CN102969428B - Polarization white light emitting diode - Google Patents
Polarization white light emitting diode Download PDFInfo
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- CN102969428B CN102969428B CN201110270605.9A CN201110270605A CN102969428B CN 102969428 B CN102969428 B CN 102969428B CN 201110270605 A CN201110270605 A CN 201110270605A CN 102969428 B CN102969428 B CN 102969428B
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- emitting diode
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- fluorescence coating
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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
A kind of polarization white light emitting diode; it can reduce glare problem and increase extinction ratio; and it includes the light-emitting diode chip for backlight unit that can send one first coloured light; one fluorescence coating coating the periphery of light-emitting diode chip for backlight unit; and one to be arranged on fluorescence coating and directly not to contact with fluorescence coating; and form the wire grating polarizing layer of an air gap, impaired to protect wire grating polarizing layer to avoid.When the first coloured light penetrates fluorescence coating, understand fluorescence excitation layer and produce one second coloured light, first coloured light of part is then reflected by wire grating polarizing layer, and the first coloured light of part is produced repeatedly and the reflex of different directions in fluorescence coating and air gap, and then in fluorescence coating, form secondary excitation and produce the second coloured light, and wire grating polarizing layer can penetrate for a polarization 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]
Current white light emitting diode (lighting emitting diode on the market, LED), carry out the packaged type of mixed-color light by the light-emitting diode chip for backlight unit of multiple color and formed mostly, or adopt blue LED chip or ultraviolet light-emitting diodes chip, excite the packaged type of the fluorescent material of multiple color and formed.
Wherein, the light-emitting diode chip for backlight unit of multiple color is adopted to carry out the packaged type of mixed-color light, made white light emitting diode, though have the function of real-time Color tunable, but the difference of the making material because of the light-emitting diode chip for backlight unit of shades of colour, can cause white light emitting diode when temperature rises, its glow color changes, Colored light mixing not easily or the problem such as drive circuit is complicated.As for, adopt ultraviolet light-emitting diodes chip carry out excitated fluorescent powder and produce visible ray, and mix the mode of white light further, its shortcoming is that luminosity is not enough, and can produce unnecessary injury to user due to the transmitting of ultraviolet light.Therefore, adopt ultraviolet light-emitting diodes chip to carry out the packaged type of excitated fluorescent powder, its white light conversion efficiency must be promoted, and in encapsulating structure, increase by an optical module, go out to block ultraviolet light emission, and cause the injury of human eye.
The blue light utilizing blue LED chip to send to excite yellow fluorescent powder, and produces gold-tinted and makes the blue light of gold-tinted and part and form white light, is current modal white light emitting diode.But, adopt the white light-emitting diodes made by aforesaid way, its white light sent is in mixed light process, the intensity of blue light much larger than it excite the intensity of gold-tinted, therefore above-mentioned white light emitting diode has that thus colour temperature is higher produces dazzling problem, drill colour index cannot be promoted to and be greater than 80 simultaneously, and its intensity of light source produced and distribution of color uneven, and produce such as distribution of color there is the problems such as yellow circle phenomenon.In addition, the emission wavelength of blue LED chip can rise along with operating temperature and increase, and the color thus affecting the white light that its gold-tinted excited produces in time mixing with blue light changes.
But, no matter adopt the illuminating source of the white light emitting diode made by which kind of packaged type above-mentioned, all belong to non-polarization light.With application of throwing light on, non-polarization light can produce the problem of dazzle (glare) when reading, and makes user not feel well and cannot watch.Therefore, how making 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 current liquid crystal display (liquid crystal display, LCD), the framework of its display panel formed primarily of a liquid crystal layer, a film substrate, a backlight, about two polarisation diaphragms, a colored filter.Owing to adopting white light emitting diode as light source in backlight, and polarisation diaphragm can make the non-polarization white light that exported by backlight effectively, produce polarization and analyzing function, and the polarization white light causing white light emitting diode to send is when by liquid crystal layer, spatial light modulation (spatial light modulation) effect can be produced, and make liquid crystal display be able to effective operation.Therefore, if the output of polarization white light can be reached under the encapsulation technology of current white light emitting diode, the emitting brightness of liquid crystal can be increased, and reduce the use amount of polaroid in display and reduce costs.
