CN111708226A - Backlight module and display device - Google Patents

Backlight module and display device Download PDF

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Publication number
CN111708226A
CN111708226A CN202010624272.4A CN202010624272A CN111708226A CN 111708226 A CN111708226 A CN 111708226A CN 202010624272 A CN202010624272 A CN 202010624272A CN 111708226 A CN111708226 A CN 111708226A
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CN
China
Prior art keywords
light
backlight module
guide plate
circuit board
light guide
Prior art date
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Granted
Application number
CN202010624272.4A
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Chinese (zh)
Other versions
CN111708226B (en
Inventor
洪金龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xiamen Tianma Microelectronics Co Ltd
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Xiamen Tianma Microelectronics Co Ltd
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Priority to CN202010624272.4A priority Critical patent/CN111708226B/en
Publication of CN111708226A publication Critical patent/CN111708226A/en
Application granted granted Critical
Publication of CN111708226B publication Critical patent/CN111708226B/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133608—Direct backlight including particular frames or supporting means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/145—Illumination specially adapted for pattern recognition, e.g. using gratings
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/147—Details of sensors, e.g. sensor lenses
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing

Abstract

The embodiment of the invention discloses a backlight module and a display device, wherein the backlight module comprises: a light guide plate; a backlight source; the light emitting surface of the backlight source is opposite to the light incident surface of the light guide plate; a rubber frame; the rubber frame fixedly accommodates the light guide plate and the backlight source; the top of at least one side edge of the rubber frame comprises a bearing surface; the bearing surface is provided with at least one group of groove structures, and each group of groove structures comprises at least one groove; at least one bearing support which is arranged corresponding to at least one group of groove structures one to one; at least one infrared light-emitting element is arranged in the bearing support, and the light-emitting surface of the infrared light-emitting element is intersected with the light-emitting surface of the light guide plate; the bottom of the bearing bracket is provided with at least one bulge; the protrusion is clamped with the groove. The embodiment of the invention solves the problem of poor fingerprint identification effect caused by the arrangement position of the infrared light source in the existing fingerprint identification display device, not only can ensure the infrared light intensity, but also can improve the sensitivity of fingerprint identification; the length of the cover glass is reduced, and the narrow frame is realized.

Description

Backlight module and display device
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
With the development of display technology, electronic products (including display panels and display devices) having a display function generally integrate a fingerprint recognition function.
The existing fingerprint identification technology can be divided into capacitive fingerprint identification and optical fingerprint identification according to a fingerprint identification principle, and the optical fingerprint identification can be divided into direct type fingerprint identification and side type fingerprint identification according to the angle of a light incident to a photosensitive surface of a fingerprint identification sensor. The side-entering type fingerprint identification means that the infrared light emitting diode is arranged in a frame area of the display screen, infrared light rays are obliquely emitted to the fingerprint identification area through the infrared light emitting diode, and after the infrared light rays are reflected by the fingerprint of the fingerprint identification area, infrared light signals reflected by the fingerprint are collected by the fingerprint sensor, so that the identification of the fingerprint is realized.
Fig. 1 is a schematic structural diagram of a conventional side-entry fingerprint identification display device, and referring to fig. 1, specifically, an infrared light emitting diode 1 is generally disposed right below a frame region of a cover glass 2, and is covered and protected by the cover glass 2. Meanwhile, the step area of the display panel needs to be provided with the flexible circuit board 3, and the flexible circuit board 3 is bent to the back of the display panel in the frame area so as to be connected with the driving main board. It can be seen that the infrared light emitting diode 1 needs to be disposed at the outer region of the flexible circuit board 3, and therefore the length of the cover glass 2 needs to be increased appropriately; in addition, the distance from the infrared light emitting diode 1 to the fingerprint identification area is long, loss is easily generated in the infrared light transmission process, and in addition, partial infrared light emitted by the infrared light emitting diode 1 can be blocked by the flexible circuit board 3, so that the fingerprint identification effect is poor.
