate is the terminal area, and the display panel further includes an integrated circuit, where the integrated circuit is located on the terminal area or on a bent extending portion of the panel circuit board; when the integrated circuit is arranged on the terminal area, the detection light beam penetrates through the terminal area between the integrated circuit and the second substrate and is emitted outwards, or/and the detection light beam penetrates through the terminal area connected with the panel circuit board and is emitted outwards.

In some embodiments, the display panel includes a lower polarizer, a first substrate, a liquid crystal layer, a second substrate, and an upper polarizer, which are sequentially disposed from bottom to top, where a portion of the first substrate protruding from an edge of the second substrate is the terminal area, and the backlight module further includes a light blocking diaphragm, where a portion of the light blocking diaphragm is located in the non-display area and/or a portion of the light blocking diaphragm is located in the display area of the display device, and the light blocking diaphragm is located below the display panel.

In some embodiments, a detection module is capable of transmitting light to the display device to receive an imaging light beam reflected and/or transmitted by an external object, the detection module has a viewing angle for receiving the imaging light beam, the light guide plate has a viewing area corresponding to the viewing angle, the viewing area is an area surrounded by the viewing angle with the detection module as a vertex on the top surface of the light guide plate, and the photoresist membrane covers a portion of the top surface of the light guide plate outside the viewing area.

In some embodiments, the display device further includes a protective cover plate located above the display panel, the protective cover plate covering the terminal area, the detection beam being capable of penetrating through the protective cover plate, and the protective cover plate is made of a transparent material, and the transparent material includes transparent glass or transparent sapphire.

One aspect of the present invention provides a biological feature detecting system, which includes the backlight module or the display device.

The beneficial effects of the utility model reside in that, light source through backlight unit provides backlight beam and measuring beam simultaneously for the light source of the measuring beam that the transmission biological characteristics detected does not occupy the extra display area space of display device or non-display area space. The utility model discloses can realize that biological characteristic detects under the screen to do not influence display device and normally show. Further, the light source may be different light emitting chips for emitting the backlight beam and the detection beam integrated in one package, or light emitting chips for emitting the backlight beam and the detection beam respectively arranged using the space under the screen of the existing display device. The utility model discloses biological characteristic detecting system and display device, backlight unit thereof have biological characteristic detection effect and better user experience under the better screen.

Drawings

FIG. 1 is a schematic perspective view of one embodiment of the biometric detection system of the present invention;

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

FIG. 3 is a schematic partial cross-sectional view of a modified embodiment of the biometric detection system shown in FIG. 1;

FIGS. 4A-4C are schematic diagrams of different embodiments of the light source shown in FIG. 3;

FIG. 5 is an enlarged schematic view of a portion of the terminal area shown in FIG. 3;

FIG. 6 is a schematic partial cross-sectional view of the biometric detection system shown in FIG. 1;

FIG. 7 is a schematic view of a modified embodiment of the light source shown in FIG. 6;

FIG. 8 is a schematic partial cross-sectional view of one embodiment of the biometric sensing system of the present invention;

FIGS. 9A-9B are schematic diagrams of the light source shown in FIG. 8;

FIG. 10 is a schematic partial cross-sectional view of one embodiment of the biometric sensing system of the present invention;

FIG. 11 is a schematic partial cross-sectional view of one embodiment of the biometric sensing system of the present invention;

fig. 12 is a schematic partial cross-sectional view of one embodiment of the biometric sensing system of the present invention.

Detailed Description

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

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

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 application. One skilled in the relevant art will recognize, however, that the subject technology can be practiced without one or more of the specific details, or with other structures, components, and so forth. In other instances, well-known structures or operations are not shown or described in detail to avoid obscuring the focus of the application.

Referring to fig. 1, in an embodiment of the biometric detection system 1 of the present invention, the biometric detection system 1 includes a display device 10. The display device 10 has a display Area (AA Area) for displaying an image and a non-display Area surrounding the display Area. Alternatively, the display area and the non-display area may have other shapes or positions, for example, but not limited to, the display device 10 has a display area and a non-display area on the back, and/or the front, and/or the side; or the non-display area does not surround the display area. The embodiment of the utility model provides a do not make the restriction.

Referring to fig. 2, a partial cross-sectional view of the biometric detection system 1 along the line B-B in fig. 1 is shown according to an embodiment of the present invention. The display device 10 includes a backlight module 11, a display panel 12 and a protective cover plate 13, which are sequentially arranged from bottom to top. The backlight module 11 includes a light source 16 and a light guide plate 113, the light source 16 is disposed below the display panel 12, and the light guide plate 113 is disposed below the display panel 12. The light guide plate 113 is disposed at a side of the light source 16. The light source 16 and the light guide plate 113 are located at substantially the same layer in the left-right direction in fig. 2. The protective cover 13 covers the display panel 12 and the backlight module 11. The protective cover 13 is made of a transparent material, such as but not limited to: glass or sapphire.

The light source 16 is arranged to emit a backlight beam 100 in a first direction and a detection beam 101 in a second direction. The first direction and the second direction have a preset spatial angle range. Optionally, the preset spatial angle range includes a 90-degree angle, an acute angle and an obtuse angle. In this embodiment, the first direction is, for example, a direction in which the light source 16 faces a side of the light guide plate 113, and the second direction is, for example, a direction above the light source 16. It should be noted that the first direction and the second direction may be a set of directions including a plurality of different angles, and are not limited to a direction of a specific angle.

Optionally, in some embodiments, the light source 16 has a first light emitting surface with a first normal direction and a second light emitting surface with a second normal direction. A preset angle is formed between the first normal direction and the second normal direction, the first light emitting surface is used for emitting the backlight beam 100, and the second light emitting surface is used for emitting the detection beam 101. The preset angle is a 90-degree angle, an acute angle or an obtuse angle.

In this embodiment, the backlight beam 100 is emitted from a side of the light source 16, enters the light guide plate 113, exits from above the light guide plate 113, and enters the display panel 12. The backlight beam 100 is used to provide the display panel 12 to perform image display. The detection light beam 101 can pass through the display panel 12 and the protective cover 13 to reach an external object 1000, and the detection light beam 101 is used for detecting the biological characteristics of the external object 1000.

The biometric detection system 1 further comprises a detection module 19 disposed below the display device 10. The detection module 19 is capable of receiving the imaging light beam 102 through the display device 10. The imaging light beam 102 is the detection light beam 101 reflected by the external object 100 and/or the detection light beam 101 transmitted by the external object 1000. Wherein the transmitting includes the external object 1000 transmitting the detection beam 101 entering the inside thereof as the imaging beam 102. The imaging beam 102 carries biometric information of the external object 1000.

The display panel 12 and the protective cover 13 have better transmittance for the detection light beam 101 and the imaging light beam 102. It should be noted that the better transmittance is relative to the optical imaging effect when the imaging light beam 102 received by the detection module 19 is used for detecting the biological features of the external object 1000. The transmittance of the display panel 12 for the detection light beam 101 and the imaging light beam 102 is, for example and without limitation, about 50%, and the transmittance of the protective cover 13 for the detection light beam 101 and the imaging light beam 102 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.

