CN103926645A - Light guiding plate, backlight module and display device - Google Patents
Light guiding plate, backlight module and display device Download PDFInfo
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- CN103926645A CN103926645A CN201310140685.5A CN201310140685A CN103926645A CN 103926645 A CN103926645 A CN 103926645A CN 201310140685 A CN201310140685 A CN 201310140685A CN 103926645 A CN103926645 A CN 103926645A
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Abstract
The invention discloses a light guiding plate and a backlight module adopting the light guiding plate. The light guiding plate comprises a light incidence face and a light emergence face connected with the light incidence face, wherein the light incidence face is provided with two or more sawtooth structures embedded into the light incidence face, and the sawtooth structures are perpendicular to the light emergence face. The light guiding plate has the advantages of being even in emergent light, light in brightness, excellent in optical performance and the like.
Description
Technical field
The present invention relates to a kind of light guide plate and backlight module thereof, relate in particular to a kind of bright dipping even, the light guide plate of the high and excellent optical performance of brightness and adopt the backlight module of this light guide plate.
Background technology
Existing backlight module comprises light source and light guide plate, and light source is with respect to the incidence surface setting of light guide plate, and light-guide plate guides light source sends the direction of propagation of light beam, and pointolite or line source are converted into area source outgoing.For LED(light emitting diode) side light guide plate backlight, current, the general broached-tooth design that is provided with adopting at the incidence surface of the light guide plate with respect to light source.As shown in Figure 1a, light guide plate 1 is by comprising that incidence surface 11, the exiting surface 10 being connected with incidence surface 11 form, and be provided with broached-tooth design 13 at incidence surface 11.After light is penetrated by LED lamp 12, through broached-tooth design 13, be refracted and spread.The light of LED lamp is disperseed, make in viewing area the demonstration in (AA district) even.As open in CN201220079031.7, on light guide structure, through machining, form broached-tooth design, the light after sawtooth is more uniformly dispersed.As shown in Fig. 1 c, light L is refracted and left and right diffusion through broached-tooth design 13.
But there is certain defect in the design of above-mentioned broached-tooth design, need to adjust suitable LED lamp 12 mutual spacings and LED lamp 12 to viewing area (AA district) distance, just can make viewing area brightness be uniformly distributed.Its former because, if Fig. 1 b(is the partial enlarged drawing of Fig. 1 a) as shown in, because the diffusion angle of light L after broached-tooth design 13 is limited, therefore the spacing that Led Pitch(LED lamp is mutual) must meet certain ratio with LED lamp 12 light-emitting areas to viewing area AA vertical range H, just can be so that there be light L to form each other dark space DA, can not enter viewing area AA, thereby guarantee that the brightness of viewing area AA is uniformly distributed.
Specifically, be as shown in Figure 1 b because: the light L being sent by LED lamp 12 refraction angle α after broached-tooth design 13 diffusion is certain value, A=1/2 (Led Pitch), be that A is half length of LED Pitch, B is the height of dark space DA, B must be less than H(LED lamp 12 light-emitting areas to viewing area AA vertical range), to meet tg α=A/B simultaneously, the brightness of guarantee viewing area AA is uniformly distributed.
Continuation is with reference to Fig. 1 b, but because low-cost and low-power consumption require to reduce the quantity of LED lamp 12, in a disguised form increases A, from upper surface analysis, requires the corresponding increase of B (negative effect increase profile), or increases angle [alpha]; In addition, because module miniaturization requires to dwindle physical dimension, need sometimes to reduce B, from upper analysis, require that A is corresponding reduces (negative effect increases arranging of LED lamp 12), or increase angle [alpha].But because α is certain value, therefore at the light entrance structures thereof of this light guide plate, limited to a certain extent the development of backlight module low cost low-power consumption and miniaturization.
Summary of the invention
For problems of the prior art, the object of this invention is to provide a kind of light guide plate and backlight module thereof, it is even that this light guide plate has bright dipping, and the high and excellent optical performance of brightness, reduces LED to advantages such as viewing area distances.
According to an exemplary embodiment of the present invention, a kind of light guide plate is provided, it comprises incidence surface, the exiting surface being connected with described incidence surface, wherein: described incidence surface is provided with the broached-tooth design of two or more recessed described incidence surfaces, and described broached-tooth design is perpendicular to described exiting surface.
Preferably, described light guide plate is for side backlight module.
Preferably, described incidence surface is made by refractive index different medium or is made by same medium.General light guide plate is made by macromolecule polymer material, for example polycarbonate, polymethylmethacrylate.For the incidence surface of being made by the different medium of refractive index, can adopt different media to make at the different position of incidence surface, for example the medium of incidence surface front end is polycarbonate, the medium of other parts of incidence surface is polymethylmethacrylate.
