CN204477931U - A kind of direct-light type LED backlight illumination light-distribution lens, system and a kind of TV - Google Patents
A kind of direct-light type LED backlight illumination light-distribution lens, system and a kind of TV Download PDFInfo
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- CN204477931U CN204477931U CN201520109152.5U CN201520109152U CN204477931U CN 204477931 U CN204477931 U CN 204477931U CN 201520109152 U CN201520109152 U CN 201520109152U CN 204477931 U CN204477931 U CN 204477931U
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Abstract
The utility model relates to backlighting technology field, specifically refers to a kind of direct-light type LED backlight illumination light-distribution lens, system and a kind of TV.Comprise lens body, described lens body comprises the plane of incidence, exit facet and bottom composite surface, described bottom composite surface comprises at least two sub-composite surfaces, and described sub-composite surface prolongs the normal of any point and the central shaft of described lens body on hatching that lens body central axis direction cuts open and intersects at the below of lens body; Be connected by non-working surface between described sub-composite surface; The sub-composite surface of described bottom composite surface and non-working surface form zigzag endless belt; The part Fresnel boundary reflection light reflected through described exit facet reflects away to the direction of departing from lens body central shaft by described sub-composite surface, reduces the accumulation of lens upper center zonal ray; Simultaneously by the bottom composite surface design of sawtooth endless belt, save space, in less space, solve the offering question of sub-composite surface, have compressed the structure of lens.
Description
Technical field
The utility model relates to backlighting technology field, specifically refers to a kind of direct-light type LED backlight illumination light-distribution lens, system and a kind of TV.
Background technology
The back lighting mode of the LED-backlit illumination of present liquid crystal display television and LED panel lamp etc. has two kinds usually with light structures: a kind of side (LED light axle is substantially vertical with light guide plate side) for plurality of LEDs being placed on light guide plate, the light that LED sends enters into light guide plate through light guide plate side, there is multiple total reflection and refraction in light guide plate after, finally all light transmits through the front of light guide plate, by accurately controlling light guide plate reflection and the ratio of refraction, uniform exiting surface can be formed in light guide plate front; This mode is often referred to as side entering type lighting system.
Another plurality of LEDs light source is placed on the diffuser plate back side (in this method, LED light axle is substantially vertical with the diffuser plate back side), in order to the irradiation of uniform light sent by LED is at the diffuser plate back side, need between each LED and diffuser plate, place a secondary light-distribution lens, after the light that LED sends by light-distribution lens carries out secondary distribution, be radiated at the back side of diffuser plate uniformly; Such light enters into diffuser plate inside through the diffuser plate back side and spreads again, goes out to shoot out from the front of diffuser plate, and can form uniform exiting surface in diffuser plate front, this mode is often referred to as straight-down negative lighting system.
Above-mentioned two kinds of lighting systems are compared, and form same lighting area, and the light travel path of side entering type is much larger than straight-down negative, and the light extraction efficiency of side entering type is low, so adopt, its energy consumption of lighting system of side entering type is high, cost is high.
In recent years along with further application and the popularization of the LED-backlit illumination of display (such as flat panel television display) and the product of LED panel lamp etc.The power conservation requirement of corresponding product and the demand of cost control are also come urgently; Traditional side entering type lighting system that under such background, efficiency is lower is progressively being replaced by straight-down negative lighting system.
The development trend of current LED downward back optical illumination is: under the prerequisite as far as possible increasing the spacing (mainly in order to reduce LED quantity in same area) between LED, reduce the thickness (mainly in order to reduce system bulk) from LED light source to diffuser plate, also will ensure the uniformity of irradiating simultaneously.This has higher requirement to light-distribution lens.
In prior art, in order to increase the spacing between LED, compress the distance between LED and diffuser plate simultaneously, as shown in Figure 1, some straight-down negative systems adopt reflective lens to carry out secondary distribution to the light that LED sends, light 120 scioptics 130 allowing the LED110 of considerable part send reflex on the reflector layer 140 on system inner chamber, and then to reflex on diffuser plate 150.Although this lighting system can reduce spatial altitude, the characteristic of reflector layer is relied on comparatively large, require higher to the surface precision of lens and the smooth depth of installation accuracy and reflector layer etc. simultaneously, therefore more difficultly realize Uniform Illumination.
