CN109445187A - A kind of backlight module and display device - Google Patents

A kind of backlight module and display device Download PDF

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Publication number
CN109445187A
CN109445187A CN201811595180.7A CN201811595180A CN109445187A CN 109445187 A CN109445187 A CN 109445187A CN 201811595180 A CN201811595180 A CN 201811595180A CN 109445187 A CN109445187 A CN 109445187A
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CN
China
Prior art keywords
light
light emitting
emitting diode
protrusion
guide plate
Prior art date
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Pending
Application number
CN201811595180.7A
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Chinese (zh)
Inventor
郑斌义
杨雁
王海亮
沈柏平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xiamen Tianma Microelectronics Co Ltd
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Xiamen Tianma Microelectronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Xiamen Tianma Microelectronics Co Ltd filed Critical Xiamen Tianma Microelectronics Co Ltd
Priority to CN201811595180.7A priority Critical patent/CN109445187A/en
Publication of CN109445187A publication Critical patent/CN109445187A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133615Edge-illuminating devices, i.e. illuminating from the side
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0035Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/005Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055Reflecting element, sheet or layer

Abstract

The invention discloses a kind of backlight module and display devices, the backlight module is down straight aphototropism mode set, including light guide plate and light emitting source, wherein, light emitting source includes multiple light emitting diodes, light guide plate has that opposite light emitting diode accommodation groove, light emitting diode accommodation groove are sheathed on the outside of light emitting diode one by one with light emitting diode, and the bottom wall of light emitting diode accommodation groove has the protrusion towards light emitting diode.The uniformity that display module shows light can be improved in the application, weakens display module " babysbreath " defect, improves display effect.In addition, the light in the region between two neighboring light emitting diode is enhanced in the embodiment of the invention, therefore, the spacing between light emitting diode can be made to be arranged larger, so as to reduce the dosage of light emitting diode, reduce the cost of display module.

Description

A kind of backlight module and display device
Technical field
The present invention relates to field of display technology, more particularly to a kind of backlight module and display device.
Background technique
HDR (High-Dynamic Range, high dynamic range images) generally refers to the very wide figure of display brightness range Picture, people will usually make and the technology of display high dynamic range images is known as HDR technology.Making and showing high dynamic range It is most important to seek to make image that there is enough brightness, and the brightness grayscale with higher of image when image.
Currently, HDR (High-Dynamic Range, high dynamic range images) technology be applied to liquid crystal display or In the products such as liquid crystal TV set, image quality can be greatly promoted.But in order to fully play the advantage of HDR, to liquid crystal Higher requirements are also raised for the backlight module of display device.Since straight-down negative can adjust display dress by control backlight The display picture set, display effect are preferable.
In the prior art, a kind of backlight of straight-down negative display device uses grade light-emitting diode chip for backlight unit (mini LED), and in order to improve display effect, it is necessary to more, comparatively dense mini LED be arranged, while also having led to display dress The power consumption set is larger and higher cost;In order to reduce the energy consumption and cost of display device, it is desirable to which mini LED to be arranged More sparse, i.e., the distance between two neighboring mini is larger, then is easy to cause display panel " babysbreath " problem more obvious, That is, the light in the region among two adjacent LEDs is weaker as shown in Figure 1, stronger with the light in the region of LED face, And the degree of strength difference of the two is more obvious.
Summary of the invention
The purpose of the embodiment of the present invention is that provide a kind of backlight module and display device, with weaken light emitting source face region with The light gap in the region between light emitting source improves the uniformity that display module shows light, weakens display module " babysbreath " Defect improves display effect, reduces the cost of display module.
Backlight module provided by the embodiment of the present invention, the backlight module be down straight aphototropism mode set, including light guide plate and Light emitting source, wherein the light emitting source includes multiple light emitting diodes, and the light guide plate has opposite one by one with light emitting diode Light emitting diode accommodation groove, the light emitting diode accommodation groove are sheathed on the outside of the light emitting diode, the light-emitting diodes The bottom wall of pipe accommodation groove has the protrusion towards the light emitting diode.
In further technical solution, the light guide plate is away from light-emitting surface and the surface parallel with the light-emitting surface is provided with High reflection layer.
