Liquid metal LED display screen and its preparation method and application

Abstract

The present invention relates to the technical field of LED display screens, and in particular to a liquid metal LED display screen, a preparation method, and applications thereof. The liquid metal LED display screen provided by the present invention comprises: a transparent substrate, a liquid metal conductive layer disposed on the transparent substrate, a transparent insulating encapsulation layer disposed on the liquid metal conductive layer, a transparent protective layer disposed on the transparent insulating encapsulation layer, and LED lamp beads embedded in the transparent protective layer, wherein the liquid metal conductive layer is a mesh-shaped fine-wire circuit or a conductive film. The liquid metal LED display screen provided by the present invention has the advantages of low cost, high conductivity, high precision, high adhesion, high light transmittance, high adaptability, and long service life.

Description

Technical Field

[0001] The present invention relates to the technical field of LED display screens, and in particular to a liquid metal LED display screen and a preparation method and application thereof. Background Art

[0002] With the development and widespread application of LED display technology, traditional rigid box-type displays are no longer able to meet market demand due to their complex structure, opacity, inconvenient installation and disassembly, poor waterproofing and dustproofing, and short service life. In recent years, with the growing demand for LED displays, transparent LED glass displays and flexible LED displays have emerged. These displays offer transparency, flexibility, ease of installation, and aesthetics, and are widely used in our daily lives.

[0003] Existing transparent LED glass displays primarily use magnetron sputtering of ITO powder to form a conductive layer, or chemical plating or high-temperature spraying of copper, chromium, nickel, titanium, molybdenum, and other metal conductive coatings. The surface resistance of the ITO conductive layer causes a voltage drop in the conductive area away from the power output, resulting in poor conductivity and uneven LED brightness, affecting visual quality and increasing costs. Conductive coatings formed through chemical plating and spraying are thin, have wide lines, and exhibit poor adhesion to the glass, severely impacting the glass's light transmittance and stability. Furthermore, uneven heating and cooling during production and use can lead to cracking or shattering of the glass in transparent glass displays.

[0004] LED displays primarily use photolithography, imprinting, and wet etching to create conductive circuits. However, large-scale conductive circuits cannot be produced and can only be fabricated on specific materials. This results in complex processes, low circuit precision, high resistance, and high costs. During production, LED soldering and packaging steps can easily damage the LEDs, resulting in low yields. During use, if a LED is partially damaged, repairs require the destruction of the transparent protective layer, which is difficult and seriously affects light transmittance and appearance.

[0005] Therefore, there is an urgent need to develop an LED display screen with low cost, high conductivity, high precision, high adhesion, high adaptability, high light transmittance and long service life. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a liquid metal LED display screen and a preparation method and application thereof.

[0007] In a first aspect, the liquid metal LED display provided by the present invention includes: a transparent substrate, a liquid metal conductive layer arranged on the transparent substrate, a transparent insulating packaging layer arranged on the liquid metal conductive layer, a transparent protective layer arranged on the transparent insulating packaging layer, and LED lamp beads embedded in the transparent protective layer, wherein the liquid metal conductive layer is a mesh fine line circuit or a conductive film.

[0008] The liquid metal LED display provided by the present invention solves the problems of high production cost and high resistance of the conductive circuits of traditional LED display screens, reduces the cost of LED display screens, improves the conductivity of the display screen circuits, eliminates voltage drops, and ensures the uniformity of the luminous brightness of the LED display screen. The present invention also solves the problems of poor adaptability of the conductive wires of traditional LED display screens to the substrate, poor adhesion of the circuits, low circuit precision, and poor light transmittance, improves the adhesion of the conductive circuits of the LED display screen and the adaptability of the substrate, improves the precision of the fine lines of the circuit, and thus improves the transparency of the LED display screen. The present invention can also solve the problems of complex production processes, low production efficiency and yield of traditional LED display screens, simplifies the production process and equipment, and improves production efficiency and yield. In addition, the present invention can solve the problem of difficult maintenance of traditional LED display screens. Through the optimization of structure and process, the maintenance of the display screen during production and use is made easier, while not affecting the light transmittance and appearance of the display screen.

[0009] Preferably, the film thickness of the liquid metal conductive layer is 0.5 μm to 250 μm; and / or the thin line width of the liquid metal conductive layer is 1 μm to 200 μm.

[0010] By creating a liquid metal conductive layer of a specific material, thickness, and width, the present invention can control the conductivity, light transmittance, rigidity, flexibility, and adhesion of the conductive circuit. This further addresses the problems of poor conductivity, high heat generation, poor light transmittance, and poor adhesion of traditional LED displays. This results in LED displays with improved light transmittance and conductivity, lower heat generation, more uniform and stable display brightness, better display effects, and longer service life. Furthermore, through material and ratio design, a flexible liquid metal conductive layer with high substrate adaptability can be produced, significantly improving the adaptability of traditional displays. LED displays can be manufactured on any surface.

[0011] Preferably, the liquid metal conductive layer is formed by adhering raw materials to the transparent substrate by printing, printing, spraying or transferring according to the designed circuit, and the raw material of the liquid metal conductive layer is liquid metal or liquid metal composite material.

