CN111653593B

CN111653593B - Display panel, manufacturing method thereof and display device

Info

Publication number: CN111653593B
Application number: CN202010537701.4A
Authority: CN
Inventors: 刘晓云
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2022-12-13
Anticipated expiration: 2040-06-12
Also published as: CN111653593A

Abstract

The invention provides a display panel, a manufacturing method thereof and a display device, and relates to the technical field of display; this display panel will set up in the fretwork unit from type portion, avoids first tie coat and second tie coat to contact and closely bond in the fretwork unit. The display panel comprises a stretchable substrate, a protective substrate, a display substrate and a plurality of release parts; a stretchable substrate comprising a first base and a first adhesive layer; a protective substrate including a second base and a second adhesive layer; the second bonding layer is arranged opposite to the first bonding layer; the display substrate is positioned between the stretchable substrate and the protective substrate and comprises a plurality of hollowed-out units and a plurality of connecting units, and the hollowed-out units are adjacent to the connecting units; a plurality of from type portions, it is located the fretwork unit from the type portion, is configured to keep apart first tie coat and second tie coat. The invention is suitable for manufacturing the display panel.

Description

Display panel, manufacturing method thereof and display device

Technical Field

The invention relates to the technical field of display, in particular to a display panel, a manufacturing method thereof and a display device.

Background

With the continuous development of technologies, stretchable display panels have gained wide attention. The stretchable display panel comprises a plurality of independent display units, a connecting unit for connecting two adjacent display units, and a hollow unit adjacent to the connecting unit. In order to protect the display panel, a back film is attached to the stretchable display panel. In the attaching process of the back film, the adhesive layer included in the back film has fluidity, so that part of the adhesive layer flows into the hollow unit.

Since the back film is not stretchable, the back film needs to be peeled off before the display panel is stretched. Because part of the adhesive layer is left in the hollow-out unit, when the back film is torn off, the back film can be torn off only by using a large external force; therefore, the connecting unit adjacent to the hollow unit is easily damaged, and further the connecting unit is cracked, so that the reliability of the product is reduced, and the display effect is poor.

Disclosure of Invention

The invention provides a display panel, a manufacturing method thereof and a display device.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

in one aspect, there is provided a display panel including:

a stretchable substrate comprising a first base and a first adhesive layer; a protective substrate including a second base and a second adhesive layer; the second bonding layer is arranged opposite to the first bonding layer; the display substrate is positioned between the stretchable substrate and the protective substrate and comprises a plurality of hollowed-out units and a plurality of connecting units, and the hollowed-out units are adjacent to the connecting units; a plurality ofly from type portion, it is located to leave type portion in the fretwork unit, be configured to keep apart first tie coat with the second tie coat.

Optionally, the release part is attached to the first adhesive layer or the second adhesive layer.

Optionally, the release part includes a silicon release agent or a fluorine release agent.

Optionally, the display substrate further includes a third base and a plurality of display units located on the third base; the display substrate is positioned between the stretchable substrate and the protective substrate, and the first bonding layer is adjacent to the third substrate; the connecting unit is positioned between two adjacent display units and respectively connects the two adjacent display units; wherein the display unit comprises at least one sub-pixel; the hollow units are located in the area between two adjacent display units except the area where the connecting unit is located, and penetrate through the third substrate.

Optionally, the sub-pixels include: the buffer layer, the active layer, the gate insulating layer, the grid electrode, the interlayer dielectric layer, the source-drain metal layer, the passivation layer, the light-emitting device and the first packaging part are sequentially arranged on the third substrate in a stacked mode; the connection unit includes: a first organic layer, a metal wire, a second organic layer and a second encapsulation part which are sequentially stacked on the third substrate; the source drain metal layer and the metal wire are arranged on the same layer; the first encapsulation part and the second encapsulation part are arranged on the same layer.

On the other hand, a display device is provided, which is obtained by peeling off the protective substrate in the display panel.

In another aspect, a method for manufacturing a display panel is provided, including: forming a stretchable substrate comprising a first base and a first adhesive layer; forming a protective substrate including a second base and a second adhesive layer; forming a display substrate, wherein the display substrate comprises a plurality of hollowed-out units and a plurality of connecting units, and the hollowed-out units are adjacent to the connecting units; attaching the stretchable substrate, the display substrate and the protective substrate, and forming the release part in the hollow unit of the display substrate; wherein the display substrate is positioned between the stretchable substrate and the protective substrate; the first bonding layer and the second bonding layer are oppositely arranged, and the release part is located between the first bonding layer and the second bonding layer.

