CN115843207B - Flexible OLED display panel and manufacturing method thereof - Google Patents
Flexible OLED display panel and manufacturing method thereof Download PDFInfo
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- CN115843207B CN115843207B CN202310148334.2A CN202310148334A CN115843207B CN 115843207 B CN115843207 B CN 115843207B CN 202310148334 A CN202310148334 A CN 202310148334A CN 115843207 B CN115843207 B CN 115843207B
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- 238000000034 method Methods 0.000 claims description 13
- 238000007641 inkjet printing Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 8
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
Abstract
The invention provides a flexible OLED display panel and a manufacturing method thereof, wherein the flexible OLED display panel comprises a first planar display area, a foldable display area and a second planar 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 the first colloid layer, the second colloid layer and the third colloid layer of the colloid layer on the flexible OLED display substrate fall into the first plane display area, the foldable display area and the second plane display area respectively, and the elastic modulus of the second colloid layer is lower than that of the first colloid layer and the third colloid layer. The invention can reduce crease of folding area of flexible display device, and prolong 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 increasingly used in recent years, and thus, the flexible display has been greatly advanced from the size of a screen to the quality of display. In the assembly process of the flexible OLED display substrate and the flexible cover plate of the conventional flexible display, a OCA (Optical Clear Adhesive) dry film is arranged on the joint surface of the flexible OLED display substrate and the flexible cover plate, the OCA dry film is thicker and has technical defects, and after repeated folding, folds are inevitably generated in the folding area of the OCA dry film, so that the service life of the flexible display device is influenced.
Disclosure of Invention
The invention aims to provide a flexible OLED display panel and a manufacturing method thereof, which can avoid crease caused by repeated folding of a folding area. The specific scheme is as follows:
according to a first aspect of the present invention, there is provided 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
the colloid layer is arranged between the flexible OLED display substrate and the flexible cover plate and is configured to bond the flexible OLED display substrate and the flexible cover plate,
the plastic layer comprises a first plastic layer, a second plastic layer and a third plastic layer, orthographic projections of the first plastic layer, the second plastic layer and the third plastic layer on the flexible OLED display substrate fall into the first plane display area, the foldable display area and the second plane display area respectively, and the elastic modulus of the second plastic layer is lower than that of the first plastic layer and the third plastic layer.
Optionally, the first colloid layer, the second colloid layer and the third colloid layer are formed on the flexible OLED display substrate by using an inkjet printing method.
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, the spacers are at least arranged along the boundaries of two sides of the foldable display area, the orthographic projection of the spacers on the flexible OLED display substrate falls into the first plane display area and the second plane display area, and the orthographic projection of the spacers on the flexible OLED display substrate is 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.
Optionally, the plurality of spacers are circumferentially spaced along edges of the first and second flat display areas, and the arrangement density of the plurality of spacers at two side boundaries of the foldable display area is greater than the arrangement density 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 second gel layer has an elastic modulus that is at least 0.5Gpa less than the elastic modulus of the first and third gel 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 planar display area, a foldable display area and a second planar display area which are sequentially and adjacently arranged;
forming a first colloid layer, a second colloid layer and a third colloid layer respectively 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 the third colloid layer; and
and attaching the flexible cover plate to one side of the flexible OLED display substrate, wherein the side is provided with the first colloid layer, the second colloid layer and the third colloid layer.
Optionally, forming the first colloid, the second colloid, and the third colloid in the first plane display area, the foldable display area, and the second plane display area of the flexible OLED display substrate includes:
and respectively forming a first colloid, a second colloid and a third colloid in the first plane display area, the foldable display area and the second plane display area of the flexible OLED display substrate by adopting an ink-jet printing mode, wherein the ink-jet forming height of the second colloid layer is larger than that of the first colloid layer and the third colloid layer.
