CN103858033B - Autostereoscopic display lighting apparatus and the autostereoscopic display apparatus comprising it - Google Patents
Autostereoscopic display lighting apparatus and the autostereoscopic display apparatus comprising it Download PDFInfo
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- CN103858033B CN103858033B CN201280049709.XA CN201280049709A CN103858033B CN 103858033 B CN103858033 B CN 103858033B CN 201280049709 A CN201280049709 A CN 201280049709A CN 103858033 B CN103858033 B CN 103858033B
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
- G02B6/001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type the light being emitted along at least a portion of the lateral surface of the fibre
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Liquid Crystal (AREA)
Abstract
Embodiments of the present invention are usually related to comprising one or more optical fiber(I.e. flexible astigmatism waveguide)Autostereoscopic display apparatus lighting apparatus(110), one or more described optical fiber is as linear photophore for illuminating autostereoscopic display apparatus(100)Interior display board(130)Pixel column(113).In some embodiments, linear photophore is limited by simple optical fiber, and the simple optical fiber is arranged on substrate with serpentine fashion(112)On, to form linear photophore array.In some embodiments, linear photophore is limited by multifiber.The lighting apparatus of some embodiments may also include the prism apparatus for being configured to produce multiple optical fiber images(140).
Description
The cross reference of related application
This application claims the priority for the US application serial the 61/546303rd submitted on October 12nd, 2011, this paper
It is based on this application and its full text is incorporated herein by reference.
Background
Embodiments of the present invention are related to autostereoscopic display lighting apparatus, more particularly, to including one or more
The autostereoscopic display lighting apparatus of optical fiber.Embodiments of the present invention further relate to the automatic stereo containing optical fibre illumination equipment and shown
Showing device.
The content of the invention
Autostereoscopic display apparatus can produce 3-D view, and special glasses are worn without observer(For example, actively
Formula shutter glasses or passive type polarising glass).Such autostereoscopic display apparatus can pass through illumination display board(Such as liquid crystal display
Plate)Pixel column so that each eyes of observer see the different pixels of panel to produce 3-D view.By to aobvious
Show that the single pixel in plate is addressed, so as to produce three dimensional impression, because each eyes are it is seen that what correspondence was shown
The different pixels series of image.
Pixel column is illuminated by the linear photophore behind display board so that the light of linear photophore transmitting passes through aobvious
Show the pixel of plate, and by extra Optical devices, observed person sees.Linear photophore should be able to produce enough light,
To produce the image with enough brightness.Conventional linear photophore may include xenon flash lamp, fluorescent lamp, incandescent lamp and light-emitting diodes
Pipe(LED).
Although by LED(Such as White LED)The linear photophore constituted can produce substantial amounts of light, but such linear luminous
Device is probably expensive, because needing many LED for each linear photophore of display.In addition, N number of simultaneously for generation
The display system in the visual field, it can be seen that the pitch that linear photophore is placed should be approximately equal to N times of display board pixel pitch.As
Example and it is unrestricted, for display 9 simultaneously the visual field 1080p display devices, it may be desirable to about 213 linear photophores(1920/
9).
Further, it is desirable to which linear photophore is thin as far as possible, to avoid the crosstalk between the visual field produced.If linear luminous
The angle extension increase of the width increase of device, the then light cone of single photophore transmitting, so that single visual field window is no longer separated.Example
Such as, it may be large enough to produce the crosstalk between the visual field by the single LED linear photophores constituted.
Embodiments of the present invention are related to the lighting apparatus for autostereoscopic display apparatus, and it uses one or more light
Fibre, one or more described fibre optic construction is into causing light to be come out from the side-scattered of optical fiber or diffusion, so that light is directed to
The fibre core of optical fiber is left and by outer surface, to provide linear lighting.Terms used herein " flexible astigmatism waveguide " refers to this
Type optical fiber.The optical fiber is also referred to as " light leak is fine ", because light leaks from the side of optical fiber(For example, scattering or diffusion)Out.
The linear photophore that optical fiber is used as the lighting apparatus for autostereoscopic display apparatus is had into following some advantages,
Including but not limited to, cost is reduced(Because reducing required independent photophore(Such as LED)), and reduce linear luminous
The width of device is to prevent the crosstalk between the visual field.
Brief description of the drawings
When reading the detailed description of the following embodiment to the present invention in conjunction with the following drawings, it can be formed most
Identical structure is presented with like reference characters in good understanding, accompanying drawing, wherein:
Figure 1A is the illumination of the autostereoscopic display apparatus according to one or more embodiments shown and described herein
The front-view schematic diagram of equipment and display board;
Figure 1B is the partial front schematic diagram of the lighting apparatus shown in Figure 1A;
Fig. 1 C are by the observer visual field of the optical fibre illumination according to one or more embodiments shown and described herein
Pixel schematic diagram;
Fig. 1 D are the partial schematic diagrams of the lighting apparatus according to one or more embodiments shown and described herein;
Fig. 2 is the front-view schematic diagram of the lighting apparatus according to one or more embodiments shown and described herein;
Fig. 3 A are by the rib of the autostereoscopic display apparatus according to one or more embodiments shown and described herein
The schematic top view for the optical fiber image that lens device is produced;
Fig. 3 B are the schematic side views of the prism apparatus according to one or more embodiments shown and described herein;
Fig. 4 is the schematic side view of the part of exemplary light diffusion optical fiber;
Fig. 5 is to be observed according to Fig. 4 of one or more embodiments shown and described herein optical fiber along direction 2-2
Cross-sectional view;
Fig. 6 A are the schematic diagrames of relative index of refraction-fiber radius of exemplary light diffusion optical fiber;
Fig. 6 B are the schematic diagrames of relative index of refraction-fiber radius of another exemplary light diffusion optical fiber;And
Fig. 6 C show another exemplary light diffusion optical fiber.
It is described in detail
The following detailed description of the preferred embodiment of the present invention, the example of these embodiments is shown in the drawings.As long as
It is possible to, makes same or similar part is denoted by the same reference numerals in all of the figs.
The following detailed description represents the overview for being used for providing the property and characteristic that understand claimed invention
Or the embodiment of framework.Appended accompanying drawing provides further understanding to the claim of the present invention, and accompanying drawing constitutes specification
A part.Illustrated the present invention various embodiments, and together with specification be used for explain claimed
The principle of invention embodiment and operation.
