CN113793860A - Flexible display panel for improving ghost shadow and preparation method thereof - Google Patents
Flexible display panel for improving ghost shadow and preparation method thereof Download PDFInfo
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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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- 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
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/844—Encapsulations
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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
- H10K59/12—Active-matrix OLED [AMOLED] 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
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/80—Manufacture or treatment specially adapted for the organic devices covered by this subclass using temporary 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
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Abstract
The invention provides a flexible display panel for improving ghost and a preparation method thereof, and the flexible display panel for improving ghost comprises: the upper surface of the flexible substrate is sequentially provided with a thin film transistor layer and an organic light-emitting layer in a laminated manner; the protective layer is attached to the lower surface of the flexible substrate and used for reducing the ghost of the flexible display panel; and a thin film encapsulation layer covering the organic light emitting layer; the protective layer comprises a glue material layer and a functional layer, and the functional layer is attached to the lower surface of the flexible substrate through the glue material layer. Effectively improving the afterimage phenomenon of the flexible display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible display panel for improving ghost shadow and a preparation method thereof.
Background
The flexible AMOLED display can cause the phenomenon of Image Sticking after long-term use, and the Image Sticking can be generally divided into recoverable Image Sticking and unrecoverable Image Sticking, wherein the condition that the Image Sticking can be recovered in a short time is called Image Retention, and the condition that the Image Sticking can not be recovered for a long time is called Image Sticking. The retention of the residual shadow can seriously affect the display effect of the display.
In the prior art, a general test method for whether the ghost phenomenon exists is as follows: as shown in fig. 1, after the black-and-white checkerboard frame is lit up for one hour at an initial brightness (the initial brightness is about 350nits or more than 350 nis) by using the 255-gray-level white frame, the black-and-white checkerboard frame is switched to the 127-gray-level white frame (or other gray-level white frames), and whether the residual image is left within 3 minutes is observed.
The phenomenon of afterimage which can be recovered in a short time of the AMOLED display is due to the hysteresis phenomenon existing in the polysilicon thin film transistor, so that the threshold voltage (Vth) is shifted: according to the basic structure of the existing flexible display panel, tests show that the condition of generating the Image Retention phenomenon is common and the display effect is seriously influenced; the basic structure of the conventional flexible display panel is shown in fig. 2, and usually a thin film transistor layer (2) and an organic light emitting layer (3), i.e., an OLED device, are fabricated on a flexible substrate (1) (mostly made of a high temperature resistant polyimide material on a glass substrate by a coating and curing process), and a thin film encapsulation structure, i.e., a thin film encapsulation layer (6), is fabricated on the organic light emitting layer (3) (OLED device) to prevent water and oxygen from invading, and the polyimide layer material is separated from glass by laser release, so that a support film (9) and a back adhesive tape functional layer (5) (i.e., a rear tape) are attached under the polyimide layer.
Disclosure of Invention
The invention provides a flexible display panel for improving residual shadows and a preparation method thereof, and aims to solve the technical problem that the AMOLED display panel in the prior art has residual shadows.
A flexible display panel for improving afterimage, comprising:
the upper surface of the flexible substrate is sequentially provided with a thin film transistor layer and an organic light-emitting layer in a laminated manner;
the protective layer is attached to the lower surface of the flexible substrate and used for reducing the ghost of the flexible display panel; and
a thin film encapsulation layer covering the organic light emitting layer;
the protective layer comprises a glue material layer and a functional structure layer, and the upper surface of the functional structure layer is attached to the lower surface of the flexible substrate through the glue material layer.
Furthermore, the functional structure layer is one of a metal layer and a water-oxygen barrier layer.
Further, the functional structure layer is a laminated structure of a metal layer and a water and oxygen blocking layer, and the upper surface of the metal layer is attached to the lower surface of the flexible substrate through a glue material layer; the lower surface of the metal layer is provided with a water-oxygen barrier layer.
