WO2014187236A1 - Structure lumineuse basée sur un principe d'électroluminescence et dispositif d'affichage - Google Patents

Structure lumineuse basée sur un principe d'électroluminescence et dispositif d'affichage Download PDF

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Publication number
WO2014187236A1
WO2014187236A1 PCT/CN2014/076895 CN2014076895W WO2014187236A1 WO 2014187236 A1 WO2014187236 A1 WO 2014187236A1 CN 2014076895 W CN2014076895 W CN 2014076895W WO 2014187236 A1 WO2014187236 A1 WO 2014187236A1
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light
layer
emitting
filament
luminescent
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PCT/CN2014/076895
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English (en)
Chinese (zh)
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李尚霖
徐和平
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Li Shanglin
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Publication of WO2014187236A1 publication Critical patent/WO2014187236A1/fr

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/182—OLED comprising a fiber structure

Definitions

  • the invention belongs to a light-emitting structure or display device based on the principle of electroluminescence.
  • Chinese patent CN201010101273.7 provides a flexible matrix inorganic electroluminescent flat panel display comprising a transparent plastic base layer, a stacked lateral transparent conductive stripe layer, a luminescent layer, a dielectric layer, and a vertical layout which are sequentially arranged on a transparent plastic base layer.
  • the through electrode on the display is connected to the conductive stripe layer, and the back electrode is connected to the back electrode strip layer.
  • the electrodes, electroluminescent materials, various dielectric layers and auxiliary layer structures in the patent are directly prepared on a whole flat substrate (glass or plastic substrate), which is an overall structure, and the size of the display is directly dependent on the substrate size.
  • the large-area flat substrate processing has high requirements on equipment, environment and processing technology, and the processing technology is also very complicated, so there are disadvantages such as large screen difficulty, high equipment requirements, and high realization cost.
  • Electrodes, electroluminescent materials, various dielectric layers, and auxiliary layer structures are all in parallel stacked structures on a flat substrate.
  • the electric field concentration is poor, and the luminance and luminous efficiency are low.
  • each color light-emitting lattice structure needs to be performed on a flat substrate by using a mask evaporation or deposition, or a complicated processing process such as mask printing, mask exposure, mask etching, and the like.
  • the process precision is high and difficult, resulting in high equipment and production environment requirements, large investment, low yield and high cost.
  • the preparation of the light-emitting layer requires a paste printing or coating and sintering process, which is limited by the hot working temperature, and requires the use of a heat-resistant hard substrate (such as glass), which cannot be realized. Flexible, it is difficult to enlarge the screen.
  • the preparation of the light-emitting layer requires vacuum deposition or growth process, which requires high process environment and equipment, and has the disadvantages of large investment, low yield and high cost.
  • the electroluminescent material layer is a film.
  • the preparation of the luminescent layer requires vacuum deposition or growth process.
  • the organic luminescent material is very sensitive to water and oxygen, and the requirements for the permeability of the substrate material and the sealing technology are strict, which leads to The production process environment and processing equipment have high requirements, and have the disadvantages of large investment, low yield, and high cost.
  • the present invention provides a new structure of a light-emitting structure or a display device, which solves the above problems by using separate light-emitting line unit structures independent of each other.
  • a light-emitting structure based on the principle of electroluminescence which is characterized in that it comprises: a first supporting component and a light-emitting filament unit, wherein the first supporting component comprises a thin supporting substrate and a substrate functional unit, and the substrate functional unit comprises Preparing or coating at least one layer of scan electrodes and fixing components on the thin support substrate;
  • the light emitting filament unit is fixed on the first supporting component by a fixing component
  • the luminescent filament unit comprises an array of filaments formed by rewinding or arranging or weaving at least one luminescent filament.
  • the second support assembly includes a thin support substrate and a substrate function unit, and the substrate functional unit includes at least one scanning electrode and a fixing assembly sequentially prepared or coated on the thin support substrate;
  • the light emitting filament unit is fixed between the first support assembly and the second support assembly.
  • the above fixing member is at least one layer of bonding material prepared, coated on the scanning electrode, a layer of a low-melting heat sealing material, a riveting structure or a snap structure.