Disclosure of Invention
The invention provides a backlight module and a display device, which are used for shortening the distance between a fingerprint identification light-emitting element and a fingerprint identification area, avoiding a flexible circuit board from blocking infrared rays, reducing the length of cover plate glass and being beneficial to realizing a narrow frame.
In a first aspect, an embodiment of the present invention provides a backlight module, including:
a light guide plate;
a backlight source; the light emitting surface of the backlight source is opposite to the light incident surface of the light guide plate;
a rubber frame; the rubber frame fixedly accommodates the light guide plate and the backlight source; the top of at least one side edge of the rubber frame comprises a bearing surface; the bearing surface is provided with at least one group of groove structures, and each group of groove structures comprises at least one groove;
at least one bearing support which is arranged corresponding to at least one group of groove structures one to one; at least one infrared light-emitting element is arranged in the bearing support, and the light-emitting surface of the infrared light-emitting element is intersected with the light-emitting surface of the light guide plate; the bottom of the bearing support is provided with at least one bulge; the protrusion is clamped with the groove.
In a second aspect, an embodiment of the present invention further provides a display device, including the backlight module according to the first aspect; and the infrared photosensitive unit is positioned on one side of the backlight module.
According to the backlight module and the display device provided by the embodiment of the invention, the light guide plate, the backlight source, the rubber frame and the at least one bearing support are arranged in the backlight module, wherein the light emergent surface of the backlight source is opposite to the light incident surface of the light guide plate; the rubber frame fixedly accommodates the light guide plate and the backlight source, the top of at least one side edge of the rubber frame is provided with a bearing surface, the bearing surface is provided with at least one group of groove structures, and each group of groove structures comprises at least one groove; the bearing support is arranged to correspond to the at least one group of groove structures one by one, at least one infrared light-emitting element is arranged in the bearing support, and the light-emitting surface of the infrared light-emitting element is intersected with the light-emitting surface of the light guide plate; the bottom of the bearing bracket is provided with at least one bulge; the arch with the recess block has realized bearing the support and has glued frame fixed connection, can provide the infrared light that is used for fingerprint identification through the infrared light emitting component who bears in the support simultaneously. The embodiment of the invention solves the problem of poor fingerprint identification effect caused by the arrangement position of the infrared light source in the existing fingerprint identification display device, can shorten the distance between the infrared light source and the fingerprint identification area, reduce the light loss of infrared light in the display device, avoid the infrared light from being blocked by components such as a flexible circuit board and the like, ensure the intensity of the infrared light and improve the sensitivity of fingerprint identification; the length of the cover plate glass can be reduced, and the frame of the display panel can be reduced to a certain extent.
Drawings
FIG. 1 is a schematic structural diagram of a conventional lateral fingerprint identification display device;
fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the invention;
FIG. 3 is a schematic cross-sectional view along AA' of the backlight module shown in FIG. 2;
FIG. 4 is a partially enlarged view of the backlight module shown in FIG. 2;
FIG. 5 is a partial film structure of the backlight module shown in FIG. 2;
FIG. 6 is a diagram of another partial film structure of the backlight module shown in FIG. 2;
FIG. 7 is a bottom view of the carrier in the backlight module shown in FIG. 2;
FIG. 8 is a partial exploded view of the backlight module shown in FIG. 2;
FIG. 9 is a side view of a carrier frame of the backlight module shown in FIG. 2;
FIG. 10 is a schematic structural diagram of another backlight module according to an embodiment of the present invention;
FIG. 11 is a schematic view of a carrier frame of the backlight module shown in FIG. 10;
FIG. 12 is a schematic cross-sectional view illustrating another backlight module according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present invention, fig. 3 is a schematic structural diagram of a cross-section of the backlight module shown in fig. 2 along AA', fig. 4 is a schematic partial enlarged view of the backlight module shown in fig. 2, and referring to fig. 2 to 4, the backlight module includes: a light guide plate 10; a backlight 20; the light-emitting surface of the backlight 20 is opposite to the light-entering surface of the light guide plate 10; a rubber frame 30; the rubber frame 30 fixedly accommodates the light guide plate 10 and the backlight 20; the top of at least one side edge of the rubber frame 30 comprises a bearing surface 31; the carrying surface 31 is provided with at least one set of groove structures 310, and each set of groove structures 310 includes at least one groove 311. The backlight module further comprises at least one bearing bracket 41 which is arranged corresponding to the at least one group of groove structures 310 one to one; at least one infrared light emitting element 42 is arranged in the bearing support 41, and the light emitting surface of the infrared light emitting element intersects with the light emitting surface of the light guide plate 10; the bottom of the carrying bracket 41 is provided with at least one protrusion 411; the protrusion 411 engages with the recess 311.
