CN203309702U - Backlight module and display device - Google Patents

Backlight module and display device Download PDF

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Publication number
CN203309702U
CN203309702U CN2013204117320U CN201320411732U CN203309702U CN 203309702 U CN203309702 U CN 203309702U CN 2013204117320 U CN2013204117320 U CN 2013204117320U CN 201320411732 U CN201320411732 U CN 201320411732U CN 203309702 U CN203309702 U CN 203309702U
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China
Prior art keywords
light guide
incidence surface
backlight module
light
guide member
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Expired - Fee Related
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CN2013204117320U
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Chinese (zh)
Inventor
占江徽
吕昶
陈守年
朴辰武
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BOE Technology Group Co Ltd
Hefei BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Hefei BOE Optoelectronics Technology Co Ltd
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Priority to CN2013204117320U priority Critical patent/CN203309702U/en
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Abstract

The utility model provides a backlight module and a display device. The backlight module comprises a light guide panel, at least one point light source and a light guide component, wherein the light guide panel is provided with a first incidence surface and a first emergence surface; the light guide component is used for converting light rays emitted by the point light source into a line light source; the light guide component is provided with at least one second incidence surface and a second emergence surface; at least part of the second incidence surface of the light guide component is opposite the light-emitting surface of the point light source; and at least part of the second emergence surface of the light guide component is opposite the first incidence surface of the light guide panel. According to the scheme, the light guide component is arranged to convert the light rays of the point light source into the line light source, and the light guide panel is utilized to convert the line light source into a uniform-brightness surface light source, thereby enhancing the picture uniformity and avoiding the problem of picture hotspots when a point light source is directly converted into a surface light source. The utility model can reduce the quantity of point light sources, lower the power consumption of the point light source and lower the cost.

Description

Backlight module and display unit
Technical field
The utility model relates to technical field of liquid crystal display, relates in particular to a kind of backlight module and display unit.Background technology
In general liquid crystal display, liquid crystal panel does not have lighting function, thus below liquid crystal panel, can configure a backlight module, so that an area source to be provided, to reach the function of demonstration.In the light emitting source of backlight module, light emitting diode (LED) is widely used because of advantages such as its luminous efficiency are high, colour gamut is high.Because LED is spot light, the lighting angle of its light-emitting area is limited, usually in the backlight module of liquid crystal display, a plurality of LED can be arranged in a row and make LED lamp bar, to provide in line source to a LGP, the recycling LGP is converted to line source the area source of liquid crystal panel, reaches the effect of demonstration so that liquid crystal display to be provided.
As shown in Figure 1, in prior art, backlight module comprises a LGP 2, a light source, wherein, described light source is the LED lamp bar that is arranged with a plurality of LED lamps 1, LGP 2 has an incidence surface, an exiting surface adjacent with incidence surface and one and the light diffusingsurface that is oppositely arranged of described exiting surface, the light-emitting area of LED lamp 1, towards the incidence surface of described LGP, is distributed with scattering netted dot on the light diffusingsurface of LGP 2.The light that LED lamp 1 sends sees through the incidence surface of LGP to be incident in LGP, and the light be incident in LGP can be by the light diffusingsurface scattering relative with exiting surface, and equably by the exiting surface outgoing, to provide liquid crystal panel one area source.
Figure 2 shows that the schematic diagram of the LED lamp bar of being made by light emitting diode in existing backlight module.The optical field distribution that substantially is lambert's body (lambertian) because of light emitting diode, its forward has stronger luminous intensity, and this causes the phenomenon of contiguous LED lamp bar viewing area luminance nonuniformity, and this phenomenon is called focus (hot spot).As shown in Figure 1, from the light-emitting area of LED lamp 1 more away from, it is more even that the light that each spot light sends mixes, but along with the demand of people for the narrow frame of liquid crystal display, the requirement of frame size has limited distance between the light-emitting area of the edge, viewing area of liquid crystal panel and LED lamp 1, and this makes hot issue very serious.The common method that solves hot issue is to increase LED lamp quantity to reduce necessary light mixing distance, reduces simultaneously the accurate operating current of LED beacon light, to meet the power consumption requirement.The increase of LED lamp quantity has just increased cost, thereby reduces the whole competitiveness of product in market, and the LED lamp is not worked under normalized current, formed a kind of wasting of resources yet.
