CN114675450A - Light bar, backlight module and display device - Google Patents
Light bar, backlight module and display device Download PDFInfo
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- CN114675450A CN114675450A CN202210323486.7A CN202210323486A CN114675450A CN 114675450 A CN114675450 A CN 114675450A CN 202210323486 A CN202210323486 A CN 202210323486A CN 114675450 A CN114675450 A CN 114675450A
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
- G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
Abstract
The utility model relates to a show technical field on the whole, particularly, relate to a lamp strip, backlight unit and display device, wherein, the lamp strip includes the base plate and sets up in a plurality of lamp pearls of base plate, a plurality of lamp pearls set up along the length direction slope of income plain noodles, wherein, the long limit extending direction of lamp pearl is alpha with the contained angle of array orientation, 19 alpha is no less than or equal to 32, and the lamp pearl highly be H in light guide plate thickness direction, 2mm is no less than or equal to H and is no less than 3mm, through lamp pearl inclination and height, inject lamp pearl size, avoid the highly be greater than light guide plate thickness of lamp pearl the contained angle alpha within range, adjacent two interval scope is [ P ] between the central point of lamp pearl1‑Pn]And the P value corresponding to any one included angle alpha accords with the following conditions:
the light is mixed before entering the picture display area, so that the problem of uneven brightness of the picture is solved.
Description
Technical Field
The application generally relates to the technical field of display, and particularly relates to a lamp strip, a backlight module and a display device.
Background
Displays have been widely used in various fields, and are indistinguishable from our work, study, and life. Nowadays, the performance demand of the display is higher and higher, and how to create a high-brightness and high-picture quality product with low energy consumption is a great challenge in the display industry. Especially the High Dynamic Range (HDR) standard, which has emerged in recent years, can provide higher brightness, better contrast, color accuracy, and more vivid colors than the Standard Dynamic Range (SDR).
Liquid crystal displays are more and more prone to ultra-thin bezel designs, which may cause the short BM region (BM <6.1) of the liquid crystal module and thus insufficient LED light mixing distance, and finally exhibit Hotspot and other problems on the screen.
Disclosure of Invention
In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
In order to solve the technical problem that the mixed light distance of current LED lamp pearl leads to the screen dark bright uneven inadequately, the main aim at of this application promotes dark space luminance, provides a lamp strip, backlight unit and display device.
In order to achieve the purpose of the invention, the following technical scheme is adopted in the application:
a lamp strip is arranged facing a light incident surface of a light guide plate and comprises a substrate and a plurality of lamp beads arranged on the substrate, wherein the plurality of lamp beads are obliquely arranged along the length direction of the light incident surface;
the included angle between the extending direction of the long edges of the lamp beads and the arrangement direction is alpha, alpha is more than or equal to 19 degrees and less than or equal to 32 degrees, the height of the lamp beads in the thickness direction of the light guide plate is H, H is more than or equal to 2mm and less than or equal to 3mm, and the distance between the central points of two adjacent lamp beads is within the range of the included angle alpha, wherein the range of [ P ] is1-Pn]And the value of the distance P corresponding to any included angle alpha meets the following conditions:
wherein k is the width of the lamp bead and w is the length of the lamp bead.
Furthermore, in some embodiments of the scheme of the application, the gap between two adjacent lamp beads is d, and d is greater than or equal to 0.3mm and less than or equal to 1.1 mm.
Further, in some embodiments of the presently filed version, the gap d is 0.4 mm.
Further, in some embodiments of the present application, the number of the lamp beads is N, and N is a positive integer multiple of 3, 4, 6, and 8.
Further, in some embodiments of the present application, a first direction is perpendicular to the arrangement direction of the lamp beads and parallel to the light emitting surface of the lamp beads, and the lamp beads include a light emitting area and an overlapping area partially overlapping with the adjacent lamp beads in the first direction;
along the first direction, the linear length passing through the light emitting area of the lamp beads is L, and the linear length sequentially passing through the overlapping area of two adjacent lamp beads is LAAnd LBThen L isA+LB＝L。
A backlight module is provided with the lamp strip.