[0012] More preferably, the melting point of the liquid metal is -40°C to 300°C; the liquid metal includes one or more of gallium-based liquid metal, bismuth-based liquid metal, indium-based liquid metal, and tin-based liquid metal; the liquid metal composite material is a mixture of liquid metal powder and an organic mixture in a mass ratio of (50-90): (10-50); the liquid metal powder is selected from one or more of bismuth-based liquid metal, indium-based liquid metal, and tin-based liquid metal, and the organic mixture is a mixture of a matrix resin, a curing agent, a diluent, a thickener, a plasticizer, and a toughening agent in a mass ratio of 100: (10-20): (1-10): (1-3): (1-2): (1-2).

[0013] More preferably, the matrix resin is selected from one or more of epoxy resin, phenolic resin, urea-formaldehyde resin, melamine formaldehyde resin, furan resin, silicone resin, polyester resin, polyamide resin, acrylic resin, polyurethane, vinyl resin, hydrocarbon resin, polyether resin; the curing agent is selected from one or more of amine curing agent, acid anhydride curing agent, resin curing agent, imidazole curing agent and latent curing agent; the diluent is selected from one or more of alkylene glycidyl ether, butyl glycidyl ether, One or more of glycerol ether, 1,4-butanediol diglycidyl ether, ethylene glycol diglycidyl ether, phenyl glycidyl ether, polypropylene glycol diglycidyl ether, C12-14 fatty glycidyl ether, benzyl glycidyl ether, 1,6-hexanediol diglycidyl ether, o-cresyl glycidyl ether, neopentyl glycol diglycidyl ether, ethanol, acetone, dibutyl phthalate, dioctyl phthalate, styrene, diallyl phthalate, toluene and xylene; the thickener is selected from inorganic One or more of salt thickeners, fatty alcohols, fatty acid thickeners, alkanolamide thickeners, ether thickeners, ester thickeners, and amine oxide thickeners; the plasticizer is selected from one or more of phthalates, di(2-ethylhexyl) phthalate, dibutyl phthalate, diethyl phthalate, aliphatic dibasic acid esters, fatty acid esters, benzene polyacid esters, polyol esters, epoxy hydrocarbons, and alkyl sulfonates; the toughening agent is selected from one or more of carboxyl liquid nitrile rubber, carboxyl-terminated liquid One or more of nitrile rubber, polysulfide rubber, liquid silicone rubber, polyether, polysulfone, polyimide, nano calcium carbonate, nano titanium dioxide, carboxylated nitrile rubber, liquid nitrile rubber, polyvinyl butyral, polyethersulfone, polyphenylene ether ketone, water-soluble phenolic resin, carboxylated nitrile latex, polyvinyl alcohol, acrylate rubber, carboxylated nitrile rubber, chloroprene rubber, chlorosulfonated polyethylene, ABS resin, acrylate rubber, ABS, SBS, SEBS, polyvinyl acetate, and vinyl acetate emulsion.

[0014] Preferably, at least one vacuum fixing suction cup is provided on one side of the transparent substrate to fix the liquid metal LED display; the liquid metal conductive layer is provided on the other side of the transparent substrate. The plurality of vacuum fixing suction cups provided in the present invention can be used to fix the liquid metal LED display to a smooth glass wall surface.

[0015] Further preferably, the thickness of the transparent substrate is 0.05 mm to 20 mm; the material of the transparent substrate is a rigid transparent substrate or a flexible transparent substrate; preferably, the rigid transparent substrate includes one or more of organic glass PMMA, inorganic glass, and tempered glass; the flexible transparent substrate includes one or more of transparent epoxy resin, acrylic resin, polyurethane, PP, PS, PVDC, PVA, PA, PE, PET, PC, PI, PVC, TPU, TPR, PVB, and EVA.

[0016] Preferably, the transparent protective layer is provided with an adhesive surface, and the transparent insulating encapsulation layer is adhered to the surface of the transparent protective layer.

[0017] Preferably, the liquid metal conductive layer is provided with LED lamp bead pads corresponding to the LED lamp beads, and FPC pads corresponding to the FPC; the pad solder joints of the LED lamp bead pads and the FPC pads are made of liquid metal material; preferably, the melting point of the liquid metal material is 100°C to 300°C, and the liquid metal material is selected from one or more of bismuth-based liquid metal, indium-based liquid metal, and tin-based liquid metal.

[0018] Further preferably, the transparent insulating encapsulation layer is a thermoplastic transparent resin film; preferably, the thermoplastic resin is selected from one or more of PP, PS, PVDC, PVA, PA, PE, PET, PC, PI, PVC, TPU, TPR, PVB, and EVA; the thickness of the transparent insulating encapsulation layer is 0.01 mm to 5 mm.

[0019] Preferably, the transparent protective layer is a rigid transparent protective layer or a flexible transparent protective layer.

[0020] Further preferably, when the transparent protective layer is a flexible transparent protective layer, the lower surface of the transparent protective layer 5 is provided with transparent traceless glue for bonding with the transparent insulating packaging layer; the lower surface of the transparent protective layer is preset with an LED lamp groove; the transparent protective layer is a thermoplastic transparent resin film, and the thermoplastic transparent resin film is selected from one or more of PP, PS, PVDC, PVA, PA, PE, PET, PC, PI, PVC, TPU, TPR, PVB, and EVA; the thickness of the transparent protective layer is 0.01 mm to 10 mm.

[0021] Further preferably, when the transparent protective layer is a rigid transparent protective layer, a glue strip is provided on the edge of the transparent protective layer, and the glue strip is a transparent glue strip, and the glue strip is also bonded to the transparent substrate.

