CN110246880B - Preparation method of display panel and display panel - Google Patents
Preparation method of display panel and display panel Download PDFInfo
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- CN110246880B CN110246880B CN201910513113.4A CN201910513113A CN110246880B CN 110246880 B CN110246880 B CN 110246880B CN 201910513113 A CN201910513113 A CN 201910513113A CN 110246880 B CN110246880 B CN 110246880B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/87—Arrangements for heating or cooling
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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
- H10K59/10—OLED displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- 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
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- 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
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention provides a preparation method of a display panel and the display panel, wherein a glass substrate in a lower substrate in the existing display panel is peeled off, at least one part of a substrate of a flexible substrate in the lower substrate is converted into a graphene flexible substrate with a graphene structure, the display panel is rapidly cooled through the good heat conduction performance of graphene, and meanwhile, the graphene flexible substrate replaces the original foam/graphite/copper foil three-in-one cooling structure in the display panel, so that the thickness of the display panel is reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel and a preparation method thereof.
Background
Display panels, such as Organic Light-Emitting diodes (OLEDs), have attracted great attention in academia and industry because of their great potential for development in the direction of solid-state lighting and flat panel displays. The flexible OLED display screen has the characteristics of low power consumption, high resolution, quick response, flexibility and the like, so that the flexible OLED display screen is a popular development direction in the display industry, and the thinner the thickness of the flexible OLED display screen is, the greater the market competitiveness is. At present, flexible materials such as Polyimide (PI) or poly (ethylene terephthalate) (PET) are generally used as a substrate, a Thin Film Transistor (TFT), an OLED, and a Thin film encapsulation layer (TFE) are sequentially prepared on the substrate, and then a polarizer and an encapsulation are continuously prepared on the substrate.
In order to drive the TFT, a circuit needs to be prepared on the bottom of the flexible substrate. When the display panel works, current generates heat through the TFT circuit, and a Back Plate (BP) and a foam/graphite/copper foil three-in-one structure is usually added on the Back of the polyimide film for the convenience of heat dissipation, wherein the three-in-one structure comprises foam, graphite and copper foil (Cu coil) made of acrylic materials, but the thickness of the three-in-one structure is larger and is 50-100 um; and graphite is the lamellar structure, and the heat mainly conducts along the lamella direction, and display panel's radiating effect is not ideal enough.
Disclosure of Invention
The invention provides a preparation method of a display panel and the display panel, aiming at the problems of large thickness and poor heat dissipation effect of the display panel in the prior art.
In a first aspect, the present invention provides a method for manufacturing a display panel, the method comprising:
providing a glass substrate;
forming a flexible substrate on the glass substrate;
sequentially preparing an array layer, a light-emitting layer and a packaging layer on the flexible substrate;
peeling off the glass substrate on the flexible substrate;
converting at least a part of the flexible substrate into a graphene flexible substrate having a graphene structure.
Further, the peeling of the glass substrate on the flexible substrate includes:
and stripping the glass substrate on the flexible substrate by adopting a laser cutting mode.
Further, the converting at least a part of the flexible substrate into a graphene flexible substrate having a graphene structure includes:
converting at least a portion of the flexible substrate into a graphene flexible substrate having a graphene structure by a laser-induced process.
Further, the power of the laser in the laser induction process is between 0.5 and 3W.
Further, the method further comprises: and attaching heat-conducting metal to the back surface of the graphene flexible substrate to dissipate heat.
Further, the method further comprises: and sequentially carrying out a module process above the packaging layer so as to protect the display panel.
Further, the graphene structure in the graphene flexible substrate is a vertical protrusion structure, so that heat is conducted through a vertical path.
In a second aspect, the present invention also provides a display panel, comprising:
at least one part of the flexible substrate is a graphene flexible substrate with a graphene structure;
the array layer is positioned above the graphene flexible substrate;
a light emitting layer over the array layer;
an encapsulation layer located over the light emitting layer;
further, the display panel further comprises a heat conducting metal, and the heat conducting metal is located below the graphene flexible substrate and attached to the graphene flexible substrate.
Further, the graphene structure is a vertical convex structure, so that heat can be conducted through a vertical path.