Various modifications and variations can be made to example within the scope of the present invention, can be by each side of different examples
Face is combined in a different manner, to obtain other example.Therefore, the true scope of claim of the invention should be from whole
Specification understands, may be referred to embodiment as described herein, but be not limited except as.
Embodiments of the present invention are usually related to comprising one or more optical fiber(I.e. flexible light diffusion waveguide)It is automatic
3 d display device lighting apparatus, one or more described optical fiber is used to illuminate autostereoscopic display apparatus as linear photophore
The pixel column of interior display board.In some embodiments, linear photophore is made up of simple optical fiber, and the simple optical fiber is with snake
Shape mode is arranged on substrate, to form linear photophore array.In some embodiments, linear photophore is by multifiber
Constitute.
Term " flexible light diffusion waveguide " refers to the flexible optical waveguide using nano-scale structure(Such as optical fiber), its
For making light diffusion go out the side of optical fiber or light diffusion being gone out to the side of optical fiber, so that light is exported the core of waveguide and passed through
The outer surface of waveguide, to provide illumination.Flexible light diffusion waveguide such as US Pat Appl Ser the 12/950,045th(The U.S. is special
Sharp application publication number 2011/0122646A1)Disclosed, its full text is incorporated herein by reference.
Term " waveguide section " may refer to single linear light diffusion waveguide, or positioned at identical flexible light diffusion waveguide
The flexible light diffusion waveguide of linear segment between bent portion or section.For example, single flexible light diffusion waveguide can be caused
Repeated flex 180 degree, to provide a series of parallel waveguide section, the waveguide tune is mutually disposed adjacent, and is generally existed
Arranged in plane.
Term " light source " refers to laser, light emitting diode or can launch the other assemblies of electromagnetic radiation, the electricity
Magnetic radiation is that visible wavelength range either can interact to occur the light of visible wavelength range with illuminator.
Statement " the luminous color of control " refers to changing over time the dynamic control of control emission wavelength according to demand
System, or glow color is predetermined passive control, such as by selecting specific illuminator and/or light source.
Term " illuminator " refers to showing luminous atom or compound, including various fluorogens and phosphor.
For point the direction in the accompanying drawings and convenient description the need for, used such as " level ", " vertical ", " preceding ",
Words such as " rear " and cartesian coordinate, but its purpose is not strictly to limit them in specification or claims
In absolute orientation and/or direction.
Following term and word are used for the light diffusion optical fiber with nano-scale structure.
" refractive index distribution curve " is refractive index or relative index of refraction and waveguide(Optical fiber)Relation between radius.
" relative index percent " is defined as
Δ(r)%=100x[n(r)2–nReference 2)]/2n(r)2,
Wherein, unless otherwise indicated, n (r) is the refractive index at radius r.Unless otherwise indicated, relative index of refraction percentage
Number is limited at 850nm.In one aspect, reference refractive index nReferenceIt is refractive index of the silica glass at 850nm
1.452498, on the other hand, it is the largest refractive index for coating glass at 850nm.Unless otherwise stated, herein
Relative index of refraction used represents that its value is with " % " for unit with Δ.Refractive index in a region is less than reference refractive index nReference
In the case of, relative index percent is negative, referred to as with sunk area or concave reflectivity optial, and unless otherwise saying
Bright, otherwise, minimum relative refractive index is obtained in relative index of refraction for the point calculating of negative peak.Refractive index in a region is big
In reference refractive index nReferenceIn the case of, relative index percent is positive number, and the region can be described as projection or with positive refraction
Rate.
Herein, " positive dopant (updopant) " be considered as tend to improve relative to undoped with pure SiO2Refraction
The dopant of rate.Herein, " negative dopant (downdopant) " be considered as tend to reduction relative to undoped with pure SiO2
Refractive index dopant.Positive dopant may be present in optical fiber the region with negative relative index of refraction, while with one kind
Or it is a variety of be not positive dopant other dopants.Similarly, one or more are not that other dopants of positive dopant can be deposited
It is that there is the region of positive relative index of refraction in optical fiber.Negative dopant, which may be present in, has positive relative index of refraction in optical fiber
Region, while not being other dopants of negative dopant with one or more.
Similarly, one or more is not that other dopants for bearing dopant may be present in optical fiber with negative relative folding
Penetrate the region of rate.
Term " α distributions " or " Alpha's distribution " refer to relative index of refraction distribution curve, are represented with Δ (r), and unit is
" % ", wherein r are radius, and the parameter is represented with below equation,
Δ(r)=Δ(ro)(1-[|r-ro|/(r1-ro)]α),
R in formulaoRepresent the point that Δ (r) is maximum, r1The point that Δ (r) % is zero is represented, r scope is ri<r<rf, wherein
Δ as hereinbefore defined, riIt is the starting point of α-distribution curve, rfIt is the terminal of α-distribution curve, α is index, is real number.
Therefore, term " parabola " used herein includes the substantially parabolically refractive index distribution curve of shape, it
Can be slightly offset from the situation that α values are 2.0 on one or more of fibre core point;" parabola " also include a small amount of change and/or
The distribution curve that center line sinks.In some illustrative embodiments, the α measured at 850nm is more than 1.5 and is less than 2.5,
More preferably greater than 1.7 and less than 2.3, even more preferably between 1.8-2.3.In other embodiments, index distribution is bent
One or more snippets on line is with the index shape for being substantially in ladder, wherein the α values measured at 850nm are more than 8, it is more excellent
Choosing is more than 10, even more preferably greater than 20.
Term " nanostructured fiber region ", which describes optical fiber, has such region or interval, the i.e. region or interval tool
Have substantial amounts of(More than 50)Hole in aeration porosity or other nano-scale structures, such as cross section of optic fibre more than 50,
More than 100 or more than 200.Aeration porosity can include such as SO2、Kr、Ar、CO2、N2、O2Or its mixture.This paper institutes
The nano-scale structure stated(Such as hole)Cross sectional dimensions(Such as diameter)It can change between 10nm to 1 microns(For example
50-500nm), length can be at 1 millimeter to change between 50m(Such as 2mm to 5m, or 5mm to 1m scope).