[0022] In a second aspect, the present invention further provides a method for preparing the liquid metal LED display screen, comprising the following steps:

[0023] S1: preparing a liquid metal conductive layer, adhering liquid metal or liquid metal composite material to a transparent substrate by printing, printing, spraying or transfer, to obtain a fine line mesh circuit or a conductive thin layer;

[0024] S2: Making LED pads and FPC pads, placing liquid metal materials at preset solder joint positions by dot coating or printing, to obtain LED pads and FPC pads;

[0025] S3: Make a transparent insulating encapsulation layer, position the hollowed-out transparent insulating film and cover it on the liquid metal conductive layer, with the hollowed-out positions corresponding to the LED pads and FPC pads one by one, and adhere it to the liquid metal conductive layer after degassing and softening through vacuum heating;

[0026] S4: Making a transparent LED protective layer. If it is a flexible transparent protective layer, embed the LED lamp beads into the LED lamp grooves preset in the flexible transparent protective layer through a placement machine; if it is a rigid transparent protective layer, set a rubber strip for fixing the edge of the rigid transparent protective layer;

[0027] S5: Printing conductive glue, applying UV conductive glue, printing the conductive glue on the LED lamp bead pins through the screen, and using the glue dispensing machine to apply UV glue to the remaining parts of the LED lamp bead;

[0028] S6: Laminating the LED lamp beads and the transparent protective layer. If it is a flexible transparent protective layer, tear off the protective film of the adhesive layer on the surface of the flexible transparent protective layer, position the transparent substrate with the liquid metal conductive layer and the transparent insulating packaging layer and laminate it on the transparent protective layer; if it is a rigid substrate and a rigid protective layer, use the chip mounter to directly laminate the LED on the corresponding LED pad of the transparent substrate, then tear off the protective film of the transparent protective layer adhesive strip, position the transparent protective layer and the transparent substrate and laminate them;

[0029] S7: vacuum lamination and curing, wherein the air at the bonding position is removed by vacuum, and the liquid metal conductive adhesive is cured by heating at a temperature preferably between 60° C. and 150° C. to obtain a liquid metal LED display screen.

[0030] In a third aspect, the present invention further provides the application of the liquid metal LED display or the method for preparing the liquid metal LED display. When the liquid metal conductive layer is a mesh fine-wire circuit, the liquid metal LED display is applied to high-light-transmittance application scenarios. When the liquid metal conductive layer is a conductive film, the liquid metal LED display is applied to non-light-transmittance scenarios, preferably blackout curtains or curtain displays. The application of the liquid metal LED display provided by the present invention is for application scenarios requiring high light transmittance. The mesh fine-wire circuit can ensure excellent conductive performance without blocking vision and has excellent light transmittance. For non-light-transmittance scenarios such as blackout curtains and curtain displays, the liquid metal conductive thin layer can achieve full light-shielding, winding and display functions.

[0031] The liquid metal LED display screen provided by the present invention and its preparation method and application can significantly simplify the production process and equipment, and improve production efficiency and yield rate. In the present invention, the liquid metal conductive layer is prepared with liquid metal and its composite materials, due to the high conductivity and excellent printing performance of liquid metal. The conductivity and adhesion of the conductive layer are significantly improved, which significantly reduces the production cost of the display screen and solves the problem of voltage drop. In particular, the mesh circuit prepared by printing, printing, spraying, transfer, transfer, etc. significantly improves the light transmittance. For shading scenes, the flexible conductive thin layer produced can achieve full shading, curling, bending and display function integration. In addition, the optimization of the bonding method between the flexible substrate and the transparent protective layer makes maintenance more convenient. The transparent vacuum suction cup of the substrate is set, which makes installation and disassembly more convenient.

[0032] The beneficial effects of the present invention are at least:

[0033] 1. This invention uses liquid metal and its composite materials to create conductive circuits. Compared with traditional methods using ITO, silver paste, etc., the conductive circuits have stronger adhesion and significantly reduced production costs. Furthermore, the conductive circuits have better conductivity and no voltage drop. This stabilizes the voltage of each LED bead on the LED display, ensuring uniform brightness. Furthermore, through material and ratio design, a flexible conductive layer can be produced, which can adapt to transparent substrates of different materials, significantly improving the adaptability of traditional displays.

[0034] 2. The present invention abandons the traditional high-temperature sputtering and etching process for producing conductive circuits, and adopts printing, printing, spraying, transfer and other methods to produce liquid metal conductive layers, which simplifies the production process and equipment and avoids the problems of low production efficiency and yield caused by high-temperature production of conductive circuits.

[0035] 3. The present invention can produce extremely fine mesh conductive circuits, significantly improving the light transmittance of display screens. At the same time, for blackout curtains and curtain displays, a fully blackout liquid metal flexible conductive thin layer can also be produced to achieve multifunctional integration such as blackout, arbitrary curling, bending, and graphic and video display.

[0036] 4. The present invention adheres the transparent substrate and the LED protective layer by gluing, which can facilitate maintenance by technicians during production and use, and can ensure the aesthetics of the display screen after maintenance.

