CN101749612A - Backlight module - Google Patents
Backlight module Download PDFInfo
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- CN101749612A CN101749612A CN201010300101A CN201010300101A CN101749612A CN 101749612 A CN101749612 A CN 101749612A CN 201010300101 A CN201010300101 A CN 201010300101A CN 201010300101 A CN201010300101 A CN 201010300101A CN 101749612 A CN101749612 A CN 101749612A
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- light
- emitting diode
- lgp
- incidence surface
- lens
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Abstract
The invention provides a backlight module which comprises a light guide plate and a light emitting diode, the light guide plate comprises a light incident surface, a light emergent surface and a bottom surface, the light incident surface is adjacent to the light-emitting diode so as to converge and lead light emitted by the light-emitting diode into the light guide plate, the light incident surface comprises a plurality of lens structures, each lens corresponds to one light-emitting diode, the light-emitting chip of the light-emitting diode is arranged on an optical shaft of the lens structure corresponding to the light-emitting diode, and the bottom surface comprises a plurality of reflecting structures used for reflecting light lead in by the light incident surface to the light emergent surface. The backlight module of the invention has high collimation property of emergent light and high light utilization ratio.
Description
Technical field
The present invention relates to a kind of module backlight, relate in particular to a kind of emergent light collimation height, module backlight that light utilization efficiency is high.
Background technology
Module backlight is widely used in numerous photovoltaic, has certain collimation requirement usually for the light from module outgoing backlight.
See also Fig. 1, a kind of prior art module 1 backlight comprises a LGP 10, a prismatic lens 12 and a diffusion sheet 14.Described LGP 10 comprises an incidence surface 100, an exiting surface 102 and a bottom surface 104.Described incidence surface 100 is a wherein side of described LGP 10, and light is injected described LGP 10 by described incidence surface 100.Described exiting surface 102 is the end face of described LGP 10, and light penetrates described LGP 10 by described exiting surface 102.Described bottom surface 104 is oppositely arranged with described exiting surface 102, and it comprises a plurality of catoptric arrangements 128.Described prismatic lens 12 comprises the end face 124 of the relative described prism facets 122 with of a prism facets 122.The end face 124 of described diffusion sheet 14 adjacent described prismatic lenses 12 is provided with.
Light enters described LGP 10 from described incidence surface 100, part light directly penetrates from described exiting surface 102, part light penetrates from described bottom surface 104, and most of light can be inner through the reflection of one or many and finally from the described LGP 10 of described exiting surface 102 ejaculations at LGP 10.In above-mentioned reflection process, the angle of divergence of light does not change, promptly, be reflected and approaching when described exiting surface 102 penetrates the angle of divergence of light of described LGP 10 and incident LGP 10, and described emergent light is not the normal direction outgoing from described exiting surface 102, but with 102 one-tenth less angle outgoing of described exiting surface.The light that penetrates from the exiting surface 102 of described LGP 10 enters described prismatic lens 12 by described prism facets 122, its major part is changed into normal direction outgoing along described end face 124 by a plurality of prism structures 126 on the described prism facets 122 with its direction, and propagates to described diffusion sheet 14 directions.
Though described module backlight 1 can provide a kind of collimated light, the angle of divergence of the collimated light that is provided is excessive and be difficult to effectively reduce.When the size of described catoptric arrangement 128 is big, the angle of divergence of the light that is reflected is bigger, therefore for the angle of divergence that reduces emergent light, the collimation that improves emergent light, described catoptric arrangement 128 need be made comparatively accurately, increase the difficulty and the cost of manufacture craft.
Industry has also proposed another kind of module backlight, it mainly utilizes the exiting surface at LGP that black and white slit and post lens are set, make the focal plane of post lens be positioned at black and white slit place, and the focus of post lens is overlapping with white slit center, has realized the height of emergent light is collimated by this design.But this kind design is because the existence of black and white slit, and the width of white slit is much smaller than black slit, cause light to penetrate from LGP after, a large amount of light is deceived slits and is blocked absorption, makes that a large amount of light is lost.On the other hand,, must increase the width of white slit, but this can cause the increase of the collimated light angle of divergence again if improve the utilization rate of light, and to the raising effect of the utilization rate of light and not obvious.
Summary of the invention
There is the problem that the emergent light collimation is low, light utilization efficiency is low at prior art module backlight, is necessary to provide a kind of emergent light collimation height, module backlight that light utilization efficiency is high.
