CN117098409A - Stretchable display module, preparation method thereof and display device - Google Patents
Stretchable display module, preparation method thereof and display device Download PDFInfo
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- CN117098409A CN117098409A CN202311049178.0A CN202311049178A CN117098409A CN 117098409 A CN117098409 A CN 117098409A CN 202311049178 A CN202311049178 A CN 202311049178A CN 117098409 A CN117098409 A CN 117098409A
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Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
-
- 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
- G09F9/335—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 being organic light emitting diodes [OLED]
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/1201—Manufacture or treatment
-
- 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
- H10K59/80—Constructional details
- H10K59/87—Passivation; Containers; Encapsulations
- H10K59/873—Encapsulations
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optics & Photonics (AREA)
- Electroluminescent Light Sources (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The embodiment of the disclosure discloses a stretchable display module, a preparation method thereof and a display device. In one embodiment, the stretchable display module comprises a stretchable display panel, a first protective film adhered to a light emitting side of the stretchable display panel through a first adhesive layer, and a second protective film adhered to a backlight side of the stretchable display panel through a second adhesive layer, wherein the stretchable display panel comprises a display area and a frame area surrounding the display area; the orthographic projection of the first adhesive layer on the stretchable display panel is positioned in the frame area, and/or the orthographic projection of the second adhesive layer on the stretchable display panel is positioned in the frame area. According to the embodiment, the protective film can be prevented from inhibiting the deformation of the display panel in the light emitting direction during stretching, so that the stretching performance of the stretchable display module is improved.
Description
Technical Field
The present disclosure relates to the field of display technology. More particularly, to a stretchable display module, a preparation method thereof and a display device.
Background
With the development of display technology, organic Light-Emitting diodes (OLEDs) capable of flexible display promote diversification of display, and gradually become the mainstream of display technology. In some related art, an island region for preparing a sub-pixel region and a bridge region for routing are formed by opening a hole in a substrate of an OLED flexible display panel, and stretching of the display panel, called a Stretchable (display) module, is achieved by deformation of the bridge region. However, the stretchable display module in the related art has the problem of limited stretching performance.
Disclosure of Invention
The disclosure provides a stretchable display module, a manufacturing method thereof and a display device, so as to solve at least one of the problems in the prior art.
In order to achieve the above purpose, the present disclosure adopts the following technical scheme:
a first aspect of the present disclosure provides a stretchable display module, including a stretchable display panel, a first protective film adhered to a light-emitting side of the stretchable display panel through a first adhesive layer, and a second protective film adhered to a backlight side of the stretchable display panel through a second adhesive layer, the stretchable display panel including a display area and a bezel area surrounding the display area;
the orthographic projection of the first adhesive layer on the stretchable display panel is positioned in the frame area, and/or the orthographic projection of the second adhesive layer on the stretchable display panel is positioned in the frame area.
Optionally, an orthographic projection of the first adhesive layer on the stretchable display panel surrounds the display area, and/or an orthographic projection of the second adhesive layer on the stretchable display panel surrounds the display area.
Optionally, the minimum distance between the front projection of the first adhesive layer on the stretchable display panel and the display area is greater than 0.3mm.
Optionally, the front projection of the first adhesive layer on the stretchable display panel coincides with the front projection of the second adhesive layer on the stretchable display panel.
Optionally, the thickness of the first glue layer is 5 μm-400 μm, and/or the thickness of the second glue layer is 5 μm-400 μm.
Optionally, a side of the first protective film facing the stretchable display panel is coated with a first coating layer having a friction coefficient smaller than a preset value, and/or a side of the second protective film facing the stretchable display panel is coated with a second coating layer having a friction coefficient smaller than a preset value.
Optionally, the display area includes a plurality of island areas, be located the trompil district between the adjacent island area and connect the bridge area of adjacent island area, the island area includes at least one sub-pixel area, first glue film with the second glue film is respectively and seals the frame glue, first protection film first glue film, stretchable display panel, the second glue film with the second protection film encloses and closes and form and pack organic solution in the confined cavity.
A second aspect of the present disclosure provides a stretchable display device, including the stretchable display module provided in the first aspect of the present disclosure.
A third aspect of the present disclosure provides a method for manufacturing a stretchable display module, including:
preparing a stretchable display panel, the stretchable display panel comprising a display area and a bezel area surrounding the display area;
bonding a first protective film on the light emergent side of the stretchable display panel through a first adhesive layer, and bonding a second protective film on the backlight side of the stretchable display panel through a second adhesive layer; the front projection of the first adhesive layer on the stretchable display panel is located in the frame area, and/or the front projection of the second adhesive layer on the stretchable display panel is located in the frame area.