[0037] 5. The present invention installs a transparent vacuum suction cup on the transparent substrate, making installation and disassembly more convenient and avoiding the problem of adhesive residue and cleaning difficulty after disassembly using adhesives. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. The drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0039] Figure 1 This is a flow chart for preparing the liquid metal LED display screen provided by the present invention;

[0040] Figure 2 A cross-sectional view of the liquid metal flexible display structure provided by the present invention;

[0041] Figure 3 Schematic diagram of the transparent substrate, liquid metal conductive layer, and transparent bonding protective layer provided by the present invention;

[0042] Figure 4 A schematic diagram of a transparent protective layer embedded in LED lamp beads provided by the present invention;

[0043] Figure 5 An exploded view of the flexible liquid metal LED display provided by the present invention;

[0044] Figure 6 This is an exploded view of the rigid liquid metal LED display screen provided by the present invention;

[0045] Figure numerals: 1. transparent substrate, 2. liquid metal conductive layer, 200. LED pad, 201. FPC pad, 3. transparent insulating packaging layer, 4. LED lamp beads, 5. transparent protective layer, 501. LED lamp trough, 6. adhesive strip. DETAILED DESCRIPTION

[0046] In order to clearly describe the content of the present invention, the present invention will be described in detail below in conjunction with the examples, comparative examples and accompanying drawings. The following examples and comparative examples are used to illustrate the present invention, but are not used to limit the scope of the present invention. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] The following embodiments describe the present invention in detail. The following embodiments differ in that: Examples 1 and 2 utilize flexible transparent substrates, while Examples 3 and 4 utilize rigid transparent substrates; and the liquid metal conductive layer material in Examples 1 and 3 is gallium-based liquid metal, while the liquid metal conductive layer material in Examples 2 and 4 is a liquid metal composite material.

[0048] The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0049] In the description of the present invention, unless otherwise specified, the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0050] Example 1

[0051] This embodiment provides a liquid metal LED display screen and its preparation method and application, such as Figure 2-5 As shown, the liquid metal LED display includes: a transparent substrate 1, a liquid metal conductive layer 2 disposed on the transparent substrate 1, LED pads 200 and FPC pads 201 disposed on the conductive layer. A transparent insulating encapsulation layer 3 is disposed on the liquid metal conductive layer 2, and a transparent protective layer 5 is disposed on the transparent insulating encapsulation layer 3. The lower surface of the transparent protective layer 5 is adhesive, and the LED lamp beads 4 are partially embedded in the transparent protective layer 5.

[0052] Furthermore, a plurality of vacuum fixing suction cups are provided on one side of the transparent substrate 1 for fixing the LED display screen to the smooth glass wall surface, and a liquid metal conductive layer 2 is provided on the other side. The thickness of the transparent substrate 1 is 2 mm.

[0053] The transparent substrate 1 is made of transparent PP film.

[0054] Furthermore, the liquid metal conductive layer 2 is provided with LED pads 200 and FPC pads 201 corresponding to the LED lamp beads 4 and the FPC.

[0055] Furthermore, the liquid metal conductive layer 2 can be formed by attaching the conductive material to the transparent substrate 1 using liquid metal or liquid metal composite materials through printing, printing, spraying, transfer, etc., depending on the circuit design requirements. This forms a mesh-like fine-line circuit or conductive film. The film thickness is 100 μm, and the fine line width is between 50 μm.

[0056] The melting point of the liquid metal is in the range of 10°C. Preferably, the liquid metal is a gallium-indium-tin alloy;

[0057] Furthermore, the liquid metal conductive layer 2 is provided with an LED pad 200 and an FPC pad 201 , and the pad solder joints are made of tin-indium alloy, which has a melting point of 150°C.

[0058] Furthermore, the transparent insulating encapsulation layer 3 is a thermoplastic transparent resin film, preferably, the thermoplastic resin is a PP film. The transparent insulating encapsulation layer 3 has a thickness of 0.05 mm.

[0059] Furthermore, the transparent protective layer 5 is a flexible transparent protective layer adhered to the transparent insulating encapsulation layer 3 using a transparent, traceless adhesive on its lower surface. The lower surface of the transparent protective layer 5 is pre-defined with an LED light trough 501. Preferably, the transparent protective layer 5 is a thermoplastic transparent resin film, wherein the thermoplastic resin is a PP film. The transparent protective layer has a thickness of 3 mm.

[0060] This embodiment also provides a method for preparing a liquid metal LED display screen. Figure 1 As shown, the following steps are included:

[0061] S1: Prepare a liquid metal conductive layer 2, and adhere the gallium indium tin alloy to the transparent substrate 1 by printing to form a fine line mesh circuit.

[0062] S2: Making LED pads 200 and FPC pads 201, placing liquid metal alloy material at preset solder joint positions by spot coating to form LED pads 200 and FPC pads 201.

[0063] S3: Make a transparent insulating packaging layer 3, position the hollowed-out transparent insulating film and cover it on the liquid metal conductive layer 2, with the hollowed-out position corresponding to the LED pad 200 and the FPC pad 201 one by one. After vacuum heating and degassing and softening, it adheres to the liquid metal conductive layer 2 to complete the production of the transparent insulating packaging layer 3.

[0064] S4: Make a (LED) transparent protective layer 5, and embed the LED lamp beads 4 into the preset LED lamp groove 501 through a placement machine.

[0065] S5: Print conductive glue, apply UV conductive glue, and print the conductive glue on the pins of LED lamp bead 4 through the screen. Use a glue dispenser to apply UV glue to the remaining parts of LED lamp bead 4.