Optionally, will but stretch the base plate, display substrate with the laminating of protection base plate, and in display substrate's the fretwork unit forms from type portion includes: bonding the protective substrate and the display substrate; forming a plurality of release parts on the hollowed-out unit through ink-jet printing and curing; and attaching the stretchable substrate to one side of the display substrate, which is not attached with the protective substrate.

Optionally, the stretchable substrate, the display substrate and the protection substrate are attached to each other, and the release portion is formed in the hollow unit of the display substrate, including: bonding the protective substrate and the display substrate; forming a plurality of release parts on the stretchable substrate in a region corresponding to the hollow-out units through coating and curing; and attaching the stretchable substrate to one side, which is not attached with the protective substrate, of the display substrate.

Optionally, the forming of the plurality of release portions on the stretchable substrate in the region corresponding to the hollow unit by coating and curing includes: forming a release layer on the first bonding layer by coating; and patterning the release layer, curing the patterned release layer, and forming a plurality of release parts in the area corresponding to the hollow units.

Optionally, after the stretchable substrate, the display substrate and the protection substrate are attached to each other, and the release portion is formed in the hollow unit of the display substrate, the method further includes: and stripping the protective substrate.

The embodiment of the invention provides a display panel, a manufacturing method thereof and a display device, wherein the display panel comprises a stretchable substrate, a protective substrate, a display substrate and a plurality of release parts; a stretchable substrate comprising a first base and a first adhesive layer; a protective substrate including a second base and a second adhesive layer; the second bonding layer is arranged opposite to the first bonding layer; the display substrate is positioned between the stretchable substrate and the protective substrate and comprises a plurality of hollowed-out units and a plurality of connecting units, and the hollowed-out units are adjacent to the connecting units; a plurality ofly from type portion, it is located to leave type portion in the fretwork unit, be configured to keep apart first tie coat with the second tie coat.

According to the display panel, the release part is arranged in the hollow unit, and the first bonding layer and the second bonding layer are isolated by the release part, so that the first bonding layer and the second bonding layer are prevented from contacting in the hollow unit, and the bonding between the first bonding layer and the second bonding layer is prevented; when the protective substrate is lifted off to realize the stretching function of the display panel, the second bonding layer of the protective substrate and the first bonding layer in the hollow unit can be separated only by a small external force, so that the first bonding layer is prevented from being torn; and then avoid tearing the problem that the linkage unit that first tie coat leads to produced the crackle. The display panel is high in reliability and good in display effect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of a display panel in the prior art;

FIG. 2 is a SEM image of a display panel in the prior art;

FIG. 3 is a schematic diagram of a crack structure of a display panel in the prior art;

fig. 4 is a schematic structural diagram of a display substrate according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a display panel according to an embodiment of the present invention;

FIG. 6a is a schematic structural diagram of a stretchable substrate according to an embodiment of the present invention;

fig. 6b is a schematic structural diagram of a protection substrate according to an embodiment of the present invention;

FIG. 6c is a cross-sectional view along AA' of FIG. 4;

fig. 7 is a schematic view illustrating a method for manufacturing a release portion according to an embodiment of the present invention;

fig. 8 is a schematic view of another method for manufacturing a release portion according to an embodiment of the present invention.

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.

In the embodiments of the present invention, the terms "first", "second", "third", and the like are used for distinguishing identical items or similar items having substantially the same functions and actions, and are used only for clearly describing technical solutions of the embodiments of the present invention, and are not understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features.

In the embodiments of the present invention, unless otherwise specified, "a plurality" means two or more; the terms "upper" and the like refer to an orientation or positional relationship based on that shown in the drawings only for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