The backlight module utilizes the backlight source 20 to provide light, and the light emitted from the backlight source 20 is scattered and homogenized through the light guide plate 10, so that the backlight module can uniformly emit backlight. The backlight source 20 and the light guide plate 10 are fixedly accommodated in the accommodating cavity formed by the rubber frame 30, and the rubber frame 30 can not only protect the backlight source 20 and the light guide plate 10 from external damage, but also bear and fix the positions of the backlight source 20 and the light guide plate 10. When the backlight module, the liquid crystal display panel, and the cover glass are assembled to form the display module, the rubber frame 30 is also used for supporting the liquid crystal display panel or the cover glass. The glue frame 30 comprises a bottom plate and a side plate to form an accommodating cavity, the side plate can be used for shielding light leakage of the side face on one hand, and a retaining wall (not shown in the figure) can be further arranged and is abutted to the cover plate glass through the top of the retaining wall so as to serve as a supporting structure for bearing the cover plate glass. Besides the light guide plate 10, the backlight module may further include a plurality of optical films disposed on the light exit side of the light guide plate 10 for scattering and homogenizing the backlight emitted from the light guide plate 10, so as to further ensure uniformity of the backlight.
The top of at least one side of the rubber frame 30 is provided with a bearing surface 31, which is substantially the top of a part of a side plate of a certain side of the rubber frame 30 is set to be flat, and the surface of the flat side plate is the bearing surface 31. Meanwhile, at least one bearing bracket 41 is cooperatively disposed in the backlight module, and correspondingly, at least one group of groove structures 310 is disposed on the bearing surface 31 of the rubber frame 30. The groove structure 310 and the supporting bracket 41 can constitute a supporting structure instead of a retaining wall, and can play a role of supporting the cover glass. Specifically, the number of the groove structures 310 and the number of the bearing brackets 41 are the same, and the groove structures 310 and the bearing brackets 41 respectively have the same number of grooves 311 and protrusions 411, that is, at least one protrusion 411 provided on the bearing bracket 41 is correspondingly embedded into at least one groove 311 of the groove structure 310, so that the bearing bracket 41 and the rubber frame 30 are fixedly connected to form the supporting structure. Simultaneously, still be provided with at least one infrared light emitting component 42 in this bearing support 41, when forming fingerprint identification display device with this backlight unit assembly, this infrared light emitting component 42 can provide the fingerprint identification infrared light to fingerprint identification display device's sensitization detection area promptly fingerprint identification district. The infrared light-emitting element 42 for fingerprint identification is arranged at the top of the side edge of the rubber frame 30, and is not required to be arranged below the cover glass and outside the flexible circuit board, so that the length of the cover glass is reduced, the frame of the display panel can be properly reduced, the flexible circuit board can be prevented from blocking infrared light, and the intensity of the infrared light is ensured; meanwhile, in the backlight module provided by the embodiment of the invention, the infrared light-emitting element 42 is closer to the center of the display area and the fingerprint identification area of the display area, so that the loss caused by refraction, reflection or scattering of infrared light in the transmission process can be reduced, the light intensity can be improved, the light signal acquisition of the light sensing element can be ensured, and the sensitivity of fingerprint identification can be improved.