Alternatively, the process may be carried out in a single-stage,
the preparing a stretchable display panel includes:
preparing a stretchable display panel on a carrier plate, wherein the stretchable display panel comprises a display area and a frame area surrounding the display area, the display area comprises a plurality of island areas, open pore areas positioned between adjacent island areas and bridge areas connected with the adjacent island areas, and the island areas comprise at least one sub-pixel area;
the bonding the first protective film on the light emitting side of the stretchable display panel through the first adhesive layer, and bonding the second protective film on the backlight side of the stretchable display panel through the second adhesive layer includes:
forming a first frame sealing adhesive which surrounds the display area and serves as a first adhesive layer in a frame area of the light emitting side of the stretchable display panel;
adhering a first protective film to the light emitting side of the stretchable display panel through the first frame sealing adhesive;
separating the stretchable display panel from the carrier plate;
forming a second frame sealing adhesive which surrounds the display area and is used as a second adhesive layer in a frame area on the backlight side of the stretchable display panel;
filling organic solution into a cavity formed by enclosing the first protective film, the first frame sealing glue, the stretchable display panel and the second frame sealing glue from the backlight side of the stretchable display panel;
and adhering a second protective film to the backlight side of the stretchable display panel through the second frame sealing adhesive.
The beneficial effects of the present disclosure are as follows:
according to the technical scheme, through the design of the adhesive layer for bonding the protective film, deformation of the display panel in the light emitting direction can be prevented from being restrained by the protective film during stretching, so that the stretching performance of the stretchable display module is improved.
Drawings
The following describes in further detail the specific embodiments of the present disclosure with reference to the drawings.
Fig. 1 is a schematic top view showing a part of a stretchable display panel with an island structure.
Fig. 2 is a schematic top view showing a part of a stretchable display panel of another island bridge structure.
Fig. 3 is a schematic cross-sectional view of a stretchable display module according to an embodiment of the disclosure.
Fig. 4 is a schematic top view of a stretchable display panel in a stretchable display module according to an embodiment of the disclosure.
Fig. 5 illustrates another cross-sectional view of a stretchable display module provided by an embodiment of the present disclosure.
Fig. 6 is a schematic cross-sectional view showing a part of the structure of a stretchable display panel in a stretchable display module according to an embodiment of the disclosure.
Detailed Description
As used in this disclosure, "formed on … …," "formed on … …," and "disposed on … …" may mean that one layer is formed directly on or disposed on another layer, or that one layer is formed indirectly on or disposed on another layer, i.e., that other layers are present between the two layers.
It should be noted that although the terms "first," "second," etc. may be used herein to describe various elements, components, elements, regions, layers and/or sections, these elements, components, elements, regions, layers and/or sections should not be limited by these terms. Rather, these terms are used to distinguish one component, member, element, region, layer and/or section from another. Thus, for example, a first component, a first member, a first element, a first region, a first layer, and/or a first portion discussed below may be referred to as a second component, a second member, a second element, a second region, a second layer, and/or a second portion without departing from the teachings of the present disclosure.
In this disclosure, unless otherwise indicated, the term "co-layer disposed" is used to mean that two layers, components, members, elements, or portions may be formed by the same manufacturing process (e.g., patterning process, etc.), and that the two layers, components, members, elements, or portions are generally formed of the same material. For example, the two or more functional layers are arranged in the same layer, meaning that the functional layers arranged in the same layer may be formed using the same material layer and the same manufacturing process, so that the manufacturing process of the display substrate may be simplified.
In the present disclosure, unless otherwise indicated, the expression "patterning process" generally includes the steps of coating of photoresist, exposure, development, etching, stripping of photoresist, and the like. The expression "one patterning process" means a process of forming a patterned layer, feature, component, etc. using a single mask.
The stretchable display is an important development direction in flexible display, and after the OLED display panel has the stretchable capability, the deformation of the multiaxial curved surface can be realized. In order to make the OLED display panel stretchable, there are two general design ideas:
one is that the material is intrinsically stretchable, the material used for the OLED display panel has the stretchable capability, but the disadvantage of the design is that the high-performance semiconductor devices used in the current driving technology all need a high-temperature process of at least 300 ℃, and the device with elasticity has no capability of driving a light-emitting structure;
the other is a structure stretchable, the light emitting structure and the driving structure of the OLED display panel keep a rigid structure, a movable space and an elastic connection structure are formed in the display area of the OLED display panel through an opening or the like, so that the OLED display panel has a stretchable capability, the stretchable structure can be called an island-bridge stretchable structure, the OLED display panel adopting the stretchable structure can be called an island-bridge stretchable display panel, wherein the island area comprises at least one sub-pixel area, the bridge area connecting adjacent island areas comprises the connection structure with the stretchable capability, and an opening area is formed between the adjacent island areas.
