CN108878487B - Display device and method for manufacturing the same - Google Patents

Display device and method for manufacturing the same Download PDF

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CN108878487B
CN108878487B CN201810671863.XA CN201810671863A CN108878487B CN 108878487 B CN108878487 B CN 108878487B CN 201810671863 A CN201810671863 A CN 201810671863A CN 108878487 B CN108878487 B CN 108878487B
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layer
flexible
electrode
flexible display
forming
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CN108878487A (en
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杜春雷
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan China Star Optoelectronics Technology Co Ltd
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    • 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
    • H10K59/40—OLEDs integrated with touch screens
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/1201—Manufacture or treatment
    • 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

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The application discloses a display device and a preparation method thereof, wherein the preparation method comprises the steps of providing a flexible display, and coating adhesive on the flexible display; forming a flexible battery, wherein the flexible battery supplies power for the flexible display; and (3) adhering the flexible battery to the flexible display through the adhesive by a rolling process. By the mode, the weight of the flexible display device can be reduced, and the flexible display device can be ultrathin.

Description

Display device and method for manufacturing the same
Technical Field
The present disclosure relates to display technologies, and particularly to a display device and a manufacturing method thereof.
Background
As a leader of next-generation display devices, flexible display devices are known not only to replace existing display products but also to create many new application markets leading to rapid growth of the entire display field. Compare in traditional hard screen display spare, flexible display spare has but free deformation, low-power consumption, and ultralight is ultra-thin, and breakage-proof prevents technical advantage such as fall, and its application mainly focuses on portable wearing equipment, intelligent terminal equipment, commercial propaganda equipment and for military use equipment etc..
Smart wearable devices such as portable watches, bracelets and flexible mobile phones are the most important and most promising application directions for mass production of flexible display devices, and S7 egde mobile phones of samsung corporation and G-Flex mobile phones of LG corporation all use flexible AM flexible displays. However, these flexible display devices are only bent under a fixed radius of curvature or only moderately bent at the edges, and do not really realize the concepts of freely deformable, foldable, etc. in flexible displays. To achieve the real flexibility of the smart phone or watch, the following three challenges are faced:
1. the stress born by the flexible display screen in a bending state also needs to be reduced through the design of a structure and a manufacturing process; 2. the power supply used by the flexible electronic product in the market at present is still an inflexible lithium battery, so that a space for assembling the battery must be reserved in the design of the mobile phone, the weight and the thickness of the mobile phone are increased, and the mobile phone can not be repeatedly bent and folded in a true sense all the time. How to realize the integration of the flexible screen and the flexible power supply is a key technology for determining the application potential of the flexible mobile phone or the watch.
Disclosure of Invention
The application provides a display device and a manufacturing method thereof, which can reduce the weight of flexible display equipment and realize the ultra-thinness of the flexible display equipment.
In order to solve the technical problem, the application adopts a technical scheme that: there is provided a method of manufacturing a display device, the method including: providing a flexible display, and coating adhesive on the flexible display; forming a flexible battery, wherein the flexible battery supplies power to the flexible display; and the flexible battery is attached to the flexible display through the adhesive by a rolling process.
In order to solve the above technical problem, another technical solution adopted by the present application is: the display device comprises a flexible display and a flexible battery, wherein the flexible battery is attached to the flexible display through a bonding adhesive to supply power to the flexible display.
The beneficial effect of this application is: according to the touch panel and the preparation method thereof, the flexible display and the flexible battery are integrated into the self-powered flexible display device, redundant assembly space does not need to be designed for a power supply, the weight of the flexible display device is reduced, and the flexible display device can be ultrathin.