Further, in some embodiments of this application scheme, still include the light guide plate, the light guide plate with the clearance of lamp pearl is M, the light guide plate is towards the ascending length of lamp pearl direction is N, then M is 0.3% N.
Further, in some embodiments of the present application, the lighting device further includes a back plate and a graphite heat conduction layer group mounted on the back plate, and the light bar is connected to the graphite heat conduction layer group;
the graphite heat conduction layer group comprises a release layer, a first adhesive layer, a first heat transfer layer, a second heat transfer layer and a second adhesive layer, the first heat transfer layer wraps the second heat transfer layer, the first adhesive layer and the second adhesive layer are oppositely arranged on two opposite sides of the first heat transfer layer, the release layer is arranged on one side, facing the light bar, of the first adhesive layer, and the second adhesive layer is connected with the back plate;
wherein the heat conduction speed of the first heat transfer layer is greater than that of the second heat transfer layer, and the thickness of the second heat transfer layer is greater than that of the first heat transfer layer.
Further, in some embodiments of the present aspects, the first heat transfer layer comprises a graphite layer and an outer cladding surrounding the graphite layer.
A display device is provided with the backlight module.
According to the technical scheme, the advantages and positive effects of the lamp strip, the backlight module and the display device of the application are as follows:
the utility model provides a lamp strip, backlight unit and display device, wherein display device installs this backlight unit, this lamp strip is installed to backlight unit, the lamp strip sets up towards the income plain noodles of light guide plate, the lamp strip includes the base plate and sets up in a plurality of lamp pearls of base plate, a plurality of lamp pearls set up along the length direction slope of going into the plain noodles, wherein, the long limit extending direction of lamp pearl is alpha with the contained angle of array orientation, 19 alpha is not less than or equal to 19, the lamp pearl is H at the height of light guide plate thickness direction, 2mm is not less than or equal to H and is not greater than 3mm, through lamp pearl inclination and height, inject lamp pearl size, avoid the highly being greater than of lamp pearl to be greater than the light guide plate thickness of lamp pearl contained angle alpha within range, adjacent two the central point of lamp pearl is betweenWith a spacing in the range [ P1-Pn]And the P value corresponding to any included angle alpha is in accordance with:
the size, the center distance and the inclination angle of the lamp beads are combined, light mixing is completed before light rays of the lamp beads enter a picture display area, the problem of uneven brightness of a picture is solved, the value of the corresponding distance P at each inclination angle is within a certain range, light mixing is completed before the light rays contact a light incidence surface, uniform illumination is guaranteed, meanwhile, processing and production of the lamp strip are guided according to the relation among all parameters, and the distance P is adjusted according to the change of the length of the lamp strip, the number of the lamp beads and the number of strings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic diagram of the arrangement and illumination brightness of the existing lamp beads.
Fig. 2 is a schematic view of a partial arrangement of a light bar according to an exemplary embodiment 1.
Fig. 3 is a schematic diagram of a partial arrangement of light bars according to an exemplary embodiment.
Fig. 4 is a schematic view of a single lamp bead illumination model of a lamp strip according to an exemplary embodiment.
Fig. 5 is a schematic diagram illustrating 4010 lamp bead arrangement parameters of a lamp strip according to an exemplary embodiment.
Fig. 6 is a schematic diagram illustrating 4012 lamp bead arrangement parameters of a lamp strip according to an exemplary embodiment.
Fig. 7 is a schematic diagram illustrating lamp strip 4014 lamp bead arrangement parameters according to an exemplary embodiment.
Fig. 8 is a schematic side view illustrating a backlight module according to an exemplary embodiment.
Fig. 9 is a schematic diagram illustrating a graphite thermal layer group of a backlight module according to an exemplary embodiment.