There is one to shine in further technical solution, in the middle part of the bottom wall of the light emitting diode accommodation groove towards described The protrusion of diode, along light guide plate light-emitting surface direction is parallel to, the protrusion is small close to the area of section of the light emitting diode In the area of section of the protrusion far from the light emitting diode.
In optional technical solution, the protrusion is conic convex, pyramid protrusion, rotary table protrusion, terrace with edge protrusion, multilayer circle Platform stacks the protrusion to be formed, multilayer terrace with edge stacks one of the protrusion to be formed or hemisphere protrusion.
In further technical solution, along being parallel to light guide plate light-emitting surface direction, the cross sectional shape of the protrusion with it is described The cross sectional shape of light emitting diode is identical.
In further technical solution, the protrusion is straight conic convex, and the apex angle α of the straight conic convex meets: α≤ 101.6°。
In further technical solution, the light-emitting surface of the light guide plate has and the one-to-one net of the light emitting diode Point group, the site group reduce along the distribution density far from corresponding light emitting diode direction site.
In specific technical solution, the network point distribution is in the side annular section of the light emitting diode accommodation groove.
In further technical solution, the light guide plate light-emitting surface is provided with fluorescent film or the light emitting diode Peripheral side is covered with fluorescent film.
In optional technical solution, the high reflection layer includes metal high reflection layer, oxide high reflection layer or organic Object high reflection layer.
In the embodiment of the present invention, backlight module is down straight aphototropism mode set, and in the embodiment, light guide plate has light-emitting diode Pipe accommodation groove, the light that light emitting diode issues is projected through the inner wall of light emitting diode accommodation groove, from light emitting diode accommodation groove The light that side wall projects can enter region of the light guide plate between two neighboring light emitting diode, can increase adjacent hair The light intensity in the region between optical diode;Further, the bottom wall of light emitting diode accommodation groove has towards light-emitting diodes The protrusion of pipe, the side wall that a part further encounters above-mentioned protrusion in the light of light emitting diode reflect, hence into leading Region of the tabula rasa between two neighboring light emitting diode can further increase the area between adjacent light emitting diode The light intensity in domain, and the light projected from face LED area can be reduced to a certain extent, to weaken hair The light gap in the region between light source face region and light emitting source improves the uniformity that display module shows light, weakens aobvious Show mould group " babysbreath " defect, improves display effect.In addition, in the embodiment of the invention, between two neighboring light emitting diode The light in region enhanced, therefore, the spacing between light emitting diode can be made to be arranged larger, so as to reduce The dosage of light emitting diode reduces the cost of display module.
The embodiment of the invention also provides a kind of display device, which includes the back in any of the above-described technical solution The case where display light of optical mode group, the display device is more uniform, babysbreath is less, and display effect is preferable, and can carry on the back Less light emitting diode is arranged in optical mode group, to reduce cost.
Detailed description of the invention
Fig. 1 is the backlight module cross section structure schematic diagram of an embodiment of the prior art;
Fig. 2 is the cross section structure schematic diagram of one embodiment of the invention backlight module;
Fig. 3 is the light intensity of one embodiment of the invention light emitting diode and the relational graph of position;
Fig. 4 is the structural schematic diagram of pyramid protrusion;
Fig. 5 is the structural schematic diagram of rotary table protrusion;
Fig. 6 is the structural schematic diagram that multilayer rotary table stacks the protrusion to be formed;
Fig. 7 is the structural schematic diagram of hemisphere protrusion;
Fig. 8 is the structural schematic diagram of conic convex;
Fig. 9 is the relational graph of light emitting diode and bulge-structure in one embodiment of the invention;
Figure 10 is the relational graph of light emitting diode and bulge-structure in one embodiment of the invention;
Figure 11 is one embodiment of the invention backlight module top view;
Figure 12 is the cross section structure schematic diagram of one embodiment of the invention backlight module;
Figure 13 is the cross section structure schematic diagram of one embodiment of the invention backlight module;
Figure 14 is the cross section structure schematic diagram of one embodiment of the invention backlight module;
Figure 15 is the display device structure schematic diagram of one embodiment of the invention.