The white light polarization produced to make white light emitting diode, below sketches the prior art of 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 light-emitting diode chip for backlight unit, and is arranged between two macromolecule filter membranous layers.Reflecting type polarizing device is arranged on phosphor powder layer.Light-emitting diode chip for backlight unit can send one first light, enters phosphor powder layer to excite generation one second light, then by after another macromolecule filter membranous layer outgoing, produce a polar biased light via reflecting type polarizing device after macromolecule filter membranous layer.Wherein, 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 being arranged at around a light-emitting diode chip for backlight unit by a reflector, and the polar biased light sent by light-emitting diode chip for backlight unit reflects to same direction, to export the polar biased light to the outgoing of same direction.
U.S. Patent number 7,339,736, in a non-polarization light front, arrange the reflecting type polarizing multilayer film made by a macromolecular material, non-polarization light can produce polarization light after reflecting type polarizing multilayer film, and can be applicable in the backlight of liquid crystal display to highlight.But, the reflecting type polarizing multilayer film made by macromolecular material, because of operating ambient temperature raise or expose to the sun impinge upon ultraviolet light environment under, easily produce rotten along with long-time operation.Therefore, how improving the environment tolerance of reflective multiple layer light polarizing film, is also 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 being applied to liquid crystal display highlights.Wherein, the structure of reflection-type wire grating polarizer, be that the metal wire array of the meter ruler cun by how is made on a transparency carrier, it has the advantages such as wider operating spectral, higher extinction ratio, larger rising angle and higher environment tolerance, but because its structure belongs to, how meter ruler is very little, therefore, how avoiding reflection-type wire grating polarizer to suffer damage, is also that the art is desired most ardently and one of dealt with problems.
[summary of the invention]
An object of the present invention is to provide a kind of polarization white light emitting diode, can improve its extinction ratio, reduce its colour temperature, slow down the change going out light color that temperature causes, and and then increase the uniformity 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 the use amount of polarisation diaphragm simultaneously, and then avoids the problem that polarisation diaphragm possibility is aging.
Other object of the present invention and advantage can be further understood from the technical characteristic disclosed by the present invention.
For reaching above-mentioned one or part or all objects or other object, a kind of polarization white light emitting diode of one embodiment of the invention, it is comprise a reflection substrate comprising electrode, a light-emitting diode chip for backlight unit, a fluorescence coating, a wire grating polarizing layer and a transparency carrier.Light-emitting diode chip for backlight unit system to be placed on reflection substrate and can to send one first coloured light.Fluorescence series of strata coat the periphery of light-emitting diode chip for backlight unit, when the first coloured light penetrates fluorescence coating, first coloured light is understood fluorescence excitation layer and produces one second coloured light, and the first coloured light system and the second Colored light mixing and produce a white light, wherein 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 a red fluorescence powder or a green emitting phosphor in addition, first coloured light is a blue light, and the second coloured light is a gold-tinted and can comprises a ruddiness or a green glow in addition.
Wire grating polarisation series of strata are arranged at above air gap, and directly do not contact fluorescence coating and form an air gap, and form an excitation cavity (pumping cavity) with reflection substrate, to make wire grating polarizing layer by the first color light reflective of part, and produce repeatedly in fluorescence coating and air gap and the reflection of many different directions, and wire grating polarizing layer can penetrate for white light.Transparency carrier system is arranged on wire grating polarizing layer, and wherein transparency carrier cording has a first surface and one of relative with first surface second surface, and first surface system contacts with wire grating polarizing layer, and white light system is penetrated by second surface.
In one embodiment, it more comprises one and is arranged at secondary optics assembly on the second surface of transparency carrier, and wherein secondary optics assembly can be a lenticule, a blooming or grating.
In one embodiment, first coloured light system comprises a transverse electric field wave and a transverse magnetic field wave, wire grating polarizing layer can reflect transverse electric field wave, and transverse electric field wave is produced repeatedly and the reflection of different directions in fluorescence coating and air gap, and wire grating polarizing layer can for the transverse electric field wave in the first coloured light, and the second coloured light excited in fluorescence coating when multiple reflections, the white light of mixed generation penetrates.
In one embodiment, bottom reflection substrate cording has one and four side plates, bottom and four side plates can form a groove, light-emitting diode chip for backlight unit system is arranged on bottom, fluorescence series of strata covering luminousing diode chip is also arranged in groove, and part the first coloured light can in excitation cavity multiple reflections, to produce the randomization effect (polarization randomization) of luminous deflection polarity.