[0066] S6: The LED lamp beads 4 and the transparent protective layer 5 are laminated, the protective film of the adhesive layer on the surface of the transparent protective layer is torn off, and the transparent substrate 1 with the liquid metal conductive layer 2 and the transparent insulating packaging layer 3 is positioned and laminated on the transparent protective layer 5.

[0067] S7: Vacuum lamination and curing. The air in the bonding area is removed by vacuum, and the liquid metal conductive adhesive is heated to 130°C to cure. This completes the production of the flexible liquid metal LED display.

[0068] Furthermore, this embodiment also provides an application of a liquid metal LED display screen. For application scenarios requiring high light transmittance, the mesh fine-wire circuit can not only ensure excellent conductive performance, but also does not block the line of sight and has excellent light transmittance; for non-transparent scenes such as blackout curtains and curtain displays, the liquid metal conductive thin layer can achieve full shading, winding and display functions.

[0069] Example 2

[0070] This embodiment provides a liquid metal LED display screen, its preparation method, and application. The liquid metal LED display screen includes: a transparent substrate 1; a liquid metal conductive layer 2 disposed on the transparent substrate 1; LED pads 200 and FPC pads 201 disposed on the conductive layer. A transparent insulating encapsulation layer 3 is disposed on the liquid metal conductive layer 2; and a transparent protective layer 5 is disposed on the transparent insulating encapsulation layer 3. The lower surface of the transparent protective layer is adhesive, and LED beads 4 are partially embedded in the transparent protective layer 5.

[0071] Furthermore, a plurality of vacuum fixing suction cups are provided on one side of the transparent substrate 1 for fixing the LED display screen to the smooth glass wall surface, and a liquid metal conductive layer 2 is provided on the other side. The thickness of the transparent substrate 1 is 2 mm.

[0072] The transparent substrate 1 is made of transparent PP film.

[0073] Furthermore, the liquid metal conductive layer 2 is provided with LED pads 200 and FPC pads 201 corresponding to the LED lamp beads 4 and the FPC.

[0074] Furthermore, the liquid metal conductive layer 2 can be formed by attaching the conductive material to the transparent substrate 1 using liquid metal composite material by printing, spraying, or transfer printing, depending on the circuit design requirements. This forms a mesh-like fine-line circuit or conductive film. The film thickness is 100 μm, and the fine line width is between 50 μm.

[0075] The liquid metal composite material comprises liquid metal tin-indium alloy powder and an organic mixture in a mass ratio of 90:10. Preferably, the organic mixture comprises epoxy resin, diethylenetriamine, Q692, bentonite, DOPT, and CNBT in a mass ratio of 100:20:5:1:1:1.

[0076] Furthermore, the liquid metal conductive layer 2 is provided with an LED pad 200 and an FPC pad 201 , and the pad solder joints are made of tin-indium alloy, which has a melting point of 150°C.

[0077] Furthermore, the transparent insulating encapsulation layer 3 is a thermoplastic transparent resin film, preferably, the thermoplastic resin is a PP film. The transparent insulating encapsulation layer 3 has a thickness of 0.05 mm.

[0078] Furthermore, the transparent protective layer 5 is a flexible transparent protective layer adhered to the transparent insulating encapsulation layer 3 using transparent, traceless adhesive on its lower surface. The lower surface of the transparent protective layer 5 is pre-determined with an LED light trough 501. Preferably, the transparent protective layer 5 is a thermoplastic transparent resin film, wherein the thermoplastic resin is PP film. The transparent protective layer has a thickness of 3 mm.

[0079] This embodiment also provides a method for preparing a liquid metal LED display screen. Figure 1 As shown, the following steps are included:

[0080] S1: Prepare a liquid metal conductive layer 2, and adhere the liquid metal composite material to the transparent substrate 1 by printing to form a conductive thin layer.

[0081] S2: Make LED pad 200 and FPC pad 201, and set liquid metal material at the preset soldering point position by spot coating or other methods to form LED pad 200 and FPC pad 201.

[0082] S3: Make a transparent insulating packaging layer 3, position the hollowed-out transparent insulating film and cover it on the liquid metal conductive layer 2, with the hollowed-out position corresponding to the LED pad 200 and the FPC pad 201 one by one. After vacuum heating and degassing and softening, it adheres to the liquid metal conductive layer 2 to complete the production of the transparent insulating packaging layer 3.

[0083] S4: Make the LED transparent protective layer 5 and embed the LED lamp beads 4 into the preset LED lamp trough 501 through a placement machine.

[0084] S5: Print conductive glue, apply UV conductive glue, and print the conductive glue on the pins of LED lamp bead 4 through the screen. Use a glue dispenser to apply UV glue to the remaining parts of LED lamp bead 4.

[0085] S6: The LED lamp beads 4 and the transparent protective layer 5 are laminated, the protective film of the adhesive layer on the surface of the transparent protective layer is torn off, and the transparent substrate 1 with the liquid metal conductive layer 2 and the transparent insulating packaging layer 3 is positioned and laminated on the transparent protective layer 5.

[0086] S7: Vacuum lamination and curing. The air in the bonding area is removed by vacuum, and the liquid metal conductive adhesive is heated to 130°C to cure. This completes the production of the flexible liquid metal LED display.

