CN115843207A - Flexible OLED display panel and manufacturing method thereof - Google Patents
Flexible OLED display panel and manufacturing method thereof Download PDFInfo
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- CN115843207A CN115843207A CN202310148334.2A CN202310148334A CN115843207A CN 115843207 A CN115843207 A CN 115843207A CN 202310148334 A CN202310148334 A CN 202310148334A CN 115843207 A CN115843207 A CN 115843207A
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Abstract
The invention provides a flexible OLED display panel and a manufacturing method thereof, wherein the flexible OLED display panel comprises a first plane display area, a foldable display area and a second plane display area which are sequentially and adjacently arranged; the flexible cover plate is arranged on the flexible OLED display substrate; the colloid layer is arranged between the flexible OLED display substrate and the flexible cover plate, orthographic projections of a first colloid layer, a second colloid layer and a third colloid layer of the colloid layer on the flexible OLED display substrate respectively fall into the first plane display area, the foldable display area and the second plane display area, and the elastic modulus of the second colloid layer is lower than that of the first colloid layer and that of the third colloid layer. The invention can reduce the folding crease of the folding area of the flexible display device and prolong the service life.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible OLED display panel and a manufacturing method thereof.
Background
With the development of technology, flexible display devices, such as flexible OLED (Organic Light-Emitting Diode) display devices, have been widely used in recent years, so that the flexible display devices have been greatly improved from the size of the screen to the quality of the display. In the assembly process of the flexible OLED display substrate and the flexible cover plate of the conventional flexible display, an Optical Clear Adhesive (OCA) dry film is usually disposed on the joint surface of the flexible OLED display substrate and the flexible cover plate, the OCA dry film is thick and has process defects, and after repeated folding, a fold is inevitably generated in a folding region of the OCA dry film, which affects the service life of the flexible display device.
Disclosure of Invention
The invention aims to provide a flexible OLED display panel and a manufacturing method thereof, which can avoid crease marks generated in a folding area due to repeated folding. The specific scheme is as follows:
according to a specific embodiment of the present invention, in a first aspect, the present invention provides a flexible OLED display panel including:
the flexible OLED display substrate comprises a first plane display area, a foldable display area and a second plane display area which are sequentially and adjacently arranged;
the flexible cover plate is arranged on the flexible OLED display substrate; and
a gel layer disposed between the flexible OLED display substrate and the flexible cover sheet configured to bond the flexible OLED display substrate and the flexible cover sheet,
the colloid layer comprises a first colloid layer, a second colloid layer and a third colloid layer, orthographic projections of the first colloid layer, the second colloid layer and the third colloid layer on the flexible OLED display substrate respectively fall into the first plane display area, the foldable display area and the second plane display area, and the elastic modulus of the second colloid layer is lower than that of the first colloid layer and the third colloid layer.
Optionally, the first colloid layer, the second colloid layer and the third colloid layer are formed on the flexible OLED display substrate in an inkjet printing manner.
Optionally, the inkjet formation height of the second colloid layer is greater than the inkjet formation height of the first colloid layer and the third colloid layer.
Optionally, the flexible OLED display panel further includes: the spacers are arranged between the flexible OLED display substrate and the flexible cover plate and at least arranged along two side boundaries of the foldable display area, orthographic projections of the spacers on the flexible OLED display substrate fall into the first plane display area and the second plane display area, and orthographic projections of the spacers on the flexible OLED display substrate are at least located at the edges of the first plane display area and the second plane display area close to the foldable display area.
Optionally, the plurality of spacers are circumferentially arranged at intervals along the edges of the first and second planar display regions, and the arrangement density of the plurality of spacers at the boundaries of the two sides of the foldable display region is greater than that at other positions.
Optionally, the material and the elastic modulus of the first colloid layer and the third colloid layer are the same.
Optionally, the elastic modulus of the second colloid layer is at least 0.5Gpa less than the elastic modulus of the first and third colloid layers.
According to an embodiment of the present invention, in another aspect, the present invention provides a method of manufacturing a flexible OLED display panel, the method including:
providing a flexible OLED display substrate and a flexible cover plate, wherein the flexible OLED display substrate comprises a first plane display area, a foldable display area and a second plane display area which are sequentially and adjacently arranged;
respectively forming a first colloid layer, a second colloid layer and a third colloid layer in a first plane display area, a foldable display area and a second plane display area of the flexible OLED display substrate, wherein the elastic modulus of the second colloid layer is lower than that of the first colloid layer and that of the third colloid layer; and
and the flexible cover plate is attached to one side of the first colloid layer, the second colloid layer and the third colloid layer, which is arranged on the flexible OLED display substrate.