The straight-down negative system also had now adopts refraction type lens to carry out secondary distribution to the light that LED sends, but be difficult to spacing distance between LED large and the spacing of LED and diffuser plate is little realize Uniform Illumination.
Major reason is light when propagating in different medium, and light is by always also existing Fresnel boundary reflection during interface, and the larger Fresnel boundary reflection effect of incident angle is more obvious.When usually propagating from optically thinner medium to optically denser medium, after incidence angle is greater than 60 °, the increase along with incidence angle is risen by its Fresnel boundary reflection rate; From optically denser medium to optically thinner medium, during transmission, Fresnel boundary reflection is then more remarkable, and after incidence angle is greater than 30 °, the increase along with incidence angle is sharply risen by its Fresnel boundary reflection rate.
The light sent from LED light source enters lens body after the refraction of the plane of incidence, when reaching exit facet, some light reflects away through exit facet, and in addition some light by boundary reflection to lens interior, this part reflection ray is after the multiple reflections and refraction of lens base or system inner chamber reflecting surface etc. multiple, above LED, gathering of light (energy) can be formed by mid portion region, have a strong impact on the uniformity of lens outgoing light field.
With reference in figure 2, sent the light 231 entering lens 220 by the LED light source 210 be positioned at below the plane of incidence and can be separated when arriving exit facet 223, become refracted ray 232 and Fresnel reflected rays 233.Usual refracted ray 232 can carry most of energy and directly be mapped to diffuser plate 250, Fresnel reflected rays 233 then can be carried small part energy and is reflected back lens interior, then through bottom lens body 222 or lens body bottom under reflections off objects after form secondary reflection light 234, reflect lens when secondary reflection light 234 encounters exit facet 223 again and become light 235, light 235 is advanced after stretch journey and is arrived diffuser plate 250.Can find out that light 235 can by mid portion region gather above LED210 by light course.Because light 231 is enter optically thinner medium by optically denser medium when arriving exit facet 223, therefore Fresnel boundary reflection effect is comparatively obvious, there is higher reflectivity, therefore the phenomenon leaning on mid portion zonal ray (energy) to gather above the LED210 caused due to Fresnel boundary reflection is comparatively remarkable, finally has influence on the uniformity of back lighting.
The volume of backlight lens of the prior art is often very little simultaneously, will be reflected away by Fresnel boundary reflection light in limited bottom space towards the direction of departing from lens body central shaft, structure is difficult to realize.
Utility model content
In order to solve the problem, the utility model provides a kind of direct-light type LED backlight illumination light-distribution lens, can in the limited space of lens, reduce the accumulation of the emergent ray caused by Fresnel boundary reflection in center light field, reasonable layout emergent ray, the usage quantity that can reduce the LED light source on LED-backlit panel under the prerequisite realizing same illuminating effect can also realize the thickness reduced from LED light source to diffuser plate simultaneously, reduces the volume of system.
In order to realize above-mentioned technique effect, the utility model takes following technical scheme:
In order to overcome the above problems, the utility model proposes a kind of direct-light type LED backlight illumination light-distribution lens, comprise lens body, wherein said lens body comprises exit facet, the plane of incidence and bottom composite surface;
Described bottom composite surface is positioned at the bottom of described lens body, is connected with the described plane of incidence near the side of lens body central shaft; The described plane of incidence is positioned at the bottom centre of described lens body, caves in lens body top-direction;
Described bottom composite surface comprise at least two sub-composite surfaces, between described sub-composite surface by non-working surface be connected; The sub-composite surface of described bottom composite surface and non-working surface form zigzag endless belt, when described sub-composite surface is cut open along scioptics body central direction of principal axis, on the hatching of sub-composite surface, the central shaft of the normal of any point in section and described lens body intersects at the below of lens body;
The hatching length of described sub-composite surface is greater than the hatching length of the non-working surface be adjacent.