Furthermore, the material of the metal layer is one of copper, aluminum, nickel, silver and titanium, or one of metal oxides of copper, aluminum, nickel, silver and titanium.
Furthermore, the adhesive material layer for bonding the functional structure layer and the flexible substrate is made of optical adhesive or pressure-sensitive adhesive; and/or
The thickness of the rubber layer is 5-25 um.
Further, the protective layer further comprises a substrate layer, and the substrate layer is arranged on the lower surface of the functional structure layer.
Further, the material of the substrate layer is one of polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polymethyl methacrylate and polyimide.
Further, the adhesive tape comprises a back adhesive tape functional layer, and the back adhesive tape functional layer is arranged on the lower surface of the base material layer.
The composite material layer is arranged on the lower surface of the base material layer;
the composite material layer includes a laminated structure composed of one or more of a buffer layer, a graphite layer, and a copper foil layer.
Further, the buffer layer is made of foamed cotton.
A preparation method of a flexible display panel for improving afterimage comprises the following steps:
step S1, providing a flexible substrate with a glass substrate, wherein a thin film transistor layer, an organic light-emitting layer, a thin film packaging layer covering the organic light-emitting layer and a thin film packaging protective film are sequentially stacked on the upper surface of the flexible substrate;
step S2, separating the glass substrate and the flexible substrate by adopting a laser stripping technology;
step S3, providing a protective layer for reducing the residual shadow of the flexible display panel, and bonding the protective layer to the lower surface of the flexible substrate to form a composite structure to be cut;
step S4, cutting the composite structure to be cut to form a panel;
step S5, testing and appearance detecting the panel formed by cutting;
step S6, removing the film packaging protective film on the upper surface of the film packaging layer, and adhering the polarizing film and the touch screen on the upper surface of the film packaging layer;
in step S3, the protective layer includes a glue layer and a functional structure layer, wherein the upper surface of the functional structure layer is attached to the lower surface of the flexible substrate through the glue layer.
Further, the functional structure layer is one of a metal layer and a water-oxygen barrier layer.
The flexible substrate is characterized in that the functional structure layer is a laminated structure of a metal layer and a water-oxygen barrier layer, and the upper surface of the metal layer is attached to the lower surface of the flexible substrate through a glue material layer; the lower surface of the metal layer is provided with a water-oxygen barrier layer.
Furthermore, the material of the metal layer is one of copper, aluminum, nickel, silver and titanium, or one of metal oxides of copper, aluminum, nickel, silver and titanium.
Further, in step S3, the material of the adhesive layer for bonding the functional structure layer and the flexible substrate is optical adhesive or pressure sensitive adhesive; and/or
The thickness of the rubber layer is 5-25 um.
Further, in step S3, the protective layer further includes a substrate layer disposed on the lower surface of the functional structure layer.
Further, the material of the substrate layer is one of polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polymethyl methacrylate and polyimide.
Further, the method also comprises the following steps:
step S7, a back tape functional layer is disposed on the lower surface of the substrate layer.
Further, in step S3, sequentially disposing the protective layer and a composite material layer on the lower surface of the flexible substrate to form a composite structure to be cut;
the composite material layer includes a laminated structure composed of one or more of a buffer layer, a graphite layer, and a copper foil layer.
Further, the buffer layer is made of foamed cotton.
The beneficial technical effects of the invention are as follows: the protective layer is arranged on the lower surface of the flexible substrate, so that the ghost phenomenon of the flexible display panel is effectively improved.