Optionally, the forming a first colloid, a second colloid, and a third colloid in the first planar display area, the foldable display area, and the second planar display area of the flexible OLED display substrate respectively includes:
and respectively forming a first colloid, a second colloid and a third colloid in a first plane display area, a foldable display area and a second plane display area of the flexible OLED display substrate in an ink-jet printing mode, wherein the ink-jet forming height of the second colloid layer is greater than the ink-jet forming height of the first colloid layer and the ink-jet forming height of the third colloid layer.
Optionally, before attaching the flexible cover plate to one side of the flexible OLED display substrate on which the first glue, the second glue, and the third glue are disposed, the manufacturing method further includes:
forming a plurality of spacers on a face of the flexible cover sheet to be attached to the flexible OLED display substrate,
when the flexible cover plate is attached to one side of the flexible OLED display substrate, which is provided with the first colloid, the second colloid and the third colloid, the plurality of spacers are arranged along the boundaries of two sides of the foldable display area at least, the orthographic projections of the plurality of spacers on the flexible OLED display substrate fall into the first plane display area and the second plane display area, and the orthographic projections of the plurality of spacers on the flexible OLED display substrate are at least positioned at the edges of the first plane display area and the second plane display area, which are close to the foldable display area.
According to the flexible OLED display panel and the manufacturing method thereof, provided by the invention, the colloid layers with different elastic moduli are arranged between the flexible OLED display substrate and the flexible cover plate, so that the crease of a folding area caused by the conventional OCA dry film process can be reduced, and the service life of a flexible display device is prolonged.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 schematically shows a schematic cross-sectional structure diagram of a flexible OLED display panel provided in an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structural diagram of a flexible OLED display substrate in a flexible OLED display panel according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a flexible OLED display panel provided by an embodiment of the present invention in a folded state and an unfolded state;
fig. 4 schematically shows a schematic diagram of a spacer disposed on a flexible OLED display panel provided by an embodiment of the present invention;
FIG. 5 is a flow chart of a method for manufacturing a flexible OLED display panel according to an embodiment of the present invention;
fig. 6 schematically shows a cross-sectional structure of the flexible OLED display panel corresponding to each step in fig. 5.
The reference numerals are represented as:
100. a flexible OLED display panel; 110. a flexible OLED display substrate; 111. a first planar display area; 113. a foldable display area; 115. a second planar display area; 1101. a display substrate; 1103. a display functional layer; 11031. a driving circuit layer; 11032. a first electrode layer; 11033. a light-emitting functional layer; 11034. a second electrode layer; 11035 protective layer; 130. a flexible cover plate; 150. a colloidal layer; 151. a first colloid layer; 153. a second colloid layer; 155. a third colloid layer; 170. a spacer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, 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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe embodiments of the present invention, they should not be limited to these terms.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, the recitation of an element by the phrase "comprising a" does not exclude the presence of additional like elements in a commodity or device comprising the element.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Fig. 1 schematically shows a cross-sectional structure of a flexible OLED display panel according to an embodiment of the present invention, and referring to fig. 1, according to an embodiment of the present invention, the present invention provides a flexible OLED display panel 100 including a flexible OLED display substrate 110, a flexible cover plate 130, and a colloid layer 150, wherein the flexible cover plate 130 is disposed on the flexible OLED display substrate 110, and the colloid layer 150 is disposed between the flexible OLED display substrate 110 and the flexible cover plate 130 and configured to bond the flexible OLED display substrate 110 and the flexible cover plate 130.