Drawings
FIG. 1 is a schematic flow chart of one embodiment of a method for fabricating a display device according to the present application;
FIG. 2 is a schematic flow chart of an embodiment of a method for manufacturing a flexible display according to the present application;
FIG. 3 is a schematic structural diagram of an embodiment of a flexible display according to the present application;
FIG. 4 is a schematic flow chart illustrating an embodiment of step S2;
FIG. 5 is a schematic flow chart illustrating an embodiment of step S21 in the present application;
FIG. 6 is a schematic structural diagram of an embodiment of the flexible battery of the present application;
FIG. 7 is a schematic flow chart illustrating an embodiment of step S23 in the present application;
FIG. 8 is a schematic view of the structure of one embodiment of the display device assembly of the present application;
fig. 9 is a schematic structural diagram of an embodiment of a display device according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a manufacturing method of a display device according to an embodiment of the present disclosure. The method for manufacturing the display device provided by the present application as shown in fig. 1 comprises the following steps:
s1, providing a flexible display, and coating adhesive on the flexible display.
Referring to fig. 2, fig. 2 is a schematic flow chart of an embodiment of a method for manufacturing a flexible display according to the present application, and as shown in fig. 2, step S1 further includes the following sub-steps:
and S11, forming a functional layer on the second flexible substrate, wherein the functional layer comprises a luminous layer.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an embodiment of the flexible display of the present application, and as shown in fig. 3, a material of the second flexible substrate 110 in this embodiment may be one of Polyimide (PI) or Polydimethylsiloxane (PDMS), which is not further limited herein. In this embodiment, polyimide is used as the first flexible substrate material.
Further, a functional layer a is prepared on the second flexible substrate 110, and optionally, the functional layer further includes a thin film transistor layer (TFT)120 and an OLED light emitting layer 130. The OLED light-emitting layer 130 may specifically include a hole transport layer, a light-emitting layer, and an electron transport layer (not shown), and the specific structure of the TFE layer 120 may refer to a general structure in the prior art, which is not described herein again. Wherein, the side of the second flexible substrate 110 away from the functional layer a is coated with an adhesive for bonding with the flexible battery. In this embodiment, the adhesive 200 may be an oca (optical Clear adhesive) optical adhesive which is colorless and transparent, has a light transmittance of 90% or more, has a good adhesive strength, can be cured at room temperature or at an intermediate temperature, and has a small curing shrinkage.
And S12, forming a second packaging layer on the functional layer.
Optionally, a second encapsulation layer 140 and a flexible plastic cover 150 are formed on the functional layer a, where the second encapsulation layer 140 is used for encapsulating the flexible display 100, and the flexible plastic cover 150 is used for protecting the flexible display 100.
In addition, the Flexible display 100 further includes a printed circuit Board (FPC) (not shown), and a pin (not shown) of the functional layer a disposed on the FPC Board, where the pin is used to connect with a corresponding pin on the Flexible battery, so as to implement a self-powered system integrating the Flexible display and the Flexible power supply.
And S2, forming a flexible battery, wherein the flexible battery supplies power for the flexible display.
Referring to fig. 4, step S2 further includes the following sub-steps:
s21, forming a first electrode layer on the first flexible substrate, wherein the first electrode layer includes a first electrode pin.
The first electrode layer B in the present embodiment includes a collective flow layer 320, a first electrode pin a, and a first electrode material layer 330.
Referring to fig. 5, step S21 further includes the following sub-steps:
and S211, forming a current collector layer on the first flexible substrate.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a flexible battery according to an embodiment of the present disclosure. In this embodiment, a substrate is first provided, and the substrate may be a transparent substrate such as a glass substrate, which is not further limited herein. A polyimide film (PI) is coated on the substrate base plate to form a first flexible substrate 310.
Single-layer graphene prepared by Chemical Vapor Deposition (CVD) is further transferred from the copper foil onto the first flexible substrate 310 using a wet transfer technique, three times to form a three-layer graphene structure to form the collector layer 320. The collective flow layer 320 has a three-layer graphene structure, and has a light transmittance of 90% or more and a reduced sheet resistance.
