WO2024083344A1 - Empilement d'affichage souple et appareil comprenant un tel empilement d'affichage - Google Patents

Empilement d'affichage souple et appareil comprenant un tel empilement d'affichage Download PDF

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Publication number
WO2024083344A1
WO2024083344A1 PCT/EP2022/079472 EP2022079472W WO2024083344A1 WO 2024083344 A1 WO2024083344 A1 WO 2024083344A1 EP 2022079472 W EP2022079472 W EP 2022079472W WO 2024083344 A1 WO2024083344 A1 WO 2024083344A1
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WO
WIPO (PCT)
Prior art keywords
structural element
cover layer
matrix
reflective
display stack
Prior art date
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PCT/EP2022/079472
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English (en)
Inventor
Hayk Khachatryan
Ilkka Niemela
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to PCT/EP2022/079472 priority Critical patent/WO2024083344A1/fr
Publication of WO2024083344A1 publication Critical patent/WO2024083344A1/fr

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/873—Encapsulations
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/875—Arrangements for extracting light from the devices
    • H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • H10K59/875—Arrangements for extracting light from the devices

Definitions

  • the disclosure relates to a flexible display stack for an electronic apparatus, the flexible display stack comprising a display structure and a cover structure superimposed onto the display structure.
  • True flexible displays allow the display of an electronic apparatus to be bent and flexed, e.g., in response to folding the electronic apparatus.
  • An OLED display stack requires layers providing durability, a user interface, and optical functionality. At least one layer each of a hard coating, a cover window, a touch sensor, and a circular polarizer is generally included, and these must be laminated together with adhesive.
  • the hard coating not only defines the appearance and premium look of the apparatus, but functions as a protective layer protecting the display stack from the effect of mechanical impact, scratches, wear, etc. As its name suggests, the hard coating must be relatively hard, to provide such protection, but must at the same time be sufficiently flexible, to allow bending.
  • the hard coating material is conventionally made by two components, a hard component and a soft component. By controlling the ratio of these components, it is possible to fine-tune the hardness and flexibility of the hard coating.
  • display specifications require the hard coating to pass 200 000 cyclic bending cycles where the strain may exceed up to 3%, and at the same time the hard coating has to be hard enough to pass a nail test or standard steel wool test.
  • a further polarizing layer is usually added to the display stack. Although such an added polarizing can solve the color washing issue, it also decreases the light emotion from the display pixels significantly. To compensate for this, the display pixels have to be much brighter; hence, the power consumption is significantly increased and display lifetime decreased.
  • the polarizing layer also has poor flexibility and cannot be used for true flexible displays (e.g. foldable or rollable displays).
  • a flexible display stack for an electronic apparatus comprising a display structure and a cover structure superimposed onto the display structure.
  • the cover structure comprises a first cover layer and at least a second cover layer superimposed onto the first cover layer.
  • the first cover layer comprises a continuous structural element comprising a plurality of voids and a continuous matrix configured to fill the voids and at least partially enclose the continuous structural element
  • the second cover layer also comprises a continuous structural element comprising a plurality of voids and a continuous matrix configured to fill the voids and at least partially enclose the continuous structural element.
  • the structural element and the matrix of the first cover layer comprise materials having reflective indices within a first reflective index range
  • the structural element and the matrix of the second cover layer comprise materials having reflective indices within a second reflective index range.
  • cover structure i.e., a hard coating
  • the cover structure is sufficiently flexible to bend without cracking, and at the same time hard enough to provide mechanical protection for the display structure.
  • cover structure reflections induced by ambient light as well as internal light from the display structure, can be reduced by means of destructive interference.
  • the cover structure comprises at least one further cover layer superimposed onto the second cover layer, the further cover layer comprising a continuous structural element comprising a plurality of voids and a continuous matrix configured to fill the voids and at least partially enclose the structural element, the structural element and the matrix of the further cover layer comprising materials having reflective indices within a third reflective index range, reducing the reflections within the cover structure even more.
  • the display structure comprises an OLED panel layer, allowing the solution to be used in a currently preferred type of display panel.
  • the structural element(s) comprise(s) a material having one reflective index and the matrix/matrices comprise(s) a material having a further reflective index, the reflective indices being within the first reflective index range, the second reflective index range, and a third reflective index range, improving the antiglare and antireflection properties of the cover structure.