[0087] Furthermore, this embodiment also provides an application of a liquid metal LED display screen. For application scenarios requiring high light transmittance, the mesh fine-wire circuit can not only ensure excellent conductive performance, but also does not block the line of sight and has excellent light transmittance; for non-transparent scenes such as blackout curtains and curtain displays, the liquid metal conductive thin layer can achieve full shading, winding and display functions.

[0088] Example 3

[0089] This embodiment provides a liquid metal LED display screen and its preparation method and application, such as Figure 6 The liquid metal LED display includes a transparent substrate 1, a liquid metal conductive layer 2 disposed on the transparent substrate 1, LED pads 200 and FPC pads 201 disposed on the conductive layer. A transparent insulating encapsulation layer 3 is disposed on the liquid metal conductive layer 2, and a transparent protective layer 5 is disposed on the transparent insulating encapsulation layer 3. The lower surface of the transparent protective layer is adhesive, and LED lamp beads 4 are partially embedded in the transparent protective layer 5.

[0090] Furthermore, a plurality of vacuum fixing suction cups are provided on one side of the transparent substrate 1 for fixing the LED display screen to the smooth glass wall surface, and a liquid metal conductive layer 2 is provided on the other side. The thickness of the transparent substrate 1 is 2 mm.

[0091] The transparent substrate 1 is made of transparent tempered glass.

[0092] Furthermore, the liquid metal conductive layer 2 is provided with LED pads 200 and FPC pads 201 corresponding to the LED lamp beads 4 and the FPC.

[0093] Furthermore, the liquid metal conductive layer 2 can be formed by attaching the conductive material to the transparent substrate 1 by printing, spraying, or transferring liquid metal as raw material, depending on the circuit design requirements. This forms a mesh-like fine-line circuit or conductive film. The film thickness is 100 μm, and the fine line width is between 50 μm.

[0094] The melting point of the liquid metal is in the range of 10°C. Preferably, the liquid metal is a gallium-indium-tin alloy;

[0095] Furthermore, the liquid metal conductive layer 2 is provided with an LED pad 200 and an FPC pad 201 , and the pad solder joints are made of tin-indium alloy, which has a melting point of 150°C.

[0096] Furthermore, the transparent insulating encapsulation layer 3 is a thermoplastic transparent resin film, preferably, the thermoplastic resin is a PP film. The transparent insulating encapsulation layer 3 has a thickness of 0.05 mm.

[0097] Furthermore, the transparent protective layer 5 is a rigid transparent protective layer, fixed to the transparent insulating packaging layer 3 by a rubber strip 6 on the edge of the lower surface. Preferably, the transparent protective layer 5 is made of transparent tempered glass, and the thickness of the transparent protective layer is 5 mm.

[0098] This embodiment also provides a method for preparing a liquid metal LED display screen. Figure 1 As shown, the following steps are included:

[0099] S1: Prepare a liquid metal conductive layer 2, and adhere the gallium indium tin alloy to the transparent substrate 1 by printing to form a fine line mesh circuit.

[0100] S2: Making LED pads 200 and FPC pads 201, placing liquid metal alloy material at preset solder joint positions by spot coating to form LED pads 200 and FPC pads 201.

[0101] S3: Make a transparent insulating packaging layer 3, position the hollowed-out transparent insulating film and cover it on the liquid metal conductive layer 2, with the hollowed-out position corresponding to the LED pad 200 and the FPC pad 201 one by one. After vacuum heating and degassing and softening, it adheres to the liquid metal conductive layer 2 to complete the production of the transparent insulating packaging layer 3.

[0102] S4: Make a rigid transparent protective layer for LEDs, and set a rubber strip 6 for fixing on the edge of the rigid protective layer.

[0103] S5: Print conductive glue, apply UV conductive glue, and print the conductive glue on the pins of LED lamp bead 4 through the screen. Use a glue dispenser to apply UV glue to the remaining parts of LED lamp bead 4.

[0104] S6: LED lamp beads 4, rigid transparent protective layer bonding, use the placement machine to directly bond the LED to the LED pad corresponding to the rigid transparent substrate, tear off the protective film of the adhesive strip, and position the rigid transparent protective layer and the transparent substrate and bond them together.

[0105] S7: Vacuum lamination and curing. The air in the bonding area is removed by vacuum, and the liquid metal conductive adhesive is heated to 130°C to cure. This completes the production of the flexible liquid metal LED display.

[0106] This embodiment also provides an application of a liquid metal LED display screen. For application scenarios requiring high light transmittance, the mesh fine-wire circuit can ensure excellent conductivity without blocking vision and has excellent light transmittance. For non-transparent scenes such as blackout curtains and curtain displays, the liquid metal conductive thin layer can achieve full shading, winding and display functions.

[0107] Example 4

[0108] This embodiment provides a liquid metal LED display screen, its preparation method, and application, comprising: a transparent substrate 1, a liquid metal conductive layer 2 disposed on the transparent substrate 1, LED pads 200 disposed on the conductive layer, and FPC pads 201. A transparent insulating encapsulation layer 3 is disposed on the liquid metal conductive layer 2, and a transparent protective layer 5 is disposed on the transparent insulating encapsulation layer 3. The lower surface of the transparent protective layer 5 is adhesive, and LED lamp beads 4 are partially embedded in the transparent protective layer 5.

