CN102969428A - Polarized white light emitting diode (LED) - Google Patents
Polarized white light emitting diode (LED) Download PDFInfo
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- CN102969428A CN102969428A CN2011102706059A CN201110270605A CN102969428A CN 102969428 A CN102969428 A CN 102969428A CN 2011102706059 A CN2011102706059 A CN 2011102706059A CN 201110270605 A CN201110270605 A CN 201110270605A CN 102969428 A CN102969428 A CN 102969428A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
- H01L2224/48247—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item
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Abstract
The invention relates to a polarized white LED which can reduce dazzle and increase extinction ratios. The polarized white LED comprises an LED chip, a fluorescent layer, a metal wire grid polarization layer, wherein the LED chip can emit first colored light, the fluorescent layer is coated on the periphery of the LED chip, and the metal wire grid polarization layer is arranged on the fluorescent layer but not contacted with the fluorescent layer directly to form an air gap to protect the metal wire grid polarization layer from being damaged. When the first colored light penetrates through the fluorescent layer, the fluorescent layer can be stimulated to generate second colored light, and part of the first colored light is reflected by the metal wire grid polarization layer, so that repeated reflection actions in different directions are produced by part of the first colored light in the fluorescent layer and the air gap, the fluorescent layer is further stimulated again to produce the second colored light, and the metal wire grid polarization layer can be penetrated by polarized white light.
Description
[technical field]
The present invention is relevant with a kind of white light emitting diode, particularly a kind of polarization white light emitting diode.
[background technology]
Present white light emitting diode (lighting emitting diode on the market, LED), that light-emitting diode chip for backlight unit by multiple color comes the packaged type of mixed-color light to form mostly, or adopt blue LED chip or ultraviolet light-emitting diodes chip, excite multiple color fluorescent material packaged type and form.
Wherein, the light-emitting diode chip for backlight unit of employing multiple color comes the packaged type of mixed-color light, made white light emitting diode, though have the adjustable function of real-time color, but the difference because of the making material of versicolor light-emitting diode chip for backlight unit, can cause white light emitting diode when temperature rises, the problem such as its glow color changes, Colored light mixing is difficult for or drive circuit is complicated.As for, adopting the ultraviolet light-emitting diodes chip to come excitated fluorescent powder and produce visible light, and further mix the mode of white light, its shortcoming is that luminosity is not enough, and because the emission meeting of ultraviolet light produces unnecessary injury to the user.Therefore, adopt the ultraviolet light-emitting diodes chip to come the packaged type of excitated fluorescent powder, must promote its white light conversion efficient, and in encapsulating structure, increase by an optical module, go out to block the ultraviolet emission, and cause the injury of human eye.
The blue light that utilizes blue LED chip to send excites yellow fluorescent powder, and produces gold-tinted and so that gold-tinted forms white light with the blue light of part, be present modal white light emitting diode.But, adopt the made white light-emitting diodes of aforesaid way, its white light that sends is in the mixed light process, the intensity of blue light is much larger than the intensity of its gold-tinted that excites, therefore it is higher thereby produce dazzling problem that above-mentioned white light emitting diode has colour temperature, drilling simultaneously colour index can't be promoted to greater than 80, and its intensity of light source that produces and distribution of color are inhomogeneous, and produces problems such as having yellow circle phenomenon such as distribution of color.In addition, the emission wavelength of blue LED chip can rise and increase along with operating temperature, thereby affects the change color of the white light that its gold-tinted that excites and blue light produce when mixing.
Yet, no matter adopt the illuminating source of the made white light emitting diode of above-mentioned which kind of packaged type, all belong to non-polarization light.Use with illumination, non-polarization light can produce the problem of dazzle (glare) when reading, and makes the user not feel well and can't watch.Therefore, how making the white light emitting diode polarization, and have High Extinction Ratio (extinction ratio) to reduce issuable glare problem, is that the art is desired most ardently and one of dealt with problems.
In addition, in the technology of present liquid crystal display (liquid crystal display, LCD), the framework of its display panel is mainly by a liquid crystal layer, a film substrate, a backlight, polarisation diaphragm, a colored filter are consisted of about in the of two.Owing to adopt white light emitting diode as light source in the backlight, and the polarisation diaphragm can be effectively so that the non-polarization white light of being exported by backlight, produce polarization and analyzing function, and cause polarization white light that white light emitting diode sends by liquid crystal layer the time, can produce spatial light modulation (spatial light modulation) effect, and so that liquid crystal display is able to effective operation.Therefore, if can under the encapsulation technology of present white light emitting diode, reach the output of polarization white light, can increase the emitting brightness of liquid crystal, and reduce polaroid in display use amount and reduce cost.