In some embodiments, the backlight module 11 further includes an iron case (not shown in fig. 2) under the light source 16 and the light guide plate 112, the iron case has an opening, and the detection module 19 is disposed under the backlight module 11 corresponding to the opening of the iron case.

In some embodiments, the backlight module 11 further includes a plastic frame (not shown in fig. 2) surrounding the light source 16 and the light guide plate 112, and a light shielding plastic (not shown in fig. 2) is disposed over the plastic frame and the light source 16. The light blocking glue can block the backlight beam 100 or other visible light, and the light blocking glue has an opening for the detection beam 101 to pass through, or the light blocking glue is made of a material that can transmit the detection beam 101 and block the backlight beam 100.

In this embodiment, the detection module 19 receives the imaging light beam 102 through the display device 10. The imaging light beam 102 carries the biometric information of the external object 1000, so that the biometric information of the external object 1000 is acquired by the detection module 19, and the biometric detection system 1 can detect the biometric information of the external object 1000.

The light source 16 of the backlight module 11 provides the backlight beam 100 and the detection beam 101 at the same time, and the light source 16 does not occupy the extra display area space or the non-display area space of the display device. The utility model discloses can realize that biological characteristic detects under the screen to do not influence display device 10 and normally show. Further, the light source 16 may be different light emitting chips (bare chips) emitting the backlight beam 100 and the detection beam 101 integrated in one package, or light emitting chips for emitting the backlight beam 100 and the detection beam 101, respectively, using the existing under-screen space arrangement of the display device 10. The utility model discloses biological characteristic detecting system and display device, backlight unit thereof have biological characteristic detection effect and better user experience under the better screen.

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 and the imaging beam 102 are invisible light, and the invisible light includes near infrared light. The detection beam 101 and the imaging beam 102 are, for example, near-infrared beams.

Illustratively, the visible light includes a beam having a wavelength in the range of 400 to 700nm (nanometers). The near infrared light includes a light beam having a wavelength range of 800-1000 nm. The detection beam 101 and the imaging beam 102 are, for example, beams having a wavelength of 850nm or 940 nm.

Accordingly, the light blocking glue is made of, for example but not limited to, an infrared ink material, and is used for transmitting near infrared light and blocking visible light.

Please refer to fig. 3, which is a partial cross-sectional view of another embodiment of the biometric detection system 1. The biological characteristic detection system 1 comprises a display device 10 and a detection module 19 arranged below the display device 10. The detection module 19 is configured to receive the imaging light beam 102 through the display device 10. The imaging light beam 102 is received by the detection module 19 and converted into a corresponding electrical signal, for example: an image data signal including biometric information of the external object 1000. The imaging beam 102 and the detection module 19 can be used for biometric detection of the external object 1000.

The display device 10 includes a backlight module 11, a display panel 12 and a protective cover plate 13, which are sequentially arranged from bottom to top. The display panel 12 is used for displaying images and can provide a contact type or non-contact type human-computer interaction interface for a user. The backlight module 11 is configured to provide a backlight beam required for image display for the display panel 12, and emit a detection beam 101 to an external object 1000. The detection beam 101 can be used for biometric detection of the external object 1000. The imaging beam 102 includes, but is not limited to: the detection light beam 101 reflected by the external object 1000, and/or the detection light beam 101 transmitted by the external object 1000. Wherein the transmission includes the external object 1000 transmitting the detection beam entering the inside thereof as the imaging beam 102. The imaging beam 102 carries biometric information of the external object 1000.

It should be noted that the biometric detection described herein includes, but is not limited to, sensing, information collection, feature data comparison, identification result verification, and the like processes of the external object 1000, and the biometric detection for the external object 1000 described herein means that at least the biometric detection can be implemented or is used to help implement the biometric detection.

The backlight module 11 comprises an iron shell 111, a reflector 112, a light guide plate 113, an optical film layer 114, a light source 16 arranged on one side of the light guide plate 113, a rubber frame 115 located on one side of the light source 16 far away from the light guide plate 113, and a light shielding rubber 116 arranged on the rubber frame 115 and the light source 16.

The light source 16 is used for emitting the detection light beam 101 upwards and emitting the backlight light beam 100 sideways. The backlight beam 100 enters the light guide plate 113 from the side of the light source 16, exits from above the light guide plate 113, and enters the display panel 12. The backlight beam 100 is used for providing the display panel 12 to perform image display, and the detection beam 101 can pass through the display panel 12 to reach an external object 1000. The detection beam 101 is used for biometric detection of an external object 1000.

Referring to fig. 4A and 4B, fig. 4A is a partial perspective view of the light source 16. Fig. 4B is a schematic partial cross-sectional view of the light source 16 taken along line C-C of fig. 1. The light source 16 includes a light emitting unit 161 and a backlight circuit board 162. The light emitting unit 161 is, for example, but not limited to, soldered or attached to the backlight circuit board 162. The backlight circuit board 162 includes, but is not limited to, a flexible circuit board or a printed circuit board.

The light emitting unit 161 includes a first light emitting surface 1611 and a second light emitting surface 1612. As shown in fig. 4A and 4B, the first light emitting surface 1611 is located at a side surface of the light emitting unit 161, and the first light emitting surface 1611 is configured to emit the backlight beam 100 to a side of the light emitting unit 161. The second light-emitting surface 1612 is located above the light-emitting unit 161, and the second light-emitting surface 1612 is used for emitting the detection beam 101 to the upper side of the light-emitting unit 161. The second light emitting surface 1612 is closely attached to the lower surface of the backlight circuit board 162.

Optionally, referring to fig. 4C, the second light-emitting surface 1612 of the light-emitting unit 161 includes a solder leg 1613, the light-emitting unit 161 is soldered on the lower surface of the backlight circuit board 162 through the solder leg 1613, and the detection light beam 101 penetrates through the backlight circuit board 162 from the gap between the solder legs 1613.

Optionally, the backlight circuit board 162 includes a conductive circuit and a flexible substrate. In some embodiments, the conductive traces and flexible substrate are capable of transmitting the detection beam 101, such as, but not limited to, the conductive traces and flexible substrate being made of transparent material. Optionally, in some embodiments, the backlight circuit board 162 has an opening corresponding to the second light-emitting surface 1612, and the detection beam 101 passes through the backlight circuit board 162 through the opening. Optionally, in some embodiments, by reasonably arranging a conductive circuit, the conductive circuit is enabled to avoid a position corresponding to the second light emitting surface 1612, and the flexible substrate can transmit the detection light beam 101.

The light guide plate 113 includes a side surface (not numbered) and a top surface (not numbered). The first light emitting surface 1611 faces the side surface of the light guide plate 113, and the backlight beam 100 enters from the side surface of the light guide plate 113 and exits from the top surface of the light guide plate 113; the backlight beam 100 is provided to the display panel 12 above the backlight module 11 for image display, the detection beam 101 can penetrate through the display panel 12 to reach an external object, and the detection beam 101 is used for detecting the biological characteristics of the external object 100. Optionally, the light emitting unit 161 is at least disposed corresponding to a middle portion of a side surface of the light guide plate 113, or the light emitting unit 161 is at least disposed corresponding to two ends of the side surface of the light guide plate 113, or the light emitting unit 161 is disposed corresponding to an entire area of the side surface of the light guide plate 113.