Referring now to Figure 1A, it is shown that according to the autostereoscopic display apparatus 100 of an embodiment of the invention.It should be noted that
, the component of autostereoscopic display apparatus 100 is not necessarily to scale, and actual embodiment can be more than or less than
Autostereoscopic display apparatus 100 shown in Figure 1A(Or with different geometrical constructions).Autostereoscopic display apparatus 100 is usual
Including lighting apparatus 110 and display board 130.Display board 130 can be configured to shows skill using the one or more of back-illumination source
Art, such as liquid crystal display(LCD).Display board 130 generally includes the array of single pixel 132.It is unrestricted as an example, often
Individual pixel may include RED sector, green portion and blue portion, and they individually can be addressed, to control the face of pixel
Color.
According to an embodiment, lighting apparatus 110 generally includes the optical fiber 114 being connected with substrate 112.In a replacement
In embodiment, optical fiber 114 is not connected with substrate.As detailed below, optical fiber 114 is configured to send out from its fibre core along its length
Light, so that it has played linear photophore.
The optical fiber 114 of embodiment as shown in Figure 1A is arranged on substrate 112 with serpentine fashion so that optical fiber 114
The linear photophore of the formation lighting apparatus 110 of straight line portion 115.Although shown optical fiber 114 has vertically disposed line part
Divide 115, but the implementation of the present invention is not limited to this.For example, can be arranged such that optical fiber 114 so that straight line portion is relative
In vertical angled.In addition, N number of while the display system in the visual field for producing, it can be seen that the pitch that linear photophore is placed
N times of display board pixel pitch should be approximately equal to.It is unrestricted as an example, for display 9 while the 1080p in the visual field is shown
Device, it may be desirable to about 213 linear photophores(1920/9).
Optical fiber 114 can be connected in first end with light source 120.Light source 120 can be launched with visible spectrum wavelength
Radiation any light source so that optical fiber 114 is equably lighted with luminous power along its length from its fibre core, the luminous power
Each pixel column of display board 130 is illuminated completely, to produce the various visuals field.Exemplary light source 120 may include, but be not limited to,
Laser and LED.Lighting apparatus 110 may also include terminal installation 122.In some embodiments, the terminal installation 122 is anti-
Penetrate so that the light of the end of optical fiber 114 reflects back into light source 120 by optical fiber 114.In other embodiments, terminal installation
122 be to absorb, so as to absorb the light for reaching the end of optical fiber 114.
As figs. 1A and 1 c show, optical fiber 114 is connected with substrate 112, so that it has straight line portion(For example, 115a,
115b), top curved part 117a and lower curved portion 117b.Top and bottom bent portion 117a, 117b radius can
Depending on the pixel pitch and overall dimension of the display board to be illuminated.In some embodiments, top curved part and bottom
Bent portion be by(For example, plate or opaque coating)Covering so that light is not transmitted into display board 130 from bent portion.
In other embodiments, light is launched from top and bottom bent portion.
Referring specifically to Figure 1A, it is noted that the embodiment of autostereoscopic display apparatus 100 can also be in lighting apparatus
Include extra optical module between 110 and display board 130.For example, can place double in the light path after lighting apparatus 110
Face convex lens component (lenticular lens assembly)(It is not shown)And/or diffusing globe(It is not shown), by optical fiber 114
The light sent is focused in the pixel 132 of display board 130, and the angle of the light of the transmitting of optical fiber 114 is broadened.
Fig. 1 C are the schematic top plan views of the straight line portion of optical fiber 114, and the straight line portion of the optical fiber 114 passes through pixel respectively
132a, 132b, 132c, 132d launch light cone La, Lb, Lc, Ld to observer O.It should be understood that Fig. 1 C only show a part
Autostereoscopic display apparatus, and many other linear photophores and pixel can be provided.Optical fiber 114 is configured to along its length
It is luminous, so as to receive back illumination to by the related pixel of the specific linear photophore of the straight line portion restriction of optical fiber 114.Such as Fig. 1 C
Shown, light cone Lb is by pixel 132b, and light cone Lc is by pixel 132c, by that analogy.It should be noted that the light meeting of fibre optical transmission
Pixel is illuminated, the pixel constitutes the pixel column for the page for entering Fig. 1 C.Observer O is spaced with autostereoscopic display apparatus 100
Specific distance(Such as 3 meters).The distance measured between observer's eyes is approximately equal to by the spacing of the adjacent light cone of pixel.
In embodiment shown in Fig. 1 C, the right eye e of observerrPixel 132b, the left eye e of observer are observed by light cone LblPass through light
Bore Lc observation pixels 132c.
Referring now to Fig. 1 D, it is shown that the partial cross sectional view of lighting apparatus 110.Shown lighting apparatus 110 includes substrate
112, multiple straight line portion 115a, 115b, 115c of optical fiber 114 as described above, and transparency carrier 119.Substrate 112 can be wrapped
Include multiple groove 113a, 113b, 113c(For example, v-depression, U-shaped groove etc.), optical fiber 114 is placed in one.In other implementations
In mode, optical fiber 114 can be placed on and do not had on reeded substrate 112.Transparency carrier can be by following material manufacture, the material
The wavelength for the light launched for optical fiber 114 is transmission(For example, glass material or plastic material).In some embodiments
In, lighting apparatus 110 may also include since substrate 112, the dividing plate extended between groove 113a, 113b, 113c(Do not show
Go out).The dividing plate can help to be formed the light cone of restriction, which reduce the amount of crosstalk seen by observer.
Autostereoscopic display apparatus can show multiple visuals field, so as to show multiple perspective scenes.In order to show N number of simultaneously
The visual field, places the pitch of linear photophore and needs to be approximately equal to pixel pitch and be multiplied by N.That is, in autostereoscopic display apparatus
In, the quantity of the straight line portion of lighting apparatus can be approximately equal to along the pixel of the width of pel array quantity divided by while regard
Wild N quantity.In at least some embodiments, the light of light source transmitting produces light cone Li by adjacent pixel 132i, described
Light cone Li spacing is approximately equal to(Within ± 20%, within more preferably ± 10%)Observer's eyes er、elMiddle spacing(For example join
See Fig. 1 C), ordinarily be about 70-90mm.