Fig. 2 schematically shows a schematic cross-sectional structure diagram of a flexible OLED display substrate in a flexible OLED display panel provided in an embodiment of the present invention, please refer to fig. 2, where the flexible OLED display substrate 110 is a main display structure of the flexible OLED display panel 100, and generally includes a display base 1101 and a display function layer 1103 formed on the display base and forming the display structure, the display base 1101 is, for example, a PI substrate, and the display function layer 1103 includes, for example, a driving circuit layer 11031, a first electrode layer 11032, a light emitting function layer 11033, a second electrode layer 11034, and a protection layer 11035 sequentially disposed on the display base 1101. The driving circuit layer 11031 includes OLED driving circuits arranged in an array to provide driving voltages to the OLED devices of the pixels, respectively. The first electrode layer 11032 is, for example, a cathode layer, the second electrode layer 11034 is, for example, an anode layer, the first electrode layer 11032, the second electrode layer 11034 and the light emitting functional layer 11033 therebetween form an array-arranged OLED device, and the light emitting functional layer 11035 includes, for example, an electron emitting layer, an electron transport layer, a light emitting layer, a hole transport layer, and a hole emitting layer, which are sequentially stacked. The protective layer 11035 includes, for example, a multi-layered organic/inorganic stack structure alternately disposed to protect the OLED device and its driving circuit.
In some embodiments, the display functional layer 1103 may further include a touch layer, a color film layer, a polarization layer, and the like, and the above functional layers are not necessarily present at the same time, and the specific positions may also be adjusted according to actual requirements, and fig. 2 only schematically shows the above display substrate and some of the functional layers.
The flexible OLED display substrate 110 at least includes a foldable display region 113, a display substrate of the foldable display region 113 may be made of a bendable flexible material such as plastic, and various film layers forming a display structure are formed on the flexible display substrate, including but not limited to: a light emitting layer, a touch layer, a polarization layer, etc., each of the above-mentioned film layers constituting the display structure is also a flexible film layer made of a flexible material, so that the foldable display region 113 can be deformed by a force, such as bending, folding, etc.
In some embodiments, the flexible OLED display substrate 110 includes a first planar display region 111, a foldable display region 113, and a second planar display region 115, which are adjacently arranged in sequence. The foldable display area 113 is a flexible display structure and can deform under the action of force, and the first planar display area 111 and the second planar display area 115 are rigid display structures and cannot deform even under the action of certain external force.
Fig. 3 is a schematic diagram illustrating a flexible OLED display panel provided by an embodiment of the present invention in a folded state and an unfolded state, and referring to fig. 3, the flexible OLED display panel 100 can have two states, a folded state and an unfolded state, when being used. When the flexible OLED display panel 100 is in a folded state, the foldable display area 113 of the flexible OLED display substrate 110 is bent, and the foldable display area 113 is a curved surface; when the flexible OLED display panel 100 is in an unfolded state, the foldable display region 113 is a plane and is substantially in the same plane as the first and second planar display regions 111 and 115.
In some embodiments, the flexible OLED display substrate 110 may be folded in half along a central axis of the foldable display region 113. In some embodiments, the foldable display area 113 is a rectangular area, and the foldable display area 113 is folded along a central axis of the rectangular area when being folded.
The flexible cover sheet 130 is disposed on the flexible OLED display substrate 110, generally on the uppermost layer of the flexible OLED display panel 100. The flexible cover 130 is made of transparent material, and one or more of glass, silicon nitride, silicon oxide, aluminum oxide, plastic PI, and PET may be selected.
The colloid layer 150 is disposed between the flexible OLED display substrate 110 and the flexible cover plate 130, and is configured to bond the flexible OLED display substrate 110 and the flexible cover plate 130. The foldable display area 113 and the planar display area (including the first planar display area 111 and the second planar display area 115) of the flexible OLED display substrate 110 correspond to the colloid layers with different elastic moduli, respectively. Wherein the elastic modulus of the foldable display area 113 is lower than that of the flat display area.
In some embodiments, the flexible OLED display substrate 110 includes a first planar display region 111, a foldable display region 113, and a second planar display region 115, which are adjacently arranged in sequence. Accordingly, the glue layer includes a first glue layer 151, a second glue layer 153, and a third glue layer 155. Wherein orthographic projections of the first, second and third colloid layers 151, 153 and 155 on the flexible OLED display substrate 110 fall within the first, foldable and second planar display regions 111, 113 and 115, respectively. The elastic modulus of the second colloid layer 153 is lower than the elastic modulus of the first colloid layer 151 and the third colloid layer 155.
The colloid layer 150 is formed on the surface of the flexible OLED display substrate 110 by means of inkjet printing. Specifically, the first colloid layer 151, the second colloid layer 153 and the third colloid layer 155 are respectively formed at corresponding positions of the flexible OLED display substrate 110 by adopting an inkjet printing method. The inkjet printing method may be specifically implemented by spraying 111 a Liquid Optical Clear Adhesive (LOCA) on a corresponding position of the bonding surface of the flexible OLED display substrate 110 by a printer. Compared with the prior art that the OCA dry film is directly arranged on the binding surface of the flexible OLED display substrate 110, the LOCA glue is adopted, so that different glue materials can be mixed, and different thicknesses can be realized in different areas of the binding surface of the flexible OLED display substrate 110.