For so that the white light polarization that white light emitting diode produces, the prior art of below summary part.U.S. Patent number 7,091,661 mainly comprise a light-emitting diode chip for backlight unit, a phosphor powder layer and a reflecting type polarizing device (reflective polarizer).Phosphor powder layer is arranged on the light-emitting diode chip for backlight unit, and is arranged between the two macromolecule filter membranous layers.The reflecting type polarizing device is arranged on the phosphor powder layer.Light-emitting diode chip for backlight unit can send one first light, enters phosphor powder layer and produce one second light to excite behind the macromolecule filter membranous layer, by after another macromolecule filter membranous layer outgoing, produces a polar biased light via the reflecting type polarizing device again.Wherein, the reflecting type polarizing device adopts a polarizing multilayered film or an absorption-type light polarizing film.In addition, at U.S. Patent number 7,766, in 495, by a reflector is arranged at a light-emitting diode chip for backlight unit around, and the polar biased light that light-emitting diode chip for backlight unit sends is reflected to same direction, with the polar biased light of output to same direction outgoing.
U.S. Patent number 7,339,736 in a non-polarization light the place ahead, and the reflecting type polarizing multilayer film of a macromolecular material made is set, non-polarization light can produce polarization light through behind the reflecting type polarizing multilayer film, and can be applicable in the backlight of liquid crystal display to highlight.Yet the reflecting type polarizing multilayer film of macromolecular material made impinges upon under the environment of ultraviolet light because operating ambient temperature raises or exposes to the sun, and easily produces rotten along with long-time operation.Therefore, how improving the environment tolerance of reflective multilayer light polarizing film, also is that the art is desired most ardently and one of dealt with problems.
U.S. Patent number 7,614,757 adopt a reflection-type wire grating polarizer (reflectivemetallic wire-grid polarizer), and its backlight that is applied to liquid crystal display highlights.Wherein, the structure of reflection-type wire grating polarizer, how the very little metal wire array of meter ruler is made on the transparency carrier in system, it has wider work spectrum, higher extinction ratio, larger rising angle and higher advantages such as environment tolerance, how meter ruler is very little but because its structure belongs to, therefore, how avoiding reflection-type wire grating polarizer to suffer damage, also is that the art is desired most ardently and one of dealt with problems.
[summary of the invention]
A purpose of the present invention is to provide a kind of polarization white light emitting diode, can improve its extinction ratio, reduces its colour temperature, slow down the variation that goes out light color that temperature causes, and and then increase the uniformity that light color.In addition, the present invention can be applied to the backlight of liquid crystal display, to increase the amount of light of liquid crystal display, reduces simultaneously the use amount of polarisation diaphragm, and then the problem of avoiding the polarisation diaphragm to wear out.
Other purpose of the present invention and advantage can be further understood from the disclosed technical characterictic of the present invention.
For reaching above-mentioned one or part or whole purposes or other purpose, a kind of polarization white light emitting diode of one embodiment of the invention, it is to comprise that one comprises reflection substrate, a light-emitting diode chip for backlight unit, a fluorescence coating, a wire grating polarizing layer and a transparency carrier of electrode.Light-emitting diode chip for backlight unit system places on the reflection substrate and can send one first coloured light.The fluorescence series of strata are coated the periphery of light-emitting diode chip for backlight unit, when the first coloured light penetrates fluorescence coating, the first coloured light is understood the fluorescence excitation layer and is produced one second coloured light, and the first coloured light system produces a white light with the second Colored light mixing, wherein the fluorescence series of strata are mixed by a substratum transparent and at least one fluorescent material, and fluorescent material comprises a yellow fluorescent powder and can comprise in addition a red fluorescence powder or a green emitting phosphor, the first coloured light is a blue light, and the second coloured light is a gold-tinted and can comprises in addition a ruddiness or a green glow.
Wire grating polarisation series of strata are arranged at the top, air gap, and directly do not contact fluorescence coating and form an air gap, and form an excitation cavity (pumping cavity) with reflection substrate, so that the wire grating polarizing layer reflects the first coloured light partly, and produce in fluorescence coating and air gap repeatedly and the reflection of many different directions, and the wire grating polarizing layer can penetrate for white light.Transparency carrier system is arranged on the wire grating polarizing layer, and wherein the transparency carrier cording has a first surface and one of relative with first surface second surface, and first surface system contacts with the wire grating polarizing layer, and white light is to be penetrated by second surface.
In one embodiment, it comprises that more one is arranged at the secondary optics assembly on the second surface of transparency carrier, and wherein the secondary optics assembly can be a lenticule, a blooming or grating.
In one embodiment, the first coloured light system comprises a transverse electric field wave and a transverse magnetic field wave, the wire grating polarizing layer can reflect the transverse electric field wave, and so that the transverse electric field wave in fluorescence coating and air gap, produce repeatedly and the reflection of different directions, and the wire grating polarizing layer can be for the transverse electric field wave in the first coloured light, and the second coloured light that when Multi reflection, in fluorescence coating, excites, mix the white light that produces and penetrate.
