CN113721388A - Backlight module and display module - Google Patents
Backlight module and display module Download PDFInfo
- Publication number
- CN113721388A CN113721388A CN202111003816.6A CN202111003816A CN113721388A CN 113721388 A CN113721388 A CN 113721388A CN 202111003816 A CN202111003816 A CN 202111003816A CN 113721388 A CN113721388 A CN 113721388A
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- circuit substrate
- light guide
- backlight module
- guide plate
- frame
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- 239000011324 bead Substances 0.000 claims abstract description 158
- 239000000758 substrate Substances 0.000 claims abstract description 87
- 239000002390 adhesive tape Substances 0.000 claims description 40
- 238000009792 diffusion process Methods 0.000 claims description 37
- 230000003287 optical effect Effects 0.000 claims description 31
- 239000003292 glue Substances 0.000 claims description 30
- 238000012545 processing Methods 0.000 claims description 26
- 239000000853 adhesive Substances 0.000 claims description 24
- 230000001070 adhesive effect Effects 0.000 claims description 24
- 238000009826 distribution Methods 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 9
- 239000011230 binding agent Substances 0.000 claims 1
- 239000004033 plastic Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 18
- 238000012360 testing method Methods 0.000 description 17
- 239000011049 pearl Substances 0.000 description 16
- 238000013461 design Methods 0.000 description 13
- 238000009434 installation Methods 0.000 description 8
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Classifications
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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
-
- 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
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- 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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- 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
- G02F1/133612—Electrical details
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention provides a backlight module, which is provided with a middle area and a frame area; the backlight module comprises a back plate; a light bar; is positioned in the frame area; the lamp strip comprises a circuit substrate and a lamp bead, and the circuit substrate is electrically connected with the lamp bead; a reflective sheet; is positioned on the back plate; a light guide plate; the side of the reflector plate, which is far away from the back plate; the reflecting sheet and the light guide plate extend from the middle area to the frame area; the circuit substrate is positioned on one side of the light guide plate, which is far away from the reflector plate; the thickness of the light guide plate is uniform; the light emitting surface of the lamp bead is opposite to the edge end surface of the light guide plate; the part of the backboard corresponding to the frame area is sunken along the direction far away from the reflector plate to form a first groove; the orthographic projection of the reflector plate on the back plate is not overlapped with the orthographic projection of the lamp beads on the back plate. This backlight unit can not only realize super narrow frame, can realize ultra-thin and low-cost moreover, can also improve or solve the problem of the luminous face side hotspot of lamp pearl and bright band simultaneously, promotes backlight unit's backlight effect.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a backlight module and a display module.
Background
Referring to fig. 1 and 2, due to the lack of COF (i.e. the driver chip is integrated on the flexible circuit board), most backlight modules of current display products adopt COG (i.e. the driver chip is not integrated on the flexible circuit board, the driver chip is directly disposed in the frame area of the backlight module) + the mode of backlight source formal installation, the cost of the backlight module formal installation of COG + backlight source is much cheaper than that of the backlight module inversed by COF + backlight source, but the backlight module formal installation of COG + backlight source has the disadvantage of larger frame width, the frame width capable of being produced in mass production is 3.2mm at present, and cannot meet the requirement of narrow frame in the current market, the frame width expected in the current market can be compressed to be less than 3.0mm, not only can the difference between the frame width of the backlight module formal installation of backlight source and the frame width of the backlight source inversed, and can be reduced the rejection of consumer to the increase of the frame width of backlight source formal installation, but also greatly reduces the cost of the backlight module and the display product (such as a mobile phone) adopting the backlight module.
Disclosure of Invention
The invention provides a backlight module and a display module aiming at the problem that the frame width of the backlight module with the COG + backlight source normally installed is larger. This backlight unit can not only realize super narrow frame, can realize ultra-thin and with low cost moreover, can also improve or solve the problem that the bright and dark inequality of lamp pearl luminescent surface side is hotspot and bright band simultaneously, promotes backlight unit's backlight effect.
The invention provides a backlight module, which is provided with a middle area and a frame area;
the backlight module comprises a back plate;
a light bar; the frame area is positioned; the lamp strip comprises a circuit substrate and lamp beads, and the circuit substrate is electrically connected with the lamp beads;
a reflective sheet; located on the back plate;
a light guide plate; the side of the reflector plate facing away from the back plate; the reflecting sheet and the light guide plate extend from the middle area to the frame area;
the circuit substrate is positioned on one side of the light guide plate, which is far away from the reflector plate;
the thickness of the light guide plate is uniform; the light emitting surface of the lamp bead is opposite to the edge end surface of the light guide plate;
the part of the backboard corresponding to the frame area is sunken along the direction far away from the reflector plate to form a first groove;
the orthographic projection of the reflector plate on the back plate is not overlapped with the orthographic projection of the lamp bead on the back plate.
Optionally, the circuit substrate extends along the light-incident side edge of the light guide plate; the number of the lamp beads is multiple, and the lamp beads are arranged at equal intervals along the extending direction of the circuit substrate;
a plurality of bulges are distributed on one side surface of the light guide plate close to the reflector plate; the bulge protrudes towards the direction close to the reflector plate;
in the frame area, the distribution density of the protrusions in the interval area between any two adjacent lamp beads corresponding to the light guide plate is greater than that of the protrusions in the interval area corresponding to the lamp beads of the light guide plate.
Optionally, the lamp further comprises a rubber frame, wherein the rubber frame is positioned in the first groove and positioned on one side of the lamp bead, which is far away from the light guide plate;
the rubber frame and the lamp beads are mutually spaced;
the first end of the circuit substrate is bonded with the light guide plate;
the second end of the circuit substrate is bonded with the rubber frame.
Optionally, a first adhesive tape is arranged between the first end and the light guide plate; the first adhesive tape extends along the extending direction of the circuit substrate;
one side of the first adhesive tape, which is far away from the light emitting surface of the lamp bead, is recessed towards the direction close to the light emitting surface of the lamp bead to form a second groove;
the number of the second grooves is multiple, and the second grooves are distributed at equal intervals along the extending direction of the first adhesive tape;
the distribution positions of the second grooves correspond to the distribution positions of the lamp beads one by one.