In the embodiment, the flexible battery is prepared by adopting a chemical vapor deposition technology, the defect-free ultra-light and thin graphene with high conductivity is used as a current collector, the electron transmission performance is enhanced, the multiplying power performance and the power density of the battery are improved, the power supply to the flexible display is more stable, and the bending amount of a battery device is enhanced due to the high Young modulus of the graphene, so that the whole flexible display can keep stable performance in a repeatedly bent state.
S212, evaporating a first electrode on the collective flow layer to form a first electrode pin.
A first electrode (gold electrode) is further vapor-deposited on the collective flow layer 320 to form a first electrode pin a.
And S213, forming a first electrode material layer on the collective flow layer.
A first electrode material layer 330 (positive electrode) is formed on the collector layer 320 by magnetron sputtering, and the first electrode material layer 330 may be cobalt lithium oxide (LiCoO 2).
And S22, forming an electrolyte layer on the first electrode layer.
In step S22, specifically, the electrolyte layer 340 is formed on the first electrode material layer 330 in the first electrode layer B by magnetron sputtering, and the electrolyte layer 340 may be solid lithium phosphorus oxynitride (LiPON).
And S23, forming a second electrode layer on the electrolyte layer, wherein the second electrode layer comprises a second electrode pin.
The second electrode layer C in this embodiment includes the second electrode material layer 350 and the second electrode pin b, referring to fig. 7, the step S23 further includes the following sub-steps:
and S231, forming a second electrode material layer on the electrolyte layer.
A second electrode material layer 350 (negative electrode) of metallic lithium is formed on the electrolyte layer 340 by evaporation, and this step needs to be performed in a glove box filled with nitrogen gas to prevent the metallic lithium from being oxidized.
And S232, evaporating a second electrode on the second electrode material layer to form a second electrode pin.
A second electrode (gold electrode) is formed on the second electrode material layer 350 by evaporation to form a second electrode lead b. The first electrode pin a and the second electrode pin are respectively connected to corresponding pins on a printed circuit board in the flexible display 100, so as to form a flexible display/flexible power supply integrated self-powered system. And the flexible battery 300 can drive the OLED light emitting layer 130 of the flexible display 100 to emit light after being fully charged, so as to achieve the flexible display effect.
And S24, forming a first packaging layer on the second electrode layer.
The first encapsulation layer 360 may be Polydimethylsiloxane (PDMS).
And S25, peeling the first flexible substrate to form the flexible battery.
The first flexible substrate 310 is peeled off from the substrate base plate by a laser peeling technique to form a flexible self-supporting lithium ion battery (flexible battery).
In other embodiments, Polydimethylsiloxane (PDMS) may also be used as the material of the first flexible substrate, and the first electrode layer and the collective flow layer may be integrated into a material layer, that is, the material of the first electrode layer may be a composite material of three-dimensional graphene foam and lithium iron phosphate, where the lithium iron phosphate may be formed by in-situ growth on the surface of the three-dimensional graphene foam by a hydrothermal method.
The preparation method of the flexible battery is similar to that in the first embodiment, and the specific preparation process of the battery in this embodiment is to evaporate a second electrode material layer on a first flexible substrate (PDMS), where the second electrode material layer is formed by evaporating metal lithium as a negative electrode of the flexible battery, and simultaneously evaporate a second electrode (gold electrode) as a second electrode pin, and form a solid electrolyte Layer (LiPON) on the second electrode material layer by magnetron sputtering, and then coat a first electrode material layer, where the first electrode material layer and the current collector layer are integrated into one material layer, that is, a three-dimensional graphene foam/lithium iron phosphate composite material is adopted, and the flexible battery device is further encapsulated by another flexible PDMS material. And the flexible battery after the packaging formation can be attached to the flexible display through adhesive glue, so as to form the self-powered flexible display device.
And S3, adhering the flexible battery to the flexible display through the adhesive by a rolling process.