Example one

In recent years, foldable, rollable flexible display devices have come into the lives of people. In order to adapt to human skin, the stretchable display device is produced, so that the display device is closer to a human body, and the daily life of people is more convenient. Typical tensile structures today include hard film buckling structures, island bridge structures, open mesh structures. Island bridge structures are widely favored because of their unique tensile properties. Referring to fig. 1, a display panel of an island bridge structure in the prior art includes a TPE1 (Temporary protective Film, also called a back Film), a hollow device 13, and a stretchable substrate 2. Wherein, TPE1 includes PET11 (Polyethylene Terephthalate) and PSA12 (Pressure Sensitive Adhesive); the stretchable substrate 2 includes OCA14 (Optical Contact Adhesive) and PDMS15 (Polydimethylsiloxane). In the preparation process of the back film of the display panel, when the back film is manufactured on the hollow device by adopting a pressing process, the PSA included by the back film has fluidity, so that part of the PSA flows into the hollow area of the hollow device, and the OCA adhesive of the stretchable substrate also has fluidity and also flows into the hollow area of the hollow device in the pressing process. Thus, as shown in the schematic diagram in the dotted box in the upper right corner of fig. 2, the upper and lower layers of glue (i.e., PSA glue and OCA glue) contact and bond together in the hollowed-out area. FIG. 2 is a SEM (Scanning Electron Microscope) view of FIG. 1, in which the structures shown in the dotted square are enlarged views of the structures shown in the ellipses of FIG. 2.

The TPE is non-stretchable and is peeled off before the display panel is stretched. When the display panel is peeled off from the TPE, the OCA adhesive tightly adhered to the PSA adhesive in the hollow area is torn, which may damage the connection unit 132 adjacent to the hollow area 133 as shown in fig. 3, so that the connection unit 132 may crack as shown in the dotted circle of fig. 3. In a display panel with a large hollow-out ratio, the damage is more serious.

To solve the above problem, referring to fig. 5, an embodiment of the present invention provides a display panel, including:

the stretchable substrate 6 includes a first base 21 and a first adhesive layer 22.

A protective substrate 5 including a second base 52 and a second adhesive layer 51; the second adhesive layer 51 is disposed opposite to the first adhesive layer 22.

The display substrate 4 is located between the stretchable substrate 6 and the protection substrate 5, and as shown in fig. 4, the display substrate includes a plurality of hollow units 42 and a plurality of connection units 43, and the hollow units 42 and the connection units 43 are adjacent to each other.

The plurality of release portions 3 are located in the hollow unit, and are configured to isolate the first adhesive layer 22 from the second adhesive layer 51.

The first substrate of the stretchable substrate is a flexible substrate, and after stretching, the supporting effect on the display substrate can be still ensured. The material of the first substrate is not limited herein; illustratively, the material may be polydimethylsiloxane. The stretchable substrate is fixedly bonded with the display substrate through the first bonding layer; in the pressing process, the first bonding layer material flows, and part of the first bonding layer flows into the hollow-out units of the display substrate. The material of the first adhesive layer is not limited herein; illustratively, the material may be an optical glue.

The protective substrate is a non-stretchable substrate. The specific material of the second base of the protective substrate is not limited herein; illustratively, the material may be a flexible material, such as polyethylene terephthalate. The protective substrate is fixedly bonded with the display substrate through a second bonding layer; in the pressing process, the second bonding layer material flows, and part of the second bonding layer flows into the hollow-out units of the display substrate. The specific material of the second adhesive layer for protecting the substrate is not limited herein; the material may be, for example, a pressure sensitive adhesive, and specifically, a polyurethane type pressure sensitive adhesive having a viscosity of less than 2gf/25mm.

The display substrate can be a flexible display substrate, and the display substrate comprises a plurality of hollow units and a plurality of connecting units. The hollow unit of the display substrate can deform in the stretching process, so that the stretching function of the display panel is realized. Of course, the display substrate may further include a plurality of display units arranged in an array, and the connection unit is configured to connect two adjacent display units. Referring to fig. 4, a connection unit 43 and a hollow unit 42 are disposed between any two adjacent display units 41.

The connection unit may include a plurality of connection lines, for example: data lines, gate lines, etc. The shape of the cross section of the above-mentioned connection unit in the direction parallel to the first substrate is not limited, and may be a bar, a circle, a square, or the like. Fig. 4 is a bar diagram.

The release part can cover the first adhesive layer to play a role in isolating the first adhesive layer from the second adhesive layer; the second adhesive layer may be further covered to function as a separator for the first adhesive layer and the second adhesive layer. This is not a limitation here.

Here, the shape and thickness of the release portion are not limited. For example, the thickness of the release portion may be in a range of 9-11um, and specifically, the thickness of the release portion may be 10um.