Optionally, the width of the opening of the second groove is greater than or equal to the width of the light emitting surface of the lamp bead in the width direction;
the depth of the second groove is smaller than the size of the first adhesive tape in the depth direction; the depth of the second groove is 0.19-0.39 mm; the first strip has a dimension in the depth direction of 0.45mm or more.
Optionally, a first black film is further disposed on a side of the circuit substrate close to the light guide plate;
the orthographic projection of the first black film on the back plate is superposed with the orthographic projection of the circuit substrate on the back plate.
Optionally, the light guide plate further comprises a diffusion sheet located on a side of the light guide plate facing away from the reflection sheet;
the diffusion sheet extends from the middle area to the frame area;
the edge of one side of the diffusion sheet close to the light bar is opposite to the first end of the circuit substrate and is spaced from the first end of the circuit substrate;
the backlight module also comprises a second black film which is positioned between the diffusion sheet and the light guide plate, the orthographic projection of the second black film on the back plate is positioned in the frame area, and the second black film extends to a first boundary line from one side edge of the diffusion sheet close to the first end of the circuit substrate to the direction far away from the circuit substrate in a plane parallel to the diffusion sheet;
the distance between the first boundary line and the boundary line of the frame area is more than 0 mm.
Optionally, the diffusion sheet further comprises an optical processing film layer located on a side of the diffusion sheet facing away from the back plate, the optical processing film layer extends from the middle area to the frame area, and an orthographic projection of an edge of the optical processing film layer on the back plate falls within an orthographic projection of the diffusion sheet on the back plate;
the backlight module also comprises shading glue which is positioned on one side of the circuit substrate and the optical processing film layer, which is away from the back plate; the orthographic projection of the shading glue on the back plate is superposed with the frame area; the shading glue is attached to the circuit substrate and the optical processing film layer;
the shading glue and the diffusion sheet are bonded through a second adhesive tape; the orthographic projection of the second adhesive tape on the back plate is positioned between the orthographic projection of the optical processing film layer on the back plate and the orthographic projection of the circuit substrate on the back plate, and the orthographic projection of the second adhesive tape on the back plate is respectively spaced from the orthographic projection of the optical processing film layer on the back plate and the orthographic projection of the circuit substrate on the back plate.
Optionally, a width range of the frame region in a direction away from the middle region is 3.0mm or less.
Optionally, the depth range of the first groove is 0.05-0.1 mm;
the distance range between one side edge of the reflector plate close to the light emitting surface of the lamp bead and the light emitting surface of the lamp bead is 0.15-0.2 mm.
Optionally, the middle area is used for corresponding to a display area of a display panel, and a sub-pixel array is arranged in the display area;
the distance between the boundary line of the frame area and the edge of one row or one column of sub-pixels of the middle area, which is close to the outermost edge of the frame area, ranges from 0.2mm to 0.3 mm.
Optionally, a distance between an edge of the diffusion sheet close to the light bar and the first end of the circuit substrate is in a range of 0.15-0.2 mm;
the spacing distance between the lamp beads and the rubber frame ranges from 0.12mm to 0.15 mm;
the width range of the rubber frame along the direction far away from the lamp beads is more than 0.25 mm.
Optionally, the arrangement of the lamp beads satisfies:
△AP＝(S2+E)/(B+C)≥0.456；A≥0.1mm；
wherein Δ AP is the light mixing capability of the frame region; s2 is the distance between the boundary line of the frame area and the line or column of sub-pixels of the middle area close to the outermost edge of the frame area; e is the distance between the light emitting surface of the lamp bead and the boundary line of the frame area where the lamp bead is located; b is the spacing distance between two adjacent lamp beads; c is the distance between the centers of the light emitting surfaces of two adjacent lamp beads; a is the distance between the intersection point of the edge light rays emitted by two lamp beads with one lamp bead in the middle and the boundary line of the frame area where the lamp beads are located.
Optionally, the backlight module further comprises edge wrapping glue wrapping the edge end faces of the back plate, the glue frame and the shading glue.
The invention also provides a display module, which comprises a display panel and the backlight module;
the display panel includes a display side and a back side, the display side being opposite the back side; the backlight module is located on the back side of the display panel and used for providing display backlight for the display panel.
The invention has the beneficial effects that: the backlight module provided by the invention not only can realize an ultra-narrow frame, but also can realize ultra-thinness and low cost, and simultaneously can improve or solve the problems of hotspots and bright bands on the light-emitting surface side of the lamp bead, thereby improving the backlight effect of the backlight module.
By adopting the backlight module, the display module provided by the invention not only can realize the ultra-narrow frame of the display module, but also can realize the ultra-thinness and low cost of the display module, thereby better meeting the requirements of users.
Drawings
Fig. 1 is a frame iteration diagram of a display module of a backlight module adopting a COF frame;
FIG. 2 is a frame iteration diagram of a display module of a backlight module employing a COG frame;
FIG. 3 is a schematic cross-sectional view of a frame region of a backlight module with a COG + backlight source being installed;
FIG. 4 is a schematic diagram illustrating an effect of a bright band appearing on a light-emitting surface side of the lamp bead when the backlight module in FIG. 3 is turned on;
FIG. 5 is a schematic diagram illustrating a bright band appearing on a light-emitting surface side of the lamp bead when the backlight module in FIG. 3 is turned on;
FIG. 6 is a schematic cross-sectional view illustrating a structure of a frame region of a backlight module according to an embodiment of the present invention;
FIG. 7 is a schematic view of the light-emitting surface side of the lamp bead improving or avoiding the bright band when the backlight module in FIG. 6 is turned on;
FIG. 8 is a schematic view of the effect of improving or avoiding bright bands on the light-emitting surface side of the lamp bead when the backlight module in FIG. 6 is turned on;
FIG. 9 is a top view of the first strip of adhesive and the second strip of adhesive joined together in accordance with an embodiment of the present invention;
FIG. 10 is a diagram illustrating the dimension of each film layer in the frame area of the backlight module shown in FIG. 6;
FIG. 11 is a schematic top view of a protrusion on a light guide plate according to an embodiment of the present invention;
FIG. 12 is a schematic top view of a second groove on the first adhesive tape according to an embodiment of the present invention;
FIG. 13 is a schematic view of a lamp bead arrangement model in the embodiment of the present invention;
FIG. 14 is a graph illustrating the relationship between the light mixing capability of the frame region and the distance A of the backlight module according to the embodiment of the present invention;
FIG. 15 is a diagram of the sample backlight effect of the bead arrangement model according to the embodiment of the present invention with a better bright band improvement effect and the sample backlight effect with a poor bright band improvement effect;
fig. 16 is a schematic diagram of the distribution of test points of a lamp bead arrangement model for testing the conditions of better bright band improvement effect and poor bright band improvement effect;
FIG. 17 is a graph of comparative data of the frame region width, the light guide plate thickness and the cost of three different types of backlight modules.