The utility model content
The display unit that the purpose of this utility model is to provide a kind of backlight module and has this backlight module, can provide uniform light, can solve display unit picture hot issue in prior art.
Technical scheme provided by the utility model is as follows:
A kind of backlight module comprises:
LGP, described LGP have the first incidence surface and the first exiting surface;
At least one spot light; And,
For the light that described spot light is sent, be converted to the light guide member of line source, described light guide member has at least one second incidence surface and the second exiting surface;
Wherein, at least a portion of the second incidence surface of described light guide member is relative with the light-emitting area of described spot light, and at least a portion of the second exiting surface of described light guide member is relative with the first incidence surface of described LGP.
Further, described LGP also comprises first a smooth diffusingsurface relative with described the first exiting surface, and the described first smooth diffusingsurface is provided with the first scattering netted dot structure.
Further, at least one described second incidence surface and described the second exiting surface are adjacent;
Described light guide member also comprises second a smooth diffusingsurface relative with described the second exiting surface, and the described second smooth diffusingsurface is provided with the second scattering netted dot structure.
Further, at least one side beyond the second incidence surface of described light guide member, the second exiting surface, be coated with reflector plate or be coated with reflecting layer.
Further, described the second incidence surface is positioned at an end of described light guide member, and its area is less than the area of described the second exiting surface.
Further, on described the second exiting surface away from described the second incidence surface, and with described the first incidence surface over against part form one first depressed part;
Close described the second incidence surface on described the second exiting surface, and the part that exceeds described the first incidence surface forms one first protuberance, the first end of described the first protuberance and described the second incidence surface adjacency, the second end of described the first protuberance and the first end of described the first depressed part connect as one;
Wherein said the first protuberance from described the second exiting surface to the first width formed between the described second smooth diffusingsurface be greater than described the first depressed part from described the second exiting surface to the second width formed between the described second smooth diffusingsurface.
Further, described backlight module also comprises the optical diaphragm group of the first exiting surface one side that is arranged at described LGP;
Described light guide member also comprises:
First side adjacent with described the second incidence surface, described the second exiting surface and the described second smooth diffusingsurface respectively, at least a portion of described the first side and described optical diaphragm group are over against setting;
And, second side relative with described the first side;
Wherein, on described the first side away from described the second incidence surface, and with described optical diaphragm group over against part form one second depressed part;
On described the first side, be adjacent to described the second incidence surface, and the part that exceeds described optical diaphragm group forms one second protuberance, the first end of described the second protuberance and described the second incidence surface adjacency, the second end of described the second protuberance and the first end of described the second depressed part connect as one;
Wherein said the second protuberance from described the first side to the first the second height formed between described the first side to described the second side that highly is greater than described the second depressed part formed between described the second side.
Further, described spot light is light emitting diode.
Further, the material of described light guide member is polycarbonate pc or optical-grade polymethylmethacrylacontinuous.
A kind of display unit, it comprises backlight module as above.
The beneficial effects of the utility model are as follows:
In such scheme, by a light guide member is set, can convert the light of spot light to line source, the recycling LGP converts line source to the area source of brightness homogeneous, and the raising picture homogeneous degree avoids spot light directly to be converted to the picture hot issue that area source causes; And can reduce spot light quantity, reduce the spot light power consumption, reduce costs.By further scheme of the present utility model, the backlight module that the utility model provides can also meet the requirement of display unit slimming and narrow frame.