In one embodiment, reflection substrate has one first connected groove and one second groove, 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, transparent adhesive tape series of strata are coated the periphery of light-emitting diode chip for backlight unit and are filled up the first groove, fluorescence series of strata are arranged at the second groove and cover substratum transparent, and part the first coloured light can in excitation cavity multiple reflections, to produce the randomization effect of luminous deflection polarity.
In one embodiment, air gap comprises a medium, and it can fill up or partly fill up air gap, and wherein the refractive index system of dielectric material is between 1 to 1.4, and is the refractive index being less than fluorescence coating.
In one embodiment, wire grating polarizing layer and transparency carrier are one-body molded.Wherein, wire grating polarizing layer comprises many metal line, and each metal linear system is reciprocally set in parallel on transparency carrier, and wire grating polarizing layer cording has a wiregrating cycle, and wiregrating periodic system is less than or equal to 300 how rice.Wire grating polarizing layer have one between 10% to 60% work period ratio, and its material system is selected from aluminium, tungsten, copper, silver and golden formed group.
[accompanying drawing explanation]
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
Medium 105b, 208b
Wire grating polarizing layer 106,209
Transparency carrier 107,210
First surface 107a, 210a
Second surface 107b, 210b
Secondary optics assembly 108,211
Metallic pin 203
Bonding wire 204
Substratum transparent 206
First groove V1
Second groove V2
[embodiment]
Aforementioned and other technology contents, feature and effect for the present invention, in the detailed description of following cooperation with reference to one of graphic preferred embodiment, can clearly present.The direction term mentioned in following examples such as: upper and lower, left and right, front or rear etc., is only for the direction with reference to alterations.Therefore, these direction terms are only for illustration of being not for limiting 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 reflection substrate 101, light-emitting diode chip for backlight unit 103, fluorescence coating 104, wire grating polarizing layer 106 and a transparency carrier 107.
Bottom reflection substrate 101 has one and four side plates, and bottom and four side plates can form a groove, light-emitting diode chip for backlight unit 103 is be arranged on the bottom of reflection substrate 101, wherein reflection substrate 101 is formed with a circuit (non-icon), and light-emitting diode chip for backlight unit 103 is be electrically connected on circuit, and drive this light-emitting diode chip for backlight unit 103 to send one first coloured light by impressed current, and then provide the light source needed for fluorescence excitation layer 104.Wherein, the first coloured light comprises a transverse electric field wave (transverse electric wave, TE wave) and a transverse magnetic field wave (transverse magnetic wave, TM wave), and in the present embodiment, the first coloured light is a blue light.
By on bottom that a reflector 102 is arranged at reflection substrate 101 and four side plates, it can be made around the inner periphery of the groove of reflection substrate 101.A blue light diode chip 103 is only illustrated in the present embodiment, light-emitting diode chip for backlight unit 103 is employing blue LED chip, wherein blue LED chip 103 can be such as the iii-v optoelectronic semiconductor chips such as gallium nitride (GaN), aluminum indium gallium nitride (InGaAlN) or aluminum gallium nitride (AlGaN), and can launch the blue light of a wavelength between 400 ~ 530nm.In addition, it according to different brightness demands, and can arrange multiple blue light diode chip 103 on reflection substrate 101, to produce required brightness, and can arrange blue LED chip 103 according to different array mode.
Fluorescence coating 104 is the periphery coating light-emitting diode chip for backlight unit 103, and covering luminousing diode chip 103 is arranged in the groove of reflection substrate 101 simultaneously, to make reflector 102 can around fluorescence coating 104 around.Wherein, fluorescence coating 104 is form mixed by a transparent adhesive tape and at least one fluorescent material, and fluorescent material is a yellow fluorescent powder, and a green emitting phosphor, a red fluorescence powder can be comprised, or by its etc. the colour mixture fluorescent material that combines, and under the different fluorescent material of cooperation, the first coloured light can excite the fluorescent material of different colours and send the second coloured light of different colours, and wherein the second coloured light is a gold-tinted and can comprises a ruddiness or a green glow.Because the light-emitting diode chip for backlight unit 103 in the present embodiment is employing blue LED chip, therefore fluorescence coating 104 wave-length coverage of blue light that can send for blue LED chip 103, and adopt the yellow fluorescent powder of proper proportion, and by be mixed in for blue light being a transparent transparent adhesive tape that mixing manufacture completes.Wherein, transparent adhesive tape in fluorescence coating 104 comprises an epoxy resin or a silica gel etc. and can be the colloid that visible ray penetrates, yellow fluorescent powder in fluorescence coating 104 can be such as a cerium dropped yttrium aluminum garnet (YAG) fluorescent material, terbium aluminium garnet (TAG) fluorescent material, or has silicate (silicates), nitrogen oxide (oxynitride), nitride (nitride) and phosphate (phosphates) fluorescent material etc. that europium (Eu) or cerium (Ce) adulterate.Because blue LED chip 103 is the blue light of emission wavelength between 400 ~ 530nm, it can yellow fluorescent powder in fluorescence excitation layer 104, and remaining blue light also can add two kinds of different colours light such as ruddiness or green glow with the gold-tinted excited and be mixed into white light.