A kind of module backlight, comprise LGP and light emitting diode, described LGP comprises incidence surface, exiting surface and bottom surface, the adjacent described light emitting diode of described incidence surface imports in the described LGP so that the light that described light emitting diode was sent is assembled, described incidence surface comprises a plurality of lens arrangements, the corresponding light emitting diode of each lens, the luminescence chip of described light emitting diode is arranged on the optical axis of the described lens arrangement corresponding with it, and described bottom surface comprises a plurality of catoptric arrangements that are used for the light that incidence surface imports is reflexed to exiting surface.
Described lens arrangement is post lens arrangement or globe lens structure.
Described catoptric arrangement can be the V-type groove, and the bearing of trend of groove is parallel to described incidence surface.
Described catoptric arrangement can be deep-slotted chip breaker, and the bearing of trend of groove is parallel to described incidence surface.
Described catoptric arrangement is discontinuous distribution, and its arranging density is along with the increase of the distance of itself and described incidence surface and increase.
Compared to prior art, module backlight of the present invention has improved the collimation of its emergent light with comparatively simple structure, and the brightness of emergent light simultaneously also is improved, even can realize the collimation in the Different Plane and the different requirements of the angle of divergence.
Description of drawings
Fig. 1 is the side structure schematic diagram of a kind of module backlight of prior art.
Fig. 2 is the perspective view of the present invention's module first embodiment backlight.
Fig. 3 is the schematic top plan view of module backlight shown in Figure 2.
Fig. 4 is the side structure schematic diagram of module backlight shown in Figure 2.
Fig. 5 is the propagation of the light of module backlight shown in Figure 2 in LGP is changed into the Z direction by directions X a light path schematic diagram.
Fig. 6 is that the light of module backlight shown in Figure 2 is at the light path schematic diagram in the YOZ plane behind the outgoing LGP.
Fig. 7 is that the light of module backlight shown in Figure 2 is at the light path schematic diagram in the XOZ plane behind the outgoing LGP.
Fig. 8 is the perspective view of the present invention's module second embodiment backlight.
Fig. 9 is that module backlight shown in Figure 8 is in the XOZ plane and the light path schematic diagram of emergent light in the YOZ plane.
Figure 10 is the side structure schematic diagram and the part light path schematic diagram of the LGP of the present invention's module the 3rd embodiment backlight.
Figure 11 is that module backlight shown in Figure 10 is in the XOZ plane and the light path schematic diagram of emergent light in the YOZ plane.
The specific embodiment
Describe below in conjunction with the structure of accompanying drawing grating alignment system of the present invention.
See also Fig. 2 and Fig. 3, wherein Fig. 2 is the perspective view of the present invention's module first embodiment backlight, and Fig. 3 is the schematic top plan view of module backlight shown in Figure 2.Described module backlight 2 comprises LGP 20, a plurality of light emitting diode (LightEmitting Diode, LED) 22 and black and white adhesive plaster 24.
Described LGP 20 whole rectangular structures, it comprises an incidence surface 200, an exiting surface 202 and a bottom surface 204.Described LGP 20 can by polymethyl methacrylate (PolymethylMethacrylate, PMMA) or Merlon (Polycarbonate PC) waits material to make by technologies such as ejection formations.
Described incidence surface 200 is a wherein side of described LGP 20, and exterior light can enter described LGP 20 by described incidence surface 200.Described incidence surface 200 comprises a plurality of lens arrangements 206, and described lens arrangement 206 is to arrange from the post lens arrangement that described incidence surface 200 outwards protrudes to form.According to optical principle, the post lens can play converging action to light along optical axis direction, promptly reduce the angle of divergence of light beam.
Described exiting surface 202 adjacent described incidence surfaces 200, the light of propagating in described LGP 20 can penetrate described LGP 20 by described exiting surface 202, in the present embodiment, described exiting surface 202 and described 200 vertical connections of incidence surface.
Described bottom surface 204 is the surface of a described relatively exiting surface 202, and in abutting connection with described incidence surface 200, described bottom surface 204 can change the direction of propagation that is mapped to its surperficial light simultaneously for it.Described LGP 20 all is the transparent material that forms described LGP 20 between described exiting surface 202 and described bottom surface 204.Described bottom surface 204 comprises a plurality of catoptric arrangements 208, and described catoptric arrangement 208 is a V-type groove structure, and each V-type groove structure is extended setting along being parallel to the incidence surface direction.
