CN111162203A - Back film and preparation method thereof, flexible display device and preparation method thereof, and cutting die - Google Patents

Back film and preparation method thereof, flexible display device and preparation method thereof, and cutting die Download PDF

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Publication number
CN111162203A
CN111162203A CN202010002060.2A CN202010002060A CN111162203A CN 111162203 A CN111162203 A CN 111162203A CN 202010002060 A CN202010002060 A CN 202010002060A CN 111162203 A CN111162203 A CN 111162203A
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China
Prior art keywords
blade
back film
partial
backsheet
film
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Granted
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CN202010002060.2A
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Chinese (zh)
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CN111162203B (en
Inventor
王格
蒋志亮
漆飞
文平
王裕
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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Priority to CN202010002060.2A priority Critical patent/CN111162203B/en
Publication of CN111162203A publication Critical patent/CN111162203A/en
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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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • 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
    • H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • 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

Abstract

The embodiment of the invention provides a back film and a preparation method thereof, a flexible display device and a preparation method thereof, and a cutting die, relates to the technical field of display, and can solve the problem that the cutting edge of a first part of back film is uneven due to partial deletion of the cutting edge of the first part of back film, and the back film comprises a bearing layer; and a first portion of the backing film and a second portion of the backing film; the first partial back film and the second partial back film are arranged on the same surface of the bearing layer in a peelable mode and are arranged side by side, a space is reserved between the first partial back film and the second partial back film, and the side, close to the second partial back film, of the first partial back film is perpendicular to the surface, far away from the bearing layer, of the first partial back film. For use in flexible display devices.

Description

Back film and preparation method thereof, flexible display device and preparation method thereof, and cutting die
Technical Field
The invention relates to the technical field of display, in particular to a back film and a preparation method thereof, a flexible display device and a preparation method thereof, and a cutting die.
Background
An OLED (Organic Light-Emitting Diode) flexible display device has the advantages of small size, portability, capability of realizing bending and folding, narrow frame and the like, and thus becomes the mainstream development trend of the display device at present.
The main structure of the flexible display device includes a back film, a flexible substrate, a flexible display panel, a control chip (IC), and the like. In order to realize a narrower lower frame of the flexible display device, a Pad bending (Pad bending) mode of the flexible substrate is usually adopted to bend one side of the attachment IC to the back of the flexible display Panel (Panel), so that when the flexible substrate is bent, the back film is arranged on the back of the flexible substrate, and therefore the back film can provide a supporting force for the flexible substrate, so as to achieve a better bending effect.
However, since the bending of the pad region of the flexible substrate is a 180-degree bending, the film layer in the flexible display panel is easily cracked and separated in the bending region, in this case, the removal of the back film in the bending region of the flexible substrate can reduce the bending stress and improve the occurrence of cracks, and the back film after the removal of part of the back film in the bending region is called a patterned (Pattern) back film.
Disclosure of Invention
The embodiment of the invention provides a back film and a preparation method thereof, a flexible display device and a preparation method thereof, and a cutting die, which can solve the problem that the cutting edge of a first part of back film is uneven due to partial deletion of the cutting edge of the first part of back film.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, a backsheet is provided, comprising a carrier layer; and a first portion of the backing film and a second portion of the backing film; the first partial back film and the second partial back film are arranged on the same surface of the bearing layer in a peelable mode and are arranged side by side, a space is reserved between the first partial back film and the second partial back film, and the side, close to the second partial back film, of the first partial back film is perpendicular to the surface, far away from the bearing layer, of the first partial back film.
In some embodiments, a side of the second portion of the backsheet near a side of the first portion of the backsheet is perpendicular to a surface of the second portion of the backsheet distal from the carrier layer.
In some embodiments, further comprising: a third portion of the backing film; the third partial backsheet is releasably disposed on the surface of the carrier layer between the first partial backsheet and the second partial backsheet.
In a second aspect, there is provided a cutting die comprising: a first blade; the first blade has a first blade edge; and a second blade; the second blade is provided with a second blade edge, the second blade is fixedly connected with the first blade, and the first blade edge and the second blade edge are oppositely arranged along the thickness direction of the first blade; along the cutting direction of the first blade and the second blade, the side surface of the first blade far away from the second blade is a vertical surface, and the side surface of the first blade near the second blade is an inclined surface.
In some embodiments, a side surface of the second blade on a side far away from the first blade is a vertical surface, and a side surface of the second blade on a side close to the first blade is a bevel surface.
In some embodiments, the first blade further comprises a first blade body, the second blade further comprises a second blade body, the first blade body is fixedly connected with the second blade body, the first blade edge is positioned at the front end of the first blade body, and the second blade edge is positioned at the front end of the second blade body; the side surface of the first blade far away from the second blade is parallel to or in the same plane with the side surface of the first blade far away from the second blade.
In some embodiments, a side of the second blade distal from the first blade is parallel to or in the same plane as a side of the second blade distal from the first blade.
In a third aspect, there is provided a flexible display device comprising: a display element; a flexible substrate; the display element is disposed on the flexible substrate, and a region of the flexible substrate where the display element is not disposed includes: the flexible substrate is provided with a turnover area and a bending area, and the part of the flexible substrate, which is positioned in the turnover area, is turned to the back of the display element through the part of the flexible substrate, which is positioned in the bending area; and a first portion of the backing film and a second portion of the backing film; the first partial backing film and the second partial backing film are disposed on a back side of the flexible substrate; the side surface of the first part of back film close to one side of the bending area is a vertical surface, and the boundary of the first part of back film close to one side of the bending area is beyond the boundary of the display element close to one side of the bending area; alternatively, a boundary of a side of the first partial back film close to the bending region is aligned with a boundary of a side of the display element close to the bending region.
