WO2021238450A1 - 柔性显示装置 - Google Patents

柔性显示装置 Download PDF

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Publication number
WO2021238450A1
WO2021238450A1 PCT/CN2021/086289 CN2021086289W WO2021238450A1 WO 2021238450 A1 WO2021238450 A1 WO 2021238450A1 CN 2021086289 W CN2021086289 W CN 2021086289W WO 2021238450 A1 WO2021238450 A1 WO 2021238450A1
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WO
WIPO (PCT)
Prior art keywords
heat
heat dissipation
heat sink
flexible display
display device
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2021/086289
Other languages
English (en)
French (fr)
Chinese (zh)
Inventor
王浩然
刘小林
朱红
张雄南
张子予
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Original Assignee
BOE Technology Group 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 BOE Technology Group Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to JP2021568596A priority Critical patent/JP7748286B2/ja
Priority to EP21810268.9A priority patent/EP3993138B1/en
Priority to US17/435,124 priority patent/US12015133B2/en
Publication of WO2021238450A1 publication Critical patent/WO2021238450A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1635—Details related to the integration of battery packs and other power supplies such as fuel cells or integrated AC adapter
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1641—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being formed by a plurality of foldable display components
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1652—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being flexible, e.g. mimicking a sheet of paper, or rollable
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/20—Cooling means
    • G06F1/203—Cooling means for portable computers, e.g. for laptops
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/623—Portable devices, e.g. mobile telephones, cameras or pacemakers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • H01M50/136—Flexibility or foldability
    • 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
    • H10K50/80—Constructional details
    • H10K50/87—Arrangements for heating or cooling
    • 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
    • H10K59/8794—Arrangements for heating and cooling
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
    • H10K77/10—Substrates, e.g. flexible substrates
    • H10K77/111—Flexible substrates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/311—Flexible OLED
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present disclosure relates to the field of display technology, and in particular, to a flexible display device.
  • the purpose of the present disclosure is to provide a flexible display device to solve one or more problems in the prior art.
  • a flexible display device including:
  • the flexible battery is arranged on the side of the flexible display panel away from the light-emitting surface;
  • a heat dissipation assembly includes a first heat dissipation fin, the first heat dissipation fin is disposed on any side of the flexible battery facing or away from the flexible display panel, and the first heat dissipation fin has a bendable area.
  • the bendable area of the first heat sink has a through structure in the thickness direction.
  • the first heat sink is a one-piece structure, and the bendable area of the first heat sink includes a plurality of patterned openings, and the openings constitute all Narrated through structure.
  • the bendable area of the first heat sink includes a plurality of heat sink bars arranged in parallel, and any two adjacent heat sink bars have an interval, and the interval
  • the through structure is constituted.
  • the first heat sink further includes a plurality of connecting pieces, the connecting pieces connect two adjacent heat sinks, and the connecting piece is connected to the two adjacent heat sinks.
  • the strips are pivotally connected, so that two adjacent heat dissipation strips can rotate relative to the connecting piece.
  • At least one long side of the heat dissipation bar is provided with at least one first protrusion facing the adjacent heat dissipation bar.
  • a second protrusion is provided on the long side of the heat dissipation bar at a position corresponding to the first protrusion of the adjacent heat dissipation bar, and the second protrusion is
  • the protruding portion has a notch that matches the shape of the first protruding portion, so that the notch and the first protruding portion can be attached to each other.
  • the first heat dissipation fin further includes a heat dissipation pipe, and the heat dissipation pipe is connected to each of the heat dissipation bars.
  • the first heat sink further includes a base layer, the heat sink is bonded to one side of the base layer, and the other side of the base layer is bonded to the flexible Battery or the flexible display panel.
  • the width L of the heat dissipation bar satisfies 0.05mm ⁇ L ⁇ 20mm
  • the width h of the interval between two adjacent heat dissipation bars satisfies 0.1mm ⁇ h ⁇ 10mm.
  • a through hole is opened on the heat dissipation bar.
  • the material of the first heat sink is metal.
  • the heat dissipation assembly further includes a second heat dissipation fin, and the second heat dissipation fin is provided on the other side of the flexible battery facing or away from the flexible display panel.