Currently, stretchable display panels of the commonly used island bridge structure include two structural designs:
a stretchable display panel adopting the island bridge structure of the structure comprises a display area and a frame area surrounding the display area, wherein, as shown in fig. 1, the display area of the stretchable display panel adopting the island bridge structure of the structure comprises a plurality of island areas 101, an open area 102 positioned between adjacent island areas 101 and a bridge area 103 connecting adjacent island areas 101, the island areas 101 comprise at least one sub-pixel area, for example, one island area 101 shown in fig. 1 comprises three sub-pixel areas 1011 of red, green and blue, and the bridge area 103 comprises a wiring 1031. When stretched in a plane perpendicular to the light emitting direction of the stretchable display panel (XY plane in fig. 1), the elastic bridge region 103 may deform in a plane perpendicular to the light emitting direction of the stretchable display panel (XY plane in fig. 1).
Another structure is a "paper-cut hole", and the stretchable display panel adopting the island bridge structure of the structure includes a display area and a frame area surrounding the display area, where, as shown in fig. 2, the display area of the stretchable display panel adopting the island bridge structure of the structure includes a plurality of island areas 201, an opening area 202 located between adjacent island areas 201, and a bridge area 203 connecting adjacent island areas 101, the island area 201 includes at least one sub-pixel area, for example, one island area 201 shown in fig. 2 includes three sub-pixel areas 2011 of red, green and blue, and the bridge area 203 includes a trace 2031. When stretched in a plane perpendicular to the light emitting direction of the stretchable display panel (XY plane in fig. 2), the elastic bridge region 203 can be deformed in a plane perpendicular to the light emitting direction of the stretchable display panel (XY plane in fig. 2).
In the preparation of the stretchable display module, it is necessary to apply a protective film to the light-emitting side and the backlight side of the stretchable display panel of the island structure by transparent optical adhesive, respectively. The inventor finds that when stretching is performed on a plane perpendicular to the light emitting direction of the stretchable display panel, the stretchable display panel with the island bridge structure provided with the openings deforms in the plane perpendicular to the light emitting direction of the stretchable display panel, and also generates rotary distortion deformation in the light emitting direction of the stretchable display panel.
In view of this, as shown in fig. 3, one embodiment of the present disclosure provides a stretchable display module including a stretchable display panel 301, a first protective film 303 bonded to a light-emitting side of the stretchable display panel 301 through a first adhesive layer 302, and a second protective film 305 bonded to a backlight side of the stretchable display panel 301 through a second adhesive layer 304, as shown in fig. 4, the stretchable display panel 301 includes a display region 3011 and a frame region 3012 surrounding the display region 3011;
wherein, the front projection of the first adhesive layer 302 on the stretchable display panel 301 is located at the frame area 3012, the front projection of the second adhesive layer 304 on the stretchable display panel 301 is located at the frame area 3012, and in fig. 4, the center positions of the first adhesive layer 302 and the second adhesive layer 304 are shown by a dashed line frame 401.
Thus, in the stretchable display module provided in this embodiment, the first adhesive layer 302 for adhering the first protective film 303 and the second adhesive layer 304 for adhering the second protective film 305 are respectively designed to correspond to the frame region 3012 of the stretchable display panel 301 without adhering to the display region 3011 of the stretchable display panel 301, and since the first adhesive layer 302 and the second adhesive layer 304 have a certain thickness, there is a certain gap between the display region 3011 of the stretchable display panel 301 and the first protective film 303, and a certain gap is filled between the display region 3011 of the stretchable display panel 301 and the second protective film 305, and a certain gap is filled with a medium such as air. Therefore, when the stretchable display panel 301 is stretched in a plane (XY plane in fig. 4) perpendicular to the light emitting direction (Z direction in fig. 3), the first protective film 303 and the second protective film 305 can prevent the stretchable display panel 301 from being deformed in the light emitting direction (Z direction in fig. 3), so that the deformation of the stretchable display panel 301 in the light emitting direction (Z direction in fig. 3) can be prevented from contributing to the deformation of the plane (XY plane in fig. 4) perpendicular to the light emitting direction (Z direction in fig. 3) of the stretchable display panel 301, thereby improving the stretching performance of the stretchable display module.
It is understood that, since the adhesive layer for bonding the first protective film 303 and the second protective film 305 corresponds to the frame region 3012 of the stretchable display panel 301, the material thereof is not limited to the transparent optical adhesive.