The accompanying drawing explanation
Fig. 1 means that LED lamp bar in prior art causes producing the principle schematic of focus;
Fig. 2 means the schematic diagram of LED lamp bar in prior art;
Fig. 3 means the schematic diagram of the first embodiment of backlight module provided by the utility model;
Fig. 4 means the schematic diagram of the second embodiment of backlight module provided by the utility model;
Fig. 5 mean after the backlight module of the second embodiment and optical diaphragm group assembling schematic diagram;
Fig. 6 means the schematic diagram of the third embodiment of backlight module provided by the utility model;
Fig. 7 means the schematic diagram of the 4th kind of embodiment of backlight module provided by the utility model;
Fig. 8 means the schematic diagram of the 5th kind of embodiment of backlight module provided by the utility model.
The specific embodiment
Below in conjunction with accompanying drawing, principle of the present utility model and feature are described, example, only be used to explaining the utility model, is not intended to limit scope of the present utility model.
For the light that solves spot light in prior art directly into being incident upon LGP, and convert area source to by LGP, easily cause picture the problem of focus to occur, the utility model provides a kind of backlight module, it can convert the light of spot light to the area source of brightness homogeneous, avoids display unit picture hot spot phenomenon to occur.As shown in Fig. 3 to 8, backlight module provided by the utility model comprises: LGP 200, spot light and for the light that described spot light is sent, be converted to the light guide member 300 of line source, wherein,
Described LGP 200 can be a cuboid LGP 200, its have the first incidence surface 201, with adjacent the first exiting surface 202 of described the first incidence surface 201 and the first smooth diffusingsurface (in figure do not mark) relative with described the first exiting surface 202;
Described spot light preferably adopts LED lamp 100;
Described light guide member 300 has the second incidence surface 301 and the second exiting surface 302;
At least a portion of the second incidence surface 301 of described light guide member 300 is relative with the light-emitting area of described LED lamp 100, and at least a portion of the second exiting surface 302 of described light guide member 300 is relative with the first incidence surface 201 of described LGP 200.
Adopt such scheme, the second incidence surface 301 that the light sent by described LED lamp 100 sees through light guide member 300 is incident in light guide member 300, and convert line source to through light guide member 300, the second exiting surface 302 outgoing via light guide member 300, the first incidence surface 201 that sees through again LGP 200 enters in LGP 200, and the area source of brightness homogeneous is provided for the liquid crystal panel (not shown).
In the first embodiment provided by the utility model, preferably, as shown in Figure 3, described light guide member 300 is the lamp guide of elongated structure, one end end face of this light guide member 300 forms described second incidence surface 301, described the second exiting surface 302 is adjacent with described the second incidence surface 301, and the area of described the second incidence surface 301 is less than the area of described the second exiting surface 302.As shown in Figure 3, described light guide member 300 also has:
The one second smooth diffusingsurface (in figure do not mark) relative with described the second exiting surface 302, the described second smooth diffusingsurface is provided with the second scattering netted dot structure 303;
First side 304 adjacent with described the second incidence surface 301, described the second exiting surface 302 and the described second smooth diffusingsurface respectively; And, second side (in figure do not mark) relative with described the first side 304.
It should be noted that, in the present embodiment, as shown in Figure 3, described light guide member 300 is for having the strip structure of six sides, and in six sides of described light guide member 300, other sides except the second incidence surface, the second exiting surface and the second smooth diffusingsurface can be planar structure.Should be understood that, in actual applications, described light guide member 300 can be for having the multiple edge body structure of a plurality of sides, and other sides except the second incidence surface, the second exiting surface and the second smooth diffusingsurface of described light guide member 300 also can be other structures, such as arcwall face structure, stepped surfaces structure etc., the concrete shape of light guide member 300 is not limited at this.
Adopt such scheme, a LED lamp 100 can be arranged to an end outside of LGP 200, and make the size of the second incidence surface 301 and corresponding the getting final product of light-emitting area size of a LED lamp 100, and without plurality of LEDs lamp 100 is set.