  • a difference between the reflective indices within the first reflective index range, a difference between the reflective indices within the second reflective index range, and a difference between the reflective indices within the third reflective index range is ⁇ 1.2%. This prevents the display stack from being perceived as hazy or somehow blurred. A larger difference in reflective index value may lead to the structural element reflecting and diffusively scattering light, which may be perceived as haziness.
  • a difference between the first reflective index range, the second reflective index range, and/or the further reflective index range is ⁇ 18%, allowing light emitted from the display structure to reach the user of the display stack with reduced reflections.
  • the voids of each structural element have volumes that correspond to X/(2xR), A being a wavelength of radiation, the radiation being emitted by the display structure or incident radiation from an exterior, and R being a reflective index value representative of the first reflective index range, the second reflective index range, or the third reflective index range.
  • A being a wavelength of radiation
  • R being a reflective index value representative of the first reflective index range, the second reflective index range, or the third reflective index range.
  • the reflective index value for the first cover layer is one of the reflective indices for the first cover layer
  • the reflective index value for the second cover layer is one of the reflective indices for the second cover layer
  • the reflective index value for the further cover layer is one of the reflective indices for the further cover layer
  • the reflective index value is an estimate generated by means of the reflective indices for the first cover layer, an estimate generated by means of the reflective indices for the second cover layer, and an estimate generated by means of the reflective indices for the further cover layer.
  • the cover structure comprises an optically transparent material, allowing the display structure to be visible to the user of the apparatus.
  • the structural element and/or the matrix comprises optically transparent material, allowing the display structure to be visible to the user of the apparatus.
  • one of the structural element and the matrix comprises inorganic material and the other of the structural element and the matrix comprises organic material. One of these materials provides hardness while the other one of the materials provide flexibility.
  • the structural element comprises inorganic material and the matrix comprises organic material.
  • the inorganic material provides a relatively harder frame which reinforces the relatively softer, and more flexible, organic matrix.
  • the relatively flexible, organic matrix provides the relatively harder, inorganic frame with the needed flexibility.
  • the structural element is a three- dimensional element and the voids are distributed evenly in three dimensions, allowing the cover element to have the same harness and the same flexibility throughout, and to have any suitable thickness.
  • the structural element is a skeleton frame or a grid structure.
  • a structure allows any force applied, e.g. due to impact, to be distributed over a large area, as compared to the specific point of impact, hence improving the durability of the cover structure.
  • the matrix comprises incompressible material such that force from e.g. impact can be distributed across the cover layer.
  • the structural element comprises a porous film, allowing simple and efficient manufacture of the cover structure and, hence, the display stack.
  • the structural element comprises silicon dioxide, titanium dioxide, aluminum oxide, silicon nitride, silicon oxynitride, and/or silicon oxycarbide, allowing the most suitable material to be selected based on individual prerequisites and objectives.
  • the matrix comprises an organic monomer or polymer, the matrix providing flexibility to the display stack while facilitating simple manufacture.
  • the matrix comprises thermoplastic polyurethane or siloxane-based elastomers, or perylene-based polymers, the matrix providing flexibility to the display stack while facilitating simple manufacture.
  • At least one of the matrices comprises at least one of a scratch-resistant material, a self-healing material, an anti-fingerprint material, and an anti-glare material, further improving the durability of the cover structure while also providing a plurality of characteristics to the display stack.
  • the flexible display stack comprises antiviral material, the antiviral material being a separate layer superimposed onto the second cover layer or the further cover layer; or the antiviral material being comprised within the second cover layer or the further cover layer, allowing a display stack which is constantly kept virus-free, or at least reducing the amount of virus on the display stack surface.
  • an electronic apparatus comprising a flexible display stack according to the above, wherein the cover structure of the flexible display stack forms a peripheral surface of the electronic apparatus.
  • a cover structure i.e., a hard coating, which is suitable for different types of bendable displays such as slidable or rollable displays.
  • the cover structure is sufficiently flexible to bend without cracking, and at the same time hard enough to provide mechanical protection for the display structure.
  • a method of manufacturing a flexible display stack comprising the steps of generating a first cover layer by depositing a porous and continuous inorganic structural element, coating the structural element with an organic monomer matrix, and curing the matrix; and generating a second cover layer by depositing a porous and continuous inorganic structural element on top of the first cover layer, coating the structural element with an organic monomer matrix, and curing the matrix.