Appended drawing reference:
Prior art part:
01-LED;
Part of the present invention:
1- light guide plate;
11- light emitting diode accommodation groove;
111- protrusion;
12- light-emitting surface;
The site 13- group;
The site 131-;
2- light emitting diode;
3- high reflection layer;
4- substrate;
5- diffusion sheet;
6- brightening piece;
7- fluorescent film;
100- display device;
200- backlight module.
Specific embodiment
For the light gap for weakening the region between light emitting source face region and light emitting source, improves display module and show light Uniformity, weaken display module " babysbreath " defect, improve display effect, reduce the cost of display module, the present invention is implemented Example provides a kind of backlight module and display device.To make the object, technical solutions and advantages of the present invention clearer, it lifts below Invention is further described in detail for embodiment.
As shown in Fig. 2, backlight module provided in an embodiment of the present invention, which is down straight aphototropism mode set, including Light guide plate 1 and light emitting source, wherein light emitting source includes multiple light emitting diodes 2, and light guide plate 1 has and the phase one by one of light emitting diode 2 Pair light emitting diode accommodation groove 11, light emitting diode accommodation groove 11 is sheathed on the outside of light emitting diode 2, light-emitting diodes tube capacity The bottom wall of slot 11 is set with the protrusion 111 towards light emitting diode 2.
As shown in figure 3, wherein light emitting angle refers to for the luminous subtended angle width distribution figure of light emitting diode 2 in an embodiment , with 2 direct projection angle of light emitting diode for 0 degree, the drift angle of left side and the axis is negative value, and right side and the drift angle of the axis are Positive value.It can calculate and obtain from figure, for angle within the scope of ± 15 °, the ratio that brightness accounts for total brightness is 20%;Angle ± Within the scope of 20 °, the ratio that brightness accounts for total brightness is 26%;Within the scope of ± 40 °, the ratio that brightness accounts for total brightness is angle 52%;Specifically, the ratio calculation principle of brightness total shared by the above-mentioned brightness calculated within the scope of set angle are as follows: respective corners The area in the region that light intensity curve and corresponding X-axis in degree range surround, the face in the region surrounded with total light intensity curve and X-axis Long-pending ratio.Therefore, light emitting diode 2, which emits beam, is concentrated mainly on angle within the scope of ± 40 °, and the angular range is smaller, Therefore the light intensity that the display module only close to light emitting diode center position issues is larger, and far from light emitting diode 2 Zonal ray intensity it is smaller.Therefore, in existing display module, with the zonal ray intensity of 2 face of light emitting diode with it is separate The zonal ray intensity difference of light emitting diode is more, is easy to cause display panel a large amount of visible bright spot occur, that is, expires The defect of TianXing.
In the embodiment of the present invention, backlight module is down straight aphototropism mode set, in the embodiment, is set in the substrate of backlight module A large amount of light emitting diode is set as light emitting source, in side setting light guide plate of the light emitting source far from substrate with the sending of uniformly light-emitting source Light, for providing backlight for display panel.In the embodiment, light guide plate 1 has Light-Emitting Diode accommodation groove 11, this shines Diode accommodation groove 11 is sheathed on the outside of light emitting diode 2, therefore on the one hand, the light that light emitting diode 2 issues is through luminous two The inner wall of pole pipe accommodation groove 11 projects, and the light projected from 11 side wall of light emitting diode accommodation groove can be directly entered light guide plate 1 Region between two neighboring light emitting diode 2, the light that can increase the region between adjacent light emitting diode 2 are strong Degree;On the other hand, the bottom wall of light emitting diode accommodation groove 11 has the protrusion 111 towards light emitting diode 2, light emitting diode 2 Light in a part further encounter above-mentioned raised 111 side wall and reflect, hence into light guide plate 1 positioned at two neighboring Region between light emitting diode 2 can further increase the light intensity in the region between adjacent light emitting diode 2, And the light projected from 2 region of face light emitting diode can be reduced to a certain extent, that is, weaken light emitting diode face area The light intensity in domain improves to reduce the light intensity gap in the region between 2 face region of light emitting diode and light emitting source Display module shows the uniformity of light, reduces and the case where bright spot occurs in display module display interface, and it is " full to weaken display module TianXing " defect improves display effect.
