CN102954412B - Display device and backlight module thereof - Google Patents
Display device and backlight module thereof Download PDFInfo
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- CN102954412B CN102954412B CN201210450182.3A CN201210450182A CN102954412B CN 102954412 B CN102954412 B CN 102954412B CN 201210450182 A CN201210450182 A CN 201210450182A CN 102954412 B CN102954412 B CN 102954412B
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- led lamp
- lamp bead
- backlight module
- lamp bar
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Abstract
The embodiment of the invention discloses a kind of backlight module, comprise pedestal and some LED lamp bar be evenly arranged on pedestal, described LED lamp bar comprises circuit board and some LED lamp bead be arranged on described circuit board, LED lamp bead quantity in every root LED lamp bar is identical, each LED lamp bead spacing in same LED lamp bar is identical, and LED lamp bead spacing in any two adjacent LED lamp bar is different, and the LED lamp bead density of backlight module two side ends is less than the LED lamp bead density at middle part.The backlight module of the embodiment of the present invention realizes the evenly staggered of LED lamp bead by the LED lamp bar that the many LED lamp bead spacing of being crisscross arranged side by side are different, arrange on the reflecting surface of lens simultaneously some pyramidal structures with realize light repeatedly anti-/ refraction, structure is simple, stable performance, cost is low, and effectively improves overall illumination and uniformity coefficient.
Description
Technical field
The present invention relates to electronic display technology field, particularly relate to a kind of display device and backlight module thereof.
Background technology
Liquid crystal display (LiquidCrystalDisplay, be called for short LCD), because self is not luminous, needs to use backlight module as light source.Existing backlight module can be divided into side-light backlight module and down straight aphototropism mode set two kinds usually.
Existing down straight aphototropism mode set generally forms illuminating source by some LED lamp bead array arrangements, as 32 inch liquid crystal display need use the LED lamp bead of nearly more than 500, and the LED lamp bead that undersized liquid crystal display uses reaches more than 36 at least, numerous LED lamp bead like this needs to connect by the mode of series and parallel, control circuit is complicated, cost of manufacture is expensive, and luminous flux utilization factor is low, and heating is serious; And once certain LED lamp pearl wherein damages, will cause the fault of whole down straight aphototropism mode set, numerous LED lamp bead like this, the probability of initiating failure is very large; Meanwhile, because illumination individual in some LED lamp bead has certain difference, be illumination and the uniformity coefficient of satisfied entirety, advanced optical diaphragm usually need be utilized to strengthen brightness and the mist degree of LED lamp bead, cause cost to increase.
Due to the light source characteristic of display device, when meeting global illumination uniformity coefficient, the illumination of backlight module side need be slightly less than the illumination in the middle part of it, and usually, the illumination of side is only 75% of middle part illumination.Traditional backlight module is normally by regulating the illumination brightness of LED lamp bead to realize, namely when LED lamp bead is evenly arranged, configure corresponding light adjusting circuit in addition with the LED lamp bead illumination brightness value making the illumination brightness value of middle part LED lamp bead be greater than side, due to special light adjusting circuit need be configured, circuit arrangement is complicated, and cost is high.
Summary of the invention
Embodiment of the present invention technical matters to be solved is, provides a kind of backlight module, and structure is simple, and stable performance, cost is low.
The further technical matters to be solved of the embodiment of the present invention is to provide a kind of display device, stable performance, and cost is low.
In order to solve the problems of the technologies described above, the embodiment of the present invention proposes a kind of backlight module, comprise pedestal and some LED lamp bar be evenly arranged on pedestal, described LED lamp bar comprises circuit board and some LED lamp bead be arranged on described circuit board, LED lamp bead quantity in every root LED lamp bar is identical, each LED lamp bead spacing in same LED lamp bar is identical, and LED lamp bead spacing in any two adjacent LED lamp bar is different, and the LED lamp bead density of backlight module two side ends is less than the LED lamp bead density at middle part.