It should be noted that, if only the front projection of the first adhesive layer 302 on the stretchable display panel 301 is located in the frame area 3012 and the second adhesive layer is a transparent optical adhesive covering the stretchable display panel 301 entirely, stretching in a plane (XY plane in fig. 4) perpendicular to the light emitting direction (Z direction in fig. 3) of the stretchable display panel 301 can be achieved, so that the first protective film 303 is prevented from inhibiting the deformation of the stretchable display panel 301 in the light emitting direction (Z direction in fig. 3) to improve the stretching performance of the stretchable display module. Similarly, if only the orthographic projection of the second adhesive layer 304 on the stretchable display panel 301 is located in the frame area 3012 and the first adhesive layer is a transparent optical adhesive covering the stretchable display panel 301 entirely, stretching in a plane (XY plane in fig. 4) perpendicular to the light emitting direction (Z direction in fig. 3) of the stretchable display panel 301 can be achieved, so that the deformation of the second protective film 305 in the light emitting direction (Z direction in fig. 3) of the stretchable display panel 301 is prevented from being inhibited, and the stretching performance of the stretchable display module is improved.
In a specific example, the first protective film 303 and the second protective film 305 may be elastic protective films, respectively, and the materials may be selected from one or a combination of several materials such as Polydimethylsiloxane (PDMS), natural rubber, nitrile rubber, hydrogenated styrene-butadiene block copolymer (Styrene Ethylene Butylene Styrene, SEBS), thermoplastic polyurethane elastomer rubber (Thermoplastic Polyurethanes, TPU), polyethylene naphthalate (Polyethylene Naphthalate, PEN), polyimide (Polyimide, PI), polyetherimide (PEI), polyethylene terephthalate (Polyethylene Terephthalate, PET), or polyphenylene sulfide (Polyphenylene Sulfide, PPS), respectively. The material has good tensile properties, so that the first protective film 303 and the second protective film 305 can be ensured to have good tensile properties, and the tensile properties of the stretchable display module can be ensured.
In a specific example, the first adhesive layer 302 and the second adhesive layer 304 may be photo-curable adhesives, pressure sensitive adhesives, and the like, and may be optical adhesives of epoxy adhesives, benzoic acid adhesives, and the like.
In one possible implementation, as shown in fig. 4, the display area 3011 of the stretchable display panel 301 includes a plurality of island areas 30111, open areas (not shown) between adjacent island areas 30111, and bridge areas (not shown) connecting adjacent island areas 30111, the island areas 30111 including at least one sub-pixel area, for example, one island area 30111 shown in fig. 4 includes three sub-pixel areas 301111 of red, green and blue, and the bridge areas include wirings (not shown). The alternating arrangement in the display area of the middle portion of the stretchable display panel 301 shown in fig. 3, for example, shows that the island region, the bridge region, and the open region in the display area are each discontinuous structures.
In one possible implementation, as shown in fig. 3 and 4, in the stretchable display module provided in this embodiment, the front projection of the first adhesive layer 302 on the stretchable display panel 301 surrounds the display area 3011, and the front projection of the second adhesive layer 304 on the stretchable display panel 301 surrounds the display area 3011.
Thus, as shown in fig. 3 and 4, the first adhesive layer 302 and the second adhesive layer 304 respectively have a continuous ring shape surrounding the display area 3011, so that better adhesion, sealing and protection effects can be achieved.
In a possible implementation manner, in the stretchable display module provided in this embodiment, the minimum distance between the front projection of the first adhesive layer 302 on the stretchable display panel 301 and the display area 3011 is greater than 0.3mm.
For example, as shown in fig. 3 and fig. 4, the minimum distance between the front projection of the first adhesive layer 302 on the stretchable display panel 301 and the display area 3011, that is, the minimum distance between the first adhesive layer 302 and the display area 3011 in the X direction, can avoid the blocking of the emergent light of the sub-pixel area by the first adhesive layer 302 due to the process error of the preparation position of the first adhesive layer 302 based on this implementation manner.
In one possible implementation, as shown in fig. 3 and fig. 4, in the stretchable display module provided in this embodiment, the front projection of the first adhesive layer 302 on the stretchable display panel 301 coincides with the front projection of the second adhesive layer 304 on the stretchable display panel 301. Thus, the stress uniformity of the first protective film 303 and the second protective film 305 on both sides of the stretchable display panel 301 during stretching can be improved, and the stretching performance of the stretchable display module can be further improved.