In some embodiments, a side surface of the second partial back film on a side close to the bending region is a vertical surface, and a boundary of the second partial back film on a side close to the bending region is outside a boundary of the display element on a side close to the bending region; alternatively, the boundary of the second partial back film on the side close to the bending region is aligned with the boundary of the display element close to the bending region.
In a fourth aspect, a method for preparing a back film is provided, which includes: the back film to be cut includes: the cutting device comprises a bearing layer and a layer to be cut, wherein the layer to be cut is arranged on the bearing layer; placing the first cutting edge and the second cutting edge of the cutting die vertically to the surface of the side, away from the bearing layer, of the layer to be cut along the cutting direction; cutting the layer to be cut to form a back film, wherein the back film comprises: a first partial backsheet, a second partial backsheet, and a third partial backsheet disposed between the first partial backsheet and the second partial backsheet.
In some embodiments, the backing film comprises: a first portion of a backsheet and the second portion of a backsheet with a space therebetween.
In a fifth aspect, a method for manufacturing a flexible display device is provided, including: attaching a first portion of a back film and a second portion of the back film included in the back film to a side of the flexible substrate facing away from the display element; removing the bearing layer; folding the part of the flexible substrate positioned in the folding area to the back surface of the display element through the part positioned in the bending area; or, removing a third portion of the backing film comprised by the backing film; attaching a first portion of the back film and a second portion of the back film from which the third portion of the back film is removed to a side of the flexible substrate facing away from the display element; removing the bearing layer; and folding the part of the flexible substrate positioned in the folding area to the back surface of the display element through the part positioned in the bending area.
The embodiment of the invention provides a back film and a preparation method thereof, a flexible display device and a preparation method thereof, and a cutting die, wherein the back film comprises a bearing layer; and a first portion of the backing film and a second portion of the backing film; the first part of back film and the second part of back film are arranged on the same surface of the bearing layer in a peelable and side-by-side mode, a space is reserved between the first part of back film and the second part of back film, and the side, close to the second part of back film, of the first part of back film is perpendicular to the surface, far away from the bearing layer, of the first part of back film. In the embodiment of the invention, the side surface of the first part of the back film close to the second part of the back film is perpendicular to the surface of the first part of the back film far from the bearing layer, that is, the side surface of the first part of the back film close to the second part of the back film is a vertical surface, so that the side surface edge of the first part of the back film in the formed back film can be flush.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a first schematic structural diagram of a back film according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a back film provided in the related art;
fig. 3 is a schematic structural diagram of a back film according to an embodiment of the present invention;
fig. 4 is a first schematic structural diagram of a cutting die according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a cutting die provided in the related art;
fig. 6 is a schematic structural view illustrating a structure of cutting a back film to be cut by using the cutting die shown in fig. 5 in the related art;
fig. 7 is a schematic structural diagram of a cutting die according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram illustrating a structure of cutting a back film to be cut by using the cutting die shown in FIG. 7 according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a flexible display device according to an embodiment of the present invention before bending;
fig. 10 is a schematic structural diagram of a flexible display device according to an embodiment of the present invention after being bent;
fig. 11 is a schematic structural diagram of a flexible display device according to an embodiment of the present invention;
fig. 12 is a schematic diagram illustrating region division of a display panel according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a substrate for display according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of a flexible display device provided in the related art before bending;
fig. 15 is a schematic structural view of a flexible display device provided in the related art after being bent;
fig. 16 is a schematic flow chart of a process for preparing a back film according to an embodiment of the present invention;
fig. 17 is a first schematic flowchart illustrating a process of manufacturing a flexible display device according to an embodiment of the present invention;
fig. 18 is a schematic view of a second process for manufacturing a flexible display device according to an embodiment of the present invention.
Reference numerals:
011-light emitting area; 012-a non-light emitting area; 01-a display area; 02-a peripheral zone; 1-a frame; 2-cover glass; 3-a display panel; 4-a circuit board; 5-a control circuit; 10-a backing film; 11-a carrier layer; 12-a cutting die; 13-a display element; 14-a flexible substrate; 31-a substrate for display; 32-an encapsulation layer; 101-a first portion of a backing film; 102-a second partial backsheet; 103 a third portion of the backing film; 121-a first blade; 122-a second blade; 141-a turnover zone; 142-a bending zone; 310-a thin film transistor; 311-an anode; 312-a light emitting functional layer; 313-a cathode; 314-pixel definition layer; 315-a planarization layer; 1211 — a first blade edge; 1221-a second blade edge; 1212-a first blade; 1222-a second blade.
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.
An embodiment of the present invention provides a back film 10, as shown in fig. 1, where the back film 10 includes a carrier layer 11; and a first portion of backing film 101 and a second portion of backing film 102; the first partial back film 101 and the second partial back film 102 are arranged on the same surface of the bearing layer 11 in a peelable manner side by side, and a space is formed between the first partial back film 101 and the second partial back film 102, and the side of the first partial back film 101 close to the second partial back film 102 is perpendicular to the surface of the first partial back film far away from the bearing layer 11.
