CN103672740A - Light guide plate and planar lighting device - Google Patents
Light guide plate and planar lighting device Download PDFInfo
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- CN103672740A CN103672740A CN201210337742.4A CN201210337742A CN103672740A CN 103672740 A CN103672740 A CN 103672740A CN 201210337742 A CN201210337742 A CN 201210337742A CN 103672740 A CN103672740 A CN 103672740A
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Abstract
The invention discloses a light guide plate and a planar lighting device. The planar lighting device comprises the light guide plate and at least one light-emitting source. The light guide plate comprises a light inlet face, a first face opposite to the light inlet face, a second face located between the light inlet face and the first face and a light outlet face opposite to the second face. The second face is covered with a diffusion reflecting layer, and the first face is gradually extended towards the light inlet face from the first side close to the second face to the second side close to the light outlet face. The light-emitting source is arranged corresponding to the light inlet face and provides light beams. According to the light guide plate and the planar lighting device, the light beams can be reflected by the first face to improve the light-outgoing efficiency of the light guide plate.
Description
Technical field
The present invention relates to LGP and there is the lighting device of LGP, espespecially a kind of for the LGP throwing light on and the planar lighting device with this LGP.
Background technology
The design of the flat lamp of known employing LGP arranges light emitting source in a side or the place, relative both sides of a LGP conventionally, described light emitting source provides light beam, after entering described LGP, can penetrate through the exiting surface of described LGP described LGP, can be used as the use of illumination.For increasing the positive tropism of light beam, described LGP arranges light guide structure in the offside of exiting surface conventionally, and site for example, with by beam direction exiting surface.In addition, for increasing luminous efficiency, described LGP is conventionally in the arranged outside reflector plate of the offside of described exiting surface, make the segment beam that the offside from described exiting surface spills to reenter LGP via described reflector plate reflection, and penetrate described LGP via described exiting surface, and then increase light extraction efficiency.In addition, in the design of some LGP, a side in described LGP relative luminous source is provided with catoptric arrangement, directly spills and light beam is led back to LGP, to increase light extraction efficiency in order to the light beam of avoiding being incident to herein.Yet, the incidence surface of this type of LGP to side conventionally perpendicular to the plane of optical axis, while causing the paraxial beam with higher light intensities to be incident to herein, be often reflected back toward light inlet face, and make the utilization rate of paraxial beam low, and cause flat lamp to there is obvious bright band near the region of the plane of incidence.Again, the light beam that penetrates described LGP via the aforementioned catoptric arrangement reflection that is arranged at incidence surface offside is confined to the fringe region of described exiting surface conventionally, described flat lamp is produced and have the field of illumination compared with bright limb.Moreover, for general user demand, conventionally wish that flat lamp provides uniform brightness, meanwhile, in response to environmental protection and the demand reducing costs, need a kind of LGP and planar lighting device thereof that improves light utilization efficiency, uniformity and simplify LGP processing procedure badly.
Summary of the invention
Technical problem to be solved by this invention is: in order to make up the deficiencies in the prior art, a kind of LGP is provided and there is the planar lighting device of described LGP, utilize and the reflecting surface folded light beam relative with incidence surface is set to promote the light extraction efficiency of described LGP and described planar lighting device, and can utilize multiple reflections to improve illumination profile, further, diffusive reflective layer is set in first surface, thereby improves the problem that in known technology, paraxial beam cannot be used effectively.
LGP of the present invention is by the following technical solutions:
LGP of the present invention, is applicable to a lighting device.Described lighting device comprises at least one light emitting source and described LGP, and described at least one light emitting source provides a light beam, and described LGP comprises an incidence surface, an exiting surface, a first surface and one second.Described first surface is relative with described incidence surface; Described exiting surface with described second relative.Described second between described incidence surface and described first surface, and be coated with one second diffusive reflective layer.Described first surface comprises one first side and one second side, the first side of described first surface is near described second, the second side of described first surface is near described exiting surface, and described first surface has the structure of extending towards described incidence surface gradually substantially to described the second side from described the first side.Wherein, the first of described light beam is via described second scattered reflection, then leaves described LGP through described exiting surface, by this, can increase light emission rate and the distributing uniformity of light beam.In addition, by first surface in the future the paraxial beam deviation of self-emitting light source towards the direction of exiting surface, and make segment beam through first surface total reflection and second of directive, then in second scattered reflection to exiting surface, to increase the illumination of lighting device.