Referring to fig. 8, after the flexible display 100 and the flexible battery 300 are manufactured, the side of the second flexible substrate 110 of the flexible display 100, which is away from the functional layers, is coated with the adhesive 200, the first flexible substrate 310 of the flexible battery 300 is attached to the flexible display 100 in a face-to-face manner, and then the flexible display 100 and the flexible battery 300 are attached and compacted by a rolling process. In this embodiment, the rolling process is adopted to gradually attach the flexible display 100 and the flexible battery 300, so that the phenomena of bubbles and the like caused by uneven attachment between the flexible display 100 and the flexible battery 300 can be prevented. The first electrode layer and the second electrode layer of the flexible battery 300 are respectively led out through the first electrode pin and the second electrode pin, and are connected to corresponding pins of a Flexible Printed Circuit (FPC) of the flexible display 100, so as to complete integration of flexible display and flexible power supply integration.
In this application, integrate flexible display and flexible battery into a self-powered flexible display device, use in smart mobile phone or wrist-watch, need not to have lightened flexible display device's weight for unnecessary assembly space of power supply design to can realize flexible display device's ultra-thinness. In addition, the flexible display and the flexible battery use the same flexible substrate, and can be synchronously bent, so that the display device can realize the real bendable performance.
With reference to fig. 9, the present application further provides a display device, which includes a flexible display 100 and a flexible battery 300, wherein the flexible battery 300 is attached to the flexible display 100 by an adhesive 200 to supply power to the flexible display 100.
In fig. 6, the flexible battery 300 may specifically include a first flexible substrate 310, a first electrode layer B, an electrolyte layer 340, a second electrode layer C, and a first package layer 360.
Optionally, the first electrode layer B is formed on the first flexible substrate 310, including the first electrode pin.
The electrolyte layer 340 is formed on the first electrode layer B. The second electrode layer C is formed on the electrolyte layer 340 and includes a second electrode lead; the first encapsulation layer 360 is formed on the second electrode layer C to encapsulate the flexible battery 300.
In this embodiment, the material of the first flexible substrate layer 310 of the flexible battery 300 may be one of polyimide or Polydimethylsiloxane (PDMS). In this embodiment, the first electrode layer B may include a current collector layer and a first electrode material layer, where the current collector layer may be made of ultra-thin and high-conductivity three-layer graphene, which may enhance electron transport performance, improve battery rate performance and power density, and provide more stable power supply to the flexible display, and the bending amount of the battery device is enhanced due to the higher young modulus of graphene, so that the entire flexible display may maintain stable performance in a repeatedly bent state.
In addition, in other embodiments, the current collector layer and the first electrode material layer in the first electrode layer B may be integrated into a layer of material, that is, a composite material of three-dimensional graphene foam and lithium iron phosphate is adopted, where the lithium iron phosphate may be formed by in-situ growth on the surface of the three-dimensional graphene foam by a hydrothermal method.
The detailed structure and principle of the flexible battery 300 are described in detail in the detailed description of an embodiment of the flexible battery, and are not described herein again.
The flexible display 100 may include a second flexible substrate 110, a functional layer a, and a second encapsulation layer 140, which are sequentially stacked, and the second flexible substrate 110 is adhered to the first flexible substrate 310 by an adhesive 200. The functional layer a includes a thin film transistor layer 120 and an OLED light emitting layer 130. The OLED light emitting layer 130 may specifically include a hole transport layer, a light emitting layer, and an electron transport layer. The side of the second flexible substrate 110 away from the functional layer a is coated with an adhesive 200 for bonding with the flexible battery 300.
For details of the specific structure and principle of the flexible display 100, please refer to the detailed description in the implementation of the flexible display, which is not described herein again.
In the above embodiment, the flexible display and the flexible battery are integrated into a self-powered flexible display device, and the self-powered flexible display device is applied to a smart phone or a watch, so that redundant assembly space does not need to be designed for a power supply, the weight of the flexible display device is reduced, and the ultra-thinness of the flexible display device can be realized. In addition, the flexible display and the flexible battery use the same flexible substrate, and can be synchronously bent, so that the display device can realize the real bendable performance.