  • the above-mentioned light-emitting filament comprises a conductive filament serving as a data electrode, at least one light-emitting unit coated outside the conductive filament, and the light-emitting unit comprises a layer of a light-emitting material.
  • the light emitting unit further includes an auxiliary layer disposed on an inner side of the light emitting material layer.
  • the above-mentioned light-emitting filament unit further includes a functional layer, the functional layer being located at the luminescent material layer and the scan electrode Between
  • the functional layer is a secondary auxiliary layer, or a secondary auxiliary layer and a ring-shaped electrode unit, the secondary auxiliary layer is in full or partial contact with the luminescent material layer, and the material of the luminescent material layer is an inorganic luminescent material;
  • the ring-shaped electrode unit includes a plurality of ring-shaped electrodes wrapped around the outermost side of the light-emitting filaments, and the plurality of ring-shaped electrodes are electrically connected to the scan electrodes.
  • the light emitting filament unit further includes a functional layer, the functional layer being located between the luminescent material layer and the scan electrode;
  • the functional layer is a secondary auxiliary layer, or a secondary auxiliary layer and a ring-shaped electrode unit, the secondary auxiliary layer is in full or partial contact with the luminescent material layer, and the material of the luminescent material layer is an inorganic luminescent material;
  • the ring-shaped electrode unit includes a plurality of ring-shaped electrodes wrapped around the outermost side of the light-emitting filaments, and the ring-shaped electrodes are electrically connected to the scan electrodes.
  • the above auxiliary layer includes an electron injecting layer and an electron transporting layer, and the material of the luminescent material layer is an organic luminescent material.
  • the light emitting filament unit further includes a functional layer, the functional layer being located between the luminescent material layer and the scan electrode;
  • the functional layer is a secondary auxiliary layer, or a secondary auxiliary layer and a ring electrode unit;
  • the secondary auxiliary layer includes a hole transport layer and a hole injection layer, the hole transport layer being in contact with the luminescent material layer;
  • the ring-shaped electrode unit includes a plurality of ring-shaped electrodes wrapped around the outermost side of the light-emitting filaments, and the ring-shaped electrodes are electrically connected to the scan electrodes.
  • the conductive filament has a diameter or a longest diameter of 0.001 mm to 10 mm.
  • the thin supporting substrate is made of a thin glass, a thin metal plate or an organic material thin plate or a thin film, the film substrate has a thickness of 5 um to 20 mm, and the scanning electrode has a thickness of 1 nm to 200 um.
  • the material of the conductive filament and the scan electrode is a metal conductive material or a non-metal conductive material; the light-emitting filament has a circular, oblate, triangular, quadrangular, polygonal or semi-circular cross section.
  • the luminescent material layer has a thickness of from 1 nm to 5000 um, and the auxiliary layer has a thickness of from 1 nm to 5000 um.
  • the luminescent material layer has a thickness of from 1 nm to 500 um.
  • a display device prepared by a light-emitting structure based on an electroluminescence principle, comprising a data circuit, a control circuit, a scanning circuit and a light-emitting structure,
  • the light emitting structure includes a first support assembly including a thin support substrate and a substrate functional unit, and the substrate functional unit including at least one layer sequentially prepared or coated on the thin support substrate Scanning electrodes and fixing components;
  • the light emitting filament unit is fixed on the first supporting component by a fixing component
  • the illuminating filament unit comprises an array of filaments formed by rewinding or arranging or weaving at least one luminescent filament;
  • the data circuit is electrically coupled to the illumination filaments, the scan circuitry being electrically coupled to the scan electrodes, the control circuitry controlling the data circuitry and the scan circuitry to generate respective drive signals to drive a particular region of the illumination filaments to illuminate and form an image display.
  • the present invention uses a separate, independent light-emitting filament to be arranged or woven together to form an array of light-emitting filaments to form a light-emitting lattice, instead of the conventional method of integrally processing a light-emitting lattice on a flat substrate, the processing unit Changing from a large-area flat substrate to a filament structure greatly reduces process complexity and equipment complexity. And the size of the final illuminating or display device depends on the number of arranging/weaving of the illuminating filaments, and the size of the device can be easily freely expanded without limitation.