Wherein the reference numerals are as follows:
100-a light guide plate; 200-a back plate; 300-a light bar; 400-graphite heat conducting layer group;
310-a substrate; 320-lamp bead; 330-light emitting area; 340-an overlap region;
410-a release layer; 420-a first glue layer; 430-first heat transfer layer; 440-a second heat transfer layer; 450-a second glue layer;
431-graphite layer; 432-outer cladding.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application are within the scope of the present application without inventive efforts, and therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention but only to represent selected embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Displays have been widely used in various fields, and are indistinguishable from our work, study, and life. Nowadays, the performance demand of the display is higher and higher, and how to produce high brightness and high picture quality products with low energy consumption is a great challenge in the display industry. Especially the High Dynamic Range (HDR) standard, which has emerged in recent years, can provide higher luminance, better contrast, color accuracy, and more vivid colors than the Standard Dynamic Range (SDR).
Liquid crystal displays are more and more prone to ultra-thin bezel designs, which may cause the short BM region (BM <6.1) of the liquid crystal module and thus insufficient LED light mixing distance, and finally exhibit Hotspot and other problems on the screen.
Fig. 1 is a light and shade schematic diagram under the existing lamp bead arrangement mode, as shown in fig. 1, in the conventional process, after the LED lamp beads are subjected to piece making, two adjacent lamp beads have a certain distance, the distance is affected by the industrial batch production process, the non-lamp-bar side black matrix bm (black matrix) region of the existing light-coated film group is narrow, the light mixing distance is short, and poor pictures are prone to occur due to uneven light and shade (Hotspot) if a lamp bar is placed.
Referring to the actual picture effect of the existing display device, when a/P is less than 0.558, the picture hotspot can not be improved again by optimizing the dots of the light guide plate, wherein a represents the distance from the light emitting surface of the lamp bead to the edge of an operable Area (Active Area) of the screen, and P represents the distance between the central points of two adjacent lamp beads. Considering the lamp bead component limit distance, taking the use of the conventional 4014 lamp bead limit center point distance of 4.3mm as an example, when BM <6.1mm, the conventional design mode cannot solve the picture Htospot problem.
Therefore, in order to solve the technical problem that the mixed light distance of the existing LED lamp beads 320 is insufficient to cause the dark and uneven brightness of the screen, the main objective of the present application is to improve the brightness of the dark area, the light bar 300 is provided, the backlight module and the display device are provided, wherein the display device is provided with the backlight module, the backlight module is provided with the light bar 300, the light bar 300 is arranged towards the light incident surface of the light guide plate 100, the light bar 300 comprises a substrate 310 and a plurality of lamp beads 320 arranged on the substrate 310, the plurality of lamp beads 320 are obliquely arranged along the length direction of the light incident surface, wherein the included angle between the long edge extending direction of the lamp beads 320 and the arrangement direction is alpha, the included angle between 19 degrees and alpha degrees is not more than 32 degrees, the height of the lamp beads 320 in the thickness direction of the light guide plate 100 is H, the H is not more than 2mm and not more than 3mm, the size of the lamp beads 320 is limited by the inclination angle and the height of the lamp beads, the height of the lamp beads 320 is not more than the thickness of the light guide plate 100, the included angle is avoided that the height of the lamp beads 320 is larger than the thickness of the included angleWithin the range of alpha, the distance between the central points of two adjacent lamp beads is [ P ]1-Pn]And the P value corresponding to any included angle alpha is in accordance with:
k is the width of lamp pearl 320, w is the length of lamp pearl 320, this application scheme combines the size of lamp pearl 320, interaxial distance and the three direction in inclination, makes the light of lamp pearl accomplish the mixed light before getting into the picture display area to improve the uneven problem of picture light and shade, the interval P value that corresponds under each inclination is in certain extent, on the basis of guaranteeing even illumination, guide the processing production of lamp strip, with the change adjustment interval P according to lamp strip length, lamp pearl quantity and cluster number.
The lamp pearl 320 in the scheme of this application is LED lamp pearl 320.