Optionally, before the attaching the flexible cover plate to the side of the flexible OLED display substrate where the first colloid, the second colloid, and the third colloid are disposed, the manufacturing method further includes:
forming a plurality of spacers on the surface 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, on which the first colloid, the second colloid and the third colloid are arranged, the spacers are arranged at least along the boundaries of two sides of the foldable display area, the orthographic projection of the spacers on the flexible OLED display substrate falls into the first plane display area and the second plane display area, and the orthographic projection of the spacers on the flexible OLED display substrate is at least located 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 glue layers with different elastic moduli are arranged between the flexible OLED display substrate and the flexible cover plate, so that folds 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 evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:
fig. 1 schematically shows a schematic cross-sectional structure of a flexible OLED display panel according to an embodiment of the present invention;
fig. 2 schematically shows a schematic cross-sectional structure of a flexible OLED display substrate in a flexible OLED display panel according to an embodiment of the present invention;
FIG. 3 schematically illustrates a flexible OLED display panel according to an embodiment of the present invention in a folded state and an unfolded state;
FIG. 4 schematically illustrates a spacer disposed on a flexible OLED display panel according to an embodiment of the present invention;
FIG. 5 schematically illustrates 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 schematic cross-sectional structure of the flexible OLED display panel corresponding to each step in fig. 5.
The reference numerals are expressed as:
100. a flexible OLED display panel; 110. a flexible OLED display substrate; 111. a first flat display area; 113. a foldable display area; 115. a second planar display area; 1101. a display substrate; 1103. displaying a functional layer; 11031. a driving circuit layer; 11032. a first electrode layer; 11033. a light-emitting functional layer; 11034. a second electrode layer; 11035 a protective layer; 130. a flexible cover plate; 150. a colloid layer; 151. a first gel layer; 153. a second gel layer; 155. a third gel layer; 170. a spacer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the 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 this application 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, the "plurality" generally includes at least two.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present invention, these terms should not be limited to these terms.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product 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 product or apparatus. Without further limitation, an element defined by the phrase "comprising" does not exclude the presence of other like elements in a commodity or device comprising such element.
Alternative embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Fig. 1 schematically illustrates a schematic cross-sectional structure of a flexible OLED display panel provided by an embodiment of the present invention, referring to fig. 1, according to a specific embodiment of the present invention, a flexible OLED display panel 100 is provided, including a flexible OLED display substrate 110, a flexible cover plate 130, and a glue layer 150, where the flexible cover plate 130 is disposed on the flexible OLED display substrate 110, and the glue 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.
Fig. 2 schematically illustrates a schematic cross-sectional structure of a flexible OLED display substrate in a flexible OLED display panel provided by an embodiment of the present invention, referring to fig. 2, the flexible OLED display substrate 110 is a main display structure of the flexible OLED display panel 100, and generally includes a display substrate 1101 and a display functional layer 1103 forming the display structure formed on the display substrate, where the display substrate 1101 is, for example, a PI substrate, and the display functional layer 1103 includes, for example, a driving circuit layer 11031, a first electrode layer 11032, a light emitting functional layer 11033, a second electrode layer 11034, and a protective layer 11035 sequentially disposed on the display substrate 1101. The driving circuit layer 11031 includes OLED driving circuits arranged in an array, and supplies driving voltages to OLED devices of the respective pixels. 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 constitute an array arrangement OLED device, and the light-emitting functional layer 11035 includes, for example, an electron-emitting layer, an electron-transporting layer, a light-emitting layer, a hole-transporting layer, and a hole-emitting layer, which are stacked in this order. The protective layer 11035 includes, for example, a multilayer organic/inorganic stacked structure alternately arranged 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 polarizing layer, etc., where the foregoing functional layers do not necessarily exist at the same time, and specific positions may also be adjusted according to actual needs, and fig. 2 only schematically shows a part of the functional layers of the foregoing display substrate and examples.
The flexible OLED display substrate 110 includes at least one foldable display area 113, and a display substrate of the foldable display area 113 may be made of a flexible material that is bendable such as plastic, and the flexible display substrate is formed with various film layers that form a display structure, including but not limited to: the light emitting layer, the touch layer, the polarizing layer, etc. each of the film layers constituting the display structure is also a flexible film layer made of a flexible material, so that the foldable display area 113 may be deformed, e.g., bent, folded, etc., by a force.
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 that are sequentially and adjacently arranged. The foldable display area 113 is a flexible display structure capable of being deformed by a force, and the first and second flat display areas 111 and 115 are rigid display structures, and are not deformed even if a certain external force is applied.
Fig. 3 schematically illustrates a flexible OLED display panel provided in 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 may 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 presents a curved surface; the flexible OLED display panel 100, when in an unfolded state, the foldable display area 113 appears planar and is substantially coplanar with the first and second planar display areas 111, 115.