In summary, it is easily understood by those skilled in the art that the present application provides a display device and a method for manufacturing the same, in which a flexible display and a flexible battery are integrated into a self-powered flexible display device, there is no need to design an extra assembly space for a power supply, the weight of a flexible display device is reduced, and the flexible display device can be made ultra-thin.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (2)

1. A method of manufacturing a display device, the method comprising:
providing a flexible display, and coating adhesive on the flexible display; which comprises the following steps: forming a functional layer on a second flexible substrate, the functional layer including a light emitting layer; forming a second encapsulation layer on the functional layer to form a flexible display; the second flexible substrate is made of polyimide materials, and the side, away from the functional layer, of the second flexible substrate is coated with the adhesive and is used for being attached to the first flexible substrate of the flexible battery;
coating a polyimide film on a substrate base plate to form the first flexible substrate;
forming a first electrode layer on the first flexible substrate; which comprises the following steps: transferring single-layer graphene prepared by a chemical vapor deposition technology from a copper foil to the first flexible substrate by adopting a wet transfer technology, and transferring for three times to form a three-layer graphene structure so as to form a collective flow layer, wherein the light transmittance of the collective flow layer is over 90 percent, and the sheet resistance is reduced; evaporating a first electrode on the collective flow layer to form a first electrode pin; forming a first electrode material layer on the collective flow layer;
forming an electrolyte layer on the first electrode layer;
forming a second electrode layer on the electrolyte layer; which comprises the following steps: forming a second electrode material layer on the electrolyte layer; evaporating a second electrode on the second electrode material layer to form a second electrode pin, wherein the first electrode pin and the second electrode pin are respectively electrically connected with the flexible display, so that the integration of the flexible display and the flexible power supply is completed;
forming a first packaging layer on the second electrode layer;
peeling the first flexible substrate from the substrate base plate to form the flexible battery, wherein the flexible battery supplies power to the flexible display;
and the flexible battery is attached to the flexible display through the adhesive by a rolling process.
2. The display device is characterized by comprising a flexible display and a flexible battery, wherein the flexible battery is attached to the flexible display through a bonding adhesive to supply power to the flexible display; wherein the laminating process includes: the flexible battery is attached to the flexible display through the adhesive through a rolling process;
the flexible display comprises a second flexible substrate, a functional layer and a second packaging layer which are sequentially stacked, wherein the functional layer comprises a light emitting layer; the side, away from the functional layer, of the second flexible substrate is coated with the adhesive, and the second flexible substrate is made of polyimide materials;
the flexible battery includes:
the first flexible substrate is made of polyimide materials, and is bonded to the second flexible substrate through the adhesive glue;
a first electrode layer formed on the first flexible substrate, including a collective flow layer, a first electrode pin, and a first electrode material layer, wherein forming the first electrode layer includes: transferring the single-layer graphene prepared by the chemical vapor deposition technology from the copper foil to the first flexible substrate by adopting a wet transfer technology, and transferring for three times to form a three-layer graphene structure so as to form the collective flow layer, wherein the light transmittance of the collective flow layer is over 90 percent, and the sheet resistance is reduced; evaporating a first electrode on the collective flow layer to form the first electrode pin; forming the first electrode material layer on the collective flow layer;
an electrolyte layer formed on the first electrode layer;
the second electrode layer is formed on the electrolyte layer and comprises a second electrode pin and a second electrode material layer; wherein forming the second electrode layer comprises: forming the second electrode material layer on the electrolyte layer; evaporating a second electrode on the second electrode material layer to form a second electrode pin, wherein the first electrode pin and the second electrode pin are respectively electrically connected with the flexible display, so that integration of flexible display and a flexible power supply is completed;
and the first packaging layer is formed on the second electrode layer and used for packaging the flexible battery.
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CN111900106B (en) * 2020-06-30 2022-03-08 中国电子科技集团公司第五十五研究所 Large-area flexible substrate InP HBT device and preparation method thereof
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