In addition, the light in the region between two neighboring light emitting diode 2 is enhanced in the embodiment of the invention, Therefore, the spacing between light emitting diode 2 can be made to be arranged larger, so as to reduce the dosage of light emitting diode 2, reduced The cost of display module.
In specific embodiment, the shape and quantity of above-mentioned protrusion are not particularly limited, for example, accommodating in light emitting diode The bottom wall of slot has multiple protrusions, and above-mentioned multiple protrusions can be uniformly distributed, it is of course also possible to include a protrusion or two Protrusion, user reasonably can be designed and be adjusted to scheme according to product characteristic and product demand.
Specifically, light emitting diode can be level led for unencapsulated millimeter, i.e. mini LED in the application, In the prior art, the use of the light emitting diode is easier that above-mentioned " babysbreath " problem is caused therefore to use, can be compared with The display effect of the unencapsulated level led backlight module as light emitting source of millimeter of good raising.
With continued reference to FIG. 2, in further embodiment, light guide plate 1 is away from light-emitting surface 12 and parallel with light-emitting surface 12 Surface is provided with high reflection layer 3.
It is worth noting that backlight module includes the substrate 4 set gradually, light emitting source, light guide plate 1, diffusion sheet 5 and adds lustre to Piece 6 etc., light emitting diode 2 are installed on substrate 4, and the light emitting diode accommodation groove 11 of light guide plate 1 is sheathed on the outer of light emitting diode 2 Side.The light-emitting surface 12 of light guide plate 1 refers to light guide plate 1 towards the surface of diffusion sheet 5, i.e. light guide plate 1 is by surface derived from light As light-emitting surface 12, light guide plate 1 is away from light-emitting surface 12 and the surface parallel with light-emitting surface 12 is that light guide plate 1 and substrate 4 are opposite Surface, it is understood that be, in the surface opposite with light-emitting surface 12 of light guide plate 1 remove light emitting diode accommodation groove 11 table Face.
In the embodiment, deviates from light-emitting surface 12 in light guide plate 1 and the surface parallel with light-emitting surface 12 is provided with high reflection layer 3, when light guide plate 1 conducts, the light for being mapped to 1 light-emitting surface 12 of light guide plate directly projects light, is mapped to light guide plate 1 and light-emitting surface 12 When removing the surface of light emitting diode accommodation groove 11 in opposite surface, light guide plate 1 is re-introduced into after the reflection of high reflection layer 3 It is projected later from 1 light-emitting surface 12 of light guide plate, can be improved the light utilization of backlight module, and the light by reflection can be from Region between light emitting diode 2 is projected, to improve the light intensity of above-mentioned zone, and can further reduce luminous two The quantity of pole pipe 2, reduces cost.
In specific embodiment, the material of high reflection layer 3 is unlimited, for example, can be high anti-for metal high reflection layer, oxide Penetrate layer or organic matter high reflection layer.The considerations of according to product demand and cost etc., selects suitable material high reflection Layer is used as high reflection layer 3.
With continued reference to FIG. 2, in further embodiment there is a court in the middle part of the bottom wall of light emitting diode accommodation groove 11 To the protrusion 111 of light emitting diode 2, along 1 light-emitting surface of light guide plate, 12 direction is parallel to, protrusion 111 is cut close to light emitting diode 2 Face area is less than raised 111 areas of section far from light emitting diode 2.
In the embodiment, the bottom wall of light emitting diode accommodation groove 11 only has a protrusion 111, and the protrusion 111 is along remote Direction size from light emitting diode 2 reduces, and therefore, the outer surface of protrusion 111 can be formed towards the oblique of light emitting diode 2 Face, the light of light emitting diode 2 are mapped to after the inclined-plane of protrusion 111, some light reflects, and reflexes to enter and lead Region of the tabula rasa 1 between two neighboring light emitting diode 2 and the light after reflection are tilted towards light-emitting surface 12 to be projected, because This, can further improve the light intensity in region of the light guide plate 1 between two neighboring light emitting diode 2, be conducive to The further light gap for weakening the region between light emitting source face region and light emitting source.
In further embodiment, above-mentioned raised 111 axis passes through the center of light emitting diode 2, then light emitting diode 2 The light of sending can more uniformly be dissipated to side, i.e., uniform along the side light intensity of light emitting diode 2, display effect Preferably.