Further, the LED lamp bead spacing in the LED lamp bar of any two alternate settings is identical.
Further, quantity >=3 of described LED lamp bar.
Further, quantity >=6 of the LED lamp bead in single LED lamp bar.
Further, described LED lamp bar also comprises the lens covering at described LED lamp bead outside, first side of described lens is provided with and is recessed into the pit of accommodating LED lamp bead to lens interior, the hole wall of pit forms the plane of incidence of lens, second side of lens is the smooth surface of evagination and forms the exit facet of lens, described first side is formed the reflecting surface of light reflection to exit facet around described pit, and described reflecting surface is made up of jointly the side of the pyramidal structure of some even arrangements.
Further, described pyramidal structure is from the first side to the fin cone that its outer protrudes, or is the recessed pyramid recessed to lens interior from the first side.
Further, the rectangular array arrangement of described pyramidal structure.
Further, described pyramidal structure is rectangular pyramid structure or triangular pyramid structure.
Further, described exit facet is overall in convex arc planar and the surface of revolution that oppositely caves in of middle part, and described surface of revolution is the bimodal curve with two symmetrical convex peaks of arc along the cross section in own central axis face, is connected between described bimodal curve by wedge angle.
Correspondingly, the embodiment of the present invention additionally provides a kind of display device, comprises backlight module as above.
The beneficial effect of the embodiment of the present invention is: by the spacing between the LED lamp bead in adjacent two LED lamp bar is set to difference, realize the staggered of LED lamp bead, under the prerequisite meeting illumination and uniformity coefficient, reduce LED lamp bead quantity, structure is simple, stable performance, and cost is low; Arrange some pyramidal structures in the first side of lens and jointly formed the reflecting surface of lens by the cone wall of pyramidal structure, refraction angle is larger, bright dipping evenly, effectively improve overall illumination and uniformity coefficient.
Accompanying drawing explanation
Fig. 1 is the structural representation of the backlight module of the embodiment of the present invention.
Fig. 2 is the cross-sectional view of the backlight module shown in Fig. 1 along A-A direction.
Fig. 3 is the structural representation of the LED lamp bar of the embodiment of the present invention.
Fig. 4 is the stereographic map of the lens of the embodiment of the present invention.
Fig. 5 is the structural representation of the lens of the embodiment of the present invention.
Fig. 6 is the cross-sectional view of the lens shown in Fig. 5 along B-B direction.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can be combined with each other, and are described in further detail the present invention below in conjunction with the drawings and specific embodiments.
As shown in Fig. 1 ~ Fig. 6, the embodiment of the present invention provides a kind of backlight module and is provided with the display device of this backlight module.
Please refer to Fig. 1, Fig. 2, described backlight module comprises pedestal 10 and some LED lamp bar 20 be evenly arranged in described pedestal 10.
Described pedestal 10 is made up of a base plate 11 and four side plates 12, described side plate 12 outward-dipping and and form obtuse angle between described base plate 11, it is for accommodating fixing described LED lamp bar 20 and the light that described LED lamp bar 20 is launched upwards is reflected the backlight forming described display device.As one preferably embodiment, the angle number of degrees between described base plate 11 and side plate 12 are preferably 135 ° ~ 140 °.
In the embodiment of the present invention, described LED lamp bar 20 magnitude setting is preferably more than 3 or 3, and equidistant laid out in parallel is on the base plate 11 of described pedestal 10, and each described LED lamp bar 20 is in parallel the light emitting source jointly forming described backlight module.
As shown in Figure 3, described LED lamp bar 20 specifically comprises circuit board 21 and some LED lamp bead 22 be arranged on described circuit board 21.For ensureing the uniformity coefficient of described backlight module illumination, in the embodiment of the present invention, the equidistant even arrangement of LED lamp bead 22 in single described LED lamp bar 20; Meanwhile, for ensureing that described backlight module has enough illumination, the quantity of the LED lamp bead 22 in single described LED lamp bar 20 reaches more than 6 or 6.
