CN102954412A - Display device and backlight module thereof - Google Patents
Display device and backlight module thereof Download PDFInfo
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- CN102954412A CN102954412A CN2012104501823A CN201210450182A CN102954412A CN 102954412 A CN102954412 A CN 102954412A CN 2012104501823 A CN2012104501823 A CN 2012104501823A CN 201210450182 A CN201210450182 A CN 201210450182A CN 102954412 A CN102954412 A CN 102954412A
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- led lamp
- backlight module
- lamp pearl
- lens
- lamp bar
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Abstract
The embodiment of the invention discloses a backlight module which comprises a base and a plurality of LED (Light Emitting Diode) lamp strips, wherein the LED lamp strips are uniformly arranged on the base and comprise a circuit and a plurality of LED lamp beads arranged on the circuit board; the quantity of the LED lamp beads on each LED lamp strip is identical; the spaces among various LED lamp beads on the same LED lamp strip are identical; the spaces between the LED lamp beads on any two adjacent LED lamp strips are different; and in addition, the density of the LED lamp beads at two side ends of the backlight module is smaller than that of the middle LED lamp bead. According to the backlight module disclosed by the embodiment of the invention, the uniform staggered arrangement of the LED lamp beads is realized by arranging a plurality of LED lamp strips provided with the LED lamp beads with different spaces in a parallel and staggered manner; and meanwhile, a plurality of pyramid structures are arranged on a reflecting surface of a lens, so that multiple reflection/refraction of light is realized. The backlight module has the advantages of simple structure, stable performance and low cost; and in addition, the integral illumination and uniformity are effectively improved.
Description
Technical field
The present invention relates to the electronic display technology field, relate in particular to a kind of display unit and backlight module thereof.
Background technology
Liquid crystal display (Liquid Crystal Display is called for short LCD) needs to use backlight module as light source because self is not luminous.Existing backlight module can be divided into two kinds of side-light backlight module and down straight aphototropism mode set usually.
Existing down straight aphototropism mode set generally forms illuminating source by some LED lamp pearl array arrangements, need use the nearly LED lamp pearl more than 500 such as 32 inch liquid crystal displays, and the employed LED lamp of undersized liquid crystal display pearl has reached more than 36 at least, numerous LED lamp pearl like this need to connect with the mode of series and parallel, control circuit is complicated, cost of manufacture is expensive, and the luminous flux utilization rate is low, and heating is serious; And, in case certain LED lamp pearl wherein damages, will cause the fault of whole down straight aphototropism mode set, numerous LED lamp pearl like this, the probability of initiating failure is very large; Simultaneously, because individual illumination has certain difference in some LED lamp pearls, for satisfying whole illumination and the uniformity, usually need utilize high-end blooming piece to strengthen brightness and the mist degree of LED lamp pearl, cause cost to increase.
Because the light source characteristic of display unit, in the situation that satisfies the global illumination uniformity, the illumination of backlight module side need be slightly less than the illumination at its middle part, and usually, the illumination of side only is 75% of middle part illumination.Traditional backlight module is normally realized by the illumination brightness of regulating LED lamp pearl, namely in the situation that LED lamp pearl is evenly arranged, dispose in addition corresponding light adjusting circuit so that the illumination brightness value of middle part LED lamp pearl greater than the LED lamp pearly-lustre of side according to brightness value, owing to need the special light adjusting circuit of configuration, circuit arrangement is complicated, and cost is high.
Summary of the invention
Embodiment of the invention technical problem to be solved is, a kind of backlight module is provided, and is simple in structure, stable performance, and cost is low.
The further technical problem to be solved of the embodiment of the invention is to provide a kind of display unit, stable performance, and cost is low.
In order to solve the problems of the technologies described above, the embodiment of the invention has proposed a kind of backlight module, comprise pedestal and some LED lamp bars that evenly is arranged on the pedestal, described LED lamp bar comprises circuit board and some LED lamp pearls that is arranged on the described circuit board, LED lamp pearl quantity on every LED lamp bar is identical, each LED lamp pearl spacing on same LED lamp bar is identical, and the LED lamp pearl spacing on any two adjacent LED lamp bars is different, and the LED lamp pearl density of backlight module two side ends is less than the LED lamp pearl density at middle part.
Further, the LED lamp pearl spacing on the LED lamp bar of any two alternate settings is identical.
Further, the quantity of described LED lamp bar 〉=3.
Further, the quantity of the LED lamp pearl on the single LED lamp bar 〉=6.
Further, described LED lamp bar also comprises the lens that cover at described LED lamp pearl outside, the first side of described lens is provided with to the pit of lens internal recess with accommodating LED lamp pearl, the hole wall of pit consists of the plane of incidence of lens, the second side of lens is the smooth surface of evagination and the exit facet that consists of lens, described the first side forms the reflecting surface of light reflection to exit facet around described pit, and described reflecting surface is made of jointly the side of some pyramidal structures of evenly arranging.