Wire grating polarizing layer 106 is be arranged on fluorescence coating 104, but between wire grating polarizing layer 106 and fluorescence coating 104, cording has an air gap 105, by doing interval with air gap 105, and makes wire grating polarizing layer 106 can not directly contact fluorescence coating 104.Because wire grating polarizing layer 106 comprises many metal line, wherein the live width system 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 system of wire grating polarizing layer 106 is extremely trickle; extremely be easy to impaired; if impaired, wire grating polarizing layer 106 cannot act on; therefore an object of the present invention, utilizes air gap 105 to protect wire grating polarizing layer 106 exactly, to make wire grating polarizing layer 106 towards the metal wire of fluorescence coating 104; can not be impaired because of contact fluorescence coating 104, and polar biased light amount of light can be increased.Wherein air gap 105 can be filled up by a medium, and the refractive index system of the material of medium is between 1 to 1.4, and is the refractive index being less than fluorescence coating 104.
Coordinate with reference to Fig. 1, transparency carrier 107 is be arranged on wire grating polarizing layer 106, transparency carrier 107 have a first surface 107a with relative to one of first surface 107a second surface 107b, first surface 107a meeting contacting metal wiregrating polarizing layer 106, that is, each the metal linear system in wire grating polarizing layer 106 is reciprocally set in parallel on transparency carrier 107.Wherein, the material system of transparency carrier 107 can make the white light emitted by fluorescence coating 104 penetrate, and has a high penetration, and its material can be such as glass or macromolecular material.
Coordinate with reference to Fig. 2, in the present embodiment, wire grating polarizing layer 106 and transparency carrier 107 are one-body molded.Wherein, wire grating polarizing layer 106 has a wiregrating cycle, and wiregrating periodic system is less than or equal to 300 how rice, 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 golden formed group.The manufacture method of the metal wire of wire grating polarizing layer 106 is as follows: utilize how rice lithography (nano-lithpgraphy), electron beam lithography (electron beam lithography), full figure interferometry (holographic lithography) or how the method such as rice impression (nano-imprinting) make, the wire grating polarizing layer 106 with subwave rectangular line photoresistance pattern is formed on first surface 107a.Then, utilize photoresistance to peel off the mode such as (lift-off) or etching/plated film (etching/deposition), secondary wave length metal grating (subwavelengthgrating) is formed on first surface 107a.
Due to wire grating polarizing layer 106 having secondary wave length metal grating, therefore possess the function of polarization light, the visible ray of such as white light can be carried out multipath reflection and polarisation effect by it, and produces polarization white light.By said method, not only can produce polarization white light, more can make the light source that polarization white light emitting diode 100 sends, reach luminous intensity distribution uniformity, color stabilization and reduction colour temperature effect.In addition, can according to required optical reflection effect, and carry out design and fabrication for the material structure that such as width, thickness and material category etc. form the rete of wire grating polarizing layer 106, make it only the particular range of wavelengths of first coloured light launched by light-emitting diode chip for backlight unit 103 of some be reflected.
The effect of wire grating polarizing layer 106 is that it has the characteristic of portions of light reflection and some light transmission, and it has wider operating spectral simultaneously, and can produce polarization effect to the white light of multi-wavelength.In one embodiment, wire grating polarizing layer 106 has a polarization condition, it can make in the first coloured light the light with transverse magnetic field wave (TM) penetrate, and can reflect the light in the first coloured light with transverse electric field wave (TE), reaches the reflectivity higher than more than 95% simultaneously.