  • the second heat sink has a bendable area, and the bendable area of the second heat sink corresponds to the bendable area of the heat insulation layer and the bendable area of the first heat sink.
  • the structure of the second heat sink is the same as or different from that of the first heat sink, and the material of the second heat sink is the same as that of the first heat sink. Same or different.
  • the heat dissipation assembly further includes a heat insulation layer provided between the heat dissipation sheet close to the flexible display panel and the flexible display panel.
  • the thermal layer has a bendable area, and the bendable area of the heat insulation layer corresponds to the bendable area of the first heat sink.
  • the material of the heat insulation layer is rubber, silica gel, porous material, polyurethane, acrylic, or an organic film layer containing a metal coating.
  • the thickness of the first heat sink, the heat insulation layer, and the second heat sink does not exceed 1 mm.
  • the heat dissipating assembly further includes a heat conducting member, the heat conducting member is provided between the first heat sink and the second heat sink and connects the first heat sink and the second heat sink.
  • the heat-conducting element is located on at least one side of the flexible battery and is spaced apart from the flexible battery.
  • the flexible display device further includes a heat dissipation unit connected to at least one of the first heat dissipation fin, the second heat dissipation fin, or the heat conducting member.
  • the flexible battery includes a flexible casing and a positive electrode, a negative electrode, an electrolyte, an insulating layer, a positive electrode current collector, and a negative electrode current collector provided in the flexible housing. It is arranged opposite to the negative electrode, the insulating layer is located between the positive electrode and the negative electrode, the positive electrode current collector is located on the side of the positive electrode away from the insulating layer, and the negative electrode current collector is located on the side of the negative electrode away from the insulating layer.
  • the electrolyte is distributed between the positive electrode and the negative electrode.
  • the flexible display device of the present disclosure includes a flexible display panel, a flexible battery, and a heat dissipation component.
  • the heat dissipation component is arranged between the flexible display panel and the flexible battery and has a bendable area, thereby not only realizing the flexibility of the entire display device, but also solving The heat dissipation problem of the flexible battery is avoided, the battery heat is prevented from affecting the display panel, and the battery heat can be uniformized from time to time, and the performance deterioration caused by the partial overheating of the battery is prevented.
  • FIG. 1 is a schematic diagram of the structure of a flexible battery in this embodiment
  • FIG. 2 is a schematic diagram of the structure of the flexible display panel of the embodiment
  • FIG. 3 is a schematic diagram of the structure of the heat dissipation assembly of the first embodiment
  • FIG. 4 is a schematic diagram of the first patterned opening when the first heat sink has a monolithic structure
  • FIG. 5 is a schematic diagram of the second type of patterned openings when the first heat sink has a monolithic structure
  • FIG. 6 is a schematic diagram of a third type of patterned opening when the first heat sink has a monolithic structure
  • FIG. 7 is a schematic diagram of the structure of the first heat sink including the heat sink
  • Figure 8 is a schematic diagram of the bonding structure of the heat sink
  • FIG. 9 is a schematic diagram of the structure of the heat dissipation bar including the first protruding portion
  • Fig. 10 is a schematic diagram of various shapes of the first protrusion
  • FIG. 11 is a schematic diagram of the structure of the heat dissipation bar including a first protrusion and a second protrusion;
  • FIG. 12 is a schematic diagram of a structure in which the first heat sink includes a heat pipe
  • Figure 13 is a schematic view of the structure of the heat sink connected by a connecting piece
  • Figure 14 is a schematic view of the structure of the heat sink connected by another connector
  • FIG. 15 is a schematic diagram of a structure in which through holes are provided on the heat sink.
  • FIG. 16 is a schematic structural diagram of a non-bending area provided on the first heat sink
  • FIG. 17 is a schematic diagram of the structure of the heat dissipation assembly of the second embodiment.
  • FIG. 18 is a schematic diagram of the structure of the heat dissipation assembly of the third embodiment.
  • FIG. 19 is a schematic diagram of the structure of the heat dissipation assembly of the fourth embodiment.
  • a flexible display device which includes a flexible display panel, a flexible battery, and a heat dissipation component.