The display panel is a flexible display panel (i.e., bendable and foldable). The type of the display panel is not limited herein; it may be any one of an OLED (Organic Light-emitting Diode) display panel, a Micro OLED Micro display panel, and a Mini LED Micro display panel. The OLED display panel has the advantages of simple preparation process, low cost, low power consumption, high luminous brightness, wide working temperature application range, light and thin volume, high response speed, easiness in realizing color display and large-screen display and the like, and the OLED display panel is preferably selected as the display panel in consideration of wider application prospects.

The embodiment of the invention provides a display panel, a manufacturing method thereof and a display device, wherein the display panel comprises a stretchable substrate, a protective substrate, a display substrate and a plurality of release parts; a stretchable substrate comprising a first base and a first adhesive layer; a protective substrate including a second base and a second adhesive layer; the second bonding layer is arranged opposite to the first bonding layer; the display substrate is positioned between the stretchable substrate and the protective substrate and comprises a plurality of hollowed-out units and a plurality of connecting units, and the hollowed-out units are adjacent to the connecting units; a plurality ofly from type portion, from type position in the fretwork unit, be configured to keep apart first tie coat and second tie coat.

According to the display panel, the release part is arranged in the hollow unit, and the first bonding layer and the second bonding layer are isolated by the release part, so that the first bonding layer and the second bonding layer are prevented from contacting in the hollow unit, and the bonding between the first bonding layer and the second bonding layer is prevented; then, when the protective substrate is lifted away to realize the stretching function of the display panel, the second bonding layer of the protective substrate and the first bonding layer in the hollow unit can be separated only by a small external force, so that the first bonding layer is prevented from being torn; and then avoid tearing the problem that the linkage unit that first tie coat leads to produced the crackle. The display panel is high in reliability and good in display effect.

Optionally, the release portion is attached to the first adhesive layer or attached to the second adhesive layer.

Referring to fig. 5, the release portion 3 is attached to a portion of the second adhesive layer 51 flowing into the cutout unit. The second adhesive layer flowing into the hollow unit can be partially covered by the release portion, or the second adhesive layer flowing into the hollow unit can be completely covered by the release portion. This is not a limitation here. Optionally, the release part includes a silicon release agent or a fluorine release agent in consideration of the isolation effect.

The specific type of the silicon release agent is not limited herein. Illustratively, a silicone oil release agent whose main component is polydimethylsiloxane silicone oil may be used. The specific type of the fluorine-containing release agent is not limited herein. For example, the main component of the fluorine release agent may be a fluorosilicone or fluorocarbon resin (a resin containing a fluorine segment, such as vinyl fluoride).

Optionally, referring to fig. 5, the display substrate further includes a third base 434, and a plurality of display units (not labeled in fig. 5) located on the third base 434; the display substrate 4 is located between the stretchable substrate 6 and the protection substrate 5, and the first adhesive layer 22 is adjacent to the third base 434; the connecting unit is positioned between two adjacent display units and respectively connected with the two adjacent display units; wherein the display unit comprises at least one sub-pixel; the hollow unit is positioned in the area between the two adjacent display units except the area where the connecting unit is positioned and penetrates through the third substrate.

Referring to fig. 4, the connection unit 43 is located between two adjacent display units 41, and respectively connects two adjacent display units 41; at this time, the structure of the display unit 41 is similar to a pixel island, the connection unit 43 is similar to a bridge connecting the pixel islands, and the structure of the display unit and the connection unit may be referred to as an island-bridge structure.

The meaning that the display unit comprises at least one sub-pixel is: the display unit may include a sub-pixel; or the display unit may comprise a plurality of sub-pixels. The sub-pixel may be any one of a red sub-pixel, a green sub-pixel, or a blue sub-pixel. If the display unit comprises a plurality of sub-pixels, the display unit can simultaneously comprise three sub-pixels, namely a red sub-pixel, a green sub-pixel or a blue sub-pixel; of course, it is also possible to include only one sub-pixel, for example: including only a plurality of red subpixels, or only a plurality of green subpixels, or only a plurality of blue subpixels. The concrete can be determined according to actual requirements.

The meaning of the hollow-out units penetrating through the third substrate is as follows: the third substrate where the hollow unit is located is removed.

The material of the third substrate is not limited, and the material of the third substrate may be PI (polyimide), for example.