Wherein the reference numerals are:
1. a back plate; 10. a first groove; 2. a light bar; 21. a circuit substrate; 211. a first end; 212. a second end; 22. a lamp bead; 3. a reflective sheet; 4. a light guide plate; 41. a protrusion; 101. a middle zone; 102. a frame area; 5. a first adhesive glue; 6. a rubber frame; 7. a first adhesive tape; 71. a second groove; 8. a second adhesive glue; 9. A first black film; 11. a diffusion sheet; 12. a second black film; 13. optically treating the film layer; 14. shading glue; 15. A second adhesive tape; 16. edge covering glue; p, testing points; q, submatrix; 78. and (4) opening.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, a backlight module and a display module according to the present invention are described in further detail below with reference to the accompanying drawings and the detailed description.
At present, referring to fig. 3-5, on the premise that the width of the backlight module frame area 102 of the COG + backlight source normal installation is narrowed to be below 3.0mm, the backlight module is required to be made into an ultrathin scheme, and the backlight source comprises lamp beads 22 and a circuit substrate 21 electrically connected with the lamp beads 22; the light emitting surface of the backlight module lamp bead 22 of the backlight source normal installation faces the edge end face (i.e. the light incident surface) of the light guide plate 4, in order to increase the light utilization rate of the backlight source and make the circuit substrate 21 of the backlight source adhere firmly, the light incident surface side of the light guide plate 4 adopts the design of a wedge-shaped horn mouth, and other areas of the light guide plate 4 adopt the design of a flat plate. The design of the wedge-shaped horn mouth can increase the risk of hot spots on the light emitting surface side of the lamp bead 22 (namely, the brightness of the light emitting surface of the lamp bead is greater than that of the spacing area between the adjacent lamp beads) and the risk of bright bands (namely, the brightness of the side frame where the backlight source is located is obviously higher), especially when the width of the frame area 102 of the backlight module is smaller, the optical path of light emitted by the backlight source is shorter, and the risk of the hot spots and the bright bands on the light emitting surface side of the lamp bead 22 is greater.
Referring to fig. 5, when the width of the backlight module frame region 102 of the COG + backlight source normal installation is narrowed to be less than 3.0mm, the light incident surface side of the light guide plate 4 adopts the wedge-shaped bell mouth design to increase the principle analysis of hot spot and bright band risk on the light emitting surface side of the lamp bead 22: according to practical verification, when the light mixing distance a of the lamp beads is less than or equal to 1.75mm, and the difference b between the wedge-shaped horn mouth area and the flat plate area of the light guide plate 4 is less than or equal to 0.02mm, the problem of bright band after the reliability test of the backlight source can be effectively solved; however, because the ultra-thin design of the light guide plate 4 with the thickness reduced from 0.37mm or 0.34mm to 0.32mm is compatible, the thickness of the lamp bead 22 is kept unchanged, and the problem that the difference between the wedge-shaped horn mouth area and the flat plate area of the light guide plate 4 is too large exists according to the design scheme of the mass production of the backlight module in fig. 3, and the large difference easily causes the light emitted by the lamp bead 22 to sharply reduce the propagation viewing angle in the transmission process, referring to fig. 5, when the optical lengths are the same, the design scheme of the mass production of the backlight module in fig. 3 is that the light incident side of the light guide plate 4 is the wedge-shaped horn mouth design, the included angle between the outermost edge light ray of the lamp bead 22 incident on the light guide plate 4 and the light emitting surface of the lamp bead is 30 °, and the angle between the emergent ray of the outermost edge light transmitted from the frame area 102 to the middle area 101 of the corresponding display area and the light emitting surface of the lamp bead 22 is 12 °, which causes all the light emitted by the lamp bead 22 to be reduced in viewing angle and more concentrated when the light is emitted from the frame area 102 to the middle area 101, thereby leading to a bright band on the display effect of the display product adopting the backlight module.
In addition, the ultra-narrow frame of the backlight module needs to reduce the risks of hotspots and bright bands on the light emitting surface side of the lamp bead 22, the difference between the wedge-shaped horn mouth area of the light guide plate 4 and the flat plate area is required to be less than or equal to 0.02, so that the thickness of the flat plate area of the light guide plate 4 is limited by the thickness of the wedge-shaped horn mouth area, the backlight module cannot be thin, and the mass production scheme cannot meet the market or the customer requirements. If the design scheme of mass production of the backlight module in fig. 3 needs to be thinned, the thickness of the wedge-shaped horn mouth area of the light guide plate 4 must be reduced while the thickness of the flat plate area of the light guide plate 4 is reduced, because one end of the backlight circuit substrate 21 which is positively installed is attached to the wedge-shaped horn mouth area of the light guide plate 4, and the other end is attached to the rubber frame 6 of the lamp bead 22 which is deviated from the side of the light guide plate 4, in order to ensure that the lamp bead 22 is not inclined after the circuit substrate 21 is attached, the rubber frame 6 also needs to be correspondingly reduced in height, the flat backboard 1 in fig. 3 and the reflector plate 3 which extends to the lower part of the lamp bead 22 directly cause the structural interference of the lamp bead 22 and the reflector plate 3, so that the fold of the reflector plate 3 influences the light effect; meanwhile, the lamp bead 22 can contact with the reflector plate 3 located below the lamp bead 22, and the lamp bead 22 generates high heat when emitting light, so that the reflector plate 3 is wrinkled, and the unevenness of the reflector plate 3 can cause poor light-emitting side beams and poor color difference of the lamp bead 22.