It should be noted that the supporting surface 31 and the supporting bracket 41 can be disposed on at least one arbitrary side of the backlight module according to actual requirements, and the number of the supporting surface 31 and the supporting bracket 41 disposed on one side can also be designed according to requirements. For example, with the fingerprint identification display device as a position reference, a set of bearing surface 31 and a bearing bracket 41 may be respectively disposed in two side regions or two angular positions of a bottom frame of the fingerprint identification display device, and at this time, two infrared light emitting elements 42 in the bearing bracket 41 can provide infrared light with more uniform and stronger light intensity to the fingerprint identification area in the display area. Obviously, because the infrared light emitting element 42 in the supporting frame 41 is disposed on the side of the rubber frame 30, and is correspondingly located in the frame area of the fingerprint identification display device, and the photosensitive detection area of the fingerprint identification display device, i.e. the fingerprint identification area, is generally disposed in the central display area, the light emitting direction of the infrared light emitting element 42 needs to be toward the fingerprint identification area. It can be understood that the light emitting direction of the display module is perpendicular to the light emitting surface of the display device, and therefore, the light emitting direction of the infrared light emitting element 42 intersects the light emitting direction of the light guide plate 10, that is, the light emitting surface of the infrared light emitting element 42 intersects the light emitting surface of the light guide plate 10.
The backlight module provided by the embodiment of the invention is provided with the light guide plate, the backlight source, the rubber frame and at least one bearing bracket, wherein the light emergent surface of the backlight source is opposite to the light incident surface of the light guide plate; the rubber frame fixedly accommodates the light guide plate and the backlight source, the top of at least one side edge of the rubber frame is provided with a bearing surface, the bearing surface is provided with at least one group of groove structures, and each group of groove structures comprises at least one groove; the bearing support is arranged to correspond to the at least one group of groove structures one by one, at least one infrared light-emitting element is arranged in the bearing support, and the light-emitting surface of the infrared light-emitting element is intersected with the light-emitting surface of the light guide plate; the bottom of the bearing bracket is provided with at least one bulge; protruding and recess block have realized bearing the support and have glued frame fixed connection, can provide the infrared light that is used for fingerprint identification through the infrared light emitting component who bears in the support simultaneously. The embodiment of the invention solves the problem of poor fingerprint identification effect caused by the arrangement position of the infrared light source in the existing fingerprint identification display device, can shorten the distance between the infrared light source and the fingerprint identification area, reduce the light loss of infrared light in the display device, avoid the infrared light from being blocked by components such as a flexible circuit board and the like, ensure the intensity of the infrared light and improve the sensitivity of fingerprint identification; the length of the cover plate glass can be reduced, and the frame of the display panel can be reduced to a certain extent.
Referring to fig. 2 to 4, in the backlight module, the light incident surface of the light guide plate 10 is adjacent to the light emitting surface of the light guide plate 10; the side of the rubber frame 30 located on the light incident surface side of the light guide plate 10 is a first side 301; the top of the first side 301 is provided with a first adhesive layer 51; the backlight 20 includes a first flexible circuit board 21 and a plurality of light emitting diodes 22; a first end of the first flexible circuit board 21 is electrically connected to a printed circuit board (not shown); a plurality of light emitting diodes 22 are disposed at one side of the second end of the first flexible circuit board 21; the side of the first flexible circuit board 21 where the light emitting diode 22 is disposed is fixed to the top of the first side 301 through the first adhesive layer 51.
The first flexible circuit board 21 and the plurality of light emitting diodes 22 substantially form a light bar, and the light bar is disposed on one side of the light incident surface of the light guide plate 10 and configured to provide light to the light guide plate 10 from the side surface. The first end of the first flexible circuit board 21 is electrically connected to the printed circuit board, and the plurality of light emitting diodes 22 are disposed on one side of the second end, which is substantially a light emitting driving signal provided by the printed circuit board, and the plurality of light emitting diodes 22 on the printed circuit board are controlled to be lit by the first flexible circuit board 21. In the display device, the printed circuit board is generally disposed on the back surface of the backlight module, and thus the first end of the first flexible circuit board 21 needs to be bent to the back surface of the rubber frame 30 to be electrically connected to the printed circuit board. The first flexible circuit board 21 is disposed at the first side 301 of the rubber frame 30, and the side of the first flexible circuit board 21 where the light emitting diodes 22 are disposed is adhered to the top of the first side 301 through the first adhesive layer 51, substantially the first flexible circuit board 21 is covered on the first side 301 of the rubber frame 20, and the light emitting diodes 22 thereon are located in the gap between the first side 301 and the light guide plate 10.