In the embodiment of the present invention, described backlight module meets the particular/special requirement of display device to intensity of illumination and uniformity coefficient by regulating the arrangement density of described LED lamp bead 22.Please refer to Fig. 1, Fig. 2, LED lamp bead 22 spacing in any two adjacent LED lamp bar 20 of described backlight module is set to different value, stagger mutually to make the LED lamp bead 22 in two adjacent LED lamp bar 20, and the density of LED lamp bead 22 in the middle part of it is greater than the density of the LED lamp bead 22 of two side ends, with the illumination making its middle illumination be greater than two side ends, and then ensure the uniform illumination degree of described backlight module entirety.
When the quantity of LED lamp bar 20 described in same backlight module is set to more than 3 or 3, the spacing of the LED lamp bead 22 in the described LED lamp bar 20 of any two alternate settings is identical with the overall homogeneity ensureing described backlight module.
As shown in Figure 1, as a kind of preferred implementation, the magnitude setting of the described LED lamp bar 20 in the embodiment of the present invention is specially 3, the quantity of the LED lamp bead 22 in LED lamp bar 20 described in every root is all set to 6, and each LED lamp bead 22 spacing in same LED lamp bar 20 is identical, the sum of the LED lamp bead 22 arranged in the backlight module namely shown in the embodiment of the present invention amounts to 18.When configuring described LED lamp bead 22, the power of single described LED lamp bead 22 is 1.2W, and the electric current of single described LED lamp bead 22 is 400mA.Please continue to refer to Fig. 1, when specifically arranging described LED lamp bar 20, spacing between the LED lamp bead 22 in two LED lamp bar 20 is in the outer part equal, and the spacing between the LED lamp bead 22 that the spacing be positioned between the LED lamp bead 22 in middle LED lamp bar 20 is slightly less than in both sides LED lamp bar 20.As shown in Figure 2, when adopting this kind of mode to arrange, in the middle part of described backlight module, the density of LED lamp bead 22 is slightly larger than the density of its two side ends LED lamp bead 22, when identical by the electric current of each LED lamp bead 22, the overall brightness value in the middle part of it can slightly larger than the brightness value of its side to meet the particular/special requirement of display device to backlight module illumination.The described backlight module of the embodiment of the present invention, in minimizing LED lamp bead 22 quantity and when not setting up separately light adjusting circuit, the designing requirement of backlight module illumination and uniformity coefficient can be met equally, structure is simple, cost of manufacture is low, and due to the minimizing of LED lamp bead 22 quantity, its probability broken down also decreases, and performance is more reliable and more stable.
Please refer to Fig. 3, described LED lamp bead 22 outer cup is provided with lens 23, described lens 23 are used for the light source that described LED lamp bead 22 is launched to spread to greatest extent as a kind of optical element, in the embodiment of the present invention, described lens 23 are roughly in hemispherical, be made up of transparent optical material, as acrylic polymers, high molecular polymer, macromolecule carbon compound, glass or quartz etc.
As shown in Fig. 4 ~ Fig. 6, described lens 23 comprise the first side 231 and the second side 232 be connected.
Described first side 231 is the end face contacted with described circuit board 21 of described lens 23, be provided with in the middle part of it to described lens 23 internal recess with the pit 2311 of accommodating described LED lamp bead 22, the hole wall of described pit 2311 forms the plane of incidence of described lens 23.
Described second side 232 is the smooth surface of evagination, and forms the exit facet of described lens 23.In the embodiment of the present invention, described second side 232 is overall in convex arc planar and the surface of revolution that oppositely caves in of middle part, described surface of revolution is the bimodal curve with two symmetrical convex peaks of arc along the cross section in own central axis face, is connected between described bimodal curve by wedge angle 2321.Concrete, as shown in Figure 6, described second side 232 is with the symmetrical curved surface of described central shaft OO ', is recessed into and forms described wedge angle 2321 in the middle part of it in the middle part of described lens 23.