The invention provides a preparation method of a display panel and the display panel, wherein a glass substrate in a lower substrate in the existing display panel is peeled off, at least one part of a substrate of a flexible substrate in the lower substrate is changed into a graphene flexible substrate with a graphene structure, the display panel is rapidly cooled through the good heat conduction performance of graphene, and meanwhile, the graphene flexible substrate replaces the original foam/graphite/copper foil three-in-one cooling structure in the display panel, so that the thickness of the display panel is reduced.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a method for manufacturing a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an embodiment of a display panel prepared in step S2 according to the present invention;
FIG. 3 is a flowchart of an embodiment of step S3 provided by the present invention;
FIG. 4 is a schematic structural diagram of an embodiment of a display panel prepared in step S3 according to the present invention;
FIG. 5 is a schematic structural diagram of a display panel after peeling of a glass substrate according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an embodiment of converting a flexible substrate into a graphene substrate according to the present invention;
FIG. 7 is a schematic diagram of a structure of a display panel after a module process is completed according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display panel according to an embodiment of the present invention.
Detailed Description
The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals.
The drawings and description are to be regarded as illustrative in nature, and not as restrictive. In the drawings, elements having similar structures are denoted by the same reference numerals. In addition, the size and thickness of each component shown in the drawings are arbitrarily illustrated for understanding and convenience of description, but the present invention is not limited thereto.
In the drawings, the thickness of layers, films, panels, regions, etc. are exaggerated for clarity. In the drawings, the thickness of some layers and regions are exaggerated for convenience of understanding and convenience of description. It is noted that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be referred to as being "on" another element. The component may be directly on the other component or intervening components may also be present.
In addition, in the description, unless explicitly described to the contrary, the word "comprise" will be understood to mean that the recited components are included, but not to exclude any other components. Further in the specification, "on … …" means above or below the target component, and does not mean that it must be on top based on the direction of gravity.
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined invention, the following detailed description is provided for the specific implementation, structure, features and effects of the display panel and the manufacturing method of the display panel according to the present invention with reference to the accompanying drawings and the preferred embodiments.
The invention provides a preparation method of a display panel aiming at the problems of larger thickness and poor heat dissipation effect of the display panel in the prior art, and as shown in figure 1, the flow diagram of the embodiment of the preparation method of the display panel provided by the invention is provided.
The preparation method of the display panel comprises the following steps:
s1, providing a glass substrate;
s2, forming a flexible substrate on the glass substrate;
s3, sequentially preparing an array layer, a light-emitting layer and a packaging layer on the flexible substrate;
s4, peeling the glass substrate on the flexible substrate;
s5, converting at least a part of the flexible substrate into a graphene flexible substrate with a graphene structure.
According to the preparation method of the display panel, the glass substrate in the lower substrate in the existing display panel is peeled off, at least one part of the substrate of the flexible substrate in the lower substrate is converted into the graphene flexible substrate with the graphene structure, the display panel is rapidly cooled through the good heat conduction performance of graphene, the graphene flexible substrate replaces the original foam/graphite/copper foil three-in-one cooling structure in the display panel, and the thickness of the display panel is reduced.
As shown in fig. 2, which is a schematic structural diagram of an embodiment of the display panel prepared in step S2 provided in the present invention, wherein the flexible substrate 210 is prepared above the glass substrate 110. In some embodiments of the present invention, the material of the flexible substrate in the step S2 of forming the flexible substrate on the glass substrate is a type of polymer precursor.
Specifically, the polymer precursor may be an organic substance such as polyimide or polysulfone. The method for preparing the flexible substrate can adopt an organic coating method to prepare the flexible substrate.
In some other embodiments of the present invention, as shown in fig. 3, which is a flowchart illustrating an embodiment of step S3 provided in the present invention, the step S3 of sequentially preparing an array layer, a light emitting layer, and an encapsulation layer on the flexible substrate may include:
s301, preparing an array layer on the flexible substrate.
Specifically, preparing the array layer 310 on the flexible substrate may include preparing a buffer layer, a TFT layer, a planarization layer, an anode, and a pixel defining layer on the flexible substrate.
S302, preparing a light-emitting layer on the array layer.
Specifically, preparing the light emitting layer 320 on the array layer may include preparing a hole injection/transport layer, a light emitting layer, an electron transport/injection layer, a cathode on the array layer.
S303, preparing an encapsulation layer on the luminous layer.
Specifically, preparing the encapsulation layer 330 on the light emitting layer 320 may include preparing a plurality of organic film layers and inorganic film layers on the light emitting layer to encapsulate the display panel.