  • the flexible display panel is arranged on a side of the flexible display panel away from the light-emitting surface.
  • the sheet faces or faces away from either side of the flexible display panel, and the first heat sink has a bendable area.
  • the display panel, the battery, and the first heat sink of the present disclosure all adopt a flexible structure, and each component can be bent or folded, realizing the flexibility of the whole machine.
  • the first heat sink is located on either side of the flexible battery, which can absorb the heat generated by the flexible battery, reduce the battery temperature, and make the battery temperature uniform To avoid adverse effects on the display panel.
  • the basic structure of the flexible battery of the embodiment of the present disclosure is shown in FIG. Among them, the positive electrode 22 and the negative electrode 23 are arranged oppositely, and the separator 26 is arranged between the positive electrode 22 and the negative electrode 23 to isolate the positive electrode 22 and the negative electrode 23 to avoid direct contact between the active materials on the two electrodes and cause a short circuit inside the battery 2.
  • the positive electrode current collector 24 is in contact with the positive electrode 22 and is used to transmit the current of the positive electrode 22 to the external circuit;
  • the negative electrode current collector 25 is in contact with the negative electrode 23 and is used to transmit the current of the external circuit to the negative electrode 23.
  • the electrolyte is omitted in the figure, those skilled in the art know that the electrolyte should be distributed between the positive electrode 22 and the negative electrode 23 in order to transfer ions.
  • the charging process of the flexible battery 2 is: the lithium ions generated by the positive electrode 22 enter the electrolyte from the positive electrode 22, then enter the electrolyte through the micropores on the diaphragm 26, and finally move to the negative electrode 23, and the negative electrode 23.
  • the electrons are combined together.
  • the discharge process is as follows: during discharge, electrons move from the negative electrode 23 to the positive electrode 22 through the external circuit, and lithium ions enter the electrolyte from the negative electrode 23, then enter the electrolyte through the micropores on the diaphragm 26, and finally move to the positive electrode 22, and the positive electrode 22. 22 electrons are combined together.
  • the positive electrode 22 can be flexible by arranging patterned openings 10 on the solid positive electrode 22, and the openings 10 are used to buffer the strain generated during bending and twisting.
  • the material of the positive electrode 22 differs according to the type of the flexible battery 2, for example, lithium cobalt oxide, lithium manganate, lithium iron phosphate and the like used in the lithium battery 2.
  • the material of the negative electrode 23 can be graphite powder or graphene, which is easier to achieve flexibility, and it can also be achieved by providing patterned openings 10 on the negative electrode 23 sheet.
  • the diaphragm 26 may be a polymer film, and may have a single-layer structure or a multilayer structure.
  • polymer film materials such as polyethylene, polypropylene, etc.
  • polyethylene, polypropylene, etc. can be used.
  • a composite double-layer structure such as polypropylene/polyethylene or, for example, polypropylene/polyethylene/polypropylene, can be used.
  • Such materials are flexible and can be made flexible.
  • the positive electrode current collector 24 and the negative electrode current collector 25 can use conventional metal current collector materials, such as copper, aluminum, stainless steel, etc., or use graphene-based conductive films and other higher conductivity materials, and use this film as a current collector to assemble flexible batteries. 2.
  • the flexible housing 21 can be made of materials such as aluminum plastic film or copper plastic film provided with conventional or patterned openings 10, and can also be a flexible polymer material. Most of the electrolyte is liquid or gel-like, which is inherently flexible; solid electrolytes can also be used.
  • openings 10 provided for the internal components of the flexible battery for bending and folding should correspond.
  • the basic structure of the flexible display panel of this embodiment is shown in FIG. 2.
  • the display panel includes a substrate 11 on which a driving transistor and a driving circuit (not shown in the figure) are provided.
  • the substrate 11 needs to use a flexible material, and the flexible material may be a polymer material, such as polyethylene (PE), polypropylene (PP), polyimide (PI), polyethylene terephthalate Ester (PET), polyethylene naphthalate (PEN), etc.
  • the flexible substrate 11 is also provided with a patterned opening 10 structure to relieve the stress of curling and bending.