Described first side 231 forms the light reflection that dropped into by the described plane of incidence reflecting surface to exit facet around described pit 2311 periphery, described reflecting surface is made up of jointly the side of the pyramidal structure 2312 of some even arrangements, to be realized the shooting angle repeatedly reflecting and then adjust light and the distribution character of light by the side of described pyramidal structure 2312, make beam projecting evenly, shadow-free.
As shown in Fig. 4, Fig. 6, in the embodiment of the present invention, described pyramidal structure 2312 is to the fin cone that described lens 23 outside is protruded from described first side 231, or be the recessed pyramid from described first side 231 to described lens 23 internal recess, it is in being similar to pyramidal rectangular pyramid structure, adopts the arrangement mode of rectangular array to be arranged at the periphery of described pit 2311.As a kind of embodiment, described pyramidal structure 2312 also can adopt other modes of evenly arranging such as annular array to be arranged at the periphery of the pit 2311 of described first side 231, and described pyramidal structure 2312 is also not limited only to the rectangular pyramid structure that bottom surface is quadrilateral, it also can be set to bottom surface triangular pyramid structure triangular in shape, or face, bottom surface is other polygonal pyramidal structures.
Please refer to Fig. 5, for strengthening the homogeneity of reflected light and preventing the generation of glare phenomenon, the periphery around described cone structure 2312 of described first side 231 adopts spark grain processing process to form frosted cloudy surface 2313.
As shown in Fig. 3, Fig. 4, Fig. 5, the periphery of described first side 231 is evenly provided with multiple leg 233, on described circuit board 21, correspondence is provided with fixed orifice 211, and described lens 23 are fixed on described circuit board 21 by the coupling of described leg 233 and fixed orifice 211 is affixed.In the embodiment of the present invention, the quantity of described leg 233 can be arranged according to actual conditions, is preferably set to 2 to 6, as a kind of embodiment of the best, in the embodiment of the present invention, and described leg 233 magnitude setting is 3.
During concrete installation, described lens 23 are covered at described LED lamp bead 22 outside and be placed in described pit 2311 to make described LED lamp bead 22, now, the axis of described LED lamp bead 22 is just positioned on described central shaft OO '.
Please refer to Fig. 6, the light that the dotted arrow of Fig. 6 shows the embodiment of the present invention entered by the plane of incidence and by exit facet injection process through the multiple reflections of described second side 232 and pyramidal structure 2312 and refraction time the light path trend that formed.Certainly, understandable, Fig. 6 of the embodiment of the present invention moves towards roughly to illustrate to light path, and actual injection light is by launch towards different directions and the some diffusing lights formed behind described second side 232 and the first side 231 multiple reflections and refraction are formed.
Start described backlight module, described LED lamp bead 22 is lit, and its light sent is incident upon described second side 232 by the plane of incidence of described pit 2311; The a part of light be projected on described second side 232 is refracted, most light is then reflexed to the first side 231 by described second side 232 in addition, again reflexes to described second side 232 after the pyramidal structure 2312 be arranged on described first side 231 breaks up the light reflected back; Light is described second side 232 of final injection after repetitious reflection.Because the side of described pyramidal structure 2312 forms continuous print sloping reflecter on described first side 231, and described second side 232 is overall in convex arc planar and the surface of revolution that oppositely caves in of middle part, make the distribution of light that finally penetrates through described second side 232 evenly, shadow-free.After tested, the average intensity diffusion angle of described LED lamp bead 22 can be diffused into +/-80 ° by original +/-60 ° by the backlight module of the embodiment of the present invention, namely the angle that goes out of light refraction is diffused into more than 160 ° by 140 ° of routine, and then is spread to a greater extent by the pointolite that described LED lamp bead 22 sends and become area source.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is limited by claims and equivalency range thereof.