Alternatively, as shown in fig. 5, the sub-pixel includes: a buffer layer 418, an active layer 417, a gate insulating layer 414, a gate electrode 416, an interlayer dielectric layer 413, a source-drain metal layer (not labeled in fig. 5), a passivation layer 411, a light emitting device (not labeled in fig. 5), and a first encapsulation portion 429, which are sequentially stacked on the third substrate 434; the connection unit includes: a first organic layer 431, a metal line 432, a second organic layer 433, and a second encapsulation portion 429' sequentially stacked on the third substrate 434; wherein, the source drain metal layer and the metal line 432 are arranged in the same layer; the first and second encapsulations 429, 429' are disposed in the same layer.

Referring to fig. 5, the source-drain metal layer includes a source 422, a drain 415, and a metal wire 419 disposed at the same layer as the source 422 and the drain 415. The source electrode, the drain electrode, the active layer, the gate insulating layer, and the gate electrode may form a Thin Film Transistor (TFT).

Referring to fig. 5, the sub-pixel further includes a pixel defining layer 423, and the light emitting device includes an anode 421, a hole injection layer, a hole transport layer, a light emitting layer 425, an electron transport layer, and an electron injection layer, and a cathode 420. The display substrate can be used for forming an OLED (Organic Light-Emitting Diode) display panel. The anode can be made of ITO (indium tin oxide), ag (silver) or ITO (indium tin oxide); the pixel defining layer may be formed of a resin such as polyacrylic resin or polyimide; the cathode may be formed by vapor deposition or sputtering of Mg (magnesium), ag (silver), or IZO (indium tin oxide) having high transmittance.

The source drain metal layer and the metal wire are arranged on the same layer, and the first packaging part and the second packaging part are arranged on the same layer. The same layer setting here means that the same layer is manufactured by adopting a one-time patterning process. The one-step patterning process refers to a process of forming a desired layer structure through one exposure. The primary patterning process includes masking, exposing, developing, etching, and stripping processes.

The material of the buffer layer is an inorganic material, and may be, for example, one or a mixture of several of silicon oxide, silicon nitride, and aluminum oxide.

The specific material of the active layer is not limited, and may be, for example, an inorganic semiconductor material, such as: amorphous silicon, polycrystalline silicon; or may also be an organic semiconductor material, which may be, for example, an oxide-containing semiconductor material, such as: IGZO (Indium Gallium Zinc Oxide).

The gate insulating layer, the interlayer dielectric layer and the passivation layer may be made of inorganic materials, and may be, for example, one or a mixture of several of silicon oxide, silicon nitride and aluminum oxide.

Specific materials of the metal line and the source-drain metal layer are not limited, and may be, for example, conductive metals such as Ti (titanium), al (aluminum), mo (molybdenum), ag (silver), or conductive oxides such as ITO (indium tin oxide), IZO (indium zinc oxide), znO (zinc oxide), in2O3 (indium oxide), and AlZnO (aluminum-doped zinc oxide).

The specific material of the first organic layer and the second organic layer is not limited, and may be, for example, polyimide or naphthoquinone diazide compound.

The first sealing portion and the second sealing portion may be a single-layer or multi-layer inorganic film layer such as silicon oxide, silicon nitride, or silicon oxynitride, or a dense film layer such as aluminum oxide, aluminum nitride, titanium nitride, or titanium nitride.

Example two

The embodiment of the invention provides a display device which is obtained by peeling off the protective substrate of the display panel in the first embodiment. When the release portion is attached to the first adhesive layer of the stretchable substrate, the release portion is still remained in the hollow unit after the protective substrate of the display panel according to embodiment one is peeled off, and at this time, the display device includes the release portion.

When the release portion is attached to the second adhesive layer of the protection substrate, after the protection substrate of the display panel according to the first embodiment is peeled, the release portion is peeled together with the protection substrate, and at this time, the display device does not include the release portion.

The display device is a stretchable display device, and after the protective substrate is peeled off, the display device can realize a stretching function. The stretchable display device can be better adapted to the skin of a human body, and therefore has a wide application prospect in the field of wearable display. The stretchable display device can also be any product or component with a display function, such as a television, a digital camera, a mobile phone, a tablet computer and the like. The display device may be any one of an OLED display device, a Micro OLED Micro display device, and a Mini LED Micro display device.

EXAMPLE III

An embodiment of the present invention provides a method for manufacturing a display panel, including:

s1, forming a stretchable substrate, as shown in fig. 6a, the stretchable substrate includes a first base 21 and a first adhesive layer 22.