Further, establishing W is the width on the perspective plane of first surface on second, and D is the projector distance of second side to the second of first surface; LGP more meets following condition: 0<W/D<0.6, and then mat is adjusted the efficiency that the face type of first surface passes from exiting surface to increase light beam.Further, the first surface of LGP is coated with one first diffusive reflective layer, and from described incidence surface, enter the second portion of light beam of described LGP via described first surface and the sequentially scattered reflection of described the second face, then leave described LGP through described exiting surface.By this, light beam (being paraxial beam) parallel with the optical axis direction of described light emitting source, that even have a low-angle angle with optical axis can sequentially reflect and penetrate described LGP via described first surface and described the second face, and the paraxial beam that makes to have higher light intensities can more efficiently be exported and then promote the light extraction efficiency of described LGP.In addition, because the segment beam via described first surface reflection is not directly through described exiting surface, but through described second reflection, then penetrate described LGP again, so the light beam of part more can not limit to the edge irradiating in field of illumination after penetrating described LGP.
Further, more can be via the optical surface shape of the described first surface of design, make the beam separation of described part reflex to the middle part of second, further to promote illumination uniformity or to avoid the middle part of lighting device to there is obvious bright band, and effectively improve LGP in known technology and make segment beam be gathered in the problem of edge and light usability deficiency.In some embodiment, first surface can be curved surface, comprise a plurality of continuous inclined-planes or an inclined-plane.Wherein, the angle of the direction of curved surface or the normal direction on a plurality of continuous inclined-planes and the optical axis of light emitting source is from the cumulative variation of the first side to the second side dullness of first surface.
Planar lighting device of the present invention is by the following technical solutions:
Planar lighting device of the present invention comprises a LGP and at least one light emitting source.Described LGP comprises an incidence surface, an exiting surface, a first surface and one second.Described first surface is relative with described incidence surface; Described exiting surface with described second relative.Described second between described incidence surface and described first surface, and be coated with one second diffusive reflective layer.Described first surface comprises one first side and one second side, the first side of described first surface is near described second, the second side of described first surface is near described exiting surface, and described first surface has the structure of extending towards described incidence surface gradually substantially to described the second side from described the first side.The corresponding described incidence surface setting of described at least one light emitting source also provides a light beam, and described light beam enters described LGP via described incidence surface, and described in each, at least one light emitting source has respectively an optical axis.Wherein, a first of described light beam is via described second scattered reflection, then leaves described LGP through described exiting surface.By this, can increase light emission rate and the illuminance uniformity of planar lighting device.
Further, each light emitting source in planar lighting device can have an optical mirror slip to distribute light beam, and the surrounding of light emitting source can be provided with a reflection subassembly, or the incidence surface of LGP can have at least one groove of shape of corresponding described optical mirror slip to be coated each light emitting source.
About the advantages and spirit of the present invention, can see through following detailed Description Of The Invention and appended accompanying drawing is further understood.
Accompanying drawing explanation
Fig. 1 is according to the exploded view of the planar lighting device of a preferred embodiment of the present invention;
Fig. 2 is that the planar lighting device of Fig. 1 is according to the profile of an embodiment;
Fig. 3 is that the planar lighting device of Fig. 1 is according to the profile of another embodiment;
Fig. 4 be in Fig. 1 LGP in the enlarged diagram at first surface place;
Fig. 5 is the local amplification profile according to the LGP of another embodiment;
Fig. 6 is the local amplification profile according to the LGP of another embodiment;
Fig. 7 is according to the profile of the planar lighting device of another embodiment;
Fig. 8 is according to the profile of the planar lighting device of another embodiment;
Fig. 9 is the configuration profile according to the LGP of another embodiment and light emitting source;
Figure 10 is the configuration profile according to the LGP of another embodiment and light emitting source.