Drawings
FIG. 1 is a diagram illustrating a method for testing the image sticking phenomenon in the prior art;
FIG. 2 is a prior art flexible display panel structure;
FIG. 3 is a diagram illustrating an embodiment of a flexible display panel with improved image sticking;
FIG. 4 is a structural overlay of a functional layer of a backside tape of the present invention;
FIG. 5 is a schematic diagram of another embodiment of a flexible display panel with improved image sticking;
FIG. 6 is a diagram illustrating another embodiment of a flexible display panel with improved image sticking;
FIG. 7 is a diagram illustrating another embodiment of a flexible display panel with improved image sticking;
FIG. 8 is a diagram illustrating another embodiment of a flexible display panel with improved image sticking;
FIG. 9 is a diagram of another embodiment of a flexible display panel with improved image sticking;
FIG. 10 is a flowchart illustrating steps of a method for manufacturing a flexible display panel with improved image sticking according to the present invention;
fig. 11 is a structural diagram of another embodiment of a method for manufacturing a flexible display panel with improved image sticking according to the present invention;
wherein the content of the first and second substances,
1-a flexible substrate;
2-a thin film transistor layer;
3-an organic light-emitting layer;
4-a substrate layer;
5-a back adhesive tape functional layer;
6-thin film encapsulation layer;
7-a glue layer;
8-a metal layer;
9-a support membrane;
10-a water oxygen barrier layer;
11-a buffer layer;
12-a graphite layer;
13-copper foil;
14-a glue layer;
15-grid pattern adhesive tape layer;
16-a substrate layer;
17-a glue layer;
18-a substrate layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
Referring to fig. 3 to 9, the present invention provides a flexible display panel for improving afterimage, including:
the flexible substrate (1), the upper surface of the flexible substrate (1) is sequentially laminated with a thin film transistor layer (2) and an organic light-emitting layer (3);
the protective layer is attached to the lower surface of the flexible substrate (1) and used for reducing the ghost shadow of the flexible display panel; and
a thin film encapsulation layer (6) covering the organic light emitting layer (3);
the protective layer comprises a glue material layer (7) and a functional structure layer, and the upper surface of the functional structure layer is attached to the lower surface of the flexible substrate (1) through the glue material layer (7).
Further, the functional structure layer is one or a combination of a metal layer (8) and a water-oxygen barrier layer (10);
further, the functional structure layer is a laminated structure of a metal layer and a water and oxygen blocking layer, and the upper surface of the metal layer is attached to the lower surface of the flexible substrate through a glue material layer; the lower surface of the metal layer is provided with a water-oxygen barrier layer. That is, as a preferred embodiment, when the functional structure layer includes the metal layer (8) and the water oxygen barrier layer (10), the metal layer (8) may be located on the upper surface of the water oxygen barrier layer (10).
Further, the adhesive layer (7) is made of optical adhesive or pressure-sensitive adhesive, preferably OCA, OCR or conductive adhesive; further preferably, the thickness of the rubber layer is 5-25 um.
Further, the protective layer further comprises a substrate layer (4), and the substrate layer (4) is arranged on the lower surface of the functional structure layer.
Furthermore, the material of the substrate layer (4) is one of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), Polycarbonate (PC), polymethyl methacrylate (PMMA) and Polyimide (PI).
Furthermore, the adhesive tape comprises a back adhesive tape functional layer (5), and the back adhesive tape functional layer (5) is arranged on the lower surface of the base material layer (4).
In another alternative embodiment, the back adhesive tape functional layer (5) can be replaced by a composite material layer, and the composite material layer can be attached to the lower surface of the base material layer (4);
when the composite material layer is used, the base material layer (4) can be optionally not used, and the composite material layer can be attached to the lower surface of the functional structure layer in the embodiment without the base material layer (4).
The composite material layer includes a laminated structure composed of one or more of a buffer layer (11), a graphite layer (12), and a copper foil layer (13).
Preferably, the composite material layer is sequentially laminated with a buffer layer (11), a graphite layer (12) and a copper foil layer (13) from top to bottom.
Further, the buffer layer (11) is made of foamed cotton.
In another preferred embodiment of the present invention, the metal layer (8) is one of copper, aluminum, nickel, silver, titanium, or a metal oxide of copper, aluminum, nickel, silver, titanium. Preferably, the thickness of the metal layer (8) is 15-50 μm.