Fig. 2 shows such embodiment, wherein linear photophore is not as described above by single snakelike optical fiber institute
Limit, but many single optical fiber(For example, optical fiber 114a ', 114b ' and 114c ', are referred to as " 114 ' ").The number of optical fiber 114 '
Amount may depend on the quantity of required linear photophore.For example, in 1080p display devices, can there is about 213 optical fiber 114 '
It is used as linear photophore.Light source 120 ' can be placed along the length of substrate 112 so that simple optical fiber 114 ' connects with the light of light source 120 '
Connect.Optical fiber 114 ' can be terminated by the terminal installation 122 ' positioned at the opposite end of substrate 112.Terminal installation 122 ' can reflect
Light absorbs light, as described above.In some embodiments, simple optical fiber can limit two or more and linearly light
Device.For example, simple optical fiber can have a bent portion, so which defines two linear photophores.
Some embodiments can reduce the display board of illumination autostereoscopic display apparatus completely by using prism apparatus
The quantity and/or length of required optical fiber.Fig. 3 A show such a embodiment, and wherein prism apparatus 140 is located at optical fiber 114
In the light path of the light of transmitting.It should be understood that for the ease of diagram, one being only show in figure 3 a and is limited by optical fiber 114
Linear photophore.Prism apparatus 140 can produce the first optical fiber image 114 of optical fiber 114I1With the second optical imagery 114I2, so that
Produce the impression in the presence of 3 linear photophores rather than 1 linear photophore(In figure 3 a, optical fiber 114 is only physical light
It is fine).Therefore the pitch of linear photophore can be reduced using prism apparatus 140, the linear of requirement is produced so as to reduce
The length of optical fiber needed for photophore and/or the quantity of optical fiber.Image in view of generating one or more optical fiber 114, can
It is adjusted with the brightness for the light launched optical fiber 114.Moreover, it will be understood that prism apparatus 140 can be configured to generation incessantly
The image of two optical fiber 114.
Fig. 3 B show a part of prism apparatus 140 according to an embodiment.In one embodiment, prism is filled
Put 140 and can be configured to the angle filter membrane (angular filter film) for defining multiple prisms thereon.Shown in Fig. 3 B
In embodiment, the prism apparatus 140 for the just optical transmission launched for optical fiber 140 has several microprism features, and it is produced
The image of the optical fiber shown in Fig. 3 A is given birth to.In one embodiment, microprism feature is about 50 microns.Exemplary prism device
140 have the flatter part 141 that will not make it that light deviates, with positive direction(For example ,+θ)So that the first angle portion that light deviates
Divide 142, and with negative direction(For example ,-θ)So that the second angle part 143 that light deviates.Flatter part, first angle portion
Divide and the style of second angle part is repeated along prism apparatus.It is saturating with 3 different angles by the light of prism apparatus 140
Penetrate, so as to produce the multiple images of optical fiber 114.
The angle of first and second angle parts 142,143 can be unequal.In addition, according to other embodiment
Prism assemblies can have more than 3 different angle parts, and/or without flatter part.
The various embodiments of the optical fiber of lighting apparatus are described below.Unrestricted as an example, light leak fibre may be configured to
It is as entitled " using multi wave length illuminating source (the Multi-Wavelength Light of light diffusion optical fiber in what is submitted on October 11st, 2011
Source Using Light Diffusing Fibers) " U.S. Patent Application No. 61/545,713 described in flexible light
Waveguide is diffused, its full text is incorporated herein by reference.It should be noted that optical fiber described above there can be any configuration, make
They are from its fibre core and launch light along its length, to be used as linear photophore.
Fig. 4 is the surface schematic diagram of the illustrative embodiments of light diffusion optical fiber, has central shaft at this(" center
Line ")16 light diffusion optical fiber(Hereinafter referred to as " optical fiber ")There are many holes in 12 fibre core.Fig. 5 is light diffusion optical fiber shown in Fig. 4
114 along direction 2-2 observe when cross-sectional view.Light diffusion optical fiber 114 can be for example, all kinds of have nanostructured optical fiber
Any one of the optical fiber in area optical fiber, the nanostructured fiber region has periodically or non-periodically nano-scale structure 32
(Such as hole).In an illustrative embodiments, optical fiber 114 includes the fibre core 20 for being divided into three parts or region.These
Core area is:Solid center portion 22, nanostructured annular section(Interior ring core area)26 and the outer reality around the interior ring core area 26
Body portion 28.Coat area 40(" cladding ")Around ring core 20 and with outer surface.Cladding 40 can have low-refraction, to provide height
Numerical aperture(NA).Coating 40 can be, the fluorinated acrylate of such as low refractive index polymer, such as UV-curable or heat cure
Or silicones.
In other illustrative embodiments being described below, coating 44 is designed to improve passes to cladding 40 from fibre core 20
" radiant light " distribution and/or property.The outer surface of cladding 40 or the outer surface of optional coating 44 represent optical fiber 114
" side " 48, as described herein, the light advanced in a fiber is by being diffused off the side.
Optionally, with protective cover or foreskin(It is not shown)Covering cladding 40.Optical fiber 114 can coat 40 comprising fluorination, if but
Optical fiber is used for the shorter application of length, when wherein leakage loss does not damage illumination properties, then the fluorination cladding is not needed.
In some illustrative embodiments, the core area 26 of light diffusion optical fiber 114 includes glass basis(" glass ")31, its
In have the nano-scale structure that many aperiodicity are set(Such as " hole ")32, as amplification illustration is displayed the details of in Fig. 5
Exemplary hole.In another illustrative embodiments, hole 32 can periodically be set, and such as be arranged on photonic crystal fiber
In, the representative diameter of its mesopore is in about 1x10-6To 1x10-5Between m.Hole 32 aperiodicity or can be also randomly provided.One
In a little illustrative embodiments, the glass 31 in region 26 is fluorine doped silica, and in other embodiments, glass is not
The pure silicon dioxide of doping.Preferably, pore diameter is at least 10nm.
Nano-scale structure 32 makes outer surface diffusion of the light from fibre core 20 to optical fiber.Then, the light " diffusion " of diffusion passes through
The outer surface of optical fiber 114, to provide required illuminating effect.That is, most of light passes through optical fiber 114 along fiber lengths
Side diffusion(Via diffusion).