It should be understood that the carrier layer 11 includes an upper surface and a lower surface, the first partial backsheet 101 and the second partial backsheet 101 are disposed side by side on the same surface of the carrier layer 11, and it may be that the first partial backsheet 101 and the second partial backsheet 101 are disposed on the upper surface of the carrier layer 11 at the same time; it is also possible that the first portion 101 of the backing film and the second portion 101 of the backing film are both provided on the lower surface of the carrier layer.
The material of the carrier layer 11 is not limited. As an example, the material of the carrier layer 11 may be an organic material; and may be an inorganic material. Here, the organic material may be, for example, PMMA (Polymethyl methacrylate); the inorganic material may be, for example, one or more of SiNx (silicon nitride), SiOx (silicon oxide), or SiOxNy (silicon oxynitride).
The arrangement of the first partial backsheet 101 and the second partial backsheet 102 on the carrier layer 11 is not limited, and the first partial backsheet 101 and the second partial backsheet 101 can be peeled off from the surface of the carrier layer 11. In some embodiments, the first portion of the backing film 101 and the second portion of the backing film 101 are electrostatically bonded to the carrier layer 11. In other embodiments, the back film 10 further includes an adhesive film disposed between the carrier layer 11 and the first and second partial back films 101 and 102, and the first and second partial back films 101 and 102 are attached to the carrier layer 11 through the adhesive film. The glue film is not shown in figure 1.
In the embodiment of the present invention, the material of the first partial back film 101 and the second partial back film 102 is the same, and in this case, the material of the first partial back film 101 and the second partial back film 102 is not limited. For example, the material of the first and second partial back films 101 and 102 may be one of a Polyethylene terephthalate (PET), a Polyimide (PI), or a Cyclic Olefin Polymer (COP).
The related art provides a back film 10, as shown in fig. 2, the back film 10 includes a carrier layer 11; and a first portion of backing film 101 and a second portion of backing film 102; the first partial back film 101 and the second partial back film 102 are arranged on the same surface of the carrier layer 11 in a peelable manner, and a space is formed between the first partial back film 101 and the second partial back film 102, the side of the first partial back film 101 close to the second partial back film 102 is an inclined surface, and the side of the second partial back film 102 close to the first partial back film 101 is an inclined surface. Since the side of the first partial backsheet 101 close to the second partial backsheet 102 in the related art is an inclined surface and the side of the second partial backsheet 102 close to the first partial backsheet 101 is an inclined surface, that is, the side edge of the first partial backsheet 101 close to the second partial backsheet 102 and the side edge of the second partial backsheet 102 close to the first partial backsheet 101 are partially missing, the side edges of the first partial backsheet 101 and the second partial backsheet 102 in the backsheet 10 are not flush.
The embodiment of the invention provides a back film 10, wherein the back film 10 comprises a bearing layer 11; and a first portion of backing film 101 and a second portion of backing film 102; the first partial back film 101 and the second partial back film 102 are arranged on the same surface of the bearing layer 11 in a peelable manner side by side, and a space is formed between the first partial back film 101 and the second partial back film 102, and the side of the first partial back film 101 close to the second partial back film 102 is perpendicular to the surface of the first partial back film far away from the bearing layer 11. Since the side surface of the first partial back film 101 close to the second partial back film 102 in the embodiment of the present invention is perpendicular to the surface of the first partial back film away from the carrier layer 11, that is, the side surface of the first partial back film 101 close to the second partial back film 102 is a vertical surface, in this way, the side surface edge of the first partial back film 101 in the formed back film 10 can be flush.
In some embodiments, as shown in fig. 1, the side of the second partial backsheet 102 adjacent to the first partial backsheet 101 is perpendicular to the surface of the second partial backsheet 102 away from the carrier layer 11.
Since the side of the second partial backsheet 101 close to the first partial backsheet 102 is perpendicular to the surface of the second partial backsheet far from the carrier layer 11 in the embodiment of the present invention, that is, the side of the second partial backsheet 101 close to the first partial backsheet 102 is a vertical surface, the side of the second partial backsheet 101 close to the first partial backsheet 102 is not missing, and thus, the side edges of the first partial backsheet 101 and the second partial backsheet 102 of the formed backsheet 10 can be further made to be flush.
In some embodiments, as shown in fig. 3, the backsheet 10 further includes a third portion backsheet 103; the third partial backsheet 103 is releasably disposed on the surface of the carrier layer 11 between the first partial backsheet 101 and the second partial backsheet 102.
Here, the third partial backsheet 103 is disposed side by side with the first partial backsheet 101 and the second partial backsheet 102 on the same surface of the carrier layer 11. On the basis, the materials of the third part back film 103, the first part back film 101 and the second part back film 102 are all one of PET, PI or COP.
The arrangement between the third partial backsheet 103 and the carrier layer 11 is not limited. The third partial backsheet 103 is arranged on the carrier layer 11 in the same way as the first and second partial backsheet 101, 102 are arranged on the carrier layer 11. Reference may be made to the arrangement of the first partial back film 101 and the second partial back film 102 on the carrier layer 11, and details are not described here.
The embodiment of the invention further provides a cutting die 12 for cutting the back film 10. As shown in fig. 4, the cutting die 12 includes a first blade 121; the first blade 121 has a first blade edge 1211; and a second blade 122; the second blade 122 has a second blade edge 1221, the second blade 122 is fixedly connected to the first blade 121, and the first blade edge 1211 and the second blade edge 1221 are disposed opposite to each other in the thickness direction of the first blade 121; in the cutting direction of the first blade 1211 and the second blade 1221, the side of the first blade 1211 on the side away from the second blade 1221 is a vertical surface, and the side of the first blade 1211 on the side close to the second blade 1221 is a bevel surface.