  • the present invention prepares each material layer on a central axis core electrode (data electrode shown) having a centripetal structure, and the scanning electrode on the thin support substrate is curved on the surface of the light-emitting filament, and the driving electric field concentration is good.
  • the illuminating area coverage is high, and the illuminating brightness and the illuminating efficiency are superior to the parallel stacked layer structure using the flat substrate.
  • the present invention prepares a light-transmissive or transparent annular electrode at a position on the surface of the light-emitting filament that contacts the scanning electrode, and corresponds to a position on the thin supporting substrate.
  • the scanning electrodes are connected to each other, or the upper and lower support members are used to make the scanning electrode surround the central axis core data electrode of the light-emitting filament in a 360-degree annular shape.
  • the processing unit of the invention is a filament structure, and the colored filaments of each color are separately processed separately, no complicated mask processing and etching process is required, the process is simple and convenient, the requirements on equipment and production environment are low, the yield rate is high, and the production cost is high. Compared with traditional flat substrate device processing, it has a big advantage. 5.
  • the invention adopts an auxiliary layer, which separates the data electrode and the luminescent material layer which are directly contacted, avoids the damage of the current to the luminescent material, effectively prolongs the service life of the luminescent material layer, uses the same luminescent material and the same driving method. Under the conditions, the service life can be obtained much longer than the conventional electroluminescent line structure.
  • the luminescent lifetime varies from thousands of hours to tens of thousands of hours depending on the luminescent material and the driving frequency.
  • the light-emitting lattice can be conveniently formed, thereby realizing matrix scanning for displaying various still and moving images.
  • the organic luminescent material When the organic luminescent material is used, it is convenient to cover or apply a protective film on the surface of the two-dimensional luminescent filament having a small surface area or to provide an auxiliary layer such as a protective shell layer to prevent the luminescent material from being degraded by water and oxygen.
  • the organic light-emitting material is sealed and protected, and the flexibility, the luminescence lifetime and the yield rate can be achieved, and the environmental stability superior to the existing organic electroluminescent structure is obtained.
  • FIG. 1 is a schematic view showing a first structure when a luminescent material is made of an inorganic luminescent material
  • FIG. 2 is a schematic view showing a second structure when the luminescent material is made of an inorganic luminescent material
  • 3 is a schematic view showing a third structure when the luminescent material is made of an inorganic luminescent material
  • FIG. 4 is a schematic view showing a fourth structure when the luminescent material is made of an inorganic luminescent material
  • Figure 5 is a first structural schematic view of the luminescent material using an organic luminescent material
  • FIG. 6 is a schematic view showing a second structure when the luminescent material is made of an organic luminescent material
  • FIG. 7 is a schematic view showing a third structure when the luminescent material is made of an organic luminescent material
  • FIG. 8 is a schematic view showing a fourth structure when the luminescent material is made of an organic luminescent material
  • FIG. 9 is a schematic diagram of an embodiment of a display device
  • Figure 10 is a schematic view showing another embodiment of the display device.
  • FIG. 11 is a schematic view showing the principle of illumination of the light-emitting structure of the present invention.
  • Figure 12 is a schematic view showing the composition of the display device
  • Figure 13 is a schematic view of a ring-shaped electrode of a light-emitting structure
  • Figure 14 is a graph showing the relationship between the luminance, the luminous efficiency, the charge density, and the driving voltage of the light-emitting structure of the present invention.
  • the reference numerals are as follows: 1-thin support substrate, 2-scan electrode, 3-bond material layer, 4-number Electrode, 5-Auxiliary layer, 6-luminescent material layer, 7-secondary auxiliary layer, 8-ring electrode, 51-electron injection layer, 52-electron transport layer, 71-hole transport layer, 72-hole Inject the layer.
  • the display device includes a data circuit, a control circuit, a scanning circuit and a first supporting component which are sequentially connected.
  • the supporting component comprises a thin supporting substrate 1 and a substrate functional unit, and the substrate functional unit comprises sequentially preparing or coating At least one scan electrode 2 and a fixing component are coated on the thin supporting substrate, and the light emitting filament unit is fixed on the supporting component by the fixing component,
  • the light-emitting filament unit comprises an array of filaments and a functional layer, the array of filaments being formed by rewinding one of the filaments or being arranged or braided by a plurality of filaments.