Due to the angle of sub-composite surface, the Fresnel boundary reflection light reflected by described exit facet reflects away to the direction away from lens body central shaft, significantly reduce the accumulation of the light source upper area light caused by Fresnel boundary reflection light like this, add the intensity of the light field departing from lens centre, improve the even photosensitiveness of outgoing light field.And, the sub-composite surface in described bottom crosses the section of described lens body central shaft, cut formation open hatching be zigzag, this broached-tooth design, can save space, can in less bottom space, the offering question of the sub-composite surface of good solution, reduce the thickness of lens, the volume of compression lens, well achieves the technique effect reflected away towards the direction of departing from lens body central shaft by Fresnel boundary reflection light.
Preferred as one, the angle of described non-working surface and lens base is between 70 ° to 90 °; The saw-tooth ring formed in above-mentioned angular range farthest can ensure the effective area of sub-composite surface, also facilitates the demoulding in lens body production process simultaneously.
Preferred as one, the sawtooth root of the saw-tooth profile line of described bottom composite surface is located on the same line, and this sawtooth root is simple at the project organization of same straight line, and convenient processing and the manufacturing, reduce production cost.
Further, the sawtooth root in the composite surface jagged line of described bottom is positioned at same plane, the central axis of this straight line and lens body; Namely bottom described lens body, the sub-composite surface root of composite surface is positioned at the same plane bottom lens body, and such structural design structure is simple.
Preferred as one, when described bottom composite surface is cut open along scioptics body central direction of principal axis, sawtooth root on the saw-tooth profile line of sub-composite surface is located along the same line, the central shaft of this straight line and described lens body tilts, and the central shaft of the normal of this straight line and described lens body intersects at the bottom part down of described lens body, like this, be equivalent to all serrated faces to be positioned in a large inclined plane, better can realize the effect reflected away to the direction of departing from lens body central shaft by the Fresnel boundary reflection light through reflecting from exit facet.
Preferred as one, when described bottom composite surface is cut open along scioptics body central direction of principal axis, the sawtooth root on the saw-tooth profile line of sub-composite surface is positioned on curve, can design sub-composite surface more neatly like this, makes lens reach better light distribution effect.
Further, described sub-composite surface hatching is straight line; Sub-composite surface is like this that the project organization of taper seat is simple, and convenient processing and the manufacturing, reduce production cost.
Further, the hatching of described sub-composite surface is curve, and sub-composite surface is the design of curved surface, can design sub-composite surface more neatly like this, makes lens reach better light distribution effect.
Further, described sub-composite surface is identical with the angle of inclination of described lens body bottom surface; Identical angle of inclination, facilitates processing and fabricating, lowers production cost.
Preferred as one, the angle of described sub-composite surface and described lens body bottom surface, increases successively near the direction of lens body axis.The design that this angle of inclination reduces successively, better can reflect away the light near lens body central Fresnel reflection concentrated area with the direction of more departing from lens body central shaft, be conducive to the light reduced further near lens axis and pile up.Better even light effect can be realized.
Further, the length of the hatching of described each sub-composite surface is equal, and the bottom composite surface of described lens body is evenly distributed; This equally distributed sub-composite surface design, structure is simple, is convenient to processing and makes, and is conducive to lowering production cost.
Preferred as one, the length of the hatching of described sub-composite surface increases successively along the direction to lens body central shaft.More sparse near the distribution of crossing lens body center, and the position distribution at close lens body edge is more intensive; This outer close inner thin reflection endless belt design can reduce non-working surface outside lens to the interference of the sub-composite surface institute reflection ray of adjacent close lens inboard.
Further, when described lens use, the exiting surface of LED flushes or higher than the bottom surface of the plane of incidence.Can make like this these lens use light source to send the refraction of light all after the plane of incidence after enter lens body, reduce the loss of light or light and enter caused by lens body from other faces and harasses, improve the efficiency of light energy utilization of light source.