Preferably, the metal layer (8) is a copper foil.
In another preferred embodiment of the present invention, the water-oxygen barrier layer (10) is an inorganic layer such as SiOx, SiNx, SiON, or the like, or a compound thereof, and preferably a metal oxide such as AlOx, TiOx, or the like.
In another preferred embodiment of the present invention, a glue layer (7) is interposed between the metal layer (8) and the flexible substrate (1). Preferably, the adhesive layer (7) is OCA, OCR, conductive adhesive or the like. Preferably, the thickness of the glue layer (7) is 5-25 μm.
As another preferred embodiment of the present invention, the flexible substrate (1) is a polyimide material (PI material).
In the prior art, the support film (9) attached to the lower surface of the flexible substrate (1) generally comprises a glue material and a base material, the base material is attached to the flexible substrate (1) through the glue material, and no protective layer is arranged, compared with a display panel in the prior art in which a protective layer is not attached to the lower surface of the flexible substrate (1), the display panel has the effect of improving the Image definition of the flexible display panel, because the metal layer (8) can prevent the charge accumulation in the PI or at the PI interface. Structural defects and chemical impurities are inevitably generated during the polyimide manufacturing process, and thus, charges may be generated in the polyimide, and the charge distribution depends on an electric field. Since the voltage potentials of the gate electrode, the source electrode, and the drain electrode vary with the variation in luminance, there may be a variation in an electric field inside the polyimide. In other words, the charge behavior can be changed under three brightness conditions of black, gray, and white. Such variations affect the current flow in the channel layer of the driving TFTs, i.e., cause hysteresis of the TFTs. On the other hand, although the voltage potentials of the gate electrode, the source electrode, and the drain electrode vary with the variation of the luminance condition, the driving TFTs having the metal foil under the polyimide film improve the afterimage to some extent. It is inferred that the electric field generated by the gate electrode, the source electrode, and the drain electrode can be shielded to some extent by the metal foil, and the change in the charge distribution inside the polyimide substrate can be suppressed to some extent.
The flexible substrate (1) (polyimide) is not resistant to external water and oxygen, has certain water absorption characteristics (water absorption of about 1 percent), and external water or hydrogen can move upwards and affect the stability of LTPS TFT and IGZO TFT devices. Especially for IGZO devices in the new type Hybrid TFT (i.e., LTPO) currently used, hydrogen gas or hydrogen ions diffuse into IGZO to undergo a reduction reaction with IGZO, generating carriers to cause a shift in the threshold voltage of the IGZO TFT. When the water-oxygen barrier layer (10) is used as a protective layer, hydrogen or hydrogen ions can be prevented from diffusing into an IGZO device in a Hybrid TFT (LTPO), and the stability of the device is improved.
At present, the support film (9) of the flexible display panel does not have the water and oxygen blocking property, and as a preferred embodiment of the invention, the invention has the function of improving the Image Retention of the flexible display panel to a certain extent by attaching a barrier film with the water and oxygen blocking function on the upper surface of a substrate layer, namely a protective layer is a water and oxygen barrier layer (10). The water oxygen barrier layer (10) has the function of preventing moisture from diffusing into the TFT device, and particularly for LTPO devices, can prevent hydrogen or hydrogen ions from diffusing into the metal oxide TFT (IGZO) from the TFT backboard side and prevent the shift of the threshold voltage Vth.
See 5-7, by metal level (8) and substrate layer (4), or by water oxygen barrier layer (10) and substrate layer (4), or by metal level (8), water oxygen barrier layer (10) and substrate layer (4) range upon range of functional structure layer that constitutes, the functional structure layer that contains metal level (8) has supporting effect and ghost shadow improvement effect concurrently, the functional structure layer that contains water oxygen barrier layer (10) has supporting effect, separation water oxygen function and ghost shadow improvement function, the functional structure layer that contains water oxygen barrier layer (10) and metal level (8) has supporting effect, separation water oxygen function and ghost shadow improvement function.