Fig. 1 is a schematic diagram of arrangement and illumination brightness of conventional lamp beads 320. Fig. 2 is a schematic diagram of a partial arrangement of a light bar 300 according to an exemplary embodiment. Fig. 3 is a schematic diagram of a partial arrangement of a light bar 300 according to an exemplary embodiment. Fig. 4 is a schematic view of an illumination model of a single lamp bead 320 of a lamp strip 300 according to an exemplary embodiment. Fig. 5 is a schematic diagram illustrating arrangement parameters of 4010 lamp beads 320 of a light bar 300 according to an exemplary embodiment. Fig. 6 is a schematic diagram illustrating arrangement parameters of 4012 lamp beads 320 of a lamp strip 300 according to an exemplary embodiment. Fig. 7 is a schematic diagram illustrating arrangement parameters of 4014 lamp beads 320 of a light bar 300 according to an exemplary embodiment. Fig. 8 is a schematic side view of a backlight module according to an exemplary embodiment. Fig. 9 is a schematic diagram illustrating a graphite thermal layer group 400 of a backlight module according to an exemplary embodiment.
Referring to fig. 2 to 9, the present application provides a light bar 300, a backlight module and a display device, wherein the display device is provided with the backlight module, and the backlight module is provided with the light bar 300.
Wherein, backlight unit still includes light guide plate 100, backplate 200 and graphite heat-conducting layer, and light guide plate 100 is installed in backplate 200, sets up lamp strip 300 respectively on two long avris, two short avris and each one side of long minor face of light guide plate 100, and light guide plate 100 forms the L type income light form of two minor faces income light, two long edges income light and long minor face, aims at realizing the demand of hi-lite with lower LED electric current, guarantees lower backlight unit temperature simultaneously.
The backlight module is vibrated, and the lamp beads 320 and the light guide plate 100(LGP) are easily worn and scratched. The light guide plate 100 powder that wearing and tearing produced falls into the bowl cup of lamp pearl 320, can lead to the colour of lamp pearl 320 emergent light to change, and then arouse the picture bad, if the picture yellows, backlight unit is in the high temperature and high humidity environment simultaneously, light guide plate 100 receives the environmental impact can take place the inflation, after extrusion both sides lamp strip 300, lead to the exposure lamp, the picture yellows, phenomenon such as Hotspot, still easily arouse the backlight unit fold, in order to solve above-mentioned problem, the backlight unit of this application scheme has adopted the location to light guide plate 100 fixed, reserve space and graphite heat-conducting layer.
Under the condition that lamp strip 300 is arranged on the two short sides, a mode that a silica gel cushion block and a riveting column are combined for positioning is adopted, rigid fixation is carried out by utilizing one riveting column at the center of the ground side of the backlight module, the gap between the light guide plate 100 and the lamp strip 300 on the left short side and the right short side is ensured to be consistent, the silica gel cushion block is used on the top side of the light guide plate 100 for soft fixation, the light guide plate 100 is ensured not to displace in an auxiliary mode, and a sufficient expansion space is provided.
This application scheme combines 320 inclination of lamp pearl and 320 sizes of lamp pearl, light guide plate 100 thickness design is 3mm, light guide plate 100 dead weight is heavier, can produce the impact force during vibrations bigger, set up under the condition of lamp strip 300 at two long avris, light guide plate 100's day side both ends set up the rivet, the stopper is filled at ground side both ends, set up two or more silica gel cushion blocks at two short avris interval respectively, the silica gel cushion block can also provide certain expansion space when reducing light guide plate 100 and rocking. The two ends of the light guide plate 100 in the length direction of the top side are respectively provided with a groove for installing a rivet, the gap between the rivet and the light guide plate 100 in the long edge direction is 0.8mm-1.5mm, the gap below 27 inches of the light guide plate 100 is preferably 1mm, the gap above 27 inches of the light guide plate 100 is preferably 1.2mm, the expansion space of the light guide plate 100 is insufficient when the gap is too small, and the distribution of the lamp beads 320 is influenced when the gap is too large. The gap between the rivet and the light guide plate 100 in the short side direction is 0.1mm-0.2mm, preferably 0.15mm, and when the gap is too small, foreign matters are easily rubbed, and when the gap is too large, the light guide plate 100 has large moving amount and insufficient fixation. The distance between the groove and the operable area (AA) in the extending direction of the short side of the light guide plate 100 is greater than 0.6mm, preferably 0.8mm, and light leakage is likely to occur when the distance is too small. The gap between the plug and the light guide plate 100 in the short edge extending direction is 0.05mm, the gap is too large, the movement of the light guide plate 100 is large and insufficient, the gap is too small, the expansion space of the light guide plate 100 is insufficient, and the assembly is difficult. The clearance of silica gel cushion and light guide plate 100 is 0.2mm, and the clearance is too big to lead to the big fixed not abundant of light guide plate 100 activity, and the clearance undersize leads to light guide plate 100 inflation space not enough, and the equipment is difficult.