In addition, in such scheme, offside at the second exiting surface 302 arranges the second smooth diffusingsurface, on the second smooth diffusingsurface, the scattering netted dot structure is set, these scattering netted dot structures can be the micro-structurals of the regularity of distribution, preferably, these micro-structurals can be miniature bowl configurations or the micro-protrusions structures be arranged on the second smooth diffusingsurface, perhaps by printing ink coating, be formed at micro-structural on the second smooth diffusingsurface etc., and, preferably, the distribution density of these micro-structurals increases to the end away from described LED lamp 100 gradually from the end near LED lamp 100, thereby can destroy total reflection, the light that is incident to light guide member 300 inside is modulated, so that finally at the second exiting surface 302, obtain the light distribution of continuous uniform, to form line source, be conducive to the lifting of picture homogeneous degree, and reduced the optical design difficulty of LGP 200.
What certainly can understand is that in actual applications, the structure of light guide member 300 is not limited to said structure.
In addition, in order to increase the utilization ratio of light, promote brightness, preferred, on the second incidence surface 301 of described light guide member 300, at least one side beyond the second exiting surface 302, be coated with reflector plate or be coated with reflecting layer.Preferably, on the second smooth diffusingsurface, be coated with the reflector plate (not shown).In addition, on the first side, the second side, also can cover the reflector plate (not shown).
In addition, on first of LGP the smooth diffusingsurface, also can cover the reflector plate (not shown).
In addition, described backlight module also comprises the optical diaphragm group of the first exiting surface 202 1 sides that are arranged at described LGP 200, at least a portion of the first side 304 of described light guide member 300 and described optical diaphragm group over against.
In order to meet brightness requirement, LED lamp in prior art in common backlight module is generally great power LED, such LED light-emitting area width is larger, and in order to obtain the high optical efficiency that enters, usually the thickness of the LGP in backlight module is consistent with the height of the light-emitting area of LED lamp, and can cause the thickness of backlight module larger after the optical diaphragm group that superposes again on LGP.
In the second embodiment provided by the utility model, both brightness requirement can be met, slimming can be realized again.Particularly,
As shown in Figure 4, in the present embodiment, the second incidence surface 301 of light guide member 300 forms between described the first side 304 to described the second side third high degree a should be consistent with the light-emitting area width h of described LED lamp 100, to meet brightness requirement;
On described the first side 304 away from described the second incidence surface 301, and with described optical diaphragm group 400 over against part form one second depressed part 310, described the second depressed part 310 is caved inward and is formed by described the first side 304;
On described the first side 304, be adjacent to described the second incidence surface 301, and the part that exceeds described optical diaphragm group 400 forms one second protuberance 311, the first end of described the second protuberance 311 and described the second incidence surface 301 adjacency, the second end of described the second protuberance 311 and the first end of described the second depressed part 310 connect as one;
The first height h formed between described the first side 304 to described the second side of wherein said the second protuberance 311 1Be greater than the second height h formed of described the second depressed part 310 between described the first side 304 to described the second side 2.
Adopt such scheme, as shown in Figure 5, optical diaphragm group 400 is placed in the second depressed part 310 of described light guide member 300, thereby the thickness after described light guide member 300 and 400 stacks of described optical diaphragm group still can be consistent with the height of LED lamp 100, thereby can reduce the thickness of backlight module, realize slimming.
As shown in Figure 4, in the present embodiment, the first height h of described the second protuberance 311 1Gradually less to the second end from first end, that is to say, the part of the second protuberance 311 correspondences of described light guide member 300 is wedge structure, what certainly can understand is, the part of the second protuberance 311 correspondences of described light guide member 300 can be also other structures, such as, as shown in Figure 4, the stepped structure of part that the part of the second protuberance 311 correspondences of described light guide member 300 is corresponding with described the second depressed part 310.