Fig. 5 is a partial film layer structure diagram of the backlight module shown in fig. 2, fig. 6 is another partial film layer structure diagram of the backlight module shown in fig. 2, fig. 7 is a bottom structure diagram of a carrier bracket in the backlight module shown in fig. 2, fig. 8 is a partial exploded view of the backlight module shown in fig. 2, referring to fig. 2-8, further alternatively, the carrier surface 31 on the rubber frame 30 may be disposed on the top of the first side 301; the first flexible circuit board 21 includes a first branch 211, a second branch 212, and a connection portion 213; the connection part 213 connects the first branch 211 and the second branch 212; wherein, the plurality of light emitting diodes 22 are disposed on the connection portion 213; the first branch 211 is electrically connected to a printed circuit board (not shown); the second branch 212 is fixed on the carrying surface 31 through the first adhesive layer 51, and a first connection terminal 2121 is disposed on a side of the second branch 212 departing from the carrying surface 31; the bottom of the carrier bracket 41 is provided with a second connection terminal 412; the infrared light emitting element 42 is electrically connected to the first connection terminal 2121 via the second connection terminal 412.
In the backlight module structure, the first flexible circuit board 21 is substantially multiplexed. The connecting portion 213 is configured to connect a plurality of light emitting diodes 22, and the second branch 212 is electrically connected to the infrared light emitting device 42 through the first connecting terminal 2121 and the second connecting terminal 412 on the supporting bracket 41. In other words, the first branch 211 of the first flexible circuit board 21 can receive the lighting driving signal on the printed circuit board by being electrically connected to the printed circuit board, and the connection portion 213 and the second branch 212 are respectively connected to the light emitting diode 22 and the infrared light emitting element 42, so that the lighting driving of the light emitting diode 22 and the infrared light emitting element 42 can be respectively realized.
It should be noted that, since the second branch 212 of the first flexible circuit board 21 and the first adhesive layer 51 are disposed between the carrying surface 31 of the adhesive frame 30 and the carrying bracket 41, when the protrusion 411 on the carrying bracket 41 is engaged with the recess 311 on the carrying surface 31, the second branch 212 and the first adhesive layer 51 need to be penetrated. Optionally, by properly designing the patterns of the second branch 212 and the first adhesive layer 51, the orthographic projection of the second branch 212 and the first adhesive layer 51 on the carrying surface 31 is set to be non-overlapped with the orthographic projection of the carrying bracket 41 on the carrying surface 31, and at this time, the protrusion 411 on the carrying bracket 41 can be directly engaged with the groove 311 on the carrying surface 31. Of course, a through hole may be correspondingly formed on the second branch 212 to ensure that the protrusion 411 on the bearing bracket 41 is engaged with the recess 311 of the bearing surface 31. Thus, optionally, at least one first through hole 2122 may be provided on the second branch 212; the orthographic projection of the first through hole 2122 on the bearing surface covers the groove, and the orthographic projection of the first connecting terminal 2121 on the bearing surface does not overlap with the groove 311.
Fig. 9 is a side view of the carrying bracket in the backlight module shown in fig. 2, and referring to fig. 3, 4, 7 and 9, optionally, the carrying bracket 41 may be arranged to include a first side surface 410 perpendicular to the bottom of the carrying bracket 41; the first side surface 410 is provided with an opening structure 4101, and the opening structure 4101 exposes the light emitting surface of the infrared light emitting element 42. At this time, the infrared light emitting element 42 substantially emits light from the side surface of the supporting bracket 41, that is, the light emitting surface of the infrared light emitting element 42 and the light emitting surface of the light guide plate 10 form a certain included angle. Therefore, when fingerprint recognition is performed, the infrared light emitted from the infrared light emitting element 42 can be incident on the fingerprint recognition area, so that the infrared light is reflected at the interface between the finger and the display panel.