In some embodiments, the flexible OLED display substrate 110 may be folded in half along the 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 in half along a central axis of the rectangular area when folded.
The flexible cover 130 is disposed on the flexible OLED display substrate 110, and is generally located at the uppermost layer of the flexible OLED display panel 100. The flexible cover 130 is made of a transparent material, and may be one or more of glass, silicon nitride, silicon oxide, aluminum oxide, plastic PI, and PET.
The glue 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 flat display area (including the first flat display area 111 and the second flat display area 115) of the flexible OLED display substrate 110 respectively correspond to the colloid layers with different elastic moduli. Wherein the elastic modulus of the foldable display region 113 is lower than that of the flat display region.
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 that are sequentially and adjacently arranged. Accordingly, the gel layers include a first gel layer 151, a second gel layer 153, and a third gel layer 155. The orthographic projections of the first, second and third colloid layers 151, 153, 155 on the flexible OLED display substrate 110 fall into the first, foldable and second plane display areas 111, 113, 115, respectively. The second gel layer 153 has a lower elastic modulus than the first and third gel layers 151 and 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 using an inkjet printing method. The ink-jet printing mode can be specifically realized by spraying 111 corresponding liquid adhesives (Liquid Optical Clear Adhesive, LOCA) on corresponding positions of the bonding surface of the flexible OLED display substrate 110 by a printer. Compared with the conventional method that the OCA dry film is directly arranged on the bonding 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 bonding surface of the flexible OLED display substrate 110.
In some embodiments, the liquid adhesive may be one or a mixture of several of epoxy, acryl, silicone rubber, etc.
In some embodiments, the second gel layer 153 has a lower elastic modulus than the first and third gel layers 151 and 155, and the first and third gel layers 151 and 155 have the same elastic modulus. In some embodiments, the elastic modulus of the second gel layer 153 is at least 0.5Gpa less than the elastic modulus of the first and third gel layers 151, 155. By providing a glue layer with a lower modulus of elasticity in the foldable display area, this area can be made more flexible.
In some embodiments, the inkjet formation height of the second gel layer 153 is greater than the inkjet formation height of the first and third gel layers 151 and 155.
In some embodiments, the liquid adhesive L1 is ink-jet printed in the first and second planar display areas 111, 115 of the flexible OLED display substrate 110, and the ink-jet formation height is H1; the liquid adhesive L2 is ink-jet printed in the foldable display area 113 of the flexible OLED display substrate 110, and the ink-jet formation height is H2. Wherein, the colloid viscosities of L1 and L2 are basically the same (the colloid viscosity range can be 0-15 cP), the elastic modulus of L2 is smaller than that of L1, and H2 is larger than H1. By arranging the glue layer with smaller elastic modulus and higher thickness in the foldable display area, the area has better flexibility, and can be better restored to the original state, so that folds are avoided or reduced.
By ink-jet printing two different liquid adhesives in different areas of the flexible OLED display substrate 110 and forming different thicknesses, stability of the flexible folding screen after frequent folding can be optimized, and it is ensured that the flexible folding screen still maintains crease-free display and use effects after frequent folding.
Fig. 4 schematically illustrates a spacer disposed on a flexible OLED display panel according to 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 are disposed between the flexible OLED display substrate 110 and the flexible cover plate 130. The spacers 170 are disposed at least along two side boundaries of the foldable display area 113, the front projections of the spacers 170 on the flexible OLED display substrate 110 fall into the first plane display area 111 and the second plane display area 115, and the front projections of the spacers 170 on the flexible OLED display substrate 110 are at least located at the edges of the first plane display area 111 and the second plane display area 115 near the foldable display area 113.
By providing a plurality of spacers 170 on both sides of the foldable display region 113, it is possible to further distinguish the foldable display region 113 from the flat display region (the first flat display region 111, the second flat display region 115), and by isolating the second colloid layer 153 from the first colloid layer 151 and the third colloid layer 155 by the plurality of spacers 170, the flow of the second colloid layer 153 from the first colloid layer 151 and the third colloid layer 155 at the junctions can be avoided, and creep of the foldable display region 113 during folding can be reduced.