The adhesive layer (7) has an adhesive effect, and the base material layer (4) has a supporting effect.
In another preferred embodiment of the present invention, the base layer (4) is made of a material such as PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PC (polycarbonate), PMMA (polymethyl methacrylate), PI (polyimide), or the like.
As another preferred embodiment of the invention, when the functional structural layer comprises the metal layer (8) and the water-oxygen barrier layer (10) at the same time, the metal layer (8) is positioned between the flexible substrate (1) and the water-oxygen barrier layer (10), namely, the metal layer (8) is close to the lower surface of the flexible substrate (1).
The functional structure layer is a metal layer (8) or a water-oxygen barrier layer (10) with a water-oxygen barrier function, or a composite layer of the metal layer (8) and the water-oxygen barrier layer (10).
In another preferred embodiment of the invention, the laminated layer of the buffer layer (11), the graphite layer (12) and the copper foil (13) has a film layer similar to a rear tape (5), the laminated layer of the buffer layer (11), the graphite layer (12) and the copper foil (13) or the laminated layer of the base material layer (4), the buffer layer (11), the graphite layer (12) and the copper foil (13) is combined with the protective layer to form a multifunctional composite structure layer, the multifunctional composite structure layer has multiple functions of supporting, improving ghost, buffering, shielding, radiating and the like, the multifunctional composite structure layer is attached to the lower surface of the flexible substrate (1), the multiple functions of supporting, improving ghost, buffering, shielding, radiating and the like can be realized, the preparation process of the flexible display panel can be simplified, the thickness of the flexible display panel can be reduced, and the cost can be reduced.
In another preferred embodiment of the invention, Foam which is the buffer layer (11) mainly plays a buffer role, the substrate layer (4) is used as a carrier for Foam, the graphite layer (12) has a shielding role, the copper foil (13) has a heat dissipation role, and the adhesive layer (14) is double-sided adhesive, so that the two objects to be pasted are attached.
In another preferred embodiment of the invention, Foam which is the buffer layer (11) is Foam and mainly plays a buffer role, Foam material is directly arranged on the second surface of the metal layer (8), the graphite layer (12) has a shielding role, the copper foil (13) has a heat dissipation role, the adhesive layer (14) is double-sided adhesive, so that the objects to be pasted are pasted, and the flexible display panel is thinner because the base material layer (4) is omitted.
The invention also provides a preparation method of the flexible display panel for improving the afterimage, which comprises the following steps:
step S1, providing a flexible substrate (1) with a glass substrate, and sequentially laminating a thin film transistor layer (2), an organic light-emitting layer (3) and a thin film packaging layer (6) covering the organic light-emitting layer (3) on the upper surface of the flexible substrate (1);
step S2, separating the glass substrate and the flexible substrate (1) by adopting a laser stripping technology;
step S3, providing a protective layer for reducing the residual shadow of the flexible display panel, and attaching the protective layer to the lower surface of the flexible substrate (1) to form a composite structure to be cut;
step S4, cutting the composite structure to be cut to form a panel; that is, in the cutting process (cell cutting), a whole large board is cut into a panel suitable for a predetermined required size.
Step S5, carrying out quality detection on the panel formed by cutting, including appearance detection and other quality tests;
step S6, removing the film packaging protective film on the upper surface of the film packaging layer (6), and adhering the polarizing film and the touch screen on the upper surface of the film packaging layer; the method belongs to the bias attaching and binding process, namely, a protective film (release film) is removed, a bias light film is attached to a thin film packaging layer (6), COF/IC and FPC binding is carried out, and relevant panel detection is carried out after step S6.
In step S3, the protective layer includes a glue layer (7) and a functional structure layer, wherein the upper surface of the functional structure layer is attached to the lower surface of the flexible substrate through the glue layer.