It should be noted that, the infrared light emitting element 42 is disposed in the opening on the side surface of the bearing bracket 41 only as an embodiment of the present invention, and it can be understood that, based on the effect of the infrared light emitting element 42 emitting infrared light to the finger of the photosensitive detection area, that is, the fingerprint identification area, a person skilled in the art can design the structure, the shape, the opening orientation, the angle, and the like of the bearing bracket 41, so as to better accommodate the infrared light emitting element 42 and teach the light emitting angle of the infrared light emitting element 42, so that the light emitting surface of the infrared light emitting element 42 faces the photosensitive detection area.
With continued reference to fig. 9, optionally, in order to ensure a fixed connection of the carrier support 41 and the carrier surface 31, a second adhesive layer 52 may be provided at the bottom of the carrier support 41; the second adhesive layer 52 is used for adhering and fixing the carrier bracket 41. The second adhesive layer 52 and the first adhesive layer 51 can be adhered by an optical adhesive, and the second adhesive layer 52 can also be adhered to the bottom surface of the carrier bracket 41 by a double-sided adhesive tape, and is adhered to the carrier surface 31 when being clamped into the groove 311 of the carrier surface 31 of the frame adhesive.
Further, with the fingerprint identification display device as a position reference, when one infrared light emitting element 42 is respectively disposed in two side areas or two angular positions of the bottom frame of the fingerprint identification display device, and the photosensitive detection area, i.e., the fingerprint identification area, is disposed in the central area, the light emitted from the infrared light emitting element 42 is required to face the fingerprint identification area. Therefore, as can be understood by those skilled in the art, an included angle can be maintained between the light emitting surface of the infrared light emitting element 42 and the side surface of the light guide plate 10 in the horizontal direction.
Fig. 10 is a schematic structural diagram of another backlight module according to an embodiment of the invention, fig. 11 is a schematic structural diagram of a supporting bracket of the backlight module shown in fig. 10, and referring to fig. 10 and fig. 11, specifically, the light guide plate 10 may be disposed to include a second side surface 120 adjacent to a light emitting surface of the light guide plate 10; the carrier bracket 41 further includes a third side 430 perpendicular to the bottom of the carrier bracket 41 and adjacent to the first side 410; third side 430 is parallel to second side 120; wherein, the first side surface 410 and the third side surface 430 have an included angle θ, and θ ≠ n (π/2); n is a positive integer.
Since the infrared light emitting element 42 is disposed in the opening of the first side surface 410, the light emitting surface of the infrared light emitting element 42 can be regarded as the first side surface 410, and thus the direction of the first side surface 410 determines the light emitting direction of the infrared light emitting element 42. The first side 410 and the third side 430 are disposed at an angle θ ≠ n (π/2), which means that the first side 410 is not parallel or perpendicular to the third side 430, and has an acute angle. At this time, an acute included angle exists between the third side 430 and the light emitting direction of the side-in type backlight 20, so that it can be ensured that the infrared light emitting element can emit infrared light to the photosensitive detection region, i.e. the fingerprint identification region.
In the backlight module described in the above embodiments, the first flexible circuit board is multiplexed to respectively drive the light emitting diode in the lighting backlight source and the infrared light emitting element in the carrying bracket, which is only one embodiment of the present invention, and a person skilled in the art may also set the flexible circuit board for the infrared light emitting element to perform lighting driving. Fig. 12 is a schematic cross-sectional view of another backlight module according to an embodiment of the invention, referring to fig. 12, optionally, the backlight module further includes a second flexible circuit board 422; a first end of the second flexible circuit board 422 is electrically connected to a printed circuit board (not shown in the figure), and a second end of the second flexible circuit board 422 is fixed on the carrying surface 31; a third connection terminal 4223 is arranged on one side of the second flexible circuit board 422, which is far away from the bearing surface 31; the bottom of the carrier bracket 41 is provided with a second connection terminal 412; the infrared light emitting element 42 is electrically connected to the third connection terminal 4223 through the second connection terminal 412.