In one embodiment, the reflection substrate cording has a bottom and four side plates, bottom and four side plates can consist of a groove, light-emitting diode chip for backlight unit system is arranged on the bottom, fluorescence series of strata covering luminousing diode chip also is arranged in the groove, and the first coloured light of part can be in excitation cavity Multi reflection, with the randomization effect (polarization randomization) that produces luminous deflection polarity.
In one embodiment, reflection substrate has one first continuous groove and one second groove, the first groove system is positioned at the below of the second groove, light-emitting diode chip for backlight unit system is arranged in the first groove, the transparent adhesive tape series of strata are coated the peripheral of light-emitting diode chip for backlight unit and are filled up the first groove, the fluorescence series of strata are arranged at the second groove and cover substratum transparent, and the first coloured light of part can be in excitation cavity Multi reflection, in order to produce the randomization effect of luminous deflection polarity.
In one embodiment, the air gap comprises a medium, and it can fill up or partly fill up the air gap, and wherein the refractive index of dielectric material is between 1 to 1.4, and is the refractive index less than fluorescence coating.
In one embodiment, wire grating polarizing layer and transparency carrier are one-body molded.Wherein, the wire grating polarizing layer comprises many metal line, and each metal linear system reciprocally is set in parallel on the transparency carrier, and wire grating polarizing layer cording has a wiregrating cycle, and wiregrating periodic system is less than or equal to 300 rice how.The wire grating polarizing layer has one between 10% to 60% work period ratio, and its material system is selected from aluminium, tungsten, copper, silver and the golden group that consists of.
[description of drawings]
Fig. 1 is the structural representation of the polarization white light emitting diode of first embodiment of the invention.
Fig. 2 is the structural representation of wire grating polarizing layer.
Fig. 3 is the structural representation of the polarization white light emitting diode of second embodiment of the invention.
Fig. 4 is the structural representation of the polarization white light emitting diode of third embodiment of the invention.
Fig. 5 is the structural representation of the polarization white light emitting diode of fourth embodiment of the invention.
Fig. 6 is the structural representation of the polarization white light emitting diode of fifth embodiment of the invention.
Fig. 7 is the structural representation of the polarization white light emitting diode of sixth embodiment of the invention.
[primary clustering symbol description]
Polarization white light emitting diode 100,100a, 100b, 200,200a, 200b
Reflection substrate 101,201
Reflector 102,202
Light-emitting diode chip for backlight unit 103,205
Fluorescence coating 104,207
Air gap 105,105a, 208,208a
Wire grating polarizing layer 106,209
Transparency carrier 107,210
Secondary optics assembly 108,211
Substratum transparent 206
The first groove V1
The second groove V2
[embodiment]
About aforementioned and other technology contents, characteristics and effect of the present invention, in the following detailed description that cooperates with reference to one of graphic preferred embodiment, can clearly present.The direction term of mentioning in following examples such as: upper and lower, left and right, front or rear etc., only is the direction for the reference alterations.Therefore, these direction terms only be for explanation be not be for the restriction the present invention.
Please refer to Fig. 1, it is the polarization white light emitting diode of first embodiment of the invention.One polarization white light emitting diode 100 includes a reflection substrate 101, a light-emitting diode chip for backlight unit 103, a fluorescence coating 104, a wire grating polarizing layer 106 and a transparency carrier 107.
By a reflector 102 is arranged on the bottom and four side plates of reflection substrate 101, can make it around the inner periphery of the groove of reflection substrate 101.In present embodiment, only illustrate a blue light diode chip 103, light-emitting diode chip for backlight unit 103 is the employing blue LED chip, wherein blue LED chip 103 can be such as being the III-V family optoelectronic semiconductor chips such as gallium nitride (GaN), aluminum indium gallium nitride (InGaAlN) or aluminum gallium nitride (AlGaN), and can launch a wavelength between the blue light of 400～530nm.In addition, it can be according to different brightness demands, and a plurality of blue light diode chips 103 are set on reflection substrate 101, producing required brightness, and can blue LED chip 103 be set according to different array modes.