  • One side of the substrate 11 is provided with a pixel defining layer 12 for defining the opening area of each sub-pixel, and each opening area is provided with a light-emitting device.
  • the light-emitting device may be an organic electroluminescence device, specifically including an anode layer 13, an organic Film layers such as the luminescent material layer 14 and the cathode layer 15 can of course further include a hole transport layer, an electron transport layer, an electron injection layer, a hole injection layer and other film layers. This application does not specifically limit this.
  • the display panel 1 may further include an encapsulation layer, and the encapsulation layer may be encapsulated by a film to achieve flexibility.
  • the first heat sink 3 is located between the flexible display panel 1 and the flexible battery 2, and the first heat sink 3 is disposed on one side of the battery 2 for absorbing
  • the heat radiated from the side of the flexible battery 2 toward the display panel 1 reduces the temperature of the battery 2 and prevents the local temperature of the battery 2 from being too high, so as to avoid affecting the display panel 1.
  • the first heat sink 3 has a bendable area, so as to cooperate with the whole device to achieve curling or bending.
  • the material of the first heat sink 3 may also be an organic material with high thermal conductivity such as graphene.
  • graphene when graphene is selected for the first heat sink 3, since the graphene itself has high flexibility and can be curled or bent, it can be a whole piece structure, and the whole can be regarded as a bendable area.
  • a thinner graphene heat sink can achieve good thermal conductivity, and the overall thickness of the display device can be controlled within an ideal range.
  • the first heat sink 3 made of graphene material can be fixed to the display panel 1 and the battery 2 by bonding.
  • the material of the first heat sink 3 may also be a metal material, such as silver, copper, aluminum, gold, iron, tin, etc., or an alloy material of the foregoing metals.
  • the above-mentioned metal materials can not only play a role in heat dissipation, but also play a better supporting role in the flexible display panel, thereby improving the anti-extrusion ability of the flexible display panel. Due to the strong rigidity of metal materials, in order to achieve ideal bending performance, it is necessary to form a through structure in the thickness direction in the bendable area of the material to release the stress during bending of the material and improve the bending performance. At the same time, it can meet the requirements of lightweight design.
  • the through structure can have many forms.
  • the first heat sink 3 is a one-piece structure, and the bendable area of the first heat sink 3 is provided with patterned openings 10, that is, a through structure opening on the first heat sink 3 is formed.
  • the hole 10 can buffer the stress received when the heat sink is bent. It can be understood that the bendable area of the first heat dissipation sheet 3 should correspond to the bendable area of the flexible display panel 1 or the flexible battery 2.
  • the patterned openings 10 may be as shown in FIGS. 4-6. In the first structure shown in FIG. 4, the patterned openings 10 are hexagons arranged in an array; in the first structure shown in FIG. In the two structures, the patterned openings 10 are circles arranged in an array; in the third structure shown in FIG.
  • the patterned openings 10 are rectangles with semicircular ends arranged in an array.
  • the third structure is the preferred structure, and the opening form has a better stress dispersion effect and better bendability.
  • the first heat sink 3 made of a whole piece of metal material can be fixed to the display panel 1 and the battery 2 by mechanical connection, such as clamping, riveting, etc., or it can be connected to the display panel 1 and the battery 2 by means of tape, glue, etc. Glue together.
  • the first heat sink 3 may not be a one-piece structure.
  • the first heat sink 3 includes a plurality of heat sink bars 31 arranged in parallel, and there is an interval between any two adjacent heat sink bars 31, and the interval forms a through structure on the first heat sink 3. Due to the spacing, the adjacent heat dissipation strips 31 can be folded relative to each other, so that the entire first heat dissipation fin 3 is bendable as a whole.
  • the first heat dissipation fin 3 of this structure is The bending effect is better, and the stress influence of the metal parts on the flexible display module can be further reduced, and the reliability of the display panel's flexibility is higher.
  • the heat sink 31 and its interval are at least located in the bendable area of the first heat sink 3.
  • the structure of the heat sink may also be provided in the non-bending area to dissipate the heat of the flexible battery or to support the display panel.
  • the arrangement direction of the heat dissipation strips 31 should be consistent with the bending direction to achieve bending. It should be noted that the parallel arrangement of the multiple heat dissipation bars described in this application allows the actual product angle error due to process accuracy and other reasons to exist.