In some embodiments, the liquid adhesive may be one or a mixture of epoxy, acrylic, silicone rubber, and the like.
In some embodiments, the elastic modulus of the second colloid layer 153 is lower than the elastic moduli of the first colloid layer 151 and the third colloid layer 155, and the elastic moduli of the first colloid layer 151 and the third colloid layer 155 are the same. In some embodiments, the elastic modulus of the second glue layer 153 is at least 0.5Gpa less than the elastic modulus of the first and third glue layers 151 and 155. The foldable display area can be made more flexible by providing the area with a glue layer having a lower modulus of elasticity.
In some embodiments, the ink-jet formation height of the second colloid layer 153 is greater than the ink-jet formation height of the first colloid layer 151 and the third colloid layer 155.
In some embodiments, a liquid adhesive L1 is inkjet printed on the first and second planar display regions 111 and 115 of the flexible OLED display substrate 110, and the inkjet forming height is H1; the liquid adhesive L2 is inkjet printed in the foldable display area 113 of the flexible OLED display substrate 110, and is inkjet formed to have a height H2. Wherein the colloid viscosity of L1 and L2 is basically the same (the colloid viscosity can be in the range of 0 to 15 cP), the elastic modulus of L2 is smaller than that of L1, and H2 is larger than H1. Can make this region have better pliability through set up the glue film that elastic modulus is littleer and thickness is higher in collapsible display area, and the reconversion that can be better avoids or alleviates the crease.
By ink-jet printing two different liquid adhesives in different areas of the flexible OLED display substrate 110 and forming different thicknesses, the stability of the flexible folding screen after frequent folding can be optimized, and the display and use effects of the flexible folding screen without creases can be still maintained after frequent bending.
Fig. 4 schematically illustrates a schematic diagram of a spacer disposed on the flexible OLED display panel provided in an embodiment of the present invention, and in some embodiments, as shown in fig. 4, the flexible OLED display panel 100 may further include a plurality of spacers 170. The plurality of spacers 170 is disposed between the flexible OLED display substrate 110 and the flexible cover sheet 130. The plurality of spacers 170 are disposed at least along two side boundaries of the foldable display region 113, the orthographic projections of the plurality of spacers 170 on the flexible OLED display substrate 110 fall into the first planar display region 111 and the second planar display region 115, and the orthographic projections of the plurality of spacers 170 on the flexible OLED display substrate 110 are at least located at the edges of the first planar display region 111 and the second planar display region 115 close to the foldable display region 113.
The plurality of spacers 170 are disposed on two sides of the foldable display region 113, which can help to further distinguish the foldable display region 113 from the planar display regions (the first planar display region 111 and the second planar display region 115), and the plurality of spacers 170 can separate the second colloid layer 153 from the first colloid layer 151 and the third colloid layer 155, so that the second colloid layer 153 is prevented from flowing at the boundary with the first colloid layer 151 and the third colloid layer 155, and the creep of the foldable display region 113 during the folding process can be reduced.
In some embodiments, the plurality of spacers 170 are circumferentially spaced along the edges of the first and second planar display regions 111 and 115 to ensure uniform spacing between the flexible OLED display substrate 110 and the flexible cover sheet 130.
In some embodiments, the arrangement density of the plurality of spacers 170 at the boundaries of both sides of the foldable display region 113 is greater than that at other positions. The division can be further partitioned by the above arrangement, and creep of the foldable display area 113 can be reduced.
FIG. 5 is a flow chart of a method for manufacturing a flexible OLED display panel according to an embodiment of the present invention; fig. 6 schematically shows a cross-sectional structure of the flexible OLED display panel corresponding to each step in fig. 5. Referring to fig. 5 and fig. 6, the present invention further provides a method for manufacturing a flexible OLED display panel, the method comprising:
step S10, providing a flexible OLED display substrate 110 and a flexible cover plate 130, wherein the flexible OLED display substrate 110 comprises a first planar display area 111, a foldable display area 113 and a second planar display area 115 which are sequentially and adjacently arranged;
in this step, the flexible OLED display substrate 110 is a main display structure of the flexible OLED display panel 100, and generally includes a display substrate and various film layers, such as a light emitting layer, a touch layer, a polarization layer, and the like, formed on the display substrate to constitute the display structure.