Wire grating polarizing layer 106 is to be arranged on the fluorescence coating 104, but cording has an air gap 105 between wire grating polarizing layer 106 and the fluorescence coating 104, by doing the interval with air gap 105, and makes wire grating polarizing layer 106 can directly not contact fluorescence coating 104.Because wire grating polarizing layer 106 comprises many metal line, wherein the live width of each metal wire is between 30～180nm, and its thickness system is between 30～200nm.And the live width of each metal wire; namely the wiregrating live width of wire grating polarizing layer 106 system is extremely trickle; extremely be easy to impaired; if impaired then wire grating polarizing layer 106 can't act on; therefore one of purpose of the present invention utilizes air gap 105 to protect wire grating polarizing layer 106, so that wire grating polarizing layer 106 is towards the metal wire of fluorescence coating 104 exactly; can be not impaired because of contact fluorescence coating 104, and can increase polar biased light amount of light.Wherein air gap 105 can be filled up by a medium, and the refractive index of the material of medium system is between 1 to 1.4, and is the refractive index less than fluorescence coating 104.
Cooperation is with reference to Fig. 1, transparency carrier 107 is to be arranged on the wire grating polarizing layer 106, transparency carrier 107 have a first surface 107a with respect to one of first surface 107a second surface 107b, first surface 107a meeting contacting metal wiregrating polarizing layer 106, that is to say that each the metal linear system in the wire grating polarizing layer 106 reciprocally is set in parallel on the transparency carrier 107.Wherein, the material of transparency carrier 107 system can make by fluorescence coating 104 emitted white lights and penetrating, and has a high penetration, and its material can for example be glass or macromolecular material.
Cooperation is with reference to Fig. 2, and in present embodiment, wire grating polarizing layer 106 is one-body molded with transparency carrier 107.Wherein, wire grating polarizing layer 106 has a wiregrating cycle, and wiregrating periodic system is less than or equal to 300 rice how, have simultaneously one between 10% to 60% work period ratio (duty cycle ratio), and its material system is selected from aluminium, tungsten, copper, silver and the golden group that consists of.The manufacture method of the metal wire of wire grating polarizing layer 106 is as follows: how to utilize rice lithography (nano-lithpgraphy), electron beam lithography (electron beam lithography), full figure interferometry (holographic lithography) or how rice impression methods such as (nano-imprinting) is made, the wire grating polarizing layer 106 that will have the rectangular line photoresistance of subwave pattern is formed on the first surface 107a.Then, utilize photoresistance to peel off the modes such as (lift-off) or etching/plated film (etching/deposition), inferior wavelength metal grating (subwavelengthgrating) is formed on the first surface 107a.
Owing to have inferior wavelength metal grating on the wire grating polarizing layer 106, therefore possess the function of polarization light, it can carry out the visible light of for example white light multipath reflection and polarisation effect, and produces the polarization white light.By said method, not only can produce the polarization white light, more can be so that the light source that polarization white light emitting diode 100 sends reaches being evenly distributed of luminous intensity, color stabilization and reduction colour temperature effect.In addition, can be according to required optical reflection effect, and carry out design and fabrication for the material structure of the rete of formation wire grating polarizing layers 106 such as width, thickness and material category, it is only reflected the particular range of wavelengths of first coloured light of being launched by light-emitting diode chip for backlight unit 103 of some.
The effect of wire grating polarizing layer 106 is that it has portions of light reflection and the light transmissive characteristic of part, and it has wider work spectrum simultaneously, and can be to the generating white light polarization effect of multi-wavelength.In one embodiment, wire grating polarizing layer 106 has a polarization condition, it can make the light that has transverse magnetic field wave (TM) in the first coloured light penetrate, and can reflect the light that has transverse electric field wave (TE) in the first coloured light, reaches simultaneously the reflectivity that is higher than more than 95%.
Because the transverse electric field wave can't satisfy the polarization condition of wire grating polarizing layer 106, stop and make it be subject to wire grating polarizing layer 106, and then in the first surface 107a of transparency carrier 107, produce reflex; And the transverse magnetic field wave in the first coloured light can satisfy the polarization condition of wire grating polarizing layer 106, thereby penetrable wire grating polarizing layer 106, and wire grating polarizing layer 106 can penetrate for the second coloured light that is stimulated.That is to say, wire grating polarizing layer 106 can reflect transverse electric field wave in the first coloured light, on the other hand, reflector 102 can be so that the first coloured light that light-emitting diode chip for backlight unit 103 sends, partly be confined between wire grating polarizing layer 106 and the reflection substrate 101, and one of form excitation cavity by wire grating polarizing layer 106 and reflection substrate 101, and so that the transverse electric field wave in fluorescence coating 104 and air gap 105, produce repeatedly and the reflection of different directions, therefore so that being able to repeatedly fluorescence excitation layer 104, the transverse electric field wave in the first coloured light produces the randomization effect of the electric field deflection polarity of the second coloured light, until the transverse electric field wave is converted to transverse magnetic field wave in the first coloured light, and form the polarization white light of outgoing with the second Colored light mixing, and after satisfying the polarization condition of the desired wire grating polarizing layer 106 of electromagnetic principle, penetrating metal wiregrating polarizing layer 106 begins.