It will be understood by those skilled in the art that since the first blade 1211 and the second blade 1221 each have a blade angle, that is, an included angle is formed between a side of the first blade 1211 facing away from the second blade 1221 and a side of the first blade 1211 facing away from the second blade 1221, when the side of the first blade 1211 facing away from the second blade 1221 is a vertical side, the side of the first blade 1211 facing away from the second blade 1221 is a slanted side. On this basis, the smaller the blade angle of the first blade 1211 and the second blade 1221, the sharper the first blade 1211 and the second blade 1221 are, and thus the less force a user applies during cutting of the first blade 1211 and the second blade 1221.
The manner in which the second blade 122 is fixedly connected to the first blade 121 is not limited. In some embodiments, the second blade 122 includes a second engaging portion, the first blade includes a first engaging portion, and the second blade 122 and the first blade 121 are fixedly connected by the second engaging portion and the first engaging portion. In other embodiments, the second blade 122 and the first blade 121 are fixedly connected by screws.
The related art provides a cutting die 12, as shown in fig. 5, the cutting die 12 includes a first blade 121; the first blade 121 has a first blade edge 1211; and a second blade 122; the second blade 122 has a second blade edge 1221, the second blade 122 is fixedly connected to the first blade 121, and the first blade edge 1211 and the second blade edge 1221 are disposed opposite to each other in the thickness direction of the first blade 121; in the cutting direction of the first blade 1211 and the second blade 1221, the side of the first blade 1211, which is far from the second blade 1221, is a bevel, and the side of the first blade 1211, which is near to the second blade 1221, is a bevel; the side of the second blade 1221 away from the first blade 1211 is beveled, and the side of the second blade 1221 near the first blade 1211 is beveled. Since in the related art, in the cutting direction of the first blade 1211 and the second blade 1221, the side of the first blade 1211 on the side away from the second blade 1221 is a bevel, and the side of the first blade 1211 on the side close to the second blade 1221 is a bevel; the side of the second blade 1221 away from the first blade 1211 is a bevel, and the side of the second blade 1221 close to the first blade 1211 is a bevel, so that after the back film to be cut is cut by using the cutting die 12 provided in the related art, a side edge of the first portion of the back film 101 close to the second portion of the back film 102 and a side edge of the second portion of the back film 102 close to the first portion of the back film 101 of the formed back film 10 have a part of oblique cutting marks, so that a cutting edge of the first portion of the back film 101 close to the second portion of the back film 102 is not flush with a cutting edge of the second portion of the back film 102 close to the first portion of the back film 101.
Referring to fig. 6, the cut edges of the first partial backsheet 101 and the second partial backsheet 102 may be partially slanted with a knife mark due to the cutting of the cutting die 12, and the film layers of the side edges of the first partial backsheet 101 close to the second partial backsheet 102 and the side edges of the second partial backsheet 102 close to the first partial backsheet 101 are partially missing. As shown in fig. 6, the oblique tool marks L at the side edge of the first partial back film 101 close to the second partial back film 102 and the side edge of the second partial back film 102 close to the first partial back film 101 range from 30um to 70 um.
The embodiment of the present invention provides a cutting die 12, where the cutting die 12 includes a first blade 121; the first blade 121 has a first blade edge 1211; and a second blade 122; the second blade 122 has a second blade edge 1221, the second blade 122 is fixedly connected to the first blade 121, and the first blade edge 1211 and the second blade edge 1221 are disposed opposite to each other in the thickness direction of the first blade 121; in the cutting direction of the first blade 1211 and the second blade 1221, the side of the first blade 1211 on the side away from the second blade 1221 is a vertical surface, and the side of the first blade 1211 on the side close to the second blade 1221 is a bevel surface. Since the cutting die 12 provided by the embodiment of the present invention has the side surface of the first cutting edge 1211 away from the second cutting edge 1221 in the cutting direction along the first cutting edge 1211 and the second cutting edge 1221 as a vertical surface, and the side surface of the first cutting edge 1211 close to the second cutting edge 1221 as a bevel surface, after the back film to be cut is cut by using the cutting die 12 provided by the embodiment of the present invention, the cutting mark of the side surface edge of the first partial back film 101 is vertical, and thus the side surface of the first partial back film 101 close to the second partial back film 102 of the formed back film 10 is a vertical surface, so that the side surface edge of the first partial back film 101 close to the second partial back film 102 can be flush.
In some embodiments, as shown in fig. 4, the side of the second blade 1221 away from the first blade 1211 is a vertical surface, and the side of the second blade 1221 near the first blade 1211 is a sloped surface.
In the embodiment of the present invention, because the side surface of the second blade 1221 away from the first blade 1211 is a vertical surface and the side surface of the second blade 1221 close to the first blade 1211 is a slope surface along the cutting direction of the first blade 1211 and the second blade 1221, after the back film to be cut is cut by using the cutting die 12 provided by the embodiment of the present invention, the side surface of the second partial back film 102 of the back film 10 close to the first partial back film 101 is formed as a vertical surface, so that the edge of the side surface of the second partial back film 102 close to the first partial back film 101 can be flush.