In specific embodiment, above-mentioned raised 111 planform is unlimited, for example, can be convex for conic convex, pyramid It rises, rotary table protrusion, terrace with edge protrusion, multilayer rotary table stacks the protrusion to be formed, multilayer terrace with edge stacks the protrusion to be formed or hemisphere is convex One of rise.Wherein multilayer rotary table stacks the superposition that the protrusion to be formed refers to several sections of rotary tables, specifically, the axis of several sections of rotary tables Line overlap can be specifically designed according to actual needs alternatively, the axis for being also possible to several sections of rotary tables is staggered.Multilayer terrace with edge It stacks the protrusion formed and stacks that the raised structure to be formed is similar, and the cross sectional shape of every layer of terrace with edge can be identical with multilayer rotary table Can be different, for example, every layer of terrace with edge is truncated rectangular pyramids, and the side of each terrace with edge is parallel in a specific embodiment;Another In specific embodiment, in multilayer terrace with edge, including triangular platform, truncated rectangular pyramids and five terrace with edges, the axis overlapping of each terrace with edge.Specifically , Fig. 4 is the structural schematic diagram of pyramid protrusion, and Fig. 5 is the structural schematic diagram of rotary table protrusion, and Fig. 6 is that multilayer rotary table stacks to be formed Protrusion structural schematic diagram, Fig. 7 be hemisphere protrusion structural schematic diagram, Fig. 8 for conic convex structural schematic diagram.It is specific real It applies in example, suitable convex shape can be selected according to actual product demand.
In concrete application, the bulge-structure to be formed is stacked using multilayer rotary table, multilayer rotary table stacks every in the protrusion to be formed Layer rotary table all includes the incidence surface parallel with light-emitting surface 12, and is then sent out with above-mentioned light-emitting surface at the reflecting slant of set angle The light opposite with the above-mentioned incidence surface direct projection parallel with light-emitting surface 12 can be directly entered protrusion and from light out in optical diode 2 Face is projected, and the light opposite with above-mentioned reflecting slant direct projection with some from the reflecting slant can enter protrusion and from light out Face is projected, and another part reflects, to supplement the light intensity of adjacent 2 intermediate region of light emitting diode.In the embodiment, pass through It rationally designs, adjustment multilayer rotary table stacks in the protrusion to be formed, the face of the incidence surface parallel with light-emitting surface 12 and reflecting slant Product, it is adjustable with 2 face position light intensity of light emitting diode and to supplement adjacent 2 intermediate region of light emitting diode Light intensity, so as to further make the light intensity in above-mentioned two region more closely, to prevent due to above-mentioned twoth area Light intensity difference in domain is more, and display screen is caused visible bright spot, i.e. " babysbreath " problem occur.
In specific embodiment, edge is parallel to 1 light-emitting surface of light guide plate, 12 direction, the cross sectional shape of protrusion 111 and luminous two The cross sectional shape of pole pipe 2 is identical.
For example, the cross sectional shape of light emitting diode 2 is circle, then, the cross sectional shape of protrusion 111 is also circle, for example, circle Shape light emitting diode 2 corresponding raised 111 can for conic convex, rotary table protrusion, multilayer rotary table stack the protrusion to be formed or Hemisphere protrusion;Or the cross sectional shape of light emitting diode 2 is rectangle, then, the cross sectional shape of protrusion 111 is also rectangle, and protrusion 111 right angle is opposite with the right angle of light emitting diode 2, for example, rectangular light emitting diode 2 corresponding raised 111 can be pyramid Protrusion, terrace with edge protrusion or multilayer terrace with edge stack the protrusion to be formed.Structure in the embodiment is conducive to the propagation of light, that is, shines The light that diode 2 issues is opposite with raised 111 corresponding reflecting slants, is able to carry out the reflection of equal extent, to improve The uniformity of 2 side light intensity of light emitting diode.
Please refer to Fig. 9 and Figure 10, in further embodiment, protrusion 111 is straight conic convex, the apex angle of straight conic convex α meets: α≤101.6 °.