Glass in core area 22 and 28 can include positive dopant, such as Ge, Al and/or P." aperiodicity setting " or " non-week
Phase property is distributed " refer to when taking cross section of optic fibre(For example it is as shown in Figure 5), hole 32 randomly or non-periodically is distributed in optical fiber
A part in.Difference takes similar cross section to disclose different cross-sectional hole patterns on along fiber lengths, also
It is to say, each cross section has different pattern of apertures, and the size of the distribution of hole and hole is mismatched.That is, described
Hole is acyclic, i.e., these holes are not to set in a periodic fashion in optical fiber structure.These holes are along optical fiber
Length(I.e. parallel to the longitudinal axis)Elongate(Elongation), but for the conventional length of Transmission Fibers, will not be in whole optical fiber
Whole length on extend.While not wishing to be bound by theory, it is believed that hole development length is less than 10m, in many feelings
Under condition, 1m is extended less than along fiber lengths.
In the present invention, the light diffusion optical fiber 114 used in the illuminator being discussed below can be by using prefabricated component
Prepared by the method for consolidation condition, the condition makes the gas of significant quantity be trapped in consolidated frit base, so that in consolidated frit light
Hole is formed in fine prefabricated component.It is not that these holes are removed using some steps, but it is formed using the prefabricated component of gained
In the optical fiber comprising hole or nano-scale structure.Using the nano-scale structure or hole of gained optical fiber, along fiber lengths,
Light diffusion is set to go out optical fiber or by light-output optical fiber through its side.That is, by fiber outer surface by light-output fibre core 20, with
Illuminating effect needed for providing.
As used herein, the diameter of nano-scale structure such as hole is from light from the vertical cross-section for crossing the optical fiber longitudinal axis
When fine, its end points is located at nose section contained in the nano-scale structure on the border of nano-scale structure.For example, United States Patent (USP)
Apply for sequence the 11/583098th(U.S. Patent Application Publication No. 2007/0104437A1)Describing manufacture has nano-scale
The method of the optical fiber of hole, it is incorporated herein by reference.
As described above, in some embodiments of optical fiber 114, core segment 22 and 28 includes germanium-doped silica, i.e.,
The silica of Germania-doped.In the core of optical fiber, particularly centerline or its near, can be used alone or in combination germanium with
Outer dopant, to obtain required refractive index and density.In at least some embodiments, optical fiber as disclosed herein is in fibre
Relative index of refraction distribution in core segment 22 and 28 is not negative.These dopants can be, such as Al, Ti, P, Ge or its group
Close.In at least some embodiments, optical fiber is in core without the dopant for reducing refractive index.In some embodiments, originally
Relative index of refraction distribution of the optical fiber in core segment 22,24 and 28 disclosed in text is not negative.
In some examples of optical fiber 114 used herein, fibre core 20 is the fibre core with graded index, preferably
It is that the refractive index distribution curve of fibre core has parabola(Or substantially parabolically)Shape;For example, in some embodiment party
In formula, the refractive index distribution curve of fibre core 20 has α shapes, and the α values measured at 850nm are about 2, preferably 1.8-2.3.At it
In his embodiment, on refractive index distribution curve one or more snippets have substantially be in ladder index shape, wherein
The α values measured at 850nm are more than 8, more preferably greater than 10, even more preferably greater than 20.In some embodiments, the folding of fibre core
The largest refractive index and center line of the largest refractive index of the characteristics of rate of penetrating can sink with center line, wherein fibre core and whole optical fiber
16 are separated by small distance, but in other embodiments, the characteristics of refractive index of fibre core does not have center line sinking, the maximum of fibre core
The largest refractive index of refractive index and whole optical fiber is located at centerline.
In an illustrative embodiments, optical fiber 114 has fibre core 20 and sunken refractive index based on silica(Phase
For silica)Polymer overmold 40.Low refractive index polymer cladding 40 preferably has negative relative index of refraction, more preferably
Less than -0.5%, even more preferably less than -1%.In some illustrative embodiments, the thickness of cladding 40 is micro- more than or equal to 20
Rice.In some illustrative embodiments, cladding 40 has the refractive index lower than fibre core, and its thickness is equal to or more than 10
Micron(For example equal to or more than 20 microns).In some illustrative embodiments, the overall diameter of cladding is RIt is maximumTwice, example
Such as it is about 125 microns(Such as 120-130 microns, or 123-128 microns).In other embodiments, the diameter of cladding is small
In 120 microns, such as 60 or 80 microns.In other embodiments, the overall diameter of cladding is micro- more than 300 more than 200 microns
Rice, or more than 500 microns.In some embodiments, length of the overall diameter of cladding along optical fiber 114 is constant.
In some embodiments, the refractive index of optical fiber 114 is radial symmetric.Preferably, the overall diameter 2R3 of fibre core 20 is along optical fiber
Length is constant.Preferably, length of the overall diameter of core segment 22,26,28 along optical fiber is also constant.Described in us
" constant " refer to diameter relative to average value change be less than 10%, preferably smaller than 5%, more preferably less than 2%.Fig. 6 A are Fig. 5 institutes
The exemplary relative index of refraction Δ for the example fiber 114 shown and fiber radius curve map(Solid line).Fibre core 20 can also have gradually
Become fibre core distribution curve, i.e. α distribution curves, such as α values are between 1.8-2.3(Such as 1.8-2.1).