In the case where the light bars 300 are provided on the respective sides of the long and short sides, the light guide plate 100 may be expanded to the side without the light bars 300 in both the horizontal direction and the vertical direction. Therefore, it is not necessary to use a rivet column for rigid fixation, and only a plug of a reasonable height is used to avoid the abrasion of the light guide plate 100. Therefore, this application selects to use the silica gel cushion to fix light guide plate 100 in the both sides of no lamp strip 300.
In the present application, a gap between the light guide plate 100 and the lamp bead 320 is M, a length of the light guide plate 100 in a direction toward the lamp bead 320 is N, and then M is 0.3% N, specifically, when the lamp strip 300 is located at two short sides of the light guide plate 100, a direction of the light guide plate 100 toward the lamp bead 320 is a long side extending direction of the light guide plate 100, at this time N is a long side length of the light guide plate 100, and the gap M is 0.3% of the long side length of the light guide plate 100; when the light bar 300 is located on two long sides of the light guide plate 100, the direction of the light guide plate 100 toward the light bead is the short side extension direction, N is the short side length of the light guide plate 100, and the gap M is 0.3% of the short side length of the light guide plate 100, so that the light guide plate 100 is ensured to have a sufficient expansion space in a use environment.
Referring to fig. 2, 8 and 9, a graphite heat conduction layer group 400 is disposed between the light bar 300 and the back plate 200, the graphite heat conduction layer group 400 is installed on the back plate 200, the light bar 300 is connected to the graphite heat conduction layer group 400, the graphite heat conduction layer group 400 includes a release layer 410, a first adhesive layer 420, a first heat transfer layer 430, a second heat transfer layer 440 and a second adhesive layer 450, the first heat transfer layer 430 wraps the second heat transfer layer 440, the first adhesive layer 420 and the second adhesive layer 450 are disposed on opposite sides of the first heat transfer layer 430, the release layer 410 is disposed on one side of the first adhesive layer 420 facing the light bar 300, the second adhesive layer 450 is connected to the back plate 200, the heat conduction speed of the first heat transfer layer 430 is greater than that of the second heat transfer layer 440, the thickness of the second heat transfer layer 440 is greater than that of the first heat transfer layer 430, and the first heat transfer layer 430 includes a graphite layer 431 and an outer cladding layer 432 wrapping the graphite layer 431.
In a specific example, the first heat transfer layer 430 of the second heat transfer layer 440 facing to the side of the light bar 300 can quickly transfer heat of the light bar 300 and transfer the heat of the light bar 300 to the second heat transfer layer 440, and after the thickness of the second heat transfer layer 440 is smaller than that of the first heat transfer layer 430, the heat transfer speed is slower than that of the first heat transfer layer 430, so that the second heat transfer layer 440 has a heat storage function to some extent, the specific heat capacity of the graphite heat conduction layer group 400 is enhanced, and the graphite heat conduction layer group 400 is prevented from being heated up too fast, the first heat transfer layer 430 of the second heat transfer layer 440 facing to the side of the backboard 200 can quickly transfer heat to the backboard 200, and the heat transfer speed from the second heat transfer layer 440 to the backboard 200 is enhanced. In this application scheme, first glue film 420 and second glue film 450 can adopt the double faced adhesive tape respectively, and first heat transfer layer 430 is PET single face glue film, graphite layer 431, PET sticky tape and hot melt adhesive layer by the quadruple composition in proper order, and wherein hot melt adhesive layer laminating second heat transfer layer 440, second heat transfer layer 440 can adopt the cotton core of PU bubble, and in this application scheme, PET single face glue film, PET sticky tape and hot melt adhesive layer are collectively referred to as surrounding layer 432.