Claims (8)
1. a backlight module, it is characterized in that, comprise pedestal and some LED lamp bar be evenly arranged on pedestal, the magnitude setting of described LED lamp bar is specially 3, each described LED lamp bar is in parallel, described LED lamp bar comprises circuit board and some LED lamp bead be arranged on described circuit board, LED lamp bead quantity in every root LED lamp bar is identical, each LED lamp bead spacing in same LED lamp bar is identical, and LED lamp bead spacing in any two adjacent LED lamp bar is different, LED lamp bead spacing in the described LED lamp bar of any two alternate settings is identical, the spacing be positioned between the LED lamp bead in middle described LED lamp bar is slightly less than the spacing between the LED lamp bead in the LED lamp bar of both sides, and the LED lamp bead density of backlight module two side ends is slightly less than the LED lamp bead density at middle part, further, described LED lamp bar also comprises the lens covering at described LED lamp bead outside, the periphery of the first side of described lens is evenly provided with multiple leg, on described circuit board, correspondence is provided with fixed orifice, and described lens are fixed on described circuit board by the coupling of described leg and described fixed orifice is affixed.
2. backlight module as claimed in claim 1, is characterized in that, quantity >=6 of the LED lamp bead in single LED lamp bar.
3. backlight module as claimed in claim 1, it is characterized in that, first side of described lens is provided with and is recessed into the pit of accommodating LED lamp bead to lens interior, the hole wall of pit forms the plane of incidence of lens, second side of lens is the smooth surface of evagination and forms the exit facet of lens, described first side is formed the reflecting surface of light reflection to exit facet around described pit, and described reflecting surface is made up of jointly the side of the pyramidal structure of some even arrangements.
4. backlight module as claimed in claim 3, is characterized in that, described pyramidal structure is from the first side to the fin cone that its outer protrudes, or is the recessed pyramid recessed to lens interior from the first side.
5. backlight module as claimed in claim 3, is characterized in that, the rectangular array arrangement of described pyramidal structure.
6. backlight module as claimed in claim 3, it is characterized in that, described pyramidal structure is rectangular pyramid structure or triangular pyramid structure.
7. backlight module as claimed in claim 3, it is characterized in that, described exit facet is overall in convex arc planar and the surface of revolution that oppositely caves in of middle part, described surface of revolution is the bimodal curve with two symmetrical convex peaks of arc along the cross section in own central axis face, is connected between described bimodal curve by wedge angle.
8. a display device, is characterized in that, comprises the backlight module according to any one of claim 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210450182.3A CN102954412B (en) | 2012-11-12 | 2012-11-12 | Display device and backlight module thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210450182.3A CN102954412B (en) | 2012-11-12 | 2012-11-12 | Display device and backlight module thereof |
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| CN102954412A CN102954412A (en) | 2013-03-06 |
| CN102954412B true CN102954412B (en) | 2015-12-16 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103542325A (en) * | 2013-06-14 | 2014-01-29 | 秦彪 | Plate-shaped solid state lighting lamp |
| CN104534365A (en) * | 2015-01-04 | 2015-04-22 | 赵立地 | Direct type backlight module light bar |
| CN105485629A (en) * | 2015-12-29 | 2016-04-13 | 李小鹏 | Double-track LED (Light-Emitting Diode) soft light |
| JP6757264B2 (en) * | 2017-01-23 | 2020-09-16 | 株式会社エンプラス | Luminous flux control member, light emitting device, surface light source device and display device |
| CN107329324A (en) * | 2017-08-30 | 2017-11-07 | 深圳创维－Rgb电子有限公司 | A kind of analog platform of down straight aphototropism mode set |
| CN112413431A (en) * | 2020-11-30 | 2021-02-26 | 惠州市盈帆实业有限公司 | Mini LED lamp plate |
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