  • the data circuit is electrically connected to the light-emitting filament
  • the scan circuit is electrically connected to the scan electrode
  • the control circuit controls the data circuit and the scan circuit to generate a corresponding drive signal to drive a specific area of the light-emitting filament to emit light.
  • the material of the thin supporting substrate is a thin glass, a thin metal plate or an organic material film, the film substrate has a thickness of 5 um to 10 mm, and the scanning electrode has a thickness of 1 nm to 200 um.
  • the thin support substrate includes a rigid substrate and a flexible substrate.
  • the fixing component is at least one layer of bonding material 3 prepared or coated on the scanning electrode.
  • the fixing component is at least one layer of bonding material prepared or coated on the scanning electrode, or a low-melting heat sealing material (such as a low-melting glass), or other fixing structure capable of forming a stable joint (such as a riveted structure, a card) Buckle structure, etc.).
  • the adhesive material layer can be printed with a self-adhesive type or a transparent adhesive material.
  • the types of adhesives are mainly rubber type, resin type and hybrid type.
  • the main performance indicators of the adhesive are as follows:
  • Coating thickness 0.01 ⁇ 0.005mm
  • Viscosity (25 degrees): 6 ⁇ 0.5Pas ;
  • Peel strength >1000g / 2. 5cm (lOcm / min). It should be properly selected and matched to the substrate material according to the application and performance parameters.
  • Embodiment 2 As shown in FIG. 3, FIG. 4, FIG. 7, and FIG. 8, including two supporting components, the second and first supporting components are oppositely disposed, and the array of the light emitting filaments is disposed on the second supporting component and the first supporting component. Between the edges of the second support component and the edges of the first support component are bonded by respective layers of bonding material Set.
  • first supporting member and the second supporting member structure may be the same or different.
  • the light-emitting filaments include, in order from the center to the periphery, a conductive filament serving as a conductive filament and a light-emitting material layer 6 on the data electrode 4, and a material of the light-emitting material layer is an inorganic material.
  • the material of the luminescent material layer is an inorganic material.
  • the diameter or the longest diameter of the conductive filament serving as the data electrode is 0.001 mm to 10 mm.
  • the material of the data electrode and the scan electrode is a metal conductive material such as Au, Ag, Pt, Cu, Al, Fe, Cr, Ni, Ti, or the like, or a material containing one or more of the above-described conductor metals or alloys thereof.
  • the material of the data electrode and the scan electrode is a metal conductive material which is a non-metal conductive material, for example, contains carbon, graphite, carbon nanotubes, graphene, etc., or contains, for example, In203, Sn02, ZnO, CdO, TiN, In203:Sn (ITO).
  • non-metallic conductive compounds such as ZnO:In (IZO), ZnO:Ga (GZO), ZnO:Al (AZO), Sn02:F, Ti02:Ta, In203-ZnO, Cdln204, Cd2Sn04, Zn2Sn04, or doped poly a conductive organic compound or conductive polymer such as acetylene, polyaniline (PAN:), polythiophene (PTH:), polypyrrole PPy:), polyethylene dioxythiophene (PEDOT), or one or more of the above conductive materials Composite or mixed materials.
  • a conductive organic compound or conductive polymer such as acetylene, polyaniline (PAN:), polythiophene (PTH:), polypyrrole PPy:), polyethylene dioxythiophene (PEDOT), or one or more of the above conductive materials Composite or mixed materials.
  • the light-emitting filaments include, in order from the center to the periphery, a conductive filament serving as a data electrode, at least one auxiliary layer, a light-emitting material layer, at least one secondary auxiliary layer, and a ring-shaped electrode.
  • the secondary auxiliary layer is wrapped on the outer side of the luminescent material layer, and the annular electrode is wrapped around the secondary auxiliary layer.
  • Embodiment 5 respective functional layers between the conductive filament and the scanning electrode layer on the thin supporting substrate, wherein One or more functional layers may also be prepared or coated sequentially on a thin support substrate.