In view of the problem that the frame width of the backlight module with the COG + backlight source normally installed is large, an embodiment of the present invention provides a backlight module, which, referring to fig. 6 to 10, has a middle area 101 and a frame area 102; the backlight module comprises a back plate 1; a light bar 2; located in the border area 102; the lamp strip 2 comprises a circuit substrate 21 and lamp beads 22, and the circuit substrate 21 is electrically connected with the lamp beads 22; a reflective sheet 3; is positioned on the back plate 1; a light guide plate 4; is positioned at one side of the reflector plate 3 which is far away from the back plate 1; the reflective sheet 3 and the light guide plate 4 extend from the middle region 101 to the frame region 102; the circuit substrate 21 is positioned on one side of the light guide plate 4, which is far away from the reflecting sheet 3; the thickness of the light guide plate 4 is uniform; the light emitting surface of the lamp bead 22 is opposite to the edge end surface of the light guide plate 4; the part of the backboard 1 corresponding to the frame area 102 is recessed along the direction far away from the reflector plate 3 to form a first groove 10; the orthographic projection of the reflector 3 on the back plate 1 and the orthographic projection of the lamp bead 22 on the back plate 1 do not overlap.
Wherein, the frame region 102 surrounds the periphery of the middle region 101; the light bar 2 is located in at least one side frame area 102. In this embodiment, the light bar 2 is of a front-mounted design; the front-mounting is that the light bar 2 is arranged on one side of the light guide plate 4 departing from the back plate 1, and the circuit substrate 21 is attached to one side of the light guide plate 4 departing from the back plate 1. The light-emitting surface of the lamp bead 22 is arranged opposite to the edge end surface of the light guide plate 4, further, the edge end surface of the light guide plate 4 is attached to or directly contacted with the light-emitting surface of the lamp bead 22, and the narrow frame is further reduced; compare with backlight unit in fig. 3, the clearance between lamp pearl 22 and the light guide plate 4 is adjusted to 0mm by 0.05mm, and the actual management and control precision of lamp pearl 22 and the equipment of light guide plate 4 is adjusted to 0 ~ 0.08mm by 0 ~ 0.1 mm. The orthographic projection of the lamp bead 22 on the back plate 1 falls into the first groove 10, and the lamp bead 22 and the first groove 10 are mutually spaced; thus preventing mutual interference between the lamp beads 22 and the back plate 1. The reflector plate 3 is bonded with the first groove 10 through first bonding glue 5; the first adhesive 5 can also support the reflective sheet 3, so that the portion of the reflective sheet 3 located in the frame area 102 and the portion located in the middle area 101 can be in the same plane, thereby ensuring the normal reflection of light by the reflective sheet 3. In this embodiment, the thickness of the first adhesive 5 is designed to be 0.01mm, that is, the gap between the reflector plate 3 and the back plate 1 is 0.05mm, and the thickness of the first adhesive 5 is designed to be 0.06mm, so as to ensure the compaction of the reflector plate 3 and the light guide plate 4, and avoid the optical abnormality caused by the direct injection of the light beam of the lamp bead 22 from between the light guide plate 4 and the reflector plate 3 into the middle area 101. Further, the uniform thickness of the light guide plate 4 means that the light guide plate 4 has a uniform thickness within the error range (i.e., +/-0.015 mm) of the thickness preparation process, and the light emitting surface of the light guide plate 4 is a plane, i.e., the light guide plate 4 is a flat plate with a uniform thickness; on the one hand, the overall thickness of the backlight module can be reduced, so that the backlight module is thinner and thinner; on the other hand, referring to fig. 7 and 8, compared to the backlight module scheme in fig. 3, there is no step difference between the portion of the light guide plate 4 near the light emitting surface of the lamp bead 22 and other portions, that is, the step difference is zero, the propagation viewing angle of the light emitted by the lamp bead 22 in the transmission process does not change, if the light emitting range of the lamp bead 22 is an angle range of 30 ° to 120 ° with the light emitting surface of the lamp bead 22, the propagation angle of the light does not change because the flat light guide plate 4 does not change, that is, the angles of the emergent light and the incident light passing through the light guide plate 4 are the same; if the included angle between the light ray incident to the outermost edge of the light guide plate 4 of the lamp bead 22 and the light emitting surface of the lamp bead 22 is 30 °, the included angle between the emergent light ray when the light ray at the outermost edge is transmitted from the frame region 102 to the middle region 101 and the light emitting surface of the lamp bead 22 is still 30 °, and therefore the problem of a bright band after the reliability test of the backlight source at present can be effectively solved.
Optionally, the depth h1 of the first groove 10 ranges from 0.05mm to 0.1 mm; the interval distance h2 scope between the light emitting area of the lamp pearl 22 and the edge of one side of reflector plate 3 that is close to the light emitting area of lamp pearl 22 is 0.15 ~ 0.2 mm. That is, the reflector 3 in the present embodiment is retracted from the frame region 102 toward the middle region 101, as compared to the conventional solution in fig. 3. Backplate 1 is sunken and the reflector plate 3 is in the design that the relative lamp pearl 22 luminous surface of lamp pearl contracts in the region that corresponds frame district 102, the assembly process precision when can not only ensuring lamp strip 2 and backplate 1 equipment, and reflector plate 3 can not contact lamp pearl 22 after actually assembling, can solve the structure interference problem between lamp pearl 22 and the reflector plate 3, can also avoid reflector plate 3 that reflector plate 3 and lamp pearl 22 light emitting area distance lead to too closely to produce the risk of fold under the effect of lamp pearl 22 heat simultaneously. However, after the reflector 3 is retracted, the problem of hotspot and bright band, which are the uneven brightness on the light-emitting surface side of the lamp bead, is indirectly reduced because the reflected light received on the light-emitting surface side of the lamp bead is reduced, but the loss of the overall brightness of the backlight module due to the hotspot and bright band is expected to be 3% to 5%.