The organic film layers and the inorganic film layers can be formed by overlapping inorganic/organic/inorganic multilayer films.
It should be noted that, in the embodiment of the present invention, a specific method for preparing the array layer 310, the light emitting layer 320 and the encapsulation layer 330 may refer to the prior art, and is not limited herein.
As shown in fig. 4, which is a schematic structural diagram of an embodiment of the display panel prepared in step S3 provided by the present invention, the array layer 310, the light emitting layer 320, and the encapsulation layer 330 are sequentially prepared above the flexible substrate 210.
Fig. 5 is a schematic structural diagram of a display panel after peeling off a glass substrate according to an embodiment of the present invention. In some embodiments of the present invention, the step S4 of glass the glass substrate on the flexible substrate may include: and carrying out laser stripping on the glass substrate so that the glass substrate is separated from the flexible substrate.
Fig. 6 is a schematic structural diagram of an embodiment of converting the flexible substrate provided by the present invention into a graphene substrate. In some embodiments of the present invention, the converting the flexible substrate into a graphene flexible substrate having a graphene structure in step S5 includes:
performing laser induction on the flexible substrate 210 subjected to laser lift-off to convert at least a part of the substrate of the flexible substrate 210 subjected to laser lift-off into a graphene flexible substrate having a graphene structure.
Specifically, in some embodiments of the present invention, after the flexible substrate 210 is laser-peeled, the original glass substrate 110 is peeled off, and at this time, the flexible substrate 210 is laser-induced, so that a part of the substrate of the flexible substrate 210 is converted into a graphene flexible substrate having a graphene structure under the action of the laser-induction.
In other embodiments of the present invention, the flexible substrate 210 after being subjected to laser lift-off is subjected to laser induction, and the whole flexible substrate 210 may also be converted into a graphene flexible substrate having a graphene structure.
The laser component for performing laser induction on the flexible substrate after laser peeling can be carbon dioxide, and the laser induction process needs to be performed in an atmospheric environment or an argon environment.
In some embodiments of the present invention, the laser-induced laser power is between 0.5-3W.
Specifically, the laser-induced laser power may be 0.5W, 1W, 3W, or the like.
At least a part of the substrate of the flexible substrate 210 after laser stripping is changed into the flexible substrate 220 with the graphene structure after laser induction, and the graphene structure is a vertical protrusion structure, so that the heat generated by the display panel can be diffused out along the vertical protrusion structure, the heat dissipation path is shortened, the heat can be quickly dissipated, and the heat dissipation effect is improved.
In some embodiments of the present invention, the method for manufacturing a display panel may further include: and sequentially carrying out module process on the packaging layer to protect the display panel. Fig. 7 is a schematic view of a structure of an embodiment of a display panel after a module process is completed according to the present invention.
Specifically, the sequentially performing the module process on the encapsulation layer may include: preparing an optical adhesive 410 on the encapsulation layer 330; preparing a touch module 420 on the optical adhesive 410; preparing a polarizer 430 on the touch module 420; a cover plate 440 is prepared on the polarizer 430.
It should be noted that, the above module processes performed on the package layer in sequence may refer to the prior art, and are not limited herein.
In some embodiments of the present invention, the method for manufacturing a display panel may further include: the metal layer 510 is attached to the back surface of the graphene flexible substrate formed after the laser induction, so that the heat dissipation can be performed more quickly.
Specifically, the metal layer may be a copper foil, and the metal copper has a good heat dissipation property, so that the display panel can be better cooled.
The present invention further provides a display panel, as shown in fig. 8, which is a schematic structural diagram of an embodiment of the display panel provided in the present invention, and in some embodiments of the present invention, the display panel may include:
a graphene flexible substrate 220;
an array layer 320 located above the graphene flexible substrate 220;
a light emitting layer 330 over the array layer 320;
and an encapsulation layer 340 over the light emitting layer 330.
According to the display panel provided by the invention, the glass substrate in the lower substrate in the existing display panel is peeled off, at least one part of the substrate of the flexible substrate in the lower substrate is converted into the graphene flexible substrate with the graphene structure, the display panel is rapidly cooled through the good heat-conducting property of graphene, and meanwhile, the graphene flexible substrate replaces the original foam/graphite/copper foil three-in-one cooling structure in the display panel, so that the thickness of the display panel is reduced.
In some embodiments of the present invention, the array layer 310 may include: buffer layer, TFT layer, planarization layer, anode, pixel definition layer.