  • the method allows for simple, reliable, and efficient manufacture of a flexible display stack where inorganic material provides a relatively harder frame which reinforces the relatively softer, and more flexible, organic matrix.
  • the relatively flexible, organic matrix provides the relatively harder, inorganic frame with the needed flexibility.
  • the method comprises the further steps of generating at least one further cover layer by depositing a porous and continuous inorganic structural element on top of the second cover layer, coating the structural element with an organic monomer matrix, and curing the matrix.
  • the matrix is configured to shrink ⁇ 2% while curing, such that the shape and volume of the cover structure is not affected and/or subjected to inner stress.
  • the structural element is deposited by means of physical or chemical deposition methods, such methods being cost-effective and simple.
  • the deposition method is one of pulsed laser deposition, EB deposition, resistive or arc evaporation, spattering, CVD, PE-CVD, MOCVD, sol gel, and spray pyrolysis, allowing the flexible display stack to be manufactured using a range of methods.
  • the organic monomer matrix is coated onto the structural element by means of spin coating, slit coating, dipping, or infiltration from a gas phase, allowing the flexible display stack to be manufactured using a range of methods.
  • the method further comprises the step of pre-treating the structural element with an adhesion-promoting additive prior to coating the structural element with the organic monomer matrix, improving the penetration of the matrix into the voids of the structural element.
  • the adhesion promoting additive is a silane, preferably an aminosilane. The additive improves the wettability of the structural element by forming a nanolayer which enhances the coating and leveling of other polymers.
  • Fig. 1 shows a schematic side view of a flexible display stack in accordance with an example of the embodiments of the disclosure
  • Fig. 2 shows a schematic side view of a cover structure of a flexible display stack in accordance with an example of the embodiments of the disclosure
  • Fig. 3a shows a schematic perspective view of a cover structure of a flexible display stack in accordance with an example of the embodiments of the disclosure
  • Fig. 3b shows a section of the example shown in Fig. 3a in more detail
  • Figs. 4a to 4f show schematic side views of method steps for manufacturing a flexible display stack in accordance with an example of the embodiments of the disclosure.
  • the present invention relates to an electronic apparatus 2 comprising a flexible display stack 1, described in detail further below, wherein a cover structure 4 of the flexible display stack 1 forms a peripheral surface of the electronic apparatus 2, i.e., an outer surface to be engaged by a user, e.g., by touching.
  • the electronic apparatus 2 may be a smartphone, a wearable, a tablet, a screen for a tv or a computer, or any kind of electronic apparatus 2 wherein a reflection-free display is important.
  • the electronic apparatus 2 may comprise a housing (not shown) in addition to the flexible display stack 1.
  • the flexible display stack 1 may be slidable or rollable relative the housing such that a bent section of the flexible display stack 1 moves in response to the flexible display stack 1 sliding or rolling relative the housing.
  • the housing may comprise two or more interconnected housing sections, the housing sections being interconnected by hinges or one housing section being slidingly arranged relative the other such that one housing section slides into, and out from, the other housing section.
  • the flexible display stack 1 comprises a display structure 3 and a cover structure 4 superimposed onto the display structure 3, the cover structure 4 comprising a first cover layer 4a and at least a second cover layer 4b superimposed onto the first cover layer 4a, the first cover layer 4a comprising a continuous structural element 5a comprising a plurality of voids 6a and a continuous matrix 7a configured to fill the voids 6a and at least partially enclose the continuous structural element 5a, the second cover layer 4b comprising a continuous structural element 5b comprising a plurality of voids 6b and a continuous matrix 7b configured to fill the voids 6b and at least partially enclose the continuous structural element 5b, wherein the structural element 5a and the matrix 7a of the first cover layer 4a comprise materials having reflective indices R11, R12 within a first reflective index range Rl, and wherein the structural element 5b and the matrix 7b of the second cover layer 4b comprise materials having reflective indices R21, R22 within a second reflective index range R2.
  • the flexible display stack 1 comprises a display structure 3 and a cover structure 4 superimposed onto the display structure 3.
  • the display structure 3 may comprise a plurality of discrete layers superimposed, i.e., stacked, onto each other as schematically illustrated in Fig. 1.