Preferred as one, in order to improve the even photosensitiveness of outgoing light field further, sub-composite surface is set to hair side.The principal direction of the light reflected through sub-composite surface so does not change, or reflect towards design away from the direction of described lens body central shaft, but the even photosensitiveness of reflection ray is further improved, be conducive to improving the regular secondary reflection that reflected by sub-composite surface and cause in diffuser plate glazed thread phenomenon pockety.
This patent provides a kind of system further, and comprise the LED light source that is arranged on pcb board and be arranged on to realize the lens of secondary light-distribution above LED light source, described lens are above-mentioned direct-light type LED backlight illumination light-distribution lens.Such system can be implemented in same lighting area and under the prerequisite of same illuminance uniformity, increase the distance between LED light source, reduce LED quantity, and shorten the distance between LED light source and diffuser plate, the cost of direct-light type LED backlight illuminator is declined, volume-diminished.
This patent also provides a kind of TV, comprises said system.
the utility model has following beneficial effect:
The bottom surface of the lens body of the straight-down negative secondary light-distribution lens in the utility model comprises bottom composite surface, described bottom composite surface comprise at least two sub-composite surfaces, be connected by non-working surface between described sub-composite surface; The hatching of described bottom composite surface is zigzag; Described sub-composite surface prolongs the normal of any point and the central shaft of described lens body on hatching that lens body central axis direction cuts open and intersects at the below of lens body.Fresnel boundary reflection light through exit facet is reflected away to the direction of departing from lens body central shaft, effectively reduce the accumulation of the lens body top center low-angle light caused by Fresnel boundary reflection light, add the luminous intensity of the light field departing from lens centre; The broached-tooth design of the light-distribution lens of this Novel straight down type LED-backlit illumination simultaneously, space can be saved, can in less bottom space, the offering question of the sub-composite surface of good solution, reduce the thickness of lens, the volume of compression lens, well achieves the technique effect reflected away towards the direction of departing from lens body central shaft by Fresnel boundary reflection light; Under realizing the prerequisite of same illuminance uniformity in same lighting area and on diffuser plate, increase the distance between LED light source, reduce LED quantity, and shorten the distance between LED light source and diffuser plate, the cost of direct-light type LED backlight illuminator is declined, volume-diminished.
Accompanying drawing explanation
Fig. 1 is reflective backlight lens combination schematic diagram in prior art.
Fig. 2 is the system schematic of refraction type backlight lens in prior art.
Fig. 3 is this Novel straight down type LED-backlit illumination light-distribution lens stereoscopic and partly cuts open structure chart.
Fig. 4 is the enlarged diagram of the composite surface section local, bottom of Fig. 3.
Fig. 5 is the generalized section of the bottom composite surface of this Novel straight down type LED-backlit illumination light-distribution lens.
Fig. 6 is the perspective view of embodiment 1.
Fig. 7 is the generalized section of embodiment 1.
Fig. 8 is the upward view of embodiment 1.
Fig. 9 is the perspective view of embodiment 2.
Figure 10 is the generalized section of embodiment 2.
Detailed description of the invention
Below in conjunction with drawings and Examples, describe the technical solution of the utility model in detail.
The utility model takes following technical scheme: the utility model provides a kind of direct-light type LED backlight illumination light-distribution lens, the accumulation of Fresnel boundary reflection light in illumination light field central area can be reduced, improve the even photosensitiveness of outgoing light field, the usage quantity of the light source on LED-backlit panel can be reduced under the prerequisite realizing same illumination uniformity, the thickness reduced from LED light source to diffuser plate can also be realized simultaneously, reduce the volume of system.
In order to realize above-mentioned technique effect, the utility model takes following technical scheme:
In order to overcome the above problems, the utility model proposes a kind of direct-light type LED backlight illumination light-distribution lens, as shown in Figure 3, comprise lens body 300, wherein said lens body 300 comprises exit facet 302, the plane of incidence 301 and bottom composite surface 303; Described exit facet 302, the plane of incidence 301 and bottom composite surface 303 are all coaxial with lens body 300;
Wherein said exit facet 302 is positioned at the outer surface of described lens body 300, and the bottom of described exit facet 300 is connected with the bottom composite surface 303 of described lens body 300 (also can be connected with bottom composite surface 303 through side 304);
Described bottom composite surface is positioned at the bottom of described lens body 303, is connected with the described plane of incidence 301 near the side of lens body 300 central shaft;
The described plane of incidence 301 is positioned at the bottom centre of described lens body 300, caves in lens body 300 top-direction.