Fig. 6 A are the exemplary relative index of refraction Δ of the example fiber 114 shown in Fig. 5 and the curve map of fiber radius(It is real
Line).Fibre core 20 can also have gradual change fibre core distribution curve, it is characterized in that, such as α values are between 1.7-2.3(Such as 1.8-
2.3).Dotted line shows optional exemplary refractive index distribution curve.It is outer partly that core area 22 radially extends out to it from center line
Footpath R1, with relative index of refraction distribution curve Δ1(r), corresponding to largest refractive index n1(And relative index percent
Δ1 is maximum).In this embodiment, reference refractive index nReferenceIt is the refractive index at cladding.Second core area(Nanostructured area)26 tools
There is minimum refractive index n2, relative index of refraction distribution curve Δ2(r), maximum relative refractive index Δ2 is maximumAnd minimum relative refractive index
Δ2 is minimum, wherein, in some embodiments, Δ2 is maximum=Δ2 is minimum.3rd core area 28 has largest refractive index n3, relative index of refraction
Distribution curve Δ3(r), the relative index of refraction distribution curve Δ3(r) there is maximum relative refractive index Δ3 is maximumWith minimum relative
Rate Δ3 is minimum, in some embodiments, Δ 3It is maximum=Δ3It is minimum.In this embodiment, annular cladding 40 has refractive index n4, phase
Refractive index distribution curve Δ4(r), the relative index of refraction distribution curve Δ4(r) there is maximum relative refractive index Δ4 is maximumAnd minimum
Relative index of refraction Δ4 is minimum.In some embodiments, Δ4 is maximum=Δ4 is minimum.In some embodiments, Δ1 is maximum>Δ4 is maximumAnd
Δ3 is maximum>Δ4 is maximum.In some embodiments, Δ2 is minimum>Δ4 is maximum.In embodiment as shown in figs. 5 and 6, Δ1 is maximum>
Δ3 is maximum>Δ2 is maximum>Δ4 is maximum.In this embodiment, the refractive index in these regions has following relation:n1>n3>n2>n4。
In some embodiments, core region 22,28 has substantially invariable index distribution, as shown in Figure 6A, constant
Δ1And Δ (r)3(r).In some such embodiments, Δ2(r) slightly just(0<Δ2(r)<0.1%), slightly bear(-0.1%
<Δ2(r)<0)Or be 0%.In some embodiments, Δ2(r) absolute value is less than 0.1%, preferably smaller than 0.05%.One
In a little embodiments, outer cladding area 40 has substantially invariable index distribution, as shown in Figure 6A, constant Δ4(r).One
In a little such embodiments, Δ4(r)=0%.The refractive index of core segment 221(r)≥0%.In some embodiments, fill
The region 26 of hole has relative index of refraction distribution curve Δ2(r), it has negative relative index of refraction, and absolute value is less than
0.05%, and the Δ in core area 283(r) can be for example on the occasion of or zero.In at least some embodiments, n1>n2And n3>n4。
In some embodiments, the refractive index of cladding 40 is -0.05%<Δ4(r)<0.05%.In other embodiment
In, cladding 40 and core segment 20,26 and 28 can include it is pure(Undoped with)Silica.
In some embodiments, cladding 40 includes silica that is pure or mixing F.In some embodiments, coat
40 include pure low refractive index polymer.In some embodiments, nanostructured area 26 includes pure silicon dioxide, wherein including
Multiple holes 32.Preferably, it is contemplated that the presence of any hole, the minimum relative refractive index and average effective in nanostructured area 26
Relative index of refraction is respectively less than -0.1%.Hole 32 can comprising one or more gases, for example argon gas, nitrogen, oxygen, Krypton or
SO2, or the vacuum that there is no gas can be included.But, in spite of existing in any gas, nanostructured area 26
Mean refractive index is reduced because of the presence of hole 32.Hole 32 can randomly or non-periodically be arranged in nanostructured area 26,
In other embodiments, hole is periodically set at wherein.
In some embodiments, the hole and multiple periodicity that multiple holes 32 are set comprising multiple aperiodicity are set
Hole.
In the exemplary embodiment, core segment 22 includes the silica for being doped with germanium oxide, inner ring core region 28
Comprising pure silicon dioxide, cladding ring region 40 includes glass or low refractive index polymer.In some such embodiments, nanometer
Structural area 26 includes multiple holes 32 in pure silicon dioxide;And in other such embodiments, nanostructured area 26 is mixing
Multiple holes 32 are included in fluorodioxy SiClx.
In some embodiments, the outer radius Rc of fibre core is more than 10 microns and less than 600 microns.In some embodiments
In, the outer radius Rc of fibre core is more than 30 microns and/or less than 400 microns.For example, Rc can be 125-300 microns.In other realities
Apply in mode, the outer radius Rc of fibre core 20(It note that in the embodiment shown in Fig. 6 A, Rc=R3)It is more than 50 microns and small
In 250 microns.The radius of the core 22 of fibre core 20 is 0.1Rc≤R1≤ 0.9Rc, preferably 0.5Rc≤R1≤09Rc。
The width W2 of nanostructured ring region 26 is preferably 0.05Rc≤W2≤0.9Rc, preferably 0.1Rc≤W2≤0.9Rc, in some realities
Apply in mode is 0.5Rc≤W2≤0.9Rc(In the case of the density identical of nano-scale structure, nanostructured area is wider, overflows
The decay for penetrating induction is bigger).Width Ws=the W3 in solid glass core area 28 so that 0.1Rc>W3>0.9Rc.Each portion of fibre core 20
Divide and all include the glass based on silica.The radial width W in nanostructured area 262Preferably greater than 1 micron.For example, W2Can be
5-300 microns, preferably equal to or smaller than 200 microns.In some embodiments, W2More than 2 microns and less than 100 microns.
In other embodiment, W2More than 2 microns and less than 50 microns.In other embodiments, W2It is more than 2 microns and micro- less than 20
Rice.In some embodiments, W2At least 7 microns.In other embodiments, W2More than 2 microns and less than 12 microns.Core
The width W in area 283It is (R3-R2), its midpoint R3 midpointsIt is (R3+R2)/2.In some embodiments, W3It is more than 1 micron and small
In 100 microns.
The numerical aperture of optical fiber 114(NA)Preferably equal to or greater than import light into the NA of the light source of optical fiber.Preferably, optical fiber
114 numerical aperture(NA)More than 0.2, in some embodiments more than 0.3, even more preferably greater than 0.4.
In some embodiments, the core outer radius R1 in the first core area 22 is preferably not less than 24 microns and no more than 50 is micro-
Rice, i.e., core diameter is between about 48-100 microns.In other embodiments, 24 microns of R1 >;In other embodiments
In, 30 microns of R1 >;In other embodiment, 40 microns of R1 >.
In some embodiments, inner annular part 26 is in the radial width more than 50% | Δ2(r)|<0.025%;
In other embodiments, region 26 is in the radial width more than 50% | Δ2(r)|<0.01%.Sunken refractive index annulus
Divide 26 since the relative index of refraction of cladding is less than at -0.05% value at first, radially stretch out from center line.
In some embodiments, cladding 40 has relative index of refraction distribution curve Δ4(r), its maximum value be less than 0.1%, and
Δ in this embodiment4 is maximum<0.05% and Δ4 is minimum>- 0.05%, and sunken refractive index annulus 26 terminates at outmost hole
The position of appearance.