Preferably, the functional structure layer is one or a combination of a metal layer (8) and a water-oxygen barrier layer (10);
the functional structure layer is a laminated structure of a metal layer and a water-oxygen barrier layer, and the upper surface of the metal layer (8) is attached to the lower surface of the flexible substrate through a glue material layer; the lower surface of the metal layer (8) is provided with a water and oxygen barrier layer. As a preferred embodiment, when the functional structural layer comprises a metal layer (8) and a water oxygen barrier layer (10), the metal layer (8) may be located on the upper surface of the water oxygen barrier layer (10).
Furthermore, the material of the metal layer (8) is one of copper, aluminum, nickel, silver and titanium, or one of metal oxides of copper, aluminum, nickel, silver and titanium.
Further, in step S3, the material of the adhesive material layer (7) for bonding the functional structure layer and the flexible substrate is optical adhesive or pressure sensitive adhesive, preferably, transparent optical adhesive OCA, liquid optical adhesive OCR or conductive adhesive material; in addition, as a preferable embodiment, the thickness of the adhesive layer (7) is 5-25 um.
As another preferred embodiment of the present invention, the back tape functional layer (5) has a structure as shown in fig. 4, and the back tape functional layer (5) is formed by laminating a latticed tape layer (15) (EMBO), a cushion layer (11), a base layer (16), a glue layer (14), a graphite layer (12), and a copper foil (13) (self-adhesive) in this order. EMBO (grid line sticky tape) has laminating exhaust effect, makes the attached panel of rear tape on, and buffer layer (11) is Foam for Foam promptly, mainly plays the cushioning effect, and substrate layer (16) are as the carrier that the Foam was foamed, and graphite layer (12) have the shielding effect, and copper foil (13) have the heat dissipation effect, and second adhesive tape layer (14) are the double faced adhesive tape, make and are pasted thing both attached.
Further, the protective layer further comprises a substrate layer (4), and the substrate layer (4) is arranged on the lower surface of the functional structure layer.
Further, the material of the substrate layer is one of polyethylene terephthalate (PET), polyethylene naphthalate (PEN), Polycarbonate (PC), polymethyl methacrylate (PMMA) and Polyimide (PI).
Further, the method also comprises the following steps:
in step S7, a back tape functional layer is attached to the lower surface of the base material layer.
In another alternative embodiment, the back adhesive tape functional layer (5) can be replaced by a composite material layer, and the composite material layer can be attached to the lower surface of the base material layer (4); when the composite material layer is used, the base material layer (4) is optionally not used, and in the embodiment without the base material layer (4), the composite material layer is directly arranged on the lower surface of the functional structure layer.
In step S3, the protective layer and a composite material layer are sequentially disposed on the lower surface of the flexible substrate to form a composite structure to be cut. Forming a composite material layer on the lower surface of the base material layer of the protective layer or the lower surface of the functional structure layer to form a composite structure to be cut; the composite material layer includes a laminated structure composed of one or more of a buffer layer (11), a graphite layer (12), and a copper foil layer (13).
Preferably, the composite material layer is sequentially laminated with a buffer layer (11), a graphite layer (12) and a copper foil (13) layer from top to bottom.
As a preferred embodiment of the present invention, in the step S3, the protective layer and the composite material layer are laminated together and then attached to the lower surface of the flexible substrate.
Further, the buffer layer (11) is made of foamed cotton.
As another preferred embodiment of the present invention, when the protective layer comprises both the metal layer (8) and the water-oxygen barrier layer (10), the metal layer (8) is located between the flexible substrate (1) and the water-oxygen barrier layer (10), i.e. the metal layer (8) is adjacent to the lower surface of the flexible substrate (1).