Wrap up graphite in the cotton core of bubble, apply to upper and lower two sides with the double faced adhesive tape subsides again, this structure not only can replace the heat-conducting adhesive of lamp strip 300, improves the module and just inverts the luminance difference, can also conduct the heat that lamp strip 300 produced to backplate 200 fast with the help of the outstanding thermal conductivity of graphite. According to the actual measurement result, the temperature of the back plate 200 can be reduced by 2-4 ℃ by the graphite heat conduction layer group 400.
In other embodiments, graphite is mixed into the spray coating and sprayed directly onto the backplate 200 by a spraying technique, and after curing, the continuous graphite layer 431 can be formed on the backplate 200 to assist the backplate 200 in dissipating heat. According to the actual measurement result, the larger the spraying area is, the better the cooling effect is, the maximum thickness of the graphite layer 431 which can be prepared by graphite spraying is 30um, and the temperature of the backboard 200 can be reduced by about 5-6 ℃. Graphene with different layers can be pressed into graphite sheets with different thicknesses, and double faced adhesive tapes are coated on the surfaces of the graphite sheets to prepare the graphite sheets for auxiliary heat dissipation on the back panel 200. The graphite flake heat dissipation principle is the same with graphite spraying, but its thickness can accomplish 100 ~ 300um, is more than 3 times of graphite spraying, consequently more is showing than the cooling effect of graphite spraying. According to the actual measurement result, the temperature of the backboard 200 can be reduced by about 10 ℃. The graphite sheet can reduce the temperature of the backplate 200 due to its excellent heat conducting property, and the heat conductivity is 3-8 times that of aluminum.
Since the graphite heat-conducting layer group 400 is arranged between the light bar 300 and the back plate 200, when the product is upright, the graphite heat-conducting layer group 400 is synchronously compressed by the light guide plate 100 and the light bar 300, and the light guide plate 100 is tightly attached to the light bar 300, so that the light incidence efficiency is ensured; when the product is inverted, the graphite heat-conducting layer group 400 is not stressed to recover to the original shape, the light bar 300 can synchronously move with the light guide plate 100, the light bar 300 and the light guide plate 100 still keep a close-fitting state, the light incidence efficiency is ensured to be unchanged, and the light incidence efficiency can also be ensured.
In the embodiment of the application, lamp strip 300 sets up towards the income plain noodles of light guide plate 100, and lamp strip 300 includes base plate 310 and locates a plurality of lamp pearls 320 of base plate 310, and a plurality of lamp pearls 320 arrange the setting along the length direction slope of income plain noodles, realize the illuminance stack of two lamp pearls 320 to promote dark space luminance.