Clad structure 40 extends to radius R4, and it is also the outmost circumference of optical fiber.In some embodiments, cladding
Width R4-R3 is more than 20 microns;In other embodiments, R4-R3 is at least 50 microns;In some embodiments, R4-R3
At least 70 microns.
In another embodiment, whole fibre core 20 is all nano-structured(For example it is filled with hole), and coat 40
Fibre core 20 is surrounded.Fibre core 20 has " staged " refractive index, or can have gradual change fibre core distribution curve, i.e. α distributions are bent
Line, such as α values are between 1.8-2.3.
Fig. 6 B show the schematic diagram of the another exemplary embodiment of light diffusion optical fiber 114.Fig. 6 B optical fiber includes tool
There is relative index of refraction Δ1Fibre core 20, on fibre core 20 and surround the nanostructured area 26 ' of fibre core 20.Fibre core 20 can have
There is " staged " index distribution, or can have gradual change fibre core distribution curve, i.e. α distribution curves, such as α values are in 1.8-2.3
Between.
In this exemplary embodiment(See Fig. 6 B), nanostructured area 26 ' is the annulus with multiple holes 32.Herein
In embodiment, the width in region 26 ' can be as small as 1-2 microns, and can have negative average relative refractive index Δ2.Cladding 40
Surround nanostructured area 26 '.Cladding 40(Radially)Width can be as small as 1 micron, and the relative index of refraction coated can be negative
, it is positive or 0%(Relative to pure silicon dioxide).The main distinction between example shown in Fig. 6 A and 6B is, receiving shown in Fig. 6 A
Rice structural area is located in the fibre core 20 of light diffusion optical fiber 114, and in fig. 6b, it is located at fibre core/cladding interface.Sunken refraction
Rate annulus 26 ' since the relative index of refraction of fibre core is less than at -0.05% value at first, radially from center line to
Outer extension.In the embodiment shown in Fig. 6 B, cladding 40 has relative refractive index profile Δ3(r), its maximum value is less than
0.1%;And in this embodiment, Δ3 is maximum<0.05% and Δ3 is minimum>- 0.05%, sunken refractive index annulus 26, which is terminated at, to be filled out
Fill in the region of hole and occurred at outmost hole.
In the embodiment shown in Fig. 6 B, the refractive index of fibre core 20 is more than the refractive index n of ring region 26 '2, and coat 40
Refractive index n1Also greater than refractive index n2。
Fig. 6 C show the fibre core 20 of an embodiment of the optical fiber 114 being made.This optical fiber has outer radius R1
About 33.4 microns of the first core area 22, the nanostructured area 26 of outer radius R2=42.8 micron, outer radius R3=62.5 micron
3rd core area 28 and outer radius R4(It is not shown)For 82.5 microns of polymer overmold 40.In this embodiment, core material
It is pure silicon dioxide(Undoped with silica), the material for cladding is low refractive index polymer(For example, refractive index is
The silicones of 1.413 UV-curable, can be purchased from the Dow Corning Corporation in available city with trade name Q3-6696
(Dow-Corning, Midland, Michigan)), the polymer make together with glass core optical fiber NA be 0.3.Compared to
Standard single mode transmits optical fiber, such as SMF-28eROptical fiber, optical fiber 114 has flatter to wavelength(It is weak)Dependence.In standard
Single mode(Such as SMF-28eR)Or in multimode fibre, the loss at the wavelength less than 1300nm depends primarily on Rayleigh diffusion.
The diffusion loss of these Rayleighs is determined by the property of material, to visible wavelength(400-700nm)It ordinarily be about 20dB/km.Rayleigh
Dependence and λ of the diffusion loss to wavelength-pIt is directly proportional, p ≈ 4.In the optical fiber comprising at least one nanostructured area, in 400-
At least 80% in 1100nm wave-length coverages(It is greater than 90%)Wavelength on, dependent on wavelength diffusion loss index be less than 2,
Preferably smaller than 1.It is about 0.4dB/m that 400-1100nm averaged spectrum, which decays in the fibres drawn at tensions optical fiber with 40g,;With 90g
Fibres drawn at tensions optical fiber 114 when be about 0.1dB/m.In this embodiment, nano-scale structure includes SO2Gas.Nano junction
SO is filled in structure ring2Hole be greatly promoted diffusion.SO is used in addition, working as2During gas formation nanostructured, this gas is found
Thermal reversion loss, i.e., nano-structured optical fiber diffused light when less than 600 DEG C are realized, and same optical fiber will be right during higher than 600 DEG C
Light plays guide function.SO2This peculiar property assigned is also reversible, that is to say, that same optical fiber is cool below into 600
DEG C when, optical fiber 114 will play light diffusion optical fiber, and produce observable diffusion effect again.
In a preferred embodiment, by controlling optical fiber pulling force in drawing process;Or drawn by the way that selection is suitable
Pulling force processed(For example between 30-100g, or between 40-90g), the illumination uniformity along fiber lengths is controlled, so that
So that minimum diffusion illumination intensity is not less than the 0.7 of maximum diffusion illumination intensity.
In order to describe and limit embodiments of the present invention, it is noted that term " substantially " can be recognized for expression
To be the intrinsic uncertainty caused by any quantitative comparison, numerical value, measurement or other representations.
It should be noted that the part " being configured to " in particular implementation as described herein into specific mode or by
" being configured to " or " being configured to " has specific character or in a particular manner function, is structural description, rather than
Expected purposes is limited.More particularly, herein when describing the mode of " configuration " or " construction " of part, representing should
The existing physical condition of part, therefore can be regarded as the limited description of the architectural feature of the part.
It should also be noted that when with term " at least one " description specific components or element, not implying that and using term
" one ", which describes to eliminate when other assemblies or element, uses more than specific a component or element.More particularly, although
Component may be described with " one ", but it is only one that this, which is not construed as limiter assembly,.
Although specific embodiment has been shown and described herein, it should be understood that can carry out it is various its
He changes or improved, without departing from the spirit and scope of destination object claimed.More particularly, although of the invention
Some aspects be considered herein as it is preferred or it is particularly advantageous that it is contemplated that to mesh claimed of the invention
Mark object is not necessarily limited to these aspects.