Described exit facet 302, the plane of incidence 301 and bottom composite surface 303 are corresponding bus and rotate and the axisymmetric shape of formation around Lens body 300 central shaft.(enlarged diagram of the local A of described bottom composite surface 303 as shown in Figure 4)
Further, described bottom composite surface 303 comprise at least two sub-composite surface 303-1, described sub-composite surface 303-1 is along the section of scioptics body central axle, and on the hatching cut open, the normal FF ' of any point and the central shaft OO ' of described lens body intersect at the below (as shown in Figure 5) of lens body.
Further, described bottom composite surface comprises at least two sub-composite surface 303-1, is connected between described sub-compound 303-1 face by non-working surface 303-2; Described bottom composite surface 303 through the section of described lens body central shaft, cut the hatching of formation open for zigzag (as shown in Fig. 3, Fig. 4 and Fig. 5); Each sawtooth comprises the hatching of described non-working surface and adjacent sub-composite surface; This broached-tooth design, space can be saved, can in less bottom space, the offering question of the sub-composite surface of good solution, reduce the thickness of lens, the volume of compression lens, well achieves the technique effect reflected away towards the direction of departing from lens body central shaft by Fresnel boundary reflection light.
In addition, further cooperated with LED exiting surface with flush bottom the plane of incidence or exceed bottom the plane of incidence, can make like this these lens use light source to send the refraction of light all after the plane of incidence after enter lens body, the loss of minimizing light or light enter caused by lens body from other faces harasses, and improves the efficiency of light energy utilization of light source.
Preferred as one, the angle (as shown in Fig. 4 label 303-3) of described non-working surface 303-2 and lens base is between 70 ° to 90 °; The saw-tooth ring formed in above-mentioned angular range farthest can ensure the effective area of sub-composite surface, also facilitates the demoulding in lens body production process simultaneously.
Preferred as one, the sawtooth root of the saw-tooth profile line of described bottom composite surface is located on the same line, and this sawtooth root is simple at the project organization of same straight line, and convenient processing and the manufacturing, reduce production cost.
Further, the sawtooth root in the composite surface jagged line of described bottom is positioned at same plane, the central axis of this straight line and lens body; Namely bottom described lens body, the sub-composite surface root of composite surface is positioned at the same plane bottom lens body, and such structural design structure is simple.
Preferred as one, when described bottom composite surface is cut open along scioptics body central direction of principal axis, sawtooth root on the saw-tooth profile line of sub-composite surface is located along the same line, the central shaft of this straight line and described lens body tilts, and intersect at the bottom part down of described lens body with the central shaft of described lens body, like this, being equivalent to all serrated faces to be positioned in a large inclined plane, better can realizing the effect reflected away to the direction of departing from lens body central shaft by the Fresnel boundary reflection light through reflecting from exit facet.
Preferred as one, when described bottom composite surface is cut open along scioptics body central direction of principal axis, the sawtooth root on the saw-tooth profile line of sub-composite surface is positioned on curve, can design sub-composite surface more neatly like this, makes lens reach better light distribution effect.
Further, described sub-composite surface hatching is straight line; Sub-composite surface is like this that the project organization of taper seat is simple, and convenient processing and the manufacturing, reduce production cost.
Further, the hatching of described sub-composite surface is curve, and sub-composite surface is the design of curved surface, can design sub-composite surface more neatly like this, makes lens reach better light distribution effect.
Further, described sub-composite surface is identical with the angle of inclination of described lens body bottom surface; Identical angle of inclination, facilitates processing and fabricating, lowers production cost.