  • the heat dissipation strip 31 can be bonded to a base layer 37 first, and then the base layer 37 is bonded to the flexible display panel or the flexible battery. Of course, it can also be fixed on the flexible battery or flexible display panel by mechanical connection, such as clamping, riveting, etc.
  • the heat dissipation strip 31 may be pasted on the base layer by bonding, the heat dissipation strip 31 may be displaced in the bending direction (ie, the width direction) during multiple bending processes, resulting in uniform heat conduction of the first heat sink. And the supporting capacity is reduced.
  • At least one first protrusion 301 facing the adjacent heat dissipation bar 31 is provided on at least one long side of the heat dissipation bar 31.
  • the first protrusion 301 can abut on the adjacent heat sink 31 to limit itself or the adjacent heat sink 31, so that a fixed interval is always maintained between the two to avoid displacement due to displacement. The change is too large, resulting in a decrease in the uniformity of heat conduction and the supporting capacity.
  • the first protruding portion 301 may be provided on only one long side of the heat dissipation bar 31 or may be provided on two long sides of the heat dissipation bar 31.
  • the number of the first protrusion 301 on each heat sink 31 can be one or more.
  • the positions of the first protrusions 301 on two adjacent heat dissipation bars 31 may or may not correspond to each other.
  • a plurality of heat dissipation strips 31 are arranged horizontally and spaced apart, and a first rightward protrusion 301 is provided on the right side of each heat dissipation strip 31, and each first protrusion The part 301 is located on the same horizontal line.
  • two upper and lower rightward first protrusions 301 are provided on the right side of each heat sink 31, and the upper first protrusions 301 are located on the same horizontal line.
  • the lower first protrusions 301 are located on the same horizontal line.
  • each heat dissipation strip 31 is provided with a leftward first protruding portion 301, and the right side is provided with a rightward first protruding portion 301, each The first protrusions 301 are located on the same horizontal line. Therefore, the first protrusions 301 of two adjacent heat dissipation bars 31 are arranged oppositely.
  • the left and right sides of each heat sink 31 are provided with two upper and lower first protrusions 301, and the upper first protrusions 301 are located on the same horizontal line.
  • the first protrusions 301 located below are located on the same horizontal line.
  • each heat dissipation strip 31 is provided with a leftward first protruding portion 301, and the right side is provided with a rightward first protruding portion 301, each The first protrusions 301 to the left are located on a horizontal line, and the first protrusions 301 to the right are located on another horizontal line. Therefore, the first protrusions 301 of two adjacent heat dissipation bars 31 are staggered up and down.
  • the left and right sides of each heat sink 31 are each provided with two upper and lower first protrusions 301, and each heat sink 31 has four first protrusions. Staggered around 301.
  • each heat sink 31 is each provided with three upper, middle and lower first protrusions 301, and the first protrusions 301 of each heat sink 31 are distributed On three horizontal lines.
  • the plurality of heat dissipation bars 31 can be arranged in multiple groups in the longitudinal direction of the figure.
  • the shape of the first protrusion 301 in the above-mentioned specific embodiments is all semicircular as an example. It is understandable that the shape of the first protrusion 301 can also be any other shape, such as shown in (a) in FIG. 10 The rectangle shown in Figure 10 (b) shows the trapezoid.
  • the long side of the heat dissipation bar 31 is further provided with a second protrusion 302 at a position corresponding to the first protrusion 301 of the adjacent heat dissipation bar 31.
  • the two protrusions 302 have a notch 3021, and the notch 3021 matches the shape of the first protrusion 301, so that when the two heat dissipation bars 31 are displaced, the notch 3021 and the first protrusion 301 can be engaged to prevent the heat dissipation bars 31 Move further.
  • the notch 3021 can enclose the first protrusion 301, and can also prevent the heat dissipation strip 31 from moving in the longitudinal direction in the figure, that is, it can limit the heat dissipation strip 31 in both the horizontal and vertical directions. Better results.
  • the shapes of the first protrusion 301 and the notch 3021 are both trapezoidal.