In one possible implementation manner, in the stretchable display module provided in this embodiment, the thickness of the first adhesive layer 302 is 5 μm to 400 μm, and the thickness of the second adhesive layer 304 is 5 μm to 400 μm, and it is understood that the thickness herein refers to the length in the light emitting direction (Z direction in fig. 3) of the stretchable display panel 301, and for example, the thickness of the first adhesive layer 302 and the second adhesive layer 304 is, for example, 5 μm to 10 μm in the case where the first adhesive layer 302 and the second adhesive layer 304 are, respectively, coating adhesive layers, such as adhesives, and for example, the thickness of the first adhesive layer 302 and the second adhesive layer 304 is, for example, on the order of hundred micrometers in the order of 100 μm to 400 μm in the case where the first adhesive layer 302 and the second adhesive layer 304 are, respectively. The first and second adhesive layers 302 and 304 are each, for example, 5 μm, 7 μm, 10 μm, 100 μm, 250 μm or 400 μm in thickness, and in addition, the first and second protective films 303 and 305 may be provided to have the same thickness. Based on the above, the stress uniformity of the first protective film 303 and the second protective film 305 on both sides of the stretchable display panel 301 during stretching can be improved, and the stretching performance of the stretchable display module can be further improved.
In a possible implementation manner, in the stretchable display module provided in this embodiment, for example, as shown in fig. 5, a side of the first protection film 303 facing the stretchable display panel 301 is coated with a first coating 501 having a friction coefficient smaller than a preset value, and a side of the second protection film 305 facing the stretchable display panel 301 is coated with a second coating 502 having a friction coefficient smaller than a preset value.
For example, as shown in fig. 3 and fig. 4, when the stretchable display panel 301 is stretched in a plane (XY plane in fig. 4) perpendicular to the light emitting direction (Z direction in fig. 3), the stretchable display panel 301 is also deformed in the light emitting direction (Z direction in fig. 3), so that friction may occur between the display area 3011 of the stretchable display panel 301 and the first protective film 303 and/or the second protective film 305, and such friction may affect the stretching performance of the stretchable display module. For example, as shown in fig. 5, the low friction coefficient coating layer can reduce the friction force of the friction, so as to reduce the influence of the friction on the tensile property of the tensile display module.
For example, in this implementation manner, the preset value is 0.5, that is, the first coating 501 and the second coating 502 are respectively low friction coefficient coatings with a friction coefficient less than 0.5, and may specifically be a silicone oil coating, a fluorocarbon coating, a Polytetrafluoroethylene (PTFE) coating, or the like.
For example, as shown in fig. 5, the first coating layer 501 is entirely coated on the side of the first protective film 303 facing the stretchable display panel 301, and the second coating layer 502 is entirely coated on the side of the second protective film 305 facing the stretchable display panel 301. In addition, it is also possible to apply the first coating layer to the region of the first protective film 303 corresponding to the display region 3011 of the stretchable display panel 301 in front projection toward the stretchable display panel 301, and the second coating layer to the region of the second protective film 305 corresponding to the display region 3011 of the stretchable display panel 301 in front projection toward the stretchable display panel 301, so that it is also possible to achieve reduction of friction force in which friction may occur between the display region 3011 of the stretchable display panel 301 and the first protective film 303 and the second protective film 305.
In a possible implementation manner, in the stretchable display module provided in this embodiment, the first adhesive layer 302 and the second adhesive layer 304 are frame sealing adhesives, and the enclosed cavity formed by enclosing the first protective film 303, the first adhesive layer 302, the stretchable display panel 301, the second adhesive layer 304 and the second protective film 305 is filled with an organic solution.
For example, as shown in fig. 3, when the display region 3011 of the stretchable display panel 301 and the first protective film 303 are not bonded and have a certain gap, and air is filled in the gap or the gap forms an air layer, there is a possibility that a problem of light extraction occurs at the interface between the two because the refractive index of air is smaller than that of the stretchable display panel 301. In the present embodiment, the gap is filled with an organic solution with a high refractive index, such as a liquid optical adhesive, and the organic solution is close to the refractive index of the stretchable display panel 301, so that the light extraction problem can be reduced, and the organic solution can avoid the reaction between the solution and the OLED light emitting device to damage the device. For example, liquid optical adhesives, unlike conventional cured optical adhesives, have a viscosity of less than 400Cps, i.e., liquid optical adhesives do not form solids or elastomers, but rather are in liquid form. The liquid optical adhesive includes, for example, any one of silicone-based liquid optical adhesives and acrylic-based liquid optical adhesives. Illustratively, the organic solution fills the enclosed cavity formed by the first protective film 303, the first adhesive layer 302, the stretchable display panel 301, the second adhesive layer 304, and the second protective film 305.