Described catoptric arrangement 208 is discontinuous distribution, separated by a distance between the per two adjacent V-type groove structures, and its distribution density increases with the increase of the distance of described V-type groove structure and described incidence surface 200, be that described catoptric arrangement 208 is being punished the lax relatively of cloth near described incidence surface 200, and punish the intensive relatively of cloth away from described incidence surface 200.This kind arrangement design of described catoptric arrangement 208, can improve the outgoing light homogeneity of described module backlight 2, such as, the light intensity of the incident light at close incidence surface 200 places is bigger, the distribution density of corresponding catoptric arrangement 208 is lax relatively, can allow more light continue to propagate forward; And away from the light intensity of the incident light at incidence surface 200 places a little less than, the distribution density of corresponding catoptric arrangement 208 is intensive relatively, can more light be reflected.Further, the surface of described catoptric arrangement 208 is a reflective surface will, as coating or be printed with the reflectance coating of high reflectance or be coated with the reflectance coating of high reflectance.In the present embodiment, the height of described catoptric arrangement 208 and width are all identical, and it also can change its height and width design according to actual needs.
In further improvement design, reflector plate (figure does not show) can also be set below described bottom surface 204, with will be from the described LGP 20 of the light reflected back that release described bottom surface 204, the optical quality of light leakage phenomena, the described module 2 backlight of improvement can be prevented on the one hand, the light utilization efficiency of described module backlight 2 can also be increased on the other hand.
The described incidence surface 200 of described light emitting diode 22 adjacent described LGPs 20 is provided with.Described light emitting diode 22 comprises luminescence chip, and the light emission direction of described luminescence chip is towards described incidence surface 200.In the present embodiment, each luminescence chip is corresponding with a lens arrangement 206, and each luminescence chip is positioned on the optical axis of corresponding described lens arrangement 206, that is to say that the optical axis center of described light emitting diode 22 and described the lens arrangement 206 wherein optical axis of post lens are consistent.The light major part that described luminescence chip sends enters corresponding lens arrangement 206, through the converging action of lens arrangement 206, forms collimated ray and enters described LGP 20; Fraction enters adjacent lenses structure 206 or more remote lens arrangement 206, and the refraction of process lens arrangement 206 enters described LGP 20, propagates into black and white glue 24 what is more.This fraction light is compared with this major part light, and its influence can be ignored.
Described black and white glue 24 is a kind of cloth insertion sheets that are used to encapsulate module 2 backlight, and it comprises a white positive (not indicating) and a black reverse side (not indicating).Wherein said white front has the light reflectivity more than 85%, and described black reverse side has the absorptivity more than 90%.In the present embodiment, the black reverse side of black and white glue 24 so that the light of absorption from leaking out between described light emitting diode 22 and the described LGP 20 is avoided the edge light leakage phenomena, guarantees the optical quality of described module backlight 2 towards described light emitting diode 22.In Fig. 2 and Fig. 3, represent described incidence surface 200 and described lens arrangement 206 for clear, the upper part of described black and white glue 24 between described light emitting diode 22 and LGP 20 do not draw.
In the present embodiment, described light emitting diode 22 and described LGP 20 are arranged in the chase of described module backlight 2, by fixing described light emitting diode 22 of described chase and described LGP 20.