Referring to fig. 8, after the back film to be cut is cut by using the cutting die 12 provided in the embodiment of the present invention, the cut edges of the first part back film 101 and the second part back film 102 of the back film 12 are vertical, and the film layers of the side surface of the first part back film 101 close to the second part back film 102 and the side surface edge of the second part back film 102 close to the first part back film 101 are complete.
As shown in fig. 7, the first blade 121 further includes a first blade 1212, the second blade 122 further includes a second blade 1222, the first blade 1212 is fixedly connected to the second blade 1222, the first blade 1211 is located at a front end of the first blade 1212, and the second blade 1221 is located at a front end of the second blade 1222; the side of the first blade 1212 facing away from the second blade 1222 is parallel or in the same plane as the side of the first blade 1211 facing away from the second blade 1221.
The manner in which the first blade body 1212 is fixedly connected to the second blade body 1222 is not limited. In some embodiments, the first blade body 1212 includes a first engagement portion, the second blade body 1222 includes a second engagement portion, and the first blade body 1212 and the second blade body 1222 are fixedly engaged with each other by the first engagement portion and the second engagement portion. In other embodiments, the first blade 1212 and the second blade 1222 are fixedly coupled by screws.
It should be noted that the first blade 1211 and the second blade 1221 are used to cut a back membrane to be cut, when the first blade 1211 and the second blade 1221 are placed perpendicular to the back membrane to be cut, the first blade 1211 and the second blade 1221 are close to an upper surface of the back membrane to be cut, and the first blade 1212 and the second blade 1222 are used to fix the first blade 1211 and the second blade 1221 to cut the back membrane to be cut, so that the first blade 1211 and the second blade 1221 are disposed at front ends of the first blade 1212 and the second blade 1222. While the rear ends of the first and second blades 1212, 1222 serve to fixedly connect the first and second blades 121, 122 to form the die 12.
Here, in the case where the side of the first blade body 1212 on the side away from the second blade body 1222 is parallel to the side of the first blade edge 1211 on the side away from the second blade edge 1221, it may be that the boundary of the side edge of the first blade body 1212 on the side away from the second blade body 1222 is out of the boundary of the side edge of the first blade edge 1211 on the side away from the second blade edge 1221; it is also possible that the side edge of the first blade 1212 on the side away from the second blade 1222 is bounded inwardly of the side edge of the first blade 1211 on the side away from the second blade 1221. In the case where the side of the first blade body 1212 on the side away from the second blade body 1222 is in the same plane as the side of the first blade edge 1211 on the side away from the second blade edge 1221, the boundary of the side edge of the first blade body 1212 on the side away from the second blade body 1222 is aligned with the boundary of the side edge of the first blade edge 1211 on the side away from the second blade edge 1221.
In some embodiments, as shown in FIG. 7, the side of the second blade 1222 distal from the first blade 1212 is parallel to or in the same plane as the side of the second blade 1221 distal from the first blade 1211.
Here, in the case where the side of the second blade 1222 on the side away from the first blade 1212 is parallel to the side of the second blade 1221 on the side away from the first blade 1211, it may be that the boundary of the side edge of the second blade 1222 on the side away from the first blade 1212 is outside the boundary of the side edge of the second blade 1221 on the side away from the first blade 1211; it is also possible that the side edge of the second blade 1222 on the side away from the first blade 1212 is bounded inwardly of the side edge of the second blade 1221 on the side away from the first blade 1211. In the case where the side of the second blade 1222 on the side away from the first blade 1212 is in the same plane as the side of the second blade 1221 on the side away from the first blade 1211, the boundary of the side edge of the second blade 1222 on the side away from the first blade 1212 is aligned with the boundary of the side edge of the second blade 1221 on the side away from the first blade 1211.
In the embodiment of the present invention, since the side of the first blade 1212 facing away from the second blade 1222 is parallel to or in the same plane as the side of the first blade 1211 facing away from the second blade 1221, and the side of the second blade 1222 facing away from the first blade 1212 is parallel to or in the same plane as the side of the second blade 1221 facing away from the first blade 1211, the first blade 121 formed by the first blade 1211 and the first blade 1212 and the second blade 122 formed by the second blade 1221 and the second blade 1222 can have a relatively good appearance, and when the back membrane to be cut is cut by using the above-mentioned cutting die 12, the force applied by the user can be fully applied to the back membrane to be cut in the cutting direction, so that the force applied by the user during the cutting process can be reduced, and the cutting can be facilitated.
An embodiment of the present invention further provides a flexible display device, as shown in fig. 9 and 10, including a display element 13; a flexible substrate 14; the display element 13 is disposed on the flexible substrate 14, and a region of the flexible substrate 14 where the display element 13 is not disposed includes: a flip area 141 and a bending area 142, wherein a portion of the flexible substrate 14 located in the flip area 141 is flipped to the back side of the display element 13 through a portion located in the bending area 142; and a first portion of backing film 101 and a second portion of backing film 102; a first partial backing film 101 and a second partial backing film 102 are disposed on the back side of the flexible substrate 14; the side surface of the first part of the back film 101 close to the bending region 142 is a vertical surface, and the boundary of the first part of the back film 101 close to the bending region 142 is outside the boundary of the display element 13 close to the bending region 142; alternatively, the boundary of the first partial back film 101 on the side close to the bending region 142 is aligned with the boundary of the display element 13 on the side close to the bending region 142.