In another preferred embodiment of the present invention, a glass substrate is prepared, a flexible substrate (1) is formed on the glass substrate, and the thin film transistor layer (2) and the organic light-emitting layer (3) formed thereon and a thin film encapsulation layer (6) covering the organic light-emitting layer (3) are sequentially stacked on the upper surface of the flexible substrate (1). In step S2, a protective film is attached to the surface of the film sealing layer (6) to protect the film sealing layer (6). After the protective film is pasted, the flexible substrate (1) is separated from the glass substrate by adopting a laser release technology, the protective layer is attached to the lower surface of the flexible substrate (1) in an exposed mode, and the protective film is a release film.
Specifically, the cutting is performed by means of laser. And after the panel semi-finished product is formed by cutting, the protective film is torn off, and POL and TP are attached to the film packaging layer (6).
Specifically, the metal layer (8) does not have a good supporting function, so that a base material layer (18) and a rubber material layer (17) are prepared to be attached to the lower surface of the metal layer (8), and the upper surface of the metal layer (8) is attached to the lower surface of the flexible substrate (1) through the rubber material layer (7). After the metal layer (8) is attached, after subsequent laser cutting, the base material layer (18) and the adhesive material layer (17) are torn off before the rear tape (5) is attached, and then the rear tape functional layer rear tape (5) is attached, so that the overall thickness of the flexible display panel is reduced, and the light and thin characteristic is achieved.
The adhesive force of the adhesive layer (17) is low, lower than 3gf/25mm, and is easy to remove. The adhesive force of the adhesive layer (7) is high and is more than 750gf/25 mm.
Specifically, the cutting is performed by means of laser. After the panel semi-finished product is cut and formed in the step S3 and the test and appearance detection are carried out in the step S4, the method also comprises the steps of tearing off the protective film and attaching POL and TP to the film packaging layer (6).
By metal level (8) and substrate layer (4), or by water oxygen barrier layer (10) and substrate layer (4), or by metal level (8), water oxygen barrier layer (10) and substrate layer) (4) range upon range of and the functional structure layer that constitutes, the functional structure layer that contains metal level (8) has supporting role and ghost shadow improvement effect concurrently, the functional structure layer that contains water oxygen barrier layer (10) has supporting role, separation water oxygen function and ghost shadow improvement function, the functional structure layer that contains water oxygen barrier layer (10) and metal level (8) has supporting role, separation water oxygen function and ghost shadow improvement function. Specifically, the functional structure layer is attached to the flexible substrate (1) through the adhesive layer (7).
Specifically, the cutting is performed by means of laser. And plating a metal layer (8) on the substrate layer (4) in a film plating mode, tearing off the protective film after cutting to form a panel semi-finished product, and attaching POL and TP to the film packaging layer (6).
Specifically, the cutting is performed by means of laser. And after the panel semi-finished product is formed by cutting, the protective film is torn off, and POL and TP are attached to the film packaging layer (6).
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (20)
1. A flexible display panel for improving afterimage is characterized by comprising
The upper surface of the flexible substrate is sequentially provided with a thin film transistor layer and an organic light-emitting layer in a laminated manner;
the protective layer is attached to the lower surface of the flexible substrate and used for reducing the ghost of the flexible display panel; and
a thin film encapsulation layer covering the organic light emitting layer;
the protective layer comprises a glue material layer and a functional structure layer, and the upper surface of the functional structure layer is attached to the lower surface of the flexible substrate through the glue material layer.
2. The flexible display panel for improving image sticking as claimed in claim 1, wherein the functional structure layer is one of a metal layer and a water-oxygen barrier layer.
3. The flexible display panel for improving image sticking as claimed in claim 1, wherein the functional structure layer is a laminated structure of a metal layer and a water and oxygen barrier layer, and an upper surface of the metal layer is attached to a lower surface of the flexible substrate through the adhesive layer; the lower surface of the metal layer is provided with the water and oxygen barrier layer.
4. The flexible display panel for improving image sticking as claimed in claim 2 or 3, wherein the material of the metal layer is one of copper, aluminum, nickel, silver and titanium, or one of metal oxides of copper, aluminum, nickel, silver and titanium.