The display substrate of the foldable display area 113 may be made of a bendable flexible material such as plastic, on which various film layers constituting a display structure are formed, including but not limited to: a color film layer, a touch layer, a polarization layer, etc., each of the above film layers constituting the display structure is also a flexible film layer made of a flexible material, so that the foldable display region 113 can be deformed, such as bent, folded, etc., under the action of force. The first and second flat display regions 111 and 115 are rigid display structures and do not deform even when subjected to a certain external force.
Step S20, forming a first colloid layer 151, a second colloid layer 153 and a third colloid layer 155 in the first planar display area 111, the foldable display area 113 and the second planar display area 115 of the flexible OLED display substrate 110, respectively, wherein the elastic modulus of the second colloid layer 153 is lower than the elastic modulus of the first colloid layer 151 and the third colloid layer 155;
in this step, forming the first colloid layer 151, the second colloid layer 153 and the third colloid layer 155 on the first planar display area 111, the foldable display area 113 and the second planar display area 115 of the flexible OLED display substrate 110, respectively, may form the first colloid layer 151, the second colloid layer 153 and the third colloid layer 155 on the first planar display area 111, the foldable display area 113 and the second planar display area 115 of the flexible OLED display substrate 110 by using an inkjet printing method.
Specifically, the first colloid layer 151, the second colloid layer 153 and the third colloid layer 155 are respectively formed at corresponding positions of the flexible OLED display substrate 110 by adopting an inkjet printing method. The inkjet printing method may be specifically implemented by spraying a Liquid Optical Clear Adhesive (LOCA) on a corresponding position of the bonding surface of the flexible OLED display substrate 110 by a printer. Compared with the prior art that the OCA dry film is directly arranged on the binding surface of the flexible OLED display substrate 110, the LOCA adhesive is adopted, so that different adhesive materials can be mixed, and different thicknesses can be realized in different areas of the binding surface of the flexible OLED display substrate 110. And the LOCA can be adopted to not only reduce the process defects brought by the existing OCA dry film technology, such as bubbles, substrate damage, folding marks of a folding area and the like, but also further accurately control the thickness of the colloid layer, reduce the thickness of the colloid layer to be below 10 mu and further reduce the size of the flexible electronic product.
In some embodiments, the liquid adhesive may be one or a mixture of epoxy, acrylic, silicone rubber, and the like.
In some embodiments, the elastic modulus of the first and third colloid layers 151 and 155 are the same. In some embodiments, the elastic modulus of the second glue layer 153 is at least 0.5Gpa less than the elastic modulus of the first and third glue layers 151 and 155.
In some embodiments, the ink-jet formation height of the second colloid layer 153 is greater than the ink-jet formation height of the first colloid layer 151 and the third colloid layer 155.
In some embodiments, a liquid adhesive L1 is inkjet printed on the first and second planar display regions 111 and 115 of the flexible OLED display substrate 110, and the inkjet forming height is H1; the liquid adhesive L2 is inkjet printed in the foldable display area 113 of the flexible OLED display substrate 110, and is inkjet formed to have a height H2. Wherein the colloid viscosity of L1 is the same as that of L2 (the colloid viscosity can be in the range of 0-15 cP), the elastic modulus of L2 is less than that of L1, and H2 is more than H1.
By ink-jet printing two different liquid adhesives in different areas of the flexible OLED display substrate 110 and forming shapes with different thicknesses, the stability of the flexible folding screen after frequent folding can be optimized, and the display and use effects of the flexible folding screen without creases can be still maintained after frequent bending.
Step S30, attaching the flexible cover plate 130 to one side of the flexible OLED display substrate 110, where the first glue layer 151, the second glue layer 153 and the third glue layer 155 are disposed.