In some embodiments of the present invention, the light emitting layer 320 may include: hole injection/transport layer, light emitting layer, electron transport/injection layer, cathode.
In some embodiments of the present invention, the encapsulation layer 330 may include a plurality of organic film layers and inorganic film layers to encapsulate the display panel.
The organic film layers and the inorganic film layers can be formed by overlapping inorganic/organic/inorganic multilayer films.
On the basis of the above embodiments, in other embodiments of the present invention, the display panel may further include: the optical adhesive 410, the touch module 420, the polarizer 430, and the cover plate 440 are sequentially prepared on the encapsulation layer 330.
In some embodiments of the present invention, the display panel may further include a metal layer 510, where the metal layer 510 is located on the lower surface of the graphene flexible substrate 310 and is attached to the back surface of the graphene flexible substrate 310, and radiates heat through the heat conduction effect of metal.
Specifically, the metal layer may be a copper foil, and the metal copper has a good heat dissipation property, so that the display panel can be better cooled.
According to the above object of the present invention, a display panel is provided, which includes the above manufacturing method of the display panel. The working principle of the display panel provided in this embodiment is the same as the working principle of the embodiment of the display panel manufacturing method, and specific structural relationships and working principles refer to the embodiment of the display panel manufacturing method, which is not described herein again.
It should be noted that, according to the explanation and illustration of the above description, the person skilled in the art can make variations and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some equivalent modifications and variations of the present invention should be covered by the protection scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (6)
1. A method for manufacturing a display panel, the method comprising:
providing a glass substrate;
forming a flexible substrate on the glass substrate;
sequentially preparing an array layer, a light-emitting layer and a packaging layer on the flexible substrate;
peeling off the glass substrate on the flexible substrate;
converting at least a portion of the flexible substrate into a graphene flexible substrate having a graphene structure;
the graphene structure in the graphene flexible substrate is a vertical convex structure, so that heat is conducted through a vertical path.
2. The method for manufacturing a display panel according to claim 1, wherein the peeling of the glass substrate on the flexible substrate includes:
and stripping the glass substrate on the flexible substrate by adopting a laser cutting mode.
3. The method for manufacturing a display panel according to claim 1, wherein the converting at least a part of the flexible substrate into a graphene flexible substrate having a graphene structure comprises:
converting at least a portion of the flexible substrate into a graphene flexible substrate having a graphene structure by a laser-induced process.
4. The method for manufacturing a display panel according to claim 3, wherein the power of the laser in the laser inducing process is between 0.5W and 3W.
5. The method for manufacturing a display panel according to claim 1, further comprising: and attaching heat-conducting metal to the back surface of the graphene flexible substrate to dissipate heat.
6. The method for manufacturing a display panel according to claim 1, further comprising: and sequentially carrying out a module process above the packaging layer so as to protect the display panel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910513113.4A CN110246880B (en) | 2019-06-14 | 2019-06-14 | Preparation method of display panel and display panel |
| PCT/CN2019/107403 WO2020248431A1 (en) | 2019-06-14 | 2019-09-24 | Method for preparing display panel, and display panel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910513113.4A CN110246880B (en) | 2019-06-14 | 2019-06-14 | Preparation method of display panel and display panel |
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| CN110246880A CN110246880A (en) | 2019-09-17 |
| CN110246880B true CN110246880B (en) | 2022-01-25 |
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| WO (1) | WO2020248431A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110246880B (en) * | 2019-06-14 | 2022-01-25 | 武汉华星光电半导体显示技术有限公司 | Preparation method of display panel and display panel |
| CN111029380A (en) * | 2019-12-06 | 2020-04-17 | 武汉华星光电半导体显示技术有限公司 | Display device |
| CN111194461B (en) * | 2019-12-19 | 2021-11-23 | 重庆康佳光电技术研究院有限公司 | Display panel, preparation method thereof and display |
| CN114300635A (en) * | 2021-12-27 | 2022-04-08 | 深圳市华星光电半导体显示技术有限公司 | Display device and method for manufacturing the same |
| CN114627768B (en) * | 2022-04-06 | 2024-03-15 | 深圳市华星光电半导体显示技术有限公司 | Flexible OLED display module, manufacturing method and terminal equipment |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2020248431A1 (en) | 2020-12-17 |
| CN110246880A (en) | 2019-09-17 |
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