Another embodiment of the present disclosure provides a method for manufacturing a stretchable display module, including steps S1 and S2, specifically including the following steps:
s1, preparing a stretchable display panel, wherein the stretchable display panel comprises a display area and a frame area surrounding the display area.
In one possible implementation, step S1 further includes:
and preparing a stretchable display panel on the carrier plate, wherein the stretchable display panel comprises a display area and a frame area surrounding the display area, the display area comprises a plurality of island areas, open hole areas positioned between adjacent island areas and bridge areas connected with the adjacent island areas, and the island areas comprise at least one sub-pixel area.
In a specific example, fig. 6 shows a partial structural section of an island region edge sub-pixel region including the left side of the dotted line and a bridge region and an opening region including the right side of the dotted line in a stretchable display panel of an island bridge structure of a "curved bridge" structure, taking the stretchable display panel as an example of the stretchable display panel of the island bridge structure of the "curved bridge" structure shown in fig. 6, the preparation of the stretchable display panel on a carrier plate, for example, includes the steps of:
firstly, a flexible substrate 602 such as Polyimide (PI) is formed on a carrier 601, a Barrier layer (Barrier) 603 such as silicon nitride, a Buffer layer (Buffer) 604 such as silicon oxide and an amorphous silicon layer are sequentially deposited on the flexible substrate 602, and after a high Wen Quqing, an Excimer Laser Annealing (ELA) process is adopted to convert the amorphous silicon layer into a polysilicon layer;
then, exposing and etching the polysilicon layer to form a channel layer pattern, wherein the channel layer can comprise partial ion doping to obtain an Active layer 605;
then, a first gate insulating layer (GI) 606 is formed by deposition or the like;
then, a Gate metal layer is deposited and patterned to form first gates (gates) 607 and 608;
then, a second gate insulating layer (GI) 609 is formed by deposition or the like;
then, a Gate metal layer is deposited and patterned to form a second Gate (Gate) 610;
then, an interlayer dielectric layer (ILD) 611 is formed by deposition or the like, and exposure etching is performed to form a via hole exposing the active layer 605, and at the same time, the barrier layer, the buffer layer, the first gate insulating layer, and the second gate insulating layer of the bridge region need to be etched all away in this step to expose the flexible substrate 602, such as Polyimide (PI);
then, a first source drain metal layer (SD) 612 is formed by deposition or the like, and patterned to form a source electrode and a drain electrode, and at the same time, a first layer trace 692 is formed in the bridge region and is arranged in the same layer as the first source drain metal layer 612;
then, a first Planarization Layer (PLN) 613 is formed by deposition or the like, via holes exposing the source are opened, and at the same time, a first organic coating layer 693 is formed on the bridge region to cover the first layer trace 692, and the first organic coating layer 693 and the first planarization layer 613 are arranged on the same layer;
then, a second source drain metal layer (SD) 614 is formed by deposition or the like, and patterned to form metal traces and a connection electrode connected to the source electrode through a via hole of the first planarization layer 613, and at the same time, a second layer trace 694 disposed on the same layer as the metal traces is formed in the bridge region in this step;
then, a second Planarization Layer (PLN) 615 is formed by deposition or the like to form a via hole exposing the connection electrode, and at the same time, a second organic coating layer 695 is formed in the bridge region to cover the second layer trace 694, and the second organic coating layer 695 and the second planarization layer 615 are arranged in the same layer;
then, a first passivation layer (PVX) 616 is formed by deposition or the like and patterned, without leaving the first passivation layer of inorganic material in the bridge region;
then, an undercut structure is masked on the second planarization layer 615 based on the first passivation layer 616;
then, a second passivation layer (PVX) 617 is formed by deposition or the like, and the second passivation layer 617 and the second passivation layer 616 are subjected to exposure etching to form a via hole exposing a connection electrode formed by the second source drain metal layer (SD) 614, the second passivation layer 617 covers the undercut structure of the second planarization layer 615, and the second passivation layer of inorganic material is not remained in the bridge region;
then, an anode metal layer is deposited and patterned to form an anode 618 connected to the connection electrode through a via penetrating the second passivation layer 617 and the second passivation layer 616, the anode 618 being, for example, a stacked structure of Indium Tin Oxide (ITO)/silver (Ag)/Indium Tin Oxide (ITO);
then, a Pixel Defining Layer (PDL) 618 is formed by a patterning process such as coating exposure;
then, an organic light-emitting layer 619 is formed by inkjet printing, vapor deposition, or the like, and a Cathode (CTD) 620 is formed;
then, a first inorganic encapsulation layer 621, a patterned organic encapsulation layer 622, and a second inorganic encapsulation layer 623 are sequentially formed to form a stacked encapsulation structure;
then, the inorganic encapsulation layer is removed in the open area by an exposure etching process to expose the flexible substrate 602 such as PI;
finally, the flexible substrate 602, such as PI, of the opening area is etched to form a via hole, again through an exposure etching process, resulting in a stretchable display panel as shown in fig. 6.