In some embodiments, before attaching the flexible cover plate 130 to the side of the flexible OLED display substrate 110 provided with the first glue layer 151, the second glue layer 153 and the third glue layer 155, the manufacturing method further includes: a plurality of spacers 170 are formed on the surface of the flexible cover plate 130 to be attached to the flexible OLED display substrate 110, when the flexible cover plate 130 is attached to one side of the flexible OLED display substrate 110, where the first glue layer 151, the second glue layer 153 and the third glue layer 155 are disposed, the plurality of spacers 170 are at least disposed along two side boundaries of the foldable display region 113, orthographic projections of the plurality of spacers 170 on the flexible OLED display substrate 110 fall into the first planar display region 111 and the second planar display region 115, and orthographic projections of the plurality of spacers 170 on the flexible OLED display substrate 110 are at least located at edges of the first planar display region 111 and the second planar display region 115, which are close to the foldable display region 113.
By providing a plurality of spacers 170 on both sides of the foldable display region 113, it is possible to help further distinguish the foldable display region 113 from the flat display regions (the first flat display region 111, the second flat display region 115), and creep of the flat display region during folding can be further reduced by the plurality of spacers 170.
Compared with the prior art, the flexible OLED display panel and the manufacturing method thereof provided in this embodiment can reduce the folding line of the folding area caused by the existing OCA dry film process by arranging the colloid layer with different elastic modulus between the flexible OLED display substrate and the flexible cover plate, and improve the service life of the flexible display device
Finally, it should be noted that: in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The system or the device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A flexible OLED display panel, comprising:
the flexible OLED display substrate comprises a first plane display area, a foldable display area and a second plane display area which are sequentially and adjacently arranged;
the flexible cover plate is arranged on the flexible OLED display substrate; and
a gel layer disposed between the flexible OLED display substrate and the flexible cover sheet configured to bond the flexible OLED display substrate and the flexible cover sheet,
the colloid layer comprises a first colloid layer, a second colloid layer and a third colloid layer, orthographic projections of the first colloid layer, the second colloid layer and the third colloid layer on the flexible OLED display substrate respectively fall into the first plane display area, the foldable display area and the second plane display area, and the elastic modulus of the second colloid layer is lower than that of the first colloid layer and the third colloid layer.
2. The flexible OLED display panel of claim 1, wherein the first, second, and third glue layers are formed on the flexible OLED display substrate by inkjet printing.
3. The flexible OLED display panel of claim 2, wherein the inkjet formation height of the second glue layer is greater than the inkjet formation height of the first and third glue layers.
4. The flexible OLED display panel of any one of claims 1-3, wherein the flexible OLED display panel further includes:
the spacers are arranged between the flexible OLED display substrate and the flexible cover plate and at least arranged along two side boundaries of the foldable display area, orthographic projections of the spacers on the flexible OLED display substrate fall into the first plane display area and the second plane display area, and orthographic projections of the spacers on the flexible OLED display substrate are at least located at the edges of the first plane display area and the second plane display area close to the foldable display area.
5. The flexible OLED display panel of claim 4, wherein the plurality of spacers are disposed at intervals along the edges of the first and second flat display regions, and the plurality of spacers are arranged at a greater density at the boundaries of both sides of the foldable display region than at other positions.
6. The flexible OLED display panel of any one of claims 1-3, wherein the first and third glue layers are both the same material and same modulus of elasticity.
7. The flexible OLED display panel of any one of claims 1-3, wherein the second glue layer has a modulus of elasticity that is at least 0.5Gpa less than the modulus of elasticity of the first and third glue layers.
8. A method of manufacturing a flexible OLED display panel, the method comprising:
providing a flexible OLED display substrate and a flexible cover plate, wherein the flexible OLED display substrate comprises a first plane display area, a foldable display area and a second plane display area which are sequentially and adjacently arranged;
respectively forming a first colloid layer, a second colloid layer and a third colloid layer in a first plane display area, a foldable display area and a second plane display area of the flexible OLED display substrate, wherein the elastic modulus of the second colloid layer is lower than that of the first colloid layer and that of the third colloid layer; and
and attaching the flexible cover plate to one side of the flexible OLED display substrate, which is provided with the first colloid layer, the second colloid layer and the third colloid layer.
9. The manufacturing method of claim 8, wherein forming a first gel, a second gel, and a third gel in the first planar display area, the foldable display area, and the second planar display area of the flexible OLED display substrate, respectively, comprises:
and respectively forming a first colloid, a second colloid and a third colloid in a first plane display area, a foldable display area and a second plane display area of the flexible OLED display substrate in an ink-jet printing mode, wherein the ink-jet forming height of the second colloid layer is greater than the ink-jet forming height of the first colloid layer and the ink-jet forming height of the third colloid layer.