As shown in Figure 9 and Figure 10, inventor obtains by analysis, when the apex angle α of straight conic convex 111 meets: α≤ At 101.6 °, the light for being directed to straight conic convex can be made to be totally reflected, lead at least direct line A and direct line A is all reflected onto region of the light guide plate 1 between light emitting diode 2 far from the light B of straight conic convex center position, and Another part light C is projected from the region of light emitting diode face, and therefore, the region opposite with light emitting diode 2 of light guide plate 1 is bright It is more to spend reduction degree, and the zonal ray intensity increase between light emitting diode 2 is also more, to be conducive to balance light guide plate The light intensity in the region between 1 and the opposite region and light emitting diode 2 of light emitting diode 2.In the present embodiment, with light guide plate 1 using for common polycarbonate (PC) material, and refractive index takes 1.58, and the apex angle α of above-mentioned straight conic convex is calculated Range.
Specifically, refractive index is n, the incidence angle of light is β, the then occurrence condition being totally reflected are as follows:
β≥arcsin n;
More common light guide panel material is then selected, refractive index n=1.58 sends out to make to face light on the inclined-plane of protrusion Raw total reflection, needs to meet β >=arcsin 1.58, i.e. β >=39.2 °, can further extrapolate θ≤50.8 °, thus α= 2θ≤101.6°.In the embodiment, the light of more separate light emitting diode center can be made to be all-trans and be incident upon two neighboring hair Between optical diode, to balance the region between light guide plate 1 and the opposite region and light emitting diode 2 of light emitting diode 2 There is the case where bright spot to reduce display panel in light intensity.
In further embodiment, Figure 11 is please referred to, the light-emitting surface 12 of light guide plate 1 has a pair of with light emitting diode 2 one The site group 13 answered, site group 13 reduce along the distribution density far from corresponding 2 direction site of light emitting diode.
Figure 12 is please referred to, in the embodiment, the light for being mapped to site 131 can be reflected back in light guide plate 1 by site 131 Portion, and through the light guide plate the high reflection layer 3 of 1 bottom again secondary reflection to from farther away from the region of light emitting diode 2 project, thus The light intensity for enhancing the region far from light emitting diode 2, further, it is also possible to stop the area where a part of light from site group Domain is projected, to reduce the light intensity in the region;To the light intensity of further uniform display panel.Further, Site group 13 reduces along the distribution density far from corresponding 2 direction site 131 of light emitting diode, closer to light emitting diode 2, light Line intensity is bigger, can stop more light using more intensive site 131 and be reflected back more extremely distance luminous two The farther away region of pole pipe 2, so as to the light intensity that light emitting diode 2 issues in display panel that is further averaged, thus The further uniformity for improving display module and showing light, weakens display module " babysbreath " defect, improves display effect.
In specific embodiment, above-mentioned site 131 is distributed in the side annular section of light emitting diode accommodation groove 11.
In the embodiment, the region where site 131 is annular section, and the internal edge of the annular section and shines two The external margin of pole pipe accommodation groove 11 is substantially overlapping, to reflect the light close to light emitting diode week side region, thus It reduces the light intensity in the region and improves the light intensity in the region far from light emitting diode.
The size of above-mentioned annular section is not particularly limited, and can be designed according to the actual situation, is mainly considered adjacent The distance between two light emitting diodes, so that display panel shows that light is uniform.
In general, gradually die down along far from 2 direction light of light emitting diode, therefore, the light warp right above light emitting diode 2 After the protrusion 111 of 11 bottom wall of light emitting diode accommodation groove reflects, it is dispersed a part of light, further, close to luminous two The light in the region of 2 side of pole pipe is reflected through site 131 again, and can be reflected in all directions of light emitting diode 2 Light, so as to the distribution that the side uniformly light-emitting diode 2 in light emitting diode emits beam, to improve light-emitting diodes The luminous uniformity of pipe.
In specific embodiment, the manufacturing process of light guide plate includes: mold injection molding production with light-emitting diodes tube capacity The light conducting plate body of slot is set, and the bottom wall of above-mentioned light emitting diode accommodation groove has protrusion, i.e., above-mentioned protrusion and light guide plate are one Forming structure forms site group in light guide plate light-emitting surface later;Then recycle the mode of coating or sputtering in light guide plate High reflection layer is formed away from the surface of light-emitting surface.