In this embodiment, the height of the first light emitting surface 1611 is greater than the thickness of the light guide plate 113 at the top surface. In order to improve the utilization rate 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 height of the light guide plate 113 is substantially equal to the height of the first light emitting surface 1611. The light guide plate 113 has a slope (not numbered) between the side surface and the top surface, and the slope gradually reduces the thickness of the light guide plate 113. Since the thickness of the display region corresponding to the light guide plate 113 is small, the entire display device 10 can be made thin.

It should be noted that this embodiment is only schematically described, and in other embodiments, the light guide plate 113 and the light source 16 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 a uniform thickness. The embodiment of the utility model provides a do not limit this.

The light guide plate 113 further includes a bottom surface facing the reflective sheet 112, and the bottom surface is disposed in parallel with the top surface of the light guide plate 113. The reflective sheet 112 is used to reflect the backlight beam 100 emitted from the bottom surface of the light guide plate 113 back into the light guide plate 113. The optical film layer 114 serves to diffuse and brighten the backlight beam 100. The backlight beam 100 enters the display panel 12 after passing through the optical film layer 114. The reflective sheet 112, light guide plate 113 and optical film layer 114 are capable of transmitting the imaging light beam 102.

In this embodiment, the optical film layer 114 is disposed on the top surface of the light guide plate 113, and the height of the optical film layer is flush with the light shielding glue 116. The light shielding glue 116 is disposed on the glue frame 115 and the backlight circuit board 162 in a covering manner. The rubber frame 115 is disposed on a side of the light source 16 away from the light guide plate 113, and the rubber frame 115 is disposed on the iron case 111. The glue frame 115 has a blocking effect on the backlight beam 100 and the detection beam 101, and the blocking effect on the light beams includes, but is not limited to, absorption and/or reflection of the light beams. The light blocking glue 116 blocks the backlight beam 100 and transmits the detection beam 101.

The iron shell 111 has an opening 1111, and the detection module 19 is disposed under the backlight module 11 corresponding to the opening 1111 of the iron shell 111. The imaging beam 102 enters the detection module 19 through the opening 1111.

The display panel 12 includes a first substrate 121, a liquid crystal layer 122, and a second substrate 123 sequentially arranged from bottom to top. Illustratively, the first substrate 121 and the second substrate 123 may be glass substrates, plastic substrates, semiconductor substrates, metal substrates, or the like. The display panel 12 is, for example, but not limited to, a liquid crystal display panel.

The first substrate 121 is also referred to as an array substrate, and includes a thin film transistor array formed by a plurality of Thin Film Transistors (TFTs), a plurality of rows of scan lines (gate lines), and a plurality of columns of data lines (data lines). The 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.

The first substrate 121 has a terminal area 1211 extending outward from an edge of the second substrate 123. The terminal portion 1121 is located in a non-display region of the display device 10.

The display panel 12 further includes a panel circuit board 124 partially disposed on the terminal area 1211. The panel circuit board 124 is a flexible circuit board, and is bent outward from the terminal area 1211 to extend below the backlight module 11. Optionally, the panel circuit board 124 is electrically connected to the driving circuit chip of the display panel 12.

In this embodiment, the display panel 12 further includes an integrated circuit 125 located on the terminal area 1211. The integrated circuit 125 is disposed between the panel circuit board 124 and the second substrate 123. A portion of the panel circuit board 124 is connected to an edge portion of the terminal area 1211. The integrated circuits 125 are disposed on the terminal region 1211 through a cog (chip on glass) process. Alternatively, the panel circuit board 124 and the terminal area 1211 are connected by a conductive adhesive, and the integrated circuit 125 and the terminal area 1211 are connected by a conductive adhesive. Such as, but not limited to, anisotropic conductive adhesive ACF.

Alternatively, in some embodiments, the integrated circuit 125 may be disposed on the panel circuit board 124 along the extension portion through a cof (chip on film) process. At this time, the terminal area 1211 may have a smaller width since the integrated circuit 125 does not need to be provided, so that the display device 10 may have a narrower non-display area, for example, the display device 10 may have a narrower frame when viewed from the front.

Please refer to fig. 5, which is a partially enlarged view of the terminal area 1211 shown in fig. 3. The width D1 of the portion of the panel circuit board 124 that connects to the edge of the terminal area 1211 is approximately 1 mm. The width of the integrated circuit 124 is approximately 0.8 mm to 1 mm. The width D3 of the terminal area 1211 between the integrated circuit 125 and the second substrate 123 is approximately 2 mm. The horizontal distance D4 between the edge of protective cover 13 and the edge of terminal area 1211 is, for example, but not limited to, about 3 mm to about 4 mm. The width D5 of the backlight circuit board 162 is approximately 2 mm.

In this embodiment, the detection beam 101 is transmitted through the terminal area 1211 between the integrated circuit 125 and the second substrate 123 to the protective cover 13. Specifically, the light emitting unit 161 emits the detection beam 101 from the second light emitting surface 1612. The detection light beam 101 sequentially passes through the backlight circuit board 162, the light shielding glue 116, the terminal area 1211 and the protective cover 13 to reach the outside or the outer surface of the display device 10. In this embodiment, the detection beam 101 reaches the external object 1000 at the outer surface of the protective cover 13, and the detection beam 101 enters the external object 1000 and undergoes, for example, but not limited to, scattering, and/or refraction, and/or reflection. The external object 1000 transmits the detection beam 101 entering the inside thereof as the imaging beam 102 out of the display area. The imaging light beam 102 sequentially passes through the protective cover 13, the display panel 12 and the backlight module 11 to reach the detection module 19.

In this embodiment, the detection light beam 101 passes through the non-display area of the display device 10 to reach the external object 1000, and is received by the detection module 19 in the display area of the display device 10.

Alternatively, in some embodiments, the detection beam 101 may pass through a display area of the display device 10 to reach the external object 1000.

Optionally, in some embodiments, the imaging light beam 102 may at least partially pass through a non-display area of the display device to reach the detection module 19.

Optionally, in some embodiments, the detection module 19 is at least partially disposed in the non-display area.

Referring to fig. 6, a partial cross-sectional view of a modified embodiment of the biometric sensing system 1 shown in fig. 3 is shown. As shown in fig. 6, in the present embodiment, the detection beam 101 is transmitted and emitted from the connection point of the panel circuit board 124 and the terminal area 1211. Specifically, the light emitting unit 161 emits the detection light beam 101 from the second light emitting surface 1612, and the detection light beam 101 sequentially passes through the backlight circuit board 162, the light shielding glue 116, the terminal area 1211, the panel circuit board 124, and the protective cover 13 to reach the outside or the outer surface of the display device 10.

Optionally, in some embodiments, the backlight circuit board 162 and the light shielding glue 116 have an opening for transmitting the detection light beam 101 or are made of a material capable of transmitting the detection light beam 101.