In the present embodiment, the circuit substrate 21 extends along the light-incident-side edge of the light guide plate 4; the quantity of lamp pearl 22 is a plurality of, and a plurality of lamp pearls 22 are arranged along the extending direction of circuit substrate 21 equidistance. The backlight module further comprises a rubber frame 6 which is positioned in the first groove 10 and positioned on one side of the lamp bead 22, which is far away from the light guide plate 4; the rubber frame 6 and the lamp beads 22 are mutually spaced; the first end 211 of the circuit substrate 21 is bonded to the light guide plate 4; the second end 212 of the circuit substrate 21 is bonded with the rubber frame 6; the second end 212 of the circuit substrate 21 is opposite to the first end 211, and the second end 212 is located on the same plane as the first end 211. Since the light guide plate 4 is a flat plate, the second end 212 and the first end 211 of the circuit substrate 21 can be located on the same plane by only making the height of the rubber frame 6 the same as that of the light guide plate 4, so that the lamp beads 22 are not inclined after the circuit substrate 21 is attached to the light guide plate 4 and the rubber frame 6.
Wherein, the direction from the first end 211 to the second end 212 of the circuit substrate 21 is the width direction of the circuit substrate 21, and the extending direction of the circuit substrate 21 is the length direction of the circuit substrate 21.
In this embodiment, a first adhesive tape 7 is disposed between the first end 211 of the circuit substrate 21 and the light guide plate 4, and the first adhesive tape 7 extends along the extending direction of the circuit substrate 21; the first end 211 is bonded with the light guide plate 4 through a first adhesive tape 7; the second end 212 of the circuit substrate 21 is bonded with the rubber frame 6 by arranging the second bonding glue 8. The side of the first adhesive tape 7 bonded to the light guide plate 4 is transparent adhesive, and the side bonded to the first end 211 of the circuit substrate 21 is black adhesive, so that normal light transmission of the light guide plate 4 can be ensured, and light leakage at the first end 211 of the circuit substrate 21 can be prevented. In this embodiment, referring to fig. 9, the first adhesive tape 7 and the second adhesive tape 8 are connected to form a whole, an opening 78 is formed in a region corresponding to the bead 22 of the integrated adhesive tape, and the bead 22 is electrically connected to the circuit substrate 21 through the opening 78.
In this embodiment, a first black film 9 is further provided on a side surface of the circuit substrate 21 close to the light guide plate 4; the orthographic projection of the first black film 9 on the rear panel 1 coincides with the orthographic projection of the circuit substrate 21 on the rear panel 1. The first black film 9 is provided to prevent light leakage at the circuit substrate 21. Wherein, the circuit substrate 21 area except the pin welded with the circuit substrate 21 of the lamp bead 22, are all covered by the first black film 9; and after the lamp beads 22 are welded with the circuit substrate 21, the welding connection surface can be coated with the first black film 9 to cover the circuit substrate 21 substantially on the front surface.
In this embodiment, the backlight module further includes a diffusion sheet 11 located on a side of the light guide plate 4 away from the reflection sheet 3; the diffusion sheet 11 extends from the middle area 101 to the frame area 102; one side edge of the diffusion sheet 11 close to the light bar 2 is opposite to and spaced from the first end 211 of the circuit substrate 21; the backlight module further comprises a second black film 12, which is positioned between the diffusion sheet 11 and the light guide plate 4, wherein the orthographic projection of the second black film 12 on the back plate 1 is positioned in the frame area 102, and the second black film 12 extends to a first boundary line L1 from one side edge of the diffusion sheet 11 close to the first end 211 of the circuit substrate 21 in a plane parallel to the diffusion sheet 11 in a direction away from the circuit substrate 21; the distance S1 between the first boundary line L1 and the boundary line L2 of the frame region 102 is 0mm or more. The second black film 12 is provided to prevent light leakage in the region of the frame region 102 other than the region covered by the first black film 9; on the other hand, the hotspot phenomenon and the bright band risk, which are uneven brightness on the light-emitting surface side of the lamp bead 22, can be improved. The diffusion sheet 11 can perform diffusion processing on the backlight light emitted from the light guide plate 4 to make the light in the intermediate area 101 more uniform.
In this embodiment, the backlight module further includes an optical processing film layer 13 located on a side of the diffusion sheet 11 away from the back plate 1, the optical processing film layer 13 extends from the middle area 101 to the frame area 102, and an orthographic projection of an edge of the optical processing film layer 13 on the back plate 1 falls into an orthographic projection of the diffusion sheet 11 on the back plate 1; the backlight module also comprises a light shading glue 14 which is positioned on one side of the circuit substrate 21 and the optical processing film layer 13 which is far away from the back plate 1; the orthographic projection of the light shading glue 14 on the back plate 1 is superposed with the frame area 102; and the shading glue 14 is jointed with the circuit substrate 21 and the optical processing film layer 13; the shading glue 14 and the diffusion sheet 11 are bonded through a second glue strip 15; the orthographic projection of the second adhesive tape 15 on the back plate 1 is positioned between the orthographic projection of the optical processing film layer 13 on the back plate 1 and the orthographic projection of the circuit substrate 21 on the back plate 1, and the orthographic projection of the second adhesive tape 15 on the back plate 1 is respectively spaced from the orthographic projection of the optical processing film layer 13 on the back plate 1 and the orthographic projection of the circuit substrate 21 on the back plate 1.
The optical processing film layer 13 further processes the backlight light emitted from the diffusion sheet 11 to make the backlight light more uniform. The light-shielding adhesive 14 is black ink or black tape, and is used to shield the whole frame region 102, so that light leakage does not occur in the frame region 102. The second adhesive tape 15 is used for fixedly bonding the light shielding adhesive 14 and the diffusion sheet 11, so that the structure of the backlight module is more stable. The second adhesive tape 15 does not overlap with the optical processing film layer 13 and the circuit substrate 21. The optical processing film 13 includes a prism sheet and other films.
In this embodiment, the backlight module further includes an edge covering adhesive 16, which covers the edge end faces of the back plate 1, the adhesive frame 6 and the light shielding adhesive 14. The edge covering glue 16 is a black adhesive tape, and the edge covering glue 16 can firmly fix the assembled back plate 1, the glue frame 6 and the shading glue 14 and can also prevent light leakage of a wrapping area of the back plate.