Wherein, description of reference numerals is as follows:
1,4,5 planar lighting device 12 housings
14,24,34,44,54,64 LGPs
16,66 light emitting source 16a optical axises
16b optical axis direction 68 reflection subassemblies
122 light-emitting window 124 frame portion
142,642 incidence surface 144,244,344 first surfaces
2442a, 2442b, 2442c inclined-plane 144a, 244a the first side
144b, 244b the second side L12 ' are through the light beam of first surface total reflection
144c, 2442d, 2442e, 2442f, 3442 normal directions
146,446,546 exiting surface is 148,448,548 second
447 concave surface 547 convex surfaces
662 optical mirror slip 1,442 first diffusive reflective layer
1482 second diffusive reflective layer 6422 grooves
A2, A3, A4 angle D projector distance
W width L10 light beam
L12 second portion light beam L14 first light beam
The specific embodiment
Refer to Fig. 1, it is according to the exploded view of the planar lighting device 1 of a preferred embodiment of the present invention.Planar lighting device 1 comprises a housing 12, a LGP 14, a plurality of light emitting source 16 and other required electronic building brick (such as control module, transformer etc.), for simplifying drawing and explanation, aforementioned required electronic building brick does not all give being illustrated in figure and does not also separately specify below.In addition, in implementation, the physical dimension of housing 12 reality will coordinate actual product design and determine, and with the configuration shown in the present embodiment, not be limited.In the present embodiment, described a plurality of light emitting sources 16 are with a LED optical wand implementation, but the present invention is not as limit.The accommodating LGP 14 of housing 12, light emitting source 16 and other required electronic building brick.Housing 12 has a light-emitting window 122, to expose LGP 14.
Referring to Fig. 2, it is the profile of the planar lighting device 1 of the first embodiment, and its profile position can be with reference to figure 1 center line X-X, and wherein, for simplifying drawing, LGP 14 does not illustrate hatching, also same in follow-up drawing.LGP 14 comprises one first side 140, one second side 141, an incidence surface 142, a first surface 144, an exiting surface 146 and one second 148.First surface 144 is relative with incidence surface 142; Exiting surface 146 is 148 relative with second.In planar lighting device 1, exiting surface 146 can arrange over against light-emitting window 122; And the corresponding incidence surface 142 of light emitting source 16 arranges and provide light beam L10, light beam L10 enters LGP 14 via incidence surface 142, and each light emitting source 16 has an optical axis 16a.Second 148 between incidence surface 142 and first surface 144 and be coated with one second diffusive reflective layer 1482.The second diffusive reflective layer 1482 can be mixed with but be not limited to ink or the assembly of base material and light scattered reflection particle, forms, but be not limited to this mode and diffusive reflective layer can for example be printed or synchronize the mode of two-color injection with LGP.Base material is for example polymethyl methacrylate (Polymethylmethacrylate is called for short PMMA) or Merlon (Polycarbonate is called for short PC); Light scattered reflection particle is for example TiO2, SiO2 and mixing thereof.The second diffusive reflective layer 1482 will make the first part L14 of light beam L10, in interface, scattered reflection occur, to destroy total reflection phenomenon (Total Internal Reflection), assist LGP 14 guiding light beams to exiting surface 146 to penetrate, and then increase illumination and the uniformity of planar lighting device 1.Wherein, for ease of presenting, the thickness of the second diffusive reflective layer 1482 is that exaggeration is illustrated in Fig. 2.In addition, in some embodiment, the first side 140 and one second side 141 also can be coated with diffusive reflective layer.First surface 144 comprises one first side 144a and one second side 144b, the first side 144a of described first surface 144 is near second 148, the second side 144b of described first surface 144 is near exiting surface 146, and described first surface 144 has the structure of extending towards incidence surface 142 gradually substantially to its second side 144b from its first side 144a.By this, as shown in Figure 2, in the future the paraxial beam deviation of self-emitting light source 16 is towards the direction of exiting surface 146, and wherein segment beam L12 ' is through first surface 144 total reflections and second 148 of directive, again in second 148 scattered reflection to exiting surface 146, to increase the illumination of planar lighting device 1.