Further, at least one second through hole 4220 may be provided on the second flexible circuit board 422; the orthographic projection of the second through hole 4220 on the bearing surface 31 covers the groove 311, and the orthographic projection of the third connecting terminal 4223 on the bearing surface 31 and the groove 311 do not overlap.
The backlight module provided in the above embodiments is substantially a side-in type backlight module, and those skilled in the art will understand that the present invention is also applicable to a direct type backlight module. In the direct-type backlight module, the light incident surface of the light guide plate is opposite to the light emergent surface of the light guide plate; the backlight source comprises a lamp panel and a plurality of light emitting diodes, and the plurality of light emitting diode arrays are arranged on one side, facing the light guide plate, of the lamp panel.
Based on the same inventive concept, the embodiment of the invention also provides a display device. Fig. 13 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 13, the display device includes any one of the backlight modules 100 provided in the above embodiments, and further includes an infrared sensing unit 200 located at one side of the backlight module 100. This display device is the fingerprint identification display device substantially, and at the fingerprint identification in-process, finger touch fingerprint identification district, infrared light ray to fingerprint identification district are launched to infrared light emitting component 42 among backlight unit 100, and infrared light forms the fingerprint identification signal after the finger fingerprint reflection, can realize the discernment of fingerprint through the collection of infrared sensitization unit 200. The display device can be a mobile phone, a computer, an intelligent wearable device and the like.
In addition to the backlight module 100, the display device further includes a liquid crystal display panel 300, a cover glass 400, a printed circuit board, and the like. Specifically, in the display device, the display panel 300 and the infrared sensing unit 200 may be respectively disposed at two opposite sides of the backlight module 100. After the finger launches the formation fingerprint signal to infrared light emitting component 42 in the sensitization detection region, the fingerprint signal is gathered by infrared sensitization unit 200 behind liquid crystal display panel 300 and backlight unit 100, according to infrared fingerprint signal's intensity, can confirm that the finger position that this fingerprint signal corresponds is fingerprint ridge or fingerprint valley, through a plurality of infrared sensitization unit 200's determination, can realize the discernment of fingerprint.
It should be noted that, a person skilled in the art can reasonably set the specific position of the infrared sensing unit according to various fingerprint identification technologies and processes. For example, in the display device provided by the embodiment of the present invention, the infrared photosensitive unit may be further disposed in the display panel, and the photosensitive detection area in the display panel is disposed; or, the infrared photosensitive unit and the display panel can be arranged on the light-emitting side of the backlight module, and the display panel is arranged on one side of the infrared photosensitive unit, which deviates from the backlight module, and the limitation is not made here.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims (12)

1. A backlight module, comprising:
a light guide plate;
a backlight source; the light emitting surface of the backlight source is opposite to the light incident surface of the light guide plate;
a rubber frame; the rubber frame fixedly accommodates the light guide plate and the backlight source; the top of at least one side edge of the rubber frame comprises a bearing surface; the bearing surface is provided with at least one group of groove structures, and each group of groove structures comprises at least one groove;
at least one bearing support which is arranged corresponding to at least one group of groove structures one to one; at least one infrared light-emitting element is arranged in the bearing support, and the light-emitting surface of the infrared light-emitting element is intersected with the light-emitting surface of the light guide plate; the bottom of the bearing support is provided with at least one bulge; the protrusion is clamped with the groove.
2. The backlight module as claimed in claim 1, wherein the light incident surface of the light guide plate is adjacent to the light emergent surface of the light guide plate; the side edge of the rubber frame positioned on the light incident surface side of the light guide plate is a first side edge; a first bonding layer is arranged at the top of the first side edge;
the backlight source comprises a first flexible circuit board and a plurality of light emitting diodes; the first end of the first flexible circuit board is electrically connected with the printed circuit board; a plurality of light emitting diodes are arranged on one side of the second end of the first flexible circuit board;
one side of the first flexible circuit board, where the light emitting diode is arranged, is fixed to the top of the first side edge through the first bonding layer.