Because the visible light wave of 106 pairs of transverse electric field waves of wire grating polarizing layer (TE) has high reflectance, thereby it can be reflected back light source and with the in addition randomization (polarizationrandomization) of its deflection polarity, give again at last recycling, and make its light that is converted to transverse magnetic field wave (TM), and then penetrating metal wiregrating polarizing layer 106.By constantly repeating said process, so polarization white light emitting diode 100 can effectively promote extinction ratio, amount of light and polarization conversion efficiency thereof.
As mentioned above, because wire grating polarizing layer 106 and reflection substrate 101 form an excitation cavity, thereby so that the first coloured light can see through try one's best fluorescent material in the fluorescence excitation layer 104 of excitation cavity, it is too much to reduce according to this first coloured light that sends because of light-emitting diode chip for backlight unit 102, and produce polarization white light emitting diode 100 the too high problem of colour temperature, and can improve the light wavelength conversion efficient of fluorescent material, and excite more the second coloured light, and then so that polarization white light emitting diode 100 can produce the white light of more polarizations.The white light of polarization can enter the first surface 107a of transparency carrier 107, and by second surface 107b outgoing.
In the encapsulating structure of polarization white light emitting diode 100 of the present invention, its light-emitting diode chip for backlight unit 103 main systems adopt blue LED chip, and be the employing yellow fluorescent powder in its fluorescence coating 104, and collocation use wire grating polarizing layer 106, to reach the effect that produces polarization light white light.Wire grating polarizing layer 106 for fear of the metal wire structure with meter ruler how cun is impaired, to increase environment tolerance and the extinction ratio of polarization white light emitting diode 100, the present invention has facing down of metal wire structure with wire grating polarizing layer 106 and places fluorescence coating 104 tops, and between fluorescence coating 104 and wire grating polarizing layer 106 air gap 105 is set.
Cooperation is with reference to Fig. 3, and it describes the polarization white light emitting diode of the second embodiment of the present invention.The structure of polarization white light emitting diode 100a among the second embodiment, different locating with the structure of the polarization white light emitting diode 100 of the first embodiment, be by crack between the air 105b for polarization white light emitting diode 100a Air gap 105 only, with and the medium 105a of the routine Ru substratum transparent in one of below consisted of, the refractive index of its medium 105a is between 1 to 1.4, and is the refractive index less than fluorescence coating 104.
Please refer to Fig. 4, it describes the polarization white light emitting diode of third embodiment of the invention.Polarization white light emitting diode 100b more comprises a secondary optics assembly 108, it is to be arranged on the second surface 107b of transparency carrier 107, and secondary optics assembly 108 can comprise a plane, a lenticule, a grating or a blooming such as anti-reflective film etc.In present embodiment, secondary optics assembly 108 is a lenticule array, by the setting of lenticule array, can effectively promote polarization white light emitting diode 100b, the directive property (directivity) of the bright dipping of the polarization white light of launching.
Please refer to Fig. 5, it is the polarization white light emitting diode of fourth embodiment of the invention.The structure of the polarization white light emitting diode 200 among the 4th embodiment, main different the locating with the structure of the polarization white light emitting diode 100 of the first embodiment is the configuration between reflection substrate, light-emitting diode chip for backlight unit and the fluorescence coating.A kind of polarization white light emitting diode 200, the owner will include a reflection substrate 201, a light-emitting diode chip for backlight unit 205, a substratum transparent 206, a fluorescence coating 207, a wire grating polarizing layer 209 and a transparency carrier 210.
The material of reflection substrate 201 can be such as being aluminium, silicon or Tao Ci etc., and can pass through suitable processing mode on the reflection substrate 201, and one of form to link to each other the first groove V1 and one second groove V2, the first groove V1 system is positioned at the below of the second groove V2, and on the surface of the reflection substrate 201 that the first groove V1 and the second groove V2 expose, be formed with a reflector 202, and the material in reflector 202 can such as being aluminium, tungsten, copper, gold or silver-colored etc., can have for visible light the metal material of reflecting effect.In addition, biseptate metal pin 203 is to be formed on the substrate 201 and is penetrate through reflective substrate 201, and is electrically connected at respectively anode and the negative electrode of light-emitting diode chip for backlight unit 205 by a bonding wire 204.In these a little metal pins 203, can drive light-emitting diode chip for backlight unit 205 sending one first coloured light by impressed current, and then can provide fluorescence excitation layer 207 required light source.Wherein, the first coloured light comprises a transverse electric field wave and a transverse magnetic field wave.