Optionally, in some embodiments, the backlight circuit board 162 and the panel circuit board 124 have conductive traces and a flexible substrate that transmits the detection beam 101. The detection beam 102 passes through the flexible substrate between the conductive traces and thus through the backlight circuit board 162 and the panel circuit board 124.

Optionally, in some embodiments, the terminal area 1211 has conductive lines and a substrate, and the detection beam 102 is transmitted through the substrate between the conductive lines of the terminal area 1211 and thus through the terminal area 1211. Optionally, in some embodiments, the protective cover 13 is made of a material that can transmit the detection beam 101.

It should be noted that, in other embodiments of the present application, the detection beam 101 may also be transmitted through the integrated circuit 125. The backlight circuit board 162, the light shielding glue 116, the terminal 1211, the panel circuit board 124 and the protective cover 13 may also have different configurations so as to allow the detection light beam 101 to pass through. For example, the terminal area 1211 and the panel circuit board 124 may have openings for the detection beam 101 to pass through. The embodiments of the present application do not limit this.

Please refer to fig. 7, which is a schematic diagram of an alternative embodiment of the light source 16 shown in fig. 3. The light source 26 may be used in place of the light source 16 in the embodiments or variations described herein. The light source 26 includes a backlight circuit board 262, a first light emitting unit 263, and a second light emitting unit 264. The first and second

light emitting units

263 and 264 are disposed on a lower surface of the backlight circuit board 262. The first light emitting unit 263 includes a first light emitting surface 2611 located on a side surface thereof, and the first light emitting surface 2611 is used for emitting the backlight beam 100 to a side direction. The second light emitting unit 264 includes a second light emitting surface 2612 on the top surface thereof, and the second light emitting surface 2612 is used for emitting the detection light beam 101 upwards.

In some embodiments, the first light emitting unit 263 and the second light emitting unit 264 are arranged in a column, and the second light emitting unit 264 is located at least at a middle position of the column. Optionally, the first light-emitting units 263 and the second light-emitting units 264 are sequentially and alternately arranged, and/or the first light-emitting units 263 and the second light-emitting units 264 are at least partially continuously arranged. The first light emitting unit 263 is configured to emit the backlight beam 100, the second light emitting unit 264 is configured to emit the detection beam 101, the first light emitting unit 263 includes a first light emitting surface facing the light guide plate, the second light emitting unit 264 includes a second light emitting surface 2612 facing upward, the first light emitting surface 2611 is configured to emit the backlight beam 100, the second light emitting surface 2612 is configured to emit the detection beam 101, the backlight circuit board 262 has an opening corresponding to the second light emitting surface 2612, or is made of a material capable of transmitting the detection beam and blocking the backlight beam 100, or the detection beam 101 penetrates through a gap between wire lines of the backlight circuit board 262 so as to penetrate through the backlight circuit board 262.

In this embodiment, the backlight beam 200 is visible light, such as white light. The detection beam 201 and the imaging beam 202 are invisible light, and the invisible light includes near infrared light. The detection beam 201 and the imaging beam 202 are for example near infrared beams.

Illustratively, the visible light includes a beam having a wavelength in the range of 400 to 700nm (nanometers). The near infrared light includes a light beam having a wavelength range of 800-1000 nm. The detection beam 201 and the imaging beam 202 are, for example, beams having a wavelength of 850nm or 940 nm.

Referring to fig. 8, in an embodiment of the present invention, the biometric characteristic detection system 3 includes a display device 30 and a detection module 39 disposed below the display device 30. The detection module 39 is capable of receiving an imaging light beam 302 from the external object 1000 through the display device 30, and the imaging light beam 302 can be used for biometric detection of the external object 1000.

The display device 30 comprises a backlight module 31, a display panel 32 and a protective cover plate 33 which are sequentially arranged from bottom to top. The backlight module 31 includes a reflector 312, a light guide plate 313 and an optical film layer 314 from bottom to top. The backlight module 31 further includes a light source 36 disposed at one side of the light guide plate 313. Fig. 9A and 9B are schematic views of the light source 36 shown in fig. 8. Fig. 9B is a schematic cross-sectional view from left to right in fig. 8.

The illustrated light source 36 includes a first light emitting unit 363, a second light emitting unit 364, and a backlight circuit board 362. The backlight circuit board 362 has a zigzag structure. The backlight circuit board 362 includes an elongated main body portion (not numbered) and an extension portion (not numbered) extending from the middle of the main body portion and protruding therefrom. The first light emitting unit 363 is disposed below the main body portion, and the second light emitting unit 364 is disposed above the extension portion. The extension portion extends in a direction away from the light guide plate 313.

The first light emitting unit 363 includes an upper surface (not numbered) and a first light emitting surface 3611 connected to each other, and the upper surface of the first light emitting unit 363 is connected to the lower surface of the main body of the backlight circuit board 362. The first light emitting unit 363 is configured to emit a backlight beam 100 to a lateral space thereof, and the backlight beam 100 is emitted from the first light emitting surface 3611.

The second light emitting unit 364 includes a lower surface (not numbered) and a second light emitting surface 3612 opposite to each other. The lower surface of the second light emitting unit 364 is connected to the upper surface of the extension portion of the backlight circuit board 362. The second light emitting unit 364 is configured to emit a detection light beam 301 to an upper space thereof, and the detection light beam 301 exits from the second light exiting surface 3612.

The backlight circuit board 362 may be a flexible circuit board including conductive traces and a flexible substrate. The flexible substrate is capable of transmitting the detection beam 301. The detection beam 301 can penetrate through the flexible substrate between the conductive traces and thus through the backlight circuit board.

The light guide plate 313 includes a side surface (not numbered) and a top surface (not numbered). The first light emitting surface 3611 faces the side surface of the light guide plate 313, and the backlight beam 300 enters from the side surface of the light guide plate 313 and exits from the top surface of the light guide plate 313. The backlight beam 300 is provided to the display panel 32 above the backlight module 31 for image display. The detection light beam 301 is capable of passing through the display panel 32 to the external object 1000, and the detection light beam 301 is used for biometric detection of the external object 1000.

Optionally, in some embodiments, the first light emitting units 363 are equally spaced, and the second light emitting units 364 are equally spaced. The first light emitting units 363 are aligned in a direction parallel to a side surface of the light guide plate 313, and the second light emitting units 364 are aligned in a direction parallel to a side surface of the light guide plate 313.

Optionally, in some embodiments, the first light emitting surface 3611 is perpendicular to the lower surface of the backlight circuit board 362, the second light emitting surface 3612 is parallel to the upper surface of the backlight circuit board 362, and the upper surface and the lower surface of the backlight circuit board 362 are arranged in parallel.

It should be noted that, in other or modified embodiments of the present application, the light sources 36 may have different structures and arrangements, for example, the backlight circuit board 362 may have a rectangular, parallelogram, polygonal, etc. structure; alternatively, the first light emitting unit 363 may be located on an upper surface of the backlight circuit board 362; alternatively, the second light emitting unit 364 may be located on a lower surface of the backlight circuit board 362, or the like. The embodiments of the present application do not limit this.