Claims (14)
1. a kind of lighting apparatus for autostereoscopic display apparatus, the lighting apparatus includes:
Including positive substrate;
Optical fiber on the substrate is set, the optical fiber is defined multiple straight line portions, the optical fiber include first end and
Fibre core, wherein the optical fiber is from its side radial direction diffused light so that light is directed to the fibre core for leaving optical fiber, and the line part
Divide and played linear photophore;
Prism apparatus in the light path of the optical fiber, the prism apparatus generates the image of two or more optical fiber;
And
With the light source of the first end light connects of the optical fiber, the light source is lighted with one or more required wavelength.
2. a kind of autostereoscopic display apparatus, it includes:
(i) lighting apparatus as claimed in claim 1;And
(ii) display board of pel array is included, wherein, the straight line portion has played the linear hair for launching light to the display board
The effect of light device.
3. lighting apparatus as claimed in claim 1 or autostereoscopic display apparatus as claimed in claim 2, its feature exist
In the optical fiber is arranged on substrate so that the single straight line portion of the multiple straight line portion is by the bent portion of optical fiber point
Open.
4. lighting apparatus as claimed in claim 1 or autostereoscopic display apparatus as claimed in claim 2, its feature exist
In the quantity of the straight line portion of the lighting apparatus is approximately equal to the pixel of the width along the display board of autostereoscopic display apparatus
Quantity divided by visual field N quantity simultaneously.
5. lighting apparatus as claimed in claim 1 or autostereoscopic display apparatus as claimed in claim 2, its feature exist
In the front of the substrate includes multiple grooves, and multiple straight line portions of the optical fiber are located in the multiple groove.
6. lighting apparatus as claimed in claim 1 or autostereoscopic display apparatus as claimed in claim 2, the illumination
Equipment or the autostereoscopic display apparatus also include be located at the optical fiber on transparency carrier so that optical fiber be located at substrate and
Between transparency carrier.
7. lighting apparatus as claimed in claim 1 or autostereoscopic display apparatus as claimed in claim 2, the illumination
Equipment or the autostereoscopic display apparatus also include the second optical fiber being arranged on substrate, define second optical fiber
Multiple straight line portions, the straight line portion has played linear photophore.
8. lighting apparatus as claimed in claim 1 or autostereoscopic display apparatus as claimed in claim 2, its feature exist
In the prism apparatus includes flatter part and angle part.
9. lighting apparatus as claimed in claim 1 or autostereoscopic display apparatus as claimed in claim 2, its feature exist
In the prism apparatus includes angle filter membrane.
10. lighting apparatus as claimed in claim 1 or autostereoscopic display apparatus as claimed in claim 2, the photograph
Bright equipment or the autostereoscopic display apparatus also include the terminal installation being connected with the second end of optical fiber.
11. lighting apparatus as claimed in claim 1 or autostereoscopic display apparatus as claimed in claim 2, its feature
It is,
The fibre core of the optical fiber includes:
The region with multiple nano-scale structures in the fibre core, it is configured to by the multiple nano-scale structure
The light being directed to is diffused away through outer surface;And
Solid glass area, it is around the region with multiple nano-scale structures, the refractive index in the solid glass area
More than the refractive index in the region with multiple nano-scale structures;And
The optical fiber also includes coating around the low-refraction of the fibre core, and the refractive index of the cladding is less than solid glass
The refractive index in area.
12. lighting apparatus as claimed in claim 1 or autostereoscopic display apparatus as claimed in claim 2, its feature
It is, the light source includes laser.
13. being used for the lighting apparatus of autostereoscopic display apparatus as claimed in claim 1, it also includes:
Multifiber on the substrate is set, the simple optical fiber of the multifiber is defined at least one line part
Point, each simple optical fiber includes first end and fibre core, wherein each simple optical fiber is from its side radial direction diffused light so that light
The fibre core for leaving optical fiber is directed to, and the straight line portion of the multifiber has played linear photophore;And
The first end light connects of the light source and every optical fiber.
14. lighting apparatus as claimed in claim 13, it is characterised in that
The fibre core of each simple optical fiber includes:
The region with multiple nano-scale structures in the fibre core, it is configured to by the multiple nano-scale structure
The light being directed to is diffused away through outer surface;And
Solid glass area, it is around the region with multiple nano-scale structures, the refractive index in the solid glass area
More than the refractive index in the region with multiple nano-scale structures;And
Each simple optical fiber also includes coating around the low-refraction of the fibre core, and the refractive index of the cladding is less than solid
The refractive index of glass region.
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US201161546303P | 2011-10-12 | 2011-10-12 | |
US61/546,303 | 2011-10-12 | ||
PCT/US2012/059416 WO2013055713A1 (en) | 2011-10-12 | 2012-10-10 | Autostereoscopic display illumination apparatuses and autostereoscopic display devices incorporating the same |
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WO2015006302A1 (en) * | 2013-07-11 | 2015-01-15 | Corning Incorporated | Lighting units having light-diffusing optical fiber |
US20170140709A1 (en) * | 2015-11-16 | 2017-05-18 | Changhong Research Labs, Inc. | Waveguide structure for laser display system |
CN110500553A (en) * | 2018-05-16 | 2019-11-26 | 深圳市绎立锐光科技开发有限公司 | Light supply apparatus and car headlamp |
CN114879411B (en) * | 2022-06-27 | 2023-10-20 | 深圳康佳电子科技有限公司 | Backlight module based on coreless optical fiber |
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- 2012-10-10 KR KR1020147008669A patent/KR102050072B1/en not_active Expired - Fee Related
- 2012-10-10 CN CN201280049709.XA patent/CN103858033B/en not_active Expired - Fee Related
- 2012-10-10 WO PCT/US2012/059416 patent/WO2013055713A1/en active Application Filing
- 2012-10-10 JP JP2014535796A patent/JP2015503177A/en active Pending
- 2012-10-10 EP EP12772697.4A patent/EP2766753A1/en not_active Withdrawn
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Also Published As
Publication number | Publication date |
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JP2015503177A (en) | 2015-01-29 |
KR20140076563A (en) | 2014-06-20 |
KR102050072B1 (en) | 2019-11-28 |
CN103858033A (en) | 2014-06-11 |
EP2766753A1 (en) | 2014-08-20 |
WO2013055713A1 (en) | 2013-04-18 |
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