Light-emitting diode chip for backlight unit 205 is to be arranged on the first groove V1, substratum transparent 206 is the periphery of coating light-emitting diode chip for backlight unit 205, and fill up the first groove V1, with complete covering luminousing diode chip 205, and fluorescence coating 207 is to be arranged in the second groove V2 and to cover with substratum transparent 206, and so that reflector 202 can be surrounded on fluorescence coating 207 around.Setting by substratum transparent 206, can avoid light-emitting diode chip for backlight unit 205 to contact with the direct of fluorescence coating 207, and when 200 operation of polarization white light emitting diode, can avoid light-emitting diode chip for backlight unit 205 when luminous generation heat energy, the problem that causes the material degradation of fluorescence coating 207, and then can guarantee luminous efficiency and the quality of polarization white light emitting diode 200.
In present embodiment, light-emitting diode chip for backlight unit 205 is the employing blue LED chip, and the employing of fluorescent material system is mixed the yttrium-aluminium-garnet (YAG) of cerium (Ce) as yellow fluorescent powder in the fluorescence coating 207, therefore the first coloured light is that blue light spike length is the light of 458nm, and the second coloured light be the yellow peak wavelength is the light of 570nm, and the wiregrating cycle of wire grating polarizing layer 209 then is to adopt 288 rice how.Part blue light can be interior by the yellow light mix that blue light excited with fluorescence coating 207 after entering fluorescence coating 207, and produce a non-polarization white light.Setting by wire grating polarizing layer 209, the in addition Shu part blue light of fluorescence excitation layer 207 is not after entering wire grating polarizing layer 209, will be by wire grating polarizing layer 209 reflection and fluorescence excitation layer 207 again, and generation secondary gold-tinted, and again mix with blue light, and produce a non-polarization white light, so polarization white light average penetration light intensity can be 60% of non-polarization white light light intensity, wherein the average extinction ratio of wire grating polarizing layer (extinction ratio) is 330.Therefore, wire grating polarizing layer 209 can promote the amount of penetrating of polarization white light emitting diode 200, and produce the polar biased effect of multi-angle and multi-wavelength, and make polarization white light emitting diode 200 produce a polarization white light.
In addition, wire grating polarizing layer 209 more can prevent blue LED chip 205, launch too much blue light to polarization white light emitting diode 200, stability with the glow color of keeping the polarization white light that polarization white light emitting diode 200 launched, and the high color temperature problem that can avoid blue light to cause, so the average color temperature of polarization white light is that the average color temperature than the non-polarization white light reduces about 60%.
Cooperation is with reference to Fig. 6, and it describes the polarization white light emitting diode of the fifth embodiment of the present invention.The structure of polarization white light emitting diode 200a among the 5th embodiment, different locating with the structure of the polarization white light emitting diode 200 of the 4th embodiment, only being the air gap 208 among the polarization white light emitting diode 200a, is that the medium 208a by the routine Ru substratum transparent in one of crack and below thereof between the air 208b is consisted of.Wherein, the refractive index of medium 208a is between 1 to 1.4, and is the refractive index less than fluorescence coating 207.
Please refer to Fig. 7, it describes the polarization white light emitting diode of sixth embodiment of the invention.Polarization white light emitting diode 200b more can comprise a secondary optics assembly 211, it is to be arranged on the second surface 210b of transparency carrier 210, and secondary optics assembly 211 can for a plane, a lenticule, a grating or one such as blooming of anti-reflective film etc.In present embodiment, secondary optics assembly 211 is a lenticule array, by the setting of lenticule array, can effectively promote the bright dipping directive property of the polarization white light that polarization white light emitting diode 200b launches.
In sum, polarization white light emitting diode 100,100a, 100b, 200,200a and 200b system send a blue light by blue LED chip, and excite the fluorescence coating that is comprised of yellow fluorescent powder and produce a gold-tinted.The part blue light after entering fluorescence coating can with fluorescence coating in formed white light by blue-light excited yellow light mix, then launch a polarization white light by the wire grating polarizing layer, wherein the polarization white light is a transverse magnetic field wave (TM).Because wire grating polarisation series of strata are arranged on fluorescence coating top, the blue light with transverse electric field wave (TE) be reflected enter air gap and fluorescence coating after, fluorescence excitation layer again, and generation secondary excitation, and produce a secondary non-polarization gold-tinted.By the Multi reflection effect of blue light between wire grating polarizing layer and reflection substrate with transverse electric field wave (TE), can again excite gold-tinted and mix and generate the non-polarization white light, and produce a secondary polarization white light via the wire grating polarizing layer.Therefore, the polarization white light emitting diode can reduce the amount of light of blue light of outgoing reducing colour temperature, and strengthens the transmission amount of polarization white light and increase extinction ratio.Simultaneously, because blue light by repeatedly and the reflection on different directions ground, also can improve the uniformity of polarization white light emitting diode, and improve the change color problem that may Yin Wendu rises and produce.