Further, described pyramidal structure is to bore to the outside fin that protrudes of lens from the first side, perhaps is to the recessed pyramid of lens internal recess 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 the whole planar and reverse surface of revolution that caves in middle part of convex arc that is, and described surface of revolution is the bimodal curve with protruding peak of arc of two symmetries along the cross section of axial plane in self, is connected by wedge angle between the described bimodal curve.
Correspondingly, the embodiment of the invention also provides a kind of display unit, comprises aforesaid backlight module.
The beneficial effect of the embodiment of the invention is: be set to difference by the spacing between the LED lamp pearl on adjacent two LED lamp bars, realize the staggered of LED lamp pearl, under the prerequisite that satisfies illumination and the uniformity, reduce LED lamp pearl quantity, simple in structure, stable performance, cost is low; Some pyramidal structures are set in the first side of lens and jointly form the reflecting surface of lens by the cone wall of pyramidal structure, refraction angle is larger, and bright dipping is more even, the illumination of Effective Raise integral body and the uniformity.
Description of drawings
Fig. 1 is the structural representation of the backlight module of the embodiment of the invention.
Fig. 2 is that backlight module shown in Figure 1 is along the cross-sectional view of A-A direction.
Fig. 3 is the structural representation of the LED lamp bar of the embodiment of the invention.
Fig. 4 is the stereogram of the lens of the embodiment of the invention.
Fig. 5 is the structural representation of the lens of the embodiment of the invention.
Fig. 6 is that lens shown in Figure 5 are along the cross-sectional view of B-B direction.
The specific embodiment
Need to prove that in the situation of not conflicting, embodiment and the feature among the embodiment among the application can mutually combine, and below in conjunction with the drawings and specific embodiments the present invention are described in further detail.
Such as Fig. 1 ~ shown in Figure 6, the embodiment of the invention provides a kind of backlight module and is provided with the display unit of this backlight module.
Please refer to Fig. 1, Fig. 2, described backlight module comprises pedestal 10 and some LED lamp bars 20 that evenly is arranged in the described pedestal 10.
Described pedestal 10 is made of a base plate 11 and four side plates 12, described side plate 12 outward-dipping and and 11 of described base plates form the obtuse angle, its be used for accommodating fixing described LED lamp bar 20 and with the light of described LED lamp bar 20 emissions upwards reflection to form the backlight of described display unit.As a kind of better embodiment, the angle number of degrees that described base plate 11 and side plate are 12 are preferably 135 ° ~ 140 °.
In the embodiment of the invention, described LED lamp bar 20 magnitude settings are preferably more than 3 or 3, and on the equidistant base plate 11 that is arranged in side by side described pedestal 10, each described LED lamp bar 20 is in parallel with the light emitting source of the described backlight module of common formation.
As shown in Figure 3, described LED lamp bar 20 specifically comprises circuit board 21 and some LED lamp pearls 22 that is arranged on the described circuit board 21.For guaranteeing the uniformity of described backlight module illumination, in the embodiment of the invention, LED lamp pearl on the single described LED lamp bar 20 22 is equidistant evenly arranges; Simultaneously, have enough illumination for guaranteeing described backlight module, the quantity of the LED lamp pearl 22 on the single described LED lamp bar 20 reaches more than 6 or 6.
In the embodiment of the invention, described backlight module satisfies display unit to the specific (special) requirements of intensity of illumination and the uniformity by the density of arranging of regulating described LED lamp pearl 22.Please refer to Fig. 1, Fig. 2, LED lamp pearl 22 spacings on any two adjacent LED lamp bars 20 of described backlight module are set to different value, so that the LED lamp pearl 22 on two adjacent LED lamp bars 20 is staggered mutually, and the density of the LED lamp pearl 22 at its middle part is greater than the density of the LED lamp pearl 22 of two side ends, so that illumination and then guarantees the illumination uniformity of described backlight module integral body greater than the illumination of two side ends in the middle of it.
When the quantity of the bar of LED lamp described in the same backlight module 20 is set to 3 or 3 when above, the spacing of the LED lamp pearl 22 on the described LED lamp bar 20 of any two alternate settings is identical to guarantee the whole uniformity of described backlight module.