  • Embodiment 6 The thickness of the luminescent material layer is from 1 nm to 5000 um, and the material of the inorganic luminescent material layer is an inorganic electroluminescent material, such as ZnS:Sm, ZnS:Tb, ZnS:Tm, SrS:Eu, CaGa 2 S 4 :Eu ZnS:Mn, ZnS:Ho, CaS:Eu, SrGa 2 S 4 :Eu, SrS:Ce, CaSl-xSex:Eu, Ba 2 ZnS 3 :Mn, CaAl 2 S 4 :Eu, CaGa 2 S 4 :Ce , CaSrl-xSx: Eu, (Ca, Sr) Y 2 S 4 :Eu, CaS:Ce, SrGa 2 S 4 :Ce, ZnGa 2 0 4 :Eu, SrS:Ag, Cu, ZnS:Mn, CaS:Pb ,
  • the support assembly further includes a hole injection layer and a hole transport layer coated on the adhesive material layer, and the light-emitting filaments sequentially include conductive fines serving as data electrodes from the center to the periphery.
  • the wire, the electron injecting layer 51, the electron transporting layer 52, and the luminescent material layer, and the material of the luminescent material layer is an organic material.
  • the light-emitting filaments include, in order from the center to the periphery, a conductive filament serving as a data electrode, an electron injection layer, an electron transport layer, a light-emitting material layer, a hole transport layer 71, and a hole injection layer.
  • the material of the luminescent material layer is an organic material.
  • the diameter or the longest diameter of the conductive filament serving as the data electrode is 0.001 mm to 10 mm.
  • the material of the data electrode and the scanning electrode is a metal conductive material such as Au, Ag, Pt, Cu, Al, Fe, Cr, Ni, Ti, or the like, or a material containing one or more of the above-described conductor metals or alloys thereof.
  • the material of the data electrode and the scan electrode is a metal conductive material which is a non-metal conductive material, for example, contains carbon, graphite, carbon nanotubes, graphene, etc., or contains, for example, In203, Sn02, ZnO, CdO, TiN, In203:Sn (ITO).
  • ZnO In (IZO), ZnO: Ga (GZO), ZnO: Al (AZO), Sn02: F, Ti02: Ta, In203-ZnO, Cdln204, Cd2Sn04, Zn2Sn04, etc., or doped poly a conductive organic compound or conductive polymer such as acetylene, polyaniline (PAN:), polythiophene (PTH:), polypyrrole PPy:), polyethylene dioxythiophene (PEDOT), or one or more of the above conductive materials Composite or mixed materials.
  • PAN polyaniline
  • PTH polythiophene
  • PTH polypyrrole PPy
  • PEDOT polyethylene dioxythiophene
  • Embodiment 8 Each functional layer between the conductor filament and the scanning electrode layer on the thin supporting substrate, one or more layers of which are sequentially prepared or coated on the thin supporting substrate.
  • the thickness of the auxiliary layer and the secondary auxiliary layer are both 10 nm to 5000 um.
  • the second auxiliary layer and the auxiliary material layer is a dielectric material, such as BaTi03, Ta205, Si02, A1203, Ti02, M g O, BeO, SiC, A1N, BN , etc., or a composite material in which one or more materials or Mixed material.
  • the material of the auxiliary layer or the secondary auxiliary layer is an insulating material such as glass, ceramic dielectric material, or cotton yarn, paper, hemp, rayon, polyester, polyimide, fluoropolymer, epoxy resin, silicone resin. , a phenolic resin, a polyester, a polybutadiene, etc., or a composite or mixed material of one or more of the materials.
  • the material of the auxiliary layer or the secondary auxiliary layer contains nano materials for enhancing local electric field or achieving electron multiplication, such as carbon nanotubes, carbon nanowires, or other kinds of nano material structures.
  • Embodiment 9 The material of the luminescent material layer is an organic electroluminescent material, and the luminescent material layer has a thickness of from 1 nm to 500 um.
  • Table 1 shows.
  • Table 1 is a list of organic materials for the luminescent material layer Hole injection layer electron transport layer electron injection layer hole transport layer HTL
  • Flavonoids etc.
  • PPPs Poly(p-phenylenes)
  • PBD Idemitsu
  • PFOs Polyfluorenes
  • PTs Polythiophenes
  • DCJT DCJTB
  • FIG. 11 is a schematic view showing the principle of illumination of the light-emitting structure of the present invention.