Above-mentioned explanation mainly is the characteristic of utilizing the reflection of the part of wire grating polarizing layer and part transmission, with randomization (polarization randomization) effect with the electric field deflection polarity of the non-polarization white light that light-emitting diode was sent, in addition recycling and produce the output of polarization white light.Owing to have an air gap between wire grating polarizing layer and the fluorescence coating, when polarization white light emitting diode during in operation, can reduce temperature, impaired because of temperature effect to avoid the wire grating polarizing layer.In addition, on the second surface of glass substrate, can make secondary optics assembly (secondary optics) for example blooming, grating or lenticule battle array (micro-lens array), to increase range of application.
Therefore, the polarization white light emitting diode of the embodiment of the invention has following advantage:
One, arranges towards fluorescence coating by the surface with metal wire with the wire grating polarizing layer; can increase the environment tolerance and improve extinction ratio; form simultaneously an air gap between wire grating polarizing layer and fluorescence coating, it is impaired to protect the wire grating polarizing layer that it is difficult for.
Two, the heat-resisting character of wire grating polarizing layer is good, and can be because of long-time use and/or impaired with environmental exposure.
Three, the meeting of wire grating polarizing layer is so that part the first coloured light that light-emitting diode chip for backlight unit sends, in fluorescence coating and air gap, produce repeatedly and omnibearing reflection, and so that fluorescent material is excited generation the second coloured light repeatedly, therefore improving luminous efficiency significantly, and then raising Luminescence Uniformity, and make it can not use heat damage because of long-time, and can slow down glow color with temperature drift (color shift) phenomenon and reduction colour temperature.
Four, by the setting of wire grating polarizing layer, if the present invention is applied on the backlight module of liquid crystal indicator, can further save the use of polarisation diaphragm in the known liquid crystal indicator, and reach the purpose of effective supply one polarization white light source.
Five, because the light that sends of polarization white light emitting diode is the polarization white light, it is aspect being applied to illumination the time, can reduce the problem of dazzle (glare) and can not produce sticky feeling to user's eyes.
Six, on transparency carrier, can further make the secondary optics assembly of optical thin film, grating or lenticule array for example, to increase range of application.
The above person of thought, it only is preferred embodiment of the present invention, when not limiting scope of the invention process with this, the simple equivalence of namely generally doing according to the present patent application claim and invention description content changes and modifies, and all still belongs in the scope that patent of the present invention contains.Arbitrary embodiment of the present invention or claim must not reached the disclosed whole purposes of the present invention or advantage or characteristics in addition.In addition, summary part and title only are the usefulness that auxiliary patent document is searched, and are not to limit interest field of the present invention.
Claims (10)
1. polarization white light emitting diode, it comprises:
One reflection substrate;
One light-emitting diode chip for backlight unit, it is to be arranged on this reflection substrate, and sends one first coloured light;
One fluorescence coating, it is the periphery of coating this light-emitting diode chip for backlight unit, wherein when this first coloured light penetrated this fluorescence coating, this first coloured light can excite this fluorescence coating and produce one second coloured light, and this first coloured light can produce a white light with this second Colored light mixing;
One wire grating polarizing layer, it is to be arranged on this fluorescence coating, and directly do not contact with this fluorescence coating and form an air gap, wherein this wire grating polarizing layer can reflect this a part of first coloured light, and form an excitation cavity with this reflection substrate, and then so that this that is reflected the first coloured light produce one repeatedly in this fluorescence coating and this air gap and the reflection of different directions, and this wire grating polarizing layer can penetrate for this white light; And
One transparency carrier, it is to be arranged on this wire grating polarizing layer, wherein this transparency carrier have a first surface with respect to a second surface of this first surface, this first surface system contacts with this wire grating polarizing layer, this white light is by this second surface outgoing.
2. polarization white light emitting diode according to claim 1 is characterized in that, it more comprises a secondary optics assembly, and it is arranged on this second surface of this transparency carrier.
3. polarization white light emitting diode according to claim 1, it is characterized in that, this first coloured light comprises a transverse electric field wave and a transverse magnetic field wave, this wire grating polarizing layer can be with this transverse electric field wave reflection, and so that this transverse electric field wave produces this repeatedly and the reflection of different directions in this fluorescence coating and this air gap, and this wire grating polarizing layer can penetrate for this white light behind this transverse magnetic field wave and this second Colored light mixing.
4. polarization white light emitting diode according to claim 3, it is characterized in that, this reflection substrate has a bottom and four side plates, this bottom and this four side plate can consist of a groove, this light-emitting diode chip for backlight unit is arranged on this bottom, this fluorescence coating covers this light-emitting diode chip for backlight unit and is arranged in this groove, and this transverse electric field wave can be in this excitation cavity Multi reflection.