Preferably, described incidence surface is provided with the first broached-tooth design and second broached-tooth design of recessed described incidence surface, between described the first broached-tooth design and described the second broached-tooth design, is provided with an engraved structure, in this engraved structure, has air dielectric.
Preferably, described incidence surface is made by refractive index different medium, described incidence surface is provided with the first broached-tooth design and second broached-tooth design of recessed described incidence surface, described the first broached-tooth design and described the second broached-tooth design are positioned on the medium of different refractivity, engraved structure is not set on incidence surface, does not have air dielectric layer.
Preferably, between each cellular construction of described broached-tooth design, be continuous or interrupted; Between each cellular construction, spacing equates or changes in gradient.
Preferably, each cellular construction of described broached-tooth design is triangle or semicircle.
Preferably, described broached-tooth design adopts mechanical post forming method to be arranged on incidence surface.Specifically, first adopt machining mode that the first broached-tooth design is set, then adopt machining mode that the second broached-tooth design is set.
According to an exemplary embodiment of the present invention, a kind of backlight module is provided, comprise light source, also comprise, also comprise above-mentioned light guide plate.
Preferably, described backlight module is side backlight module.
Preferably, described light guide plate is plate shaped or wedge shape.
Preferably, described light source is light emitting diode or bulb.
Can be by the technical scheme through above-mentioned, compared with prior art, the invention discloses a kind of light guide plate and backlight module thereof, this light guide plate comprises incidence surface, the exiting surface being connected with described incidence surface by it, wherein: described incidence surface is provided with the broached-tooth design of two or more recessed described incidence surfaces, and described broached-tooth design is perpendicular to described exiting surface.It is even that this light guide plate has bright dipping, the advantage such as high and excellent optical performance of brightness, make lamp source before Luminance Distribution more even, reduce LED to viewing area distance.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 a is the schematic diagram of disclosed a kind of light guide plate in prior art;
Fig. 1 b is the local schematic diagram amplifying of Fig. 1 b;
Fig. 1 c is that light L is refracted schematic diagram through the broached-tooth design in Fig. 1 b;
Fig. 2 a is the schematic diagram of the embodiment of the present invention one disclosed light guide plate;
Fig. 2 b is the schematic diagram that light L is refracted in the light guide plate of Fig. 2 a;
Fig. 3 a is the schematic diagram of the embodiment of the present invention two disclosed light guide plate;
Fig. 3 b is the schematic diagram that light L is refracted in the light guide plate of Fig. 3 a;
Fig. 4 is the schematic diagram of disclosed side backlight module of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The invention discloses a kind of light guide plate and backlight module thereof, this light guide plate comprises incidence surface, the exiting surface being connected with described incidence surface by it, wherein: described incidence surface is provided with the broached-tooth design of two or more recessed described incidence surfaces, and described broached-tooth design is perpendicular to described exiting surface.It is even that this light guide plate has bright dipping, and the high and excellent optical performance of brightness, reduces LED to advantages such as viewing area distances.Concrete structure is elaborated by following examples.
Embodiment mono-
As shown in Fig. 2 a, Fig. 2 b, the invention discloses a kind of structure of light guide plate, this light guide plate is plate shaped, for side backlight module.This light guide plate 1 mainly comprises incidence surface 11, this incidence surface 11 is on the exiting surface 10 being made, be connected with incidence surface 11 by same dielectric material polycarbonate, incidence surface 11, to be provided with the broached-tooth designs of two recessed described incidence surfaces, be respectively the first broached-tooth design 14, the second broached-tooth design 15, two broached-tooth designs are perpendicular to described exiting surface 10, each cellular construction of this broached-tooth design is equally spaced continuous structure, and it is shaped as triangle.Broached-tooth design adopts mechanical post forming method to be arranged on incidence surface.Specifically, first adopt machining mode that the first broached-tooth design 14 is set, then adopt machining mode that the second broached-tooth design 15 is set.
And be provided with an engraved structure 16 between the first broached-tooth design 14 and the second broached-tooth design 15, owing to being engraved structure, therefore there is air layer, when light is propagated in the process of the second broached-tooth design 15 by the first broached-tooth design 14, must be through the air layer of engraved structure 16, the air of take is propagated as medium, then is entered in the second broached-tooth design 15 by air layer again.
As shown in Figure 2 b, if in light guide plate 1, the second broached-tooth design 15, engraved structure 16 are not set, light can be according to light path L
1propagate, that is: light is penetrated with certain angle by LED lamp 12, enters incidence surface 11 first broached-tooth designs 14 and is refracted and produces left and right diffusion, with light path L by air layer (air dielectric)
1mode, continue, to light guide plate 1 internal communication, to enter in the AA of viewing area, then by exiting surface 10, to be projected the area source of a bright dipping.