S2, bonding a first protective film on the light emergent side of the stretchable display panel through a first adhesive layer, and bonding a second protective film on the backlight side of the stretchable display panel through a second adhesive layer; the front projection of the first adhesive layer on the stretchable display panel is located in the frame area, and the front projection of the second adhesive layer on the stretchable display panel is located in the frame area.
With respect to step S2, the present embodiment provides two possible implementations:
in a first possible implementation manner, step S2 further includes:
forming a first adhesive as a first adhesive layer at a position of the first protective film near the edge;
bonding the first protective film on the light emitting side of the stretchable display panel formed on the carrier plate through a first adhesive, wherein the orthographic projection of the first adhesive on the stretchable display panel is positioned in a frame area of the stretchable display panel, and a gap filled with air is formed between the display area of the stretchable display panel and the first protective film;
separating the stretchable display panel from the carrier plate by using processes such as laser peeling;
forming a second adhesive as a second adhesive layer at a position of the second protective film near the edge;
and bonding the second protective film on the backlight side of the stretchable display panel through a second adhesive, wherein the orthographic projection of the second adhesive on the stretchable display panel is positioned in a frame area of the stretchable display panel, a gap filled with air is formed between the display area of the stretchable display panel and the second protective film, and the first protective film, the first adhesive, the stretchable display panel, the second adhesive and the second protective film enclose to form a closed cavity filled with air, so that the preparation of the stretchable display module is completed.
Further, forming the first adhesive as the first adhesive layer at a position of the first protective film near the edge may include: a first coating layer having a friction coefficient smaller than a preset value is applied to the first protective film, and then a first adhesive is formed as a first adhesive layer at a position of the first coating layer near the edge. Forming the second adhesive as the second adhesive layer at a position of the second protective film near the edge may include: and coating a second coating layer with a friction coefficient smaller than a preset value on the second protective film, and then forming a second adhesive serving as a second adhesive layer at a position, close to the edge, of the second coating layer.
In a second possible implementation manner, step S2 further includes:
forming a first frame sealing adhesive which surrounds the display area and is used as a first adhesive layer in a frame area of the light-emitting side of the stretchable display panel formed on the carrier plate;
adhering the first protective film to the light emitting side of the stretchable display panel through a first frame sealing adhesive, wherein a gap filled with air is formed between the display area of the stretchable display panel and the first protective film;
separating the stretchable display panel from the carrier plate by using processes such as laser peeling;
forming a second frame sealing adhesive which surrounds the display area and is used as a second adhesive layer in a frame area on the backlight side of the stretchable display panel;
and adhering the second protective film to the backlight side of the stretchable display panel through the second seal frame adhesive, wherein an air-filled gap is formed between the display area of the stretchable display panel and the second protective film, and the first protective film, the first adhesive, the stretchable display panel, the second adhesive and the second protective film are enclosed to form an air-filled closed cavity, so that the preparation of the stretchable display module is completed.
Further, after forming the second seal adhesive as the second adhesive layer around the display area at the frame area of the backlight side of the stretchable display panel and before adhering the second protective film to the backlight side of the stretchable display panel through the second seal adhesive, the method may further include: and filling organic solution into a cavity formed by enclosing the first protective film, the first frame sealing adhesive, the stretchable display panel and the second frame sealing adhesive from the backlight side of the stretchable display panel. Thus, a gap filled with an organic solution is formed between the display area of the stretchable display panel and the first protective film, and after the second protective film is adhered to the backlight side of the stretchable display panel through the second seal frame, a gap filled with an organic solution is formed between the display area of the stretchable display panel and the second protective film, and the first protective film, the first adhesive, the stretchable display panel, the second adhesive and the second protective film enclose a closed cavity filled with an organic solution.
Further, adhering the first protective film to the light-emitting side of the stretchable display panel through the first seal adhesive may include: and coating a first coating with a friction coefficient smaller than a preset value on the first protective film, and then adhering one side of the first protective film coated with the first coating to the light emitting side of the stretchable display panel through a first frame sealing adhesive. Bonding a second protective film to the backlight side of the stretchable display panel through the second frame sealing adhesive may include: and coating a second coating with a friction coefficient smaller than a preset value on the second protective film, and then adhering one side of the second protective film coated with the second coating to the backlight side of the stretchable display panel through a second frame sealing adhesive.