  • the display structure 3 may for example comprise an OLED panel layer, a flexible substrate, a polarizing layer, and a touch sensor layer.
  • the cover structure 4 comprises a first cover layer 4a and at least a second cover layer 4b superimposed onto the first cover layer 4a.
  • the cover structure 4 may also comprise at least one further cover layer 4c superimposed onto the second cover layer 4b, i.e., the cover structure 4 may comprise one or several further cover layers 4c superimposed onto each other.
  • the first cover layer 4a comprises a continuous structural element 5a, comprising a plurality of voids 6a, and a continuous matrix 7a, a matrix being a material in which something is enclosed or embedded (as for protection or study).
  • the matrix 7a is configured to fill the voids 6a formed within the continuous structural element 5a and at least partially enclose the continuous structural element 5a.
  • the second cover layer 4b also comprises a continuous structural element 5b, comprising a plurality of voids 6b, and a continuous matrix 7b configured to fill the voids 6b and at least partially enclose the continuous structural element 5b.
  • any further cover layer 4c comprises a continuous structural element 5c, comprising a plurality of voids 6c, and a continuous matrix 7c configured to fill the voids 6c and at least partially enclose the structural element 5c.
  • the structural element 5a, 5b, 5c may be a skeleton frame or, in other words, a grid structure.
  • the structural element 5a, 5b, 5c is a three-dimensional element and the voids 6a, 6b, 6c are distributed evenly in three dimensions and interconnected.
  • the structural element 5a, 5b, 5c may comprise a porous film.
  • the continuous matrix 7a, 7b, 7c is configured to fill the voids 6a, 6b, 6c and at least partially enclose the structural element 5a, 5b, 5c, such not only the voids 6a, 6b, 6c are filled with matrix 7a, 7b, 7c but also at least part of the outer surfaces of the structural element 5a, 5b, 5c may be covered with matrix 7a, 7b, 7c.
  • the entire structural element 5a, 5b, 5c may, in other words, be covered by the matrix 7a, 7b, 7c.
  • the matrix 7a, 7b, 7c is continuous such that all matrix material is interconnected as one piece, even though it encloses the structural element 5a, 5b, 5c.
  • Any defects within the matrix 7a, 7b, 7c may have a total volume ⁇ 1% of the total volume of the matrix 7a, 7b, 7c, such that the main part of the matrix is in direct contact with the structural element 5a, 5b, 5c. Any contact gaps, i.e., defects in the form of air bubbles, reduce the durability of the cover layer.
  • the cover structure 4 may comprise an optically transparent material.
  • the structural element 5a, 5b, 5c and/or the matrix 7a, 7b, 7c of the cover structure 4 may comprise optically transparent material.
  • the structural element 5a, 5b, 5c may comprise a first material and the matrix 7a, 7b, 7c may comprise a second material different from the first material.
  • one of the structural element 5a, 5b, 5c and the matrix 7a, 7b, 7c may comprise inorganic material and the other of the structural element 5a, 5b, 5c and the matrix 7a, 7b, 7c may comprise organic material.
  • the structural element 5a, 5b, 5c comprises inorganic material and the matrix 7a, 7b, 7c comprises organic material.
  • the structural element 5a, 5b, 5c may comprise silicon dioxide, titanium dioxide, aluminum oxide, silicon nitride, silicon oxynitride, and/or silicon oxycarbide, or any suitable material which improves wear resistance.
  • the matrix 7a, 7b, 7c may comprise incompressible material, and/or it may comprise an organic monomer or polymer. More specifically, the matrix 7a, 7b, 7c may comprise thermoplastic polyurethane or siloxane-based elastomers, or perylene-based polymers.
  • the matrix 7a, 7b, 7c may comprise silane or fluorsilane, providing an antifingerprint effect, as well as a reflective index tunable resin providing flexibility and optical performance.
  • the matrix 7a, 7b, 7c may be a low-viscosity solution free of reactive solvents.
  • a matrix 7a, 7b, 7c comprising cellulose nanocrystals can form a transparent CNC film when used together with a structural element 5a, 5b, 5c comprising titanium dioxide.
  • the CNC film may furthermore have a thin layer of titanium dioxide distributed across the top surface.
  • At least one of the matrices 7a, 7b, 7c may comprise at least one of a scratchresistant material, a self-healing material, an anti-fingerprint material, and an anti-glare material.