As shown in Figure 1, as a kind of preferred embodiment, the magnitude setting of the described LED lamp bar 20 in the embodiment of the invention is specially 3, the quantity of LED lamp pearl 22 on every described LED lamp bar 20 all is set to 6, and each LED lamp pearl 22 spacing on same LED lamp bar 20 are identical, and the sum of the LED lamp pearl 22 that namely arranges in the backlight module shown in the embodiment of the invention amounts to 18.When the described LED lamp pearl 22 of configuration, the power of single described LED lamp pearl 22 is 1.2W, and the electric current of single described LED lamp pearl 22 is 400mA.Please continue with reference to figure 1, when described LED lamp bar 20 specifically is set, the spacing that LED lamp pearl on two LED lamp bars 20 in the outer part is 22 equates, and the spacing of 22 on the LED lamp pearl on the LED lamp bar 20 in the middle of being positioned at is slightly less than the spacing of 22 on LED lamp pearl on the both sides LED lamp bar 20.As shown in Figure 2, when adopting this kind mode to arrange, the density of described backlight module middle part LED lamp pearl 22 is slightly larger than the density of its two side ends LED lamp pearl 22, in by the identical situation of the electric current of each LED lamp pearl 22, the overall brightness value at its middle part can be slightly larger than the brightness value of its side to satisfy display unit to the specific (special) requirements of backlight module illumination.The described backlight module of the embodiment of the invention, reducing LED lamp pearl 22 quantity and do not setting up separately in the situation of light adjusting circuit, can satisfy equally the designing requirement of backlight module illumination and the uniformity, simple in structure, cost of manufacture is low, and because LED lamp pearl 22 quantity reduce, its probability that breaks down also decreases, and performance is more reliable and more stable.
Please refer to Fig. 3, described LED lamp pearl 22 outer cup are provided with lens 23, described lens 23 spread to greatest extent as the light source that a kind of optical element is used for described LED lamp pearl 22 is launched, in the embodiment of the invention, described lens 23 roughly are hemispherical, made by the transparent optical material, such as acrylic polymer, high molecular polymer, macromolecule carbon compound, glass or quartz etc.
Such as Fig. 4 ~ shown in Figure 6, described lens 23 comprise the first side 231 and the second side 232 that is connected.
Described the first side 231 is described lens 23 and described circuit board 21 contacted end faces, its middle part is provided with the pit 2311 with accommodating described LED lamp pearl 22 to described lens 23 internal recess, and the hole wall of described pit 2311 consists of the plane of incidence of described lens 23.
Described the second side 232 is the smooth surface of evagination, and consists of the exit facet of described lens 23.In the embodiment of the invention, described the second side 232 is the whole planar and reverse surface of revolution that caves in middle part of convex arc that is, described surface of revolution is the bimodal curve with protruding peak of arc of two symmetries along the cross section of axial plane in self, is connected by wedge angle 2321 between the described bimodal curve.Concrete, as shown in Figure 6, described the second side 232 is with the symmetrical curved surface of described central shaft OO ', its middle part is the described wedge angle 2321 of recessed formation towards described lens 23 middle parts.
The light reflection that described the first side 231 will be dropped into by the described plane of incidence around described pit 2311 peripheral formations is to the reflecting surface of exit facet, described reflecting surface is made of jointly the side of some pyramidal structures of evenly arranging 2312, realize the shooting angle that repeatedly reflects and then adjust light and the distribution character of light with the side by described pyramidal structure 2312, make beam projecting evenly, shadow-free.
Such as Fig. 4, shown in Figure 6, in the embodiment of the invention, described pyramidal structure 2312 is to the described lens 23 outside fin cones that protrude from described the first side 231, it perhaps is the recessed pyramid to described lens 23 internal recess from described the first side 231, it is and is 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 the first side 231, and also being not limited only to the bottom surface, described pyramidal structure 2312 is tetragonal rectangular pyramid structure, it also can be set to bottom surface triangular pyramid structure triangular in shape, and perhaps the bottom surface face is other polygonal pyramidal structures.
Please refer to Fig. 5, for strengthening catoptrical uniformity and preventing the generation of glare phenomenon, the periphery around described cone structure 2312 of described the first side 231 adopts the spark grain processing process to form frosted cloudy surface 2313.
Such as Fig. 3, Fig. 4, shown in Figure 5, the periphery of described the first side 231 evenly is provided with a plurality of legs 233, correspondence is provided with fixing hole 211 on the described circuit board 21, and described lens 23 are fixed on the described circuit board 21 by the coupling of described leg 233 and fixing hole 211 is affixed.In the embodiment of the invention, the quantity of described leg 233 can arrange according to actual conditions, preferably is set to 2 to 6, and as a kind of embodiment of the best, in the embodiment of the invention, described leg 233 magnitude settings are 3.
During concrete the installation, described lens 23 are covered at described LED lamp pearl 22 outsides so that described LED lamp pearl 22 is placed in the described pit 2311, at this moment, the axis of described LED lamp pearl 22 just is positioned on the described central shaft OO '.