  • the elongated cylindrical shape arranged vertically is a light-emitting filament, and the core of the light-emitting filament is a conductive filament, which is used as a data electrode and a data electrode.
  • the corresponding interfaces of the roads are connected.
  • the transversely arranged web-shaped rectangular strips are scan electrodes printed on the thin support substrate and connected to corresponding interfaces of the scanning circuit.
  • the scan electrode material is a transparent conductive material, it is not necessary to form a textured pattern; if an opaque conductive material is used, it is necessary to form a textured pattern to obtain sufficient light transmittance.
  • a bus electrode can be prepared on the scan electrode.
  • FIG. 14 is a graph showing relationship between light emission luminance, luminous efficiency, charge density, and driving voltage of the light-emitting structure of the present invention, wherein a curve is a light-emitting luminance (cd/m 2 ) curve, and b curve is a luminous efficiency (lm/w).
  • the curve, c curve is the charge density c/cm 2 ) curve.
  • the luminescent material will only illuminate when the voltage exceeds a certain threshold Vth. As the driving voltage increases, the luminance of the light rises rapidly and gradually becomes saturated.
  • the vertically aligned light-emitting filaments and the laterally aligned scan electrodes intersect to form a matrix structure.
  • the matrix scanning of the light-emitting lattice can be formed by the control circuit modulating the matching of the driving signals on the data electrodes and the scanning electrodes, and further combining to form an image display having a certain gray level.
  • the front and rear electrodes may be directly crossed to form a passive matrix structure, or may be an active matrix structure using a TFT.
  • Figure 12 is a schematic view showing the composition of the display device.
  • the thin lines arranged in the figure indicate three colors of red, green and blue, and the array of light-emitting filaments (the core is a data electrode) having different illuminating colors, and the surface of the filament array is closely attached.
  • the data circuit and the scanning circuit are respectively connected to the data electrode in the light emitting filament and the scan electrode on the thin supporting substrate via different interfaces, and the control circuit generates a corresponding matrix logic control signal according to the video signal, and the control data circuit and the scanning circuit follow A certain timing generation drive signal is sent to the corresponding data electrode and scan electrode to form a matrix scan illumination or image display of the illumination dot matrix.
  • Fig. 13 is a schematic view of the ring-shaped electrode, the ring-shaped electrode is annularly coated on the surface of the light-emitting filament, and is connected to the scan electrode to be electrically connected.
  • the ring-shaped electrode is an extension portion of the scan electrode, so that the scan electrode can cover the surface of the luminescent material (light-emitting point) as optimally as possible, and the effective light-emitting area of the light-emitting point position can be fully utilized, and the light-emitting point position is well formed. Concentric axially concentrated driving electric field distribution, effectively improving luminous brightness and luminous efficiency.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

Une structure lumineuse basée sur un principe d'électroluminescence et un dispositif d'affichage, selon l'invention, comprennent un premier composant de support et une unité de filaments lumineux. Le premier composant de support comporte un mince substrat de support (1) et une unité de fonction de substrat. L'unité de fonction de substrat comprend au moins une couche d'électrode de balayage (2) et un composant de fixation (3) qui sont préparés ou revêtus sur le mince substrat de support en séquence. L'unité de filaments lumineux est fixée sur le premier composant de support par le composant de fixation (3) et comprend une matrice de filaments formée en réenroulant, arrangeant ou tissant au moins un filament lumineux. L'utilisation de structures d'unités de fibres lumineuses séparées et mutuellement indépendantes permet de réduire la complexité de processus ainsi que la complexité de dispositif. La taille finale de la structure lumineuse ou du dispositif d'affichage dépend de la quantité des filaments lumineux arrangés/tissés, et la taille peut être agrandie de manière pratique et libre, sans limite.
PCT/CN2014/076895 2013-05-22 2014-05-06 Structure lumineuse basée sur un principe d'électroluminescence et dispositif d'affichage WO2014187236A1 (fr)

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CN103296048A (zh) * 2013-05-22 2013-09-11 李尚霖 一种基于电致发光原理的发光结构及显示器件
CN203260278U (zh) * 2013-05-22 2013-10-30 李尚霖 一种基于电致发光原理的发光结构及显示器件

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