Another embodiment of the present disclosure provides a stretchable display device, including the stretchable display module provided in the foregoing embodiment. The stretchable display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a display, a digital photo frame, a navigator, etc., which is not limited in this embodiment.
It should be apparent that the foregoing examples of the present disclosure are merely illustrative of the present disclosure and not limiting of the embodiments of the present disclosure, and that various other changes and modifications may be made by one of ordinary skill in the art based on the foregoing description, and it is not intended to be exhaustive of all embodiments, and all obvious changes and modifications that come within the scope of the present disclosure are intended to be embraced by the technical solution of the present disclosure.
Claims (10)
1. The stretchable display module is characterized by comprising a stretchable display panel, a first protective film and a second protective film, wherein the first protective film is adhered to the light emitting side of the stretchable display panel through a first adhesive layer, the second protective film is adhered to the backlight side of the stretchable display panel through a second adhesive layer, and the stretchable display panel comprises a display area and a frame area surrounding the display area;
the orthographic projection of the first adhesive layer on the stretchable display panel is positioned in the frame area, and/or the orthographic projection of the second adhesive layer on the stretchable display panel is positioned in the frame area.
2. The stretchable display module according to claim 1, wherein an orthographic projection of the first adhesive layer on the stretchable display panel surrounds the display area and/or an orthographic projection of the second adhesive layer on the stretchable display panel surrounds the display area.
3. The stretchable display module according to claim 1, wherein a minimum distance between an orthographic projection of the first adhesive layer on the stretchable display panel and the display area is greater than 0.3mm.
4. The stretchable display module according to claim 1, wherein an orthographic projection of the first adhesive layer on the stretchable display panel coincides with an orthographic projection of the second adhesive layer on the stretchable display panel.
5. The stretchable display module according to claim 1, wherein the first glue layer has a thickness of 5 μm-400 μm and/or the second glue layer has a thickness of 5 μm-400 μm.
6. The stretchable display module according to claim 1, wherein a side of the first protective film facing the stretchable display panel is coated with a first coating having a friction coefficient smaller than a preset value, and/or a side of the second protective film facing the stretchable display panel is coated with a second coating having a friction coefficient smaller than a preset value.
7. The stretchable display module according to claim 2, wherein the display area comprises a plurality of island areas, an open area between adjacent island areas, and a bridge area connecting adjacent island areas, the island areas comprise at least one sub-pixel area, the first adhesive layer and the second adhesive layer are respectively frame sealing adhesives, and a closed cavity formed by enclosing the first protective film, the first adhesive layer, the stretchable display panel, the second adhesive layer and the second protective film is filled with an organic solution.
8. A stretchable display device comprising a stretchable display module according to any of claims 1-7.
9. The preparation method of the stretchable display module is characterized by comprising the following steps of:
preparing a stretchable display panel, the stretchable display panel comprising a display area and a bezel area surrounding the display area;
bonding a first protective film on the light emergent side of the stretchable display panel through a first adhesive layer, and bonding a second protective film on the backlight side of the stretchable display panel through a second adhesive layer; the front projection of the first adhesive layer on the stretchable display panel is located in the frame area, and/or the front projection of the second adhesive layer on the stretchable display panel is located in the frame area.
10. The method of claim 9, wherein the step of determining the position of the substrate comprises,
the preparing a stretchable display panel includes:
preparing a stretchable display panel on a carrier plate, wherein the stretchable display panel comprises a display area and a frame area surrounding the display area, the display area comprises a plurality of island areas, open pore areas positioned between adjacent island areas and bridge areas connected with the adjacent island areas, and the island areas comprise at least one sub-pixel area;
the bonding the first protective film on the light emitting side of the stretchable display panel through the first adhesive layer, and bonding the second protective film on the backlight side of the stretchable display panel through the second adhesive layer includes:
forming a first frame sealing adhesive which surrounds the display area and serves as a first adhesive layer in a frame area of the light emitting side of the stretchable display panel;
adhering a first protective film to the light emitting side of the stretchable display panel through the first frame sealing adhesive;
separating the stretchable display panel from the carrier plate;
forming a second frame sealing adhesive which surrounds the display area and is used as a second adhesive layer in a frame area on the backlight side of the stretchable display panel;
filling organic solution into a cavity formed by enclosing the first protective film, the first frame sealing glue, the stretchable display panel and the second frame sealing glue from the backlight side of the stretchable display panel;
and adhering a second protective film to the backlight side of the stretchable display panel through the second frame sealing adhesive.
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