It should be noted that, the present embodiment schematically illustrates the number of the first light-emitting units 363 and the second light-emitting units 364, but the number of the first light-emitting units 363 and the second light-emitting units 364 is not limited in the present application. In other embodiments, the number of the first light emitting unit 363 and the second light emitting unit 364 may be one or more, which is not limited in this embodiment of the application.

The backlight module 31 further includes a light shielding glue 316 disposed on the backlight circuit board 362 and the second light emitting unit 364. The light blocking glue 316 blocks the backlight beam 300 and transmits the detection beam 301, or the light blocking glue 316 has an opening corresponding to a light emitting surface of the second light emitting unit. The light shielding glue 316 is closely attached to the upper surface of the backlight circuit board 362 and the upper surface of the second light emitting unit 364.

The light guide plate 313 includes a bottom surface facing the reflective sheet 312, the bottom surface and the top surface are arranged in parallel, and the reflective sheet 312 is used for reflecting the backlight beam 300 emitted from the bottom surface of the light guide plate 313 back into the light guide plate 313. The optical film layer 314 serves to diffuse and brighten the backlight beam. Illustratively, the optical film layer 314 includes a diffuser film (diffuser film) for diffusing the backlight beam 100 and a brightness enhancement film (brightness enhancement film) for enhancing the backlight beam 100.

The backlight beam 100 enters the display panel 32 after passing through the optical film layer 314. In addition, the reflective sheet 312, the light guide plate 313 and the optical film layer 314 can transmit the image beam 302.

Optionally, in some embodiments, the backlight module 31 further includes an iron shell (not shown) located below the reflective sheet 312, the iron shell is used for supporting and protecting optical components of the backlight module 31, and the iron shell has an opening through which the imaging light beam 302 reflected or transmitted by the external object 1000 can be received by the detection module 39. The detection module 39 is disposed under the backlight module 31 opposite to the opening.

The display panel 32 includes a panel layer 329. The panel layer 329 has terminal regions 3211 extending outward along the bottom surface edges. The display panel 32 further includes a panel circuit board 324, the panel circuit board 324 is a flexible circuit board, and a portion of the panel circuit board 324 is connected to an edge portion of the terminal region 3211 and is bent outward to extend to a position below the backlight module 31.

In this embodiment, the second light emitting unit 364 is located at a side of the terminal area 3211, and the second light emitting unit 364 is located in a space formed by the protective cover 33, the panel circuit board 324, and the backlight circuit board 362. Optionally, in some embodiments, the second light emitting unit 364 may be at least partially located below the terminal area 3211.

The display panel 32 further includes an integrated circuit 325 disposed on the terminal area 3211. The integrated circuit 325 is located on the terminal area 3211 between the panel circuit board 324 and the panel layer 329. The integrated circuit 325 may be a driving circuit chip for touch control of the panel layer 329. The integrated circuit 325 is disposed on the terminal region 3211 through a COG process.

Alternatively, in some embodiments, the integrated circuit 325 may be disposed on the panel circuit board 324 along the extension portion through a cof (chip on film) process. At this time, the terminal area 3211 may have a smaller width because the integrated circuit 325 is not required to be disposed.

Illustratively, the panel layer 329 includes two substrates disposed opposite to each other and a liquid crystal layer interposed between the two substrates. Optionally, the panel layer 329 may be another non-self-luminous display panel or a luminous display panel, which is not limited in this embodiment.

Compared with the prior art, the light source 36 includes a first light emitting unit 363 and a second light emitting unit 364, and the first light emitting unit 363 is used for emitting the backlight beam 300 to meet the image display requirement of the display device 30. The second light emitting unit 364 emits the detection light beam 301 and transmits the display device 30 to the external object 1000, so as to satisfy the detection light beam requirement for the detection of the under-screen biological forehead. Moreover, since the second light emitting unit 364 and the first light emitting unit 363 are both disposed on the backlight circuit board 362, the second light emitting unit 364 fully utilizes the existing space of the non-display area of the display panel 32 and the backlight module 31 of the display device 30, and does not increase the size of the non-real area of the display device 30. The technical scheme of the application can also meet the requirement of further reducing the non-display area. The display device 30 can have a high screen ratio, and a user can obtain a good visual feeling without opening the display panel 32 and the protective cover 33. Therefore, the utility model discloses biological feature detecting system 3 has and can better realize that biological feature detects under the screen, and it accounts for 30 to show to have higher screen to account for and pleasing to the eye visual effect.

Referring to fig. 10, in an embodiment of the present application, the biometric detection system 4 includes a display device 40 and a detection module 49 disposed below the display device 40. The detection module 49 is capable of receiving an imaging beam 402 from the external object 1000 through the display device 40, wherein the imaging beam 402 is capable of being used for biometric detection of the external object 1000. Including, but not limited to, the detection module 49 converting the received imaging beam 402 into image data with corresponding biometric information and generating a corresponding biometric image. The image data may be visible light image data (e.g., RGB color image data) or invisible light image data (e.g., infrared light or near infrared light image data). Alternatively, the detection beam 401 and the imaging beam 402 may be visible light or invisible light. The invisible light includes near-infrared light or infrared light.

The biometric information includes, but is not limited to, fingerprint, iris, face, palm print, capillary, heart rate, pulse, body temperature, etc. The biometric detection system 4 can be used for image generation, liveness detection, authentication, as a medical instrument aid, and the like of the external object 1000 by detecting and recognizing biometric information of the external object 1000.

In addition, the biometric detection system 4 may further obtain two-dimensional information and/or depth information of the external object 1000 by using an optical detection principle and method such as structured light (structured light) or time of flight (time of flight), so as to obtain two-dimensional and/or three-dimensional biometric information, two-dimensional and/or three-dimensional coordinate information, and two-dimensional and/or three-dimensional image information of the external object 1000.

Optionally, the detecting module 49 includes, for example but not limited to, a light sensor or a light detector, and a lens or a small lens disposed on the light sensor.

The display device 40 comprises a backlight module 41, a display panel 42 and a protective cover plate 43 which are arranged in sequence from bottom to top. The display panel 42 is used for displaying images and can provide a contact-type or non-contact-type human-computer interaction interface for a user. The backlight module 11 is configured to provide a backlight beam required for image display for the display panel 42, and emit a detection beam 401 to the external object 1000. The detection beam 401 can be used for biometric detection of the external object 1000. The imaging beam 402 includes, but is not limited to: the detection beam 401 reflected by the external object 1000 and/or the detection beam 401 transmitted by the external object 1000. Wherein the transmitting includes the external object transmitting the detection beam entering the internal portion thereof as the imaging beam 402.

The backlight module 41 includes a reflector 412, a light guide plate 413 and an optical film layer 414 sequentially from bottom to top. The backlight module 41 further includes a light source 46 disposed at one side of the light guide plate 413.

The light source 46 may have the same structure as the

light sources

16, 26, 36 or their modified embodiments in the above embodiments. The reflective sheet 412 may have the same structure as the

reflective sheets

112 and 312 or the modified embodiments thereof in the above embodiments. The light guide plate 413 may have the same structure as the

light guide plates

113 and 313 of the above-described embodiments or modified embodiments thereof. The optical film layer 414 may have the same structure as the optical film layers 114, 314 or modified embodiments thereof in the above embodiments.