In some embodiments, the plurality of spacers 170 are circumferentially spaced along edges of the first and second flat display regions 111 and 115 to ensure uniform spacing between the flexible OLED display substrate 110 and the flexible cover plate 130.
In some embodiments, the plurality of spacers 170 are arranged at a greater density at the boundaries of both sides of the foldable display region 113 than at other locations. The division may be further divided by the above arrangement, reducing creep of the foldable display area 113.
FIG. 5 schematically illustrates 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 schematic cross-sectional structure of the flexible OLED display panel corresponding to each step in fig. 5. Referring to fig. 5 and fig. 6 together, the present invention further provides a method for manufacturing a flexible OLED display panel, which includes:
step S10, providing a flexible OLED display substrate 110 and a flexible cover plate 130, where the flexible OLED display substrate 110 includes a first planar display area 111, a foldable display area 113, and a second planar display area 115 that 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 polarizing layer, etc., which constitute the display structure, formed on the display substrate.
The display substrate of the foldable display area 113 may be made of a bendable flexible material such as plastic, and various film layers constituting the display structure are formed on the flexible display substrate, including but not limited to: the color film layer, the touch layer, the polarizing layer, etc. each film layer forming the display structure is also a flexible film layer made of a flexible material, so that the foldable display area 113 can be deformed, e.g. bent, folded, etc., under the action of force. The first and second flat display regions 111 and 115 are rigid display structures, and are not deformed 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, 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, the first, second and third colloid layers 151, 153 and 155 are formed in the first, foldable and second flat display areas 111, 113 and 115 of the flexible OLED display substrate 110, respectively, and the first, second and third colloid layers 151, 153 and 155 may be formed in the first, foldable and second flat display areas 111, 113 and 115 of the flexible OLED display substrate 110 by 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 using an inkjet printing method. The ink-jet printing mode can be specifically realized by spraying corresponding liquid adhesives (Liquid Optical Clear Adhesive, LOCA) on corresponding positions of the bonding surface of the flexible OLED display substrate 110 through a printer. Compared with the conventional method that the OCA dry film is directly arranged on the bonding 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 bonding surface of the flexible OLED display substrate 110. And the LOCA is adopted, so that the technical defects brought by the existing OCA dry film technology, such as bubbles, substrate breakage, folds in a folding area and the like, can be reduced, the thickness of the colloid layer can be further accurately controlled, the thickness of the colloid layer can be reduced to be less than 10 mu, and the size of the flexible electronic product is further reduced.
In some embodiments, the liquid adhesive may be one or a mixture of several of epoxy, acryl, silicone rubber, etc.
In some embodiments, the first gel layer 151 and the third gel layer 155 have the same modulus of elasticity. In some embodiments, the elastic modulus of the second gel layer 153 is at least 0.5Gpa less than the elastic modulus of the first and third gel layers 151, 155.
In some embodiments, the inkjet formation height of the second gel layer 153 is greater than the inkjet formation height of the first and third gel layers 151 and 155.
In some embodiments, the liquid adhesive L1 is ink-jet printed in the first and second planar display areas 111, 115 of the flexible OLED display substrate 110, and the ink-jet formation height is H1; the liquid adhesive L2 is ink-jet printed in the foldable display area 113 of the flexible OLED display substrate 110, and the ink-jet formation height is H2. Wherein, the colloid viscosities of L1 and L2 are the same (the colloid viscosity can be in the range of 0-15 cP), and the elastic modulus of L2 is less than the elastic modulus 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, stability of the flexible folding screen after frequent folding can be optimized, and it is ensured that the flexible folding screen still maintains crease-free display and use effects after frequent folding.
In step S30, the flexible cover 130 is attached to the side of the flexible OLED display substrate 110 where the first, second and third glue layers 151, 153, 155 are disposed.
In some embodiments, before the attaching the flexible cover plate 130 to the side of the flexible OLED display substrate 110 where the first, second, and third gel layers 151, 153, 155 are disposed, the manufacturing method further includes: after the flexible cover 130 is attached to the 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 on the flexible cover 130, the spacers 170 are disposed at least along two side boundaries of the foldable display area 113, the front projections of the spacers 170 on the flexible OLED display substrate 110 fall into the first plane display area 111 and the second plane display area 115, and the front projections of the spacers 170 on the flexible OLED display substrate 110 are at least located at the edges of the first plane display area 111 and the second plane display area 115 near the foldable display area 113.