But because the diffusion angle of light after the first broached-tooth design 14 is limited, therefore half long A and LED lamp 12 the light-emitting areas spacing that Led Pitch(LED lamp is mutual) must meet certain ratio to viewing area AA vertical range H, just can be so that there be light L to form each other dark space DA, can not enter viewing area AA, thereby the brightness that guarantees viewing area AA is uniformly distributed, and sees Fig. 1 b.When the height B of dark space DA is greater than H, dark space DA can enter viewing area AA, thereby makes the Luminance Distribution of viewing area AA inhomogeneous.
Continue with reference to figure 2b, if in light guide plate 1, the first broached-tooth design 14, the second broached-tooth design 15, engraved structure 16 are set, light can be according to light path L
2propagate, light is penetrated with certain angle by LED lamp 12, enters incidence surface 11 first broached-tooth designs 14 be refracted and produce left and right diffusion by air layer (air dielectric), continues to light guide plate 1 internal communication; Pass through the air layer of engraved structure 16, the air of take is propagated as medium again; By air layer, entered in the second broached-tooth design 15, light enters the second broached-tooth design 15 and can again be refracted and produce further diffusion, with light path L again again
2mode, continue, to light guide plate 1 internal communication, to enter in the AA of viewing area, then to project a uniform area source of bright dipping by exiting surface 10, (in backlight module, miscellaneous part is not shown) as shown in Figure 4, for adopting the schematic diagram of the side backlight module of this light guide plate.
When light is with light path L
2propagate, the first broached-tooth design 14, the second broached-tooth design 15, engraved structure 16 are set in light guide plate 1, light is reflected for several times and is spread, the angle of diffusion is larger, need not adjust suitable LED lamp 12 mutual spacings and LED lamp 12 to viewing area (AA district) distance, the problem that can not exist dark space DA to enter viewing area AA, thus LED lamp 12 shortened to viewing area AA distance, reduce backlight module profile; And improve the front optical effect of light source, make by exiting surface bright dipping more even.
Embodiment bis-
On the basis of the disclosed embodiment mono-of the invention described above, the invention discloses the structure of another light guide plate, as shown in Figure 3 a, 3 b, be this light guide plate schematic diagram, this light guide plate is plate shaped, for side backlight module.This light guide plate 1 mainly comprises incidence surface 11, and this incidence surface 11 is made by the different two media of refractive index, and the medium of incidence surface front end is that the medium of polycarbonate M1, other parts of incidence surface is polymethylmethacrylate M2.On the exiting surface 10 being connected with incidence surface 11, incidence surface 11, be provided with the broached-tooth design of two recessed described incidence surfaces, be respectively the first broached-tooth design 14, the second broached-tooth design 15, two broached-tooth designs are perpendicular to described exiting surface 10, each cellular construction of this broached-tooth design is equally spaced continuous structure, and it is shaped as triangle.It is upper that the first broached-tooth design 14 is arranged on incidence surface front end medium polycarbonate M1, and the second broached-tooth design 15 is arranged on medium polymethylmethacrylate M2.Because the first broached-tooth design 14 and the second broached-tooth design 15 are positioned on different media, the refractive index of different medium is different, therefore engraved structure is not set on incidence surface 11, does not have air dielectric layer, also can make light in incidence surface, propagate through different media, be refracted for several times.
Broached-tooth design adopts post forming method to be arranged on incidence surface.Specifically, first adopt machining mode that the first broached-tooth design 14 is set, then adopt machining mode that the second broached-tooth design 15 is set.
As shown in Figure 3 b, if in light guide plate 1,15 light of the second broached-tooth design are not set can be according to light path L
1propagate.
Continue with reference to figure 3b, if in light guide plate 1, the first broached-tooth design 14, the second broached-tooth design 15 are set, light can be according to light path L
3propagate, light is penetrated with certain angle by LED lamp 12, and the M1 dielectric layer that is entered incidence surface 11 first broached-tooth designs 14 by air layer (air dielectric) is refracted and produces left and right diffusion, continues to light guide plate 1 internal communication; Again through the M2 dielectric layer of the second broached-tooth design 15, the M2 of take propagates as medium; By M2 dielectric layer, entered in the second broached-tooth design 15, light enters the second broached-tooth design 15 and can again be refracted and produce further diffusion, with light path L again again
3mode, continue, to light guide plate 1 internal communication, to enter in the AA of viewing area, then to project a uniform area source of bright dipping (in backlight module, miscellaneous part is not shown) as shown in Figure 4 by exiting surface 10, for adopting the schematic diagram of the side backlight module of this light guide plate.