As shown in fig. 3, under the condition that the brightness of each point on the lamp beads 320 is uniform and the brightness of the emergent light in each direction is consistent, the vertexes of two adjacent lamp beads 320 can be placed on one vertical line, so that the brightness of any vertical line in the overlapping area 340 is equal. Namely, the first direction is set to be vertical to the arrangement direction of the lamp beads and parallel to the light outlet surface of the lamp beads, the lamp beads comprise light outlet areas and overlapped areas partially overlapped with the adjacent lamp beads in the first direction, wherein along the first direction, the length of a straight line passing through the light outlet areas of the lamp beads is L, and the length of a straight line sequentially passing through the overlapped areas of the two adjacent lamp beads is LAAnd LBThen L isA+LB＝L。
In the scheme of the application, the method comprises the following steps of,the included angle between the extending direction of the long edges of the lamp beads 320 and the arrangement direction is alpha, alpha is more than or equal to 19 degrees and less than or equal to 32 degrees, the height of the lamp beads 320 in the thickness direction of the light guide plate 100 is H, H is more than or equal to 2mm and less than or equal to 3mm, and the distance between the central points of two corresponding adjacent lamp beads 320 is [ P ] within the range of the inclination angle alpha1、P2、P3、P4、P5、P6……Pn]And the P value corresponding to any included angle alpha satisfies the following conditions:
k is the width of lamp pearl 320, and w is the length of lamp pearl 320, and the interval P value that corresponds under each inclination is in certain extent, on the basis of guaranteeing even illumination, guides the processing production of lamp strip to change adjustment interval P according to lamp strip length, lamp pearl quantity and cluster number. The gap between two adjacent lamp beads 320 is d, d is more than or equal to 0.3mm and less than or equal to 1.1mm, and the preferred gap d is 0.4 mm.
In this application scheme, interval P has maximum value and minimum, and in interval P value range, lamp pearl 320 exists overlapping and not overlapping two kinds of circumstances, through each parameter restriction of this application, when two adjacent lamp pearls 320 do not overlap, still can realize that light accomplishes the mixed light before contacting the light incident surface.
In combination with the size of the light guide plate 100 and the serial connection of the lamp beads 320, the number of the lamp beads 320 is N, and N is a positive integer multiple of 3, 4, 6 and 8.
Referring to fig. 5-7, taking 4010 lamp bead 320, 4012 lamp bead 320 and 4014 lamp bead 320 as an example, the lamp bead 320 has an overlapped region 340 and a non-overlapped region 340, the non-overlapped region 340 is defined as a light emitting region 330, the uneven brightness of the screen is improved, the inclination angle a of the 4010 lamp bead 320 is 19-32 °, the vertex angle interval H is 2.24-2.96 mm, the interval d is 0.33-1.07 mm, and the interval is 3.9-4.10 mm, namely P1Is 3.9mm, PnIs 4.10 mm. 4012 lamp bead 320 has an inclination angle a of 22 ° -29 °, lamp bead 320 height (vertex angle spacing) in the thickness direction of light guide plate 100 of 2.61mm-2.98mm, spacing d of 0.35mm-0.77mm, and spacing of 4.08mm-4.15 mm. 4014 lamp bead 320: the inclination angle a is 24-2The vertical angle is 5 degrees, the vertex angle distance H is 2.90mm-2.95mm, the distance d is 0.31mm-0.38mm, and the distance d is 4.21mm-4.22 mm.
With reference to fig. 5, when the inclination angle α of the 4010 lamp bead is 25 °, k is 1mm, w is 4mm, the corresponding pitch P is 4.0478mm, and the P value corresponding to any included angle α satisfies:
(1)
(2)
(3)4.123-cos11°-0.4226≤P≤4.123*cos11°+0.3
(4)4.123-0.981-0.4226≤P≤4.123*0.981+0.3
(5)2.7149≤P≤4.3446
thus, P is 4.0478, within the range of values of P corresponding to an inclination of 25 °.
The inclination angle of the lamp bead 320 is too large, the height of the lamp bead 320 in the thickness direction of the light guide plate 100 is higher than the thickness of the light guide plate 100, and the height of the lamp bead 320 in the thickness direction of the light guide plate 100 is preferably 2.4mm-2.6 mm. The inclination angle of the lamp beads 320 is too small, so that the overlapping area 340 of the lamp beads 320 is too small, even two adjacent lamp beads 320 cannot be overlapped, the distance between the central points of the two adjacent lamp beads 320 is too large, the lamp beads 320 are placed horizontally, and the inclined arrangement is meaningless.