3. The backlight module according to claim 2, wherein the top of the first side comprises the carrying surface;
the first flexible circuit board comprises a first branch, a second branch and a connecting part; the connecting part connects the first branch and the second branch;
the plurality of light emitting diodes are arranged on the connecting part; the first branch is electrically connected with the printed circuit board; the second branch is fixed on the bearing surface through the first bonding layer, and a first connecting terminal is arranged on one side, away from the bearing surface, of the second branch;
the bottom of the bearing support is provided with a second connecting terminal; the infrared light emitting element is electrically connected to the first connection terminal through the second connection terminal.
4. The backlight module according to claim 3, wherein the second branch has at least one first through hole;
the orthographic projection of the first through hole on the bearing surface covers the groove, and the orthographic projection of the first connecting terminal on the bearing surface and the groove are not overlapped.
5. The backlight module as claimed in claim 1, wherein the light incident surface of the light guide plate is opposite to the light emergent surface of the light guide plate;
the backlight includes lamp plate and a plurality of emitting diode, and is a plurality of emitting diode array arrange in the lamp plate orientation one side of light guide plate.
6. The backlight module according to claim 2 or 5, further comprising a second flexible circuit board;
the first end of the second flexible circuit board is electrically connected with the printed circuit board, and the second end of the second flexible circuit board is fixed on the bearing surface;
a third connecting terminal is arranged on one side of the second flexible circuit board, which is far away from the bearing surface;
the bottom of the bearing support is provided with a second connecting terminal; the infrared light-emitting element is electrically connected with the third connecting terminal through a second connecting terminal.
7. The backlight module as claimed in claim 6, wherein the second flexible circuit board is provided with at least one second through hole;
the orthographic projection of the second through hole on the bearing surface covers the groove, and the orthographic projection of the third connecting terminal on the bearing surface and the groove are not overlapped.
8. The backlight module according to claim 1, wherein the carrier bracket comprises a first side perpendicular to a bottom of the carrier bracket;
the first side face is provided with an opening structure, and the opening structure exposes the light-emitting face of the infrared light-emitting element.
9. The backlight module as claimed in claim 8, wherein the light guide plate includes a second side surface adjacent to the light exit surface of the light guide plate;
the bearing support further comprises a third side surface which is vertical to the bottom of the bearing support and is adjacent to the first side surface; the third side is parallel to the second side;
wherein the first side surface and the third side surface form an included angle theta, and the theta is not equal to n (pi/2); n is a positive integer.
10. The backlight module as claimed in claim 1, wherein the bottom of the carrier frame is further provided with a second adhesive layer;
the second adhesive layer is used for fixedly adhering the bearing support.
11. A display device, comprising:
a backlight module according to any one of claims 1 to 10;
and the infrared photosensitive unit is positioned on one side of the backlight module.
12. The display device according to claim 11, further comprising: a display panel;
the display panel and the infrared photosensitive unit are respectively positioned on two opposite sides of the backlight module; or the display panel is positioned on one side of the infrared photosensitive unit, which is far away from the backlight module; or, the display panel includes the sensitization detection zone, infrared sensitization unit is located in the sensitization detection zone.
CN202010624272.4A 2020-06-30 2020-06-30 Backlight module and display device Active CN111708226B (en)

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Citations (4)

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CN204629218U (en) * 2014-12-25 2015-09-09 武汉天马微电子有限公司 A kind of back lighting device
WO2017219677A1 (en) * 2016-06-23 2017-12-28 京东方科技集团股份有限公司 Fingerprint recognition display panel and display device
CN208654763U (en) * 2018-07-31 2019-03-26 Oppo广东移动通信有限公司 Display screen component and electronic equipment
CN110515231A (en) * 2019-08-30 2019-11-29 厦门天马微电子有限公司 A kind of display device

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Publication number Priority date Publication date Assignee Title
CN204629218U (en) * 2014-12-25 2015-09-09 武汉天马微电子有限公司 A kind of back lighting device
WO2017219677A1 (en) * 2016-06-23 2017-12-28 京东方科技集团股份有限公司 Fingerprint recognition display panel and display device
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