  • the shapes of the first protrusion 301 and the notch 3021 are both semi-elliptical.
  • the shape of the second protrusion 302 includes but is not limited to the rectangular protrusion shown in the figure, and may also be of other shapes.
  • each heat dissipation strip is provided with three first protrusions 301 and second protrusions 302.
  • the first heat sink 3 is further provided with a heat dissipation pipe 36, and the heat dissipation pipe 36 is used to connect the heat dissipation bars 31 together to reduce the heat of the heat dissipation bars 31.
  • Conducting conduction improves the uniformity of heat conduction of the entire first heat sink 3, and makes the heat distribution on the entire first heat sink 3 more uniform.
  • the adjacent heat dissipation bars 31 may be connected as a whole by the connecting piece 33.
  • the connecting piece 33 and the heat dissipation bar 31 are preferably pivotally connected.
  • the two adjacent heat dissipation strips 31 can still be folded relative to each other.
  • the connecting member 33 may be a bar-shaped rod provided at the ends of two adjacent heat-dissipating bars 31.
  • the extending direction of the bar-shaped bars is perpendicular to the extending direction of the heat-dissipating bars 31.
  • Mounting holes (not shown in the figure) are provided at the opposite ends of the member 33.
  • a horizontally arranged shaft 34 penetrates through the mounting holes of the heat sink 31 and the connecting member 33 to form a pivot connection.
  • the heat sink 31 Both the connecting member 33 and the connecting member 33 can rotate around the shaft 34, so that two adjacent heat dissipation bars can rotate relative to the connecting member, so that the two heat dissipation bars 31 can be bent.
  • the connecting member 33 may also be a rotating shaft 35 arranged in parallel with the heat sink 31.
  • the rotating shaft 35 is located between two adjacent heat sinks 31.
  • the end of the heat sink 31 is provided with an extension section containing a mounting hole. (The mounting holes are not shown in the figure).
  • the connecting member 33 may also have other structures, for example, it may also be a connecting wire that passes through the through holes of each heat dissipation bar to connect the heat dissipation bars in series, which will not be listed here. In this structure, even if the interval between two adjacent heat dissipation bars 31 is small, the first heat dissipation fin 3 can still be bent through the pivoted structure. Since the heat dissipation strips 31 are connected as a whole by the connecting piece 33, the structure is more stable.
  • the material of the connecting member is preferably a metal or other material with a heat-conducting function, so that the heat on the heat dissipation strips 31 can be transferred to each other through the connecting member, so that the heat distribution of the entire first heat sink 3 is more uniform.
  • the width and spacing of the heat dissipation strips 31 have a significant impact on the bending effect, heat dissipation effect, and support effect. If the spacing is too large, the width of the heat dissipation strips 31 is too narrow, which will lead to poor heat dissipation and poor support effects. , If the interval is too small, the width of the heat dissipation strip 31 is too wide, it will affect the bending effect.
  • the width L of the heat sink 31 satisfies 0.05mm ⁇ L ⁇ 20mm.
  • L can take values of 0.05nm, 0.1nm, 1nm, 2nm, 5nm, 10nm, 15nm, 20nm.
  • the width h of the interval between two adjacent heat dissipation bars 31 satisfies 0.1mm ⁇ h ⁇ 10mm.
  • h can take values of 0.1nm, 1nm, 2nm, 5nm, 8nm, and 10nm.
  • the bending effect of the first heat sink is smoother, the heat dissipation effect is ideal, and the structural stability and support effect is better.
  • the width L of the heat dissipation bar 31 is the width of the portion other than the first protrusion 301, that is, the minimum width of the heat dissipation bar.
  • the width h of the interval between two adjacent heat dissipation bars 31 is the distance between the parts of the two heat dissipation bars 31 excluding the first protrusion 301, that is, the maximum distance between two adjacent heat dissipation bars 31.
  • the size of the first protrusion 301 can be set according to the structure and the distance between the heat dissipation bars 31.
  • the heat dissipation strip 31 is also provided with through holes 32.
  • the through holes 32 make the heat dissipation strip 31 itself bendable, which further improves the first heat sink. Bendable performance.