In the third embodiment provided by the utility model, can also meet further the narrow frame requirement of display unit.Particularly,
As shown in Figure 6, in the third embodiment provided by the utility model, described the second incidence surface 301 from described the second exiting surface 302 to the 3rd width d formed between the described second smooth diffusingsurface 1Width d with the light-emitting area of described LED lamp 100 2Unanimously, to meet brightness requirement;
On described the second exiting surface 302 away from described the second incidence surface 301, and with described the first incidence surface 201 over against part form one first depressed part 320, described the first depressed part 320 is caved inward and is formed by described the second exiting surface 302;
Close described the second incidence surface 301 on described the second exiting surface 302, and the part that exceeds described the first incidence surface 201 forms one first protuberance 321, the first end of described the first protuberance 321 and described the second incidence surface 301 adjacency, the second end of described the first protuberance 321 and the first end of described the first depressed part 320 connect as one;
Wherein said the first protuberance 321 from described the second exiting surface 302 to the first width d formed between the described second smooth diffusingsurface 3Be greater than described the first depressed part 320 from described the second exiting surface 302 to the second width d formed between the described second smooth diffusingsurface 4.
Adopt such scheme, as shown in Figure 6, LGP 200 is placed in the position of the first depressed part 320 correspondences of described light guide member 300, thereby the frame of display unit only is greater than the second width d of described light guide member 300 4Get final product, the border width of display unit can be less than the width d of LED lamp 100 2, realize narrow frame.
As shown in Figure 6, in the present embodiment, the first width d of described the first protuberance 321 3Gradually less to the second end from first end, that is to say, the part of the first protuberance 321 correspondences of described light guide member 300 is wedge structure, what certainly can understand is, the part of the first protuberance 321 correspondences of described light guide member 300 can be also other structures, such as, as shown in the figure, the stepped structure of part that the part of the first protuberance 321 correspondences of described light guide member 300 is corresponding with described the first depressed part 320.
In addition, as shown in Figure 7, in the 4th kind of embodiment provided by the utility model, the first protuberance 321, the second protuberance 311, the first depressed part 320 and the second depressed part 310 can be set simultaneously on light guide member 300, thereby meet simultaneously narrow frame and the slimming requirement of display unit.
In addition, as shown in Figure 8, in the 5th kind of embodiment provided by the utility model, LED lamp 100 can also be provided with two.Two LED lamps 100 are arranged at the two ends of light guide member 300 simultaneously.
In addition, also it should be noted that, the material of described light guide member 300 can adopt the material identical with LGP 200, such as polycarbonate pc or optical-grade polymethylmethacrylacontinuous.
Also purpose of the present utility model is to provide a kind of display unit, and it comprises backlight module as above.
It is more than preferred embodiment of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims (10)

1. backlight module, comprising: LGP, described LGP have the first incidence surface and the first exiting surface; At least one spot light; It is characterized in that, described backlight module also comprises:
For the light that described spot light is sent, be converted to the light guide member of line source, described light guide member has at least one second incidence surface and the second exiting surface;
Wherein, at least a portion of the second incidence surface of described light guide member is relative with the light-emitting area of described spot light, and at least a portion of the second exiting surface of described light guide member is relative with the first incidence surface of described LGP.
2. backlight module according to claim 1, is characterized in that,
Described LGP also comprises first a smooth diffusingsurface relative with described the first exiting surface, and the described first smooth diffusingsurface is provided with the first scattering netted dot structure.
3. backlight module according to claim 1, is characterized in that,
At least one described second incidence surface and described the second exiting surface are adjacent;
Described light guide member also comprises second a smooth diffusingsurface relative with described the second exiting surface, and the described second smooth diffusingsurface is provided with the second scattering netted dot structure.
4. backlight module according to claim 3, is characterized in that, at least one side beyond the second incidence surface of described light guide member, the second exiting surface, is coated with reflector plate or applies reflecting layer.
5. backlight module according to claim 3, is characterized in that, described the second incidence surface is positioned at an end of described light guide member, and its area is less than the area of described the second exiting surface.
6. backlight module according to claim 3, is characterized in that,
Described the second exiting surface away from described the second incidence surface, and with described the first incidence surface over against part form one first depressed part;
Close described second incidence surface of described the second exiting surface, and the part that exceeds described the first incidence surface forms one first protuberance, the first end of described the first protuberance and described the second incidence surface adjacency, the second end of described the first protuberance and the first end of described the first depressed part connect as one;
Wherein said the first protuberance from described the second exiting surface to the first width formed between the described second smooth diffusingsurface be greater than described the first depressed part from described the second exiting surface to the second width formed between the described second smooth diffusingsurface.