The first substrate of the stretchable substrate is a flexible substrate, and after stretching, the support effect on the display substrate can be still ensured. The material of the first substrate is not limited herein; illustratively, the material may be polydimethylsiloxane. The material of the first adhesive layer is not limited herein; illustratively, the material may be an optical glue.

And S2, forming a protective substrate, wherein the protective substrate comprises a second base 52 and a second bonding layer 51 as shown in the figure 6 b.

The specific material of the second base of the protective substrate is not limited herein; illustratively, the material may be a flexible material, such as polyethylene terephthalate.

The specific material of the second adhesive layer for protecting the substrate is not limited herein; the material may be, for example, a pressure sensitive adhesive, and specifically, a polyurethane type pressure sensitive adhesive having a viscosity of less than 2gf/25mm.

S3, forming a display substrate, wherein the display substrate comprises a plurality of hollowed-out units and a plurality of connecting units, and the hollowed-out units are adjacent to the connecting units; as shown in fig. 6c, for convenience of manufacturing, the display substrate may be disposed on a rigid substrate 100 (e.g., a glass substrate), and after the film layer is formed, the display substrate with the relevant film layer disposed thereon may be peeled off from the rigid substrate. The specific number and arrangement mode of the connecting units and the hollowed-out units are not limited, and need to be determined according to actual conditions. Illustratively, referring to fig. 4, a connecting unit 43 and a hollowing unit 42 are disposed between any two adjacent display units 41.

S4, attaching the stretchable substrate, the display substrate and the protective substrate, and forming a release part in the hollow unit of the display substrate; thereby forming a display panel as shown in fig. 5.

Wherein the display substrate 4 shown with reference to fig. 5 is located between the stretchable substrate 6 and the protective substrate 5; the first adhesive layer 22 and the second adhesive layer 51 are oppositely arranged, and the release part 3 is positioned between the first adhesive layer 22 and the second adhesive layer 51.

It should be noted that, in the pressing process, the first adhesive layer and the second adhesive layer flow, and a part of the first adhesive layer and a part of the second adhesive layer flow into the hollow unit.

The embodiment of the invention provides a manufacturing method of a display panel, the display panel formed by the manufacturing method is provided with a release part arranged in a hollow unit, and a first bonding layer and a second bonding layer are isolated by the release part, so that the first bonding layer and the second bonding layer are prevented from contacting in the hollow unit, and the bonding between the first bonding layer and the second bonding layer is prevented; when the protective substrate is lifted off to realize the stretching function of the display panel, the second bonding layer of the protective substrate and the first bonding layer in the hollow unit can be separated only by a small external force, so that the first bonding layer is prevented from being torn; and then avoid tearing the problem that the linkage unit that first tie coat leads to produced the crackle. The display panel is high in reliability and good in display effect. The preparation method is simple and easy to implement and has strong operability.

Two methods for forming the release portion in the hollow unit of the display substrate are described below.

First, optionally, S4, can stretch base plate, display substrate and the laminating of protection base plate to form in display substrate' S fretwork unit from type portion, include:

s410, as shown in a of fig. 7, the protective substrate 5 and the display substrate 4 are bonded.

After bonding, the rigid substrate may be peeled off from the display substrate using LLO (laser lift off technology).

And S411, as shown in a b diagram in FIG. 7, forming a plurality of release parts 3 in the hollow-out unit through ink-jet printing and curing. Wherein, the release part 3 can be made of light release force material.

S412, as shown in fig. 7 c, the stretchable substrate 6 is attached to the side of the display substrate 4 to which the protective substrate 5 is not attached. Specifically, accurate fitting can be realized through alignment mark.

The release portion formed by the above method covers the second adhesive layer of the protection substrate 5 as shown in fig. 7 c.

The second kind, it is optional, S4, can stretch base plate, display substrate and the laminating of protection base plate to form in display substrate' S fretwork unit from type portion, include:

s420, as shown in a of fig. 8, the protective substrate 5 and the display substrate 4 are bonded.

S421, as shown in fig. 8 b, forming a plurality of releasing portions 3 on the stretchable substrate 6 in the areas corresponding to the hollow units by coating and curing.

Specifically, the coating may be performed by a nip extrusion coating method.

S422, as shown in fig. 8 c, the stretchable substrate 6 is attached to the side of the display substrate 4 to which the protective substrate 5 is not attached.

Further optionally, the step S421 of forming a plurality of release portions on the stretchable substrate in the region corresponding to the hollow unit by coating and curing includes:

and S4211, forming a release layer on the first bonding layer through coating.