Further, HDR1000 requires highly to liquid crystal display module luminance, if realize with current backlight design scheme, too big current can lead to whole module high temperature, and this embodiment is with two lamp strips 300 designs, includes that two minor faces go into light, two long limit income light and L type go into light promptly, realizes the demand of hi-lite with lower LED current, guarantees lower module temperature simultaneously. At present, the liquid crystal display adopts an ultra-narrow frame design, and under the condition that the BM area is narrow, in order to ensure the illumination uniformity of the lamp bead 320 overlapping area 340, the problem of uneven brightness of the light guide plate 100 is solved, the size, the center distance and the three directions of the inclination angle of the lamp bead 320 are combined, and under the understanding of the technical personnel in the field, the support of the lamp bead 320 can be set to be made of transparent materials to improve the picture quality. In the dual-edge light structure, a positioning design of the light guide plate 100 is added to prevent some defects that may be caused by shaking and expansion of the light guide plate 100. To achieve high brightness, the LEDs need to be driven with a large current, and the temperature of the backplate 200 is high. Three different graphite schemes are used to cool the backplate 200, ensuring that the temperature of the backplate 200 is within the normal working range under high brightness.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the general inventive concept. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A lamp strip is arranged facing a light incident surface of a light guide plate and is characterized by comprising a substrate and a plurality of lamp beads arranged on the substrate, wherein the plurality of lamp beads are obliquely arranged along the length direction of the light incident surface;
the included angle between the extending direction of the long edges of the lamp beads and the arrangement direction is alpha, alpha is more than or equal to 19 degrees and less than or equal to 32 degrees, the height of the lamp beads in the thickness direction of the light guide plate is H, H is more than or equal to 2mm and less than or equal to 3mm, and the distance between the central points of two adjacent lamp beads is within the range of the included angle alpha, wherein the range of [ P ] is1-Pn]And the value of the distance P corresponding to any included angle alpha meets the following requirements:
wherein k is the width of the lamp bead and w is the length of the lamp bead.
2. The light bar of claim 1, wherein the gap between two adjacent light beads is d, and d is more than or equal to 0.3mm and less than or equal to 1.1 mm.
3. A light bar as defined in claim 2, wherein the gap d is 0.4 mm.
4. The light bar of any one of claims 1 to 3, wherein the number of the light beads is N, and N is a positive integer multiple of 3, 4, 6 and 8.
5. The light bar of claim 1, wherein a first direction is perpendicular to the arrangement direction of the light beads and parallel to the light emitting surface of the light beads, and the light beads comprise a light emitting area and an overlapping area partially overlapping with the adjacent light beads in the first direction;
wherein along a first direction, the linear length passing through the light-emitting area of the lamp beads is L, and the linear length sequentially passing through the overlapping area of two adjacent lamp beads is LAAnd LBThen L isA+LB＝L。
6. A backlight module characterized in that the light bar of any one of claims 1 to 5 is installed.
7. The backlight module as claimed in claim 6, further comprising a light guide plate, wherein a gap between the light guide plate and the lamp beads is M, and a length of the light guide plate in a direction toward the lamp beads is N, where M is 0.3% N.
8. The backlight module of claim 6, further comprising a back plate and a graphite heat conducting layer set mounted on the back plate, wherein the light bar is connected to the graphite heat conducting layer set;
the graphite heat conduction layer group comprises a release layer, a first adhesive layer, a first heat transfer layer, a second heat transfer layer and a second adhesive layer, the first heat transfer layer wraps the second heat transfer layer, the first adhesive layer and the second adhesive layer are oppositely arranged on two opposite sides of the first heat transfer layer, the release layer is arranged on one side, facing the lamp strip, of the first adhesive layer, and the second adhesive layer is connected with the back plate;
wherein the heat conduction speed of the first heat transfer layer is greater than that of the second heat transfer layer, and the thickness of the second heat transfer layer is greater than that of the first heat transfer layer.
9. The backlight module of claim 8, wherein the first heat transfer layer comprises a graphite layer and an outer cladding layer surrounding the graphite layer.
10. A display device characterized in that the backlight module according to any one of claims 6 to 9 is mounted.
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