5. The flexible display panel for improving image sticking as claimed in claim 1, wherein the adhesive layer for bonding the functional structure layer and the flexible substrate is made of optical adhesive or pressure sensitive adhesive; and/or
The thickness of the rubber layer is 5-25 um.
6. The flexible display panel for improving image sticking as claimed in claim 1, wherein the protective layer further comprises a substrate layer disposed on a lower surface of the functional structure layer.
7. The flexible display panel for improving image sticking as claimed in claim 6, wherein the material of the substrate layer is one of polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polymethyl methacrylate and polyimide.
8. The flexible display panel for improving image sticking as claimed in claim 6, further comprising a back tape functional layer bonded to a lower surface of the substrate layer.
9. The flexible display panel for improving image sticking as claimed in claim 6, further comprising a composite layer disposed on a lower surface of the substrate layer;
the composite material layer comprises a laminated structure formed by one or more of a buffer layer, a graphite layer and a copper foil layer.
10. The flexible display panel for improving image sticking as claimed in claim 9, wherein the buffer layer is a foam cotton.
11. A preparation method of a flexible display panel for improving afterimage is characterized by comprising the following steps:
step S1, providing a flexible substrate with a glass substrate, wherein a thin film transistor layer, an organic light-emitting layer, a thin film packaging layer covering the organic light-emitting layer and a thin film packaging protective film are sequentially stacked on the upper surface of the flexible substrate;
step S2, separating the glass substrate and the flexible substrate by adopting a laser stripping technology;
step S3, providing a protective layer for reducing the residual shadow of the flexible display panel, and attaching the protective layer to the lower surface of the flexible substrate to form a composite structure to be cut;
step S4, cutting the composite structure to be cut to form a panel;
step S5, performing quality inspection on the panel formed by cutting;
step S6, removing the film packaging protective film on the upper surface of the film packaging layer, and adhering a polarizing film and a touch screen on the upper surface of the film packaging layer;
in step S3, the protective layer includes a glue layer and a functional structure layer, wherein an upper surface of the functional structure layer is attached to a lower surface of the flexible substrate through the glue layer.
12. The method as claimed in claim 11, wherein the functional structure layer is one of a metal layer and a water-oxygen barrier layer.
13. The method as claimed in claim 11, wherein the functional structure layer is a laminated structure of a metal layer and a water-oxygen barrier layer, and an upper surface of the metal layer is attached to a lower surface of the flexible substrate through the adhesive layer; the lower surface of the metal layer is provided with the water and oxygen barrier layer.
14. The method as claimed in claim 12, wherein the metal layer is made of one of copper, aluminum, nickel, silver and titanium, or one of metal oxides of copper, aluminum, nickel, silver and titanium.
15. The method as claimed in claim 11, wherein in step S3, the adhesive layer for bonding the functional structure layer and the flexible substrate is made of an optical adhesive or a pressure sensitive adhesive; and/or
The thickness of the rubber layer is 5-25 um.
16. The method as claimed in claim 11, wherein in step S3, the protective layer further includes a substrate layer disposed on a lower surface of the functional structure layer.
17. The method according to claim 16, wherein the substrate layer is made of one of polyethylene terephthalate, polyethylene naphthalate, polycarbonate, polymethyl methacrylate, and polyimide.
18. The method for manufacturing the flexible display panel for improving the image sticking as claimed in claim 16, further comprising:
step S7, a back tape functional layer is attached to the lower surface of the substrate layer.
19. The method as claimed in claim 16, wherein in step S3, the protective layer and a composite material layer are sequentially disposed on the lower surface of the flexible substrate to form a composite structure to be cut;
the composite material layer comprises a laminated structure formed by one or more of a buffer layer, a graphite layer and a copper foil layer.
20. The method as claimed in claim 19, wherein the buffer layer is a foam.
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