In further embodiment, as shown in figure 13,1 light-emitting surface 12 of light guide plate is provided with fluorescent film 7, alternatively, such as Figure 14 Shown, the peripheral side of light emitting diode 2 is covered with fluorescent film 7.
In the embodiment, by setting fluorescent film 7, the light color of light emitting diode 2 can be made to change, for example, Light emitting diode 2 is blue LED, and after covering fluorescent film 7, the light that backlight module issues can become white light Line, to be used as backlight module.
Figure 15 is please referred to, the embodiment of the invention also provides a kind of display device 100, which includes above-mentioned Backlight module 200 in any technical solution, backlight module 200 can reduce in the embodiment and light emitting diode 2 just aligns Light intensity is set and to supplement the light intensity of adjacent 2 intermediate region of light emitting diode, so as to so that above-mentioned two region Light intensity more closely, more situation is differed due to above-mentioned two zonal rays intensity to reduce, to reduce and shine The case where bright spot, i.e. babysbreath in diode face region, is less.Therefore, the display light of the display device 200 is more uniform, Display effect is preferable, and less light emitting diode 2 can be arranged in backlight module 200, to reduce cost.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies Within, then the present invention is also intended to include these modifications and variations.

Claims (11)

1. a kind of backlight module, which is characterized in that the backlight module be down straight aphototropism mode set, including light guide plate and shine Source, wherein the light emitting source includes multiple light emitting diodes, and the light guide plate has and light emitting diode is opposite one by one shines Diode accommodation groove, the light emitting diode accommodation groove are sheathed on the outside of the light emitting diode, the light-emitting diodes tube capacity The bottom wall of slot is set with the protrusion towards the light emitting diode.
2. backlight module according to claim 1, which is characterized in that the light guide plate away from light-emitting surface and with it is described go out light The parallel surface in face is provided with high reflection layer.
3. backlight module according to claim 2, which is characterized in that tool in the middle part of the bottom wall of the light emitting diode accommodation groove There is a protrusion towards the light emitting diode, along light guide plate light-emitting surface direction is parallel to, the protrusion shines close to described The area of section of diode is less than the area of section of the protrusion far from the light emitting diode.
4. backlight module according to claim 3, which is characterized in that the protrusion is conic convex, pyramid protrusion, rotary table Protrusion, terrace with edge protrusion, multilayer rotary table stacks the protrusion to be formed, multilayer terrace with edge stacks the protrusion to be formed or hemisphere protrusion in one Kind.
5. backlight module according to claim 3, which is characterized in that edge is parallel to light guide plate light-emitting surface direction, described convex The cross sectional shape risen is identical as the cross sectional shape of the light emitting diode.
6. backlight module according to claim 3, which is characterized in that the protrusion is straight conic convex, the straight circular cone The apex angle α of protrusion meets: α≤101.6 °.
7. described in any item backlight modules according to claim 1~6, which is characterized in that the light-emitting surface of the light guide plate has With the one-to-one site group of the light emitting diode, the site group is along point far from corresponding light emitting diode direction site Cloth density reduces.
8. backlight module according to claim 7, which is characterized in that the network point distribution is accommodated in the light emitting diode The side annular section of slot.
9. according to the described in any item backlight modules of claim 2~6, which is characterized in that the light guide plate light-emitting surface is provided with The peripheral side of fluorescent film or the light emitting diode is covered with fluorescent film.
10. backlight module according to claim 2, which is characterized in that the high reflection layer includes metal high reflection layer, oxygen Compound high reflection layer or organic matter high reflection layer.
11. a kind of display device, which is characterized in that including the described in any item backlight modules of such as claim 1~10.
CN201811595180.7A 2018-12-25 2018-12-25 A kind of backlight module and display device Pending CN109445187A (en)

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TWI765554B (en) * 2021-02-01 2022-05-21 云光科技股份有限公司 Backlight device
US11500245B1 (en) 2021-12-30 2022-11-15 Xiamen Tianma Microelectronics Co., Ltd. Backlight module and display device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113835263A (en) * 2020-06-08 2021-12-24 华为技术有限公司 Direct type backlight module, display and terminal equipment
TWI765554B (en) * 2021-02-01 2022-05-21 云光科技股份有限公司 Backlight device
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