The light source 46 includes a light emitting unit 461 and a backlight circuit board 462. The light emitting unit 461 is soldered or attached to the backlight circuit board 462. The backlight circuit board 462 includes, but is not limited to, a flexible circuit board or a printed circuit board.

The light emitting unit 461 includes a first light emitting surface (not numbered) and a second light emitting surface (not numbered). The first light emitting surface is located at a side surface of the light emitting unit, and the first light emitting surface is configured to emit the backlight beam 400 to a side of the light emitting unit 461. The second light emitting surface is located above the light emitting unit 461, and the second light emitting surface is used for emitting the detection light beam 401 to the upper side of the light emitting unit 461. The second light emitting surface is closely attached to the lower surface of the backlight circuit board 462.

The light guide plate 413 includes a side surface (not numbered) and a top surface (not numbered). The first light emitting surface faces the side surface of the light guide plate 413, and the backlight beam 400 enters from the side surface of the light guide plate 413 and exits from the top surface of the light guide plate 413. The backlight beam 400 is provided to the display panel 42 above the backlight module for image display, the detection beam 401 can penetrate through the display panel 42 to reach an external object, and the detection beam 401 is used for biological feature detection of the external object 100. The side surface is a light incident surface of the light guide plate 413, and the top surface is a light emitting surface of the light guide plate 413.

The backlight module 41 further includes a light shielding adhesive 416 disposed on the backlight circuit board 462. The light blocking glue 416 can block the backlight beam 400 and transmit the detection beam 401, or the light blocking glue 416 has an opening corresponding to the light emitting surface of the second light emitting unit. The light shielding glue 416 is attached to the upper surface of the backlight circuit board 462.

Optionally, in some embodiments, the light blocking glue 416 blocks the backlight beam 400 or other visible light. A partial region of the light shielding glue 416 facing the light emitting unit 461 can transmit the detection light beam 401, and other regions of the light shielding glue 416 block the detection light beam 401. By providing a light-transmitting area on the light-shielding glue 416, through which part of the detection light beam 401 can be transmitted, and adjusting the range of the light-transmitting area, the exit angle of the detection light beam 401 after penetrating through the light-shielding glue 416 can be controlled.

The display panel 42 includes a lower polarizer 424, a first substrate 421, a liquid crystal layer 422, a second substrate 423, and an upper polarizer 425, which are sequentially disposed from bottom to top. The first substrate 421 is also referred to as an array substrate, and the second substrate 423 is also referred to as a color filter substrate. The first substrate 421 has a terminal area 4211 protruding outward along one side edge of the second substrate 423. The terminal area 4211 corresponds to a non-display area of the display device 40. The second substrate 423, the liquid crystal layer 422, the upper polarizer 425, and the lower polarizer 424 are disposed substantially corresponding to the display region of the display device 40.

The display panel 42 further includes a panel circuit board 424 partially connected to the terminal area 4211, and the panel circuit board 424 is bent outward and extends to below the backlight module 41.

The display panel 42 also includes an integrated circuit 425 disposed on the terminal area 4211 adjacent to the panel circuit board 424. The integrated circuit 425 is disposed on the terminal areas 4211 through a COG process. The integrated circuit 425 is, for example, but not limited to, a touch detection driver circuit chip.

Optionally, the terminal areas 4211 comprise conductive traces. After passing through the light shielding glue 416, the detection light beam 401 passes through the terminal area 4211 through the gap between the conductive traces of the terminal area 4211, and can further pass through the protective cover 43 to reach the external object 1000.

Optionally, the panel circuit board 424 includes conductive traces and a flexible substrate, and after the light shielding glue 416 and the terminal area 4211 are transmitted, the detection light beam 401 can pass through the panel circuit board 424 through a gap between the conductive traces of the panel circuit board 424.

Since the detection light beam 401 needs to pass through a plurality of backlight modules 41 and film layers of the display panel 42 during the process from the light source 46 to the external object 1000, for example, but not limited to, when the detection light beam 401 passes through the terminal area 4211, part of the detection light beam 401 may be reflected at the terminal area 4211. When the detection beam 401 is transmitted through the panel circuit board 424, part of the detection beam 401 may be reflected at the panel circuit board 424. When the detection beam 401 is transmitted through the protective cover 43, part of the detection beam 401 may be reflected by the protective cover 43. The detection beam 401 may also enter the display area of the display device 40 and may thus be reflected at the upper polarizer 425.

The reflected beam of the detection beam 401 formed in the above various reflection situations may be referred to as a reflected interference beam of the detection beam 401. May be received by the detection module 49 via the display panel 42 and/or the backlight module 41.

Therefore, in order to prevent the reflected interference light beam of the detection light beam 401 from being received by the detection module 49 after part of the detection light beam 401 is reflected by the terminal area 4211 when passing through the terminal area 4211, the backlight module 41 may further include a light blocking diaphragm 418. The photoresist diaphragm 418 is disposed on the light blocking paste 416. The light-blocking diaphragm 418 is used to absorb the detection beam 401.

The light-blocking membrane 418 is located below the display panel 42. Optionally, the photoresist diaphragm 418 is located below the first substrate 421 and below the lower polarizer 424. Optionally, the photo-resist diaphragm 418 is disposed under the terminal area 4211 opposite to the terminal area 4211, and the photo-resist diaphragm 418 is disposed in parallel with the lower polarizer 424. Optionally, the photo-resistive membrane 418 is at least partially disposed directly below the terminal areas 4211 opposite the terminal areas 4211.

Optionally, in some embodiments, the light-blocking membrane 418 is at least partially located in the display area of the display device 40.

Optionally, in some embodiments, the photoresist membrane 418 covers at least a portion of the top surface of the light guide plate 413.

Optionally, in some embodiments, the photoresist diaphragm 418 covers at least a portion of the light blocking glue 416.

Optionally, in some embodiments, the light-blocking membrane 418 absorbs the detection beam and transmits the backlight beam 400.

Optionally, in some embodiments, the light-blocking diaphragm 418 reflects the detection beam and transmits the backlight beam 400.

Referring to fig. 11, in a modified embodiment of the biometric sensing system 4, the light-blocking film 418 covers the top surface of the light guide plate 413, or the light-blocking film 418 is disposed corresponding to the display area of the display device 40. The photoresist diaphragm 418 has an opening 4181, and the angle of view of the opening 4181 is consistent with the range of the field area formed on the top surface of the light guide plate 413 by the imaging light beam 402 received by the detection module 49. The field of view region is a region surrounded by a field angle with the detection module 49 as a vertex on the top surface of the light guide plate 413 or a field of view region of the detection module 49 on the top surface of the light guide plate 413.

The imaging beam 402 can reach the detection module 49 through the opening 4181, and the reflected interference beam of the detection beam 401 is absorbed or reflected by the photoresist diaphragm 418, so that the photoresist diaphragm 418 effectively reduces or eliminates the adverse effect of the reflected interference beam of the detection beam 401 on the optical imaging performed by the detection module 49 receiving the imaging beam 402.