Referring to Fig. 3, is the profile of the planar lighting device 1 of the second embodiment, and its profile position can be with reference to figure 1 center line X-X.Compared to the first embodiment, the first surface 144 of the LGP 14 of the present embodiment is more coated with one first diffusive reflective layer 1442.The first diffusive reflective layer 1442 can be mixed with but be not limited to ink or the assembly of base material and light scattered reflection particle, the material that it can be identical or different with the second diffusive reflective layer 1482.By this, paraxial beam can be via first surface 144 and second 148 sequentially scattered reflection and is penetrated LGP 14, and the paraxial beam that makes to have higher light intensities can more efficiently be exported and then promote the light extraction efficiency of LGP 14.As shown in Figure 3, light beam L10 enters after LGP 14, and a L14 of first of light beam L10 is via second 148 scattered reflection, then leaves LGP 14 through exiting surface 146; A second portion L12 of light beam L10 is via first surface 144 and second 148 sequentially scattered reflection, then leaves LGP 14 through exiting surface 146.Light beam L10 penetrates after LGPs 14 from exiting surface 146, the use of usining as illumination through light-emitting window 122.The L14 of first of light beam L10 and second portion L12 represent that with band arrow fine line its travel path is in Fig. 2.
Furthermore, the second portion L12 of light beam L10 can have following characteristics: the tangent value of the angle of the direct of travel of the second portion L12 of light beam L10 and the direction of optical axis 16a is less than the projector distance D of the second side 144b to the second 148 of first surface 144 divided by half of the minimum range of 144 of incidence surface 142 and first surfaces.That is the second portion L12 of light beam L10 has larger luminous intensity, and this segment beam will be via sequentially reflection of first surface 144 and second 148, then leaves LGP 14 through exiting surface 146.Thus, overcome the problem that in known technology, paraxial beam cannot be used effectively.In the present embodiment, this minimum range is the distance of the second side 144b along exiting surface 146 to incidence surface 142 of first surface 144.In some application, when this minimum range is during much larger than projector distance D, first surface 144 is all little to the distance difference of incidence surface 142 everywhere, now, in aforementioned to the restriction relation of described tangent value in, minimum range can be directly with first surface 144 to the nominal of incidence surface 142 apart from substitution, product specification size for example.
Referring to Fig. 4, Fig. 4 is that in Fig. 1, LGP 14 is in the enlarged diagram at first surface 144 places, and wherein, for simplifying drawing, the first diffusive reflective layer 1442 and the second diffusive reflective layer 1482 are not illustrated in Fig. 4.Due to the geometric profile (being optical surface shape) of first surface 144 by the second portion L12 that determines light beam L10 in the angle of reflection (when first surface 144 is coated with the first diffusive reflective layer 1442) of first surface 144; Or, the geometric profile of first surface 144 by deciding section light beam L10 in the angle of total reflection or refraction angle (when first surface 144 is not coated with the first diffusive reflective layer 1442) of first surface 144.That is the geometric profile of first surface 144 determines the direct of travel that light beam L10 leaves from first surface 144.In the present embodiment, first surface 144 is curved surfaces, the included angle A 2 of the direction 16b of its normal direction 144c and optical axis 16a is from the cumulative variation of the first side 144a to the second side 144b dullness of first surface 144, make second portion L12 unlikely concentrating after first surface 144 reflections of light beam L10 be incident upon second 148, to avoid light beam excessively to assemble, produce bright band.Or when first surface 144 is not coated with the first diffusive reflective layer 1442, the curved surface of first surface 144 can make the light beam leaving from first surface 144 by suitable distribution, to avoid light beam excessively to assemble, produce bright band.In other embodiment, first surface 144 can be that radius of curvature is the sphere of 40.89mm, but can also be radius of curvature between sphere or the aspheric surface of 1 ~ 1000mm, and included angle A 2 is from the cumulative variation of the first side 144a to the second side 144b dullness of first surface 144.Further, via suitable curved design, can reflex to the position distribution of second 148 in the to a certain degree lower second portion L12 that controls light beam L10, that is Indirect method planar lighting device 1 integral illumination distributes.For example, the second portion L12 of light beam L10 separation after first surface 144 scattered reflections is advanced towards second 148 middle part.Owing to distributing the illumination in photometry source often to there is obviously lower shortcoming of illumination in centre via known LGP, can make by this illumination of middle part of the field of illumination of planar lighting device 1 be compensated, to promote illumination efficiency and the light uniformity, and can meet general user demand.