Please refer to Fig. 6, the light that the dotted arrow of Fig. 6 shows the embodiment of the invention entered by the plane of incidence and by in the exit facet ejaculation process when the Multi reflection of described the second side 232 and pyramidal structure 2312 and the refraction formed light path trend.Certainly, understandable, Fig. 6 of the embodiment of the invention moves towards to do roughly signal to light path, and the actual light that penetrates is made of some diffusing lights of launching towards different directions and form after described the second side 232 and the first side 231 Multi reflections and refraction.
Start described backlight module, described LED lamp pearl 22 is lit, and its light that sends is incident upon described the second side 232 by the plane of incidence of described pit 2311; The a part of light that is projected on described the second side 232 is refracted, most light is then reflexed to the first side 231 by described the second side 232 in addition, is arranged at again to reflex to described the second side 232 after pyramidal structure 2312 on described the first side 231 is broken up the light that reflects back; Light is described the second side 232 of final ejaculation after repetitious reflection.Because the side of described pyramidal structure 2312 forms continuous sloping reflector on described the first side 231, and described the second side 232 is the surface of revolution that convex arc is planar and oppositely cave in the middle part for integral body, so that even, the shadow-free of distribution of light that finally penetrates through described the second side 232.After tested, the backlight module of the embodiment of the invention can with the average intensity of described LED lamp pearl 22 diffusion angle by original+/-60 ° be diffused into+/-80 °, being the angle that goes out of light refraction is diffused into more than 160 ° by 140 ° of routine, and then the spot light that described LED lamp pearl 22 sends spread to a greater extent becomes area source.
Although illustrated and described embodiments of the invention, for the ordinary skill in the art, be appreciated that without departing from the principles and spirit of the present invention and can carry out multiple variation, modification, replacement and modification to these embodiment, scope of the present invention is limited by claims and equivalency range thereof.
Claims (10)
1. backlight module, it is characterized in that, comprise pedestal and some LED lamp bars that evenly is arranged on the pedestal, described LED lamp bar comprises circuit board and some LED lamp pearls that is arranged on the described circuit board, LED lamp pearl quantity on every LED lamp bar is identical, each LED lamp pearl spacing on same LED lamp bar is identical, and the LED lamp pearl spacing on any two adjacent LED lamp bars is different, and the LED lamp pearl density of backlight module two side ends is less than the LED lamp pearl density at middle part.
2. backlight module as claimed in claim 1 is characterized in that, the LED lamp pearl spacing on the LED lamp bar of any two alternate settings is identical.
3. backlight module as claimed in claim 2 is characterized in that, the quantity of described LED lamp bar 〉=3.
4. backlight module as claimed in claim 1 is characterized in that, the quantity of the LED lamp pearl on the single LED lamp bar 〉=6.
5. backlight module as claimed in claim 1, it is characterized in that, described LED lamp bar also comprises the lens that cover at described LED lamp pearl outside, the first side of described lens is provided with to the pit of lens internal recess with accommodating LED lamp pearl, the hole wall of pit consists of the plane of incidence of lens, the second side of lens is the smooth surface of evagination and the exit facet that consists of lens, described the first side forms the reflecting surface of light reflection to exit facet around described pit, and described reflecting surface is made of jointly the side of some pyramidal structures of evenly arranging.
6. backlight module as claimed in claim 5 is characterized in that, described pyramidal structure is to bore to the outside fin that protrudes of lens from the first side, perhaps is to the recessed pyramid of lens internal recess from the first side.
7. backlight module as claimed in claim 5 is characterized in that, the rectangular array arrangement of described pyramidal structure.
8. backlight module as claimed in claim 5 is characterized in that, described pyramidal structure is rectangular pyramid structure or triangular pyramid structure.
9. backlight module as claimed in claim 5, it is characterized in that, described exit facet is the whole planar and reverse surface of revolution that caves in middle part of convex arc that is, described surface of revolution is the bimodal curve with protruding peak of arc of two symmetries along the cross section of axial plane in self, is connected by wedge angle between the described bimodal curve.
10. a display unit is characterized in that, comprises such as each described backlight module in the claim 1 to 9.
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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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| 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 true CN102954412A (en) | 2013-03-06 |
| CN102954412B CN102954412B (en) | 2015-12-16 |
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| 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 | A dual-track LED soft light |
| 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 |
| CN110235054A (en) * | 2017-01-23 | 2019-09-13 | 恩普乐股份有限公司 | Flux control member, light emitting device, planar light source device and display device |
| CN112413431A (en) * | 2020-11-30 | 2021-02-26 | 惠州市盈帆实业有限公司 | Mini LED lamp plate |
| CN113623610A (en) * | 2020-05-08 | 2021-11-09 | 华域视觉科技(上海)有限公司 | Optical element, vehicle lamp and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103542325A (en) * | 2013-06-14 | 2014-01-29 | 秦彪 | Plate-shaped solid state lighting lamp |
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| 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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| CN102954412B (en) | 2015-12-16 |
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