S4212, patterning the release layer, curing the patterned release layer, and forming a plurality of release parts in the area corresponding to the hollowed-out units.

Specifically, the patterning process may be performed by using a reticle, using a dry etching or ashing process.

Optionally, in S4, after the stretchable substrate, the display substrate and the protection substrate are attached to each other, and the release portion is formed in the hollow unit of the display substrate, the method further includes:

and S5, stripping the protective substrate.

The method of peeling off the protective substrate is not limited herein; according to the different mode of setting from type portion, can be peeled off along with the protection substrate from type portion, perhaps can still remain in the fretwork unit from type portion.

For the description of the display panel structure in this embodiment, reference may be made to embodiment one, which is not described herein again.

The following describes a manufacturing method by taking the preparation of the display panel shown in fig. 5 as an example.

The manufacturing method comprises the following steps: and forming a display substrate, wherein the display substrate comprises a plurality of hollow units and a plurality of connecting units, and the hollow units and the connecting units are adjacent.

Specifically, the method for forming the display substrate shown in fig. 6c includes:

s301, a third base (PI) 434 is formed on the rigid substrate (Glass) 100.

S302, a Buffer layer (Buffer layer) 418 is formed on the third substrate 434.

S303, forming an active layer 417 on the buffer layer 418 and patterning by photolithography and etching processes.

S304, depositing a gate insulating layer (GI layer) 414.

S305, depositing a Gate (Gate layer) 416 by a sputtering process, and patterning by a photolithography and etching process.

S306, depositing an interlayer dielectric layer (ILD layer) 413.

S307, etching the interlayer dielectric layer 413, the gate 414 and the buffer layer 418 in the region where the connection unit and the hollow unit are located through an etching process.

S308, patterning the interlayer dielectric layer 413; so as to form two via holes for facilitating the subsequent electrical connection of the drain and the source with the active layer respectively.

S309, etching the third substrate 434 film in the area where the hollow unit is located through an etching process.

S310, filling the deep holes of the connecting unit and the hollow unit with an organic material and patterning to form a first organic layer 431.

S311, depositing a source drain metal layer (SD layer) through a shower process, and realizing patterning through photoetching and etching processes. The source-drain metal layer includes a source 422, a drain 415, a metal lead 419 at the display cell, and a metal line 432 at the connection cell.

S312, forming a second organic layer 433 by coating with an organic material and patterning by photolithography and etching.

S313, depositing an anode layer by a Sputter process and patterning by photolithography and etching to form the anode 421.

And S314, preparing a pixel definition layer 423 and patterning through photoetching and etching.

And S315, removing the first organic layer 431 and the second organic layer 433 in the region where the hollow unit is located by sequentially adopting a photoetching and Ashing process.

S316, a light-emitting layer (EL layer) 425 and a cathode 420 are sequentially evaporated by an evaporation apparatus.

S317, preparing and patterning an encapsulation layer through encapsulation equipment, wherein the encapsulation layer comprises a first encapsulation portion 429 located in the area where the display unit is located and a second encapsulation portion 429' located in the area where the connecting unit is located.

The manufacturing method further comprises the following steps: a stretchable substrate is formed, as shown in fig. 6a, and includes a first base 21 (high elasticity polydimethylsiloxane) and a first adhesive layer 22 (high adhesion acrylic double-sided adhesive layer).

Specifically, the method of forming a stretchable substrate includes:

and S01, providing a first substrate 21 (high-elasticity polydimethylsiloxane), and carrying out plasma modification on the surface of the first substrate. Because the polydimethylsiloxane has small surface tension and is not attached to the bonding layer, the polydimethylsiloxane needs to be modified by plasma to improve the surface energy of the PDMS.

S02, a first adhesive layer 22 is attached to the first substrate 21 using a film coater.

The manufacturing method further comprises the following steps: a protective substrate is formed, as shown in fig. 6b, comprising a second base 52 (polyethylene terephthalate) and a second adhesive layer 51 (pressure sensitive adhesive).

The stretchable substrate, the display substrate and the protection substrate are attached to form a release part in the hollow-out unit of the display substrate, so that a display panel structure as shown in fig. 5 is formed. The method for forming the release portion can refer to the foregoing description, and is not repeated here.