In this embodiment, referring to fig. 10, the width SZ of the frame area 102 in the direction away from the middle area 101 ranges from 3.0mm or less. The middle area 101 is used for corresponding to a display area of the display panel, and a sub-pixel array is arranged in the display area; the distance S2 between the boundary line L2 of the frame region 102 and the edge L3 of the middle region 101 of the sub-pixel row or column near the outermost edge of the frame region 102 is in the range of 0.2-0.3 mm, for example, the distance S2 is 0.20 mm. The assembling precision of the corresponding light shielding glue 14 is changed from 0.12mm to 0.1mm, and the problem that the backlight module does not shield the sub-pixels is actually verified, and at this time, the light mixing distance of the frame area 102 can be increased by 0.03mm compared with the backlight module in fig. 3. The spacing distance S3 between the edge of one side of the diffusion sheet 11 close to the light bar 2 and the first end 211 of the circuit substrate 21 is 0.15-0.2 mm; the spacing distance S4 between the lamp beads 22 and the rubber frame 6 ranges from 0.12mm to 0.15 mm; the width S5 range of the rubber frame 6 along the direction far away from the lamp bead 22 is more than 0.25 mm. The overlapping width S6 of the optical treatment film layer 13 and the light shielding adhesive 14 is 0.32mm or more, for example, 0.35mm in S6. The spacing distance S7 between the second adhesive tape 15 and the optical treatment film layer 13 is 0.15-0.2 mm, for example, S7 is 0.15 mm. The width S8 of the second strip 15 along the direction of arrangement of the middle region 101 and the frame region 102 is 0.35mm or more, for example, S8 is 0.38 mm. The width S9 of the first adhesive tape 7 along the arrangement direction of the middle area 101 and the frame area 102 is 0.45mm or more. The spacing distance S10 between the first adhesive tape 7 and the light emitting surface of the lamp bead 22 is more than 0.1 mm. The width S11 of the bead 22 along the arrangement direction of the middle area 101 and the border area 102 is 0.6 mm. The spacing distance S12 between the second adhesive 8 and the back face of the lamp bead 22 opposite to the light-emitting face is more than 0.1 mm. The width S13 of the second adhesive 8 along the arrangement direction of the middle area 101 and the frame area 102 is 0.25mm or more. The thickness S14 of the edge covering adhesive 16 is 0.03 mm.
In fig. 3, the width of the backlight module frame area 102 along the direction away from the middle area 101 is more than 3.2 mm. The distance between the boundary of the frame region 102 and the edge of the middle region 101 close to the outermost edge of the frame region 102 is 0.23mm or more. The spacing distance between one side edge of the diffusion sheet 11 close to the light bar 2 and the first end 211 of the circuit substrate 21 is 0.20 mm; the spacing distance between the lamp beads 22 and the rubber frame 6 is 0.15 mm; the width of the rubber frame 6 along the direction far away from the lamp beads 22 is 0.4 mm. In addition, the lapping width of the optical processing film layer 13 and the light shielding glue 14 is 0.37 mm. The second strip 15 is spaced from the optical treatment film layer 13 by a distance of 0.15 mm. The width of the second adhesive tape 15 along the arrangement direction of the middle area 101 and the frame area 102 is 0.40 mm. The width of the first adhesive tape 7 along the arrangement direction of the middle area 101 and the frame area 102 is 0.55 mm. The spacing distance between the light emitting surfaces of the first adhesive tape 15 and the lamp bead 22 is 0.15 mm. The width of the lamp bead 22 along the arrangement direction of the middle area 101 and the frame area 102 is 0.6 mm. The spacing distance between the second adhesive glue 8 and the back face, opposite to the light-emitting face, of the lamp bead 22 is 0.1 mm. The width of the second adhesive 8 along the arrangement direction of the middle area 101 and the frame area 102 is 0.4 mm. The thickness of the edge covering glue 16 is 0.03 mm.
Compared with the design sizes of the backlight module frame area in fig. 3, the width size of each film layer structure of the backlight module frame area 102 and the spacing distance size between the film layer structures in the embodiment are set, so that the width of the backlight module frame area 102 in the embodiment is obviously reduced relative to the width of the backlight module frame area 102 in fig. 3, and thus the difference between the width of the backlight module frame area 102 positively installed with the light bar 2 and the width of the backlight module frame area inversely installed with the light bar is reduced, and the rejection of consumers to the increase of the width of the positively installed frame with the light bar 2 is further reduced.
In this embodiment, referring to fig. 11, a plurality of protrusions 41 are distributed on a side surface of the light guide plate 4 close to the reflective sheet 3; the projection 41 projects in a direction approaching the reflection sheet 3; in the frame region 102, the distribution density of the protrusions 41 in the spacing region between any two adjacent light beads 22 corresponding to the light guide plate 4 is greater than the distribution density of the protrusions in the region of the light guide plate 4 corresponding to the light beads 22. The protrusions 41 are distributed like this, so that the brightness of the corresponding area of the light emitting surface of the bead 22 in the frame area 102 can be reduced, and the brightness of the interval area between adjacent beads 22 in the frame area 102 is improved, so that the light mixing of the light rays emitted by the beads 22 is more uniform.
In this embodiment, referring to fig. 12, one side of the first adhesive tape 7 away from the light emitting surface of the bead 22 is recessed toward the direction close to the light emitting surface of the bead 22 to form a second groove 71; the number of the second grooves 71 is multiple, and the multiple second grooves 71 are arranged at equal intervals along the extending direction of the first rubber strip 7; the distribution positions of the second grooves 71 correspond to the distribution positions of the lamp beads 22 one by one. The side of the first adhesive tape 7 bonded to the light guide plate 4 is made of transparent adhesive, and the side bonded to the first end 211 of the circuit substrate 21 is made of black adhesive, so that the light homogenization treatment of the light guide plate 4 is not affected, and light leakage from the side bonded to the circuit substrate 21 is prevented. The arrangement of the second groove 71 can reduce the brightness of the corresponding area of the light emitting surface of the bead 22 in the frame area 102, and improve the brightness of the interval area between adjacent beads 22 in the frame area 102, so that the light mixing of the light emitted by the bead 22 is more uniform.