Referring to fig. 12, in a modified embodiment of the biometric detection system 4, the display panel 42 further includes an anti-reflection film 429 disposed below the terminal area 4211. The anti-reflective film 429 is configured to transmit the detection beam 401. The detection beam 401 is substantially free from reflection when it passes through the anti-reflective film 429, thereby effectively reducing the reflected interference beam of the detection beam 401. Further alternatively, the anti-reflection film 429 may be disposed above the light shielding glue 416, which may be regarded as a part of the backlight module 41.

Alternatively, the display device 40 may include both the photoresist diaphragm 418 and the anti-reflection film 429, or only one of them. The photoresist diaphragm 418 and the anti-reflection film 429 may have other configurations, such as being disposed below the lower polarizer 424, and other embodiments may have different configurations, which is not limited in this application.

In the above embodiments, the backlight beam 400 is visible light, such as but not limited to visible light of 400-700 nm. The detection light beam 401 and the imaging light beam 402 are near-infrared light beams, such as, but not limited to, near-infrared light of 800-1000 nm.

Compared with the prior art, the biometric feature detection device 4 comprises the light source 46, and the light source 46 can emit the backlight beam 400 to the side, so that the image display requirement of the display panel 41 is met. Meanwhile, the light source 46 can emit a detection light beam 401 upwards, and the detection light beam 401 is transmitted through the backlight module 41 and the display module 40 to reach the external object 1000. The imaging light beam 402 reflected or transmitted by the external object 1000 is received by the detection module 49, thereby enabling the detection of the off-screen biometric characteristic of the external object 1000. The display device 40 does not need to open a hole in the display panel 42 or the protective cover 43, or additionally provide a detection area for biometric detection in the display area. The biological feature detection device 4 realizes the biological feature detection under the screen without influencing the image display. Moreover, since the biometric detection device 4 does not need to provide an additional infrared light source or other light source for emitting a detection light beam, the space inside the display device 40 is saved. Compared with the prior art, the biometric feature detection device 4 can reduce the size of the non-display area of the display device 40, so that the display device 40 has a narrower frame, a higher screen occupation ratio and a better visual effect.

In some embodiments, the detection module 49 or the display device 40 may further include a processor and a memory (not shown), and the processor may obtain two-dimensional information and/or depth information of the external object 1000 according to the imaging light beam 402 received by the detection module 49.

Further, the memory may also store the biometric information data in advance, and the processor may be configured to 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, such as 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, the detection light beam 501 may include one or more of flood light (flood light, light beam that the illumination area of flood light finger is wider and the illumination angle diverges), speckle structured light, coded structured light, and modulated pulse signal.

The detection module 49 receives the imaging light beam 402 emitted or reflected by the external object 1000 and obtains biometric information or 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 and the like.

In the above embodiment or other embodiments, the areas/locations where the external object 1000 emits the imaging beam 402 and receives the detection beam 401 may be different or the same.

The detection module 49 receives the imaging light beam 402, which can be used for two-dimensional and/or three-dimensional biometric detection of the external object 1000, or two-dimensional and/or three-dimensional image rendering of the external object 1000, or two-dimensional and/or three-dimensional spatial coordinate detection of the external object 1000.

In the above-described embodiment or modified embodiment, the external object 1000 may be a finger, and the biometric detection system 1 may be capable of fingerprint detection and recognition. However, the utility model discloses be not limited to external object 1000, in some other change embodiments, external object 1000 can also be face, palm, iris, blood vessel etc., biological feature detecting system 1 can also be used for detecting external object 1000's facial feature, iris feature, palm print, rhythm of the heart, body temperature etc..

By detecting and identifying the biological characteristics of the external object 1000, the biological characteristic detection system 1 can be used for locking or unlocking a device, verifying online payment services, verifying the identity of a financial system or a public security system, verifying the passage of an access control system and other various products and application scenarios.

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

The biometric detection system 1 can also be applied to application scenarios involving direction, distance, speed, etc. by detecting the spatial coordinates of the external object 1000.

Thus, the biometric detection system 1 can be used for biometric detection and recognition of external objects in two and/or three dimensions, or for image rendering of external objects in two and/or three dimensions, or for spatial coordinate detection of external objects in two and/or three dimensions. In the embodiments and modifications of the present invention, the external object 1000 includes, but is not limited to, a finger, a fingerprint, an eye, an iris, a subcutaneous blood vessel, a face, etc.

The biological feature detection system 1 may be a mobile phone, a tablet computer, a smart watch, an augmented reality/virtual reality device, a human body motion detection device, an auto-drive automobile, smart home equipment, security equipment, an intelligent robot or a component thereof.

In the present application, the first light emitting surface, the second light emitting surface, and the like may be physically present surfaces or imaginary surfaces. The first light emitting surface and the second light emitting surface do not need to exist actually, and all should be regarded as belonging to the creation scope of the present application.

The light source 46 may include a light emitting unit for emitting a light beam, such as, but not limited to, one or more of an LED (light emitting diode), an LD (laser diode), a VCSEL (vertical cavity surface emitting glaser), a Mini-LED, a Micro-LED, or a light emitting array of one or more of an LED, an LD, a VCSEL, a Mini-LED, a Micro-LED.

The above embodiments and the modified embodiments of the present application describe different situations of biometric feature detection systems, and structures of backlight modules, display panels, and the like. Those skilled in the art can understand, make display device have higher screen to account for than in order to realize under the screen when biological characteristic detects, can be with the luminescence unit that is used for launching detection light beam and the luminescence unit integration that is used for launching light beam in a poor light in one encapsulation, perhaps utilize display device inner space to set up different luminescence units for display device can realize better under the screen biological characteristic detection effect, has higher screen to account for than and visual effect simultaneously, will the embodiment or the change embodiment of the utility model carry out changes settings such as split, combination, deformation, scale, limited time test, all belong to the utility model discloses the protection scope.

It should be noted that the structure, function, principle and arrangement of the light source (16, 26, 36, 46), the backlight module (11, 31, 41), the display panel (11, 31, 41), the terminal area (1211, 3211, 4211), the light shielding glue (116, 316, 416), the light shielding diaphragm 418, the anti-reflection film 429 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 in the present invention, and thus the embodiments and their replacement, deformation, combination, separation, extension and the like obtained therefrom all belong to the protection scope of the present invention.

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

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

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

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

Claims

1. The utility model provides a backlight unit, its biological feature detection under can being applied to the screen, its characterized in that, include the light guide plate and be located the light source of light guide plate side, the light source includes luminescence unit, luminescence unit has the first play plain noodles of first normal direction and has the second play plain noodles of second normal direction, preset angle has between first normal direction and the second normal direction, first play plain noodles is used for the outgoing backlight beam, the second is gone out the plain noodles and is used for outgoing detection beam, backlight beam passes through the light guide plate provides a display panel and is used for image display, detection beam can see through display device reachs external object, detection beam is used for detecting external object's biological feature information.