Because transverse electric field wave cannot meet the polarization condition of wire grating polarizing layer 106, and make it be subject to wire grating polarizing layer 106 to stop, 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 meet the polarization condition of wire grating polarizing layer 106, thus can penetrating metal wiregrating polarizing layer 106, and wire grating polarizing layer 106 can penetrate for the second coloured light be stimulated.That is, wire grating polarizing layer 106 can reflect transverse electric field wave in the first coloured light, on the other hand, the first coloured light that reflector 102 can make light-emitting diode chip for backlight unit 103 send, partly be confined between wire grating polarizing layer 106 and reflection substrate 101, and by wire grating polarizing layer 106 and reflection substrate 101 one of to form excitation cavity, and make transverse electric field wave in fluorescence coating 104 with air gap 105, produce repeatedly and the reflection of different directions, therefore make the transverse electric field wave in the first coloured light be able to repeatedly fluorescence excitation layer 104 and produce the randomization effect of the electric field deflection polarity of the second coloured light, until transverse electric field wave is converted to transverse magnetic field wave in the first coloured light, and the polarization white light of outgoing is formed with the second Colored light mixing, and after meeting the polarization condition of the wire grating polarizing layer 106 required by electromagnetic principle, begin penetrating metal wiregrating polarizing layer 106.
Because the visible light wave of wire grating polarizing layer 106 pairs of transverse electric field waves (TE) has high reflectance, thus light source can be reflected back and by the randomization (polarizationrandomization) in addition of its deflection polarity, finally give recycling again, and make it be converted to the light of transverse magnetic field wave (TM), and then penetrating metal wiregrating polarizing layer 106.By constantly repeating said process, therefore polarization white light emitting diode 100 effectively can 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, thus the fluorescent material making the first coloured light can pass through excitation cavity to try one's best in fluorescence excitation layer 104, reduce the first coloured light sent because of light-emitting diode chip for backlight unit 102 according to this too much, and produce polarization white light emitting diode 100 the too high problem of colour temperature, and the light wavelength conversion efficiency of fluorescent material can be improved, and excite more second coloured light, and then make 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 mainly system's employing blue LED chip, and be employing yellow fluorescent powder in its fluorescence coating 104, and collocation uses wire grating polarizing layer 106, to reach the effect producing polarization light white light.In order to avoid the wire grating polarizing layer 106 of the metal wire structure with how meter ruler cun is impaired, to increase environment tolerance and the extinction ratio of polarization white light emitting diode 100, wire grating polarizing layer 106 is had facing down of metal wire structure and is placed in above fluorescence coating 104 by the present invention, and arranges an air gap 105 between fluorescence coating 104 and wire grating polarizing layer 106.
Coordinate with reference to Fig. 3, 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 in second embodiment, with the different place of the structure of the polarization white light emitting diode 100 of the first embodiment, being only air gap 105 in polarization white light emitting diode 100a is by the gap of an air 105b, and the medium 105a of routine Ru substratum transparent formed one of below it, the refractive index system of its medium 105a between 1 to 1.4, and is the refractive index being 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 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 the present embodiment, secondary optics assembly 108 is a lenticule array, by the setting of lenticule array, effectively can promote polarization white light emitting diode 100b, the directive property (directivity) of the bright dipping of the polarization white light launched.
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 in the 4th embodiment, the mainly different place 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 fluorescence coating.A kind of polarization white light emitting diode 200 is mainly include reflection substrate 201, light-emitting diode chip for backlight unit 205, substratum transparent 206, fluorescence coating 207, wire grating polarizing layer 209 and a transparency carrier 210.
The material of reflection substrate 201 can be such as aluminium, silicon or Tao Ci etc., and by suitable processing mode on reflection substrate 201, and formed be connected one of the first groove V1 and one second groove V2, first groove V1 system is positioned at the below of the second groove V2, and the surface of the reflection substrate 201 exposed in the first groove V1 and the second groove V2 is formed with a reflector 202, and the material in reflector 202 can be such as aluminium, tungsten, copper, gold or silver-colored etc., can have the metal material of reflecting effect for visible ray.In addition, biseptate metallic pin 203 is be formed on substrate 201 and be penetrate through reflective substrate 201, and is electrically connected at anode and the negative electrode of light-emitting diode chip for backlight unit 205 respectively by a bonding wire 204.By impressed current in this little metallic pin 203, light-emitting diode chip for backlight unit 205 can be driven to send one first coloured light, and then the light source needed for fluorescence excitation layer 207 can be provided.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 be arranged on the first groove V1, substratum transparent 206 is the periphery 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 be arranged in the second groove V2 and cover with substratum transparent 206, and make reflector 202 can be surrounded on fluorescence coating 207 around.By the setting of substratum transparent 206, light-emitting diode chip for backlight unit 205 can be avoided to contact with the direct of fluorescence coating 207, and when polarization white light emitting diode 200 operates, can avoid light-emitting diode chip for backlight unit 205 when luminescence produces heat energy, cause the problem of the material degradation of fluorescence coating 207, and then luminous efficiency and the quality of polarization white light emitting diode 200 can be guaranteed.