Optionally, the opening width n of the second groove 71 is greater than or equal to the width m of the light emitting surface of the lamp bead 22 in the width direction; the depth y of second groove 71 is smaller than the dimension S9 of first strip 7 in the depth direction (i.e. the width of first strip 7 in the direction in which intermediate zone 101 and border zone 102 are arranged). Optionally, the opening width of the second groove 71 is 3.0 mm; the width of the light emitting surface of the lamp bead 22 in the width direction of the second groove 71 is 2.8 mm; the depth of the second groove 71 is 0.19-0.39 mm; such as a depth of 0.29mm for the second groove 71. The dimension S9 of the first rubber strip 7 in the depth direction of the second groove 71 is 0.45mm or more, for example, S9 is 0.6 mm. The dimension design of the second groove 71 can ensure that the first end 211 of the circuit substrate 21 and the light guide plate 4 are stably fixed through the first adhesive tape 7; on the other hand, the brightness of the corresponding area of the luminous surface of the frame area 102 lamp bead 22 can be reduced, and the brightness of the interval area between the adjacent lamp beads 22 in the frame area 102 is improved, so that the light mixing of the light rays emitted by the lamp beads 22 is more uniform.
In this embodiment, referring to fig. 13, through experimental analysis, the best arrangement model of the lamp beads 22 when the backlight module with the positive COG + lamp strip 2 is installed and the narrow frame below 3.0mm is realized, that is, the arrangement of the lamp beads 22 satisfies:
△AP＝(S2+E)/(B+C)≥0.456；A≥0.1mm；
wherein Δ AP is the light mixing capability of the frame area 102; s2 is the distance between the boundary line L2 of the frame region 102 and the edge L3 of one row or column of sub-pixels of the middle region 101 near the outermost edge of the frame region 102; e is the distance between the light emitting surface of the lamp bead 22 and the boundary line L2 of the frame area 102 where the light emitting surface is located; b is the spacing distance between two adjacent lamp beads 22; c is the distance between the centers of the light emitting surfaces of two adjacent lamp beads 22; a is a distance between an intersection O of edge light rays emitted from two lamp beads 22 with one lamp bead 22 in between and a boundary line L2 of the frame region 102 where the lamp beads 22 are located.
Referring to fig. 14, a curve showing a correspondence between Δ AP values and a values; referring to fig. 14 and 15, "OK Area" is a corresponding value of Δ AP and a corresponding sample backlight effect that are better for improvement effects of hotspots and bright bands on the light emitting surface side of the lamp beads 22 in the arrangement model of the lamp beads 22; "NG Area" is a corresponding value of Δ AP and a with poor improvement effect on the luminescent surface side hotspots and bright bands of the beads 22 in the bead 22 arrangement model and a corresponding sample backlight effect.
Referring to fig. 16, the standard for testing and determining whether the bead 22 arrangement model is "OK Area" or "NG Area" is: designing 3K +3 backlight brightness test points P in the area of the side frame area of the middle area 101 adjacent to the light bar; the 3K +3 test points are arranged to form a uniform matrix; the matrix comprises a plurality of sub-matrices Q, each sub-matrix Q is formed by 9 test points P which are adjacent in rows and columns, and the sub-matrices Q are distributed corresponding to two adjacent light beads 22. Testing the backlight brightness at each test point P; in 1 to (3K +3) test points P of the matrix, when the percentage of the backlight brightness of the test point P with the minimum backlight brightness divided by the backlight brightness of the test point P with the maximum backlight brightness is greater than or equal to 75%, and the percentage of the backlight brightness of the test point P with the minimum backlight brightness divided by the backlight brightness of the test point P with the maximum backlight brightness among 9 test points P of the submatrix Q is greater than or equal to 80%, determining the corresponding bead 22 arrangement model as "OK Area"; otherwise, the corresponding bead 22 arrangement model is determined as "NG Area".
In this embodiment, referring to fig. 17, for the lamp strip flip-chip + the backlight module that the light guide plate is dull and stereotyped, in the backlight module that the lamp strip is just adorned + the light guide plate is the wedge (as backlight module in fig. 3) and the backlight module that the lamp strip is just adorned + the light guide plate is the flat board (backlight module in this embodiment), when adopting the lamp pearl of same model (if adopting 3004 type, the lamp pearl of this model is long, wide, when high (thickness promptly) is 3.0mm, 0.85mm, 0.4mm respectively), the frame district width of different backlight module, the contrast of light guide plate thickness and cost. As can be seen from fig. 17, in the backlight module provided in this embodiment, compared to the backlight module in fig. 3 and the backlight module in which the light bar flip chip and the light guide plate are flat plates, the width and the cost of the frame area are both greatly reduced, so as to better meet the requirements of users. In addition, in the display module that adopts three kinds of different grade type backlight unit in fig. 17, backlight unit's display module in this embodiment for adopting backlight unit and lamp strip flip-chip + light guide plate to be flat backlight unit's display module in fig. 3, the thickness of each rete and display module's thickness all obviously reduce in the backlight unit to can satisfy the requirement of user to the ultra-thin performance of display module better.
The backlight unit that provides in this embodiment can not only realize super narrow frame, can realize ultra-thin and low cost moreover, can also improve or solve the bright and dark inequality of lamp pearl luminescence surface side simultaneously and be the problem of hotspot and bright band, promotes backlight unit's backlight effect.
The embodiment of the invention also provides a display module which comprises the backlight module in the embodiment.
Through adopting backlight unit in above-mentioned embodiment, can not only realize this display module's super narrow frame, and can realize this display module's ultra-thin and low cost to satisfy user's demand better.
The display module provided by the invention can be any product or component with a display function, such as an LCD panel, an LCD television, a display, a mobile phone, a navigator and the like.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (15)
1. A backlight module comprises a middle region and a frame region;
the backlight module comprises a back plate;
a light bar; the frame area is positioned; the lamp strip comprises a circuit substrate and a lamp bead, and the circuit substrate is electrically connected with the lamp bead;
a reflective sheet; located on the back plate;
a light guide plate; the side of the reflector plate facing away from the back plate; the reflecting sheet and the light guide plate extend from the middle area to the frame area;
the circuit substrate is positioned on one side of the light guide plate, which is far away from the reflector plate;
the light guide plate is characterized in that the light guide plate is uniform in thickness; the light emitting surface of the lamp bead is opposite to the edge end surface of the light guide plate;
the part of the backboard corresponding to the frame area is sunken along the direction far away from the reflector plate to form a first groove;
the orthographic projection of the reflector plate on the back plate is not overlapped with the orthographic projection of the lamp bead on the back plate.