7. backlight module according to claim 3, is characterized in that,
Described backlight module also comprises the optical diaphragm group of the first exiting surface one side that is arranged at described LGP;
Described light guide member also comprises:
First side adjacent with described the second incidence surface, described the second exiting surface and the described second smooth diffusingsurface respectively, at least a portion of described the first side and described optical diaphragm group are over against setting;
And, second side relative with described the first side;
Wherein, on described the first side away from described the second incidence surface, and with described optical diaphragm group over against part form one second depressed part;
On described the first side, be adjacent to described the second incidence surface, and the part that exceeds described optical diaphragm group forms one second protuberance, the first end of described the second protuberance and described the second incidence surface adjacency, the second end of described the second protuberance and the first end of described the second depressed part connect as one;
Wherein said the second protuberance from described the first side to the first the second height formed between described the first side to described the second side that highly is greater than described the second depressed part formed between described the second side.
8. backlight module according to claim 1, is characterized in that,
Described spot light is light emitting diode.
9. backlight module according to claim 1, is characterized in that,
The material of described light guide member is polycarbonate pc or optical-grade polymethylmethacrylacontinuous.
10. a display unit, is characterized in that, comprises backlight module as described as claim 1 to 9 any one.
CN2013204117320U 2013-07-10 2013-07-10 Backlight module and display device Expired - Fee Related CN203309702U (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104075249A (en) * 2014-07-16 2014-10-01 昆山市诚泰电气股份有限公司 Light guide structure capable of converting point light sources into area light sources and panel lamp with the light guide structure
CN108458280A (en) * 2018-02-23 2018-08-28 重庆京东方光电科技有限公司 Backlight assembly and its assemble method, display device
CN109521513A (en) * 2018-11-28 2019-03-26 福建捷联电子有限公司 A kind of LED light emission device
WO2019214218A1 (en) * 2018-05-08 2019-11-14 深圳市绎立锐光科技开发有限公司 Light source and illumination device
CN112987411A (en) * 2019-12-13 2021-06-18 深圳市隆利科技股份有限公司 Side-in backlight module and electronic equipment
CN114137652A (en) * 2021-12-07 2022-03-04 华玻视讯(珠海)科技有限公司 Novel glass light guide plate
CN114446178A (en) * 2021-11-18 2022-05-06 达运精密工业股份有限公司 Display cover plate

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104075249A (en) * 2014-07-16 2014-10-01 昆山市诚泰电气股份有限公司 Light guide structure capable of converting point light sources into area light sources and panel lamp with the light guide structure
CN108458280A (en) * 2018-02-23 2018-08-28 重庆京东方光电科技有限公司 Backlight assembly and its assemble method, display device
CN108458280B (en) * 2018-02-23 2021-01-29 重庆京东方光电科技有限公司 Backlight assembly, assembling method thereof and display device
WO2019214218A1 (en) * 2018-05-08 2019-11-14 深圳市绎立锐光科技开发有限公司 Light source and illumination device
CN109521513A (en) * 2018-11-28 2019-03-26 福建捷联电子有限公司 A kind of LED light emission device
CN112987411A (en) * 2019-12-13 2021-06-18 深圳市隆利科技股份有限公司 Side-in backlight module and electronic equipment
CN114446178A (en) * 2021-11-18 2022-05-06 达运精密工业股份有限公司 Display cover plate
CN114446178B (en) * 2021-11-18 2024-01-30 达运精密工业股份有限公司 Display cover plate
CN114137652A (en) * 2021-12-07 2022-03-04 华玻视讯(珠海)科技有限公司 Novel glass light guide plate
CN114137652B (en) * 2021-12-07 2023-11-28 华玻视讯(珠海)科技有限公司 Glass light guide plate

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