Preferred as one, the angle of described sub-composite surface and described lens body bottom surface, increases successively near the direction of lens body axis.The design that this angle of inclination reduces successively, better can reflect away the light near lens body central Fresnel reflection concentrated area with the direction of more departing from lens body central shaft, be conducive to the light reduced further near lens axis and pile up.Better even light effect can be realized.
Further, the length of the hatching of described each sub-composite surface is equal, and the bottom composite surface of described lens body is evenly distributed; This equally distributed sub-composite surface design, structure is simple, is convenient to processing and makes, and is conducive to lowering production cost.
Preferred as one, the length of the hatching of described sub-composite surface increases successively along the direction to lens body central shaft.More sparse near the distribution of crossing lens body center, and the position distribution at close lens body edge is more intensive; This outer close inner thin reflection endless belt design can reduce non-working surface outside lens to the interference of the sub-composite surface institute reflection ray of adjacent close lens inboard.
Preferred as one, in order to improve the even photosensitiveness of outgoing light field further, sub-composite surface is set to hair side.The principal direction of the light reflected through sub-composite surface so does not change, or reflect towards design away from the direction of described lens body central shaft, but the even photosensitiveness of reflection ray is further improved, and is conducive to improving the regular secondary reflection of Fresnel reflection light reflected by sub-composite surface and the non-uniform phenomenon on diffuser plate caused.
Further, in order to ensure that described lens and LED light source are installed accurately and light-distribution lens easy to assembly, the bottom surface of lens and side are provided with positioner.
Further, in order to realize the accurate positioning of the installation of lens and LED light source panel and improve installation effectiveness, simplification installation process, at the correspondence position of LED panel corresponding to lens or pcb board, is provided with the corresponding positioner that described positioner matches.
Further, described positioner, is arranged on the marginal position bottom described lens, can be the bottom margin being set directly at lens body, also can be the position arranging positioner in the bottom outside of described lens body specially.
Further, the positioner of described lens body and described lens body one-body molded.
This patent provides a kind of system further, and comprise the LED light source that is arranged on pcb board and be arranged on to realize the lens of secondary light-distribution above LED light source, described lens are above-mentioned direct-light type LED backlight illumination light-distribution lens.Such system can in same lighting area and under the prerequisite of same illuminance uniformity, realize increasing the distance between LED light source, reduce LED quantity, and shorten the distance between LED light source and diffuser plate, the cost of direct-light type LED backlight illuminator is declined, volume-diminished.
Further, described system also comprises diffuser plate, and described diffuser plate is arranged on the front of described lens.The light that LED light source on pcb board can further send by the application of described diffuser plate is better, evenly be diffused into exiting surface.
Further, described system also comprises reflecting layer, and described reflecting layer is positioned at the front of described pcb board and described pcb board fits tightly; Although refraction type secondary light-distribution lens is very low to the degree of dependence in reflecting layer in use the utility model, the use in reflecting layer can improve the optical energy utilization efficiency of backlight illuminating system better, reaches energy-saving effect well.
The utility model also provides a kind of TV, comprises said system.
The utility model also comprises a kind of panel light, comprises said system.
The utility model is not limited to aforesaid detailed description of the invention.The utility model expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Embodiment 1
The bottom composite surface that backlight lens in the present embodiment comprise comprises 6 sub-composite surfaces, the hatching of described bottom composite surface is zigzag, the sawtooth root of the hatching of described bottom composite surface is located along the same line, and the central shaft of this straight line and lens body described in the present embodiment is to vertical; And the hatching of described sub-composite surface is linear structure, moreover described sub-composite surface is the closer to the denser arrangement mode in lens body edge, and as shown in Fig. 6, Fig. 7, Fig. 8, (wherein Fig. 6 is the perspective view of the present embodiment; Fig. 7 is the generalized section of the present embodiment; Fig. 8 is the upward view of the present embodiment), all the other structures of the present embodiment and operation principle identical with above-mentioned detailed description of the invention, do not repeat them here.