  • the first heat sink adopts a sheet-like structure or a 31-like structure of the heat sink
  • its thickness is preferably no more than 1mm. This thickness can meet the heat dissipation requirements, and at the same time, the thickness of the entire device is not significantly increased, which is conducive to achieving a lighter and thinner configuration. .
  • the first heat sink 3 may include a non-bending area 30, and the non-bending area 30 may be a whole non-bendable structural layer.
  • the first heat sink 3 in the area corresponding to the non-bendable motherboard IC of the display panel, the first heat sink 3 can be set as a whole metal layer, and the other bendable area is a heat sink structure.
  • first heat sink 3 in the heat dissipation assembly shown in FIG. 3 has been described in detail above.
  • the first heat sink 3 may also be located on the side of the flexible battery 2 facing away from the flexible display panel 1 to absorb the heat emitted from the side of the flexible battery 2 facing away from the display panel 1 and also reduce The temperature of the battery 2 prevents the local temperature of the battery 2 from being too high.
  • the heat dissipation assembly further includes a heat insulation layer 4, and the first heat dissipation member 3 and the heat insulation layer 4 are both provided on the flexible display panel 1 and the flexible battery 2. In between, the heat insulation layer 4 is located between the first heat sink 3 and the flexible display panel 1.
  • the heat insulation layer 4 is in a sheet shape as a whole, and it also has a bendable area.
  • the function of the heat insulation layer 4 is to isolate the heat between the first heat sink 3 and the flexible display panel 1 to shield the thermal effect of the high temperature of the first heat sink 3 on the flexible display panel 1. Therefore, the thermal insulation layer 4 should be made of materials with lower thermal conductivity, such as organic materials such as rubber. At the same time, the heat insulation layer 4 should also have a bendable area so that it can also be bent or folded to match the overall structure of the display device. It is understandable that the bendable area of the thermal insulation layer 4 should correspond to the bendable area of the first heat sink 3, the flexible display panel 1 or the flexible battery 2. Then, a patterned opening 10 structure can also be provided on the heat insulation layer 4, or a material with higher flexibility can be selected. On the other hand, the heat-insulating layer 4 may further use an insulating material to prevent the current leaked from the battery 2 from being conducted to the display panel 1 via the first heat sink 3 and affecting the display panel 1.
  • the material of the heat insulation layer 4 is preferably rubber, silica gel, polyurethane, acrylic; or porous materials such as foam materials and fiber materials.
  • the hollow structure of the porous material can be filled with air or other media; Heat-reflective materials, such as gold-plated, silver-plated polyimide film.
  • the fixing method of the heat insulation layer 4 and the first heat sink 3 or the display panel 1 may be a mechanical connection method or an adhesive method.
  • the heat dissipation assembly further includes a second heat dissipation fin 5.
  • the first heat dissipation fin 3 and the heat insulation layer 4 are both provided on the flexible display panel 1 and the flexible battery 2, the heat insulation layer 4 is located between the first heat sink 3 and the flexible display panel 1, and the second heat sink 5 is located on the side of the flexible battery 2 away from the flexible display panel 1, and the whole is covered in a sheet shape.
  • One side of the flexible battery 2 is used to absorb the heat emitted by the side of the flexible battery 2 away from the display panel 1, so that the entire device has a more ideal heat dissipation performance.
  • the second heat sink 5 has a bendable area.
  • the bendable area of the second heat sink 5 corresponds to the bendable area of the first heat sink 3, the heat insulation layer 4, the flexible battery 2, and the flexible display panel 1.
  • the first heat sink 3 is located on the side of the flexible battery 2 away from the flexible display panel 1
  • the second heat sink 5 is located on the side of the flexible battery 2 facing the flexible display panel 1, that is, on the flexible battery 2.
  • the heat insulation layer may be arranged between the second heat sink 5 and the flexible display panel 1 to block the influence of the high temperature of the second heat sink 5 on the flexible display panel 1.
  • the heat insulation layer can always be arranged between the heat sink close to the flexible display panel and the flexible display panel.
  • the structure of the second radiating fin 5 may be the same as or different from that of the first radiating fin 3.
  • the material of the second heat sink 5 may be the same as or different from that of the first heat sink 3.