The flexible Display device provided by the embodiment of the invention is an electroluminescent Display device, and the electroluminescent Display device can be an Organic Light-Emitting Diode Display (OLED for short) or a Quantum Dot electroluminescent Display (Quantum Dot Light Emitting Diodes Display, QLED for short).
As shown in fig. 11, the main structure of the flexible display device further includes other components such as a frame 1, a cover glass 2, a display Panel (Panel)3, a circuit board 4, and a control circuit 5.
The longitudinal section of the frame 1 is U-shaped, the display panel 3, the circuit board 4 and other accessories are all arranged in the frame 1, the circuit board 4 is arranged below the display panel 3, and the cover glass 2 is arranged on one side of the display panel 3, which is far away from the circuit board 4. As shown in fig. 11, the control circuit 5 is provided on the extended side of the display panel 3.
As shown in fig. 12, the display panel 3 includes a display area 01 and a peripheral area 02 located on at least one side of the display area 01, and fig. 12 illustrates an example in which the peripheral area 02 surrounds the display area 01. The display region 01 includes a plurality of light emitting regions 011 and a non-light emitting region 012 defining the plurality of light emitting regions 011. The peripheral region 02 is used for wiring, and a gate driver circuit may be provided in the peripheral region 02.
Here, the control circuit 5 may be, for example, a control chip IC, and the control circuit 5 is located in the peripheral area 02 of the display panel 3. On this basis, the region of the flexible substrate 14 where the display element 13 is not disposed is the peripheral region 02, and the peripheral region 02 includes the folding region 141 and the bending region 142. Illustratively, as shown in fig. 9 and 10, the control circuit 5 is located in the folding region 141, and the control circuit 5 is folded to the back of the display element 13 through a portion located in the folding region 142.
It should be noted that the pad area is an area where the electrodes on the array substrate are connected to the control circuit 5, and in the flexible display device provided in the embodiment of the present invention, the pad area includes the folding area 141 and the bending area 142.
It is to be understood that the display elements 13 are located in the light emitting regions 011 in the display region 01 of the display panel 3, one display element 13 is correspondingly disposed in one light emitting region 011, and the display element 13 is for emitting light. On this basis, the display element 13 is located on one surface of the flexible substrate 14, which is the front surface of the flexible substrate 14, and the other surface of the flexible substrate 14 is the back surface of the flexible substrate 14. As shown in fig. 9 and 10, a first partial back film 101 and a second partial back film 102 are provided on the back surface of the flexible substrate 14.
The flexible display device provided by the embodiment of the invention is an electroluminescent display device, and the display panel 3 of the electroluminescent display device is an electroluminescent display panel. As shown in fig. 13, the main structure of the electroluminescent display panel includes a display substrate 31 and an encapsulation layer 32 for encapsulating the display substrate 31. Here, the encapsulation layer 32 may be an encapsulation film or an encapsulation substrate.
As shown in fig. 13, the display substrate 31 includes a plurality of display elements 13, the plurality of display elements 13 include light-emitting devices and a driver circuit provided over a flexible substrate 14, and the driver circuit includes a plurality of thin film transistors 310. The light emitting device includes an anode 311, a light emitting function layer 312, and a cathode 313, and the anode 311 is electrically connected to a drain of the thin film transistor 310 serving as a driving transistor among the plurality of thin film transistors 310. The display substrate 31 further includes a pixel defining layer 314, the pixel defining layer 314 including a plurality of opening regions, one light emitting device being disposed in one opening region. In some embodiments, the light emitting functional layer 312 includes a light emitting layer. In other embodiments, the light-emitting function layer 312 includes one or more of an Electron Transport Layer (ETL), an Electron Injection Layer (EIL), a Hole Transport Layer (HTL), and a Hole Injection Layer (HIL) in addition to the light-emitting layer.
As shown in fig. 13, the display substrate 31 further includes a planarization layer 315 provided between the driving circuit and the anode 311.
It will be appreciated by those skilled in the art that in order to achieve a narrower bottom bezel for the flexible display device, it is common to bend the flip areas of the flexible substrate 14 to the back of the flexible display panel, and in some embodiments, as shown in fig. 9 and 10, the control circuit 5 is disposed in the flip areas of the flexible substrate 14, so that the side of the flexible substrate 14 that is attached to the control circuit 5 is bent to the back of the flexible display panel.
The related art provides a flexible display device, as shown in fig. 14 and 15, including a display element 13; a flexible substrate 14; the display element 13 is disposed on the flexible substrate 14, and a region of the flexible substrate 14 where the display element 13 is not disposed includes: a flip area 141 and a bending area 142, wherein a portion of the flexible substrate 14 located in the flip area 141 is flipped to the back side of the display element 13 through a portion located in the bending area 142; and a first portion of backing film 101 and a second portion of backing film 102; a first partial backing film 101 and a second partial backing film 102 are disposed on the back side of the flexible substrate 14; the side surface of the first part of the back film 101 close to the bending region 142 is an inclined surface. Since the side of the first portion of the back film 101 close to the bending region 142 in the flexible display device in the related art is an inclined surface, when the control circuit 5 located in the folding region 141 in the flexible display device is bent, the portion of the bending region 142 of the flexible substrate 14 may be close to the inclined surface of the first portion of the back film 101 close to the bending region 142, which may result in insufficient supporting force of the lower portion of the flexible substrate 14, and thus the bending shape of the bending region 142 may be deformed, which may cause the film layer between the display element 13 and the flexible substrate 14 to be separated.