The light communication process of present embodiment module 2 backlight is summarized as follows: with three-dimensional coordinate shown in Figure 2 is benchmark, defines a plane X OZ, and it is perpendicular to described incidence surface 200, also perpendicular to described exiting surface 202; Define another plane YOZ, it is parallel to described incidence surface 200, and perpendicular to described exiting surface 202.Light sends from described light emitting diode 22, and arrives the described lens arrangement 206 of described incidence surface 200.Described lens arrangement 206 makes incident assemble from the angle of divergence of the light beam of described light emitting diode 22, and imports in the described LGP 20.Concretely, the light that sends from described light emitting diode 22, most of light is propagated towards directions X, another part light is propagated towards the Y direction, the light of propagating towards directions X can continue to advance along the directions X propagation, and towards the light of Y direction, can be because the reason that the angle of divergence is assembled by described lens arrangement 206, and to directions X deflection.Be imported into the light in the described LGP 20, part directly penetrates described LGP 20 from described exiting surface 202, another part penetrates described LGP 20 from described bottom surface 204, and most of light can be inner through the reflection of one or many and finally from described exiting surface 202 ejaculations at LGP 20.In described reflection process, when light arrived described bottom surface 204, its part light was reflected by the catoptric arrangement 208 of described bottom surface 204.Because the V-type groove structure of described catoptric arrangement 208, the light that is mapped to described catoptric arrangement 208 from described incidence surface 200 directions can be reflected, its direction of propagation can be changed towards described exiting surface 202 directions, and promptly light can be propagated to change into to the Z direction and propagate by directions X, as shown in Figure 5.And the light of propagating to the Y direction, most of can the reflection by the side between described exiting surface 202 and described bottom surface 204 (indicating) institute, and mainly finally from the described LGP 20 of described exiting surface 202 ejaculations.If it is suitable that the inclination angle of the described relatively exiting surface 202 of the reflecting surface of described catoptric arrangement 208 (indicate) is selected, the light that major part is mapped to described catoptric arrangement 208 can be guided the normal direction towards described exiting surface 202.So module 2 backlight can be implemented in the emergent light height collimation in the YOZ plane, as shown in Figure 6; And in the XOZ plane, emergent light is the bigger collimated light of the angle of divergence, as shown in Figure 7.So, promptly can improve the collimation of the light of described module backlight 2, also improve the light utilization efficiency of described module backlight with simple structure.And, since from the light of described light emitting diode 22 when the described LGP 20 of incident, promptly assembled, make the brightness of the light that penetrates from described exiting surface 202 also be improved.
Further, further improve the collimation of the light that penetrates from described exiting surface 202 if desired, can realize with distance and the corresponding radius that changes described lens arrangement 206 between the described lens arrangement 206 by adjusting described light emitting diode 22.
Seeing also Fig. 8, is the perspective view of the present invention's module second embodiment backlight.The module backlight 3 of present embodiment and the module backlight 2 of first embodiment are roughly the same, and its main distinction is: the incidence surface 300 of LGP 30 comprises a plurality of lens arrangements 306, and described lens arrangement 306 is the globe lens structure.In the present embodiment, the described post lens arrangement 206 at incidence surface 200 places described in the module backlight 2 of first embodiment is changed to globe lens structure 306, can in a plurality of planes, in the XOZ plane and YOZ plane, assemble light from light emitting diode 32.Module backlight 2 with respect to first embodiment, the collimation and the brightness of the light that the module backlight 3 of present embodiment penetrates except the exiting surface 302 that can improve in the YOZ plane from LGP 300, the collimation and the brightness that can also be further in the XOZ plane, improve the light that the exiting surface 302 from LGP 30 penetrates, as shown in Figure 9.
Seeing also Figure 10, is the planar structure schematic diagram of the present invention's module the 3rd embodiment backlight.The module backlight 4 of present embodiment and the module backlight 2 of first embodiment are roughly the same, and its main distinction is: the catoptric arrangement 408 of the bottom surface 404 of LGP 40 is the deep-slotted chip breaker structure.In the present embodiment, is the deep-slotted chip breaker structure with the described catoptric arrangement 208 at 204 places, bottom surface described in the module backlight 2 of first embodiment by V-type groove structure modify, its cross section semicircular in shape shape, after so design can make light by described catoptric arrangement 408 reflections, in the light of XOZ plane outgoing, has the higher angle of divergence, improve the visual angle of described module backlight 4, but do not influence the height collimation of the light of outgoing in the YOZ plane, as shown in figure 11.
Only be preferred case study on implementation of the present invention below, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. module backlight, it comprises LGP and light emitting diode, described LGP comprises incidence surface, exiting surface and bottom surface, the adjacent described light emitting diode of described incidence surface imports in the described LGP so that the light that described light emitting diode was sent is assembled, it is characterized in that: described incidence surface comprises a plurality of lens arrangements, the corresponding light emitting diode of each lens, the luminescence chip of described light emitting diode is arranged on the optical axis of the described lens arrangement corresponding with it, and described bottom surface comprises a plurality of catoptric arrangements that are used for the light that incidence surface imports is reflexed to exiting surface.
2. module backlight according to claim 1 is characterized in that: described lens arrangement is post lens arrangement or globe lens structure.
3. module backlight according to claim 1 is characterized in that: described catoptric arrangement is the V-type groove, and the bearing of trend of groove is parallel to described incidence surface.