  • the first heat sink adopts the metal heat sink structure shown in FIG. 9 and the second heat sink adopts the entire graphene film layer; or the first heat sink adopts the metal patterned via structure of FIG. 6, and the second heat sink uses the metal patterned via structure shown in FIG.
  • the sheet adopts the metal heat sink structure shown in FIG. 9.
  • the fixing method of the second heat sink 5 and the flexible battery 2 refers to the first heat sink 3, and the structure of the bendable area of the second heat sink 5 also refers to the first heat sink 3, which will not be repeated here.
  • the parameters such as the thickness and size of the second heat sink 5 may also be the same as or different from those of the first heat sink 3.
  • FIG. 19 for another structure of the heat dissipation assembly of this embodiment, which includes a first heat sink 3, a heat insulation layer 4, a second heat sink 5, and a heat conducting member 6.
  • the first heat sink 3 and the heat insulation layer 4 are both arranged on Between the flexible display panel 1 and the flexible battery 2, the heat insulation layer 4 is located between the first heat sink 3 and the flexible display panel 1, the second heat sink 5 is located on the side of the flexible battery 2 away from the flexible display panel 1, and the heat conducting member 6 Between the first radiating fin 3 and the second radiating fin 5 and connecting the first radiating fin 3 and the second radiating fin 5, the heat-conducting member is 6-positioned at least on one side of the flexible battery 2 and is spaced apart from the flexible battery 2.
  • the heat conducting member 6 is used to absorb the heat on the first heat sink 3 and the second heat sink 5. Since the heat conducting member 6 is not in contact with the flexible battery 2, it further conducts the heat on the first heat sink 3 and the second heat sink 5 To the heat conducting member 6 to further reduce the heat of the battery 2.
  • the heat conducting member 6 may be a metal material, or an organic material with high heat conduction efficiency such as graphene.
  • the heat-conducting member 6 may be a columnar structure arranged between the first heat sink 3 and the second heat sink 5, or a sheet-like structure, of course, it may also be of other forms, which is not particularly limited in this application. It can be arranged on only one side of the battery 2, or on more sides.
  • the heat-conducting element 6 may be an integral structure with the first heat sink 3 or the second heat sink 5.
  • the heat conducting member 6 can also be connected to the heat pipe 36 to conduct heat away.
  • the display device further includes a heat dissipation unit 7, which is connected to at least one of the first heat sink, the second heat sink, or the heat-conducting member, and is used for absorbing the heat dissipation component. Heat and conduct it to the outside of the display device.
  • the heat dissipation unit 7 is disposed in the housing of the display device, and is used to conduct the absorbed heat to the outside of the housing, and may include structures such as heat dissipation fins, fans, and the like.
  • the heat dissipation unit 7 is provided on a side of the flexible battery 2.
  • the first radiating fin 3 extends outward along the side relative to the second radiating fin 5 until it is connected to the radiating unit 7.
  • the leftward arrow in the figure indicates the omitted extension.
  • the second heat sink 5 or the heat conducting member 6 may also extend toward the heat dissipation unit 7, which is not specifically limited in this application.
  • Figure 19 also shows the cover 8 covering the light-emitting side of the display panel 1 and the flexible circuit board 9 connected to the display panel 1 in the display device.
  • the display device also includes other components such as a driver IC and a housing. List them one by one.
  • the size of the flexible battery 2 is larger than that of the flexible display panel 1. In other embodiments, the size of the flexible battery 2 may also be equal to or smaller than the flexible display panel 1.
  • display devices which can be televisions, laptops, tablets, wearable display devices, mobile phones, car displays, navigation, e-books, digital photo frames, advertising light boxes, etc. Any product or component with display function.

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PCT/CN2021/086289 2020-05-25 2021-04-09 柔性显示装置 Ceased WO2021238450A1 (zh)

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CN110767096A (zh) * 2019-11-15 2020-02-07 京东方科技集团股份有限公司 支撑结构及显示装置
CN111564677A (zh) * 2020-05-25 2020-08-21 京东方科技集团股份有限公司 柔性显示装置

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US12015133B2 (en) 2024-06-18
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