By providing a plurality of spacers 170 on both sides of the foldable display region 113, it is possible to facilitate further distinguishing between the foldable display region 113 and the flat display regions (the first flat display region 111, the second flat display region 115), and creep of the flat display regions 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 by the embodiment can reduce folds of a folding area caused by the conventional OCA dry film process and improve the service life of a flexible display device by arranging the colloid layers with different elastic moduli between the flexible OLED display substrate and the flexible cover plate
Finally, it should be noted that: in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. The system or the device disclosed in the embodiments are relatively simple in description, and the relevant points refer to the description of the method section because the system or the device corresponds to the method disclosed in the embodiments.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
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
the colloid layer is arranged between the flexible OLED display substrate and the flexible cover plate and is configured to bond the flexible OLED display substrate and the flexible cover plate,
wherein the colloid layer comprises a first colloid layer, a second colloid layer and a third colloid layer, the 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, the elastic modulus of the second colloid layer is lower than the elastic modulus of the first colloid layer and the third colloid layer,
the forming height of the second colloid layer is larger than that of the first colloid layer and the third colloid layer, the flexible cover plate is attached to one side of the flexible OLED display substrate, on which the first colloid layer, the second colloid layer and the third colloid layer are arranged, the first colloid layer, the second colloid layer and the third colloid layer have the same box-to-box height so as to ensure that the interval between the flexible OLED display substrate and the flexible cover plate is uniform,
the flexible OLED display panel further includes:
a plurality of spacers arranged between the flexible OLED display substrate and the flexible cover plate, wherein the spacers are arranged at least along the boundaries of two sides of the foldable display area, the orthographic projection of the spacers on the flexible OLED display substrate falls into the first plane display area and the second plane display area, the orthographic projection of the spacers on the flexible OLED display substrate is at least positioned at the edges of the first plane display area and the second plane display area close to the foldable display area,
the spacers are circumferentially arranged at intervals along the edges of the first plane display area and the second plane display area, and the arrangement density of the spacers at the boundaries of two sides of the foldable display area is greater than that at other positions.
2. The flexible OLED display panel of claim 1, wherein the first, second, and third gel layers are formed on the flexible OLED display substrate using inkjet printing.
3. The flexible OLED display panel of any one of claims 1-2, wherein the material and elastic modulus of the first and third gel layers are the same.
4. The flexible OLED display panel of any one of claims 1-2, wherein the second gel layer has a modulus of elasticity that is at least 0.5Gpa less than the modulus of elasticity of the first and third gel layers.
5. 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 planar display area, a foldable display area and a second planar display area which are sequentially and adjacently arranged;
forming a first colloid layer, a second colloid layer and a third colloid layer respectively 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 the third colloid layer, and the forming height of the second colloid layer is larger than that of the first colloid layer and the third colloid layer; and
attaching the flexible cover plate to one side of the flexible OLED display substrate provided with the first colloid layer, the second colloid layer and the third colloid layer, wherein the first colloid layer, the second colloid layer and the third colloid layer have the same box-to-box height so as to ensure that the distance between the flexible OLED display substrate and the flexible cover plate is uniform,
before the flexible cover plate is attached to one side of the flexible OLED display substrate where the first colloid, the second colloid and the third colloid are disposed, the manufacturing method further includes:
forming a plurality of spacers on the surface 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, on which the first colloid, the second colloid and the third colloid are arranged, the spacers are arranged at least along the boundaries of two sides of the foldable display area, the orthographic projections of the spacers on the flexible OLED display substrate fall into the first plane display area and the second plane display area, the orthographic projections of the 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 close to the foldable display area,
the spacers are circumferentially arranged at intervals along the edges of the first plane display area and the second plane display area, and the arrangement density of the spacers at the boundaries of two sides of the foldable display area is greater than that at other positions.
6. The manufacturing method of claim 5, wherein forming the first, second and third colloids in the first, foldable and second planar display regions of the flexible OLED display substrate comprises:
and forming a first colloid, a second colloid and a third colloid on the first plane display area, the foldable display area and the second plane display area of the flexible OLED display substrate by adopting an ink-jet printing mode.
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