Embodiment 2
The bottom composite surface that backlight lens in the present embodiment comprise comprises 6 sub-composite surfaces, the hatching of described bottom composite surface is zigzag, the sawtooth root of the hatching of described bottom composite surface is positioned on curve, and on this curve, any point is larger the closer to the distance of its distance lens base of lens body central shaft; And the hatching of described sub-composite surface is linear structure, moreover described sub-composite surface is the closer to the denser arrangement mode in lens body edge, (wherein Fig. 9 is the schematic perspective view of the present embodiment as shown in Figure 9 and Figure 10, Figure 10 is the generalized section of the present embodiment), all the other structures of the present embodiment and operation principle identical with above-mentioned detailed description of the invention, do not repeat them here.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (10)
1. a direct-light type LED backlight illumination light-distribution lens, comprises lens body, and wherein said lens body comprises exit facet, the plane of incidence and bottom composite surface; Described bottom composite surface is positioned at the bottom of described lens body, is connected with the described plane of incidence near the side of lens body central shaft; The described plane of incidence is positioned at the bottom centre of described lens body, caves in lens body top-direction; It is characterized in that:
Described bottom composite surface comprises at least two sub-composite surfaces, is connected between described sub-composite surface by non-working surface;
The sub-composite surface of described bottom composite surface and non-working surface form zigzag endless belt;
When described sub-composite surface is cut open along the central axis direction of scioptics body, on the hatching of sub-composite surface, the central shaft of the normal of any point in section and described lens body intersects at the below of lens body;
The hatching length of described sub-composite surface is greater than the hatching length of the non-working surface be adjacent.
2. direct-light type LED backlight illumination light-distribution lens as claimed in claim 1, it is characterized in that, the angle of described non-working surface and lens base is between 70 ° to 90 °.
3. direct-light type LED backlight illumination light-distribution lens as claimed in claim 1 or 2, it is characterized in that, the sawtooth root of the hatching of described bottom composite surface is positioned on the same line.
4. direct-light type LED backlight illumination light-distribution lens as claimed in claim 1 or 2, it is characterized in that, the hatching of described sub-composite surface is straight line or curve.
5. direct-light type LED backlight illumination light-distribution lens as claimed in claim 1 or 2, it is characterized in that, described sub-composite surface is identical with the angle of described lens body bottom surface, or increases gradually along the direction near lens centre axle.
6. direct-light type LED backlight illumination light-distribution lens as claimed in claim 1 or 2, it is characterized in that, the length of the hatching of described each sub-composite surface is equal, or increases successively along the direction to lens body central shaft.
7. the direct-light type LED backlight illumination light-distribution lens as described in one of claim 1 or 2, is characterized in that, described sub-composite surface is hair side.
8. direct-light type LED backlight illumination light-distribution lens as claimed in claim 1 or 2, is characterized in that, during described lens use, the exiting surface of LED flushes or higher than the bottom surface of the plane of incidence.
9. a direct-light type LED backlight illumination system, comprise the LED light source that is arranged on pcb board and be arranged on above LED light source to realize the lens of secondary light-distribution, it is characterized in that, described lens are the direct-light type LED backlight illumination light-distribution lens described in one of claim 1 to 8.
10. a TV, is characterized in that, comprises system as claimed in claim 9.
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| CN201520109152.5U CN204477931U (en) | 2015-02-14 | 2015-02-14 | A kind of direct-light type LED backlight illumination light-distribution lens, system and a kind of TV |
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| CN201520109152.5U CN204477931U (en) | 2015-02-14 | 2015-02-14 | A kind of direct-light type LED backlight illumination light-distribution lens, system and a kind of TV |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112198660A (en) * | 2020-10-29 | 2021-01-08 | 华中科技大学 | Forming method of light distribution lens and direct type LED backlight source device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112198660A (en) * | 2020-10-29 | 2021-01-08 | 华中科技大学 | Forming method of light distribution lens and direct type LED backlight source device |
| CN112198660B (en) * | 2020-10-29 | 2022-02-15 | 华中科技大学 | Forming method of light distribution lens and direct type LED backlight source device |
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