In some embodiment, for further increasing the efficiency that light beam L10 passes from exiting surface 146, LGP 14 can more meet with following formula (1): 0<W/D<0.6.Wherein, W is the width on the perspective plane of first surface 144 on second 148, and D is the projector distance of the second side 144b to the second 148 of first surface 144.In addition, aforementioned relational expression also contributes to the second end 144b that limits first surface 144 excessively towards incidence surface 142 directions, to extend, to avoid the too small light extraction efficiency with optimizing planar lighting device 1 of exiting surface 146 bores.For example, in an embodiment wherein, first surface 144 can be that radius of curvature is the sphere of 36.34mm, and W/D=0.48, but the present invention is not all as limit.In addition, when the first surface 144 of LGP 14 is coated with the first diffusive reflective layer 1442 and meets formula (1), more can further avoid light beam L10 to be reflexed to second 148 by first surface 144, be reflected back first surface 144 through second 148 again, make light beam L10 be difficult to penetrate the situation of LGP 14.
Supplementary notes, tangent value and the W/D value of the aforementioned angle about the direct of travel of the second portion L12 with numerical relation confine optical beam L10 and the direction of optical axis 16a are only examples, be convenient to illustrate effect of the present invention, but the present invention are not as limit.In addition, in the present embodiment, housing 12 comprises a frame portion 124, around forming light window 122 and can covering light emitting source 16 and first surface 144, makes planar lighting device 1 outward appearance succinct.
In previous embodiment, first surface 144 is with normal direction continually varying curved surface implementation, but the present invention is not as limit.Refer to Fig. 5, it is according to the local amplification profile of the LGP 24 of another embodiment.In the present embodiment, LGP 24 is roughly the same with LGP 14 structures, therefore LGP 24 is still continued to use the element numbers of LGP 14, the related description of aforementioned LGP 14 is in this applicable person, also has applicablely, does not separately repeat.The place of LGP 24 and LGP 14 main differences is that the first surface 244 of LGP 24 comprises three continuous inclined-plane 2442a, 2442b and 2442c, and the included angle A 3 of the direction 16b of the normal direction 2442d of inclined-plane 2442a, 2442b and 2442c, 2442e and 2442f and optical axis 16a is from the cumulative variation of the first side 244a to the second side 244b dullness of first surface 244.In the present embodiment, though the normal direction 2442d of first surface 244,2442e and 2442f are Discrete Change, can reach equally the effect that the whole light extraction efficiency of light beam L10 utilization rate and LGP 24 promotes.What remark additionally is, in the present embodiment, the included angle A 3 of the direction 16b of normal direction 2442d and optical axis 16a can be limited between 1 to 4 degree, the included angle A 3 of the direction 16b of normal direction 2442e and optical axis 16a can be limited between 3 to 6 degree, the included angle A 3 of the direction 16b of normal direction 2442f and optical axis 16a can be limited between 5 to 8 degree, but included angle A 3 is still dull cumulative variation from the first side 144a to the second side 144b of first surface 144.For example, from the included angle A 3 of the first side 144a to the second side 144b of first surface 144, changing is 2 °-4 °-6 °.Under this structural condition, collocation first surface 144 is coated with the first diffusive reflective layer 1442, and the light extraction efficiency of the LGP 24 of the present embodiment can be promoted to 75%, relative, and the light extraction efficiency of known LGP only reaches 59.6%.