When light is with light path L
3propagate, the first broached-tooth design 14, the second broached-tooth design 15, two broached-tooth designs be set in light guide plate 1 arranges respectively on medium M1, medium M2, after light enters incidence surface 11, quilt reflects and spread left and right for several times, the angle of diffusion is larger, (AA district) distance can not exist dark space DA to enter the problem of viewing area AA to viewing area need not to adjust suitable LED lamp 12 mutual spacings and LED lamp 12, thereby shorten LED lamp 12 to viewing area AA distance, reduce backlight module profile; And improve the front optical effect of light source, make by exiting surface bright dipping more even.
In this instructions, various piece adopts the mode go forward one by one to describe, and each part stresses is the difference with other parts, between various piece identical similar part mutually referring to.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to embodiment illustrated herein, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a light guide plate, it comprise incidence surface, with the exiting surface that described incidence surface is connected, it is characterized in that: described incidence surface is provided with the broached-tooth designs of two or more recessed described incidence surfaces, and described broached-tooth design is perpendicular to described exiting surface.
2. light guide plate as claimed in claim 1, is characterized in that, described incidence surface is made by refractive index different medium or made by same medium.
3. light guide plate as claimed in claim 2, is characterized in that, described incidence surface is provided with the first broached-tooth design and second broached-tooth design of recessed described incidence surface, between described the first broached-tooth design and described the second broached-tooth design, is provided with an engraved structure.
4. light guide plate as claimed in claim 2, it is characterized in that, described incidence surface is made by refractive index different medium, described incidence surface is provided with the first broached-tooth design and second broached-tooth design of recessed described incidence surface, and described the first broached-tooth design and described the second broached-tooth design are positioned on the medium of different refractivity.
5. light guide plate as claimed in claim 1, is characterized in that, is continuous or interrupted between each cellular construction of described broached-tooth design; Between each cellular construction, spacing equates or changes in gradient.
6. light guide plate as claimed in claim 1, is characterized in that, each cellular construction of described broached-tooth design is triangle or semicircle.
7. light guide plate as claimed in claim 1, is characterized in that, the forming method of described broached-tooth design is mechanical post forming method.
8. a backlight module, comprises light source, it is characterized in that, also comprises the light guide plate as described in claim 1-7 any one.
9. backlight module as claimed in claim 9, is characterized in that, described backlight module is side backlight module; Described light guide plate is plate shaped or wedge shape; Described light source is light emitting diode or bulb.
10. a display device, comprises backlight module, and described backlight module comprises light source, it is characterized in that, described backlight module also comprises the light guide plate as described in claim 1-7 any one.
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| CN201310140685.5A CN103926645B (en) | 2013-04-22 | 2013-04-22 | Light guide plate, backlight module and display device |
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| CN201310140685.5A CN103926645B (en) | 2013-04-22 | 2013-04-22 | Light guide plate, backlight module and display device |
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| CN105629370A (en) * | 2016-01-05 | 2016-06-01 | 京东方光科技有限公司 | Light guide plate, backlight module and display device |
| CN105954828A (en) * | 2016-07-12 | 2016-09-21 | 京东方科技集团股份有限公司 | Manufacturing method of light guide plate, light guide plate and backlight source |
| CN106707402A (en) * | 2017-01-11 | 2017-05-24 | 青岛骐骥光电科技有限公司 | Device and method for solving Hotspot problem of side-inlet type light guide plate |
| CN107270242A (en) * | 2017-07-21 | 2017-10-20 | 中国科学院上海光学精密机械研究所 | Lift the amplifier architecture of xenon lamp transmission efficiency and distributing homogeneity |
| CN107561628A (en) * | 2017-09-05 | 2018-01-09 | 深圳市华星光电技术有限公司 | Display device, backlight module and its light guide plate |
| CN109358452A (en) * | 2018-12-10 | 2019-02-19 | 深圳市隆利科技股份有限公司 | A kind of light guide plate LED light integral structure and its forming method |
| CN111679497A (en) * | 2020-06-17 | 2020-09-18 | 武汉华星光电技术有限公司 | Backlight module and liquid crystal display panel |
| CN112086014A (en) * | 2020-09-16 | 2020-12-15 | 武汉华星光电技术有限公司 | Backlight module and display device |
| CN112771308A (en) * | 2019-08-02 | 2021-05-07 | 京东方科技集团股份有限公司 | Light guide assembly, light source module and display device |
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| CN109358452A (en) * | 2018-12-10 | 2019-02-19 | 深圳市隆利科技股份有限公司 | A kind of light guide plate LED light integral structure and its forming method |
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