[0109] Furthermore, a plurality of vacuum fixing suction cups are provided on one side of the transparent substrate 1 for fixing the LED display screen to the smooth glass wall surface, and a liquid metal conductive layer 2 is provided on the other side. The thickness of the transparent substrate 1 is 2 mm.

[0110] The transparent substrate 1 is made of transparent tempered glass.

[0111] Furthermore, the liquid metal conductive layer 2 is provided with LED pads 200 and FPC pads 201 corresponding to the LED lamp beads 4 and the FPC.

[0112] Furthermore, the liquid metal conductive layer 2 can be formed by attaching the conductive material to the transparent substrate 1 using liquid metal composite material by printing, spraying, or transfer printing, depending on the circuit design requirements. This forms a mesh-like fine-line circuit or conductive film. The film thickness is 100 μm, and the fine line width is between 50 μm.

[0113] The liquid metal composite material comprises liquid metal tin-indium alloy powder and an organic mixture in a mass ratio of 90:10. Preferably, the organic mixture comprises epoxy resin, diethylenetriamine, Q692, bentonite, DOPT, and CNBT in a mass ratio of 100:20:5:1:1:1.

[0114] Furthermore, the liquid metal conductive layer 2 is provided with an LED pad 200 and an FPC pad 201 , and the pad solder joints are made of tin-indium alloy, which has a melting point of 150°C.

[0115] Furthermore, the transparent insulating encapsulation layer 3 is a thermoplastic transparent resin film, preferably, the thermoplastic resin is a PP film. The transparent insulating encapsulation layer 3 has a thickness of 0.05 mm.

[0116] Furthermore, the transparent protective layer 5 is a rigid transparent protective layer, fixed to the transparent insulating packaging layer 3 by a rubber strip 6 on the edge of the lower surface. Preferably, the transparent protective layer 5 is made of transparent tempered glass, and the thickness of the transparent protective layer is 5 mm.

[0117] This embodiment also provides a method for preparing a liquid metal LED display screen. Figure 1 As shown, the following steps are included:

[0118] S1: Prepare a liquid metal conductive layer 2, and adhere the gallium indium tin alloy to the transparent substrate 1 by printing to form a fine line mesh circuit.

[0119] S2: Making LED pads 200 and FPC pads 201, placing liquid metal alloy material at preset solder joint positions by spot coating to form LED pads 200 and FPC pads 201.

[0120] S3: Make a transparent insulating packaging layer 3, position the hollowed-out transparent insulating film and cover it on the liquid metal conductive layer 2, with the hollowed-out position corresponding to the LED pad 200 and the FPC pad 201 one by one. After vacuum heating and degassing and softening, it adheres to the liquid metal conductive layer 2 to complete the production of the transparent insulating packaging layer 3.

[0121] S4: Make a rigid transparent protective layer for LEDs, and set a rubber strip 6 for fixing on the edge of the rigid protective layer.

[0122] S5: Print conductive glue, apply UV conductive glue, and print the conductive glue on the pins of LED lamp bead 4 through the screen. Use a glue dispenser to apply UV glue to the remaining parts of LED lamp bead 4.

[0123] S6: LED lamp beads 4, rigid transparent protective layer bonding, use the placement machine to directly bond the LED to the LED pad corresponding to the rigid transparent substrate, tear off the protective film of the adhesive strip, and position the rigid transparent protective layer and the transparent substrate and bond them together.

[0124] S7: Vacuum lamination and curing. The air in the bonding area is removed by vacuum, and the liquid metal conductive adhesive is heated to 130°C to cure. This completes the production of the flexible liquid metal LED display.

[0125] This embodiment also provides an application of a liquid metal LED display screen. For application scenarios requiring high light transmittance, the mesh fine-wire circuit can ensure excellent conductivity without blocking vision and has excellent light transmittance. For non-transparent scenes such as blackout curtains and curtain displays, the liquid metal conductive thin layer can achieve full shading, winding and display functions.

[0126] Table 1 Effect data of Examples 1-4

[0127]

[0128] Although the present invention has been described in detail above using general explanations, specific embodiments, and experiments, it will be apparent to those skilled in the art that modifications and improvements may be made based on the present invention. Therefore, such modifications and improvements, which do not depart from the spirit of the present invention, are intended to be within the scope of protection claimed herein.

Claims

1. A liquid metal LED display, characterized in that: include: A transparent substrate, a liquid metal conductive layer arranged on the transparent substrate, a transparent insulating encapsulation layer arranged on the liquid metal conductive layer, a transparent protective layer arranged on the transparent insulating encapsulation layer, and LED lamp beads embedded in the transparent protective layer, wherein the liquid metal conductive layer is a mesh fine line circuit or a conductive film; the film thickness of the liquid metal conductive layer is 0.5μm~250μm; the fine line width of the liquid metal conductive layer is 1μm~200μm; the raw material of the liquid metal conductive layer is liquid metal or liquid metal composite material; The melting point of the liquid metal is -40°C to 300°C; the liquid metal includes one or more of gallium-based liquid metal, bismuth-based liquid metal, indium-based liquid metal, and tin-based liquid metal; the liquid metal composite material is a mixture of liquid metal powder and an organic mixture in a mass ratio of (50-90):(10-50); the organic mixture is a mixture of a matrix resin, a curing agent, a diluent, a thickener, a plasticizer, and a toughening agent in a mass ratio of 100:(10-20):(1-10):(1-3):(1-2):(1-2).