Refer to Fig. 6, it is according to the local amplification profile of the LGP 34 of another embodiment.In the present embodiment, LGP 34 is roughly the same with LGP 14 structures, therefore LGP 34 is still continued to use the element numbers of LGP 14, the related description of aforementioned LGP 14 is in this applicable person, also has applicablely, does not separately repeat.LGP 34 is that with the place of LGP 14 main differences the first surface 344 of LGP 34 is inclined-planes.In the present embodiment, first surface 344 is the single normal direction 3442 of tool only, and the included angle A 4 of the direction 16b of itself and optical axis 16a is only also single, for example, be 4 °, but can reach equally the effect that light beam L10 utilization rate and the whole light extraction efficiency of LGP 34 promote.Supplementary notes, for ease of explanation, the profile of aforementioned first surface 144,244,344 and included angle A 2, A3, A4 are all that exaggeration is illustrated in Fig. 4 to Fig. 6, the profile of non-finger actual product and dimension scale.
Previous embodiment all be take and parallelly with exiting surface 146 is example explanation for second 148, but the present invention is not as limit.Refer to Fig. 7, it is according to the profile of the planar lighting device 4 of another embodiment.Planar lighting device 4 is roughly the same with planar lighting device 1 structure, therefore planar lighting device 4 is still continued to use the element numbers of planar lighting device 1, the related description of aforementioned planar lighting device 1 is in this applicable person, also has applicablely, does not separately repeat.The place of planar lighting device 4 and planar lighting device 1 main difference is that second 448 of LGP 44 of planar lighting device 4 is concave surfaces, can make light beam L10 produce and disperse effect in LGP 44, contributes to increase the light extraction efficiency of light conductor 14.In addition, in the present embodiment, also exiting surface 446 can be changed into a concave surface 447, as shown in phantom in Figure 7, beam divergence can be distributed by this, to promote field of illumination area.In implementation, but also both have concurrently LGP.
Refer to Fig. 8, it is according to the profile of the planar lighting device 5 of another embodiment.Planar lighting device 5 is roughly the same with planar lighting device 1 structure, therefore planar lighting device 5 is still continued to use the element numbers of planar lighting device 1, the related description of aforementioned planar lighting device 1 is in this applicable person, also has applicablely, does not separately repeat.The place of planar lighting device 5 and planar lighting device 1 main difference is that second 548 of LGP 54 of planar lighting device 5 is convex surfaces, can make light beam L10 in LGP 54, produce convergent effect, contribute to increase the illumination of the middle part of field of illumination.In addition, in the present embodiment, also exiting surface 546 can be changed into a convex surface 547, as shown in phantom in Figure 8, light beam can be assembled slightly by this, also contribute to increase the illumination of the middle part of field of illumination.In implementation, but also both have concurrently LGP.
Take Fig. 2 as example, for the light beam L10 that makes the light beam L10 of light emitting source 16 transmittings can effectively enter LGP 14 and to enter in LGP 14 can be uniformly in the interior transmission of LGP 14, and then making light beam L10 from exiting surface 146, penetrate LGP 14 uniformly substantially, this contributes to field of illumination intraoral illumination uniformity.In implementation, can design the structure of light emitting source 16 and incidence surface 142, to realize aforementioned object.Refer to Fig. 9, it is the configuration profile with light emitting source 66 according to the LGP 64 of another embodiment.LGP 64 is roughly the same with LGP 14 structures, therefore LGP 64 is still continued to use the element numbers of LGP 14, the related description of aforementioned LGP 14 is in this applicable person, also has applicablely, does not separately repeat.In the present embodiment, light emitting source 66 has an optical mirror slip 662 to distribute light beam L10, the incidence surface 642 of LGP 64 has the groove 6422 of shape of corresponding optical mirror slip 662 to be coated light emitting source 66, if for example optical mirror slip 662 is a hemisphere, 6422 of grooves are a hemisphere hole, but the present invention is not as limit.By this, light beam L10 can be surrounded and can major part enter in LGP 64 by groove 6422 after optical mirror slip 662 penetrates, and to promote the utilization ratio of light beam L10, also can promote the whole light extraction efficiency of planar lighting device.Supplementary notes, are used in reality, use a plurality of light emitting sources 66 more, thus LGP 64 also respectively corresponding light emitting source 66 a plurality of grooves 6422 are set.