2. The backlight module as claimed in claim 1, wherein the light guide plate includes a top surface and a side surface, the first light-emitting surface faces the side surface, the side surface is a light-incident surface of the light guide plate, the top surface is a light-emitting surface of the light guide plate, the light-emitting unit emits a backlight beam from the first light-emitting surface to a side, the backlight beam enters the light guide plate from the side surface and exits from the top surface, and the backlight beam is provided to the display panel for image display.

3. The backlight module according to claim 2, wherein the display panel has a display area and a non-display area around the display area, the display area is used for displaying images, the non-display area is not used for displaying images, the light emitting unit emits a detection beam upward from the second light emitting surface, and the detection beam transmits through the display panel from the non-display area.

4. The backlight module as claimed in claim 1, wherein the predetermined angle is 90 degrees, acute angle or obtuse angle.

5. The backlight module according to claim 1, wherein a detection module located below the backlight module is capable of receiving an imaging beam through the backlight module, the imaging beam comprising: the detection light beam reflected by the external object and/or the detection light beam transmitted by the external object, wherein the transmission refers to that the external object transmits the detection light beam entering the external object as an imaging light beam, at least one part of the detection module is positioned in the display area of the display panel, and the detection module at least receives the imaging light beam from the display area.

6. The backlight module according to claim 5, further comprising a reflective sheet disposed under the light guide plate, wherein the light guide plate comprises a bottom surface facing the reflective sheet, the bottom surface and the top surface being disposed opposite to each other, and the reflective sheet is configured to reflect the backlight beam emitted from the bottom surface of the light guide plate back into the light guide plate; the reflective sheet is capable of transmitting the imaging light beam.

7. The backlight module according to claim 5, further comprising an optical film layer disposed over the light guide plate for diffusing and/or brightening the backlight beam; the backlight beam enters the display panel after penetrating through the optical film, the optical film layer comprises a diffusion film and/or a brightness enhancement film, and the number of the diffusion film and/or the brightness enhancement film is one or more.

8. The backlight module according to claim 7, further comprising an iron case under the reflector plate for supporting and protecting other components of the backlight module, wherein the iron case has an opening through which the detection beam reflected or transmitted by an external object can be received by a detection module, and the detection module is disposed under the iron case opposite to the opening.

9. The backlight module as claimed in claim 2, wherein the number of the light emitting units is one or more, and the first light emitting surface of the light emitting unit is disposed opposite to the side surface of the light guide plate.

10. A backlight module according to claim 9, wherein the light emitting units are disposed at least corresponding to a middle portion of the side surface, or the light emitting units are disposed at least corresponding to two ends of the side surface, or the light emitting units are disposed corresponding to the whole area of the side surface.

11. The backlight module according to claim 1, wherein the light source further comprises a backlight circuit board, the light emitting unit is located below the backlight circuit board, the backlight module further comprises a rubber frame, the rubber frame is located on a side of the light source away from the light guide plate, the backlight circuit board is partially located on the rubber frame and partially located on the light guide plate, and a light shielding adhesive is disposed above the backlight circuit board, the rubber frame and the light guide plate, wherein: at least partial area of the light shading glue can transmit the detection light beam, and the light shading glue blocks the backlight light beam and other wavelength light beams; or the light shielding glue is provided with an opening through which the detection light beam penetrates.

12. The backlight module as claimed in claim 1, wherein the light source further comprises a backlight circuit board, the light emitting unit is located above the backlight circuit board, the light emitting unit further has a bottom surface opposite to the second light emitting surface, and the bottom surface of the light emitting unit is closely attached to the upper surface of the backlight circuit board.

13. A backlight module according to claim 1, wherein the first normal direction is parallel to a horizontal direction, the second normal direction is perpendicular to the first normal direction, or an acute angle or an obtuse angle is formed between the second normal direction and the first normal direction.

14. A backlight module according to any one of claims 1-13, wherein the light-emitting unit comprises a first light-emitting element and a second light-emitting element integrated in one package, the first light-emitting element being configured to emit the backlight beam and the second light-emitting element being configured to emit the detection beam.

15. The backlight module according to claim 14, wherein the backlight beam is visible light, the detection beam is invisible light, and the invisible light comprises near infrared light.

16. A display device comprising the backlight module of any one of claims 1 to 15.

17. The display device according to claim 16, further comprising a display panel disposed above the backlight module, wherein the display panel has a terminal region extending to an outer portion along a bottom edge, the terminal region is located in a non-display region of the display panel, a light source of the backlight module is located below the terminal region, a detection light beam emitted from the light source can pass through the terminal region, and the terminal region has an opening for passing the detection light beam or can transmit the detection light beam.

18. The display device of claim 17, wherein the display panel further comprises an anti-reflective film disposed under the terminal area, the anti-reflective film configured to prevent reflection of the detection beam.

19. The display device according to claim 17, wherein the display panel further comprises a panel circuit board, the panel circuit board is partially connected to the terminal area and is bent outward to extend below the backlight module, and the detection beam can penetrate through the terminal area and the panel circuit board, wherein: the panel circuit board is provided with an opening for transmitting the detection light beam; or the panel circuit board is made of a material capable of transmitting the detection beam; or the panel circuit board comprises a conductive circuit and a flexible substrate, the flexible substrate transmits the detection light beam, and the detection light beam penetrates through the flexible substrate from the gap of the conductive circuit so as to penetrate through the panel circuit board.

20. The display device according to claim 19, wherein the display panel further comprises a first substrate, a liquid crystal layer and a second substrate arranged from bottom to top, the first substrate is a terminal area, a protruding portion of the first substrate extends outwards relative to an edge of the second substrate, and the display panel further comprises an integrated circuit, the integrated circuit is located on the terminal area or the integrated circuit is located on a bent extending portion of the panel circuit board; when the integrated circuit is arranged on the terminal area, the detection light beam penetrates through the terminal area between the integrated circuit and the second substrate and is emitted outwards, or/and the detection light beam penetrates through the terminal area connected with the panel circuit board and is emitted outwards.

21. The display device according to claim 17, wherein the display panel comprises a lower polarizer, a first substrate, a liquid crystal layer, a second substrate and an upper polarizer, which are sequentially disposed from bottom to top, the portion of the first substrate protruding from the edge of the second substrate is the terminal area, the backlight module further comprises a light blocking film, and the light blocking film is partially located in the non-display area and/or partially located in the display area of the display device, and the light blocking film is located below the display panel.

22. The display device according to claim 21, wherein a detection module is capable of transmitting light to receive the imaging light beam reflected and/or transmitted by an external object through the display device, the detection module has a viewing angle for receiving the imaging light beam, the light guide plate has a viewing field area corresponding to the viewing angle, the viewing field area is an area surrounded by the viewing angle with the detection module as a vertex on a top surface of the light guide plate, and the light blocking film covers a portion of the top surface of the light guide plate outside the viewing field area.

23. The display device according to claim 17, further comprising a protective cover plate over the display panel, the protective cover plate covering the terminal area, the detection beam being transparent to the protective cover plate, the protective cover plate being made of a transparent material, the transparent material comprising transparent glass or transparent sapphire.

24. A biometric detection system, comprising the backlight module of claims 1-15 or the display device of claims 16-23.