In the present embodiment, light-emitting diode chip for backlight unit 205 is employing blue LED chip, and the employing of fluorescent material system mixes the yttrium-aluminium-garnet (YAG) of cerium (Ce) as yellow fluorescent powder in fluorescence coating 207, therefore the light of the first coloured light to be blue peak wavelength be 458nm, and the second coloured light is yellow peak wavelength is the light of 570nm, wiregrating cycle of wire grating polarizing layer 209 is then employing 288 how rice.Part blue light after entering fluorescence coating 207, can with fluorescence coating 207 in the yellow light mix that excites by blue light, and produce a non-polarization white light.By the setting of wire grating polarizing layer 209, the another Shu some blue light of non-fluorescence excitation layer 207 is after entering wire grating polarizing layer 209, to be reflected by wire grating polarizing layer 209 and fluorescence excitation layer 207 again, and produce 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 (extinction ratio) of wire grating polarizing layer 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, to maintain the stability of the glow color of the polarization white light that polarization white light emitting diode 200 is launched, and the high color temperature problem that blue light can be avoided to cause, so the average color temperature of polarization white light, be reduce about 60% compared with the average color temperature of non-polarization white light.
Coordinate with reference to Fig. 6, it describes the polarization white light emitting diode of the fifth embodiment of the present invention.The structure of the polarization white light emitting diode 200a in the 5th embodiment, with the different place of the structure of the polarization white light emitting diode 200 of the 4th embodiment, only being the air gap 208 in polarization white light emitting diode 200a, is be made up of the medium 208a of the routine Ru substratum transparent in one of the gap and below thereof of an air 208b.Wherein, the refractive index system of medium 208a between 1 to 1.4, and is the refractive index being 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 be arranged on the second surface 210b of transparency carrier 210, and secondary optics assembly 211 can be the blooming etc. of a plane, a lenticule, a grating or such as anti-reflective film.In the present embodiment, secondary optics assembly 211 is a lenticule array, by the setting of lenticule array, effectively can 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 sends a blue light by blue LED chip, and excite the fluorescence coating that is made up of yellow fluorescent powder and produce a gold-tinted.The blue light of part is formed white light by blue-light excited yellow light mix in meeting and fluorescence coating after entering fluorescence coating, and then launch a polarization white light by wire grating polarizing layer, wherein polarization white light is a transverse magnetic field wave (TM).Because wire grating polarisation series of strata are arranged on above fluorescence coating, there is the blue light of transverse electric field wave (TE) after being entered air gap and fluorescence coating by reflection, meeting fluorescence excitation layer again, and produce secondary excitation, and produce one or two non-polarization gold-tinteds.By having the multiple reflections effect of blue light between wire grating polarizing layer and reflection substrate of transverse electric field wave (TE), again can excite gold-tinted and mix generation non-polarization white light, and producing one or two polarization white lights via wire grating polarizing layer.Therefore, polarization white light emitting diode can reduce the amount of light of the blue light of outgoing to reduce colour temperature, and strengthens the transmission amount of polarization white light and increase extinction ratio.Meanwhile because blue light by repeatedly and different directions ground reflection, also can improve the uniformity of polarization white light emitting diode, and improve may Yin Wendu rise produce color tuning problems.
Above-mentioned explanation is mainly utilize the part reflection of wire grating polarizing layer and the characteristic of fractional transmission, with the randomization of the electric field deflection polarity of the non-polarization white light that light-emitting diode is sent (polarization randomization) effect, recycled and produced the output of polarization white light.Owing to there is an air gap between wire grating polarizing layer and fluorescence coating, when polarization white light emitting diode in operate time, can temperature be reduced, with avoid wire grating polarizing layer because of temperature effect impaired.In addition, on the second surface of glass substrate, secondary optics assembly (secondary optics) such as blooming, grating or lenticule battle array (micro-lens array) can be made, to increase range of application.