The embodiment of the invention provides a flexible display device, which comprises a display element 13; a flexible substrate 14; the display element 13 is disposed on the flexible substrate 14, and a region of the flexible substrate 14 where the display element 13 is not disposed includes: a flip area 141 and a bending area 142, wherein a portion of the flexible substrate 14 located in the flip area 141 is flipped to the back side of the display element 13 through a portion located in the bending area 142; and a first portion of backing film 101 and a second portion of backing film 102; a first partial backing film 101 and a second partial backing film 102 are disposed on the back side of the flexible substrate 14; the side surface of the first part of the back film 101 close to the bending region 142 is a vertical surface, and the boundary of the first part of the back film 101 close to the bending region 142 is outside the boundary of the display element 13 close to the bending region 142; alternatively, the boundary of the first partial back film 101 on the side close to the bending region 142 is aligned with the boundary of the display element 13 on the side close to the bending region 142. Since the side surface of the first part of the back film 101 close to the bending region 142 in the flexible display device provided by the embodiment of the invention is a vertical surface, the boundary of the first part of the back film 101 close to the bending region 142 is outside the boundary of the display element 13 close to the bending region 142; or, the boundary of the first part of the back film 101 close to the bending region 142 is aligned with the boundary of the display element 13 close to the bending region 142, and when the control circuit 5 located in the folding region 141 in the flexible display device is bent, the lower supporting force of the flexible substrate 14 is uniform, so that a good bending shape can be ensured, that is, the bending shape of the bending region 142 is a circular arc shape, and the film layer between the display element 13 and the flexible substrate 14 is prevented from being separated.
In some embodiments, as shown in fig. 9 and 10, the side of the second portion of the back film 102 close to the bending region 142 is a vertical surface, and the boundary of the second portion of the back film 102 close to the bending region 142 is outside the boundary of the display element 13 close to the bending region 142; alternatively, the boundary of the second partial back film 102 on the side close to the bending region 142 is aligned with the boundary of the display element 13 close to the bending region 142.
In the embodiment of the present invention, since the side surface of the second partial back film 102 close to the bending region 142 is a vertical surface, the boundary of the second partial back film 102 close to the bending region 142 is outside the boundary of the display element 13 close to the bending region 142; or, the boundary of the second portion of the back film 102 close to the bending region 142 is aligned with the boundary of the display element 13 close to the bending region 142, so that when the control circuit 5 located in the folding region 141 in the flexible display device is bent, the lower supporting force of the flexible substrate 14 can be further made uniform, and a good bending shape is ensured, that is, the bending shape of the bending region 142 is an arc shape, thereby further preventing the film layer between the display element 13 and the flexible substrate 14 from being separated.
The embodiment of the invention also provides a preparation method of the back film 10, wherein the back film to be cut comprises the following steps: the cutting device comprises a bearing layer 11 and a layer to be cut, wherein the layer to be cut is arranged on the bearing layer 11; as shown in fig. 16, the method of manufacturing the back film 10 includes:
s100, the first blade 1211 and the second blade 1212 of the cutting die 12 are vertically arranged with the surface of the layer to be cut away from the bearing layer along the cutting direction.
S101, cutting a layer to be cut to form a back film 10; the back film 10 includes: a first partial backsheet 101, a second partial backsheet 102, and a third partial backsheet 103 disposed between the first and second partial backsheet 101, 102.
Here, the thickness of the carrier layer 11 is greater than that of the layer to be cut, and the layer to be cut is cut by the first and second blades 1211 and 1212 of the cutting die 12 while the carrier layer 11 is not cut as a whole layer since the thickness of the carrier layer 11 is greater than that of the layer to be cut.
For the materials of the first portion back film 101, the second portion back film 102, and the third portion back film 103, reference may be made to the above embodiments, and details are not repeated here.
In addition, the preparation method of the back film 10 in S101 includes:
s1011, the back film 10 includes: a first portion of the backing film 101 and a second portion of the backing film 102, with a space between the first portion of the backing film 101 and the second portion of the backing film 102.
Here, when the back film 10 in step S1011 is formed, the third partial back film 103 in step S101 may be removed.
In the embodiment of the present invention, the preparation method of the back film 10 has the same technical effects as the back film 10 in the above embodiment, and reference may be made to the technical effects of the back film 10 in the above embodiment, which is not described herein again.
An embodiment of the present invention further provides a method for manufacturing a flexible display device, as shown in fig. 17 and 18, including:
and S200, attaching the back film 10 formed in the step S101 to the side, away from the display element 13, of the flexible substrate 14.
S201, removing the bearing layer 11.
S202, a portion of the flexible substrate 14 located in the folding region 141 is folded to a portion located on the back surface of the display element 13 through a portion located in the folding region 142.
Or;
and S300, removing a third part of the back film 103 contained in the back film 10.
S301, attaching the back film 10 with the third portion of the back film 103 removed to the side of the flexible substrate 14 away from the display element 13.
S302, removing the bearing layer 11.
S303, a portion of the flexible substrate 14 located in the folding region 141 is folded to a portion located on the back surface of the display element 13 through a portion located in the folding region 142.