2. The liquid metal LED display according to claim 1, characterized in that: At least one vacuum fixing suction cup is provided on one side of the transparent substrate, and the vacuum fixing suction cup is used to fix the liquid metal LED display screen; the liquid metal conductive layer is provided on the other side of the transparent substrate.

3. The liquid metal LED display screen according to claim 1, characterized in that: The thickness of the transparent substrate is 0.05mm~20mm; the material of the transparent substrate is a rigid transparent substrate or a flexible transparent substrate; the rigid transparent substrate includes one or more of organic glass PMMA and inorganic glass; the flexible transparent substrate includes one or more of transparent epoxy resin, polyurethane, PP, PS, PVDC, PVA, PA, PE, PET, PC, PI, PVC, TPU, TPR, PVB, and EVA.

4. The liquid metal LED display according to claim 1, characterized in that: The liquid metal conductive layer is formed by adhering the raw materials to the transparent substrate by printing, printing, spraying or transferring according to the designed circuit.

5. The liquid metal LED display screen according to claim 1, characterized in that: The transparent protective layer is provided with a surface having adhesiveness, and the transparent insulating encapsulation layer is adhered to the surface of the transparent protective layer.

6. The liquid metal LED display screen according to claim 1, characterized in that: The liquid metal conductive layer is provided with LED lamp bead pads corresponding to the LED lamp beads, and FPC pads corresponding to the FPC; the pad solder joints of the LED lamp bead pads and the FPC pads are made of liquid metal material, the melting point of the liquid metal material is 100°C~300°C, and the liquid metal material is selected from one or more of bismuth-based liquid metal, indium-based liquid metal, and tin-based liquid metal.

7. The liquid metal LED display according to any one of claims 1 to 6, characterized in that: The transparent insulating encapsulation layer is a thermoplastic transparent resin film; the thermoplastic transparent resin film is selected from one or more of PP, PS, PVDC, PVA, PA, PE, PET, PC, PI, PVC, TPU, TPR, PVB, and EVA; the thickness of the transparent insulating encapsulation layer is 0.01 mm to 5 mm.

8. The liquid metal LED display according to any one of claims 1 to 6, characterized in that: The transparent protective layer is a rigid transparent protective layer or a flexible transparent protective layer; When the transparent protective layer is a flexible transparent protective layer, a transparent traceless adhesive is provided on the lower surface of the transparent protective layer for bonding with the transparent insulating packaging layer; an LED light groove is preset on the lower surface of the transparent protective layer; the transparent protective layer is a thermoplastic transparent resin film, and the thermoplastic transparent resin film is selected from one or more of PP, PS, PVDC, PVA, PA, PE, PET, PC, PI, PVC, TPU, TPR, PVB, and EVA; the thickness of the transparent protective layer is 0.01 mm to 10 mm; When the transparent protective layer is a rigid transparent protective layer, a glue strip is provided at the edge of the transparent protective layer. The glue strip is a transparent glue strip and is also bonded to the transparent substrate.

9. The method for preparing the liquid metal LED display according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: preparing a liquid metal conductive layer, adhering liquid metal or liquid metal composite material to a transparent substrate by printing, printing, spraying or transfer, to obtain a fine line mesh circuit or a conductive thin layer; S2: Making LED pads and FPC pads, placing liquid metal materials at preset solder joint positions by dot coating or printing, to obtain LED pads and FPC pads; S3: Make a transparent insulating encapsulation layer, position the hollowed-out transparent insulating film and cover it on the liquid metal conductive layer, with the hollowed-out positions corresponding to the LED pads and FPC pads one by one, and adhere it to the liquid metal conductive layer after degassing and softening through vacuum heating; S4: Make a transparent LED protective layer. When it is a flexible transparent protective layer, embed the LED lamp beads into the preset LED lamp grooves in the flexible transparent protective layer through a placement machine; When it is a rigid transparent protective layer, a rubber strip for fixing is provided on the edge of the rigid transparent protective layer; S5: Printing conductive glue, applying UV conductive glue, printing the conductive glue on the LED lamp bead pins through the screen, and using the glue dispensing machine to apply UV glue to the remaining parts of the LED lamp bead; S6: Laminating the LED lamp beads and the transparent protective layer. If it is a flexible transparent protective layer, tear off the protective film of the adhesive layer on the surface of the flexible transparent protective layer, position the transparent substrate with the liquid metal conductive layer and the transparent insulating packaging layer and laminate it on the transparent protective layer; if it is a rigid substrate and a rigid protective layer, use the chip mounter to directly laminate the LED on the corresponding LED pad of the transparent substrate, then tear off the protective film of the transparent protective layer adhesive strip, position the transparent protective layer and the transparent substrate and laminate them; S7: Vacuum lamination and curing: remove the air from the bonding area by vacuum, and heat at a temperature of 60℃~150℃ to cure the liquid metal conductive adhesive to obtain a liquid metal LED display.

10. Use of the liquid metal LED display screen according to any one of claims 1 to 8 or the liquid metal LED display screen prepared by the preparation method according to claim 9, characterized in that: When the liquid metal conductive layer is a mesh fine-line circuit, the liquid metal LED display is used in high-light-transmittance application scenarios. When the liquid metal conductive layer is a conductive film, the liquid metal LED display is used in opaque scenarios.

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