  • at least the matrix 7b, 7c of the outermost cover layer 4b, 4c comprises such materials.
  • the matrix 7a, 7b, 7c may, in other words, be configured to recover its initial shape after being scratched or damaged.
  • the scratch-resistant material may be a high tensile modulus polymer. Self-healing materials are conventionally soft and easily scratched, however, combining such a material with a harder structural element 5 a, 5b, 5 c can lead to a cover structure 4 having sufficient hardness as well as sufficient flexibility.
  • the matrix 7a, 7b, 7c can be configured to withstand smudges as well as reduce reflections.
  • the flexible display stack 1 may comprise antiviral material, the antiviral material being a separate layer superimposed onto the second cover layer 4b or the further cover layer 4c. Furthermore, the antiviral material may be comprised within the second cover layer 4b or the further cover layer 4c.
  • the substrate, onto which the structural element 5a, 5b, 5c and/or the matrix 7a, 7b, 7c are deposited may comprise a polymer such as polyethylene terephthalate, polyimide, or colorless polyimide, glass, or bio-based polymers such as cellulose nanocrystals (CNC) or cellulose nanofibers (CNF).
  • the structural element 5a and the matrix 7a of the first cover layer 4a comprise materials having reflective indices Rl l, R12 within a first reflective index range Rl
  • the structural element 5b and the matrix 7b of the second cover layer 4b comprise materials having reflective indices R21, R22 within a second reflective index range R2.
  • the structural element 5c and the matrix 7c of the further cover layer 4b comprise materials having reflective indices R31, R32 within a third reflective index range R3.
  • the structural element 5a, 5b, 5c comprises a material having a reflective index Rl l, R21, R31 and the matrix 7a, 7b, 7c comprises a material having a reflective index R12, R22, R32; reflective indices Rl l, R12 being within the first reflective index range Rl, reflective indices R21, R22 being within the second reflective index range R2, and reflective indices R31, R32 being within a third reflective index range R3.
  • the difference between the reflective indices Rl l, R12 within the first reflective index range Rl, the difference between the reflective indices R21, R22 within the second reflective index range R2, as well as the difference between the reflective indices R31, R32 within the third reflective index range R3, may be ⁇ 1.2%.
  • Each cover layer 4a, 4b, 4c comprise two materials, i.e. a structural element 5a, 5b, 5c and a matrix 7a, 7b, 7c, and the reflective index of one of these materials may differ maximally 1.2% from the reflective index of the other of these two materials in order to avoid haziness.
  • the difference between the first reflective index range Rl, the second reflective index range R2, and/or the further reflective index range R3 may be ⁇ 18%.
  • the reflective indices used within one layer may, in other words, differ from the reflective indices used within another layer by maximally 18 %.
  • the voids 6a, 6b, 6c of each structural element 5a, 5b, 5c may have volumes that correspond to X/2xR, X being the wavelength of radiation either emitted by the display structure 3 itself or being incident radiation from the exterior, such as sunlight or light from lamps.
  • R is a reflective index value representative of the first reflective index range Rl, the second reflective index range R2, or the third reflective index range R3.
  • the width, possibly diameter, of the voids may be, e.g., as small as 200-250 nm.
  • the reflective index value R for the first cover layer 4a may be one of the reflective indices Rl l, R12 or it may be an estimate, a so-called effective reflective index, generated by means of the reflective indices Rl l, R12.
  • the estimate may be calculated as an average of the reflective index value Rl l and the reflective index value R12.
  • the reflective index value R for the second cover layer 4b may be one of the reflective indices R21, R22 or it may be an estimate generated by means of the reflective indices R21, R22.
  • the reflective index value R for the further cover layer 4c may be one of the reflective indices R31, R32 or it may be an estimate generated by means of the reflective indices R31, R32.
  • the present invention also relates to a method of manufacturing the flexible display stack 1.
  • the method comprises the steps of generating a first cover layer 4a, shown in Fig. 4c, by depositing a porous and continuous inorganic structural element 5a, see Fig. 4a, coating the structural element 5a with an organic monomer matrix 7a, see Fig. 4b, and curing the matrix 7a such that the structural element 5a and matrix 7a together form the first cover layer 4a.