5. polarization white light emitting diode according to claim 3, it is characterized in that, this reflection substrate has one of continuous the first groove and one second groove, this the first groove is positioned at the below of this second groove, this light-emitting diode chip for backlight unit is arranged in this first groove, this reflection substrate comprises a substratum transparent, this substratum transparent is coated the peripheral of this light-emitting diode chip for backlight unit and is filled up this first groove, this fluorescence coating is arranged at this second groove and covers this substratum transparent, and this transverse electric field wave can be in this excitation cavity Multi reflection.
6. polarization white light emitting diode according to claim 1 is characterized in that, this fluorescence coating is mixed by a transparent adhesive tape and at least one fluorescent material, and this fluorescent material is a yellow fluorescent powder.
7. polarization white light emitting diode according to claim 1 is characterized in that, this air gap can comprise a medium, and the refractive index of the material of this medium is between 1 to 1.4, and less than the refractive index of this fluorescence coating.
8. polarization white light emitting diode according to claim 1 is characterized in that, this wire grating polarizing layer and this transparency carrier are formed in one.
9. polarization white light emitting diode according to claim 8, it is characterized in that, this wire grating polarizing layer comprises many metal line, each this metal wire reciprocally is set in parallel on this first surface of this transparency carrier, and this wire grating polarizing layer has a wiregrating cycle, and this wiregrating cycle is less than or equal to 300 rice how.
10. polarization white light emitting diode according to claim 8 is characterized in that, this wire grating polarizing layer has one between 10% to 60% work period ratio.
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| CN103996778A (en) * | 2014-03-14 | 2014-08-20 | 苏州大学 | Polarized luminescence light-emitting diode |
| CN106842680A (en) * | 2017-01-16 | 2017-06-13 | 友达光电股份有限公司 | Pixel structure and display panel with same |
| CN107544180A (en) * | 2017-09-26 | 2018-01-05 | 京东方科技集团股份有限公司 | Light emitting diode, backlight module and liquid crystal display device |
| JP2020004769A (en) * | 2018-06-25 | 2020-01-09 | 日本電気硝子株式会社 | Airtight package and manufacturing method thereof |
| CN113985641A (en) * | 2021-10-26 | 2022-01-28 | Tcl华星光电技术有限公司 | Color film substrate, display panel and manufacturing method of color film substrate |
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| US20070047214A1 (en) * | 2005-08-30 | 2007-03-01 | Samsung Electronics Co., Ltd. | Backlight unit using wire-grid polarizer and liquid crystal display apparatus employing the backlight unit |
| US20080068712A1 (en) * | 2006-09-20 | 2008-03-20 | Industrial Technology Research Institute | Polarization Beam Source |
| CN101476684A (en) * | 2009-02-09 | 2009-07-08 | 友达光电股份有限公司 | Back light module and liquid crystal display |
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| US20070047214A1 (en) * | 2005-08-30 | 2007-03-01 | Samsung Electronics Co., Ltd. | Backlight unit using wire-grid polarizer and liquid crystal display apparatus employing the backlight unit |
| US20080068712A1 (en) * | 2006-09-20 | 2008-03-20 | Industrial Technology Research Institute | Polarization Beam Source |
| CN101476684A (en) * | 2009-02-09 | 2009-07-08 | 友达光电股份有限公司 | Back light module and liquid crystal display |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103996778A (en) * | 2014-03-14 | 2014-08-20 | 苏州大学 | Polarized luminescence light-emitting diode |
| CN103996778B (en) * | 2014-03-14 | 2017-06-13 | 苏州大学 | A kind of polarized light-emitting diode |
| CN106842680A (en) * | 2017-01-16 | 2017-06-13 | 友达光电股份有限公司 | Pixel structure and display panel with same |
| CN107544180A (en) * | 2017-09-26 | 2018-01-05 | 京东方科技集团股份有限公司 | Light emitting diode, backlight module and liquid crystal display device |
| US10566505B2 (en) | 2017-09-26 | 2020-02-18 | Boe Technology Group Co., Ltd. | Light-emitting diode, backlight module, and liquid crystal display device |
| JP2020004769A (en) * | 2018-06-25 | 2020-01-09 | 日本電気硝子株式会社 | Airtight package and manufacturing method thereof |
| JP7155658B2 (en) | 2018-06-25 | 2022-10-19 | 日本電気硝子株式会社 | Hermetic package and method for manufacturing hermetic package |
| CN113985641A (en) * | 2021-10-26 | 2022-01-28 | Tcl华星光电技术有限公司 | Color film substrate, display panel and manufacturing method of color film substrate |
| CN113985641B (en) * | 2021-10-26 | 2023-12-01 | Tcl华星光电技术有限公司 | Color film substrate, display panel and manufacturing method of color film substrate |
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| CN102969428B (en) | 2015-08-05 |
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