What remark additionally is, in the present embodiment, to there is refraction effect in incidence surface 642 in the LGP 64 that light beam L10 enters different medium from air, therefore LGP 64 parts (with empty wire frame) at incidence surface 642 places can be considered as to a refraction part in logic, in implementation, can for example, in this surface upper (groove 6422 surfaces), form refraction interface profile, make can advance towards required direction after light beam L10 refraction, for example make second 148 of the even directive of light beam L10 energy, scattered reflection effect through the second diffusive reflective layer 1482, light beam L10 can leave LGP 64 through exiting surface 146 uniformly after second 148 reflection, and then irradiate in field of illumination uniformly.Same, also can make the middle part of second 148 of light beam L10 deflection directive, make light beam L10 leave the middle part that LGP 64 can major part concentrates on field of illumination, meet the custom that general illumination is used.In addition, in implementation, if LGP does not have groove 6422 as the aforementioned, for example LGP 14, also a reflection subassembly 68 can be set in the surrounding of light emitting source 66, and for example reflecting element cylindraceous, is placed on light emitting source 66, for the light beam L10 of reflecting part.The opening contact of reflection subassembly 68 is the incidence surface 142 of plane, makes the light beam L10 overwhelming majority of light emitting source 66 transmittings to enter LGP 14 via incidence surface 142, as shown in figure 10.This structure configuration also can be brought into play the effect of aforementioned grooves 6422, that is promotes utilization ratio and the whole light extraction efficiency of planar lighting device of light beam L10.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (22)
1. a LGP, is applicable to a lighting device, and described lighting device comprises at least one light emitting source and described LGP, and described at least one light emitting source provides a light beam, it is characterized in that, described LGP comprises:
One incidence surface;
One first surface is relative with described incidence surface;
One second, between described incidence surface and described first surface, and be coated with one second diffusive reflective layer; And
One exiting surface, with described second relative;
Wherein, described first surface comprises one first side and one second side; the first side of described first surface is near described second, and the second side of described first surface is near described exiting surface, and described first surface has the structure of extending towards described incidence surface gradually to described the second side from described the first side;
Wherein, a first of described light beam is via described second scattered reflection, then leaves described LGP through described exiting surface.
2. LGP as claimed in claim 1, is characterized in that, further meets following condition:
0<W/D<0.6;
Wherein, W is the width on the perspective plane of described first surface on described second, and D is that described second side of described first surface is to the projector distance of described second.
3. LGP as claimed in claim 2, it is characterized in that, described first surface is coated with one first diffusive reflective layer, and from described incidence surface, enter the second portion of light beam of described LGP via described first surface and the sequentially scattered reflection of described the second face, then leave described LGP through described exiting surface.
4. LGP as claimed in claim 3, it is characterized in that, described light emitting source has an optical axis, and described the second side that the tangent value of the angle of the direct of travel of the described second portion of described light beam and the direction of described optical axis is less than described first surface is to half divided by the minimum range between described incidence surface and described first surface of the projector distance of described second.
5. LGP as claimed in claim 1, is characterized in that, described first surface is a curved surface.
6. LGP as claimed in claim 5, is characterized in that, described light emitting source has an optical axis, and the angle of the direction of wherein said normal to a surface direction and described optical axis is from the extremely cumulative variation of described the second side dullness of described the first side of described first surface.
7. LGP as claimed in claim 1, is characterized in that, described first surface comprises a plurality of continuous inclined-planes.
8. LGP as claimed in claim 7, it is characterized in that, described light emitting source has an optical axis, and the angle of the normal direction on wherein said a plurality of inclined-planes and the direction of described optical axis is from the extremely cumulative variation of described the second side dullness of described the first side of described first surface.