Therefore, when the protective substrate is lifted off to realize the stretching function of the display panel, the first bonding layer and the second bonding layer are isolated by the release part, and the second bonding layer of the protective substrate and the first bonding layer in the hollow unit can be separated only by small external force, so that the first bonding layer is prevented from being torn; and then avoid tearing the problem that the linkage unit that first tie coat leads to produced the crackle. Conversely, even if the external force is large, the first adhesive layer and the second adhesive layer are isolated by the release part, so that the protective substrate can be easily lifted off without damaging the display substrate.

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 claims.

Claims

1. A display panel, comprising:

a stretchable substrate comprising a first base and a first adhesive layer;

a protective substrate including a second base and a second adhesive layer; the second bonding layer is arranged opposite to the first bonding layer;

the display substrate is positioned between the stretchable substrate and the protective substrate and comprises a plurality of hollowed-out units and a plurality of connecting units, and the hollowed-out units are adjacent to the connecting units;

a plurality ofly from type portion, it is located to leave type portion in the fretwork unit, be configured to keep apart first tie coat with the second tie coat.

2. The display panel according to claim 1, wherein the release portion is attached to the first adhesive layer or the second adhesive layer.

3. The display panel according to claim 1, wherein the release portion comprises a silicon release agent or a fluorine release agent.

4. The display panel according to any one of claims 1 to 3, wherein the display substrate further comprises a third base, and a plurality of display units on the third base;

the display substrate is positioned between the stretchable substrate and the protective substrate, and the first bonding layer is adjacent to the third substrate;

the connecting unit is positioned between two adjacent display units and respectively connects the two adjacent display units; wherein the display unit comprises at least one sub-pixel;

the hollow unit is located in a region between two adjacent display units except the region where the connecting unit is located and penetrates through the third substrate.

5. The display panel according to claim 4, wherein the sub-pixels comprise: the buffer layer, the active layer, the gate insulating layer, the gate electrode, the interlayer dielectric layer, the source and drain metal layers, the passivation layer, the light emitting device and the first packaging part are sequentially stacked on the third substrate;

the connection unit includes: a first organic layer, a metal wire, a second organic layer and a second encapsulation part which are sequentially stacked on the third substrate;

the source drain metal layer and the metal wire are arranged on the same layer; the first packaging part and the second packaging part are arranged on the same layer.

6. A display device obtained by peeling off the protective substrate of the display panel according to any one of claims 1 to 5.

7. A method for manufacturing a display panel is characterized by comprising the following steps:

forming a stretchable substrate comprising a first base and a first adhesive layer;

forming a protective substrate including a second base and a second adhesive layer;

forming a display substrate, wherein the display substrate comprises a plurality of hollowed-out units and a plurality of connecting units, and the hollowed-out units are adjacent to the connecting units;

attaching the stretchable substrate, the display substrate and the protective substrate, and forming a release part in the hollow unit of the display substrate; wherein the display substrate is positioned between the stretchable substrate and the protective substrate; the first bonding layer and the second bonding layer are oppositely arranged, and the release part is located between the first bonding layer and the second bonding layer.

8. The method for manufacturing a display panel according to claim 7, wherein the attaching the stretchable substrate, the display substrate and the protection substrate and forming the release portion in the hollow unit of the display substrate comprises:

bonding the protective substrate and the display substrate;

forming a plurality of release parts on the hollowed-out unit through ink-jet printing and curing;

and attaching the stretchable substrate to one side of the display substrate, which is not attached with the protective substrate.

9. The method for manufacturing a display panel according to claim 7, wherein the attaching the stretchable substrate, the display substrate and the protection substrate and forming the release portion in the hollow unit of the display substrate includes:

bonding the protective substrate and the display substrate;

forming a plurality of release parts on the stretchable substrate in a region corresponding to the hollow-out units through coating and curing;

and attaching the stretchable substrate to one side, which is not attached with the protective substrate, of the display substrate.

10. The method for manufacturing a display panel according to claim 9, wherein the forming of the plurality of release portions on the stretchable substrate in the region corresponding to the hollow-out units by coating and curing comprises:

forming a release layer on the first bonding layer by coating;

and patterning the release layer, curing the patterned release layer, and forming a plurality of release parts in the area corresponding to the hollow units.

11. The method for manufacturing a display panel according to any one of claims 7 to 10, wherein after the stretchable substrate, the display substrate and the protective substrate are attached to each other, and the release portion is formed in the hollow unit of the display substrate, the method further comprises:

and stripping the protective substrate.