10. The manufacturing method according to claim 8, wherein before the attaching the flexible cover sheet to the side of the flexible OLED display substrate where the first glue, the second glue and the third glue are disposed, the manufacturing method further comprises:
forming a plurality of spacers on a face of the flexible cover plate to be attached to the flexible OLED display substrate,
when the flexible cover plate is attached to one side of the flexible OLED display substrate, which is provided with the first colloid, the second colloid and the third colloid, the plurality of spacers are arranged along the boundaries of two sides of the foldable display area at least, the orthographic projections of the plurality of spacers on the flexible OLED display substrate fall into the first plane display area and the second plane display area, and the orthographic projections of the plurality of spacers on the flexible OLED display substrate are at least positioned at the edges of the first plane display area and the second plane display area, which are close to the foldable display area.
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140014960A1 (en) * | 2012-07-12 | 2014-01-16 | Semiconductor Energy Laboratory Co., Ltd. | Display Device and Method for Manufacturing Display Device |
| US20160338219A1 (en) * | 2015-05-11 | 2016-11-17 | Samsung Display Co., Ltd. | Flexible display device |
| CN110211495A (en) * | 2019-05-29 | 2019-09-06 | 武汉天马微电子有限公司 | A kind of flexible display panels and flexible display apparatus |
| CN110264888A (en) * | 2019-07-02 | 2019-09-20 | 京东方科技集团股份有限公司 | Notacoria structure, display panel and display device |
| CN210181961U (en) * | 2019-09-27 | 2020-03-24 | 昆山工研院新型平板显示技术中心有限公司 | Display panel and display device |
| US20200234616A1 (en) * | 2019-01-22 | 2020-07-23 | Samsung Display Co., Ltd. | Foldable display device |
| US20210157367A1 (en) * | 2019-11-22 | 2021-05-27 | Innolux Corporation | Foldable display device |
| US20210288286A1 (en) * | 2018-08-02 | 2021-09-16 | Sharp Kabushiki Kaisha | Display device and method of manufacturing same |
| US20220006044A1 (en) * | 2018-12-18 | 2022-01-06 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Optical adhesive and display panel |
| US20220141967A1 (en) * | 2019-07-30 | 2022-05-05 | Boe Technology Group Co., Ltd. | Backboard Support Structure, Preparation Method Therefor, and the Display Device |
| CN115294873A (en) * | 2022-08-26 | 2022-11-04 | 科迪华显示技术(绍兴)有限公司 | Foldable display panel and method of manufacturing the same |
-
2023
- 2023-02-22 CN CN202310148334.2A patent/CN115843207B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140014960A1 (en) * | 2012-07-12 | 2014-01-16 | Semiconductor Energy Laboratory Co., Ltd. | Display Device and Method for Manufacturing Display Device |
| US20160338219A1 (en) * | 2015-05-11 | 2016-11-17 | Samsung Display Co., Ltd. | Flexible display device |
| US20210288286A1 (en) * | 2018-08-02 | 2021-09-16 | Sharp Kabushiki Kaisha | Display device and method of manufacturing same |
| US20220006044A1 (en) * | 2018-12-18 | 2022-01-06 | Wuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd. | Optical adhesive and display panel |
| US20200234616A1 (en) * | 2019-01-22 | 2020-07-23 | Samsung Display Co., Ltd. | Foldable display device |
| CN110211495A (en) * | 2019-05-29 | 2019-09-06 | 武汉天马微电子有限公司 | A kind of flexible display panels and flexible display apparatus |
| CN110264888A (en) * | 2019-07-02 | 2019-09-20 | 京东方科技集团股份有限公司 | Notacoria structure, display panel and display device |
| US20220141967A1 (en) * | 2019-07-30 | 2022-05-05 | Boe Technology Group Co., Ltd. | Backboard Support Structure, Preparation Method Therefor, and the Display Device |
| CN210181961U (en) * | 2019-09-27 | 2020-03-24 | 昆山工研院新型平板显示技术中心有限公司 | Display panel and display device |
| US20210157367A1 (en) * | 2019-11-22 | 2021-05-27 | Innolux Corporation | Foldable display device |
| CN115294873A (en) * | 2022-08-26 | 2022-11-04 | 科迪华显示技术(绍兴)有限公司 | Foldable display panel and method of manufacturing the same |
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|---|---|
| CN115843207B (en) | 2024-03-22 |
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