4. module backlight according to claim 1 is characterized in that: described catoptric arrangement is a deep-slotted chip breaker, and the bearing of trend of groove is parallel to described incidence surface.
5. module backlight according to claim 1 is characterized in that: described catoptric arrangement is discontinuous distribution, and its arranging density is along with the increase of the distance of itself and described incidence surface and increase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010300101A CN101749612A (en) | 2010-01-07 | 2010-01-07 | Backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010300101A CN101749612A (en) | 2010-01-07 | 2010-01-07 | Backlight module |
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| Publication Number | Publication Date |
|---|---|
| CN101749612A true CN101749612A (en) | 2010-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010300101A Pending CN101749612A (en) | 2010-01-07 | 2010-01-07 | Backlight module |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185065A (en) * | 2011-04-12 | 2011-09-14 | 武汉迪源光电科技有限公司 | Light-emitting diode with grating structure |
| CN102889522A (en) * | 2012-09-25 | 2013-01-23 | 上海江燕电梯配件研究所 | Backlight component for liquid crystals |
| CN102914812A (en) * | 2011-08-04 | 2013-02-06 | 冠捷投资有限公司 | Light guide plate and backlight module |
| CN103308970A (en) * | 2012-03-07 | 2013-09-18 | 鸿富锦精密工业（深圳）有限公司 | Light guide plate and backlight module |
| CN103604066A (en) * | 2013-11-13 | 2014-02-26 | 深圳市华星光电技术有限公司 | Backlight module |
| CN103742834A (en) * | 2013-10-18 | 2014-04-23 | 友达光电股份有限公司 | Transparent display device and backlight module used by same |
| CN104849796A (en) * | 2015-03-19 | 2015-08-19 | 华南理工大学 | Micro-lens array light guide plate with adaptive spacing |
| CN109001856A (en) * | 2018-08-01 | 2018-12-14 | 深圳市华星光电技术有限公司 | Special-shaped light guide plate, backlight module and display device |
| CN114624810A (en) * | 2022-05-17 | 2022-06-14 | 深圳市北泰显示技术有限公司 | Backlight unit light source inclined touch screen |
| CN115236896A (en) * | 2022-07-26 | 2022-10-25 | 深圳市华星光电半导体显示技术有限公司 | Display backlight and display device |
-
2010
- 2010-01-07 CN CN201010300101A patent/CN101749612A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185065A (en) * | 2011-04-12 | 2011-09-14 | 武汉迪源光电科技有限公司 | Light-emitting diode with grating structure |
| CN102914812A (en) * | 2011-08-04 | 2013-02-06 | 冠捷投资有限公司 | Light guide plate and backlight module |
| CN103308970A (en) * | 2012-03-07 | 2013-09-18 | 鸿富锦精密工业（深圳）有限公司 | Light guide plate and backlight module |
| CN102889522A (en) * | 2012-09-25 | 2013-01-23 | 上海江燕电梯配件研究所 | Backlight component for liquid crystals |
| CN103742834B (en) * | 2013-10-18 | 2017-01-18 | 友达光电股份有限公司 | Transparent display device and backlight module used by same |
| CN103742834A (en) * | 2013-10-18 | 2014-04-23 | 友达光电股份有限公司 | Transparent display device and backlight module used by same |
| WO2015070452A1 (en) * | 2013-11-13 | 2015-05-21 | 深圳市华星光电技术有限公司 | Backlight module |
| CN103604066A (en) * | 2013-11-13 | 2014-02-26 | 深圳市华星光电技术有限公司 | Backlight module |
| CN104849796A (en) * | 2015-03-19 | 2015-08-19 | 华南理工大学 | Micro-lens array light guide plate with adaptive spacing |
| CN109001856A (en) * | 2018-08-01 | 2018-12-14 | 深圳市华星光电技术有限公司 | Special-shaped light guide plate, backlight module and display device |
| CN109001856B (en) * | 2018-08-01 | 2020-07-03 | 深圳市华星光电技术有限公司 | Special-shaped light guide plate, backlight module and display device |
| CN114624810A (en) * | 2022-05-17 | 2022-06-14 | 深圳市北泰显示技术有限公司 | Backlight unit light source inclined touch screen |
| CN115236896A (en) * | 2022-07-26 | 2022-10-25 | 深圳市华星光电半导体显示技术有限公司 | Display backlight and display device |
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Application publication date: 20100623 |