9. LGP as claimed in claim 1, is characterized in that, described first surface is an inclined-plane.
10. LGP as claimed in claim 1, is characterized in that, described the second face is a concave surface or a convex surface.
11. LGPs as claimed in claim 1, is characterized in that, described exiting surface is a convex surface or a concave surface.
12. LGPs as claimed in claim 1, is characterized in that, described incidence surface has at least one refraction part.
13. 1 kinds of planar lighting devices, is characterized in that, comprise:
One LGP, comprises:
One incidence surface;
One first surface is relative with described incidence surface;
One second, between described incidence surface and described first surface, and be coated with one second diffusive reflective layer; And
One exiting surface, with described second relative;
Wherein, described first surface comprises one first side and one second side; the first side of described first surface is near described second, and the second side of described first surface is near described exiting surface, and described first surface has the structure of extending towards described incidence surface gradually to described the second side from described the first side; And
At least one light emitting source, corresponding described incidence surface setting also provides a light beam, and described light beam enters described LGP via described incidence surface, and described in each, at least one light emitting source has respectively an optical axis;
Wherein, a first of described light beam is via described second scattered reflection, then leaves described LGP through described exiting surface.
14. planar lighting devices as claimed in claim 13, is characterized in that, further comprise a housing, accommodating described LGP and described at least one light emitting source, and wherein said housing has a light-emitting window, and described exiting surface is over against described light-emitting window setting.
15. planar lighting devices as claimed in claim 13, is characterized in that, further meet following condition:
0<W/D<0.6;
Wherein, W is the width on the perspective plane of described first surface on described second, and D is that described second side of described first surface is to the projector distance of described second.
16. planar lighting devices as claimed in claim 15, it is characterized in that, the described first surface of described LGP is coated with one first diffusive reflective layer, and from described incidence surface, enter the second portion of light beam of described LGP via described first surface and the sequentially scattered reflection of described the second face, then leave described LGP through described exiting surface.
17. planar lighting devices as claimed in claim 16, it is characterized in that, described light emitting source has an optical axis, and described the second side that the tangent value of the angle of the direct of travel of the described second portion of described light beam and the direction of described optical axis is less than described first surface is to half divided by the minimum range between described incidence surface and described first surface of the projector distance of described second.
18. planar lighting devices as claimed in claim 13, is characterized in that, described first surface is a curved surface, and the angle of the direction of described normal to a surface direction and described optical axis is from the extremely cumulative variation of described the second side dullness of described the first side of described first surface.
19. planar lighting devices as claimed in claim 13, it is characterized in that, described first surface comprises a plurality of continuous inclined-planes, and the angle of the normal direction on described a plurality of inclined-planes and the direction of described optical axis is from the extremely cumulative variation of described the second side dullness of described the first side of described first surface.
20. planar lighting devices as claimed in claim 13, is characterized in that, described in each, at least one light emitting source has an optical mirror slip to distribute described light beam, and the surrounding of described light emitting source is provided with a reflecting element.
21. planar lighting devices as claimed in claim 13, it is characterized in that, described in each, at least one light emitting source has an optical mirror slip to distribute described light beam, and at least one groove of shape that the described incidence surface of described LGP has corresponding described optical mirror slip is to be coated described at least one light emitting source.
22. planar lighting devices as claimed in claim 13, it is characterized in that, described in each, at least one light emitting source has an optical mirror slip to distribute described light beam, and the described incidence surface of described LGP has at least one refraction part that corresponding described at least one light emitting source arranges.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210337742.4A CN103672740A (en) | 2012-09-12 | 2012-09-12 | Light guide plate and planar lighting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210337742.4A CN103672740A (en) | 2012-09-12 | 2012-09-12 | Light guide plate and planar lighting device |
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| CN103672740A true CN103672740A (en) | 2014-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210337742.4A Pending CN103672740A (en) | 2012-09-12 | 2012-09-12 | Light guide plate and planar lighting device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113189826A (en) * | 2019-01-09 | 2021-07-30 | 深圳市光鉴科技有限公司 | Structured light projector and 3D camera |
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Application publication date: 20140326 |