2. The backlight module according to claim 1, wherein the circuit substrate extends along a light-incident side edge of the light guide plate; the number of the lamp beads is multiple, and the lamp beads are arranged at equal intervals along the extending direction of the circuit substrate;
a plurality of bulges are distributed on one side surface of the light guide plate close to the reflector plate; the bulge protrudes towards the direction close to the reflector plate;
in the frame area, the distribution density of the protrusions in the interval area between any two adjacent lamp beads corresponding to the light guide plate is greater than that of the protrusions in the interval area corresponding to the lamp beads corresponding to the light guide plate.
3. The backlight module according to claim 2, further comprising a plastic frame disposed in the first groove and on a side of the bead facing away from the light guide plate;
the rubber frame and the lamp beads are mutually spaced;
the first end of the circuit substrate is bonded with the light guide plate;
the second end of the circuit substrate is bonded with the rubber frame.
4. The backlight module as claimed in claim 3, wherein a first adhesive tape is disposed between the first end and the light guide plate; the first adhesive tape extends along the extending direction of the circuit substrate;
one side of the first adhesive tape, which is far away from the light emitting surface of the lamp bead, is recessed towards the direction close to the light emitting surface of the lamp bead to form a second groove;
the number of the second grooves is multiple, and the second grooves are arranged at equal intervals along the extending direction of the first adhesive tape;
the distribution positions of the second grooves correspond to the distribution positions of the lamp beads one by one.
5. The backlight module according to claim 4, wherein the opening width of the second groove is greater than or equal to the width of the light emitting surface of the lamp bead in the width direction;
the depth of the second groove is smaller than the size of the first adhesive tape in the depth direction;
the depth of the second groove is 0.19-0.39 mm; the first strip has a dimension in the depth direction of 0.45mm or more.
6. The backlight module as claimed in claim 3, wherein a first black film is further disposed on a side of the circuit substrate adjacent to the light guide plate;
the orthographic projection of the first black film on the back plate is coincident with the orthographic projection of the circuit substrate on the back plate.
7. The backlight module according to any one of claims 3-6, further comprising a diffusion sheet on a side of the light guide plate facing away from the reflection sheet;
the diffusion sheet extends from the middle area to the frame area;
the edge of one side of the diffusion sheet close to the light bar is opposite to the first end of the circuit substrate and is spaced from the first end of the circuit substrate;
the backlight module also comprises a second black film which is positioned between the diffusion sheet and the light guide plate, the orthographic projection of the second black film on the back plate is positioned in the frame area, and the second black film extends to a first boundary line from one side edge of the diffusion sheet close to the first end of the circuit substrate to the direction far away from the circuit substrate in a plane parallel to the diffusion sheet;
the distance between the first boundary line and the boundary line of the frame area is more than 0 mm.
8. The backlight module according to claim 7, further comprising an optical processing film layer on a side of the diffusion sheet facing away from the back plate, wherein the optical processing film layer extends from the middle area to the frame area, and an orthographic projection of an edge of the optical processing film layer on the back plate falls within an orthographic projection of the diffusion sheet on the back plate;
the backlight module also comprises shading glue which is positioned on one sides of the circuit substrate and the optical processing film layer, which are far away from the back plate; the orthographic projection of the shading glue on the back plate is superposed with the frame area; the shading glue is attached to the circuit substrate and the optical processing film layer;
the shading glue and the diffusion sheet are bonded through a second adhesive tape; the orthographic projection of the second adhesive tape on the back plate is positioned between the orthographic projection of the optical processing film layer on the back plate and the orthographic projection of the circuit substrate on the back plate, and the orthographic projection of the second adhesive tape on the back plate, the orthographic projection of the optical processing film layer on the back plate and the orthographic projection of the circuit substrate on the back plate are respectively spaced.
9. A backlight module according to any one of claims 1-6, wherein the width of the frame region in a direction away from the middle region is less than or equal to 3.0 mm.
10. The backlight module according to any one of claims 1-6, wherein the depth of the first groove is in the range of 0.05-0.1 mm;
the distance range of one side edge of the reflector plate close to the light emitting surface of the lamp bead and the interval between the light emitting surfaces of the lamp beads is 0.15-0.2 mm.
11. The backlight module according to any one of claims 2-6, wherein the middle region is used for a display region of a display panel, and a sub-pixel array is disposed in the display region;
the distance between the boundary line of the frame area and the edge of one row or one column of sub-pixels of the middle area, which is close to the outermost edge of the frame area, ranges from 0.2mm to 0.3 mm.
12. The backlight module as claimed in claim 7, wherein a distance between an edge of the diffusion sheet close to the light bar and the first end of the circuit substrate is in a range of 0.15mm to 0.2 mm;
the spacing distance between the lamp beads and the rubber frame ranges from 0.12mm to 0.15 mm;
the width range of the rubber frame along the direction far away from the lamp beads is more than 0.25 mm.
13. The backlight module according to claim 9, wherein the arrangement of the lamp beads satisfies:
△AP＝(S2+E)/(B+C)≥0.456；A≥0.1mm；
wherein Δ AP is the light mixing capability of the frame region; s2 is the distance between the boundary line of the frame area and the line or column of sub-pixels of the middle area close to the outermost edge of the frame area; e is the distance between the light emitting surface of the lamp bead and the boundary line of the frame area where the lamp bead is located; b is the spacing distance between two adjacent lamp beads; c is the distance between the centers of the light emitting surfaces of two adjacent lamp beads; a is the distance between the intersection point of the edge light rays emitted by the two lamp beads with one lamp bead in the middle and the boundary line of the frame area where the lamp beads are located.
14. The backlight module as claimed in claim 10, further comprising a binder for covering the edge surfaces of the back plate, the adhesive frame and the light-shielding adhesive.
15. A display module comprising a display panel and the backlight module of any one of claims 1-14;
the display panel includes a display side and a back side, the display side being opposite the back side; the backlight module is located on the back side of the display panel and used for providing display backlight for the display panel.
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