  • the method also comprises the subsequent steps of generating a second cover layer 4b, shown in Fig. 4f, by depositing a porous and continuous inorganic structural element 5b on top of the first cover layer 4a, see Fig. 4d, coating the structural element 5b with an organic monomer matrix 7b, see Fig. 4e, and curing the matrix 7b such that the structural element 5b and matrix 7b together form the second cover layer 4b, and the first cover layer 4a and the second cover layer 4b together form the cover structure 4.
  • the method may also comprise the further steps of generating at least one further cover layer 4c (not shown) by depositing a porous and continuous inorganic structural element 5c on top of the second cover layer 4b, coating the structural element 5c with an organic monomer matrix 7c, and curing the matrix 7c such that the structural element 5c and matrix 7c together form a further cover layer 4c, and the first cover layer 4a, the second cover layer 4b, and any further cover layers 4c together form the cover structure 4.
  • generating at least one further cover layer 4c (not shown) by depositing a porous and continuous inorganic structural element 5c on top of the second cover layer 4b, coating the structural element 5c with an organic monomer matrix 7c, and curing the matrix 7c such that the structural element 5c and matrix 7c together form a further cover layer 4c, and the first cover layer 4a, the second cover layer 4b, and any further cover layers 4c together form the cover structure 4.
  • the structural element 5a, 5b, 5c is, in other words, saturated with organic monomer matrix 7a, 7b, 7c, the organic monomer matrix 7a, 7b, 7c penetrating and filling the voids 6a, 6b, 6c of the structural element 5a, 5b, 5c completely.
  • the voids 6a, 6b, 6c are interconnected such that they form a network of caves and channels, comprising of voids 6a, 6b, 6c and interconnecting conduits, such that the matrix 7a, 7b, 7c can fill the entire network and form one integral element.
  • the voids 6a, 6b, 6c may have spherical or irregular three-dimensional shapes, and the channels may have cylindrical shapes.
  • the matrix 7a, 7b, 7c may be configured to shrink ⁇ 2% while curing.
  • the structural element 5a, 5b, 5c may be deposited by means of physical or chemical deposition methods.
  • the deposition method may be one of pulsed laser deposition, EB deposition, resistive or arc evaporation, spattering, CVD, PE-CVD, MOCVD, sol gel, and spray pyrolysis.
  • the organic monomer matrix 7a, 7b, 7c may be coated onto the structural element 5a, 5b, 5c by means of spin coating, slit coating, dipping, or infiltration from a gas phase.
  • the method may furthermore comprise an intermediate step of pre-treating the structural element 5a, 5b, 5c with an adhesion-promoting additive prior to coating the structural element 5a, 5b, 5c with the organic monomer matrix 7a, 7b, 7c, i.e., between the step shown in Figs. 4a and 4d and the further step shown in Figs. 4b and 4e.
  • the adhesion-promoting additive improves the penetration of the matrix 7a, 7b, 7c into the voids 6a, 6b, 6c of the structural element 5a, 5b, 5c.
  • the adhesion-promoting additive may be a silane, preferably an aminosilane, forming a nanolayer on the structural element 5a, 5b, 5c.

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Abstract

La présente invention concerne un empilement d'affichage souple (1) comprenant une structure d'affichage (3) et une structure de couverture (4) comprenant une première couche de couverture (4a) et au moins une seconde couche de couverture (4b). La première couche de couverture (4a) comprend un élément structural continu (5a) ayant une pluralité de vides (6a) et une matrice continue (7a) configurée pour remplir lesdits vides (6a) et enfermer au moins partiellement ledit élément structural continu (5a), ledit élément structural (5a) et ladite matrice (7a) comprenant des matériaux ayant des indices de réflexion (R11, R12) dans une première plage d'indices de réflexion (R1). La seconde couche de couverture (4b) comprend un élément structural continu (5b) ayant une pluralité de vides (6b) et une matrice continue (7b) configurée pour remplir lesdits vides (6b) et enfermer au moins partiellement ledit élément structural continu (5b), ledit élément structural (5b) et ladite matrice (7b) comprenant des matériaux ayant des indices de réflexion (R21, R22) dans une seconde plage d'indices de réflexion (R2).
PCT/EP2022/079472 2022-10-21 2022-10-21 Empilement d'affichage souple et appareil comprenant un tel empilement d'affichage WO2024083344A1 (fr)

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Citations (5)

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