Referring to fig. 9, when the flexible substrate 14 is not bent, the first portion of the back film 101 and the second portion of the back film 102 included in the back film 10 are attached to a side of the flexible substrate 14 away from the display element 13, at this time, the first portion of the back film 101 and the display element 13 are respectively disposed on two opposite sides of the flexible substrate 14, the second portion of the back film 102 and the control circuit 5 are respectively disposed on two opposite sides of the flexible substrate 14, a distance portion between the first portion of the back film 101 and the second portion of the back film 102 is a portion of a bending region 142 of the flexible substrate 14, and a portion of the control circuit 5 and the second portion of the back film 102 located on the flexible substrate 14 is a portion of a folding region 141. The portion of the flexible substrate 14 located in the folding region 141 is folded to the portion located on the back surface of the display element 13 through the portion located in the folding region 142, so as to form the flexible display device shown in fig. 10.
As can be seen from fig. 10, since the first partial back film 101 and the second partial back film 102 are vertical surfaces on the side close to the bending region 142, the supporting force of the flexible substrate 14 during bending can be made uniform, and a good bending shape can be ensured, so that the film layer separation between the display element 13 and the flexible substrate 14 during bending can be avoided.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (12)

1. A backsheet, comprising:
a carrier layer;
and a first portion of the backing film and a second portion of the backing film; the first partial back film and the second partial back film are arranged on the same surface of the bearing layer in a peelable mode and are arranged side by side, a space is reserved between the first partial back film and the second partial back film, and the side, close to the second partial back film, of the first partial back film is perpendicular to the surface, far away from the bearing layer, of the first partial back film.
2. The backsheet according to claim 1, wherein the side of the second portion of the backsheet adjacent the first portion of the backsheet is perpendicular to the surface of the second portion of the backsheet distal from the carrier layer.
3. The backsheet of claim 1, further comprising:
a third portion of the backing film; the third partial backsheet is releasably disposed on the surface of the carrier layer between the first partial backsheet and the second partial backsheet.
4. A cutting die, comprising:
a first blade; the first blade has a first blade edge;
and a second blade; the second blade is provided with a second blade edge, the second blade is fixedly connected with the first blade, and the first blade edge and the second blade edge are oppositely arranged along the thickness direction of the first blade;
along the cutting direction of the first blade and the second blade, the side surface of the first blade far away from the second blade is a vertical surface, and the side surface of the first blade near the second blade is an inclined surface.
5. The cutting die of claim 4, wherein the side of the second cutting edge away from the first cutting edge is a vertical surface, and the side of the second cutting edge close to the first cutting edge is a bevel surface.
6. The cutting die of claim 4, wherein the first blade further comprises a first blade body, the second blade further comprises a second blade body, the first blade body is fixedly connected with the second blade body, the first blade edge is positioned at the front end of the first blade body, and the second blade edge is positioned at the front end of the second blade body;
the side surface of the first blade far away from the second blade is parallel to or in the same plane with the side surface of the first blade far away from the second blade.
7. The cutting die of claim 6, wherein a side of the second blade remote from the first blade is parallel to or in the same plane as a side of the second blade remote from the first blade.
8. A flexible display device, comprising:
a display element;
a flexible substrate; the display element is disposed on the flexible substrate, and a region of the flexible substrate where the display element is not disposed includes: the flexible substrate is provided with a turnover area and a bending area, and the part of the flexible substrate, which is positioned in the turnover area, is turned to the back of the display element through the part of the flexible substrate, which is positioned in the bending area;
and a first portion of the backing film and a second portion of the backing film; the first partial backing film and the second partial backing film are disposed on a back side of the flexible substrate;
the side surface of the first part of back film close to one side of the bending area is a vertical surface, and the boundary of the first part of back film close to one side of the bending area is beyond the boundary of the display element close to one side of the bending area; alternatively, a boundary of a side of the first partial back film close to the bending region is aligned with a boundary of a side of the display element close to the bending region.
9. The flexible display device according to claim 8, wherein a side surface of the second partial back film on a side close to the bending region is a vertical surface, and a boundary of the second partial back film on the side close to the bending region is outside a boundary of the display element on the side close to the bending region; alternatively, the boundary of the second partial back film on the side close to the bending region is aligned with the boundary of the display element close to the bending region.
10. A method for preparing a back film, comprising:
the back film to be cut includes: the cutting device comprises a bearing layer and a layer to be cut, wherein the layer to be cut is arranged on the bearing layer;
placing the first and second cutting edges of the cutting die of any one of claims 4-7 perpendicular to the surface of the layer to be cut on the side remote from the carrier layer in the cutting direction;
cutting the layer to be cut to form a back film, wherein the back film comprises: a first partial backsheet, a second partial backsheet, and a third partial backsheet disposed between the first partial backsheet and the second partial backsheet.
11. The production method according to claim 10, wherein the back film comprises: a first portion of a backsheet and the second portion of a backsheet with a space therebetween.
12. A method of manufacturing a flexible display device, comprising:
attaching the backsheet of claim 1 to a side of the flexible substrate facing away from the display element;
removing the bearing layer;
folding the part of the flexible substrate positioned in the folding area to the back surface of the display element through the part positioned in the bending area;
alternatively, removing a third portion of the backsheet comprised by the backsheet of claim 3;
attaching the back film from which the third portion of the back film is removed to a side of the flexible substrate facing away from the display element;
removing the bearing layer;
and folding the part of the flexible substrate positioned in the folding area to the back surface of the display element through the part positioned in the bending area.
CN202010002060.2A 2020-01-02 2020-01-02 Back film and preparation method thereof, flexible display device and preparation method thereof, and cutting die Active CN111162203B (en)

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