Therefore, the polarization white light emitting diode of the embodiment of the present invention has following advantage:
One, by the surface with metal wire of wire grating polarizing layer is arranged towards fluorescence coating; environment tolerance can be increased and improve extinction ratio; between wire grating polarizing layer and fluorescence coating, form an air gap simultaneously, wire grating polarizing layer can be protected to make it not easily damaged.
Two, the heat-resisting character of wire grating polarizing layer is good, and can not because of use for a long time and/or with environmental exposure and impaired.
Three, wire grating polarizing layer part first coloured light that light-emitting diode chip for backlight unit can be made to send, produce repeatedly and omnibearing reflection in fluorescence coating and air gap, and make fluorescent material repeatedly be excited generation second coloured light, therefore can significantly improving luminous efficiency, and then raising Luminescence Uniformity, and make it because using and heat damage for a long time, and can not 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, the use of polarisation diaphragm in known liquid crystal indicator can be saved further, and reach the object that a polarization white light source is effectively provided.
Five, the light sent due to polarization white light emitting diode is polarization white light, and it is when being applied in illumination, can reduce the problem of dazzle (glare) and can not produce sticky feeling to the eyes of user.
Six, the secondary optics assembly of such as optical thin film, grating or a lenticule array can be made further on transparency carrier, to increase range of application.
Only as described above, be only preferred embodiment of the present invention, when not limiting scope of the invention process with this, the simple equivalence namely generally done according to the present patent application the scope of the claims and invention description content changes and modifies, and all still remains within the scope of the patent.Any embodiment of the present invention or claim must not reach whole object disclosed by the present invention or advantage or feature in addition.In addition, summary part and title are only used to the use that auxiliary patent document is searched, and are not used for limiting interest field of the present invention.
Claims (10)
1. a polarization white light emitting diode, it comprises:
One reflection substrate;
One light-emitting diode chip for backlight unit, it is be arranged on this reflection substrate, and sends one first coloured light;
One fluorescence coating, it is the periphery coating this light-emitting diode chip for backlight unit, and wherein when this first coloured light penetrates 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 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 part of first coloured light, and form an excitation cavity with this reflection substrate, and then make in this fluorescence coating and this air gap, to be produced one repeatedly and the reflection of different directions by this first coloured light reflected, and this wire grating polarizing layer can penetrate for this white light; And
One transparency carrier, it is be arranged on this wire grating polarizing layer, and wherein this transparency carrier has a first surface and the second surface relative to this first surface, and this first surface system contacts with this wire grating polarizing layer, and this white light is by this second surface outgoing.
2. polarization white light emitting diode according to claim 1, is characterized in that, it also 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 transverse electric field wave can reflect by this wire grating polarizing layer, and make this transverse electric field wave in this fluorescence coating and this air gap, produce this repeatedly and the reflection of different directions, and this wire grating polarizing layer can penetrate for this white light after 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, bottom this reflection substrate has one and four side plates, bottom this and this four side plate can form a groove, this light-emitting diode chip for backlight unit is arranged on bottom this, 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 in this excitation cavity multiple reflections.
5. polarization white light emitting diode according to claim 3, it is characterized in that, this reflection substrate has one of connected 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 periphery 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 in this excitation cavity multiple reflections.
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 comprises a medium, and the refractive index of the material of this medium between 1 to 1.4, and is 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 is reciprocally set in parallel on this first surface of this transparency carrier, and this wire grating polarizing layer has a wiregrating cycle, this wiregrating cycle is less than or equal to 300 how rice.
10. polarization white light emitting diode according to claim 8, is characterized in that, this wire grating polarizing layer have one between 10% to 60% work period ratio.
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| CN103996778B (en) * | 2014-03-14 | 2017-06-13 | 苏州大学 | A kind of polarized light-emitting diode |
| TWI605288B (en) * | 2017-01-16 | 2017-11-11 | 友達光電股份有限公司 | Pixel structure and display panel having the 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 |
| 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 |
| 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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| TW200815787A (en) * | 2006-09-20 | 2008-04-01 | Ind Tech Res Inst | Polarization light source |
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